1
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Tortolici F, Vumbaca S, Incocciati B, Dayal R, Aquilano K, Giovanetti A, Rufini S. Ionizing Radiation-Induced Extracellular Vesicle Release Promotes AKT-Associated Survival Response in SH-SY5Y Neuroblastoma Cells. Cells 2021; 10:cells10010107. [PMID: 33430027 PMCID: PMC7827279 DOI: 10.3390/cells10010107] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2020] [Revised: 12/31/2020] [Accepted: 01/05/2021] [Indexed: 12/14/2022] Open
Abstract
Radiation therapy is one of the most effective methods of tumor eradication; however, in some forms of neuroblastoma, radiation can increase the risk of secondary neoplasms, due to the ability of irradiated cells to transmit pro-survival signals to non-irradiated cells through vesicle secretion. The aims of this study were to characterize the vesicles released by the human neuroblastoma cell line SH-SY5Y following X-ray radiations and their ability to increase invasiveness in non-irradiated SH-SY5Y cells. We first purified the extracellular vesicles released by the SH-SY5Y cells following X-rays, and then determined their total amount, dimensions, membrane protein composition, and cellular uptake. We also examined the effects of these extracellular vesicles on viability, migration, and DNA damage in recipient SH-SY5Y cells. We found that exposure to X-rays increased the release of extracellular vesicles and altered their protein composition. These vesicles were readily uptaken by non-irradiated cells, inducing an increase in viability, migration, and radio-resistance. The same results were obtained in an MYCN-amplified SK-N-BE cell line. Our study demonstrates that vesicles released from irradiated neuroblastoma cells stimulate proliferation and invasiveness that correlate with the epithelial to mesenchymal transition in non-irradiated cells. Moreover, our results suggest that, at least in neuroblastomas, targeting the extracellular vesicles may represent a novel therapeutic approach to counteract the side effects associated with radiotherapy.
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Affiliation(s)
- Flavia Tortolici
- Department of Biology, University of Rome Tor Vergata, 00133 Rome, Italy; (F.T.); (S.V.); (B.I.); (K.A.)
| | - Simone Vumbaca
- Department of Biology, University of Rome Tor Vergata, 00133 Rome, Italy; (F.T.); (S.V.); (B.I.); (K.A.)
| | - Bernadette Incocciati
- Department of Biology, University of Rome Tor Vergata, 00133 Rome, Italy; (F.T.); (S.V.); (B.I.); (K.A.)
| | - Renu Dayal
- Sanorva Biotech Private Limited, Mysuru 570008, India;
| | - Katia Aquilano
- Department of Biology, University of Rome Tor Vergata, 00133 Rome, Italy; (F.T.); (S.V.); (B.I.); (K.A.)
| | - Anna Giovanetti
- ENEA, Department of Energy and Sustainable Economic, 00123 Rome, Italy;
| | - Stefano Rufini
- Department of Biology, University of Rome Tor Vergata, 00133 Rome, Italy; (F.T.); (S.V.); (B.I.); (K.A.)
- Correspondence:
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2
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Gomez Godinez V, Kabbara S, Sherman A, Wu T, Cohen S, Kong X, Maravillas-Montero JL, Shi Z, Preece D, Yokomori K, Berns MW. DNA damage induced during mitosis undergoes DNA repair synthesis. PLoS One 2020; 15:e0227849. [PMID: 32343690 PMCID: PMC7188217 DOI: 10.1371/journal.pone.0227849] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2019] [Accepted: 04/01/2020] [Indexed: 12/13/2022] Open
Abstract
Understanding the mitotic DNA damage response (DDR) is critical to our comprehension of cancer, premature aging and developmental disorders which are marked by DNA repair deficiencies. In this study we use a micro-focused laser to induce DNA damage in selected mitotic chromosomes to study the subsequent repair response. Our findings demonstrate that (1) mitotic cells are capable of DNA repair as evidenced by DNA synthesis at damage sites, (2) Repair is attenuated when DNA-PKcs and ATM are simultaneously compromised, (3) Laser damage may permit the observation of previously undetected DDR proteins when damage is elicited by other methods in mitosis, and (4) Twenty five percent of mitotic DNA-damaged cells undergo a subsequent mitosis. Together these findings suggest that mitotic DDR is more complex than previously thought and may involve factors from multiple repair pathways that are better understood in interphase.
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Affiliation(s)
- Veronica Gomez Godinez
- Institute of Engineering in Medicine, University of California-San Diego, San Diego, California, United States of America
| | - Sami Kabbara
- Department of Developmental and Cell Biology, University of California-Irvine, Irvine, California, United States of America
- Beckman Laser Institute, University of California-Irvine, Irvine, California, United States of America
| | - Adria Sherman
- Institute of Engineering in Medicine, University of California-San Diego, San Diego, California, United States of America
- Beckman Laser Institute, University of California-Irvine, Irvine, California, United States of America
| | - Tao Wu
- Beckman Laser Institute, University of California-Irvine, Irvine, California, United States of America
- Department of Biomedical Engineering, University of California-Irvine, Irvine, California, United States of America
| | - Shirli Cohen
- Institute of Engineering in Medicine, University of California-San Diego, San Diego, California, United States of America
| | - Xiangduo Kong
- Department of Biological Chemistry, University of California-Irvine, Irvine, California, United States of America
| | | | - Zhixia Shi
- Institute of Engineering in Medicine, University of California-San Diego, San Diego, California, United States of America
| | - Daryl Preece
- Beckman Laser Institute, University of California-Irvine, Irvine, California, United States of America
- Department of Biomedical Engineering, University of California-Irvine, Irvine, California, United States of America
| | - Kyoko Yokomori
- Department of Biological Chemistry, University of California-Irvine, Irvine, California, United States of America
| | - Michael W. Berns
- Institute of Engineering in Medicine, University of California-San Diego, San Diego, California, United States of America
- Department of Developmental and Cell Biology, University of California-Irvine, Irvine, California, United States of America
- Beckman Laser Institute, University of California-Irvine, Irvine, California, United States of America
- Department of Biomedical Engineering, University of California-Irvine, Irvine, California, United States of America
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3
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Friedland W, Kundrát P, Schmitt E, Becker J, Li W. MODELING DNA DAMAGE BY PHOTONS AND LIGHT IONS OVER ENERGY RANGES USED IN MEDICAL APPLICATIONS. Radiat Prot Dosimetry 2019; 183:84-88. [PMID: 30535036 DOI: 10.1093/rpd/ncy245] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Accepted: 11/13/2018] [Indexed: 06/09/2023]
Abstract
Comprehensive track structure-based simulations of DNA damage induced in human cells by photons (5 keV-1.3 MeV) and light ions (0.25-512 MeV/u) were performed with PARTRAC. DNA strand breaks, double-strand breaks and their clustering were scored. Effective LET values were established for photons that provide LET-dependent damage yields in agreement with the data for ions. The resulting database captures the variations of biological effectiveness with radiation quality. In particular, it can help compare the effectiveness of conventional radiotherapy using photon beams with techniques relying on proton or ion beams.
