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• W2078830355 abstract "The effect of the convulsant drug pentylenetetrazole (PTZ) on separated membrane current components has been studied in identified voltage-clamped Aplysia neurones. External PTZ blocks the voltage-dependent Na+, Ca2+ currents and the delayed rectifier current (INa, ICa and IK,V, respectively). The amplitude of the Ca2+-activated K+ current (IK,Ca) is increased. The amplitude of the fast inactivating K+ current (IA) is transiently increased at low concentrations of PTZ but is depressed at higher concentrations or after long-lasting application of the drug. The effect of PTZ on leakage current (IL) seems to depend on the cell type. In some cells (R-15, L-7, LP-1) IL is decreased while it is increased in other cells (L-11, BL-1, BR-1). PTZ accelerates the inactivation of IK,V and IA and shifts the current-voltage relation of ICa to negative voltages by 5-8 mV. Pressure injection of PTZ into the neurone did not affect IK,V or IK,Ca. Thus PTZ seems to act on the outside of the plasma membrane. The effect of external PTZ on INa, ICa, IK,V and IL is also observed if the internal Ca2+ activity is buffered with EGTA suggesting that an increase in the internal Ca2+ activity is not involved. At -40 mV PTZ induces a tetrodotoxin-insensitive inward current carried by Na+ ions. PTZ transforms the beating pacemaker cell L-11 into a bursting pacemaker and the bursting pacemaker cell R-15 exhibits 'square-wave'-like oscillations of the membrane potential." @default.
• W2078830355 created "2016-06-24" @default.
• W2078830355 creator A5014163779 @default.
• W2078830355 creator A5072202046 @default.
• W2078830355 date "1987-09-01" @default.
• W2078830355 modified "2023-09-23" @default.
• W2078830355 title "Differential effects of pentylenetetrazole on ion currents of Aplysia neurones" @default.
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• W2078830355 doi "https://doi.org/10.1016/0006-8993(87)90568-3" @default.
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