AMP-Activated Protein Kinase α1 Protects Against Diet-Induced Insulin Resistance and Obesity | Zendy

Weiyu Zhang | Zendy; Xianling Zhang | Zendy; Huan Wang | Zendy; Xin Guo | Zendy; Honggui Li | Zendy; Ying Wang | Zendy; Xin Xu | Zendy; Lyhun Tan | Zendy; Mara T. Mashek | Zendy; Chunxiang Zhang | Zendy; Yingjie Chen | Zendy; Douglas G. Mashek | Zendy; Marc Foretz | Zendy; Chuhong Zhu | Zendy; Huaijun Zhou | Zendy; Xu Liu | Zendy; Benoı̂t Viollet | Zendy; Chaodong Wu | Zendy; Yuqing Huo | Zendy

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AMP-Activated Protein Kinase α1 Protects Against Diet-Induced Insulin Resistance and Obesity

Author(s) -

Weiyu Zhang,

Xianling Zhang,

Huan Wang,

Xin Guo,

Honggui Li,

Ying Wang,

Xin Xu,

Lyhun Tan,

Mara T. Mashek,

Chunxiang Zhang,

Yingjie Chen,

Douglas G. Mashek,

Marc Foretz,

Chuhong Zhu,

Huaijun Zhou,

Xu Liu,

Benoı̂t Viollet,

Chaodong Wu,

Yuqing Huo

Publication year - 2012

Publication title -

diabetes

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.219

H-Index - 330

eISSN - 1939-327X

pISSN - 0012-1797

DOI - 10.2337/db11-1373

Subject(s) - ampk , insulin resistance , endocrinology , medicine , protein kinase a , metabolic syndrome , amp activated protein kinase , adipose tissue , proinflammatory cytokine , adipocyte , insulin , inflammation , biology , diabetes mellitus , kinase , microbiology and biotechnology

AMP-activated protein kinase (AMPK) is an essential sensor of cellular energy status. Defects in the α2 catalytic subunit of AMPK (AMPKα1) are associated with metabolic syndrome. The current study investigated the role AMPKα1 in the pathogenesis of obesity and inflammation using male AMPKα1-deficent (AMPKα1(-/-)) mice and their wild-type (WT) littermates. After being fed a high-fat diet (HFD), global AMPKα1(-/-) mice gained more body weight and greater adiposity and exhibited systemic insulin resistance and metabolic dysfunction with increased severity in their adipose tissues compared with their WT littermates. Interestingly, upon HFD feeding, irradiated WT mice that received the bone marrow of AMPKα1(-/-) mice showed increased insulin resistance but not obesity, whereas irradiated AMPKα1(-/-) mice with WT bone marrow had a phenotype of metabolic dysregulation that was similar to that of global AMPKα1(-/-) mice. AMPKα1 deficiency in macrophages markedly increased the macrophage proinflammatory status. In addition, AMPKα1 knockdown enhanced adipocyte lipid accumulation and exacerbated the inflammatory response and insulin resistance. Together, these data show that AMPKα1 protects mice from diet-induced obesity and insulin resistance, demonstrating that AMPKα1 is a promising therapeutic target in the treatment of the metabolic syndrome.

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