miR-218-5p靶向N-cadherin调节胃癌细胞迁移、侵袭分析

摘 要：［目的］ 研究miR-218-5p靶向N-钙黏蛋白（N-cadherin）调节胃癌细胞迁移、侵袭的作用及机制。［方法］ 收集28例胃癌组织及癌旁组织,检测miR-218-5p及N-cadherin的表达水平;培养MNK45胃癌细胞,分为转染阴性对照（NC）mimic的NC组和转染miR-218-5p mimic的miR-218-5p组,检测细胞的迁移及侵袭数目、N-cadherin的mRNA及蛋白表达水平、N-cadherin双荧光素酶报告基因的荧光活力。［结果］胃癌组织中miR-218-5p的表达水平（0.45±0.09）显著低于癌旁组织的（0.71±0.22）（P<0.05）,N-cadherin的表达水平（0.93±0.20）显著高于癌旁组织的（0.67±0.14）（P<0.05）,且miR-218-5p的表达水平与N-cadherin的表达水平呈负相关（r=-0.201,P<0.05）。miR-218-5p组MNK45胃癌细胞的迁移数目（65.57±11.49）及侵袭数目（67.11±10.34）均少于NC组（113.84±20.13,98.72±18.57;P均<0.05）,N-cadherin的mRNA及蛋白表达水平、野生型N-cadherin双荧光素酶报告基因的荧光活力低于NC组（P<0.05）。［结论］ miR-218-5p在胃癌中低表达,过表达miR-218-5p能够抑制胃癌细胞的迁移和侵袭,靶向抑制N-cadherin是可能的分子机制。     

奥沙利铂通过调控miRNA-7-5p/RAF-1促进胃癌SGC-7901细胞凋亡的研究

目的探讨奥沙利铂如何调控MAPK通路,抑制胃癌细胞的增殖。方法 NCBI检索文献,利用TargetScan、StarBase和miRBase数据库,进行GO分析与KEGG通路富集,找到相关miRNAs,预测靶基因。应用Real-time PCR、MTT、Hoechst33258、流式细胞术、细胞划痕实验、Western blot等方法分析人胃癌SGC-7901细胞的增殖、细胞周期、侵袭及蛋白表达情况。结果胃癌细胞中miR-7-5p显著低表达,RAF1与miR-7-5p存在互靶关系。miR-7-5p mimics与奥沙利铂均可促进SGC-7901细胞的凋亡,提高G1期细胞百分率(P<0.05),降低侵袭、迁移速度。caspase3、caspase9蛋白表达升高,Bcl-2/Bax比值降低(P<0.05)。结论过表达mi R-7-5p与奥沙利铂均可促进胃癌SGC-7901细胞的凋亡,提示奥沙利铂可能通过上调mi RNA-7-5p促进SGC-7901细胞的凋亡,降低侵袭、迁移速度。     

MiR-129-5p靶向HMGB1抑制骨肉瘤细胞增殖和迁移

目的 探讨miR-129-5p对骨肉瘤(OS)细胞增殖和迁移的影响以及对HMGB1的调控作用.方法 RT-PCR和Western blot法分别检测骨肉瘤细胞株MG-63、Saos-2和成骨细胞hFOB1.19中miR-129-5p和HMGB1的表达.生物信息学预测miR-129-5p与HMGB1基因是否存在结合位点,...     

