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Huseman ED, Lo A, Fedorova O, Elia JL, Gueble SE, Lin K, Sundaram RK, Oh J, Liu J, Menges F, Rees MG, Ronan MM, Roth JA, Batista VS, Crawford JM, Pyle AM, Bindra RS, Herzon SB. Mechanism of Action of KL-50, a Candidate Imidazotetrazine for the Treatment of Drug-Resistant Brain Cancers. J Am Chem Soc 2024; 146:18241-18252. [PMID: 38815248 DOI: 10.1021/jacs.3c06483] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2024]
Abstract
Aberrant DNA repair is a hallmark of cancer, and many tumors display reduced DNA repair capacities that sensitize them to genotoxins. Here, we demonstrate that the differential DNA repair capacities of healthy and transformed tissue may be exploited to obtain highly selective chemotherapies. We show that the novel N3-(2-fluoroethyl)imidazotetrazine "KL-50" is a selective toxin toward tumors that lack the DNA repair protein O6-methylguanine-DNA-methyltransferase (MGMT), which reverses the formation of O6-alkylguanine lesions. We establish that KL-50 generates DNA interstrand cross-links (ICLs) by a multistep process comprising DNA alkylation to generate an O6-(2-fluoroethyl)guanine (O6FEtG) lesion, slow unimolecular displacement of fluoride to form an N1,O6-ethanoguanine (N1,O6EtG) intermediate, and ring-opening by the adjacent cytidine. The slow rate of N1,O6EtG formation allows healthy cells expressing MGMT to reverse the initial O6FEtG lesion before it evolves to N1,O6EtG, thereby suppressing the formation of toxic DNA-MGMT cross-links and reducing the amount of DNA ICLs generated in healthy cells. In contrast, O6-(2-chloroethyl)guanine lesions produced by agents such as lomustine and the N3-(2-chloroethyl)imidazotetrazine mitozolomide rapidly evolve to N1,O6EtG, resulting in the formation of DNA-MGMT cross-links and DNA ICLs in healthy tissue. These studies suggest that careful consideration of the rates of chemical DNA modification and biochemical DNA repair may lead to the identification of other tumor-specific genotoxic agents.
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Affiliation(s)
- Eric D Huseman
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Anna Lo
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Olga Fedorova
- Department of Molecular, Cellular, and Developmental Biology, Yale University, New Haven, Connecticut 06520, United States
- Howard Hughes Medical Institute, New Haven, Connecticut 06520, United States
| | - James L Elia
- Department of Pathology, Yale School of Medicine, New Haven, Connecticut 06520, United States
| | - Susan E Gueble
- Department of Therapeutic Radiology, Yale School of Medicine, New Haven, Connecticut 06520, United States
| | - Kingson Lin
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
- Department of Pathology, Yale School of Medicine, New Haven, Connecticut 06520, United States
- Department of Therapeutic Radiology, Yale School of Medicine, New Haven, Connecticut 06520, United States
| | - Ranjini K Sundaram
- Department of Therapeutic Radiology, Yale School of Medicine, New Haven, Connecticut 06520, United States
| | - Joonseok Oh
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
- Institute of Biomolecular Design & Discovery, Yale University, West Haven, Connecticut 06516, United States
| | - Jinchan Liu
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Fabian Menges
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
- Department of Chemistry, Chemical and Biophysical Instrumentation Center, Yale University, New Haven, Connecticut 06520, United States
| | - Matthew G Rees
- Broad Institute of MIT and Harvard; Cambridge, Massachusetts 02142, United States
| | - Melissa M Ronan
- Broad Institute of MIT and Harvard; Cambridge, Massachusetts 02142, United States
| | - Jennifer A Roth
- Broad Institute of MIT and Harvard; Cambridge, Massachusetts 02142, United States
| | - Victor S Batista
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Jason M Crawford
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
- Department of Chemistry, Chemical and Biophysical Instrumentation Center, Yale University, New Haven, Connecticut 06520, United States
- Department of Microbial Pathogenesis, Yale School of Medicine; New Haven, Connecticut 06520, United States
| | - Anna M Pyle
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
- Department of Molecular, Cellular, and Developmental Biology, Yale University, New Haven, Connecticut 06520, United States
- Howard Hughes Medical Institute, New Haven, Connecticut 06520, United States
| | - Ranjit S Bindra
- Department of Pathology, Yale School of Medicine, New Haven, Connecticut 06520, United States
- Department of Therapeutic Radiology, Yale School of Medicine, New Haven, Connecticut 06520, United States
| | - Seth B Herzon
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
- Department of Therapeutic Radiology, Yale School of Medicine, New Haven, Connecticut 06520, United States
- Department of Pharmacology, Yale School of Medicine; New Haven, Connecticut 06520, United States
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Standards for Quantitative Measurement of DNA Damage in Mammalian Cells. Int J Mol Sci 2023; 24:ijms24065427. [PMID: 36982502 PMCID: PMC10051712 DOI: 10.3390/ijms24065427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 03/07/2023] [Accepted: 03/09/2023] [Indexed: 03/18/2023] Open
Abstract
As the potential applications of DNA diagnostics continue to expand, there is a need for improved methods and standards for DNA analysis. This report describes several methods that could be considered for the production of reference materials for the quantitative measurement of DNA damage in mammalian cells. With the focus on DNA strand breaks, potentially useful methods for assessing DNA damage in mammalian cells are reviewed. The advantages and limitations of each method, as well as additional concerns with respect to reference material development, are also discussed. In conclusion, we outline strategies for developing candidate DNA damage reference materials that could be adopted by research laboratories in a wide variety of applications.
