差异表达miRNA在胰腺癌预后判断中的价值

目的：分析胰腺癌组织和正常组织差异表达的miRNA,筛选与胰腺癌预后相关的生物标志。方法：下载并整理基因芯片表达汇编数据库（GEO）中GSE32678和GSE71533芯片数据集原始数据,应用R语言筛选差异表达miRNA,结合GSE24279数据集,获得差异表达的miRNA并取交集。应用生物信息学分析工具对交集miRNA进行靶基因预测,进而对靶基因进行功能分析,构建蛋白互作网络（PPI）、miRNA-mRNA调控网络、miRNA-mRNA-pathway调控网络,结合肿瘤基因组图谱数据库（TCGA）中胰腺癌样本的miRNA表达及预后数据,筛选出胰腺癌预后相关标志物。结果：共筛选出胰腺癌组织和正常组织22个交集miRNA,其中hsa-miR-30a-5p、hsa-miR-551a、hsa-miR-375与胰腺癌患者的生存预后密切相关。hsa-miR-125b-5p、hsa-miR-221-3p、hsamiR-31-5p、hsa-miR-222-3p、hsa-miR-10a-5p是miRNA-mRNA调控网络中的核心miRNA。结论：通过对GEO和TCGA数据库胰腺癌相关数据的分析发现hsa-miR-30a-5p、hsa-miR-551a、hsa-miR-375显著影响胰腺癌患者的预后,可以作为判断预后的标志。     

H3K4me3高表达与肝癌患者较差生存预后相关

目的:探讨检测肝癌组织中组蛋白第三亚基四号赖氨酸的三甲基化（H3K4me3）蛋白的表达与肿瘤病理特点和肝癌患者生存预后的相关性。方法:免疫组化和Western-blot检测H3K4me3和组蛋白甲基转移酶(SET and MYND domain-containing protein 3,SMYD3)在肝癌组织（n=168）和细胞株中的表达。此外,实验结果还在另外一个肝癌组织芯片（n=147）中进行验证。H3K4me3表达的最佳分界点（optimal cut-point）由X-tile程序确定,患者的预后由Kaplan-meier生存曲线描述。结果:H3K4me3高表达于肝癌细胞系和肝癌组织,其高表达与肝癌尤其是早期TNM1/2期患者的较差总体生存显著相关。单因素和多因素分析均提示H3K4me3表达水平是患者预后的独立危险因素。此外,H3K4me3和SMYD3在两组肝癌组织中均存在正相关表达。结论:H3K4me3表达水平能成为肝癌患者术后生存的预测因子,其高表达可能与SMYD3有关。     

骨肉瘤细胞和组织H3K27me3表达与临床病理特征相关性研究

目的 组蛋白H3K27三甲基化(H3K27me3)在肿瘤发生发展过程中起着重要作用,研究发现H3K27me3在肝癌和前列腺癌等恶性肿瘤中的表达和临床病理特征存在相关性,但其在骨肉瘤中的研究相对较少.本研究分析H3K27me3在骨肉瘤细胞和组织中的表达及其与临床病理的关系,并探讨H3K27me3在骨肉瘤发生和发展中的作用和意义.方法 所有切片均来自于河北医科大学第四医院骨科2005-01-01-2011 01-01手术切除的标本.采用蛋白印迹法检测骨肉瘤MG-63、U2-OS、Sa-OS细胞系及hFOB1.19成骨细胞中H3K27me3表达的水平差异;采用免疫组织化学染色方法检测53例骨肉瘤组织及16例骨软骨瘤组织中H3K27me3的表达水平.KaplawMeier分析比较H3K27me3高表达和低表达患者生存率之间的差异.并应用Cox回归模型分析其表达水平对预后影响.结果 hFOB1.19、MG-63、U2-OS和Sa-OS中H3K27me3蛋白表达水平分别为0.37±0.06、0.86±0.06、0.79±0.07和0.83±0.05,与hFOB1.19细胞中H3K27me3表达相比,3组骨肉瘤细胞系中H3K27me3蛋白表达水平均显著升高,P=0.023;与骨软骨瘤组织相比(56.3％),H3K27me3在骨肉瘤组织中高表达(84.9％),二者差异有统计学意义(P＜0.001),并与肿瘤大小、肺转移、Enneking分期和生存率有关,P值分别为0.037、0.020、0.023和0.046.且其表达水平与患者生存期显著相关,P=0.012.结论 H3K27me3在骨肉瘤细胞及骨肉瘤组织中呈高表达,并与肿瘤的临床病理特征相关,可能会是骨肉瘤患者重要的预后因子及治疗靶点.     

