1
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Mathew AR, Cavallucci V, Fidaleo M. Altered vitamin B12 metabolism in the central nervous system is associated with the modification of ribosomal gene expression: new insights from comparative RNA dataset analysis. Funct Integr Genomics 2023; 23:45. [PMID: 36683116 PMCID: PMC9868042 DOI: 10.1007/s10142-023-00969-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Revised: 01/05/2023] [Accepted: 01/06/2023] [Indexed: 01/24/2023]
Abstract
Recent studies have confirmed the direct role of vitamin B12 (VitB12) in the central nervous system (CNS) homeostasis; nevertheless, the detailed mechanisms are poorly understood. By analyzing RNA-Seq and microarray datasets obtained from databanks, this study aims to identify possible basic mechanisms, related to the brain, involved in altering the gene expression under VitB12 deficiency mimicking conditions. The database inquiry returned datasets generated from distinctly heterogeneous experimental sets and considering the quality and relevance requirements, two datasets from mouse and one from rat models were selected. The analyses of individual datasets highlighted a change in ribosomal gene expression in VitB12 deficiency mimicking conditions within each system. Specifically, a divergent regulation was observed depending on the animal model: mice showed a down regulation of the ribosomal gene expression, while rats an upregulation. Interestingly, E2f1 was significantly upregulated under VitB12 deficiency mimicking conditions in the animal models, with a greater upregulation in rats. The rat model also revealed putative E2F1 Transcription Factor Binding Sites (TFBSs) in the promoter of the differently regulated genes involved in ribosomal gene expression. This suggested the possibility that E2F1, being greater expressed in rats, could activate the ribosomal genes having E2F1 TFBSs, thus giving a plausible explication to the divergent regulation observed in animal models. Despite the great diversity of the experimental sets used to generate the datasets considered, a common alteration of the ribosomes exists, thereby indicating a possible basic and conserved response to VitB12 deficiency. Moreover, these findings could provide new insights on E2F1 and its association with CNS homeostasis and VitB12 deficiency.
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Affiliation(s)
- Aimee Rachel Mathew
- Department of Biology and Biotechnology Charles Darwin, University of Rome Sapienza, 00185, Rome, Italy
| | - Virve Cavallucci
- Fondazione Policlinico Universitario A. Gemelli IRCCS, 00168, Rome, Italy.,Institute of General Pathology, Università Cattolica del Sacro Cuore, 00168, Rome, Italy
| | - Marco Fidaleo
- Department of Biology and Biotechnology Charles Darwin, University of Rome Sapienza, 00185, Rome, Italy. .,Research Center for Nanotechnology for Engineering of Sapienza (CNIS), University of Rome Sapienza, 00185, Rome, Italy.
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2
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Vershinin Z, Feldman M, Werner T, Weil LE, Kublanovsky M, Abaev-Schneiderman E, Sklarz M, Lam EYN, Alasad K, Picaud S, Rotblat B, McAdam RA, Chalifa-Caspi V, Bantscheff M, Chapman T, Lewis HD, Filippakopoulos P, Dawson MA, Grandi P, Prinjha RK, Levy D. BRD4 methylation by the methyltransferase SETD6 regulates selective transcription to control mRNA translation. SCIENCE ADVANCES 2021; 7:7/22/eabf5374. [PMID: 34039605 PMCID: PMC8153730 DOI: 10.1126/sciadv.abf5374] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Accepted: 04/06/2021] [Indexed: 05/14/2023]
Abstract
The transcriptional coactivator BRD4 has a fundamental role in transcription regulation and thus became a promising epigenetic therapeutic candidate to target diverse pathologies. However, the regulation of BRD4 by posttranslational modifications has been largely unexplored. Here, we show that BRD4 is methylated on chromatin at lysine-99 by the protein lysine methyltransferase SETD6. BRD4 methylation negatively regulates the expression of genes that are involved in translation and inhibits total mRNA translation in cells. Mechanistically, we provide evidence that supports a model where BRD4 methylation by SETD6 does not have a direct role in the association with acetylated histone H4 at chromatin. However, this methylation specifically determines the recruitment of the transcription factor E2F1 to selected target genes that are involved in mRNA translation. Together, our findings reveal a previously unknown molecular mechanism for BRD4 methylation-dependent gene-specific targeting, which may serve as a new direction for the development of therapeutic applications.
