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Roy Choudhury S, Ashby C, Zhan F, van Rhee F. Epigenetic Deregulation of Telomere-Related Genes in Newly Diagnosed Multiple Myeloma Patients. Cancers (Basel) 2021; 13:cancers13246348. [PMID: 34944968 PMCID: PMC8699806 DOI: 10.3390/cancers13246348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Revised: 12/10/2021] [Accepted: 12/12/2021] [Indexed: 11/27/2022] Open
Abstract
High-risk Multiple Myeloma (MM) patients were found to maintain telomere length (TL), below the margin of short critical length, consistent with proactive overexpression of telomerase. Previously, DNA methylation has been shown as a determinant of telomere-related gene (TRG) expression and TL to assess risk in different types of cancer. We mapped genome-wide DNA methylation in a cohort of newly diagnosed MM (NDMM; n = 53) patients of major molecular subgroups, compared to age-matched healthy donors (n = 4). Differential methylation and expression at TRG-loci were analyzed in combination with overlapping chromatin marks and underlying DNA-sequences. We observed a strong correlation (R2 ≥ 0.5) between DNA methylation and expression amongst selective TRGs, such that demethylation at the promoters of DDX1 and TERF1 were associated to their oncogenic upregulation, while demethylation at the bodies of two key tumor suppressors ZNF208 and RAP1A led to downregulation of the genes. We demonstrated that TRG expression may be controlled by DNA methylation alone or in cooperation with chromatin modifications or CCCTC-binding factor at the regulatory regions. Additionally, we showed that hypomethylated DMRs of TRGs in NDMM are stabilized with G-quadruplex forming sequences, suggesting a crucial role of these epigenetically vulnerable loci in MM pathogenesis. We have identified a panel of five TRGs, which are epigenetically deregulated in NDMM patients and may serve as early detection biomarkers or therapeutic targets in the disease.
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Affiliation(s)
- Samrat Roy Choudhury
- Pediatric Hematology-Oncology, Arkansas Children’s Research Institute, University of Arkansas for Medical Sciences, Little Rock, AR 72202, USA
- Correspondence: ; Tel.: +1-(501)-364-7531 or +1-(501)-364-2873
| | - Cody Ashby
- Department of Biomedical Informatics, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA;
| | - Fenghuang Zhan
- Myeloma Center, Department of Internal Medicine, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA; (F.Z.); (F.v.R.)
| | - Frits van Rhee
- Myeloma Center, Department of Internal Medicine, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA; (F.Z.); (F.v.R.)
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2
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Singh P, Banerjee R, Piao S, Costa de Medeiros M, Bellile E, Liu M, Damodaran Puthiya Veettil D, Schmitd LB, Russo N, Danella E, Inglehart RC, Pineault KM, Wellik DM, Wolf G, D’Silva NJ. Squamous cell carcinoma subverts adjacent histologically normal epithelium to promote lateral invasion. J Exp Med 2021; 218:e20200944. [PMID: 33835136 PMCID: PMC8042603 DOI: 10.1084/jem.20200944] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2020] [Revised: 01/04/2021] [Accepted: 02/16/2021] [Indexed: 12/26/2022] Open
Abstract
Recurrent and new tumors, attributed in part to lateral invasion, are frequent in squamous cell carcinomas and lead to poor survival. We identified a mechanism by which cancer subverts adjacent histologically normal epithelium to enable small clusters of cancer cells to burrow undetected under adjacent histologically normal epithelium. We show that suppression of DMBT1 within cancer promotes aggressive invasion and metastasis in vivo and is associated with metastasis in patients. Cancer cells via TGFβ1 and TNFα also suppress DMBT1 in adjacent histologically normal epithelium, thereby subverting it to promote invasion of a small population of tumor cells. The sufficiency of DMBT1 in this process is demonstrated by significantly higher satellite tumor nests in Dmbt1-/- compared with wild-type mice. Moreover, in patients, invasion of small tumor nests under adjacent histologically normal epithelium is associated with increased risk for recurrence and shorter disease-free survival. This study demonstrates a crucial role of adjacent histologically normal epithelium in invasion and its important role in the tumor microenvironment and opens new possibilities for therapeutic strategies that reduce tumor recurrence.
