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Qiu L, Li R, Wang Y, Lu Z, Tu Z, Liu H. PTEN inhibition enhances sensitivity of ovarian cancer cells to the poly (ADP-ribose) polymerase inhibitor by suppressing the MRE11-RAD50-NBN complex. Br J Cancer 2024; 131:577-588. [PMID: 38866962 PMCID: PMC11300449 DOI: 10.1038/s41416-024-02749-w] [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: 09/21/2023] [Revised: 05/29/2024] [Accepted: 06/03/2024] [Indexed: 06/14/2024] Open
Abstract
BACKGROUND Poly (ADP-ribose) polymerase inhibitors (PARPis) can effectively treat ovarian cancer patients with defective homologous recombination (HR). Loss or dysfunction of PTEN, a typical tumour suppressor, impairs double-strand break (DSB) repair. Hence, we explored the possibility of inhibiting PTEN to induce HR deficiency (HRD) for PARPi application. METHODS Functional studies using PTEN inhibitor VO-OHpic and PARPi olaparib were performed to explore the molecular mechanisms in vitro and in vivo. RESULTS In this study, the combination of VO-OHpic with olaparib exhibited synergistic inhibitory effects on ovarian cancer cells was demonstrated. Furthermore, VO-OHpic was shown to enhance DSBs by reducing nuclear expression of PTEN and inhibiting HR repair through the modulation of MRE11-RAD50-NBN (MRN) complex, critical for DSB repair. TCGA and GTEx analysis revealed a strong correlation between PTEN and MRN in ovarian cancer. Mechanistic studies indicated that VO-OHpic reduced expression of MRN, likely by decreasing PTEN/E2F1-mediated transcription. Moreover, PTEN-knockdown inhibited expression of MRN, increased sensitivities to olaparib, and induced DSBs. In vivo experiments showed that the combination of VO-OHpic with olaparib exhibited enhanced inhibitory effects on tumour growth. CONCLUSIONS Collectively, this study highlights the potential of PTEN inhibitors in combination therapy with PARPis to create HRD for HRD-negative ovarian cancers.
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Affiliation(s)
- Lipeng Qiu
- School of Life Sciences, Jiangsu University, Zhenjiang, 212013, Jiangsu, China
| | - Ruyan Li
- School of Life Sciences, Jiangsu University, Zhenjiang, 212013, Jiangsu, China
- School of Health Medicine, Nantong Institute of Technology, Nantong, 226000, Jiangsu, China
| | - Yue Wang
- School of Life Sciences, Jiangsu University, Zhenjiang, 212013, Jiangsu, China
| | - Ziwen Lu
- School of Life Sciences, Jiangsu University, Zhenjiang, 212013, Jiangsu, China
| | - Zhigang Tu
- School of Life Sciences, Jiangsu University, Zhenjiang, 212013, Jiangsu, China.
| | - Hanqing Liu
- School of Pharmacy, Jiangsu University, Zhenjiang, 212013, Jiangsu, China.
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Piha-Paul SA, Tseng C, Leung CH, Yuan Y, Karp DD, Subbiah V, Hong D, Fu S, Naing A, Rodon J, Javle M, Ajani JA, Raghav KP, Somaiah N, Mills GB, Tsimberidou AM, Zheng X, Chen K, Meric-Bernstam F. Phase II study of talazoparib in advanced cancers with BRCA1/2, DNA repair, and PTEN alterations. NPJ Precis Oncol 2024; 8:166. [PMID: 39085400 PMCID: PMC11291882 DOI: 10.1038/s41698-024-00634-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2023] [Accepted: 07/09/2024] [Indexed: 08/02/2024] Open
Abstract
Cancer cells with BRCA1/2 deficiencies are sensitive to poly (ADP-ribose) polymerase (PARP) inhibitors. We evaluated the efficacy of talazoparib in DNA-Damage Repair (DDR)-altered patients. In this phase II trial, patients were enrolled onto one of four cohorts based on molecular alterations: (1) somatic BRCA1/2, (2) other homologous recombination repair pathway, (3) PTEN and (4) germline BRCA1/2. The primary endpoint was a clinical benefit rate (CBR): complete response, partial response or stable disease ≥24 weeks. 79 patients with a median of 4 lines of therapy were enrolled. CBR for cohorts 1-4 were: 32.5%, 19.7%, 9.4% and 30.6%, respectively. PTEN mutations correlated with reduced survival and a trend towards shorter time to progression.Talazoparib demonstrated clinical benefit in selected DDR-altered patients. PTEN mutations/loss patients derived limited clinical benefit. Further study is needed to determine whether PTEN is prognostic or predictive of response to PARP inhibitors.
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Affiliation(s)
- Sarina A Piha-Paul
- Department of Investigational Cancer Therapeutics (A Phase I Clinical Trials Program), University of Texas MD Anderson Cancer Center, Houston, TX, USA.
| | - Chieh Tseng
- Department of Investigational Cancer Therapeutics (A Phase I Clinical Trials Program), University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Cheuk Hong Leung
- Department of Biostatistics, University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Ying Yuan
- Department of Biostatistics, University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Daniel D Karp
- Department of Investigational Cancer Therapeutics (A Phase I Clinical Trials Program), University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Vivek Subbiah
- Department of Investigational Cancer Therapeutics (A Phase I Clinical Trials Program), University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - David Hong
- Department of Investigational Cancer Therapeutics (A Phase I Clinical Trials Program), University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Siqing Fu
- Department of Investigational Cancer Therapeutics (A Phase I Clinical Trials Program), University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Aung Naing
- Department of Investigational Cancer Therapeutics (A Phase I Clinical Trials Program), University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Jordi Rodon
- Department of Investigational Cancer Therapeutics (A Phase I Clinical Trials Program), University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Milind Javle
- Department of Gastrointestinal Medical Oncology, University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Jaffer A Ajani
- Department of Gastrointestinal Medical Oncology, University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Kanwal P Raghav
- Department of Gastrointestinal Medical Oncology, University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Neeta Somaiah
- Department of Sarcoma Medical Oncology, University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Gordon B Mills
- Knight Cancer Institute, Oregon Health Sciences University, Portland, OR, USA
| | - Apostolia M Tsimberidou
- Department of Investigational Cancer Therapeutics (A Phase I Clinical Trials Program), University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Xiaofeng Zheng
- Department of Bioinformatics and Computational Biology, University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Ken Chen
- Department of Bioinformatics and Computational Biology, University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Funda Meric-Bernstam
- Department of Investigational Cancer Therapeutics (A Phase I Clinical Trials Program), University of Texas MD Anderson Cancer Center, Houston, TX, USA
- Department of Breast Surgical Oncology, University of Texas MD Anderson Cancer Center, Houston, TX, USA
- The Sheikh Khalifa Bin Zayed Al Nahyan Institute for Personalized Cancer Therapy, University of Texas MD Anderson Cancer Center, Houston, TX, USA
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3
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Ma MC, Lavi ES, Altwerger G, Lin ZP, Ratner ES. Predictive modeling of gene mutations for the survival outcomes of epithelial ovarian cancer patients. PLoS One 2024; 19:e0305273. [PMID: 38976671 PMCID: PMC11230535 DOI: 10.1371/journal.pone.0305273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Accepted: 05/27/2024] [Indexed: 07/10/2024] Open
Abstract
Epithelial ovarian cancer (EOC) has a low overall survival rate, largely due to frequent recurrence and acquiring resistance to platinum-based chemotherapy. EOC with homologous recombination (HR) deficiency has increased sensitivity to platinum-based chemotherapy because platinum-induced DNA damage cannot be repaired. Mutations in genes involved in the HR pathway are thought to be strongly correlated with favorable response to treatment. Patients with these mutations have better prognosis and an improved survival rate. On the other hand, mutations in non-HR genes in EOC are associated with increased chemoresistance and poorer prognosis. For this reason, accurate predictions in response to treatment and overall survival remain challenging. Thus, analyses of 360 EOC cases on NCI's The Cancer Genome Atlas (TCGA) program were conducted to identify novel gene mutation signatures that were strongly correlated with overall survival. We found that a considerable portion of EOC cases exhibited multiple and overlapping mutations in a panel of 31 genes. Using logistical regression modeling on mutational profiles and patient survival data from TCGA, we determined whether specific sets of deleterious gene mutations in EOC patients had impacts on patient survival. Our results showed that six genes that were strongly correlated with an increased survival time are BRCA1, NBN, BRIP1, RAD50, PTEN, and PMS2. In addition, our analysis shows that six genes that were strongly correlated with a decreased survival time are FANCE, FOXM1, KRAS, FANCD2, TTN, and CSMD3. Furthermore, Kaplan-Meier survival analysis of 360 patients stratified by these positive and negative gene mutation signatures corroborated that our regression model outperformed the conventional HR genes-based classification and prediction of survival outcomes. Collectively, our findings suggest that EOC exhibits unique mutation signatures beyond HR gene mutations. Our approach can identify a novel panel of gene mutations that helps improve the prediction of treatment outcomes and overall survival for EOC patients.
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Affiliation(s)
- Mirielle C Ma
- Department of Obstetrics, Gynecology, and Reproductive Sciences, Yale University School of Medicine, New Haven, Connecticut, United States of America
| | - Ethan S Lavi
- Department of Obstetrics, Gynecology, and Reproductive Sciences, Yale University School of Medicine, New Haven, Connecticut, United States of America
| | - Gary Altwerger
- Department of Obstetrics, Gynecology, and Reproductive Sciences, Yale University School of Medicine, New Haven, Connecticut, United States of America
| | - Z Ping Lin
- Department of Obstetrics, Gynecology, and Reproductive Sciences, Yale University School of Medicine, New Haven, Connecticut, United States of America
| | - Elena S Ratner
- Department of Obstetrics, Gynecology, and Reproductive Sciences, Yale University School of Medicine, New Haven, Connecticut, United States of America
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Richard SA. Advances in synthetic lethality modalities for glioblastoma multiforme. Open Med (Wars) 2024; 19:20240981. [PMID: 38868315 PMCID: PMC11167713 DOI: 10.1515/med-2024-0981] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2024] [Revised: 04/24/2024] [Accepted: 05/20/2024] [Indexed: 06/14/2024] Open
Abstract
Glioblastoma multiforme (GBM) is characterized by a high mortality rate, high resistance to cytotoxic chemotherapy, and radiotherapy due to its highly aggressive nature. The pathophysiology of GBM is characterized by multifarious genetic abrasions that deactivate tumor suppressor genes, induce transforming genes, and over-secretion of pro-survival genes, resulting in oncogene sustainability. Synthetic lethality is a destructive process in which the episode of a single genetic consequence is tolerable for cell survival, while co-episodes of multiple genetic consequences lead to cell death. This targeted drug approach, centered on the genetic concept of synthetic lethality, is often selective for DNA repair-deficient GBM cells with restricted toxicity to normal tissues. DNA repair pathways are key modalities in the generation, treatment, and drug resistance of cancers, as DNA damage plays a dual role as a creator of oncogenic mutations and a facilitator of cytotoxic genomic instability. Although several research advances have been made in synthetic lethality modalities for GBM therapy, no review article has summarized these therapeutic modalities. Thus, this review focuses on the innovative advances in synthetic lethality modalities for GBM therapy.
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Affiliation(s)
- Seidu A. Richard
- Department of Medicine, Princefield University, P. O. Box MA128, Volta Region, Ho, Ghana
- Institute of Neuroscience, Third Affiliated Hospital, Zhengzhou University, Zhengzhou, 450052, China
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5
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Hitomi M, Venegas J, Kang SC, Eng C. Differential cell cycle checkpoint evasion by PTEN germline mutations associated with dichotomous phenotypes of cancer versus autism spectrum disorder. Oncogene 2023; 42:3698-3707. [PMID: 37907589 DOI: 10.1038/s41388-023-02867-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 09/29/2023] [Accepted: 10/10/2023] [Indexed: 11/02/2023]
Abstract
Individuals with a PTEN germline mutation receive the molecular diagnosis of PTEN hamartoma tumor syndrome (PHTS). PHTS displays a complex spectrum of clinical phenotypes including harmartomas, predisposition to cancers, and autism spectrum disorder (ASD). Clear-cut genotype-phenotype correlations are yet to be established due to insufficient information on the PTEN function being impacted by mutations. To fill this knowledge gap, we compared functional impacts of two selected missense PTEN mutant alleles, G132D and M134R, each respectively being associated with distinct clinical phenotype, ASD or thyroid cancer without ASD using gene-edited human induced pluripotent stem cells (hiPSCs). In homozygous hiPSCs, PTEN expression was severely reduced by M134R mutation due to shortened protein half-life. G132D suppressed PTEN expression to a lesser extent than Μ134R mutation without altering protein half-life. When challenged with γ-irradiation, G132D heterozygous cells exited radiation-induced G2 arrest earlier than wildtype and M134R heterozygous hiPSCs despite the similar DNA damage levels as the latter two. Immunoblotting analyses suggested that γ-irradiation induced apoptosis in G132D heterozygous cells to lesser degrees than in the hiPSCs of other genotypes. These data suggest that ASD-associated G132D allele promotes genome instability by premature cell cycle reentry with incomplete DNA repair.
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Affiliation(s)
- Masahiro Hitomi
- Genomic Medicine Institute, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, 44195, USA
- Department of Molecular Medicine, The Cleveland Clinic Lerner College of Medicine of Case Western Reserve University, Cleveland, OH, 44195, USA
| | - Juan Venegas
- Genomic Medicine Institute, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, 44195, USA
| | - Shin Chung Kang
- Genomic Medicine Institute, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, 44195, USA
| | - Charis Eng
- Genomic Medicine Institute, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, 44195, USA.
- Department of Molecular Medicine, The Cleveland Clinic Lerner College of Medicine of Case Western Reserve University, Cleveland, OH, 44195, USA.
- Center for Personalized Genetic Healthcare, Medical Specialties Institute, Cleveland Clinic, Cleveland, OH, 44195, USA.
- Department of Genetics and Genome Science, Case Western Reserve University School of Medicine, Cleveland, OH, 44116, USA.
- Case Comprehensive Cancer Center, Case Western Reserve University School of Medicine, Cleveland, OH, 44116, USA.
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6
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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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7
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Keane F, Bajwa R, Selenica P, Park W, Roehrl MH, Reis-Filho JS, Mandelker D, O'Reilly EM. Dramatic, durable response to therapy in gBRCA2-mutated pancreas neuroendocrine carcinoma: opportunity and challenge. NPJ Precis Oncol 2023; 7:40. [PMID: 37087482 PMCID: PMC10122663 DOI: 10.1038/s41698-023-00376-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Accepted: 03/30/2023] [Indexed: 04/24/2023] Open
Abstract
Poorly differentiated pancreatic neuroendocrine tumors (PDNEC), are a subtype of pancreatic cancer encompassing both small cell and large cell neuroendocrine carcinoma subtypes, and are characterized as distinct in terms of biology and prognosis compared to the more common pancreatic adenocarcinoma. Until recently, there has been a paucity of data on the genomic features of this cancer type. We describe a male patient diagnosed with PDNEC and extensive metastatic disease in the liver at diagnosis. Genomic analysis demonstrated a germline pathogenic variant in BRCA2 with somatic loss-of-heterozygosity of the BRCA2 wild-type allele. Following a favorable response to platinum-based chemotherapy (and the addition of immunotherapy), the patient received maintenance therapy with olaparib, which resulted in a further reduction on follow-up imaging (Fig. 1). After seventeen months of systemic control with olaparib, the patient developed symptomatic central nervous system metastases, which harboured a BRCA2 reversion mutation. No other sites of disease progression were observed. Herein, we report an exceptional outcome through the incorporation of a personalized management approach for a patient with a pancreatic PDNEC, guided by comprehensive genomic sequencing.
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Affiliation(s)
- Fergus Keane
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
- David M. Rubenstein Center for Pancreatic Cancer Research, New York, NY, USA
| | - Raazi Bajwa
- David M. Rubenstein Center for Pancreatic Cancer Research, New York, NY, USA
- Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Pier Selenica
- Department of Pathology and Laboratory Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Wungki Park
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
- David M. Rubenstein Center for Pancreatic Cancer Research, New York, NY, USA
- Department of Medicine, Weill Cornell Medical College, New York, NY, USA
- Parker Institute for Cancer Immunotherapy, San Francisco, CA, USA
| | - Michael H Roehrl
- David M. Rubenstein Center for Pancreatic Cancer Research, New York, NY, USA
- Department of Pathology and Laboratory Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Jorge S Reis-Filho
- Department of Pathology and Laboratory Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Diana Mandelker
- David M. Rubenstein Center for Pancreatic Cancer Research, New York, NY, USA
- Parker Institute for Cancer Immunotherapy, San Francisco, CA, USA
- Diagnostic Molecular Genetics Laboratory, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Eileen M O'Reilly
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA.
- David M. Rubenstein Center for Pancreatic Cancer Research, New York, NY, USA.
- Department of Medicine, Weill Cornell Medical College, New York, NY, USA.
