The consequences of n-3 polyunsaturated fatty acids (PUFA) depletion on hepatic lipid metabolism in mice
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE26986 | GEO | 2011/08/26
SECONDARY ACCESSION(S): PRJNA135935
REPOSITORIES: GEO
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Project description:In the present study, we investigated the consequences of n-3 polyunsaturated fatty acids (PUFA) depletion on hepatic lipid metabolism in mice fed during three months with a diet presenting a high n-6/n-3 PUFA ratio to induce n-3 PUFA depletion. Microarray analyses were performed to identify the molecular targets involved in the development of hepatic steatosis associated with n-3 PUFA depletion. Male C57Bl/6J mice (9 weeks old) were housed in groups of four mice per cage at 22°C in a 12h light/dark cycle and given free access to diet and water. After an acclimatization period of 1 week, the mice were fed a control (CT) or an n-3 PUFA-depleted diet (DEF) for 3 months. At the end of the study period, mice (CT, n=6; DEF, n=7) were anesthetized after a 6h period of fasting. Some mice (CT: n=4 et DEF: n=7) were anesthetized without being starved. A fraction of the main liver lobe was fixed-frozen in isopentane and kept at -80°C for histological analysis. The excess tissue material was immediately clamped in liquid N2 and kept at -80°C. All mice experiments were approved by the local animal ethics committee, and the housing conditions were as specified by the Belgian Law of November 14, 1993 on the protection of laboratory animals (agreement n° LA 1230314).
2011-08-25 | E-GEOD-26986 | biostudies-arrayexpress
Project description:Fishoil or n-3 PUFA supplementation has shown some beneficial effects in patients with NASH. It is known that n-3 PUFA can influence hepatic gene expression. However, the effect of n-3 PUFA supplementation on hepatic gene expression has not been examined in patients with NASH. Aim of this pilot study was to examine the effect of n-3 PUFA supplementation on liver n-3 PUFA levels, hepatic gene expression and liver histology in patients with NASH. In a single-arm pilot intervention study, the effect of a one year n-3 PUFA supplementation on hepatic gene expression (Illumina Microarray), liver histology, and liver and erythrocyte PUFA was examined in 11 adult patients with NASH. For the intervention trial, NASH patients received n-3 PUFA supplementation from fish oil (2 g fish oil per day, containing 740-840 mg eicosapentaenoic acid (EPA) and 400-440 mg docosahexaenoic acid (DHA) quantified as ethyl ester) for one year. The supplement was produced by Ocean Nutrition Canada Ltd. (Dartmouth, NS, Canada) (product code 4020PB1000CT, Lots # 21211, 24168, and 31639). The selected supplement was within the range used in previous studies, where doses of n-3 PUFA and the EPA/DHA balance varied widely. Effects of n-3 PUFA on liver steatosis were observed in other studies by ultrasound within 6 to 12 months. To increase safety and acceptance of the second liver biopsy, an intervention period of 12 months was selected. During the intervention, patients were asked to maintain their habitual diet and physical activity. Fishoil supplementation lead to increased n-3 PUFA in erythrocyte total lipids and hepatic lipids. However, there was no significant change in liver histology or hepatic gene expression between baseline and post-intervention.
2019-09-30 | GSE96971 | GEO
Project description:in the present study, we evaluated whether microbiota modulation is able to restore hepatic steatosis induced by n-3 PUFA depletion in mice. For this purpose, mice were fed during three months with a n-3 PUFA-depleted diet (presenting a high n-6/n-3 PUFA ratio), and then supplemented with fructooligosaccharides (FOS, 0.25g/day/mice), a prebiotic, during the last ten days of the experiment (DEF/FOS). In the same time, some n-3 PUFA-depleted mice were returned on a control diet during the last 10 days of treatment (DEF/CT) to compare the effect of FOS supplementation to a restored intake in n-3 PUFA. Microarray analyses were performed to identify the molecular targets modified by FOS supplementation in the liver of n-3 PUFA depleted mice. These mice were compared to control mice (fed a control diet during the 112 days of experiment) and to n-3 PUFA-depleted mice (fed a n-3 PUFA-depleted diet during the 112 days of experiment) for which the results have been previously published (Pachikian B.D. et al. PLoS One. 2011;6(8):e23365, accession number GSE26986)
2012-12-12 | GSE31727 | GEO
Project description:We report a conserved transcriptomic signature of reduced fatty acid and lipid metabolism gene expression in human post-mortem ALS spinal cord and a Drosophila model of the most common genetic cause of FTD/ALS, a repeat expansion in C9orf72. To investigate lipid alterations, we performed lipidomics on C9FTD/ALS iPSC-neurons and post-mortem FTLD brain tissue. This revealed a common and specific reduction in phospholipid species containing polyunsaturated fatty acids (PUFAs). To determine whether this PUFA deficit contributes to neurodegeneration, we fed C9FTD/ALS flies PUFAs, which yielded a modest increase in survival. However, increasing PUFA levels specifically in neurons of the C9orf72 flies, by overexpressing fatty acid desaturase enzymes, led to a substantial extension of lifespan. Neuronal overexpression of fatty acid desaturases also suppressed stressor induced neuronal death in C9FTD/ALS patient iPSC-neurons. These data implicate neuronal fatty acid saturation in the pathogenesis of FTD/ALS and suggest that interventions to increase PUFA levels specifically within neurons will be beneficial.
