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Am J Physiol Endocrinol Metab 266: E993-E1000, 1994;
0193-1849/94 $5.00
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AJP - Endocrinology and Metabolism, Vol 266, Issue 6 E993-1000, Copyright © 1994 by American Physiological Society

ARTICLES

Effect of adrenalectomy on glucose tolerance and lipid metabolism in gold-thioglucose obese mice

S. C. Blair, I. D. Caterson and G. J. Cooney
Department of Endocrinology, Royal Prince Alfred Hospital, Camperdown, New South Wales, Australia.

The effect of adrenalectomy (ADX) on body weight, lipogenesis, and glucose tolerance was investigated in mice made obese by a single intraperitoneal injection of gold-thioglucose (GTG). Five weeks after ADX the weight of GTG-obese mice was significantly decreased (GTG-obese+sham-ADX: 39.8 +/- 0.8 g; GTG-obese+ADX: 27.6 +/- 1.1 g; P < 0.05). ADX also reduced serum glucose (GTG-obese+sham-ADX: 16.5 +/- 0.6 mmol/l; GTG-obese+ADX: 10.8 +/- 0.5 mmol/l; P < 0.05) and serum insulin concentrations (GTG-obese+sham-ADX: 197 +/- 36 microU/ml; GTG-obese+ADX: 38 +/- 7 microU/ml; P < 0.05) of fed GTG-obese mice and greatly improved glucose tolerance. ADX lowered liver glycogen content and reduced the fatty acid content of liver, epididymal white adipose tissue (WAT), and interscapular brown adipose tissue (BAT) of fed GTG-obese mice. Lipid synthesis in liver and WAT of GTG-obese mice was decreased by ADX, but lipogenesis in BAT was increased, possibly to provide substrate for increased thermogenesis in this tissue. Effects of ADX on metabolism were not confined to GTG-injected mice, as ADX also reduced body weight and altered the glucose tolerance of age-matched control mice. ADX increased lipid synthesis in liver, WAT, and BAT of fed control mice without an increase in lipid deposition, indicating that there was increased lipid turnover in these lipogenic tissues of ADX mice. ADX reduced the fasting blood glucose concentration of both control and GTG-obese mice to a level below that of sham-ADX control mice (sham-ADX control: 6.0 +/- 0.4 mM; ADX control: 2.9 +/- 0.5 mM; ADX GTG-obese: 3.3 +/- 0.2 mM).(ABSTRACT TRUNCATED AT 250 WORDS)


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