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• W2000278712 abstract "Drug discrimination studies have suggested that the subjective effects of low doses of (±)3,4-methylenedioxymethamphetamine (MDMA) are readily differentiated from those of d-amphetamine (AMPH) and that the discriminative stimulus properties are mediated by serotonergic and dopaminergic mechanisms, respectively. Previous studies, however, have primarily examined responses to doses that do not produce substantial increases in extracellular dopamine. The present study determined whether doses of MDMA that produce increases in synaptic dopamine would also produce subjective effects that were more like AMPH and were sensitive to pharmacological manipulation of D1-like receptors. A three-lever drug discrimination paradigm was used. Rats were trained to respond on different levers following saline, AMPH (0.5 mg/kg, IP) or MDMA (1.5 mg/kg, IP) injections. Generalization curves were generated for a range of different doses of both drugs and the effect of the D1-like antagonist, SCH23390 on the discriminative stimulus effects of different doses of MDMA was determined. Rats accurately discriminated MDMA, AMPH and saline. Low doses of MDMA produced almost exclusive responding on the MDMA lever but at doses of 3.0 mg/kg MDMA or higher, responding shifted to the AMPH lever. The AMPH response produced by higher doses of MDMA was attenuated by pretreatment with SCH23390. The data suggest that low doses and higher doses of MDMA produce distinct discriminative stimuli. The shift to AMPH-like responding following administration of higher doses of MDMA, and the decrease in this response following administration of SCH23390 suggests a dopaminergic component to the subjective experience of MDMA at higher doses." @default.
• W2000278712 created "2016-06-24" @default.
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• W2000278712 date "2014-01-01" @default.
• W2000278712 modified "2023-10-16" @default.
• W2000278712 title "A 3-lever discrimination procedure reveals differences in the subjective effects of low and high doses of MDMA" @default.
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• W2000278712 doi "https://doi.org/10.1016/j.pbb.2013.11.011" @default.
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