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Mechanism of staurosporine-induced decrease in acetylcholine receptor recovery from desensitization

J C Hardwick1, R L Parsons

  • 1Department of Anatomy and Neurobiology, University of Vermont, Burlington 05405.

British Journal of Pharmacology
|March 1, 1993
PubMed
Summary
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Staurosporine pretreatment inhibits nicotinic acetylcholine (ACh) receptor recovery from desensitization by altering channel conductance. This leads to a decrease in miniature endplate current (m.e.p.c.) amplitude, suggesting a mix of small and large conductance channels are activated.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Pharmacology

Background:

  • Nicotinic acetylcholine (ACh) receptors mediate fast synaptic transmission.
  • Receptor desensitization is a crucial regulatory mechanism.
  • Protein kinase inhibitors can modulate receptor function.

Purpose of the Study:

  • To elucidate the mechanism by which staurosporine inhibits ACh receptor recovery from carbachol-induced desensitization.
  • To investigate the impact of staurosporine on ACh receptor channel properties.

Main Methods:

  • Voltage-clamped snake twitch muscle fibers were used.
  • Miniature endplate currents (m.e.p.c.s) were recorded.
  • Noise analysis and single-channel recording were performed.
  • Staurosporine and carbachol were applied to induce and inhibit desensitization.

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Main Results:

  • Staurosporine pretreatment significantly reduced the recovery of m.e.p.c. amplitudes after carbachol exposure.
  • The inhibitory effect of staurosporine was dependent on the duration of carbachol exposure and was long-lasting.
  • Noise analysis revealed a decrease in mean channel conductance in staurosporine-treated preparations after recovery.
  • Single-channel recordings identified a population of small conductance (23 pS) channels in staurosporine-treated endplates post-recovery, which were not present in controls.

Conclusions:

  • Staurosporine inhibits ACh receptor recovery from desensitization by promoting the activation of a mixture of small and large conductance channels.
  • This alteration in channel populations underlies the observed decrease in m.e.p.c. amplitude.
  • The findings suggest a role for protein kinases in regulating ACh receptor channel gating during desensitization and recovery.