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Related Experiment Videos

Plasma-triglycerides do not regulate high-density lipoprotein concentrations

P N Herbert, L O Henderson

    Lancet (London, England)
    |June 30, 1979
    PubMed
    Summary
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    In severe familial hypertriglyceridaemia, high-density-lipoprotein (HDL) levels, specifically apolipoprotein A-I (apo A-I), were not reduced by high triglyceride levels in types 1 and 5 hyperlipoproteinaemia.

    Area of Science:

    • Lipid metabolism and cardiovascular disease research.
    • Endocrinology and clinical biochemistry.

    Background:

    • Familial hypertriglyceridaemia is characterized by significantly elevated plasma triglyceride levels.
    • High-density-lipoprotein (HDL) cholesterol is inversely associated with cardiovascular risk.
    • The relationship between hypertriglyceridaemia and HDL levels, particularly apo A-I, requires further elucidation in specific hyperlipoproteinaemia types.

    Purpose of the Study:

    • To investigate the impact of dietary interventions on plasma triglyceride fluctuations in severe familial hypertriglyceridaemia.
    • To assess high-density-lipoprotein (HDL) concentrations, measured via apolipoprotein A-I (apo A-I), in patients with type-1 and type-5 hyperlipoproteinaemia.
    • To determine the correlation between apo A-I levels and plasma lipid concentrations (cholesterol and triglycerides) in these patient groups.

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    Main Methods:

    • Induction of plasma triglyceride fluctuations using high-carbohydrate and low-fat/low-calorie diets.
    • Quantification of high-density-lipoprotein (HDL) by radioimmunoassay of apolipoprotein A-I (apo A-I).
    • Correlation analysis of apo A-I concentrations with plasma cholesterol and triglyceride levels.

    Main Results:

    • Patients with type-1 hyperlipoproteinaemia exhibited apo A-I concentrations approximately 50% of normal.
    • No significant increase in apo A-I was observed in type-1 patients even after reducing plasma triglycerides to normal levels.
    • Apo A-I concentrations in type-5 hyperlipoproteinaemia were variable and did not consistently correlate with plasma lipid levels.

    Conclusions:

    • Hypertriglyceridaemia does not appear to directly reduce HDL levels, as indicated by apo A-I concentrations, in type-1 and type-5 hyperlipoproteinaemia.
    • The findings suggest that other factors may be involved in the potential dysregulation of HDL metabolism in these conditions.
    • Further research is warranted to understand the complex interplay between genetic factors, diet, and lipid profiles in familial hypertriglyceridaemia.