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Krüger K, Geist K, Stuhldreier F, Schumacher L, Blümel L, Remke M, Wesselborg S, Stork B, Klöcker N, Bormann S, Roos WP, Honnen S, Fritz G. Multiple DNA damage-dependent and DNA damage-independent stress responses define the outcome of ATR/Chk1 targeting in medulloblastoma cells. Cancer Lett 2018; 430:34-46. [PMID: 29753759 DOI: 10.1016/j.canlet.2018.05.011] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Revised: 05/03/2018] [Accepted: 05/08/2018] [Indexed: 01/04/2023]
Abstract
Targeting of oncogene-driven replicative stress as therapeutic option for high-risk medullobastoma was assessed using a panel of medulloblastoma cells differing in their c-Myc expression [i.e. group SHH (c-Myc low) vs. group 3 (c-Myc high)]. High c-Myc levels were associated with hypersensitivity to pharmacological Chk1 and ATR inhibition but not to CDK inhibition nor to conventional (genotoxic) anticancer therapeutics. The enhanced sensitivity of group 3 medulloblastoma cells to Chk1 inhibitors likely results from enhanced damage to intracellular organelles, elevated replicative stress and DNA damage and activation of apoptosis/necrosis. Furthermore, Chk1 inhibition differentially affected c-Myc expression and functions. In c-Myc high cells, Chk1 blockage decreased c-Myc and p-GSK3α protein and increased p21 and GADD45A mRNA expression. By contrast, c-Myc low cells revealed increased p-GSK3β protein and CHOP and DUSP1 mRNA levels. Inhibition of Chk1 sensitized medulloblastoma cells to additional replication stress evoked by cisplatin independent of c-Myc. Importantly, Chk1 inhibition only caused minor toxicity in primary rat neurons in vitro. Collectively, targeting of ATR/Chk1 effectively triggers death in high-risk medulloblastoma, potentiates the anticancer efficacy of cisplatin and is well tolerated in non-cancerous neuronal cells.
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Affiliation(s)
- Katharina Krüger
- Institute of Toxicology, Medical Faculty, Heinrich Heine University Düsseldorf, Moorenstrasse 5, 40225, Düsseldorf, Germany
| | - Katharina Geist
- Institute of Toxicology, Medical Faculty, Heinrich Heine University Düsseldorf, Moorenstrasse 5, 40225, Düsseldorf, Germany
| | - Fabian Stuhldreier
- Institute of Molecular Medicine I, Medical Faculty, Heinrich Heine University Düsseldorf, Moorenstrasse 5, 40225, Düsseldorf, Germany
| | - Lena Schumacher
- Institute of Toxicology, Medical Faculty, Heinrich Heine University Düsseldorf, Moorenstrasse 5, 40225, Düsseldorf, Germany
| | - Lena Blümel
- Clinic of Pediatric Oncology/Neuro-Oncology, Medical Faculty, Heinrich Heine University Düsseldorf, Moorenstrasse 5, 40225, Düsseldorf, Germany
| | - Marc Remke
- Clinic of Pediatric Oncology/Neuro-Oncology, Medical Faculty, Heinrich Heine University Düsseldorf, Moorenstrasse 5, 40225, Düsseldorf, Germany
| | - Sebastian Wesselborg
- Institute of Molecular Medicine I, Medical Faculty, Heinrich Heine University Düsseldorf, Moorenstrasse 5, 40225, Düsseldorf, Germany
| | - Björn Stork
- Institute of Molecular Medicine I, Medical Faculty, Heinrich Heine University Düsseldorf, Moorenstrasse 5, 40225, Düsseldorf, Germany
| | - Nicolaj Klöcker
- Institute of Neurophysiology, Medical Faculty, Heinrich Heine University Düsseldorf, Moorenstrasse 5, 40225, Düsseldorf, Germany
| | - Stefanie Bormann
- Institute of Toxicology, Medical Faculty, Heinrich Heine University Düsseldorf, Moorenstrasse 5, 40225, Düsseldorf, Germany
| | - Wynand P Roos
- Institute of Toxicology, University Medical Center, Obere Zahlbacher Str. 67, 55131, Mainz, Germany
| | - Sebastian Honnen
- Institute of Toxicology, Medical Faculty, Heinrich Heine University Düsseldorf, Moorenstrasse 5, 40225, Düsseldorf, Germany
| | - Gerhard Fritz
- Institute of Toxicology, Medical Faculty, Heinrich Heine University Düsseldorf, Moorenstrasse 5, 40225, Düsseldorf, Germany.
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Lang PY, Gershon TR. A New Way to Treat Brain Tumors: Targeting Proteins Coded by Microcephaly Genes?: Brain tumors and microcephaly arise from opposing derangements regulating progenitor growth. Drivers of microcephaly could be attractive brain tumor targets. Bioessays 2018; 40:e1700243. [PMID: 29577351 PMCID: PMC5910257 DOI: 10.1002/bies.201700243] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Revised: 02/12/2018] [Indexed: 02/06/2023]
Abstract
New targets for brain tumor therapies may be identified by mutations that cause hereditary microcephaly. Brain growth depends on the repeated proliferation of stem and progenitor cells. Microcephaly syndromes result from mutations that specifically impair the ability of brain progenitor or stem cells to proliferate, by inducing either premature differentiation or apoptosis. Brain tumors that derive from brain progenitor or stem cells may share many of the specific requirements of their cells of origin. These tumors may therefore be susceptible to disruptions of the protein products of genes that are mutated in microcephaly. The potential for the products of microcephaly genes to be therapeutic targets in brain tumors are highlighted hereby reviewing research on EG5, KIF14, ASPM, CDK6, and ATR. Treatments that disrupt these proteins may open new avenues for brain tumor therapy that have increased efficacy and decreased toxicity.
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Affiliation(s)
- Patrick Y. Lang
- Department of Cell Biology and Physiology, School of Medicine, University of North Carolina, Chapel Hill, North Carolina 27599, USA
- Department of Neurology, School of Medicine, University of North Carolina, Chapel Hill, North Carolina 27599, USA
| | - Timothy R. Gershon
- Department of Neurology, School of Medicine, University of North Carolina, Chapel Hill, North Carolina 27599, USA
- Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, North Carolina 27599, USA
- Neuroscience Center, University of North Carolina, Chapel Hill, North Carolina 27599, USA
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53
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Abreu PL, Cunha-Oliveira T, Ferreira LMR, Urbano AM. Hexavalent chromium, a lung carcinogen, confers resistance to thermal stress and interferes with heat shock protein expression in human bronchial epithelial cells. Biometals 2018; 31:477-487. [DOI: 10.1007/s10534-018-0093-7] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2017] [Accepted: 03/13/2018] [Indexed: 12/12/2022]
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54
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Höhn A, Krüger K, Skowron MA, Bormann S, Schumacher L, Schulz WA, Hoffmann MJ, Niegisch G, Fritz G. Distinct mechanisms contribute to acquired cisplatin resistance of urothelial carcinoma cells. Oncotarget 2018; 7:41320-41335. [PMID: 27191498 PMCID: PMC5173062 DOI: 10.18632/oncotarget.9321] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2015] [Accepted: 04/22/2016] [Indexed: 12/12/2022] Open
Abstract
Cisplatin (CisPt) is frequently used in the therapy of urothelial carcinoma (UC). Its therapeutic efficacy is limited by inherent or acquired drug resistance. Here, we comparatively investigated the CisPt-induced response of two different parental urothelial carcinoma cell lines (RT-112, J-82) with that of respective drug resistant variants (RT-112R, J-82R) obtained upon month-long CisPt selection. Parental RT-112 cells were ~2.5 fold more resistant to CisPt than J-82 cells and showed a different expression pattern of CisPt-related resistance factors. CisPt resistant RT-112R and J-82R variants revealed a 2–3-fold increased CisPt resistance as compared to their corresponding parental counterparts. Acquired CisPt resistance was accompanied by morphological alterations resembling epithelial mesenchymal transition (EMT). RT-112R cells revealed lower apoptotic frequency and more pronounced G2/M arrest following CisPt exposure than RT-112 cells, whereas no differences in death induction were observed between J-82 and J-82R cells. CisPt resistant J-82R cells however were characterized by a reduced formation of CisPt-induced DNA damage and related DNA damage response (DDR) as compared to J-82 cells. Such difference was not observed between RT-112R and RT-112 cells. J-82R cells showed an enhanced sensitivity to pharmacological inhibition of checkpoint kinase 1 (Chk1) and, moreover, could be re-sensitized to CisPt upon Chk1 inhibition. Based on the data we suggest that mechanisms of acquired CisPt resistance of individual UC cells are substantially different, with apoptosis- and DDR-related mechanisms being of particular relevance. Moreover, the findings indicate that targeting of Chk1 might be useful to overcome acquired CisPt resistance of certain subtypes of UC.
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Affiliation(s)
- Annika Höhn
- Institute of Toxicology, Medical Faculty, Heinrich Heine University Düsseldorf, 40225, Düsseldorf, Germany
| | - Katharina Krüger
- Institute of Toxicology, Medical Faculty, Heinrich Heine University Düsseldorf, 40225, Düsseldorf, Germany
| | - Margaretha A Skowron
- Department of Urology, Medical Faculty, Heinrich Heine University Düsseldorf, 40225, Düsseldorf, Germany
| | - Stefanie Bormann
- Institute of Toxicology, Medical Faculty, Heinrich Heine University Düsseldorf, 40225, Düsseldorf, Germany
| | - Lena Schumacher
- Institute of Toxicology, Medical Faculty, Heinrich Heine University Düsseldorf, 40225, Düsseldorf, Germany
| | - Wolfgang A Schulz
- Department of Urology, Medical Faculty, Heinrich Heine University Düsseldorf, 40225, Düsseldorf, Germany
| | - Michèle J Hoffmann
- Department of Urology, Medical Faculty, Heinrich Heine University Düsseldorf, 40225, Düsseldorf, Germany
| | - Günter Niegisch
- Department of Urology, Medical Faculty, Heinrich Heine University Düsseldorf, 40225, Düsseldorf, Germany
| | - Gerhard Fritz
- Institute of Toxicology, Medical Faculty, Heinrich Heine University Düsseldorf, 40225, Düsseldorf, Germany
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55
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Wu W, Ma B, Ye H, Wang T, Wang X, Yang J, Wei Y, Zhu J, Chen L. Millepachine, a potential topoisomerase II inhibitor induces apoptosis via activation of NF-κB pathway in ovarian cancer. Oncotarget 2018; 7:52281-52293. [PMID: 27447570 PMCID: PMC5239551 DOI: 10.18632/oncotarget.10739] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2016] [Accepted: 06/16/2016] [Indexed: 02/05/2023] Open
Abstract
Millepachine (MIL) was a novel chalcone that was separated from Millettia pachycarpa Benth (Leguminosae). We found MIL induced apoptosis through activating NF-κB pathway both in SK-OV-3 and A2780S cells. Western blot showed that MIL increased the levels of IKKα, p-IKKα/β, p-IκBα and NF-κB (p65) proteins, and decreased the expression of IκBα protein. Immunohistochemistry analysis indicated that translocation of NF-κB into the nucleus increased in both ovarian cancer cells. EMSA assay proved MIL enhanced NF-κB DNA-binding activity in the nuclear. That specific NF-κB inhibitors alleviated MIL-induced apoptosis suggested NF-κB activation showed a pro-apoptotic function in SK-OV-3 and A2780S cells. Since NF-κB could be activated by double strand breaks and showed a pro-apoptotic function in the DNA damage response, SCGE assay and western blot revealed that MIL caused DNA strand breaks and significantly increased the level of p-ATM protein and further increased the levels of p-IKKα/β and NF-κB (p65) protein in SK-OV-3 and A2780S cells, while a specific ATM inhibitor could alleviated these effects. Moreover, Topoisomerase II drug screening kit and computer modeling assay were used to prove that MIL induced the production of linear DNA and inhibited the activity of topoisomerase II through binding with Topoisomerase II-Cleaved DNA complex to stabilize the complex. Taken together, our results identified that MIL exhibited anti-tumor activity through inhibiting topoisomerase II activity to induce tumor cells DNA damage, and MIL-activated NF-κB pathway showed a pro-apoptotic function in response to DNA damage.
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Affiliation(s)
- Wenshuang Wu
- State Key Laboratory of Biotherapy/Collaborative Innovation Center of Biotherapy and Cancer Center, West China Hospital of Sichuan University, Chengdu, China.,Department of Thyroid and Breast Surgery, West China Hospital of Sichuan University, Chengdu, China
| | - Buyun Ma
- Department of Ultrasound, West China Hospital of Sichuan University, Chengdu, China
| | - Haoyu Ye
- State Key Laboratory of Biotherapy/Collaborative Innovation Center of Biotherapy and Cancer Center, West China Hospital of Sichuan University, Chengdu, China
| | - Taijin Wang
- State Key Laboratory of Biotherapy/Collaborative Innovation Center of Biotherapy and Cancer Center, West China Hospital of Sichuan University, Chengdu, China
| | - Xiaoyan Wang
- State Key Laboratory of Biotherapy/Collaborative Innovation Center of Biotherapy and Cancer Center, West China Hospital of Sichuan University, Chengdu, China
| | - Jianhong Yang
- State Key Laboratory of Biotherapy/Collaborative Innovation Center of Biotherapy and Cancer Center, West China Hospital of Sichuan University, Chengdu, China
| | - Yuquan Wei
- State Key Laboratory of Biotherapy/Collaborative Innovation Center of Biotherapy and Cancer Center, West China Hospital of Sichuan University, Chengdu, China
| | - Jingqiang Zhu
- Department of Thyroid and Breast Surgery, West China Hospital of Sichuan University, Chengdu, China
| | - Lijuan Chen
- State Key Laboratory of Biotherapy/Collaborative Innovation Center of Biotherapy and Cancer Center, West China Hospital of Sichuan University, Chengdu, China
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Ohbayashi I, Sugiyama M. Plant Nucleolar Stress Response, a New Face in the NAC-Dependent Cellular Stress Responses. FRONTIERS IN PLANT SCIENCE 2018; 8:2247. [PMID: 29375613 PMCID: PMC5767325 DOI: 10.3389/fpls.2017.02247] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2017] [Accepted: 12/21/2017] [Indexed: 05/24/2023]
Abstract
The nucleolus is the most prominent nuclear domain, where the core processes of ribosome biogenesis occur vigorously. All these processes are finely orchestrated by many nucleolar factors to build precisely ribosome particles. In animal cells, perturbations of ribosome biogenesis, mostly accompanied by structural disorders of the nucleolus, cause a kind of cellular stress to induce cell cycle arrest, senescence, or apoptosis, which is called nucleolar stress response. The best-characterized pathway of this stress response involves p53 and MDM2 as key players. p53 is a crucial transcription factor that functions in response to not only nucleolar stress but also other cellular stresses such as DNA damage stress. These cellular stresses release p53 from the inhibition by MDM2, an E3 ubiquitin ligase targeting p53, in various ways, which leads to p53-dependent activation of a set of genes. In plants, genetic impairments of ribosome biogenesis factors or ribosome components have been shown to cause characteristic phenotypes, including a narrow and pointed leaf shape, implying a common signaling pathway connecting ribosomal perturbations and certain aspects of growth and development. Unlike animals, however, plants have neither p53 nor MDM2 family proteins. Then the question arises whether plant cells have a nucleolar stress response pathway. In recent years, it has been reported that several members of the plant-specific transcription factor family NAC play critical roles in the pathways responsive to various cellular stresses. In this mini review, we outline the plant cellular stress response pathways involving NAC transcription factors with reference to the p53-MDM2-dependent pathways of animal cells, and discuss the possible involvement of a plant-unique, NAC-mediated pathway in the nucleolar stress response in plants.
