B Cell Diversification Is Uncoupled from SAP-Mediated Selection Forces in Chronic Germinal Centers within Peyer's Patches.

Adi Biram, Eitan Winter, Alice E Denton, Irina Zaretsky, Bareket Dassa, Mats Bemark, Michelle A Linterman, Gur Yaari, Ziv Shulman

Cell reports 2020 Feb 11

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Antibodies secreted within the intestinal tract provide protection from the invasion of microbes into the host tissues. Germinal center (GC) formation in lymph nodes and spleen strictly requires SLAM-associated protein (SAP)-mediated T cell functions; however, it is not known whether this mechanism plays a similar role in mucosal-associated lymphoid tissues. Here, we find that in Peyer's patches (PPs), SAP-mediated T cell help is required for promoting B cell selection in GCs, but not for clonal diversification. PPs of SAP-deficient mice host chronic GCs that are absent in T cell-deficient mice. GC B cells in SAP-deficient mice express AID and Bcl6 and generate plasma cells in proportion to the GC size. Single-cell IgA sequencing analysis reveals that these mice host few diversified clones that were subjected to mild selection forces. These findings demonstrate that T cell-derived help to B cells in PPs includes SAP-dependent and SAP-independent functions. Copyright © 2020 The Authors. Published by Elsevier Inc. All rights reserved.

Citation

Adi Biram, Eitan Winter, Alice E Denton, Irina Zaretsky, Bareket Dassa, Mats Bemark, Michelle A Linterman, Gur Yaari, Ziv Shulman. B Cell Diversification Is Uncoupled from SAP-Mediated Selection Forces in Chronic Germinal Centers within Peyer's Patches. Cell reports. 2020 Feb 11;30(6):1910-1922.e5