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High concentrations of pepsin in bronchoalveolar lavage fluid from children with cystic fibrosis are associated with high interleukin-8 concentrations

Record type: Article

Background. Gastro-oesophageal reflux is common in children with cystic fibrosis (CF) and is thought to be associated with pulmonary aspiration of gastric contents. The measurement of pepsin in bronchoalveolar lavage (BAL) fluid has recently been suggested to be a reliable indicator of aspiration. The prevalence of pulmonary aspiration in a group of children with CF was assessed and its association with lung inflammation investigated.

Methods. This was a cross-sectional case-control study. BAL fluid was collected from individuals with CF (n¼31) and healthy controls (n¼7). Interleukin-8 (IL-8), pepsin, neutrophil numbers and neutrophil elastase activity levels were measured in all samples. Clinical, microbiological and lung function data were collected from medical notes.

Results. The pepsin concentration in BAL fluid was higher in the CF group than in controls (mean (SD) 24.4 (27.4) ng/ml vs 4.3 (4.0) ng/ml, p¼0.03). Those with CF who had raised pepsin concentrations had higher levels of IL-8 in the BAL fluid than those with a concentration comparable to controls (3.7 (2.7) ng/ml vs 1.4 (0.9) ng/ml, p¼0.004). Within the CF group there was a moderate positive correlation between pepsin concentration and IL-8 in BAL fluid (r¼0.48, p¼0.04). There was no association between BAL fluid pepsin concentrations and age, sex, body mass index z score, forced expiratory volume in 1 s or Pseudomonas aeruginosa colonisation status.

Conclusions. Many children with CF have increased levels of pepsin in the BAL fluid compared with normal controls. Increased pepsin levels were associated with higher IL-8 concentrations in BAL fluid. These data suggest that aspiration of gastric contents occurs in a subset of patients with CF and is associated with more pronounced lung inflammation.

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Citation

McNally, P., Ervine, E., Shields, M.D., Dimitrov, B.D., El Nazir, B., Taggart, C.C., Greene, C.M., McElvaney, N.G. and Greally, P. (2011) High concentrations of pepsin in bronchoalveolar lavage fluid from children with cystic fibrosis are associated with high interleukin-8 concentrations Thorax, 66, (2), pp. 140-143. (doi:10.1136/thx.2009.130914). (PMID:21160087).

More information

Published date: February 2011
Organisations: Primary Care & Population Sciences

Identifiers

Local EPrints ID: 337412
URI: http://eprints.soton.ac.uk/id/eprint/337412
ISSN: 0040-6376
PURE UUID: f7fc4128-a4a2-4cdd-83ba-36ee9af931fd

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Date deposited: 25 Apr 2012 13:27
Last modified: 18 Jul 2017 06:03

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Contributors

Author: P. McNally
Author: E. Ervine
Author: M.D. Shields
Author: B.D. Dimitrov
Author: B. El Nazir
Author: C.C. Taggart
Author: C.M. Greene
Author: N.G. McElvaney
Author: P. Greally

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