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Chi Y, Zhou D. MicroRNAs in colorectal carcinoma--from pathogenesis to therapy. JOURNAL OF EXPERIMENTAL & CLINICAL CANCER RESEARCH : CR 2016; 35:43. [PMID: 26964533 PMCID: PMC4787051 DOI: 10.1186/s13046-016-0320-4] [Citation(s) in RCA: 93] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/16/2015] [Accepted: 03/07/2016] [Indexed: 12/12/2022]
Abstract
Background Acting as inflammatory mediators, tumor oncogenes or suppressors, microRNAs are involved in cell survival, death, epithelial–mesenchymal transition and metastasis, etc. Investigating the communication between microRNAs and tumorigenesis is critical to our understanding of the pathogenesis of multiple disease states. Main body Currently, colorectal carcinoma (CRC), one of the most common malignancies worldwide, has a poor prognosis due to lack of an effective therapeutic option. Increasing evidence has identified altered profiles and regulatory potential of microRNAs in conditions related to environmentally-caused colorectal inflammation and colitis-associated cancer. Many studies have shed light on a more thorough understanding of the function and distribution of microRNAs in CRC initiation and emergence. However, the molecular mechanisms by which microRNAs modulate cellular processes still need to be further elucidated and may offer a foundation for evaluating microRNA-based therapeutic potential for CRC in both animal models and clinical trials. Conclusion In this review, the roles and mechanisms of microRNAs involved in CRC from pathogenesis to therapy are summarized and discussed, which may provide more useful hints for CRC prevention and therapy.
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Affiliation(s)
- Yudan Chi
- Vaccine Research Center, Key Laboratory of Molecular Virology & Immunology, Institut Pasteur of Shanghai, Chinese Academy of Sciences, Shanghai, 200031, China
| | - Dongming Zhou
- Vaccine Research Center, Key Laboratory of Molecular Virology & Immunology, Institut Pasteur of Shanghai, Chinese Academy of Sciences, Shanghai, 200031, China.
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Yin Y, Song M, Gu B, Qi X, Hu Y, Feng Y, Liu H, Zhou L, Bian Z, Zhang J, Zuo X, Huang Z. Systematic analysis of key miRNAs and related signaling pathways in colorectal tumorigenesis. Gene 2016; 578:177-84. [PMID: 26692142 DOI: 10.1016/j.gene.2015.12.015] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2015] [Revised: 11/10/2015] [Accepted: 12/08/2015] [Indexed: 01/01/2023]
Affiliation(s)
- Yuan Yin
- Wuxi Oncology Institute, Affiliated Hospital of Jiangnan University, Wuxi, Jiangsu 214062, China
| | - Mingxu Song
- Wuxi Oncology Institute, Affiliated Hospital of Jiangnan University, Wuxi, Jiangsu 214062, China
| | - Bing Gu
- Department of Laboratory Medicine, Affiliated Hospital of Xuzhou Medical College, Xuzhou, Jiangsu 221002, China; Medical Technology Institute of Xuzhou Medical College, Xuzhou, Jiangsu 221002, China
| | - Xiaowei Qi
- Department of Pathology, Affiliated Hospital of Jiangnan University, Wuxi, Jiangsu 214062, China
| | - Yaling Hu
- Wuxi Oncology Institute, Affiliated Hospital of Jiangnan University, Wuxi, Jiangsu 214062, China
| | - Yuyang Feng
- Wuxi Oncology Institute, Affiliated Hospital of Jiangnan University, Wuxi, Jiangsu 214062, China
| | - Heyong Liu
- Wuxi Oncology Institute, Affiliated Hospital of Jiangnan University, Wuxi, Jiangsu 214062, China
| | - Leyuan Zhou
- Wuxi Oncology Institute, Affiliated Hospital of Jiangnan University, Wuxi, Jiangsu 214062, China
| | - Zehua Bian
- Wuxi Oncology Institute, Affiliated Hospital of Jiangnan University, Wuxi, Jiangsu 214062, China
| | - Jiwei Zhang
- Wuxi Oncology Institute, Affiliated Hospital of Jiangnan University, Wuxi, Jiangsu 214062, China
| | - Xianbo Zuo
- Institute of Dermatology and Department of Dermatology, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, China
| | - Zhaohui Huang
- Wuxi Oncology Institute, Affiliated Hospital of Jiangnan University, Wuxi, Jiangsu 214062, China.
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Abstract
Growth of atherosclerotic plaque requires neovascularization (angiogenesis). To elucidate the involvement of angiotensin II (Ang II) in angiogenesis, we performed gene microarray and microRNA (miRNA) polymerase chain reaction array analyses on human coronary artery endothelial cells exposed to moderate concentration of Ang II for 2 and 12 hours. At 12, but not 2, hours, cultures treated with Ang II exhibited shifts in transcriptional activity involving 267 genes (>1.5-fold difference; P < 0.05). Resulting transcriptome was most significantly enriched for genes associated with blood vessel development, angiogenesis, and regulation of proliferation. Majority of upregulated genes implicated in angiogenesis shared a commonality of being either regulators (HES1, IL-18, and CXCR4) or targets (ADM, ANPEP, HES1, KIT, NOTCH4, PGF, and SOX18) of STAT3. In line with these findings, STAT3 inhibition attenuated Ang II-dependent stimulation of tube formation in Matrigel assay. Expression analysis of miRNAs transcripts revealed that the pattern of differential expression for miRNAs was largely consistent with proangiogenic response with a prominent theme of upregulation of miRs targeting PTEN (miR-19b-3p, miR-21-5p, 23b-3p, and 24-3p), many of which are directly or indirectly STAT3 dependent. We conclude that STAT3 signaling may be an intrinsic part of Ang II-mediated proangiogenic response in human endothelial cells.
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104
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Donzelli S, Cioce M, Muti P, Strano S, Yarden Y, Blandino G. MicroRNAs: Non-coding fine tuners of receptor tyrosine kinase signalling in cancer. Semin Cell Dev Biol 2016; 50:133-42. [PMID: 26773212 DOI: 10.1016/j.semcdb.2015.12.020] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Accepted: 12/23/2015] [Indexed: 12/19/2022]
Abstract
Emerging evidence point to a crucial role for non-coding RNAs in modulating homeostatic signaling under physiological and pathological conditions. MicroRNAs, the best-characterized non-coding RNAs to date, can exquisitely integrate spatial and temporal signals in complex networks, thereby confer specificity and sensitivity to tissue response to changes in the microenvironment. MicroRNAs appear as preferential partners for Receptor Tyrosine Kinases (RTKs) in mediating signaling under stress conditions. Stress signaling can be especially relevant to disease. Here we focus on the ability of microRNAs to mediate RTK signaling in cancer, by acting as both tumor suppressors and oncogenes. We will provide a few general examples of microRNAs modulating specific tumorigenic functions downstream of RTK signaling and integrate oncogenic signals from multiple RTKs. A special focus will be devoted to epidermal growth factor receptor (EGFR) signaling, a system offering relatively rich information. We will explore the role of selected microRNAs as bidirectional modulators of EGFR functions in cancer cells. In addition, we will present the emerging evidence for microRNAs being specifically modulated by oncogenic EGFR mutants and we will discuss how this impinges on EGFRmut driven chemoresistance, which fits into the tumor heterogeneity-driven cancer progression. Finally, we discuss how other non-coding RNA species are emerging as important modulators of cancer progression and why the scenario depicted herein is destined to become increasingly complex in the future.
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Affiliation(s)
- Sara Donzelli
- Translational Oncogenomics, Regina Elena National Cancer Institute, 00144 Rome, Italy
| | - Mario Cioce
- Translational Oncogenomics, Regina Elena National Cancer Institute, 00144 Rome, Italy
| | - Paola Muti
- Dept of Oncology, McMaster University, Hamilton, On L8V1C3, Canada
| | - Sabrina Strano
- Molecular Chemoprevention Units, Regina Elena National Cancer Institute, 00144 Rome, Italy; Dept of Oncology, McMaster University, Hamilton, On L8V1C3, Canada
| | - Yosef Yarden
- Dept of Biological Regulation, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Giovanni Blandino
- Translational Oncogenomics, Regina Elena National Cancer Institute, 00144 Rome, Italy; Dept of Oncology, McMaster University, Hamilton, On L8V1C3, Canada.
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105
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Yan LX, Liu YH, Xiang JW, Wu QN, Xu LB, Luo XL, Zhu XL, Liu C, Xu FP, Luo DL, Mei P, Xu J, Zhang KP, Chen J. PIK3R1 targeting by miR-21 suppresses tumor cell migration and invasion by reducing PI3K/AKT signaling and reversing EMT, and predicts clinical outcome of breast cancer. Int J Oncol 2015; 48:471-84. [PMID: 26676464 PMCID: PMC4725461 DOI: 10.3892/ijo.2015.3287] [Citation(s) in RCA: 78] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2015] [Accepted: 11/22/2015] [Indexed: 01/06/2023] Open
Abstract
We have previously shown that dysregulation of miR-21 functioned as an oncomiR in breast cancer. The aim of the present study was to elucidate the mechanisms by which miR-21 regulate breast tumor migration and invasion. We applied pathway analysis on genome microarray data and target-predicting algorithms for miR-21 target screening, and used luciferase reporting assay to confirm the direct target. Thereafter, we investigated the function of the target gene phosphoinositide-3-kinase, regulatory subunit 1 (α) (PIK3R1), and detected PIK3R1 coding protein (p85α) by immunohistochemistry and miR-21 by RT-qPCR on 320 archival paraffin-embedded tissues of breast cancer to evaluate the correlation of their expression with prognosis. First, we found that PIK3R1 suppressed growth, invasiveness, and metastatic properties of breast cancer cells. Next, we identified the PIK3R1 as a direct target of miR-21 and showed that it was negatively regulated by miR-21. Furthermore, we demonstrated that p85α overexpression phenocopied the suppression effects of antimiR-21 on breast cancer cell growth, migration and invasion, indicating its tumor suppressor role in breast cancer. On the contrary, PIK3R1 knockdown abrogated antimiR‑21-induced effect on breast cancer cells. Notably, antimiR-21 induction increased p85α, accompanied by decreased p-AKT level. Besides, antimiR-21/PIK3R1-induced suppression of invasiveness in breast cancer cells was mediated by reversing epithelial-mesenchymal transition (EMT). p85α downregulation was found in 25 (7.8%) of the 320 breast cancer patients, and was associated with inferior 5-year disease-free survival (DFS) and overall survival (OS). Taken together, we provide novel evidence that miR-21 knockdown suppresses cell growth, migration and invasion partly by inhibiting PI3K/AKT activation via direct targeting PIK3R1 and reversing EMT in breast cancer. p85α downregulation defined a specific subgroup of breast cancer with shorter 5-year DFS and OS, which may require more aggressive treatment.
