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Ng YB, Akincilar SC. Shaping DNA damage responses: Therapeutic potential of targeting telomeric proteins and DNA repair factors in cancer. Curr Opin Pharmacol 2024; 76:102460. [PMID: 38776747 DOI: 10.1016/j.coph.2024.102460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2022] [Revised: 10/06/2023] [Accepted: 10/11/2023] [Indexed: 05/25/2024]
Abstract
Shelterin proteins regulate genomic stability by preventing inappropriate DNA damage responses (DDRs) at telomeres. Unprotected telomeres lead to persistent DDR causing cell cycle inhibition, growth arrest, and apoptosis. Cancer cells rely on DDR to protect themselves from DNA lesions and exogenous DNA-damaging agents such as chemotherapy and radiotherapy. Therefore, targeting DDR machinery is a promising strategy to increase the sensitivity of cancer cells to existing cancer therapies. However, the success of these DDR inhibitors depends on other mutations, and over time, patients develop resistance to these therapies. This suggests the need for alternative approaches. One promising strategy is co-inhibiting shelterin proteins with DDR molecules, which would offset cellular fitness in DNA repair in a mutation-independent manner. This review highlights the associations and dependencies of the shelterin complex with the DDR proteins and discusses potential co-inhibition strategies that might improve the therapeutic potential of current inhibitors.
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Affiliation(s)
- Yu Bin Ng
- Laboratory of NFκB Signalling, Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A∗STAR), 61 Biopolis Drive, Proteos, Singapore 138673, Republic of Singapore
| | - Semih Can Akincilar
- Laboratory of NFκB Signalling, Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A∗STAR), 61 Biopolis Drive, Proteos, Singapore 138673, Republic of Singapore.
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De Silva WGM, Sequeira VB, Yang C, Dixon KM, Holland AJA, Mason RS, Rybchyn MS. 1,25-Dihydroxyvitamin D 3 Suppresses UV-Induced Poly(ADP-Ribose) Levels in Primary Human Keratinocytes, as Detected by a Novel Whole-Cell ELISA. Int J Mol Sci 2024; 25:5583. [PMID: 38891771 PMCID: PMC11171802 DOI: 10.3390/ijms25115583] [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: 04/05/2024] [Revised: 05/13/2024] [Accepted: 05/16/2024] [Indexed: 06/21/2024] Open
Abstract
Photoprotective properties of 1,25-dihydroxyvitamin D3 (1,25(OH)2D3) to reduce UV-induced DNA damage have been established in several studies. UV-induced DNA damage in skin such as single or double strand breaks is known to initiate several cellular mechanisms including activation of poly(ADP-ribose) (pADPr) polymerase-1 (PARP-1). DNA damage from UV also increases extracellular signal-related kinase (ERK) phosphorylation, which further increases PARP activity. PARP-1 functions by using cellular nicotinamide adenine dinucleotide (NAD+) to synthesise pADPr moieties and attach these to target proteins involved in DNA repair. Excessive PARP-1 activation following cellular stress such as UV irradiation may result in excessive levels of cellular pADPr. This can also have deleterious effects on cellular energy levels due to depletion of NAD+ to suboptimal levels. Since our previous work indicated that 1,25(OH)2D3 reduced UV-induced DNA damage in part through increased repair via increased energy availability, the current study investigated the effect of 1,25(OH)2D3 on UV-induced PARP-1 activity using a novel whole-cell enzyme- linked immunosorbent assay (ELISA) which quantified levels of the enzymatic product of PARP-1, pADPr. This whole cell assay used around 5000 cells per replicate measurement, which represents a 200-400-fold decrease in cell requirement compared to current commercial assays that measure in vitro pADPr levels. Using our assay, we observed that UV exposure significantly increased pADPr levels in human keratinocytes, while 1,25(OH)2D3 significantly reduced levels of UV-induced pADPr in primary human keratinocytes to a similar extent as a known PARP-1 inhibitor, 3-aminobenzamide (3AB). Further, both 1,25(OH)2D3 and 3AB as well as a peptide inhibitor of ERK-phosphorylation significantly reduced DNA damage in UV-exposed keratinocytes. The current findings support the proposal that reduction in pADPr levels may be critical for the function of 1,25(OH)2D3 in skin to reduce UV-induced DNA damage.
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Affiliation(s)
| | - Vanessa Bernadette Sequeira
- Department of Physiology, School of Medical Sciences and Bosch Institute, The University of Sydney, Sydney, NSW 2006, Australia
| | - Chen Yang
- Department of Physiology, School of Medical Sciences and Bosch Institute, The University of Sydney, Sydney, NSW 2006, Australia
| | - Katie Marie Dixon
- Department of Anatomy and Histology and Bosch Institute, The University of Sydney, Sydney, NSW 2006, Australia;
| | - Andrew J. A. Holland
- Douglas Cohen Department of Paediatric Surgery, The Children’s Hospital at Westmead Clinical School, The Faculty of Medicine and Health, The University of Sydney, Sydney, NSW 2006, Australia
| | - Rebecca Sara Mason
- Department of Physiology, School of Medical Sciences and Bosch Institute, The University of Sydney, Sydney, NSW 2006, Australia
- School of Life and Environmental Sciences and Charles Perkins Centre, The University of Sydney, Sydney, NSW 2006, Australia
| | - Mark Stephen Rybchyn
- Department of Physiology, School of Medical Sciences and Bosch Institute, The University of Sydney, Sydney, NSW 2006, Australia
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Szántó M, Yélamos J, Bai P. Specific and shared biological functions of PARP2 - is PARP2 really a lil' brother of PARP1? Expert Rev Mol Med 2024; 26:e13. [PMID: 38698556 PMCID: PMC11140550 DOI: 10.1017/erm.2024.14] [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: 11/28/2023] [Revised: 03/07/2024] [Accepted: 03/20/2024] [Indexed: 05/05/2024]
Abstract
PARP2, that belongs to the family of ADP-ribosyl transferase enzymes (ART), is a discovery of the millennium, as it was identified in 1999. Although PARP2 was described initially as a DNA repair factor, it is now evident that PARP2 partakes in the regulation or execution of multiple biological processes as inflammation, carcinogenesis and cancer progression, metabolism or oxidative stress-related diseases. Hereby, we review the involvement of PARP2 in these processes with the aim of understanding which processes are specific for PARP2, but not for other members of the ART family. A better understanding of the specific functions of PARP2 in all of these biological processes is crucial for the development of new PARP-centred selective therapies.
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Affiliation(s)
- Magdolna Szántó
- Department of Medical Chemistry, Faculty of Medicine, University of Debrecen, Debrecen, 4032, Hungary
| | - José Yélamos
- Hospital del Mar Research Institute, Barcelona, Spain
| | - Péter Bai
- HUN-REN-UD Cell Biology and Signaling Research Group, Debrecen, 4032, Hungary
- MTA-DE Lendület Laboratory of Cellular Metabolism, Debrecen, 4032, Hungary
- Research Center for Molecular Medicine, Faculty of Medicine, University of Debrecen, Debrecen 4032, Hungary
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Muoio D, Laspata N, Dannenberg RL, Curry C, Darkoa-Larbi S, Hedglin M, Uttam S, Fouquerel E. PARP2 promotes Break Induced Replication-mediated telomere fragility in response to replication stress. Nat Commun 2024; 15:2857. [PMID: 38565848 PMCID: PMC10987537 DOI: 10.1038/s41467-024-47222-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Accepted: 03/22/2024] [Indexed: 04/04/2024] Open
Abstract
PARP2 is a DNA-dependent ADP-ribosyl transferase (ARTs) enzyme with Poly(ADP-ribosyl)ation activity that is triggered by DNA breaks. It plays a role in the Base Excision Repair pathway, where it has overlapping functions with PARP1. However, additional roles for PARP2 have emerged in the response of cells to replication stress. In this study, we demonstrate that PARP2 promotes replication stress-induced telomere fragility and prevents telomere loss following chronic induction of oxidative DNA lesions and BLM helicase depletion. Telomere fragility results from the activity of the break-induced replication pathway (BIR). During this process, PARP2 promotes DNA end resection, strand invasion and BIR-dependent mitotic DNA synthesis by orchestrating POLD3 recruitment and activity. Our study has identified a role for PARP2 in the response to replication stress. This finding may lead to the development of therapeutic approaches that target DNA-dependent ART enzymes, particularly in cancer cells with high levels of replication stress.
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Affiliation(s)
- Daniela Muoio
- UPMC Hillman Cancer Center, University of Pittsburgh Cancer Institute, Department of Pharmacology and Chemical Biology, Pittsburgh, PA, 15213, USA
| | - Natalie Laspata
- UPMC Hillman Cancer Center, University of Pittsburgh Cancer Institute, Department of Pharmacology and Chemical Biology, Pittsburgh, PA, 15213, USA
- Department of Biochemistry and Molecular Biology, Thomas Jefferson University, 233S. 10th street, Philadelphia, PA, 19107, USA
| | - Rachel L Dannenberg
- Department of Chemistry, The Pennsylvania State University, University park, State College, PA, 16802, USA
| | - Caroline Curry
- Department of Biochemistry and Molecular Biology, Thomas Jefferson University, 233S. 10th street, Philadelphia, PA, 19107, USA
| | - Simone Darkoa-Larbi
- Department of Biochemistry and Molecular Biology, Thomas Jefferson University, 233S. 10th street, Philadelphia, PA, 19107, USA
| | - Mark Hedglin
- Department of Chemistry, The Pennsylvania State University, University park, State College, PA, 16802, USA
| | - Shikhar Uttam
- Department of Computational and Systems Biology, UPMC Hillman Cancer Center, University of Pittsburgh, 5117 Centre Avenue, Pittsburgh, PA, 15213, USA
| | - Elise Fouquerel
- UPMC Hillman Cancer Center, University of Pittsburgh Cancer Institute, Department of Pharmacology and Chemical Biology, Pittsburgh, PA, 15213, USA.
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Bencsics M, Bányai B, Ke H, Csépányi-Kömi R, Sasvári P, Dantzer F, Hanini N, Benkő R, Horváth EM. PARP2 downregulation in T cells ameliorates lipopolysaccharide-induced inflammation of the large intestine. Front Immunol 2023; 14:1135410. [PMID: 37457706 PMCID: PMC10347374 DOI: 10.3389/fimmu.2023.1135410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2022] [Accepted: 06/12/2023] [Indexed: 07/18/2023] Open
Abstract
Introduction T cell-dependent inflammatory response with the upregulation of helper 17 T cells (Th17) and the downregulation of regulatory T cells (Treg) accompanied by the increased production of tumor necrosis alpha (TNFa) is characteristic of inflammatory bowel diseases (IBD). Modulation of T cell response may alleviate the inflammation thus reduce intestinal damage. Poly(ADP-ribose) polymerase-2 (PARP2) plays role in the development, differentiation and reactivity of T cell subpopulations. Our aim was to investigate the potential beneficial effect of T cell-specific PARP2 downregulation in the lipopolysaccharide (LPS) induced inflammatory response of the cecum and the colon. Methods Low-dose LPS was injected intraperitoneally to induce local inflammatory response, characterized by increased TNFa production, in control (CD4Cre; PARP2+/+) and T cell-specific conditional PARP2 knockout (CD4Cre; PARP2f/f) mice. TNFa, IL-1b, IL-17 levels were measured by ELISA, oxidative-nitrative stress was estimated by immunohistochemistry, while PARP1 activity, p38 MAPK and ERK phosphorylation, and NF-kB expression in large intestine tissue samples were examined by Western-blot. Systemic & local T cell subpopulation; Th17 and Treg alterations were also investigated using flowcytometry and immunohistochemistry. Results In control animals, LPS induced intestinal inflammation with increased TNFa production, while no significant elevation of TNFa production was observed in T cell-specific PARP2 knockout animals. The absence of LPS-induced elevation in TNFa levels was accompanied by the absence of IL-1b elevation and the suppression of IL-17 production, showing markedly reduced inflammatory response. The increase in oxidative-nitrative stress and PARP1-activation was also absent in these tissues together with altered ERK and NF-kB activation. An increase in the number of the anti-inflammatory Treg cells in the intestinal mucosa was observed in these animals, together with the reduction of Treg count in the peripheral circulation. Discussion Our results confirmed that T cell-specific PARP2 downregulation ameliorated LPS-induced colitis. The dampened TNFa production, decreased IL-17 production and the increased intestinal regulatory T cell number after LPS treatment may be also beneficial during inflammatory processes seen in IBD. By reducing oxidative-nitrative stress and PARP1 activation, T cell-specific PARP2 downregulation may also alleviate intestinal tissue damage.
