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Cholesterol synthesis and esterification in experimental xanthoma tissues

H Kodama, Y Nagao, K Arakawa

    Journal of Lipid Research
    |September 1, 1981
    PubMed
    Summary

    Cholesterol metabolism in hypercholesterolemic rabbits showed suppressed synthesis but increased esterification in xanthoma tissues. Serum fatty acids are key for cholesterol esterification, primarily via acyl-coenzyme A:cholesterol acyltransferase.

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    Area of Science:

    • Biochemistry
    • Dermatology
    • Lipid Metabolism

    Background:

    • Xanthoma tissues develop from cholesterol accumulation in skin.
    • Hypercholesterolemia is a risk factor for cardiovascular diseases.
    • Understanding cholesterol metabolism in skin lesions is crucial.

    Purpose of the Study:

    • To investigate cholesterol metabolism in experimental xanthoma tissues.
    • To compare cholesterol synthesis and esterification in hypercholesterolemic and normolipemic rabbits.
    • To identify key enzymes and fatty acid sources in cholesterol esterification.

    Main Methods:

    • Induction of experimental xanthoma in hypercholesterolemic rabbits using sodium dextran sulfate.
    • Dermal tissue analysis for cholesterol accumulation, synthesis, and esterification.

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  • Comparison with control tissues from normolipemic rabbits.

    • Main Results:

    • Significantly greater cholesterol accumulation in hypercholesterolemic rabbit xanthoma tissues.
    • Suppressed cholesterol synthesis in cholesterol-rich tissues, linked to lipoprotein uptake.
    • Enhanced cholesterol esterification, particularly with oleic acid, mediated by acyl-coenzyme A:cholesterol acyltransferase.

    Conclusions:

    • Cholesterol accumulation in xanthoma tissues is linked to suppressed synthesis and enhanced esterification.
    • Serum fatty acids are crucial for cholesterol esterification in these lesions.
    • Acyl-coenzyme A:cholesterol acyltransferase plays a primary role in cholesterol esterification in xanthoma tissues.