MicroRNA-490-5p is a novel tumor suppressor targeting c-FOS in human bladder cancer

Introduction

Recent studies have demonstrated the critical roles of micro-RNAs in tumorigenesis and tumor progression. Here, we describe the regulation and function of miR-490-5p in bladder cancer.

Material and methods

Paired tissue samples were collected from bladder cancer patients (n = 20). Real-time PCR revealed that miR-490-5p expression was significantly down-regulated in human bladder cancer tissues and cells. Also there was an inverse relationship between the expression level of miR-490-5p and the pathological grade of bladder cancer. Western blotting was performed to detect the expression levels of c-FOS and TET1 in 6 matched tumor tissue samples and 4 bladder cell lines. Furthermore, to better understand the underlying mechanisms of miR-490-5p, we conducted gain and loss of function analysis by transfecting bladder cancer T24 cells with chemically synthesized miR-490-5p mimics and inhibitor, respectively.

Results

We found that overexpression of miR-490-5p in T24 cells could inhibit cell proliferation and invasion and induce cell apoptosis. Conversely, suppression of miR-490-5p expression induced cell proliferation and invasion, while it inhibited cell apoptosis. In addition, our bioinformatics prediction and experimental data showed that c-FOS was a potential target of miR-490-5p. The expression level of c-FOS was significantly decreased after miR-490-5p overexpression and significantly increased after miR-490-5p suppression, indicating that c-FOS was a target of miR-490-5p.

Conclusions

These findings suggest that miR-490-5p is a novel tumor suppressor, contributing to the carcinogenesis of bladder cancer by targeting c-FOS.     

Retracted: MiR-141-3p Suppresses Tumor Growth and Metastasis in Papillary Thyroid Cancer via Targeting Yin Yang 1

MicroR-141-3p has been found to be downregulated in papillary thyroid carcinoma (PTC), while little is known about the cellular functions and precise signals elicited by miR-141-3p in PTC. The results of this study indicated that the expression of miR-141-3p was aberrantly down-regulated in PTC tissues and cell lines, compared with the adjacent normal tissues and normal thyroid epithelial cells. Furthermore, the miR-141-3p expression level was negatively associated with TNM stage and lymph node metastasis in PTC. Expression of miR-141-3p effectively inhibited cell growth, promoted apoptosis, and suppressed invasion in PTC cells. Meanwhile, miR-141-3p knockdown with miR-141-3p inhibitor reversed these effects. Consistent with the in vitro study, miR-141-3p also exhibited anti-neoplastic activity in vivo. Moreover, the results revealed that miR-141-3p directly recognized the 3′ untranslated region (3′UTR) of Yin Yang 1 (YY1) and negatively regulated the expression of YY1 at both protein and mRNA levels. Ectopic expression of YY1 could effectively abrogate the anti-metastatic and proapoptotic effects of miR-141-3p. In summary, the findings suggested that miR-141-3p can act as a tumor suppressor in PTC and may be a potential therapeutic target for PTC treatment. Anat Rec, 302:258–268, 2019. © 2018 Wiley Periodicals, Inc.     

MiR-337-3p suppresses migration and invasion of breast cancer cells by downregulating ESRP1

Breast cancer (BC) is a common malignant tumor in women, and a considerable number of studies show that aberrant expression of miRNA is correlated with BC development. By analyzing TCGA-BRCA database through bioinformatics method, this study disclosed that miR-337−3p was significantly low in BC tissue and might be a cancer inhibitor in BC. To explore the effect and potential mechanism of miR-337−3p in BC, qRT-PCR was used in this study to indicate that the expression of miR-337−3p was downregulated in BC cells. Then, the effects of miR-337−3p on BC cells were detected by western blot, Cell Counting Kit-8 (CCK-8), wound healing and Transwell assays. After upregulating miR-337−3p expression, the cell viability, migration, invasion and epithelial-mesenchymal transition (EMT) of BC cells were markedly inhibited while cell apoptosis remarkably increased. Besides, it was predicted and identified by bioinformatics analysis and dual-luciferase assay that ESRP1 was a target gene of miR-337−3p. Finally, the progression and EMT of BC cells were promoted after upregulating ESRP1 expression level. However, upregulating miR-337−3p as well as ESRP1 reduced the promotion on the malignant phenotype of BC cells. This result revealed that miR-337−3p could inhibit ESRP1 expression to perform its biological functions. In conclusion, it was illustrated in this study that miR-337−3p is a tumor-inhibitor of BC and plays its regulatory role via its downstream gene ESRP1.     

