Integrin CD11b provides a new marker of pre-germinal center IgA+ B cells in murine Peyer's patches.

Integrin CD11b provides a new marker of pre-germinal center IgA+ B cells in murine Peyer's patches.
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整合素CD 11 B为小鼠派伊尔集合淋巴结中的前生殖中心伊加+ B细胞提供了新的标记物。

DOI:
10.1093/intimm/dxab113
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发表时间:
2022-04-20
影响因子:
4.4
通讯作者:
Shinkura, Reiko
Shinkura, Reiko
中科院分区:
医学3区
文献类型:
--
作者:
Gao, Peng;Adachi, Takahiro;Okai, Shinsaku;Morita, Naoki;Kitamura, Daisuke;Shinkura, Reiko

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活化的B细胞可以进入生发中心(GC)进行亲和力成熟以产生高亲和力抗体。然而,哪些激活的B细胞将进入GC仍然是未知的。在这里,我们发现了一个小群体的CD 11 B+伊加+ B细胞位于GC外的小鼠派伊尔氏集结(PP)。在将CD 11 B+伊加+ PP B细胞注射到受体小鼠的PP中后,它们在40小时后进入GC。它们表达GC表面标志物和前GC B细胞基因,表明CD 11 B为小鼠PP中前GC伊加+ B细胞提供了新的表面标志物。此外,不依赖于树突状细胞活化,B细胞上的CD 11 B b表达可由细菌抗原如pam3 CSK 4和热灭活的大肠杆菌在体外诱导。此外,小鼠口服pam3CSK 4或热灭活E.大肠杆菌在两天内增加PP GC B细胞的数量,并增强粘膜抗原特异性伊加反应。我们的研究结果表明,诱导B细胞上的CD 11 B是一个有前途的标记,用于选择一个有效的粘膜疫苗佐剂。CD11b在生殖中心反应中的关键作用
Activated B cells can enter germinal centers (GCs) for affinity maturation to produce high-affinity antibodies. However, which activated B cells will enter GCs remains unknown. Here, we found a small population of CD11b+IgA+ B cells located outside of GCs in murine Peyer’s patches (PPs). After injection of the CD11b+IgA+ PP B cells into a PP of a recipient mouse, they entered GCs forty hours later. They expressed GC surface markers and pre-GC B cell genes, suggesting that CD11b provides a novel surface marker of pre-GC IgA+ B cells in murine PPs. Furthermore, independently of dendritic cell activation, CD11b expression on B cells can be induced by bacterial antigens, such as pam3CSK4 and heat-killed Escherichia coli in vitro. In addition, mice orally administered with pam3CSK4 or heat-killed E. coli increased the number of PP GC B cells within two days, and enhanced the mucosal antigen-specific IgA response. Our results demonstrate that the induction of CD11b on B cells is a promising marker for selecting an effective mucosal vaccine adjuvant. A crucial role for CD11b in germinal-center reactions
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