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miRNA-214通过靶向β-catenin通路抑制肝癌生长
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摘要
肝细胞癌(Hepatocellular carcinoma,HCC)是人类最常见的恶性肿瘤之一。尽管在肝癌的治疗中取得了很大进步,肝癌仍是癌症相关死亡的第三大原因,患者的5年生存率不到5%。调查肝癌发生发展的分子机制,对于开发新的诊断、治疗和预后方法具有重要意义。MicroRNA(miRNA)是一类丰富的非编码的短RNA,在转录后水平通过诱导mRNA的降解或抑制其翻译从而抑制靶基因的表达。最近,越来越多的报告表明,异常表达的miRNA与各种人类癌症,包括肝癌有关,miRNA可以作为肿瘤抑制基因或癌基因参与人类癌症的发生发展。这对肝癌的诊断和治疗应用提供了新的途径。最近的miRNA表达谱研究已经证明了miR-124在肝癌表达下调,然而,其在肝癌发生过程中的潜在的功能及相关机制仍未明确。本实验从肝癌组织标本和细胞系中检测miR-124的表达,然后构建miR-124过表达慢病毒载体在体内外研究其对肝癌生长的抑制作用,并进一步探讨其机制。
     研究方法
     本课题首先应用实时定量RT-PCR方法检测18对配对的肝癌组织和癌旁组织以及肝癌细胞株和正常肝细胞系LO2中成熟miR-214的表达情况。然后构建miR-214的慢病毒载体,包装慢病毒,并感染HepG2细胞,筛选慢病毒稳定株。检测稳定过表达miR-214对肝癌细胞的生长、增殖、克隆形成能力以及细胞周期的影响;并进行裸鼠成瘤实验,观察miR-214对HepG2细胞成瘤能力的影响。应用生物信息学软件预测miR-214可能作用的靶基因,并采用荧光素酶报告实验、实时定量RT-PCR、Western blot进行靶基因验证。通过β-catenin RNA干扰和恢复表达实验,检测对细胞增殖的影响。检测miR-214对β-catenin通路下游蛋白CyclinD1、c-Myc、TCF-1和LEF-1的表达水平的影响。
     研究结果
     1.miR-214在肝癌组织和肝癌细胞系Hep3B,SK-HEP1,SMMC-7721,Huh7,HepG2细胞中的表达显著下调。
     2.建立了表达miR-214的HepG2细胞稳定株。
     3.细胞生长曲线表明miR-214HepG2细胞生长缓慢;MTT实验表明miR-214过表达可抑制HepG2细胞的增殖;miR-214稳定株的HepG2细胞集落生长能力降低;细胞周期检测发现miR-214组HepG2细胞在G1/G0比例为69.28%,高于对照组的54.62%;miR-214组HepG2细胞S期细胞的比例为19.56%,明显较对照组比例33.48%低,结果提示miR-214可通过引起细胞G1期阻滞抑制肝癌细胞增殖。
     4.用miR-214稳定株HepG2细胞和对照慢病毒细胞,建立裸鼠肝癌移植瘤模型,结果发现,miR-214组肿瘤生长明显慢于对照组;皮下接种BALB/c裸鼠25d后,miR-214组肿瘤体积为对照组的32%,重量为对照组的37.5%。
     5.TargetScan等软件预测CTNNB1可能是miR-214作用的靶基因。荧光素酶报告实验结果表明,转染miR-214表达质粒能够抑制共转染的CTNNB1-3’-UTR载体荧光素酶基因活性,而共转染miR-214表达质粒和CTNNB1-3’-UTR靶位点突变载体,荧光素酶活性未见明显改变。Western blot检测发现miR-214可抑制β-catenin蛋白的表达;实时定量RT-PCR结果显示转染miR-214表达质粒后,β-catenin mRNA的表达量和对照组相比无显著差异。
     6.转染shβ-catenin干扰质粒可降低β-catenin表达,抑制HepG2细胞增殖。对稳定表达miR-214的肝癌细胞,转染不含3'-UTR的β-catenin过表达质粒,可恢复β-catenin蛋白表达,逆转miR-214对HepG2细胞增殖的抑制作用。
     7.Western blot结果显示miR-214稳定表达株中CyclinD1、c-Myc和TCF-1的表达水平下降,miR-214稳定表达株裸鼠移植肿瘤组织中CyclinD1、c-Myc和LEF-1的表达水平比对照组下降。
     研究结论
     1.miR-214在肝癌组织和肝癌细胞系中的表达显著下调。
     2. miR-214可以在体外和在体内抑制肝癌细胞的生长。
     3.CTNNB1是miR-214的靶基因。miR-214可以通过抑制β-catenin通路影响肝癌生长。
Hepatocellular carcinoma (HCC) is one of the most common malignant tumorworldwide. Despite of great progress in the treatment of HCC, it remains the thirdleading cause of cancer-related death, and the5-year survival of HCC patients is lessthan5%. Therefore, it’s very necessary to clarify the molecular mechanisms of HCCfor development of new diagnostic, treatment and prognosis strategy. MicroRNAs(miRNAs) is a class of rich non-coding short RNA inhibiting the expression oftarget genes in post-transcriptional level by inducing mRNA degradation or inhibit itstranslation. Recently, a growing number of reports indicate that abnormal expressionof miRNAs associated with a variety of human cancers, including HCC, and miRNAas a tumor suppressor or oncogene involved in the development of human cancers.This provides a new approach to the diagnosis and treatment of HCC. MicroRNAprofile in recent studies have demonstrated that miR-124is downregulated in HCC,however, its potential function in the process of HCC and related mechanisms are notyet clear.
