Catechol-O-methyltransferase inhibition increases striatal L-dopa and dopamine: an in vivo study in rats.

Abstract:

:We administered Ro 40-7592, an inhibitor of the enzyme catechol-O-methyltransferase (COMT) that crosses the blood-brain barrier, to rats and monitored extracellular catecholamine levels in the corpus striatum before and after the intraperitoneal administration of a bolus of l-dopa. Acute administration of Ro 40-7592 increased basal levels of l-dopa and dihydroxyphenylacetic acid (DOPAC) and decreased basal homovanillic acid (HVA) levels, but did not affect basal dopamine levels. In rats treated with Ro 40-7592, l-dopa administration produced a greater increase in striatal levels of l-dopa, dopamine, and DOPAC than it did in controls, while HVA formation was attenuated. We conclude that inhibition of COMT activity promotes central dopamine synthesis and release following administration of pharmacologic doses of l-dopa.

journal_name

Neurology

journal_title

Neurology

authors

Brannan T,Martínez-Tica J,Yahr MD

doi

10.1212/wnl.42.3.683

subject

Has Abstract

pub_date

1992-03-01 00:00:00

pages

683-5

issue

3 Pt 1

eissn

0028-3878

issn

1526-632X

journal_volume

42

pub_type

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