16 results on '"Wallner, Marlies"'
Search Results
2. Distinct maternal amino acids and oxylipins predict infant fat mass and fat-free mass indices.
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Riederer, Monika, Wallner, Marlies, Schweighofer, Natascha, Fuchs-Neuhold, Bianca, Rath, Anna, Berghold, Andrea, Eberhard, Katharina, Groselj-Strele, Andrea, Staubmann, Wolfgang, Peterseil, Marie, Waldner, Irmgard, Mayr, Johannes A., Rothe, Michael, Holasek, Sandra, Maunz, Susanne, Pail, Elisabeth, and van der Kleyn, Moenie
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ADIPOSE tissues , *OXYLIPINS , *INFANTS , *INFANT development , *BREAST milk - Abstract
Interested in maternal determinants of infant fat mass index (FMI) and fat-free mass index (FFMI), considered as predictors for later development of obesity, we analysed amino acids (AA) and oxylipins in maternal serum and breast milk (BM). FMI and FFMI were calculated in 47 term infants aged 4 months (T4). Serum AA were analysed in pregnancy (T1, T2) and 6–8 weeks postpartum (T3). At T3, AA and oxylipins were analysed in BM. Biomarker-index-associations were identified by regression analysis. Infant FMI (4.1 ± 1.31 kg/m2; MW ± SD) was predicted by T2 proline (R2 adj.: 7.6%, p =.036) and T3 BM 11-hydroxy-eicosatetraenoic-acid (11-HETE) and 13-hydroxy-docosahexaenoic-acid (13-HDHA; together:35.5% R2 adj., p <.001). Maternal peripartum antibiotics (AB) emerged as confounders (+AB: 23.5% higher FMI; p =.025). Infant FFMI (12.1 ± 1.19 kg/m2; MW ± SD) was predicted by histidine (R2 adj.: 14.5%, p <.001) and 17-HDHA (BM, R2 adj.:19.3%, p <.001), determined at T3. Confirmed in a larger cohort, the parameters could elucidate connections between maternal metabolic status, nutrition, and infant body development. [ABSTRACT FROM AUTHOR]
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- 2023
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3. Effect of feeding Alphitobius diaperinus meal on fattening performance and meat quality of growing-finishing pigs.
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Richli, Martina Müller, Weinlaender, Fabian, Wallner, Marlies, Pöllinger-Zierler, Barbara, Kern, Julian, and Scheeder, Martin R. L.
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MEAT quality , *CATTLE crossbreeding , *UNSATURATED fatty acids , *SWINE , *SOYBEAN meal , *ADIPOSE tissues - Abstract
A total of 48 piglets with an average weight of 26 kg were allocated to 4 experimental groups of 12 animals, balanced according to litter, sex and weight, and fattened on feed containing 0, 3, 6, or 9% of Alphitobius diaperinus meal (ADM) replacing soybean meal (SOY) as protein source. The control feed contained 10.7% SOY while in the 9% ADM feed SOY was completely replaced. Feed was accessible ad libitum in transponder-controlled feeders. Feed consumption and fattening performance records started when the animals reached 35 kg. The 3-way crossbred animals (Landrace x Large White sows mated to Duroc, Pietrain, or Large White sire line bores) were slaughtered at a target carcass weight of 86 kg. No linear effect of ADM on daily gain and feed consumption was found. No effect on lean meat content nor on any of the meat quality traits was observed. The content of polyunsaturated fatty acids (PUFA) in the backfat increased with increasing amount of ADM in the feed. It is concluded that ADM may replace SOY in pig feed without exerting detrimental effects on growth performance, carcass composition and meat quality except for a higher PUFA-content in the adipose tissue. [ABSTRACT FROM AUTHOR]
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- 2023
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4. Looking to the horizon: the role of bilirubin in the development and prevention of age-related chronic diseases.
