1
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Sun H, Cai H, Xu C, Zhai H, Lux F, Xie Y, Feng L, Du L, Liu Y, Sun X, Wang Q, Song H, He N, Zhang M, Ji K, Wang J, Gu Y, Leduc G, Doussineau T, Wang Y, Liu Q, Tillement O. AGuIX nanoparticles enhance ionizing radiation-induced ferroptosis on tumor cells by targeting the NRF2-GPX4 signaling pathway. J Nanobiotechnology 2022; 20:449. [PMID: 36242003 PMCID: PMC9569109 DOI: 10.1186/s12951-022-01654-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Accepted: 09/25/2022] [Indexed: 11/10/2022] Open
Abstract
In the frame of radiotherapy treatment of cancer, radioresistance remains a major issue that still needs solutions to be overcome. To effectively improve the radiosensitivity of tumors and reduce the damage of radiation to neighboring normal tissues, radiosensitizers have been given increasing attention in recent years. As nanoparticles based on the metal element gadolinium, AGuIX nanoparticles have been shown to increase the radiosensitivity of cancers. Although it is a rare nanomaterial that has entered preclinical trials, the unclear biological mechanism hinders its further clinical application. In this study, we demonstrated the effectiveness of AGuIX nanoparticles in the radiosensitization of triple-negative breast cancer. We found that AGuIX nanoparticles increased the level of DNA damage by compromising the homologous recombination repair pathway instead of the non-homologous end joining pathway. Moreover, the results showed that AGuIX nanoparticles induced apoptosis, but the degree of apoptosis ability was very low, which cannot fully explain their strong radiosensitizing effect. Ferroptosis, the other mode of cell death, was also discovered to play a significant role in radiation sensitization, and AGuIX nanoparticles may regulate the anti-ferroptosis system by inhibiting the NRF2-GSH-GPX4 signaling pathway.
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Affiliation(s)
- Hao Sun
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China
| | - Hui Cai
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China
| | - Chang Xu
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China
| | - Hezheng Zhai
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China.,School of Precision Instruments and OPTO-Electronics Engineering, Tianjin University, Tianjin, 300072, China
| | - François Lux
- Institute Light and Mater, UMR5306, Lyon1 University-CNRS, Lyon University, 69100, Villeurbanne, France.,Institut Universitaire de France (IUF), 75231, Paris, France
| | - Yi Xie
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China
| | - Li Feng
- Department of Medical Ultrasound, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Abdominal Medical Imaging, Jinan, 250014, China
| | - Liqing Du
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China
| | - Yang Liu
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China
| | - Xiaohui Sun
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China
| | - Qin Wang
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China
| | - Huijuan Song
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China
| | - Ningning He
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China
| | - Manman Zhang
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China
| | - Kaihua Ji
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China
| | - Jinhan Wang
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China
| | - Yeqing Gu
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China
| | - Géraldine Leduc
- NH TherAguix S.A.S, 29 chemin du Vieux Chêne, 38240, Meylan, France
| | | | - Yan Wang
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China.
| | - Qiang Liu
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China.
| | - Olivier Tillement
- Institute Light and Mater, UMR5306, Lyon1 University-CNRS, Lyon University, 69100, Villeurbanne, France
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2
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Wilsker DF, Barrett AM, Dull AB, Lawrence SM, Hollingshead MG, Chen A, Kummar S, Parchment RE, Doroshow JH, Kinders RJ. Evaluation of Pharmacodynamic Responses to Cancer Therapeutic Agents Using DNA Damage Markers. Clin Cancer Res 2019; 25:3084-3095. [PMID: 30792217 PMCID: PMC6522288 DOI: 10.1158/1078-0432.ccr-18-2523] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Revised: 12/12/2018] [Accepted: 02/14/2019] [Indexed: 12/21/2022]
Abstract
PURPOSE We sought to examine the pharmacodynamic activation of the DNA damage response (DDR) pathway in tumors following anticancer treatment for confirmation of target engagement. EXPERIMENTAL DESIGN We evaluated the time course and spatial activation of 3 protein biomarkers of DNA damage recognition and repair (γH2AX, pS343-Nbs1, and Rad51) simultaneously in a quantitative multiplex immunofluorescence assay (IFA) to assess DDR pathway activation in tumor tissues following exposure to DNA-damaging agents. RESULTS Because of inherent biological variability, baseline DDR biomarker levels were evaluated in a colorectal cancer microarray to establish clinically relevant thresholds for pharmacodynamic activation. Xenograft-bearing mice and clinical colorectal tumor biopsies obtained from subjects exposed to DNA-damaging therapeutic regimens demonstrated marked intratumor heterogeneity in the timing and extent of DDR biomarker activation due, in part, to the cell-cycle dependency of DNA damage biomarker expression. CONCLUSIONS We have demonstrated the clinical utility of this DDR multiplex IFA in preclinical models and clinical specimens following exposure to multiple classes of cytotoxic agents, DNA repair protein inhibitors, and molecularly targeted agents, in both homologous recombination-proficient and -deficient contexts. Levels exceeding 4% nuclear area positive (NAP) γH2AX, 4% NAP pS343-Nbs1, and 5% cells with ≥5 Rad51 nuclear foci indicate a DDR activation response to treatment in human colorectal cancer tissue. Determination of effect-level cutoffs allows for robust interpretation of biomarkers with significant interpatient and intratumor heterogeneity; simultaneous assessment of biomarkers induced at different phases of the DDR guards against the risk of false negatives due to an ill-timed biopsy.
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Affiliation(s)
- Deborah F Wilsker
- Clinical Pharmacodynamic Biomarkers Program, Applied/Developmental Research Directorate, Leidos Biomedical Research, Inc., Frederick National Laboratory for Cancer Research, Frederick, Maryland.
| | - Allison M Barrett
- Clinical Pharmacodynamic Biomarkers Program, Applied/Developmental Research Directorate, Leidos Biomedical Research, Inc., Frederick National Laboratory for Cancer Research, Frederick, Maryland
| | - Angie B Dull
- Clinical Pharmacodynamic Biomarkers Program, Applied/Developmental Research Directorate, Leidos Biomedical Research, Inc., Frederick National Laboratory for Cancer Research, Frederick, Maryland
| | - Scott M Lawrence
- Clinical Pharmacodynamic Biomarkers Program, Applied/Developmental Research Directorate, Leidos Biomedical Research, Inc., Frederick National Laboratory for Cancer Research, Frederick, Maryland
| | | | - Alice Chen
- Division of Cancer Treatment and Diagnosis, NCI, Bethesda, Maryland
| | - Shivaani Kummar
- Division of Cancer Treatment and Diagnosis, NCI, Bethesda, Maryland
| | - Ralph E Parchment
- Clinical Pharmacodynamic Biomarkers Program, Applied/Developmental Research Directorate, Leidos Biomedical Research, Inc., Frederick National Laboratory for Cancer Research, Frederick, Maryland
| | - James H Doroshow
- Division of Cancer Treatment and Diagnosis, NCI, Bethesda, Maryland
- Developmental Therapeutics Branch, Center for Cancer Research, NCI, Bethesda, Maryland
| | - Robert J Kinders
- Clinical Pharmacodynamic Biomarkers Program, Applied/Developmental Research Directorate, Leidos Biomedical Research, Inc., Frederick National Laboratory for Cancer Research, Frederick, Maryland.
