Abstract:
:Cartilage repair by transplantation of autologous chondrocytes is an option when restoring functional joints. Control of chondrocyte function is thus required. Interleukin-10 (IL-10) is a potent anti-inflammatory cytokine affecting the expression of a wide range of immune mediators in hematopoietic and non-hematopoietic cells. Previous studies indicated that IL-10 has therapeutic potential in the treatment of chronic inflammatory joint disorders such as rheumatoid arthritis and osteoarthritis. IL-10 has been found to be chondroprotective by down-regulating metalloproteinase expression and by inhibiting the synthesis of pro-inflammatory cytokines, such as IL-6, in immune cells. In contrast, the effects of IL-10 on chondrocytes are poorly understood and have to be identified with regard to their future clinical use. In this study, we investigated the effects of IL-10 on the expression of cartilage-degrading mediators in the human chondrosarcoma cell line, SW1353, after exposure to IL-1, a key mediator in cartilage and bone destruction. We found a strong induction of the pro-inflammatory cytokine, IL-6, in IL-1-exposed SW1353 cells. Surprisingly, IL-10 had no effect on IL-1-induced IL-6, pro-MMP1, and pro-MMP13 secretion. Although RT-PCR analyses demonstrated the expression of both receptor chains of the IL-10 receptor complex (IL-10R1 and IL-10R2), exposure of SW1353 to IL-10 did not lead to phosphorylation of STAT3, the major transcription factor induced by IL-10. This was not due to a defect in STAT3, because stimulation with IL-6 resulted in its phosphorylation. Failure of SW1353 cells to respond to IL-10 was consistent with a deficient surface expression of IL-10R1. From these results we conclude that IL-10 does not exert its chondroprotective character on chondrocytes directly. Furthermore, the unresponsiveness of chondrocytes towards IL-10 might explain the vulnerability of joint cartilage to inflammation.
journal_name
Int J Mol Medjournal_title
International journal of molecular medicineauthors
Radons J,Falk W,Schubert TEsubject
Has Abstractpub_date
2006-02-01 00:00:00pages
377-83issue
2eissn
1107-3756issn
1791-244Xjournal_volume
17pub_type
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