胃癌组织中血管生成素样蛋白2和miR-211表达水平与其预后的关系

目的 探讨胃癌组织中血管生成素样蛋白2(ANGPTL2)和miR-211表达水平与其预后的关系.方法 采用免疫组化法检测胃癌根治术治疗的62例患者胃癌组织及其相应癌旁组织中ANGPTL2和miR-211的表达水平,并分析其对胃癌患者预后的影响.结果 胃癌组织中ANGPTL2和miR-211阳性表达率分别为88.71%和83.87%,均显著高于其癌旁正常组织的3.23%和8.06%(P<0.05).62例患者随访3年的复发率、无病生存期(DFS)和3年生存率分别为45.16%、(16.62±4.78)个月和62.90%,且ANGPTL2和miR-211阳性表达患者的复发率高于阴性表达患者,DFS短于阴性表达患者,3年生存率则低于阴性表达患者(P<0.05).logistic线性回归分析结果显示,胃癌组织中ANGPTL2和miR-211阳性表达率均可明显影响其预后情况(P<0.05).结论 胃癌组织中ANGPTL2和miR-211阳性表达率较高且可影响其复发率、DFS和3年生存率等预后情况,胃癌组织中ANGPTL2和miR-211阳性表达可能作为其不良预后评估的参考指标.     

靶向miR-221 siRNA表达载体的构建及有效靶序列的筛选和表达

目的 构建靶向miR-221的siRNA表达载体,同时筛选出一条抑制效率最好的靶序列,为研究RNAi在哺乳动物细胞内抑制靶基因表达奠定基础.方法 根据siRNA靶点设计的原则运用相关软件设计靶序列并合成其表达框,连接入siRNA表达质粒pGCSIL-GFP,同时构建miR-221表达载体pEGFP-miR-221,共同转染293T细胞,Western blot检测转染后293T细胞中Flag蛋白表达,间接反映各靶序列抑制效率,最后将筛选出的抑制效率最好的质粒转染U87胶质瘤细胞,应用细胞增殖曲线及流式细胞仪检测其对U87细胞生长的影响.结果 重组质粒经测序鉴定证明各转录模板完整、正确插入到相应质粒中,并筛选出1号靶序列对miR-221抑制率最高,该组Flag蛋白的表达量仅为对照组的34.3%,同时该序列能有效抑制U87胶质瘤细胞的生长并诱导细胞凋亡,凋亡率达21.89%.结论 成功构建了靶向miR-221的siRNA 表达载体,并筛选出一个抑制效率最好的序列,在体外实验中该序列能有效抑制U87细胞的生长.     

URSA患者绒毛组织中细胞凋亡及血管新生异常与miR-155表达的关系

目的:探究URSA患者绒毛组织中细胞凋亡及血管新生异常与miR-155表达的关系.方法:选择2014年1月~2015年1月来我院妇产科行清宫术后的孕妇的标本64例,其中URSA患者38例,剩余26例,将64例患者按照是否为URSA患者分为两组,即URSA组、对照组.对miR-155的表达量与细胞凋亡分子Bcl-2、Bcl-xl及血管新生分子VEGF、HIF-1α、sFlt-1的表达量记录,并与miR-155的表达量进行对比.结果:miR-155的表达量与细胞凋亡分子Bcl-2、Bcl-xl的表达量呈正相关,与血管新生分子VEGF、HIF-1α的表达量呈正相关,与sFlt-1的表达量呈负相关,且两组患者的miR-155、Bcl-2、Bcl-xl的表达量不同,URSA组显著低于对照组,且URSA组miR-155、VEGF、HIF-1α的表达量显著低于对照组,sFlt-1的表达量则显著高于对照组.结论:URSA绒毛组织中细胞的凋亡及血管新生与miR-155存在关系,且miR-155的表达量下降则会导致绒毛组织中的细胞过度凋亡.     

