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Circulating Human CD27-IgA+ Memory B Cells Recognize Bacteria with Polyreactive Igs.


ABSTRACT: The vast majority of IgA production occurs in mucosal tissue following T cell-dependent and T cell-independent Ag responses. To study the nature of each of these responses, we analyzed the gene-expression and Ig-reactivity profiles of T cell-dependent CD27(+)IgA(+) and T cell-independent CD27(-)IgA(+) circulating memory B cells. Gene-expression profiles of IgA(+) subsets were highly similar to each other and to IgG(+) memory B cell subsets, with typical upregulation of activation markers and downregulation of inhibitory receptors. However, we identified the mucosa-associated CCR9 and RUNX2 genes to be specifically upregulated in CD27(-)IgA(+) B cells. We also found that CD27(-)IgA(+) B cells expressed Abs with distinct Ig repertoire and reactivity compared with those from CD27(+)IgA(+) B cells. Indeed, Abs from CD27(-)IgA(+) B cells were weakly mutated, often used Ig? chain, and were enriched in polyreactive clones recognizing various bacterial species. Hence, T cell-independent IgA responses are likely involved in the maintenance of gut homeostasis through the production of polyreactive mutated IgA Abs with cross-reactive anti-commensal reactivity.

SUBMITTER: Berkowska MA 

PROVIDER: S-EPMC4595932 | biostudies-literature | 2015 Aug

REPOSITORIES: biostudies-literature

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Circulating Human CD27-IgA+ Memory B Cells Recognize Bacteria with Polyreactive Igs.

Berkowska Magdalena A MA   Schickel Jean-Nicolas JN   Grosserichter-Wagener Christina C   de Ridder Dick D   Ng Yen Shing YS   van Dongen Jacques J M JJ   Meffre Eric E   van Zelm Menno C MC  

Journal of immunology (Baltimore, Md. : 1950) 20150706 4


The vast majority of IgA production occurs in mucosal tissue following T cell-dependent and T cell-independent Ag responses. To study the nature of each of these responses, we analyzed the gene-expression and Ig-reactivity profiles of T cell-dependent CD27(+)IgA(+) and T cell-independent CD27(-)IgA(+) circulating memory B cells. Gene-expression profiles of IgA(+) subsets were highly similar to each other and to IgG(+) memory B cell subsets, with typical upregulation of activation markers and dow  ...[more]

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