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细胞周期和转录终结因子TTF2之间的相互调节

Yuying Hu¹, Lele Xu^1,2, Bicong Feng¹

¹Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Laboratory of Molecular Oncology, Peking University Cancer Hospital & Institute, Beijing, 100142, China.

Science China. Life sciences

|May 23, 2025

概括

转录终结因子TF2将细胞循环调节与转录联系在一起. 在细胞循环期间,TTF2会振荡,影响线粒分裂和增殖,其失调与固体瘤有关.

科学领域:

分子生物学分子生物学
细胞生物学细胞生物学
癌症生物学癌症生物学

背景情况:

转录活动通常在线粒分裂过程中被静止,并在线粒分裂退出时被重新激活.
在细胞周期期间控制这种转录调节的精确机制在很大程度上是未知的.

研究的目的:

阐明转录终结因子TTF2在细胞周期调节中的作用.
调查TTF2之间的相互作用,亚纳酶促进复合物/环体 (APC/C) 和线粒体检查点复合物 (MCC).

主要方法:

在细胞周期进展过程中对TTF2的蛋白质水平分析.
对TTF2.2进行了淘汰和过度表达的研究.
乌比基化试验用于研究通过APC/C^CDH1降解TTF2.
对TTF2结合CDC20和MCC形成的分析.

主要成果:

TTF2蛋白水平波动,在S和G2/M阶段增加,在较晚的线粒分裂和G1.0阶段减少.
TTF2的淘汰会导致G2/M的停止;TTF2的过度表达会加速M/G1的转变并促进扩散.
TTF2由APC/C^CDH1进行无处不在化,并由蛋白质酶体降解.
在正常的线粒分裂过程中,TTF2通过结合CDC20来抑制MCC的形成.
在G2/M捕获期间,通过APC/C^{CDH1的TF2降解释放CDC20,促进MCC组装.}
在固体瘤中,TTF2过度表达,与患者生存率差相关.

结论:

TTF2 作为转录终止和细胞周期调节之间的关键环节.
通过调节APC/C和MCC活动,TTF2在线粒分裂中起着双重作用.
TTF2失调有助于瘤发生和固体瘤的不良预后.

关键词:

亚纳相促进复合体/循环细胞体细胞循环停止细胞循环停止线粒细胞检查点综合体转录终止因子2 转录终止因子2

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