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Related Experiment Videos

Alpha-adrenoceptor blocking properties of vesamicol.

G Wannan1, C Prior, I G Marshall

  • 1Department of Physiology and Pharmacology, University of Strathclyde, Glasgow, Scotland, U.K.

European Journal of Pharmacology
|August 16, 1991
PubMed
Summary

Vesamicol, an acetylcholine storage inhibitor, acts as a non-selective alpha-adrenoceptor antagonist. Its phenylpiperidino moiety likely contributes to this alpha-adrenoceptor blocking activity, affecting smooth muscle responses.

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Area of Science:

  • Pharmacology
  • Neuroscience
  • Physiology

Background:

  • Vesamicol is known as an inhibitor of acetylcholine storage.
  • Alpha-adrenoceptors play a crucial role in regulating smooth muscle contraction, including in the vas deferens.

Purpose of the Study:

  • To investigate the effects of vesamicol on alpha 1- and alpha 2-adrenoceptors.
  • To determine the specific adrenoceptor antagonist properties of vesamicol isomers.

Main Methods:

  • Experiments were conducted on isolated rat vas deferens.
  • Alpha 1-adrenoceptor antagonism was assessed by measuring the reduction in noradrenaline-induced contractions.
  • Alpha 2-adrenoceptor antagonism was evaluated by blocking the inhibitory effects of clonidine on electrically evoked twitches.

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Main Results:

  • (-)-Vesamicol exhibited non-selective antagonism of both alpha 1- and alpha 2-adrenoceptors in the presence of uptake blockers.
  • (+)-Vesamicol showed equipotent activity in blocking alpha 2-adrenoceptors compared to the (-)-isomer.
  • (-)-Vesamicol also augmented the maximum response to noradrenaline, though the mechanism remains unclear.

Conclusions:

  • Vesamicol possesses alpha-adrenoceptor antagonist properties, affecting both alpha 1 and alpha 2 subtypes.
  • The phenylpiperidino part of the vesamicol molecule is suggested to be responsible for its alpha-adrenoceptor blocking activity.
  • The study highlights potential off-target effects of vesamicol beyond its known action on acetylcholine storage.