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8
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Pujade-Lauraine E, Brown J, Barnicle A, Wessen J, Lao-Sirieix P, Criscione SW, du Bois A, Lorusso D, Romero I, Petru E, Yoshida H, Vergote I, Colombo N, Hietanen S, Provansal M, Schmalfeldt B, Pignata S, Martín Lorente C, Berton D, Runnebaum IB, Ray-Coquard I. Homologous Recombination Repair Gene Mutations to Predict Olaparib Plus Bevacizumab Efficacy in the First-Line Ovarian Cancer PAOLA-1/ENGOT-ov25 Trial. JCO Precis Oncol 2023; 7:e2200258. [PMID: 36716415 PMCID: PMC9928987 DOI: 10.1200/po.22.00258] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
PURPOSE The PAOLA-1/ENGOT-ov25 trial of maintenance olaparib plus bevacizumab for newly diagnosed advanced high-grade ovarian cancer demonstrated a significant progression-free survival (PFS) benefit over placebo plus bevacizumab, particularly in patients with homologous recombination deficiency (HRD)-positive tumors. We explored whether mutations in non-BRCA1 or BRCA2 homologous recombination repair (non-BRCA HRRm) genes predicted benefit from olaparib plus bevacizumab in PAOLA-1. METHODS Eight hundred and six patients were randomly assigned (2:1). Tumors were analyzed using the Myriad MyChoice HRD Plus assay to assess non-BRCA HRRm and HRD status; HRD was based on a genomic instability score (GIS) of ≥ 42. In this exploratory analysis, PFS was assessed in patients harboring deleterious mutations using six non-BRCA HRR gene panels, three devised for this analysis and three previously published. RESULTS The non-BRCA HRRm prevalence ranged from 30 of 806 (3.7%) to 79 of 806 (9.8%) depending on the gene panel used, whereas 152 of 806 (18.9%) had non-BRCA1 or BRCA2 mutation HRD-positive tumors. The majority of tumors harboring non-BRCA HRRm had a low median GIS; however, a GIS of > 42 was observed for tumors with mutations in five HRR genes (BLM, BRIP1, RAD51C, PALB2, and RAD51D). Rates of gene-specific biallelic loss were variable (0% to 100%) in non-BRCA HRRm tumors relative to BRCA1-mutated (99%) or BRCA2-mutated (86%) tumors. Across all gene panels tested, hazard ratios for PFS (95% CI) ranged from 0.92 (0.51 to 1.73) to 1.83 (0.76 to 5.43). CONCLUSION Acknowledging limitations of small subgroup sizes, non-BRCA HRRm gene panels were not predictive of PFS benefit with maintenance olaparib plus bevacizumab versus placebo plus bevacizumab in PAOLA-1, irrespective of the gene panel tested. Current gene panels exploring HRRm should not be considered a substitute for HRD determined by BRCA mutation status and genomic instability testing in first-line high-grade ovarian cancer.
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Affiliation(s)
- Eric Pujade-Lauraine
- ARCAGY-GINECO, Paris, France,Eric Pujade-Lauraine, MD, 8 rue Lamennais, 75008 Paris, France; e-mail:
| | | | | | | | | | | | | | - Domenica Lorusso
- Fondazione IRCCS Istituto Nazionale Tumori, Milan and MITO, Italy
| | - Ignacio Romero
- Instituto Valenciano de Oncología, Valencia and GEICO, Spain
| | - Edgar Petru
- Universitätsklinik für Frauenheilkunde und Geburtshilfe der Med, Universität Graz, Graz and AGO, Austria
| | - Hiroyuki Yoshida
- Saitama Medical University International Medical Center, Saitama and GOTIC, Japan
| | - Ignace Vergote
- University Hospital Leuven, Leuven Cancer Institute, Leuven and BGOG, Belgium
| | - Nicoletta Colombo
- University of Milan-Bicocca and Istituto Europeo di Oncologia IRCCS, Milan and MANGO, Italy
| | | | | | | | - Sandro Pignata
- Istituto Nazionale Tumori IRCCS “Fondazione G. Pascale”, Naples and MITO, Italy
| | | | - Dominique Berton
- L'Institut de Cancérologie de l'Ouest (ICO), Center René Gauducheau, Saint Herblain and GINECO, France
| | - Ingo B. Runnebaum
- Jena University Hospital, Universitaets-Frauenklinik Jena and AGO, Germany
| | - Isabelle Ray-Coquard
- Center Léon Bérard and University Claude Bernard Lyon 1, Lyon and GINECO, France
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9
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Kim O, Butler M, Sergi Z, Robey RW, Zhang M, Chari R, Pang Y, Yu G, Zhang W, Song H, Davis D, Hawley RG, Wen X, Wang H, Quezado M, Tran B, Merchant M, Ranjan A, Furnari FB, Khan J, Gilbert MR, Ryan Miller C, Gottesman MM, Pommier Y, Wu J. Combined inhibition of topoisomerase I and poly(ADP-ribose) polymerase: A synergistic therapeutic strategy for glioblastoma with phosphatase and tensin homolog deficiency. Neurooncol Adv 2023; 5:vdad102. [PMID: 37706203 PMCID: PMC10496946 DOI: 10.1093/noajnl/vdad102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/15/2023] Open
Abstract
Background Deletions or loss-of-function mutations in phosphatase and tensin homolog (PTEN) are common in glioblastoma (GBM) and have been associated with defective DNA damage repair. Here we investigated whether PTEN deficiency presents a vulnerability to a simultaneous induction of DNA damage and suppression of repair mechanisms by combining topoisomerase I (TOP1) and PARP inhibitors. Methods Patient-derived GBM cells and isogenic PTEN-null and PTEN-WT glioma cells were treated with LMP400 (Indotecan), a novel non-camptothecin TOP1 inhibitor alone and in combination with a PARP inhibitor, Olaparib or Niraparib. RNAseq analysis was performed to identify treatment-induced dysregulated pathways. Results We found that GBM cells lacking PTEN expression are highly sensitive to LMP400; however, rescue of the PTEN expression reduces sensitivity to the treatment. Combining LMP400 with Niraparib leads to synergistic cytotoxicity by inducing G2/M arrest, DNA damage, suppression of homologous recombination-related proteins, and activation of caspase 3/7 activity significantly more in PTEN-null cells compared to PTEN-WT cells. LMP400 and Niraparib are not affected by ABCB1 and ABCG2, the major ATP-Binding Cassette (ABC) drug efflux transporters expressed at the blood-brain barrier (BBB), thus suggesting BBB penetration which is a prerequisite for potential brain tumor treatment. Animal studies confirmed both an anti-glioma effect and sufficient BBB penetration to prolong survival of mice treated with the drug combination. Conclusions Our findings provide a proof of concept for the combined treatment with LMP400 and Niraparib in a subset of GBM patients with PTEN deficiency.
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Affiliation(s)
- Olga Kim
- Neuro-Oncology Branch, Center for Cancer Research, NCI, NIH, Bethesda, Maryland, USA
| | - Madison Butler
- Neuro-Oncology Branch, Center for Cancer Research, NCI, NIH, Bethesda, Maryland, USA
| | - Zach Sergi
- Neuro-Oncology Branch, Center for Cancer Research, NCI, NIH, Bethesda, Maryland, USA
| | - Robert W Robey
- Laboratory of Cell Biology, Center for Cancer Research, NCI, NIH, Bethesda, Maryland, USA
| | - Meili Zhang
- Neuro-Oncology Branch, Center for Cancer Research, NCI, NIH, Bethesda, Maryland, USA
| | - Raj Chari
- Genome Modification Core laboratory, Leidos Biomedical Inc/ Frederick National Laboratory for Cancer Research, Frederick, Maryland, USA
| | - Ying Pang
- Neuro-Oncology Branch, Center for Cancer Research, NCI, NIH, Bethesda, Maryland, USA
| | - Guangyang Yu
- Neuro-Oncology Branch, Center for Cancer Research, NCI, NIH, Bethesda, Maryland, USA
| | - Wei Zhang
- Neuro-Oncology Branch, Center for Cancer Research, NCI, NIH, Bethesda, Maryland, USA
| | - Hua Song
- Neuro-Oncology Branch, Center for Cancer Research, NCI, NIH, Bethesda, Maryland, USA
| | - Dionne Davis
- Neuro-Oncology Branch, Center for Cancer Research, NCI, NIH, Bethesda, Maryland, USA
| | - Robert G Hawley
- Genetics Branch, Center for Cancer Research, NCI, NIH, Bethesda, Maryland, USA
| | - Xinyu Wen
- Genetics Branch, Center for Cancer Research, NCI, NIH, Bethesda, Maryland, USA
| | - Herui Wang
- Neuro-Oncology Branch, Center for Cancer Research, NCI, NIH, Bethesda, Maryland, USA
| | | | - Bao Tran
- Sequencing Facility, Leidos Biomedical Inc/ Frederick National Laboratory for Cancer Research, Frederick, Maryland, USA
| | - Mythili Merchant
- Neuro-Oncology Branch, Center for Cancer Research, NCI, NIH, Bethesda, Maryland, USA
| | - Alice Ranjan
- Neuro-Oncology Branch, Center for Cancer Research, NCI, NIH, Bethesda, Maryland, USA
| | - Frank B Furnari
- University of California at San Diego, School of Medicine, La Jolla, California, USA
| | - Javed Khan
- Genetics Branch, Center for Cancer Research, NCI, NIH, Bethesda, Maryland, USA
| | - Mark R Gilbert
- Neuro-Oncology Branch, Center for Cancer Research, NCI, NIH, Bethesda, Maryland, USA
| | | | - Michael M Gottesman
- Laboratory of Cell Biology, Center for Cancer Research, NCI, NIH, Bethesda, Maryland, USA
| | - Yves Pommier
- Center for Cancer Research, NCI, NIH, Bethesda, Maryland, USA
- Developmental Therapeutics Branch and Laboratory of Molecular Pharmacology, Center for Cancer Research, NCI, NIH, Bethesda, Maryland, USA
| | - Jing Wu
- Neuro-Oncology Branch, Center for Cancer Research, NCI, NIH, Bethesda, Maryland, USA
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Higa N, Akahane T, Yokoyama S, Makino R, Yonezawa H, Uchida H, Takajo T, Kirishima M, Hamada T, Noguchi N, Otsuji R, Kuga D, Nagasaka S, Yamahata H, Yamamoto J, Yoshimoto K, Tanimoto A, Hanaya R. Favorable prognostic impact of phosphatase and tensin homolog alterations in wild-type isocitrate dehydrogenase and telomerase reverse transcriptase promoter glioblastoma. Neurooncol Adv 2023; 5:vdad078. [PMID: 37528810 PMCID: PMC10390081 DOI: 10.1093/noajnl/vdad078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/03/2023] Open
Abstract
Background Telomerase reverse transcriptase promoter (TERTp) mutations are a biological marker of glioblastoma; however, the prognostic significance of TERTp mutational status is controversial. We evaluated this impact by retrospectively analyzing the outcomes of patients with isocitrate dehydrogenase (IDH)- and TERTp-wild-type glioblastomas. Methods Using custom next-generation sequencing, we analyzed 208 glioblastoma samples harboring wild-type IDH. Results TERTp mutations were detected in 143 samples (68.8%). The remaining 65 (31.2%) were TERTp-wild-type. Among the TERTp-wild-type glioblastoma samples, we observed a significant difference in median progression-free survival (18.6 and 11.4 months, respectively) and overall survival (not reached and 15.7 months, respectively) in patients with and without phosphatase and tensin homolog (PTEN) loss and/or mutation. Patients with TERTp-wild-type glioblastomas with PTEN loss and/or mutation were younger and had higher Karnofsky Performance Status scores than those without PTEN loss and/or mutation. We divided the patients with TERTp-wild-type into 3 clusters using unsupervised hierarchical clustering: Good (PTEN and TP53 alterations; lack of CDKN2A/B homozygous deletion and platelet-derived growth factor receptor alpha (PDGFRA) alterations), intermediate (PTEN alterations, CDKN2A/B homozygous deletion, lack of PDGFRA, and TP53 alterations), and poor (PDGFRA and TP53 alterations, CDKN2A/B homozygous deletion, and lack of PTEN alterations) outcomes. Kaplan-Meier survival analysis indicated that these clusters significantly correlated with the overall survival of TERTp-wild-type glioblastoma patients. Conclusions Here, we report that PTEN loss and/or mutation is the most useful marker for predicting favorable outcomes in patients with IDH- and TERTp-wild-type glioblastomas. The combination of 4 genes, PTEN, TP53, CDKN2A/B, and PDGFRA, is important for the molecular classification and individual prognosis of patients with IDH- and TERTp-wild-type glioblastomas.
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Affiliation(s)
- Nayuta Higa
- Department of Neurosurgery, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
- Department of Neurosurgery, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Toshiaki Akahane
- Department of Pathology, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
- Center for Human Genome and Gene Analysis, Kagoshima University Hospital, Kagoshima, Japan
| | - Seiya Yokoyama
- Department of Pathology, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
| | - Ryutaro Makino
- Department of Neurosurgery, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
| | - Hajime Yonezawa
- Department of Neurosurgery, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
| | - Hiroyuki Uchida
- Department of Neurosurgery, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
| | - Tomoko Takajo
- Department of Neurosurgery, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
| | - Mari Kirishima
- Department of Pathology, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
| | - Taiji Hamada
- Department of Pathology, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
| | - Naoki Noguchi
- Department of Neurosurgery, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Ryosuke Otsuji
- Department of Neurosurgery, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Daisuke Kuga
- Department of Neurosurgery, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Shohei Nagasaka
- Department of Neurosurgery, University of Occupational and Environmental Health, Kitakyushu, Japan
| | - Hitoshi Yamahata
- Department of Neurosurgery, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
| | - Junkoh Yamamoto
- Department of Neurosurgery, University of Occupational and Environmental Health, Kitakyushu, Japan
| | - Koji Yoshimoto
- Department of Neurosurgery, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Akihide Tanimoto
- Corresponding Authors: Akihide Tanimoto, MD, PhD, Department of Pathology, Graduate School of Medical and Dental Sciences, Kagoshima University, 8-35-1 Sakuragaoka, Kagoshima-City, Kagoshima 890-8544, Japan ()
| | - Ryosuke Hanaya
- Ryosuke Hanaya, MD, PhD, Department of Neurosurgery, Graduate School of Medical and Dental Sciences, Kagoshima University, 8-35-1 Sakuragaoka, Kagoshima-City, Kagoshima 890-8520, Japan ()
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11
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Yakovlev VA, Sullivan SA, Fields EC, Temkin SM. PARP inhibitors in the treatment of ARID1A mutant ovarian clear cell cancer: PI3K/Akt1-dependent mechanism of synthetic lethality. Front Oncol 2023; 13:1124147. [PMID: 36910637 PMCID: PMC9992988 DOI: 10.3389/fonc.2023.1124147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Accepted: 02/13/2023] [Indexed: 02/24/2023] Open
Abstract
Introduction Poly(ADP-ribose) polymerase (PARP) is a nuclear enzyme involved in the repair of DNA single-strand breaks (SSB). The recent development of poly(ADP-ribose) polymerase inhibitors (PARPi) results from over 45 years of studies. When the activity of PARP1 or PARP2 is compromised, DNA SSB lesions are unresolved and can be converted to DNA double-strand breaks (DSBs) by the cellular transcription mechanisms. ARID1A (also called BAF250a) is an important component of the mammalian Switch/Sucrose Non-Fermentable (SWI/SNF) chromatin-remodeling complex. ARID1A gene demonstrates >50% of mutation rate in ovarian clear-cell carcinomas (OCCC). Mutated or downregulated ARID1A significantly compromises the Homologous Recombination Repair (HRR) of DNA DSB. Results The present study demonstrated that downregulated or mutated ARID1A attenuates DNA HRR through stimulation of the PI3K/Akt1 pathway and makes tumor cells highly sensitive to PARPi and PARPi/ionizing radiation (IR) combination. We showed that PI3K/Akt1 pathway plays an important role in the sensitization of cancer cell lines with compromised function of ARID1A to PARPi treatment. Discussion We believe that using of PARPi monotherapy or in combination with radiation therapy is an appealing strategy for treating ARID1A-mutated cancers, as well as many other types of PI3K/Akt1-driven cancers.
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Affiliation(s)
- Vasily A Yakovlev
- Department of Radiation Oncology, Massey Cancer Center, Virginia Commonwealth University, Richmond, VA, United States
| | - Stephanie A Sullivan
- Gynecologic Oncology Division, Massey Cancer Center, Virginia Commonwealth University, Richmond, VA, United States
| | - Emma C Fields
- Department of Radiation Oncology, Massey Cancer Center, Virginia Commonwealth University, Richmond, VA, United States
| | - Sarah M Temkin
- Gynecologic Oncology Division, Massey Cancer Center, Virginia Commonwealth University, Richmond, VA, United States
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Liao M, Beltman J, Giordano H, Harding TC, Maloney L, Simmons AD, Xiao JJ. Clinical Pharmacokinetics and Pharmacodynamics of Rucaparib. Clin Pharmacokinet 2022; 61:1477-1493. [PMID: 36107395 PMCID: PMC9652254 DOI: 10.1007/s40262-022-01157-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/10/2022] [Indexed: 01/31/2023]
Abstract
Rucaparib is an oral small-molecule poly(ADP-ribose) polymerase inhibitor indicated for patients with recurrent ovarian cancer in the maintenance and treatment settings and for patients with metastatic castration-resistant prostate cancer associated with a deleterious BRCA1 or BRCA2 mutation. Rucaparib has a manageable safety profile; the most common adverse events reported were fatigue and nausea in both indications. Accumulation in plasma exposure occurred after repeated administration of the approved 600-mg twice-daily dosage. Steady state was achieved after continuous twice-daily dosing for a week. Rucaparib has moderate oral bioavailability and can be dosed with or without food. Although a high-fat meal weakly increased maximum concentration and area under the curve, the effect was not clinically significant. A mass balance analysis indicated almost a complete dose recovery of rucaparib over 12 days, with metabolism, renal, and hepatic excretion as the elimination routes. A population pharmacokinetic analysis of rucaparib revealed no effect of age, sex, race, or body weight. No starting dose adjustments were necessary for patients with mild-to-moderate hepatic or renal impairment; the effect of severe organ impairment on rucaparib exposure has not been evaluated. In patients, rucaparib moderately inhibited cytochrome P450 (CYP) 1A2 and weakly inhibited CYP3As, CYP2C9, and CYP2C19. Rucaparib weakly increased systemic exposures of oral contraceptives and oral rosuvastatin and marginally increased the exposure of oral digoxin (a P-glycoprotein substrate). In vitro studies suggested that rucaparib inhibits transporters MATE1, MATE2-K, OCT1, and OCT2. No clinically meaningful drug interactions with rucaparib as a perpetrator were observed. An exposure-response analysis revealed dose-dependent changes in selected clinical efficacy and safety endpoints. Overall, this article provides a comprehensive review of the clinical pharmacokinetics, pharmacodynamics, drug-drug interactions, effects of intrinsic and extrinsic factors, and exposure-response relationships of rucaparib.
