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Nie L, Wang C, Huang M, Liu X, Feng X, Tang M, Li S, Hang Q, Teng H, Shen X, Ma L, Gan B, Chen J. DePARylation is critical for S phase progression and cell survival. eLife 2024; 12:RP89303. [PMID: 38578205 PMCID: PMC10997334 DOI: 10.7554/elife.89303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/06/2024] Open
Abstract
Poly(ADP-ribose)ylation or PARylation by PAR polymerase 1 (PARP1) and dePARylation by poly(ADP-ribose) glycohydrolase (PARG) are equally important for the dynamic regulation of DNA damage response. PARG, the most active dePARylation enzyme, is recruited to sites of DNA damage via pADPr-dependent and PCNA-dependent mechanisms. Targeting dePARylation is considered an alternative strategy to overcome PARP inhibitor resistance. However, precisely how dePARylation functions in normal unperturbed cells remains elusive. To address this challenge, we conducted multiple CRISPR screens and revealed that dePARylation of S phase pADPr by PARG is essential for cell viability. Loss of dePARylation activity initially induced S-phase-specific pADPr signaling, which resulted from unligated Okazaki fragments and eventually led to uncontrolled pADPr accumulation and PARP1/2-dependent cytotoxicity. Moreover, we demonstrated that proteins involved in Okazaki fragment ligation and/or base excision repair regulate pADPr signaling and cell death induced by PARG inhibition. In addition, we determined that PARG expression is critical for cellular sensitivity to PARG inhibition. Additionally, we revealed that PARG is essential for cell survival by suppressing pADPr. Collectively, our data not only identify an essential role for PARG in normal proliferating cells but also provide a potential biomarker for the further development of PARG inhibitors in cancer therapy.
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Affiliation(s)
- Litong Nie
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer CenterHoustonUnited States
| | - Chao Wang
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer CenterHoustonUnited States
| | - Min Huang
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer CenterHoustonUnited States
| | - Xiaoguang Liu
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer CenterHoustonUnited States
| | - Xu Feng
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer CenterHoustonUnited States
| | - Mengfan Tang
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer CenterHoustonUnited States
| | - Siting Li
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer CenterHoustonUnited States
| | - Qinglei Hang
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer CenterHoustonUnited States
| | - Hongqi Teng
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer CenterHoustonUnited States
| | - Xi Shen
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer CenterHoustonUnited States
- Institute for Personalized Cancer Therapy, The University of Texas MD Anderson Cancer CenterHoustonUnited States
| | - Li Ma
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer CenterHoustonUnited States
| | - Boyi Gan
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer CenterHoustonUnited States
| | - Junjie Chen
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer CenterHoustonUnited States
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2
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Andronikou C, Burdova K, Dibitetto D, Lieftink C, Malzer E, Kuiken HJ, Gogola E, Ray Chaudhuri A, Beijersbergen RL, Hanzlikova H, Jonkers J, Rottenberg S. PARG-deficient tumor cells have an increased dependence on EXO1/FEN1-mediated DNA repair. EMBO J 2024; 43:1015-1042. [PMID: 38360994 PMCID: PMC10943112 DOI: 10.1038/s44318-024-00043-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Revised: 01/22/2024] [Accepted: 01/23/2024] [Indexed: 02/17/2024] Open
Abstract
Targeting poly(ADP-ribose) glycohydrolase (PARG) is currently explored as a therapeutic approach to treat various cancer types, but we have a poor understanding of the specific genetic vulnerabilities that would make cancer cells susceptible to such a tailored therapy. Moreover, the identification of such vulnerabilities is of interest for targeting BRCA2;p53-deficient tumors that have acquired resistance to poly(ADP-ribose) polymerase inhibitors (PARPi) through loss of PARG expression. Here, by performing whole-genome CRISPR/Cas9 drop-out screens, we identify various genes involved in DNA repair to be essential for the survival of PARG;BRCA2;p53-deficient cells. In particular, our findings reveal EXO1 and FEN1 as major synthetic lethal interactors of PARG loss. We provide evidence for compromised replication fork progression, DNA single-strand break repair, and Okazaki fragment processing in PARG;BRCA2;p53-deficient cells, alterations that exacerbate the effects of EXO1/FEN1 inhibition and become lethal in this context. Since this sensitivity is dependent on BRCA2 defects, we propose to target EXO1/FEN1 in PARPi-resistant tumors that have lost PARG activity. Moreover, EXO1/FEN1 targeting may be a useful strategy for enhancing the effect of PARG inhibitors in homologous recombination-deficient tumors.
