心脏纤维化
竞争性内源性RNA
肌成纤维细胞
纤维化
基因敲除
基因沉默
小发夹RNA
心功能曲线
内生
心力衰竭
癌症研究
生物
细胞生物学
医学
核糖核酸
长非编码RNA
细胞凋亡
内科学
内分泌学
基因
生物化学
作者
Haihai Liang,Zhenwei Pan,Xiaoguang Zhao,Li Liu,Jian Sun,Xiaomin Su,Chaoqian Xu,Yuhong Zhou,Dandan Zhao,Bernardy Xu,Xuelian Li,Baofeng Yang,Yanjie Lu,Hongli Shan
出处
期刊:Theranostics
[Ivyspring International Publisher]
日期:2018-01-01
卷期号:8 (4): 1180-1194
被引量:127
摘要
Rationale: Cardiac fibrosis is associated with various cardiovascular diseases and can eventually lead to heart failure.Dysregulation of long non-coding RNAs (lncRNAs) has recently been recognized as one of the key mechanisms involved in cardiac diseases.However, the potential roles and underlying mechanisms of lncRNAs in cardiac fibrosis have not been explicitly delineated.Methods and Results: Using a combination of in vitro and in vivo studies, we identified a lncRNA NONMMUT022555, which is designated as a pro-fibrotic lncRNA (PFL), and revealed that PFL is up-regulated in the hearts of mice in response to myocardial infarction (MI) as well as in the fibrotic cardiac fibroblasts (CFs).We found that knockdown of PFL by adenoviruses carrying shRNA attenuated cardiac interstitial fibrosis and improved ejection fraction (EF) and fractional shortening (FS) in MI mice.Further study showed that forced expression of PFL promoted proliferation, fibroblast-myofibroblast transition and fibrogenesis in mice CFs by regulating let-7d, whereas silencing PFL mitigated TGF-β1-induced myofibroblast generation and fibrogenesis.More importantly, PFL acted as a competitive endogenous RNA (ceRNA) of let-7d, as forced expression of PFL reduced the expression and activity of let-7d.Moreover, let-7d levels were decreased in the MI mice and in fibrotic CFs.Inhibition of let-7d resulted in fibrogenesis in CFs, whereas forced expression of let-7d abated fibrogenesis through targeting platelet-activating factor receptor (Ptafr).Furthermore, overexpression of let-7d by adenoviruses carrying let-7d precursor impeded cardiac fibrosis and improved cardiac function in MI mice. Conclusion:Taken together, our study elucidated the role and mechanism of PFL in cardiac fibrosis, indicating the potential role of PFL inhibition as a novel therapy for cardiac fibrosis.
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