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Affiliation(s)
- Li-Xu Yan
- Department of Pathology, Guangdong General Hospital, Guangdong Academy of Medical Science, Guangzhou, Guangdong, P.R. China
| | - Yan-Hui Liu
- Department of Pathology, Guangdong General Hospital, Guangdong Academy of Medical Science, Guangzhou, Guangdong, P.R. China
| | - Jian-Wen Xiang
- Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, Guangdong, P.R. China
| | - Qi-Nian Wu
- The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, P.R. China
| | - Lei-Bo Xu
- Sun Yat-sen Memorial Hospital, SunYat-sen University, Guangzhou, Guangdong, P.R. China
| | - Xin-Lan Luo
- Department of Pathology, Guangdong General Hospital, Guangdong Academy of Medical Science, Guangzhou, Guangdong, P.R. China
| | - Xiao-Lan Zhu
- Department of Pathology, Guangdong General Hospital, Guangdong Academy of Medical Science, Guangzhou, Guangdong, P.R. China
| | - Chao Liu
- Department of Pathology, Guangdong General Hospital, Guangdong Academy of Medical Science, Guangzhou, Guangdong, P.R. China
| | - Fang-Ping Xu
- Department of Pathology, Guangdong General Hospital, Guangdong Academy of Medical Science, Guangzhou, Guangdong, P.R. China
| | - Dong-Lan Luo
- Department of Pathology, Guangdong General Hospital, Guangdong Academy of Medical Science, Guangzhou, Guangdong, P.R. China
| | - Ping Mei
- Department of Pathology, Guangdong General Hospital, Guangdong Academy of Medical Science, Guangzhou, Guangdong, P.R. China
| | - Jie Xu
- Department of Pathology, Guangdong General Hospital, Guangdong Academy of Medical Science, Guangzhou, Guangdong, P.R. China
| | - Ke-Ping Zhang
- Department of Pathology, Guangdong General Hospital, Guangdong Academy of Medical Science, Guangzhou, Guangdong, P.R. China
| | - Jie Chen
- Department of Pathology, Guangdong General Hospital, Guangdong Academy of Medical Science, Guangzhou, Guangdong, P.R. China
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106
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Thomas J, Ohtsuka M, Pichler M, Ling H. MicroRNAs: Clinical Relevance in Colorectal Cancer. Int J Mol Sci 2015; 16:28063-76. [PMID: 26602923 PMCID: PMC4691027 DOI: 10.3390/ijms161226080] [Citation(s) in RCA: 95] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2015] [Revised: 10/27/2015] [Accepted: 11/13/2015] [Indexed: 12/27/2022] Open
Abstract
Colorectal cancer is one of the most common cancer diagnoses and causes of mortality worldwide. MicroRNAs are a class of small, non-coding regulatory RNAs that have shown strong associations with colorectal cancer. Through the repression of target messenger RNAs, microRNAs modulate many cellular pathways, such as those involved in cell proliferation, apoptosis, and differentiation. The utilization of microRNAs has shown significant promise in the diagnosis and prognosis of colorectal cancer, owing to their unique expression profile associations with cancer types and malignancies. Moreover, microRNA therapeutics with mimics or antagonists show great promise in preclinical studies, which encourages further development of their clinical use for colorectal cancer patients. The unique ability of microRNAs to affect multiple downstream pathways represents a novel approach for cancer therapy. Although still early in its development, we believe that microRNAs can be used in the near future as biomarkers and therapeutic targets for colorectal cancer.
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Affiliation(s)
- Joe Thomas
- Department of Experimental Therapeutics, The University of Texas MD Anderson Cancer Center, Houston, TX 77054, USA.
| | - Masahisa Ohtsuka
- Department of Experimental Therapeutics, The University of Texas MD Anderson Cancer Center, Houston, TX 77054, USA.
| | - Martin Pichler
- Department of Experimental Therapeutics, The University of Texas MD Anderson Cancer Center, Houston, TX 77054, USA.
- Division of Oncology, Medical University of Graz, 8010 Graz, Austria.
| | - Hui Ling
- Department of Experimental Therapeutics, The University of Texas MD Anderson Cancer Center, Houston, TX 77054, USA.
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107
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Oncogenic potential of TSTA3 in breast cancer and its regulation by the tumor suppressors miR-125a-5p and miR-125b. Tumour Biol 2015; 37:4963-72. [PMID: 26531722 DOI: 10.1007/s13277-015-4178-4] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2015] [Accepted: 10/01/2015] [Indexed: 10/22/2022] Open
Abstract
TSTA3 participates in enzyme metabolism and affects glycosylation processes, and abnormal glycosylation influences the malignant transformation of cells and tumor development. However, studies have not examined the molecular biological function of TSTA3 in breast cancer (BC). The expression of TSTA3 was examined in BC tissues and cell lines. Kaplan-Meier survival tests and Cox regression were used to analyze prognosis. TSTA3 depletion was used to analyze cell function. The upstream miRNAs of TSTA3 were predicted, and the downstream target gene was analyzed using a RT2 Profiler™ PCR array. Our results show that TSTA3 was highly expressed in BC tissues and cells and was correlated with poor survival. The expression of TSTA3 was correlated with the TNM status (P < 0.01) and served as an independent prognostic factor (P = 0.041). TSTA3-siRNA decreased cell invasion and proliferation in vitro. miR-125a-5p and miR-125b are upstream targets of TSTA3, and a PCR array revealed that TSTA3 affects the CXCR4-CXCL12 genes. The findings suggest that miR-125a-5p/miR-125b suppress the expression of TSTA3, which controls cell proliferation and invasion by regulating CXCR4 expression. In conclusion, a high expression of TSTA3 exerts a proto-oncogenic effect during carcinogenesis and serves as an independent molecular marker for BC patients.
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108
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Knudsen KN, Nielsen BS, Lindebjerg J, Hansen TF, Holst R, Sørensen FB. microRNA-17 Is the Most Up-Regulated Member of the miR-17-92 Cluster during Early Colon Cancer Evolution. PLoS One 2015; 10:e0140503. [PMID: 26465597 PMCID: PMC4605595 DOI: 10.1371/journal.pone.0140503] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2015] [Accepted: 09/24/2015] [Indexed: 12/30/2022] Open
Abstract
Deregulated microRNAs play a role in the development and progression of colon cancer, but little is known about their tissue and cell distribution in the continuum of normal mucosa through the premalignant adenoma to invasive adenocarcinoma. The aim of this study was to examine the expression pattern of the miR-17-92 cluster (miR-17, miR-18, miR-19, miR-20 and miR-92) as well as miR-21, miR-31, miR-135b, and miR-145 in early clinically diagnosed colon cancer. MicroRNAs were analysed by chromogenic in situ hybridisation in the normal-adenoma-adenocarcinoma sequence of nine adenocarcinomas developed in mucosal colon polyps. Subsequently, the expression of selected microRNAs was validated in 24 mucosal colon cancer polyps. Expression of miR-17 was confined to the epithelial cells, and the expression levels increased in the transitional zone from normal to adenomatous tissue. The miR-17-92 cluster members, miR-19b, miR-20a, and miR-92a, followed the same expression pattern, but miR-17 was the most predominant. An increased expression of miR-21 was found in the tumour-associated stroma with the most dramatic increase from adenoma to adenocarcinoma, while the number of positive miR-145 fibroblast-like cells in the normal lamina propria (stroma) decreased in a stepwise manner throughout the normal-adenoma-adenocarcinoma sequence. It is concluded that the expression of miR-17, miR-21, and miR-145 changes at early stages of the normal-adenoma-adenocarcinoma sequence. Thus, these microRNAs may play a role in the development of colon cancer.
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Affiliation(s)
- Kirsten Nguyen Knudsen
- Department of Clinical Pathology, Vejle Hospital, Part of Lillebaelt Hospital, Vejle, Denmark
- Institute of Regional Health Research, University of Southern Denmark, Odense, Denmark
- * E-mail:
| | | | - Jan Lindebjerg
- Department of Clinical Pathology, Vejle Hospital, Part of Lillebaelt Hospital, Vejle, Denmark
| | | | - René Holst
- Institute of Regional Health Research, University of Southern Denmark, Odense, Denmark
| | - Flemming Brandt Sørensen
- Department of Clinical Pathology, Vejle Hospital, Part of Lillebaelt Hospital, Vejle, Denmark
- Institute of Regional Health Research, University of Southern Denmark, Odense, Denmark
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109
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Abstract
Colorectal cancer (CRC) is a leading cause of cancer deaths worldwide. One of the fundamental processes driving the initiation and progression of CRC is the accumulation of a variety of genetic and epigenetic changes in colonic epithelial cells. Over the past decade, major advances have been made in our understanding of cancer epigenetics, particularly regarding aberrant DNA methylation, microRNA (miRNA) and noncoding RNA deregulation, and alterations in histone modification states. Assessment of the colon cancer "epigenome" has revealed that virtually all CRCs have aberrantly methylated genes and altered miRNA expression. The average CRC methylome has hundreds to thousands of abnormally methylated genes and dozens of altered miRNAs. As with gene mutations in the cancer genome, a subset of these epigenetic alterations, called driver events, are presumed to have a functional role in CRC. In addition, the advances in our understanding of epigenetic alterations in CRC have led to these alterations being developed as clinical biomarkers for diagnostic, prognostic, and therapeutic applications. Progress in this field suggests that these epigenetic alterations will be commonly used in the near future to direct the prevention and treatment of CRC.
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Affiliation(s)
- Yoshinaga Okugawa
- Gastrointestinal Cancer Research Laboratory, Division of Gastroenterology, Department of Internal Medicine, Charles A. Sammons Cancer Center and Baylor Research Institute, Baylor University Medical Center, Dallas, TX, 75246-2017, USA
| | - William M. Grady
- Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA, 98109, USA,Division of Gastroenterology, University of Washington School of Medicine, Seattle, WA 98195, USA
| | - Ajay Goel
- Gastrointestinal Cancer Research Laboratory, Division of Gastroenterology, Department of Internal Medicine, Charles A. Sammons Cancer Center and Baylor Research Institute, Baylor University Medical Center, Dallas, Texas.
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110
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Lei M, Xie W, Sun E, Sun Y, Tian D, Liu C, Han R, Li N, Liu M, Han R, Liu L. microRNA-21 Regulates Cell Proliferation and Migration and Cross Talk with PTEN and p53 in Bladder Cancer. DNA Cell Biol 2015; 34:626-32. [PMID: 26230405 DOI: 10.1089/dna.2015.2868] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Affiliation(s)
- Mingde Lei
- Department of Urology, Tianjin Institute of Urology, Second Hospital of Tianjin Medical University, Tianjin, People's Republic of China
| | - Wanqin Xie
- Department of Urology, Tianjin Institute of Urology, Second Hospital of Tianjin Medical University, Tianjin, People's Republic of China
| | - Erlin Sun
- Department of Urology, Tianjin Institute of Urology, Second Hospital of Tianjin Medical University, Tianjin, People's Republic of China
| | - Yan Sun
- Department of Urology, Tianjin Institute of Urology, Second Hospital of Tianjin Medical University, Tianjin, People's Republic of China
| | - Dawei Tian
- Department of Urology, Tianjin Institute of Urology, Second Hospital of Tianjin Medical University, Tianjin, People's Republic of China
| | - Chunyu Liu
- Department of Urology, Tianjin Institute of Urology, Second Hospital of Tianjin Medical University, Tianjin, People's Republic of China
| | - Rong Han
- Department of Urology, Tianjin Institute of Urology, Second Hospital of Tianjin Medical University, Tianjin, People's Republic of China
| | - Na Li
- Department of Urology, Tianjin Institute of Urology, Second Hospital of Tianjin Medical University, Tianjin, People's Republic of China
| | - Min Liu
- Department of Urology, Tianjin Institute of Urology, Second Hospital of Tianjin Medical University, Tianjin, People's Republic of China
| | - Ruifa Han
- Department of Urology, Tianjin Institute of Urology, Second Hospital of Tianjin Medical University, Tianjin, People's Republic of China
| | - Liwei Liu
- Department of Urology, Tianjin Institute of Urology, Second Hospital of Tianjin Medical University, Tianjin, People's Republic of China
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111
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Amirkhah R, Schmitz U, Linnebacher M, Wolkenhauer O, Farazmand A. MicroRNA-mRNA interactions in colorectal cancer and their role in tumor progression. Genes Chromosomes Cancer 2015; 54:129-41. [PMID: 25620079 DOI: 10.1002/gcc.22231] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2014] [Revised: 11/12/2014] [Accepted: 11/17/2014] [Indexed: 12/13/2022] Open
Abstract
MicroRNAs (miRNA/miR) play an important role in gene regulatory networks through targeting mRNAs. They are involved in diverse biological processes such as cell proliferation, differentiation, angiogenesis, and apoptosis. Due to their pivotal effects on multiple genes and pathways, dysregulated miRNAs have been reported to be associated with different diseases, including colorectal cancer (CRC). Recent evidence indicates that aberrant miRNA expression is tightly linked with the initiation and progression of CRC. To elucidate the influence of miRNA regulation in CRC, it is critical to identify dysregulated miRNAs, their target mRNA genes and their involvement in gene regulatory and signaling networks. Various experimental and computational studies have been conducted to decipher the function of miRNAs involved in CRC. Experimental studies that are used for this purpose can be classified into two categories: direct/individual and indirect/high-throughput gene expression studies. Here we review miRNA target identification studies related to CRC with an emphasis on experimental data based on Luciferase reporter assays. Recent advances in determining the function of miRNAs and the signaling pathways they are involved in have also been summarized. The review helps bioinformaticians and biologists to find extensive information about downstream targets of dysregulated miRNAs, and their pro-/anti-CRC effects.
