Roles and tissue source of adiponectin involved in lifestyle modifications

The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
Yang DaiTie-Mei Zhang

Abstract

Calorie restriction and endurance exercise are known robust lifestyle modifications that delay the onset of type 2 diabetes and metabolic syndrome, however, its protective mechanism needs to be elucidated. To investigate the role of adiponectin in lifestyle modifications, male Sprague-Dawley rats were divided into groups of caloric restriction, exercise, and control for a 6-month intervention. Tissue and serum adiponectin levels, tissue expression of SIRT1, AMP-activated protein kinase (AMPK)α phosphorylation and AdipoR1, and insulin sensitivity were determined. All effects of adiponectin found in vivo were confirmed by L6 myoblast cells cultured with serum from a rat that received an intervention or by L6 cells with an AdipoR1 knockdown. Circulating adiponectin levels increased twofold to threefold in those rats in the caloric restriction and aerobic exercise groups, and adiponectin expression increased significantly not only in adipose tissue but also in skeletal muscle. The enhancement of SIRT1, AdipoR1 expression, and AMPKα phosphorylation in the skeletal muscle of the rats that underwent an intervention was simulated in the L6 myoblast cells cultured with serum from the intervention rats. The transferable effects of adipon...Continue Reading

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