1
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He J, Yu K, Liang G, Shen W, Tian H. circ_0000592 facilitates the progression of esophageal squamous cell carcinoma via miR-155-5p/FZD5 axis. J Biochem Mol Toxicol 2024; 38:e23742. [PMID: 38780005 DOI: 10.1002/jbt.23742] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2023] [Revised: 03/10/2024] [Accepted: 05/09/2024] [Indexed: 05/25/2024]
Abstract
Esophageal squamous cell carcinoma (ESCC) is one of the gastrointestinal malignancies with high prevalence and poor prognosis. Previous reports suggested that circular ribose nucleic acids might exert regulatory functions in ESCC. This study aims to explore the role of circ_0000592 in ESCC progression, providing novel insights into the diagnosis and therapeutic avenues for ESCC. The GSE131969 data set was utilized to assess circ_0000592 expression in ESCC. The validation was performed in the tumorous tissues of ESCC patients (n = 80) and human-immortalized ESCC cell lines. The correlation between circ_0000592 expression and prognosis was analyzed. The impact of circ_0000592 on ESCC cell activity was evaluated through downregulating circ_0000592, as well as encompassing cell viability, migration, and invasion abilities. The downstream pathway of circ_0000592 was explored by binding site prediction from the TargetScan database, followed by in vitro and in vivo experiments. An in vivo xenograft tumor model was established to highlight the role of circ_0000592 in ESCC. Patients with ESCC exhibited higher circ_0000592 expression levels compared to noncancerous patients, which were associated with reduced survival time, higher TNM stage, and increased lymph node metastasis. The circ_0000592 downregulation suppressed cell viability, migration, and invasion abilities in vitro. Mechanistically, circ_0000592 countered the inhibitory effects on the target gene Frizzled 5 (FZD5) through interactions with miR-155-5p. The overexpression of miR-155-5p curtailed the luciferase activity of circ_0000592 in ESCC cells, inhibiting downstream molecule FZD5 protein expression and subsequently mitigating the detrimental consequences of escalated circ_0000592 expression in ESCC cells. Consistently, circ_0000592 downregulation curbed proliferation and metastasis of ESCC tumors in vivo. In summary, circ_0000592 promoted the progress of ESCC by counteracting the inhibitory impact on FZD5 through its interaction with miR-155-5p. Together, our findings highlighted circ_0000592 as a prospective therapeutic target for ESCC.
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Affiliation(s)
- Jinxian He
- Department of Thoracic Surgery, Ningbo Medical Center Lihuili Hospital, Ningbo, Zhejiang, China
| | - Kaizhong Yu
- Department of Thoracic Surgery, Ningbo Medical Center Lihuili Hospital, Ningbo, Zhejiang, China
| | - Gaofeng Liang
- Department of Thoracic Surgery, Ningbo Medical Center Lihuili Hospital, Ningbo, Zhejiang, China
| | - Weiyu Shen
- Department of Thoracic Surgery, Ningbo Medical Center Lihuili Hospital, Ningbo, Zhejiang, China
| | - Hui Tian
- Department of Thoracic Surgery, Ningbo Medical Center Lihuili Hospital, Ningbo, Zhejiang, China
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2
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Zhao YX, Yu CQ, Li LP, Wang DW, Song HF, Wei Y. BJLD-CMI: a predictive circRNA-miRNA interactions model combining multi-angle feature information. Front Genet 2024; 15:1399810. [PMID: 38798699 PMCID: PMC11116695 DOI: 10.3389/fgene.2024.1399810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2024] [Accepted: 04/03/2024] [Indexed: 05/29/2024] Open
Abstract
Increasing research findings suggest that circular RNA (circRNA) exerts a crucial function in the pathogenesis of complex human diseases by binding to miRNA. Identifying their potential interactions is of paramount importance for the diagnosis and treatment of diseases. However, long cycles, small scales, and time-consuming processes characterize previous biological wet experiments. Consequently, the use of an efficient computational model to forecast the interactions between circRNA and miRNA is gradually becoming mainstream. In this study, we present a new prediction model named BJLD-CMI. The model extracts circRNA sequence features and miRNA sequence features by applying Jaccard and Bert's method and organically integrates them to obtain CMI attribute features, and then uses the graph embedding method Line to extract CMI behavioral features based on the known circRNA-miRNA correlation graph information. And then we predict the potential circRNA-miRNA interactions by fusing the multi-angle feature information such as attribute and behavior through Autoencoder in Autoencoder Networks. BJLD-CMI attained 94.95% and 90.69% of the area under the ROC curve on the CMI-9589 and CMI-9905 datasets. When compared with existing models, the results indicate that BJLD-CMI exhibits the best overall competence. During the case study experiment, we conducted a PubMed literature search to confirm that out of the top 10 predicted CMIs, seven pairs did indeed exist. These results suggest that BJLD-CMI is an effective method for predicting interactions between circRNAs and miRNAs. It provides a valuable candidate for biological wet experiments and can reduce the burden of researchers.
