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Cosi I, Moccia A, Pescucci C, Munagala U, Di Giorgio S, Sineo I, Conticello SG, Notaro R, De Angioletti M. Identification and characterization of novel ETV4 splice variants in prostate cancer. Sci Rep 2023; 13:5267. [PMID: 37002241 PMCID: PMC10066307 DOI: 10.1038/s41598-023-29484-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Accepted: 02/06/2023] [Indexed: 04/03/2023] Open
Abstract
ETV4, one of ETS proteins overexpressed in prostate cancer, promotes migration, invasion, and proliferation in prostate cells. This study identifies a series of previously unknown ETV4 alternatively spliced transcripts in human prostate cell lines. Their expression has been validated using several unbiased techniques, including Nanopore sequencing. Most of these transcripts originate from an in-frame exon skipping and, thus, are expected to be translated into ETV4 protein isoforms. Functional analysis of the most abundant among these isoforms shows that they still bear an activity, namely a reduced ability to promote proliferation and a residual ability to regulate the transcription of ETV4 target genes. Alternatively spliced genes are common in cancer cells: an analysis of the TCGA dataset confirms the abundance of these novel ETV4 transcripts in prostate tumors, in contrast to peritumoral tissues. Since none of their translated isoforms have acquired a higher oncogenic potential, such abundance is likely to reflect the tumor deranged splicing machinery. However, it is also possible that their interaction with the canonical variants may contribute to the biology and the clinics of prostate cancer. Further investigations are needed to elucidate the biological role of these ETV4 transcripts and of their putative isoforms.
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Affiliation(s)
- Irene Cosi
- Core Research Laboratory, Istituto per lo Studio, la Prevenzione e la Rete Oncologica (ISPRO), Viale Pieraccini 6, 50139, Florence, Italy
- ICCOM - National Research Council, Sesto Fiorentino, Florence, Italy
| | - Annalisa Moccia
- Core Research Laboratory, Istituto per lo Studio, la Prevenzione e la Rete Oncologica (ISPRO), Viale Pieraccini 6, 50139, Florence, Italy
| | - Chiara Pescucci
- Core Research Laboratory, Istituto per lo Studio, la Prevenzione e la Rete Oncologica (ISPRO), Viale Pieraccini 6, 50139, Florence, Italy
| | - Uday Munagala
- Core Research Laboratory, Istituto per lo Studio, la Prevenzione e la Rete Oncologica (ISPRO), Viale Pieraccini 6, 50139, Florence, Italy
| | - Salvatore Di Giorgio
- Core Research Laboratory, Istituto per lo Studio, la Prevenzione e la Rete Oncologica (ISPRO), Viale Pieraccini 6, 50139, Florence, Italy
| | - Irene Sineo
- Core Research Laboratory, Istituto per lo Studio, la Prevenzione e la Rete Oncologica (ISPRO), Viale Pieraccini 6, 50139, Florence, Italy
| | - Silvestro G Conticello
- Core Research Laboratory, Istituto per lo Studio, la Prevenzione e la Rete Oncologica (ISPRO), Viale Pieraccini 6, 50139, Florence, Italy
- IFC - National Research Council, Pisa, Italy
| | - Rosario Notaro
- Core Research Laboratory, Istituto per lo Studio, la Prevenzione e la Rete Oncologica (ISPRO), Viale Pieraccini 6, 50139, Florence, Italy
- IFC - National Research Council, Pisa, Italy
| | - Maria De Angioletti
- Core Research Laboratory, Istituto per lo Studio, la Prevenzione e la Rete Oncologica (ISPRO), Viale Pieraccini 6, 50139, Florence, Italy.
- ICCOM - National Research Council, Sesto Fiorentino, Florence, Italy.
