PMID: 97703May 31, 1978

A comparison of some pharmacological actions of morphine and delta9-tetrahydrocannabinol in the mouse

Psychopharmacology
A S Bloom, W L Dewey

Abstract

The effects of morphine and delta9-tetrahydrocannabinol(THC)on the tail-flick reflex, body temperature, and catecholamine synthesis were examined in the mouse in order to compare their effects in a single species and strain under uniform conditions. Naloxone antagonism of THC and cross-tolerance between morphine and THC were also studied. Both morphine and THC produced antinociception, hypothermia, and increased catecholamine synthesis at 30 min after s.c. injection. Morphine produced greater increases in dopamine synthesis and was a more potent antinociceptive agent, while THC produced greater increases in norepinephrine synthesis and was a more potent hypothermic agent. Naloxone pretreatment (1 mg/kg) partially antagonized the hypothermia and increase in catecholamine synthesis produced by THC. There was also cross-tolerance between morphine and THC, but it was asymmetric in that THC-tolerant animals were cross-tolerant to only the hypothermic action of morphine and morphine-tolerant animals cross-tolerant to only the antinociceptive action of THC.

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Related Concepts

Antinociceptive Agents
Brain Chemistry
Catecholamines
Drug Tolerance
Mouse, Inbred ICRC
Morphine Sulfate (2: 1), Pentahydrate
Naloxone, (5 beta,9 alpha,13 alpha,14 alpha)-Isomer
Reaction Time
Tetrahydrocannabinol, Trans-(+-)-Isomer

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