直肠腺癌组织中microRNA差异表达谱分析

目的 研究直肠癌及正常直肠黏膜中微小RNA（miRNA）表达谱差异,寻找并验证具有差异表达的miRNA。方法 提取3例直肠癌患者的癌组织及其对应远端正常直肠黏膜中的miRNA,采用微阵列芯片分析,获得直肠癌 miRNA表达谱。另取 15例直肠癌患者手术切除标本的癌组织及正常黏膜组织,采用实时定量RT-PCR法对其中具有表达差异的 hsa-miR-187*和hsa-miR-224进行进一步验证。结果 共筛选出70个直肠癌相关的差异表达miRNA,其中33个表达上调,37个表达下调。其中肿瘤/正常倍数小于0.5的有22个,肿瘤/正常倍数大于4的有17个。在另外15对验证样本中证实hsamiR-187*在直肠癌中表达下调（P<0.001）,hsa-miR-224表达上调（P<0.001）。结论 直肠癌和正常直肠黏膜相比有其特异的miRNA表达谱, miRNA在直肠癌的发生中可能起到重要作用。     

H3K9ac、H3K4me2在卵巢浆液性上皮性肿瘤中的表达及意义

目的:探讨组蛋白H3第9位赖氨酸残基乙酰化（H3K9ac）及组蛋白H3第4位赖氨酸残基二甲基化（H3K4me2）在卵巢浆液性囊腺瘤、卵巢交界性浆液性囊腺瘤和卵巢浆液性囊腺癌组织中蛋白表达与浆液性上皮性卵巢癌发生、发展的关系及两者之间有无相关性。方法:应用免疫组织化学链霉菌抗生物素蛋白-过氧化酶连接法（SP法）检测H3K9ac、H3K4me2在30例卵巢浆液性囊腺瘤组织、30例卵巢交界性浆液性囊腺瘤组织及40例卵巢浆液性囊腺癌组织中的表达,观察表达差异并进行统计学处理。结果:H3K9ac在卵巢浆液性囊腺瘤组织中阳性表达率为93.33%,在卵巢交界性浆液性囊腺瘤组织中阳性表达率为66.67%,在卵巢浆液性囊腺癌中阳性表达率为42.50%,良性、交界性、恶性组织间两两比较差异有统计学意义（P＜0.05）。在不同手术病理分期、不同组织学分级的卵巢浆液性囊腺癌组织中H3K9ac的阳性表达率有统计学差异（P＜0.05）。H3K4me2在卵巢浆液性囊腺瘤组织中阳性表达率为90%,在交界性浆液性囊腺瘤组织中阳性表达率为73.33%,在卵巢浆液性囊腺癌中阳性表达率为52.50%,良性与交界性、交界性与恶性组织间比较差异无统计学意义（P＞0.05）,良性与恶性组织间比较差异有统计学意义（P＜0.05）。在不同手术病理分期、不同组织学分级的卵巢浆液性囊腺癌组织中H3K4me2的阳性表达率无统计学差异（P＞0.05）。H3K9ac、H3K4me2在卵巢浆液性囊腺癌组织中的表达呈正相关（r=0.732,P＜0.001）。结论:H3K9ac、H3K4me2的低表达与浆液性上皮性卵巢癌的发生、发展有关,有可能成为浆液性上皮性卵巢癌诊断和治疗的新靶点。     