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Affiliation(s)
- Priyanka Singh
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI
| | - Rajat Banerjee
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI
| | - Songlin Piao
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI
| | - Marcell Costa de Medeiros
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI
| | - Emily Bellile
- Department of Biostatistics, School of Public Health, University of Michigan, Ann Arbor, MI
| | - Min Liu
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI
| | | | - Ligia B. Schmitd
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI
| | - Nickole Russo
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI
| | - Erika Danella
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI
| | - Ronald C. Inglehart
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI
| | - Kyriel M. Pineault
- Department of Cell and Regenerative Biology, University of Wisconsin-Madison, Madison, WI
| | - Deneen M. Wellik
- Department of Cell and Regenerative Biology, University of Wisconsin-Madison, Madison, WI
| | - Greg Wolf
- Department of Otolaryngology, University of Michigan, Ann Arbor, MI
| | - Nisha J. D’Silva
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI
- Department of Pathology, Medical School, University of Michigan, Ann Arbor, MI
- Rogel Cancer Center, University of Michigan, Ann Arbor, MI
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3
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Liu M, Banerjee R, Rossa C, D'Silva NJ. RAP1-RAC1 Signaling Has an Important Role in Adhesion and Migration in HNSCC. J Dent Res 2020; 99:959-968. [PMID: 32401565 DOI: 10.1177/0022034520917058] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Cell-cell adhesion is a key mechanism to control tissue integrity and migration. In head and neck squamous cell carcinoma (HNSCC), cell migration facilitates distant metastases and is correlated with poor prognosis. RAP1, a ras-like protein, has an important role in the progression of HNSCC. RAC1 is an integrin-linked, ras-like protein that promotes cell migration. Here we show that loss of cell-cell adhesion is correlated with inactivation of RAP1 confirmed by 2 different biochemical approaches. RAP1 activation is required for cell-matrix adhesion confirmed by adhesion to fibronectin-coated plates with cells that have biochemically activated RAP1. This effect is reversed when RAP1 is inactivated. In addition, RAP1GTP-mediated adhesion is only facilitated through α5β1 integrin complex and is not a function of either α5 or β1 integrin alone. Moreover, the inside-out signaling of RAP1 activation is coordinated with RAC1 activation. These findings show that RAP1 has a prominent role in cell-matrix adhesion via extracellular matrix molecule fibronectin-induced α5β1 integrin and supports a critical role for the RAP1/RAC1 signaling axis in HNSCC cell migration.
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Affiliation(s)
- M Liu
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, USA
| | - R Banerjee
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, USA
| | - C Rossa
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, USA.,Department of Diagnosis and Surgery, School of Dentistry at Araraquara, UNESP-Univ Estadual Paulista, Araraquara, SP, Brazil
| | - N J D'Silva
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, USA.,Department of Pathology, Medical School; University of Michigan, Ann Arbor, MI, USA
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Zamarian V, Catozzi C, Ressel L, Finotello R, Ceciliani F, Vilafranca M, Altimira J, Lecchi C. MicroRNA Expression in Formalin-Fixed, Paraffin-Embedded Samples of Canine Cutaneous and Oral Melanoma by RT-qPCR. Vet Pathol 2019; 56:848-855. [PMID: 31526125 DOI: 10.1177/0300985819868646] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
MicroRNAs (miRNAs) are a class of small, noncoding RNA that post-transcriptionally regulate protein expression. miRNAs are emerging as clinical biomarkers of many diseases, including tumors. The aim of this study was to investigate whether miRNA expression could vary in melanoma samples derived from formalin-fixed, paraffin-embedded (FFPE) tissues. The study included 4 groups: (1) 9 samples of oral canine malignant melanoma, (2) 10 samples of cutaneous malignant melanoma, (3) 5 samples of healthy oral mucosa, and (4) 7 samples of healthy skin. The expression levels of 6 miRNAs-miR-145, miR-146a, miR-425-5p, miR-223, miR-365, and miR-134-were detected and assessed by quantitative reverse transcription polymerase chain reaction (RT-qPCR) using TaqMan probes. Cutaneous canine malignant melanoma showed a decrease of the expression level of miR-145 and miR-365 and an increase of miR-146a and miR-425-5p compared to control samples. MiR-145 was also downregulated in oral canine malignant melanoma. The miRNAs with decreased expression may regulate genes involved in RAS, Rap1, and transforming growth factor β (TGF-β) signaling pathways, as well as upregulated genes associated with phosphatidylinositol signaling system, adherens junction, and RAS signaling pathways. In conclusion, miR-145, miR-365, miR-146a, and miR-425-5p were differentially expressed in canine malignant melanoma and healthy FFPE samples, suggesting that they may play a role in canine malignant melanoma pathogenesis.
