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. 2003 Nov;60(11):892–896. doi: 10.1136/oem.60.11.892

Repeated daily exposure to 2 ppm nitrogen dioxide upregulates the expression of IL-5, IL-10, IL-13, and ICAM-1 in the bronchial epithelium of healthy human airways

S Pathmanathan 1, M Krishna 1, A Blomberg 1, R Helleday 1, F Kelly 1, T Sandstrom 1, S Holgate 1, S Wilson 1, A Frew 1
PMCID: PMC1740417  PMID: 14573722

Abstract

Background: Repeated daily exposure of healthy human subjects to NO2 induces an acute airway inflammatory response characterised by neutrophil influx in the bronchial mucosa

Aims: To assess the expression of NF-κB, cytokines, and ICAM-1 in the bronchial epithelium.

Methods: Twelve healthy, young non-smoking volunteers were exposed to 2 ppm of NO2/filtered air (four hours/day) for four successive days on separate occasions. Fibreoptic bronchoscopy was performed one hour after air and final NO2 exposures. Bronchial biopsy specimens were immunostained for NF-κB, TNF-α, eotaxin, Gro-α, GM-CSF, IL-5, -6, -8, -10, -13, and ICAM-1 and their expression was quantified using computerised image analysis.

Results: Expression of IL-5, IL-10, IL-13, and ICAM-1 increased following NO2 exposure.

Conclusion: Upregulation of the Th2 cytokines suggests that repeated exposure to NO2 has the potential to exert a "pro-allergic" effect on the bronchial epithelium. Upregulation of ICAM-1 highlights an underlying mechanism for leucocyte influx, and could also explain the predisposition to respiratory tract viral infections following NO2 exposure since ICAM-1 is a major receptor for rhino and respiratory syncytial viruses.

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Selected References

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