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Bou Antoun N, Chioni AM. Dysregulated Signalling Pathways Driving Anticancer Drug Resistance. Int J Mol Sci 2023; 24:12222. [PMID: 37569598 PMCID: PMC10418675 DOI: 10.3390/ijms241512222] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Revised: 07/28/2023] [Accepted: 07/28/2023] [Indexed: 08/13/2023] Open
Abstract
One of the leading causes of death worldwide, in both men and women, is cancer. Despite the significant development in therapeutic strategies, the inevitable emergence of drug resistance limits the success and impedes the curative outcome. Intrinsic and acquired resistance are common mechanisms responsible for cancer relapse. Several factors crucially regulate tumourigenesis and resistance, including physical barriers, tumour microenvironment (TME), heterogeneity, genetic and epigenetic alterations, the immune system, tumour burden, growth kinetics and undruggable targets. Moreover, transforming growth factor-beta (TGF-β), Notch, epidermal growth factor receptor (EGFR), integrin-extracellular matrix (ECM), nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB), phosphoinositol-3-kinase/protein kinase B/mammalian target of rapamycin (PI3K/Akt/mTOR), wingless-related integration site (Wnt/β-catenin), Janus kinase/signal transducers and activators of transcription (JAK/STAT) and RAS/RAF/mitogen-activated protein kinase (MAPK) signalling pathways are some of the key players that have a pivotal role in drug resistance mechanisms. To guide future cancer treatments and improve results, a deeper comprehension of drug resistance pathways is necessary. This review covers both intrinsic and acquired resistance and gives a comprehensive overview of recent research on mechanisms that enable cancer cells to bypass barriers put up by treatments, and, like "satellite navigation", find alternative routes by which to carry on their "journey" to cancer progression.
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Affiliation(s)
| | - Athina-Myrto Chioni
- School of Life Sciences Pharmacy and Chemistry, Biomolecular Sciences Department, Kingston University London, Kingston-upon-Thames KT1 2EE, UK;
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2
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Abstract
Cells have evolved a complex network of biochemical pathways, collectively known as the DNA damage response (DDR), to prevent detrimental mutations from being passed on to their progeny. The DDR coordinates DNA repair with cell-cycle checkpoint activation and other global cellular responses. Genes encoding DDR factors are frequently mutated in cancer, causing genomic instability, an intrinsic feature of many tumours that underlies their ability to grow, metastasize and respond to treatments that inflict DNA damage (such as radiotherapy). One instance where we have greater insight into how genetic DDR abrogation impacts on therapy responses is in tumours with mutated BRCA1 or BRCA2. Due to compromised homologous recombination DNA repair, these tumours rely on alternative repair mechanisms and are susceptible to chemical inhibitors of poly(ADP-ribose) polymerase (PARP), which specifically kill homologous recombination-deficient cancer cells, and have become a paradigm for targeted cancer therapy. It is now clear that many other synthetic-lethal relationships exist between DDR genes. Crucially, some of these interactions could be exploited in the clinic to target tumours that become resistant to PARP inhibition. In this Review, we discuss state-of-the-art strategies for DDR inactivation using small-molecule inhibitors and highlight those compounds currently being evaluated in the clinic.
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Affiliation(s)
- Florian J Groelly
- Genome Stability and Tumourigenesis Group, Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Oxford, UK
| | - Matthew Fawkes
- Department of Oncology, MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Oxford, UK
| | - Rebecca A Dagg
- Genome Stability and Tumourigenesis Group, Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Oxford, UK
| | - Andrew N Blackford
- Department of Oncology, MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Oxford, UK.
| | - Madalena Tarsounas
- Genome Stability and Tumourigenesis Group, Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Oxford, UK.
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Wang W, Sun Y, Liu X, Kumar SK, Jin F, Dai Y. Dual-Targeted Therapy Circumvents Non-Genetic Drug Resistance to Targeted Therapy. Front Oncol 2022; 12:859455. [PMID: 35574302 PMCID: PMC9093074 DOI: 10.3389/fonc.2022.859455] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Accepted: 03/14/2022] [Indexed: 02/05/2023] Open
Abstract
The introduction of various targeted agents into the armamentarium of cancer treatment has revolutionized the standard care of patients with cancer. However, like conventional chemotherapy, drug resistance, either preexisting (primary or intrinsic resistance) or developed following treatment (secondary or acquired resistance), remains the Achilles heel of all targeted agents with no exception, via either genetic or non-genetic mechanisms. In the latter, emerging evidence supports the notion that intracellular signaling pathways for tumor cell survival act as a mutually interdependent network via extensive cross-talks and feedback loops. Thus, dysregulations of multiple signaling pathways usually join forces to drive oncogenesis, tumor progression, invasion, metastasis, and drug resistance, thereby providing a basis for so-called “bypass” mechanisms underlying non-genetic resistance in response to targeted agents. In this context, simultaneous interruption of two or more related targets or pathways (an approach called dual-targeted therapy, DTT), via either linear or parallel inhibition, is required to deal with such a form of drug resistance to targeted agents that specifically inhibit a single oncoprotein or oncogenic pathway. Together, while most types of tumor cells are often addicted to two or more targets or pathways or can switch their dependency between them, DTT targeting either intrinsically activated or drug-induced compensatory targets/pathways would efficiently overcome drug resistance caused by non-genetic events, with a great opportunity that those resistant cells might be particularly more vulnerable. In this review article, we discuss, with our experience, diverse mechanisms for non-genetic resistance to targeted agents and the rationales to circumvent them in the treatment of cancer, emphasizing hematologic malignancies.
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Affiliation(s)
- Wei Wang
- Laboratory of Cancer Precision Medicine, The First Hospital of Jilin University, Changchun, China
| | - Yue Sun
- Laboratory of Cancer Precision Medicine, The First Hospital of Jilin University, Changchun, China
| | - Xiaobo Liu
- Laboratory of Cancer Precision Medicine, The First Hospital of Jilin University, Changchun, China
| | - Shaji K Kumar
- Division of Hematology, Mayo Clinic College of Medicine, Rochester, MN, United States
| | - Fengyan Jin
- Department of Hematology, The First Hospital of Jilin University, Changchun, China
| | - Yun Dai
- Laboratory of Cancer Precision Medicine, The First Hospital of Jilin University, Changchun, China
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4
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Hu X, Zhang J, Zhang Y, Jiao F, Wang J, Chen H, Ouyang L, Wang Y. Dual-target inhibitors of poly (ADP-ribose) polymerase-1 for cancer therapy: Advances, challenges, and opportunities. Eur J Med Chem 2022; 230:114094. [PMID: 34998039 DOI: 10.1016/j.ejmech.2021.114094] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Revised: 12/27/2021] [Accepted: 12/27/2021] [Indexed: 02/08/2023]
Abstract
PARP1 plays a crucial role in DNA damage repair, making it an essential target for cancer therapy. PARP1 inhibitors are widely used to treat BRCA-deficient malignancies, and six PARP inhibitors have been approved for clinical use. However, excluding the great clinical success of PARP inhibitors, the concomitant toxicity, drug resistance, and limited scope of application restrict their clinical efficacy. To find solutions to these problems, dual-target inhibitors have shown great potential. In recent years, several studies have linked PAPR1 to other primary cancer targets. Many dual-target inhibitors have been developed using structural fusion, linkage, or library construction methods, overcoming the defects of many single-target inhibitors of PARP1 and achieving great success in clinical cancer therapy. This review summarizes the advance of dual-target PARP1 inhibitors in recent years, focusing on their structural optimization process, structure-activity relationships (SARs), and in vitro or in vivo analysis results.
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Affiliation(s)
- Xinyue Hu
- Targeted Tracer Research and Development Laboratory, Institute of Respiratory Health, Frontiers Science Center for Disease-related Molecular Network, Joint Research Institution of Altitude Health, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, 610041, Sichuan, China; State Key Laboratory of Biotherapy and Cancer Center, Department of Respiratory and Critical Care Medicine, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, 610041, Sichuan, China; College of Life Sciences, Sichuan University, Chengdu, 610064, China
| | - Jifa Zhang
- Targeted Tracer Research and Development Laboratory, Institute of Respiratory Health, Frontiers Science Center for Disease-related Molecular Network, Joint Research Institution of Altitude Health, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, 610041, Sichuan, China; State Key Laboratory of Biotherapy and Cancer Center, Department of Respiratory and Critical Care Medicine, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, 610041, Sichuan, China; Precision Medicine Key Laboratory of Sichuan Province & Precision Medicine Research Center, West China Hospital, Sichuan University, Chengdu, 610041, Sichuan, China
| | - Ya Zhang
- Targeted Tracer Research and Development Laboratory, Institute of Respiratory Health, Frontiers Science Center for Disease-related Molecular Network, Joint Research Institution of Altitude Health, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, 610041, Sichuan, China; College of Life Sciences, Sichuan University, Chengdu, 610064, China
| | - Fulun Jiao
- Targeted Tracer Research and Development Laboratory, Institute of Respiratory Health, Frontiers Science Center for Disease-related Molecular Network, Joint Research Institution of Altitude Health, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, 610041, Sichuan, China; College of Life Sciences, Sichuan University, Chengdu, 610064, China
| | - Jiaxing Wang
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Tennessee Health Science Center, Memphis, 38163, Tennessee, United States
| | - Hao Chen
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Tennessee Health Science Center, Memphis, 38163, Tennessee, United States
| | - Liang Ouyang
- Targeted Tracer Research and Development Laboratory, Institute of Respiratory Health, Frontiers Science Center for Disease-related Molecular Network, Joint Research Institution of Altitude Health, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, 610041, Sichuan, China; State Key Laboratory of Biotherapy and Cancer Center, Department of Respiratory and Critical Care Medicine, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, 610041, Sichuan, China; Precision Medicine Key Laboratory of Sichuan Province & Precision Medicine Research Center, West China Hospital, Sichuan University, Chengdu, 610041, Sichuan, China
| | - Yuxi Wang
- Targeted Tracer Research and Development Laboratory, Institute of Respiratory Health, Frontiers Science Center for Disease-related Molecular Network, Joint Research Institution of Altitude Health, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, 610041, Sichuan, China; State Key Laboratory of Biotherapy and Cancer Center, Department of Respiratory and Critical Care Medicine, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, 610041, Sichuan, China; Precision Medicine Key Laboratory of Sichuan Province & Precision Medicine Research Center, West China Hospital, Sichuan University, Chengdu, 610041, Sichuan, China.
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Guo N, Li MZ, Wang LM, Chen HD, Song SS, Miao ZH, He JX. Repeated treatments of Capan-1 cells with PARP1 and Chk1 inhibitors promote drug resistance, migration and invasion. Cancer Biol Ther 2022; 23:69-82. [PMID: 35000525 PMCID: PMC8812781 DOI: 10.1080/15384047.2021.2024414] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
PARP1 and Chk1 inhibitors have been shown to be synergistic in different cancer models in relatively short time treatment modes. However, the consequences of long-term/repeated treatments with the combinations in cancer models remain unclear. In this study, the synergistic cytotoxicity of their combinations in 8 tumor cell lines was confirmed in a 7-day exposure mode. Then, pancreatic Capan-1 cells were repeatedly treated with the PARP1 inhibitor olaparib, the Chk1 inhibitor rabusertib or their combination for 211–214 days, during which the changes in drug sensitivity were monitored at a 35-day interval. Unexpectedly, among the 3 treatment modes, the combination treatments resulted in the highest-grade resistance to Chk1 (~14.6 fold) and PARP1 (~420.2 fold) inhibitors, respectively. Consistently, G2/M arrest and apoptosis decreased significantly in the resulting resistant variants exposed to olaparib. All 3 resistant variants also unexpectedly obtained enhanced migratory and invasive capabilities. Moreover, the combination treatments resulted in increased migration and invasion than olaparib alone. The expression of 124 genes changed significantly in all the resistant variants. We further demonstrate that activating CXCL3-ERK1/2 signaling might contribute to the enhanced migratory capabilities rather than the acquired drug resistance. Our findings indicate that repeated treatments with the rabusertib/olaparib combination result in increased drug resistance and a more aggressive cell phenotype than those with either single agent, providing new clues for future clinical anticancer tests of PARP1 and Chk1 inhibitor combinations.