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Affiliation(s)
- Valentina Zamarian
- Dipartimento di Medicina Veterinaria, Università degli Studi di Milano, Milano, Italy
| | - Carlotta Catozzi
- Dipartimento di Medicina Veterinaria, Università degli Studi di Milano, Milano, Italy
| | - Lorenzo Ressel
- Department of Veterinary Pathology, Public Health Institute of Veterinary Science, University of Liverpool, Neston, UK
| | - Riccardo Finotello
- Department of Small Animal Clinical Science, Institute of Veterinary Science, University of Liverpool, Neston, UK
| | - Fabrizio Ceciliani
- Dipartimento di Medicina Veterinaria, Università degli Studi di Milano, Milano, Italy
| | | | - Jaume Altimira
- HISTOVET Veterinary Diagnostic Service, Barcelona, Spain
| | - Cristina Lecchi
- Dipartimento di Medicina Veterinaria, Università degli Studi di Milano, Milano, Italy
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Wu J, Niu Q, Yuan J, Xu X, Cao L. Novel compound cedrelone inhibits hepatocellular carcinoma progression via PBLD and Ras/Rap1. Exp Ther Med 2019; 18:4209-4220. [PMID: 31777531 PMCID: PMC6862430 DOI: 10.3892/etm.2019.8080] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Accepted: 07/12/2019] [Indexed: 12/20/2022] Open
Abstract
Although it is known that Phenazine biosynthesis-like domain-containing protein (PBLD) expression is downregulated in hepatocellular carcinoma (HCC), its biological function is unclear. Additionally, no agents capable of upregulating PBLD exist. In the current study, the relationship between PBLD and HCC was analyzed using clinicopathological specimens. A HCC cell model, microarray analysis and an animal model were used to verify the therapeutic effect of cedrelone on HCC. The present study demonstrated that PBLD inhibited HCC progression. Furthermore, the present study revealed that cedrelone possessed treated-HCC capabilities via targeted PBLD overexpression. The epithelial-mesenchymal transition phenotype and growth rate were inhibited and the apoptosis ratio was promoted by cedrelone following PBLD overexpression. The Ras and Ras-proximate-1 signaling pathways were also determined to be regulated by cedrelone via PBLD activation in HCC. PBLD may therefore be an independent predictor of HCC progression and a novel target for HCC treatment. Additionally, the PBLD activator, cedrelone, may be a potential drug for HCC treatment in the future.