miR-218-5p靶向TPX2调节p53通路影响肺腺癌恶性进展

背景与目的肺腺癌(lung adenocarcinoma,LUAD)是肺癌的一种主要亚型,其治疗与诊断依然是目前的研究热点。靶向Xklp2靶蛋白(targeting protein for Xenopus kinesin-like protein2,TPX2)在多种癌细胞中高表达,可能与LUAD的发生发展相关。本研究旨在探究TPX2对LUAD细胞恶性进程的影响以及调控机制。方法通过生物信息学分析技术,对癌症基因组图谱(The Cancer Genome Atlas,TCGA)数据库中LUAD组织中基因TPX2的表达情况进行分析。实时荧光定量聚合酶链式反应(quantitative real-time polymerase chain reaction,qRT-PCR)检测人肺正常细胞系和人LUAD细胞系中TPX2和miR-21 8-5p的表达水平。蛋白质印迹法(Western blot)检测细胞系中TPX2蛋白表达以及其对p53信号通路关键蛋白表达的影响。使用生物信息学预测并通过双荧光素酶报告基因检测验证TPX2与miR-218-5p的关系,细胞活力检测(cell counting k...     

miR-218-5p靶向LASP1对结直肠癌细胞侵袭和迁移影响的机制

目的 探讨miR-218-5 p对结直肠癌(CRC)细胞侵袭、迁移能力的影响及分子机制.方法 利用生物信息学软件TargetScan、Pictar、miRanda及miRWalk预测miR-218-5p靶基因,采用双荧光素酶实验检测miR-218-5p与预测基因LASP1(LIM and SH3 protein 1)的...     

MiR-218通过抑制Robo1的表达影响肺癌细胞迁移侵袭

背景与目的 本研究旨在探讨肺癌中miR-218的表达,研究miR-218在肺癌细胞中的功能及其可能的分子机制.方法 应用实时荧光定量PCR(qRT-PCR)检测15例肺癌组织和15例癌旁组织中miR-218的表达.在肺癌细胞A549中转染miR-218的抑制物(Anti-miR-218),在肺癌细胞HCC4006中转染miR-218的模拟物后,用Transwell实验检测细胞的迁移侵袭能力的变化.用Targetscan和MiRanda软件预测miR-218的可能靶点,转染miR-218的抑制物及模拟物后用qRT-PCR和Western blot检测Robo1的mRNA和蛋白表达水平.用双荧光素酶报告基因方法鉴定miR-218和Robo1的调控关系.用Anti-miR-218、miR-218模拟物或阴性对照与Si-Robo1或Si-NC同时转染细胞,应用Transwell实验检测转染后细胞的侵袭迁移能力的变化.结果 与癌旁组织比较,肺癌组织中miR-218在肺癌组织中表达水平显著降低(P<0.01).在A549细胞中转染miR-218的抑制物,能够显著降低miR-218的表达,促进了细胞的迁移侵袭.在HCC4006中转染miR-218的模拟物能够显著提高miR-218的表达,同时抑制了细胞的迁移侵袭能力.利用生物信息学预测出在Robo1的3′UTR区有miR-218的结合位点,双荧光素酶报告基因实验进一步证实miR-218能够调控Robo1的转录活性.抑制miR-218能够提高Robo1的表达;过表达miR-218显著降低Robo1的表达,且miR-218能够通过调控Robo1影响细胞的迁移侵袭.结论 MiR-218在肺癌组织中呈现低表达状态,miR-218可能是通过抑制Robo1的表达抑制肺癌细胞侵袭迁移.     

miR-122-5p通过靶向CREB1抑制食管癌细胞及移植瘤的生长

背景与目的:miR-122在多种肿瘤中表达异常,参与肿瘤细胞增殖、凋亡等,而cAMP反应元件结合蛋白1(cAMP response element-binding protein 1,CREB1)参与食管癌发展过程,研究miR-122-5p通过靶向CREB1对食管癌细胞及移植瘤生长的作用及机制.方法:选取2017年11...     

