PMID: 10429Nov 1, 1976

Precipitation of abstinence-like syndrome in morphine-dependent mice by pargyline

The Journal of Pharmacology and Experimental Therapeutics
E L WayH H Loh


In mice rendered morphine-dependent by pellet implantation for 3 days, the administration of pargyline 6 hours after pellet removal intensified narcotic abstinence behavior, particularly the narcotic withdrawal jumping response. Pargyline, 75 mg/kg i.p., caused a 6- to 9-fold increase in the incidence of jumping in mice withdrawing from morphine 6 hours after removal of the pellet, whereas this effect was not observed: 1) 1 hour after the injection of pargyline or 2) in animals still implanted with the morphine pellet. The median effective dose (ED50) of pargyline required to elicit withdrawal jumping in mice implanted with morphine decreased with increasing physical dependence. The ED50 for 72 hours was about one-sixth that after 24 hours of implantation. Additionally, pargyline potentiated naloxone-precipitated withdrawal jumping as evidenced by a reduction of the naloxone ED50 by approximately one-half. Administration of other monoamine oxidase inhibitors such as pheniprazine, iproiazid or tranylcypromine failed to alter the indicence of jumping in dependent mice undergoind abrupt morphine with drawal. Further, dopamine receptor stimulation by amphetamine, pheniprazine or amantadine antagonized the pargyline-induced jumping ...Continue Reading

Related Concepts

Behavior, Animal
Dose-Response Relationship, Drug
Drug Augmentation
Mouse, Inbred ICRC
Morphine Abuse
Naloxone, (5 beta,9 alpha,13 alpha,14 alpha)-Isomer

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