动蛋白调节的核形状控制癌症相关纤维细胞的适应性重编程
bioRxiv : the preprint server for biology
|August 8, 2025
概括
BRAF抑制剂通过诱导核变形来重编程与癌症相关的纤维细胞 (CAF),促进核β-catenin的积累. 这种机械过程由ROCK信号介导,改变了瘤微环境中的CAF转录活性.
科学领域:
- 在瘤学瘤学.
- 细胞生物学 细胞生物学
- 生物化学 生物化学
背景情况:
- 癌症相关纤维细胞 (CAF) 是瘤微环境 (TME) 的关键组成部分,可以通过外部刺激进行重新编程.
- 治疗剂和细胞外矩阵 (ECM) 刚性影响TME内的CAF行为.
研究的目的:
- 研究BRAF抑制剂 (BRAFis) 诱导CAFs重编程的机制.
- 阐明核β-catenin积累和机械力量在CAF适应中的作用.
主要方法:
- 使用BRAF抑制剂 (BRAFis) 和硬基板来治疗CAFs.
- 调查了行为蛋白聚合,核变形和β-catenin核进口的作用.
- 研究了RAS,RAF,ERK,GSK-3β和Rho激酶 (ROCK) 信号通路的参与.
- 采用了RAS和RAF异型的基因切除和ROCK活动的药理阻断.
主要成果:
- 在CAF中,BRAF通过actin介导的核变形诱导β-catenin的核积累.
- 刚性基板还促进细胞骨重组和核β-catenin进入CAF.
- 由BRAFi诱导的β-catenin的核导入由ROCK-细胞骨轴介导,涉及RAS-RAF-ERK信号传输.
- RAS/RAF异型的ROCK抑制或消去抑制了BRAFi诱导的核变形和β-catenin进入.
结论:
- 通过ROCK调节的actin聚合是CAF在响应外部信号时重编程的关键途径.
- BRAF是通过机械驱动核β-catenin运输通过非正规机制重新编程CAF.
- 准ROCK-细胞骨轴可能提供一种策略,以调节癌症治疗中的CAF行为.
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