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Affiliation(s)
- Zlata Vershinin
- The Shraga Segal Department of Microbiology, Immunology and Genetics, Ben-Gurion University of the Negev, P.O.B. 653, Be'er-Sheva 84105, Israel
- National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, P.O.B. 653, Be'er-Sheva 84105, Israel
| | - Michal Feldman
- The Shraga Segal Department of Microbiology, Immunology and Genetics, Ben-Gurion University of the Negev, P.O.B. 653, Be'er-Sheva 84105, Israel
- National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, P.O.B. 653, Be'er-Sheva 84105, Israel
| | - Thilo Werner
- GSK Cellzome GmbH, Functional Genomics R&D, 69117 Heidelberg, Germany
| | - Lital Estrella Weil
- The Shraga Segal Department of Microbiology, Immunology and Genetics, Ben-Gurion University of the Negev, P.O.B. 653, Be'er-Sheva 84105, Israel
- National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, P.O.B. 653, Be'er-Sheva 84105, Israel
| | - Margarita Kublanovsky
- The Shraga Segal Department of Microbiology, Immunology and Genetics, Ben-Gurion University of the Negev, P.O.B. 653, Be'er-Sheva 84105, Israel
- National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, P.O.B. 653, Be'er-Sheva 84105, Israel
| | - Elina Abaev-Schneiderman
- The Shraga Segal Department of Microbiology, Immunology and Genetics, Ben-Gurion University of the Negev, P.O.B. 653, Be'er-Sheva 84105, Israel
- National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, P.O.B. 653, Be'er-Sheva 84105, Israel
| | - Menachem Sklarz
- National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, P.O.B. 653, Be'er-Sheva 84105, Israel
| | - Enid Y N Lam
- Sir Peter MacCallum Department of Oncology and Centre for Cancer Research, University of Melbourne, Melbourne, Australia
| | - Khawla Alasad
- National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, P.O.B. 653, Be'er-Sheva 84105, Israel
- Department of Life Sciences, Ben-Gurion University of the Negev, Be'er-Sheva 84105, Israel
| | - Sarah Picaud
- Structural Genomics Consortium, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, UK
| | - Barak Rotblat
- National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, P.O.B. 653, Be'er-Sheva 84105, Israel
- Department of Life Sciences, Ben-Gurion University of the Negev, Be'er-Sheva 84105, Israel
| | - Ruth A McAdam
- GSK, Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, UK
| | - Vered Chalifa-Caspi
- National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, P.O.B. 653, Be'er-Sheva 84105, Israel
| | - Marcus Bantscheff
- GSK Cellzome GmbH, Functional Genomics R&D, 69117 Heidelberg, Germany
| | - Trevor Chapman
- GSK, Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, UK
| | - Huw D Lewis
- GSK, Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, UK
| | - Panagis Filippakopoulos
- Structural Genomics Consortium, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, UK
| | - Mark A Dawson
- Sir Peter MacCallum Department of Oncology and Centre for Cancer Research, University of Melbourne, Melbourne, Australia
| | - Paola Grandi
- GSK Cellzome GmbH, Functional Genomics R&D, 69117 Heidelberg, Germany
| | - Rab K Prinjha
- GSK, Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, UK
| | - Dan Levy
- The Shraga Segal Department of Microbiology, Immunology and Genetics, Ben-Gurion University of the Negev, P.O.B. 653, Be'er-Sheva 84105, Israel.
- National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, P.O.B. 653, Be'er-Sheva 84105, Israel
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3
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Daubon T, Léon C, Clarke K, Andrique L, Salabert L, Darbo E, Pineau R, Guérit S, Maitre M, Dedieu S, Jeanne A, Bailly S, Feige JJ, Miletic H, Rossi M, Bello L, Falciani F, Bjerkvig R, Bikfalvi A. Deciphering the complex role of thrombospondin-1 in glioblastoma development. Nat Commun 2019; 10:1146. [PMID: 30850588 PMCID: PMC6408502 DOI: 10.1038/s41467-019-08480-y] [Citation(s) in RCA: 117] [Impact Index Per Article: 23.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2017] [Accepted: 01/09/2019] [Indexed: 12/17/2022] Open
Abstract
We undertook a systematic study focused on the matricellular protein Thrombospondin-1 (THBS1) to uncover molecular mechanisms underlying the role of THBS1 in glioblastoma (GBM) development. THBS1 was found to be increased with glioma grades. Mechanistically, we show that the TGFβ canonical pathway transcriptionally regulates THBS1, through SMAD3 binding to the THBS1 gene promoter. THBS1 silencing inhibits tumour cell invasion and growth, alone and in combination with anti-angiogenic therapy. Specific inhibition of the THBS1/CD47 interaction using an antagonist peptide decreases cell invasion. This is confirmed by CD47 knock-down experiments. RNA sequencing of patient-derived xenograft tissue from laser capture micro-dissected peripheral and central tumour areas demonstrates that THBS1 is one of the gene with the highest connectivity at the tumour borders. All in all, these data show that TGFβ1 induces THBS1 expression via Smad3 which contributes to the invasive behaviour during GBM expansion. Furthermore, tumour cell-bound CD47 is implicated in this process. Thrombospondin-1 (THSB1) is a component of the ECM with a role in regulating cancer development and tumour vasculature. Here, the authors show that TGF-beta-induced THBS1 expression contributes to the invasive behaviour of GBM cells and promotes resistance to antiangiogenic therapy partially through interaction with CD47.
