9 results on '"Sophie Pernot"'
Search Results
2. Un facteur de transcription se fait complice du VIH-1 pour détruire les défenses cellulaires
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Serena Bernacchi, Roland Marquet, Jean-Christophe Paillart, Julien Batisse, Santiago Guerrero, and Sophie Pernot
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General Medicine ,General Biochemistry, Genetics and Molecular Biology - Abstract
> Les elements genetiques mobiles representent une fraction considerable de notre genome et les mammiferes ont developpe plusieurs facteurs cellulaires restreignant l’expansion des transposons, retrotransposons et retrovirus. Plusieurs facteurs de restriction inhibant la replication des retrovirus, dont les virus de l’immunodeficience humaine de types 1 et 2 (VIH-1, VIH-2), ont ainsi ete identifies : TRIM5a (tripartite motif-containing protein 5a), la tetherine, SAMHD1 (SAM domain and HD domain 1), et plusieurs membres de la famille des cytidines desaminases APOBEC-3 (apolipoprotein B mRNAediting, enzyme-catalytic, polypeptide-like 3) [1-3]. Parmi ces derniers, A-3G et A-3F, qui sont exprimes dans les cellules cibles naturelles des VIH-1 et VIH-2, sont les plus importants [1, 3]. Les retrovirus ont cependant acquis la capacite de contourner ces facteurs de restriction. Certains ont developpe des proteines dites accessoires dans ce seul but : c’est le cas du facteur d’infectiosite viral (Vif) et de la proteine virale U (Vpu) des VIH-1 et VIH-2, ainsi que de la proteine virale X (Vpx) du VIH-2, qui contrecarrent respectivement A-3C/3DE/3F/3G/3H [1, 3], la tetherine [1] et SAMHD1 [2]. La neutralisation des facteurs de restriction par les retrovirus implique tres souvent le detournement de la voie de degradation des proteines cellulaires par le proteasome en reponse a leur polyubiquitination. Ubiquitinylation des facteurs de restriction par la proteine virale Vif L’ubiquitinylation des proteines eucaryotes fait tout d’abord intervenir une des deux enzymes activatrices, E1, qui transfere l’ubiquitine a l’une des enzymes de conjugaison, E2 ; enfin, une ubiquitine ligase (E3, il en existe plusieurs centaines), transfere l’ubiquitine aux substrats specifiques. Trois proteines accessoires du VIH-1, Vif, Vpu et Vpr sont connues pour detourner trois ubiquitine ligases E3 differentes appartenant a la famille des cullin-RING E3 ligases. La proteine Vif du VIH-1 possede en son centre un motif HCCH liant le zinc et une boite culline qui permettent le recrutement de la culline 5 (Cul-5), Cul-5 etant capable de lier Rbx-2, une proteine possedant un domaine RING. Vif possede en outre dans sa region carboxy-terminale un motif appele SOCS (suppressor of cytokine signaling) box qui recrute l’elongine C (Elo-C) qui forme un heterodimere avec l’elongine B (Elo-B) (Figure 1, voie B). Le complexe Cul-5/Rbx2/Elo-B/Elo-C ainsi recrute par la proteine Vif permet l’ubiquitinylation d’A-3G/A-3F, orientant ainsi ces proteines vers la degradation par le proteasome (Figure 1, voie B).
