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- W2012093737 abstract "Fibroblast-like synoviocytes (FLSs) of patients with rheumatoid arthritis (RA FLSs) exhibit prosurvival, rather than apoptotic, response to tumor necrosis factor (TNF)-alpha stimulation. Here, we show that JAB1 is a critical regulator of the TNF-alpha-mediated anti-apo-ptosis pathways in RA FLSs. We found that knockdown of JAB1 using small interfering (si)RNA led to restoration of the TNF-alpha-induced apoptosis response, reduction of nuclear factor-kappaB activity, delayed degradation of IkappaB-alpha, and inhibited phosphorylation of JNK. Analysis of the interactions of JAB1 by reciprocal co-immunoprecipitations and confocal microscopy revealed that JAB1 interacts with TNF receptor-associated-factor 2 (TRAF2). The generation of the anti-apoptotic signal on binding of TNF-alpha to the TNF receptor (TNFR)1 has been shown to be associated with the recruitment of TRAF2 to the TNFR1 in a process that requires ubiquitination of TRAF2 with lysine-63-linked polyubiquitin chains. We found that TNF-alpha stimulation of JAB1 siRNA-transfected RA FLSs failed to stimulate ubiquitination of TRAF2. Thus, we conclude that JAB1-regulated ubiquitination of TRAF2 is a novel mechanism whereby TNF-alpha can induce anti-apoptosis signaling and production of matrix metalloproteinases through activation of nuclear factor-kappaB and JNK in RA FLSs." @default.
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- W2012093737 date "2006-09-01" @default.
- W2012093737 modified "2023-09-23" @default.
- W2012093737 title "JAB1 Determines the Response of Rheumatoid Arthritis Synovial Fibroblasts to Tumor Necrosis Factor-α" @default.
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- W2012093737 doi "https://doi.org/10.2353/ajpath.2006.051161" @default.
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