过表达miR-10b促进肺癌细胞系A549增殖

目的探讨非小细胞肺癌(NSCLC)患者肺癌及癌旁组织中miR-10b(miR-10b)表达水平及miR-10b是否通过调控锌指转录蛋白基因(KLF4)对肺癌细胞系A549恶性化的影响。方法 40例NSCLC患者病理切片,原位杂交检测肺癌及癌旁组织中miR-10b的表达量;对肺癌细胞系A549转染miR-10b mimics后,CCK-8法检测肺癌细胞增殖;real-time PCR及Western blot检测KLF4 mRNA及蛋白水平;软琼脂克隆形成实验检测过表达miR-10b对A549细胞的肿瘤恶性化程度的影响。结果肺癌细胞A549及肺癌组织中miR-10b的表达量分别高于正常肺上皮细胞16HBE及癌旁组织;过表达miR-10b模拟物的A549细胞中,KLF4蛋白水平显著下降(P0.05);过表达的miR-10b可显著增加A549细胞的增殖速度及在软琼脂内的成瘤性。结论 miR-10b在不同类型细胞及组织中具有分布差异性、可能是通过抑制KLF4的表达促进肺癌细胞增殖及恶性化。     

miR-221通过下调PTEN促进肺癌A549细胞增殖

目的:探讨微小RNA-221(miR-221)对肺癌A549细胞增殖的影响及其相关作用机制。方法:通过脂质体转染试剂Lipofectamine 2000把miR-221 mimics转染入肺癌细胞A549内,RT-q PCR检测miR-221和PTEN mRNA的表达;Western blot检测PTEN蛋白表达;CCK-8及平板克隆形成实验检测细胞增殖能力。构建含PTEN 3'-UTR的萤光素酶报告载体,检验miR-221对PTEN的靶向调控作用。结果:转染miR-221后肺癌细胞中miR-221表达水平明显高于对照组及空白组(P0.01),PTEN mRNA及蛋白表达均显著下降(P0.05);细胞增殖及集落形成能力明显增强(P0.05);miR-221能抑制PTEN的萤光素酶活性。结论:miR-221能够抑制肺癌A549细胞中PTEN的表达,并促进细胞增殖。     

The effect and mechanism of miR-210 in down-regulating the autophagy of lung cancer cells

This project aims to investigate the roles of miR-210 in autophagy of lung cancer cells and the related mechanism. The expressions of miR-210 and ATG7 in 30 cancer tissues and the adjacent tissues in patients with lung cancer were compared using RT-qPCR methods, Western Blot assay was carried out to test the expression of ATG7 in protein. Moreover, the dual luciferase reporter gene assay system was used to confirm ATG7 is a target gene of miR-210. Furthermore, lung cancer cell line A549 was transfected with either miR-210 mimics or inhibitors and RT-qPCR methods was used to detect the expression of miR-210 and ATG7. Next, MTT assay was used to examine the effect of miR-210 on the growth of the lung cancer cells, and finally, the expression of autophagy related genes, ATG7, LC3-II/LC3-I and Beclin-1 were detected by Western Blot and ICC assay. We observed that miR-210 was significantly increased and ATG7 was markedly decreased in cancer tissue of patients with lung cancer compared with normal tissue. Moreover, results of dual luciferase reporter assay indicated that ATG7 is a direct target of miR-210. Next, transfection of miR-210 mimics in lung cancer cells induced significant increase in cell proliferation, and transfection of miR-210 inhibitors lead to inhibited cell proliferation. Furthermore, over-expression of miR-210 induced marked decrease in the expression of ATG7, LC3-II/LC3-I and Beclin-1, while transfection of miR-210 inhibitors induced significant increase in the expression of ATG7, LC3-II/LC3-I and beclin-1. Our results suggested that miR-210 plays a great role in autophagy of lung cancer cell by targeting ATG7.     