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Affiliation(s)
- Raheleh Amirkhah
- Department of Cell and Molecular Biology, School of Biology, College of Science, University of Tehran, Tehran, Iran
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112
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113
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Abstract
Based on own translational research of the biochemical and hormonal effects of cow's milk consumption in humans, this review presents milk as a signaling system of mammalian evolution that activates the nutrient-sensitive kinase mechanistic target of rapamycin complex 1 (mTORC1), the pivotal regulator of translation. Milk, a mammary gland-derived secretory product, is required for species-specific gene-nutrient interactions that promote appropriate growth and development of the newborn mammal. This signaling system is highly conserved and tightly controlled by the lactation genome. Milk is sufficient to activate mTORC1, the crucial regulator of protein, lipid, and nucleotide synthesis orchestrating anabolism, cell growth and proliferation. To fulfill its mTORC1-activating function, milk delivers four key metabolic messengers: (1) essential branched-chain amino acids (BCAAs); (2) glutamine; (3) palmitic acid; and (4) bioactive exosomal microRNAs, which in a synergistical fashion promote mTORC1-dependent translation. In all mammals except Neolithic humans, postnatal activation of mTORC1 by milk intake is restricted to the postnatal lactation period. It is of critical concern that persistent hyperactivation of mTORC1 is associated with aging and the development of age-related disorders such as obesity, type 2 diabetes mellitus, cancer, and neurodegenerative diseases. Persistent mTORC1 activation promotes endoplasmic reticulum (ER) stress and drives an aimless quasi-program, which promotes aging and age-related diseases.
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114
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Jafri MA, Zaidi SK, Ansari SA, Al-Qahtani MH, Shay JW. MicroRNAs as potential drug targets for therapeutic intervention in colorectal cancer. Expert Opin Ther Targets 2015; 19:1705-23. [PMID: 26189482 DOI: 10.1517/14728222.2015.1069816] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
INTRODUCTION MicroRNAs (miRNAs) are small (19 - 22 nucleotide), non-protein-coding RNA segments that function as master regulators of hundreds of genes simultaneously in both normal and malignant cells. In colorectal cancer (CRC) miRNAs are deregulated and have critical roles in initiation and progression of CRC by interacting with various oncogenes and tumor suppressor genes including APC, KRAS and p53, or by modulating downstream signal transduction pathways. Numerous promising miRNAs have emerged as potential drug targets for therapeutic intervention and possible candidates for replacement therapy in CRC. AREAS COVERED In this review the authors summarize the available information on miRNAs and their role in CRC. The authors point out specific miRNAs as potential drug targets and those having a significant role in gene activation and gene silencing during the process of CRC development, to highlight their importance as possible therapeutic candidates for the treatment of CRC. EXPERT OPINION Targeting miRNAs provides an emerging opportunity to develop effective miRNA-based replacement therapy or antagonists to alter expression in colon cancer patient tumors. However, the biggest challenge is to overcome obstacles associated with pharmacokinetics, delivery and toxicity in order to translate the potential of miRNAs into efficacious anticancer drugs.
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Affiliation(s)
- Mohammad Alam Jafri
- a 1 King Abdulaziz University, Center of Excellence in Genomic Medicine Research , Jeddah, Saudi Arabia
| | - Syed Kashif Zaidi
- a 1 King Abdulaziz University, Center of Excellence in Genomic Medicine Research , Jeddah, Saudi Arabia
| | - Shakeel Ahmed Ansari
- a 1 King Abdulaziz University, Center of Excellence in Genomic Medicine Research , Jeddah, Saudi Arabia
| | | | - Jerry W Shay
- a 1 King Abdulaziz University, Center of Excellence in Genomic Medicine Research , Jeddah, Saudi Arabia.,b 2 UT Southwestern Medical Center, Department of Cell Biology , Dallas, TX, USA +1 214 648 4201 ; +1 214 648 5814 ;
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115
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Yu P, Wu D, You Y, Sun J, Lu L, Tan J, Bie P. miR-208-3p promotes hepatocellular carcinoma cell proliferation and invasion through regulating ARID2 expression. Exp Cell Res 2015; 336:232-41. [PMID: 26169693 PMCID: PMC7094640 DOI: 10.1016/j.yexcr.2015.07.008] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2015] [Revised: 07/08/2015] [Accepted: 07/09/2015] [Indexed: 02/07/2023]
Abstract
MicroRNAs (miRNAs) are small non-coding RNAs that negatively regulate gene expression at post-transcriptional level. miRNA dysregulation plays a causal role in cancer progression. In this study, miR-208-3p was highly expressed and directly repressed ARID2 expression. As a result, ARID2 expression in hepatocellular carcinoma (HCC) was decreased. In vitro, miR-208-3p down-regulation and ARID2 over-expression elicited similar inhibitory effects on HCC cell proliferation and invasion. In vivo test results revealed that miR-208-3p down-regulation inhibited HCC tumorigenesis in Hep3B cells. Moreover, ARID2 was possibly a downstream element of transforming growth factor beta1 (TGFβ1)/miR-208-3p/ARID2 regulatory pathway. These findings suggested that miR-208-3p up-regulation is associated with HCC cell progression and may provide a new target for liver cancer treatment. miR-208-3p was highly expressed and directly repressed the expression of ARID2 in HCC. miR-208-3p contributed to HCC cell progression both in vitro and in vivo. Over-expression of ARID2 inhibited the HCC cell proliferation and invasion. Restoration of ARID2 partly reversed the the effect of miR-208-3p down-regulation on HCC cells. Newly regulatory pathway: miR-208-3p mediated the repression of ARID2 by TGFβ1 in HCC cells.
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Affiliation(s)
- Peng Yu
- Department of Hepatobiliary Surgery, Southwest Hospital, Third Military Medical University, Chongqing, People's Republic of China
| | - Dingguo Wu
- Department of Hepatobiliary Surgery, Southwest Hospital, Third Military Medical University, Chongqing, People's Republic of China
| | - Yu You
- Department of Hepatobiliary Surgery, Southwest Hospital, Third Military Medical University, Chongqing, People's Republic of China
| | - Jing Sun
- Department of Hepatobiliary Surgery, Southwest Hospital, Third Military Medical University, Chongqing, People's Republic of China
| | - Lele Lu
- Department of Hepatobiliary Surgery, Southwest Hospital, Third Military Medical University, Chongqing, People's Republic of China
| | - Jiaxing Tan
- Department of Hepatobiliary Surgery, Southwest Hospital, Third Military Medical University, Chongqing, People's Republic of China
| | - Ping Bie
- Department of Hepatobiliary Surgery, Southwest Hospital, Third Military Medical University, Chongqing, People's Republic of China.
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116
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Melnik BC. MiR-21: an environmental driver of malignant melanoma? J Transl Med 2015; 13:202. [PMID: 26116372 PMCID: PMC4482047 DOI: 10.1186/s12967-015-0570-5] [Citation(s) in RCA: 94] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2015] [Accepted: 06/10/2015] [Indexed: 01/04/2023] Open
Abstract
Since the mid-1950’s, melanoma incidence has been rising steadily in industrialized Caucasian populations, thereby pointing to the pivotal involvement of environmental factors in melanomagenesis. Recent evidence underlines the crucial role of microRNA (miR) signaling in cancer initiation and progression. Increased miR-21 expression has been observed during the transition from a benign melanocytic lesion to malignant melanoma, exhibiting highest expression of miR-21. Notably, common BRAF and NRAS mutations in cutaneous melanoma are associated with increased miR-21 expression. MiR-21 is an oncomiR that affects critical target genes of malignant melanoma, resulting in sustained proliferation (PTEN, PI3K, Sprouty, PDCD4, FOXO1, TIPE2, p53, cyclin D1), evasion from apoptosis (FOXO1, FBXO11, APAF1, TIMP3, TIPE2), genetic instability (MSH2, FBXO11, hTERT), increased oxidative stress (FOXO1), angiogenesis (PTEN, HIF1α, TIMP3), invasion and metastasis (APAF1, PTEN, PDCD4, TIMP3). The purpose of this review is to provide translational evidence for major environmental and individual factors that increase the risk of melanoma, such as UV irradiation, chemical noxes, air pollution, smoking, chronic inflammation, Western nutrition, obesity, sedentary lifestyle and higher age, which are associated with increased miR-21 signaling. Exosomal miR-21 induced by extrinsic and intrinsic stimuli may be superimposed on mutation-induced miR-21 pathways of melanoma cells. Thus, oncogenic miR-21 signaling may be the converging point of intrinsic and extrinsic stimuli driving melanomagenesis. Future strategies of melanoma treatment and prevention should thus aim at reducing the burden of miR-21 signal transduction.
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Affiliation(s)
- Bodo C Melnik
- Department of Dermatology, Environmental Medicine and Health Theory, University of Osnabrück, Sedanstrasse 115, 49090, Osnabrück, Germany.
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117
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Xu F, Xu L, Wang M, An G, Feng G. The accuracy of circulating microRNA-21 in the diagnosis of colorectal cancer: a systematic review and meta-analysis. Colorectal Dis 2015; 17:O100-7. [PMID: 25683351 DOI: 10.1111/codi.12917] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Accepted: 12/22/2014] [Indexed: 02/06/2023]
Abstract
AIM The accuracy and clinical value of circulating microRNA-21 (miR-21) were assessed as a novel diagnostic biomarker of colorectal cancer (CRC). METHOD Medline/PubMed, EMBASE, the Cochrane Library databases and grey literature (Google scholar; British Library) were searched up to 29 September 2014 for eligible studies of the association between blood-based miR-21 and a diagnosis of CRC. Quality Assessment of Diagnostic Accuracy Studies (QUADAS) was employed to assess the quality of the included studies by two investigators. Stata12.0 and Meta-DiSc1.4 software were applied to test the heterogeneity using Cochran's Q test and I(2) statistics and to perform the meta-analysis. RESULTS Seven studies with 676 CRC patients and 417 controls were included in the meta-analysis. All were of high quality (QUADAS scores 12 or 13). For miR-21, the pooled sensitivity, specificity, positive likelihood ratio, negative likelihood ratio and diagnostic odds ratio to predict CRC were 75% [95% confidence interval (CI) 63-83%], 84% (95% CI 79-87%), 4.61 (95% CI 3.38-6.29), 0.30 (95% CI 0.20-0.46) and 16.89 (95% CI 7.56-37.73) after using a random-effects model analysis. The area under the summary receiver operating characteristic curve was 0.86 (95% CI 0.83-0.89). CONCLUSION The results suggest that circulating miR-21 is a biomarker with moderate sensitivity and specificity for CRC.
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Affiliation(s)
- F Xu
- Department of General Surgery, Beijing Chao-Yang Hospital, Capital Medical University, Beijing, China
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118
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Xu J, Zhang W, Lv Q, Zhu D. Overexpression of miR-21 promotes the proliferation and migration of cervical cancer cells via the inhibition of PTEN. Oncol Rep 2015; 33:3108-16. [PMID: 25963606 DOI: 10.3892/or.2015.3931] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2015] [Accepted: 03/04/2015] [Indexed: 11/06/2022] Open
Abstract
The oncogenic miR-21 has been widely recognized to promote the development and progression of various types of malignant tumors, but not cervical cancers. The aim of this study was to examine the expression of miR-21 and PTEN in cervical cancer specimens using quantitative PCR. The miR-21 level was then manipulated in the cervical cancer lines and the regulation of miR-21 on the proliferation, migration and invasion of cervical cancer cells was determined. Additionally, we determined the role of PTEN in the miR-21-regulated proliferation, migration and invasion of cervical cancer cells. miR-21 was upregulated in the cervical cancer specimens, negatively correlating with the PTEN mRNA level. Transfection of the miR-21 mimics was markedly promoted, whereas the miR-21 inhibitor suppressed the proliferation, migration and invasion of cervical cancer cells, with a significant inhibition of PTEN expression. In addition, the overexpression of PTEN markedly inhibited the proliferation and migration of the cervical cancer cells. The present study showed the upregulation of miR-21 in invasive cervical cancers, and confirmed the promotion of miR-21 with regard to the proliferation, migration and invasion in cervical cancer cells via inhibiting the PTEN expression. To the best of our knowledge, this is the first study to confirm that the miR-21/PTEN pathway promotes cervical cancer.
