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Kanev PB, Varhoshkova S, Georgieva I, Lukarska M, Kirova D, Danovski G, Stoynov S, Aleksandrov R. A unified mechanism for PARP inhibitor-induced PARP1 chromatin retention at DNA damage sites in living cells. Cell Rep 2024; 43:114234. [PMID: 38758646 DOI: 10.1016/j.celrep.2024.114234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Revised: 03/20/2024] [Accepted: 04/26/2024] [Indexed: 05/19/2024] Open
Abstract
Poly(ADP-ribose) polymerase (PARP) inhibitors (PARPis) not only suppress PARP1 catalytic activity but also prolong its association to damaged chromatin. Here, through live-cell imaging, we quantify the alterations in PARP1 dynamics and activity elicited by seven PARPis over a wide range of concentrations to deliver a unified mechanism of PARPi-induced PARP1 chromatin retention. We find that gross PARP1 retention at DNA damage sites is jointly governed by catalytic inhibition and allosteric trapping, albeit in a strictly independent manner-catalytic inhibition causes multiple unproductive binding-dissociation cycles of PARP1, while allosteric trapping prolongs the lesion-bound state of PARP1 to greatly increase overall retention. Importantly, stronger PARP1 retention produces greater temporal shifts in downstream DNA repair events and superior cytotoxicity, highlighting PARP1 retention, a complex but precisely quantifiable characteristic of PARPis, as a valuable biomarker for PARPi efficacy. Our approach can be promptly repurposed for interrogating the properties of DNA-repair-targeting compounds beyond PARPis.
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Affiliation(s)
- Petar-Bogomil Kanev
- Laboratory of Genomic Stability, Institute of Molecular Biology, Bulgarian Academy of Sciences, Acad. G. Bonchev Str. Bl.21, 1113 Sofia, Bulgaria
| | - Sylvia Varhoshkova
- Laboratory of Genomic Stability, Institute of Molecular Biology, Bulgarian Academy of Sciences, Acad. G. Bonchev Str. Bl.21, 1113 Sofia, Bulgaria
| | - Irina Georgieva
- Transmembrane Signaling Laboratory, Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Str. Bl.21, 1113 Sofia, Bulgaria
| | - Maria Lukarska
- Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Dilyana Kirova
- Laboratory of Genomic Stability, Institute of Molecular Biology, Bulgarian Academy of Sciences, Acad. G. Bonchev Str. Bl.21, 1113 Sofia, Bulgaria
| | - Georgi Danovski
- Laboratory of Genomic Stability, Institute of Molecular Biology, Bulgarian Academy of Sciences, Acad. G. Bonchev Str. Bl.21, 1113 Sofia, Bulgaria
| | - Stoyno Stoynov
- Laboratory of Genomic Stability, Institute of Molecular Biology, Bulgarian Academy of Sciences, Acad. G. Bonchev Str. Bl.21, 1113 Sofia, Bulgaria.
| | - Radoslav Aleksandrov
- Laboratory of Genomic Stability, Institute of Molecular Biology, Bulgarian Academy of Sciences, Acad. G. Bonchev Str. Bl.21, 1113 Sofia, Bulgaria.
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2
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Suzuki T, Conant A, Jung Y, Bax R, Antonissen A, Chen W, Yu G, Ioffe YJ, Wang C, Unternaehrer JJ. A Stem-like Patient-Derived Ovarian Cancer Model of Platinum Resistance Reveals Dissociation of Stemness and Resistance. Int J Mol Sci 2024; 25:3843. [PMID: 38612653 PMCID: PMC11011340 DOI: 10.3390/ijms25073843] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2024] [Revised: 03/22/2024] [Accepted: 03/25/2024] [Indexed: 04/14/2024] Open
Abstract
To understand chemoresistance in the context of cancer stem cells (CSC), a cisplatin resistance model was developed using a high-grade serous ovarian cancer patient-derived, cisplatin-sensitive sample, PDX4. As a molecular subtype-specific stem-like cell line, PDX4 was selected for its representative features, including its histopathological and BRCA2 mutation status, and exposed to cisplatin in vitro. In the cisplatin-resistant cells, transcriptomics were carried out, and cell morphology, protein expression, and functional status were characterized. Additionally, potential signaling pathways involved in cisplatin resistance were explored. Our findings reveal the presence of distinct molecular signatures and phenotypic changes in cisplatin-resistant PDX4 compared to their sensitive counterparts. Surprisingly, we observed that chemoresistance was not inherently linked with increased stemness. In fact, although resistant cells expressed a combination of EMT and stemness markers, functional assays revealed that they were less proliferative, migratory, and clonogenic-features indicative of an underlying complex mechanism for cell survival. Furthermore, DNA damage tolerance and cellular stress management pathways were enriched. This novel, syngeneic model provides a valuable platform for investigating the underlying mechanisms of cisplatin resistance in a clinically relevant context, contributing to the development of targeted therapies tailored to combat resistance in stem-like ovarian cancer.
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Affiliation(s)
- Tise Suzuki
- Division of Biochemistry, Department of Basic Sciences, Loma Linda University, Loma Linda, CA 92354, USA
| | - Ashlyn Conant
- Division of Biochemistry, Department of Basic Sciences, Loma Linda University, Loma Linda, CA 92354, USA
| | - Yeonkyu Jung
- Division of Biochemistry, Department of Basic Sciences, Loma Linda University, Loma Linda, CA 92354, USA
- Department of Biology, California State University San Bernardino, San Bernardino, CA 92407, USA
| | - Ryan Bax
- Division of Biochemistry, Department of Basic Sciences, Loma Linda University, Loma Linda, CA 92354, USA
| | - Ashley Antonissen
- Division of Biochemistry, Department of Basic Sciences, Loma Linda University, Loma Linda, CA 92354, USA
- Department of Biology, California State University San Bernardino, San Bernardino, CA 92407, USA
| | - Wanqiu Chen
- Division of Biochemistry, Department of Basic Sciences, Loma Linda University, Loma Linda, CA 92354, USA
- Center for Genomics, Loma Linda University, Loma Linda, CA 92354, USA
| | - Gary Yu
- Department of Population and Family Health, Mailman School of Public Health, Columbia University, New York, NY 10032, USA
| | - Yevgeniya J Ioffe
- Division of Gynecologic Oncology, Department of Gynecology and Obstetrics, Loma Linda University Medical Center, Loma Linda, CA 92354, USA
| | - Charles Wang
- Division of Biochemistry, Department of Basic Sciences, Loma Linda University, Loma Linda, CA 92354, USA
- Center for Genomics, Loma Linda University, Loma Linda, CA 92354, USA
| | - Juli J Unternaehrer
- Division of Biochemistry, Department of Basic Sciences, Loma Linda University, Loma Linda, CA 92354, USA
- Division of Gynecologic Oncology, Department of Gynecology and Obstetrics, Loma Linda University Medical Center, Loma Linda, CA 92354, USA
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3
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Ertay A, Ewing RM, Wang Y. Synthetic lethal approaches to target cancers with loss of PTEN function. Genes Dis 2023; 10:2511-2527. [PMID: 37533462 PMCID: PMC7614861 DOI: 10.1016/j.gendis.2022.12.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2022] [Revised: 12/26/2022] [Accepted: 12/27/2022] [Indexed: 02/05/2023] Open
Abstract
Phosphatase and tensin homolog (PTEN) is a tumour suppressor gene and has a role in inhibiting the oncogenic AKT signalling pathway by dephosphorylating phosphatidylinositol 3,4,5-triphosphate (PIP3) into phosphatidylinositol 4,5-bisphosphate (PIP2). The function of PTEN is regulated by different mechanisms and inactive PTEN results in aggressive tumour phenotype and tumorigenesis. Identifying targeted therapies for inactive tumour suppressor genes such as PTEN has been challenging as it is difficult to restore the tumour suppressor functions. Therefore, focusing on the downstream signalling pathways to discover a targeted therapy for inactive tumour suppressor genes has highlighted the importance of synthetic lethality studies. This review focuses on the potential synthetic lethality genes discovered in PTEN-inactive cancer types. These discovered genes could be potential targeted therapies for PTEN-inactive cancer types and may improve the treatment response rates for aggressive types of cancer.
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Affiliation(s)
- Ayse Ertay
- Biological Sciences, Faculty of Environmental and Life Sciences, University of Southampton, Southampton SO17 1BJ, UK
| | - Rob M. Ewing
- Biological Sciences, Faculty of Environmental and Life Sciences, University of Southampton, Southampton SO17 1BJ, UK
- Institute for Life Sciences, University of Southampton, Southampton SO17 1BJ, UK
| | - Yihua Wang
- Biological Sciences, Faculty of Environmental and Life Sciences, University of Southampton, Southampton SO17 1BJ, UK
- Institute for Life Sciences, University of Southampton, Southampton SO17 1BJ, UK
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4
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Izumi T, Rychahou P, Chen L, Smith MH, Valentino J. Copy Number Variation That Influences the Ionizing Radiation Sensitivity of Oral Squamous Cell Carcinoma. Cells 2023; 12:2425. [PMID: 37887269 PMCID: PMC10605269 DOI: 10.3390/cells12202425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2023] [Revised: 09/28/2023] [Accepted: 10/05/2023] [Indexed: 10/28/2023] Open
Abstract
Genome instability in cancer cells causes not only point mutations but also structural variations of the genome, including copy number variations (CNVs). It has recently been proposed that CNVs arise in cancer to adapt to a given microenvironment to survive. However, how CNV influences cellular resistance against ionizing radiation remains unknown. PRMT5 (protein arginine methyltransferase 5) and APE1 (apurinic/apyrimidinic endonuclease 1), which enhance repair of DNA double-strand breaks and oxidative DNA damage, are closely localized in the chromosome 14 of the human genome. In this study, the genomics data for the PRMT5 and APE1 genes, including their expression, CNVs, and clinical outcomes, were analyzed using TCGA's data set for oral squamous cell carcinoma patients. The two genes were found to share almost identical CNV values among cancer tissues from oral squamous cell carcinoma (OSCC) patients. Levels of expression of PRMT5 and APE1 in OSCC tissues are highly correlated in cancer but not in normal tissues, suggesting that regulation of PRMT5 and APE1 were overridden by the extent of CNV in the PRMT5-APE1 genome region. High expression levels of PRMT5 and APE1 were both associated with poor survival outcomes after radiation therapy. Simultaneous down-regulation of PRMT5 and APE1 synergistically hampered DNA double-strand break repair and sensitized OSCC cell lines to X-ray irradiation in vitro and in vivo. These results suggest that the extent of CNV in a particular genome region significantly influence the radiation resistance of cancer cells. Profiling CNV in the PRMT5-APE1 genome region may help us to understand the mechanism of the acquired radioresistance of tumor cells, and raises the possibility that simultaneous inhibition of PRMT5 and APE1 may increase the efficacy of radiation therapy.
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Affiliation(s)
- Tadahide Izumi
- Department of Toxicology and Cancer Biology, University of Kentucky, Lexington, KY 40536, USA
- Markey Cancer Center, University of Kentucky, Lexington, KY 40536, USA
| | - Piotr Rychahou
- Markey Cancer Center, University of Kentucky, Lexington, KY 40536, USA
- Department of Surgery, University of Kentucky, Lexington, KY 40536, USA
| | - Li Chen
- Markey Cancer Center, University of Kentucky, Lexington, KY 40536, USA
- Internal Medicine, University of Kentucky, Lexington, KY 40536, USA
| | - Molly H. Smith
- Oral Pathology, University of Kentucky, Lexington, KY 40536, USA
- Pathology and Cytology Laboratory, University of Kentucky, Lexington, KY 40506, USA
| | - Joseph Valentino
- Markey Cancer Center, University of Kentucky, Lexington, KY 40536, USA
- Department of Otorhinolaryngology, University of Kentucky, Lexington, KY 40536, USA
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5
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Li J, Song C, Gu J, Li C, Zang W, Shi L, Chen L, Zhu L, Zhou M, Wang T, Li H, Qi S, Lu Y. RBBP4 regulates the expression of the Mre11-Rad50-NBS1 (MRN) complex and promotes DNA double-strand break repair to mediate glioblastoma chemoradiotherapy resistance. Cancer Lett 2023; 557:216078. [PMID: 36736531 DOI: 10.1016/j.canlet.2023.216078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Revised: 12/27/2022] [Accepted: 01/28/2023] [Indexed: 02/05/2023]
Abstract
For treatment of glioblastoma (GBM), temozolomide (TMZ) and radiotherapy (RT) exert antitumor effects by inducing DNA double-strand breaks (DSBs), mainly via futile DNA mismatch repair (MMR) and inducing apoptosis. Here, we provide evidence that RBBP4 modulates glioblastoma resistance to chemotherapy and radiotherapy by recruiting transcription factors and epigenetic regulators that bind to their promoters to regulate the expression of the Mre11-Rad50-NBS1(MRN) complex and the level of DNA-DSB repair, which are closely associated with recovery from TMZ- and radiotherapy-induced DNA damage in U87MG and LN229 glioblastoma cells, which have negative MGMT expression. Disruption of RBBP4 induced GBM cell DNA damage and apoptosis in response to TMZ and radiotherapy and enhanced radiotherapy and chemotherapy sensitivity by the independent pathway of MGMT. These results displayed a possible chemo-radioresistant mechanism in MGMT negative GBM. In addition, the RBBP4-MRN complex regulation axis may provide an interesting target for developing therapy-sensitizing strategies for GBM.
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Affiliation(s)
- Junjie Li
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, China; Nanfang Neurology Research Institution, Nanfang Hospital, Southern Medical University, Guangzhou, China; Nanfang Glioma Center, Guangzhou, China
| | - Chong Song
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, China; Department of Neurosurgery, The Central Hospital of Dalian University of Technology, Dalian, China
| | - Junwei Gu
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, China; The First People's Hospital of Xiushui County, Jiujiang, Jiangxi Province, China
| | - Chiyang Li
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Wenrui Zang
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Linyong Shi
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Lei Chen
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Liwen Zhu
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Min Zhou
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Tong Wang
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Hong Li
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, China; Nanfang Neurology Research Institution, Nanfang Hospital, Southern Medical University, Guangzhou, China; Nanfang Glioma Center, Guangzhou, China
| | - Songtao Qi
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, China; Nanfang Neurology Research Institution, Nanfang Hospital, Southern Medical University, Guangzhou, China; Nanfang Glioma Center, Guangzhou, China
| | - Yuntao Lu
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, China; Nanfang Neurology Research Institution, Nanfang Hospital, Southern Medical University, Guangzhou, China; Nanfang Glioma Center, Guangzhou, China.
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6
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Pre-Existing and Acquired Resistance to PARP Inhibitor-Induced Synthetic Lethality. Cancers (Basel) 2022; 14:cancers14235795. [PMID: 36497275 PMCID: PMC9741207 DOI: 10.3390/cancers14235795] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Revised: 11/17/2022] [Accepted: 11/21/2022] [Indexed: 11/27/2022] Open
Abstract
The advanced development of synthetic lethality has opened the doors for specific anti-cancer medications of personalized medicine and efficient therapies against cancers. One of the most popular approaches being investigated is targeting DNA repair pathways as the implementation of the PARP inhibitor (PARPi) into individual or combinational therapeutic schemes. Such treatment has been effectively employed against homologous recombination-defective solid tumors as well as hematopoietic malignancies. However, the resistance to PARPi has been observed in both preclinical research and clinical treatment. Therefore, elucidating the mechanisms responsible for the resistance to PARPi is pivotal for the further success of this intervention. Apart from mechanisms of acquired resistance, the bone marrow microenvironment provides a pre-existing mechanism to induce the inefficiency of PARPi in leukemic cells. Here, we describe the pre-existing and acquired mechanisms of the resistance to PARPi-induced synthetic lethality. We also discuss the potential rationales for developing effective therapies to prevent/repress the PARPi resistance in cancer cells.
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7
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Soni A, Lin X, Mladenov E, Mladenova V, Stuschke M, Iliakis G. BMN673 Is a PARP Inhibitor with Unique Radiosensitizing Properties: Mechanisms and Potential in Radiation Therapy. Cancers (Basel) 2022; 14:cancers14225619. [PMID: 36428712 PMCID: PMC9688666 DOI: 10.3390/cancers14225619] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Revised: 11/10/2022] [Accepted: 11/13/2022] [Indexed: 11/17/2022] Open
Abstract
BMN673 is a relatively new PARP inhibitor (PARPi) that exhibits superior efficacy in vitro compared to olaparib and other clinically relevant PARPi. BMN673, similar to most clinical PARPi, inhibits the catalytic activities of PARP-1 and PARP-2 and shows impressive anticancer potential as monotherapy in several pre-clinical and clinical studies. Tumor resistance to PARPi poses a significant challenge in the clinic. Thus, combining PARPi with other treatment modalities, such as radiotherapy (RT), is being actively pursued to overcome such resistance. However, the modest to intermediate radiosensitization exerted by olaparib, rucaparib, and veliparib, limits the rationale and the scope of such combinations. The recently reported strong radiosensitizing potential of BMN673 forecasts a paradigm shift on this front. Evidence accumulates that BMN673 may radiosensitize via unique mechanisms causing profound shifts in the balance among DNA double-strand break (DSB) repair pathways. According to one of the emerging models, BMN673 strongly inhibits classical non-homologous end-joining (c-NHEJ) and increases reciprocally and profoundly DSB end-resection, enhancing error-prone DSB processing that robustly potentiates cell killing. In this review, we outline and summarize the work that helped to formulate this model of BMN673 action on DSB repair, analyze the causes of radiosensitization and discuss its potential as a radiosensitizer in the clinic. Finally, we highlight strategies for combining BMN673 with other inhibitors of DNA damage response for further improvements.
