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Repeated periods of maternal separation in the early life of rats decreased dopamine transporter expression and significantly increased dopamine responses to stress, and behavioral responses to either stress or cocaine. As adults, maternal separation animals showed increased sensitivity to the effects of cocaine on locomotor activity and greater sensitivity to stress-induced sensitization to the effects...
The effects of repeated footshock stress or cocaine on the kinetics of dopamine clearance in the medial prefrontal cortex (mPFC) were measured by rotating disk electrode voltammetry (RDEV). Five groups of rats were used: animals were either naive (non-handled), pre-treated with five daily saline (1 ml/kg i.p.) or cocaine (15 mg/kg i.p.) injections, or pre-treated with five daily 20-min sessions of...
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