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Affiliation(s)
- Christina Andronikou
- Institute of Animal Pathology, Vetsuisse Faculty, University of Bern, 3012, Bern, Switzerland
- Division of Molecular Pathology, The Netherlands Cancer Institute, 1066CX, Amsterdam, The Netherlands
- Oncode Institute, Amsterdam, The Netherlands
- Cancer Therapy Resistance Cluster and Bern Center for Precision Medicine, Department for Biomedical Research, University of Bern, 3088, Bern, Switzerland
| | - Kamila Burdova
- Laboratory of Genome Dynamics, Institute of Molecular Genetics of the Czech Academy of Sciences, 142 20, Prague 4, Czech Republic
| | - Diego Dibitetto
- Institute of Animal Pathology, Vetsuisse Faculty, University of Bern, 3012, Bern, Switzerland
- Cancer Therapy Resistance Cluster and Bern Center for Precision Medicine, Department for Biomedical Research, University of Bern, 3088, Bern, Switzerland
| | - Cor Lieftink
- Division of Molecular Carcinogenesis, The Netherlands Cancer Institute, 1066CX, Amsterdam, The Netherlands
- The Netherlands Cancer Institute Robotics and Screening Center, The Netherlands Cancer Institute, 1066CX, Amsterdam, The Netherlands
| | - Elke Malzer
- Division of Molecular Carcinogenesis, The Netherlands Cancer Institute, 1066CX, Amsterdam, The Netherlands
- The Netherlands Cancer Institute Robotics and Screening Center, The Netherlands Cancer Institute, 1066CX, Amsterdam, The Netherlands
| | - Hendrik J Kuiken
- Division of Molecular Carcinogenesis, The Netherlands Cancer Institute, 1066CX, Amsterdam, The Netherlands
- The Netherlands Cancer Institute Robotics and Screening Center, The Netherlands Cancer Institute, 1066CX, Amsterdam, The Netherlands
| | - Ewa Gogola
- Division of Molecular Pathology, The Netherlands Cancer Institute, 1066CX, Amsterdam, The Netherlands
| | - Arnab Ray Chaudhuri
- Department of Molecular Genetics, Erasmus MC Cancer Institute, Erasmus University Medical Center, 3015GD, Rotterdam, The Netherlands
| | - Roderick L Beijersbergen
- Division of Molecular Carcinogenesis, The Netherlands Cancer Institute, 1066CX, Amsterdam, The Netherlands
- The Netherlands Cancer Institute Robotics and Screening Center, The Netherlands Cancer Institute, 1066CX, Amsterdam, The Netherlands
| | - Hana Hanzlikova
- Institute of Animal Pathology, Vetsuisse Faculty, University of Bern, 3012, Bern, Switzerland
- Laboratory of Genome Dynamics, Institute of Molecular Genetics of the Czech Academy of Sciences, 142 20, Prague 4, Czech Republic
| | - Jos Jonkers
- Division of Molecular Pathology, The Netherlands Cancer Institute, 1066CX, Amsterdam, The Netherlands.
- Oncode Institute, Amsterdam, The Netherlands.
| | - Sven Rottenberg
- Institute of Animal Pathology, Vetsuisse Faculty, University of Bern, 3012, Bern, Switzerland.
- Division of Molecular Pathology, The Netherlands Cancer Institute, 1066CX, Amsterdam, The Netherlands.
- Cancer Therapy Resistance Cluster and Bern Center for Precision Medicine, Department for Biomedical Research, University of Bern, 3088, Bern, Switzerland.
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3
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Nie L, Wang C, Huang M, Liu X, Feng X, Tang M, Li S, Hang Q, Teng H, Shen X, Ma L, Gan B, Chen J. DePARylation is critical for S phase progression and cell survival. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2023.07.31.551317. [PMID: 37577639 PMCID: PMC10418084 DOI: 10.1101/2023.07.31.551317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/15/2023]
Abstract
Poly(ADP-ribose)ylation or PARylation by PAR polymerase 1 (PARP1) and dePARylation by poly(ADP-ribose) glycohydrolase (PARG) are equally important for the dynamic regulation of DNA damage response. PARG, the most active dePARylation enzyme, is recruited to sites of DNA damage via pADPr-dependent and PCNA-dependent mechanisms. Targeting dePARylation is considered an alternative strategy to overcome PARP inhibitor resistance. However, precisely how dePARylation functions in normal unperturbed cells remains elusive. To address this challenge, we conducted multiple CRISPR screens and revealed that dePARylation of S phase pADPr by PARG is essential for cell viability. Loss of dePARylation activity initially induced S phase-specific pADPr signaling, which resulted from unligated Okazaki fragments and eventually led to uncontrolled pADPr accumulation and PARP1/2-dependent cytotoxicity. Moreover, we demonstrated that proteins involved in Okazaki fragment ligation and/or base excision repair regulate pADPr signaling and cell death induced by PARG inhibition. In addition, we determined that PARG expression is critical for cellular sensitivity to PARG inhibition. Additionally, we revealed that PARG is essential for cell survival by suppressing pADPr. Collectively, our data not only identify an essential role for PARG in normal proliferating cells but also provide a potential biomarker for the further development of PARG inhibitors in cancer therapy.