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3
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Lamarche BJ, Orazio NI, Goben B, Meisenhelder J, You Z, Weitzman MD, Hunter T. Repair of protein-linked DNA double strand breaks: Using the adenovirus genome as a model substrate in cell-based assays. DNA Repair (Amst) 2018; 74:80-90. [PMID: 30583959 DOI: 10.1016/j.dnarep.2018.12.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Revised: 12/07/2018] [Accepted: 12/07/2018] [Indexed: 11/29/2022]
Abstract
The DNA double strand breaks (DSBs) created during meiotic recombination and during some types of chemotherapy contain protein covalently attached to their 5' termini. Removal of the end-blocking protein is a prerequisite to DSB processing by non-homologous end-joining or homologous recombination. One mechanism for removing the protein involves CtIP-stimulated Mre11-catalyzed nicking of the protein-linked strand distal to the DSB terminus, releasing the end-blocking protein while it remains covalently attached to an oligonucleotide. Much of what is known about this repair process has recently been deciphered through in vitro reconstitution studies. We present here a novel model system based on adenovirus (Ad), which contains the Ad terminal protein covalently linked to the 5' terminus of its dsDNA genome, for studying the repair of 5' protein-linked DSBs in vivo. It was previously shown that the genome of Ad mutants that lack early region 4 (E4) can be joined into concatemers in vivo, suggesting that the Ad terminal protein had been removed from the genome termini prior to ligation. Here we show that during infection with the E4-deleted Ad mutant dl1004, the Ad terminal protein is removed in a manner that recapitulates removal of end-blocking proteins from cellular DSBs. In addition to displaying a dependence on CtIP, and Mre11 acting as the endonuclease, the protein-linked oligonucleotides that are released from the viral genome are similar in size to the oligos that remain attached to Spo11 and Top2 after they are removed from the 5' termini of DSBs during meiotic recombination and etoposide chemotherapy, respectively. The single nucleotide resolution that is possible with this assay, combined with the single sequence context in which the lesion is presented, make it a useful tool for further refining our mechanistic understanding of how blocking proteins are removed from the 5' termini of DSBs.
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Affiliation(s)
- Brandon J Lamarche
- Laboratory of Genetics, Salk Institute for Biological Studies, La Jolla, California, 92037, USA; Molecular and Cell Biology Laboratory, Salk Institute for Biological Studies, La Jolla, California, 92037, USA
| | - Nicole I Orazio
- Laboratory of Genetics, Salk Institute for Biological Studies, La Jolla, California, 92037, USA
| | - Brittany Goben
- Molecular and Cell Biology Laboratory, Salk Institute for Biological Studies, La Jolla, California, 92037, USA
| | - Jill Meisenhelder
- Molecular and Cell Biology Laboratory, Salk Institute for Biological Studies, La Jolla, California, 92037, USA
| | - Zhongsheng You
- Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, Missouri, 63110, USA
| | - Matthew D Weitzman
- Laboratory of Genetics, Salk Institute for Biological Studies, La Jolla, California, 92037, USA.
| | - Tony Hunter
- Molecular and Cell Biology Laboratory, Salk Institute for Biological Studies, La Jolla, California, 92037, USA.
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4
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Sizemore ST, Zhang M, Cho JH, Sizemore GM, Hurwitz B, Kaur B, Lehman NL, Ostrowski MC, Robe PA, Miao W, Wang Y, Chakravarti A, Xia F. Pyruvate kinase M2 regulates homologous recombination-mediated DNA double-strand break repair. Cell Res 2018; 28:1090-1102. [PMID: 30297868 PMCID: PMC6218445 DOI: 10.1038/s41422-018-0086-7] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2018] [Revised: 07/23/2018] [Accepted: 08/16/2018] [Indexed: 02/08/2023] Open
Abstract
Resistance to genotoxic therapies is a primary cause of treatment failure and tumor recurrence. The underlying mechanisms that activate the DNA damage response (DDR) and allow cancer cells to escape the lethal effects of genotoxic therapies remain unclear. Here, we uncover an unexpected mechanism through which pyruvate kinase M2 (PKM2), the highly expressed PK isoform in cancer cells and a master regulator of cancer metabolic reprogramming, integrates with the DDR to directly promote DNA double-strand break (DSB) repair. In response to ionizing radiation and oxidative stress, ATM phosphorylates PKM2 at T328 resulting in its nuclear accumulation. pT328-PKM2 is required and sufficient to promote homologous recombination (HR)-mediated DNA DSB repair through phosphorylation of CtBP-interacting protein (CtIP) on T126 to increase CtIP's recruitment at DSBs and resection of DNA ends. Disruption of the ATM-PKM2-CtIP axis sensitizes cancer cells to a variety of DNA-damaging agents and PARP1 inhibition. Furthermore, increased nuclear pT328-PKM2 level is associated with significantly worse survival in glioblastoma patients. Combined, these data advocate the use of PKM2-targeting strategies as a means to not only disrupt cancer metabolism but also inhibit an important mechanism of resistance to genotoxic therapies.
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Affiliation(s)
- Steven T Sizemore
- Department of Radiation Oncology, Arthur G James Comprehensive Cancer Center and Richard L. Solove Research Institute, The Ohio State University Medical Center, Columbus, OH, 43210, USA
| | - Manchao Zhang
- Department of Radiation Oncology, University of Arkansas for Medical Sciences, Little Rock, AR, 72205, USA
| | - Ju Hwan Cho
- Department of Radiation Oncology, Arthur G James Comprehensive Cancer Center and Richard L. Solove Research Institute, The Ohio State University Medical Center, Columbus, OH, 43210, USA
| | - Gina M Sizemore
- Department of Cancer Biology & Genetics, Arthur G James Comprehensive Cancer Center and Richard L. Solove Research Institute, The Ohio State University Medical Center, Columbus, OH, 43210, USA
| | - Brian Hurwitz
- Department of Neurological Surgery, Arthur G James Comprehensive Cancer Center and Richard L. Solove Research Institute, The Ohio State University Medical Center, Columbus, OH, 43210, USA
| | - Balveen Kaur
- Department of Radiation Oncology, Arthur G James Comprehensive Cancer Center and Richard L. Solove Research Institute, The Ohio State University Medical Center, Columbus, OH, 43210, USA
- Department of Neurological Surgery, Arthur G James Comprehensive Cancer Center and Richard L. Solove Research Institute, The Ohio State University Medical Center, Columbus, OH, 43210, USA
| | - Norman L Lehman
- Department of Pathology, Arthur G James Comprehensive Cancer Center and Richard L. Solove Research Institute, The Ohio State University Medical Center, Columbus, OH, 43210, USA
| | - Michael C Ostrowski
- Department of Cancer Biology & Genetics, Arthur G James Comprehensive Cancer Center and Richard L. Solove Research Institute, The Ohio State University Medical Center, Columbus, OH, 43210, USA
| | - Pierre A Robe
- Department of Neurology and Neurosurgery, Rudolf Magnus Brain Institute, University Medical Center of Utrecht, Utrecht, The Netherlands
- Departments of Neurosurgery and Human Genetics, University of Liege, Liege, Belgium
| | - Weili Miao
- Department of Chemistry, University of California, Riverside, CA, 92521, USA
| | - Yinsheng Wang
- Department of Chemistry, University of California, Riverside, CA, 92521, USA
| | - Arnab Chakravarti
- Department of Radiation Oncology, Arthur G James Comprehensive Cancer Center and Richard L. Solove Research Institute, The Ohio State University Medical Center, Columbus, OH, 43210, USA
| | - Fen Xia
- Department of Radiation Oncology, University of Arkansas for Medical Sciences, Little Rock, AR, 72205, USA.
