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Lipid diffusibility in the intact erythrocyte membrane.

J A Bloom, W W Webb

    Biophysical Journal
    |June 1, 1983
    PubMed
    Summary

    Lateral diffusion of fluorescent lipids in erythrocyte membranes was measured using fluorescence photobleaching recovery. Species, temperature, and hypercholesterolemia affect lipid mobility, but not calcium or spectrin levels.

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    Area of Science:

    • Membrane biophysics
    • Cellular dynamics

    Background:

    • The plasma membrane's fluidity is crucial for cellular functions.
    • Understanding lipid diffusion in erythrocytes provides insights into membrane properties.

    Purpose of the Study:

    • To quantify lateral diffusion of lipid analogues in intact erythrocytes across various species.
    • To investigate the influence of factors like temperature, species, age, and pathological conditions on lipid diffusion.

    Main Methods:

    • Utilized fluorescence photobleaching recovery (FPR) to measure lateral diffusion coefficients (D).
    • Employed fluorescent lipid analogues, specifically 3,3'-dioctadecylindodicarbocyanine iodide (DiI[5]) and rhodamine-B phosphatidylethanolamine (RBPE).
    • Compared diffusion in intact erythrocytes from humans, mice, rabbits, and frogs, including various mutant and induced conditions.

    Main Results:

    • Lateral diffusion coefficients varied significantly with temperature (1-42°C) and between species.
    • RBPE showed approximately twice the diffusion constant of DiI[5].
    • Dietary hypercholesterolemia in rabbits reduced diffusion and altered Arrhenius plot characteristics, unlike in frogs.

    Conclusions:

    • Lipid diffusion in erythrocytes is species- and temperature-dependent.
    • Hypercholesterolemia significantly impacts erythrocyte membrane lipid mobility.
    • Factors like calcium and spectrin levels do not appear to perturb lateral lipid diffusion in intact cells.

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