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Related Experiment Videos

Decrease in reactive amino groups during oxidation or endothelial cell modification of LDL. Correlation with changes

U P Steinbrecher, J L Witztum, S Parthasarathy

    Arteriosclerosis (Dallas, Tex.)
    |March 1, 1987
    PubMed
    Summary
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    Oxidation of low-density lipoprotein (LDL) transforms it into a form rapidly taken up by macrophages, contributing to foam cell formation in atherosclerosis. This LDL oxidation process, accelerated by endothelial cells, is key to cholesterol accumulation.

    Area of Science:

    • Biochemistry
    • Cell Biology
    • Cardiovascular Research

    Background:

    • Monocytes/macrophages are precursors to lipid-laden foam cells in atherosclerotic lesions.
    • The mechanism of cholesterol accumulation in macrophages, leading to foam cell formation, is not fully understood.
    • Endothelial cells can modify low-density lipoprotein (LDL) for enhanced macrophage uptake via the acetyl LDL receptor.

    Purpose of the Study:

    • To elucidate the mechanism by which macrophages accumulate cholesterol to become foam cells.
    • To determine if LDL oxidation is responsible for the modification induced by endothelial cells.
    • To characterize the physicochemical changes in LDL during oxidation and their biological consequences.

    Main Methods:

    • Oxidation of LDL using copper ions (Cu++) and by cultured endothelial cells.

    Related Experiment Videos

  • Analysis of physicochemical properties of modified LDL, including electrophoretic mobility, density, and lipid/protein composition.
  • Assessment of amino group reactivity and apolipoprotein B fragmentation.
  • In vivo catabolism studies of oxidized LDL in guinea pigs.

    • Main Results:

    • Copper-induced LDL oxidation produced modifications indistinguishable from those induced by endothelial cells.
    • LDL oxidation significantly decreased amino group reactivity, facilitating recognition by the acetyl LDL receptor.
    • Oxidized LDL was rapidly catabolized in vivo, primarily by the liver (over 80% degradation).

    Conclusions:

    • Endothelial cell-mediated modification of LDL is attributable to LDL oxidation.
    • Oxidation is the primary driver of LDL modification leading to enhanced macrophage uptake and foam cell formation.
    • Endothelial cells can accelerate LDL oxidation, promoting the early stages of atherosclerosis.