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Affiliation(s)
- Aashish Soni
- Division of Experimental Radiation Biology, Department of Radiation Therapy, University Hospital Essen, University of Duisburg-Essen, 45147 Essen, Germany
- Institute of Medical Radiation Biology, University Hospital Essen, University of Duisburg-Essen, 45147 Essen, Germany
| | - Xixi Lin
- Division of Experimental Radiation Biology, Department of Radiation Therapy, University Hospital Essen, University of Duisburg-Essen, 45147 Essen, Germany
- Institute of Medical Radiation Biology, University Hospital Essen, University of Duisburg-Essen, 45147 Essen, Germany
| | - Emil Mladenov
- Division of Experimental Radiation Biology, Department of Radiation Therapy, University Hospital Essen, University of Duisburg-Essen, 45147 Essen, Germany
- Institute of Medical Radiation Biology, University Hospital Essen, University of Duisburg-Essen, 45147 Essen, Germany
| | - Veronika Mladenova
- Division of Experimental Radiation Biology, Department of Radiation Therapy, University Hospital Essen, University of Duisburg-Essen, 45147 Essen, Germany
- Institute of Medical Radiation Biology, University Hospital Essen, University of Duisburg-Essen, 45147 Essen, Germany
| | - Martin Stuschke
- Division of Experimental Radiation Biology, Department of Radiation Therapy, University Hospital Essen, University of Duisburg-Essen, 45147 Essen, Germany
- German Cancer Consortium (DKTK), Partner Site University Hospital Essen, German Cancer Research Center (DKFZ), 45147 Essen, Germany
| | - George Iliakis
- Division of Experimental Radiation Biology, Department of Radiation Therapy, University Hospital Essen, University of Duisburg-Essen, 45147 Essen, Germany
- Institute of Medical Radiation Biology, University Hospital Essen, University of Duisburg-Essen, 45147 Essen, Germany
- Correspondence: ; Tel.: +49-201-723-4152
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8
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PARP Inhibitors and Myeloid Neoplasms: A Double-Edged Sword. Cancers (Basel) 2021; 13:cancers13246385. [PMID: 34945003 PMCID: PMC8699275 DOI: 10.3390/cancers13246385] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2021] [Revised: 12/13/2021] [Accepted: 12/17/2021] [Indexed: 12/24/2022] Open
Abstract
Simple Summary Poly(ADP-ribose) polymerase (PARP) inhibitors, which are medications approved to treat various solid tumors, including breast, prostate, ovarian, and prostate cancers, are being examined in hematological malignancies. This review summarizes the potential role of PARP inhibitors in the treatment of myeloid diseases, particularly acute myeloid leukemia (AML). We review ongoing clinical studies investigating the safety and efficacy of PARP inhibitors in the treatment of AML, focusing on specific molecular and genetic AML subgroups that could be particularly sensitive to PARP inhibitor treatment. We also discuss reports describing an increased risk of treatment-related myeloid neoplasms in patients receiving PARP inhibitors for solid tumors. Abstract Despite recent discoveries and therapeutic advances in aggressive myeloid neoplasms, there remains a pressing need for improved therapies. For instance, in acute myeloid leukemia (AML), while most patients achieve a complete remission with conventional chemotherapy or the combination of a hypomethylating agent and venetoclax, de novo or acquired drug resistance often presents an insurmountable challenge, especially in older patients. Poly(ADP-ribose) polymerase (PARP) enzymes, PARP1 and PARP2, are involved in detecting DNA damage and repairing it through multiple pathways, including base excision repair, single-strand break repair, and double-strand break repair. In the context of AML, PARP inhibitors (PARPi) could potentially exploit the frequently dysfunctional DNA repair pathways that, similar to deficiencies in homologous recombination in BRCA-mutant disease, set the stage for cell killing. PARPi appear to be especially effective in AML with certain gene rearrangements and molecular characteristics (RUNX1-RUNX1T1 and PML-RARA fusions, FLT3- and IDH1-mutated). In addition, PARPi can enhance the efficacy of other agents, particularly alkylating agents, TOP1 poisons, and hypomethylating agents, that induce lesions ordinarily repaired via PARP1-dependent mechanisms. Conversely, emerging reports suggest that long-term treatment with PARPi for solid tumors is associated with an increased incidence of myelodysplastic syndrome (MDS) and AML. Here, we (i) review the pre-clinical and clinical data on the role of PARPi, specifically olaparib, talazoparib, and veliparib, in aggressive myeloid neoplasms and (ii) discuss the reported risk of MDS/AML with PARPi, especially as the indications for PARPi use expand to include patients with potentially curable cancer.
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9
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Spiegel JO, Van Houten B, Durrant JD. PARP1: Structural insights and pharmacological targets for inhibition. DNA Repair (Amst) 2021; 103:103125. [PMID: 33940558 PMCID: PMC8206044 DOI: 10.1016/j.dnarep.2021.103125] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Revised: 03/24/2021] [Accepted: 04/09/2021] [Indexed: 12/25/2022]
Abstract
Poly(ADP-ribose) polymerase 1 (PARP1, also known as ADPRT1) is a multifunctional human ADP-ribosyltransferase. It plays a role in multiple DNA repair pathways, including the base excision repair (BER), non-homologous end joining (NHEJ), homologous recombination (HR), and Okazaki-fragment processing pathways. In response to DNA strand breaks, PARP1 covalently attaches ADP-ribose moieties to arginine, glutamate, aspartate, cysteine, lysine, and serine acceptor sites on both itself and other proteins. This signal recruits DNA repair proteins to the site of DNA damage. PARP1 binding to these sites enhances ADP-ribosylation via allosteric communication between the distant DNA binding and catalytic domains. In this review, we provide a general overview of PARP1 and emphasize novel potential approaches for pharmacological inhibition. Clinical PARP1 inhibitors bind the catalytic pocket, where they directly interfere with ADP-ribosylation. Some inhibitors may further enhance potency by "trapping" PARP1 on DNA via an allosteric mechanism, though this proposed mode of action remains controversial. PARP1 inhibitors are used clinically to treat some cancers, but resistance is common, so novel pharmacological approaches are urgently needed. One approach may be to design novel small molecules that bind at inter-domain interfaces that are essential for PARP1 allostery. To illustrate these points, this review also includes instructive videos showing PARP1 structures and mechanisms.
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Affiliation(s)
- Jacob O Spiegel
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA, 15260, USA
| | - Bennett Van Houten
- UPMC-Hillman Cancer Center, Pittsburgh, PA, 15232, USA; Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA, 15213, USA
| | - Jacob D Durrant
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA, 15260, USA.
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10
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Mehibel M, Xu Y, Li CG, Moon EJ, Thakkar KN, Diep AN, Kim RK, Bloomstein JD, Xiao Y, Bacal J, Saldivar JC, Le QT, Cimprich KA, Rankin EB, Giaccia AJ. Eliminating hypoxic tumor cells improves response to PARP inhibitors in homologous recombination-deficient cancer models. J Clin Invest 2021; 131:146256. [PMID: 34060485 PMCID: PMC8266208 DOI: 10.1172/jci146256] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Accepted: 04/21/2021] [Indexed: 12/21/2022] Open
Abstract
Hypoxia, a hallmark feature of the tumor microenvironment, causes resistance to conventional chemotherapy, but was recently reported to synergize with poly(ADP-ribose) polymerase inhibitors (PARPis) in homologous recombination-proficient (HR-proficient) cells through suppression of HR. While this synergistic killing occurs under severe hypoxia (<0.5% oxygen), our study shows that moderate hypoxia (2% oxygen) instead promotes PARPi resistance in both HR-proficient and -deficient cancer cells. Mechanistically, we identify reduced ROS-induced DNA damage as the cause for the observed resistance. To determine the contribution of hypoxia to PARPi resistance in tumors, we used the hypoxic cytotoxin tirapazamine to selectively kill hypoxic tumor cells. We found that the selective elimination of hypoxic tumor cells led to a substantial antitumor response when used with PARPi compared with that in tumors treated with PARPi alone, without enhancing normal tissue toxicity. Since human breast cancers with BRAC1/2 mutations have an increased hypoxia signature and hypoxia reduces the efficacy of PARPi, then eliminating hypoxic tumor cells should enhance the efficacy of PARPi therapy.
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Affiliation(s)
- Manal Mehibel
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, Stanford University Medical Center, Stanford, California, USA
| | - Yu Xu
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, Stanford University Medical Center, Stanford, California, USA
| | - Caiyun G. Li
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, Stanford University Medical Center, Stanford, California, USA
| | - Eui Jung Moon
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, Stanford University Medical Center, Stanford, California, USA
| | - Kaushik N. Thakkar
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, Stanford University Medical Center, Stanford, California, USA
| | - Anh N. Diep
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, Stanford University Medical Center, Stanford, California, USA
| | - Ryan K. Kim
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, Stanford University Medical Center, Stanford, California, USA
| | - Joshua D. Bloomstein
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, Stanford University Medical Center, Stanford, California, USA
| | - Yiren Xiao
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, Stanford University Medical Center, Stanford, California, USA
| | - Julien Bacal
- Department of Chemical and Systems Biology, Stanford University School of Medicine, Stanford, California, USA
| | - Joshua C. Saldivar
- Department of Chemical and Systems Biology, Stanford University School of Medicine, Stanford, California, USA
| | - Quynh-Thu Le
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, Stanford University Medical Center, Stanford, California, USA
| | - Karlene A. Cimprich
- Department of Chemical and Systems Biology, Stanford University School of Medicine, Stanford, California, USA
| | - Erinn B. Rankin
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, Stanford University Medical Center, Stanford, California, USA
- Department of Obstetrics and Gynecology, Stanford University Medical Center, Stanford, California, USA
| | - Amato J. Giaccia
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, Stanford University Medical Center, Stanford, California, USA
- Oxford Institute for Radiation Oncology, University of Oxford, Oxford, United Kingdom
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Inhibition of DNA Repair in Combination with Temozolomide or Dianhydrogalactiol Overcomes Temozolomide-Resistant Glioma Cells. Cancers (Basel) 2021; 13:cancers13112570. [PMID: 34073837 PMCID: PMC8197190 DOI: 10.3390/cancers13112570] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Revised: 05/13/2021] [Accepted: 05/20/2021] [Indexed: 11/17/2022] Open
Abstract
Simple Summary Glioblastoma is the most prevalent and lethal brain tumor. Temozolomide is usually used for the treatment of glioblastoma. The poor prognosis of the tumor is due to drug resistance and tumor heterogeneity. The mechanism of the resistance to temozolomide is various within the same tumor. The aim of the study was to clarify the mechanism of temozolomide resistance and find methods to overcome temozolomide resistance in glioma. Inhibition of DNA repair (homologous recombination or base excision repair) resensitized resistant cells harboring different resistance mechanism to temozolomide. Additionally, a bifunctional DNA-targeting agent, dianhydrogalactiol, showed anti-tumor effect independent of MGMT and mismatch repair status. Further, inhibition of checkpoint or homologous recombination enhanced dianhydrogalactiol-induced cytotoxicity in temozolomide-resistant glioma cells. Although resistance to temozolomide is clinically important issue, selecting suitable treatments for resistance mechanism can improve the prognosis of glioma. Abstract Resistance to temozolomide and intratumoral heterogeneity contribute to the poor prognosis of glioma. The mechanisms of temozolomide resistance can vary within a heterogeneous tumor. Temozolomide adds a methyl group to DNA. The primary cytotoxic lesion, O6-methylguanine, mispairs with thymine, leading to a futile DNA mismatch repair cycle, formation of double-strand breaks, and eventual cell death when O6-methylguanine DNA methyltransferase (MGMT) is absent. N7-methylguanine and N3-methyladenine are repaired by base excision repair (BER). The study aim was to elucidate temozolomide resistance mechanisms and identify methods to overcome temozolomide resistance in glioma. Several temozolomide-resistant clones were analyzed. Increased homologous recombination and mismatch repair system deficiencies contributed to temozolomide resistance. Inhibition of homologous recombination resensitized resistant cells with high homologous recombination efficiency. For the mismatch repair-deficient cells, inhibition of BER by PARP inhibitor potentiated temozolomide-induced cytotoxicity. Dianhydrogalactiol is a bifunctional DNA-targeting agent that forms N7-alkylguanine and inter-strand DNA crosslinks. Dianhydrogalactiol reduced the proliferation of cells independent of MGMT and mismatch repair, inducing DNA double-strand breaks and apoptosis in temozolomide-resistant cells. Further, inhibition of chk1 or homologous recombination enhanced dianhydrogalactiol-induced cytotoxicity in the cells. Selecting treatments most appropriate to the types of resistance mechanisms can potentially improve the prognosis of glioma.
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The Role of PARP Inhibitors in the Treatment of Prostate Cancer: Recent Advances in Clinical Trials. Biomolecules 2021; 11:biom11050722. [PMID: 34066020 PMCID: PMC8150298 DOI: 10.3390/biom11050722] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Revised: 05/08/2021] [Accepted: 05/09/2021] [Indexed: 12/15/2022] Open
Abstract
Poly (adenosine diphosphate-ribose) polymerase inhibitors (PARPis) belong to a class of targeted drugs developed for the treatment of homologous recombination repair (HRR)-defective tumors. Preclinical and limited clinical data suggest that PARP inhibition is effective against prostate cancer (PC) in patients with HRR-deficient tumors and that PARPis can improve the mortality rate of PC in patients with BRCA1/2 mutations through a synthetic lethality. Olaparib has been approved by the FDA for advanced ovarian and breast cancer with BRCA mutations, and as a maintenance therapy for ovarian cancer after platinum chemotherapy. PARPis are also a new and emerging clinical treatment for metastatic castration-resistant prostate cancer (mCRPC). Although PARPis have shown great efficacy, their widespread use is restricted by various factors, including drug resistance and the limited population who benefit from treatment. It is necessary to study the combination of PARPis and other therapeutic agents such as anti-hormone drugs, USP7 inhibitors, BET inhibitors, and immunotherapy. This article reviews the mechanism of PARP inhibition in the treatment of PC, the progress of clinical research, the mechanisms of drug resistance, and the strategies of combination treatments.
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13
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Chang HR, Jung E, Cho S, Jeon YJ, Kim Y. Targeting Non-Oncogene Addiction for Cancer Therapy. Biomolecules 2021; 11:129. [PMID: 33498235 PMCID: PMC7909239 DOI: 10.3390/biom11020129] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2020] [Revised: 01/18/2021] [Accepted: 01/18/2021] [Indexed: 12/12/2022] Open
Abstract
While Next-Generation Sequencing (NGS) and technological advances have been useful in identifying genetic profiles of tumorigenesis, novel target proteins and various clinical biomarkers, cancer continues to be a major global health threat. DNA replication, DNA damage response (DDR) and repair, and cell cycle regulation continue to be essential systems in targeted cancer therapies. Although many genes involved in DDR are known to be tumor suppressor genes, cancer cells are often dependent and addicted to these genes, making them excellent therapeutic targets. In this review, genes implicated in DNA replication, DDR, DNA repair, cell cycle regulation are discussed with reference to peptide or small molecule inhibitors which may prove therapeutic in cancer patients. Additionally, the potential of utilizing novel synthetic lethal genes in these pathways is examined, providing possible new targets for future therapeutics. Specifically, we evaluate the potential of TONSL as a novel gene for targeted therapy. Although it is a scaffold protein with no known enzymatic activity, the strategy used for developing PCNA inhibitors can also be utilized to target TONSL. This review summarizes current knowledge on non-oncogene addiction, and the utilization of synthetic lethality for developing novel inhibitors targeting non-oncogenic addiction for cancer therapy.
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Affiliation(s)
- Hae Ryung Chang
- Department of Biological Sciences and Research Institute of Women’s Health, Sookmyung Women’s University, Seoul 04310, Korea; (E.J.); (S.C.)
| | - Eunyoung Jung
- Department of Biological Sciences and Research Institute of Women’s Health, Sookmyung Women’s University, Seoul 04310, Korea; (E.J.); (S.C.)
| | - Soobin Cho
- Department of Biological Sciences and Research Institute of Women’s Health, Sookmyung Women’s University, Seoul 04310, Korea; (E.J.); (S.C.)
| | - Young-Jun Jeon
- Department of Integrative Biotechnology, Sungkyunkwan University, Suwon 16419, Korea;
| | - Yonghwan Kim
- Department of Biological Sciences and Research Institute of Women’s Health, Sookmyung Women’s University, Seoul 04310, Korea; (E.J.); (S.C.)
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14
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Nickoloff JA, Taylor L, Sharma N, Kato TA. Exploiting DNA repair pathways for tumor sensitization, mitigation of resistance, and normal tissue protection in radiotherapy. CANCER DRUG RESISTANCE (ALHAMBRA, CALIF.) 2021; 4:244-263. [PMID: 34337349 PMCID: PMC8323830 DOI: 10.20517/cdr.2020.89] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
Abstract
More than half of cancer patients are treated with radiotherapy, which kills tumor cells by directly and indirectly inducing DNA damage, including cytotoxic DNA double-strand breaks (DSBs). Tumor cells respond to these threats by activating a complex signaling network termed the DNA damage response (DDR). The DDR arrests the cell cycle, upregulates DNA repair, and triggers apoptosis when damage is excessive. The DDR signaling and DNA repair pathways are fertile terrain for therapeutic intervention. This review highlights strategies to improve therapeutic gain by targeting DDR and DNA repair pathways to radiosensitize tumor cells, overcome intrinsic and acquired tumor radioresistance, and protect normal tissue. Many biological and environmental factors determine tumor and normal cell responses to ionizing radiation and genotoxic chemotherapeutics. These include cell type and cell cycle phase distribution; tissue/tumor microenvironment and oxygen levels; DNA damage load and quality; DNA repair capacity; and susceptibility to apoptosis or other active or passive cell death pathways. We provide an overview of radiobiological parameters associated with X-ray, proton, and carbon ion radiotherapy; DNA repair and DNA damage signaling pathways; and other factors that regulate tumor and normal cell responses to radiation. We then focus on recent studies exploiting DSB repair pathways to enhance radiotherapy therapeutic gain.
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Affiliation(s)
- Jac A. Nickoloff
- Department of Environmental and Radiological Health Sciences, Colorado State University, Ft. Collins, CO 80523, USA
- Correspondence Address: Dr. Jac A. Nickoloff, Department of Environmental and Radiological Health Sciences, Colorado State University, 1681 Campus Delivery, Ft. Collins, CO 80523-1681, USA. E-mail:
| | - Lynn Taylor
- Department of Environmental and Radiological Health Sciences, Colorado State University, Ft. Collins, CO 80523, USA
| | - Neelam Sharma
- Department of Environmental and Radiological Health Sciences, Colorado State University, Ft. Collins, CO 80523, USA
| | - Takamitsu A. Kato
- Department of Environmental and Radiological Health Sciences, Colorado State University, Ft. Collins, CO 80523, USA
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15
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Shao Z, Lee BJ, Rouleau-Turcotte É, Langelier MF, Lin X, Estes VM, Pascal JM, Zha S. Clinical PARP inhibitors do not abrogate PARP1 exchange at DNA damage sites in vivo. Nucleic Acids Res 2020; 48:9694-9709. [PMID: 32890402 PMCID: PMC7515702 DOI: 10.1093/nar/gkaa718] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Revised: 08/13/2020] [Accepted: 08/31/2020] [Indexed: 12/26/2022] Open
Abstract
DNA breaks recruit and activate PARP1/2, which deposit poly-ADP-ribose (PAR) to recruit XRCC1-Ligase3 and other repair factors to promote DNA repair. Clinical PARP inhibitors (PARPi) extend the lifetime of damage-induced PARP1/2 foci, referred to as ‘trapping’. To understand the molecular nature of ‘trapping’ in cells, we employed quantitative live-cell imaging and fluorescence recovery after photo-bleaching. Unexpectedly, we found that PARP1 exchanges rapidly at DNA damage sites even in the presence of clinical PARPi, suggesting the persistent foci are not caused by physical stalling. Loss of Xrcc1, a major downstream effector of PAR, also caused persistent PARP1 foci without affecting PARP1 exchange. Thus, we propose that the persistent PARP1 foci are formed by different PARP1 molecules that are continuously recruited to and exchanging at DNA lesions due to attenuated XRCC1-LIG3 recruitment and delayed DNA repair. Moreover, mutation analyses of the NAD+ interacting residues of PARP1 showed that PARP1 can be physically trapped at DNA damage sites, and identified H862 as a potential regulator for PARP1 exchange. PARP1-H862D, but not PARylation-deficient PARP1-E988K, formed stable PARP1 foci upon activation. Together, these findings uncovered the nature of persistent PARP1 foci and identified NAD+ interacting residues involved in the PARP1 exchange.