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Affiliation(s)
- Yi-Xin Zhao
- School of information Engineering, Xijing University, Xi’an, China
| | - Chang-Qing Yu
- School of information Engineering, Xijing University, Xi’an, China
| | - Li-Ping Li
- School of information Engineering, Xijing University, Xi’an, China
- College of Grassland and Environment Sciences, Xinjiang Agricultural University, Ürümqi, China
| | - Deng-Wu Wang
- School of information Engineering, Xijing University, Xi’an, China
| | - Hui-Fan Song
- School of information Engineering, Xijing University, Xi’an, China
| | - Yu Wei
- School of information Engineering, Xijing University, Xi’an, China
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3
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Liu P, Yang F, Zhang L, Hu Y, Chen B, Wang J, Su L, Wu M, Chen W. Emerging role of different DNA methyltransferases in the pathogenesis of cancer. Front Pharmacol 2022; 13:958146. [PMID: 36091786 PMCID: PMC9453300 DOI: 10.3389/fphar.2022.958146] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Accepted: 07/26/2022] [Indexed: 11/18/2022] Open
Abstract
DNA methylation is one of the most essential epigenetic mechanisms to regulate gene expression. DNA methyltransferases (DNMTs) play a vital role in DNA methylation in the genome. In mammals, DNMTs act with some elements to regulate the dynamic DNA methylation patterns of embryonic and adult cells. Conversely, the aberrant function of DNMTs is frequently the hallmark in judging cancer, including total hypomethylation and partial hypermethylation of tumor suppressor genes (TSGs), which improve the malignancy of tumors, aggravate the ailment for patients, and significantly exacerbate the difficulty of cancer therapy. Since DNA methylation is reversible, currently, DNMTs are viewed as an important epigenetic target for drug development. However, the impression of DNMTs on cancers is still controversial, and therapeutic methods targeting DNMTs remain under exploration. This review mainly summarizes the relationship between the main DNMTs and cancers as well as regulatory mechanisms and clinical applications of DNMTs in cancer and highlights several forthcoming strategies for targeting DNMTs.
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Affiliation(s)
- Pengcheng Liu
- Department of Human Resources, The First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Fan Yang
- The First Clinical Medical College, Anhui Medical University, Hefei, China
| | - Lizhi Zhang
- The First Clinical Medical College, Anhui Medical University, Hefei, China
| | - Ying Hu
- Inflammation and Immune Mediated Diseases Laboratory of Anhui Province, School of Pharmacy, Anhui Medical University, Hefei, China
| | - Bangjie Chen
- Department of Oncology, The First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Jianpeng Wang
- The First Clinical Medical College, Anhui Medical University, Hefei, China
| | - Lei Su
- Department of Oncology, The First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Mingyue Wu
- Department of Oncology, The First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Wenjian Chen
- Department of Orthopaedics, Anhui Provincial Children’s Hospital, Hefei, China
- *Correspondence: Wenjian Chen,
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4
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Xia G, Wang A, Li L. hsa_circ_0000218/hsa-miR-139-3p/SOX4 regulatory feedback circuit influences the proliferation and apoptosis of gastric cancer cells. Cytotechnology 2022; 74:89-98. [PMID: 35185288 PMCID: PMC8816988 DOI: 10.1007/s10616-021-00509-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2021] [Accepted: 11/13/2021] [Indexed: 02/03/2023] Open
Abstract
Previous studies have reported that circular (circ)RNAs serve an important role in cancer progression, but the effects of hsa_circRNA_0000218 (circ_0000218) and its potential underlying mechanism in gastric cancer (GC) are not completely understood. In the present study, dual luciferase reporter and RNA pull down assays were performed to detect the relationship between microRNA (miR)-139-3p and circ_0000218, and reverse transcription-quantitative polymerase chain reaction (RT-qPCR) was used to detect circ_0000218, miR-139-3p and SRY-box transcription factor 4 (SOX4) mRNA expression levels in GC and GES-1 cells. 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2-H-tetrazolium bromide (MTT) assay and flow cytometry were used to detect cell proliferation and apoptosis, respectively. Western blotting was performed to assess cleaved-Caspase3 and Caspase3 expression levels in GC cells. circ_0000218 and SOX4 were highly expressed, whereas miR-139-3p was lowly expressed in GC cells. Moreover, circ_0000218 negatively regulated miR-139-3p in GC cells. circ_0000218 knockdown inhibited GC cell proliferation, promoted apoptosis and enhanced cleaved-Caspase3 expression in GC cells, whereas miR-139-3p knockdown reversed these effects. miR-139-3p overexpression inhibited proliferation and induced apoptosis in GC cells, but these effects were reversed by SOX4 overexpression. Collectively, the present study demonstrated that circ_0000218 upregulated SOX4 via downregulating miR-139-3p to promote GC progression.