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Lin K, Gueble SE, Sundaram RK, Huseman ED, Bindra RS, Herzon SB. Mechanism-based design of agents that selectively target drug-resistant glioma. Science 2022; 377:502-511. [PMID: 35901163 PMCID: PMC9502022 DOI: 10.1126/science.abn7570] [Citation(s) in RCA: 42] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Approximately half of glioblastoma and more than two-thirds of grade II and III glioma tumors lack the DNA repair protein O6-methylguanine methyl transferase (MGMT). MGMT-deficient tumors respond initially to the DNA methylation agent temozolomide (TMZ) but frequently acquire resistance through loss of the mismatch repair (MMR) pathway. We report the development of agents that overcome this resistance mechanism by inducing MMR-independent cell killing selectively in MGMT-silenced tumors. These agents deposit a dynamic DNA lesion that can be reversed by MGMT but slowly evolves into an interstrand cross-link in MGMT-deficient settings, resulting in MMR-independent cell death with low toxicity in vitro and in vivo. This discovery may lead to new treatments for gliomas and may represent a new paradigm for designing chemotherapeutics that exploit specific DNA repair defects.
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Affiliation(s)
- Kingson Lin
- Department of Chemistry, Yale University, New Haven, CT 06520, USA
- Department of Therapeutic Radiology, Yale School of Medicine, New Haven, CT 06520, USA
- Department of Pathology, Yale School of Medicine, New Haven, CT 06520, USA
| | - Susan E. Gueble
- Department of Therapeutic Radiology, Yale School of Medicine, New Haven, CT 06520, USA
| | - Ranjini K. Sundaram
- Department of Therapeutic Radiology, Yale School of Medicine, New Haven, CT 06520, USA
| | - Eric D. Huseman
- Department of Chemistry, Yale University, New Haven, CT 06520, USA
| | - Ranjit S. Bindra
- Department of Therapeutic Radiology, Yale School of Medicine, New Haven, CT 06520, USA
- Department of Pathology, Yale School of Medicine, New Haven, CT 06520, USA
- Corresponding author. (S.B.H.); (R.S.B.)
| | - Seth B. Herzon
- Department of Chemistry, Yale University, New Haven, CT 06520, USA
- Department of Pharmacology, Yale School of Medicine, New Haven, CT 06520, USA
- Corresponding author. (S.B.H.); (R.S.B.)
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Jalili P, Huet S, Burel A, Krause BC, Fontana C, Chevance S, Gauffre F, Guichard Y, Lampen A, Laux P, Luch A, Hogeveen K, Fessard V. Genotoxic impact of aluminum-containing nanomaterials in human intestinal and hepatic cells. Toxicol In Vitro 2021; 78:105257. [PMID: 34688838 DOI: 10.1016/j.tiv.2021.105257] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 09/28/2021] [Accepted: 10/08/2021] [Indexed: 11/27/2022]
Abstract
Exposure of consumers to aluminum-containing nanomaterials (Al NMs) is an area of concern for public health agencies. As the available data on the genotoxicity of Al2O3 and Al0 NMs are inconclusive or rare, the present study investigated their in vitro genotoxic potential in intestinal and liver cell models, and compared with the ionic form AlCl3. Intestinal Caco-2 and hepatic HepaRG cells were exposed to Al0 and Al2O3 NMs (0.03 to 80 μg/cm2). Cytotoxicity, oxidative stress and apoptosis were measured using High Content Analysis. Genotoxicity was investigated through γH2AX labelling, the alkaline comet and micronucleus assays. Moreover, oxidative DNA damage and carcinogenic properties were assessed using the Fpg-modified comet assay and the cell transforming assay in Bhas 42 cells respectively. The three forms of Al did not induce chromosomal damage. However, although no production of oxidative stress was detected, Al2O3 NMs induced oxidative DNA damage in Caco-2 cells but not likely related to ion release in the cell media. Considerable DNA damage was observed with Al0 NMs in both cell lines in the comet assay, likely due to interference with these NMs. No genotoxic effects were observed with AlCl3. None of the Al compounds induced cytotoxicity, apoptosis, γH2AX or cell transformation.
