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Li B, Zhou J, Luo Y, Tao K, Zhang L, Zhao Y, Lin Y, Zeng X, Yu H. Suppressing circ_0008494 inhibits HSCs activation by regulating the miR-185-3p/Col1a1 axis. Front Pharmacol 2022; 13:1050093. [PMID: 36467040 PMCID: PMC9713816 DOI: 10.3389/fphar.2022.1050093] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Accepted: 11/07/2022] [Indexed: 11/22/2023] Open
Abstract
Background: Hepatic fibrosis (HF) is characterized by activation of hepatic stellate cells (HSCs) and extensive deposition of extracellular matrix components, especially collagens. However, effective antifibrotic therapies are still lacking. Recently, circular RNAs (circRNAs) have been identified as novel regulators of HF. Methods: circRNAs profile was screened by RNA sequencing and the location of circ_0008494 was confirmed by fluorescence in situ hybridization assay in human HF tissues. Bioinformatics analysis was used for result prediction and dual-luciferase reporter, together with AGO-RIP and biotin-coupled miRNA capture assays, were used to determine miR-185-3p/collagen type I alpha 1 chain (Col1a1) as the target of circ_0008494. A stable circ_0008494-interfering human HSCs cell line was constructed and used to determine the regulatory mechanism of circ_0008494/miR-185-3p/Col1a1 axis. Results: circ_0008494 was abundantly and significantly over-expressed in human HF tissues and located at the cytoplasm of HSCs. Together, dual-luciferase reporter, AGO-RIP and biotin-coupled miRNA capture assays confirmed that circ_0008494 acted as a sponge of miR-185-3p. Cell functional experiments and rescue assays demonstrated suppressing circ_0008494 could inhibit activation, proliferation, migration of HSCs and promote their apoptosis through miR-185-3p. In particular, the HF indicator, Col1a1, was validated as the direct target of miR-185-3p and the suppression of circ_0008494 inhibited the expression of Col1a1 by releasing miR-185-3p. Conclusion: Knocking down circ_0008494 inhibited HSCs activation through the miR-185-3p/Col1a1 axis. circ_0008494 could be a promising treatment target for HF.
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Affiliation(s)
- Binbin Li
- Department of Pathology, Second Affiliated Hospital of Naval Medical University, Shanghai, China
| | - Jiaming Zhou
- Department of Pathology, Second Affiliated Hospital of Naval Medical University, Shanghai, China
- Department of Pathology, Medical School of Nantong University, Nantong, China
| | - Yuanyuan Luo
- Department of Gastroenterology, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Kegong Tao
- Department of Gastroenterology, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Lifen Zhang
- Department of Pathology, Second Affiliated Hospital of Naval Medical University, Shanghai, China
| | - Ying Zhao
- Department of Traditional Chinese Medicine, Second Affiliated Hospital of Naval Medical University, Shanghai, China
| | - Yong Lin
- Department of Gastroenterology, Second Affiliated Hospital of Naval Medical University, Shanghai, China
| | - Xin Zeng
- Department of Gastroenterology, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Hongyu Yu
- Department of Pathology, Second Affiliated Hospital of Naval Medical University, Shanghai, China
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2
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Li C, Li W, Cao S, Xu J, Qian Y, Pan X, Lei D, Wei D. Circ_0058106 promotes proliferation, metastasis and EMT process by regulating Wnt2b/β-catenin/c-Myc pathway through miR-185-3p in hypopharyngeal squamous cell carcinoma. Cell Death Dis 2021; 12:1063. [PMID: 34750351 PMCID: PMC8575998 DOI: 10.1038/s41419-021-04346-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2021] [Revised: 09/15/2021] [Accepted: 10/08/2021] [Indexed: 12/23/2022]
Abstract
Hypopharyngeal squamous cell carcinoma (HSCC) accounts 95% of hypopharyngeal cancer, which is characterized by high early metastasis rate and poor prognosis. It is reported that circular RNA is involved in the occurrence and development of cancer; however, the role of circRNA in hypopharyngeal cancer has little been investigated. We performed hypopharyngeal carcinoma circRNA microarray and qRT-PCR verification. The results showed circ_0058106 expression level was significantly upregulated in tumor tissues than in corresponding normal tissues. We found that circ_0058106 upregulation promoted proliferation, migration and invasion of HSCC cells, while knockdown of circ_0058106 inhibited proliferation, migration and invasion of HSCC cells both in vitro and in vivo. Bioinformatics predicted circ_0058106 may interact with miR-185-3p. We verified circ_0058106 directly bound miR-185-3p and downregulated miR-185-3p expression by using dual-luciferase reporter assay and qRT-PCR. Moreover, we proved circ_0058106 promoted HSCC cells tumorigenesis and EMT process by regulating Wnt2b/β-catenin/c-Myc pathway via miR-185-3p. In conclusion, our findings firstly confirmed the carcinogenic effect of circ_0058106 in promoting HSCC cells tumorigenesis, metastasis, invasion and EMT process by regulating Wnt2b/β-catenin/c-Myc pathway through sponging miR-185-3p, indicating that circ_0058106 may be a new therapeutic target and prognostic marker for HSCC.
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Affiliation(s)
- Ce Li
- Department of Otorhinolaryngology, Qilu Hospital, Shandong University; NHC Key Laboratory of Otorhinolaryngology (Shandong University), 107 West Wenhua Road, 250012, Jinan, Shandong, China
| | - Wenming Li
- Department of Otorhinolaryngology, Qilu Hospital, Shandong University; NHC Key Laboratory of Otorhinolaryngology (Shandong University), 107 West Wenhua Road, 250012, Jinan, Shandong, China
| | - Shengda Cao
- Department of Otorhinolaryngology, Qilu Hospital, Shandong University; NHC Key Laboratory of Otorhinolaryngology (Shandong University), 107 West Wenhua Road, 250012, Jinan, Shandong, China
| | - Jianing Xu
- Department of Otorhinolaryngology, Qilu Hospital, Shandong University; NHC Key Laboratory of Otorhinolaryngology (Shandong University), 107 West Wenhua Road, 250012, Jinan, Shandong, China
| | - Ye Qian
- Department of Otorhinolaryngology, Qilu Hospital, Shandong University; NHC Key Laboratory of Otorhinolaryngology (Shandong University), 107 West Wenhua Road, 250012, Jinan, Shandong, China
| | - Xinliang Pan
- Department of Otorhinolaryngology, Qilu Hospital, Shandong University; NHC Key Laboratory of Otorhinolaryngology (Shandong University), 107 West Wenhua Road, 250012, Jinan, Shandong, China
| | - Dapeng Lei
- Department of Otorhinolaryngology, Qilu Hospital, Shandong University; NHC Key Laboratory of Otorhinolaryngology (Shandong University), 107 West Wenhua Road, 250012, Jinan, Shandong, China
| | - Dongmin Wei
- Department of Otorhinolaryngology, Qilu Hospital, Shandong University; NHC Key Laboratory of Otorhinolaryngology (Shandong University), 107 West Wenhua Road, 250012, Jinan, Shandong, China.
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3
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miR-185-3p targets Annexin-A8 to inhibit proliferation in cervical cancer cells. Cytotechnology 2021; 73:585-592. [PMID: 34349348 DOI: 10.1007/s10616-021-00479-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Accepted: 05/28/2021] [Indexed: 10/21/2022] Open
Abstract
Numerous studies have found that microRNAs (miRNAs) are involved in regulating various tumor-related biological functions. The downregulation of miR185-3p have been identified in various types of cancer but the effect and its underlying molecular mechanism in cervical cancer have not been elucidated. Therefore, it is important to investigate the role of miRNAs associated with cervical cancer and its corresponding molecular mechanism to develop new therapeutic targets. The cell counting kit (CCK-8) assay was performed to measure the cell viability. The quantitative real-time PCR (qRT-PCR) and western blot analyses were carried out to identify mRNA and protein expression levels, respectively. Besides, a luciferase activity assay was conducted to confirm the target miRNA gene predictions. In this study, it is found that miR185-3p expression was potentially downregulated in cervical cancer tissues when compared with normal tissues. The CCK-8 results indicated that miR185-3p overexpression suppressed the cancer cell proliferation and the downregulation of miR185-3p enhanced the cancer cell growth. Further, enhanced miR185-3p expression led to a reduction in Annexin-A8 (Anx-A8) expression but miR185-3p inhibition promoted ANX-A8 levels in cervical cancer cells. The luciferase reporter assay indicated that ANX-A8 was a direct target of miR185-3p in cervical cancer cells.
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4
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Huang C, Wu YJ, He WF, Zhao SL, Ouyang YY, Ai XH, Liu ZQ, Tang SY. MiR-185-3p regulates epithelial mesenchymal transition via PI3K/Akt signaling pathway by targeting cathepsin D in gastric cancer cells. Transl Cancer Res 2020; 9:6988-7000. [PMID: 35117305 PMCID: PMC8799188 DOI: 10.21037/tcr-19-2133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Accepted: 09/11/2020] [Indexed: 11/28/2022]
Abstract
BACKGROUND Recently research reported that miR-185-3p could serve as an independent prognosis factor in gastric cancer (GC). However, the functional role and underlying mechanism of miR-185-3p in GC and epithelial-mesenchymal transition (EMT) progression remains largely elusive. METHODS Quantitative real-time polymerase chain reaction (qRT-PCR) was carried out to analyze the expression of miR-185-3p and cathepsin D in patient-derived GC samples and various GC cell lines. Scratch assay and Transwell assay were used to evaluate the migration ability. The influence of miR-185-3p on the cell cycle distribution and cell apoptosis was evaluated using flow cytometry. Western blotting assay was performed to detect the expression of EMT associated proteins and the activity of PI3K/Akt signaling pathway. Furthermore, the interaction between miR-185-3p and cathepsin D was explored by dual-luciferase reporter assay. RESULTS Our data revealed that miR-185-3p was down-regulated, while cathepsin D was up-regulated in both patient-derived GC samples and GC cells. Apart from inducing apoptosis, overexpression of miR-185-3p also inhibited EMT process and migration of GC cells. Mechanically, we firstly verified that miR-185-3p directly targeted the cathepsin D. Furthermore, miR-185-3p exerted its function on EMT process and migration via inhibiting cathepsin D to mediated PI3K/Akt signaling pathway. CONCLUSIONS Our findings suggested that miR-185-3p targeted cathepsin D inhibiting EMT process via PI3K/Akt signaling, which may serve as a potential prognosis factor and therapeutic target to reduce the malignancy of GCs.