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Affiliation(s)
- Zhengping Shao
- Institute for Cancer Genetics, Department of Pathology and Cell Biology, College of Physicians and Surgeons, Columbia University, New York City, NY 10032, USA
| | - Brian J Lee
- Institute for Cancer Genetics, Department of Pathology and Cell Biology, College of Physicians and Surgeons, Columbia University, New York City, NY 10032, USA
| | - Élise Rouleau-Turcotte
- Université de Montréal, Biochemistry and Molecular Medicine, Montréal, Québec H3T 1J4, Canada
| | - Marie-France Langelier
- Université de Montréal, Biochemistry and Molecular Medicine, Montréal, Québec H3T 1J4, Canada
| | - Xiaohui Lin
- Institute for Cancer Genetics, Department of Pathology and Cell Biology, College of Physicians and Surgeons, Columbia University, New York City, NY 10032, USA
| | - Verna M Estes
- Institute for Cancer Genetics, Department of Pathology and Cell Biology, College of Physicians and Surgeons, Columbia University, New York City, NY 10032, USA
| | - John M Pascal
- Université de Montréal, Biochemistry and Molecular Medicine, Montréal, Québec H3T 1J4, Canada
| | - Shan Zha
- Institute for Cancer Genetics, Department of Pathology and Cell Biology, College of Physicians and Surgeons, Columbia University, New York City, NY 10032, USA.,Division of Pediatric Oncology, Hematology and Stem Cell Transplantation, Department of Pediatrics, College of Physicians & Surgeons, Columbia University, New York City, NY 10032, USA
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16
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Li H, Liu ZY, Wu N, Chen YC, Cheng Q, Wang J. PARP inhibitor resistance: the underlying mechanisms and clinical implications. Mol Cancer 2020; 19:107. [PMID: 32563252 PMCID: PMC7305609 DOI: 10.1186/s12943-020-01227-0] [Citation(s) in RCA: 204] [Impact Index Per Article: 51.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Accepted: 06/11/2020] [Indexed: 12/31/2022] Open
Abstract
Due to the DNA repair defect, BRCA1/2 deficient tumor cells are more sensitive to PARP inhibitors (PARPi) through the mechanism of synthetic lethality. At present, several PAPRi targeting poly (ADP-ribose) polymerase (PARP) have been approved for ovarian cancer and breast cancer indications. However, PARPi resistance is ubiquitous in clinic. More than 40% BRCA1/2-deficient patients fail to respond to PARPi. In addition, lots of patients acquire PARPi resistance with prolonged oral administration of PARPi. Homologous recombination repair deficient (HRD), as an essential prerequisite of synthetic lethality, plays a vital role in killing tumor cells. Therefore, Homologous recombination repair restoration (HRR) becomes the predominant reason of PARPi resistance. Recently, it was reported that DNA replication fork protection also contributed to PARPi resistance in BRCA1/2-deficient cells and patients. Moreover, various factors, such as reversion mutations, epigenetic modification, restoration of ADP-ribosylation (PARylation) and pharmacological alteration lead to PARPi resistance as well. In this review, we reviewed the underlying mechanisms of PARP inhibitor resistance in detail and summarized the potential strategies to overcome PARPi resistance and increase PARPi sensitivity.
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Affiliation(s)
- He Li
- Hunan Clinical Research Center in Gynecologic Cancer, Hunan Cancer Hospital and The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, 283, Tongzipo Road, Changsha, 410013, Hunan, People's Republic of China
| | - Zhao-Yi Liu
- Hunan Clinical Research Center in Gynecologic Cancer, Hunan Cancer Hospital and The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, 283, Tongzipo Road, Changsha, 410013, Hunan, People's Republic of China
| | - Nayiyuan Wu
- Hunan Clinical Research Center in Gynecologic Cancer, Hunan Cancer Hospital and The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, 283, Tongzipo Road, Changsha, 410013, Hunan, People's Republic of China
| | - Yong-Chang Chen
- Hunan Clinical Research Center in Gynecologic Cancer, Hunan Cancer Hospital and The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, 283, Tongzipo Road, Changsha, 410013, Hunan, People's Republic of China
| | - Quan Cheng
- Department of Neurosurgery, Xiangya Hospital, Central South University, Changsha, 410013, Hunan, People's Republic of China
| | - Jing Wang
- Hunan Clinical Research Center in Gynecologic Cancer, Hunan Cancer Hospital and The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, 283, Tongzipo Road, Changsha, 410013, Hunan, People's Republic of China. .,Department of Gynecologic Cancer, Hunan Cancer Hospital and The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, 283, Tongzipo Road, Changsha, 410013, Hunan, People's Republic of China.
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17
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Gralewska P, Gajek A, Marczak A, Rogalska A. Participation of the ATR/CHK1 pathway in replicative stress targeted therapy of high-grade ovarian cancer. J Hematol Oncol 2020; 13:39. [PMID: 32316968 PMCID: PMC7175546 DOI: 10.1186/s13045-020-00874-6] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Accepted: 04/08/2020] [Indexed: 12/15/2022] Open
Abstract
Ovarian cancer is one of the most lethal gynecologic malignancies reported throughout the world. The initial, standard-of-care, adjuvant chemotherapy in epithelial ovarian cancer is usually a platinum drug, such as cisplatin or carboplatin, combined with a taxane. However, despite surgical removal of the tumor and initial high response rates to first-line chemotherapy, around 80% of women will develop cancer recurrence. Effective strategies, including chemotherapy and new research models, are necessary to improve the prognosis. The replication stress response (RSR) is characteristic of the development of tumors, including ovarian cancer. Hence, RSR pathway and DNA repair proteins have emerged as a new area for anticancer drug development. Although clinical trials have shown poly (ADP-ribose) polymerase inhibitors (PARPi) response rates of around 40% in women who carry a mutation in the BRCA1/2 genes, PARPi is responsible for tumor suppression, but not for complete tumor regression. Recent reports suggest that cells with impaired homologous recombination (HR) activities due to mutations in TP53 gene or specific DNA repair proteins are specifically sensitive to ataxia telangiectasia and Rad3-related protein (ATR) inhibitors. Replication stress activates DNA repair checkpoint proteins (ATR, CHK1), which prevent further DNA damage. This review describes the use of DNA repair checkpoint inhibitors as single agents and strategies combining these inhibitors with DNA-damaging compounds for ovarian cancer therapy, as well as the new platforms used for optimizing ovarian cancer therapy.
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Affiliation(s)
- Patrycja Gralewska
- Department of Medical Biophysics, Faculty of Biology and Environmental Protection, Institute of Biophysics, University of Lodz, Pomorska 141/143, 90-236, Lodz, Poland
| | - Arkadiusz Gajek
- Department of Medical Biophysics, Faculty of Biology and Environmental Protection, Institute of Biophysics, University of Lodz, Pomorska 141/143, 90-236, Lodz, Poland
| | - Agnieszka Marczak
- Department of Medical Biophysics, Faculty of Biology and Environmental Protection, Institute of Biophysics, University of Lodz, Pomorska 141/143, 90-236, Lodz, Poland
| | - Aneta Rogalska
- Department of Medical Biophysics, Faculty of Biology and Environmental Protection, Institute of Biophysics, University of Lodz, Pomorska 141/143, 90-236, Lodz, Poland.
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18
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Rankin EB. Genomics and molecular mechanisms of high grade serous ovarian cancer: the 12th Biennial Rivkin Center Ovarian Cancer Research Symposium. Int J Gynecol Cancer 2020; 29:s7-s11. [PMID: 31462542 DOI: 10.1136/ijgc-2019-000490] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Revised: 06/19/2019] [Accepted: 06/21/2019] [Indexed: 11/04/2022] Open
Abstract
OBJECTIVE The aim of this study was to review current research efforts in genomics and molecular mechanisms of high grade serous ovarian cancer, presented at the 12th Biennial Rivkin Center Ovarian Cancer Research Symposium, held at the University of Washington. METHODS The 12th Biennial Rivkin Center Ovarian Cancer Research Symposium brought together leaders in the field to discuss recent advances in ovarian cancer research and therapy. RESULTS The genomics and molecular mechanisms of ovarian cancer session featured invited speaker presentations by Dr Alan D' Andrea on 'Deoxyribonucleic acid (DNA) repair in ovarian cancer' and Dr Kathleen Cho on 'Modeling the genomics of high grade serous carcinoma in the mouse'. Eight additional oral presentations and 46 poster presentations were selected from the submitted abstracts that highlighted current research efforts in p53, DNA repair, genomic instability and modeling disease in mice, and organoids in high grade serous ovarian cancer. CONCLUSIONS New technologies utilizing clustered regularly interspaced short palindromic repeats (CRISPR)/CRISPR associated protein 9 (CAS9) approaches in mice, organoids, and cell based screens continue to advance our knowledge of key molecular drivers of ovarian cancer initiation, progression, and drug resistance. Improved understanding of the mechanisms of poly ADP ribose polymerase inhibitor resistance may lead to new therapeutic strategies to enhance outcomes in women with high grade serous ovarian cancer.
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Affiliation(s)
- Erinn B Rankin
- Radiation Oncology and Obstetrics and Gynecology, Stanford University, Stanford, California, USA
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19
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Schoonen PM, Kok YP, Wierenga E, Bakker B, Foijer F, Spierings DCJ, van Vugt MATM. Premature mitotic entry induced by ATR inhibition potentiates olaparib inhibition-mediated genomic instability, inflammatory signaling, and cytotoxicity in BRCA2-deficient cancer cells. Mol Oncol 2019; 13:2422-2440. [PMID: 31529615 PMCID: PMC6822251 DOI: 10.1002/1878-0261.12573] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2019] [Revised: 07/22/2019] [Accepted: 09/12/2019] [Indexed: 12/26/2022] Open
Abstract
Poly(ADP‐ribose) polymerase (PARP) inhibitors are selectively cytotoxic in cancer cells with defects in homologous recombination (HR) (e.g., due to BRCA1/2 mutations). However, not all HR‐deficient tumors efficiently respond to PARP inhibition and often acquire resistance. It is therefore important to uncover how PARP inhibitors induce cytotoxicity and develop combination strategies to potentiate PARP inhibitor efficacy in HR‐deficient tumors. In this study, we found that forced mitotic entry upon ATR inhibition potentiates cytotoxic effects of PARP inhibition using olaparib in BRCA2‐depleted and Brca2 knockout cancer cell line models. Single DNA fiber analysis showed that ATR inhibition does not exacerbate replication fork degradation. Instead, we find ATR inhibitors accelerate mitotic entry, resulting in the formation of chromatin bridges and lagging chromosomes. Furthermore, using genome‐wide single‐cell sequencing, we show that ATR inhibition enhances genomic instability of olaparib‐treated BRCA2‐depleted cells. Inhibition of CDK1 to delay mitotic entry mitigated mitotic aberrancies and genomic instability upon ATR inhibition, underscoring the role of ATR in coordinating proper cell cycle timing in situations of DNA damage. Additionally, we show that olaparib treatment leads to increased numbers of micronuclei, which is accompanied by a cGAS/STING‐associated inflammatory response in BRCA2‐deficient cells. ATR inhibition further increased the numbers of cGAS‐positive micronuclei and the extent of cytokine production in olaparib‐treated BRCA2‐deficient cancer cells. Altogether, we show that ATR inhibition induces premature mitotic entry and mediates synergistic cytotoxicity with PARP inhibition in HR‐deficient cancer cells, which involves enhanced genomic instability and inflammatory signaling.
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Affiliation(s)
- Pepijn M Schoonen
- Department of Medical Oncology, University Medical Center Groningen, University of Groningen, The Netherlands
| | - Yannick P Kok
- Department of Medical Oncology, University Medical Center Groningen, University of Groningen, The Netherlands
| | - Elles Wierenga
- Department of Medical Oncology, University Medical Center Groningen, University of Groningen, The Netherlands
| | - Bjorn Bakker
- European Institute for the Biology of Ageing (ERIBA), University Medical Center Groningen, University of Groningen, The Netherlands
| | - Floris Foijer
- European Institute for the Biology of Ageing (ERIBA), University Medical Center Groningen, University of Groningen, The Netherlands
| | - Diana C J Spierings
- European Institute for the Biology of Ageing (ERIBA), University Medical Center Groningen, University of Groningen, The Netherlands
| | - Marcel A T M van Vugt
- Department of Medical Oncology, University Medical Center Groningen, University of Groningen, The Netherlands
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20
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Genome-scale CRISPR knockout screen identifies TIGAR as a modifier of PARP inhibitor sensitivity. Commun Biol 2019; 2:335. [PMID: 31508509 PMCID: PMC6733792 DOI: 10.1038/s42003-019-0580-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Accepted: 08/14/2019] [Indexed: 12/14/2022] Open
Abstract
Treatment of cancer with poly (ADP-ribose) polymerase (PARP) inhibitors is currently limited to cells defective in the homologous recombination (HR) pathway. Identification of genetic targets that induce or mimic HR deficiencies will extend the clinical utility of PARP inhibitors. Here we perform a CRISPR/Cas9-based genome-scale loss-of-function screen, using the sensitivity of PARP inhibitor olaparib as a surrogate. We identify C12orf5, encoding TP53 induced glycolysis and apoptosis regulator (TIGAR), as a modifier of PARP inhibitor response. We show that TIGAR is amplified in several cancer types, and higher expression of TIGAR associates with poor overall survival in ovarian cancer. TIGAR knockdown enhances sensitivity to olaparib in cancer cells via downregulation of BRCA1 and the Fanconi anemia pathway and increases senescence of these cells by affecting metabolic pathways and increasing the cytotoxic effects of olaparib. Our results indicate TIGAR should be explored as a therapeutic target for treating cancer and extending the use of PARP inhibitors. Pingping Fang et al. report a CRISPR/Cas9-based genome-scale loss-of-function screen identifying TIGAR as a modifier of response to PARP inhibition. The authors find that knockdown of TIGAR increases intracellular reactive oxygen species levels, enhances more DNA damage after olaparib treatment, and induces a state of “BRCAness”, suggesting that TIGAR is a potential therapeutic target in ovarian cancer patients.
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21
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Sargazi S, Saravani R, Zavar Reza J, Jaliani HZ, Mirinejad S, Rezaei Z, Zarei S. Induction of apoptosis and modulation of homologous recombination DNA repair pathway in prostate cancer cells by the combination of AZD2461 and valproic acid. EXCLI JOURNAL 2019; 18:485-498. [PMID: 31423128 PMCID: PMC6694702 DOI: 10.17179/excli2019-1098] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Accepted: 07/01/2019] [Indexed: 01/01/2023]
Abstract
Cancer therapies using defects in homologous recombination (HR) DNA repair pathway of tumor cells are not yet approved to be applicable in patients with malignancies other than BRCA1/2-mutated tumors. This study was designed to determine the efficacy of combination therapy of a histone deacetylase inhibitor, valproic acid (VPA) and a novel PARP inhibitor AZD2461 in both PC-3 (PTEN-mutated) and DU145 (PTEN-unmutated) prostate cancer cell lines. The Trypan blue dye exclusion assay and the tetrazolium-based colorimetric (MTT) assay were performed to measure the cytotoxicity while combination effects were assessed based on Chou-Talalay's principles. Flow-cytometric assay determined the type of cell death. The real-time PCR analysis was used to evaluate the alterations in mRNA levels of HR-related genes while their protein levels were measured using the ELISA method. γ-H2AX levels were determined as a marker of DNA damage. We observed a synergistic relationship between VPA and AZD2461 in all affected fractions of PC-3 cells (CI<0.9), but not in DU145 cells (CI>1.1). Annexin-V staining analysis revealed a significant induction of apoptosis when PC-3 cells were treated with VPA+AZD2461 (p<0.05). Both mRNA and protein levels of Rad51 and Mre11 were significantly decreased in PC-3 cells co-treated with VPA+AZD2461 while enhanced H2AX phosphorylation was found in PC-3 cells after 12 and 24 hours of co-treatment (p<0.05). Our findings established a preclinical rationale for selective targeting of HR repair pathways by a combination of VPA and AZD2461 as a mechanism for reducing the HR pathway sufficiency in PTEN-mutated prostate cancer cells.
