NS-1643 is a Human ether-a-go-go related gene (hERG) KV11.1 channel activator (EC50 = 10.5 M). NS1643 increased both steady-state and tail current at all voltages tested. The EC(50) value for HERG channel activation was 10.5 microM. HERG channel activation by small molecules such as NS1643 increases the repolarization reserve and presents an interesting new antiarrhythmic approach.
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