替代拼接因子PTBP1的机械控制调节了细胞外矩阵刚度诱导的增殖和细胞扩散
Pei-Li Tseng1, Weiwei Sun1, Ahmed Salem1,2
1School of Biosciences, University of Sheffield, Sheffield S10 2TN, UK.
iScience
|April 17, 2025
概括
细胞使用机械线索进行生物调节. 这项研究确定了像PTBP1这样的蛋白质,它们对机械信号做出反应,通过替代拼接影响细胞行为和分化.
科学领域:
- 细胞生物学 细胞生物学
- 生物化学 生物化学
- 机械生物学 机械生物学
背景情况:
- 细胞感知并响应机械刺激,这一过程对发育,衰老和疾病至关重要.
- 机械传导,即将机械线索转化为生物化学信号,对于细胞功能至关重要.
- 核蛋白定位是细胞对机械力反应的一个关键方面.
研究的目的:
- 系统地识别表现出机械敏感核局部化的蛋白质.
- 研究拼接因子 PTBP1 在机械传导中的作用.
- 阐明细胞外矩阵 (ECM) 刚性影响细胞行为的机制.
主要方法:
- 针对具有机械敏感核定位的蛋白质进行大规模的系统选.
- 针对不同细胞密度,大小和ECM刚性的PTBP1核丰度的定量分析.
- 研究PTBP1在调节Numb基因的替代拼接中的作用.
- 评估PTBP1和Numb替代拼接对细胞扩散,增殖和干细胞分化的功能影响.
主要成果:
- 识别了许多具有机械敏感核定位的蛋白质.
- 证明PTBP1的核丰度是由细胞密度,大小和ECM刚度等机械线索调节的.
- 证据表明,PTBP1调解了Numb基因的机械敏感替代拼接.
- 确认 PTBP1 和 Numb 替代拼接对于 ECM 刚性诱导的上皮细胞扩散,增殖和介质干细胞骨质基因分化至关重要.
结论:
- 替代拼接在细胞机械传导中起着重要作用.
- PTBP1作为一个关键的调解者,将机械线索与替代拼接联系起来.
- 矩阵刚度通过PTBP1-Numb拼接轴影响细胞反应,包括分化和增殖.
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