lncRNA MLK7-AS1通过抑制miR-375的表达促进胶质瘤U251细胞的增殖和侵袭

目的 探讨长链非编码RNA（lncRNA）MLK7-AS1在人脑胶质瘤组织中表达及其对胶质瘤U251细胞增殖、侵袭的影响。方法 选择2016~2017年手术切除的脑胶质瘤组织标本45例，2007版WHO分级Ⅰ级8例，Ⅱ级15例，Ⅲ级10例，Ⅳ级12例。另选择其中10例瘤旁正常脑组织作对照。体外培养U251细胞和人正常星形胶质细胞（NHA）。U251细胞根据转染质粒分成四组:转染miR-375 mimic组、转染si-MLK7-AS1组、同时转染miR-375 inhibitor和si-MLK7-AS1组以及只转染miR-375 inhibitor组。RT-qPCR检测MLK7-AS1和miR-375的表达水平；荧光素酶报告基因实验验证MLK7-AS1与miR-375之间的关系；CCK-8法检测U251细胞增殖活性，Transwell实验检测U251细胞侵袭能力。结果 高级别胶质瘤组织MLK7-AS1表达水平明显高于低级别胶质瘤组织（P<0.05），而后者明显高于瘤旁正常脑组织（P<0.05）；高级别胶质瘤组织miR-375表达水平明显低于低级别胶质瘤组织（P<0.05），而后者明显低于瘤旁正常脑组织（P<0.05）。U251细胞MLK7-AS1表达水平明显高于NHA（P<0.05），miR-375表达水平明显低于NHA（P<0.05）。序列分析显示MLK7-AS1和miR-375 存在特异性结合序列，荧光素酶报告基因实验表明U251细胞MLK7-AS1负调控miR-375表达。沉默MLK7-AS1表达通过上调miR-375表达明显抑制U251细胞增殖和侵袭（P<0.05）。结论 lncRN AMLK7-AS1可能通过调节miR-375的表达水平在人脑胶质瘤中发挥着促癌的作用     

急性髓系白血病患者血清miR-370、miR-203的表达及临床意义

目的:探讨microRNA-370(miR-370)、microRNA-203(miR-203)在急性髓系白血病(AML)患者血清中的表达情况,并分析其临床诊断和预后意义。方法:选取AML患者57例为实验组,健康体检者21例作为对照组。采集各组人员的空腹静脉血,采用实时荧光定量PCR法检测各组miR-370、miR203的表达量。绘制受试者工作特征(ROC)曲线以评估血清miR-370、miR-203的诊断值,Kaplan-Meier方法用于估计表达与总生存率的关系。结果:与健康对照组比较,AML患者血清miR-370表达水平显著降低(P<0.05),血清miR-203表达亦显著降低(P<0.05)。ROC曲线分析表明,血清miR-370、miR-203的表达均可用于区分AML患者与健康者,miR-370的ROC曲线下面积为0.909,灵敏度和特异性分别为91.46%和100.00%;miR-203的ROC曲线下面积为0.895,灵敏度和特异性分别为83.45%和89.71%。结果显示,血清miR-370、miR-203水平与AML患者的总体存活率密切相关。结论:miR-370、miR-203在AML患者的血清中表达降低,有可能作为AML诊断和预后的新标志物。     

RNA Biomarker Release with Ultrasound and Phase-Change Nanodroplets

Microbubbles driven by ultrasound are capable of permeabilizing cell membranes and allowing biomarkers or therapeutics to exit from or enter cancer cells, respectively. Unfortunately, the relatively large size of microbubbles prevents extravasation. Lipid-based perfluorobutane microbubbles can be made seven-fold smaller by pressurization, creating 430-nm nanodroplets. The present study compares microbubbles and nanodroplets with respect to their ability to enhance miR-21 and mammaglobin mRNA release from cultured ZR-75-1 cells. Mammaglobin mRNA and miR-21 release increased with escalating concentrations of nanodroplets up to, respectively, 25- and 42-fold with 2% nanodroplets (v/v), compared with pre-ultrasound levels, whereas cell viability decreased to 62.4%. Sonication of ZR-75-1 cells incubated with microbubbles or nanodroplets caused relatively similar levels of cell death and miR-21 release, suggesting that nanodroplets are similar to microbubbles in enhancing cell permeability, but may be more advantageous because of their smaller size, which may allow extravasation through leaky tumor vasculature.     

