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Thakur A, Rana M, Ritika, Mathew J, Nepali S, Pan CH, Liou JP, Nepali K. Small molecule tractable PARP inhibitors: Scaffold construction approaches, mechanistic insights and structure activity relationship. Bioorg Chem 2023; 141:106893. [PMID: 37783100 DOI: 10.1016/j.bioorg.2023.106893] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Revised: 09/21/2023] [Accepted: 09/25/2023] [Indexed: 10/04/2023]
Abstract
Diverse drug design strategies viz. molecular hybridization, substituent installation, scaffold hopping, isosteric replacement, high-throughput screening, induction and separation of chirality, structure modifications of phytoconstituents and use of structural templates have been exhaustively leveraged in the last decade to load the chemical toolbox of PARP inhibitors. Resultantly, numerous promising scaffolds have been pinpointed that in turn have led to the resuscitation of the credence to PARP inhibitors as cancer therapeutics. This review briefly presents the physiological functions of PARPs, the pharmacokinetics, and pharmacodynamics, and the interaction profiles of FDA-approved PARP inhibitors. Comprehensively covered is the section on the drug design strategies employed by drug discovery enthusiasts for furnishing PARP inhibitors. The impact of structural variations in the template of designed scaffolds on enzymatic and cellular activity (structure-activity relationship studies) has been discussed. The insights gained through the biological evaluation such as profiling of physicochemical properties andin vitroADME properties, PK assessments, and high-dose pharmacology are covered.
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Affiliation(s)
- Amandeep Thakur
- School of Pharmacy, College of Pharmacy, Taipei Medical University, Taipei 110031, Taiwan
| | - Mandeep Rana
- School of Pharmacy, College of Pharmacy, Taipei Medical University, Taipei 110031, Taiwan
| | - Ritika
- College of Medicine, Taipei Medical University, Taipei 110031, Taiwan
| | - Jacob Mathew
- Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 106335, Taiwan
| | - Sanya Nepali
- Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal 576104, India
| | - Chun-Hsu Pan
- School of Pharmacy, College of Pharmacy, Taipei Medical University, Taipei 110031, Taiwan; Ph.D. Program in Drug Discovery and Development Industry, College of Pharmacy, Taipei Medical University, Taiwan
| | - Jing Ping Liou
- School of Pharmacy, College of Pharmacy, Taipei Medical University, Taipei 110031, Taiwan; Ph.D. Program in Drug Discovery and Development Industry, College of Pharmacy, Taipei Medical University, Taiwan
| | - Kunal Nepali
- School of Pharmacy, College of Pharmacy, Taipei Medical University, Taipei 110031, Taiwan; Ph.D. Program in Drug Discovery and Development Industry, College of Pharmacy, Taipei Medical University, Taiwan.
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2
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Krause W. Resistance to prostate cancer treatments. IUBMB Life 2022; 75:390-410. [PMID: 35978491 DOI: 10.1002/iub.2665] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2022] [Accepted: 07/09/2022] [Indexed: 12/14/2022]
Abstract
A review of the current treatment options for prostate cancer and the formation of resistance to these regimens has been compiled including primary, acquired, and cross-resistance. The diversification of the pathways involved and the escape routes the tumor is utilizing have been addressed. Whereas early stages of tumor can be cured, there is no treatment available after a point of no return has been reached, leaving palliative treatment as the only option. The major reasons for this outcome are the heterogeneity of tumors, both inter- and intra-individually and the nearly endless number of escape routes, which the tumor can select to overcome the effects of treatment. This means that more focus should be applied to the individualization of both diagnosis and therapy of prostate cancer. In addition to current treatment options, novel drugs and ongoing clinical trials have been addressed in this review.
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Antitumor effects of pyrrole-imidazole polyamide modified with alkylating agent on prostate cancer cells. Biochem Biophys Res Commun 2022; 623:9-16. [PMID: 35868070 DOI: 10.1016/j.bbrc.2022.07.042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2022] [Accepted: 07/11/2022] [Indexed: 11/21/2022]
Abstract
Androgens and androgen receptor (AR) have a central role in prostate cancer progression by regulating its downstream signaling. Although androgen depletion therapy (ADT) is the primary treatment for most prostate cancers, they acquires resistance to ADT and become castration resistant prostate cancers (CRPC). AR complex formation with multiple transcription factors is important for enhancer activity and transcriptional regulation, which can contribute to cancer progression and resistance to ADT. We previously demonstrated that OCT1 collaborates with AR in prostate cancer, and that a pyrrole-imidazole (PI) polyamide (PIP) targeting OCT1 inhibits cell and castration-resistant tumor growth (Obinata D et al. Oncogene 2016). PIP can bind to DNA non-covalently without a drug delivery system unlike most DNA targeted therapeutics. In the present study, we developed a PIP modified with a DNA alkylating agent, chlorambucil (ChB) (OCT1-PIP-ChB). Then its effect on the growth of prostate cancer LNCaP, 22Rv1, and PC3 cells, pancreatic cancer BxPC3 cells, and colon cancer HCT116 cells, as well as non-cancerous MCF-10A epithelial cells, were analyzed. It was shown that the IC50s of OCT1-PIP-ChB for 22Rv1 and LNCaP were markedly lower compared to other cells, including non-cancerous MCF-10A cells. Comprehensive gene expression analysis of CRPC model 22Rv1 cells treated with IC50 concentrations of OCT1-PIP-ChB revealed that the gene group involved in DNA double-strand break repair was the most enriched among gene sets repressed by OCT1-PIP-ChB treatment. Importantly, in vivo study using 22Rv1 xenografts, we showed that OCT1-PIP-ChB significantly reduced tumor growth compared to the control group without showing obvious adverse effects. Thus, the PIP combined with ChB can exert a significant inhibitory effect on prostate cancer cell proliferation and castration-resistant tumor growth, suggesting a potential role as a therapeutic agent.
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Du H, Xia H, Liu T, Li Y, Liu J, Xie B, Chen J, Liu T, Cao L, Liu S, Li S, Wang P, Wang D, Zhang Z, Li Y, Guo X, Wu A, Li M, You F. Suppression of ELF4 in ulcerative colitis predisposes host to colorectal cancer. iScience 2021; 24:102169. [PMID: 33665583 PMCID: PMC7907480 DOI: 10.1016/j.isci.2021.102169] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2020] [Revised: 01/12/2021] [Accepted: 02/05/2021] [Indexed: 12/12/2022] Open
Abstract
Ulcerative colitis (UC) is a chronic inflammatory bowel disease, characterized by relapsing and remitting colon mucosal inflammation. For patients suffering from UC, a higher risk of colon cancer has been widely recognized. Here, we found that Elf4−/− mice developed colon tumors with 3 cycles of dextran sulfate sodium salt (DSS) treatment alone. We further showed that ELF4 suppression was prevalent in both patients with UC and DSS-induced mice models, and this suppression was caused by promoter region methylation. ELF4, upon PARylation by PARP1, transcriptionally regulated multiple DNA damage repair machinery components. Consistently, ELF4 deficiency leads to more severe DNA damage both in vitro and in vivo. Oral administration of montmorillonite powder can prevent the reduction of ELF4 in DSS-induced colitis models and lower the risk of colon tumor development during azoxymethane (AOM) and DSS induced colitis-associated cancer (CAC). These data provided additional mechanism of CAC initiation and supported the “epigenetic priming model of tumor initiation”. Elf4 expression is suppressed in both colitis and colitis-associated cancer (CAC). Elf4 deficiency leads to increased hyper-susceptibility to colitis and CAC in mice Elf4 promotes DNA damage repair upon PARylation by PARP1 Oral administration of montmorillonite lowers risk of CAC development
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Affiliation(s)
- Hongqiang Du
- Institute of Systems Biomedicine, Department of Immunology, School of Basic Medical Sciences, Beijing Key Laboratory of Tumor Systems Biology, Peking University Health Science Center, Beijing 100000, China
| | - Huawei Xia
- Institute of Systems Biomedicine, Department of Immunology, School of Basic Medical Sciences, Beijing Key Laboratory of Tumor Systems Biology, Peking University Health Science Center, Beijing 100000, China
| | - Tongtong Liu
- Institute of Systems Biomedicine, Department of Immunology, School of Basic Medical Sciences, Beijing Key Laboratory of Tumor Systems Biology, Peking University Health Science Center, Beijing 100000, China
| | - Yingjie Li
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Department of Gastrointestinal Surgery, Peking University Cancer Hospital and Institute, Beijing 100000, China
| | - Jilong Liu
- Department of surgical oncology, ChuiYangLiu Hospital affiliated to Tsinghua University, Beijing 100000, China
| | - Bingteng Xie
- Center for Reproductive Medicine, Peking University Third Hospital, Beijing 100000, China.,Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing 100000, China
| | - Jingxuan Chen
- Institute of Systems Biomedicine, Department of Immunology, School of Basic Medical Sciences, Beijing Key Laboratory of Tumor Systems Biology, Peking University Health Science Center, Beijing 100000, China
| | - Tong Liu
- College of Animal Science and Veterinary Medicine, Heilongjiang Bayi Agricultural University, Daqing 163000, China
| | - Lili Cao
- Institute of Systems Biomedicine, Department of Immunology, School of Basic Medical Sciences, Beijing Key Laboratory of Tumor Systems Biology, Peking University Health Science Center, Beijing 100000, China
| | - Shengde Liu
- Institute of Systems Biomedicine, Department of Immunology, School of Basic Medical Sciences, Beijing Key Laboratory of Tumor Systems Biology, Peking University Health Science Center, Beijing 100000, China
| | - Siji Li
- Institute of Systems Biomedicine, Department of Immunology, School of Basic Medical Sciences, Beijing Key Laboratory of Tumor Systems Biology, Peking University Health Science Center, Beijing 100000, China
| | - Peiyan Wang
- Institute of Systems Biomedicine, Department of Immunology, School of Basic Medical Sciences, Beijing Key Laboratory of Tumor Systems Biology, Peking University Health Science Center, Beijing 100000, China
| | - Dandan Wang
- Institute of Systems Biomedicine, Department of Immunology, School of Basic Medical Sciences, Beijing Key Laboratory of Tumor Systems Biology, Peking University Health Science Center, Beijing 100000, China
| | - Zeming Zhang
- Institute of Systems Biomedicine, Department of Immunology, School of Basic Medical Sciences, Beijing Key Laboratory of Tumor Systems Biology, Peking University Health Science Center, Beijing 100000, China
| | - Yunfei Li
- Institute of Systems Biomedicine, Department of Immunology, School of Basic Medical Sciences, Beijing Key Laboratory of Tumor Systems Biology, Peking University Health Science Center, Beijing 100000, China
| | - Xiaohuan Guo
- Institute of Immunology, Tsinghua University School of Medicine, Beijing 100000, China
| | - Aiwen Wu
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Department of Gastrointestinal Surgery, Peking University Cancer Hospital and Institute, Beijing 100000, China
| | - Mo Li
- Center for Reproductive Medicine, Peking University Third Hospital, Beijing 100000, China.,Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing 100000, China
| | - Fuping You
- Institute of Systems Biomedicine, Department of Immunology, School of Basic Medical Sciences, Beijing Key Laboratory of Tumor Systems Biology, Peking University Health Science Center, Beijing 100000, China
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Obinata D, Lawrence MG, Takayama K, Choo N, Risbridger GP, Takahashi S, Inoue S. Recent Discoveries in the Androgen Receptor Pathway in Castration-Resistant Prostate Cancer. Front Oncol 2020; 10:581515. [PMID: 33134178 PMCID: PMC7578370 DOI: 10.3389/fonc.2020.581515] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Accepted: 08/27/2020] [Indexed: 12/15/2022] Open
Abstract
The androgen receptor (AR) is the main therapeutic target in advanced prostate cancer, because it regulates the growth and progression of prostate cancer cells. Patients may undergo multiple lines of AR-directed treatments, including androgen-deprivation therapy, AR signaling inhibitors (abiraterone acetate, enzalutamide, apalutamide, or darolutamide), or combinations of these therapies. Yet, tumors inevitably develop resistance to the successive lines of treatment. The diverse mechanisms of resistance include reactivation of the AR and dysregulation of AR cofactors and collaborative transcription factors (TFs). Further elucidating the nexus between the AR and collaborative TFs may reveal new strategies targeting the AR directly or indirectly, such as targeting BET proteins or OCT1. However, appropriate preclinical models will be required to test the efficacy of these approaches. Fortunately, an increasing variety of patient-derived models, such as xenografts and organoids, are being developed for discovery-based research and preclinical drug screening. Here we review the mechanisms of drug resistance in the AR signaling pathway, the intersection with collaborative TFs, and the use of patient-derived models for novel drug discovery.