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Wagner, Karl-Heinz, Wallner, Marlies, Mölzer, Christine, Gazzin, Silvia, Bulmer, Andrew Cameron, Tiribelli, Claudio, and Vitek, Libor
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PREVENTION of chronic diseases , *BILIRUBIN , *AGE factors in disease , *BIOMARKERS , *CARDIOVASCULAR diseases risk factors ,CARDIOVASCULAR disease related mortality - Abstract
Bilirubin, the principal tetrapyrrole, bile pigment and catabolite of haem, is an emerging biomarker of disease resistance, which may be related to several recently documented biological functions. Initially believed to be toxic in infants, the perception of bilirubin has undergone a transformation: it is now considered to be a molecule that may promote health in adults. Data from the last decade demonstrate that mildly elevated serum bilirubin levels are strongly associated with reduced prevalence of chronic diseases, particularly cardiovascular diseases (CVDs), as well as CVD-related mortality and risk factors. Recent data also link bilirubin to other chronic diseases, including cancer and Type 2 diabetes mellitus, and to all-cause mortality. Therefore, there is evidence to suggest that bilirubin is a biomarker for reduced chronic disease prevalence and a predictor of all-cause mortality, which is of important clinical significance. In the present review, detailed information on the association between bilirubin and all-cause mortality, as well as the pathological conditions of CVD, cancer, diabetes and neurodegenerative diseases, is provided. The mechanistic background concerning how bilirubin and its metabolism may influence disease prevention and its clinical relevance is also discussed. Given that the search for novel biomarkers of these diseases, as well as for novel therapeutic modalities, is a key research objective for the near future, bilirubin represents a promising candidate, meeting the criteria of a biomarker, and should be considered more carefully in clinical practice as a molecule that might provide insights into disease resistance. Clearly, however, greater molecular insight is warranted to support and strengthen the conclusion that bilirubin can prevent disease, with future research directions also proposed. [ABSTRACT FROM AUTHOR]
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- 2015
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5. Haem catabolism: a novel modulator of inflammation in Gilbert's syndrome.
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Wallner, Marlies, Bulmer, Andrew C., Mölzer, Christine, Müllner, Elisabeth, Marculescu, Rodrig, Doberer, Daniel, Wolzt, Michael, Wagner, Oswald F., and Wagner, Karl‐Heinz
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HEME oxygenase , *METABOLISM , *INFLAMMATION , *BILIRUBIN , *HEMOGLOBINS , *C-reactive protein - Abstract
Background Moderately elevated unconjugated bilirubin concentrations protect against inflammatory diseases and are present in individuals with Gilbert's syndrome. This study examined the relationship between circulating haem oxygenase catabolites, unconjugated bilirubin, carboxy haemoglobin, iron and inflammatory parameters. Materials and methods Seventy-six matched individuals were allocated to Gilbert's syndrome ( GS) or control group (unconjugated bilirubin ≥ or < 17·1 μM). Iron, carboxy haemoglobin and high-sensitivity C-reactive protein were analysed using routine diagnostic tests. Unconjugated bilirubin and haem were analysed using high-performance liquid chromatography. The cytokines IL-1β, TNF-α and IL-6 were assessed using high-sensitivity enzyme-linked immunosorbent assays. Results Gilbert's syndrome subjects had significantly greater levels of unconjugated bilirubin ( P < 0·05), carboxy haemoglobin ( P < 0·05), iron ( P < 0·05), IL-1β ( P < 0·05), a significantly lower body mass index ( P < 0·05) and IL-6 concentrations ( P < 0·05) vs. controls. Regression analysis revealed that unconjugated bilirubin mainly explained IL-1β results (16%), and body mass index+ IL-6 predicted 26% of the variance in C-reactive protein concentrations. Conclusions A positive relationship between unconjugated bilirubin and free plasma haem, iron and carboxy haemoglobin indicated a positive feedback loop of haem oxygenase induction possibly mediated by unconjugated bilirubin. Furthermore, reduced body mass index in Gilbert's syndrome individuals was linked to reduced inflammation status, which could be influenced by circulating haem oxygenase catabolites and contribute to reduced risk of noncommunicable diseases in this population. [ABSTRACT FROM AUTHOR]
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- 2013
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6. Protection from age-related increase in lipid biomarkers and inflammation contributes to cardiovascular protection in Gilbert's syndrome.
