Abstract
An enhanced expression of the inflammatory mediators in the perimeniscal synovium in knee osteoarthritis (OA) has been suggested to contribute to progressive cartilage degeneration. However, whether the expression levels of these molecules correlated with the severity of OA still remained unclear. Medial perimeniscal synovial samples were obtained from 23 patients with Kellgren-Lawrence (K/L) grades 2 to 4 of medial knee OA. Immunohistochemical analysis of the synovium revealed that the MMP-1, COX-2 and IL-1β expression of the patients with K/L 4 to be significantly reduced in comparison to those with either K/L 2 or 3, while the TGF-β expression showed the opposite. The synovial expression of MMP-1 and IL-1β showed a significant negative correlation with the severity of OA, while that of TGF-β again showed the opposite. In conclusion, although synovial inflammation remained active, the MMP-1, COX-2 and IL-1β expression in synovium decreased depending upon the severity of OA, while the TGF-β expression increased.
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Acknowledgement
We wish to thank Dr. Takayuki Kawasaki, Dr. Hiroshi Ikeda, Dr. Yuji Takazawa, Dr. Yoshitomo Saita, and Dr. Yuta Kimura for their helpful comments.
This study was partially supported by grants from the High Technology Research Center Grant from the Ministry of Education, Culture, Sports, Science and Technology of Japan, and from the Takeda Science Foundation (to M.I.).
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All authors report no conflicts of interest.
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Liang Ning, Muneaki Ishijima and Haruka Kaneko contributed equally to this study.
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Ning, L., Ishijima, M., Kaneko, H. et al. Correlations between both the expression levels of inflammatory mediators and growth factor in medial perimeniscal synovial tissue and the severity of medial knee osteoarthritis. International Orthopaedics (SICOT) 35, 831–838 (2011). https://doi.org/10.1007/s00264-010-1045-1
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DOI: https://doi.org/10.1007/s00264-010-1045-1