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- W2079626247 abstract "The modulation of tetrodotoxin-sensitive (TTX-S) and slow tetrodotoxin-resistant (TTX-R) sodium currents in rat dorsal root ganglion neurons by ATP was studied using the whole-cell patch-clamp method. The effects of ATP on two types of sodium currents were either stimulatory or inhibitory depending on the kinetic parameters tested. At a holding potential of -80 mV ATP suppressed TTX-S sodium currents when the depolarizing potential was positive to -30 mV but it increased them when the depolarizing potential was negative to -30 mV. At the same holding potential slow TTX-R sodium currents were always increased by ATP regardless of the depolarizing potential. In both types of sodium currents ATP shifted both the conductance-voltage relationship curve and the steady-state inactivation curve in the hyperpolarizing direction, and accelerated the time-dependent inactivation. ATP decreased the maximum conductance of TTX-S sodium currents but increased that of slow TTX-R sodium currents. The results suggest that ATP would decrease the excitability of neurons with TTX-S sodium channels but would increase that of neurons with slow TTX-R sodium channels. The effects of ATP on sodium currents were preserved in the presence of a G-protein inhibitor, GDP-beta-S, or purinergic antagonists, suramin and Reactive Blue-2, suggesting that purinergic receptors might not be involved in ATP modulation of sodium currents." @default.
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- W2079626247 date "2003-04-01" @default.
- W2079626247 modified "2023-09-23" @default.
- W2079626247 title "ATP modulation of sodium currents in rat dorsal root ganglion neurons" @default.
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- W2079626247 doi "https://doi.org/10.1016/s0006-8993(02)04218-x" @default.
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