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Effect of acetaminophen on the myeloperoxidase-hydrogen peroxide-nitrite mediated oxidation of LDL

Tien-min Chou1, Phillip Greenspan

  • 1Department of Pharmaceutical and Biomedical Sciences, College of Pharmacy, University of Georgia, Athens, GA 30602-2356, USA.

Biochimica Et Biophysica Acta
|April 19, 2002
PubMed

Insights

Acetaminophen effectively inhibits myeloperoxidase-driven low-density lipoprotein (LDL) oxidation, preventing harmful modifications. This antioxidant action protects LDL from lipid peroxidation and subsequent macrophage uptake.

Area of Science:

  • Biochemistry
  • Cardiovascular Research
  • Pharmacology

Background:

  • Myeloperoxidase (MPO) enzyme system mediates low-density lipoprotein (LDL) lipid peroxidation.
  • Modified LDL is readily endocytosed by macrophages, contributing to atherosclerosis.
  • Acetaminophen exhibits antioxidant properties and inhibits MPO activity.

Purpose of the Study:

  • To investigate the effect of acetaminophen on MPO-hydrogen peroxide-nitrite mediated LDL oxidation.
  • To determine if acetaminophen prevents LDL modification and subsequent macrophage uptake.

Main Methods:

  • Incubation of LDL with MPO, hydrogen peroxide, and nitrite.
  • Quantification of LDL lipid hydroperoxides and thiobarbituric acid-reactive substances.
  • Assessment of macrophage metabolism of native and modified LDL in the presence of acetaminophen.

Main Results:

  • Acetaminophen significantly reduced LDL lipid hydroperoxides by approximately 80%.
  • Acetaminophen inhibited the production of thiobarbituric acid-reactive substances.
  • Acetaminophen prevented the enhanced macrophage metabolism of MPO-modified LDL.

Conclusions:

  • Acetaminophen is a potent inhibitor of MPO-mediated LDL modification.
  • Acetaminophen's antioxidant activity protects LDL from oxidative damage.
  • These findings suggest a potential therapeutic role for acetaminophen in preventing atherosclerosis progression.

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