Learning new tricks from old dogs: beta-adrenergic receptors teach new lessons on firing up adipose tissue metabolism

Molecular Endocrinology
Sheila CollinsJacques Robidoux

Abstract

The three beta AR (beta-adrenergic receptor) subtypes (beta(1)AR, beta(2)AR, and beta(3)AR) are members of the large family of G protein-coupled receptors, each of which is coupled to G alpha s and increases in intracellular cAMP levels. In white adipose tissues, catecholamine activation of the beta ARs leads to the mobilization of stored fatty acids and regulates release of several adipokines, whereas in brown adipose tissue they stimulate the specialized process of adaptive nonshivering thermogenesis. Noteworthy, in most models of obesity the beta AR system is dysfunctional, and its ability to stimulate lipolysis and thermogenesis are both impaired. Nevertheless, selective agonists for the beta(3)AR, a subtype that is found predominantly in adipocytes, have been able to prevent or reverse obesity and accompanying insulin resistance in animal models. Whether this is a viable therapeutic option for human obesity is much debated with regard to the existence of brown adipocytes in humans or their ability to be recruited. Nevertheless, probing the physiological changes in adrenoceptor function in rodent obesity, as well as the process by which beta(3)AR agonists promote a thermogenic shift in fuel use, have yielded unexpected new ...Continue Reading

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