LncRNA HEIH通过miR-98-5p调节肺癌细胞增殖和凋亡

目的探讨lncRNA HEIH对肺癌细胞增殖和凋亡的影响及其作用机制。方法培养人正常肺上皮细胞BEAS-2B和肺癌细胞系A549、A427、H1299和TKB-1,RT-qPCR检测细胞中HEIH表达水平;分别转染si-HEIH和miR-98-5p mimics至A549细胞,沉默A549细胞中HEIH表达或过表达miR-98-5p;MTT法检测细胞增殖;流式细胞仪检测细胞凋亡;Western blot检测CCND1、caspase-3、SHH、GLI-1、PTCH和SUFU蛋白表达。双荧光素酶报告基因实验验证HEIH与miR-98-5p之间的关系。结果与正常肺上皮细胞BEAS-2B相比,肺癌细胞系A549、A427、H1299和TKB-1中HEIH表达水平显著升高(P<0.05).其中A549细胞中的HEIH表达最高。因此,后续实验选择A549细胞为研究对象。沉默HEIH表达或过表达miR-98-5p均可降低A549细胞培养12、48和72 h后吸光度值(A值)(P<0.05)(MTT法);升高凋亡率(P<0.05);抑制CCND1蛋白表达(P<0.05),促进caspase-3蛋白表达(P<0.05)。并且过表达miR-98-5p还抑制了A549细胞中SHH和GLI-1的mRNA和蛋白表达(P<0.05),促进了PTCH和SUFU的mRNA和蛋白表达水平(P<0.05)。过表达HEIH逆转了过表达miR-98-5p对A549细胞增殖、凋亡以及SHH、GLI-1、PTCH和SUFU的mRNA和蛋白表达的影响。结论沉默HEIH表达可能通过靶向miR-98-5p经Hedgehog信号通路抑制肺癌细胞的增殖,并促进其凋亡。     

miR-210 调控Mex3B 蛋白对肺癌细胞侵袭和增殖的影响

目的:探讨miR-210 和Mex3B 蛋白对肺癌细胞侵袭和增殖能力的影响。方法:运用qPCR 检测miR-210 在正常肺组织和癌旁组织中的表达情况;运用qPCR 检测Mex3B 在肺癌组织、癌旁组织中的表达;qPCR 检测miR-210 在不同肺癌细胞株中(A549、H1299、H1650 和H358)的表达水平;双荧光素酶报告基因系统检测miR-210 对Mex3B 转录的影响;细胞活性实验检测miR-210 的表达对肺癌细胞活性的影响;平板克隆实验检测miR-210 的表达对肺癌细胞A549 的增殖能力的影响;Transwell 侵袭实验检测miR-210 的表达对肺癌细胞株A549 的侵袭能力的影响。结果:和癌旁组织比较,miR-210 在肺癌组织中表达明显增高,和癌旁组织比较,Mex3B 在肺癌中表达较低,双荧光素酶报告基因系统检测结果显示,miR-210 可以直接调控Mex3B 的转录活性,抑制miR-210 的表达活性后,A549 肺癌细胞的细胞活性受到一定的抑制;抑制miR-210 后,肺癌细胞株A549 的侵袭和增殖能力明显降低。结论:miR-210 可以靶向调控肺癌细胞的侵袭和增殖能力。     

miR-130b-3p有望作为人膀胱癌的标志物

目的进一步了解miRNA在膀胱癌中的潜在机制。方法芯片分析4对人膀胱癌组织和相邻正常组织中的miRNA的表达。并用RT-q PCR来验证两个最上调的miRNA及其靶基因的表达是否符合miRNA/mRNA芯片结果。通过相关性分析和双荧光素酶报告实验推断并验证miR-130b-3p可以靶向PTEN。应用CCK8、EDU、流式细胞术、划痕、Transwell和细胞骨架等实验证明miR-130b可以影响膀胱癌细胞的增殖、凋亡、迁移和侵袭。用Western blot检测PI3K/AKT和整合素β1/FAK信号通路的关键靶蛋白。结果人膀胱癌中miR-130b-3p表达高于癌旁且与PTEN表达呈负相关。miR-130b-3p可下调PTEN表达,导致PI3K/AKT和整合素β1/FAK信号通路的激活,且与膀胱癌EJ细胞的增殖、迁移和侵袭相关。细胞转染miR-130b-3p抑制剂时,可以重排细胞骨架。结论本结果揭示miR-130b/PTEN有望用于人膀胱癌诊断和治疗的标志物。     

