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• W2079334587 abstract "The neuroprotective potential of an antagonist (7-chlorokynurenic acid (7-CIKYNA)) and a low efficacy partial agonist (HA-966) for the glycine modulatory site on theN-methyl-d-aspartate (NMDA) receptor complex has been examined using a neuronal cell culture/hypoxia model of neurodegeneration. Their effects were compared to those of the potent uncompetitive NMDA antagonist, MK-801. Hypoxic cell injury was assessed visually and quantified by measuring the appearance of two cytosolic enzymes, lactate dehydrogenase (LDH) and neurone specific enolase (NSE), in the culture medium. MK-801 prevented the hypoxia-induced cell mortality in a concentration-related manner with anIC50 of 15 nM against increases in LDH levels. HA-966 and 7-CIKYNA also produced concentration-related protective effects withIC50s of 175 and 18 μM, respectively. Although both glycine antagonists were considerably weaker than MK-801 their maximum neuroprotective effects were comparable to that produced by MK-801, i.e. complete protection. This indicates that the level of NMDA receptor activation which can take place in the presence of the partial agonist HA-966 is insufficient to cause permanent neuronal damage. Concentration-effect curves were similar when NSE was used as the marker enzyme, supporting previous observations that the increases in LDH levels accurately and specifically reflect neuronal cell death. These results provide further evidence that hypoxia-induced injury to cortical neuronal cultures is mediated by an excessive stimulation of NMDA receptors and that glycine-site antagonists and partial agonists may have therapeutic potential in conditions where pathologically high levels of NMDA receptor activation are thought to occur." @default.
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• W2079334587 date "1990-10-01" @default.
• W2079334587 modified "2023-10-18" @default.
• W2079334587 title "The effect of NMDA receptor glycine site antagonists on hypoxia-induced neurodegeneration of rat cortical cell cultures" @default.
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• W2079334587 doi "https://doi.org/10.1016/0006-8993(90)90772-4" @default.
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