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Affiliation(s)
- Jiansong Wu
- Department of Infectious Diseases, General Hospital of the People's Liberation Army Rocket Force, Beijing 100088, P.R. China
| | - Qiang Niu
- Department of Infectious Diseases, General Hospital of the People's Liberation Army Rocket Force, Beijing 100088, P.R. China
| | - Jie Yuan
- Department of Infectious Diseases, General Hospital of the People's Liberation Army Rocket Force, Beijing 100088, P.R. China
| | - Xiaodan Xu
- Department of Infectious Diseases, General Hospital of the People's Liberation Army Rocket Force, Beijing 100088, P.R. China
| | - Liuxia Cao
- Department of Infectious Diseases, General Hospital of the People's Liberation Army Rocket Force, Beijing 100088, P.R. China
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Dong Z, Wang J, Zhang H, Zhan T, Chen Y, Xu S. Identification of potential key genes in esophageal adenocarcinoma using bioinformatics. Exp Ther Med 2019; 18:3291-3298. [PMID: 31616504 PMCID: PMC6781836 DOI: 10.3892/etm.2019.7973] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2017] [Accepted: 11/07/2018] [Indexed: 12/29/2022] Open
Abstract
Esophageal adenocarcinoma (EAC) is the predominant pathological subtype of esophageal cancer in Europe and the USA. The present bioinformatics study analyzed a high-throughput sequencing dataset, GSE94869, to determine differentially expressed genes (DEGs) in order to identify key genes, biological processes and pathways associated with EAC. Functional enrichment analysis was performed using the Database for Annotation Visualization and Integrated Discovery. The co-expression network of the DEGs was established using Weighted Gene Co-Expression Network Analysis and visualized using Cytoscape. A Kaplan-Meier analysis based on The Cancer Genome Atlas (TCGA) database was used to identify prognosis-associated genes. Univariate and multivariate Cox proportional hazard models were used to identify genes with a prognostic value regarding relapse-free survival (RFS), while validation of the differential expression of prognosis-associated genes was performed using a box plot based on data from TCGA and another microarray dataset, GSE26886. A total of 130 DEGs, comprising 82 upregulated and 48 downregulated genes, were identified. The upregulated DEGs were significantly associated with extracellular matrix organization, disassembly, and the phosphoinositide-3 kinase/AKT, Rap1 and Ras signaling pathways, while the downregulated genes were associated with the Wnt signalling pathway. Subsequently, two co-expression modules were established and 20 hub genes were identified. The blue module was associated with the Rap1 signaling pathway, while the turquoise module was associated with the Ras and Rap1 signaling pathways. Among them, methyltransferase like 7B (METTL7B) was associated with RFS. Furthermore, the overexpression of METTL7B in EAC was successfully validated using data from TCGA and GSE26886. The present study identified key genes and provides potential biomarkers for the diagnosis and treatment of EAC.
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Affiliation(s)
- Zhiyu Dong
- Department of Gastroenterology, Tongji Hospital, Tongji University School of Medicine, Shanghai 200065, P.R. China
| | - Junwen Wang
- Department of Gastroenterology, Tongji Hospital, Tongji University School of Medicine, Shanghai 200065, P.R. China
| | - Haiqin Zhang
- Department of Gastroenterology, Tongji Hospital, Tongji University School of Medicine, Shanghai 200065, P.R. China
| | - Tingting Zhan
- Department of Gastroenterology, Tongji Hospital, Tongji University School of Medicine, Shanghai 200065, P.R. China
| | - Ying Chen
- Department of Gastroenterology, Tongji Hospital, Tongji University School of Medicine, Shanghai 200065, P.R. China
| | - Shuchang Xu
- Department of Gastroenterology, Tongji Hospital, Tongji University School of Medicine, Shanghai 200065, P.R. China
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7
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Yang H, Jin X, Dan H, Chen Q. Histone modifications in oral squamous cell carcinoma and oral potentially malignant disorders. Oral Dis 2019; 26:719-732. [PMID: 31056829 DOI: 10.1111/odi.13115] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2018] [Revised: 04/17/2019] [Accepted: 04/29/2019] [Indexed: 02/05/2023]
Affiliation(s)
- Huamei Yang
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Chinese Academy of Medical Sciences Research Unit of Oral Medicine of Carcinogenesis and Management West China Hospital of Stomatology, Sichuan University Chengdu China
| | - Xin Jin
- College of Stomatology Chongqing Medical University Chongqing China
- Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences Chongqing China
| | - Hongxia Dan
