lncRNA LINC00909靶向miR-548-3p对结直肠癌细胞放射敏感性的研究

目的 探讨lncRNA LINC00909是否通过靶向miR-548-3p而影响结直肠癌细胞放射敏感性。方法 采用qRT-PCR检测结直肠癌组织、癌旁组织中LINC00909、miR-584-3p的表达量;体外培养结直肠癌细胞SW480、SW620,分别将si-NC、si-LINC00909、miR-NC、miR-584-3p mimics、si-LINC00909与anti-miR-NC、si-LINC00909与anti-miR-584-3p转染至SW480、SW620细胞,用4 Gy照射细胞;克隆形成实验检测细胞存活分数及放射增敏比;MTT检测细胞增殖;Transwell小室实验检测细胞迁移及侵袭;双荧光素酶报告实验验证LINC00909、miR-584-3p的靶向关系。裸鼠皮下移植瘤实验检测干扰LINC00909表达或抑制miR-584-3p表达对照射后移植瘤重量的影响。结果 结直肠癌组织中LINC00909的表达水平显著升高(P<0.05),miR-584-3p的表达水平显著降低(P<0.05);干扰LINC00909表达或miR-584-3p过表达后细胞存活分数明显降低(P<0.05),放射增敏比分别为2.017、1.762,并可抑制增殖、迁移及侵袭(P<0.05);双荧光素酶报告实验证实LINC00909可靶向结合miR-584-3p;干扰LINC00909表达后移植瘤重量显著降低(P<0.05)。共转染anti-miR-584-3p后移植瘤重量显著升高(P<0.05)。结论 干扰LINC00909表达可通过上调miR-548-3p的表达而减弱结直肠癌细胞增殖、迁移及侵袭能力从而增强细胞放射敏感性。     

Radiosensitivity of lncrna linc00909 targeting mir-548-3p on colorectal cancer cells

Objective To investigate whether lncRNA LINC00909 affected the radiosensitivity of colorectal cancer cells by targeting miR-548-3p. Methods The expression levels of LINC00909 and miR-584-3p in colorectal cancer and adjacent tissues were detected by qRT-PCR. The colorectal cancer cells SW480 and SW620 were cultured in vitro, and transfected with si-NC, si-LINC00909, miR-NC, miR-584-3p mimics, si-LINC00909, and anti-miR-NC and si-LINC00909, and anti-miR-584-3p, respectively. The cells were irradiated with a dose of 4 Gy. The cell survival fraction and sensitization enhancement ratio (SER) were detected by clone formation assay. Cell proliferation was detected by MTT assay. Cell migration and invasion were assessed by Trans well chamber assay. The targeting relationship between LINC00909 and miR-584-3p was confirmed by dual luciferase reporter assay. The effect of interfering with the expression of LINC00909 or inhibiting the expression of miR-584-3p on the weight of the xenograft tumor after irradiation was evaluated by subcutaneous xenograft experiment in nude mice. Results The expression level of LINC00909 in colorectal cancer tissues was significantly up-regulated (P<0.05), whereas the expression level of miR-584-3p was significantly down-regulated (P<0.05). After interfering with the expression of LINC00909 or miR-584-3p overexpression, the cell survival fraction score was significantly reduced (P<0.05), the SERs were 2.017 and 1.762, and cell proliferation, migration and invasion were suppressed (all P<0.05). Dual luciferase reporter assay confirmed that LINC00909 could target and bind to miR-584-3p. After interfering with the expression of LINC00909, the weight of the transplanted tumor was significantly reduced (P<0.05), whereas the weight of the transplanted tumor was significantly increased after co-transfection with anti-miR-584-3p (P<0.05). Conclusion Interfering with the expression of LINC00909 can inhibit the proliferation, migration and invasion ability of colorectal cancer cells by up-regulating the expression of miR-548-3p, thereby enhancing the cell radiosensitivity.     

