炎症体传感器NLRP3与REV7相互作用,通过同源重组保持基因组完整性
Delphine Burlet1,2,3,4, Md Muntaz Khan1,2,3,4, Sabine Hacot1,2,3,4
1INSERM U1052, Centre de Recherche en Cancérologie de Lyon, F-69000 Lyon, France.
Nucleic acids research
|July 4, 2025
概括
炎症体传感器NLRP3促进DNA修复途径的选择,以保持基因组的稳定性. 虽然NLRP3缺乏会损害同源重组,增加对PARP抑制剂的敏感性,但REV7损失会恢复这种修复途径.
科学领域:
- 分子生物学分子生物学
- DNA 修复机制的修复机制
- 具有天生的免疫力.
背景情况:
- DNA双链断裂 (DSB) 是关键的DNA病变,可能导致基因组不稳定性和癌症.
- DSB修复通过非同源末端连接 (NHEJ) 或同源重组 (HR) 发生,而途径选择受到DNA末端切除的影响.
- 盾子复合物抑制了切除,有利于NHEJ.
研究的目的:
- 调查炎酶传感器NLRP3在调节DNA双链断裂修复路径选择中的作用.
- 阐明NLRP3影响同源重组 (HR) 效率的机制.
- 确定NLRP3在DSB修复中的作用的治疗影响,特别是关于PARP抑制剂 (PARPi) 的治疗影响.
主要方法:
- 在具有和没有NLRP3的细胞中使用RAD51焦点形成和功能HR测定来评估HR效率3.
- 研究了NLRP3和REV7之间的相互作用,这是shieldin复合物的组成部分.
- 评估了NLRP3缺乏细胞对Poly-ADP-ribose聚合酶 (PARP) 抑制剂 (PARPi) 的敏感性及其与BRCA1缺乏和REV7状态的关系.
主要成果:
- NLRP3促进DNA末端切除,从而促进同源重组 (HR) 途径以炎酶体独立的方式.
- NLRP3的枯竭显著降低了HR的效率,并增加了对PARP抑制剂 (PARPi) 的敏感性,反映了HR缺乏的癌细胞.
- NLRP3与REV7相互作用,其缺失导致REV7对DSB的招聘增加,损害了HR. 在NLRP3枯竭的细胞中,REV7的丧失会恢复HR,并赋予PARPi抗性.
结论:
- NLRP3在促进DNA末端切除和有利于HR途径进行DSB修复方面发挥着关键作用,独立于其炎症酶功能.
- 由于HR受损,NLRP3缺乏会使细胞对PARP抑制剂 (PARPi) 产生敏感性,突显出潜在的治疗脆弱性.
- 在调节DSB修复路径选择方面,NLRP3和REV7之间的相互作用为维护基因组完整性和开发癌症疗法提供了新的见解.
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