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• W2088544095 abstract "Current work has shown that spinal excitatory amino acid receptor activation can evoke physiological phenomena that may be mediated by the subsequent depolarization of glutamate-containing neurons and the activation of cyclo-oxygenase systems. To investigate this phenomenon, rats were implanted with lumbar intrathecal loop dialysis catheters for perfusion and an additional lumbar intrathecal PE-10 catheter for drug delivery. Two days after implantation, kainic acid (1 microgram) was injected intrathecally under light (0.5%) halothane anaesthesia and the spinal release of several amino acids and prostaglandin E2 was examined. Resting concentrations (mean expressed as pmol/25 microliters) of glutamate (89), aspartate (9), serine (387), glycine (597), taurine (185), asparagine (113) and prostaglandin E2 (0.43) were observed. Intrathecal kainic acid produced significant signs of arousal in the rat and evoked a significant increase (mean +/- S.E.M. of % baseline concentration) in aspartate (445 +/- 127%) and glutamate (221 +/- 35%). Prostaglandin E2 concentration was increased in the second post-injection sample (180 +/- 36%). Intrathecal pretreatment with 6-cyano-7-nitroquinoxaline-2, 3-dione (3 micrograms or 10 micrograms), a non-N-methyl-D-aspartate receptor antagonist, blocked amino acid but not prostaglandin E2 release after kainic acid injection. Pretreatment with MK-801 (10 micrograms; non-competitive NMDA receptor antagonist) had no significant effect on evoked release of amino acids or prostaglandin E2. Indomethacin (10 micrograms, a cyclo-oxygenase inhibitor) pretreatment significantly decreased baseline prostaglandin E2 release in control animals (61 +/- 6%) and suppressed kainic acid-evoked aspartate, taurine and prostaglandin E2 release, but had no effect on the concentration of glutamate after kainic acid injection. These data suggest that activation of spinal kainic acid receptors provides a powerful stimulus for secondary excitatory amino acid release and, consistent with the concurrent appearance of prostaglandin E2, that this release is potentiated by the release of a cyclo-oxygenase product." @default.
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• W2088544095 date "1996-10-01" @default.
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• W2088544095 title "Effect of spinal kainic acid receptor activation on spinal amino acid and prostaglandin E2 release in rat" @default.
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• W2088544095 doi "https://doi.org/10.1016/0306-4522(96)00294-1" @default.
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