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- W2069388640 abstract "Kynurenine, a metabolite of tryptophan along the 'kynurenine pathway', is at a branch point of the pathway which can lead to the synthesis of both quinolinic acid (QUIN) and kynurenic acid (KYNA). KYNA is an antagonist of glutamate receptors; however, QUIN is a selective agonist of NMDA receptors, and has been shown to act as an excitotoxic agent. A high QUIN/KYNA ratio has been implicated in a variety of neurological diseases in which excitotoxic neuronal cell death is found, e.g. AIDS-related dementia, stroke, etc. Inhibiting the key enzymes of this pathway (i.e. kynureninase and kynurenine 3-hydroxylase) would lower the QUIN/KYNA ratio, which may potentially have neuroprotective effects. We have developed high through-put assays for kynurenine pathway enzymes which allow us to screen extracts from marine organisms for selective enzyme inhibitors. Active metabolites are purified, isolated and identified by HPLC, high-field NMR and mass spectral techniques. Extracts from a sponge of the Aka species were found to contain a selective inhibitor of kynureninase. We have recently purified and identified the active principal as being serotonin sulfate. Related indoleamines, serotonin and 5-hydroxyindoleacetic acids are inactive. This finding may be suggestive of a novel interaction between the serotoninergic and excitatory amino acid pathways." @default.
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- W2069388640 date "2000-04-01" @default.
- W2069388640 modified "2023-09-25" @default.
- W2069388640 title "Screening marine natural products for selective inhibitors of key kynurenine pathway enzymes" @default.
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- W2069388640 doi "https://doi.org/10.1179/135100000101535636" @default.
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