miR-214對(duì)心肌細(xì)胞凋亡的影響及其分子機(jī)制研究
[Abstract]:BACKGROUND: With the change of modern life style, the acceleration of life rhythm and the increasing severity of aging population, the increasing incidence and prevalence of heart diseases will become increasingly prominent. Cardiomyocyte apoptosis is not an independent heart disease, but a pathological process involved in the occurrence of a variety of heart diseases. It is closely related to ischemic cardiomyopathy, arrhythmia, congenital heart disease, cardiac overload, myocardial viral infection, myocardial remodeling and heart failure. MicroRNAs are a class of non-coding RNAs, single-stranded RNA molecules encoded by endogenous genes and about 18-24 nucleotides in length. Recent studies have shown that these small molecules play an extensive role in gene regulation. For cardiomyocyte apoptosis, how microRNAs communicate is clarified. It is necessary to regulate this complex process through some pathways, and it is worth further exploring. We hope to study the role of a certain microRNA in the regulation of cardiomyocyte apoptosis.
AIM: To investigate the expression of microRNAs-214 in cardiomyocytes after oxidative stress by real-time PCR. The biological function of microRNAs-214 in cardiomyocytes was demonstrated by flow cytometry and Western Blot. The downstream target of microRNAs-214 was predicted and tested by bioinformatics method. Methods: 1. Rat primary myocardial cells were stimulated by hydrogen peroxide at different concentrations and at different time of action, and the process of oxygen free radical oxidative stress was simulated in vivo. The real-time PCR was used to detect microarray-214. The change of expression;
2. Mi-214 was overexpressed in cardiomyocytes and then treated with hydrogen peroxide at appropriate concentration. Compared with the control group, apoptotic cells were detected by flow cytometry and Western blot respectively.
3. Using on-line prediction software to predict the target gene of microRNA214, and then using real-time PCR, Western Blot and other methods to verify whether the target gene mRNA and protein expression changes after overexpression of microRNA214, and using luciferase double reporting system to verify the target sequence of microRNA214;
4. Combining with the transgenic mice model of microarray-214, the downstream target genes of microarray-214 were identified by real-time PCR, Western blot and immunohistochemistry, and the specific molecular mechanism of microarray-214 regulating apoptosis was analyzed.
Results: 1. Different concentrations of hydrogen peroxide at the same time on myocardial cells for 6 hours, with the increase of concentration, the expression of miR-214 showed a gradual downward trend. At the same time, the expression of Mi-214 decreased gradually with the prolongation of oxidative stress.
2. Mi-214 mimic was transfected into cardiomyocytes to overexpress Mi-214 in vitro, and then induced apoptosis by 0 uM (NC) and 100 uM hydrogen peroxide respectively. Flow cytometry and Western blot showed that the cardiomyocytes overexpressed by Mi-214 had a lower apoptosis rate, and the apoptosis-related proteins, active-caspase 3 and cleaved PARP, were found to be associated with apoptosis. The expression was also lower than that in the control group.
3. Using on-line target gene prediction software, it is predicted that bim, bak1, bax, BNIP 3 and CASP7 may be target genes of microarray-214 in rat primary myocardial cells. Further real-time PCR and Western Blot assay were used to detect the down-regulation of mRNA and protein levels of microarray-214 after overexpression of bim, Bax and casp7. The report system analysis further indicated that they may be direct targets of microRNAs-214, and there are binding sites with microRNAs-214 in their 3'-UTR.
4. The expression of PTEN and puma in the mRNA and protein levels of transgenic mice was down-regulated compared with wild mice by real-time PCR, Western Blot and immunohistochemistry.
Conclusion: 1. The expression of microarray-214 in cardiomyocytes stimulated by hydrogen peroxide decreased gradually with the increase of time or concentration.
2. overexpression of miR-214mimic enhances the anti apoptotic ability of cardiomyocytes.
3. Mi-214 may be synergistic with multiple downstream targets in the specific mechanism of apoptosis.
【學(xué)位授予單位】:浙江大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2015
【分類號(hào)】:R542.2
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