3,4-Methylenedioxymethamphetamine, mephedrone, and β-phenylethylamine release dopamine from the cytoplasm by means of transporters and keep the concentration high and constant by blocking reuptake

European Journal of Pharmacology
Gabriella ZsillaE S Vizi

Abstract

The addiction-related behavioural effects of drugs of abuse are mediated by the mesocorticolimbic monoamine systems. We investigated the effects of 3,4-methylenedioxymethamphetamine (MDMA), mephedrone, β-phenylethylamine (β-PEA) methylphenidate (MPH) on dopamine release from mouse perfused nucleus accumbens and prefrontal cortex slices. The fractional release of [3H]-dopamine was measured at rest and in response to field stimulation. The distributions of [3H]-dopamine and its metabolites were determined using high-pressure liquid chromatography. The effect of drugs on [3H]-dopamine uptake was measured in synaptosomal P2 preparations from the frontal cortex and striatum. Similar to MDMA, mephedrone β-PEA increased the resting release of [3H]-dopamine from the nucleus accumbens and prefrontal cortex in a [Ca2+]o-independent manner, and the stimulation-evoked release was also augmented. In contrast, MPH failed to affect the resting release but potentiated the release in response to axonal activity. Similar to dopamine transporter antagonist GBR 12909, mephedrone, MDMA and MPH biphasically inhibited the [3H]-dopamine uptake. The administration of GBR 12909 and nisoxetine, or lowering the bath temperature prevented MDMA, mephedrone ...Continue Reading

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