Down-regulation of microRNA-27b promotes retinal pigment epithelial cell proliferation and migration by targeting Nox2

Aberrant proliferation and migration of retinal pigment epithelium (RPE) cells contributes to the pathology of various ocular diseases. miR-27b has been reported to be crucial in the regulation of cell differentiation, proliferation, apoptosis, and migration. However, the role of miR-27b on RPE proliferation and migration remains largely unknown. Here the effect of miR-27b on ARPE-19 cells under platelet-derived growth factor (PDGF)-BB stimulation was explored. In this study, we found that the expression level of miR-27b was significantly reduced in ARPE-19 cells under PDGF-BB stimulation. Ectopic expression of miR-27b remarkably inhibited PDGF-BB-induced proliferation and migration in ARPE-19 cells. Furthermore, bioinformatic analysis and luciferase reporter assay showed that NADPH oxidase 2 (Nox2) was a direct target for miR-27b, and that knockdown of Nox2 expression mimicked the inhibitory effect of miR-27b on PDGF-BB ?induced proliferation and migration in ARPE-19 cells, whereas, restoration of Nox2 expression showed an opposite effect. In addition, the ROS production and the activation of P13K/AKT/mTOR signaling induced by PDGF-BB were also suppressed by miR-27b overexpression or Nox2 silencing. Thus, these findings indicated that miR-27b exerted its protective role in RPE cells under PDGF-BB stimulation was partially through regulation of Nox2 and its downstream P13K/AKT/mTOR signaling, which might be a potential therapeutic approach for treatment of diseases caused by RPE proliferation, and migration.     

狼疮性肾炎肾血管损害和miR-145的表达

目的评估狼疮性肾炎(LN)患儿肾血管损害(RVLs)并检测肾血管中mi R-145的表达。方法收集41例经肾活检证实为LN的系统性红斑狼疮(SLE)患儿的临床资料,评估肾小球损害和RVLs。根据RVLs评分及病理类型分组。采用原位杂交法检测mi R-145在肾血管中的表达。比较不同病理分型组间RVLs、肾血管mi R-145表达及肾小球损害评分差异;比较不同RVLs组间临床指标、肾小球损害评分及肾血管mi R-145表达差异。结果不同LN病理类型间,RVLs的差异无统计学意义(P0.05),肾血管mi R-145表达及肾小球损害评分差异有统计学意义(P0.01)。不同RVLs组间,临床指标及肾小球损害差异均无统计学意义(P0.05),而肾血管mi R-145表达差异有统计学意义(P0.01)。结论 LN患儿存在RVLs,mi R-145可能参与RVLs的发生机制。     

肝硬化患者血清miR-122的表达及与Child-Pugh分级的关系

目的探讨肝硬化患者血清MicroRNA(miR)-122的表达水平与肝硬化Child-Pugh分级及并发症的关系。方法肝硬化患者87例,采用PCR实时荧光定量法测定患者血清miR-122水平,根据Child-Pugh分级对肝硬化患者进行分级,分析血清miR-122与肝硬化分级的关系。结果并发肝硬化腹水、消化道出血、自发性细菌性腹膜炎及失代偿期患者血清miR-122表达水平均高于未发生患者(P<0.05);不同肝硬化Child-Pugh分级血清中miR-122水平有统计学差异(P<0.05),A级与B级肝硬化患者血清miR-122水平无显著差异(P>0.05),A级和B级患者水平均显著低于C级(P<0.05)。多变量线性相关性显示,血清miR-122与丙氨酸氨基转移酶(ALT)、天门冬氨酸氨基转移酶(AST)、γ-谷氨酰转移酶(GGT)、碱性磷酸酶(ALP)呈正相关(P<0.05);与国际标准化比值(INR)及肌酐(Cr)水平呈负相关(P<0.05)。结论血清miR-122水平上升提示肝硬化已经失代偿,并与腹水、消化道出血、肝肾衰竭有关。因此,血清miR-122可作为评价肝硬化患者肝脏功能及预后的潜在生物学指标。     

MiR-876-5p acts as an inhibitor in hepatocellular carcinoma progression by targeting DNMT3A