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Affiliation(s)
- Iwai Ohbayashi
- FAFU-UCR Joint Center and Fujian Provincial Key Laboratory of Haixia Applied Plant Systems Biology, Haixia Institute of Science and Technology, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Munetaka Sugiyama
- Botanical Gardens, Graduate School of Science, The University of Tokyo, Tokyo, Japan
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57
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The Influence of Genetic Stability on Aspergillus fumigatus Virulence and Azole Resistance. G3-GENES GENOMES GENETICS 2018; 8:265-278. [PMID: 29150592 PMCID: PMC5765354 DOI: 10.1534/g3.117.300265] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
Genetic stability is extremely important for the survival of every living organism, and a very complex set of genes has evolved to cope with DNA repair upon DNA damage. Here, we investigated the Aspergillus fumigatus AtmA (Ataxia-telangiectasia mutated, ATM) and AtrA kinases, and how they impact virulence and the evolution of azole resistance. We demonstrated that A. fumigatus atmA and atrA null mutants are haploid and have a discrete chromosomal polymorphism. The ΔatmA and ΔatrA strains are sensitive to several DNA-damaging agents, but surprisingly both strains were more resistant than the wild-type strain to paraquat, menadione, and hydrogen peroxide. The atmA and atrA genes showed synthetic lethality emphasizing the cooperation between both enzymes and their consequent redundancy. The lack of atmA and atrA does not cause any significant virulence reduction in A. fumigatus in a neutropenic murine model of invasive pulmonary aspergillosis and in the invertebrate alternative model Galleria mellonela. Wild-type, ΔatmA, and ΔatrA populations that were previously transferred 10 times in minimal medium (MM) in the absence of voriconazole have not shown any significant changes in drug resistance acquisition. In contrast, ΔatmA and ΔatrA populations that similarly evolved in the presence of a subinhibitory concentration of voriconazole showed an ∼5–10-fold increase when compared to the original minimal inhibitory concentration (MIC) values. There are discrete alterations in the voriconazole target Cyp51A/Erg11A or cyp51/erg11 and/or Cdr1B efflux transporter overexpression that do not seem to be the main mechanisms to explain voriconazole resistance in these evolved populations. Taken together, these results suggest that genetic instability caused by ΔatmA and ΔatrA mutations can confer an adaptive advantage, mainly in the intensity of voriconazole resistance acquisition.
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58
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Sakai Y, Yamamori T, Yoshikawa Y, Bo T, Suzuki M, Yamamoto K, Ago T, Inanami O. NADPH oxidase 4 mediates ROS production in radiation-induced senescent cells and promotes migration of inflammatory cells. Free Radic Res 2017; 52:92-102. [PMID: 29228832 DOI: 10.1080/10715762.2017.1416112] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Excessive DNA damage induced by ionising radiation (IR) to normal tissue cells is known to trigger cellular senescence, a process termed stress-induced premature senescence (SIPS). SIPS is often accompanied by the production of reactive oxygen species (ROS), and this is reported to be important for the initiation and maintenance of SIPS. However, the source of ROS during SIPS after IR and their significance in radiation-induced normal tissue damage remain elusive. In the present study, we tested the hypothesis that the NADPH oxidase (NOX) family of proteins mediates ROS production in SIPS-induced cells after IR and plays a role in SIPS-associated biological events. X-irradiation of primary mouse embryonic fibroblasts (MEFs) resulted in cellular senescence and the concomitant increase of intracellular ROS. Among all six murine NOX isoforms (NOX1-4 and DUOX1/2), only NOX4 was detectable under basal conditions and was upregulated following IR. In addition, radiation-induced ROS production was diminished by genetic or pharmacological inhibition of NOX4. Meanwhile, NOX4 deficiency did not affect the induction of cellular senescence after IR. Furthermore, the migration of human monocytic U937 cells to the culture medium collected from irradiated MEFs was significantly reduced by NOX4 inhibition, suggesting that NOX4 promotes the recruitment of inflammatory cells. Collectively, our findings imply that NOX4 mediates ROS production in radiation-induced senescent cells and contributes to normal tissue damage after IR via the recruitment of inflammatory cells and the exacerbation of tissue inflammation.
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Affiliation(s)
- Yuri Sakai
- a Laboratory of Radiation Biology, Department of Applied Veterinary Sciences, Faculty of Veterinary Medicine , Hokkaido University , Sapporo , Japan
| | - Tohru Yamamori
- a Laboratory of Radiation Biology, Department of Applied Veterinary Sciences, Faculty of Veterinary Medicine , Hokkaido University , Sapporo , Japan
| | - Yoji Yoshikawa
- b Department of Medicine and Clinical Science, Graduate School of Medical Sciences , Kyushu University , Fukuoka , Japan
| | - Tomoki Bo
- a Laboratory of Radiation Biology, Department of Applied Veterinary Sciences, Faculty of Veterinary Medicine , Hokkaido University , Sapporo , Japan
| | - Motofumi Suzuki
- c Radiation and Cancer Biology Team , National Institutes for Quantum and Radiobiological Science and Technology , Chiba , Japan
| | - Kumiko Yamamoto
- a Laboratory of Radiation Biology, Department of Applied Veterinary Sciences, Faculty of Veterinary Medicine , Hokkaido University , Sapporo , Japan
| | - Tetsuro Ago
- b Department of Medicine and Clinical Science, Graduate School of Medical Sciences , Kyushu University , Fukuoka , Japan
| | - Osamu Inanami
- a Laboratory of Radiation Biology, Department of Applied Veterinary Sciences, Faculty of Veterinary Medicine , Hokkaido University , Sapporo , Japan
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59
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Ito-Harashima S, Yagi T. Unique molecular mechanisms for maintenance and alteration of genetic information in the budding yeast Saccharomyces cerevisiae. Genes Environ 2017; 39:28. [PMID: 29213342 PMCID: PMC5709847 DOI: 10.1186/s41021-017-0088-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Accepted: 10/26/2017] [Indexed: 11/10/2022] Open
Abstract
The high-fidelity transmission of genetic information is crucial for the survival of organisms, the cells of which have the ability to protect DNA against endogenous and environmental agents, including reactive oxygen species (ROS), ionizing radiation, and various chemical compounds. The basis of protection mechanisms has been evolutionarily conserved from yeast to humans; however, each organism often has a specialized mode of regulation that uses different sets of machineries, particularly in lower eukaryotes. The divergence of molecular mechanisms among related organisms has provided insights into the evolution of cellular machineries to a higher architecture. Uncommon characteristics of machineries may also contribute to the development of new applications such as drugs with novel mechanisms of action. In contrast to the cellular properties for maintaining genetic information, living organisms, particularly microbes, inevitably undergo genetic alterations in order to adapt to environmental conditions. The maintenance and alteration of genetic information may be inextricably linked to each other. In this review, we describe recent findings on the unconventional molecular mechanisms of DNA damage response and DNA double-strand break (DSB) repair in the budding yeast Saccharomyces cerevisiae. We also introduce our previous research on genetic and phenotypic instabilities observed in a clonal population of clinically-derived S. cerevisiae. The molecular mechanisms of this case were associated with mutations to generate tyrosine-inserting tRNA-Tyr ochre suppressors and the position effects of mutation frequencies among eight tRNA-Tyr loci dispersed in the genome. Phenotypic variations among different strain backgrounds have also been observed by another type of nonsense suppressor, the aberrant form of the translation termination factor. Nonsense suppressors are considered to be responsible for the genome-wide translational readthrough of termination codons, including natural nonsense codons. The nonsense suppressor-mediated acquisition of phenotypic variations may be advantageous for adaptation to environmental conditions and survival during evolution.
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Affiliation(s)
- Sayoko Ito-Harashima
- Department of Biological Sciences, Graduate School of Science, Osaka Prefecture University, 1-2 Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8570 Japan
| | - Takashi Yagi
- Department of Biological Sciences, Graduate School of Science, Osaka Prefecture University, 1-2 Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8570 Japan
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60
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Bai H, Wu M, Zhang H, Tang G. Chronic polycyclic aromatic hydrocarbon exposure causes DNA damage and genomic instability in lung epithelial cells. Oncotarget 2017; 8:79034-79045. [PMID: 29108285 PMCID: PMC5668018 DOI: 10.18632/oncotarget.20891] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Accepted: 08/26/2017] [Indexed: 11/25/2022] Open
Abstract
Cell exposure to atmospheric polycyclic aromatic hydrocarbons (PAHs) is closely associated with DNA damage and genomic instability. We assessed the mechanisms of chronic and acute PAH exposure-induced genotoxicity in two human lung epithelial cell lines, A549 and NC-H1975. We sampled atmospheric PAHs at the Xixi Campus, Zhejiang University in Hangzhou, China during August (non-haze episode) and November (haze episode) 2015. We identified vehicle emissions as a dominant anthropogenic PAH source in our study. PAHs were extracted according to the United States Environmental Protection Agency Method TO-13A. We found that chronic PAH exposure saturated lung cell xenobiotic metabolic pathways, promoting intercellular reactive oxygen species production and accumulation. Chronic alteration of the cellular redox status resulted in DNA damage and genomic instability. Chronic PAH exposure also perturbed the cellular DNA damage response, inducing S phase arrest and inhibiting apoptosis. Dysregulation of PAH metabolism and the DNA damage response altered cellular homeostasis and increased cell susceptibility to subsequent PAH exposures, thereby enhancing the likelihood of genomic mutation and instability.
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Affiliation(s)
- Hongzhen Bai
- State Key Laboratory of Industrial Control Technology, College of Control Science and Engineering, Zhejiang University, Hangzhou 310028, China.,Institute of Chemical Biology and Pharmaceutical Chemistry, Zhejiang University, Hangzhou 310028, China
| | - Min Wu
- Institute of Chemical Biology and Pharmaceutical Chemistry, Zhejiang University, Hangzhou 310028, China
| | - Hongjian Zhang
- State Key Laboratory of Industrial Control Technology, College of Control Science and Engineering, Zhejiang University, Hangzhou 310028, China
| | - Guping Tang
- Institute of Chemical Biology and Pharmaceutical Chemistry, Zhejiang University, Hangzhou 310028, China
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Rho inhibition by lovastatin affects apoptosis and DSB repair of primary human lung cells in vitro and lung tissue in vivo following fractionated irradiation. Cell Death Dis 2017; 8:e2978. [PMID: 28796249 PMCID: PMC5596560 DOI: 10.1038/cddis.2017.372] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Revised: 06/22/2017] [Accepted: 07/02/2017] [Indexed: 12/12/2022]
Abstract
Thoracic radiotherapy causes damage of normal lung tissue, which limits the cumulative radiation dose and, hence, confines the anticancer efficacy of radiotherapy and impacts the quality of life of tumor patients. Ras-homologous (Rho) small GTPases regulate multiple stress responses and cell death. Therefore, we investigated whether pharmacological targeting of Rho signaling by the HMG-CoA-reductase inhibitor lovastatin influences ionizing radiation (IR)-induced toxicity in primary human lung fibroblasts, lung epithelial and lung microvascular endothelial cells in vitro and subchronic mouse lung tissue damage following hypo-fractionated irradiation (4x4 Gy). The statin improved the repair of radiation-induced DNA double-strand breaks (DSBs) in all cell types and, moreover, protected lung endothelial cells from IR-induced caspase-dependent apoptosis, likely involving p53-regulated mechanisms. Under the in vivo situation, treatment with lovastatin or the Rac1-specific small molecule inhibitor EHT1864 attenuated the IR-induced increase in breathing frequency and reduced the percentage of γH2AX and 53BP1-positive cells. This indicates that inhibition of Rac1 signaling lowers IR-induced residual DNA damage by promoting DNA repair. Moreover, lovastatin and EHT1864 protected lung tissue from IR-triggered apoptosis and mitigated the IR-stimulated increase in regenerative proliferation. Our data document beneficial anti-apoptotic and genoprotective effects of pharmacological targeting of Rho signaling following hypo-fractionated irradiation of lung cells in vitro and in vivo. Rac1-targeting drugs might be particular useful for supportive care in radiation oncology and, moreover, applicable to improve the anticancer efficacy of radiotherapy by widening the therapeutic window of thoracic radiation exposure.
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Klemm T, Mannuß A, Kobbe D, Knoll A, Trapp O, Dorn A, Puchta H. The DNA translocase RAD5A acts independently of the other main DNA repair pathways, and requires both its ATPase and RING domain for activity in Arabidopsis thaliana. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2017; 91:725-740. [PMID: 28509359 DOI: 10.1111/tpj.13602] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2017] [Revised: 04/27/2017] [Accepted: 05/09/2017] [Indexed: 06/07/2023]
Abstract
Multiple pathways exist to repair DNA damage induced by methylating and crosslinking agents in Arabidopsis thaliana. The SWI2/SNF2 translocase RAD5A, the functional homolog of budding yeast Rad5 that is required for the error-free branch of post-replicative repair, plays a surprisingly prominent role in the repair of both kinds of lesions in Arabidopsis. Here we show that both the ATPase domain and the ubiquitination function of the RING domain of the Arabidopsis protein are essential for the cellular response to different forms of DNA damage. To define the exact role of RAD5A within the complex network of DNA repair pathways, we crossed the rad5a mutant line with mutants of different known repair factors of Arabidopsis. We had previously shown that RAD5A acts independently of two main pathways of replication-associated DNA repair defined by the helicase RECQ4A and the endonuclease MUS81. The enhanced sensitivity of all double mutants tested in this study indicates that the repair of damaged DNA by RAD5A also occurs independently of nucleotide excision repair (AtRAD1), single-strand break repair (AtPARP1), as well as microhomology-mediated double-strand break repair (AtTEB). Moreover, RAD5A can partially complement for a deficient AtATM-mediated DNA damage response in plants, as the double mutant shows phenotypic growth defects.