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Affiliation(s)
- Saman Sargazi
- Cellular and Molecular Research Center, Zahedan University of Medical Sciences, Zahedan, Iran.,Department of Clinical Biochemistry, School of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Ramin Saravani
- Cellular and Molecular Research Center, Zahedan University of Medical Sciences, Zahedan, Iran.,Department of Clinical Biochemistry, School of Medicine, Zahedan University of Medical Sciences, Zahedan, Iran
| | - Javad Zavar Reza
- Department of Clinical Biochemistry, School of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Hossein Zarei Jaliani
- Protein Engineering Laboratory, Department of Medical Genetics, School of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Shekoufeh Mirinejad
- Cellular and Molecular Research Center, Zahedan University of Medical Sciences, Zahedan, Iran
| | - Zohreh Rezaei
- Department of Biology, University of Sistan and Baluchestan, Zahedan, Iran
| | - Sadegh Zarei
- Department of Clinical Biochemistry, School of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
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Przybycinski J, Nalewajska M, Marchelek-Mysliwiec M, Dziedziejko V, Pawlik A. Poly-ADP-ribose polymerases (PARPs) as a therapeutic target in the treatment of selected cancers. Expert Opin Ther Targets 2019; 23:773-785. [PMID: 31394942 DOI: 10.1080/14728222.2019.1654458] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Introduction: The implementation of poly-ADP-ribose polymerase (PARP) inhibitors for therapy has created potential treatments for a wide spectrum of malignancies involving DNA damage repair gene abnormalities. PARPs are a group of enzymes that are responsible for detecting and repairing DNA damage and therefore play a key role in maintaining cell function and integrity. PARP inhibitors are drugs that target DNA repair deficiencies. Inhibiting PARP activity in cancer cells causes cell death. Areas covered: This review summarizes the role of PARP inhibitors in the treatment of cancer. We performed a systematic literature search in February 2019 in the electronic databases PubMed and EMBASE. Our search terms were the following: PARP, PARP inhibitors, PARPi, Poly ADP ribose polymerase, cancer treatment. We discuss PARP inhibitors currently being investigated in cancer clinical trials, their safety profiles, clinical resistance, combined therapeutic approaches and future challenges. Expert Opinion: The future could bring novel PARP inhibitors with greater DNA trapping potential, better safety profiles and improved combined therapies involving hormonal, chemo-, radio- or immunotherapies. Progress may afford wider indications for PARP inhibitors in the treatment of cancer and the utilization for cancer prevention in high-risk mutation carriers. Research efforts should focus on identifying novel drugs that target DNA repair deficiencies.
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Affiliation(s)
- Jarosław Przybycinski
- Department of Nephrology, Transplantology and Internal Medicine, Pomeranian Medical University , Szczecin , Poland
| | - Magdalena Nalewajska
- Department of Nephrology, Transplantology and Internal Medicine, Pomeranian Medical University , Szczecin , Poland
| | | | - Violetta Dziedziejko
- Department of Biochemistry and Medical Chemistry, Pomeranian Medical University , Szczecin , Poland
| | - Andrzej Pawlik
- Department of Physiology, Pomeranian Medical University , Szczecin , Poland
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Jiang X, Li X, Li W, Bai H, Zhang Z. PARP inhibitors in ovarian cancer: Sensitivity prediction and resistance mechanisms. J Cell Mol Med 2019; 23:2303-2313. [PMID: 30672100 PMCID: PMC6433712 DOI: 10.1111/jcmm.14133] [Citation(s) in RCA: 90] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Revised: 10/22/2018] [Accepted: 12/12/2018] [Indexed: 12/25/2022] Open
Abstract
Poly (ADP‐ribose) polymerase (PARP) inhibitors have provided great clinical benefits to ovarian cancer patients. To date, three PARP inhibitors, namely, olaparib, rucaparib and niraparib have been approved for the treatment of ovarian cancer in the United States. Homologous recombination deficiency (HRD) and platinum sensitivity are prospective biomarkers for predicting the response to PARP inhibitors in ovarian cancers. Preclinical data have focused on identifying the gene aberrations that might generate HRD and induce sensitivity to PARP inhibitors in vitro in cancer cell lines or in vivo in patient‐derived xenografts. Clinical trials have focused on genomic scar analysis to identify biomarkers for predicting the response to PARP inhibitors. Additionally, researchers have aimed to investigate mechanisms of resistance to PARP inhibitors and strategies to overcome this resistance. Combining PARP inhibitors with HR pathway inhibitors to extend the utility of PARP inhibitors to BRCA‐proficient tumours is increasingly foreseeable. Identifying the population of patients with the greatest potential benefit from PARP inhibitor therapy and the circumstances under which patients are no longer suited for PARP inhibitor therapy are important. Further studies are required in order to propose better strategies for overcoming resistance to PARP inhibitor therapy in ovarian cancers.
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Affiliation(s)
- Xuan Jiang
- Department of Obstetrics and Gynecology, Beijing Chao-yang Hospital, Capital Medical University, Beijing, China
| | - Xiaoying Li
- Department of Obstetrics and Gynecology, Beijing Chao-yang Hospital, Capital Medical University, Beijing, China
| | - Weihua Li
- Department of Obstetrics and Gynecology, Beijing Chao-yang Hospital, Capital Medical University, Beijing, China
| | - Huimin Bai
- Department of Obstetrics and Gynecology, Beijing Chao-yang Hospital, Capital Medical University, Beijing, China
| | - Zhenyu Zhang
- Department of Obstetrics and Gynecology, Beijing Chao-yang Hospital, Capital Medical University, Beijing, China
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Hypoxia-mediated mitochondria apoptosis inhibition induces temozolomide treatment resistance through miR-26a/Bad/Bax axis. Cell Death Dis 2018; 9:1128. [PMID: 30425242 PMCID: PMC6233226 DOI: 10.1038/s41419-018-1176-7] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Revised: 09/11/2018] [Accepted: 10/18/2018] [Indexed: 01/28/2023]
Abstract
Glioblastoma multiforme (GBM) is one of the most hypoxic tumors of the central nervous system. Although temozolomide (TMZ) is an effective clinical agent in the GBM therapy, the hypoxic microenvironment remains a major barrier in glioma chemotherapy resistance, and the underlying mechanisms are poorly understood. Here, we find hypoxia can induce the protective response to mitochondrion via HIF-1α-mediated miR-26a upregulation which is associated with TMZ resistance in vitro and in vivo. Further, we demonstrated that HIF-1α/miR-26a axis strengthened the acquisition of TMZ resistance through prevention of Bax and Bad in mitochondria dysfunction in GBM. In addition, miR-26a expression levels negatively correlate with Bax, Bad levels, and GBM progression; but highly correlate with HIF-1α levels in clinical cancer tissues. These findings provide a new link in the mechanistic understanding of TMZ resistance under glioma hypoxia microenvironment, and consequently HIF-1α/miR-26a/Bax/Bad signaling pathway as a promising adjuvant therapy for GBM with TMZ.
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Lallo A, Frese KK, Morrow CJ, Sloane R, Gulati S, Schenk MW, Trapani F, Simms N, Galvin M, Brown S, Hodgkinson CL, Priest L, Hughes A, Lai Z, Cadogan E, Khandelwal G, Simpson KL, Miller C, Blackhall F, O'Connor MJ, Dive C. The Combination of the PARP Inhibitor Olaparib and the WEE1 Inhibitor AZD1775 as a New Therapeutic Option for Small Cell Lung Cancer. Clin Cancer Res 2018; 24:5153-5164. [PMID: 29941481 DOI: 10.1158/1078-0432.ccr-17-2805] [Citation(s) in RCA: 114] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2017] [Revised: 04/05/2018] [Accepted: 06/20/2018] [Indexed: 12/12/2022]
Abstract
Purpose: Introduced in 1987, platinum-based chemotherapy remains standard of care for small cell lung cancer (SCLC), a most aggressive, recalcitrant tumor. Prominent barriers to progress are paucity of tumor tissue to identify drug targets and patient-relevant models to interrogate novel therapies. Following our development of circulating tumor cell patient-derived explants (CDX) as models that faithfully mirror patient disease, here we exploit CDX to examine new therapeutic options for SCLC.Experimental Design: We investigated the efficacy of the PARP inhibitor olaparib alone or in combination with the WEE1 kinase inhibitor AZD1775 in 10 phenotypically distinct SCLC CDX in vivo and/or ex vivo These CDX represent chemosensitive and chemorefractory disease including the first reported paired CDX generated longitudinally before treatment and upon disease progression.Results: There was a heterogeneous depth and duration of response to olaparib/AZD1775 that diminished when tested at disease progression. However, efficacy of this combination consistently exceeded that of cisplatin/etoposide, with cures in one CDX model. Genomic and protein analyses revealed defects in homologous recombination repair genes and oncogenes that induce replication stress (such as MYC family members), predisposed CDX to combined olaparib/AZD1775 sensitivity, although universal predictors of response were not noted.Conclusions: These preclinical data provide a strong rationale to trial this combination in the clinic informed by prevalent, readily accessed circulating tumor cell-based biomarkers. New therapies will be evaluated in SCLC patients after first-line chemotherapy, and our data suggest that the combination of olaparib/AZD1775 should be used as early as possible and before disease relapse. Clin Cancer Res; 24(20); 5153-64. ©2018 AACR.
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Affiliation(s)
- Alice Lallo
- Clinical and Experimental Pharmacology Group, Cancer Research UK Manchester Institute, University of Manchester, Manchester, United Kingdom
| | - Kristopher K Frese
- Clinical and Experimental Pharmacology Group, Cancer Research UK Manchester Institute, University of Manchester, Manchester, United Kingdom
| | - Christopher J Morrow
- Clinical and Experimental Pharmacology Group, Cancer Research UK Manchester Institute, University of Manchester, Manchester, United Kingdom
| | - Robert Sloane
- Clinical and Experimental Pharmacology Group, Cancer Research UK Manchester Institute, University of Manchester, Manchester, United Kingdom
| | - Sakshi Gulati
- Clinical and Experimental Pharmacology Group, Cancer Research UK Manchester Institute, University of Manchester, Manchester, United Kingdom
| | - Maximillian W Schenk
- Clinical and Experimental Pharmacology Group, Cancer Research UK Manchester Institute, University of Manchester, Manchester, United Kingdom
| | - Francesca Trapani
- Clinical and Experimental Pharmacology Group, Cancer Research UK Manchester Institute, University of Manchester, Manchester, United Kingdom
| | - Nicole Simms
- Clinical and Experimental Pharmacology Group, Cancer Research UK Manchester Institute, University of Manchester, Manchester, United Kingdom
| | - Melanie Galvin
- Clinical and Experimental Pharmacology Group, Cancer Research UK Manchester Institute, University of Manchester, Manchester, United Kingdom
| | - Stewart Brown
- Clinical and Experimental Pharmacology Group, Cancer Research UK Manchester Institute, University of Manchester, Manchester, United Kingdom
| | - Cassandra L Hodgkinson
- Clinical and Experimental Pharmacology Group, Cancer Research UK Manchester Institute, University of Manchester, Manchester, United Kingdom
| | - Lynsey Priest
- Clinical and Experimental Pharmacology Group, Cancer Research UK Manchester Institute, University of Manchester, Manchester, United Kingdom
| | - Adina Hughes
- Oncology Innovative Medicines and Early Development Biotech Unit, AstraZeneca, Cambridge, United Kingdom
| | - Zhongwu Lai
- Oncology Innovative Medicines and Early Development Biotech Unit, AstraZeneca, Waltham, Massachusetts
| | - Elaine Cadogan
- Oncology Innovative Medicines and Early Development Biotech Unit, AstraZeneca, Cambridge, United Kingdom
| | - Garima Khandelwal
- RNA Biology Group, Cancer Research UK Manchester Institute, University of Manchester, Manchester, United Kingdom
| | - Kathryn L Simpson
- Clinical and Experimental Pharmacology Group, Cancer Research UK Manchester Institute, University of Manchester, Manchester, United Kingdom
| | - Crispin Miller
- RNA Biology Group, Cancer Research UK Manchester Institute, University of Manchester, Manchester, United Kingdom
| | - Fiona Blackhall
- Institute of Cancer Sciences, University of Manchester, and Christie NHS Foundation Trust, Manchester, United Kingdom
| | - Mark J O'Connor
- Oncology Innovative Medicines and Early Development Biotech Unit, AstraZeneca, Cambridge, United Kingdom.
| | - Caroline Dive
- Clinical and Experimental Pharmacology Group, Cancer Research UK Manchester Institute, University of Manchester, Manchester, United Kingdom.
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The multifunctional protein YB-1 potentiates PARP1 activity and decreases the efficiency of PARP1 inhibitors. Oncotarget 2018; 9:23349-23365. [PMID: 29805738 PMCID: PMC5955111 DOI: 10.18632/oncotarget.25158] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2017] [Accepted: 04/02/2018] [Indexed: 02/06/2023] Open
Abstract
Y-box-binding protein 1 (YB-1) is a multifunctional cellular factor overexpressed in tumors resistant to chemotherapy. An intrinsically disordered structure together with a high positive charge peculiar to YB-1 allows this protein to function in almost all cellular events related to nucleic acids including RNA, DNA and poly(ADP-ribose) (PAR). In the present study we show that YB-1 acts as a potent poly(ADP-ribose) polymerase 1 (PARP1) cofactor that can reduce the efficiency of PARP1 inhibitors. Similarly to that of histones or polyamines, stimulatory effect of YB-1 on the activity of PARP1 was significantly higher than the activator potential of Mg2+ and was independent of the presence of EDTA. The C-terminal domain of YB-1 proved to be indispensable for PARP1 stimulation. We also found that functional interactions of YB-1 and PARP1 can be mediated and regulated by poly(ADP-ribose).
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Pishvaian MJ, Slack RS, Jiang W, He AR, Hwang JJ, Hankin A, Dorsch-Vogel K, Kukadiya D, Weiner LM, Marshall JL, Brody JR. A phase 2 study of the PARP inhibitor veliparib plus temozolomide in patients with heavily pretreated metastatic colorectal cancer. Cancer 2018; 124:2337-2346. [PMID: 29579325 DOI: 10.1002/cncr.31309] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Revised: 12/23/2017] [Accepted: 01/18/2018] [Indexed: 12/14/2022]
Abstract
BACKGROUND Poly(adenosine diphosphate ribose) polymerase (PARP) inhibitors such as veliparib are potent sensitizing agents and have been safely combined with DNA-damaging agents such as temozolomide. The sensitizing effects of PARP inhibitors are magnified when cells harbor DNA repair defects. METHODS A single-arm, open-label, phase 2 study was performed to investigate the disease control rate (DCR) after 2 cycles of veliparib plus temozolomide in patients with metastatic colorectal cancer (mCRC) refractory to all standard therapies. Fifty patients received temozolomide (150 mg/m2 /d) on days 1 to 5 and veliparib (40 mg twice daily) on days 1 to 7 of each 28-day cycle. Another 5 patients with mismatch repair-deficient (dMMR) tumors were also enrolled. Twenty additional patients were then treated with temozolomide at 200 mg/m2 /d. Archived tumor specimens were used for immunohistochemistry to assess mismatch repair, phosphatase and tensin homolog deleted on chromosome 10 (PTEN), and O(6)-methylguanine-DNA methyltransferase (MGMT) protein expression levels. RESULTS The combination was well tolerated, although some patients required dose reductions for myelosuppression. The primary endpoint was successfully met with a DCR of 24% and 2 confirmed partial responses. The median progression-free survival was 1.8 months, and the median overall survival was 6.6 months. PTEN protein expression and MGMT protein expression were not predictors of DCR. There was also a suggestion of worse outcomes for patients with dMMR tumors. CONCLUSIONS In this heavily pretreated mCRC population, a combination of veliparib and temozolomide was well tolerated with temozolomide doses up to 200 mg/m2 /d, and it was clinically active. PARP inhibitor-based therapy merits further exploration in patients with mCRC. Cancer 2018;124:2337-46. © 2018 American Cancer Society.
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Affiliation(s)
- Michael J Pishvaian
- Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Washington, DC
| | - Rebecca S Slack
- The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Wei Jiang
- Carolinas Medical Center, Charlotte, North Carolina
| | - A Ruth He
- Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Washington, DC
| | | | - Amy Hankin
- Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Washington, DC
| | - Karen Dorsch-Vogel
- Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Washington, DC
| | - Divyesh Kukadiya
- Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Washington, DC
| | - Louis M Weiner
- Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Washington, DC
| | - John L Marshall
- Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Washington, DC
| | - Jonathan R Brody
- Jefferson Pancreas, Biliary, and Related Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania.,Department of Surgery, Thomas Jefferson University, Philadelphia, Pennsylvania.,Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
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Abstract
Background Veliparib is a potent poly(ADP-ribose) polymerase inhibitor. This phase 1 study aimed to establish the maximum tolerated dose (MTD) and recommended phase 2 dose (RP2D) of veliparib combined with various FOLFIRI regimens in patients with solid tumours. Methods Patients received veliparib (10–270 mg BID, days 1–5, 15–19) and FOLFIRI (days 1–3, 15–17) in three regimens containing 5-fluorouracil 2,400 mg/m2: irinotecan 150 mg/m2 and folinic acid 400 mg/m2 (part 1); irinotecan 180 mg/m2, folinic acid 400 mg/m2, and 5-fluorouracil 400 mg/m2 bolus (part 2), or irinotecan 180 mg/m2 (part 3). The RP2D was further evaluated in safety expansion cohorts. Preliminary antitumour activity was also assessed. Results Ninety-two patients received ≥1 veliparib dose. MTD was not reached; RP2D was set at 200 mg BID veliparib plus FOLFIRI (without 5-fluorouracil bolus). Most common treatment-emergent adverse events were neutropenia (66.3%), diarrhoea, and nausea (60.9% each). Dose-limiting toxicities (n = 4) were grade 3 gastritis and grade 4 neutropenia and febrile neutropenia. Veliparib exposure was dose-proportional, with no effects on the pharmacokinetics of FOLFIRI components. Fifteen patients had a partial response (objective response rate, 17.6%). Conclusions The acceptable safety profile and preliminary antitumour activity of veliparib plus FOLFIRI support further evaluation of this combination.