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Affiliation(s)
- Daisuke Obinata
- Department of Urology, Nihon University School of Medicine, Tokyo, Japan
- Monash Biomedicine Discovery Institute Cancer Program, Prostate Cancer Research Group, Department of Anatomy and Developmental Biology, Monash University, Clayton, VIC, Australia
| | - Mitchell G. Lawrence
- Monash Biomedicine Discovery Institute Cancer Program, Prostate Cancer Research Group, Department of Anatomy and Developmental Biology, Monash University, Clayton, VIC, Australia
- Cancer Research Division, Peter MacCallum Cancer Centre, Melbourne, VIC, Australia
- Sir Peter MacCallum Department of Oncology, The University of Melbourne, Parkville, VIC, Australia
| | - Kenichi Takayama
- Department of Systems Aging Science and Medicine, Tokyo Metropolitan Institute of Gerontology, Tokyo, Japan
| | - Nicholas Choo
- Monash Biomedicine Discovery Institute Cancer Program, Prostate Cancer Research Group, Department of Anatomy and Developmental Biology, Monash University, Clayton, VIC, Australia
| | - Gail P. Risbridger
- Monash Biomedicine Discovery Institute Cancer Program, Prostate Cancer Research Group, Department of Anatomy and Developmental Biology, Monash University, Clayton, VIC, Australia
- Cancer Research Division, Peter MacCallum Cancer Centre, Melbourne, VIC, Australia
- Sir Peter MacCallum Department of Oncology, The University of Melbourne, Parkville, VIC, Australia
| | - Satoru Takahashi
- Department of Urology, Nihon University School of Medicine, Tokyo, Japan
| | - Satoshi Inoue
- Department of Systems Aging Science and Medicine, Tokyo Metropolitan Institute of Gerontology, Tokyo, Japan
- Research Center for Genomic Medicine, Saitama Medical University, Saitama, Japan
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6
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Moonlighting in Mitosis: Analysis of the Mitotic Functions of Transcription and Splicing Factors. Cells 2020; 9:cells9061554. [PMID: 32604778 PMCID: PMC7348712 DOI: 10.3390/cells9061554] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2020] [Revised: 06/22/2020] [Accepted: 06/23/2020] [Indexed: 12/14/2022] Open
Abstract
Moonlighting proteins can perform one or more additional functions besides their primary role. It has been posited that a protein can acquire a moonlighting function through a gradual evolutionary process, which is favored when the primary and secondary functions are exerted in different cellular compartments. Transcription factors (TFs) and splicing factors (SFs) control processes that occur in interphase nuclei and are strongly reduced during cell division, and are therefore in a favorable situation to evolve moonlighting mitotic functions. However, recently published moonlighting protein databases, which comprise almost 400 proteins, do not include TFs and SFs with secondary mitotic functions. We searched the literature and found several TFs and SFs with bona fide moonlighting mitotic functions, namely they localize to specific mitotic structure(s), interact with proteins enriched in the same structure(s), and are required for proper morphology and functioning of the structure(s). In addition, we describe TFs and SFs that localize to mitotic structures but cannot be classified as moonlighting proteins due to insufficient data on their biochemical interactions and mitotic roles. Nevertheless, we hypothesize that most TFs and SFs with specific mitotic localizations have either minor or redundant moonlighting functions, or are evolving towards the acquisition of these functions.
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Páhi ZG, Borsos BN, Pantazi V, Ujfaludi Z, Pankotai T. PARylation During Transcription: Insights into the Fine-Tuning Mechanism and Regulation. Cancers (Basel) 2020; 12:cancers12010183. [PMID: 31940791 PMCID: PMC7017041 DOI: 10.3390/cancers12010183] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Revised: 12/19/2019] [Accepted: 01/09/2020] [Indexed: 01/31/2023] Open
Abstract
Transcription is a multistep, tightly regulated process. During transcription initiation, promoter recognition and pre-initiation complex (PIC) formation take place, in which dynamic recruitment or exchange of transcription activators occur. The precise coordination of the recruitment and removal of transcription factors, as well as chromatin structural changes, are mediated by post-translational modifications (PTMs). Poly(ADP-ribose) polymerases (PARPs) are key players in this process, since they can modulate DNA-binding activities of specific transcription factors through poly-ADP-ribosylation (PARylation). PARylation can regulate the transcription at three different levels: (1) by directly affecting the recruitment of specific transcription factors, (2) by triggering chromatin structural changes during initiation and as a response to cellular stresses, or (3) by post-transcriptionally modulating the stability and degradation of specific mRNAs. In this review, we principally focus on these steps and summarise the recent findings, demonstrating the mechanisms through which PARylation plays a potential regulatory role during transcription and DNA repair.
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Banerjee J, Lodhi N, Nguyen BN. The Role of Poly(ADP-Ribose) Polymerase-1 in Cutaneous Wound Healing. Adv Wound Care (New Rochelle) 2019; 8:634-643. [PMID: 31750014 DOI: 10.1089/wound.2018.0821] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2018] [Accepted: 03/13/2019] [Indexed: 12/15/2022] Open
Abstract
Critical Issue: Chronic nonhealing wounds of the lower extremities resulting in major amputations are a major health problem worldwide. Significance: Diabetes and ischemia are two major etiologies of nonhealing wounds of the lower extremities. Hyperglycemia from diabetes and oxidative stress from ischemia activate polyadenosine diphosphate (ADP)-ribose polymerase-1 (PARP-1), which is a nuclear enzyme that is best known for its role in DNA repair. However, the exact function of PARP-1 in ischemic/diabetic wound healing has not been well studied. Recent Advances: Poly-ADP-ribose (PAR) polymer has been detected in the wound bed and many of the PARylation-related reactions (oxidative stress response, expression of inflammatory cytokines and chemokines, cell proliferation, and migration) are important in the wound healing process. However, the role of PARP-1 in wound healing and the potential of targeting PARP-1 therapeutically in wounds are only recently being elucidated, with much still unknown. This review summarizes the recent advances in this field, highlighting some of the mechanisms through which PARP-1 may affect normal wound closure. Future Directions: The review also presents a perspective on some of the downstream targets of PARP-1 that may be explored for their role in wound healing and discusses about the therapeutic potential of PARP inhibitors for wound healing.
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Affiliation(s)
- Jaideep Banerjee
- Department of Vascular Surgery, George Washington University, Washington, District of Columbia
| | - Niraj Lodhi
- Department of Biomedical Research, Hackensack University Medical Center, Hackensack, New Jersey
| | - Bao-Ngoc Nguyen
- Department of Vascular Surgery, George Washington University, Washington, District of Columbia
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Poly(ADP-Ribose) Polymerases in Host-Pathogen Interactions, Inflammation, and Immunity. Microbiol Mol Biol Rev 2018; 83:83/1/e00038-18. [PMID: 30567936 DOI: 10.1128/mmbr.00038-18] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
The literature review presented here details recent research involving members of the poly(ADP-ribose) polymerase (PARP) family of proteins. Among the 17 recognized members of the family, the human enzyme PARP1 is the most extensively studied, resulting in a number of known biological and metabolic roles. This review is focused on the roles played by PARP enzymes in host-pathogen interactions and in diseases with an associated inflammatory response. In mammalian cells, several PARPs have specific roles in the antiviral response; this is perhaps best illustrated by PARP13, also termed the zinc finger antiviral protein (ZAP). Plant stress responses and immunity are also regulated by poly(ADP-ribosyl)ation. PARPs promote inflammatory responses by stimulating proinflammatory signal transduction pathways that lead to the expression of cytokines and cell adhesion molecules. Hence, PARP inhibitors show promise in the treatment of inflammatory disorders and conditions with an inflammatory component, such as diabetes, arthritis, and stroke. These functions are correlated with the biophysical characteristics of PARP family enzymes. This work is important in providing a comprehensive understanding of the molecular basis of pathogenesis and host responses, as well as in the identification of inhibitors. This is important because the identification of inhibitors has been shown to be effective in arresting the progression of disease.
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Cseh AM, Fábián Z, Sümegi B, Scorrano L. Poly(adenosine diphosphate-ribose) polymerase as therapeutic target: lessons learned from its inhibitors. Oncotarget 2018; 8:50221-50239. [PMID: 28430591 PMCID: PMC5564845 DOI: 10.18632/oncotarget.16859] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2017] [Accepted: 03/28/2017] [Indexed: 01/27/2023] Open
Abstract
Poly(ADP-ribose) polymerases are a family of DNA-dependent nuclear enzymes catalyzing the transfer of ADP-ribose moieties from cellular nicotinamide-adenine-dinucleotide to a variety of target proteins. Although they have been considered as resident nuclear elements of the DNA repair machinery, recent works revealed a more intricate physiologic role of poly(ADP-ribose) polymerases with numerous extranuclear activities. Indeed, poly(ADP-ribose) polymerases participate in fundamental cellular processes like chromatin remodelling, transcription or regulation of the cell-cycle. These new insight into the physiologic roles of poly(ADP-ribose) polymerases widens the range of human pathologies in which pharmacologic inhibition of these enzymes might have a therapeutic potential. Here, we overview our current knowledge on extranuclear functions of poly(ADP-ribose) polymerases with a particular focus on the mitochondrial ones and discuss potential fields of future clinical applications.
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Affiliation(s)
- Anna Mária Cseh
- Department of Biochemistry and Medical Chemistry, University of Pécs Medical School, Pécs, Hungary.,Department of Biology, University of Padova, Padova, Italy
| | - Zsolt Fábián
- Conway Institute, University College Dublin, Belfield, Dublin, Ireland
| | - Balázs Sümegi
- Department of Biochemistry and Medical Chemistry, University of Pécs Medical School, Pécs, Hungary
| | - Luca Scorrano
- Department of Biology, University of Padova, Padova, Italy
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Obinata D, Takayama K, Takahashi S, Inoue S. Crosstalk of the Androgen Receptor with Transcriptional Collaborators: Potential Therapeutic Targets for Castration-Resistant Prostate Cancer. Cancers (Basel) 2017; 9:E22. [PMID: 28264478 PMCID: PMC5366817 DOI: 10.3390/cancers9030022] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Revised: 02/21/2017] [Accepted: 02/21/2017] [Indexed: 02/06/2023] Open
Abstract
Prostate cancer is the second leading cause of death from cancer among males in Western countries. It is also the most commonly diagnosed male cancer in Japan. The progression of prostate cancer is mainly influenced by androgens and the androgen receptor (AR). Androgen deprivation therapy is an established therapy for advanced prostate cancer; however, prostate cancers frequently develop resistance to low testosterone levels and progress to the fatal stage called castration-resistant prostate cancer (CRPC). Surprisingly, AR and the AR signaling pathway are still activated in most CRPC cases. To overcome this problem, abiraterone acetate and enzalutamide were introduced for the treatment of CRPC. Despite the impact of these drugs on prolonged survival, CRPC acquires further resistance to keep the AR pathway activated. Functional molecular studies have shown that some of the AR collaborative transcription factors (TFs), including octamer transcription factor (OCT1), GATA binding protein 2 (GATA2) and forkhead box A1 (FOXA1), still stimulate AR activity in the castration-resistant state. Therefore, elucidating the crosstalk between the AR and collaborative TFs on the AR pathway is critical for developing new strategies for the treatment of CRPC. Recently, many compounds targeting this pathway have been developed for treating CRPC. In this review, we summarize the AR signaling pathway in terms of AR collaborators and focus on pyrrole-imidazole (PI) polyamide as a candidate compound for the treatment of prostate cancer.
