Reviews |
From the Departments of Molecular Biology and Pharmacology (J.M.N.) and Cell Biology and Physiology (C.G.N.), Washington University Medical School, St Louis, Mo; the Division of Neuroscience (T.L.S.), Childrens Hospital and Harvard Medical School, Boston, Mass; and INSERM U533 (D.E.), Hôpital Hotel-Dieu, Nantes, France.
Correspondence to Denis Escande, Laboratoire de Physiopathologie et de Pharmacologie Cellulaires et Moléculaires, INSERM U533, 1 rue Gaston Veil, Faculté de Médecine, 44035 Nantes, France. E-mail denis.escande{at}nantes.inserm.fr
Abstract
In the mammalian myocardium, potassium (K+) channels control resting potentials, action potential waveforms, automaticity, and refractory periods and, in most cardiac cells, multiple types of K+ channels that subserve these functions are expressed. Molecular cloning has revealed the presence of a large number of K+ channel pore forming (
) and accessory (ß) subunits in the heart, and considerable progress has been made recently in defining the relationships between expressed K+ channel subunits and functional cardiac K+ channels. To date, more than 20 mouse models with altered K+ channel expression/functioning have been generated using dominant-negative transgenic and targeted gene deletion approaches. In several instances, the genetic manipulation of K+ channel subunit expression has revealed the role of specific K+ channel subunit subfamilies or individual K+ channel subunit genes in the generation of myocardial K+ channels. In other cases, however, the phenotypic consequences have been unexpected. This review summarizes what has been learned from the in situ genetic manipulation of cardiac K+ channel functioning in the mouse, discusses the limitations of the models developed to date, and explores the likely directions of future research.
Key Words: Ito IK IK1 mouse models cardiac remodeling
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