circ_0000989通过调控miR-183-5p/LRP6轴促进视网膜母细胞瘤细胞增殖、迁移和侵袭

目的:探究环状RNA circ_0000989在视网膜母细胞瘤(retinoblastoma,RB)中的表达情况,及其对RB细胞功能的影响和调控机制。方法:采用实时荧光定量聚合酶链反应（qRT-PCR）检测RB组织和细胞中circ_0000989的表达水平。采用CCK-8和Transwell检测circ_0000989过表达质粒和miR-183-5p mimics对细胞增殖、迁移和侵袭的影响。采用Western blot检测circ_0000989和miR-183-5p对LRP6表达水平的影响。采用双荧光素酶报告基因分析circ_0000989对miR-183-5p的调控。结果:RB组织和细胞中circ_0000989表达显著上调。circ_0000989可以显著促进RB细胞的增殖、迁移和侵袭;而miR-183-5p可减弱此作用。双荧光素酶报告基因和Western blot显示circ_0000989通过吸附miR-183-5p促进LRP6的表达。结论:circ_0000989通过调控miR-183-5p/LRP6轴促进RB细胞增殖、迁移和侵袭,为临床RB患者的诊断和治疗提供了潜在的分子靶点。     

Saponin from Platycodi radix inactivates PI3K/AKT signaling pathway to hinder colorectal cancer cell proliferation,invasion, and migration through miR-181c/d-5p/RBM47

Colorectal cancer (CRC) is the third frequent cancer and second leading reason of cancer-related mortality all over the globe. Saponins from Platycodi radix (SPR) and microRNAs (miRNAs) have been reported to regulate CRC cell progression. Real-time quantitative polymerase chain reaction (RT-qPCR) detected miR-181c-5p, miR-181d-5p, and RBM47 expression level. Cell counting kit-8 (CCK-8), 5-ethynyl-20-deoxyuridine (EdU), colony formation, transwell, and wound healing assays validated that miR-181c-5p and miR-181d-5p promote CRC cell proliferation, migration and invasion and SPR exerts opposite effects. Cignal Finder Reporter Array and western blot proved that the activity of PI3K/AKT pathway was decreased by RBM47 overexpression. RNA pulldown, luciferase reporter, and RNA-binding protein immunoprecipitation (RIP) assays proved the interaction between miR-181c/d-5p and RBM47, and RBM47 and PTEN. Rescue experiments were carried out to validate that RBM47 reverses the influence of miR-181c/d-5p on the progression of CRC cells. The stability of PTEN was probed by real-time quantitative polymerase chain reaction in CRC cells treated with Actinomycin D (Act D). To be concluded, SPR inactivates PI3K/AKT signaling pathway to suppress CRC cell proliferation, invasion, and migration via miR-181c/d-5p/RBM47. Elucidating the mechanisms of SPR underlying CRC may offer novel insight into CRC treatment.     

miR-145-5p靶向TAGLN2调控结直肠癌SW620细胞侵袭和迁移的机制探讨

目的:探究微小RNA-145-5p（miR-145-5p）在结直肠癌组织和细胞中的表达情况及其靶向调控肌动蛋白凝胶蛋白2（TAGLN2）对结直肠癌细胞侵袭和迁移能力的影响。方法:采用实时荧光定量PCR（qPCR）技术对48例结直肠癌患者癌组织、配对癌旁组织、结直肠癌细胞株（HCT8、SW620、HCT116、HT-29）及结直肠黏膜细胞FHC中的miR-145-5p和TAGLN2 mRNA表达进行定量分析。将SW620细胞设为空白对照组、miR-145-5p mimics组、mimics-NC组、pcDNA3.1-TAGLN2组、pcDNA3.1-Vector组和miR-145-5p mimics+pcDNA3.1-TAGLN2组,采用qPCR检测miR-145-5p和TAGLN2 mRNA表达,采用Transwell法检测细胞侵袭及迁移能力,采用免疫印迹法（Western blot）检测TAGLN2蛋白及EMT相关蛋白表达,采用双荧光素酶报告实验检测miR-145-5p和TAGLN2间的靶向关系。结果:miR-145-5p在结直肠癌组织中的表达水平显著低于癌旁组织（P<0.05）,并与结直肠癌患者的TNM分期和淋巴结转移相关（均P<0.05）;TAGLN2在结直肠癌组织中的表达水平显著高于癌旁组织,并与miR-145-5p表达呈负相关（P<0.05）;miR-145-5p和TAGLN2在结直肠癌HCT8、SW620、HCT116和HT-29细胞中的表达水平显著低于或高于FHC细胞（均P<0.05）。miR-145-5p过表达可降低SW620细胞的侵袭和迁移能力。miR-145-5p靶向调控TAGLN2表达,单独转染TAGLN2阳性质粒可增加SW620细胞的侵袭和迁移能力,与miR-145-5p mimics同时转染后,TAGLN2蛋白、波形蛋白（Vimentin）和神经钙黏素（N-cadherin）表达降低,上皮钙黏素（E-cadherin）表达升高,TAGLN2对SW620细胞侵袭和迁移能力的增强作用被显著抑制。结论:miR-145-5p在结直肠癌中呈低表达状态,其表达水平与结直肠癌患者的TNM分期和淋巴结转移密切相关,miR-145-5p靶向调控TAGLN2抑制结直肠癌细胞的侵袭和迁移能力。     