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Affiliation(s)
- Daisuke Obinata
- Department of Urology, Nihon University School of Medicine, Tokyo 173-8610, Japan.
- Department of Functional Biogerontology, Tokyo Metropolitan Institute of Gerontology, Tokyo 173-0015, Japan.
| | - Kenichi Takayama
- Department of Functional Biogerontology, Tokyo Metropolitan Institute of Gerontology, Tokyo 173-0015, Japan.
| | - Satoru Takahashi
- Department of Urology, Nihon University School of Medicine, Tokyo 173-8610, Japan.
| | - Satoshi Inoue
- Department of Functional Biogerontology, Tokyo Metropolitan Institute of Gerontology, Tokyo 173-0015, Japan.
- Division of Gene Regulation and Signal Transduction, Research Center for Genomic Medicine, Saitama Medical University, Saitama 350-1241, Japan.
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Gross S, Kotova EY, Maluchenko NV, Pascal JM, Studitsky VM. Evaluating Parp1 domains as gossypol targets. ACTA ACUST UNITED AC 2016. [DOI: 10.3103/s0096392516040106] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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13
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Maluchenko NV, Kulaeva OI, Kotova EY, Chupyrkina AA, Nikitin DV, Kirpichnikov MP, Studitsky VM. Molecular mechanisms of transcriptional regulation by Poly(ADP-ribose) polymerase 1. Mol Biol 2015. [DOI: 10.1134/s0026893315010094] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Swindall AF, Stanley JA, Yang ES. PARP-1: Friend or Foe of DNA Damage and Repair in Tumorigenesis? Cancers (Basel) 2013; 5:943-58. [PMID: 24202328 PMCID: PMC3795373 DOI: 10.3390/cancers5030943] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2013] [Revised: 07/17/2013] [Accepted: 07/19/2013] [Indexed: 12/12/2022] Open
Abstract
Oxidative stress induced by reactive oxygen species can result in DNA damage within cells and subsequently increase risk for carcinogenesis. This may be averted by repair of DNA damage through the base or nucleotide excision repair (BER/NER) pathways. PARP, a BER protein, is known for its role in DNA-repair. However, multiple lesions can occur within a small range of DNA, known as oxidative clustered DNA lesions (OCDLs), which are difficult to repair and may lead to the more severe DNA double-strand break (DSB). Inefficient DSB repair can then result in increased mutagenesis and neoplastic transformation. OCDLs occur more frequently within a variety of tumor tissues. Interestingly, PARP is highly expressed in several human cancers. Additionally, chronic inflammation may contribute to tumorigenesis through ROS-induced DNA damage. Furthermore, PARP can modulate inflammation through interaction with NFκB and regulating the expression of inflammatory signaling molecules. Thus, the upregulation of PARP may present a double-edged sword. PARP is needed to repair ROS-induced DNA lesions, but PARP expression may lead to increased inflammation via upregulation of NFκB signaling. Here, we discuss the role of PARP in the repair of oxidative damage versus the formation of OCDLs and speculate on the feasibility of PARP inhibition for the treatment and prevention of cancers by exploiting its role in inflammation.
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Affiliation(s)
- Amanda F. Swindall
- Department of Radiation Oncology Comprehensive Cancer Center, University of Alabama at Birmingham School of Medicine, 176F HSROC Suite 2232B, 1700 6th Avenue South, Birmingham, AL 35249, USA; E-Mails: (A.F.S.); (J.A.S.)
| | - Jennifer A. Stanley
- Department of Radiation Oncology Comprehensive Cancer Center, University of Alabama at Birmingham School of Medicine, 176F HSROC Suite 2232B, 1700 6th Avenue South, Birmingham, AL 35249, USA; E-Mails: (A.F.S.); (J.A.S.)
| | - Eddy S. Yang
- Department of Radiation Oncology Comprehensive Cancer Center, University of Alabama at Birmingham School of Medicine, 176F HSROC Suite 2232B, 1700 6th Avenue South, Birmingham, AL 35249, USA; E-Mails: (A.F.S.); (J.A.S.)
- Department of Cell, Developmental and Integrative Biology, University of Alabama at Birmingham, Birmingham, AL 35249, USA
- Department of Pharmacology and Toxicology, University of Alabama at Birmingham, Birmingham, AL 35249, USA
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +1-205-934-2762; Fax: +1-205-975-0784
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Guo G, Rödelsperger C, Digweed M, Robinson PN. Regulation of fibrillin-1 gene expression by Sp1. Gene 2013; 527:448-55. [PMID: 23860323 DOI: 10.1016/j.gene.2013.07.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2013] [Revised: 07/01/2013] [Accepted: 07/05/2013] [Indexed: 11/28/2022]
Abstract
Mutations in the fibrillin-1 gene (FBN1) cause Marfan Syndrome (MFS), a hereditary disorder of connective tissue. The transcription of FBN1 has been reported to be driven by a short ultraconserved region (SUPR) in the 5' untranslated exon A of FBN1, but the nature of other factors involved in FBN1 gene regulation has not been clarified. In this study, we characterized the transcription factors involved in FBN1 gene regulation. The results show that Sp1 protein binds to two putative binding sites in the promoter of FBN1. Overexpression of Sp1 resulted in a significant increase in both promoter activity and FBN1 mRNA level in HEK 293 cells, whereas inhibition or knockdown of Sp1 decreased FBN1 gene expression. In addition, we found that Poly [ADP-ribose] polymerase 1 (PARP1) binds to the palindromic sequence TCTCGCGAGA in the ultraconserved region of the FBN1 promoter and that the regulation of FBN1 expression by PARP1 is dependent on Sp1. These results indicate that both Sp1 and PARP1 contribute to FBN1 gene expression. These observations add to our understanding of the transcriptional regulation of FBN1 gene expression.
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Affiliation(s)
- Gao Guo
- Institute for Medical Genetics and Human Genetics, Charité-Universitätsmedizin Berlin, Augustenburger Platz 1, 13353 Berlin, Germany
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16
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Kang J, Shen Z, Lim JM, Handa H, Wells L, Tantin D. Regulation of Oct1/Pou2f1 transcription activity by O-GlcNAcylation. FASEB J 2013; 27:2807-17. [PMID: 23580612 DOI: 10.1096/fj.12-220897] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The Oct1 transcription factor is a potent regulator of stress responses, metabolism, and tumorigenicity. Although Oct1 is regulated by phosphorylation and ubiquitination, the presence and importance of other modifications is unknown. Here we show that Oct1 is modified by O-linked β-N-acetylglucosamine (O-GlcNAc) moieties. We map two sites of O-GlcNAcylation at positions T255 and S728 within human Oct1. Under anchorage-independent overgrowth conditions, Oct1 associates 3-fold more strongly with the Gadd45a promoter and mediates transcriptional repression. Increased binding correlates with quantitative reductions in Oct1 nuclear periphery-associated puncta, and a reduced association with lamin B1. The O-GlcNAc modification sites are important for both Gadd45a repression and anchorage-independent survival. In contrast to chronic overgrowth conditions, following acute nutrient starvation Oct1 mediates Gadd45a activation. The O-GlcNAc sites are also important for Gadd45a activation under these conditions. We also, for the first time, identify specific Oct1 ubiquitination sites. The findings suggest that Oct1 integrates metabolic and stress signals via O-GlcNAc modification to regulate target gene activity.
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Affiliation(s)
- Jinsuk Kang
- Department of Pathology, University of Utah School of Medicine, Salt Lake City, UT 84112, USA
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17
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Mizuguchi H, Miyagi K, Terao T, Sakamoto N, Yamawaki Y, Adachi T, Ono S, Sasaki Y, Yoshimura Y, Kitamura Y, Takeda N, Fukui H. PMA-induced dissociation of Ku86 from the promoter causes transcriptional up-regulation of histamine H(1) receptor. Sci Rep 2012; 2:916. [PMID: 23209876 PMCID: PMC3512088 DOI: 10.1038/srep00916] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2012] [Accepted: 10/24/2012] [Indexed: 12/05/2022] Open
Abstract
Histamine H1 receptor (H1R) gene is up-regulated in patients with allergic rhinitis, and its expression level strongly correlates with the severity of symptoms. However, the mechanism underlying this remains unknown. Here we report the mechanism of H1R gene up-regulation. The luciferase assay revealed the existence of two promoter regions, A and B1. Two AP-1 and one Ets-1 bound to region A, while Ku86, Ku70, and PARP-1 bound to region B1. Ku86 was responsible for DNA binding and poly(ADP-ribosyl)ated in response to phorbol-12-myristate-13-acetate stimulation, inducing its dissociation from region B1 that is crucial for promoter activity. Knockdown of Ku86 gene enhanced up-regulation of H1R gene expression. Experiments using inhibitors for MEK and PARP-1 indicate that regions A and B1 are downstream regulatory elements of the PKCδ/ERK/PARP-1 signaling pathway. Data suggest a novel mechanism for the up-regulation of H1R gene expression.
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Affiliation(s)
- Hiroyuki Mizuguchi
- Department of Molecular Pharmacology, Institute of Health Biosciences, The University of Tokushima Graduate School, Tokushima 770-8505, Japan
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18
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Ko HL, Ren EC. Functional Aspects of PARP1 in DNA Repair and Transcription. Biomolecules 2012; 2:524-48. [PMID: 24970148 PMCID: PMC4030864 DOI: 10.3390/biom2040524] [Citation(s) in RCA: 126] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2012] [Revised: 10/24/2012] [Accepted: 10/31/2012] [Indexed: 01/08/2023] Open
Abstract
Poly (ADP-ribose) polymerase 1 (PARP1) is an ADP-ribosylating enzyme essential for initiating various forms of DNA repair. Inhibiting its enzyme activity with small molecules thus achieves synthetic lethality by preventing unwanted DNA repair in the treatment of cancers. Through enzyme-dependent chromatin remodeling and enzyme-independent motif recognition, PARP1 also plays important roles in regulating gene expression. Besides presenting current findings on how each process is individually controlled by PARP1, we shall discuss how transcription and DNA repair are so intricately linked that disturbance by PARP1 enzymatic inhibition, enzyme hyperactivation in diseases, and viral replication can favor one function while suppressing the other.
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Affiliation(s)
- Hui Ling Ko
- Singapore Immunology Network, A*STAR, 8A Biomedical Grove, #03-06 Immunos, Singapore 138648, Singapore.
| | - Ee Chee Ren
- Singapore Immunology Network, A*STAR, 8A Biomedical Grove, #03-06 Immunos, Singapore 138648, Singapore.