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Scaravilli M, Koivukoski S, Latonen L. Androgen-Driven Fusion Genes and Chimeric Transcripts in Prostate Cancer. Front Cell Dev Biol 2021; 9:623809. [PMID: 33634124 PMCID: PMC7900491 DOI: 10.3389/fcell.2021.623809] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Accepted: 01/14/2021] [Indexed: 12/15/2022] Open
Abstract
Androgens are steroid hormones governing the male reproductive development and function. As such, androgens and the key mediator of their effects, androgen receptor (AR), have a leading role in many diseases. Prostate cancer is a major disease where AR and its transcription factor function affect a significant number of patients worldwide. While disease-related AR-driven transcriptional programs are connected to the presence and activity of the receptor itself, also novel modes of transcriptional regulation by androgens are exploited by cancer cells. One of the most intriguing and ingenious mechanisms is to bring previously unconnected genes under the control of AR. Most often this occurs through genetic rearrangements resulting in fusion genes where an androgen-regulated promoter area is combined to a protein-coding area of a previously androgen-unaffected gene. These gene fusions are distinctly frequent in prostate cancer compared to other common solid tumors, a phenomenon still requiring an explanation. Interestingly, also another mode of connecting androgen regulation to a previously unaffected gene product exists via transcriptional read-through mechanisms. Furthermore, androgen regulation of fusion genes and transcripts is not linked to only protein-coding genes. Pseudogenes and non-coding RNAs (ncRNAs), including long non-coding RNAs (lncRNAs) can also be affected by androgens and de novo functions produced. In this review, we discuss the prevalence, molecular mechanisms, and functional evidence for androgen-regulated prostate cancer fusion genes and transcripts. We also discuss the clinical relevance of especially the most common prostate cancer fusion gene TMPRSS2-ERG, as well as present open questions of prostate cancer fusions requiring further investigation.
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Affiliation(s)
- Mauro Scaravilli
- Institute of Biomedicine, University of Eastern Finland, Kuopio, Finland
| | - Sonja Koivukoski
- Institute of Biomedicine, University of Eastern Finland, Kuopio, Finland
| | - Leena Latonen
- Institute of Biomedicine, University of Eastern Finland, Kuopio, Finland
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Yan W, Jamal M, Tan SH, Song Y, Young D, Chen Y, Katta S, Ying K, Ravindranath L, Woodle T, Kohaar I, Cullen J, Kagan J, Srivastava S, Dobi A, McLeod DG, Rosner IL, Sesterhenn IA, Srinivasan A, Srivastava S, Petrovics G. Molecular profiling of radical prostatectomy tissue from patients with no sign of progression identifies ERG as the strongest independent predictor of recurrence. Oncotarget 2019; 10:6466-6483. [PMID: 31741711 PMCID: PMC6849651 DOI: 10.18632/oncotarget.27294] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2019] [Accepted: 10/19/2019] [Indexed: 01/16/2023] Open
Abstract
BACKGROUND As a major cause of morbidity and mortality among men, prostate cancer is a heterogenous disease, with a vast heterogeneity in the biology of the disease and in clinical outcome. While it often runs an indolent course, local progression or metastasis may eventually develop, even among patients considered "low risk" at diagnosis. Therefore, biomarkers that can discriminate aggressive from indolent disease at an early stage would greatly benefit patients. We hypothesized that tissue specimens from early stage prostate cancers may harbor predictive signatures for disease progression. METHODS We used a cohort of radical prostatectomy patients with longitudinal follow-up, who had tumors with low grade and stage that revealed no signs of future disease progression at surgery. During the follow-up period, some patients either remained indolent (non-BCR) or progressed to biochemical recurrence (BCR). Total RNA was extracted from tumor, and adjacent normal epithelium of formalin-fixed-paraffin-embedded (FFPE) specimens. Differential gene expression in tumors, and in tumor versus normal tissues between BCR and non-BCR patients were analyzed by NanoString using a customized CodeSet of 151 probes. RESULTS After controlling for false discovery rates, we identified a panel of eight genes (ERG, GGT1, HDAC1, KLK2, MYO6, PLA2G7, BICD1 and CACNAID) that distinguished BCR from non-BCR patients. We found a clear association of ERG expression with non-BCR, which was further corroborated by quantitative RT-PCR and immunohistochemistry assays. CONCLUSIONS Our results identified ERG as the strongest predictor for BCR and showed that potential prognostic prostate cancer biomarkers can be identified from FFPE tumor specimens.
