Abstract
Purpose
Lung inflammation from exposure to airborne particulate matter (PM) may be responsible for morbidity in asthma, but several studies using environmental monitoring data showed inconsistent results. Thus, the aim of this study was to evaluate the capability of induced sputum (IS) technology in order to biologically monitor PM in the lungs of urban asthmatic children.
Methods
We collected clinical, demographic, biological and environmental monitoring data on 136 children referred for asthma evaluations. The study participants were divided into two groups according to IS eosinophil counts of <3 % (non-eosinophilic inflammation, n = 52) and ≥3 % (eosinophilic inflammation, n = 84).
Results
The eosinophilic group displays significantly higher levels of fractional exhaled nitric oxide than the non-eosinophilic one (58.8 ± 47.5 vs 28.9 ± 34.2 ppm, p = 0.007). Particles (0–2.5 and 0–5 µm) comprised a strong risk factor for eosinophilic inflammation in IS (≥3 %). Children with >80 % of particles (0–2.5 µm) out of the total PM accumulated in the airways displayed the highest OR 10.7 (CI 2.052–56.4 p = 0.005) for an existing eosinophilic inflammation. Heme oxygenase-1 (HO-1) enzyme levels in IS positively correlated with % eosinophils and with particles in IS ranging between 2 and 3 μm. The level of HO-1 enzyme activity and FEV1/FVC in children with <3 % eosinophils, but not ≥3 %, was positively and significantly correlated, showing a protective effect of HO-1.
Conclusion
Accumulation of PM involves oxidative stress pathways and is a risk factor for developing eosinophilic inflammation in asthmatic children. IS can biologically monitor this process.
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Esther Eshkol is thanked for editorial assistance.
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Fireman, E., Bliznuk, D., Schwarz, Y. et al. Biological monitoring of particulate matter accumulated in the lungs of urban asthmatic children in the Tel-Aviv area. Int Arch Occup Environ Health 88, 443–453 (2015). https://doi.org/10.1007/s00420-014-0972-3
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DOI: https://doi.org/10.1007/s00420-014-0972-3