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O'Brien S, Ubhi T, Wolf L, Gandhi K, Lin S, Chaudary N, Dhani NC, Milosevic M, Brown GW, Angers S. FBXW7-loss Sensitizes Cells to ATR Inhibition Through Induced Mitotic Catastrophe. CANCER RESEARCH COMMUNICATIONS 2023; 3:2596-2607. [PMID: 38032106 PMCID: PMC10734389 DOI: 10.1158/2767-9764.crc-23-0306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Revised: 09/27/2023] [Accepted: 11/28/2023] [Indexed: 12/01/2023]
Abstract
FBXW7 is a commonly mutated tumor suppressor gene that functions to regulate numerous oncogenes involved in cell-cycle regulation. Genome-wide CRISPR fitness screens identified a signature of DNA repair and DNA damage response genes as required for the growth of FBXW7-knockout cells. Guided by these findings, we show that FBXW7-mutant cells have high levels of replication stress, which results in a genotype-specific vulnerability to inhibition of the ATR signaling pathway, as these mutant cells become heavily reliant on a robust S-G2 checkpoint. ATR inhibition induces an accelerated S-phase, leading to mitotic catastrophe and cell death caused by the high replication stress present in FBXW7-/- cells. In addition, we provide evidence in cell and organoid studies, and mining of publicly available high-throughput drug screening efforts, that this genotype-specific vulnerability extends to multiple types of cancer, providing a rational means of identifying responsive patients for targeted therapy. SIGNIFICANCE We have elucidated the synthetic lethal interactions between FBXW7 mutation and DNA damage response genes, and highlighted the potential of ATR inhibitors as targeted therapies for cancers harboring FBXW7 alterations.
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Affiliation(s)
- Siobhan O'Brien
- Department of Biochemistry, University of Toronto, Ontario, Canada
- Terrence Donnelly Centre for Cellular and Biomolecular Research, Toronto, Ontario, Canada
| | - Tajinder Ubhi
- Department of Biochemistry, University of Toronto, Ontario, Canada
- Terrence Donnelly Centre for Cellular and Biomolecular Research, Toronto, Ontario, Canada
| | - Lucie Wolf
- Terrence Donnelly Centre for Cellular and Biomolecular Research, Toronto, Ontario, Canada
| | - Krishna Gandhi
- Terrence Donnelly Centre for Cellular and Biomolecular Research, Toronto, Ontario, Canada
| | - Sichun Lin
- Terrence Donnelly Centre for Cellular and Biomolecular Research, Toronto, Ontario, Canada
| | - Naz Chaudary
- Princess Margaret Cancer Centre, Toronto, Ontario, Canada
- Ontario Cancer Institute, Toronto, Ontario, Canada
| | | | - Michael Milosevic
- Princess Margaret Cancer Centre, Toronto, Ontario, Canada
- Department of Radiation Oncology, University of Toronto, Ontario, Canada
- Institute of Medical Science, University of Toronto, Ontario, Canada
| | - Grant W. Brown
- Department of Biochemistry, University of Toronto, Ontario, Canada
- Terrence Donnelly Centre for Cellular and Biomolecular Research, Toronto, Ontario, Canada
| | - Stephane Angers
- Department of Biochemistry, University of Toronto, Ontario, Canada
- Terrence Donnelly Centre for Cellular and Biomolecular Research, Toronto, Ontario, Canada
- Leslie Dan Faculty of Pharmacy, University of Toronto, Ontario, Canada
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2
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Brown M, Leon A, Kedzierska K, Moore C, Belnoue‐Davis HL, Flach S, Lydon JP, DeMayo FJ, Lewis A, Bosse T, Tomlinson I, Church DN. Functional analysis reveals driver cooperativity and novel mechanisms in endometrial carcinogenesis. EMBO Mol Med 2023; 15:e17094. [PMID: 37589076 PMCID: PMC10565641 DOI: 10.15252/emmm.202217094] [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: 10/24/2022] [Revised: 08/01/2023] [Accepted: 08/02/2023] [Indexed: 08/18/2023] Open
Abstract
High-risk endometrial cancer has poor prognosis and is increasing in incidence. However, understanding of the molecular mechanisms which drive this disease is limited. We used genetically engineered mouse models (GEMM) to determine the functional consequences of missense and loss of function mutations in Fbxw7, Pten and Tp53, which collectively occur in nearly 90% of high-risk endometrial cancers. We show that Trp53 deletion and missense mutation cause different phenotypes, with the latter a substantially stronger driver of endometrial carcinogenesis. We also show that Fbxw7 missense mutation does not cause endometrial neoplasia on its own, but potently accelerates carcinogenesis caused by Pten loss or Trp53 missense mutation. By transcriptomic analysis, we identify LEF1 signalling as upregulated in Fbxw7/FBXW7-mutant mouse and human endometrial cancers, and in human isogenic cell lines carrying FBXW7 mutation, and validate LEF1 and the additional Wnt pathway effector TCF7L2 as novel FBXW7 substrates. Our study provides new insights into the biology of high-risk endometrial cancer and suggests that targeting LEF1 may be worthy of investigation in this treatment-resistant cancer subgroup.