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Affiliation(s)
- Ne Guo
- Division of Anti-Tumor Pharmacology, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Meng-Zhu Li
- Division of Anti-Tumor Pharmacology, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Li-Min Wang
- Division of Anti-Tumor Pharmacology, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Hua-Dong Chen
- Division of Anti-Tumor Pharmacology, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Shan-Shan Song
- Division of Anti-Tumor Pharmacology, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China
| | - Ze-Hong Miao
- Division of Anti-Tumor Pharmacology, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Jin-Xue He
- Division of Anti-Tumor Pharmacology, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China.,University of Chinese Academy of Sciences, Beijing, China
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6
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Rominiyi O, Collis SJ. DDRugging glioblastoma: understanding and targeting the DNA damage response to improve future therapies. Mol Oncol 2022; 16:11-41. [PMID: 34036721 PMCID: PMC8732357 DOI: 10.1002/1878-0261.13020] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 05/11/2021] [Accepted: 05/24/2021] [Indexed: 12/13/2022] Open
Abstract
Glioblastoma is the most frequently diagnosed type of primary brain tumour in adults. These aggressive tumours are characterised by inherent treatment resistance and disease progression, contributing to ~ 190 000 brain tumour-related deaths globally each year. Current therapeutic interventions consist of surgical resection followed by radiotherapy and temozolomide chemotherapy, but average survival is typically around 1 year, with < 10% of patients surviving more than 5 years. Recently, a fourth treatment modality of intermediate-frequency low-intensity electric fields [called tumour-treating fields (TTFields)] was clinically approved for glioblastoma in some countries after it was found to increase median overall survival rates by ~ 5 months in a phase III randomised clinical trial. However, beyond these treatments, attempts to establish more effective therapies have yielded little improvement in survival for patients over the last 50 years. This is in contrast to many other types of cancer and highlights glioblastoma as a recognised tumour of unmet clinical need. Previous work has revealed that glioblastomas contain stem cell-like subpopulations that exhibit heightened expression of DNA damage response (DDR) factors, contributing to therapy resistance and disease relapse. Given that radiotherapy, chemotherapy and TTFields-based therapies all impact DDR mechanisms, this Review will focus on our current knowledge of the role of the DDR in glioblastoma biology and treatment. We also discuss the potential of effective multimodal targeting of the DDR combined with standard-of-care therapies, as well as emerging therapeutic targets, in providing much-needed improvements in survival rates for patients.
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Affiliation(s)
- Ola Rominiyi
- Weston Park Cancer CentreSheffieldUK
- Department of Oncology & MetabolismThe University of Sheffield Medical SchoolUK
- Department of NeurosurgeryRoyal Hallamshire HospitalSheffield Teaching Hospitals NHS Foundation TrustUK
| | - Spencer J. Collis
- Weston Park Cancer CentreSheffieldUK
- Department of Oncology & MetabolismThe University of Sheffield Medical SchoolUK
- Sheffield Institute for Nucleic Acids (SInFoNiA)University of SheffieldUK
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7
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Chen YX, Tan LM, Gong JP, Huang MS, Yin JY, Zhang W, Zhou HH, Liu ZQ. Response prediction biomarkers and drug combinations of PARP inhibitors in prostate cancer. Acta Pharmacol Sin 2021; 42:1970-1980. [PMID: 33589795 PMCID: PMC8632930 DOI: 10.1038/s41401-020-00604-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Accepted: 12/20/2020] [Indexed: 01/31/2023] Open
Abstract
PARP inhibitors are a group of inhibitors targeting poly(ADP-ribose) polymerases (PARP1 or PARP2) involved in DNA repair and transcriptional regulation, which may induce synthetic lethality in BRCAness tumors. Systematic analyzes of genomic sequencing in prostate cancer show that ~10%-19% of patients with primary prostate cancer have inactivated DNA repair genes, with a notably higher proportion of 23%-27% in patients with metastatic castration-resistant prostate cancer (mCRPC). These characteristic genomic alterations confer possible vulnerability to PARP inhibitors in patients with mCRPC who benefit only modestly from other therapies. However, only a small proportion of patients with mCRPC shows sensitivity to PARP inhibitors, and these sensitive patients cannot be fully identified by existing response prediction biomarkers. In this review, we provide an overview of the potential response prediction biomarkers and synergistic combinations studied in the preclinical and clinical stages, which may expand the population of patients with prostate cancer who may benefit from PARP inhibitors.
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Affiliation(s)
- Yi-Xin Chen
- Department of Clinical Pharmacology, Hunan Key Laboratory of Pharmacogenetics, and National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, 410008, China
- Institute of Clinical Pharmacology, Engineering Research Center for Applied Technology of Pharmacogenomics of Ministry of Education, Central South University, Changsha, 410078, China
| | - Li-Ming Tan
- Department of Pharmacy, The Second People's Hospital of Huaihua City, Huaihua, 418000, China
| | - Jian-Ping Gong
- Department of Pharmacy, The Second People's Hospital of Huaihua City, Huaihua, 418000, China
| | - Ma-Sha Huang
- Department of Clinical Pharmacology, Hunan Key Laboratory of Pharmacogenetics, and National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, 410008, China
- Institute of Clinical Pharmacology, Engineering Research Center for Applied Technology of Pharmacogenomics of Ministry of Education, Central South University, Changsha, 410078, China
| | - Ji-Ye Yin
- Department of Clinical Pharmacology, Hunan Key Laboratory of Pharmacogenetics, and National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, 410008, China
- Institute of Clinical Pharmacology, Engineering Research Center for Applied Technology of Pharmacogenomics of Ministry of Education, Central South University, Changsha, 410078, China
| | - Wei Zhang
- Department of Clinical Pharmacology, Hunan Key Laboratory of Pharmacogenetics, and National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, 410008, China
- Institute of Clinical Pharmacology, Engineering Research Center for Applied Technology of Pharmacogenomics of Ministry of Education, Central South University, Changsha, 410078, China
| | - Hong-Hao Zhou
- Department of Clinical Pharmacology, Hunan Key Laboratory of Pharmacogenetics, and National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, 410008, China
- Institute of Clinical Pharmacology, Engineering Research Center for Applied Technology of Pharmacogenomics of Ministry of Education, Central South University, Changsha, 410078, China
| | - Zhao-Qian Liu
- Department of Clinical Pharmacology, Hunan Key Laboratory of Pharmacogenetics, and National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, 410008, China.
- Institute of Clinical Pharmacology, Engineering Research Center for Applied Technology of Pharmacogenomics of Ministry of Education, Central South University, Changsha, 410078, China.
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Nathansen J, Meyer F, Müller L, Schmitz M, Borgmann K, Dubrovska A. Beyond the Double-Strand Breaks: The Role of DNA Repair Proteins in Cancer Stem-Cell Regulation. Cancers (Basel) 2021; 13:4818. [PMID: 34638302 DOI: 10.3390/cancers13194818] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 09/22/2021] [Accepted: 09/22/2021] [Indexed: 12/12/2022] Open
Abstract
Simple Summary Cancer stem cells (CSCs) are a tumor cell population maintaining tumor growth and promoting tumor relapse if not wholly eradicated during treatment. CSCs are often equipped with molecular mechanisms making them resistant to conventional anti-cancer therapies whose curative potential depends on DNA damage-induced cell death. An elevated expression of some key DNA repair proteins is one of such defense mechanisms. However, new research reveals that the role of critical DNA repair proteins is extending far beyond the DNA repair mechanisms. This review discusses the diverse biological functions of DNA repair proteins in CSC maintenance and the adaptation to replication and oxidative stress, anti-cancer immune response, epigenetic reprogramming, and intracellular signaling mechanisms. It also provides an overview of their potential therapeutic targeting. Abstract Cancer stem cells (CSCs) are pluripotent and highly tumorigenic cells that can re-populate a tumor and cause relapses even after initially successful therapy. As with tissue stem cells, CSCs possess enhanced DNA repair mechanisms. An active DNA damage response alleviates the increased oxidative and replicative stress and leads to therapy resistance. On the other hand, mutations in DNA repair genes cause genomic instability, therefore driving tumor evolution and developing highly aggressive CSC phenotypes. However, the role of DNA repair proteins in CSCs extends beyond the level of DNA damage. In recent years, more and more studies have reported the unexpected role of DNA repair proteins in the regulation of transcription, CSC signaling pathways, intracellular levels of reactive oxygen species (ROS), and epithelial–mesenchymal transition (EMT). Moreover, DNA damage signaling plays an essential role in the immune response towards tumor cells. Due to its high importance for the CSC phenotype and treatment resistance, the DNA damage response is a promising target for individualized therapies. Furthermore, understanding the dependence of CSC on DNA repair pathways can be therapeutically exploited to induce synthetic lethality and sensitize CSCs to anti-cancer therapies. This review discusses the different roles of DNA repair proteins in CSC maintenance and their potential as therapeutic targets.
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Neiger HE, Siegler EL, Shi Y. Breast Cancer Predisposition Genes and Synthetic Lethality. Int J Mol Sci 2021; 22:5614. [PMID: 34070674 DOI: 10.3390/ijms22115614] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 05/20/2021] [Accepted: 05/24/2021] [Indexed: 12/13/2022] Open
Abstract
BRCA1 and BRCA2 are tumor suppressor genes with pivotal roles in the development of breast and ovarian cancers. These genes are essential for DNA double-strand break repair via homologous recombination (HR), which is a virtually error-free DNA repair mechanism. Following BRCA1 or BRCA2 mutations, HR is compromised, forcing cells to adopt alternative error-prone repair pathways that often result in tumorigenesis. Synthetic lethality refers to cell death caused by simultaneous perturbations of two genes while change of any one of them alone is nonlethal. Therefore, synthetic lethality can be instrumental in identifying new therapeutic targets for BRCA1/2 mutations. PARP is an established synthetic lethal partner of the BRCA genes. Its role is imperative in the single-strand break DNA repair system. Recently, Olaparib (a PARP inhibitor) was approved for treatment of BRCA1/2 breast and ovarian cancer as the first successful synthetic lethality-based therapy, showing considerable success in the development of effective targeted cancer therapeutics. Nevertheless, the possibility of drug resistance to targeted cancer therapy based on synthetic lethality necessitates the development of additional therapeutic options. This literature review addresses cancer predisposition genes, including BRCA1, BRCA2, and PALB2, synthetic lethality in the context of DNA repair machinery, as well as available treatment options.
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Calzetta NL, González Besteiro MA, Gottifredi V. PARP Activity Fine-tunes the DNA Replication Choreography of Chk1-depleted Cells. J Mol Biol 2021; 433:166949. [PMID: 33744317 DOI: 10.1016/j.jmb.2021.166949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Revised: 02/18/2021] [Accepted: 03/11/2021] [Indexed: 10/21/2022]
Abstract
Checkpoint Kinase 1 (Chk1) prevents DNA damage by adjusting the replication choreography in the face of replication stress. Chk1 depletion provokes slow and asymmetrical fork movement, yet the signals governing such changes remain unclear. We sought to investigate whether poly(ADP-ribose) polymerases (PARPs), key players of the DNA damage response, intervene in the DNA replication of Chk1-depleted cells. We demonstrate that PARP inhibition selectively alleviates the reduced fork elongation rates, without relieving fork asymmetry in Chk1-depleted cells. While the contribution of PARPs to fork elongation is not unprecedented, we found that their role in Chk1-depleted cells extends beyond fork movement. PARP-dependent fork deceleration induced mild dormant origin firing upon Chk1 depletion, augmenting the global rates of DNA synthesis. Thus, we have identified PARPs as novel regulators of replication fork dynamics in Chk1-depleted cells.
