Liver adapts mitochondrial function to insulin-resistant and diabetic states in mice
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE39752 | GEO | 2013/12/10
SECONDARY ACCESSION(S): PRJNA171581
REPOSITORIES: GEO
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Project description:Objective: To study if diabetic and insulin-resistant states lead to mitochondrial dysfunction in the liver, or alternatively, if there is adaption of mitochondrial function to these states in the long-term range. Results: High-fat diet (HFD) caused insulin resistance and severe hepatic lipid accumulation, but respiratory chain parameters were unchanged. Livers from insulin-resistant IR/IRS-1+/- mice had normal lipid contents and normal respiratory chain parameters, however showed mitochondrial uncoupling. Livers from severely hyperglycemic and hypoinsulimic, streptozotocin (STZ)-treated mice had massively depleted lipid levels, but respiratory chain abundance was unchanged. However, their mitochondria showed increased abundance and activity of the respiratory chain, which was better coupled compared to controls. Conclusions: Insulin resistance, either induced by obesity or by genetic manipulation, does not cause mitochondrial dysfunction in the liver of mice. However, severe insulin deficiency and high blood glucose levels in mice cause an enhanced performance of the respiratory chain, probably in order to maintain the high energy requirement of the unsuppressed gluconeogenesis. We performed gene expression microarray analysis on liver tissue derived from mice treated with STZ or standard diet (control).
2013-12-10 | E-GEOD-39752 | biostudies-arrayexpress
Project description:In this survey we effectively combined transcriptomics, proteomics and targeted-metabolomics to analyse the temporal relationship of alterations in liver preceding and accompanying the development of HFD-mediated hepatic insulin resistance. To assess HFD-mediated alterations in physiological parameters, insulin sensitivity, and molecular adaptations in liver male C3HeB/FeJ mice treated with a high-fat diet (HFD) for 7, 14, or 21 days and compared to age- matched controls fed low-fat diet (LFD). Data indicate early systemic increases in pro-inflammatory signals, in hepatic DAG but not hepatic TAG concentrations prior to development of hepatic insulin resistance. We propose a hypothesis via which a HFD-mediated increase in the hepatic long-chain acyl-carnitine moiety in liver alters mitochondrial membrane physiology and beta-oxidation rates, thereby contributing to oxidative stress and the development of insulin resistance in liver. Alterations in the enrichment of respiratory chain complex proteins, substrate transporters, VDACs, and long-chain carnitines in mitochondrial membranes likely affect mitochondrial membrane topology, membrane dynamics (fission and fusion) and bioenergetics as well as the cross-talk between the mitochondria and other cellular compartments. In conclusion, we emphasize a tight association between HFD-induced early modifications in the organisation of mitochondrial membranes paving the road for hepatic insulin resistance.
2018-03-08 | GSE48615 | GEO
Project description:Dietary supplementation with ω-3 polyunsaturated fatty acids (ω-3 PUFAs), specifically the fatty acids docosahexaenoic acid (DHA; 22:6 ω-3) and eicosapentaenoic acid (EPA; 20:5 ω-3), is known to have beneficial health effects including improvements in glucose and lipid homeostasis and modulation of inflammation. To evaluate the efficacy of two different sources of ω-3 PUFAs, we performed gene expression profiling in the liver of mice fed diets supplemented with either fish oil or krill oil. We found that ω-3 PUFA supplements derived from a phospholipid krill fraction (krill oil) downregulated the activity of pathways involved in hepatic glucose production as well as lipid and cholesterol synthesis. The data also suggested that krill oil-supplementation increases the activity of the mitochondrial respiratory chain. Surprisingly, an equimolar dose of EPA and DHA derived from fish oil modulated fewer pathways than a krill oil-supplemented diet and did not modulate key metabolic pathways regulated by krill oil, including glucose metabolism, lipid metabolism and the mitochondrial respiratory chain. Moreover, fish oil upregulated the cholesterol synthesis pathway, which was the opposite effect of krill supplementation. Neither diet elicited changes in plasma levels of lipids, glucose or insulin, probably because the mice used in this study were young and were fed a low fat diet. Further studies of krill oil supplementation using animal models of metabolic disorders and/or diets with a higher level of fat may be required to observe these effects. Twenty-one microarrays: three diets (CO, FO, KO) x seven mice per diet x one microarray per mouse
2011-07-21 | E-GEOD-29572 | biostudies-arrayexpress
Project description:Age-related hearing loss (AHL) is the progressive loss of auditory function with aging. The DBA/2J (DBA) mice have been used as a model of AHL and undergoes progressive, age-related hearing loss by 12 weeks of age. Here we analyzed cochlear gene expression of 7-week-old and 36-week-old DBA mice using microarrays. Auditory brainstem response (ABR) analysis confrimed that severe age-related hearing loss occured in 36-week-old mice, whereas moderate hearing loss occured in 7-week-old mice. Comprehensive gene expression analysis identified genes correlated with AHL and revealeed that 15 mitochondrial process categories, including â??mitochondrial electron transport chainâ??, â??oxidative phosphorylationâ??, â??respiratory chain complex Iâ??, â??respiratory chain complex IVâ??, and â??respiratory chain complex Vâ??, were statistically associated with AHL-correlated genes in the cochlea of 36-week-old DBA mice, and that 25 genes encoding components of the mitochondrial respiratory chain (respiratory chain complex I, IV, and V) were significantly down-regulated in the cochlea. These observations provide evidence that AHL is associated with down-regulation of genes involved in the mitochondrial respiratory chain in the cochlea of DBA mice, and suggest that mitochondrial respiratory chain dysfunction may be a key feature of AHL in mammalian cochlea. Experiment Overall Design: To determine the effects of age-related hearing loss, each 7-week-old sample (n = 3) was compared to each 36-week-old sample (n = 3), generating a total of nine pairwise comparisons. Using DAVIS and EASE, the identified genes were assign to â??GO: Biological Processâ?? categories of Gene Ontology Consortium. Furthermore, we used EASE to determine the total number of genes that were assigned to each biological process category, and to perform Fisher exact test. Quality control measures were not used. No replicates were done. Dye swap was not used.