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Affiliation(s)
- Pégah Jalili
- ANSES, French Agency for Food, Environmental and Occupational Health & Safety, Fougères Laboratory, Toxicology of Contaminants Unit, 10B rue C. Bourgelat, 35306 Fougères, France
| | - Sylvie Huet
- ANSES, French Agency for Food, Environmental and Occupational Health & Safety, Fougères Laboratory, Toxicology of Contaminants Unit, 10B rue C. Bourgelat, 35306 Fougères, France
| | - Agnès Burel
- MRic Cell Imaging Platform, BIOSIT, University of Rennes 1, campus Santé de Villejean, 2 avenue du Pr Léon Bernard - CS, 34317, 35043 Rennes, France
| | - Benjamin-Christoph Krause
- Federal Institute for Risk Assessment (BfR), Department of Chemical and Product Safety, Max-Dohrn-Straße 8-10, 10589 Berlin, Germany
| | - Caroline Fontana
- INRS, 1, rue du Morvan - CS 60027, 54519 Vandoeuvre les Nancy, France
| | - Soizic Chevance
- Université de Rennes 1, CNRS, ISCR (Institut des Sciences Chimiques de Rennes)-UMR6226, F-35000 Rennes, France
| | - Fabienne Gauffre
- Université de Rennes 1, CNRS, ISCR (Institut des Sciences Chimiques de Rennes)-UMR6226, F-35000 Rennes, France
| | - Yves Guichard
- INRS, 1, rue du Morvan - CS 60027, 54519 Vandoeuvre les Nancy, France
| | - Alfonso Lampen
- Federal Institute for Risk Assessment (BfR), Max-Dohrn-Straße 8-10, 10589 Berlin, Germany
| | - Peter Laux
- Federal Institute for Risk Assessment (BfR), Department of Chemical and Product Safety, Max-Dohrn-Straße 8-10, 10589 Berlin, Germany
| | - Andreas Luch
- Federal Institute for Risk Assessment (BfR), Department of Chemical and Product Safety, Max-Dohrn-Straße 8-10, 10589 Berlin, Germany
| | - Kevin Hogeveen
- ANSES, French Agency for Food, Environmental and Occupational Health & Safety, Fougères Laboratory, Toxicology of Contaminants Unit, 10B rue C. Bourgelat, 35306 Fougères, France
| | - Valérie Fessard
- ANSES, French Agency for Food, Environmental and Occupational Health & Safety, Fougères Laboratory, Toxicology of Contaminants Unit, 10B rue C. Bourgelat, 35306 Fougères, France.
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Tahara H, Yamagiwa Y, Haranosono Y, Kurata M. In vivo comet assay in rabbit corneal epithelial cells following ocular instillation with genotoxic compounds. Genes Environ 2021; 43:11. [PMID: 33827709 PMCID: PMC8028091 DOI: 10.1186/s41021-021-00184-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2021] [Accepted: 03/27/2021] [Indexed: 11/22/2022] Open
Abstract
Background The in vivo comet assay is used to evaluate the genotoxic potential of compounds by detecting DNA strand breaks in cells isolated from animal tissue. The comet assay of hepatocytes is well established; however, the levels of systemic drug exposure following systemic administration are often insufficient to evaluate the genotoxic potential of compounds on the ocular surface following ocular instillation. To investigate the possibility of using the comet assay as a genotoxic evaluation tool for the ocular surface, we performed this assay on the corneal epithelial cells of rabbit eyes 2 h after the single ocular instillation of five genotoxic compounds, namely ethidium bromide, 1,1′-dimethyl-4,4′-bipyridinium dichloride (paraquat), methyl methanesulfonate (MMS), acrylamide, and 4-nitroquinoline 1-oxide (4-NQO). Results The mean % tail DNA, as an indicator of DNA damage, in the corneal epithelial cells treated with ethidium bromide, MMS, and 4-NQO exhibited statistically significant increases compared with those in the negative controls (saline or 5 % dimethyl sulfoxide in saline). However, paraquat and acrylamide did not increase the mean % tail DNA, presumably because of the high antioxidant levels and low cytochrome P450 levels present in the corneal epithelium, respectively. Conclusions The comet assay was able to detect genotoxic potential on the ocular surface following ocular instillation with genotoxic compounds. The study findings indicate that the in vivo comet assay may provide a useful tool for assessing the genotoxicity of compounds topically administrated on the ocular surface under mimicking clinical condition.
