lncRNA LUADT1靶向miR-138-5p调控胶质瘤细胞的增殖、迁移和侵袭

目的:探讨肺腺癌相关转录本1(LUADT1)对胶质瘤细胞的增殖、迁移和侵袭的影响及分子机制.方法:将si-NC、si-LUADT1、miR-NC、miR-138-5p、pcDNA、pcDNA-LUADT1分别转染至U251细胞中,记为si-NC组、si-LUADT1组、miR-NC组、miR-138-5 p组、pcDN...     

miR-205-5p/E2F1信号抑制经典Wnt/β蛋白通路调控脑胶质瘤细胞放射敏感性

目的 探索miR-205-5p/E2F1信号轴在脑胶质瘤U251、U87细胞放射耐受中的调控机制。方法 利用X射线逐步递增递间歇诱导方法照射U251、U87细胞,建立放射耐受的U251/TR、U87/TR细胞。对两种细胞进行形态学、细胞运动、侵袭及增殖能力分析。通过荧光素酶基因检测系统及点突变技术分析E2F1基因对U251/TR、U87/TR细胞的调控机制。结果 放射耐受的U251/TR、U87/TR细胞分别比251、U87细胞的增殖活力增强,运动、侵袭能力增强,X射线照射下细胞凋亡下降。miR-205-5p mimics转染能够下调U251/TR细胞E2F1因子表达,抑制细胞增殖、侵袭及运动,增加放射敏感性。miR-205-5p mimics转染协同E2F1下调是通过抑制细胞Wnt/β-catenin信号通路活性发挥抑制肿瘤作用,并降低细胞耐受。结论 逐步递增递间歇诱导方法能较好地建立U251/TR、U87/TR细胞。miR-205-5p/E2F1信号轴通过经典Wnt/β-catenin信号通路发挥抑癌作用,可以作为提高胶质瘤放射敏感性的治疗靶点。     

HOTAIRM1靶向miR-129-5p对胶质瘤细胞增殖、迁移、侵袭的影响

目的:研究长链非编码RNA HOTAIRM1（lncRNA HOTAIRM1）与微小RNA-129-5p（miR-129-5p）的靶向关系及其对胶质瘤细胞增殖、迁移、侵袭的影响。 方法:荧光定量PCR（qPCR）检测HOTAIRM1和miR-129-5p在人正常脑组织和胶质瘤组织中的表达。建立抑制HOTAIRM1表达细胞株,研究其对U251细胞增殖、凋亡、迁移及侵袭的影响。MTT法检测细胞增殖;流式细胞仪检测细胞凋亡;Transwell小室法检测细胞迁移和侵袭;蛋白质印迹法（Western blot）检测细胞周期蛋白D1（Cyclin D1）、p21、B细胞淋巴瘤/白血病-2（Bcl-2）和Bcl-2相关X蛋白（Bax）、上皮钙黏素（E-cadherin）、基质金属蛋白酶-2（MMP-2）水平。生物学信息预测和双荧光素酶报告基因法分析HOTAIRM1和miR-129-5p之间的靶向关系。共转染si-HOTAIRM1和anti-miR-129-5p,观察抑制miR-129-5p表达对抑制HOTAIRM1表达诱导的U251细胞增殖、凋亡、迁移及侵袭的影响。 结果:HOTAIRM1在胶质瘤组织中的表达明显上调（P<0.05）,miR-129-5p表达下调（P<0.05）。抑制HOTAIRM1表达显著降低U251细胞24 h、48 h、72 h的细胞活性、迁移细胞数、侵袭细胞数及Cyclin D1、Bcl-2、MMP-2蛋白表达量（P<0.05）,明显增加U251细胞凋亡率和p21、Bax、E-cadherin蛋白表达量（P<0.05）。miR-129-5p是HOTAIRM1的靶基因。上调或下调HOTAIRM1表达明显调控miR-129-5p表达（P<0.05）。抑制miR-129-5p表达逆转了抑制HOTAIRM1表达对U251细胞24 h、48 h、72 h的细胞活性、迁移细胞数、侵袭细胞数及Cyclin D1、MMP-2、Bcl-2蛋白表达的抑制作用,并逆转了抑制HOTAIRM1表达对U251细胞p21、E-cadherin、Bax蛋白表达和细胞凋亡率的促进作用。 结论:lncRNA HOTAIRM1通过靶向miR-129-5p影响胶质瘤细胞增殖、凋亡、迁移和侵袭。     