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WALLNER, Marlies, MARCULESCU, Rodrig, DOBERER, Daniel, WOLZT, Michael, WAGNER, Oswald, VITEK, Libor, BULMER, Andrew C., and WAGNER, Karl-Heinz
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CARDIOVASCULAR diseases , *LIPID metabolism , *BILIRUBIN , *CHOLESTEROL , *BLOOD plasma - Abstract
Recent epidemiological and clinical data show protection from CVD (cardiovascular disease), all-cause mortality and cancer in subjects with GS (Gilbert's syndrome), which is characterized by a mildly elevated blood bilirubin concentration. The established antioxidant effect of bilirubin, however, contributes only in part to this protection. Therefore we investigated whether mildly elevated circulating UCB (unconjugated bilirubin) is associated with altered lipid metabolism. The study was performed on GS and age- and gender-matched healthy subjects (n=59 per group). Full lipoprotein profile, TAG (triacylglycerols), Apo (apolipoprotein)-A1, Apo-B, lipoprotein(a), the subfractions of LDL (low-density lipoprotein) and selected pro-inflammatory mediators were analysed. A hyperbilirubinaemic rodent model (Gunn rats, n=40) was investigated to further support the presented human data. GS subjects had significantly (P<0.05) improved lipid profile with reduced total cholesterol, LDL-C (LDL-cholesterol), TAG, low- and pro-atherogenic LDL subfractions (LDL-1+LDL-2), Apo-B, Apo-B/Apo-A1 ratio and lower IL-6 (interleukin 6) and SAA (serum amyloid A) concentrations (P= 0.094). When the control and GS groups were subdivided into younger and older cohorts, older GS subjects demonstrated reduced lipid variables (total cholesterol and LDL-C, TAG and LDL-C subfractions, Apo-B/Apo-A1 ratio; P<0.05; Apo-B: P<0.1) compared with controls. These data were supported by lipid analyses in the rodent model showing that Gunn rat serum had lower total cholesterol (2.29 ± 0.38 compared with 1.27 ± 0.72 mM; P<0.001) and TAG (1.66 ± 0.67 compared with 0.99 ± 0.52 mM; P<0.001) concentrations compared with controls. These findings indicate that the altered lipid profile and the reduced pro-inflammatory status in hyperbilirubinaemic subjects, particularly in the older individuals, probably contribute additionally to the commonly accepted beneficial antioxidant effects of bilirubin in humans. [ABSTRACT FROM AUTHOR]
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- 2013
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7. Features of an altered AMPK metabolic pathway in Gilbert's Syndrome, and its role in metabolic health.
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Mölzer, Christine, Wallner, Marlies, Kern, Carina, Tosevska, Anela, Schwarz, Ursula, Zadnikar, Rene, Doberer, Daniel, Marculescu, Rodrig, and Wagner, Karl-Heinz
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- 2016
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8. Mild hyperbilirubinaemia as an endogenous mitigator of overweight and obesity: Implications for improved metabolic health.