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- 2012
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3. Hepatitis C Virus-Induced Upregulation of MicroRNA miR-146a-5p in Hepatocytes Promotes Viral Infection and Deregulates Metabolic Pathways Associated with Liver Disease Pathogenesis
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Sarah C. Durand, Catherine Schuster, Tao Ye, Emilie Crouchet, Patrick Pessaux, Christine Thumann, Sophie Pernot, I. Fofana, Simonetta Bandiera, Markus H. Heim, Marine A. Oudot, Jochen Barths, Hussein El Saghire, Thomas F. Baumert, Mirjam B. Zeisel, Génétique et épigénétique des maladies métaboliques, neurosensorielles et du développement (Inserm U781), Université Paris Descartes - Paris 5 (UPD5)-Institut National de la Santé et de la Recherche Médicale (INSERM), Maladies Virales et Hépatiques, inserm U1110, Institut de Recherche sur les Maladies Virales et Hépatiques (IVH), Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM), Université Paris Nanterre - UFR Sciences sociales et administration (UPN SSA), Université Paris Nanterre (UPN), Interaction virus-hôte et maladies du foie, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Interactions Virus-Hôte et Maladies Hépatiques, Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Virologie, Institut de génétique et biologie moléculaire et cellulaire (IGBMC), Université Louis Pasteur - Strasbourg I-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), CHU Strasbourg, and University Hospital Basel [Basel]
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Adult ,Male ,Transcriptional Activation ,0301 basic medicine ,Carcinoma, Hepatocellular ,Hepatitis C virus ,Viral pathogenesis ,[SDV]Life Sciences [q-bio] ,Immunology ,Hepacivirus ,Biology ,Sciences du Vivant [q-bio]/Médecine humaine et pathologie ,Chronic liver disease ,medicine.disease_cause ,Microbiology ,Pathogenesis ,03 medical and health sciences ,Liver disease ,Virology ,medicine ,Humans ,ComputingMilieux_MISCELLANEOUS ,Aged ,Gene Expression Profiling ,Liver cell ,Liver Neoplasms ,High-Throughput Nucleotide Sequencing ,[SDV.MHEP.HEG]Life Sciences [q-bio]/Human health and pathology/Hépatology and Gastroenterology ,Hepatitis C ,Middle Aged ,medicine.disease ,digestive system diseases ,Virus-Cell Interactions ,Up-Regulation ,3. Good health ,MicroRNAs ,030104 developmental biology ,Insect Science ,Host-Pathogen Interactions ,Hepatocytes ,Female ,Liver cancer ,Biomarkers ,Metabolic Networks and Pathways ,[SDV.MHEP]Life Sciences [q-bio]/Human health and pathology - Abstract
Hepatitis C virus (HCV)-induced chronic liver disease is a leading cause of hepatocellular carcinoma (HCC). However, the molecular mechanisms underlying HCC development following chronic HCV infection remain poorly understood. MicroRNAs (miRNAs) play an important role in homeostasis within the liver, and deregulation of miRNAs has been associated with liver disease, including HCC. While host miRNAs are essential for HCV replication, viral infection in turn appears to induce alterations of intrahepatic miRNA networks. Although the cross talk between HCV and liver cell miRNAs most likely contributes to liver disease pathogenesis, the functional involvement of miRNAs in HCV-driven hepatocyte injury and HCC remains elusive. Here we combined a hepatocyte-like cell-based model system, high-throughput small RNA sequencing, computational analysis, and functional studies to investigate HCV-miRNA interactions that may contribute to liver disease and HCC. Profiling analyses indicated that HCV infection differentially regulated the expression of 72 miRNAs by at least 2-fold, including miRNAs that were previously described to target genes associated with inflammation, fibrosis, and cancer development. Further investigation demonstrated that the miR-146a-5p level was consistently increased in HCV-infected hepatocyte-like cells and primary human hepatocytes, as well as in liver tissue from HCV-infected patients. Genome-wide microarray and computational analyses indicated that miR-146a-5p overexpression modulates pathways that are related to liver disease and HCC development. Furthermore, we showed that miR-146a-5p has a positive impact on late steps of the viral replication cycle, thereby increasing HCV infection. Collectively, our data indicate that the HCV-induced increase in miR-146a-5p expression both promotes viral infection and is relevant for pathogenesis of liver disease. IMPORTANCE HCV is a leading cause of chronic liver disease and cancer. However, how HCV induces liver cancer remains poorly understood. There is accumulating evidence that a viral cure does not eliminate the risk for HCC development. Thus, there is an unmet medical need to develop novel approaches to predict and prevent virus-induced HCC. miRNA expression is known to be deregulated in liver disease and cancer. Furthermore, miRNAs are essential for HCV replication, and HCV infection alters miRNA expression. However, how miRNAs contribute to HCV-driven pathogenesis remains elusive. Here we show that HCV induces miRNAs that may contribute to liver injury and carcinogenesis. The miR-146a-5p level was consistently increased in different cell-based models of HCV infection and in HCV patient-derived liver tissue. Furthermore, miR-146a-5p increased HCV infection. Collectively, our data are relevant to understanding viral pathogenesis and may open perspectives for novel biomarkers and prevention of virus-induced liver disease and HCC.
