Interleukin 6 is required for the development of collagen-induced arthritis

Tonino Alonzi, Elena Fattori, Domenico Lazzaro, Patrizia Costa, Lesley Probert, George Kollias, Fabrizio De Benedetti, Valeria Poli, Gennaro Ciliberto

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Interleukin-6 (IL-6) is overproduced in the joints of patients with rheumatoid arthritis (RA) and, based on its multiple stimulatory effects on cells of the immune system and on vascular endothelia, osteoclasts, and synovial fibroblasts, is believed to participate in the development and clinical manifestations of this disease. In this study we have analysed the effect of ablating cytokine production in two mouse models of arthritis: collagen-induced arthritis (CIA) in DBA/1J mice and the inflammatory polyarthritis of tumor necrosis factor α (TNF-α) transgenic mice. IL-6 was ablated by intercrossing an IL-6 null mutation into both arthritis- susceptible genetic backgrounds and disease development was monitored by measuring clinical, histological, and biochemical parameters. Two opposite responses were observed; while arthritis in TNF-α transgenic mice was not affected by inactivation of the IL-6 gene, DBA/1J, IL-6(-/-) mice were completely protected from CIA, accompanied by a reduced antibody response to type II collagen and the absence of inflammatory cells and tissue damage in knee joints. These results are discussed in the light of the present knowledge of cytokine networks in chronic inflammatory disorders and suggest that IL-6 receptor antagonists might be beneficial for the treatment of RA.

Original languageEnglish
Pages (from-to)461-468
Number of pages8
JournalJournal of Experimental Medicine
Issue number4
Publication statusPublished - Feb 16 1998

ASJC Scopus subject areas

  • Immunology


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