Activated monocytes can induce γδ T and mast cells to release IL-17 or activate Th17 cells.216 Plasmacytoid dendritic cells activate Th17 cells to secrete IL-17 by secreting large amounts of IFNγ antigen-presenting cells.216–220 In addition, Ma et al. showed that upon stimulation with IL-17A (IL-17), a significant subset of IL-17 receptor-expressing plasma cells produced strong anti-double-strand DNA IgG in such patients and murine lupus models. Here, IL17A is linked to systemic lupus erythematosus.