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Affiliation(s)
- W Friedland
- Institute of Radiation Protection, Department of Radiation Sciences, Helmholtz Zentrum München-German Research Center for Environmental Health, Ingolstädter Landstr. 1, Neuherberg, Germany
| | - P Kundrát
- Institute of Radiation Protection, Department of Radiation Sciences, Helmholtz Zentrum München-German Research Center for Environmental Health, Ingolstädter Landstr. 1, Neuherberg, Germany
| | - E Schmitt
- Institute of Radiation Protection, Department of Radiation Sciences, Helmholtz Zentrum München-German Research Center for Environmental Health, Ingolstädter Landstr. 1, Neuherberg, Germany
| | - J Becker
- Institute of Radiation Protection, Department of Radiation Sciences, Helmholtz Zentrum München-German Research Center for Environmental Health, Ingolstädter Landstr. 1, Neuherberg, Germany
| | - W Li
- Institute of Radiation Protection, Department of Radiation Sciences, Helmholtz Zentrum München-German Research Center for Environmental Health, Ingolstädter Landstr. 1, Neuherberg, Germany
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4
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Pachnerová Brabcová K, Sihver L, Ukraintsev E, Štěpán V, Davídková M. HOW DETECTION OF PLASMID DNA FRAGMENTATION AFFECTS RADIATION STRAND BREAK YIELDS. Radiat Prot Dosimetry 2019; 183:89-92. [PMID: 30534982 DOI: 10.1093/rpd/ncy222] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Accepted: 11/14/2018] [Indexed: 06/09/2023]
Abstract
A compromised detection of radiation-induced plasmid DNA fragments results in underestimation of calculated damage yields. Electrophoretic methods are easy and cheap, but they can only detect a part of the fragments, neglecting the shortest ones. These can be detected with atomic force microscopy, but at the expense of time and price. Both methods were used to investigate their capabilities to detect the DNA fragments induced by high-energetic heavy ions. The results were taken into account in calculations of radiation-induced yields of single and double strand breaks. It was estimated that the double strand break yield is twice as high when the fragments are at least partially detected with the agarose electrophoresis, compared to when they were completely omitted. Further increase by 13% was observed when the measured fragments were corrected for the fraction of the shortest fragments up to 300 base pairs, as detected with the atomic force microscopy. The effect of fragment detection on the single strand break yield was diminished.
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Affiliation(s)
- Kateřina Pachnerová Brabcová
- Department of Radiation Dosimetry, Nuclear Physics Institute of the Czech Academy of Sciences, Na Truhlářce 39/64, Prague, Czech Republic
| | - Lembit Sihver
- Atominstitut, Technische Universität Wien, Stadionallee 2, Wien, Austria
- MedAustron, Marie-Curie-Straße 5, Wiener Neustadt, Austria
| | - Egor Ukraintsev
- Department of Thin Films and Nanostructures, Institute of Physics of the Czech Academy of Sciences, Cukrovarnická 10/112, Prague, Czech Republic
| | - Václav Štěpán
- Department of Radiation Dosimetry, Nuclear Physics Institute of the Czech Academy of Sciences, Na Truhlářce 39/64, Prague, Czech Republic
| | - Marie Davídková
- Department of Radiation Dosimetry, Nuclear Physics Institute of the Czech Academy of Sciences, Na Truhlářce 39/64, Prague, Czech Republic
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5
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Nakaue H, Obata Y, Kaminaga K, Akimitsu N, Yokoya A. VISUALIZATION OF THE DNA REPAIR PROCESS IN MAMMALIAN CELLS TRANSFECTED WITH EGFP-EXPRESSING PLASMID DNA AFTER EXPOSURE TO X-RAYS IN VITRO. Radiat Prot Dosimetry 2019; 183:79-83. [PMID: 30544250 DOI: 10.1093/rpd/ncy241] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Indexed: 06/09/2023]
Abstract
To investigate the repair process of DNA damage induced by ionizing radiation in isolation from various types of cytoplasmic damage, we transfected X-irradiated enhanced green fluorescent protein (EGFP)-expressing plasmid DNA into non-irradiated mammalian cells using lipofectamine. The repair kinetics of the irradiated plasmids in the cells were visualized under microscopy as the EGFP fluorescence emitted by transfected cells. Using an agarose gel electrophoresis method, the yields of single- and double-strand breaks of the plasmids were also quantified. As positive control experiments, plasmid DNA with single- or double-strand breaks induced by a nicking or restriction enzyme were also transfected into the cells. The DNA repair rates for X-ray-irradiated plasmids were significantly lower than those of the enzymatically digested positive control samples. These results indicate that X-rays could induce less repairable damage than that induced by enzymes.
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Affiliation(s)
- Hiroki Nakaue
- Graduate School of Science and Engineering, Ibaraki University, Mito, Ibaraki, Japan
- Tokai Quantum Beam Science Center, National Institutes for Quantum and Radiological Science and Technology, Tokai, Ibaraki, Japan
| | - Yui Obata
- College of Science, Ibaraki University, Mito, Ibaraki, Japan
| | - Kiichi Kaminaga
- Graduate School of Science and Engineering, Ibaraki University, Mito, Ibaraki, Japan
- Tokai Quantum Beam Science Center, National Institutes for Quantum and Radiological Science and Technology, Tokai, Ibaraki, Japan
| | | | - Akinari Yokoya
- Graduate School of Science and Engineering, Ibaraki University, Mito, Ibaraki, Japan
- Tokai Quantum Beam Science Center, National Institutes for Quantum and Radiological Science and Technology, Tokai, Ibaraki, Japan
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7
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Meyer B, Fabbrizi MR, Raj S, Zobel CL, Hallahan DE, Sharma GG. Histone H3 Lysine 9 Acetylation Obstructs ATM Activation and Promotes Ionizing Radiation Sensitivity in Normal Stem Cells. Stem Cell Reports 2017; 7:1013-1022. [PMID: 27974220 PMCID: PMC5161741 DOI: 10.1016/j.stemcr.2016.11.004] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2016] [Revised: 11/07/2016] [Accepted: 11/08/2016] [Indexed: 01/09/2023] Open
Abstract
Dynamic spatiotemporal modification of chromatin around DNA damage is vital for efficient DNA repair. Normal stem cells exhibit an attenuated DNA damage response (DDR), inefficient DNA repair, and high radiosensitivity. The impact of unique chromatin characteristics of stem cells in DDR regulation is not yet recognized. We demonstrate that murine embryonic stem cells (ES) display constitutively elevated acetylation of histone H3 lysine 9 (H3K9ac) and low H3K9 tri-methylation (H3K9me3). DNA damage-induced local deacetylation of H3K9 was abrogated in ES along with the subsequent H3K9me3. Depletion of H3K9ac in ES by suppression of monocytic leukemia zinc finger protein (MOZ) acetyltransferase improved ATM activation, DNA repair, diminished irradiation-induced apoptosis, and enhanced clonogenic survival. Simultaneous suppression of the H3K9 methyltransferase Suv39h1 abrogated the radioprotective effect of MOZ inhibition, suggesting that high H3K9ac promoted by MOZ in ES cells obstructs local upregulation of H3K9me3 and contributes to muted DDR and increased radiosensitivity.
