en
Scientific article
English

Targeted gene disruption reveals a leptin-independent role for the mouse beta3-adrenoceptor in the regulation of body composition

Published inThe Journal of clinical investigation, vol. 100, no. 5, p. 1098-1106
Publication date1997
Abstract

Targeted disruption of mouse beta3-adrenoceptor was generated by homologous recombination, and validated by an acute in vivo study showing a complete lack of effect of the beta3-adrenoceptor agonist CL 316,243 on the metabolic rate of homozygous null (-/-) mice. In brown adipose tissue, beta3-adrenoceptor disruption induced a 66% decrease (P < 0.005) in beta1-adrenoceptor mRNA level, whereas leptin mRNA remained unchanged. Chronic energy balance studies in chow-fed mice showed that in -/- mice, body fat accumulation was favored (+41%, P < 0.01), with a slight increase in food intake (+6%, NS). These effects were accentuated by high fat feeding: -/- mice showed increased total body fat (+56%, P < 0.025) and food intake (+12%, P < 0.01), and a decrease in the fat-free dry mass (-10%, P < 0.05), which reflects a reduction in body protein content. Circulating leptin levels were not different in -/- and control mice regardless of diet. The significant shift to the right in the positive correlation between circulating leptin and percentage of body fat in high fat-fed -/- mice suggests that the threshold of body fat content inducing leptin secretion is higher in -/- than in control mice. Taken together, these studies demonstrate that beta3-adrenoceptor disruption creates conditions which predispose to the development of obesity.

Keywords
  • Adipose Tissue/physiology
  • Animals
  • Blotting, Northern
  • Body Composition
  • Body Temperature Regulation
  • Cells, Cultured
  • Dietary Fats/administration & dosage
  • Energy Metabolism
  • Leptin
  • Male
  • Mice
  • Proteins/analysis/ physiology
  • Receptors, Adrenergic, beta/genetics/ physiology
  • Receptors, Adrenergic, beta-1/physiology
  • Receptors, Adrenergic, beta-3
  • Receptors, Leptin
Citation (ISO format)
REVELLI, J. P. et al. Targeted gene disruption reveals a leptin-independent role for the mouse beta3-adrenoceptor in the regulation of body composition. In: The Journal of clinical investigation, 1997, vol. 100, n° 5, p. 1098–1106. doi: 10.1172/JCI119620
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ISSN of the journal0021-9738
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