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Affiliation(s)
- Máté Bencsics
- Department of Physiology, Semmelweis University, Budapest, Hungary
| | - Bálint Bányai
- Department of Physiology, Semmelweis University, Budapest, Hungary
| | - Haoran Ke
- Department of Physiology, Semmelweis University, Budapest, Hungary
| | | | - Péter Sasvári
- Department of Physiology, Semmelweis University, Budapest, Hungary
| | - Françoise Dantzer
- UMR7242, Biotechnology and Cell Signaling, CNRS/Université de Strasbourg, Strasbourg, France
| | - Najat Hanini
- UMR7242, Biotechnology and Cell Signaling, CNRS/Université de Strasbourg, Strasbourg, France
| | - Rita Benkő
- Department of Physiology, Semmelweis University, Budapest, Hungary
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Vertecchi E, Rizzo A, Salvati E. Telomere Targeting Approaches in Cancer: Beyond Length Maintenance. Int J Mol Sci 2022; 23:ijms23073784. [PMID: 35409143 PMCID: PMC8998427 DOI: 10.3390/ijms23073784] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Revised: 03/25/2022] [Accepted: 03/26/2022] [Indexed: 12/19/2022] Open
Abstract
Telomeres are crucial structures that preserve genome stability. Their progressive erosion over numerous DNA duplications determines the senescence of cells and organisms. As telomere length homeostasis is critical for cancer development, nowadays, telomere maintenance mechanisms are established targets in cancer treatment. Besides telomere elongation, telomere dysfunction impinges on intracellular signaling pathways, in particular DNA damage signaling and repair, affecting cancer cell survival and proliferation. This review summarizes and discusses recent findings in anticancer drug development targeting different “telosome” components.
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Affiliation(s)
- Eleonora Vertecchi
- Institute of Molecular Biology and Pathology, National Research Council, Rome, Italy, c/o Department of Biology and Biotechnology, Sapienza University of Rome, Via degli Apuli 4, 00185 Rome, Italy;
| | - Angela Rizzo
- Oncogenomic and Epigenetic Unit, IRCCS Regina Elena National Cancer Institute, Via Elio Chianesi 53, 00144 Rome, Italy;
| | - Erica Salvati
- Institute of Molecular Biology and Pathology, National Research Council, Rome, Italy, c/o Department of Biology and Biotechnology, Sapienza University of Rome, Via degli Apuli 4, 00185 Rome, Italy;
- Correspondence:
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Muoio D, Laspata N, Fouquerel E. Functions of ADP-ribose transferases in the maintenance of telomere integrity. Cell Mol Life Sci 2022; 79:215. [PMID: 35348914 PMCID: PMC8964661 DOI: 10.1007/s00018-022-04235-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Revised: 03/03/2022] [Accepted: 03/07/2022] [Indexed: 12/21/2022]
Abstract
The ADP-ribose transferase (ART) family comprises 17 enzymes that catalyze mono- or poly-ADP-ribosylation, a post-translational modification of proteins. Present in all subcellular compartments, ARTs are implicated in a growing number of biological processes including DNA repair, replication, transcription regulation, intra- and extra-cellular signaling, viral infection and cell death. Five members of the family, PARP1, PARP2, PARP3, tankyrase 1 and tankyrase 2 are mainly described for their crucial functions in the maintenance of genome stability. It is well established that the most describedrole of PARP1, 2 and 3 is the repair of DNA lesions while tankyrases 1 and 2 are crucial for maintaining the integrity of telomeres. Telomeres, nucleoprotein complexes located at the ends of eukaryotic chromosomes, utilize their unique structure and associated set of proteins to orchestrate the mechanisms necessary for their own protection and replication. While the functions of tankyrases 1 and 2 at telomeres are well known, several studies have also brought PARP1, 2 and 3 to the forefront of telomere protection. The singular quality of the telomeric environment has highlighted protein interactions and molecular pathways distinct from those described throughout the genome. The aim of this review is to provide an overview of the current knowledge on the multiple roles of PARP1, PARP2, PARP3, tankyrase 1 and tankyrase 2 in the maintenance and preservation of telomere integrity.
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Affiliation(s)
- Daniela Muoio
- UPMC Cancer Institute and Department of Pharmacology and Chemical Biology at the University of Pittsburgh, Hillman Cancer Center, 5115 Centre Avenue, Pittsburgh, PA, 15213, USA
| | - Natalie Laspata
- Department of Biochemistry and Molecular Biology, Thomas Jefferson University, 233 S. 10th street, Philadelphia, PA, 19107, USA
| | - Elise Fouquerel
- UPMC Cancer Institute and Department of Pharmacology and Chemical Biology at the University of Pittsburgh, Hillman Cancer Center, 5115 Centre Avenue, Pittsburgh, PA, 15213, USA.
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8
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Telomeres and Cancer. Life (Basel) 2021; 11:life11121405. [PMID: 34947936 PMCID: PMC8704776 DOI: 10.3390/life11121405] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Revised: 12/01/2021] [Accepted: 12/06/2021] [Indexed: 12/18/2022] Open
Abstract
Telomeres cap the ends of eukaryotic chromosomes and are indispensable chromatin structures for genome protection and replication. Telomere length maintenance has been attributed to several functional modulators, including telomerase, the shelterin complex, and the CST complex, synergizing with DNA replication, repair, and the RNA metabolism pathway components. As dysfunctional telomere maintenance and telomerase activation are associated with several human diseases, including cancer, the molecular mechanisms behind telomere length regulation and protection need particular emphasis. Cancer cells exhibit telomerase activation, enabling replicative immortality. Telomerase reverse transcriptase (TERT) activation is involved in cancer development through diverse activities other than mediating telomere elongation. This review describes the telomere functions, the role of functional modulators, the implications in cancer development, and the future therapeutic opportunities.
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Okunlola FO, Akawa OB, Soliman MES. Could the spanning of NAM-AD subsites by poly (ADP ribose) polymerase inhibitors potentiate their selective inhibitory activity in breast cancer treatment? Insight from biophysical computations. MOLECULAR SIMULATION 2021. [DOI: 10.1080/08927022.2021.1994562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Felix O. Okunlola
- Molecular Bio-computation and Drug Design Laboratory, School of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
| | - Oluwole B. Akawa
- Molecular Bio-computation and Drug Design Laboratory, School of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
| | - Mahmoud E. S. Soliman
- Molecular Bio-computation and Drug Design Laboratory, School of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
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Imran SAM, Yazid MD, Cui W, Lokanathan Y. The Intra- and Extra-Telomeric Role of TRF2 in the DNA Damage Response. Int J Mol Sci 2021; 22:ijms22189900. [PMID: 34576063 PMCID: PMC8470803 DOI: 10.3390/ijms22189900] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Revised: 09/06/2021] [Accepted: 09/09/2021] [Indexed: 12/12/2022] Open
Abstract
Telomere repeat binding factor 2 (TRF2) has a well-known function at the telomeres, which acts to protect the telomere end from being recognized as a DNA break or from unwanted recombination. This protection mechanism prevents DNA instability from mutation and subsequent severe diseases caused by the changes in DNA, such as cancer. Since TRF2 actively inhibits the DNA damage response factors from recognizing the telomere end as a DNA break, many more studies have also shown its interactions outside of the telomeres. However, very little has been discovered on the mechanisms involved in these interactions. This review aims to discuss the known function of TRF2 and its interaction with the DNA damage response (DDR) factors at both telomeric and non-telomeric regions. In this review, we will summarize recent progress and findings on the interactions between TRF2 and DDR factors at telomeres and outside of telomeres.
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Affiliation(s)
- Siti A. M. Imran
- Centre for Tissue Engineering and Regenerative Medicine, Faculty of Medicine, Universiti Kebangsaan Malaysia, Jalan Yaacob Latiff, Bandar Tun Razak, Cheras, Kuala Lumpur 56000, Malaysia; (S.A.M.I.); (M.D.Y.)
| | - Muhammad Dain Yazid
- Centre for Tissue Engineering and Regenerative Medicine, Faculty of Medicine, Universiti Kebangsaan Malaysia, Jalan Yaacob Latiff, Bandar Tun Razak, Cheras, Kuala Lumpur 56000, Malaysia; (S.A.M.I.); (M.D.Y.)
| | - Wei Cui
- Institute of Reproductive and Developmental Biology, Faculty of Medicine, Imperial College London, Du Cane Road, London W12 0NN, UK;
| | - Yogeswaran Lokanathan
- Centre for Tissue Engineering and Regenerative Medicine, Faculty of Medicine, Universiti Kebangsaan Malaysia, Jalan Yaacob Latiff, Bandar Tun Razak, Cheras, Kuala Lumpur 56000, Malaysia; (S.A.M.I.); (M.D.Y.)
- Correspondence: ; Tel.: +603-9145-7704
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Silencing of Poly(ADP-Ribose) Polymerase-2 Induces Mitochondrial Reactive Species Production and Mitochondrial Fragmentation. Cells 2021; 10:cells10061387. [PMID: 34199944 PMCID: PMC8227884 DOI: 10.3390/cells10061387] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2021] [Revised: 05/18/2021] [Accepted: 06/02/2021] [Indexed: 12/11/2022] Open
Abstract
PARP2 is a DNA repair protein. The deletion of PARP2 induces mitochondrial biogenesis and mitochondrial activity by increasing NAD+ levels and inducing SIRT1 activity. We show that the silencing of PARP2 causes mitochondrial fragmentation in myoblasts. We assessed multiple pathways that can lead to mitochondrial fragmentation and ruled out the involvement of mitophagy, the fusion-fission machinery, SIRT1, and mitochondrial unfolded protein response. Nevertheless, mitochondrial fragmentation was reversed by treatment with strong reductants, such as reduced glutathione (GSH), N-acetyl-cysteine (NAC), and a mitochondria-specific antioxidant MitoTEMPO. The effect of MitoTEMPO on mitochondrial morphology indicates the production of reactive oxygen species of mitochondrial origin. Elimination of reactive oxygen species reversed mitochondrial fragmentation in PARP2-silenced cells.
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Mukherjee J, Pandita A, Kamalakar C, Johannessen TC, Ohba S, Tang Y, Dalle-Ore CL, Bjerkvig R, Pieper RO. RETRACTED: A subset of PARP inhibitors induces lethal telomere fusion in ALT-dependent tumor cells. Sci Transl Med 2021; 13:13/592/eabc7211. [PMID: 33952676 DOI: 10.1126/scitranslmed.abc7211] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Revised: 10/07/2020] [Accepted: 02/26/2021] [Indexed: 12/30/2022]
Abstract
About 10% of all tumors, including most lower-grade astrocytoma, rely on the alternative lengthening of telomere (ALT) mechanism to resolve telomeric shortening and avoid limitations on their growth. Here, we found that dependence on the ALT mechanism made cells hypersensitive to a subset of poly(ADP-ribose) polymerase inhibitors (PARPi). We found that this hypersensitivity was not associated with PARPi-created genomic DNA damage as in most PARPi-sensitive populations but rather with PARPi-induced telomere fusion. Mechanistically, we determined that PARP1 was recruited to the telomeres of ALT-dependent cells as part of a DNA damage response. By recruiting MRE11 and BRCC3 to stabilize TRF2 at the ends of telomeres, PARP1 blocked chromosomal fusion. Exposure of ALT-dependent tumor cells to a subset of PARPi induced a conformational change in PARP1 that limited binding to MRE11 and BRCC3 and delayed release of the TRF2-mediated block on lethal telomeric fusion. These results therefore provide a basis for PARPi treatment of ALT-dependent tumors, as well as establish chromosome fusion as a biomarker of their activity.
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Affiliation(s)
- Joydeep Mukherjee
- Department of Neurosurgery and The Brain Tumor Center, University of California-San Francisco, San Francisco, CA 94158, USA
| | - Ajay Pandita
- Core Diagnostics, 3535 Breakwater Avenue, Hayward, CA 94545, USA
| | - Chatla Kamalakar
- Department of Integrative Biology, University of California-Berkeley, Berkeley, CA 94720, USA
| | - Tor-Christian Johannessen
- The Kristian Gerhard Jebsen Brain Tumor Research Centre, Department of Biomedicine, University of Bergen, Jonas Lies Vei 91, 5019, Bergen, Norway
| | - Shigeo Ohba
- Department of Neurosurgery, Fujita Health University, Toyoake 4701192, Aichi, Japan
| | - Yongjian Tang
- Department of Neurosurgery and The Brain Tumor Center, University of California-San Francisco, San Francisco, CA 94158, USA
| | - Cecilia L Dalle-Ore
- Department of Neurosurgery and The Brain Tumor Center, University of California-San Francisco, San Francisco, CA 94158, USA
| | - Rolf Bjerkvig
- The Kristian Gerhard Jebsen Brain Tumor Research Centre, Department of Biomedicine, University of Bergen, Jonas Lies Vei 91, 5019, Bergen, Norway.,Department of Oncology, Luxembourg Institute of Health, 84, Val Fleuri, L-1526, Luxembourg
| | - Russell O Pieper
- Department of Neurosurgery and The Brain Tumor Center, University of California-San Francisco, San Francisco, CA 94158, USA.
