IL-7受体信号驱动人类B细胞原始体的分化和扩张
Fabian M P Kaiser1, Iga Janowska2,3, Roberta Menafra4
1Department of Immunology, Erasmus University Medical Center, Rotterdam, The Netherlands.
Blood
|June 27, 2023
概括
介素-7受体α (IL-7Rα) 信号传递对人类B细胞发育至关重要,驱动早期前代细胞扩张和B淋巴细胞命运. 这一发现与小鼠模型形成鲜明对比,影响了对免疫缺陷和白血病的理解.
科学领域:
- 免疫学 免疫学 免疫学
- 发展生物学 发展生物学
- 细胞生物学 细胞生物学
背景情况:
- 在小鼠中缺少互白素-7 (IL-7) 信号,就会阻止T和B淋巴细胞形成.
- 严重综合免疫缺陷的人类IL-7受体α (IL-7Rα) 的突变不会完全废除B细胞的产生,这表明它与IL-7信号独立.
- 以前的理解假定人类B淋巴发育是独立于IL-7.
研究的目的:
- 为了研究IL-7受体α (IL-7Rα) 信号传递在人类B型淋巴发育中的作用.
- 为了澄清关于IL-7依赖的小鼠和人类B细胞发育之间的差异.
- 阐明IL-7信号传递在早期人类B细胞前体发育中的特定功能.
主要方法:
- 骨髓样本的流动细胞计分析.
- 从健康对照组和IL-7Rα缺乏患者的骨髓单细胞RNA测序.
- 在人体B细胞分化的体外建模.
主要成果:
- IL-7Rα信号传递对于早期人类B细胞祖先的增殖和扩张至关重要.
- IL-7Rα信号增强了促进B淋巴细胞命运的关键转录因子 (BACH2,EBF1,PAX5) 的表达.
- 缺少IL-7Rα导致早期B细胞原始体中髓状细胞特异基因的表达,这表明血统承诺受损.
- 在较晚的B细胞阶段,IL-7Rα信号传递在防止细胞死亡方面发挥着有限的作用.
结论:
- IL-7受体α (IL-7Rα) 信号传递在人类B型淋巴细胞发生过程中起着至关重要的,以前未知的作用.
- IL-7Rα信号传递促进了B淋巴细胞的命运,并扩大了早期人类B细胞的祖先,突出了物种间的差异.
- 这些发现对治疗T-B+严重综合免疫缺陷和理解与IL-7R信号传递相关的白血病发生有意义.
相关概念视频
B Cell Activation and Differentiation
1.8K
The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
1.8K
T Cell Types and Functions
1.1K
When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
1.1K
Differentiation of Common Myeloid Progenitor Cells
3.2K
Common myeloid progenitors (CMPs) are oligopotent cells that can differentiate into granulocytes and macrophages. Granulocytes and macrophages are essential for protecting the body against bacterial, viral, or fungal infections. They migrate from the bone marrow into the circulating blood to reach specific tissue sites where they differentiate and help in immune surveillance. However, they survive only for a few days and must be continuously made available to the organism to maintain a robust...
3.2K
Cells of the Adaptive Immune Response
1.1K
The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...
1.1K
Lineage Commitment
3.0K
Commitment is the process whereby stem cells:
3.0K


