期刊
AMINO ACIDS
卷 19, 期 1, 页码 283-297出版社
SPRINGER WIEN
DOI: 10.1007/s007260070060
关键词
amino acids; anticonvulsant; entorhinal cortex; glycine; hippocampus; N-methyl-D-aspartate; tryptophan
资金
- NINDS NIH HHS [NS 16102] Funding Source: Medline
- NATIONAL INSTITUTE OF NEUROLOGICAL DISORDERS AND STROKE [R01NS016102] Funding Source: NIH RePORTER
In this review, recent studies on the electrophysiological effects of de novo synthesized (endogenous) kynurenic acid (KYNA) are discussed. Endogenous KYNA is normally formed as a byproduct of tryptophan metabolism Evidence for a physiological role in neuronal excitability has not been strong, in part because brain levels are much lower than the K-D of KYNA at the glycine site of the NMDA receptor, where KYNA is thought to exert its most potent effect. The results suggest that, unexpectedly, even low concentrations of endogenous KYNA have physiological consequences. These levels of KYNA reduced the number of hippocampal slices with spontaneous epileptiform discharges after exposure to buffer lacking magnesium. However, effects on evoked responses to single afferent stimuli were not detected. Taken together, the data argue for a potentially important role of endogenous KYNA in suppression of seizure-like activity, and suggest a novel approach to anticonvulsant drug development that could have few side effects.
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