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Affiliation(s)
- Wusheng Yan
- Henry Jackson Foundation for the Advancement of Military Medicine (HJF), Bethesda, MD, USA
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University of the Health Sciences and the Walter Reed National Military Medical Center, Bethesda, MD, USA
- These authors contributed equally to this work
| | - Muhammad Jamal
- Henry Jackson Foundation for the Advancement of Military Medicine (HJF), Bethesda, MD, USA
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University of the Health Sciences and the Walter Reed National Military Medical Center, Bethesda, MD, USA
- These authors contributed equally to this work
| | - Shyh-Han Tan
- Henry Jackson Foundation for the Advancement of Military Medicine (HJF), Bethesda, MD, USA
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University of the Health Sciences and the Walter Reed National Military Medical Center, Bethesda, MD, USA
- These authors contributed equally to this work
| | - Yingjie Song
- Henry Jackson Foundation for the Advancement of Military Medicine (HJF), Bethesda, MD, USA
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University of the Health Sciences and the Walter Reed National Military Medical Center, Bethesda, MD, USA
| | - Denise Young
- Henry Jackson Foundation for the Advancement of Military Medicine (HJF), Bethesda, MD, USA
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University of the Health Sciences and the Walter Reed National Military Medical Center, Bethesda, MD, USA
| | - Yongmei Chen
- Henry Jackson Foundation for the Advancement of Military Medicine (HJF), Bethesda, MD, USA
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University of the Health Sciences and the Walter Reed National Military Medical Center, Bethesda, MD, USA
| | - Shilpa Katta
- Henry Jackson Foundation for the Advancement of Military Medicine (HJF), Bethesda, MD, USA
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University of the Health Sciences and the Walter Reed National Military Medical Center, Bethesda, MD, USA
| | - Kai Ying
- Henry Jackson Foundation for the Advancement of Military Medicine (HJF), Bethesda, MD, USA
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University of the Health Sciences and the Walter Reed National Military Medical Center, Bethesda, MD, USA
| | - Lakshmi Ravindranath
- Henry Jackson Foundation for the Advancement of Military Medicine (HJF), Bethesda, MD, USA
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University of the Health Sciences and the Walter Reed National Military Medical Center, Bethesda, MD, USA
| | - Tarah Woodle
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University of the Health Sciences and the Walter Reed National Military Medical Center, Bethesda, MD, USA
| | - Indu Kohaar
- Henry Jackson Foundation for the Advancement of Military Medicine (HJF), Bethesda, MD, USA
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University of the Health Sciences and the Walter Reed National Military Medical Center, Bethesda, MD, USA
| | - Jennifer Cullen
- Henry Jackson Foundation for the Advancement of Military Medicine (HJF), Bethesda, MD, USA
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University of the Health Sciences and the Walter Reed National Military Medical Center, Bethesda, MD, USA
- John P. Murtha Cancer Center, Walter Reed National Military Medical Center, Bethesda, MD, USA
| | - Jacob Kagan
- Division of Cancer Prevention, National Cancer Institute, NIH, Bethesda, MD, USA
| | - Sudhir Srivastava
- Division of Cancer Prevention, National Cancer Institute, NIH, Bethesda, MD, USA
| | - Albert Dobi
- Henry Jackson Foundation for the Advancement of Military Medicine (HJF), Bethesda, MD, USA
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University of the Health Sciences and the Walter Reed National Military Medical Center, Bethesda, MD, USA
- John P. Murtha Cancer Center, Walter Reed National Military Medical Center, Bethesda, MD, USA
| | - David G. McLeod
- Henry Jackson Foundation for the Advancement of Military Medicine (HJF), Bethesda, MD, USA
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University of the Health Sciences and the Walter Reed National Military Medical Center, Bethesda, MD, USA
- John P. Murtha Cancer Center, Walter Reed National Military Medical Center, Bethesda, MD, USA
| | - Inger L. Rosner
- Henry Jackson Foundation for the Advancement of Military Medicine (HJF), Bethesda, MD, USA
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University of the Health Sciences and the Walter Reed National Military Medical Center, Bethesda, MD, USA
- John P. Murtha Cancer Center, Walter Reed National Military Medical Center, Bethesda, MD, USA
| | | | - Alagarsamy Srinivasan
- Henry Jackson Foundation for the Advancement of Military Medicine (HJF), Bethesda, MD, USA
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University of the Health Sciences and the Walter Reed National Military Medical Center, Bethesda, MD, USA
| | - Shiv Srivastava
- Henry Jackson Foundation for the Advancement of Military Medicine (HJF), Bethesda, MD, USA
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University of the Health Sciences and the Walter Reed National Military Medical Center, Bethesda, MD, USA
- John P. Murtha Cancer Center, Walter Reed National Military Medical Center, Bethesda, MD, USA
| | - Gyorgy Petrovics
- Henry Jackson Foundation for the Advancement of Military Medicine (HJF), Bethesda, MD, USA
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University of the Health Sciences and the Walter Reed National Military Medical Center, Bethesda, MD, USA
- John P. Murtha Cancer Center, Walter Reed National Military Medical Center, Bethesda, MD, USA
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Calcium and Nuclear Signaling in Prostate Cancer. Int J Mol Sci 2018; 19:ijms19041237. [PMID: 29671777 PMCID: PMC5979488 DOI: 10.3390/ijms19041237] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Revised: 04/15/2018] [Accepted: 04/17/2018] [Indexed: 02/06/2023] Open
Abstract
Recently, there have been a number of developments in the fields of calcium and nuclear signaling that point to new avenues for a more effective diagnosis and treatment of prostate cancer. An example is the discovery of new classes of molecules involved in calcium-regulated nuclear import and nuclear calcium signaling, from the G protein-coupled receptor (GPCR) and myosin families. This review surveys the new state of the calcium and nuclear signaling fields with the aim of identifying the unifying themes that hold out promise in the context of the problems presented by prostate cancer. Genomic perturbations, kinase cascades, developmental pathways, and channels and transporters are covered, with an emphasis on nuclear transport and functions. Special attention is paid to the molecular mechanisms behind prostate cancer progression to the malignant forms and the unfavorable response to anti-androgen treatment. The survey leads to some new hypotheses that connect heretofore disparate results and may present a translational interest.
