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1. Pharmacological activation of constitutive androstane receptor induces female-specific modulation of hepatic metabolism

Author: Marine Huillet, Frédéric Lasserre, Marie-Pierre Gratacap, Beatrice Engelmann, Justine Bruse, Arnaud Polizzi, Tiffany Fougeray, Céline Marie Pauline Martin, Clémence Rives, Anne Fougerat, Claire Naylies, Yannick Lippi, Géraldine Garcia, Elodie Rousseau-Bacquie, Cécile Canlet, Laurent Debrauwer, Ulrike Rolle-Kampczyk, Martin von Bergen, Bernard Payrastre, Elisa Boutet-Robinet, Laurence Gamet-Payrastre, Hervé Guillou, Nicolas Loiseau, and Sandrine Ellero-Simatos
Subjects: Sexual dimorphism, Hepatic xenobiotic metabolism, Lipoprotein metabolism, Platelet aggregation, Trimethylamine-N-oxide, Diseases of the digestive system. Gastroenterology, RC799-869
Abstract: Background & Aims: The constitutive androstane receptor (CAR) is a nuclear receptor that binds diverse xenobiotics and whose activation leads to the modulation of the expression of target genes involved in xenobiotic detoxification and energy metabolism. Although CAR hepatic activity is considered to be higher in women than in men, its sex-dependent response to an acute pharmacological activation has seldom been investigated. Methods: The hepatic transcriptome, plasma markers, and hepatic metabolome, were analysed in Car+/+ and Car-/- male and female mice treated either with the CAR-specific agonist 1,4-bis[2-(3,5-dichloropyridyloxy)]benzene (TCPOBOP) or with vehicle. Results: Although 90% of TCPOBOP-sensitive genes were modulated in a sex-independent manner, the remaining 10% showed almost exclusive female liver specificity. These female-specific CAR-sensitive genes were mainly involved in xenobiotic metabolism, inflammation, and extracellular matrix organisation. CAR activation also induced higher hepatic oxidative stress and hepatocyte cytolysis in females than in males. Hepatic expression of flavin monooxygenase 3 (Fmo3) was almost abolished and was associated with a decrease in hepatic trimethylamine-N-oxide (TMAO) concentration in TCPOBOP-treated females. In line with a potential role in the control of TMAO homeostasis, CAR activation decreased platelet hyper-responsiveness in female mice supplemented with dietary choline. Conclusions: More than 10% of CAR-sensitive genes are sex-specific and influence hepatic and systemic responses such as platelet aggregation. CAR activation may be an important mechanism of sexually-dimorphic drug-induced liver injury. Impact and implications: CAR is activated by many drugs and pollutants. Its pharmacological activation had a stronger impact on hepatic gene expression and metabolism in females than in males, and had a specific impact on liver toxicity and trimethylamine metabolism. Sexual dimorphism should be considered when testing and/or prescribing xenobiotics known to activate CAR.
Published: 2024
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2. Intestinal Pgc1α ablation protects from liver steatosis and fibrosis

Author: Elena Piccinin, Maria Arconzo, Maria Laura Matrella, Marica Cariello, Arnaud Polizzi, Yannick Lippi, Justine Bertrand-Michel, Hervé Guillou, Nicolas Loiseau, Gaetano Villani, and Antonio Moschetta
Subjects: Metabolic dysfunction-associated steatotic liver disease, Metabolic dysfunction-associated steatohepatitis, Gut–liver axis, Cholesterol, Peroxisome proliferator-activated receptor-gamma coactivator 1α, NAFLD, Diseases of the digestive system. Gastroenterology, RC799-869
Abstract: Background & Aims: The gut–liver axis modulates the progression of metabolic dysfunction-associated steatotic liver disease (MASLD), a spectrum of conditions characterised by hepatic steatosis and a progressive increase of inflammation and fibrosis, culminating in metabolic dysfunction-associated steatohepatitis. Peroxisome proliferator-activated receptor-gamma coactivator 1α (Pgc1α) is a transcriptional co-regulator of mitochondrial activity and lipid metabolism. Here, the intestinal-specific role of Pgc1α was analysed in liver steatosis and fibrosis. Methods: We used a mouse model in which Pgc1α was selectively deleted from the intestinal epithelium. We fed these mice and their wild-type littermates a Western diet to recapitulate the major features of liver steatosis (after 2 months of diet) and metabolic dysfunction-associated steatohepatitis (after 4 months of diet). The chow diet was administered as a control diet. Results: In humans and mice, low expression of intestinal Pgc1α is inversely associated with liver steatosis, inflammation, and fibrosis. Intestinal disruption of Pgc1α impairs the transcription of a wide number of genes, including the cholesterol transporter Niemann–Pick C1-like 1 (Npc1l1), thus limiting the uptake of cholesterol from the gut. This results in a lower cholesterol accretion in the liver and a decreased production of new fatty acids, which protect the liver from lipotoxic lipid species accumulation, inflammation, and related fibrotic processes. Conclusions: In humans and mice, intestinal Pgc1α induction during Western diet may be another culprit driving hepatic steatosis and fibrosis. Here, we show that enterocyte-specific Pgc1α ablation protects the liver from steatosis and fibrosis by reducing intestinal cholesterol absorption, with subsequent decrease of cholesterol and de novo fatty acid accumulation in the liver. Impact and implications: Liver diseases result from several insults, including signals from the gut. Although the incidence of liver diseases is continuously increasing worldwide, effective drug therapy is still lacking. Here, we showed that the modulation of an intestinal coactivator regulates the liver response to a Western diet, by limiting the uptake of dietary cholesterol. This results in a lower accumulation of hepatic lipids together with decreased inflammation and fibrosis, thus limiting the progression of liver steatosis and fibrosis towards severe end-stage diseases.
Published: 2023
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3. CAR Protects Females from Diet-Induced Steatosis and Associated Metabolic Disorders

Author: Fabiana Oliviero, Wendy Klement, Lucile Mary, Yannick Dauwe, Yannick Lippi, Claire Naylies, Véronique Gayrard, Nicola Marchi, and Laila Mselli-Lakhal
Subjects: NAFLD, sexual dimorphism, constitutive androstane receptor, high-fat diet, Cytology, QH573-671
Abstract: Non-Alcoholic Fatty Liver Disease (NAFLD) is the most common cause of chronic liver disease worldwide, affecting 70–90% of obese individuals. In humans, a lower NAFLD incidence is reported in pre-menopausal women, although the mechanisms affording this protection remain under-investigated. Here, we tested the hypothesis that the constitutive androstane nuclear receptor (CAR) plays a role in the pathogenesis of experimental NAFLD. Male and female wild-type (WT) and CAR knock-out (CAR−/−) mice were subjected to a high-fat diet (HFD) for 16 weeks. We examined the metabolic phenotype of mice through body weight follow-up, glucose tolerance tests, analysis of plasmatic metabolic markers, hepatic lipid accumulation, and hepatic transcriptome. Finally, we examined the potential impact of HFD and CAR deletion on specific brain regions, focusing on glial cells. HFD-induced weight gain and hepatic steatosis are more pronounced in WT males than females. CAR−/− females present a NASH-like hepatic transcriptomic signature suggesting a potential NAFLD to NASH transition. Transcriptomic correlation analysis highlighted a possible cross-talk between CAR and ERα receptors. The peripheral effects of CAR deletion in female mice were associated with astrogliosis in the hypothalamus. These findings prove that nuclear receptor CAR may be a potential mechanism entry-point and a therapeutic target for treating NAFLD/NASH.
Published: 2023
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4. Effect of Streptomyces roseolus Cell-Free Supernatants on the Fungal Development, Transcriptome, and Aflatoxin B1 Production of Aspergillus flavus

Author: Louise Maud, Florian Boyer, Vanessa Durrieu, Julie Bornot, Yannick Lippi, Claire Naylies, Sophie Lorber, Olivier Puel, Florence Mathieu, and Selma P. Snini
Subjects: Aspergillus flavus, Streptomyces roseolus, cell-free supernatant, biocontrol, aflatoxin B1, transcriptomic analysis, Medicine
Abstract: Crop contamination by aflatoxin B1 (AFB1), an Aspergillus-flavus-produced toxin, is frequently observed in tropical and subtropical regions. This phenomenon is emerging in Europe, most likely as a result of climate change. Alternative methods, such as biocontrol agents (BCAs), are currently being developed to reduce the use of chemicals in the prevention of mycotoxin contamination. Actinobacteria are known to produce many bioactive compounds, and some of them can reduce in vitro AFB1 concentration. In this context, the present study aims to analyze the effect of a cell-free supernatant (CFS) from Streptomyces roseolus culture on the development of A. flavus, as well as on its transcriptome profile using microarray assay and its impact on AFB1 concentration. Results demonstrated that in vitro, the S. roseolus CFS reduced the dry weight and conidiation of A. flavus from 77% and 43%, respectively, and was therefore associated with a reduction in AFB1 concentration reduction to levels under the limit of quantification. The transcriptomic data analysis revealed that 5198 genes were differentially expressed in response to the CFS exposure and among them 5169 were downregulated including most of the genes involved in biosynthetic gene clusters. The aflatoxins’ gene cluster was the most downregulated. Other gene clusters, such as the aspergillic acid, aspirochlorine, and ustiloxin B gene clusters, were also downregulated and associated with a variation in their concentration, confirmed by LC-HRMS.
Published: 2023
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5. The pregnane X receptor drives sexually dimorphic hepatic changes in lipid and xenobiotic metabolism in response to gut microbiota in mice

Author: Sharon Ann Barretto, Frederic Lasserre, Marine Huillet, Marion Régnier, Arnaud Polizzi, Yannick Lippi, Anne Fougerat, Elodie Person, Sandrine Bruel, Colette Bétoulières, Claire Naylies, Céline Lukowicz, Sarra Smati, Laurence Guzylack, Maïwenn Olier, Vassilia Théodorou, Laila Mselli-Lakhal, Daniel Zalko, Walter Wahli, Nicolas Loiseau, Laurence Gamet-Payrastre, Hervé Guillou, and Sandrine Ellero-Simatos
Subjects: Gut microbiota, Liver, Pregnane X receptor, NR1I2, Xenobiotic metabolism, Fatty acid metabolism, Microbial ecology, QR100-130
Abstract: Abstract Background The gut microbiota–intestine–liver relationship is emerging as an important factor in multiple hepatic pathologies, but the hepatic sensors and effectors of microbial signals are not well defined. Results By comparing publicly available liver transcriptomics data from conventional vs. germ-free mice, we identified pregnane X receptor (PXR, NR1I2) transcriptional activity as strongly affected by the absence of gut microbes. Microbiota depletion using antibiotics in Pxr +/+ vs Pxr -/- C57BL/6J littermate mice followed by hepatic transcriptomics revealed that most microbiota-sensitive genes were PXR-dependent in the liver in males, but not in females. Pathway enrichment analysis suggested that microbiota–PXR interaction controlled fatty acid and xenobiotic metabolism. We confirmed that antibiotic treatment reduced liver triglyceride content and hampered xenobiotic metabolism in the liver from Pxr +/+ but not Pxr -/- male mice. Conclusions These findings identify PXR as a hepatic effector of microbiota-derived signals that regulate the host’s sexually dimorphic lipid and xenobiotic metabolisms in the liver. Thus, our results reveal a potential new mechanism for unexpected drug–drug or food–drug interactions. Video abstract
Published: 2021
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6. Haem iron reshapes colonic luminal environment: impact on mucosal homeostasis and microbiome through aldehyde formation

Author: Océane C. B. Martin, Maïwenn Olier, Sandrine Ellero-Simatos, Nathalie Naud, Jacques Dupuy, Laurence Huc, Sylviane Taché, Vanessa Graillot, Mathilde Levêque, Valérie Bézirard, Cécile Héliès-Toussaint, Florence Blas Y. Estrada, Valérie Tondereau, Yannick Lippi, Claire Naylies, Lindsey Peyriga, Cécile Canlet, Anne Marie Davila, François Blachier, Laurent Ferrier, Elisa Boutet-Robinet, Françoise Guéraud, Vassilia Théodorou, and Fabrice H. F. Pierre
Subjects: Lipoperoxidation, Barrier function, Metabolites, Dysbiosis, Meat, Microbial ecology, QR100-130
Abstract: Abstract Background The World Health Organization classified processed and red meat consumption as “carcinogenic” and “probably carcinogenic”, respectively, to humans. Haem iron from meat plays a role in the promotion of colorectal cancer in rodent models, in association with enhanced luminal lipoperoxidation and subsequent formation of aldehydes. Here, we investigated the short-term effects of this haem-induced lipoperoxidation on mucosal and luminal gut homeostasis including microbiome in F344 male rats fed with a haem-enriched diet (1.5 μmol/g) 14–21 days. Results Changes in permeability, inflammation, and genotoxicity observed in the mucosal colonic barrier correlated with luminal haem and lipoperoxidation markers. Trapping of luminal haem-induced aldehydes normalised cellular genotoxicity, permeability, and ROS formation on a colon epithelial cell line. Addition of calcium carbonate (2%) to the haem-enriched diet allowed the luminal haem to be trapped in vivo and counteracted these haem-induced physiological traits. Similar covariations of faecal metabolites and bacterial taxa according to haem-induced lipoperoxidation were identified. Conclusions This integrated approach provides an overview of haem-induced modulations of the main actors in the colonic barrier. All alterations were closely linked to haem-induced lipoperoxidation, which is associated with red meat-induced colorectal cancer risk.
Published: 2019
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7. Versicolorin A, a precursor in aflatoxins biosynthesis, is a food contaminant toxic for human intestinal cells

Author: Thierry Gauthier, Carolina Duarte-Hospital, Julien Vignard, Elisa Boutet-Robinet, Michael Sulyok, Selma P. Snini, Imourana Alassane-Kpembi, Yannick Lippi, Sylvie Puel, Isabelle P. Oswald, and Olivier Puel
Subjects: Environmental sciences, GE1-350
Abstract: Aflatoxin B1 (AFB1) is the most potent carcinogen among mycotoxins. Its biosynthesis involves the formation of versicolorin A (VerA), whose chemical structure shares many features with AFB1. Our data revealed significant levels of VerA in foodstuff from Central Asia and Africa. Given this emerging food risk, it was of prime interest to compare the toxic effects of the two mycotoxins against cells originating from the intestinal tract. We used human colon cell lines (Caco-2, HCT116) to investigate the cytotoxic process induced by the two mycotoxins. Contrary to AFB1, a low dose of VerA (1 µM) disturbed the expression level of thousands of genes (18 002 genes). We show that the cytotoxic effects of low doses of VerA (1–20 µM) were stronger than the same low doses of AFB1 in both Caco-2 and HCT116 cell lines. In Caco-2 cells, VerA induced DNA strand breaks that led to apoptosis and reduced DNA replication of dividing cells, consequently inhibiting cell proliferation. Although VerA was able to induce the p53 signaling pathway in p53 wild-type HCT116 cells, its toxicity process did not mainly rely on p53 expression since similar cytotoxic effects were also observed in HCT116 cells that do not express p53. In conclusion, this study provides evidence of the risk of food contamination by VerA and shed light on its toxicological effect on human colon cells. Keywords: Mycotoxins, Versicolorin A, Aflatoxin B1, Human colon cells, Genotoxicity, Cytotoxicity
Published: 2020
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8. Tissular Genomic Responses to Oral FB1 Exposure in Pigs

Author: Léonie Dopavogui, Arnaud Polizzi, Anne Fougerat, Pascal Gourbeyre, Chloé Terciolo, Wendy Klement, Philippe Pinton, Joëlle Laffite, Anne-Marie Cossalter, Jean-Denis Bailly, Olivier Puel, Yannick Lippi, Claire Naylies, Hervé Guillou, Isabelle P. Oswald, and Nicolas Loiseau
Subjects: fumonisin, liver, jejunum, spleen, Peyer’s patches, swine, Medicine
Abstract: Fumonisin B1 (FB1) is a widespread mycotoxin produced by fungal Fusarium species—mainly in maize, one of the plants most commonly used for food and feed. Pigs and horses are the animal species most susceptible to this mycotoxin. FB1 exposure can cause highly diverse clinical symptoms, including hepatotoxicity, immunotoxicity, and intestinal barrier function disturbance. Inhibition of ceramide synthetase is a well-understood ubiquitous molecular mechanism of FB1 toxicity, but other more tissue-specific effects remain to be elucidated. To investigate the effects of FB1 in different exposed tissues, we cross-analyzed the transcriptomes of fours organs: liver, jejunum, jejunal Peyer’s patches, and spleen. During a four-week study period, pigs were fed a control diet or a FB1-contaminated diet (10 mg/kg feed). In response to oral FB1 exposure, we observed common biological processes in the four organs, including predominant and recurrent processes (extracellular matrix organization, integrin activation, granulocyte chemotaxis, neutrophil migration, and lipid and sterol homeostasis), as well as more tissue-specific processes that appeared to be related to lipid outcomes (cell cycle regulation in jejunum, and gluconeogenesis in liver).
Published: 2022
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9. The Solvent Dimethyl Sulfoxide Affects Physiology, Transcriptome and Secondary Metabolism of Aspergillus flavus

Author: Laura H. Costes, Yannick Lippi, Claire Naylies, Emilien L. Jamin, Clémence Genthon, Sylviane Bailly, Isabelle P. Oswald, Jean-Denis Bailly, and Olivier Puel
Subjects: dimethyl sulfoxide, DMSO, Aspergillus flavus, RNA-seq, aflatoxins, ustiloxin B, Biology (General), QH301-705.5
Abstract: Dimethyl sulfoxide (DSMO) is a simple molecule widely used because of its great solvating ability, but this solvent also has little-known biological effects, especially on fungi. Aspergillus flavus is a notorious pathogenic fungus which may contaminate a large variety of crops worldwide by producing aflatoxins, endangering at the same time food safety and international trade. The aim of this study was to characterize the effect of DMSO on A. flavus including developmental parameters such as germination and sporulation, as well as its transcriptome profile using high-throughput RNA-sequencing assay and its impact on secondary metabolism (SM). After DMSO exposure, A. flavus displayed depigmented conidia in a dose-dependent manner. The four-day exposition of cultures to two doses of DMSO, chosen on the basis of depigmentation intensity (35 mM “low” and 282 mM “high”), led to no significant impact on fungal growth, germination or sporulation. However, transcriptomic data analysis showed that 4891 genes were differentially regulated in response to DMSO (46% of studied transcripts). A total of 4650 genes were specifically regulated in response to the highest dose of DMSO, while only 19 genes were modulated upon exposure to the lowest dose. Secondary metabolites clusters genes were widely affected by the DMSO, with 91% of clusters impacted at the highest dose. Among these, aflatoxins, cyclopiazonic acid and ustiloxin B clusters were totally under-expressed. The genes belonging to the AFB1 cluster were the most negatively modulated ones, the two doses leading to 63% and 100% inhibition of the AFB1 production, respectively. The SM analysis also showed the disappearance of ustiloxin B and a 10-fold reduction of cyclopiazonic acid level when A. flavus was treated by the higher DMSO dose. In conclusion, the present study showed that DMSO impacted widely A. flavus’ transcriptome, including secondary metabolism gene clusters with the aflatoxins at the head of down-regulated ones. The solvent also inhibits conidial pigmentation, which could illustrate common regulatory mechanisms between aflatoxins and fungal pigment pathways. Because of its effect on major metabolites synthesis, DMSO should not be used as solvent especially in studies testing anti-aflatoxinogenic compounds.
Published: 2021
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10. Time course study of the response to LPS targeting the pig immune gene networks

