Journal
CELL REPORTS
Volume 12, Issue 7, Pages 1120-1132Publisher
CELL PRESS
DOI: 10.1016/j.celrep.2015.07.021
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Funding
- University of Texas MD Anderson Cancer Center
- National Institutes of Health [AI074809, AI068129]
- Natural Science Foundation of China [31470854]
- MD Anderson's Cancer Center Support Grant from the NIH [CA016672]
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Here, we examine the mechanism by which plasmacytoid dendritic cells (pDCs) and type I interferons promote humoral autoimmunity. In an amyloid-induced experimental autoimmune model, neutrophil depletion enhanced anti-nuclear antibody development, which correlated with heightened IFN-gamma production by natural killer (NK) cells. IFN-alpha/beta produced by pDCs activated NK cells via IL-15 induction. Neutrophils released reactive oxygen species (ROS), which negatively modulated the levels of IL-15, thereby inhibiting IFN-gamma production. Mice deficient in NADPH oxidase 2 produced increased amounts of IFN-gamma and developed augmented titers of autoantibodies. Both the pDC-IFN-alpha/beta pathway and IFN-gamma were indispensable in stimulating humoral autoimmunity. Male NZB/W F1 mice expressed higher levels of superoxide than their female lupus-prone siblings, and depletion of neutrophils resulted in spontaneous NK cell and autoimmune B cell activation. Our findings suggest a regulatory role for neutrophils in vivo and highlight the importance of an NK-IFN-gamma axis downstream of the pDC-IFN-alpha/beta pathway in systemic autoimmunity.
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