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Am J Physiol Regul Integr Comp Physiol 270: R755-R760, 1996;
0363-6119/96 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 270, Issue 4 755-R760, Copyright © 1996 by American Physiological Society

ARTICLES

Perinatal expression of adenylyl cyclase subtypes in rat brown adipose tissue

A. Chaudhry, L. A. Muffler, R. Yao and J. G. Granneman
Department of Psychiatry and Behavioral Neurosciences, Wayne State University School of Medicine, Detroit, Michigan 48201, USA.

The ability of norepinephrine to stimulate adenylyl cyclase (AC) activity increases during the perinatal period in rat brown adipose tissue (BAT), and this increase is associated with changes in the activities of both GS alpha and AC. The purpose of this study was to determine which AC subtypes are present in neonatal BAT and to examine whether the perinatal increase in AC activity corresponds to an increase in the expression of a particular AC subtype. Analysis of AC mRNAs by nuclease protection assay demonstrated the presence of mRNAs encoding AC-III, AC-IV, AC-VI, and AC-IX in embryonic and postnatal BAT. Of the subtypes detected, only AC-III mRNA levels increased substantially during the perinatal period. The increase in AC-III expression was paralleled by an increase in isoproterenol-stimulated AC activity. Treatment of neonates was the sympathetic neurotoxin 6-hydroxydopamine abolished the perinatal increase in both AC activity and AC-III mRNA levels but had no effect on the expression of other AC subtypes. These results strongly indicate that the increase in AC activity during the perinatal period is due to an increase in the expression of AC-III.


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