title: Re-evaluation of the L-dopa loading effect on dopamine metabolism in rat striatum.
abstract: Investigation by HPLC with electrochemical detection of dopamine (DA) metabolism in rat striatum after L-dopa + benserazide treatment allowed quantification of the time course evolution of DA, 3,4-dihydroxyphenylacetic acid and homovanillic acid levels. Furthermore, four peaks which did not appear in controls, were detected in treated striatum. One was identified as 3-methoxytyrosine, the level of which was still high 9 h after treatment. 3-Methoxytyrosine, has been detected previously in plasma of parkinsonian patients treated with L-dopa, and the disturbance in DA metabolism could explain some of the side-effects induced by that treatment.
authors.forename: G
authors.initials: G
authors.lastname: el Gemayel
authors.forename: J H
authors.initials: JH
authors.lastname: Trouvin
authors.forename: M
authors.initials: M
authors.lastname: Prioux-Guyonneau
authors.forename: C
authors.initials: C
authors.lastname: Jacquot
authors.forename: Y
authors.initials: Y
authors.lastname: Cohen
mesh_terms: D015102:3,4-Dihydroxyphenylacetic Acid / Q000378:metabolism; D000818:Animals; D001545:Benserazide / Q000494:pharmacology; D002851:Chromatography, High Pressure Liquid; D003342:Corpus Striatum / Q000378:metabolism*; D004298:Dopamine / Q000378:metabolism*; D004359:Drug Therapy, Combination; D006719:Homovanillic Acid / Q000378:metabolism; D007980:Levodopa / Q000494:pharmacology*; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains; D014443:Tyrosine / Q000031:analogs & derivatives / Q000378:metabolism
chemical_list: D015102:3,4-Dihydroxyphenylacetic Acid; D014443:Tyrosine; D007980:Levodopa; D001545:Benserazide; C008404:3-methoxytyrosine; D004298:Dopamine; D006719:Homovanillic Acid