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Affiliation(s)
- Matthew Brown
- Cancer Genomics and Immunology Group, Wellcome Centre for Human GeneticsUniversity of OxfordOxfordUK
- Oxford NIHR Comprehensive Biomedical Research Centre, Oxford University Hospitals NHS Foundation TrustOxfordUK
| | - Alicia Leon
- Department of PathologyLeiden University Medical CenterLeidenThe Netherlands
| | - Katarzyna Kedzierska
- Cancer Genomics and Immunology Group, Wellcome Centre for Human GeneticsUniversity of OxfordOxfordUK
| | - Charlotte Moore
- Cancer Genomics and Immunology Group, Wellcome Centre for Human GeneticsUniversity of OxfordOxfordUK
| | - Hayley L Belnoue‐Davis
- Gastrointestinal Stem Cell Biology Laboratory, Wellcome Centre for Human GeneticsUniversity of OxfordOxfordUK
| | - Susanne Flach
- Department of Otorhinolaryngology, Head and Neck SurgeryLMU KlinikumMunichGermany
- German Cancer Consortium (DKTK), Partner SiteMunichGermany
| | - John P Lydon
- Department of Molecular and Cellular BiologyBaylor College of MedicineHoustonTXUSA
| | - Francesco J DeMayo
- Reproductive and Developmental Biology LaboratoryNational Institute of Environmental Health SciencesResearch Triangle ParkNCUSA
| | - Annabelle Lewis
- Department of Life Sciences, College of Health, Medicine and Life SciencesBrunel University LondonUxbridgeUK
| | - Tjalling Bosse
- Department of PathologyLeiden University Medical CenterLeidenThe Netherlands
| | - Ian Tomlinson
- Institute of Genetics and CancerThe University of EdinburghEdinburghUK
| | - David N Church
- Cancer Genomics and Immunology Group, Wellcome Centre for Human GeneticsUniversity of OxfordOxfordUK
- Oxford NIHR Comprehensive Biomedical Research Centre, Oxford University Hospitals NHS Foundation TrustOxfordUK
- Oxford Cancer Centre, Churchill HospitalOxford University Hospitals Foundation NHS TrustOxfordUK
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3
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Koo SY, Park EJ, Noh HJ, Jo SM, Ko BK, Shin HJ, Lee CW. Ubiquitination Links DNA Damage and Repair Signaling to Cancer Metabolism. Int J Mol Sci 2023; 24:ijms24098441. [PMID: 37176148 PMCID: PMC10179089 DOI: 10.3390/ijms24098441] [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: 04/12/2023] [Revised: 05/04/2023] [Accepted: 05/05/2023] [Indexed: 05/15/2023] Open
Abstract
Changes in the DNA damage response (DDR) and cellular metabolism are two important factors that allow cancer cells to proliferate. DDR is a set of events in which DNA damage is recognized, DNA repair factors are recruited to the site of damage, the lesion is repaired, and cellular responses associated with the damage are processed. In cancer, DDR is commonly dysregulated, and the enzymes associated with DDR are prone to changes in ubiquitination. Additionally, cellular metabolism, especially glycolysis, is upregulated in cancer cells, and enzymes in this metabolic pathway are modulated by ubiquitination. The ubiquitin-proteasome system (UPS), particularly E3 ligases, act as a bridge between cellular metabolism and DDR since they regulate the enzymes associated with the two processes. Hence, the E3 ligases with high substrate specificity are considered potential therapeutic targets for treating cancer. A number of small molecule inhibitors designed to target different components of the UPS have been developed, and several have been tested in clinical trials for human use. In this review, we discuss the role of ubiquitination on overall cellular metabolism and DDR and confirm the link between them through the E3 ligases NEDD4, APC/CCDH1, FBXW7, and Pellino1. In addition, we present an overview of the clinically important small molecule inhibitors and implications for their practical use.
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Affiliation(s)
- Seo-Young Koo
- Department of Molecular Cell Biology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Suwon 16419, Republic of Korea
| | - Eun-Ji Park
- Department of Molecular Cell Biology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Suwon 16419, Republic of Korea
| | - Hyun-Ji Noh
- Department of Molecular Cell Biology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Suwon 16419, Republic of Korea
| | - Su-Mi Jo
- Department of Molecular Cell Biology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Suwon 16419, Republic of Korea
| | - Bo-Kyoung Ko
- Department of Molecular Cell Biology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Suwon 16419, Republic of Korea
| | - Hyun-Jin Shin
- Team of Radiation Convergence Research, Korea Institute of Radiological & Medical Sciences, Seoul 01812, Republic of Korea
| | - Chang-Woo Lee
- Department of Molecular Cell Biology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Suwon 16419, Republic of Korea
- SKKU Institute for Convergence, Sungkyunkwan University, Suwon 16419, Republic of Korea
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4
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Pan Y, Liu J, Gao Y, Guo Y, Wang C, Liang Z, Wu M, Qian Y, Li Y, Shen J, Lu C, Ma S. FBXW7 loss of function promotes esophageal squamous cell carcinoma progression via elevating MAP4 and ERK phosphorylation. J Exp Clin Cancer Res 2023; 42:75. [PMID: 36991467 PMCID: PMC10054043 DOI: 10.1186/s13046-023-02630-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Accepted: 02/23/2023] [Indexed: 03/31/2023] Open
Abstract
BACKGROUND Increasing evidence suggests that FBXW7 has a high frequency of mutations in esophageal squamous cell carcinoma (ESCC). However, the function of FBXW7, especially the mutations, is not clear. This study was designed to investigate the functional significance of FBXW7 loss of function and underlying mechanism in ESCC. METHODS Immunofluorescence was applied to clarify the localization and main isoform of FBXW7 in ESCC cells. Sanger sequencing were performed to explore mutations of FBXW7 in ESCC tissues. Proliferation, colony, invasion and migration assays were performed to examine the functional roles of FBXW7 in ESCC cells in vitro and in vivo. Real-time RT-PCR, immunoblotting, GST-pulldown, LC-MS/MS and co-immunoprecipitation assay were used to explore the molecular mechanism underlying the actions of FBXW7 functional inactivation in ESCC cells. Immunohistochemical staining were used to explore the expression of FBXW7 and MAP4 in ESCC tissues. RESULTS The main FBXW7 isoform in ESCC cells was the β transcript in the cytoplasm. Functional inactivation of FBXW7 led to activation of the MAPK signaling pathway and upregulation of the downstream MMP3 and VEGFA, which enhanced tumor proliferation cell invasion and migration. Among the five mutation forms screened, S327X (X means truncated mutation) had an effect similar to the FBXW7 deficiency and led to the inactivation of FBXW7 in ESCC cells. Three other point mutations, S382F, D400N and R425C, attenuated but did not eliminate FBXW7 function. The other truncating mutation, S598X, which was located outside of the WD40 domain, revealed a tiny attenuation of FBXW7 in ESCC cells. Notably, MAP4 was identified as a potential target of FBXW7. The threonine T521 of MAP4, which was phosphorylated by CHEK1, played a key role in the FBXW7-related degradation system. Immunohistochemical staining indicated that FBXW7 loss of function was associated with tumor stage and shorter survival of patients with ESCC. Univariate and multivariate Cox proportional hazards regression analyses showed that high FBXW7 and low MAP4 was an independent prognostic indicator and prospective longer survival. Moreover, a combination regimen that included MK-8353 to inhibit the phosphorylation of ERK and bevacizumab to inhibit VEGFA produced potent inhibitory effects on the growth of FBXW7 inactivation xenograft tumors in vivo. CONCLUSIONS This study provided evidence that FBXW7 loss of function promoted ESCC via MAP4 overexpression and ERK phosphorylation, and this novel FBXW7/MAP4/ERK axis may be an efficient target for ESCC treatment.