miR-299-5p通过靶向SOX4调控胃癌细胞的增殖与凋亡

目的:探讨miR-299-5p对胃癌细胞增殖与凋亡的作用及相关机制。方法:采用RT-qPCR法检测胃癌细胞（SGC-7901、BGC-823）及正常胃黏膜上皮细胞（RGM-1）中miR-299-5p的表达差异。利用生物信息学方法预测miR-299-5p的靶基因,并使用荧光素酶报告实验验证miR-299-5p与SOX4的靶向关系。分别将miR-299-5p mimics和pcDNA3.1-SOX4转染至胃癌细胞中构建过表达模型,采用CCK-8法、流式细胞仪检测细胞增殖、凋亡情况。Western blot检测靶基因SOX4及相关蛋白（Bcl-2、Bax）表达水平。结果:胃癌细胞中miR-299-5p呈低表达,SOX4呈过表达;miR-299-5p 过表达可显著下调SOX4蛋白水平;miR-299-5p与SOX4的mRNA 3' UTR区序列配对互补,SOX4是miR-299-5p的一个潜在靶作用结合位点;miR-299-5p过表达显著降低SOX4野生型荧光素酶活性,抑制胃癌细胞增殖,诱导细胞凋亡,同时可下调SOX4、Bcl-2水平,上调Bax蛋白表达水平;上调SOX4可逆转miR-299-5p过表达对胃癌细胞的作用效果。结论:miR-299-5p在胃癌细胞中呈低表达,其通过下调SOX4表达抑制细胞增殖,诱导细胞凋亡。     

miR-15b-5p靶向HDGF抑制胃癌细胞增殖并促进凋亡

目的:研究miR-15b-5p和HDGF对胃癌细胞增殖和凋亡的影响,并探讨其作用机制。方法:采用qRT-PCR法检测胃癌细胞中miR-15b-5p的表达;通过软件预测miR-15b-5p的下游靶基因;将对数生长期AGS细胞随机分为miR-15b-5p组（转染miR-15b-5p模拟物）、miR-NC组(转染阴性对照)、Scramled 组(转染阴性对照)、shHDGF组(转染质粒pcDNA3.1-shHDGF)、Vector+miR-15b-5p组(miR-15b-5p模拟物和pcDNA3.1载体共转染)、HDGF+miR-15b-5p组(miR-15b-5p模拟物和HDGF共转染),均以脂质体法转染;MTT法和流式细胞术检测各组细胞的增殖和凋亡变化;Western blot法和双荧光素酶报告基因实验分析miR-15b-5p对HDGF的靶向调控作用。结果:与正常胃黏膜上皮细胞GES-1相比,胃癌细胞SGC-7901和AGS中miR-15b-5p低表达,且过表达miR-15b-5p可抑制AGS细胞的增殖并促进凋亡。HDGF是miR-15b-5p的潜在靶标,miR-15b-5p能够抑制HDGF表达。而回补HDGF可逆转miR-15b-5p抑制胃癌细胞增殖与促进凋亡的作用。结论:miR-15b-5p可抑制胃癌细胞的增殖并促进凋亡,其作用机制可能与靶向抑制HDGF有关,提示miR-15b-5p可能成为胃癌诊断与治疗的潜在靶点。     

miR-218-5p靶向下调LPAR3抑制宫颈癌细胞增殖、迁移和侵袭

目的:探讨miR-218-5p通过调控LPAR3表达对宫颈癌细胞增殖、迁移和侵袭的影响。方法:qRT-PCR和Western blot检测人正常宫颈细胞H8和4种宫颈癌细胞（SiHa、HeLa、MS751和HT-3）中miR-218-5p和LPAR3的表达。以HeLa细胞为后续研究对象,分别构建过表达miR-218-5p和敲减LPAR3的HeLa细胞株,CCK-8法检测细胞存活情况,Transwell实验检测细胞的迁移和侵袭能力,Western blot检测细胞增殖相关蛋白CyclinD1、迁移侵袭相关蛋白MMP2和MMP9的表达。双荧光素酶报告基因实验和Western blot验证miR-218-5p和LPAR3的靶向调控关系。结果:与人正常宫颈细胞H8相比,4种宫颈癌细胞miR-218-5p的表达显著下调,LPAR3的表达显著上调。过表达miR-218-5p或敲减LPAR3均可抑制HeLa细胞的增殖、迁移和侵袭能力,抑制CyclinD1、MMP2和MMP9蛋白的表达。LPAR3是miR-218-5p的靶基因,miR-218-5p可负性调控LPAR3的表达。过表达LPAR3可逆转miR-218-5p对HeLa细胞增殖、迁移和侵袭的影响。结论:miR-218-5p通过靶向下调LPAR3表达抑制宫颈癌细胞的增殖、迁移和侵袭,miR-218-5p/LPAR3分子轴有望成为宫颈癌的潜在治疗靶点。     