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Sadhukhan R, Ghosh U. PARP1 modulates telomere sister chromatid exchange and telomere length homeostasis by regulating telomere localization of SLX4 in U2OS cells. Life Sci 2021; 277:119556. [PMID: 33945829 DOI: 10.1016/j.lfs.2021.119556] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2021] [Revised: 04/12/2021] [Accepted: 04/20/2021] [Indexed: 11/16/2022]
Abstract
OBJECTIVE Poly(ADP-ribose) polymerase1 (PARP1) interacts and poly(ADP-ribosyl)ates telomere repeat binding factor 2 (TRF2), which acts as a platform to recruit a large number of proteins at the telomere. Since the discovery of TRF2-SLX4 interaction, SLX4 is becoming the key player in telomere length (TL) maintenance and repair by telomere sister chromatid exchange (T-SCE). Defective TL maintenance pathway results in a spectrum of diseases called telomeropathies like dyskeratosis congenita, aplastic anemia, fanconi anemia, cancer. We aimed to study the role of SLX4 and PARP1 on each other's telomere localization, T-SCE, and TL maintenance in human telomerase-negative osteosarcoma U2OS cells to understand some of the molecular mechanisms of telomere homeostasis. MATERIALS AND METHODS We checked the role of SLX4 and PARP1 on each other's telomere localization by telomere immunofluorescence. We have cloned full-length wild-type and catalytically inactive mutant PARP1 to understand the role of poly(ADP-ribosyl)ation reaction by PARP1 in telomere length homeostasis. TL of U2OS cells was measured by Q-FISH. T-SCE was measured by Telomere-FISH. KEY FINDINGS We observed that SLX4 has no role in the telomere localization of PARP1. However, reduced localization of SLX4 at undamaged and damaged telomere upon PARP1 depletion was reversed by overexpression of exogenous wild-type PARP1 but not by overexpression of catalytically inactive mutant PARP1. PARP1 depletion synergized SLX4 depletion-mediated reduction of T-SCE. Furthermore, SLX4 depletion elongated TL, and combined insufficiency of SLX4 with PARP1 further elongated TL. CONCLUSION So, PARP1 controls SLX4 recruitment at telomere by poly(ADP-ribosyl)ation reaction, thereby regulating SLX4-mediated T-SCE and TL homeostasis.
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Affiliation(s)
- Ratan Sadhukhan
- Department of Biochemistry & Biophysics, University of Kalyani, Kalyani 741235, India
| | - Utpal Ghosh
- Department of Biochemistry & Biophysics, University of Kalyani, Kalyani 741235, India.
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Demény MA, Virág L. The PARP Enzyme Family and the Hallmarks of Cancer Part 1. Cell Intrinsic Hallmarks. Cancers (Basel) 2021; 13:cancers13092042. [PMID: 33922595 PMCID: PMC8122967 DOI: 10.3390/cancers13092042] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Revised: 04/02/2021] [Accepted: 04/20/2021] [Indexed: 12/21/2022] Open
Abstract
The 17-member poly (ADP-ribose) polymerase enzyme family, also known as the ADP-ribosyl transferase diphtheria toxin-like (ARTD) enzyme family, contains DNA damage-responsive and nonresponsive members. Only PARP1, 2, 5a, and 5b are capable of modifying their targets with poly ADP-ribose (PAR) polymers; the other PARP family members function as mono-ADP-ribosyl transferases. In the last decade, PARP1 has taken center stage in oncology treatments. New PARP inhibitors (PARPi) have been introduced for the targeted treatment of breast cancer 1 or 2 (BRCA1/2)-deficient ovarian and breast cancers, and this novel therapy represents the prototype of the synthetic lethality paradigm. Much less attention has been paid to other PARPs and their potential roles in cancer biology. In this review, we summarize the roles played by all PARP enzyme family members in six intrinsic hallmarks of cancer: uncontrolled proliferation, evasion of growth suppressors, cell death resistance, genome instability, reprogrammed energy metabolism, and escape from replicative senescence. In a companion paper, we will discuss the roles of PARP enzymes in cancer hallmarks related to cancer-host interactions, including angiogenesis, invasion and metastasis, evasion of the anticancer immune response, and tumor-promoting inflammation. While PARP1 is clearly involved in all ten cancer hallmarks, an increasing body of evidence supports the role of other PARPs in modifying these cancer hallmarks (e.g., PARP5a and 5b in replicative immortality and PARP2 in cancer metabolism). We also highlight controversies, open questions, and discuss prospects of recent developments related to the wide range of roles played by PARPs in cancer biology. Some of the summarized findings may explain resistance to PARPi therapy or highlight novel biological roles of PARPs that can be therapeutically exploited in novel anticancer treatment paradigms.
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Affiliation(s)
- Máté A. Demény
- Department of Medical Chemistry, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary
- MTA-DE Cell Biology and Signaling Research Group, University of Debrecen, 4032 Debrecen, Hungary
- Correspondence: (M.A.D.); (L.V.)
| | - László Virág
- Department of Medical Chemistry, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary
- MTA-DE Cell Biology and Signaling Research Group, University of Debrecen, 4032 Debrecen, Hungary
- Correspondence: (M.A.D.); (L.V.)
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15
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Salimi-Jeda A, Badrzadeh F, Esghaei M, Abdoli A. The role of telomerase and viruses interaction in cancer development, and telomerase-dependent therapeutic approaches. Cancer Treat Res Commun 2021; 27:100323. [PMID: 33530025 DOI: 10.1016/j.ctarc.2021.100323] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Revised: 01/19/2021] [Accepted: 01/21/2021] [Indexed: 12/21/2022]
Abstract
Human telomerase reverse transcriptase (hTERT) is an enzyme that is critically involved in elongating and maintaining telomeres length to control cell life span and replicative potential. Telomerase activity is continuously expressed in human germ-line cells and most cancer cells, whereas it is suppressed in most somatic cells. In normal cells, by reducing telomerase activity and progressively shortening the telomeres, the cells progress to the senescence or apoptosis process. However, in cancer cells, telomere lengths remain constant due to telomerase's reactivation, and cells continue to proliferate and inhibit apoptosis, and ultimately lead to cancer development and human death due to metastasis. Studies demonstrated that several DNA and RNA oncoviruses could interact with telomerase by integrating their genome sequence within the host cell telomeres specifically. Through the activation of the hTERT promoter and lengthening the telomere, these cells contributes to cancer development. Since oncoviruses can activate telomerase and increase hTERT expression, there are several therapeutic strategies based on targeting the telomerase of cancer cells like telomerase-targeted peptide vaccines, hTERT-targeting dendritic cells (DCs), hTERT-targeting gene therapy, and hTERT-targeting CRISPR/Cas9 system that can overcome tumor-mediated toleration mechanisms and specifically apoptosis in cancer cells. This study reviews available data on the molecular structure of telomerase and the role of oncoviruses and telomerase interaction in cancer development and telomerase-dependent therapeutic approaches to conquest the cancer cells.
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Affiliation(s)
- Ali Salimi-Jeda
- Department of Virology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran.
| | - Fariba Badrzadeh
- Faculti of Medicine, Golestan University of Medical sciences, Golestan, Iran.
| | - Maryam Esghaei
- Department of Virology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran.
| | - Asghar Abdoli
- Department of Hepatitis and AIDS, Pasteur Institute of Iran, Tehran, Iran.
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16
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Al-Share B, Hammad N, Diab M. Pancreatic adenocarcinoma: molecular drivers and the role of targeted therapy. Cancer Metastasis Rev 2021; 40:355-371. [PMID: 33398620 DOI: 10.1007/s10555-020-09948-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Accepted: 12/15/2020] [Indexed: 01/05/2023]
Abstract
Prognosis from pancreatic ductal adenocarcinoma (PDAC) continues to be poor despite the many efforts channeled to improve its management. Although the mainstay treatment is still traditional chemotherapy, recent advances highlighted a promising potential for targeted therapy in the management of this disease. Those advances emphasize the significance of timely genomic profiling of tumor tissue as well as germline testing of patients to identify potential markers of targeted therapy. While targeted therapy is reserved for a relatively small subset of patients with PDAC, ongoing research is uncovering additional markers, and targeted agents, that will hopefully translate to better outcomes for patients.
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Affiliation(s)
- Bayan Al-Share
- Department of Oncology, Wayne State University, Karmanos Cancer Institute, Detroit, MI, USA
| | - Nour Hammad
- Department of Oncology, Ascension Providence Hospital and Medical Center/Michigan State University/Collage of Human Medicine, Southfield, MI, USA
| | - Maria Diab
- Department of Oncology, Emory University, Atlanta, GA, USA.
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17
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Effect of exercise on telomere length and telomere proteins expression in mdx mice. Mol Cell Biochem 2020; 470:189-197. [DOI: 10.1007/s11010-020-03761-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2020] [Accepted: 05/16/2020] [Indexed: 12/19/2022]
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18
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Eisemann T, Pascal JM. Poly(ADP-ribose) polymerase enzymes and the maintenance of genome integrity. Cell Mol Life Sci 2020; 77:19-33. [PMID: 31754726 PMCID: PMC11104942 DOI: 10.1007/s00018-019-03366-0] [Citation(s) in RCA: 65] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Revised: 10/11/2019] [Accepted: 10/31/2019] [Indexed: 01/15/2023]
Abstract
DNA damage response (DDR) relies on swift and accurate signaling to rapidly identify DNA lesions and initiate repair. A critical DDR signaling and regulatory molecule is the posttranslational modification poly(ADP-ribose) (PAR). PAR is synthesized by a family of structurally and functionally diverse proteins called poly(ADP-ribose) polymerases (PARPs). Although PARPs share a conserved catalytic domain, unique regulatory domains of individual family members endow PARPs with unique properties and cellular functions. Family members PARP-1, PARP-2, and PARP-3 (DDR-PARPs) are catalytically activated in the presence of damaged DNA and act as damage sensors. Family members tankyrase-1 and closely related tankyrase-2 possess SAM and ankyrin repeat domains that regulate their diverse cellular functions. Recent studies have shown that the tankyrases share some overlapping functions with the DDR-PARPs, and even perform novel functions that help preserve genomic integrity. In this review, we briefly touch on DDR-PARP functions, and focus on the emerging roles of tankyrases in genome maintenance. Preservation of genomic integrity thus appears to be a common function of several PARP family members, depicting PAR as a multifaceted guardian of the genome.
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Affiliation(s)
- Travis Eisemann
- Department of Biochemistry and Molecular Biology, Thomas Jefferson University, Philadelphia, PA, USA
- Department of Molecular Biology, Princeton University, Princeton, NJ, USA
| | - John M Pascal
- Department of Biochemistry and Molecular Medicine, Université de Montréal, Montréal, QC, Canada.
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19
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Hoch NC, Polo LM. ADP-ribosylation: from molecular mechanisms to human disease. Genet Mol Biol 2019; 43:e20190075. [PMID: 31930280 PMCID: PMC7198025 DOI: 10.1590/1678-4685-gmb-2019-0075] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Accepted: 07/04/2019] [Indexed: 12/23/2022] Open
Abstract
Post-translational modification of proteins by ADP-ribosylation, catalysed by
poly (ADP-ribose) polymerases (PARPs) using NAD+ as a substrate,
plays central roles in DNA damage signalling and repair, modulates a range of
cellular signalling cascades and initiates programmed cell death by parthanatos.
Here, we present mechanistic aspects of ADP-ribose modification, PARP activation
and the cellular functions of ADP-ribose signalling, and discuss how this
knowledge is uncovering therapeutic avenues for the treatment of increasingly
prevalent human diseases such as cancer, ischaemic damage and
neurodegeneration.
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Affiliation(s)
- Nicolas C Hoch
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, São Paulo, SP, Brazil
| | - Luis M Polo
- Cancer Research UK DNA Repair Enzymes Group, Genome Damage and Stability Centre, School of Life Sciences, University of Sussex, Falmer, Brighton, UK.,Institute of Histology and Embryology of Mendoza - CONICET, Mendoza, Argentina
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20
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The DNA-damage response and nuclear events as regulators of nonapoptotic forms of cell death. Oncogene 2019; 39:1-16. [PMID: 31462710 DOI: 10.1038/s41388-019-0980-6] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Revised: 08/05/2019] [Accepted: 08/09/2019] [Indexed: 12/20/2022]
Abstract
The maintenance of genome stability is essential for the cell as the integrity of genomic information guaranties reproduction of a whole organism. DNA damage occurring in response to different natural and nonnatural stimuli (errors in DNA replication, UV radiation, chemical agents, etc.) is normally detected by special cellular machinery that induces DNA repair. However, further accumulation of genetic lesions drives the activation of cell death to eliminate cells with defective genome. This particular feature is used for targeting fast-proliferating tumor cells during chemo-, radio-, and immunotherapy. Among different cell death modalities induced by DNA damage, apoptosis is the best studied. Nevertheless, nonapoptotic cell death and adaptive stress responses are also activated following genotoxic stress and play a crucial role in the outcome of anticancer therapy. Here, we provide an overview of nonapoptotic cell death pathways induced by DNA damage and discuss their interplay with cellular senescence, mitotic catastrophe, and autophagy.
