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- W2089375322 abstract "The actions of lignocaine and benzocaine on transient and late Na(+) current generated by large diameter (> or =50 microm) adult rat dorsal root ganglion neurones, were studied using patch-clamp techniques. Both drugs blocked whole-cell late Na(+) current in a concentration-dependent manner. At 200 ms following the onset of a clamp step from -110 to -40 mV, the apparent K for block of late Na(+) current by lignocaine was 57.8+/-15 microM (mean+/-s.e.mean, n = 4). The value for benzocaine was 24.9+/-3.3 microM, (mean+/-s.e. mean, n = 3). The effect of lignocaine on transient current, in randomly selected neurones, appeared variable (n = 8, half-block from approximately 50 to 400 microM). Half-block by benzocaine was not attained, but both whole-cell (n = 11) and patch data suggested a high apparent K,>250 microM. Transient current always remained after late current was blocked. The voltage-dependence of residual late current steady-state inactivation was not shifted by 20 microM benzocaine (n = 3), whereas 200 microM benzocaine shifted the voltage-dependence of transient current steady-state inactivation by -18.7+/-5.9 mV (mean+/-s.e.mean, n = 4). In current-clamp, benzocaine (250 microM) could block subthreshold, voltage-dependent inward current, increasing the threshold for eliciting action potentials, without preventing their generation (n = 2). Block of late Na(+) current by systemic local anaesthetic may play a part in preventing ectopic impulse generation in sensory neurones." @default.
- W2089375322 created "2016-06-24" @default.
- W2089375322 creator A5068102799 @default.
- W2089375322 date "2000-04-01" @default.
- W2089375322 modified "2023-09-24" @default.
- W2089375322 title "Selective block of late Na+ current by local anaesthetics in rat large sensory neurones" @default.
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- W2089375322 doi "https://doi.org/10.1038/sj.bjp.0703261" @default.
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