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Adipocyte apoptosis, a link between obesity, insulin resistance, and hepatic steatosis. | LitMetric

AI Article Synopsis

Article Abstract

Adipocyte death has been reported in both obese humans and rodents. However, its role in metabolic disorders, including insulin resistance, hepatic steatosis, and inflammation associated with obesity has not been studied. We now show using real-time reverse transcription-PCR arrays that adipose tissue of obese mice display a pro-apoptotic phenotype. Moreover, caspase activation and adipocyte apoptosis were markedly increased in adipose tissue from both mice with diet-induced obesity and obese humans. These changes were associated with activation of both the extrinsic, death receptor-mediated, and intrinsic, mitochondrial-mediated pathways of apoptosis. Genetic inactivation of Bid, a key pro-apoptotic molecule that serves as a link between these two cell death pathways, significantly reduced caspase activation, adipocyte apoptosis, prevented adipose tissue macrophage infiltration, and protected against the development of systemic insulin resistance and hepatic steatosis independent of body weight. These data strongly suggest that adipocyte apoptosis is a key initial event that contributes to macrophage infiltration into adipose tissue, insulin resistance, and hepatic steatosis associated with obesity in both mice and humans. Inhibition of adipocyte apoptosis may be a new therapeutic strategy for the treatment of obesity-associated metabolic complications.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2823448PMC
http://dx.doi.org/10.1074/jbc.M109.074252DOI Listing

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