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- W1973322463 abstract "The monoamines and their metabolites were analyzed in the intraventricular fluid of parkinsonian patients treated with l-DOPA alone or together with l-threo-3,4-dihydroxyphenylserine (l-threo-DOPS), the precursor amino acids of dopamine and noradrenaline, respectively. In the intraventricular fluid of the patients administered with l-DOPA, the level of dopamine metabolites were higher than control, suggesting enhanced turnover of dopamine in the brain. However, l-DOPA administration increased free noradrenaline only slightly, and did not affect serotonin and its metabolite. On the other hand, by administration of l-DOPA combined with l-threo-DOPS, the levels of monoamines increased in general, whereas the monoamine metabolites by catechol-O-methyltransferase were reduced compared with those in the patients treated with l-DOPA alone. Only a minor part of l-threo-DOPS was metabolized into noradrenaline by aromatic l-amino acid decarboxylase, and it was metabolized mainly by two other enzymes, catechol-O-methyltransferase and DOPS-aldolase in the brain. An overview of the metabolism of neurotransmitters in the brain proved to be useful to evaluate the therapeutic effects of these precursor amino acids." @default.
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- W1973322463 date "1996-07-01" @default.
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- W1973322463 title "The metabolism of l-DOPA and l-threo-3,4-dihydroxyphenylserine and their effects on monoamines in the human brain: analysis of the intraventricular fluid from parkinsonian patients" @default.
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- W1973322463 doi "https://doi.org/10.1016/0022-510x(96)00049-4" @default.
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