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Affiliation(s)
- Haruna Tahara
- Research & Development Division, Senju Pharmaceutical Co., Ltd, 6-4-3, Minatojima-Minamimachi, Chuo-Ku, Kobe, Hyogo, 650-0047, Japan.
| | - Yoshinori Yamagiwa
- Research & Development Division, Senju Pharmaceutical Co., Ltd, 6-4-3, Minatojima-Minamimachi, Chuo-Ku, Kobe, Hyogo, 650-0047, Japan
| | - Yu Haranosono
- Research & Development Division, Senju Pharmaceutical Co., Ltd, 6-4-3, Minatojima-Minamimachi, Chuo-Ku, Kobe, Hyogo, 650-0047, Japan
| | - Masaaki Kurata
- Research & Development Division, Senju Pharmaceutical Co., Ltd, 6-4-3, Minatojima-Minamimachi, Chuo-Ku, Kobe, Hyogo, 650-0047, Japan
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Jalili P, Huet S, Lanceleur R, Jarry G, Hegarat LL, Nesslany F, Hogeveen K, Fessard V. Genotoxicity of Aluminum and Aluminum Oxide Nanomaterials in Rats Following Oral Exposure. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E305. [PMID: 32053952 PMCID: PMC7075173 DOI: 10.3390/nano10020305] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/09/2020] [Revised: 01/27/2020] [Accepted: 02/02/2020] [Indexed: 02/06/2023]
Abstract
Due to several gaps remaining in the toxicological evaluation of nanomaterials (NMs), consumers and public health agencies have shown increasing concern for human health protection. In addition to aluminum (Al) microparticles, Al-containing nanomaterials (Al NMs) have been applied by food industry as additives and contact materials. Due to the limited amount of literature on the toxicity of Al NMs, this study aimed to evaluate the in vivo genotoxic potential of Al0 and Al2O3 NMs after acute oral exposure. Male Sprague-Dawley rats were administered three successive gavages at 6, 12.5 and 25 mg/kg bw. A comparison with AlCl3 was done in order to assess the potential effect of dissolution into Al ions. Both DNA strand breaks and oxidative DNA damage were investigated in six organs/tissues (duodenum, liver, kidney, spleen, blood and bone marrow) with the alkaline and the Fpg-modified comet assays. Concomitantly, chromosomal damage was investigated in bone marrow and colon with the micronucleus assay. The comet assay only showed DNA damage with Al2O3 NMs in bone marrow (BM), while AlCl3 induced slight but non-significant oxidative DNA damage in blood. No increase of chromosomal mutations was observed after treatment with the two Al MNs either in the BM or in the colons of rats.
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Affiliation(s)
- Pégah Jalili
- Unité de Toxicologie des Contaminants, Agence Nationale de Sécurité Sanitaire (ANSES), 10 B rue Claude Bourgelat, 35306 Fougères, France (S.H.); (R.L.); (G.J.); (L.L.H.); (K.H.)
| | - Sylvie Huet
- Unité de Toxicologie des Contaminants, Agence Nationale de Sécurité Sanitaire (ANSES), 10 B rue Claude Bourgelat, 35306 Fougères, France (S.H.); (R.L.); (G.J.); (L.L.H.); (K.H.)
| | - Rachelle Lanceleur
- Unité de Toxicologie des Contaminants, Agence Nationale de Sécurité Sanitaire (ANSES), 10 B rue Claude Bourgelat, 35306 Fougères, France (S.H.); (R.L.); (G.J.); (L.L.H.); (K.H.)
| | - Gérard Jarry
- Unité de Toxicologie des Contaminants, Agence Nationale de Sécurité Sanitaire (ANSES), 10 B rue Claude Bourgelat, 35306 Fougères, France (S.H.); (R.L.); (G.J.); (L.L.H.); (K.H.)