miR-206及Bcl-2蛋白在非小细胞肺癌中的表达及意义

目的探讨mi R-206及Bcl-2蛋白在非小细胞肺癌(NSCLC)的表达,以及抑制或过表达mi R-206对Bcl-2蛋白表达的影响。方法实时定量PCR方法检测NSCLC组织mi R-206的表达水平,Western blot方法检测NSCLC组织Bcl-2蛋白表达;将mi R-206 inhibitors及mi R-206 mimics转染至A549细胞,通过CCK-8法测定A549细胞增殖能力的变化,Western blot方法检测转染后Bcl-2蛋白表达变化。结果 mi R-206在非小细胞肺癌组织中的表达量较癌旁组织明显降低(0.01),Bcl-2蛋白在癌组织中较癌旁组织表达明显增高(0.05);转染mi R-206 inhibitor的细胞增殖能力与对照组相比显著升高,细胞内Bcl-2蛋白水平亦明显升高(0.05),转染mi R-206 mimics的细胞增殖能力与对照组相比显著降低,细胞内Bcl-2蛋白水平亦明显降低(0.05)。结论mi R-206在NSCLC组织中低表达,mi R-206抑制能够促进A549细胞增殖和Bcl-2蛋白表达。     

miR-107 靶向NID2 通过Notch 信号通路调控肺癌细胞的增殖侵袭

目的:miR-107 靶向NID2 调控Notch 信号通路影响肺癌的侵袭和增殖。方法:免疫组化检测NID2 在肺癌组织和正常肺组织中的表达;PCR 检测miR-107 在肺癌组织中的表达;双荧光素酶报告基因系统检测miR-107 对NID2 转录活性的影响;肿瘤细胞成球实验检测miR-107 的表达对肺癌细胞A549 的增殖能力的影响;Transwell 侵袭实验检测miR-107 的表达对肺癌A549 细胞的侵袭能力的影响;划痕试验检测miR-107 的表达对肺癌A549 细胞的迁移能力的影响;Western blot 检测过表达miR-107 后Notch 信号通路的蛋白表达水平。结果:和正常肺组织比较,NID2 在肺癌组织中表达较高;miR-107 在肺癌组织中表达明显降低;双荧光素酶报告基因系统检测结果显示,miR-107 可以直接调控NID2 的转录活性;过表达miR-107 后,肺癌细胞A549 的增殖、侵袭和迁移能力明显降低;过表达miR-107 后,Notch1、hes-1、presenilin1 蛋白表达下调。结论:miR-107靶向NID2 的表达,通过Notch 通路调控肺癌细胞的增殖和侵袭能力。     

LncRNA UNC5B-AS1靶向miR-339-5p调控人肺腺癌细胞系A549增殖和凋亡

目的 旨在研究lncRNA UNC5B-AS1靶向miR-339-5p对肺癌细胞增殖和凋亡的影响及分子机制.方法 体外培养人肺腺癌细胞系A549;将si-NC、si-UNC5B-AS1、miR-NC、miR-339-5p mimics、si-UNC5B-AS1与anti-miR-NC、si-UNC5B-AS1与anti...     