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Seyed Khoei, Nazlisadat, Grindel, Annemarie, Wallner, Marlies, Mölzer, Christine, Doberer, Daniel, Marculescu, Rodrig, Bulmer, Andrew, and Wagner, Karl-Heinz
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OBESITY , *METABOLISM , *BILIRUBIN , *GILBERT disease , *CARDIOVASCULAR diseases , *LIPID analysis , *BODY mass index , *PHYSIOLOGY - Abstract
Background and aims Mild endogenous elevation of unconjugated bilirubin (UCB) as seen in Gilbert's syndrome (GS), might mitigate cardiovascular disease (CVD) risk factors including overweight/obesity. This study aimed to determine whether hyperbilirubinaemia is linked to improved anthropometric data and lipid profile. Methods Our study considered GS and age-/gender-matched healthy controls (n = 248). Additionally, obese female type 2 diabetic patients (DM2) (n = 26) were included as a “disease control group”. Results BMI, hip circumference (HC), and lipid profile were significantly lower in GS. UCB was inversely correlated with BMI ( p <0 .001), HC as well as with fat mass (FM) and lipid variables ( p < 0.05). Moreover, DM2 patients had significantly lower UCB compared to GS and healthy controls. Older GS subjects (≥35 years) had significantly reduced anthropometric data and improved lipid profile. Conclusions Our results propose that the health promoting potential of mild hyperbilirubinaemia may extend to protection from age-related weight gain and dyslipidaemia. [ABSTRACT FROM AUTHOR]
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- 2018
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9. Free threonine in human breast milk is related to infant intestinal microbiota composition.
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Riederer, Monika, Schweighofer, Natascha, Trajanoski, Slave, Stelzer, Claudia, Zehentner, Miriam, Fuchs-Neuhold, Bianca, Kashofer, Karl, Mayr, Johannes A., Hörmann-Wallner, Marlies, Holasek, Sandra, and van der Kleyn, Moenie
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GUT microbiome , *BREAST milk , *INFANTS , *THREONINE , *INTERPERSONAL relations , *INFANT formulas , *LACTATION - Abstract
Background: Accumulating evidence indicates that free amino acids (FAA) might be bioactive compounds with potential immunomodulatory capabilities. However, the FAA composition in human milk is still poorly characterized with respect to its correlation to maternal serum levels and its physiological significance for the infant. Studies addressing the relation of human milk FAA to the infants' intestinal microbiota are still missing. Methods: As part of a pilot study, maternal serum and breast milk FAA concentrations as well as infant intestinal microbiota (16S rRNA) were determined 2 months after birth. The study cohort consisted of 41 healthy mothers and their term delivered, healthy infants with normal birthweight. The relationship between maternal serum and milk FAA was determined by correlation analyses. Associations between (highly correlated) milk FAA and infant intestinal beta diversity were tested using PERMANOVA, LefSe and multivariate regression models adjusted for common confounders. Results: Seven breast milk FAA correlated significantly with serum concentrations. One of these, threonine showed a negative association with abundance of members of the class Gammaproteobacteria (R2adj = 17.1%, p = 0.006; β= − 0.441). In addition, on the level of families and genera, threonine explained 23.2% of variation of the relative abundance of Enterobacteriaceae (R2adj; p = 0.001; β = − 0.504) and 11.1% of variability in the abundance of Escherichia/Shigella (R2adj, p = 0.025; β = − 0.368), when adjusted for confounders. Conclusion: Our study is the first to suggest potential interactions between breast milk FAA and infant gut microbiota composition during early lactation. The results might be indicative of a potential protective role of threonine against members of the Enterobacteriaceae family in breast-fed infants. Still, results are based on correlation analyses and larger cohorts are needed to support the findings and elucidate possible underlying mechanisms to assess the complex interplay between breast milk FAA and infant intestinal microbiota in detail. [ABSTRACT FROM AUTHOR]
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- 2022
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10. Development of a nutritional sensory toolkit for kindergarten teachers.
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Konrad, Manuela, Fuchs-Neuhold, Bianca, Staubmann, Wolfgang, Grach, Daniela, Hörmann-Wallner, Marlies, Kronberger, Anika, Peterseil, Marie, Pilz, René, Aufschnaiter, Anna Lena, Krause, Raphaela, Martin, Jochen, Holasek, Sandra, and Pail, Elisabeth
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FOOD preferences in children , *FOOD consumption , *CHILD nutrition , *CHILDREN'S health , *NUTRITION - Abstract
Children's food preferences are strongly associated with their consumption patterns. Children tend to choose foods with which they are familiar. It is proposed that the earlier and broader the experience with food, the healthier the child's or adult´s diet. In a focus group we developed a toolkit consisting of a training course for kindergarten staff, a booklet with nutrition and sensory-based information, and 55 professionally designed experiment cards. The cards came with exercises focusing on sensory tasting core food groups, including all food groups. Twenty-five kindergarten teachers completed the training, field-testing of the experiments and an online survey evaluating the cards. The evaluation was performed using frequency distributions with IBM® SPSS® 21 for Mac. Teachers reported high interest on the part of the children, good preparation for the experiments' practical implementation in kindergarten and favoured the appealing design and usability. The combination of the expert-driven development and personal training with sensory experiments is a broader approach for nutrition training and, as such, an enrichment for kindergarten teachers. [ABSTRACT FROM AUTHOR]
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- 2021
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11. A cross-cultural study on odor-elicited life stage-associations.
