Marginal zone SIGN-R1⁺ macrophages are essential for the maturation of germinal center B cells in the spleen.

The mechanisms that regulate germinal center (GC) B cell responses in the spleen are not fully understood. Here we use a combination of pharmacologic and genetic approaches to delete SIGN-R1⁺ marginal zone (MZ) macrophages and reveal their specific contribution to the regulation of humoral immunity in the spleen. We find that while SIGN-R1⁺ macrophages were not essential for initial activation of B cells, they were required for maturation of the response and development of GC B cells. These defects could be corrected when follicular helper T (Tfh) cells were induced before macrophage ablation or when Tfh responses were enhanced. Moreover, we show that in the absence of SIGN-R1⁺ macrophages, DCIR2⁺ dendritic cells (DCs), which play a key role in priming Tfh responses, were unable to cluster to the interfollicular regions of the spleen and were instead displaced to the MZ. Restoring SIGN-R1⁺ macrophages to the spleen corrected positioning of DCIR2⁺ DCs and rescued the GC B cell response. Our study reveals a previously unappreciated role for SIGN-R1⁺ macrophages in regulation of the GC reaction and highlights the functional specification of macrophage subsets in the MZ compartment. Copyright © 2020 the Author(s). Published by

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