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Maksimova VP, Usalka OG, Makus YV, Popova VG, Trapeznikova ES, Khayrieva GI, Sagitova GR, Zhidkova EM, Prus AY, Yakubovskaya MG, Kirsanov KI. Aberrations of DNA methylation in cancer. ADVANCES IN MOLECULAR ONCOLOGY 2022. [DOI: 10.17650/2313-805x-2022-9-4-24-40] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
DNA methylation is a chromatin modification that plays an important role in the epigenetic regulation of gene expression. Changes in DNA methylation patterns are characteristic of many malignant neoplasms. DNA methylation is occurred by DNA methyltransferases (DNMTs), while demethylation is mediated by TET family proteins. Mutations and changes in the expression profile of these enzymes lead to DNA hypo- and hypermethylation and have a strong impact on carcinogenesis. In this review, we considered the key aspects of the mechanisms of regulation of DNA methylation and demethylation, and also analyzed the role of DNA methyltransferases and TET family proteins in the pathogenesis of various malignant neoplasms.During the preparation of the review, we used the following biomedical literature information bases: Scopus (504), PubMed (553), Web of Science (1568), eLibrary (190). To obtain full-text documents, the electronic resources of PubMed Central (PMC), Science Direct, Research Gate, CyberLeninka were used. To analyze the mutational profile of epigenetic regulatory enzymes, we used the cBioportal portal (https://www.cbioportal.org / ), data from The AACR Project GENIE Consortium (https://www.mycancergenome.org / ), COSMIC, Clinvar, and The Cancer Genome Atlas (TCGA).
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Affiliation(s)
- V. P. Maksimova
- N.N. Blokhin National Medical Research Center of Oncology, Ministry of Health of Russia
| | - O. G. Usalka
- N.N. Blokhin National Medical Research Center of Oncology, Ministry of Health of Russia; Sechenov First Moscow State Medical University, Ministry of Health of Russia
| | - Yu. V. Makus
- N.N. Blokhin National Medical Research Center of Oncology, Ministry of Health of Russia; Peoples’ Friendship University of Russia
| | - V. G. Popova
- N.N. Blokhin National Medical Research Center of Oncology, Ministry of Health of Russia; Mendeleev University of Chemical Technology of Russia
| | - E. S. Trapeznikova
- Sechenov First Moscow State Medical University, Ministry of Health of Russia
| | - G. I. Khayrieva
- Sechenov First Moscow State Medical University, Ministry of Health of Russia
| | - G. R. Sagitova
- Sechenov First Moscow State Medical University, Ministry of Health of Russia
| | - E. M. Zhidkova
- N.N. Blokhin National Medical Research Center of Oncology, Ministry of Health of Russia
| | - A. Yu. Prus
- N.N. Blokhin National Medical Research Center of Oncology, Ministry of Health of Russia; MIREA – Russian Technological University
| | - M. G. Yakubovskaya
- N.N. Blokhin National Medical Research Center of Oncology, Ministry of Health of Russia
| | - K. I. Kirsanov
- N.N. Blokhin National Medical Research Center of Oncology, Ministry of Health of Russia; Peoples’ Friendship University of Russia
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Circular RNA circPGD contributes to gastric cancer progression via the sponging miR-16-5p/ABL2 axis and encodes a novel PGD-219aa protein. Cell Death Dis 2022; 8:384. [PMID: 36104322 PMCID: PMC9472197 DOI: 10.1038/s41420-022-01177-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Revised: 08/31/2022] [Accepted: 09/01/2022] [Indexed: 11/26/2022]
Abstract
