Signatures of B Cell Receptor Repertoire Following Pneumocystis Infection.

Signatures of B Cell Receptor Repertoire Following Pneumocystis Infection.
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肺孢子虫感染后 B 细胞受体库的特征

DOI:
10.3389/fmicb.2021.636250
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发表时间:
2021
影响因子:
5.2
通讯作者:
Tong ZH
Tong ZH
中科院分区:
生物学2区
文献类型:
--
作者:
Sun H;Yang HQ;Zhai K;Tong ZH

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B细胞在宿主防御肺孢子虫感染中起重要作用。然而,B细胞受体(BCR)库在疾病进展中的特征仍不清楚。在这里,我们整合了单细胞RNA测序和单细胞BCR测序的免疫细胞从小鼠肺在未感染状态和感染后1-4周,以说明肺孢子虫感染期间的B细胞反应的动态性质。我们发现感染后浆细胞持续增加,(伊加+ IgG)与(IgD + IgM)比值升高。此外,肺孢子虫感染与以转录因子ATF 3表达升高为特征的幼稚B亚群的增加相关。克隆扩增细胞比例逐渐增加,而BCR多样性下降。浆细胞比幼稚B细胞表现出更高水平的体细胞超变。V(D)J基因的使用存在一定的偏向性,IGHV 9 -3基因的使用频率上升。总之,这些结果提供了肺孢子虫感染背景下B细胞转录变化和BCR库特征的详细图谱,这为寻找诊断生物标志物和开发潜在的免疫靶点提供了有价值的信息。
B cells play vital roles in host defense against Pneumocystis infection. However, the features of the B cell receptor (BCR) repertoire in disease progression remain unclear. Here, we integrated single-cell RNA sequencing and single-cell BCR sequencing of immune cells from mouse lungs in an uninfected state and 1–4 weeks post-infection in order to illustrate the dynamic nature of B cell responses during Pneumocystis infection. We identified continuously increased plasma cells and an elevated ratio of (IgA + IgG) to (IgD + IgM) after infection. Moreover, Pneumocystis infection was associated with an increasing naïve B subset characterized by elevated expression of the transcription factor ATF3. The proportion of clonal expanded cells progressively increased, while BCR diversity decreased. Plasma cells exhibited higher levels of somatic hypermutation than naïve B cells. Biased usage of V(D)J genes was observed, and the usage frequency of IGHV9-3 rose. Overall, these results present a detailed atlas of B cell transcriptional changes and BCR repertoire features in the context of Pneumocystis infection, which provides valuable information for finding diagnostic biomarkers and developing potential immunotherapeutic targets.
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发表时间: 2014-12-01
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影响因子: --
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