miR-146b-5p对胶质瘤TJ905细胞生长的抑制作用及其机制探讨

  目的  在TJ905胶质母细胞瘤细胞系中观察miR-146b-5p对MMP16的调控作用及其对细胞侵袭、迁移、增殖和凋亡的影响。  方法  分别用无义序列表达质粒(对照组)和miR-146b-5p表达质粒(P-miR-146b-5p组)转染TJ905细胞, 用qRT-PCR和Western blot检测两组细胞miR-146b-5p的表达水平及MMP16 mRNA和蛋白的表达水平, 用体外迁移侵袭实验及流式细胞术检测转染细胞迁移、侵袭、细胞周期分布和凋亡水平, 并分析这些变化的相互关系。  结果  与对照组相比, p-miR-146b-5p组MMP16 mRNA和蛋白表达量明显降低, 二者间呈正相关且均与miR-146b-5p表达量呈负相关。p-miR-146b-5p组侵袭和迁移细胞数均明显低于对照组, 并均与同组MMP16蛋白表达量呈正相关; 而凋亡水平明显高于对照组, 并与同组miR-146b-5p表达量呈正相关, 但两组细胞周期时相分布无显著性差异。  结论  miR-146b-5p是胶质瘤的抑瘤miRNA; 补充外源性miR-146b-5p可促进胶质瘤细胞凋亡, 并通过抑制靶基因MMP16表达阻止其侵袭迁移; 提示miR-146b-5p在恶性胶质瘤基因治疗方面具有重要的潜在应用价值。      

Knockdown of linc00152 inhibits the progression of gastric cancer by regulating microRNA-193b-3p/ETS1 axis

Background: Gastric cancer (GC) is a serious threat for public health worldwide. Long non-coding RNA (lncRNA) linc00152 has been well reported to be an oncogene and a potential biomarker in multiple cancers including GC. However, the molecular mechanisms of linc00152 in GC development need to be further investigated.

Methods: RT-qPCR assay was employed to detect the levels of linc00152, microRNA-193b-3p (miR-193b-3p) and ETS1 mRNA. ETS1 protein level was measured by western blot assay. Cell proliferative, migratory and invasive capacities were assessed by colony formation together with CCK-8 assays, transwell migration and invasion assays, respectively. Bioinformatics analyses and luciferase reporter assay were used to explore whether miR-193b-3p could interact with linc00152 or ETS1 3?UTR. The roles and molecular basis of linc00152 silence on the growth of GC xenograft tumors were tested in vivo.

Results: Linc00152 expression was notably upregulated in GC tissues and cells. The proliferative, migratory and invasive abilities of GC cells were weakened by linc00152 depletion, miR-193b-3p overexpression or ETS1 knockdown. Linc00152 upregulation inhibited miR-193b-3p expression by direct interaction and abolished miR-193b-3p-mediated anti-proliferation, anti-migration and anti-invasion effects in GC cells. ETS1 was a target of miR-193b-3p and linc00152 could promote ETS1 expression by downregulating miR-193b-3p. In vivo experiments further validated that linc00152 knockdown inhibited the growth of GC xenograft tumors by upregulating miR-193b-3p and downregulating ETS1.

Conclusion: Knockdown of linc00152 inhibited GC progression by sequestering miR-193b-3p from ETS1 in vitro and in vivo, elucidating a novel molecular mechanism of linc00152 in promoting GC carcinogenesis.     

miR-26b-3p对乳腺癌细胞生物学行为的影响及作用机制研究

背景与目的：miRNA是一类长度为21~23个核苷酸的单链非编码RNA分子,其作用机制主要为靶向于mRNA的3’非翻译区（3’ untranslated region,3’UTR）从而抑制其靶基因的表达。miRNA在肿瘤的发生、发展过程中发挥着关键作用,探讨miR-26b-3p对乳腺癌生物学行为的影响及作用机制。方法：通过实时荧光定量聚合酶链反应（real-time fluorescence quantitative polymerase chain reaction,RTFQ-PCR）检测miR-26b-3p在三种乳腺癌细胞系MCF-7、MDA-MB-231和MDA-MB-453中的表达,选取miR-26b-3p表达水平最低的乳腺癌细胞转染miR-26b-3p mimics后,采用细胞计数试剂盒（cell counting kit-8,CCK-8）法检测细胞的增殖,采用transwell迁移和侵袭实验检测细胞迁移和侵袭能力,通过小动物活体成像及裸鼠移植瘤模型检测miR-26b-3p对乳腺癌细胞裸鼠移植瘤生长和转移的影响,采用双荧光素酶报告基因分析检测miR-26b-3p与锌指E盒结合同源盒基因1（zinc finger E-box binding homeobox 1,ZEB1）的相互作用,采用RTFQ-PCR和蛋白质印迹法（Western blot）检测ZEB1的表达。结果：乳腺癌细胞系MDA-MB-453中miR-26b-3p表达最低,在MDA-MB-453细胞中转染miR-26b-3p mimics后,miR-26b-3p的表达水平显著升高（P<0.05）,细胞的增殖能力显著降低（P<0.05）,细胞的迁移（P<0.001）和侵袭能力（P<0.01）显著降低。过表达miR-26b-3p可抑制裸鼠体内乳腺癌移植瘤的生长和转移。miR-26b-3p可与ZEB1的3’UTR结合,抑制ZEB1的表达。结论：miR-26b-3p可靶向于ZEB1,抑制乳腺癌细胞的增殖、迁移和侵袭,抑制乳腺癌的生长和转移。     

