ATF4-RPS19BP1轴调节核糖体生物发生,以促进红色素形成
Zhaofeng Zheng1,2, Shangda Yang1,3, Fanglin Gou4
1State Key Laboratory of Experimental Hematology, National Clinical Research Center for Blood Diseases, Haihe Laboratory of Cell Ecosystem, Institute of Hematology and Blood Diseases Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin, China.
Blood
|April 24, 2024
概括
激活转录因子4 (ATF4) 对于红细胞的产生至关重要. 血液细胞中ATF4缺乏会通过破坏核糖体生物发生来损害红细胞形成,从而导致贫血.
科学领域:
- 血液学 血液学 血液学
- 分子生物学分子生物学
- 干细胞生物学 干细胞生物学
背景情况:
- 造血分化是由内在因素和骨髓 (BM) 利基调节的.
- 激活转录因子4 (ATF4) 对于造血干细胞的维护至关重要.
- 在BM利基中的ATF4的特定作用及其在成年人血液形成中的机制尚未完全理解.
研究的目的:
- 研究ATF4在利基细胞中的功能及其在成年人血液形成中的作用.
- 阐明ATF4调节红细胞生成的分子机制.
主要方法:
- 在小鼠中使用Cre-lox技术,在特定的细胞类型 (内皮细胞,肌层细胞,骨质生殖细胞,造血细胞) 中条件淘汰Atf4.
- 在淘汰赛模型中分析血液构成分化和红色构成.
- 调查ATF4的监管目标,包括Rps19bp1,以及它们在核糖体生物发生中的作用.
主要成果:
- 在BM小区细胞中Atf4的耗尽并没有影响造血.
- 缺少ATF4的造血细胞表现出缺陷的红细胞分化,导致低可塑性贫血.
- ATF4直接调节Rps19bp1转录,这对于40S核糖体子单元组合和红色素形成至关重要.
- 由于核糖体生物生成受损,ATF4的枯竭阻碍了在压力条件下的造血复苏.
结论:
- ATF4对于红细胞形成是不可或缺的,它在血液细胞内内在地起作用.
- ATF4-RPS19BP1轴是核糖体生物发生和红细胞生成的关键调节器.
- 通过ATF4调解的有效核糖体生物发生对于造血复苏至关重要.
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