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Related Experiment Videos

Lipid organization in erythrocyte membrane microvesicles.

S Scott, S A Pendlebury, C Green

    The Biochemical Journal
    |November 15, 1984
    PubMed
    Summary

    Microvesicle membranes, derived from red blood cells, exhibit more random phospholipid distribution compared to erythrocyte membranes. Cholesterol distribution remains unchanged during microvesicle formation.

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    Area of Science:

    • Biochemistry
    • Cell Biology
    • Membrane Biophysics

    Background:

    • Human erythrocytes release microvesicles during storage or preparation.
    • The membrane composition and organization of these microvesicles differ from intact erythrocytes.

    Purpose of the Study:

    • To investigate the accessibility of aminophospholipids in erythrocyte-derived microvesicles.
    • To determine the distribution and accessibility of cholesterol within microvesicle membranes.

    Main Methods:

    • Chemical labeling with 2,4,6-trinitrobenzenesulphonic acid to assess aminophospholipid accessibility.
    • Enzymatic digestion using phospholipase A2.
    • Filipin-binding assays to probe cholesterol accessibility in sealed and unsealed membranes.

    Main Results:

    • Aminophospholipids in microvesicles are more accessible to chemical agents than in intact erythrocytes, suggesting random distribution.
    • Phospholipids in microvesicles are also susceptible to phospholipase A2, unlike those in erythrocytes.
    • Cholesterol accessibility in microvesicles indicates no preferential transfer across the bilayer during formation.

    Conclusions:

    • Microvesicle membranes possess a more randomized phospholipid asymmetry compared to erythrocyte membranes.
    • Cholesterol distribution is not significantly altered during the process of microvesicle formation from erythrocyte ghosts.

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