miR-124-3p靶向FOXQ1抑制宫颈鳞状细胞癌细胞增殖和侵袭的机制研究

目的:探讨miR-124-3p在宫颈鳞状细胞癌（cervical squamous cell carcinoma,CSCC）中的表达水平及对细胞增殖、侵袭能力的影响,初步阐明miR-124-3p对癌基因叉头框蛋白Q1(forkhead box Q1,FOXQ1)的靶向调控机制。方法:收集2015年1月至2017年12月手术切除的CSCC组织标本61份,分别应用RT-qPCR和IHC检测癌组织和癌旁组织中miR-124-3p和FOXQ1蛋白的表达水平,分析miR-124-3p和FOXQ1 mRNA表达的相关性;RT-qPCR检测miR-124-3p和FOXQ1 mRNA在人CSCC细胞株（SiHa和CaSki）及人宫颈永生化鳞状细胞株（Ect1/E6E7）中的表达水平;应用miR-124-3p模拟物转染CaSki细胞,分别采用CCK-8法和Transwell小室检测miR-124-3p对细胞增殖和侵袭能力的影响;采用Western blot检测miR-124-3p对FOXQ1、E-cadherin和Vimentin蛋白表达水平的影响;最后,应用双荧光素酶报告基因验证miR-124-3p对FOXQ1的靶向调控作用。结果:miR-124-3p在CSCC组织的表达水平低于癌旁组织（P＜0.05）,在人CSCC细胞株（SiHa和CaSki）中的表达水平也均低于人宫颈永生化鳞状细胞株（Ect1/E6E7）（P＜0.05）;与转染阴性对照细胞比较,转染miR-124-3p模拟物的CaSki细胞的增殖和侵袭能力明显受到抑制（P＜0.05）。FOXQ1 mRNA和蛋白在CSCC组织中的表达水平均显著高于癌旁组织(P＜0.05),相关性分析显示,FOXQ1 mRNA的表达水平与miR-124-3p呈负相关(r=-0.882,P＜0.05)。在转染miR-124-3p模拟物后,CSCC细胞株CaSki中FOXQ1和Vimentin蛋白表达水平均降低,而E-cadherin蛋白表达增高。双荧光素酶报告基因试验确认miR-124-3p可通过与FOXQ1 mRNA的3' UTR直接结合,靶向调控FOXQ1的表达。结论:miR-124-3p在CSCC中表达下调,其通过靶向调控FOXQ1的表达影响细胞的上皮间质转化状态,从而影响CSCC细胞的增殖和侵袭。     

RNA-seq reveals microRNA-302b as a suppressor of prostate cancer epithelial-mesenchymal transition by targeting RELA/NF-κB

To identify novel biomarker(s) in prostate cancer and demonstrate the mechanistic involvements in this disease, RNA-seq was employed to reveal the differentially expressed genes in the blood samples from prostate cancer patients. Relative expression of miR-302b-3p was evaluated using real-time PCR. The potential regulation of RELA by miR-302b-3p was assessed by luciferase reporter assay. Protein levels of NF-κB, Vimentin, N-cadherin and E-cadherin, were quantified using western blotting. Transwell chamber was employed to measure cell migratory and invasive capacity, while cell attachment/detachment assay was performed to evaluated epithelial-mesenchymal transition (EMT)-related behavior. Xenograft tumor model was adopted to determine the anti-tumor activity of miR-302b-3p in vivo. We demonstrated miR-302b-3p was down-regulated in prostate cancer both in vivo and in vitro. We predicted and identified RELA as directly targeted by miR-302b-3p. Ectopic miR-302b-3p expression in PC-3 cells significantly suppressed cell migration, invasion, attachment, detachment capacity, which was accompanied with a decrease in the expression of N-cadherin and Vimentin, and an increase of E-cadherin expression. MiR-302b-3p-proficiency greatly delayed xenograft tumor growth and associated with favorable overall survival. Co-introduction of RELA completely abolished anti-tumor effects of miR-302b-3p, which indicated a potential genetic interaction between RELA/NF-κB and miR-302b-3p. We characterized the aberrant down-regulation of miR-302b-3p in prostate cancer and unraveled a possible involvement of miR-302b-3p/RELA signaling axis in this scenario.     

