Superoxide radicals mediate the biochemical effects of methylenedioxymethamphetamine (MDMA): evidence from using CuZn-superoxide dismutase transgenic mice

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J L CadetT H Moran

Abstract

The subacute and long-term biochemical effects of methylenedioxymethamphetamine (MDMA) were assessed in homozygous and heterozygous transgenic (Tg) mice that carry the complete sequence of the human copper-zinc (CuZn) superoxide dismutase (SOD) gene. Non-transgenic (Non-Tg) mice showed significant decreased in striatal dopamine (DA) and dihydroxyphenylacetic acid (DOPAC) levels both at 24 h and at 2 weeks after a single injection of MDMA (50 mg/kg). Heterozygous SOD-Tg mice showed DA depletion only at the 24 h time point. In contrast, homozygous SOD-Tg mice show no DA or DOPAC depletion at either the 24 h or at the 2 week time points. Moreover, three injections of MDMA (50 mg/kg) given 24 h apart also caused marked reduction of striatal DA and DOPAC in Non-Tg mice when these substances were measured 2 weeks after the last MDMA injection. That injection schedule also caused small decreases in DA levels in the heterozygous animals but no changes in the homozygous mice; DOPAC levels were not affected in the heterozygous nor in the homozygous SOD-Tg mice. Furthermore, the multiple injection schedule caused significant decreases in DA and DOPAC in female Non-Tg mice but not in the two strains of transgenic mice. Neither the single d...Continue Reading

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Citations

Apr 28, 2004·Neurotoxicity Research·L S SeidenJ E Malberg
Apr 24, 2007·Neurotoxicity Research·Jean Lud CadetJohnalyn Lyles
Apr 15, 2004·Psychopharmacology·M Isabel ColadoA Richard Green
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