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5
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Zhang H, Wang F, Mao C, Zhang Z, Fu S, Lu J, Zhai Z, Li R, Li S, Rodriguez R, Wang Z. Effect of combined treatment of radiation and tissue-specific recombinant oncolytic adenovirus on bladder cancer cells. Int J Radiat Biol 2016; 93:174-183. [PMID: 27600610 DOI: 10.1080/09553002.2017.1231942] [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] [Indexed: 01/05/2023]
Abstract
PURPOSE Gene therapy combined with radiation has shown promising potential for the treatment of tumors. This paper aimed to clarify the synergistic effect of radiotherapy combined with the bladder cancer tissue-specific oncolytic adenovirus (Ad-PSCAE-UPII-E1A) on bladder cancer cells and to study the underlying synergy mechanisms of the combined treatment. MATERIALS AND METHODS The Adenovirus carrying E1A under control of UPII promoter and prostate stem cell antigen enhancer (PSCAE) were successfully constructed. The viability of bladder cancer cells BIU-87 and EJ was determined by MTT assay. The apoptotic assay was demonstrated by flow cytometry and TEM. Virus titer was determined by TCID50 assay, and proteins Mre11, Chk2-Thr68, and E1A were analyzed by Western blot method. RESULTS Oncolytic adenovirus combined with radiotherapy improved antitumor efficacy compared with the single treatment at a time and was X-ray dosage-dependent. When the adenovirus infection was scheduled at 24 h after irradiation, cancer cells had the lowest viability. Adenovirus and irradiation induced cell death through the caspase-3 related apoptotic pathway, and bladder cancer cells were arrested at the G1 (BIU-87) or S phase (EJ). Autophagic vacuoles were observed in bladder cancer cells treated with radiation and adenovirus. After irradiation, more virus particles were observed in the BIU-87 and EJ cells. However, by a TCID50 assay, there was no difference in virus titter between irradiated bladder cancer cells and unirradiated cells. The proteins Mre11, Chk2-Thr68 which involved in the DNA break repair pathway were decreased while γ-H2AX-Ser139 increased; at the same time, the E1A gene and the hexon proteins of oncolytic adenovirus were increased after irradiation. CONCLUSIONS Our results proved synergistic antitumor effect of adenovirus Ad-PSCAE-UPII-E1A and radiation, which might be a potential therapeutic strategy for bladder cancer.
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Affiliation(s)
- Hongjuan Zhang
- a Urologic Clinical Center of Gansu Province, Key Laboratory of Gansu Province, Institute of Urology, The Second Hospital of Lanzhou University , Lanzhou , China.,b The Second Hospital of Tianjin Medical University , Tian Jin , China
| | - Fang Wang
- c School of Basic Medical Sciences, Lanzhou University , Lanzhou , China
| | - Chunjie Mao
- d The General Hospital of Tianjin Medical University , Tian Jin , China
| | - Zuncheng Zhang
- b The Second Hospital of Tianjin Medical University , Tian Jin , China
| | - Shengjun Fu
- a Urologic Clinical Center of Gansu Province, Key Laboratory of Gansu Province, Institute of Urology, The Second Hospital of Lanzhou University , Lanzhou , China
| | - Jianzhong Lu
- a Urologic Clinical Center of Gansu Province, Key Laboratory of Gansu Province, Institute of Urology, The Second Hospital of Lanzhou University , Lanzhou , China
| | - Zhenxing Zhai
- a Urologic Clinical Center of Gansu Province, Key Laboratory of Gansu Province, Institute of Urology, The Second Hospital of Lanzhou University , Lanzhou , China
| | - Renju Li
- a Urologic Clinical Center of Gansu Province, Key Laboratory of Gansu Province, Institute of Urology, The Second Hospital of Lanzhou University , Lanzhou , China
| | - Shuwen Li
- a Urologic Clinical Center of Gansu Province, Key Laboratory of Gansu Province, Institute of Urology, The Second Hospital of Lanzhou University , Lanzhou , China
| | - Ron Rodriguez
- e Department of Urology , University of Texas Health Science Center , San Antonio , Texas , USA
| | - Zhiping Wang
- a Urologic Clinical Center of Gansu Province, Key Laboratory of Gansu Province, Institute of Urology, The Second Hospital of Lanzhou University , Lanzhou , China
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6
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Xu Z, Wang F, Fan F, Gu Y, Shan N, Meng X, Cheng S, Liu Y, Wang C, Song Y, Xu R. Quantitative Proteomics Reveals That the Inhibition of Na+/K+-ATPase Activity Affects S-Phase Progression Leading to a Chromosome Segregation Disorder by Attenuating the Aurora A Function in Hepatocellular Carcinoma Cells. J Proteome Res 2015; 14:4594-602. [PMID: 26491887 DOI: 10.1021/acs.jproteome.5b00724] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Zhongwei Xu
- Central
Laboratory, Logistics University of Chinese People’s Armed Police Force, Tianjin 300162, China
| | - Fengmei Wang
- Department
of Gastroenterology and Hepatology, The Third Central Hospital of Tianjin, Tianjin 300170, China
| | - Fengxu Fan
- Central
Laboratory, Logistics University of Chinese People’s Armed Police Force, Tianjin 300162, China
| | - Yanjun Gu
- Affiliated Hospital of Chinese People’s Armed Police Force, Tianjin 300162, China
| | - Nana Shan
- Central
Laboratory, Logistics University of Chinese People’s Armed Police Force, Tianjin 300162, China
| | - Xiangyan Meng
- Department
of Physiology and Pathophysiology, Logistics University of Chinese People’s Armed Police Force, Tianjin 300162, China
| | - Shixiang Cheng
- Affiliated Hospital of Chinese People’s Armed Police Force, Tianjin 300162, China
| | - Yingfu Liu
- Central
Laboratory, Logistics University of Chinese People’s Armed Police Force, Tianjin 300162, China
| | - Chengyan Wang
- Central
Laboratory, Logistics University of Chinese People’s Armed Police Force, Tianjin 300162, China
| | - Yueying Song
- Central
Laboratory, Logistics University of Chinese People’s Armed Police Force, Tianjin 300162, China
| | - Ruicheng Xu
- Tianjin Key Laboratory for Biomarkers of Occupational and Environmental Hazard, No. 1 Huizhi Huan Road, DongLi District, Tianjin 300309, China
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7
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Narukawa-Nara M, Sasaki K, Ishii A, Baba K, Amano K, Kuroki M, Saitoh KI, Kamakura T. Identification and characterization of a novel gene encoding the NBS1 protein in Pyricularia oryzae. Biosci Biotechnol Biochem 2015; 79:1183-90. [PMID: 25774746 DOI: 10.1080/09168451.2015.1015951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
The ascomycete Pyricularia oryzae (teleomorph: Magnaporthe oryzae) causes one of the most serious diseases known as rice blast. The Nijmegen breakage syndrome protein (NBS1) is essential for DNA repair; thus, we studied the P. oryzae NBS1 homolog (PoNBS1). A PoNBS1 null mutant exhibited high sensitivity to DNA damage-inducing agents. The mutant also exhibited the retarded hyphal growth, and induced abnormal conidial germination and shape, but showed normal appressorium formation. The phenotypes of the null mutant were complemented by introducing the cDNA of PoNBS1 driven by a TrpC promoter of Aspergillus nidulans. In addition, the null mutant similarly complemented with the PoNBS1 cDNA lacking the FHA domain that had a normal phenotype except for hyphal growth. These results suggest that PoNBS1 is involved in DNA repair and normal development in P. oryzae. Moreover, the FHA domain of PoNBS1 participates in normal hyphal growth.
