51
|
Zhang C, Chen X, Chen X, Wang X, Ji A, Jiang L, Sang F, Li F. miR-135a acts as a tumor suppressor in gastric cancer in part by targeting KIFC1. Onco Targets Ther 2016; 9:3555-63. [PMID: 27366092 PMCID: PMC4913988 DOI: 10.2147/ott.s105736] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
miR-135a was downregulated in the majority of human primary gastric cancer (GC) tissues and GC cell lines. Kinesin family member C1 (KIFC1) was significantly upregulated in GC tissues and cell lines and promoted GC development and progression. We searched for miR-135a targets by using MiRanda, TargetScan, and PicTar tools, and found that KIFC1 was a potential target of miR-135a. Based on these findings, we speculated that miR-135a might target KIFC1 to inhibit GC growth. We determined the expression of miR-135a and KIFC1 by quantitative real-time polymerase chain reaction and Western blot assays, respectively, and found downregulation of miR-135a and upregulation of KIFC1 in GC tissues and cell lines. Cell proliferation and apoptosis assays showed that knockdown of KIFC1 inhibited proliferation and promoted apoptosis of GC cells, and miR-135a mimics had similar effects on GC cell proliferation and apoptosis. Furthermore, we verified that KIFC1 was a direct target of miR-135a, which confirmed our speculation that the functional effect of miR-135a on GC cells, at least, in part, depends on KIFC1. These findings suggest that miR-135a has an important role in the suppression of GC and presents a novel mechanism of miRNA-mediated KIFC1 expression in cancer cells.
Collapse
Affiliation(s)
- Chuanlei Zhang
- Department of Digestive Diseases, The First Affiliated Hospital of Henan University of Traditional Chinese Medicine, Zhengzhou, People's Republic of China
| | - Xiaoqi Chen
- Department of Digestive Diseases, The First Affiliated Hospital of Henan University of Traditional Chinese Medicine, Zhengzhou, People's Republic of China
| | - Xinju Chen
- Department of Digestive Diseases, The First Affiliated Hospital of Henan University of Traditional Chinese Medicine, Zhengzhou, People's Republic of China
| | - Xinting Wang
- Department of Digestive Diseases, The First Affiliated Hospital of Henan University of Traditional Chinese Medicine, Zhengzhou, People's Republic of China
| | - Aiying Ji
- Department of Digestive Diseases, The First Affiliated Hospital of Henan University of Traditional Chinese Medicine, Zhengzhou, People's Republic of China
| | - Lifeng Jiang
- Department of Chinese Traditional and Western Medicine, Henan Cancer Hospital, Affiliated Cancer Hospital of Zhengzhou University, Zhengzhou, People's Republic of China
| | - Feng Sang
- Department of Acquired Immune Deficiency Syndrome Treatment and Research Center, Key Laboratory of Viral Diseases Prevention and Treatment of Traditional Chinese Medicine of Henan Province, Zhengzhou, People's Republic of China
| | - Fucheng Li
- The First Affiliated Hospital of Henan University of Traditional Chinese Medicine, Zhengzhou, People's Republic of China
| |
Collapse
|
52
|
BCR/ABL increases EZH2 levels which regulates XIAP expression via miRNA-219 in chronic myeloid leukemia cells. Leuk Res 2016; 45:24-32. [DOI: 10.1016/j.leukres.2016.03.012] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2015] [Revised: 03/10/2016] [Accepted: 03/31/2016] [Indexed: 11/20/2022]
|
53
|
Crea F, Venalainen E, Ci X, Cheng H, Pikor L, Parolia A, Xue H, Nur Saidy NR, Lin D, Lam W, Collins C, Wang Y. The role of epigenetics and long noncoding RNA MIAT in neuroendocrine prostate cancer. Epigenomics 2016; 8:721-31. [PMID: 27096814 DOI: 10.2217/epi.16.6] [Citation(s) in RCA: 79] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Neuroendocrine prostate cancer (NEPC) is the most lethal prostatic neoplasm. NEPC is thought to originate from the transdifferentiation of AR-positive adenocarcinoma cells. We have previously shown that an epigenetic/noncoding interactome (ENI) orchestrates cancer cells' plasticity, thereby allowing the emergence of metastatic, drug-resistant neoplasms. The primary objective of this manuscript is to discuss evidence indicating that some components of the ENI (Polycomb genes, miRNAs) play a key role in NEPC initiation and progression. Long noncoding RNAs represent vast and largely unexplored component of the ENI. Their role in NEPC has not been investigated. We show preliminary evidence indicating that a lncRNA (MIAT) is selectively upregulated in NEPCs and might interact with Polycomb genes. Our results indicate that long noncoding RNAs can be exploited as new biomarkers and therapeutic targets for NEPC.
