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Zhong M, Qiu X, Liu Y, Yang Y, Gu L, Wang C, Chen H, Liu Z, Miao J, Zhuang G. TIPE Regulates DcR3 Expression and Function by Activating the PI3K/AKT Signaling Pathway in CRC. Front Oncol 2021; 10:623048. [PMID: 33718119 PMCID: PMC7943851 DOI: 10.3389/fonc.2020.623048] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2020] [Accepted: 12/23/2020] [Indexed: 11/13/2022] Open
Abstract
Tumor necrosis factor-induced protein-8 (TIPE) is highly expressed in colorectal cancer (CRC). Decoy receptor 3 (DcR3) is a soluble secreted protein that can antagonize Fas ligand (FasL)-induced apoptosis and promote tumorigenesis. It remains unclear whether TIPE can regulate DcR3 expression. In this study, we examined this question by analyzing the relationship between these factors in CRC. Bioinformatics and tissue microarrays were used to determine the expression of TIPE and DcR3 and their correlation in CRC. The expression of TIPE and DcR3 in colon cancer cells was detected. Plasma samples were collected from CRC patients, and DcR3 secretion was measured. Then, dual-luciferase reporter gene analysis was performed to assess the interaction between TIPE and DcR3. We exogenously altered TIPE expression and analyzed its function and influence on DcR3 secretion. Lipopolysaccharide (LPS) was used to stimulate TIPE-overexpressing HCT116 cells, and alterations in signaling pathways were detected. Additionally, inhibitors were used to confirm molecular mechanisms. We found that TIPE and DcR3 were highly expressed in CRC patients and that their expression levels were positively correlated. DcR3 was highly expressed in the plasma of cancer patients. We confirmed that TIPE and DcR3 were highly expressed in HCT116 cells. TIPE overexpression enhanced the transcriptional activity of the DcR3 promoter. TIPE activated the PI3K/AKT signaling pathway to regulate the expression of DcR3, thereby promoting cell proliferation and migration and inhibiting apoptosis. In summary, TIPE and DcR3 are highly expressed in CRC, and both proteins are associated with poor prognosis. TIPE regulates DcR3 expression by activating the PI3K/AKT signaling pathway in CRC, thus promoting cell proliferation and migration and inhibiting apoptosis. These findings may have clinical significance and promise for applications in the treatment or prognostication of CRC.
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Affiliation(s)
- Mengya Zhong
- Cancer Research Center, School of Medicine, Xiamen University, Xiamen, China.,Department of Hematology, The First Affiliated Hospital of Xiamen University and Institute of Hematology, School of Medicine, Xiamen University, Xiamen, China
| | - Xingfeng Qiu
- Department of Gastrointestinal Surgery, Zhongshan Hospital, Xiamen University, Xiamen, China
| | - Yu Liu
- Department of Gastrointestinal Surgery, Zhongshan Hospital, Xiamen University, Xiamen, China.,General Surgery Center of Bazhong Central Hospital, Bazhong, China
| | - Yan Yang
- Cancer Research Center, School of Medicine, Xiamen University, Xiamen, China
| | - Lei Gu
- Department of Gastrointestinal Surgery, Shanghai Tenth People's Hospital Affiliated to Tongji University, Shanghai, China
| | - Chenxi Wang
- Cancer Research Center, School of Medicine, Xiamen University, Xiamen, China
| | - Huiyu Chen
- Cancer Research Center, School of Medicine, Xiamen University, Xiamen, China
| | - Zhongchen Liu
- Department of Gastrointestinal Surgery, Shanghai Tenth People's Hospital Affiliated to Tongji University, Shanghai, China
| | - Jiayin Miao
- Department of Neurology, Zhongshan Hospital, Xiamen University, Xiamen, China
| | - Guohong Zhuang
- Cancer Research Center, School of Medicine, Xiamen University, Xiamen, China.,Organ Transplantation Institute of Xiamen University, Fujian Provincial Key Laboratory of Organ and Tissue Regeneration, School of Medicine, Xiamen University, Xiamen, China
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2
