在受限细胞迁移中的核破裂触发了核活性聚合,以限制染色质泄漏
Christos Kamaras1, Dennis Frank2, Hong Wang2,3
1Institute of Experimental and Clinical Pharmacology and Toxicology, Medical Faculty, University of Freiburg, 79104, Freiburg, Germany. christos.kamaras@pharmakol.uni-freiburg.de.
细胞迁移期间核膜破裂触发了活性蛋白的形成,加强了细胞核. 这种ATR-胺通路可以防止染色质泄漏,并保持基因组稳定性,这对于理解癌症转移至关重要.
科学领域:
- 细胞生物学 细胞生物学
- 生物物理学的生物物理.
- 基因组学就是基因组学.
背景情况:
- 细胞在受限环境中的迁移,如癌症转移,使细胞核受到机械应激.
- 这种压力会导致核膜 (NE) 破裂,导致染色质泄漏和基因组不稳定.
研究的目的:
- 调查核活性动力学在受限细胞迁移期间对NE破裂的反应中的作用.
- 确定分子机制,包括特定的蛋白质和信号通路,参与调节核破裂后的核机械特性.
主要方法:
- 使用活细胞成像研究了在NE破裂时核F-actin形成的动态.
- 通过使用遗传沉默和干扰,研究了formins (DIAPH1,DIAPH3) 和Ataxia Telangiectasia以及Rad3相关蛋白 (ATR) 的作用.
- 评估核稳定性和染色质泄漏.
- 使用原子力显微镜测量核刚度.
主要成果:
- 在受限迁移期间的NE破裂会诱导动态的核F-actin组合,依赖于DIAPH1和DIAPH3.
- 在NE破裂时,DIAPH3暂时迁移到核中.
- 与DIAPH1/3或核活性聚合物的干扰损害了核稳定性并增加了染色质泄漏.
- ATR信号促进了DIAPH3酸化,增强了核活性聚合和核性.
- ATR静音降低了核F-actin组合,并加剧了染色质泄漏.
结论:
- 一个ATR-formin模块通过诱导核内激素脚手架来调节核机械特性.
- 这条通路对于保持核完整性和防止细胞迁移期间的染色质泄漏至关重要.
- 研究结果提供了对保护基因组不稳定的机制的见解,例如癌症转移等过程中的基因组不稳定.
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