Abstract
Recent investigations have demonstrated that activation of 11beta-hydroxysteroid dehydrogenase type 1 (11beta-HSD1) in liver and adipose tissue is closely related to the pathogenesis of obesity and diabetes. However, the relationship between alteration of 11beta-HSD1 and the pathogenesis of type 2 diabetes in skeletal muscle is still unclear. A rat model of Type 2 diabetes was developed by high fat diet feeding combined with multiple low dose streptozotocin injection (30 mg/kg, i.p. twice). Intraperitoneal glucose tolerance test, insulin tolerance test were performed. Fasting blood glucose, fasting insulin, total cholesterol, triglyceride were measured. The protein and mRNA level of 11beta-HSD1 and glucocorticoid receptor in gastrocnemius muscle were determined. The alteration of insulin signaling pathway related protein was investigated. We found that the protein levels of 11beta-HSD1 and glucocorticoid receptor were significantly increased (P < 0.05); the mRNA level of 11beta-HSD1 was also elevated (P < 0.05); the mRNA level of glucocorticoid receptor was decreased (P < 0.05). After insulin stimulation, diabetic rats had no significant changes in the level of the insulin receptor beta-subunit (IR-beta), AKT, as in phosphoryla...Continue Reading
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