Effect of bisphenol-A on insulin signal transduction and glucose oxidation in skeletal muscle of adult male albino rat.
The estrogenic monomer bisphenol-A (BPA) is an endocrine-disrupting chemical used in the production of epoxy resins, plastic food and beverage containers, leading to ubiquitous human exposure. Environmentally relevant doses of BPA have profound effects on mice endocrine pancreas. It increases pancreatic insulin content and favors postprandial hyperinsulinemia and insulin resistance in male mice. Skeletal muscle plays a crucial role in maintaining systemic glucose metabolism. In the present study, we investigated the possible effects of BPA on insulin-signaling molecules and glucose oxidation in skeletal muscle of male rat. Adult male Wistar albino rats were divided into three groups. Group I: control (vehicle treated) and groups II and III were administered with BPA orally (20 and 200 mg/kg bw/day, respectively). Although there was no change in the levels of insulin receptor (IR), Akt (protein kinase B) and glucose transporter-4 (GLUT4) messenger RNA, BPA significantly decreased the IR, Akt and GLUT4 protein levels (both plasma membrane and cytosolic fraction) of the gastrocnemius muscle. There was an increase in serum insulin and decrease in serum testosterone levels but fasting blood glucose level remained unaltered. In conclusion, BPA has adverse effects on phosphorylation of Akt, GLUT4 translocation and (14)C-glucose oxidation.
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CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL GENE-N GENE-Y GENE-N CHEMICAL GENE-N GENE-Y GENE-N GENE-N GENE-N GENE-Y GENE-Y GENE-N GENE-N GENE-Y CHEMICAL GENE-Y GENE-Y GENE-N CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL
BPA glucose BPA glucose BPA bisphenol-A glucose Akt GLUT4 insulin epoxy Akt GLUT4 insulin insulin insulin insulin receptor IR Akt protein kinase B glucose transporter-4 testosterone GLUT4 IR insulin glucose BPA (14)C-glucose BPA bisphenol-A BPA glucose