Collapse
Affiliation(s)
- Francesco Crea
- Experimental Therapeutics, BC Cancer Agency Cancer Research Centre, Vancouver, BC, Canada.,Department of Life Health & Chemical Sciences, The Open University, Milton Keynes, UK
| | - Erik Venalainen
- Experimental Therapeutics, BC Cancer Agency Cancer Research Centre, Vancouver, BC, Canada
| | - Xinpei Ci
- Experimental Therapeutics, BC Cancer Agency Cancer Research Centre, Vancouver, BC, Canada.,Vancouver Prostate Centre, Department of Urologic Sciences, University of British Columbia, Vancouver, BC, Canada
| | - Hongwei Cheng
- Experimental Therapeutics, BC Cancer Agency Cancer Research Centre, Vancouver, BC, Canada.,Vancouver Prostate Centre, Department of Urologic Sciences, University of British Columbia, Vancouver, BC, Canada
| | - Larissa Pikor
- Genetics Unit, Integrative Oncology, BC Cancer Agency Cancer Research Centre, Vancouver, BC, Canada
| | - Abhijit Parolia
- Experimental Therapeutics, BC Cancer Agency Cancer Research Centre, Vancouver, BC, Canada
| | - Hui Xue
- Experimental Therapeutics, BC Cancer Agency Cancer Research Centre, Vancouver, BC, Canada
| | - Nur Ridzwan Nur Saidy
- Experimental Therapeutics, BC Cancer Agency Cancer Research Centre, Vancouver, BC, Canada
| | - Dong Lin
- Experimental Therapeutics, BC Cancer Agency Cancer Research Centre, Vancouver, BC, Canada.,Vancouver Prostate Centre, Department of Urologic Sciences, University of British Columbia, Vancouver, BC, Canada
| | - Wan Lam
- Genetics Unit, Integrative Oncology, BC Cancer Agency Cancer Research Centre, Vancouver, BC, Canada
| | - Colin Collins
- Vancouver Prostate Centre, Department of Urologic Sciences, University of British Columbia, Vancouver, BC, Canada
| | - Yuzhuo Wang
- Experimental Therapeutics, BC Cancer Agency Cancer Research Centre, Vancouver, BC, Canada.,Vancouver Prostate Centre, Department of Urologic Sciences, University of British Columbia, Vancouver, BC, Canada
| |
Collapse
|
54
|
Yang Q, Laknaur A, Elam L, Ismail N, Gavrilova-Jordan L, Lue J, Diamond MP, Al-Hendy A. Identification of Polycomb Group Protein EZH2-Mediated DNA Mismatch Repair Gene MSH2 in Human Uterine Fibroids. Reprod Sci 2016; 23:1314-25. [PMID: 27036951 DOI: 10.1177/1933719116638186] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Uterine fibroids (UFs) are benign smooth muscle neoplasms affecting up to 70% of reproductive age women. Treatment of symptomatic UFs places a significant economic burden on the US health-care system. Several specific genetic abnormalities have been described as etiologic factors of UFs, suggesting that a low DNA damage repair capacity may be involved in the formation of UF. In this study, we used human fibroid and adjacent myometrial tissues, as well as an in vitro cell culture model, to evaluate the expression of MutS homolog 2 (MSH2), which encodes a protein belongs to the mismatch repair system. In addition, we deciphered the mechanism by which polycomb repressive complex 2 protein, EZH2, deregulates MSH2 in UFs. The RNA expression analysis demonstrated the deregulation of MSH2 expression in UF tissues in comparison to its adjacent myometrium. Notably, protein levels of MSH2 were upregulated in 90% of fibroid tissues (9 of 10) as compared to matched adjacent myometrial tissues. Human fibroid primary cells treated with 3-deazaneplanocin A (DZNep), chemical inhibitor of EZH2, exhibited a significant increase in MSH2 expression (P < .05). Overexpression of EZH2 using an adenoviral vector approach significantly downregulated the expression of MSH2 (P < .05). Chromatin immunoprecipitation assay demonstrated that enrichment of H3K27me3 in promoter regions of MSH2 was significantly decreased in DZNep-treated fibroid cells as compared to vehicle control. These data suggest that EZH2-H3K27me3 regulatory mechanism dynamically changes the expression levels of DNA mismatch repair gene MSH2, through epigenetic mark H3K27me3. MSH2 may be considered as a marker for early detection of UFs.
