Sp1机械传导调节了乳腺癌细胞在工程粘性弹性细胞外基质中侵入的过程
Abhishek Sharma1, Rowan F Steger2, Jen M Li3
1Department of Mechanical Engineering, University of California, Santa Barbara, Santa Barbara, CA, USA.
Biomaterials
|October 17, 2025
概括
瘤微环境的刚性和压力放松影响乳腺癌的进展. 机械反应性转录因子Sp1驱动恶性特征,与患者存活率降低相关,突出其在癌症信号传递中的作用.
科学领域:
- 生物医学工程 生物医学工程
- 癌症生物学 癌症生物学
- 机械生物学 机械生物学
背景情况:
- 乳腺癌的进展涉及细胞外基质 (ECM) 改造,包括硬度,粘性弹性和原密度的变化.
- 个别的ECM因素会影响癌细胞的行为,但它们在复杂的微环境中的综合作用尚未完全理解.
研究的目的:
- 剖析可调节的ECM刚性,应力放松和原密度对癌细胞表型的综合影响.
- 研究转录因子Sp1在乳腺癌进展中的机制反应调节者的作用.
主要方法:
- 工程化酸盐 - 原蛋白水凝具有独立调节的刚性,应力放松和原蛋白密度.
- 评估了癌细胞形态,球状入侵和单细胞迁移.
- 利用RNA-seq和CUT&Tag-seq来分析基因表达和Sp1结合.
- 与患者生存数据相关的Sp1-调控基因表达.
主要成果:
- 高硬度,快速放松应力和高原密度促进了球状体入侵和改变细胞形态.
- 单细胞迁移在具有高刚性,低原蛋白和缓慢压力放松的矩阵中最高.
- 在高刚性和快速减压矩阵中,Sp1目标基因表达和基因组结合得到了丰富.
- Sp1酸化 (T453) 增加了核定位在硬,快速减压环境中,由PI3K,ERK1/2和actomyosin收缩性调节.
- Sp1-调节基因的高表达与低克劳丁乳腺癌患者的生存率降低相关.
结论:
- 可调节的水凝平台表明,结合瘤模仿的ECM线索可以加强恶性特征.
- Sp1作为一个关键的机械反应转录因子,转导来自粘弹性微环境的信号.
- 响应特定ECM属性的Sp1驱动基因表达与乳腺癌患者预后不佳有关.
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