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Affiliation(s)
- Megumi Narukawa-Nara
- a Department of Applied Biological Science, Faculty of Science and Technology , Tokyo University of Science , Noda , Japan
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8
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Abstract
The ataxia-telangiectasia mutated (ATM) protein kinase is a master regulator of the DNA damage response, and it coordinates checkpoint activation, DNA repair, and metabolic changes in eukaryotic cells in response to DNA double-strand breaks and oxidative stress. Loss of ATM activity in humans results in the pleiotropic neurodegeneration disorder ataxia-telangiectasia. ATM exists in an inactive state in resting cells but can be activated by the Mre11-Rad50-Nbs1 (MRN) complex and other factors at sites of DNA breaks. In addition, oxidation of ATM activates the kinase independently of the MRN complex. This review discusses these mechanisms of activation, as well as the posttranslational modifications that affect this process and the cellular factors that affect the efficiency and specificity of ATM activation and substrate phosphorylation. I highlight functional similarities between the activation mechanisms of ATM, phosphatidylinositol 3-kinases (PI3Ks), and the other PI3K-like kinases, as well as recent structural insights into their regulation.
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Affiliation(s)
- Tanya T Paull
- Howard Hughes Medical Institute, Department of Molecular Biosciences, and Institute for Cellular and Molecular Biology, University of Texas, Austin, Texas 78712;
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9
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A spontaneous Cdt1 mutation in 129 mouse strains reveals a regulatory domain restraining replication licensing. Nat Commun 2013; 4:2065. [PMID: 23817338 DOI: 10.1038/ncomms3065] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2012] [Accepted: 05/29/2013] [Indexed: 12/25/2022] Open
Abstract
Cdt1 is required for loading the replicative DNA helicase MCM2/7, a process known as DNA replication licensing. Here we show that 129 mouse strains express a Cdt1 mutated allele with enhanced licensing activity. The mutation, named Δ(6)PEST, involves a six-amino acid deletion within a previously uncharacterized PEST-like domain. Cdt1 Δ(6)PEST and more extensive deletions exhibit increased re-replication and transformation activities that are independent of the Geminin and E3 ligase pathways. This PEST domain negatively regulates cell cycle-dependent chromatin recruitment of Cdt1 in G2/M phases of the cell cycle. Mass spectrometry analysis indicates that Cdt1 is phosphorylated at sites within the deleted PEST domain during mitosis. This study reveals a conserved new regulatory Cdt1 domain crucial for proper DNA licensing activity and suggests a mechanism by which the presence of Cdt1 in G2/M phases does not lead to premature origin licensing. These results also question the usage of 129 mouse strains for knockout analyses.
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10
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The ATM-mediated DNA-damage response. Mol Oncol 2013. [DOI: 10.1017/cbo9781139046947.035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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11
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Iwahori S, Kohmon D, Kobayashi J, Tani Y, Yugawa T, Komatsu K, Kiyono T, Sugimoto N, Fujita M. ATM regulates Cdt1 stability during the unperturbed S phase to prevent re-replication. Cell Cycle 2013; 13:471-81. [PMID: 24280901 PMCID: PMC3956543 DOI: 10.4161/cc.27274] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Ataxia-telangiectasia mutated (ATM) plays crucial roles in DNA damage responses, especially with regard to DNA double-strand breaks (DSBs). However, it appears that ATM can be activated not only by DSB, but also by some changes in chromatin architecture, suggesting potential ATM function in cell cycle control. Here, we found that ATM is involved in timely degradation of Cdt1, a critical replication licensing factor, during the unperturbed S phase. At least in certain cell types, degradation of p27Kip1 was also impaired by ATM inhibition. The novel ATM function for Cdt1 regulation was dependent on its kinase activity and NBS1. Indeed, we found that ATM is moderately phosphorylated at Ser1981 during the S phase. ATM silencing induced partial reduction in levels of Skp2, a component of SCFSkp2 ubiquitin ligase that controls Cdt1 degradation. Furthermore, Skp2 silencing resulted in Cdt1 stabilization like ATM inhibition. In addition, as reported previously, ATM silencing partially prevented Akt phosphorylation at Ser473, indicative of its activation, and Akt inhibition led to modest stabilization of Cdt1. Therefore, the ATM-Akt-SCFSkp2 pathway may partly contribute to the novel ATM function. Finally, ATM inhibition rendered cells hypersensitive to induction of re-replication, indicating importance for maintenance of genome stability.
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Affiliation(s)
- Satoko Iwahori
- Virology Division; National Cancer Center Research Institute; Chuohku, Tokyo, Japan
| | - Daisuke Kohmon
- Department of Cellular Biochemistry; Graduate School of Pharmaceutical Sciences; Kyushu University; Higashiku, Fukuoka, Japan
| | - Junya Kobayashi
- Radiation Biology Center; Kyoto University; Sakyo-ku, Kyoto, Japan
| | - Yuhei Tani
- Department of Cellular Biochemistry; Graduate School of Pharmaceutical Sciences; Kyushu University; Higashiku, Fukuoka, Japan
| | - Takashi Yugawa
- Virology Division; National Cancer Center Research Institute; Chuohku, Tokyo, Japan
| | - Kenshi Komatsu
- Radiation Biology Center; Kyoto University; Sakyo-ku, Kyoto, Japan
| | - Tohru Kiyono
- Virology Division; National Cancer Center Research Institute; Chuohku, Tokyo, Japan
| | - Nozomi Sugimoto
- Department of Cellular Biochemistry; Graduate School of Pharmaceutical Sciences; Kyushu University; Higashiku, Fukuoka, Japan
| | - Masatoshi Fujita
- Department of Cellular Biochemistry; Graduate School of Pharmaceutical Sciences; Kyushu University; Higashiku, Fukuoka, Japan
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12
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Song J, Hao Y, Du Z, Wang Z, Ewing RM. Identifying novel protein complexes in cancer cells using epitope-tagging of endogenous human genes and affinity-purification mass spectrometry. J Proteome Res 2012; 11:5630-41. [PMID: 23106643 DOI: 10.1021/pr300598t] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Affinity-purification mass spectrometry (AP-MS) is the preeminent technique for identification of eukaryotic protein complexes in vivo. AP-MS workflows typically express epitope-tagged bait proteins, immunopurify, and then identify associated protein complexes using mass spectrometry. However, challenges of existing strategies include the construction of expression vectors for large open reading frames and the possibility that overexpression of bait proteins may result in expression of nonphysiological levels of the bait protein with concomitant perturbation of endogenous protein complexes. To address these issues, we use human cell lines with epitope-tagged endogenous genes as AP-MS substrates to develop a platform that we call "knock-in AP-MS", thereby avoiding the challenges of expression vector construction and ensuring that expression of tagged proteins is driven by endogenous regulatory mechanisms. Using three different bait genes (MRE11A, DNMT1 and APC), we show that cell lines expressing epitope-tagged endogenous genes make good substrates for sensitive and reproducible identification of protein interactions using AP-MS. In particular, we identify novel interactors of the important oncoprotein Adenomatous Polyposis Coli (APC), including an interaction with Flightless-1 homologue (FLII) that is enriched in nuclear fractions.