Author: Elena Terenina, Valérie Sautron, Caroline Ydier, Darya Bazovkina, Amélie Sevin-Pujol, Laure Gress, Yannick Lippi, Claire Naylies, Yvon Billon, Laurence Liaubet, Pierre Mormede, and Nathalie Villa-Vialaneix
Subjects: Stress, Hypothalamic-pituitary-adrenal (HPA) axis, Cortisol, Time-course, Systems biology, Microarray, Biotechnology, TP248.13-248.65, Genetics, QH426-470
Abstract: Abstract Background Stress is a generic term used to describe non-specific responses of the body to all kinds of challenges. A very large variability in the response can be observed across individuals, depending on numerous conditioning factors like genetics, early influences and life history. As a result, there is a wide range of individual vulnerability and resilience to stress, also called robustness. The importance of robustness-related traits in breeding strategies is increasing progressively towards the production of animals with a high level of production under a wide range of climatic conditions and management systems, together with a lower environmental impact and a high level of animal welfare. The present study aims at describing blood transcriptomic, hormonal, and metabolic responses of pigs to a systemic challenge using lipopolysaccharide (LPS). The objective is to analyze the individual variation of the biological responses in relation to the activity of the HPA axis measured by the levels of plasma cortisol after LPS and ACTH in 120 juvenile Large White (LW) pigs. The kinetics of the response was measured with biological variables and whole blood gene expression at 4 time points. A multilevel statistical analysis was used to take into account the longitudinal aspect of the data. Results Cortisol level reaches its peak 4 h after LPS injection. The characteristic changes of white blood cell count to LPS were observed, with a decrease of total count, maximal at t=+4 h, and the mirror changes in the respective proportions of lymphocytes and granulocytes. The lymphocytes / granulocytes ratio was maximal at t=+1 h. An integrative statistical approach was used and provided a set of candidate genes for kinetic studies and ongoing complementary studies focused on the LPS-stimulated inflammatory response. Conclusions The present study demonstrates the specific biomarkers indicative of an inflammation in swine. Furthermore, these stress responses persist for prolonged periods of time and at significant expression levels, making them good candidate markers for evaluating the efficacy of anti-inflammatory drugs.
Published: 2017
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11. Statistical Integration of ‘Omics Data Increases Biological Knowledge Extracted from Metabolomics Data: Application to Intestinal Exposure to the Mycotoxin Deoxynivalenol

Author: Marie Tremblay-Franco, Cécile Canlet, Philippe Pinton, Yannick Lippi, Roselyne Gautier, Claire Naylies, Manon Neves, Isabelle P. Oswald, Laurent Debrauwer, and Imourana Alassane-Kpembi
Subjects: mycotoxin exposure 1, transcriptomics 2, metabolomics 3, statistical integration 4, Microbiology, QR1-502
Abstract: The effects of low doses of toxicants are often subtle and information extracted from metabolomic data alone may not always be sufficient. As end products of enzymatic reactions, metabolites represent the final phenotypic expression of an organism and can also reflect gene expression changes caused by this exposure. Therefore, the integration of metabolomic and transcriptomic data could improve the extracted biological knowledge on these toxicants induced disruptions. In the present study, we applied statistical integration tools to metabolomic and transcriptomic data obtained from jejunal explants of pigs exposed to the food contaminant, deoxynivalenol (DON). Canonical correlation analysis (CCA) and self-organizing map (SOM) were compared for the identification of correlated transcriptomic and metabolomic features, and O2-PLS was used to model the relationship between exposure and selected features. The integration of both ‘omics data increased the number of discriminant metabolites discovered (39) by about 10 times compared to the analysis of the metabolomic dataset alone (3). Besides the disturbance of energy metabolism previously reported, assessing correlations between both functional levels revealed several other types of damage linked to the intestinal exposure to DON, including the alteration of protein synthesis, oxidative stress, and inflammasome activation. This confirms the added value of integration to enrich the biological knowledge extracted from metabolomics.
Published: 2021
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12. A Specific ChREBP and PPARα Cross-Talk Is Required for the Glucose-Mediated FGF21 Response

Author: Alison Iroz, Alexandra Montagner, Fadila Benhamed, Françoise Levavasseur, Arnaud Polizzi, Elodie Anthony, Marion Régnier, Edwin Fouché, Céline Lukowicz, Michèle Cauzac, Emilie Tournier, Marcio Do-Cruzeiro, Martine Daujat-Chavanieu, Sabine Gerbal-Chalouin, Véronique Fauveau, Solenne Marmier, Anne-Françoise Burnol, Sandra Guilmeau, Yannick Lippi, Jean Girard, Walter Wahli, Renaud Dentin, Hervé Guillou, and Catherine Postic
Subjects: Biology (General), QH301-705.5
Abstract: Summary: While the physiological benefits of the fibroblast growth factor 21 (FGF21) hepatokine are documented in response to fasting, little information is available on Fgf21 regulation in a glucose-overload context. We report that peroxisome-proliferator-activated receptor α (PPARα), a nuclear receptor of the fasting response, is required with the carbohydrate-sensitive transcription factor carbohydrate-responsive element-binding protein (ChREBP) to balance FGF21 glucose response. Microarray analysis indicated that only a few hepatic genes respond to fasting and glucose similarly to Fgf21. Glucose-challenged Chrebp−/− mice exhibit a marked reduction in FGF21 production, a decrease that was rescued by re-expression of an active ChREBP isoform in the liver of Chrebp−/− mice. Unexpectedly, carbohydrate challenge of hepatic Pparα knockout mice also demonstrated a PPARα-dependent glucose response for Fgf21 that was associated with an increased sucrose preference. This blunted response was due to decreased Fgf21 promoter accessibility and diminished ChREBP binding onto Fgf21 carbohydrate-responsive element (ChoRE) in hepatocytes lacking PPARα. Our study reports that PPARα is required for the ChREBP-induced glucose response of FGF21. : FGF21 is a hepatokine with beneficial metabolic effects, including control of sucrose preference. Iroz et al. demonstrate that Fgf21 is a unique hepatic gene inducible by both fasting and glucose signals and that the transcription factors PPARα and ChREBP both regulate the endocrine control of sugar intake by hepatic FGF21. Keywords: ChREBP, PPARα, FGF21, glucose intake, sucrose preference
Published: 2017
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13. Intestinal toxicity of the type B trichothecene mycotoxin fusarenon-X: whole transcriptome profiling reveals new signaling pathways

Author: Imourana Alassane-Kpembi, Juliana Rubira Gerez, Anne-Marie Cossalter, Manon Neves, Joëlle Laffitte, Claire Naylies, Yannick Lippi, Martine Kolf-Clauw, Ana Paula L. Bracarense, Philippe Pinton, and Isabelle P. Oswald
Subjects: Medicine, Science
Abstract: Abstract The few data available on fusarenon-X (FX) do not support the derivation of health-based guidance values, although preliminary results suggest higher toxicity than other regulated trichothecenes. Using histo-morphological analysis and whole transcriptome profiling, this study was designed to obtain a global view of the intestinal alterations induced by FX. Deoxynivalenol (DON) served as a benchmark. FX induced more severe histological alterations than DON. Inflammation was the hallmark of the molecular toxicity of both mycotoxins. The benchmark doses for the up-regulation of key inflammatory genes by FX were 4- to 45-fold higher than the previously reported values for DON. The transcriptome analysis revealed that both mycotoxins down-regulated the peroxisome proliferator-activated receptor (PPAR) and liver X receptor - retinoid X receptor (LXR-RXR) signaling pathways that control lipid metabolism. Interestingly, several pathways, including VDR/RXR activation, ephrin receptor signaling, and GNRH signaling, were specific to FX and thus discriminated the transcriptomic fingerprints of the two mycotoxins. These results demonstrate that FX induces more potent intestinal inflammation than DON. Moreover, although the mechanisms of toxicity of both mycotoxins are similar in many ways, this study emphasize specific pathways targeted by each mycotoxin, highlighting the need for specific mechanism-based risk assessments of Fusarium mycotoxins.
Published: 2017
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14. The brlA Gene Deletion Reveals That Patulin Biosynthesis Is Not Related to Conidiation in Penicillium expansum

Author: Chrystian Zetina-Serrano, Ophélie Rocher, Claire Naylies, Yannick Lippi, Isabelle P. Oswald, Sophie Lorber, and Olivier Puel
Subjects: Penicillium expansum, brlA, conidiogenesis, synnemata, secondary metabolism, patulin, Biology (General), QH301-705.5, Chemistry, QD1-999
Abstract: Dissemination and survival of ascomycetes is through asexual spores. The brlA gene encodes a C2H2-type zinc-finger transcription factor, which is essential for asexual development. Penicillium expansum causes blue mold disease and is the main source of patulin, a mycotoxin that contaminates apple-based food. A P. expansum PeΔbrlA deficient strain was generated by homologous recombination. In vivo, suppression of brlA completely blocked the development of conidiophores that takes place after the formation of coremia/synnemata, a required step for the perforation of the apple epicarp. Metabolome analysis displayed that patulin production was enhanced by brlA suppression, explaining a higher in vivo aggressiveness compared to the wild type (WT) strain. No patulin was detected in the synnemata, suggesting that patulin biosynthesis stopped when the fungus exited the apple. In vitro transcriptome analysis of PeΔbrlA unveiled an up-regulated biosynthetic gene cluster (PEXP_073960-PEXP_074060) that shares high similarity with the chaetoglobosin gene cluster of Chaetomium globosum. Metabolome analysis of PeΔbrlA confirmed these observations by unveiling a greater diversity of chaetoglobosin derivatives. We observed that chaetoglobosins A and C were found only in the synnemata, located outside of the apple, whereas other chaetoglobosins were detected in apple flesh, suggesting a spatial-temporal organization of the chaetoglobosin biosynthesis pathway.
Published: 2020
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15. Gene Expression Profiling Reveals that PXR Activation Inhibits Hepatic PPARα Activity and Decreases FGF21 Secretion in Male C57Bl6/J Mice

Author: Sharon Ann Barretto, Frédéric Lasserre, Anne Fougerat, Lorraine Smith, Tiffany Fougeray, Céline Lukowicz, Arnaud Polizzi, Sarra Smati, Marion Régnier, Claire Naylies, Colette Bétoulières, Yannick Lippi, Hervé Guillou, Nicolas Loiseau, Laurence Gamet-Payrastre, Laila Mselli-Lakhal, and Sandrine Ellero-Simatos
Subjects: nuclear receptors, hepatokines, transcriptomics, Biology (General), QH301-705.5, Chemistry, QD1-999
Abstract: The pregnane X receptor (PXR) is the main nuclear receptor regulating the expression of xenobiotic-metabolizing enzymes and is highly expressed in the liver and intestine. Recent studies have highlighted its additional role in lipid homeostasis, however, the mechanisms of these regulations are not fully elucidated. We investigated the transcriptomic signature of PXR activation in the liver of adult wild-type vs. Pxr-/- C57Bl6/J male mice treated with the rodent specific ligand pregnenolone 16α-carbonitrile (PCN). PXR activation increased liver triglyceride accumulation and significantly regulated the expression of 1215 genes, mostly xenobiotic-metabolizing enzymes. Among the down-regulated genes, we identified a strong peroxisome proliferator-activated receptor α (PPARα) signature. Comparison of this signature with a list of fasting-induced PPARα target genes confirmed that PXR activation decreased the expression of more than 25 PPARα target genes, among which was the hepatokine fibroblast growth factor 21 (Fgf21). PXR activation abolished plasmatic levels of FGF21. We provide a comprehensive signature of PXR activation in the liver and identify new PXR target genes that might be involved in the steatogenic effect of PXR. Moreover, we show that PXR activation down-regulates hepatic PPARα activity and FGF21 circulation, which could participate in the pleiotropic role of PXR in energy homeostasis.
Published: 2019
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16. Src is activated by the nuclear receptor peroxisome proliferator‐activated receptor β/δ in ultraviolet radiation‐induced skin cancer

Author: Alexandra Montagner, Maria B Delgado, Corinne Tallichet‐Blanc, Jeremy S K Chan, Ming K Sng, Hélène Mottaz, Gwendoline Degueurce, Yannick Lippi, Catherine Moret, Michael Baruchet, Maria Antsiferova, Sabine Werner, Daniel Hohl, Talal Al Saati, Pierre J Farmer, Nguan S Tan, Liliane Michalik, and Walter Wahli
Subjects: keratinocyte, PPAR beta/delta, Skin cancer, Src, UV, Medicine (General), R5-920, Genetics, QH426-470
Abstract: Abstract Although non‐melanoma skin cancer (NMSC) is the most common human cancer and its incidence continues to rise worldwide, the mechanisms underlying its development remain incompletely understood. Here, we unveil a cascade of events involving peroxisome proliferator‐activated receptor (PPAR) β/δ and the oncogene Src, which promotes the development of ultraviolet (UV)‐induced skin cancer in mice. UV‐induced PPARβ/δ activity, which directly stimulated Src expression, increased Src kinase activity and enhanced the EGFR/Erk1/2 signalling pathway, resulting in increased epithelial‐to‐mesenchymal transition (EMT) marker expression. Consistent with these observations, PPARβ/δ‐null mice developed fewer and smaller skin tumours, and a PPARβ/δ antagonist prevented UV‐dependent Src stimulation. Furthermore, the expression of PPARβ/δ positively correlated with the expression of SRC and EMT markers in human skin squamous cell carcinoma (SCC), and critically, linear models applied to several human epithelial cancers revealed an interaction between PPARβ/δ and SRC and TGFβ1 transcriptional levels. Taken together, these observations motivate the future evaluation of PPARβ/δ modulators to attenuate the development of several epithelial cancers.
Published: 2013
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17. Saccharomyces cerevisiae Boulardii Reduces the Deoxynivalenol-Induced Alteration of the Intestinal Transcriptome

Author: Imourana Alassane-Kpembi, Philippe Pinton, Jean-François Hupé, Manon Neves, Yannick Lippi, Sylvie Combes, Mathieu Castex, and Isabelle P. Oswald
Subjects: deoxynivalenol, Saccharomyces cerevisiae boulardii CNCM I-1079, intestine, transcriptome, inflammation, oxidative stress, lipid metabolism, Medicine
Abstract: Type B trichothecene mycotoxin deoxynivalenol (DON) is one of the most frequently occurring food contaminants. By inducing trans-activation of a number of pro-inflammatory cytokines and increasing the stability of their mRNA, trichothecene can impair intestinal health. Several yeast products, especially Saccharomyces cerevisiae, have the potential for improving the enteric health of piglets, but little is known about the mechanisms by which the administration of yeast counteracts the DON-induced intestinal alterations. Using a pig jejunum explant model, a whole-transcriptome analysis was performed to decipher the early response of the small intestine to the deleterious effects of DON after administration of S. cerevisiae boulardii strain CNCM I-1079. Compared to the control condition, no differentially expressed gene (DE) was observed after treatment by yeast only. By contrast, 3619 probes—corresponding to 2771 genes—were differentially expressed following exposure to DON, and 32 signaling pathways were identified from the IPA software functional analysis of the set of DE genes. When the intestinal explants were treated with S. cerevisiae boulardii prior to DON exposure, the number of DE genes decreased by half (1718 probes corresponding to 1384 genes). Prototypical inflammation signaling pathways triggered by DON, including NF-κB and p38 MAPK, were reversed, although the yeast demonstrated limited efficacy toward some other pathways. S. cerevisiae boulardii also restored the lipid metabolism signaling pathway, and reversed the down-regulation of the antioxidant action of vitamin C signaling pathway. The latter effect could reduce the burden of DON-induced oxidative stress. Altogether, the results show that S. cerevisiae boulardii reduces the DON-induced alteration of intestinal transcriptome, and point to new mechanisms for the healing of tissue injury by yeast.
Published: 2018
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18. Deciphering the Anti-Aflatoxinogenic Properties of Eugenol Using a Large-Scale q-PCR Approach

Author: Isaura Caceres, Rhoda El Khoury, Ángel Medina, Yannick Lippi, Claire Naylies, Ali Atoui, André El Khoury, Isabelle P. Oswald, Jean-Denis Bailly, and Olivier Puel
Subjects: Aflatoxin B1, Aspergillus flavus, aflatoxinogenesis, molecular tool, gene regulation, eugenol, Medicine
Abstract: Produced by several species of Aspergillus, Aflatoxin B1 (AFB1) is a carcinogenic mycotoxin contaminating many crops worldwide. The utilization of fungicides is currently one of the most common methods; nevertheless, their use is not environmentally or economically sound. Thus, the use of natural compounds able to block aflatoxinogenesis could represent an alternative strategy to limit food and feed contamination. For instance, eugenol, a 4-allyl-2-methoxyphenol present in many essential oils, has been identified as an anti-aflatoxin molecule. However, its precise mechanism of action has yet to be clarified. The production of AFB1 is associated with the expression of a 70 kB cluster, and not less than 21 enzymatic reactions are necessary for its production. Based on former empirical data, a molecular tool composed of 60 genes targeting 27 genes of aflatoxin B1 cluster and 33 genes encoding the main regulatory factors potentially involved in its production, was developed. We showed that AFB1 inhibition in Aspergillus flavus following eugenol addition at 0.5 mM in a Malt Extract Agar (MEA) medium resulted in a complete inhibition of the expression of all but one gene of the AFB1 biosynthesis cluster. This transcriptomic effect followed a down-regulation of the complex composed by the two internal regulatory factors, AflR and AflS. This phenomenon was also influenced by an over-expression of veA and mtfA, two genes that are directly linked to AFB1 cluster regulation.
Published: 2016
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19. CD44v3 is a marker of invasive cancer stem cells driving metastasis in gastric carcinoma

Author: Julie Giraud, Lornella Seeneevassen, Benoit Rousseau, Damien Bouriez, Elodie Sifré, Alban Giese, Tra Ly Nguyen, Camille Tiffon, Yannick Lippi, Lamia Azzi-Martin, Julie Pannequin, Armelle Ménard, Emilie Bessède, Cathy Staedel, Francis Mégraud, Geneviève Belleannée, Philippe Lehours, Caroline Gronnier, Pierre Dubus, Christine Varon, BoRdeaux Institute in onCology (Inserm U1312 - BRIC), Université de Bordeaux (UB)-Institut National de la Santé et de la Recherche Médicale (INSERM), Université de Bordeaux (UB), Hôpital Haut-Lévêque [CHU Bordeaux], CHU Bordeaux [Bordeaux], ToxAlim (ToxAlim), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole Nationale Vétérinaire de Toulouse (ENVT), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Ecole Nationale Vétérinaire de Toulouse (ENVT), Institut de Génomique Fonctionnelle (IGF), Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), Régulations Naturelles et Artificielles (ARNA), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Bordeaux Ségalen [Bordeaux 2], Hôpital Pellegrin, CHU Bordeaux [Bordeaux]-Groupe hospitalier Pellegrin, French ‘Institut National du Cancer’ (PLBio INCa, grant number 2014-152), La Ligue contre le Cancer (C Tiffon PhD salary, regional research grants comité Dordogne grant number R17013GG and comité Gironde grant number GM/12.17/37), UFR des sciences médicales Univ. Bordeaux (J Giraud and D Bouriez financial support), French ministry of national education, research and technologies (L Seeneevassen PhD salary)., and LESUR, Hélène
Subjects: [SDV] Life Sciences [q-bio], Cancer Research, [SDV.CAN] Life Sciences [q-bio]/Cancer, Oncology, Cancer stem cells, Metastasis initiating cells, [SDV]Life Sciences [q-bio], Gastroenterology, [SDV.CAN]Life Sciences [q-bio]/Cancer, General Medicine, CD44 variant, Epithelial-mesenchymal transition, Gastric cancer
Abstract: Background Cancer stem cells (CSCs) are at the origin of tumour initiation and progression in gastric adenocarcinoma (GC). However, markers of metastasis-initiating cells remain unidentified in GC. In this study, we characterized CD44 variants expressed in GC and evaluated the tumorigenic and metastatic properties of CD44v3+ cells and their clinical significance in GC patients. Methods Using GC cell lines and patient-derived xenografts, we evaluated CD44+ and CD44v3+ GC cells molecular signature and their tumorigenic, chemoresistance, invasive and metastatic properties, and expression in patients-derived tissues. Results CD44v3+ cells, which represented a subpopulation of CD44+ cells, were detected in advanced preneoplastic lesions and presented CSCs chemoresistance and tumorigenic properties in vitro and in vivo. Molecular and functional analyses revealed two subpopulations of gastric CSCs: CD44v3+ CSCs with an epithelial-mesenchymal transition (EMT)-like signature, and CD44+/v3– CSCs with an epithelial-like signature; both were tumorigenic but CD44v3+ cells showed higher invasive and metastatic properties in vivo. CD44v3+ cells detected in the primary tumours of GC patients were associated with a worse prognosis. Conclusion CD44v3 is a marker of a subpopulation of CSCs with metastatic properties in GC. The identification of metastasis-initiating cells in GC represents a major advance for further development of anti-metastatic therapeutic strategies.
Published: 2022

20. Effect of Streptomyces roseolus Cell-Free Supernatants on the Fungal Development, Transcriptome, and Aflatoxin B1 Production of Aspergillus flavus

