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Deficiency in N rf2 transcription factor decreases adipose tissue mass and hepatic lipid accumulation in leptin‐deficient mice
Author(s) -
Xu Jialin,
Donepudi Ajay C.,
More Vijay R.,
Kulkarni Supriya R.,
Li Liya,
Guo Liangran,
Yan Bingfang,
Chatterjee Tapan,
Weintraub Neal,
Slitt Angela L.
Publication year - 2015
Publication title -
obesity
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.438
H-Index - 199
eISSN - 1930-739X
pISSN - 1930-7381
DOI - 10.1002/oby.20929
Subject(s) - endocrinology , medicine , white adipose tissue , adipose tissue , insulin resistance , dyslipidemia , chemistry , adipose tissue macrophages , triglyceride , lipid metabolism , insulin , biology , cholesterol , diabetes mellitus
Objective To evaluate whether Nrf2 deficiency impacts insulin resistance and lipid accumulation in liver and white adipose tissue. Methods Lep ob/ob mice (OB) with targeted Nrf2 deletion (OB‐Nrf2KO) were generated. Pathogenesis of obesity and type 2 diabetes was measured in C57BL/6J, Nrf2KO, OB, and OB‐Nrf2KO mice. Hepatic lipid content, lipid clearance, and very low‐density lipoprotein (VLDL) secretion were determined between OB and OB‐Nrf2KO mice. Results OB‐Nrf2KO mice exhibited decreased white adipose tissue mass and decreased adipogenic and lipogenic gene expression compared with OB mice. Nrf2 deficiency prolonged hyperglycemia in response to glucose challenge, which was paralleled by reduced insulin‐stimulated Akt phosphorylation. In OB mice, Nrf2 deficiency decreased hepatic lipid accumulation, decreased peroxisome proliferator‐activated receptor γ expression and nicotinamide adenine dinucleotide phosphate (NADPH) content, and enhanced VLDL secretion. However, this observation was opposite in lean mice. Additionally, OB‐Nrf2KO mice exhibited increased plasma triglyceride content, decreased HDL‐cholesterol content, and enhanced apolipoprotein B expression, suggesting Nrf2 deficiency caused dyslipidemia in these mice. Conclusions Nrf2 deficiency in Lep ob/ob mice reduced white adipose tissue mass and prevented hepatic lipid accumulation but induced insulin resistance and dyslipidemia. This study indicates a dual role of Nrf2 during metabolic dysregulation—increasing lipid accumulation in liver and white adipose tissue but preventing lipid accumulation in obese mice.