Local BLyS production by T follicular cells mediates retention of high affinity B cells during affinity maturation.

Local BLyS production by T follicular cells mediates retention of high affinity B cells during affinity maturation.
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DOI:
10.1084/jem.20130505
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发表时间:
2014-01-13
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Cancro MP
Cancro MP
中科院分区:
其他
文献类型:
--
作者:
Goenka R;Matthews AH;Zhang B;O'Neill PJ;Scholz JL;Migone TS;Leonard WJ;Stohl W;Hershberg U;Cancro MP

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GC滤泡T细胞的BLyS表达是高效选择高亲和力GC B细胞所必需的。我们评估了B淋巴细胞刺激因子(BLyS)及其受体在生发中心(GC)反应和亲和力成熟中的作用。尽管在滤泡(FO)区域中的B细胞上保留了充足的BLyS,但GC微环境缺乏大量的BLyS。这反映了IL-21介导的GC B细胞上BLyS受体TACI(跨膜激活剂和钙调节剂和亲环蛋白配体相互作用物)的下调,从而限制了它们结合和保留BLyS的能力。在GC内,FO辅助性T细胞(TFH细胞)提供BLyS的局部来源。尽管T细胞衍生的BLyS对于正常GC细胞结构和体细胞超突变是不利的,但它对于高亲和力GC B细胞克隆的有效选择是必需的。这些发现表明,在亲和力成熟过程中,高亲和力克隆依赖于TFH衍生的BLyS的持久性。
BLyS expression by GC follicular T cells is required for the efficient selection of high-affinity GC B cells. We have assessed the role of B lymphocyte stimulator (BLyS) and its receptors in the germinal center (GC) reaction and affinity maturation. Despite ample BLyS retention on B cells in follicular (FO) regions, the GC microenvironment lacks substantial BLyS. This reflects IL-21–mediated down-regulation of the BLyS receptor TACI (transmembrane activator and calcium modulator and cyclophilin ligand interactor) on GC B cells, thus limiting their capacity for BLyS binding and retention. Within the GC, FO helper T cells (TFH cells) provide a local source of BLyS. Whereas T cell–derived BLyS is dispensable for normal GC cellularity and somatic hypermutation, it is required for the efficient selection of high affinity GC B cell clones. These findings suggest that during affinity maturation, high affinity clones rely on TFH-derived BLyS for their persistence.
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