Effect of hypophysectomy on energy balance and brown fat activity in obese Zucker rats

S. Holt, N. J. Rothwell, M. J. Stock, D. A. York

Research output: Contribution to journalArticlepeer-review

Abstract

Hypophysectomy (HYPX) in genetically obese (fa/fa) Zucker rats significantly reduced body weight and energy gains and stimulated energy expenditure (by 34%), the thermic response to food (by 144%), and brown adipose tissue (BAT) mitochondrial GDP-binding capacity (by 190%) compared with pair-fed, sham-operated obese rats. These changes in energy balance in obese HYPX rats were reversed by corticosterone replacement (1 mg/day), but the increased BAT activity was only partly restored to normal. HYPX had only small effects on energy balance in lean Zucker rats compared with pair-fed, sham-operated lean controls but increased the acute thermic response to food and BAT mitochondrial GDP-binding capacity; these effects were inhibited by replacement of HYPX rats with corticosterone. The results suggest that alterations in the hypothalamic-pituitary-adrenal axis play a fundamental role in the development and maintenance of genetic obesity.
Original languageEnglish
Pages (from-to)17/2
JournalAJP: Endocrinology and Metabolism
Volume254
Issue number2
Publication statusPublished - 1988

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