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Affiliation(s)
- Nicolás Luis Calzetta
- Fundación Instituto Leloir - Instituto de Investigaciones Bioquímicas de Buenos Aires, Consejo de Investigaciones Científicas y Técnicas, Avenida Patricias Argentinas 435, C1405BWE Buenos Aires, Argentina
| | - Marina Alejandra González Besteiro
- Fundación Instituto Leloir - Instituto de Investigaciones Bioquímicas de Buenos Aires, Consejo de Investigaciones Científicas y Técnicas, Avenida Patricias Argentinas 435, C1405BWE Buenos Aires, Argentina.
| | - Vanesa Gottifredi
- Fundación Instituto Leloir - Instituto de Investigaciones Bioquímicas de Buenos Aires, Consejo de Investigaciones Científicas y Técnicas, Avenida Patricias Argentinas 435, C1405BWE Buenos Aires, Argentina.
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11
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Nair J, Huang TT, Murai J, Haynes B, Steeg PS, Pommier Y, Lee JM. Resistance to the CHK1 inhibitor prexasertib involves functionally distinct CHK1 activities in BRCA wild-type ovarian cancer. Oncogene 2020; 39:5520-5535. [PMID: 32647134 PMCID: PMC7426265 DOI: 10.1038/s41388-020-1383-4] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Revised: 06/15/2020] [Accepted: 06/25/2020] [Indexed: 12/16/2022]
Abstract
High grade serous ovarian cancer (HGSOC) is a fatal gynecologic malignancy in the U.S. with limited treatment options. New therapeutic strategies include targeting of the cell cycle checkpoints, e.g., ATR and CHK1. We recently reported a promising clinical activity of the CHK1 inhibitor (CHK1i) prexasertib monotherapy in BRCA wild-type (BRCAwt) HGSOC patients. In this study, biopsies of treated patients and cell line models were used to investigate possible mechanisms of resistance to CHK1i. We report that BRCAwt HGSOC develops resistance to prexasertib monotherapy via a prolonged G2 delay induced by lower CDK1/CyclinB1 activity, thus preventing cells from mitotic catastrophe and cell death. On the other hand, we noted CHK1's regulation on RAD51-mediated homologous recombination (HR) repair was not altered in CHK1i-resistant cells. Therefore, CHK1i sensitizes CHK1i-resistant cells to DNA damaging agents such as gemcitabine or hydroxyurea by inhibition of HR. In summary, our results demonstrate new mechanistic insights of functionally distinct CHK1 activities and highlight a potential combination treatment approach to overcome CHK1i resistance in BRCAwt HGSOC.
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Affiliation(s)
- Jayakumar Nair
- Women's Malignancies Branch, National Institutes of Health, Bethesda, 20892, MD, USA.
| | - Tzu-Ting Huang
- Women's Malignancies Branch, National Institutes of Health, Bethesda, 20892, MD, USA
| | - Junko Murai
- Developmental Therapeutics Branch and Laboratory of Molecular Pharmacology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, 20892, MD, USA
| | - Brittany Haynes
- Women's Malignancies Branch, National Institutes of Health, Bethesda, 20892, MD, USA
| | - Patricia S Steeg
- Women's Malignancies Branch, National Institutes of Health, Bethesda, 20892, MD, USA
| | - Yves Pommier
- Developmental Therapeutics Branch and Laboratory of Molecular Pharmacology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, 20892, MD, USA
| | - Jung-Min Lee
- Women's Malignancies Branch, National Institutes of Health, Bethesda, 20892, MD, USA
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12
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Abstract
DNA damage response (DDR) pathway prevents high level endogenous and environmental DNA damage being replicated and passed on to the next generation of cells via an orchestrated and integrated network of cell cycle checkpoint signalling and DNA repair pathways. Depending on the type of damage, and where in the cell cycle it occurs different pathways are involved, with the ATM-CHK2-p53 pathway controlling the G1 checkpoint or ATR-CHK1-Wee1 pathway controlling the S and G2/M checkpoints. Loss of G1 checkpoint control is common in cancer through TP53, ATM mutations, Rb loss or cyclin E overexpression, providing a stronger rationale for targeting the S/G2 checkpoints. This review will focus on the ATM-CHK2-p53-p21 pathway and the ATR-CHK1-WEE1 pathway and ongoing efforts to target these pathways for patient benefit.
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13
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Smith HL, Prendergast L, Curtin NJ. Exploring the Synergy between PARP and CHK1 Inhibition in Matched BRCA2 Mutant and Corrected Cells. Cancers (Basel) 2020; 12:E878. [PMID: 32260355 DOI: 10.3390/cancers12040878] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Revised: 03/20/2020] [Accepted: 03/31/2020] [Indexed: 02/01/2023] Open
Abstract
PARP inhibition results in the accumulation of DNA SSBs, causing replication stress (RS) and lesions that can only be resolved by homologous recombination repair (HRR). Defects in HRR, e.g., due to BRCA2 mutation, confer profound sensitivity to PARP inhibitor (PARPi) cytotoxicity. In response to RS, CHK1 is activated to signal to S and G2/M cell cycle checkpoints and also to HRR. To determine the relative contribution of these two functions of CHK1 to survival following PARPi exposure, we investigated the effects of rucaparib (a PARPi) and PF-477736 (a CHK1 inhibitor) alone and in combination in cells with mutated and corrected BRCA2. The BRCA2 mutated V-C8 cells were 1000× more sensitive to rucaparib cytotoxicity than their matched BRCA2 corrected V-C8.B2 cells, but no more sensitive to PF-477736 despite having seven-fold higher levels of RS. PF-477736 caused a five-fold enhancement of rucaparib cytotoxicity in the V-C8.B2 cells, but no enhancement in the V-C8 cells. This differential sensitivity was not due to a difference in PARP1 or CHK1 expression or activity. PF-477736 increased rucaparib-induced RS (γH2AX foci) and completely inhibited RAD51 focus formation, indicating a profound suppression of HRR. Our data suggested that inhibition of HRR was the main mechanism of sensitisation to rucaparib, compounded with an inhibition of cell cycle checkpoints by PF-477736.
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14
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Abstract
Introduction: Checkpoint kinase 1 (CHK1) inhibitors have been in development for two decades. The initial CHK1 inhibitor staurosporine analog, UCN01, entered clinical trials whilst it was still considered to act via PKC inhibition; only later were trials performed in a more focused fashion to determine whether CHK1 inhibition could dysregulate cell cycle checkpoints. Many of the subsequently synthesized more specific CHK1 inhibitors have failed because of poor PK/PD or cumulative normal tissue toxicities in patients. CHK1 inhibitor monotherapy often demonstrates limited efficacy and in general, must be combined with other agents. The combination of CHK1 inhibitors with modern signaling regulators may be a better therapeutic strategy.Areas covered: This review discusses the history of, and translational use of CHK1 inhibitors; the latest generation of CHK1 inhibitors to enter clinic development are also examined.Expert opinion: Some CHK1 inhibitors can be administered safely, but that when they are combined with traditional cytotoxic DNA damaging agents, the normal tissue toxicities outweigh the very modest gains in therapeutic efficacy. Researchers need to think outside of the box and consider how CHK1 inhibitors can be combined with other signal transduction modulators such as MEK1/2 and PARP1 inhibitors to kill tumor cells.
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Affiliation(s)
- Paul Dent
- Department of Biochemistry and Molecular Biology, Virginia Commonwealth University, Richmond, VA, USA
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15
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Abstract
Mitosis ensures accurate segregation of duplicated DNA through tight regulation of chromosome condensation, bipolar spindle assembly, chromosome alignment in the metaphase plate, chromosome segregation and cytokinesis. Poly(ADP-ribose) polymerases (PARPs), in particular PARP1, PARP2, PARP3, PARP5a (TNKS1), as well as poly(ADP-ribose) glycohydrolase (PARG), regulate different mitotic functions, including centrosome function, mitotic spindle assembly, mitotic checkpoints, telomere length and telomere cohesion. PARP depletion or inhibition give rise to various mitotic defects such as centrosome amplification, multipolar spindles, chromosome misalignment, premature loss of cohesion, metaphase arrest, anaphase DNA bridges, lagging chromosomes, and micronuclei. As the mechanisms of PARP1/2 inhibitor-mediated cell death are being progressively elucidated, it is becoming clear that mitotic defects caused by PARP1/2 inhibition arise due to replication stress and DNA damage in S phase. As it stands, entrapment of inactive PARP1/2 on DNA phenocopies replication stress through accumulation of unresolved replication intermediates, double-stranded DNA breaks (DSBs) and incorrectly repaired DSBs, which can be transmitted from S phase to mitosis and instigate various mitotic defects, giving rise to both numerical and structural chromosomal aberrations. Cancer cells have increased levels of replication stress, which makes them particularly susceptible to a combination of agents that compromise replication fork stability. Indeed, combining PARP1/2 inhibitors with genetic deficiencies in DNA repair pathways, DNA-damaging agents, ATR and other cell cycle checkpoint inhibitors has yielded synergistic effects in killing cancer cells. Here I provide a comprehensive overview of the mitotic functions of PARPs and PARG, mitotic phenotypes induced by their depletion or inhibition, as well as the therapeutic relevance of targeting mitotic cells by directly interfering with mitotic functions or indirectly through replication stress.
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Affiliation(s)
- Dea Slade
- Department of Biochemistry, Max F. Perutz Laboratories, University of Vienna, Vienna Biocenter (VBC), Dr. Bohr-gasse 9, 1030 Vienna, Austria.
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16
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Labrie M, Kim TB, Ju Z, Lee S, Zhao W, Fang Y, Lu Y, Chen K, Ramirez P, Frumovitz M, Meyer L, Fleming ND, Sood AK, Coleman RL, Mills GB, Westin SN. Adaptive responses in a PARP inhibitor window of opportunity trial illustrate limited functional interlesional heterogeneity and potential combination therapy options. Oncotarget 2019; 10:3533-3546. [PMID: 31191824 PMCID: PMC6544405 DOI: 10.18632/oncotarget.26947] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Accepted: 05/02/2019] [Indexed: 12/17/2022] Open
Abstract
Poly (ADP-ribose) polymerase inhibitor (PARPi)-based combination therapies are demonstrating efficacy in patients, however, identifying the right combination for the right patient remains a critical challenge. Thus, it is urgent to develop approaches able to identify patients likely to benefit from specific combination therapies. Several groups, including ours, have demonstrated that targeting adaptive responses induced by PARPi increases depth and duration of response. In this study, we instituted a talazoparib (PARPi) monotherapy window of opportunity trial to identify informative adaptive responses in high grade serous ovarian cancer patients (HGSOC). Patients were treated for 7 to 14 days with PARPi monotherapy prior to surgery with tissue samples from multiple sites being collected pre- and post-treatment in each patient. Analysis of these samples demonstrated that individual patients displayed different adaptive responses with limited interlesional heterogeneity. Ability of combination therapies designed to interdict adaptive responses to decrease viability was validated using model systems. Thus, assessment of adaptive responses to PARPi provides an opportunity for patient-specific selection of combination therapies designed to interdict patient-specific adaptive responses to maximize patient benefit.
