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- W2024888417 abstract "Effects of ER-001533 (ER), a newly synthesized vasorelaxant, on the membrane currents were examined in single ventricular cells of guinea pigs. The patch-clamp technique was used in the whole-cell and inside-out patch configurations. In the whole-cell clamp condition, ER induced a time-independent K(+)-dominant current, which was inhibited by glibenclamide (1-3 microM), suggesting that ER activated the cardiac ATP-sensitive K+ channel (KATP). To elucidate the mechanism of ER-mediated KATP channel activation, the drug was applied to the inside-out patches before and after channel run-down. Since nucleotide diphosphates could induce the channel openings after complete run-down, effects of the drug on the nucleotide diphosphate-induced channel openings were also examined. Before run-down, ER activated the KATP channel only in the presence of ATP. ER shifted the relation between [ATP]i and the channel activity to the right in a concentration-dependent fashion without a significant alteration of the slope. After channel run-down, ER did not affect the channel openings either in the absence or in the presence of UDP. However, ER could relieve the ATP-gamma-S inhibition of the UDP-induced channel openings. Thus, we conclude that ER antagonizes the inhibitory effect of ATP on the KATP channel in a competitive manner, thereby enhancing the channel openings." @default.
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- W2024888417 title "Activation of the cardiac ATP-sensitive K+ channel by ER-001533, a newly synthesized vasorelaxant." @default.
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- W2024888417 doi "https://doi.org/10.1161/01.res.70.5.1054" @default.
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