Abstract
The El mouse is an inbred strain developed from ddY mice and is very susceptible to seizure. In El mice, convulsions could be induced by 18 mg/kg of pentylenetetrazol, which is an inert dose in ddY mice. The features of the convulsions were the same as those induced by the tossing-up procedure, a common method to evoke convulsions in El mice. Phenytoin, phenobarbital, valproate sodium, and ethosuximide clearly inhibited pentylenetetrazol-induced convulsions in El mice. These findings suggest that induction of convulsions by pentylenetetrazol in the El mouse is a simple method as compared with induction of convulsions by the tossing-up procedure, and convulsions evoked by this method are a precise experimental model for the study of hereditary epilepsy and for the evaluation of anticonvulsant drugs.
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