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Abstract

SR 95191, a selective inhibitor of type A monoamine oxidase with dopaminergic properties. I. Psychopharmacological profile in rodents.

P Worms, J P Kan, C G Wermuth, R Roncucci and K Bizière
Journal of Pharmacology and Experimental Therapeutics January 1987, 240 (1) 241-250;
P Worms
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J P Kan
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C G Wermuth
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R Roncucci
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K Bizière
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Abstract

SR 95191 [3-(2-morpholino-ethyl-amino)-4-cyano-6-phenyl-pyridazine], a novel compound, has been shown in preliminary experiments to inhibit type A monoamine oxidase (MAO). This report describes the activities of SR 95191 in behavioral experiments in mice and rats and shows that SR 95191 has the profile of a selective type A MAO inhibitor (MAOI). Moreover, SR 95191 also possesses dopamine (DA) stimulant properties. The activities of SR 95191 were compared to those of the MAOIs moclobemide, clorgyline, pargyline and l-deprenyl, as well as to those of the antidepressant drugs imipramine, nomifensine and indalpine and to those of the DAergic drugs (+)-amphetamine and apomorphine. SR 95191 p.o. antagonized the effects of reserpine in mice and rats, decreased immobility in the mouse despair test, antagonized haloperidol-induced catalepsy in rats and potentiated 5-hydroxytryptophan in mice and rats with an overall potency which was half that of imipramine. SR 95191, like moclobemide, did not potentiate yohimbine-induced lethality and did not antagonize oxotremorine-induced tremor. Like selective type A MAOIs, SR 95191 potentiated 5-hydroxytryptophan-induced tremor without affecting beta-phenethylamine-induced stereotypies in mice. SR 95191 did not antagonize 3-hydroxy-4-methyl-alpha-phenylethylamine-induced hyperthermia. Like all DA stimulant drugs, SR 95191 induced stereotypies in rats, which were blocked by haloperidol and alpha-methylparatyrosine, and induced contralateral turning in mice with a unilateral striatal 6-hydroxydopamine lesion. Based on these results, it is postulated that SR 95191 has a unique profile of activity combining the properties of a selective type A MAO inhibitor and those of an atypical DAergic drug.

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Journal of Pharmacology and Experimental Therapeutics
Vol. 240, Issue 1
1 Jan 1987
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Abstract

SR 95191, a selective inhibitor of type A monoamine oxidase with dopaminergic properties. I. Psychopharmacological profile in rodents.

P Worms, J P Kan, C G Wermuth, R Roncucci and K Bizière
Journal of Pharmacology and Experimental Therapeutics January 1, 1987, 240 (1) 241-250;

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Abstract

SR 95191, a selective inhibitor of type A monoamine oxidase with dopaminergic properties. I. Psychopharmacological profile in rodents.

P Worms, J P Kan, C G Wermuth, R Roncucci and K Bizière
Journal of Pharmacology and Experimental Therapeutics January 1, 1987, 240 (1) 241-250;
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