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Ferrara R, Simionato F, Ciccarese C, Grego E, Cingarlini S, Iacovelli R, Bria E, Tortora G, Melisi D. The development of PARP as a successful target for cancer therapy. Expert Rev Anticancer Ther 2017; 18:161-175. [DOI: 10.1080/14737140.2018.1419870] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Roberto Ferrara
- Section of Oncology, Department of Medicine, Università degli Studi di Verona, Verona, Italy
- Medical Oncology Unit, Azienda Ospedaliera Universitaria Integrata, Verona, Italy
- Medical Oncology Department, Gustave Roussy, Villejuif, France
| | - Francesca Simionato
- Section of Oncology, Department of Medicine, Università degli Studi di Verona, Verona, Italy
- Medical Oncology Unit, Azienda Ospedaliera Universitaria Integrata, Verona, Italy
| | - Chiara Ciccarese
- Section of Oncology, Department of Medicine, Università degli Studi di Verona, Verona, Italy
- Medical Oncology Unit, Azienda Ospedaliera Universitaria Integrata, Verona, Italy
| | - Elisabetta Grego
- Section of Oncology, Department of Medicine, Università degli Studi di Verona, Verona, Italy
- Medical Oncology Unit, Azienda Ospedaliera Universitaria Integrata, Verona, Italy
| | - Sara Cingarlini
- Medical Oncology Unit, Azienda Ospedaliera Universitaria Integrata, Verona, Italy
| | - Roberto Iacovelli
- Medical Oncology Unit, Azienda Ospedaliera Universitaria Integrata, Verona, Italy
| | - Emilio Bria
- Section of Oncology, Department of Medicine, Università degli Studi di Verona, Verona, Italy
- Medical Oncology Unit, Azienda Ospedaliera Universitaria Integrata, Verona, Italy
| | - Giampaolo Tortora
- Section of Oncology, Department of Medicine, Università degli Studi di Verona, Verona, Italy
- Medical Oncology Unit, Azienda Ospedaliera Universitaria Integrata, Verona, Italy
| | - Davide Melisi
- Section of Oncology, Department of Medicine, Università degli Studi di Verona, Verona, Italy
- Medical Oncology Unit, Azienda Ospedaliera Universitaria Integrata, Verona, Italy
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DNA Repair Defects for Therapy in Ovarian Cancer: The BRCA1/2 and PARP Inhibitor Story. INDIAN JOURNAL OF GYNECOLOGIC ONCOLOGY 2017. [DOI: 10.1007/s40944-017-0155-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Ohmoto A, Yachida S. Current status of poly(ADP-ribose) polymerase inhibitors and future directions. Onco Targets Ther 2017; 10:5195-5208. [PMID: 29138572 PMCID: PMC5667784 DOI: 10.2147/ott.s139336] [Citation(s) in RCA: 96] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Inhibitors of poly(ADP-ribose) polymerases (PARPs), which play a key role in DNA damage/repair pathways, have been developed as antitumor agents based on the concept of synthetic lethality. Synthetic lethality is the idea that cell death would be efficiently induced by simultaneous loss of function of plural key molecules, for example, by exposing tumor cells with inactivating gene mutation of BRCA-mediated DNA repair to chemically induced inhibition of PARPs. Indeed, three PARP inhibitors, olaparib, rucaparib and niraparib have already been approved in the US or Europe, mainly for the treatment of BRCA-mutant ovarian cancer. Clinical trials of various combinations of PARP inhibitors with cytotoxic or molecular-targeted agents are also underway. In particular, expanded applications of PARP inhibitors are anticipated following recent reports that defects in homologous recombination repair (HRR) are associated with mutations in repair genes other than BRCA1/BRCA2, such as ATM, ATR, PALB2, RAD51, CHEK1 and CHEK2, as well as with epigenetic loss of BRCA1 function through promoter methylation or overexpression of the BRCA2-interacting transcriptional repressor EMSY. Current topics of interest include selection of the best agent in each clinical context, identification of new treatment targets for HRR-proficient cases, and development of PARP inhibitor-based regimens that are less toxic and that prolong overall survival as well as progression-free survival. In addition, potential long-term side effects and suitable biomarkers for predicting efficacy and mechanisms of clinical resistance are in discussion. This review summarizes representative preclinical and clinical data for PARP inhibitors and discusses their potential for future applications to treat various malignancies.
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Affiliation(s)
- Akihiro Ohmoto
- Laboratory of Clinical Genomics, National Cancer Center Research Institute, Tokyo
| | - Shinichi Yachida
- Laboratory of Clinical Genomics, National Cancer Center Research Institute, Tokyo.,Department of Cancer Genome Informatics, Graduate School of Medicine, Faculty of Medicine, Osaka University, Osaka, Japan
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He L, Luo L, Zhu H, Yang H, Zhang Y, Wu H, Sun H, Jiang F, Kathera CS, Liu L, Zhuang Z, Chen H, Pan F, Hu Z, Zhang J, Guo Z. FEN1 promotes tumor progression and confers cisplatin resistance in non-small-cell lung cancer. Mol Oncol 2017; 11:640-654. [PMID: 28371273 PMCID: PMC5467497 DOI: 10.1002/1878-0261.12058] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Revised: 03/17/2017] [Accepted: 03/17/2017] [Indexed: 02/06/2023] Open
Abstract
Lung cancer is one of the leading causes of cancer mortality worldwide. The therapeutic effect of chemotherapy is limited due to the resistance of cancer cells, which remains a challenge in cancer therapeutics. In this work, we found that flap endonuclease 1 (FEN1) is overexpressed in lung cancer cells. FEN1 is a major component of the base excision repair pathway for DNA repair systems and plays important roles in maintaining genomic stability through DNA replication and repair. We showed that FEN1 is critical for the rapid proliferation of lung cancer cells. Suppression of FEN1 resulted in decreased DNA replication and accumulation of DNA damage, which subsequently induced apoptosis. Manipulating the amount of FEN1 altered the response of lung cancer cells to chemotherapeutic drugs. A small‐molecule inhibitor (C20) was used to target FEN1 and this enhanced the therapeutic effect of cisplatin. The FEN1 inhibitor significantly suppressed cell proliferation and induced DNA damage in lung cancer cells. In mouse models, the FEN1 inhibitor sensitized lung cancer cells to a DNA damage‐inducing agent and efficiently suppressed cancer progression in combination with cisplatin treatment. Our study suggests that targeting FEN1 may be a novel and efficient strategy for a tumor‐targeting therapy for lung cancer.
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Affiliation(s)
- Lingfeng He
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, China
| | - Libo Luo
- Changzhou No. 7 People's Hospital, China
| | - Hong Zhu
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, China
| | - Huan Yang
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, China
| | - Yilan Zhang
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, China
| | - Huan Wu
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, China
| | - Hongfang Sun
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, China
| | - Feng Jiang
- Department of Thoracic Surgery, Jiangsu Cancer Hospital, Affiliated Cancer Hospital of Nanjing Medical University, China
| | - Chandra S Kathera
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, China
| | - Lingjie Liu
- Southern University of Science and Technology of China, Shenzhen, China
| | - Ziheng Zhuang
- Changzhou No. 7 People's Hospital, China.,School of Pharmaceutical Engineering and Life Sciences, Changzhou University, China
| | - Haoyan Chen
- Division of Gastroenterology and Hepatology, RenJi Hospital, School of Medicine, Shanghai Jiao Tong University, China
| | - Feiyan Pan
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, China
| | - Zhigang Hu
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, China
| | - Jing Zhang
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, China
| | - Zhigang Guo
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, China
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Talens F, Jalving M, Gietema JA, Van Vugt MA. Therapeutic targeting and patient selection for cancers with homologous recombination defects. Expert Opin Drug Discov 2017; 12:565-581. [PMID: 28425306 DOI: 10.1080/17460441.2017.1322061] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
INTRODUCTION DNA double-strand breaks (DSBs) are toxic DNA lesions that can be repaired by non-homologous end-joining (NHEJ) or homologous recombination (HR). Mutations in HR genes elicit a predisposition to cancer; yet, they also result in increased sensitivity to certain DNA damaging agents and poly (ADP-ribose) polymerase (PARP) inhibitors. To optimally implement PARP inhibitor treatment, it is important that patients with HR-deficient tumors are adequately selected. Areas covered: Herein, the authors describe the HR pathway mechanistically and review the treatment of HR-deficient cancers, with a specific focus on PARP inhibition for BRCA1/2-mutated breast and ovarian cancer. In addition, mechanisms of acquired PARP inhibitor resistance are discussed. Furthermore, combination therapies with PARP inhibitors are reviewed, in the context of both HR-deficient and HR-proficient tumors and methods for proper patient selection are also discussed. Expert opinion: Currently, only patients with germline or somatic BRCA1/2 mutations are eligible for PARP inhibitor treatment and only a proportion of patients respond. Patients with HR-deficient tumors caused by other (epi)genetic events may also benefit from PARP inhibitor treatment. Ideally, selection of eligible patients for PARP inhibitor treatment include a functional HR read-out, in which cancer cells are interrogated for their ability to perform HR repair and maintain replication fork stability.
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Affiliation(s)
- Francien Talens
- a Department of Medical Oncology , University Medical Center Groningen, University of Groningen , Groningen , The Netherlands
| | - Mathilde Jalving
- a Department of Medical Oncology , University Medical Center Groningen, University of Groningen , Groningen , The Netherlands
| | - Jourik A Gietema
- a Department of Medical Oncology , University Medical Center Groningen, University of Groningen , Groningen , The Netherlands
| | - Marcel A Van Vugt
- a Department of Medical Oncology , University Medical Center Groningen, University of Groningen , Groningen , The Netherlands
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Pignochino Y, Capozzi F, D'Ambrosio L, Dell'Aglio C, Basiricò M, Canta M, Lorenzato A, Vignolo Lutati F, Aliberti S, Palesandro E, Boccone P, Galizia D, Miano S, Chiabotto G, Napione L, Gammaitoni L, Sangiolo D, Benassi MS, Pasini B, Chiorino G, Aglietta M, Grignani G. PARP1 expression drives the synergistic antitumor activity of trabectedin and PARP1 inhibitors in sarcoma preclinical models. Mol Cancer 2017; 16:86. [PMID: 28454547 PMCID: PMC5410089 DOI: 10.1186/s12943-017-0652-5] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Accepted: 04/17/2017] [Indexed: 01/05/2023] Open
Abstract
Background Enhancing the antitumor activity of the DNA-damaging drugs is an attractive strategy to improve current treatment options. Trabectedin is an isoquinoline alkylating agent with a peculiar mechanism of action. It binds to minor groove of DNA inducing single- and double-strand-breaks. These kinds of damage lead to the activation of PARP1, a first-line enzyme in DNA-damage response pathways. We hypothesized that PARP1 targeting could perpetuate trabectedin-induced DNA damage in tumor cells leading finally to cell death. Methods We investigated trabectedin and PARP1 inhibitor synergism in several tumor histotypes both in vitro and in vivo (subcutaneous and orthotopic tumor xenografts in mice). We searched for key determinants of drug synergism by comparative genomic hybridization (aCGH) and gene expression profiling (GEP) and validated their functional role. Results Trabectedin activated PARP1 enzyme and the combination with PARP1 inhibitors potentiated DNA damage, cell cycle arrest at G2/M checkpoint and apoptosis, if compared to single agents. Olaparib was the most active PARP1 inhibitor to combine with trabectedin and we confirmed the antitumor and antimetastatic activity of trabectedin/olaparib combination in mice models. However, we observed different degree of trabectedin/olaparib synergism among different cell lines. Namely, in DMR leiomyosarcoma models the combination was significantly more active than single agents, while in SJSA-1 osteosarcoma models no further advantage was obtained if compared to trabectedin alone. aCGH and GEP revealed that key components of DNA-repair pathways were involved in trabectedin/olaparib synergism. In particular, PARP1 expression dictated the degree of the synergism. Indeed, trabectedin/olaparib synergism was increased after PARP1 overexpression and reduced after PARP1 silencing. Conclusions PARP1 inhibition potentiated trabectedin activity in a PARP1-dependent manner and PARP1 expression in tumor cells might be a useful predictive biomarker that deserves clinical evaluation. Electronic supplementary material The online version of this article (doi:10.1186/s12943-017-0652-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Ymera Pignochino
- Sarcoma Unit, Medical Oncology, Candiolo Cancer Institute - FPO, IRCCS, Candiolo, Torino, Italy. .,Department of Oncology, University of Torino Medical School, Candiolo, Torino, Italy.
| | - Federica Capozzi
- Sarcoma Unit, Medical Oncology, Candiolo Cancer Institute - FPO, IRCCS, Candiolo, Torino, Italy.,Department of Oncology, University of Torino Medical School, Candiolo, Torino, Italy
| | - Lorenzo D'Ambrosio
- Sarcoma Unit, Medical Oncology, Candiolo Cancer Institute - FPO, IRCCS, Candiolo, Torino, Italy.,Department of Oncology, University of Torino Medical School, Candiolo, Torino, Italy
| | - Carmine Dell'Aglio
- Pathology Unit, Candiolo Cancer Institute - FPO, IRCCS, Candiolo, Torino, Italy
| | - Marco Basiricò
- Medical Oncology, Candiolo Cancer Institute - FPO, IRCCS, Candiolo, Torino, Italy
| | - Marta Canta
- Sarcoma Unit, Medical Oncology, Candiolo Cancer Institute - FPO, IRCCS, Candiolo, Torino, Italy.,Department of Oncology, University of Torino Medical School, Candiolo, Torino, Italy
| | - Annalisa Lorenzato
- Department of Oncology, University of Torino Medical School, Candiolo, Torino, Italy
| | | | - Sandra Aliberti
- Sarcoma Unit, Medical Oncology, Candiolo Cancer Institute - FPO, IRCCS, Candiolo, Torino, Italy
| | - Erica Palesandro
- Sarcoma Unit, Medical Oncology, Candiolo Cancer Institute - FPO, IRCCS, Candiolo, Torino, Italy.,Department of Oncology, University of Torino Medical School, Candiolo, Torino, Italy
| | - Paola Boccone
- Sarcoma Unit, Medical Oncology, Candiolo Cancer Institute - FPO, IRCCS, Candiolo, Torino, Italy.,Department of Oncology, University of Torino Medical School, Candiolo, Torino, Italy
| | - Danilo Galizia
- Sarcoma Unit, Medical Oncology, Candiolo Cancer Institute - FPO, IRCCS, Candiolo, Torino, Italy.,Department of Oncology, University of Torino Medical School, Candiolo, Torino, Italy
| | - Sara Miano
- Sarcoma Unit, Medical Oncology, Candiolo Cancer Institute - FPO, IRCCS, Candiolo, Torino, Italy.,Department of Oncology, University of Torino Medical School, Candiolo, Torino, Italy
| | - Giulia Chiabotto
- Sarcoma Unit, Medical Oncology, Candiolo Cancer Institute - FPO, IRCCS, Candiolo, Torino, Italy
| | - Lucia Napione
- Department of Oncology, University of Torino Medical School, Candiolo, Torino, Italy.,Laboratory of Vascular Oncology, Candiolo Cancer Institute - FPO, IRCCS, Candiolo, Torino, Italy.,Current address: Department of Applied Science and Technology, Politecnico di Torino, Torino, Italy
| | - Loretta Gammaitoni
- Laboratory of Vascular Oncology, Candiolo Cancer Institute - FPO, IRCCS, Candiolo, Torino, Italy
| | - Dario Sangiolo
- Department of Oncology, University of Torino Medical School, Candiolo, Torino, Italy.,Laboratory of Vascular Oncology, Candiolo Cancer Institute - FPO, IRCCS, Candiolo, Torino, Italy
| | - Maria Serena Benassi
- Experimental Oncology Laboratory, IRCCS Istituto Ortopedico Rizzoli, Bologna, Italy
| | - Barbara Pasini
- Department of Genetics, Biology and Biochemistry, University of Torino, Torino, Italy
| | | | - Massimo Aglietta
- Department of Oncology, University of Torino Medical School, Candiolo, Torino, Italy.,Medical Oncology, Candiolo Cancer Institute - FPO, IRCCS, Candiolo, Torino, Italy
| | - Giovanni Grignani
- Sarcoma Unit, Medical Oncology, Candiolo Cancer Institute - FPO, IRCCS, Candiolo, Torino, Italy.
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Du Y, Yamaguchi H, Hsu JL, Hung MC. PARP inhibitors as precision medicine for cancer treatment. Natl Sci Rev 2017. [DOI: 10.1093/nsr/nwx027] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
AbstractPersonalized or precision medicine is an emerging treatment approach tailored to individuals or certain groups of patients based on their unique characteristics. These types of therapies guided by biomarkers tend to be more effective than traditional approaches, especially in cancer. The inhibitor against poly (ADP-ribose) polymerase (PARP), olaparib (Lynparza, AstraZeneca), which was approved by the US Food and Drug Administration (FDA) in 2014, demonstrated efficacy specifically for ovarian cancer patients harboring mutations in BRCA genes, which encode proteins in DNA double-strand break repairs. However, the response to PARP inhibitors has been less encouraging in other cancer types that also carry defects in the BRCA genes. Thus, furthering our understanding of the underlying mechanism of PARP inhibitors and resistance is critical to improve their efficacy. In this review, we summarize the results of preclinical studies and the clinical application of PARP inhibitors, and discuss the future direction of PARP inhibitors as a potential marker-guided personalized medicine for cancer treatment.
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Affiliation(s)
- Yi Du
- Department of Molecular and Cellular Oncology, The University of Texas MD Anderson Cancer Center, Houston 77030
| | - Hirohito Yamaguchi
- Department of Molecular and Cellular Oncology, The University of Texas MD Anderson Cancer Center, Houston 77030
| | - Jennifer L. Hsu
- Department of Molecular and Cellular Oncology, The University of Texas MD Anderson Cancer Center, Houston 77030
- Graduate Institute of Biomedical Sciences and Center for Molecular Medicine, China Medical University, Taichung 40402
- Department of Biotechnology, Asia University, Taichung 41354
| | - Mien-Chie Hung
- Department of Molecular and Cellular Oncology, The University of Texas MD Anderson Cancer Center, Houston 77030
- Graduate Institute of Biomedical Sciences and Center for Molecular Medicine, China Medical University, Taichung 40402
- Department of Biotechnology, Asia University, Taichung 41354
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36
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Gojo I, Beumer JH, Pratz KW, McDevitt MA, Baer MR, Blackford AL, Smith BD, Gore SD, Carraway HE, Showel MM, Levis MJ, Dezern AE, Gladstone DE, Ji JJ, Wang L, Kinders RJ, Pouquet M, Ali-Walbi I, Rudek MA, Poh W, Herman JG, Karnitz LM, Kaufmann SH, Chen A, Karp JE. A Phase 1 Study of the PARP Inhibitor Veliparib in Combination with Temozolomide in Acute Myeloid Leukemia. Clin Cancer Res 2017; 23:697-706. [PMID: 27503200 PMCID: PMC5290001 DOI: 10.1158/1078-0432.ccr-16-0984] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2016] [Revised: 06/23/2016] [Accepted: 07/17/2016] [Indexed: 11/16/2022]
Abstract
PURPOSE In preclinical studies, the PARP inhibitor veliparib enhanced the antileukemic action of temozolomide through potentiation of DNA damage. Accordingly, we conducted a phase 1 study of temozolomide with escalating doses of veliparib in patients with relapsed, refractory acute myeloid leukemia (AML) or AML arising from aggressive myeloid malignancies. EXPERIMENTAL DESIGN Patients received veliparib [20-200 mg once a day on day 1 and twice daily on days 4-12 in cycle 1 (days 1-8 in cycle ≥2)] and temozolomide [150-200 mg/m2 daily on days 3-9 in cycle 1 (days 1-5 in cycle ≥2)] every 28 to 56 days. Veliparib pharmacokinetics and pharmacodynamics [ability to inhibit poly(ADP-ribose) polymer (PAR) formation and induce H2AX phosphorylation] were assessed. Pretreatment levels of MGMT and PARP1 protein, methylation of the MGMT promoter, and integrity of the Fanconi anemia pathway were also examined. RESULTS Forty-eight patients were treated at seven dose levels. Dose-limiting toxicities were oral mucositis and esophagitis lasting >7 days. The MTD was veliparib 150 mg twice daily with temozolomide 200 mg/m2 daily. The complete response (CR) rate was 17% (8/48 patients). Veliparib exposure as well as inhibition of PAR polymer formation increased dose proportionately. A veliparib-induced increase in H2AX phosphorylation in CD34+ cells was observed in responders. Three of 4 patients with MGMT promoter methylation achieved CR. CONCLUSIONS Veliparib plus temozolomide is well tolerated, with activity in advanced AML. Further evaluation of this regimen and of treatment-induced phosphorylation of H2AX and MGMT methylation as potential response predictors appears warranted. Clin Cancer Res; 23(3); 697-706. ©2016 AACR.