2024-11-15 | GSE255099 | GEO
Project description:Dietary fat quality may influence skeletal muscle lipid handling and fat accumulation, thereby modulating insulin sensitivity. Objective: To examine acute effects of meals with various fatty acid (FA) compositions on skeletal muscle FA handling and postprandial insulin sensitivity in obese insulin resistant men. Design: In a single-blinded randomized crossover study, 10 insulin resistant men consumed three high-fat mixed-meals (2.6MJ). Meals were high in saturated FA (SFA), in monounsaturated FA (MUFA) or in polyunsaturated FA (PUFA). Fasting and postprandial skeletal muscle FA handling were examined by measuring arterio-venous concentration differences across forearm muscle. [2H2]-palmitate was infused intravenously to label endogenous triacylglycerol (TAG) and FFA in the circulation and [U-13C]-palmitate was added to the meal to label chylomicron-TAG. Skeletal muscle biopsies were taken to assess intramuscular lipid metabolism and gene expression. Results: Insulin and glucose responses (AUC) after SFA meal were significantly higher compared with PUFA meal (p=0.003 and 0.028, respectively). Uptake of TAG-derived FA was significantly lower in the early postprandial phase after PUFA meal as compared with other meals (AUC60-120, p<0.001). The PUFA meal induced less transcriptional downregulation of oxidative pathways compared with other meals. The fractional synthetic rate was higher in DAG and PL fraction after MUFA and PUFA meal. Conclusion: Intake of a PUFA meal reduced TAG-derived skeletal muscle FA uptake, which was accompanied by higher postprandial insulin sensitivity and a tendency towards a higher muscle lipid turnover. These data suggest that the effects of replacement of SFA by PUFA may contribute to less muscle lipid uptake and may be therefore protective against the development of insulin resistance. Keywords: expression profiling by array randomized crossover dietary intervention study
2012-02-21 | E-GEOD-31901 | biostudies-arrayexpress
Project description:in the present study, we evaluated whether microbiota modulation is able to restore hepatic steatosis induced by n-3 PUFA depletion in mice. For this purpose, mice were fed during three months with a n-3 PUFA-depleted diet (presenting a high n-6/n-3 PUFA ratio), and then supplemented with fructooligosaccharides (FOS, 0.25g/day/mice), a prebiotic, during the last ten days of the experiment (DEF/FOS). In the same time, some n-3 PUFA-depleted mice were returned on a control diet during the last 10 days of treatment (DEF/CT) to compare the effect of FOS supplementation to a restored intake in n-3 PUFA. Microarray analyses were performed to identify the molecular targets modified by FOS supplementation in the liver of n-3 PUFA depleted mice. These mice were compared to control mice (fed a control diet during the 112 days of experiment) and to n-3 PUFA-depleted mice (fed a n-3 PUFA-depleted diet during the 112 days of experiment) for which the results have been previously published (Pachikian B.D. et al. PLoS One. 2011;6(8):e23365, accession number GSE26986) Male C57Bl/6J mice (9 weeks old; Charles River, Brussels, Belgium) were housed in groups of 4 mice per cage at 22°C in a 12 h light/dark cycle and given free access to diet and water. After an acclimatisation period of 1 week, mice were fed a control (CT) (D08041805, Research Diets, New Brunswick, USA) or an n-3 PUFA-depleted diet (DEF) (D08041806, Research Diets, New Brunswick, USA) for 112 days ad libitum. The CT diet contained the following (percent w/w): casein 20, total carbohydrate 72.4 (including corn starch 44.2, sucrose 10, maltodextrin 13.2, cellulose 5), soybean oil 5, mineral mix 3.5 and vitamin mix 1. The depletion was induced by replacing the soybean oil with sunflower oil, which exhibited a higher n-6/n-3 PUFA ratio. The n-6/n-3 PUFA ratio was 6.9 and 127.2 for the CT diet and the DEF diet, respectively. Ten days before the end of the experiment, DEF mice were divided into three groups: DEF, DEF/FOS and DEF/CT mice. The DEF mice were still fed with the n-3 PUFA depleted diet (DEF). The DEF/FOS mice were still fed the DEF diet and were supplemented for 10 days with fructooligosaccharides (DEF/FOS). FOS (Beneo P95 gift from Orafti; Tienen, Belgium) was added to tap water in a concentration adequate to reach an intake of 0.25g of FOS per day. For DEF/CT mice, the DEF diet was replaced by the CT diet during the last 10 days of treatment. At the end of the study period, mice fed the CT (n=4), DEF (n=7), DEF/CT (n=8) or DEF/FOS diet (n=8) were anaesthetised (ketamine/xylazine i.p., 100 and 10 mg/kg of body weight, respectively). The liver tissue was immediately clamped in liquid N2 and kept at -80°C until analysis. All mice experiments were approved by the local animal ethics committee and the housing conditions were as specified by the Belgian Law of April 6, 2010 on the protection of laboratory animals (agreement n° LA 1230314).