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Affiliation(s)
- Barbara Meyer
- Cancer Biology Division, Department of Radiation Oncology, Washington University School of Medicine, 4511 Forest Park, Saint Louis, MO 63108, USA
| | - Maria Rita Fabbrizi
- Cancer Biology Division, Department of Radiation Oncology, Washington University School of Medicine, 4511 Forest Park, Saint Louis, MO 63108, USA
| | - Suyash Raj
- Cancer Biology Division, Department of Radiation Oncology, Washington University School of Medicine, 4511 Forest Park, Saint Louis, MO 63108, USA
| | - Cheri L Zobel
- Cancer Biology Division, Department of Radiation Oncology, Washington University School of Medicine, 4511 Forest Park, Saint Louis, MO 63108, USA
| | - Dennis E Hallahan
- Cancer Biology Division, Department of Radiation Oncology, Washington University School of Medicine, 4511 Forest Park, Saint Louis, MO 63108, USA; Siteman Cancer Center, Washington University School of Medicine, Saint Louis, MO 63108, USA
| | - Girdhar G Sharma
- Cancer Biology Division, Department of Radiation Oncology, Washington University School of Medicine, 4511 Forest Park, Saint Louis, MO 63108, USA; Siteman Cancer Center, Washington University School of Medicine, Saint Louis, MO 63108, USA.
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8
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Calcabrini C, De Bellis R, Mancini U, Cucchiarini L, Stocchi V, Potenza L. Protective Effect of Juglans regia L. Walnut Extract Against Oxidative DNA Damage. Plant Foods Hum Nutr 2017; 72:192-197. [PMID: 28401378 DOI: 10.1007/s11130-017-0609-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Walnuts (Juglans regia L.) are relevant components of the Mediterranean diet providing important macronutrients, micronutrients and other bioactive constituents including unsaturated fatty acids, proteins, fiber, vitamins, minerals, phytosterols and polyphenols. Although the walnut beneficial effects in human health are widely recognized by a lot of epidemiologic studies very little is known regarding its effect on damaged DNA. The aim of the present study was to investigate the effect of Juglans regia L. ethanolic extract from kernel on the induction of DNA strand breaks by thiol/Fe3+/O2 mixed function oxidase, tert-butyl hydroperoxide or UVC radiations in acellular and cellular models. Plasmid DNA cleavage and fast Halo assay were used to monitor oxidative damage to DNA. Both approaches showed protection of oxidatively injured DNA. These results agree with a lot of scientific proofs which recommend walnut as dietary adjunct in health promotion and prevention as well as in treatment of lifestyle-related oxidative diseases.
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Affiliation(s)
- Cinzia Calcabrini
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Via A. Saffi 2, I-61029, Urbino, PU, Italy
- Department for Life Quality Studies, Alma Mater Studiorum-University of Bologna, Corso d'Augusto 237, I 47921, Rimini, RN, Italy
| | - Roberta De Bellis
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Via A. Saffi 2, I-61029, Urbino, PU, Italy
| | - Umberto Mancini
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Via A. Saffi 2, I-61029, Urbino, PU, Italy
| | - Luigi Cucchiarini
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Via A. Saffi 2, I-61029, Urbino, PU, Italy
| | - Vilberto Stocchi
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Via A. Saffi 2, I-61029, Urbino, PU, Italy
| | - Lucia Potenza
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Via A. Saffi 2, I-61029, Urbino, PU, Italy.
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9
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Black PJ, Miller AS, Hayes JJ. Radioresistance of GGG sequences to prompt strand break formation from direct-type radiation damage. Radiat Environ Biophys 2016; 55:411-422. [PMID: 27349757 PMCID: PMC5093048 DOI: 10.1007/s00411-016-0660-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2015] [Accepted: 06/19/2016] [Indexed: 06/06/2023]
Abstract
As humans, we are constantly exposed to ionizing radiation from natural, man-made and cosmic sources which can damage DNA, leading to deleterious effects including cancer incidence. In this work, we introduce a method to monitor strand breaks resulting from damage due to the direct effect of ionizing radiation and provide evidence for sequence-dependent effects leading to strand breaks. To analyze only DNA strand breaks caused by radiation damage due to the direct effect of ionizing radiation, we combined an established technique to generate dehydrated DNA samples with a technique to analyze single-strand breaks on short oligonucleotide sequences via denaturing gel electrophoresis. We find that direct damage primarily results in a reduced number of strand breaks in guanine triplet regions (GGG) when compared to isolated guanine (G) bases with identical flanking base context. In addition, we observe strand break behavior possibly indicative of protection of guanine bases when flanked by pyrimidines and sensitization of guanine to strand break when flanked by adenine (A) bases in both isolated G and GGG cases. These observations provide insight into the strand break behavior in GGG regions damaged via the direct effect of ionizing radiation. In addition, this could be indicative of DNA sequences that are naturally more susceptible to strand break due to the direct effect of ionizing radiation.