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Wendelin, Martin, Bauer, Andrea, Buchinger, Elisabeth, Danner, Lukas, Derndorfer, Eva, Thi Minh Hang, Vu, Hopfer, Helene, Wallner, Marlies, Jantathai, Srinual, Julius, Nina, Matullat, Imke, Majchrzak, Dorota, Siegmund, Barbara, Seo, Han-Seok, Spangl, Bernhard, and Duerrschmid, Klaus
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CROSS-cultural studies , *VIETNAMESE people , *EPISODIC memory , *HAY , *ORANGES , *VANILLA , *COCONUT - Abstract
[Display omitted] • Non-trained individuals from seven countries associated nine selected odors with four stages of life. • Similarities but also differences in odor-elicited life stage-associations were found over the countries. • Both age and gender affected odor-elicited life stage-associations. Associative conceptualization plays an important role in how we perceive and interact with our environment. Particularly odor associations can be highly vivid and often long-lasting due to their close connection with our episodic memory and emotions. Based on the findings of a study conducted in Austria in 2017, this work was carried out to investigate odor-elicited life stage-associations (OELSA) in seven nations and to identify potential similarities and differences in conceptualizing odor impressions across these nations. A total of 1144 adults (aged 21–60) from Austria, Australia, Germany, Switzerland, Thailand, USA, and Vietnam participated in this study. Nine odors (vanilla , orange , lemon , mint , coconut , basil , rose , anise , and hay) were presented to the participants, and they were asked to answer questions about their spontaneous associations with life stages. The results indicate the existence of OELSA in all investigated nations. For example, vanilla was predominantly assigned to children in all nations, while hay was primarily assigned to elder people. While most of the investigated odors were most frequently associated with adults, some significant differences in OELSA were observed between the different nationalities. For instance, mint was more frequently associated with children by Australian participants compared to participants from all other nations, while coconut was more strongly associated with children by the Vietnamese participants compared to all other participants. The results of this study demonstrate the existence of consistent life stage-related associations elicited by certain odors across different nations and cultures and, at the same time points to differences in life stage-related association with certain odors between the nations. Since this work was not designed to identify the reasons for these differences, we can only make assumptions about the potential underlying causes for these behaviors. [ABSTRACT FROM AUTHOR]
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- 2023
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12. Longer telomeres in chronic, moderate, unconjugated hyperbilirubinaemia: insights from a human study on Gilbert's Syndrome.
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Tosevska, Anela, Moelzer, Christine, Wallner, Marlies, Janosec, Milan, Schwarz, Ursula, Kern, Carina, Marculescu, Rodrig, Doberer, Daniel, Weckwerth, Wolfram, and Wagner, Karl-Heinz
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- 2016
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13. Nuclear anomalies in exfoliated buccal cells in healthy and diabetic individuals and the impact of a dietary intervention.
