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We previously identified that autoreactive B cells from BXD2 mice can be targeted by IL-17, leading to upregulation of the expression of regulators of G-protein signaling (Rgs) genes that facilitated the development of spontaneous germinal centers. Little is known about the signaling pathway used by IL-17 to upregulate RGS. In the current study, we found that IL-17 rapidly activates the canonical NF-kappaB signaling pathway and that BXD2 B cells exhibit higher basal and activated phosphorylated p65 levels than B6 or BXD2-Il17ra(-/-) B cells. Inhibition of p65 phosphorylation downregulated RGS16 expression and abrogated the IL-17-induced chemotactic arrest of B cells in response to CXCL12. Knockdown of TNFR-associated factor 6 or NF-kappaB activator 1 in 70Z/3 pre-B cells led to decreased Rgs16 expression, indicating that both of these two genes are involved in IL-17-mediated activation of NF-kappaB signaling in B cells. These findings identify the signaling pathway regulated by IL-17 to contribute to the development of spontaneous germinal centers in autoimmune BXD2 mice.

the journal of immunology/the journal of immunology

IL-17 Activates the Canonical NF-κB Signaling Pathway in Autoimmune B Cells of BXD2 Mice To Upregulate the Expression of Regulators of G-Protein Signaling 16