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Affiliation(s)
- Litong Nie
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Chao Wang
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Min Huang
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Xiaoguang Liu
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Xu Feng
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Mengfan Tang
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Siting Li
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Qinglei Hang
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Hongqi Teng
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Xi Shen
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
- Institute for Personalized Cancer Therapy, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Li Ma
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Boyi Gan
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Junjie Chen
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
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4
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Kołacz K, Robaszkiewicz A. PARP1 at the crossroad of cellular senescence and nucleolar processes. Ageing Res Rev 2024; 94:102206. [PMID: 38278370 DOI: 10.1016/j.arr.2024.102206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2023] [Revised: 01/09/2024] [Accepted: 01/22/2024] [Indexed: 01/28/2024]
Abstract
Senescent cells that occur in response to telomere shortening, oncogenes, extracellular and intracellular stress factors are characterized by permanent cell cycle arrest, the morphological and structural changes of the cell that include the senescence-associated secretory phenotype (SASP) and nucleoli rearrangement. The associated DNA lesions induce DNA damage response (DDR), which activates the DNA repair protein - poly-ADP-ribose polymerase 1 (PARP1). This protein consumes NAD+ to synthesize ADP-ribose polymer (PAR) on its own protein chain and on other interacting proteins. The involvement of PARP1 in nucleoli processes, such as rRNA transcription and ribosome biogenesis, the maintenance of heterochromatin and nucleoli structure, as well as controlling the crucial DDR protein release from the nucleoli to nucleus, links PARP1 with cellular senescence and nucleoli functioning. In this review we describe and discuss the impact of PARP1-mediated ADP-ribosylation on early cell commitment to senescence with the possible role of senescence-induced PARP1 transcriptional repression and protein degradation on nucleoli structure and function. The cause-effect interplay between PARP1 activation/decline and nucleoli functioning during senescence needs to be studied in detail.
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Affiliation(s)
- Kinga Kołacz
- Department of General Biophysics, Faculty of Biology and Environmental Protection, University of Lodz, Pomorska 141/143, 90-236 Lodz, Poland; Bio-Med-Chem Doctoral School of the University of Lodz and Lodz Institutes of the Polish Academy of Sciences, University of Lodz, Banacha 12 /16, 90-237 Lodz, Poland.
| | - Agnieszka Robaszkiewicz
- Department of General Biophysics, Faculty of Biology and Environmental Protection, University of Lodz, Pomorska 141/143, 90-236 Lodz, Poland; Johns Hopkins University School of Medicine, Institute for Fundamental Biomedical Research (IFBR), 600 5th Street South, St. Petersburgh, FL 33701, USA.
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5
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Chen L, Tang Q, Zhang K, Huang Q, Ding Y, Jin B, Liu S, Hwa K, Chou CJ, Zhang Y, Thyparambil S, Liao W, Han Z, Mortensen R, Schilling J, Li Z, Heaton R, Tian L, Cohen HJ, Sylvester KG, Arent RC, Zhao X, McElhinney DB, Wu Y, Bai W, Ling XB. Altered expression of the L-arginine/nitric oxide pathway in ovarian cancer: metabolic biomarkers and biological implications. BMC Cancer 2023; 23:844. [PMID: 37684587 PMCID: PMC10492322 DOI: 10.1186/s12885-023-11192-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Accepted: 07/19/2023] [Indexed: 09/10/2023] Open
Abstract
MOTIVATION Ovarian cancer (OC) is a highly lethal gynecological malignancy. Extensive research has shown that OC cells undergo significant metabolic alterations during tumorigenesis. In this study, we aim to leverage these metabolic changes as potential biomarkers for assessing ovarian cancer. METHODS A functional module-based approach was utilized to identify key gene expression pathways that distinguish different stages of ovarian cancer (OC) within a tissue biopsy cohort. This cohort consisted of control samples (n = 79), stage I/II samples (n = 280), and stage III/IV samples (n = 1016). To further explore these altered molecular pathways, minimal spanning tree (MST) analysis was applied, leading to the formulation of metabolic biomarker hypotheses for OC liquid biopsy. To validate, a multiple reaction monitoring (MRM) based quantitative LCMS/MS method was developed. This method allowed for the precise quantification of targeted metabolite biomarkers using an OC blood cohort comprising control samples (n = 464), benign samples (n = 3), and OC samples (n = 13). RESULTS Eleven functional modules were identified as significant differentiators (false discovery rate, FDR < 0.05) between normal and early-stage, or early-stage and late-stage ovarian cancer (OC) tumor tissues. MST analysis revealed that the metabolic L-arginine/nitric oxide (L-ARG/NO) pathway was reprogrammed, and the modules related to "DNA replication" and "DNA repair and recombination" served as anchor modules connecting the other nine modules. Based on this analysis, symmetric dimethylarginine (SDMA) and arginine were proposed as potential liquid biopsy biomarkers for OC assessment. Our quantitative LCMS/MS analysis on our OC blood cohort provided direct evidence supporting the use of the SDMA-to-arginine ratio as a liquid biopsy panel to distinguish between normal and OC samples, with an area under the ROC curve (AUC) of 98.3%. CONCLUSION Our comprehensive analysis of tissue genomics and blood quantitative LC/MSMS metabolic data shed light on the metabolic reprogramming underlying OC pathophysiology. These findings offer new insights into the potential diagnostic utility of the SDMA-to-arginine ratio for OC assessment. Further validation studies using adequately powered OC cohorts are warranted to fully establish the clinical effectiveness of this diagnostic test.
