Pro-inflammatory cytokines, such as interleukin-1 (IL-1) and tumor necrosis factor (TNF), can induce cartilage degradation after acute injury or in inflammatory diseases [1,2,3,7]. The degradative events are coordinated through the elevation and activation of two classes of enzymes, namely matrix metalloproteinases (MMPs) and aggrecanases (ADAMTS-4 and −5) [1,6]. Prior studies suggested that pro-inflammatory responses induced by IL-1β can be inhibited by tensile load  and more recently by cyclic compression . It is, however, not clear whether load affects other cytokines, such as TNF-α. TNF-α is known to bind its receptor (TNFR1) to cause a cascade that ends with degradation of an inhibitor, IκBα, and release of the transcription factor NF-κB . The actions of TNF-α are also known to be affected by at least three NF-κB independent pathways including the p38, ERK, and JNK pathways . The objective of this study was to determine whether cyclic compression could affect TNF-α induced cartilage degradation and to determine the roles of p38, ERK, and JNK pathways in TNF-induced cartilage degradation. We hypothesized that cyclic loading would inhibit the degradative effects caused by TNF-α.
Load Down-Regulates TNF-Alpha Induced Cartilage Degradation in Part Through NF-KB and P38 Pathways
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Wolfe, VM, Park, S, Tomic, M, Torzilli, PA, & Chen, CTC. "Load Down-Regulates TNF-Alpha Induced Cartilage Degradation in Part Through NF-KB and P38 Pathways." Proceedings of the ASME 2007 Summer Bioengineering Conference. ASME 2007 Summer Bioengineering Conference. Keystone, Colorado, USA. June 20–24, 2007. pp. 819-820. ASME. https://doi.org/10.1115/SBC2007-176541
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