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Kynurenic acid (KYNA), the only known endogenous glutamate antagonist, is produced in the brain by kynurenine aminotransferases (KATs) I and II. Mitochondrial toxins, 1-methyl-4-phenylpyridinium (MPP+) and 3-nitropropionic acid (3-NPA), were previously shown to reduce KYNA synthesis via interference with KAT I and II. Data presented here demonstrate that immunophilin ligand, FK506 (10-130 muM), but...
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