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Investigations into the relationship between the dopaminergic system and ascorbic acid in rat striatum

Desole, Maria Speranza and Miele, Maddalena and Enrico, Paolo and Esposito, Giovanni and Fresu, Luigia Grazia and De Natale, Guglielmo and Miele, Egidio (1991) Investigations into the relationship between the dopaminergic system and ascorbic acid in rat striatum. Neuroscience Letters, Vol. 127 (1), p. 34-38. ISSN 0304-3940. Article.

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DOI: 10.1016/0304-3940(91)90888-Z


Levels of dopamine (DA), 3,4-dihydroxyphenylacetic acid (DOPAC), ascorbic acid (AA) and dehydroascorbic acid (DHAA) were determined by HPLC in the striatum of male Wistar rats after single or repeated injections of apomorphine (1 mg/kg/day s.c.) and/or haloperidol (1 mg/kg/day i.p.), and 24 h after the last drug administration. Apomorphine significantly reduced the DOPAC/DA ratio and increased the DHAA/AA ratio; these ratio changes were significantly correlated (r = −0.9969, P < 0.0005). Haloperidol greatly increased the DOPAC/DA ratio; the DHAA/AA ratio was also slightly increased, but there was no significant correlation. When apomorphine was associated with haloperidol, the resulting DOPAC/DA ratio was significantly lower than after haloperidol alone; the DHAA/AA ratio was also significantly reduced in contrast to the effect of apomorphine alone. It is concluded that a non-selective DA receptor activation mediates, in a correlated way, both the inhibition of DA turnover and the increase of AA oxidation in the rat striatum.

Item Type:Article
ID Code:4166
Uncontrolled Keywords:Apomorphine, haloperidol, ascorbic acid, dopamine turnover, rat striatum
Subjects:Area 05 - Scienze biologiche > BIO/14 Farmacologia
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze biomediche
001 Università di Sassari > 01 Dipartimenti > Neuroscienze, scienze materno infantili
Publisher:Elsevier Science Ireland
Deposited On:14 Jul 2010 13:39

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