MiR-886-5p Inhibition Inhibits Growth and Induces Apoptosis of MCF7 Cells

Background and Aims: To explore the molecular mechanisms of miR-886-5p in breast cancer., we examinedroles in inhibiting growth and migration of MCF-7 cells. Methods: MiR-886-5p mimics and inhibitors were usedto express or inhibit MiR-886-5p, respectively, and MTT and clone formation assays were used to determine thesurvival and proliferation. Hoechst 33342/ PI double staining was applied to detect apoptosis. The expressionof caspase-3, caspase-8, caspase-9, MT1-MMP, VEGF-C and VEGF-D was detected by Western blotting, andthe levels of MMP2 and MMP9 secreted from MCF-7 cells were assessed by ELISA. MCF-7 cell migration wasdetermined by wound healing and Transwell assays. Results: We found that the growth of MCF-7 cells wasinhibited upon decreasing miR-886-5p levels. Inhibiting miR-866-5p also significantly induced apoptosis anddecreased the migratory capacity of these cells. The expression of VEGF-C, VEGF-D, MT1-MMP, MMP2, andMMP9 was also found to be decreased as compared to controls. Conclusions: Our data show that downregulationof miR-886-5p expression in MCF-7 cells could significantly inhibit cell growth and migration. This might implythat inhibiting miR-886-5p could be a therapeutic strategy in breast cancer.     

PRKAA1 Promotes Proliferation and Inhibits Apoptosis of Gastric Cancer Cells Through Activating JNK1 and Akt Pathways

PRKAA1 (protein kinase AMP-activated catalytic subunit 1) is a catalytic subunit of AMP-activated protein kinase (AMPK), which plays a key role in regulating cellular energy metabolism through phosphorylation, and genetic variations in the PRKAA1 have been found to be associated with gastric cancer risk. However, the effect and underlying molecular mechanism of PRKAA1 on gastric cancer tumorigenesis, especially the proliferation and apoptosis, are not fully understood. Our data showed that PRKAA1 is highly expressed in BGC- 823 and MKN45 cells and is expressed low in SGC-7901 and MGC-803 cells in comparison with the other gastric cancer cells. PRKAA1 downregulation by shRNA or treatment of AMPK inhibitor compound C significantly inhibited proliferation as well as promoted cell cycle arrest and apoptosis of BGC-823 and MKN45 cells. Moreover, the expression of PCNA and Bcl-2 and the activity of JNK1 and Akt signaling were also reduced in BGC-823 and MKN45 cells after PRKAA1 downregulation. In vivo experiments demonstrated that tumor growth in nude mice was significantly inhibited after PRKAA1 silencing. Importantly, inactivation of JNK1 or Akt signaling pathway significantly inhibited PRKAA1 overexpression-induced increased cell proliferation and decreased cell apoptosis in MGC-803 cells. In conclusion, our findings suggest that PRKAA1 increases proliferation and restrains apoptosis of gastric cancer cells through activating JNK1 and Akt pathways.     

