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Styrax blocks inward and outward current of Kir2.1 channel.
Channels 2017 January 3
Kir2.1 plays key roles in setting rest membrane potential and modulation of cell excitability. Mutations of Kir2.1, such as D172N or E299V, inducing gain-of-function, can cause type3 short QT syndrome (SQT3) due to the enlarged outward currents. So far, there is no clinical drug target to block the currents of Kir2.1. Here, we identified a novel blocker of Kir2.1, styrax, which is a kind of natural compound selected from traditional Chinese medicine. Our data show that styrax can abolish the inward and outward currents of Kir2.1. The IC50 of styrax for WT, D172N and E299V are 0.0113 ± 0.00075, 0.0204 ± 0.0048 and 0.0122 ± 0.0012 (in volume), respectively. The results indicate that styrax can serve as a novel blocker for Kir2.1.
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