人肺腺癌吉非替尼获得性耐药株H1975细胞与敏感株PC9细胞miRNA谱表达差异

[目的]分析人肺腺癌吉非替尼耐药细胞株H1975(epidermal growth factor receptor,EGFR基因双突变)和人肺腺癌吉非替尼敏感细胞株PC9(EGFR单突变)细胞株微小RNA(microRNA,miRNA)表达谱的差异.[方法]用Agilent human miRNA芯片分别检测H1975细胞与PC9细胞株的miRNA表达谱,Agilent Feature Extraction软件分析并筛选表达差异达5倍以上的miRNA,生物学软件分析表达差异miRNA的可能靶基因.实时定量PCR(qRT-PCR)验证miRNA芯片结果.[结果]与PC9细胞相比,H1975细胞株中22个miRNA表达上调＞5倍,24个miRNA表达下调＞5倍.qRT-PCR结果验证了芯片的结果(上调的如hsa-miR-489,hsa-miR-210和hsa-miR-21等;下调的如hsa-miR-205,hsa-miR-200c和hsa-miR-155等),同时发现,其中33个异常表达的miRNA有潜在的靶基因,靶基因超过100个的有24个miRNA.[结论]H1975吉非替尼耐药与miRNA谱异常表达有关,miRNA可能通过调控靶基因而参与EGFR-TKI的获得性耐药.     

基于竞争内源性RNA网络探讨槲皮素在肺腺癌中的作用靶点

目的:利用从肺腺癌（LUAD）数据集中筛选的差异表达基因（DEGs）、差异表达lncRNA（DElncRNA）及其上游miRNA,构建LUAD的竞争内源性RNA网络（ceRNA）,探索槲皮素可能的作用靶点。方法:从基因表达综合数据库（GEO）及肿瘤基因组图谱数据库（TCGA）中检索并筛选LUAD基因及lncRNA表达数据集,对差异表达基因（DEGs）进行富集和功能注释。使用在线数据库预测miRNA及lncRNA,建立ceRNA调控网络,并通过网络药理学分析槲皮素的药物靶点。结果:构建了AURKA与上游hsa-miR-363-3p及AP000553.1、LINC00858、AL354707.1的ceRNA调控网络,槲皮素与5DOS对接良好。结论:AP000553.1、LINC00858、AL354707.1与hsa-miR-363-3p竞争性调控AURKA,进一步影响LUAD预后,槲皮素可作用于AURKA。     

不同海拔地区藏族胃癌患者miRNA的初步筛选

目的 筛选不同海拔地区生活的藏族患者的胃癌组织微小RNA(miRNA)差异表达,探讨高原地区外环境缺氧是否参与调控肿瘤的发生、侵袭和转移等.方法 选择5对不同海拔地区生活的藏族胃癌患者作为研究对象(其中海拔﹥3500 m者5例,海拔﹤2450 m者5例),对胃癌组织及其配对癌旁组织进行miRNA芯片检测,分析差异miRNA,查询差异miRNA-靶基因,预测的靶基因应用DAVID数据库进行功能富集分析(GO分析)和pathway富集分析.结果 在5对不同海拔地区生活的藏族胃癌患者的胃癌组织及其配对癌旁组织中找出16个差异表达的miRNA,在海拔﹥3500 m组均上调,仅有hsa-miR-1260b、hsa-miR-130b-3p、hsa-miR-3648、hsa-miR-4284预测到验证的靶基因,其中hsa-miR-1260b预测118个,hsa-miR-130b-3p预测151个.这些靶基因富集在细胞增殖、基因表达调控、转录调控、细胞周期、细胞内信号传导等生物学过程和功能上;pathway富集到癌症通路上.结论 在高原藏族胃癌患者的肿瘤生长、侵袭、转移及肿瘤耐药等过程中,hsa-miR-1260b、hsa-miR-130b-3p可能发挥着重要的作用.     

胃癌全基因组蛋白H3K27三甲基化水平的研究

 目的 研究胃癌肿瘤细胞全基因组蛋白H3K27的三甲基化水平。 方法 收集我科2007年10月～2008年1月间8例胃癌患者肿瘤组织和正常胃黏膜组织，采用染色质免疫沉淀联合芯片技术（ChIP-chip）在全基因组范围内对两种组织细胞的组蛋白H3K27进行高通量的检测。随后采用染色质免疫沉淀 实时定量聚合酶链反应（ChIP-qPCR）验证芯片结果，定量反转录聚合酶链反应（qRT-PCR）检测H3K27显著差异基因的mRNA表达水平。用统计软件进行基因筛选。 结果 两种组织细胞组蛋白H3K27三甲基化水平对比，筛选出234个基因存在H3K27显著差异，肿瘤细胞中有71个基因显示有H3K27三甲基化程度增高,161个基因H3K27甲基化程度降低；ChIP-qPCR验证结果与CpG岛芯片检测结果一致。 结论 和正常胃黏膜组织细胞相比，胃癌肿瘤细胞多个基因组蛋白H3K27三甲基化存在显著改变。ChIP-chip检测技术有利于进一步揭示胃癌肿瘤发生的分子机制，发现新的基因治疗靶点。     

