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Blockers of NMDA-operated channels decrease glutamate and aspartate extracellular accumulation in striatum during forebrain ischaemia in rats.

O Ghribi·J Callebert·C Verrecchia·M Plotkine·R G Boulu
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Abstract

Brain microdialysis was used to study changes in the glutamate and aspartate extracellular concentrations in the striatum of conscious rats submitted to 30 minutes cerebral ischaemia, using the four-vessel occlusion model. Perfusion of the N-methyl-D-aspartate (NMDA) receptor channel blockers, dizocilpine (MK-801; 75 microM) and Mg2+ (2.5 mM), inhibited the ischaemia-induced accumulation of glutamate and aspartate. The AMPA/kainate receptor antagonist, 2,3-dihydroxy-6-nitro-7-sulfamylbenzo (F) quinoxaline (NBQX; 15 microM and 450 microM) had no effect on glutamate and aspartate levels during ischaemia. On the other hand, omission of Ca2+ from the perfusing solution did not alter the increases in glutamate and aspartate induced by ischaemia. These results suggest that the glutamate and aspartate accumulation in four-vessel occlusion ischaemia is mediated by activation of NMDA receptors in a Ca2+ independent manner.

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AnimalsAspartic AcidBrain IschemiaCalciumCorpus StriatumDizocilpine MaleateGlutamic AcidMagnesiumMaleMicrodialysisProsencephalonQuinoxalinesRatsRats, WistarReceptors, AMPAReceptors, N-Methyl-D-AspartateJournal Article

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O Ghribi, J Callebert, C Verrecchia, M Plotkine, R G Boulu. 1995. Blockers of NMDA-operated channels decrease glutamate and aspartate extracellular accumulation in striatum during forebrain ischaemia in rats.. https://doi.org/10.1111/j.1472-8206.1995.tb00273.x

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