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AJP - Regulatory, Integrative and Comparative Physiology, Vol 262, Issue 6 1106-R1110, Copyright © 1992 by American Physiological Society
ARTICLES |
S. Okada, D. A. York and G. A. Bray
Pennington Biomedical Research Center, Baton Rouge, Louisiana 70808.
The effect of mifepristone (RU 486), a blocker of type II glucocorticoid receptors on the development of obesity that follows the feeding of a high-fat (HF) diet to Osborne-Mendel (OM) rats, has been investigated. OM rats fed a HF diet gained more weight and had larger retroperitoneal and parametrial fat pads than OM rats fed a high-carbohydrate low-fat (LF) diet. RU 486 (30 mg.kg-1.day-1) for 14 days completely reversed the body weight gain and the increase in fat pad size of OM rats fed a HF diet. RU 486 had no effect on body weight of OM rats fed a LF diet, but did reduce fat pad weights. The data suggest that type II glucocorticoid receptor activity modulates body fat deposition and is essential for the development of obesity, although a minor role for progestin receptor activity cannot be ruled out.
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