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- W2078280030 abstract "Effects of extracellular anions were studied in electrophysiological experiments on freshly isolated rat ventricular myocytes. Under current-clamp, action potential duration (APD) was prolonged by reducing the extracellular Cl(-) concentration and shortened by replacement of extracellular Cl(-) with I(-). Under voltage-clamp, membrane potential steps or ramps evoked an anionic background current (I(AB)) carried by either Cl(-), Br(-), I(-) or NO(3)(-). Activation of I(AB) was Ca(2+)- and cyclic AMP-independent, and was unaffected by cell shrinkage. I(AB) was insensitive to stilbene and fenamate anion transport blockers at concentrations that inhibit Ca(2+)-, cyclic AMP- and swelling-activated Cl(-) currents in ventricular cells of other mammals. These results suggest that I(AB) may be carried by a novel class of Cl(-) channel. Correlation of anion substitution experiments on membrane current and action potentials revealed that I(AB) could play a major role in controlling rat ventricular APD. These findings have important implications for those studying cardiac Cl(-) channels as potential targets for novel antiarrythmic agents." @default.
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- W2078280030 date "2000-01-01" @default.
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- W2078280030 title "A novel anionic conductance affects action potential duration in isolated rat ventricular myocytes" @default.
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- W2078280030 doi "https://doi.org/10.1038/sj.bjp.0703074" @default.
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