LncRNA LINC00958通过靶向miR-490-3p促进甲状腺乳头状癌细胞的增殖、侵袭和迁移

目的:研究LncRNA LINC00958对甲状腺乳头状癌细胞的影响及其作用机制。方法:TPC-1和K-1细胞分别分成Control、shRNA-NC、shRNA-LINC00958-1、shRNA-NC+inhibitor-NC、shRNA-LINC00958-1+inhibitor-NC和shRNA-LINC00958-1+miR-490-3p inhibitor组。TPC-1和K-1细胞移植的荷瘤鼠分别分为shRNA-NC、shRNA-LINC00958-1、shRNA-NC+inhibitor-NC、shRNA-LINC00958-1+inhibitor-NC和shRNA-LINC00958-1+miR-490-3p inhibitor组。用实时荧光定量PCR(RT-qPCR)检测LINC00958和miR-490-3p的表达水平;CCK-8检测细胞活力;Western blot检测蛋白表达水平;细胞划痕实验检测细胞迁移水平,Transwell小室检测细胞侵袭水平,克隆形成实验检测细胞增殖水平;双荧光素酶报告实验检测LINC00958和miR-490-3p的靶向关系。测定肿瘤质量及体积。结果:相比于正常组织,LINC00958在甲状腺癌组织中高表达;相比于Nthy-ori 3-1细胞,LINC00958在TPC-1和K-1细胞中高表达,miR-490-3p低表达。LINC00958沉默后,甲状腺乳头状癌细胞的增殖、侵袭和迁移能力显著降低。干扰miR-490-3p表达逆转LINC00958沉默对甲状腺乳头状癌细胞的增殖、迁移和侵袭效果,破坏LINC00958沉默对肿瘤生长的抑制效果。结论:抑制LINC00958表达可抑制TPC-1和K-1细胞增殖、迁移和侵袭能力,其机制与靶向miR-490-3p表达有关。     

BSN-AS2竞争性结合miR-219a-5p影响NSCLC细胞增殖、迁移、侵袭及凋亡

目的:探讨BSN-AS2竞争性结合miR-219a-5p调控非小细胞肺癌（non-small cell lung cancer,NSCLC)细胞增殖、迁移、侵袭和凋亡的机制。方法:qRT-PCR检测BSN-AS2和miR-219a-5p在NSCLC组织和细胞系中的表达;原位杂交FISH检测BSN-AS2和miR-219a-5p的信号强度;双荧光素酶报告基因检验miR-219a-5p 靶向调控BSN-AS2;Transwell、CCK8和Tunel细胞凋亡分别检测BSN-AS2-miR-219a-5p轴对侵袭、迁移、增殖和凋亡的影响;构建NSCLC裸鼠皮下移植瘤模型进行验证BSN-AS2-miR-219a-5p轴的调控作用。结果:BSN-AS2在NSCLC组织和细胞系中高表达,miR-219a-5p为低表达,BSN-AS2竞争性结合miR-219a-5p;siBSN-AS2组抑制NCI-H520细胞侵袭、迁移和增殖,且促进细胞凋亡,而In-miR-219a-5p组促进NCI-H520细胞侵袭、迁移和增殖,抑制细胞凋亡,siBSN-AS2+In-miR-219a-5p组相比siBSN-AS2组促进了NCI-H520细胞侵袭、迁移和增殖,抑制细胞凋亡;BSN-AS2增加体内肿瘤细胞增殖和肿瘤生长,miR-219a-5p则能抑制。结论:BSN-AS2竞争性结合miR-219a-5p促进NSCLC细胞侵袭、迁移和增殖,且抑制凋亡,而干扰BSN-AS2-miR-219a-5p轴可能作为抗NSCLC的新靶点。     

Circ-RPPH1 knockdown retards breast cancer progression via miR-328-3p-mediated suppression of HMGA2