MiR-128-3p靶向抑制HOXA5调控多形性胶质母细胞瘤的增殖、侵袭与凋亡

目的 探索HOXA5在胶质母细胞瘤（GBM）中高表达的原因及miR-128-3p调控胶质母细胞瘤进展的分子机制。方法 通过慢病毒转染上调或下调U87细胞中miR-128-3p的表达水平,再利用蛋白质免疫印迹法检测HOXA5的表达水平的变化来探索miR-128-3p与HOXA5在GBM中表达的相关性。利用双荧光素报告基因实验验证miR-128-3p对HOXA5的靶向抑制关系。利用miR-128-3p与HOXA5过表达的质粒转染U87细胞进行拯救实验,通过CCK-8、Transwell、流式细胞学分析与裸鼠体内实验验证miR-128-3p调控GBM增殖、侵袭及凋亡方面的分子机制。结果 上调U87细胞中miR-128-3p表达后HOXA5的表达水平显著下降,下调U87细胞中miR-128-3p表达后HOXA5表达水平明显升高（P<0.05）,两者表达呈显著负相关。miR-128-3p可靶向结合HOXA5基因的3’UTR区并抑制HOXA5表达。miR-128-3p+Control组U87细胞增殖、侵袭及抗凋亡能力显著下降。结论 miR-128-3p可通过靶向抑制HOXA5负向调控GBM细胞的增殖、侵袭及抗凋亡能力,HOXA5在GBM中呈高表达与miR-128-3p表达水平降低有关。     

Involvement of EGFR,ERK-1,2 and AKT-1,2 Activity on Human Glioma Cell Growth

GBM (Glioblastoma multiforme) is the  most prevalent and lethal primary brain tumor. Gene therapy is one of the promising approaches and  involves the delivery of genetic therapeutic molecules for specific antitumour response/activity. miRNAs can regulate the cell biology functions including replication, cell growth, and apoptosis by regulating gene expression. In this study, we found that down-regulation of miR-4731 expression occurred in GBM cells. We further determined that miR-4731 behaved as a tumor suppressor by inhibiting GBM cell proliferation. We further investigated the molecular mechanisms of miR-4731 and EGFR, ERK-1,2 and AKT-1,2 in GBM cell lines U87 and U251. The in vitro ectopic expression of miR-4731 affected cell proliferation, migration, and invasion of U87 and U251 cells. Luciferase reporter assays validated that miR-4731 targeted the 3′-untranslated region (3′-UTR) of EGFR. In conclusions, we identified that miR-4731 plays a tumor suppressor role in GBM cell proliferation and migration by targeting EGFR expression, and miR-4731 may act as a novel biomarker for early diagnosis or therapeutic target of GBM.     

Expression and role of PTV1 lncRNA in glioma cells progression

Objective The aim of this study was to investigate the expression of PTV1 lncRNA in gliomas and the mechanism of its interaction with miR-203a.Methods U87 and U251 cells were cultured stably and transfected with sh-PTV1 or ov-PTV1, respectively. The proliferative activity of U87 and U251 cells was detected and the transplanted tumor model nude mice were divided into U87 and U251 groups. U87-sh and u251-ov cells were injected into the armpit, then miR-203a mic and miR-203a inhibitors were administered to detect the changes in the expression of tumor-related proteins. Results The relative expression of PTV1 in gliomas was significantly higher than that in normal brain tissues, while in GBM it was significantly higher than that in low-grade gliomas. Knockdown of PTV1 significantly inhibited the proliferation of U87 cells, resulting in fewer cell clones; overexpression of rPTV1 significantly promoted the proliferation of U251 cells, resulting in more cell colonies. The dual Luciferase Reporter assay showed that SP2 was a potential target of miR-203a. When U87 cells were treated with a miR-203a mimic, the expression of SP2 decreased; and when U251 cells were treated with a miR-203a inhibitor, the expression of SP2 increased significantly. SP2 was overexpressed in u87-sh cells and the proliferation, migration, and invasion of u87-sh cells were significantly enhanced. U251-ov cells showed the opposite trend. Compared with the control group mice, the tumor volume in u87-sh group mice was significantly smaller and the positive rate of SP2 in tumor tissue was significantly lower. After administration of the miR-203a inhibitor, the tumor volume increased gradually and the positive rate of SP2 increased significantly, while u251-ov mice showed the opposite trend. Conclusion lncRNA PTV1 can be used as a molecule to interfere with miR-203a expression in order to downregulate SP2 and to promote the proliferation and invasion of glioma cells. lncRNA PTV1 may be a new biomarker and therapeutic target for glioma.     

MicroRNA-10a通过调控MMP的表达促进胶质瘤细胞侵袭

目的:研究microRNA-10a( miR-10a)对人脑胶质瘤细胞系U87MG侵袭性的影响.方法:脂质体包被miR-10a反义寡聚核苷酸(miR-10a antisense oligodeoxynucleotide,miR-10a-anti-ODN),转染胶质瘤U87MG细胞,并设无义miRNA转染组和空白对照组,...     

