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(F) WCEs from Ripk3 +/+ and Ripk3 −/− BMDCs treated with 100 ng/ml LPS for 2 hours were subjected to immunoprecipitation with anti-RelB antibody followed by western blot analyses. Representative pictures of cytoplasmic (top) and nuclear (bottom) RelB localization is shown on the right. (E) BMDCs stimulated with 100 ng/ml LPS for 2 hours were subjected to intracellular staining for RelB (n=8). (C) Whole cell extracts (WCE) and (D) nuclear extracts from BMDCs treated with 100 ng/ml LPS were subjected to western blot analyses. The results were pooled from two independent experiments. Gene expression in Ripk3 −/− PBS control was defined as 1. Cytokine expression in the colon on day7 is shown. PBS was injected into control mice ( Ripk3 +/+: n=14, Ripk3 −/−: n=8). (B) Ripk3 +/+ (WT: n=10) or Ripk3 −/− (KO: n=8) BMDCs were injected to Ripk3 −/− mice on day 5.
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(A) IL-23 and IL-1β secretion by BMDCs treated with LPS for 6 hours (n=4). These results reveal an unexpected function of RIPK3 in NF-κB activation, DC biology, innate inflammatory-cytokine expression, and injury-induced tissue repair. Ripk3(-/-) mice exhibited an impaired axis of injury-induced IL-1β, IL-23, and IL-22 cytokine cascade, which was partially corrected by adoptive transfer of wild-type DCs, but not Ripk3(-/-) DCs. This DC-specific function of RIPK3 was critical for injury-induced inflammation and tissue repair in response to dextran sodium sulfate (DSS). These effects were caused by impaired NF-κB subunit RelB and p50 activation and by impaired caspase 1-mediated processing of interleukin-1β (IL-1β). Ripk3(-/-) bone-marrow-derived dendritic cells (BMDCs) were highly defective in lipopolysaccharide (LPS)-induced expression of inflammatory cytokines. Here we showed that RIPK3 controls a separate, necrosis-independent pathway of inflammation by regulating cytokine expression in dendritic cells (DCs). Programmed necrosis or necroptosis is an inflammatory form of cell death that critically requires the receptor-interacting protein kinase 3 (RIPK3).