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Macrophage lipoprotein receptors.

A M Fogelman1, B J Van Lenten, C Warden

  • 1Department of Medicine, School of Medicine, University of California, Los Angeles 90024-1679.

Journal of Cell Science. Supplement
|January 1, 1988
PubMed
Summary

Macrophages internalize lipoproteins via various receptors, some of which are unregulated, leading to cholesterol accumulation and arterial foam cell formation.

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Area of Science:

  • Cell Biology
  • Atherosclerosis Research
  • Lipid Metabolism

Background:

  • Macrophages play a crucial role in lipoprotein uptake.
  • Dysregulated lipoprotein internalization contributes to arterial foam cell formation.
  • Several macrophage surface receptors mediate lipoprotein entry.

Purpose of the Study:

  • To investigate the mechanisms of lipoprotein internalization by macrophages.
  • To identify specific receptors involved in cholesterol accumulation.
  • To understand pathways leading to arterial foam cell formation.

Main Methods:

  • Characterization of low-density lipoprotein (LDL) receptor regulation in human monocyte macrophages and J774 macrophages.
  • Analysis of beta migrating very low density lipoprotein (beta-VLDL) receptor and scavenger receptor activity.
  • Investigation of lipoprotein complexes uptake by macrophages.

Main Results:

  • Human monocyte macrophages exhibit regulated LDL receptor activity, while J774 macrophages show defective regulation leading to cholesterol accumulation.
  • The beta-VLDL receptor and scavenger receptor show distinct recognition patterns and are poorly regulated by cellular cholesterol.
  • Various modified LDL complexes readily enter macrophages, bypassing regulated pathways.
  • Unregulated lipoprotein entry is a key factor in arterial foam cell development.

Conclusions:

  • Defective regulation of lipoprotein receptors in macrophages promotes cholesterol overload.
  • Multiple pathways exist for lipoprotein internalization, with unregulated pathways being critical for foam cell formation.
  • Understanding these mechanisms is vital for developing therapies against atherosclerosis.

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