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Bordoloi D, Banik K, Vikkurthi R, Thakur KK, Padmavathi G, Sailo BL, Girisa S, Chinnathambi A, Alahmadi TA, Alharbi SA, Buhrmann C, Shakibaei M, Kunnumakkara AB. Inflection of Akt/mTOR/STAT-3 cascade in TNF-α induced protein 8 mediated human lung carcinogenesis. Life Sci 2020; 262:118475. [PMID: 32976884 DOI: 10.1016/j.lfs.2020.118475] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2020] [Revised: 09/13/2020] [Accepted: 09/17/2020] [Indexed: 02/08/2023]
Abstract
Lung cancer is the leading cause of cancer-related death across the globe. Despite the marked advances in detection and therapeutic approaches, management of lung cancer patients remains a major challenge to oncologists which can be mainly attributed to late stage diagnosis, tumor recurrence and chemoresistance. Therefore, to overthrow these limitations, there arises a vital need to develop effective biomarkers for the successful management of this aggressive cancer type. Notably, TNF-alpha induced protein 8 (TIPE), a nuclear factor-kappa B (NF-κB)-inducible, oncogenic molecule and cytoplasmic protein which is involved in the regulation of T lymphocyte-mediated immunity and different processes in tumor cells such as proliferation, cell death and evasion of growth suppressors, might serve as one such biomarker which would facilitate effective management of lung cancer. Expression studies revealed this protein to be significantly upregulated in different lung cancer types, pathological conditions, stages and grades of lung tumor compared to normal human lung tissues. In addition, knockout of TIPE led to the reduced proliferation, survival, invasion and migration of lung cancer cells. Furthermore, TIPE was found to function through modulation of Akt/mTOR/STAT-3 signaling cascade. This is the first report which shows the involvement of TIPE in tobacco induced lung carcinogenesis. It positively regulated nicotine, NNK, NNN, and BaP induced proliferation, survival and migration of lung cancer cells possibly via Akt/STAT-3 signaling. Thus, this protein possesses important role in the pathogenesis of lung tumor and hence it can be targeted for developing newer therapeutic interventions for the clinico-management of lung cancer.
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Affiliation(s)
- Devivasha Bordoloi
- Cancer Biology Laboratory, DBT-AIST International Center for Translational and Environmental Research (DAICENTER), Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India.
| | - Kishore Banik
- Cancer Biology Laboratory, DBT-AIST International Center for Translational and Environmental Research (DAICENTER), Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India
| | - Rajesh Vikkurthi
- Cancer Biology Laboratory, DBT-AIST International Center for Translational and Environmental Research (DAICENTER), Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India
| | - Krishan Kumar Thakur
- Cancer Biology Laboratory, DBT-AIST International Center for Translational and Environmental Research (DAICENTER), Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India
| | - Ganesan Padmavathi
- Cancer Biology Laboratory, DBT-AIST International Center for Translational and Environmental Research (DAICENTER), Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India
| | - Bethsebie Lalduhsaki Sailo
- Cancer Biology Laboratory, DBT-AIST International Center for Translational and Environmental Research (DAICENTER), Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India
| | - Sosmitha Girisa
- Cancer Biology Laboratory, DBT-AIST International Center for Translational and Environmental Research (DAICENTER), Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India
| | - Arunachalam Chinnathambi
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
| | - Tahani Awad Alahmadi
- Department of Pediatrics, College of Medicine, King Saud University [Medical City], King Khalid University Hospital, PO Box-2925, Riyadh 11461, Saudi Arabia
| | - Sulaiman Ali Alharbi
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
| | - Constanze Buhrmann
- Department of Anatomy, Ludwig-Maximilians-University Munich, Munich, Germany
| | - Mehdi Shakibaei
- Department of Anatomy, Ludwig-Maximilians-University Munich, Munich, Germany
| | - Ajaikumar B Kunnumakkara
- Cancer Biology Laboratory, DBT-AIST International Center for Translational and Environmental Research (DAICENTER), Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India.