Author: Snini, Louise Maud, Florian Boyer, Vanessa Durrieu, Julie Bornot, Yannick Lippi, Claire Naylies, Sophie Lorber, Olivier Puel, Florence Mathieu, and Selma P.
Subjects: Aspergillus flavus, Streptomyces roseolus, cell-free supernatant, biocontrol, aflatoxin B1, transcriptomic analysis
Abstract: Crop contamination by aflatoxin B1 (AFB1), an Aspergillus-flavus-produced toxin, is frequently observed in tropical and subtropical regions. This phenomenon is emerging in Europe, most likely as a result of climate change. Alternative methods, such as biocontrol agents (BCAs), are currently being developed to reduce the use of chemicals in the prevention of mycotoxin contamination. Actinobacteria are known to produce many bioactive compounds, and some of them can reduce in vitro AFB1 concentration. In this context, the present study aims to analyze the effect of a cell-free supernatant (CFS) from Streptomyces roseolus culture on the development of A. flavus, as well as on its transcriptome profile using microarray assay and its impact on AFB1 concentration. Results demonstrated that in vitro, the S.roseolus CFS reduced the dry weight and conidiation of A.flavus from 77% and 43%, respectively, and was therefore associated with a reduction in AFB1 concentration reduction to levels under the limit of quantification. The transcriptomic data analysis revealed that 5198 genes were differentially expressed in response to the CFS exposure and among them 5169 were downregulated including most of the genes involved in biosynthetic gene clusters. The aflatoxins’ gene cluster was the most downregulated. Other gene clusters, such as the aspergillic acid, aspirochlorine, and ustiloxin B gene clusters, were also downregulated and associated with a variation in their concentration, confirmed by LC-HRMS.
Published: 2023
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21. Pharmacological activation of constitutive androstane receptor induces female-specific modulation of hepatic metabolism

Author: Marine, Huillet, primary, Frédéric, Lasserre, additional, Marie-Pierre, Gratacap, additional, Beatrice, Engelmann, additional, Justine, Bruse, additional, Arnaud, Polizzi, additional, Tiffany, Fougeray, additional, Céline, Martin, additional, Clémence, Rives, additional, Anne, Fougerat, additional, Claire, Naylies, additional, Yannick, Lippi, additional, Géraldine, Garcia, additional, Elodie, Rousseau- Bacquie, additional, Cécile, Canlet, additional, Laurent, Debrauwer, additional, Ulrike, Rolle-Kampczyk, additional, Martin, von Bergen, additional, Bernard, Payrastre, additional, Elisa, Boutet-Robinet, additional, Laurence, Gamet-Payrastre, additional, Hervé, Guillou, additional, Nicolas, Loiseau, additional, and Sandrine, Ellero-Simatos, additional
Published: 2023
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22. Obesity promotes fumonisin B1 hepatotoxicity

Author: Léonie Dopavogui, Marion Régnier, Arnaud Polizzi, Quentin Ponchon, Sarra Smati, Wendy Klement, Frédéric Lasserre, Céline Lukowicz, Yannick Lippi, Anne Fougerat, Justine Bertrand-Michel, Claire Naylies, Cécile Canlet, Laurent Debrauwer, Elodie Rousseau-Bacquié, Laurence Gamet-Payrastre, Charlène Dauriat, Josefina Casas, Siska Croubels, Siegrid De Baere, Hester M. Burger, Benoit Chassaing, Sandrine Ellero-Simatos, Hervé Guillou, Isabelle P. Oswald, Nicolas Loiseau, and European Research Council
Subjects: Environmental Engineering, Steatosis, toxicity, health, Pollution, Fumonisin B1, food safety, mycotoxins, Medicine and Health Sciences, Environmental Chemistry, contaminants, Obesity, Veterinary Sciences, Waste Management and Disposal, Ensure healthy lives and promote well-being for all at all ages, Steatohepatitis
Abstract: Obesity, which is a worldwide public health issue, is associated with chronic inflammation that contribute to long-term complications, including insulin resistance, type 2 diabetes and non-alcoholic fatty liver disease. We hypothesized that obesity may also influence the sensitivity to food contaminants, such as fumonisin B1 (FB1), a mycotoxin produced mainly by the Fusarium verticillioides. FB1, a common contaminant of corn, is the most abundant and best characterized member of the fumonisins family. We investigated whether diet-induced obesity could modulate the sensitivity to oral FB1 exposure, with emphasis on gut health and hepatotoxicity. Thus, metabolic effects of FB1 were assessed in obese and non-obese male C57BL/6J mice. Mice received a high-fat diet (HFD) or normal chow diet (CHOW) for 15 weeks. Then, during the last three weeks, mice were exposed to these diets in combination or not with FB1 (10 mg/kg body weight/day) through drinking water. As expected, HFD feeding induced significant body weight gain, increased fasting glycemia, and hepatic steatosis. Combined exposure to HFD and FB1 resulted in body weight loss and a decrease in fasting blood glucose level. This co-exposition also induces gut dysbiosis, an increase in plasma FB1 level, a decrease in liver weight and hepatic steatosis. Moreover, plasma transaminase levels were significantly increased and associated with liver inflammation in HFD/FB1-treated mice. Liver gene expression analysis revealed that the combined exposure to HFD and FB1 was associated with reduced expression of genes involved in lipogenesis and increased expression of immune response and cell cycle-associated genes. These results suggest that, in the context of obesity, FB1 exposure promotes gut dysbiosis and severe liver inflammation. To our knowledge, this study provides the first example of obesity-induced hepatitis in response to a food contaminant., L.D. PhD was supported by the INRAE Animal Health department. This work was also supported by grants from the French National Research Agency (ANR) Fumolip (ANR-16-CE21-0003) and the Hepatomics FEDER program of Région Occitanie. We thank Prof Wentzel C. Gelderblom for generously providing the FB1 and for his interest and support in our project. B.C. laboratory is supported by a Starting Grant from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (grant agreement No. ERC-2018-StG- 804135), a Chaire d'Excellence from IdEx Université de Paris - ANR-18-IDEX-0001, an Innovator Award from the Kenneth Rainin Foundation, an ANR grant EMULBIONT ANR-21-CE15-0042-01 and the national program “Microbiote” from INSERM. We thank Anexplo (Genotoul, Toulouse) for their excellent work on plasma biochemistry. Neutral Lipids MS and NMR experiments were performed with instruments in the Metatoul-AXIOM platform. Sphingolipid MS analysis were performed with instruments in the RUBAM platform. The FB1 plasma levels were determined using an UPLC-MS/MS instrument part of the Ghent University MSsmall expertise centre for advanced mass spectrometry analysis of small organic molecules. We thank Elodie Rousseau-Bacquié and all members of the EZOP staff for their assistance in the animal facility. We are very grateful to Talal al Saati for histology analyses and review, and we thank all members of the US006/CREFRE staff at the histology facility and the Genom'IC platforms (INSERM U1016, Paris, France) for their expertise.
Published: 2023

23. Obesity promotes Fumonisin B1 toxicity and induces hepatitis

Author: Léonie Dopavogui, Marion Régnier, Arnaud Polizzi, Quentin Ponchon, Sarra Smati, Wendy Klement, Frédéric Lasserre, Céline Lukowicz, Yannick Lippi, Anne Fougerat, Justine Bertrand-Michel, Claire Naylies, Cécile Canlet, Laurent Debrauwer, Laurence Gamet-Payrastre, Charlène Dauriat, Josefina Casas, Siska Croubels, Siegrid De Baere, Hester M. Burger, Benoit Chassaing, Sandrine Ellero-Simatos, Hervé Guillou, Isabelle P. Oswald, and Nicolas Loiseau
Abstract: Background and aimObesity is a major public health issue worldwide. Obesity is associated with chronic inflammation that contribute to long-term complications, including insulin resistance, type 2 diabetes and non-alcoholic fatty liver disease. We hypothesized that obesity may also influence the sensitivity to food contaminants, such as fumonisin B1 (FB1), a mycotoxin produced mainly by theFusarium verticillioides. FB1, a common contaminant of corn, is the most abundant and best characterized member of the fumonisins family. This toxin provokes severe mycotoxicosis in animals, which leads to hepatotoxicity and alterations in the immune response and intestinal barrier permeability. We investigated here whether diet-induced obesity could modulate the sensitivity to oral FB1 exposure, with emphasis on gut health and hepatotoxicity.MethodsThe metabolic effects of FB1 were assessed in obese and non-obese male C57BL/6J mice. For 15 weeks, mice received a high-fat diet (HFD) or normal chow diet (CHOW). During the last three weeks, mice were exposed or not to FB1 (10 mg/kg body weight/day) through drinking water.ResultsAs expected, HFD feeding induced significant body weight gain, glucose intolerance, and hepatic steatosis. FB1-exposed mice displayed a higher sphinganine/sphingosine ratio, a well-known FB1 biomarker of exposure, due to inhibition of ceramide synthases activity by FB1. Combined exposure to HFD and FB1 resulted in body weight loss and a decrease in fasting blood glucose level. This co-exposition also induces gut dysbiosis, an increase in plasma FB1 level, a decrease in liver weight and hepatic steatosis. Moreover, plasma transaminase levels were significantly increased and associated with liver inflammation in HFD/FB1-treated mice. Liver gene expression analysis revealed that the combined exposure to HFD and FB1 was associated with reduced expression of genes involved in lipogenesis and increased expression of immune response and cell cycle-associated genes.ConclusionThese results suggest that, in the context of obesity, FB1 exposure promotes gut dysbiosis and severe liver inflammation. To our knowledge, this study provides the first example of obesity-induced hepatitis in response to a food contaminant.
Published: 2022

24. Intestinal toxicity of the new type A trichothecenes, NX and 3ANX

Author: Sylvie Puel, J. David Miller, Laura Soler, Isabelle P. Oswald, Yannick Lippi, Manon Neves, Alix Pierron, Biosynthèse & Toxicité des Mycotoxines (ToxAlim-BioToMyc), ToxAlim (ToxAlim), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole Nationale Vétérinaire de Toulouse (ENVT), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Transcriptomic impact of Xenobiotics (E23 TRiX), Plateforme Génome & Transcriptome (GET), Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-ToxAlim (ToxAlim), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Carleton College, This research was supported in part by the ANR grant 'Newmyco' (ANR-15-CE21-0010), the ANR grant 'EmergingMyco' (ANR-18-CE34-0014) and the Ontario Ministry of Food and Agriculture (FS2015-2617/SF6115)., ANR-15-CE21-0010,Newmyco,Metabolome de deux contaminants fongiques du blé d'importance majeure: identification de nouveaux métabolites toxiques(2015), ANR-18-CE34-0014,EmergingMyco,Les mycotoxines émergentes : un nouveau risque pour l'Homme et les animaux ?(2018), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), and Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse)
Subjects: Fusarium, Environmental Engineering, Swine, Health, Toxicology and Mutagenesis, Cell, Explant, Trichothecenes, Type A, Transcriptome, 03 medical and health sciences, Immune system, medicine, Environmental Chemistry, Animals, Humans, Gut, Intestinal Mucosa, 030304 developmental biology, 0303 health sciences, biology, Cell growth, Chemistry, Gene Expression Profiling, 030302 biochemistry & molecular biology, Public Health, Environmental and Occupational Health, General Medicine, General Chemistry, biology.organism_classification, Pollution, Molecular biology, Deoxynivalenol, 3. Good health, Fusarium graminearum, medicine.anatomical_structure, Vacuolization, Apoptosis, [SDV.TOX]Life Sciences [q-bio]/Toxicology, Toxicity, Caco-2 Cells, Trichothecenes
Abstract: International audience; NX and its acetylated form 3ANX are two new type A trichothecenes produced by Fusarium graminearum whose toxicity is poorly documented. The aim of this study was to obtain a general view of the intestinal toxicity of these toxins. Deoxynivalenol (DON), which differs from NX by the keto group at C8, served as a benchmark. The viability of human intestinal Caco-2 cells decreased after 24 h of exposure to 3 μM NX (−21.4%), 3 μM DON (−20.2%) or 10 μM 3ANX (−17.4%). Histological observations of porcine jejunal explants exposed for 4 h to 10 μM of the different toxins showed interstitial edema and cellular debris. Explants exposed to NX also displayed cell vacuolization, a broken epithelial barrier and high loss of villi. Whole transcriptome profiling revealed that NX, DON and 3ANX modulated 369, 146 and 55 genes, respectively. Functional analyses indicated that the three toxins regulate the same gene networks and signaling pathways mainly; cell proliferation, differentiation, apoptosis and growth, and particularly immune and pro-inflammatory responses. Greater transcriptional impacts were observed with NX than with DON. In conclusion, our data revealed that the three toxins have similar impacts on the intestine but of different magnitude: NX > DON ≫ 3ANX. NX and 3ANX should consequently be included in overall risk analysis linked to the presence of trichothecenes in our diet.
Published: 2022

25. Implication of VelB in the development, pathogenicity, and secondary metabolism of Penicillium expansum

Author: Nadia Tahtah, Chrystian Zetina-Serrano, Ophélie Rocher, Claire Naylies, Yannick Lippi, André El Khoury, Ali Atoui, Emilien L. Jamin, Isabelle P. Oswald, Sophie Lorber, and Olivier Puel
Subjects: Horticulture, Agronomy and Crop Science, Food Science
Published: 2023

26. Chronic exposure to Cytolethal Distending Toxin (CDT) promotes a cGAS-dependent type I interferon response

Author: Claire Naylies, Gladys Mirey, Patrick Rouimi, Benoît J. Pons, Maxime Deslande, Saleha Hashim, Julien Vignard, Catherine Bouchenot, Yannick Lippi, Frédéric Taieb, Aurélie Pettes-Duler, Génotoxicité & Signalisation (ToxAlim-GS), ToxAlim (ToxAlim), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole Nationale Vétérinaire de Toulouse (ENVT), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Endocrinologie & Toxicologie de la Barrière Intestinale (ToxAlim-ENTeRisk), Transcriptomic impact of Xenobiotics (E23 TRiX), Plateforme Génome & Transcriptome (GET), Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-ToxAlim (ToxAlim), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Ecole Nationale Vétérinaire de Toulouse (ENVT), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Contaminants & Stress Cellulaire (ToxAlim-COMICS), This work was supported by the ANR Grant No ANR-10-CESA-011 to G. Mirey, the Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement (INRAE) and the Toxalim internal program to J. Vignard. B.J. Pons was supported by a Ph.D. fellowship granted by the COLiveTox IDEX Toulouse University., ANR-10-CESA-0011,GENOTOXTRACK,Biomarqueurs de génotoxicité ex vivo et in vivo.(2010), Vignard, Julien, CONTAMINANTS, ECOSYSTEMES, SANTE - Biomarqueurs de génotoxicité ex vivo et in vivo. - - GENOTOXTRACK2010 - ANR-10-CESA-0011 - CES - VALID, Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Ecole Nationale Vétérinaire de Toulouse (ENVT), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), and Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-ToxAlim (ToxAlim)
Subjects: 0301 basic medicine, Cell division, Cytolethal distending toxin, [SDV]Life Sciences [q-bio], [SDV.BC.BC]Life Sciences [q-bio]/Cellular Biology/Subcellular Processes [q-bio.SC], DNA damage response, medicine.disease_cause, [SDV.IMM.II]Life Sciences [q-bio]/Immunology/Innate immunity, Mice, 0302 clinical medicine, Interferon, DNA Breaks, Double-Stranded, Nucleotidyltransferases, 3. Good health, Cell biology, Up-Regulation, Interferon Type I, cGAS-STING axis, Molecular Medicine, medicine.drug, DNA damage, Bacterial Toxins, Bacterial genotoxin, Mitosis, [SDV.TOX.TCA]Life Sciences [q-bio]/Toxicology/Toxicology and food chain, Biology, 03 medical and health sciences, Cellular and Molecular Neuroscience, Immune system, [SDV.BC.BC] Life Sciences [q-bio]/Cellular Biology/Subcellular Processes [q-bio.SC], medicine, Animals, Humans, Fragmentation (cell biology), [SDV.IMM.II] Life Sciences [q-bio]/Immunology/Innate immunity, Interferon-stimulated genes, Molecular Biology, Pharmacology, Epithelial Cells, Cell Biology, Cell Cycle Checkpoints, Fibroblasts, [SDV.MP.BAC]Life Sciences [q-bio]/Microbiology and Parasitology/Bacteriology, 030104 developmental biology, [SDV.TOX.TCA] Life Sciences [q-bio]/Toxicology/Toxicology and food chain, Micronucleus, [SDV.MP.BAC] Life Sciences [q-bio]/Microbiology and Parasitology/Bacteriology, Carcinogenesis, 030217 neurology & neurosurgery, HeLa Cells
Abstract: The Cytolethal Distending Toxin (CDT) is a bacterial genotoxin produced by pathogenic bacteria causing major foodborne diseases worldwide. CDT activates the DNA Damage Response and modulates the host immune response, but the precise relationship between these outcomes has not been addressed so far. Here, we show that chronic exposure to CDT in HeLa cells or mouse embryonic fibroblasts promotes a strong type I interferon (IFN) response that depends on the cytoplasmic DNA sensor cyclic guanosine monophosphate (GMP)-adenosine monophosphate (AMP) synthase (cGAS) through the recognition of micronuclei. Indeed, despite active cell cycle checkpoints and in contrast to other DNA damaging agents, cells exposed to CDT reach mitosis where they accumulate massive DNA damage, resulting in chromosome fragmentation and micronucleus formation in daughter cells. These mitotic phenotypes are observed with CDT from various origins and in cancer or normal cell lines. Finally, we show that CDT exposure in immortalized normal colonic epithelial cells is associated to cGAS protein loss and low type I IFN response, implying that CDT immunomodulatory function may vary depending on tissue and cell type. Thus, our results establish a direct link between CDT-induced DNA damage, genetic instability and the cellular immune response that may be relevant in the context of natural infection associated to chronic inflammation or carcinogenesis.
Published: 2021