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Affiliation(s)
- Cheng Huang
- Oncology Department, Brain Hospital of Hunan Province, Changsha, China
| | - Yang-Jie Wu
- Oncology Department of Medical, The First Affiliated Hospital, University of South China, Hengyang, China
| | - Wei-Feng He
- Oncology Department, Brain Hospital of Hunan Province, Changsha, China
| | - Shun-Li Zhao
- Oncology Department, Brain Hospital of Hunan Province, Changsha, China
| | | | - Xiao-Hong Ai
- Oncology Department of Medical, The First Affiliated Hospital, University of South China, Hengyang, China
| | - Zhi-Qi Liu
- Oncology Department, Brain Hospital of Hunan Province, Changsha, China
| | - San-Yuan Tang
- Oncology Department, Brain Hospital of Hunan Province, Changsha, China
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5
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Zhou C, Kong W, Ju T, Xie Q, Zhai L. MiR-185-3p mimic promotes the chemosensitivity of CRC cells via AQP5. Cancer Biol Ther 2020; 21:790-798. [PMID: 32588739 DOI: 10.1080/15384047.2020.1761238] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Studies showed that microRNAs (miRNAs) are important regulators in drug resistance. The current study investigated the role of miR-185-3p and its predicted target gene AQP5 in 5-FU-insensitive colorectal cancer (CRC) cells. METHODS Quantitative real-time polymerase chain reaction (qRT-PCR) and Spearman's correlation analysis were conducted to determine the correlation of expression levels of miR-185-3p and AQP5 from CRC tissues. HCT-116 and HCT-8 cells were treated by gradient concentration of 5-FU to construct 5-FU-resistant CRC model. The inhibition and viability of 5-FU-resistant cells were detected by MTT assay, and cell migration and invasion ability were determined by wound healing and transwell assay. The expressions of miR-185-3p and AQP5 were measured by qRT-PCR. StarBase and dual-luciferase reporter assay were used to predict and confirm the interaction between miR-185-3p and AQP5. Further experiments were performed to explore the function of miR-185-3p in 5-FU-resistant cells through regulating aquaporin-5 (AQP5). The levels of EMT-associated markers and AQP5 were determined by conducting Western Blot and qRT-PCR. RESULTS We found that 5-FU-resistant CRC cells showed a lower inhibition rate, and higher migration and invasion abilities. MiR-185-3p was low-expressed in CRC tissues and 5-FU-resistance cells, and it targeted and regulated the expression of AQP5, which was found up-regulated in CRC and 5-FU-resistance CRC cells (r = -0.29, P < .05). Furthermore, miR-185-3p mimic enhanced the chemo-sensitivity of 5-FU-resistant cells, while overexpressed AQP5 reversed such an effect produced by miR-185-3p mimic. CONCLUSION MiR-185-3p mimic enhances the chemosensitivity of CRC cells via AQP5. Our research provides a potential therapeutic target for 5-FU-resistant CRC cells.
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Affiliation(s)
- Chunhua Zhou
- Department of Gastrointestinal Surgery, Affiliated Hangzhou First People's Hospital, Zhejiang University School of Medicine , Hangzhou, Zhejiang Province, China
| | - Wencheng Kong
- Department of Gastrointestinal Surgery, Affiliated Hangzhou First People's Hospital, Zhejiang University School of Medicine , Hangzhou, Zhejiang Province, China
| | - Tongfa Ju
- Department of Gastrointestinal Surgery, Affiliated Hangzhou First People's Hospital, Zhejiang University School of Medicine , Hangzhou, Zhejiang Province, China
| | - Qi Xie
- Department of Gastrointestinal Surgery, Affiliated Hangzhou First People's Hospital, Zhejiang University School of Medicine , Hangzhou, Zhejiang Province, China
| | - Lulu Zhai
- Department of Gastrointestinal Surgery, Affiliated Hangzhou First People's Hospital, Zhejiang University School of Medicine , Hangzhou, Zhejiang Province, China
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DC-SIGN-LEF1/TCF1-miR-185 feedback loop promotes colorectal cancer invasion and metastasis. Cell Death Differ 2019; 27:379-395. [PMID: 31217502 PMCID: PMC7205996 DOI: 10.1038/s41418-019-0361-2] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2018] [Revised: 03/31/2019] [Accepted: 05/28/2019] [Indexed: 02/07/2023] Open
Abstract
DC-SIGN is previously focused on its physiologic and pathophysiologic roles in immune cells. Little is known about whether DC-SIGN is expressed in malignant epithelial cells and how DC-SIGN participates in tumor progression. Here we showed that DC-SIGN expression was increased in metastatic colorectal cancer (CRC) cell lines and patient tissues. The overall survival in CRC patients with positive DC-SIGN was remarkably reduced. Gain of DC-SIGN function facilitated the CRC metastases both in vitro and in vivo, and this effect was reversed by miR-185. DC-SIGN and Lyn interacted physically, and Lyn maintained the stability of DC-SIGN in cells. DC-SIGN activation recruited Lyn and p85 to form the DC-SIGN-Lyn-p85 complex, which promoted CRC metastasis by increasing PI3K/Akt/β-catenin signaling in tyrosine kinase Lyn-dependent manner. Furthermore, activation of DC-SIGN promoted the transcription of MMP-9 and VEGF by increasing PI3K/Akt/β-catenin signaling, and induced TCF1/LEF1-mediated suppression of miR-185. Our findings reveal the presence of the DC-SIGN–TCF1/LEF1–miR-185 loop in cancer cells with metastatic traits, implying that it may represent a new pathogenic mechanism of CRC metastasis. This character of the loop promises to provide new targets for blocking CRC invasive and metastatic activity.
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7
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O’Leary CA, Andrews RJ, Tompkins VS, Chen JL, Childs-Disney JL, Disney MD, Moss WN. RNA structural analysis of the MYC mRNA reveals conserved motifs that affect gene expression. PLoS One 2019; 14:e0213758. [PMID: 31206539 PMCID: PMC6576772 DOI: 10.1371/journal.pone.0213758] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Accepted: 05/30/2019] [Indexed: 12/15/2022] Open
Abstract
The MYC gene encodes a human transcription factor and proto-oncogene that is dysregulated in over half of all known cancers. To better understand potential post-transcriptional regulatory features affecting MYC expression, we analyzed secondary structures in the MYC mRNA using a program that is optimized for finding small locally-folded motifs with a high propensity for function. This was accomplished by calculating folding metrics across the MYC sequence using a sliding analysis window and generating unique consensus base pairing models weighted by their lower-than-random predicted folding energy. A series of 30 motifs were identified, primarily in the 5' and 3' untranslated regions, which show evidence of structural conservation and compensating mutations across vertebrate MYC homologs. This analysis was able to recapitulate known elements found within an internal ribosomal entry site, as well as discover a novel element in the 3' UTR that is unusually stable and conserved. This novel motif was shown to affect MYC expression, potentially via the modulation of miRNA target accessibility or other trans-regulatory factors. In addition to providing basic insights into mechanisms that regulate MYC expression, this study provides numerous, potentially druggable RNA targets for the MYC gene, which is considered “undruggable” at the protein level.
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Affiliation(s)
- Collin A. O’Leary
- Roy J. Carver Department of Biophysics, Biochemistry and Molecular Biology, Iowa State University, Ames, IA, United States of America
| | - Ryan J. Andrews
- Roy J. Carver Department of Biophysics, Biochemistry and Molecular Biology, Iowa State University, Ames, IA, United States of America
| | - Van S. Tompkins
- Roy J. Carver Department of Biophysics, Biochemistry and Molecular Biology, Iowa State University, Ames, IA, United States of America
| | - Jonathan L. Chen
- Department of Chemistry, The Scripps Research Institute, Jupiter, FL, United States of America
| | | | - Matthew D. Disney
- Department of Chemistry, The Scripps Research Institute, Jupiter, FL, United States of America
| | - Walter N. Moss
- Roy J. Carver Department of Biophysics, Biochemistry and Molecular Biology, Iowa State University, Ames, IA, United States of America
- * E-mail:
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8
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Orang AV, Petersen J, McKinnon RA, Michael MZ. Micromanaging aerobic respiration and glycolysis in cancer cells. Mol Metab 2019; 23:98-126. [PMID: 30837197 PMCID: PMC6479761 DOI: 10.1016/j.molmet.2019.01.014] [Citation(s) in RCA: 70] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Revised: 01/22/2019] [Accepted: 01/30/2019] [Indexed: 01/17/2023] Open
Abstract
BACKGROUND Cancer cells possess a common metabolic phenotype, rewiring their metabolic pathways from mitochondrial oxidative phosphorylation to aerobic glycolysis and anabolic circuits, to support the energetic and biosynthetic requirements of continuous proliferation and migration. While, over the past decade, molecular and cellular studies have clearly highlighted the association of oncogenes and tumor suppressors with cancer-associated glycolysis, more recent attention has focused on the role of microRNAs (miRNAs) in mediating this metabolic shift. Accumulating studies have connected aberrant expression of miRNAs with direct and indirect regulation of aerobic glycolysis and associated pathways. SCOPE OF REVIEW This review discusses the underlying mechanisms of metabolic reprogramming in cancer cells and provides arguments that the earlier paradigm of cancer glycolysis needs to be updated to a broader concept, which involves interconnecting biological pathways that include miRNA-mediated regulation of metabolism. For these reasons and in light of recent knowledge, we illustrate the relationships between metabolic pathways in cancer cells. We further summarize our current understanding of the interplay between miRNAs and these metabolic pathways. This review aims to highlight important metabolism-associated molecular components in the hunt for selective preventive and therapeutic treatments. MAJOR CONCLUSIONS Metabolism in cancer cells is influenced by driver mutations but is also regulated by posttranscriptional gene silencing. Understanding the nuanced regulation of gene expression in these cells and distinguishing rapid cellular responses from chronic adaptive mechanisms provides a basis for rational drug design and novel therapeutic strategies.
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Affiliation(s)
- Ayla V Orang
- Flinders Centre for Innovation in Cancer, Flinders University, Flinders Medical Centre, Adelaide, South Australia 5042, Australia.
| | - Janni Petersen
- Flinders Centre for Innovation in Cancer, Flinders University, Flinders Medical Centre, Adelaide, South Australia 5042, Australia.
| | - Ross A McKinnon
- Flinders Centre for Innovation in Cancer, Flinders University, Flinders Medical Centre, Adelaide, South Australia 5042, Australia.
| | - Michael Z Michael
- Flinders Centre for Innovation in Cancer, Flinders University, Flinders Medical Centre, Adelaide, South Australia 5042, Australia.
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9
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Swier LJYM, Dzikiewicz‐Krawczyk A, Winkle M, van den Berg A, Kluiver J. Intricate crosstalk between MYC and non-coding RNAs regulates hallmarks of cancer. Mol Oncol 2019; 13:26-45. [PMID: 30451365 PMCID: PMC6322196 DOI: 10.1002/1878-0261.12409] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Revised: 10/10/2018] [Accepted: 10/23/2018] [Indexed: 01/17/2023] Open
Abstract
Myelocytomatosis viral oncogene homolog (MYC) plays an important role in the regulation of many cellular processes, and its expression is tightly regulated at the level of transcription, translation, protein stability, and activity. Despite this tight regulation, MYC is overexpressed in many cancers and contributes to multiple hallmarks of cancer. In recent years, it has become clear that noncoding RNAs add a crucial additional layer to the regulation of MYC and its downstream effects. So far, twenty-five microRNAs and eighteen long noncoding RNAs that regulate MYC have been identified. Thirty-three miRNAs and nineteen lncRNAs are downstream effectors of MYC that contribute to the broad oncogenic role of MYC, including its effects on diverse hallmarks of cancer. In this review, we give an overview of this extensive, multilayered noncoding RNA network that exists around MYC. Current data clearly show explicit roles of crosstalk between MYC and ncRNAs to allow tumorigenesis.
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Affiliation(s)
- Lotteke J. Y. M. Swier
- Department of Pathology and Medical BiologyUniversity of GroningenUniversity Medical Center GroningenThe Netherlands
| | | | - Melanie Winkle
- Department of Pathology and Medical BiologyUniversity of GroningenUniversity Medical Center GroningenThe Netherlands
| | - Anke van den Berg
- Department of Pathology and Medical BiologyUniversity of GroningenUniversity Medical Center GroningenThe Netherlands
| | - Joost Kluiver
- Department of Pathology and Medical BiologyUniversity of GroningenUniversity Medical Center GroningenThe Netherlands
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10
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Uhr K, Sieuwerts AM, de Weerd V, Smid M, Hammerl D, Foekens JA, Martens JWM. Association of microRNA-7 and its binding partner CDR1-AS with the prognosis and prediction of 1 st-line tamoxifen therapy in breast cancer. Sci Rep 2018; 8:9657. [PMID: 29941867 PMCID: PMC6018428 DOI: 10.1038/s41598-018-27987-w] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Accepted: 06/12/2018] [Indexed: 12/12/2022] Open
Abstract
The large number of non-coding RNAs (ncRNAs) and their breadth of functionalities has fuelled many studies on their roles in cancer. We previously linked four microRNAs to breast cancer prognosis. One of these microRNAs, hsa-miR-7, was found to be regulated by another type of ncRNA, the circular non-coding RNA (circRNA) CDR1-AS, which contains multiple hsa-miR-7 binding sites. Based on this finding, we studied the potential clinical value of this circRNA on breast cancer prognosis in a cohort based on a cohort that was previously analysed for hsa-miR-7 and in an adjuvant hormone-naïve cohort for 1st-line tamoxifen treatment outcomes, in which we also analysed hsa-miR-7. A negative correlation was observed between hsa-miR-7 and CDR1-AS in both cohorts. Despite associations with various clinical metrics (e.g., tumour grade, tumour size, and relapse location), CDR1-AS was neither prognostic nor predictive of relevant outcomes in our cohorts. However, we did observe stromal CDR1-AS expression, suggesting a possible cell-type specific interaction. Next to the known association of hsa-miR-7 expression with poor prognosis in primary breast cancer, we found that high hsa-miR-7 expression was predictive of an adverse response to tamoxifen therapy and poor progression-free and post-relapse overall survival in patients with recurrent disease.
