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• W2120804597 abstract "Inhibition of cardiac late sodium current (late I_Na) is a strategy to suppress arrhythmias and sodium-dependent calcium overload associated with myocardial ischemia and heart failure. Current inhibitors of late I_Na are unselective and can be proarrhythmic. This study introduces GS967 (6-[4-(trifluoromethoxy)phenyl]-3-(trifluoromethyl)-[1,2,4]triazolo[4,3-a]pyridine), a potent and selective inhibitor of late I_Na, and demonstrates its effectiveness to suppress ventricular arrhythmias. The effects of GS967 on rabbit ventricular myocyte ion channel currents and action potentials were determined. Anti-arrhythmic actions of GS967 were characterized in ex vivo and in vivo rabbit models of reduced repolarization reserve and ischemia. GS967 inhibited <i>Anemonia sulcata</i> toxin II (ATX-II)–induced late I_Na in ventricular myocytes and isolated hearts with IC₅₀ values of 0.13 and 0.21 <i>µ</i>M, respectively. Reduction of peak I_Na by GS967 was minimal at a holding potential of −120 mV but increased at −80 mV. GS967 did not prolong action potential duration or the QRS interval. GS967 prevented and reversed proarrhythmic effects (afterdepolarizations and torsades de pointes) of the late I_Na enhancer ATX-II and the I_Kr inhibitor E-4031 in isolated ventricular myocytes and hearts. GS967 significantly attenuated the proarrhythmic effects of methoxamine+clofilium and suppressed ischemia-induced arrhythmias. GS967 was more potent and effective to reduce late I_Na and arrhythmias than either flecainide or ranolazine. Results of all studies and assays of binding and activity of GS967 at numerous receptors, transporters, and enzymes indicated that GS967 selectively inhibited late I_Na. In summary, GS967 selectively suppressed late I_Na and prevented and/or reduced the incidence of experimentally induced arrhythmias in rabbit myocytes and hearts." @default.
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• W2120804597 date "2012-09-25" @default.
• W2120804597 modified "2023-10-03" @default.
• W2120804597 title "A Novel, Potent, and Selective Inhibitor of Cardiac Late Sodium Current Suppresses Experimental Arrhythmias" @default.
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• W2120804597 doi "https://doi.org/10.1124/jpet.112.198887" @default.
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