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Decreased testosterone levels do not mediate short-photoperiod-induced brown fat changes

of Animal BARBARA Physiology, J. MOORE, University BARBARA A. HORWITZ of California, Davis, California Kom, KAYLEEN S.,BARBARA J. MOORE, BARBARA A. HORWITZ. Decreased testosterone levels do not mediate -induced changes. Am. J. Physiol. 251 (Regulatory Integrative Comp. Physiol. 20): R963-R970, 1986.-Previous studies showed that increased (BAT) mass reduced gonadal size gonadal hormone secretion in hamsters. The present study investigated the possibility that the effects on BAT were dependent on reduced levels of gonadal hormones. BAT from male Syrian hamsters exposed to for 10 wk was significantly greater in mass, protein content, total maximal citrate synthase p-hydroxyacyl-CoA dehydrogenase activities than was BAT from long- hamsters. These differences between - long- exposure were observed in hamsters housed at 21 as well as at 8°C. also increased the total recovered mitochondrial GDP binding, a finding consistent with increased BAT thermogenic capacity. These - effects were neither mimicked by castration of long- hamsters nor prevented by high levels of testosterone administered to - animals. Castration did attenuate the effects of on BAT growth if, after surgery prior to - exposure, the animals were housed at a long for 2-3 wk. In contrast, in hamsters immediately placed at after surgery, castration did not http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png AJP - Regulatory, Integrative and Comparative Physiology The American Physiological Society

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