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Affiliation(s)
- K Uhr
- Erasmus MC Cancer Institute, Erasmus University Medical Centre, Department of Medical Oncology and Cancer Genomics, Wytemaweg 80, 3015 CN, Rotterdam, The Netherlands
| | - A M Sieuwerts
- Erasmus MC Cancer Institute, Erasmus University Medical Centre, Department of Medical Oncology and Cancer Genomics, Wytemaweg 80, 3015 CN, Rotterdam, The Netherlands.
| | - V de Weerd
- Erasmus MC Cancer Institute, Erasmus University Medical Centre, Department of Medical Oncology and Cancer Genomics, Wytemaweg 80, 3015 CN, Rotterdam, The Netherlands
| | - M Smid
- Erasmus MC Cancer Institute, Erasmus University Medical Centre, Department of Medical Oncology and Cancer Genomics, Wytemaweg 80, 3015 CN, Rotterdam, The Netherlands
| | - D Hammerl
- Erasmus MC Cancer Institute, Erasmus University Medical Centre, Department of Medical Oncology and Cancer Genomics, Wytemaweg 80, 3015 CN, Rotterdam, The Netherlands
| | - J A Foekens
- Erasmus MC Cancer Institute, Erasmus University Medical Centre, Department of Medical Oncology and Cancer Genomics, Wytemaweg 80, 3015 CN, Rotterdam, The Netherlands
| | - J W M Martens
- Erasmus MC Cancer Institute, Erasmus University Medical Centre, Department of Medical Oncology and Cancer Genomics, Wytemaweg 80, 3015 CN, Rotterdam, The Netherlands
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11
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Li J, Liu H, Zou L, Ke J, Zhang Y, Zhu Y, Yang Y, Gong Y, Tian J, Zou D, Peng X, Gong J, Zhong R, Huang K, Chang J, Miao X. A functional variant in GREM1 confers risk for colorectal cancer by disrupting a hsa-miR-185-3p binding site. Oncotarget 2017; 8:61318-61326. [PMID: 28977865 PMCID: PMC5617425 DOI: 10.18632/oncotarget.18095] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2017] [Accepted: 04/26/2017] [Indexed: 12/27/2022] Open
Abstract
The transforming growth factor beta (TGF-β) pathway has been implicated in carcinogenesis of intestinal canal. Except for common variants indentified by genome-wide association studies, variants with lower frequency can also explain a part of the disease heritability, especially those in gene regulatory regions. In this study, we searched for colorectal cancer (CRC) related functional low-frequency variants (minor allele frequency 1-5%) in untranslated regions (UTR) involved in the TGF-β signaling using a next-generation sequencing based approach. A case-control study including 1,841 CRC cases and 1,837 controls was performed to identify CRC associated variants and biological experiments were applied to further explore the potential functions of the significant variants. Three low-frequency UTR variants were selected as our candidates and subsequent association analyses showed that a low-frequency variant rs12915554 in the 3’ UTR of GREM1 was significantly associated with CRC risk (Additive model: OR=1.43, 95%CI: 1.04-1.95, P=0.026). Functional annotations suggested that rs12915554 variation increased the expression of GREM1 by perturbing a hsa-miR-185-3p binding site. Moreover, higher expression level of GREM1 was investigated in colon tumor tissues compared with adjacent normal tissues using TCGA data. In conclusion, low-frequency UTR variant rs12915554 in the gene GREM1 was in relation to CRC susceptibility in a Chinese population and this variation might promote CRC development through enhancing GREM1 expression in a miRNA-mediated posttranscriptional manner.
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Affiliation(s)
- Jiaoyuan Li
- Department of Epidemiology and Biostatistics, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Hui Liu
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, China
| | - Li Zou
- Department of Health Care, Bao'an Maternal and Child Health Hospital, Shenzhen, China
| | - Juntao Ke
- Department of Epidemiology and Biostatistics, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yi Zhang
- Department of Epidemiology and Biostatistics, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Ying Zhu
- Department of Epidemiology and Biostatistics, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yang Yang
- Department of Epidemiology and Biostatistics, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yajie Gong
- Department of Epidemiology and Biostatistics, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Jianbo Tian
- Department of Epidemiology and Biostatistics, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Danyi Zou
- Department of Epidemiology and Biostatistics, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Xiating Peng
- Department of Epidemiology and Biostatistics, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Jing Gong
- Department of Epidemiology and Biostatistics, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Rong Zhong
- Department of Epidemiology and Biostatistics, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Kun Huang
- Tongji School of Pharmacy, Huazhong University of Science and Technology, Wuhan, China
| | - Jiang Chang
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Xiaoping Miao
- Department of Epidemiology and Biostatistics, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
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12
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Liu C, Li G, Ren S, Su Z, Wang Y, Tian Y, Liu Y, Qiu Y. miR-185-3p regulates the invasion and metastasis of nasopharyngeal carcinoma by targeting WNT2B in vitro. Oncol Lett 2017; 13:2631-2636. [PMID: 28454443 PMCID: PMC5403522 DOI: 10.3892/ol.2017.5778] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2015] [Accepted: 01/06/2017] [Indexed: 01/06/2023] Open
Abstract
MicroRNAs (miRs) have been recognised as important regulators of malignant behaviour in different types of human cancer, including nasopharyngeal carcinoma (NPC). A previous study by our group revealed that miR-185-3p regulates the radioresistance of NPC cells. The present study aimed to investigate the effect of miR-185-3p on NPC invasion and metastasis. Human NPC CNE-2 and 5-8F cell lines were transfected with a miR-185-3p mimic and miR-185-3p inhibitor, respectively, and their effects on the invasion and metastasis of these cells was assessed using a wound healing assay and Matrigel invasion assay. The target gene of miR-185-3p, Wnt family member 2B (WNT2B) was silenced in 5-8F cells using siRNA in order to investigate its function in NPC. Data from the present study demonstrated that the expression of miR-185-3p was the highest in 5-8F and lowest in CNE-2 cells out of a range of NPC cell lines. Following the transfection of miR-185-3p mimic into CNE-2 cells, the wound healing and Matrigel invasion assays indicated that the migration and invasion ability of CNE-2 cells was significantly reduced compared with the negative control group. In addition, the inhibition of miR-185-3p in 5-8F cells significantly increased the capacity for migration and invasion. Furthermore, silencing WNT2B expression resulted in a significant reduction in the invasion and metastasis in 5-8F cells. The inhibition of miR-185-3p, which promotes invasion and metastasis, could be reversed through the silencing of WNT2B in 5-8F cells. The results of the present study indicate that miR-185-3p mediates the invasion and metastasis of NPC by targeting WNT2B in vitro.
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Affiliation(s)
- Chao Liu
- Department of Otolaryngology Head and Neck Surgery, Xiangya Hospital Central South University, Changsha, Hunan 410008, P.R. China.,Otolaryngology Major Disease Research Key Laboratory of Hunan, Xiangya Hospital Central South University, Changsha, Hunan 410008, P.R. China
| | - Guo Li
- Department of Otolaryngology Head and Neck Surgery, Xiangya Hospital Central South University, Changsha, Hunan 410008, P.R. China.,Otolaryngology Major Disease Research Key Laboratory of Hunan, Xiangya Hospital Central South University, Changsha, Hunan 410008, P.R. China
| | - Shuling Ren
- Department of Otolaryngology Head and Neck Surgery, Xiangya Hospital Central South University, Changsha, Hunan 410008, P.R. China.,Otolaryngology Major Disease Research Key Laboratory of Hunan, Xiangya Hospital Central South University, Changsha, Hunan 410008, P.R. China
| | - Zhongwu Su
- Department of Otolaryngology Head and Neck Surgery, Xiangya Hospital Central South University, Changsha, Hunan 410008, P.R. China.,Otolaryngology Major Disease Research Key Laboratory of Hunan, Xiangya Hospital Central South University, Changsha, Hunan 410008, P.R. China
| | - Yunyun Wang
- Department of Otolaryngology Head and Neck Surgery, Xiangya Hospital Central South University, Changsha, Hunan 410008, P.R. China.,Otolaryngology Major Disease Research Key Laboratory of Hunan, Xiangya Hospital Central South University, Changsha, Hunan 410008, P.R. China
| | - Yongquan Tian
- Department of Otolaryngology Head and Neck Surgery, Xiangya Hospital Central South University, Changsha, Hunan 410008, P.R. China.,Otolaryngology Major Disease Research Key Laboratory of Hunan, Xiangya Hospital Central South University, Changsha, Hunan 410008, P.R. China
| | - Yong Liu
- Department of Otolaryngology Head and Neck Surgery, Xiangya Hospital Central South University, Changsha, Hunan 410008, P.R. China.,Otolaryngology Major Disease Research Key Laboratory of Hunan, Xiangya Hospital Central South University, Changsha, Hunan 410008, P.R. China
| | - Yuanzheng Qiu
- Department of Otolaryngology Head and Neck Surgery, Xiangya Hospital Central South University, Changsha, Hunan 410008, P.R. China.,Otolaryngology Major Disease Research Key Laboratory of Hunan, Xiangya Hospital Central South University, Changsha, Hunan 410008, P.R. China
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13
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Xie F, Yuan Y, Xie L, Ran P, Xiang X, Huang Q, Qi G, Guo X, Xiao C, Zheng S. miRNA-320a inhibits tumor proliferation and invasion by targeting c-Myc in human hepatocellular carcinoma. Onco Targets Ther 2017; 10:885-894. [PMID: 28243124 PMCID: PMC5317304 DOI: 10.2147/ott.s122992] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND Downregulated expression levels of microRNA-320a (miR-320a) were found in primary breast cancers and colorectal cancer. Previous findings indicated that miRNA-320a may involve in the cancer development. In this study, we explored the roles of miR-320a by targeting c-Myc in the tumor growth of hepatocellular carcinoma (HCC). METHODS Quantitative reverse-transcription polymerase chain reaction (qRT-PCR) was performed to detect the expression of miR-320a in 50 HCC tissues and four HCC cells. Luciferase reporter assay was conducted to confirm the direct downstream target of miR-320a in HEK-293 cells. The effect of miR-320a on endogenous c-Myc expression was investigated by transfecting miR-320a mimics into HepG2 and QGY-7703 cell lines. The c-Myc and miR-320a expressions were analyzed by immunohistochemistry (IHC) and qRT-PCR in the same HCC tissues. Furthermore, the biological functional correlation of miR-320a with c-Myc was determined by studying the effect of miR-320a mimics or c-Myc small interfering RNA (siRNA) on HCC cell proliferation and invasion. RESULTS The expression of miR-320a was downregulated in 50 HCC tissues and 4 HCC cells. Luciferase assay revealed that c-Myc is a direct target of miR-320a. IHC and Western blot analysis showed that the c-Myc expression was inhibited by miR-320a in HCC tissues and cell lines. Upregulation of miR-320a suppressed the HCC cell proliferation and invasion capacity induced by inhibiting c-Myc, and the results were consistent with the effects of c-Myc siRNA on tumor suppression. These results revealed that miRNA-320a inhibits tumor proliferation and invasion by targeting c-Myc in HCC cells. CONCLUSION Our results showed that miR-320a functions as a tumor suppressor in HCC. By targeting c-Myc directly, miR-320a inhibits the HCC cell growth. Our studies provide evidence of miR-320a as a potentially target for HCC treatment.
