由年龄和代谢压力驱动的ECM修改直接促进血管光滑肌细胞骨质过程
Meredith Whitehead1, Maria Faleeva1, Rafael Oexner1
1British Heart Foundation Centre of Research Excellence, School of Cardiovascular and Metabolic Medicine & Sciences (M.W., M.F., R.O., L.S., M.M., C.M.S.), King's College London, United Kingdom.
Arteriosclerosis, thrombosis, and vascular biology
|January 16, 2025
概括
由于衰老和疾病导致的细胞外基质 (ECM) 变化直接触发了血管光滑肌细胞 (VSMC) 的骨质分化. 本研究引入了一种新的模型来研究ECM.
科学领域:
- 生物医学工程 生物医学工程
- 细胞生物学 细胞生物学
- 血管生物学 血管生物学
背景情况:
- 细胞外基质 (ECM) 对血管光滑肌细胞 (VSMC) 功能至关重要.
- 衰老和代谢疾病改变了ECM的组成和特性,影响了VSMC的表型.
- 这些ECM变化对VSMC表型的具体影响尚不清楚.
研究的目的:
- 开发和使用一种新的体外模型系统来研究与衰老和代谢疾病相关的ECM修改如何影响VSMC表型.
- 分析改变的ECM诱导VSMC骨质分化的机制.
主要方法:
- 使用原始人类VSMC合成内源ECM,在培养过程中或脱细胞化后进行修改.
- 使用超分辨率显微镜,原子力显微镜和蛋白质学来描述ECM的完整性,刚性和组成.
- 在经过修改的ECM上评估了VSMC的生存能力和骨质生成差异化.
主要成果:
- 矿物质压力ECM显示酸沉积和改变的原,诱导VSMC骨质基因表达通过Runx2 (Runt相关转录因子2) 和增加反应性氧物种.
- 衰老的ECM还促进了Runx2-介导的骨质基因表达,并加速了化.
- 糖化ECM诱导的性酸酶 (ALP) 活性取决于RAGE (高级糖化终产品的受体) 信号传递,通过抑制ALP或RAGE来减弱.
结论:
- 在衰老和代谢疾病中的ECM修改直接通过不同的途径诱导VSMC骨质分化.
- ECM微环境是VSMC表型调节的关键因素,加速了血管病理.
- 这项研究为研究血管化机制提供了一个新的模型.
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