Expression and function of microRNA-188-5p in activated rheumatoid arthritis synovial fibroblasts

Activated synovial fibroblasts in rheumatoid arthritis (RASF) play a critical role in the pathology of rheumatoid arthritis (RA). Recent studies suggested that deregulation of microRNAs (miRs) affects the development and progression of RA. Therefore, we aimed to identify de-regulated miRs in RASF and to identify target genes that may contribute to the aggressive phenotype of RASF. Quantitative real-time PCR revealed a marked downregulation of miR-188-5p in synovial tissue samples of RA patients as well as in RASF. Exposure to the cytokine interleukine-1β lead to a further downregulation of miR-188-5p expression levels compared to control cells. Re-expression of miR-188-5p in RASF by transient transfection significantly inhibited cell migration. However, miR-188-5p re-expression had no effects on glycosaminoglycan degradation or expression of repellent factors, which have been previously shown to affect the invasive behavior of RASF. In search for target genes of miR-188-5p in RASF we performed gene expression profiling in RASF and found a strong regulatory effect of miR-188-5p on the hyaluronan binding protein KIAA1199 as well as collagens COL1A1 and COL12A1, which was confirmed by qRT-PCR. In silico analysis revealed that KIAA1199 carries a 3’UTR binding site for miR-188-5p. COL1A1 and COL12A1 showed no binding site in the mRNA region, suggesting an indirect regulation of these two genes by miR-188-5p. In summary, our study showed that miR-188-5p is down-regulated in RA in vitro and in vivo, most likely triggered by an inflammatory environment. MiR-188-5p expression is correlated to the activation state of RASF and inhibits migration of these cells. Furthermore, miR-188-5p is directly and indirectly regulating the expression of genes, which may play a role in extracellular matrix formation and destruction in RA. Herewith, this study identified potential novel therapeutic targets to inhibit the development and progression of RA.     

Expression and function of microRNA-188-5p in activated rheumatoid arthritis synovial fibroblasts

Activated synovial fibroblasts in rheumatoid arthritis (RASF) play a critical role in the pathology of rheumatoid arthritis (RA). Recent studies suggested that deregulation of microRNAs (miRs) affects the development and progression of RA. Therefore, we aimed to identify de-regulated miRs in RASF and to identify target genes that may contribute to the aggressive phenotype of RASF. Quantitative real-time PCR revealed a marked downregulation of miR-188-5p in synovial tissue samples of RA patients as well as in RASF. Exposure to the cytokine interleukine-1β lead to a further downregulation of miR-188-5p expression levels compared to control cells. Re-expression of miR-188-5p in RASF by transient transfection significantly inhibited cell migration. However, miR-188-5p re-expression had no effects on glycosaminoglycan degradation or expression of repellent factors, which have been previously shown to affect the invasive behavior of RASF. In search for target genes of miR-188-5p in RASF we performed gene expression profiling in RASF and found a strong regulatory effect of miR-188-5p on the hyaluronan binding protein KIAA1199 as well as collagens COL1A1 and COL12A1, which was confirmed by qRT-PCR. In silico analysis revealed that KIAA1199 carries a 3’UTR binding site for miR-188-5p. COL1A1and COL12A1 showed no binding site in the mRNA region, suggesting an indirect regulation of these two genes by miR-188-5p. In summary, our study showed that miR-188-5p is down-regulated in RA in vitro and in vivo, most likely triggered by an inflammatory environment. MiR-188-5p expression is correlated to the activation state of RASF and inhibits migration of these cells. Furthermore, miR-188-5p is directly and indirectly regulating the expression of genes, which may play a role in extracellular matrix formation and destruction in RA. Herewith, this study identified potential novel therapeutic targets to inhibit the development and progression of RA.     