Combined targeting of vascular endothelial growth factor C (VEGFC) and P65 using miR-27b-3p agomir and lipoteichoic acid in the treatment of gastric cancer

BackgroundGastric cancer is the second leading cancer-related mortality worldwide and more effective treatment strategies are urgently needed to combat the disease. Using lipoteichoic acid (LTA) and miR-27b-3p agomir, we aimed to assess the efficacy of this combination of therapies in treating gastric cancer.MethodsThe RNA levels of miR-27b-3p, FOXO3, MET, KRAS, vascular endothelial growth factor C (VEGFC), TSC1, and P65 were analyzed by quantified-PCR (Q-PCR) and the cell viability of AGS cells was analyzed by MTT. Confirm Luciferase reporter assays were used to explore the putative miR-27b-3p binding sites and Western blot analyzed the protein level of GAPDH, VEGFC, P65, AKT, and phosphorylated-AKT (p-AKT). The level of P65 in both the cytoplasm and nucleus of AGS cells was visualized by immunofluorescence assay. Subcutaneous xenograft models of gastric cancer were established, and mice were treated with miR-27b-3p agomir, LTA, or both. Hematoxylin-eosin staining and Ki-67 immunohistochemistry analysis of tumor tissues were then performed.ResultsThe results showed that the decreased expression of miR-27b-3p in gastric cancer cell lines inhibited the viability of AGS cells, and VEGFC was confirmed as the target of miR-27b-3p. In addition, ectopic expression of miR-27b-3p significantly inhibited the AKT pathway in AGS and N87 cells, and LTA suppressed the proliferation of gastric cancer cells by inhibiting the NF-κB pathway. In an established xenograft model, both miR-27b-3p agomir alone and LTA treatment alone inhibited tumor growth and treatment which combined the two showed an even stronger inhibitory effect.ConclusionsTaken together, the combined use of LTA and miR-27b-3p agomir exhibited a synergistic effect in the treatment of gastric cancer.     

miR-17-5p promotes human breast cancer cell migration and invasion through suppression of HBP1

MicroRNAs have been implicated in regulating diverse cellular pathways. Emerging evidence indicate that the miR-17-92 cluster may have a causal role in breast cancer tumorigenesis as a novel class of oncogenes, but the role of these miRNAs in breast cancer invasion and migration remains unexplored. The aims of this study were to verify the effect of miR-17-5p (an important member of the miR-17-92 cluster) on the invasive and migratory ability of breast cancer cells. The matching of miR-17-5p and HMG box-containing protein 1 (HBP1) was predicted by TargetScan and confirmed by DNA constructs and luciferase target assay. The expression levels of miR-17-5p and its candidate target-HBP1 in MCF7 and MDA-MB-231 breast cancer cells were measured by real-time PCR and western blotting. Effects of miR-17-5p in cell cycle progression, proliferation, invasion and migration were evaluated by flow cytometry assay, 3-(4,-dimethy -lthiazol-2-yl)-2,-diphenyl -tetrazoliumbromide assay, soft-agar colony formation assay, and transwell invasive and migratory assay, respectively. The results showed that miR-17-5p was highly expressed in high-invasive MDA-MB-231 breast cancer cells but not in low-invasive MCF-7 breast cancer cells. Over-expression of miR-17-5p in MCF-7 cells rendered them the invasive and migratory abilities by targeting HBP1/β-catenin pathway. On the other hand, down-regulation of endogenous miR-17-5p suppressed the migration and invasion of MDA-MB-231 cells in vitro. These findings suggest that miR-17-5p plays an important role in breast cancer cell invasion and migration by suppressing HBP1 and subsequent activation of Wnt/β-catenin.     

