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Systemic autoimmunity owing to overactivity of Tfh and dysregulated germinal centers has been described in mice and humans. Cytokines such as IL-21, IFN-γ, IL-6 and IL-17 are elevated in the plasma of mouse models of lupus, arthritis, and multiple sclerosis, and in subsets of patients with autoimmune disease. Monoclonal antibodies targeting these cytokines are entering clinical trials. While these...
On the lupus-prone MRL-lpr/lpr (MRL-lpr) background, AM14 rheumatoid factor (RF) B cells are activated, differentiate into plasmablasts, and undergo somatic hypermutation outside of follicles. Using multiple strategies to impair T cells, we found that such AM14 B cell activation did not require T cells but could be modulated by them. In vitro, the signaling adaptor MyD88 is required for IgG anti-chromatin...
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