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Chinese Academy of Medical Sciences Research Unit of Oral Medicine of Carcinogenesis and Management West China Hospital of Stomatology, Sichuan University Chengdu China
| | - Qianming Chen
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Chinese Academy of Medical Sciences Research Unit of Oral Medicine of Carcinogenesis and Management West China Hospital of Stomatology, Sichuan University Chengdu China
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8
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Mohammed A, Biegert G, Adamec J, Helikar T. Identification of potential tissue-specific cancer biomarkers and development of cancer versus normal genomic classifiers. Oncotarget 2017; 8:85692-85715. [PMID: 29156751 PMCID: PMC5689641 DOI: 10.18632/oncotarget.21127] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Accepted: 09/05/2017] [Indexed: 01/15/2023] Open
Abstract
Machine learning techniques for cancer prediction and biomarker discovery can hasten cancer detection and significantly improve prognosis. Recent “OMICS” studies which include a variety of cancer and normal tissue samples along with machine learning approaches have the potential to further accelerate such discovery. To demonstrate this potential, 2,175 gene expression samples from nine tissue types were obtained to identify gene sets whose expression is characteristic of each cancer class. Using random forests classification and ten-fold cross-validation, we developed nine single-tissue classifiers, two multi-tissue cancer-versus-normal classifiers, and one multi-tissue normal classifier. Given a sample of a specified tissue type, the single-tissue models classified samples as cancer or normal with a testing accuracy between 85.29% and 100%. Given a sample of non-specific tissue type, the multi-tissue bi-class model classified the sample as cancer versus normal with a testing accuracy of 97.89%. Given a sample of non-specific tissue type, the multi-tissue multi-class model classified the sample as cancer versus normal and as a specific tissue type with a testing accuracy of 97.43%. Given a normal sample of any of the nine tissue types, the multi-tissue normal model classified the sample as a particular tissue type with a testing accuracy of 97.35%. The machine learning classifiers developed in this study identify potential cancer biomarkers with sensitivity and specificity that exceed those of existing biomarkers and pointed to pathways that are critical to tissue-specific tumor development. This study demonstrates the feasibility of predicting the tissue origin of carcinoma in the context of multiple cancer classes.
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Affiliation(s)
- Akram Mohammed
- Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, Nebraska, USA
| | - Greyson Biegert
- Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, Nebraska, USA
| | - Jiri Adamec
- Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, Nebraska, USA
| | - Tomáš Helikar
- Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, Nebraska, USA
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Pascoal-Xavier MA, Figueiredo ACC, Gomes LI, Peruhype-Magalhães V, Calzavara-Silva CE, Costa MA, Reis IA, Bonjardim CA, Kroon EG, de Oliveira JG, Ferreira PCP. RAP1 GTPase overexpression is associated with cervical intraepithelial neoplasia. PLoS One 2015; 10:e0123531. [PMID: 25856570 PMCID: PMC4391937 DOI: 10.1371/journal.pone.0123531] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Accepted: 02/19/2015] [Indexed: 01/06/2023] Open
Abstract
RAP1 (RAS proximate 1), a small GTP-binding protein of the RAS superfamily, is a putative oncogene that is highly expressed in several malignant cell lines and types of cancers, including some types of squamous cell carcinoma. However, the participation of RAP1 in cervical carcinogenesis is unknown. We conducted a cross-sectional study of paraffin-embedded cervical biopsies to determine the association of RAP1 with cervical intraepithelial neoplasia (CIN). Standard and quantitative immunohistochemistry assessment of RAP1 expression in fixed tissue was performed on 183 paraffin-embedded cervical biopsies that were classified as normal or non-dysplastic mucosa (NDM) (n = 33); CIN grade 1 (n = 84) and CIN grade 2/3 (n = 66). A gradual increase in RAP1 expression in NDM < CIN 1 < CIN 2/3 (p<0.001) specimens was observed and was in agreement with the histopathologic diagnosis. A progressive increase in the RAP1 expression levels increased the risk of CIN 1 [odds ratio (OR) = 3.50; 95% confidence interval (CI) 1.30-10.64] 3.5 fold and the risk of CIN 2/3 (OR = 19.86, 95% CI 6.40-70.79) nearly 20 fold when compared to NDM. In addition, stereotype ordinal regression analysis showed that this progressive increase in RAP1 expression more strongly impacted CIN 2/3 than CIN 1. Our findings suggest that RAP1 may be a useful biomarker for the diagnosis of CIN.
