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. 1990 Feb;87(4):1391–1395. doi: 10.1073/pnas.87.4.1391

Induction of acetylcholine receptor alpha-subunit gene expression in chicken myotubes by blocking electrical activity requires ongoing protein synthesis.

A Duclert 1, J Piette 1, J P Changeux 1
PMCID: PMC53481  PMID: 2304905

Abstract

The level of acetylcholine receptor alpha-subunit mRNA in primary cultures of chicken myotubes increases when the spontaneous electrical activity of the myotube is suppressed by the sodium channel blocker tetrodotoxin. This increase was prevented by two translational inhibitors: cycloheximide and anisomycin. Neither the basal level of alpha-subunit mRNA nor that of muscle-specific creatine phosphokinase mRNA was affected by these inhibitors. In contrast, cycloheximide potentiated the limited increase of alpha-subunit mRNA levels evoked by the neuropeptide calcitonin gene-related peptide. The high level of alpha-subunit mRNA elicited by tetrodotoxin treatment did not persist after subsequent addition of cycloheximide in the presence of tetrodotoxin, indicating that the continuous synthesis of protein factor(s) is necessary for this regulation. Moreover, cycloheximide decreased the high level of alpha-subunit mRNA present at early stages of in vitro maturation of muscle primary cultures without blocking the further increase of the muscle-specific creatine phosphokinase mRNA. Implications of the requirement for constant synthesis of protein factors on the induction of muscle-specific gene expression by blocking myotube electrical activity are discussed.

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Selected References

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