Studies on the involvement of dopamine D-1 and D-2 receptors in the anticonvulsant effect of dopamine agonists in various rodent models of epilepsy
Abstract
Dopamine agonists with different selectivity for dopamine D-1 and D-2 receptors in the brain were tested for their effects: on thresholds for maximal electroshock seizures in mice and rats and for pentylenetetrazol-induced clonic seizures in mice; on seizures induced by air blast stimulation in gerbils, and on seizures induced by amygdala-kindling in rats. The mixed D-1/D-2 agonist apomorphine exerted anticonvulsant effects in all models except kindling. In gerbils and mice, the anticonvulsant action of apomorphine could be antagonized by the D-2 selective dopamine antagonist sulpiride. When injected alone, sulpiride exerted no significant effect on seizure activity. The preferential D-2 receptor agonists lisuride and (+)-PHNO [+)-4-propyl-9-hydroxynaphthoxazine) differed in their profile of action. Both compounds displayed anticonvulsant efficacy in gerbils, while only lisuride proved capable of reducing kindled seizure severity. (+)-PHNO increased the threshold for electroconvulsions in mice while lisuride was ineffective in this respect or even decreased the threshold. The reverse was obtained in regard to electroshock seizures in rats. The threshold for seizures induced by pentylenetetrazol in mice was increased significant...Continue Reading
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