27. ATGL-dependent white adipose tissue lipolysis controls hepatocyte PPARα activity

Author: Anne Fougerat, Gabriele Schoiswohl, Arnaud Polizzi, Marion Régnier, Carina Wagner, Sarra Smati, Tiffany Fougeray, Yannick Lippi, Frederic Lasserre, Ilyès Raho, Valentine Melin, Blandine Tramunt, Raphaël Métivier, Caroline Sommer, Fadila Benhamed, Chantal Alkhoury, Franziska Greulich, Céline Jouffe, Anthony Emile, Michael Schupp, Pierre Gourdy, Patricia Dubot, Thierry Levade, Delphine Meynard, Sandrine Ellero-Simatos, Laurence Gamet-Payrastre, Ganna Panasyuk, Henriette Uhlenhaut, Ez-Zoubir Amri, Céline Cruciani-Guglielmacci, Catherine Postic, Walter Wahli, Nicolas Loiseau, Alexandra Montagner, Dominique Langin, Achim Lass, Hervé Guillou, Graz University of Technology [Graz] (TU Graz), ToxAlim (ToxAlim), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole Nationale Vétérinaire de Toulouse (ENVT), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Centre hospitalier universitaire de Nantes (CHU Nantes), Transcriptomic impact of Xenobiotics (E23 TRiX), Plateforme Génome & Transcriptome (GET), Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-ToxAlim (ToxAlim), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Unité de Biologie Fonctionnelle et Adaptative (BFA (UMR_8251 / U1133)), Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPC), Institut des Maladies Métaboliques et Casdiovasculaires (UPS/Inserm U1297 - I2MC), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM), CHU Toulouse [Toulouse], Institut de Génétique et Développement de Rennes (IGDR), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS)-Structure Fédérative de Recherche en Biologie et Santé de Rennes ( Biosit : Biologie - Santé - Innovation Technologique ), Institut Cochin (IC UM3 (UMR 8104 / U1016)), Institut Necker Enfants-Malades (INEM - UM 111 (UMR 8253 / U1151)), Technische Universität Munchen - Université Technique de Munich [Munich, Allemagne] (TUM), Helmholtz-Zentrum München (HZM), Charité - UniversitätsMedizin = Charité - University Hospital [Berlin], Centre de Recherches en Cancérologie de Toulouse (CRCT), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche en Santé Digestive (IRSD ), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Toxicologie Intégrative & Métabolisme (ToxAlim-TIM), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), German Research Center for Environmental Health - Helmholtz Center München (GmbH), Institut de Biologie Valrose (IBV), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA), Nanyang Technological University [Singapour], University of Lausanne (UNIL), BioTechMed-Graz, Graz University of Technology [Graz] (TU Graz)-Karl-Franzens-Universität [Graz, Autriche]-Medical University Graz, Région Occitanie, FRM (FDM201906008682), Boulos Foundation, ERC-2018-COG-MetaboSENS-819543, German Research Foundation (DFG) (SCH 2546/5-1), the Leuchtturmprojekt/Flagship Project 'Lipases and Lipid Signaling' funded by BioTechMed-Graz, ANR-16-CE14-0029,NUTRISENSPIK,Déterminants moléculaires de l'homéostasie hépatique nutritive(2016), ANR-17-CE14-0015,HepAdialogue,Impact du métabolisme des acides gras des tissus adipeux et du foie sur l'insulinorésistance(2017), ANR-21-CE14-0079,Hepatologic,Réseau de controle des réponses transcriptionnelles hépatiques aux challenges nutritionnels par des récepteurs nucléaires(2021), European Project: 267196,EC:FP7:PEOPLE,FP7-PEOPLE-2010-COFUND,AGREENSKILLS(2012), Université de Toulouse (UT)-Université de Toulouse (UT)-Ecole Nationale Vétérinaire de Toulouse (ENVT), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Ecole d'Ingénieurs de Purpan (INP - PURPAN), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Medical University of Graz, Ecole d'Ingénieurs de Purpan (INP - PURPAN), Université de Toulouse (UT)-Université de Toulouse (UT), unité de recherche de l'institut du thorax UMR1087 UMR6291 (ITX), Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Nantes Université - UFR de Médecine et des Techniques Médicales (Nantes Univ - UFR MEDECINE), Nantes Université - pôle Santé, Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Nantes Université - pôle Santé, Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ), Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National de la Santé et de la Recherche Médicale (INSERM), Service Diabétologie [CHU Toulouse], Pôle Cardiovasculaire et Métabolique [CHU Toulouse], Centre Hospitalier Universitaire de Toulouse (CHU Toulouse)-Centre Hospitalier Universitaire de Toulouse (CHU Toulouse), Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS)-Structure Fédérative de Recherche en Biologie et Santé de Rennes ( Biosit : Biologie - Santé - Innovation Technologique ), Helmholtz Zentrum München = German Research Center for Environmental Health, Centre Hospitalier Universitaire de Toulouse (CHU Toulouse), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Université de Toulouse (UT)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Lee Kong Chian School of Medicine, Institut Universitaire de France (IUF), Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.), Technische Universität Graz (TU Graz), Région Occitanie B.T. was supported by FRM (FDM201906008682)., Boulos Foundation and FRM., German Research Foundation (DFG) (SCH 2546/5-1 to M.S.), I3535, andP34899 (A.L.) by Austrian Science Fund (FWF, ERC-2018-COG-MetaboSENS- 819543 (G.P.), the Leuchtturmprojekt/Flagship Project ‘‘Lipases and Lipid Signaling’’ (A.L.), funded by BioTechMed-Graz, and by P28882-B21 (G.S.), European Project: 609398,EC:FP7:PEOPLE,FP7-PEOPLE-2013-COFUND,AGREENSKILLSPLUS(2014), Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, LESUR, Hélène, Impact du métabolisme des acides gras des tissus adipeux et du foie sur l'insulinorésistance - - HepAdialogue2017 - ANR-17-CE14-0015 - AAPG2017 - VALID, Réseau de controle des réponses transcriptionnelles hépatiques aux challenges nutritionnels par des récepteurs nucléaires - - Hepatologic2021 - ANR-21-CE14-0079 - AAPG2021 - VALID, Déterminants moléculaires de l'homéostasie hépatique nutritive - - NUTRISENSPIK2016 - ANR-16-CE14-0029 - AAPG2016 - VALID, and AgreenSkills+ - AGREENSKILLSPLUS - - EC:FP7:PEOPLE2014-05-05 - 2019-05-04 - 609398 - VALID
Subjects: fasting, [SDV.MHEP.PHY] Life Sciences [q-bio]/Human health and pathology/Tissues and Organs [q-bio.TO], Adipose Tissue, White, Metabolism, Fgf21, Pparα, Fasting, Ketogenesis, Lipolysis [Atgl, Cp], [SDV.BC]Life Sciences [q-bio]/Cellular Biology, Ketone Bodies, [SDV.TOX.TCA]Life Sciences [q-bio]/Toxicology/Toxicology and food chain, [SDV.BBM.BM] Life Sciences [q-bio]/Biochemistry, Molecular Biology/Molecular biology, PPARα, General Biochemistry, Genetics and Molecular Biology, ATGL, FGF21, Adipose Tissue, Brown, [SDV.MHEP.PHY]Life Sciences [q-bio]/Human health and pathology/Tissues and Organs [q-bio.TO], PPAR alpha, [SDV.BBM]Life Sciences [q-bio]/Biochemistry, Molecular Biology, [SDV.BC] Life Sciences [q-bio]/Cellular Biology, [SDV.MHEP] Life Sciences [q-bio]/Human health and pathology, [SDV.BBM.BM]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Molecular biology, CP: Metabolism, ketogenesis, [SDV.AEN] Life Sciences [q-bio]/Food and Nutrition, Adipose Tissue, Hepatocytes, lipolysis, [SDV.AEN]Life Sciences [q-bio]/Food and Nutrition, [SDV.MHEP]Life Sciences [q-bio]/Human health and pathology
Abstract: International audience; In hepatocytes, peroxisome proliferator-activated receptor α (PPARα) orchestrates a genomic and metabolic response required for homeostasis during fasting. This includes the biosynthesis of ketone bodies and of fibroblast growth factor 21 (FGF21). Here we show that in the absence of adipose triglyceride lipase (ATGL) in adipocytes, ketone body and FGF21 production is impaired upon fasting. Liver gene expression analysis highlights a set of fasting-induced genes sensitive to both ATGL deletion in adipocytes and PPARα deletion in hepatocytes. Adipose tissue lipolysis induced by activation of the β3-adrenergic receptor also triggers such PPARα-dependent responses not only in the liver but also in brown adipose tissue (BAT). Intact PPARα activity in hepatocytes is required for the cross-talk between adipose tissues and the liver during fat mobilization.
Published: 2022

28. Integrative study of diet-induced mouse models of NAFLD identifies PPARα as a sexually dimorphic drug target

Author: Françoise Lenfant, Anne Fougerat, Cheng Zhang, Laurence Gamet-Payrastre, Marion Régnier, Maeva Guillaume, Lorraine Smith, Thierry Levade, Arnaud Polizzi, Yannick Lippi, Caroline Sommer, Marine Huillet, Talal Al Saati, Hervé Guillou, Sandrine Lagarrigue, Sarra Smati, Nicolas Loiseau, Jinghong Wan, Catherine Postic, Yuna Blum, Alain Marrot, Adil Mardinoglu, Tiffany Fougeray, Muhammad Arif, Walter Wahli, Blandine Tramunt, Christophe Bureau, Patricia Dubot, Pierre Gourdy, Sandrine Ellero-Simatos, Céline Lukowicz, Alexandra Montagner, Frédéric Lasserre, Rémy Burcelin, Aurélie Batut, Claire Naylies, Jean-François Arnal, Alexia Laroyenne, Nathalie Hennuyer, Sophie Lotersztajn, Justine Bertrand-Michel, Bart Staels, Jean-Philippe Pradère, Institut des Maladies Métaboliques et Cardiovasculaires (I2MC), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM), ToxAlim (ToxAlim), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole Nationale Vétérinaire de Toulouse (ENVT), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Toxicologie Intégrative & Métabolisme (ToxAlim-TIM), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Institut de Génétique et Développement de Rennes (IGDR), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS)-Structure Fédérative de Recherche en Biologie et Santé de Rennes ( Biosit : Biologie - Santé - Innovation Technologique ), Transcriptomic impact of Xenobiotics (E23 TRiX), Plateforme Génome & Transcriptome (GET), Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-ToxAlim (ToxAlim), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Royal Institute of Technology [Stockholm] (KTH ), ANEXPLO, Institut de pharmacologie et de biologie structurale (IPBS), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre Régional d'Exploration Fonctionnelle et Ressources Expérimentales (CREFRE), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Ecole Nationale Vétérinaire de Toulouse (ENVT), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Lab Excellence Inflamex (CRI INSERM U1149 - Bichat Medical Faculty), Université Paris Diderot - Paris 7 (UPD7), Plateforme Ezop (Ezop), Centre de Recherches en Cancérologie de Toulouse (CRCT), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Récepteurs Nucléaires, Maladies Métaboliques et Cardiovasculaires (RNMCD - U1011), Institut Pasteur de Lille, Réseau International des Instituts Pasteur (RIIP)-Réseau International des Instituts Pasteur (RIIP)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Lille-Centre Hospitalier Régional Universitaire [Lille] (CHRU Lille), Physiologie, Environnement et Génétique pour l'Animal et les Systèmes d'Elevage [Rennes] (PEGASE), Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-INSTITUT AGRO Agrocampus Ouest, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Centre de recherche sur l'Inflammation (CRI (UMR_S_1149 / ERL_8252 / U1149)), Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPC), Institut Cochin (IC UM3 (UMR 8104 / U1016)), Lee Kong Chian School of Medicine, Nanyang Technological University [Singapour], Université de Lausanne (UNIL), CHU Toulouse [Toulouse], ANR-20-CE14-0035-04, Agence Nationale de la Recherche, FATMAL, Joint Programming Initiative A healthy diet for a healthy life, N/A, Institut National de la Santé et de la Recherche Médicale, N/A, Société Française de Nutrition, N/A, Société Francophone du Diabète, N/A, Société Nationale Française de Gastro-Entérologie, N/A, Association Française pour l'Etude du Foie, N/A, Région Occitanie, N/A, Agreenskills, ANR-17-CE14-0035,PUSHUPS,Etude de la dysfonction des cellules souches musculaires au cours du sepsis(2017), LESUR, Hélène, Etude de la dysfonction des cellules souches musculaires au cours du sepsis - - PUSHUPS2017 - ANR-17-CE14-0035 - AAPG2017 - VALID, Institut des Maladies Métaboliques et Casdiovasculaires (UPS/Inserm U1297 - I2MC), Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS)-Structure Fédérative de Recherche en Biologie et Santé de Rennes ( Biosit : Biologie - Santé - Innovation Technologique ), Ligue Nationale Contre le Cancer (LNCC), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Centre Régional d'Exploration Fonctionnelle et Ressources Expérimentales (CREFRE), Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro Rennes Angers, Université de Lausanne = University of Lausanne (UNIL), Centre Hospitalier Universitaire de Toulouse (CHU Toulouse), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Structure Fédérative de Recherche en Biologie et Santé de Rennes ( Biosit : Biologie - Santé - Innovation Technologique )-Centre National de la Recherche Scientifique (CNRS)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Vétérinaire de Toulouse (ENVT), AGROCAMPUS OUEST, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Nanyang Technological University (NTU), Hôpital de Rangueil, Université de Toulouse (UT)-Université de Toulouse (UT)-Ecole Nationale Vétérinaire de Toulouse (ENVT), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Ecole d'Ingénieurs de Purpan (INP - PURPAN), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National de la Santé et de la Recherche Médicale (INSERM), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université de Toulouse (UT)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-ToxAlim (ToxAlim), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Ecole d'Ingénieurs de Purpan (INP - PURPAN), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Centre Régional d'Exploration Fonctionnelle et Ressources Expérimentales (CREFRE), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université de Toulouse (UT)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Ecole Nationale Vétérinaire de Toulouse (ENVT), Université de Toulouse (UT)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), and Récepteurs Nucléaires, Maladies Métaboliques et Cardiovasculaires - U1011 (RNMCD)
Subjects: Male, medicine.medical_specialty, [SDV]Life Sciences [q-bio], Peroxisome proliferator-activated receptor, Biology, Diet, High-Fat, Transcriptome, Mice, 03 medical and health sciences, 0302 clinical medicine, Non-alcoholic Fatty Liver Disease, Fibrosis, Internal medicine, lipid metabolism, medicine, Metabolome, Animals, Humans, PPAR alpha, nonalcoholic steatohepatitis, liver metabolism, 030304 developmental biology, chemistry.chemical_classification, 0303 health sciences, Fatty liver, Gastroenterology, [SDV.MHEP.HEG]Life Sciences [q-bio]/Human health and pathology/Hépatology and Gastroenterology, Lipid metabolism, Lipidome, medicine.disease, [SDV.MHEP.HEG] Life Sciences [q-bio]/Human health and pathology/Hépatology and Gastroenterology, Mice, Inbred C57BL, [SDV] Life Sciences [q-bio], Gene expression profiling, Disease Models, Animal, [SDV.AEN] Life Sciences [q-bio]/Food and Nutrition, Endocrinology, Liver, chemistry, gene expression, Female, 030211 gastroenterology & hepatology, [SDV.AEN]Life Sciences [q-bio]/Food and Nutrition
Abstract: ObjectiveWe evaluated the influence of sex on the pathophysiology of non-alcoholic fatty liver disease (NAFLD). We investigated diet-induced phenotypic responses to define sex-specific regulation between healthy liver and NAFLD to identify influential pathways in different preclinical murine models and their relevance in humans.DesignDifferent models of diet-induced NAFLD (high-fat diet, choline-deficient high-fat diet, Western diet or Western diet supplemented with fructose and glucose in drinking water) were compared with a control diet in male and female mice. We performed metabolic phenotyping, including plasma biochemistry and liver histology, untargeted large-scale approaches (liver metabolome, lipidome and transcriptome), gene expression profiling and network analysis to identify sex-specific pathways in the mouse liver.ResultsThe different diets induced sex-specific responses that illustrated an increased susceptibility to NAFLD in male mice. The most severe lipid accumulation and inflammation/fibrosis occurred in males receiving the high-fat diet and Western diet, respectively. Sex-biased hepatic gene signatures were identified for these different dietary challenges. The peroxisome proliferator-activated receptor α (PPARα) co-expression network was identified as sexually dimorphic, and in vivo experiments in mice demonstrated that hepatocyte PPARα determines a sex-specific response to fasting and treatment with pemafibrate, a selective PPARα agonist. Liver molecular signatures in humans also provided evidence of sexually dimorphic gene expression profiles and the sex-specific co-expression network for PPARα.ConclusionsThese findings underscore the sex specificity of NAFLD pathophysiology in preclinical studies and identify PPARα as a pivotal, sexually dimorphic, pharmacological target.Trial registration numberNCT02390232.
Published: 2021

29. The pregnane X receptor drives sexually dimorphic hepatic changes in lipid and xenobiotic metabolism in response to gut microbiota in mice

Author: Frédéric Lasserre, Sharon Barretto, Maïwenn Olier, Laurence Gamet-Payrastre, Claire Naylies, Hervé Guillou, Sandrine Bruel, Laurence Guzylack, Nicolas Loiseau, Céline Lukowicz, Elodie Person, Colette Bétoulières, Marion Régnier, Laila Mselli-Lakhal, Vassilia Theodorou, Walter Wahli, Anne Fougerat, Yannick Lippi, Arnaud Polizzi, Sarra Smati, Sandrine Ellero-Simatos, Daniel Zalko, Marine Huillet, ToxAlim (ToxAlim), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole Nationale Vétérinaire de Toulouse (ENVT), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Toxicologie Intégrative & Métabolisme (ToxAlim-TIM), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Transcriptomic impact of Xenobiotics (E23 TRiX), Plateforme Génome & Transcriptome (GET), Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-ToxAlim (ToxAlim), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Métabolisme et Xénobiotiques (ToxAlim-MeX), Plateforme Ezop (Ezop), Neuro-Gastroentérologie & Nutrition (ToxAlim-NGN), Exposition, Perturbation Endocrino-métabolique et Reproduction (ToxAlim-EXPER), Lee Kong Chian School of Medicine, Nanyang Technological University [Singapour], Center for Integrative Genomics - Institute of Bioinformatics, Génopode (CIG), Swiss Institute of Bioinformatics [Lausanne] (SIB), Université de Lausanne (UNIL)-Université de Lausanne (UNIL), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Nanyang Technological University (NTU), and Lee Kong Chian School of Medicine (LKCMedicine)
Subjects: Male, Microbiology (medical), medicine.medical_specialty, [SDV]Life Sciences [q-bio], Gut microbiota, Gut flora, Microbiology, digestive system, Xenobiotics, Transcriptome, Microbial ecology, Mice, 03 medical and health sciences, chemistry.chemical_compound, 0302 clinical medicine, NR1I2, Internal medicine, medicine, Animals, Female, Gastrointestinal Microbiome/genetics, Lipids, Liver, Mice, Inbred C57BL, Pregnane X Receptor/genetics, Fatty acid metabolism, Pregnane X receptor, Transcriptomics, Xenobiotic metabolism, Gut Microbiota, 030304 developmental biology, chemistry.chemical_classification, 0303 health sciences, biology, Effector, Research, QR100-130, Fatty acid, Biological sciences [Science], biology.organism_classification, digestive system diseases, Gastrointestinal Microbiome, 3. Good health, Endocrinology, chemistry, 030220 oncology & carcinogenesis, Xenobiotic, Drug metabolism
Abstract: Background The gut microbiota–intestine–liver relationship is emerging as an important factor in multiple hepatic pathologies, but the hepatic sensors and effectors of microbial signals are not well defined. Results By comparing publicly available liver transcriptomics data from conventional vs. germ-free mice, we identified pregnane X receptor (PXR, NR1I2) transcriptional activity as strongly affected by the absence of gut microbes. Microbiota depletion using antibiotics in Pxr+/+vs Pxr-/- C57BL/6J littermate mice followed by hepatic transcriptomics revealed that most microbiota-sensitive genes were PXR-dependent in the liver in males, but not in females. Pathway enrichment analysis suggested that microbiota–PXR interaction controlled fatty acid and xenobiotic metabolism. We confirmed that antibiotic treatment reduced liver triglyceride content and hampered xenobiotic metabolism in the liver from Pxr+/+ but not Pxr-/- male mice. Conclusions These findings identify PXR as a hepatic effector of microbiota-derived signals that regulate the host’s sexually dimorphic lipid and xenobiotic metabolisms in the liver. Thus, our results reveal a potential new mechanism for unexpected drug–drug or food–drug interactions.
Published: 2021

30. The proinflammatory response induced by the Cytolethal Distending Toxin depends on cGAS

Author: Aurélie Pettes-Duler, Soraya Tadrist, Catherine Bouchenot, Benoît J. Pons, Frédéric Taieb, Yannick Lippi, Saleha Hashim, Julien Vignard, Claire Naylies, and Gladys Mirey
Subjects: Cytolethal distending toxin, Biology, Microbiology, Proinflammatory cytokine
Abstract: The Cytolethal Distending Toxin (CDT) is a bacterial genotoxin produced by pathogenic bacteria causing major foodborne diseases worldwide. CDT activates the DNA damage response and induces inflammatory signatures in host cells, but the precise relationship between these outcomes has not been addressed so far. Here, we show that the cellular proinflammatory response and senescence induced by CDT depend on the cytoplasmic DNA sensor cGAS through the recognition of micronuclei. Indeed, despite active cell cycle checkpoints and in contrast to other DNA damaging agents, cells exposed to CDT reach mitosis where they accumulate massive DNA damage, resulting in chromosome fragmentation and micronucleus formation in daughter cells. These phenotypes are observed with CDT from various origins and in cancer or normal cell lines. Thus, our results establish a direct link between CDT-induced DNA damage, genetic instability and the cellular inflammatory response that may be relevant in the context of natural infection associated to chronic inflammation or carcinogenesis.
Published: 2021

31. The hepatocyte insulin receptor is required to program rhythmic gene expression and the liver clock

Author: Anne-Françoise Burnol, Tiffany Fougeray, Walter Wahli, Arnaud Polizzi, Lorraine Smith, Hervé Guillou, Marion Régnier, Nicolas Loiseau, Léonie Dopavogui, Yannick Lippi, Benani A, Marine Huillet, Frédéric Lasserre, Joel T. Haas, Anne Fougerat, Pierre Gourdy, Caroline Sommer, Catherine Postic, Blandine Tramunt, Claire Naylies, Sarra Smati, Sandrine Ellero-Simatos, Laurence Gamet-Payrastre, Alexandra Montagner, and Duez H
Subjects: Insulin, medicine.medical_treatment, Circadian clock, Biology, medicine.disease, Cell biology, Insulin receptor, Insulin resistance, Gene expression, medicine, biology.protein, Glucose homeostasis, Circadian rhythm, Homeostasis
Abstract: SUMMARYIn mammalian cells, gene expression is rhythmic and sensitive to various environmental and physiological stimuli. A circadian clock system helps to anticipate and synchronize gene expression with daily stimuli including cyclic light and food intake, which control the central and peripheral clock programs, respectively. Food intake also regulates insulin secretion. How much insulin contributes to the effect of feeding on the entrainment of the clock and rhythmic gene expression remains to be investigated.An important component of insulin action is mediated by changes in insulin receptor (IR)-dependent gene expression. In the liver, insulin at high levels controls the transcription of hundreds of genes involved in glucose homeostasis to promote energy storage while repressing the expression of gluconeogenic genes. In type 2 diabetes mellitus (T2DM), selective hepatic insulin resistance impairs the inhibition of hepatic glucose production while promoting lipid synthesis. This pathogenic process promoting hyperlipidemia as well as non-alcoholic fatty liver diseases.While several lines of evidence link such metabolic diseases to defective control of circadian homeostasis, the hypothesis that IR directly synchronizes the clock has not been studied in vivo. Here, we used conditional hepatocyte-restricted gene deletion to evaluate the role of IR in the regulation and oscillation of gene expression as well as in the programming of the circadian clock in adult mouse liver.
Published: 2021

