基因毒性化物应激过早衰老血造干细胞以p53驱动的方式
Meng Wang1, Laura T L Brandt2, Xiaonan Wang3
1Division of Nutritional Sciences, Cornell University, Ithaca, NY, USA; Wellcome-MRC Cambridge Stem Cell Institute, Jeffrey Cheah Biomedical Centre, University of Cambridge, Cambridge, UK; MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge, UK.
Molecular cell
|June 22, 2023
概括
代谢衍生型甲会在造血干细胞 (HSC) 中引起DNA损伤,激活p53反应并加速衰老. 这种损伤导致HSC具有老化特征和髓状细胞分化偏差.
科学领域:
- 血液学 血液学 血液学
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 衰老的造血干细胞 (HSC) 显示出自我更新的减少以及对髓状细胞分化的一种偏见.
- 驱动HSC这些与年龄相关的变化的潜在机制尚不清楚.
- HSCs产生基因毒性甲,需要通过ALDH2和ADH5进行保护性排毒,以及Fanconi贫血 (FA) DNA修复途径.
研究的目的:
- 调查甲诱导的DNA损伤和p53反应在HSC衰老中的作用.
- 阐明驱动老年HSC骨髓分化偏差的机制.
主要方法:
- 对年轻Aldh2-/-Fancd2-/-小鼠的HSC进行分析,通过单个HSC移植来检测转录组特征,表观遗传年龄,端粒长度和分化潜力.
- 在Aldh2-/-Fancd2-/- HSC中评估p53反应激活.
- 使用GFP遗传记者来识别血统偏差的HSC,特别是Vwf+骨髓和大核细胞血统偏差的HSC.
主要成果:
- 年轻的Aldh2-/-Fancd2-/- HSCs表现出衰老的转录组特征,增加的表观遗传年龄,端粒磨损和骨髓偏差差.
- 在Aldh2-/-Fancd2-/- HSC中,p53反应被显著激活.
- 删除p53挽救了老年HSC表型.
- 观察到一个引人注目的Vwf+骨髓和巨核细胞谱系偏差的HSCs的丰富.
结论:
- 在HSC中由代谢衍生的甲诱导的DNA损伤触发了p53反应.
- 这一过程驱动了HSC中加速衰老的表型,其特征是自我更新的减少和骨髓分化偏差.
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