Diverging regulation of Bach2 protein and RNA expression determine cell fate in early B cell response.

Diverging regulation of Bach2 protein and RNA expression determine cell fate in early B cell response.
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DOI:
10.1016/j.celrep.2022.111035
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发表时间:
2022-07-05
期刊:
影响因子:
8.8
通讯作者:
Huang, Chuanxin
Huang, Chuanxin
中科院分区:
生物学1区
文献类型:
--
作者:
Hu, Qianwen;Xu, Tingting;Zhang, Min;Zhang, Heng;Liu, Yongbo;Li, Hua-bing;Chen, Chiqi;Zheng, Junke;Zhang, Zhen;Li, Fubin;Shen, Nan;Zhang, Wenqian;Melnick, Ari;Huang, Chuanxin

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在初级体液反应的早期阶段,活化的 B 细胞可以分化为不同类型的效应细胞,具体取决于 B 细胞受体对抗原的亲和力。然而,控制这些过程的关键转录因子仍有待阐明。在这里,我们发现激活的 B 细胞中的转录因子 Bach2 蛋白被亲和相关信号和 mTORC1 依赖性翻译短暂诱导,以抑制其扩增和分化为浆细胞,同时促进记忆和生发中心 (GC) B 细胞的命运。亲和力相关信号还会下调活化 B 细胞及其后代记忆 B 细胞中的 Bach2 mRNA 表达。持续且较高浓度的 Bach2 会拮抗 GC 命运。记忆 B 细胞中 Bach2 的抑制使它们的细胞命运选择取决于记忆回忆。我们的研究表明,激活的 B 细胞中 Bach2 蛋白和转录本的差异动态控制着它们的细胞命运结果,并影响其后代效应细胞的命运。
During the early phase of primary humoral responses, activated B cells can differentiate into different types of effector cells, dependent on B cell receptor affinity for antigen. However, the pivotal transcription factors governing these processes remain to be elucidated. Here, we show that transcription factor Bach2 protein in activated B cells is transiently induced by affinity-related signals and mTORC1-dependent translation to restrain their expansion and differentiation into plasma cells while promoting memory and germinal center (GC) B cell fates. Affinity-related signals also down-regulates Bach2 mRNA expression in activated B cells and their descendant memory B cells. Sustained and higher concentrations of Bach2 antagonize the GC fate. Repression of Bach2 in memory B cells predisposes their cell-fate choices upon memory recall. Our study reveals that differential dynamics of Bach2 protein and transcripts in activated B cells controls their cell-fate outcomes and imprints the fates of their descendant effector cells.
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