| | - Ludovic Le Hegarat
- Unité de Toxicologie des Contaminants, Agence Nationale de Sécurité Sanitaire (ANSES), 10 B rue Claude Bourgelat, 35306 Fougères, France (S.H.); (R.L.); (G.J.); (L.L.H.); (K.H.)
| | - Fabrice Nesslany
- Institut Pasteur de Lille, Laboratoire de toxicologie génétique, 1 Rue du Professeur Calmette, 59019 Lille CEDEX, France;
| | - Kevin Hogeveen
- Unité de Toxicologie des Contaminants, Agence Nationale de Sécurité Sanitaire (ANSES), 10 B rue Claude Bourgelat, 35306 Fougères, France (S.H.); (R.L.); (G.J.); (L.L.H.); (K.H.)
| | - Valérie Fessard
- Unité de Toxicologie des Contaminants, Agence Nationale de Sécurité Sanitaire (ANSES), 10 B rue Claude Bourgelat, 35306 Fougères, France (S.H.); (R.L.); (G.J.); (L.L.H.); (K.H.)
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Hobbs CA, Koyanagi M, Swartz C, Davis J, Maronpot R, Recio L, Hayashi SM. Genotoxicity evaluation of the naturally-derived food colorant, gardenia blue, and its precursor, genipin. Food Chem Toxicol 2018; 118:695-708. [DOI: 10.1016/j.fct.2018.06.001] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Revised: 05/30/2018] [Accepted: 06/01/2018] [Indexed: 11/16/2022]
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Ratan ZA, Zaman SB, Mehta V, Haidere MF, Runa NJ, Akter N. Application of Fluorescence In Situ Hybridization (FISH) Technique for the Detection of Genetic Aberration in Medical Science. Cureus 2017; 9:e1325. [PMID: 28690958 PMCID: PMC5501716 DOI: 10.7759/cureus.1325] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Fluorescence in situ hybridization (FISH) is a macromolecule recognition technique, which is considered as a new advent in the field of cytology. Initially, it was developed as a physical mapping tool to delineate genes within chromosomes. The accuracy and versatility of FISH were subsequently capitalized upon in biological and medical research. This visually appealing technique provides an intermediate degree of resolution between DNA analysis and chromosomal investigations. FISH consists of a hybridizing DNA probe, which can be labeled directly or indirectly. In the case of direct labeling, fluorescent nucleotides are used, while indirect labeling is incorporated with reporter molecules that are subsequently detected by fluorescent antibodies or other affinity molecules. FISH is applied to detect genetic abnormalities that include different characteristic gene fusions or the presence of an abnormal number of chromosomes in a cell or loss of a chromosomal region or a whole chromosome. It is also applied in different research applications, such as gene mapping or the identification of novel oncogenes. This article reviews the concept of FISH, its application, and its advantages in medical science.
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Affiliation(s)
- Zubair Ahmed Ratan
- Department of Biomedical Engineering, Khulna University of Engineering and Technology, Bangladesh
| | - Sojib Bin Zaman
- Maternal and Child Health Division, International Centre for Diarrhoeal Disease Research, Bangladesh
| | - Varshil Mehta
- Department of Internal Medicine, MGM Medical College, Navi Mumbai, India
| | | | - Nusrat Jahan Runa
- Department of Biochemistry, Gazi Medical College, Khulna, Bangladesh
| | - Nasrin Akter
- Medicine, Yamagata University Faculty of Medicine, Japan
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Želježić D, Mladinić M, Žunec S, Lucić Vrdoljak A, Kašuba V, Tariba B, Živković T, Marjanović AM, Pavičić I, Milić M, Rozgaj R, Kopjar N. Cytotoxic, genotoxic and biochemical markers of insecticide toxicity evaluated in human peripheral blood lymphocytes and an HepG2 cell line. Food Chem Toxicol 2016; 96:90-106. [DOI: 10.1016/j.fct.2016.07.036] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2015] [Revised: 07/27/2016] [Accepted: 07/29/2016] [Indexed: 10/21/2022]
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Welcsh P, Kehrli K, Lazarchuk P, Ladiges W, Sidorova J. Application of the microfluidic-assisted replication track analysis to measure DNA repair in human and mouse cells. Methods 2016; 108:99-110. [PMID: 27130890 DOI: 10.1016/j.ymeth.2016.04.029] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Revised: 04/19/2016] [Accepted: 04/25/2016] [Indexed: 11/25/2022] Open
Abstract
Functional studies of the roles that DNA helicases play in human cells have benefited immensely from DNA fiber (or single molecule) technologies, which enable us to discern minute differences in behaviors of individual replication forks in genomic DNA in vivo. DNA fiber technologies are a group of methods that use different approaches to unravel and stretch genomic DNA to its contour length, and display it on a glass surface in order to immuno-stain nucleoside analog incorporation into DNA to reveal tracks (or tracts) of replication. We have previously adopted a microfluidic approach to DNA stretching and used it to analyze DNA replication. This method was introduced under the moniker maRTA or microfluidic-assisted Replication Track Analysis, and we have since used it to analyze roles of the RECQ helicases WRN and BLM, and other proteins in normal and perturbed replication. Here we describe a novel application of maRTA to detect and measure repair of DNA damage produced by three different agents relevant to etiology or therapy of cancer: methyl-methanesulfonate, UV irradiation, and mitomycin C. Moreover, we demonstrate the utility of this method by analyzing DNA repair in cells with reduced levels of WRN or of the base excision repair protein XRCC1.