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Affiliation(s)
- Fei Xie
- School of Medicine, Yunnan University, Kunming, Yunnan
| | - Yuncang Yuan
- School of Medicine, Yunnan University, Kunming, Yunnan
| | - Luyang Xie
- Department of Stomatology, Shanghai Tenth People's Hospital, Shanghai
| | - Pengzhan Ran
- School of Medicine, Yunnan University, Kunming, Yunnan
| | - Xudong Xiang
- Department of Gastrointestinal Surgery, The Third Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, People's Republic of China
| | | | - Guoxiang Qi
- School of Medicine, Yunnan University, Kunming, Yunnan
| | - Xiaopeng Guo
- School of Medicine, Yunnan University, Kunming, Yunnan
| | - Chunjie Xiao
- School of Medicine, Yunnan University, Kunming, Yunnan
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14
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Liu C, Guo H, Cheng X, Shao M, Wu C, Wang S, Li H, Wei L, Gao Y, Tan W, Cheng S, Wu T, Yu D, Lin D. Exposure to airborne PM2.5 suppresses microRNA expression and deregulates target oncogenes that cause neoplastic transformation in NIH3T3 cells. Oncotarget 2016; 6:29428-39. [PMID: 26338969 PMCID: PMC4745737 DOI: 10.18632/oncotarget.5005] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2015] [Accepted: 08/11/2015] [Indexed: 12/15/2022] Open
Abstract
Long-term exposure to airborne PM2.5 is associated with increased lung cancer risk but the underlying mechanism remains unclear. We characterized global microRNA and mRNA expression in human bronchial epithelial cells exposed to PM2.5 organic extract and integrally analyzed microRNA-mRNA interactions. Foci formation and xenograft tumorigenesis in mice with NIH3T3 cells expressing genes targeted by microRNAs were performed to explore the oncogenic potential of these genes. We also detected plasma levels of candidate microRNAs in subjects exposed to different levels of air PM2.5 and examined the aberrant expression of genes targeted by these microRNAs in human lung cancer. Under our experimental conditions, treatment of cells with PM2.5 extract resulted in downregulation of 138 microRNAs and aberrant expression of 13 mRNAs (11 upregulation and 2 downregulation). In silico and biochemical analyses suggested SLC30A1, SERPINB2 and AKR1C1, among the upregulated genes, as target for miR-182 and miR-185, respectively. Ectopic expression of each of these genes significantly enhanced foci formation in NIH3T3 cells. Following subcutaneous injection of these cells into nude mice, fibrosarcoma were formed from SLC30A1- or SERPINB2-expressing cells. Reduced plasma levels of miR-182 were detected in subjects exposed to high level of PM2.5 than in those exposed to low level of PM2.5 (P = 0.043). Similar results were seen for miR-185 although the difference was not statistically significant (P = 0.328). Increased expressions of SLC30A1, SERPINB2 and AKR1C1 were detected in human lung cancer. These results suggest that modulation of miR-182 and miR-185 and their target genes may contribute to lung carcinogenesis attributable to PM2.5 exposure.
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Affiliation(s)
- Chunling Liu
- State Key Laboratory of Molecular Oncology and Department of Etiology and Carcinogenesis, Cancer Institute and Hospital, Chinese Academy of Medical Science and Peking Union Medical College, Beijing, China
| | - Huan Guo
- Department of Occupational and Environmental Health and Ministry of Education Key Lab for Environment and Health, School of Public Health, Huazhong University of Sciences and Technology, Wuhan, China
| | - Xinxin Cheng
- State Key Laboratory of Molecular Oncology and Department of Etiology and Carcinogenesis, Cancer Institute and Hospital, Chinese Academy of Medical Science and Peking Union Medical College, Beijing, China
| | - Mingming Shao
- State Key Laboratory of Molecular Oncology and Department of Etiology and Carcinogenesis, Cancer Institute and Hospital, Chinese Academy of Medical Science and Peking Union Medical College, Beijing, China
| | - Chen Wu
- State Key Laboratory of Molecular Oncology and Department of Etiology and Carcinogenesis, Cancer Institute and Hospital, Chinese Academy of Medical Science and Peking Union Medical College, Beijing, China
| | - Suhan Wang
- Department of Occupational and Environmental Health and Ministry of Education Key Lab for Environment and Health, School of Public Health, Huazhong University of Sciences and Technology, Wuhan, China
| | - Hongmin Li
- State Key Laboratory of Molecular Oncology and Department of Etiology and Carcinogenesis, Cancer Institute and Hospital, Chinese Academy of Medical Science and Peking Union Medical College, Beijing, China
| | - Lixuan Wei
- State Key Laboratory of Molecular Oncology and Department of Etiology and Carcinogenesis, Cancer Institute and Hospital, Chinese Academy of Medical Science and Peking Union Medical College, Beijing, China
| | - Yanning Gao
- State Key Laboratory of Molecular Oncology and Department of Etiology and Carcinogenesis, Cancer Institute and Hospital, Chinese Academy of Medical Science and Peking Union Medical College, Beijing, China
| | - Wen Tan
- State Key Laboratory of Molecular Oncology and Department of Etiology and Carcinogenesis, Cancer Institute and Hospital, Chinese Academy of Medical Science and Peking Union Medical College, Beijing, China
| | - Shujun Cheng
- State Key Laboratory of Molecular Oncology and Department of Etiology and Carcinogenesis, Cancer Institute and Hospital, Chinese Academy of Medical Science and Peking Union Medical College, Beijing, China
| | - Tangchun Wu
- Department of Occupational and Environmental Health and Ministry of Education Key Lab for Environment and Health, School of Public Health, Huazhong University of Sciences and Technology, Wuhan, China
| | - Dianke Yu
- State Key Laboratory of Molecular Oncology and Department of Etiology and Carcinogenesis, Cancer Institute and Hospital, Chinese Academy of Medical Science and Peking Union Medical College, Beijing, China
| | - Dongxin Lin
- State Key Laboratory of Molecular Oncology and Department of Etiology and Carcinogenesis, Cancer Institute and Hospital, Chinese Academy of Medical Science and Peking Union Medical College, Beijing, China
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15
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Li Y, Zhu Y, Prochownik EV. MicroRNA-based screens for synthetic lethal interactions with c-Myc. RNA & DISEASE 2016; 3:e1330. [PMID: 27975083 PMCID: PMC5152767 DOI: 10.14800/rd.1330] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
microRNAs (miRs) are small, non-coding RNAs, which play crucial roles in the development and progression of human cancer. Given that miRs are stable, easy to synthetize and readily introduced into cells, they have been viewed as having potential therapeutic benefit in cancer. c-Myc (Myc) is one of the most commonly deregulated oncogenic transcription factors and has important roles in the pathogenesis of cancer, thus making it an important, albeit elusive therapeutic target. Here we review the miRs that have been identified as being both positive and negative targets for Myc and how these participate in the complex phenotypes that arise as a result of Myc-driven transformation. We also discussseveral recent reports of Myc-synthetic lethal interactions with miRs.These highlight the importance and complexity of miRs in Myc-mediated biological functions and the opportunities for Myc-driven human cancer therapies.
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Affiliation(s)
- Youjun Li
- College of Life Sciences, Wuhan University, Wuhan 430072, China
- Medical Research Institute, Wuhan University, Wuhan 430071, China
| | - Yahui Zhu
- College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Edward V. Prochownik
- Division of Hematology/Oncology, Children's Hospital of Pittsburgh of UPMC and The Department of Microbiology and Molecular Genetics, The University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania 15224, USA
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16
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Liao JM, Cao B, Deng J, Zhou X, Strong M, Zeng S, Xiong J, Flemington E, Lu H. TFIIS.h, a new target of p53, regulates transcription efficiency of pro-apoptotic bax gene. Sci Rep 2016; 6:23542. [PMID: 27005522 PMCID: PMC4804275 DOI: 10.1038/srep23542] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Accepted: 03/03/2016] [Indexed: 11/09/2022] Open
Abstract
Tumor suppressor p53 transcriptionally regulates hundreds of genes involved in various cellular functions. However, the detailed mechanisms underlying the selection of p53 targets in response to different stresses are still elusive. Here, we identify TFIIS.h, a transcription elongation factor, as a new transcriptional target of p53, and also show that it can enhance the efficiency of transcription elongation of apoptosis-associated bax gene, but not cell cycle-associated p21 (CDKN1A) gene. TFIIS.h is revealed as a p53 target through microarray analysis of RNAs extracted from cells treated with or without inauhzin (INZ), a p53 activator, and further confirmed by RT-q-PCR, western blot, luciferase reporter, and ChIP assays. Interestingly, knocking down TFIIS.h impairs, but overexpressing TFIIS.h promotes, induction of bax, but not other p53 targets including p21, by p53 activation. In addition, overexpression of TFIIS.h induces cell death in a bax- dependent fashion. These findings reveal a mechanism by which p53 utilizes TFIIS.h to selectively promote the transcriptional elongation of the bax gene, upsurging cell death in response to severe DNA damage.
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Affiliation(s)
- Jun-Ming Liao
- Department of Biochemistry &Molecular Biology and Cancer Center, Tulane University School of Medicine, 1430, Louisiana, LA 70112, USA
| | - Bo Cao
- Department of Biochemistry &Molecular Biology and Cancer Center, Tulane University School of Medicine, 1430, Louisiana, LA 70112, USA
| | - Jun Deng
- Department of Biochemistry &Molecular Biology and Cancer Center, Tulane University School of Medicine, 1430, Louisiana, LA 70112, USA.,Department of Oncology, The First Affiliated Hospital of Nanchang University, Nanchang 330006, PR China
| | - Xiang Zhou
- Department of Biochemistry &Molecular Biology and Cancer Center, Tulane University School of Medicine, 1430, Louisiana, LA 70112, USA
| | - Michael Strong
- Department of Pathology and Cancer Center, Tulane University School of Medicine, 1430, Louisiana, LA 70112, USA
| | - Shelya Zeng
- Department of Biochemistry &Molecular Biology and Cancer Center, Tulane University School of Medicine, 1430, Louisiana, LA 70112, USA
| | - Jianping Xiong
- Department of Oncology, The First Affiliated Hospital of Nanchang University, Nanchang 330006, PR China
| | - Erik Flemington
- Department of Pathology and Cancer Center, Tulane University School of Medicine, 1430, Louisiana, LA 70112, USA
| | - Hua Lu
- Department of Biochemistry &Molecular Biology and Cancer Center, Tulane University School of Medicine, 1430, Louisiana, LA 70112, USA
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17
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Qin Z, He W, Tang J, Ye Q, Dang W, Lu Y, Wang J, Li G, Yan Q, Ma J. MicroRNAs Provide Feedback Regulation of Epithelial-Mesenchymal Transition Induced by Growth Factors. J Cell Physiol 2016; 231:120-9. [PMID: 26032086 DOI: 10.1002/jcp.25060] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2015] [Revised: 05/10/2015] [Accepted: 05/26/2015] [Indexed: 01/15/2023]
Abstract
As regulators in gene expression, microRNAs take part in most biological processes including cell differentiation, apoptosis, cell cycle, and epithelial-to-mesenchymal transition (EMT). In order to evaluate their roles in EMT process, microRNA expression profile changes induced by EGF or TGF-β treatment on nasopharyngeal carcinoma cell HK-1 were analyzed, and miR-21, miR-148a, miR-505, and miR-1207-5p were found to be upregulated in growth factors-induced EMT process. miR-21 is already known as an oncogenic miRNA to promote metastasis, however, the exact functions of other three miRNAs in EMT are unclear. To our surprise, we found that miR-148a, miR-505, and miR-1207-5p can suppress EMT and metastasis phenotypes in HK-1 cells both in vitro and in vivo, which may relate to their inhibition on EMT and Wnt signaling molecules. MiRNAs confer robustness to biological processes by posttranscriptional repression of key transcriptional programs that are related to previous developmental stages or to alternative cell fates. Our findings indicate that miRNA feedback circuit is tuned to respond to growth factors-induced EMT, and we suggested a new negative feedback loop which may be an important element of the EMT process and confer biological robustness.
