Abstract
The study investigated the interaction between phencyclidine (PCP) and morphine in affecting the levels of met-enkephalin, dopamine, DOPAC and HVA in mice. Morphine 5 mg/kg alone and PCP 10 mg/kg alone failed to change the levels of met-enkephalin in the midbrain and striatum. However, PCP in combination with morphine produced an increase in met-enkephalin levels and a decrease in HVA levels. In the midbrain, there was a direct relationship between the decrease in met-enkephalin levels and the increase in HVA levels. These results suggest that PCP may change the function in dopaminergic and enkephalinergic neuronal systems in the midbrain and/or striatum.
Published Version
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