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Affiliation(s)
- Jingjie Xu
- The First Department of Gynaecology, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China
| | - Wei Zhang
- The First Department of Gynaecology, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China
| | - Qiongying Lv
- The First Department of Gynaecology, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China
| | - Dingjun Zhu
- The First Department of Gynaecology, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China
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Omrane I, Benammar-Elgaaied A. The immune microenvironment of the colorectal tumor: Involvement of immunity genes and microRNAs belonging to the TH17 pathway. Biochim Biophys Acta Rev Cancer 2015; 1856:28-38. [PMID: 25911397 DOI: 10.1016/j.bbcan.2015.04.001] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2015] [Revised: 03/16/2015] [Accepted: 04/14/2015] [Indexed: 12/17/2022]
Abstract
Colorectal cancer is a complex and multifactorial disease. Various factors such as genetic, immunological, epigenetic and environmental constitute minor risk factors with their additive effects contributing to the advent of colorectal cancer. In order to evaluate the role of innate and adaptive immunity in the susceptibility, the presentation and the development of colorectal cancer, we considered an immunogenetic approach on polymorphisms in the TLR4 gene and NOD2/CARD15 gene (receptors of innate immunity) as well as in cytokine genes of the TH17 pathway IL17A, IL17F and cytokine receptor IL23R. Then, we evaluated the expression of microRNAs regulated by TLR4 and NOD2/CARD15 or targeting TLR4, IL17 and proinflammatory cytokines (IL-6, TNF) induced by IL17. Through a case-control study, we showed that the polymorphism of IL17A is associated with its susceptibility to colorectal cancer. Considering the tumor location, we found that the mutated alleles of IL17A, IL17F and IL23R are rather associated with colon cancer and not with rectum cancer. This result confirms that the colon and rectum are two different physiological entities. This study shows that TLR4, IL17A/F and IL23R polymorphisms are involved in the presentation of the disease with regard to tumor architecture, histology, and differentiation, advanced stage of the disease and lymph node and metastasis. Overall, these polymorphisms are associated with a poor prognosis of the disease. Furthermore, in order to evaluate the involvement of epigenetic mechanisms in the occurrence of colorectal cancer, we aimed at analyzing the tumor compared to a normal adjacent tissue and the expression of miRNAs (miR21, miR146a, miR135a, miR147b and miR155) that regulate immunity genes especially the cytokines of the TH17 pathway. This research has shown that microRNAs 21, 135a and 146a are associated with colorectal cancer. Indeed, these three miRs are overexpressed in cancer tissue compared to healthy tissue. These results clearly confirm the involvement of epigenetics in colorectal cancer. In other words, this study reveals the importance of immunity and specifically the TH17 pathway in the development and presentation of colorectal cancer. These results suggest that TLR4, IL17A, IL17F and IL23R polymorphisms as well as the expression of microRNAs that regulate inflammation and the TH17 pathway are associated with the evolution and progression of the colorectal tumor that could be considered as biomarkers in colorectal cancer.
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Affiliation(s)
- Inés Omrane
- Laboratoire de Génétique Immunologie et Pathologie Humaine, Faculté des Sciences de Tunis, Université de Tunis EL MANAR, Tunisia.
| | - Amel Benammar-Elgaaied
- Laboratoire de Génétique Immunologie et Pathologie Humaine, Faculté des Sciences de Tunis, Université de Tunis EL MANAR, Tunisia
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120
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Toste PA, Li L, Kadera BE, Nguyen AH, Tran LM, Wu N, Madnick DL, Patel SG, Dawson DW, Donahue TR. p85α is a microRNA target and affects chemosensitivity in pancreatic cancer. J Surg Res 2015; 196:285-293. [PMID: 25846727 DOI: 10.1016/j.jss.2015.02.071] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2015] [Revised: 02/16/2015] [Accepted: 02/27/2015] [Indexed: 01/06/2023]
Abstract
BACKGROUND We previously identified a correlation between increased expression of the phosphoinositide 3-kinase (PI3K) regulatory subunit p85α and improved survival in human pancreatic ductal adenocarcinoma (PDAC). The purpose of this study was to investigate the impact of changes in p85α expression on response to chemotherapy and the regulation of p85α by microRNA-21 (miR-21). MATERIALS AND METHODS PDAC tumor cells overexpressing p85α were generated by viral transduction, and the effect of p85α overexpression on sensitivity to gemcitabine was tested by MTT assay. Primary human PDAC tumors were stained for p85α and miR-21 via immunohistochemistry and in situ hybridization, respectively. Additionally, PDAC cells were treated with miR-21 mimic, and changes in p85α and phospho-AKT were assessed by Western blot. Finally, a luciferase reporter assay system was used to test direct regulation of p85α by miR-21. RESULTS Higher p85α expression resulted in increased sensitivity to gemcitabine (P < 0.01), which correlated with decreased PI3K-AKT activation. Human tumors demonstrated an inverse correlation between miR-21 and p85α expression levels (r = -0.353, P < 0.001). In vitro, overexpression of miR-21 resulted in decreased levels of p85α and increased phosphorylation of AKT. Luciferase reporter assays confirmed the direct regulation of p85α by miR-21 (P < 0.01). CONCLUSIONS Our results demonstrate that p85α expression is a determinant of chemosensitivity in PDAC. Additionally, we provide novel evidence that miR-21 can influence PI3K-AKT signaling via its direct regulation of p85α. These data provide insight into potential mechanisms for the known relationship between increased p85α expression and improved survival in PDAC.
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Affiliation(s)
- Paul A Toste
- Department of Surgery, Division of General Surgery, David Geffen School of Medicine at University of California Los Angeles (UCLA), Los Angeles, CA, USA
| | - Luyi Li
- Department of Surgery, Division of General Surgery, David Geffen School of Medicine at University of California Los Angeles (UCLA), Los Angeles, CA, USA
| | - Brian E Kadera
- Department of Surgery, Division of General Surgery, David Geffen School of Medicine at University of California Los Angeles (UCLA), Los Angeles, CA, USA
| | - Andrew H Nguyen
- Department of Surgery, Division of General Surgery, David Geffen School of Medicine at University of California Los Angeles (UCLA), Los Angeles, CA, USA
| | - Linh M Tran
- Department of Molecular and Medical Pharmacology, David Geffen School of Medicine at University of California Los Angeles (UCLA), Los Angeles, CA, USA
| | - Nanping Wu
- Department of Surgery, Division of General Surgery, David Geffen School of Medicine at University of California Los Angeles (UCLA), Los Angeles, CA, USA
| | - David L Madnick
- Department of Surgery, Division of General Surgery, David Geffen School of Medicine at University of California Los Angeles (UCLA), Los Angeles, CA, USA
| | - Sanjeet G Patel
- Department of Surgery, Division of General Surgery, David Geffen School of Medicine at University of California Los Angeles (UCLA), Los Angeles, CA, USA
| | - David W Dawson
- Department of Pathology and Laboratory Medicine, David Geffen School of Medicine at University of California Los Angeles (UCLA), Los Angeles, CA, USA.,Jonsson Comprehensive Cancer Center, David Geffen School of Medicine at University of California Los Angeles (UCLA), Los Angeles, CA, USA
| | - Timothy R Donahue
- Department of Surgery, Division of General Surgery, David Geffen School of Medicine at University of California Los Angeles (UCLA), Los Angeles, CA, USA.,Department of Molecular and Medical Pharmacology, David Geffen School of Medicine at University of California Los Angeles (UCLA), Los Angeles, CA, USA.,Jonsson Comprehensive Cancer Center, David Geffen School of Medicine at University of California Los Angeles (UCLA), Los Angeles, CA, USA
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121
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Abstract
The tumour microenvironment, long considered as determining cancer development, still offers research fields to define hallmarks of cancer. An early key-step, the “angiogenic switch”, allows tumour growth. Pathologic angiogenesis is a cancer hallmark as it features results of tumour-specific properties that can be summarised as a response to hypoxia. The hypoxic state occurs when the tumour mass reaches a volume sufficient not to permit oxygen diffusion inside the tumour centre. Thus tumour cells turn on adaptation mechanisms to the low pO2 level, inducing biochemical responses in terms of cytokines/chemokines/receptors and consequently recruitment of specific cell types, as well as cell-selection inside the tumour. Moreover, these changes are orchestrated by the microRNA balance strongly reflecting the hypoxic milieu and mediating the cross-talk between endothelial and tumour cells. MicroRNAs control of the endothelial precursor-vascular settings shapes the niche for selection of cancer stem cells.
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122
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Kang WK, Lee JK, Oh ST, Lee SH, Jung CK. Stromal expression of miR-21 in T3-4a colorectal cancer is an independent predictor of early tumor relapse. BMC Gastroenterol 2015; 15:2. [PMID: 25609245 PMCID: PMC4308857 DOI: 10.1186/s12876-015-0227-0] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/10/2014] [Accepted: 01/05/2015] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND MicroRNA-21 (miR-21) is an oncogenic microRNA that regulates the expression of multiple cancer-related target genes. miR-21 has been associated with progression of some types of cancer. Metastasis-associated protein1 expression and loss of E-cadherin expression are correlated with cancer progression and metastasis in many cancer types. In advanced colorectal cancer, the clinical significance of miR-21 expression remains unclear. We aimed to investigate the impact of miR-21 expression in advanced colorectal cancer and its correlation with target proteins associated with colorectal cancer progression. METHODS From 2004 to 2007, 277 consecutive patients with T3-4a colorectal cancer treated with R0 surgical resection were included. Patients with neoadjuvant therapy and distant metastasis at presentation were excluded. The expression of miR-21 was investigated by in situ hybridization. Immunohistochemistry was used to detect E-cadherin and metastasis-associated protein1 expression. RESULTS High stromal expression of miR-21 was found in 76 of 277 (27.4%) colorectal cancer samples and was correlated with low E-cadherin expression (P = 0.019) and high metastasis-associated protein1 expression (P = 0.004). T3-4a colorectal cancer patients with high miR-21 expression had significantly shorter recurrence-free survival than those with low miR-21 expression. When analyzing colon and rectal cancer separately, high expression of miR-21 was an independent prognostic factor of unfavorable recurrence-free survival in T3-4a colon cancer patients (P = 0.038, HR = 2.45; 95% CI = 1.05-5.72) but not in T3-4a rectal cancer patients. In a sub-classification analysis, high miR-21 expression was associated with shorter recurrence-free survival in the stage II cancer (P = 0.001) but not in the stage III subgroup (P = 0.267). CONCLUSIONS Stromal miR-21 expression is related to the expression of E-cadherin and metastasis-associated protein1 in colorectal cancer. Stage II colorectal cancer patients with high levels of miR-21 are at higher risk for tumor recurrence and should be considered for more intensive treatment.
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Affiliation(s)
- Won Kyung Kang
- Department of Surgery, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.
| | - Jin Kwon Lee
- Department of Surgery, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.
| | - Seong Taek Oh
- Department of Surgery, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.
| | - Sung Hak Lee
- Department of Hospital Pathology, College of Medicine, The Catholic University of Korea, 222 Banpodaero, Seocho-gu, Seoul, 137-701, Republic of Korea.
| | - Chan Kwon Jung
- Department of Hospital Pathology, College of Medicine, The Catholic University of Korea, 222 Banpodaero, Seocho-gu, Seoul, 137-701, Republic of Korea.
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123
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Relationship between expression of onco-related miRNAs and the endoscopic appearance of colorectal tumors. Int J Mol Sci 2015; 16:1526-43. [PMID: 25584614 PMCID: PMC4307318 DOI: 10.3390/ijms16011526] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2014] [Accepted: 12/25/2014] [Indexed: 01/08/2023] Open
Abstract
Accumulating data indicates that certain microRNAs (miRNAs or miRs) are differently expressed in samples of tumors and paired non-tumorous samples taken from the same patients with colorectal tumors. We examined the expression of onco-related miRNAs in 131 sporadic exophytic adenomas or early cancers and in 52 sporadic flat elevated adenomas or early cancers to clarify the relationship between the expression of the miRNAs and the endoscopic morphological appearance of the colorectal tumors. The expression levels of miR-143, -145, and -34a were significantly reduced in most of the exophytic tumors compared with those in the flat elevated ones. In type 2 cancers, the miRNA expression profile was very similar to that of the exophytic tumors. The expression levels of miR-7 and -21 were significantly up-regulated in some flat elevated adenomas compared with those in exophytic adenomas. In contrast, in most of the miR-143 and -145 down-regulated cases of the adenoma-carcinoma sequence and in some of the de novo types of carcinoma, the up-regulation of oncogenic miR-7 and/or -21 contributed to the triggering mechanism leading to the carcinogenetic process. These findings indicated that the expression of onco-related miRNA was associated with the morphological appearance of colorectal tumors.
