Effects of mebudipine and dibudipine, two new calcium channel blockers, on guinea-pig isolated common bile duct

Beigly, S. and Ghiaee, S. and Ebrahimi, S.A. and Mahmoudian, M. (2004) Effects of mebudipine and dibudipine, two new calcium channel blockers, on guinea-pig isolated common bile duct. Acta Physiologica Hungarica, 91 (2). pp. 111-118. ISSN 0231-424X

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Abstract

The inhibitory effects of calcium channel blockers; nifedipine and two new compounds, mebudipine and dibudipine, on contractions of isolated guinea-pig common bile duct were investigated. All the compounds tested induced a concentration-dependent reduction of the amplitude of contractile response to electrical stimulation and all the compounds displaced concentration-response curve of calcium chloride to the right in a concentration-dependent manner. The pIC50 values for these compounds acting on electrically stimulated common bile duct were calculated as: dipudipine: 8.50±0.17; mebudipine: 8.27±0.20; nifedipine: 7.96±0.07. The compounds also antagonized the contractile response of K+-depolarized guinea-pig common bile duct to cumulative concentration of calcium. However the inhibitory effect of these compounds were not significantly different.

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