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Affiliation(s)
- Marilyne Labrie
- Knight Cancer Institute and Cell, Developmental and Cancer Biology, Oregon Health and Science University, Portland, OR, USA
| | - Tae-Beom Kim
- Department of Bioinformatics and Computational Biology, University of Texas, MD Anderson Cancer Center, Houston, TX, USA
| | - Zhenlin Ju
- Department of Bioinformatics and Computational Biology, University of Texas, MD Anderson Cancer Center, Houston, TX, USA
| | - Sanghoon Lee
- Department of Systems Biology, University of Texas, MD Anderson Cancer Center, Houston, TX, USA
| | - Wei Zhao
- Department of Systems Biology, University of Texas, MD Anderson Cancer Center, Houston, TX, USA
| | - Yong Fang
- Knight Cancer Institute and Cell, Developmental and Cancer Biology, Oregon Health and Science University, Portland, OR, USA
| | - Yiling Lu
- Department of Systems Biology, University of Texas, MD Anderson Cancer Center, Houston, TX, USA
| | - Ken Chen
- Department of Bioinformatics and Computational Biology, University of Texas, MD Anderson Cancer Center, Houston, TX, USA
| | - Pedro Ramirez
- Department of Gynecologic Oncology and Reproductive Medicine, University of Texas, MD Anderson Cancer Center, Houston, TX, USA
| | - Michael Frumovitz
- Department of Gynecologic Oncology and Reproductive Medicine, University of Texas, MD Anderson Cancer Center, Houston, TX, USA
| | - Larissa Meyer
- Department of Gynecologic Oncology and Reproductive Medicine, University of Texas, MD Anderson Cancer Center, Houston, TX, USA
| | - Nicole D Fleming
- Department of Gynecologic Oncology and Reproductive Medicine, University of Texas, MD Anderson Cancer Center, Houston, TX, USA
| | - Anil K Sood
- Department of Gynecologic Oncology and Reproductive Medicine, University of Texas, MD Anderson Cancer Center, Houston, TX, USA
| | - Robert L Coleman
- Department of Gynecologic Oncology and Reproductive Medicine, University of Texas, MD Anderson Cancer Center, Houston, TX, USA
| | - Gordon B Mills
- Knight Cancer Institute and Cell, Developmental and Cancer Biology, Oregon Health and Science University, Portland, OR, USA.,Department of Systems Biology, University of Texas, MD Anderson Cancer Center, Houston, TX, USA
| | - Shannon N Westin
- Department of Gynecologic Oncology and Reproductive Medicine, University of Texas, MD Anderson Cancer Center, Houston, TX, USA
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17
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Shao N, Shi Y, Yu L, Ye R, Shan Z, Zhang Z, Zhang Y, Lin Y. Prospect for Application of PARP Inhibitor in Patients with HER2 Negative Breast Cancer. Int J Biol Sci 2019; 15:962-972. [PMID: 31182917 PMCID: PMC6535782 DOI: 10.7150/ijbs.30721] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2018] [Accepted: 12/13/2018] [Indexed: 12/25/2022] Open
Abstract
Human epidermal growth factor receptor (HER2) negative metastatic breast cancer (BC) accounts for 73% of BC. The molecular analysis of this disease is essential for potential options for targeted therapy. Several promising clinical strategies are being evaluated which includes endocrine therapy, modified chemotherapy, angiogenesis inhibitors, immune checkpoint inhibitors, and anti-androgens. New therapeutic approaches are being developed that target BC patients with germline mutations in either BRCA1, BRCA2 as well as BRCAness, a condition in which tumors have molecular similarity to BRCA-mutated tumors. Poly (ADP-ribose) polymerase inhibitors (PARPi) which are effective therapy in germline BRCA1 and BRCA2 mutations, are also observed to be effective in somatic mutations. Germline mutations in the homologous recombination pathway genes could also contribute to PARPi sensitivity. PARPi act as chemo- and radio-sensitizers by limiting the DNA-damage response and potentiating the activity of chemo- and radio-therapy when used alone or in combination with chemotherapy. Apart from PARPi as monotherapy, additional researches are ongoing in combination with cytotoxic chemotherapeutics and targeted agents in HER2 negative BC. This review aims at the most recent developments in the targeted therapy, summarizes the recent clinical trials outcomes, along with the overview of ongoing clinical trials in HER2 negative patients with BRCA1/2 mutations and sporadic tumors with BRCAness.
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Affiliation(s)
| | | | | | | | | | | | | | - Ying Lin
- Breast Disease Center, The First Affiliated Hospital, Sun Yat-Sen University, No. 58, ZhongShan Er Lu, Guangzhou, Guangdong, 510080, P.R. China
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18
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Lowery CD, Dowless M, Renschler M, Blosser W, VanWye AB, Stephens JR, Iversen PW, Lin AB, Beckmann RP, Krytska K, Cole KA, Maris JM, Hawkins DS, Rubin BP, Kurmasheva RT, Houghton PJ, Gorlick R, Kolb EA, Kang MH, Reynolds CP, Erickson SW, Teicher BA, Smith MA, Stancato LF. Broad Spectrum Activity of the Checkpoint Kinase 1 Inhibitor Prexasertib as a Single Agent or Chemopotentiator Across a Range of Preclinical Pediatric Tumor Models. Clin Cancer Res 2018; 25:2278-2289. [PMID: 30563935 DOI: 10.1158/1078-0432.ccr-18-2728] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2018] [Revised: 11/13/2018] [Accepted: 12/14/2018] [Indexed: 12/21/2022]
Abstract
PURPOSE Checkpoint kinase 1 (CHK1) inhibitors potentiate the DNA-damaging effects of cytotoxic therapies and/or promote elevated levels of replication stress, leading to tumor cell death. Prexasertib (LY2606368) is a CHK1 small-molecule inhibitor under clinical evaluation in multiple adult and pediatric cancers. In this study, prexasertib was tested in a large panel of preclinical models of pediatric solid malignancies alone or in combination with chemotherapy. EXPERIMENTAL DESIGN DNA damage and changes in cell signaling following in vitro prexasertib treatment in pediatric sarcoma cell lines were analyzed by Western blot and high content imaging. Antitumor activity of prexasertib as a single agent or in combination with different chemotherapies was explored in cell line-derived (CDX) and patient-derived xenograft (PDX) mouse models representing nine different pediatric cancer histologies. RESULTS Pediatric sarcoma cell lines were highly sensitive to prexasertib treatment in vitro, resulting in activation of the DNA damage response. Two PDX models of desmoplastic small round cell tumor and one malignant rhabdoid tumor CDX model responded to prexasertib with complete regression. Prexasertib monotherapy also elicited robust responses in mouse models of rhabdomyosarcoma. Concurrent administration with chemotherapy was sufficient to overcome innate resistance or prevent acquired resistance to prexasertib in preclinical models of neuroblastoma, osteosarcoma, and Ewing sarcoma, or alveolar rhabdomyosarcoma, respectively. CONCLUSIONS Prexasertib has significant antitumor effects as a monotherapy or in combination with chemotherapy in multiple preclinical models of pediatric cancer. These findings support further investigation of prexasertib in pediatric malignancies.
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Affiliation(s)
- Caitlin D Lowery
- Eli Lilly and Company, Lilly Corporate Center, Indianapolis, Indiana
| | - Michele Dowless
- Eli Lilly and Company, Lilly Corporate Center, Indianapolis, Indiana
| | - Matthew Renschler
- Eli Lilly and Company, Lilly Corporate Center, Indianapolis, Indiana
| | - Wayne Blosser
- Eli Lilly and Company, Lilly Corporate Center, Indianapolis, Indiana
| | - Alle B VanWye
- Eli Lilly and Company, Lilly Corporate Center, Indianapolis, Indiana
| | | | - Philip W Iversen
- Eli Lilly and Company, Lilly Corporate Center, Indianapolis, Indiana
| | - Aimee Bence Lin
- Eli Lilly and Company, Lilly Corporate Center, Indianapolis, Indiana
| | | | - Kateryna Krytska
- The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
| | - Kristina A Cole
- The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
| | - John M Maris
- The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
| | - Douglas S Hawkins
- Division of Hematology/Oncology, Seattle Children's Hospital, Seattle, Washington
| | - Brian P Rubin
- Departments of Pathology and Cancer Biology, Robert J Tomsich Pathology and Laboratory Medicine Institute and Cleveland Clinic, Cleveland, Ohio
| | | | - Peter J Houghton
- Greehey Children's Cancer Research Institute, San Antonio, Texas
| | | | - E Anders Kolb
- Nemours Center for Cancer and Blood Disorders, Wilmington, Delaware
| | - Min H Kang
- Texas Tech University Health Sciences Center, Lubbock, Texas
| | | | | | | | | | - Louis F Stancato
- Eli Lilly and Company, Lilly Corporate Center, Indianapolis, Indiana.
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20
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Abstract
PARP1 inhibitors are approved therapeutic agents in ovarian carcinomas, and have clinical activity in some breast cancers. As a single agent, niraparib killed ovarian and mammary tumor cells via an ATM-AMPK-ULK1 pathway which resulted in mTOR inactivation and the formation of autophagosomes, temporally followed by autolysosome formation. In parallel, niraparib activated a CD95-FADD-caspase 8 pathway, and collectively these signals caused tumor cell death that was suppressed by knock down of Beclin1, ATG5, CD95, FADD or AIF; or by expression of c-FLIP-s, BCL-XL or dominant negative caspase 9. The HDAC inhibitors AR42 and sodium valproate enhanced niraparib lethality in a greater than additive fashion. HDAC inhibitors enhanced niraparib lethality by increasing activation of the ATM-AMPK-ULK1-autophagy and CD95-FADD-caspase 8 pathways. Knock down of eIF2α, ATM, AMPKα, ULK1, Beclin1 or ATG5 reduced tumor cell killing by the niraparib plus HDAC inhibitor combination. Blockade of either caspase 9 function or that of cathepsin B partially prevented cell death. As a single agent niraparib delayed tumor growth, but did not significantly alter the tumor control rate. Tumors previously exposed to niraparib had activated the ERK1/2 and AKT-mTOR pathways that correlated with increased plasma levels of IL-8, MIF, EGF, uPA and IL-12. Collectively our findings argue that the addition of HDAC inhibitors to niraparib enhances the anti-cancer activity of the PARP1 inhibitor niraparib.
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Affiliation(s)
- Laurence Booth
- a Departments of Biochemistry and Molecular Biology , Virginia Commonwealth University , Richmond , VA , USA
| | - Jane L Roberts
- a Departments of Biochemistry and Molecular Biology , Virginia Commonwealth University , Richmond , VA , USA
| | - Rumeesa Rais
- a Departments of Biochemistry and Molecular Biology , Virginia Commonwealth University , Richmond , VA , USA
| | | | - Paul Dent
- a Departments of Biochemistry and Molecular Biology , Virginia Commonwealth University , Richmond , VA , USA
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21
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Thatte J, Massimi P, Thomas M, Boon SS, Banks L. The Human Papillomavirus E6 PDZ Binding Motif Links DNA Damage Response Signaling to E6 Inhibition of p53 Transcriptional Activity. J Virol 2018; 92:e00465-18. [PMID: 29848585 DOI: 10.1128/JVI.00465-18] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Accepted: 05/21/2018] [Indexed: 02/07/2023] Open
Abstract
The presence of a PDZ binding motif (PBM) in the human papillomavirus (HPV) E6 oncoprotein appears to be a characteristic marker of high oncogenic potential and confers interaction with a number of different cellular PDZ domain-containing substrates. The E6 PBM is also subject to phosphorylation, resulting in inhibition of E6 PDZ binding activity and instead allowing E6 to associate with 14-3-3 proteins. In this study, we analyzed the conditions under which the E6 PBM is phosphorylated. We demonstrate that in normal cycling cells, the levels of E6 phosphorylation are very low. However, following exposure of cells to oxidative stress or the induction of DNA damage, there is a striking increase in the levels of E6 phosphorylation. Depending on the specific stimulus, this phosphorylation of E6 can involve the ATM/ATR pathway and is performed primarily through Chk1, although the Chk2 pathway is also involved indirectly through activation of protein kinase A (PKA). To understand the biological relevance of these phospho-modifications of E6, we analyzed their effects upon the ability of E6 to inhibit p53 transcriptional activity. We show that an intact E6 phospho-acceptor site plays an essential role in the ability of E6 to inhibit p53 transcriptional activity on a subset of p53-responsive promoters in a manner that is independent of E6's ability to direct p53 degradation. These results are, to our knowledge, the first example of a DNA damage response controlling PBM-PDZ recognition. This study also provides links between the DNA damage response, the regulation of E6 PBM function, and the inhibition of p53 activity and begins to explain how HPV-infected cells remain within the cell cycle, despite activation of DNA damage response pathways during productive virus infections.IMPORTANCE The cancer-causing HPV E6 oncoproteins all possess a PDZ binding motif at their extreme carboxy termini. Depending upon whether this motif is phosphorylated, E6 can recognize PDZ domain-containing proteins or members of the 14-3-3 family of proteins. We show here that DNA damage response pathways directly signal to the E6 PBM, resulting in Chk1- and Chk2-driven phosphorylation. This phosphorylation is particularly pronounced following treatment of cells with a variety of different chemotherapeutic drugs. A direct functional consequence of this signaling is to confer an enhanced ability upon E6 to inhibit p53 transcriptional activity in a proteasome-independent but phosphorylation-dependent manner. These results are the first example of DNA damage signaling pathways regulating PBM-PDZ interactions and provide the mechanistic link between E6 PBM function and perturbation of p53 activity.
