1.广东省心血管病研究所//广东省人民医院//广东省医学科学院,广东 广州 510080
2.华南理工大学医学院,广东 广州 510006
3.南方医科大学第二临床医学院,广东 广州 510280
陈丽文,硕士生,研究方向:心肌肥厚分子调控机制,E-mail: 15802031643@163.com
收稿:2021-09-24,
纸质出版:2022-03-20
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陈丽文,郭晶,陈泽润等.MicroRNA-99b-5p通过抑制成纤维细胞生长因子21表达促进心肌细胞肥大[J].中山大学学报(医学科学版),2022,43(02):192-202.
CHEN Li-wen,GUO Jing,CHEN Ze-run,et al.MicroRNA-99b-5p Aggravates Cardiomyocyte Hypertrophy by Down-regulating Fgf21[J].Journal of Sun Yat-sen University(Medical Sciences),2022,43(02):192-202.
陈丽文,郭晶,陈泽润等.MicroRNA-99b-5p通过抑制成纤维细胞生长因子21表达促进心肌细胞肥大[J].中山大学学报(医学科学版),2022,43(02):192-202. DOI: 10.13471/j.cnki.j.sun.yat-sen.univ(med.sci).2022.0204.
CHEN Li-wen,GUO Jing,CHEN Ze-run,et al.MicroRNA-99b-5p Aggravates Cardiomyocyte Hypertrophy by Down-regulating Fgf21[J].Journal of Sun Yat-sen University(Medical Sciences),2022,43(02):192-202. DOI: 10.13471/j.cnki.j.sun.yat-sen.univ(med.sci).2022.0204.
目的
2
研究微小RNA microRNA-99b-5p(miR-99b-5p)对心肌细胞肥大表型的调节作用及机制。
方法
2
实时荧光定量PCR(RT-qPCR)检测人心肌组织(包括健康对照者、心力衰竭患者心肌组织)以及横向主动脉缩窄(TAC) 手术小鼠心肌中miR-99b-5p的表达水平。血管紧张素Ⅱ(AngⅡ)处理原代乳小鼠心肌细胞(NMVCs)后,利用鬼笔环肽染色呈现心肌细胞大小,RT-qPCR检测miR-99b-5p表达水平。利用RT-qPCR及蛋白质免疫印迹法检测转染miR-99b-5p mimic对NMVCs中肥大相关基因及成纤维细胞生长因子21(Fgf21)表达的影响。双萤光素酶报告实验验证miR-99b-5p与Fgf21基因3'端非翻译区(3’UTR)的结合作用。利用腺病毒介导在NMVCs中过表达Fgf21及超氧化物歧化酶2(Sod2),并利用小干扰RNA(siRNA)敲低NMVCs中Fgf21和Sod2表达,研究Fgf21/Sod2轴是否介导miR-99b-5p对心肌细胞肥大表型的调节作用。
结果
2
MiR-99b-5p在心衰患者心肌组织、TAC术后的小鼠心肌组织及在AngⅡ处理的心肌细胞中均表达上调(
P
<0.01)。MiR-99b-5p可促进NMVCs中与肥大相关基因的表达(
P
<0.01)。双萤光素酶报告基因实验证实miR-99b-5p与Fgf21基因的3’UTR存在结合作用,并且miR-99b-5p可抑制Fgf21及其下游基因Sod2表达(
P
<0.05)。在NMVCs中过表达Fgf21或Sod2均可有效逆转miR-99b-5p的促心肌细胞肥大作用(
P
<0.05)。
结论
2
MiR-99b-5p在肥厚心肌中表达增加,并通过Fgf21/Sod2轴发挥促进心肌细胞肥大的作用。
Objective
2
To explore the role of microRNA-99b-5p (miR-99b-5p) in cardiomyocyte hypertrophy and the related mechanism involved.
Methods
2
The expression of miR-99b-5p in myocardium was detected by real-time quantitative PCR(RT-qPCR)in the myocardium of patients with heart failure(HF)and healthy controls, as well as in the myocardium of mouse model of transverse aortic restriction (TAC)-induced cardiac hypertrophy. Phalloidin-iFluor 647 staining was used to show the size of neonatal mouse ventricular cardiomyocytes(NMVCs)after AngⅡ treatment. MiR-99b-5p expression was determined by RT-qPCR in AngⅡ-treated NMVCs. After transfection with miR-99b-5p mimic, the expression of cardiac hypertrophy-associated genes and Fgf21 in NMVCs was detected by RT-qPCR and Western blot assay, respectively. We identified the interaction between miR-99b-5p and the 3’UTR of Fgf21 mRNA by dual luciferase reporter assay. The recombinant Ffg21 adenovirus(rAd-Fgf21)and rAd-Sod2 were used to infect NMVCs, and the expression of β-MHC, ANP, FGF21 and SOD2 was detected by Western blot assay. We knocked down Fgf21 and Sod2 in NMVCs to investigate the role of FGF21/Sod2 axis in miR-99b-5p-regulated NMVC hypertrophy.
Results
2
MiR-99b-5p expression was elevated in the myocardium of HF patients and TAC-operated mice, and in AngⅡ-treated NMVCs (
P
<0.01, respectively). MiR-99b-5p promoted the expression of hypertrophy-related genes in NMVCs (
P
<0.01). Results of dual luciferase reporter gene assay revealed the interaction between miR-99b-5p and Fgf21 mRNA. MiR-99b-5p down-regulated the expression of Fgf21 and the down-stream gene of Sod2(
P
<0.01). Overexpression of FGF21 or SOD2 could inhibit NMVC hypertrophy and effectively reversed the pro-hypertrophy effect of miR-99b-5p on NMVCs (
P
<0.05, respectively).
Conclusion
2
MiR-99b-5p is up-regulated in the hypertrophic myocardium and enhances cardiomyocyte hypertrophy via suppressing Fgf21/Sod2 axis.
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