Hepatocellular carcinoma (HCC) is one of the biggest challenges that human beings faced with in 21st century. Previous researches have revealed that miRNAs can serve as regulators in various cancers. MiR-876-5p, a member of miRNA family, has been studied in lung cancer for its anti-oncogenic function. However, the exact function of it is not reported in HCC. Our study aims to find out the effects of miR-876-5p expression on HCC progression. Two HCC cells were chosen to do functional assays after miR-876-5p expression was detected in cell lines by qRT-PCR. HepG2 cell was transfected with miR-876-5p mimics, whereas LM3 cell was transfected with miR-876-5p inhibitors. Next, cell activities of these two indicated cells were analyzed by means of MTT assay, colony forming assay, transwell migration assay and western blot analysis. Consequently, we found that miR-876-5p could inhibit both cell proliferation and metastasis. Moreover, we found out a target gene (DNMT3A) of miR-876-5p by performing bioinformatics analysis, dual luciferase reporter assay and biotin-avidin pull-down assay. Finally, rescue assays were carried out in HepG2 cells. We found that DNMT3A could reverse miR-876-5p mimics-induced inhibition. Therefore, we concluded that miR-876-5p suppressed hepatocellular carcinoma progression by targeting DNMT3A.     

mTOR负调控miR-27a并通过靶向降低GP73抑制人肝癌细胞侵袭

目的探索m TOR促进肝癌细胞侵袭能力机理。方法使用q-PCR方法检测miR-27a和GP73表达;将miR-27a的mimic转染GP73高表达的M97H细胞中,并将miR-27a inhibitor转入GP73低表达Hep G2细胞中,q-PCR和Western blot观察GP73的表达;使用荧光素酶报告基因系统验证miR-27a在GP73的3UTR区的结合位点;将miR-27a mimic转染GP73高表达的M97H细胞和GP73低表达的Hep G2细胞,Transwell实验观察细胞的侵袭。结果m TOR下调miR-27a,并上调GP73的表达;miR-27a下调GP73的表达,抑制miR-27a则上调GP73;GP73是miR-27a的靶基因;miR-27a显著抑制M97H细胞的侵袭,但对Hep G2细胞无抑制效果。结论 m TOR负调控的miR-27a靶向GP73抑制肝癌细胞的侵袭。     

高良姜素对H_2O_2诱导A375细胞氧化损伤的保护作用

目的探讨高良姜素对人A375黑素瘤细胞氧化损伤的保护作用。方法以700μmol·L-1的H2O2处理人A375黑素瘤细胞,建立氧化损伤模型,并以1,5和10μg·mL-1的高良姜素拮抗其作用。用倒置显微镜观察细胞形态;采用MTT比色法检测细胞存活率;并检测各组细胞上清液中丙二醛(MDA)、总抗氧化能力(T-AOC)、过氧化氢酶(CAT)、一氧化氮合酶(NOS)、超氧化物歧化酶(SOD)和谷胱甘肽过氧化物酶(GSH-PX)。结果高良姜素能明显改善H2O2损伤后的A375细胞形态,显著提高人A375黑素瘤细胞的存活率。与模型组相比,高良姜素给药后均能提高A375细胞T-AOC、CAT、SOD和GSH-Px活力(P<0.05),而MDA和NOS明显降低(P<0.05)。结论高良姜素对H2O2诱导的A375细胞氧化损伤具有保护作用。     

miR-126抑制结肠癌增殖及侵袭转移的功能研究

目的：研究 miR-126在体内是否具有抑制结肠癌细胞增殖及侵袭转移的功能。方法利用慢病毒载体构建稳定过表达miR-126的结肠癌细胞系 HCT116,将实验组及对照组细胞分别进行裸鼠皮下及尾静脉成瘤体内实验。结果成功构建稳定过表达 miR-126细胞系 HCT116;裸鼠皮下成瘤实验结果显示过表达 miR-126实验组皮下移植瘤瘤体平均体积明显小于其对照组瘤体体积（P ＜0．05）;尾静脉成瘤组中稳定过表达 miR-126实验组肺部转移灶的平均数目、面积均明显小于其对照组（P＜0．05）。结论裸鼠移植瘤实验证实 miR-126在体内具有抑制结肠癌细胞增殖及侵袭转移的作用。