Collapse
Affiliation(s)
- Qiwei Yang
- Division of Translational Research, Department of Obstetrics and Gynecology, Medical College of Georgia, Augusta University, Augusta, GA, USA
| | - Archana Laknaur
- Division of Translational Research, Department of Obstetrics and Gynecology, Medical College of Georgia, Augusta University, Augusta, GA, USA
| | - Lelyand Elam
- Division of Translational Research, Department of Obstetrics and Gynecology, Medical College of Georgia, Augusta University, Augusta, GA, USA
| | - Nahed Ismail
- Clinical Microbiology Division, Department of Pathology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Larisa Gavrilova-Jordan
- Division of Translational Research, Department of Obstetrics and Gynecology, Medical College of Georgia, Augusta University, Augusta, GA, USA
| | - John Lue
- Division of Translational Research, Department of Obstetrics and Gynecology, Medical College of Georgia, Augusta University, Augusta, GA, USA
| | - Michael P Diamond
- Division of Translational Research, Department of Obstetrics and Gynecology, Medical College of Georgia, Augusta University, Augusta, GA, USA
| | - Ayman Al-Hendy
- Division of Translational Research, Department of Obstetrics and Gynecology, Medical College of Georgia, Augusta University, Augusta, GA, USA
| |
Collapse
|
55
|
Yang M, Cui G, Ding M, Yang W, Liu Y, Dai D, Chen L. miR-935 promotes gastric cancer cell proliferation by targeting SOX7. Biomed Pharmacother 2016; 79:153-8. [PMID: 27044823 DOI: 10.1016/j.biopha.2016.01.011] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Revised: 12/29/2015] [Accepted: 01/13/2016] [Indexed: 01/12/2023] Open
Abstract
Gastric cancer is the most common cancer in the world, miRNAs have been demonstrated to play critical role in the development and progression of gastric cancer, such as miR-7, miR-217 and miR-335. Here, we found miR-935 was upregulated in gastric cancer tissues and cells. Overexpression of miR-935 promoted cell proliferation and tumorigenesis in vitro determined by MTT analysis, colony formation analysis, BrdU cell proliferation analysis and soft agar growth analysis, knockdown of miR-935 reduced these effects. Tumor suppressor sex-determining region Y-box 7 (SOX7) was the direct target of miR-935, overexpression of miR-935 inhibited SOX7 expression, but promoted the levels CCND1 and C-MYC which promotes cell proliferation and tumorigenesis, knockdown of miR-935 increased SOX7 level, and inhibited CCND1 and C-MYC expression. Synchronous knockdown of miR-935 and SOX7 promoted cell proliferation and tumorigenesis in vitro, confirming miR-935 regulated gastric cancer cell proliferation by inhibiting SOX7. In summary, we found miR-935 contributed to cell proliferation of gastric cancer through targeting SOX7.
Collapse
Affiliation(s)
- Meng Yang
- The Second Department of Tumor Surgery, Cangzhou Central Hospital, Cangzhou, Hebei, China
| | - Guozhong Cui
- The Second Department of Tumor Surgery, Cangzhou Central Hospital, Cangzhou, Hebei, China
| | - Mingjian Ding
- The Second Department of Tumor Surgery, Cangzhou Central Hospital, Cangzhou, Hebei, China
| | - Wenhua Yang
- The Second Department of Tumor Surgery, Cangzhou Central Hospital, Cangzhou, Hebei, China
| | - Yanqing Liu
- The Second Department of Tumor Surgery, Cangzhou Central Hospital, Cangzhou, Hebei, China
| | - Dianlu Dai
- The Second Department of Tumor Surgery, Cangzhou Central Hospital, Cangzhou, Hebei, China
| | - Liang Chen
- The Second Department of Tumor Surgery, Cangzhou Central Hospital, Cangzhou, Hebei, China.
