逆转移子被选择来激活造血干细胞和红细胞形成
Julia Phan1, Brandon Chen1, Zhiyu Zhao1
1Children's Research Institute and the Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
Science (New York, N.Y.)
|October 24, 2024
概括
在怀孕期间和流血后,逆转移素会激活免疫传感器,促进干细胞的分裂和红细胞的产生. 这一途径对于哺乳动物的造血至关重要.
科学领域:
- 免疫学
- 血液学
- 遗传学
背景情况:
- 造血干细胞 (HSC) 和红细胞形成对于红细胞的产生至关重要.
- 怀孕和流血引发了血液形成的显著生理变化.
- 逆转录子是移动的遗传元素,越来越多地被认可为它们超越基因组动态的作用.
研究的目的:
- 研究逆转移体和先天免疫通路在妊娠期间和出血后调节的作用.
- 确定循环素3',5'-单酸-氨酸5'-单酸合成酶 (cGAS) 和干扰素 (IFN) 基因 (STING) 途径的激活是否会影响HSC功能.
- 探索老鼠与人类之间的保护机制.
主要方法:
- 从怀孕和非怀孕小鼠的造血干细胞 (HSCs) 中对逆转移素脱压和转录的分析.
- 评估对逆转移素活性的先天免疫传感器激活 (cGAS-STING通路).
- 在小鼠模型中使用逆转录酶抑制剂和遗传缺陷 (cGAS,STING) 的实验操纵.
- 血液形成的评估,包括血小板细胞,红细胞前代和红细胞计数.
- 在怀孕期间与人类HSCs的小鼠模型中的发现和逆转录酶抑制剂使用的临床数据的比较.
主要成果:
- 在怀孕期间和出血后,HSC的转录,包括内源性逆转录病毒和长间隔的核元素,是上调的.
- 激活的逆转移素会触发cGAS-STING先天性免疫通路,导致干扰素的产生和增加HSC分裂和红色形成.
- 在怀孕的小鼠中抑制逆转录酶或cGAS/ STING缺陷损害了HSC和红质形成,但在非怀孕的小鼠中影响很小.
- 在小鼠出血后和怀孕期间观察到类似的逆转移子和干扰素调节基因.
- 临床数据显示,孕妇使用逆转录酶抑制剂与贫血之间存在关联,但非孕妇则没有.
结论:
- 在怀孕和流血期间,cGAS- STING通路的逆转移素激活是增强HSC分裂和红色形成的关键机制.
- 在哺乳动物的生理压力下,这种逆转移素与先天免疫轴对于维持强大的血液形成至关重要.
- 这些发现表明从小鼠到人类的保护机制,突出了与怀孕相关的贫血的潜在治疗点.
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