Sarcolemmal K(ATP) channels: what do we really know?
K(ATP) channels are present at an extremely high density in the heart, and we know from in vitro studies that channel activation causes dramatic action potential shortening and contractile failure. But, if and when this happens in vivo is still a matter of debate. Twenty one years of intense study have led to a well-developed understanding of the molecular basis of K(ATP) channel activity. Structure-function studies, together with cellular experiments probing regulatory molecules have told us much about the way the K(ATP) channel can activate, and gene-targeting and proteomic tools have further elucidated determinants of in vivo function. However, the true physiological determinants of sarcolemmal K(ATP) activity remain elusive, we still await full illumination of the role of the channel in the intact heart.
Flagg
Thomas P
TP
Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, MO 63110, USA.
Nichols
Colin G
CG
D018528:ATP-Binding Cassette Transporters / Q000235:genetics / Q000378:metabolism; D000255:Adenosine Triphosphate / Q000378:metabolism*; D000818:Animals; D006329:Heart Conduction System / Q000378:metabolism; D006801:Humans; D007511:Ischemia / Q000378:metabolism / Q000503:physiopathology; D019194:Ischemic Preconditioning; D054086:KATP Channels; D009154:Mutation; D009206:Myocardium / Q000378:metabolism; D015221:Potassium Channels / Q000235:genetics / Q000378:metabolism*; D024661:Potassium Channels, Inwardly Rectifying / Q000235:genetics / Q000378:metabolism; D011955:Receptors, Drug / Q000378:metabolism; D012508:Sarcolemma / Q000378:metabolism*; D064233:Sulfonylurea Receptors; D000099161:Kcnj11 Channel
D018528:ATP-Binding Cassette Transporters; D000255:Adenosine Triphosphate; D054086:KATP Channels; D015221:Potassium Channels; D024661:Potassium Channels, Inwardly Rectifying; D011955:Receptors, Drug; D064233:Sulfonylurea Receptors; D000099161:Kcnj11 Channel; C092520:uK-ATP-1 potassium channel