2012-12-12 | E-GEOD-31727 | biostudies-arrayexpress
Project description:Dietary fat quality may influence skeletal muscle lipid handling and fat accumulation, thereby modulating insulin sensitivity. Objective: To examine acute effects of meals with various fatty acid (FA) compositions on skeletal muscle FA handling and postprandial insulin sensitivity in obese insulin resistant men. Design: In a single-blinded randomized crossover study, 10 insulin resistant men consumed three high-fat mixed-meals (2.6MJ). Meals were high in saturated FA (SFA), in monounsaturated FA (MUFA) or in polyunsaturated FA (PUFA). Fasting and postprandial skeletal muscle FA handling were examined by measuring arterio-venous concentration differences across forearm muscle. [2H2]-palmitate was infused intravenously to label endogenous triacylglycerol (TAG) and FFA in the circulation and [U-13C]-palmitate was added to the meal to label chylomicron-TAG. Skeletal muscle biopsies were taken to assess intramuscular lipid metabolism and gene expression. Results: Insulin and glucose responses (AUC) after SFA meal were significantly higher compared with PUFA meal (p=0.003 and 0.028, respectively). Uptake of TAG-derived FA was significantly lower in the early postprandial phase after PUFA meal as compared with other meals (AUC60-120, p<0.001). The PUFA meal induced less transcriptional downregulation of oxidative pathways compared with other meals. The fractional synthetic rate was higher in DAG and PL fraction after MUFA and PUFA meal. Conclusion: Intake of a PUFA meal reduced TAG-derived skeletal muscle FA uptake, which was accompanied by higher postprandial insulin sensitivity and a tendency towards a higher muscle lipid turnover. These data suggest that the effects of replacement of SFA by PUFA may contribute to less muscle lipid uptake and may be therefore protective against the development of insulin resistance. Keywords: expression profiling by array
2012-02-21 | GSE31901 | GEO
Project description:The pathogenesis of non-alcoholic fatty liver disease (NAFLD) is associated with abnormalities of liver lipid metabolism, especially with the accumulation of saturated fatty acids (FA). On the contrary, a diet enriched with n-3 polyunsaturated FA (n-3-PUFA) has been reported to ameliorate the progression of NAFLD. The aim of our study was to investigate the impact of dietary n-3-PUFA enrichment on the development of NAFLD and liver lipidome. Mice were fed for 6 weeks either high-fat methionine choline-deficient diet (MCD) or standard chow (two groups fed MCD, two control groups, both with or without n-3-PUFA). Genome-wide transcriptome analysis of liver tissue was performed and revealed differences in liver mRNA transcriptomes after MCD as well as n-3-PUFA administration.
2023-12-14 | E-MTAB-13399 | biostudies-arrayexpress
Project description:Metabolic diseases are closely linked to aberrant synthesis of endogenous fatty acids in the liver, called de novo lipogenesis (DNL), which is mediated by the enzyme fatty acid synthase (FASN). The composition of complex lipids consists of saturated or monosaturated fatty acids, which can be endogenously produced, and polyunsaturated fatty acids (PUFA), which are strictly dietary. Compositional differences between individuals are insufficiently understood and may influence the onset and progression of metabolic and cardiovascular diseases. Here we show that DNL critically determines the use of dietary PUFA. A patient with a hypofunctional heterozygous de novo Arg2177Cys variant in FASN exhibited an elevated composition of PUFA, which was phenocopied by pharmacological inhibition of FASN with TVB-2640 in patients with nonalcoholic steatohepatitis (NASH). In mice, the incorporation rate of supplemented omega-3 PUFA during an obesogenic diet was increased by genetic or pharmacologic reduction of DNL. Mechanistically, we show that the FASN variant exhibited a cysteine-dependent, non-enzymatic acetylation of FASN, which resulted in hyperubiquitinylation and decreased protein stability. Our study further reveals that PUFA storage is an active, enzymatic process controlled by FASN, diacylglycerol O-acyltransferase 2 (DGAT2) and MFSD2A, a membrane-transport protein, and that combining FASN inhibition and PUFA supplementation exerts additive beneficial metabolic effects. These findings provide evidence that the success of PUFA supplementation may depend on the rate of endogenous DNL and that combined PUFA supplementation and FASN inhibition may be a promising approach targeting metabolic disease.
2023-12-19 | PXD045908 | Pride
Project description:Monounsaturated fatty acid (MUFA) oleic acid (OA) has been reported to restore saturated fatty acid palmitic acid (PA)-induced hepatic insulin resistance (IR). However, the detailed molecular mechanism remains elusive. In addition, -3 polyunsaturated fatty acid (PUFA) such as Eicosapentaenoic acid (EPA) has also exerted opposite effects to PA in muscle IR. But whether it plays the same role in hepatic IR and the possible mechanism involved needs to be further explored. Here, we compared the proteome change of HepG2 cells after different fatty acids treatment.
2019-07-11 | PXD012065 | Pride