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Affiliation(s)
- Tobias Klemm
- Botanical Institute, Karlsruhe Institute of Technology, Kaiserstr. 12, 76131, Karlsruhe, Germany
| | | | - Daniela Kobbe
- Botanical Institute, Karlsruhe Institute of Technology, Kaiserstr. 12, 76131, Karlsruhe, Germany
| | - Alexander Knoll
- Botanical Institute, Karlsruhe Institute of Technology, Kaiserstr. 12, 76131, Karlsruhe, Germany
| | | | - Annika Dorn
- Botanical Institute, Karlsruhe Institute of Technology, Kaiserstr. 12, 76131, Karlsruhe, Germany
| | - Holger Puchta
- Botanical Institute, Karlsruhe Institute of Technology, Kaiserstr. 12, 76131, Karlsruhe, Germany
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Liu Z, Li G, Gou Y, Xiao D, Luo G, Saavedra JE, Liu J, Wang H. JS-K, a nitric oxide prodrug, induces DNA damage and apoptosis in HBV-positive hepatocellular carcinoma HepG2.2.15 cell. Biomed Pharmacother 2017; 92:989-997. [PMID: 28605880 DOI: 10.1016/j.biopha.2017.05.141] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Revised: 05/29/2017] [Accepted: 05/30/2017] [Indexed: 11/24/2022] Open
Abstract
Hepatocellular carcinoma (HCC) is the most important cause of cancer-related death, and 85% of HCC is caused by chronic HBV infection, the prognosis of patients and the reduction of HBV DNA levels remain unsatisfactory. JS-K, a nitric oxide-releasing diazeniumdiolates, is effective against various tumors, but little is known on its effects on HBV positive HCC. We found that JS-K reduced the expression of HBsAg and HBeAg in HBV-positive HepG2.2.15 cells. This study aimed to further examine anti-tumor effects of JS-K on HepG2.2.15 cells. The MTT assay and colony forming assay were used to study the cell growth inhibition of JS-K; scratch assay and transwell assay were performed to detect cell migration. The cell cycle was detected by flow cytometry. The immunofluorescence, flow cytometry analysis, and western blot were used to study DNA damage and cell apoptosis. JS-K inhibited HepG2.2.15 cell growth in a dose-dependent manner, suppressed cell colony formation and migration, arrested cells gather in the G2 phase. JS-K (1-20μM) increased the expression of DNA damage-associated protein phosphorylation H2AX (γH2AX), phosphorylation of checkpoint kinase 1 (p-Chk1), phosphorylation of checkpoint kinase 2 (p-Chk2), ataxia-telangiectasia mutated (ATM), phosphorylation of ataxia-telangiectasia mutated rad3-related (p-ATR) and apoptotic-associated proteins cleaved caspase-3, cleaved caspase-7, cleaved poly ADP-ribose polymerase (cleaved PARP). The study demonstrated JS-K is effective against HBV-positive HepG2.2.15 cells, the mechanisms are not only related to inhibition of HBsAg and HBeAg secretion, but also related with induction of DNA damage and apoptosis. JS-K is a promising anti-cancer candidate against HBV-positive HCC.
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Affiliation(s)
- Zhengyun Liu
- Key Laboratory of infectious disease, Provincial Department of Education, Zunyi Medical College Guizhou, 563000 China; Research Center for Medicine and Biology, Zunyi Medical College, Guizhou, 563000 China; Key Lab for Basic Pharmacology of Ministry of Education, Zunyi Medical College, Guizhou, 563000 China
| | - Guangmin Li
- Department of emergency, Affiliated Hospital of Zunyi Medical College, China
| | - Ying Gou
- Key Laboratory of infectious disease, Provincial Department of Education, Zunyi Medical College Guizhou, 563000 China; Research Center for Medicine and Biology, Zunyi Medical College, Guizhou, 563000 China; Department of Microbiology, Zunyi Medical College, Guizhou, 563000 China
| | - Dongyan Xiao
- Key Laboratory of infectious disease, Provincial Department of Education, Zunyi Medical College Guizhou, 563000 China; Research Center for Medicine and Biology, Zunyi Medical College, Guizhou, 563000 China; Department of Microbiology, Zunyi Medical College, Guizhou, 563000 China
| | - Guo Luo
- Key Laboratory of infectious disease, Provincial Department of Education, Zunyi Medical College Guizhou, 563000 China; Research Center for Medicine and Biology, Zunyi Medical College, Guizhou, 563000 China
| | | | - Jie Liu
- Key Lab for Basic Pharmacology of Ministry of Education, Zunyi Medical College, Guizhou, 563000 China
| | - Huan Wang
- Key Laboratory of infectious disease, Provincial Department of Education, Zunyi Medical College Guizhou, 563000 China; Research Center for Medicine and Biology, Zunyi Medical College, Guizhou, 563000 China; Department of Microbiology, Zunyi Medical College, Guizhou, 563000 China.
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64
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Sagawa M, Ohguchi H, Harada T, Samur MK, Tai YT, Munshi NC, Kizaki M, Hideshima T, Anderson KC. Ribonucleotide Reductase Catalytic Subunit M1 (RRM1) as a Novel Therapeutic Target in Multiple Myeloma. Clin Cancer Res 2017; 23:5225-5237. [PMID: 28442502 DOI: 10.1158/1078-0432.ccr-17-0263] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2017] [Revised: 03/17/2017] [Accepted: 04/18/2017] [Indexed: 11/16/2022]
Abstract
Purpose: To investigate the biological and clinical significance of ribonucleotide reductase (RR) in multiple myeloma.Experimental Design: We assessed the impact of RR expression on patient outcome in multiple myeloma. We then characterized the effect of genetic and pharmacologic inhibition of ribonucleotide reductase catalytic subunit M1 (RRM1) on multiple myeloma growth and survival using siRNA and clofarabine, respectively, in both in vitro and in vivo mouse xenograft models.Results: Newly diagnosed multiple myeloma patients with higher RRM1 expression have shortened survival. Knockdown of RRM1 triggered significant growth inhibition and apoptosis in multiple myeloma cells, even in the context of the bone marrow microenvironment. Gene expression profiling showed upregulation of DNA damage response genes and p53-regulated genes after RRM1 knockdown. Immunoblot and qRT-PCR analysis confirmed that γ-H2A.X, ATM, ATR, Chk1, Chk2, RAD51, 53BP1, BRCA1, and BRCA2 were upregulated/activated. Moreover, immunoblots showed that p53, p21, Noxa, and Puma were activated in p53 wild-type multiple myeloma cells. Clofarabine, a purine nucleoside analogue that inhibits RRM1, induced growth arrest and apoptosis in p53 wild-type cell lines. Although clofarabine did not induce cell death in p53-mutant cells, it did trigger synergistic toxicity in combination with DNA-damaging agent melphalan. Finally, we demonstrated that tumor growth of RRM1-knockdown multiple myeloma cells was significantly reduced in a murine human multiple myeloma cell xenograft model.Conclusions: Our results therefore demonstrate that RRM1 is a novel therapeutic target in multiple myeloma in the preclinical setting and provide the basis for clinical evaluation of RRM1 inhibitor, alone or in combination with DNA-damaging agents, to improve patient outcome in multiple myeloma. Clin Cancer Res; 23(17); 5225-37. ©2017 AACR.
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Affiliation(s)
- Morihiko Sagawa
- Jerome Lipper Multiple Myeloma Center, Department of Medical Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts.,Department of Hematology, Saitama Medical Center, Saitama Medical University, Kawagoe, Saitama, Japan
| | - Hiroto Ohguchi
- Jerome Lipper Multiple Myeloma Center, Department of Medical Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts
| | - Takeshi Harada
- Jerome Lipper Multiple Myeloma Center, Department of Medical Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts
| | - Mehmet K Samur
- Department of Biostatistics and Computational Biology, Dana-Farber Cancer Institute and Harvard School of Public Health, Boston, Massachusetts
| | - Yu-Tzu Tai
- Jerome Lipper Multiple Myeloma Center, Department of Medical Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts
| | - Nikhil C Munshi
- Jerome Lipper Multiple Myeloma Center, Department of Medical Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts.,West Roxbury Division, VA Boston Healthcare System, West Roxbury, Massachusetts
| | - Masahiro Kizaki
- Department of Hematology, Saitama Medical Center, Saitama Medical University, Kawagoe, Saitama, Japan
| | - Teru Hideshima
- Jerome Lipper Multiple Myeloma Center, Department of Medical Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts
| | - Kenneth C Anderson
- Jerome Lipper Multiple Myeloma Center, Department of Medical Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts.
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DNA damage-dependent mechanisms of ageing and disease in the macro- and microvasculature. Eur J Pharmacol 2017; 816:116-128. [PMID: 28347738 DOI: 10.1016/j.ejphar.2017.03.050] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Revised: 03/07/2017] [Accepted: 03/23/2017] [Indexed: 12/15/2022]
Abstract
A decline in the function of the macro- and micro-vasculature occurs with ageing. DNA damage also accumulates with ageing, and thus DNA damage and repair have important roles in physiological ageing. Considerable evidence also supports a crucial role for DNA damage in the development and progression of macrovascular disease such as atherosclerosis. These findings support the concept that prolonged exposure to risk factors is a major stimulus for DNA damage within the vasculature, in part via the generation of reactive oxygen species. Genomic instability can directly affect vascular cellular function, leading to cell cycle arrest, apoptosis and premature vascular cell senescence. In contrast, the study of age-related impaired function and DNA damage mechanisms in the microvasculature is limited, although ageing is associated with microvessel endothelial dysfunction. This review examines current knowledge on the role of DNA damage and DNA repair systems in macrovascular disease such as atherosclerosis and microvascular disease. We also discuss the cellular responses to DNA damage to identify possible strategies for prevention and treatment.
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66
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The Intra-S Checkpoint Responses to DNA Damage. Genes (Basel) 2017; 8:genes8020074. [PMID: 28218681 PMCID: PMC5333063 DOI: 10.3390/genes8020074] [Citation(s) in RCA: 69] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2017] [Revised: 02/08/2017] [Accepted: 02/08/2017] [Indexed: 02/03/2023] Open
Abstract
Faithful duplication of the genome is a challenge because DNA is susceptible to damage by a number of intrinsic and extrinsic genotoxins, such as free radicals and UV light. Cells activate the intra-S checkpoint in response to damage during S phase to protect genomic integrity and ensure replication fidelity. The checkpoint prevents genomic instability mainly by regulating origin firing, fork progression, and transcription of G1/S genes in response to DNA damage. Several studies hint that regulation of forks is perhaps the most critical function of the intra-S checkpoint. However, the exact role of the checkpoint at replication forks has remained elusive and controversial. Is the checkpoint required for fork stability, or fork restart, or to prevent fork reversal or fork collapse, or activate repair at replication forks? What are the factors that the checkpoint targets at stalled replication forks? In this review, we will discuss the various pathways activated by the intra-S checkpoint in response to damage to prevent genomic instability.
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Hazan I, Hofmann TG, Aqeilan RI. Tumor Suppressor Genes within Common Fragile Sites Are Active Players in the DNA Damage Response. PLoS Genet 2016; 12:e1006436. [PMID: 27977694 PMCID: PMC5157955 DOI: 10.1371/journal.pgen.1006436] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
The role of common fragile sites (CFSs) in cancer remains controversial. Two main views dominate the discussion: one suggests that CFS loci are hotspots of genomic instability leading to inactivation of genes encoded within them, while the other view proposes that CFSs are functional units and that loss of the encoded genes confers selective pressure, leading to cancer development. The latter view is supported by emerging evidence showing that expression of a given CFS is associated with genome integrity and that inactivation of CFS-resident tumor suppressor genes leads to dysregulation of the DNA damage response (DDR) and increased genomic instability. These two viewpoints of CFS function are not mutually exclusive but rather coexist; when breaks at CFSs are not repaired accurately, this can lead to deletions by which cells acquire growth advantage because of loss of tumor suppressor activities. Here, we review recent advances linking some CFS gene products with the DDR, genomic instability, and carcinogenesis and discuss how their inactivation might represent a selective advantage for cancer cells.
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Affiliation(s)
- Idit Hazan
- Lautenberg Center for Immunology and Cancer Research, IMRIC, Hebrew University-Hadassah Medical School, Jerusalem, Israel
| | - Thomas G. Hofmann
- Cellular Senescence Group, Department of Epigenetics, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Rami I. Aqeilan
- Lautenberg Center for Immunology and Cancer Research, IMRIC, Hebrew University-Hadassah Medical School, Jerusalem, Israel
- Department of Cancer Biology and Genetics, The Ohio State University Wexner Medical Center, Columbus, Ohio, United States of America
- Department of Biochemistry, University of Vermont College of Medicine, Burlington, Vermont, United States of America
- * E-mail:
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68
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Ahmed M, Li L, Pinnix C, Dabaja B, Nomie K, Lam L, Wang M. ATM mutation and radiosensitivity: An opportunity in the therapy of mantle cell lymphoma. Crit Rev Oncol Hematol 2016; 107:14-19. [DOI: 10.1016/j.critrevonc.2016.08.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2016] [Revised: 07/12/2016] [Accepted: 08/18/2016] [Indexed: 12/11/2022] Open
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Budden T, Davey RJ, Vilain RE, Ashton KA, Braye SG, Beveridge NJ, Bowden NA. Repair of UVB-induced DNA damage is reduced in melanoma due to low XPC and global genome repair. Oncotarget 2016; 7:60940-60953. [PMID: 27487145 PMCID: PMC5308628 DOI: 10.18632/oncotarget.10902] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2016] [Accepted: 07/14/2016] [Indexed: 11/25/2022] Open
Abstract
UVB exposure leads to DNA damage, which when unrepaired induces C>T transitions. These mutations are found throughout the melanoma genome, particularly in non-transcribed regions. The global genome repair (GGR) branch of nucleotide excision repair (NER) is responsible for repairing UV-induced DNA damage across non-transcribed and silent regions of the genome. This study aimed to examine the relationship between UVB and GGR in melanoma. DNA repair capacity and relative expression of NER in melanocytes and melanoma cell lines before and after treatment with UVB was quantified. Transcript expression from 196 melanomas was compared to clinical parameters including solar elastosis and whole transcriptome data collected. Melanoma cell lines showed significantly reduced DNA repair when compared to melanocytes, most significantly in the S phase of the cell cycle. Expression of GGR components XPC, DDB1 and DDB2 was significantly lower in melanoma after UVB. In the melanoma tumours, XPC expression correlated with age of diagnosis and low XPC conferred significantly poorer survival. The same trend was seen in the TCGA melanoma dataset. Reduced GGR in melanoma may contribute to the UV mutation spectrum of the melanoma genome and adds further to the growing evidence of the link between UV, NER and melanoma.
