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Title

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

Authors
Revelli, J. P.
Preitner, F.
Samec, S.
Muniesa, P.
Kuehne, F.
Boss, O.
Dulloo, A.
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Published in Journal of Clinical Investigation. 1997, vol. 100, no. 5, p. 1098-1106
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/physiologyAnimalsBlotting, NorthernBody CompositionBody Temperature RegulationCells, CulturedDietary Fats/administration & dosageEnergy MetabolismLeptinMaleMiceProteins/analysis/ physiologyReceptors, Adrenergic, beta/genetics/ physiologyReceptors, Adrenergic, beta-1/physiologyReceptors, Adrenergic, beta-3Receptors, Leptin
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PMID: 9276726
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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: Journal of Clinical Investigation, 1997, vol. 100, n° 5, p. 1098-1106. https://archive-ouverte.unige.ch/unige:8987

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Deposited on : 2010-07-12

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