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Affiliation(s)
- Zailong Qin
- The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan, China.,Cancer Research Institute, Central South University, Changsha, Hunan, China
| | - Wei He
- Cancer Research Institute, Central South University, Changsha, Hunan, China.,Xi'an Children's Hospital, Xi'an, Shaanxi, China
| | - Jingqun Tang
- Department of Thoracic Surgery, The Second Xiangya Hospital of Central South University, Changsha, Hunan, China
| | - Qiurong Ye
- Cancer Research Institute, Central South University, Changsha, Hunan, China
| | - Wei Dang
- Cancer Research Institute, Central South University, Changsha, Hunan, China
| | - Yuanjun Lu
- Cancer Research Institute, Central South University, Changsha, Hunan, China
| | - Jia Wang
- Cancer Research Institute, Central South University, Changsha, Hunan, China
| | - Guiyuan Li
- The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan, China.,Cancer Research Institute, Central South University, Changsha, Hunan, China.,Hunan Key Laboratory of Nonresolving Inflammation and Cancer, Key Laboratory of Carcinogenesis, Ministry of Health, Key Laboratory of Carcinogenesis and Cancer Invasion, Ministry of Education, Changsha, China
| | - Qun Yan
- Department of Laboratory Medicine, Xiangya Hospital of Central South University, Changsha, Hunan, China
| | - Jian Ma
- The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan, China.,Cancer Research Institute, Central South University, Changsha, Hunan, China.,Hunan Key Laboratory of Nonresolving Inflammation and Cancer, Key Laboratory of Carcinogenesis, Ministry of Health, Key Laboratory of Carcinogenesis and Cancer Invasion, Ministry of Education, Changsha, China
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18
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Jung JH, Liao JM, Zhang Q, Zeng S, Nguyen D, Hao Q, Zhou X, Cao B, Kim SH, Lu H. Inauhzin(c) inactivates c-Myc independently of p53. Cancer Biol Ther 2016; 16:412-9. [PMID: 25692307 DOI: 10.1080/15384047.2014.1002698] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Oncogene MYC is deregulated in many human cancers, especially in lymphoma. Previously, we showed that inauhzin (INZ) activates p53 and inhibits tumor growth. However, whether INZ could suppress cancer cell growth independently of p53 activity is still elusive. Here, we report that INZ(c), a second generation of INZ, suppresses c-Myc activity and thus inhibits growth of human lymphoma cells in a p53-independent manner. INZ(c) treatment decreased c-Myc expression at both mRNA and protein level, and suppressed c-Myc transcriptional activity in human Burkitt's lymphoma Raji cells with mutant p53. Also, we showed that overexpressing ectopic c-Myc rescues the inhibition of cell proliferation by INZ(c) in Raji cells, implicating c-Myc activity is targeted by INZ(c). Interestingly, the effect of INZ(c) on c-Myc expression was impaired by disrupting the targeting of c-Myc mRNA by miRNAs via knockdown of ribosomal protein (RP) L5, RPL11, or Ago2, a subunit of RISC complex, indicating that INZ(c) targets c-Myc via miRNA pathways. These results reveal a new mechanism that INZ
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Key Words
- Dox, doxorubicin
- FACS, Fluorescence-activated cell sorting
- GTP, guanosine triphosphate
- INZ, inauhzin
- Inauhzin
- MTT, 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide
- PBS, Phosphate Buffered Saline
- PI, propidium iodide
- RISC, RNA-induced silencing complex
- RP, ribosomal protein
- RPL11
- RPL5
- UTR, untranslated region
- c-Myc
- lymphoma
- microRNA
- q-RT-PCR, Real-time reverse transcription polymerase chain reaction
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Affiliation(s)
- Ji Hoon Jung
- a Department of Biochemistry & Molecular Biology and Cancer Center ; Tulane University School of Medicine ; New Orleans , LA USA
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19
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MicroRNA-130a associates with ribosomal protein L11 to suppress c-Myc expression in response to UV irradiation. Oncotarget 2015; 6:1101-14. [PMID: 25544755 PMCID: PMC4359220 DOI: 10.18632/oncotarget.2728] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2014] [Accepted: 11/08/2014] [Indexed: 12/31/2022] Open
Abstract
The oncoprotein c-Myc is essential for cell growth and proliferation while its deregulated overexpression is associated with most human cancers. Thus tightly regulated levels and activity of c-Myc are critical for maintaining normal cell homeostasis. c-Myc is down-regulated in response to several types of stress, including UV-induced DNA damage. Yet, mechanism underlying UV-induced c-Myc reduction is not completely understood. Here we report that L11 promotes miR-130a targeting of c-myc mRNA to repress c-Myc expression in response to UV irradiation. miR-130a targets the 3′-untranslated region (UTR) of c-myc mRNA. Overexpression of miR-130a promotes the Ago2 binding to c-myc mRNA, significantly reduces the levels of both c-Myc protein and mRNA and inhibits cell proliferation. UV treatment markedly promotes the binding of L11 to miR-130a, c-myc mRNA as well as Ago2 in cells. Inhibiting miR-130a significantly suppresses UV-mediated c-Myc reduction. We further show that L11 is relocalized from the nucleolus to the cytoplasm where it associates with c-myc mRNA upon UV treatment. Together, these results reveal a novel mechanism underlying c-Myc down-regulation in response to UV-mediated DNA damage, wherein L11 promotes miR-130a-loaded miRISC to target c-myc mRNA.
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20
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Zhang H, Davies KJA, Forman HJ. Oxidative stress response and Nrf2 signaling in aging. Free Radic Biol Med 2015; 88:314-336. [PMID: 26066302 PMCID: PMC4628850 DOI: 10.1016/j.freeradbiomed.2015.05.036] [Citation(s) in RCA: 577] [Impact Index Per Article: 64.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/25/2015] [Revised: 05/29/2015] [Accepted: 05/31/2015] [Indexed: 12/20/2022]
Abstract
Increasing oxidative stress, a major characteristic of aging, has been implicated in a variety of age-related pathologies. In aging, oxidant production from several sources is increased, whereas antioxidant enzymes, the primary lines of defense, are decreased. Repair systems, including the proteasomal degradation of damaged proteins, also decline. Importantly, the adaptive response to oxidative stress declines with aging. Nrf2/EpRE signaling regulates the basal and inducible expression of many antioxidant enzymes and the proteasome. Nrf2/EpRE activity is regulated at several levels, including transcription, posttranslation, and interactions with other proteins. This review summarizes current studies on age-related impairment of Nrf2/EpRE function and discusses the changes in Nrf2 regulatory mechanisms with aging.
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Affiliation(s)
- Hongqiao Zhang
- Ethel Percy Andrus Gerontology Center, Leonard Davis School of Gerontology
| | - Kelvin J A Davies
- Ethel Percy Andrus Gerontology Center, Leonard Davis School of Gerontology; Division of Molecular & Computational Biology, Department of Biological Sciences, Dornsife College of Letters, Arts, and Sciences, The University of Southern California, Los Angeles, CA 90089-0191, USA
| | - Henry Jay Forman
- Ethel Percy Andrus Gerontology Center, Leonard Davis School of Gerontology; School of Natural Science, University of California at Merced, Merced, CA 95344, USA.
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21
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Wang H, Cao F, Li X, Miao H, E J, Xing J, Fu CG. miR-320b suppresses cell proliferation by targeting c-Myc in human colorectal cancer cells. BMC Cancer 2015; 15:748. [PMID: 26487644 PMCID: PMC4617986 DOI: 10.1186/s12885-015-1728-5] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2014] [Accepted: 10/08/2015] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND MicroRNAs (miRNAs) are small noncoding RNAs that potentially play a critical role in tumorigenesis. Mounting evidence indicates that one specific miRNA: miR-320b is down regulated in numerous human cancers, including colorectal cancer (CRC); making the hypothesis that miR-320b may play a key role in tumorigenesis plausible. However, its role in carcinogenesis remains poorly defined. The goal of this study is to better clarify the role of miR-320b in tumor growth of CRC. METHODS Quantitative reverse-transcription polymerase chain reaction (qRT-PCR) was conducted to detect the expression of miR-320b in CRC tissues and 5 CRC cell lines. The effect of miR-320b on cell proliferation was analyzed in vitro and in vivo. Furthermore, a luciferase reporter assay was performed to measure the target effects of miR-320b. Lastly, the messenger RNA (mRNA) and protein levels of the gene c-MYC were measured in CRC cell lines and tissues by qRT-PCR, and confirmed via Western blot and Immunohistochemical (IHC) staining. RESULTS The results presented here showed that miR-320b expression was down regulated in both CRC tissues and cells. Overexpression of miR-320b in CRC cells was statistically correlated with a decrease of cell growth in vitro and in vivo, while c-MYC was identified as a target gene of miR-320b in CRC. Furthermore, it was found that up-regulation of c-Myc can attenuate the effects induced by miR-320b. CONCLUSIONS Our identification of c-MYC as a target gene of miR-320b provides new insights into the pathophysiology of CRC proliferation, and identifies miR-320b as a novel therapeutic target for the treatment of CRC.
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Affiliation(s)
- Hantao Wang
- Department of Colorectal Surgery, Changhai Hospital, Shanghai, 200433, China.
| | - Fuao Cao
- Department of Colorectal Surgery, Changhai Hospital, Shanghai, 200433, China.
| | - Xu Li
- Department of Colorectal Surgery, Changhai Hospital, Shanghai, 200433, China.
| | - Hua Miao
- Department of General Surgery, The First People's Hospital of Pinghu, Pinghu, 314200, Zhejiang Province, China.
| | - Jifu E
- Department of Colorectal Surgery, Changhai Hospital, Shanghai, 200433, China.
| | - Junjie Xing
- Department of Colorectal Surgery, Changhai Hospital, Shanghai, 200433, China.
| | - Chuan-Gang Fu
- Department of Colorectal Surgery, Changhai Hospital, Shanghai, 200433, China.
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Jackstadt R, Hermeking H. MicroRNAs as regulators and mediators of c-MYC function. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2015; 1849:544-53. [DOI: 10.1016/j.bbagrm.2014.04.003] [Citation(s) in RCA: 79] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2013] [Revised: 03/27/2014] [Accepted: 04/04/2014] [Indexed: 12/19/2022]
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Li G, Wang Y, Liu Y, Su Z, Liu C, Ren S, Deng T, Huang D, Tian Y, Qiu Y. miR-185-3p regulates nasopharyngeal carcinoma radioresistance by targeting WNT2B in vitro. Cancer Sci 2014; 105:1560-8. [PMID: 25297925 PMCID: PMC4317952 DOI: 10.1111/cas.12555] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2014] [Revised: 09/28/2014] [Accepted: 10/05/2014] [Indexed: 12/30/2022] Open
Abstract
Aberrant microRNA (miRNA) expression contributes to a series of malignant cancer behaviors, including radioresistance. Our previous study showed differential expression of miR-185-3p in post-radiation nasopharyngeal carcinoma (NPC) cells. To investigate the role of miR-185-3p in NPC radioresistance, CNE-2 and 5-8F cells were transfected with miR-185-3p mimic and miR-185-3p inhibitor, respectively. CCK-8 assay and colony formation experiment confirmed that the expression of miR-185-3p affected the radioresistance of NPC cells. A negative correlation between miR-185-3p and WNT2B expression was observed in NPC cells and tissues. Luciferase reporter assays confirmed that miR-185-3p directly targeted the coding region of WNT2B. Furthermore, we found radioresistance decreased in WNT2B-silenced NPC cells. Activation of the WNT2B/β-catenin pathway was accompanied by epithelial-mesenchymal transition biomarker changes in NPC. We concluded that miR-185-3p contributed to the radioresistance of NPC via modulation of WNT2B expression in vitro.