circ＿0000615通过靶向miR-432-5p调控胆管癌细胞的增殖、迁移和侵袭

目的:探讨circ＿0000615在胆管癌细胞中的表达及其对胆管癌细胞增殖、迁移和侵袭能力的影响和可能的调控机制。方法:通过qPCR检测circ＿0000615在正常胆管上皮HIBEC细胞和胆管癌CCLP-1、QBC939、TFK-1和RBE细胞中的表达水平。双荧光素酶报告基因实验验证circ＿0000615与miR-432-5p的靶向关系。将si-NC、si-circ＿0000615(si-circ-1、si-circ-2)、inhibitor-NC和inhibitor-miR-432-5p转染至CCLP-1和QBC939细胞,转染细胞分为si-NC组、si-circ-1组、si-circ-2组、si-NC+inh-NC组、si-NC+inh-miR-432-5p组和si-circ-1+inh-miR-432-5p组,通过CCK-8、EdU和Transwell实验检测各转染组胆管癌细胞的增殖、迁移和侵袭能力。结果:在胆管癌细胞中circ＿0000615呈高表达而miR-432-5p呈低表达(P<0.05或P<0.01);双荧光素酶报告基因实验证实circ＿0000615与...     

m6A修饰的circ_100367通过调控miR-885-5p轴介导甲状腺乳头状癌免疫逃逸

目的:探讨m6A修饰的circ_100367对甲状腺乳头状癌（papillary thyroid carcinoma,PTC）免疫逃逸的影响,并阐述其可能的机制。方法:采用qRT-PCR法检测PTC患者癌组织及其癌细胞株中circ_100367和miR-885-5p的表达水平。将circ_100367干扰质粒（si-circ_100367）及其阴性对照干扰质粒（si-NC）、circ_100367过表达质粒（oe-circ_100367）及其阴性对照质粒（oe-NC）和miR-885-5p mimics及其阴性对照NC mimics分别转染至TPC1细胞中,分为Blank组、si-circ_100367组、si-NC组、oe-circ_100367组、oe-NC组、miR-885-5p mimics组和NC mimics组。采用qRT-PCR法检测各组TPC1细胞中circ_100367和miR-885-5p的表达水平;采用双荧光素酶报告系统验证circ_100367可靶向调控miR-885-5p;MeRIP-qPCR法检测circ_100367的m6A甲基化水平;Transwell法检测细胞侵袭能力;细胞划痕实验检测细胞迁移能力;Western blot检测细胞FASL、IDO1、PD-L2和PD-L1表达水平。结果:circ_100367在PTC患者癌组织及其癌细胞株K1、TPC1和IHH4中表达水平明显升高（P＜0.05）,而miR-885-5p表达水平明显降低（P＜0.05）。双荧光素酶报告系统结果说明:circ_100367靶向负调控miR-885-5p。MeRIP试验结果显示:circ_100367含有丰富的m6A甲基化,且与NC mimics比较,miR-885-5p mimics细胞中circ_100367的m6A甲基化水平明显降低（P<0.05）。此外,与Blank或si-NC比较,si-circ_100367细胞侵袭数量、细胞划痕愈合率和FASL、PD-L1、PD-L2、IDO1蛋白表达水平明显降低（P<0.05）;与Blank或oe-NC比较,oe-circ_100367细胞侵袭数量、细胞划痕愈合率和FASL、PD-L1、PD-L2、IDO1蛋白表达水平明显升高（P<0.05）;与Blank或NC mimics比较,miR-885-5p mimics细胞侵袭数量、细胞划痕愈合率和FASL、PD-L1、PD-L2、IDO1蛋白表达水平明显降低（P<0.05）。结论:m6A甲基化修饰的circ_100367能诱导PTC细胞侵袭,影响PD-L1的表达进而促进免疫逃逸,其可能与 m6A甲基化修饰的circ_100367和miR-885-5p竞争性结合有关。     

