Summary
The influence of local and general anaesthetics on cation influx through the fast, voltage-dependent sodium channel and the 5-HT3 receptor cation channel was studied in N1E-115 mouse neuroblastoma cells by measuring 2-min influx of the organic cation 14C-guanidinium induced by either veratridine (1 mmol/l) or 5-HT (100 μmol/l).
The veratridine-induced influx of 14C-guanidinium was potentiated by scorpion toxin and inhibited by tetrodotoxin. The 5-HT-induced 14C-guanidinium influx was not affected by tetrodotoxin but it was inhibited by nanomolar concentrations of the selective 5-HT3 receptor antagonists ondansetron and ICS 205–930; at high micromolar concentrations these compounds also inhibited the veratridine-induced influx of 14C-guanidinium. The 14C-guanidinium influx through both channels was inhibited by local and general anaesthetics. The rank order of potency for inhibition of veratridine-induced influx by local anaesthetics was tetracaine > bupivacaine > cocaine > lidocaine > procaine and that for inhibition of the 5-HT3 receptor channel was tetracaine > bupivacaine > cocaine > procaine > lidocaine. With the exception of procaine and cocaine, which were equipotent at both channels, the local anaesthetics were 4.4-fold (lidocaine) to 25-fold (tetracaine) more potent at the fast sodium channel than at the 5-HT3 receptor channel. The rank order of potency for general anaesthetics was propofol > etomidate = alfaxalone = ketamine > thiopental = methohexital at the fast sodium channel, and propofol ≥ etomidate > alfaxalone = methohexital > thiopental > ketamine at the 5-HT3 receptor channel. With the exception of ketamine, which was about equipotent at both channels, the general anaesthetics were between 2.2 to 8.1-fold more potent at the 5-HT3 receptor channel than at the fast sodium channel. Propofol and alfaxalone non-competitively inhibited the 5-HT-induced influx of 14C-guanidinium. The pIC50 values of local and general anaesthetics for inhibition of veratridine-induced 14C-guanidinium influx were correlated with the lipophilicity (log P values) of these compounds, whereas no correlation was found between the corresponding paramaters for the 5-HT-induced influx.
In conclusion, the results indicate that not only the fast Na+ channel but also the 5-HT3 receptor channel is a target for local and general anaesthetics. The relative high inhibitory potencies of the general anaesthetics which were not correlated with log P values argue in favour of a specific interaction of these agents with the 5-HT3 receptor channel.
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Barann, M., Göthert, M., Fink, K. et al. Inhibition by anaesthetics of 14C-guanidinium flux through the voltage-gated sodium channel and the cation channel of the 5-HT3 receptor of N1E-115 neuroblastoma cells. Naunyn-Schmiedeberg's Arch Pharmacol 347, 125–132 (1993). https://doi.org/10.1007/BF00169256
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DOI: https://doi.org/10.1007/BF00169256