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动因分支调节细胞扩散和对塔林施加力量,但不能激活YAP
Claudia Villalobos1, Amir Sadeghifar1, Jose Maggiorani1
1Department of Chemical and Biomedical Engineering, FAMU-FSU College of Engineering, Florida State University, Tallahassee, FL, 32310.
bioRxiv : the preprint server for biology
|July 14, 2025
概括
细胞机械传感涉及YAP通路,但actin分支的作用尚不清楚. 这项研究发现,抑制动因分支会降低对Talin的作用力,但不会显著改变YAP激活,这表明间接调节.
科学领域:
- 细胞生物学 细胞生物学
- 机械生物学 机械生物学
- 生物物理学的生物物理.
背景情况:
- 细胞通过物理相互作用感知环境机制,影响转录因子YAP局部化.
- 高基板刚度和细胞扩散促进YAP核转位和激活.
- Arp2/3复合体对于分支的活性蛋白网络至关重要,对于细胞扩散,迁移和突起至关重要.
研究的目的:
- 调查在发力和YAP激活中actin分支的特定作用.
- 为了确定抑制雅丁分支是否会影响YAP核转位和细胞力传输.
- 在YAP激活中区分分子层面和细胞层面的力调节.
主要方法:
- 在3T3细胞中测量了细胞扩散面积和YAP核转位.
- 使用Förster共振能量转移 (FRET) 张力传感器来量化对塔林蛋白的力.
- 采用引力显微镜 (TFM) 来评估细胞外力.
- 使用特定的化学抑制剂抑制了actin分支.
主要成果:
- 观察到YAP激活,即使减少了actin分支和细胞扩散.
- 抑制动氨酸分支降低了塔林的力,但对平均引应力影响最小.
- 这些发现突出了调节YAP的分子层面力量和细胞层面力量之间的差异.
- 细胞扩散似乎间接影响YAP核转位,而不是直接影响.
结论:
- 动蛋白分支和相关的细胞扩散不是YAP激活的直接驱动因素.
- 焦点粘附分子力不是YAP激活的主要调节者.
- 细胞对YAP激活的力量调节是复杂的,可能涉及间接机制,与在焦点粘附处直接感应力不同.
关键词:
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