BackgroundCircular RNA Ribonuclease P RNA Component H1 (circ-RPPH1) was confirmed to act as an oncogene in many cancers to promote cancer progression. However, the exact function and mechanism of circ-RPPH1 in breast cancer (BC) remain vague.MethodsThe expression of circ-RPPH1, microRNA (miR)-328-3p and high-mobility group AT-hook 2 (HMGA2) was detected using quantitative real-time polymerase chain reaction and western blot. Cell viability, apoptosis, migration and invasion were determined using cell counting kit-8 assay, flow cytometry and transwell assay, respectively. Glucose metabolism was calculated by detecting glucose uptake and lactate production. The target correlations between miR-328-3p and circ-RPPH1 or HMGA2 were confirmed by dual-luciferase reporter assay. The murine xenograft model was established to conduct in vivo experiments.ResultsCirc-RPPH1 expression was elevated and miR-328-3p was decreased in BC tissues and cells. Circ-RPPH1 knockdown or miR-328-3p re-expression suppressed cell proliferation, migration, invasion and glycolysis but induced apoptosis in BC in vitro. Circ-RPPH1 was a sponge of miR-328-3p, and silencing of miR-328-3p reversed the inhibitory effects of circ-RPPH1 knockdown on BC cell malignant phenotypes and glycolysis. MiR-328-3p directly targeted HMGA2, and HMGA2 overexpression abolished the action of miR-328-3p in BC cells. Besides, circ-RPPH1 could regulate HMGA2 expression by miR-328-3p in BC cells. Moreover, murine xenograft model analysis suggested circ-RPPH1 knockdown inhibited tumor growth in vivo.ConclusionCirc-RPPH1 knockdown retarded cell malignant phenotypes and glycolysis via miR-328-3p/HMGA2 axis in BC, providing a potential therapeutic target for BC treatment.     

LINC00243靶向miR-1976促进甲状腺癌细胞增殖、迁移和侵袭

目的:探讨长链非编码RNA（lncRNA）LINC00243对甲状腺癌细胞增殖、迁移及侵袭的影响和分子机制。方法:实时荧光定量PCR（qRT-PCR）检测正常甲状腺细胞系（HT-ori3）和甲状腺癌细胞系（BCPAP、TPC-1和SW1736）中LINC00243和miR-1976的表达水平。将LINC00243小干扰RNA（si-LINC00243）、miR-1976模拟物（miR-1976 mimics）分别转染TPC-1细胞。细胞计数试剂盒（CCK-8）检测细胞活力;Transwell实验检测细胞迁移和侵袭数量;蛋白质印记（Western blot）检测细胞周期素D1（CyclinD1）、基质金属蛋白酶2（MMP2）和MMP9的表达水平。双荧光素酶报告基因实验和qRT-PCR验证LINC00243和miR-1976的靶向调控关系。结果:与HT-ori3细胞比较,3种甲状腺癌细胞中LINC00243的表达水平显著升高,miR-1976的表达水平显著降低。沉默LINC00243或高表达miR-1976均可抑制TPC-1细胞的增殖、迁移和侵袭,抑制CyclinD1、MMP2和MMP9蛋白的表达（P＜0.05）。LINC00243靶向负性调控miR-1976表达。低表达miR-1976可逆转沉默LINC00243对TPC-1细胞增殖、迁移和侵袭的抑制作用（P＜0.05）。结论:在甲状腺癌细胞中,LINC00243呈高表达,miR-1976呈低表达。LINC00243通过靶向调控miR-1976促进甲状腺癌细胞增殖、迁移和侵袭。     

LINC00909靶向miR-365a-5p/FGFBP1分子轴调控结肠癌细胞增殖、迁移及侵袭的实验研究

目的 探讨LINC00909对结肠癌细胞增殖、迁移、侵袭的影响及可能机制.方法 购买正常结肠上皮细胞NCM460,结肠癌细胞HCT8、Caco-2及DLD-1;用实时荧光定量PCR(RT-qPCR)及蛋白质印迹法(Western blotting)检测NCM460细胞及结肠癌细胞中LINC00909、miR-365a-...     