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Affiliation(s)
- Piri Welcsh
- Department of Pathology, Box 357705, University of Washington, 1959 NE Pacific St., Seattle, WA 98195-7705, USA
| | - Keffy Kehrli
- Department of Pathology, Box 357705, University of Washington, 1959 NE Pacific St., Seattle, WA 98195-7705, USA
| | - Pavlo Lazarchuk
- Department of Pathology, Box 357705, University of Washington, 1959 NE Pacific St., Seattle, WA 98195-7705, USA
| | - Warren Ladiges
- Department of Comparative Medicine, Box 357340, University of Washington, 1959 NE Pacific St., Seattle, WA 98195-7340, USA
| | - Julia Sidorova
- Department of Pathology, Box 357705, University of Washington, 1959 NE Pacific St., Seattle, WA 98195-7705, USA.
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Wang J, Wang J, Wang G, Zhu L, Wang J. DNA damage and oxidative stress induced by imidacloprid exposure in the earthworm Eisenia fetida. CHEMOSPHERE 2016; 144:510-517. [PMID: 26397468 DOI: 10.1016/j.chemosphere.2015.09.004] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2015] [Revised: 08/31/2015] [Accepted: 09/01/2015] [Indexed: 06/05/2023]
Abstract
To investigate the soil ecological effect of imidacloprid, earthworm Eisenia fetida was exposed to various concentrations of imidacloprid (0.10, 0.50, and 1.00 mg kg(-1) soil) respectively after 7, 14, 21, and 28 d. The effect of imidacloprid on reactive oxygen species (ROS) generation, antioxidant enzymes activity [superoxide dismutase (SOD) and catalase (CAT), glutathione S-transferase enzyme (GST)], malondialdehyde (MDA) content and DNA damage of the E. fetida was investigated. Significant increase of the ROS level was observed. The SOD and GST activity were significantly induced at most exposure intervals. CAT activity was inhibited and reflected a dose-dependent relationship on days 7, 14 and 21. High MDA levels were observed and the olive tail moment (OTM) as well as the percentage of DNA in the comet tail (tail DNA%) in comet assay declined with increasing concentrations and exposure time after 7 d. Our results suggested that the sub-chronic exposure of imidacloprid caused DNA damage and lipid peroxidation (LPO) leading to antioxidant responses in earthworm E. fetida.
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Affiliation(s)
- Juan Wang
- National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Key Laboratory of Agricultural Environment in Universities of Shandong, College of Resources and Environment, Shandong Agricultural University, Taian, 271018, People's Republic of China
| | - Jinhua Wang
- National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Key Laboratory of Agricultural Environment in Universities of Shandong, College of Resources and Environment, Shandong Agricultural University, Taian, 271018, People's Republic of China.
