SMAD4保持了流体剪切应力设定点,以防止动脉静脉形形
Kuheli Banerjee1, Yanzhu Lin1, Johannes Gahn1
1Experimental Pharmacology Mannheim (EPM) and.
The Journal of clinical investigation
|July 25, 2023
概括
内皮细胞中SMAD4的丧失通过增加流动灵敏度来破坏血管稳定,导致由于过度细胞增殖和动脉身份的丧失导致动脉静脉形 (AVM).
科学领域:
- 血管生物学 血管生物学
- 血管发育的分子机制.
- 细胞信号在心血管健康中的作用
背景情况:
- 血管网络的形成依赖于流体剪切应力 (FSS) 和可溶性因素,如骨形态蛋白质 (BMP9/BMP10).
- 在BMP信号通路 (ALK1, ENG, SMAD4) 中的突变会导致遗传性出血端膜病变 (HHT),导致脆弱的动脉静脉形 (AVM).
- 在内皮细胞 (ECs) 中FSS和BMP信号传递之间的相互作用及其在血管形中的作用仍然不清楚.
研究的目的:
- 研究FSS和SMAD信号之间的协同机制,以保持血管稳定.
- 了解这种协同作用中的中断如何有助于AVM的发展.
- 阐明将SMAD4损失与AVM病原发生联系起来的分子途径.
主要方法:
- 研究了Smad4删除对内皮细胞对FSS敏感性的影响.
- 在Smad4缺陷模型中分析了AVM的形态和分子特征.
- 研究了KLF4-TIE2-PI3K/Akt信号传导和细胞循环调节器 (CDKN2A,CDKN2B) 在流介导EC反应中的作用.
主要成果:
- Smad4的损失降低了FSS的设定点,增加了EC对流量的敏感性.
- 缺少smad4的AVM显示过度的流量介导形态变化.
- 通过抑制CDK抑制剂CDKN2A和CDKN2B,SMAD4的损失会消毒KLF4-TIE2-PI3K/Akt信号传递,促进EC的扩散和动脉身份的损失.
结论:
- 由Smad4删除引起的AVM是由慢性高流量重塑驱动的.
- 过度的EC增殖和动脉身份的丧失是Smad4缺乏AVM的关键触发事件.
- 了解FSS-SMAD4-KLF4轴对于AVM病原和潜在的治疗策略至关重要.
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