单向剪切应力操作的NOTCH/CXCR4分子开关控制半月膜成熟和原分层
Charles R Dai1, Duc H Pham1,2, G Janani1
1The Nancy E. and Peter C. Meinig School of Biomedical Engineering, Cornell University, Ithaca, NY (C.R.D., D.H.P., G.J., B.L., J.T.B.).
Arteriosclerosis, thrombosis, and vascular biology
|December 4, 2025
概括
剪切应激激活内心细胞中的NOTCH1/CXCR4分子开关,通过抑制生长和促进组织重塑来调节胎儿心脏膜成熟. 这确定了一个血液动力学提示控制门发育.
科学领域:
- 心血管生物学 心血管生物学
- 发展生物学 发展生物学
- 分子心脏病学分子心脏病学
背景情况:
- 胎儿心脏门重塑的机制尚未完全理解.
- 血液动力学力量在发育过程中的膜发育信号中的作用尚不清楚.
- 假设剪切应激特异性内心信号引导门叶片重塑和成熟.
研究的目的:
- 调查局部血液动力学压力如何调节胎儿半月心脏门的成熟.
- 为了确定血动力学力量和膜生成信号程序之间的相互作用.
主要方法:
- 鉴定了内心NOTCH1和介质细胞CXCR4.4的室腔特异表达.
- 为体内分析生成有条件的Notch和Cxcr4鼠标删除.
- 使用ex vivo小内心细胞和管器官来获得和丧失功能的研究.
- 通过组织学,免疫组织化学和qRT-PCR进行了定量分析.
主要成果:
- 单向层状剪切应力通过内心NOTCH信号调节CXCR4,上调SDF1.1.
- 全球和介质细胞特异性Cxcr4删除导致过度增殖和加厚的输出管道.
- 切除Cxcr4抑制了BMP和WNT信号传递,促进了矩阵重塑和组织紧缩.
结论:
- 高强度的单向层状剪切应力激活了内心细胞中的NOTCH1/CXCR4分子开关.
- 这种开关抑制了膜介质细胞的生长,同时促进了凝结,分化和ECM重塑.
- 发现了一种新的血液动力学控制的分子开关,指导侧面特定 maturation.
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