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Affiliation(s)
- Linfeng Chen
- Beijing Shijitan Hospital, Capital Medical University, Beijing, China
| | - Qiming Tang
- Shanghai Yunxiang Medical Technology Co., Ltd., Shanghai, China
- Binhai Industrial Technology Research Institute, Zhejiang University, Tianjin, China
| | - Keying Zhang
- Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing Maternal and Child Health Care Hospital, Beijing, China
| | | | | | - Bo Jin
- Tianjin Yunjian Medical Laboratory Institute Co., Ltd, Tianjin, China
| | - Szumam Liu
- School of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA
| | | | - C James Chou
- School of Medicine, Stanford University, Stanford, CA, USA
| | - Yani Zhang
- Tianjin Yunjian Medical Laboratory Institute Co., Ltd, Tianjin, China
| | | | | | - Zhi Han
- School of Medicine, Stanford University, Stanford, CA, USA
| | | | | | - Zhen Li
- Shanghai Yunxiang Medical Technology Co., Ltd., Shanghai, China
- Binhai Industrial Technology Research Institute, Zhejiang University, Tianjin, China
| | | | - Lu Tian
- School of Medicine, Stanford University, Stanford, CA, USA
| | - Harvey J Cohen
- School of Medicine, Stanford University, Stanford, CA, USA
| | | | - Rebecca C Arent
- School of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Xinyang Zhao
- School of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA
| | | | - Yumei Wu
- Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing Maternal and Child Health Care Hospital, Beijing, China.
| | - Wenpei Bai
- Beijing Shijitan Hospital, Capital Medical University, Beijing, China.
| | - Xuefeng B Ling
- School of Medicine, Stanford University, Stanford, CA, USA.
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6
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Bukłaho PA, Kiśluk J, Nikliński J. Diagnostics and treatment of ovarian cancer in the era of precision medicine - opportunities and challenges. Front Oncol 2023; 13:1227657. [PMID: 37746296 PMCID: PMC10516548 DOI: 10.3389/fonc.2023.1227657] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Accepted: 08/21/2023] [Indexed: 09/26/2023] Open
Abstract
Due to predictions of increasing incidences and deaths from ovarian cancer, this neoplasm is a challenge for modern health care. The advent of NGS technology has made it possible to understand the molecular characteristics of many cancers, including ovarian cancer. The data obtained in research became the basis for the development of molecularly targeted therapies thus leading to the entry of NGS analysis into the diagnostic process of oncological patients. This review presents targeted therapies currently in preclinical or clinical trials, whose promising results offer hope for their use in clinical practice in the future. As more therapeutic options emerge, it will be necessary to modify molecular diagnostic regimens to select the best treatment for a given patient. New biomarkers are needed to predict the success of planned therapy. An important aspect of public health is molecular testing in women with a familial predisposition to ovarian cancer enabling patients to be included in prevention programs. NGS technology, despite its high throughput, poses many challenges, from the quality of the diagnostic material used for testing to the interpretation of results and classification of sequence variants. The article highlights the role of molecular testing in ongoing research and also its role in the diagnostic and therapeutic process in the era of personalized medicine. The spread of genetic testing in high-risk groups, the introduction of more targeted therapies and also the possibility of agnostic therapies could significantly improve the health situation for many women worldwide.
