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- W2067029219 abstract "Background/Aims: ATP-sensitive K+ (KATP) channels play an important role in the regulation of smooth muscle membrane potential. This study was designed to investigate the effects of pinacidil and cromakalim, KATPsensitive channel activators, on sheep sphincters of Oddi (SO). Methods: SO rings were mounted in a tissue bath and tested for changes in isometric tension in response to pinacidil (10-9 -10-4M) and cromakalim (10-9 -10-4 M) in the presence or absence of glibenclamide (10-6 M), a blocker of KATP channels. Furthermore, concentrationdependent contraction responses of carbachol were obtained. Results: Carbachol (10-9 -10-5 M) induced concentration-dependent contraction responses in the SO rings. Pinacidil (10-9 -10-4 M) and cromakalim (10-9 -10-4 M) induced concentration-dependent relaxation in isolated SO rings precontracted with carbachol (10-6 M). At their maximum effects, both pinacidil and cromakalim produced nearly full relaxation. In the presence of glibenclamide, concentration-relaxation curves for pinacidil and cromakalim underwent rightward parallel shifts. There were no significant differences between p EC50 and Emax values of pinacidil and cromakalim in the absence of glibenclamide (10-6M) (p > 0.05), but p EC50 values of pinacidil and cromakalim in the presence of glibenclamide (10-6 M) were significantly reduced (p < 0.05). Conclusion: These results suggest that the relaxation caused in sheep SO by pinacidil and cromakalim is mediated through the same glibenclamide-sensitive KATP channel. Pinacidil and cromakalim have an equipotent relaxing effect in isolated sheep SO and they can be beneficial as alternative drugs for obtaining selective relaxation during SO manometry after controlled clinical studies." @default.
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- W2067029219 date "2006-08-01" @default.
- W2067029219 modified "2023-10-03" @default.
- W2067029219 title "Investigation of the Relaxant Effects of Pinacidil and Cromakalim on the Sheep Sphincter of Oddi" @default.
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- W2067029219 doi "https://doi.org/10.1159/000092690" @default.
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