Increased myeloperoxidase activity and protein nitration are indicators of inflammation in patients with chagas' disease

Monisha Dhiman, Jose Guillermo Estrada-Franco, Jasmine M. Pando, Francisco J. Ramirez-Aguilar, Heidi Spratt, Sara Vazquez-Corzo, Gladys Perez-Molina, Rosa Gallegos-Sandoval, Roberto Moreno, Nisha Garg

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Abstract

In this study, we investigated whether inflammatory responses contribute to oxidative/nitrosative stress in patients with Chagas' disease. We used three tests (enzyme-linked immunosorbent assay, immuno-flow cytometry, and STAT-PAK immunochromatography) to screen human serum samples (n = 1,481) originating from Chiapas, Mexico, for Trypanosoma crwzi-specific antibodies. We identified 121 subjects who were seropositive for T. crwzi'-specific antibodies, a finding indicative of an 8.5% seroprevalence in the rural population from Chiapas. Seropositive and seronegative subjects were examined for plasma levels of biomarkers of inflammation, i.e., myeloperoxidase (MPO), inducible nitric oxide synthase (iNOS), and xanthine oxidase (XOD), as well as for oxidative (advanced oxidation protein products [AOPPs]) and nitrosative (3-nitroty- rosine [3NT]) biomarkers. The seropositive subjects exhibited a significant increase in MPO activity and protein level, the indicator of neutrophil activation. Subsequently, a corresponding increase in AOPP contents, formed by MPO-dependent hypochlorous acid and chloramine formation, was noted in seropositive subjects. The plasma level of 3NT was significantly increased in seropositive subjects, yet we observed no change in XOD activity (OO 2 ̇- source) and nitrate/nitrite contents (denotes iNOS activation and 'NO production), which implied that direct peroxynitrite formation does not contribute to increased nitrosative damage in chagasic subjects. Instead, a positive correlation between increased MPO activity and protein 3NT formation was observed, which suggested to us that MPO-dependent formation of nitrylchloride that occurs in the presence of physiological 'NO and O 2 ̇-p concentrations contributes to protein nitration. Overall, our data demonstrate that T. crwzi-induced neutrophil activation is pathological and contributes to MPO-mediated collateral protein oxidative and nitrosative damage in human patients with Chagas' disease. Therapies capable of suppressing MPO activity may be useful in controlling the inflammation and oxidative/nitrosative pathology in chagasic cardiomyopathy.

Original languageEnglish (US)
Pages (from-to)660-666
Number of pages7
JournalClinical and Vaccine Immunology
Volume16
Issue number5
DOIs
StatePublished - May 2009

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Nitration
Chagas Disease
Peroxidase
Inflammation
Advanced Oxidation Protein Products
Proteins
Neutrophil Activation
Xanthine Oxidase
Chemical activation
Biomarkers
Nitric Oxide Synthase Type II
Immunochromatography
Trypanosoma
Plasmas
Hypochlorous Acid
Immunosorbents
Peroxynitrous Acid
Oxidative stress
Flow cytometry
Antibodies

ASJC Scopus subject areas

  • Clinical Biochemistry
  • Immunology
  • Immunology and Allergy
  • Microbiology (medical)

Cite this

Increased myeloperoxidase activity and protein nitration are indicators of inflammation in patients with chagas' disease. / Dhiman, Monisha; Estrada-Franco, Jose Guillermo; Pando, Jasmine M.; Ramirez-Aguilar, Francisco J.; Spratt, Heidi; Vazquez-Corzo, Sara; Perez-Molina, Gladys; Gallegos-Sandoval, Rosa; Moreno, Roberto; Garg, Nisha.

In: Clinical and Vaccine Immunology, Vol. 16, No. 5, 05.2009, p. 660-666.

Research output: Contribution to journalArticle

Dhiman, M, Estrada-Franco, JG, Pando, JM, Ramirez-Aguilar, FJ, Spratt, H, Vazquez-Corzo, S, Perez-Molina, G, Gallegos-Sandoval, R, Moreno, R & Garg, N 2009, 'Increased myeloperoxidase activity and protein nitration are indicators of inflammation in patients with chagas' disease', Clinical and Vaccine Immunology, vol. 16, no. 5, pp. 660-666. https://doi.org/10.1128/CVI.00019-09
Dhiman, Monisha ; Estrada-Franco, Jose Guillermo ; Pando, Jasmine M. ; Ramirez-Aguilar, Francisco J. ; Spratt, Heidi ; Vazquez-Corzo, Sara ; Perez-Molina, Gladys ; Gallegos-Sandoval, Rosa ; Moreno, Roberto ; Garg, Nisha. / Increased myeloperoxidase activity and protein nitration are indicators of inflammation in patients with chagas' disease. In: Clinical and Vaccine Immunology. 2009 ; Vol. 16, No. 5. pp. 660-666.
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