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Affiliation(s)
- Thomas Daubon
- INSERM U1029, Institut Nationale de la Santé et de la Recherche Médicale, 33615, Pessac, France. .,University Bordeaux, 33615, Pessac, France. .,KG Jebsen Brain Tumor Research Center, University of Bergen, 5020, Bergen, Norway. .,Norlux Beuro-Oncology, Department of Biomedicine, University of Bergen, 5020, Bergen, Norway.
| | - Céline Léon
- INSERM U1029, Institut Nationale de la Santé et de la Recherche Médicale, 33615, Pessac, France.,University Bordeaux, 33615, Pessac, France
| | - Kim Clarke
- Computational Biology Facility, University of Liverpool, Liverpool, L69 7ZB, UK
| | - Laetitia Andrique
- INSERM U1029, Institut Nationale de la Santé et de la Recherche Médicale, 33615, Pessac, France.,University Bordeaux, 33615, Pessac, France
| | - Laura Salabert
- INSERM U1029, Institut Nationale de la Santé et de la Recherche Médicale, 33615, Pessac, France.,University Bordeaux, 33615, Pessac, France
| | - Elodie Darbo
- UMR1218 ACTION, Bioinformatic Center CBiB, University of Bordeaux, 33076, Bordeaux, France
| | - Raphael Pineau
- Animal Facility, University Bordeaux, 33615, Pessac, France
| | - Sylvaine Guérit
- INSERM U1029, Institut Nationale de la Santé et de la Recherche Médicale, 33615, Pessac, France.,University Bordeaux, 33615, Pessac, France
| | - Marlène Maitre
- INSERM U1215, Neurocenter Magendie, Pathophysiology of Addiction Group, 33076, Bordeaux, France
| | | | - Albin Jeanne
- CNRS UMR 7369, MEDyC, 51687, Reims, France.,SATT Nord, 59800, Lille, France
| | | | | | - Hrvoje Miletic
- KG Jebsen Brain Tumor Research Center, University of Bergen, 5020, Bergen, Norway.,Department of Pathology, Haukeland University Hospital, 5020, Bergen, Norway
| | - Marco Rossi
- Neurosurgical Oncology Unit, Department of Oncology and Hemato-Oncology, Humanitas Research Hospital, Universita Degli Studi di Milano, 20089, Rozzano, Milan, Italy
| | - Lorenzo Bello
- Neurosurgical Oncology Unit, Department of Oncology and Hemato-Oncology, Humanitas Research Hospital, Universita Degli Studi di Milano, 20089, Rozzano, Milan, Italy
| | - Francesco Falciani
- Computational Biology Facility, University of Liverpool, Liverpool, L69 7ZB, UK
| | - Rolf Bjerkvig
- KG Jebsen Brain Tumor Research Center, University of Bergen, 5020, Bergen, Norway.,Norlux Beuro-Oncology, Department of Biomedicine, University of Bergen, 5020, Bergen, Norway.,Oncology Department, Luxembourg Institute of Health, 84, Val Fleuri, 1526, Luxembourg
| | - Andréas Bikfalvi
- INSERM U1029, Institut Nationale de la Santé et de la Recherche Médicale, 33615, Pessac, France. .,University Bordeaux, 33615, Pessac, France.
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4
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Coutts AS, Munro S, La Thangue NB. Functional interplay between E2F7 and ribosomal rRNA gene transcription regulates protein synthesis. Cell Death Dis 2018; 9:577. [PMID: 29760477 PMCID: PMC5951837 DOI: 10.1038/s41419-018-0529-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Revised: 03/21/2018] [Accepted: 03/23/2018] [Indexed: 01/02/2023]
Abstract
A prerequisite for protein synthesis is the transcription of ribosomal rRNA genes by RNA polymerase I (Pol I), which controls ribosome biogenesis. UBF (upstream binding factor) is one of the main Pol I transcription factors located in the nucleolus that activates rRNA gene transcription. E2F7 is an atypical E2F family member that acts as a transcriptional repressor of E2F target genes, and thereby contributes to cell cycle arrest. Here, we describe an unexpected role for E2F7 in regulating rRNA gene transcription. We have found that E2F7 localises to the perinucleolar region, and further that E2F7 is able to exert repressive effects on Pol I transcription. At the mechanistic level, this is achieved in part by E2F7 hindering UBF recruitment to the rRNA gene promoter region, and thereby reducing rRNA gene transcription, which in turn compromises global protein synthesis. Our results expand the target gene repertoire influenced by E2F7 to include Pol I-regulated genes, and more generally suggest a mechanism mediated by effects on Pol I transcription where E2F7 links cell cycle arrest with protein synthesis.