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Liu X, Xue M. Noninvasive Prenatal Diagnosis Significance of ERG Methylation as a Biomarker in Down's Syndrome. Med Sci Monit 2017; 23:398-404. [PMID: 28111453 PMCID: PMC5282964 DOI: 10.12659/msm.898687] [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] [Indexed: 11/26/2022] Open
Abstract
Background Down’s syndrome (DS) is a genetic disease with chromosome abnormality due to the increasing chromosome 21. This study focused on the clinical application value of ERG methylation level in blood of pregnant women as a biomarker in Down’s syndrome. Material/Methods The sham group consisted of 210 nonpregnant women, the positive control group consisted of 33 women with a delivery history of DS fetus, and the negative control group consisted of 60 women with eutocia history. A combination of restriction enzyme digestion experiment and PCR was performed to examine ERG methylation levels, methylation sites, and distribution in blood of pregnant women and in chorion tissues from abortion samples. Gene sequencing was performed to determine the ERG sequence in chromosome 21. Homology between normal tissues and chorion tissues from abortion samples was analyzed with bioinformatics technology. Results ERG methylation in chorion tissues from 210 abortion samples at 8, 9, and 10 weeks gestational age were determined; however, no ERG methylation was determined in blood of pregnant women. Gene sequencing indicated that normal ERG sequence in chromosome 21 was in fetus chorion tissues, and these ERG sequences were aberrantly methylated. Bioinformatics result showed that homology and DNA methylation level was discrepancy in normal tissues and chorion tissues from abortion samples. Conclusions It was worthwhile to use ERG methylation as biomarker in noninvasive prenatal diagnosis, and ERG methylation should be applied with consent of pregnancy and her relatives.
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Affiliation(s)
- Xiangju Liu
- Genetics Diagnostic Lab, Tai'an Maternity and Child Care Hospital, Tai'an, Shandong, China (mainland)
| | - Ming Xue
- Genetics Diagnostic Lab, Tai'an Maternity and Child Care Hospital, Tai'an, Shandong, China (mainland)
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Rastogi A, Ali A, Tan SH, Banerjee S, Chen Y, Cullen J, Xavier CP, Mohamed AA, Ravindranath L, Srivastav J, Young D, Sesterhenn IA, Kagan J, Srivastava S, McLeod DG, Rosner IL, Petrovics G, Dobi A, Srivastava S, Srinivasan A. Autoantibodies against oncogenic ERG protein in prostate cancer: potential use in diagnosis and prognosis in a panel with C-MYC, AMACR and HERV-K Gag. Genes Cancer 2017; 7:394-413. [PMID: 28191285 PMCID: PMC5302040 DOI: 10.18632/genesandcancer.126] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Overdiagnosis and overtreatment of prostate cancer (CaP) is attributable to widespread reliance on PSA screening in the US. This has prompted us and others to search for improved biomarkers for CaP, to facilitate early detection and disease stratification. In this regard, autoantibodies (AAbs) against tumor antigens could serve as potential candidates for diagnosis and prognosis of CaP. Towards this, our goals were: i) To investigate whether AAbs against ERG oncoprotein (overexpressed in 25-50% of Caucasian American and African American CaP) are present in the sera of CaP patients; ii) To evaluate an AAb panel to enhance CaP detection. The results using an enzyme-linked immunosorbent assay (ELISA) showed that anti-ERG AAbs are present in a significantly higher proportion in the sera of CaP patients compared to healthy controls (p = 0.0001). Furthermore, a panel of AAbs against ERG, AMACR and human endogenous retrovirus-K Gag successfully differentiated CaP patient sera from healthy controls (AUC = 0.791). These results demonstrate for the first time that anti-ERG AAbs are present in the sera of CaP patients. In addition, the data also suggest that AAbs against ERG together with AMACR and HERV-K Gag may be a useful panel of biomarkers for diagnosis and prognosis of CaP.