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Affiliation(s)
- Marcelo Antonio Pascoal-Xavier
- Departamento de Microbiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brasil
| | | | | | | | | | - Marcelo Azevedo Costa
- Departamento de Engenharia de Produção, Escola de Engenharia, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brasil
| | - Ilka Afonso Reis
- Departamento de Estatística, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brasil
| | - Claudio Antônio Bonjardim
- Departamento de Microbiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brasil
| | - Erna Geessien Kroon
- Departamento de Microbiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brasil
| | | | - Paulo César Peregrino Ferreira
- Departamento de Microbiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brasil
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Sayyah J, Bartakova A, Nogal N, Quilliam LA, Stupack DG, Brown JH. The Ras-related protein, Rap1A, mediates thrombin-stimulated, integrin-dependent glioblastoma cell proliferation and tumor growth. J Biol Chem 2014; 289:17689-98. [PMID: 24790104 DOI: 10.1074/jbc.m113.536227] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Rap1 is a Ras family GTPase with a well documented role in ERK/MAP kinase signaling and integrin activation. Stimulation of the G-protein-coupled receptor PAR-1 with thrombin in human 1321N1 glioblastoma cells led to a robust increase in Rap1 activation. This response was sustained for up to 6 h and mediated through RhoA and phospholipase D (PLD). Thrombin treatment also induced a 5-fold increase in cell adhesion to fibronectin, which was blocked by down-regulating PLD or Rap1A or by treatment with a β1 integrin neutralizing antibody. In addition, thrombin treatment led to increases in phospho-focal adhesion kinase (tyrosine 397), ERK1/2 phosphorylation and cell proliferation, which were significantly inhibited in cells treated with β1 integrin antibody or Rap1A siRNA. To assess the role of Rap1A in tumor formation in vivo, we compared growth of 1321N1 cells stably expressing control, Rap1A or Rap1B shRNA in a mouse xenograft model. Deletion of Rap1A, but not of Rap1B, reduced tumor mass by >70% relative to control. Similar observations were made with U373MG glioblastoma cells in which Rap1A was down-regulated. Collectively, these findings implicate a Rap1A/β1 integrin pathway, activated downstream of G-protein-coupled receptor stimulation and RhoA, in glioblastoma cell proliferation. Moreover, our data demonstrate a critical role for Rap1A in glioblastoma tumor growth in vivo.
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Affiliation(s)
| | - Alena Bartakova
- Pathology, University of California at San Diego, La Jolla, California 92093 and
| | | | - Lawrence A Quilliam
- the Department of Biochemistry and Molecular Biology, Indiana University, Indianapolis, Indiana 46202
| | - Dwayne G Stupack
- Pathology, University of California at San Diego, La Jolla, California 92093 and
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11
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Abstract
Seminal discoveries have established that epigenetic modifications are important for driving tumor progression. Polycomb group (PcG) proteins are highly conserved epigenetic effectors that maintain, by posttranslational modification of histones, the silenced state of genes involved in critical biologic processes, including cellular development, stem cell plasticity, and tumor progression. PcG proteins are found in two multimeric protein complexes called Polycomb repressive complexes: PRC1 and PRC2. Enhancer of zeste homolog 2 (EZH2), catalytic core subunit of PRC2, epigenetically silences several tumor-suppressor genes by catalyzing the trimethylation of histone H3 at lysine 27, which serves as a docking site for DNA methyltransferases and histone deacetylases. Evidence suggests that overexpression of EZH2 is strongly associated with cancer progression and poor outcome in disparate cancers, including hematologic and epithelial malignancies. The regulatory circuit and molecular cues causing EZH2 deregulation vary in different cancer types. Therefore, this review provides a comprehensive overview on the oncogenic role of EZH2 during tumorigenesis and highlights the multifaceted role of EZH2, as either a transcriptional activator or repressor depending on the cellular context. Additional insight is provided on the recent understanding of the causes and consequences of EZH2 overexpression in specific cancer types. Finally, evidence is discussed on how EZH2 has emerged as a promising target in anticancer therapy and the prospects for targeting EZH2 without affecting global methylation status. Thus, a better understanding of the complex epigenetic regulatory network controlling EZH2 expression and target genes facilitates the design of novel therapeutic interventions.
