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- W1988188767 abstract "Effects of MCI-154, a newly synthetized cardiotonic drug with vasodilator property, on the membrane potential and currents of the isolated papillary muscles and the single ventricular cells of the guinea pig were examined. MCI-154 (10−7-10−4 M) increased the developed tension in a dose-dependent manner without significant changes in the action potential configuration of the guinea pig papillary muscle. The slow response action potential obtained by increasing the extracellular K+ concentration to 24 mM was augmented by MCI-154 (10−6 and 10−4 M). This effect of MCI-154 was not blocked by atenolol (10−6 M). In voltage clamp experiments on single ventricular cells, the slow inward current was not affected, but the inward rectifier K+ current was reduced by higher concentration of MCI-154 (10−4 M). Considering the “run down” phenomenon of the slow inward current, the possibility that MCI-154 might have a slight increasing effect on the slow inward current could not be ruled out. From these results, it can be concluded that the positive inotropic action of MCI-154 can be explained partially by the decrease in the inward rectifier K+ current, and probably by the increase in the Ca2+ sensitivity of the contractile protein system." @default.
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- W1988188767 date "1987-01-01" @default.
- W1988188767 modified "2023-09-26" @default.
- W1988188767 title "Changes in membrane potentials and currents of ventricular cells of the guinea pig heart by a new cardiotonic drug, MCI-154." @default.
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- W1988188767 doi "https://doi.org/10.1254/jjp.44.481" @default.
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