32. ATGL-dependent white adipose tissue lipolysis controls hepatocyte PPARα activity

Author: Marion Régnier, Ganna Panasyuk, Michael Schupp, Yannick Lippi, Arnaud Polizzi, Chantal Alkhoury, Tiffany Fougeray, Patricia Dubot, Anne Fougerat, Sarra Smati, Anthony Emile, Gabriele Schoiswohl, Laurence Gamet-Payrastre, Carina Wagner, Valentine Melin, Catherine Postic, Nicolas Loiseau, Blandine Tramunt, Sandrine Ellero-Simatos, Ez-Zoubir Amri, Walter Wahli, Achim Lass, Dominique Langin, Alexandra Montagner, Hervé Guillou, Pierre Gourdy, Thierry Levade, and Frédéric Lasserre
Subjects: medicine.medical_specialty, FGF21, Adipose tissue, White adipose tissue, chemistry.chemical_compound, Endocrinology, medicine.anatomical_structure, chemistry, Adipocyte, Internal medicine, Hepatocyte, Adipose triglyceride lipase, Brown adipose tissue, medicine, Lipolysis
Abstract: ObjectiveIn hepatocytes, peroxisome proliferator-activated receptor α (PPARα) acts as a lipid sensor that regulates hepatic lipid catabolism during fasting and orchestrates a genomic response required for whole-body homeostasis. This includes the biosynthesis of ketone bodies and the secretion of the starvation hormone fibroblast growth factor 21 (FGF21). Several lines of evidence suggest that adipose tissue lipolysis contributes to this specific process. However, whether adipose tissue lipolysis is a dominant signal for the extensive remodeling of liver gene expression dependent on PPARα has not been investigated.MethodsFirst, using mice lacking adipose tissue lipolysis through adipocyte-specific deletion of adipose triglyceride lipase (ATGL), we characterized the responses dependent on adipocyte ATGL during fasting. Next, we performed liver whole genome expression analysis in fasted mice upon deletion of adipocyte ATGL or hepatocyte PPARα. Finally, we tested the consequences of hepatocyte-specific PPARα deficiency during pharmacological induction of adipocyte lipolysis with a β3-adrenergic receptor agonist.ResultsIn the absence of ATGL in adipocytes, ketone body and FGF21 productions were impaired in response to starvation. Liver transcriptome analysis revealed that adipocyte ATGL is critical for regulation of hepatic gene expression during fasting and highlighted a strong enrichment in PPARα target genes in this condition. Genome expression analysis confirmed that a large set of fasting-induced genes are sensitive to both ATGL and PPARα. Adipose tissue lipolysis induced by acute activation of the β3-adrenergic receptor also triggered PPARα-dependent responses in the liver, supporting a role for adipocyte-derived fatty acids as dominant signals for hepatocyte PPARα activity. In addition, the absence of hepatocyte PPARα altered brown adipose tissue (BAT) morphology and reduced UCP1 expression upon stimulation of the β3-adrenergic receptor. In agreement with this finding, mice lacking hepatocyte PPARα showed decreased tolerance to acute cold exposure.ConclusionsThese results underscore the central role of hepatocyte PPARα in the sensing of adipocyte-derived fatty acids and reveal that its activity is essential for full activation of BAT. Intact PPARα activity in hepatocytes is required for cross-talk between adipose tissues and the liver during fat mobilization during fasting and cold exposure.
Published: 2021

33. The hepatocyte insulin receptor is required to program the liver clock and rhythmic gene expression

Author: Tiffany Fougeray, Arnaud Polizzi, Marion Régnier, Anne Fougerat, Sandrine Ellero-Simatos, Yannick Lippi, Sarra Smati, Frédéric Lasserre, Blandine Tramunt, Marine Huillet, Léonie Dopavogui, Juliette Salvi, Emmanuelle Nédélec, Vincent Gigot, Lorraine Smith, Claire Naylies, Caroline Sommer, Joel T. Haas, Walter Wahli, Hélène Duez, Pierre Gourdy, Laurence Gamet-Payrastre, Alexandre Benani, Anne-Françoise Burnol, Nicolas Loiseau, Catherine Postic, Alexandra Montagner, Hervé Guillou, ToxAlim (ToxAlim), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole Nationale Vétérinaire de Toulouse (ENVT), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Institut des Maladies Métaboliques et Casdiovasculaires (UPS/Inserm U1297 - I2MC), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM), Toxicologie Intégrative & Métabolisme (ToxAlim-TIM), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Transcriptomic impact of Xenobiotics (E23 TRiX), Plateforme Génome & Transcriptome (GET), Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-ToxAlim (ToxAlim), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), unité de recherche de l'institut du thorax UMR1087 UMR6291 (ITX), Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Nantes Université - UFR de Médecine et des Techniques Médicales (Nantes Univ - UFR MEDECINE), Nantes Université - pôle Santé, Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Nantes Université - pôle Santé, Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ), Service Diabétologie [CHU Toulouse], Pôle Cardiovasculaire et Métabolique [CHU Toulouse], Centre Hospitalier Universitaire de Toulouse (CHU Toulouse)-Centre Hospitalier Universitaire de Toulouse (CHU Toulouse), Centre des Sciences du Goût et de l'Alimentation [Dijon] (CSGA), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro Dijon, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Université Bourgogne Franche-Comté [COMUE] (UBFC), Plateforme Ezop (Ezop), European Genomic Institute for Diabetes - FR 3508 (EGID), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Unité de biologie moléculaire, cellulaire et du développement - UMR5077 (MCD), Centre de Biologie Intégrative (CBI), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), Center for Integrative Genomics - Institute of Bioinformatics, Génopode (CIG), Swiss Institute of Bioinformatics [Lausanne] (SIB), Université de Lausanne = University of Lausanne (UNIL)-Université de Lausanne = University of Lausanne (UNIL), Lee Kong Chian School of Medicine, Nanyang Technological University [Singapour], Institut Cochin (IC UM3 (UMR 8104 / U1016)), Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Tunisian Ministry of Higher Education, Scientific Research and Technology., LESUR, Hélène, Lee Kong Chian School of Medicine (LKCMedicine), Université de Toulouse (UT)-Université de Toulouse (UT)-Ecole Nationale Vétérinaire de Toulouse (ENVT), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Ecole d'Ingénieurs de Purpan (INP - PURPAN), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National de la Santé et de la Recherche Médicale (INSERM), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université de Toulouse (UT)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-ToxAlim (ToxAlim), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Ecole d'Ingénieurs de Purpan (INP - PURPAN), Institut Européen de Génomique du Diabète - European Genomic Institute for Diabetes - FR 3508 (EGID), Institut Pasteur de Lille, Réseau International des Instituts Pasteur (RIIP)-Réseau International des Instituts Pasteur (RIIP)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), and Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Insulin Receptor, [SDV]Life Sciences [q-bio], CLOCK, CLOCK Proteins, Gene Expression, General Biochemistry, Genetics and Molecular Biology, Mice, Circadian Clocks, hepatocyte, [SDV.BBM] Life Sciences [q-bio]/Biochemistry, Molecular Biology, Animals, Insulin, Medicine [Science], [SDV.BBM]Life Sciences [q-bio]/Biochemistry, Molecular Biology, insulin receptor, Circadian, ARNTL Transcription Factors, CP: Metabolism, Receptor, Insulin, Circadian Rhythm, [SDV] Life Sciences [q-bio], [SDV.AEN] Life Sciences [q-bio]/Food and Nutrition, circadian, Gene Expression Regulation, Liver, Hepatocytes, CP: Molecular biology, metabolism, [SDV.AEN]Life Sciences [q-bio]/Food and Nutrition
Abstract: Liver physiology is circadian and sensitive to feeding and insulin. Food intake regulates insulin secretion and is a dominant signal for the liver clock. However, how much insulin contributes to the effect of feeding on the liver clock and rhythmic gene expression remains to be investigated. Insulin action partly depends on changes in insulin receptor (IR)-dependent gene expression. Here, we use hepatocyte-restricted gene deletion of IR to evaluate its role in the regulation and oscillation of gene expression as well as in the programming of the circadian clock in the adult mouse liver. We find that, in the absence of IR, the rhythmicity of core-clock gene expression is altered in response to day-restricted feeding. This change in core-clock gene expression is associated with defective reprogramming of liver gene expression. Our data show that an intact hepatocyte insulin receptor is required to program the liver clock and associated rhythmic gene expression. Published version T.F. was supported by a PhD grant from Toulouse University and by INRAE and Institut National du Cancer (INCA). A.F. was supported by an Agreenskills post-doctoral fellowship. B.T. was supported by FRM (FDM201906008682). A.B. was supported by ISITE-BFC (contract ANR-15-IDEX-0003). T.F., B.T., P.G., C.P., A.M., and H.G. were supported by grants from ‘‘Socie ́te ́ Francophone du Diabe‘te.’’ P.G., N.L., A.M., and H.G. were supported by grants from Re ́gion Occitanie. P.G., H.D., N.L., C.P., A.M., and H.G. were supported by a Hepatomorphic grant from ANR.
Published: 2021

34. Comparative sensitivity of proliferative and differentiated intestinal epithelial cells to the food contaminant, deoxynivalenol

Author: Manon Neves, Sylvie Puel, Yannick Lippi, Su Luo, Isabelle P. Oswald, Claire Naylies, Philippe Pinton, Chloé Terciolo, ToxAlim (ToxAlim), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole Nationale Vétérinaire de Toulouse (ENVT), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Biosynthèse & Toxicité des Mycotoxines (ToxAlim-BioToMyc), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Transcriptomic impact of Xenobiotics (E23 TRiX), Plateforme Génome & Transcriptome (GET), Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-ToxAlim (ToxAlim), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), This work was supported, in part, by the Genofood ANR project (19-CE34). Su Luo was supported by the China Scholarship Council., ANR-19-CE34-0014,Genofood,Exacerbation de la génotoxicité du microbiote intestinal par un contaminant alimentaire(2019), and Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3)
Subjects: 010504 meteorology & atmospheric sciences, Health, Toxicology and Mutagenesis, Cellular differentiation, Cytotoxicity, [SDV]Life Sciences [q-bio], Cell, 010501 environmental sciences, Biology, Toxicology, Intestinal barrier function, 01 natural sciences, Transcriptome, medicine, Humans, Viability assay, Cell proliferation, 0105 earth and related environmental sciences, Tight junction, Cell growth, Cell Differentiation, Epithelial Cells, General Medicine, Pollution, Intestinal epithelium, Intestinal cell renewal, Cell biology, Cell toxicity, medicine.anatomical_structure, Mycotoxin, [SDV.TOX]Life Sciences [q-bio]/Toxicology, Stem cell, Caco-2 Cells, Trichothecenes, [SDV.AEN]Life Sciences [q-bio]/Food and Nutrition
Abstract: International audience; The intestinal epithelium is a functional and physical barrier formed by a cell monolayer that constantly differentiates from a stem cell in the crypt. This is the first target for food contaminants, especially mycotoxins. Deoxynivalenol (DON) is one of the most prevalent mycotoxins. This study compared the effects of DON (0-100 μM) on proliferative and differentiated intestinal epithelial cells. Three cell viability assays (LDH release, ATP content and neutral red uptake) indicated that proliferative Caco-2 cells are more sensitive to DON than differentiated ones. The establishment of transepithelial electrical resistance (TEER), as a read out of the differentiation process, was delayed in proliferative cells after exposure to 1 μM DON. Transcriptome analysis of proliferative and differentiated exposure to 0-3 μM DON for 24 h revealed 4862 differentially expressed genes (DEG) and indicated an effect of both the differentiation status and the DON treatment. KEGG enrichment analysis indicated involvement of metabolism, ECM receptors and tight junctions in the differentiation process, while ribosome biogenesis, mRNA surveillance, and the MAPK pathway were involved in the response to DON. The number of differentially expressed genes and the amplitude of the effect were higher in proliferative cells exposed to DON than that in differentiated cells. In conclusion, our study shows that proliferative cells are more susceptible than differentiated ones to DON and that the mycotoxin delays the differentiation process.
Published: 2020

35. Cytolethal Distending Toxin: from mitotic DNA damage to cGAS-dependent pro-inflammatory response

Author: Benoît J. Pons, Julien Vignard, Yannick Lippi, Aurélie Pettes-Duler, Soraya Tadrist, Claire Naylies, Gladys Mirey, Saleha Hashim, and Frédéric Taieb
Subjects: Senescence, chemistry.chemical_compound, Cytolethal distending toxin, chemistry, DNA damage, Micronucleus test, Fragmentation (cell biology), Cell cycle, Biology, Mitosis, DNA, Cell biology
Abstract: The Cytolethal Distending Toxin (CDT) is a bacterial genotoxin that activates the DNA damage response and induces inflammatory signatures in host cells, but the precise relationship between these outcomes has not been addressed so far. CDT induces a singular time-dependent increase of DNA damage and cell cycle defects, questioning on possible impaired response to this toxin over the cell cycle. Here, we identify mitosis as a crucial phase during CDT intoxination. Despite active cell cycle checkpoints and in contrast to other DNA damaging agents, CDT-exposed cells reach mitosis where they accumulate massive DNA damage, resulting in chromosome fragmentation and micronucleus formation. These micronuclei are recognized by cGAS that elicits an inflammatory signature resulting in cell distention and senescence. Our results unravel for the first time the mitotic consequences of CDT genotoxic activity and relate them to pro-inflammatory cellular response. These findings may have important implications during bacterial infection regarding CDT-mediated immunomodulatory and tumorigenic processes.
Published: 2020

36. Author Correction: Dimorphic metabolic and endocrine disorders in mice lacking the constitutive androstane receptor

Author: Marion Régnier, Vassilia Theodorou, Hervé Guillou, Yannick Lippi, Frédéric Lasserre, Sarra Smati, Françoise Lenfant, Laurence Guzylack-Pirou, Claire Naylies, Arnaud Polizzi, Nicolas Loiseau, Céline Lukowicz, Sandrine Ménard, Sharon Barretto, Frédéric Boudou, Pierre Gourdy, Fabiana Oliviero, Justine Bertrand-Michel, Laila Mselli-Lakhal, Anne Fougerat, Alexandra Montagner, Sandrine Ellero-Simatos, Afifa Ait Belgnaoui, Laurence Gamet-Payrastre, Nicola Marchi, ToxAlim (ToxAlim), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole Nationale Vétérinaire de Toulouse (ENVT), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Toxicologie Intégrative & Métabolisme (ToxAlim-TIM), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Exposition, Perturbation Endocrino-métabolique et Reproduction (ToxAlim-EXPER), Institut National de la Santé et de la Recherche Médicale (INSERM), Neuro-Gastroentérologie & Nutrition (ToxAlim-NGN), Transcriptomic impact of Xenobiotics (E23 TRiX), Plateforme Génome & Transcriptome (GET), Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-ToxAlim (ToxAlim), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Institut des Maladies Métaboliques et Cardiovasculaires (I2MC), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM), MetaboHUB, Centre National de la Recherche Scientifique (CNRS), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), and ProdInra, Migration
Subjects: 0303 health sciences, medicine.medical_specialty, Multidisciplinary, lcsh:R, lcsh:Medicine, Biology, 3. Good health, [SDV.TOX] Life Sciences [q-bio]/Toxicology, Sexual dimorphism, [SDV.AEN] Life Sciences [q-bio]/Food and Nutrition, 03 medical and health sciences, 0302 clinical medicine, Endocrinology, [SDV.TOX]Life Sciences [q-bio]/Toxicology, 030220 oncology & carcinogenesis, Internal medicine, Constitutive androstane receptor, medicine, Endocrine system, lcsh:Q, lcsh:Science, Author Correction, [SDV.AEN]Life Sciences [q-bio]/Food and Nutrition, ComputingMilieux_MISCELLANEOUS, 030304 developmental biology
Abstract: Metabolic diseases such as obesity, type II diabetes and hepatic steatosis are a public health concern in developed countries. The metabolic risk is gender-dependent. The constitutive androstane receptor (CAR), which is at the crossroads between energy metabolism and endocrinology, has recently emerged as a promising therapeutic agent for the treatment of obesity and type 2 diabetes. In this study we sought to determine its role in the dimorphic regulation of energy homeostasis. We tracked male and female WT and CAR deficient (CAR-/-) mice for over a year. During aging, CAR-/- male mice developed hypercortisism, obesity, glucose intolerance, insulin insensitivity, dyslipidemia and hepatic steatosis. Remarkably, the latter modifications were absent, or minor, in female CAR-/- mice. When ovariectomized, CAR-/- female mice developed identical patterns of metabolic disorders as observed in male mice. These results highlight the importance of steroid hormones in the regulation of energy metabolism by CAR. They unveil a sexually dimorphic role of CAR in the maintenance of endocrine and metabolic homeostasis underscoring the importance of considering sex in treatment of metabolic diseases.
Published: 2020

37. Patulin transformation products and last intermediates in its biosynthetic pathway, E- and Z-ascladiol, are not toxic to human cells

Author: Joanna Tannous, Isabelle P. Oswald, Thierry Gauthier, Rhoda El Khoury, Cécile Canlet, Philippe Pinton, Selma P. Snini, Ali Atoui, André El Khoury, Ting Zhou, Roger Lteif, Yannick Lippi, Olivier Puel, Imourana Alassane-Kpembi, ToxAlim (ToxAlim), Institut National de la Recherche Agronomique (INRA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole Nationale Vétérinaire de Toulouse (ENVT), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Faculté des Sciences, Centre d’Analyses et de Recherches, Université Saint-Joseph de Beyrouth (USJ), Analyse de Xénobiotiques, Identification, Métabolisme (E20 Metatoul-AXIOM), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Recherche Agronomique (INRA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-MetaToul-MetaboHUB, Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Biosynthèse & Toxicité des Mycotoxines (ToxAlim-BioToMyc), Transcriptomic impact of Xenobiotics (E23 TRiX), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Plateforme Génome & Transcriptome (GET), Contaminants & Stress Cellulaire (ToxAlim-COMICS), Lebanese Atomic Energy Commission, Centre National de la Recherche Scientifique (CNRS), Faculty of Sciences, Laboratory of Microbiology, Department of Biology, Lebanese University [Beirut] (LU), Guelph Research and Development Center, Agriculture and Agri-Food [Ottawa] (AAFC), project CASDAR AAP RT 2015 No. 1523, Université Fédérale Toulouse Midi-Pyrénées-Ecole Nationale Vétérinaire de Toulouse (ENVT), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Recherche Agronomique (INRA), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Recherche Agronomique (INRA)-MetaToul-MetaboHUB, Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Recherche Agronomique (INRA)-Plateforme Génome & Transcriptome (GET), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Ecole Nationale Vétérinaire de Toulouse (ENVT), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut National de la Santé et de la Recherche Médicale (INSERM), and Lebanese University [Beirut]
Subjects: 0301 basic medicine, penicillium expansum, Cell Survival, [SDV]Life Sciences [q-bio], Health, Toxicology and Mutagenesis, Genes, Fungal, 030106 microbiology, Mutant, toxicologie alimentaire, HL-60 Cells, Biology, Toxicology, Patulin, 03 medical and health sciences, chemistry.chemical_compound, Isomerism, Humans, Furans, Cytotoxicity, Mycotoxin, Dose-Response Relationship, Drug, ATP synthase, Microarray analysis techniques, Penicillium, patulin synthase, patuline, Hep G2 Cells, General Medicine, biology.organism_classification, patE gene, HEK293 Cells, 030104 developmental biology, chemistry, Biochemistry, Organ Specificity, Cell culture, biology.protein, cytotoxicity, microarray analysis, Caco-2 Cells, Penicillium expansum, ascladiol, Gene Deletion
Abstract: Patulin is the main mycotoxin contaminating apples. During the brewing of alcoholic beverages, this mycotoxin is degraded to ascladiol, which is also the last precursor of patulin. The present study aims (1) to characterize the last step of the patulin biosynthetic pathway and (2) to describe the toxicity of ascladiol. A patE deletion mutant was generated in Penicillium expansum. In contrast to the wild strain, this mutant does not produce patulin but accumulates high levels of E-ascladiol with few traces of Z-ascladiol. This confirms that patE encodes the patulin synthase involved in the conversion of E-ascladiol to patulin. After purification, cytotoxicities of patulin and E- and Z-ascladiol were investigated on human cell lines from liver, kidney, intestine, and immune system. Patulin was cytotoxic for these four cell lines in a dose-dependent manner. By contrast, both E- and Z-ascladiol were devoid of cytotoxicity. Microarray analyses on human intestinal cells treated with patulin and E-ascladiol showed that the latter, unlike patulin, did not alter the whole human transcription. These results demonstrate that E- and Z-ascladiol are not toxic and therefore patulin detoxification strategies leading to the accumulation of ascladiol are good approaches to limit the patulin risk.
Published: 2016