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21
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Selective targeting of PARP-2 inhibits androgen receptor signaling and prostate cancer growth through disruption of FOXA1 function. Proc Natl Acad Sci U S A 2019; 116:14573-14582. [PMID: 31266892 DOI: 10.1073/pnas.1908547116] [Citation(s) in RCA: 60] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Androgen receptor (AR) is a ligand-activated transcription factor and a key driver of prostate cancer (PCa) growth and progression. Understanding the factors influencing AR-mediated gene expression provides new opportunities for therapeutic intervention. Poly(ADP-ribose) Polymerase (PARP) is a family of enzymes, which posttranslationally modify a range of proteins and regulate many different cellular processes. PARP-1 and PARP-2 are two well-characterized PARP members, whose catalytic activity is induced by DNA-strand breaks and responsible for multiple DNA damage repair pathways. PARP inhibitors are promising therapeutic agents that show synthetic lethality against many types of cancer (including PCa) with homologous recombination (HR) DNA-repair deficiency. Here, we show that, beyond DNA damage repair function, PARP-2, but not PARP-1, is a critical component in AR transcriptional machinery through interacting with the pioneer factor FOXA1 and facilitating AR recruitment to genome-wide prostate-specific enhancer regions. Analyses of PARP-2 expression at both mRNA and protein levels show significantly higher expression of PARP-2 in primary PCa tumors than in benign prostate tissues, and even more so in castration-resistant prostate cancer (CRPC) tumors. Selective targeting of PARP-2 by genetic or pharmacological means blocks interaction between PARP-2 and FOXA1, which in turn attenuates AR-mediated gene expression and inhibits AR-positive PCa growth. Next-generation antiandrogens act through inhibiting androgen synthesis (abiraterone) or blocking ligand binding (enzalutamide). Selective targeting of PARP-2, however, may provide an alternative therapeutic approach for AR inhibition by disruption of FOXA1 function, which may be beneficial to patients, irrespective of their DNA-repair deficiency status.
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22
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Sun Q, Gatie MI, Kelly GM. Serum-dependent and -independent regulation of PARP2. Biochem Cell Biol 2019; 97:600-611. [PMID: 30880404 DOI: 10.1139/bcb-2018-0345] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
PARP2 belongs to a family of proteins involved in cell differentiation, DNA damage repair, cellular energy expenditure, and chromatin modeling. In addition to these overlapping functions with PARP1, PARP2 participates in spermatogenesis, T-cell maturation, extra-embryonic endoderm formation, adipogenesis, lipid metabolism, and cholesterol homeostasis. Knowledge of the functions of PARP2 is far from complete, and the mechanism(s) by which the gene and protein are regulated are unknown. In this study, we found that two different mechanisms are used in vitro to regulate PARP2 levels. In the presence of serum, PARP2 is degraded through the ubiquitin-proteasome pathway; however, when serum is removed or dialyzed with a 3.5 kDa molecular cut membrane, PARP2 rapidly becomes sodium dodecyl sulphate- and urea-insoluble. Despite the presence of a putative serum response element in the PARP2 gene, transcription is not affected by serum deprivation, and PARP2 levels are restored when serum is replaced. The loss of PARP2 affects cell differentiation and gene expression linked to cholesterol and lipid metabolism. These observations highlight the critical roles that PARP2 plays under different physiological conditions, and reveal that PARP2 is tightly regulated by distinct pathways.
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Affiliation(s)
- Qizhi Sun
- Department of Biology, Molecular Genetics Unit, Western University, 1151 Richmond Street, London, ON N6A 5B7, Canada
| | - Mohamed I Gatie
- Department of Biology, Molecular Genetics Unit, Western University, 1151 Richmond Street, London, ON N6A 5B7, Canada
| | - Gregory M Kelly
- Department of Biology, Molecular Genetics Unit, Western University, 1151 Richmond Street, London, ON N6A 5B7, Canada.,Departments of Physiology, Pharmacology, and Paediatrics, Western University, 1151 Richmond Street, London, ON N6A 5B7, Canada.,Child Health Research Institute, 800 Commissioners Road East, London, ON N6C 2B5, Canada.,Ontario Institute for Regenerative Medicine, MaRS Centre, 661 University Avenue, Suite 510, Toronto, ON M5G 0A3, Canada
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23
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Telomeres in Plants and Humans: Not So Different, Not So Similar. Cells 2019; 8:cells8010058. [PMID: 30654521 PMCID: PMC6356271 DOI: 10.3390/cells8010058] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 01/07/2019] [Accepted: 01/07/2019] [Indexed: 01/01/2023] Open
Abstract
Parallel research on multiple model organisms shows that while some principles of telomere biology are conserved among all eukaryotic kingdoms, we also find some deviations that reflect different evolutionary paths and life strategies, which may have diversified after the establishment of telomerase as a primary mechanism for telomere maintenance. Much more than animals, plants have to cope with environmental stressors, including genotoxic factors, due to their sessile lifestyle. This is, in principle, made possible by an increased capacity and efficiency of the molecular systems ensuring maintenance of genome stability, as well as a higher tolerance to genome instability. Furthermore, plant ontogenesis differs from that of animals in which tissue differentiation and telomerase silencing occur during early embryonic development, and the “telomere clock” in somatic cells may act as a preventive measure against carcinogenesis. This does not happen in plants, where growth and ontogenesis occur through the serial division of apical meristems consisting of a small group of stem cells that generate a linear series of cells, which differentiate into an array of cell types that make a shoot and root. Flowers, as generative plant organs, initiate from the shoot apical meristem in mature plants which is incompatible with the human-like developmental telomere shortening. In this review, we discuss differences between human and plant telomere biology and the implications for aging, genome stability, and cell and organism survival. In particular, we provide a comprehensive comparative overview of telomere proteins acting in humans and in Arabidopsis thaliana model plant, and discuss distinct epigenetic features of telomeric chromatin in these species.
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24
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Barnes RP, Fouquerel E, Opresko PL. The impact of oxidative DNA damage and stress on telomere homeostasis. Mech Ageing Dev 2019; 177:37-45. [PMID: 29604323 PMCID: PMC6162185 DOI: 10.1016/j.mad.2018.03.013] [Citation(s) in RCA: 283] [Impact Index Per Article: 56.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2018] [Revised: 03/23/2018] [Accepted: 03/27/2018] [Indexed: 12/12/2022]
Abstract
Telomeres are dynamic nucleoprotein-DNA structures that cap and protect linear chromosome ends. Because telomeres shorten progressively with each replication, they impose a functional limit on the number of times a cell can divide. Critically short telomeres trigger cellular senescence in normal cells, or genomic instability in pre-malignant cells, which contribute to numerous degenerative and aging-related diseases including cancer. Therefore, a detailed understanding of the mechanisms of telomere loss and preservation is important for human health. Numerous studies have shown that oxidative stress is associated with accelerated telomere shortening and dysfunction. Oxidative stress caused by inflammation, intrinsic cell factors or environmental exposures, contributes to the pathogenesis of many degenerative diseases and cancer. Here we review the studies demonstrating associations between oxidative stress and accelerated telomere attrition in human tissue, mice and cell culture, and discuss possible mechanisms and cellular pathways that protect telomeres from oxidative damage.
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25
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Karicheva O, Rodriguez-Vargas JM, Wadier N, Martin-Hernandez K, Vauchelles R, Magroun N, Tissier A, Schreiber V, Dantzer F. PARP3 controls TGFβ and ROS driven epithelial-to-mesenchymal transition and stemness by stimulating a TG2-Snail-E-cadherin axis. Oncotarget 2018; 7:64109-64123. [PMID: 27579892 PMCID: PMC5325429 DOI: 10.18632/oncotarget.11627] [Citation(s) in RCA: 64] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Accepted: 08/10/2016] [Indexed: 12/30/2022] Open
Abstract
Several members of the Poly(ADP-ribose) polymerase (PARP) family are essential regulators of genome integrity, actively prospected as drug targets for cancer therapy. Among them, PARP3 is well characterized for its functions in double-strand break repair and mitotis. Here we report that PARP3 also plays an integral role in TGFβ and reactive oxygen species (ROS) dependent epithelial-to-mesenchymal transition (EMT) and stem-like cell properties in human mammary epithelial and breast cancer cells. PARP3 expression is higher in breast cancer cells of the mesenchymal phenotype and correlates with the expression of the mesenchymal marker Vimentin while being in inverse correlation with the epithelial marker E-cadherin. Furthermore, PARP3 expression is significantly upregulated during TGFβ-induced EMT in various human epithelial cells. In line with this observation, PARP3 depletion alters TGFβ-dependent EMT of mammary epithelial cells by preventing the induction of the Snail-E-cadherin axis, the dissolution of cell junctions, the acquisition of cell motility and chemoresistance. PARP3 responds to TGFβ-induced ROS to promote a TG2-Snail-E-cadherin axis during EMT. Considering the link between EMT and cancer stem cells, we show that PARP3 promotes stem-like cell properties in mammary epithelial and breast cancer cells by inducing the expression of the stem cell markers SOX2 and OCT4, by increasing the proportion of tumor initiating CD44high/CD24low population and the formation of tumor spheroid bodies, and by promoting stem cell self-renewal. These findings point to a novel role of PARP3 in the control of TGFβ-induced EMT and acquisition of stem-like cell features and further motivate efforts to identify PARP3 specific inhibitors.
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Affiliation(s)
- Olga Karicheva
- Poly(ADP-ribosyl)ation and Genome Integrity, Laboratoire d'Excellence Medalis, UMR7242, Centre National de la Recherche Scientifique/Université de Strasbourg, Institut de Recherche de l'Ecole de Biotechnologie de Strasbourg, 67412 Illkirch, France
| | - José Manuel Rodriguez-Vargas
- Poly(ADP-ribosyl)ation and Genome Integrity, Laboratoire d'Excellence Medalis, UMR7242, Centre National de la Recherche Scientifique/Université de Strasbourg, Institut de Recherche de l'Ecole de Biotechnologie de Strasbourg, 67412 Illkirch, France
| | - Nadège Wadier
- Poly(ADP-ribosyl)ation and Genome Integrity, Laboratoire d'Excellence Medalis, UMR7242, Centre National de la Recherche Scientifique/Université de Strasbourg, Institut de Recherche de l'Ecole de Biotechnologie de Strasbourg, 67412 Illkirch, France
| | - Kathline Martin-Hernandez
- Poly(ADP-ribosyl)ation and Genome Integrity, Laboratoire d'Excellence Medalis, UMR7242, Centre National de la Recherche Scientifique/Université de Strasbourg, Institut de Recherche de l'Ecole de Biotechnologie de Strasbourg, 67412 Illkirch, France
| | - Romain Vauchelles
- Laboratoire de Biophotonique et Pharmacologie, UMR7213, Centre National de la Recherche Scientifique/Université de Strasbourg, Faculté de Pharmacie, 67401 Illkirch, France
| | - Najat Magroun
- Poly(ADP-ribosyl)ation and Genome Integrity, Laboratoire d'Excellence Medalis, UMR7242, Centre National de la Recherche Scientifique/Université de Strasbourg, Institut de Recherche de l'Ecole de Biotechnologie de Strasbourg, 67412 Illkirch, France
| | - Agnès Tissier
- EMT and Cancer Cell Plasticity, Laboratoire d'Excellence DevWeCan, Equipe labellisée Ligue Nationale Contre Le Cancer, Centre de Recherche en Cancérologie, UMR INSERM 1052 CNRS 5286, Centre Léon Bérard, F-69008 Lyon, France
| | - Valérie Schreiber
- Poly(ADP-ribosyl)ation and Genome Integrity, Laboratoire d'Excellence Medalis, UMR7242, Centre National de la Recherche Scientifique/Université de Strasbourg, Institut de Recherche de l'Ecole de Biotechnologie de Strasbourg, 67412 Illkirch, France
| | - Françoise Dantzer
- Poly(ADP-ribosyl)ation and Genome Integrity, Laboratoire d'Excellence Medalis, UMR7242, Centre National de la Recherche Scientifique/Université de Strasbourg, Institut de Recherche de l'Ecole de Biotechnologie de Strasbourg, 67412 Illkirch, France
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26
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Inhibitors of telomerase and poly(ADP-ribose) polymerases synergize to limit the lifespan of pancreatic cancer cells. Oncotarget 2017; 8:83754-83767. [PMID: 29137380 PMCID: PMC5663552 DOI: 10.18632/oncotarget.19410] [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] [Received: 02/14/2017] [Accepted: 07/12/2017] [Indexed: 01/05/2023] Open
Abstract
Imetelstat (GRN163L) is a potent and selective inhibitor of telomerase. We have previously reported that GRN163L could shorten telomeres and limit the lifespan of CD18/HPAF and CAPAN1 pancreatic cancer cells. Here, we examined the effects of GRN163L on two other pancreatic cancer cell lines: AsPC1 and L3.6pl. In both lines, chronic exposure to GRN163L led to an initial shortening of telomeres followed by a stabilization of extremely short telomeres. In AsPC1 cells, telomere attrition eventually led to the induction of crisis and the loss of the treated population. In L3.6pl cells, crisis was transient and followed by the emergence of GRN163L-resistant cells, which could grow at increasing concentrations of GRN163L. The Shelterin complex is a telomere-associated complex that limits the access of telomerase to telomeres. The telomerase inhibitory function of this complex can be enhanced by drugs that block the poly(ADP-ribosyl)ation of its TRF1 and/or TRF2 subunits. Combined treatment of the GRN163L-resistant L3.6pl cells with GRN163L and 3-aminobenzamide (3AB), a general inhibitor of poly(ADP-ribose) polymerases, led to additional telomere shortening and limited the lifespan of the resistant cells. Results from this work suggest that inhibitors of telomerase and poly(ADP-ribose) polymerases can cooperate to limit the lifespan of pancreatic cancer cells.