miR-454-3p靶向BPTF表达调控肺癌细胞A549增殖、迁移和侵袭

目的探讨miR-454-3p对肺癌细胞增殖、迁移和侵袭的影响及分子机制。方法采用RT-PCR技术检测miR-454-3p在肺癌组织以及肺癌细胞株中的表达,以表达量最低的肺癌细胞A549为后续分析对象,将miR-454-3p mimic转入A549细胞,RT-PCR验证miR-454-3p的过表达效率;采用CCK-8、迁移、侵袭等实验,观察转染组与对照组肺癌细胞的增殖、迁移和侵袭情况;生物信息学预测BPTF是miR-454-3p的靶标,构建BPTF 3′UTR荧光素酶载体,通过双荧光素酶报告基因验证miR-454-3p和BPTF的靶向关系;应用Western blot法检测BPTF的表达及迁移、侵袭相关蛋白的变化。结果RT-PCR实验表明miR-454-3p在肺癌组织和细胞中表达下调,且在A549细胞中表达最低(P<0.05)。与对照组相比,过表达miR-454-3p的肺癌细胞A549增殖能力明显降低,迁移和侵袭能力均受到抑制(P<0.05)。生物信息学软件分析BPTF为miR-454-3p的潜在靶基因,过表达miR-454-3p后BPTF的表达水平明显受到抑制。同时,迁移相关蛋白MMP-2和MMP-9表达明显下调,E-cadhern表达明显上调,而E-cadherin的负性调控N-cadherin表达下降。结论miR-454-3p可能通过靶向下调BPTF的表达,抑制肺癌细胞的增殖、迁移和侵袭能力,为肺癌的靶向治疗提供潜在靶标。     

miR-106a promotes growth and metastasis of non-small cell lung cancer by targeting PTEN

MicroRNAs are a class of small non-coding RNAs that play essential roles in cancer development and progression. Recent studies suggested that abnormal expression of miRNAs occurs frequently in non-small cell lung cancer (NSCLC) tissues compared to adjacent normal tissues. In this study, we investigated the expression and the biological roles of miR-106a in non-small cell lung cancer. Our results showed that miR-106a was up-regulated in NSCLC tissues and cell lines. Inhibition of miR-106a in NSCLC cells substantially inhibited cell proliferation, migration, and invasion. Phosphatase and tensin homolog (PTEN) was identified as a direct target of miR-106a, and over-expression of miR-106a suppressed PTEN by direct binding to its 3’-untranslated region (3’-UTR). Furthermore, the presence of miR-106a was inversely correlated with PTEN in NSCLC tissues. Overall, this study suggested that miR-106a inhibited the growth and metastasis of NSCLC cells by decreasing PTEN expression. These data provide novel insights with potential therapeutic applications for the treatment of NSCLC.     

miR-218 modulate hepatocellular carcinoma cell proliferation through PTEN/AKT/PI3K pathway and HoxA10

Purpose: To investigate the regulatory mechanism of miR-218 in human hepatocellular carcinoma (HCC). Methods: qPCR was used to compare the expression levels miR-218 among six hepatocellular carcinoma cell lines and normal liver tissues. After transfecting MHCC97L cells with either miR-218 mimics or miR-218 inhibitor, western blotting was used to examine the expressing patterns of cyclinD1, p21, and PTEN/AKT/PI3K signaling pathway-related proteins. MTT and colony forming assay was used to assess the capability of cell proliferation. Bioinformatic method was applied to predict the binding of miR-218 on HoxA10, and western blotting was used to examine the modulatory effect of miR-218 AND HoxA10 on PTEN/AKT/PI3K pathway in HCC. Results: The expression levels of miR-218 were frequently lower in HCC cell lines than in normal liver tissues. Over-expression of miR-218 in HCC cells significantly decreased cell proliferation whereas inhibiting miR-218 promoted cancer cell proliferation. Western blotting analysis demonstrated that tumorigenesis related protein cyclin D1 and p21, as well as PTEN/AKT/PI3K signaling pathways were actively modulated by miR-218 in HCC cells. The expression of endogenous HoxA10 was also down-regulated by miR-218 over-expression, and silencing HoxA10 directly activated PTEN in HCC cells. Conclusion: Modulation of miR-218 actively affected HCC cancer cell development. The regulatory mechanism of miR-218 in HCC cells was acting through PTEN/AKT/PI3K pathway and possibly associated with HoxA10.     

