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Effect of rilmakalim on detrusor contraction in the presence and absence of urothelium

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Abstract

Openers of KATP channels are known to inhibit KCl-, carbachol- and also electrically induced contractions in detrusor muscle strips from various species. Contractions of isolated strips of urinary bladder are usually of higher amplitude when the urothelium has been removed. This has been explained by the release of an urothelium-derived relaxing factor. In this study we examined whether intact urothelium may modulate the effect of the selective KATP channel opener rilmakalim. Contractile responses to 85 mM KCl and 10 μM carbachol were measured in detrusor strips from mouse, pig and man. In the presence of an intact urothelium, contractions were significantly reduced in strips from all three species investigated. In preparations with urothelium rilmakalim reduced KCl contractions with similar potency and efficacy [−logIC50 (M) 4.6 to 5.1; Effmax reduction to 14-30% of control]. However, in urothelium-denuded strips rilmakalim was more potent in pig (−logIC50 5.5) than in mouse and man (−logIC50 4.7 and 4.4, respectively). The order of potency for rilmakalim to suppress carbachol-induced contractions was pig (—logIC50 6.7) > man (5.8) > mouse (4.7); contractions were significantly more reduced in pig (Effmax reduction to 11±2%, n=10) and in mouse (21±2%, n=8) than in human detrusor (55±5%, n=5). The presence of urothelium did not affect the concentration–response curves for rilmakalim, with the exception of KCl-induced contractions in pig. Only the rilmakalim-induced relaxation of carbachol-mediated contractions in pig were prevented by the KATP channel blocker glibenclamide. We conclude that with this one exception, the responses to rilmakalim in detrusor contractions were not mediated by KATP channel opening.

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Acknowledgements

The authors thank Prof. Dr. U. Quast, University of Tübingen, Germany for his stimulating discussion and helpful comments. We gratefully acknowledge the excellent technical assistance of Sabine Kirsch. M.W. and S.K. were financially supported by APOGEPHA Arzneimittel GmbH Dresden, Germany.

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Authors and Affiliations

  1. Institut für Pharmakologie und Toxikologie, Medizinische Fakultät, TU Dresden, Fetscherstrasse 74, 01307, Dresden, Germany

    Melinda Wuest, Susann Kaden & Ursula Ravens

  2. Klinik und Poliklinik für Urologie, Universitätsklinikum, TU Dresden, Fetscherstrasse 74, 01307, Dresden, Germany

    Oliver W. Hakenberg & Manfred P. Wirth

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  1. Melinda Wuest
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  2. Susann Kaden
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Correspondence to Melinda Wuest.

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Wuest, M., Kaden, S., Hakenberg, O.W. et al. Effect of rilmakalim on detrusor contraction in the presence and absence of urothelium. Naunyn Schmied Arch Pharmacol 372, 203–212 (2005). https://doi.org/10.1007/s00210-005-0015-4

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  • DOI: https://doi.org/10.1007/s00210-005-0015-4

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