| | - Guangchi Wang
- National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Key Laboratory of Agricultural Environment in Universities of Shandong, College of Resources and Environment, Shandong Agricultural University, Taian, 271018, People's Republic of China
| | - Lusheng Zhu
- National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Key Laboratory of Agricultural Environment in Universities of Shandong, College of Resources and Environment, Shandong Agricultural University, Taian, 271018, People's Republic of China
| | - Jun Wang
- National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Key Laboratory of Agricultural Environment in Universities of Shandong, College of Resources and Environment, Shandong Agricultural University, Taian, 271018, People's Republic of China
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Mallory CM, Carfi RP, Moon S, Cornell KA, Warner DL. Modification of cellular DNA by synthetic aziridinomitosenes. Bioorg Med Chem 2015; 23:7378-85. [PMID: 26541587 PMCID: PMC4673046 DOI: 10.1016/j.bmc.2015.10.028] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Revised: 10/13/2015] [Accepted: 10/20/2015] [Indexed: 11/19/2022]
Abstract
Two synthetic aziridinomitosenes (AZMs), Me-AZM and H-AZM, structurally related to mitomycin C (MC) were evaluated for their anticancer activity against six cancer cell lines (HeLa, Jurkat, T47D, HepG2, HL-60, and HuT-78) and tested for their DNA-modifying abilities in Jurkat cells. Cytotoxicity assays showed that Me-AZM is up to 72-fold and 520-fold more potent than MC and H-AZM, respectively. Me-AZM also demonstrated increased DNA modification over MC and H-AZM in alkaline COMET and Hoechst fluorescence assays that measured crosslinks in cellular DNA. Me-AZM and H-AZM treatment of Jurkat cells was found to sponsor significant DNA-protein crosslinks using a K-SDS assay. The results clearly indicate that the AZM C6/C7 substitution pattern plays an important role in drug activity and supports both DNA-DNA and DNA-protein adduct formation as mechanisms for inducing cytotoxic effects.
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Affiliation(s)
- Chris M Mallory
- Department of Chemistry and Biochemistry, Boise State University, Boise, ID 83725, USA.
| | - Ryan P Carfi
- Department of Chemistry and Biochemistry, Boise State University, Boise, ID 83725, USA.
| | - SangPhil Moon
- Department of Chemistry and Biochemistry, Boise State University, Boise, ID 83725, USA.
| | - Kenneth A Cornell
- Department of Chemistry and Biochemistry, Boise State University, Boise, ID 83725, USA.
| | - Don L Warner
- Department of Chemistry and Biochemistry, Boise State University, Boise, ID 83725, USA.
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13
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Pant K, Roden N, Zhang C, Bruce S, Wood C, Pendino K. Modified in vivo comet assay detects the genotoxic potential of 14-hydroxycodeinone, an α,β-unsaturated ketone in oxycodone. ENVIRONMENTAL AND MOLECULAR MUTAGENESIS 2015; 56:777-787. [PMID: 25913631 DOI: 10.1002/em.21957] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2015] [Revised: 04/13/2015] [Accepted: 04/17/2015] [Indexed: 06/04/2023]
Abstract
14-Hydroxycodeinone (14-HC) is an α,β-unsaturated ketone impurity found in oxycodone drug substance and has a structural alert for genotoxicity. 14-HC was tested in a combined Modified and Standard Comet Assay to determine if the slight decrease in % Tail DNA noted in a previously conducted Standard Comet Assay with 14-HC could be magnified to clarify if the response was due to cross-linking activity. One limitation of the Standard Comet Assay is that DNA cross-links cannot be reliably detected. However, under certain modified testing conditions, DNA cross-links and chemical moieties that elicit such cross-links can be elucidated. One such modification involves the induction of additional breakages of DNA strands by gamma or X-ray irradiation. To determine if 14-HC is a DNA crosslinker in vivo, a Modified Comet Assay was conducted using X-ray irradiation as the modification to visualize crosslinking activity. In this assay, 14-HC was administered orally to mice up to 320 mg/kg/day. Results showed a statistically significant reduction in percent tail DNA in duodenal cells at 320 mg/kg/day, with a nonstatistically significant but dose-related reduction in percent tail DNA also observed at the mid dose of 160 mg/kg/day. Similar decreases were not observed in cells from the liver or stomach, and no increases in percent tail DNA were noted for any tissue in the concomitantly conducted Standard Comet Assay. Taken together, 14-HC was identified as a cross-linking agent in the duodenum in the Modified Comet Assay.
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Affiliation(s)
| | | | | | | | - Craig Wood
- Greenville, Delaware (Formerly of Purdue Pharma, L.P.)
| | - Kimberly Pendino
- Amicus Therapeutics, Cranbury, New Jersey (Formerly of Purdue Pharma, L.P.)
