Circulation:长链非编码RNA H19诱导腹主动脉瘤的发生发展

2018-10-13 MedSci MedSci原创

长链非编码RNAs是多种生物过程和疾病中重要的分子调控因子。Daniel Y.Li等人尝试鉴别在腹主动脉瘤进展过程中发挥重要作用的长链非编码RNA,并在功能上加以区分。研究人员在两种小鼠腹主动脉瘤模型(输注血管紧张素II[ANGII]的脂蛋白E缺陷[ApoE-/-]小鼠[8只]和用猪胰腺弹性酶灌注的C57BL/6野生型小鼠[12只])上分析RNA转录本的表达。长链非编码RNA H19是在两种小鼠动

长链非编码RNAs是多种生物过程和疾病中重要的分子调控因子。Daniel Y.Li等人尝试鉴别在腹主动脉瘤进展过程中发挥重要作用的长链非编码RNA,并在功能上加以区分。

研究人员在两种小鼠腹主动脉瘤模型(输注血管紧张素II[ANGII]的脂蛋白E缺陷[ApoE-/-]小鼠[8只]和用猪胰腺弹性酶灌注的C57BL/6野生型小鼠[12只])上分析RNA转录本的表达。长链非编码RNA H19是在两种小鼠动脉瘤模型(与假手术对照小鼠相比)均显著上调的转录本之一。

通过位点特异性反义寡核苷酸(LNA-GapmeRs)在体内实验性敲低H19,可明显限制两种模型动脉瘤的生长。H19上调与进展性动脉瘤平滑肌细胞(SMC)的含量及SMC凋亡相关。重要地是,可在人类腹主动脉瘤组织样本和新型预临床LDLR-/-(低密度脂蛋白受体)Yucatan迷你猪动脉瘤模型中观察到相似的图谱。体外敲低H19可显著降低培养的人类动脉SMCs的凋亡率,而过表达H19则具有相反的效应。

值得注意的是,在SMCs中,H19依赖性的细胞凋亡机制似乎与miR-675(嵌于H19基因的第一个外显子中)无关。研究人员进一步发现低氧诱导因子1α是主要的下游效应器。SMC凋亡增加与H19和低氧诱导分子1α在胞质内的相互作用以及随后的p53的稳定性相关。此外,H19可通过招募转录因子特异性蛋白1聚集到低氧诱导分子1α的启动子区域,从而促进其转录。

长链非编码RNA H19是腹主动脉瘤发生发展过程中SMC存活的新型调控因子。抑制H19的表达或许可作为腹主动脉疾病的新型分子治疗靶点。


原始出处:

Daniel Y.Li,et al.H19 Induces Abdominal Aortic Aneurysm Development and Progression.Circulation. Apr 18,2018;138:1551–1568

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    2018-10-30 tidiq
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    2018-10-15 白袍甘道夫

    学习了

    0

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    2018-11-06 d830384

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