| |
Collapse
|
56
|
Zhu H, Hou L, Liu J, Li Z. MiR-217 is down-regulated in psoriasis and promotes keratinocyte differentiation via targeting GRHL2. Biochem Biophys Res Commun 2016; 471:169-76. [PMID: 26826389 DOI: 10.1016/j.bbrc.2016.01.157] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2015] [Revised: 01/16/2016] [Accepted: 01/25/2016] [Indexed: 11/25/2022]
Abstract
MiR-217 is a well-known tumor suppressor, and its down-regulation has been shown in a wide range of solid and leukaemic cancers. However, the biological role of miR-217 in psoriasis pathogenesis, especially in keratinocyte hyperproliferation and differentiation, is not clearly understood. In this study, we found the expression of miR-217 was markedly down-regulated in psoriasis keratinocytes of psoriatic patients. In addition, overexpression of miR-217 inhibited the proliferation and promoted the differentiation of primary human keratinocytes. On the contrary, inhibition of endogenous miR-217 increased cell proliferation and delayed differentiation. Furthermore, Grainyhead-like 2 (GRHL2) was identified as a direct target of miR-217 by luciferase reporter assay. The expression of miR-217 and GRHL2 was inversely correlated in both transfected keratinocytes and in psoriasis lesional skin. Moreover, knocking down GRHL2 expression by siRNA enhanced keratinocyte differentiation. Taken together, our results demonstrate a role for miR-217 in the regulation of keratinocyte differentiation, partially through the regulation of GRHL2.
Collapse
Affiliation(s)
- Haigang Zhu
- Department of Dermatology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325000, China
| | - Liyue Hou
- Department of Dermatology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325000, China
| | - Jingjing Liu
- Department of Dermatology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325000, China
| | - Zhiming Li
- Department of Dermatology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325000, China.
| |
Collapse
|
57
|
Yan W, Qian L, Chen J, Chen W, Shen B. Comparison of Prognostic MicroRNA Biomarkers in Blood and Tissues for Gastric Cancer. J Cancer 2016; 7:95-106. [PMID: 26722365 PMCID: PMC4679386 DOI: 10.7150/jca.13340] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2015] [Accepted: 10/18/2015] [Indexed: 12/11/2022] Open
Abstract
Gastric cancer (GC) still keeps up high mortality worldwide with poor prognosis. Efficient and non-invasive prognostic biomarkers are urgently needed. MicroRNAs are non-coding RNAs playing roles in post-transcriptional gene regulation, which contribute to various biological processes such as development, differentiation and carcinogenesis. MicroRNA expression profiles have been associated with the prognosis and outcome in GC. MicroRNA prognostic biomarkers have been identified from blood or tissues samples, but with different prognostic features. Understanding the various roles of microRNAs in different sample sources of GC will provide deep insights into GC progression. In this review, we highlight the distinct prognostic roles of microRNAs biomarkers in blood and tissue according to their relationships with prognostic parameters, survival rates and target pathways. This will be useful for non-invasive biomarker development and selection in prognosis of GC.
Collapse
Affiliation(s)
- Wenying Yan
- 1. Department of Gastroenterology, The First Affiliated Hospital of Soochow University, Suzhou 215006, China; ; 2. Taicang Center for Translational Bioinformatics, Taicang 215400, China; ; 3. Center for Systems Biology, Soochow University, Suzhou 215006, China
| | - Laijun Qian
- 4. Daibu Center Hospital, Liyang, 213330, China
| | - Jiajia Chen
- 5. School of Chemistry, Biology and Material Engineering, Suzhou University of Science and Technology, Suzhou 215011, China
| | - Weichang Chen
- 1. Department of Gastroenterology, The First Affiliated Hospital of Soochow University, Suzhou 215006, China
| | - Bairong Shen
- 3. Center for Systems Biology, Soochow University, Suzhou 215006, China
| |
Collapse
|
58
|
Li J, Li D, Zhang W. Tumor suppressor role of miR-217 in human epithelial ovarian cancer by targeting IGF1R. Oncol Rep 2015; 35:1671-9. [PMID: 26708715 DOI: 10.3892/or.2015.4498] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2015] [Accepted: 11/08/2015] [Indexed: 11/06/2022] Open
Abstract
Accumulating evidence shows that microRNA-217 (miR-217) is frequently dysregulated in various cancers, and plays crucial roles in tumorigenesis and metastasis; however, the role and underlying molecular mechanism of miR-217 in human epithelial ovarian cancer (EOC) remains unclear. Here, we report that miR-217 expression was downregulated in EOC tissue and inversely correlated with advanced FIGO stage, high histological grading and lymph node metastasis (P<0.01). Function analysis revealed that the ectopic expression of miR-217 in EOC cells inhibited cell proliferation, migration and invasion in vitro, as well as suppressed tumor growth in vivo. Bioinformatics analysis and dual luciferase assays identified insulin-like growth factor 1 receptor (IGF1R) as a direct target of miR-217 in EOC cells. Western blot assay showed that overexpression of miR-217 in EOC cells inhibited IGF1R expression. In addition, downregulation of IGF1R mimicked the tumor-suppressive effects of miR-217 in EOC cells, whereas the reintroduction of IGF1R partially abrogated the suppression effect induced by miR-217 on EOC cells. Collectively, these results demonstrated that miR-217 plays a tumor suppressor role in human epithelial ovarian cancer by directly targeting IGF1R gene, suggesting a new potential therapeutic target in EOC.