microRNA-182 inhibits the proliferation and invasion of human lung adenocarcinoma cells through its effect on human cortical actin-associated protein

Lung cancer is one of the main causes of cancer death worldwide. The cortactin gene, CTTN, may play a pivotal role in the proliferation and invasion of tumors. A microRNA (miR-182) was cloned and used to study the expression of CTTN and its regulatory effects on the proliferation and invasion of the lung cancer cell line, A549. Cortactin protein and CTTN mRNA expression decreased in A549 cells that were transfected with the miR-182 expression plasmid. A cell proliferation assay indicated that miR-182 expression affected cell cycle regulation and suppressed proliferation of lung cancer cells in vitro. In addition, xenograft experiments confirmed the suppression of tumor growth in vivo, which was due to the promotion of apoptosis. In conclusion, endogenous mature miR-182 expression may have an important role in the pathogenesis of lung cancer through its interference with the target gene CTTN by epigenetic modification.     

miR-134调控人肺腺癌细胞顺铂耐药

目的:探讨微小RNA-134(miR-134)在人肺腺癌细胞顺铂耐药中的作用及机制。方法:采用miRNA芯片筛选A549/CDDP和A549细胞差异表达miRNA,应用real-time PCR验证miR-134的表达。将miR-134模拟物和抑制物分别转染A549/CDDP和A549细胞,应用MTT法检测肺癌细胞对顺铂的敏感性。Western blot技术检测miR-134对叉头框蛋白M1(FOXM1)和多药耐药相关蛋白1(MRP1)表达的影响。结果:miRNA芯片显示,13种miRNAs在A549/CDDP和A549细胞中呈显著表达;其中,miR-134下调最显著。miR-134模拟物转染组A549/CDDP细胞对顺铂的敏感性较阴性对照组显著提高(P0.01),而miR-134抑制物转染组A549细胞对顺铂的敏感性较阴性对照组显著降低(P0.01)。FOXM1 siRNA能够有效抑制FOXM1蛋白表达,si-FOXM1转染组A549/CDDP细胞对顺铂的敏感性较阴性对照组显著提高(P0.01)。此外,Western blot结果显示miR-134能够抑制MRP1蛋白表达。结论:miR-134能够增加肺腺癌细胞对顺铂的敏感性,其机制可能与调控FOXM1和MRP1表达有关。     

MicroRNA-539靶向调控E2F转录因子3抑制肝癌的发生与发展

目的 探讨肝癌组织中microRNA-539（miR-539）表达水平及其抑制肝癌细胞增殖的作用机制。方法 收集90例肝癌患者术后肝癌组织及癌旁组织标本,用实时定量聚合酶链反应（Real-time PCR）检测组织中miR-539表达量。在PCL/PRF5、Huh7和QGY-7701肝癌细胞中转染miR-539 模拟物（mimics）,用Real-time PCR检测miR-539表达量。用MTT法检测miR-539对肝癌细胞增殖的影响;用流式细胞仪检测miR-539对肝癌细胞凋亡的影响;用免疫印迹法检测miR-539对肝癌细胞中E2F转录因子3（E2F3）蛋白表达的影响。结果 肝癌组织中miR-539表达量显著低于癌旁组织（P<0.05）;miR-539表达量与肝癌患者性别、年龄及肝癌组织分化程度无关（P>0.05）;与肿瘤直径和淋巴结转移相关（P<0.05）。转染miR-539 mimics组肝癌细胞中miR-539表达量显著高于空白组和miR-539 NC组（P<0.05）。在QGY-7701细胞中,过表达miR-539能显著抑制细胞增殖（P<0.05）,降低E2F3蛋白的表达（P<0.05）,对细胞凋亡无明显作用（P>0.05）。结论 miR-539是肝癌发生中的抑癌因子,可能是通过靶向下调E2F3蛋白水平达到抑制癌细胞的增殖。     