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19
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Kang J, Goodman B, Zheng Y, Tantin D. Dynamic regulation of Oct1 during mitosis by phosphorylation and ubiquitination. PLoS One 2011; 6:e23872. [PMID: 21897860 PMCID: PMC3163677 DOI: 10.1371/journal.pone.0023872] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2011] [Accepted: 07/27/2011] [Indexed: 01/03/2023] Open
Abstract
Background Transcription factor Oct1 regulates multiple cellular processes. It is known to be phosphorylated during the cell cycle and by stress, however the upstream kinases and downstream consequences are not well understood. One of these modified forms, phosphorylated at S335, lacks the ability to bind DNA. Other modification states besides phosphorylation have not been described. Methodology/Principal Findings We show that Oct1 is phosphorylated at S335 in the Oct1 DNA binding domain during M-phase by the NIMA-related kinase Nek6. Phospho-Oct1 is also ubiquitinated. Phosphorylation excludes Oct1 from mitotic chromatin. Instead, Oct1pS335 concentrates at centrosomes, mitotic spindle poles, kinetochores and the midbody. Oct1 siRNA knockdown diminishes the signal at these locations. Both Oct1 ablation and overexpression result in abnormal mitoses. S335 is important for the overexpression phenotype, implicating this residue in mitotic regulation. Oct1 depletion causes defects in spindle morphogenesis in Xenopus egg extracts, establishing a mitosis-specific function of Oct1. Oct1 colocalizes with lamin B1 at the spindle poles and midbody. At the midbody, both proteins are mutually required to correctly localize the other. We show that phospho-Oct1 is modified late in mitosis by non-canonical K11-linked polyubiquitin chains. Ubiquitination requires the anaphase-promoting complex, and we further show that the anaphase-promoting complex large subunit APC1 and Oct1pS335 interact. Conclusions/Significance These findings reveal mechanistic coupling between Oct1 phosphorylation and ubquitination during mitotic progression, and a role for Oct1 in mitosis.
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Affiliation(s)
- Jinsuk Kang
- Department of Pathology, University of Utah School of Medicine, Salt Lake City, Utah, United States of America
| | - Ben Goodman
- Department of Embryology, Carnegie Institution of Washington/HHMI, Baltimore, Maryland, United States of America
| | - Yixian Zheng
- Department of Embryology, Carnegie Institution of Washington/HHMI, Baltimore, Maryland, United States of America
| | - Dean Tantin
- Department of Pathology, University of Utah School of Medicine, Salt Lake City, Utah, United States of America
- * E-mail:
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20
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Range R, Lepage T. Maternal Oct1/2 is required for Nodal and Vg1/Univin expression during dorsal-ventral axis specification in the sea urchin embryo. Dev Biol 2011; 357:440-9. [PMID: 21782809 DOI: 10.1016/j.ydbio.2011.07.005] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2011] [Revised: 07/01/2011] [Accepted: 07/05/2011] [Indexed: 01/19/2023]
Abstract
The TGFβ family member Nodal is expressed early in the presumptive ventral ectoderm of the early sea urchin embryo and its activity is crucial for dorsal-ventral (D/V) axis specification. Analysis of the nodal promoter identified a number of critical binding sites for transcription factors of different families including Sox, Oct, TCF and bZIP, but in most cases the specific factors that regulate nodal expression are not known. In this study, we report that the maternal factor Oct1/2 functions as a positive regulator of nodal and that its activity is essential for the initiation of nodal expression. Inhibition of Oct1/2 mRNA translation produced embryos with severe axial defects similar to those observed following inhibition of Nodal function. We show that perturbing Oct1/2 function specifically disrupted specification of the ventral and dorsal ectodermal regions and that these effects were caused by the failure of nodal to be expressed early in development. Furthermore, we identified the key gene vg1/univin, which is also necessary for nodal expression, as an additional factor that was completely dependent on Oct1/2 for its zygotic expression. These data demonstrate that the maternal Oct1/2 protein plays an early and essential role in D/V axis specification by initiating the expression of nodal and vg1/univin, two genes that act at the top of the D/V ectoderm gene regulatory network.
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Affiliation(s)
- Ryan Range
- Université Pierre et Marie Curie (Paris 6), UMR 7009 CNRS, Observatoire Océanologique, 06230 Villefranche-sur-mer, France
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21
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Mizuguchi H, Terao T, Kitai M, Ikeda M, Yoshimura Y, Das AK, Kitamura Y, Takeda N, Fukui H. Involvement of protein kinase Cdelta/extracellular signal-regulated kinase/poly(ADP-ribose) polymerase-1 (PARP-1) signaling pathway in histamine-induced up-regulation of histamine H1 receptor gene expression in HeLa cells. J Biol Chem 2011; 286:30542-30551. [PMID: 21730054 DOI: 10.1074/jbc.m111.253104] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The histamine H(1) receptor (H1R) gene is up-regulated in patients with allergic rhinitis. However, the mechanism and reason underlying this up-regulation are still unknown. Recently, we reported that the H1R expression level is strongly correlated with the severity of allergic symptoms. Therefore, understanding the mechanism of this up-regulation will help to develop new anti-allergic drugs targeted for H1R gene expression. Here we studied the molecular mechanism of H1R up-regulation in HeLa cells that express H1R endogenously in response to histamine and phorbol 12-myristate 13-acetate (PMA). In HeLa cells, histamine stimulation caused up-regulation of H1R gene expression. Rottlerin, a PKCδ-selective inhibitor, inhibited up-regulation of H1R gene expression, but Go6976, an inhibitor of Ca(2+)-dependent PKCs, did not. Histamine or PMA stimulation resulted in PKCδ phosphorylation at Tyr(311) and Thr(505). Activation of PKCδ by H(2)O(2) resulted in H1R mRNA up-regulation. Overexpression of PKCδ enhanced up-regulation of H1R gene expression, and knockdown of the PKCδ gene suppressed this up-regulation. Histamine or PMA caused translocation PKCδ from the cytosol to the Golgi. U0126, an MEK inhibitor, and DPQ, a poly(ADP-ribose) polymerase-1 inhibitor, suppressed PMA-induced up-regulation of H1R gene expression. These results were confirmed by a luciferase assay using the H1R promoter. Phosphorylation of ERK and Raf-1 in response to PMA was also observed. However, real-time PCR analysis showed no inhibition of H1R mRNA up-regulation by a Raf-1 inhibitor. These results suggest the involvement of the PKCδ/ERK/poly(ADP-ribose) polymerase-1 signaling pathway in histamine- or PMA-induced up-regulation of H1R gene expression in HeLa cells.
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Affiliation(s)
| | - Takuma Terao
- Departments of Molecular Pharmacology, Tokushima 770-8505, Japan
| | - Mika Kitai
- Departments of Molecular Pharmacology, Tokushima 770-8505, Japan
| | - Mitsuhiro Ikeda
- Departments of Molecular Pharmacology, Tokushima 770-8505, Japan
| | | | - Asish Kumar Das
- Departments of Molecular Pharmacology, Tokushima 770-8505, Japan
| | - Yoshiaki Kitamura
- Otolaryngology, Institute of Health Biosciences, The University of Tokushima Graduate School, Tokushima 770-8505, Japan
| | - Noriaki Takeda
- Otolaryngology, Institute of Health Biosciences, The University of Tokushima Graduate School, Tokushima 770-8505, Japan
| | - Hiroyuki Fukui
- Departments of Molecular Pharmacology, Tokushima 770-8505, Japan.
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22
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Aneja RK, Sjodin H, Gefter JV, Zingarelli B, Delude RL. Small interfering RNA mediated Poly (ADP-ribose) Polymerase-1 inhibition upregulates the heat shock response in a murine fibroblast cell line. JOURNAL OF INFLAMMATION-LONDON 2011; 8:3. [PMID: 21345219 PMCID: PMC3051880 DOI: 10.1186/1476-9255-8-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/20/2010] [Accepted: 02/23/2011] [Indexed: 11/10/2022]
Abstract
Poly (ADP-ribose) polymerase-1 (PARP-1) is a highly conserved multifunctional enzyme, and its catalytic activity is stimulated by DNA breaks. The activation of PARP-1 and subsequent depletion of nicotinamide adenine dinucleotide (NAD+) and adenosine triphosphate (ATP) contributes to significant cytotoxicity in inflammation of various etiologies. On the contrary, induction of heat shock response and production of heat shock protein 70 (HSP-70) is a cytoprotective defense mechanism in inflammation. Recent data suggests that PARP-1 modulates the expression of a number of cellular proteins at the transcriptional level. In this study, small interfering RNA (siRNA) mediated PARP-1 knockdown in murine wild-type fibroblasts augmented heat shock response as compared to untreated cells (as evaluated by quantitative analysis of HSP-70 mRNA and HSP-70 protein expression). These events were associated with increased DNA binding of the heat shock factor-1 (HSF-1), the major transcription factor of the heat shock response. Co-immunoprecipitation experiments in nuclear extracts of the wild type cells demonstrated that PARP-1directly interacted with HSF-1. These data demonstrate that, in wild type fibroblasts, PARP-1 plays a pivotal role in modulating the heat shock response both through direct interaction with HSF-1 and poly (ADP-ribosylation).
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Affiliation(s)
- Rajesh K Aneja
- Departments of Critical Care Medicine and Pediatrics, University of Pittsburgh School of Medicine and Children's Hospital of Pittsburgh, Pittsburgh, PA 15213, USA.
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23
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Fauzee NJS, Pan J, Wang YL. PARP and PARG inhibitors--new therapeutic targets in cancer treatment. Pathol Oncol Res 2010; 16:469-78. [PMID: 20383759 DOI: 10.1007/s12253-010-9266-6] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/23/2009] [Accepted: 03/29/2010] [Indexed: 02/06/2023]
Abstract
Today, the number of cancer patients throughout the world is increasing alarmingly and as per the World Health Organisation (WHO) data and statistics the prediction for the year 2020 will be 15 million new cases as compared to only 10 million cases in year 2000 leaving us dumbfounded. A lot of effort has been put in by researchers and scientists over decades to find drugs helpful in the treatment of cancers for the benefit of patients--the latest being the Poly ADP-ribose polymerase (PARP) and the Poly ADP-ribose glycohydrolase (PARG) inhibitors. This review highlights their mechanism of action under the rationale of their use and current development in the field of cancer.
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Affiliation(s)
- Nilufer Jasmine Selimah Fauzee
- Department of Pathology, Molecular Medicine and Cancer Research Center, Chongqing Medical University, Chongqing 400016, China
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24
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Vidaković M, Dinić S, Grdović N, Mihailović M, Uskoković A, Quesada P, Poznanović G. Regulation of rat haptoglobin gene expression is coordinated by the nuclear matrix. J Cell Biochem 2009; 107:1205-21. [PMID: 19521970 DOI: 10.1002/jcb.22225] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Using computer stress-induced duplex destabilization (SIDD) analysis and binding experiments, we identified a S/MAR element (-599/-200 bp) (Hp-S/MAR) adjacent to the cis-element (-165/-56 bp) in the rat haptoglobin gene. We examined its functional interactions with the lamins and lamin-associated proteins in the basal state and during acute-phase (AP) response-induced increased transcription. Colocalization, electrophoretic mobility shift assay (EMSA), and re-electrophoresis of nucleoprotein complexes, South-Western and Western blot analysis and coimmunoprecipitation experiments revealed that the lamins, PARP-1, C/EBP beta, and Hp-S/MAR assembled higher order complexes through direct lamin-Hp-S/MAR and probably PARP-1-Hp-S/MAR interactions although C/EBP beta did not bind to the Hp-S/MAR but established direct interaction with PARP-1. The transition from constitutive to increased haptoglobin gene transcription during the AP response was associated with quantitative and qualitative changes in Hp-S/MAR-protein interactions, respectively, observed as increased association of the lamin(s) with the Hp-S/MAR and as the appearance of a 90 kDa Hp-S/MAR-binding protein. Also, during the AP response the contact between C/EBP beta and PARP-1 established in the basal state was lost. DNA chromatography with the haptoglobin cis-element and Western blot analysis suggests that PARP-1 was a coactivator during constitutive and elevated transcription. The results show that the lamin components of the nuclear matrix form a network of functional, dynamic protein-protein and protein-Hp-S/MAR associations with multiple partners, and underline the involvement of PARP-1 in the regulation of haptoglobin gene transcription. We concluded that the interplay of these interactions fine tunes haptoglobin gene expression to meet the changing requirements of liver cells.
