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3H-Codeine binding in the guinea pig lower brain stem.

T T Chau, F E Carter, L S Harris

    Pharmacology
    |January 1, 1982
    PubMed
    Summary
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    Researchers identified specific opiate receptors in guinea pig medulla that bind codeine. These receptors are less sensitive to naloxone and stereoselective than mu receptors, suggesting a distinct class for antitussive effects.

    Area of Science:

    • Neuroscience
    • Pharmacology

    Background:

    • Opiate receptors are crucial targets for pain management and other therapeutic applications.
    • Understanding the subtypes and characteristics of opiate receptors is essential for developing targeted therapeutics.

    Purpose of the Study:

    • To investigate the binding characteristics of codeine in the guinea pig medulla.
    • To explore the potential existence of distinct opiate receptor subtypes involved in antitussive effects.

    Main Methods:

    • Radioligand binding assays using (-)-3H codeine in guinea pig medulla homogenates.
    • Displacement studies with various opiate agonists and antagonists.
    • Analysis of binding affinity (KD) and receptor density (Bmax).

    Main Results:

    Related Experiment Videos

    • Saturable binding of (-)-3H codeine was observed in the guinea pig medulla.
    • Binding was stereoselective and influenced by Na+ and Mg++ ions.
    • Codeine binding was displaced by other opiates but not barbiturates.
    • Naloxone showed only 40% inhibition at high concentrations, indicating reduced sensitivity.

    Conclusions:

    • The findings suggest the presence of a distinct class of opiate antitussive receptors in the guinea pig medulla.
    • These receptors exhibit lower naloxone sensitivity and stereoselectivity compared to mu receptors.
    • This implicates a novel receptor population potentially mediating antitussive actions of codeine.