Down-regulation of c-Met and Bcl2 by microRNA-206, activates apoptosis,and inhibits tumor cell proliferation,migration and colony formation

Hsa-miRNA-206 (miR-206), highly expressed in skeletal muscle, has recently been discovered to have anticancer properties in different tissues. However, the role of miR-206 on lung cancer is still ambiguous. In this study, we investigated the role of miR-206 on the development of lung cancer. The results indicated that miR-206 expression was suppressed in lung cancer tissues and very low levels were found in non-small cell lung cancer (NSCLS) cell liness. Transient transfection of miR-206 into cultured A549 and SK-MES-1 cells led to significant decrease in cell growth, migration, invasion and colony formation, and promoted cell apoptosis. Using bioinformatics, we identified putative miR-206 binding sites within the 3′-untranslated region (3′-UTR) of the human c-Met and Bcl2 mRNA. The expression of c-Met and Bcl2 proteins were shown to be down-regulated after treated with miR-206 by subsequent Western blot and qRT-PCR analysis. Conversely, up-regulation of c-Met and Bcl2 were confirmed in tissue samples of human lung cancer, with its level inversely correlated with miR-206 expression. In addition, miR-206 also decreased the gene expression of MMP-9, CCND1 and CCND2 while increased the gene expression of p57 (Kip2) in A549 and SK-MES-1 cells. Taken together, our results demonstrated that miR-206 suppressed c-Met and Bcl2 expression in NSCLS and could function as a potent tumor suppressor in c-Met/Bcl2-over expressing tumors. Inhibition of miR-206 function could contribute to aberrant cell proliferation, migration, invasion and apoptosis, leading to NSCLS development.     

LncRNA NR2F2-AS1 induces epithelial-mesenchymal transition of non-small cell lung cancer by modulating BVR/ATF-2 pathway via regulating miR-545-5p/c-Met axis

Non-small cell lung cancer (NSCLC) is one type of the most common cancers, which results in the major death worldwide. This study focuses on the understanding of the molecular mechanism of lncRNA NR2F2-AS1 and its regulation on epithelial-mesenchymal transition (EMT) in the development of NSCLC. Expressions of lncRNA NR2F2-AS1, miR-545-5p, c-Met, biliverdin reductase (BVR), ATF-2 and EMT-related markers in NSCLC tissues and cells were measured by western blotting and RT-qPCR assays. The impact of lncRNA NR2F2-AS1 and miR-545-5p on the cell proliferation, migration, invasion and EMT were analyzed by CCK-8, colony formation, wound healing and transwell assays. The interactions among lncRNA NR2F2-AS1, miR-545-5p and c-Met predicted by bioinformatic analysis were evaluated through dual luciferase reporter assay and fluorescence in situ hybridization (FISH). After generating tumor xenografts, immunohistochemistry was utilized to measure the expression of Ki-67 and EMT-related proteins in vivo. Our results showed that lncRNA NR2F2-AS1, c-Met, BVR and ATF-2 were overexpressed while miR-545-5p was silenced in NSCLC tissues and cells. Silencing of lncRNA NR2F2-AS1 or upregulating miR-545-5p significantly inhibited the cell proliferation, migration, invasion and EMT process. The EMT process could be inhibited by suppressing c-Met/BVR/ATF-2 axis. The tumor xenograft experiments demonstrated that the tumor growth and EMT process were significantly inhibited by silencing lncRNA NR2F2-AS1 or overexpression of miR-545-5p in vivo. LncRNA NR2F2-AS1 promoted the NSCLC development through suppressing miR-545-5p to activate EMT process through c-Met/BVR/ATF-2 axis. Our study indicated that lncRNA NR2F2-AS1 and miR-545-5p could be used as potential therapeutic targets to improve NSCLC treatment.     

LncRNA RMRP silence curbs neonatal neuroblastoma progression by regulating microRNA-206/tachykinin-1 receptor axis via inactivating extracellular signal-regulated kinases

Background: Neuroblastoma is the commonest malignancy in neonates. Long non-coding RNA (lncRNA) RNA component of mitochondrial RNA processing endoribonuclease (RMRP) has been reported to be an oncogenic factor in some malignancies. However, its roles and molecular mechanisms in neuroblastoma progression are poor defined.

Methods: The expression of RMRP, microRNA-206 (miR-206), and tachykinin-1 receptor (TACR1) mRNA was measured by RT-qPCR assay. Protein levels of TACR1, phosphorylated extracellular signal-regulated kinases (ERK) 1/2 (p-ERK1/2) and ERK1/2 were detected by western blot assay. Cell proliferation was assessed by CCK-8 and colony formation assays. Cell migratory and invasive capacities were determined using Transwell migration and invasion assays. The interaction between miR-206 and RMRP or TACR1 was verified by luciferase assay. The roles and molecular mechanisms of RMRP knockdown on the growth of neuroblastoma xenografts were examined in vivo.