miR-506-3p通过靶向MTDH增加前列腺癌细胞的化学敏感性

目的研究miR-506-3p对前列腺癌细胞化学敏感性的影响及其作用机制。方法用RT-qPCR检测miR-506-3p和MTDH在前列腺癌细胞系和正常前列腺细胞系中的表达水平;以紫杉醇为诱导药物构建人前列腺癌耐药细胞株PC-3/PTX,将PC-3/PTX细胞随机分为5组对照组、NC mimic组、miR-506-3p mimic组、LV-MTDH组、mimic+MTDH组,利用Lipofectamine 3000转染试剂盒分别转染对应质粒。检测其存活率、IC50值、克隆细胞数目、凋亡率以及凋亡相关蛋白的表达水平;构建MTDH野生型(WT)和突变型(MUT),用双荧光素酶报告基因实验验证miR-506-3p与MTDH之间的靶向关系;Western blot检测miR-506-3p mimic处理后PC-3/PTX细胞中MTDH的蛋白表达水平。结果miR-506-3p在前列腺癌细胞中低表达,而MTDH高表达;miR-506-3p在PC-3/PTX细胞中的表达量显著低于在前列腺癌细胞PC-3中的表达量;相比于对照组和NC mimic组,miR-506-3p mimic组的PC-3/PTX细胞的存活率、IC50值、克隆细胞数目及Bcl-2表达明显降低,凋亡率及Bax表达明显升高;MTDH野生型较突变型能使荧光素酶活性显著下降;miR-506-3p mimic组PC-3/PTX细胞中MTDH蛋白表达水平显著低于对照组和NC mimic组;相比于对照组,miR-506-3p mimic组中PC-3/PTX细胞克隆数目显著减少,凋亡率升高,而LV-MTDH组与之相反;相比于LV-MTDH组,mimic+MTDH组PC-3/PTX细胞中MTDH的表达量显著下降,细胞克隆数目减少,凋亡率升高。结论miR-506-3p通过靶向抑制MTDH的表达能增强人前列腺癌耐药细胞株PC-3/PTX的化学敏感性。     

miR-188-3p靶向YAP1抑制肝细胞癌的侵袭和迁移

目的 探究miR-188-3p在肝细胞癌(hepatocellular carcinoma,HCC)中的表达及其抑制HCC细胞侵袭和迁移的分子机制.方法 利用RT-qPCR检测miR-188-3p在人HCC组织和细胞系中的表达情况,进一步分析miR-188-3p表达在HCC中的临床价值;利用Western印迹检测转染m...     

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-141-3p promotes proliferation and metastasis of nasopharyngeal carcinoma by targeting NME1

PurposeThis study aimed to investigate the expression and biological function of miR-141-3p in nasopharyngeal carcinoma (NPC) via targeting neoplasm metastasis 1 (NME1).Materials and methodsThe expression of miR-141-3p and NME1 in 5-8F, C666-1, CNE-1, CNE-2, 6-10B and NP69 nasopharyngeal epithelial cells were detected using real-time Polymerase Chain Reaction (real-time PCR) and western blot, respectively. Cell proliferation was detected using Cell Counting Kit-8 (CCK-8), and the metastasis was detected using Transwell. The binding of miR-141-3p to NME1 was detected by dual luciferase reporter gene detection system. The effects of miR-141-3p on tumor growth were also determined in vivo.ResultsThe results showed that the expression of miR-141-3p significantly increased in various tumor cell lines and the expression of NME1 was higher in NP69 cells and lower in 5-8F cells, which had significant negative correlation. Furthermore, the expression of NME1 was significantly reduced after transfection of miR-141-3p and miR-141-3p promoted cell proliferation and metastasis. The double luciferase reporter gene detection system confirmed that NME1 was the target gene of miR-141-3p. Knockout of NME1 promoted the proliferation and metastasis of NP69 or 6-10B cells and the activation of p-Akt, which were abrogated by miR-141-3p. In vivo, the tumor volumes and weights in the miR-141-3p group significantly increased followed by down-regulation of NME1 and activation of p-Akt.ConclusionsWe confirmed that miR-141-3p promotes the proliferation and metastasis of NPC by targeting NME1.     