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27
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Berardinelli F, Coluzzi E, Sgura A, Antoccia A. Targeting telomerase and telomeres to enhance ionizing radiation effects in in vitro and in vivo cancer models. MUTATION RESEARCH-REVIEWS IN MUTATION RESEARCH 2017; 773:204-219. [PMID: 28927529 DOI: 10.1016/j.mrrev.2017.02.004] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Revised: 02/13/2017] [Accepted: 02/14/2017] [Indexed: 01/05/2023]
Abstract
One of the hallmarks of cancer consists in the ability of tumor cells to divide indefinitely, and to maintain stable telomere lengths throughout the activation of specific telomere maintenance mechanisms (TMM). Therefore in the last fifteen years, researchers proposed to target telomerase or telomeric structure in order to block limitless replicative potential of cancer cells providing a fascinating strategy for a broad-spectrum cancer therapy. In the present review, we report in vitro and in vivo evidence regarding the use of chemical agents targeting both telomerase or telomere structure and showing promising antitumor effects when used in combination with ionizing radiation (IR). RNA interference, antisense oligonucleotides (e.g., GRN163L), non-nucleoside inhibitors (e.g., BIBR1532) and nucleoside analogs (e.g., AZT) represent some of the most potent strategies to inhibit telomerase activity used in combination with IR. Furthermore, radiosensitizing effects were demonstrated also for agents acting directly on the telomeric structure such as G4-ligands (e.g., RHPS4 and Telomestatin) or telomeric-oligos (T-oligos). To date, some of these compounds are under clinical evaluation (e.g., GRN163L and KML001). Advantages of Telomere/Telomerase Targeting Compounds (T/TTCs) coupled with radiotherapy may be relevant in the treatment of radioresistant tumors and in the development of new optimized treatment plans with reduced dose adsorbed by patients and consequent attenuation of short- end long-term side effects. Pros and cons of possible future applications in cancer therapy based on the combination of T/TCCs and radiation treatment are discussed.
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Affiliation(s)
- F Berardinelli
- Dipartimento di Scienze, Università Roma Tre, Rome Italy; Istituto Nazionale di Fisica Nucleare, INFN, Sezione di Roma Tre, Rome, Italy.
| | - E Coluzzi
- Dipartimento di Scienze, Università Roma Tre, Rome Italy
| | - A Sgura
- Dipartimento di Scienze, Università Roma Tre, Rome Italy; Istituto Nazionale di Fisica Nucleare, INFN, Sezione di Roma Tre, Rome, Italy
| | - A Antoccia
- Dipartimento di Scienze, Università Roma Tre, Rome Italy; Istituto Nazionale di Fisica Nucleare, INFN, Sezione di Roma Tre, Rome, Italy
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28
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Posavec Marjanović M, Crawford K, Ahel I. PARP, transcription and chromatin modeling. Semin Cell Dev Biol 2016; 63:102-113. [PMID: 27677453 DOI: 10.1016/j.semcdb.2016.09.014] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2016] [Revised: 09/14/2016] [Accepted: 09/23/2016] [Indexed: 12/21/2022]
Abstract
Compaction mode of chromatin and chromatin highly organised structures regulate gene expression. Posttranslational modifications, histone variants and chromatin remodelers modulate the compaction, structure and therefore function of specific regions of chromatin. The generation of poly(ADP-ribose) (PAR) is emerging as one of the key signalling events on sites undergoing chromatin structure modulation. PAR is generated locally in response to stresses. These include genotoxic stress but also differentiation signals, metabolic and hormonal cues. A pictures emerges in which transient PAR formation is essential to orchestrate chromatin remodelling and transcription factors allowing the cell to adapt to alteration in its environment. This review summarizes the diverse factors of ADP-ribosylation in the adaptive regulation of chromatin structure and transcription.
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Affiliation(s)
| | - Kerryanne Crawford
- Sir William Dunn School of Pathology, University of Oxford, S Parks Rd, Oxford OX1 3RE, UK
| | - Ivan Ahel
- Sir William Dunn School of Pathology, University of Oxford, S Parks Rd, Oxford OX1 3RE, UK,.
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29
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Ali SO, Khan FA, Galindo-Campos MA, Yélamos J. Understanding specific functions of PARP-2: new lessons for cancer therapy. Am J Cancer Res 2016; 6:1842-1863. [PMID: 27725894 PMCID: PMC5043098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2016] [Accepted: 08/31/2016] [Indexed: 06/06/2023] Open
Abstract
Poly(ADP-ribosyl)ation (PARylation) is a widespread and highly conserved post-translational modification catalysed by a large family of enzymes called poly(ADP-ribose) polymerases (PARPs). PARylation plays an essential role in various cardinal processes of cellular physiology and recent approvals and breakthrough therapy designations for PARP inhibitors in cancer therapy have sparked great interest in pharmacological targeting of PARP proteins. Although, many PARP inhibitors have been developed, existing compounds display promiscuous inhibition across the PARP superfamily which could lead to unwanted off-target effects. Thus the prospect of isoform-selective inhibition is being increasingly explored and research is now focusing on understanding specific roles of PARP family members. PARP-2, alongside PARP-1 and PARP-3 are the only known DNA damage-dependent PARPs and play critical roles in the DNA damage response, DNA metabolism and chromatin architecture. However, growing evidence shows that PARP-2 plays specific and diverse regulatory roles in cellular physiology, ranging from genomic stability and epigenetics to proliferative signalling and inflammation. The emerging network of PARP-2 target proteins has uncovered wide-ranging functions of the molecule in many cellular processes commonly dysregulated in carcinogenesis. Here, we review novel PARP-2-specific functions in the hallmarks of cancer and consider the implications for the development of isoform-selective inhibitors in chemotherapy. By considering the roles of PARP-2 through the lens of tumorigenesis, we propose PARP-2-selective inhibition as a potentially multipronged attack on cancer physiology.
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Affiliation(s)
- Syed O Ali
- School of Clinical Medicine, University of CambridgeCambridge, UK
| | - Farhaan A Khan
- School of Clinical Medicine, University of CambridgeCambridge, UK
| | - Miguel A Galindo-Campos
- Department of Immunology, Cancer Research Program, Institut Hospital del Mar d’Investigacions Mèdiques (IMIM)Barcelona, Spain
| | - José Yélamos
- Department of Immunology, Cancer Research Program, Institut Hospital del Mar d’Investigacions Mèdiques (IMIM)Barcelona, Spain
- CIBERehdSpain
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30
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Rybaczek D. Hydroxyurea-induced replication stress causes poly(ADP-ribose) polymerase-2 accumulation and changes its intranuclear location in root meristems of Vicia faba. JOURNAL OF PLANT PHYSIOLOGY 2016; 198:89-102. [PMID: 27155387 DOI: 10.1016/j.jplph.2016.03.020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2015] [Revised: 03/29/2016] [Accepted: 03/30/2016] [Indexed: 06/05/2023]
Abstract
Replication stress induced by 24 and 48h exposure to 2.5mM hydroxyurea (HU) increased the activity of poly(ADP-ribose) polymerase-2 (PARP-2; EC 2.4.2.30) in root meristem cells of Vicia faba. An increase in the number of PARP-2 foci was accompanied by their delocalization from peripheral areas to the interior of the nucleus. Our results indicate that the increase in PARP-2 was connected with an increase in S139-phosphorylated H2AX histones. The findings suggest the possible role of PARP-2 in replication stress. We also confirm that the intranuclear location of PARP-2 depends on the duration of HU-induced replication stress, confirming the role of PARP-2 as an indicator of stress intensity. Finally, we conclude that the more intense the HU-mediated replication stress, the greater the probability of PARP-2 activation or H2AXS139 phosphorylation, but also the greater the chance of increasing the efficiency of repair processes and a return to normal cell cycle progression.
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Affiliation(s)
- Dorota Rybaczek
- Department of Cytophysiology, Institute of Experimental Biology, Faculty of Biology and Environmental Protection, University of Łódź, Pomorska 141/143, 90236 Łódź, Poland.
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31
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Ghosh R, Roy S, Kamyab J, Danzter F, Franco S. Common and unique genetic interactions of the poly(ADP-ribose) polymerases PARP1 and PARP2 with DNA double-strand break repair pathways. DNA Repair (Amst) 2016; 45:56-62. [PMID: 27373144 DOI: 10.1016/j.dnarep.2016.06.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Revised: 06/01/2016] [Accepted: 06/02/2016] [Indexed: 12/17/2022]
Abstract
In mammalian cells, chromatin poly(ADP-ribos)ylation (PARylation) at sites of DNA Double-Strand Breaks (DSBs) is mediated by two highly related enzymes, PARP1 and PARP2. However, enzyme-specific genetic interactions with other DSB repair factors remain largely undefined. In this context, it was previously shown that mice lacking PARP1 and H2AX, a histone variant that promotes DSB repair throughout the cell cycle, or the core nonhomologous end-joining (NHEJ) factor Ku80 are not viable, while mice lacking PARP1 and the noncore NHEJ factor DNA-PKcs are severely growth retarded and markedly lymphoma-prone. Here, we have examined the requirement for PARP2 in these backgrounds. We find that, like PARP1, PARP2 is essential for viability in mice lacking H2AX. Moreover, treatment of H2AX-deficient primary fibroblasts or B lymphocytes with PARP inhibitors leads to activation of the G2/M checkpoint and accumulation of chromatid-type breaks in a lineage- and gene-dose dependent manner. In marked contrast to PARP1, loss of PARP2 does not result in additional phenotypes in growth, development or tumorigenesis in mice lacking either Ku80 or DNA-PKcs. Altogether these findings highlight specific nonoverlapping functions of PARP1 and PARP2 at H2AX-deficient chromatin during replicative phases of the cell cycle and uncover a unique requirement for PARP1 in NHEJ-deficient cells.
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Affiliation(s)
- Rajib Ghosh
- Department of Radiation Oncology and Molecular Radiation Sciences; Johns Hopkins School of Medicine, Baltimore, MD 21287, United States
| | - Sanchita Roy
- Department of Radiation Oncology and Molecular Radiation Sciences; Johns Hopkins School of Medicine, Baltimore, MD 21287, United States
| | - Johan Kamyab
- Department of Radiation Oncology and Molecular Radiation Sciences; Johns Hopkins School of Medicine, Baltimore, MD 21287, United States
| | - Francoise Danzter
- Biotechnology and Cell Signaling Unit, University of Strasbourg, 67412 Illkirch, France
| | - Sonia Franco
- Department of Radiation Oncology and Molecular Radiation Sciences; Johns Hopkins School of Medicine, Baltimore, MD 21287, United States
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PIAS1-mediated sumoylation promotes STUbL-dependent proteasomal degradation of the human telomeric protein TRF2. FEBS Lett 2015; 589:3277-86. [PMID: 26450775 DOI: 10.1016/j.febslet.2015.09.030] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Revised: 09/28/2015] [Accepted: 09/30/2015] [Indexed: 01/25/2023]
Abstract
The human telomeric protein TRF2 protects chromosome ends by facilitating their organization into the protective capping structure. Here we show that the stability of TRF2 is regulated via modification by the small ubiquitin-like modifiers (SUMO). TRF2 specifically interacts with and is sumoylated by PIAS1 in mammalian cells. The proteasome inhibitor stabilizes SUMO-conjugated TRF2 without affecting the level of unmodified TRF2, suggesting that SUMO conjugation is required for proteasomal degradation of TRF2. We also show that RNF4, a mammalian SUMO-targeted ubiquitin ligase, interacts with TRF2 in a SUMO-dependent manner and preferentially targets SUMO-conjugated TRF2 for ubiquitination. Collectively, our data demonstrate that the PIAS1-mediated sumoylation status of TRF2 serves as a molecular switch that controls the level of TRF2 at telomeres.
