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Increased CD40 Expression on Articular Chondrocytes from Patients with Rheumatoid Arthritis: Contribution to Production of Cytokines and Matrix Metalloproteinases
HARUHIKO GOTOH, YASUSHI KAWAGUCHI, MASAYOSHI HARIGAI, MASAKO HARA, SEIJI SAITO, TOSHIHITO YAMAGUCHI, KATSUHIRO SHIMADA, MANABU KAWAMOTO, TAISUKE TOMATSU, and NAOYUKI KAMATANI
ABSTRACT. Methods. Articular cartilage samples were obtained from patients with RA and OA at total knee arthroplasty. Expression of CD40 on chondrocytes was examined using immunohistochemistry, reverse transcriptase-polymerase chain reaction (RT-PCR), and flow cytometry. Tumor necrosis factor-a (TNF-a), interleukin 6 (IL-6), matrix metalloproteinase (MMP)-3, and tissue inhibitor of matrix metalloproteinase (TIMP)-1 in culture supernatants of chondrocytes were measured by ELISA. Results. Immunohistochemical staining revealed that CD40 was expressed on RA chondrocytes in vivo, but not in OA chondrocytes. RT-PCR and flow cytometry showed that cultured articular chondrocytes from RA patients, but not from OA patients, constitutively expressed CD40, and that interferon-g (IFN-g) enhanced the expression of CD40 on chondrocytes from both RA and OA patients. Membrane fraction of mouse myeloma Ag8 cells that was transfected with human CD154 (Ag8-hCD154) induced production of TNF-a, IL-6, and MMP-3 in RA chondrocytes, and pretreatment of RA chondrocytes with IFN-g enhanced the response. OA chondrocytes did not respond to stimulation with the membrane fraction of Ag8-hCD154 cells alone, but the cells did produce TNF-a, IL-6, and MMP-3 after pretreatment with IFN-g. Conclusion. CD40-CD154 interaction augments the expression of inflammatory cytokines and MMP in chondrocytes and contributes to an intrinsic process of cartilage degradation in RA. (J Rheumatol 2004;31:1506-12) Key Indexing Terms:
ARTICULAR CHONDROCYTES
From the Institute of Rheumatology, Tokyo Women's Medical University, Tokyo; Institute of Hand Surgery and Sports Medicine, Hachioji; and Department of Orthopedics, National Murayama Hospital, Musashimurayama, Japan. H. Gotoh, MD; Y. Kawaguchi, MD, PhD; M. Harigai, MD, PhD; M. Hara, MD, PhD; S. Saito, MD, PhD; M. Kawamoto, PhD; T. Tomatsu, MD, PhD; N. Kamatani, MD, PhD, Tokyo Women's Medical University; T. Yamaguchi, MD, PhD, Institute of Hand Surgery and Sports Medicine; K. Shimada, MD, PhD, National Murayama Hospital. Address reprint requests to Dr. Y. Kawaguchi, Institute of Rheumatology, Tokyo Women's Medical University, 10-22 Kawada-cho, Shinjuku-ku, Tokyo 162-0054, Japan. E-mail: y-kawa@ior.twmu.ac.jp Submitted August 18, 2003; revision accepted February 4, 2004. |