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Affiliation(s)
- Ivana Gojo
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins Hospital, Baltimore, Maryland.
| | - Jan H Beumer
- Cancer Therapeutics Program, University of Pittsburgh Cancer Institute, University of Pittsburgh, Pittsburgh, Pennsylvania
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Keith W Pratz
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins Hospital, Baltimore, Maryland
| | - Michael A McDevitt
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins Hospital, Baltimore, Maryland
| | - Maria R Baer
- Department of Medicine, University of Maryland Greenebaum Cancer Center, Baltimore, Maryland
| | - Amanda L Blackford
- Department of Statistics, Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins Hospital, Baltimore, Maryland
| | - B Douglas Smith
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins Hospital, Baltimore, Maryland
| | - Steven D Gore
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins Hospital, Baltimore, Maryland
| | - Hetty E Carraway
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins Hospital, Baltimore, Maryland
| | - Margaret M Showel
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins Hospital, Baltimore, Maryland
| | - Mark J Levis
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins Hospital, Baltimore, Maryland
| | - Amy E Dezern
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins Hospital, Baltimore, Maryland
| | - Douglas E Gladstone
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins Hospital, Baltimore, Maryland
| | - Jiuping Jay Ji
- Laboratory of Human Toxicology and Pharmacology, Applied/Developmental Research Support Directorate, SAIC-Frederick, Inc., NCI-Frederick, Frederick, Maryland
| | - Lihua Wang
- Laboratory of Human Toxicology and Pharmacology, Applied/Developmental Research Support Directorate, SAIC-Frederick, Inc., NCI-Frederick, Frederick, Maryland
| | - Robert J Kinders
- Laboratory of Human Toxicology and Pharmacology, Applied/Developmental Research Support Directorate, SAIC-Frederick, Inc., NCI-Frederick, Frederick, Maryland
| | - Marie Pouquet
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Ismail Ali-Walbi
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Michelle A Rudek
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins Hospital, Baltimore, Maryland
| | - Weijie Poh
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins Hospital, Baltimore, Maryland
| | - James G Herman
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins Hospital, Baltimore, Maryland
| | - Larry M Karnitz
- Division of Oncology Research and Department of Molecular Pharmacology, Mayo Clinic, Rochester, Minnesota
| | - Scott H Kaufmann
- Division of Oncology Research and Department of Molecular Pharmacology, Mayo Clinic, Rochester, Minnesota
| | - Alice Chen
- Cancer Therapy Evaluation Program, NCI, Rockville, Maryland
| | - Judith E Karp
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins Hospital, Baltimore, Maryland
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O'Sullivan Coyne G, Chen AP, Meehan R, Doroshow JH. PARP Inhibitors in Reproductive System Cancers: Current Use and Developments. Drugs 2017; 77:113-130. [PMID: 28078645 PMCID: PMC5266774 DOI: 10.1007/s40265-016-0688-7] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The repair of DNA damage is a critical cellular process governed by multiple biochemical pathways that are often found to be defective in cancer cells. The poly(ADP-ribose) polymerase (PARP) family of proteins controls response to single-strand DNA breaks by detecting these damaged sites and recruiting the proper factors for repair. Blocking this pathway forces cells to utilize complementary mechanisms to repair DNA damage. While PARP inhibition may not, in itself, be sufficient to cause tumor cell death, inhibition of DNA repair with PARP inhibitors is an effective cytotoxic strategy when it is used in patients who carry other defective DNA-repair mechanisms, such as mutations in the genes BRCA 1 and 2. This discovery has supported the development of PARP inhibitors (PARPi), agents that have proven effective against various types of tumors that carry BRCA mutations. With the application of next-generation sequencing of tumors, there is increased interest in looking beyond BRCA mutations to identify genetic and epigenetic aberrations that might lead to similar defects in DNA repair, conferring susceptibility to PARP inhibition. Identification of these genetic lesions and the development of screening assays for their detection may allow for the selection of patients most likely to respond to this class of anticancer agents. This article provides an overview of clinical trial results obtained with PARPi and describes the companion diagnostic assays being established for patient selection. In addition, we review known mechanisms for resistance to PARPi and potential strategies for combining these agents with other types of therapy.
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Affiliation(s)
- Geraldine O'Sullivan Coyne
- Early Clinical Trials Development Program, Division of Cancer Treatment and Diagnosis, National Cancer Institute, National Institutes of Health, 31 Center Drive, Room 3A44, Bethesda, MD, 20892, USA
| | - Alice P Chen
- Early Clinical Trials Development Program, Division of Cancer Treatment and Diagnosis, National Cancer Institute, National Institutes of Health, 31 Center Drive, Room 3A44, Bethesda, MD, 20892, USA
| | - Robert Meehan
- Early Clinical Trials Development Program, Division of Cancer Treatment and Diagnosis, National Cancer Institute, National Institutes of Health, 31 Center Drive, Room 3A44, Bethesda, MD, 20892, USA
| | - James H Doroshow
- Early Clinical Trials Development Program, Division of Cancer Treatment and Diagnosis, National Cancer Institute, National Institutes of Health, 31 Center Drive, Room 3A44, Bethesda, MD, 20892, USA.
- Developmental Therapeutics Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, 20892, USA.
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38
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Isakoff SJ, Puhalla S, Domchek SM, Friedlander M, Kaufman B, Robson M, Telli ML, Diéras V, Han HS, Garber JE, Johnson EF, Maag D, Qin Q, Giranda VL, Shepherd SP. A randomized Phase II study of veliparib with temozolomide or carboplatin/paclitaxel versus placebo with carboplatin/paclitaxel in BRCA1/2 metastatic breast cancer: design and rationale. Future Oncol 2016; 13:307-320. [PMID: 27739325 PMCID: PMC5618936 DOI: 10.2217/fon-2016-0412] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Veliparib is an orally administered poly(ADP-ribose) polymerase inhibitor that is being studied in Phase I–III clinical trials, including Phase III studies in non-small-cell lung cancer, ovarian cancer and breast cancer. Tumor cells with deleterious BRCA1 or BRCA2 mutations are deficient in homologous recombination DNA repair and are intrinsically sensitive to platinum therapy and poly(ADP-ribose) polymerase inhibitors. We describe herein the design and rationale of a Phase II trial investigating whether the addition of veliparib to temozolomide or carboplatin/paclitaxel provides clinical benefit over carboplatin/paclitaxel with placebo in patients with locally recurrent or metastatic breast cancer harboring a deleterious BRCA1 or BRCA2 germline mutation (Trial registration: EudraCT 2011-002913-12, NCT01506609).
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Affiliation(s)
- Steven J Isakoff
- Department of Medicine, Massachusetts General Hospital, Boston, MA 02114, USA
| | - Shannon Puhalla
- Department of Medicine, University of Pittsburgh Cancer Institute, Pittsburgh, PA 15232, USA
| | - Susan M Domchek
- Basser Center for BRCA, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Michael Friedlander
- Gynaecological Cancer Centre, Royal Hospital for Women, Sydney, NSW 2031, Australia
| | - Bella Kaufman
- Department of General Oncology, Chaim Sheba Medical Center, Ramat Gan 52 621, Israel
| | - Mark Robson
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY 10022, USA
| | - Melinda L Telli
- Department of Medical Oncology, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Véronique Diéras
- Department of Medical Oncology, Institut Curie, Paris 75248, France
| | - Hyo Sook Han
- The Center for Women's Oncology, Moffitt Cancer Center, Tampa, FL 33612, USA
| | - Judy E Garber
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA 02215, USA
| | | | | | - Qin Qin
- AbbVie Inc., Chicago, IL 60064, USA
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Somnay Y, Lubner S, Gill H, Matsumura JB, Chen H. The PARP inhibitor ABT-888 potentiates dacarbazine-induced cell death in carcinoids. Cancer Gene Ther 2016; 23:348-354. [PMID: 27632933 PMCID: PMC5083201 DOI: 10.1038/cgt.2016.39] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2016] [Accepted: 08/12/2016] [Indexed: 02/07/2023]
Abstract
Monoagent DNA-alkylating chemotherapies like dacarbazine are among a paucity of medical treatments for advanced carcinoid tumors, but are limited by host toxicity and intrinsic chemoresistance through the base excision repair (BER) pathway via poly (ADP-ribose) polymerase (PARP). Hence, inhibitors of PARP may potentiate DNA-damaging agents by blocking BER and DNA restoration. We show that the PARP inhibitor ABT-888 (Veliparib) enhances the cytotoxic effects of dacarbazine in carcinoids. Two human carcinoid cell lines (BON and H727) treated with a combination of ABT-888 and dacarbazine resulted in synergistic growth inhibition signified by combination indices <1 on the Chou-Talalay scale. ABT-888 administered prior to varying dacarbazine doses promoted the suppression of neuroendocrine biomarkers of malignancy ASCL1 and CgA, shown by Western analysis. ATM phosphorylation and p21Waf1/Cip1 activation, indicative of DNA damage, were increased by ABT-888 when combined with dacarbazine treatment, suggesting BER pathway attenuation by ABT-888. PE Annexin V/7-AAD staining and sorting revealed a profound induction of apoptosis following combination treatment, which was further confirmed by increased PARP cleavage. These results demonstrate that ABT-888 synergizes dacarbazine treatment in carcinoids. Therefore, ABT-888 may help treat carcinoids unresponsive or refractory to mainstay therapies.
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Affiliation(s)
- Y Somnay
- Endocrine Surgery Research Laboratories, Department of Surgery, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
| | - S Lubner
- Division of Hematology and Medical Oncology, Department of Medicine, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
| | - H Gill
- Endocrine Surgery Research Laboratories, Department of Surgery, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
| | - J B Matsumura
- Endocrine Surgery Research Laboratories, Department of Surgery, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
| | - H Chen
- Endocrine Surgery Research Laboratories, Department of Surgery, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA.,Department of Surgery, University of Alabama- Birmingham, Birmingham, AL, USA
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40
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Zhang J, Dai Q, Park D, Deng X. Targeting DNA Replication Stress for Cancer Therapy. Genes (Basel) 2016; 7:genes7080051. [PMID: 27548226 PMCID: PMC4999839 DOI: 10.3390/genes7080051] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Revised: 08/06/2016] [Accepted: 08/15/2016] [Indexed: 01/09/2023] Open
Abstract
The human cellular genome is under constant stress from extrinsic and intrinsic factors, which can lead to DNA damage and defective replication. In normal cells, DNA damage response (DDR) mediated by various checkpoints will either activate the DNA repair system or induce cellular apoptosis/senescence, therefore maintaining overall genomic integrity. Cancer cells, however, due to constitutive growth signaling and defective DDR, may exhibit “replication stress” —a phenomenon unique to cancer cells that is described as the perturbation of error-free DNA replication and slow-down of DNA synthesis. Although replication stress has been proven to induce genomic instability and tumorigenesis, recent studies have counterintuitively shown that enhancing replicative stress through further loosening of the remaining checkpoints in cancer cells to induce their catastrophic failure of proliferation may provide an alternative therapeutic approach. In this review, we discuss the rationale to enhance replicative stress in cancer cells, past approaches using traditional radiation and chemotherapy, and emerging approaches targeting the signaling cascades induced by DNA damage. We also summarize current clinical trials exploring these strategies and propose future research directions including the use of combination therapies, and the identification of potential new targets and biomarkers to track and predict treatment responses to targeting DNA replication stress.
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Affiliation(s)
- Jun Zhang
- Division of Hematology, Oncology and Blood & Marrow Transplantation, Department of Internal Medicine, Holden Comprehensive Cancer Center, University of Iowa Carver College of Medicine, 200 Hawkins Drive, Iowa City, IA 52242, USA.
| | - Qun Dai
- Division of Hematology, Oncology and Blood & Marrow Transplantation, Department of Internal Medicine, Holden Comprehensive Cancer Center, University of Iowa Carver College of Medicine, 200 Hawkins Drive, Iowa City, IA 52242, USA.
| | - Dongkyoo Park
- Division of Cancer Biology, Department of Radiation Oncology, Emory University School of Medicine and Winship Cancer Institute of Emory University, 1365C Clifton Road NE, Atlanta, GA 30322, USA.
| | - Xingming Deng
- Division of Cancer Biology, Department of Radiation Oncology, Emory University School of Medicine and Winship Cancer Institute of Emory University, 1365C Clifton Road NE, Atlanta, GA 30322, USA.
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Wang H, Feng W, Lu Y, Li H, Xiang W, Chen Z, He M, Zhao L, Sun X, Lei B, Qi S, Liu Y. Expression of dynein, cytoplasmic 2, heavy chain 1 (DHC2) associated with glioblastoma cell resistance to temozolomide. Sci Rep 2016; 6:28948. [PMID: 27375225 PMCID: PMC4931463 DOI: 10.1038/srep28948] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2015] [Accepted: 06/07/2016] [Indexed: 01/08/2023] Open
Abstract
Temozolomide (TMZ) is the main chemotherapeutic drug utilized for the treatment of glioblastoma multiforme (GMB), however, drug resistance often leads to tumor recurrence and poor outcomes. GMB cell lines were treated with TMZ for up to two weeks and then subjected to proteomics analysis to identify the underlying molecular pathology that is associated with TMZ resistance. Proteomics data showed that TMZ altered expression of proteins that related to cytoskeleton structure and function, such as DHC2 and KIF2B. qRT-PCR and immunofluorescence were used to verify expression of DHC2 and KIF2B in these cells. Immunohistochemistry was used to verify expression of these two proteins in xenografts of a nude mouse model, and ex vivo GBM tissue samples. Their expression was knocked down using siRNA to confirm their role in the regulation of GBM cell sensitivity to TMZ. Knockdown of DHC2 expression enhanced sensitivity of U87 cells to TMZ treatment. Ex vivo data showed that DHC2 expression in GBM tissue samples was associated with tumor recurrence after TMZ chemotherapy. These results indicated cytoskeleton related protein DHC2 reduced sensitivity of GBM cells to TMZ treatment. Further studies should assess DHC2 as a novel target in GBM for TMZ combination treatment.
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Affiliation(s)
- Hai Wang
- Department of Neurosurgery, Nanfang Glioma Center, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
| | - Wenfeng Feng
- Department of Neurosurgery, Nanfang Glioma Center, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
| | - Yuntao Lu
- Department of Neurosurgery, Nanfang Glioma Center, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
| | - Hezhen Li
- Department of Neurosurgery, Nanfang Glioma Center, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
| | - Wei Xiang
- Department of Neurosurgery, Nanfang Glioma Center, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
| | - Ziyang Chen
- Department of Neurosurgery, Nanfang Glioma Center, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
| | - Minyi He
- Department of Organ Transplantation, Zhujiang Hospital, Southern Medical University, Guangzhou 510515, China
| | - Liang Zhao
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
| | - Xuegang Sun
- School of Traditional Chinese Medicine, Southern Medical University, Guangzhou 510515,China
| | - Bingxi Lei
- Department of Neurosurgery, Nanfang Glioma Center, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
| | - Songtao Qi
- Department of Neurosurgery, Nanfang Glioma Center, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
| | - Yawei Liu
- Department of Neurosurgery, Nanfang Glioma Center, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China.,Nanfang Neurosurgery Research Institution, Nanfang hospital, Southern Medical University, Guangzhou 510515,China
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42
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Jenner ZB, Sood AK, Coleman RL. Evaluation of rucaparib and companion diagnostics in the PARP inhibitor landscape for recurrent ovarian cancer therapy. Future Oncol 2016; 12:1439-56. [PMID: 27087632 PMCID: PMC4976841 DOI: 10.2217/fon-2016-0002] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2016] [Accepted: 04/04/2016] [Indexed: 12/28/2022] Open
Abstract
Rucaparib camsylate (CO-338; 8-fluoro-2-{4-[(methylamino)methyl]phenyl}-1,3,4,5-tetrahydro-6H-azepino[5,4,3-cd]indol-6-one ((1S,4R)-7,7-dimethyl-2-oxobicyclo[2.2.1]hept-1-yl)methanesulfonic acid salt) is a PARP1, 2 and 3 inhibitor. Phase I studies identified a recommended Phase II dose of 600 mg orally twice daily. ARIEL2 Part 1 established a tumor genomic profiling test for homologous recombination loss of heterozygosity quantification using a next-generation sequencing companion diagnostic (CDx). Rucaparib received US FDA Breakthrough Therapy designation for treatment of platinum-sensitive BRCA-mutated advanced ovarian cancer patients who received greater than two lines of platinum-based therapy. Comparable to rucaparib development, other PARP inhibitors, such as olaparib, niraparib, veliparib and talazoparib, are developing CDx tests for targeted therapy. PARP inhibitor clinical trials and CDx assays are discussed in this review, as are potential PARP inhibitor combination therapies and likely resistance mechanisms.
