Enhanced BCR signaling inflicts early plasmablast and germinal center B cell death.

Enhanced BCR signaling inflicts early plasmablast and germinal center B cell death.
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DOI:
10.1016/j.isci.2021.102038
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发表时间:
2021-02-19
期刊:
影响因子:
5.8
通讯作者:
Toellner KM
Toellner KM
中科院分区:
综合性期刊2区
文献类型:
--
作者:
Yam-Puc JC;Zhang L;Maqueda-Alfaro RA;Garcia-Ibanez L;Zhang Y;Davies J;Senis YA;Snaith M;Toellner KM

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目前尚不清楚 B 细胞受体 (BCR) 信号强度如何影响浆细胞 (PC) 和生发中心 (GC) B 细胞分化。我们生成了 Cγ1Cre/wtPtpn6fl/fl 小鼠,其中 BCR 信号传导的负调节因子 SHP-1 在 B 细胞激活后迅速删除。尽管T依赖性抗原免疫增加了BCR信号传导,但它导致PC减少和细胞凋亡增加。根据抗原的不同,早期 GC B 细胞反应同样降低,细胞凋亡增加。同时,较高比例的GC B细胞表达cMYC,表明GC B细胞与Tfh细胞的相互作用可能增加。 GC B 细胞数量在后期恢复正常,而亲和力成熟则长期受到抑制。这证实了 BCR 信号传导不仅指导亲和力依赖性 B 细胞选择,而且在没有足够的进一步刺激的情况下,可以造成细胞死亡,这对于维持 B 细胞耐受性可能很重要。 BCR 信号传导如果没有足够的进一步刺激,可能会导致细胞死亡 不适当的 BCR 信号传导会抑制滤泡外 PC 分化 BCR 信号传导增强会诱导早期 GC B 细胞凋亡 BCR 信号传导强度会影响亲和力依赖性 B 细胞选择免疫系统;细胞生物学
It is still not clear how B cell receptor (BCR) signaling intensity affects plasma cell (PC) and germinal center (GC) B cell differentiation. We generated Cγ1Cre/wtPtpn6fl/fl mice where SHP-1, a negative regulator of BCR signaling, is deleted rapidly after B cell activation. Although immunization with T-dependent antigens increased BCR signaling, it led to PC reduction and increased apoptosis. Dependent on the antigen, the early GC B cell response was equally reduced and apoptosis increased. At the same time, a higher proportion of GC B cells expressed cMYC, suggesting GC B cell-Tfh cell interactions may be increased. GC B cell numbers returned to normal at later stages, whereas affinity maturation was suppressed in the long term. This confirms that BCR signaling not only directs affinity-dependent B cell selection but also, without adequate further stimulation, can inflict cell death, which may be important for the maintenance of B cell tolerance. BCR signaling without adequate further stimulation can inflict cell death Inappropriate BCR signaling can inhibit extra-follicular PC differentiation Increased BCR signaling induces apoptosis in early GC B cells BCR signaling intensity affects affinity-dependent B cell selection Immunology; immune system; cell biology
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