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Affiliation(s)
- Gauri Deb
- Authors' Affiliations: Department of Urology, University Hospitals Case Medical Center; 2Department of Nutrition, Case Western Reserve University; 3Division of General Medical Sciences, Case Comprehensive Cancer Center, Cleveland, Ohio; 4Department of Biotechnology, Indian Institute of Technology, Guwahati, Assam; and 5Biochemistry Division, CSIR-Central Drug Research Institute, Lucknow, Uttar Pradesh, India
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12
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Xu B, Abourbih S, Sircar K, Kassouf W, Mansure JJ, Aprikian A, Tanguay S, Brimo F. Enhancer of zeste homolog 2 expression is associated with metastasis and adverse clinical outcome in clear cell renal cell carcinoma: a comparative study and review of the literature. Arch Pathol Lab Med 2013; 137:1326-36. [PMID: 24079759 DOI: 10.5858/arpa.2012-0525-oa] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
CONTEXT Enhancer of zeste homolog 2 (EZH2), a histone methyltransferase mediating chromatin condensation and epigenetic modulation, is overexpressed in various human carcinomas and is associated with adverse clinicopathologic characteristics and biologic behavior. The expression of EZH2 in renal cell carcinomas (RCCs) has not been fully characterized yet. OBJECTIVE To evaluate the prognostic role of EZH2 in RCC by analyzing the immunohistochemical staining pattern of the marker in relation to pathologic features and clinical outcome. DESIGN We correlated the immunolabeling of EZH2 with multiple clinicopathologic features, including Fuhrman nuclear grade, pathologic stage, metastatic status, and clinical outcome in 223 clear cell RCCs (CRCCs) and 21 papillary RCCs, by using tissue microarrays of primary and metastatic cases. RESULTS Most CRCCs (75%) showed positive EZH2 staining, with most primary tumors showing focal staining in comparison to nonfocal staining in metastatic cases. In primary tumors, EZH2 expression was associated with higher nuclear grade and lower pathologic stage. Metastatic tumors showed a higher number of positive cases (81% versus 67%) and a more diffuse and more intense pattern of staining than primary CRCCs. For the 22 locally advanced primary tumors (T3/4) and 43 metastatic RCCs, patients who experienced RCC-related deaths significantly overexpressed the marker in comparison to patients who did not experience RCC-related mortality. CONCLUSIONS By showing that EZH2 expression is associated with increased metastatic potential and a worse clinical outcome, this study suggests that EZH2 can serve as a prognostic biomarker for RCC, thus confirming it as a key molecule driving oncogenesis and metastasis.
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Affiliation(s)
- Bin Xu
- From the Departments of Pathology (Drs Xu and Brimo) and Urology (Drs Abourbih, Kassouf, Mansure, Aprikian, and Tanguay), McGill University Health Centre, Montreal, Quebec, Canada; and the Department of Pathology (Dr Sircar), The University of Texas Maryland Anderson Cancer Center, Houston
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The Histone Methyltransferase EZH2 Mediates Tumor Progression on the Chick Chorioallantoic Membrane Assay, a Novel Model of Head and Neck Squamous Cell Carcinoma. Transl Oncol 2013; 6:273-81. [PMID: 23730406 DOI: 10.1593/tlo.13175] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2013] [Revised: 02/25/2013] [Accepted: 02/28/2013] [Indexed: 11/18/2022] Open
Abstract
Current in vivo models for head and neck squamous cell carcinoma (HNSCC) have limitations in simulating some essential tumorigenic phenotypes, such as invasion. Most mouse models of human HNSCC are inadequate because tumor cells are injected directly into the connective tissue, thereby bypassing the basement membrane of the surface epithelium, the first barrier to invasion. In this manuscript, we establish the chick chorioallantoic membrane (CAM) assay as an in vivomodel of human HNSCC tumor progression. Using the CAM model of HNSCC, we investigated the role of enhancer of zeste homolog 2 (EZH2), a histone methyltransferase, in multiple aspects of HNSCC tumor progression. We found that knockdown of EZH2 reduced tumor size, angiogenesis, invasion, and metastasis of tumors produced by grafting human HNSCC cells onto the CAM. In addition, we demonstrate that EZH2 expression mediates a mesenchymal phenotype in HNSCC cell lines and mouse tumors. These findings demonstrate the advantages of the newly proposed CAM model of human HNSCC and highlight the emerging role of EZH2 in HSNCC tumor progression.
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