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Danielsen SA, Eide PW, Nesbakken A, Guren T, Leithe E, Lothe RA. Portrait of the PI3K/AKT pathway in colorectal cancer. Biochim Biophys Acta Rev Cancer 2014; 1855:104-21. [PMID: 25450577 DOI: 10.1016/j.bbcan.2014.09.008] [Citation(s) in RCA: 173] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2014] [Accepted: 09/07/2014] [Indexed: 12/16/2022]
Abstract
PI3K/AKT signaling leads to reduced apoptosis, stimulates cell growth and increases proliferation. Under normal conditions, PI3K/AKT activation is tightly controlled and dependent on both extracellular growth signals and the availability of amino acids and glucose. Genetic aberrations leading to PI3K/AKT hyper-activation are observed at considerable frequency in all major nodes in most tumors. In colorectal cancer the most commonly observed pathway changes are IGF2 overexpression, PIK3CA mutations and PTEN mutations and deletions. Combined, these alterations are found in about 40% of large bowel tumors. In addition, but not mutually exclusive to these, KRAS mutations are observed at a similar frequency. There are however additional, less frequent and more poorly understood events that may also push the PI3K/AKT pathway into overdrive and thus promote malignant growth. Here we discuss aberrations of components at the genetic, epigenetic, transcriptional, post-transcriptional, translational and post-translational level where perturbations may drive excessive PI3K/AKT signaling. Integrating multiple molecular levels will advance our understanding of this cancer critical circuit and more importantly, improve our ability to pharmacologically target the pathway in view of clonal development, tumor heterogeneity and drug resistance mechanisms. In this review, we revisit the PI3K/AKT pathway cancer susceptibility syndromes, summarize the known aberrations at the different regulatory levels and the prognostic and predictive values of these alterations in colorectal cancer.
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Affiliation(s)
- Stine Aske Danielsen
- Department of Cancer Prevention, Institute for Cancer Research, Oslo University Hospital, Oslo, Norway; K.G. Jebsen Colorectal Cancer Research Centre, Oslo University Hospital, Oslo, Norway
| | - Peter Wold Eide
- Department of Cancer Prevention, Institute for Cancer Research, Oslo University Hospital, Oslo, Norway; K.G. Jebsen Colorectal Cancer Research Centre, Oslo University Hospital, Oslo, Norway
| | - Arild Nesbakken
- K.G. Jebsen Colorectal Cancer Research Centre, Oslo University Hospital, Oslo, Norway; Department of Gastrointestinal Surgery, Oslo University Hospital, Oslo, Norway
| | - Tormod Guren
- K.G. Jebsen Colorectal Cancer Research Centre, Oslo University Hospital, Oslo, Norway; Department of Oncology, Oslo University Hospital, Oslo, Norway
| | - Edward Leithe
- Department of Cancer Prevention, Institute for Cancer Research, Oslo University Hospital, Oslo, Norway; K.G. Jebsen Colorectal Cancer Research Centre, Oslo University Hospital, Oslo, Norway
| | - Ragnhild A Lothe
- Department of Cancer Prevention, Institute for Cancer Research, Oslo University Hospital, Oslo, Norway; K.G. Jebsen Colorectal Cancer Research Centre, Oslo University Hospital, Oslo, Norway.
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125
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Shang C, Guo Y, Hong Y, Liu YH, Xue YX. MiR-21 up-regulation mediates glioblastoma cancer stem cells apoptosis and proliferation by targeting FASLG. Mol Biol Rep 2014; 42:721-7. [PMID: 25394756 DOI: 10.1007/s11033-014-3820-3] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2014] [Accepted: 11/08/2014] [Indexed: 11/30/2022]
Abstract
To investigate whether miR-21 can affect the apoptosis and proliferation of glioblastoma cancer stem cells (GSCs) from down-regulating FASLG. The expression of miRNA-21 was detected by quantitative real-time PCR in normal brain tissue and glioblastoma samples, and the changes of miRNA-21 expression between GSCs and non-GSCs were also detected. The apoptosis and proliferation ability of miR-21 in GSCs were analyzed by MTT and flow cytometry assay after anti-miR-21 transfection. For the regulation mechanism analysis of miR-21, TargetScan, PicTar and microRNA were selected to predict some potential target genes of miR-21. The predicted gene was identified to be the direct and specific target gene of miR-21 by luciferase activities assay and western blot. RNA interference technology was used to confirm the apoptosis and proliferation effects of miR-21 were directly induced by FASLG. The expression of miR-21 increased significantly in glioblastoma contrast to normal brain tissue, and miR-21 up-regulated in GSCs remarkably. The proliferation of GSCs cell could be inhibited with high-expression of miR-21 and this effect could be restored by miR-21 knocked down. Mechanism analysis revealed that FASLG was a specific and direct target gene of miR-21. The advanced effects of anti-miR-21 on GSCs apoptosis and proliferation were mediated by expression of silenced FASLG. In summary, aberrantly expressed miR-21 regulates GSCs apoptosis and proliferation partly through directly down-regulating FASLG protein expression in GSCs and this might offer a new potential therapeutic stratagem for glioblastoma.
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Affiliation(s)
- Chao Shang
- Department of Neurobiology, China Medical University, No. 92 Beier Road, Heping District, Shenyang, 110001, People's Republic of China
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Ge XT, Lei P, Wang HC, Zhang AL, Han ZL, Chen X, Li SH, Jiang RC, Kang CS, Zhang JN. miR-21 improves the neurological outcome after traumatic brain injury in rats. Sci Rep 2014; 4:6718. [PMID: 25342226 PMCID: PMC4208064 DOI: 10.1038/srep06718] [Citation(s) in RCA: 114] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2014] [Accepted: 10/03/2014] [Indexed: 01/20/2023] Open
Abstract
The expression levels of microRNAs (miRNAs) including miR-21, have been reported to change in response to traumatic brain injury (TBI), suggesting that they may influence the pathophysiological process in brain injury. To analyze the potential effect of miR-21 on neurological function after TBI, we employed the fluid percussion injury rat model and manipulated the expression level of miR-21 in brain using intracerebroventricular infusion of miR-21 agomir or antagomir. We found that upregulation of miR-21 level in brain conferred a better neurological outcome after TBI by improving long-term neurological function, alleviating brain edema and decreasing lesion volume. To further investigate the mechanism underlying this protective effect, we evaluated the impact of miR-21 on apoptosis and angiogenesis in brain after TBI. We found that miR-21 inhibited apoptosis and promoted angiogenesis through regulating the expression of apoptosis- and angiogenesis-related molecules. In addition, the expression of PTEN, a miR-21 target gene, was inhibited and Akt signaling was activated in the procedure. Taken together, these data indicate that miR-21 could be a potential therapeutic target for interventions after TBI.
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Affiliation(s)
- Xin-Tong Ge
- 1] Laboratory of Neuro-Trauma, Tianjin Neurological Institute, Tianjin, China [2] Key Laboratory of Post-trauma Neuro-repair and Regeneration in Central Nervous System, Ministry of Education, Tianjin, China; Tianjin Key Laboratory of Injuries, Variations and Regeneration of Nervous System, Tianjin, Tianjin, China [3] Department of Neurosurgery, Tianjin Medical University General Hospital, Tianjin, China
| | - Ping Lei
- 1] Key Laboratory of Post-trauma Neuro-repair and Regeneration in Central Nervous System, Ministry of Education, Tianjin, China; Tianjin Key Laboratory of Injuries, Variations and Regeneration of Nervous System, Tianjin, Tianjin, China [2] Department of Neurosurgery, Tianjin Medical University General Hospital, Tianjin, China [3] Department of Geriatrics, Tianjin Medical University General Hospital, Tianjin, China; Laboratory of Neuro-Trauma and Neurodegenerative Disorders, Tianjin Geriatrics Institute, Tianjin, China
| | - Hai-Chen Wang
- Department of Neurology, Duke University School of Medicine, Durham, North Carolina, U.S.A
| | - An-Ling Zhang
- 1] Key Laboratory of Post-trauma Neuro-repair and Regeneration in Central Nervous System, Ministry of Education, Tianjin, China; Tianjin Key Laboratory of Injuries, Variations and Regeneration of Nervous System, Tianjin, Tianjin, China [2] Department of Neurosurgery, Tianjin Medical University General Hospital, Tianjin, China [3] Laboratory of Neuro-Oncology, Tianjin Neurological Institute, Tianjin, China
| | - Zhao-Li Han
- 1] Laboratory of Neuro-Trauma, Tianjin Neurological Institute, Tianjin, China [2] Key Laboratory of Post-trauma Neuro-repair and Regeneration in Central Nervous System, Ministry of Education, Tianjin, China; Tianjin Key Laboratory of Injuries, Variations and Regeneration of Nervous System, Tianjin, Tianjin, China [3] Department of Geriatrics, Tianjin Medical University General Hospital, Tianjin, China; Laboratory of Neuro-Trauma and Neurodegenerative Disorders, Tianjin Geriatrics Institute, Tianjin, China
| | - Xin Chen
- 1] Laboratory of Neuro-Trauma, Tianjin Neurological Institute, Tianjin, China [2] Key Laboratory of Post-trauma Neuro-repair and Regeneration in Central Nervous System, Ministry of Education, Tianjin, China; Tianjin Key Laboratory of Injuries, Variations and Regeneration of Nervous System, Tianjin, Tianjin, China [3] Department of Neurosurgery, Tianjin Medical University General Hospital, Tianjin, China
| | - Sheng-Hui Li
- 1] Laboratory of Neuro-Trauma, Tianjin Neurological Institute, Tianjin, China [2] Key Laboratory of Post-trauma Neuro-repair and Regeneration in Central Nervous System, Ministry of Education, Tianjin, China; Tianjin Key Laboratory of Injuries, Variations and Regeneration of Nervous System, Tianjin, Tianjin, China [3] Department of Neurosurgery, Tianjin Medical University General Hospital, Tianjin, China
| | - Rong-Cai Jiang
- 1] Laboratory of Neuro-Trauma, Tianjin Neurological Institute, Tianjin, China [2] Key Laboratory of Post-trauma Neuro-repair and Regeneration in Central Nervous System, Ministry of Education, Tianjin, China; Tianjin Key Laboratory of Injuries, Variations and Regeneration of Nervous System, Tianjin, Tianjin, China [3] Department of Neurosurgery, Tianjin Medical University General Hospital, Tianjin, China
| | - Chun-Sheng Kang
- 1] Key Laboratory of Post-trauma Neuro-repair and Regeneration in Central Nervous System, Ministry of Education, Tianjin, China; Tianjin Key Laboratory of Injuries, Variations and Regeneration of Nervous System, Tianjin, Tianjin, China [2] Department of Neurosurgery, Tianjin Medical University General Hospital, Tianjin, China [3] Laboratory of Neuro-Oncology, Tianjin Neurological Institute, Tianjin, China
| | - Jian-Ning Zhang
- 1] Laboratory of Neuro-Trauma, Tianjin Neurological Institute, Tianjin, China [2] Key Laboratory of Post-trauma Neuro-repair and Regeneration in Central Nervous System, Ministry of Education, Tianjin, China; Tianjin Key Laboratory of Injuries, Variations and Regeneration of Nervous System, Tianjin, Tianjin, China [3] Department of Neurosurgery, Tianjin Medical University General Hospital, Tianjin, China
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Wang T, Gu J, Li Y. Inferring the perturbed microRNA regulatory networks from gene expression data using a network propagation based method. BMC Bioinformatics 2014; 15:255. [PMID: 25069957 PMCID: PMC4124158 DOI: 10.1186/1471-2105-15-255] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Accepted: 07/21/2014] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND MicroRNAs (miRNAs) are a class of endogenous small regulatory RNAs. Identifications of the dys-regulated or perturbed miRNAs and their key target genes are important for understanding the regulatory networks associated with the studied cellular processes. Several computational methods have been developed to infer the perturbed miRNA regulatory networks by integrating genome-wide gene expression data and sequence-based miRNA-target predictions. However, most of them only use the expression information of the miRNA direct targets, rarely considering the secondary effects of miRNA perturbation on the global gene regulatory networks. RESULTS We proposed a network propagation based method to infer the perturbed miRNAs and their key target genes by integrating gene expressions and global gene regulatory network information. The method used random walk with restart in gene regulatory networks to model the network effects of the miRNA perturbation. Then, it evaluated the significance of the correlation between the network effects of the miRNA perturbation and the gene differential expression levels with a forward searching strategy. Results show that our method outperformed several compared methods in rediscovering the experimentally perturbed miRNAs in cancer cell lines. Then, we applied it on a gene expression dataset of colorectal cancer clinical patient samples and inferred the perturbed miRNA regulatory networks of colorectal cancer, including several known oncogenic or tumor-suppressive miRNAs, such as miR-17, miR-26 and miR-145. CONCLUSIONS Our network propagation based method takes advantage of the network effect of the miRNA perturbation on its target genes. It is a useful approach to infer the perturbed miRNAs and their key target genes associated with the studied biological processes using gene expression data.