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Affiliation(s)
- Paul J Black
- Department of Radiation Oncology, Columbia University, New York, NY, 10027, USA
| | - Adam S Miller
- Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT, 06520, USA.
| | - Jeffrey J Hayes
- Department of Biochemistry and Biophysics, University of Rochester, Rochester, NY, 14642, USA
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Souici M, Khalil TT, Boulanouar O, Belafrites A, Mavon C, Fromm M. DNA strand break dependence on Tris and arginine scavenger concentrations under ultra-soft X-ray irradiation: the contribution of secondary arginine radicals. Radiat Environ Biophys 2016; 55:215-228. [PMID: 26994994 DOI: 10.1007/s00411-016-0642-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2015] [Accepted: 03/01/2016] [Indexed: 06/05/2023]
Abstract
In this study, we used a bench-top cold-cathode ultra-soft X-ray (USX) generator to expose aqueous DNA plasmid solutions to low-LET radiation under various scavenging conditions. Single- and double-strand breaks were assessed using classic gel electrophoresis quantification of linear, circular and supercoiled plasmid DNA topologies. With their very low penetration range in water, USX can only interact with matter up to short distances, of the order of 50 μm. We validated a stirring procedure which makes it possible to expose 100 µL of aqueous samples (2 mm thick). The scavenging of OH radicals by Tris buffer was studied at ambient temperature under aerobic conditions and compared to data gathered in the literature. A very good agreement was found with the rare data dealing with DNA plasmid exposed to Al Kα photons at low temperature (T ≤ 277 K), which therefore validated the experimental procedure. The yields for DNA single-strand breaks determined during this study enabled the ratio of indirect to direct effects to be determined at 96.2%, in good agreement with the value of 97.7% stemming from a study based on γ-ray irradiation of frozen solutions of plasmid DNA. Then, arginine was used both to create a "biological-like" chemical environment around the DNA plasmids and as an OH radical scavenger, in vitro. Although arginine has a greater scavenging (protecting) power than Tris, surprisingly, it led to higher rates of strand breakage. Based on the specific binding modes of arginine to DNA, we suggest that the side effects observed are due to the presence of arginine near to, but also inside, the DNA double helix.
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Affiliation(s)
- Mounir Souici
- UMR CNRS 6249 Chrono-Environnement, Université de Bourgogne Franche-Comté, 16 route de Gray, 25030, Besançon Cedex, France
- Laboratoire de Physique des Rayonnements et Applications, Université de Jijel, B.P. 98, 18000, Ouled Aissa, Jijel, Algeria
| | - Talat Tariq Khalil
- UMR CNRS 6249 Chrono-Environnement, Université de Bourgogne Franche-Comté, 16 route de Gray, 25030, Besançon Cedex, France
| | - Omar Boulanouar
- UMR CNRS 6249 Chrono-Environnement, Université de Bourgogne Franche-Comté, 16 route de Gray, 25030, Besançon Cedex, France
| | - Abdelfettah Belafrites
- Laboratoire de Physique des Rayonnements et Applications, Université de Jijel, B.P. 98, 18000, Ouled Aissa, Jijel, Algeria
| | - Christophe Mavon
- UMR CNRS 6249 Chrono-Environnement, Université de Bourgogne Franche-Comté, 16 route de Gray, 25030, Besançon Cedex, France
| | - Michel Fromm
- UMR CNRS 6249 Chrono-Environnement, Université de Bourgogne Franche-Comté, 16 route de Gray, 25030, Besançon Cedex, France.
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Abstract
We have developed a multi target, Low Energy Electron (LEE), precise dose controlled irradiator for biomolecular films. Up to seven samples can be irradiated one after another at any preset electron energy and dose under UHV conditions without venting the chamber. In addition, one more sample goes through all the steps except irradiation, which can be used as control for comparison with the irradiated samples. All the samples are protected against stray electron irradiation by biasing them at -20 V during the entire period, except during irradiation. Ethernet based communication electronics hardware, LEE beam control electronics and computer interface were developed in house. The user Graphical User Interface to control the irradiation and dose measurement was developed using National Instruments Lab Windows CVI. The working and reliability of the dose controlled irradiator has been fully tested over the electron energy range of 0.5 to 500 eV by studying LEE induced single strand breaks to ΦX174 RF1 dsDNA.
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Affiliation(s)
- S V K Kumar
- Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400 005, India
| | - Satej T Tare
- Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400 005, India
| | - Yogesh V Upalekar
- Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400 005, India
| | - Thupten Tsering
- Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400 005, India
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12
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Ouyang S, Song Y, Tian Y, Chen Y, Yu X, Wang D. RNF8 deficiency results in neurodegeneration in mice. Neurobiol Aging 2015; 36:2850-2860. [PMID: 26256786 DOI: 10.1016/j.neurobiolaging.2015.07.010] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2015] [Revised: 07/05/2015] [Accepted: 07/06/2015] [Indexed: 12/21/2022]
Abstract
The progressive loss of neurons causes neurodegenerative diseases. Because the accumulation of DNA breaks results in neuronal apoptosis, the lack of a variety of DNA damage repair-related proteins contributes to neurodegeneration. The ubiquitin ligase RNF8 plays an important role in DNA double-strand break repair via histone ubiquitination. However, the function of RNF8 in terminally differentiated neurons remains unknown. This study aimed to determine whether RNF8 is involved in the DNA damage response in neurons and contributes to neurodegeneration. Here, we present evidence suggesting that RNF8 deficiency results in DNA damage accumulation and neuronal apoptosis. RNF8(-/-) mice exhibit neuronal degeneration and reactive astrocytosis. Neurons from RNF8(-/-) mice appear to be more susceptible to X-ray-induced DNA damage. These changes were consistent with the behavioral performances of the RNF8-deficient mice, which included impaired performances in the open-field test and step-down avoidance task. Overall, these findings show that RNF8 is required for DNA damage repair in neurons. RNF8 deficiency is sufficient to cause neuronal pathology and cognitive decline, and the loss of RNF8 results in neuron degeneration.