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Affiliation(s)
- Timothy Budden
- Hunter Medical Research Institute and Faculty of Health, University of Newcastle, Callaghan, NSW, Australia
| | - Ryan J. Davey
- Hunter Medical Research Institute and Faculty of Health, University of Newcastle, Callaghan, NSW, Australia
| | - Ricardo E. Vilain
- Hunter Medical Research Institute and Faculty of Health, University of Newcastle, Callaghan, NSW, Australia
- Melanoma Institute of Australia, Camperdown, NSW, Australia
- Sydney Medical School, University of Sydney, Sydney, NSW, Australia
- Hunter Area Pathology Service, Pathology North, John Hunter Hospital, Newcastle, NSW, Australia
| | - Katie A. Ashton
- Hunter Medical Research Institute and Faculty of Health, University of Newcastle, Callaghan, NSW, Australia
| | - Stephen G. Braye
- Hunter Area Pathology Service, Pathology North, John Hunter Hospital, Newcastle, NSW, Australia
| | - Natalie J. Beveridge
- Hunter Medical Research Institute and Faculty of Health, University of Newcastle, Callaghan, NSW, Australia
| | - Nikola A. Bowden
- Hunter Medical Research Institute and Faculty of Health, University of Newcastle, Callaghan, NSW, Australia
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Exploring Splicing-Switching Molecules For Seckel Syndrome Therapy. Biochim Biophys Acta Mol Basis Dis 2016; 1863:15-20. [PMID: 27639833 DOI: 10.1016/j.bbadis.2016.09.011] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Revised: 09/05/2016] [Accepted: 09/13/2016] [Indexed: 12/31/2022]
Abstract
The c.2101A>G synonymous change (p.G674G) in the gene for ATR, a key player in the DNA-damage response, has been the first identified genetic cause of Seckel Syndrome (SS), an orphan disease characterized by growth and mental retardation. This mutation mainly causes exon 9 skipping, through an ill-defined mechanism. Through ATR minigene expression studies, we demonstrated that the detrimental effect of this mutation (6±1% of correct transcripts only) depends on the poor exon 9 definition (47±4% in the ATRwt context), because the change was ineffective when the weak 5' or the 3' splice sites (ss) were strengthened (scores from 0.54 to 1) by mutagenesis. Interestingly, the exonic c.2101A nucleotide is conserved across species, and the SS-causing mutation is predicted to concurrently strengthen a Splicing Silencer (ESS) and weaken a Splicing Enhancer (ESE). Consistently, the artificial c.2101A>C change, predicted to weaken the ESE only, moderately impaired exon inclusion (28±7% of correct transcripts). The observation that an antisense oligonucleotide (AONATR) targeting the c.2101A position recovers exon inclusion in the mutated context supports a major role of the underlying ESS. A U1snRNA variant (U1ATR) designed to perfectly base-pair the weak 5'ss, rescued exon inclusion (63±3%) in the ATRSS-allele. Most importantly, upon lentivirus-mediated delivery, the U1ATR partially rescued ATR mRNA splicing (from ~19% to ~54%) and protein (from negligible to ~6%) in embryonic fibroblasts derived from humanized ATRSS mice. Altogether these data elucidate the molecular mechanisms of the ATR c.2101A>G mutation and identify two potential complementary RNA-based therapies for Seckel syndrome.
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71
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Ray A, Blevins C, Wani G, Wani AA. ATR- and ATM-Mediated DNA Damage Response Is Dependent on Excision Repair Assembly during G1 but Not in S Phase of Cell Cycle. PLoS One 2016; 11:e0159344. [PMID: 27442013 PMCID: PMC4956099 DOI: 10.1371/journal.pone.0159344] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Accepted: 06/30/2016] [Indexed: 11/18/2022] Open
Abstract
Cell cycle checkpoint is mediated by ATR and ATM kinases, as a prompt early response to a variety of DNA insults, and culminates in a highly orchestrated signal transduction cascade. Previously, we defined the regulatory role of nucleotide excision repair (NER) factors, DDB2 and XPC, in checkpoint and ATR/ATM-dependent repair pathway via ATR and ATM phosphorylation and recruitment to ultraviolet radiation (UVR)-induced damage sites. Here, we have dissected the molecular mechanisms of DDB2- and XPC- mediated regulation of ATR and ATM recruitment and activation upon UVR exposures. We show that the ATR and ATM activation and accumulation to UVR-induced damage not only depends on DDB2 and XPC, but also on the NER protein XPA, suggesting that the assembly of an active NER complex is essential for ATR and ATM recruitment. ATR and ATM localization and H2AX phosphorylation at the lesion sites occur as early as ten minutes in asynchronous as well as G1 arrested cells, showing that repair and checkpoint-mediated by ATR and ATM starts early upon UV irradiation. Moreover, our results demonstrated that ATR and ATM recruitment and H2AX phosphorylation are dependent on NER proteins in G1 phase, but not in S phase. We reasoned that in G1 the UVR-induced ssDNA gaps or processed ssDNA, and the bound NER complex promote ATR and ATM recruitment. In S phase, when the UV lesions result in stalled replication forks with long single-stranded DNA, ATR and ATM recruitment to these sites is regulated by different sets of proteins. Taken together, these results provide evidence that UVR-induced ATR and ATM recruitment and activation differ in G1 and S phases due to the existence of distinct types of DNA lesions, which promote assembly of different proteins involved in the process of DNA repair and checkpoint activation.
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Affiliation(s)
- Alo Ray
- Department of Radiology, The Ohio State University, Columbus, Ohio, 43210, United States of America
| | - Chessica Blevins
- Department of Radiology, The Ohio State University, Columbus, Ohio, 43210, United States of America
| | - Gulzar Wani
- Department of Radiology, The Ohio State University, Columbus, Ohio, 43210, United States of America
| | - Altaf A Wani
- Department of Radiology, Department of Molecular and Cellular Biochemistry, James Cancer Hospital and Solove Research Institute, The Ohio State University, Columbus, Ohio, 43210, United States of America
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Jones M, Bisht K, Savage SA, Nandakumar J, Keegan CE, Maillard I. The shelterin complex and hematopoiesis. J Clin Invest 2016; 126:1621-9. [PMID: 27135879 DOI: 10.1172/jci84547] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Mammalian chromosomes terminate in stretches of repetitive telomeric DNA that act as buffers to avoid loss of essential genetic information during end-replication. A multiprotein complex known as shelterin prevents recognition of telomeric sequences as sites of DNA damage. Telomere erosion contributes to human diseases ranging from BM failure to premature aging syndromes and cancer. The role of shelterin telomere protection is less understood. Mutations in genes encoding the shelterin proteins TRF1-interacting nuclear factor 2 (TIN2) and adrenocortical dysplasia homolog (ACD) were identified in dyskeratosis congenita, a syndrome characterized by somatic stem cell dysfunction in multiple organs leading to BM failure and other pleiotropic manifestations. Here, we introduce the biochemical features and in vivo effects of individual shelterin proteins, discuss shelterin functions in hematopoiesis, and review emerging knowledge implicating the shelterin complex in hematological disorders.
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Salzman DW, Nakamura K, Nallur S, Dookwah MT, Metheetrairut C, Slack FJ, Weidhaas JB. miR-34 activity is modulated through 5'-end phosphorylation in response to DNA damage. Nat Commun 2016; 7:10954. [PMID: 26996824 PMCID: PMC4802117 DOI: 10.1038/ncomms10954] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Accepted: 02/04/2016] [Indexed: 01/07/2023] Open
Abstract
MicroRNA (miRNA) expression is tightly regulated by several mechanisms, including transcription and cleavage of the miRNA precursor RNAs, to generate a mature miRNA, which is thought to be directly correlated with activity. MiR-34 is a tumour-suppressor miRNA important in cell survival, that is transcriptionally upregulated by p53 in response to DNA damage. Here, we show for the first time that there is a pool of mature miR-34 in cells that lacks a 5′-phosphate and is inactive. Following exposure to a DNA-damaging stimulus, the inactive pool of miR-34 is rapidly activated through 5′-end phosphorylation in an ATM- and Clp1-dependent manner, enabling loading into Ago2. Importantly, this mechanism of miR-34 activation occurs faster than, and independently of, de novo p53-mediated transcription and processing. Our study reveals a novel mechanism of rapid miRNA activation in response to environmental stimuli occurring at the mature miRNA level. MiR-34 is a tumour suppressor microRNA known to be upregulated by p53 after DNA damage and plays a critical role in cell cycle arrest and apoptosis. Here the authors show the cell maintains an inactive pool of miR-34 which is rapidly activated after damage via ATM-dependent phosphorylation.
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Affiliation(s)
- David W Salzman
- Department of Therapeutic Radiology, Yale School of Medicine, 15 York Street, New Haven, Connecticut 06502, USA
| | - Kotoka Nakamura
- Department of Radiation Oncology, David Geffen School of Medicine, Los Angeles, California 90024, USA
| | - Sunitha Nallur
- Department of Therapeutic Radiology, Yale School of Medicine, 15 York Street, New Haven, Connecticut 06502, USA
| | - Michelle T Dookwah
- Department of Therapeutic Radiology, Yale School of Medicine, 15 York Street, New Haven, Connecticut 06502, USA
| | - Chanatip Metheetrairut
- Department of Molecular, Cellular and Developmental Biology, Yale University, PO Box 208103, New Haven, Connecticut 06502, USA
| | - Frank J Slack
- Department of Molecular, Cellular and Developmental Biology, Yale University, PO Box 208103, New Haven, Connecticut 06502, USA.,Department of Pathology, Beth Israel Deaconess Medical Center, Institute for RNA Medicine, Harvard Medical School, 330 Brookline Avenue, Boston, Massachusetts 02215, USA
| | - Joanne B Weidhaas
- Department of Radiation Oncology, David Geffen School of Medicine, Los Angeles, California 90024, USA
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Zhang R, Zhu L, Zhang L, Xu A, Li Z, Xu Y, He P, Wu M, Wei F, Wang C. PTEN enhances G2/M arrest in etoposide-treated MCF‑7 cells through activation of the ATM pathway. Oncol Rep 2016; 35:2707-14. [PMID: 26986476 DOI: 10.3892/or.2016.4674] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2015] [Accepted: 12/27/2015] [Indexed: 11/06/2022] Open
Abstract
As an effective tumor suppressor, phosphatase and tensin homolog (PTEN) has attracted the increased attention of scientists. Recent studies have shown that PTEN plays unique roles in the DNA damage response (DDR) and can interact with the Chk1 pathway. However, little is known about how PTEN contributes to DDR through the ATM-Chk2 pathway. It is well-known that etoposide induces G2/M arrest in a variety of cell lines, including MCF-7 cells. The DNA damage-induced G2/M arrest results from the activation of protein kinase ataxia telangiectasia mutated (ATM), followed by the activation of Chk2 that subsequently inactivates CDC25C, resulting in G2/M arrest. In the present study, we assessed the contribution of PTEN to the etoposide-induced G2/M cell cycle arrest. PTEN was knocked down in MCF-7 cells by specific shRNA, and the effects of PTEN on the ATM-Chk2 pathway were investigated through various approaches. The results showed that knockdown of PTEN strongly antagonized ATM activation in response to etoposide treatment, and thereby reduced the phosphorylation level of ATM substrates, including H2AX, P53 and Chk2. Furthermore, depletion of PTEN reduced the etoposide-induced phosphorylation of CDC25C and strikingly compromised etoposide-induced G2/M arrest in the MCF-7 cells. Altogether, we demonstrated that PTEN plays a unique role in etoposide-induced G2/M arrest by facilitating the activation of the ATM pathway, and PTEN was required for the proper activation of checkpoints in response to DNA damage in MCF-7 cells.
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Affiliation(s)
- Ruopeng Zhang
- Department of Obstetrics and Gynecology, Shenzhen Maternity and Child Healthcare Hospital, Affiliated to Southern Medical University, Longgang, Shenzhen, Guangdong 518028, P.R. China
| | - Li Zhu
- Department of Reproductive Medicine, Affiliated Hospital of Dali University, Dali, Yunnan 671000, P.R. China
| | - Lirong Zhang
- Department of Reproductive Medicine, Affiliated Hospital of Dali University, Dali, Yunnan 671000, P.R. China
| | - Anli Xu
- Department of Reproductive Medicine, Affiliated Hospital of Dali University, Dali, Yunnan 671000, P.R. China
| | - Zhengwei Li
- Clinical Medicine College of Dali University, Dali, Yunnan 671000, P.R. China
| | - Yijuan Xu
- Clinical Medicine College of Dali University, Dali, Yunnan 671000, P.R. China
| | - Pei He
- Clinical Medicine College of Dali University, Dali, Yunnan 671000, P.R. China
| | - Maoqing Wu
- Renal Division, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Fengxiang Wei
- The Genetics Laboratory, Shenzhen Longgang District Maternity and Child Healthcare Hospital, Longgang, Shenzhen, Guangdong 518028, P.R. China
| | - Chenhong Wang
- Department of Obstetrics and Gynecology, Shenzhen Maternity and Child Healthcare Hospital, Affiliated to Southern Medical University, Longgang, Shenzhen, Guangdong 518028, P.R. China
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Ziegler V, Albers A, Fritz G. Lovastatin protects keratinocytes from DNA damage-related pro-apoptotic stress responses stimulated by anticancer therapeutics. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2016; 1863:1082-92. [PMID: 26876155 DOI: 10.1016/j.bbamcr.2016.02.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Revised: 01/29/2016] [Accepted: 02/10/2016] [Indexed: 01/14/2023]
Abstract
BACKGROUND Oral mucositis (OM) is a relevant adverse effect of anticancer therapy involving ionizing radiation (IR) and doxorubicin (Doxo). Because DNA damage of keratinocytes is causative for the pathogenesis of OM, we aim to identify pharmacological measures for geno- and cytoprotection of keratinocytes. METHODS We investigated the influence of the lipid-lowering drug lovastatin on cell death, proliferation and DNA damage response (DDR) mechanisms of human keratinocytes following treatment with IR and Doxo. RESULTS Lovastatin protected keratinocytes from the cytotoxic and genotoxic effects of IR and Doxo as shown by a diminished induction of apoptosis as well as a reduced formation and slightly improved repair of DNA damage following Doxo and IR treatment, respectively. Lovastatin selectively blocked the activation of Chk1 and ATR kinases following treatment with IR, Doxo and the ribonucleotide reductase inhibitor hydroxyurea, indicating that the statin antagonizes ATR/Chk1-regulated replicative stress responses. Part of the cytoprotective activity of lovastatin seems to rest on a delayed entry of lovastatin treated cells into S-phase. Yet, because the statin also protected non-proliferating keratinocytes from IR- and Doxo-induced cytotoxicity, cell cycle independent protective mechanisms are involved, too. CONCLUSIONS Lovastatin attenuates pro-toxic DNA damage-related responses of keratinocytes stimulated by OM-inducing anticancer therapeutics. The data encourage forthcoming in vivo and clinical studies addressing the usefulness of statins in the prevention of OM.