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3
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Ye T, Yang B, Wang C, Su C, Luo J, Yang X, Yu H, Yuan Z, Meng Z, Xia J. TIPE1 impairs stemness maintenance in colorectal cancer through directly targeting β-catenin. Carcinogenesis 2020; 41:25-35. [PMID: 31111874 DOI: 10.1093/carcin/bgz079] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2018] [Revised: 04/16/2019] [Accepted: 04/28/2019] [Indexed: 12/30/2022] Open
Abstract
TIPE1 (tumor necrosis factor-α-induced protein 8-like 1) contributes to cell death in diverse cancers. However, the expression and biological functions of TIPE1 in colon cancer remain unclear. In the present study, we report that TIPE1 was downregulated in colon cancer tissues and positively correlates with prognosis of colon cancer patients. TIPE1 overexpression significantly inhibits colon cancer cell growth both in vitro and in vivo through impairing stemness, accompanied with downregulation of the stemness-related markers, ALDH, CD133, CD44 and SOX-9. Mechanically, TIPE1 directly targets β-catenin and promotes β-catenin degradation in a protease-dependent manner, and Wnt/β-catenin signaling plays a crucial role during TIPE1-mediated stemness inhibition in colon cancer. These findings reveal that TIPE1 exerts anti-tumor effects in colon cancer and suggest that TIPE1 would be a therapeutic target for cancers.
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Affiliation(s)
- Tao Ye
- Minhang Branch, Zhongshan Hospital, Fudan University; Institute of Fudan-Minhang Academic Health System, Minhang Hospital, Fudan University, Shanghai, China
| | - Biwei Yang
- Liver Cancer Institute, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Chen Wang
- Minhang Branch, Zhongshan Hospital, Fudan University; Institute of Fudan-Minhang Academic Health System, Minhang Hospital, Fudan University, Shanghai, China
| | - Chang Su
- Minhang Branch, Zhongshan Hospital, Fudan University; Institute of Fudan-Minhang Academic Health System, Minhang Hospital, Fudan University, Shanghai, China
| | - Jing Luo
- Minhang Branch, Zhongshan Hospital, Fudan University; Institute of Fudan-Minhang Academic Health System, Minhang Hospital, Fudan University, Shanghai, China
| | - Xiaodi Yang
- Minhang Branch, Zhongshan Hospital, Fudan University; Institute of Fudan-Minhang Academic Health System, Minhang Hospital, Fudan University, Shanghai, China
| | - Hongmei Yu
- Minhang Branch, Zhongshan Hospital, Fudan University; Institute of Fudan-Minhang Academic Health System, Minhang Hospital, Fudan University, Shanghai, China
| | - Zhen Yuan
- Minhang Branch, Zhongshan Hospital, Fudan University; Institute of Fudan-Minhang Academic Health System, Minhang Hospital, Fudan University, Shanghai, China
| | - Zhefeng Meng
- Minhang Branch, Zhongshan Hospital, Fudan University; Institute of Fudan-Minhang Academic Health System, Minhang Hospital, Fudan University, Shanghai, China
| | - Jinglin Xia
- Minhang Branch, Zhongshan Hospital, Fudan University; Institute of Fudan-Minhang Academic Health System, Minhang Hospital, Fudan University, Shanghai, China.,Liver Cancer Institute, Zhongshan Hospital, Fudan University, Shanghai, China
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4
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Ji J, Zhang YY, Fan YC. TIPE2 as a potential therapeutic target in chronic viral hepatitis. Expert Opin Ther Targets 2019; 23:485-493. [PMID: 30995133 DOI: 10.1080/14728222.2019.1608948] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Jian Ji
- Department of Clinical Laboratory, Qilu Hospital, Shandong University, Jinan, China
| | - Yuan-Yuan Zhang
- Department of Neurology, Jinan Central Hospital affiliated to Shandong University, Jinan, China
| | - Yu-Chen Fan
- Department of Hepatology, Qilu Hospital of Shandong University, Jinan, China
- Department of Immunology, Shandong University School of Basic Medical Science, Jinan, China
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TIPE Family of Proteins and Its Implications in Different Chronic Diseases. Int J Mol Sci 2018; 19:ijms19102974. [PMID: 30274259 PMCID: PMC6213092 DOI: 10.3390/ijms19102974] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2018] [Revised: 09/19/2018] [Accepted: 09/22/2018] [Indexed: 12/14/2022] Open
Abstract
