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Lipoproteins and atherosclerosis.

J Babiak, L L Rudel

    Bailliere'S Clinical Endocrinology and Metabolism
    |August 1, 1987
    PubMed
    Summary

    Plasma lipoproteins like LDL and HDL are crucial for cholesterol transport. Imbalances, such as high LDL or low HDL, can lead to cholesterol buildup, increasing atherosclerosis risk.

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    Area of Science:

    • Lipid metabolism and cardiovascular disease research.

    Background:

    • Plasma lipoproteins, including LDL and HDL, are essential for cholesterol transport between tissues and the liver.
    • Dysregulation of cholesterol transport, characterized by elevated LDL or reduced HDL, can lead to cholesterol accumulation in peripheral tissues.
    • Altered LDL particle characteristics (number, size, composition) and HDL function are implicated in atherosclerosis and coronary heart disease (CHD).

    Purpose of the Study:

    • To explore the roles of different lipoproteins in cholesterol homeostasis.
    • To investigate the relationship between lipoprotein metabolism, particle characteristics, and the risk of atherosclerosis and CHD.
    • To understand the mechanisms by which HDL may be protective against atherosclerosis.

    Main Methods:

    • The study reviews existing knowledge on lipoprotein metabolism, focusing on LDL and HDL pathways.
    • It discusses the impact of alterations in LDL metabolism, such as receptor activity and VLDL production, on plasma LDL characteristics.
    • The role of HDL in reverse cholesterol transport and its association with atherosclerosis risk is examined.

    Main Results:

    • Deviations in cholesterol transport balance, particularly increased LDL or decreased HDL, can result in extrahepatic cholesterol accumulation.
    • Increased LDL particle number, altered LDL size, and changes in LDL composition are associated with elevated atherosclerosis and CHD risk.
    • In nonhuman primates, large LDL particles, rich in saturated cholesteryl esters, are linked to increased CHD risk, potentially by affecting interactions with cellular components.

    Conclusions:

    • Changes in LDL particle number, size, and composition are likely contributors to atherosclerosis progression.
    • HDL's protective role against atherosclerosis is attributed to reverse cholesterol transport, where HDL removes cholesterol from tissues.
    • Increased plasma HDL cholesterol concentration generally suggests enhanced cholesterol removal from tissues, potentially reducing atherosclerosis risk.

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