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Follicular regulatory T cells (Tfr) restrict development of autoantibodies and autoimmunity while supporting high-affinity foreign antigen-specific humoral response. However, whether Tfr can directly repress germinal center (GC) B cells that acquire autoantigens is unclear. Moreover, TCR specificity of Tfr to self-antigens is not known. Our study suggests that nuclear proteins contain antigens specific to Tfr. Targeting of these proteins to antigen-specific B> cells in mice triggers rapid accumulation of Tfr with immunosuppressive characteristics. Tfr then exert negative regulation of GC B cells with predominant inhibition of the nuclear protein-acquiring GC B cells, suggesting an important role of direct cognate Tfr-GC B cells interactions for the control of effector B cell response. © 2023, Ke et al.

Citation

Fang Ke, Zachary L Benet, Mitra P Maz, Jianhua Liu, Alexander L Dent, Joanne Michelle Kahlenberg, Irina L Grigorova. Germinal center B cells that acquire nuclear proteins are specifically suppressed by follicular regulatory T cells. eLife. 2023 Mar 02;12

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PMID: 36862132

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