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Affiliation(s)
- Melita Vidaković
- Department of Molecular Biology, Institute for Biological Research, University of Belgrade, Bulevar Despota Stefana 142, 11060 Belgrade, Serbia.
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25
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Kang J, Shakya A, Tantin D. Stem cells, stress, metabolism and cancer: a drama in two Octs. Trends Biochem Sci 2009; 34:491-9. [PMID: 19733480 DOI: 10.1016/j.tibs.2009.06.003] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2009] [Revised: 05/30/2009] [Accepted: 06/03/2009] [Indexed: 01/16/2023]
Abstract
It is a classic story of two related transcription factors. Oct4 is a potent regulator of pluripotency during early mammalian embryonic development, and is notable for its ability to convert adult somatic cells to pluripotency. The widely expressed Oct1 protein shares significant homology with Oct4, binds to the same sequences, regulates common target genes, and shares common modes of upstream regulation, including the ability to respond to cellular stress. Both proteins are also associated with malignancy, yet Oct1 cannot substitute for Oct4 in the generation of pluripotency. The molecular underpinnings of these phenomena are emerging, as are the consequences for adult stem cells and cancer, and thereby hangs a tale.
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Affiliation(s)
- Jinsuk Kang
- Department of Pathology, University of Utah School of Medicine, Salt Lake City, Utah 84112, USA
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26
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Vidaković M, Gluch A, Qiao J, Oumard A, Frisch M, Poznanović G, Bode J. PARP-1 expression in the mouse is controlled by an autoregulatory loop: PARP-1 binding to an upstream S/MAR element and to a novel recognition motif in its promoter suppresses transcription. J Mol Biol 2009; 388:730-50. [PMID: 19303024 DOI: 10.1016/j.jmb.2009.03.032] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2008] [Revised: 02/26/2009] [Accepted: 03/09/2009] [Indexed: 11/16/2022]
Abstract
This work identifies central components of a feedback mechanism for the expression of mouse poly(ADP-ribose) polymerase-1 (PARP-1). Using the stress-induced duplex destabilization algorithm, multiple base-unpairing regions (BURs) could be localized in the 5' region of the mouse PARP-1 gene (muPARP-1). Some of these could be identified as scaffold/matrix-attachment regions (S/MARs), suggesting an S/MAR-mediated transcriptional regulation. PARP-1 binding to the most proximal element, S/MAR 1, and to three consensus motifs, AGGCC, in its own promoter (basepairs -956 to +100), could be traced by electrophoretic mobility-shift assay. The AGGCC-complementary GGCCT motif was detected by cis-diammine-dichloro platinum cross-linking and functionally characterized by the effects of site-directed mutagenesis on its performance in wild type (PARP-1(+/+)) and PARP-1 knockout cells (PARP-1(-/-)). Mutation of the central AGGCC tract at basepairs -554 to -550 prevented PARP-1/promoter interactions, whereby muPARP-1 expression became up-regulated. Transfection of a series of reporter gene constructs with or without S/MAR 1 (basepairs -1523 to -1007) and the more distant S/MAR 2 (basepairs -8373 to -6880), into PARP-1(+/+) as well as PARP-1(-/-) cells, revealed an additional, major level of muPARP-1 promoter down-regulation, triggered by PARP-1 binding to S/MAR 1. We conclude that S/MAR 1 represents an upstream control element that acts in conjunction with the muPARP-1 promoter. These interactions are part of a negative autoregulatory loop.
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Affiliation(s)
- Melita Vidaković
- Helmholtz Centre for Infection Research, Epigenetic Regulation, Braunschweig, Germany
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27
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Kang J, Gemberling M, Nakamura M, Whitby FG, Handa H, Fairbrother WG, Tantin D. A general mechanism for transcription regulation by Oct1 and Oct4 in response to genotoxic and oxidative stress. Genes Dev 2009; 23:208-22. [PMID: 19171782 DOI: 10.1101/gad.1750709] [Citation(s) in RCA: 95] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Oct1 and Oct4 are homologous transcription factors with similar DNA-binding specificities. Here we show that Oct1 is dynamically phosphorylated in vivo following exposure of cells to oxidative and genotoxic stress. We further show that stress regulates the selectivity of both proteins for specific DNA sequences. Mutation of conserved phosphorylation target DNA-binding domain residues in Oct1, and Oct4 confirms their role in regulating binding selectivity. Using chromatin immunoprecipitation, we show that association of Oct4 and Oct1 with a distinct group of in vivo targets is inducible by stress, and that Oct1 is essential for a normal post-stress transcriptional response. Finally, using an unbiased Oct1 target screen we identify a large number of genes targeted by Oct1 specifically under conditions of stress, and show that several of these inducible Oct1 targets are also inducibly bound by Oct4 in embryonic stem cells following stress exposure.
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Affiliation(s)
- Jinsuk Kang
- Department of Pathology, University of Utah School of Medicine, Salt Lake City, Utah 84112, USA
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28
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Rancourt A, Satoh MS. Delocalization of nucleolar poly(ADP-ribose) polymerase-1 to the nucleoplasm and its novel link to cellular sensitivity to DNA damage. DNA Repair (Amst) 2009; 8:286-97. [PMID: 19144573 DOI: 10.1016/j.dnarep.2008.11.018] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2008] [Revised: 09/30/2008] [Accepted: 11/04/2008] [Indexed: 11/28/2022]
Abstract
Poly(ADP-ribose) polymerase-1 (PARP-1) is a nuclear enzyme activated by binding to DNA breaks, which causes PARP-1 automodification. PARP-1 activation is required for regulating various cellular processes, including DNA repair and cell death induction. PARP-1 involved in these regulations is localized in the nucleoplasm, but approximately 40% of PARP-1 can be found in the nucleolus. Previously, we have reported that nucleolar PARP-1 is delocalized to the nucleoplasm in cells exposed to DNA-damaging agents. However, the functional roles of this delocalization in cellular response to DNA damage is not well understood, since this approach simultaneously induces the delocalization of PARP-1 and its automodification. We therefore devised an approach for separating these processes. Unmodified PARP-1 was first delocalized from the nucleolus using camptothecin. Then, PARP-1 was activated by exposure of cells to N-methyl-N'-nitro-N-nitrosoguanidine (MNNG). In contrast to treatment with MNNG alone, delocalization of PARP-1 by CPT, prior to its activation by MNNG, induced extensive automodification of PARP-1. DNA repair activity and consumption of intracellular NAD(+) were not affected by this activation. On the other hand, activation led to an increased formation of apoptotic cells, and this effect was suppressed by inhibition of PARP-1 activity. These results suggest that delocalization of PARP-1 from the nucleolus to the nucleoplasm sensitizes cells to DNA damage-induced apoptosis. As it has been suggested that the nucleolus has a role in stress sensing, nucleolar PARP-1 could participate in a process involved in nucleolus-mediated stress sensing.
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Affiliation(s)
- Ann Rancourt
- Department of Anatomy and Physiology, Division of Health and Environmental Research, Faculty of Medicine, Laval University Medical Centre (CHUQ), Laval University, Quebec, Canada
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29
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Cohausz O, Althaus FR. Role of PARP-1 and PARP-2 in the expression of apoptosis-regulating genes in HeLa cells. Cell Biol Toxicol 2008; 25:379-91. [DOI: 10.1007/s10565-008-9092-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2008] [Accepted: 05/30/2008] [Indexed: 11/24/2022]
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30
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Okada H, Inoue T, Kikuta T, Kato N, Kanno Y, Hirosawa N, Sakamoto Y, Sugaya T, Suzuki H. Poly(ADP-ribose) polymerase-1 enhances transcription of the profibrotic CCN2 gene. J Am Soc Nephrol 2008; 19:933-42. [PMID: 18287562 DOI: 10.1681/asn.2007060648] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
In the fibrotic kidney, tubular epithelial cells express CCN2, formerly known as connective tissue growth factor. Because little is known about the transcriptional regulation of this profibrotic protein, this study investigated the mechanism underlying epithelial cell-selective upregulation of CCN2 in fibrosis. It was found that a previously unidentified cis-regulatory element located in the promoter of the murine CCN2 gene plays an essential role in basal and TGF-beta1-induced gene transcription in tubular epithelial cells; this element acts in conjunction with the Smad-binding element and the basal control element-1. By protein mass fingerprint analysis and de novo sequencing, poly(ADP-ribose) polymerase-1 (PARP-1) was identified as a trans-acting protein factor that binds to this promoter region, which we termed the PARP-1-binding element. In vivo, knockdown of PARP-1 in proximal tubular epithelial cells significantly reduced CCN2 mRNA levels and attenuated interstitial fibrosis in the obstructed kidney. Thus, the PARP-1/PARP-1 binding element complex functions as a nonspecific, fundamental enhancer of both basal and induced CCN2 gene transcription in tubular epithelial cells. This regulatory complex may be a promising target for antifibrotic therapy.
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Affiliation(s)
- Hirokazu Okada
- Department of Nephrology, Saitama Medical University, 38 Morohongo, Moroyama-machi, Irumagun, Saitama 350-0451, Japan.
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Choi HS, Hwang CK, Kim CS, Song KY, Law PY, Loh HH, Wei LN. Transcriptional regulation of mouse mu opioid receptor gene in neuronal cells by poly(ADP-ribose) polymerase-1. J Cell Mol Med 2008; 12:2319-33. [PMID: 18266974 PMCID: PMC4514111 DOI: 10.1111/j.1582-4934.2008.00259.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
The pharmacological actions of morphine and morphine-like drugs such as heroin mediate primarily through the mu opioid receptor (MOR). It represents the target of the most valuable painkiller in contemporary medicine. Here we report that poly(ADP-ribose) polymerase 1 (PARP-1) binds to the double-stranded poly(C) element essential for the MOR promoter and represses promoter activity at the transcriptional level. We identified PARP-1 by affinity column chromatography using the double-stranded poly(C) element, followed by two-dimensional gel electrophoresis and MALDI-TOF mass spectrometry. PARP-1 binding to the poly(C) sequence of the MOR gene was sequence-specific as confirmed by the supershift assay. In cotransfection studies, PARP-1 repressed the MOR promoter only when the poly(C) sequence was intact. When PARP-1 was disrupted in NS20Y cells using siRNA, transcription of the endogenous target MOR gene increased significantly. Chromatin immunoprecipitation assays showed specific binding of PARP-1 to the double-stranded poly(C) element essential for the MOR promoter. Inhibition of PARP-1's catalytic domain with 3-aminobenzamide increased endogenous MOR mRNA levels in cultured NS20Y cells, suggesting that automodification of PARP-1 regulates MOR transcription. Our data suggest that PARP-1 can function as a repressor of MOR transcription dependent on the MOR poly(C) sequence. We demonstrate for the first time a role of PARP-1 as a transcriptional repressor in MOR gene regulation.
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Affiliation(s)
- Hack Sun Choi
- Department of Pharmacology, University of Minnesota Medical School, Minneapolis, Minnesota 55455, USA.