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22
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Abstract
Inhibitors of PARP1 are approved therapeutic agents in ovarian carcinomas. We determined whether the novel clinically relevant CHK1 inhibitor SRA737 interacted with PARP1 inhibitors to kill carcinoma cells. In multiple mammary and ovarian cancer lines SRA737 synergized with the PARP1 inhibitors olaparib and niraparib to cause cell death. The [SRA737 + niraparib] drug combination activated an ATM-AMPK-ULK1-mTOR pathway which resulted in the formation of autophagosomes, temporally followed by autolysosome formation. Phosphorylation of ULK1 S317 was essential for kinase activation against ATG13. The drug combination elevated eIF2α phosphorylation which was causal at increasing Beclin1 and ATG5 expression, reducing MCL-1 and BCL-XL levels, and causing CD95 activation. Knock down of CD95, eIF2α, ATM, AMPKα, ULK1, Beclin1 or ATG5 reduced drug combination lethality. Blockade of either caspase 9 function or that of AIF each partially prevented cell death. Expression of activated mTOR or of c-FLIP-s or of BCL-XL reduced cell killing. In vivo, SRA737 and niraparib interacted in an additive fashion to suppress the growth of mammary tumors. Multiplex analyses revealed that drug combination treated tumors had reduced their plasma levels of sERBB1, sERBB2, sVEGFR1, sVEGFR2, sIL-6R, HGF, PDGFAB/BB and CXCL16 and enhanced the levels of CCL26, IL-8 and MIF. Surviving tumors had activated ERK1/2 and AKT. This finding argues that IL-8/ERK/AKT signaling may be an evolutionary survival response to [SRA737 + niraparib].
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Affiliation(s)
- Laurence Booth
- a Department of Biochemistry and Molecular Biology , Virginia Commonwealth University , Richmond , VA , USA
| | - Jane Roberts
- a Department of Biochemistry and Molecular Biology , Virginia Commonwealth University , Richmond , VA , USA
| | - Andrew Poklepovic
- b Department of Medicine , Virginia Commonwealth University , Richmond , VA , USA
| | - Paul Dent
- a Department of Biochemistry and Molecular Biology , Virginia Commonwealth University , Richmond , VA , USA
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23
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Yang M, Ahmed H, Wu W, Jiang B, Jia Z. Cytotoxicity of Air Pollutant 9,10-Phenanthrenequinone: Role of Reactive Oxygen Species and Redox Signaling. Biomed Res Int 2018; 2018:9523968. [PMID: 29984252 DOI: 10.1155/2018/9523968] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/03/2018] [Accepted: 04/30/2018] [Indexed: 01/22/2023]
Abstract
Atmospheric pollution has been a principal topic recently in the scientific and political community due to its role and impact on human and ecological health. 9,10-phenanthrenequinone (9,10-PQ) is a quinone molecule found in air pollution abundantly in the diesel exhaust particles (DEP). This compound has studied extensively and has been shown to develop cytotoxic effects both in vitro and in vivo. 9, 10-PQ has been proposed to play a critical role in the development of cytotoxicity via generation of reactive oxygen species (ROS) through redox cycling. This compound also reduces expression of glutathione (GSH), which is critical in Phase II detoxification reactions. Understanding the underlying cellular mechanisms involved in cytotoxicity can allow for the development of therapeutics designed to target specific molecules significantly involved in the 9,10-PQ-induced ROS toxicity. This review highlights the developments in the understanding of the cytotoxic effects of 9, 10-PQ with special emphasis on the possible mechanisms involved.
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Abstract
OPINION STATEMENT The single agent activity of PARP inhibitors (PARPi) in germline BRCA mutated (gBRCAm) breast and ovarian cancer suggests untapped potential for this new class of drug in breast cancer. The US Food and Drug Administration has approved three PARPi (olaparib, rucaparib, and niraparib) so far to treat certain ovarian cancers, including those with gBRCAm and olaparib for treatment of gBRCAm breast cancers. Several PARPi are now under clinical development for breast cancer in the various treatment settings. Recently, two phase III trials of olaparib (OlympiaD) and talazoparib (EMBRACA) demonstrated 3-month progression-free survival improvement with PARPi compared to physician's choice single agent chemotherapy in metastatic gBRCAm breast cancer. To date, PARPi seems less efficacious in metastatic breast cancer patients than those with BRCA mutated platinum-sensitive recurrent ovarian cancer, perhaps reflecting the biologic heterogeneity and low somatic BRCA mutation rate in breast cancer. The use of PARPi is gradually evolving, including combination strategies with chemotherapy, targeted agents, radiotherapy, or immunotherapy in women with and without gBRCAm. The role of predictive biomarkers, including molecular signatures and homologous recombination repair deficiency scores based on loss of heterozygosity and other structural genomic aberrations, will be crucial to identify a subgroup of patients who may have benefit from PARPi. An improved understanding of the mechanisms underlying PARPi clinical resistance will also be important to enable the development of new approaches to increase efficacy. This is a field rich in opportunity, and the coming years should see a better understanding of which breast cancer patients we should treat with PARPi and where these agents should come in over the course of treatment.
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Affiliation(s)
- Alexandra S Zimmer
- Women's Malignancies Branch, Center for Cancer Research, National Cancer Institute, 10 Center Dr. MSC1906 Building 10, Room 4B54, Bethesda, MD, 20892-1906, USA.
| | - Mitchell Gillard
- School of Medicine, Stony Brook University School of Medicine, 101 Nicolls Road Stony Brook, Bethesda, NY, 11794-8434, USA
| | - Stanley Lipkowitz
- Women's Malignancies Branch, Center for Cancer Research, National Cancer Institute, 10 Center Dr. MSC1906 Building 10, Room 4B54, Bethesda, MD, 20892-1906, USA
| | - Jung-Min Lee
- Women's Malignancies Branch, Center for Cancer Research, National Cancer Institute, 10 Center Dr. MSC1906 Building 10, Room 4B54, Bethesda, MD, 20892-1906, USA
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25
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Brill E, Yokoyama T, Nair J, Yu M, Ahn YR, Lee JM. Prexasertib, a cell cycle checkpoint kinases 1 and 2 inhibitor, increases in vitro toxicity of PARP inhibition by preventing Rad51 foci formation in BRCA wild type high-grade serous ovarian cancer. Oncotarget 2017; 8:111026-111040. [PMID: 29340034 PMCID: PMC5762302 DOI: 10.18632/oncotarget.22195] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Accepted: 08/31/2017] [Indexed: 12/17/2022] Open
Abstract
PARP inhibitors (PARPi) have been effective in high-grade serous ovarian cancer (HGSOC), although clinical activity is limited against BRCA wild type HGSOC. The nearly universal loss of normal p53 regulation in HGSOCs causes dysfunction in the G1/S checkpoint, making tumor cells reliant on Chk1-mediated G2/M cell cycle arrest for DNA repair. Therefore, Chk1 is a reasonable target for a combination strategy with PARPi in treating BRCA wild type HGSOC. Here we investigated the combination of prexasertib mesylate monohydrate (LY2606368), a Chk1 and Chk2 inhibitor, and a PARP inhibitor, olaparib, in HGSOC cell lines (OVCAR3, OV90, PEO1 and PEO4) using clinically attainable concentrations. Our findings showed combination treatment synergistically decreased cell viability in all cell lines and induced greater DNA damage and apoptosis than the control and/or monotherapies (p<0.05). Treatment with olaparib in BRCA wild type HGSOC cells caused formation of Rad51 foci, whereas the combination treatment with prexasertib inhibited transnuclear localization of Rad51, a key protein in homologous recombination repair. Overall, our data provide evidence that prexasertib and olaparib combination resulted in synergistic cytotoxic effects against BRCA wild type HGSOC cells through reduced Rad51 foci formation and greater induction of apoptosis. This may be a novel therapeutic strategy for HGSOC.
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Affiliation(s)
- Ethan Brill
- Women's Malignancies Branch, Center for Cancer Research, National Cancer Institute, Bethesda, MD 20892, USA
| | - Takuhei Yokoyama
- Women's Malignancies Branch, Center for Cancer Research, National Cancer Institute, Bethesda, MD 20892, USA
| | - Jayakumar Nair
- Women's Malignancies Branch, Center for Cancer Research, National Cancer Institute, Bethesda, MD 20892, USA
| | - Minshu Yu
- Women's Malignancies Branch, Center for Cancer Research, National Cancer Institute, Bethesda, MD 20892, USA
| | - Yeong-Ran Ahn
- Women's Malignancies Branch, Center for Cancer Research, National Cancer Institute, Bethesda, MD 20892, USA
| | - Jung-Min Lee
- Women's Malignancies Branch, Center for Cancer Research, National Cancer Institute, Bethesda, MD 20892, USA
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26
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Abstract
The cell cycle checkpoint proteins ataxia-telangiectasia-mutated-and-Rad3-related kinase (ATR) and its major downstream effector checkpoint kinase 1 (CHK1) prevent the entry of cells with damaged or incompletely replicated DNA into mitosis when the cells are challenged by DNA damaging agents, such as radiation therapy (RT) or chemotherapeutic drugs, that are the major modalities to treat cancer. This regulation is particularly evident in cells with a defective G1 checkpoint, a common feature of cancer cells, due to p53 mutations. In addition, ATR and/or CHK1 suppress replication stress (RS) by inhibiting excess origin firing, particularly in cells with activated oncogenes. Those functions of ATR/CHK1 make them ideal therapeutic targets. ATR/CHK1 inhibitors have been developed and are currently used either as single agents or paired with radiotherapy or a variety of genotoxic chemotherapies in preclinical and clinical studies. Here, we review the status of the development of ATR and CHK1 inhibitors. We also discuss the potential mechanisms by which ATR and CHK1 inhibition induces cell killing in the presence or absence of exogenous DNA damaging agents, such as RT and chemotherapeutic agents. Lastly, we discuss synthetic lethality interactions between the inhibition of ATR/CHK1 and defects in other DNA damage response (DDR) pathways/genes.
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Affiliation(s)
- Zhaojun Qiu
- Department of Radiation Oncology, School of Medicine, Case Western Reserve University, Cleveland, USA
| | - Nancy L Oleinick
- Department of Radiation Oncology, School of Medicine, Case Western Reserve University, Cleveland, USA; Case Comprehensive Cancer Center, Case Western Reserve University, Cleveland, USA
| | - Junran Zhang
- Department of Radiation Oncology, School of Medicine, Case Western Reserve University, Cleveland, USA; Case Comprehensive Cancer Center, Case Western Reserve University, Cleveland, USA.
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Carrassa L, Damia G. DNA damage response inhibitors: Mechanisms and potential applications in cancer therapy. Cancer Treat Rev 2017; 60:139-151. [PMID: 28961555 DOI: 10.1016/j.ctrv.2017.08.013] [Citation(s) in RCA: 111] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2017] [Revised: 07/26/2017] [Accepted: 08/01/2017] [Indexed: 02/06/2023]
Abstract
Over the last decade the unravelling of the molecular mechanisms of the DNA damage response pathways and of the genomic landscape of human tumors have paved the road to new therapeutic approaches in oncology. It is now clear that tumors harbour defects in different DNA damage response steps, mainly signalling and repair, rendering them more dependent on the remaining pathways. We here focus on the proteins ATM, ATR, CHK1 and WEE1, reviewing their roles in the DNA damage response and as targets in cancer therapy. In the last decade specific inhibitors of these proteins have been designed, and their potential antineoplastic activity has been explored both in monotherapy strategies against tumors with specific defects (synthetic lethality approach) and in combination with radiotherapy or chemotherapeutic or molecular targeted agents. The preclinical and clinical evidence of antitumor activity of these inhibitors emanating from these research efforts will be critically reviewed. Lastly, the potential therapeutic feasibility of combining together such inhibitors with the aim to target particular subsets of tumors will be also discussed.