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Affiliation(s)
| | - Jin Gu
- MOE Key Laboratory of Bioinformatics, TNLIST Bioinformatics Division & Center for Synthetic and Systems Biology, Department of Automation, Tsinghua University, Beijing 100084, China.
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Abstract
microRNAs (miRNAs) are a subtype of short, endogenous, and non-coding RNAs, which post-transcriptionally regulate gene expression. The miRNA-mediated gene silencing mechanism is involved in a wide spectrum of biological processes, such as cellular proliferation, differentiation, and immune responses. Picornaviridae is a large family of RNA viruses, which includes a number of causative agents of many human and animal diseases viz., poliovirus, foot-and-mouth disease virus (FMDV), and coxsackievirus B3 (CVB3). Accumulated evidences have demonstrated that replication of picornaviruses can be regulated by miRNAs and picornaviral infections can alter the expression of cellular miRNAs. Herein, we outline the intricate interactions between miRNAs and picornaviral infections.
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Affiliation(s)
- Miao Wang
- State Key Laboratory of Veterinary Etiological Biology, National Foot-and-Mouse Disease Reference Laboratory, Lanzhou Veterinary Research Institute, CAAS, Lanzhou, Gansu, China
| | - Zeqian Gao
- State Key Laboratory of Veterinary Etiological Biology, National Foot-and-Mouse Disease Reference Laboratory, Lanzhou Veterinary Research Institute, CAAS, Lanzhou, Gansu, China
| | - Li Pan
- State Key Laboratory of Veterinary Etiological Biology, National Foot-and-Mouse Disease Reference Laboratory, Lanzhou Veterinary Research Institute, CAAS, Lanzhou, Gansu, China
| | - Yongguang Zhang
- State Key Laboratory of Veterinary Etiological Biology, National Foot-and-Mouse Disease Reference Laboratory, Lanzhou Veterinary Research Institute, CAAS, Lanzhou, Gansu, China
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Lin PL, Wu DW, Huang CC, He TY, Chou MC, Sheu GT, Lee H. MicroRNA-21 promotes tumour malignancy via increased nuclear translocation of β-catenin and predicts poor outcome in APC-mutated but not in APC-wild-type colorectal cancer. Carcinogenesis 2014; 35:2175-82. [PMID: 24832083 DOI: 10.1093/carcin/bgu110] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
MiR-21 has been associated with poor prognosis in colon adenocarcinomas. However, in our preliminary data, the prognostic value of miR-21 levels was observed only in adenomatous polyposis coli (APC)-mutated tumours, not in APC-wild-type tumours. We explored whether β-catenin nuclear translocation was synergistically promoted by miR-21 in APC-mutated cells but not in APC-wild-type cells. We enrolled 165 colorectal tumour to determine APC mutation, miR-21 levels and nuclear β-catenin expression by direct sequencing, real-time PCR and immunohistochemistry. Overall survival and relapse-free survival were analysed by Kaplan-Meier and Cox regression models. The mechanistic action of β-catenin nuclear translocation modulated by miR-21 and its effect on cell invasion were evaluated in a cell model. Positive nuclear β-catenin expression was more commonly occurred in APC-mutated tumours than in APC-wild-type tumours. High miR-21 levels were relatively more common in tumours with positive nuclear β-catenin expression than in those with negative nuclear β-catenin expression. APC-mutated tumours with high miR-21 levels had shorter overall survival and relapse-free survival periods compared with others. However, the prognostic value of miR-21 levels was not observed in APC-wild-type tumours. Phosphorylation of β-catenin at Ser552 via the miR-21-mediated PTEN/AKT axis plays a critical role in β-catenin nuclear translocation in APC-mutated cells but not in APC-wild-type cells. Moreover, nuclear β-catenin expression increased by miR-21 is responsible for the capability of invasiveness. In summary, nuclear translocation of β-catenin increased by miR-21 promotes tumour malignancy and a poor outcome in APC-mutated patients but not in APC-wild-type colorectal cancer.
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Affiliation(s)
- Po-Lin Lin
- Institute of Medicine, College of Medicine, Chung Shan Medical University, Taichung 402, Taiwan
| | - De-Wei Wu
- Graduate Institute of Cancer Biology and Drug Discovery, College of Medical Science and Technology, Taipei Medical University, Taipei 115, Taiwan
| | - Chi-Chou Huang
- Department of Medicine, Chung Shan Medical University, Taichung 402, Taiwan and Department of Surgery, Chung Shan Medical University Hospital, Taichung 402, Taiwan
| | - Tsung-Ying He
- Institute of Medicine, College of Medicine, Chung Shan Medical University, Taichung 402, Taiwan
| | - Ming-Chih Chou
- Institute of Medicine, College of Medicine, Chung Shan Medical University, Taichung 402, Taiwan, Department of Medicine, Chung Shan Medical University, Taichung 402, Taiwan and Department of Surgery, Chung Shan Medical University Hospital, Taichung 402, Taiwan
| | - Gwo-Tarng Sheu
- Institute of Medicine, College of Medicine, Chung Shan Medical University, Taichung 402, Taiwan
| | - Huei Lee
- Graduate Institute of Cancer Biology and Drug Discovery, College of Medical Science and Technology, Taipei Medical University, Taipei 115, Taiwan,
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130
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Ye JJ, Cao J. MicroRNAs in colorectal cancer as markers and targets: Recent advances. World J Gastroenterol 2014; 20:4288-4299. [PMID: 24764666 PMCID: PMC3989964 DOI: 10.3748/wjg.v20.i15.4288] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/27/2013] [Revised: 01/02/2014] [Accepted: 01/20/2014] [Indexed: 02/06/2023] Open
Abstract
MicroRNAs are evolutionarily conserved small non-coding RNA molecules encoded by eukaryotic genomic DNA, and function in post-transcriptional regulation of gene expression via base-pairing with complementary sequences in target mRNAs, resulting in translational repression or degradation of target mRNAs. They represent one of the major types of epigenetic modification and play important roles in all aspects of cellular activities. Altered expression of microRNAs has been found in various human diseases including cancer. Many efforts have been made to discover the characteristic microRNA expression profiles, to understand the roles of aberrantly expressed microRNAs and underlying mechanisms in different cancers. With the application of DNA microarray, real-time quantitative polymerase chain reaction and other molecular biology techniques, increasing evidence has been accumulated which reveal that aberrant microRNAs can be detected not only intracellularly within the cancer cells, but also extracellularly in plasma of patients, postulating the potential of aberrant microRNAs as promising diagnostic/prognostic markers and attracting therapeutic targets. This review is intended to provide the most recent advances in microRNA studies in one of the most common cancers, colorectal cancer, especially the identification of those specifically altered microRNAs in colorectal cancer, validation for their relevance to clinical pathological parameters of patients, functional analyses and potential applications of these microRNAs.
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Liao WT, Ye YP, Zhang NJ, Li TT, Wang SY, Cui YM, Qi L, Wu P, Jiao HL, Xie YJ, Zhang C, Wang JX, Ding YQ. MicroRNA-30b functions as a tumour suppressor in human colorectal cancer by targeting KRAS, PIK3CD and BCL2. J Pathol 2014; 232:415-27. [PMID: 24293274 DOI: 10.1002/path.4309] [Citation(s) in RCA: 119] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2013] [Revised: 11/19/2013] [Accepted: 11/22/2013] [Indexed: 12/16/2022]
Abstract
Colorectal cancer (CRC) is the third most common cancer in the USA. MicroRNAs play important roles in the pathogenesis of CRC. In this study, we investigated the role of miR-30b in CRC and found that its expression was significantly lower in CRC tissues than that in normal tissues. We showed that a low expression level of miR-30b was closely related to poor differentiation, advanced TNM stage and poor prognosis of CRC. Further experiments showed that over-expression of miR-30b suppressed CRC cell proliferation in vitro and tumour growth in vivo. Specifically, miR-30b promoted G1 arrest and induced apoptosis. Moreover, KRAS, PIK3CD and BCL2 were identified as direct and functional targets of miR-30b. MiR-30b directly targeted the 3'-untranslated regions of their mRNAs and repressed their expression. This study revealed functional and mechanistic links between miRNA-30b and oncogene KRAS, PIK3CD and BCL2 in the pathogenesis of CRC. MiR-30b not only plays important roles in the regulation of cell proliferation and tumour growth in CRC, but is also a potential prognostic marker or therapeutic target for CRC. Restoration of miR-30b expression may represent a promising therapeutic approach for targeting malignant CRC.
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Affiliation(s)
- Wen-Ting Liao
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, People's Republic of China; Department of Pathology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, People's Republic of China
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MicroRNA roles in the NF- κB signaling pathway during viral infections. BIOMED RESEARCH INTERNATIONAL 2014; 2014:436097. [PMID: 24800225 PMCID: PMC3996895 DOI: 10.1155/2014/436097] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/31/2013] [Accepted: 03/08/2014] [Indexed: 12/21/2022]
Abstract
NF- κ B signaling network is a crucial component of innate immunity. miRNAs are a subtype of small noncoding RNAs, involved in regulation of gene expression at the posttranscriptional level. Increasing evidence has emerged that miRNAs play an important role in regulation of NF- κ B signaling pathway during viral infections. Both host and viral miRNAs are attributed to modulation of NF- κ B activity, thus affecting viral infection and clearance. Understandings of the mechanisms of these miRNAs will open a direction for development of novel antivirus drugs.
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133
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Paeonol protects rat vascular endothelial cells from ox-LDL-induced injury in vitro via downregulating microRNA-21 expression and TNF-α release. Acta Pharmacol Sin 2014; 35:483-8. [PMID: 24562307 DOI: 10.1038/aps.2013.190] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2013] [Accepted: 12/12/2013] [Indexed: 12/19/2022] Open
Abstract
AIM Paeonol (2'-hydroxy-4'-methoxyacetophenone) from Cortex moutan root is a potential therapeutic agent for atherosclerosis. This study sought to investigate the mechanisms underlying anti-inflammatory effects of paeonol in rat vascular endothelial cells (VECs) in vitro. METHODS VECs were isolated from rat thoracic aortas. The cells were pretreated with paeonol for 24 h, and then stimulated with ox-LDL for another 24 h. The expression of microRNA-21 (miR-21) and PTEN in VECs was analyzed using qRT-PCR. The expression of PTEN protein was detected by Western blotting. TNF-α release by VECs was measured by ELISA. RESULTS Ox-LDL treatment inhibited VEC growth in dose- and time-dependent manners (the value of IC50 was about 20 mg/L at 24 h). Furthermore, ox-LDL (20 mg/L) significantly increased miR-21 expression and inhibited the expression of PTEN, one of downstream target genes of miR-21 in VECs. In addition, ox-LDL (20 mg/L) significantly increased the release of TNF-α from VECs. Pretreatment with paeonol increased the survival rate of ox-LDL-treated VECs in dose- and time-dependent manners. Moreover, paeonol (120 μmol/L) prevented ox-LDL-induced increases in miR-21 expression and TNF-α release, and ox-LDL-induced inhibition in PTEN expression. A dual-luciferase reporter assay showed that miR-21 bound directly to PTEN's 3'-UTR, thus inhibiting PTEN expression. In ox-LDL treated VECs, transfection with a miR-21 mimic significantly increased miR-21 expression and inhibited PTEN expression, and attenuated the protective effects of paeonol pretreatment, whereas transfection with an miR-21 inhibitor significantly decreased miR-21 expression and increased PTEN expression, thus enhanced the protective effects of paeonol pretreatment. CONCLUSION miR-21 is an important target of paeonol for its protective effects against ox-LDL-induced VEC injury, which may play critical roles in development of atherosclerosis.