38. Gene Expression Profiling Reveals that PXR Activation Inhibits Hepatic PPARα Activity and Decreases FGF21 Secretion in Male C57Bl6/J Mice

Author: Tiffany Fougeray, Marion Régnier, Nicolas Loiseau, Colette Bétoulières, Yannick Lippi, Arnaud Polizzi, Hervé Guillou, Laila Mselli-Lakhal, Céline Lukowicz, Frédéric Lasserre, Claire Naylies, Anne Fougerat, Sharon Barretto, Laurence Gamet-Payrastre, Sarra Smati, Sandrine Ellero-Simatos, Lorraine Smith, ToxAlim (ToxAlim), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Ecole Nationale Vétérinaire de Toulouse (ENVT), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Recherche Agronomique (INRA), Toxicologie Intégrative & Métabolisme (ToxAlim-TIM), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Recherche Agronomique (INRA)-Université Toulouse III - Paul Sabatier (UT3), Transcriptomic impact of Xenobiotics (E23 TRiX), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Recherche Agronomique (INRA)-Plateforme Génome & Transcriptome (GET), Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole Nationale Vétérinaire de Toulouse (ENVT), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Plateforme Ezop (Ezop), Exposition, Perturbation Endocrino-métabolique et Reproduction (ToxAlim-EXPER), Region Occitanie, INRA AlimH department, Agence Nationale de la Recherche (ANR), Fond Europeen de Developpement Regional (FEDER), Joint Programming Initiative (JPI), Institut National de la Recherche Agronomique (INRA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Plateforme Génome & Transcriptome (GET), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), and ElleroSsimatos, Sandrine
Subjects: Male, FGF21, nuclear receptors, Energy homeostasis, Transcriptome, lcsh:Chemistry, transcriptomics, 0302 clinical medicine, Receptor, lcsh:QH301-705.5, Spectroscopy, 0303 health sciences, Pregnane X receptor, hepatokines, Chemistry, Pregnane X Receptor, General Medicine, 3. Good health, Computer Science Applications, Cell biology, Liver, Pregnenolone, medicine.drug, Transcriptional Activation, digestive system, Catalysis, Article, Inorganic Chemistry, 03 medical and health sciences, Autre (Chimie), medicine, Animals, PPAR alpha, Physical and Theoretical Chemistry, Molecular Biology, 030304 developmental biology, Gene Expression Profiling, Organic Chemistry, digestive system diseases, Gene expression profiling, Fibroblast Growth Factors, Mice, Inbred C57BL, Nuclear receptor, lcsh:Biology (General), lcsh:QD1-999, Other, [CHIM.OTHE]Chemical Sciences/Other, 030217 neurology & neurosurgery, Gene Deletion
Abstract: The pregnane X receptor (PXR) is the main nuclear receptor regulating the expression of xenobiotic-metabolizing enzymes and is highly expressed in the liver and intestine. Recent studies have highlighted its additional role in lipid homeostasis, however, the mechanisms of these regulations are not fully elucidated. We investigated the transcriptomic signature of PXR activation in the liver of adult wild-type vs. Pxr-/- C57Bl6/J male mice treated with the rodent specific ligand pregnenolone 16&alpha, carbonitrile (PCN). PXR activation increased liver triglyceride accumulation and significantly regulated the expression of 1215 genes, mostly xenobiotic-metabolizing enzymes. Among the down-regulated genes, we identified a strong peroxisome proliferator-activated receptor &alpha, (PPAR&alpha, ) signature. Comparison of this signature with a list of fasting-induced PPAR&alpha, target genes confirmed that PXR activation decreased the expression of more than 25 PPAR&alpha, target genes, among which was the hepatokine fibroblast growth factor 21 (Fgf21). PXR activation abolished plasmatic levels of FGF21. We provide a comprehensive signature of PXR activation in the liver and identify new PXR target genes that might be involved in the steatogenic effect of PXR. Moreover, we show that PXR activation down-regulates hepatic PPAR&alpha, activity and FGF21 circulation, which could participate in the pleiotropic role of PXR in energy homeostasis.
Published: 2019

39. Gene Expression Profiling Reveals That PXR Activation Inhibits Hepatic PPARα Activity and Decreases FGF21 Secretion in Male C57Bl6/J Mice

Author: Nicolas Loiseau, Anne Fougerat, Hervé Guillou, Arnaud Polizzi, Sharon Barretto, Claire Naylies, Laurence Payrastre, Sandrine Ellero-Simatos, Laila Lakhal, Tiffany Fougeray, Céline Lukowicz, Frédéric Lasserre, Lorraine Smith, Marion Régnier, Yannick Lippi, Sarra Smati, and Colette Bétoulières
Subjects: C57bl6 j, Gene expression profiling, Transcriptome, Pregnane X receptor, FGF21, Nuclear receptor, Chemistry, other, Secretion, digestive system, digestive system diseases, Cell biology
Abstract: The pregnane X receptor (PXR) is the main nuclear receptor regulating the expression of xenobiotic metabolizing enzymes and is highly expressed in the liver and intestine. Recent studies have highlighted its additional role in lipid homeostasis, however, the mechanisms of these regulations are not fully elucidated. We investigated the transcriptomic signature of PXR activation in the liver of adult wild-type vs Pxr-/- C57Bl6/J male mice treated with the rodent specific ligand pregnenolone 16α-carbonitrile (PCN). PXR activation increased liver triglyceride accumulation and significantly regulated the expression of 1215 genes mostly xenobiotic metabolizing enzymes. Among the down-regulated genes, we identified a strong peroxisome proliferator-activated receptor α (PPARα) signature. Comparison of this signature with a list of fasting-induced PPARα target genes confirmed that PXR activation decreased the expression of more than 25 PPARα target genes, among which the hepatokine fibroblast growth factor 21 (Fgf21). PXR activation abolished plasmatic levels of FGF21. We provide a comprehensive signature of PXR activation in the liver and identify new PXR target genes that might be involved in the steatogenic effect of PXR. Moreover, we show that PXR activation down-regulates hepatic PPARα activity and FGF21 circulation, which could participate in the pleiotropic role of PXR in energy homeostasis.
Published: 2019

40. Hepatocyte-specific deletion of Pparα promotes NASH in the context of obesity

Author: Arnaud Polizzi, Marie Tremblay-Franco, Frédéric Lasserre, Anne Fougerat, Hervé Guillou, Aurélie Batut, Catherine Postic, Justine Bertrand-Michel, Marion Régnier, Walter Wahli, Edwin Fouché, Nicolas Loiseau, Yannick Lippi, Claire Naylies, Céline Lukowicz, Talal Al Saati, Sandrine Ellero-Simatos, Alexandra Montagner, Dominique Langin, Valentin Barquissau, Cécile Canlet, Sarra Smati, Etienne Mouisel, and Colette Bétoulières
Subjects: chemistry.chemical_classification, medicine.medical_specialty, business.industry, nutritional and metabolic diseases, Fatty acid, Peroxisome proliferator-activated receptor, Inflammation, medicine.disease, Endocrinology, medicine.anatomical_structure, chemistry, Lipid oxidation, Fibrosis, Internal medicine, Hepatocyte, Medicine, Steatohepatitis, medicine.symptom, Steatosis, business
Abstract: ObjectivesPeroxisome proliferator activated receptor α (PPARα) acts as a fatty acid sensor to orchestrate the transcription of genes coding for rate-limiting enzymes required for lipid oxidation in hepatocytes. Mice only lacking Pparα in hepatocytes spontaneously develop steatosis without obesity in aging. Altough steatosis is a benign condition it can develop into non alcoholic steatohepatitis (NASH), which may progress to irreversible damage, such as fibrosis and hepatocarcinoma. While NASH appears as a major public health concern worldwide, it remains an unmet medical need. Several drugs are being tested in clinical trials, including pharmacological agonists for the different PPAR isotypes. In current study, we investigated the role of hepatocyte PPARα in a preclinical model of steatosis.Methods/ResultsWe have investigated the role of hepatocyte PPARα in a preclinical model of steatosis using High Fat Diet (HFD) feeding as a model of obesity in C57BL/6J male Wild-Type mice (WT), in whole-body (Pparα-/-) mice and in mice lacking Pparα in hepatocyte (Pparαhep-/-). We provide evidence that Pparα deletion in hepatocytes promotes NASH in mice fed an HFD. This enhanced NASH susceptibility occurs without development of glucose intolerance. Moreover, our data reveal that non-hepatocytic PPARα activity predominantly contributes to the metabolic response to HFD.ConclusionTaken together, our data support hepatocyte PPARα as being essential to the prevention of steatosis progression to NASH and that extra-hepatocyte PPARα activity contributes to whole-body lipid homeostasis.HighlightsPparα deletion in hepatocytes promotes steatosis and inflammation in HFD-induced obesityHepatocyte-specific deletion of Pparα dissociates NAFLD from glucose intolerance in HFD-induced obesity obesityExtrahepatic PPARα activity contributes to the metabolic response to HFD-induced obesity
Published: 2018

41. Impact d’une exposition alimentaire chronique au glyphosate à des doses de référence sur le microbiote intestinal et le métabolisme énergétique chez la souris

Author: Nicolas Loiseau, Arnaud Polizzi, Claudia Martin, Yannick Lippi, Cécile Canlet, M. von Bergen, Anne Fougerat, Frédéric Lasserre, Sandrine Ellero-Simatos, L. Payastre, Ulrike Rolle-Kampczyk, Lorraine Smith, Beatrice Engelmann, H. Guillou, and W. Klément
Subjects: Nutrition and Dietetics, Endocrinology, Diabetes and Metabolism, Internal Medicine
Abstract: Introduction et but de l’etude Le glyphosate est l’herbicide le plus vendu en France. Son usage intensif est associe a l’exposition chronique de l’homme via l’eau et l’alimentation. La molecule agit en inhibant l’EPSPS, une enzyme indispensable aux plantes mais aussi a de nombreuses bacteries pour la synthese d’acides amines. Cette enzyme est retrouvee dans la majorite des bacteries presentes dans notre microbiote et differentes etudes ont demontre des effets off-target du glyphosate sur le microbiote du sol, des volailles et des abeilles. Le microbiote intestinal joue un role cle dans le metabolisme energetique et l’immunite. En effet, les dysbioses sont associees a des maladies metaboliques telles que l’obesite, le diabete ou la steatose hepatique non-alcoolique. Nous emettons l’hypothese qu’une exposition chronique au glyphosate peut impacter la composition et/ou l’activite du microbiote intestinal et que cela pourrait perturber ses fonctions physiologiques. Nous avons donc etudie l’impact d’une exposition chronique au glyphosate a des doses de reference reglementaires sur le microbiote intestinal et le metabolisme energetique de la souris. Materiel et methodes Des souris femelles C57Bl6/J ont ete exposees a des regimes controle ou enrichis en glyphosate a 2 doses de reference, la DJA et la NOAEL, pendant les periodes de gestation et lactation. Leurs descendants (F1) mâles et femelles ont ensuite ete exposes au meme regime que leur mere pendant 10 semaines. Des parametres metaboliques (poids, consommation alimentaire et hydrique, tolerance au glucose) ont ete evalues et les urines recoltees, dans lesquelles la mesure du glyphosate a ete effectuee. Le metabolisme et l’activite du microbiote intestinal ont ete evalues par differentes approches (sequencage 16S, metabolomique, analyses biochimique, transcriptomique et histologique). Resultats et analyse statistique L’exposition des animaux aux 2 doses de glyphosate a ete confirmee par LC/MS urinaire. Les F1 mâles et femelles exposes au glyphosate ont montre une augmentation du poids des caecums et des changements de la composition du microbiote intestinal par rapport aux animaux controles. L’exposition des animaux a induit une perturbation des profils metaboliques urinaires chez les 2 sexes ainsi qu’une diminution des taux circulants d’acides gras libres et de triglycerides. Dans le foie, les analyses transcriptomiques ont montre des perturbations d’un grand nombre de genes impliques dans la lipogenese de novo dans les 2 sexes et aux 2 doses d’exposition, sans changement des niveaux de lipides neutres. Des analyses complementaires sont en cours. Conclusion Ces etudes apportent des elements nouveaux a prendre en consideration lors des etudes reglementaires sur ce pesticide largement utilise dans le monde.
Published: 2021

42. Patulin is a cultivar-dependent aggressiveness factor favouring the colonization of apples byPenicillium expansum

Author: Joanna Tannous, Sylviane Bailly, Pauline Heuillard, Olivier Puel, Christian Barreau, Enric Zehraoui, Selma P. Snini, Yannick Lippi, and Isabelle P. Oswald
Subjects: 0301 basic medicine, Malus, Strain (chemistry), fungi, 030106 microbiology, Mutant, food and beverages, Soil Science, Virulence, Plant Science, Biology, biology.organism_classification, Microbiology, Patulin, 03 medical and health sciences, chemistry.chemical_compound, chemistry, Penicillium, bacteria, Penicillium expansum, Mycotoxin, Agronomy and Crop Science, Molecular Biology
Abstract: The blue mould decay of apples is caused by Penicillium expansum and is associated with contamination by patulin, a worldwide regulated mycotoxin. Recently, a cluster of 15 genes (patA-patO) involved in patulin biosynthesis was identified in P. expansum. blast analysis revealed that patL encodes a Cys6 zinc finger regulatory factor. The deletion of patL caused a drastic decrease in the expression of all pat genes, leading to an absence of patulin production. Pathogenicity studies performed on 13 apple varieties indicated that the PeΔpatL strain could still infect apples, but the intensity of symptoms was weaker compared with the wild-type strain. A lower growth rate was observed in the PeΔpatL strain when this strain was grown on nine of the 13 apple varieties tested. In the complemented PeΔpatL:patL strain, the ability to grow normally in apple and the production of patulin were restored. Our results clearly demonstrate that patulin is not indispensable in the initiation of the disease, but acts as a cultivar-dependent aggressiveness factor for P. expansum. This conclusion was strengthened by the fact that the addition of patulin to apple infected by the PeΔpatL mutant restored the normal fungal colonization in apple.
Published: 2015

43. The protective role of liver X receptor (LXR) during fumonisin B1-induced hepatotoxicity

Author: Marion Régnier, Talal Al Saati, Sarra Smati, Arnaud Polizzi, Yannick Lippi, Colette Bétoulières, Joëlle Laffitte, Hervé Guillou, Hester Mari Burger, Simon Ducheix, Frédéric Lasserre, Alexandra Montagner, Pascal Gourbeyre, Claire Naylies, Justine Bertrand-Michel, Sandrine Ménard, Isabelle P. Oswald, Nicolas Loiseau, Céline Lukowicz, Wentzel C. A. Gelderblom, Jean-Marc A. Lobaccaro, Sandrine Ellero-Simatos, ToxAlim (ToxAlim), Institut National de la Recherche Agronomique (INRA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole Nationale Vétérinaire de Toulouse (ENVT), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Toxicologie Intégrative & Métabolisme (ToxAlim-TIM), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Recherche Agronomique (INRA)-Université Toulouse III - Paul Sabatier (UT3), Institut National de la Santé et de la Recherche Médicale (INSERM), Transcriptomic impact of Xenobiotics (E23 TRiX), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Plateforme Génome & Transcriptome (GET), Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Biosynthèse & Toxicité des Mycotoxines (ToxAlim-BioToMyc), Plateforme Ezop (Ezop), Neuro-Gastroentérologie & Nutrition (ToxAlim-NGN), Génétique, Reproduction et Développement (GReD), Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Institut National de la Santé et de la Recherche Médicale (INSERM), Cape Peninsula University of Technology (CPUT), Department of Biochemistry, Hôpital Lapeyronie, Ministere de l'Education Nationale, de la Recherche et de la Technologie, ANR Fumolip [ANR-16-CE21-0003], ANR LipoReg, France [ANR-15-Carn0016], Université de Toulouse (UT)-Université de Toulouse (UT)-Ecole Nationale Vétérinaire de Toulouse (ENVT), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Ecole d'Ingénieurs de Purpan (INP - PURPAN), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Institut des Maladies Métaboliques et Casdiovasculaires (UPS/Inserm U1297 - I2MC), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National de la Santé et de la Recherche Médicale (INSERM), Centre Hospitalier Universitaire de Toulouse (CHU Toulouse), MetaboHUB-MetaToul, MetaboHUB-Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université de Toulouse (UT)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Centre Régional d'Exploration Fonctionnelle et Ressources Expérimentales (CREFRE), Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), Stellenbosch University, ANR-16-CE21-0003,Fumolip,Toxicité d'un contaminant alimentaire majeur, la fumonisine: rôle du métabolisme lipidique et stratégie nutritionnelle de détoxication(2016), Université Fédérale Toulouse Midi-Pyrénées-Ecole Nationale Vétérinaire de Toulouse (ENVT), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Recherche Agronomique (INRA), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Recherche Agronomique (INRA)-Plateforme Génome & Transcriptome (GET), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)
Subjects: 0301 basic medicine, medicine.drug_class, Health, Toxicology and Mutagenesis, 010501 environmental sciences, Pharmacology, Toxicology, 01 natural sciences, digestive system, Fumonisins, Intestinal absorption, Nephrotoxicity, Transaminase, Ceramide, 03 medical and health sciences, chemistry.chemical_compound, medicine, Animals, Aspartate Aminotransferases, Liver X receptor, 0105 earth and related environmental sciences, Liver X Receptors, Mice, Knockout, Fumonisin B1, Sphingolipids, Bile acid, Chemistry, Hepatotoxicity, Fumonisin, food and beverages, Alanine Transaminase, General Medicine, 3. Good health, Mice, Inbred C57BL, 030104 developmental biology, Nuclear receptor, Gene Expression Regulation, Liver, [SDV.TOX]Life Sciences [q-bio]/Toxicology, Toxicity, lipids (amino acids, peptides, and proteins), LXR, Female, Chemical and Drug Induced Liver Injury, [SDV.AEN]Life Sciences [q-bio]/Food and Nutrition
Abstract: International audience; Fumonisin B1 (FB1), a congener of fumonisins produced by Fusarium species, is the most abundant and most toxicologically active fumonisin. FB1 causes severe mycotoxicosis in animals, including nephrotoxicity, hepatotoxicity, and disruption of the intestinal barrier. However, mechanisms associated with FB1 toxicity are still unclear. Preliminary studies have highlighted the role of liver X receptors (LXRs) during FB1 exposure. LXRs belong to the nuclear receptor family and control the expression of genes involved in cholesterol and lipid homeostasis. In this context, the toxicity of FB1 was compared in female wild-type (LXR+/+) and LXR, double knockout (LXR-/-) mice in the absence or presence of FB1 (10mg/kg body weight/day) for 28days. Exposure to FB1 supplemented in the mice's drinking water resulted in more pronounced hepatotoxicity in LXR-/- mice compared to LXR+/+ mice, as indicated by hepatic transaminase levels (ALT, AST) and hepatic inflammatory and fibrotic lesions. Next, the effect of FB1 exposure on the liver transcriptome was investigated. FB1 exposure led to a specific transcriptional response in LXR-/- mice that included altered cholesterol and bile acid homeostasis. ELISA showed that these effects were associated with an elevated FB1 concentration in the plasma of LXR-/- mice, suggesting that LXRs participate in intestinal absorption and/or clearance of the toxin. In summary, this study demonstrates an important role of LXRs in protecting the liver against FB1-induced toxicity, suggesting an alternative mechanism not related to the inhibition of sphingolipid synthesis for mycotoxin toxicity.
Published: 2018