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Saquilabon Cruz GM, Kong X, Silva BA, Khatibzadeh N, Thai R, Berns MW, Yokomori K. Femtosecond near-infrared laser microirradiation reveals a crucial role for PARP signaling on factor assemblies at DNA damage sites. Nucleic Acids Res 2015; 44:e27. [PMID: 26424850 PMCID: PMC4756852 DOI: 10.1093/nar/gkv976] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2015] [Accepted: 09/18/2015] [Indexed: 01/04/2023] Open
Abstract
Laser microirradiation is a powerful tool for real-time single-cell analysis of the DNA damage response (DDR). It is often found, however, that factor recruitment or modification profiles vary depending on the laser system employed. This is likely due to an incomplete understanding of how laser conditions/dosages affect the amounts and types of damage and the DDR. We compared different irradiation conditions using a femtosecond near-infrared laser and found distinct damage site recruitment thresholds for 53BP1 and TRF2 correlating with the dose-dependent increase of strand breaks and damage complexity. Low input-power microirradiation that induces relatively simple strand breaks led to robust recruitment of 53BP1 but not TRF2. In contrast, increased strand breaks with complex damage including crosslinking and base damage generated by high input-power microirradiation resulted in TRF2 recruitment to damage sites with no 53BP1 clustering. We found that poly(ADP-ribose) polymerase (PARP) activation distinguishes between the two damage states and that PARP activation is essential for rapid TRF2 recruitment while suppressing 53BP1 accumulation at damage sites. Thus, our results reveal that careful titration of laser irradiation conditions allows induction of varying amounts and complexities of DNA damage that are gauged by differential PARP activation regulating protein assembly at the damage site.
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Affiliation(s)
- Gladys Mae Saquilabon Cruz
- Beckman Laser Institute and Medical Clinic, University of California, Irvine, 1002 Health Sciences Road East, Irvine, CA 92612, USA
| | - Xiangduo Kong
- Department of Biological Chemistry, School of Medicine, University of California, Irvine, CA 92697-1700, USA
| | - Bárbara Alcaraz Silva
- Beckman Laser Institute and Medical Clinic, University of California, Irvine, 1002 Health Sciences Road East, Irvine, CA 92612, USA Department of Developmental and Cell Biology, School of Biological Sciences, University of California, Irvine, CA 92617, USA
| | - Nima Khatibzadeh
- Beckman Laser Institute and Medical Clinic, University of California, Irvine, 1002 Health Sciences Road East, Irvine, CA 92612, USA
| | - Ryan Thai
- Department of Biological Chemistry, School of Medicine, University of California, Irvine, CA 92697-1700, USA
| | - Michael W Berns
- Beckman Laser Institute and Medical Clinic, University of California, Irvine, 1002 Health Sciences Road East, Irvine, CA 92612, USA Department of Developmental and Cell Biology, School of Biological Sciences, University of California, Irvine, CA 92617, USA Department of Biomedical Engineering and Surgery, University of California, Irvine, CA 92617, USA
| | - Kyoko Yokomori
- Department of Biological Chemistry, School of Medicine, University of California, Irvine, CA 92697-1700, USA
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34
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RecQ helicases and PARP1 team up in maintaining genome integrity. Ageing Res Rev 2015; 23:12-28. [PMID: 25555679 DOI: 10.1016/j.arr.2014.12.006] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2014] [Revised: 12/18/2014] [Accepted: 12/22/2014] [Indexed: 01/04/2023]
Abstract
Genome instability represents a primary hallmark of aging and cancer. RecQL helicases (i.e., RECQL1, WRN, BLM, RECQL4, RECQL5) as well as poly(ADP-ribose) polymerases (PARPs, in particular PARP1) represent two central quality control systems to preserve genome integrity in mammalian cells. Consistently, both enzymatic families have been linked to mechanisms of aging and carcinogenesis in mice and humans. This is in accordance with clinical and epidemiological findings demonstrating that defects in three RecQL helicases, i.e., WRN, BLM, RECQL4, are related to human progeroid and cancer predisposition syndromes, i.e., Werner, Bloom, and Rothmund Thomson syndrome, respectively. Moreover, PARP1 hypomorphy is associated with a higher risk for certain types of cancer. On a molecular level, RecQL helicases and PARP1 are involved in the control of DNA repair, telomere maintenance, and replicative stress. Notably, over the last decade, it became apparent that all five RecQL helicases physically or functionally interact with PARP1 and/or its enzymatic product poly(ADP-ribose) (PAR). Furthermore, a profound body of evidence revealed that the cooperative function of RECQLs and PARP1 represents an important factor for maintaining genome integrity. In this review, we summarize the status quo of this molecular cooperation and discuss open questions that provide a basis for future studies to dissect the cooperative functions of RecQL helicases and PARP1 in aging and carcinogenesis.
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Yélamos J, Galindo M, Navarro J, Albanell J, Rovira A, Rojo F, Oliver J. Enhancing tumor-targeting monoclonal antibodies therapy by PARP inhibitors. Oncoimmunology 2015; 5:e1065370. [PMID: 26942084 DOI: 10.1080/2162402x.2015.1065370] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2015] [Revised: 06/16/2015] [Accepted: 06/17/2015] [Indexed: 12/17/2022] Open
Abstract
Monoclonal antibodies (mAbs) have become a successful therapeutic approach in cancer. However, some patients do not achieve long-term clinical benefit and most mAbs only exert modest effects as monotherapies. Therefore, combinations with chemotherapy are currently being investigated. Emerging studies have shown a synergistic therapeutic effect of PARP inhibitors and mAbs in cancer. PARP enzymes catalytically cleave β-NAD+ and transfer the ADP-ribose moiety to acceptor proteins, modifying their function. In here, we update recent data about the therapeutic effect of the combination of PARP inhibitors with mAbs in cancer treatment and discuss the molecular mechanisms involved in this synergy.
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Affiliation(s)
- José Yélamos
- Cancer Research Program, Hospital del Mar Medical Research Institute (IMIM), Barcelona, Spain; Department of Immunology, Hospital del Mar, Barcelona, Spain; Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), Madrid, Spain
| | - Miguel Galindo
- Cancer Research Program, Hospital del Mar Medical Research Institute (IMIM) , Barcelona, Spain
| | - Judith Navarro
- Cancer Research Program, Hospital del Mar Medical Research Institute (IMIM) , Barcelona, Spain
| | - Joan Albanell
- Cancer Research Program, Hospital del Mar Medical Research Institute (IMIM), Barcelona, Spain; Department of Oncology, Hospital del Mar, Barcelona, Spain
| | - Ana Rovira
- Cancer Research Program, Hospital del Mar Medical Research Institute (IMIM), Barcelona, Spain; Department of Oncology, Hospital del Mar, Barcelona, Spain
| | - Federico Rojo
- Cancer Research Program, Hospital del Mar Medical Research Institute (IMIM), Barcelona, Spain; Department of Patology, IIS Fundación Jiménez Díaz, Madrid, Spain
| | - Javier Oliver
- Department of Cell Biology and Immunology; Instituto de Parasitología y Biomedicina López Neyra , Granada, Spain
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Osterwald S, Deeg KI, Chung I, Parisotto D, Wörz S, Rohr K, Erfle H, Rippe K. PML induces compaction, TRF2 depletion and DNA damage signaling at telomeres and promotes their alternative lengthening. J Cell Sci 2015; 128:1887-1900. [DOI: 10.1242/jcs.148296] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/30/2023] Open
Abstract
ABSTRACT
The alternative lengthening of telomeres (ALT) mechanism allows cancer cells to escape senescence and apoptosis in the absence of active telomerase. A characteristic feature of this pathway is the assembly of ALT-associated promyelocytic leukemia (PML) nuclear bodies (APBs) at telomeres. Here, we dissected the role of APBs in a human ALT cell line by performing an RNA interference screen using an automated 3D fluorescence microscopy platform and advanced 3D image analysis. We identified 29 proteins that affected APB formation, which included proteins involved in telomere and chromatin organization, protein sumoylation and DNA repair. By integrating and extending these findings, we found that APB formation induced clustering of telomere repeats, telomere compaction and concomitant depletion of the shelterin protein TRF2 (also known as TERF2). These APB-dependent changes correlated with the induction of a DNA damage response at telomeres in APBs as evident by a strong enrichment of the phosphorylated form of the ataxia telangiectasia mutated (ATM) kinase. Accordingly, we propose that APBs promote telomere maintenance by inducing a DNA damage response in ALT-positive tumor cells through changing the telomeric chromatin state to trigger ATM phosphorylation.
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Affiliation(s)
- Sarah Osterwald
- Research Group Genome Organization & Function, Deutsches Krebsforschungszentrum (DKFZ) & BioQuant, 69120 Heidelberg, Germany
| | - Katharina I. Deeg
- Research Group Genome Organization & Function, Deutsches Krebsforschungszentrum (DKFZ) & BioQuant, 69120 Heidelberg, Germany
| | - Inn Chung
- Research Group Genome Organization & Function, Deutsches Krebsforschungszentrum (DKFZ) & BioQuant, 69120 Heidelberg, Germany
| | - Daniel Parisotto
- Research Group Genome Organization & Function, Deutsches Krebsforschungszentrum (DKFZ) & BioQuant, 69120 Heidelberg, Germany
| | - Stefan Wörz
- Department of Bioinformatics and Functional Genomics, Biomedical Computer Vision Group, University of Heidelberg & DKFZ, BioQuant, IPMB, 69120 Heidelberg, Germany
| | - Karl Rohr
- Department of Bioinformatics and Functional Genomics, Biomedical Computer Vision Group, University of Heidelberg & DKFZ, BioQuant, IPMB, 69120 Heidelberg, Germany
| | - Holger Erfle
- ViroQuant-CellNetworks RNAi Screening Facility, University of Heidelberg & BioQuant, 69120 Heidelberg, Germany
| | - Karsten Rippe
- Research Group Genome Organization & Function, Deutsches Krebsforschungszentrum (DKFZ) & BioQuant, 69120 Heidelberg, Germany
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37
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Hottiger MO. Nuclear ADP-Ribosylation and Its Role in Chromatin Plasticity, Cell Differentiation, and Epigenetics. Annu Rev Biochem 2015; 84:227-63. [PMID: 25747399 DOI: 10.1146/annurev-biochem-060614-034506] [Citation(s) in RCA: 169] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Protein ADP-ribosylation is an ancient posttranslational modification with high biochemical complexity. It alters the function of modified proteins or provides a scaffold for the recruitment of other proteins and thus regulates several cellular processes. ADP-ribosylation is governed by ADP-ribosyltransferases and a subclass of sirtuins (writers), is sensed by proteins that contain binding modules (readers) that recognize specific parts of the ADP-ribosyl posttranslational modification, and is removed by ADP-ribosylhydrolases (erasers). The large amount of experimental data generated and technical progress made in the last decade have significantly advanced our knowledge of the function of ADP-ribosylation at the molecular level. This review summarizes the current knowledge of nuclear ADP-ribosylation reactions and their role in chromatin plasticity, cell differentiation, and epigenetics and discusses current progress and future perspectives.
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Affiliation(s)
- Michael O Hottiger
- Institute of Veterinary Biochemistry and Molecular Biology, University of Zurich, 8057 Zurich, Switzerland;
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38
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Bosch-Presegué L, Vaquero A. Sirtuin-dependent epigenetic regulation in the maintenance of genome integrity. FEBS J 2014; 282:1745-67. [DOI: 10.1111/febs.13053] [Citation(s) in RCA: 87] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2014] [Revised: 09/09/2014] [Accepted: 09/12/2014] [Indexed: 12/12/2022]
Affiliation(s)
- Laia Bosch-Presegué
- Chromatin Biology Laboratory; Cancer Epigenetics and Biology Program; Institut d'Investigació Biomèdica de Bellvitge; Barcelona Spain
| | - Alejandro Vaquero
- Chromatin Biology Laboratory; Cancer Epigenetics and Biology Program; Institut d'Investigació Biomèdica de Bellvitge; Barcelona Spain
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Bower BD, Griffith JD. TRF1 and TRF2 differentially modulate Rad51-mediated telomeric and nontelomeric displacement loop formation in vitro. Biochemistry 2014; 53:5485-95. [PMID: 25115914 PMCID: PMC4151696 DOI: 10.1021/bi5006249] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
A growing
body of literature suggests that the homologous recombination/repair
(HR) pathway cooperates with components of the shelterin complex to
promote both telomere maintenance and nontelomeric HR. This may be
due to the ability of both HR and shelterin proteins to promote strand
invasion, wherein a single-stranded DNA (ssDNA) substrate base pairs
with a homologous double-stranded DNA (dsDNA) template displacing
a loop of ssDNA (D-loop). Rad51 recombinase catalyzes D-loop formation
during HR, and telomere repeat binding factor 2 (TRF2) catalyzes the
formation of a telomeric D-loop that stabilizes a looped structure
in telomeric DNA (t-loop) that may facilitate telomere protection.
We have characterized this functional interaction in vitro using a fluorescent D-loop assay measuring the incorporation of
Cy3-labeled 90-nucleotide telomeric and nontelomeric substrates into
telomeric and nontelomeric plasmid templates. We report that preincubation
of a telomeric template with TRF2 inhibits the ability of Rad51 to
promote telomeric D-loop formation upon preincubation with a telomeric
substrate. This suggests Rad51 does not facilitate t-loop formation
and suggests a mechanism whereby TRF2 can inhibit HR at telomeres.
We also report a TRF2 mutant lacking the dsDNA binding domain promotes
Rad51-mediated nontelomeric D-loop formation, possibly explaining
how TRF2 promotes nontelomeric HR. Finally, we report telomere repeat
binding factor 1 (TRF1) promotes Rad51-mediated telomeric D-loop formation,
which may facilitate HR-mediated replication fork restart and explain
why TRF1 is required for efficient telomere replication.
