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Related Experiment Videos

Receptors for morphine and opioids.

E Sánchez, L Tampier, J Mardones

    General Pharmacology
    |August 1, 1976
    PubMed
    Summary

    This study reveals at least two glucuronyltransferases in rat organs and demonstrates nalorphine

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    Area of Science:

    • Pharmacology
    • Biochemistry
    • Enzymology

    Background:

    • Morphine metabolism is crucial for its efficacy and toxicity.
    • Understanding the enzymes involved, like glucuronyltransferase and those in N-demethylation, is key to drug interaction studies.

    Purpose of the Study:

    • To investigate the multiplicity of glucuronyltransferase enzymes involved in morphine metabolism.
    • To determine the effect of nalorphine on the N-demethylation of morphine.

    Main Methods:

    • Differential distribution of glucuronizing activity for morphine and rho-nitrophenol across rat liver, kidney, and intestine microsomes.
    • Enzyme induction studies using phenobarbital and 3-methylcholantrene.
    • Chromatographic separation of enzymatic fractions.
    • In vitro assays of morphine N-demethylation in rat liver homogenates with varying nalorphine concentrations.

    Main Results:

    • Evidence suggests at least two distinct glucuronyltransferases in rat liver, kidney, and intestine microsomes.
    • Differential substrate specificity and inducibility by xenobiotics (phenobarbital, 3-methylcholantrene) support enzyme multiplicity.
    • Nalorphine exhibited a dose-dependent effect on morphine N-demethylation, inhibiting at higher concentrations and enhancing at a lower concentration.

    Conclusions:

    • Rat liver, kidney, and intestine possess multiple forms of glucuronyltransferase with distinct substrate specificities.
    • Nalorphine's complex interaction with morphine N-demethylation pathways warrants further investigation for clinical implications.

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