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J Orthop Res. 2011 Sep;29(9):1320-6. doi: 10.1002/jor.21384. Epub 2011 Mar 15

Autologous protein solution inhibits MMP-13 production by IL-1? and TNF?-stimulated human articular chondrocytes.


Catabolic inflammatory cytokines are prevalent in osteoarthritis (OA). The purpose of this study was to evaluate an autologous protein solution (APS) as a potential chondroprotective agent for OA therapy. APS was prepared from platelet-rich plasma (PRP). The APS solution contained both anabolic (bFGF, TGF-?1, TGF-?2, EGF, IGF-1, PDGF-AB, PDGF-BB, and VEGF) and anti-inflammatory (IL-1ra, sTNF-RI, sTNF-RII, IL-4, IL-10, IL-13, and IFN?) cytokines but low concentrations of catabolic cytokines (IL-1?, IL-1?, TNF?, IL-6, IL-8, IL-17, and IL-18). Human articular chondrocytes were pre-incubated with the antagonists IL-1ra, sTNF-RI, or APS prior to the addition of recombinant human IL-1? or TNF?. Following exposure to inflammatory cytokines, the levels of MMP-13 in the culture medium were evaluated by ELISA. MMP-13 production stimulated in chondrocytes by IL-1? or TNF? was reduced by rhIL-1ra and sTNF-RI to near basal levels. APS was also capable of inhibiting the production of MMP-13 induced by both IL-1? and TNF?. The combination of anabolic and anti-inflammatory cytokines in the APS created from PRP may render this formulation to be a potential candidate for the treatment of inflammation in patients at early stages of OA.

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