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Affiliation(s)
- Ganlin Xia
- Department of Gastrointestinal Surgery, Wuhan Puren Hospital, Wuhan, 430080 China
| | - Anxin Wang
- Department of Gastrointestinal Surgery, Wuhan Puren Hospital, Wuhan, 430080 China
| | - Liangxue Li
- Department of Vascular Surgery, Wuhan Puren Hospital, No. 1 Benxi Street, Qingshan District, Wuhan, 430080 China
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5
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Ji Z, Diao W, Shang J. Circular RNA circ_0000592 elevates ANXA4 expression via sponging miR-1179 to facilitate tumor progression in gastric cancer. Anticancer Drugs 2022; 33:e644-e654. [PMID: 34459457 DOI: 10.1097/cad.0000000000001216] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Increasing evidence indicated that dysregulated circular RNAs were implicated in the progression of multiple malignancies. However, the function of circ_0000592 in gastric cancer (GC) progression and its associated mechanism remain poorly understood. Quantitative real-time PCR and Western blot assay were performed to detect RNA and protein expression. Cell proliferation, migration and invasion were analyzed by 5-Ethynyl-2'-deoxyuridine staining assay, Transwell migration assay and Transwell invasion assay, respectively. The glucose/lactate assay kit was used to assess the rates of glucose consumption and lactate production. The interaction between microRNA-1179 (miR-1179) and circ_0000592 or Annexin A4 (ANXA4) was confirmed by dual-luciferase reporter assay and RNA pull-down assay. Xenograft tumor model was established to investigate the effect of circ_0000592 on tumor growth in vivo. Circ_0000592 expression was elevated in GC tissues and cells. Circ_0000592 knockdown hampered cell proliferation, migration, invasion and glycolysis of GC cells. MiR-1179 was a direct target of circ_0000592, and circ_0000592 silencing-mediated effects in GC cells were partly reversed by the knockdown of miR-1179. MiR-1179 interacted with the 3' untranslated region (3'UTR) of ANXA4. Circ_0000592 silencing reduced ANXA4 expression partly by upregulating miR-1179 in GC cells. ANXA4 overexpression partly overturned circ_0000592 knockdown-induced effects in GC cells. Circ_0000592 depletion markedly suppressed xenograft tumor growth in vivo. Circ_0000592 contributed to GC progression through regulating miR-1179/ANXA4 axis, which provided novel potential biomarkers and therapeutic targets for GC treatment.
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Affiliation(s)
| | | | - Jincai Shang
- General Surgical, First Affiliated Hospital of Jiamusi University, Jiamusi, Heilongjiang, China
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6
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Ghafouri-Fard S, Honarmand Tamizkar K, Jamali E, Taheri M, Ayatollahi SA. Contribution of circRNAs in gastric cancer. Pathol Res Pract 2021; 227:153640. [PMID: 34624593 DOI: 10.1016/j.prp.2021.153640] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 09/22/2021] [Accepted: 09/27/2021] [Indexed: 12/13/2022]
Abstract
Gastric cancer (GC) is one of the most commonly diagnosed neoplasms in the world. A number of environmental and lifestyle factors, particularly chronic infection with Helicobacter pylori, have been found to partake in the pathogenesis of GC. The advent of high-throughput genome and transcriptome analysis has enhanced the knowledge about molecular mechanisms of the pathogenesis of GC. However, data regarding the expression of several circRNAs, such as circLMTK2, are not consistent. We explain the role of circRNAs in the development of GC. We searched databases for the newest publications using the terms gastric cancer and circRNA. Each circRNA alteration, downstream targets, its impacts on cancer cells, and the prognostic and diagnostic roles of these circRNAs have been discussed. Taken together, circRNAs can be putative biomarkers in GC and potential targets for the treatment of this cancer. Yet, this field is still in its infancy and needs further experiments for reaching the clinical application. As these transcripts are stable in circulation, they can be used in non-invasive methods of cancer detection and patients' follow-up.
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Affiliation(s)
- Soudeh Ghafouri-Fard
- Department of Medical Genetics, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Kasra Honarmand Tamizkar
- Men's Health and Reproductive Health Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Elena Jamali
- Department of Pathology, Loghman Hakim Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mohammad Taheri
- Skull Base Research Center, Loghman Hakim Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
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7
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Liu Y, He D, Xiao M, Zhu Y, Zhou J, Cao K. Long noncoding RNA LINC00518 induces radioresistance by regulating glycolysis through an miR-33a-3p/HIF-1α negative feedback loop in melanoma. Cell Death Dis 2021; 12:245. [PMID: 33664256 PMCID: PMC7933330 DOI: 10.1038/s41419-021-03523-z] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2020] [Revised: 02/07/2021] [Accepted: 02/09/2021] [Indexed: 01/31/2023]
Abstract
The long noncoding RNA, LINC00518, is highly expressed in various types of cancers and is involved in cancer progression. Although LINC00518 promotes the metastasis of cutaneous malignant melanoma (CMM), the mechanism underlaying its effects on CMM radiosensitivity remains unclear. In this study, LINC00518 expression was significantly upregulated in CMM samples, and LINC00518 levels were associated with poor prognosis of patients with CMM. Knockdown of LINC00518 in CMM cells significantly inhibited cell invasion, migration, proliferation, and clonogenicity. LINC00518-mediated invasion, migration, proliferation, and clonogenicity were negatively regulated by the microRNA, miR-33a-3p, in vitro, which increased sensitivity to radiotherapy via inhibition of the hypoxia-inducible factor 1α (HIF-1α)/lactate dehydrogenase A glycolysis axis. Additionally, HIF-1α recognized the miR-33a-3p promoter region and recruited histone deacetylase 2, which decreased the expression of miR-33a-3p and formed an LINC00518/miR-33a-3p/HIF-1α negative feedback loop. Furthermore, signaling with initially activated glycolysis and radioresistance in CMM cells was impaired by Santacruzamate A, a histone deacetylase inhibitor, and 2-deoxy-D-glucose, a glycolytic inhibitor. Lastly, knockdown of LINC00518 expression sensitized CMM cancer cells to radiotherapy in an in vivo subcutaneously implanted tumor model. In conclusion, LINC00518 was confirmed to be an oncogene in CMM, which induces radioresistance by regulating glycolysis through an miR-33a-3p/HIF-1α negative feedback loop. Our study, may provide a potential strategy to improve the treatment outcome of radiotherapy in CMM.