CircRNAs have critical effects on tumor development and progression. However, circPGD effect on gastric cancer (GC) is still elusive. Nuclear and cytoplasmic RNA fractionation, and RNA-FISH assay examined the localization of circPGD in MGC-803 cells. qRT-PCR was conducted to detect the expression and prognostic significance of circPGD, miR-16-5p, and ABL2 within GC tissues. Meanwhile, qRT-PCR, luciferase reporter assays, rescue, and western blotting assays confirmed the interactions between circPGD, miR-16-5p, and ABL2. Transwell, wound healing, and colony-formation assays, as well as CCK-8 and cell apoptosis assays, analyzed the functions of circPGD, miR-16-5p, ABL2, as well as PGD-219aa within GC cells. Western blotting and cell immunofluorescence experiments detected the differences in the expression of the related proteins. Finally, xenograft and metastatic mouse models were used to investigate circPGD function in vivo. Mass spectrometry was used to detect the existence of PGD-219aa in MGC-803 cells. CircPGD was localized in the cytoplasm and nucleus of MGC-803 cells. Compared with the control, circPGD and ABL2 expression increased within GC tissues and cells, and the miR-16-5p level was decreased. Functionally, circPGD promoted cell proliferation, migration and suppressed apoptosis in vitro. Mechanistically, circPGD sponged miR-16-5p for relieving miR-16-5p suppression on the corresponding target ABL2 via the SMAD2/3 and YAP signaling pathways. In addition, circPGD encodes a novel PGD-219aa protein that can enhance the growth and migration of GC cells, while inhibiting GC cells apoptosis via the SMAD2/3 and YAP signaling pathways. Furthermore, circPGD overexpression enhanced tumor aggressiveness, while circPGD knockdown inhibited tumor growth. Overall, circPGD has a novel oncogenic effect on GC cells, indicating the potential of circPGD as the tumorigenic factor and a promising diagnostic marker for GC.
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Effects of Medium Supplements on Somatic Embryo Maturation and DNA Methylation in Pseudotsuga gaussenii Flous, a Species under Protection. FORESTS 2022. [DOI: 10.3390/f13020288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Pseudotsuga gaussenii is a forest species under protection in China. Propagation via somatic embryogenesis is efficient and needed for recovering this species. In this research, effects of medium supplements, i.e., methylglyoxal-bis (guanylhydrazone) (MGBG), polyethylene glycol (PEG), and maltose, on somatic embryo (SE) development were studied. More mature SEs developed with the pre-maturation treatment medium supplemented with 50 μM or 100 μM MGBG. During SE maturation, when the medium was supplemented with both PEG and maltose, the over-proliferation of embryogenic tissue was suppressed. When maltose was eliminated from the maturation medium, SEs were slightly smaller but developed better than other treatments due to the supply of lower carbon source, whereas when PEG was taken out from the maturation medium, no mature SE was obtained, only the heavily-proliferated plant tissue. Meanwhile, DNA methylation levels differed in these SE maturation cultures at the late culture stage of SE maturation. The level increased sharply with no maltose treatment (20.28%) while decreasing without PEG supplement (10.35%). DNA methyltransferase genes MET1-1, MET1-2, MET1-3, CMT3, DRM1, and DRM2 were partially cloned in this study to detect their expression level via qPCR. Expression of these genes, except MET1-3, in the culture of no PEG was higher significantly than the cultures of other treatments at weeks 1, 3, and 10. Our results suggested that MGBG and/or PEG play an important role in stimulating SE development and maturation. Furthermore, sugar supplements at a lower level benefited SE maturation in Pseudotsuga gaussenii.
