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Learn MoreA better understanding of the mechanisms involved in human plasma cell differentiation will accelerate therapeutic target identification in autoantibody-mediated diseases such as Systemic Lupus Erythematosus (SLE). Here, we describe a novel CXCR5- CXCR3+ PD1hi CD4+ T cell helper population distinct from follicular helper T cells (Tfh) and expanded in blood and inflamed kidneys of SLE patients. Upon activation, these cells express IFNand high levels of IL10. Additionally, they accumulate high amounts of mitochondrial ROS (mtROS) as the result of reverse electron transport (RET) fueled by succinate. These cells provide potent help to B cells through the synergistic effect of IL10 and succinate. Cells with similar phenotype and function are generated in vitro upon priming nave CD4+ T cells with oxidized mitochondrial DNA (Ox mtDNA)-activated plasmacytoid dendritic cells (pDCs) in a PD1-dependent manner. Our results provide a novel mechanism for the initiation and/or perpetuation of extrafollicular humoral responses in SLE. SOURCE: Nicole Baldwin BIIR
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