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Simpson-Abelson, MR;Hernandez-Mir, G;Childs, EE;Cruz, JA;Poholek, AC;Chattopadhyay, A;Gaffen, SL;McGeachy, MJ;
The CCAAT/Enhancer Binding Protein (C/EBP) transcription factor is activated by multiple inflammatory stimuli, including IL-17 and LPS, and C/EBP itself regulates numerous genes involved in inflammation. However, the role of C/EBP in driving autoimmunity is not well understood. Here, we demonstrate that Cebpb(-/-) mice are resistant to EAE. Cebpb(-/-) mice exhibited reduced lymphocyte and APC infiltration into CNS following EAE induction. Furthermore, MOG-induced Th17 cytokine production was impaired in draining LN, indicating defects in Th17 cell priming. In vitro Th17 polarization studies indicated that T cell responses are not inherently defective, instead supporting the known roles for C/EBP in myeloid lineage cell activation as the likely mechanism for defective Th17 priming in vivo. However, we did uncover an unexpected role for C/EBP in regulating ll23r expression in APCs. ChIP assays confirmed that C/EBP binds directly to the Il23r gene promoter in dendritic cells and Th17 cells. These data establish C/EBP as a key driver of autoimmune inflammation in EAE, and propose a novel role for C/EBP in regulation of IL-23R expression.