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Affiliation(s)
- Siwei Ouyang
- Department of Anatomy and Histology, Lanzhou University School of Basic Medical Sciences, Lanzhou, 730000, China
- Department of Anatomy, Northwest University for Nationalities School of Medicine, Lanzhou, 730030, China
| | - Yanfeng Song
- Department of Anatomy and Histology, Lanzhou University School of Basic Medical Sciences, Lanzhou, 730000, China
| | - Yingxia Tian
- Department of Anatomy and Histology, Lanzhou University School of Basic Medical Sciences, Lanzhou, 730000, China
| | - Yibin Chen
- Department of Internal Medicine, The University of Michigan Medical School, Ann Arbor, MI 48109, USA
| | - Xiaochun Yu
- Department of Internal Medicine, The University of Michigan Medical School, Ann Arbor, MI 48109, USA
| | - Degui Wang
- Department of Anatomy and Histology, Lanzhou University School of Basic Medical Sciences, Lanzhou, 730000, China
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Cortés-Gutiérrez EI, Dávila-Rodríguez MI, Cerda-Flores RM, Fernández JL, López-Fernández C, Gosálvez J. Use of the DBD-FISH technique for detecting DNA breakage in response to high doses of X-rays. Radiat Environ Biophys 2014; 53:713-718. [PMID: 24957017 DOI: 10.1007/s00411-014-0555-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Accepted: 06/13/2014] [Indexed: 06/03/2023]
Abstract
The aim of this study was to generate a dose-response curve using the DNA breakage detection-fluorescent in situ hybridization (DBD-FISH) test as a biomarker of initial genetic effects induced by high doses of X-rays. A dose-response curve was obtained by measuring the ex vivo responses to increasing doses (0-50 Gy) of X-rays in the peripheral blood lymphocytes of ten healthy donors. The overall dose-response curve was constructed using integrated density (ID; area × fluorescence intensity) as a measure of genetic damage induced by irradiation. The correlation coefficient was high (r = 0.934, b(0) = 10.408, and b(1) = 0.094). One-way ANOVA with the Student-Newman-Keuls test for multiple comparisons showed significant differences among the average ln ID values according to dose. Our results suggest the usefulness of the DBD-FISH technique for measuring intrinsic individual cellular radio sensitivity ex vivo.
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Affiliation(s)
- Elva I Cortés-Gutiérrez
- Department of Genetics, Centro de Investigación Biomédica del Noreste, Instituto Mexicano del Seguro Social, IMSS, C.P. 64720, Monterrey, NL, Mexico,
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Mikhailenko VM, Muzalov II. Exogenous nitric oxide potentiate DNA damage and alter DNA repair in cells exposed to ionising radiation. Exp Oncol 2013; 35:318-324. [PMID: 24382445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
UNLABELLED The aim of this study was to investigate impact of exogenous nitric oxide (NO) on generation of different types of DNA damages, their transformation, and specificity of DNA repair in cells treated with ionizing radiation (IR). METHODS levels of single-strand and double-strand breaks assessed in peripheral blood lymphocytes (PBL) isolated from healthy humans and treated in vitro with NO donor -- S-nitrosoglutathione (GSNO) and IR. The rate of DNA repair estimated after 30 and 60 min of PBL treatment. The visualization and measuring the number of prompt and delayed DNA damages, including strand breaks, apurinic and thermolabile sites performed with single-cell gel electrophoresis. RESULTS IR caused dose-dependent generation of single strand breaks (SSBs), double strand breaks (DSBs), and heat-labile sites (HLS) in cell DNA. However, particularly destructive was combined treatment IR with GSNO as NO donor that leads to a significant increase of DNA damage and a dose-dependent inhibition of the DNA repair rate. Obtained data proofs the ability of NO to inhibit fast and slow stages of SSBs, DSBs, and HLS repair resulting in significant growth of genotoxic effect. DNA breaks generation from HLS is able to affect DSBs yields especially in cells with altered DNA repair. The process of DNA repair of delayed DSBs formed from HLS was quite different from removal of DNA damages occurring immediately after treatment and was characterized by IR dose dependent inhibition of DNA repair. CONCLUSION High level of DNA strand breaks, that are generated after the combined treatment with NO and IR, are accumulated for quite a long time after exposure due to altered DNA repair, indicating the development of genetic instability and increase of carcinogenic risk for organism exposed to combination of harmful environmental factors.
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Affiliation(s)
- V M Mikhailenko
- R.E. Kavetsky Institute of Experimental Pathology, Oncology and Radiobiology, NAS of Ukraine, Kyiv 03022, Ukraine
| | - I I Muzalov
- R.E. Kavetsky Institute of Experimental Pathology, Oncology and Radiobiology, NAS of Ukraine, Kyiv 03022, Ukraine
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Crocetti S, Beyer C, Schade G, Egli M, Fröhlich J, Franco-Obregón A. Low intensity and frequency pulsed electromagnetic fields selectively impair breast cancer cell viability. PLoS One 2013; 8:e72944. [PMID: 24039828 PMCID: PMC3770670 DOI: 10.1371/journal.pone.0072944] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2012] [Accepted: 07/22/2013] [Indexed: 01/03/2023] Open
Abstract
INTRODUCTION A common drawback of many anticancer therapies is non-specificity in action of killing. We investigated the potential of ultra-low intensity and frequency pulsed electromagnetic fields (PEMFs) to kill breast cancer cells. Our criteria to accept this technology as a potentially valid therapeutic approach were: 1) cytotoxicity to breast cancer cells and; 2) that the designed fields proved innocuous to healthy cell classes that would be exposed to the PEMFs during clinical treatment. METHODS MCF7 breast cancer cells and their normal counterparts, MCF10 cells, were exposed to PEMFs and cytotoxic indices measured in order to design PEMF paradigms that best kill breast cancer cells. The PEMF parameters tested were: 1) frequencies ranging from 20 to 50 Hz; 2) intensities ranging from 2 mT to 5 mT and; 3) exposure durations ranging from 30 to 90 minutes per day for up to three days to determine the optimum parameters for selective cancer cell killing. RESULTS We observed a discrete window of vulnerability of MCF7 cells to PEMFs of 20 Hz frequency, 3 mT magnitude and exposure duration of 60 minutes per day. The cell damage accrued in response to PEMFs increased with time and gained significance after three days of consecutive daily exposure. By contrast, the PEMFs parameters determined to be most cytotoxic to breast cancer MCF-7 cells were not damaging to normal MCF-10 cells. CONCLUSION Based on our data it appears that PEMF-based anticancer strategies may represent a new therapeutic approach to treat breast cancer without affecting normal tissues in a manner that is non-invasive and can be potentially combined with existing anti-cancer treatments.
