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Intrathecal (i.t.) administration of D-ala2-methionine-enkephalinamide (DALA) and methadone induces pronounced hindlimb catalepsy in rats. DALA is more potent than methadone in inducing this behavior and catalepsy induced by both compounds is partially blocked by prior treatment with naltrexone. Intrathecal morphine induces convulsive hindlimb activity at doses of 25, 100 and 400 micrograms. However, only the highest dose produces indications of cataleptic behavior. It is suggested that whereas the convulsive behavior induced by i.t. morphine is not mediated by specific opiate receptors, catalepsy induced by all 3 compounds is.
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