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Affiliation(s)
- Guo Li
- Department of Otolaryngology Head and Neck Surgery, Xiangya Hospital, Central South University, Changsha, China; Otolaryngology Major Disease Research Key Laboratory of Hunan Province, Changsha, Hunan, China
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Yang W, Yee AJ. Versican 3′-untranslated region (3′UTR) promotes dermal wound repair and fibroblast migration by regulating miRNA activity. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2014; 1843:1373-85. [DOI: 10.1016/j.bbamcr.2014.02.015] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2013] [Revised: 02/18/2014] [Accepted: 02/21/2014] [Indexed: 01/02/2023]
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Decrease expression of microRNA-744 promotes cell proliferation by targeting c-Myc in human hepatocellular carcinoma. Cancer Cell Int 2014; 14:58. [PMID: 24991193 PMCID: PMC4079640 DOI: 10.1186/1475-2867-14-58] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2013] [Accepted: 06/16/2014] [Indexed: 12/12/2022] Open
Abstract
Background MicroRNAs (miRNAs) are a large group of post-transcriptional gene regulators that potentially play a critical role in tumorigenesis. Increasing evidences indicate that miR-744 deregulated in numerous human cancers including hepatocellular carcinoma (HCC). However, its role in HCC carcinogenesis remains poorly defined. In this study, we investigated the roles of miR-744 in tumor growth of HCC. Methods Quantitative reverse-transcription polymerase chain reaction (qRT-PCR) was conducted to detect the expression of miR-744 and Immunohistochemistry was performed to detect expression of c-Myc in HCC specimens and adjacent normal tissues. The biological functions of miR-744 were determined by cell proliferation and cell cycle assay. Furthermore, cell lines transfected with miR-744 mimics were analyzed in vitro. Luciferase reporter assays was performed to confirm whether miR-744 regulated the expression of c-Myc. Results Our results showed that the expression of miR-744 was frequently down-regulated in both HCC tissues and cells. Furthermore, restoration of miR-744 in HCC cells was statistically correlated with decrease of cell growth and restored G1 accumulation. Luciferase assay and Western blot analysis revealed that c-Myc is a direct target of miR-744. Down-regulation of miR-744 and up-regulation of c-Myc were detected in HCC specimens compared with adjacent normal tissues. Moreover, restoration of miR-744 rescues c-Myc induced HCC proliferation. Conclusions Our data suggest that miR-744 exerts its tumor suppressor function by targeting c-Myc, leading to the inhibition of HCC cell growth. miR-744 may serve as a potentially useful target for the miRNA-based therapies of HCC in the future.
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MicroRNAs: potential regulators of renal development genes that contribute to CAKUT. Pediatr Nephrol 2014; 29:565-74. [PMID: 23996519 PMCID: PMC3944105 DOI: 10.1007/s00467-013-2599-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/11/2013] [Revised: 08/01/2013] [Accepted: 08/02/2013] [Indexed: 12/31/2022]
Abstract
Congenital anomalies of the kidney and urinary tract (CAKUT) are the leading cause of childhood chronic kidney disease (CKD). While mutations in several renal development genes have been identified as causes for CAKUT, most cases have not yet been linked to known mutations. Furthermore, the genotype-phenotype correlation is variable, suggesting that there might be additional factors that have an impact on the severity of CAKUT. MicroRNAs (miRNAs) are small non-coding RNAs that regulate gene expression at the post-transcriptional level, and are involved in many developmental processes. Although little is known about the function of specific miRNAs in kidney development, several have recently been shown to regulate the expression of, and/or are regulated by, crucial renal development genes present in other organ systems. In this review, we discuss how miRNA regulation of common developmental signaling pathways may be applicable to renal development. We focus on genes that are known to contribute to CAKUT in humans, for which miRNA interactions in other contexts have been identified, with miRNAs that are present in the kidney. We hypothesize that miRNA-mediated processes might play a role in kidney development through similar mechanisms, and speculate that genotypic variations in these small RNAs or their targets could be associated with CAKUT.
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Braun J, Misiak D, Busch B, Krohn K, Hüttelmaier S. Rapid identification of regulatory microRNAs by miTRAP (miRNA trapping by RNA in vitro affinity purification). Nucleic Acids Res 2014; 42:e66. [PMID: 24510096 PMCID: PMC4005655 DOI: 10.1093/nar/gku127] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
MicroRNAs (miRNAs) control gene expression at the post-transcriptional level. However, the identification of miRNAs regulating the fate of a specific messenger RNA remains limited due to the imperfect complementarity of miRNAs and targeted transcripts. Here, we describe miTRAP (miRNA trapping by RNA in vitro affinity purification), an advanced protocol of previously reported MS2-tethering approaches. MiTRAP allows the rapid identification of miRNAs targeting an in vitro transcribed RNA in cell lysates. Selective co-purification of regulatory miRNAs was confirmed for the MYC- as well as ZEB2-3′UTR, two well-established miRNA targets in vivo. Combined with miRNA-sequencing, miTRAP identified in addition to miRNAs reported to control MYC expression, 18 novel candidates including not in silico predictable miRNAs. The evaluation of 10 novel candidate miRNAs confirmed 3′UTR-dependent regulation of MYC expression as well as putative non-canonical targeting sites for the not in silico predictable candidates. In conclusion, miTRAP provides a rapid, cost-effective and easy-to-handle protocol allowing the identification of regulatory miRNAs for RNAs of choice in a cellular context of interest. Most notably, miTRAP not only identifies in silico predictable but also unpredictable miRNAs regulating the expression of a specific target RNA.
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Affiliation(s)
- Juliane Braun
- Division of Molecular Cell Biology, Institute of Molecular Medicine, Martin Luther University Halle-Wittenberg, Heinrich-Damerow-Strasse 1, 06120 Halle, Germany and Interdisciplinary Center for Clinical Research, University Leipzig, Liebigstrasse 21, 04103 Leipzig, Germany
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Tan Z, Jiang H, Wu Y, Xie L, Dai W, Tang H, Tang S. miR-185 is an independent prognosis factor and suppresses tumor metastasis in gastric cancer. Mol Cell Biochem 2013; 386:223-31. [PMID: 24352663 DOI: 10.1007/s11010-013-1860-y] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2013] [Accepted: 10/09/2013] [Indexed: 12/12/2022]
Abstract
miR-185 has been identified as an important factor in several cancers such as breast cancer, ovarial cancer, and prostate cancer. However, its effect and prognostic value in gastric cancer are still poorly known. In this study, we found that the expression levels of miR-185 were strongly downregulated in gastric cancer and associated with clinical stage and the presence of lymph node metastases. Moreover, miR-185 might independently predict OS and RFS in gastric cancer. We further found that upregulation of miR-185 inhibited the proliferation and metastasis of gastric cancer cells in vitro and in vivo. Taken together, our findings demonstrate that the miR-185 is important for gastric cancer initiation and progression and holds promise as a prognostic biomarker to predict survival and relapse in gastric cancer. It is also a potential therapeutic tool to improve clinical outcomes in the above disease.
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Affiliation(s)
- Zhiqin Tan
- Center for Gastric Cancer Research of Human Province, The First Affiliated Hospital, University of South China, 69 Chuanshan Road, Hengyang, 421001, People's Republic of China,
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Liao JM, Zhou X, Gatignol A, Lu H. Ribosomal proteins L5 and L11 co-operatively inactivate c-Myc via RNA-induced silencing complex. Oncogene 2013; 33:4916-23. [PMID: 24141778 PMCID: PMC4026346 DOI: 10.1038/onc.2013.430] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2013] [Revised: 08/27/2013] [Accepted: 09/13/2013] [Indexed: 01/22/2023]
Abstract
Oncogene MYC is highly expressed in many human cancers and functions as a global regulator of ribosome biogenesis. Previously, we reported that ribosomal protein (RP) L11 binds to c-Myc and inhibits its transcriptional activity in response to ribosomal stress. Here, we show that RPL5, co-operatively with RPL11, guides the RNA-induced silencing complex (RISC) to c-Myc mRNA and mediates the degradation of the mRNA, consequently leading to inhibition of c-Myc activity. Knocking down of RPL5 induced c-Myc expression at both mRNA and protein levels, whereas overexpression of RPL5 suppressed c-Myc expression and activity. Immunoprecipitation revealed that RPL5 binds to 3'UTR of c-Myc mRNA and two subunits of RISC, TRBP (HIV-1 TAR RNA-binding protein) and Ago2, mediating the targeting of c-Myc mRNA by miRNAs. Interestingly, RPL5 and RPL11 co-resided on c-Myc mRNA and suppressed c-Myc expression co-operatively. These findings uncover a mechanism by which these two RPs can co-operatively suppress c-Myc expression, allowing a tightly controlled ribosome biogenesis in cells.
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Affiliation(s)
- J-M Liao
- Department of Biochemistry and Molecular Biology and Tulane Cancer Center, Tulane University School of Medicine, New Orleans, LA, USA
| | - X Zhou
- Department of Biochemistry and Molecular Biology and Tulane Cancer Center, Tulane University School of Medicine, New Orleans, LA, USA
| | - A Gatignol
- Lady Davis Institute for Medical Research, McGill University AIDS Centre, Montréal, Québec, Canada
| | - H Lu
- Department of Biochemistry and Molecular Biology and Tulane Cancer Center, Tulane University School of Medicine, New Orleans, LA, USA
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Liao JM, Zhang Y, Liao W, Zeng SX, Su X, Flores ER, Lu H. IκB kinase β (IKKβ) inhibits p63 isoform γ (TAp63γ) transcriptional activity. J Biol Chem 2013; 288:18184-93. [PMID: 23589370 DOI: 10.1074/jbc.m113.466540] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Previously, we reported that IκB kinase-β(IKKβ) phosphorylates and stabilizes TAp63γ. However, the effect of this phosphorylation on TAp63γ transcriptional activity remains unclear. In this study, we showed that overexpression of IKKβ, but not its kinase dead mutant and IKKα, can surprisingly inhibit TAp63γ transcriptional activity as measured by luciferase assays and real-time PCR analyses of p63 target genes. This inhibition was impaired by ACHP, an IKKβ inhibitor, and enhanced by TNFα that activates IKKβ. Consistently, IKKβ inhibited the binding between TAp63γ and p300, a co-activator of TAp63γ, and consequently counteracted the positive effect of p300 on TAp63γ transcriptional activity. Through phosphorylation site prediction and mass spectrometry, we identified that Ser-4 and Ser-12 of p63 are IKKβ-targeting residues. As expected, IKKβ fails to suppress the transcriptional activity of the S4A/S12A double mutant p63. These results indicate that IKKβ can suppress TAp63γ activity by interfering with the interaction between TAp63γ and p300.