p27KIP1基因过表达诱导人胃癌细胞的凋亡

目的:研究p27KIP1基因对胃癌细胞凋亡的潜在调节作用。方法:采用脂质体转染法将p27KIP1全长cDNA转入胃癌细胞系SGC7901中,通过免疫印迹及RNA斑点杂交检测p27KIP1基因在蛋白质和mRNA水平的表达;通过DNA电泳、TUNEL染色、流式细胞仪及透射电镜等方法,观察目的基因对细胞凋亡的影响。结果:转染p27KIP1的SGC7901细胞在mRNA和蛋白质水平均有高水平p27KIP1的表达。诱导p27KIP1表达后,SGC7901细胞出现凋亡细胞所拥有典型的梯状DNA和超微结构改变,其凋亡指数也显著增加(P<0.01),并且p27KIP1的过表达使G1期前出现一个亚二倍体的凋亡峰,占14.68%。结论:p27KIP1基因能够诱导胃癌SGC7901细胞的凋亡。     

miR-1266-5p and miR-185-5p Promote Cell Apoptosis in Human Prostate Cancer Cell Lines

Objective: Small non-coding RNA molecules are dysregulated in prostate cancer (PCa). In our previous study,downregulation of miR-1266 and miR-185 was demonstrated in PCa tissues and cell lines. The aim of the presentstudy was to investigate whether miR-1266 and miR-185 are involved in the regulation of B-cell lymphoma (BCL) 2and BCL2L1, respectively, and whether transfection of PCa cell lines with miR-1266 and miR-185 mimics can altertumorigenic phenotypes. Methods: In order to investigate the regulation of BCL2 and BCL2L1 mRNA levels bymiR-1266 and miR-185, respectively, a luciferase reporter assay was used. Real-time PCR was also used to analyzechanges in the levels of BCL2 and BCL2L1 mRNAs in PCa cell lines following transfection with synthetic miR-1266and miR-185. Cell apoptosis was determined by Annexin V protein expression analysis via flow cytometry. In additionto the MTT assay, a cell proliferation assay was performed. Result: A luciferase assay confirmed that the BCL2 andBCL2L1 genes may be targeted by miR-1266 and miR-185, respectively, through binding to their 3′UTR regions.Transfection of PC3 and DU145 cells with miR-1266 and miR-185 induced apoptosis and reduced proliferation, whichalso revealed an inverse correlation with BCL2 and BCL2L1 gene expression in the treated cells. Conclusion: Ourdata suggests that miR-1266 and miR-185 may be novel candidates for further research in PCa treatment through theanti-apoptotic pathway.     

MiR-122-5p inhibits cell migration and invasion in gastric cancer by down-regulating DUSP4

Objective: To explore the relationship between miR-122-5p and DUSP4 and their effects on gastric cancer (GC) cell mobility and invasiveness.

Methods: Abnormally expressed miRNAs and mRNAs were analyzed using microarrays. The miR-122-5p and DUSP4 mRNA expression levels in GC tissues and cells were determined by RT-qPCR. The target relationship between miR-122-5p and DUSP4 was validated by dual luciferase reporter assay. GC cell mobility and invasiveness were respectively observed by wound healing assay and transwell invasion assay. Western blot and immunohistochemistry were used for detection of the expressions of DUSP4 protein and MMP2 and MMP9 proteins related to cell invasion and migration. The migration and invasion abilities of gastric cancer cells in vivo were evaluated according to the number of lung metastatic nodules in mice.

Results: The expression of miR-122-5p in GC tissues and cells was significantly down-regulated, whereas DUSP4 expression was up-regulated. Bioinformatics prediction strategies and dual luciferase reporter assay verified the binding sites of miR-122-5p on 3′UTR of DUSP4 and the target relationship between miR-122-5p and DUSP4. Overexpression of miR-122-5p and knockdown of DUSP4 in BGC-823 cells observantly suppressed GC cell mobility and invasiveness, whereas downregulation of miR-122-5p expression promoted cell metastasis. MiR-122-5p inhibited GC cell mobility and invasiveness and pulmonary tumor metastasis via downregulation of DUSP4.

Conclusion: MiR-122-5p restrained migration and invasion abilities of GC cells by repressing DUSP4.