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Affiliation(s)
- Yunzhi Pan
- Department of Pharmacy, The Affiliated Infectious Diseases Hospital, Suzhou Medical College of Soochow University, Suzhou, 215007, China
| | - Jing Liu
- State Key Laboratory of Molecular Oncology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100021, China
| | - Yingyin Gao
- Affiliated Hospital of Integrated Traditional Chinese and Western Medicine, Nanjing University of Traditional Chinese Medicine, Nanjing, 210023, China
| | - Yuqing Guo
- Department of Pharmacy, The Affiliated Infectious Diseases Hospital, Suzhou Medical College of Soochow University, Suzhou, 215007, China
| | - Changxing Wang
- Department of Thoracic Surgery, The Affiliated Suzhou Hospital of Nanjing Medical University, Suzhou, 215008, China
- Gusu School, Nanjing Medical University, Suzhou, 215008, China
| | - Zhipan Liang
- Department of Thoracic Surgery, The Affiliated Suzhou Hospital of Nanjing Medical University, Suzhou, 215008, China
- Gusu School, Nanjing Medical University, Suzhou, 215008, China
| | - Meiying Wu
- Department of Tuberculosis, The Affiliated Infectious Diseases Hospital, Suzhou Medical College of Soochow University, Suzhou, 215007, China
| | - Yulan Qian
- Department of Pharmacy, The First Affiliated Hospital of Soochow University, Suzhou, 215006, China
| | - Yinyan Li
- Department of Anatomy, Bengbu Medical College, Bengbu, 233030, China
| | - Jingyi Shen
- Department of Anatomy, Bengbu Medical College, Bengbu, 233030, China
| | - Chenchen Lu
- Department of Anatomy, Bengbu Medical College, Bengbu, 233030, China.
| | - Sai Ma
- Gusu School, Nanjing Medical University, Suzhou, 215008, China.
- Department of Laboratory, The Affiliated Suzhou Hospital of Nanjing Medical University, Suzhou, 215008, China.
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5
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Liu Y, Chen H, Bao H, Zhang J, Wu R, Zhu L. Comprehensive characterization of FBXW7 mutational and clinicopathological profiles in human colorectal cancers. Front Oncol 2023; 13:1154432. [PMID: 37064111 PMCID: PMC10091464 DOI: 10.3389/fonc.2023.1154432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Accepted: 03/13/2023] [Indexed: 03/31/2023] Open
Abstract
BackgroundFBXW7 is recognized as a critical tumor suppressor gene and a component of the ubiquitin-proteasome system, mediating the degradation of multiple oncogenic proteins, including c-MYC, Cyclin E, c-Jun, Notch, p53. Around 16% of colorectal cancer (CRC) patients carried FBXW7 somatic mutations, while a comprehensive characterization of FBXW7 somatic mutations in CRC is still lacking.MethodsColorectal cancer patients with tumor samples and matching white blood cell samples in the past five years were screened and DNA sequenced. DNA sequencing data of MSK MetTropism cohort and RNA sequencing data of TCGA COAD cohort were analyzed.ResultsWe discovered that the FBXW7 mutations were associated with higher tumor mutation burden (TMB), higher microsatellite instability (MSI) score, and lower chromosomal instability (CIN) score. Patients with FBXW7 mutations showed better overall survival (HR: 0.67; 95%CI: 0.55-0.80, P < 0.001). However, patients with FBXW7 R465C mutation displayed worse overall survival in multi-variate cox analysis when compared with patients carrying other FBXW7 mutations (HR: 1.6; 95%CI: 1.13-3.1, P = 0.015), and with all other patients (HR: 1.87; 95%CI: 0.99-2.5, P = 0.053). Moreover, in MSI patients, the FBXW7 mutated group showed higher M1 macrophage, CD8+ T cell, and regulatory T cell (Tregs) infiltration rates, and significant enrichment of multiple immune-related gene sets, including interferon-gamma response, interferon-alpha response, IL6 JAK STAT3 signaling, p53 pathway.ConclusionThis analysis comprehensively identified FBXW7 alterations in colorectal cancer patients and uncovered the molecular, clinicopathological, and immune-related patterns of FBXW7-altered CRC patients.