Research on the Typical miRNA and Target Genes in Squamous Cell Carcinoma and Adenocarcinoma of Esophagus Cancer with DNA Microarray

To identify the typically expressed miRNAs in squamous cell carcinoma (SCC) and adenocarcinoma (ADC) of esophagus cancer and their target genes, and explore the related functions and pathways, providing potential biomarkers for esophageal carcinoma diagnosis and treatment. Gene expression profile GSE13937 was downloaded from Gene Expression Omnibus database which includes 152 samples, paired non-cancerous and cancerous, 44 SCC cases and 32 ADC cases; the differentially expressed miRNAs were identified with limma packages in R language after the data were normalized. Selected differentially expressed miRNAs were further analyzed using bioinformatics methods. Firstly, verified targets of miRNAs in two miRNA databases: miRecods and miRTarBase were integrated to select the targets genes of differentially expressed miRNAs. Next, String software was used to construct the target genes interaction network. Finally, function and pathway enrichment analysis of genes in the interaction network was carried out with Gestalt software. Up-regulated hsa-miR-21 and down-regulated hsa-miR-203 were identified by comparing normal and cancer tissue samples, and the targets genes regulated by these two miRNAs were most significantly related to cell cycle function and pathway, especially in the phase of G1/S. The two differentially expressed miRNA: hsa-miR-21 and hsa-miR-203 provide evidence for early diagnosis and treatment of esophageal carcinoma. The functions and pathways of target genes shows that deep understanding of cell cycle G1/S will help to illustrate the relationship between cell cycle regulation and pathogenesis of esophageal cancer.     

Loss of has-miR-337-3p expression is associated with lymph node metastasis of human gastric cancer

Background

Metastasis is the major cause of cancer-related death in patients with gastric cancer, and aberrant expression of various microRNAs (miRNAs) is associated with cancer metastasis.

Methods

Profiling of differentially expressed miRNAs was performed in three cases of primary gastric cancer and the corresponding metastatic lymph node tissues. Then, the five most altered miRNAs were further verified in 16 paired samples. Two of these five miRNAs were further assessed for their effects on the regulation of gastric cancer cell growth and invasion.

Results

The miRNA profile data showed 151 upregulated miRNAs (≥ 1.5-fold) and 285 downregulated miRNAs (≤ 0.67-fold) in the metastatic tissues compared to the primary gastric cancer tissues. Among these five miRNAs (i.e., hsa-miR-508-5p, hsa-miR-30c, hsa-miR-337-3p, hsa-miR-483-5p, and hsa-miR-134), expression of hsa-miR-337-3p and hsa-miR-134 was significantly downregulated in these 16 lymph node metastatic tissues compared to their primary tumor tissues (P<0.05) and in nine gastric cancer cell lines compared to the nonmalignant GES cell line. Furthermore, induction of hsa-miR-134 or hsa-miR-337-3p expression did not dramatically affect gastric cancer cell proliferation, but transfection of the hsa-miR-337-3p mimic did reduce gastric cancer cell invasion capacity.

Conclusions

These findings indicate that hsa-miR-337-3p plays a role in the reduction of gastric cancer cell invasion capacity, and further studies on the mechanism of hsa-miR-337-3p in gastric cancer metastasis are warranted.     

