Administration of the murine-selective β3 adrenoceptor agonist CL-316,243 corrects obesity and elevated blood glucose in diabetic rodents. This antiobesity effect is attributed to an increase in the thermogenic activity of brown adipose tissue (BAT). The antidiabetic effect is unknown, but has been attributed to the decline in body weight and plasma free fatty acids (FFAs). This study using the euglycemic-hyperinsulinemic clamp method was performed in nonobese, nondiabetic Sprague-Dawley rats fed normal rodent chow to determine if the β3 agonist could improve insulin sensitivity and/or responsiveness in the absence of weight loss or lowering of circulating FFAs. Subcutaneous miniosmotic pumps delivered either saline to control or 1 mg · kg−1 · day−1 of CL-316,243 for 10–12 days. Fed plasma glucose, insulin, and FFA levels were similar between the groups. Significant increases in food consumption, resting metabolic rates, and body core temperatures occurred, but only after 7 days of treatment. A 14% decrease in the respiratory quotient was also observed. Plasma glucose and insulin excursions in response to an oral glucose load (2 g/kg) on day 11 were unaltered. CL-316,243 treatment resulted in a decrease in abdominal and epididymal white fat pad weights, while interscapular brown adipose tissue (IBAT) weight doubled. Basal and insulin-stimulated whole-body glucose disposal rates were increased, while hepatic glucose output was suppressed to a greater extent in the CL-316,243 animals after 10 days of uninterrupted treatment. Chronic treatment with CL-316,243 resulted in an increase in basal and insulin-stimulated [3H]2-deoxy-glucose (2-DG) uptake by the retroperitoneal and epididymal white tissue and IBAT, but skeletal muscle 2-DG uptake under the same conditions was unaltered. These studies demonstrate that treatment with CL-316,243 improves basal and insulin-stimulated glucose disposal, and these effects occurred in the absence of a decrease in body weights and FFA concentrations. A particularly interesting observation was that the tissues responsible for this effect were white and brown adipose tissue, while skeletal muscle remained unaffected.
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Original Articles|
August 01 1997
CL-316,243, a β3-Specific Adrenoceptor Agonist, Enhances Insulin-Stimulated Glucose Disposal in Nonobese Rats
Christopher J de Souza;
Christopher J de Souza
Joslin Diabetes Center
Boston, Massachusetts
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Michael F Hirshman;
Michael F Hirshman
Joslin Diabetes Center
Boston, Massachusetts
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Edward S Horton
Edward S Horton
Joslin Diabetes Center
Boston, Massachusetts
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Address correspondence and reprint requests to Christopher de Souza, Metabolic and Cardiovascular Diseases, Novartis Pharmaceuticals, 59, Route 10, East Hanover, NJ 07936. [email protected].
1
2-DG, [3H]2-deoxy-glucose; ANOVA, analysis of variance; BAT, brown adipose tissue; β3-AR, β3-adrenoreceptor, FFA, free fatty acid; HGO, hepatic glucose output; IBAT, interscapular brown adipose tissue; RMR, resting metabolic rate; RQ, respiratory quotient; UCP, uncoupling protein.
Diabetes 1997;46(8):1257–1263
Article history
Received:
February 12 1997
Revision Received:
April 11 1997
Accepted:
April 11 1997
PubMed:
9231648
Citation
Christopher J de Souza, Michael F Hirshman, Edward S Horton; CL-316,243, a β3-Specific Adrenoceptor Agonist, Enhances Insulin-Stimulated Glucose Disposal in Nonobese Rats. Diabetes 1 August 1997; 46 (8): 1257–1263. https://doi.org/10.2337/diab.46.8.1257
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