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Affiliation(s)
- Mingxiang Liao
- Clovis Oncology, Inc., 500 Flatiron Pkwy, Suite 100, Boulder, CO, 80301, USA
| | - Jeri Beltman
- Clovis Oncology, Inc., 500 Flatiron Pkwy, Suite 100, Boulder, CO, 80301, USA
| | - Heidi Giordano
- Clovis Oncology, Inc., 500 Flatiron Pkwy, Suite 100, Boulder, CO, 80301, USA
| | - Thomas C Harding
- Clovis Oncology, Inc., 500 Flatiron Pkwy, Suite 100, Boulder, CO, 80301, USA
| | - Lara Maloney
- Clovis Oncology, Inc., 500 Flatiron Pkwy, Suite 100, Boulder, CO, 80301, USA
| | - Andrew D Simmons
- Clovis Oncology, Inc., 500 Flatiron Pkwy, Suite 100, Boulder, CO, 80301, USA
| | - Jim J Xiao
- Clovis Oncology, Inc., 500 Flatiron Pkwy, Suite 100, Boulder, CO, 80301, USA.
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Misra S, Chowdhury SG, Ghosh G, Mukherjee A, Karmakar P. Both phosphorylation and phosphatase activity of PTEN are required to prevent replication fork progression during stress by inducing heterochromatin. Mutat Res 2022; 825:111800. [PMID: 36155262 DOI: 10.1016/j.mrfmmm.2022.111800] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Revised: 08/26/2022] [Accepted: 09/09/2022] [Indexed: 06/16/2023]
Abstract
PTEN is a tumor suppressor protein frequently altered in various cancers. PTEN-null cells have a characteristic of rapid proliferation with an unstable genome. Replication stress is one of the causes of the accumulation of genomic instability if not sensed by the cellular signaling. Though PTEN-null cells have shown to be impaired in replication progression and stalled fork recovery, the association between the catalytic function of PTEN regulated by posttranslational modulation and cellular response to replication stress has not been studied explicitly. To understand molecular mechanism, we find that PTEN-null cells display unrestrained replication fork progression with accumulation of damaged DNA after treatment with aphidicolin which can be rescued by ectopic expression of full-length PTEN, as evident from DNA fiber assay. Moreover, the C-terminal phosphorylation (Ser 380, Thr 382/383) of PTEN is essential for its chromatin association and sensing replication stress that, in response, induce cell cycle arrest. Further, we observed that PTEN induces HP1α expression and H3K9me3 foci formation in a C-terminal phosphorylation-dependent manner. However, phosphatase dead PTEN cannot sense replication stress though it can be associated with chromatin. Together, our results suggest that DNA replication perturbation by aphidicolin enables chromatin association of PTEN through C-terminal phosphorylation, induces heterochromatin formation by stabilizing and up-regulating H3K9me3 foci and augments CHK1 activation. Thereby, PTEN prevents DNA replication fork elongation and simultaneously causes G1-S phase cell cycle arrest to limit cell proliferation in stress conditions. Thus PTEN act as stress sensing protein during replication arrest to maintain genomic stability.
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Affiliation(s)
- Sandip Misra
- PG Department of Microbiology, Bidhannagar College, EB-2 Sector-1, Saltlake, Kolkata, India
| | | | - Ginia Ghosh
- Department of Life Science and Biotechnology, Jadavpur University, Kolkata, India
| | - Ananda Mukherjee
- Rajiv Gandhi Centre for Biotechnology,Thiruvananthapuram 695 014, Kerala, India
| | - Parimal Karmakar
- Department of Life Science and Biotechnology, Jadavpur University, Kolkata, India.
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Inhibition of BAD-Ser99 phosphorylation synergizes with PARP inhibition to ablate PTEN-deficient endometrial carcinoma. Cell Death Dis 2022; 13:558. [PMID: 35725817 PMCID: PMC9209517 DOI: 10.1038/s41419-022-04982-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2021] [Revised: 05/18/2022] [Accepted: 05/26/2022] [Indexed: 01/21/2023]
Abstract
Loss of phosphatase and tensin homolog (PTEN) impairs DNA double-strand repair and confers sensitivity to poly (ADP-ribose) polymerase inhibitors (PARPis). However, PARPis also hyperactivate the MAPK and PI3K/AKT/mTOR pathways in PTEN-deficient endometrial carcinoma (EC), which allows the emergence of PARPi resistance. BCL-2-associated death promoter (BAD), integrates the common cell survival effects of the RAS/MEK/MAPK and PI3K/AKT/mTOR pathways. Herein, it was observed that increased BADSer99 (BADS99) phosphorylation in EC cells was significantly associated with PTEN-deficient status. Forced expression of phosphorylation deficient human BADS99A in PTEN-deficient EC cells significantly increased CASPASE 3/7 activity and decreased EC cell viability. Using NPB as a pharmacological inhibitor of pBADS99 phosphorylation, it was demonstrated that NPB synergized with PARPis (Olaparib, Rucaparib and Talazoparib) to enhance PARPi IC50 up to 60-fold and decreased survival, foci formation, and growth in 3D ex vivo culture of PTEN-deficient EC cells. Combined NPB-PARPi treatment of PTEN-deficient EC cells stimulated apoptosis and promoted DNA damage by impairment of homologous recombination. Using the clustered regularly interspaced short palindromic repeats (CRISPR)-Cas9 endonuclease system it was demonstrated that deletion of PTEN in PTEN replete EC cells enhanced the efficacy of combined NPB-PARPi treatment. Furthermore, combined inhibition of BADS99 phosphorylation and PARP ablated xenograft growth of PTEN-deficient EC cells. Similarly, a combination of NPB and PARPis significantly suppressed the growth of PTEN deficient patient-derived EC organoids. Hence, combined inhibition of BADS99 phosphorylation and PARP represents a rational and efficacious strategy to improve the prognosis of recurrent EC patients.
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15
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Huang W, Hao Z, Mao F, Guo D. Small Molecule Inhibitors in Adult High-Grade Glioma: From the Past to the Future. Front Oncol 2022; 12:911876. [PMID: 35785151 PMCID: PMC9247310 DOI: 10.3389/fonc.2022.911876] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2022] [Accepted: 05/13/2022] [Indexed: 12/12/2022] Open
Abstract
Glioblastoma is the most common primary malignant tumor in the brain and has a dismal prognosis despite patients accepting standard therapies. Alternation of genes and deregulation of proteins, such as receptor tyrosine kinase, PI3K/Akt, PKC, Ras/Raf/MEK, histone deacetylases, poly (ADP-ribose) polymerase (PARP), CDK4/6, branched-chain amino acid transaminase 1 (BCAT1), and Isocitrate dehydrogenase (IDH), play pivotal roles in the pathogenesis and progression of glioma. Simultaneously, the abnormalities change the cellular biological behavior and microenvironment of tumor cells. The differences between tumor cells and normal tissue become the vulnerability of tumor, which can be taken advantage of using targeted therapies. Small molecule inhibitors, as an important part of modern treatment for cancers, have shown significant efficacy in hematologic cancers and some solid tumors. To date, in glioblastoma, there have been more than 200 clinical trials completed or ongoing in which trial designers used small molecules as monotherapy or combination regimens to correct the abnormalities. In this review, we summarize the dysfunctional molecular mechanisms and highlight the outcomes of relevant clinical trials associated with small-molecule targeted therapies. Based on the outcomes, the main findings were that small-molecule inhibitors did not bring more benefit to newly diagnosed glioblastoma, but the clinical studies involving progressive glioblastoma usually claimed “noninferiority” compared with historical results. However, as to the clinical inferiority trial, similar dosing regimens should be avoided in future clinical trials.
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Affiliation(s)
- Wenda Huang
- Department of Neurosurgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Zhaonian Hao
- Department of Neurosurgery, Beijing TianTan Hospital, Capital Medical University, Beijing, China
| | - Feng Mao
- Department of Neurosurgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- *Correspondence: Dongsheng Guo, ; Feng Mao,
| | - Dongsheng Guo
- Department of Neurosurgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- *Correspondence: Dongsheng Guo, ; Feng Mao,
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Maksoud S. The DNA Double-Strand Break Repair in Glioma: Molecular Players and Therapeutic Strategies. Mol Neurobiol 2022; 59:5326-5365. [PMID: 35696013 DOI: 10.1007/s12035-022-02915-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Accepted: 06/05/2022] [Indexed: 12/12/2022]
Abstract
Gliomas are the most frequent type of tumor in the central nervous system, which exhibit properties that make their treatment difficult, such as cellular infiltration, heterogeneity, and the presence of stem-like cells responsible for tumor recurrence. The response of this type of tumor to chemoradiotherapy is poor, possibly due to a higher repair activity of the genetic material, among other causes. The DNA double-strand breaks are an important type of lesion to the genetic material, which have the potential to trigger processes of cell death or cause gene aberrations that could promote tumorigenesis. This review describes how the different cellular elements regulate the formation of DNA double-strand breaks and their repair in gliomas, discussing the therapeutic potential of the induction of this type of lesion and the suppression of its repair as a control mechanism of brain tumorigenesis.
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Affiliation(s)
- Semer Maksoud
- Experimental Therapeutics and Molecular Imaging Unit, Department of Neurology, Neuro-Oncology Division, Massachusetts General Hospital, Harvard Medical School, Boston, MA, 02114, USA.
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Insights into the Possible Molecular Mechanisms of Resistance to PARP Inhibitors. Cancers (Basel) 2022; 14:cancers14112804. [PMID: 35681784 PMCID: PMC9179506 DOI: 10.3390/cancers14112804] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Revised: 06/02/2022] [Accepted: 06/03/2022] [Indexed: 12/12/2022] Open
Abstract
Simple Summary The increasingly wide use of PARP inhibitors in breast, ovarian, pancreatic, and prostate cancers harbouring a pathogenic variant in BRCA1 or BRCA2 has highlighted the problem of resistance to therapy. This review summarises the complex interactions between PARP1, cell cycle regulation, response to stress replication, homologous recombination, and other DNA damage repair pathways in the setting of BRCA1/2 mutated cancers that could explain the development of primary or secondary resistance to PARP inhibitors. Abstract PARP1 enzyme plays an important role in DNA damage recognition and signalling. PARP inhibitors are approved in breast, ovarian, pancreatic, and prostate cancers harbouring a pathogenic variant in BRCA1 or BRCA2, where PARP1 inhibition results mainly in synthetic lethality in cells with impaired homologous recombination. However, the increasingly wide use of PARP inhibitors in clinical practice has highlighted the problem of resistance to therapy. Several different mechanisms of resistance have been proposed, although only the acquisition of secondary mutations in BRCA1/2 has been clinically proved. The aim of this review is to outline the key molecular findings that could explain the development of primary or secondary resistance to PARP inhibitors, analysing the complex interactions between PARP1, cell cycle regulation, PI3K/AKT signalling, response to stress replication, homologous recombination, and other DNA damage repair pathways in the setting of BRCA1/2 mutated cancers.
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Immune Landscape in PTEN-Related Glioma Microenvironment: A Bioinformatic Analysis. Brain Sci 2022; 12:brainsci12040501. [PMID: 35448032 PMCID: PMC9029006 DOI: 10.3390/brainsci12040501] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Revised: 03/30/2022] [Accepted: 04/12/2022] [Indexed: 02/04/2023] Open
Abstract
Introduction: PTEN gene mutations are frequently found in the genetic landscape of high-grade gliomas since they influence cell proliferation, proangiogenetic pathways, and antitumoral immune response. The present bioinformatics analysis explores the PTEN gene expression profile in HGGs as a prognostic factor for survival, especially focusing on the related immune microenvironment. The effects of PTEN mutation on the susceptibility to conventional chemotherapy were also investigated. Methods: Clinical and genetic data of GBMs and normal tissue samples were acquired from The Cancer Genome Atlas (TCGA)-GBM and Genotype-Tissue Expression (GTEx) online databases, respectively. The genetic differential expressions were analyzed in both groups via the one-way ANOVA test. Kaplan−Meier survival curves were applied to estimate the overall survival (OS) and disease-free survival (DFS). The Genomics of Drug Sensitivity in Cancer platform was chosen to assess the response of PTEN-mutated GBMs to temozolomide (TMZ). p < 0.05 was fixed as statistically significant. On Tumor Immune Estimation Resource and Gene Expression Profiling Interactive Analysis databases, the linkage between immune cell recruitment and PTEN status was assessed through Spearman’s correlation analysis. Results: PTEN was found mutated in 22.2% of the 617 TCGA-GBMs patients, with a higher log2-transcriptome per million reads compared to the GTEx group (255 samples). Survival curves revealed a worse OS and DFS, albeit not significant, for the high-PTEN profile GBMs. Spearman’s analysis of immune cells demonstrated a strong positive correlation between the PTEN status and infiltration of Treg (ρ = 0.179) and M2 macrophages (ρ = 0.303). The half-maximal inhibitor concentration of TMZ was proven to be lower for PTEN-mutated GBMs compared with PTEN wild-types. Conclusions: PTEN gene mutations prevail in GBMs and are strongly related to poor prognosis and least survival. The infiltrating immune lymphocytes Treg and M2 macrophages populate the glioma microenvironment and control the mechanisms of tumor progression, immune escape, and sensitivity to standard chemotherapy. Broader studies are required to confirm these findings and turn them into new therapeutic perspectives.
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Rasool R, Ullah I, Mubeen B, Alshehri S, Imam SS, Ghoneim MM, Alzarea SI, Al-Abbasi FA, Murtaza BN, Kazmi I, Nadeem MS. Theranostic Interpolation of Genomic Instability in Breast Cancer. Int J Mol Sci 2022; 23:ijms23031861. [PMID: 35163783 PMCID: PMC8836911 DOI: 10.3390/ijms23031861] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2021] [Revised: 01/26/2022] [Accepted: 01/27/2022] [Indexed: 12/14/2022] Open
Abstract
Breast cancer is a diverse disease caused by mutations in multiple genes accompanying epigenetic aberrations of hazardous genes and protein pathways, which distress tumor-suppressor genes and the expression of oncogenes. Alteration in any of the several physiological mechanisms such as cell cycle checkpoints, DNA repair machinery, mitotic checkpoints, and telomere maintenance results in genomic instability. Theranostic has the potential to foretell and estimate therapy response, contributing a valuable opportunity to modify the ongoing treatments and has developed new treatment strategies in a personalized manner. “Omics” technologies play a key role while studying genomic instability in breast cancer, and broadly include various aspects of proteomics, genomics, metabolomics, and tumor grading. Certain computational techniques have been designed to facilitate the early diagnosis of cancer and predict disease-specific therapies, which can produce many effective results. Several diverse tools are used to investigate genomic instability and underlying mechanisms. The current review aimed to explore the genomic landscape, tumor heterogeneity, and possible mechanisms of genomic instability involved in initiating breast cancer. We also discuss the implications of computational biology regarding mutational and pathway analyses, identification of prognostic markers, and the development of strategies for precision medicine. We also review different technologies required for the investigation of genomic instability in breast cancer cells, including recent therapeutic and preventive advances in breast cancer.
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Affiliation(s)
- Rabia Rasool
- Institute of Molecular Biology and Biotechnology, The University of Lahore, Lahore 54000, Pakistan; (R.R.); (I.U.); (B.M.)
| | - Inam Ullah
- Institute of Molecular Biology and Biotechnology, The University of Lahore, Lahore 54000, Pakistan; (R.R.); (I.U.); (B.M.)
| | - Bismillah Mubeen
- Institute of Molecular Biology and Biotechnology, The University of Lahore, Lahore 54000, Pakistan; (R.R.); (I.U.); (B.M.)
| | - Sultan Alshehri
- Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia; (S.A.); (S.S.I.)
| | - Syed Sarim Imam
- Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia; (S.A.); (S.S.I.)
| | - Mohammed M. Ghoneim
- Department of Pharmacy Practice, College of Pharmacy, AlMaarefa University, Ad Diriyah 13713, Saudi Arabia;
| | - Sami I. Alzarea
- Department of Pharmacology, College of Pharmacy, Jouf University, Sakaka 72341, Saudi Arabia;
| | - Fahad A. Al-Abbasi
- Department of Biochemistry, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia;
| | - Bibi Nazia Murtaza
- Department of Zoology, Abbottabad University of Science and Technology (AUST), Abbottabad 22310, Pakistan;
| | - Imran Kazmi
- Department of Biochemistry, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia;
- Correspondence: (I.K.); (M.S.N.)
| | - Muhammad Shahid Nadeem
- Department of Biochemistry, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia;
- Correspondence: (I.K.); (M.S.N.)