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Affiliation(s)
- Verena Ziegler
- Institute of Toxicology, Medical Faculty of the Heinrich Heine University Düsseldorf, Moorenstrasse 5, D-40225 Düsseldorf, Germany
| | - Anne Albers
- Institute of Toxicology, Medical Faculty of the Heinrich Heine University Düsseldorf, Moorenstrasse 5, D-40225 Düsseldorf, Germany
| | - Gerhard Fritz
- Institute of Toxicology, Medical Faculty of the Heinrich Heine University Düsseldorf, Moorenstrasse 5, D-40225 Düsseldorf, Germany.
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Tatewaki N, Konishi T, Nakajima Y, Nishida M, Saito M, Eitsuka T, Sakamaki T, Ikekawa N, Nishida H. Squalene Inhibits ATM-Dependent Signaling in γIR-Induced DNA Damage Response through Induction of Wip1 Phosphatase. PLoS One 2016; 11:e0147570. [PMID: 26824362 PMCID: PMC4732816 DOI: 10.1371/journal.pone.0147570] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Accepted: 01/05/2016] [Indexed: 01/10/2023] Open
Abstract
Ataxia telangiectasia mutated (ATM) kinase plays a crucial role as a master controller in the cellular DNA damage response. Inhibition of ATM leads to inhibition of the checkpoint signaling pathway. Hence, addition of checkpoint inhibitors to anticancer therapies may be an effective targeting strategy. A recent study reported that Wip1, a protein phosphatase, de-phosphorylates serine 1981 of ATM during the DNA damage response. Squalene has been proposed to complement anticancer therapies such as chemotherapy and radiotherapy; however, there is little mechanistic information supporting this idea. Here, we report the inhibitory effect of squalene on ATM-dependent DNA damage signals. Squalene itself did not affect cell viability and the cell cycle of A549 cells, but it enhanced the cytotoxicity of gamma-irradiation (γIR). The in vitro kinase activity of ATM was not altered by squalene. However, squalene increased Wip1 expression in cells and suppressed ATM activation in γIR-treated cells. Consistent with the potential inhibition of ATM by squalene, IR-induced phosphorylation of ATM effectors such as p53 (Ser15) and Chk1 (Ser317) was inhibited by cell treatment with squalene. Thus, squalene inhibits the ATM-dependent signaling pathway following DNA damage through intracellular induction of Wip1 expression.
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Affiliation(s)
- Naoto Tatewaki
- Department of Applied Life Sciences, Niigata University of Pharmacy and Applied Life Sciences, Niigata, Japan
| | - Tetsuya Konishi
- Department of Applied Life Sciences, Niigata University of Pharmacy and Applied Life Sciences, Niigata, Japan
| | - Yuki Nakajima
- Department of Applied Life Sciences, Niigata University of Pharmacy and Applied Life Sciences, Niigata, Japan
| | - Miyako Nishida
- Department of Applied Life Sciences, Niigata University of Pharmacy and Applied Life Sciences, Niigata, Japan
| | - Masafumi Saito
- Department of Applied Life Sciences, Niigata University of Pharmacy and Applied Life Sciences, Niigata, Japan
| | - Takahiro Eitsuka
- Department of Applied Life Sciences, Niigata University of Pharmacy and Applied Life Sciences, Niigata, Japan
| | - Toshiyuki Sakamaki
- Department of Pharmaceutical Sciences, Niigata University of Pharmacy and Applied Life Sciences, Niigata, Japan
| | | | - Hiroshi Nishida
- Department of Applied Life Sciences, Niigata University of Pharmacy and Applied Life Sciences, Niigata, Japan
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Andrs M, Muthna D, Rezacova M, Seifrtova M, Siman P, Korabecny J, Benek O, Dolezal R, Soukup O, Jun D, Kuca K. Novel caffeine derivatives with antiproliferative activity. RSC Adv 2016. [DOI: 10.1039/c5ra22889a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Beyond the psychoactive and cardiovascular effects of caffeine, this substance is also known for altering the cell's DNA damage response.
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78
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Herraiz C, Calvo F, Pandya P, Cantelli G, Rodriguez-Hernandez I, Orgaz JL, Kang N, Chu T, Sahai E, Sanz-Moreno V. Reactivation of p53 by a Cytoskeletal Sensor to Control the Balance Between DNA Damage and Tumor Dissemination. J Natl Cancer Inst 2016; 108:djv289. [PMID: 26464464 PMCID: PMC4712681 DOI: 10.1093/jnci/djv289] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Revised: 04/22/2015] [Accepted: 09/21/2015] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Abnormal cell migration and invasion underlie metastasis, and actomyosin contractility is a key regulator of tumor invasion. The links between cancer migratory behavior and DNA damage are poorly understood. METHODS Using 3D collagen systems to recapitulate melanoma extracellular matrix, we analyzed the relationship between the actomyosin cytoskeleton of migrating cells and DNA damage. We used multiple melanoma cell lines and microarray analysis to study changes in gene expression and in vivo intravital imaging (n = 7 mice per condition) to understand how DNA damage impacts invasive behavior. We used Protein Tissue Microarrays (n = 164 melanomas) and patient databases (n = 354 melanoma samples) to investigate the associations between markers of DNA damage and actomyosin cytoskeletal features. Data were analyzed with Student's and multiple t tests, Mann-Whitney's test, one-way analysis of variance, and Pearson correlation. All statistical tests were two-sided. RESULTS Melanoma cells with low levels of Rho-ROCK-driven actomyosin are subjected to oxidative stress-dependent DNA damage and ATM-mediated p53 protein stabilization. This results in a specific transcriptional signature enriched in DNA damage/oxidative stress responsive genes, including Tumor Protein p53 Inducible Protein 3 (TP53I3 or PIG3). PIG3, which functions in DNA damage repair, uses an unexpected catalytic mechanism to suppress Rho-ROCK activity and impair tumor invasion in vivo. This regulation was suppressed by antioxidants. Furthermore, PIG3 levels decreased while ROCK1/2 levels increased in human metastatic melanomas (ROCK1 vs PIG3; r = -0.2261, P < .0001; ROCK2 vs PIG3: r = -0.1381, P = .0093). CONCLUSIONS The results suggest using Rho-kinase inhibitors to reactivate the p53-PIG3 axis as a novel therapeutic strategy; we suggest that the use of antioxidants in melanoma should be very carefully evaluated.
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Affiliation(s)
- Cecilia Herraiz
- Tumor Plasticity Laboratory, Randall Division of Cell and Molecular Biophysics, King's College London, London, UK (CH, PP, GC, IRH, JLO, NK, TC, VSM); Tumor Cell Biology Laboratory, Cancer Research UK London Research Institute, London, UK (FC, ES).Current affiliations: Tumor Microenvironment Team, Institute of Cancer Research, Chester Beatty Laboratories, London, UK (FC); Department of Biochemistry and Molecular Biology, School of Medicine, University of Murcia and IMIB-Arrixaca, Murcia, Spain (CH)
| | - Fernando Calvo
- Tumor Plasticity Laboratory, Randall Division of Cell and Molecular Biophysics, King's College London, London, UK (CH, PP, GC, IRH, JLO, NK, TC, VSM); Tumor Cell Biology Laboratory, Cancer Research UK London Research Institute, London, UK (FC, ES).Current affiliations: Tumor Microenvironment Team, Institute of Cancer Research, Chester Beatty Laboratories, London, UK (FC); Department of Biochemistry and Molecular Biology, School of Medicine, University of Murcia and IMIB-Arrixaca, Murcia, Spain (CH)
| | - Pahini Pandya
- Tumor Plasticity Laboratory, Randall Division of Cell and Molecular Biophysics, King's College London, London, UK (CH, PP, GC, IRH, JLO, NK, TC, VSM); Tumor Cell Biology Laboratory, Cancer Research UK London Research Institute, London, UK (FC, ES).Current affiliations: Tumor Microenvironment Team, Institute of Cancer Research, Chester Beatty Laboratories, London, UK (FC); Department of Biochemistry and Molecular Biology, School of Medicine, University of Murcia and IMIB-Arrixaca, Murcia, Spain (CH)
| | - Gaia Cantelli
- Tumor Plasticity Laboratory, Randall Division of Cell and Molecular Biophysics, King's College London, London, UK (CH, PP, GC, IRH, JLO, NK, TC, VSM); Tumor Cell Biology Laboratory, Cancer Research UK London Research Institute, London, UK (FC, ES).Current affiliations: Tumor Microenvironment Team, Institute of Cancer Research, Chester Beatty Laboratories, London, UK (FC); Department of Biochemistry and Molecular Biology, School of Medicine, University of Murcia and IMIB-Arrixaca, Murcia, Spain (CH)
| | - Irene Rodriguez-Hernandez
- Tumor Plasticity Laboratory, Randall Division of Cell and Molecular Biophysics, King's College London, London, UK (CH, PP, GC, IRH, JLO, NK, TC, VSM); Tumor Cell Biology Laboratory, Cancer Research UK London Research Institute, London, UK (FC, ES).Current affiliations: Tumor Microenvironment Team, Institute of Cancer Research, Chester Beatty Laboratories, London, UK (FC); Department of Biochemistry and Molecular Biology, School of Medicine, University of Murcia and IMIB-Arrixaca, Murcia, Spain (CH)
| | - Jose L Orgaz
- Tumor Plasticity Laboratory, Randall Division of Cell and Molecular Biophysics, King's College London, London, UK (CH, PP, GC, IRH, JLO, NK, TC, VSM); Tumor Cell Biology Laboratory, Cancer Research UK London Research Institute, London, UK (FC, ES).Current affiliations: Tumor Microenvironment Team, Institute of Cancer Research, Chester Beatty Laboratories, London, UK (FC); Department of Biochemistry and Molecular Biology, School of Medicine, University of Murcia and IMIB-Arrixaca, Murcia, Spain (CH)
| | - NaRa Kang
- Tumor Plasticity Laboratory, Randall Division of Cell and Molecular Biophysics, King's College London, London, UK (CH, PP, GC, IRH, JLO, NK, TC, VSM); Tumor Cell Biology Laboratory, Cancer Research UK London Research Institute, London, UK (FC, ES).Current affiliations: Tumor Microenvironment Team, Institute of Cancer Research, Chester Beatty Laboratories, London, UK (FC); Department of Biochemistry and Molecular Biology, School of Medicine, University of Murcia and IMIB-Arrixaca, Murcia, Spain (CH)
| | - Tinghine Chu
- Tumor Plasticity Laboratory, Randall Division of Cell and Molecular Biophysics, King's College London, London, UK (CH, PP, GC, IRH, JLO, NK, TC, VSM); Tumor Cell Biology Laboratory, Cancer Research UK London Research Institute, London, UK (FC, ES).Current affiliations: Tumor Microenvironment Team, Institute of Cancer Research, Chester Beatty Laboratories, London, UK (FC); Department of Biochemistry and Molecular Biology, School of Medicine, University of Murcia and IMIB-Arrixaca, Murcia, Spain (CH)
| | - Erik Sahai
- Tumor Plasticity Laboratory, Randall Division of Cell and Molecular Biophysics, King's College London, London, UK (CH, PP, GC, IRH, JLO, NK, TC, VSM); Tumor Cell Biology Laboratory, Cancer Research UK London Research Institute, London, UK (FC, ES).Current affiliations: Tumor Microenvironment Team, Institute of Cancer Research, Chester Beatty Laboratories, London, UK (FC); Department of Biochemistry and Molecular Biology, School of Medicine, University of Murcia and IMIB-Arrixaca, Murcia, Spain (CH)
| | - Victoria Sanz-Moreno
- Tumor Plasticity Laboratory, Randall Division of Cell and Molecular Biophysics, King's College London, London, UK (CH, PP, GC, IRH, JLO, NK, TC, VSM); Tumor Cell Biology Laboratory, Cancer Research UK London Research Institute, London, UK (FC, ES).Current affiliations: Tumor Microenvironment Team, Institute of Cancer Research, Chester Beatty Laboratories, London, UK (FC); Department of Biochemistry and Molecular Biology, School of Medicine, University of Murcia and IMIB-Arrixaca, Murcia, Spain (CH).
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Krüger K, Ziegler V, Hartmann C, Henninger C, Thomale J, Schupp N, Fritz G. Lovastatin prevents cisplatin-induced activation of pro-apoptotic DNA damage response (DDR) of renal tubular epithelial cells. Toxicol Appl Pharmacol 2015; 292:103-14. [PMID: 26739623 DOI: 10.1016/j.taap.2015.12.023] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Revised: 12/22/2015] [Accepted: 12/27/2015] [Indexed: 12/20/2022]
Abstract
The platinating agent cisplatin (CisPt) is commonly used in the therapy of various types of solid tumors. The anticancer efficacy of CisPt largely depends on the formation of bivalent DNA intrastrand crosslinks, which stimulate mechanisms of the DNA damage response (DDR), thereby triggering checkpoint activation, gene expression and cell death. The clinically most relevant adverse effect associated with CisPt treatment is nephrotoxicity that results from damage to renal tubular epithelial cells. Here, we addressed the question whether the HMG-CoA-reductase inhibitor lovastatin affects the DDR of renal cells by employing rat renal proximal tubular epithelial (NRK-52E) cells as in vitro model. The data show that lovastatin has extensive inhibitory effects on CisPt-stimulated DDR of NRK-52E cells as reflected on the levels of phosphorylated ATM, Chk1, Chk2, p53 and Kap1. Mitigation of CisPt-induced DDR by lovastatin was independent of the formation of DNA damage as demonstrated by (i) the analysis of Pt-(GpG) intrastrand crosslink formation by Southwestern blot analyses and (ii) the generation of DNA strand breaks as analyzed on the level of nuclear γH2AX foci and employing the alkaline comet assay. Lovastatin protected NRK-52E cells from the cytotoxicity of high CisPt doses as shown by measuring cell viability, cellular impedance and flow cytometry-based analyses of cell death. Importantly, the statin also reduced the level of kidney DNA damage and apoptosis triggered by CisPt treatment of mice. The data show that the lipid-lowering drug lovastatin extensively counteracts pro-apoptotic signal mechanisms of the DDR of tubular epithelial cells following CisPt injury.