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Affiliation(s)
- Amanda S Coutts
- Laboratory of Cancer Biology, Department of Oncology, Medical Sciences Division, University of Oxford, Old Road Campus Research Building, Old Road Campus, Off Roosevelt Drive, Oxford, OX3 7DQ, UK.
- College of Science and Technology, Nottingham Trent University, Clifton Lane, Nottingham, NG11 8NS, UK.
| | - Shonagh Munro
- Laboratory of Cancer Biology, Department of Oncology, Medical Sciences Division, University of Oxford, Old Road Campus Research Building, Old Road Campus, Off Roosevelt Drive, Oxford, OX3 7DQ, UK
| | - Nicholas B La Thangue
- Laboratory of Cancer Biology, Department of Oncology, Medical Sciences Division, University of Oxford, Old Road Campus Research Building, Old Road Campus, Off Roosevelt Drive, Oxford, OX3 7DQ, UK.
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5
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Huang S, Xu X, Wang G, Lu G, Xie W, Tao W, Zhang H, Jiang Q, Zhang C. DNA replication initiator Cdc6 also regulates ribosomal DNA transcription initiation. J Cell Sci 2016; 129:1429-40. [PMID: 26872786 DOI: 10.1242/jcs.178723] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Accepted: 02/06/2016] [Indexed: 01/28/2023] Open
Abstract
RNA-polymerase-I-dependent ribosomal DNA (rDNA) transcription is fundamental to rRNA processing, ribosome assembly and protein synthesis. However, how this process is initiated during the cell cycle is not fully understood. By performing a proteomic analysis of transcription factors that bind RNA polymerase I during rDNA transcription initiation, we identified that the DNA replication initiator Cdc6 interacts with RNA polymerase I and its co-factors, and promotes rDNA transcription in G1 phase in an ATPase-activity-dependent manner. We further showed that Cdc6 is targeted to the nucleolus during late mitosis and G1 phase in a manner that is dependent on B23 (also known as nucleophosmin, NPM1), and preferentially binds to the rDNA promoter through its ATP-binding domain. Overexpression of Cdc6 increases rDNA transcription, whereas knockdown of Cdc6 results in a decreased association of both RNA polymerase I and the RNA polymerase I transcription factor RRN3 with rDNA, and a reduction of rDNA transcription. Furthermore, depletion of Cdc6 impairs the interaction between RRN3 and RNA polymerase I. Taken together, our data demonstrate that Cdc6 also serves as a regulator of rDNA transcription initiation, and indicate a mechanism by which initiation of rDNA transcription and DNA replication can be coordinated in cells.
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Affiliation(s)
- Shijiao Huang
- The MOE Key Laboratory of Cell Proliferation and Differentiation and the State Key Laboratory of Membrane Biology, College of Life Sciences, Peking University, Beijing 100871, China
| | - Xiaowei Xu
- The MOE Key Laboratory of Cell Proliferation and Differentiation and the State Key Laboratory of Membrane Biology, College of Life Sciences, Peking University, Beijing 100871, China
| | - Guopeng Wang
- The MOE Key Laboratory of Cell Proliferation and Differentiation and the State Key Laboratory of Membrane Biology, College of Life Sciences, Peking University, Beijing 100871, China
| | - Guoliang Lu
- The MOE Key Laboratory of Cell Proliferation and Differentiation and the State Key Laboratory of Membrane Biology, College of Life Sciences, Peking University, Beijing 100871, China
| | - Wenbing Xie
- The MOE Key Laboratory of Cell Proliferation and Differentiation and the State Key Laboratory of Membrane Biology, College of Life Sciences, Peking University, Beijing 100871, China
| | - Wei Tao
- The MOE Key Laboratory of Cell Proliferation and Differentiation and the State Key Laboratory of Membrane Biology, College of Life Sciences, Peking University, Beijing 100871, China
| | - Hongyin Zhang
- Cancer Research Center, Peking University Hospital, Peking University, Beijing 100871, China
| | - Qing Jiang
- The MOE Key Laboratory of Cell Proliferation and Differentiation and the State Key Laboratory of Membrane Biology, College of Life Sciences, Peking University, Beijing 100871, China
| | - Chuanmao Zhang
- The MOE Key Laboratory of Cell Proliferation and Differentiation and the State Key Laboratory of Membrane Biology, College of Life Sciences, Peking University, Beijing 100871, China
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6
