[en] BACKGROUND: Local IgE production may play a role in asthma pathogenesis. The aim of the study was to assess sputum total IgE and cytokines in asthmatics according to sputum cellular phenotype. METHODS: We studied 122 subjects including 22 non atopic healthy subjects, 41 eosinophilic (sputum eosinophils >/=3%), 16 neutrophilic (sputum neutrophils >76%) and 43 pauci-granulocytic asthmatics (sputum eosinophils <3% and sputum neutrophils </=76%) recruited from the asthma clinic at CHU Liege. Sputum supernatant total IgE (tIgE) was measured by ImmunoCAP and sputum supernatant cytokines (IL-4, IL-5, IL-6, IL-10, IL-13, IL-17, IFN-gamma and TNF-alpha) were measured with the Luminex xMAP Technology by using commercially available Fluorokine MAP kits. RESULTS: After concentrating sputum samples, total IgE was detectable in the majority of subjects. Sputum IgE was raised in asthmatics when compared to healthy subjects. Overall, asthmatics did not significantly differ from healthy subjects with respect to cytokine levels. The eosinophilic asthma phenotype, however, was characterised by raised sputum tIgE, IL-5 and IL-13 compared to healthy subjects (p<0.001, p<0.001 and p<0.05 respectively) and pauci-granulocytic asthma (p<0.01, p<0.001 and p<0.05 respectively) and raised IL-5 compared to neutrophilic asthma (p<0.01). When patients were classified according to sputum IgE levels, it appeared that IL-5, IL-6, IL-17 and TNF-alpha sputum supernatant levels were raised in the "IgE high" asthmatics (IgE >/=0.1 kU/l) when compared to "IgE low" asthmatics (IgE<0.1 kU/l). CONCLUSION: The eosinophilic asthma phenotype was associated with raised sputum IgE and a Th2 cytokine profile. Raised sputum IgE was associated with a heterogeneous cytokine overproduction.
Disciplines :
Cardiovascular & respiratory systems
Author, co-author :
Manise, Maïté ; Université de Liège - ULiège > Département des sciences cliniques > Pneumologie - Allergologie
Holtappels, Gabriele
Van Crombruggen, Koen
SCHLEICH, FLorence ; Centre Hospitalier Universitaire de Liège - CHU > Pneumologie-Allergologie
Bachert, Claus
LOUIS, Renaud ; Centre Hospitalier Universitaire de Liège - CHU > Pneumologie-Allergologie
Language :
English
Title :
Sputum IgE and Cytokines in Asthma: Relationship with Sputum Cellular Profile.
Publication date :
2013
Journal title :
PLoS ONE
eISSN :
1932-6203
Publisher :
Public Library of Science, United States - California
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