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Affiliation(s)
- Jing Song
- Center for Proteomics and Bioinformatics, Department of Genetics and Genome Science, Case Western Reserve University School of Medicine, Cleveland, Ohio 44106, United States
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13
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Klotz-Noack K, McIntosh D, Schurch N, Pratt N, Blow JJ. Re-replication induced by geminin depletion occurs from G2 and is enhanced by checkpoint activation. J Cell Sci 2012; 125:2436-45. [PMID: 22366459 PMCID: PMC3481538 DOI: 10.1242/jcs.100883] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
To prevent re-replication of DNA in a single cell cycle, the licensing of replication origins by Mcm2-7 is prevented during S and G2 phases. Animal cells achieve this by cell-cycle-regulated proteolysis of the essential licensing factor Cdt1 and inhibition of Cdt1 by geminin. Here we investigate the consequences of ablating geminin in synchronised human U2OS cells. Following geminin loss, cells complete an apparently normal S phase, but a proportion arrest at the G2-M boundary. When Cdt1 accumulates in these cells, DNA re-replicates, suggesting that the key role of geminin is to prevent re-licensing in G2. If cell cycle checkpoints are inhibited in cells lacking geminin, cells progress through mitosis and less re-replication occurs. Checkpoint kinases thereby amplify re-replication into an all-or-nothing response by delaying geminin-depleted cells in G2. Deep DNA sequencing revealed no preferential re-replication of specific genomic regions after geminin depletion. This is consistent with the observation that cells in G2 have lost their replication timing information. By contrast, when Cdt1 is overexpressed or is stabilised by the neddylation inhibitor MLN4924, re-replication can occur throughout S phase.
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Affiliation(s)
- Kathleen Klotz-Noack
- Wellcome Trust Centre for Gene Regulation and Expression, College of Life Sciences, University of Dundee, Dundee DD1 5EH, UK
| | - Debbie McIntosh
- Wellcome Trust Centre for Gene Regulation and Expression, College of Life Sciences, University of Dundee, Dundee DD1 5EH, UK
| | - Nicholas Schurch
- Data Analysis Group, College of Life Sciences, University of Dundee DD1 5EH, UK
| | - Norman Pratt
- Department of Human Genetics, Ninewells Hospital, Dundee DD1 9SY, UK
| | - J. Julian Blow
- Wellcome Trust Centre for Gene Regulation and Expression, College of Life Sciences, University of Dundee, Dundee DD1 5EH, UK
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14
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Lee AYL, Chiba T, Truong LN, Cheng AN, Do J, Cho MJ, Chen L, Wu X. Dbf4 is direct downstream target of ataxia telangiectasia mutated (ATM) and ataxia telangiectasia and Rad3-related (ATR) protein to regulate intra-S-phase checkpoint. J Biol Chem 2011; 287:2531-43. [PMID: 22123827 DOI: 10.1074/jbc.m111.291104] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Dbf4/Cdc7 (Dbf4-dependent kinase (DDK)) is activated at the onset of S-phase, and its kinase activity is required for DNA replication initiation from each origin. We showed that DDK is an important target for the S-phase checkpoint in mammalian cells to suppress replication initiation and to protect replication forks. We demonstrated that ataxia telangiectasia mutated (ATM) and ataxia telangiectasia and Rad3-related (ATR) proteins directly phosphorylate Dbf4 in response to ionizing radiation and replication stress. We identified novel ATM/ATR phosphorylation sites on Dbf4 and showed that ATM/ATR-mediated phosphorylation of Dbf4 is critical for the intra-S-phase checkpoint to inhibit DNA replication. The kinase activity of DDK, which is not suppressed upon DNA damage, is required for fork protection under replication stress. We further demonstrated that ATM/ATR-mediated phosphorylation of Dbf4 is important for preventing DNA rereplication upon loss of replication licensing through the activation of the S-phase checkpoint. These studies indicate that DDK is a direct substrate of ATM and ATR to mediate the intra-S-phase checkpoint in mammalian cells.
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Affiliation(s)
- Alan Yueh-Luen Lee
- Department of Molecular and Experimental Medicine, The Scripps Research Institute, La Jolla, California 92037, USA.
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15
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Bhatti S, Kozlov S, Farooqi AA, Naqi A, Lavin M, Khanna KK. ATM protein kinase: the linchpin of cellular defenses to stress. Cell Mol Life Sci 2011; 68:2977-3006. [PMID: 21533982 PMCID: PMC11115042 DOI: 10.1007/s00018-011-0683-9] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2011] [Revised: 03/24/2011] [Accepted: 03/29/2011] [Indexed: 01/23/2023]
Abstract
ATM is the most significant molecule involved in monitoring the genomic integrity of the cell. Any damage done to DNA relentlessly challenges the cellular machinery involved in recognition, processing and repair of these insults. ATM kinase is activated early to detect and signal lesions in DNA, arrest the cell cycle, establish DNA repair signaling and faithfully restore the damaged chromatin. ATM activation plays an important role as a barrier to tumorigenesis, metabolic syndrome and neurodegeneration. Therefore, studies of ATM-dependent DNA damage signaling pathways hold promise for treatment of a variety of debilitating diseases through the development of new therapeutics capable of modulating cellular responses to stress. In this review, we have tried to untangle the complex web of ATM signaling pathways with the purpose of pinpointing multiple roles of ATM underlying the complex phenotypes observed in AT patients.
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Affiliation(s)
- Shahzad Bhatti
- Institute of Molecular Biology and Biotechnology, The University of Lahore, 1 Km Raiwind Road, Thokar Niaz Baig, Lahore, Pakistan
| | - Sergei Kozlov
- Queensland Institute of Medical Research, QIMR, 300 Herston Rd, Herston, Brisbane, 4029 Australia
| | - Ammad Ahmad Farooqi
- Institute of Molecular Biology and Biotechnology, The University of Lahore, 1 Km Raiwind Road, Thokar Niaz Baig, Lahore, Pakistan
| | - Ali Naqi
- Institute of Molecular Biology and Biotechnology, The University of Lahore, 1 Km Raiwind Road, Thokar Niaz Baig, Lahore, Pakistan
| | - Martin Lavin
- Queensland Institute of Medical Research, QIMR, 300 Herston Rd, Herston, Brisbane, 4029 Australia
| | - Kum Kum Khanna
- Queensland Institute of Medical Research, QIMR, 300 Herston Rd, Herston, Brisbane, 4029 Australia
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16
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Abstract
DNA replication is a highly regulated process involving a number of licensing and replication factors that function in a carefully orchestrated manner to faithfully replicate DNA during every cell cycle. Loss of proper licensing control leads to deregulated DNA replication including DNA re-replication, which can cause genome instability and tumorigenesis. Eukaryotic organisms have established several conserved mechanisms to prevent DNA re-replication and to counteract its potentially harmful effects. These mechanisms include tightly controlled regulation of licensing factors and activation of cell cycle and DNA damage checkpoints. Deregulated licensing control and its associated compromised checkpoints have both been observed in tumor cells, indicating that proper functioning of these pathways is essential for maintaining genome stability. In this review, we discuss the regulatory mechanisms of licensing control, the deleterious consequences when both licensing and checkpoints are compromised, and present possible mechanisms to prevent re-replication in order to maintain genome stability.