Collapse
Affiliation(s)
- Jieyan Li
- Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing 100026, P.R. China
| | - Dongmei Li
- Special Education Department of Changchun University, Changchun, Jilin 130022, P.R. China
| | - Weiyuan Zhang
- Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing 100026, P.R. China
| |
Collapse
|
59
|
Chang JW, Gwak SY, Shim GA, Liu L, Lim YC, Kim JM, Jung MG, Koo BS. EZH2 is associated with poor prognosis in head-and-neck squamous cell carcinoma via regulating the epithelial-to-mesenchymal transition and chemosensitivity. Oral Oncol 2015; 52:66-74. [PMID: 26604082 DOI: 10.1016/j.oraloncology.2015.11.002] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2015] [Revised: 10/26/2015] [Accepted: 11/04/2015] [Indexed: 01/11/2023]
Abstract
OBJECTIVES Increasing evidence suggests that epigenetic regulation is responsible for tumor initiation and progression in head and neck squamous cell carcinoma (HNSCC). Although the polycomb group protein enhancer zeste homolog 2 (EZH2) is upregulated and a key epigenetic modifier implicated in various cancers, its molecular mechanism in HNSCC remains unknown. Herein, we investigated the role of EZH2 in HNSCC progression and its clinical implication as an HNSCC risk predictor. MATERIALS AND METHOD A retrospective analysis was performed on 90 HNSCC patients who had curative surgery between 1999 and 2011. Patients with high and low EZH2 expression were compared by the various clinicopathological factors. Survival rates were estimated by the Kaplan-Meier method and log-rank test was used to determine significance. For functional in vitro analysis, migration/invasion assay and Western blotting were performed after EZH2 knockdown using siRNA. In addition, cell proliferation was measured to clarify the role of EZH2 on cisplatin chemotherapy. RESULTS In patients with HNSCC, high EZH2 expression was correlated with advanced T stage and poor survival outcome. RNAi analysis revealed that EZH2 silencing increased E-cadherin expression while decreasing that of N-cadherin and Vimentin without altering Snail/Slug signaling, which led to decreased cell migration/invasion. EZH2 is also associated with tumor aggressiveness via regulating the epithelial-to-mesenchymal transition. Furthermore, we show that high EZH2 expression decreases sensitivity to cisplatin-based chemotherapy. CONCLUSION Our results indicate that EZH2 may not be only a predictive and prognostic biomarker but also a potential personalized therapeutic target for the treatment of HNSCC.
Collapse
Affiliation(s)
- Jae Won Chang
- Department of Otolaryngology-Head and Neck Surgery, Research Institute for Medical Science, Chungnam National University College of Medicine, Daejeon, Republic of Korea
| | - Seo Young Gwak
- Department of Otolaryngology-Head and Neck Surgery, Research Institute for Medical Science, Chungnam National University College of Medicine, Daejeon, Republic of Korea
| | - Geun-Ae Shim
- Department of Otolaryngology-Head and Neck Surgery, Research Institute for Medical Science, Chungnam National University College of Medicine, Daejeon, Republic of Korea
| | - Lihua Liu
- Department of Otolaryngology-Head and Neck Surgery, Research Institute for Medical Science, Chungnam National University College of Medicine, Daejeon, Republic of Korea
| | - Young Chang Lim
- Department of Otorhinolaryngology-Head and Neck Surgery, Research Institute of Medical Science, Konkuk University School of Medicine, Seoul, Republic of Korea
| | - Jin Man Kim
- Research Institute for Medical Sciences and Pathology, Chungnam National University College of Medicine, Daejeon, Republic of Korea
| | - Min Gyu Jung
- Research Institute for Medical Sciences and Pathology, Chungnam National University College of Medicine, Daejeon, Republic of Korea
| | - Bon Seok Koo
- Department of Otolaryngology-Head and Neck Surgery, Research Institute for Medical Science, Chungnam National University College of Medicine, Daejeon, Republic of Korea.
