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Subtype specific roles of mitogen activated protein kinases in L6E9 skeletal muscle cell differentiation

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Abstract

Role of mitogen activated protein kinases (MAPK) in skeletal muscle differentiation is not fully understood. We investigated subtype-specific functions and their interactions, if any, in the regulation of myogenic differentiation in L6E9 skeletal muscle cells. We show inhibition of extracellular signal-regulated kinase-1 and -2 (ERK-1/-2) and activation of p38 MAP kinase during the differentiation of L6E9 rat skeletal muscle cells under low serum condition. Inhibition of ERK-1/-2 activity dramatically enhanced differentiation as was evident from cellular morphology, expression of muscle differentiation specific marker proteins, suggesting that ERK-1/-2 activation may be inhibitory to initiation and progression of differentiation. In contrast, inhibition of p38 MAP kinase completely prevented differentiation; meaning p38 activation is required from the initiation till terminal differentiation of L6E9 cells. Moreover, inhibition of ERK-1/-2 activities enhanced the activation of p38 MAP kinase that resulted in enhancement of differentiation; whereas inhibition of p38 MAP kinase activity enhanced the ERK-1/-2 activities culminating in abrogation of differentiation. We conclude that ERK-1/-2 and p38 MAP kinase cascades oppositely regulate each other's function(s) thereby regulating L6E9 skeletal muscle differentiation.

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Khurana, A., Dey, C.S. Subtype specific roles of mitogen activated protein kinases in L6E9 skeletal muscle cell differentiation. Mol Cell Biochem 238, 27–39 (2002). https://doi.org/10.1023/A:1019957602038

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