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134
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MicroRNAs 146a and 147b biomarkers for colorectal tumor's localization. BIOMED RESEARCH INTERNATIONAL 2014; 2014:584852. [PMID: 24800242 PMCID: PMC3985145 DOI: 10.1155/2014/584852] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/12/2014] [Revised: 02/11/2014] [Accepted: 02/27/2014] [Indexed: 12/18/2022]
Abstract
The recently identified class of microRNAs (miRs) provided a new insight into cancer research, since abnormalities of members of microRNAs family have been found in various types of cancer. However, the relationship between five miRNAs (miR146a, miR155, miR21, miR135a, and miR147b) and colorectal cancer remains unclear. In the present study, we examined expression of these miRNAs in 25 pair-matched colon cancer tissues and normal colon mucosa. The expression levels of miR146a, miR155, miR21, miR135a, and miR147b were quantified by real-time PCR. We found that miR21, miR146a, and miR135a were all expressed at higher levels in colon tumors. On the other hand, miR146a and miR147b expressions are significantly higher in left colon compared to right colon. These two miRs, especially miR146a, seemed to be markers for the left colon tumors. Moreover, significant proportional and inverse correlations were found between miR expressions in tumor and healthy tissue, and the correlations profiles were different depending on cancer localization. Taken together, these results lead us to suggest the presence of different mechanisms regulating miRs expression and consequently their target genes in left and right colon. So the pathway of colorectal carcinogenesis would be different according to the site of the tumor.
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136
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Liu H, Huang X, Liu X, Xiao S, Zhang Y, Xiang T, Shen X, Wang G, Sheng B. miR-21 promotes human nucleus pulposus cell proliferation through PTEN/AKT signaling. Int J Mol Sci 2014; 15:4007-18. [PMID: 24603539 PMCID: PMC3975380 DOI: 10.3390/ijms15034007] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2013] [Revised: 01/16/2014] [Accepted: 01/26/2014] [Indexed: 01/07/2023] Open
Abstract
The precise role of nucleus pulposus cell proliferation in the pathogenesis of intervertebral disc degeneration remains to be elucidated. Recent findings have revealed that microRNAs, a class of small noncoding RNAs, may regulate cell proliferation in many pathological conditions. Here, we showed that miR-21 was significantly upregulated in degenerative nucleus pulposus tissues when compared with nucleus pulposus tissues that were isolated from patients with idiopathic scoliosis and that miR-10b levels were associated with disc degeneration grade. Moreover, bioinformatics target prediction identified PTEN as a putative target of miR-21. miR-21 inhibited PTEN expression by directly targeting the 3′UTR, and this inhibition was abolished through miR-21 binding site mutations. miR-21 overexpression stimulated cell proliferation and AKT signaling pathway activation, which led to cyclin D1 translation. Additionally, the increase in proliferation and cyclin D1 expression induced by miR-21 overexpression was almost completely blocked by Ly294002, an AKT inhibitor. Taken together, aberrant miR-21 upregulation in intervertebral disc degeneration could target PTEN, which would contribute to abnormal nucleus pulposus cell proliferation through derepressing the Akt pathway. Our study also underscores the potential of miR-21 and the PTEN/Akt pathway as novel therapeutic targets in intervertebral disc degeneration.
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Affiliation(s)
- Hongzhe Liu
- Department of Orthopedic Surgery, Hunan Provincial People's Hospital, Changsha 10005, China.
| | - Xiangwang Huang
- Department of Orthopedic Surgery, Hunan Provincial People's Hospital, Changsha 10005, China.
| | - Xiangyang Liu
- Department of Orthopedic Surgery, Hunan Provincial People's Hospital, Changsha 10005, China.
| | - Sheng Xiao
- Department of Orthopedic Surgery, Hunan Provincial People's Hospital, Changsha 10005, China.
| | - Yi Zhang
- Department of Orthopedic Surgery, Hunan Provincial People's Hospital, Changsha 10005, China.
| | - Tiecheng Xiang
- Department of Orthopedic Surgery, Hunan Provincial People's Hospital, Changsha 10005, China.
| | - Xiongjie Shen
- Department of Orthopedic Surgery, Hunan Provincial People's Hospital, Changsha 10005, China.
| | - Guoping Wang
- Department of Orthopedic Surgery, Hunan Provincial People's Hospital, Changsha 10005, China.
| | - Bin Sheng
- Department of Orthopedic Surgery, Hunan Provincial People's Hospital, Changsha 10005, China.
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137
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Lee HW, Ha SY, Roh MS. Altered Expression of PTEN and Its Major Regulator MicroRNA-21 in Pulmonary Neuroendocrine Tumors. KOREAN JOURNAL OF PATHOLOGY 2014; 48:17-23. [PMID: 24627690 PMCID: PMC3950230 DOI: 10.4132/koreanjpathol.2014.48.1.17] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/24/2013] [Revised: 01/27/2014] [Accepted: 01/27/2014] [Indexed: 02/06/2023]
Abstract
Background Phosphatase and tensin homolog on chromosome ten (PTEN) is one of the most frequently inactivated tumor suppressors in various tumor types. MicroRNA-21 (miR-21) may affect tumor progression by post-transcriptional repression of expression of tumor suppressors, such as PTEN. This study was conducted to evaluate the significance of PTEN expression in pulmonary neuroendocrine (NE) tumors and to analyze the relationship between PTEN and miR-21 expressions. Methods Expressions of PTEN and miR-21 were investigated by immunohistochemistry and real time reverse transcription-polymerase chain reaction, respectively, in 75 resected pulmonary NE tumors (23 typical carcinoids [TCs], nine atypical carcinoids [ACs], 22 large cell NE carcinomas [LCNECs], and 21 small cell lung carcinomas [SCLCs]). Results Loss of PTEN expression was observed in four of 23 TCs (17.4%), four of nine ACs (44.4%), 16 of 22 LCNECs (72.7%) and nine of 21 SCLCs (42.9%) (p=.025). The expression level of miR-21 was significantly higher in high-grade NE carcinomas than in carcinoid tumors (p<.001). PTEN expression was inversely correlated with miR-21 expression (p<.001). Conclusions This study suggests that aberrant expression of PTEN in relation to miR-21 may represent an important step in the development and progression of pulmonary NE tumors.
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Affiliation(s)
- Hyoun Wook Lee
- Department of Pathology, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, Korea
| | - Seung Yeon Ha
- Department of Pathology, Gachon University Gil Medical Center, Incheon, Korea
| | - Mee Sook Roh
- Department of Pathology, Dong-A University College of Medicine, Busan, Korea
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138
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Wang HB, Jiang ZB, Li M. Research on the typical miRNA and target genes in squamous cell carcinoma and adenocarcinoma of esophagus cancer with DNA microarray. Pathol Oncol Res 2014; 20:245-52. [PMID: 24519530 DOI: 10.1007/s12253-013-9688-z] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/22/2013] [Accepted: 08/22/2013] [Indexed: 02/06/2023]
Abstract
To identify the typically expressed miRNAs in squamous cell carcinoma (SCC) and adenocarcinoma (ADC) of esophagus cancer and their target genes, and explore the related functions and pathways, providing potential biomarkers for esophageal carcinoma diagnosis and treatment. Gene expression profile GSE13937 was downloaded from Gene Expression Omnibus database which includes 152 samples, paired non-cancerous and cancerous, 44 SCC cases and 32 ADC cases; the differentially expressed miRNAs were identified with limma packages in R language after the data were normalized. Selected differentially expressed miRNAs were further analyzed using bioinformatics methods. Firstly, verified targets of miRNAs in two miRNA databases: miRecods and miRTarBase were integrated to select the targets genes of differentially expressed miRNAs. Next, String software was used to construct the target genes interaction network. Finally, function and pathway enrichment analysis of genes in the interaction network was carried out with Gestalt software. Up-regulated hsa-miR-21 and down-regulated hsa-miR-203 were identified by comparing normal and cancer tissue samples, and the targets genes regulated by these two miRNAs were most significantly related to cell cycle function and pathway, especially in the phase of G1/S. The two differentially expressed miRNA: hsa-miR-21 and hsa-miR-203 provide evidence for early diagnosis and treatment of esophageal carcinoma. The functions and pathways of target genes shows that deep understanding of cell cycle G1/S will help to illustrate the relationship between cell cycle regulation and pathogenesis of esophageal cancer.
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Affiliation(s)
- Hong Bin Wang
- Department of Cardiac-Thoracic Surgery, Sixth People's Hospital in Southern Branch, Affiliated to Shanghai Jiao Tong University, Fengxian District Central Hospital, Shanghai, 201499, China
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139
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Xue Q, Sun K, Deng HJ, Lei ST, Dong JQ, Li GX. Anti-miRNA-221 sensitizes human colorectal carcinoma cells to radiation by upregulating PTEN. World J Gastroenterol 2013; 19:9307-9317. [PMID: 24409057 PMCID: PMC3882403 DOI: 10.3748/wjg.v19.i48.9307] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/14/2013] [Revised: 09/29/2013] [Accepted: 10/14/2013] [Indexed: 02/06/2023] Open
Abstract
AIM: To investigate the regulative effect of miRNA (miR)-221 on colorectal carcinoma (CRC) cell radiosensitivity and the underlying mechanisms.
METHODS: A human CRC-derived cell line was cultured conventionally and exposed to different doses of X-rays (0, 2, 4, 6 and 8 Gy). The total RNA and protein of the cells were extracted 24 h after irradiation, and the alteration of miR-221 and phosphatase and tensin homolog deleted on chromosome 10 (PTEN) gene mRNA expression was detected by real-time reverse transcriptase polymerase chain reaction (PCR). The protein alteration of PTEN in the cells was detected by Western blotting. Caco2 cells were pretreated with or without anti-PTEN-siRNA prior to the addition of pre-miR-221 or anti-miR-221 using Lipofectamine 2000. Colony formation assay and flow cytometry analysis were used to measure the surviving cell fraction and the sensitizing enhancement ratio after irradiation. Additionally, PTEN 3′-untranslated region fragment was PCR amplified and inserted into a luciferase reporter plasmid. The luciferase reporter plasmid construct was then transfected into CRC cells together with pre-miR-221 or anti-miR-221, and the luciferase activity in the transfected cells was detected.
RESULTS: The X-ray radiation dose had a significant effect on the expression of miR-221 and PTEN protein in human Caco2 cells in a dose-dependent manner. The miR-221 expression level improved gradually with the increase in irradiation dose, while the PTEN protein expression level reduced gradually. miR-221 expression was significantly reduced in the anti-miR-221 group compared with the pre-miR-221 and negative control groups (P < 0.01). Anti-miR-221 upregulated expression of PTEN protein and enhanced the radiosensitivity of Caco2 cells (P < 0.01). Moreover, the inhibitory effect was dramatically abolished by pretreatment with anti-PTEN-siRNA, suggesting that the enhancement of radiosensitivity was indeed mediated by PTEN. A significant increase of luciferase activity was detected in CRC cells that were cotransfected with the luciferase reporter plasmid construct and anti-miR-221 (P < 0.01).
CONCLUSION: Anti-miR-221 can enhance the radiosensitivity of CRC cells by upregulating PTEN.
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140
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Li P, Mao WM, Zheng ZG, Dong ZM, Ling ZQ. Down-regulation of PTEN expression modulated by dysregulated miR-21 contributes to the progression of esophageal cancer. Dig Dis Sci 2013; 58:3483-93. [PMID: 24221338 DOI: 10.1007/s10620-013-2854-z] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/02/2013] [Accepted: 08/20/2013] [Indexed: 02/07/2023]
Abstract
BACKGROUND AND AIM miR-21, a putative tumor oncomiR, is a frequently overexpressed miRNA in a variety of tumors. Because it targets tumor-suppressor genes it has been linked to tumor progression. In this study we investigated the role of miR-21 in esophageal squamous cell carcinoma (ESCC), and its possible mechanism. METHODS Expression of miR-21 was detected by stem-loop RT-PCR in tissue from 76 invasive ESCC at stage I-IV and in their corresponding para-cancerous histological normal tissues (PCHNT). Thirty endoscopic esophageal mucosal biopsy specimens from non-tumor patients were used as controls. Expression of PTEN in 76 paired ESCC and PCHNT was investigated by real-time RT-PCR and an immunohistochemical method, respectively. Paired tumor and PCHNT specimens of 20 ESCC cases were randomly selected for western blot analysis. The effect of miR-21 on PTEN expression was assessed in the ESCC cell line with an miR-21 inhibitor to reduce miR-21 expression. Furthermore, the roles of miR-21 in cell biology were analyzed by use of miR-21 inhibitor-transfected cells. RESULTS Stem-loop RT-PCR revealed miR-21 was significantly overexpressed in ESCC tissues and cell lines. Overexpression of miR-21 correlated with tumor status, lymph node metastasis, and clinical stage. We demonstrated that knockdown of miR-21 significantly increased expression of PTEN protein. Consequent PTEN expression reduced cell proliferation, invasion, and migration. CONCLUSIONS Our findings suggest that miR-21 could be a potential oncomiR, probably by regulation of PTEN, and a novel prognostic factor for ESCC patients.