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Affiliation(s)
- Yiping Liu
- Department of Oncology, Xiangya Hospital, Central South University, Changsha, China
| | - Hanlin Chen
- Geneseeq Research Institute, Nanjing Geneseeq Technology Inc., Nanjing, China
| | - Hua Bao
- Geneseeq Research Institute, Nanjing Geneseeq Technology Inc., Nanjing, China
| | - Jinfeng Zhang
- Geneseeq Research Institute, Nanjing Geneseeq Technology Inc., Nanjing, China
| | - Runda Wu
- Department of General Surgery, The First Affiliated Hospital of Soochow University, Suzhou, China
- *Correspondence: Runda Wu, ; Lingjun Zhu,
| | - Lingjun Zhu
- Department of Oncology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
- *Correspondence: Runda Wu, ; Lingjun Zhu,
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6
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Belmonte-Fernández A, Herrero-Ruíz J, Galindo-Moreno M, Limón-Mortés MC, Mora-Santos M, Sáez C, Japón MÁ, Tortolero M, Romero F. Cisplatin-induced cell death increases the degradation of the MRE11-RAD50-NBS1 complex through the autophagy/lysosomal pathway. Cell Death Differ 2023; 30:488-499. [PMID: 36477079 PMCID: PMC9950126 DOI: 10.1038/s41418-022-01100-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Revised: 11/17/2022] [Accepted: 11/25/2022] [Indexed: 12/12/2022] Open
Abstract
Cisplatin and other platinum-based anticancer agents are among the most widely used chemotherapy drugs in the treatment of different types of cancer. However, it is common to find patients who respond well to treatment at first but later relapse due to the appearance of resistance to cisplatin. Among the mechanisms responsible for this phenomenon is the increase in DNA damage repair. Here, we elucidate the effect of cisplatin on the MRN (MRE11-RAD50-NBS1) DNA damage sensor complex. We found that the tumor suppressor FBXW7 is a key factor in controlling the turnover of the MRN complex by inducing its degradation through lysosomes. Inhibition of lysosomal enzymes allowed the detection of the association of FBXW7-dependent ubiquitylated MRN with LC3 and the autophagy adaptor p62/SQSTM1 and the localization of MRN in lysosomes. Furthermore, cisplatin-induced cell death increased MRN degradation, suggesting that this complex is one of the targets that favor cell death. These findings open the possibility of using the induction of the degradation of the MRN complex after genotoxic damage as a potential therapeutic strategy to eliminate tumor cells.
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Affiliation(s)
| | - Joaquín Herrero-Ruíz
- Departamento de Microbiología, Facultad de Biología, Universidad de Sevilla, Sevilla, E-41012, Spain
| | - María Galindo-Moreno
- Departamento de Microbiología, Facultad de Biología, Universidad de Sevilla, Sevilla, E-41012, Spain
| | - M Cristina Limón-Mortés
- Departamento de Microbiología, Facultad de Biología, Universidad de Sevilla, Sevilla, E-41012, Spain
| | - Mar Mora-Santos
- Departamento de Microbiología, Facultad de Biología, Universidad de Sevilla, Sevilla, E-41012, Spain
| | - Carmen Sáez
- Instituto de Biomedicina de Sevilla (IBiS) and Departamento de Anatomía Patológica, Hospital Universitario Virgen del Rocío, Sevilla, E-41013, Spain
| | - Miguel Á Japón
- Instituto de Biomedicina de Sevilla (IBiS) and Departamento de Anatomía Patológica, Hospital Universitario Virgen del Rocío, Sevilla, E-41013, Spain
| | - Maria Tortolero
- Departamento de Microbiología, Facultad de Biología, Universidad de Sevilla, Sevilla, E-41012, Spain
| | - Francisco Romero
- Departamento de Microbiología, Facultad de Biología, Universidad de Sevilla, Sevilla, E-41012, Spain.
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7
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Palmer N, Talib SZA, Goh CMF, Biswas K, Sharan SK, Kaldis P. Identification PMS1 and PMS2 as potential meiotic substrates of CDK2 activity. PLoS One 2023; 18:e0283590. [PMID: 36952545 PMCID: PMC10035876 DOI: 10.1371/journal.pone.0283590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Accepted: 03/11/2023] [Indexed: 03/25/2023] Open
Abstract
Cyclin dependent-kinase 2 (CDK2) plays important functions during the mitotic cell cycle and also facilitates several key events during germ cell development. The majority of CDK2's known meiotic functions occur during prophase of the first meiotic division. Here, CDK2 is involved in the regulation of meiotic transcription, the pairing of homologous chromosomes, and the maturation of meiotic crossover sites. Despite that some of the CDK2 substrates are known, few of them display functions in meiosis. Here, we investigate potential meiotic CDK2 substrates using in silico and in vitro approaches. We find that CDK2 phosphorylates PMS2 at Thr337, PMS1 at Thr331, and MLH1 in vitro. Phosphorylation of PMS2 affects its interaction with MLH1 to some degree. In testis extracts from mice lacking Cdk2, there are changes in expression of PMS2, MSH2, and HEI10, which may be reflective of the loss of CDK2 phosphorylation. Our work has uncovered a few CDK2 substrates with meiotic functions, which will have to be verified in vivo. A better understanding of the CDK2 substrates will help us to gain deeper insight into the functions of this universal kinase.
