细胞外矩阵粘弹性调节乳腺分支形态发生 细胞外矩阵粘弹性调节乳腺分支形态发生
Daniella I Walter1, Juliette W Moore2, Abhishek Sharma1
1Department of Mechanical Engineering, University of California, Santa Barbara, CA, 93117, USA.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|November 11, 2025
概括
矩阵应激放松率影响乳腺发育. 缓慢放松的矩阵通过启用细胞矩阵相互作用来促进分支,而快速放松的矩阵则抑制它.
科学领域:
- 生物医学工程 生物医学工程
- 发展生物学 发展生物学
- 细胞力学 细胞力学
背景情况:
- 细胞外矩阵 (ECM) 的机械特性对于组织形态发生至关重要.
- 现有的ex vivo模型在控制和模仿ECM机制方面存在局限性.
- 矩阵应力放松率在乳腺分支形态发生过程中的作用在很大程度上仍未被探索.
研究的目的:
- 调查矩阵应激放松率如何影响乳腺分支形态发生.
- 阐明底层的细胞和机械机制.
- 为研究组织发育建立一个更具生理相关性的模型.
主要方法:
- 使用3D酸盐 - 原基质矩阵,具有可调节的应力放松特性.
- 在这些矩阵中培养了人类乳腺上皮细胞球体.
- 分析了分支模式,ECM纤维对齐,细胞收缩和焦点粘附信号.
- 使用药理抑制剂 (Rac1,非肌肉肌肉蛋白II) 和透压来调节细胞行为.
主要成果:
- 缓慢的减压矩阵促进了乳腺分支形态发生.
- 在缓慢放松的矩阵中分支与原纤维对齐,间歇性ECM拉动和焦点粘附信号相关.
- 快速减压矩阵导致对ECM产生同otropic推力.
- 抑制Rac1或非肌肉肌肉蛋白II消除了分支,无论矩阵放松率如何.
- 通过透压来限制细胞扩张,甚至在缓慢放松的矩阵中也阻碍了分支.
结论:
- 矩阵应激放松率是乳腺分支形态发生的关键调节者.
- 细胞收缩性和细胞骨动力学 (Rac1,myosin II) 对于分支至关重要.
- 矩阵缓解压力的能力影响细胞施加和接收的力量类型,指导形态发生.
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