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Interleukin (IL)-1β-induced cytokine secretion from synovial fluid-derived mesenchymal stem cells (SFMSCs) requires nuclear factor-κB (NF-κB). (A) In culture medium without cell growth, (B) without IL-1β stimulation, (C) following stimulation with 10 ng/ml IL-1β, (D) following a 1 h pre-incubation with 10 μM BAY11-7082 (NF-κB inhibitor) prior to the addition of 10 ng/ml IL-1β.
