Role of adipocyte mitochondria in inflammation, lipemia and insulin sensitivity in humans: effects of pioglitazone treatment View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2018-02

AUTHORS

X Xie, S Sinha, Z Yi, P R Langlais, M Madan, B P Bowen, W Willis, C Meyer

ABSTRACT

BACKGROUND/OBJECTIVES: To gain further insight into the role of adipocyte mitochondria in systemic lipid metabolism, inflammation and insulin sensitivity in humans and to provide a better understanding of the mechanisms of action of the peroxisome proliferator-activated receptor gamma agonist pioglitazone. SUBJECTS/METHODS: Mitochondrial DNA (mtDNA) copy number, mitochondrial distribution, mitochondrial and overall cellular protein abundances as well as intrinsic mitochondrial function of subcutaneous adipocytes were assessed by real-time quantitative PCR, MitoTracker staining, global proteomics analyses and NADH cytochrome c reductase activity in insulin-sensitive, normal-glucose-tolerant (NGT) individuals and age, gender, adiposity-matched insulin-resistant individuals with abnormal glucose tolerant (AGT) before and after 3 months of pioglitazone treatment. RESULTS: mtDNA copy number/adipocyte and mtDNA copy number/adipocyte volume were ~55% and ~4-fold lower in AGT than in NGT, respectively, and correlated positively with the M-value of euglycemic clamps and high-density lipoprotein, and negatively with fasting plasma triglyceride, tumor necrosis factor-α and interleukin-6 levels in the entire cohort. mtDNA copy number/adipocyte volume also correlated positively with plasma adiponectin. Pioglitazone, which improved insulin sensitivity, plasma lipids and inflammation, increased the mitochondrial copy number, and led to a redistribution of mitochondria from a punctate to a more reticular pattern as observed in NGT. This was accompanied by disproportionately increased abundances of mitochondrial proteins, including those involved in fat oxidation and triglyceride synthesis. Pioglitazone also increased the abundance of collagen VI and decreased the abundance of cytoskeletal proteins. NADH cytochrome c reductase activity of isolated adipocyte mitochondria was similar in AGT and NGT and unaltered by pioglitazone. CONCLUSIONS: Adipocyte mitochondria are deficient in insulin-resistant individuals and correlate with systemic lipid metabolism, inflammation and insulin sensitivity. Pioglitazone induces mitochondrial biogenesis and reorganization as well as the synthesis of mitochondrial proteins including those critical for lipid metabolism. It also alters extracellular matrix and cytoskeletal proteins. The intrinsic function of adipocyte mitochondria appears unaffected in insulin resistance and by pioglitazone.International Journal of Obesity advance online publication, 31 October 2017; doi:10.1038/ijo.2017.192. More... »

PAGES

213

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/ijo.2017.192

DOI

http://dx.doi.org/10.1038/ijo.2017.192

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1091207408

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/29087390


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