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Related Experiment Videos

Receptor-mediated low-density lipoprotein catabolism.

F A Spengel, G R Thompson

    Klinische Wochenschrift
    |April 1, 1982
    PubMed
    Summary

    Low-density lipoprotein (LDL) receptors are crucial for cholesterol regulation. Their absence in familial hypercholesterolaemia patients highlights the role of hepatic LDL receptors in maintaining cholesterol homeostasis.

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    Area of Science:

    • Biochemistry
    • Genetics
    • Metabolic Diseases

    Background:

    • Low-density lipoprotein (LDL) receptors are present in normal fibroblasts but reduced or absent in familial hypercholesterolaemia (FH).
    • Understanding the role of LDL receptors in vivo is critical for FH pathogenesis.

    Purpose of the Study:

    • To investigate the role of receptor-mediated LDL catabolism in vivo.
    • To explore the function of hepatic LDL receptors in cholesterol homeostasis.
    • To determine the impact of absent hepatic LDL receptors on FH.

    Main Methods:

    • Quantified in vivo receptor-mediated LDL catabolism using radiolabeled LDL turnover rates.
    • Assessed the effect of bile acid synthesis-promoting measures (anion-exchange resins, ileal bypass) on LDL catabolism.
    • Examined LDL binding to liver cell membranes in canine models.

    Main Results:

    • Receptor-mediated catabolism accounts for ~1/3 of total LDL catabolism in normal subjects, <1/5 in FH heterozygotes, and is absent in FH homozygotes.
    • Stimulating bile acid synthesis increased receptor-mediated catabolism in normal subjects and FH heterozygotes.
    • These measures enhanced LDL binding to liver cell membranes in dogs.

    Conclusions:

    • Hepatic LDL receptors exist and are vital for maintaining hepatocyte cholesterol homeostasis.
    • Partial or complete absence of hepatic LDL receptors is implicated in the pathogenesis of familial hypercholesterolaemia.

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