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- W2149762519 abstract "Although the effects of mechanical stimuli have been studied extensively in fully differentiated skeletal muscle and have been shown to promote changes in phenotype, including altered myosin heavy chain isoform expression, the effects of a change in mechanical environment have been poorly studied at earlier stages of skeletal muscle differentiation. In particular, the early events elicited by mechanical stimuli upon differentiating myocytes have not been investigated. In the present study, the effect of static stretch on the activation of transcriptional factors MEF2A and NFATc1, which have been shown to be involved in the differentiation and phenotype regulation of skeletal muscle, have been examined. Furthermore, putative second messenger signaling pathways that could be involved in the dephosphorylation and hence activation of these factors were also examined. We have demonstrated that static stretch application produces a robust increase in p38 phosphorylation preceding MEF2A, but not NFATc1, nuclear translocation as well as deactivation of GSK-3β via its phosphorylation. Using SB-203580 and cyclosporine A drugs to inhibit both p38- or/and calcineurin-dependent signals, respectively, we have shown that MEF2A phosphorylation and subsequent nuclear translocation are regulated by p38 and calcineurin in a biphasic, time-dependent manner. Moreover, we also present evidence for another kinase that is involved in the stretch-related signal triggering MEF2A hyperphosphorylation, impairing its nuclear translocation, and that is related to p38. Finally, we have shown that static stretch application overnight promotes neonatal myosin heavy chain expression, which is inhibited by an inactivation of both p38 and calcineurin." @default.
- W2149762519 created "2016-06-24" @default.
- W2149762519 creator A5083255616 @default.
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- W2149762519 date "2005-03-01" @default.
- W2149762519 modified "2023-10-10" @default.
- W2149762519 title "Static stretch promotes MEF2A nuclear translocation and expression of neonatal myosin heavy chain in C<sub>2</sub>C<sub>12</sub>myocytes in a calcineurin- and p38-dependent manner" @default.
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- W2149762519 doi "https://doi.org/10.1152/ajpcell.00346.2004" @default.
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