Damage‐associated molecular pattern and innate cytokine release in the airways of competitive swimmers. Issue 2 (February 2015)

• Record Type: Journal Article
• Authors: Seys, S. F.; Hox, V.; Van Gerven, L.; Dilissen, E.; Marijsse, G.; Peeters, E.; Dekimpe, E.; Kasran, A.; Aertgeerts, S.; Troosters, T.; Vanbelle, V.; Peers, K.; Ceuppens, J. L.; Hellings, P. W.; Dupont, L. J.; Bullens, D. M.
• Is Part Of: Allergy. Volume 70:Issue 2(2015:Feb.)
• Page Start: 187
• Page End: 194
• Publication Date: 2015-02
• Subjects: Allergy -- Periodicals; 616.97
• DOI: 10.1111/all.12540
• Languages: English
• ISSNs: 0105-4538

Abstract

<abstract abstract-type="main" id="all12540-abs-0001"> <title>Abstract</title> <sec id="all12540-sec-0001" sec-type="section"> <title>Background</title> <p>Daily intensive exercise by elite athletes can result in exercise‐induced asthma especially in elite swimmers and this may be linked to epithelial damage.</p> </sec> <sec id="all12540-sec-0002" sec-type="section"> <title>Objective</title> <p>To study airway epithelial damage and release of damage‐associated molecular patterns (DAMPs) after intensive exercise in elite athletes and controls.</p> </sec> <sec id="all12540-sec-0003" sec-type="section"> <title>Methods</title> <p>We recruited competitive swimmers (<italic>n</italic> = 26), competitive indoor athletes (<italic>n</italic> = 13) and controls (<italic>n</italic> = 15) without any history of asthma. Lung function was measured before, immediately after and 24 h after a 90‐min intensive exercise protocol. Sputum induction was performed at baseline and 24 h after exercise. Exercise‐induced bronchoconstriction (EIB) was assessed by the eucapnic voluntary hyperventilation test.</p> </sec> <sec id="all12540-sec-0004" sec-type="section"> <title>Results</title> <p>Baseline sputum uric acid, high mobility group box‐1, CXCL8 mRNA, sputum neutrophils and serum Clara cell protein‐16 (CC‐16) were significantly higher in competitive swimmers compared with controls. Intensive swimming for 90 min resulted in an increase of sputum IL‐1β, IL‐6 and TNF mRNA in competitive swimmers, and of sputum IL‐6 mRNA and sputum neutrophils in controls. Although all participants were asymptomatic, seven competitive swimmers, one indoor athlete and one control met the criteria for EIB.</p> </sec> <sec id="all12540-sec-0005" sec-type="section"> <title>Conclusion</title> <p>Our findings show that the intensive training combined with exposure to by‐products of chlorination induces airway epithelial damage in competitive swimmers. This is associated with increased damage‐associated molecular patterns, innate cytokine release and neutrophilic airway inflammation.</p> </sec> </abstract>