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MESH Headings
- Animals
- Cell Line, Tumor
- Cell Movement
- Cell Proliferation
- Databases, Genetic
- Feedback, Physiological
- Gene Expression Regulation, Neoplastic
- Glycolysis
- Humans
- Hypoxia-Inducible Factor 1, alpha Subunit/genetics
- Hypoxia-Inducible Factor 1, alpha Subunit/metabolism
- Male
- Melanoma/genetics
- Melanoma/metabolism
- Melanoma/pathology
- Melanoma/radiotherapy
- Mice, Inbred BALB C
- Mice, Nude
- MicroRNAs/genetics
- MicroRNAs/metabolism
- Neoplasm Invasiveness
- RNA, Long Noncoding/genetics
- RNA, Long Noncoding/metabolism
- Radiation Tolerance
- Signal Transduction
- Skin Neoplasms/genetics
- Skin Neoplasms/metabolism
- Skin Neoplasms/pathology
- Skin Neoplasms/radiotherapy
- Tumor Hypoxia
- Tumor Microenvironment
- Xenograft Model Antitumor Assays
- Mice
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Affiliation(s)
- Yan Liu
- Department of Oncology, Third Xiangya Hospital, Central South University, Changsha, 410013, Hunan, PR China
- Department of Plastic Surgery, Third Xiangya Hospital, Central South University, Changsha, 410013, PR China
| | - Dong He
- Department of Respiration, the Second People's Hospital of Hunan Province of Hunan University of Chinese Medicine, Changsha, 410000, PR China
| | - Mengqing Xiao
- Department of Oncology, Third Xiangya Hospital, Central South University, Changsha, 410013, Hunan, PR China
| | - Yuxing Zhu
- Department of Oncology, Third Xiangya Hospital, Central South University, Changsha, 410013, Hunan, PR China
| | - Jianda Zhou
- Department of Plastic Surgery, Third Xiangya Hospital, Central South University, Changsha, 410013, PR China
| | - Ke Cao
- Department of Oncology, Third Xiangya Hospital, Central South University, Changsha, 410013, Hunan, PR China.
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8
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Wang X, Zhu Y. Circ_0000020 elevates the expression of PIK3CA and facilitates the malignant phenotypes of glioma cells via targeting miR-142-5p. Cancer Cell Int 2021; 21:79. [PMID: 33509213 PMCID: PMC7841906 DOI: 10.1186/s12935-021-01767-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Accepted: 01/10/2021] [Indexed: 02/01/2023] Open
Abstract
BACKGROUND Multiple circular RNAs (circRNAs) have been recently described as crucial oncogenic factors or tumor suppressors. This study aimed to investigate the role of circ_0000020 in glioma progression. METHODS Circ_0000020 and miR-142-5p expressions in glioma samples were assessed through qRT-PCR, and then the association between pathological indexes and circ_0000020 expressions was analyzed. Functional experiment was performed with human glioma cell lines U251 and U87. Gain-of-function and loss-of-function models were established. CCK-8 assay was used to detect glioma cell proliferation. Transwell assay was used to examine glioma cell migration and invasion. The regulatory relationships among circ_0000020, miR-142-5p and phosphatidylinositol 3-kinase C (PIK3CA) were investigated by bioinformatics analysis, luciferase reporter assay, qRT-PCR and Western blot. In vivo tumorigenesis assay was performed with nude mice to further validate the demonstrations of in vitro experiments. RESULTS Circ_0000020 expression in glioma samples was remarkably increased compared with that in normal brain tissues and its high expression was associated with unfavorable pathological indexes. Circ_0000020 overexpression remarkably accelerated proliferation, migration and invasion of glioma cells. Accordingly, circ_0000020 knockdown suppressed the malignant phenotypes of glioma cells. Circ_0000020 overexpression significantly reduced miR-142-5p expression by sponging it, and circ_0000020 could enhance the expression of PIK3CA, which was a target gene of miR-142-5p. CONCLUSIONS Circ_0000020 promotes glioma progression via miR-142-5p/PIK3CA axis.
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Affiliation(s)
- Xu Wang
- Department of Neurosurgery, Xiangyang Central Hospital, Affiliated Hospital of Hubei University of Arts and Science, Jingzhou Street No. 136, Xiangyang, 441021, Hubei, China
| | - Yaozu Zhu
- Department of Neurosurgery, Xiangyang Central Hospital, Affiliated Hospital of Hubei University of Arts and Science, Jingzhou Street No. 136, Xiangyang, 441021, Hubei, China.