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Dichamp I, Séité P, Agius G, Barbarin A, Beby-Defaux A. Human papillomavirus 16 oncoprotein E7 stimulates UBF1-mediated rDNA gene transcription, inhibiting a p53-independent activity of p14ARF. PLoS One 2014; 9:e96136. [PMID: 24798431 PMCID: PMC4010441 DOI: 10.1371/journal.pone.0096136] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2012] [Accepted: 04/03/2014] [Indexed: 11/18/2022] Open
Abstract
High-risk human papillomavirus oncoproteins E6 and E7 play a major role in HPV-related cancers. One of the main functions of E7 is the degradation of pRb, while E6 promotes the degradation of p53, inactivating the p14ARF-p53 pathway. pRb and p14ARF can repress ribosomal DNA (rDNA) transcription in part by targeting the Upstream Binding Factor 1 (UBF1), a key factor in the activation of RNA polymerase I machinery. We showed, through ectopic expression and siRNA silencing of p14ARF and/or E7, that E7 stimulates UBF1-mediated rDNA gene transcription, partly because of increased levels of phosphorylated UBF1, preventing the inhibitory function of p14ARF. Unexpectedly, activation of rDNA gene transcription was higher in cells co-expressing p14ARF and E7, compared to cells expressing E7 alone. We did not find a difference in P-UBF1 levels that could explain this data. However, p14ARF expression induced E7 to accumulate into the nucleolus, where rDNA transcription takes place, providing an opportunity for E7 to interact with nucleolar proteins involved in this process. GST-pull down and co-immunoprecipitation assays showed interactions between p14ARF, UBF1 and E7, although p14ARF and E7 are not able to directly interact. Co-expression of a pRb-binding-deficient mutant (E7C24G) and p14ARF resulted in EC24G nucleolar accumulation, but not in a significant higher activation of rDNA transcription, suggesting that the inactivation of pRb is involved in this phenomenon. Thus, p14ARF fails to prevent E7-mediated UBF1 phosphorylation, but could facilitate nucleolar pRb inactivation by targeting E7 to the nucleolus. While others have reported that p19ARF, the mouse homologue of p14ARF, inhibits some functions of E7, we showed that E7 inhibits a p53-independent function of p14ARF. These results point to a mutually functional interaction between p14ARF and E7 that might partly explain why the sustained p14ARF expression observed in most cervical pre-malignant lesions and malignancies may be ineffective.
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Affiliation(s)
- Isabelle Dichamp
- Unité de Virologie, Centre Hospitalier Universitaire de Poitiers, Faculté de Médecine et Pharmacie, Poitiers, France
| | - Paule Séité
- Equipe Emergente 2RCT «Récepteurs, Régulations, Cellules Tumorales», Université de Poitiers, Poitiers, France
| | - Gérard Agius
- Unité de Virologie, Centre Hospitalier Universitaire de Poitiers, Faculté de Médecine et Pharmacie, Poitiers, France
| | - Alice Barbarin
- Equipe Emergente 2RCT «Récepteurs, Régulations, Cellules Tumorales», Université de Poitiers, Poitiers, France
| | - Agnès Beby-Defaux
- Unité de Virologie, Centre Hospitalier Universitaire de Poitiers, Faculté de Médecine et Pharmacie, Poitiers, France
- Equipe Emergente 2RCT «Récepteurs, Régulations, Cellules Tumorales», Université de Poitiers, Poitiers, France
- * E-mail:
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7
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Golomb L, Volarevic S, Oren M. p53 and ribosome biogenesis stress: the essentials. FEBS Lett 2014; 588:2571-9. [PMID: 24747423 DOI: 10.1016/j.febslet.2014.04.014] [Citation(s) in RCA: 160] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2014] [Revised: 04/04/2014] [Accepted: 04/04/2014] [Indexed: 12/18/2022]
Abstract
Cell proliferation and cell growth are two tightly linked processes, as the proliferation program cannot be executed without proper accumulation of cell mass, otherwise endangering the fate of the two daughter cells. It is therefore not surprising that ribosome biogenesis, a key element in cell growth, is regulated by many cell cycle regulators. This regulation is exerted transcriptionally and post-transcriptionally, in conjunction with numerous intrinsic and extrinsic signals. Those signals eventually converge at the nucleolus, the cellular compartment that is not only responsible for executing the ribosome biogenesis program, but also serves as a regulatory hub, responsible for integrating and transmitting multiple stress signals to the omnipotent cell fate gatekeeper, p53. In this review we discuss when, how and why p53 is activated upon ribosomal biogenesis stress, and how perturbation of this critical regulatory interplay may impact human disease.