2008-06-14 | E-GEOD-6045 | biostudies-arrayexpress
Project description:Age-related hearing loss (AHL) is the progressive loss of auditory function with aging. The DBA/2J (DBA) mice have been used as a model of AHL and undergoes progressive, age-related hearing loss by 12 weeks of age. Here we analyzed cochlear gene expression of 7-week-old and 36-week-old DBA mice using microarrays. Auditory brainstem response (ABR) analysis confrimed that severe age-related hearing loss occured in 36-week-old mice, whereas moderate hearing loss occured in 7-week-old mice. Comprehensive gene expression analysis identified genes correlated with AHL and revealeed that 15 mitochondrial process categories, including “mitochondrial electron transport chain”, “oxidative phosphorylation”, “respiratory chain complex I”, “respiratory chain complex IV”, and “respiratory chain complex V”, were statistically associated with AHL-correlated genes in the cochlea of 36-week-old DBA mice, and that 25 genes encoding components of the mitochondrial respiratory chain (respiratory chain complex I, IV, and V) were significantly down-regulated in the cochlea. These observations provide evidence that AHL is associated with down-regulation of genes involved in the mitochondrial respiratory chain in the cochlea of DBA mice, and suggest that mitochondrial respiratory chain dysfunction may be a key feature of AHL in mammalian cochlea. Keywords: Disease state analysis, Time course analysis
2007-10-16 | GSE6045 | GEO
Project description:Whether muscle mitochondrial dysfunction is the cause or consequence of metabolic disorders remains controversial. Herein, we demonstrate that inhibition of mitochondrial ATP synthase in muscle in vivo alters whole-body lipid homeostasis. Mice with restrained activity of the enzyme presented intrafiber lipid droplets, dysregulation of acyl-glycerides and higher visceral adipose tissue deposits, causing these animals to be prone to insulin resistance. This mitochondrial energy crisis increase lactate production, prevents fatty acid β-oxidation, and forces the catabolism of branched-chain amino acids (BCAA) to provide acetyl-CoA for de novo lipid synthesis. In turn, muscle acetyl-CoA accumulation feeds back to oxidative phosphorylation dysfunction through the acetylation-dependent inhibition of respiratory complex II that results in augmented ROS production. Finally, by screening 702 FDA-approved drugs, we identified edaravone as a potent mitochondrial antioxidant and enhancer. The edaravone-driven restoration of ROS and lipid homeostasis in skeletal muscle reestablished insulin sensitivity, thus suggesting that muscular mitochondrial perturbations are a direct cause in the setting of metabolic disorders and repurposing edaravone as a potential treatment for these diseases.
2020-07-06 | PXD017683 | Pride
Project description:Whether muscle mitochondrial dysfunction is the cause or consequence of metabolic disorders remains controversial. Herein, we demonstrate that inhibition of mitochondrial ATP synthase in muscle in vivo alters whole-body lipid homeostasis. Mice with restrained activity of the enzyme presented intrafiber lipid droplets, dysregulation of acyl-glycerides and higher visceral adipose tissue deposits, causing these animals to be prone to insulin resistance. This mitochondrial energy crisis increase lactate production, prevents fatty acid β-oxidation, and forces the catabolism of branched-chain amino acids (BCAA) to provide acetyl-CoA for de novo lipid synthesis. In turn, muscle acetyl-CoA accumulation feeds back to oxidative phosphorylation dysfunction through the acetylation-dependent inhibition of respiratory complex II that results in augmented ROS production. Finally, by screening 702 FDA-approved drugs, we identified edaravone as a potent mitochondrial antioxidant and enhancer. The edaravone-driven restoration of ROS and lipid homeostasis in skeletal muscle reestablished insulin sensitivity, thus suggesting that muscular mitochondrial perturbations are a direct cause in the setting of metabolic disorders and repurposing edaravone as a potential treatment for these diseases.