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Affiliation(s)
- Sara Crocetti
- Department of Environmental Science, University of Siena, Siena, Italy
- Institute of Biomechanics, Swiss Federal Institute of Technology (ETH), Zurich, Switzerland
| | - Christian Beyer
- Electromagnetic Fields and Microwave Electronics Laboratory, Swiss Federal Institute of Technology (ETH), Zurich, Switzerland
| | - Grit Schade
- Amphasys AG, Technopark Luzern, Root D4, Switzerland
| | - Marcel Egli
- The Center of Competence in Aerospace Biomedical Science and Technology, Lucerne University of Applied Sciences and Arts, Hergiswil, Switzerland
| | - Jürg Fröhlich
- Electromagnetic Fields and Microwave Electronics Laboratory, Swiss Federal Institute of Technology (ETH), Zurich, Switzerland
| | - Alfredo Franco-Obregón
- Institute of Biomechanics, Swiss Federal Institute of Technology (ETH), Zurich, Switzerland
- Department of Surgery, National University Hospital, Singapore, Singapore
- * E-mail:
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Ersson C, Møller P, Forchhammer L, Loft S, Azqueta A, Godschalk RWL, van Schooten FJ, Jones GDD, Higgins JA, Cooke MS, Mistry V, Karbaschi M, Phillips DH, Sozeri O, Routledge MN, Nelson-Smith K, Riso P, Porrini M, Matullo G, Allione A, Stepnik M, Ferlińska M, Teixeira JP, Costa S, Corcuera LA, López de Cerain A, Laffon B, Valdiglesias V, Collins AR, Möller L. An ECVAG inter-laboratory validation study of the comet assay: inter-laboratory and intra-laboratory variations of DNA strand breaks and FPG-sensitive sites in human mononuclear cells. Mutagenesis 2013; 28:279-86. [PMID: 23446176 DOI: 10.1093/mutage/get001] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2024] Open
Abstract
The alkaline comet assay is an established, sensitive method extensively used in biomonitoring studies. This method can be modified to measure a range of different types of DNA damage. However, considerable differences in the protocols used by different research groups affect the inter-laboratory comparisons of results. The aim of this study was to assess the inter-laboratory, intra-laboratory, sample and residual (unexplained) variations in DNA strand breaks and formamidopyrimidine DNA glycosylase (FPG)-sensitive sites measured by the comet assay by using a balanced Latin square design. Fourteen participating laboratories used their own comet assay protocols to measure the level of DNA strand breaks and FPG-sensitive sites in coded samples containing peripheral blood mononuclear cells (PBMC) and the level of DNA strand breaks in coded calibration curve samples (cells exposed to different doses of ionising radiation) on three different days of analysis. Eleven laboratories found dose-response relationships in the coded calibration curve samples on two or three days of analysis, whereas three laboratories had technical problems in their assay. In the coded calibration curve samples, the dose of ionising radiation, inter-laboratory variation, intra-laboratory variation and residual variation contributed to 60.9, 19.4, 0.1 and 19.5%, respectively, of the total variation. In the coded PBMC samples, the inter-laboratory variation explained the largest fraction of the overall variation of DNA strand breaks (79.2%) and the residual variation (19.9%) was much larger than the intra-laboratory (0.3%) and inter-subject (0.5%) variation. The same partitioning of the overall variation of FPG-sensitive sites in the PBMC samples indicated that the inter-laboratory variation was the strongest contributor (56.7%), whereas the residual (42.9%), intra-laboratory (0.2%) and inter-subject (0.3%) variations again contributed less to the overall variation. The results suggest that the variation in DNA damage, measured by comet assay, in PBMC from healthy subjects is assay variation rather than variation between subjects.
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Affiliation(s)
- Clara Ersson
- Department of Biosciences and Nutrition, Karolinska Institutet, Huddinge SE-141 83, Sweden
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17
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Hintzsche H, Jastrow C, Kleine-Ostmann T, Kärst U, Schrader T, Stopper H. Terahertz electromagnetic fields (0.106 THz) do not induce manifest genomic damage in vitro. PLoS One 2012; 7:e46397. [PMID: 23029508 PMCID: PMC3459899 DOI: 10.1371/journal.pone.0046397] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2012] [Accepted: 08/31/2012] [Indexed: 11/18/2022] Open
Abstract
Terahertz electromagnetic fields are non-ionizing electromagnetic fields in the frequency range from 0.1 to 10 THz. Potential applications of these electromagnetic fields include the whole body scanners, which currently apply millimeter waves just below the terahertz range, but future scanners will use higher frequencies in the terahertz range. These and other applications will bring along human exposure to these fields. Up to now, only a limited number of investigations on biological effects of terahertz electromagnetic fields have been performed. Therefore, research is strongly needed to enable reliable risk assessment.Cells were exposed for 2 h, 8 h, and 24 h with different power intensities ranging from 0.04 mW/cm(2) to 2 mW/cm(2), representing levels below, at, and above current safety limits. Genomic damage on the chromosomal level was measured as micronucleus formation. DNA strand breaks and alkali-labile sites were quantified with the comet assay. No DNA strand breaks or alkali-labile sites were observed as a consequence of exposure to terahertz electromagnetic fields in the comet assay. The fields did not cause chromosomal damage in the form of micronucleus induction.
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Affiliation(s)
- Henning Hintzsche
- Institut für Pharmakologie und Toxikologie, Universität Würzburg, Würzburg, Germany
| | | | | | - Uwe Kärst
- Helmholtz-Zentrum für Infektionsforschung, Braunschweig, Germany
| | | | - Helga Stopper
- Institut für Pharmakologie und Toxikologie, Universität Würzburg, Würzburg, Germany
- * E-mail:
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Rezaee M, Cloutier P, Bass AD, Michaud M, Hunting DJ, Sanche L. Absolute cross section for low-energy-electron damage to condensed macromolecules: a case study of DNA. Phys Rev E Stat Nonlin Soft Matter Phys 2012; 86:031913. [PMID: 23030950 PMCID: PMC3815646 DOI: 10.1103/physreve.86.031913] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2012] [Revised: 08/24/2012] [Indexed: 06/01/2023]
Abstract
Cross sections (CSs) for the interaction of low-energy electrons (LEE) with condensed macromolecules are essential parameters for accurate modeling of radiation-induced molecular decomposition and chemical synthesis. Electron irradiation of dry nanometer-scale macromolecular solid films has often been employed to measure CSs and other quantitative parameters for LEE interactions. Since such films have thicknesses comparable with electron thermalization distances, energy deposition varies throughout the film. Moreover, charge accumulation occurring inside the films shields a proportion of the macromolecules from electron irradiation. Such effects complicate the quantitative comparison of the CSs obtained in films of different thicknesses and limit the applicability of such measurements. Here, we develop a simple mathematical model, termed the molecular survival model, that employs a CS for a particular damage process together with an attenuation length related to the total CS, to investigate how a measured CS might be expected to vary with experimental conditions. As a case study, we measure the absolute CS for the formation of DNA strand breaks (SBs) by electron irradiation at 10 and 100 eV of lyophilized plasmid DNA films with thicknesses between 10 and 30 nm. The measurements are shown to depend strongly on the thickness and charging condition of the nanometer-scale films. Such behaviors are in accord with the model and support its validity. Via this analysis, the CS obtained for SB damage is nearly independent of film thickness and charging effects. In principle, this model can be adapted to provide absolute CSs for electron-induced damage or reactions occurring in other molecular solids across a wider range of experimental conditions.
