Affiliation:
1. Departamento de Farmacología, Facultad de Farmacia, Universidad de Sevilla, Sevilla, España
Abstract
Abstract
Tetrazepam is a benzodiazepine derivative clinically used as a muscle relaxant. The aim of the present work was to examine its effect on uterine smooth muscle of the rat in estrus.
Tetrazepam required micromolar concentractions to relax contractile responses induced by KCl and acetylcholine in Ca2+ solution, but not oxytocin-induced contraction. In Ca2+-free solution, tetrazepam inhibited Ca2+-induced contractions in depolarized uterus and vanadate-induced contractions.
We suggest that tetrazepam relaxes contractile responses induced by activation of voltage-sensitive calcium channels and receptor-operated calcium channels with little selectivity or that it antagonizes the effect of calcium at subsequent steps, possibly intracellular stores sensitive to vanadate but not sensitive to oxytocin. The inhibition of contraction of rat uterus is not related to high-affinity peripheral benzodiazepine binding sites.
Publisher
Oxford University Press (OUP)
Subject
Pharmaceutical Science,Pharmacology
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