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Related Experiment Videos

Lipoproteins containing apo B extracted from human aortas. Structure and function.

H F Hoff, R E Morton

    Annals of the New York Academy of Sciences
    |January 1, 1985
    PubMed
    Summary

    Researchers isolated atherosclerotic plaque lipoproteins (A-LP) that resemble LDL but are more electronegative and contain degraded apo B. These A-LP trigger unregulated cholesterol accumulation in macrophages, potentially explaining foam cell formation in atherosclerosis.

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    Area of Science:

    • Cardiovascular Biology
    • Lipid Metabolism
    • Atherosclerosis Research

    Background:

    • Atherosclerosis is characterized by lipid accumulation within macrophages, forming foam cells.
    • Low-density lipoprotein (LDL) is implicated in atherogenesis, but its precise role in foam cell formation is complex.
    • Atherosclerotic plaques contain modified lipoproteins that may interact differently with macrophages.

    Purpose of the Study:

    • To isolate and characterize lipoproteins from human aortic atherosclerotic plaques.
    • To investigate the interaction of these plaque-derived lipoproteins with macrophages.
    • To determine the mechanism by which these lipoproteins influence macrophage lipid accumulation.

    Main Methods:

    • Isolation of apo B-containing lipoproteins from human aortic atherosclerotic plaques using anti-LDL affinity chromatography.

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  • Characterization of isolated lipoproteins (A-LP) regarding size, lipid composition, protein content, and apo B integrity.
  • Assessment of A-LP interaction with mouse peritoneal macrophages (MPM), including cholesterol esterification stimulation and binding inhibition studies.

    • Main Results:

    • A-LP fraction isolated from plaques shares similarities with plasma LDL but is larger, more electronegative, has lower protein content, and degraded apo B.
    • A-LP binds to a high-affinity site on MPM, stimulating cholesterol esterification in a dose-dependent manner.
    • A-LP-induced cholesterol esterification is unregulated, leading to foam cell formation, and the binding mechanism may differ from the scavenger receptor pathway.

    Conclusions:

    • Lipoproteins within atherosclerotic plaques (A-LP) possess distinct properties compared to plasma LDL.
    • A-LP can induce unregulated cholesterol accumulation and foam cell transformation in macrophages.
    • This interaction offers a potential mechanism for foam cell formation in early atherosclerotic lesions (fatty streaks).