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Affiliation(s)
- Zachary B Jenner
- Department of Gynecologic Oncology & Reproductive Medicine, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
- McGovern Medical School, formerly The University of Texas Health Science Center at Houston (UTHealth) Medical School, Houston, TX, USA
| | - Anil K Sood
- Department of Gynecologic Oncology & Reproductive Medicine, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Robert L Coleman
- Department of Gynecologic Oncology & Reproductive Medicine, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
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Gupta SK, Kizilbash SH, Carlson BL, Mladek AC, Boakye-Agyeman F, Bakken KK, Pokorny JL, Schroeder MA, Decker PA, Cen L, Eckel-Passow JE, Sarkar G, Ballman KV, Reid JM, Jenkins RB, Verhaak RG, Sulman EP, Kitange GJ, Sarkaria JN. Delineation of MGMT Hypermethylation as a Biomarker for Veliparib-Mediated Temozolomide-Sensitizing Therapy of Glioblastoma. J Natl Cancer Inst 2016; 108:djv369. [PMID: 26615020 PMCID: PMC4862419 DOI: 10.1093/jnci/djv369] [Citation(s) in RCA: 92] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2015] [Revised: 09/23/2015] [Accepted: 10/29/2015] [Indexed: 01/18/2023] Open
Abstract
BACKGROUND Sensitizing effects of poly-ADP-ribose polymerase inhibitors have been studied in several preclinical models, but a clear understanding of predictive biomarkers is lacking. In this study, in vivo efficacy of veliparib combined with temozolomide (TMZ) was evaluated in a large panel of glioblastoma multiforme (GBM) patient-derived xenografts (PDX) and potential biomarkers were analyzed. METHODS The efficacy of TMZ alone vs TMZ/veliparib was compared in a panel of 28 GBM PDX lines grown as orthotopic xenografts (8-10 mice per group); all tests of statistical significance were two-sided. DNA damage was analyzed by γH2AX immunostaining and promoter methylation of DNA repair gene O6-methylguanine-DNA-methyltransferase (MGMT) by Clinical Laboratory Improvement Amendments-approved methylation-specific polymerase chain reaction. RESULTS The combination of TMZ/veliparib statistically significantly extended survival of GBM models (P < .05 by log-rank) compared with TMZ alone in five of 20 MGMT-hypermethylated lines (average extension in median survival = 87 days, range = 20-150 days), while the combination was ineffective in six MGMT-unmethylated lines. In the MGMT promoter-hypermethylated GBM12 line (median survival with TMZ+veliparib = 189 days, 95% confidence interval [CI] = 59 to 289 days, vs TMZ alone = 98 days, 95% CI = 49 to 210 days, P = .04), the profound TMZ-sensitizing effect of veliparib was lost when MGMT was overexpressed (median survival with TMZ+veliparib = 36 days, 95% CI = 28 to 38 days, vs TMZ alone = 35 days, 95% CI = 32 to 37 days, P = .87), and a similar association was observed in two nearly isogenic GBM28 sublines with an intact vs deleted MGMT locus. In comparing DNA damage signaling after dosing with veliparib/TMZ or TMZ alone, increased phosphorylation of damage-responsive proteins (KAP1, Chk1, Chk2, and H2AX) was observed only in MGMT promoter-hypermethylated lines. CONCLUSION Veliparib statistically significantly enhances (P < .001) the efficacy of TMZ in tumors with MGMT promoter hypermethylation. Based on these data, MGMT promoter hypermethylation is being used as an eligibility criterion for A071102 (NCT02152982), the phase II/III clinical trial evaluating TMZ/veliparib combination in patients with GBM.
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Affiliation(s)
- Shiv K Gupta
- Department of Radiation Oncology (SKG, BLC, ACM, KKB, JLP, MAS, LC, GJK, JNS), Division of Medical Oncology (SHK), Molecular Pharmacology and Experimental Therapeutics (FBA, JMR), Division of Biomedical Statistics and Informatics (PAD, JEEP, KVB), and Laboratory Medicine and Pathology (GS, RBJ), Mayo Clinic, Rochester MN; The University of Texas, MD Anderson Cancer Center, Houston, TX (RGV, EPS)
| | - Sani H Kizilbash
- Department of Radiation Oncology (SKG, BLC, ACM, KKB, JLP, MAS, LC, GJK, JNS), Division of Medical Oncology (SHK), Molecular Pharmacology and Experimental Therapeutics (FBA, JMR), Division of Biomedical Statistics and Informatics (PAD, JEEP, KVB), and Laboratory Medicine and Pathology (GS, RBJ), Mayo Clinic, Rochester MN; The University of Texas, MD Anderson Cancer Center, Houston, TX (RGV, EPS)
| | - Brett L Carlson
- Department of Radiation Oncology (SKG, BLC, ACM, KKB, JLP, MAS, LC, GJK, JNS), Division of Medical Oncology (SHK), Molecular Pharmacology and Experimental Therapeutics (FBA, JMR), Division of Biomedical Statistics and Informatics (PAD, JEEP, KVB), and Laboratory Medicine and Pathology (GS, RBJ), Mayo Clinic, Rochester MN; The University of Texas, MD Anderson Cancer Center, Houston, TX (RGV, EPS)
| | - Ann C Mladek
- Department of Radiation Oncology (SKG, BLC, ACM, KKB, JLP, MAS, LC, GJK, JNS), Division of Medical Oncology (SHK), Molecular Pharmacology and Experimental Therapeutics (FBA, JMR), Division of Biomedical Statistics and Informatics (PAD, JEEP, KVB), and Laboratory Medicine and Pathology (GS, RBJ), Mayo Clinic, Rochester MN; The University of Texas, MD Anderson Cancer Center, Houston, TX (RGV, EPS)
| | - Felix Boakye-Agyeman
- Department of Radiation Oncology (SKG, BLC, ACM, KKB, JLP, MAS, LC, GJK, JNS), Division of Medical Oncology (SHK), Molecular Pharmacology and Experimental Therapeutics (FBA, JMR), Division of Biomedical Statistics and Informatics (PAD, JEEP, KVB), and Laboratory Medicine and Pathology (GS, RBJ), Mayo Clinic, Rochester MN; The University of Texas, MD Anderson Cancer Center, Houston, TX (RGV, EPS)
| | - Katrina K Bakken
- Department of Radiation Oncology (SKG, BLC, ACM, KKB, JLP, MAS, LC, GJK, JNS), Division of Medical Oncology (SHK), Molecular Pharmacology and Experimental Therapeutics (FBA, JMR), Division of Biomedical Statistics and Informatics (PAD, JEEP, KVB), and Laboratory Medicine and Pathology (GS, RBJ), Mayo Clinic, Rochester MN; The University of Texas, MD Anderson Cancer Center, Houston, TX (RGV, EPS)
| | - Jenny L Pokorny
- Department of Radiation Oncology (SKG, BLC, ACM, KKB, JLP, MAS, LC, GJK, JNS), Division of Medical Oncology (SHK), Molecular Pharmacology and Experimental Therapeutics (FBA, JMR), Division of Biomedical Statistics and Informatics (PAD, JEEP, KVB), and Laboratory Medicine and Pathology (GS, RBJ), Mayo Clinic, Rochester MN; The University of Texas, MD Anderson Cancer Center, Houston, TX (RGV, EPS)
| | - Mark A Schroeder
- Department of Radiation Oncology (SKG, BLC, ACM, KKB, JLP, MAS, LC, GJK, JNS), Division of Medical Oncology (SHK), Molecular Pharmacology and Experimental Therapeutics (FBA, JMR), Division of Biomedical Statistics and Informatics (PAD, JEEP, KVB), and Laboratory Medicine and Pathology (GS, RBJ), Mayo Clinic, Rochester MN; The University of Texas, MD Anderson Cancer Center, Houston, TX (RGV, EPS)
| | - Paul A Decker
- Department of Radiation Oncology (SKG, BLC, ACM, KKB, JLP, MAS, LC, GJK, JNS), Division of Medical Oncology (SHK), Molecular Pharmacology and Experimental Therapeutics (FBA, JMR), Division of Biomedical Statistics and Informatics (PAD, JEEP, KVB), and Laboratory Medicine and Pathology (GS, RBJ), Mayo Clinic, Rochester MN; The University of Texas, MD Anderson Cancer Center, Houston, TX (RGV, EPS)
| | - Ling Cen
- Department of Radiation Oncology (SKG, BLC, ACM, KKB, JLP, MAS, LC, GJK, JNS), Division of Medical Oncology (SHK), Molecular Pharmacology and Experimental Therapeutics (FBA, JMR), Division of Biomedical Statistics and Informatics (PAD, JEEP, KVB), and Laboratory Medicine and Pathology (GS, RBJ), Mayo Clinic, Rochester MN; The University of Texas, MD Anderson Cancer Center, Houston, TX (RGV, EPS)
| | - Jeanette E Eckel-Passow
- Department of Radiation Oncology (SKG, BLC, ACM, KKB, JLP, MAS, LC, GJK, JNS), Division of Medical Oncology (SHK), Molecular Pharmacology and Experimental Therapeutics (FBA, JMR), Division of Biomedical Statistics and Informatics (PAD, JEEP, KVB), and Laboratory Medicine and Pathology (GS, RBJ), Mayo Clinic, Rochester MN; The University of Texas, MD Anderson Cancer Center, Houston, TX (RGV, EPS)
| | - Gobinda Sarkar
- Department of Radiation Oncology (SKG, BLC, ACM, KKB, JLP, MAS, LC, GJK, JNS), Division of Medical Oncology (SHK), Molecular Pharmacology and Experimental Therapeutics (FBA, JMR), Division of Biomedical Statistics and Informatics (PAD, JEEP, KVB), and Laboratory Medicine and Pathology (GS, RBJ), Mayo Clinic, Rochester MN; The University of Texas, MD Anderson Cancer Center, Houston, TX (RGV, EPS)
| | - Karla V Ballman
- Department of Radiation Oncology (SKG, BLC, ACM, KKB, JLP, MAS, LC, GJK, JNS), Division of Medical Oncology (SHK), Molecular Pharmacology and Experimental Therapeutics (FBA, JMR), Division of Biomedical Statistics and Informatics (PAD, JEEP, KVB), and Laboratory Medicine and Pathology (GS, RBJ), Mayo Clinic, Rochester MN; The University of Texas, MD Anderson Cancer Center, Houston, TX (RGV, EPS)
| | - Joel M Reid
- Department of Radiation Oncology (SKG, BLC, ACM, KKB, JLP, MAS, LC, GJK, JNS), Division of Medical Oncology (SHK), Molecular Pharmacology and Experimental Therapeutics (FBA, JMR), Division of Biomedical Statistics and Informatics (PAD, JEEP, KVB), and Laboratory Medicine and Pathology (GS, RBJ), Mayo Clinic, Rochester MN; The University of Texas, MD Anderson Cancer Center, Houston, TX (RGV, EPS)
| | - Robert B Jenkins
- Department of Radiation Oncology (SKG, BLC, ACM, KKB, JLP, MAS, LC, GJK, JNS), Division of Medical Oncology (SHK), Molecular Pharmacology and Experimental Therapeutics (FBA, JMR), Division of Biomedical Statistics and Informatics (PAD, JEEP, KVB), and Laboratory Medicine and Pathology (GS, RBJ), Mayo Clinic, Rochester MN; The University of Texas, MD Anderson Cancer Center, Houston, TX (RGV, EPS)
| | - Roeland G Verhaak
- Department of Radiation Oncology (SKG, BLC, ACM, KKB, JLP, MAS, LC, GJK, JNS), Division of Medical Oncology (SHK), Molecular Pharmacology and Experimental Therapeutics (FBA, JMR), Division of Biomedical Statistics and Informatics (PAD, JEEP, KVB), and Laboratory Medicine and Pathology (GS, RBJ), Mayo Clinic, Rochester MN; The University of Texas, MD Anderson Cancer Center, Houston, TX (RGV, EPS)
| | - Erik P Sulman
- Department of Radiation Oncology (SKG, BLC, ACM, KKB, JLP, MAS, LC, GJK, JNS), Division of Medical Oncology (SHK), Molecular Pharmacology and Experimental Therapeutics (FBA, JMR), Division of Biomedical Statistics and Informatics (PAD, JEEP, KVB), and Laboratory Medicine and Pathology (GS, RBJ), Mayo Clinic, Rochester MN; The University of Texas, MD Anderson Cancer Center, Houston, TX (RGV, EPS)
| | - Gaspar J Kitange
- Department of Radiation Oncology (SKG, BLC, ACM, KKB, JLP, MAS, LC, GJK, JNS), Division of Medical Oncology (SHK), Molecular Pharmacology and Experimental Therapeutics (FBA, JMR), Division of Biomedical Statistics and Informatics (PAD, JEEP, KVB), and Laboratory Medicine and Pathology (GS, RBJ), Mayo Clinic, Rochester MN; The University of Texas, MD Anderson Cancer Center, Houston, TX (RGV, EPS)
| | - Jann N Sarkaria
- Department of Radiation Oncology (SKG, BLC, ACM, KKB, JLP, MAS, LC, GJK, JNS), Division of Medical Oncology (SHK), Molecular Pharmacology and Experimental Therapeutics (FBA, JMR), Division of Biomedical Statistics and Informatics (PAD, JEEP, KVB), and Laboratory Medicine and Pathology (GS, RBJ), Mayo Clinic, Rochester MN; The University of Texas, MD Anderson Cancer Center, Houston, TX (RGV, EPS).
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Kitange GJ, Mladek AC, Schroeder MA, Pokorny JC, Carlson BL, Zhang Y, Nair AA, Lee JH, Yan H, Decker PA, Zhang Z, Sarkaria JN. Retinoblastoma Binding Protein 4 Modulates Temozolomide Sensitivity in Glioblastoma by Regulating DNA Repair Proteins. Cell Rep 2016; 14:2587-98. [PMID: 26972001 DOI: 10.1016/j.celrep.2016.02.045] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Revised: 12/22/2015] [Accepted: 02/04/2016] [Indexed: 01/18/2023] Open
Abstract
Here we provide evidence that RBBP4 modulates temozolomide (TMZ) sensitivity through coordinate regulation of two key DNA repair genes critical for recovery from TMZ-induced DNA damage: methylguanine-DNA-methyltransferase (MGMT) and RAD51. Disruption of RBBP4 enhanced TMZ sensitivity, induced synthetic lethality to PARP inhibition, and increased DNA damage signaling in response to TMZ. Moreover, RBBP4 silencing enhanced TMZ-induced H2AX phosphorylation and apoptosis in GBM cells. Intriguingly, RBBP4 knockdown suppressed the expression of MGMT, RAD51, and other genes in association with decreased promoter H3K9 acetylation (H3K9Ac) and increased H3K9 tri-methylation (H3K9me3). Consistent with these data, RBBP4 interacts with CBP/p300 to form a chromatin-modifying complex that binds within the promoter of MGMT, RAD51, and perhaps other genes. Globally, RBBP4 positively and negatively regulates genes involved in critical cellular functions including tumorigenesis. The RBBP4/CBP/p300 complex may provide an interesting target for developing therapy-sensitizing strategies for GBM and other tumors.
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Affiliation(s)
- Gaspar J Kitange
- Department of Radiation Oncology, Mayo Clinic, Rochester, MN 55905, USA.
| | - Ann C Mladek
- Department of Radiation Oncology, Mayo Clinic, Rochester, MN 55905, USA
| | - Mark A Schroeder
- Department of Radiation Oncology, Mayo Clinic, Rochester, MN 55905, USA
| | - Jenny C Pokorny
- Department of Radiation Oncology, Mayo Clinic, Rochester, MN 55905, USA
| | - Brett L Carlson
- Department of Radiation Oncology, Mayo Clinic, Rochester, MN 55905, USA
| | - Yuji Zhang
- Department of Biostatistics and Bioinformatics, Mayo Clinic, Rochester, MN 55905, USA
| | - Asha A Nair
- Department of Biostatistics and Bioinformatics, Mayo Clinic, Rochester, MN 55905, USA
| | - Jeong-Heon Lee
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN 55905, USA
| | - Huihuang Yan
- Department of Biostatistics and Bioinformatics, Mayo Clinic, Rochester, MN 55905, USA
| | - Paul A Decker
- Department of Biostatistics and Bioinformatics, Mayo Clinic, Rochester, MN 55905, USA
| | - Zhiguo Zhang
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN 55905, USA
| | - Jann N Sarkaria
- Department of Radiation Oncology, Mayo Clinic, Rochester, MN 55905, USA
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Xipell E, Aragón T, Martínez-Velez N, Vera B, Idoate MA, Martínez-Irujo JJ, Garzón AG, Gonzalez-Huarriz M, Acanda AM, Jones C, Lang FF, Fueyo J, Gomez-Manzano C, Alonso MM. Endoplasmic reticulum stress-inducing drugs sensitize glioma cells to temozolomide through downregulation of MGMT, MPG, and Rad51. Neuro Oncol 2016; 18:1109-19. [PMID: 26951384 DOI: 10.1093/neuonc/now022] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2015] [Accepted: 01/29/2016] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Endoplasmic reticulum (ER) stress results from protein misfolding imbalance and has been postulated as a therapeutic strategy. ER stress activates the unfolded protein response which leads to a complex cellular response, including the upregulation of aberrant protein degradation in the ER, with the goal of resolving that stress. O(6)-methylguanine DNA methyltransferase (MGMT), N-methylpurine DNA glycosylase (MPG), and Rad51 are DNA damage repair proteins that mediate resistance to temozolomide in glioblastoma. In this work we sought to evaluate whether ER stress-inducing drugs were able to downmodulate DNA damage repair proteins and become candidates to combine with temozolomide. METHODS MTT assays were performed to evaluate the cytotoxicity of the treatments. The expression of proteins was evaluated using western blot and immunofluorescence. In vivo studies were performed using 2 orthotopic glioblastoma models in nude mice to evaluate the efficacy of the treatments. All statistical tests were 2-sided. RESULTS Treatment of glioblastoma cells with ER stress-inducing drugs leads to downregulation of MGMT, MPG, and Rad51. Inhibition of ER stress through pharmacological treatment resulted in rescue of MGMT, MPG, and Rad51 protein levels. Moreover, treatment of glioblastoma cells with salinomycin, an ER stress-inducing drug, and temozolomide resulted in enhanced DNA damage and a synergistic antitumor effect in vitro. Of importance, treatment with salinomycin/temozolomide resulted in a significant antiglioma effect in 2 aggressive orthotopic intracranial brain tumor models. CONCLUSIONS These findings provide a strong rationale for combining temozolomide with ER stress-inducing drugs as an alternative therapeutic strategy for glioblastoma.
