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β-Arrestin2 regulates the rapid component of delayed rectifier K+ currents and cardiac action potential of guinea pig cardiomyocytes after adrenergic stimulation.
This study investigated the role of β-arrestin2 in the regulation of cardiac hERG/IKr potassium channel and AP during chronic adrenergic stimulation. Single left ventricular myocytes were isolated from guinea pig heart, and were transfected with adenovirus encoding β-arrestin2, or β-arrestin2 siRNA or an empty adenovirus. Cell cultures containing 10 nM isoproterenol, 1 nM phenylephrine or vehicle alone (control medium) were electro-physiologically examined after 48 h of incubation. Action potential duration at 50 and 90 % of repolarization (APD50 and APD90) were measured using whole-cell patch-clamp recording. Sustained...
Source: Cellular and Molecular Biology - December 29, 2019 Category: Molecular Biology Tags: Cell Mol Biol (Noisy-le-grand) Source Type: research