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Affiliation(s)
- Patrycja Aleksandra Bukłaho
- Department of Clinical Molecular Biology, Medical University of Bialystok, Bialystok, Poland
- Doctoral School, Medical University of Bialystok, Bialystok, Poland
| | - Joanna Kiśluk
- Department of Clinical Molecular Biology, Medical University of Bialystok, Bialystok, Poland
| | - Jacek Nikliński
- Department of Clinical Molecular Biology, Medical University of Bialystok, Bialystok, Poland
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7
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Sauriol SA, Carmona E, Udaskin ML, Radulovich N, Leclerc-Desaulniers K, Rottapel R, Oza AM, Lheureux S, Provencher DM, Mes-Masson AM. Inhibition of nicotinamide dinucleotide salvage pathway counters acquired and intrinsic poly(ADP-ribose) polymerase inhibitor resistance in high-grade serous ovarian cancer. Sci Rep 2023; 13:3334. [PMID: 36849518 PMCID: PMC9970983 DOI: 10.1038/s41598-023-30081-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Accepted: 02/15/2023] [Indexed: 03/01/2023] Open
Abstract
Epithelial ovarian cancer is the most lethal gynecological malignancy, owing notably to its high rate of therapy-resistant recurrence in spite of good initial response to chemotherapy. Although poly(ADP-ribose) polymerase inhibitors (PARPi) have shown promise for ovarian cancer treatment, extended therapy usually leads to acquired PARPi resistance. Here we explored a novel therapeutic option to counter this phenomenon, combining PARPi and inhibitors of nicotinamide phosphoribosyltransferase (NAMPT). Cell-based models of acquired PARPi resistance were created through an in vitro selection procedure. Using resistant cells, xenograft tumors were grown in immunodeficient mice, while organoid models were generated from primary patient tumor samples. Intrinsically PARPi-resistant cell lines were also selected for analysis. Our results show that treatment with NAMPT inhibitors effectively sensitized all in vitro models to PARPi. Adding nicotinamide mononucleotide, the resulting NAMPT metabolite, abrogated the therapy-induced cell growth inhibition, demonstrating the specificity of the synergy. Treatment with olaparib (PARPi) and daporinad (NAMPT inhibitor) depleted intracellular NAD+ , induced double-strand DNA breaks, and promoted apoptosis as monitored by caspase-3 cleavage. The two drugs were also synergistic in mouse xenograft models and clinically relevant patient-derived organoids. Therefore, in the context of PARPi resistance, NAMPT inhibition could offer a promising new option for ovarian cancer patients.
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Affiliation(s)
- Skye Alexandre Sauriol
- Centre de Recherche du Centre hospitalier de l'Université de Montréal, Montreal, QC, H2X 0A9, Canada
- Institut du Cancer de Montréal, Montreal, QC, H2X 0A9, Canada
| | - Euridice Carmona
- Centre de Recherche du Centre hospitalier de l'Université de Montréal, Montreal, QC, H2X 0A9, Canada
- Institut du Cancer de Montréal, Montreal, QC, H2X 0A9, Canada
| | - Molly L Udaskin
- Princess Margaret Cancer Centre, University Health Network, Toronto, ON, M5G 1L7, Canada
| | - Nikolina Radulovich
- Princess Margaret Cancer Centre, University Health Network, Toronto, ON, M5G 1L7, Canada
| | - Kim Leclerc-Desaulniers
- Centre de Recherche du Centre hospitalier de l'Université de Montréal, Montreal, QC, H2X 0A9, Canada
- Institut du Cancer de Montréal, Montreal, QC, H2X 0A9, Canada
| | - Robert Rottapel
- Princess Margaret Cancer Centre, University Health Network, Toronto, ON, M5G 1L7, Canada
- Department of Medical Biophysics, University of Toronto, Toronto, ON, M5G 1L7, Canada
| | - Amit M Oza
- Princess Margaret Cancer Centre, University Health Network, Toronto, ON, M5G 1L7, Canada
- Division of Medical Oncology and Hematology, University of Toronto, Toronto, ON, M5G 2M9, Canada
| | - Stephanie Lheureux
- Princess Margaret Cancer Centre, University Health Network, Toronto, ON, M5G 1L7, Canada
- Division of Medical Oncology and Hematology, University of Toronto, Toronto, ON, M5G 2M9, Canada
| | - Diane M Provencher
- Centre de Recherche du Centre hospitalier de l'Université de Montréal, Montreal, QC, H2X 0A9, Canada
- Institut du Cancer de Montréal, Montreal, QC, H2X 0A9, Canada
- Division of Gynecologic Oncology, Université de Montréal, Montreal, QC, H3C 3J7, Canada
| | - Anne-Marie Mes-Masson
- Centre de Recherche du Centre hospitalier de l'Université de Montréal, Montreal, QC, H2X 0A9, Canada.
- Institut du Cancer de Montréal, Montreal, QC, H2X 0A9, Canada.
- Department of Medicine, Université de Montréal, Montreal, QC, H3T 1J4, Canada.
