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The effect of allergen‐induced bronchoconstriction on concentration of 5‐oxo‐ETE in exhaled breath condensate of house dust mite‐allergic patients
Author(s) -
Kowal K.,
Gielicz A.,
Sanak M.
Publication year - 2017
Publication title -
clinical and experimental allergy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.462
H-Index - 154
eISSN - 1365-2222
pISSN - 0954-7894
DOI - 10.1111/cea.12990
Subject(s) - bronchoconstriction , exhaled breath condensate , house dust mite , allergen , asthma , immunology , medicine , allergy , leukotriene , chemistry
Summary Background Arachidonic acid metabolites regulate several aspects of airway function including inflammation, muscle contraction and mucous secretion. Objective The aim of this study was to evaluate concentration of selected 5‐lipoxygenase‐ and cyclooxygenase‐derived eicosanoids in exhaled breath condensate (EBC) during allergen‐induced bronchoconstriction. Methods The study was performed on 24 allergic rhinitis/asthma patients sensitized to a house dust mite (HDM) Dermatophagoides pteronyssinus (Dp) and 13 healthy controls (HCs). Bronchial challenge with Dp extract was performed only in the allergic patients. EBC samples were collected before ( T 0 ) and during Dp‐induced bronchoconstriction ( T EAR ). Eicosanoid concentration was measured using HPLC‐tandem mass spectrometry. Results Significant bronchoconstriction after Dp challenge was demonstrated in 15 patients (Rs), while in 9 patients (NRs) no asthmatic response could be detected. At T 0 the most abundant eicosanoids in EBC of HDM‐allergic patients were LTB 4 and 5‐oxo‐ETE, while in HCs EBC concentration of LTB 4 was significantly greater than that of 5‐oxo‐ETE. Allergen challenge resulted in significant increase in EBC concentration of 5‐oxo‐ETE, LTD 4 and 8‐iso‐PGE 2 only in Rs. At T EAR , the relative change of 5‐oxo‐ETE concentration in EBC correlated with decrease of peripheral blood eosinophilia ( R = −0.774; P = .0012). Moreover, the relative increase of 5‐oxo‐ETE in EBC at T EAR significantly correlated with the severity of the subsequent late asthmatic response ( R = 0.683, P = .007). Conclusion Our study demonstrates significant up‐regulation of 5‐oxo‐ETE synthesis in HDM‐allergic patients and indicates possible involvement of that mediator in the pathogenesis of allergic asthma.