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Zhang M, Ma SC, Tan JL, Wang J, Bai X, Dong ZY, Zhang QX. Inferring Homologous Recombination Deficiency of Ovarian Cancer From the Landscape of Copy Number Variation at Subchromosomal and Genetic Resolutions. Front Oncol 2021; 11:772604. [PMID: 34976815 PMCID: PMC8716765 DOI: 10.3389/fonc.2021.772604] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Accepted: 11/19/2021] [Indexed: 11/13/2022] Open
Abstract
BackgroundHomologous recombination deficiency (HRD) is characterized by overall genomic instability and has emerged as an indispensable therapeutic target across various tumor types, particularly in ovarian cancer (OV). Unfortunately, current detection assays are far from perfect for identifying every HRD patient. The purpose of this study was to infer HRD from the landscape of copy number variation (CNV).MethodsGenome-wide CNV landscape was measured in OV patients from the Australian Ovarian Cancer Study (AOCS) clinical cohort and >10,000 patients across 33 tumor types from The Cancer Genome Atlas (TCGA). HRD-predictive CNVs at subchromosomal resolution were identified through exploratory analysis depicting the CNV landscape of HRD versus non-HRD OV patients and independently validated using TCGA and AOCS cohorts. Gene-level CNVs were further analyzed to explore their potential predictive significance for HRD across tumor types at genetic resolution.ResultsAt subchromosomal resolution, 8q24.2 amplification and 5q13.2 deletion were predominantly witnessed in HRD patients (both p < 0.0001), whereas 19q12 amplification occurred mainly in non-HRD patients (p < 0.0001), compared with their corresponding counterparts within TCGA-OV. The predictive significance of 8q24.2 amplification (p < 0.0001), 5q13.2 deletion (p = 0.0056), and 19q12 amplification (p = 0.0034) was externally validated within AOCS. Remarkably, pan-cancer analysis confirmed a cross-tumor predictive role of 8q24.2 amplification for HRD (p < 0.0001). Further analysis of CNV in 8q24.2 at genetic resolution revealed that amplifications of the oncogenes, MYC (p = 0.0001) and NDRG1 (p = 0.0004), located on this fragment were also associated with HRD in a pan-cancer manner.ConclusionsThe CNV landscape serves as a generalized predictor of HRD in cancer patients not limited to OV. The detection of CNV at subchromosomal or genetic resolution could aid in the personalized treatment of HRD patients.
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Affiliation(s)
- Meng Zhang
- Department of Obstetrics and Gynecology, Reproductive Medicine Centre, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China
- Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Medical Research Center, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China
| | - Si-Cong Ma
- Department of Radiation Oncology, Nanfang Hospital, Southern Medical University, Guangzhou, China
- Information Management and Big Data Center, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Jia-Le Tan
- Department of Radiation Oncology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Jian Wang
- Department of Radiation Oncology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Xue Bai
- Department of Radiation Oncology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Zhong-Yi Dong
- Department of Radiation Oncology, Nanfang Hospital, Southern Medical University, Guangzhou, China
- *Correspondence: Qing-Xue Zhang, ; Zhong-Yi Dong,
| | - Qing-Xue Zhang
- Department of Obstetrics and Gynecology, Reproductive Medicine Centre, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China
- *Correspondence: Qing-Xue Zhang, ; Zhong-Yi Dong,
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21
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Hamila SA, Ooms LM, Rodgers SJ, Mitchell CA. The INPP4B paradox: Like PTEN, but different. Adv Biol Regul 2021; 82:100817. [PMID: 34216856 DOI: 10.1016/j.jbior.2021.100817] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Revised: 05/28/2021] [Accepted: 06/10/2021] [Indexed: 06/13/2023]
Abstract
Cancer is a complex and heterogeneous disease marked by the dysregulation of cancer driver genes historically classified as oncogenes or tumour suppressors according to their ability to promote or inhibit tumour development and growth, respectively. Certain genes display both oncogenic and tumour suppressor functions depending on the biological context, and as such have been termed dual-role cancer driver genes. However, because of their context-dependent behaviour, the tumourigenic mechanism of many dual-role genes is elusive and remains a significant knowledge gap in our effort to understand and treat cancer. Inositol polyphosphate 4-phosphatase type II (INPP4B) is an emerging dual-role cancer driver gene, primarily known for its role as a negative regulator of the phosphoinositide 3-kinase (PI3K)/AKT signalling pathway. In response to growth factor stimulation, class I PI3K generates PtdIns(3,4,5)P3 at the plasma membrane. PtdIns(3,4,5)P3 can be hydrolysed by inositol polyphosphate 5-phosphatases to generate PtdIns(3,4)P2, which, together with PtdIns(3,4,5)P3, facilitates the activation of AKT to promote cell proliferation, survival, migration, and metabolism. Phosphatase and tensin homology on chromosome 10 (PTEN) and INPP4B are dual-specificity phosphatases that hydrolyse PtdIns(3,4,5)P3 and PtdIns(3,4)P2, respectively, and thus negatively regulate PI3K/AKT signalling. PTEN is a bona fide tumour suppressor that is frequently lost in human tumours. INPP4B was initially characterised as a tumour suppressor akin to PTEN, and has been implicated as such in a number of cancers, including prostate, thyroid, and basal-like breast cancers. However, evidence has since emerged revealing INPP4B as a paradoxical oncogene in several malignancies, with increased INPP4B expression reported in AML, melanoma and colon cancers among others. Although the tumour suppressive function of INPP4B has been mostly ascribed to its ability to negatively regulate PI3K/AKT signalling, its oncogenic function remains less clear, with proposed mechanisms including promotion of PtdIns(3)P-dependent SGK3 signalling, inhibition of PTEN-dependent AKT activation, and enhancing DNA repair mechanisms to confer chemoresistance. Nevertheless, research is ongoing to identify the factors that dictate the tumourigenic output of INPP4B in different human cancers. In this review we discuss the dualistic role that INPP4B plays in the context of cancer development, progression and treatment, drawing comparisons to PTEN to explore how their similarities and, importantly, their differences may account for their diverging roles in tumourigenesis.
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Affiliation(s)
- Sabryn A Hamila
- Cancer Program, Monash Biomedicine Discovery Institute and Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC, 3800, Australia
| | - Lisa M Ooms
- Cancer Program, Monash Biomedicine Discovery Institute and Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC, 3800, Australia
| | - Samuel J Rodgers
- Cancer Program, Monash Biomedicine Discovery Institute and Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC, 3800, Australia
| | - Christina A Mitchell
- Cancer Program, Monash Biomedicine Discovery Institute and Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC, 3800, Australia.
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22
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Misra S, Ghosh G, Chowdhury SG, Karmakar P. Non-canonical function of nuclear PTEN and its implication on tumorigenesis. DNA Repair (Amst) 2021; 107:103197. [PMID: 34359000 DOI: 10.1016/j.dnarep.2021.103197] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Revised: 06/13/2021] [Accepted: 07/26/2021] [Indexed: 01/13/2023]
Abstract
Suppression of genomic instability is the key to prevent tumor development. PTEN is a unique tumor suppressor protein having both lipid and protein phosphatase activities. Interestingly though it is a cytoplasmic protein, but a significant pool of PTEN can also be localized in nucleus. The function of cytoplasmic PTEN is well defined and extensively studied in various literatures focusing mainly on the negative regulation of oncogenic PI-3Kinase-AKT pathway but functional regulation of nuclear PTEN is less defined and therefore it is a fascinating subject of research in cancer biology. Post-translation modulation of PTEN such as phosphorylation, sumorylation, acetylation and methylation also regulates its cellular localization, protein-protein association and catalytic function. Loss or mutation in PTEN is associated with the development of tumors in various tissues from the brain to prostate. Here we have summarized the role of nuclear PTEN and its epigenetic modulation in various DNA metabolic pathways, for example, DNA damage response, DNA repair, DNA replication, DNA segregation etc. Further, pathways involved in nuclear PTEN degradation are also discussed. Additionally, we also emphasize probable potential targets associated with PTEN pathway for chemotherapeutic purpose.
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Affiliation(s)
- Sandip Misra
- PG Department of Microbiology, Bidhannagar College, EB-2 Sector-1, Saltlake, Kolkata, India
| | - Ginia Ghosh
- Department of Life Science and Biotechnology, Jadavpur University, Kolkata, India
| | | | - Parimal Karmakar
- Department of Life Science and Biotechnology, Jadavpur University, Kolkata, India.
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23
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Khasraw M, Fujita Y, Lee-Chang C, Balyasnikova IV, Najem H, Heimberger AB. New Approaches to Glioblastoma. Annu Rev Med 2021; 73:279-292. [PMID: 34665646 DOI: 10.1146/annurev-med-042420-102102] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Faced with unique immunobiology and marked heterogeneity, treatment strategies for glioblastoma require therapeutic approaches that diverge from conventional oncological strategies. The selection and prioritization of targeted and immunotherapeutic strategies will need to carefully consider these features and companion biomarkers developed alongside treatment strategies to identify the appropriate patient populations. Novel clinical trial strategies that interrogate the tumor microenvironment for drug penetration and target engagement will inform go/no-go later-stage clinical studies. Innovative trial designs and analyses are needed to move effective agents toward regulatory approvals more rapidly. Expected final online publication date for the Annual Review of Medicine, Volume 73 is January 2022. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.
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Affiliation(s)
- Mustafa Khasraw
- Duke University School of Medicine, Durham, North Carolina 27710, USA
| | - Yoko Fujita
- Department of Neurosurgery, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030, USA
| | - Cataline Lee-Chang
- Department of Neurosurgery, Northwestern University, Chicago, Illinois 60611, USA;
| | - Irina V Balyasnikova
- Department of Neurosurgery, Northwestern University, Chicago, Illinois 60611, USA;
| | - Hinda Najem
- Department of Neurosurgery, Northwestern University, Chicago, Illinois 60611, USA;
| | - Amy B Heimberger
- Department of Neurosurgery, Northwestern University, Chicago, Illinois 60611, USA;
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24
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Shan Y, Wang F, Wei Z, Lu Y. Synthetic lethality theory approaches to effective substance discovery and functional mechanisms elucidation of anti-cancer phytomedicine. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2021; 91:153718. [PMID: 34531099 DOI: 10.1016/j.phymed.2021.153718] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Revised: 08/04/2021] [Accepted: 08/15/2021] [Indexed: 06/13/2023]
Abstract
BACKGROUND Longstanding, successful use of combinations of phytopharmaceuticals in traditional Chinese medicine (TCM) has caught the attention of several pharmacologists to natural medicines. However, the development and popularisation of TCM is mainly limited because of the unavailability of reports clarifying the mechanisms of action and pharmacologically active ingredients in such formulations. Previous studies on natural medicines have mostly focused on their dominant components using forward pharmacology which often neglects trace components. It is necessary to assess the pharmacological and therapeutic superiority of many such trace components in comparison with single constituents. PURPOSE In this study, we aimed to propose a new pharmacological research strategy for TCM. In particular, we presented the possibility that the effective mechanism of action of trace components of TCM is based on synthetic lethality. We sincerely hope to explore this theory further. METHOD We obtained retrieve published research information related to synthetic lethality, phytochemicals and Chinese medicine from PubMed and Google scholar. Based on the inclusion criteria, 71 studies were selected and discussed in this review. RESULTS As an interaction among genes, synthetic lethality can amplify co-regulatory biological effects exponentially. Synthetic strategies have been successfully applied for research and development of anti-tumour agents, including poly ADP-ribose polymerase inhibitors and clinical combination of chemotherapeutic agents for efficacy enhancement and toxicity reduction. TCM drugs contain several secondary metabolites to combat environmental stresses, providing a multi-component basis for corresponding synergistic targets. Therefore, we aimed to study whether this method could be used to identify active components present in trace amounts in TCM drugs. Based on a reverse concept of target-component-effect and identified synergistic targets, we explored the mechanisms of action of weakly active components present in trace amounts in TCM drugs to assess combinations of potential synergistic components. CONCLUSION This pattern of synthetic lethality not only elucidated the mechanisms of action of TCM drugs from a new perspective but also inspired future studies on discovering naturally occurring active components.
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Affiliation(s)
- Yunlong Shan
- Key Laboratory of Drug Metabolism and Pharmacokinetics, State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing 210009, China
| | - Fang Wang
- College of Food Science and Engineering/Collaborative Innovation Center for Modern Grain Circulation and Safety/Key Laboratory of Grains and Oils Quality Control and Processing, Nanjing University of Finance and Economics, Nanjing 210023, China
| | - Zhonghong Wei
- School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, Jiangsu Province, China.
| | - Yin Lu
- School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, Jiangsu Province, China.
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25
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Das S, Al-Toubah T, Strosberg J. Chemotherapy in Neuroendocrine Tumors. Cancers (Basel) 2021; 13:4872. [PMID: 34638356 PMCID: PMC8507720 DOI: 10.3390/cancers13194872] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 09/23/2021] [Accepted: 09/24/2021] [Indexed: 12/16/2022] Open
Abstract
The role for cytotoxic chemotherapy in patients with well-differentiated neuroendocrine tumors (NETs) remains debated. Compared to patients with poorly differentiated neuroendocrine carcinomas (NECs) where chemotherapy is utilized ubiquitously, chemotherapy may play a more select role in patients with certain types of NETs (e.g., pancreatic tumors, higher grade tumors, and tumors possessing DNA damage repair defects). The primary types of chemotherapy that have been tested in patients with NETs include alkylating agent- and platinum agent-based combinations. Across regimens, chemotherapy appears to elicit greater antitumor activity in patients with pancreatic or grade 3 NETs. The role for chemotherapy in lower grade extra-pancreatic NETs remains undefined. Furthermore, while chemotherapy has demonstrated clinically meaningful benefit for patients in the systemic setting, its role in the adjuvant or neoadjuvant setting is as-of-yet undetermined. Finally, efforts to combine chemotherapy with targeted therapy and peptide receptor radionuclide therapy are ongoing, in hopes of improving the cytoreductive treatment options for patients with NETs.
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Affiliation(s)
- Satya Das
- Department of Medicine, Division of Hematology and Oncology, Vanderbilt University Medical Center, Nashville, TN 37209, USA;
| | - Taymeyah Al-Toubah
- Moffitt Cancer Center, Department of Gastrointestinal Oncology, Tampa, FL 33612, USA;
| | - Jonathan Strosberg
- Moffitt Cancer Center, Department of Gastrointestinal Oncology, Tampa, FL 33612, USA;
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26
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Rattray Z, Deng G, Zhang S, Shirali A, May CK, Chen X, Cuffari BJ, Liu J, Zou P, Rattray NJ, Johnson CH, Dubljevic V, Campbell JA, Huttner A, Baehring JM, Zhou J, Hansen JE. ENT2 facilitates brain endothelial cell penetration and blood-brain barrier transport by a tumor-targeting anti-DNA autoantibody. JCI Insight 2021; 6:e145875. [PMID: 34128837 PMCID: PMC8410084 DOI: 10.1172/jci.insight.145875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Accepted: 06/10/2021] [Indexed: 11/18/2022] Open
Abstract
The blood-brain barrier (BBB) prevents antibodies from penetrating the CNS and limits conventional antibody-based approaches to brain tumors. We now show that ENT2, a transporter that regulates nucleoside flux at the BBB, may offer an unexpected path to circumventing this barrier to allow targeting of brain tumors with an anti-DNA autoantibody. Deoxymab-1 (DX1) is a DNA-damaging autoantibody that localizes to tumors and is synthetically lethal to cancer cells with defects in the DNA damage response. We found that DX1 penetrated brain endothelial cells and crossed the BBB, and mechanistic studies identify ENT2 as the key transporter. In efficacy studies, DX1 crosses the BBB to suppress orthotopic glioblastoma and breast cancer brain metastases. ENT2-linked transport of autoantibodies across the BBB has potential to be exploited in brain tumor immunotherapy, and its discovery raises hypotheses on actionable mechanisms of CNS penetration by neurotoxic autoantibodies in CNS lupus.