长链非编码MALAT-1 调控miR-205 的表达影响非小细胞肺癌细胞的生长和迁移

目的:探讨在非小细胞肺癌中,LncRNA MALAT-1 与miR-205 的相互关系,以及影响肺癌细胞生物学行为的机制。方法:qPCR 检测不同非小细胞肺癌中LncRNA MALAT-1 的表达情况;双荧光素酶报告基因检测MALAT-1 与miR-205的相互作用;Transwell 侵袭实验和划痕实验检测抑制MALAT-1 后肺癌细胞侵袭能力的变化,以及抑制miR-205 的表达后肺癌细胞迁移和侵袭能力的恢复情况;裸鼠皮下成瘤检测抑制LncRNA MALAT-1 后肺癌细胞体外成瘤体积和质量变化。结果:与其他肺癌细胞株相比,A549 细胞中MALAT-1 表达最高,miR-205 的表达水平最低;双荧光素酶实验证实MALAT-1 能与miR-205 的3忆UTR 特异性结合,可以调控miR-205 的表达与活性;抑制MALAT-1 的表达后可以降低肺癌细胞的迁移和侵袭能力;抑制miR-205 的表达水平过后,肺癌细胞的迁移和侵袭能力相对增强;抑制MALAT-1 的表达后,荷瘤小鼠的肿瘤体积和重量都明显减小。结论:MALAT-1 可以调控miR-205 的表达影响肺癌细胞A549 的侵袭和迁移能力。     

MicroRNA-570 promotes lung carcinoma proliferation through targeting tumor suppressor KLF9

Increasing studies have shown that MicroRNAs (miRNAs) play critical roles in the progression of lung carcinoma. In the present study, the expression and functions of miR-570 were investigated. We found that miR-570 was significantly up-regulated in lung cancer tissues, compared with adjacent non-cancerous tissues. In vitro studies further showed that miR-570 mimics could promote, while its antisense oligos inhibit cell proliferation and invasion. At the molecular level, krüppel-like factor 9 (KLF9), a tumor suppressor gene, was identified as a potential target of miR-570 in lung cancer cells. Indeed, miR-570 could negatively regulate protein levels of KLF9 through targeting its 3’-untranslated region. Taken together, our results suggest a previously unknown miR-570/KLF9 molecular network controlling lung carcinoma progression.     

BAG2基因影响A549细胞增殖的机制研究及其临床意义

目的:研究Bcl-2相关抗凋亡基因2(Bcl-2-associated athanogene,BAG2)对人肺腺癌A549细胞增殖能力的影响及作用机制,并探讨其临床意义。方法:以Western blot法分析BAG2在A549细胞与正常上皮细胞系HBE中的蛋白表达水平;在体外以RNA干扰(RNAi)技术敲低A549细胞中BAG2基因的表达,并采用CFSE染色结合流式细胞术、WST-1法和Western blot法对A549细胞增殖和细胞周期相关蛋白进行评价。此外,我们利用q PCR检测BAG2在肺癌组织c DNA芯片中的表达情况,同时分析了GEO数据库中BAG2表达与肺癌患者预后之间的关系。结果:与HBE细胞比较,A549细胞中BAG2的表达显著升高(P0.05);干扰BAG2基因后,A549细胞在48 h和72 h时点时增殖均被抑制;在48 h时点,干扰BAG2可导致细胞周期蛋白cyclin B1与cyclin E1表达显著下调(P0.05)。在人肺癌组织中,BAG2基因表达显著高于癌旁组织,并与肺癌患者生存预后呈显著负相关(P0.01)。结论:BAG2基因可能通过上调细胞周期蛋白cyclin B1与cyclin E1影响A549细胞的增殖,其表达量与肺癌患者预后呈显著负相关。