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Zaniolo K, Desnoyers S, Leclerc S, Guérin SL. Regulation of poly(ADP-ribose) polymerase-1 (PARP-1) gene expression through the post-translational modification of Sp1: a nuclear target protein of PARP-1. BMC Mol Biol 2007; 8:96. [PMID: 17961220 PMCID: PMC2175517 DOI: 10.1186/1471-2199-8-96] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2007] [Accepted: 10/25/2007] [Indexed: 01/09/2023] Open
Abstract
Background Poly(ADP-ribose) polymerase-1 (PARP-1) is a nuclear enzyme that plays critical functions in many biological processes, including DNA repair and gene transcription. The main function of PARP-1 is to catalyze the transfer of ADP-ribose units from nicotinamide adenine dinucleotide (NAD+) to a large array of acceptor proteins, which comprises histones, transcription factors, as well as PARP-1 itself. We have previously demonstrated that transcription of the PARP-1 gene essentially rely on the opposite regulatory actions of two distinct transcription factors, Sp1 and NFI. In the present study, we examined whether suppression of PARP-1 expression in embryonic fibroblasts derived from PARP-1 knockout mice (PARP-1-/-) might alter the expression and/or DNA binding properties of Sp1 and NFI. We also explored the possibility that Sp1 or NFI (or both) may represent target proteins of PARP-1 activity. Results Expression of both Sp1 and NFI was found to be considerably reduced in PARP-1-/- cells. Co-immunoprecipitation assays revealed that PARP-1 physically interacts with Sp1 in a DNA-independent manner, but neither with Sp3 nor NFI, in PARP-1+/+ cells. In addition, in vitro PARP assays indicated that PARP-1 could catalyze the addition of polymer of ADP-ribose to Sp1, which also translated into a reduction of Sp1 binding to its consensus DNA target site. Transfection of the PARP-1 promoter into both PARP-1+/+ and PARP-1-/- cells revealed that the lack of PARP-1 expression in PARP-1-/- cells also results in a strong increase in PARP-1 promoter activity. This influence of PARP-1 was found to rely on the presence of the Sp1 sites present on the basal PARP-1 promoter as their mutation entirely abolished the increased promoter activity observed in PARP-1-/- cells. Subjecting PARP-1+/+ cells to an oxidative challenge with hydrogen peroxide to increase PARP-1 activity translated into a dramatic reduction in the DNA binding properties of Sp1. However, its suppression by the inhibitor PJ34 improved DNA binding of Sp1 and led to a dramatic increase in PARP-1 promoter function. Conclusion Our results therefore recognized Sp1 as a target protein of PARP-1 activity, the addition of polymer of ADP-ribose to this transcription factor restricting its positive regulatory influence on gene transcription.
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Affiliation(s)
- Karine Zaniolo
- Oncology and Molecular Endocrinology Research Center, Centre de Recherche du CHUL-CHUQ and Département d'Anatomie-Physiologie, Université Laval, Québec, G1V 4G2, Canada.
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Korbelik M, Sun J, Payne PW. Activation of Poly(adenosine diphosphate-ribose) Polymerase in Mouse Tumors Treated by Photodynamic Therapy¶. Photochem Photobiol 2007. [DOI: 10.1562/0031-8655(2003)0780400aopdpi2.0.co2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Maruyama T, Nara K, Yoshikawa H, Suzuki N. Txk, a member of the non-receptor tyrosine kinase of the Tec family, forms a complex with poly(ADP-ribose) polymerase 1 and elongation factor 1alpha and regulates interferon-gamma gene transcription in Th1 cells. Clin Exp Immunol 2007; 147:164-75. [PMID: 17177976 PMCID: PMC1810450 DOI: 10.1111/j.1365-2249.2006.03249.x] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
We have found previously that Txk, a member of the Tec family tyrosine kinases, is involved importantly in T helper 1 (Th1) cytokine production. However, how Txk regulates interferon (IFN)-gamma gene transcription in human T lymphocytes was not fully elucidated. In this study, we identified poly(ADP-ribose) polymerase 1 (PARP1) and elongation factor 1alpha (EF-1alpha) as Txk-associated molecules that bound to the Txk responsive element of the IFN-gamma gene promoter. Txk phosphorylated EF-1alpha and PARP1 formed a complex with them, and bound to the IFN-gamma gene promoter in vitro. In particular, the N terminal region containing the DNA binding domain of PARP1 was important for the trimolecular complex formation involving Txk, EF-1alpha and PARP1. Several mutant Txk which lacked kinase activity were unable to form the trimolecular complex. A PARP1 inhibitor, PJ34, suppressed IFN-gamma but not interleukin (IL)-4 production by normal peripheral blood lymphocytes (PBL). Multi-colour confocal analysis revealed that Txk and EF-1alpha located in the cytoplasm in the resting condition. Upon activation, a complex involving Txk, EF-1alpha and PARP1 was formed and was located in the nucleus. Collectively, Txk in combination with EF-1alpha and PARP1 bound to the IFN-gamma gene promoter, and exerted transcriptional activity on the IFN-gamma gene.
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Affiliation(s)
- T Maruyama
- Departments of Immunology and Medicine, St Marianna University School of Medicine, Kawasaki, Japan
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Loss of Parp-1 affects gene expression profile in a genome-wide manner in ES cells and liver cells. BMC Genomics 2007; 8:41. [PMID: 17286852 PMCID: PMC1810537 DOI: 10.1186/1471-2164-8-41] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2006] [Accepted: 02/07/2007] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Many lines of evidence suggest that poly(ADP-ribose) polymerase-1 (Parp-1) is involved in transcriptional regulation of various genes as a coactivator or a corepressor by modulating chromatin structure. However, the impact of Parp-1-deficiency on the regulation of genome-wide gene expression has not been fully studied yet. RESULTS We employed a microarray analysis covering 12,488 genes and ESTs using mouse Parp-1-deficient (Parp-1-/-) embryonic stem (ES) cell lines and the livers of Parp-1-/- mice and their wild-type (Parp-1+/+) counterparts. Here, we demonstrate that of the 9,907 genes analyzed, in Parp-1-/- ES cells, 9.6% showed altered gene expression. Of these, 6.3% and 3.3% of the genes were down- or up-regulated by 2-fold or greater, respectively, compared with Parp-1+/+ ES cells (p < 0.05). In the livers of Parp-1-/- mice, of the 12,353 genes that were analyzed, 2.0% or 1.3% were down- and up-regulated, respectively (p < 0.05). Notably, the number of down-regulated genes was higher in both ES cells and livers, than that of the up-regulated genes. The genes that showed altered expression in ES cells or in the livers are ascribed to various cellular processes, including metabolism, signal transduction, cell cycle control and transcription. We also observed expression of the genes involved in the pathway of extraembryonic tissue development is augmented in Parp-1-/- ES cells, including H19. After withdrawal of leukemia inhibitory factor, expression of H19 as well as other trophoblast marker genes were further up-regulated in Parp-1-/- ES cells compared to Parp-1+/+ ES cells. CONCLUSION These results suggest that Parp-1 is required to maintain transcriptional regulation of a wide variety of genes on a genome-wide scale. The gene expression profiles in Parp-1-deficient cells may be useful to delineate the functional role of Parp-1 in epigenetic regulation of the genomes involved in various biological phenomena.
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Hernández P, Solé X, Valls J, Moreno V, Capellá G, Urruticoechea A, Pujana MA. Integrative analysis of a cancer somatic mutome. Mol Cancer 2007; 6:13. [PMID: 17280605 PMCID: PMC1797053 DOI: 10.1186/1476-4598-6-13] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2006] [Accepted: 02/05/2007] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The consecutive acquisition of genetic alterations characterizes neoplastic processes. As a consequence of these alterations, molecular interactions are reprogrammed in the context of highly connected and regulated cellular networks. The recent identification of the collection of somatically mutated genes in breast tumors (breast cancer somatic "mutome") allows the comprehensive study of its function and organization in complex networks. RESULTS We analyzed functional genomic data (loss of heterozygosity, copy number variation and gene expression in breast tumors) and protein binary interactions from public repositories to identify potential novel components of neoplastic processes, the functional relationships between them, and to examine their coordinated function in breast cancer pathogenesis. This analysis identified candidate tumor suppressors and oncogenes, and new genes whose expression level predicts survival rate in breast cancer patients. Mutome network modeling using different types of pathological and healthy functional relationships unveils functional modules significantly enriched in genes or proteins (genes/proteins) with related biological process Gene Ontology terms and containing known breast cancer-related genes/proteins. CONCLUSION This study presents a comprehensive analysis of the breast somatic mutome, highlighting those genes with a higher probability of playing a determinant role in tumorigenesis and better defining molecular interactions related to the neoplastic process.
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Affiliation(s)
- Pilar Hernández
- Bioinformatics and Biostatistics Unit, and Translational Research Laboratory, Catalan Institute of Oncology, IDIBELL, L'Hospitalet, Barcelona 08907, Spain
| | - Xavier Solé
- Bioinformatics and Biostatistics Unit, and Translational Research Laboratory, Catalan Institute of Oncology, IDIBELL, L'Hospitalet, Barcelona 08907, Spain
| | - Joan Valls
- Bioinformatics and Biostatistics Unit, and Translational Research Laboratory, Catalan Institute of Oncology, IDIBELL, L'Hospitalet, Barcelona 08907, Spain
| | - Víctor Moreno
- Bioinformatics and Biostatistics Unit, and Translational Research Laboratory, Catalan Institute of Oncology, IDIBELL, L'Hospitalet, Barcelona 08907, Spain
| | - Gabriel Capellá
- Bioinformatics and Biostatistics Unit, and Translational Research Laboratory, Catalan Institute of Oncology, IDIBELL, L'Hospitalet, Barcelona 08907, Spain
| | - Ander Urruticoechea
- Bioinformatics and Biostatistics Unit, and Translational Research Laboratory, Catalan Institute of Oncology, IDIBELL, L'Hospitalet, Barcelona 08907, Spain
| | - Miguel Angel Pujana
- Bioinformatics and Biostatistics Unit, and Translational Research Laboratory, Catalan Institute of Oncology, IDIBELL, L'Hospitalet, Barcelona 08907, Spain
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Martin-Oliva D, Aguilar-Quesada R, O'valle F, Muñoz-Gámez JA, Martínez-Romero R, García Del Moral R, Ruiz de Almodóvar JM, Villuendas R, Piris MA, Oliver FJ. Inhibition of poly(ADP-ribose) polymerase modulates tumor-related gene expression, including hypoxia-inducible factor-1 activation, during skin carcinogenesis. Cancer Res 2006; 66:5744-56. [PMID: 16740713 DOI: 10.1158/0008-5472.can-05-3050] [Citation(s) in RCA: 99] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Poly(ADP-ribose) polymerase (PARP)-1, an enzyme that catalyzes the attachment of ADP ribose to target proteins, acts as a component of enhancer/promoter regulatory complexes. In the present study, we show that pharmacologic inhibition of PARP-1 with 3,4-dihydro-5-[4-(1-piperidinyl)butoxyl]-1(2H)-isoquinolinone (DPQ) results in a strong delay in tumor formation and in a dramatic reduction in tumor size and multiplicity during 7,12-dimethylbenz(a)anthracene plus 12-O-tetradecanoylphorbol-13-acetate-induced skin carcinogenesis. This observation was parallel with a reduction in the skin inflammatory infiltrate in DPQ-treated mice and tumor vasculogenesis. Inhibition of PARP also affected activator protein-1 (AP-1) activation but not nuclear factor-kappaB (NF-kappaB). Using cDNA expression array analysis, a substantial difference in key tumor-related gene expression was found between chemically induced mice treated or not with PARP inhibitor and also between wild-type and parp-1 knockout mice. Most important differences were found in gene expression for Nfkbiz, S100a9, Hif-1alpha, and other genes involved in carcinogenesis and inflammation. These results were corroborated by real-time PCR. Moreover, the transcriptional activity of hypoxia-inducible factor-1alpha (HIF-1alpha) was compromised by PARP inhibition or in PARP-1-deficient cells, as measured by gene reporter assays and the expression of key target genes for HIF-1alpha. Tumor vasculature was also strongly inhibited in PARP-1-deficient mice and by DPQ. In summary, this study shows that inhibition of PARP on itself is able to control tumor growth, and PARP inhibition or genetic deletion of PARP-1 prevents from tumor promotion through their ability to cooperate with the activation AP-1, NF-kappaB, and HIF-1alpha.
