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Skeletal muscle and exercise |
1 Department of Internal Medicine, State University of Campinas (UNICAMP), 13081-970-Campinas, São Paulo, Brazil
Lifestyle interventions including exercise programmes are cornerstones in the prevention of obesity-related diabetes. In this study, we demonstrate that a single bout of exercise inhibits high-fat diet-induced insulin resistance. Diet-induced obesity (DIO) increased the expression and activity of the protein tyrosine phosphatase 1B (PTP1B) and attenuated insulin signalling in gastrocnemius muscle of rats, a phenomenon which was reversed by a single session of exercise. In addition, DIO was observed to lead to serine phosphorylation of insulin receptor substrate 1 (IRS-1), which was also reversed by exercise in muscle in parallel with a reduction in c-Jun N-terminal kinase (JNK) activity. Thus, acute exercise increased the insulin sensitivity during high-fat feeding in obese rats. Overall, these results provide new insights into the mechanism by which exercise restores insulin sensitivity.
(Received 25 August 2006;
accepted after revision 25 September 2006;
first published online 28 September 2006)
Corresponding author J. B. C. Carvalheira: Departamento de Clínica, Médica, FCM-UNICAMP, Cidade Universitária Zeferino Vaz, Campinas, São Paulo, Brazil, 13081-970. Email: carvalheirajbc{at}uol.com.br
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