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- W2968104010 abstract "The human ether-a-go-go-related gene (hERG) encodes the K+ channel that carries the rapid component of the delayed rectifier current in the human heart. Reduction of hERG activity induced by gene mutations or pharmacological inhibition is responsible for the type 2 form of long QT syndrome in patients which can develop into ventricular arrhythmia and sudden cardiac death. Therefore, pharmacological activation of hERG may lead to therapeutic potential for cardiac arrhythmias. In this study we characterized a small and novel compound, N-(2-(tert-butyl)phenyl)-6-(4-chlorophenyl)-4-(trifluoromethyl) nicotinamide, HW-0168, that exhibits potent activation of hERG channel with an EC50 of 0.41 ± 0.2 μM. Using whole-cell patch clamp recording of HEK293 cells stably expressed hERG channels, we found that HW-0168 dramatically increased current amplitude about 2.5 folds and slowed down current inactivation about 4 folds. HW-0168 shifted the voltage-dependent channel activation to hyperpolarizing direction about 3.7 mV and the voltage-dependent channel inactivation to depolarizing direction about 9.4 mV. In addition, recording of guinea-pig ventricular cells confirmed that HW-0168 shortened the action potential duration. In conclusion, we identified a novel hERG channel activator HW-0168 that can be used for studying the physiological role of hERG in cardiac myocytes and may be beneficial for treating long QT syndrome." @default.
- W2968104010 created "2019-08-22" @default.
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- W2968104010 date "2019-07-01" @default.
- W2968104010 modified "2023-09-26" @default.
- W2968104010 title "Electrophysiological characterization of a small molecule activator on human ether-a-go-go-related gene (hERG) potassium channel" @default.
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- W2968104010 doi "https://doi.org/10.1016/j.jphs.2019.08.001" @default.
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