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9
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Exosomal circRNAs: A new star in cancer. Life Sci 2021; 269:119039. [PMID: 33454367 DOI: 10.1016/j.lfs.2021.119039] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Revised: 12/20/2020] [Accepted: 01/01/2021] [Indexed: 12/13/2022]
Abstract
As a disease that seriously endangers human health, cancer still lacks effective treatment because of its complicated mechanism of action. Currently, an emerging class of RNAs, named circular RNAs (circRNAs), has been found to be closely related to cancer. CircRNAs have a stable closed loop structure which would be hardly degraded in blood or body fluids. Exosomes are found naturally in a variety of cells, mediating cell-to-cell communication, or participating in multiple processes of tumor development. Researchers have found that abnormally expressed circRNAs may be associated with the occurrence and development of malignancies. As a kind of exosome-derived non-coding RNAs, exosomal circRNAs have also played important roles in cancer progression and acted as diagnostic and prognostic biomarkers for cancer, and thus arousing more and more attention. This article reviews the functions, mechanisms and values of the exosomal circRNAs in tumors in order to provide new ideas and novel biomarkers for the diagnosis and treatment of cancer.
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10
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Niu Q, Dong Z, Liang M, Luo Y, Lin H, Lin M, Zhong X, Yao W, Weng J, Zhou X. Circular RNA hsa_circ_0001829 promotes gastric cancer progression through miR-155-5p/SMAD2 axis. JOURNAL OF EXPERIMENTAL & CLINICAL CANCER RESEARCH : CR 2020; 39:280. [PMID: 33308284 PMCID: PMC7731483 DOI: 10.1186/s13046-020-01790-w] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Accepted: 11/25/2020] [Indexed: 02/08/2023]
Abstract
Background Accumulating evidences have shown that circular RNAs (circRNAs) play important roles in regulating the pathogenesis of cancer. However, the role of circRNAs in gastric cancer (GC) remains largely unclear. Methods In this study, we identified a novel upregulated circRNA, hsa_circ_0001829, in chemically induced malignant transformed human gastric epithelial cells using RNA-seq. Subsequent qRT-PCR and ISH assays were performed to detect the expression level of hsa_circ_0001829 in GC cell lines and tissues. Functional roles of hsa_circ_0001829 in GC were then explored by loss- and gain-of- function assays. Bioinformatic prediction and luciferase assay were used to investigate potential mechanisms of hsa_circ_0001829. Finally, the mice xenograft and metastasis models were constructed to assess the function of hsa_circ_0001829 in vivo. Results We found that hsa_circ_0001829 was significantly upregulated in GC tissues and cell lines. Loss- and gain-of- function assays showed that hsa_circ_0001829 promotes GC cells proliferation, migration and invasion, and the affected cell cycle progression and apoptosis rates may account for the effect of hsa_circ_0001829 on GC proliferation. In addition, bioinformatic prediction and luciferase assay showed that hsa_circ_0001829 acts as a molecular sponge for miR-155-5p and that SMAD2 was a target gene of miR-155-5p; moreover, hsa_circ_0001829 sponges miR-155-5p to regulate SMAD2 expression and hsa_circ_0001829 promotes GC progression through the miR-155-5p–SMAD2 pathway. Finally, suppression of hsa_circ_0001829 expression inhibited tumor growth and aggressiveness in vivo. Conclusion Taken together, our findings firstly demonstrated a novel oncogenic role of hsa_circ_0001829 in GC progression through miR-155-5p–SMAD2 axis, and our study may offer novel biomarkers and therapeutic targets for GC. Supplementary Information The online version contains supplementary material available at 10.1186/s13046-020-01790-w.
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Affiliation(s)
- Qiuling Niu
- The Fifth Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou, China
| | - Zhijie Dong
- The Fifth Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou, China
| | - Min Liang
- The Fifth Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou, China
| | - Yuanwei Luo
- The Fifth Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou, China
| | - Hai Lin
- The Fifth Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou, China
| | - Mingzhen Lin
- The Fifth Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou, China
| | - Xiu Zhong
- The Fifth Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou, China
| | - Wenxia Yao
- The Fifth Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou, China.
| | - Jinsheng Weng
- The Fifth Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou, China.
| | - Xinke Zhou
- The Fifth Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou, China.
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11
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Wu W, Zhen T, Yu J, Yang Q. Circular RNAs as New Regulators in Gastric Cancer: Diagnosis and Cancer Therapy. Front Oncol 2020; 10:1526. [PMID: 33072546 PMCID: PMC7531269 DOI: 10.3389/fonc.2020.01526] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Accepted: 07/16/2020] [Indexed: 12/14/2022] Open
Abstract
Gastric cancer (GC) is one of the most commonly diagnosed cancers that causes high mortality in the world. Although the surgery tools and chemotherapies have significantly improved the overall survival of patients with GC, the early diagnosis of GC remains insufficient and many patients diagnosed with advanced stages of GC are not able to benefit from curative therapy. Circular RNAs (circRNAs), novel members of the non-coding cancer genome, are being explored with regards to various cancer types including GC. CircRNAs could work as miRNA sponges to regulate cell proliferation, cell migration, and cell cycle in GC. In addition, it was found that abnormal expression of circRNAs was associated with pathological characteristics in GC tissues, which could help to act as potential markers of early diagnosis or predictors of prognosis. Although various functional circRNAs have been discovered and characterized, the studies of circRNAs in GC are still at early stages compared with other RNAs. In order to provide a whole view to better understand the circRNAs in the occurrence and development of GC, we review the current knowledge on circRNAs in relation to their expression and regulation in GC as well as their potential to be diagnosis markers, and their role in drug resistance will be mentioned. It is helpful to address their possibility from basic research into practical application.