LncRNA SNHG5 affects cell proliferation,metastasis and migration of colorectal cancer through regulating miR-132-3p/CREB5

We aimed at the effects of long non-coding RNA (lncRNA) SNHG5 on proliferation, metastasis and migration of colorectal cancer (CRC) cells. We also investigated regulatory relationships among miR-132-3p, SNHG5 and CREB5 and their roles in CRC. 25 pairs of samples containing CRC tissues and matched para-tumor tissues were obtained to examine SNHG5, miR-132-3p and CREB5 expression by qRT-PCR or Western blot. The targeted relationship between miR-132-3p and SNHG5 or CREB5 was confirmed by dual luciferase report assay as well as RNA pull down assay. The expression of SNHG5, miR-132-3p and CREB5 in CRC cells were regulated by cell transfection. CRC cellular proliferation was assayed by CCK-8 and meanwhile flow cytometry was adopted to observe apoptosis. Metastasis and migration of CRC cells were determined respectively by means of Transwell assay and scratch test. The effects of SNHG5 on CRC were researched in vivo, too. SNHG5 or CREB5 was up-regulated in CRC tissues and cells, whereas miR-132-3p was down-regulated. Overexpression of SNHG5 and CREB5 resulted in the enhancement of proliferation, metastasis, migration and the inhibition of apoptosis in CRC cells, while miR-132-3p led to the opposite result. LncRNA SNHG5 promoted proliferation, migration and metastasis of CRC cells but inhibited apoptosis by modulating miR-132-3p/CERB5.     

MicroRNA-499-5p promotes cellular invasion and tumor metastasis in colorectal cancer by targeting FOXO4 and PDCD4

MicroRNAs (miRNAs) regulate tumor progression and invasion via direct interaction with target messenger RNAs (mRNAs). We defined miRNAs involved in cancer metastasis (metastamirs) using an established in vitro colorectal cancer (CRC) model of minimally metastatic cells (SW480 line) from a colon adenocarcinoma primary lesion and highly metastatic cells (SW620 line) from a metastatic lymph node from the same patient 1 year later. We used microarray analysis to identify miRNAs differentially expressed in SW480 and SW620 cells, focusing on miR-499-5p as a novel candidate prometastatic miRNA whose functions in cancer had not been studied. We confirmed increased miR-499-5p levels in highly invasive CRC cell lines and lymph node-positive CRC specimens. Furthermore, enhancing the expression of miR-499-5p promoted CRC cell migration and invasion in vitro and lung and liver metastasis in vivo, while silencing its expression resulted in reduced migration and invasion. Additionally, we identified FOXO4 and PDCD4 as direct and functional targets of miR-499-5p. Collectively, these findings suggested that miR-499-5p promoted metastasis of CRC cells and may be useful as a new potential therapeutic target for CRC.     

MiR-150-5p Suppresses Colorectal Cancer Cell Migration and Invasion through Targeting MUC4

Growing evidence suggests that miR-150-5p has an important role in regulating genesis of various types of cancer. However, the roles and the underlying mechanisms of miR-150-5p in development of colorectal cancer (CRC) remain largely unknown. Transwell chambers were used to analyze effects on cell migration and invasion by miR-150-5p. Quantitative real-time PCR (qRT-PCR), Western blotting and dual-luciferase 3’ UTR reporter assay were carried out to identify the target genes of miR-150-5p. In our research, miR-150-5p suppressed CRC cell migration and invasion, and MUC4 was identified as a direct target gene. Its effects were partly blocked by re-expression of MUC4. In conclusiomn, miR-150-5p may suppress CRC metastasis through directly targeting MUC4, highlighting its potential as a novel agent for the treatment of CRC metastasis.     

miR-106b-5p靶向调控细胞周期蛋白D1抑制结直肠癌细胞增殖、迁移与侵袭

目的:探讨miR-106b-5p对结直肠癌(colorectal cancer,CRC)细胞增殖、迁移与侵袭的影响以及其作用机制.方法:实时荧光定量PCR检测miR-106b-5p在CRC组织与相应的癌旁组织、永生化的肠上皮细胞以及肠癌细胞中的表达量;CCK8实验检测DLD1细胞增殖能力;细胞划痕实验检测DLD1细胞的...     

