Effects of Drugs Affecting the Noradrenergic System on Convulsions in the Quaking Mouse

Overview

Journal Naunyn Schmiedebergs Arch Pharmacol

Specialty Pharmacology

Date 1981 Dec 1

PMID 6276790

Citations 5

Authors

R Chermat

L Doare

F Lachapelle

P Simon

Affiliations

Soon will be listed here.

Abstract

Handling-induced convulsions in the quaking mouse can be blocked by: phenobarbital, pentobarbital or phenytoin; postsynaptic alpha-adrenoceptor agonists (noradrenaline, phenylephrine, CRL 40028); presynaptic alpha-adrenoceptor blockers (yohimbine, mianserine); catecholamine liberating agent (amphetamine); noradrenaline reuptake inhibitors (cocaine, imipramine, desipramine). Moreover, the protective effect of yohimbine was antagonized by clonidine, prazosin or alpha-methylparatyrosine, and the protective effect of CRL 40028 was antagonized by prazosin but not by alpha-methyltyrosine. Drugs acting by other mechanisms (pilocarpine, atropine, trihexyphenidyl, (--)-5-HTP, methysergide, pimozide, clonidine, alpha-methyl DOPA, prazosin, isoprenaline, salbutamol) did not protect against convulsions. A slight protection was obtained with high doses of apomorphine and also with (+/-)-propranolol. This effect is probably not related to blockade of beta-adrenoceptors because the same effect was obtained with (+)propranolol. In young quaking mice, where susceptibility to convulsions is low, both postsynaptic alpha-adrenoceptor blockers and presynaptic alpha-adrenoceptor antagonist lowered the convulsive threshold. Thus, this seems to constitute an interesting model for the in vivo study of substances which affect the central alpha-adrenoceptors either pre- or postsynaptically.

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