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Viral IL-10 (vIL-10) and soluble TNF receptor (sTNFR) are anti-inflammatory proteins that can suppress collagen-induced arthritis (CIA). These and related proteins have shown efficacy in the treatment of human rheumatoid arthritis; however, neither alone is able to completely suppress disease. Furthermore, they have short half-lives, necessitating frequent administration. To determine the ability of these proteins to act synergistically following gene transfer, arthritis was induced in DBA/1 male mice by immunization with type II collagen on days 0 and 21. Mice were injected i.v. either before disease onset (day 20) or after disease onset (day 28) with 1010 particles of adenovirus encoding vIL-10, a soluble TNF receptor-IgG1 fusion protein (sTNFR-Ig), a combination of both vectors, or a control vector lacking a transgene. Significant synergism was observed with the combination of vIL-10 and sTNFR-Ig, with a substantial reduction in both the incidence and severity of disease as well as inhibition of progression of established disease. sTNFR-Ig alone had no effect on CIA. vIL-10 alone inhibited disease when given before disease onset, but had minimal effect on established disease. Both proteins inhibited spleen cell proliferation and IFN-gamma secretion in response to stimulation with type II collagen, but only vIL-10 reduced the synovial mRNA levels of the proinflammatory cytokines IL-1beta, TNF-alpha, and IL-6. These findings demonstrate that vIL-10 and sTNFR-Ig act synergistically in suppressing CIA and suggest that gene transfer offers a potential therapeutic modality for the treatment of arthritis.

Viral IL-10 and Soluble TNF Receptor Act Synergistically to Inhibit Collagen-Induced Arthritis Following Adenovirus- Mediated Gene Transfer