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The quantity of CD40 signaling determines the differentiation of B cells into functionally distinct memory cell subsets.

ABSTRACT: In mice, memory B (Bmem) cells can be divided into two subpopulations: CD80hi Bmem cells, which preferentially differentiate into plasma cells; and CD80lo Bmem cells, which become germinal center (GC) B cells during a recall response. We demonstrate that these distinct responses can be B-cell-intrinsic and essentially independent of B-cell receptor (BCR) isotypes. Furthermore, we find that the development of CD80hi Bmem cells in the primary immune response requires follicular helper T cells, a relatively strong CD40 signal and a high-affinity BCR on B cells, whereas the development of CD80lo Bmem cells does not. Quantitative differences in CD40 stimulation were enough to recapitulate the distinct B cell fate decisions in an in vitro culture system. The quantity of CD40 signaling appears to be translated into NF-?B activation, followed by BATF upregulation that promotes Bmem cell differentiation from GC B cells.

SUBMITTER: Koike T

PROVIDER: S-EPMC6636905 | biostudies-literature | 2019 Jun

REPOSITORIES: biostudies-literature

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The quantity of CD40 signaling determines the differentiation of B cells into functionally distinct memory cell subsets.

Koike Takuya T Harada Koshi K Horiuchi Shu S Kitamura Daisuke D

eLife 20190621

In mice, memory B (Bmem) cells can be divided into two subpopulations: CD80hi Bmem cells, which preferentially differentiate into plasma cells; and CD80lo Bmem cells, which become germinal center (GC) B cells during a recall response. We demonstrate that these distinct responses can be B-cell-intrinsic and essentially independent of B-cell receptor (BCR) isotypes. Furthermore, we find that the development of CD80hi Bmem ...[more]

PMID: 31225793

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