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Affiliation(s)
- Nathan Palmer
- Institute of Molecular and Cell Biology (IMCB), A*STAR (Agency for Science, Technology and Research), Singapore, Republic of Singapore
- Department of Chromosome Biology, Max Perutz Labs, University of Vienna, Vienna Biocenter, Vienna, Austria
| | - S Zakiah A Talib
- Institute of Molecular and Cell Biology (IMCB), A*STAR (Agency for Science, Technology and Research), Singapore, Republic of Singapore
- Department Biologie II, Biozentrum der LMU München, Zell- und Entwicklungsbiologie, Planegg-Martinsried, Germany
| | - Christine M F Goh
- Institute of Molecular and Cell Biology (IMCB), A*STAR (Agency for Science, Technology and Research), Singapore, Republic of Singapore
| | - Kajal Biswas
- Mouse Cancer Genetics Program, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick, MD, United States of America
| | - Shyam K Sharan
- Mouse Cancer Genetics Program, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick, MD, United States of America
| | - Philipp Kaldis
- Institute of Molecular and Cell Biology (IMCB), A*STAR (Agency for Science, Technology and Research), Singapore, Republic of Singapore
- Department of Clinical Sciences, Clinical Research Centre (CRC), Lund University, Malmö, Sweden
- Lund University Diabetes Centre, Lund University, Clinical Research Centre (CRC), Malmö, Sweden
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8
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Hussain M, Saifi S, Mohammed A, Sengupta S. Protocol to detect in vitro and in cell ubiquitylation of mitochondrial DNA polymerase gamma by mitochondrial E3 ligase MITOL. STAR Protoc 2022; 3:101710. [PMID: 36136752 PMCID: PMC9508469 DOI: 10.1016/j.xpro.2022.101710] [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: 05/16/2022] [Revised: 07/07/2022] [Accepted: 08/24/2022] [Indexed: 01/26/2023] Open
Abstract
Mitochondrial polymerase gamma (PolγA) is the only replicative polymerase in mitochondria. To determine PolγA ubiquitylation in cells, Flag-PolγA and MITOL are overexpressed, and subsequently the immunoprecipitated Flag-PolγA is checked for ubiquitylation. Alternately, in vitro synthesized PolγA and MITOL are used to determine whether PolγA is ubiquitylated. Either anti-ubiquitin or anti-Flag antibody is used to detect the ubiquitylated product. Thus, we provide a detailed, reliable, highly reproducible protocol for detecting ubiquitylation of PolγA by MITOL, both in cells and in vitro. For complete details on the use and execution of this protocol, please refer to Hussain et al. (2021).
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Affiliation(s)
- Mansoor Hussain
- National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi, India
| | - Shabnam Saifi
- National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi, India
| | - Aftab Mohammed
- National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi, India
| | - Sagar Sengupta
- National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi, India,Corresponding author
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9
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Lan H, Sun Y. Tumor Suppressor FBXW7 and Its Regulation of DNA Damage Response and Repair. Front Cell Dev Biol 2021; 9:751574. [PMID: 34760892 PMCID: PMC8573206 DOI: 10.3389/fcell.2021.751574] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2021] [Accepted: 10/05/2021] [Indexed: 12/21/2022] Open
Abstract
The proper DNA damage response (DDR) and repair are the central molecular mechanisms for the maintenance of cellular homeostasis and genomic integrity. The abnormality in this process is frequently observed in human cancers, and is an important contributing factor to cancer development. FBXW7 is an F-box protein serving as the substrate recognition component of SCF (SKP1-CUL1-F-box protein) E3 ubiquitin ligase. By selectively targeting many oncoproteins for proteasome-mediated degradation, FBXW7 acts as a typical tumor suppressor. Recent studies have demonstrated that FBXW7 also plays critical roles in the process of DDR and repair. In this review, we first briefly introduce the processes of protein ubiquitylation by SCFFBXW7 and DDR/repair, then provide an overview of the molecular characteristics of FBXW7. We next discuss how FBXW7 regulates the process of DDR and repair, and its translational implication. Finally, we propose few future perspectives to further elucidate the role of FBXW7 in regulation of a variety of biological processes and tumorigenesis, and to design a number of approaches for FBXW7 reactivation in a subset of human cancers for potential anticancer therapy.
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Affiliation(s)
- Huiyin Lan
- Department of Thoracic Radiation Oncology, Zhejiang Cancer Hospital, Cancer Hospital of University of Chinese Academy of Sciences, Hangzhou, China.,Institute of Cancer and Basic Medicine, Chinese Academy of Sciences, Hangzhou, China
| | - Yi Sun
- Cancer Institute of the Second Affiliated Hospital, Institute of Translational Medicine, Zhejiang University School of Medicine, Hangzhou, China.,Cancer Center, Zhejiang University, Hangzhou, China
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10
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Priya S, Kaur E, Kulshrestha S, Pandit A, Gross I, Kumar N, Agarwal H, Khan A, Shyam R, Bhagat P, Prabhu JS, Nagarajan P, Deo SVS, Bajaj A, Freund JN, Mukhopadhyay A, Sengupta S. CDX2 inducible microRNAs sustain colon cancer by targeting multiple DNA damage response pathway factors. J Cell Sci 2021; 134:jcs258601. [PMID: 34369561 DOI: 10.1242/jcs.258601] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Accepted: 07/05/2021] [Indexed: 12/15/2022] Open
Abstract
Meta-analysis of transcripts in colon adenocarcinoma patient tissues led to the identification of a DNA damage responsive miR signature called DNA damage sensitive miRs (DDSMs). DDSMs were experimentally validated in the cancerous colon tissues obtained from an independent cohort of colon cancer patients and in multiple cellular systems with high levels of endogenous DNA damage. All the tested DDSMs were transcriptionally upregulated by a common intestine-specific transcription factor, CDX2. Reciprocally, DDSMs were repressed via the recruitment of HDAC1/2-containing complexes onto the CDX2 promoter. These miRs downregulated multiple key targets in the DNA damage response (DDR) pathway, namely BRCA1, ATM, Chk1 (also known as CHEK1) and RNF8. CDX2 directly regulated the DDSMs, which led to increased tumor volume and metastasis in multiple preclinical models. In colon cancer patient tissues, the DDSMs negatively correlated with BRCA1 levels, were associated with decreased probability of survival and thereby could be used as a prognostic biomarker. This article has an associated First Person interview with the first author of the paper.
