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Inward rectifier potassium currents are present in different types of cells. In the heart, the inward rectifierpotassium current IK1 plays a crucial role in maintaining cardiac resting membrane potential and excitability. It isgenerally believed that the strong inward rectification of cardiac IK1 channels makes it conduct substantial current near the resting potential but carry little or no current at depolarized potentials. However, recent studies in native cardiac myocytes and HEK 293 cell line stably expressing human Kir2.1 gene have demonstrated that a significant transient outward current carried by IK1 channels is activated by the upstroke of action potential. This review will revisit cardiac IK1 channels, especially the previously-ignored transient outward component of IK1 carried by Kir2.1 channels.published_or_final_versio

Revisit of the Cardiac Inward Rectifier Potassium Current IK1