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Bardoxolone methyl prevents insulin resistance and the development of hepatic steatosis in mice fed a high-fat diet
Illawarra Health and Medical Research Institute
  • Danielle Camer, University of Wollongong
  • Yinghua Yu, University of Wollongong
  • Alexander M Szabo, University of Wollongong
  • Hoang Lan Chi Dinh, University of Wollongong
  • Hongqin Wang, University of Wollongong
  • Licai Cheng, University of Wollongong
  • Xu-Feng Huang, University of Wollongong
RIS ID
101074
Publication Details

Camer, D., Yu, Y., Szabo, A., Dinh, C. H. L., Wang, H., Cheng, L. & Huang, X. (2015). Bardoxolone methyl prevents insulin resistance and the development of hepatic steatosis in mice fed a high-fat diet. Molecular and Cellular Endocrinology, 412 36-43.

Abstract
High-fat (HF) diet-induced obesity is a major risk factor for the development of insulin resistance and hepatic steatosis. We examined the hypothesis that bardoxolone methyl (BM) would prevent the development of insulin resistance and hepatic steatosis in mice fed a HF diet. C57BL/6J male mice were fed a lab chow (LC), HF (40% fat), or HF diet supplemented with 10 mg/kg/day BM orally for 21 weeks. Glucose metabolism was assessed using a glucose tolerance test (GTT) and insulin sensitivity test (IST). Signalling molecules involved in insulin resistance, inflammation, and lipid metabolism were examined in liver tissue via western blotting and RT-PCR. BM prevented HF diet-induced insulin resistance and alterations in the protein levels of protein tyrosine phosphatase 1B (PTP1B), forkhead box protein O1 (FOXO1) and BDNF, and expression of the insulin receptor (IR), IRS-1 and glucose-6-phosphatase (G6Pase) genes. Furthermore, BM prevented fat accumulation in the liver and decreases in the β-oxidation gene, peroxisomal acyl-coenzyme A oxidase 1 (ACOX) in mice fed a HF diet. In the livers of HF fed mice, BM administration prevented HF diet-induced macrophage infiltration, inflammation as indicated by reduced IL-6 and signal transducer and activator of transcription 3 (STAT3) protein levels and TNFα mRNA expression, and increased nuclear factor-like 2 (Nrf2) mRNA expression and nuclear protein levels. These findings suggest that BM prevents HF diet induced insulin resistance and the development of hepatic steatosis in mice fed a chronic HF diet through modulation of molecules involved in insulin signalling, lipid metabolism and inflammation in the liver.
Citation Information
Danielle Camer, Yinghua Yu, Alexander M Szabo, Hoang Lan Chi Dinh, et al.. "Bardoxolone methyl prevents insulin resistance and the development of hepatic steatosis in mice fed a high-fat diet" (2015) p. 36 - 43
Available at: http://works.bepress.com/xhuang/176/