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Affiliation(s)
- David Martin-Oliva
- Institute of Parasitology and Biomedicine, Consejo Superior de Investigaciones Cientificas, Granada, Spain
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Tantin D, Schild-Poulter C, Wang V, Haché RJG, Sharp PA. The octamer binding transcription factor Oct-1 is a stress sensor. Cancer Res 2006; 65:10750-8. [PMID: 16322220 DOI: 10.1158/0008-5472.can-05-2399] [Citation(s) in RCA: 90] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The POU-domain transcription factor Oct-1 is widely expressed in adult tissues and has been proposed to regulate a large group of target genes. Microarray expression profiling was used to evaluate gene expression changes in Oct-1-deficient mouse fibroblasts. A number of genes associated with cellular stress exhibited altered expression. Consistent with this finding, Oct-1-deficient fibroblasts were hypersensitive to gamma radiation, doxorubicin, and hydrogen peroxide and harbored elevated reactive oxygen species. Expression profiling identified a second group of genes dysregulated in Oct-1-deficient fibroblasts following irradiation, including many associated with oxidative and metabolic stress. A number of these genes contain octamer sequences in their immediate 5' regulatory regions, some of which are conserved in human. These results indicate that Oct-1 modulates the activity of genes important for the cellular response to stress.
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Affiliation(s)
- Dean Tantin
- Center for Cancer Research and Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA
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Pellicciari R, Camaioni E, Costantino G. 3. Life or death decisions: the cast of poly(ADP-ribose)polymerase (PARP) as a therapeutic target for brain ischaemia. PROGRESS IN MEDICINAL CHEMISTRY 2005; 42:125-69. [PMID: 15003720 DOI: 10.1016/s0079-6468(04)42003-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/07/2023]
Affiliation(s)
- Roberto Pellicciari
- Dipartimento di Chimica e Tecnologia del Farmaco, Via del Liceo 1, 06123 Perugia, Italy
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Tapodi A, Debreceni B, Hanto K, Bognar Z, Wittmann I, Gallyas F, Varbiro G, Sumegi B. Pivotal role of Akt activation in mitochondrial protection and cell survival by poly(ADP-ribose)polymerase-1 inhibition in oxidative stress. J Biol Chem 2005; 280:35767-75. [PMID: 16115861 DOI: 10.1074/jbc.m507075200] [Citation(s) in RCA: 137] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
According to the classical view, the cytoprotective effect of inhibitors of poly(ADP-ribose)polymerase (PARP) in oxidative stress was based on the prevention of NAD+ and ATP depletion, thus the attenuation of necrosis. Our previous data on PARP inhibitors in an inflammatory model suggested that PARP-catalyzed ADP-ribosylations may affect signaling pathways, which can play a significant role in cell survival. To clarify the molecular mechanism of cytoprotection, PARP activity was inhibited pharmacologically by suppressing PARP-1 expression by a small interfering RNA (siRNA) technique or by transdominantly expressing the N-terminal DNA-binding domain of PARP-1 (PARP-DBD) in cultured cells. Cell survival, activation of the phosphatidylinositol 3-kinase (PI3-kinase)/Akt system, and the preservation of mitochondrial membrane potential were studied in hydrogen peroxide-treated WRL-68 cells. Our data showed that suppression of the single-stranded DNA break-induced PARP-1 activation by pharmacological inhibitor, siRNA, or by the transdominant expression of PARP-DBD protected cells from oxidative stress and induced the phosphorylation and activation of Akt. Furthermore, prevention of Akt activation by inhibiting PI3-kinase counteracted the cytoprotective effect of PARP inhibition. Microscopy data showed that PARP inhibition-induced Akt activation was responsible for protection of mitochondria in oxidative stress because PI3-kinase inhibitors diminished the protective effect of PARP inhibition. Similarly, Src kinase inhibitors, which decrease Akt phosphorylation, also counteracted the protection of mitochondrial membrane potential supporting the pivotal role of Akt in cytoprotection. These data together with the finding that PARP inhibition in the absence of oxidative stress induced the phosphorylation and activation of Akt indicate that PARP inhibition-induced Akt activation is dominantly responsible for the cytoprotection in oxidative stress.
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Affiliation(s)
- Antal Tapodi
- Department of Biochemistry and Medical Chemistry, Faculty of Medicine, University of Pecs, Hungary
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Xu J, Keeton AB, Wu L, Franklin JL, Cao X, Messina JL. Gene 33 inhibits apoptosis of breast cancer cells and increases poly(ADP-ribose) polymerase expression. Breast Cancer Res Treat 2005; 91:207-15. [PMID: 15952054 DOI: 10.1007/s10549-005-1040-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
The structure of the Gene 33 protein suggests that it plays a role in intracellular signaling and Gene 33 is induced by many mitogenic and stressful stimuli. Previously, we found that Gene 33 expression is significantly induced by retinoic acid (RA), insulin and synergistically by both in a liver-derived cell line. In the present study, we investigated the basal expression and regulation of Gene 33 in multiple human breast cancer cell lines. These cell lines expressed different levels of Gene 33 protein, but Gene 33 protein was not regulated by RA or insulin, either alone, or in combination. However, epidermal growth factor (EGF) induced Gene 33 expression in SK-BR-3 cells and this induction was inhibited by co-treatment with RA. There was a strong correlation between endogenous basal Gene 33 expression and doubling time. Exogenous expression of Gene 33 in MCF-7 cells did not affect cell cycle distribution, but inhibited apoptosis and specifically increased the level of Poly(ADP-ribose) Polymerase (PARP-1) protein. This suggests that Gene 33 promotes breast cancer cell growth by an anti-apoptotic rather than a mitogenic effect, possibly involving up-regulation of PARP-1.
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Affiliation(s)
- Jie Xu
- Department of Pathology, Division of Molecular and Cellular Pathology, University of Alabama, Birmingham, AL 35294-0019, USA
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Chiba-Falek O, Kowalak JA, Smulson ME, Nussbaum RL. Regulation of alpha-synuclein expression by poly (ADP ribose) polymerase-1 (PARP-1) binding to the NACP-Rep1 polymorphic site upstream of the SNCA gene. Am J Hum Genet 2005; 76:478-92. [PMID: 15672325 PMCID: PMC1196399 DOI: 10.1086/428655] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2004] [Accepted: 01/06/2005] [Indexed: 12/22/2022] Open
Abstract
Alleles at NACP-Rep1, the polymorphic microsatellite repeat located approximately 10 kb upstream of the alpha -synuclein gene (SNCA), are associated, in some reports, with differing risks of sporadic Parkinson disease (PD). We showed previously that NACP-Rep1 acts as a negative modulator of SNCA transcription, with an effect that varied threefold among different NACP-Rep1 alleles. Given that duplications and triplications of SNCA have been implicated in familial Parkinson disease (PD), even a 1.5-2-fold increase in alpha -synuclein expression may, over many decades, contribute to PD. Thus, the association of different NACP-Rep1 alleles with PD may be a consequence of polymorphic differences in transcriptional regulation of SNCA. Here we aimed to identify the factor(s) that bind to NACP-Rep1 and potentially contribute to SNCA transcriptional modulation, by pulling down proteins that bind to NACP-Rep1 and identifying them by mass spectrometry. One of these proteins was poly-(ADP-ribose) transferase/polymerase-1 (PARP-1), a DNA-binding protein and transcriptional regulator. Electrophoresis mobility shift and chromatin immunoprecipitation assays showed specific binding of PARP-1 to NACP-Rep1. Inhibition of PARP-1's catalytic domain increased the endogenous SNCA mRNA levels in cultured SH-SY5Y cells. Furthermore, PARP-1 binding to NACP-Rep1 specifically reduced the transcriptional activity of the SNCA promoter/enhancer in luciferase reporter assays. This down-regulation effect of PARP-1 depended on NACP-Rep1 being present in the construct and was abrogated by inhibiting PARP-1's catalytic activity with 3-aminobenzamide. The association of different NACP-Rep1 alleles with PD may be mediated, in part, by the effect of PARP-1, as well as other factors, on SNCA expression.
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Affiliation(s)
- Ornit Chiba-Falek
- Genetic Disease Research Branch, National Human Genome Research Institute, and Laboratory of Neurotoxicology, National Institute of Mental Health, National Institutes of Health, Bethesda, MD; and Department of Biochemistry and Molecular Biology, Georgetown University Medical Center, Washington, DC
| | - Jeffrey A. Kowalak
- Genetic Disease Research Branch, National Human Genome Research Institute, and Laboratory of Neurotoxicology, National Institute of Mental Health, National Institutes of Health, Bethesda, MD; and Department of Biochemistry and Molecular Biology, Georgetown University Medical Center, Washington, DC
| | - Mark E. Smulson
- Genetic Disease Research Branch, National Human Genome Research Institute, and Laboratory of Neurotoxicology, National Institute of Mental Health, National Institutes of Health, Bethesda, MD; and Department of Biochemistry and Molecular Biology, Georgetown University Medical Center, Washington, DC
| | - Robert L. Nussbaum
- Genetic Disease Research Branch, National Human Genome Research Institute, and Laboratory of Neurotoxicology, National Institute of Mental Health, National Institutes of Health, Bethesda, MD; and Department of Biochemistry and Molecular Biology, Georgetown University Medical Center, Washington, DC
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Nakajima H, Nagaso H, Kakui N, Ishikawa M, Hiranuma T, Hoshiko S. Critical role of the automodification of poly(ADP-ribose) polymerase-1 in nuclear factor-kappaB-dependent gene expression in primary cultured mouse glial cells. J Biol Chem 2004; 279:42774-86. [PMID: 15302869 DOI: 10.1074/jbc.m407923200] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Synthesis of ADP-ribose polymers catalyzed by poly-(ADP-ribose) polymerase-1 (PARP-1) has been implicated in transcriptional regulation. Recent studies with PARP-1 null mice and PARP-1 inhibitors have also demonstrated that PARP-1 has an essential role in nuclear factor-kappaB (NF-kappaB)-dependent gene expression induced by various inflammatory stimuli. In this study, we used primary cultured mouse glial cells to investigate the role of poly(ADP-ribosyl)ation by PARP-1 in NF-kappaB-dependent gene expression. PARP-1 inhibitors and the antisense RNA for PARP-1 mRNA suppressed lipopolysaccharide (LPS)-induced expression of tumor necrosis factor-alpha and inducible nitric-oxide synthase, suggesting that PARP-1 activity has a critical role in synthesis. Western blotting with anti-poly(ADP-ribose) antibody revealed that PARP-1 itself was mainly poly(ADP-ribosyl)ated in glial cells, i.e. automodified PARP-1 (AM-PARP). The amounts of AM-PARP were not affected by LPS treatment, but were decreased by PARP-1 inhibitors. Electrophoretic mobility shift assay revealed that PARP-1 inhibitors and the antisense RNA for PARP-1 mRNA reduced the LPS-induced DNA binding of NF-kappaB. Non-modified PARP-1 also reduced the DNA binding of NF-kappaB via its physical association with NF-kappaB, whereas AM-PARP had no effect. On the other hand, enhancement of the automodification of PARP-1 by the addition of NAD+, its substrate, promoted the DNA binding of NF-kappaB. Furthermore, in in vitro transcription assay, the addition of AM-PARP or NAD+ to nuclear extracts promoted NF-kappaB p50-dependent transcription. These results indicate that automodification of PARP-1 positively up-regulates formation of the NF-kappaB.DNA complex and enhances transcriptional activation. Therefore, AM-PARP may be critical for the NF-kappaB-dependent gene expression of some inflammatory mediators in glial cells.