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Affiliation(s)
- Wei Wu
- College of Food Science and Engineering, Qingdao Agricultural University, Qingdao, China
- Institute for Translational Medicine, Qingdao University, Qingdao, China
| | - Tianyuan Zhen
- College of Food Science and Engineering, Qingdao Agricultural University, Qingdao, China
| | - Junmin Yu
- Department of Anesthesiology, The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, China
| | - Qingli Yang
- College of Food Science and Engineering, Qingdao Agricultural University, Qingdao, China
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12
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Wang Z, Zhang W, Fang J, Xie P, Miao M, Yang H. Circular RNA circEXOC6B Inhibits the Progression of Ovarian Cancer by Sponging miR-421 and Regulating RUS1 Expression. Onco Targets Ther 2020; 13:8233-8243. [PMID: 32884301 PMCID: PMC7443403 DOI: 10.2147/ott.s243040] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Accepted: 04/09/2020] [Indexed: 12/24/2022] Open
Abstract
Background Evidence has been shown that circular RNAs (circRNAs) play a vital role during the development of ovarian cancer. However, the mechanism by which circEXOC6B regulates tumorigenesis of ovarian cancer remains unknown. Thus, this study aimed to investigate the role of circEXOC6B during the progression of ovarian cancer. Materials and Methods The dual-luciferase reporter system assay was used to determine the interaction between circEXOC6B, miR-421 and RUS1 in ovarian cancer, respectively. CCK8 and colony formatting were used to evaluate cell proliferation. Meanwhile, the expressions of RSU1, PINCH1 and ILK in SKOV3 cells were detected with Western blot. Results Downregulation of circEXOC6B markedly promoted the proliferation and invasion in A2780 cells. In contrast, upregulation of circEXOC6B significantly inhibited the proliferation and invasion in SKOV3 cells. Moreover, overexpression of circEXOC6B obviously induced the apoptosis of SKOV3 cells. Furthermore, luciferase reporter assay identified that miR-421 was the potential miRNA binding of circEXOC6B, and RUS1 was the potential binding target of miR-421. Mechanism analysis indicated that upregulation of circEXOC6B increased the level of RUS1 by acting as a competitive "sponge" of miR-421. Conclusion In this study, we found that circEXOC6B suppressed the growth of ovarian cancer cells through upregulating RSU1 partially via sponging miR-421. Therefore, circEXOC6B might be a potential target for the treatment of ovarian cancer.
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Affiliation(s)
- Zhonghai Wang
- Department of Gynecology, Huazhong University of Science and Technology, Shenzhen, Guangdong 518052, People's Republic of China
| | - Wenmin Zhang
- Women & Children Health Institute Futian Shenzhen, Shenzhen, Guangdong 518017, People's Republic of China
| | - Jinchuan Fang
- Women & Children Health Institute Futian Shenzhen, Shenzhen, Guangdong 518017, People's Republic of China
| | - Ping Xie
- Women & Children Health Institute Futian Shenzhen, Shenzhen, Guangdong 518017, People's Republic of China
| | - Miao Miao
- Women & Children Health Institute Futian Shenzhen, Shenzhen, Guangdong 518017, People's Republic of China
| | - Hongwen Yang
- Women & Children Health Institute Futian Shenzhen, Shenzhen, Guangdong 518017, People's Republic of China
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13
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Wang HY, Wang YP, Zeng X, Zheng Y, Guo QH, Ji R, Zhou YN. Circular RNA is a popular molecule in tumors of the digestive system (Review). Int J Oncol 2020; 57:21-42. [PMID: 32377736 PMCID: PMC7252451 DOI: 10.3892/ijo.2020.5054] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Accepted: 04/06/2020] [Indexed: 02/06/2023] Open
Abstract
Most tumors of the digestive system, including esophageal, gastric, liver and colorectal cancer, are malignant tumors that are associated with rates of high morbidity and mortality. The lack of effective methods for early diagnosis is an important cause of poor prognosis for these malignancies. Circular RNAs (circRNAs) belong to a family of endogenous, covalently closed non‑coding RNAs that are characterized as having no 5' cap structures or 3' poly‑A tails. Shortly following discovery, circRNAs were considered to be a product of mis‑splicing and have no significant biological function. However, in recent years, accumulating evidence is demonstrating that they serve key roles in tumorigenesis and have the potential to serve as diagnostic markers. The present article summarizes the biogenesis and function of circRNAs and reviews their role in seven common types of tumor of the digestive system whilst exploring their potential as tumor markers and the significant roles they can serve in the digestive system, in addition to providing a referencing point for future studies of digestive system malignancies.