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Affiliation(s)
- Swati Priya
- Signal Transduction Laboratory, National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - Ekjot Kaur
- Signal Transduction Laboratory, National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - Swati Kulshrestha
- Signal Transduction Laboratory, National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - Awadhesh Pandit
- Signal Transduction Laboratory, National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - Isabelle Gross
- Université de Strasbourg, Inserm, IRFAC UMR_S1113, FMTS, 67200 Strasbourg, France
| | - Nitin Kumar
- Signal Transduction Laboratory, National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - Himanshi Agarwal
- Signal Transduction Laboratory, National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - Aamir Khan
- Signal Transduction Laboratory, National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - Radhey Shyam
- Signal Transduction Laboratory, National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - Prakash Bhagat
- Department of Surgical Oncology, All India Institute of Medical Sciences, New Delhi 110029, India
| | - Jyothi S Prabhu
- Division of Molecular Medicine, St. John's Research Institute, Bengaluru, Karnataka 560034, India
| | - Perumal Nagarajan
- Signal Transduction Laboratory, National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - S V S Deo
- Department of Surgical Oncology, All India Institute of Medical Sciences, New Delhi 110029, India
| | - Avinash Bajaj
- Laboratory of Nanotechnology and Chemical Biology, Regional Centre for Biotechnology, NCR Biotech Science Cluster, Faridabad, Haryana 121001, India
| | - Jean-Noël Freund
- Université de Strasbourg, Inserm, IRFAC UMR_S1113, FMTS, 67200 Strasbourg, France
| | - Arnab Mukhopadhyay
- Signal Transduction Laboratory, National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - Sagar Sengupta
- Signal Transduction Laboratory, National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi 110067, India
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11
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Kaur E, Agrawal R, Sengupta S. Functions of BLM Helicase in Cells: Is It Acting Like a Double-Edged Sword? Front Genet 2021; 12:634789. [PMID: 33777104 PMCID: PMC7994599 DOI: 10.3389/fgene.2021.634789] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2020] [Accepted: 02/11/2021] [Indexed: 12/14/2022] Open
Abstract
DNA damage repair response is an important biological process involved in maintaining the fidelity of the genome in eukaryotes and prokaryotes. Several proteins that play a key role in this process have been identified. Alterations in these key proteins have been linked to different diseases including cancer. BLM is a 3′−5′ ATP-dependent RecQ DNA helicase that is one of the most essential genome stabilizers involved in the regulation of DNA replication, recombination, and both homologous and non-homologous pathways of double-strand break repair. BLM structure and functions are known to be conserved across many species like yeast, Drosophila, mouse, and human. Genetic mutations in the BLM gene cause a rare, autosomal recessive disorder, Bloom syndrome (BS). BS is a monogenic disease characterized by genomic instability, premature aging, predisposition to cancer, immunodeficiency, and pulmonary diseases. Hence, these characteristics point toward BLM being a tumor suppressor. However, in addition to mutations, BLM gene undergoes various types of alterations including increase in the copy number, transcript, and protein levels in multiple types of cancers. These results, along with the fact that the lack of wild-type BLM in these cancers has been associated with increased sensitivity to chemotherapeutic drugs, indicate that BLM also has a pro-oncogenic function. While a plethora of studies have reported the effect of BLM gene mutations in various model organisms, there is a dearth in the studies undertaken to investigate the effect of its oncogenic alterations. We propose to rationalize and integrate the dual functions of BLM both as a tumor suppressor and maybe as a proto-oncogene, and enlist the plausible mechanisms of its deregulation in cancers.
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Affiliation(s)
- Ekjot Kaur
- Signal Transduction Laboratory-2, National Institute of Immunology, New Delhi, India
| | - Ritu Agrawal
- Signal Transduction Laboratory-2, National Institute of Immunology, New Delhi, India
| | - Sagar Sengupta
- Signal Transduction Laboratory-2, National Institute of Immunology, New Delhi, India
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12
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Yumimoto K, Nakayama KI. Recent insight into the role of FBXW7 as a tumor suppressor. Semin Cancer Biol 2020; 67:1-15. [PMID: 32113998 DOI: 10.1016/j.semcancer.2020.02.017] [Citation(s) in RCA: 68] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Revised: 02/15/2020] [Accepted: 02/26/2020] [Indexed: 12/12/2022]
Abstract
FBXW7 (also known as Fbw7, Sel10, hCDC4, or hAgo) is a tumor suppressor and the most frequently mutated member of the F-box protein family in human cancers. FBXW7 functions as the substrate recognition component of an SCF-type E3 ubiquitin ligase. It specifically controls the proteasome-mediated degradation of many oncoproteins such as c-MYC, NOTCH, KLF5, cyclin E, c-JUN, and MCL1. In this review, we summarize the molecular and biological features of FBXW7 and its substrates as well as the impact of mutations of FBXW7 on cancer development. We also address the clinical potential of anticancer therapy targeting FBXW7.
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Affiliation(s)
- Kanae Yumimoto
- Department of Molecular and Cellular Biology, Medical Institute of Bioregulation, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, Fukuoka, 812-8582, Japan
| | - Keiichi I Nakayama
- Department of Molecular and Cellular Biology, Medical Institute of Bioregulation, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, Fukuoka, 812-8582, Japan.