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4. A Standard Set of Value-Based Patient-Centered Outcomes for Pancreatic Carcinoma: An International Delphi Survey.
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Cherkaoui, Zineb, González, Cristians, Wakabayashi, Taiga, Delattre, Bastien, Léost, Elodie, Serra, Sébastien, Huppertz, Jerôme, Klein, Francine, Stéphan, Marie, Meyer, Jean-Michel, Schaff, Alain, Martinis, Elisa, Bangoura, Elena, Kieffer, Sophie, Blanès, Sophie, Haddad, Elham, De Guio, Gabrielle, Felli, Emanuele, Pernot, Sophie, and Marescaux, Jacques
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Background: Global health systems are shifting toward value-based health care to improve patient outcomes in the face of rising health care costs. The challenge is to identify standardized outcome measurements that allow optimal quality-of-care monitoring and comparison to optimize medical practices and patient pathways. A common outcomes definition is required, including medical results (Clinical Reported Outcomes Measurements [CROMs]) and quality-of-life components that matter most to patients (Patient-Reported Outcomes Measurements [PROMs]), which are particularly important for severe pathologies with short life expectancy such as pancreatic cancer. This study aimed to create standardized metrics that could be used for outcomes analysis of pancreatic cancer care. Methods: A multidisciplinary working group (WG) was assembled. A systematic review was performed to collect the most used outcomes in clinical studies of pancreatic cancers. The study reviewed 570 studies published in the last 10 years. From these studies, 3370 outcomes, including CROMs, and PROMs, were listed and prioritized. The WG reached a consensus on key outcomes, proposed groupings for CROMs and PROMs, identified existing questionnaires that could be used for PROMs collection, and set the timeline for data collection. To refine and validate the final outcomes set, an international external committee completed a Delphi process (two rounds for both CROMS and PROMs). Results: After the systematic literature review, the WG selected 102 outcomes (92 CROMs and 10 PROMs) for submission to the international Delphi vote committee. The committee retrained 89 outcomes (78 CROMs and 11 PROMs). For the PROMs, the WG and the international external committee chose a validated questionnaire, the Functional Assessment of Cancer Therapy-Hepatobiliary, which covers all of the 11 selected PROMs. Conclusions: A standardized set of outcome measures that need to be validated through international health outcome comparisons and quality-of-care assessments was built. Pilot projects are underway to test and optimize the approach in real-life conditions. [ABSTRACT FROM AUTHOR]
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- 2021
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5. Functional microRNA screen uncovers O-linked N-acetylglucosamine transferase as a host factor modulating hepatitis C virus morphogenesis and infectivity.
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Herzog, Katharina, Bandiera, Simonetta, Pernot, Sophie, Fauvelle, Catherine, Jühling, Frank, Weiss, Amélie, Bull, Anne, Durand, Sarah C., Chane-Woon-Ming, Béatrice, Pfeffer, Sébastien, Mercey, Marion, Lerat, Hervé, Meunier, Jean-Christophe, Raffelsberger, Wolfgang, Brino, Laurent, Baumert, Thomas F., and Zeisel, Mirjam B.
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HEPATITIS C virus ,TRANSFERASES ,SMALL interfering RNA ,MICRORNA ,MORPHOGENESIS - Published
- 2020
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6. Peripheral tumour targeting using open-source virtual bronchoscopy with electromagnetic tracking: a multi-user pre-clinical study.
