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Am J Physiol Endocrinol Metab 272: E262-E266, 1997;
0193-1849/97 $5.00
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AJP - Endocrinology and Metabolism, Vol 272, Issue 2 E262-E266, Copyright © 1997 by American Physiological Society

ARTICLES

Electrical stimulation inactivates muscle acetyl-CoA carboxylase and increases AMP-activated protein kinase

C. A. Hutber, D. G. Hardie and W. W. Winder
Zoology Department, Brigham Young University, Provo, Utah 84602, USA.

Muscle malonyl-CoA decreases during exercise or electrical stimulation, the exercise-induced decline being accompanied by changes in the kinetic properties [maximal velocity (Vmax), activation constant (Ka), and citrate concentration required to produce 50% Vmax (K0.5)] of acetyl-CoAcarboxylase (ACC) and by an increase in the AMP-activated protein kinase activity (AMPK). This study was designed to ascertain whether the exercise-induced changes are contraction mediated and, if so, to follow the time course of these changes. The left sciatic nerve of rats was stimulated at 1 Hz for 0, 2, 5, 10, 20, or 30 min, and the gastrocnemius-plantaris muscle group was then excised, frozen in liquid nitrogen, and later analyzed for malonyl-CoA and other metabolites. ACC and AMPK activities were quantitated in ammonium sulfate precipitates from homogenates prepared from the frozen muscles. The Vmax and Ka of ACC for citrate decreased and increased, respectively, over the first 10 min of stimulation, but significantly increased AMPK activity was not observed until 10 to 20 min of stimulation (P < 0.05). Stimulation increased estimated free AMP (P < 0.05). Thus exercise-induced changes in functional properties of ACC appear to be contraction mediated and are accompanied by increased AMPK activity and an increase in the estimated free AMP.


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