miR-126-5p靶向Notch2 对结肠癌SW480 细胞增殖、迁移、侵袭和凋亡的影响

目的:探讨miR-126-5p 对结肠癌SW480 细胞增殖、迁移、侵袭和凋亡的影响及其作用机制。方法：用miR-126 mimic和pcDNA Notch2（pc-Notch2）等分别或同时转染结肠癌SW480 细胞,用qPCR法检测miR-126-5p 和Notch2 的表达;荧光素酶报告实验观察miR-126-5p 和Notch2 的靶向关系;CCK-8 法、划痕愈合实验、Transwell 小室法和Annexin V/PI 染色流式细胞术分别检测转染细胞的增殖、迁移、侵袭和凋亡,Western blotting 检测Notch2、增殖细胞核抗原（proliferating cell nuclear antigen, PCNA）、cleaved Caspase-3、MMP-2 和MMP-9 的表达。结果：转染miR-126 mimic 能显著升高SW480 细胞miR-126-5p 的表达水平（P<0.01）和显著抑制SW480 细胞Notch2 的表达（P<0.01）,同时证实Notch2 上存在miR-126-5p 的结合位点。上调miR-126-5p 显著抑制SW480 细胞增殖并降低PCNA的表达水平（P<0.01）、升高细胞凋亡率和cleaved Caspase-9 的表达水平（均P<0.01）,pc-Notch2显著减弱miR-126 mimic 对SW480 细胞增殖和凋亡的调控作用;miR-126 mimic 显著降低SW480 细胞划痕愈合率和穿膜细胞数（均P<0.01）、抑制MMP-2 和MMP-9 的表达（P<0.01）;pc-Notch2 显著减弱miR-126 mimic 对SW480 细胞迁移、侵袭及MMP-2、MMP-9表达的抑制作用（均P<0.01）。结论：miR-126-5p 通过抑制Notch2 表达,降低结肠癌SW480 细胞增殖、迁移和侵袭能力。     

miRNA-26b-3p通过靶向STAT3调控食管鳞状细胞癌细胞的增殖和迁移

目的:观察miR-26b-3p在食管鳞状细胞癌(ESCC)组织中的表达水平及其对ESCC细胞增殖、侵袭和迁移能力的影响,并探讨其分子调控机制.方法:选取河北医科大学第四医院2018年4月1日至2018年12月25日手术切除的ESCC组织及相应癌旁组织各60例,利用qPCR法检测ESCC组织、癌旁组织和ESCC细胞中mi...     

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。     

miR-144-3p靶向调控E2F3抑制膀胱癌T24细胞的增殖与侵袭

目的:探讨miR144-3p在膀胱癌组织及细胞中的表达及其对T24细胞增殖与侵袭的影响.方法:选用2018年2月至2018年12月空军军医大学唐都医院手术切除的36例膀胱癌组织及10例正常膀胱上皮组织标本,以及人膀胱癌细胞株T24和正常尿路上皮细胞株SV-HUC-1,用qPCR法检测膀胱癌组织和细胞中miR144-3p...     

miR-92b-3p acts as a tumor suppressor by targeting Gabra3 in pancreatic cancer

Background

MicroRNAs (miRNAs) can act as oncogenes or tumor suppressors by controlling cell proliferation, differentiation, metastasis and apoptosis, and miRNA dysregulation is involved in the development of pancreatic cancer (PC). Our previous study demonstrated that Gabra3 plays critical roles in cancer progression. However, whether Gabra3 is regulated by miRNAs in PC remains unknown.

Methods

The expression levels of miR-92b-3p and Gabra3 were measured by quantitative PCR (qPCR), immunoblotting, in situ hybridization (ISH) and immunohistochemistry (IHC). The proliferation rate of PC cells was detected by MTS assay. Wound-healing and transwell assays were used to examine the invasive abilities of PC cells. Dual-luciferase reporter assays were used to determine how miR-92b-3p regulates Gabra3. Xenograft mouse models were used to assess the role of miR-92b-3p in PC tumor formation in vivo.

Results

Here, we provide evidence that miR-92b-3p acted as a tumor suppressor in PC by regulating Gabra3 expression. MiR-92b-3p expression levels were lower in PC tissues than corresponding noncancerous pancreatic (CNP) tissues and were associated with a poor prognosis in PC patients. MiR-92b-3p overexpression suppressed the proliferation and invasion of PC cells in both in vivo and in vitro models. Conversely, miR-92b-3p knockdown induced an aggressive phenotype in PC cells. Mechanistically, miR-92b-3p overexpression suppressed Gabra3 expression, which then led to the inactivation of important oncogenic pathways, including the AKT/mTOR and JNK pathways.

Conclusion

Our results suggest that miR-92b-3p acted as a tumor suppressor by targeting Gabra3-associated oncogenic pathways; these results provide novel insight into future treatments for PC patients.

     

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-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...