Potent inhibition of cartilage biosynthesis by coincubation with joint capsule through an IL-1-independent pathway
Name
Grodzinsky-2009-Potent inhibition of cartilage.pdf
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1.92 MB
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Author(s)
Grodzinsky, Alan J.
Patwari, P.
Lin, S. N.
Kurz, Bodo
Cole, Ada A.
Kumar, S.
Date Issued
August 2009
Journal
Scandinavian Journal of Medicine & Science in Sports
Publisher
John Wiley & Sons, Inc.
Citation
Patwari, P. et al. “Potent inhibition of cartilage biosynthesis by coincubation with joint capsule through an IL-1-independent pathway.” Scandinavian Journal of Medicine & Science in Sports 19 (2009): 528-535. Web. 26 Oct. 2011. © John Wiley & Sons, Inc.
Version
Author's final manuscript
Abstract
The reason for the increased risk for development of osteoarthritis (OA) after acute joint trauma is not well understood, but the mechanically injured cartilage may be more susceptible to degradative mediators secreted by other tissues in the joint. To establish a model for such interactions, we coincubated bovine cartilage tissue explants together with normal joint capsule and found a profound (∼70%) reduction in cartilage proteoglycan biosynthesis. This reduction is due to release by the joint capsule of a heat-labile and non-toxic factor. Surprisingly, while cultured synovium is a canonical source of interleukin-1 (IL-1), blockade either by soluble IL-1 type II receptor (sIL-1r) or IL-1 receptor antagonist (IL-1RA) had no effect. Combined blockade of IL-1 and tumor necrosis factor α (TNF-α) also had no effect. To support the clinical relevance of the findings, we harvested joint capsule from post-mortem human knees. Human joint capsule from a normal adult knee also released a substance that caused an ∼40% decrease in cartilage proteoglycan biosynthesis. Furthermore, this inhibition was not affected by IL-1 blockade with either sIL-1r or IL-1RA. These results suggest that joint capsule tissue from a normal knee joint can release an uncharacterized cytokine that potently inhibits cartilage biosynthetic activity by an IL-1- and TNF-independent pathway.
MIT Department
Massachusetts Institute of Technology. Center for Biomedical Engineering
Massachusetts Institute of Technology. Department of Biological Engineering
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Creative Commons Attribution-Noncommercial-Share Alike 3.0
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DOI of Published Version
https://doi.org/10.1111/j.1600-0838.2009.00911.x