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Affiliation(s)
- Pei Li
- Department of Pathophysiology, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou, 450052, People's Republic of China,
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141
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Nosho K, Igarashi H, Nojima M, Ito M, Maruyama R, Yoshii S, Naito T, Sukawa Y, Mikami M, Sumioka W, Yamamoto E, Kurokawa S, Adachi Y, Takahashi H, Okuda H, Kusumi T, Hosokawa M, Fujita M, Hasegawa T, Okita K, Hirata K, Suzuki H, Yamamoto H, Shinomura Y. Association of microRNA-31 with BRAF mutation, colorectal cancer survival and serrated pathway. Carcinogenesis 2013; 35:776-83. [PMID: 24242331 DOI: 10.1093/carcin/bgt374] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
BRAF is an important gene in colorectal cancers (CRCs) that is associated with molecular characterization and resistance to targeted therapy. Although microRNAs (miRNAs) are useful biomarkers of various cancers, the association between miRNA and BRAF in CRCs is undefined. Therefore, this study was conducted to identify a relationship between specific miRNA molecules and BRAF mutation in CRCs and serrated lesions. miRNA array was used for the measurement of 760 miRNAs in 29 CRCs. To assess the identified miRNAs, quantitative reverse transcription-PCR was performed on 721 CRCs, 381 serrated lesions and 251 non-serrated adenomas. Moreover, proliferation and invasion assays were conducted using cell lines. miRNA array analysis revealed that microRNA-31 (miR-31)-5p was the most up-regulated miRNA in CRCs with mutated BRAF (V600E) compared with CRCs possessing wild-type BRAF (including cases with KRAS mutation). High miR-31 expression was associated with BRAF and KRAS mutations and proximal location (P < 0.0001). High miR-31 expression was related to cancer-specific mortality [multivariate hazard ratio = 2.06, 95% confidence interval: 1.36-3.09, P = 0.0008]. Functional analysis demonstrated that miR-31 inhibitor decreased cell invasion and proliferation. With regard to serrated lesions, high miR-31 expression was less frequently detected in hyperplastic polyps compared with other serrated lesions. In conclusion, associations were identified between miR-31, BRAF and prognosis in CRC. Transfection of miR-31 inhibitor had an antitumour effect. Thus, miR-31 may be a promising diagnostic biomarker and therapeutic target in colon cancers. Moreover, high miR-31 expression in serrated lesions suggested that miR-31 may be a key molecule in serrated pathway.
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Affiliation(s)
- Katsuhiko Nosho
- Department of Gastroenterology, Rheumatology and Clinical Immunology, Sapporo Medical University School of Medicine, Sapporo, Japan
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142
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Zhu Y, Yang P, Zhang X, Zhang L, Cui G, Wang Q, Lv L, Zhang Y, Xin X, Yan T, Zhao M, Zhang N. The effect and mechanism of CXCR4 silencing on metastasis suppression of human glioma U87 cell line. Anat Rec (Hoboken) 2013; 296:1857-64. [PMID: 24249397 DOI: 10.1002/ar.22825] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2013] [Accepted: 09/25/2013] [Indexed: 11/09/2022]
Abstract
Tumor metastasis is the major cause of treatment failure and poor prognosis of glioma. Inhibiting metastasis has become an important therapeutic strategy for glioma treatment. CXCR4 has been proved to play an important role in the occurrence and development of tumors. In order to illustrate the effect of CXCR4 on glioma metastasis, we investigated the role of CXCR4 in U87 cells metastasis based on the CXCR4 silencing tumor cells. In this study, we found that CXCR4 silencing could suppress U87 cells invasion and adhesion potential, production of TGF-β1, IL-6, and IL-8, and blocked the G0/G1 phase of the cell cycle. We also found that CXCR4 silencing could up-regulate the mRNA and protein expression of p53, p21, and E-cadherin, and down-regulate the mRNA and protein expression of CD44 and MMP-2/-9. Meanwhile, CXCR4 silencing could decrease the phosphorylation of p-AKT and transcription activity of NF-κB promoter, and increased the phosphorylation of PTEN. The results provided a new research basis for the further study of CXCR4 gene, the screening of human glioma, as well as the target treatment for glioma and its prognosis.
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Affiliation(s)
- Yu Zhu
- Department of Clinical Laboratory, Tianjin Huan Hu Hospital, Tianjin, 300060, China; Tianjin Key Laboratory of Cerebral Vessels and Neural Degeneration, Tianjin, 300060, China
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143
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miR-21-containing microvesicles from injured tubular epithelial cells promote tubular phenotype transition by targeting PTEN protein. THE AMERICAN JOURNAL OF PATHOLOGY 2013; 183:1183-1196. [PMID: 23978520 DOI: 10.1016/j.ajpath.2013.06.032] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2013] [Revised: 06/09/2013] [Accepted: 06/24/2013] [Indexed: 01/21/2023]
Abstract
Renal fibrosis is inevitably progressive no matter what the initial insult is or whether the insult persists. In an experimental fibrosis model induced by unilateral ureteral obstruction, the accelerated pathological changes could hardly be explained by aggravated pressure caused by hydronephrosis after ligation. Moreover, at the initial stage, tubular phenotype transition and matrix deposition in obstructive kidneys are always local and scattered; however, these renal lesions expand and progress with time. In this study, cultured recipient tubular cells underwent phenotype transition after incubation with conditioned media derived from transforming growth factor-β1-treated donor tubular cells. Thus, it is reasonable to speculate that some secretable molecules from injured tubules contribute to the progression of renal fibrosis. Herein, we report that secreted miRNA-21 (miR-21) can serve as the molecule mediating intercellular communication. miR-21 was packaged into microvesicles, which enter and deliver miR-21 into recipient tubular cells, and exogenous miR-21 enhances Akt signaling by target depression of phosphatase and tensin homolog (PTEN) protein, and promotes tubular phenotype transition. These results demonstrate that tubular cells can secrete miR-21 and deliver it into recipient tubules by microvesicles, where the exogenous miR-21 can target PTEN protein and enhance Akt signaling in recipient cells. Microvesicle-mediated delivery of miR-21 among tubular epithelial cells might shed new light on the mechanism of progressive renal fibrosis.
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144
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Hong L, Han Y, Zhang Y, Zhang H, Zhao Q, Wu K, Fan D. MicroRNA-21: a therapeutic target for reversing drug resistance in cancer. Expert Opin Ther Targets 2013; 17:1073-80. [PMID: 23865553 DOI: 10.1517/14728222.2013.819853] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
INTRODUCTION Drug resistance is a major clinical obstacle to the successful treatment of human cancer. The microRNAs-21 (miR-21), an oncomiR, may play an important role in the progress of drug resistance. AREAS COVERED This review covers all related literature on miR-21 in drug resistance of human cancers and analyzes the expression, biological functions and targets of it. This study also envisages future developments toward its clinical and therapeutic applications in cancer treatment. EXPERT OPINION The miR-21 may promote the drug resistance of various cancers. Inhibitors of miR-21 may function as effective approaches for reversing drug resistance in cancer cells. There is a tough way from discovering the function of miR-21 to clinical use. Further understanding of miR-21-mediated signaling pathways will help to promote the therapeutic-clinical use of miR-21 in cancer.
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Affiliation(s)
- Liu Hong
- Fourth Military Medical University, State Key Laboratory of Cancer Biology & Xijing Hospital of Digestive Diseases, Xi'an, 710032, Shaanxi Province, China.
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145
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Mlcochova J, Faltejskova P, Nemecek R, Svoboda M, Slaby O. MicroRNAs targeting EGFR signalling pathway in colorectal cancer. J Cancer Res Clin Oncol 2013; 139:1615-24. [PMID: 23817698 DOI: 10.1007/s00432-013-1470-9] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2013] [Accepted: 06/21/2013] [Indexed: 12/12/2022]
Abstract
MicroRNAs (miRNAs) are short, 18-25-nucleotide long, non-coding single-stranded RNAs, which are capable to regulate gene expression on post-transcriptional level through binding to their target protein-encoding mRNAs. miRNAs regulate individual components of multiple oncogenic pathways. One of them is epidermal growth factor receptor (EGFR) signalling pathway that regulates cell proliferation, differentiation, migration, angiogenesis and apoptosis. All these processes are deregulated in colorectal cancer (CRC). Moreover, EGFR has been validated as the therapeutic target in CRC, and monoclonal antibodies cetuximab and panitumumab are used in the therapy of patients with metastatic CRC. Because of the extensive involvement of miRNAs in the regulation of EGFR signalling, it seems they could also serve as promising predictive biomarkers to anti-EGFR therapy. In this review, we summarize current knowledge about miRNAs targeting EGFR signalling pathway, their functioning in CRC pathogenesis and potential usage as biomarkers.
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Affiliation(s)
- Jitka Mlcochova
- Department of Comprehensive Cancer Care, Masaryk Memorial Cancer Institute, Zluty kopec 7, 656 53, Brno, Czech Republic, Europe
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Abstract
Epstein-Barr virus (EBV) positive diffuse large B-cell lymphoma (DLBCL) of the elderly, initially described in 2003, is a provisional entity in the 2008 World Health Organization classification system and is defined as an EBV-positive monoclonal large B-cell proliferation that occurs in patients >50 years of age and in whom there is no known immunodeficiency or history of lymphoma. These tumors are more common in Asia but also occur in North America and Europe at a low frequency. These neoplasms exhibit a morphologic continuum, from polymorphous to monomorphous, but morphologic features do not correlate with prognosis as all patients have a clinically aggressive course. Most EBV-positive DLBCL of the elderly patients have an activated B-cell immunophenotype and are characterized by prominent nuclear factor-κB activation. Cytogenetic complexity is usually low. In this review, we comprehensively delineate the data emerging from analyses of EBV latency program, microRNA-mediated EBV viral oncogenesis, functional genomics of EBV and its biology, and differential diagnosis challenge for EBV-positive DLBCL of the elderly. It is hoped that the improved understanding of these tumors will lead to the development of novel therapeutic approaches, enhance the effectiveness of clinical trials, and improve prognosis.
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147
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Huang B, Luo W, Sun L, Zhang Q, Jiang L, Chang J, Qiu X, Wang E. MiRNA-125a-3p is a negative regulator of the RhoA-actomyosin pathway in A549 cells. Int J Oncol 2013; 42:1734-42. [PMID: 23525486 DOI: 10.3892/ijo.2013.1861] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2012] [Accepted: 02/15/2013] [Indexed: 11/05/2022] Open
Abstract
MicroRNAs (miRNAs) function as genetic modulators that regulate gene expression, and are, thus, involved in a wide range of biological roles, including tumor cell migration and invasion. MiR-125a-3p is a mature form of miR-125a, derived from the 3'-end of pre-miR-125a. Our group has previously reported that miR-125a-3p functions as a tumor suppressor gene that inhibits the migration and invasion of lung cancer cells. Here, we report the discovery of a new regulatory layer of the RhoA-actomyosin pathway through which miR-125a-3p controls tumor cell migration. Overexpression of miR-125a-3p by transfection of sense‑miR‑125a-3p resulted in decreased RhoA protein levels, while the levels of RhoA mRNA remained constant. The concentrations of both RhoA-GTP protein and actin filaments decreased after miR-125a-3p overexpression in the A549 lung cancer cell line. Conversely, knockdown of miR-125a-3p by transfection of antisense-miR-125a-3p resulted in increased RhoA protein levels while the levels of RhoA mRNA remained unchanged. However, the concentration of both RhoA-GTP protein and actin filaments increased. To further demonstrate that RhoA is a potential target of miR‑125a-3p, luciferase reporter constructs containing the RhoA 3'UTR demonstrated reduced reporter activity after ectopic expression of miR-125a-3p. Moreover, luciferase reporter constructs containing the RhoA 3'UTR mutant did not show significantly changed reporter activity. Furthermore, A549 cells demonstrated reduced migratory capacity after treatment with the Rho inhibitor CT04. Our results indicate that the loss of miR-125a‑3p-controlled regulation of the RhoA-actomyosin pathway can lead to increased migration of tumor cells because of the upregulation of RhoA expression. In particular, an increased intracellular concentration of RhoA-GTP protein in A549 cells leads to the accumulation of actin filaments. These results provide new insights into the role of the miR-125a family in lung cancer.
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Affiliation(s)
- Bo Huang
- Department of Pathology, First Affiliated Hospital and College of Basic Medical Sciences, China Medical University, Heping, Shenyang, Liaoning 110001, PR China
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