Abstract
Study Objective
This study was designed to investigate the possible role of IFN-γ in eosinophil degranulation that occurs during respiratory syncytial virus (RSV) bronchiolitis.
Methods
Sixty-seven infants, 2–24 months old and hospitalized with their first episode of acute RSV bronchiolitis, were selected for this study. Eosinophil-active cytokine and chemokine profiles in nasal lavage supernatants taken within the first 48 h of admission were determined by a multiplex bead array system (Luminex). Comparisons were made with control (Control group) subjects (n = 20).
Results
Nasal IFN-γ levels were significantly higher (P < 0.0001) in RSV bronchiolitis (median = 4.4 pg/ml) infants compared to controls (0.0 pg/ml). IFN-γ levels correlated significantly with the levels of nasal eotaxin (r = 0.566, P < 0.0001), RANTES (r = 0.627, P < 0.0001), GM-CSF (r = 0.849, P < 0.0001), and EDN (r = 0.693, P < 0.001). Nasal interleukin (IL)-4, IL-5, and IL-13 were below sensitivity levels in most RSV bronchiolitis and control subjects.
Conclusion
These results suggest that IFN-γ may play an important role in eosinophilic inflammation in RSV bronchiolitis.
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Acknowledgments
The authors thank Yuhan Corporation for their generous provision of cytokine kits. This study was supported in part by a 2011 Inje University Research Grant.
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The authors state that they have no conflicts of interest to disclose.
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Kim, C.K., Callaway, Z., Koh, Y.Y. et al. Airway IFN-γ Production During RSV Bronchiolitis is Associated with Eosinophilic Inflammation. Lung 190, 183–188 (2012). https://doi.org/10.1007/s00408-011-9349-5
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DOI: https://doi.org/10.1007/s00408-011-9349-5