MiR-203 downregulation is responsible for chemoresistance in human glioblastoma by promoting epithelial-mesenchymal transition via SNAI2

Epithelial-mesenchymal transition (EMT) has been recognized as a key element of cell migration, invasion, and drug resistance in several types of cancer. In this study, our aim was to clarify microRNAs (miRNAs)-related mechanisms underlying EMT followed by acquired resistance to chemotherapy in glioblastoma (GBM). We used multiple methods to achieve our goal including microarray analysis, qRT-PCR, western blotting analysis, loss/gain-of-function analysis, luciferase assays, drug sensitivity assays, wound-healing assay and invasion assay. We found that miR-203 expression was significantly lower in imatinib-resistant GBM cells (U251AR, U87AR) that underwent EMT than in their parental cells (U251, U87). Ectopic expression of miR-203 with miRNA mimics effectively reversed EMT in U251AR and U87AR cells, and sensitized them to chemotherapy, whereas inhibition of miR-203 in the sensitive lines with antisense oligonucleotides induced EMT and conferred chemoresistance. SNAI2 was identified as a direct target gene of miR-203. The knockdown of SNAI2 by short hairpin RNA (shRNA) inhibited EMT and drug resistance. In GBM patients, miR-203 expression was inversely related to SNAI2 expression, and those tumors with low expression of miR-203 experienced poorer clinical outcomes. Our findings indicate that re-expression of miR-203 or targeting SNAI2 might serve as potential therapeutic approaches to overcome chemotherapy resistance in GBM.     

地锦草乙醇提取物通过circRHOT1/miR-29a-3p轴抑制结直肠癌SW480细胞的恶性生物学行为

目的：探讨地锦草乙醇提取物（EEEH）对人结直肠癌SW480细胞生物学行为的影响及其分子机制。方法：体外培养SW480细胞,实验分为Con组、EEEH-L组、EEEH-M组、EEEH-H组、si-NC组、si-circRHOT1组、EEEH-H+pcDNA组、EEEH-H+pcDNA-circRHOT1组,分别以si-NC、si-circRHOT1、pcDNA、pcDNA-circRHOT1转染SW480细胞,采用CCK-8法、细胞克隆形成实验、Transwell实验分别检测转染后各组细胞的增殖、迁移及侵袭能力,qPCR法检测转染后各组SW480细胞circRHOT1和miR-29a-3p的表达,WB法检测各组细胞中MMP-2、MMP-9蛋白的表达。双荧光素酶报告基因实验检测circRHOT1与miR-29a-3p之间的靶向关系。结果：与Con组比较,EEEH-L组、EEEH-M组、EEEH-H组SW480细胞中MMP-2和MMP-9蛋白表达均明显降低（均P＜0.05）,circRHOT1的表达均降低（均P＜0.05）而miR-29a-3p的表达均升高（均P＜0.05）且呈剂量依赖性;...     

miR-409-3p靶向调控RRM2抑制鼻咽癌细胞增殖、迁移及侵袭

目的:探究微小RNA-409-3p(miR-409-3p)对鼻咽癌细胞增殖、迁移及侵袭的影响及其作用机制.方法:采用实时荧光定量聚合酶链反应(qRT-PCR)与蛋白免疫印迹法(Western blot)分别检测人永生化鼻咽上皮细胞(NP69)、鼻咽癌细胞5-8F、6-10B中miR-409-3p、核糖核苷酸还原酶M2(...     

miR-218-1-3p对非小细胞肺癌细胞侵袭和迁移影响

目的 非小细胞肺癌(non-small cell lung cancer,NSCLC)因其侵袭性而导致预后不良,miR-218可对多种肿瘤的进展起到抑制作用.本研究探讨miR-218-1-3p对NSCLC A549细胞侵袭和迁移影响.方法 使用LipofectamineTM 2000 Reagent将miR-218-1-3p mimic转染入NSCLC A549细胞中,实时定量聚合酶链反应(real-time PCR,RT-qPCR)检测各组细胞中miR-218-1-3p的表达,Transwell小室法测定其侵袭及迁移能力,荧光定量PCR检测细胞迁移侵袭相关指标基质金属蛋白酶2(matrix metalloproteinase 2,MMP-2)、MMP-7、MMP-9、Rho A、Rho B和Rho C的变化.结果 同对照组相比,上调mir-218-1-3p明显抑制了A549细胞的侵袭(t=4.028,P=0.016)和迁移(t=8.911,P=0.001),其侵袭和迁移的抑制率分别为37.8%和53.6%.MMP-7降低至对照组的(0.68±0.19)倍,t=2.931,P=0.043;MMP-9降低至对照组的(0.58±0.15)倍,t=4.875,P=0.080.结论 miR-218-1-3p能够抑制NSCLC A549细胞的侵袭和迁移.     

