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Phencyclidine-induced decrease of methionine-enkephalin levels in mouse brain

T Nabeshima, M Hiramatsu, M Amano

    European Journal of Pharmacology
    |December 24, 1982
    PubMed
    Summary
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    Acute phencyclidine (PCP) administration decreased methionine-enkephalin levels in mouse brainstem and midbrain regions. These findings suggest PCP

    Area of Science:

    • Neuroscience
    • Pharmacology
    • Neurochemistry

    Background:

    • Methionine-enkephalin is an endogenous opioid peptide involved in pain modulation and reward pathways.
    • Phencyclidine (PCP) is a dissociative anesthetic with known psychotomimetic effects.

    Purpose of the Study:

    • To investigate the impact of acute phencyclidine (PCP) administration on methionine-enkephalin levels in specific mouse brain regions.
    • To explore the potential role of enkephalinergic systems in the neurobiological mechanisms of PCP action.

    Main Methods:

    • Adult mice were administered varying doses of PCP (5-20 mg/kg).
    • Steady-state levels of methionine-enkephalin were measured in discrete brain areas post-administration using biochemical assays.

    Main Results:

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    • PCP administration significantly decreased methionine-enkephalin levels in the medulla oblongata-pons and midbrain.
    • No significant changes in methionine-enkephalin levels were observed in other brain regions examined within the tested dose range.

    Conclusions:

    • Acute PCP exposure alters enkephalinergic neurotransmission in specific brainstem and midbrain areas.
    • These alterations in methionine-enkephalin levels may contribute to the observed pharmacological and behavioral effects of PCP.