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Specific binding sites for D-alpha-tocopherol on human erythrocytes

A E Kitabchi, J Wimalasena

    Biochimica Et Biophysica Acta
    |January 22, 1982
    PubMed
    Summary

    Human red blood cells possess specific binding sites for vitamin E (tocopherol), acting as receptors. These sites, partly protein-based, have varying affinities and capacities, influencing vitamin E uptake and cellular protection.

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    Area of Science:

    • Biochemistry
    • Cell Biology
    • Hematology

    Background:

    • Vitamin E deficiency increases erythrocyte susceptibility to hemolysis.
    • Understanding vitamin E transport is crucial for red blood cell health.

    Purpose of the Study:

    • To investigate the presence and characteristics of tocopherol binding sites in human erythrocytes.
    • To elucidate the nature of these binding sites and their role in vitamin E uptake.

    Main Methods:

    • Incubation of human erythrocytes with radiolabeled D-alpha-tocopherol.
    • Kinetic analysis of tocopherol binding to erythrocyte membranes.
    • Characterization of binding site affinity and capacity.

    Main Results:

    • Human erythrocytes exhibit specific binding sites for D-alpha-tocopherol.
    • Two distinct binding sites were identified: high-affinity/low-capacity and low-affinity/high-capacity.
    • These binding sites are at least partially proteinaceous in nature.

    Conclusions:

    • Erythrocytes possess receptor-like structures for vitamin E.
    • These findings suggest a mechanism for vitamin E incorporation into red blood cells.
    • Further research into these sites could inform strategies against oxidative stress in erythrocytes.

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