Cited by 842Neutrophil, Myeloperoxidase and Oxidative MechanismsAtherosclerosis and Cardiovascular DiseasesNitric Oxide and Endothelin Effects

3-Chlorotyrosine, a specific marker of myeloperoxidase-catalyzed oxidation, is markedly elevated in low density lipoprotein isolated from human atherosclerotic intima.

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Hazen, S L, Heinecke, J W·1997·Journal of Clinical Investigation

Abstract

Oxidation of LDL may be of pivotal importance in atherogenesis, but the mechanisms that promote oxidation in vivo remain poorly understood. We have explored the possibility that one pathway involves myeloperoxidase, a heme protein secreted by phagocytes. Myeloperoxidase is the only human enzyme known to generate hypochlorous acid (HOCl), a potent oxidizing agent, at physiological halide concentrations. LDL exposed to the complete myeloperoxidase-H2O2-Cl- system underwent chlorination of its protein tyrosyl residues. Treatment of LDL with reagent HOCl resulted in 3-chlorotyrosine formation, implicating HOCl as an intermediate in the enzymatic reaction pathway. In contrast, 3-chlorotyrosine was undetectable in LDL oxidized by hydroxyl radical, copper, iron, hemin, glucose, peroxynitrite, horseradish peroxidase, lactoperoxidase, or lipoxygenase. These results indicate that 3-chlorotyrosine is a specific marker for LDL oxidation by myeloperoxidase. To address the role of myeloperoxidase in promoting LDL oxidation in vivo, we used stable isotope dilution gas chromatography-mass spectrometry to quantify 3-chlorotyrosine in human aortic tissue and in LDL isolated from atherosclerotic lesions. The level of 3-chlorotyrosine in atherosclerotic tissue obtained during vascular surgery was sixfold higher than that of normal aortic intima. Moreover, the level of 3-chlorotyrosine was 30-fold higher in LDL isolated from atherosclerotic intima compared with circulating LDL. The detection of 3-chlorotyrosine in human atherosclerotic lesions indicates that halogenation reactions catalyzed by the myeloperoxidase system of phagocytes constitute one pathway for protein oxidation in vivo. These findings raise the possibility that the myeloperoxidase-H2O2-Cl- system plays a critical role in converting LDL into an atherogenic form.

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  1. [39]39. Knapp, D.R. 1979. Handbook of Analytical Derivitization Reactions. John Wiley & Sons, New York.
  2. [51]51. Ursine, F., and K.J.A. Davies. 1990. Protein Metabolism in Aging. H.L. Segal, editor. Wiley-Liss, New York. 373-380.

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Authors
Hazen, S. L., & Heinecke, J. W.
Affiliations
Washington University in St. Louis (US)
Venue
Journal of Clinical Investigation
Published
1997-05-01
Volume
99
Issue
9
Pages
2075-2081
ISSN
0021-9738 (ISSN-L)
OpenAlex
W2075034126
Cited by
842
References
52
Citations by year
2026: 5 · 2025: 9 · 2024: 13 · 2023: 5 · 2022: 18 · 2021: 21 · 2020: 26 · 2019: 15 · 2018: 23 · 2017: 23 · 2016: 29 · 2015: 28 · 2014: 29 · 2013: 22 · 2012: 29
FWCI
18.00
Type
journal article
Language
en
Open access
Locations
  • Journal of Clinical Investigation (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • American Heart Association
  • National Institutes of Health (5p41rr000954-34, 5r01ag012293-05)
  • National Institute on Aging (AG12293)
  • National Center for Research Resources (RR 00954)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Neutrophil, Myeloperoxidase and Oxidative Mechanisms
  • Life Sciences › Immunology and Microbiology › Immunology › Atherosclerosis and Cardiovascular Diseases
  • Health Sciences › Medicine › Physiology › Nitric Oxide and Endothelin Effects
Keywords
3-chlorotyrosine, myeloperoxidase, LDL oxidation, hypochlorous acid, atherosclerosis, aortic intima, phagocyte oxidative metabolism, atherogenesis
MeSH terms
Aorta, Apolipoproteins B, Arteriosclerosis, Chlorine, Humans, Hypochlorous Acid, Lipoproteins, Lipoproteins, LDL, Peroxidase, Oxidation-Reduction, Phagocytes, Tyrosine, Biomarkers

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