Results: RMRP was highly expressed in neuroblastoma tissues. RMRP knockdown inhibited proliferation, migration and invasion in neuroblastoma cells. Moreover, TACR1 was a target of miR-206 and RMRP performed as a molecular sponge of miR-206 to sequester miR-206 from TACR1 in neuroblastoma cells. TACR1 overexpression abrogated the inhibitory effect of RMRP downregulation on neuroblastoma cell progression by activating ERK1/2 pathway. Inhibition of TACR1 and ERK1/2 pathway abated RMRP-mediated pro-proliferation effect in neuroblastoma cells. RMRP knockdown hindered neuroblastoma xenograft growth by regulating miR-206/TACR1 axis via inactivating ERK1/2 pathway in vivo.

Conclusion: RMRP knockdown hindered the tumorigenesis and progression of neuroblastoma by regulating miR-206/TACR1 axis via inactivating ERK1/2 pathway, hinting a potential therapeutic target for neuroblastoma.     

CircNRIP1 acts as a sponge of miR-1200 to suppress osteosarcoma progression via upregulation of MIA2

Circular RNAs (circRNAs), a class of non-coding RNAs, play an essential role in embryo development and carcinogenesis, circNRIP1 was recently identified to promote development of multiple human cancers. This study investigated the role of circNRIP1 in osteosarcoma (OS) cells and the potential mechanisms relating to the sponging miRNAs and their target genes. OS cell lines and normal human osteoblasts were grown for qRT-PCR analysis of circNRIP1 expression and functions of circNRIP1 expression in OS cell proliferation, migration, and invasion in vitro. Bioinformatics analysis was then performed to predict the sponge miRNA of circNRIP1 and the target gene, which was confirmed by using the dual-luciferase reporter assay. The in vivo functions of circNRIP1 was evaluated in OS cell xenograft models, while levels of relevant marker genes were examined using immunohistochemistry. CircNRIP1 was mainly localized in OS cell cytoplasm and significantly lower in OS cell lines than in normal human osteoblasts. CircNRIP1 overexpression significantly inhibited OS cell proliferation, migration, and invasion in vitro. miR-1200 was predicted as the sponge miRNA of circNRIP1 and directly interacted with circNRIP1 confirmed by the dual-luciferase reporter assay. Moreover, miR-1200 overexpression significantly alleviated the inhibitory effect of circNRIP1 on OS cells. A protein-coding gene MIA2 was identified as the miR-1200 targeting gene and reversely associated with miR-1200 expression in OS cells. Increase in MIA2 expression in a murine OS cell xenograft model was associated with circNRIP1 expression in inhibition of OS cell xenograft growth in vivo. These data support the circNRIP1 OS-suppressive role by sponge of miR-1200 expression and in turn to upregulate MIA2 expression.     

