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Journal of Lipid Research, Vol. 47, 412-420, February 2006
Copyright © 2006 by American Society for Biochemistry and Molecular Biology
School of Kinesiology and Health Science, York University, Toronto, Canada
Published, JLR Papers in Press, November, 22, 2005.
1 To whom correspondence should be addressed. e-mail: roceddia{at}yorku.ca
The purpose of this study was to investigate the effects of long-chain fatty acids (LCFAs) on AMP-activated protein kinase (AMPK) and acetyl-coenzyme A carboxylase (ACC) phosphorylation and ß-oxidation in skeletal muscle. L6 rat skeletal muscle cells were exposed to various concentrations of palmitate (1–800 µM). Subsequently, ACC and AMPK phosphorylation and fatty acid oxidation were measured. A 2-fold increase in both AMPK and ACC phosphorylation was observed in the presence of palmitate concentrations as low as 10 µM, which was also accompanied by a significant increase in fatty acid oxidation. The effect of palmitate on AMPK and ACC phosphorylation was dose-dependent, reaching maximum increases of 3.5- and 4.5-fold, respectively. Interestingly, ACC phosphorylation was coupled with AMPK activation at palmitate concentrations ranging from 10 to 100 µM; however, at concentrations >200 µM, ACC phosphorylation and fatty acid oxidation remained high even after AMPK phosphorylation was completely prevented by the use of a selective AMPK inhibitor. This indicates that LCFAs regulate ACC activity by AMPK-dependent and -independent mechanisms, based on their abundance in skeletal muscle cells. Here, we provide novel evidence that the AMPK/ACC pathway may operate as a mechanism to sense and respond to the lipid energy charge of skeletal muscle cells.
Supplementary key words acetyl-coenzyme A carboxylase • fatty acid oxidation • lipid sensing
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