| |
Collapse
|
60
|
Ren F, Zhang X, Liang H, Luo D, Rong M, Dang Y, Chen G. Prognostic significance of MiR-34a in solid tumors: a systemic review and meta-analysis with 4030 patients. Int J Clin Exp Med 2015; 8:17377-17391. [PMID: 26770329 PMCID: PMC4694229] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2015] [Accepted: 10/09/2015] [Indexed: 06/05/2023]
Abstract
PURPOSE The aim of the present meta-analysis and systematic review was to explore the association between the expression of miR-34a and prognosis in solid tumor. METHODS PubMed, Google Scholar, Web of Science and NCBI databases were used to search studies to evaluate the effect of miR-34a expression on clinical outcomes, including overall survival (OS), recurrence-free survival (RFS), disease-free survival (DFS), progression-free survival (PFS) and event-free survival (EFS) in solid tumor. The pooled random effect models were performed to calculate pooled hazard ratio (HR), 95% confidence interval (CI) to assess the association. RESULTS Twenty-three eligible studies with 4030 patients were included in this meta-analysis. It was confirmed that increased expression of miR-34a was in relevant with better DFS/RFS/PFS/EFS, which was identified with both univariate and multivariate models (univariate model: HR = 0.62, 95% CI: 0.42-0.92, P = 0.019; multivariate model: HR = 0.55, 95% CI: 0.34-0.88, P = 0.013). Furthermore, in the analysis of relationship between miR-34a and DFS/RFS/PFS/EFS, the results remained similar when excluding the studies contributed to the heterogeneity (univariate analysis: HR = 0.57, 95% CI: 0.46-0.70, P < 0.001; multivariate analysis: HR = 0.57, 95% CI: 0.43-0.75, P < 0.001). With univariate analysis, it was also demonstrated that miR-34a overexpression might be positively associated with a favorable OS in solid tumor (HR = 0.73, 95% CI: 0.54-1.00, P = 0.005) with considering an obvious heterogeneity. CONCLUSION Our current study supports the notion that miR-34a may be a potential biomarker to predict OS and RFS/PFS/DFS/EFS in solid tumor.
Collapse
Affiliation(s)
- Fanghui Ren
- Department of Pathology, First Affiliated Hospital of Guangxi Medical UniversityNanning 530021, Guangxi Zhuang Autonomous Region, P. R. China
| | - Xin Zhang
- Department of Pathology, First Affiliated Hospital of Guangxi Medical UniversityNanning 530021, Guangxi Zhuang Autonomous Region, P. R. China
| | - Haiwei Liang
- Department of Pathology, First Affiliated Hospital of Guangxi Medical UniversityNanning 530021, Guangxi Zhuang Autonomous Region, P. R. China
| | - Dianzhong Luo
- Department of Pathology, First Affiliated Hospital of Guangxi Medical UniversityNanning 530021, Guangxi Zhuang Autonomous Region, P. R. China
| | - Minhua Rong
- Department of Research, Affiliated Cancer Hospital, Guangxi Medical UniversityNanning 530021, Guangxi Zhuang Autonomous Region, P. R. China
| | - Yiwu Dang
- Department of Pathology, First Affiliated Hospital of Guangxi Medical UniversityNanning 530021, Guangxi Zhuang Autonomous Region, P. R. China
| | - Gang Chen
- Department of Pathology, First Affiliated Hospital of Guangxi Medical UniversityNanning 530021, Guangxi Zhuang Autonomous Region, P. R. China
| |
Collapse
|
61
|
Lu L, Luo F, Liu Y, Liu X, Shi L, Lu X, Liu Q. Posttranscriptional silencing of the lncRNA MALAT1 by miR-217 inhibits the epithelial-mesenchymal transition via enhancer of zeste homolog 2 in the malignant transformation of HBE cells induced by cigarette smoke extract. Toxicol Appl Pharmacol 2015; 289:276-85. [PMID: 26415832 DOI: 10.1016/j.taap.2015.09.016] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2015] [Revised: 09/21/2015] [Accepted: 09/24/2015] [Indexed: 01/07/2023]
Abstract
