Electrophysiological effects of exogenous and endogenous kynurenic acid in the rat brain: studies in vivo and in vitro (original) (raw)

Summary.

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 KD 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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Authors and Affiliations

  1. Departments of Pharmacology and Neurology, Columbia University, College of Physicians and Surgeons, New York, New York, U.S.A., , , , , , US
    H. E. Scharfman
  2. Neurology Research Center, Helen Hayes Hospital, West Haverstraw, New York, U.S.A., , , , , , US
    J. H. Goodman
  3. Maryland Psychiatric Research Center, University of Maryland School of Medicine, Baltimore, Maryland, U.S.A., , , , , , US
    R. Schwarcz

Authors

  1. H. E. Scharfman
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  2. J. H. Goodman
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  3. R. Schwarcz
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Received August 31, 1999 Accepted September 20, 1999

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Scharfman, H., Goodman, J. & Schwarcz, R. Electrophysiological effects of exogenous and endogenous kynurenic acid in the rat brain: studies in vivo and in vitro.Amino Acids 19, 283–297 (2000). https://doi.org/10.1007/s007260070060

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