Single-cell atlas of splenocytes reveals a critical role of a novel plasma cell‒specific marker Hspa13 in antibody class-switching recombination and somatic hypermutation.

Single-cell atlas of splenocytes reveals a critical role of a novel plasma cell‒specific marker Hspa13 in antibody class-switching recombination and somatic hypermutation.
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脾细胞的单细胞图谱揭示了一种新型浆细胞特异性标记物 Hspa13 在抗体类别转换重组和体细胞超突变中的关键作用。

DOI:
10.1016/j.molimm.2021.11.014
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发表时间:
2021-11
影响因子:
3.6
通讯作者:
Wang Renxi
Wang Renxi
中科院分区:
医学3区
文献类型:
--
作者:
Zhai Bing;Liu Xiaoling;Xu Yaqi;Zhu Gaizhi;Zhou Shan;He Youdi;Wang Xiaoqian;Su Wenting;Han Gencheng;Wang Renxi

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我们之前的研究表明,热休克蛋白A家族(Hsp70)的成员13(Hspa13)可以促进浆细胞(PC)的产生和抗体的分泌。为了进一步探索 Hspa13 的表达和功能,我们结合单细胞 RNA 测序和抗原受体谱系 (BCR) 分析来表征绵羊红细胞引发的脾细胞。单细胞转录谱显示 Hspa13 在 PC 中特异性且高度表达。这些结果表明 Hspa13 是一种新型 PC 特异性标记物。就其功能而言,我们发现CD19cre介导的Hspa13条件性敲除(cKO)降低了PC中Ebi3和IL-10的表达。 Ebi3 和 IL-10 是分泌 IL-4 的 2 型辅助 T 细胞 (Th2) 激活和分化的重要因子。正如预期的那样,我们发现 Hspa13 cKO 减少了表达 IL-4 的滤泡辅助 T (Tfh2) 细胞。最后,单细胞抗原受体分析表明,Hspa13 cKO 减少了生发中心 (GC) B 细胞中 Aicda 介导的抗体类别转换重组 (CSR) 和体细胞超突变 (SHM)。总而言之,脾细胞的单细胞图谱揭示了新型 PC 特异性标记物 Hspa13 通过促进 PC 中的 Ebi3 和 IL-10 表达诱导表达 IL-4 的 Tfh2 细胞,从而在 GC B 细胞的 CSR 和 SHM 中发挥关键的间接作用。进一步探索Hspa13的表达和功能将为如何利用Hspa13治疗自身免疫性疾病提供有价值的线索。
Our previous study had shown that member 13 (Hspa13) of heat shock protein family A (Hsp70) promotes plasma cell (PC) production and antibody secretion. To further explore Hspa13 expression and function, we combined single-cell RNA-sequencing and antigen receptor lineage (BCR) analysis to characterize sheep red cell‒primed splenocytes. The single-cell transcriptional profiles revealed that Hspa13 is specifically and highly expressed in PCs. These results suggest that Hspa13 is a novel PC-specific marker. In terms of its function, we found that the CD19cre-mediated conditional knock-out (cKO) of Hspa13 reduced the expression of Ebi3 and IL-10 in PCs. Ebi3 and IL-10 are important factors in IL-4‒secreting type 2 helper T cell (Th2) activation and differentiation. As expected, we found that the Hspa13 cKO reduced IL‒4-expressing follicular helper T (Tfh2) cells. Finally, the single-cell antigen receptor analysis demonstrated that the Hspa13 cKO reduced theAicda-mediated antibody class-switching recombination (CSR) and somatic hypermutation (SHM) in germinal centers (GCs) B cells. Altogether, the single-cell atlas of splenocytes revealed a critical indirect role for the novel PC-specific marker Hspa13 in CSR and SHM in GC B cells by promoting Ebi3 and IL-10 expression in PCs to induce IL-4-expressing Tfh2 cells. Further exploration of Hspa13 expression and function will provide valuable clues for how to use Hspa13 in the treatment of autoimmune diseases.
循环浆母细胞/浆细胞:IgG4 相关疾病的潜在生物标志物。
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DOI: 10.1002/j.1460-2075.1994.tb06371.x
发表时间: 1994-03
期刊: The EMBO Journal
影响因子: --
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DOI: 10.1016/j.molimm.2019.01.009
发表时间: 2019-03-01
影响因子: 3.6
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DOI: 10.1038/35085509
发表时间: 2001-07-19
期刊: NATURE
影响因子: 64.8
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