miR-586靶向TLR7调控食管癌细胞CaES-17的凋亡和增殖

目的:探讨miRNA调控食管癌细胞CaES-17的凋亡和增殖的潜在机制。方法:纳入2019年06月至2020年06月在我院接受治疗的食管癌患者6例,采集其食管癌组织和癌旁组织后抽取总RNA进行miRNA高通量测序。在食管癌细胞CaES-17中过表达食管癌组织和癌旁组织中的差异miRNA,检测食管癌细胞CaES-17的凋亡和增殖情况。通过TargentScan7.2在线分析和荧光素酶报告实验分析miRNA的靶标mRNA。结果:6例患者的食管癌组织和癌旁组织通过高通量测序发现hsa-miR-30d-5p、hsa-miR-6818-5p、hsa-miR-525-5p、hsa-miR-1909-3p、hsa-miR-212-5p、hsa-miR-586、hsa-miR-1286、hsa-miR-365b-3p、hsa-miR-30e-5p、hsa-miR-4317在食管癌组织和癌旁组织中的表达差异在8倍以上,并且食管癌组织均高于癌旁组织。干扰上述miRNA后,发现干扰miR-586能够抑制食管癌细胞CaES-17的增殖水平和迁移水平,提高凋亡水平。过表达miR-586后,食管癌细胞CaES-17的凋亡水平下降,增殖水平和迁移水平上升。TargentScan7.2在线分析和荧光素酶报告实验发现miR-586靶向TLR7的3' 端非编码区。敲低TLR7后,食管癌细胞CaES-17的凋亡水平下降,增殖水平和迁移水平上升。过表达TLR7后,食管癌细胞CaES-17的凋亡水平上升,增殖水平和迁移水平下降。但是,同时干扰miR-586和敲低TLR7后,相比于对照食管癌细胞,食管癌细胞CaES-17的凋亡水平和增殖水平无显著差异。结论:miR-586通过靶向TLR7的3' 端非编码区,降解了TLR7的mRNA,抑制了TLR7的蛋白翻译,最终抑制了食管癌细胞CaES-17的凋亡、促进了食管癌细胞CaES-17的增殖。     

Hsa-miR-125a-3p and hsa-miR-125a-5p are downregulated in non-small cell lung cancer and have inverse effects on invasion and migration of lung cancer cells

Background  

Two mature microRNAs (miRNAs), hsa-miR-125a-3p and hsa-miR-125a-5p (collectively referred to as hsa-miR-125a-3p/5p), are derived from 3' and 5' ends of pre-miR-125a, respectively. Although impaired regulation of hsa-miR-125a-5p has been observed in some tumors, the role of this miRNA in invasion and metastasis remains unclear, and few studies have examined the function of hsa-miR-125a-3p. In order to characterize the functions of hsa-miR-125a-3p/5p in invasion and metastasis of non-small cell lung cancer (NSCLC), we investigated the relationships between hsa-miR-125a-3p/5p expression and lymph node metastasis in NSCLC tissues. We also explored the impact of expression of these miRNAs on invasive and migratory capabilities of lung cancer cells.     

MicroRNA profiles in five pairs of early gastric cancer tissues and adjacent non-cancerous tissues

Approximately half of the world''s gastric cancer cases and deaths occur in China. In addition, the incidence and mortality rates of gastric cancer in Gansu province in China are much higher than the average nationwide levels. The present study investigated microRNA (miRNA/miR) profiles in early gastric cancer (EGC) without specific symptoms. miRNA expression levels in five pairs of EGC tissues and adjacent non-cancerous mucosa tissues of patients from Gansu province in China were analyzed using a miRNA microarray. A total of 47 differentially expressed miRNAs (DEMs) were identified. Subsequently, mRNA expression profiles of three pairs of cancer tissues and adjacent non-cancerous tissues from 3 Asian patients with stage I or stage II gastric cancer (stage I/II; American Joint Committee on Cancer classification, Eighth Edition) were obtained from The Cancer Genome Atlas database, and differentially expressed genes (DEGs) were identified. The target genes of DEMs were filtered from the DEGs using the miRDB database and a miRNA-gene network was constructed. The functions of DEMs were evaluated using the tool for annotations of human miRNAs database, and via Gene Ontology analysis, Kyoto Encyclopedia of Genes and Genomes analysis and Gene Set Enrichment Analysis of the target genes. Finally, survival analyses of DEMs, which were in the miRNA-gene network, was performed. The results suggested that a number of miRNAs, including hsa-let-7a-5p, hsa-miR-27a-3p, hsa-miR-126-5p and hsa-miR-424-5p, may serve critical roles in EGC. The present study could provide a basis for the identification of EGC screening biomarkers. Furthermore, the present study may provide a basis for the exploration of the cause of the high incidence of gastric cancer in Gansu province from the perspective of miRNAs.