British Journal of Anaesthesia, Vol 75, Issue 1 61-65, Copyright © 1995 by The Board of Management and Trustees of the British Journal of Anaesthesia
B. Nicol, D. J. Rowbotham and D. G. Lambert
We have examined the effects of thiopentone, propofol and ketamine 3- 300
mumol litre-1, 3.6%, 2.4 rat MAC of isoflurane, 3.0%, 2.4 rat MAC of
halothane and morphine 0.1-10 mumol litre-1 on uptake of [3H]glutamate into
rat cerebrocortical and cerebellar synaptosomes. Corticol and cerebellar
synaptosomes took up [3H]glutamate in a time-, concentration-,
Na(+)-dependent and L-transpyrrolidine-2,4- dicarboxylate inhibitory
manner. The Km and Vmax values for uptake were 8.6 mumol litre-1 and 1.7
nmol/min/mg protein and 2.2 mumol litre-1 and 0.7 nmol/min/mg protein in
cortical and cerebellar preparations, respectively. At clinically relevant
concentrations none of the agents tested influenced the uptake process. Our
data suggest that the uptake of glutamate is not a major target site for
anaesthetic or analgesic agents.
LABORATORY INVESTIGATIONS
Glutamate uptake is not a major target site for anaesthetic agents
University Department of Anaesthesia, Leicester Royal Infirmary, Leicester LE1 5WW
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