克隆性造血中的MYD88突变促进炎症和造血干细胞扩张
bioRxiv : the preprint server for biology
|July 16, 2025
概括
MYD88突变通过激活血液构造干细胞和原生细胞 (HSPCs) 中的先天免疫通路来驱动不确定潜力的克隆性血液构造 (CHIP). 这导致炎症和血液病,扩大了CHIP的理解,超出了常见的突变.
科学领域:
- 血液学 血液学 血液学
- 分子生物学分子生物学
- 免疫学 免疫学 免疫学
背景情况:
- 不确定的潜力的克隆性造血 (CHIP) 涉及突变的造血干细胞和原始细胞 (HSPC) 的扩张,增加慢性疾病和癌症风险.
- 常见的CHIP突变包括DNMT3A,TET2和ASXL1,但较少频繁的突变的作用尚不清楚.
研究的目的:
- 调查MYD88突变在CHIP中的作用.
- 了解MYD88突变在HSPC中的功能后果.
主要方法:
- 对来自普通人口和癌症患者的血细胞中MYD88突变的分析.
- 在小鼠中使用Myd88 L252P建模MYD88 CHIP.
- Myd88 L252P HSPCs 的单细胞RNA测序.
- 用IRAK1/4抑制剂进行治疗.
主要成果:
- 在CHIP中发现了MYD88突变,激活NF-κB信号传递.
- Myd88 L252P表达赋予HSPCs竞争优势,导致骨髓偏差和炎症.
- 单细胞RNA测序揭示了Myd88 L252P HSPCs中不同细胞群的扩张和免疫通路的激活.
- 抑制IRAK1/4抑制了NF-κB并逆转了Myd88 L252P细胞扩张.
结论:
- MYD88突变通过功能获取活动为CHIP做出贡献.
- MYD88突变激活HSPCs的先天性免疫路径,导致炎症性疾病.
- 针对MYD88-NF-κB通路可能为MYD88相关的CHIP提供治疗策略.
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