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Affiliation(s)
| | - Gang Deng
- Department of Neurosurgery, Yale School of Medicine, New Haven, Connecticut, USA
| | - Shenqi Zhang
- Department of Neurosurgery, Yale School of Medicine, New Haven, Connecticut, USA
| | | | | | | | | | - Jun Liu
- Department of Neurosurgery, Yale School of Medicine, New Haven, Connecticut, USA
| | - Pan Zou
- Department of Neurosurgery, Yale School of Medicine, New Haven, Connecticut, USA
| | | | - Caroline H Johnson
- Yale School of Public Health, New Haven, Connecticut, USA.,Yale Cancer Center, New Haven, Connecticut, USA
| | | | | | - Anita Huttner
- Yale Cancer Center, New Haven, Connecticut, USA.,Department of Pathology and
| | - Joachim M Baehring
- Department of Neurosurgery, Yale School of Medicine, New Haven, Connecticut, USA.,Yale Cancer Center, New Haven, Connecticut, USA.,Department of Neurology, Yale School of Medicine, New Haven, Connecticut, USA
| | - Jiangbing Zhou
- Department of Neurosurgery, Yale School of Medicine, New Haven, Connecticut, USA.,Yale Cancer Center, New Haven, Connecticut, USA
| | - James E Hansen
- Department of Therapeutic Radiology and.,Yale Cancer Center, New Haven, Connecticut, USA
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27
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Kajitani GS, Nascimento LLDS, Neves MRDC, Leandro GDS, Garcia CCM, Menck CFM. Transcription blockage by DNA damage in nucleotide excision repair-related neurological dysfunctions. Semin Cell Dev Biol 2021; 114:20-35. [DOI: 10.1016/j.semcdb.2020.10.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Revised: 08/18/2020] [Accepted: 10/07/2020] [Indexed: 12/20/2022]
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28
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Matos-Rodrigues G, Guirouilh-Barbat J, Martini E, Lopez BS. Homologous recombination, cancer and the 'RAD51 paradox'. NAR Cancer 2021; 3:zcab016. [PMID: 34316706 PMCID: PMC8209977 DOI: 10.1093/narcan/zcab016] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Revised: 04/08/2021] [Accepted: 04/20/2021] [Indexed: 01/22/2023] Open
Abstract
Genetic instability is a hallmark of cancer cells. Homologous recombination (HR) plays key roles in genome stability and variability due to its roles in DNA double-strand break and interstrand crosslink repair, and in the protection and resumption of arrested replication forks. HR deficiency leads to genetic instability, and, as expected, many HR genes are downregulated in cancer cells. The link between HR deficiency and cancer predisposition is exemplified by familial breast and ovarian cancers and by some subgroups of Fanconi anaemia syndromes. Surprisingly, although RAD51 plays a pivotal role in HR, i.e., homology search and in strand exchange with a homologous DNA partner, almost no inactivating mutations of RAD51 have been associated with cancer predisposition; on the contrary, overexpression of RAD51 is associated with a poor prognosis in different types of tumours. Taken together, these data highlight the fact that RAD51 differs from its HR partners with regard to cancer susceptibility and expose what we call the ‘RAD51 paradox’. Here, we catalogue the dysregulations of HR genes in human pathologies, including cancer and Fanconi anaemia or congenital mirror movement syndromes, and we discuss the RAD51 paradox.
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Affiliation(s)
- Gabriel Matos-Rodrigues
- Université de Paris, INSERM U1016, UMR 8104 CNRS, Institut Cochin, Equipe Labellisée Ligue Contre le Cancer, F-75014, France
| | - Josée Guirouilh-Barbat
- Université de Paris, INSERM U1016, UMR 8104 CNRS, Institut Cochin, Equipe Labellisée Ligue Contre le Cancer, F-75014, France
| | - Emmanuelle Martini
- Université de Paris and Université Paris-Saclay, Laboratory of Development of the Gonads, IRCM/IBFJ CEA, UMR Genetic Stability, Stem Cells and Radiation, F-92265 Fontenay aux Roses, France
| | - Bernard S Lopez
- Université de Paris, INSERM U1016, UMR 8104 CNRS, Institut Cochin, Equipe Labellisée Ligue Contre le Cancer, F-75014, France
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29
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Sim HW, McDonald KL, Lwin Z, Barnes EH, Rosenthal M, Foote MC, Koh ES, Back M, Wheeler H, Sulman EP, Buckland ME, Fisher L, Leonard R, Hall M, Ashley DM, Yip S, Simes J, Khasraw M. A randomized phase II trial of veliparib, radiotherapy and temozolomide in patients with unmethylated MGMT glioblastoma: the VERTU study. Neuro Oncol 2021; 23:1736-1749. [PMID: 33984151 PMCID: PMC8485443 DOI: 10.1093/neuonc/noab111] [Citation(s) in RCA: 45] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Background Temozolomide offers minimal benefit in patients with glioblastoma with unmethylated O6-methylguanine-DNA methyltransferase (MGMT) promoter status, hence, the need for novel therapies. This study evaluated whether veliparib, a brain-penetrant poly(ADP-ribose) polymerase (PARP) inhibitor, acts synergistically with radiation and temozolomide. Methods VERTU was a multicenter 2:1 randomized phase II trial in patients with newly diagnosed glioblastoma and MGMT-unmethylated promotor status. The experimental arm consisted of veliparib and radiotherapy, followed by adjuvant veliparib and temozolomide. The standard arm consisted of concurrent temozolomide and radiotherapy, followed by adjuvant temozolomide. The primary objective was to extend the progression-free survival rate at six months (PFS-6m) in the experimental arm. Results A total of 125 participants were enrolled, with 84 in the experimental arm and 41 in the standard arm. The median age was 61 years, 70% were male, 59% had Eastern Cooperative Oncology Group (ECOG) performance status of 0, and 87% underwent macroscopic resection. PFS-6m was 46% (95% confidence interval [CI]: 36%-57%) in the experimental arm and 31% (95% CI: 18%-46%) in the standard arm. Median overall survival was 12.7 months (95% CI: 11.4-14.5 months) in the experimental arm and 12.8 months (95% CI: 9.5-15.8 months) in the standard arm. The most common grade 3-4 adverse events were thrombocytopenia and neutropenia, with no new safety signals. Conclusion The veliparib-containing regimen was feasible and well tolerated. However, there was insufficient evidence of clinical benefit in this population. Further information from correlative translational work and other trials of PARP inhibitors in glioblastoma are still awaited.
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Affiliation(s)
- Hao-Wen Sim
- NHMRC Clinical Trials Centre, University of Sydney, Sydney, Australia.,St Vincent's Clinical School, University of New South Wales, Sydney, Australia.,Department of Medical Oncology, The Kinghorn Cancer Centre, Sydney, Australia.,Department of Medical Oncology, Chris O'Brien Lifehouse, Sydney, Australia
| | - Kerrie L McDonald
- Cure Brain Cancer Neuro-Oncology Lab, University of New South Wales, Sydney, Australia
| | - Zarnie Lwin
- School of Medicine, University of Queensland, Brisbane, Australia.,Department of Medical Oncology, Royal Brisbane and Women's Hospital, Brisbane, Australia
| | | | - Mark Rosenthal
- Department of Medical Oncology, Peter MacCallum Cancer Centre, Melbourne, Australia.,Department of Medical Oncology, Royal Melbourne Hospital, Melbourne, Australia
| | - Matthew C Foote
- School of Medicine, University of Queensland, Brisbane, Australia.,Department of Radiation Oncology, Princess Alexandra Hospital, Brisbane, Australia
| | - Eng-Siew Koh
- South Western Sydney Clinical School, University of New South Wales, Sydney, Australia.,Ingham Institute for Applied Medical Research, Sydney, Australia.,Department of Radiation Oncology, Liverpool Hospital, Sydney, Australia
| | - Michael Back
- Department of Radiation Oncology, Royal North Shore Hospital, Sydney, Australia
| | - Helen Wheeler
- Department of Medical Oncology, Royal North Shore Hospital, Sydney, Australia
| | - Erik P Sulman
- Department of Radiation Oncology, NYU Grossman School of Medicine and Brain and Spine Tumors, New York, USA.,Laura and Isaac Perlmutter Cancer Center, NYU Langone Health, New York, USA
| | - Michael E Buckland
- Neuropathology Department, Royal Prince Alfred Hospital, Sydney, Australia.,Brain and Mind Centre, University of Sydney, Sydney, Australia
| | - Lauren Fisher
- NHMRC Clinical Trials Centre, University of Sydney, Sydney, Australia
| | - Robyn Leonard
- NHMRC Clinical Trials Centre, University of Sydney, Sydney, Australia
| | - Merryn Hall
- NHMRC Clinical Trials Centre, University of Sydney, Sydney, Australia
| | - David M Ashley
- Duke University School of Medicine, Duke University, Durham, NC, USA
| | - Sonia Yip
- NHMRC Clinical Trials Centre, University of Sydney, Sydney, Australia
| | - John Simes
- NHMRC Clinical Trials Centre, University of Sydney, Sydney, Australia.,Department of Medical Oncology, Chris O'Brien Lifehouse, Sydney, Australia
| | - Mustafa Khasraw
- NHMRC Clinical Trials Centre, University of Sydney, Sydney, Australia.,Duke University School of Medicine, Duke University, Durham, NC, USA
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30
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Saadeh FS, Morsi RZ, El-Kurdi A, Nemer G, Mahfouz R, Charafeddine M, Khoury J, Najjar MW, Khoueiry P, Assi HI. Correlation of genetic alterations by whole-exome sequencing with clinical outcomes of glioblastoma patients from the Lebanese population. PLoS One 2020; 15:e0242793. [PMID: 33237934 PMCID: PMC7688136 DOI: 10.1371/journal.pone.0242793] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Accepted: 11/09/2020] [Indexed: 11/24/2022] Open
Abstract
Introduction Glioblastoma (GBM) is an aggressive brain tumor associated with high degree of resistance to treatment. Given its heterogeneity, it is important to understand the molecular landscape of this tumor for the development of more effective therapies. Because of the different genetic profiles of patients with GBM, we sought to identify genetic variants in Lebanese patients with GBM (LEB-GBM) and compare our findings to those in the Cancer Genome Atlas (TCGA). Methods We performed whole exome sequencing (WES) to identify somatic variants in a cohort of 60 patient-derived GBM samples. We focused our analysis on 50 commonly mutated GBM candidate genes and compared mutation signatures between our population and publicly available GBM data from TCGA. We also cross-tabulated biological covariates to assess for associations with overall survival, time to recurrence and follow-up duration. Results We included 60 patient-derived GBM samples from 37 males and 23 females, with age ranging from 3 to 80 years (mean and median age at diagnosis were 51 and 56, respectively). Recurrent tumor formation was present in 94.8% of patients (n = 55/58). After filtering, we identified 360 somatic variants from 60 GBM patient samples. After filtering, we identified 360 somatic variants from 60 GBM patient samples. Most frequently mutated genes in our samples included ATRX, PCDHX11, PTEN, TP53, NF1, EGFR, PIK3CA, and SCN9A. Mutations in NLRP5 were associated with decreased overall survival among the Lebanese GBM cohort (p = 0.002). Mutations in NLRP5 were associated with decreased overall survival among the Lebanese GBM cohort (p = 0.002). EGFR and NF1 mutations were associated with the frontal lobe and temporal lobe in our LEB-GBM cohort, respectively. Conclusions Our WES analysis confirmed the similarity in mutation signature of the LEB-GBM population with TCGA cohorts. It showed that 1 out of the 50 commonly GBM candidate gene mutations is associated with decreased overall survival among the Lebanese cohort. This study also highlights the need for studies with larger sample sizes to inform clinicians for better prognostication and management of Lebanese patients with GBM.
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Affiliation(s)
- Fadi S. Saadeh
- Department of Neurology, Memorial Sloan Kettering Cancer Center, New York, New York, United States of America
| | - Rami Z. Morsi
- Department of Neurology, University of Chicago, Chicago, Illinois, United States of America
| | - Abdallah El-Kurdi
- Department of Biochemistry and Molecular Genetics, American University of Beirut, Beirut, Lebanon
| | - Georges Nemer
- Department of Biochemistry and Molecular Genetics, American University of Beirut, Beirut, Lebanon
| | - Rami Mahfouz
- Department of Pathology and Laboratory Medicine, American University of Beirut Medical Center, Beirut, Lebanon
| | - Maya Charafeddine
- Division of Hematology and Oncology, Department of Internal Medicine, American University of Beirut Medical Center, Beirut, Lebanon
| | - Jessica Khoury
- Division of Hematology and Oncology, Department of Internal Medicine, American University of Beirut Medical Center, Beirut, Lebanon
| | - Marwan W. Najjar
- Division of Neurosurgery, Department of Surgery, American University of Beirut Medical Center, Beirut, Lebanon
| | - Pierre Khoueiry
- Department of Biochemistry and Molecular Genetics, American University of Beirut, Beirut, Lebanon
- * E-mail: (PK); (HIA)
| | - Hazem I. Assi
- Division of Hematology and Oncology, Department of Internal Medicine, American University of Beirut Medical Center, Beirut, Lebanon
- * E-mail: (PK); (HIA)
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Majd N, Yap TA, Yung WKA, de Groot J. The Promise of Poly(ADP-Ribose) Polymerase (PARP) Inhibitors in Gliomas. JOURNAL OF IMMUNOTHERAPY AND PRECISION ONCOLOGY 2020; 3:157-164. [PMID: 35665372 PMCID: PMC9165443 DOI: 10.36401/jipo-20-20] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Accepted: 07/29/2020] [Indexed: 05/09/2023]
Abstract
Diffuse infiltrating gliomas are a clinically and molecularly heterogeneous group of tumors that are uniformly incurable. Despite our growing knowledge of genomic and epigenomic alterations in gliomas, standard treatments have not changed in the past 2 decades and remain limited to surgical resection, ionizing radiation, and alkylating chemotherapeutic agents. Development of novel therapeutics for diffuse gliomas has been challenging due to inter- and intra-tumoral heterogeneity, diffuse infiltrative nature of gliomas, inadequate tumor/drug concentration due to blood-brain barrier, and an immunosuppressive tumor microenvironment. Given the high frequency of DNA damage pathway alterations in gliomas, researchers have focused their efforts in targeting the DNA damage pathways for the treatment of gliomas. A growing body of data has shed light on the role of poly(ADP-ribose) polymerase (PARP) in combination with radiation and temozolomide in high-grade gliomas. Furthermore, a novel therapeutic strategy in low-grade glioma is the recent elucidation for a potential role of PARP inhibitors in gliomas with IDH1/2 mutations. This review highlights the concepts behind targeting PARP in gliomas with a focus on putative predictive biomarkers of response. We further discuss the challenges involved in the successful development of PARP inhibitors in gliomas, including the intracranial location of the tumor and overlapping toxicities with current standards of care, and promising strategies to overcome these hurdles.
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Affiliation(s)
- Nazanin Majd
- Department of Neuro-Oncology, University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Timothy A. Yap
- Department of Investigational Cancer Therapeutics, University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - W. K. Alfred Yung
- Department of Neuro-Oncology, University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - John de Groot
- Department of Neuro-Oncology, University of Texas MD Anderson Cancer Center, Houston, TX, USA
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Sinha A, Saleh A, Endersby R, Yuan SH, Chokshi CR, Brown KR, Kuzio B, Kauppinen T, Singh SK, Baker SJ, McKinnon PJ, Katyal S. RAD51-Mediated DNA Homologous Recombination Is Independent of PTEN Mutational Status. Cancers (Basel) 2020; 12:cancers12113178. [PMID: 33138032 PMCID: PMC7693555 DOI: 10.3390/cancers12113178] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Accepted: 10/20/2020] [Indexed: 12/22/2022] Open
Abstract
Simple Summary PTEN is an important tumor suppressor that is frequently mutated in malignancy. PTEN mutational loss has been associated with reduced RAD51 expression and homologous recombination deficiency (HRD), however; recent studies have failed to recapitulate these findings. Here, we show that RAD51 expression, foci formation and homologous recombination repair activity are unaltered in normal and tumorigenic PTEN-deficient cells and patient samples. Furthermore, we show that PTEN-deficient tumor cell lines do not synergize with the clinical PARP inhibitor olaparib, underscoring a need to discontinue its use in treating patients with PTEN-deficient tumors that do not otherwise exhibit HRD. Abstract PTEN mutation occurs in a variety of aggressive cancers and is associated with poor patient outcomes. Recent studies have linked mutational loss of PTEN to reduced RAD51 expression and function, a key factor involved in the homologous recombination (HR) pathway. However, these studies remain controversial, as they fail to establish a definitive causal link to RAD51 expression that is PTEN-dependent, while other studies have not been able to recapitulate the relationship between the PTEN expression and the RAD51/HR function. Resolution of this apparent conundrum is essential due to the clinically-significant implication that PTEN-deficient tumors may be sensitive to poly (ADP-ribose) polymerase (PARP) inhibitors (PARPi) commonly used in the clinical management of BRCA-mutated and other HR-deficient (HRD) tumors. Methods: Primary Pten-deficient (and corresponding wild-type) mouse embryonic fibroblasts (MEFs) and astrocytes and PTEN-null human tumor cell lines and primary cells were assessed for RAD51 expression (via the Western blot analysis) and DNA damage repair analyses (via alkali comet and γH2AX foci assays). RAD51 foci analysis was used to measure HR-dependent DNA repair. Xrcc2-deficient MEFs served as an HR-deficient control, while the stable knockdown of RAD51 (shRAD51) served to control for the relative RAD51/HR-mediated repair and the phospho-53BP1 foci analysis served to confirm and measure non-homologous end joining (NHEJ) activity in PTEN-deficient and shRAD51-expressing (HRD) lines. Cell proliferation studies were used to measure any potential added sensitivity of PTEN-null cells to the clinically-relevant PARPi, olaparib. RAD51 levels and DNA damage response signaling were assessed in PTEN-mutant brain tumor initiating cells (BTICs) derived from primary and recurrent glioblastoma multiforme (GBM) patients, while expression of RAD51 and its paralogs were examined as a function of the PTEN status in the RNA expression datasets isolated from primary GBM tumor specimens and BTICs. Results: Pten knockout primary murine cells display unaltered RAD51 expression, endogenous and DNA strand break-induced RAD51 foci and robust DNA repair activity. Defective HR was only observed in the cells lacking Xrcc2. Likewise, human glioblastoma multiforme (GBM) cell lines with known PTEN deficiency (U87, PTEN-mutated; U251 and U373, PTEN-null) show apparent expression of RAD51 and display efficient DNA repair activity. Only GBM cells stably expressing shRNAs against RAD51 (shRAD51) display dysfunctional DNA repair activity and reduced proliferative capacity, which is exacerbated by PARPi treatment. Furthermore, GBM patient-derived BTICs displayed robust RAD51 expression and intact DNA damage response signaling in spite of PTEN-inactivating mutations. RNA expression analysis of primary GBM tissue specimens and BTICs demonstrate stable levels of RAD51 and its paralogs (RAD51B, RAD51C, RAD51D, XRCC2, XRCC3, and DMC1), regardless of the PTEN mutational status. Conclusions: Our findings demonstrate definitively that PTEN loss does not alter the RAD51 expression, its paralogs, or the HR activity. Furthermore, deficiency in PTEN alone is not sufficient to impart enhanced sensitivity to PARPi associated with HRD. This study is the first to unequivocally demonstrate that PTEN deficiency is not linked to the RAD51 expression or the HR activity amongst primary neural and non-neural Pten-null cells, PTEN-deficient tumor cell lines, and primary PTEN-mutant GBM patient-derived tissue specimens and BTICs.