The SOX17/miR-371-5p/SOX2 axis inhibits EMT,stem cell properties and metastasis in colorectal cancer

Cancer stem cells (CSCs) and EMT-type cells, which share molecular characteristics with CSCs, have been believed to play critical roles in tumor metastasis. Although much progress has been garnered in elucidating the molecular pathways that trigger EMT, stemness and metastasis, a number of key mechanistic gaps remain elusive. In the study, miR-371-5p was obviously down-regulated in primary CRC tissues compared with matched adjacent normal mucosa and correlated significantly with differentiation, tumor size, lymphatic and liver metastases. MiR-371-5p could attenuate proliferation, invasion in vitro and metastasis in vivo in CRC cells. It also suppressed EMT by regulating Wnt/β-catenin signaling and strongly decreased the CRC stemness phenotypes. Moreover, demethylation of SOX17 induced miR-371-5p expression and consequently suppressed its direct target SOX2 in CRC cells. MiR-371-5p was necessary for SOX17 mediated cancer-related traits and SOX2 was a functional target of miR-371-5p. A positive relationship between SOX17 and miR-371-5p expression and a negative one between miR-371-5p and SOX2 expression were observed in CRC cell lines and tissues. In conclusion, we identified miR-371-5p as an important “oncosuppressor” in CRC progression and elucidated a novel mechanism of the SOX17/miR-371-5p/SOX2 axis in the regulation of EMT, stemness and metastasis, which may be a potential therapeutic target.     

Circular RNA 0001666 inhibits colorectal cancer cell proliferation,invasion and stemness by inactivating the Wnt/β-catenin signaling pathway and targeting microRNA-1229

A previous bioinformatics study suggested that circular RNA 0001666 (circ_0001666) and its target microRNA (miR)-1229 were associated with colorectal cancer (CRC) pathogenesis. However, the role of this interaction in the regulation of CRC cell malignancy remains unclear. Thus, the aim of the present study was to examine the interaction between circ_0001666 and miR-1229, and its effects on CRC cell malignancy. circ_0001666 overexpression or knockdown plasmids were transfected into the HT-29 and HCT-116 cell lines. In addition, in rescue experiments, circ_000166 or miR-1229 overexpression plasmids were transfected into the HT-29 cell line, either alone or in combination. Following transfection, cell proliferation, apoptosis, invasion and the number of CD133⁺ cells were analyzed. The protein expression level of proteins in the Wnt/β-catenin pathway was also examined. In both HT-29 and HCT-116 cell lines, circ_0001666 overexpression increased apoptosis, whilst inhibiting cell proliferation and invasion, and reducing the frequency of CD133⁺ cells. By contrast, circ_0001666 knockdown reduced apoptosis, but increased cell proliferation and the number of CD133⁺ cells. However, cell invasion remained unaffected. In addition, circ_0001666 expression levels negatively regulated those of miR-1229, whereas miR-1229 expression did not affect circ_0001666, in both the HT-29 and HCT-116 cell lines. Furthermore, a luciferase reporter assay confirmed that miR-1229 directly bound to circ_0001666. In the HT-29 cell line, miR-1229 overexpression activated the Wnt/β-catenin pathway, and promoted cell proliferation, invasion and stemness, while suppressing cell apoptosis. In addition, miR-1229 overexpression reversed the effects of circ_0001666 overexpression. In conclusion, circ_0001666 suppresses CRC cell proliferation, invasion and stemness by inhibiting the Wnt/β-catenin signaling pathway by targeting miR-1229, and may represent a potential target for CRC treatment.     

外泌体中circ_0044366调控肿瘤相关成纤维细胞MMP2的表达促进结直肠癌转移的机制研究

背景与目的:结直肠癌(colorectal cancer,CRC)是全球癌症死亡的主要原因之一,大量研究发现,环状RNA(circular RNA,circRNA)作为miRNA分子海绵参与CRC细胞的增殖、迁移、侵袭和凋亡等病理生理学过程,circRNA/miRNA/靶基因/靶蛋白轴可能是CRC发生的重要原因之一.探...     