MiR-873-5p inhibits cell migration,invasion and epithelial-mesenchymal transition in colorectal cancer via targeting ZEB1

Recent studies have demonstrated that dysregulation of mircoRNAs (miRNAs) greatly affected biological processes of human cancers, including colorectal cancer. As a member of miRNAs family, miR-873-5p has been proved to be a tumor suppressor in some human cancers. Here, we aim to investigate the effects of miR-873-5p on the migration, invasion and epithelial-mesenchymal transition (EMT) of colorectal cancer cells. The low expression of miR-873-5p in colorectal cancer cells was identified by conducting qRT-PCR analysis. Gain of function assays were designed and conducted to demonstrate the specific function of miR-873-5p overexpression in colorectal cancer progression. Transwell assay and western blot assay were conducted and revealed that miR-873-5p inhibited cell migration, invasion and EMT formation. To find the downstream molecular mechanism of miR-873-5p, mechanism assays were designed and performed to find the downstream target of miR-873-5p. ZEB1 (Zinc finger E-box-binding homeobox 1) was certified to be the target of miR-873-5p through bioinformatics analysis, luciferase activity assay and pull-down assay. Finally, rescue assays were carried out to demonstrate the effects of miR-873-5p-ZEB1 axis on the migration, invasion and EMT process of colorectal cancer cells. In conclusion, we confirmed that miR-873-5p suppressed cell migration, invasion and EMT in colorectal cancer via targeting ZEB1.     

miR-338-3p inhibits the proliferation and migration of gastric cancer cells by targeting ADAM17

Background: MicroRNAs (miRNA) have been documented playing a critical role in cancer progression. Although miR-338-3p has been implicated in several cancers, its role in gastric cancer is still unknown. The aim of our study was to investigate the role of miR-338-3p in gastric cancer progression. Methods: Expression levels of miR-338-3p in gastric cancer cell lines and tissues were determined by quantitative real-time PCR (qRT-PCR). The effect of miR-338-3p on proliferation was evaluated by MTT assay, cell migration and invasion were evaluated by transwell migration and invasion assays. Furthermore, luciferase reporter assay was conducted to confirm the target gene of miR-338-3p, and the results were validated in gastric cancer cells. Results: In the present study, we found that miR-338-3p was down-regulated in both gastric cancer cell lines and tissues. Enforced expression of miR-338-3p inhibited proliferation, migration and invasion of gastric cancer cells in vitro. Moreover, we identified A disintegrin and metalloproteinase 17 (ADAM17) gene as potential target of miR-338-3p. Importantly, ADAM17 rescued the miR-338-3p mediated inhibition of cell proliferation, migration and invasion. Conclusions: Our study suggested that miR-338-3p is significantly decreased in gastric cancer, and inhibits cell proliferation, migration and invasion partially via the downregulation of ADAM17. Thus, miR-338-3p may represent a potential therapeutic target for gastric cancer intervention.     

miR-145-5p靶向TPM3通过ERK信号通路抑制甲状腺癌TPC-1细胞侵袭和转移

目的 探讨miR-145-5p对甲状腺癌细胞侵袭和转移的影响.方法 将miR-145-5p mimic质粒、mimic-NC质粒、TPM3质粒分别或联合转入甲状腺癌细胞,RT-qPCR检测miR-145-5p与TPM3 mRNA的表达,双荧光素酶报告检测靶向关系,Transwell法检测细胞侵袭能力,划痕实验检测细胞迁...     

