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Neuropharmacology 2004-Jun

Cannabinoids prevent the acute hyperthermia and partially protect against the 5-HT depleting effects of MDMA ("Ecstasy") in rats.

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Kirsten C Morley
Kong M Li
Glenn E Hunt
Paul E Mallet
Iain S McGregor

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Cannabinoid-MDMA interactions were examined in male Wistar rats. MDMA (4 x 5 mg/kg or 2 x 10 mg/kg over 4 h on each of 2 days) was administered with or without Delta 9-tetrahydrocannabinol (THC) (4 x 2.5 mg/kg), the synthetic cannabinoid receptor agonist CP 55,940 (2 x 0.1 or 0.2 mg/kg) or the cannabinoid receptor antagonist SR 141716 (2 x 5 mg/kg). Co-administered Delta 9-THC and CP 55,940 but not SR 141716 prevented MDMA-induced hyperthermia, causing a powerful hypothermia. Co-administered Delta 9-THC, CP 55,940 and SR 141716 all tended to decrease MDMA-induced hyperactivity. Co-administered Delta 9-THC provided protection against the long-term increases in anxiety seen in the emergence test, but not the social interaction test, 6 weeks after MDMA treatment. Co-administered Delta 9-THC and CP 55,940, but not SR 141716, partly prevented the long-term 5-HT and 5-HIAA depletion caused by MDMA in various brain regions. SR 141716 administered with CP 55,940 and MDMA prevented the hypothermic response to the CP 55,940/MDMA combination but did not alter the CP 55,940 attenuation of MDMA-induced 5-HT depletion. These results suggest a partial protective effect of co-administered cannabinoid receptor agonists on MDMA-induced 5-HT depletion and long-term anxiety. This action appears to operate independently of cannabinoid CB1 receptors.

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