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Affiliation(s)
- Hao-Ying Wang
- Department of Gastroenterology
- Key Laboratory for Gastrointestinal Diseases of Gansu Province, The First Hospital of Lanzhou University, Lanzhou, Gansu 730000, P.R. China
| | - Yu-Ping Wang
- Department of Gastroenterology
- Key Laboratory for Gastrointestinal Diseases of Gansu Province, The First Hospital of Lanzhou University, Lanzhou, Gansu 730000, P.R. China
| | - Xi Zeng
- Department of Gastroenterology
- Key Laboratory for Gastrointestinal Diseases of Gansu Province, The First Hospital of Lanzhou University, Lanzhou, Gansu 730000, P.R. China
| | - Ya Zheng
- Department of Gastroenterology
- Key Laboratory for Gastrointestinal Diseases of Gansu Province, The First Hospital of Lanzhou University, Lanzhou, Gansu 730000, P.R. China
| | - Qing-Hong Guo
- Department of Gastroenterology
- Key Laboratory for Gastrointestinal Diseases of Gansu Province, The First Hospital of Lanzhou University, Lanzhou, Gansu 730000, P.R. China
| | - Rui Ji
- Department of Gastroenterology
- Key Laboratory for Gastrointestinal Diseases of Gansu Province, The First Hospital of Lanzhou University, Lanzhou, Gansu 730000, P.R. China
| | - Yong-Ning Zhou
- Department of Gastroenterology
- Key Laboratory for Gastrointestinal Diseases of Gansu Province, The First Hospital of Lanzhou University, Lanzhou, Gansu 730000, P.R. China
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14
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Nie H, Wang Y, Liao Z, Zhou J, Ou C. The function and mechanism of circular RNAs in gastrointestinal tumours. Cell Prolif 2020; 53:e12815. [PMID: 32515024 PMCID: PMC7377939 DOI: 10.1111/cpr.12815] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2020] [Revised: 03/21/2020] [Accepted: 04/04/2020] [Indexed: 12/12/2022] Open
Abstract
Gastrointestinal tumours are tumours that originate in the digestive tract and have extremely high morbidity and mortality. The main categories include: oesophageal, gastric, and colorectal cancers. Circular RNAs are a new class of non‐coding RNAs with a covalent closed‐loop structure without a 5’ cap or a 3’ poly A tail, which can encode a small amount of polypeptide. Recent studies have shown that circRNAs are involved in multiple biological processes during the development of gastrointestinal tumours including proliferation, invasion and metastasis, radio‐ and chemoresistance, and inflammatory responses. Also, the clinical and pathological characteristics of the patient, such as staging and lymph node metastasis, are closely associated with the expression level of circRNAs. Further investigation of the function and the role of circRNAs in the development of gastrointestinal tumours will provide new directions for its clinical diagnosis and treatment.
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Affiliation(s)
- Hui Nie
- Department of Pathology, Xiangya Hospital, Central South University, Changsha, China
| | - Yutong Wang
- Department of Pathology, Xiangya Hospital, Central South University, Changsha, China
| | - Zhiming Liao
- Department of Pathology, Xiangya Hospital, Central South University, Changsha, China.,Department of Pathology, the Fourth Hospital of Changsha, Changsha, China
| | - Jianhua Zhou
- Department of Pathology, Xiangya Hospital, Central South University, Changsha, China
| | - Chunlin Ou
- Department of Pathology, Xiangya Hospital, Central South University, Changsha, China
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15
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Wang Y, Gao R, Li J, Tang S, Li S, Tong Q, Mao Y. Circular RNA hsa_circ_0003141 promotes tumorigenesis of hepatocellular carcinoma via a miR-1827/UBAP2 axis. Aging (Albany NY) 2020; 12:9793-9806. [PMID: 32464601 PMCID: PMC7288939 DOI: 10.18632/aging.103244] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Accepted: 04/17/2020] [Indexed: 02/07/2023]
Abstract
Circular RNAs (circRNAs) play an important role in the tumorigenesis of hepatocellular carcinoma (HCC), but their specific functions in HCC remain largely unknown. Using bioinformatics analysis, we have found that the expression of circRNA hsa_circ_0003141 is significantly increased in HCC tissues. Ubiquitin-associated protein 2 (UBAP2) is the parent gene for hsa_circ_0003141, and its high expression correlates with poor overall survival rates in HCC patients. In addition, our results show that miR-1827 is a binding target of hsa_circ_0003141, and indicate that hsa_circ_0003141 regulates UBAP2 expression by sponging miR-1827 in HCC cells. Downregulation of hsa_circ_0003141 suppresses UBAP2 expression, induces apoptosis, and inhibits proliferation and invasion by HCC Huh-7 cells. Importantly, downregulation of hsa_circ_0003141 inhibits tumorigenesis in a xenograft mouse model of HCC. Together, our results indicate that hsa_circ_0003141 functions as an oncogene in HCC cells, and suggest that the hsa_circ_0003141/miR-1827/UBAP2 axis might represent a novel therapeutic option for the treatment of HCC.