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Affiliation(s)
- Laura Carrassa
- Laboratory of Molecular Pharmacology, Department of Oncology, IRCCS - Istituto di Ricerche Farmacologiche "Mario Negri", Milan, Italy.
| | - Giovanna Damia
- Laboratory of Molecular Pharmacology, Department of Oncology, IRCCS - Istituto di Ricerche Farmacologiche "Mario Negri", Milan, Italy.
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28
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Goss KL, Koppenhafer SL, Harmoney KM, Terry WW, Gordon DJ. Inhibition of CHK1 sensitizes Ewing sarcoma cells to the ribonucleotide reductase inhibitor gemcitabine. Oncotarget 2017; 8:87016-87032. [PMID: 29152060 PMCID: PMC5675612 DOI: 10.18632/oncotarget.18776] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Accepted: 05/22/2017] [Indexed: 12/22/2022] Open
Abstract
Ewing sarcoma is a bone and soft tissue sarcoma that occurs in children and young adults. The EWS-FLI1 gene fusion is the driver mutation in most Ewing sarcoma tumors and functions, in part, as an aberrant transcription factor. We recently identified that Ewing sarcoma cells are sensitive to inhibition of ribonucleotide reductase (RNR), which catalyzes the formation of deoxyribonucleotides from ribonucleotides. In this report, we show that Ewing sarcoma cells are sensitive to treatment with clofarabine, which is a nucleoside analogue and allosteric inhibitor of RNR. However, clofarabine is a reversible inhibitor of RNR and we found that the effect of clofarabine is limited when using a short (6-hour) drug treatment. Gemcitabine, on the other hand, is an irreversible inhibitor of the RRM1 subunit of RNR and this drug induces apoptosis in Ewing sarcoma cells when used in both 6-hour and longer drug treatments. Treatment of Ewing sarcoma cells with gemcitabine also results in activation of checkpoint kinase 1 (CHK1), which is a critical mediator of cell survival in the setting of impaired DNA replication. Notably, inhibition of CHK1 function in Ewing sarcoma cells using a small-molecule CHK1 inhibitor, or siRNA knockdown, in combination with gemcitabine results in increased toxicity both in vitro and in vivo in a mouse xenograft experiment. Overall, our results provide insight into Ewing sarcoma biology and identify a candidate therapeutic target, and drug combination, in Ewing sarcoma.
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Affiliation(s)
- Kelli L Goss
- Department of Pediatrics, Division of Pediatric Hematology/Oncology, University of Iowa, Iowa City, Iowa 52242, USA
| | - Stacia L Koppenhafer
- Department of Pediatrics, Division of Pediatric Hematology/Oncology, University of Iowa, Iowa City, Iowa 52242, USA
| | - Kathryn M Harmoney
- Department of Pediatrics, Division of Pediatric Hematology/Oncology, University of Iowa, Iowa City, Iowa 52242, USA
| | - William W Terry
- Department of Pediatrics, Division of Pediatric Hematology/Oncology, University of Iowa, Iowa City, Iowa 52242, USA
| | - David J Gordon
- Department of Pediatrics, Division of Pediatric Hematology/Oncology, University of Iowa, Iowa City, Iowa 52242, USA
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29
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Sen T, Tong P, Stewart CA, Cristea S, Valliani A, Shames DS, Redwood AB, Fan YH, Li L, Glisson BS, Minna JD, Sage J, Gibbons DL, Piwnica-Worms H, Heymach JV, Wang J, Byers LA. CHK1 Inhibition in Small-Cell Lung Cancer Produces Single-Agent Activity in Biomarker-Defined Disease Subsets and Combination Activity with Cisplatin or Olaparib. Cancer Res 2017; 77:3870-3884. [PMID: 28490518 DOI: 10.1158/0008-5472.can-16-3409] [Citation(s) in RCA: 133] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Revised: 03/15/2017] [Accepted: 05/03/2017] [Indexed: 12/18/2022]
Abstract
Effective targeted therapies for small-cell lung cancer (SCLC), the most aggressive form of lung cancer, remain urgently needed. Here we report evidence of preclinical efficacy evoked by targeting the overexpressed cell-cycle checkpoint kinase CHK1 in SCLC. Our studies employed RNAi-mediated attenuation or pharmacologic blockade with the novel second-generation CHK1 inhibitor prexasertib (LY2606368), currently in clinical trials. In SCLC models in vitro and in vivo, LY2606368 exhibited strong single-agent efficacy, augmented the effects of cisplatin or the PARP inhibitor olaparib, and improved the response of platinum-resistant models. Proteomic analysis identified CHK1 and MYC as top predictive biomarkers of LY2606368 sensitivity, suggesting that CHK1 inhibition may be especially effective in SCLC with MYC amplification or MYC protein overexpression. Our findings provide a preclinical proof of concept supporting the initiation of a clinical efficacy trial in patients with platinum-sensitive or platinum-resistant relapsed SCLC. Cancer Res; 77(14); 3870-84. ©2017 AACR.
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Affiliation(s)
- Triparna Sen
- Department of Thoracic/Head and Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Pan Tong
- Department of Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - C Allison Stewart
- Department of Thoracic/Head and Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Sandra Cristea
- Department of Pediatrics, Stanford University, Stanford, California
- Department of Genetics, Stanford University, Stanford, California
| | - Aly Valliani
- Department of Thoracic/Head and Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - David S Shames
- Department of Oncology Biomarker Development, Genentech Inc., South San Francisco, California
| | - Abena B Redwood
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - You Hong Fan
- Department of Thoracic/Head and Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Lerong Li
- Department of Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Bonnie S Glisson
- Department of Thoracic/Head and Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - John D Minna
- Hamon Center for Therapeutic Oncology Research, The University of Texas Southwestern, Dallas, Texas
| | - Julien Sage
- Department of Pediatrics, Stanford University, Stanford, California
- Department of Genetics, Stanford University, Stanford, California
| | - Don L Gibbons
- Department of Thoracic/Head and Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
- Department of Molecular and Cellular Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Helen Piwnica-Worms
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - John V Heymach
- Department of Thoracic/Head and Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
- Department of Cancer Biology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Jing Wang
- Department of Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Lauren Averett Byers
- Department of Thoracic/Head and Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas.
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30
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Rundle S, Bradbury A, Drew Y, Curtin NJ. Targeting the ATR-CHK1 Axis in Cancer Therapy. Cancers (Basel) 2017; 9:E41. [PMID: 28448462 DOI: 10.3390/cancers9050041] [Citation(s) in RCA: 133] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Revised: 04/23/2017] [Accepted: 04/25/2017] [Indexed: 12/14/2022] Open
Abstract
Targeting the DNA damage response (DDR) is a new therapeutic approach in cancer that shows great promise for tumour selectivity. Key components of the DDR are the ataxia telangiectasia mutated and Rad3 related (ATR) and checkpoint kinase 1 (CHK1) kinases. This review article describes the role of ATR and its major downstream target, CHK1, in the DDR and why cancer cells are particularly reliant on the ATR-CHK1 pathway, providing the rationale for targeting these kinases, and validation of this hypothesis by genetic manipulation. The recent development of specific inhibitors and preclinical data using these inhibitors not only as chemosensitisers and radiosensitisers but also as single agents to exploit specific pathologies of tumour cells is described. These potent and specific inhibitors have now entered clinical trial and early results are presented.
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31
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Lin AB, McNeely SC, Beckmann RP. Achieving Precision Death with Cell-Cycle Inhibitors that Target DNA Replication and Repair. Clin Cancer Res 2017; 23:3232-3240. [PMID: 28331049 DOI: 10.1158/1078-0432.ccr-16-0083] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Revised: 11/29/2016] [Accepted: 03/15/2017] [Indexed: 11/16/2022]
Abstract
All cancers are characterized by defects in the systems that ensure strict control of the cell cycle in normal tissues. The consequent excess tissue growth can be countered by drugs that halt cell division, and, indeed, the majority of chemotherapeutics developed during the last century work by disrupting processes essential for the cell cycle, particularly DNA synthesis, DNA replication, and chromatid segregation. In certain contexts, the efficacy of these classes of drugs can be impressive, but because they indiscriminately block the cell cycle of all actively dividing cells, their side effects severely constrain the dose and duration with which they can be administered, allowing both normal and malignant cells to escape complete growth arrest. Recent progress in understanding how cancers lose control of the cell cycle, coupled with comprehensive genomic profiling of human tumor biopsies, has shown that many cancers have mutations affecting various regulators and checkpoints that impinge on the core cell-cycle machinery. These defects introduce unique vulnerabilities that can be exploited by a next generation of drugs that promise improved therapeutic windows in patients whose tumors bear particular genomic aberrations, permitting increased dose intensity and efficacy. These developments, coupled with the success of new drugs targeting cell-cycle regulators, have led to a resurgence of interest in cell-cycle inhibitors. This review in particular focuses on the newer strategies that may facilitate better therapeutic targeting of drugs that inhibit the various components that safeguard the fidelity of the fundamental processes of DNA replication and repair. Clin Cancer Res; 23(13); 3232-40. ©2017 AACR.
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Affiliation(s)
- Aimee Bence Lin
- Early Phase Medical-Oncology, Eli Lilly and Company, Lilly Corporate Center, Indianapolis, Indiana
| | - Samuel C McNeely
- Oncology Business Unit-Patient Tailoring, Eli Lilly and Company, Lilly Corporate Center, Indianapolis, Indiana
| | - Richard P Beckmann
- Oncology Translational Research, Eli Lilly and Company, Lilly Corporate Center, Indianapolis, Indiana.
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32
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Rimar KJ, Tran PT, Matulewicz RS, Hussain M, Meeks JJ. The emerging role of homologous recombination repair and PARP inhibitors in genitourinary malignancies. Cancer 2017; 123:1912-1924. [PMID: 28323334 DOI: 10.1002/cncr.30631] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Revised: 12/27/2016] [Accepted: 01/20/2017] [Indexed: 01/07/2023]
Abstract
As cells age and are exposed to genotoxic stress, preservation of the genomic code requires multiple DNA repair pathways to remove single-strand or double-strand breaks. Loss of function somatic genomic aberrations or germline deficiency in genes involved in DNA repair can result in acute cell death or, after a latency period, cellular transformation. Therapeutic exploitation of DNA repair by inhibition of poly (adenosine diphosphate [ADP]) ribose polymerases (PARP), a family of enzymes involved in the repair of single-strand and in some cases double-strand breaks, has become a novel cancer treatment. Although the application of PARP inhibitors (PARPis) initially focused on tumors with BRCA1 or BRCA2 deficiencies, synthetic susceptibilities to PARPis have been expanded due to the identification of tumors with mutations pathways involved in DNA damage repair, in particular those that repair double-strand breaks using homologous recombination (HR). There is an increasing appreciation that genitourinary (GU) malignancies, including bladder cancer and especially prostate cancer, contain subsets of patients with germline and somatic alterations in HR genes that may reflect an increased response to PARPis. In this review, the authors describe the mechanisms and rationale of the use of PARPis in patients with GU cancers, summarize previously reported preclinical and clinical trials, and identify ongoing trials to determine how PARPis and strategies targeted at HR repair can have widespread application in patients with GU cancers. Cancer 2017;123:1912-1924. © 2017 American Cancer Society.
