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Original Paper

TLR3 in Human Eosinophils: Functional Effects and Decreased Expression during Allergic Rhinitis

Månsson A.a · Fransson M.a · Adner M.a · Benson M.c · Uddman R.a · Björnsson S.b · Cardell L.-O.d

Author affiliations

aLaboratory of Clinical and Experimental Allergy Research, Department of Otorhinolaryngology and bDepartment of Clinical Chemistry, Malmö University Hospital, Lund University, Malmö, cDepartment of Pediatrics, Queen Silvia Children’s Hospital, Sahlgrenska University Hospital, Gothenburg, and dDivision of ENT Diseases Huddinge, Karolinska Institutet, Stockholm, Sweden

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Int Arch Allergy Immunol 2010;151:118–128

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Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: September 22, 2008
Accepted: May 06, 2009
Published online: September 15, 2009
Issue release date: January 2010

Number of Print Pages: 11
Number of Figures: 7
Number of Tables: 3

ISSN: 1018-2438 (Print)
eISSN: 1423-0097 (Online)

For additional information: https://www.karger.com/IAA

Abstract

Background/Aim: Viral respiratory infections are increasingly implicated in allergic exacerbations. Virus-induced activation of eosinophils through Toll-like receptors (TLRs) could be involved. The present study was designed to examine TLR3 expression in eosinophils from bone marrow (BM) and peripheral blood (PB) during symptomatic allergic rhinitis, and to evaluate the functional responsiveness of TLR3 in purified eosinophils. Methods: BM and PB samples were obtained from healthy volunteers and patients with seasonal allergic rhinitis outside and during the pollen season. Eosinophils were analyzed for TLR3 expression by flow cytometry. Polyinosinic:polycytidylic acid [poly(I:C)], an agonist for TLR3, was used to assess its functional role in purified eosinophils and the intracellular signaling pathways involved. Results: TLR3 expression was demonstrated in BM and PB eosinophils. It was higher in BM-derived than in circulating cells and it was downregulated in both compartments during symptomatic allergic rhinitis. TLR3 expression was also downregulated in the presence of interleukin (IL)-4 and IL- 5. Stimulation with poly(I:C) increased the percentage of CD11b+ cells and enhanced the secretion of IL-8, effects mediated via the p38 mitogen-activated protein kinases and nuclear factor-ĸB signaling pathways. Moreover, pretreatment with IL-5 augmented the poly(I:C)-induced IL-8 release. Conclusions: Eosinophils activated via TLR3 might be more able to home and recruit leukocytes to sites of inflammation. The decreased TLR3 expression during symptomatic allergic rhinitis and in the presence of Th2 cytokines indicates a role in allergic airway inflammation. Thus, eosinophils might function as a link between viral infections and exacerbations of allergic disease.

© 2009 S. Karger AG, Basel


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Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: September 22, 2008
Accepted: May 06, 2009
Published online: September 15, 2009
Issue release date: January 2010

Number of Print Pages: 11
Number of Figures: 7
Number of Tables: 3

ISSN: 1018-2438 (Print)
eISSN: 1423-0097 (Online)

For additional information: https://www.karger.com/IAA


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