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Affiliation(s)
- Brian D Bower
- Curriculum in Genetics and Molecular Biology, University of North Carolina , Chapel Hill, North Carolina 27599, United States
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41
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Roper SJ, Chrysanthou S, Senner CE, Sienerth A, Gnan S, Murray A, Masutani M, Latos P, Hemberger M. ADP-ribosyltransferases Parp1 and Parp7 safeguard pluripotency of ES cells. Nucleic Acids Res 2014; 42:8914-27. [PMID: 25034692 PMCID: PMC4132717 DOI: 10.1093/nar/gku591] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Embryonic stem (ES) cells are in a dynamic equilibrium of distinct functional states, characterized by the heterogeneous expression of critical pluripotency factors and regulated by a spectrum of reversible histone modifications. Maintenance of this equilibrium is a hallmark of pluripotency. Here we find that the ADP-ribosyltransferases Parp1 and Parp7 play a critical role in safeguarding this state by occupying key pluripotency genes, notably Nanog, Pou5f1, Sox2, Stella, Tet1 and Zfp42, thereby protecting them from progressive epigenetic repression. In the absence of either Parp1 or Parp7, or upon inhibition of the ADP-ribosylating activity, ES cells exhibit a decrease in ground state pluripotency as they cannot maintain the typical heterogeneity characteristic of the metastable state. As a consequence, they display a higher propensity to differentiate. These findings place Parp1 and Parp7 at the genetic-epigenetic interface of pluripotency networks, fine-tuning the transcriptional heterogeneity and thereby determining the developmental plasticity of ES cells.
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Affiliation(s)
- Stephen J Roper
- Epigenetics Programme, The Babraham Institute, Babraham Research Campus, Cambridge CB22 3AT, UK Centre for Trophoblast Research, University of Cambridge, Downing Street, Cambridge CB2 3EG, UK
| | - Stephanie Chrysanthou
- Epigenetics Programme, The Babraham Institute, Babraham Research Campus, Cambridge CB22 3AT, UK Centre for Trophoblast Research, University of Cambridge, Downing Street, Cambridge CB2 3EG, UK
| | - Claire E Senner
- Epigenetics Programme, The Babraham Institute, Babraham Research Campus, Cambridge CB22 3AT, UK Centre for Trophoblast Research, University of Cambridge, Downing Street, Cambridge CB2 3EG, UK
| | - Arnold Sienerth
- Epigenetics Programme, The Babraham Institute, Babraham Research Campus, Cambridge CB22 3AT, UK Centre for Trophoblast Research, University of Cambridge, Downing Street, Cambridge CB2 3EG, UK
| | - Stefano Gnan
- Epigenetics Programme, The Babraham Institute, Babraham Research Campus, Cambridge CB22 3AT, UK
| | - Alexander Murray
- Epigenetics Programme, The Babraham Institute, Babraham Research Campus, Cambridge CB22 3AT, UK Centre for Trophoblast Research, University of Cambridge, Downing Street, Cambridge CB2 3EG, UK
| | - Mitsuko Masutani
- Division of Genome Stability Research, National Cancer Center Research Institute, 5-1-1 Tsukiji, Chuo-ku, Tokyo 104-0045, Japan
| | - Paulina Latos
- Epigenetics Programme, The Babraham Institute, Babraham Research Campus, Cambridge CB22 3AT, UK Centre for Trophoblast Research, University of Cambridge, Downing Street, Cambridge CB2 3EG, UK
| | - Myriam Hemberger
- Epigenetics Programme, The Babraham Institute, Babraham Research Campus, Cambridge CB22 3AT, UK Centre for Trophoblast Research, University of Cambridge, Downing Street, Cambridge CB2 3EG, UK
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Abstract
Telomeres protect chromosome ends from degradation and inappropriate DNA damage response activation through their association with specific factors. Interestingly, these telomeric factors are able to localize outside telomeric regions, where they can regulate the transcription of genes involved in metabolism, immunity and differentiation. These findings delineate a signalling pathway by which telomeric changes control the ability of their associated factors to regulate transcription. This mechanism is expected to enable a greater diversity of cellular responses that are adapted to specific cell types and telomeric changes, and may therefore represent a pivotal aspect of development, ageing and telomere-mediated diseases.
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De Vos M, El Ramy R, Quénet D, Wolf P, Spada F, Magroun N, Babbio F, Schreiber V, Leonhardt H, Bonapace IM, Dantzer F. Poly(ADP-ribose) polymerase 1 (PARP1) associates with E3 ubiquitin-protein ligase UHRF1 and modulates UHRF1 biological functions. J Biol Chem 2014; 289:16223-38. [PMID: 24782312 DOI: 10.1074/jbc.m113.527424] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Poly(ADP-ribose) polymerase 1 (PARP1, also known as ARTD1) is an abundant nuclear enzyme that plays important roles in DNA repair, gene transcription, and differentiation through the modulation of chromatin structure and function. In this work we identify a physical and functional poly(ADP-ribose)-mediated interaction of PARP1 with the E3 ubiquitin ligase UHRF1 (also known as NP95, ICBP90) that influences two UHRF1-regulated cellular processes. On the one hand, we uncovered a cooperative interplay between PARP1 and UHRF1 in the accumulation of the heterochromatin repressive mark H4K20me3. The absence of PARP1 led to reduced accumulation of H4K20me3 onto pericentric heterochromatin that coincided with abnormally enhanced transcription. The loss of H4K20me3 was rescued by the additional depletion of UHRF1. In contrast, although PARP1 also seemed to facilitate the association of UHRF1 with DNMT1, its absence did not impair the loading of DNMT1 onto heterochromatin or the methylation of pericentric regions, possibly owing to a compensating interaction of DNMT1 with PCNA. On the other hand, we showed that PARP1 controls the UHRF1-mediated ubiquitination of DNMT1 to timely regulate its abundance during S and G2 phase. Together, this report identifies PARP1 as a novel modulator of two UHRF1-regulated heterochromatin-associated events: the accumulation of H4K20me3 and the clearance of DNMT1.
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Affiliation(s)
- Mike De Vos
- From the Poly(ADP-ribosyl)ation and Genome Integrity Group, Equipe Labellisée Ligue Nationale Contre le Cancer, Laboratoire d'Excellence Medalis, Institut de Recherche de l'Ecole de Biotechnologie de Strasbourg, UMR7242, Centre Nationale de la Recherche Scientifique/Université de Strasbourg, Boulevard Sebastien Brant, BP10413, 67412 Illkirch, France
| | - Rosy El Ramy
- From the Poly(ADP-ribosyl)ation and Genome Integrity Group, Equipe Labellisée Ligue Nationale Contre le Cancer, Laboratoire d'Excellence Medalis, Institut de Recherche de l'Ecole de Biotechnologie de Strasbourg, UMR7242, Centre Nationale de la Recherche Scientifique/Université de Strasbourg, Boulevard Sebastien Brant, BP10413, 67412 Illkirch, France
| | - Delphine Quénet
- From the Poly(ADP-ribosyl)ation and Genome Integrity Group, Equipe Labellisée Ligue Nationale Contre le Cancer, Laboratoire d'Excellence Medalis, Institut de Recherche de l'Ecole de Biotechnologie de Strasbourg, UMR7242, Centre Nationale de la Recherche Scientifique/Université de Strasbourg, Boulevard Sebastien Brant, BP10413, 67412 Illkirch, France
| | - Patricia Wolf
- the Department of Biology II, Center for Integrated Protein Science Munich, Ludwig Maximilians University Munich, 82152 Planegg-Martinsried, Germany, and
| | - Fabio Spada
- the Department of Biology II, Center for Integrated Protein Science Munich, Ludwig Maximilians University Munich, 82152 Planegg-Martinsried, Germany, and
| | - Najat Magroun
- From the Poly(ADP-ribosyl)ation and Genome Integrity Group, Equipe Labellisée Ligue Nationale Contre le Cancer, Laboratoire d'Excellence Medalis, Institut de Recherche de l'Ecole de Biotechnologie de Strasbourg, UMR7242, Centre Nationale de la Recherche Scientifique/Université de Strasbourg, Boulevard Sebastien Brant, BP10413, 67412 Illkirch, France
| | - Federica Babbio
- the Department of Structural and Functional Biology, University of Insubria, Via Alberto da Giussano 12, 21052 Busto Arsizio, Italy
| | - Valérie Schreiber
- From the Poly(ADP-ribosyl)ation and Genome Integrity Group, Equipe Labellisée Ligue Nationale Contre le Cancer, Laboratoire d'Excellence Medalis, Institut de Recherche de l'Ecole de Biotechnologie de Strasbourg, UMR7242, Centre Nationale de la Recherche Scientifique/Université de Strasbourg, Boulevard Sebastien Brant, BP10413, 67412 Illkirch, France
| | - Heinrich Leonhardt
- the Department of Biology II, Center for Integrated Protein Science Munich, Ludwig Maximilians University Munich, 82152 Planegg-Martinsried, Germany, and
| | - Ian Marc Bonapace
- the Department of Structural and Functional Biology, University of Insubria, Via Alberto da Giussano 12, 21052 Busto Arsizio, Italy
| | - Françoise Dantzer
- From the Poly(ADP-ribosyl)ation and Genome Integrity Group, Equipe Labellisée Ligue Nationale Contre le Cancer, Laboratoire d'Excellence Medalis, Institut de Recherche de l'Ecole de Biotechnologie de Strasbourg, UMR7242, Centre Nationale de la Recherche Scientifique/Université de Strasbourg, Boulevard Sebastien Brant, BP10413, 67412 Illkirch, France,
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44
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Mitchell TRH, Zhu XD. Methylated TRF2 associates with the nuclear matrix and serves as a potential biomarker for cellular senescence. Aging (Albany NY) 2014; 6:248-63. [PMID: 24721747 PMCID: PMC4032793 DOI: 10.18632/aging.100650] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2013] [Accepted: 04/03/2014] [Indexed: 11/25/2022]
Abstract
Methylation of N-terminal arginines of the shelterin component TRF2 is important for cellular proliferation. While TRF2 is found at telomeres, where it plays an essential role in maintaining telomere integrity, little is known about the cellular localization of methylated TRF2. Here we report that the majority of methylated TRF2 is resistant to extraction by high salt buffer and DNase I treatment, indicating that methylated TRF2 is tightly associated with the nuclear matrix. We show that methylated TRF2 drastically alters its nuclear staining as normal human primary fibroblast cells approach and enter replicative senescence. This altered nuclear staining, which is found to be overwhelmingly associated with misshapen nuclei and abnormal nuclear matrix folds, can be suppressed by hTERT and it is barely detectable in transformed and cancer cell lines. We find that dysfunctional telomeres and DNA damage, both of which are potent inducers of cellular senescence, promote the altered nuclear staining of methylated TRF2, which is dependent upon the ATM-mediated DNA damage response. Collectively, these results suggest that the altered nuclear staining of methylated TRF2 may represent ATM-mediated nuclear structural alteration associated with cellular senescence. Our data further imply that methylated TRF2 can serve as a potential biomarker for cellular senescence.
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Affiliation(s)
- Taylor R H Mitchell
- Department of Biology, McMaster University, Hamilton, Ontario, Canada L8S 4K1
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45
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Beck C, Boehler C, Guirouilh Barbat J, Bonnet ME, Illuzzi G, Ronde P, Gauthier LR, Magroun N, Rajendran A, Lopez BS, Scully R, Boussin FD, Schreiber V, Dantzer F. PARP3 affects the relative contribution of homologous recombination and nonhomologous end-joining pathways. Nucleic Acids Res 2014; 42:5616-32. [PMID: 24598253 PMCID: PMC4027158 DOI: 10.1093/nar/gku174] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
The repair of toxic double-strand breaks (DSB) is critical for the maintenance of genome integrity. The major mechanisms that cope with DSB are: homologous recombination (HR) and classical or alternative nonhomologous end joining (C-NHEJ versus A-EJ). Because these pathways compete for the repair of DSB, the choice of the appropriate repair pathway is pivotal. Among the mechanisms that influence this choice, deoxyribonucleic acid (DNA) end resection plays a critical role by driving cells to HR, while accurate C-NHEJ is suppressed. Furthermore, end resection promotes error-prone A-EJ. Increasing evidence define Poly(ADP-ribose) polymerase 3 (PARP3, also known as ARTD3) as an important player in cellular response to DSB. In this work, we reveal a specific feature of PARP3 that together with Ku80 limits DNA end resection and thereby helps in making the choice between HR and NHEJ pathways. PARP3 interacts with and PARylates Ku70/Ku80. The depletion of PARP3 impairs the recruitment of YFP-Ku80 to laser-induced DNA damage sites and induces an imbalance between BRCA1 and 53BP1. Both events result in compromised accurate C-NHEJ and a concomitant increase in DNA end resection. Nevertheless, HR is significantly reduced upon PARP3 silencing while the enhanced end resection causes mutagenic deletions during A-EJ. As a result, the absence of PARP3 confers hypersensitivity to anti-tumoral drugs generating DSB.