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Zhang J, Zhang F, Zhang F, Wu H, Zhang B, Wu X. Correlation between promoter methylation of the LDH‑C4 gene and DNMT expression in breast cancer and their prognostic significance. Oncol Lett 2021; 23:35. [PMID: 34966451 DOI: 10.3892/ol.2021.13153] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Accepted: 10/22/2021] [Indexed: 11/06/2022] Open
Affiliation(s)
- Jiandong Zhang
- Clinical Laboratory, The Third Hospital of Hebei Medical University, Shijiazhuang, Hebei 050011, P.R. China
| | - Fengxia Zhang
- Nursing Department, Hengshui Health School, Hengshui, Hebei 050000, P.R. China
| | - Fengqin Zhang
- Pathology Department, Hengshui People's Hospital of Hebei Medical University, Hengshui, Hebei 050000, P.R. China
| | - Hua Wu
- Clinical Laboratory, The Third Hospital of Hebei Medical University, Shijiazhuang, Hebei 050011, P.R. China
| | - Bei Zhang
- Clinical Laboratory, The Third Hospital of Hebei Medical University, Shijiazhuang, Hebei 050011, P.R. China
| | - Xiangyun Wu
- Clinical Laboratory, The Third Hospital of Hebei Medical University, Shijiazhuang, Hebei 050011, P.R. China
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Hwang I, Tang D, Paik J. Oxidative stress sensing and response in neural stem cell fate. Free Radic Biol Med 2021; 169:74-83. [PMID: 33862161 PMCID: PMC9594080 DOI: 10.1016/j.freeradbiomed.2021.03.043] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 03/13/2021] [Accepted: 03/25/2021] [Indexed: 12/22/2022]
Abstract
Neural stem/progenitor cells (NSPCs) contribute to the physiological cellular turnover of the adult brain and make up its regenerative potential. It is thus essential to understand how different factors influence their proliferation and differentiation to gain better insight into potential therapeutic targets in neurodegenerative diseases and traumatic brain injuries. Recent evidences indicate the roles of redox stress sensing and coping mechanisms in mediating the balance between NSPC self-renewal and differentiation. Such mechanisms involve direct cysteine modification, signaling and metabolic reprogramming, epigenetic alterations and transcription changes leading to adaptive responses like autophagy. Here, we discuss emerging findings on the involvement of redox sensors and effectors and their mechanisms in influencing changes in cellular redox potential and NSPC fate.
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Affiliation(s)
- Inah Hwang
- R&D Center, OneCureGEN Co., Ltd, Daejeon, 34141, Republic of Korea; Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, 10021, USA
| | - Deanna Tang
- University of Chicago, Chicago, IL, 60637, USA
| | - Jihye Paik
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, 10021, USA.
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Purkait S, Patra S, Mitra S, Behera MM, Panigrahi MK, Kumar P, Kar M, Hallur V, Chandra Samal S. Elevated Expression of DNA Methyltransferases and Enhancer of Zeste Homolog 2 in Helicobacter pylori - Gastritis and Gastric Carcinoma. Dig Dis 2021; 40:156-167. [PMID: 33895728 DOI: 10.1159/000516478] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/31/2020] [Accepted: 04/08/2021] [Indexed: 02/02/2023]
Abstract
AIM The aim of this study was to study the role of key epigenetic regulators pertaining to DNA methylation and histone-modification systems in Helicobacter pylori (HP)-associated gastritis and gastric carcinogenesis. METHODS The expression of DNA methyltransferase (DNMT-1, 3A, and 3B) and the catalytic subunit of polycomb repressive complex-2 (enhancer of zeste homolog 2 [EZH2]) in gastric carcinomas (n = 104), mucosa adjacent to carcinoma (n = 104), HP-associated gastritis (n = 95), and histologically normal mucosa (n = 31) was assessed by immunohistochemistry and qRT-PCR. RESULTS The expression of all 3 DNMTs and EZH2 was significantly higher in HP-associated gastritis and carcinoma cases than in those with adjacent and normal mucosa. The expression of DNMT-1 and 3B was maximum in HP-associated gastritis. DNMT-3A showed higher expression in carcinoma-adjacent mucosa than in normal mucosa. Interestingly, the expression of EZH2 was higher in cases of HP-associated gastritis with metaplasia than in those without metaplasia and also in cases of intestinal type of adenocarcinoma. Significant positive correlation of EZH2 was identified with DNMT-1, DNMT-3A, and DNMT-3B. However, none of these markers was associated with survival outcome. CONCLUSION This study establishes an important role of the key epigenetic regulators in the pathogenesis of both HP-associated gastritis and gastric carcinoma. Higher expression of all the epigenetic markers in the gastritis and their persistence in the carcinoma point toward their implications in HP-driven gastric carcinogenesis. Further, an inter-relation between the 2 arms of epigenetics, namely, DNA methylation and histone-modification in the pathogenesis of gastric carcinoma, is also documented. Given the reversibility of epigenetic phenomenon, these molecules may be of important therapeutic use.
