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Activation of p38 in C2C12 myotubes following ATP depletion depends on extracellular glucose

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Abstract

Muscle cells adjust their glucose metabolism in response to myriad stimuli, and particular attention has been paid to glucose metabolism after contraction, ATP depletion, and insulin stimulation. Each of these requires translocation of GLUT4 to the cell membrane, and may require activation of glucose transporters by p38. In contrast, AICAR stimulates glucose transport without activation of p38, suggesting that p38 activation may be an indirect consequence of accelerated glucose transport or metabolism. This study was designed to investigate the contribution of AMPK and p38 to ATP homeostasis and glucose metabolism to test the hypothesis that p38 reflects glycolytic activity rather than controls glucose uptake. Treating mature myotubes with rotenone caused transient ATP depletion in 15 min with recovery by 120 min, associated with increased lactate production. Both ACC and p38 were rapidly phosphorylated, but ACC remained phosphorylated while p38 phosphorylation declined as ATP recovered. AMPK inhibition blocked ATP recovery, lactate production, and phosphorylation of p38 and ACC. Inhibition of p38 had little effect. AICAR induced ACC phosphorylation, but not lactate production or p38 phosphorylation. Finally, removing extracellular glucose potentiated rotenone-induced AMPK activation, but reduced lactate generation, ATP recovery and p38 activation. Thus, glucose metabolism is highly sensitive to ATP homeostasis via AMPK activity, but p38 activity is dispensable. Although p38 is strongly phosphorylated during ATP depletion, this appears to be an indirect consequence of accelerated glycolysis.

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  1. School of Applied Physiology, Georgia Institute of Technology, Atlanta, GA, 30332, USA

    Chia George Hsu & Thomas J. Burkholder

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  1. Chia George Hsu
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Correspondence to Thomas J. Burkholder.

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Hsu, C.G., Burkholder, T.J. Activation of p38 in C2C12 myotubes following ATP depletion depends on extracellular glucose. J Physiol Biochem 71, 253–265 (2015). https://doi.org/10.1007/s13105-015-0406-z

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  • DOI: https://doi.org/10.1007/s13105-015-0406-z

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