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Cellular breakdown within muscular arteries in hypercholesterolemic rats.

A Reinilä

    Archives of Pathology & Laboratory Medicine
    |March 1, 1985
    PubMed
    Summary

    High-fat diets elevate cholesterol, causing cell death in rat arteries. Increased membrane cholesterol in smooth muscle cells is the likely cause of this arterial injury.

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    Area of Science:

    • Cardiovascular Science
    • Cell Biology
    • Nutritional Pathology

    Background:

    • Hypercholesterolemia is a significant risk factor for cardiovascular disease.
    • Dietary factors, particularly high-fat and cholesterol intake, are known to influence plasma lipid levels.
    • Understanding the cellular mechanisms of arterial damage in hypercholesterolemia is crucial for developing preventative strategies.

    Purpose of the Study:

    • To investigate the ultrastructural changes in muscular arteries of rats fed a high-fat, cholesterol-rich diet.
    • To determine the cellular and subcellular effects of hypercholesterolemia on arterial smooth muscle cells.
    • To explore the potential role of membrane cholesterol accumulation in diet-induced arterial injury.

    Main Methods:

    • Adult male rats were administered a high-fat, cholesterol-suppressive diet for three months.
    • Transmission electron microscopy was employed to examine the fine structure of coronary and tarsal pedis arteries.
    • Plasma cholesterol concentrations were measured at the time of sacrifice.

    Main Results:

    • Elevated plasma cholesterol concentrations were observed in the experimental group.
    • Necrotic cells were identified in the media of both coronary and tarsal pedis arteries.
    • Smooth muscle cells exhibited multivesicular membranous bodies, and intercellular spaces showed membranous material accumulation.

    Conclusions:

    • Increased membrane cholesterol concentration in smooth muscle cells is proposed as the primary cause of cellular death and membrane changes in muscular arteries during hypercholesterolemia.
    • Dietary saturated fatty acids may contribute to smooth muscle cell injury in the hypercholesterolemic state.
    • These findings highlight the detrimental effects of a high-fat, cholesterol-rich diet on arterial wall integrity at the ultrastructural level.

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