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Jaeger, Herman Alexander, Trauzettel, Fabian, Nardelli, Pietro, Daverieux, Federico, Hofstad, Erlend Fagertun, Leira, Håkon O., Kennedy, Marcus P., Langø, Thomas, and Cantillon-Murphy, Pádraig
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ELECTROMAGNETISM ,PNEUMOTHORAX ,LUNG tumors ,ANIMAL experimentation ,CATHETERS ,TECHNOLOGY ,BRONCHOSCOPY - Abstract
Objectives: The goal was to demonstrate the utility of open-source tracking and visualisation tools in the targeting of lung cancer. Material and methods: The study demonstrates the first deployment of the Anser electromagnetic (EM) tracking system with the CustusX image-guided interventional research platform to navigate using an endobronchial catheter to injected tumour targets. Live animal investigations validated the deployment and targeting of peripheral tumour models using an innovative tumour marking routine. Results: Novel tumour model deployment was successfully achieved at all eight target sites across two live animal investigations without pneumothorax. Virtual bronchoscopy with tracking successfully guided the tracked catheter to 2–12 mm from the target tumour site. Deployment of a novel marker was achieved at all eight sites providing a reliable measure of targeting accuracy. Targeting accuracy within 10 mm was achieved in 7/8 sites and in all cases, the virtual target distance at marker deployment was within the range subsequently measured with x-ray. Conclusions: Endobronchial targeting of peripheral airway targets is feasible using existing open-source technology. Notwithstanding the shortcomings of current commercial platforms, technological improvements in EM tracking and registration accuracy fostered by open-source technology may provide the impetus for widespread clinical uptake of electromagnetic navigation in bronchoscopy. [ABSTRACT FROM AUTHOR]
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- 2019
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7. Hybrid endoluminal stapled pyloroplasty: an alternative treatment option for gastric outlet obstruction syndrome.
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Gonzalez, Cristians, Kwak, Jung-Myun, Davrieux, Federico, Watanabe, Ryohei, Marescaux, Jacques, and Swanstrom, Lee
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LAPAROSCOPIC surgery ,GASTRIC outlet obstruction ,STAPLERS (Surgery) ,GASTROPARESIS ,PYLORUS ,LAPAROSCOPY - Abstract
Background: Gastroparesis is a rapidly increasing problem with sometimes devastating consequences. While surgical treatments, particularly laparoscopic pyloroplasty, have recently gained popularity, they require general anesthesia, advanced skills, and can lead to leaks. Peroral pyloromyotomy is a less invasive alternative; however, this technique is technically demanding and not widely available. We describe a hybrid laparo-endoscopic collaborative approach using a novel gastric access device to allow endoluminal stapled pyloroplasty as an alternative treatment option for gastric outlet obstruction.Methods: Under general anesthesia, six pigs (mean weight 33 kg) underwent endoscopic placement of intragastric ports using a technique similar to percutaneous endoscopic gastrostomy. A 5 mm laparoscope was used for visualization. A functional lumen imagine probe was used to measure the cross-sectional area (CSA) and diameter of the pylorus before, after, and at 1 week after intervention. Pyloroplasty was performed using a 5 mm articulating laparoscopic stapler. Gastrotomies were closed by endoscopic clips, endoscopic suture, or combination. After 6-8 days, a second evaluation was performed. At the end of the protocol, all animals were euthanized.Results: Six pyloroplasties were performed. In all cases, this technique was effective in achieving significant pyloric dilatation. The median pre-pyloroplasty pyloric diameter (D) and cross-sectional area (CSA) were 8 mm (4.9-11.6 mm) and 58.6 mm2 (19-107 mm2), respectively. After the procedure, these values increased to 13.41 mm (9.8-17.6 mm) and 147.7 mm2 (76-244 mm2), respectively (p = 0.0152). No important intraoperative events were observed. Postoperatively, all animals did well, with adequate oral intake and no relevant complications. At follow-up endoscopy, all incisions were healed and the pylorus widely patent.Conclusions: Hybrid endoluminal stapled pyloroplasty is a feasible, safe, and effective alternative method for the treatment of gastric outlet obstruction syndrome. [ABSTRACT FROM AUTHOR]- Published
- 2019
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8. Improved co-registration of ex-vivo and in-vivo cardiovascular magnetic resonance images using heart-specific flexible 3D printed acrylic scaffold combined with non-rigid registration
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Whitaker, John, Neji, Radhouene, Byrne, Nicholas, Puyol-Antón, Esther, Mukherjee, Rahul K., Williams, Steven E., Chubb, Henry, O’Neill, Louisa, Razeghi, Orod, Connolly, Adam, Rhode, Kawal, Niederer, Steven, King, Andrew, Tschabrunn, Cory, Anter, Elad, Nezafat, Reza, Bishop, Martin J., O’Neill, Mark, Razavi, Reza, and Roujol, Sébastien
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- 2019
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9. Hybrid transgastric approach for the treatment of gastroesophageal junction pathologies.