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Müllner, Elisabeth, Brath, Helmut, Nersesyan, Armen, Nitz, Marlies, Petschnig, Alice, Wallner, Marlies, Knasmüller, Siegfried, and Wagner, Karl-Heinz
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TREATMENT of diabetes , *DIET therapy , *BIOMARKERS , *UNSATURATED fatty acids , *NUCLEOLUS , *GLYCOSYLATED hemoglobin , *RANDOMIZED controlled trials - Abstract
This study aimed to compare the frequencies of nuclear anomalies in buccal cells between diabetic and non-diabetic individuals and to assess the impact of a ‘healthy diet’—a cornerstone in the treatment of diabetes. Seventy-six diabetic and 21 non-diabetic individuals participated in this parallel, randomised, intervention trial. All participants received information about the importance of a healthy diet, while participants randomly assigned to the intervention group received additionally 300g of vegetables and 25ml of plant oil rich in polyunsaturated fatty acids (PUFA) per day for 8 weeks. Cytogenetic damage in buccal cells was assessed at baseline and after 8 weeks using the buccal micronucleus cytome assay. Micronucleus (MN) frequency at baseline was significantly higher in participants with diabetes (0.58±0.30‰) compared with non-diabetic individuals (0.28±0.29‰). Further analysis of baseline data revealed significantly higher MN levels in participants of the highest tertile of waist circumference (+40%), fasting plasma glucose (+55%), glycated haemoglobin (+41%) and cardiovascular disease risk (+39%) relative to participants of the lowest tertile. The dietary intervention had no effect on MN frequencies. Glycated haemoglobin and biomarkers reflecting cytokinetic defect or acute cell death were reduced in both the intervention and ‘information only’ groups. The results of this study suggest a strong impact of abdominal obesity and glucose metabolism on genomic stability. Similar effects on nuclear anomalies were observed in the ‘information only’ group and the intervention group receiving vegetables and PUFA-rich plant oil. [ABSTRACT FROM AUTHOR]
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- 2014
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14. Genome damage in peripheral blood lymphocytes of diabetic and non-diabetic individuals after intervention with vegetables and plant oil.
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Müllner, Elisabeth, Brath, Helmut, Toferer, Daniela, Adrigan, Sonja, Bulla, Marie-Therese, Stieglmayer, Roswitha, Wallner, Marlies, Marek, Reinhard, and Wagner, Karl-Heinz
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DNA damage , *LYMPHOCYTES , *BLOOD cells , *VEGETABLE oils , *PEOPLE with diabetes , *CANCER risk factors , *UNSATURATED fatty acids - Abstract
Recent studies suggest increased cancer risk in patients with type 2 diabetes mellitus (T2DM) compared with healthy individuals. The present study aims to assess whether T2DM is associated with increased genome instability and whether a healthy diet with natural foods can improve genome stability in peripheral blood lymphocytes (PBLs). Seventy-six diabetic and 21 non-diabetic individuals were randomly assigned to either an ‘intervention’ or an ‘information only’ group. All participants received information about the beneficial effects of a healthy diet, while subjects of the intervention group received additionally 300g of vegetables and 25ml of plant oil rich in polyunsaturated fatty acids per day for 8 weeks. Chromosomal damage was assessed using the cytokinesis-block micronucleus (MN) cytome assay. Levels of chromosomal damage did not differ between diabetic and non-diabetic individuals. However, diabetic individuals with MN frequency above the high 50th percentile had significantly higher levels of fasting plasma glucose, glycosylated haemoglobin and were at higher risk for cardiovascular disease (CVD), assessed by the Framingham general cardiovascular risk score. Non-diabetic individuals with MN frequency above the 50th percentile had significantly lower vitamin B12 levels. The intervention with vegetables and plant oil led to significant increases in folate, γ-tocopherol, α- and β-carotene while vitamin B12 was significantly reduced. Levels of chromosomal damage were not altered, only apoptosis was slightly increased. The results suggest interactions between glycaemic control, CVD risk and genome stability in individuals with T2DM. However, a healthy diet does not improve genome damage in PBLs. [ABSTRACT FROM AUTHOR]
