Aortic dissection is a rare but dangerous disease, the overall mortality and surgery-related mortality are very high. In China, aortic dissection occurs mostly in hypertension population, and with the expansion of the hypertension population, the incidence of aortic dissection has increased year by year. Correct understanding of aortic dissection, you first need to clarify its pathophysiological characteristics, different researches explain the molecular mechanisms of aortic dissection. miRNAs are a class of small non-coding RNA containing 18-25 nucleotides, the current study shows that miRNAs exist widespread in body tissues and organs and participate the regulation of cell proliferation, differentiation, apoptosis. Serum miRNAs is a form of miRNA, which is widely used in clinical and basic research as serum marker. Our previous studies have found a possible link between serum miRNA and acute aortic dissectio, but further research is needed to reveal the serum miRNA profiling and biological function in patients with acute aortic dissection for translating to clinical application.
主动脉夹层是一种少见但病情凶险的疾病,一旦发病总体死亡率和手术相关死亡率都非常高。在我国,主动脉夹层好发于高血压人群,并且随着高血压人群的扩大,主动脉夹层的发生率也逐年升高。正确认识主动脉夹层,首先需要明确其病理生理特点,围绕此方面的机制研究从不同角度阐释了主动脉夹层的分子机制。miRNAs是一类长度为18-25个核苷酸的非编码小RNA的总称,目前研究显示miRNAs广泛存在与机体各组织器官中,参与细胞增殖、分化、凋亡和相关生物学功能的调控。血清miRNA作为miRNA的一种存在形式,被作为血清标志物广泛用于临床及基础研究。我们的前期研究发现了血清miRNA和急性主动脉夹层之间可能存在的联系,但需要更进一步的研究来揭示急性主动脉夹层患者血清miRNA表达谱及有变化意义的miRNA的生物学功能,以及转化为临床应用所需。
急性A型主动脉夹层(AAAD)由于其在第一个48小时内的高死亡率,迫切需要早期诊断。微小RNA(miRNA)是心血管疾病中有应用前景的生物标志物,但是关于miRNA如何参与AAAD的了解仍然很少。我们从104位AAAD患者和103位年龄相匹配的非AAAD患者中采集血清。使用TaqMan芯片进行初步筛选,然后进行QRT-PCR验证。我们发现AAAD血清中miR-25,miR29a和miR-155显着升高,而miR-26b显着降低。最重要的是,对于高血压患者, 4组miRNA能够预测识别出更有可能发展为AAAD的患者。4组miRNA可以用作AAAD非侵入性生物标记物,尤其是对于高血压患者提前预测。PGC-1α是关键细胞能量稳态的调节剂,在我们的研究中,PGC-1α在在病变主动脉血管中显著降低。探索miRNAs是否可能受血管平滑肌中PGC-1α的调控,对主动脉中层平滑肌细胞进行芯片分析。芯片和Pearson的结果表明PGC-1α和miR-378a在体内和体外呈正相关。作为转录共激活因子,PGC-1α是通过与血管平滑肌细胞中的转录因子NRF1结合来调节miR-378a。miR-378a的体外上调显着抑制了血管平滑肌细胞的异常增殖,迁移和炎症。另外,miR-378a的体外上调可以抑制血管平滑肌细胞由紧缩型向分泌型的表型转化。综上, miRNA可以作为AAAD患者的诊断和风险预测,具有临床转化意义,也为miRNA在主动脉疾病的治疗提供了潜的治疗靶点。
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数据更新时间:2023-05-31
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