LINC00460靶向miR-380-3p对皮肤鳞状细胞癌细胞增殖、迁移、侵袭和凋亡的影响

目的:探讨LINC00460对皮肤鳞状细胞癌（CSCC）细胞增殖、迁移、侵袭和凋亡的影响及可能机制。方法:实时荧光定量PCR（RT-qPCR）分析人类永生化表皮细胞（HaCaT）和CSCC细胞（SCC13、A431和HSC-5）中LINC00460和miR-380-3p的表达水平。将LINC00460小干扰RNA（si-LINC00460）、miR-380-3p模拟物（miR-380-3p mimics）、si-LINC00460+miR-380-3p抑制物（anti-miR-380-3p）分别转染A431细胞,细胞计数试剂盒（CCK-8）检测细胞活力,流式细胞术分析细胞凋亡,Transwell实验分析细胞迁移和侵袭能力,蛋白质印记（Western blot）检测细胞周期素D1（CyclinD1）、基质金属蛋白酶2（MMP2）、基质金属蛋白酶9（MMP9）、上皮细胞钙黏蛋白（E-Cadherin）、神经钙黏蛋白（N-Cadherin）、波形蛋白（Vimentin）的表达。双荧光素酶报告基因实验、RT-qPCR确定LINC00460对miR-380-3p的靶向调控作用。结果:与HaCaT比较,CSCC细胞中LINC00460表达显著增加,miR-380-3p表达显著降低（P＜0.05）。下调LINC00460表达后A431细胞增殖活力、迁移和侵袭细胞数以及CyclinD1、MMP2、MMP9、N-Cadherin和Vimentin蛋白表达显著降低（P＜0.05）,凋亡率、E-Cadherin蛋白表达显著升高（P＜0.05）。上调miR-380-3p表达后A431细胞增殖活力、迁移和侵袭细胞数以及CyclinD1、MMP2和MMP9表达显著降低（P＜0.05）,凋亡率显著升高（P＜0.05）。与下调LINC00460比较,同时下调LINC00460和miR-380-3p后A431细胞增殖活力、迁移和侵袭细胞数以及CyclinD1、MMP2、MMP9、N-Cadherin和Vimentin蛋白表达显著升高（P＜0.05）,凋亡率、E-Cadherin蛋白表达显著降低（P＜0.05）。LINC00460靶向负调控miR-380-3p表达。结论:CSCC细胞中LINC00460表达增加,下调LINC00460能够降低CSCC细胞的增殖、迁移和侵袭能力,诱导细胞凋亡,其机制与靶向调控miR-380-3p表达有关。     

Long Noncoding RNA LINC01703 Exacerbates the Malignant Properties of Non-Small Cell Lung Cancer by Upregulating MACC1 in a MicroRNA-605-3p-Mediated Manner

Long intergenic nonprotein-coding RNA 1703 (LINC01703) has diagnostic significance in lung adenocarcinoma. However, its specific roles in non-small cell lung cancer (NSCLC) and downstream mechanisms have not been investigated. In the current study, we characterized the role of LINC01703 in NSCLC malignancy and elucidated its detailed mechanism of action. LINC01703 expression was measured by qRT-PCR. The regulatory effects of LINC01703 on the malignancy of NSCLC cells were assessed by multiple functional experiments. The targeted interaction was confirmed by RNA immunoprecipitation and luciferase reporter assays. Herein, overexpression of LINC01703 in NSCLC was indicated in the TCGA database and further proven in our cohort. Functional studies revealed that knocking down LINC01703 repressed cell proliferation, colony formation, migration, and invasion in vitro, which was accompanied by the induction of apoptosis. The tumor growth of LINC01703-silenced cells was also inhibited in vivo. Mechanistic analyses revealed that LINC01703 functioned as a competing endogenous RNA for microRNA-605-3p (miR-605-3p) in NSCLC cells, which thereby upregulated the miR-605-3p target metastasis associated with colon cancer 1 (MACC1). Rescue experiments highlighted that the regulatory actions of LINC01703 ablation on NSCLC cells were abolished in response to miR-605-3p downregulation or MACC1 overexpression. In conclusion, LINC01703 enhanced the aggressiveness of NSCLC cells by altering miR-605-3p/MACC1. Our work suggests the therapeutic potential of LINC01703/miR-605-3p/MACC1 in NSCLC.Key words: Non-small cell lung cancer (NSCLC), Long noncoding RNAs (lncRNAs), Competing endogenous RNA (ceRNA) model, Therapeutic target     