- Published
- 2013
15. In vitro DNA-damaging effects of intestinal and related tetrapyrroles in human cancer cells
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Mölzer, Christine, Pfleger, Barbara, Putz, Elisabeth, Roßmann, Antonia, Schwarz, Ursula, Wallner, Marlies, Bulmer, Andrew C., and Wagner, Karl-Heinz
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DNA damage , *TETRAPYRROLES , *INTESTINAL cancer , *CANCER cells , *EPIDEMIOLOGY , *CANCER risk factors , *BILIRUBIN - Abstract
Abstract: Epidemiological studies report a negative association between circulating bilirubin concentrations and the risk for cancer and cardiovascular disease. Structurally related tetrapyrroles also possess in vitro anti-genotoxic activity and may prevent mutation prior to malignancy. Furthermore, few data suggest that tetrapyrroles exert anti-carcinogenic effects via induction of cell cycle arrest and apoptosis. To further investigate whether tetrapyrroles provoke DNA-damage in human cancer cells, they were tested in the single cell gel electrophoresis assay (SCGE). Eight tetrapyrroles (unconjugated bilirubin, bilirubin ditaurate, biliverdin, biliverdin-/bilirubin dimethyl ester, urobilin, stercobilin and protoporphyrin) were added to cultured Caco2 and HepG2 cells and their effects on comet formation (% tail DNA) were assessed. Flow cytometric assessment (apoptosis/necrosis, cell cycle, intracellular radical species generation) assisted in revealing underlying mechanisms of intracellular action. Cells were incubated with tetrapyrroles at concentrations of 0.5, 5 and 17μM for 24h. Addition of 300μM tertiary-butyl hydroperoxide to cells served as a positive control. Tetrapyrrole incubation mostly resulted in increased DNA-damage (comet formation) in Caco2 and HepG2 cells. Tetrapyrroles that are concentrated within the intestine, including protoporphyrin, urobilin and stercobilin, led to significant comet formation in both cell lines, implicating the compounds in inducing DNA-damage and apoptosis in cancer cells found within organs of the digestive system. [Copyright &y& Elsevier]
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- 2013
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16. In vitro antioxidant capacity and antigenotoxic properties of protoporphyrin and structurally related tetrapyrroles.
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Mölzer, Christine, Huber, Hedwig, Steyrer, Andrea, Ziesel, Gesa, Ertl, Anita, Plavotic, Admira, Wallner, Marlies, Bulmer, Andrew Cameron, and Wagner, Karl-Heinz
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ANTIOXIDANTS , *PROTOPORPHYRINS , *TETRAPYRROLES , *BILIRUBIN , *UROBILIN , *SALMONELLA , *BIOTRANSFORMATION (Metabolism) - Abstract
The antioxidant properties of protoporphyrin IX and related tetrapyrroles are poorly characterized. Therefore, eight tetrapyrroles, five of which are produced in vivo, were tested to assess their antioxidant capacities in the Salmonella reverse mutation, TEAC, FRAP and ORAC assays. Tertiary-butyl hydroperoxide ( tert-BOOH) in the presence or absence of metabolic activation (±S9) was added to Salmonella strain TA102 together with the test compounds. In the absence of metabolic activation, the order of effectiveness was protoporphyrin > biliverdin > bilirubin ditaurate > bilirubin > biliverdin dimethyl ester > stercobilin > bilirubin dimethyl ester > urobilin. In the presence of S9, the effectiveness was reversed, with urobilin > biliverdin dimethyl ester > bilirubin dimethyl ester > stercobilin > biliverdin > bilirubin > bilirubin ditaurate > protoporphyrin. In the antioxidant capacity assays FRAP, TEAC and ORAC, mainly bilirubin, bilirubin ditaurate, biliverdin and protoporphyrin showed antioxidant activity. This study reports that previously untested tetrapyrroles of related structure prevent oxidatively induced genotoxicity, and for some, novel underlying mechanisms of antioxidant action were revealed. These results support the physiological importance and biological relevance of tetrapyrroles including protoporphyrin that might act as antioxidants, protecting from oxidatively induced DNA damage, particularly in the tissues/organs where they accumulate. [ABSTRACT FROM AUTHOR]
- Published
- 2012
- Full Text
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