Summary
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 betaadrenoceptors 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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Chermat, R., Doaré, L., Lachapelle, F. et al. Effects of drugs affecting the noradrenergic system on convulsions in the quaking mouse. Naunyn-Schmiedeberg's Arch. Pharmacol. 318, 94–99 (1981). https://doi.org/10.1007/BF00508832
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DOI: https://doi.org/10.1007/BF00508832