Abstract
Pretreatment with multiple methamphetamine injections prior to a high-dose methamphetamine challenge administration can attenuate long-term deficits in striatal and hippocampal serotonin content caused by the stimulant. The present data extend previous findings by demonstrating that rats pretreated with escalating doses methamphetamine did not exhibit dopamine deficits in the striatum, nor serotonin deficits in striatal, frontal cortical, or hippocampal tissues, 7 days after a challenge methamphetamine administration. This protection was not due to attenuation of methamphetamine-induced hyperthermia or altered brain methamphetamine concentrations. These data differ from previous findings thereby highlighting that different mechanisms contribute to the tolerance of the neurotoxic effects.
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