蛋白质稳定应激驱动干细胞衰老,克隆性血液形成和白血病
bioRxiv : the preprint server for biology
|December 12, 2025
概括
蛋白质稳定应激驱动血造干细胞衰老和克隆扩张. 热冲击因子1 (Hsf1) 的激活有助于干细胞衰老,但促进了白血病前的生长,将衰老与血液恶性瘤联系起来.
科学领域:
- 血液学 血液学 血液学
- 干细胞生物学 干细胞生物学
- 衰老研究研究 衰老研究
背景情况:
- 衰老是克隆性血液形成和血液性恶性瘤的主要危险因素.
- 在衰老过程中驱动干细胞行为和克隆扩张的选择性压力是鲜为人知的.
研究的目的:
- 确定血造干细胞 (HSC) 衰老和克隆进化的关键驱动因素.
- 研究蛋白质稳定和热冲击因子1 (Hsf1) 在老化HSC和白血病发生中的作用.
主要方法:
- 在老化HSC中蛋白质稳定应激的分析.
- 研究Hsf1在正常和白血病前的HSC中的功能.
- 研究HSF1损失或蛋白质稳定性破坏对突变HSC扩张和白血病发展的影响.
主要成果:
- 蛋白质稳定压力被确定为高细胞衰老和克隆进化的核心驱动因素.
- 在老化HSC中,hsf1被激活用于蛋白质稳定和自我更新,但被白血病前Dnmt3a突变HSC所选择.
- 同时发生Dnmt3a和Nras突变的突变HSC显示出对HSf1扩张和恶性转变的高度依赖.
- 失去hsf1或破坏蛋白质稳定会损害突变原始体的扩张,延迟白血病的发病,并提高生存率.
结论:
- 蛋白质稳定在衰老的造血系统中起到选择性约束作用,造成瓶.
- Hsf1激活支持衰老干细胞的生理适应和在白血病前和白血病状态下的病态克隆外生.
- 蛋白质稳定控制是将干细胞衰老,克隆造血和恶性瘤联系起来的关键机制.
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