miR-146a和miR-196a2前体区遗传多态性与焦炉工人遗传损伤的关系

目的 探讨miR-146a和miR-196a2前体区遗传多态位点rs2910164 G＞C和rs11614913 T＞C与焦炉工遗传损伤的关联性.方法 于2010年9月至10月,选取湖北省武汉市某焦化厂工龄在1年以上,无肿瘤,无吸烟习惯的焦炉作业工人,共575名.收集一般人口学资料并采集外周静脉血和尿液;采用胞质分裂阻滞试验计算外周血淋巴细胞的微核率来评价染色体损伤的程度;采用TaqMan探针对miR-146a前体区rs2910164 G＞C和miR-196a2前体区rs11614913 T＞C多态位点进行分型分析;采用三明治ELISA测定血浆中苯并[a]芘二氢二醇环氧化物-白蛋白(BPDE-白蛋白)加合物的浓度;并进行数据分析,并计算频率比(FR)及其95％ CI值.结果 共纳入575名工人.与携带野生型rs2910164 GG基因型的工人的外周血淋巴细胞微核率(4.02±3.09)相比,携带rs2910164CC基因型工人的微核率(4.38±3.46)增加(FR=1.18,95％CI:1.04～1.34),且有明显的等位基因剂量-效应关系(P趋势=0.025).按研究对象不同特征分层后,发现男性(FR=1.11,95％ CI:1.02～ 1.20)、不饮酒(FR=1.07,95％ CI:1.00 ～1.14)、工龄＜20年(FR=1.12,95％CI:1.03 ～ 1.22)和低BPDE-白蛋白水平组(FR=1.11,95％CI:1.02～1.21)中,rs2910164C等位基因与微核率的增加具有等位基因剂量-效应关系(P趋势分别为0.011、0.044、0.006和0.020).此外,与携带rs11614913TT基因型的工人(3.90±3.32)相比,携带rs11614913 TC基因型工人的外周血淋巴细胞微核率增加(4.27±2.91)(FR=1.12,95％CI:1.02 ～ 1.23).以同时携带rs2910164 GG及rs11614913TT基因型的工人组作为对照,同时携带rs2910164CC与rs11614913 CC基因型个体的外周血淋巴细胞微核率(5.32±4.94)是对照组(3.75±3.01)的1.51(1.21 ～1.89)倍.结论 miR-146a前体区域rs2910164C等位基因及miR-196a2前体区域rs11614913 C等位基因与焦炉工遗传损伤水平增加有关.     

miR-146a靶向TRAF6继而抑制AR42J细胞的增殖及凋亡

目的 探究miR-146a对胰腺腺泡细胞AR42J增殖及凋亡的影响。方法 通过雨蛙素诱导AR42J细胞构建急性胰腺炎模型,酶联免疫吸附实验（ELISA）检测细胞上清液中淀粉酶、TNF-α、IL-6含量验证模型构建,qRT-PCR与Western blot分别检测各组中miR-146a和TRAF6表达量的改变。转染敲低AR42J细胞中miR-146a表达量,采用Edu检测细胞敲低后增殖改变,流式细胞术检测凋亡能力改变。结果 与未处理组相比,雨蛙素组细胞miR-146a表达量显著降低（P <0.05）,TRAF6表达量明显升高（P <0.05）,并且敲低miR-146a后AR42J细胞增殖能力明显降低,凋亡能力明显升高。结论 miR-146a可能通过抑制TRAF6表达从而降低AR42J细胞凋亡并促进细胞增殖能力。     

LncRNA HIF1A-AS2 accelerates malignant phenotypes of renal carcinoma by modulating miR-30a-5p/SOX4 axis as a ceRNA

Objective: Several reports have proposed that lncRNAs, as potential biomarkers, participate in the progression and growth of malignant tumors. HIF1A-AS2 is a novel lncRNA and potential biomarker, involved in the genesis and development of carcinomas. However, the molecular mechanism of HIF1A-AS2 in renal carcinoma is unclear.Methods:The relative expression levels of HIF1A-AS2 and miR-30a-5p were detected using RT-qPCR in renal carcinoma tissues and cell lines. Using loss-of-function and overexpression, the biological effects of HIF1A-AS2 and miR-30a-5p in kidney carcinoma progression were characterized. Dual luciferase reporter gene analysis and Western blot were used to detect the potential mechanism of HIF1A-AS2 in renal carcinomas.Results:HIF1A-AS2 was upregulated in kidney carcinoma tissues when compared with para-carcinoma tissues (P < 0.05). In addition, tumor size, tumor node mestastasis stage and differentiation were identified as being closely associated with HIF1A-AS2 expression (P < 0.05). Knockdown or overexpression of HIF1A-AS2 either restrained or promoted the malignant phenotype and WNT/β-catenin signaling in renal carcinoma cells (P < 0.05). MiR-30a-5p was downregulated in renal cancers and partially reversed HIF1A-AS2 functions in malignant renal tumor cells. HIF1A-AS2 acted as a microRNA sponge that actively regulated the relative expression of SOX4 in sponging miR-30a-5p and subsequently increased the malignant phenotypes of renal carcinomas. HIF1A-AS2 showed a carcinogenic effect and miR-30a-5p acted as an antagonist of the anti-oncogene effects in the pathogenesis of renal carcinomas.Conclusions:The HIF1A-AS2-miR-30a-5p-SOX4 axis was associated with the malignant progression and development of renal carcinoma. The relative expression of HIF1A-AS2 was negatively correlated with the expression of miR-30a-5p, and was closely correlated with SOX4 mRNA levels in renal cancers.     