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Affiliation(s)
- Asha Sinha
- Department of Pharmacology and Therapeutics, University of Manitoba, Winnipeg, MB R3E 0T6, Canada; (A.S.); (A.S.); (S.H.Y.); (B.K.); (T.K.)
- Research Institute in Oncology and Hematology, CancerCare Manitoba, Winnipeg, MB R3E 0V9, Canada
| | - Ali Saleh
- Department of Pharmacology and Therapeutics, University of Manitoba, Winnipeg, MB R3E 0T6, Canada; (A.S.); (A.S.); (S.H.Y.); (B.K.); (T.K.)
- Research Institute in Oncology and Hematology, CancerCare Manitoba, Winnipeg, MB R3E 0V9, Canada
| | - Raelene Endersby
- Telethon Kids Institute, Perth Children’s Hospital, 15 Hospital Avenue, Perth, WA 6009, Australia;
- Centre for Child Health Research, University of Western Australia, 15 Hospital Avenue, Perth, WA 6009, Australia
| | - Shek H. Yuan
- Department of Pharmacology and Therapeutics, University of Manitoba, Winnipeg, MB R3E 0T6, Canada; (A.S.); (A.S.); (S.H.Y.); (B.K.); (T.K.)
- Research Institute in Oncology and Hematology, CancerCare Manitoba, Winnipeg, MB R3E 0V9, Canada
| | - Chirayu R. Chokshi
- Department of Biochemistry and Biomedical Sciences, McMaster University, 1200 Main Street West, Hamilton, ON L8S 4L8, Canada; (C.R.C.); (S.K.S.)
| | - Kevin R. Brown
- Donnelly Centre, University of Toronto, 160 College St, Toronto, ON M5S 3E1, Canada;
| | - Bozena Kuzio
- Department of Pharmacology and Therapeutics, University of Manitoba, Winnipeg, MB R3E 0T6, Canada; (A.S.); (A.S.); (S.H.Y.); (B.K.); (T.K.)
- Research Institute in Oncology and Hematology, CancerCare Manitoba, Winnipeg, MB R3E 0V9, Canada
| | - Tiina Kauppinen
- Department of Pharmacology and Therapeutics, University of Manitoba, Winnipeg, MB R3E 0T6, Canada; (A.S.); (A.S.); (S.H.Y.); (B.K.); (T.K.)
- Neuroscience Research Program, Kleysen Institute for Advanced Medicine, Health Sciences Centre, 710 William Avenue, Winnipeg, MB R3E 0Z3, Canada
| | - Sheila K. Singh
- Department of Biochemistry and Biomedical Sciences, McMaster University, 1200 Main Street West, Hamilton, ON L8S 4L8, Canada; (C.R.C.); (S.K.S.)
- Department of Surgery, Faculty of Health Sciences, McMaster University, 1200 Main Street West, Hamilton, ON L8S 4L8, Canada
| | - Suzanne J. Baker
- Department of Developmental Neurobiology, St Jude Children’s Research Hospital, Memphis, TN 38105-3678, USA;
| | - Peter J. McKinnon
- Department of Genetics, St Jude Children’s Research Hospital, Memphis, TN 38105-3678, USA;
| | - Sachin Katyal
- Department of Pharmacology and Therapeutics, University of Manitoba, Winnipeg, MB R3E 0T6, Canada; (A.S.); (A.S.); (S.H.Y.); (B.K.); (T.K.)
- Research Institute in Oncology and Hematology, CancerCare Manitoba, Winnipeg, MB R3E 0V9, Canada
- Correspondence: ; Tel.: +1-204-787-2765; Fax: +1-204-787-2190
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Rieckhoff J, Meyer F, Classen S, Zielinski A, Riepen B, Wikman H, Petersen C, Rothkamm K, Borgmann K, Parplys AC. Exploiting Chromosomal Instability of PTEN-Deficient Triple-Negative Breast Cancer Cell Lines for the Sensitization against PARP1 Inhibition in a Replication-Dependent Manner. Cancers (Basel) 2020; 12:cancers12102809. [PMID: 33003585 PMCID: PMC7601067 DOI: 10.3390/cancers12102809] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 09/11/2020] [Accepted: 09/25/2020] [Indexed: 12/16/2022] Open
Abstract
Simple Summary The poor prognosis of patients with TNBC have fostered a major effort to identify more patients who would benefit from targeted therapies. Here we recognize PTEN as a potential CIN-causing gene in TNBC and consider PTEN-deficient TNBC for the treatment with PARP1 inhibitors due to the protective role of PTEN during DNA replication. Abstract Chromosomal instability (CIN) is an emerging hallmark of cancer and its role in therapeutic responses has been increasingly attracting the attention of the research community. To target the vulnerability of tumors with high CIN, it is important to identify the genes and mechanisms involved in the maintenance of CIN. In our work, we recognize the tumor suppressor gene Phosphatase and Tensin homolog (PTEN) as a potential gene causing CIN in triple-negative breast cancer (TNBC) and show that TNBC with low expression levels of PTEN can be sensitized for the treatment with poly-(ADP-ribose)-polymerase 1 (PARP1) inhibitors, independent of Breast Cancer (BRCA) mutations or a BRCA-like phenotype. In silico analysis of mRNA expression data from 200 TNBC patients revealed low expression of PTEN in tumors with a high CIN70 score. Western blot analysis of TNBC cell lines confirm lower protein expression of PTEN compared to non TNBC cell lines. Further, PTEN-deficient cell lines showed cellular sensitivity towards PARP1 inhibition treatment. DNA fiber assays and examination of chromatin bound protein fractions indicate a protective role of PTEN at stalled replication forks. In this study, we recognize PTEN as a potential CIN-causing gene in TNBC and identify its important role in the replication processes.
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Affiliation(s)
- Johanna Rieckhoff
- Laboratory of Radiobiology & Experimental Radio Oncology, Centre of Oncology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany; (J.R.); (F.M.); (S.C.); (A.Z.); (B.R.); (K.R.); (K.B.)
| | - Felix Meyer
- Laboratory of Radiobiology & Experimental Radio Oncology, Centre of Oncology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany; (J.R.); (F.M.); (S.C.); (A.Z.); (B.R.); (K.R.); (K.B.)
| | - Sandra Classen
- Laboratory of Radiobiology & Experimental Radio Oncology, Centre of Oncology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany; (J.R.); (F.M.); (S.C.); (A.Z.); (B.R.); (K.R.); (K.B.)
| | - Alexandra Zielinski
- Laboratory of Radiobiology & Experimental Radio Oncology, Centre of Oncology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany; (J.R.); (F.M.); (S.C.); (A.Z.); (B.R.); (K.R.); (K.B.)
| | - Britta Riepen
- Laboratory of Radiobiology & Experimental Radio Oncology, Centre of Oncology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany; (J.R.); (F.M.); (S.C.); (A.Z.); (B.R.); (K.R.); (K.B.)
| | - Harriet Wikman
- Department of Tumor Biology, Center of Experimental Medicine, University Medical Center, Hamburg-Eppendorf, 20246 Hamburg, Germany;
| | - Cordula Petersen
- Department of Radiotherapy and Radio Oncology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany;
| | - Kai Rothkamm
- Laboratory of Radiobiology & Experimental Radio Oncology, Centre of Oncology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany; (J.R.); (F.M.); (S.C.); (A.Z.); (B.R.); (K.R.); (K.B.)
| | - Kerstin Borgmann
- Laboratory of Radiobiology & Experimental Radio Oncology, Centre of Oncology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany; (J.R.); (F.M.); (S.C.); (A.Z.); (B.R.); (K.R.); (K.B.)
| | - Ann Christin Parplys
- Laboratory of Radiobiology & Experimental Radio Oncology, Centre of Oncology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany; (J.R.); (F.M.); (S.C.); (A.Z.); (B.R.); (K.R.); (K.B.)
- Correspondence:
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Bryant J, White L, Coen N, Shields L, McClean B, Meade AD, Lyng FM, Howe O. MicroRNA Analysis of ATM-Deficient Cells Indicate PTEN and CCDN1 as Potential Biomarkers of Radiation Response. Radiat Res 2020; 193:520-530. [PMID: 32216710 DOI: 10.1667/rr15462.1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Accepted: 03/06/2020] [Indexed: 11/03/2022]
Abstract
Genetic and epigenetic profile changes associated with individual radiation sensitivity are well documented and have led to enhanced understanding of the mechanisms of the radiation-induced DNA damage response. However, the search continues to identify reliable biomarkers of individual radiation sensitivity. Herein, we report on a multi-biomarker approach using traditional cytogenetic biomarkers, DNA damage biomarkers and transcriptional microRNA (miR) biomarkers coupled with their potential gene targets to identify radiosensitivity in ataxia-telangiectasia mutated (ATM)-deficient lymphoblastoid cell lines (LCL); ATM-proficient cell lines were used as controls. Cells were 0.05 and 0.5 Gy irradiated, using a linear accelerator, with sham-irradiated cells as controls. At 1 h postirradiation, cells were fixed for γ-H2AX analysis as a measurement of DNA damage, and cytogenetic analysis using the G2 chromosomal sensitivity assay, G-banding and FISH techniques. RNA was also isolated for genetic profiling by microRNA (miR) and RT-PCR analysis. A panel of 752 miR were analyzed, and potential target genes, phosphatase and tensin homolog (PTEN) and cyclin D1 (CCND1), were measured. The cytogenetic assays revealed that although the control cell line had functional cell cycle checkpoints, the radiosensitivity of the control and AT cell lines were similar. Analysis of DNA damage in all cell lines, including an additional control cell line, showed elevated γ-H2AX levels for only one AT cell line. Of the 752 miR analyzed, eight miR were upregulated, and six miR were downregulated in the AT cells compared to the control. Upregulated miR-152-3p, miR-24-5p and miR-92-15p and all downregulated miR were indicated as modulators of PTEN and CCDN1. Further measurement of both genes validated their potential role as radiation-response biomarkers. The multi-biomarker approach not only revealed potential candidates for radiation response, but provided additional mechanistic insights into the response in AT-deficient cells.
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Affiliation(s)
- Jane Bryant
- Radiation and Environmental Science Centre (RESC), FOCAS Research Institute
| | - Lisa White
- Radiation and Environmental Science Centre (RESC), FOCAS Research Institute.,School of Biological and Health Sciences, Technological University Dublin, City Campus, Dublin 8, Ireland
| | - Natasha Coen
- Department of Clinical Genetics, Division of Cytogenetics, Our Lady's Children's Hospital, Crumlin, Dublin 12, Ireland
| | - Laura Shields
- Medical Physics Department, St Luke's Radiation Oncology Centre, Rathgar, Dublin 6, Ireland
| | - Brendan McClean
- Medical Physics Department, St Luke's Radiation Oncology Centre, Rathgar, Dublin 6, Ireland
| | - Aidan D Meade
- Radiation and Environmental Science Centre (RESC), FOCAS Research Institute.,School of Physics & Clinical & Optometric Sciences, Technological University Dublin, City Campus, Dublin 8, Ireland
| | - Fiona M Lyng
- Radiation and Environmental Science Centre (RESC), FOCAS Research Institute.,School of Physics & Clinical & Optometric Sciences, Technological University Dublin, City Campus, Dublin 8, Ireland
| | - Orla Howe
- Radiation and Environmental Science Centre (RESC), FOCAS Research Institute.,School of Biological and Health Sciences, Technological University Dublin, City Campus, Dublin 8, Ireland
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Musacchio L, Caruso G, Pisano C, Cecere SC, Di Napoli M, Attademo L, Tambaro R, Russo D, Califano D, Palaia I, Muzii L, Benedetti Panici P, Pignata S. PARP Inhibitors in Endometrial Cancer: Current Status and Perspectives. Cancer Manag Res 2020; 12:6123-6135. [PMID: 32801862 PMCID: PMC7383016 DOI: 10.2147/cmar.s221001] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2020] [Accepted: 07/08/2020] [Indexed: 12/24/2022] Open
Abstract
Advanced, recurrent and metastatic endometrial cancer (EC) has a dismal prognosis due to poor response rates to conventional treatments. In the era of precision medicine, the improved understanding of cancer genetics and molecular biology has led to the development of targeted therapies, such as poly (ADP-ribose) polymerase (PARP) inhibitors. This class of drugs that inhibit PARP enzymes has been investigated in many different types of tumors and its use in the treatment of gynecological malignancies has rapidly increased over the past few years. Data from several clinical trials showed that PARP inhibitors have a beneficial role in cancers with a defect in the homologous DNA recombination system, regardless of the BRCA mutational status. Since EC frequently shows mutations in PTEN and TP53 genes, indirectly involved in the homologous DNA recombination pathway, several in vivo and in vitro studies investigated the efficacy of PARP inhibitors in EC, showing promising results. This review will discuss the use of PARP inhibitors in endometrial cancer, summarizing data from preclinical studies and providing an overview of the ongoing trials, with a special focus on the development of combined treatment strategies with PARP inhibitors and immune checkpoint inhibitors.
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Affiliation(s)
- Lucia Musacchio
- Department of Maternal and Child Health and Urological Sciences, University "Sapienza", Policlinico Umberto I, Rome, Italy
| | - Giuseppe Caruso
- Department of Maternal and Child Health and Urological Sciences, University "Sapienza", Policlinico Umberto I, Rome, Italy
| | - Carmela Pisano
- Department of Urology and Gynecology, Istituto Nazionale Tumori IRCCS "Fondazione G. Pascale", Naples, Italy
| | - Sabrina Chiara Cecere
- Department of Urology and Gynecology, Istituto Nazionale Tumori IRCCS "Fondazione G. Pascale", Naples, Italy
| | - Marilena Di Napoli
- Department of Urology and Gynecology, Istituto Nazionale Tumori IRCCS "Fondazione G. Pascale", Naples, Italy
| | - Laura Attademo
- Department of Urology and Gynecology, Istituto Nazionale Tumori IRCCS "Fondazione G. Pascale", Naples, Italy
| | - Rosa Tambaro
- Department of Urology and Gynecology, Istituto Nazionale Tumori IRCCS "Fondazione G. Pascale", Naples, Italy
| | - Daniela Russo
- Functional Genomic Unit, Istituto Nazionale Tumori IRCCS "Fondazione G. Pascale", Naples, Italy
| | - Daniela Califano
- Functional Genomic Unit, Istituto Nazionale Tumori IRCCS "Fondazione G. Pascale", Naples, Italy
| | - Innocenza Palaia
- Department of Maternal and Child Health and Urological Sciences, University "Sapienza", Policlinico Umberto I, Rome, Italy
| | - Ludovico Muzii
- Department of Maternal and Child Health and Urological Sciences, University "Sapienza", Policlinico Umberto I, Rome, Italy
| | - Pierluigi Benedetti Panici
- Department of Maternal and Child Health and Urological Sciences, University "Sapienza", Policlinico Umberto I, Rome, Italy
| | - Sandro Pignata
- Department of Urology and Gynecology, Istituto Nazionale Tumori IRCCS "Fondazione G. Pascale", Naples, Italy
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Poly (ADP-Ribose) Polymerase 1 Protein Expression in Normal Pancreas and Pancreatic Adenocarcinoma. Case Rep Gastrointest Med 2020; 2020:2717150. [PMID: 32850156 PMCID: PMC7436278 DOI: 10.1155/2020/2717150] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/30/2019] [Revised: 02/16/2020] [Accepted: 06/11/2020] [Indexed: 11/17/2022] Open
Abstract
Pancreatic cancer is a most frequent cancer in Europe, and the majority of cases of cancer of the pancreas are diagnosed above the age of 65. Radical surgery is the first curative treatment of pancreatic cancer, and alternative or combined therapeutic options, in particular, consist of adjuvant or neoadjuvant chemotherapy, with or without radiotherapy. Many factors, including diet and genetics, have been implicated in the development of cancer of the pancreas. Poly (ADP-ribose) polymerase 1 (PARP-1) protein is required for translocation of the apoptosis-inducing factor (AIF) from the mitochondria to the nucleus. It is involved in programmed cell death processes. Different PARP-1 gene expression proteins have been observed in various tumors such as lung, ovarian, endometrial, skin, and glioblastoma. We evaluated the expression of PARP-1 protein in pancreatic adenocarcinoma and normal pancreas tissues by immunohistochemistry. Protein PARP-1 in the nucleus was found in all samples (normal pancreas and pancreatic adenocarcinoma tissues). No cytoplasmic staining was observed in any sample. PARP-1-positive cells resulted higher in the normal pancreas compared with the pancreas with adenocarcinoma. PARP-1 overexpression in prostate cancer tissue compared with normal prostate suggests a greater activity of PARP-1 in these tumors. These findings suggest that PARP-1 expression in prostate cancer is an attempt to trigger apoptosis in this type of tumor, similarl to that reported in other cancers. This finding suggests that PARP-1-mediated cell death pathways are inhibited in this cancer.