The tumor necrosis factor-α-induced protein 8-like (TIPE/TNFAIP8) family is a recently identified family of proteins that is strongly associated with the regulation of immunity and tumorigenesis. This family is comprised of four members, namely, tumor necrosis factor-α-induced protein 8 (TIPE/TNFAIP8), tumor necrosis factor-α-induced protein 8-like 1 (TIPE1/TNFAIP8L1), tumor necrosis factor-α-induced protein 8-like 2 (TIPE2/TNFAIP8L2), and tumor necrosis factor-α-induced protein 8-like 3 (TIPE3/TNFAIP8L3). Although the proteins of this family were initially described as regulators of tumorigenesis, inflammation, and cell death, they are also found to be involved in the regulation of autophagy and the transfer of lipid secondary messengers, besides contributing to immune function and homeostasis. Interestingly, despite the existence of a significant sequence homology among the four members of this family, they are involved in different biological activities and also exhibit remarkable variability of expression. Furthermore, this family of proteins is highly deregulated in different human cancers and various chronic diseases. This review summarizes the vivid role of the TIPE family of proteins and its association with various signaling cascades in diverse chronic diseases.
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Padmavathi G, Banik K, Monisha J, Bordoloi D, Shabnam B, Arfuso F, Sethi G, Fan L, Kunnumakkara AB. Novel tumor necrosis factor-α induced protein eight (TNFAIP8/TIPE) family: Functions and downstream targets involved in cancer progression. Cancer Lett 2018; 432:260-271. [DOI: 10.1016/j.canlet.2018.06.017] [Citation(s) in RCA: 72] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2018] [Revised: 06/11/2018] [Accepted: 06/12/2018] [Indexed: 12/21/2022]
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TNFAIP8 promotes the proliferation and cisplatin chemoresistance of non-small cell lung cancer through MDM2/p53 pathway. Cell Commun Signal 2018; 16:43. [PMID: 30064446 PMCID: PMC6069800 DOI: 10.1186/s12964-018-0254-x] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Accepted: 07/19/2018] [Indexed: 12/29/2022] Open
Abstract
Background The highly refractory nature of non-small cell lung cancer (NSCLC) to chemotherapeutic drugs is an important factor resulting in its poor prognosis. Recent studies have revealed that tumour necrosis factor alpha-induced protein 8 (TNFAIP8) is involved in various biological and pathological processes of cells, but their underlying mechanisms in processes ranging from cancer development to drug resistance have not been fully elucidated. Methods TNFAIP8 expression in clinical NSCLC samples was examined through immunohistochemistry (IHC). After adjusting for patients’ characteristics with propensity score matching, Kaplan-Meier analysis and Cox regression analysis were performed for comparison of patients’ survival according to the TNFAIP8 level. Lentiviral transfection with TNFAIP8-specific shRNAs was used to establish stable TNFAIP8 knockdown (TNFAIP8 KD) NCI-H460, A549 and cis-diamminedichloroplatinum II resistant A549 (A549/cDDP) cell lines. Cell proliferation and viability were assessed by CCK-8 assay. Cell cycle was examined by flow cytometry. Multiple pathways regulated by TNFAIP8 KD were revealed by microarray analysis. Results We found that high TNFAIP8 expression was associated with advanced pT stage, advanced pTNM stage, lymph node metastasis and unfavourable survival in NSCLC patients. TNFAIP8 shRNAs reduced in vitro cancer cell proliferation and in vivo tumor growth. Additionally, TNFAIP8 KD increased the sensitivity of NSCLC cells to cisplatin in vitro and in vivo. Conversely, up-regulation of TNFAIP8 promoted the proliferation and drug resistance to cisplatin of NSCLC cells. TNFAIP8 influences cancer progression pathways involving the MDM2/p53 pathway. Indeed, we observed that TNFAIP8 KD mediated the MDM2 downregulation and the p53 ubiquitination, thereby decreasing the degradation of p53 protein. shRNA p53 reversed TNFAIP8 shRNA-mediated regulation of cell proliferation, cell cycle, cisplatin sensitivity, and expression levels of RAD51, a DNA repair gene. Conclusion Our work uncovers a hitherto unappreciated role of TNFAIP8 in NSCLC proliferation and cisplatin chemoresistance that is mediated through the MDM2/p53 pathway. These findings might offer potential therapeutic targets for reversing cisplatin resistance in NSCLC patients with high TNFAIP8 expression. Electronic supplementary material The online version of this article (10.1186/s12964-018-0254-x) contains supplementary material, which is available to authorized users.
