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[The antiataxic mechanism of TRH in rolling mouse Nagoya: the effects of pretreatment with dopaminergic and cholinergic drugs].

Antiataxic mechanisms were investigated in Rolling mouse Nagoya (RMN). The present study was to elucidate the influence of dopaminergic (pimozide, apomorphine) and cholinergic (atropine, physostigmine) drugs on the antiataxic effect of TRH. The degree of ataxic gait and spontaneous motor activities in RMN were measured by the open field method and ANIMEX-II Pretreatment with pimozide and apomorphine had no influence on the antiataxic effects of TRH, while pretreatment with physostigmine suppressed these effects and in contrast, with atropine, increased then. The increase of spontaneous motor activities after TRH injection was antagonized by pretreatment with pimozide and physostigmine, but accentuated by pretreatment with atropine. These results may indicate that the antiataxic effects of TRH are, at least partially, mediated by the cholinergic mechanism.