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13
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Tripathi V, Kaur E, Kharat SS, Hussain M, Damodaran AP, Kulshrestha S, Sengupta S. Abrogation of FBW7α-dependent p53 degradation enhances p53's function as a tumor suppressor. J Biol Chem 2019; 294:13224-13232. [PMID: 31346036 DOI: 10.1074/jbc.ac119.008483] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Revised: 07/15/2019] [Indexed: 12/12/2022] Open
Abstract
The gene encoding the tumor suppressor p53 is mutated in most cancers. p53 expression is known to be tightly controlled by several E3 ligases. Here, we show that F-box and WD repeat domain-containing 7α (FBW7α), the substrate-recognition component of the SCFFBW7 multiprotein E3 ligase complex, targets both WT and tumor-derived mutants of p53 for proteasomal degradation in multiple human cancer cell lines (HCT116 and U2OS). We found that lack of FBW7α stabilizes p53 levels, thereby increasing its half-life. p53 ubiquitylation and subsequent degradation require the F-box and the C-terminal WD40 repeats in FBW7α. The polyubiquitylation of p53 occurred via Lys-48 linkage and involved phosphorylation on p53 at Ser-33 and Ser-37 by glycogen synthase kinase 3β (GSK3β) and DNA-dependent protein kinase (DNA-PK), respectively. These phosphorylation events created a phosphodegron that enhanced p53 binding to FBW7α, allowing for the attachment of polyubiquitin moieties at Lys-132 in p53. FBW7α-dependent p53 polyubiquitylation apparently occurred during and immediately after DNA double-strand breaks induced by either doxorubicin or ionizing radiation. Accordingly, in cells lacking FBW7α, p53 induction was enhanced after DNA damage. Phosphodegron-mediated polyubiquitylation of p53 on Lys-132 had functional consequences, with cells in which FBW7α-mediated p53 degradation was abrogated exhibiting enhancement of their tumorigenic potential. We conclude that p53, which previously has been reported to transactivate FBW7, is also targeted by the same E3 ligase for degradation, suggesting the presence of a regulatory feedback loop that controls p53 levels and functions during DNA damage.
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Affiliation(s)
- Vivek Tripathi
- National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - Ekjot Kaur
- National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - Suhas Sampat Kharat
- National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - Mansoor Hussain
- National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi 110067, India
| | | | - Swati Kulshrestha
- National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - Sagar Sengupta
- National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi 110067, India.
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14
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Priyadarshini R, Hussain M, Attri P, Kaur E, Tripathi V, Priya S, Dhapola P, Saha D, Madhavan V, Chowdhury S, Sengupta S. BLM Potentiates c-Jun Degradation and Alters Its Function as an Oncogenic Transcription Factor. Cell Rep 2018; 24:947-961.e7. [DOI: 10.1016/j.celrep.2018.06.101] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Revised: 05/07/2018] [Accepted: 06/25/2018] [Indexed: 12/16/2022] Open
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15
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Tripathi V, Agarwal H, Priya S, Batra H, Modi P, Pandey M, Saha D, Raghavan SC, Sengupta S. MRN complex-dependent recruitment of ubiquitylated BLM helicase to DSBs negatively regulates DNA repair pathways. Nat Commun 2018. [PMID: 29523790 PMCID: PMC5844875 DOI: 10.1038/s41467-018-03393-8] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Mutations in BLM in Bloom Syndrome patients predispose them to multiple types of cancers. Here we report that BLM is recruited in a biphasic manner to annotated DSBs. BLM recruitment is dependent on the presence of NBS1, MRE11 and ATM. While ATM activity is essential for BLM recruitment in early phase, it is dispensable in late phase when MRE11 exonuclease activity and RNF8-mediated ubiquitylation of BLM are the key determinants. Interaction between polyubiquitylated BLM and NBS1 is essential for the helicase to be retained at the DSBs. The helicase activity of BLM is required for the recruitment of HR and c-NHEJ factors onto the chromatin in S- and G1-phase, respectively. During the repair phase, BLM inhibits HR in S-phase and c-NHEJ in G1-phase. Consequently, inhibition of helicase activity of BLM enhances the rate of DNA alterations. Thus BLM utilizes its pro- and anti-repair functions to maintain genome stability. Bloom helicase is recruited to double strand breaks in an ATM dependent manner. Here the authors show that Bloom helicase is recruited to double strand breaks in an ATM and MRN dependent manner with HR and NHEJ regulated by the helicase depending on the phase of the cell cycle.
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Affiliation(s)
- Vivek Tripathi
- National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi, 110067, India
| | - Himanshi Agarwal
- National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi, 110067, India
| | - Swati Priya
- National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi, 110067, India
| | - Harish Batra
- National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi, 110067, India
| | - Priyanka Modi
- National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi, 110067, India
| | - Monica Pandey
- Department of Biochemistry, Indian Institute of Science, Bangalore, 560012, India
| | - Dhurjhoti Saha
- Institute of Genomics and Integrative Biology, CSIR, Mathura Road, New Delhi, 110025, India
| | - Sathees C Raghavan
- Department of Biochemistry, Indian Institute of Science, Bangalore, 560012, India
| | - Sagar Sengupta
- National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi, 110067, India.
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16
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Wang J, Jo U, Joo SY, Kim H. FBW7 regulates DNA interstrand cross-link repair by modulating FAAP20 degradation. Oncotarget 2018; 7:35724-35740. [PMID: 27232758 PMCID: PMC5094957 DOI: 10.18632/oncotarget.9595] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2016] [Accepted: 05/16/2016] [Indexed: 12/13/2022] Open
Abstract
Mutations that deregulate protein degradation lead to human malignancies. The SCF ubiquitin E3 ligase complex degrades key oncogenic regulators, thereby limiting their oncogenic potential. FBW7 is a substrate recognition subunit of SCFFBW7 and is among the most commonly mutated ubiquitin-proteasome system proteins in cancer. FBW7-mutated cancer cells display increased genome instability, but the molecular mechanism by which FBW7 preserves genome integrity remains elusive. Here, we demonstrate that SCFFBW7 regulates the stability of FAAP20, a critical component of the Fanconi anemia (FA) DNA interstrand cross-link (ICL) repair pathway. Phosphorylation of the FAAP20 degron motif by GSK3β provides a platform for recognition and polyubiquitination of FAAP20 by FBW7, and its subsequent degradation by the proteasome. Accordingly, enhanced GSK3β-FBW7 signaling disrupts the FA pathway. In cells expressing non-phosphorylatable FAAP20 mutant, the turnover of its binding partner, FANCA, is deregulated in the chromatin during DNA ICL repair, and the FA pathway is compromised. We propose that FAAP20 degradation, which is prompted by its phosphorylation, controls the dynamics of the FA core complex required for completing DNA ICL repair. Together, this study provides insights into how FBW7-mediated proteolysis regulates genome stability and how its deregulation is associated with tumorigenesis.