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Affiliation(s)
- Lan N Truong
- Department of Molecular and Experimental Medicine, The Scripps Research Institute, La Jolla, CA 92037, USA
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17
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Milhollen MA, Narayanan U, Soucy TA, Veiby PO, Smith PG, Amidon B. Inhibition of NEDD8-activating enzyme induces rereplication and apoptosis in human tumor cells consistent with deregulating CDT1 turnover. Cancer Res 2011; 71:3042-51. [PMID: 21487042 DOI: 10.1158/0008-5472.can-10-2122] [Citation(s) in RCA: 118] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Loss of NEDD8-activating enzyme (NAE) function by siRNA knockdown or inhibition by the small molecule NAE inhibitor MLN4924 leads to increased steady-state levels of direct Cullin-RING ligase (CRL) substrates by preventing their ubiquitination and proteasome-dependent degradation. Many of these CRL substrates are involved in cell cycle progression, including a critical DNA replication licensing factor CDT1. Cell cycle analysis of asynchronous and synchronous cultures after NAE inhibition revealed effects on cell cycle distribution and activation of DNA break repair signaling pathways similar to that reported for CDT1 overexpression. The siRNA knockdown of cullins critical for the turnover of CDT1 recapitulated the aberrant rereplication phenotype while CDT1 knockdown was suppressing. Although NAE inhibition leads to deregulation of many CRL substrates, these data demonstrate that CDT1 accumulation mediates the DNA rereplication phenotype resulting from loss of NAE function. DNA rereplication is an unrecoverable cellular insult and the small molecule inhibitor MLN4924, currently in phase I trials, represents an unprecedented opportunity to explore this mechanism of cytotoxicity for the treatment of cancer.
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Affiliation(s)
- Michael A Milhollen
- Discovery, Millennium Pharmaceuticals, Inc, Cambridge, Massachusetts 02139, USA.
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18
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Human T-lymphotropic type 1 virus p30 inhibits homologous recombination and favors unfaithful DNA repair. Blood 2011; 117:5897-906. [PMID: 21427292 DOI: 10.1182/blood-2010-08-304600] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Whereas oncogenic retroviruses are common in animals, human T-lymphotropic virus 1 (HTLV-1) is the only transmissible retrovirus associated with cancer in humans and is etiologically linked to adult T-cell leukemia. The leukemogenesis process is still largely unknown, but relies on extended survival and clonal expansion of infected cells, which in turn accumulate genetic defects. A common feature of human tumor viruses is their ability to stimulate proliferation and survival of infected pretumoral cells and then hide by establishing latency in cells that have acquired a transformed phenotype. Whereas disruption of the DNA repair is one of the major processes responsible for the accumulation of genomic abnormalities and carcinogenesis, the absence of DNA repair also poses the threat of cell-cycle arrest or apoptosis of virus-infected cells. This study describes how the HTLV-1 p30 viral protein inhibits conservative homologous recombination (HR) DNA repair by targeting the MRE11/RAD50/NBS1 complex and favors the error-prone nonhomologous-end-joining (NHEJ) DNA-repair pathway instead. As a result, HTLV-1 p30 may facilitate the accumulation of mutations in the host genome and the cumulative risk of transformation. Our results provide new insights into how human tumor viruses may manipulate cellular DNA-damage responses to promote cancer.
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19
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Abstract
The maintenance of genome stability depends on the DNA damage response (DDR), which is a functional network comprising signal transduction, cell cycle regulation and DNA repair. The metabolism of DNA double-strand breaks governed by the DDR is important for preventing genomic alterations and sporadic cancers, and hereditary defects in this response cause debilitating human pathologies, including developmental defects and cancer. The MRE11 complex, composed of the meiotic recombination 11 (MRE11), RAD50 and Nijmegen breakage syndrome 1 (NBS1; also known as nibrin) proteins is central to the DDR, and recent insights into its structure and function have been gained from in vitro structural analysis and studies of animal models in which the DDR response is deficient.
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Affiliation(s)
- Travis H Stracker
- Institute for Research in Biomedicine Barcelona, C/ Baldiri Reixac 10, 08028 Barcelona, Spain.
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20
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Wang HM, Cheng KC, Lin CJ, Hsu SW, Fang WC, Hsu TF, Chiu CC, Chang HW, Hsu CH, Lee AYL. Obtusilactone A and (-)-sesamin induce apoptosis in human lung cancer cells by inhibiting mitochondrial Lon protease and activating DNA damage checkpoints. Cancer Sci 2010; 101:2612-20. [PMID: 21077998 PMCID: PMC11158771 DOI: 10.1111/j.1349-7006.2010.01701.x] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Several compounds from Cinnamomum kotoense show anticancer activities. However, the detailed mechanisms of most compounds from C. kotoense remain unknown. In this study, we investigated the anticancer activity of obtusilactone A (OA) and (-)-sesamin in lung cancer. Our results show that human Lon is upregulated in non-small-cell lung cancer (NSCLC) cell lines, and downregulation of Lon triggers caspase-3 mediated apoptosis. Through enzyme-based screening, we identified two small-molecule compounds, obtusilactone A (OA) and (-)-sesamin from C. kotoense, as potent Lon protease inhibitors. Obtusilactone A and (-)-sesamin interact with Ser855 and Lys898 residues in the active site of the Lon protease according to molecular docking analysis. Thus, we suggest that cancer cytotoxicity of the compounds is partly due to the inhibitory effects on Lon protease. In addition, the compounds are able to cause DNA double-strand breaks and activate checkpoints. Treatment with OA and (-)-sesamin induced p53-independent DNA damage responses in NSCLC cells, including G(1) /S checkpoint activation and apoptosis, as evidenced by phosphorylation of checkpoint proteins (H2AX, Nbs1, and Chk2), caspase-3 cleavage, and sub-G(1) accumulation. In conclusion, OA and (-)-sesamin act as both inhibitors of human mitochondrial Lon protease and DNA damage agents to activate the DNA damage checkpoints as well induce apoptosis in NSCLC cells. These dual functions open a bright avenue to develop more selective chemotherapy agents to overcome chemoresistance and sensitize cancer cells to other chemotherapeutics.
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Affiliation(s)
- Hui-Min Wang
- Department of Fragrance and Cosmetic Science, Kaohsiung Medical University, Kaohsiung, Taiwan
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21
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Shimada M, Komatsu K. Emerging connection between centrosome and DNA repair machinery. JOURNAL OF RADIATION RESEARCH 2009; 50:295-301. [PMID: 19542690 DOI: 10.1269/jrr.09039] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Centrosomes function in proper cell division in animal cells. The centrosome consists of a pair of centrioles and the surrounding pericentriolar matrix (PCM). After cytokinesis, daughter cells each acquire one centrosome, which subsequently duplicates at the G1/S phase in a manner that is dependent upon CDK2/cyclin-E activity. Defects in the regulation of centrosome duplication lead to tumorigenesis through abnormal cell division and resulting inappropriate chromosome segregation. Therefore, maintenance of accurate centrosome number is important for cell fate. Excess number of centrosomes can be induced by several factors including ionizing radiation (IR). Recent studies have shown that several DNA repair proteins localize to the centrosome and are involved in the regulation of centrosome number possibly through cell cycle checkpoints or direct modification of centrosome proteins. Furthermore, it has been reported that the development of microcephaly is likely caused by defective expression of centrosome proteins, such as ASPM, which are also involved in the response to IR. The present review highlights centrosome duplication in association with genotoxic stresses and the regulatory mechanism mediated by DNA repair proteins.Translated and modified from Radiat. Biol. Res. Comm. Vol.43; 343-356 (2008.12, in Japanese).
