干扰素通过ISG15恢复BRCA缺陷细胞中的复制叉稳定性和细胞活力
Ramona N Moro1, Uddipta Biswas1, Suhas S Kharat2
1University of Zurich, Institute of Molecular Cancer Research, 8057, Zurich, Switzerland.
Nature communications
|October 2, 2023
概括
干扰素刺激的15基因 (ISG15) 和它的结合 (ISGylation) 保护新生的DNA免受降解. 干扰素β (IFNβ) 治疗增强了BRCA1/2-缺陷细胞中的DNA复制叉稳定性,通过ISG15.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 免疫学 免疫学 免疫学
背景情况:
- DNA复制和修复缺陷通过干扰素 (IFN) 信号触发炎症反应.
- IFN信号传递对DNA复制本身的影响在很大程度上仍然未知.
研究的目的:
- 研究IFN信号在DNA复制和修复中的作用.
- 阐明IFN信号影响DNA复制真实性和稳定的机制.
主要方法:
- 评估ISG15和ISGylation在保护新生DNA中的作用.
- 研究了IFNβ治疗对BRCA1/2-缺陷细胞复制叉稳定性的影响.
- 研究了IFNβ介导的救援效应对拓聚酶-1的依赖.
- 在BRCA1/2-缺乏细胞中对ISG15调节的反应中分析了细胞增殖率和耐药性.
主要成果:
- 基底水平的ISG15和ISGylation对于保护新生DNA免受降解至关重要.
- IFNβ治疗恢复了BRCA1/2缺陷细胞的复制叉稳定性,这些细胞依赖于topoisomerase-1.
- ISG15和ISGylation特别调解IFNβ对DNA复制的影响,独立于其他IFN诱导的基因.
- ISG15的枯竭减少了BRCA1突变细胞的增殖,而其上调则使BRCA2缺陷细胞对西斯普拉丁产生抗性.
结论:
- ISG15和ISGylation对于保持DNA复制完整性至关重要.
- 通过ISG15传递IFNβ信号,可以挽救BRCA1/2-缺乏细胞中的复制缺陷.
- 在BRCA1/2缺乏细胞中,ISG15水平升高代表了与BRCAness相关的内在耐药性机制.
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