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Plasma cholesterol esterifying activity in guinea pigs

R Ostwald, M Green, M Meng

    Nutrition and Metabolism
    |January 1, 1979
    PubMed
    Summary
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    Dietary cholesterol did not alter plasma cholesterol esterification in guinea pigs. However, it increased lecithin-cholesterol acyltransferase (LCAT) activity, suggesting issues with substrate suitability or cofactor availability.

    Area of Science:

    • Biochemistry
    • Lipid Metabolism
    • Comparative Physiology

    Background:

    • Plasma cholesterol esterification is a key process in reverse cholesterol transport.
    • Lecithin-cholesterol acyltransferase (LCAT) is the primary enzyme responsible for this activity.
    • Understanding LCAT regulation is crucial for managing cholesterol homeostasis.

    Purpose of the Study:

    • To investigate the effect of dietary cholesterol on plasma cholesterol esterifying activity in guinea pigs.
    • To compare LCAT activity and substrate suitability between control and cholesterol-fed guinea pigs.
    • To explore potential limitations in guinea pig LCAT function.

    Main Methods:

    • Guinea pigs were fed either a control diet or a diet supplemented with 1% cholesterol.

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  • Plasma cholesterol esterifying activity was measured.
  • LCAT activity was assessed using autologous plasma as substrate.
  • Heat treatment was used to assess substrate availability.

    • Main Results:

    • Dietary cholesterol did not significantly alter the overall extent or initial rate of plasma cholesterol esterification in guinea pigs.
    • LCAT activity was significantly higher in cholesterol-fed guinea pigs compared to controls.
    • LCAT activity was unaffected by dietary cholesterol when using autologous plasma but increased when using heterologous substrates.
    • Heat treatment affected substrate availability differently in control and cholesterol-fed groups.

    Conclusions:

    • Dietary cholesterol appears to increase the amount or activity of LCAT in guinea pigs.
    • The esterification process may be limited by substrate suitability or cofactor availability in cholesterol-fed guinea pigs.
    • Further research is needed to elucidate the substrate specificity and cofactor requirements of guinea pig LCAT.