Mucosal bromodomain-containing protein 4 mediates aeroallergen-induced inflammation and remodeling

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miR－21调控TGF－β1诱导的大鼠BMSCs向肌成纤维细胞分化的机制研究

目的：在细胞水平探索miR－21在调控TGF－β1诱导的大鼠骨髓间充质干细胞向肌成纤维细胞分化中的作用。方法：全髓培养法培养原代大鼠骨髓间充质干细胞,培养至第三代时用TGF－β1分组诱导培养,检测TGF－β1对大鼠BMSCs促纤维化的作用及该过程中不同浓度梯度TGF－β1诱导以及不同时间段miR－21的表达变化;通过转染miR－21 mimics（高表达）不同时间点检测其对α－SMA表达的影响。结果：TGF－β1能促进大鼠骨髓间充质干细胞向成纤维,肌成纤维细胞分化;大鼠骨髓间充质干细胞向成纤维,肌成纤维细胞分化后miR－21表达上调;上调miR－21能促进大鼠BMSCs的纤维化作用。结论：miR－21 mimics能够促进大鼠BMSCs的纤维化作用。     

Fibroblast-derived exosomal miRNA-133 promotes cardiomyocyte-like differentiation

ObjectiveTo investigate the role of exosomal miRNA-133 secreted by cardiac fibroblasts (CFs) in promoting cardiomyocyte differentiation.MethodsNeonatal rat CFs were cultured in vitro, and the cultured CFs were divided into three groups as follows: induction, miRNA-133 high expression, and miRNA-133 inhibition. miRNA-133 was transfected into CFs with lentivirus as a vector. CFs were transfected with the miRNA-133 inhibitor, and the markers of cardiomyocyte were detected through immunofluorescence staining, Western blotting, and real-time quantitative polymerase chain reaction (qRT-PCR) at 3, 8, and 14 days, respectively. The expression levels of cardiac troponin T (cTnT) and cardiac actin (α-actin) were determined, and qRT-PCR was used to detect the expression of miRNA-133 in the fibroblast exosomes.ResultsCFs subjected to immunofluorescence staining expressed vimentin and discoid domain receptor 2. The exosomes secreted by CFs were observed as small vesicles of 30–100 nm via transmission electron microscopy, and Western blotting was used to detect exosome-specific protein CD63 and CD9 expression. The expression levels of cTnT, α-actin, and exosomal miRNA-133 secreted into the supernatant of the miRNA-133 high-expression group increased gradually at different time points and reached the highest level at 14 days. The expression levels of cTnT, α-actin, and exosome miRNA-133 in the miRNA-133 inhibition group were the lowest.ConclusionThe exosomal miRNA-133, which is derived from CFs, can promote the differentiation of fibroblasts into cardiomyocyte-like cells.     

血清miRNA-182检测在结直肠癌中的诊断价值研究

目的探讨血清miRNA-182作为结直肠癌(CRC)潜在标志物的诊断价值。方法运用荧光定量PCR法检测53例CRC患者血清miRNA-182相对表达量,并与肠良性病变患者及健康体检者进行比较分析。结果 CRC患者血清miRNA-182相对表达量明显高于肠良性病变组及对照组,差异均有统计学意义(P0.05)。ROC曲线显示血清miRNA-182诊断CRC的曲线下面积为0.846,95%置信区间为0.768~0.925;诊断灵敏度为77.1%,特异度为81.1%。血清miRNA-182相对表达量与CRC患者TNM分期(P=0.011)及远距离转移(P=0.002)有关;而与其他临床特征无关。CRC患者术后血清miRNA-182相对表达量明显低于术前水平(P0.01);而术后出现复发/转移的患者血清miRNA-182相对表达量又明显升高(P=0.019)。结论 CRC患者血清miRNA-182相对表达量明显升高,并与病情及恶性进展密切相关,血清miRNA-182可作为CRC潜在标志物用于临床诊断及病情评估。     