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Affiliation(s)
- Katharina Krüger
- Institute of Toxicology, Medical Faculty, Heinrich Heine University Düsseldorf, 40225 Düsseldorf, Germany
| | - Verena Ziegler
- Institute of Toxicology, Medical Faculty, Heinrich Heine University Düsseldorf, 40225 Düsseldorf, Germany
| | - Christina Hartmann
- Institute of Toxicology, Medical Faculty, Heinrich Heine University Düsseldorf, 40225 Düsseldorf, Germany
| | - Christian Henninger
- Institute of Toxicology, Medical Faculty, Heinrich Heine University Düsseldorf, 40225 Düsseldorf, Germany
| | - Jürgen Thomale
- Institute of Cell Biology, University Duisburg-Essen, 45122 Essen, Germany
| | - Nicole Schupp
- Institute of Toxicology, Medical Faculty, Heinrich Heine University Düsseldorf, 40225 Düsseldorf, Germany
| | - Gerhard Fritz
- Institute of Toxicology, Medical Faculty, Heinrich Heine University Düsseldorf, 40225 Düsseldorf, Germany.
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Hypoxia-Targeted Drug Q6 Induces G2-M Arrest and Apoptosis via Poisoning Topoisomerase II under Hypoxia. PLoS One 2015. [PMID: 26649750 DOI: 10.1371/journal.pone.0144506.] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
In spite of the tremendous efforts dedicated to developing hypoxia-activated prodrugs, no agents yet have been approved for clinical therapy. In the present study, the hypoxic selective anti-cancer activity as well as the cellular target of a novel tirapazamine (TPZ) analogue, 7-methyl-3-(3-chlorophenyl)-quinoxaline-2-carbonitrile 1,4-dioxide (Q6) were investigated. Q6 implemented anti-cancer effects via poisoning topoisomerase II (topo II) under hypoxia. Modified trapped in agarose DNA immunostaining (TARDIS) assay showed more topo II-DNA cleavage complexes trapped by Q6 than TPZ at even lower concentration. In addition, by introducing ataxia-telangiectasia-mutated (ATM) kinase inhibitors caffeine and KU-60019, we displayed that Q6-triggered apoptosis was attributed, at least partially, to DNA double-strand breaks generated by the topo II-targeting effect. Collectively, Q6 stood out for its better hypoxia-selectivity and topo II-poisoning than the parental compound TPZ. All these data shed light on the research of Q6 as a promising hypoxia-activated prodrug candidate for human hepatocellular carcinoma therapy.
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81
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Chang L, Liu X, Wang D, Ma J, Zhou T, Chen Y, Sheng R, Hu Y, Du Y, He Q, Yang B, Zhu H. Hypoxia-Targeted Drug Q6 Induces G2-M Arrest and Apoptosis via Poisoning Topoisomerase II under Hypoxia. PLoS One 2015; 10:e0144506. [PMID: 26649750 PMCID: PMC4674137 DOI: 10.1371/journal.pone.0144506] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Accepted: 11/19/2015] [Indexed: 02/06/2023] Open
Abstract
In spite of the tremendous efforts dedicated to developing hypoxia-activated prodrugs, no agents yet have been approved for clinical therapy. In the present study, the hypoxic selective anti-cancer activity as well as the cellular target of a novel tirapazamine (TPZ) analogue, 7-methyl-3-(3-chlorophenyl)-quinoxaline-2-carbonitrile 1,4-dioxide (Q6) were investigated. Q6 implemented anti-cancer effects via poisoning topoisomerase II (topo II) under hypoxia. Modified trapped in agarose DNA immunostaining (TARDIS) assay showed more topo II–DNA cleavage complexes trapped by Q6 than TPZ at even lower concentration. In addition, by introducing ataxia-telangiectasia-mutated (ATM) kinase inhibitors caffeine and KU-60019, we displayed that Q6-triggered apoptosis was attributed, at least partially, to DNA double-strand breaks generated by the topo II-targeting effect. Collectively, Q6 stood out for its better hypoxia-selectivity and topo II-poisoning than the parental compound TPZ. All these data shed light on the research of Q6 as a promising hypoxia-activated prodrug candidate for human hepatocellular carcinoma therapy.
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Affiliation(s)
- Linlin Chang
- Zhejiang Province Key Laboratory of Anti-Cancer Drug Research, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, China
| | - Xiaowen Liu
- Zhejiang Province Key Laboratory of Anti-Cancer Drug Research, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, China
| | - Dandan Wang
- Zhejiang Province Key Laboratory of Anti-Cancer Drug Research, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, China
| | - Jian Ma
- Zhejiang Province Key Laboratory of Anti-Cancer Drug Research, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, China
| | - Tianyi Zhou
- Zhejiang Province Key Laboratory of Anti-Cancer Drug Research, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, China
| | - Ying Chen
- Zhejiang Province Key Laboratory of Anti-Cancer Drug Research, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, China
| | - Rong Sheng
- ZJU-ENS Joint Laboratory of Medicinal Chemistry, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, China
| | - Yongzhou Hu
- ZJU-ENS Joint Laboratory of Medicinal Chemistry, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, China
| | - Ying Du
- Department of Gastroenterology, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Qiaojun He
- Zhejiang Province Key Laboratory of Anti-Cancer Drug Research, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, China
| | - Bo Yang
- Zhejiang Province Key Laboratory of Anti-Cancer Drug Research, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, China
| | - Hong Zhu
- Zhejiang Province Key Laboratory of Anti-Cancer Drug Research, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, China
- * E-mail:
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Xu Q, Wang F, Xiang Y, Zhang X, Zhao ZA, Gao Z, Liu W, Lu X, Liu Y, Yu XJ, Wang H, Huang J, Yi Z, Gao S, Li L. Maternal BCAS2 protects genomic integrity in mouse early embryonic development. Development 2015; 142:3943-53. [PMID: 26428007 DOI: 10.1242/dev.129841] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2015] [Accepted: 09/24/2015] [Indexed: 11/20/2022]
Abstract
Mammalian early embryos maintain accurate genome integrity for proper development within a programmed timeline despite constant assaults on their DNA by replication, DNA demethylation and genetic defects transmitted from germ cells. However, how genome integrity is safeguarded during mammalian early embryonic development remains unclear. BCAS2 (breast carcinoma amplified sequence 2), a core component of the PRP19 complex involved in pre-mRNA splicing, plays an important role in the DNA damage response through the RPA complex, a key regulator in the maintenance of genome integrity. Currently, the physiological role of BCAS2 in mammals is unknown. We now report that BCAS2 responds to endogenous and exogenous DNA damage in mouse zygotes. Maternal depletion of BCAS2 compromises the DNA damage response in early embryos, leading to developmental arrest at the two- to four-cell stage accompanied by the accumulation of damaged DNA and micronuclei. Furthermore, BCAS2 mutants that are unable to bind RPA1 fail in DNA repair during the zygotic stage. In addition, phosphorylated RPA2 cannot localise to the DNA damage sites in mouse zygotes with disrupted maternal BCAS2. These data suggest that BCAS2 might function through the RPA complex during DNA repair in zygotes. Together, our results reveal that maternal BCAS2 maintains the genome integrity of early embryos and is essential for female mouse fertility.
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Affiliation(s)
- Qianhua Xu
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China University of Chinese Academy of Sciences, Beijing 100049, China
| | - Fengchao Wang
- National Institute of Biological Sciences, Beijing 102206, China
| | - Yunlong Xiang
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China
| | - Xiaoxin Zhang
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China
| | - Zhen-Ao Zhao
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China
| | - Zheng Gao
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wenbo Liu
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China
| | - Xukun Lu
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yusheng Liu
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China
| | - Xing-Jiang Yu
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China
| | - Haibin Wang
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China
| | - Jun Huang
- Life Sciences Institute and Innovation Center for Cell Signaling Network, Zhejiang University, Hangzhou, Zhenjiang 310058, China
| | - Zhaohong Yi
- College of Biological Science and Engineering, Beijing University of Agriculture, Beijing 102206, China
| | - Shaorong Gao
- School of Life Sciences and Technology, Tongji University, Shanghai 200092, China
| | - Lei Li
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China
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Hsieh WT, Lin HY, Chen JH, Lin WC, Kuo YH, Wood WG, Lu HF, Chung JG. Latex of Euphorbia antiquorum-induced S-phase arrest via active ATM kinase and MAPK pathways in human cervical cancer HeLa cells. ENVIRONMENTAL TOXICOLOGY 2015; 30:1205-1215. [PMID: 24706497 DOI: 10.1002/tox.21992] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Accepted: 03/23/2014] [Indexed: 06/03/2023]
Abstract
Latex of Euphorbia antiquorum (EA) has demonstrated great chemotherapeutic potential for cancer. However, the mechanisms of anti-proliferation of EA on cancer cell remain to be further investigated. The purpose of this study was to explore the influence of EA in human cervical cancer cells. Here, the cell cycle distribution by flow cytometry was examined and the protein expression by the western blotting methods was analyzed. From the cytometric results it was shown that EA-induced S-phase arrest in a concentration manner both in human cervical cancer HeLa and CaSki cells. According the western blot results it was illustrated that EA could downregulate early cyclin E1-Cdk2; and cyclin A-Cdc2 provides a significant additional quantity of S-phase promotion, that in turn promoted the expression of p21(waf1/cip1) and p27(kip1) which were the inhibitors in the complex of cyclin A and Cdc2 that led to cell cycle arrest. Moreover, EA promoted the activation of ataxia telangiectasia mutated (ATM) and check-point kinase-2 (Chk2); however, it negatively regulated the expression of Topoisomerases I and II, Cdc25A, and Cdc25C signaling. Caffeine, an ATM/ATR inhibitor significantly reversed EA downregulation in the levels of Cdc25A. Furthermore, JNK inhibitor SP600125 and p38 MAPK inhibitor SB203580 both could reverse the EA upregulation of the protein of Chk2 level, significantly. This study, therefore, revealed that EA could downregulate topoisomerase, and activate ATM kinase, which then induce parallel Chk 1/2 and MAPK signaling pathways to promote the degradation of Cdc25A to induced S-phase arrest in human cervical cancer HeLa cells.
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Affiliation(s)
- Wen-Tsong Hsieh
- Department of Pharmacology, China Medical University, Taichung, Taiwan
| | - Hui-Yi Lin
- School of Pharmacy, China Medical University, Taichung, Taiwan
| | - Jou-Hsuan Chen
- Department of Pharmacology, China Medical University, Taichung, Taiwan
| | - Wen-Chung Lin
- Department of Pharmacology, China Medical University, Taichung, Taiwan
| | - Yueh-Hsiung Kuo
- Tsuzuki Institute for Traditional Medicine, College of Pharmacy, China Medical University, Taichung, Taiwan
| | - W Gibson Wood
- Department of Pharmacology, School of Medicine, Geriatric Research, Education and Clinical Center, VA Medical Center, University of Minnesota, Minneapolis, Minnesota
| | - Hsu-Feng Lu
- Department of Clinical Pathology, Cheng Hsin General Hospital, Taipei, 112, Taiwan
- Department of Restaurant, Hotel and Institutional Management, Fu-Jen Catholic University, New Taipei, 242, Taiwan
| | - Jing-Gung Chung
- Department of Biological Science and Technology, China Medical University, Taichung, 404, Taiwan
- Department of Biotechnology, Asia University, Taichung, 413, Taiwan
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Lin F, Ma XS, Wang ZB, Wang ZW, Luo YB, Huang L, Jiang ZZ, Hu MW, Schatten H, Sun QY. Different fates of oocytes with DNA double-strand breaks in vitro and in vivo. Cell Cycle 2015; 13:2674-80. [PMID: 25486355 DOI: 10.4161/15384101.2015.945375] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
In female mice, despite the presence of slight DNA double-strand breaks (DSBs), fully grown oocytes are able to undergo meiosis resumption as indicated by germinal vesicle breakdown (GVBD); however, severe DNA DSBs do reduce and delay entry into M phase through activation of the DNA damage checkpoint. But little is known about the effect of severe DNA DSBs on the spindle assembly checkpoint (SAC) during oocyte maturation. We showed that nearly no first polar body (PB1) was extruded at 12 h of in vitro maturation (IVM) in severe DNA DSBs oocytes, and the limited number of oocytes with PB1 were actually at telophase. However, about 60% of the severe DNA DSBs oocytes which underwent GVBD at 2 h of IVM released a PB1 at 18 h of IVM and these oocytes did reach the second metaphase (MII) stage. Chromosome spread at MI and MII stages showed that chromosomes fragmented after GVBD in severe DNA DSBs oocytes. The delayed PB1 extrusion was due to the disrupted attachment of microtubules to kinetochores and activation of the SAC. At the same time, misaligned chromosome fragments became obvious at the first metaphase (MI) in severe DNA DSBs oocytes. These data implied that the inactivation of SAC during the metaphase-anaphase transition of first meiosis was independent of chromosome integrity. Next, we induced DNA DSBs in vivo, and found that the number of superovulated oocytes per mouse was significantly reduced; moreover, this treatment increased the percentage of apoptotic oocytes. These results suggest that DNA DSBs oocytes undergo apoptosis in vivo.