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Affiliation(s)
- Lior Golomb
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Sinisa Volarevic
- Department of Molecular Medicine and Biotechnology, School of Medicine, University of Rijeka, Croatia
| | - Moshe Oren
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel.
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8
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Jin YQ, An GS, Ni JH, Li SY, Jia HT. ATM-dependent E2F1 accumulation in the nucleolus is an indicator of ribosomal stress in early response to DNA damage. Cell Cycle 2014; 13:1627-38. [PMID: 24675884 DOI: 10.4161/cc.28605] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
The nucleolus plays a major role in ribosome biogenesis. Most genotoxic agents disrupt nucleolar structure and function, which results in the stabilization/activation of p53, inducing cell cycle arrest or apoptosis. Likewise, transcription factor E2F1 as a DNA damage responsive protein also plays roles in cell cycle arrest, DNA repair, or apoptosis in response to DNA damage through transcriptional response and protein-protein interaction. Furthermore, E2F1 is known to be involved in regulating rRNA transcription. However, how E2F1 displays in coordinating DNA damage and nucleolar stress is unclear. In this study, we demonstrate that ATM-dependent E2F1 accumulation in the nucleolus is a characteristic feature of nucleolar stress in early response to DNA damage. We found that at the early stage of DNA damage, E2F1 accumulation in the nucleolus was an ATM-dependent and a common event in p53-suficient and -deficient cells. Increased nucleolar E2F1 was sequestered by the nucleolar protein p14ARF, which repressed E2F1-dependent rRNA transcription initiation, and was coupled with S phase. Our data indicate that early accumulation of E2F1 in the nucleolus is an indicator for nucleolar stress and a component of ATM pathway, which presumably buffers elevation of E2F1 in the nucleoplasm and coordinates the diversifying mechanisms of E2F1 acts in cell cycle progression and apoptosis in early response to DNA damage.
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Affiliation(s)
- Ya-Qiong Jin
- Department of Biochemistry and Molecular Biology; Peking University Health Science Center; Beijing, PR China
| | - Guo-Shun An
- Department of Biochemistry and Molecular Biology; Peking University Health Science Center; Beijing, PR China
| | - Ju-Hua Ni
- Department of Biochemistry and Molecular Biology; Peking University Health Science Center; Beijing, PR China
| | - Shu-Yan Li
- Department of Biochemistry and Molecular Biology; Peking University Health Science Center; Beijing, PR China
| | - Hong-Ti Jia
- Department of Biochemistry and Molecular Biology; Peking University Health Science Center; Beijing, PR China; Department of Biochemistry and Molecular Biology; Capital Medical University; Beijing, PR China
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9
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Andrique L, Fauvin D, El Maassarani M, Colasson H, Vannier B, Séité P. ErbB380kDa, a nuclear variant of the ErbB3 receptor, binds to the Cyclin D1 promoter to activate cell proliferation but is negatively controlled by p14ARF. Cell Signal 2012; 24:1074-85. [DOI: 10.1016/j.cellsig.2012.01.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2011] [Revised: 12/16/2011] [Accepted: 01/04/2012] [Indexed: 01/11/2023]
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10
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Abstract
The dynamic processes of cell growth and division are under constant surveillance. As one of the primary “gatekeepers” of the cell, the p53 tumor suppressor plays a major role in sensing and responding to a variety of stressors to maintain cellular homeostasis. Recent studies have shown that inhibition of ribosomal biogenesis can activate p53 through ribosomal protein (RP)-mediated suppression of Mdm2 E3 ligase activity. Mutations in Mdm2 that disrupt RP binding have been detected in human cancers; however, the physiological significance of the RP-Mdm2 interaction is not completely understood. We generated mice carrying a single cysteine-to-phenylalanine substitution in the central zinc finger of Mdm2 (Mdm2C305F) that disrupts Mdm2’s binding to RPL11 and RPL5. Despite being developmentally normal and maintaining an intact p53 response to DNA damage, the Mdm2C305F mice demonstrate a diminished p53 response to perturbations in ribosomal biogenesis, providing the first in vivo evidence for an RP-Mdm2-p53 signaling pathway. Here we review some recent studies about RP-Mdm2-p53 signaling and speculate on the relevance of this pathway to human cancer.
