| Conjugates of catecholamines with cysteine and GSH in Parkinson's disease: possible mechanisms of formation involving reactive oxygen species. | |
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MedLine Citation:
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PMID: 9798937 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Oxidation of L-3,4-dihydroxyphenylalanine (L-DOPA) and dopamine (DA) to generate semiquinones/quinones, oxygen radicals, and other reactive oxygen species may play a role in neuronal cell death in Parkinson's disease (PD). In particular, semiquinones/quinones can form conjugates with thiol compounds such as GSH and cysteine. Exposure of L-DOPA, DA, and other catecholamines to a system generating O2.- radical led to O2(.-)-dependent depletion of added GSH (or cysteine), accompanied by the formation of thiol-DA or -DOPA adducts as detected by HPLC. Superoxide could additionally cause destruction of these adducts. Iron or copper ions could also promote conjugate formation between GSH or cysteine and DA and L-DOPA, especially if H2O2 was present. We applied HPLC to measure glutathionyl and cysteinyl conjugates of L-DOPA, DA, and 3,4-dihydroxyphenylacetic acid (DOPAC) in postmortem brain samples from PD patients and normal control subjects. Conjugates were detected in most brain areas examined, but levels were highest in the substantia nigra and putamen. In most regions, adduct levels were lower in PD, but there were significant increases in cysteinyl adducts of L-DOPA, DA, and DOPAC in PD substantia nigra, suggesting that acceleration of L-DOPA/DA oxidation occurs in PD, although we cannot say if this is a primary feature of the disease or if it is related to therapy with L-DOPA. In vitro, conjugate formation could be inhibited by the dithiol dihydrolipoate but not by its oxidised form, lipoic acid. |
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Authors:
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J P Spencer; P Jenner; S E Daniel; A J Lees; D C Marsden; B Halliwell |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal of neurochemistry Volume: 71 ISSN: 0022-3042 ISO Abbreviation: J. Neurochem. Publication Date: 1998 Nov |
Date Detail:
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Created Date: 1998-11-30 Completed Date: 1998-11-30 Revised Date: 2004-11-17 |
Medline Journal Info:
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Nlm Unique ID: 2985190R Medline TA: J Neurochem Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 2112-22 Citation Subset: IM |
Affiliation:
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Neurodegenerative Disease Research Centre, University of London King's College, England, UK. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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3,4-Dihydroxyphenylacetic Acid
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metabolism* 8,11,14-Eicosatrienoic Acid / pharmacology Aged Aged, 80 and over Chromatography, High Pressure Liquid Copper / pharmacology Cysteine / metabolism* Dihydroxyphenylalanine / analogs & derivatives, metabolism* Dopamine / metabolism* Glutathione / metabolism* Humans Hypoxanthine / metabolism Iron / pharmacology Parkinson Disease / metabolism* Reactive Oxygen Species / metabolism Reference Values Superoxides / metabolism Xanthine / metabolism |
| Chemical | |
Reg. No./Substance:
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0/5-S-cysteinyl-3,4-dihydroxyphenylalanine; 0/Reactive Oxygen Species; 102-32-9/3,4-Dihydroxyphenylacetic Acid; 11062-77-4/Superoxides; 52-90-4/Cysteine; 63-84-3/Dihydroxyphenylalanine; 68-94-0/Hypoxanthine; 69-89-6/Xanthine; 70-18-8/Glutathione; 7324-41-6/8,11,14-Eicosatrienoic Acid; 7439-89-6/Iron; 7440-50-8/Copper |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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