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IgA is necessary for maintaining gut homeostasis, and its production depends on microbial sampling by the gut-associated lymphoid tissue (GALT). Takayanagi and colleagues identify a novel population of mesenchymal cells in the GALT that control M cell differentiation and function of gut epithelium.
B-cell encounter with antigen is thought to result in anergy, cell death, or a productive B-cell response. Here the authors show that transient antigen acquisition can enable B-cell recruitment into productive responses or a return to a naive-like state, depending on availability of T-cell help.
Risk of infection is high after stroke, but the causes are not clear. Here the authors implicate altered beta–adrenergic signalling after stroke that results in a reduction in IgM-mediated protection by marginal zone B cells.
RNA-binding proteins (RBPs) take control of binary cell-fate 'decisions' and cellular identity in lymphoid organs, as the RBP ZFP36L1 is shown to negatively regulate the stability of the transcription factors KLF2 and IRF8 to control the maintenance, survival and localization of marginal zone B cells.