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8
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Zhang L, Liu R, Luan YY, Yao YM. Tumor Necrosis Factor-α Induced Protein 8: Pathophysiology, Clinical Significance, and Regulatory Mechanism. Int J Biol Sci 2018; 14:398-405. [PMID: 29725261 PMCID: PMC5930472 DOI: 10.7150/ijbs.23268] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Accepted: 02/26/2018] [Indexed: 12/13/2022] Open
Abstract
Tumor necrosis factor-α-induced protein-8 (TNFAIP8) is the earliest discovered component of TNFAIP8 family [tumor necrosis factor-α-induced protein-8 like (TIPE) family]. TNFAIP8 contains a putative death effector domain (DED) homologous to DED II in FLIP (Fas-associated death domain-like interleukin-1β-converting enzyme-inhibitory protein), which may affect cell survival/death process. Recently, it has been demonstrated that TNFAIP8 could inhibit apoptosis and autophagy in various types of cells. Moreover, TNFAIP8 level fluctuated evidently in patients with inflammatory, malignant, and autoimmune diseases, indicating that it might be an anti-apoptotic and oncogenetic protein. Herein we will review the discovery, gene/protein structure, pathophysiological functions, and clinical significance of TNFAIP8 together with its potential regulatory mechanism.
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Affiliation(s)
- Lei Zhang
- Trauma Research Center, First Hospital Affiliated to the Chinese PLA General Hospital, Beijing 100048, People's Republic of China.,Emergency Department, The General Hospital of the Chinese PLA Rocket Force, Beijing 100088, People's Republic of China
| | - Ran Liu
- Department of Endocrinology, 307th Hospital of the Chinese PLA, Beijing 100071, People's Republic of China
| | - Ying-Yi Luan
- Trauma Research Center, First Hospital Affiliated to the Chinese PLA General Hospital, Beijing 100048, People's Republic of China
| | - Yong-Ming Yao
- Trauma Research Center, First Hospital Affiliated to the Chinese PLA General Hospital, Beijing 100048, People's Republic of China
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9
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Sullivan C, Lage CR, Yoder JA, Postlethwait JH, Kim CH. Evolutionary divergence of the vertebrate TNFAIP8 gene family: Applying the spotted gar orthology bridge to understand ohnolog loss in teleosts. PLoS One 2017; 12:e0179517. [PMID: 28658311 PMCID: PMC5489176 DOI: 10.1371/journal.pone.0179517] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Accepted: 05/30/2017] [Indexed: 02/06/2023] Open
Abstract
Comparative functional genomic studies require the proper identification of gene orthologs to properly exploit animal biomedical research models. To identify gene orthologs, comprehensive, conserved gene synteny analyses are necessary to unwind gene histories that are convoluted by two rounds of early vertebrate genome duplication, and in the case of the teleosts, a third round, the teleost genome duplication (TGD). Recently, the genome of the spotted gar, a holostean outgroup to the teleosts that did not undergo this third genome duplication, was sequenced and applied as an orthology bridge to facilitate the identification of teleost orthologs to human genes and to enhance the power of teleosts as biomedical models. In this study, we apply the spotted gar orthology bridge to help describe the gene history of the vertebrate TNFAIP8 family. Members of the TNFAIP8 gene family have been linked to regulation of immune function and homeostasis and the development of multiple cancer types. Through a conserved gene synteny analysis, we identified zebrafish orthologs to human TNFAIP8L1 and TNFAIP8L3 genes and two co-orthologs to human TNFAIP8L2, but failed to identify an ortholog to human TNFAIP8. Through the application of the orthology bridge, we determined that teleost orthologs to human TNFAIP8 genes were likely lost in a genome inversion event after their divergence from their common ancestor with spotted gar. These findings demonstrate the value of this enhanced approach to gene history analysis and support the development of teleost models to study complex questions related to an array of biomedical issues, including immunity and cancer.