Cyclic RNA Circ_0000735 sponges miR-502-5p to promote bladder cancer cell proliferation and invasion and inhibit apoptosis

Objective: The objective of this study was to investigate the effect on the proliferation, invasion, and apoptosis of bladder cancer cells through miR-502-5p of the Circ_0000735 circular RNA. Methods: Circ_0000735 and miR-502-5p expression of bladder cancer patients in malignant and paracancerous tissues was identified using qRT-PCR. Nucleoplasm isolation assay and RNase R enzymatic assay were used to classify Circ_0000735 subcellular origin and stability. Dual luciferase reporter assay and RIP assay were used to confirm Circ_0000735 and miR-502-5p targeting relationships. Cell proliferation, apoptosis, and invasion capacity were identified using CCK8, flow cytometry, and transwell assays. To confirm the effect of Circ_0000735 on tumorigenesis in nude mice, in vivo experiments were conducted. Results: Circ_0000735 expression was increased in bladder cancer tissues and cells compared with paraneoplastic tissues and normal cells, and miR-502-5p expression was reduced (both P<0.05). In the cytoplasm, Circ_0000735 was largely clustered and could not be digested by the RNase R enzyme, and ceRNA may play a role in bladder cancer cells. Circ_0000735 silencing prevented cell proliferation and invasion and facilitated apoptosis (all P<0.05). The incorporation of miR-502-5p inhibitor rescued the effect on bladder cancer cells of Circ_0000735 silencing. In vitro experiments showed that inhibition of Circ_0000735 expression was beneficial in suppressing tumorigenic ability in nude mice. Conclusion: Circ_0000735 can adsorb miR-502-5p to promote bladder cancer cell proliferation and invasion and inhibit apoptosis. Circ_0000735 may be an effective molecular target for bladder cancer therapy.     

miR-141-3p对卵巢癌的作用及其机制

目的:探究miR-141-3p在卵巢癌中的作用及其相关的分子机制.方法:实时荧光定量PCR检测30例卵巢囊肿和30例卵巢癌组织中miR-141-3p和表皮生长因子受体(EGFR)的表达水平.将SKOV3细胞分为NC组(无转染的SKOV3细胞),miR-141-3p组(SKOV3细胞转染miR-141-3p),LV-EG...     

MiR-124-3p suppresses glioma aggressiveness via targeting of Fra-2

Malignant glioma is the most common and deadly primary brain tumor in adults. However, the mechanisms underlying the malignancy of glioma remain unclear. In the present study, we found that Fos-related antigen-2 (Fra-2) was overexpressed in most glioma cells, and knockdown of Fra-2 prevented cell proliferation, migration, and invasion. Mechanistically, Fra-2 silencing led to a significant reduction in cell-cycle drivers (Cyclin D1 and Cyclin E1), one invasion-associated gene (MMP9), the mesenchymal marker (Vimentin), and induction of the epithelial marker (E-cadherin). Further study confirmed that miR-124-3p decreased the expression of Fra-2 via directly targeting the 3′-UTR, and transfection with miR-124-3p in glioma cells inhibited expression of the above cell-cycle and EMT promoters. Phenotypic experiments also showed that overexpression of Fra-2 weakened the inhibitory effects of miR-124-3p on the proliferation, migration, and invasion of glioma cells. In addition, Fra-2 knockdown impaired the malignant phenotypes enhanced by miR-124-3p inhibition, which suggested a crucial role for the miR-124-3p/Fra-2 pathway in glioma development. Consistently, high expression of Fra-2 was closely associated with low miR-124-3p level and indicated a poor prognosis in patients with glioma. In conclusion, this study indicates the existence of an aberrant miR-124-3p/Fra-2 pathway that results in glioma aggressiveness, which suggests novel therapeutic opportunities for this fatal disease.     

