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Related Experiment Videos

Molecular interactions in human atherosclerotic plaques.

E B Smith

    The American Journal of Pathology
    |March 1, 1977
    PubMed
    Summary

    Low-density lipoprotein (LDL) and fibrin are key in atherosclerosis development. Immobilized LDL, potentially trapped by fibrin, contributes to cholesterol deposition in artery walls.

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    Area of Science:

    • Biochemistry
    • Cardiovascular Biology
    • Pathology

    Background:

    • Plasma protein concentrations in the intima correlate with molecular weight and plasma levels.
    • Low-density lipoprotein (LDL) exhibits higher retention in the intima compared to albumin.
    • Intima contains plasma proteins like fibrinogen, LDL, and protease inhibitors, along with insoluble derivatives such as cholesterol and fibrin.

    Purpose of the Study:

    • To investigate the relationship between plasma protein deposition, particularly LDL, and intimal morphology.
    • To explore the concept of "whole plasma" crossing the endothelium and the factors influencing macromolecule egress.
    • To understand the immobilization of LDL and its potential role in extracellular cholesterol deposition.

    Main Methods:

    • Analysis of plasma protein concentrations in intima relative to molecular weight and plasma levels.
    • Morphological and biochemical examination of intimal lesions (gelatinous and fibrous plaques).
    • Immunoelectrophoresis to isolate and quantify immobilized LDL, followed by enzymatic treatment (plasmin, collagenase) to release it.

    Main Results:

    • Fibrinogen and mobile LDL increase in gelatinous lesions, while fibrin and deposited cholesterol show smaller increases.
    • Fibrous plaques show significant increases in fibrin (fivefold) and cholesterol (up to thirtyfold).
    • Immobilized LDL is released by plasmin and collagenase, with release amounts correlating strongly with deposited cholesterol and insoluble fibrin levels.

    Conclusions:

    • Immobilization of LDL, potentially mediated by fibrin, appears to be an intermediate step in irreversible extracellular cholesterol deposition.
    • The balance between intact LDL/deposited cholesterol and fibrinogen/fibrin is critical in intimal pathology.
    • Understanding LDL immobilization mechanisms is crucial for elucidating atherosclerosis pathogenesis.

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