Rheumatology Advance Access published online on April 10, 2007
Rheumatology, doi:10.1093/rheumatology/kem063
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The TNF superfamily member LIGHT contributes to survival and activation of synovial fibroblasts in rheumatoid arthritis
1Center of Experimental Rheumatology, Department of Rheumatology, University Hospital of Zurich, Switzerland, 2Medical Department IV, Department of Rheumatology, University of Leipzig, Germany and 3Center of Integrative Human Physiology, University of Zurich, Switzerland
Correspondence to:
D. Kyburz, Department of Rheumatology, University Hospital, Gloriastrasse 25, 8091 Zurich, Switzerland. E-mail: diego.kyburz{at}usz.ch
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Abstract |
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Objectives. The TNF superfamily member LIGHT has a T-cell co-stimulatory role and has previously been associated with inflammation and autoimmunity. To investigate its role in rheumatoid arthritis (RA), a disease where activated T cells contribute in a prominent way, we have analysed the expression of LIGHT and its receptors in RA and analysed its effects on synovial fibroblasts in vitro.
Methods. The expression of LIGHT was measured in synovial tissues and fluids and the receptors of LIGHT were detected on synovial fibroblasts derived from patients with RA and osteoarthritis (OA). The effects of recombinant LIGHT on the production of proinflammatory cytokines and proteases and on the apoptosis of synovial fibroblasts was assessed.
Results. LIGHT mRNA was present in synovial tissues of patients with RA but not with OA. Correspondingly, soluble LIGHT protein could be detected in RA synovial fluid samples at much higher levels than in synovial fluid from patients with OA. Immunohistochemical detection of LIGHT and analysis of synovial fluid cells by flow cytometry revealed CD4 T cells as the major source of LIGHT in the rheumatoid joint. Synovial fibroblasts from RA patients were found to express the LIGHT receptors HVEM and LTßR. Recombinant LIGHT induced RA synovial fibroblasts to upregulate MMP-9 mRNA, CD54 and IL-6 in an NF-
B-dependent fashion. In vitro, exposure of cultured synovial fibroblasts to LIGHT reduced FAS-mediated apoptosis significantly, without affecting the rate of spontaneous apoptosis.
Conclusions. The results provide evidence for a novel T-cell-dependent activation of synovial fibroblasts by LIGHT in joints of patients with RA, contributing to an inflammatory and destructive phenotype.
KEY WORDS: Rheumatoid arthritis, Stromal cells, Apoptosis, Cell activation, Inflammation
Submitted 12 May 2006;
revised version accepted 8 February 2007.
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