44. Saccharomyces cerevisiae boulardii Reduces the Deoxynivalenol-Induced Alteration of the Intestinal Transcriptome

Author: Mathieu Castex, Manon Neves, Sylvie Combes, Yannick Lippi, Isabelle P. Oswald, Jean-François Hupé, Philippe Pinton, Imourana Alassane-Kpembi, ToxAlim (ToxAlim), Institut National de la Recherche Agronomique (INRA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole Nationale Vétérinaire de Toulouse (ENVT), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Centre National Hospitalier et Universitaire Hubert Koutoukou Maga de Cotonou, Partenaires INRAE, Biosynthèse & Toxicité des Mycotoxines (ToxAlim-BioToMyc), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Recherche Agronomique (INRA)-Université Toulouse III - Paul Sabatier (UT3), Lallemand S.A.S., Transcriptomic impact of Xenobiotics (E23 TRiX), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Plateforme Génome & Transcriptome (GET), Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Génétique Physiologie et Systèmes d'Elevage (GenPhySE ), École nationale supérieure agronomique de Toulouse [ENSAT]-Institut National de la Recherche Agronomique (INRA)-Ecole Nationale Vétérinaire de Toulouse (ENVT), Université Fédérale Toulouse Midi-Pyrénées-Ecole Nationale Vétérinaire de Toulouse (ENVT), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Recherche Agronomique (INRA), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Recherche Agronomique (INRA)-Plateforme Génome & Transcriptome (GET), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)
Subjects: 0301 basic medicine, Male, Swine, Health, Toxicology and Mutagenesis, p38 mitogen-activated protein kinases, [SDV]Life Sciences [q-bio], Saccharomyces cerevisiae, Trichothecene, deoxynivalenol, lcsh:Medicine, Ascorbic Acid, Toxicology, medicine.disease_cause, p38 Mitogen-Activated Protein Kinases, Article, Antioxidants, Transcriptome, 03 medical and health sciences, lipid, Gene expression, medicine, oxidative stress, Animals, [INFO]Computer Science [cs], Saccharomyces cerevisiae boulardii CNCM I-1079, intestine, [SDV.GEN]Life Sciences [q-bio]/Genetics, biology, lcsh:R, biology.organism_classification, Lipid Metabolism, saccharomyce cerevisiae boulardii CNCM 1-1079, transcriptome, inflammation, Yeast, 3. Good health, Cell biology, lipid metabolism, [SDV.GEN.GA]Life Sciences [q-bio]/Genetics/Animal genetics, 030104 developmental biology, Jejunum, Signal transduction, Trichothecenes, Oxidative stress, Signal Transduction
Abstract: International audience; Type B trichothecene mycotoxin deoxynivalenol (DON) is one of the most frequently occurring food contaminants. By inducing trans-activation of a number of pro-inflammatory cytokines and increasing the stability of their mRNA, trichothecene can impair intestinal health. Several yeast products, especially Saccharomyces cerevisiae, have the potential for improving the enteric health of piglets, but little is known about the mechanisms by which the administration of yeast counteracts the DON-induced intestinal alterations. Using a pig jejunum explant model, a whole-transcriptome analysis was performed to decipher the early response of the small intestine to the deleterious effects of DON after administration of S. cerevisiae boulardii strain CNCM I-1079. Compared to the control condition, no differentially expressed gene (DE) was observed after treatment by yeast only. By contrast, 3619 probescorresponding to 2771 geneswere differentially expressed following exposure to DON, and 32 signaling pathways were identified from the IPA software functional analysis of the set of DE genes. When the intestinal explants were treated with S. cerevisiae boulardii prior to DON exposure, the number of DE genes decreased by half (1718 probes corresponding to 1384 genes). Prototypical inflammation signaling pathways triggered by DON, including NF-B and p38 MAPK, were reversed, although the yeast demonstrated limited efficacy toward some other pathways. S. cerevisiae boulardii also restored the lipid metabolism signaling pathway, and reversed the down-regulation of the antioxidant action of vitamin C signaling pathway. The latter effect could reduce the burden of DON-induced oxidative stress. Altogether, the results show that S. cerevisiae boulardii reduces the DON-induced alteration of intestinal transcriptome, and point to new mechanisms for the healing of tissue injury by yeast.
Published: 2018

45. Metabolic effects of a chronic dietary exposure to a low-dose oesticide cocktail in mice: Sexual dimorphism and role of the constitutive androstane receptor

Author: Jean-François Martin, Arnaud Polizzi, Hervé Guillou, Céline Lukowicz, Emilien L. Jamin, Cécile Canlet, Nicolas Loiseau, Laurent Debrauwer, Justine Bertrand-Michel, Vassilia Theodorou, Laurence Gamet-Payrastre, Talal Al Saati, Claire Naylies, Laila Mselli-Lakhal, Sandrine Ellero-Simatos, Alexandra Montagner, Marion Régnier, Yannick Lippi, Frédéric Lasserre, ToxAlim (ToxAlim), Institut National de la Recherche Agronomique (INRA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole Nationale Vétérinaire de Toulouse (ENVT), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Toxicologie Intégrative & Métabolisme (ToxAlim-TIM), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Recherche Agronomique (INRA)-Université Toulouse III - Paul Sabatier (UT3), Transcriptomic impact of Xenobiotics (E23 TRiX), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Plateforme Génome & Transcriptome (GET), Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Analyse de Xénobiotiques, Identification, Métabolisme (E20 Metatoul-AXIOM), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-MetaToul-MetaboHUB, MetaboHUB, Institut des Maladies Métaboliques et Cardiovasculaires (I2MC), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM), Institut National de la Santé et de la Recherche Médicale (INSERM), Neuro-Gastroentérologie & Nutrition (ToxAlim-NGN), Exposition, Perturbation Endocrino-métabolique et Reproduction (ToxAlim-EXPER), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-MetaboHUB-MetaToul, ProdInra, Migration, Université Fédérale Toulouse Midi-Pyrénées-Ecole Nationale Vétérinaire de Toulouse (ENVT), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Recherche Agronomique (INRA), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Recherche Agronomique (INRA)-Plateforme Génome & Transcriptome (GET), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), and Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Recherche Agronomique (INRA)-MetaToul-MetaboHUB
Subjects: 0301 basic medicine, Male, Insecticides, Health, Toxicology and Mutagenesis, [SDV]Life Sciences [q-bio], Physiology, Receptors, Cytoplasmic and Nuclear, 010501 environmental sciences, 01 natural sciences, Animals, Genetically Modified, Dietary Exposure, 03 medical and health sciences, chemistry.chemical_compound, Mice, Sex Factors, Glucose Metabolism Disorder, Constitutive androstane receptor, medicine, Metabolome, Animals, Receptor, Toxicity Tests, Chronic, Constitutive Androstane Receptor, 0105 earth and related environmental sciences, Glucose Metabolism Disorders, business.industry, Research, Fatty liver, Body Weight, Public Health, Environmental and Occupational Health, Glutathione, Pesticide, medicine.disease, Fungicides, Industrial, Sexual dimorphism, Fatty Liver, Mice, Inbred C57BL, [SDV] Life Sciences [q-bio], 030104 developmental biology, chemistry, Liver, Inactivation, Metabolic, Female, business
Abstract: Background: Epidemiological evidence suggests a link between pesticide exposure and the development of metabolic diseases. However, most experimental studies have evaluated the metabolic effects of pesticides using individual molecules, often at nonrelevant doses or in combination with other risk factors such as high-fat diets. Objectives: We aimed to evaluate, in mice, the metabolic consequences of chronic dietary exposure to a pesticide mixture at nontoxic doses, relevant to consumers’ risk assessment. Methods: A mixture of six pesticides commonly used in France, i.e., boscalid, captan, chlorpyrifos, thiofanate, thiacloprid, and ziram, was incorporated in a standard chow at doses exposing mice to the tolerable daily intake (TDI) of each pesticide. Wild-type (WT) and constitutive androstane receptor–deficient (CAR−/−) male and female mice were exposed for 52 wk. We assessed metabolic parameters [body weight (BW), food and water consumption, glucose tolerance, urinary metabolome] throughout the experiment. At the end of the experiment, we evaluated liver metabolism (histology, transcriptomics, metabolomics, lipidomics) and pesticide detoxification using liquid chromatography–mass spectrometry (LC-MS). Results: Compared to those fed control chow, WT male mice fed pesticide chow had greater BW gain and more adiposity. Moreover, these WT males fed pesticide chow exhibited characteristics of hepatic steatosis and glucose intolerance, which were not observed in those fed control chow. WT exposed female mice exhibited fasting hyperglycemia, higher reduced glutathione (GSH):oxidized glutathione (GSSG) liver ratio and perturbations of gut microbiota–related urinary metabolites compared to WT mice fed control chow. When we performed these experiments on CAR−/− mice, pesticide-exposed CAR−/− males did not exhibit BW gain or changes in glucose metabolism compared to the CAR−/− males fed control chow. Moreover, CAR−/− females fed pesticide chow exhibited pesticide toxicity with higher BWs and mortality rate compared to the CAR−/− females fed control chow. Conclusions: To our knowledge, we are the first to demonstrate a sexually dimorphic obesogenic and diabetogenic effect of chronic dietary exposure to a common mixture of pesticides at TDI levels, and to provide evidence for a partial role for CAR in an in vivo mouse model. This raises questions about the relevance of TDI for individual pesticides when present in a mixture. https://doi.org/10.1289/EHP2877
Published: 2018

46. Time course study of the response to LPS targeting the pig immune gene networks

Author: Darya Bazovkina, Laure Gress, Laurence Liaubet, Pierre Mormède, Valérie Sautron, Nathalie Villa-Vialaneix, Elena Terenina, Caroline Ydier, Yannick Lippi, Amélie Sevin-Pujol, Yvon Billon, Claire Naylies, Génétique Physiologie et Systèmes d'Elevage (GenPhySE ), École nationale supérieure agronomique de Toulouse [ENSAT]-Institut National de la Recherche Agronomique (INRA)-Ecole Nationale Vétérinaire de Toulouse (ENVT), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Russian Academy of Science, Siberian Branch, Department of Behavioral Neurogenomics, Partenaires INRAE, Transcriptomic impact of Xenobiotics (E23 TRiX), ToxAlim (ToxAlim), Institut National de la Recherche Agronomique (INRA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole Nationale Vétérinaire de Toulouse (ENVT), Université Fédérale Toulouse Midi-Pyrénées-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Recherche Agronomique (INRA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Plateforme Génome & Transcriptome (GET), Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Génétique, Expérimentation et Système Innovants (GenESI), Institut National de la Recherche Agronomique (INRA), Unité de Mathématiques et Informatique Appliquées de Toulouse (MIAT INRA), ANR-12-ADAP-0008, Région Midi-Pyrénées, Embassy of France in Russia (Mechnikov Program)., Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), and Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)
Subjects: Lipopolysaccharides, Male, 0301 basic medicine, Candidate gene, Stress, Hypothalamic, pituitary-adrenal (HPA) axis, Cortisol, Time-course, Systems biology, Microarray, Pig, PORCINE PBMCS, SIGNIFICANTLY INFLUENCES, TRANSCRIPTOMIC ANALYSIS, MOLECULAR-GENETICS, GROWING PIGS, EXPRESSION, INNATE, SWINE, LIPOPOLYSACCHARIDE, ACTIVATION, Hydrocortisone, Lipopolysaccharide, Swine, [SDV]Life Sciences [q-bio], chemistry.chemical_compound, 0302 clinical medicine, Gene Regulatory Networks, [MATH]Mathematics [math], Hypothalamic-pituitary-adrenal (HPA) axis, Whole blood, 2. Zero hunger, medicine.anatomical_structure, Female, medicine.symptom, Research Article, Biotechnology, medicine.drug, lcsh:QH426-470, lcsh:Biotechnology, Inflammation, Biology, 03 medical and health sciences, lcsh:TP248.13-248.65, White blood cell, Genetics, medicine, Animals, [INFO]Computer Science [cs], [SDV.GEN]Life Sciences [q-bio]/Genetics, Gene Expression Profiling, Immunity, Blood Cell Count, Gene expression profiling, lcsh:Genetics, [SDV.GEN.GA]Life Sciences [q-bio]/Genetics/Animal genetics, Kinetics, 030104 developmental biology, chemistry, Immunology, Transcriptome, 030217 neurology & neurosurgery
Abstract: Background Stress is a generic term used to describe non-specific responses of the body to all kinds of challenges. A very large variability in the response can be observed across individuals, depending on numerous conditioning factors like genetics, early influences and life history. As a result, there is a wide range of individual vulnerability and resilience to stress, also called robustness. The importance of robustness-related traits in breeding strategies is increasing progressively towards the production of animals with a high level of production under a wide range of climatic conditions and management systems, together with a lower environmental impact and a high level of animal welfare. The present study aims at describing blood transcriptomic, hormonal, and metabolic responses of pigs to a systemic challenge using lipopolysaccharide (LPS). The objective is to analyze the individual variation of the biological responses in relation to the activity of the HPA axis measured by the levels of plasma cortisol after LPS and ACTH in 120 juvenile Large White (LW) pigs. The kinetics of the response was measured with biological variables and whole blood gene expression at 4 time points. A multilevel statistical analysis was used to take into account the longitudinal aspect of the data. Results Cortisol level reaches its peak 4 h after LPS injection. The characteristic changes of white blood cell count to LPS were observed, with a decrease of total count, maximal at t=+4 h, and the mirror changes in the respective proportions of lymphocytes and granulocytes. The lymphocytes / granulocytes ratio was maximal at t=+1 h. An integrative statistical approach was used and provided a set of candidate genes for kinetic studies and ongoing complementary studies focused on the LPS-stimulated inflammatory response. Conclusions The present study demonstrates the specific biomarkers indicative of an inflammation in swine. Furthermore, these stress responses persist for prolonged periods of time and at significant expression levels, making them good candidate markers for evaluating the efficacy of anti-inflammatory drugs. Electronic supplementary material The online version of this article (doi:10.1186/s12864-017-4363-5) contains supplementary material, which is available to authorized users.
Published: 2017

47. A Specific ChREBP and PPARα Cross-Talk Is Required for the Glucose-Mediated FGF21 Response

Author: Anne-Françoise Burnol, Arnaud Polizzi, Marcio Do-Cruzeiro, Hervé Guillou, Emilie Tournier, Alison Iroz, Céline Lukowicz, Walter Wahli, Edwin Fouché, Solenne Marmier, Jean Girard, Renaud Dentin, Catherine Postic, Elodie Anthony, Fadila Benhamed, Françoise Levavasseur, Marion Régnier, Martine Daujat-Chavanieu, Yannick Lippi, Sandra Guilmeau, Véronique Fauveau, Sabine Gerbal-Chalouin, Michele Cauzac, Alexandra Montagner, Institut Cochin (IC UM3 (UMR 8104 / U1016)), Université Paris Descartes - Paris 5 (UPD5)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Université Fédérale Toulouse Midi-Pyrénées, ToxAlim (ToxAlim), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Ecole Nationale Vétérinaire de Toulouse (ENVT), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Recherche Agronomique (INRA), Cellules Souches, Plasticité Cellulaire, Médecine Régénératrice et Immunothérapies (IRMB), Centre Hospitalier Régional Universitaire [Montpellier] (CHRU Montpellier)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Montpellier (UM), Institut Cochin (UMR_S567 / UMR 8104), Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Descartes - Paris 5 (UPD5), Dentin, Renaud, Guillou, Hervé, Postic, Catherine, Toxicologie Intégrative & Métabolisme (ToxAlim-TIM), Institut National de la Recherche Agronomique (INRA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole Nationale Vétérinaire de Toulouse (ENVT), Université Fédérale Toulouse Midi-Pyrénées-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Recherche Agronomique (INRA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Prévention et promotion de la cancérogénèse par les aliments (ToxAlim-PPCA), Université de Montpellier (UM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre Hospitalier Régional Universitaire [Montpellier] (CHRU Montpellier), Transcriptomic impact of Xenobiotics (E23 TRiX), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Plateforme Génome & Transcriptome (GET), Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), H. Guillou's lab (TIM, ToxAlim) is supported by grants from Region Occitanie. W.W. was supported by a start-up grant from Lee Kong Chian School of Medicine, Nanyang Technological University. C. Postic's lab (U1016-Institut Cochin) is supported by grants from ChroME Network (Marie Curie Sklodowska Action H2020-MSCA-ITN-2015-675610), the Foundation for the Medical Research (FRM) (DEQ20150331744), and the European Foundation for the Study of Diabetes (EFSD) Novonordisk. H. Guillou's and C. Postic's labs are also supported by grants from the National Agency for Research (ANR) (ANR- 12BSV1-0025-ObeLiP and ANR -15-CE14-0026-Hepatokind). R. Dentin's lab (U1016-Institut Cochin) is supported by the European Research Council (ERC-2013-StG-336629) and the city of Paris (Projet Emergences-2011), Lee Kong Chian School of Medicine (LKCMedicine), Centre National de la Recherche Scientifique (CNRS)-Université Paris Descartes - Paris 5 (UPD5)-Institut National de la Santé et de la Recherche Médicale (INSERM), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Ecole Nationale Vétérinaire de Toulouse (ENVT), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut National de la Santé et de la Recherche Médicale (INSERM), and Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Recherche Agronomique (INRA)-Plateforme Génome & Transcriptome (GET)
Subjects: Male, 0301 basic medicine, medicine.medical_specialty, FGF21, ChREBP, [SDV]Life Sciences [q-bio], sucrose preference, toxicologie alimentaire, 030209 endocrinology & metabolism, Context (language use), Biology, Carbohydrate metabolism, Response Elements, Toxicology, PPARα, Toxicology and food chain, Article, General Biochemistry, Genetics and Molecular Biology, Mice, 03 medical and health sciences, 0302 clinical medicine, Internal medicine, Animals, Cells, Cultured, Female, Fibroblast Growth Factors/genetics, Fibroblast Growth Factors/metabolism, Glucose/metabolism, Hepatocytes/metabolism, Mice, Inbred C57BL, Nuclear Proteins/genetics, Nuclear Proteins/metabolism, PPAR alpha/genetics, PPAR alpha/metabolism, Transcription Factors/genetics, Transcription Factors/metabolism, glucose intake, medicine, PPAR alpha, Receptor, Carbohydrate-responsive element-binding protein, Transcription factor, lcsh:QH301-705.5, Toxicologie, Toxicologie et chaîne alimentaire, ComputingMilieux_MISCELLANEOUS, Basic Helix-Loop-Helix Leucine Zipper Transcription Factors, Nuclear Proteins, Fibroblast Growth Factors, Glucose, 030104 developmental biology, Endocrinology, Nuclear receptor, lcsh:Biology (General), Knockout mouse, Hepatocytes, Transcription Factors
Abstract: Summary While the physiological benefits of the fibroblast growth factor 21 (FGF21) hepatokine are documented in response to fasting, little information is available on Fgf21 regulation in a glucose-overload context. We report that peroxisome-proliferator-activated receptor α (PPARα), a nuclear receptor of the fasting response, is required with the carbohydrate-sensitive transcription factor carbohydrate-responsive element-binding protein (ChREBP) to balance FGF21 glucose response. Microarray analysis indicated that only a few hepatic genes respond to fasting and glucose similarly to Fgf21. Glucose-challenged Chrebp−/− mice exhibit a marked reduction in FGF21 production, a decrease that was rescued by re-expression of an active ChREBP isoform in the liver of Chrebp−/− mice. Unexpectedly, carbohydrate challenge of hepatic Pparα knockout mice also demonstrated a PPARα-dependent glucose response for Fgf21 that was associated with an increased sucrose preference. This blunted response was due to decreased Fgf21 promoter accessibility and diminished ChREBP binding onto Fgf21 carbohydrate-responsive element (ChoRE) in hepatocytes lacking PPARα. Our study reports that PPARα is required for the ChREBP-induced glucose response of FGF21., Graphical Abstract, Highlights • Fgf21 is a unique hepatic gene inducible by both catabolic and anabolic signals • The ChREBP-mediated induction of Fgf21 in hepatocytes requires PPARα • Loss of PPARα impairs Fgf21 promoter accessibility at the ChoRE • PPARα is required for the control of sucrose preference in vivo, FGF21 is a hepatokine with beneficial metabolic effects, including control of sucrose preference. Iroz et al. demonstrate that Fgf21 is a unique hepatic gene inducible by both fasting and glucose signals and that the transcription factors PPARα and ChREBP both regulate the endocrine control of sugar intake by hepatic FGF21.
Published: 2017