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Affiliation(s)
- Yong Wang
- Department of Pediatric Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, Hubei, P.R. China
| | - Rongfen Gao
- Department of Rheumatology and Immunology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei, P.R. China
| | - Jinpeng Li
- Department of Thyroid and Breast Surgery, Wuhan University Zhongnan Hospital, Wuhan 430071, Hubei, P.R. China
| | - Shaotao Tang
- Department of Pediatric Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, Hubei, P.R. China
| | - Shuai Li
- Department of Pediatric Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, Hubei, P.R. China
| | - Qiangsong Tong
- Department of Pediatric Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, Hubei, P.R. China
| | - Yongzhong Mao
- Department of Pediatric Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, Hubei, P.R. China
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16
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Wang X, Feng H, Dong W, Wang F, Zhang G, Wu J. Hsa_circ_0008225 inhibits tumorigenesis of glioma via sponging miR-890 and promoting ZMYND11 expression. J Pharmacol Sci 2020; 143:74-82. [PMID: 32192854 DOI: 10.1016/j.jphs.2020.02.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Revised: 01/21/2020] [Accepted: 02/03/2020] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND Circular RNAs (circRNAs) play an important role in the tumorigenesis of glioma. Our study indicated that low hsa_circ_0008225 expression was associated with poor overall survival in patients with glioma. However, the relevant mechanism of hsa_circ_0008225 in glioma tumorigenesis remains unclear. METHODS Two datasets (GSE86202 and GSE92322) were downloaded from the Gene Expression Omnibus (GEO) database. The differentially expressed circRNAs (DEcircRNAs) between glioma tissues and matched normal tissues were screened using R language. RESULTS A total of 79 overlapping DEcircRNAs were identified by comparison of glioma and matched normal tissues. In addition, low hsa_circ_0008225 expression was associated with poor overall survival in patients with glioma. Overexpression of hsa_circ_0008225 markedly inhibited the proliferation, migration and invasion of SHG44 cells via inducing apoptosis. Mechanically, overexpression of hsa_circ_0008225 increased the expression of miR-890 targeted gene ZMYND11 via acting as a competitive 'sponge' of miR-890. CONCLUSION Our results suggested that hsa_circ_0008225 functions as a tumor inhibitor in glioma by sponging miR-890 and then promoting the function of ZMYND11. Therefore, hsa_circ_0008225 could be a potential prognostic biomarker for the treatment of glioma.
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Affiliation(s)
- Xiaoliang Wang
- Department of Neurosurgery, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei, 050000, PR China
| | - Hongru Feng
- Department of Physical Examination Center, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei, 050000, PR China
| | - Wei Dong
- Department of Neurosurgery, Zhaoxian People's Hospital, Shijiazhuang, Hebei, 051530, PR China
| | - Feng Wang
- Department of Neurosurgery, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei, 050000, PR China
| | - Gengshen Zhang
- Department of Neurosurgery, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei, 050000, PR China
| | - Jianliang Wu
- Department of Neurosurgery, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei, 050000, PR China.
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17
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Cai X, Nie J, Chen L, Yu F. Circ_0000267 promotes gastric cancer progression via sponging MiR-503-5p and regulating HMGA2 expression. Mol Genet Genomic Med 2019; 8:e1093. [PMID: 31845519 PMCID: PMC7005624 DOI: 10.1002/mgg3.1093] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2019] [Revised: 11/15/2019] [Accepted: 11/20/2019] [Indexed: 12/24/2022] Open
Abstract
Background Circular RNAs (circRNAs) are a class of newly discovered RNAs that attach great importance to modulate gene expression and biological function. Nonetheless, in gastric cancer (GC), the expression and function of circRNA are much less explored. In this study, circ_0000267 expression in GC was investigated and the function and mechanism of circ_0000267 was probed. Materials and Methods Quantitative real‐time PCR (qRT‐PCR) was employed to detect circ_0000267, miR‐503‐5p, and HMGA2 expression. Immunohistochemistry and western blot were adopted to detect HMGA2 and epithelial–mesenchymal transition (EMT)‐related proteins (E‐cadherin and N‐cadherin) expression in GC tissues and cells, respectively. GC cell lines with circ_0000267 overexpressed and knocked down were constructed, and CCK‐8 assay, BrdU assay, scratch healing assay, and transwell assay were employed to assess the effect of circ_0000267 on the proliferation and metastasis of GC cells. Besides, dual‐luciferase reporter gene assay was adopted to verify the targeting relationship between circ_0000267 and miR‐503‐5p. Results Circ_0000267 showed a significant upregulation in GC tissues and cell lines, and its high expression level was extremely linked to the increased tumor diameter and local lymph node metastasis. Circ_0000267 overexpression accelerated GC cell proliferation, metastasis, and EMT processes, while knocking down circ_0000267 led to the opposite effect. From the perspective of mechanism, circ_0000267 promoted the progression of GC through adsorbing miR‐503‐5p and upregulating HMGA2 expression. Conclusion Circ_0000267 is an oncogenic circRNA that affects the progression of GC, which participates in promotion of GC proliferation, migration, invasion, and EMT via modulating the miR‐503‐5p/HMGA2 axis.
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Affiliation(s)
- Xiaopeng Cai
- Department of Gastrointestinal Surgery, Zhongnan Hospital, Wuhan University, Wuhan, Hubei, China.,Hubei Key Laboratory of Tumor Biological Behaviors, Wuhan, Hubei, China.,Hubei Cancer Clinical Study Center, Wuhan, Hubei, China
| | - Jiayan Nie
- Department of Gastroenterology, Zhongnan Hospital, Wuhan University, Wuhan, Hubei, China
| | - Liangdong Chen
- Department of Thyroid and Breast Surgery, Zhongnan Hospital, Wuhan University, Wuhan, Hubei, China
| | - Fang Yu
- Department of Pathology, Zhongnan Hospital, Wuhan University, Wuhan, Hubei, China
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