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  • Title: Favorable effect of catechol-O-methyltransferase inhibition by OR-462 in experimental models of Parkinson's disease.
    Author: Lindén IB, Nissinen E, Etemadzadeh E, Kaakkola S, Männistö P, Pohto P.
    Journal: J Pharmacol Exp Ther; 1988 Oct; 247(1):289-93. PubMed ID: 3171977.
    Abstract:
    A selective catechol-O-methyltransferase inhibitor, OR-462, was studied for its ability to affect pharmacokinetic properties of L-dopa after the p.o. administration of the inhibitor to rats and mice. When OR-462 was given to rats at the dose range of 0.3 to 30 mg/kg in conjunction with L-dopa and carbidopa, a dose-related and long-lasting (greater than 5 hr) increase in striatal L-dopa and dopamine levels as well as a reduction in 3-O-methyldopa levels were shown. For a 50% reduction of the 3-O-methyldopa levels a dose of 6 mg/kg of OR-462 was needed. The increase in striatal homovanillic acid, an O-methylated metabolite of dopamine which poorly penetrates the blood brain barrier, indicates that O-methylation was not inhibited in the brain. In order to get the same dopamine levels in striatum the L-dopa dose could be lowered to one-fourth when OR-462 was added. The L-dopa-sparing effect of OR-462 given p.o. was also demonstrated in two behavioral parkinsonian models. OR-462 given at doses of 3 to 30 mg/kg in conjunction with L-dopa and carbidopa, dose-dependently potentiated the L-dopa-induced reversal of hypoactivity in reserpinized mice. Likewise, the same doses of OR-462 caused a marked potentiation of L-dopa-induced contralateral turning behavior in rats with unilateral nigrostriatal lesions produced by 6-hydroxydopamine. The data suggest a possible beneficial effect of OR-462 in the therapy of Parkinson's disease.
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