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Affiliation(s)
- Suvendu Purkait
- Department of Pathology and Lab Medicine, All India Institute of Medical Sciences, Bhubaneswar, India
| | - Susama Patra
- Department of Pathology and Lab Medicine, All India Institute of Medical Sciences, Bhubaneswar, India
| | - Suvradeep Mitra
- Department of Pathology and Lab Medicine, All India Institute of Medical Sciences, Bhubaneswar, India
| | - Minakshi M Behera
- Department of Pathology and Lab Medicine, All India Institute of Medical Sciences, Bhubaneswar, India
| | - Manas Kumar Panigrahi
- Department of Gastroenterology, All India Institute of Medical Sciences, Bhubaneswar, India
| | - Pankaj Kumar
- Department of General Surgery, All India Institute of Medical Sciences, Bhubaneswar, India
| | - Madhabananda Kar
- Department of Surgical Oncology, All India Institute of Medical Sciences, Bhubaneswar, India
| | - Vinaykumar Hallur
- Department of Microbiology, All India Institute of Medical Sciences, Bhubaneswar, India
| | - Subash Chandra Samal
- Department of Gastroenterology, All India Institute of Medical Sciences, Bhubaneswar, India
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microRNA-29a inhibits cardiac fibrosis in Sprague-Dawley rats by downregulating the expression of DNMT3A. Anatol J Cardiol 2019; 20:198-205. [PMID: 30297596 PMCID: PMC6249525 DOI: 10.14744/anatoljcardiol.2018.98511] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Objective: This study aims to investigate the effect of miR-29a targeting the regulation of DNMT3A on the development of cardiac fibrosis in Sprague-Dawley (SD) rats. Methods: In vivo experiment: SD rats were randomly divided into model and control groups. The cardiac and left ventricular indices in each group were calculated. The pathological changes of the myocardium were observed. The expression levels of miR-29a, CollA1, α-SMA, and DNMT3A in the myocardium of each group were detected. In vitro experiment: The cardiac fibroblasts (CFs) of SD rats were isolated from the myocardial tissue of SD rats and cultured. The miR-29a mimics, inhibitors, DNMT3A-siRNA, and control-siRNA were transfected into CFs. The expression levels of miR-29a, DNMT3A, CollA1, and α-SMA were detected, and the proliferation of CFs after transfection was observed. Results: The heart weight index of the rats in the model group increased significantly compared with that in the control group. Obvious collagen deposition was observed in the myocardial tissue of the model group. The expression levels of CollA1, α-SMA, and DNMT3A in the model group were significantly higher than those in the control group (p<0.05). Conclusion: miR-29a reduced the activation and proliferation of CFs to improve cardiac fibrosis probably by the downregulation of DNMT3A.
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Hua CD, Bian EB, Chen EF, Yang ZH, Tang F, Wang HL, Zhao B. Repression of Dok7 expression mediated by DNMT1 promotes glioma cells proliferation. Biomed Pharmacother 2018; 106:678-685. [PMID: 29990858 DOI: 10.1016/j.biopha.2018.06.156] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Revised: 06/27/2018] [Accepted: 06/27/2018] [Indexed: 11/25/2022] Open
Abstract
Malignant glioma is one of the most common primary human tumors in the central nervous system. The molecular mechanisms of the progression and development of glioma have been largely unexplored. In this study, we illustrated that the expression of Dok7 was downregulation in human glioma tissues. Dok7 overexpression significantly inhibits proliferation and colony formation in vitro, and the xenograft tumor formation in vivo. In addition, 5-Aza-2'-deoxycytidine (5-Aza), a DNA methylation inhibitor, preventing the loss of Dok7 expression by decreasing aberrant hypermethylation of Dok7 promoter in glioma cells. More importantly, DNMT1 knockdown induced the demethylation of Dok7 promoter, and enhanced the expression of Dok7 in gliomas. These results suggest that epigenetic silencing of Dok7 may provide a novel glioma treatment strategy.
