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• W1750932440 abstract "Some cognition enhancers were previously shown to potently prevent antagonism of the N-methyl-D-aspartate (NMDA)-evoked release of norepinephrine (NE) brought about in slices of rat hippocampus by kynurenic acid, an endogenous NMDA receptor blocker. We have examined the impact of putative nootropic agents in the kynurenate test performed with slices of human cerebral cortex from patients undergoing neurosurgery. In slices of human neocortex, local application of NMDA evoked release of [3H]NE; the effect of NMDA was antagonized by several NMDA receptor antagonists, including kynurenic acid. The antagonism of the NMDA-evoked [3H]NE release produced by 300 microM kynurenate was potently (EC50 <10 microM) prevented by most of the nootropics tested, including aniracetam, oxiracetam, D-cycloserine, and the glutamate analog CR 2249 (but not its enantiomer CR 2361). Nicotine or tacrine (up to 10 microM) did not show any effect in the kynurenate test. Nicotine (30-100 microM) itself increased the release of [3H]NE; interestingly, the nicotine-evoked overflow was blocked not only by the nicotin receptor antagonist mecamylamine but also by NMDA receptor antagonists, suggesting an indirect mechanism mediated by glutamate/aspartate release. To conclude, the similarities between the data obtained here with human neocortex slices and those previously obtained in the rat indicate that the kynurenate test performed with rat brain slices may represent a useful biochemical assay to study cognition-enhancing drugs." @default.
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• W1750932440 date "1999-07-01" @default.
• W1750932440 modified "2023-09-23" @default.
• W1750932440 title "Activity of putative cognition enhancers in kynurenate test performed with human neocortex slices." @default.
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