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Affiliation(s)
- Kalen J Rimar
- Department of Urology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois
| | - Phuoc T Tran
- Department of Radiation Oncology and Molecular Radiation Sciences, Johns Hopkins University School of Medicine, Baltimore, Maryland.,Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, Maryland.,Department of Urology, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Richard S Matulewicz
- Department of Urology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois
| | - Maha Hussain
- Division of Hematology/Oncology, Department of Medicine, Feinberg School of Medicine, Northwestern University, Chicago, Illinois
| | - Joshua J Meeks
- Department of Urology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois
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33
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Abstract
Persistent dysregulation of the DNA damage response and repair in cells causes genomic instability. The resulting genetic changes permit alterations in growth and proliferation observed in virtually all cancers. However, an unstable genome can serve as a double-edged sword by providing survival advantages in the ability to evade checkpoint signaling, but also creating vulnerabilities through dependency on alternative genomic maintenance factors. The Fanconi anemia pathway comprises an intricate network of DNA damage signaling and repair that are critical for protection against genomic instability. The importance of this pathway is underlined by the severity of the cancer predisposing syndrome Fanconi anemia which can be caused by biallelic mutations in any one of the 21 genes known thus far. This review delineates the roles of the Fanconi anemia pathway and the molecular actions of Fanconi anemia proteins in confronting replicative, oxidative, and mitotic stress.
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Affiliation(s)
- Anna Palovcak
- Department of Biochemistry and Molecular Biology, University of Miami Miller School of Medicine, Gautier Building Room 311, 1011 NW 15th Street, Miami, FL 33136 USA
| | - Wenjun Liu
- Department of Biochemistry and Molecular Biology, University of Miami Miller School of Medicine, Gautier Building Room 311, 1011 NW 15th Street, Miami, FL 33136 USA
| | - Fenghua Yuan
- Department of Biochemistry and Molecular Biology, University of Miami Miller School of Medicine, Gautier Building Room 311, 1011 NW 15th Street, Miami, FL 33136 USA
| | - Yanbin Zhang
- Department of Biochemistry and Molecular Biology, University of Miami Miller School of Medicine, Gautier Building Room 311, 1011 NW 15th Street, Miami, FL 33136 USA
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34
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Chen H, Huang Y, Huang J, Lin L, Wei G. Gigantol attenuates the proliferation of human liver cancer HepG2 cells through the PI3K/Akt/NF-κB signaling pathway. Oncol Rep 2016; 37:865-870. [DOI: 10.3892/or.2016.5299] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Accepted: 07/28/2016] [Indexed: 11/06/2022] Open
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35
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Abstract
In 2014, olaparib (Lynparza) became the first PARP (Poly(ADP-ribose) polymerase) inhibitor to be approved for the treatment of cancer. When used as single agents, PARP inhibitors can selectively target tumour cells with BRCA1 or BRCA2 tumour suppressor gene mutations through synthetic lethality. However, PARP inhibition also shows considerable promise when used together with other therapeutic agents. Here, we summarise both the pre-clinical and clinical evidence for the utility of such combinations and discuss the future prospects and challenges for PARP inhibitor combinatorial therapies.
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Affiliation(s)
- Amy Dréan
- The CRUK Gene Function Laboratory, The Breakthrough Breast Cancer Research Centre, The Institute of Cancer Research, London SW3 6JB, UK
| | - Christopher J Lord
- The CRUK Gene Function Laboratory, The Breakthrough Breast Cancer Research Centre, The Institute of Cancer Research, London SW3 6JB, UK.
| | - Alan Ashworth
- UCSF Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, CA 94158, USA.
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36
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Zhao X, Jiang K, Liang B, Huang X. Anticancer effect of xanthohumol induces growth inhibition and apoptosis of human liver cancer through NF-κB/p53-apoptosis signaling pathway. Oncol Rep 2015; 35:669-75. [PMID: 26718026 PMCID: PMC4689487 DOI: 10.3892/or.2015.4455] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Accepted: 09/23/2015] [Indexed: 12/29/2022] Open
Abstract
Xanthohumol may prevent and cure diabetes and atherosis, have oxidation resistance and antiviral function as well as anticancer effect preventing cancer cell metastasis. We investigate whether the anticancer effect of xanthohumol induces growth inhibition and apoptosis of human liver cancer through NF-κB/p53-apoptosis signaling pathway. Human liver cancer HepG2 cell were treated with 10, 20, 30 and 40 µM xanthohumol for 48 h. The present study showed that the anticancer effect of xanthohumol was effective in inhibiting proliferation and inducing apoptosis of human liver cancer HepG2 cells. Furthermore, the caspase-3 activity of human liver cancer HepG2 cells was increased by xanthohumol. In addition, 48-h treatment with xanthohumol suppressed NF-κB expression and promoted p53, cleaved PARP, AIF and cytochrome c expression and downregulated XIAP and Bcl-2/Bax expression in human liver cancer HepG2 cells. Therefore, the anticancer effect of xanthohumol induces growth inhibition and apoptosis of human liver cancer through the NF-κB/p53-apoptosis signaling pathway.
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Affiliation(s)
- Xiangqian Zhao
- Hospital and Institute of Hepatobiliary Surgery, Chinese PLA General Hospital, Beijing 100853, P.R. China
| | - Kai Jiang
- Hospital and Institute of Hepatobiliary Surgery, Chinese PLA General Hospital, Beijing 100853, P.R. China
| | - Bin Liang
- Hospital and Institute of Hepatobiliary Surgery, Chinese PLA General Hospital, Beijing 100853, P.R. China
| | - Xiaoqiang Huang
- Hospital and Institute of Hepatobiliary Surgery, Chinese PLA General Hospital, Beijing 100853, P.R. China
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37
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WANG XINHONG, LIU MINGNA, HUANG PING, XU JUN, LIU AIYUN, CHEN JING, LV CHENGQIAN, XU RUILING. Simultaneous silencing of β-catenin and signal transducer and activator of transcription 3 synergistically induces apoptosis and inhibits cell proliferation in HepG2 liver cancer cells. Mol Med Rep 2015; 12:2263-8. [DOI: 10.3892/mmr.2015.3595] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2014] [Accepted: 03/05/2015] [Indexed: 11/06/2022] Open
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38
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Shen Y, Aoyagi-Scharber M, Wang B. Trapping Poly(ADP-Ribose) Polymerase. J Pharmacol Exp Ther 2015; 353:446-57. [DOI: 10.1124/jpet.114.222448] [Citation(s) in RCA: 140] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2014] [Accepted: 03/09/2015] [Indexed: 12/16/2022] Open
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Manic G, Obrist F, Sistigu A, Vitale I. Trial Watch: Targeting ATM-CHK2 and ATR-CHK1 pathways for anticancer therapy. Mol Cell Oncol 2015; 2:e1012976. [PMID: 27308506 PMCID: PMC4905354 DOI: 10.1080/23723556.2015.1012976] [Citation(s) in RCA: 108] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Revised: 01/25/2015] [Accepted: 01/26/2015] [Indexed: 02/08/2023]
Abstract
The ataxia telangiectasia mutated serine/threonine kinase (ATM)/checkpoint kinase 2 (CHEK2, best known as CHK2) and the ATM and Rad3-related serine/threonine kinase (ATR)/CHEK1 (best known as CHK1) cascades are the 2 major signaling pathways driving the DNA damage response (DDR), a network of processes crucial for the preservation of genomic stability that act as a barrier against tumorigenesis and tumor progression. Mutations and/or deletions of ATM and/or CHK2 are frequently found in tumors and predispose to cancer development. In contrast, the ATR-CHK1 pathway is often upregulated in neoplasms and is believed to promote tumor growth, although some evidence indicates that ATR and CHK1 may also behave as haploinsufficient oncosuppressors, at least in a specific genetic background. Inactivation of the ATM-CHK2 and ATR-CHK1 pathways efficiently sensitizes malignant cells to radiotherapy and chemotherapy. Moreover, ATR and CHK1 inhibitors selectively kill tumor cells that present high levels of replication stress, have a deficiency in p53 (or other DDR players), or upregulate the ATR-CHK1 module. Despite promising preclinical results, the clinical activity of ATM, ATR, CHK1, and CHK2 inhibitors, alone or in combination with other therapeutics, has not yet been fully demonstrated. In this Trial Watch, we give an overview of the roles of the ATM-CHK2 and ATR-CHK1 pathways in cancer initiation and progression, and summarize the results of clinical studies aimed at assessing the safety and therapeutic profile of regimens based on inhibitors of ATR and CHK1, the only 2 classes of compounds that have so far entered clinics.
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Affiliation(s)
- Gwenola Manic
- Regina Elena National Cancer Institute ; Rome, Italy
| | - Florine Obrist
- Université Paris-Sud/Paris XI; Le Kremlin-Bicêtre, France; INSERM, UMRS1138; Paris, France; Equipe 11 labelisée par la Ligue Nationale contre le Cancer; Centre de Recherche des Cordeliers; Paris, France; Gustave Roussy Cancer Campus; Villejuif, France
| | | | - Ilio Vitale
- Regina Elena National Cancer Institute; Rome, Italy; Department of Biology, University of Rome "TorVergata"; Rome, Italy
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40
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Stellas D, Souliotis VL, Bekyrou M, Smirlis D, Kirsch-Volders M, Degrassi F, Cundari E, Kyrtopoulos SA. Benzo[a]pyrene-induced cell cycle arrest in HepG2 cells is associated with delayed induction of mitotic instability. Mutat Res 2014; 769:59-68. [PMID: 25771725 DOI: 10.1016/j.mrfmmm.2014.07.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2014] [Revised: 06/19/2014] [Accepted: 07/11/2014] [Indexed: 06/04/2023]
Abstract
The environmental carcinogen benzo[a]pyrene (B[a]P) after being metabolised by cytochrome P450 enzymes forms DNA adducts. This abnormal situation induces changes in the cell cycle, DNA damage, chromosomal and mitotic aberrations, all of which may be related to carcinogenesis. In order to further investigate the mechanistic basis of these effects, HepG2 cells were treated with 3μM B[a]P for various time periods, followed by further incubation in the absence of B[a]P for up to 192h. B[a]P treatment led initially to S-phase arrest followed by recovery and subsequent induction of G2/M arrest, indicating activation of the corresponding DNA damage checkpoints. Immunofluorescence-based studies revealed accumulation of B[a]P-induced DNA adducts and chromosomal damage which persisted beyond mitosis and entry into a new cycle, thus giving rise to a new round of activation of the S-phase checkpoint. Prolonged further cultivation of the cells in the absence of B[a]P resulted in high frequencies of various abnormal mitotic events. Abrogation of the B[a]P-induced S-phase arrest by the Chk1 inhibitor UCN-01 triggered a strong apoptotic response but also dramatically decreased the frequency of mitotic abnormalities in the surviving cells, suggesting that events occurring during S-phase arrest contribute to the formation of delayed mitotic damage. Overall, our data demonstrate that, although S-phase arrest serves as a mechanism by which the cells reduce their load of genetic damage, its prolonged activation may also have a negative impact on the balance between cell death and heritable genetic damage.
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Affiliation(s)
- Dimitris Stellas
- Institute of Biology, Medicinal Chemistry and Biotechnology, National Hellenic Research Foundation, Athens, Greece.
| | - Vassilis L Souliotis
- Institute of Biology, Medicinal Chemistry and Biotechnology, National Hellenic Research Foundation, Athens, Greece
| | - Margarita Bekyrou
- Institute of Biology, Medicinal Chemistry and Biotechnology, National Hellenic Research Foundation, Athens, Greece
| | | | | | | | - Enrico Cundari
- Laboratory for Cell Genetics,Vrije Universiteit Brussel, Brussels, Belgium; Institute of Molecular Biology and Pathology C.N.R., Rome, Italy
| | - Soterios A Kyrtopoulos
- Institute of Biology, Medicinal Chemistry and Biotechnology, National Hellenic Research Foundation, Athens, Greece
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41
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Bryant C, Rawlinson R, Massey AJ. Chk1 inhibition as a novel therapeutic strategy for treating triple-negative breast and ovarian cancers. BMC Cancer 2014; 14:570. [PMID: 25104095 PMCID: PMC4137066 DOI: 10.1186/1471-2407-14-570] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2014] [Accepted: 07/28/2014] [Indexed: 12/31/2022] Open
Abstract
Background Chk1 inhibitors are currently in clinical trials as putative potentiators of cytotoxic chemotherapy drugs. Chk1 inhibitors may exhibit single agent anti-tumor activity in cancers with underlying DNA repair, DNA damage response or DNA replication defects. Methods Here we describe the cellular effects of the pharmacological inhibition of the checkpoint kinase Chk1 by the novel inhibitor V158411 in triple-negative breast cancer and ovarian cancer. Cytotoxicity, the effect on DNA damage response and cell cycle along with the ability to potentiate gemcitabine and cisplatin cytotoxicity in cultured cells was investigated. Western blotting of proteins involved in DNA repair, checkpoint activation, cell cycle and apoptosis was used to identify potential predictive biomarkers of Chk1 inhibitor sensitivity. Results The Chk1 inhibitors V158411, PF-477736 and AZD7762 potently inhibited the proliferation of triple-negative breast cancer cells as well as ovarian cancer cells, and these cell lines were sensitive compared to ER positive breast and other solid cancer cells lines. Inhibition of Chk1 in these sensitive cell lines induced DNA damage and caspase-3/7 dependent apoptosis. Western blot profiling identified pChk1 (S296) as a predictive biomarker of Chk1 inhibitor sensitivity in ovarian and triple-negative breast cancer and pH2AX (S139) in luminal breast cancer. Conclusions This finding suggests that Chk1 inhibitors either as single agents or in combination chemotherapy represents a viable therapeutic option for the treatment of triple-negative breast cancer. pChk1 (S296) tumor expression levels could serve as a useful biomarker to stratify patients who might benefit from Chk1 inhibitor therapy.
