Summary
In muscle strips isolated from guinea-pig and rat urinary bladder, propiverine (3–10 μM) inhibited carbachol-induced contractions in the presence of verapamil and Ca2+-induced contractions in excess K+ medium containing atropine, suggesting it has both anticholinergic and Ca2+ channel blocking actions.
The Ca2+ channel blocking action was also demonstrated by recording inward Ca 2+ currents in single cells dispersed from both species. The inhibition of inward currents by propiverine was three times stronger in the rat than the guinea-pig, ID50 being 7 μM for rat and 21 μM for guinea-pig. The recovery of the current after washout was faster than that of mechanical inhibition. It is concluded that propiverine blocks not only muscarinic receptors, but also Ca2+ channels at similar concentrations.
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Correspondence to: T. Tomita at the above address
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Tokuno, H., Chowdhury, J.U. & Tomita, T. Inhibitory effects of propiverine on rat and guinea-pig urinary bladder muscle. Naunyn-Schmiedeberg's Arch Pharmacol 348, 659–662 (1993). https://doi.org/10.1007/BF00167244
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DOI: https://doi.org/10.1007/BF00167244