     Methods
     We detected the expression lever of mature miR-214in18paired HCC tissue andadjacent tissues,and HCC cell lines including Hep3B,SK-HEP1, SMMC-7721, Huh7,HepG2cells and normal liver cells LO2by quantitative real-time RT-PCR analysis.
     Lentiviral expression plasmid of miR-214(Lv-miR-214) or lentiviral control(Lv-control) and packaging systems co-transfected293T cells to produce lentivirus,then infected HepG2cells, and screened cell strains stably expressing miR-214. Cellgrowth curve and MTT assay were employed for HepG2cell proliferation assay;Colony formation assay for single tumor cell colony growth capacity assay; Flowcytometry for cell cycle analysis assay. Nude mice experiments was employed toobserve the impact of the tumorigenic ability of miR-214on HepG2cells.
     Bioinformatics softwares were applicated to predict the possible target genes of miR-214, and luciferase reporter experiments, quantitative real-time RT-PCR, Westernblot for target gene validation. β-catenin RNA interference and restore expressionexperiments was employed for testing the effects of β-catenin on cell proliferation.Impact of miR-214on the expression levels of β-catenin pathway downstream proteinof CyclinD1, c-Myc,TCF-1, and LEF-1was detected by Western blot.
     Results
     1. miR-214is significantly downregulated in HCC tissues and HCC cell lines.
     2. HepG2cell strains stably expressing miR-214were established.
     3. Cell growth curves showed that HepG2cell strains stably expressing miR-214growed slowly; MTT experiments showed that miR-214overexpression inhibitsHCC cell proliferation; Colony formation experiments showed that overexpression ofmiR-214reduced tumor cell colony growth ability; The flow cytometry discoveredthe proportion of cells in G1/G0phase were54.62%in the control group, while theratio in G1/G0increased to69.28%in the experimental group; the proportion of cellsin S phase was19.56%, lower than the control group, the proportion was33.48%.This suggest that miR-214caused cell cycle G1arrest.
     4. HepG2cell strains stably expressing miR-214were applicatied to establish nudemice HCC animal model, compared to the control group, the experimental grouptumors grow slowly; The volume and wight of the tumors in the experimental groupwere32%and37.5%of the control group25d after inoculated subcutaneously withBALB/c nude mice.
     5.TargetScan predicted CTNNB1may be a target genes of miR-214. Luciferasereporter experimental results show that luciferase gene activity can be suppressed byco-transfection of miR-214expression plasmid and CTNNB1-3'-UTR, but not byco-transfection of miR-214expression plasmid and CTNNB1-3'-UTR-mt. Westernblot analysis showed that miR-214can inhibit the expression of β-catenin protein;qRT-PCR results showed that miR-214didn’t influrenced β-catenin mRNA expression.
     6.The shβ-catenin reduceed β-catenin expression, inhibited HCC cell proliferation.Transfection of β-catenin overexpression plasmid not containing the3'-UTR ofCTNNB1restored β-catenin protein expression, reversed the inhibition of miR-214on cell proliferation.
     7.Western blot showed that CyclinD1, c-Myc,LEF-1, and TCF-1expression levelsdecreased in HepG2cell strains stably expressing miR-214and nude micetransplanted tumor tissue.
     Conclusions
     1.miR-214is significantly downregulated in HCC tissues and HCC cell lines.
     2.miR-214inhibition of the growth of HCC cells in vitro and in vivo.
     3. CTNNB1is a target gene of miR-214. miR-214can affect HCC cells growth by theβ-catenin pathway.
引文
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