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The Gq-coupled agonists phenylephrine and endothelin-1 each activate protein synthesis in cardiomyocytes as part of the programme that leads to cardiac hypertrophy. Here we show that they each induce the dephosphorylation of elongation factor (eEF) 2, a protein that in its dephosphorylated state mediates the translocation step of elongation. The ability of both agonists to induce dephosphorylation...
The β-adrenergic agonist isoproterenol increased the phosphorylation of elongation factor eEF2 in ventricular cardiomyocytes from adult rats (ARVC). Phosphorylation of eEF2 inhibits its activity, and protein synthesis was inhibited in ARVC concomitantly with increased eEF2 phosphorylation. eEF2 kinase activity in ARVC extracts was completely dependent upon Ca 2+ /calmodulin. In contrast...
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