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- W43263413 abstract "Effects of the plant alkaloid Aconitine on the kinetics of sodium channels were studied in enzymatically isolated single cells of the mouse ventricular myocardium. Aconitine (1 mumol/l) induced a prolongation of the 90% repolarization of action potentials from 52.4 +/- 3.7 ms to 217.0 +/- 12.5 ms. Delayed terminal repolarization and oscillatory afterpotentials preceded spontaneous activity with high frequencies. Peak sodium currents were diminished from 28.0 +/- 9.0 to 14.0 +/- 6.0 nA. The reversal potential of the sodium current was shifted from 16.0 +/- 11.0 to -8.0 +/- 6.0 mV (52.5 mmol/l extracellular sodium concentration) suggesting a decreased selectivity of the Aconitine-modified Na channels. The m-affinity-curves were shifted 31 mV towards more negative potentials at a constant slope. The h affinity-curves were shifted in the same direction by 13 mV. The slope parameter of the h affinity-voltage relationship was enlarged from 9.1 +/- 2.2 mV to 15.6 +/- 4.4 mV. Shifts in m affinity and h affinity resulted in an increased window. The alkaloid modified channels inactivated extremely slowly at potentials negative to -40 mV, but showed a fast and complete inactivation at potentials positive to -40 mV." @default.
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- W43263413 date "1986-10-01" @default.
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- W43263413 title "Properties of aconitine-modified sodium channels in single cells of mouse ventricular myocardium." @default.
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