这是一个重要的发育检查点,用于T细胞系的产生
Tomokatsu Ikawa1, Satoshi Hirose, Kyoko Masuda
1Laboratory for Lymphocyte Development, RIKEN Research Center for Allergy and Immunology, Yokohama 230-0045, Japan.
概括
研究人员确定了T细胞发育中最早的检查点. 减少的互白素-7水平促进了T细胞谱系的确定,这取决于转录因子Bcl11b.
科学领域:
- 免疫学 免疫学 免疫学
- 发展生物学 发展生物学
- 血液形成 血液形成 血液形成
背景情况:
- 早期的T细胞发育涉及具有多谱系潜力的祖先.
- 对于T细胞谱系承诺的分子驱动因素在很大程度上是未知的.
- 了解这些机制对于控制免疫细胞分化至关重要.
研究的目的:
- 阐明调控T细胞谱系确定最早阶段的分子机制.
- 确定调节T细胞承诺的关键因素和检查点.
- 研究Notch信号和细胞因子环境在T细胞发育中的作用.
主要方法:
- 在固定DLL4蛋白与特定的细胞因子上培养小鼠造血原体.
- 在原生培养过程中操纵interleukin-7度.
- 分析了缺乏转录因子Bcl11b.b的小鼠的胸细胞.
- 评估祖先的血统潜力和细胞周期状态.
主要成果:
- 高水平的互白素-7与诺奇配体DLL4阻断了T细胞的发育,并诱导了前代细胞的自我更新,从而保留了非T血统的潜力.
- 降低的互白素-7度有助于确定T细胞谱系.
- 转录因子Bcl11b的缺陷使得在高IL-7条件下观察到的原始基因停止和自我更新.
- 在T细胞发育开始时确定了一个Bcl11b依赖的检查点.
结论:
- 最早的T细胞发育检查点由互白素-7水平和Notch信号调节.
- 转录因子Bcl11b对于在这个早期阶段确定T细胞谱系至关重要.
- 这项研究揭示了一种新的机制,控制了早期免疫原始体的自我更新和血统承诺之间的平衡.
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