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Related Experiment Videos

Dynamic and stable pools of apoE differ functionally at the HepG2 cell surface.

J W Burgess1, Y L Marcel

  • 1Lipoprotein and Atherosclerosis Group, University of Ottawa Heart Institute, 40 Ruskin Street, Ottawa, Ontario, Canada K1Y 4W7.

Journal of Lipid Research
|August 24, 2001
PubMed
Summary

Cell surface apolipoprotein E (apoE) has dynamic and stable pools. Dynamic apoE can transfer to lipoproteins, while stable apoE on the extracellular matrix may prevent unproductive lipoprotein binding.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Lipid Metabolism

Background:

  • Hepatocytes synthesize apolipoprotein E (apoE), which is found in both secreted and cell-surface pools.
  • The role of cell-surface apoE in lipoprotein metabolism and extracellular interactions is not fully understood.

Purpose of the Study:

  • To investigate the dynamics of cell surface apoE and its role in lipoprotein binding.
  • To elucidate the interaction between cell surface apoE, extracellular matrix (ECM), and lipoprotein uptake.

Main Methods:

  • HepG2 cells were treated with Brefeldin A to assess dynamic cell surface apoE pools.
  • Solid-phase assays were used to study apoE binding to heparan sulfate proteoglycans.
  • Suramin was employed to reduce cell surface apoE levels and observe effects on lipoprotein secretion.

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Main Results:

  • A dynamic pool of cell surface apoE with a short half-life (15 min) was identified, alongside a stable ECM-associated pool (t(1/2) > 20 h).
  • Increased ECM-bound apoE correlated with decreased VLDL binding, while decreased cell surface apoE enhanced VLDL binding.
  • Inhibition of cell surface apoE reduced apoE content on secreted apoB-lipoproteins without altering overall apoE or apoB secretion.

Conclusions:

  • Cell surface apoE exists in distinct dynamic and stable fractions.
  • Dynamic apoE can be transferred to newly secreted lipoproteins.
  • Stable, ECM-bound apoE may regulate lipoprotein interactions by modulating binding site availability.