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Gonzalez, C, Kwak, J-M, Davrieux, F, Watanabe, R, Marescaux, J, and Swanström, L L
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ESOPHAGOGASTRIC junction ,FUNDOPLICATION ,PERCUTANEOUS endoscopic gastrostomy ,GENERAL anesthesia ,ENDOSCOPY ,LAPAROSCOPY ,SUTURING - Abstract
Flexible endoscopy has evolved to the point that it includes many endoluminal procedures that once required open or laparoscopic surgery, for instance, antireflux surgery, pyloromyotomy, mucosal and submucosal tumor resections, and even full-thickness resection. However, these procedures remain technically demanding due to flexible technology issues: difficult imaging, limited energy devices, lack of staplers, unsatisfactory suturing abilities, and so on. Transgastric laparoscopy or hybrid laparoscopy/flex endoscopy has been described for almost two decades as an alternative to a pure endoluminal approach, mainly for pancreatic pseudocyst drainage and full-thickness and mucosal resection of various lesions. The approach has never been widely adopted mostly due to cumbersome and difficult to maintain methods of gastric access. We propose to expand the indications of transgastric laparoscopy by using novel endoscopically placed ports to replicate endoscopic procedures particularly in the difficult to access proximal stomach such as endoluminal antireflux surgery. Under general anesthesia, five female pigs (mean weight: 27.6 kg) had endoscopic placement of 3, 5 mm intragastric ports (Endo-TAGSS, Leakwood KS, USA) using a technique similar to percutaneous endoscopic gastrostomy. A 5-mm laparoscope was used for visualization. Laparoendoscopic-assisted plication of the gastroesophageal junction (GEJ) was performed using 3–0 interrupted sutures (Polysorb
® , Covidien, Mansfield, MA, USA). A functional lumen imagine probe (EndoFLIP® , Crospon, Inc. Galway, Ireland) was used to measure diameter, cross sectional area (CSA), distensibility, and compliance of GEJ before and after intervention. Once the TAGSS ports were removed, the gastrotomies were closed by using endoscopic over-the-scope clips. At the end of the procedure, animals were euthanized. Five laparoendoscopic-assisted endoluminal plications were performed. The mean operative time was 65.6 min (Endoscopic evaluation: 3.2 min, TAGSS Insertion: 11 min, EndoFLIP evaluation + GEJ Plication: 43.25 min, gastric wall closure: 15 minutes). In all cases, this technique was effective and allowed to achieve an adequate GEJ plication by endoscopic grading and EndoFLIP measurements. Median pre-plication GEJ diameter (D) and median pre-plication GEJ cross-sectional area (CSA) were 11.42 mm (8.6–13.6 mm) and 104.8 mm2 (58–146 mm2 ). After the procedure, these values were decreased to 6.14 mm (5.7–6.6 mm) and 29.8 mm2 (25–34 mm2 ) respectively (p = 0.0079). Median pre-plication distensibility (d) and compliance (C) were 7.87 mm2 /mmHg (2.4–22.69 mm2 /mmHg) and 190.56 mm3 /mmHg (70.9–502.8 mm3 /mmHg). After the procedure, these values decreased to 1.5 mm2 /mmHg (0.7–2.2 mm2 /mmHg) and 52.17 mm3 /mmHg (21.9–98.7 mm3 /mmHg) respectively (p = 0.0317). No intraoperative events were observed. Endoscopically, all valves were felt to be transitioned from a Hill grade 3 (normal state for the animal model) to a Hill grade 1 at the procedure completion. A hybrid laparoendoscopic approach is a feasible alternative for performing intragastric procedures with the assistance of conventional laparoscopic instruments; especially in cases where the intervention location limits the access to standard endoscopy or where endoscopic technology is inadequate. Further evaluation is planned in survival models and clinical trials. [ABSTRACT FROM AUTHOR]- Published
- 2019
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