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Serum tryptase level and inflammatory markers in exhaled breath condensate of children with exercise-induced symptoms

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Background:

The pathogenesis of exercise-induced bronchoconstriction (EIB) is poorly understood.

Objective:

To evaluate the biomarkers concentration in exhaled breath condensate (EBC) in schoolchildren with postexercise symptoms. We also evaluated changes in fractional exhaled nitric oxide (FeNO) value and the serum tryptase level after exercise.

Methods:

One hundred children with postexercise symptoms were included. Methacholine challenge testing (MCT) was performed at visit 2, and exercise challenge testing (ECT) was performed at visit 3. Before and after ECT serum tryptase levels and FeNO values were measured. EBC was collected after ECT from 10 randomly selected children from each group. The children were assigned to the following groups: ECT+ MCT+, ECT+ MCT, ECT MCT+, ECT MC. We measured the following molecules: eotaxin, interleukin (IL) 8, IL-1ra, IL-1 beta, IL-6, IL-1 alpha, IL-12(p40), IL-5, granulocyte-macrophage colony-stimulating factor, IL-7, IL-15, IL-4, IL-2, IL-10, tumor necrosis factor alpha, interferon gamma, IL-13, tumor necrosis factor beta, monocyte chemoattractant protein-1, IL-17A, macrophage inflammatory proteins-1 alpha, macrophage inflammatory proteins-1 beta, IL-12(p70), and regulated on activation, normal T-cell expressed and secreted by using a multiplex immunoassay. Prostaglandin E2 (PGE2), leukotriene B4, and cysteinyl leukotriene were analyzed by using separate enzyme-linked immunosorbent assay kits.

Results:

In the MCT+ group, a detectable level of IL4 in EBC and detectible levels of eicosanoids were seen in the ECT+ group. We observed the opposite direction of ECT-induced changes in FeNO and serum tryptase concentrations in patients with detectable compared with patients without detectable levels of cytokines in EBC. We showed ECT-induced reduction in the tryptase level in patients with a nondetectable PGE2 level in EBC and an increase in tryptase levels in patients who had detectable levels of PGE2 in EBC.

Conclusions:

EBC was a useful method to estimate inflammation but only in children with symptoms and with EIB shown by a positive ECT. Children with a positive ECT had detectable levels of eicosanoids in EBC; the opposite direction of ECT-induced changes in FeNO and serum tryptase concentrations was observed. The results of above study confirm the role of mast cells and eicosanoids in the pathogenesis of EIB in children.
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Keywords: Eicosanoids; biomarkers; children; exercise-induced bronchoconstriction; tryptase

Document Type: Research Article

Publication date: September 1, 2016

More about this publication?
  • Allergy and Asthma Proceedings is a peer reviewed publication dedicated to distributing timely scientific research regarding advancements in the knowledge and practice of allergy, asthma and immunology. Its primary readership consists of allergists and pulmonologists.

    The goal of the Proceedings is to publish articles with a predominantly clinical focus which directly impact quality of care for patients with allergic disease and asthma and by having the potential to directly impact the quality of patient care. AAP welcomes the submission of original works including peer-reviewed original research and clinical trial results. Additionally, as the official journal of the Eastern Allergy Conference (EAC), AAP will publish content from EAC poster sessions as well as review articles derived from EAC lectures.

    Featured topics include asthma, rhinitis, sinusitis, food allergies, allergic skin diseases, diagnostic techniques, allergens, and treatment modalities. Published material includes peer-reviewed original research, clinical trials and review articles.

    Articles marked "F" offer free full text for personal noncommercial use only.

    The journal is indexed in Thomson Reuters Web of Science and Science Citation Index Expanded, plus the National Library of Medicine's PubMed service.
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