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Related Experiment Videos

Endogenous apoE expression modulates HDL3 binding to macrophages

C Y Lin1, M Lucas, T Mazzone

  • 1Department of Medicine, Rush Medical College, Chicago, IL 60612, USA.

Journal of Lipid Research
|March 21, 1998
PubMed
Summary
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Endogenous apolipoprotein E (apoE) expression in macrophages enhances cholesterol efflux to HDL3. While cell surface apoE influences HDL3 binding, it

Area of Science:

  • Cellular biology
  • Lipid metabolism
  • Macrophage function

Background:

  • Endogenous apolipoprotein E (apoE) expression in macrophages enhances cholesterol efflux to HDL3.
  • A cell surface pool of apoE, associated with proteoglycans, is produced by endogenous apoE expression.

Purpose of the Study:

  • To demonstrate the presence of a cell surface proteoglycan-associated apoE pool in human monocyte-derived macrophages.
  • To examine if endogenous apoE expression modulates HDL3 binding to macrophages, specifically via the cell surface pool, to account for enhanced cholesterol efflux.

Main Methods:

  • Demonstration of cell surface proteoglycan-associated apoE in human macrophages.
  • Assessment of HDL3 binding to apoE-expressing versus non-expressing macrophages at different temperatures.

Related Experiment Videos

  • Investigation of the role of secreted apoE using conditioned medium.
  • Evaluation of the impact of removing the cell surface apoE pool on HDL3 binding.
  • Measurement of cellular cholesterol mass and cholesterol efflux to HDL3.

    • Main Results:

    • Enhanced binding of apoE-free HDL3 to apoE-expressing macrophages was observed.
    • Enhanced binding was independent of secreted apoE but significantly reduced upon removal of the cell surface apoE pool.
    • Conditions reducing HDL3 binding did not substantially reduce cholesterol efflux to HDL3.

    Conclusions:

    • A cell surface pool of apoE plays a role in modulating HDL3 interaction with macrophages.
    • Enhanced HDL3 binding due to cell surface apoE is not the primary mechanism driving increased cholesterol efflux to HDL3 from endogenous apoE-expressing macrophages.