miR-211对高糖诱导下晶状体上皮细胞氧化应激反应的调控作用

目的 探讨miR-211对高糖诱导下晶状体上皮细胞氧化应激反应的调控作用及其可能存在的作用机制.方法 将HLEC-B3细胞在含不同浓度(0、10、20、40 mmol/L)葡萄糖的培养基中培养48 h,RT-PCR检测细胞miR-211表达,Western blot检测细胞SIRT1蛋白表达,试剂盒检测总抗氧化能力(T...     

miR-146b对急性呼吸窘迫综合征大鼠肺组织中ICAM-1表达的调控作用

目的:探讨miR-146b对急性呼吸窘迫综合征(ARDS)大鼠肺组织中细胞间黏附分子1(ICAM-1)表达的影响,阐明miR-146b治疗ARDS的分子机制.方法:采用尾静脉注射油酸法建立ARDS大鼠模型,并将建模成功的大鼠分为模型组(只给予油酸)、agomir阴性对照组和miR-146b agomir组,每组15只,...     

The homeostatic malfunction of a novel feedback pathway formed by lncRNA021545, miR-330-3p and epiregulin contributes in hepatocarcinoma progression via mediating epithelial-mesenchymal transition

A better understanding of tumor metastasis is urgently required for the treatment and prognosis of hepatocarcinoma patients. Current work contributes a novel ceRNA feedback regulation pathway composed of epiregulin (EREG), microRNA-330-3p (miR-330-3p) and long non-coding RNA 021545 (lncRNA021545) in regulating hepatocarcinoma malignancy via epithelial-mesenchymal transition (EMT) process. Closely correlated, the deficiencies of EREG and lncRNA021545 and the overexpression of miR-330-3p were involved in the clinical progression of hepatocarcinoma. In vitro results showed that 1) lncRNA021545 downregulation promoted, 2) miR-330-3p dysexpression positively correlated, and 3) EREG dysexpression reversely correlated with the migratory and invasive properties of hepatocarcinoma HCCLM3 and Huh7 cell lines. By directly binding to EREG and lncRNA021545, miR-330-3p expression change reversely correlated with their expressions in HCCLM3 and Huh7 cells, which was also confirmed in primary tumors from HCCLM3-xenograft mice in responding to miR-330-3p change. LncRNA021545 and EREG positively regulated each other, and lncRNA021545 negatively regulated miR-330-3p, while, EREG dysregulation unchanged miR-330-3p expression in hepatocarcinoma cells. Furthermore, systemic in vitro cellular characterizations showed that the malfunctions of the three molecules mediated the invasiveness of hepatocarcinoma cells via EMT process through affecting the expressions of E-cadherin, N-cadherin, vimentin, snail and slug, which was further confirmed by in vivo miR-330-3p promotion on the tumorigenicity and metastasis of HCCLM3 bearing nude mice and by in vitro miR-330-3p promotion on the migration and invasion of hepatocarcinoma cells to be antagonized by EREG overexpression through acting on EMT process. Our work indicates, that by forming a circuit signaling feedback pathway, the homeostatic expressions of lncRNA021545, miR-330-3p and EREG are important in liver health. Its collapse resulted from the downregulations of lncRNA021545 and EREG together with miR-330-3p overexpression promote hepatocarcinoma progression by enhancing the invasiveness of tumor cells through EMT activation. These discoveries suggest that miR-330-3p/lncRNA021545/EREG axis plays a critical role in hepatocarcinoma progression and as a candidate for its treatment.     

替罗非班通过上调miR-22保护ox-LDL诱导的脐静脉内皮细胞损伤

目的 探讨替罗非班对氧化型低密度脂蛋白(ox-LDL)诱导的脐静脉内皮细胞(EA.hy926)损伤的影响和可能机制.方法 采用低、中、高剂量的替罗非班作用于ox-LDL诱导的EA.hy926细胞,采用细胞计数法(CCK-8)、流式细胞术分别检测细胞活力和凋亡.实时荧光定量PCR(qRT-PCR)检测miR-22表达水平...