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Affiliation(s)
- Con Sullivan
- Department of Molecular and Biomedical Sciences, University of Maine, Orono, Maine, United States of America
- Graduate School of Biomedical Sciences and Engineering, University of Maine, Orono, Maine, United States of America
- * E-mail: (CS); (CHK)
| | - Christopher R. Lage
- Program in Biology, University of Maine - Augusta, Augusta, Maine, United States of America
| | - Jeffrey A. Yoder
- Department of Molecular Biomedical Sciences, North Carolina State University, Raleigh, North Carolina, United States of America
| | - John H. Postlethwait
- Institute of Neuroscience, University of Oregon, Eugene, Oregon, United States of America
| | - Carol H. Kim
- Department of Molecular and Biomedical Sciences, University of Maine, Orono, Maine, United States of America
- Graduate School of Biomedical Sciences and Engineering, University of Maine, Orono, Maine, United States of America
- * E-mail: (CS); (CHK)
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Gao HY, Huo FC, Wang HY, Pei DS. MicroRNA-9 inhibits the gastric cancer cell proliferation by targeting TNFAIP8. Cell Prolif 2017; 50. [PMID: 28127811 DOI: 10.1111/cpr.12331] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Accepted: 12/16/2016] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND AND OBJECTIVES MicroRNA-9 is frequently dysregulated in many human carcinoma types, including gastric cancer (GC). Previous studies demonstrated that the expression of TNFAIP8 in GC is correlated with tumour occurrence, development, invasion, metastasis and prognosis. However, till now, the relationship between MicroRNA-9 and TNFAIP8 in GC has not been reported. MATERIALS AND METHODS Levels of miR-9 and TNFAIP8 expression in GC tissues and in human GC cell lines were studied using qualitative real-time PCR (qRT-PCR) and Western blotting. Cell viability was detected using the CCK-8 and clone formation assays. A dual-luciferase reporter system was used to confirm the target gene of miR-9. RESULTS We found that the expression level of MicroRNA-9 in GC tissues and cell lines was significantly lower than that in adjacent non-cancerous tissues and human immortalized gastric epithelial cell (GES) line, respectively. In addition, overexpression of MicroRNA-9 markedly inhibited GC cell proliferation in vitro and tumour growth in vivo. Further experiments revealed that TNFAIP8 was a direct and functional target of MicroRNA-9 in GC and overexpression of MicroRNA-9 obviously down-regulated the expression of TNFAIP8, which was involved in the gastric carcinogenesis and cancer progression. CONCLUSION Our results suggested that MicroRNA-9-TNFAIP8 might represent a promising diagnostic biomarker for GC patients and could be a potential therapeutic target in the prevention and treatment of GC.
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Affiliation(s)
- Hong-Yu Gao
- Jiangsu Key Laboratory of Biological Cancer Therapy, Xuzhou Medical University, Xuzhou, China
| | - Fu-Chun Huo
- Jiangsu Key Laboratory of Biological Cancer Therapy, Xuzhou Medical University, Xuzhou, China
| | - Hai-Yan Wang
- Jiangsu Key Laboratory of Biological Cancer Therapy, Xuzhou Medical University, Xuzhou, China.,Center of Clinical Oncology, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, China
| | - Dong-Sheng Pei
- Jiangsu Key Laboratory of Biological Cancer Therapy, Xuzhou Medical University, Xuzhou, China.,Department of Pathology, Xuzhou Medical University, Xuzhou, China
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