Soluble TNF-like cytokine (TL1A) production by immune complexes stimulated monocytes in rheumatoid arthritis

Marco A. Cassatella, Gabriela Pereira Da Silva, Ilaria Tinazzi, Fabio Facchetti, Patrizia Scapini, Federica Calzetti, Nicola Tamassia, Ping Wei, Bernardetta Nardelli, Viktor Roschke, Annunciata Vecchi, Alberto Mantovani, Lisa M. Bambara, Steven W. Edwards, Antonio Carletto

Research output: Contribution to journalArticlepeer-review


TNF-like cytokine (TL1A) is a newly identified member of the TNF superfamily of ligands that is important for T cell costimulation and Th1 polarization. However, despite increasing information about its functions, very little is known about expression of TL1A in normal or pathological states. In this study, we report that mononuclear phagocytes appear to be a major source of TL1A in rheumatoid arthritis (RA), as revealed by their strong TL1A expression in either synovial fluids or synovial tissue of rheumatoid factor (RF)-seropositive RA patients, but not RF-/RA patients. Accordingly, in vitro experiments revealed that human monocytes express and release significant amounts of soluble TL1A when stimulated with insoluble immune complexes (IC), polyethylene glycol precipitates from the serum of RF+/RA patients, or with insoluble ICs purified from RA synovial fluids. Monocyte-derived soluble TL1A was biologically active as determined by its capacity to induce apoptosis of the human erythroleukemic cell line TF-1, as well as to cooperate with IL-12 and IL-18 in inducing the production of IFN-γ by CD4+ T cells. Because RA is a chronic inflammatory disease with autoimmune etiology, in which ICs, autoantibodies (including RF), and various cytokines contribute to its pathology, our data suggest that TL1A could be involved in its pathogenesis and contribute to the severity of RA disease that is typical of RF+/RA patients.

Original languageEnglish
Pages (from-to)7325-7333
Number of pages9
JournalJournal of Immunology
Issue number11
Publication statusPublished - Jun 1 2007

ASJC Scopus subject areas

  • Immunology


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