Catalepsy induced by morphine or haloperidol: effects of apomorphine and anticholinergic drugs - PubMed (original) (raw)
- PMID: 10058
- DOI: 10.1139/y76-071
Catalepsy induced by morphine or haloperidol: effects of apomorphine and anticholinergic drugs
C Erzin-Waters et al. Can J Physiol Pharmacol. 1976 Aug.
Abstract
To investigate the extent of cholinergic involvement in opiate-induced catalepsy, the effects of three anticholinergic drugs were studied on morphine-induced catalepsy. Haloperidol-induced catalepsy was also examined. Maximum catalepsy in rats was obtained with 30 mg/kg morphine or 3 mg/kg haloperidol. The anticholinergic drugs atropine, benztropine, and scopolamine were unable to antagonize morphine-induced catalepsy, yet readily antagonized haloperidol-induced catalepsy. Low doses of apomorphine (7.5 mg/kg), on the other hand, readily antagonized morphine catalepsy, but 13-fold higher doses of apomorphine were needed to block haloperidol-induced catalepsy. The results are compatible with the idea that catalepsy can be mediated via the striatum or the amygdala; morphine-dopamine antagonism may occur in the amygdala, whereas morphine-dopamine-cholinergic interactions occur in the striatum.
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