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Affiliation(s)
- Paula L Miliani de Marval
- Department of Radiation Oncology, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
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Pan W, Issaq S, Zhang Y. The in vivo role of the RP-Mdm2-p53 pathway in signaling oncogenic stress induced by pRb inactivation and Ras overexpression. PLoS One 2011; 6:e21625. [PMID: 21747916 PMCID: PMC3126829 DOI: 10.1371/journal.pone.0021625] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2011] [Accepted: 06/03/2011] [Indexed: 01/28/2023] Open
Abstract
The Mdm2-p53 tumor suppression pathway plays a vital role in regulating cellular homeostasis by integrating a variety of stressors and eliciting effects on cell growth and proliferation. Recent studies have demonstrated an in vivo signaling pathway mediated by ribosomal protein (RP)-Mdm2 interaction that responds to ribosome biogenesis stress and evokes a protective p53 reaction. It has been shown that mice harboring a Cys-to-Phe mutation in the zinc finger of Mdm2 that specifically disrupts RP L11-Mdm2 binding are prone to accelerated lymphomagenesis in an oncogenic c-Myc driven mouse model of Burkitt's lymphoma. Because most oncogenes when upregulated simultaneously promote both cellular growth and proliferation, it therefore stands to reason that the RP-Mdm2-p53 pathway might also be essential in response to oncogenes other than c-Myc. Using genetically engineered mice, we now show that disruption of the RP-Mdm2-p53 pathway by an Mdm2(C305F) mutation does not accelerate prostatic tumorigenesis induced by inactivation of the pRb family proteins (pRb/p107/p130). In contrast, loss of p19Arf greatly accelerates the progression of prostate cancer induced by inhibition of pRb family proteins. Moreover, using ectopically expressed oncogenic H-Ras we demonstrate that p53 response remains intact in the Mdm2(C305F) mutant MEF cells. Thus, unlike the p19Arf-Mdm2-p53 pathway, which is considered a general oncogenic response pathway, the RP-Mdm2-p53 pathway appears to specifically suppress tumorigenesis induced by oncogenic c-Myc.
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Affiliation(s)
- Wenqi Pan
- Department of Radiation Oncology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
- Curriculum in Genetics and Molecular Biology, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
| | - Sameer Issaq
- Department of Radiation Oncology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
| | - Yanping Zhang
- Department of Radiation Oncology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
- Department of Pharmacology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
- * E-mail:
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Macias E, Jin A, Deisenroth C, Bhat K, Mao H, Lindström MS, Zhang Y. An ARF-independent c-MYC-activated tumor suppression pathway mediated by ribosomal protein-Mdm2 Interaction. Cancer Cell 2010; 18:231-43. [PMID: 20832751 PMCID: PMC4400806 DOI: 10.1016/j.ccr.2010.08.007] [Citation(s) in RCA: 166] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2010] [Revised: 05/24/2010] [Accepted: 07/13/2010] [Indexed: 01/10/2023]
Abstract
In vitro studies have shown that inhibition of ribosomal biogenesis can activate p53 through ribosomal protein (RP)-mediated suppression of Mdm2 E3 ligase activity. To study the physiological significance of the RP-Mdm2 interaction, we generated mice carrying a cancer-associated cysteine-to-phenylalanine substitution in the zinc finger of Mdm2 that disrupted its binding to RPL5 and RPL11. Mice harboring this mutation, retain normal p53 response to DNA damage, but lack of p53 response to perturbations in ribosome biogenesis. Loss of RP-Mdm2 interaction significantly accelerates Eμ-Myc-induced lymphomagenesis. Furthermore, ribosomal perturbation-induced p53 response does not require tumor suppressor p19ARF. Collectively, our findings establish RP-Mdm2 interaction as a genuine p53 stress-signaling pathway activated by aberrant ribosome biogenesis and essential for safeguarding against oncogenic c-MYC-induced tumorigenesis.
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Affiliation(s)
- Everardo Macias
- Department of Radiation Oncology, School of Medicine, the University of North Carolina at Chapel Hill, Chapel Hill, NC.
- Lineberger Comprehensive Cancer Center, School of Medicine, the University of North Carolina at Chapel Hill, Chapel Hill, NC.
| | - Aiwen Jin
- Department of Radiation Oncology, School of Medicine, the University of North Carolina at Chapel Hill, Chapel Hill, NC.
- Lineberger Comprehensive Cancer Center, School of Medicine, the University of North Carolina at Chapel Hill, Chapel Hill, NC.
| | - Chad Deisenroth
- Department of Radiation Oncology, School of Medicine, the University of North Carolina at Chapel Hill, Chapel Hill, NC.
- Lineberger Comprehensive Cancer Center, School of Medicine, the University of North Carolina at Chapel Hill, Chapel Hill, NC.
