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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Agents that activate protein kinase C reduce acetylcholine sensitivity in cultured myotubes.
Journal of Cell Biology 1985 April
We have examined acetylcholine (ACh)-elicited potentials or currents in current- or voltage-clamped cultured myotubes exposed to 12-O-tetradecanoyl-phorbol-13-acetate (TPA), a potent tumor promoter that activates protein kinase C. Although this agent had little action on either membrane resting potential or electrical resistance, a reversible decrease in ACh sensitivity was induced on 3-4-d-old chick myotubes. Depression of transmitter action by TPA was extended to 7-8-d mouse myotubes only when they were treated with phosphatidylserine. Glyceryl dioleate had effects on myotubes similar to those of TPA but with a reduced efficacy. We conclude that the activation of protein kinase C might be involved with the capacity of ACh receptors to respond to transmitter stimulation.
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