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. 1994 Jan 1;297 ( Pt 1)(Pt 1):93-7.
doi: 10.1042/bj2970093.

Expression of beta 1- and beta 3-adrenergic-receptor messages and adenylate cyclase beta-adrenergic response in bovine perirenal adipose tissue during its transformation from brown into white fat

L Casteilla  1 , P Muzzin, J P Revelli, D Ricquier, J P Giacobino
Affiliations

Expression of beta 1- and beta 3-adrenergic-receptor messages and adenylate cyclase beta-adrenergic response in bovine perirenal adipose tissue during its transformation from brown into white fat

L Casteilla et al. Biochem J. .

Abstract

Possible modifications of the beta-adrenergic effector system during the development of bovine perirenal brown adipose tissue (BAT) in utero and its transformation into white-like adipose tissue after birth were studied. The parameters assessed were the level of expression of beta 1-, beta 2- and beta 3-adrenergic receptor (AR) mRNAs and the response of the plasma-membrane adenylate cyclase to (-)-isoprenaline and to the beta 3-agonist BRL 37344. The beta 3-AR mRNA was found to be expressed very early in utero, i.e. before the third month of foetal life. Then it increased dramatically (9-fold) between month 6 of foetal life and birth. A high beta 3-AR mRNA level was maintained after birth up to an age of 3 months. After conversion of BAT into white-like adipose tissue, i.e. in the adult bovine, the beta 3-AR mRNA expression became small or not detectable, and the beta 1-AR mRNA, which was expressed much less than the beta 3-AR mRNA in foetal life, became predominant. A response of the adenylate cyclase to (-)-isoprenaline was observed in foetal life (3.1-fold stimulation). It decreased after birth (1.8-fold stimulation) and then remained constant until adulthood. A response to BRL 37344 was also observed in foetal life (1.8-fold stimulation). It was maintained after birth, but disappeared in the adult. A possible relationship between the beta-AR expression and the adenylate cyclase response to (-)-isoprenaline on the one hand and the uncoupling-protein expression on the other is discussed. The bovine might represent a good model to understand the transition from brown to white fat in the human.

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