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Affiliation(s)
- Cheng-Dao Hua
- Department of Neurosurgery, The Second Affiliated Hospital of Anhui Medical University, Hefei, 230601, China; Cerebral Vascular Disease Research Center, Anhui Medical University, Hefei, 230601, China
| | - Er-Bao Bian
- Department of Neurosurgery, The Second Affiliated Hospital of Anhui Medical University, Hefei, 230601, China; Cerebral Vascular Disease Research Center, Anhui Medical University, Hefei, 230601, China
| | - Er-Feng Chen
- Department of Neurosurgery, The Second Affiliated Hospital of Anhui Medical University, Hefei, 230601, China; Cerebral Vascular Disease Research Center, Anhui Medical University, Hefei, 230601, China
| | - Zhi-Hao Yang
- Department of Neurosurgery, The Second Affiliated Hospital of Anhui Medical University, Hefei, 230601, China; Cerebral Vascular Disease Research Center, Anhui Medical University, Hefei, 230601, China
| | - Feng Tang
- Department of Neurosurgery, The Second Affiliated Hospital of Anhui Medical University, Hefei, 230601, China; Cerebral Vascular Disease Research Center, Anhui Medical University, Hefei, 230601, China
| | - Hong-Liang Wang
- Department of Neurosurgery, The Second Affiliated Hospital of Anhui Medical University, Hefei, 230601, China; Cerebral Vascular Disease Research Center, Anhui Medical University, Hefei, 230601, China
| | - Bing Zhao
- Department of Neurosurgery, The Second Affiliated Hospital of Anhui Medical University, Hefei, 230601, China; Cerebral Vascular Disease Research Center, Anhui Medical University, Hefei, 230601, China.
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Ahmadi K, Soleimani A, Irani S, Kiani A, Ghanadi K, Noormohamadi Z, Sakinejad F. DNMT3B -579 G>T Promoter Polymorphism and the Risk of Gastric Cancer in the West of Iran. J Gastrointest Cancer 2018; 49:167-171. [PMID: 28220295 DOI: 10.1007/s12029-017-9928-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
BACKGROUND Many studies have suggested that modulation of DNMT3B function caused by single nucleotide polymorphisms of the DNMT3B promoter region may underlie the susceptibility to various cancers such as tumors of the digestive system. The aim of this study was to investigate the effect of -579 G>T polymorphism in the promoter of the DNMT3B gene on risk of gastric cancer in a population from West Iran. PATIENTS AND METHODS We conducted a case-control study in 100 gastric cancer patients and 112 cancer-free controls to assess the correlation between DNMT3B -579 G>T (rs1569686) polymorphism and the risk of gastric cancer. Detection of genotypes of DNMT3B G39179T polymorphism was analyzed by PCR-RFLP. RESULTS There was no significant difference in the distribution of DNMT3B -579 G>T genotypes between the cases and controls. However, in the stratified analysis by clinicopathological characteristic types, we found that statistically, the risk susceptibility to gastric cancer was significantly associated with tumor grade II and GT/TT genotype of patients, compared to patients having GG genotype, (OR = 5.4737, 95% CI = 1.4746. 20.3184, P = 0.01). CONCLUSIONS Our study suggested that the -579 T allele may increase the relative risk for the progression of clinicopathological characteristic of tumor grade of gastric cancer patients.
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Affiliation(s)
- Kulsom Ahmadi
- Lorestan University of Medical Sciences, Khorramabad, Iran
| | - Azam Soleimani
- Razi Herbal Medicines Research Center, Lorestan University of Medical Sciences, Khorramabad, Iran.