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8
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Sun Y, Shi Y, Liu H, Lv C, Zhang A. The role of poly (ADP-ribose) glycohydrolase in phosphatase and tensin homolog deficiency endometrial cancer. J Obstet Gynaecol Res 2023; 49:1244-1254. [PMID: 36759425 DOI: 10.1111/jog.15563] [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: 10/25/2022] [Accepted: 01/12/2023] [Indexed: 02/11/2023]
Abstract
AIM To explore the relationship between poly(ADP-ribose) glycohydrolase (PARG) and the occurrence, development, and prognosis of endometrial carcinoma (EC), and investigate whether the PARG inhibitor PDD0017273 could increase the sensitivity of EC cells to cisplatin. METHODS The expression of PARG, phosphatase and tensin homolog (PTEN), and p53 in normal endometrial tissues (NE), endometrial hyperplasia without atypia (EH), atypical endometrial hyperplasia (AH), and EC was detected by immunohistochemistry. AN3CA EC cells with PTEN deficiency were treated with different cisplatin and PDD0017273, alone or in combination. Cell proliferation was detected by MTT method, apoptosis was detected by flow cytometry, and the expression of PARG in EC cells after treatment with different drugs was detected by western blot and immunohistochemistry. RESULTS Expression of PARG in NE, EH, AH, and EC increased gradually. In addition, compared with low PARG expression in PTEN-positive EC, patients who had high PARG expression in PTEN-negative EC had more advanced clinical stages (r = -0.399, p = 0.032) and shorter overall survival time (p = 0.037). A dose of 40 μM PDD0017273 effectively inhibited PARG expression, increased the sensitivity of AN3CA cells to cisplatin. CONCLUSIONS The findings suggest that PARG overexpression is a promising immunohistochemical marker to predict the occurrence and prognosis of EC. Moreover, PARG inhibition produced antitumor effects and increased the sensitivity of EC cells with PTEN deficiency to cisplatin.
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Affiliation(s)
- Yanyan Sun
- Department of Gynecology, The Third Central Hospital of Tianjin, Tianjin, China
| | - Yi Shi
- Department of Gynecology, The Third Central Hospital of Tianjin, Tianjin, China
| | - Hui Liu
- Artificial Cell Engineering Technology Research Center, Tianjin, China.,Tianjin Institute of Hepatobiliary Disease, Tianjin, China.,Tianjin Key Laboratory of Extracorporeal Life Support for Critical Diseases, Tianjin, China
| | - Chunmei Lv
- Department of Gynecology, The Third Central Hospital of Tianjin, Tianjin, China
| | - Aihua Zhang
- Department of Gynecology, The Third Central Hospital of Tianjin, Tianjin, China
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9
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The disruption of the CCDC6 – PP4 axis induces a BRCAness like phenotype and sensitivity to PARP inhibitors in high-grade serous ovarian carcinoma. J Exp Clin Cancer Res 2022; 41:245. [PMID: 35964058 PMCID: PMC9375931 DOI: 10.1186/s13046-022-02459-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Accepted: 08/04/2022] [Indexed: 11/10/2022] Open
Abstract
Background Treatment with PARP inhibitors (PARPi) is primarily effective against high-grade serous ovarian cancers (HGSOC) with BRCA1/2 mutations or other deficiencies in homologous recombination (HR) repair mechanisms. However, resistance to PARPi frequently develops, mostly as a result of BRCA1/2 reversion mutations. The tumour suppressor CCDC6 is involved in HR repair by regulating the PP4c phosphatase activity on γH2AX. In this work, we reported that in ovarian cancer cells, a physical or functional loss of CCDC6 results synthetic lethal with the PARP-inhibitors drugs, by affecting the HR repair. We also unravelled a role for CCDC6 as predictive marker of PARPi sensitivity in ovarian cancer, and the impact of CCDC6 downregulation in overcoming PARPi resistance in these tumours. Methods A panel of HGSOC cell lines (either BRCA-wild type or mutant) were treated with PARPi after CCDC6 was attenuated by silencing or by inhibiting USP7, a CCDC6-deubiquitinating enzyme, and the effects on cell survival were assessed. At the cellular and molecular levels, the processes underlying the CCDC6-dependent modification of drugs’ sensitivity were examined. Patient-derived xenografts (PDXs) were immunostained for CCDC6, and the expression of the protein was analysed statistically after digital or visual means. Results HGSOC cells acquired PARPi sensitivity after CCDC6 depletion. Notably, CCDC6 downregulation restored the PARPi sensitivity in newly generated or spontaneously resistant cells containing either wild type- or mutant-BRCA2. When in an un-phosphorylated state, the CCDC6 residue threonine 427 is crucial for effective CCDC6-PP4 complex formation and PP4 sequestration, which maintains high γH2AX levels and effective HR. Remarkably, the PP4-dependent control of HR repair is influenced by the CCDC6 constitutively phosphorylated mutant T427D or by the CCDC6 loss, favouring PARPi sensitivity. As a result, the PP4 regulatory component PP4R3α showed to be essential for both the activity of the PP4 complex and the CCDC6 dependent PARPi sensitivity. It's interesting to note that immunohistochemistry revealed an intense CCDC6 protein staining in olaparib-resistant HGSOC cells and PDXs. Conclusions Our findings suggest that the physical loss or the functional impairment of CCDC6 enhances the PP4c complex activity, which causes BRCAness and PARPi sensitivity in HGSOC cells. Moreover, CCDC6 downregulation might overcome PARPi resistance in HGSOCs, thus supporting the potential of targeting CCDC6 by USP7 inhibitors to tackle PARPi resistance. Supplementary Information The online version contains supplementary material available at 10.1186/s13046-022-02459-2.
