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The FASEB Journal, Vol 6, 3338-3344, Copyright © 1992 by The Federation of American Societies for Experimental Biology
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MF Beal
Neurochemistry Laboratory, Massachusetts General Hospital, Boston.
Excitotoxicity refers to neuronal cell death caused by activation of excitatory amino acid receptors. A substantial body of evidence has implicated excitotoxicity as a mechanism of cell death in both acute and chronic neurologic diseases. A major recent advance has been the successful cloning and expression of the N-methyl-D-aspartate (NMDA), non-NMDA, and metabotropic glutamate receptors. The cellular mechanisms responsible for cell death after activation of these receptors are still being clarified. In acute neurologic diseases such as stroke and head trauma, excitotoxicity may be related to excessive glutamate release. In chronic neurodegenerative diseases, however, a slow excitotoxic process is more likely to occur as a consequence of either a receptor abnormality or an impairment of energy metabolism. Recent therapeutic studies have demonstrated the efficacy of non-NMDA receptor antagonists in experimental studies of global ischemia.
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