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Related Experiment Videos

Chronic proglumide increases [3H]spiperone binding in the rat brain.

A J Bean, W J Baldy, G E Martin

    European Journal of Pharmacology
    |October 29, 1985
    PubMed
    Summary

    Chronic administration of proglumide, a cholecystokinin (CCK) antagonist, significantly increased dopamine D-2 receptor binding sites in rats. This suggests long-term proglumide use may alter dopamine receptor density.

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    Area of Science:

    • Neuropharmacology
    • Dopamine Receptor Research

    Background:

    • Cholecystokinin (CCK) antagonists are investigated for their potential neurological effects.
    • Dopamine D-2 receptors play a crucial role in various brain functions and are targets for several therapeutic agents.

    Purpose of the Study:

    • To investigate the effect of chronic proglumide administration on dopamine D-2 receptor binding in the rat striatum.
    • To determine if proglumide alters the number (Bmax) or affinity (Kd) of [3H]spiperone binding sites.

    Main Methods:

    • Rats were administered proglumide chronically (14 days) via osmotic mini-pumps at doses of 41.0-53.5 mg/kg/day.
    • Striatal tissue was analyzed for [3H]spiperone binding to assess receptor density and affinity.
    • Control groups received lower doses chronically or acute injections of proglumide.

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    Main Results:

    • Chronic administration of proglumide at high doses (41.0-53.5 mg/kg/day) resulted in a significant 13% increase in [3H]spiperone binding site density (Bmax).
    • No significant changes in the affinity (Kd) of [3H]spiperone for these binding sites were observed.
    • Lower chronic doses and acute proglumide administration did not affect [3H]spiperone binding.

    Conclusions:

    • Long-term, high-dose proglumide administration upregulates dopamine D-2 receptors in the rat striatum.
    • The observed increase in binding sites suggests a potential mechanism for proglumide's effects on dopaminergic neurotransmission.
    • These findings highlight the impact of chronic CCK antagonist treatment on dopamine receptor regulation.