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诺奇3/Hes5诱导血管功能障碍在低氧诱导的肺高血压通过ER压力和Redox敏感途径
Hannah E Morris1, Karla B Neves1, Margaret Nilsen2
1Institute of Cardiovascular and Medical Sciences, University of Glasgow, United Kingdom (H.E.M., K.B.N., A.C.M., R.M.T.).
Hypertension (Dallas, Tex. : 1979)
|May 31, 2023
概括
功能增益的Notch3 (神经源基位突破同源蛋白3) 突变通过增加氧化和ER压力,以及ROCK信号,加剧肺高血压 (PH). 这项研究揭示了PH病变发生过程中一种新的Notch3/Hes5-redox途径.
科学领域:
- 心血管生物学 心血管生物学
- 分子医学是分子医学.
- 肺高血压研究 肺高血压研究
背景情况:
- 诺奇3 (neurogenic locus notch homolog protein 3) 与诸如肺高血压 (PH) 这样的血管疾病有关.
- 驱动Notch3在PH中的作用的精确分子机制尚不清楚.
- 这项研究调查了Notch3激活的增加是否会引发氧化和内质网膜 (ER) 压力,影响肺血管功能.
研究的目的:
- 探索Notch3激活有助于肺血管功能障碍和PH的分子机制.
- 调查氧化应激,ER应激和Rho相关激酶 (ROCK) 信号在Notch3-介导PH中的作用.
- 检查在PH的发展中Notch3信号与氧化还原平衡之间的相互作用.
主要方法:
- 使用了TgNotch3R169C小鼠,具有获得功能的Notch3突变,暴露于慢性缺氧,以模拟PH.
- 评估了血液动力学参数,肺血管反应能力和分子标志物,包括ER压力,ROCK活性和反应性氧物种 (ROS) 生成.
- 检查了PH患者的肺动脉光滑肌细胞 (PASMC) 和小鼠肺组织.
主要成果:
- TgNotch3R169C小鼠表现出加剧的PH,增加的Notch3激活,以及升高的Hes5表达.
- 诺奇3功能增强导致肺血管收缩增加,放松功能受损,ROCK活动升高,ER压力和ROS产生.
- 观察到氧化物 (NO) 生产减少和可溶性瓜尼利基环酶 (sGC) /cGMP信号减弱,在用法苏迪尔,4-酸或N-乙半氨酸治疗时观察到改善.
- 在PH患者的PASMC中反映了小鼠模型中发现的Notch3/Hes5信号,ER压力和氧化还原变化.
结论:
- 功能增益的Notch3突变通过促进血管功能障碍来增强缺氧性肺高血压.
- 这个过程涉及氧化应激,ER应激和ROCK信号通路.
- 这项研究突出了一个新的Notch3/Hes5-redox信号轴,以及在PH病变发生过程中ER和氧化应激之间的关键相互作用.
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