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Related Experiment Videos

Protein binding of propisomide.

R Zini, J Barre, G Defer

    Journal of Pharmaceutical Sciences
    |May 1, 1985
    PubMed
    Summary

    Propisomide exclusively binds to alpha1-acid glycoprotein in human serum with high affinity. This protein binding is saturable, affecting the unbound drug fraction, and equilibrium dialysis is the reliable method for its determination.

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    Area of Science:

    • Pharmacokinetics
    • Biochemistry
    • Drug Metabolism

    Background:

    • Understanding drug-protein interactions is crucial for predicting drug efficacy and toxicity.
    • Alpha1-acid glycoprotein (AAG) is a key plasma protein involved in binding many drugs.
    • Propisomide's binding characteristics to human serum proteins require detailed investigation.

    Purpose of the Study:

    • To characterize the protein binding of propisomide in human serum.
    • To identify the specific plasma protein(s) responsible for propisomide binding.
    • To compare the reliability of equilibrium dialysis and ultrafiltration methods for determining propisomide's unbound fraction.

    Main Methods:

    • Equilibrium dialysis was employed to assess propisomide binding to human serum and isolated proteins.
    • Saturation kinetics were analyzed to determine binding affinity and capacity.
    • Two ultrafiltration techniques were evaluated against equilibrium dialysis.

    Main Results:

    • Propisomide exhibits exclusive and high-affinity binding to alpha1-acid glycoprotein (AAG).
    • The binding is saturable, leading to a variable unbound fraction (0.05–0.60) dependent on serum concentration.
    • High concentrations of AAG-binding drug metabolites or other drugs can displace propisomide.
    • Ultrafiltration methods yielded unreliable results for propisomide serum protein binding.

    Conclusions:

    • Alpha1-acid glycoprotein is the primary determinant of propisomide's serum protein binding.
    • Equilibrium dialysis is confirmed as an accurate and reliable method for quantifying the unbound fraction of propisomide.
    • Understanding these binding dynamics is essential for propisomide's clinical application and pharmacokinetic profiling.

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