Nitric oxide and AMPK cooperatively regulate PGC-1 in skeletal muscle cells.

The Journal of Physiology
Vitor A LiraDavid S Criswell

Abstract

Nitric oxide (NO) induces mitochondrial biogenesis in skeletal muscle cells via upregulation of the peroxisome proliferator-activated receptor-γ coactivator 1α (PGC-1α). Further, we have shown that nitric oxide interacts with the metabolic sensor enzyme, AMPK. Therefore, we tested the hypothesis that nitric oxide and AMPK act synergistically to upregulate PGC-1α mRNA expression and stimulate mitochondrial biogenesis in culture. L6 myotubes treated with nitric oxide donors, S-nitroso-N-penicillamine (SNAP, 25 μM) or diethylenetriamine-NONO (DETA-NO, 50 μM), exhibited elevated AMPK phosphorylation, PGC-1α mRNA and protein, and basal and uncoupled mitochondrial respiration (P < 0.05). Pre-treatment of cultures with the AMPK inhibitor, Compound C, prevented these effects. Knockdown of AMPKα1 in L6 myotubes using siRNA reduced AMPKα protein content and prevented upregulation of PGC-1α mRNA by DETA-NO. Meanwhile, siRNA knockdown of AMPKα2 had no effect on total AMPKα protein content or PGC-1α mRNA. These results suggest that NO effects on PGC-1α expression are mediated by AMPKα1. Paradoxically, we found that the AMPK-activating compound, AICAR, induced NO release from L6 myotubes, and that AICAR-induced upregulation of PGC-1α mRNA wa...Continue Reading

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