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Affiliation(s)
- Mikio Shimada
- Department of Genome Repair Dynamics, Radiation Biology Center, Kyoto University, Kyoto, Japan.
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22
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Carson CT, Orazio NI, Lee DV, Suh J, Bekker-Jensen S, Araujo FD, Lakdawala SS, Lilley CE, Bartek J, Lukas J, Weitzman MD. Mislocalization of the MRN complex prevents ATR signaling during adenovirus infection. EMBO J 2009; 28:652-62. [PMID: 19197236 PMCID: PMC2666027 DOI: 10.1038/emboj.2009.15] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2008] [Accepted: 12/23/2008] [Indexed: 01/13/2023] Open
Abstract
The protein kinases ataxia-telangiectasia mutated (ATM) and ATM-Rad3 related (ATR) are activated in response to DNA damage, genotoxic stress and virus infections. Here we show that during infection with wild-type adenovirus, ATR and its cofactors RPA32, ATRIP and TopBP1 accumulate at viral replication centres, but there is minimal ATR activation. We show that the Mre11/Rad50/Nbs1 (MRN) complex is recruited to viral centres only during infection with adenoviruses lacking the early region E4 and ATR signaling is activated. This suggests a novel requirement for the MRN complex in ATR activation during virus infection, which is independent of Mre11 nuclease activity and recruitment of RPA/ATR/ATRIP/TopBP1. Unlike other damage scenarios, we found that ATM and ATR signaling are not dependent on each other during infection. We identify a region of the viral E4orf3 protein responsible for immobilization of the MRN complex and show that this prevents ATR signaling during adenovirus infection. We propose that immobilization of the MRN damage sensor by E4orf3 protein prevents recognition of viral genomes and blocks detrimental aspects of checkpoint signaling during virus infection.
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Affiliation(s)
- Christian T Carson
- Laboratory of Genetics, The Salk Institute for Biological Studies, La Jolla, CA, USA
- Graduate Program, Division of Biology, University of California, San Diego, CA, USA
| | - Nicole I Orazio
- Laboratory of Genetics, The Salk Institute for Biological Studies, La Jolla, CA, USA
- Graduate Program, Division of Biology, University of California, San Diego, CA, USA
| | - Darwin V Lee
- Laboratory of Genetics, The Salk Institute for Biological Studies, La Jolla, CA, USA
| | - Junghae Suh
- Laboratory of Genetics, The Salk Institute for Biological Studies, La Jolla, CA, USA
| | - Simon Bekker-Jensen
- Centre for Genotoxic Stress Research, Institute of Cancer Biology, Danish Cancer Society, Copenhagen, Denmark
| | - Felipe D Araujo
- Laboratory of Genetics, The Salk Institute for Biological Studies, La Jolla, CA, USA
| | - Seema S Lakdawala
- Laboratory of Genetics, The Salk Institute for Biological Studies, La Jolla, CA, USA
- Graduate Program, Division of Biology, University of California, San Diego, CA, USA
| | - Caroline E Lilley
- Laboratory of Genetics, The Salk Institute for Biological Studies, La Jolla, CA, USA
| | - Jiri Bartek
- Centre for Genotoxic Stress Research, Institute of Cancer Biology, Danish Cancer Society, Copenhagen, Denmark
| | - Jiri Lukas
- Centre for Genotoxic Stress Research, Institute of Cancer Biology, Danish Cancer Society, Copenhagen, Denmark
| | - Matthew D Weitzman
- Laboratory of Genetics, The Salk Institute for Biological Studies, La Jolla, CA, USA
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23
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Shimada M, Sagae R, Kobayashi J, Habu T, Komatsu K. Inactivation of the Nijmegen breakage syndrome gene leads to excess centrosome duplication via the ATR/BRCA1 pathway. Cancer Res 2009; 69:1768-75. [PMID: 19244116 DOI: 10.1158/0008-5472.can-08-3016] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Nijmegen breakage syndrome is characterized by genomic instability and a predisposition for lymphoma and solid tumors. Nijmegen breakage syndrome 1 (NBS1), the protein which is mutated in these patients, functions in association with BRCA1 and ATR as part of the cellular response to DNA double-strand breaks. We show here that NBS1 forms foci at the centrosomes via an interaction with gamma-tubulin. Down-regulation of NBS1 by small interfering RNA induces supernumerary centrosomes, and this was confirmed with experiments using Nbs1 knockout mouse cells; the introduction of wild-type NBS1 (wt-NBS1) cDNA into these knockout mouse cells reduced the number of supernumerary centrosomes to normal levels. This phenotype in NBS1-deficient cells is caused by both centrosome duplication and impaired separation of centrioles, which have been observed in BRCA1-inhibited cells. In fact, supernumerary centrosomes were observed in Brca1 knockout mouse cells, and the frequency was not affected by NBS1 down-regulation, suggesting that NBS1 maintains centrosomes via a common pathway with BRCA1. This is consistent with findings that NBS1 physically interacts with BRCA1 at the centrosomes and is required for BRCA1-mediated ubiquitination of gamma-tubulin. Moreover, the ubiquitination of gamma-tubulin is compromised by either ATR depletion or an NBS1 mutation in the ATR interacting (FHA) domain, which is essential for ATR activation. These results suggest that, although centrosomes lack DNA, the NBS1/ATR/BRCA1 repair machinery affects centrosome behavior, and this might be a crucial role in the prevention of malignances.
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Affiliation(s)
- Mikio Shimada
- Radiation Biology Center, Kyoto University, Kyoto, Japan
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24
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Tsuyama T, Watanabe S, Aoki A, Cho Y, Seki M, Enomoto T, Tada S. Repression of nascent strand elongation by deregulated Cdt1 during DNA replication in Xenopus egg extracts. Mol Biol Cell 2008; 20:937-47. [PMID: 19064889 DOI: 10.1091/mbc.e08-06-0613] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Excess Cdt1 reportedly induces rereplication of chromatin in cultured cells and Xenopus egg extracts, suggesting that the regulation of Cdt1 activity by cell cycle-dependent proteolysis and expression of the Cdt1 inhibitor geminin is crucial for the inhibition of chromosomal overreplication between S phase and metaphase. We analyzed the consequences of excess Cdt1 for DNA replication and found that increased Cdt1 activity inhibited the elongation of nascent strands in Xenopus egg extracts. In Cdt1-supplemented extracts, overreplication was remarkably induced by the further addition of the Cdt1-binding domain of geminin (Gem79-130), which lacks licensing inhibitor activity. Further analyses indicated that fully active geminin, as well as Gem79-130, restored nascent strand elongation in Cdt1-supplemented extracts even after the Cdt1-induced stalling of replication fork elongation had been established. Our results demonstrate an unforeseen, negative role for Cdt1 in elongation and suggest that its function in the control of replication should be redefined. We propose a novel surveillance mechanism in which Cdt1 blocks nascent chain elongation after detecting illegitimate activation of the licensing system.