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Coulson-Gilmer C, Morgan RD, Nelson L, Barnes BM, Tighe A, Wardenaar R, Spierings DCJ, Schlecht H, Burghel GJ, Foijer F, Desai S, McGrail JC, Taylor SS. Replication catastrophe is responsible for intrinsic PAR glycohydrolase inhibitor-sensitivity in patient-derived ovarian cancer models. J Exp Clin Cancer Res 2021; 40:323. [PMID: 34656146 PMCID: PMC8520217 DOI: 10.1186/s13046-021-02124-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Accepted: 10/02/2021] [Indexed: 01/20/2023] Open
Abstract
BACKGROUND Patients with ovarian cancer often present at advanced stage and, following initial treatment success, develop recurrent drug-resistant disease. PARP inhibitors (PARPi) are yielding unprecedented survival benefits for women with BRCA-deficient disease. However, options remain limited for disease that is platinum-resistant and/or has inherent or acquired PARPi-resistance. PARG, the PAR glycohydrolase that counterbalances PARP activity, is an emerging target with potential to selectively kill tumour cells harbouring oncogene-induced DNA replication and metabolic vulnerabilities. Clinical development of PARG inhibitors (PARGi) will however require predictive biomarkers, in turn requiring an understanding of their mode of action. Furthermore, differential sensitivity to PARPi is key for expanding treatment options available for patients. METHODS A panel of 10 ovarian cancer cell lines and a living biobank of patient-derived ovarian cancer models (OCMs) were screened for PARGi-sensitivity using short- and long-term growth assays. PARGi-sensitivity was characterized using established markers for DNA replication stress, namely replication fibre asymmetry, RPA foci, KAP1 and Chk1 phosphorylation, and pan-nuclear γH2AX, indicating DNA replication catastrophe. Finally, gene expression in sensitive and resistant cells was also examined using NanoString or RNAseq. RESULTS PARGi sensitivity was identified in both ovarian cancer cell lines and patient-derived OCMs, with sensitivity accompanied by markers of persistent replication stress, and a pre-mitotic cell cycle block. Moreover, DNA replication genes are down-regulated in PARGi-sensitive cell lines consistent with an inherent DNA replication vulnerability. However, DNA replication gene expression did not predict PARGi-sensitivity in OCMs. The subset of patient-derived OCMs that are sensitive to single-agent PARG inhibition, includes models that are PARPi- and/or platinum-resistant, indicating that PARG inhibitors may represent an alternative treatment strategy for women with otherwise limited therapeutic options. CONCLUSIONS We discover that a subset of ovarian cancers are intrinsically sensitive to pharmacological PARG blockade, including drug-resistant disease, underpinned by a common mechanism of replication catastrophe. We explore the use of a transcript-based biomarker, and provide insight into the design of future clinical trials of PARGi in patients with ovarian cancer. However, our results highlight the complexity of developing a predictive biomarker for PARGi sensitivity.
