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Related Experiment Videos

Interaction between phloretin and the red blood cell membrane.

M L Jennings, A K Solomon

    The Journal of General Physiology
    |April 1, 1976
    PubMed
    Summary

    Phloretin primarily binds to hemoglobin in red blood cells. High-affinity binding sites are on membrane proteins, while low-affinity sites involve lipids, distinguishing phloretin

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    Area of Science:

    • Biochemistry
    • Membrane Biology
    • Pharmacology

    Background:

    • Phloretin is a flavonoid with known biological activities.
    • Understanding phloretin's interaction with red blood cells is crucial for its pharmacological applications.
    • Red blood cells offer a model system to study drug interactions with cellular components.

    Purpose of the Study:

    • To characterize the binding of phloretin to red blood cell components.
    • To determine the contribution of hemoglobin and membrane structures to phloretin binding.
    • To elucidate the nature of phloretin binding sites within the red blood cell.

    Main Methods:

    • Binding assays using intact red blood cells, purified hemoglobin, and red cell ghosts.
    • Measurement of phloretin uptake kinetics to determine membrane permeability.
    • Analysis of phloretin binding to lipid extracts from red cell ghosts.

    Main Results:

    • Phloretin binding is maximal at pH 6 and primarily occurs with hemoglobin.
    • Red cell membrane permeability to phloretin is rapid, with a permeability coefficient of 2 x 10(-4) cm/s.
    • Two types of binding sites were identified on red cell ghosts: high-affinity (protein-related) and low-affinity (lipid-related).

    Conclusions:

    • Hemoglobin accounts for the majority of non-saturable phloretin binding to red blood cells.
    • High-affinity phloretin binding is associated with membrane proteins, while low-affinity binding involves the lipid bilayer.
    • This distinction allows for differentiating phloretin's effects on membrane proteins versus the lipid environment.

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