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Affiliation(s)
- Jingming Wang
- Department of Pharmacological Sciences, Stony Brook University, Stony Brook, New York, USA
| | - Ukhyun Jo
- Department of Pharmacological Sciences, Stony Brook University, Stony Brook, New York, USA
| | - So Young Joo
- Department of Pharmacological Sciences, Stony Brook University, Stony Brook, New York, USA
| | - Hyungjin Kim
- Department of Pharmacological Sciences, Stony Brook University, Stony Brook, New York, USA
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17
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Brosh RM, Matson SW. Replication checkpoint-mediated symmetric DNA synthesis: beginning to understand mechanism. Cell Cycle 2017; 17:271-272. [PMID: 29169274 DOI: 10.1080/15384101.2017.1408234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
Affiliation(s)
- Robert M Brosh
- a Laboratory of Molecular Gerontology , National Institute on Aging , NIH , Baltimore , Maryland
| | - Steven W Matson
- b Department of Biology , Curriculum in Genetics and Molecular Biology , University of North Carolina at Chapel Hill , Chapel Hill , North Carolina
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18
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Kudo I, Nozawa M, Miki K, Takauji Y, En A, Fujii M, Ayusawa D. Dual roles of ERK1/2 in cellular senescence induced by excess thymidine in HeLa cells. Exp Cell Res 2016; 346:216-23. [PMID: 27443255 DOI: 10.1016/j.yexcr.2016.07.018] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2016] [Revised: 07/11/2016] [Accepted: 07/17/2016] [Indexed: 12/23/2022]
Abstract
DNA damage response is crucially involved in cellular senescence. We have previously shown that excess thymidine, which stalls DNA replication forks, induces cellular senescence in human cells, and ERK1/2 play a key role in the induction of it. In this study, we found that Chk1 and ERK1/2 were activated to promote cell survival upon addition of excess thymidine. Knockdown of ERK1/2 activated Chk1, and conversely, knockdown of Chk1 activated ERK1/2, which observations suggested a mechanism for compensatory activation of Chk1 and ERK1/2 in the absence of ERK1/2 and Chk1, respectively. We also found that Chk1 functioned mainly at the onset of cellular senescence, and on the other hand, ERK1/2 functioned for a more extended period to induce cellular senescence. Our findings suggested that Chk1 and ERK1/2 were activated to promote cell survival upon addition of excess thymidine, but prolonged activation of ERK1/2 led to cellular senescence. This implies a pleiotropic effect of ERK1/2 in cellular senescence induced by excess thymidine.
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Affiliation(s)
- Ikuru Kudo
- Graduate school of Nanobioscience, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama, Kanagawa 236-0027, Japan
| | - Megumi Nozawa
- Graduate school of Nanobioscience, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama, Kanagawa 236-0027, Japan
| | - Kensuke Miki
- Graduate school of Nanobioscience, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama, Kanagawa 236-0027, Japan; Ichiban Life Corporation, 1-1-7 Horai-cho, Naka-ku, Yokohama, Kanagawa 231-0048, Japan
| | - Yuki Takauji
- Graduate school of Nanobioscience, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama, Kanagawa 236-0027, Japan
| | - Atsuki En
- Graduate school of Nanobioscience, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama, Kanagawa 236-0027, Japan
| | - Michihiko Fujii
- Graduate school of Nanobioscience, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama, Kanagawa 236-0027, Japan.
| | - Dai Ayusawa
- Graduate school of Nanobioscience, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama, Kanagawa 236-0027, Japan; Ichiban Life Corporation, 1-1-7 Horai-cho, Naka-ku, Yokohama, Kanagawa 231-0048, Japan
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19
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Kumari J, Hussain M, De S, Chandra S, Modi P, Tikoo S, Singh A, Sagar C, Sepuri NBV, Sengupta S. Mitochondrial functions of RECQL4 are required for the prevention of aerobic glycolysis-dependent cell invasion. J Cell Sci 2016; 129:1312-8. [PMID: 26906415 DOI: 10.1242/jcs.181297] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Accepted: 02/15/2016] [Indexed: 01/08/2023] Open
Abstract
Germline mutations in RECQL4 helicase are associated with Rothmund-Thomson syndrome, which is characterized by a predisposition to cancer. RECQL4 localizes to the mitochondria, where it acts as an accessory factor during mitochondrial DNA replication. To understand the specific mitochondrial functions of RECQL4, we created isogenic cell lines, in which the mitochondrial localization of the helicase was either retained or abolished. The mitochondrial integrity was affected due to the absence of RECQL4 in mitochondria, leading to a decrease in F1F0-ATP synthase activity. In cells where RECQL4 does not localize to mitochondria, the membrane potential was decreased, whereas ROS levels increased due to the presence of high levels of catalytically inactive SOD2. Inactive SOD2 accumulated owing to diminished SIRT3 activity. Lack of the mitochondrial functions of RECQL4 led to aerobic glycolysis that, in turn, led to an increased invasive capability within these cells. Together, this study demonstrates for the first time that, owing to its mitochondrial functions, the accessory mitochondrial replication helicase RECQL4 prevents the invasive step in the neoplastic transformation process.
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Affiliation(s)
- Jyoti Kumari
- National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - Mansoor Hussain
- National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - Siddharth De
- National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - Suruchika Chandra
- National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - Priyanka Modi
- National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - Shweta Tikoo
- National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - Archana Singh
- Council for Scientific and Industrial Research - Institute of Genomics and Integrative Biology, Delhi 110007, India
| | - Chandrasekhar Sagar
- Department of Neuropathology, National Institute of Mental Health & Neurosciences, Bangalore 560029, India
| | - Naresh Babu V Sepuri
- Department of Biochemistry, University of Hyderabad, Gachibowli, Hyderabad 500046, India
| | - Sagar Sengupta
- National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi 110067, India
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