2020-07-06 | PXD017621 | Pride
Project description:Whether muscle mitochondrial dysfunction is the cause or consequence of metabolic disorders remains controversial. Herein, we demonstrate that inhibition of mitochondrial ATP synthase in muscle in vivo alters whole-body lipid homeostasis. Mice with restrained activity of the enzyme presented intrafiber lipid droplets, dysregulation of acyl-glycerides and higher visceral adipose tissue deposits, causing these animals to be prone to insulin resistance. This mitochondrial energy crisis increase lactate production, prevents fatty acid β-oxidation, and forces the catabolism of branched-chain amino acids (BCAA) to provide acetyl-CoA for de novo lipid synthesis. In turn, muscle acetyl-CoA accumulation feeds back to oxidative phosphorylation dysfunction through the acetylation-dependent inhibition of respiratory complex II that results in augmented ROS production. Finally, by screening 702 FDA-approved drugs, we identified edaravone as a potent mitochondrial antioxidant and enhancer. The edaravone-driven restoration of ROS and lipid homeostasis in skeletal muscle reestablished insulin sensitivity, thus suggesting that muscular mitochondrial perturbations are a direct cause in the setting of metabolic disorders and repurposing edaravone as a potential treatment for these diseases.
2020-07-06 | PXD017678 | Pride
Project description:The mitochondrial mutator mouse is a well-established model of premature aging in which a progeroid phenotype is driven by the accumulation of somatic mtDNA mutations. Despite evidence of bioenergetic disruption within the cardiac mitochondria, there is little information about the underlying changes to the mitochondrial proteome. Herein, nLC-MS/MS was used to interrogate the mitochondria-enriched proteome of cardiac and skeletal muscle tissues of mutator mice and wild-type littermates. The mitochondrial proteome from heart tissue was then correlated with previously reported respiratory conductance data generated from the same mitochondrial samples to identify protein biomarkers of respiratory insufficiency. The majority of proteins that were found to be significantly downregulated in mutator mitochondria were subunits of respiratory complexes I and IV, including both nuclear and mitochondrial-encoded proteins. Interestingly, the mitochondrial-encoded complex V subunits, were unchanged or upregulated in mutator mitochondria suggesting a robustness to mtDNA mutation. Finally, the protein most strongly correlated with respiratory conductance in heart mitochondria from wild-type and mutator mice was the phosphatase PPM1K, which has been shown to have roles in branched chain amino acid metabolism and mitochondria permeability transition. These results suggest that mitochondrial mutator mice undergo a specific loss of mitochondrial complexes I and IV that limit their respiratory function independent of an upregulation of complex V. Additionally, the role of PPM1K in responding to mitochondrial stress warrants further exploration.
2021-01-08 | PXD017000 | JPOST Repository
Project description:Dietary supplementation with ω-3 polyunsaturated fatty acids (ω-3 PUFAs), specifically the fatty acids docosahexaenoic acid (DHA; 22:6 ω-3) and eicosapentaenoic acid (EPA; 20:5 ω-3), is known to have beneficial health effects including improvements in glucose and lipid homeostasis and modulation of inflammation. To evaluate the efficacy of two different sources of ω-3 PUFAs, we performed gene expression profiling in the liver of mice fed diets supplemented with either fish oil or krill oil. We found that ω-3 PUFA supplements derived from a phospholipid krill fraction (krill oil) downregulated the activity of pathways involved in hepatic glucose production as well as lipid and cholesterol synthesis. The data also suggested that krill oil-supplementation increases the activity of the mitochondrial respiratory chain. Surprisingly, an equimolar dose of EPA and DHA derived from fish oil modulated fewer pathways than a krill oil-supplemented diet and did not modulate key metabolic pathways regulated by krill oil, including glucose metabolism, lipid metabolism and the mitochondrial respiratory chain. Moreover, fish oil upregulated the cholesterol synthesis pathway, which was the opposite effect of krill supplementation. Neither diet elicited changes in plasma levels of lipids, glucose or insulin, probably because the mice used in this study were young and were fed a low fat diet. Further studies of krill oil supplementation using animal models of metabolic disorders and/or diets with a higher level of fat may be required to observe these effects.
2011-07-22 | GSE29572 | GEO