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Affiliation(s)
- Anshu Rastogi
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University of the Health Sciences, Bethesda, MD, USA
| | - Amina Ali
- Urology Service, Department of Surgery, Walter Reed National Military Medical Center, Bethesda, MD, USA
| | - Shyh-Han Tan
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University of the Health Sciences, Bethesda, MD, USA
| | - Sreedatta Banerjee
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University of the Health Sciences, Bethesda, MD, USA
| | - Yongmei Chen
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University of the Health Sciences, Bethesda, MD, USA
| | - Jennifer Cullen
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University of the Health Sciences, Bethesda, MD, USA
| | - Charles P Xavier
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University of the Health Sciences, Bethesda, MD, USA
| | - Ahmed A Mohamed
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University of the Health Sciences, Bethesda, MD, USA
| | - Lakshmi Ravindranath
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University of the Health Sciences, Bethesda, MD, USA
| | - Jigisha Srivastav
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University of the Health Sciences, Bethesda, MD, USA
| | - Denise Young
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University of the Health Sciences, Bethesda, MD, USA
| | | | - Jacob Kagan
- Cancer Biomarkers Research Group, Division of Cancer Prevention, National Cancer Institute, Bethesda, MD, USA
| | - Sudhir Srivastava
- Cancer Biomarkers Research Group, Division of Cancer Prevention, National Cancer Institute, Bethesda, MD, USA
| | - David G McLeod
- Urology Service, Department of Surgery, Walter Reed National Military Medical Center, Bethesda, MD, USA
| | - Inger L Rosner
- Urology Service, Department of Surgery, Walter Reed National Military Medical Center, Bethesda, MD, USA
| | - Gyorgy Petrovics
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University of the Health Sciences, Bethesda, MD, USA
| | - Albert Dobi
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University of the Health Sciences, Bethesda, MD, USA
| | - Shiv Srivastava
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University of the Health Sciences, Bethesda, MD, USA
| | - Alagarsamy Srinivasan
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University of the Health Sciences, Bethesda, MD, USA
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Shah AV, Birdsey GM, Randi AM. Regulation of endothelial homeostasis, vascular development and angiogenesis by the transcription factor ERG. Vascul Pharmacol 2016; 86:3-13. [PMID: 27208692 PMCID: PMC5404112 DOI: 10.1016/j.vph.2016.05.003] [Citation(s) in RCA: 77] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2016] [Revised: 04/08/2016] [Accepted: 05/16/2016] [Indexed: 01/06/2023]
Abstract
Over the last few years, the ETS transcription factor ERG has emerged as a major regulator of endothelial function. Multiple studies have shown that ERG plays a crucial role in promoting angiogenesis and vascular stability during development and after birth. In the mature vasculature ERG also functions to maintain endothelial homeostasis, by transactivating genes involved in key endothelial functions, while repressing expression of pro-inflammatory genes. Its homeostatic role is lineage-specific, since ectopic expression of ERG in non-endothelial tissues such as prostate is detrimental and contributes to oncogenesis. This review summarises the main roles and pathways controlled by ERG in the vascular endothelium, its transcriptional targets and its functional partners and the emerging evidence on the pathways regulating ERG's activity and expression.
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Affiliation(s)
- Aarti V Shah
- Vascular Sciences, Imperial Centre for Translational and Experimental Medicine, National Heart and Lung Institute, Imperial College London, London, United Kingdom
| | - Graeme M Birdsey
- Vascular Sciences, Imperial Centre for Translational and Experimental Medicine, National Heart and Lung Institute, Imperial College London, London, United Kingdom
| | - Anna M Randi
- Vascular Sciences, Imperial Centre for Translational and Experimental Medicine, National Heart and Lung Institute, Imperial College London, London, United Kingdom.
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