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- W3147728360 abstract "Class III antiarrhythmic drugs show promise as effective treatments for the suppression of potentially lethal cardiac arrhythmias. Dofetilide (UK-68,798), is a potent class III antiarrhythmic agent that is presently under clinical investigation. The objective of this study was to determine whether [3H]dofetilide could be used as a specific radioligand for the rapidly activating delayed rectifier K+ channel of the heart. We find that [3H]dofetilide binds to high-affinity sites on guinea pig cardiac myocytes. Competition studies using unlabeled dofetilide indicate that binding is characterized by an IC50 of 100 +/- 30 nM (mean +/- SD, n = 13). Scatchard analyses of binding indicate a Kd of 70 +/- 6 nM and a maximal binding capacity of 0.30 +/- 0.02 pmol/mg protein. [3H]Dofetilide is displaced from guinea pig myocytes by dofetilide, clofilium, quinidine, sotalol, and sematilide with a rank order of potency that correlates with functional blockade of the rapidly activating delayed rectifier K+ current (correl..." @default.
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- W3147728360 date "1993-01-01" @default.
- W3147728360 modified "2023-09-28" @default.
- W3147728360 title "Identification of a specific radioligand for the cardiac rapidly activating delayed rectifier K+ channel." @default.
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