在右心室衰竭中,微RNA-34a-依赖血管生成的衰减
Sushma Reddy1, Dong-Qing Hu1, Mingming Zhao1
1Department of Pediatrics (Cardiology) and Cardiovascular Institute Stanford University Stanford CA.
Journal of the American Heart Association
|January 31, 2024
概括
在右心室衰竭中,MicroRNA-34a通过抑制缺氧诱导因子-1α-VEGF通路,导致毛细血管稀缺. 对miR-34a的治疗向可能会改善风险右心室患者的治疗结果.
科学领域:
- 心血管生物学 心血管生物学
- 分子心脏病学分子心脏病学
- 血管生物学 血管生物学
背景情况:
- 右心室 (RV) 功能障碍是复杂先天性心脏病的风险.
- 毛细血管稀缺是压力加载RV的早期事件.
- 微RNA (miR) -34a在RV高和衰竭 (RVF) 中受到上调.
研究的目的:
- 测试miR-34a是否阻断低氧诱导因子-1α-血管内皮生长因子 (VEGF) 轴.
- 要确定这是否会导致血管生成减弱和对RVF的敏感性增加.
- 研究miR-34a作为RVF的治疗点.
主要方法:
- 在小鼠中,肺动脉带状形成,诱导RV缩和RVF.
- 对miR-34a,低氧诱导因子-1α和VEGF表达的分析.
- 在内皮细胞中,miR-34a的过度表达.
- 用锁定核酸抗miR-34a.治疗RVF小鼠.
- 对与先天性心脏病相关的RVF儿童的RV毛细体和miR-34a的分析.
主要成果:
- 在RVF小鼠中,毛细血管稀疏,缺氧诱导因子-1α增加,VEGF表达减少.
- 在纤维细胞,心肌细胞和内皮细胞中,miR-34a被上调.
- miR-34a在内皮细胞中的过度表达增加了衰老,抑制了Sirtuin 1,并减少了管道形成.
- 锁定核酸抗miR-34a改善了小鼠的VR功能,生存,毛细血管和VEGF表达.
- 患有RVF的儿童的RV毛细体减少,miR-34a增加.
结论:
- miR-34a通过抑制缺氧诱导因子-1α-VEGF轴来调解RV缩/RVF中的毛细血管稀疏.
- 这通过来自纤维细胞,心肌细胞和内皮细胞的miR-34a发生.
- 抗miR-34a治疗药物显示出治疗有风险的RV患者的潜力.
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