Role of Adiponectin in the Development of High Fat Diet-induced Metabolic Abnormalities in Mice

Abstract

The adipokine adiponectin is decreased in severe obesity and is inversely associated with adipose mass. Adiponectin is associated with insulin sensitivity and cardioprotection. Obesity frequently results in the development of a “cardiometabolic syndrome” characterized by increased circulating insulin and leptin, and cardiac hypertrophy and dysfunction. This study examined if adiponectin-deficiency affects the development of metabolic and cardiac abnormalities in response to modest obesity. Mice were studied under normal conditions and with mild cardiac pressure-overload induced by abdominal aortic banding. After surgery, wild type and adiponectin-deficient mice were fed a high-fat diet for 8 weeks (45% energy from fat vs. 10%). In wild type mice the high-fat diet increased fat and whole body mass, which corresponded with elevated circulating insulin and leptin and a decrease the glucose/insulin ratio. On the other hand, in adiponectin-deficient mice the high-fat diet had less impact on body mass and no effect on fat mass, insulin, leptin, or glucose/insulin. There was modest cardiac hypertrophy with aortic banding, but no cardiac dysfunction or effects of adiponectin deficiency or diet. The results suggest that the increase in adipose mass, leptin and insulin induced by a high fat diet is dependent on adiponectin. The lack of accelerated cardiac hypertrophy and dysfunction in the adiponectin-deficient mice subjected to aortic banding and the high-fat diet suggest that adiponectin may not play a major role in protecting the heart during the early stages of diet-induced obesity.

Key words

heart - insulin - leptin - obesity

References

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