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NS 19504 is an activator of large-conductance calcium-activated potassium channels (KCa1.1/BK).1 It induces currents in whole-cell patch-clamp assays using HEK293 cells expressing human KCa1.1/BK when used at a concentration of 10 µM. NS 19504 decreases the force of spontaneous phasic contractions in isolated and perfused guinea pig bladder smooth muscle strips (EC50 = 640 nM). It inhibits methoxamine-induced contractions in isolated rat saphenous arteries when used at a concentration of 6 µM.2
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1. NS19504: A novel BK channel activator with relaxing effect on bladder smooth muscle spontaneous phasic contractions. J. Pharmacol. Exp. Ther. 350(3), 520-530 (2014).
2. The functional availability of arterial Kv7 channels is suppressed considerably by large-