1.华南理工大学生物科学与工程学院,广东 广州 510006
2.华南理工大学医学院,广东 广州 510006
3.广东省临床药理学重点实验室//广东省人民医院//广东省医学科学院,广东 广州 510080
4.南方医科大学第二临床医学院,广东 广州 510280
杨莹,在读硕士研究生,研究方向:心肌纤维化分子调控机制,E-mail,904528037@qq.com
收稿:2020-10-06,
纸质出版:2021-01-20
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杨莹,郭晶,温艺红等.PTBP1介导长链非编码RNA RP11-879F14.2发挥抑制心肌纤维化的作用[J].中山大学学报(医学科学版),2021,42(01):33-41.
YANG Ying,GUO Jing,WEN Yi-hong,et al.PTBP1 Mediates the Effect of lncRNA RP11-879F14.2 on Suppression of Fibrosis-related Genes in Cardiac Fibroblasts[J].Journal of Sun Yat-sen University(Medical Sciences),2021,42(01):33-41.
杨莹,郭晶,温艺红等.PTBP1介导长链非编码RNA RP11-879F14.2发挥抑制心肌纤维化的作用[J].中山大学学报(医学科学版),2021,42(01):33-41. DOI:
YANG Ying,GUO Jing,WEN Yi-hong,et al.PTBP1 Mediates the Effect of lncRNA RP11-879F14.2 on Suppression of Fibrosis-related Genes in Cardiac Fibroblasts[J].Journal of Sun Yat-sen University(Medical Sciences),2021,42(01):33-41. DOI:
目的
2
研究长链非编码RNA(lncRNA)RP11-879F14.2调控心肌成纤维细胞纤维化表型的作用及机制。
方法
2
对心衰患者及健康对照者心肌组织进行Masson染色检测心肌胶原水平。lncRNA表达谱芯片检测心衰患者及健康对照者心肌中lncRNAs的表达变化,实时定量荧光PCR(RT-qPCR)验证RP11-879F14.2在心衰患者心肌中的表达。利用重组RP11-879F14.2腺病毒(rAd-RP11-879F14.2)感染人心房肌成纤维细胞(HAFs),检测纤维化相关基因
Col1a1
,
Col3a1
和
Acta2
表达。RT-qPCR检测HAFs的核/质组分中RP11-879F14.2的水平。基于生物信息学预测和双荧光素酶报告基因实验鉴定RP11-879F14.2与多聚嘧啶区结合蛋白(PTBP1)的结合作用。检测敲低HAFs中PTBP1表达对RP11-879F14.2调控心肌纤维化相关基因表达的影响。
结果
2
Masson染色结果显示,心衰病人心肌组织发生明显纤维化。RT-qPCR结果证实RP11-879F14.2在心衰患者心肌组织中表达增加(
P
<
0.01)。过表达RP11-879F14.2可在RNA及蛋白水平显著抑制心肌纤维化相关基因表达。核质分离及RT-qPCR检测结果证实RP11-879F14.2 主要分布于细胞核中。RP11-879F14.2可与PTBP1结合,并促进HAFs中PTBP1表达,而敲低PTBP1可逆转RP11-879F14.2抑制HAFs中纤维化相关基因表达的作用。
结论
2
PTBP1可介导RP11-879F14.2发挥抑制心肌纤维化的作用。
Objective
2
To investigate the effect of lncRNA RP11-879F14.2 on fibrotic phenotype of cardiac fibroblasts (CFs) and the mechanism involved.
Methods
2
Masson′s trichrome staining was performed to detect the level of myocardial fibrosis in the myocardium of patients with heart failure (HF) and the healthy controls. LncRNAs micro-array was used to detect the expression of lncRNAs in human myocardium samples. Real-time quantitative PCR (RT-qPCR) was performed to verify RP11-879F14.2 expression in the myocardium of HF patients and the healthy controls. The recombinant RP11-879F14.2 adenovirus (rAd-RP11-879F14.2) was used to infect human atrial myofibroblasts (HAFs). Expression of
Col1a1
,
Col3a1
and
Acta2
was detected by RT-qPCR and Western blot assay, respectively. Distribution of RP11-879F14.2 in the nucleus and cytoplasma of HAFs was determined by RT-qPCR assay. According to the results of bio-informatic prediction, dual-luciferase reporter assay was performed to confirm the interaction between RP11-879F14.2 and polypyrimidine tract binding protein 1 (PTBP1). Effect of PTBP1 knock-down on fibrosis-related genes expression modulated by RP11-879F14.2 in HAFs was determined.
Results
2
Masson′s trichrome staining showed that the myocardial fibrosis was significantly increased in the myocardium of HF patients. Consistent with lncRNA microarray results, RP11-879F14.2 was found obviously up-regulated in the myocardium of HF patients. Over-expression of RP11-879F14.2 inhibited mRNA and protein expression of myocardial fibrosis-related genes in HAFs. Results of nucleocytoplasmic separation and RT-qPCR assay showed that RP11-879F14.2 mainly distributed in the nucleus of HAFs. Dual-luciferase reporter assay revealed the interaction between RP11-879F14.2 and PTBP1. Over-expression of PTBP1 enhanced PTBP1 expression in HAFs, but knock-down of PTBP1 could reverse the anti-fibrotic effect of RP11-879F14.2 in HAFs.
Conclusion
2
PTBP1 mediates the anti-fibrotic effect of RP11-879F14.2 in HAFs.
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