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Related Experiment Videos

The binding of gitoxin to human plasma proteins.

N Verbeke, P Pellegrin, A Vienne

    European Journal of Clinical Pharmacology
    |November 1, 1979
    PubMed
    Summary

    Gitoxin, digitoxin, and digoxin bind to human plasma proteins. Albumin showed similar affinity for these cardiac glycosides, with gitoxin binding exclusively to albumin in plasma.

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    Area of Science:

    • Pharmacology
    • Biochemistry
    • Clinical Chemistry

    Background:

    • Cardiac glycosides like digoxin are crucial for treating heart failure.
    • Understanding their protein binding is vital for therapeutic efficacy and safety.
    • Previous studies have established protein binding for some cardiac glycosides.

    Purpose of the Study:

    • To quantify the plasma protein binding of gitoxin, digitoxin, and digoxin.
    • To compare the binding affinities of these cardiac glycosides to human plasma proteins, particularly albumin.
    • To identify which plasma proteins bind to gitoxin.

    Main Methods:

    • Ultracentrifugation was employed to assess protein binding.
    • Equilibrium dialysis was utilized to determine binding constants.
    • Purified human albumin was used to evaluate specific binding interactions.

    Main Results:

    • Protein binding percentages at therapeutic levels were 85% for gitoxin, 92% for digitoxin, and 20% for digoxin.
    • Human albumin demonstrated comparable affinity for all three tested cardiac glycosides.
    • Gitoxin was found to bind exclusively to albumin in human plasma; no other proteins showed binding.

    Conclusions:

    • Gitoxin, digitoxin, and digoxin exhibit varying degrees of plasma protein binding.
    • Human albumin is a primary binding protein for these cardiac glycosides.
    • The exclusive binding of gitoxin to albumin warrants further investigation in clinical contexts.

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