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British Journal of Anaesthesia, Vol 79, Issue 1 78-83, Copyright © 1997 by The Board of Management and Trustees of the British Journal of Anaesthesia

LABORATORY INVESTIGATIONS

Effect of halothane on K+ and carbachol stimulated [3H]noradrenaline release and increased [Ca2+]i in SH-SY5Y human neuroblastoma cells

R. Atcheson, K. Bjornstrom, R. A. Hirst, D. J. Rowbotham and D. G. Lambert
University Department of Anaesthesia, Leicester Royal Infirmary, Leicester LE1 5WW; Department of Anaesthesia and Intensive Care, University Hospital, S-581 85 Linkoping, Sweden

We have examined the effects of the volatile general anaesthetic agent, halothane, on K+ and carbachol stimulated [3H]noradrenaline release and associated increases in intracellular Ca2+ in a cultured human neuroblastoma cell line, SH-SY5Y. K+ (but not carbachol) stimulated [3H]noradrenaline release, and the increase in intracellular Ca2+ concentration was entirely extracellular Ca2+ dependent. Halothane produced a dose-dependent reduction in K+ evoked release of [3H]noradrenaline with significant inhibition (17%) occurring from 1.26 atm%. Basal and carbachol evoked release were unaffected. Halothane also produced a dose-dependent reduction in K+ evoked increases (measured at the peak) in intracellular Ca2+ with significant inhibition (29%) occurring from 0.88 atm%. K+ plateau, basal and carbachol evoked increases in intracellular Ca2+ were unaffected. These data suggest that halothane reduced Ca2+ entry through voltage- sensitive Ca2+ channels and implicate this important class of ion channel in the mechanism of anaesthesia.
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