3-Nitrotyrosine, a marker of nitrosative stress, is increased in breath condensate of allergic asthmatic children

Allergy. 2006 Jan;61(1):90-6. doi: 10.1111/j.1398-9995.2006.00996.x.

Abstract

Background: Asthmatic patients have high exhaled nitric oxide (NO) levels. NO-mediated inflammatory actions are mainly due to NO conversion into reactive nitrogen species, which can lead to nitrotyrosine formation. The aim of this study was to assess 3-nitrotyrosine (3-NT) levels in exhaled breath condensate (EBC) of asthmatic and healthy children and to investigate whether there is any relationship with exhaled NO (FE(NO)) and lung function.

Methods: The study included 20 asthmatic children (10 steroid-naive with intermittent asthma, 10 steroid-treated with unstable persistent asthma) and 18 healthy controls. They underwent FE(NO) measurement, EBC collection and spirometry. 3-NT was measured by a new liquid chromatography-tandem mass spectrometry (LC-MS/MS) method in isotopic dilution.

Results: The median EBC concentration of 3-NT (expressed as nitrotyrosine/tyrosine ratio x 100) in asthmatic children was fivefold higher than in healthy subjects [0.23% (0.12-0.32) vs 0.04% (0.02-0.06), P < 0.001] with no difference between steroid-naive and unstable steroid-treated asthmatic patients. FE(NO) levels were higher in asthmatic [44.6 ppb (36.0-66.0)] than in healthy children [7.5 ppb (6.0-8.8), P < 0.001]. No correlation was found among 3-NT, FE(NO) and lung function parameters.

Conclusion: Nitrotyrosine is high in EBC of asthmatic children and could be considered as a noninvasive marker of nitrosative events in the airways.

Publication types

  • Comparative Study

MeSH terms

  • Adolescent
  • Anti-Asthmatic Agents / therapeutic use
  • Asthma / diagnosis*
  • Asthma / drug therapy
  • Asthma / immunology
  • Biomarkers / analysis
  • Breath Tests
  • Case-Control Studies
  • Child
  • Female
  • Humans
  • Male
  • Nitric Oxide / analysis
  • Nitric Oxide / metabolism*
  • Probability
  • Reference Values
  • Respiratory Function Tests
  • Sensitivity and Specificity
  • Severity of Illness Index
  • Spirometry / methods
  • Tyrosine / analogs & derivatives*
  • Tyrosine / analysis

Substances

  • Anti-Asthmatic Agents
  • Biomarkers
  • Nitric Oxide
  • 3-nitrotyrosine
  • Tyrosine