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Am J Physiol Endocrinol Metab 279: E622-E629, 2000;
0193-1849/00 $5.00
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Vol. 279, Issue 3, E622-E629, September 2000

UCP-3 expression in skeletal muscle: effects of exercise, hypoxia, and AMP-activated protein kinase

Min Zhou*, Bao-Zhen Lin*, Sean Coughlin, Gino Vallega, and Paul F. Pilch

Department of Biochemistry, Boston University School of Medicine, Boston, Massachusetts 02118

Uncoupling protein 3 (UCP-3), a member of the mitochondrial transporter superfamily, is expressed primarily in skeletal muscle where it may play a role in altering metabolic function under conditions of fuel depletion caused, for example, by fasting and exercise. Here, we show that treadmill running by rats rapidly (30 min) induces skeletal muscle UCP-3 mRNA expression (sevenfold after 200 min), as do hypoxia and swimming in a comparably rapid and substantial fashion. The expression of the mitochondrial transporters, carnitine palmitoyltransferase 1 and the tricarboxylate carrier, is unaffected under these conditions. Hypoxia and exercise-mediated induction of UCP-3 mRNA result in a corresponding four- to sixfold increase in rat UCP-3 protein. We treated extensor digitorum longus (EDL) muscle with 5'-amino-4-imidazolecarboxamide ribonucleoside (AICAR), a compound that activates AMP-activated protein kinase (AMPK), an enzyme known to be stimulated during exercise and hypoxia. Incubation of rat EDL muscle in vitro for 30 min with 2 mM AICAR causes a threefold increase in UCP-3 mRNA and a 1.5-fold increase of UCP-3 protein compared with untreated muscle. These data are consistent with the notion that activation of AMPK, presumably as a result of fuel depletion, rapidly regulates UCP-3 gene expression.

adenosine 5'-monophosphate-activated protein kinase; 5'-amino-4-imidazolecarboxamide ribonucleoside; rats

* Authors contributed equally to the study.   Address for reprint requests and other correspondence: P. F. Pilch, Dept. of Biochemistry, Boston Univ. School of Medicine, 715 Albany St., Boston, MA 02118 (E-mail: pilch{at}biochem.bumc.bu.edu).




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