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Affiliation(s)
- Mohammad Rezaee
- Groupe en Sciences des Radiations, Départment de Médecine Nucléaire et Radiobiologie, Faculté de Médecine et des Sciences de la Santé, Université de Sherbrooke, Sherbrooke, Québec, Canada J1H 5N4.
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Khan SR, Kuzminov A. Replication forks stalled at ultraviolet lesions are rescued via RecA and RuvABC protein-catalyzed disintegration in Escherichia coli. J Biol Chem 2012; 287:6250-65. [PMID: 22194615 PMCID: PMC3307332 DOI: 10.1074/jbc.m111.322990] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2011] [Revised: 12/09/2011] [Indexed: 11/06/2022] Open
Abstract
Ultraviolet (UV) irradiation is not known to induce chromosomal fragmentation in sublethal doses, and yet UV irradiation causes genetic instability and cancer, suggesting that chromosomes are fragmented. Here we show that UV irradiation induces fragmentation in sublethal doses, but the broken chromosomes are repaired or degraded by RecBCD; therefore, to observe full fragmentation, RecBCD enzyme needs to be inactivated. Using quantitative pulsed field gel electrophoresis and sensitive DNA synthesis measurements, we investigated the mechanisms of UV radiation-induced chromosomal fragmentation in recBC mutants, comparing five existing models of DNA damage-induced fragmentation. We found that fragmentation depends on active DNA synthesis before, but not after, UV irradiation. At low UV irradiation doses, fragmentation does not need excision repair or daughter strand gap repair. Fragmentation absolutely depends on both RecA-catalyzed homologous strand exchange and RuvABC-catalyzed Holliday junction resolution. Thus, chromosomes fragment when replication forks stall at UV lesions and regress, generating Holliday junctions. Remarkably, cells specifically utilize fork breakage to rescue stalled replication and avoid lethality.
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Affiliation(s)
- Sharik R. Khan
- From the Department of Microbiology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
| | - Andrei Kuzminov
- From the Department of Microbiology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
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20
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Osipov AN, Riabchenko NI, Ivannik BP, Riabchenko VI. [DNA damage in thymocytes of mice under combined acute whole body exposure to cadmium ions and gamma-radiation]. Radiats Biol Radioecol 2011; 51:315-320. [PMID: 21866830] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The effect of the combined acute whole body exposure to cadmium chloride (0.5 mg Cd2+ per kg body weight of animals) and gamma-radiation (1 Gy) on the DNA damage induction in thymocytes and thymic cellularity of mice was studied. It has been shown that CdCl2 solution injection 0.5 h before irradiation reduces the quantity of single-strand DNA breaks and alkali-labile sites in thymocytes 48 h after injection compared to gamma-radiation action only. The observed effect is accompanied by a sharp decrease of the thymic cellularity compared with the separate effects of both cadmium ions and irradiation, which masks the overall genotoxic effect of combined exposure and gives an illusion of cadmiumL ions radioprotective action. Cadmium chloride injection 24 h before irradiation leads to a significant additive increase in the single-strand DNA breaks and alkali-labile sites number as compared to the separate effects of cadmium ions and irradiation alone. At the same time the decrease in the percentage of DNA tightly bound to proteins (DNA-protein cross-links) was noted in comparison with the action of gamma-radiation only. Statistically significant changes in thymic cellularity compared with separate effects of cadmium ions and irradiation were not found. Thus, our research has shown that under a combined action of cadmium ions and gamma-radiation on thymocytes in mice at the applied doses and exposure schemes the additive effects, rather than antagonism or radioprotective effects are observed.
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Hennequin C. [Why is ionizing radiation therapeutic?]. Rev Prat 2011; 61:74-75. [PMID: 21452550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
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Brem R, Li F, Montaner B, Reelfs O, Karran P. DNA breakage and cell cycle checkpoint abrogation induced by a therapeutic thiopurine and UVA radiation. Oncogene 2010; 29:3953-63. [PMID: 20440263 PMCID: PMC2901207 DOI: 10.1038/onc.2010.140] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2009] [Revised: 03/05/2010] [Accepted: 03/18/2010] [Indexed: 12/13/2022]
Abstract
The frequency of squamous cell skin carcinoma in organ transplant patients is around 100-fold higher than normal. This dramatic example of therapy-related cancer reflects exposure to sunlight and to immunosuppressive drugs. Here, we show that the interaction between low doses of UVA, the major ultraviolet component of incident sunlight, and 6-TG, a UVA chromophore that is introduced into DNA by one of the most widely prescribed immunosuppressive drugs, causes DNA single- and double-strand breaks (DSB). S phase cells are particularly vulnerable to this DNA breakage and cells defective in rejoining of S-phase DSB are hypersensitive to the combination of low-dose UVA and DNA 6-TG. 6-TG/UVA-induced DNA lesions provoke canonical DNA damage responses involving activation of the ATM/Chk2 and ATR/Chk1 pathways and appropriate cell cycle checkpoints. Higher levels of photochemical DNA damage induce a proteasome-mediated degradation of Chk1 and checkpoint abrogation that is consistent with persistent unrepaired DNA damage. These findings indicate that the interaction between UVA and an immunosuppressant drug causes photochemical DNA lesions, including DNA breaks, and can compromise cell cycle checkpoints. These two properties could contribute to the high risk of sunlight-related skin cancer in long-term immunosuppressed patients.