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Affiliation(s)
- Takashi Tsuyama
- Molecular Cell Biology Laboratory, Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Miyagi, 980-8578, Japan
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25
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Dorn ES, Chastain PD, Hall JR, Cook JG. Analysis of re-replication from deregulated origin licensing by DNA fiber spreading. Nucleic Acids Res 2008; 37:60-9. [PMID: 19010964 PMCID: PMC2615611 DOI: 10.1093/nar/gkn912] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
A major challenge each human cell-division cycle is to ensure that DNA replication origins do not initiate more than once, a phenomenon known as re-replication. Acute deregulation of replication control ultimately causes extensive DNA damage, cell-cycle checkpoint activation and cell death whereas moderate deregulation promotes genome instability and tumorigenesis. In the absence of detectable increases in cellular DNA content however, it has been difficult to directly demonstrate re-replication or to determine if the ability to re-replicate is restricted to a particular cell-cycle phase. Using an adaptation of DNA fiber spreading we report the direct detection of re-replication on single DNA molecules from human chromosomes. Using this method we demonstrate substantial re-replication within 1 h of S phase entry in cells overproducing the replication factor, Cdt1. Moreover, a comparison of the HeLa cancer cell line to untransformed fibroblasts suggests that HeLa cells produce replication signals consistent with low-level re-replication in otherwise unperturbed cell cycles. Re-replication after depletion of the Cdt1 inhibitor, geminin, in an untransformed fibroblast cell line is undetectable by standard assays but readily quantifiable by DNA fiber spreading analysis. Direct evaluation of re-replicated DNA molecules will promote increased understanding of events that promote or perturb genome stability.
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Affiliation(s)
- Elizabeth S Dorn
- Department of Biochemistry and Biophysics, Lineberger Comprehensive Cancer Center, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7260, USA
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26
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Hall JR, Lee HO, Bunker BD, Dorn ES, Rogers GC, Duronio RJ, Cook JG. Cdt1 and Cdc6 are destabilized by rereplication-induced DNA damage. J Biol Chem 2008; 283:25356-25363. [PMID: 18617514 DOI: 10.1074/jbc.m802667200] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The replication factors Cdt1 and Cdc6 are essential for origin licensing, a prerequisite for DNA replication initiation. Mechanisms to ensure that metazoan origins initiate once per cell cycle include degradation of Cdt1 during S phase and inhibition of Cdt1 by the geminin protein. Geminin depletion or overexpression of Cdt1 or Cdc6 in human cells causes rereplication, a form of endogenous DNA damage. Rereplication induced by these manipulations is however uneven and incomplete, suggesting that one or more mechanisms restrain rereplication once it begins. We find that both Cdt1 and Cdc6 are degraded in geminin-depleted cells. We further show that Cdt1 degradation in cells that have rereplicated requires the PCNA binding site of Cdt1 and the Cul4(DDB1) ubiquitin ligase, and Cdt1 can induce its own degradation when overproduced. Cdc6 degradation in geminin-depleted cells requires Huwe1, the ubiquitin ligase that regulates Cdc6 after DNA damage. Moreover, perturbations that specifically disrupt Cdt1 and Cdc6 degradation in response to DNA damage exacerbate rereplication when combined with geminin depletion, and this enhanced rereplication occurs in both human cells and in Drosophila melanogaster cells. We conclude that rereplication-associated DNA damage triggers Cdt1 and Cdc6 ubiquitination and destruction, and propose that this pathway represents an evolutionarily conserved mechanism that minimizes the extent of rereplication.
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Affiliation(s)
- Jonathan R Hall
- Department of Biochemistry and Biophysics, Chapel Hill, North Carolina 27599-7260
| | - Hyun O Lee
- Department of Curriculum in Genetics and Molecular Biology, Chapel Hill, North Carolina 27599-7260
| | - Brandon D Bunker
- Department of Biochemistry and Biophysics, Chapel Hill, North Carolina 27599-7260
| | - Elizabeth S Dorn
- Department of Biochemistry and Biophysics, Chapel Hill, North Carolina 27599-7260
| | - Greg C Rogers
- Department of Biology, Chapel Hill, North Carolina 27599-7260
| | - Robert J Duronio
- Department of Curriculum in Genetics and Molecular Biology, Chapel Hill, North Carolina 27599-7260; Department of Biology, Chapel Hill, North Carolina 27599-7260; Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7260
| | - Jeanette Gowen Cook
- Department of Biochemistry and Biophysics, Chapel Hill, North Carolina 27599-7260; Department of Curriculum in Genetics and Molecular Biology, Chapel Hill, North Carolina 27599-7260; Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7260.
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27
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Biton S, Barzilai A, Shiloh Y. The neurological phenotype of ataxia-telangiectasia: solving a persistent puzzle. DNA Repair (Amst) 2008; 7:1028-38. [PMID: 18456574 DOI: 10.1016/j.dnarep.2008.03.006] [Citation(s) in RCA: 105] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Human genomic instability syndromes affect the nervous system to different degrees of severity, attesting to the vulnerability of the CNS to perturbations of genomic integrity and the DNA damage response (DDR). Ataxia-telangiectasia (A-T) is a typical genomic instability syndrome whose major characteristic is progressive neuronal degeneration but is also associated with immunodeficiency, cancer predisposition and acute sensitivity to ionizing radiation and radiomimetic chemicals. A-T is caused by loss or inactivation of the ATM protein kinase, which mobilizes the complex, multi-branched cellular response to double strand breaks in the DNA by phosphorylating numerous DDR players. The link between ATM's function in the DDR and the neuronal demise in A-T has been questioned in the past. However, recent studies of the ATM-mediated DDR in neurons suggest that the neurological phenotype in A-T is indeed caused by deficiency in this function, similar to other features of the disease. Still, major issues concerning this phenotype remain open, including the presumed differences between the DDR in post-mitotic neurons and proliferating cells, the nature of the damage that accumulates in the DNA of ATM-deficient neurons under normal life conditions, the mode of death of ATM-deficient neurons, and the lack of a major neuronal phenotype in the mouse model of A-T. A-T remains a prototype disease for the study of the DDR's role in CNS development and maintenance.
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Affiliation(s)
- Sharon Biton
- Department of Human Molecular Genetics and Biochemistry, Sackler School of Medicine, Tel Aviv University, Tel Aviv 69978, Israel
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Ataxia telangiectasia-mutated damage-signaling kinase- and proteasome-dependent destruction of Mre11-Rad50-Nbs1 subunits in Simian virus 40-infected primate cells. J Virol 2008; 82:5316-28. [PMID: 18353955 DOI: 10.1128/jvi.02677-07] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Although the mechanism of simian virus 40 (SV40) DNA replication has been extensively investigated with cell extracts, viral DNA replication in productively infected cells utilizes additional viral and host functions whose interplay remains poorly understood. We show here that in SV40-infected primate cells, the activated ataxia telangiectasia-mutated (ATM) damage-signaling kinase, gamma-H2AX, and Mre11-Rad50-Nbs1 (MRN) assemble with T antigen and other viral DNA replication proteins in large nuclear foci. During infection, steady-state levels of MRN subunits decline, although the corresponding mRNA levels remain unchanged. A proteasome inhibitor stabilizes the MRN complex, suggesting that MRN may undergo proteasome-dependent degradation. Analysis of mutant T antigens with disrupted binding to the ubiquitin ligase CUL7 revealed that MRN subunits are stable in cells infected with mutant virus or transfected with mutant viral DNA, implicating CUL7 association with T antigen in MRN proteolysis. The mutant genomes produce fewer virus progeny than the wild type, suggesting that T antigen-CUL7-directed proteolysis facilitates virus propagation. Use of a specific ATM kinase inhibitor showed that ATM kinase signaling is a prerequisite for proteasome-dependent degradation of MRN subunits as well as for the localization of T antigen and damage-signaling proteins to viral replication foci and optimal viral DNA replication. Taken together, the results indicate that SV40 infection manipulates host DNA damage-signaling to reprogram the cell for viral replication, perhaps through mechanisms related to host recovery from DNA damage.
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