IL-8 and neutrophil elastase levels in the respiratory tract of infants with RSV bronchiolitis
Article first published online: 25 DEC 2001
European Respiratory Journal
Volume 14, Issue 1, pages 139–143, July 1999
How to Cite
Abu-Harb, M. , Bell, F. , Finn, A. , Rao, W.H. , Nixon, L., Shale, D. and Everard, M.L. (1999), IL-8 and neutrophil elastase levels in the respiratory tract of infants with RSV bronchiolitis. European Respiratory Journal, 14: 139–143. doi: 10.1034/j.1399-3003.1999.14a23.x
- Issue published online: 25 DEC 2001
- Article first published online: 25 DEC 2001
- neutrophil elastase;
- respiratory syncytial virus
The aim of this study was to determine whether interleukin (IL)-8 is released within the upper respiratory tract of infants during respiratory syncytial virus (RSV) bronchiolitis and whether the large number of polymorphonuclear neutrophils (PMNs) present in the respiratory tract of these infants are contributing to the inflammation through release of inflammatory mediators.
Twenty-seven infants with acute bronchiolitis were recruited during one winter epidemic and 20 infant control subjects were recruited from a cohort participating in a community-based vaccine study. Samples of airways fluid were obtained using nasal lavage. The lavage fluid was spun to remove the cells, and the supernatant was stored at -70°C. The supernatants were subsequently assayed for the presence of IL-8, total human neutrophil elastase (HNE) and neutrophil elastase activity.
In the children with bronchiolitis compared with control infants, elevated levels of IL-8 (median (range) 1.53 (0–153) versus 0 (0–5.6) ng·mL-1) HNE (136 (32–694) versus 14 (0–516) ng·mL-1) and elastase activity (4 (1–220) versus 1 (0–339) mU·mL-1) were found.
These results indicate that interleukin-8 is released in the upper respiratory tract in response to respiratory syncytial virus infection and suggest that polymorphonuclear neutrophil products are playing an important role in the inflammatory response to respiratory syncytial virus infection in infants with acute bronchiolitis. This contrasts with the predominantly eosinophilic response evident in atopic upper and lower respiratory tract disease.