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Affiliation(s)
| | | | - Beatriz Montaner
- Cancer Research UK London Research Institute, Clare Hall Laboratories, South Mimms, Herts EN6 3LD
| | | | - Peter Karran
- Cancer Research UK London Research Institute, Clare Hall Laboratories, South Mimms, Herts EN6 3LD
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Zhang L, Tan Z. A new calculation on spectrum of direct DNA damage induced by low-energy electrons. Radiat Environ Biophys 2010; 49:15-26. [PMID: 20039050 DOI: 10.1007/s00411-009-0262-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2009] [Accepted: 12/11/2009] [Indexed: 05/28/2023]
Abstract
In this work, direct DNA damage induced by low-energy electrons (<5 keV) is simulated using Monte Carlo methods, and the resulting yield of various strand breaks and base damages in cellular environment is presented. The simulation is based on a new inelastic cross section for the production of electron track structure in liquid water, and on ionization cross sections of DNA bases to generate base radical. Especially, a systematic approach of simulating detailed base damage is suggested. This approach includes improvement of a volume model of DNA, generation of the DNA base sequence, conversion of ionization events in liquid water at hit site to the ionization interaction of electrons with DNA bases and development of an algorithm to convert a base radical to a damage. The results obtained in terms of strand breaks are compared with those of experiments and other theoretical calculations, and good agreement was obtained. The yield of detailed base damages and clustered DNA damages caused by the combination of various strand breaks and base damages is presented, and the corresponding distribution characteristics are analyzed. The influence of the relative content of base pairs A-T and G-C in a DNA segment on the yield of both strand breaks and base damages is also explored. The present work provides fundamental information on DNA damage and represents the first effort toward the goal of obtaining the spectrum of clustered DNA damage including detailed base damages, for the mechanistic interpretation and prediction of radiation effects.
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Affiliation(s)
- Liming Zhang
- School of Electrical Engineering, Shandong University, Southern Campus, 250061, Jinan, Shandong, People's Republic of China
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Wyer JA, Butterworth KT, Hirst DG, Latimer CJ, Montenegro EC, Shah MB, Currell FJ. Fragmentation and plasmid strand breaks in pure and gold-doped DNA irradiated by beams of fast hydrogen atoms. Phys Med Biol 2009; 54:4705-21. [PMID: 19590119 DOI: 10.1088/0031-9155/54/15/005] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The results of an investigation into the damage caused to dry plasmid DNA after irradiation by fast (keV) hydrogen atoms are presented. Agarose gel electrophoresis was used to assess single and double strand break yields as a function of dose in dry DNA samples deposited on a mica substrate. Damage levels were observed to increase with beam energy. Strand break yields demonstrated a considerable dependence on sample structure and the method of sample preparation. Additionally, the effect of high-Z nanoparticles on damage levels was investigated by irradiating DNA samples containing controlled amounts of gold nanoparticles. In contrast to previous (photonic) studies, no enhancement of strand break yields was observed with the particles showing a slight radioprotective effect. A model of DNA damage as a function of dose has been constructed in terms of the probability for the creation of single and double strand breaks, per unit ion flux. This model provides quantitative conclusions about the effects of both gold nanoparticles and the different buffers used in performing the assays and, in addition, infers the proportion of multiply damaged fragments.
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Affiliation(s)
- J A Wyer
- Centre for Plasma Physics, IRCEP, Queen's University Belfast, BT7 1NN, UK.
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Abstract
The recognition and repair of DNA lesions occurs within a chromatin environment. Genetically tagging fluorescent proteins to DNA damage response proteins has provided spatial and temporal details concerning the establishment of biochemical subnuclear regions geared toward metabolizing genomic lesions. A specific marker for chromatin regions containing DNA breaks is required to study the initial dynamic structural changes in chromatin when DNA breaks occur. Here we present the experimental protocols used to investigate the dynamics of chromatin structure immediately after the simultaneous photoactivation of PAGFP-tagged core histone H2B and introduction of DNA breaks using UVA laser microirradiation on a laser scanning confocal microscope.
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Affiliation(s)
- Michael J Kruhlak
- Experimental Immunology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
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Lizunova EI, Vorob'eva NI, Osipov AN. [Influence of chronic exposure to low doses of gamma-radiation and 90Sr on the level of DNA breaks and cell sensitivity to hydrogen peroxide in the mouse spleen]. Izv Akad Nauk Ser Biol 2008:409-413. [PMID: 18771022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Using comet assay, a statistically significant increase (p < 0.05) in the level of DNA breaks in spleen cells was revealed in male CBA/lac mice exposed to gamma-radiation (1.7 cGy/day) or 90Sr (150-250 Bq/day) for 210 days. The level of DNA breaks also increased under combined exposure to both gamma-radiation and 90Sr (p < 0.05), but to a lesser degree than under exposure to each of these factors alone. Upon additional in vitro treatment of spleen cells with hydrogen peroxide, the relative increase in the level of DNA breaks was smaller in cells of irradiated mice than in the control. The ratio of the level of DNA breaks after hydrogen peroxide treatment to that before this treatment in control mice was 4.2 +/- 0.9, compared to 1.4 +/- 0.6 in gamma-irradiated mice, 1.9 +/- 0.8 in 90Sr-irradiated mice, and 2.3 +/- 0.8 in mice exposed to both gamma- and 90Sr-irradiation.
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Kabat GC, Rohan TE. Does excess iron play a role in breast carcinogenesis? An unresolved hypothesis. Cancer Causes Control 2007; 18:1047-53. [PMID: 17823849 DOI: 10.1007/s10552-007-9058-9] [Citation(s) in RCA: 89] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2007] [Accepted: 08/20/2007] [Indexed: 12/11/2022]
Abstract
Free iron is a pro-oxidant and can induce oxidative stress and DNA damage. The carcinogenicity of iron has been demonstrated in animal models, and epidemiologic studies have shown associations with several human cancers. However, a possible role of excess body iron stores or of elevated iron intake in breast carcinogenesis has received little attention epidemiologically. We propose that iron overload and the disruption of iron homeostasis with a resulting increase in free iron may contribute to the development of breast cancer, and we summarize the relevant evidence from mechanistic studies, animal experiments, and studies in humans. Over time a high intake of iron can lead to iron overload. Furthermore, body iron stores increase in women following menopause. Reactive oxygen species produced by normal aerobic cellular metabolism can lead to the release of free iron from ferritin. In the presence of superoxide radical and hydrogen peroxide, stored ferric iron (Fe(3+)) is reduced to ferrous iron (Fe(2+)), which catalyzes the formation of the hydroxyl radical (*OH). *OH in turn can promote lipid peroxidation, mutagenesis, DNA strand breaks, oncogene activation, and tumor suppressor inhibition, increasing the risk of breast cancer. In addition to its independent role as a proxidant, high levels of free iron may potentiate the effects of estradiol, ethanol, and ionizing radiation - three established risk factors for breast cancer. In order to identify the role of iron in breast carcinogenesis, improved biomarkers of body iron stores are needed, as are cohort studies which assess heme iron intake. Ultimately, it is important to determine whether iron levels in the breast and iron-induced pathology are higher in women who go on to develop breast cancer compared to women who do not.
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Affiliation(s)
- Geoffrey C Kabat
- Department of Epidemiology and Population Health, Albert Einstein College of Medicine, NY 10461, USA..
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