THC Prevents MDMA Neurotoxicity in Mice

• Published in: PloS one Vol. 5; no. 2; p. e9143
• Main Authors: Touriño, Clara, Zimmer, Andreas, Valverde, Olga
• Format: Journal Article
• Language: English
• Published: United States Public Library of Science 10.02.2010; Public Library of Science (PLoS)
• Subjects: Activation; Alcohol; Ambient temperature; Animals; Antioxidants; Astrocytes - drug effects; Astrocytes - metabolism; Body temperature; Body Temperature - drug effects; Brain; Cannabinoid CB1 receptors; Cannabinoid CB2 receptors; Cannabinoides; Cannabis; Dopamine; Drogues; Dronabinol - pharmacology; Drug abuse; Drugs; Ecstasy; Ecstasy (Drug); Efectes fisiològics; Fever; Fever - chemically induced; Fever - prevention & control; Genetically modified animals; Hallucinogens - toxicity; Hyperthermia; Indoles - pharmacology; Inflammation; Marijuana; MDMA; MDMA (Droga); Mental Health/Substance Abuse; Mice; Mice, Inbred C57BL; Mice, Knockout; Microglia - drug effects; Microglia - metabolism; N-Methyl-3,4-methylenedioxyamphetamine - toxicity; Neostriatum; Neurological Disorders/Neuropharmacology; Neuroprotection; Neurotoxicity; Neurotoxicity Syndromes - etiology; Neurotoxicity Syndromes - prevention & control; Oxidative stress; Pharmacology; Pharmacology/Drug Interactions; Physiology; Piperidines - pharmacology; Psychotropic Drugs - pharmacology; Pyrazoles - pharmacology; Receptor, Cannabinoid, CB1 - antagonists & inhibitors; Receptor, Cannabinoid, CB1 - genetics; Receptor, Cannabinoid, CB1 - metabolism; Receptor, Cannabinoid, CB2 - antagonists & inhibitors; Receptor, Cannabinoid, CB2 - genetics; Receptor, Cannabinoid, CB2 - metabolism; Receptors; Rodents; Temperature; Temperature effects; Tetrahydrocannabinol; Young adults; United Kingdom > UK; France; Germany; Spain
• DOI: 10.1371/journal.pone.0009143
• ISSN: 1932-6203

The majority of MDMA (ecstasy) recreational users also consume cannabis. Despite the rewarding effects that both drugs have, they induce several opposite pharmacological responses. MDMA causes hyperthermia, oxidative stress and neuronal damage, especially at warm ambient temperature. However, THC, the main psychoactive compound of cannabis, produces hypothermic, anti-inflammatory and antioxidant effects. Therefore, THC may have a neuroprotective effect against MDMA-induced neurotoxicity. Mice receiving a neurotoxic regimen of MDMA (20 mg/kg x 4) were pretreated with THC (3 mg/kg x 4) at room (21 degrees C) and at warm (26 degrees C) temperature, and body temperature, striatal glial activation and DA terminal loss were assessed. To find out the mechanisms by which THC may prevent MDMA hyperthermia and neurotoxicity, the same procedure was carried out in animals pretreated with the CB(1) receptor antagonist AM251 and the CB(2) receptor antagonist AM630, as well as in CB(1), CB(2) and CB(1)/CB(2) deficient mice. THC prevented MDMA-induced-hyperthermia and glial activation in animals housed at both room and warm temperature. Surprisingly, MDMA-induced DA terminal loss was only observed in animals housed at warm but not at room temperature, and this neurotoxic effect was reversed by THC administration. However, THC did not prevent MDMA-induced hyperthermia, glial activation, and DA terminal loss in animals treated with the CB(1) receptor antagonist AM251, neither in CB(1) and CB(1)/CB(2) knockout mice. On the other hand, THC prevented MDMA-induced hyperthermia and DA terminal loss, but only partially suppressed glial activation in animals treated with the CB(2) cannabinoid antagonist and in CB(2) knockout animals. Our results indicate that THC protects against MDMA neurotoxicity, and suggest that these neuroprotective actions are primarily mediated by the reduction of hyperthermia through the activation of CB(1) receptor, although CB(2) receptors may also contribute to attenuate neuroinflammation in this process.