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Key Words
- DDR, DNA damage response
- DNA double-strand breaks
- DSBs, DNA double-strand breaks
- GVBD, germinal vesicle breakdown
- ICL, interstrand crosslinks
- IVM, in vitro maturation
- MI, the first metaphase
- MII, the second metaphase
- PB1, first polar body
- PBE, PB1 extrusion
- SAC, spindle assembly checkpoint
- apoptosis
- meiosis
- oocyte
- spindle assembly checkpoint
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Affiliation(s)
- Fei Lin
- a State Key Laboratory of Reproductive Biology; Institute of Zoology; Chinese Academy of Sciences ; Beijing , China
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85
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Abstract
DNA damage is induced in many types of cells by internal and external cell stress. When DNA is damaged, DNA Damage Response (DDR) programs are activated to repair the DNA lesions in order to preserve genomic integrity and suppress subsequent malignant transformation. Among these programs is cell cycle checkpoint that ensures cell cycle arrest and subsequent repair of the damaged DNA, apoptosis and senescence in various phases of the cell cycle. Moreover, recent studies have established the cell differentiation checkpoint, the other type of the checkpoint that is specifically activated in the course of differentiation. We will discuss the evidences that support the link between DNA damage proteins and C2C12 cell differentiation.
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Affiliation(s)
- Sara Cuesta Sancho
- Department of Cancer Genetics, Roswell Park Cancer Institute, Buffalo, NY14263, USA
| | - Toru Ouchi
- Department of Cancer Genetics, Roswell Park Cancer Institute, Buffalo, NY14263, USA
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86
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Wang JY, Chen SY, Sun CN, Chien T, Chern Y. A central role of TRAX in the ATM-mediated DNA repair. Oncogene 2015; 35:1657-70. [PMID: 26096928 DOI: 10.1038/onc.2015.228] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2015] [Revised: 05/04/2015] [Accepted: 05/18/2015] [Indexed: 12/21/2022]
Abstract
DNA repair is critical for the maintenance of genome stability. Upon genotoxic stress, dysregulated DNA repair may induce apoptosis. Translin-associated factor X (TRAX), which was initially identified as a binding partner of Translin, has been implicated in genome stability. However, the exact role of TRAX in DNA repair remains largely unknown. Here, we showed that TRAX participates in the ATM/H2AX-mediated DNA repair machinery by interacting with ATM and stabilizing the MRN complex at double-strand breaks. The exogenous expression of wild-type (WT) TRAX, but not a TRAX variant lacking the nuclear localization signal (NLS), rescued the vulnerability of TRAX-null mouse embryo fibroblasts (MEFs). This finding confirms the importance of the nuclear localization of TRAX in the repair of DNA damage. Compared with WT MEFs, TRAX-null MEFs exhibited impaired DNA repair (for example, reduced phosphorylation of ATM and H2AX) after treatment with ultra violet-C or γ-ray irradiation and a higher incidence of p53-mediated apoptosis. Our findings demonstrate that TRAX is required for MRN complex-ATM-H2AX signaling, which optimizes DNA repair by interacting with the activated ATM and protects cells from genotoxic stress-induced apoptosis.
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Affiliation(s)
- J-Y Wang
- Department of Neurology, School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.,Neuroscience Division, Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
| | - S-Y Chen
- Neuroscience Division, Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
| | - C-N Sun
- Neuroscience Division, Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
| | - T Chien
- Institute of Life Sciences, National Defense Medical Center, Taipei, Taiwan
| | - Y Chern
- Neuroscience Division, Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan.,Institute of Life Sciences, National Defense Medical Center, Taipei, Taiwan
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87
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Stuhldreier F, Kassel S, Schumacher L, Wesselborg S, Proksch P, Fritz G. Pleiotropic effects of spongean alkaloids on mechanisms of cell death, cell cycle progression and DNA damage response (DDR) of acute myeloid leukemia (AML) cells. Cancer Lett 2015; 361:39-48. [DOI: 10.1016/j.canlet.2015.02.030] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2014] [Revised: 02/10/2015] [Accepted: 02/12/2015] [Indexed: 11/29/2022]
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88
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Abstract
In order to maintain genomic stability, cells have developed sophisticated signalling pathways to enable DNA damage or DNA replication stress to be resolved. Key mediators of this DNA damage response (DDR) are the ATM and ATR kinases, which induce cell cycle arrest and facilitate DNA repair via their downstream targets. Inhibiting the DDR has become an attractive therapeutic concept in cancer therapy, since (i) resistance to genotoxic therapies has been associated with increased DDR signalling, and (ii) many cancers have defects in certain components of the DDR rendering them highly dependent on the remaining DDR pathways for survival. ATM and ATR act as the apical regulators of the response to DNA double strand breaks and replication stress, respectively, with overlapping but non-redundant activities. Highly selective small molecule inhibitors of ATM and ATR are currently in preclinical and clinical development, respectively. Preclinical data have provided a strong rationale for clinical testing of these compounds both in combination with radio- or chemotherapy, and in synthetic lethal approaches to treat tumours with deficiencies in certain DDR components. Whole genome sequencing studies have reported that mutations in DDR genes occur with a high frequency in many common tumour types, suggesting that a synthetic lethal approach with ATM or ATR inhibitors could have widespread utility, providing that appropriate biomarkers are developed.
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Affiliation(s)
- Anika Maria Weber
- Cancer Research UK and Medical Research Council Oxford Institute for Radiation Oncology, The Department of Oncology, University of Oxford, Oxford OX3 7DQ, UK
| | - Anderson Joseph Ryan
- Cancer Research UK and Medical Research Council Oxford Institute for Radiation Oncology, The Department of Oncology, University of Oxford, Oxford OX3 7DQ, UK.
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89
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Kim S, Lee HS, Ji JH, Cho MY, Yoo YS, Park YY, Cha HJ, Lee Y, Kim Y, Cho H. Hepatitis B virus X protein activates the ATM-Chk2 pathway and delays cell cycle progression. J Gen Virol 2015; 96:2242-2251. [PMID: 25872745 DOI: 10.1099/vir.0.000150] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Genetic instability is intimately associated with tumour development. In particular, liver cancers associated with hepatitis B virus (HBV) exhibit high genetic instability; however, our understanding of the underlying molecular mechanisms remains limited. In this study, we found that γ-H2AX, a marker of DNA double-strand breaks (DSBs), and the levels of phospho-Chk2 (p-Chk2, the activated form) were significantly elevated in HBV-associated hepatocellular carcinomas and neighbouring regenerating nodules. Likewise, introduction of the pHBV or pMyc-HBx plasmids into cells induced accumulation of γ-H2AX foci and increased the p-Chk2 level. In these cells, inhibitory phosphorylation of Cdc25C phosphatase (Ser(216)) and CDK1 (Tyr(15)) was elevated; consequently, cell-cycle progression was delayed at G2/M phase, suggesting that activation of the ATM-Chk2 pathway by the HBV X protein (HBx) induces cell-cycle delay. Accordingly, inhibition of ataxia telangiectasia mutated (ATM) by caffeine or siRNA abolished the increase in the p-Chk2 level and restored the delayed CDK1 kinase activity in ChangX cells. We also found that cytoplasmic HBx, but not nuclear HBx, induced reactive oxygen species (ROS) production and led to the accumulation of γ-H2AX foci and the increased p-Chk2 level. Together, these data indicate that HBx-induced ROS accumulation induces DNA damage that activates the ATM-Chk2 pathway. Our findings provide insight into the mechanisms of HBV pathogenesis.
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Affiliation(s)
- Sujeong Kim
- Department of Biochemistry and Molecular Biology, Ajou University School of Medicine, Suwon, Republic of Korea
| | - Ho-Soo Lee
- Department of Biochemistry and Molecular Biology, Ajou University School of Medicine, Suwon, Republic of Korea.,Department of Biomedical Sciences, The Graduate School of Ajou University, Suwon, Republic of Korea
| | - Jae-Hoon Ji
- Genomic Instability Research Center, Ajou University School of Medicine, Suwon, Republic of Korea
| | - Mi-Young Cho
- Department of Biochemistry and Molecular Biology, Ajou University School of Medicine, Suwon, Republic of Korea.,Department of Biomedical Sciences, The Graduate School of Ajou University, Suwon, Republic of Korea
| | - Young-Suk Yoo
- Department of Biochemistry and Molecular Biology, Ajou University School of Medicine, Suwon, Republic of Korea.,Department of Biomedical Sciences, The Graduate School of Ajou University, Suwon, Republic of Korea
| | - Yong-Yea Park
- Department of Biochemistry and Molecular Biology, Ajou University School of Medicine, Suwon, Republic of Korea
| | - Hyuk-Jin Cha
- Department of Life Sciences, Sogang University, Seoul, Republic of Korea
| | - Youngsoo Lee
- Genomic Instability Research Center, Ajou University School of Medicine, Suwon, Republic of Korea
| | - Youngbae Kim
- Department of Pathology, Ajou University School of Medicine, Suwon, Republic of Korea
| | - Hyeseong Cho
- Department of Biomedical Sciences, The Graduate School of Ajou University, Suwon, Republic of Korea.,Department of Biochemistry and Molecular Biology, Ajou University School of Medicine, Suwon, Republic of Korea.,Genomic Instability Research Center, Ajou University School of Medicine, Suwon, Republic of Korea
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90
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Platinum-induced kidney damage: Unraveling the DNA damage response (DDR) of renal tubular epithelial and glomerular endothelial cells following platinum injury. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2015; 1853:685-98. [DOI: 10.1016/j.bbamcr.2014.12.033] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2014] [Revised: 12/17/2014] [Accepted: 12/29/2014] [Indexed: 11/19/2022]
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91
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Wojcik T, Buczek E, Majzner K, Kolodziejczyk A, Miszczyk J, Kaczara P, Kwiatek W, Baranska M, Szymonski M, Chlopicki S. Comparative endothelial profiling of doxorubicin and daunorubicin in cultured endothelial cells. Toxicol In Vitro 2014; 29:512-21. [PMID: 25529801 DOI: 10.1016/j.tiv.2014.12.009] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Revised: 12/06/2014] [Accepted: 12/08/2014] [Indexed: 01/06/2023]
Abstract
Although anthracycline antibiotics have been successfully used for nearly half a century in the treatment of various malignancies, their use is limited by their cardiac and vascular toxicities, and the mechanisms of these toxicities are still not entirely clear. Herein, we comprehensively characterized cytotoxic effects of two structurally related anthracyclines, doxorubicin and daunorubicin. In nanomolar concentrations, both drugs induced DNA damage and increased nuclear area that were associated with their accumulation in the nucleus (doxorubicin ⩾50 nM and daunorubicin ⩾25 nM) as evidence by Raman microspectroscopy at 3820-4245 cm(-1). At low micromolar concentrations, doxorubicin (⩾5 μM) and daunorubicin (⩾1 μM) increased the generation of reactive oxygen species, decreased intracellular reduced glutathione, induced an alteration in endothelial elasticity and caused a reorganization of the F-actin cytoskeleton. In isolated mouse aortic rings, doxorubicin (⩾50 μM) was less potent than daunorubicin (⩾5 μM) in impairing the endothelium-dependent response. In summary, using a comprehensive endothelial profiling approach, we demonstrated clear-cut differences in the potencies to induce endotheliotoxic responses for two structurally similar chemotherapeutics, at a nuclear, cytosolic and membrane levels. Furthermore, our results suggest that the differences in the endothelial toxicities of doxorubicin and daunorubicin are linked to differences in their nuclear accumulation and the DNA damage-triggered response of the endothelium.
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Affiliation(s)
- Tomasz Wojcik
- Jagiellonian Centre for Experimental Therapeutics (JCET), Jagiellonian University, Bobrzynskiego 14, 30-348 Krakow, Poland
| | - Elzbieta Buczek
- Jagiellonian Centre for Experimental Therapeutics (JCET), Jagiellonian University, Bobrzynskiego 14, 30-348 Krakow, Poland
| | - Katarzyna Majzner
- Jagiellonian Centre for Experimental Therapeutics (JCET), Jagiellonian University, Bobrzynskiego 14, 30-348 Krakow, Poland; Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Krakow, Poland
| | - Agnieszka Kolodziejczyk
- Department of Physics of Nanostructures and Nanotechnology, Jagiellonian University, Reymonta 4, 30-059 Krakow, Poland
| | - Justyna Miszczyk
- Department of Experimental Physics of Complex Systems, The H. Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, 31-342 Krakow, Poland
| | - Patrycja Kaczara
- Jagiellonian Centre for Experimental Therapeutics (JCET), Jagiellonian University, Bobrzynskiego 14, 30-348 Krakow, Poland
| | - Wojciech Kwiatek
- Department of Experimental Physics of Complex Systems, The H. Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, 31-342 Krakow, Poland
| | - Malgorzata Baranska
- Jagiellonian Centre for Experimental Therapeutics (JCET), Jagiellonian University, Bobrzynskiego 14, 30-348 Krakow, Poland; Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Krakow, Poland
| | - Marek Szymonski
- Department of Physics of Nanostructures and Nanotechnology, Jagiellonian University, Reymonta 4, 30-059 Krakow, Poland
| | - Stefan Chlopicki
- Jagiellonian Centre for Experimental Therapeutics (JCET), Jagiellonian University, Bobrzynskiego 14, 30-348 Krakow, Poland; Department of Experimental Pharmacology, Chair of Pharmacology, Jagiellonian University, Medical College, Grzegorzecka 16, 31-531 Krakow, Poland.
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92
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The molecular mechanisms underlying the therapeutic resistance of cancer stem cells. Arch Pharm Res 2014; 38:389-401. [DOI: 10.1007/s12272-014-0531-1] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2014] [Accepted: 12/08/2014] [Indexed: 12/19/2022]
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93
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Andrs M, Korabecny J, Jun D, Hodny Z, Bartek J, Kuca K. Phosphatidylinositol 3-Kinase (PI3K) and phosphatidylinositol 3-kinase-related kinase (PIKK) inhibitors: importance of the morpholine ring. J Med Chem 2014; 58:41-71. [PMID: 25387153 DOI: 10.1021/jm501026z] [Citation(s) in RCA: 105] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Phosphatidylinositol 3-kinases (PI3Ks) and phosphatidylinositol 3-kinase-related protein kinases (PIKKs) are two related families of kinases that play key roles in regulation of cell proliferation, metabolism, migration, survival, and responses to diverse stresses including DNA damage. To design novel efficient strategies for treatment of cancer and other diseases, these kinases have been extensively studied. Despite their different nature, these two kinase families have related origin and share very similar kinase domains. Therefore, chemical inhibitors of these kinases usually carry analogous structural motifs. The most common feature of these inhibitors is a critical hydrogen bond to morpholine oxygen, initially present in the early nonspecific PI3K and PIKK inhibitor 3 (LY294002), which served as a valuable chemical tool for development of many additional PI3K and PIKK inhibitors. While several PI3K pathway inhibitors have recently shown promising clinical responses, inhibitors of the DNA damage-related PIKKs remain thus far largely in preclinical development.