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Affiliation(s)
- Hidemitsu Nakajima
- Pharmaceutical Research Center, Meiji Seika Kaisha Limited, 760 Moro-oka-cho, Kohoku-ku, Yokohama 222-8567, Japan
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Yung TMC, Sato S, Satoh MS. Poly(ADP-ribosyl)ation as a DNA damage-induced post-translational modification regulating poly(ADP-ribose) polymerase-1-topoisomerase I interaction. J Biol Chem 2004; 279:39686-96. [PMID: 15247263 DOI: 10.1074/jbc.m402729200] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Poly(ADP-ribosyl)ation is a post-translational modification that occurs immediately after exposure of cells to DNA damaging agents. In vivo, 90% of ADP-ribose polymers are attached to the automodification domain of poly(ADP-ribose) polymerase-1 (PARP-1), the main enzyme catalyzing this modification reaction. This enzyme forms complexes with transcription initiation, DNA replication, and DNA repair factors. In most known cases, the interactions occur through the automodification domain. However, functional implications of the automodification reaction on these interactions have not yet been elucidated. In the present study, we created fluorescent protein-tagged PARP-1 to study this enzyme in live cells and focused on the interaction between PARP-1 and topoisomerase I (Topo I), one of the enzymes that interacts with PARP-1 in vitro. Here, we demonstrate that PARP-1 co-localizes with Topo I throughout the cell cycle. Results from bioluminescence resonance energy transfer assays suggest that the co-localization is because of a direct protein-protein interaction. In response to DNA damage, PARP-1 de-localization and a reduction in bioluminescence resonance energy transfer signal because of the automodification reaction are observed, suggesting that the automodification reaction results in the disruption of the interaction between PARP-1 and Topo I. Because Topo I activity has been reported to be promoted by PARP-1, we then investigated the effect of the disruption of this interaction on Topo I activity, and we found that this disruption results in the reduction of Topo I activity. These results suggest that a function for the automodification reaction is to regulate the interaction between PARP-1 and Topo I, and consequently, the Topo I activity, in response to DNA damage.
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Affiliation(s)
- Tetsu M C Yung
- Laboratory of DNA Repair, Health and Environment Unit, Laval University Medical Center, CHUQ, Faculty of Medicine, Laval University, Ste-Foy, Quebec G1V 4G2, Canada
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Masutani M, Nakagama H, Sugimura T. Poly(ADP-ribose) and carcinogenesis. Genes Chromosomes Cancer 2004; 38:339-48. [PMID: 14566854 DOI: 10.1002/gcc.10250] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Poly(ADP-ribose) and poly(ADP-ribose) polymerase (PARP) were discovered about 40 years ago, but their significance was not well elucidated until recently. In the early stage of the history of PARP, the presence of antibodies in the sera of human patients with lupus erythematosus indicated its natural occurrence. PARP, as well as the degrading enzyme, poly(ADP-ribose) glycohydrolase (PARG), are present in most eukaryotes except for yeasts. Studies that used inhibitors of PARP indicated the involvement of PARP and poly(ADP-ribose) in DNA damage repair, and eventually PARP was purified and the gene was cloned. Molecular analysis then revealed various functional domains, such as the one for binding to strand breaks of DNA. Parp-1-deficient and Parg-deficient cells showed, in general, enhanced sensitivity to the lethal effects of ionizing radiation and alkylating agents. Parp-1 knockout mouse embryonic stem cells developed into teratocarcinoma-like tumors when injected subcutaneously into nude mice, these tumors featuring giant cells similar to syncytiotrophoblastic giant cells with hyperploidy. Parp-1 was also found in centrosomes, suggesting that poly(ADP-ribose) and PARP-1 are functionally involved in the maintenance of chromatin structure and the equal distribution of chromosomes into daughter cells. Intriguing findings on the real biological significance continue to be generated, with new light shed on mechanisms of carcinogenesis and pointing to novel cancer treatments. Highlights during the last four decades of studies by laboratories focusing on poly(ADP-ribose)/PARP, including our own, are condensed and summarized in this review.
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Affiliation(s)
- Mitsuko Masutani
- Biochemistry Division, National Cancer Center Research Institute, Tokyo, Japan.
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Caldini R, Barletta E, Del Rosso M, Giovannelli L, Chevanne M. FGF2-mediated upregulation of urokinase-type plasminogen activator expression requires a MAP-kinase dependent activation of poly(ADP-ribose) polymerase. J Cell Physiol 2004; 202:125-34. [PMID: 15389540 DOI: 10.1002/jcp.20096] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Poly(ADP-ribosyl)ation is a post-translational modification of protein occurring in the nucleus by poly(ADP-ribose) polymerase enzyme activity. The main role of poly(ADP-ribose) polymerase system as "nick sensor" and DNA breaks repair is based on its activation via DNA strand breaks. Furthermore, poly(ADP-ribose) polymerase modifies the binding to DNA of several transcriptional factors by poly(ADP-ribosyl)ation, thereby regulating also transcriptional gene expression. We have analyzed whether poly(ADP-ribose) polymerase activity is involved in basic fibroblast growth factor (FGF2)-mediated upregulation of urokinase-type plasminogen activator (uPA) mRNA. We demonstrated that specific inhibition of poly(ADP-ribose) polymerase activity via 3-aminobenzamide (3ABA) or NAD+ deprivation prevents FGF2-mediated uPA mRNA over-expression and cell-associated plasminogen activator (PA) production in GM7373 endothelial cell line. We verified that FGF2 stimulates poly(ADP-ribose) polymerase activity by a DNA strand breaks-independent manner which involves a mitogen-activated protein kinases (MAPK)-dependent pathway, as confirmed by using PD98059 inhibitor and anisomycin stimulation. Poly(ADP-ribose) polymerase involved in this mechanism is mainly the 60 kDa molecular mass isoform, that presents an increase in serine phosphorylation in the presence of FGF2.
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Affiliation(s)
- Riccardo Caldini
- Department of Experimental Pathology and Oncology, University of Florence, Italy
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Simbulan-Rosenthal CM, Rosenthal DS, Luo R, Samara R, Espinoza LA, Hassa PO, Hottiger MO, Smulson ME. PARP-1 binds E2F-1 independently of its DNA binding and catalytic domains, and acts as a novel coactivator of E2F-1-mediated transcription during re-entry of quiescent cells into S phase. Oncogene 2003; 22:8460-71. [PMID: 14627987 DOI: 10.1038/sj.onc.1206897] [Citation(s) in RCA: 80] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The transcription factor E2F-1 is implicated in the activation of S-phase genes as well as induction of apoptosis, and is regulated by interactions with Rb and by cell cycle-dependent alterations in E2F-1 abundance. We earlier demonstrated a pivotal role for poly(ADP-ribose) polymerase-1 (PARP-1) in the regulation of E2F-1 expression and promoter activity during S-phase re-entry when quiescent cells re-enter the cell cycle. We now investigate the putative mechanism(s) by which PARP-1 may upregulate E2F-1 promoter activity during S-phase re-entry. DNase-1 footprint assays with purified PARP-1 showed that PARP-1 did not directly bind the E2F-1 promoter in a sequence-specific manner. In contrast to p53, a positive acceptor in poly(ADP-ribosyl)ation reactions, E2F-1 was not poly(ADP-ribosyl)ated by wild-type PARP-1 in vitro, indicating that PARP-1 does not exert a dual effect on E2F-1 transcriptional activation. Protein-binding reactions and coimmunoprecipitation experiments with purified PARP-1 and E2F-1, however, revealed that PARP-1 binds to E2F-1 in vitro. More significantly, physical association of PARP-1 and E2F-1 in vivo also occurred in wild-type fibroblasts 5 h after re-entry into S phase, coincident with the increase in E2F-1 promoter activity and expression of E2F-1-responsive S-phase genes cyclin A and c-Myc. Mapping of the interaction domains revealed that full-length PARP-1 as well as PARP-1 mutants lacking either the catalytic active site or the DNA-binding domain equally bind E2F-1, whereas a PARP-1 mutant lacking the automodification domain does not, suggesting that the protein interaction site is located in this central domain. Finally, gel shift analysis with end-blocked E2F-1 promoter sequence probes verified that the binding of PARP-1 to E2F-1 enhances binding to the E2F-1 promoter, indicating that PARP-1 acts as a positive cofactor of E2F-1-mediated transcription.
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Affiliation(s)
- Cynthia M Simbulan-Rosenthal
- Department of Biochemistry and Molecular Biology, Georgetown University School of Medicine, Washington, DC 20007, USA.
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Zingarelli B, Hake PW, O'Connor M, Denenberg A, Wong HR, Kong S, Aronow BJ. Differential regulation of activator protein-1 and heat shock factor-1 in myocardial ischemia and reperfusion injury: role of poly(ADP-ribose) polymerase-1. Am J Physiol Heart Circ Physiol 2003; 286:H1408-15. [PMID: 14670820 DOI: 10.1152/ajpheart.00953.2003] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Poly(ADP-ribose) polymerase-1 (PARP-1), a nuclear enzyme activated in response to DNA strand breaks, has been implicated in cell dysfunction in myocardial reperfusion injury. PARP-1 has also been shown to participate in transcription and regulation of gene expression. In this study, we investigated the role of PARP-1 on the signal transduction pathway of activator protein-1 (AP-1) and heat shock factor-1 (HSF-1) in myocardial reperfusion injury. Mice genetically deficient of PARP-1 (PARP-1(-/-) mice) exhibited a significant reduction of myocardial damage after occlusion and reperfusion of the left anterior descending branch of the coronary artery compared with their wild-type littermates. This cardioprotection was associated with a reduction of the phosphorylative activity of JNK and, subsequently, reduction of the DNA binding of the signal transduction factor AP-1. On the contrary, in PARP-1(-/-) mice, DNA binding of HSF-1 was enhanced and was associated with a significant increase of the cardioprotective heat shock protein (HSP)70 compared with wild-type mice. Microarray analysis revealed that expression of several AP-1-dependent genes of proinflammatory mediators and HSPs was altered in PARP-1(-/-) mice. The data indicate that PARP-1 may exert a pathological role in reperfusion injury by functioning as an enhancing factor of AP-1 activation and as a repressing factor of HSF-1 activation and HSP70 expression.
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Affiliation(s)
- Basilia Zingarelli
- Division of Critical Care Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio 45229, USA.
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Quesada P, Malanga M, Di Meglio S, De Lorenzo S, Fabbrocini A, Garbi C, Bianco AR, Pepe S. Recombinant IFN-alpha2b treatment activates poly (ADPR) polymerase-1 (PARP-1) in KB cancer cells. Eur J Cancer 2003; 39:2103-9. [PMID: 12957467 DOI: 10.1016/s0959-8049(03)00433-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
In the present paper, we investigated the relationship between the growth inhibitory effects of recombinant interferon-alpha2b (rIFN-alpha2b) and poly (ADPR) polymerase-1 (PARP-1) activity in the human squamous KB cancer cell line. Growth inhibition of the KB cells mediated by 1000 IU/ml of rIFN-alpha2b was accompanied by a transient rise in PARP-1 specific activity 24 h after rIFN-alpha2b treatment, confirmed by both the increase of intracellular poly (ADP-ribose) content and the PARP-1 auto-modification level. At longer times of incubation, the onset of apoptosis accompanied KB cell growth inhibition, as demonstrated by both flow cytometry and western-blotting analysis showing an 89 kDa apoptotic fragment of PARP-1. Moreover, pretreatment of the cells with the PARP-1 inhibitor, 3-aminobenzamide (3-ABA), at non-cytotoxic concentrations (1 mM), reduced the cell-growth inhibition, cell-cycle perturbation and apoptosis caused by rIFN-alpha2b. Taken together, these results strongly suggest that PARP-1 may be directly involved in the effects of rIFN-alpha2b in the KB cancer cell line.
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Affiliation(s)
- P Quesada
- Department of Biological Chemistry, University Federico II, Naples, Italy
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Zingarelli B, Hake PW, O’Connor M, Denenberg A, Kong S, Aronow BJ. Absence of Poly(ADP-ribose) Polymerase-1 Alters Nuclear Factor-κB Activation and Gene Expression of Apoptosis Regulators after Reperfusion Injury. Mol Med 2003. [DOI: 10.1007/bf03402179] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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