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Adaku N, Park HB, Spakowicz DJ, Tiwari MK, Strobel SA, Crawford JM, Rogers FA. A DNA Repair Inhibitor Isolated from an Ecuadorian Fungal Endophyte Exhibits Synthetic Lethality in PTEN-Deficient Glioblastoma. JOURNAL OF NATURAL PRODUCTS 2020; 83:1899-1908. [PMID: 32407116 DOI: 10.1021/acs.jnatprod.0c00012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Disruption of the tumor suppressor PTEN, either at the protein or genomic level, plays an important role in human cancer development. The high frequency of PTEN deficiency reported across several cancer subtypes positions therapeutic approaches that exploit PTEN loss-of-function with the ability to significantly impact the treatment strategies of a large patient population. Here, we report that an endophytic fungus isolated from a medicinal plant produces an inhibitor of DNA double-strand-break repair. Furthermore, the novel alkaloid product, which we have named irrepairzepine (1), demonstrated synthetic lethal targeting in PTEN-deficient glioblastoma cells. Our results uncover a new therapeutic lead for PTEN-deficient cancers and an important molecular tool toward enhancing the efficacy of current cancer treatments.
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Affiliation(s)
- Nneoma Adaku
- Department of Therapeutic Radiology, Yale School of Medicine, New Haven, Connecticut 06520, United States
| | - Hyun Bong Park
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
- Chemical Biology Institute, Yale University, West Haven, Connecticut 06516, United States
| | - Daniel J Spakowicz
- Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Meetu Kaushik Tiwari
- Department of Therapeutic Radiology, Yale School of Medicine, New Haven, Connecticut 06520, United States
| | - Scott A Strobel
- Chemical Biology Institute, Yale University, West Haven, Connecticut 06516, United States
- Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Jason M Crawford
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
- Chemical Biology Institute, Yale University, West Haven, Connecticut 06516, United States
- Department of Microbial Pathogenesis, Yale School of Medicine, New Haven, Connecticut 06536, United States
| | - Faye A Rogers
- Department of Therapeutic Radiology, Yale School of Medicine, New Haven, Connecticut 06520, United States
- Yale Cancer Center, Yale School of Medicine, New Haven, Connecticut 06520, United States
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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: 218] [Impact Index Per Article: 54.5] [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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Zhao L, Li R, Qiu JZ, Yu JB, Cao Y, Yuan RT. YY1-mediated PTEN dephosphorylation antagonizes IR-induced DNA repair contributing to tongue squamous cell carcinoma radiosensitization. Mol Cell Probes 2020; 53:101577. [PMID: 32334006 DOI: 10.1016/j.mcp.2020.101577] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Revised: 04/06/2020] [Accepted: 04/15/2020] [Indexed: 12/14/2022]
Abstract
Ionizing radiation (IR) confers a survival advantage in tongue squamous cell carcinoma (TSCC), however, IR resistance limits its efficacy. Although Yin Yang 1 (YY1) has been reported to play a role in genotoxic drug resistance by accelerating DNA repair, its role in TSCC radioresistance remains unclear. In this study, we examined YY1 mRNA and protein expression in human tongue cancer samples using qRT-PCR and western blotting, respectively. DNA array data identified YY1 mRNA expression in IR sensitivity or resistance cell lines and tissues. Tongue carcinoma primary cells and CAL27 cells with YY1 stably overexpressed or knocked-down were exposed to IR and evaluated for cell proliferation and apoptosis by CCK8-assay and caspase-3 assay, respectively. We also examined DNA damage- or repair-related indicators, such as YY1, p-H2AX, nuclear PTEN, p-PTEN, and Rad51 through Western blot analysis. Additionally, we explored the mechanism of IR-induced PTEN nuclear translocation by introducing a series of PTEN phosphorylation site mutations and co-IP assay. We observed that YY1 mRNA and protein are highly expressed in TSCC tissues, which was correlated with worse overall survival. Moreover, higher expression of YY1 and Rad51 was observed in radioresistant cells and tissues, overexpression of YY1 led to IR resistance in TSCC cells, whereas YY1 knockdown sensitized TSCC cells to IR. The underlying mechanism showed that the overexpression of YY1 upregulated nuclear PTEN and Rad51 expression, which is essential for DNA repair. IR upregulated YY1, nuclear PTEN, and Rad51; thus, knockdown of YY1 completely blocked IR-induced upregulation of nuclear PTEN/Rad51. IR upregulated PTEN phosphorylation, and mutation of the phosphorylation site of Ser380 nearly completely blocked IR-induced PTEN nuclear translocation. Furthermore, the phosphatase PP2A negatively regulated pS380-PTEN, and knockdown of YY1 completely blocked IR-induced pS380-PTEN through PP2A. In conclusion, knockdown of YY1 enhanced TSCC radiosensitivity through PP2A-mediated dephosphorylation of PTEN Ser380; thus, antagonizing the IR-induced nuclear PTEN/Rad51 axis and targeting YY1 may reverse IR resistance in TSCC.
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Affiliation(s)
- Lu Zhao
- Center of Oral Medicine, Qingdao Municipal Hospital, #5 Donghai Middle Road, Qingdao, 266000, PR China; School of Stomatology, Qingdao University, #19 JiangSu Road, Qingdao, 266000, PR China
| | - Ran Li
- Department of Oral and Maxillo-facial Surgery, Weifang Medical University Affiliated Qingdao Stomatological Hospital, #17 Dexian Road, Qingdao, 266000, PR China
| | - Jian-Zhong Qiu
- Center of Oral Medicine, Qingdao Municipal Hospital, #5 Donghai Middle Road, Qingdao, 266000, PR China; School of Stomatology, Qingdao University, #19 JiangSu Road, Qingdao, 266000, PR China
| | - Jiang-Bo Yu
- Center of Oral Medicine, Qingdao Municipal Hospital, #5 Donghai Middle Road, Qingdao, 266000, PR China; School of Stomatology, Qingdao University, #19 JiangSu Road, Qingdao, 266000, PR China
| | - Yang Cao
- Center of Oral Medicine, Qingdao Municipal Hospital, #5 Donghai Middle Road, Qingdao, 266000, PR China; School of Stomatology, Qingdao University, #19 JiangSu Road, Qingdao, 266000, PR China
| | - Rong-Tao Yuan
- Center of Oral Medicine, Qingdao Municipal Hospital, #5 Donghai Middle Road, Qingdao, 266000, PR China; School of Stomatology, Qingdao University, #19 JiangSu Road, Qingdao, 266000, PR China.
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IDH mutation in glioma: molecular mechanisms and potential therapeutic targets. Br J Cancer 2020; 122:1580-1589. [PMID: 32291392 PMCID: PMC7250901 DOI: 10.1038/s41416-020-0814-x] [Citation(s) in RCA: 309] [Impact Index Per Article: 77.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Revised: 01/24/2020] [Accepted: 03/02/2020] [Indexed: 02/06/2023] Open
Abstract
Isocitrate dehydrogenase (IDH) enzymes catalyse the oxidative decarboxylation of isocitrate and therefore play key roles in the Krebs cycle and cellular homoeostasis. Major advances in cancer genetics over the past decade have revealed that the genes encoding IDHs are frequently mutated in a variety of human malignancies, including gliomas, acute myeloid leukaemia, cholangiocarcinoma, chondrosarcoma and thyroid carcinoma. A series of seminal studies further elucidated the biological impact of the IDH mutation and uncovered the potential role of IDH mutants in oncogenesis. Notably, the neomorphic activity of the IDH mutants establishes distinctive patterns in cancer metabolism, epigenetic shift and therapy resistance. Novel molecular targeting approaches have been developed to improve the efficacy of therapeutics against IDH-mutated cancers. Here we provide an overview of the latest findings in IDH-mutated human malignancies, with a focus on glioma, discussing unique biological signatures and proceedings in translational research.
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Sousa JFD, Serafim RB, Freitas LMD, Fontana CR, Valente V. DNA repair genes in astrocytoma tumorigenesis, progression and therapy resistance. Genet Mol Biol 2019; 43:e20190066. [PMID: 31930277 PMCID: PMC7198033 DOI: 10.1590/1678-4685-gmb-2019-0066] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Accepted: 07/21/2019] [Indexed: 12/26/2022] Open
Abstract
Glioblastoma (GBM) is the most common and malignant type of primary brain tumor,
showing rapid development and resistance to therapies. On average, patients
survive 14.6 months after diagnosis and less than 5% survive five years or more.
Several pieces of evidence have suggested that the DNA damage signaling and
repair activities are directly correlated with GBM phenotype and exhibit
opposite functions in cancer establishment and progression. The functions of
these pathways appear to present a dual role in tumorigenesis and cancer
progression. Activation and/or overexpression of ATRX, ATM and RAD51 genes were
extensively characterized as barriers for GBM initiation, but paradoxically the
exacerbated activity of these genes was further associated with cancer
progression to more aggressive stages. Excessive amounts of other DNA repair
proteins, namely HJURP, EXO1, NEIL3, BRCA2, and BRIP, have also been connected
to proliferative competence, resistance and poor prognosis. This scenario
suggests that these networks help tumor cells to manage replicative stress and
treatment-induced damage, diminishing genome instability and conferring therapy
resistance. Finally, in this review we address promising new drugs and
therapeutic approaches with potential to improve patient survival. However,
despite all technological advances, the prognosis is still dismal and further
research is needed to dissect such complex mechanisms.
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Affiliation(s)
- Juliana Ferreira de Sousa
- Radiation Oncology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD, U.S.A
| | - Rodolfo Bortolozo Serafim
- Universidade de São Paulo, Faculdade de Medicina de Ribeirão Preto, Departamento de Biologia Celular e Molecular e Bioagentes Patogênicos, Universidade de São Paulo, Ribeirão Preto, SP, Brazil
| | - Laura Marise de Freitas
- Universidade de São Paulo, Instituto de Química, Departamento de Bioquímica, São Paulo, SP, Brazil
| | - Carla Raquel Fontana
- Universidade Estadual Paulista "Júlio de Mesquita Filho" (UNESP), Faculdade de Ciências Farmacêuticas, Departamento de Análises Clínicas, Araraquara, SP, Brazil
| | - Valeria Valente
- Universidade de São Paulo, Faculdade de Medicina de Ribeirão Preto, Departamento de Biologia Celular e Molecular e Bioagentes Patogênicos, Universidade de São Paulo, Ribeirão Preto, SP, Brazil.,Universidade Estadual Paulista "Júlio de Mesquita Filho" (UNESP), Faculdade de Ciências Farmacêuticas, Departamento de Análises Clínicas, Araraquara, SP, Brazil.,Centro de Terapia Celular (CEPID-FAPESP), Ribeirão Preto, SP, Brazil
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Pulido R, Mingo J, Gaafar A, Nunes-Xavier CE, Luna S, Torices L, Angulo JC, López JI. Precise Immunodetection of PTEN Protein in Human Neoplasia. Cold Spring Harb Perspect Med 2019; 9:cshperspect.a036293. [PMID: 31501265 DOI: 10.1101/cshperspect.a036293] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
PTEN is a major tumor-suppressor protein whose expression and biological activity are frequently diminished in sporadic or inherited cancers. PTEN gene deletion or loss-of-function mutations favor tumor cell growth and are commonly found in clinical practice. In addition, diminished PTEN protein expression is also frequently observed in tumor samples from cancer patients in the absence of PTEN gene alterations. This makes PTEN protein levels a potential biomarker parameter in clinical oncology, which can guide therapeutic decisions. The specific detection of PTEN protein can be achieved by using highly defined anti-PTEN monoclonal antibodies (mAbs), characterized with precision in terms of sensitivity for the detection technique, specificity for PTEN binding, and constraints of epitope recognition. This is especially relevant taking into consideration that PTEN is highly targeted by mutations and posttranslational modifications, and different PTEN protein isoforms exist. The precise characterization of anti-PTEN mAb reactivity is an important step in the validation of these reagents as diagnostic and prognostic tools in clinical oncology, including their routine use in analytical immunohistochemistry (IHC). Here, we review the current status on the use of well-defined anti-PTEN mAbs for PTEN immunodetection in the clinical context and discuss their potential usefulness and limitations for a more precise cancer diagnosis and patient benefit.
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Affiliation(s)
- Rafael Pulido
- Biocruces Bizkaia Health Research Institute, Barakaldo 48903, Spain.,Ikerbasque, Basque Foundation for Science, Bilbao 48011, Spain
| | - Janire Mingo
- Biocruces Bizkaia Health Research Institute, Barakaldo 48903, Spain
| | - Ayman Gaafar
- Department of Pathology, Cruces University Hospital, Barakaldo 48903, Spain
| | - Caroline E Nunes-Xavier
- Biocruces Bizkaia Health Research Institute, Barakaldo 48903, Spain.,Department of Tumor Biology, Institute for Cancer Research, Oslo University Hospital Radiumhospitalet, Oslo N-0310, Norway
| | - Sandra Luna
- Biocruces Bizkaia Health Research Institute, Barakaldo 48903, Spain
| | - Leire Torices
- Biocruces Bizkaia Health Research Institute, Barakaldo 48903, Spain
| | - Javier C Angulo
- Department of Urology, University Hospital of Getafe, Getafe, Madrid 28904, Spain.,Clinical Department, European University of Madrid, Laureate Universities, Madrid 28904, Spain
| | - José I López
- Biocruces Bizkaia Health Research Institute, Barakaldo 48903, Spain.,Department of Pathology, Cruces University Hospital, Barakaldo 48903, Spain.,University of the Basque Country, Leioa 48940, Spain
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PTEN in Colorectal Cancer: Shedding Light on Its Role as Predictor and Target. Cancers (Basel) 2019; 11:cancers11111765. [PMID: 31717544 PMCID: PMC6896095 DOI: 10.3390/cancers11111765] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2019] [Revised: 10/31/2019] [Accepted: 11/06/2019] [Indexed: 12/11/2022] Open
Abstract
Molecular assessment of colorectal cancer (CRC) is receiving growing attention, beyond RAS and BRAF, because of its influence on prognosis and prediction in cancer treatment. PTEN (phosphatase and tensin homologue), a tumor suppressor, regulating cell division and apoptosis, has been explored, and significant evidence suggests a role in cetuximab and panitumumab resistance linked to the epidermal growth factor receptor (EGFR) signal transduction pathway. Factors influencing PTEN activity should be analyzed to develop strategies to maximize the tumor suppressor role and to improve tumor response to cancer treatment. Therefore, an in-depth knowledge of the PI3K-Akt pathway—one of the major cancer survival pathways—and the role of PTEN—a major brake of this pathway—is essential in the era of precision medicine. The purpose of this literature review is to summarize the role of PTEN as a predictive factor and possible therapeutic target in CRC, focusing on ongoing studies and the possible implications in clinical practice.
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44
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Brito C, Azevedo A, Esteves S, Marques AR, Martins C, Costa I, Mafra M, Bravo Marques JM, Roque L, Pojo M. Clinical insights gained by refining the 2016 WHO classification of diffuse gliomas with: EGFR amplification, TERT mutations, PTEN deletion and MGMT methylation. BMC Cancer 2019; 19:968. [PMID: 31623593 PMCID: PMC6798410 DOI: 10.1186/s12885-019-6177-0] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Accepted: 09/20/2019] [Indexed: 01/09/2023] Open
Abstract
BACKGROUND Significant advances in the molecular profiling of gliomas, led the 2016 World Health Organization (WHO) Classification to include, for the first-time, molecular biomarkers in glioma diagnosis: IDH mutations and 1p/19q codeletion. Here, we evaluated the effect of this new classification in the stratification of gliomas previously diagnosed according to 2007 WHO classification. Then, we also analyzed the impact of TERT promoter mutations, PTEN deletion, EGFR amplification and MGMT promoter methylation in diagnosis, prognosis and response to therapy in glioma molecular subgroup. METHODS A cohort of 444 adult gliomas was analyzed and reclassified according to the 2016 WHO. Mutational analysis of IDH1 and TERT promoter mutations was performed by Sanger sequencing. Statistical analysis was done using SPSS Statistics 21.0. RESULTS The reclassification of this cohort using 2016 WHO criteria led to a decrease of the number of oligodendrogliomas (from 82 to 49) and an increase of astrocytomas (from 49 to 98), while glioblastomas (GBM) remained the same (n = 256). GBM was the most common diagnosis (57.7%), of which 55.2% were IDH-wildtype. 1p/19q codeleted gliomas were the subgroup associated with longer median overall survival (198 months), while GBM IDH-wildtype had the worst outcome (10 months). Interestingly, PTEN deletion had poor prognostic value in astrocytomas IDH-wildtype (p = 0.015), while in GBM IDH-wildtype was associated with better overall survival (p = 0.042) as well as MGMT promoter methylation (p = 0.009). EGFR amplification and TERT mutations had no impact in prognosis. Notably, EGFR amplification predicted a better response to radiotherapy (p = 0.011) and MGMT methylation to chemo-radiotherapy (p = 0.003). CONCLUSION In this study we observed that the 2016 WHO classification improved the accuracy of diagnosis and prognosis of diffuse gliomas, although the available biomarkers are not enough. Therefore, we suggest MGMT promoter methylation should be added to glioma classification. Moreover, we found two genetic/clinical correlations that must be evaluated to understand their impact in the clinical setting: i) how is PTEN deletion a favorable prognostic factor in GBM IDH wildtype and an unfavorable prognostic factor in astrocytoma IDH wildtype and ii) how EGFR amplification is an independent and strong factor of response to radiotherapy.