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Affiliation(s)
- Martin Andrs
- Biomedical Research Center, University Hospital Hradec Kralove , Sokolska 81, 500 05 Hradec Kralove, Czech Republic
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94
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Aqeilan RI, Abu-Remaileh M, Abu-Odeh M. The common fragile site FRA16D gene product WWOX: roles in tumor suppression and genomic stability. Cell Mol Life Sci 2014; 71:4589-99. [PMID: 25245215 PMCID: PMC11113097 DOI: 10.1007/s00018-014-1724-y] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2014] [Accepted: 08/28/2014] [Indexed: 10/24/2022]
Abstract
The fragile WWOX gene, encompassing the chromosomal fragile site FRA16D, is frequently altered in human cancers. While vulnerable to DNA damage itself, recent evidence has shown that the WWOX protein is essential for proper DNA damage response (DDR). Furthermore, the gene product, WWOX, has been associated with multiple protein networks, highlighting its critical functions in normal cell homeostasis. Targeted deletion of Wwox in murine models suggests its in vivo requirement for proper growth, metabolism, and survival. Recent molecular and biochemical analyses of WWOX functions highlighted its role in modulating aerobic glycolysis and genomic stability. Cumulatively, we propose that the gene product of FRA16D, WWOX, is a functionally essential protein that is required for cell homeostasis and that its deletion has important consequences that contribute to the neoplastic process. This review discusses the essential role of WWOX in tumor suppression and genomic stability and how its alteration contributes to cancer transformation.
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Affiliation(s)
- Rami I Aqeilan
- The Lautenberg Center for Immunology and Cancer Research, IMRIC, Faculty of Medicine, Hebrew University of Jerusalem, 91220, Jerusalem, Israel,
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95
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Wang RH, Lahusen TJ, Chen Q, Xu X, Jenkins LMM, Leo E, Fu H, Aladjem M, Pommier Y, Appella E, Deng CX. SIRT1 deacetylates TopBP1 and modulates intra-S-phase checkpoint and DNA replication origin firing. Int J Biol Sci 2014; 10:1193-202. [PMID: 25516717 PMCID: PMC4261203 DOI: 10.7150/ijbs.11066] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Accepted: 11/24/2014] [Indexed: 12/22/2022] Open
Abstract
SIRT1, the mammalian homolog of yeast Sir2, is a founding member of a family of 7 protein and histone deacetylases that are involved in numerous biological functions. Previous studies revealed that SIRT1 deficiency results in genome instability, which eventually leads to cancer formation, yet the underlying mechanism is unclear. To investigate this, we conducted a proteomics study and found that SIRT1 interacted with many proteins involved in replication fork protection and origin firing. We demonstrated that loss of SIRT1 resulted in increased replication origin firing, asymmetric fork progression, defective intra-S-phase checkpoint, and chromosome damage. Mechanistically, SIRT1 deacetylates and affects the activity of TopBP1, which plays an essential role in DNA replication fork protection and replication origin firing. Our study demonstrated that ectopic over-expression of the deacetylated form of TopBP1 in SIRT1 mutant cells repressed replication origin firing, while the acetylated form of TopBP1 lost this function. Thus, SIRT1 acts upstream of TopBP1 and plays an essential role in maintaining genome stability by modulating DNA replication fork initiation and the intra-S-phase cell cycle checkpoint.
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Affiliation(s)
- Rui-Hong Wang
- 1. Genetics of Development and Disease Branch, 10/9N105, National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland MD 20892, USA; ; 4. Faculty of Health Sciences, University of Macau, Macau, SAR of People's Republic of China
| | - Tyler J Lahusen
- 1. Genetics of Development and Disease Branch, 10/9N105, National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland MD 20892, USA
| | - Qiang Chen
- 1. Genetics of Development and Disease Branch, 10/9N105, National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland MD 20892, USA
| | - Xiaoling Xu
- 1. Genetics of Development and Disease Branch, 10/9N105, National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland MD 20892, USA; ; 4. Faculty of Health Sciences, University of Macau, Macau, SAR of People's Republic of China
| | - Lisa M Miller Jenkins
- 2. Laboratory of Cell Biology, National Institutes of Health, Bethesda, Maryland MD 20892, USA
| | - Elisabetta Leo
- 3. Developmental Therapeutics Branch, National Cancer Institute, National Institutes of Health, Bethesda, Maryland MD 20892, USA
| | - Haiqing Fu
- 3. Developmental Therapeutics Branch, National Cancer Institute, National Institutes of Health, Bethesda, Maryland MD 20892, USA
| | - Mirit Aladjem
- 3. Developmental Therapeutics Branch, National Cancer Institute, National Institutes of Health, Bethesda, Maryland MD 20892, USA
| | - Yves Pommier
- 3. Developmental Therapeutics Branch, National Cancer Institute, National Institutes of Health, Bethesda, Maryland MD 20892, USA
| | - Ettore Appella
- 2. Laboratory of Cell Biology, National Institutes of Health, Bethesda, Maryland MD 20892, USA
| | - Chu-Xia Deng
- 1. Genetics of Development and Disease Branch, 10/9N105, National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland MD 20892, USA; ; 4. Faculty of Health Sciences, University of Macau, Macau, SAR of People's Republic of China
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96
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Abu-Odeh M, Salah Z, Herbel C, Hofmann TG, Aqeilan RI. WWOX, the common fragile site FRA16D gene product, regulates ATM activation and the DNA damage response. Proc Natl Acad Sci U S A 2014; 111:E4716-25. [PMID: 25331887 PMCID: PMC4226089 DOI: 10.1073/pnas.1409252111] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Genomic instability is a hallmark of cancer. The WW domain-containing oxidoreductase (WWOX) is a tumor suppressor spanning the common chromosomal fragile site FRA16D. Here, we report a direct role of WWOX in DNA damage response (DDR) and DNA repair. We show that Wwox deficiency results in reduced activation of the ataxia telangiectasia-mutated (ATM) checkpoint kinase, inefficient induction and maintenance of γ-H2AX foci, and impaired DNA repair. Mechanistically, we show that, upon DNA damage, WWOX accumulates in the cell nucleus, where it interacts with ATM and enhances its activation. Nuclear accumulation of WWOX is regulated by its K63-linked ubiquitination at lysine residue 274, which is mediated by the E3 ubiquitin ligase ITCH. These findings identify a novel role for the tumor suppressor WWOX and show that loss of WWOX expression may drive genomic instability and provide an advantage for clonal expansion of neoplastic cells.
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Affiliation(s)
- Mohammad Abu-Odeh
- The Lautenberg Center for General and Tumor Immunology, Department of Immunology and Cancer Research-Institute for Medical Research Israel-Canada, Hebrew University-Hadassah Medical School, Jerusalem 91120, Israel
| | - Zaidoun Salah
- The Lautenberg Center for General and Tumor Immunology, Department of Immunology and Cancer Research-Institute for Medical Research Israel-Canada, Hebrew University-Hadassah Medical School, Jerusalem 91120, Israel; Al Quds-Bard College, Al-Quds University, Abu Dies, East Jerusalem; and
| | - Christoph Herbel
- German Cancer Research Center, Cellular Senescence Group, German Cancer Research Center-Zentrum für Molekulare Biologie der Universität Heidelberg Alliance, 69120 Heidelberg, Germany
| | - Thomas G Hofmann
- German Cancer Research Center, Cellular Senescence Group, German Cancer Research Center-Zentrum für Molekulare Biologie der Universität Heidelberg Alliance, 69120 Heidelberg, Germany
| | - Rami I Aqeilan
- The Lautenberg Center for General and Tumor Immunology, Department of Immunology and Cancer Research-Institute for Medical Research Israel-Canada, Hebrew University-Hadassah Medical School, Jerusalem 91120, Israel;
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97
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Mobile DNA elements in the generation of diversity and complexity in the brain. Nat Rev Neurosci 2014; 15:497-506. [PMID: 25005482 DOI: 10.1038/nrn3730] [Citation(s) in RCA: 180] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Mobile elements are DNA sequences that can change their position (retrotranspose) within the genome. Although its biological function is largely unappreciated, DNA derived from mobile elements comprises nearly half of the human genome. It has long been thought that neuronal genomes are invariable; however, recent studies have demonstrated that mobile elements actively retrotranspose during neurogenesis, thereby creating genomic diversity between neurons. In addition, mounting data demonstrate that mobile elements are misregulated in certain neurological disorders, including Rett syndrome and schizophrenia.
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98
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Carvalho RS, Fernandes VC, Nepomuceno TC, Rodrigues DC, Woods NT, Suarez-Kurtz G, Chammas R, Monteiro AN, Carvalho MA. Characterization of LGALS3 (galectin-3) as a player in DNA damage response. Cancer Biol Ther 2014; 15:840-50. [PMID: 24755837 DOI: 10.4161/cbt.28873] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
DNA damage repair (DDR) is an orchestrated process encompassing the injury detection to its complete resolution. DNA double-strand break lesions are repaired mainly by two distinct mechanisms: the error-free homologous recombination (HR) and the error-prone non-homologous end-joining. Galectin-3 (GAL3) is the unique member of the chimeric galectins subfamily and is reported to be involved in several cancer development and progression related events. Recently our group described a putative protein interaction between GAL3 and BARD1, the main partner of breast and ovarian cancer susceptibility gene product BRCA1, both involved in HR pathway. In this report we characterized GAL3/BARD1 protein interaction and evaluated the role of GAL3 in DDR pathways using GAL3 silenced human cells exposed to different DNA damage agents. In the absence of GAL3 we observed a delayed DDR response activation, as well as a decrease in the G 2/M cell cycle checkpoint arrest associated with HR pathway. Moreover, using a TAP-MS approach we also determined the protein interaction network of GAL3.
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Affiliation(s)
- Renato S Carvalho
- Instituto de Biofísica Carlos Chagas Filho; Universidade Federal do Rio de Janeiro; Rio de Janeiro, Brazil; Cancer Epidemiology Program; H. Lee Moffitt Cancer Center & Research Institute; Tampa, FL USA
| | | | | | - Deivid C Rodrigues
- Instituto de Biofísica Carlos Chagas Filho; Universidade Federal do Rio de Janeiro; Rio de Janeiro, Brazil
| | - Nicholas T Woods
- Cancer Epidemiology Program; H. Lee Moffitt Cancer Center & Research Institute; Tampa, FL USA
| | | | - Roger Chammas
- Faculdade de Medicina; Universidade de São Paulo; São Paulo, Brazil
| | - Alvaro N Monteiro
- Cancer Epidemiology Program; H. Lee Moffitt Cancer Center & Research Institute; Tampa, FL USA
| | - Marcelo A Carvalho
- Instituto Federal do Rio de Janeiro (IFRJ); Rio de Janeiro, Brazil; Programa de Farmacologia; Instituto Nacional de Câncer; Rio de Janeiro, Brazil
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99
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Evaluation of bendamustine in combination with fludarabine in primary chronic lymphocytic leukemia cells. Blood 2014; 123:3780-9. [PMID: 24747434 DOI: 10.1182/blood-2013-12-541433] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
The fludarabine and cyclophosphamide couplet has become the backbone of the chronic lymphocytic leukemia (CLL) standard of care. Although this is an effective treatment, it results in untoward toxicity. Bendamustine is a newly approved and better-tolerated alkylating agent. We hypothesized that similar to cyclophosphamide, bendamustine-induced DNA damage will be inhibited by fludarabine, resulting in increased cytotoxicity. To test this hypothesis and the role of the stromal microenvironment in this process, we treated CLL lymphocytes in vitro with each drug alone and in combination. Simultaneous or prior addition of fludarabine to bendamustine resulted in maximum cytotoxicity assayed by 3,3'-dihexyloxacarbocyanine iodine negativity, annexin positivity, and poly (adenosine 5'-diphosphate-ribose) polymerase cleavage. Cytotoxicity elicited by combination of both agents was similar in these malignant B cells cultured either in suspension or on marrow stroma cells. Cell death was associated with DNA damage response, which was determined by phosphorylation of H2AX and unscheduled DNA synthesis. H2AX activation was maximum with the drug combination, and unscheduled DNA synthesis induced by bendamustine was blocked by fludarabine. In parallel, ATM, Chk2, and p53 were phosphorylated and PUMA was induced. Cell death was caspase independent; however, caspases did decrease levels of Mcl-1 survival protein. These data provide a rationale for combining fludarabine with bendamustine for patients with CLL.
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Cucurbitacin B induced ATM-mediated DNA damage causes G2/M cell cycle arrest in a ROS-dependent manner. PLoS One 2014; 9:e88140. [PMID: 24505404 PMCID: PMC3913755 DOI: 10.1371/journal.pone.0088140] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2013] [Accepted: 01/05/2014] [Indexed: 01/11/2023] Open
Abstract
Cucurbitacins are a class of triterpenoids widely distributed in plant kingdom with potent anti-cancer activities both in vitro and in vivo by inducing cycle arrest, autophagy, and apoptosis. Cucurbitacin B (Cuc B), could induce S or G2/M cell cycle arrest in cancer cells while the detailed mechanisms remain to be clear. This study was designed to precisely dissect the signaling pathway(s) responsible for Cuc B induced cell cycle arrest in human lung adenocarcinoma epithelial A549 cells. We demonstrated that low concentrations of Cuc B dramatically induced G2/M phase arrest in A549 cells. Cuc B treatment caused DNA double-strand breaks (DSBs) without affecting the signal transducer and activator of transcription 3 (STAT3), the potential molecular target for Cuc B. Cuc B triggers ATM-activated Chk1-Cdc25C-Cdk1, which could be reversed by both ATM siRNA and Chk1 siRNA. Cuc B also triggers ATM-activated p53-14-3-3-σ pathways, which could be reversed by ATM siRNA. Cuc B treatment also led to increased intracellular reactive oxygen species (ROS) formation, which was inhibited by N-acetyl-l-cysteine (NAC) pretreatment. Furthermore, NAC pretreatment inhibited Cuc B induced DNA damage and G2/M phase arrest. Taken together, these results suggested that Cuc B induces DNA damage in A549 cells mediated by increasing intracellular ROS formation, which lead to G2/M cell phase arrest through ATM-activated Chk1-Cdc25C-Cdk1 and p53-14-3-3-σ parallel branches. These observations provide novel mechanisms and potential targets for better understanding of the anti-cancer mechanisms of cucurbitacins.
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