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) and accessory (
, minK, MiRP) subunits have been cloned from or shown to be expressed in heart, and a variety of experimental approaches are being exploited in vitro and in vivo to define the relationship(s) between these subunits and functional voltage-gated cardiac K+ channels. Considerable progress has been made in defining these relationships recently, and it is now clear that distinct molecular entities underlie the various electrophysiologically distinct repolarizing K+ currents (i.e. Ito,f, Ito,s, IKr, IKs, IKur, IK,slow, etc.) in myocyardial cells.
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A. Krumerman, X. Gao, J.-S. Bian, Y. F. Melman, A. Kagan, and T. V. McDonald An LQT mutant minK alters KvLQT1 trafficking Am J Physiol Cell Physiol, June 1, 2004; 286(6): C1453 - C1463. [Abstract] [Full Text] [PDF]
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H. Sun, G. Y. Oudit, R. J. Ramirez, D. Costantini, and P. H. Backx The phosphoinositide 3-kinase inhibitor LY294002 enhances cardiac myocyte contractility via a direct inhibition of Ik,slow currents Cardiovasc Res, June 1, 2004; 62(3): 509 - 520. [Abstract] [Full Text] [PDF]
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C. F. Rossow, E. Minami, E. G. Chase, C. E. Murry, and L.F. Santana NFATc3-Induced Reductions in Voltage-Gated K+ Currents After Myocardial Infarction Circ. Res., May 28, 2004; 94(10): 1340 - 1350. [Abstract] [Full Text] [PDF]
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B. Rosati and D. McKinnon Regulation of Ion Channel Expression Circ. Res., April 16, 2004; 94(7): 874 - 883. [Abstract] [Full Text] [PDF]
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