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Related Experiment Videos

Cholesteryl ester transfer activity in plasma measured by using solid-phase-bound high-density lipoprotein.

D L Sparks, J Frohlich, P Cullis

    Clinical Chemistry
    |March 1, 1987
    PubMed
    Summary
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    Plasma lipid-transfer factors facilitate cholesteryl ester movement from high-density lipoprotein (HDL) to other lipoproteins. This study quanties this transfer process, finding it dependent on plasma and lipid-transfer protein levels.

    Area of Science:

    • Biochemistry
    • Lipid Metabolism
    • Cardiovascular Research

    Background:

    • Lipid transfer proteins (LTPs) in plasma play a crucial role in lipoprotein metabolism.
    • Understanding the efficiency and regulation of cholesteryl ester transfer is vital for cardiovascular health research.

    Purpose of the Study:

    • To quantify the ability of plasma lipid-transfer factors to move cholesteryl ester from high-density lipoprotein (HDL) to other lipoproteins.
    • To investigate the dependence of this transfer process on plasma concentration, lipid-transfer protein, and donor/acceptor lipoprotein levels.

    Main Methods:

    • Utilized [3H]cholesteryl ester covalently bound to Sepharose 4B beads as a donor system for high-density lipoprotein (HDL).
    • Incubated HDL-bound [3H]cholesteryl ester with plasma for 2 hours at 37°C.

    Related Experiment Videos

  • Measured the percentage and distribution of transferred [3H]cholesteryl ester among plasma lipoproteins, including HDL, low-density lipoproteins (LDL), and very-low-density lipoproteins (VLDL).

    • Main Results:

    • 12-14% of [3H]cholesteryl ester was transferred to plasma lipoproteins within 2 hours.
    • Transferred cholesteryl ester distributed as 57% to HDL and 43% to LDL/VLDL.
    • The transfer process demonstrated dependence on plasma volume and was enhanced by purified lipid-transfer protein, with dependency on HDL concentration but independence from acceptor lipoprotein amount.

    Conclusions:

    • Developed a straightforward method to evaluate cholesteryl ester transfer without pre-lipoprotein removal.
    • Confirmed the role of plasma lipid-transfer factors in mediating cholesteryl ester exchange between lipoproteins.
    • The findings provide insights into the dynamics of lipid transport and potential therapeutic targets in lipoprotein disorders.