MiR-876-5p acts as an inhibitor in hepatocellular carcinoma progression by targeting DNMT3A

Hepatocellular carcinoma (HCC) is one of the biggest challenges that human beings faced with in 21st century. Previous researches have revealed that miRNAs can serve as regulators in various cancers. MiR-876-5p, a member of miRNA family, has been studied in lung cancer for its anti-oncogenic function. However, the exact function of it is not reported in HCC. Our study aims to find out the effects of miR-876-5p expression on HCC progression. Two HCC cells were chosen to do functional assays after miR-876-5p expression was detected in cell lines by qRT-PCR. HepG2 cell was transfected with miR-876-5p mimics, whereas LM3 cell was transfected with miR-876-5p inhibitors. Next, cell activities of these two indicated cells were analyzed by means of MTT assay, colony forming assay, transwell migration assay and western blot analysis. Consequently, we found that miR-876-5p could inhibit both cell proliferation and metastasis. Moreover, we found out a target gene (DNMT3A) of miR-876-5p by performing bioinformatics analysis, dual luciferase reporter assay and biotin-avidin pull-down assay. Finally, rescue assays were carried out in HepG2 cells. We found that DNMT3A could reverse miR-876-5p mimics-induced inhibition. Therefore, we concluded that miR-876-5p suppressed hepatocellular carcinoma progression by targeting DNMT3A.     

miR-145-5p suppresses proliferation,metastasis and EMT of colorectal cancer by targeting CDCA3

MicroRNAs play a critical role in regulating the carcinogenesis of colorectal cancer (CRC). Even though its role is unclear in CRC, miR-145-5p has been reported to have anti-oncogene properties in several tumors. Our research examined the function of miR-145-5p in CRC and the potential underlying mechanism. From the bioinformatics and qRT-PCR analysis, miR-145-5p levels were lower in CRC samples and cell lines. LoVo and SW480 cells were treated with miR-145-5p mimics and inhibitor, respectively. Cell cycle, CCK-8 and EdU assays revealed that overexpression of miR-145-5p suppressed cell viability and G1/S phase transition. Conversely, miR-145-5p inhibitor promoted cell growth and cell cycle transition. Elevated miR-145-5p expression also suppressed the migration, invasion and EMT of CRC cells, while miR-145-5p reduction had a reverse effect. CDCA3 was identified as a downstream effector of miR-145-5p and had a negative correlation with the miR-145-5p expression in CRC. In addition, co-transfection of miR-145-5p inhibitor and si-CDCA3 showed that CDCA3 in SW480 cells could reverse the effect caused by miR-145-5p. In conclusion, our findings demonstrated that miR-145-5p could act as a tumor suppressor in CRC by targeting CDCA3, and serve as a diagnostic and therapeutic biomarker of CRC.     

Retracted: Alpinumisoflavone Inhibits Tumor Growth and Metastasis in Papillary Thyroid Cancer via Upregulating miR-141-3p

Alpinumisoflavone (AIF) as a principal active ingredient of traditional Chinese herb Derris eriocarpa exerts a broad spectrum of anticancer activities against solid tumors. However, little is known about the effect of AIF on papillary thyroid cancer (PTC). Objectives of this study are to investigate the effect of AIF on cell growth, apoptosis, and metastasis of PTC cells and uncover its underlying mechanisms. Results showed that AIF treatment notably suppressed cell viability, migration, invasion, and epithelial–mesenchymal transition (EMT) process, as well as induced apoptotic cell death. In addition, microarray analysis results revealed that miR-141-3p level was dramatically elevated upon AIF insulation, suggesting that miR-141-3p may mediate the suppressive role of AIF against PTC. Moreover, miR-141-3p knockdown effectively reversed the effects of AIF on cell growth, migration, invasion, and EMT, while promoted PTC cell apoptosis escape. Furthermore, in vivo findings also confirmed that the antigrowth and antimetastasis activities of AIF were, at least partly, mediated by upregulation of miR-141-3p. Overall, AIF could serve as a potential anticancer compound for PTC treatment. Anat Rec, 2019. © 2019 American Association for Anatomy Anat Rec, 303:1842–1850, 2020. © 2019 American Association for Anatomy     

MiR-21-5p,miR-34a,and human telomerase RNA component as surrogate markers for cervical cancer progression

Objective

This study aimed to demonstrate the predictive value of miR-21-5p, miR-34a, and human telomerase RNA component (hTERC) in cervical cancer (CC) development and evaluated their potential possibility for future clinical applications.