| Summary: | Summary: Within lymph nodes (LNs), T follicular helper (TFH) cells help B cells to produce antibodies, which can either be protective or autoreactive. Here, we demonstrate that murine LN stromal cells (LNSCs) suppress the formation of autoreactive TFH cells in an antigen-specific manner, thereby significantly reducing germinal center B cell responses directed against the same self-antigen. Mechanistically, LNSCs express and present self-antigens in major histocompatibility complex (MHC) class II, leading to the conversion of naive CD4+ T cells into T regulatory (TREG) cells in an interleukin-2 (IL-2)-dependent manner. Upon blockade of TREG cells, using neutralizing IL-2 antibodies, autoreactive TFH cells are allowed to develop. We conclude that the continuous presentation of self-antigens by LNSCs is critical to generate antigen-specific TREG cells, thereby repressing the formation of TFH cells and germinal center B cell responses. Our findings uncover the ability of LNSCs to suppress the early activation of autoreactive immune cells and maintain peripheral tolerance. : Lymph node stromal cells influence adaptive immune cells in various ways. Nadafi et al. show that by presenting self-antigens on MHC class II, lymph node stromal cells promote the differentiation of CD4+ T cells into regulatory T cells, which are able to prevent the generation of follicular T helper cells and germinal center B cells directed against the same self-antigen. Keywords: lymph node stromal cells, T regulatory cells, T follicular helper, B cells, Tolerance
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