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Small conductance Ca(2+)-activated K(+) channels (K(Ca)2 or SK channels) have been reported in excitable cells, where they aid in integrating changes in intracellular Ca(2+) (Ca(i)²⁺) with membrane potentials. We have recently reported the functional expression of SK channels in human and mouse cardiac myocytes. Additionally, we have found that the channel is highly expressed in atria compared with the ventricular myocytes. We demonstrated that human cardiac myocytes expressed all three members of SK channels (SK1, 2, and 3); moreover, the different members are capable of forming heteromultimers. Here, we directly tested the contribution of SK3 to the overall repolarization of atrial action potentials.

Critical roles of a small conductance Ca2+-activated K+ channel (SK3) in the repolarization process of atrial myocytes