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Monoaminergic effects of folinic acid, L-DOPA, and 5-hydroxytryptophan in dihydropteridine reductase deficiency.

Authors
Goldstein, DS; Hahn, SH; Holmes, C; Tifft, C; Harvey-White, J; Milstien, S; Kaufman, S
Citation
Journal of neurochemistry, 64(6):2810-2813, 1995
Journal Title
Journal of neurochemistry
ISSN
0022-30421471-4159
Abstract
Plasma and CSF concentrations of endogenous L-DOPA, catecholamines, and metabolites of monoamines were assayed in a patient with atypical phenylketonuria due to absent dihydropteridine reductase (DHPR), before and during treatment with folinic acid, Sinemet, and 5-hydroxytryptophan. The patient had low but detectable levels of L-DOPA, 3,4-dihydroxyphenylacetic acid (DOPAC), and 3,4-dihydroxyphenylglycol (DHPG) in plasma and low but detectable levels of these compounds and of homovanillic acid (HVA) and 5-hydroxyindoleacetic acid (5-HIAA) in CSF, with approximately normal plasma and CSF levels of norepinephrine [noradrenaline (NA)]. Folinic acid treatment approximately doubled plasma levels of L-DOPA, NA, DOPAC, and DHPG, compared with values during dietary phenylalanine restriction alone. Detection of L-DOPA, catecholamines, and monoamine metabolites in this patient indicates that monoamine synthesis in humans does not absolutely require DHPR. The results are consistent with the existence of an alternative biochemical pathway, with folinic acid treatment augmenting activity along this pathway. Low plasma levels of L-DOPA, DOPAC, and DHPG may reflect decreased catecholamine synthesis and turnover in sympathetic nerves, with compensatory increases in exocytotic release normalizing plasma NA levels.
MeSH terms
5-Hydroxytryptophan/*therapeutic useBiogenic Monoamines/*metabolismHumansInfantLeucovorin/*therapeutic useLevodopa/*therapeutic useMale*Phenylketonurias
PMID
7760062
Appears in Collections:
Journal Papers > School of Medicine / Graduate School of Medicine > Pediatrics & Adolescent Medicine
AJOU Authors
한, 시훈
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