克鲁佩尔样因子2的流量依赖调节由微RNA-92a介导
Wei Wu1, Han Xiao, Andrés Laguna-Fernandez
1Division of Biomedical Sciences, University of California-Riverside, 92521, USA.
Circulation
|July 20, 2011
概括
动脉保护流降低了miR-92a水平,增加了克鲁佩尔样因子2 (KLF2) 的表达,以维持内皮平衡. 这项研究揭示了microRNA-92a作为KLF2响应血液流动的关键调节者.
科学领域:
- 内皮细胞生物学 内皮细胞生物学
- 分子生物学分子生物学
- 心血管研究的心血管研究.
背景情况:
- 克鲁佩尔样因子2 (KLF2) 对于内皮功能至关重要,并通过动脉膜保护流进行上调.
- 微RNA (miRNA) 是小型非编码RNA,在转录后调节基因表达.
- 这项研究研究了miRNAs,特别是miR-92a在流量调节的KLF2.2中的作用.
研究的目的:
- 阐明miR-92a在通过动脉动脉保护性血流调节克鲁佩尔样因子2 (KLF2) 的作用.
- 了解miR-92a影响KLF2表达和下游目标的分子机制.
主要方法:
- 在人类静脉内皮细胞 (HUVECs) 中利用Dicer敲除来评估KLF2的miRNA调节.
- 在分析中进行预测miR-92a与KLF2 3' UTR结合.
- 采用miR-92a过度表达和抑制剂研究来评估对KLF2及其标 (eNOS,血栓模块素) 的影响.
- 在HUVEC中研究了miR-92a前体和KLF2表达在层状和振荡式剪切流条件下.
- 使用抗Ago1/2免疫沉和qPCR来评估不同流量条件下的miR-92a/KLF2mRNA的功能向.
- 将miR-92a前体给小鼠动脉,以评估体内对血管扩张反应的影响.
主要成果:
- 迪塞尔敲击增加了KLF2mRNA,表明了miRNA介导的抑制.
- miR-92a直接针对KLF2mRNA,降低KLF2及其下游目标 (eNOS,血栓模块素) 的表达.
- 动脉保护层流下调 miR-92a 前体,导致KLF2表达的增加.
- 在动脉保护性脉动性切割流下,miR-92a水平较低,而在HUVEC中,与动脉振式切割流相比,miR-92a水平较低.
- 脉冲式切割流减少了miR-92a/KLF2mRNA的功能向.
- 在体内,miR-92a前体的使用损害了小鼠动脉的血管扩张反应.
结论:
- 动脉保护性流动模式可以降低miR-92a水平.
- 降低的miR-92a增强了KLF2的表达,这对于维持内皮平衡至关重要.
- miR-92a作为一个关键的分子开关在流介导调节内皮功能.
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