Journal
HEART RHYTHM
Volume 7, Issue 9, Pages 1309-1315Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.hrthm.2010.02.017
Keywords
Atrial fibrillation; Cardiovascular disease; Cardioversion; Ion channel; Kv1.5; Trafficking
Categories
Funding
- National Institutes of Health [HL0270973, T32 GM008322]
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Atrial fibrillation (AF) is a common cardiac arrhythmia with potentially life-threatening complications. Drug therapies for treatment of AF that seek long-term maintenance of normal sinus rhythm remain elusive due in large part to proarrhythmic ventricular actions. Kv1.5, which underlies the atrial specific I-Kur current, is a major focus of research efforts seeking new therapeutic strategies and targets. Recent work has shown a novel effect of antiarrhythmic drugs where compounds that block Kv1.5 channel current also can alter ion channel trafficking. This work further suggests that the pleiotropic effects of antiarrhythmic drugs may be separable. Although this finding highlights the therapeutic potential for selective manipulation of ion channel surface density, it also reveals an uncertainty regarding the specificity of modulating trafficking pathways without risk of off-target effects. Future studies may show that specific alteration of Kv1.5 trafficking can overcome the proarrhythmic limitations of current pharmacotherapy and provide an effective method for long-term cardioversion in AF.
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