48. Large scale studies of the influence of GMO-based corn diet after 6 months of consumption in Wistar rats

Author: Cécile Canlet, Annick Moing, Jean-Philippe Antignac, Peter M. Rogowsky, Jean-Pierre Cravedi, Nathalie Arnich, Xavier Coumoul, Rémi Servien, Bérengère Broux, Laureline Berthelot, Nathalie Priymenko, Bernard Salles, Florence Forget, Bruno Corman, Bernard Jégou, Kadidiatou Dandere Abdoulkarim, Robert Barouki, Caroline Le Gall, Yannick Lippi, Laurent Ferrier, ToxAlim (ToxAlim), Institut National de la Recherche Agronomique (INRA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole Nationale Vétérinaire de Toulouse (ENVT), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Reproduction et développement des plantes (RDP), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de la Recherche Agronomique (INRA)-École normale supérieure - Lyon (ENS Lyon), Unité de recherche Mycologie et Sécurité des Aliments (MycSA), Institut National de la Recherche Agronomique (INRA), Biologie du fruit et pathologie (BFP), Université Bordeaux Segalen - Bordeaux 2-Institut National de la Recherche Agronomique (INRA)-Université Sciences et Technologies - Bordeaux 1, Prévention et promotion de la cancérogénèse par les aliments (ToxAlim-PPCA), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Recherche Agronomique (INRA)-Université Toulouse III - Paul Sabatier (UT3), Analyse de Xénobiotiques, Identification, Métabolisme (E20 Metatoul-AXIOM), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-MetaToul-MetaboHUB, Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Transcriptomic impact of Xenobiotics (E23 TRiX), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Plateforme Génome & Transcriptome (GET), Methodomics, U 699, Institut National de la Santé et de la Recherche Médicale (INSERM), Profilomic [Boulogne-Billancourt], Groupe d'Etude de la Reproduction Chez l'Homme et les Mammiferes (GERHM), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES), Laboratoire d'étude des Résidus et Contaminants dans les Aliments (LABERCA), Institut National de la Recherche Agronomique (INRA)-Ecole Nationale Vétérinaire, Agroalimentaire et de l'alimentation Nantes-Atlantique (ONIRIS), Toxicité environnementale, cibles thérapeutiques, signalisation cellulaire (T3S - UMR_S 1124), Université Paris Descartes - Paris 5 (UPD5)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM), Université Paris Descartes - Paris 5 (UPD5), Université de Toulouse (UT)-Université de Toulouse (UT)-Ecole Nationale Vétérinaire de Toulouse (ENVT), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Ecole d'Ingénieurs de Purpan (INP - PURPAN), Université de Toulouse (UT)-Université de Toulouse (UT), École normale supérieure de Lyon (ENS de Lyon)-Institut National de la Recherche Agronomique (INRA)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Université Bordeaux Segalen - Bordeaux 2-Institut National de la Recherche Agronomique (INRA)-Université Sciences et Technologies - Bordeaux 1 (UB), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National de la Recherche Agronomique (INRA)-Université Toulouse III - Paul Sabatier (UT3), MetaToul AXIOM (E20), Université de Toulouse (UT)-Université de Toulouse (UT)-MetaboHUB-MetaToul, MetaboHUB-Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université de Toulouse (UT)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-MetaboHUB-Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université de Toulouse (UT)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Université de Toulouse (UT)-Université de Toulouse (UT)-Plateforme Génome & Transcriptome (GET), Université de Toulouse (UT)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université de Rennes (UR)-Institut National de la Santé et de la Recherche Médicale (INSERM), Université de Rennes (UR), Institut National de la Recherche Agronomique (INRA)-École nationale vétérinaire, agroalimentaire et de l'alimentation Nantes-Atlantique (ONIRIS), Université Paris Descartes - Paris 5 (UPD5)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Université Fédérale Toulouse Midi-Pyrénées-Ecole Nationale Vétérinaire de Toulouse (ENVT), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Recherche Agronomique (INRA), École normale supérieure - Lyon (ENS Lyon)-Institut National de la Recherche Agronomique (INRA)-Université Claude Bernard Lyon 1 (UCBL), Unité de recherche Mycologie et Sécurité des Aliments (MSA), Profilomic, Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-IFR140-Institut National de la Santé et de la Recherche Médicale (INSERM), ToxAlim ( ToxAlim ), Institut National Polytechnique [Toulouse] ( INP ) -Institut National de la Recherche Agronomique ( INRA ) -Université Toulouse III - Paul Sabatier ( UPS ), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole Nationale Vétérinaire de Toulouse ( ENVT ), Institut National Polytechnique de Toulouse ( INPT ) -Institut National Polytechnique de Toulouse ( INPT ), Reproduction et développement des plantes ( RDP ), Centre National de la Recherche Scientifique ( CNRS ) -Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Institut National de la Recherche Agronomique ( INRA ) -École normale supérieure - Lyon ( ENS Lyon ), Unité de recherche Mycologie et Sécurité des Aliments ( MSA ), Institut National de la Recherche Agronomique ( INRA ), Biologie du fruit et pathologie ( BFP ), Université Bordeaux Segalen - Bordeaux 2-Institut National de la Recherche Agronomique ( INRA ) -Université Sciences et Technologies - Bordeaux 1, Institut National de la Santé et de la Recherche Médicale ( INSERM ), Groupe d'étude de la reproduction chez l'homme et les mammifères (GERHM), Université de Rennes 1 ( UR1 ), Université de Rennes ( UNIV-RENNES ), USC 1329 Laboratoire d'étude des Résidus et Contaminants dans les Aliments, Institut National de la Recherche Agronomique ( INRA ) -Alimentation Humaine ( ALIM.H ) -Laboratoire d'étude des Résidus et Contaminants dans les Aliments ( LABERCA ) -Ecole Nationale Vétérinaire, Agroalimentaire et de l'alimentation Nantes-Atlantique ( ONIRIS ), Pharmacologie, Toxicologie et Signalisation Cellulaire, Université Paris Descartes - Paris 5 ( UPD5 ), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Recherche Agronomique (INRA)-MetaToul-MetaboHUB, Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Recherche Agronomique (INRA)-Plateforme Génome & Transcriptome (GET), and Ecole Nationale Vétérinaire, Agroalimentaire et de l'alimentation Nantes-Atlantique (ONIRIS)-Institut National de la Recherche Agronomique (INRA)
Subjects: 2. Zero hunger, Kidney, [ SDV ] Life Sciences [q-bio], Gut barrier, Liver and kidney, [SDV]Life Sciences [q-bio], fungi, General Medicine, Urine, Biology, Toxicology, Micronutrient, Genetically modified organism, Animal science, medicine.anatomical_structure, Statistical analyses, medicine, Food science, ComputingMilieux_MISCELLANEOUS, Hormone
Abstract: International audience; Wistar rats were fed during 6 months with 33% maize, either non genetically modified or containing MON810 or NK603 (11% and 33%). Extensive chemical analysis by MS and NMR profiling and targeted analyses were undertaken to qualify the harvests and quantify in maize and pellets macro- and micronutrients, anti-nutrients and undesirable substances and contaminants. All diets contained low levels (50 to 100 fold lower than the MRL values) of undesirable substances. Thirty rats per gender were fed with 8 different diets: MON810 (11% and 33%) plus isogenic control, NK603 (11% and 33% ± glyphosate treatment) and isogenic control. Rats were sacrificed after 3 months (sub-group A, 10 rats per diet, per gender) and 6 months (sub-group B, 12 rats and C, 8 rats per diet, per gender). Urine were collected in metabolic cages and blood at 90 (sub-group A), 90/135/180 (sub-group B) and 180 days of feeding (sub-group C). In addition to classical toxicological analysis we performed metabolomics and hormones quantification in blood and urine, transcriptomics on liver and kidney, gut barrier analysis, kidney and gonads targeted immunohistology. Statistical analyses were conducted first blindly and thereafter on the basis of relevant pair-wise comparison. We easily discriminate the rat gender or maize origin. Among the numerous statistically significant differences in pair-wise comparisons some concerned GMO and non-GMO, but no biological relevance could be established due to the lack of differences in biologically linked variables, dose-response effects or clinical disorders.
Published: 2017

49. Insights into the role of hepatocyte PPARα activity in response to fasting

Author: Frédéric Lasserre, Arnaud Polizzi, Géraldine Michel, Justine Bertrand-Michel, Catherine Postic, Hervé Guillou, Fanny Viars, Walter Wahli, Alain Marrot, Sarra Smati, Edwin Fouché, Céline Lukowicz, Nicolas Loiseau, Claire Naylies, Marion Régnier, Yannick Lippi, Alexandra Montagner, Aurélie Batut, ToxAlim (ToxAlim), Institut National de la Recherche Agronomique (INRA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole Nationale Vétérinaire de Toulouse (ENVT), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Toxicologie Intégrative & Métabolisme (ToxAlim-TIM), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Recherche Agronomique (INRA)-Université Toulouse III - Paul Sabatier (UT3), Transcriptomic impact of Xenobiotics (E23 TRiX), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Plateforme Génome & Transcriptome (GET), Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Prévention et promotion de la cancérogénèse par les aliments (ToxAlim-PPCA), Institut des Maladies Métaboliques et Cardiovasculaires (I2MC), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Toulouse III - Paul Sabatier (UT3), Plateau MetaToul-LIPIDOMIQUE = MetaToul-Lipidomics, Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-MetaToul-MetaboHUB, Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Vétérinaire de Toulouse (ENVT), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Institut Cochin (UMR_S567 / UMR 8104), Université Paris Descartes - Paris 5 (UPD5)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Lee Kong Chian School of Medicine, Nanyang Technological University (NTU), Center for Integrative Genomics - Institute of Bioinformatics, Génopode (CIG), Swiss Institute of Bioinformatics [Lausanne] (SIB), Université de Lausanne (UNIL)-Université de Lausanne (UNIL), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Ecole Nationale Vétérinaire de Toulouse (ENVT), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Recherche Agronomique (INRA), Institute of Metabolic and Cardiovascular Diseases, Institut National de la Santé et de la Recherche Médicale (INSERM), Institute of Metabolic and Cardiovascular Disease, Metatoul-Lipidomic Facility, MetaboHUB, Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Descartes - Paris 5 (UPD5), Nanyang Technological University [Singapour], Center for Integrative Genomics, Université de Lausanne, Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-MetaToul-MetaboHUB, ToxAlim ( ToxAlim ), Institut National Polytechnique [Toulouse] ( INP ) -Institut National de la Recherche Agronomique ( INRA ) -Université Toulouse III - Paul Sabatier ( UPS ), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole Nationale Vétérinaire de Toulouse ( ENVT ), Institut National Polytechnique de Toulouse ( INPT ) -Institut National Polytechnique de Toulouse ( INPT ), Institut National de la Santé et de la Recherche Médicale ( INSERM ), Institut Cochin ( UMR_S567 / UMR 8104 ), Université Paris Descartes - Paris 5 ( UPD5 ) -Institut National de la Santé et de la Recherche Médicale ( INSERM ) -Centre National de la Recherche Scientifique ( CNRS ), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Ecole Nationale Vétérinaire de Toulouse (ENVT), and Lee Kong Chian School of Medicine (LKCMedicine)
Subjects: 0301 basic medicine, PPARalpha, [SDV]Life Sciences [q-bio], Peroxisome proliferator-activated receptor, Biochemistry, PPARα, Transcriptome, chemistry.chemical_compound, Endocrinology, FGF21, Transcriptional regulation, steatosis, Homeostasis, nuclear receptor, Regulation of gene expression, chemistry.chemical_classification, Fatty liver, NASH, Fasting, 3. Good health, medicine.anatomical_structure, Liver, Hepatocyte, medicine.medical_specialty, Biology, 03 medical and health sciences, Internal medicine, NAFLD, medicine, Animals, Medicine [Science], PPAR alpha, Molecular Biology, Fatty acid metabolism, [ SDV ] Life Sciences [q-bio], Gene Expression Profiling, Lipid metabolism, medicine.disease, Lipid Metabolism, Mice, Inbred C57BL, 030104 developmental biology, chemistry, Gene Expression Regulation, ketone bodies, lipolysis, Hepatocytes, Nuclear Receptor, Glycolipids
Abstract: The liver plays a central role in the regulation of fatty acid metabolism. Hepatocytes are highly sensitive to nutrients and hormones that drive extensive transcriptional responses. Nuclear hormone receptors are key transcription factors involved in this process. Among these factors, PPARα is a critical regulator of hepatic lipid catabolism during fasting. This study aimed to analyse the wide array of hepatic PPARα-dependent transcriptional responses during fasting. We compared gene expression in male mice with a hepatocyte specific deletion of PPARα and their wild-type littermates in the fed (ad libitum) and 24-h fasted states. Liver samples were acquired, and transcriptome and lipidome analyses were performed. Our data extended and confirmed the critical role of hepatocyte PPARα as a central for regulator of gene expression during starvation. Interestingly, we identified novel PPARα-sensitive genes, including Cxcl-10, Rab30, and Krt23. We also found that liver phospholipid remodelling was a novel fasting-sensitive pathway regulated by PPARα. These results may contribute to investigations on transcriptional control in hepatic physiology and underscore the clinical relevance of drugs that target PPARα in liver pathologies, such as non-alcoholic fatty liver disease.
Published: 2017

50. Comparing the intestinal transcriptome of Meishan and Large White piglets during late fetal development reveals genes involved in glucose and lipid metabolism and immunity as valuable clues of intestinal maturity

Author: H. Quesnel, Laure Gress, Marie-Christine Père, Véronique Romé, Laurianne Canario, Laurence Liaubet, Gaëlle Boudry, Yannick Lippi, Ying Yao, Isabelle Le Huërou-Luron, Magali SanCristobal, Yvon Billon, Samir Dou, Valentin Voillet, Pierre Mormède, Nathalie Iannucelli, Maëva Jégou, Nutrition, Métabolismes et Cancer (NuMeCan), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National de la Santé et de la Recherche Médicale (INSERM), Sichuan Agricultural University, Génétique Physiologie et Systèmes d'Elevage (GenPhySE ), Institut National de la Recherche Agronomique (INRA)-Ecole Nationale Vétérinaire de Toulouse (ENVT), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-École nationale supérieure agronomique de Toulouse [ENSAT], Physiologie, Environnement et Génétique pour l'Animal et les Systèmes d'Elevage [Rennes] (PEGASE), Institut National de la Recherche Agronomique (INRA)-AGROCAMPUS OUEST, ToxAlim (ToxAlim), Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole Nationale Vétérinaire de Toulouse (ENVT), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UPS), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Recherche Agronomique (INRA), This project received financial support from French National Agency of Research (PORCINET project, ANR-09-GENM005), Agrocampus Ouest (FRANCE), Ecole Nationale Vétérinaire de Toulouse - ENVT (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Institut National de la Recherche Agronomique - INRA (FRANCE), Institut National de la Santé et de la Recherche Médicale - INSERM (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Sichuan Agriculture University - SICAU (CHINA), Université de Rennes 1 (FRANCE), Génétique, Physiologie et Systèmes d’Elevage - GenPhySE (Toulouse, France), Institut National de la Recherche Agronomique (INRA)-Université de Rennes (UR)-Institut National de la Santé et de la Recherche Médicale (INSERM), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université de Toulouse (UT)-École nationale supérieure agronomique de Toulouse (ENSAT), Université de Toulouse (UT)-Université de Toulouse (UT), Transcriptomic impact of Xenobiotics (E23 TRiX), Institut National de la Recherche Agronomique (INRA)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Ecole Nationale Vétérinaire de Toulouse (ENVT), Université de Toulouse (UT)-Ecole d'Ingénieurs de Purpan (INP - PURPAN), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National de la Recherche Agronomique (INRA)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Plateforme Génome & Transcriptome (GET), Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université de Toulouse (UT)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Génétique, Expérimentation et Système Innovants (GenESI), Institut National de la Recherche Agronomique (INRA), PORCINET project, ANR-09-GENM005, The French National Research Agency, China Scholarship Council (CSC)-INRA joint PhD program, INRA GA and PHASE departments and the region Midi-Pyrénées, ANR-09-GENM-0005,PORCINET,Approche intégrée de la maturité des porcelets(2009), Institut National Polytechnique de Toulouse - INPT (FRANCE), Université Fédérale Toulouse Midi-Pyrénées-Ecole Nationale Vétérinaire de Toulouse (ENVT), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Recherche Agronomique (INRA), Génétique, Expérimentation et Système Innovants, Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES), École nationale supérieure agronomique de Toulouse [ENSAT]-Institut National de la Recherche Agronomique (INRA)-Ecole Nationale Vétérinaire de Toulouse (ENVT), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Recherche Agronomique (INRA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Recherche Agronomique (INRA)-Plateforme Génome & Transcriptome (GET), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Ecole Nationale Vétérinaire de Toulouse (ENVT), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut National de la Santé et de la Recherche Médicale (INSERM), AGROCAMPUS OUEST-Institut National de la Recherche Agronomique (INRA), Université Fédérale Toulouse Midi-Pyrénées-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Plateforme Génome & Transcriptome (GET), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), (OATAO), Open Archive Toulouse Archive Ouverte, and Génomique et biotechnologies végétales - Approche intégrée de la maturité des porcelets - - PORCINET2009 - ANR-09-GENM-0005 - GENOM-BTV - VALID
Subjects: 0301 basic medicine, pig, Microarray, Swine, Transcriptome, Fetal Development, 0302 clinical medicine, Intestinal Mucosa, 2. Zero hunger, Genetics, [SDV.BDD.EO] Life Sciences [q-bio]/Development Biology/Embryology and Organogenesis, Phenotype, Intestine, Intestines, [SDV.BBM.GTP] Life Sciences [q-bio]/Biochemistry, Molecular Biology/Genomics [q-bio.GN], PPARGC1A, microarray, Biotechnology, Research Article, Offspring, Biology, Carbohydrate metabolism, Andrology, Maturity, Lipid and glucose metabolism, Inflammation, Pig, 03 medical and health sciences, intestin, [SDV.BBM.GTP]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Genomics [q-bio.GN], [SDV.BA.ZV]Life Sciences [q-bio]/Animal biology/Vertebrate Zoology, Biologie animale, Animals, métabolisme du glucose, Fetus, métabolisme lipidique, Gene Expression Profiling, Immunity, Ripening, Lipid metabolism, maturité, Lipid Metabolism, 030104 developmental biology, Glucose, [SDV.BDD.EO]Life Sciences [q-bio]/Development Biology/Embryology and Organogenesis, [SDV.BA.ZV] Life Sciences [q-bio]/Animal biology/Vertebrate Zoology, 030217 neurology & neurosurgery, porc
Abstract: Background Maturity of intestinal functions is critical for neonatal health and survival, but comprehensive description of mechanisms underlying intestinal maturation that occur during late gestation still remain poorly characterized. The aim of this study was to investigate biological processes specifically involved in intestinal maturation by comparing fetal jejunal transcriptomes of two representative porcine breeds (Large White, LW; Meishan, MS) with contrasting neonatal vitality and maturity, at two key time points during late gestation (gestational days 90 and 110). MS and LW sows inseminated with mixed semen (from breed LW and MS) gave birth to both purebred and crossbred fetuses. We hypothesized that part of the differences in neonatal maturity between the two breeds results from distinct developmental profiles of the fetal intestine during late gestation. Reciprocal crossed fetuses were used to analyze the effect of parental genome. Transcriptomic data and 23 phenotypic variables known to be associated with maturity trait were integrated using multivariate analysis with expectation of identifying relevant genes-phenotypic variable relationships involved in intestinal maturation. Results A moderate maternal genotype effect, but no paternal genotype effect, was observed on offspring intestinal maturation. Four hundred and four differentially expressed probes, corresponding to 274 differentially expressed genes (DEGs), more specifically involved in the maturation process were further studied. In day 110-MS fetuses, Ingenuity® functional enrichment analysis revealed that 46% of DEGs were involved in glucose and lipid metabolism, cell proliferation, vasculogenesis and hormone synthesis compared to day 90-MS fetuses. Expression of genes involved in immune pathways including phagocytosis, inflammation and defense processes was changed in day 110-LW compared to day 90-LW fetuses (corresponding to 13% of DEGs). The transcriptional regulator PPARGC1A was predicted to be an important regulator of differentially expressed genes in MS. Fetal blood fructose level, intestinal lactase activity and villous height were the best predicted phenotypic variables with probes mostly involved in lipid metabolism, carbohydrate metabolism and cellular movement biological pathways. Conclusions Collectively, our findings indicate that the neonatal maturity of pig intestine may rely on functional development of glucose and lipid metabolisms, immune phagocyte differentiation and inflammatory pathways. This process may partially be governed by PPARGC1A. Electronic supplementary material The online version of this article (doi:10.1186/s12864-017-4001-2) contains supplementary material, which is available to authorized users.
Published: 2017

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86 results on '"Yannick Lippi"'

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