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Oxygen radicals and atherosclerosis.

K L Carpenter1, C E Brabbs, M J Mitchinson

  • 1Department of Pathology, University of Cambridge.

Klinische Wochenschrift
|December 15, 1991
PubMed
Summary

Macrophages can oxidize lipids, forming oxidized sterols and ceroid, which may drive atherosclerosis progression. Radical scavengers inhibited this process, suggesting potential therapeutic targets.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Pathology

Background:

  • Atherosclerosis involves lipid oxidation within macrophages, forming foam cells.
  • Macrophages produce oxygen radicals, potentially oxidizing lipids and lipoproteins.
  • Ceroid, an oxidized lipid-protein polymer, is found in human atherosclerotic lesions.

Purpose of the Study:

  • To investigate the role of macrophages in lipid and lipoprotein oxidation.
  • To determine if macrophages can oxidize cholesteryl linoleate in vitro.
  • To explore the formation of ceroid by macrophages.

Main Methods:

  • In vitro culture of mouse peritoneal macrophages and human monocyte-derived macrophages.
  • Incubation with artificial lipoproteins containing cholesteryl linoleate.
  • Analysis of lipid oxidation products and ceroid formation.
  • Assessment of radical scavenger effects.

Main Results:

  • Macrophages oxidized cholesteryl linoleate, producing soluble oxidized lipids and oxidized sterols.
  • Mouse peritoneal macrophages produced abundant ceroid.
  • Radical scavengers significantly inhibited the oxidation process.
  • Oxidized sterols were found to be cytotoxic.

Conclusions:

  • Macrophages are capable of oxidizing lipids and lipoproteins in vitro.
  • Macrophage-derived oxidized sterols may contribute to lesion necrosis and progression.
  • Inhibition of lipid oxidation by radical scavengers offers potential therapeutic strategies for atherosclerosis.

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