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Affiliation(s)
- Jun-Ming Liao
- Department of Biochemistry and Molecular Biology and Tulane Cancer Center, Tulane University School of Medicine, New Orleans, Louisiana 70112, USA
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Qu F, Cui X, Hong Y, Wang J, Li Y, Chen L, Liu Y, Gao Y, Xu D, Wang Q. MicroRNA-185 suppresses proliferation, invasion, migration, and tumorigenicity of human prostate cancer cells through targeting androgen receptor. Mol Cell Biochem 2013; 377:121-30. [PMID: 23417242 DOI: 10.1007/s11010-013-1576-z] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2012] [Accepted: 01/24/2013] [Indexed: 12/12/2022]
Abstract
Previous studies have shown that androgen receptor (AR) is involved in the progression of prostate cancer (CaP) by several mechanisms. However, how AR is regulated has not been fully understood. In this study, miR-185 was found to be down-regulated in clinical CaP samples. Targets prediction revealed that AR had putative complementary sequences to miR-185, which was confirmed by the following dual luciferase reporter assay. Overexpression of miR-185 could reduce the expression of AR protein but not mRNA in LNCaP cells. The proliferation of LNCaP cells was inhibited by overexpression of miR-185. Cell cycle analysis revealed cell cycle arrest at G0/G1 phase. The invasive and migration abilities of cells could also be suppressed by miR-185. Furthermore, miR-185 inhibited tumorigenicity in a CaP xenografts model. CDC6, one target of AR and an important regulatory molecule for cell cycle, was found to be down-regulated by overexpression of miR-185. Our findings suggest that miR-185 could function as a tumor-suppressor gene in CaP by directly targeting AR, and act as a potential therapeutic target for CaP.
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Affiliation(s)
- Fajun Qu
- Department of Urinary Surgery of Changzheng Hospital, Second Military Medical University, Shanghai, China
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Fan M, Li X, Jiang W, Huang Y, Li J, Wang Z. A long non-coding RNA, PTCSC3, as a tumor suppressor and a target of miRNAs in thyroid cancer cells. Exp Ther Med 2013; 5:1143-1146. [PMID: 23599737 PMCID: PMC3628718 DOI: 10.3892/etm.2013.933] [Citation(s) in RCA: 131] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2012] [Accepted: 01/29/2013] [Indexed: 02/07/2023] Open
Abstract
Papillary thyroid carcinoma susceptibility candidate 3 (PTCSC3) is a newly identified non-coding RNA, which is highly thyroid-specific. Dramatic downregulation in thyroid cancers suggests its potential roles in the occurrence and development of thyroid tumors. The present study aimed to investigate the effects of PTCSC3 on the biological features of thyroid cancer cells and to explore its possible function as a competing endogenous RNA to bind with miRNAs. Constructs containing the long non-coding RNA, PTCSC3, were transfected into various thyroid cancer cell lines (BCPAP, FTC133 and 8505C). Cell growth, cell cycle transition and apoptosis were measured by MTT assay and flow cytometry. In silico analysis was performed to identify the binding site of PTCSC3 for target miRNAs. Additionally, detection of putative miRNA by quantitative reverse transcription-polymerase chain reaction (RT-PCR) in thyroid cancer cells transfected with PTCSC3 was determined to confirm the interaction. Following transfection with PTCSC3, all three thyroid cancer cells originating from various pathological types of thyroid cancers demonstrated significant growth inhibition, cell cycle arrest and increased apoptosis. The top 20 miRNAs to have a potential interaction with PTCSC3 were identified, out of which miR-574-5p was selected to further confirm the inverse correlation with PTCSC3 in thyroid cancer cells in vitro. In the present study, PTCSC3 as a tumor suppressor was investigated as a competing endogenous RNA for miR-574-5p.
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Affiliation(s)
- Min Fan
- Department of General Surgery, Xiangya Hospital, Central South University, Changsha 410008; ; Department of Geriatrics, Xiangya Second Hospital, Central South University, Changsha 410011, P.R. China
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Xiang Y, Ma N, Wang D, Zhang Y, Zhou J, Wu G, Zhao R, Huang H, Wang X, Qiao Y, Li F, Han D, Wang L, Zhang G, Gao X. MiR-152 and miR-185 co-contribute to ovarian cancer cells cisplatin sensitivity by targeting DNMT1 directly: a novel epigenetic therapy independent of decitabine. Oncogene 2013; 33:378-86. [DOI: 10.1038/onc.2012.575] [Citation(s) in RCA: 160] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2012] [Revised: 10/09/2012] [Accepted: 10/23/2012] [Indexed: 12/15/2022]
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Wu X, Chesoni S, Rondeau G, Tempesta C, Patel R, Charles S, Daginawala N, Zucconi BE, Kishor A, Xu G, Shi Y, Li ML, Irizarry-Barreto P, Welsh J, Wilson GM, Brewer G. Combinatorial mRNA binding by AUF1 and Argonaute 2 controls decay of selected target mRNAs. Nucleic Acids Res 2013; 41:2644-58. [PMID: 23303783 PMCID: PMC3575833 DOI: 10.1093/nar/gks1453] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
The RNA-binding protein AUF1 binds AU-rich elements in 3′-untranslated regions to regulate mRNA degradation and/or translation. Many of these mRNAs are predicted microRNA targets as well. An emerging theme in post-transcriptional control of gene expression is that RNA-binding proteins and microRNAs co-regulate mRNAs. Recent experiments and bioinformatic analyses suggest this type of co-regulation may be widespread across the transcriptome. Here, we identified mRNA targets of AUF1 from a complex pool of cellular mRNAs and examined a subset of these mRNAs to explore the links between RNA binding and mRNA degradation for both AUF1 and Argonaute 2 (AGO2), which is an essential effector of microRNA-induced gene silencing. Depending on the specific mRNA examined, AUF1 and AGO2 binding is proportional/cooperative, reciprocal/competitive or independent. For most mRNAs in which AUF1 affects their decay rates, mRNA degradation requires AGO2. Thus, AUF1 and AGO2 present mRNA-specific allosteric binding relationships for co-regulation of mRNA degradation.
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Affiliation(s)
- Xiangyue Wu
- Department of Biochemistry and Molecular Biology, UMDNJ-Robert Wood Johnson Medical School, Piscataway, NJ 08854, USA
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Yamada Y, Hidaka H, Seki N, Yoshino H, Yamasaki T, Itesako T, Nakagawa M, Enokida H. Tumor-suppressive microRNA-135a inhibits cancer cell proliferation by targeting the c-MYC oncogene in renal cell carcinoma. Cancer Sci 2012; 104:304-12. [PMID: 23176581 DOI: 10.1111/cas.12072] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2012] [Revised: 11/02/2012] [Accepted: 11/20/2012] [Indexed: 12/30/2022] Open
Abstract
Recently, many studies have suggested that microRNAs (miRNAs) are involved in cancer cell development, invasion, and metastasis of various types of human cancers. In a previous study, miRNA expression signatures from renal cell carcinoma (RCC) revealed that expression of microRNA-135a (miR-135a) was significantly reduced in cancerous tissues. The aim of this study was to investigate the functional significance of miR-135a and to identify miR-135a-mediated molecular pathways in RCC cells. Restoration of mature miR-135a significantly inhibited cancer cell proliferation and induced G0 /G1 arrest in the RCC cell lines caki2 and A498, suggesting that miR-135a functioned as a potential tumor suppressor. We then examined miR-135a-mediated molecular pathways using genome-wide gene expression analysis and in silico analysis. A total of 570 downregulated genes were identified in miR-135a transfected RCC cell lines. To investigate the biological significance of potential miR-135a-mediated pathways, we classified putative miR-135a-regulated genes according to the Kyoto Encyclopedia of Genes and Genomics pathway database. From our in silico analysis, 25 pathways, including the cell cycle, pathways in cancer, DNA replication, and focal adhesion, were significantly regulated by miR-135a in RCC cells. Moreover, based on the results of this analysis, we investigated whether miR-135a targeted the c-MYC gene in RCC. Gain-of-function and luciferase reporter assays showed that c-MYC was directly regulated by miR-135a in RCC cells. Furthermore, c-MYC expression was significantly upregulated in RCC clinical specimens. Our data suggest that elucidation of tumor-suppressive miR-135a-mediated molecular pathways could reveal potential therapeutic targets in RCC.
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Affiliation(s)
- Yasutoshi Yamada
- Department of Urology, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
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Global effect of inauhzin on human p53-responsive transcriptome. PLoS One 2012; 7:e52172. [PMID: 23284922 PMCID: PMC3528779 DOI: 10.1371/journal.pone.0052172] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2012] [Accepted: 11/15/2012] [Indexed: 12/19/2022] Open
Abstract
Background Previously, we reported that Inauhzin (INZ) induces p53 activity and suppresses tumor growth by inhibiting Sirt1. However, it remains unknown whether INZ may globally affect p53-dependent gene expression or not. Herein, we have conducted microarray and real-time PCR analyses of gene expression to determine the global effect of INZ on human p53-responsive transcriptome. Methodology/Principal Findings In this study, we conducted microarray analysis followed by PCR validation of general gene expression in HCT116p53+/+ and HCT116p53−/− cells treated with or without INZ. Microarray data showed that 324 genes were up-regulated by ≥2.3-fold and 266 genes were down-regulated by ≥2-fold in response to INZ treatment in a p53-dependent manner. GO analysis for these genes further revealed that INZ affects several biological processes, including apoptosis (GO:0006915), cell cycle (GO:0007049), immune system process (GO:0002376), and cell adhesion (GO:0007155), which are in line with p53 functions in cells. Also, pathway and STRING analyses of these genes indicated that the p53-signaling pathway is the most significant pathway responsive to INZ treatment as predicted, since a number of these p53 target genes have been previously reported and some of them were validated by RT-qPCR. Finally, among the 9 tested and highly expressed genes, ACBD4, APOBEC3C, and FLJ14327 could be novel p53 target genes, for they were up-regulated by INZ in HCT116p53+/+ cells, but not in HCT116p53−/− cells. Conclusions/Significance From our whole genome microarray analysis followed by validation with RT-qPCR, we found that INZ can indeed induce the expression of p53 target genes at a larger scale or globally. Our findings not only verify that INZ indeed activates the p53 signaling pathway, but also provide useful information for identifying novel INZ and/or p53 targets. The global effect of INZ on human p53-responsive transcriptome could also be instrumental to the future design of INZ clinical trials.
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Daneshvar K, Nath S, Khan A, Shover W, Richardson C, Goodliffe JM. MicroRNA miR-308 regulates dMyc through a negative feedback loop in Drosophila. Biol Open 2012; 2:1-9. [PMID: 23336071 PMCID: PMC3545263 DOI: 10.1242/bio.20122725] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2012] [Accepted: 09/19/2012] [Indexed: 12/29/2022] Open
Abstract
The abundance of Myc protein must be exquisitely controlled to avoid growth abnormalities caused by too much or too little Myc. An intriguing mode of regulation exists in which Myc protein itself leads to reduction in its abundance. We show here that dMyc binds to the miR-308 locus and increases its expression. Using our gain-of-function approach, we show that an increase in miR-308 causes a destabilization of dMyc mRNA and reduced dMyc protein levels. In vivo knockdown of miR-308 confirmed the regulation of dMyc levels in embryos. This regulatory loop is crucial for maintaining appropriate dMyc levels and normal development. Perturbation of the loop, either by elevated miR-308 or elevated dMyc, caused lethality. Combining elevated levels of both, therefore restoring balance between miR-308 and dMyc levels, resulted in lower apoptotic activity and suppression of lethality. These results reveal a sensitive feedback mechanism that is crucial to prevent the pathologies caused by abnormal levels of dMyc.