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Affiliation(s)
- Cheila Brito
- Unidade de Investigação em Patobiologia Molecular (UIPM) do Instituto Português de Oncologia de Lisboa Francisco Gentil E.P.E., Rua Prof. Lima Basto, 1099-023, Lisbon, Portugal
| | - Ana Azevedo
- Serviço de Neurologia do Instituto Português de Oncologia de Lisboa Francisco Gentil E.P.E., Rua Prof. Lima Basto, 1099-023, Lisbon, Portugal.,Faculty of Health Sciences, University of Beira Interior, 6200-506, Covilhã, Portugal
| | - Susana Esteves
- Unidade de Investigação Clínica (UIC) do Instituto Português de Oncologia de Lisboa Francisco Gentil E.P.E., Rua Prof. Lima Basto, 1099-023, Porto, Portugal
| | - Ana Rita Marques
- Unidade de Investigação em Patobiologia Molecular (UIPM) do Instituto Português de Oncologia de Lisboa Francisco Gentil E.P.E., Rua Prof. Lima Basto, 1099-023, Lisbon, Portugal
| | - Carmo Martins
- Unidade de Investigação em Patobiologia Molecular (UIPM) do Instituto Português de Oncologia de Lisboa Francisco Gentil E.P.E., Rua Prof. Lima Basto, 1099-023, Lisbon, Portugal
| | - Ilda Costa
- Serviço de Neurologia do Instituto Português de Oncologia de Lisboa Francisco Gentil E.P.E., Rua Prof. Lima Basto, 1099-023, Lisbon, Portugal
| | - Manuela Mafra
- Serviço de Anatomia Patológica do Instituto Português de Oncologia de Lisboa Francisco Gentil E.P.E, Rua Prof. Lima Basto, 1099-023, Lisbon, Portugal
| | - José M Bravo Marques
- Serviço de Neurologia do Instituto Português de Oncologia de Lisboa Francisco Gentil E.P.E., Rua Prof. Lima Basto, 1099-023, Lisbon, Portugal
| | - Lúcia Roque
- Unidade de Investigação em Patobiologia Molecular (UIPM) do Instituto Português de Oncologia de Lisboa Francisco Gentil E.P.E., Rua Prof. Lima Basto, 1099-023, Lisbon, Portugal
| | - Marta Pojo
- Unidade de Investigação em Patobiologia Molecular (UIPM) do Instituto Português de Oncologia de Lisboa Francisco Gentil E.P.E., Rua Prof. Lima Basto, 1099-023, Lisbon, Portugal.
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Sargazi S, Saravani R, Zavar Reza J, Zarei Jaliani H, Galavi H, Moudi M, Alsadat Abtahi N. Novel Poly(Adenosine Diphosphate-Ribose) Polymerase (PARP) Inhibitor, AZD2461, Down-Regulates VEGF and Induces Apoptosis in Prostate Cancer Cells. IRANIAN BIOMEDICAL JOURNAL 2019; 23. [PMID: 31102368 PMCID: PMC6661129 DOI: 10.29252/.23.5.312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
Background Prostate cancer (Pca) is a heterogeneous disease, and current treatments are not based on molecular stratification. Poly(adenosine diphosphate [ADP]-ribose) polymerase (PARP) inhibitors have recently been found to be remarkably toxic to cells with defects in homologous recombination, particularly cells with BRCA-mutated backgrounds. Therefore, this preliminary study was designed to evaluate whether PTEN expression status could have an impact on the sensitivity of invasive Pca cells to the PARP inhibitor, AZD2461. Methods MTT viability test, Annexin V‐FITC/propidium iodide double staining, and caspase3 activity assay were used to evaluate the apoptosis and relative expression of PTEN and VEGF in PC-3 and DU145 cell lines using real-time PCR. Results MTT results showed that the inhibitory effects of AZD2461 were higher in PC-3 than DU145 cells (with IC50 of 36.48 and 59.03 µM at 48 hours of treatment, respectively). Flow cytometric analysis also showed the same results. When exposed to 40 µM of AZD2461, PC-3 (38.8%) and DU145 (28%) cells underwent apoptosis (p < 0.05). Treatment of cells by AZD2461 also caused a significant increase in apoptosis through caspase3 activation in both cell lines. VEGF mRNA levels in PC-3 cells significantly decreased compared to adjusted untreated cells (p < 0.05) in all measured times while displaying different alteration patterns in DU145 cells (p < 0.05). Conclusion AZD2461 suppresses the growth of prostate tumor cells since AZD2461 monotherapy could prove to be efficacious, especially against cells not expressing PTEN besides activating the possible apoptosis-independent cell death pathways.
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Affiliation(s)
- Saman Sargazi
- International Campus, Shahid Sadoughi University of Medical Sciences, Yazd, Iran;,Biotechnology Research Center, International Campus, Shahid Sadoughi University of Medical Science, Yazd, Iran
| | - Ramin Saravani
- Department of Clinical Biochemistry, School of Medicine, Zahedan University of Medical Sciences, Zahedan, Iran;,Cellular and Molecular Research Center of Zahedan University of Medical Sciences, Zahedan, Iran;,Corresponding Authors: Ramin Saravani , Cellular and Molecular Research Center and Department of Clinical Biochemistry, School of Medicine, Zahedan University of Medical Sciences, Zahedan, Iran; Mobile: (+98-915) 5432609; E-mail: . Javad Zavar Reza, Department of Clinical Biochemistry, School of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran; Mobile.: (+98-912) 5028742; E-mail:
| | - Javad Zavar Reza
- Biotechnology Research Center, International Campus, Shahid Sadoughi University of Medical Science, Yazd, Iran;,Department of Clinical Biochemistry, School of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran;,Corresponding Authors: Ramin Saravani , Cellular and Molecular Research Center and Department of Clinical Biochemistry, School of Medicine, Zahedan University of Medical Sciences, Zahedan, Iran; Mobile: (+98-915) 5432609; E-mail: . Javad Zavar Reza, Department of Clinical Biochemistry, School of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran; Mobile.: (+98-912) 5028742; E-mail:
| | - Hossein Zarei Jaliani
- Protein Engineering Laboratory, Department of Medical Genetics, School of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Hamidreza Galavi
- Cellular and Molecular Research Center of Zahedan University of Medical Sciences, Zahedan, Iran;,Clinical Immunology Research Center of Zahedan University of Medical Sciences, Zahedan, Iran
| | - Mahdiyeh Moudi
- Genetics of Non-Communicable Disease Research Center of Zahedan University of Medical Sciences, Zahedan, Iran
| | - Najmeh Alsadat Abtahi
- International Campus, Shahid Sadoughi University of Medical Sciences, Yazd, Iran;,Biotechnology Research Center, International Campus, Shahid Sadoughi University of Medical Science, Yazd, Iran
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46
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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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Hoppe MM, Sundar R, Tan DSP, Jeyasekharan AD. Biomarkers for Homologous Recombination Deficiency in Cancer. J Natl Cancer Inst 2019; 110:704-713. [PMID: 29788099 DOI: 10.1093/jnci/djy085] [Citation(s) in RCA: 208] [Impact Index Per Article: 41.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2018] [Accepted: 04/06/2018] [Indexed: 12/11/2022] Open
Abstract
Defective DNA repair is a common hallmark of cancer. Homologous recombination is a DNA repair pathway of clinical interest due to the sensitivity of homologous recombination-deficient cells to poly-ADP ribose polymerase (PARP) inhibitors. The measurement of homologous recombination deficiency (HRD) in cancer is therefore vital to the appropriate design of clinical trials incorporating PARP inhibitors. However, methods to identify HRD in tumors are varied and controversial. Understanding existing and new methods to measure HRD is important to their appropriate use in clinical trials and practice. The aim of this review is to summarize the biology and clinical validation of current methods to measure HRD, to aid decision-making for patient stratification and translational research in PARP inhibitor trials. We discuss the current clinical development of PARP inhibitors, along with established indicators for HRD such as germline BRCA1/2 mutation status and clinical response to platinum-based therapy. We then examine newer assays undergoing clinical validation, including 1) somatic mutations in homologous recombination genes, 2) "genomic scar" assays using array-based comparative genomic hybridization (aCGH), single nucleotide polymorphism (SNP) analysis or mutational signatures derived from next-generation sequencing, 3) transcriptional profiles of HRD, and 4) phenotypic or functional assays of protein expression and localization. We highlight the strengths and weaknesses of each of these assays, for consideration during the design of studies involving PARP inhibitors.
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Affiliation(s)
- Michal M Hoppe
- Cancer Science Institute of Singapore, National University Hospital, Singapore
| | - Raghav Sundar
- Department of Haematology-Oncology, National University Hospital, Singapore
| | - David S P Tan
- Cancer Science Institute of Singapore, National University Hospital, Singapore.,Department of Haematology-Oncology, National University Hospital, Singapore
| | - Anand D Jeyasekharan
- Cancer Science Institute of Singapore, National University Hospital, Singapore.,Department of Haematology-Oncology, National University Hospital, Singapore
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48
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Liu Y, Tang ZG, Yang JQ, Zhou Y, Lin Y, Lv W, Wang GB, Li CL. Effect of silencing S-phase kinase-associated protein 2 on chemosensitivity to temozolomide of human glioma cells U251. Am J Transl Res 2019; 11:2470-2476. [PMID: 31105854 PMCID: PMC6511802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Accepted: 01/16/2019] [Indexed: 06/09/2023]
Abstract
OBJECTIVE To examine the effect of silencing SKP2 on chemosensitivity of human glioma cells U251 to temozolomide (TMZ). METHODS Adenoviruses harbouring shRNA targeting SKP2 (i.e. Ad-shSKP2) and non-targeting scrambled shRNA (i.e. Ad-shNC) were used to infect U251 cells. The transduced cells were then treated with TMZ. Cell viability after treatment was assayed using CCK8; while cell cycle and apoptosis were examined using flow cytometry. To study the effect of silencing SKP2 on autophagy in U251, we co-transduced the cells with Ad-mRFP-LC3 and Ad-shSKP2/Ad-shNC. The expression of autophagy marker LC3 after TMZ treatment was studied using microscopy and Western blotting assays. RESULTS The cytotoxicity of TMZ (i.e. 20-100 µM) was more significantly seen in Ad-shSKP2-transduced U251 cells than in the Ad-shNC-transduced U251 cells. The IC50 values in shSKP2-U251 were significantly lower than those of the shNC-U251 (P < 0.05). Both TMZ and Ad-shSKP2 alone increased apoptosis and promoted expression of LC3 in U251. Combined treatment of Ad-shSKP2 and TMZ further elevated apoptosis and LC3 expression. CONCLUSION Silencing SKP2 in U251 cells increased chemosensitivity to TMZ that was accompanied with enhanced apoptosis and autophagy. Targeting SKP2 may be a potential approach to potentiate TMZ treatment in patients with glioma.
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Affiliation(s)
- Yue Liu
- Department of Neurosurgery, Renmin Hospital, Hubei University of Medicine Shiyan, Hubei, P.R. China
| | - Zhen-Gang Tang
- Department of Neurosurgery, Renmin Hospital, Hubei University of Medicine Shiyan, Hubei, P.R. China
| | - Jian-Quan Yang
- Department of Neurosurgery, Renmin Hospital, Hubei University of Medicine Shiyan, Hubei, P.R. China
| | - Yi Zhou
- Department of Neurosurgery, Renmin Hospital, Hubei University of Medicine Shiyan, Hubei, P.R. China
| | - Yi Lin
- Department of Neurosurgery, Renmin Hospital, Hubei University of Medicine Shiyan, Hubei, P.R. China
| | - Wei Lv
- Department of Neurosurgery, Renmin Hospital, Hubei University of Medicine Shiyan, Hubei, P.R. China
| | - Guo-Bin Wang
- Department of Neurosurgery, Renmin Hospital, Hubei University of Medicine Shiyan, Hubei, P.R. China
| | - Cai-Li Li
- Department of Neurosurgery, Renmin Hospital, Hubei University of Medicine Shiyan, Hubei, P.R. China
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Kaina B, Christmann M. DNA repair in personalized brain cancer therapy with temozolomide and nitrosoureas. DNA Repair (Amst) 2019; 78:128-141. [PMID: 31039537 DOI: 10.1016/j.dnarep.2019.04.007] [Citation(s) in RCA: 78] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Revised: 04/11/2019] [Accepted: 04/14/2019] [Indexed: 12/16/2022]
Abstract
Alkylating agents have been used since the 60ties in brain cancer chemotherapy. Their target is the DNA and, although the DNA of normal and cancer cells is damaged unselectively, they exert tumor-specific killing effects because of downregulation of some DNA repair activities in cancer cells. Agents exhibiting methylating properties (temozolomide, procarbazine, dacarbazine, streptozotocine) induce at least 12 different DNA lesions. These are repaired by damage reversal mechanisms involving the alkyltransferase MGMT and the alkB homologous protein ALKBH2, and through base excision repair (BER). There is a strong correlation between the MGMT expression level and therapeutic response in high-grade malignant glioma, supporting the notion that O6-methylguanine and, for nitrosoureas, O6-chloroethylguanine are the most relevant toxic damages at therapeutically relevant doses. Since MGMT has a significant impact on the outcome of anti-cancer therapy, it is a predictive marker of the effectiveness of methylating anticancer drugs, and clinical trials are underway aimed at assessing the influence of MGMT inhibition on the therapeutic success. Other DNA repair factors involved in methylating drug resistance are mismatch repair, DNA double-strand break (DSB) repair by homologous recombination (HR) and DSB signaling. Base excision repair and ALKBH2 might also contribute to alkylating drug resistance and their downregulation may have an impact on drug sensitivity notably in cells expressing a high amount of MGMT and at high doses of temozolomide, but the importance in a therapeutic setting remains to be shown. MGMT is frequently downregulated in cancer cells (up to 40% in glioblastomas), which is due to CpG promoter methylation. Astrocytoma (grade III) are frequently mutated in isocitrate dehydrogenase (IDH1). These tumors show a surprisingly good therapeutic response. IDH1 mutation has an impact on ALKBH2 activity thus influencing DNA repair. A master switch between survival and death is p53, which often retains transactivation activity (wildtype) in malignant glioma. The role of p53 in regulating survival via DNA repair and the routes of death are discussed and conclusions as to cancer therapeutic options were drawn.
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Affiliation(s)
- Bernd Kaina
- Institute of Toxicology, University Medical Center Mainz, Obere Zahlbacher Str. 67, D-55131 Mainz, Germany.
| | - Markus Christmann
- Institute of Toxicology, University Medical Center Mainz, Obere Zahlbacher Str. 67, D-55131 Mainz, Germany
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Turchick A, Liu Y, Zhao W, Cohen I, Glazer PM. Synthetic lethality of a cell-penetrating anti-RAD51 antibody in PTEN-deficient melanoma and glioma cells. Oncotarget 2019; 10:1272-1283. [PMID: 30863489 PMCID: PMC6407680 DOI: 10.18632/oncotarget.26654] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Accepted: 01/09/2019] [Indexed: 12/14/2022] Open
Abstract
PTEN is a tumor suppressor that is highly mutated in a variety of human cancers. Recent studies have suggested a link between PTEN loss and deficiency in the non-homologous end-joining (NHEJ) pathway of DNA double strand break (DSB) repair. As a means to achieve synthetic lethality in this context, we tested the effect of 3E10, a cell-penetrating autoantibody that inhibits RAD51, a key factor in the alternative pathway of DSB repair, homology dependent repair (HDR). We report here that treatment of PTEN-deficient glioma cells with 3E10 leads to an accumulation of DNA damage causing decreased proliferation and increased cell death compared to isogenic PTEN proficient controls. Similarly, 3E10 was synthetically lethal to a series of PTEN-deficient, patient-derived primary melanoma cell populations. Further, 3E10 was found to synergize with a small molecule inhibitor of the ataxia telangiectasia and Rad3-related (ATR) protein, a DNA damage checkpoint kinase, in both PTEN-deficient glioma cells and primary melanoma cells. These results point to a targeted synthetic lethal strategy to treat PTEN-deficient cancers through a combination designed to disrupt both DNA repair and DNA damage checkpoint signaling.
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Affiliation(s)
- Audrey Turchick
- Department of Genetics, Yale University School of Medicine, New Haven, CT, USA
| | - Yanfeng Liu
- Department of Therapeutic Radiology, Yale University School of Medicine, New Haven, CT, USA
| | - Weixi Zhao
- Department of Therapeutic Radiology, Yale University School of Medicine, New Haven, CT, USA
| | - Inessa Cohen
- Department of Therapeutic Radiology, Yale University School of Medicine, New Haven, CT, USA
| | - Peter M. Glazer
- Department of Genetics, Yale University School of Medicine, New Haven, CT, USA
- Department of Therapeutic Radiology, Yale University School of Medicine, New Haven, CT, USA
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