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- Title
Tespa1 Deficiency Dampens Thymus-Dependent B-cell activation and attenuates collagen-induced arthritis in Mice.
- Authors
Yunliang Yao; Wei Huang; Xiaoyu Li; Xiawei Li; Jin Qian; Hui Han; Hui Sun; Xiangli An; Linrong Lu; Hongxing Zhao
- Abstract
School of Medicine, Institute of Immunology, Zhejiang University, Hangzhou, China Thymocyte-expressed, positive selection-associated 1 (Tespa1) plays an important role in both T cell receptor (TCR)-driven thymocyte development and in the FcεRI-mediated activation of mast cells. Herein, we show that lack of Tespa1 does not impair B cell development but dampens the in vitro activation and proliferation of B cells induced by T cell-dependent (TD) antigens, significantly reduces serum antibody concentrations in vivo, and impairs germinal center formation in both aged and TD antigen-immunized mice. We also provide evidence that dysregulated signaling in Tespa1-deficient B cells may be linked to CD40-induced TRAF6 degradation, and subsequent effects on 1-phosphatidylinositol-4,5-bisphosphate phosphodiesterase gamma-2 (PLCγ2) phosphorylation, MAPK activation, and calcium influx. Furthermore, we demonstrate that Tespa1 plays a critical role in pathogenic B cells, since Tespa1-deficient chimeric mice showed a lower incidence and clinical disease severity of collagen-induced arthritis. Overall, our study demonstrates that Tespa1 is essential for TD B cell responses, and suggests an important role for Tespa1 during the development of autoimmune arthritis.
- Subjects
B cells; ARTHRITIS; MAST cells
- Publication
Frontiers in Immunology, 2018, p1
- ISSN
1664-3224
- Publication type
Article
- DOI
10.3389/fimmu.2018.00965