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• W2116768897 abstract "Prolonged action potential duration (APD) and decreased transient outward K+ current (I(to)) as a result of decreased expression of K(v4.2) and K(v4.3) genes are commonly observed in heart disease. We found that treatment of cultured neonatal rat ventricular myocytes with Heteropoda Toxin3, a blocker of cardiac I(to), induced hypertrophy as measured using cell membrane capacitance and (3)H-leucine uptake. To dissect the role of specific I(to)-encoding genes in hypertrophy, I(to) was selectively reduced by overexpressing mutant dominant-negative (DN) transgenes. I(to) amplitude was reduced equally (by about 50%) by overexpression of DN K(v1.4) (K(v1.4)N) or DN K(v4.2) (either K(v4.2)N or K(v4.2)W362F), but only DN K(v4.2) prolonged APD duration (at 1 Hz) and induced myocyte hypertrophy. This hypertrophy was prevented by coexpressing wild-type K(v4.2) channels (K(v4.2)F) with the DN K(v4.2) genes, suggesting the hypertrophy is due to I(to) reduction and not nonspecific effects of transgene overexpression. The hypertrophy caused by reductions of K(v4.x)-based I(to) was associated with increased activity of the calcium-dependent phosphatase, calcineurin, and could be prevented by coinfection with Ad-CAIN, a specific calcineurin inhibitor. The hypertrophy and calcineurin activation induced by K(v4.2)N infection were prevented by blocking Ca2+ entry and excitability with verapamil or high [K+]o. Our studies suggest that reductions of K(v4.2/3)-based I(to) play a role in hypertrophy signaling by activation of calcineurin." @default.
• W2116768897 created "2016-06-24" @default.
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• W2116768897 date "2002-03-22" @default.
• W2116768897 modified "2023-10-12" @default.
• W2116768897 title "Reduction of <i>I</i> _to Causes Hypertrophy in Neonatal Rat Ventricular Myocytes" @default.
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• W2116768897 doi "https://doi.org/10.1161/01.res.0000012223.86441.a1" @default.
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