| | - Shiva Irani
- Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | | | - Kourosh Ghanadi
- Razi Herbal Medicines Research Center and Department of Internal Medicine, Lorestan University of Medical Sciences, Khorramabad, Iran
| | - Zahra Noormohamadi
- Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran
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Yang L, Luo P, Song Q, Fei X. DNMT1/miR-200a/GOLM1 signaling pathway regulates lung adenocarcinoma cells proliferation. Biomed Pharmacother 2018; 99:839-847. [PMID: 29710483 DOI: 10.1016/j.biopha.2018.01.161] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2017] [Revised: 01/22/2018] [Accepted: 01/29/2018] [Indexed: 02/07/2023] Open
Abstract
OBJECTIVES Lung adenocarcinoma (LAD) comprises about 80% of all diagnosed lung cancers. However, the underlying regulatory mechanism of LAD cell proliferation is largely unclear. The emergence of microRNAs and molecular-targeted therapies adds a new dimension in our efforts to combat this deadly disease. METHOD In this work, the A549 and H1650 human lung cancer cell lines were used in this study. The proliferation was evaluated by the MTT and BrdU assay. The expression level of related proteins was detected by western blot. RESULT We reported GOLM1 was highly expressed in LAD cells and associated with low survival ratio and higher grade malignancy. Knockdown of GOLM1 repressed the LAD cell proliferation. Overexpression of GOLM1 promoted the cell proliferation. Further we found that the level of microRNA-200a (miR-200a) expression was low in LAD cells. miR-200a repress GOLM1 expression by directly targeting its 3? UTR. Overexpression of miR-200a repressed the cell proliferation and blocked the increase of LAD cell proliferation caused by GOLM1 overexpression. Further, we found that miR-200 was downregulated by DNMT1.Overexpression of DNMT1 blocked the function of miR-200a on repressing proliferation. We then found that knockdown of DNMT1 repressed LAD cell proliferation, which could be rescued by GOLM1 overexpression. CONCLUSION This work revealed the critical function of GOLM1/miR-200a/DNMT1 signaling pathway on regulating LAD cell proliferation, and might lay the foundation for further clinical treatment of LAD.
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Affiliation(s)
- Longqiu Yang
- Department of Anesthesiology, Huangshi Central Hospital, Affiliated Hospital of Hubei Polytechnic University, Edong Healthcare Group, Huangshi, 435000, China
| | - Pengcheng Luo
- Department of Urology Surgery, Huangshi Central Hospital, Affiliated Hospital of Hubei Polytechnic University, Edong Healthcare Group, Huangshi, 435000, China
| | - Qiong Song
- Department of Anesthesiology, Zhengzhou Central Hospital Affiliated to Zhengzhou University, 195 Tongbai Road, Zhengzhou, Henan, 450007, China.
| | - Xuejie Fei
- Department of Intensive Care Unit, Shuguang Hospital Affiliated With Shanghai University of Traditional Chinese Medicine, Shanghai, 200021, China.
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Shi H, Chen X, Jiang H, Wang X, Yu H, Sun P, Sui X. miR-148a suppresses cell invasion and migration in gastric cancer by targeting DNA methyltransferase 1. Oncol Lett 2018. [PMID: 29541249 PMCID: PMC5835867 DOI: 10.3892/ol.2018.7907] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Gastric cancer (GC) is the fourth most common malignant tumor globally. The highest incidence of GC is found in Eastern Asia, particularly in China. It is therefore imperative to further elucidate the molecular pathogenesis of GC in order to identify new biomarkers and targets for effective therapy. In the present study, we determined whether miR-148a was aberrantly downregulated in gastric cancer tissues and significantly correlated with aggressive clinicopathological characteristics in the MGC-803, HGC-27 and GES-1 cell lines using reverse transcription-quantitative PCR and western blot analysis. The cell lines were obtained from 60 patients who presented at our hospital between September 2010 and July 2015. The results showed that, miR-148a was aberrantly downregulated in GC tissues and its expression was relatively lower in the MGC-803 and HGC-27 GC cell lines than in the normal gastric epithelial cell line, GES-1. The clinicopathological analysis revealed that a decrease of miR-148a was significantly correlated with lymph-node metastasis (P<0.01) and tumor node metastasis (TNM) stage (P<0.05). The transwell assay showed that the re-expression of miR-148a significantly reduced cell migratory and invasive abilities in vitro (P<0.01). The luciferase assay confirmed that, DNA methyltransferase 1 (DNMT1) was a direct and functional target of miR-148a. The miR-148a inhibitor increased the expression of DNMT1 in HGC-27 cells and the re-expression of miR-148a reduced the expression of DNMT1 in MGC-803 cells as confirmed by western blot analysis. Furthermore, we found that the re-expression of DNMT1 reversed the inhibition of cell migration and invasion induced by miR-148a. Taken together, we demonstrated that miR-148a suppresses cell invasion and migration in gastric cancer by regulating DNMT1 expression. The miR-148a/DNMT1 axis may therefore be a new potential target for GC therapy.