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Affiliation(s)
- Kaveh Daneshvar
- Department of Biology, University of North Carolina at Charlotte , Charlotte, NC 28223 , USA ; Gastrointestinal Unit, Massachusetts General Hospital , Harvard Medical School, 55 Fruit Street, Boston, MA 02114 , USA
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Takwi AAL, Li Y, Becker Buscaglia LE, Zhang J, Choudhury S, Park AK, Liu M, Young KH, Park WY, Martin RCG, Li Y. A statin-regulated microRNA represses human c-Myc expression and function. EMBO Mol Med 2012; 4:896-909. [PMID: 22887866 PMCID: PMC3491823 DOI: 10.1002/emmm.201101045] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2011] [Revised: 06/04/2012] [Accepted: 06/06/2012] [Indexed: 12/19/2022] Open
Abstract
c-Myc dysregulation is one of the most common abnormalities found in human cancer. MicroRNAs (miRNAs) are functionally intertwined with the c-Myc network as multiple miRNAs are regulated by c-Myc, while others directly suppress c-Myc expression. In this work, we identified miR-33b as a primate-specific negative regulator of c-Myc. The human miR-33b gene is located at 17p11.2, a genomic locus frequently lost in medulloblastomas, of which a subset displays c-Myc overproduction. Through a small-scale screening with drugs approved by the US Food and Drug Administration (FDA), we found that lovastatin upregulated miR-33b expression, reduced cell proliferation and impaired c-Myc expression and function in miR-33b-positive medulloblastoma cells. In addition, a low dose of lovastatin treatment at a level comparable to approved human oral use reduced tumour growth in mice orthotopically xenografted with cells carrying miR-33b, but not with cells lacking miR-33b. This work presents a highly promising therapeutic option, using drug repurposing and a miRNA as a biomarker, against cancers that overexpress c-Myc.
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Affiliation(s)
- Apana A L Takwi
- Department of Biochemistry and Molecular Biology, School of Medicine, University of LouisvilleLouisville, KY, USA
| | - Yan Li
- Division of Surgical Oncology, Department of Surgery, School of Medicine, University of LouisvilleLouisville, KY, USA
| | - Lindsey E Becker Buscaglia
- Department of Biochemistry and Molecular Biology, School of Medicine, University of LouisvilleLouisville, KY, USA
| | - Jingwen Zhang
- Department of Medicine, School of Medicine, University of LouisvilleLouisville, KY, USA
| | - Saibyasachi Choudhury
- Department of Biochemistry and Molecular Biology, School of Medicine, University of LouisvilleLouisville, KY, USA
| | - Ae Kyung Park
- Department of Pharmacy, Sunchon National University College of PharmacySunchon, Korea
| | - Mofang Liu
- State Key Laboratory of Molecular Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of SciencesShanghai, China
| | - Ken H Young
- Department of Hematopathology, The University of Texas MD Anderson Cancer CenterHouston, TX, USA
| | - Woong-Yang Park
- Department of Biomedical Sciences, Seoul National University, College of MedicineSeoul, Korea
| | - Robert C G Martin
- Division of Surgical Oncology, Department of Surgery, School of Medicine, University of LouisvilleLouisville, KY, USA
| | - Yong Li
- Department of Biochemistry and Molecular Biology, School of Medicine, University of LouisvilleLouisville, KY, USA
- *Corresponding author: Tel: +1 502 8527551; Fax: +1 502 8526222; E-mail:
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Liao JM, Zhou X, Zhang Y, Lu H. MiR-1246: a new link of the p53 family with cancer and Down syndrome. Cell Cycle 2012; 11:2624-30. [PMID: 22751441 PMCID: PMC3409007 DOI: 10.4161/cc.20809] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Since the discovery of miRNAs, a number of miRNAs have been identified as p53's transcriptional targets. Most of them are involved in regulation of the known p53 functions, such as cell cycle, apoptosis and senescence. Our recent study revealed miR-1246 as a novel target of p53 and its analogs p63 and p73 to suppress the expression of DYRK1A and consequently activate NFAT, both of which are associated with Down syndrome and possibly with tumorigenesis. This finding suggests that miR-1246 might serve as a likely link of the p53 family with Down syndrome. Here, we provide some prospective views on the potential role of the p53 family in Down syndrome via miR-1246 and propose a new p53-miR-1246-DYRK1A-NFAT pathway in cancer.
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Affiliation(s)
- Jun-Ming Liao
- Department of Biochemistry & Molecular Biology and Tulane Cancer Center; Tulane University School of Medicine; New Orleans, LA USA
| | - Xiang Zhou
- Department of Biochemistry & Molecular Biology and Tulane Cancer Center; Tulane University School of Medicine; New Orleans, LA USA
| | - Yu Zhang
- Department of Obstetrics and Gynecology; Xiangya Hospital; Central South University; Hunan, China
| | - Hua Lu
- Department of Biochemistry & Molecular Biology and Tulane Cancer Center; Tulane University School of Medicine; New Orleans, LA USA
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Matoulkova E, Michalova E, Vojtesek B, Hrstka R. The role of the 3' untranslated region in post-transcriptional regulation of protein expression in mammalian cells. RNA Biol 2012; 9:563-76. [PMID: 22614827 DOI: 10.4161/rna.20231] [Citation(s) in RCA: 249] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
The untranslated regions (UTRs) at the 3'end of mRNA transcripts contain important sequences that influence the fate of mRNA and thus proteosynthesis. In this review, we summarize the information known to date about 3'end processing, sequence characteristics including related binding proteins and the role of 3'UTRs in several selected signaling pathways to delineate their importance in the regulatory processes in mammalian cells. In addition to reviewing recent advances in the more well known aspects, such as cleavage and polyadenylation processes that influence mRNA stability and location, we concentrate on some newly emerging concepts of the role of the 3'UTR, including alternative polyadenylation sites in relation to proliferation and differentiation and the recognition of the multi-functional properties of non-coding RNAs, including miRNAs that commonly target the 3'UTR. The emerging picture is of a highly complex set of regulatory systems that include autoregulation, cooperativity and competition to fine tune proteosynthesis in context-dependent manners.
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Hwang IY, Roe JS, Seol JH, Kim HR, Cho EJ, Youn HD. pVHL-mediated transcriptional repression of c-Myc by recruitment of histone deacetylases. Mol Cells 2012; 33:195-201. [PMID: 22286234 PMCID: PMC3887712 DOI: 10.1007/s10059-012-2268-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2011] [Accepted: 11/29/2011] [Indexed: 01/22/2023] Open
Abstract
The biological functions of Myc are to regulate cell growth,apoptosis, cell differentiation and stem-cell self-renewal. Abnormal accumulation of c-Myc is able to induce excessive proliferation of normal cells. von Hippel-Lindau protein(pVHL) is a key regulator of hypoxia-inducible factor 1α(HIF1α), thus accumulation and hyperactivation of HIF1α is the most prominent feature of VHL-mutated renal cell carcinoma. Interestingly, the Myc pathway is reported to be activated in renal cell carcinoma even though the precise molecular mechanism still remains to be established. Here, we demonstrated that pVHL locates at the c-Myc promoter region through physical interaction with Myc. Furthermore, pVHL reinforces HDAC1/2 recruitment to the Myc promoter, which leads to the auto-suppression of Myc. Therefore, one possible mechanism of Myc auto-suppression by pVHL entails removing histone acetylation. Our study identifies a novel mechanism for pVHL-mediated negative regulation of c-Myc transcription.
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Affiliation(s)
- In-Young Hwang
- National Research Laboratory for Metabolic Checkpoint, Departments of Biomedical Sciences and Biochemistry and Molecular Biology, Seoul National University College of Medicine, Seoul 110-799,
Korea
| | - Jae-Seok Roe
- National Research Laboratory for Metabolic Checkpoint, Departments of Biomedical Sciences and Biochemistry and Molecular Biology, Seoul National University College of Medicine, Seoul 110-799,
Korea
| | - Ja-Hwan Seol
- National Research Laboratory for Chromatin Dynamics, School of Pharmacy, Sungkyunkwan University, Suwon 440-746,
Korea
| | - Hwa-Ryeon Kim
- National Research Laboratory for Metabolic Checkpoint, Departments of Biomedical Sciences and Biochemistry and Molecular Biology, Seoul National University College of Medicine, Seoul 110-799,
Korea
| | - Eun-Jung Cho
- National Research Laboratory for Chromatin Dynamics, School of Pharmacy, Sungkyunkwan University, Suwon 440-746,
Korea
| | - Hong-Duk Youn
- National Research Laboratory for Metabolic Checkpoint, Departments of Biomedical Sciences and Biochemistry and Molecular Biology, Seoul National University College of Medicine, Seoul 110-799,
Korea
- World Class University (WCU) Department of Molecular Medicine and Biopharmaceutical Sciences, Graduate School of Convergence Science, Seoul National University, Seoul 151-742,
Korea
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42
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Jin Y, Wang C, Liu X, Mu W, Chen Z, Yu D, Wang A, Dai Y, Zhou X. Molecular characterization of the microRNA-138-Fos-like antigen 1 (FOSL1) regulatory module in squamous cell carcinoma. J Biol Chem 2011; 286:40104-9. [PMID: 21969367 DOI: 10.1074/jbc.c111.296707] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
MicroRNA-138 is one of the most frequently down-regulated microRNAs in cancer. We recently identified 51 candidate targets of microRNA-138 (Jiang, L., Dai, Y., Liu, X., Wang, C., Wang, A., Chen, Z., Heidbreder, C. E., Kolokythas, A., and Zhou, X. (2011) Hum. Genet. 129, 189-197). Among these candidates, Fos-like antigen 1 (FOSL1) is a member of Fos gene family and is a known proto-oncogene. In this study, we first confirmed the microRNA-138-mediated down-regulation of FOSL1 in squamous cell carcinoma cell lines. We then demonstrated the effect of this microRNA-138-FOSL1 regulatory module on downstream genes (homolog of Snail 2 (Snai2) expression and the Snai2-mediated repression of E-cadherin expression), as well as its contributions to tumorigenesis. The microRNA-138-directed recruitment of FOSL1 mRNA to the RNAi-induced silencing complex was confirmed by a ribonucleoprotein-immunoprecipitation assay. Three canonical and three high affinity non-canonical microRNA-138 (miR-138) targeting sites were identified on the FOSL1 mRNA: one in the 5'-UTR, three overlapping sites in the coding sequences, and two overlapping sites in the 3'-UTR. The direct targeting of miR-138 to these sites was confirmed using luciferase reporter gene assays. In summary, we describe an important microRNA regulatory module, which may play an important role in cancer initiation and progression. Our results also provide evidence that microRNAs target both canonical and non-canonical targeting sites located in all areas of the mRNA molecule (e.g. 5'-UTR, coding sequences, and 3'-UTR).
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Affiliation(s)
- Yi Jin
- Center for Molecular Biology of Oral Diseases, College of Dentistry, University of Illinois, Chicago, Illinois 60612, USA
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Aldred SF, Collins P, Trinklein N. Identifying targets of human micrornas with the LightSwitch Luciferase Assay System using 3'UTR-reporter constructs and a microRNA mimic in adherent cells. J Vis Exp 2011:3343. [PMID: 21988797 DOI: 10.3791/3343] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
MicroRNAs (miRNAs) are important regulators of gene expression and play a role in many biological processes. More than 700 human miRNAs have been identified so far with each having up to hundreds of unique target mRNAs. Computational tools, expression and proteomics assays, and chromatin-immunoprecipitation-based techniques provide important clues for identifying mRNAs that are direct targets of a particular miRNA. In addition, 3'UTR-reporter assays have become an important component of thorough miRNA target studies because they provide functional evidence for and quantitate the effects of specific miRNA-3'UTR interactions in a cell-based system. To enable more researchers to leverage 3'UTR-reporter assays and to support the scale-up of such assays to high-throughput levels, we have created a genome-wide collection of human 3'UTR luciferase reporters in the highly-optimized LightSwitch Luciferase Assay System. The system also includes synthetic miRNA target reporter constructs for use as positive controls, various endogenous 3'UTR reporter constructs, and a series of standardized experimental protocols. Here we describe a method for co-transfection of individual 3'UTR-reporter constructs along with a miRNA mimic that is efficient, reproducible, and amenable to high-throughput analysis.
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