New therapeutic opportunities for hepatitis C based on small RNA

Hepatitis C virus (HCV) infection is one of the major causes of chronic liver disease, including cirrhosis and liver cancer and is therefore, the most common indication for liver transplantation. Conventional antiviral drugs such as pegylated interferon-alpha, taken in combination with ribavirin, represent a milestone in the therapy of this disease. However, due to different viral and host factors, clinical success can be achieved only in approximately half of patients, making urgent the requirement of exploiting alternative approaches for HCV therapy. Fortunately, recent advances in the understanding of HCV viral replication and host cell interactions have opened new possibilities for therapeutic intervention. The most recent technologies, such as small interference RNA mediated gene-silencing, anti-sense oligonucleotides (ASO), or viral vector based gene delivery systems, have paved the way to develop novel therapeutic modalities for HCV. In this review, we outline the application of these technologies in the context of HCV therapy. In particular, we will focus on the newly defined role of cellular microRNA (miR-122) in viral replication and discuss its potential for HCV molecular therapy.     

Efficient inhibition of human cytomegalovirus UL122 gene expression in cell by small interfering RNAs

In order to develop a gene therapy to human cytomegalovirus (HCMV), RNA interference (RNAi) was employed to inhibit the expression of HCMV UL122 gene in vitro. Recombinant vector pUL122‐EGFP, which expressed UL122‐EGFP fusion protein, and recombinant vectors psi122‐1, psi122‐2 and psi122‐3, which expressed small interfering RNAs (siRNAs) targeted to UL122 were contransfected into AD293 cells. The fluorescence signal of pUL122‐EGFP was greatly suppressed by psi122‐1 and psi122‐2, with an inhibitory rate of 82.0% ± 1.0% and 79.5% ± 2.5%, respectively. The mRNA of pUL122‐EGFP of the cells transfected with psi122‐1 and psi122‐2 was decreased 97.3% ± 0.6% and 98.0% ± 0.1%, respectively. Vector psi122‐3 showed a slightly low suppression rate. Therefore, it may be concluded that plasmids encoding siRNAs targeted to UL122 is able to in vitro reduce markedly the expression of UL122‐EGFP. And it is very likely that the psi122‐1 and psi122‐2 are potentially efficacious siRNAs in the gene therapy of HCMV infection in vivo, in which further investigations are required. This study is expected to greatly facilitate the use of the RNAi technology for the anti‐HCMV studies. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

HeLa细胞中miRNA-214靶基因Mek3的确定

目的 探索miRNA-214在HeLa细胞中的与其靶基因Mek3相互作用.方法 通过miRNA靶基因预测网站寻找可能与miRNA-214相互作用的靶基因,合成miRNA-214和对照序列,将miRNA-214、对照序列、Mek3的3'非翻译区(3' UTR)以及突变的Mek3 3'UTR分别克隆到表达载体上,转染HeLa细胞,转染48 h后提取蛋白,检测绿色荧光蛋白的表达水平; HeLa细胞转染miRNA-214后,Trizol抽提RNA,通过荧光定量PCR检测Mek3 mRNA的表达水平;Western印迹检测Mek3的蛋白表达水平.经过以上实验从mRNA和蛋白水平上验证了在HeLa细胞中miRNA-214对靶基因Mek3的作用效应.结果 生物信息学方法显示miRNA-214和Mek3存在可能的结合位点.经过实验验证了miRNA-214可以下调Mek3的mRNA和蛋白水平.结论 miRNA-214可以负调节靶基因Mek3的表达.     

用聚乙二醇分离富集microRNA的方法探讨

目的 探讨用聚乙二醇(polyethylene glycol,PEG)溶液分离富集miRNA的操作方法和分离富集效果,并与Ambion公司的miRNA分离试剂盒分离效果进行比较.方法 用PEG溶液和Ambion公司的miRNA分离试剂盒从肝脏组织总RNA中分离富集miRNA,用变性琼脂糖和变性聚丙烯酰胺凝胶电泳鉴定分离效果,并在富集的miRNA中用RT-PCR扩增miR-122以鉴定是否有效地回收了miRNA.结果 PEG和Ambion公司的miRNA分离试剂盒都能有效地富集miRNA,PEG富集的RNA片段比Ambion公司的试剂盒的大.结论 PEG溶液能有效地分离富集miRNA,和Ambion公司的miRNA分离试剂盒分离效果相当,并具有操作简便、快捷及成本低廉的优点.