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Affiliation(s)
- Carole Beck
- Poly(ADP-ribosyl)ation and Genome Integrity, Laboratoire d'Excellence Medalis, Equipe labellisée Ligue Nationale Contre Le Cancer, UMR7242, Centre Nationale de la Recherche Scientifique/Université de Strasbourg, Institut de Recherche de l'Ecole de Biotechnologie de Strasbourg, 300 bld. S. Brant, BP10413, 67412 Illkirch, France
| | - Christian Boehler
- Poly(ADP-ribosyl)ation and Genome Integrity, Laboratoire d'Excellence Medalis, Equipe labellisée Ligue Nationale Contre Le Cancer, UMR7242, Centre Nationale de la Recherche Scientifique/Université de Strasbourg, Institut de Recherche de l'Ecole de Biotechnologie de Strasbourg, 300 bld. S. Brant, BP10413, 67412 Illkirch, France
| | - Josée Guirouilh Barbat
- Université Paris Sud, CNRS UMR8200, Institut de Cancérologie Gustave-Roussy, 114 rue Edouard Vaillant, 94805 Villejuif, France
| | - Marie-Elise Bonnet
- Poly(ADP-ribosyl)ation and Genome Integrity, Laboratoire d'Excellence Medalis, Equipe labellisée Ligue Nationale Contre Le Cancer, UMR7242, Centre Nationale de la Recherche Scientifique/Université de Strasbourg, Institut de Recherche de l'Ecole de Biotechnologie de Strasbourg, 300 bld. S. Brant, BP10413, 67412 Illkirch, France
| | - Giuditta Illuzzi
- Poly(ADP-ribosyl)ation and Genome Integrity, Laboratoire d'Excellence Medalis, Equipe labellisée Ligue Nationale Contre Le Cancer, UMR7242, Centre Nationale de la Recherche Scientifique/Université de Strasbourg, Institut de Recherche de l'Ecole de Biotechnologie de Strasbourg, 300 bld. S. Brant, BP10413, 67412 Illkirch, France
| | - Philippe Ronde
- Laboratoire de biophotonique et pharmacologie, UMR 7213, Centre Nationale de la Recherche Scientifique/Université de Strasbourg, Faculté de pharmacie, 74 route du Rhin, 67401 Illkirch, France
| | - Laurent R Gauthier
- CEA DSV iRCM SCSR, Laboratoire de radiopathologie, INSERM, U967, 92265 Fontenay-aux-Roses, France
| | - Najat Magroun
- Poly(ADP-ribosyl)ation and Genome Integrity, Laboratoire d'Excellence Medalis, Equipe labellisée Ligue Nationale Contre Le Cancer, UMR7242, Centre Nationale de la Recherche Scientifique/Université de Strasbourg, Institut de Recherche de l'Ecole de Biotechnologie de Strasbourg, 300 bld. S. Brant, BP10413, 67412 Illkirch, France
| | - Anbazhagan Rajendran
- Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, 330 Brookline Avenue, Boston, MA 02215, USA
| | - Bernard S Lopez
- Université Paris Sud, CNRS UMR8200, Institut de Cancérologie Gustave-Roussy, 114 rue Edouard Vaillant, 94805 Villejuif, France
| | - Ralph Scully
- Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, 330 Brookline Avenue, Boston, MA 02215, USA
| | - François D Boussin
- CEA DSV iRCM SCSR, Laboratoire de radiopathologie, INSERM, U967, 92265 Fontenay-aux-Roses, France
| | - Valérie Schreiber
- Poly(ADP-ribosyl)ation and Genome Integrity, Laboratoire d'Excellence Medalis, Equipe labellisée Ligue Nationale Contre Le Cancer, UMR7242, Centre Nationale de la Recherche Scientifique/Université de Strasbourg, Institut de Recherche de l'Ecole de Biotechnologie de Strasbourg, 300 bld. S. Brant, BP10413, 67412 Illkirch, France
| | - Françoise Dantzer
- Poly(ADP-ribosyl)ation and Genome Integrity, Laboratoire d'Excellence Medalis, Equipe labellisée Ligue Nationale Contre Le Cancer, UMR7242, Centre Nationale de la Recherche Scientifique/Université de Strasbourg, Institut de Recherche de l'Ecole de Biotechnologie de Strasbourg, 300 bld. S. Brant, BP10413, 67412 Illkirch, France
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Morales J, Li L, Fattah FJ, Dong Y, Bey EA, Patel M, Gao J, Boothman DA. Review of poly (ADP-ribose) polymerase (PARP) mechanisms of action and rationale for targeting in cancer and other diseases. Crit Rev Eukaryot Gene Expr 2014; 24:15-28. [PMID: 24579667 DOI: 10.1615/critreveukaryotgeneexpr.2013006875] [Citation(s) in RCA: 398] [Impact Index Per Article: 39.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Poly (ADP-ribose) polymerases (PARPs) are a family of related enzymes that share the ability to catalyze the transfer of ADP-ribose to target proteins. PARPs play an important role in various cellular processes, including modulation of chromatin structure, transcription, replication, recombination, and DNA repair. The role of PARP proteins in DNA repair is of particular interest, in view of the finding that certain tumors defective in homologous recombination mechanisms, may rely on PARP-mediated DNA repair for survival, and are sensitive to its inhibition. PARP inhibitors may also increase tumor sensitivity to DNA-damaging agents. Clinical trials of PARP inhibitors are investigating the utility of these approaches in cancer. The hyperactivation of PARP has also been shown to result in a specific programmed cell death pathway involving NAD+/ATP depletion, mu-calpain activation, loss of mitochondrial membrane potential, and the release of apoptosis inducing factor. Hyperactivation of the PARP pathway may be exploited to selectively kill cancer cells. Other PARP forms, including tankyrase 1 (PARP 5a), which plays an important role in enhancing telomere elongation by telomerase, have been found to be potential targets in cancer therapy. The PARP pathway and its inhibition thus offers a number of opportunities for therapeutic intervention in both cancer and other disease states.
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Affiliation(s)
- Julio Morales
- Simmons Cancer Center, University of Texas Southwestern Medical Center, Dallas, TX 75399
| | - Longshan Li
- Simmons Cancer Center, University of Texas Southwestern Medical Center, Dallas, TX 75399
| | - Farjana J Fattah
- Simmons Cancer Center, University of Texas Southwestern Medical Center, Dallas, TX 75399
| | - Ying Dong
- Simmons Cancer Center, University of Texas Southwestern Medical Center, Dallas, TX 75399
| | - Erik A Bey
- Department of Basic Pharmaceutical Sciences & Mary Bapp Randolph, West Virginia University, Morgantown, WV 26506
| | - Malina Patel
- Simmons Cancer Center, University of Texas Southwestern Medical Center, Dallas, TX 75399
| | - Jinming Gao
- Simmons Cancer Center, University of Texas Southwestern Medical Center, Dallas, TX 75399
| | - David A Boothman
- Simmons Cancer Center, University of Texas Southwestern Medical Center, Dallas, TX 75399
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47
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Boltz KA, Jasti M, Townley JM, Shippen DE. Analysis of poly(ADP-Ribose) polymerases in Arabidopsis telomere biology. PLoS One 2014; 9:e88872. [PMID: 24551184 PMCID: PMC3923816 DOI: 10.1371/journal.pone.0088872] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2013] [Accepted: 01/17/2014] [Indexed: 11/22/2022] Open
Abstract
Maintaining the length of the telomere tract at chromosome ends is a complex process vital to normal cell division. Telomere length is controlled through the action of telomerase as well as a cadre of telomere-associated proteins that facilitate replication of the chromosome end and protect it from eliciting a DNA damage response. In vertebrates, multiple poly(ADP-ribose) polymerases (PARPs) have been implicated in the regulation of telomere length, telomerase activity and chromosome end protection. Here we investigate the role of PARPs in plant telomere biology. We analyzed Arabidopsis thaliana mutants null for PARP1 and PARP2 as well as plants treated with the PARP competitive inhibitor 3-AB. Plants deficient in PARP were hypersensitive to genotoxic stress, and expression of PARP1 and PARP2 mRNA was elevated in response to MMS or zeocin treatment or by the loss of telomerase. Additionally, PARP1 mRNA was induced in parp2 mutants, and conversely, PARP2 mRNA was induced in parp1 mutants. PARP3 mRNA, by contrast, was elevated in both parp1 and parp2 mutants, but not in seedlings treated with 3-AB or zeocin. PARP mutants and 3-AB treated plants displayed robust telomerase activity, no significant changes in telomere length, and no end-to-end chromosome fusions. Although there remains a possibility that PARPs play a role in Arabidopsis telomere biology, these findings argue that the contribution is a minor one.
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Affiliation(s)
- Kara A. Boltz
- Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas, United States of America
| | - Madhu Jasti
- Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas, United States of America
| | - Jennifer M. Townley
- Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas, United States of America
| | - Dorothy E. Shippen
- Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas, United States of America
- * E-mail:
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48
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Petrova NV, Velichko AK, Kantidze OL, Razin SV. Heat shock-induced dissociation of TRF2 from telomeres does not initiate a telomere-dependent DNA damage response. Cell Biol Int 2014; 38:675-81. [PMID: 24474557 DOI: 10.1002/cbin.10252] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2013] [Accepted: 01/02/2014] [Indexed: 01/12/2023]
Abstract
Telomeric repeat binding factor 2 (TRF2) is a well-studied shelterin complex subunit that plays a major role in the protection of chomosome ends and the prevention of the telomere-associated DNA damage response. We show that heat shock induces the dissociation of TRF2 from telomeres in human primary and cancer cell cultures. TRF2 is not simply degraded in response to heat shock, but redistributed thoughout the nucleoplasm. This TRF2 depletion/redistribution does not initiate the DNA damage response at chomosome termini.
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Affiliation(s)
- Nadezhda V Petrova
- Laboratory of Structural and Functional Organization of Chomosomes, Institute of Gene Biology, Russian Academy of Sciences, Moscow, Russia; Department of Molecular Biology, Lomonosov Moscow State University, Moscow, Russia
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Shim G, Ricoul M, Hempel WM, Azzam EI, Sabatier L. Crosstalk between telomere maintenance and radiation effects: A key player in the process of radiation-induced carcinogenesis. MUTATION RESEARCH. REVIEWS IN MUTATION RESEARCH 2014; 760:S1383-5742(14)00002-7. [PMID: 24486376 PMCID: PMC4119099 DOI: 10.1016/j.mrrev.2014.01.001] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2013] [Revised: 01/14/2014] [Accepted: 01/22/2014] [Indexed: 02/06/2023]
Abstract
It is well established that ionizing radiation induces chromosomal damage, both following direct radiation exposure and via non-targeted (bystander) effects, activating DNA damage repair pathways, of which the proteins are closely linked to telomeric proteins and telomere maintenance. Long-term propagation of this radiation-induced chromosomal damage during cell proliferation results in chromosomal instability. Many studies have shown the link between radiation exposure and radiation-induced changes in oxidative stress and DNA damage repair in both targeted and non-targeted cells. However, the effect of these factors on telomeres, long established as guardians of the genome, still remains to be clarified. In this review, we will focus on what is known about how telomeres are affected by exposure to low- and high-LET ionizing radiation and during proliferation, and will discuss how telomeres may be a key player in the process of radiation-induced carcinogenesis.
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50
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Zhu Z, Jin J, Xue N, Song X, Chen X. Development and validation of high-throughput screening assays for poly(ADP-ribose) polymerase-2 inhibitors. Anal Biochem 2013; 449:188-94. [PMID: 24382396 DOI: 10.1016/j.ab.2013.12.028] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2013] [Revised: 12/09/2013] [Accepted: 12/20/2013] [Indexed: 11/24/2022]
Abstract
Poly(ADP-ribose) polymerase-1 and -2 (PARP1/2) are two key facilitators of DNA repair and are implicated in the pathogenesis of cancers and several chronic diseases. Inhibitors of PARP1/2 have shown powerful therapeutic effects in the treatment of cancer, cerebral ischemia, and inflammation. In addition, evidence from several studies suggests unique functions for PARP2 in genome surveillance, spermatogenesis, adipogenesis, and T cell development, and PARP2-specific inhibitors might have many other applications. To acquire PARP1/2 inhibitors, many high-throughput screening (HTS) assays for PARP1 inhibitors have been developed. However, detailed screening assays for PARP2 inhibitors have not been reported. Herein, three HTS assays for PARP2 inhibitors were developed and validated with reference inhibitors in each case. The results suggest that the HTS assays for PARP2 inhibitors using chemical quantification of NAD(+), biotin-based quantification of PAR, and ELISA quantification of PAR are sensitive, robust, and cost effective.
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Affiliation(s)
- Zhixiang Zhu
- Department of Pharmacology, State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, People's Republic of China
| | - Jing Jin
- Department of Pharmacology, State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, People's Republic of China
| | - Nina Xue
- Department of Pharmacology, State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, People's Republic of China
| | - Xiuyun Song
- Department of Pharmacology, State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, People's Republic of China
| | - Xiaoguang Chen
- Department of Pharmacology, State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, People's Republic of China.
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