Lung cancer is regarded as the leading cause of cancer-related deaths, and cigarette smoking is one of the strongest risk factors for the development of lung cancer. However, the mechanisms for cigarette smoke-induced lung carcinogenesis remain unclear. The present study investigated the effects of an miRNA (miR-217) on levels of an lncRNA (MALAT1) and examined the role of these factors in the epithelial-mesenchymal transition (EMT) induced by cigarette smoke extract (CSE) in human bronchial epithelial (HBE) cells. In these cells, CSE caused decreases of miR-217 levels and increases in lncRNA MALAT1 levels. Over-expression of miR-217 with a mimic attenuated the CSE-induced increase of MALAT1 levels, and reduction of miR-217 levels by an inhibitor enhanced expression of MALAT1. Moreover, the CSE-induced increase of MALAT1 expression was blocked by an miR-217 mimic, indicating that miR-217 negatively regulates MALAT1 expression. Knockdown of MALAT1 reversed CSE-induced increases of EZH2 (enhancer of zeste homolog 2) and H3K27me3 levels. In addition to the alteration from epithelial to spindle-like mesenchymal morphology, chronic exposure of HBE cells to CSE increased the levels of EZH2, H3K27me3, vimentin, and N-cadherin and decreased E-cadherin levels, effects that were reversed by MALAT1 siRNA or EZH2 siRNA. The results indicate that miR-217 regulation of EZH2/H3K27me3 via MALAT1 is involved in CSE-induced EMT and malignant transformation of HBE cells. The posttranscriptional silencing of MALAT1 by miR-217 provides a link, through EZH2, between ncRNAs and the EMT and establishes a mechanism for CSE-induced lung carcinogenesis.
Collapse
Affiliation(s)
- Lu Lu
- Institute of Toxicology, School of Public Health, Nanjing Medical University, Nanjing 211166, Jiangsu, People's Republic of China; The Key Laboratory of Modern Toxicology, Ministry of Education, School of Public Health, Nanjing Medical University, Nanjing 211166, Jiangsu, People's Republic of China
| | - Fei Luo
- Institute of Toxicology, School of Public Health, Nanjing Medical University, Nanjing 211166, Jiangsu, People's Republic of China; The Key Laboratory of Modern Toxicology, Ministry of Education, School of Public Health, Nanjing Medical University, Nanjing 211166, Jiangsu, People's Republic of China
| | - Yi Liu
- Institute of Toxicology, School of Public Health, Nanjing Medical University, Nanjing 211166, Jiangsu, People's Republic of China; The Key Laboratory of Modern Toxicology, Ministry of Education, School of Public Health, Nanjing Medical University, Nanjing 211166, Jiangsu, People's Republic of China
| | - Xinlu Liu
- Institute of Toxicology, School of Public Health, Nanjing Medical University, Nanjing 211166, Jiangsu, People's Republic of China; The Key Laboratory of Modern Toxicology, Ministry of Education, School of Public Health, Nanjing Medical University, Nanjing 211166, Jiangsu, People's Republic of China
| | - Le Shi
- Institute of Toxicology, School of Public Health, Nanjing Medical University, Nanjing 211166, Jiangsu, People's Republic of China; The Key Laboratory of Modern Toxicology, Ministry of Education, School of Public Health, Nanjing Medical University, Nanjing 211166, Jiangsu, People's Republic of China
| | - Xiaolin Lu
- Institute of Toxicology, School of Public Health, Nanjing Medical University, Nanjing 211166, Jiangsu, People's Republic of China; The Key Laboratory of Modern Toxicology, Ministry of Education, School of Public Health, Nanjing Medical University, Nanjing 211166, Jiangsu, People's Republic of China
| | - Qizhan Liu
- Institute of Toxicology, School of Public Health, Nanjing Medical University, Nanjing 211166, Jiangsu, People's Republic of China; The Key Laboratory of Modern Toxicology, Ministry of Education, School of Public Health, Nanjing Medical University, Nanjing 211166, Jiangsu, People's Republic of China.
| |
Collapse
|