{"doi":"10.1530/eje.0.1360429","title":"Anti-obesity and anti-diabetic effects of CL316,243, a highly specific β3-adrenoceptor agonist, in Otsuka Long-Evans Tokushima Fatty rats: induction of uncoupling protein and activation of glucose transporter 4 in white fat","abstract":"<jats:title>Abstract</jats:title>\n        <jats:p>The anti-obesity and anti-diabetic effects of a highly specific β<jats:sub>3</jats:sub>-adrenoceptor agonist, CL316.243 (CL; β<jats:sub>1</jats:sub>:β<jats:sub>2</jats:sub>:β<jats:sub>3</jats:sub>=0:1:100 000), were investigated in Otsuka Long-Evans Tokushima Fatty (fatty) and LongEvans Tokushima Otsuka (control) rats. Daily injection of CL (0·1 mg/kg, s.c.) to these rats (10 weeks old) for 14 weeks caused a significant reduction in body weight (fatty, 27% control, 15%), associated with a marked decrease in fat pad weight (inguinal: fatty, 60%; control, 36%; retroperitoneal: fatty, 75%; control, 77%) without affecting food intake. The levels of uncoupling protein mRNA and protein levels of uncoupling protein (UCP), as well as guanosine 5′-diphosphate-binding (a reliable index of thermogenesis) in brown adipose tissue, were lower in the fatty than in the control rats. However, after CL treatment, these parameters in brown adipose tissue increased significantly 2- to 3-fold in both groups. Furthermore, uncoupling protein was induced in white adipose tissue as well as in brown adipose tissue. The fatty rats showed hyperglycemia and hyperinsulinemia during the glucose tolerance test, but CL ameliorated these parameters.</jats:p>\n        <jats:p>These findings suggest that decreased thermogenesis in brown adipose tissue may be one of the causes of obesity in the fatty rats and that administration of CL prevents obesity by decreasing white fat mass, by activating brown adipose tissue thermogenesis, and by inducing uncoupling protein in white adipose tissue. Furthermore, CL treatment may inhibit diabetes mellitus by ameliorating obesity and by activating glucose transporter 4 in white adipose tissue and brown adipose tissue.</jats:p>\n        <jats:p><jats:italic>European Journal of Endocrinology</jats:italic> <jats:bold>136</jats:bold> 429–437</jats:p>","journal":"European Journal of 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