Circ_0001777 Affects Triple-negative Breast Cancer Progression Through the miR-95-3p/AKAP12 Axis

BackgroundTriple Negative Breast Cancer (TNBC) is 1 of the most serious cancer. Circular RNA_0001777 (circ_0001777) expression was decreased in TNBC tissues. However, the molecular mechanism of circ_0001777 remains unknown.MethodsThe expression of circ_0001777, microRNA-95-3p (miR-95-3p) and A-kinase anchor protein 12 (AKAP12) were detected by quantitative real-time fluorescence polymerase chain reaction (qRT-PCR). A series of in vitro experiments were designed to explore the function of circ_0001777 in TNBC cells and the regulatory mechanism between circ_0001777 and miR-95-3p and AKAP12 in TNBC cells. Western blot examined the relative protein levels in TNBC cells. Bioinformatics prediction site predicted the relationship between miR-95-3p and circ_0001777 or AKAP12 and was verified by Dual-luciferase reporter assays. The xenotransplantation model was established to study the role of circ_0001777 in vivo.ResultsThe expression of circ_0001777 and AKAP12 was decreased in TNBC tissues, while the expression of miR-95-3p was increased. Circ_0001777 can sponge miR-95-3p, and AKAP12 is the target of miR-95-3p. In vitro complement experiments, overexpression of circ_0001777 significantly decreased the malignant behavior of TNBC, while co-transfection of miR-95-3p partially up-regulated this change. In addition, AKAP12 knockdown increased the proliferation, migration, and invasion of TNBC cells inhibited by overexpression of circ_0001777. Mechanically, circ_0001777 regulates AKAP12 expression in TNBC cells by sponge miR-95-3p. In addition, in vivo studies have shown that overexpression of circ_0001777 inhibits tumor growth.ConclusionOverexpression of circ_0001777 decreased proliferation, migration, and invasion of TNBC cells by regulating the miR-95-3p/AKAP12 axis, suggesting that circ_0001777/miR-95-3p/AKAP12 axis may be a potential regulatory mechanism for the treatment of TNBC.     

circ_0072088通过调控miR-532-3p/WEE1轴促进甲状腺癌IHH4细胞的恶性生物学行为

目的:探讨circ_0072088对甲状腺癌IHH4细胞恶性生物学行为的影响及其可能的机制.方法:选取2015年4月至2019年3月于青海大学附属医院就诊的确诊为甲状腺癌后接受切除手术且术前未进行任何治疗的48例甲状腺癌患者的甲状腺癌组织及其对应癌旁组织.根据GEO数据集(GSE93522)分析鉴定甲状腺乳头状癌中差异...     

Circ_0007429/miR-637/TRIM71/Ago2 axis participates in the regulation of proliferation,migration, invasion,apoptosis, and aerobic glycolysis of HCC

CircRNAs play an important role in the progression of hepatocellular carcinoma (HCC), however, the role of circ_0007429 in HCC remains unknown. Using bioinformatics tools, we selected circ_0007429 that was most highly expressed in HCC tissues and investigated its role in HCC progression. Immunohistochemistry, plasmid transfection, real-time quantitative PCR, and western blot analysis were used to identify the relationship between circ_0007429 and its potential target, miR-637, and TRIM71. The regulatory effect of circ_0007429 on miR-637/TRIM71/Ago2 signaling and its key role in HCC progression were studied in vitro. A nude mouse xenograft model was used to examine tumor growth in vivo. Circ_0007429 and TRIM71 expression were upregulated, while miR-637 expression was downregulated in HCC tissues and cells compared with their expression in control groups. Knockdown of circ_0007429 enhanced apoptosis in HCC cells, while impeded proliferation, migration, invasion, and aerobic glycolysis, which were reversed by miR-637 inhibitor. High levels of circ_0007429 correlated with a poor survival rate of HCC patients. Additionally, circ_0007429 interfering inhibited tumor growth in vivo. TRIM71 directly bound to miR-637 and inhibited Ago2 expression. Moreover, circ_0007429 promotes aerobic glycolysis in HCC cells through the miR/TRIM71/Ago2 axis. Circ_0007429 promotes HCC progression by promoting cell proliferation, migration, invasion, and aerobic glycolysis and by inhibiting cell apoptosis through the miR/TRIM71/Ago2 axis. These results provide molecular insights into the mechanism of HCC and suggest that circ_0007429 could be a therapeutic target for HCC.