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- W2036450392 abstract "The spasmolytic mechanisms of nicorandil, a novel antianginal drug, were investigated using 3,4-diaminopyridine (3,4-DAP)-induced phasic contractions of isolated canine coronary arteries in comparison with those of cromakalim and pinacidil. Nicorandil (10(-4) M), cromakalim (10(-6) M) and pinacidil (10(-5) M) suppressed the phasic contractions. Pretreatment with glibenclamide (10(-6) M), a specific blocking agent of ATP-sensitive K+ channel, eliminated the suppression of phasic contractions by these drugs; glibenclamide completely eliminated the suppression by cromakalim, while the eliminations against nicorandil and pinacidil were incomplete. The recoveries of peak tensions were only 56.8% and 76.1% for nicorandil and pinacidil, respectively. Nicorandil and pinacidil may suppress the phasic contractions via K+ channel opening and additional mechanisms. Methylene blue (10(-7)-10(-5) M) alone, a guanylate cyclase inhibitor, had no effect on the suppression of phasic contractions by nicorandil. In the presence of glibenclamide (10(-6) M), however, the pretreatment with methylene blue significantly augmented the recovery of peak tension for nicorandil. These results indicate that K+ channel openers may suppress the phasic contractions induced by 3,4-DAP via ATP-sensitive K+ channels, and that additionally, nicorandil may suppress the phasic contractility through guanylate cyclase stimulation, as a nitrate." @default.
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- W2036450392 date "1992-01-01" @default.
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- W2036450392 title "The vasospasmolytic effects of nicorandil, cromakalim and pinacidil on 3,4-diaminopyridine-induced phasic contractions in canine coronary arteries as an experimental vasospasm model." @default.
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- W2036450392 doi "https://doi.org/10.1254/fpj.100.317" @default.
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