- Curriculum in Genetics and Molecular Biology, School of Medicine, the University of North Carolina at Chapel Hill, Chapel Hill, NC.
| | - Krishna Bhat
- Departments of Pathology, The University of Texas, M.D. Anderson Cancer Center, Houston, Texas.
| | - Hua Mao
- Department of Pharmacology, School of Medicine, the University of North Carolina at Chapel Hill, Chapel Hill, NC.
| | | | - Yanping Zhang
- Department of Radiation Oncology, School of Medicine, the University of North Carolina at Chapel Hill, Chapel Hill, NC.
- Lineberger Comprehensive Cancer Center, School of Medicine, the University of North Carolina at Chapel Hill, Chapel Hill, NC.
- Department of Pharmacology, School of Medicine, the University of North Carolina at Chapel Hill, Chapel Hill, NC.
- To whom correspondence should be addressed: University of North Carolina at Chapel Hill, Department of Radiation Oncology, Chapel Hill, NC 27599-7512 Tel.: 919-966-7713, Fax.: 919-966-7681,
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Paik JC, Wang B, Liu K, Lue JK, Lin WC. Regulation of E2F1-induced apoptosis by the nucleolar protein RRP1B. J Biol Chem 2009; 285:6348-63. [PMID: 20040599 DOI: 10.1074/jbc.m109.072074] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Regulation of the E2F family of transcription factors is important in control of cellular proliferation; dysregulation of the E2Fs is a hallmark of many cancers. One member of the E2F family, E2F1, also has the paradoxical ability to induce apoptosis; however, the mechanisms underlying this selectivity are not fully understood. We now identify a nucleolar protein, RRP1B, as an E2F1-specific transcriptional target. We characterize the RRP1B promoter and demonstrate its selective response to E2F1. Consistent with the activation of E2F1 activity upon DNA damage, RRP1B is induced by several DNA-damaging agents. Importantly, RRP1B is required for the expression of certain E2F1 proapoptotic target genes and the induction of apoptosis by DNA-damaging agents. This activity is mediated in part by complex formation between RRP1B and E2F1 on selective E2F1 target gene promoters. Interaction between RRP1B and E2F1 can be found inside the nucleolus and diffuse nucleoplasmic punctates. Thus, E2F1 makes use of its transcriptional target RRP1B to activate other genes directly involved in apoptosis. Our data also suggest an underappreciated role for nucleolar proteins in transcriptional regulation.
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Affiliation(s)
- Jason C Paik
- Division of Hematology/Oncology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama 35294, USA
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Shiao YH, Lupascu ST, Gu YD, Kasprzak W, Hwang CJ, Fields JR, Leighty RM, Quiñones O, Shapiro BA, Alvord WG, Anderson LM. An intergenic non-coding rRNA correlated with expression of the rRNA and frequency of an rRNA single nucleotide polymorphism in lung cancer cells. PLoS One 2009; 4:e7505. [PMID: 19838300 PMCID: PMC2759515 DOI: 10.1371/journal.pone.0007505] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2009] [Accepted: 09/30/2009] [Indexed: 02/04/2023] Open
Abstract
Background Ribosomal RNA (rRNA) is a central regulator of cell growth and may control cancer development. A cis noncoding rRNA (nc-rRNA) upstream from the 45S rRNA transcription start site has recently been implicated in control of rRNA transcription in mouse fibroblasts. We investigated whether a similar nc-rRNA might be expressed in human cancer epithelial cells, and related to any genomic characteristics. Methodology/Principal Findings Using quantitative rRNA measurement, we demonstrated that a nc-rRNA is transcribed in human lung epithelial and lung cancer cells, starting from approximately −1000 nucleotides upstream of the rRNA transcription start site (+1) and extending at least to +203. This nc-rRNA was significantly more abundant in the majority of lung cancer cell lines, relative to a nontransformed lung epithelial cell line. Its abundance correlated negatively with total 45S rRNA in 12 of 13 cell lines (P = 0.014). During sequence analysis from −388 to +306, we observed diverse, frequent intercopy single nucleotide polymorphisms (SNPs) in rRNA, with a frequency greater than predicted by chance at 12 sites. A SNP at +139 (U/C) in the 5′ leader sequence varied among the cell lines and correlated negatively with level of the nc-rRNA (P = 0.014). Modelling of the secondary structure of the rRNA 5′-leader sequence indicated a small increase in structural stability due to the +139 U/C SNP and a minor shift in local configuration occurrences. Conclusions/Significance The results demonstrate occurrence of a sense nc-rRNA in human lung epithelial and cancer cells, and imply a role in regulation of the rRNA gene, which may be affected by a +139 SNP in the 5′ leader sequence of the primary rRNA transcript.
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Affiliation(s)
- Yih-Horng Shiao
- Laboratory of Comparative Carcinogenesis, National Cancer Institute at Frederick, Frederick, Maryland, USA.
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