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Affiliation(s)
- Camilla Coulson-Gilmer
- Division of Cancer Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester Cancer Research Centre, Oglesby Cancer Research Building, 555 Wilmslow Road, Manchester, M20 4GJ, UK
| | - Robert D Morgan
- Division of Cancer Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester Cancer Research Centre, Oglesby Cancer Research Building, 555 Wilmslow Road, Manchester, M20 4GJ, UK
- Department of Medical Oncology, The Christie NHS Foundation Trust, Wilmslow Rd, Manchester, M20 4BX, UK
| | - Louisa Nelson
- Division of Cancer Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester Cancer Research Centre, Oglesby Cancer Research Building, 555 Wilmslow Road, Manchester, M20 4GJ, UK
| | - Bethany M Barnes
- Division of Cancer Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester Cancer Research Centre, Oglesby Cancer Research Building, 555 Wilmslow Road, Manchester, M20 4GJ, UK
| | - Anthony Tighe
- Division of Cancer Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester Cancer Research Centre, Oglesby Cancer Research Building, 555 Wilmslow Road, Manchester, M20 4GJ, UK
| | - René Wardenaar
- European Research Institute for the Biology of Ageing (ERIBA), University of Groningen, University Medical Center Groningen, Groningen, 9713, AV, The Netherlands
| | - Diana C J Spierings
- European Research Institute for the Biology of Ageing (ERIBA), University of Groningen, University Medical Center Groningen, Groningen, 9713, AV, The Netherlands
| | - Helene Schlecht
- Manchester Centre for Genomic Medicine, St Mary's Hospital, Manchester University NHS Foundation Trust, Oxford Road, Manchester, M13 9WL, UK
| | - George J Burghel
- Manchester Centre for Genomic Medicine, St Mary's Hospital, Manchester University NHS Foundation Trust, Oxford Road, Manchester, M13 9WL, UK
| | - Floris Foijer
- European Research Institute for the Biology of Ageing (ERIBA), University of Groningen, University Medical Center Groningen, Groningen, 9713, AV, The Netherlands
| | - Sudha Desai
- Department of Histopathology, The Christie NHS Foundation Trust, Wilmslow Rd, Manchester, M20 4BX, UK
| | - Joanne C McGrail
- Division of Cancer Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester Cancer Research Centre, Oglesby Cancer Research Building, 555 Wilmslow Road, Manchester, M20 4GJ, UK
| | - Stephen S Taylor
- Division of Cancer Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester Cancer Research Centre, Oglesby Cancer Research Building, 555 Wilmslow Road, Manchester, M20 4GJ, UK.
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Fernandez A, O’Leary C, O’Byrne KJ, Burgess J, Richard DJ, Suraweera A. Epigenetic Mechanisms in DNA Double Strand Break Repair: A Clinical Review. Front Mol Biosci 2021; 8:685440. [PMID: 34307454 PMCID: PMC8292790 DOI: 10.3389/fmolb.2021.685440] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Accepted: 06/24/2021] [Indexed: 12/14/2022] Open
Abstract
Upon the induction of DNA damage, the chromatin structure unwinds to allow access to enzymes to catalyse the repair. The regulation of the winding and unwinding of chromatin occurs via epigenetic modifications, which can alter gene expression without changing the DNA sequence. Epigenetic mechanisms such as histone acetylation and DNA methylation are known to be reversible and have been indicated to play different roles in the repair of DNA. More importantly, the inhibition of such mechanisms has been reported to play a role in the repair of double strand breaks, the most detrimental type of DNA damage. This occurs by manipulating the chromatin structure and the expression of essential proteins that are critical for homologous recombination and non-homologous end joining repair pathways. Inhibitors of histone deacetylases and DNA methyltransferases have demonstrated efficacy in the clinic and represent a promising approach for cancer therapy. The aims of this review are to summarise the role of histone deacetylase and DNA methyltransferase inhibitors involved in DNA double strand break repair and explore their current and future independent use in combination with other DNA repair inhibitors or pre-existing therapies in the clinic.
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Affiliation(s)
- Alejandra Fernandez
- Centre for Genomics and Personalised Health, School of Biomedical Sciences and Translational Research Institute, Queensland University of Technology (QUT), Brisbane, QLD, Australia
| | - Connor O’Leary
- Centre for Genomics and Personalised Health, School of Biomedical Sciences and Translational Research Institute, Queensland University of Technology (QUT), Brisbane, QLD, Australia
- Princess Alexandra Hospital, Woolloongabba, QLD, Australia
| | - Kenneth J O’Byrne
- Centre for Genomics and Personalised Health, School of Biomedical Sciences and Translational Research Institute, Queensland University of Technology (QUT), Brisbane, QLD, Australia
- Princess Alexandra Hospital, Woolloongabba, QLD, Australia
| | - Joshua Burgess
- Centre for Genomics and Personalised Health, School of Biomedical Sciences and Translational Research Institute, Queensland University of Technology (QUT), Brisbane, QLD, Australia
- Princess Alexandra Hospital, Woolloongabba, QLD, Australia
| | - Derek J Richard
- Centre for Genomics and Personalised Health, School of Biomedical Sciences and Translational Research Institute, Queensland University of Technology (QUT), Brisbane, QLD, Australia
- Princess Alexandra Hospital, Woolloongabba, QLD, Australia
| | - Amila Suraweera
- Centre for Genomics and Personalised Health, School of Biomedical Sciences and Translational Research Institute, Queensland University of Technology (QUT), Brisbane, QLD, Australia
- Princess Alexandra Hospital, Woolloongabba, QLD, Australia
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