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1999 Colado MDMA Neurotoxicity Study
Studies on the neuroprotective effect of pentobarbitone on MDMA-induced neurodegeneration,
by M.I. Colado; B. Esteban; E. O'Shea; R. Granados; A.R. Green
Psychopharmacology Vol 142, 1999; 421-425

Administration of a dose of 15 mg/kg of the recreationally used drug 3,4-methylenedioxymethamphetamine (MDMA or "ecstasy") to Dark Agouti rats resulted in an acute hyperthermic response which was followed 7 days later by a marked (\approx45%) loss of 5-HT and its metabolite 5-HIAA in cortex, hippocampus and striatum and a similar loss of [3H]-paroxetine binding in cortex. These losses reflect the MDMA-induced neurotoxic degeneration of 5-HT nerve endings. Administration of pentobarbitone (40 mg/kg) concurrently with MDMA produced a significant attenuation of the neurotoxic damage, but also acute hypothermia. When the temperature of the MDMA plus pentobarbitone-treated group was kept elevated to that of the MDMA-treated group by the use of a homeothermic blanket, the neuroprotective effect of pentobarbitone was lost. These data demonstrate that pentobarbitone appears to possess no intrinsic neuroprotective activity and the previously reported activity is due to a hypothermic action of the drug.