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Deprecated: Implicit conversion from float 263.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Immunity 2017 ; 47 (1): 118-134.e8 Nephropedia Template TP
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Human Secretory IgM Emerges from Plasma Cells Clonally Related to Gut Memory B Cells and Targets Highly Diverse Commensals #MMPMID28709802
Magri G; Comerma L; Pybus M; Sintes J; Lligé D; Segura-Garzón D; Bascones S; Yeste A; Grasset EK; Gutzeit C; Uzzan M; Ramanujam M; van Zelm MC; Albero-González R; Vazquez I; Iglesias M; Serrano S; Márquez L; Mercade E; Mehandru S; Cerutti A
Immunity 2017[Jul]; 47 (1): 118-134.e8 PMID28709802show ga
Secretory immunoglobulin A (SIgA) enhances host-microbiota symbiosis, whereas SIgM remains poorly understood. We found that gut IgM+ plasma cells (PCs) were more abundant in humans than mice and clonally related to a large repertoire of memory IgM+ B cells disseminated throughout the intestine but rare in systemic lymphoid organs. In addition to sharing a gut-specific gene signature with memory IgA+ B cells, memory IgM+ B cells were related to some IgA+ clonotypes and switched to IgA in response to T cell-independent or T cell-dependent signals. These signals induced abundant IgM which, together with SIgM from clonally affiliated PCs, recognized mucus-embedded commensals. Bacteria recognized by human SIgM were dually coated by SIgA and showed increased richness and diversity compared to IgA-only-coated or uncoated bacteria. Thus, SIgM may emerge from pre-existing memory rather than newly activated naive IgM+ B cells and could help SIgA to anchor highly diverse commensal communities to mucus.