PMID: 9192230Jun 1, 1997Paper

Appearance of brown adipocytes in white adipose tissue during CL 316,243-induced reversal of obesity and diabetes in Zucker fa/fa rats

International Journal of Obesity and Related Metabolic Disorders : Journal of the International Association for the Study of Obesity
M Ghorbani, J Himms-Hagen

Abstract

In our previous studies, chronic treatment of rats with a new beta 3-adrenoceptor agonist, CL 316,243, retarded diet-induced obesity and promoted thermogenesis in young animals and reversed established diet-induced obesity in older animals that continued to eat a high fat diet. Reversal of obesity was associated with shrinking of enlarged white adipocytes but the number of mature white adipocytes, which had not been increased by the diet, was not reduced. Drug-treatment induced appearance of abundant brown adipocytes in white adipose tissue (WAT) depots as well as hypertrophy of brown adipose tissue (BAT) in both lean and diet-induced obese rats. To find out whether the known hyperplasia of white adipocytes in the obese fa/fa rat could be reversed by CL 316,243-treatment and whether the grossly enlarged WAT depots of the obese fa/fa rat contain precursors to brown adipocytes. CL 316,243 infusion (1 mg/kg/d) reduced abdominal fat. The loss of fat was due to a decrease in white adipocyte size, with no loss of the markedly elevated number of adipocytes in the fa/fa rats. Resting metabolic rate increased by 40% in lean rats, by 70% in fa/fa rats. Food intake decreased in the hyperphagic fa/fa rats but did not change in lean rats, i...Continue Reading

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