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Affiliation(s)
- Huaijie Shi
- Department of Gastrointestinal Surgery, Weihai Central Hospital, Weihai, Shandong 264400, P.R. China
| | - Xiaojing Chen
- First Department of Radiotherapy, Qingdao Center Hospital, Qingdao, Shandong 266000, P.R. China
| | - Hao Jiang
- Department of Gastrointestinal Surgery, Weihai Central Hospital, Weihai, Shandong 264400, P.R. China
| | - Xujie Wang
- Department of Gastrointestinal Surgery, Weihai Central Hospital, Weihai, Shandong 264400, P.R. China
| | - Hao Yu
- Department of Gastrointestinal Surgery, Weihai Central Hospital, Weihai, Shandong 264400, P.R. China
| | - Pijiang Sun
- Department of Gastrointestinal Surgery, Weihai Central Hospital, Weihai, Shandong 264400, P.R. China
| | - Xin Sui
- Department of Gastrointestinal Surgery, Weihai Central Hospital, Weihai, Shandong 264400, P.R. China
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Herrera-Goepfert R, Oñate-Ocaña LF, Mosqueda-Vargas JL, Herrera LA, Castro C, Mendoza J, González-Barrios R. Methylation of DAPK and THBS1 genes in esophageal gastric-type columnar metaplasia. World J Gastroenterol 2016; 22:4567-4575. [PMID: 27182166 PMCID: PMC4858638 DOI: 10.3748/wjg.v22.i18.4567] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Revised: 01/19/2016] [Accepted: 01/30/2016] [Indexed: 02/06/2023] Open
Abstract
AIM: To explore methylation of DAPK, THBS1, CDH-1, and p14 genes, and Helicobacter pylori (H. pylori) status in individuals harboring esophageal columnar metaplasia.
METHODS: Distal esophageal mucosal samples obtained by endoscopy and histologically diagnosed as gastric-type (non-specialized) columnar metaplasia, were studied thoroughly. DNA was extracted from paraffin blocks, and methylation status of death-associated protein kinase (DAPK), thrombospondin-1 (THBS1), cadherin-1 (CDH1), and p14 genes, was examined using a methyl-sensitive polymerase chain reaction (MS-PCR) and sodium bisulfite modification protocol. H. pylori cagA status was determined by PCR.
RESULTS: In total, 68 subjects (33 females and 35 males), with a mean age of 52 years, were included. H. pylori cagA positive was present in the esophageal gastric-type metaplastic mucosa of 18 individuals. DAPK, THSB1, CDH1, and p14 gene promoters were methylated by MS-PCR in 40 (58.8%), 33 (48.5%), 46 (67.6%), and 23 (33.8%) cases of the 68 esophageal samples. H. pylori status was associated with methylation of DAPK (P = 0.003) and THBS1 (P = 0.019).
CONCLUSION: DNA methylation occurs in cases of gastric-type (non-specialized) columnar metaplasia of the esophagus, and this modification is associated with H. pylori cagA positive infection.