沉默lncRNA UCA1通过上调miR-873-5p表达对胶质瘤细胞放射敏感性影响

目的:探讨lncRNA UCA1通过调控miR-873-5p表达对体外培养的胶质瘤SHG-44、U87、U251细胞放射敏感性的影响。方法:采用克隆形成实验检测X线照射0、2、4、6、8 Gy SHG-44、U87、U251细胞存活情况,qRT-PCR检测SHG-44、U87、U251细胞中UCA1基因表达。以放射抵抗...     

VHL基因对U251胶质瘤细胞侵袭和迁移的影响

  目的   研究VHL基因对U251胶质瘤细胞侵袭和迁移能力的影响   方法   使用VHL表达质粒转染胶质瘤细胞,采用RT-PCR检测VHL mRNA表达,Western blot检测VHL、MMP-2、MMP-9蛋白表达,应用Transwell体外侵袭实验、划痕实验检测上调VHL基因后对U251胶质瘤细胞侵袭迁移能力的影响。使用VHL表达质粒处理后的U251细胞建立裸鼠颅内模型,利用免疫组织化学染色法对颅内模型组织切片中VHL、MMP-2、MMP-9蛋白表达进行检测。   结果   VHL表达质粒转染胶质瘤细胞后VHL mRNA、VHL蛋白表达增高,MMP-2、MMP-9蛋白表达下降;并抑制U251胶质瘤细胞侵袭迁移能力。对染色后的组织切片进行分析,VHL表达质粒处理组中VHL的表达较对照组明显升高,MMP-2、MMP-9蛋白较对照组表达减少。   结论   VHL基因能够有效抑制U251胶质瘤细胞侵袭迁移能力,VHL基因可成为治疗胶质瘤的一个有效靶点。      

miR-323a-3p通过靶向结合TM4SF1而调控NSCLC A549细胞的增殖、迁移和侵袭

目的:探究miR-323a-3p、四次穿膜蛋白超家族成员1(TM4SF1)在NSCLC组织和细胞中的表达及两者间的靶向调控关系,观察两者表达对A549细胞增殖、迁移、侵袭和裸鼠移植瘤生长的影响。方法:收集2014年1月至12月间青海省人民医院手术切除的20例NSCLC组织及其相应的癌旁组织,qPCR和WB法检测癌组织中miR-323a-3p、TM4SF1 mRNA和TM4SF1蛋白的表达。向A549细胞转染miR-323a-3p mimic,采用MTT法、Transwell法、WB法检测miR-323a-3p过表达对细胞的增殖、迁移和侵袭以及TM4SF1、细胞周期蛋白D1(cyclin D1)、p21、MMP-2、MMP-9蛋白表达的影响。采用生物信息学预测工具StarBase和双荧光素酶报告基因实验分析miR-323a-3p与TM4SF1靶向关系。将si-TM4SF1转染至A549细胞,以及分别将miR-323a-3p mimic与pcDNA或pcDNA-TM4SF1共转染A549细胞,评估细胞增殖、迁移和侵袭能力的变化;同时建立各组细胞的BALB/c裸鼠移植瘤模型,在14、21和2...     

MiR-124-5p inhibits the growth of high-grade gliomas through posttranscriptional regulation of LAMB1

Background

Glioblastoma multiforme (GBM) is the most aggressive form of human brain tumor. It was previously shown that high levels of laminin-8 expression were a predictor of tumor recurrence and patient survival. It is thus important to elucidate the mechanism by which laminin-8 expression is regulated and determine how this contributes to glioma progression. This study investigated the mechanism of regulation of LAMB1, which encodes the β1 chain of laminin-8, in glioma cells lines and in a mouse model of GBM.

Methods

The expression levels of LAMB1 and miR-124-5p were examined in glioma cell lines (U87 and U251) and GBM tissue samples by quantitative PCR and Western blotting. The potential regulation of LAMB1 by miR-124-5p was investigated by assessing the effects of restored miR-124-5p expression on cell proliferation, colony formation, and tumor growth and angiogenesis. The effects of inhibiting LAMB1 on tumor growth and angiogenesis were also assessed.

Results

The upregulation of LAMB1 expression was highly correlated with the downregulation of miR-124-5p. LAMB1 protein expression was suppressed by miR-124-5p. The restoration of miR-124-5p expression suppressed glioma growth by inhibiting angiogenesis, effects that were also observed upon LAMB1 knockdown.

Conclusions

The findings indicate that miR-124-5p functions as a tumor suppressor and could serve as a molecular marker for glioma diagnosis and as a potential therapeutic target in GBM treatment.