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Yadav L, Khan S, Shekh K, Jena G. Influence of 3-aminobenzamide, an inhibitor of poly(ADP-ribose)polymerase, in the evaluation of the genotoxicity of doxorubicin, cyclophosphamide and zidovudine in female mice. Mutation Research/Genetic Toxicology and Environmental Mutagenesis 2014; 770:6-15. [DOI: 10.1016/j.mrgentox.2014.04.020] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2013] [Revised: 02/22/2014] [Accepted: 04/05/2014] [Indexed: 11/29/2022]
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Li L, Chang W, Yang G, Ren C, Park S, Karantanos T, Karanika S, Wang J, Yin J, Shah PK, Takahiro H, Dobashi M, Zhang W, Efstathiou E, Maity SN, Aparicio AM, Li Ning Tapia EM, Troncoso P, Broom B, Xiao L, Lee HS, Lee JS, Corn PG, Navone N, Thompson TC. Targeting poly(ADP-ribose) polymerase and the c-Myb-regulated DNA damage response pathway in castration-resistant prostate cancer. Sci Signal 2014; 7:ra47. [PMID: 24847116 DOI: 10.1126/scisignal.2005070] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Androgen deprivation is the standard treatment for advanced prostate cancer (PCa), but most patients ultimately develop resistance and tumor recurrence. We found that MYB is transcriptionally activated by androgen deprivation therapy or genetic silencing of the androgen receptor (AR). MYB silencing inhibited PCa growth in culture and xenografts in mice. Microarray data revealed that c-Myb and AR shared a subset of target genes that encode DNA damage response (DDR) proteins, suggesting that c-Myb may supplant AR as the dominant regulator of their common DDR target genes in AR inhibition-resistant or AR-negative PCa. Gene signatures including AR, MYB, and their common DDR-associated target genes positively correlated with metastasis, castration resistance, tumor recurrence, and decreased survival in PCa patients. In culture and in xenograft-bearing mice, a combination strategy involving the knockdown of MYB, BRCA1, or TOPBP1 or the abrogation of cell cycle checkpoint arrest with AZD7762, an inhibitor of the checkpoint kinase Chk1, increased the cytotoxicity of the poly[adenosine 5'-diphosphate (ADP)-ribose] polymerase (PARP) inhibitor olaparib in PCa cells. Our results reveal new mechanism-based therapeutic approaches for PCa by targeting PARP and the DDR pathway involving c-Myb, TopBP1, ataxia telangiectasia mutated- and Rad3-related (ATR), and Chk1.
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Affiliation(s)
- Likun Li
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030-4009, USA
| | - Wenjun Chang
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030-4009, USA
| | - Guang Yang
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030-4009, USA
| | - Chengzhen Ren
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030-4009, USA
| | - Sanghee Park
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030-4009, USA
| | - Theodoros Karantanos
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030-4009, USA
| | - Styliani Karanika
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030-4009, USA
| | - Jianxiang Wang
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030-4009, USA
| | - Jianhua Yin
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030-4009, USA
| | - Parantu K Shah
- Institute for Applied Cancer Science, The University of Texas MD Anderson Cancer Center, Houston, TX 77030-4009, USA
| | - Hirayama Takahiro
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030-4009, USA
| | - Masato Dobashi
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030-4009, USA
| | - Wenling Zhang
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030-4009, USA
| | - Eleni Efstathiou
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030-4009, USA
| | - Sankar N Maity
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030-4009, USA
| | - Ana M Aparicio
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030-4009, USA
| | - Elsa M Li Ning Tapia
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030-4009, USA
| | - Patricia Troncoso
- Department of Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030-4009, USA
| | - Bradley Broom
- Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030-4009, USA
| | - Lianchun Xiao
- Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030-4009, USA
| | - Hyun-Sung Lee
- Systems Biology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030-4009, USA
| | - Ju-Seog Lee
- Systems Biology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030-4009, USA
| | - Paul G Corn
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030-4009, USA
| | - Nora Navone
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030-4009, USA
| | - Timothy C Thompson
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030-4009, USA.
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Shekh K, Khan S, Jena G, Kansara BR, Kushwaha S. 3-Aminobenzamide – a PARP inhibitor enhances the sensitivity of peripheral blood micronucleus and comet assays in mice. Toxicol Mech Methods 2014; 24:332-41. [DOI: 10.3109/15376516.2014.898355] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Abstract
It has been known for many years that manipulation of cell cycle checkpoint function represents one approach by which the toxicity of chemotherapy and of ionizing radiation can be increased in tumor cells.1-3 In particular, abrogation of the G2/M checkpoint has been shown to enhance the lethality of a wide range of toxic stresses.1-3 Inhibition of the G2/M checkpoint after chemotherapy/irradiation would result in tumor cells entering mitosis with damaged DNA, which would in turn result in loss of clonogenic survival (i.e., a lethal mitosis).
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Affiliation(s)
- Paul Dent
- Department of Biochemistry and Molecular Biology; Massey Cancer Center; Virginia Commonwealth University; Richmond, VA USA
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Booth L, Roberts JL, Conley A, Cruickshanks N, Ridder T, Grant S, Poklepovic A, Dent P. HDAC inhibitors enhance the lethality of low dose salinomycin in parental and stem-like GBM cells. Cancer Biol Ther 2013; 15:305-16. [PMID: 24351423 DOI: 10.4161/cbt.27309] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
The present studies determined whether the antibiotic salinomycin interacted with HDAC inhibitors to kill primary human GBM cells. Regardless of PTEN, ERBB1, or p53 mutational status salinomycin interacted with HDAC inhibitors in a synergistic fashion to kill GBM cells. Inhibition of CD95/Caspase 8 or of CD95/RIP-1/AIF signaling suppressed killing by the drug combination. Salinomycin increased the levels of autophagosomes that correlated with increased p62 and LC3II levels; valproate co-treatment correlated with reduced LC3II and p62 expression, and increased caspase 3 cleavage. Molecular inhibition of autophagosome formation was protective against drug exposure. The drug combination enhanced eIF2α phosphorylation and decreased expression of MCL-1 and phosphorylation of mTOR and p70 S6K. Activation of p70 S6K or mTOR promoted cell survival in the face of combined drug exposure. Overexpression of BCL-XL or c-FLIP-s was protective. Collectively our data demonstrate that the lethality of low nanomolar concentrations of salinomycin are enhanced by HDAC inhibitors in GBM cells and that increased death receptor signaling together with reduced mitochondrial function are causal in the combinatorial drug necro-apoptotic killing effect.
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Affiliation(s)
- Laurence Booth
- Department of Neurosurgery; Virginia Commonwealth University; Richmond, VA USA
| | - Jane L Roberts
- Department of Neurosurgery; Virginia Commonwealth University; Richmond, VA USA
| | - Adam Conley
- Department of Neurosurgery; Virginia Commonwealth University; Richmond, VA USA
| | | | - Thomas Ridder
- Department of Neurosurgery; Virginia Commonwealth University; Richmond, VA USA
| | - Steven Grant
- Department of Medicine; Virginia Commonwealth University; Richmond, VA USA
| | - Andrew Poklepovic
- Department of Medicine; Virginia Commonwealth University; Richmond, VA USA
| | - Paul Dent
- Department of Neurosurgery; Virginia Commonwealth University; Richmond, VA USA
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Booth L, Roberts JL, Cruickshanks N, Conley A, Durrant DE, Das A, Fisher PB, Kukreja RC, Grant S, Poklepovic A, Dent P. Phosphodiesterase 5 inhibitors enhance chemotherapy killing in gastrointestinal/genitourinary cancer cells. Mol Pharmacol 2013; 85:408-19. [PMID: 24353313 DOI: 10.1124/mol.113.090043] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
The present studies determined whether clinically relevant phosphodiesterase 5 (PDE5) inhibitors interacted with clinically relevant chemotherapies to kill gastrointestinal/genitourinary cancer cells. In bladder cancer cells, regardless of H-RAS mutational status, at clinically achievable doses, PDE5 inhibitors interacted in a greater than additive fashion with doxorubicin/mitomycin C/gemcitabine/cisplatin/paclitaxel to cause cell death. In pancreatic tumor cells expressing mutant active K-RAS, PDE5 inhibitors interacted in a greater than additive fashion with doxorubicin/gemcitabine/paclitaxel to cause cell death. The most potent PDE5 inhibitor was sildenafil. Knock down of PDE5 expression recapitulated the combination effects of PDE5 inhibitor drugs with chemotherapy drugs. Expression of cellular FLICE-like inhibitory protein-short did not significantly inhibit chemotherapy lethality but did significantly reduce enhanced killing in combination with sildenafil. Overexpression of B-cell lymphoma-extra large suppressed individual and combination drug toxicities. Knock down of CD95 or Fas-associated death domain protein suppressed drug combination toxicity. Combination toxicity was also abolished by necrostatin or receptor interacting protein 1 knock down. Treatment with PDE5 inhibitors and chemotherapy drugs promoted autophagy, which was maximal at ∼24 hour posttreatment, and 3-methyl adenine or knock down of Beclin1 suppressed drug combination lethality by ∼50%. PDE5 inhibitors enhanced and prolonged the induction of DNA damage as judged by Comet assays and γhistone 2AX (γH2AX) and checkpoint kinase 2 (CHK2) phosphorylation. Knock down of ataxia telangiectasia mutated suppressed γH2AX and CHK2 phosphorylation and enhanced drug combination lethality. Collectively our data demonstrate that the combination of PDE5 inhibitors with standard of care chemotherapy agents for gastrointestinal/genitourinary cancers represents a novel modality.
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Affiliation(s)
- Laurence Booth
- Departments of Biochemistry and Molecular Biology (L.B., J.L.R., N.C., A.C., P.D.), Cardiology (D.E.D., A.D., R.C.K.), Medicine (S.G., A.P.), Human and Molecular Genetics (P.B.F.), Virginia Commonwealth University, Richmond, Virginia
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Abstract
To many investigators PARP1 is simply a substrate for caspase 3, and whose cleavage is thought indicative of apoptosis. However, in reality PARP1 plays a major role in the biology of the cell cycle and DNA repair.1,2 PARP1 binds to damaged DNA where it becomes enzymatically activated and ADP ribosylates itself and other proteins. PARP facilitates DNA repair complex formation, e.g., with BRCA1/2, and the activation of the cell cycle regulatory enzymes ATM and ATR.2 PARP inhibitors as a single agent have only shown any degree of efficacy in breast and ovarian cancer patients who lack BRCA1/2 function.3,4 The present studies examined PARP1 inhibitor biology in a range of triple negative and non-triple negative breast cancer cell lines.
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Affiliation(s)
- Paul Dent
- Department of Neurosurgery; Massey Cancer Center; Virginia Commonwealth University; Richmond, VA USA
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