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ZHANG HUIPING, WANG YANHUA, CAO CHENGJIAN, YANG XIAOMING, MA SHENGCHAO, HAN XUEBO, YANG XIAOLING, YANG ANNING, TIAN JUE, XU HUA, ZHANG MINGHAO, JIANG YIDENG. A regulatory circuit involving miR-143 and DNMT3a mediates vascular smooth muscle cell proliferation induced by homocysteine. Mol Med Rep 2015; 13:483-90. [DOI: 10.3892/mmr.2015.4558] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2014] [Accepted: 09/25/2015] [Indexed: 11/06/2022] Open
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DNMT1 and EZH2 mediated methylation silences the microRNA-200b/a/429 gene and promotes tumor progression. Cancer Lett 2015; 359:198-205. [PMID: 25595591 DOI: 10.1016/j.canlet.2015.01.005] [Citation(s) in RCA: 132] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Revised: 12/12/2014] [Accepted: 01/08/2015] [Indexed: 12/16/2022]
Abstract
Aberrant expression of the microRNA-200 (miR-200) family has been linked to the occurrence and development of various types of malignant tumors, including hepatocellular carcinoma (HCC), colon cancer and breast cancer. However, little is known about the precise mechanism by which miR-200 expression is downregulated. The intricate relationship between DNA methylation and histone modifications has become a subject of increasing interest. The expression of miR-200 family members is modified by similar or complementary epigenetic mechanisms in MGC-803 and BGC-823 gastric cancer cells and U87 MG glioma cells. Chromatin immunoprecipitation assays revealed that DNA methyltransferase 1 (DNMT1) bound to miR-200b/a/429 promoter regions, indicating an interaction between DNMT1 and the miR-200b/a/429 promoter. Furthermore, Co-Immunoprecipitation (Co-IP) detection showed that DNMT1, together with the PcG protein Enhancer of Zeste homolog 2 (EZH2), a histone methyltransferase, contributed to the transcriptional repression of microRNA-200 family members. Knockdown of EZH2 not only impacted H3K27 trimethylation but also reduced DNMT1 presence on the miR-200b/a/429 promoter. EZH2 appeared to be essential for DNMT1 recruitment to the promoter region. Silencing EZH2 and DNMT1 using drugs or RNA interference dramatically reduced the levels of miR-200b/a/429 expression. Collectively, these results indicated that EZH2 and DNMT1-mediated epigenetic silencing contributed to the progression of gastric cancer and glioblastoma, and therefore represents a novel therapeutic target for malignant tumors.
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Cao XY, Ma HX, Shang YH, Jin MS, Kong F, Jia ZF, Cao DH, Wang YP, Suo J, Jiang J. DNA methyltransferase3a expression is an independent poor prognostic indicator in gastric cancer. World J Gastroenterol 2014; 20:8201-8. [PMID: 25009393 PMCID: PMC4081693 DOI: 10.3748/wjg.v20.i25.8201] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/13/2014] [Revised: 02/08/2014] [Accepted: 04/01/2014] [Indexed: 02/06/2023] Open
Abstract
AIM To explore the alteration of DNA methyltransferase expression in gastric cancer and to assess its prognostic value. METHODS From April 2000 to December 2010, 227 men and 73 women with gastric cancer were enrolled in the study. The expression of DNA methyltransferases (DNMTs), including DNMT1, DNMT3a and DNMT3b, in the 300 cases of gastric carcinoma, of which 85 had paired adjacent normal gastric mucus samples, was evaluated by immunohistochemistry using a tissue microarray. Serum anti-Helicobacter pylori (H. pylori) IgG was detected by enzyme-linked immunosorbent assay (ELISA). The relationships between the above results and the clinicopathological characteristics were analyzed. Their prognostic value was evaluated using the Cox proportional hazards model. RESULTS In gastric cancer, expression of DNMTs was mainly seen in the nucleus. Weak staining was also observed in the cytoplasm. Expression of DNMT1, DNMT3a and DNMT3b in gastric cancer was significantly higher compared to that in the paired control samples (60.0% vs 37.6%, 61.2% vs 4.7%, and 94.1% vs 71.8%, P < 0.01). The overall survival rate was significantly higher in the DNMT3a negative group than in the DNMT3a positive group in gastric cancer patients (Log-rank test, P = 0.032). No significant correlation was observed between DNMT1 and DNMT3b expression and the overall survival time (Log-rank test, P = 0.289, P = 0.347). Multivariate regression analysis indicated that DNMT3a expression (P = 0.025) and TNM stage (P < 0.001), but not DNMT1 (P = 0.54) or DNMT3b (P = 0.62), were independent prognostic factors in gastric cancer. H. pylori infection did not induce protein expression of DNMTs. CONCLUSION The results suggest that expression of DNMT3a is an independent poor prognostic indicator in gastric cancer. DNMT3a might play an important role in gastric carcinogenesis.
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