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- Title
Neutrophils produce interleukin-17B in rheumatoid synovial tissue.
- Authors
Kouri, Vesa-Petteri; Olkkonen, Juri; Ainola, Mari; Li, Tian-Fang; Björkman, Lena; Konttinen, Yrjö T.; Mandelin, Jami
- Abstract
Objective. T helper 17 (Th17) and mast cells produce IL-17A in RA and critically contribute to the pathogenesis of RA. However, the complete IL-17 cytokine profile in RA is unknown. The aim of the study was to systematically study the expression of IL-17 family cytokines in RA.Methods. The expression of all IL-17 cytokines in RA synovium and pannus as well as in the synovium of OA was determined using quantitative RT-PCR (qRT-PCR). IL-17A and IL-17B were immunostained. Peripheral blood neutrophils were analysed for IL-17B. The effect of IL-17B alone or in combination with TNF-α was tested in vitro on fibroblasts and endothelial cells.Results. In all tissues IL-17B was the most expressed IL-17 family cytokine, found in lining but most strongly expressed in human neutrophil elastase containing polymorphonuclear cells. This pattern was distinct from that of IL-17A, which was found in mast cell tryptase immunoreactive cells. Circulating neutrophils contained IL-17B, verifying the in vivo results. Fibroblasts up-regulated the expression of IL-17RB, a putative receptor of IL-17B, after TNF-α stimulation. IL-17B significantly enhanced TNF-α-induced production of G-CSF and IL-6 in fibroblasts.Conclusion. IL-17B, which is present in synovium, may contribute to the pathogenesis of RA. IL-17B can enhance the effects of TNF-α on the production of cytokines and chemokines that control immune cell trafficking and neutrophil homeostasis in the inflamed tissues.
- Subjects
FINLAND; NEUTROPHILS; ACADEMIC medical centers; ANALYSIS of variance; IMMUNOHISTOCHEMISTRY; INTERLEUKINS; POLYMERASE chain reaction; RESEARCH funding; RHEUMATOID arthritis; STATISTICS; WESTERN immunoblotting; SYNOVITIS; DATA analysis; REVERSE transcriptase polymerase chain reaction; DATA analysis software; PHYSIOLOGY
- Publication
Rheumatology, 2014, Vol 53, Issue 1, p39
- ISSN
1462-0324
- Publication type
Article
- DOI
10.1093/rheumatology/ket309