在瘤发生过程中,MRE11从核酶封存中释放cGAS
Min-Guk Cho1, Rashmi J Kumar1,2, Chien-Chu Lin3
1Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
Nature
|January 10, 2024
概括
MRE11复合物从抑制中释放cGAS,使得DNA损伤诱导激活. 这一过程通过触发亡,突出MRE11抑制乳腺癌.
科学领域:
- 分子生物学
- 免疫学
- 癌症研究
背景情况:
- 瘤基因诱导的复制应激会导致DNA损伤,激活cGAS-STING信号以抑制瘤.
- 由内源性DNA损伤引起的cGAS激活机制尚不清楚,因为基因素结合会抑制它.
- MRE11 (微生物重组11) 是一个参与DNA修复的DNA双链断裂传感器.
研究的目的:
- 阐明MRE11在通过内源性DNA损伤调节cGAS激活中的作用.
- 研究MRE11促进cGAS激活的机制.
- 确定MRE11介导的cGAS激活在瘤抑制中的下游后果.
主要方法:
- 研究了MRE11-RAD50-NBN复合体,核细胞和cGAS之间的相互作用.
- 评估了MRE11在应对瘤性压力,dSDNA和电离辐射时的激活的必要性.
- 分析了MRE11依赖的cGAS激活在ZBP1- RIPK3- MLKL介导的亡和瘤抑制中的作用.
主要成果:
- MRE11与核细胞片段的结合将cGAS从抑制性基因素相互作用中取代,从而使dDNA依赖激活.
- MRE11对于内源DNA损伤,细胞质dDNA和电离辐射的cGAS激活是必不可少的.
- 通过MRE11调节的cGAS激活促进ZBP1- RIPK3- MLKL依赖性亡,抑制乳腺瘤发生.
结论:
- MRE11作为关键的调解器,将DNA损伤与cGAS激活联系起来.
- 通过ZBP1介导的亡,MRE11依赖的cGAS激活抑制了乳腺癌.
- 在三阴性乳腺癌中,ZBP1的降低与预后不佳相关.
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