Multiple high-dose administrations of the dopamine-releasing agent, methamphetamine, rapidly and persistently decrease vesicular dopamine uptake in purified vesicles prepared from striata of treated rats. Because important differences in the neurotoxic effects of stimulants have been documented in rats and mice, the purpose of this study was to determine if methamphetamine-induced effects in rats occur in mice and to elucidate mechanisms underlying these effects. Results reveal methamphetamine treatment rapidly decreased mouse striatal vesicular dopamine uptake; a phenomenon associated with a subcellular redistribution of vesicular monoamine transporter-2 (VMAT-2) immunoreactivity. Both methamphetamine-induced hyperthermia and dopamine D2 receptor activation contributed to the stimulant-induced deficits in vesicular dopamine uptake. Unlike methamphetamine, the dopamine reuptake inhibitors, methylphenidate and cocaine, rapidly increased vesicular dopamine uptake. The implications of these phenomena are discussed.
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