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The Journal of Immunology, 2000, 165: 7246-7252.
Copyright © 2000 by The American Association of Immunologists

Adenoviral Transfer of Cyclin-Dependent Kinase Inhibitor Genes Suppresses Collagen-Induced Arthritis in Mice1

Kimio Nasu*, Hitoshi Kohsaka2,*, Yoshinori Nonomura*, Yoshio Terada{dagger}, Hiroshi Ito{dagger}, Katsuiku Hirokawa{ddagger} and Nobuyuki Miyasaka*

Departments of * Bioregulatory Medicine and Rheumatology, {dagger} Homeostasis Medicine, and {ddagger} Pathology and Immunology, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan

In rheumatoid synovial tissues, synovial fibroblasts are activated by proinflammatory cytokines and proliferate to develop hyperplastic pannus tissues, which irreversibly damage the affected joints. We recently reported that the cyclin-dependent kinase inhibitors p16INK4a and p21Cip1 are not expressed in vivo in rheumatoid synovial fibroblasts, but are readily inducible in vitro. This observation was followed by the successful treatment of rat adjuvant arthritis by local p16INK4a gene transfer, showing that the inhibition of the cell cycle of the synovial cells ameliorates the arthritis. In this study, we show that another animal model of rheumatoid arthritis, murine collagen-induced arthritis, can be effectively treated by local gene transfer of p21Cip1 as well as that of p16INK4a. The anti-arthritic effects were observed even when the treatment was conducted after the arthritis had developed. Furthermore, the effects included suppression of the expression of proinflammatory cytokines such as IL-1ß, IL-6, and TNF-{alpha}. Our results demonstrate that the ectopic expression of cyclin-dependent kinase inhibitors not only prevents synovial overgrowth but also ameliorates the proinflammatory milieu in the affected joints. The induction of p21Cip1 in rheumatoid synovial tissues by pharmacological agents may also be an effective strategy to treat rheumatoid arthritis.




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