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Related Experiment Videos

3H-Ouabain binding to human mononuclear leucocytes.

K Ludwig, L Brown, E Erdmann

    Klinische Wochenschrift
    |October 15, 1985
    PubMed
    Summary

    Human mononuclear leucocytes bind 3H-ouabain similarly to heart muscle, but large variations in binding sites make them unsuitable for drug studies.

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    Area of Science:

    • Pharmacology
    • Cell Biology
    • Biochemistry

    Background:

    • Cardiac glycosides are crucial drugs affecting heart muscle function.
    • Understanding cardiac glycoside binding is vital for therapeutic applications and disease monitoring.
    • Human blood cells offer a potential model for studying these binding dynamics.

    Purpose of the Study:

    • To investigate 3H-ouabain binding to intact human mononuclear leucocytes.
    • To compare the binding characteristics with those of human heart muscle.
    • To assess the suitability of leucocytes as a model for physiological or disease-induced changes in cardiac glycoside binding.

    Main Methods:

    • Incubation of leucocyte suspensions from normal subjects with 3H-ouabain.
    • Quantification of 3H-ouabain binding using radioligand assay.
    • Analysis of binding affinity (KD), association (k+1), and dissociation (k-1) rates.
    • Determination of the number of ouabain binding sites per leucocyte.

    Main Results:

    • 3H-ouabain exhibited specific binding to a single type of site on mononuclear leucocytes.
    • The affinity (KD) of binding was comparable to that observed in human heart muscle.
    • Binding association and dissociation rates were slow.
    • Significant inter- and intra-individual variations in the number of binding sites were observed.

    Conclusions:

    • The ouabain binding site on human heart muscle is likely identical to that on intact mononuclear leucocytes.
    • Despite similar binding affinity, the substantial variability in binding site number within leucocyte mixtures limits their use for quantifying drug- or disease-induced changes.

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