LINC00511靶向miR-497-5p调控胃癌细胞增殖、迁移和侵袭及机制研究

目的:探讨LINC00511对胃癌细胞增殖、迁移和侵袭的影响及其作用机制。方法:将pcDNA、pcDNA-LINC00511、si-NC、si-LINC00511、miR-NC、miR-497-5p分别转染至MGC-803细胞中,分别记为pcDNA组、pcDNA-LINC00511组、si-NC组、si-LINC00511组、miR-NC组、miR-497-5p组;将si-LINC00511质粒分别与anti-miR-NC、anti-miR-497-5p共转染至MGC-803细胞中,分别记为si-LINC00511+anti-miR-NC组、si-LINC00511+anti-miR-497-5p组。实时荧光定量PCR（RT-qPCR）检测miR-497-5p和LINC00511表达水平;蛋白质印迹（Western Blot）法检测细胞周期素D1（cyclin D1,CyclinD1）、p21、基质金属蛋白酶2（matrix metalloproteinase 2,MMP2）、基质金属蛋白酶9（matrix metalloproteinase 9,MMP9）蛋白表达水平;四甲基偶氮唑盐比色法(MTT)检测细胞活性;Transwell检测细胞迁移和侵袭;双荧光素酶报告基因实验检测LINC00511和miR-497-5p的靶向关系。结果:与正常胃黏膜上皮细胞GES-1相比,胃癌细胞MGC-803、MKN-45、AGS中miR-497-5p表达水平显著降低,LINC00511表达水平显著升高。LINC00511靶向调控miR-497-5p的表达。抑制LINC00511表达和miR-497-5p过表达可降低细胞活性和迁移、侵袭数量,降低CyclinD1、MMP2、MMP9蛋白表达水平,提高p21蛋白表达水平。干扰miR-497-5p表达逆转了抑制LINC00511表达对胃癌MGC-803细胞增殖、迁移和侵袭的抑制作用。结论:抑制LINC00511表达可抑制胃癌细胞增殖、迁移和侵袭,其机制可能与miR-497-5p表达有关,将为胃癌的治疗提供新思路和新靶点。     

miR-181a对人食管癌TE11细胞增殖、迁移和侵袭能力的影响

目的:通过构建miR-181a的真核表达载体,研究其对人食管癌TE11细胞增殖、迁移和侵袭能力的影响。方法:以95C细胞基因组DNA为模板,扩增得到miR-181a前体序列,插入表达载体pcDNA3.1(+)克隆获得pcDNA3.1(+)-miR-181a。将真核表达载体pcDNA3.1(+)-miR-181a转染到TE11细胞中,并采用实时荧光定量-PCR(real-time fluorogentic quantitative-PCR,RFQ-PCR)对其表达情况进行验证。分别采用MTT法、细胞划痕法和Boyden小室法检测转染重组质粒pcDNA3.1(+)-miR-181a对TE11细胞增殖能力、迁移能力和侵袭能力的影响。结果:成功构建了插入miR-181a基因片段的真核表达载体pcDNA3.1(+)-miR-181a;RFQ-PCR检测结果表明,转染pcDNA3.1(+)-miR-181a的TE11细胞能够过表达成熟的miR-181a(P<0.05)。过表达miR-181a的TE11细胞增殖能力、迁移能力和细胞侵袭能力均明显增强。结论:miR-181a在TE11细胞中过表达能够增加细胞的增殖、迁移和侵袭能力,为进一步深入研究miR-181a在肿瘤中的作用机制提供了实验依据。     

MTA1 promotes the invasion and migration of non-small cell lung cancer cells by downregulating miR-125b

Background

The metastasis-associated gene 1 (MTA1) has been identified as one critical regulator of tumor metastasis. Previously, we identified miR-125b as a downregualted miRNA in non-small cell lung cancer (NSCLC) cell line upon MTA1 depletion. However, the role of miR-125b and MTA1 in the regulation of NSCLC metastasis remains unclear.

Methods

Stable MTA1 knockdown NSCLC cell lines 95D and SPC-A-1 were established by transfection with MTA1 shRNA. The effects of MTA1 depletion on the expression of miR-125b and cell migration and invasion were examined by real-time PCR, wound healing and matrigel invasion assay.

Results

MTA1 knockdown led to the upregulation of miR-125b level in NSCLC cells. Furthermore, MTA1 knockdown reduced while miR-125b inhibitor enhanced cell migration and invasion of NSCLC cells. Notably, miR-125b inhibitor antagonized MTA1 siRNA induced inhibition of cell migration and invasion.

Conclusion

MTA1 and miR-125b have antagonistic effects on the migration and invasion of NSCLC cells. The newly identified MTA1-miR-125b axis will help further elucidate the molecular mechanism of NSCLC progression and suggest that ectopic expression of miR-125b is a potentially new therapeutic regimen against NSCLC metastasis.