miR-145通过ADAM17介导的ACE2脱落缓解了光滑肌肉细胞表型过渡
Juan Wen1, Baiyi Tang1, Lan Guo1
1Department of Cardiology, The Third Xiangya Hospital of Central South University, Changsha 410013, China.
在代谢性高血压中,microRNA-145 (miR-145) 有助于防止血管光滑肌细胞 (VSMC) 过渡. 它通过调节ADAM17介导的ACE2分泌和ACE2-Ang-(1-7) -Mas受体轴来起作用,有利于血管重塑.
科学领域:
- 分子生物学分子生物学
- 心血管研究研究心血管研究
- 高血压病理生理学 高血压病理生理学
背景情况:
- 微RNA-145 (miR-145) 涉及血管光滑肌细胞 (VSMC) 的分化和血管重塑.
- 在高血压诱导的VSMC表型转变中,miR-145的精确分子机制仍然不完全理解.
- 研究ADAM17介导的ACE2分泌和ACE2-Ang-(1-7) -Mas受体轴的作用对于理解高血压至关重要.
研究的目的:
- 为了确定miR-145是否在正常和合成条件下调节VSMC的表型转换.
- 探索ADAM17介导的ACE2脱落在这个过程中的潜在参与.
- 阐明ACE2-Ang-(1-7) -Mas受体轴在代谢性高血压中的作用.
主要方法:
- 在使用高糖/高脂肪饮食30周的Wistar大鼠中建立了代谢高血压动物模型.
- 培养VSMC并用angiotensin II (Ang II) 用或不用miR-145模仿剂或抑制剂对它们进行治疗.
- 使用ADAM17siRNA进行联合治疗实验,以评估其在miR-145抑制剂作用中的作用.
主要成果:
- 代谢性高血压大鼠表现出收缩标志物 (α-SMA,SM22α),miR-145,ACE2和Mas受体的表达减少,同时增加了OPN表达.
- 在体外,miR-145抑制降低了收缩标志物和ACE2-Ang-(1-7)-Mas轴组件,同时增加了合成标志物 (OPN,EREG,MMP2).
- miR-145模仿逆转了这些影响;ADAM17 siRNA部分减轻了miR-145抑制剂诱导的变化,支持其在ACE2分泌中的作用.
结论:
- 在代谢性高血压中,miR-145减轻了VSMC表型的从收缩到合成的转变.
- 这种保护作用通过调节ADAM17依赖的ACE2脱落和ACE2-Ang-(1-7) -Mas受体轴的保存来调节.
- 向miR-145可能为管理代谢性高血压中的血管结构改造提供治疗策略.
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