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Affiliation(s)
- Enric Xipell
- Department of Medical Oncology, University Hospital of Navarra, Pamplona, Navarra, Spain (E.X., N.M.-V, B.V., M.G.-H, A.M.A, M.M.A); Department of Hepatology, Foundation for Applied Medical Research, Pamplona, Navarra, Spain (T.A.); Department of Pathology, University Hospital of Navarra, Pamplona, Navarra, Spain (M.A.I); Department of Biochemistry, University of Navarra, Pamplona, Navarra, Spain (J.J.M.-I, A.G.G); Divisions of Molecular Pathology and Cancer Therapeutics, The Institute of Cancer Research, London, UK (C.J.); Brain Tumor Center, The University of Texas MD Anderson Cancer Center, Houston, Texas (F.F.L, C.G.-M., J.F.)
| | - Tomás Aragón
- Department of Medical Oncology, University Hospital of Navarra, Pamplona, Navarra, Spain (E.X., N.M.-V, B.V., M.G.-H, A.M.A, M.M.A); Department of Hepatology, Foundation for Applied Medical Research, Pamplona, Navarra, Spain (T.A.); Department of Pathology, University Hospital of Navarra, Pamplona, Navarra, Spain (M.A.I); Department of Biochemistry, University of Navarra, Pamplona, Navarra, Spain (J.J.M.-I, A.G.G); Divisions of Molecular Pathology and Cancer Therapeutics, The Institute of Cancer Research, London, UK (C.J.); Brain Tumor Center, The University of Texas MD Anderson Cancer Center, Houston, Texas (F.F.L, C.G.-M., J.F.)
| | - Naiara Martínez-Velez
- Department of Medical Oncology, University Hospital of Navarra, Pamplona, Navarra, Spain (E.X., N.M.-V, B.V., M.G.-H, A.M.A, M.M.A); Department of Hepatology, Foundation for Applied Medical Research, Pamplona, Navarra, Spain (T.A.); Department of Pathology, University Hospital of Navarra, Pamplona, Navarra, Spain (M.A.I); Department of Biochemistry, University of Navarra, Pamplona, Navarra, Spain (J.J.M.-I, A.G.G); Divisions of Molecular Pathology and Cancer Therapeutics, The Institute of Cancer Research, London, UK (C.J.); Brain Tumor Center, The University of Texas MD Anderson Cancer Center, Houston, Texas (F.F.L, C.G.-M., J.F.)
| | - Beatriz Vera
- Department of Medical Oncology, University Hospital of Navarra, Pamplona, Navarra, Spain (E.X., N.M.-V, B.V., M.G.-H, A.M.A, M.M.A); Department of Hepatology, Foundation for Applied Medical Research, Pamplona, Navarra, Spain (T.A.); Department of Pathology, University Hospital of Navarra, Pamplona, Navarra, Spain (M.A.I); Department of Biochemistry, University of Navarra, Pamplona, Navarra, Spain (J.J.M.-I, A.G.G); Divisions of Molecular Pathology and Cancer Therapeutics, The Institute of Cancer Research, London, UK (C.J.); Brain Tumor Center, The University of Texas MD Anderson Cancer Center, Houston, Texas (F.F.L, C.G.-M., J.F.)
| | - Miguel Angel Idoate
- Department of Medical Oncology, University Hospital of Navarra, Pamplona, Navarra, Spain (E.X., N.M.-V, B.V., M.G.-H, A.M.A, M.M.A); Department of Hepatology, Foundation for Applied Medical Research, Pamplona, Navarra, Spain (T.A.); Department of Pathology, University Hospital of Navarra, Pamplona, Navarra, Spain (M.A.I); Department of Biochemistry, University of Navarra, Pamplona, Navarra, Spain (J.J.M.-I, A.G.G); Divisions of Molecular Pathology and Cancer Therapeutics, The Institute of Cancer Research, London, UK (C.J.); Brain Tumor Center, The University of Texas MD Anderson Cancer Center, Houston, Texas (F.F.L, C.G.-M., J.F.)
| | - Juan José Martínez-Irujo
- Department of Medical Oncology, University Hospital of Navarra, Pamplona, Navarra, Spain (E.X., N.M.-V, B.V., M.G.-H, A.M.A, M.M.A); Department of Hepatology, Foundation for Applied Medical Research, Pamplona, Navarra, Spain (T.A.); Department of Pathology, University Hospital of Navarra, Pamplona, Navarra, Spain (M.A.I); Department of Biochemistry, University of Navarra, Pamplona, Navarra, Spain (J.J.M.-I, A.G.G); Divisions of Molecular Pathology and Cancer Therapeutics, The Institute of Cancer Research, London, UK (C.J.); Brain Tumor Center, The University of Texas MD Anderson Cancer Center, Houston, Texas (F.F.L, C.G.-M., J.F.)
| | - Antonia García Garzón
- Department of Medical Oncology, University Hospital of Navarra, Pamplona, Navarra, Spain (E.X., N.M.-V, B.V., M.G.-H, A.M.A, M.M.A); Department of Hepatology, Foundation for Applied Medical Research, Pamplona, Navarra, Spain (T.A.); Department of Pathology, University Hospital of Navarra, Pamplona, Navarra, Spain (M.A.I); Department of Biochemistry, University of Navarra, Pamplona, Navarra, Spain (J.J.M.-I, A.G.G); Divisions of Molecular Pathology and Cancer Therapeutics, The Institute of Cancer Research, London, UK (C.J.); Brain Tumor Center, The University of Texas MD Anderson Cancer Center, Houston, Texas (F.F.L, C.G.-M., J.F.)
| | - Marisol Gonzalez-Huarriz
- Department of Medical Oncology, University Hospital of Navarra, Pamplona, Navarra, Spain (E.X., N.M.-V, B.V., M.G.-H, A.M.A, M.M.A); Department of Hepatology, Foundation for Applied Medical Research, Pamplona, Navarra, Spain (T.A.); Department of Pathology, University Hospital of Navarra, Pamplona, Navarra, Spain (M.A.I); Department of Biochemistry, University of Navarra, Pamplona, Navarra, Spain (J.J.M.-I, A.G.G); Divisions of Molecular Pathology and Cancer Therapeutics, The Institute of Cancer Research, London, UK (C.J.); Brain Tumor Center, The University of Texas MD Anderson Cancer Center, Houston, Texas (F.F.L, C.G.-M., J.F.)
| | - Arlet M Acanda
- Department of Medical Oncology, University Hospital of Navarra, Pamplona, Navarra, Spain (E.X., N.M.-V, B.V., M.G.-H, A.M.A, M.M.A); Department of Hepatology, Foundation for Applied Medical Research, Pamplona, Navarra, Spain (T.A.); Department of Pathology, University Hospital of Navarra, Pamplona, Navarra, Spain (M.A.I); Department of Biochemistry, University of Navarra, Pamplona, Navarra, Spain (J.J.M.-I, A.G.G); Divisions of Molecular Pathology and Cancer Therapeutics, The Institute of Cancer Research, London, UK (C.J.); Brain Tumor Center, The University of Texas MD Anderson Cancer Center, Houston, Texas (F.F.L, C.G.-M., J.F.)
| | - Chris Jones
- Department of Medical Oncology, University Hospital of Navarra, Pamplona, Navarra, Spain (E.X., N.M.-V, B.V., M.G.-H, A.M.A, M.M.A); Department of Hepatology, Foundation for Applied Medical Research, Pamplona, Navarra, Spain (T.A.); Department of Pathology, University Hospital of Navarra, Pamplona, Navarra, Spain (M.A.I); Department of Biochemistry, University of Navarra, Pamplona, Navarra, Spain (J.J.M.-I, A.G.G); Divisions of Molecular Pathology and Cancer Therapeutics, The Institute of Cancer Research, London, UK (C.J.); Brain Tumor Center, The University of Texas MD Anderson Cancer Center, Houston, Texas (F.F.L, C.G.-M., J.F.)
| | - Frederick F Lang
- Department of Medical Oncology, University Hospital of Navarra, Pamplona, Navarra, Spain (E.X., N.M.-V, B.V., M.G.-H, A.M.A, M.M.A); Department of Hepatology, Foundation for Applied Medical Research, Pamplona, Navarra, Spain (T.A.); Department of Pathology, University Hospital of Navarra, Pamplona, Navarra, Spain (M.A.I); Department of Biochemistry, University of Navarra, Pamplona, Navarra, Spain (J.J.M.-I, A.G.G); Divisions of Molecular Pathology and Cancer Therapeutics, The Institute of Cancer Research, London, UK (C.J.); Brain Tumor Center, The University of Texas MD Anderson Cancer Center, Houston, Texas (F.F.L, C.G.-M., J.F.)
| | - Juan Fueyo
- Department of Medical Oncology, University Hospital of Navarra, Pamplona, Navarra, Spain (E.X., N.M.-V, B.V., M.G.-H, A.M.A, M.M.A); Department of Hepatology, Foundation for Applied Medical Research, Pamplona, Navarra, Spain (T.A.); Department of Pathology, University Hospital of Navarra, Pamplona, Navarra, Spain (M.A.I); Department of Biochemistry, University of Navarra, Pamplona, Navarra, Spain (J.J.M.-I, A.G.G); Divisions of Molecular Pathology and Cancer Therapeutics, The Institute of Cancer Research, London, UK (C.J.); Brain Tumor Center, The University of Texas MD Anderson Cancer Center, Houston, Texas (F.F.L, C.G.-M., J.F.)
| | - Candelaria Gomez-Manzano
- Department of Medical Oncology, University Hospital of Navarra, Pamplona, Navarra, Spain (E.X., N.M.-V, B.V., M.G.-H, A.M.A, M.M.A); Department of Hepatology, Foundation for Applied Medical Research, Pamplona, Navarra, Spain (T.A.); Department of Pathology, University Hospital of Navarra, Pamplona, Navarra, Spain (M.A.I); Department of Biochemistry, University of Navarra, Pamplona, Navarra, Spain (J.J.M.-I, A.G.G); Divisions of Molecular Pathology and Cancer Therapeutics, The Institute of Cancer Research, London, UK (C.J.); Brain Tumor Center, The University of Texas MD Anderson Cancer Center, Houston, Texas (F.F.L, C.G.-M., J.F.)
| | - Marta M Alonso
- Department of Medical Oncology, University Hospital of Navarra, Pamplona, Navarra, Spain (E.X., N.M.-V, B.V., M.G.-H, A.M.A, M.M.A); Department of Hepatology, Foundation for Applied Medical Research, Pamplona, Navarra, Spain (T.A.); Department of Pathology, University Hospital of Navarra, Pamplona, Navarra, Spain (M.A.I); Department of Biochemistry, University of Navarra, Pamplona, Navarra, Spain (J.J.M.-I, A.G.G); Divisions of Molecular Pathology and Cancer Therapeutics, The Institute of Cancer Research, London, UK (C.J.); Brain Tumor Center, The University of Texas MD Anderson Cancer Center, Houston, Texas (F.F.L, C.G.-M., J.F.)
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Hyper-active non-homologous end joining selects for synthetic lethality resistant and pathological Fanconi anemia hematopoietic stem and progenitor cells. Sci Rep 2016; 6:22167. [PMID: 26916217 PMCID: PMC4768158 DOI: 10.1038/srep22167] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2015] [Accepted: 02/09/2016] [Indexed: 12/20/2022] Open
Abstract
The prominent role of Fanconi anemia (FA) proteins involves homologous recombination (HR) repair. Poly[ADP-ribose] polymerase1 (PARP1) functions in multiple cellular processes including DNA repair and PARP inhibition is an emerging targeted therapy for cancer patients deficient in HR. Here we show that PARP1 activation in hematopoietic stem and progenitor cells (HSPCs) in response to genotoxic or oxidative stress attenuates HSPC exhaustion. Mechanistically, PARP1 controls the balance between HR and non-homologous end joining (NHEJ) in double strand break (DSB) repair by preventing excessive NHEJ. Disruption of the FA core complex skews PARP1 function in DSB repair and led to hyper-active NHEJ in Fanca−/− or Fancc−/− HSPCs. Re-expression of PARP1 rescues the hyper-active NHEJ phenotype in Brca1−/−Parp1−/− but less effective in Fanca−/−Parp1−/− cells. Inhibition of NHEJ prevents myeloid/erythroid pathologies associated with synthetic lethality. Our results suggest that hyper-active NHEJ may select for “synthetic lethality” resistant and pathological HSPCs.
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LAN FENGMING, YANG YANG, HAN JING, WU QIAOLI, YU HUIMING, YUE XIAO. Sulforaphane reverses chemo-resistance to temozolomide in glioblastoma cells by NF-κB-dependent pathway downregulating MGMT expression. Int J Oncol 2015; 48:559-68. [DOI: 10.3892/ijo.2015.3271] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2015] [Accepted: 11/05/2015] [Indexed: 11/06/2022] Open
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Gill SJ, Travers J, Pshenichnaya I, Kogera FA, Barthorpe S, Mironenko T, Richardson L, Benes CH, Stratton MR, McDermott U, Jackson SP, Garnett MJ. Combinations of PARP Inhibitors with Temozolomide Drive PARP1 Trapping and Apoptosis in Ewing's Sarcoma. PLoS One 2015; 10:e0140988. [PMID: 26505995 PMCID: PMC4624427 DOI: 10.1371/journal.pone.0140988] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Accepted: 10/02/2015] [Indexed: 11/18/2022] Open
Abstract
Ewing's sarcoma is a malignant pediatric bone tumor with a poor prognosis for patients with metastatic or recurrent disease. Ewing's sarcoma cells are acutely hypersensitive to poly (ADP-ribose) polymerase (PARP) inhibition and this is being evaluated in clinical trials, although the mechanism of hypersensitivity has not been directly addressed. PARP inhibitors have efficacy in tumors with BRCA1/2 mutations, which confer deficiency in DNA double-strand break (DSB) repair by homologous recombination (HR). This drives dependence on PARP1/2 due to their function in DNA single-strand break (SSB) repair. PARP inhibitors are also cytotoxic through inhibiting PARP1/2 auto-PARylation, blocking PARP1/2 release from substrate DNA. Here, we show that PARP inhibitor sensitivity in Ewing's sarcoma cells is not through an apparent defect in DNA repair by HR, but through hypersensitivity to trapped PARP1-DNA complexes. This drives accumulation of DNA damage during replication, ultimately leading to apoptosis. We also show that the activity of PARP inhibitors is potentiated by temozolomide in Ewing's sarcoma cells and is associated with enhanced trapping of PARP1-DNA complexes. Furthermore, through mining of large-scale drug sensitivity datasets, we identify a subset of glioma, neuroblastoma and melanoma cell lines as hypersensitive to the combination of temozolomide and PARP inhibition, potentially identifying new avenues for therapeutic intervention. These data provide insights into the anti-cancer activity of PARP inhibitors with implications for the design of treatment for Ewing's sarcoma patients with PARP inhibitors.
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Affiliation(s)
- Sonja J. Gill
- Wellcome Trust Sanger Institute, Hinxton, United Kingdom
| | - Jon Travers
- The Wellcome Trust/Cancer Research UK Gurdon Institute and Department of Biochemistry, University of Cambridge, Cambridge, United Kingdom
| | | | | | - Syd Barthorpe
- Wellcome Trust Sanger Institute, Hinxton, United Kingdom
| | | | | | - Cyril H. Benes
- Massachusetts General Hospital Cancer Center, Harvard Medical School, Charlestown, Massachusetts, United States of America
| | | | | | - Stephen P. Jackson
- Wellcome Trust Sanger Institute, Hinxton, United Kingdom
- The Wellcome Trust/Cancer Research UK Gurdon Institute and Department of Biochemistry, University of Cambridge, Cambridge, United Kingdom
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49
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Konstantinopoulos PA, Ceccaldi R, Shapiro GI, D'Andrea AD. Homologous Recombination Deficiency: Exploiting the Fundamental Vulnerability of Ovarian Cancer. Cancer Discov 2015. [PMID: 26463832 DOI: 10.1158/2159-8290.cd-15-0714] [] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
UNLABELLED Approximately 50% of epithelial ovarian cancers (EOC) exhibit defective DNA repair via homologous recombination (HR) due to genetic and epigenetic alterations of HR pathway genes. Defective HR is an important therapeutic target in EOC as exemplified by the efficacy of platinum analogues in this disease, as well as the advent of PARP inhibitors, which exhibit synthetic lethality when applied to HR-deficient cells. Here, we describe the genotypic and phenotypic characteristics of HR-deficient EOCs, discuss current and emerging approaches for targeting these tumors, and present challenges associated with these approaches, focusing on development and overcoming resistance. SIGNIFICANCE Defective DNA repair via HR is a pivotal vulnerability of EOC, particularly of the high-grade serous histologic subtype. Targeting defective HR offers the unique opportunity of exploiting molecular differences between tumor and normal cells, thereby inducing cancer-specific synthetic lethality; the promise and challenges of these approaches in ovarian cancer are discussed in this review.
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Affiliation(s)
- Panagiotis A Konstantinopoulos
- Department of Medical Oncology, Medical Gynecologic Oncology Program, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts. Center for DNA Damage and Repair, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts.
| | - Raphael Ceccaldi
- Center for DNA Damage and Repair, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts. Department of Radiation Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts
| | - Geoffrey I Shapiro
- Center for DNA Damage and Repair, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts. Department of Medical Oncology, Early Drug Development Center, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts
| | - Alan D D'Andrea
- Center for DNA Damage and Repair, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts. Department of Radiation Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts.
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50
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Konstantinopoulos PA, Ceccaldi R, Shapiro GI, D'Andrea AD. Homologous Recombination Deficiency: Exploiting the Fundamental Vulnerability of Ovarian Cancer. Cancer Discov 2015; 5:1137-54. [PMID: 26463832 DOI: 10.1158/2159-8290.cd-15-0714] [Citation(s) in RCA: 594] [Impact Index Per Article: 66.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2015] [Accepted: 08/11/2015] [Indexed: 12/14/2022]
Abstract
UNLABELLED Approximately 50% of epithelial ovarian cancers (EOC) exhibit defective DNA repair via homologous recombination (HR) due to genetic and epigenetic alterations of HR pathway genes. Defective HR is an important therapeutic target in EOC as exemplified by the efficacy of platinum analogues in this disease, as well as the advent of PARP inhibitors, which exhibit synthetic lethality when applied to HR-deficient cells. Here, we describe the genotypic and phenotypic characteristics of HR-deficient EOCs, discuss current and emerging approaches for targeting these tumors, and present challenges associated with these approaches, focusing on development and overcoming resistance. SIGNIFICANCE Defective DNA repair via HR is a pivotal vulnerability of EOC, particularly of the high-grade serous histologic subtype. Targeting defective HR offers the unique opportunity of exploiting molecular differences between tumor and normal cells, thereby inducing cancer-specific synthetic lethality; the promise and challenges of these approaches in ovarian cancer are discussed in this review.
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Affiliation(s)
- Panagiotis A Konstantinopoulos
- Department of Medical Oncology, Medical Gynecologic Oncology Program, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts. Center for DNA Damage and Repair, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts.
| | - Raphael Ceccaldi
- Center for DNA Damage and Repair, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts. Department of Radiation Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts
| | - Geoffrey I Shapiro
- Center for DNA Damage and Repair, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts. Department of Medical Oncology, Early Drug Development Center, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts
| | - Alan D D'Andrea
- Center for DNA Damage and Repair, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts. Department of Radiation Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts.
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