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14
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Neri M, Milazzo D, Ugolini D, Milic M, Campolongo A, Pasqualetti P, Bonassi S. Worldwide interest in the comet assay: a bibliometric study. Mutagenesis 2015; 30:155-63. [PMID: 25527738 DOI: 10.1093/mutage/geu061] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
The comet assay is a rapid, sensitive and relatively simple method for measuring DNA damage. A bibliometric study was performed to evaluate temporal and geographical trends, research quality and main areas of interest in scientific production in this field. A PubMed search strategy was developed and 7674 citations were retrieved in the period 1990-2013. Notably, the MeSH (Medical Subject Headings) term 'comet assay', officially introduced in 2000, is used by indexers only in two thirds of papers retrieved. Articles on the comet assay were published in 78 countries, spread over the 5 continents. The EU contributed the greatest output, producing >2900 articles with IF (42.0%) and totalling almost 10000 IF points, and was followed by USA. In the new millennium, research with this assay reached a plateau or slow decline in the most industrialised areas (USA, Germany, UK, Italy), while its use has boomed in emerging countries, with increases of 5- to 7-fold in the last 10 years in China, India and Brazil, for instance. This transition resulted in a slow decrease of scientific production quality, as the countries that increased their relative weight typically had lower mIFs. The most common MeSH terms used in papers using the comet assay referred to wide areas of interest, such as DNA damage and repair, cell survival and apoptosis, cancer and oxidative stress, occupational and environmental health. Keywords related to humans, rodents and cell culture were also frequently used. The top journal for the comet assay articles was found to be Mutation Research, followed by Mutagenesis. Most papers using the comet assay as a biomarker were published in genetic and toxicology journals, with a stress on environmental and occupational disciplines.
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Affiliation(s)
- Monica Neri
- Clinical and Molecular Epidemiology, Area of Systems Approaches and Non Communicable Diseases, IRCCS San Raffaele Pisana, Via di Val Cannuta, 247, 00166, Rome, Italy
| | - Daniele Milazzo
- Service of Medical Statistics and Information Technology - Fatebenefratelli Foundation for Health Research and Education, AFaR Division, Lungotevere de' Cenci, 5, 00186, Rome, Italy
| | - Donatella Ugolini
- Department of Internal Medicine, University of Genoa, Viale Benedetto XV, 6, 16132, Genoa, Italy, Unit of Clinical Epidemiology, IRCCS AOU San Martino-IST-National Cancer Research Institute, Largo Rosanna Benzi, 10, 16132, Genoa, Italy and
| | - Mirta Milic
- Clinical and Molecular Epidemiology, Area of Systems Approaches and Non Communicable Diseases, IRCCS San Raffaele Pisana, Via di Val Cannuta, 247, 00166, Rome, Italy, Mutagenesis Unit, Institute for Medical Research and Occupational Health, Ksaverska cesta, 2, 10000, Zagreb, Croatia
| | - Alessandra Campolongo
- Service of Medical Statistics and Information Technology - Fatebenefratelli Foundation for Health Research and Education, AFaR Division, Lungotevere de' Cenci, 5, 00186, Rome, Italy
| | - Patrizio Pasqualetti
- Clinical and Molecular Epidemiology, Area of Systems Approaches and Non Communicable Diseases, IRCCS San Raffaele Pisana, Via di Val Cannuta, 247, 00166, Rome, Italy, Service of Medical Statistics and Information Technology - Fatebenefratelli Foundation for Health Research and Education, AFaR Division, Lungotevere de' Cenci, 5, 00186, Rome, Italy
| | - Stefano Bonassi
- Clinical and Molecular Epidemiology, Area of Systems Approaches and Non Communicable Diseases, IRCCS San Raffaele Pisana, Via di Val Cannuta, 247, 00166, Rome, Italy,
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15
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Jost P, Svobodova H, Stetina R. Induction and repair of DNA cross-links induced by sulfur mustard in the A-549 cell line followed by a comet assay. Chem Biol Interact 2015; 237:31-7. [DOI: 10.1016/j.cbi.2015.05.009] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2014] [Revised: 05/10/2015] [Accepted: 05/11/2015] [Indexed: 10/23/2022]
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16
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Uno Y, Kojima H, Omori T, Corvi R, Honma M, Schechtman LM, Tice RR, Beevers C, De Boeck M, Burlinson B, Hobbs CA, Kitamoto S, Kraynak AR, McNamee J, Nakagawa Y, Pant K, Plappert-Helbig U, Priestley C, Takasawa H, Wada K, Wirnitzer U, Asano N, Escobar PA, Lovell D, Morita T, Nakajima M, Ohno Y, Hayashi M. JaCVAM-organized international validation study of the in vivo rodent alkaline comet assay for detection of genotoxic carcinogens: II. Summary of definitive validation study results. MUTATION RESEARCH-GENETIC TOXICOLOGY AND ENVIRONMENTAL MUTAGENESIS 2015. [PMID: 26212295 DOI: 10.1016/j.mrgentox.2015.04.010] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The in vivo rodent alkaline comet assay (comet assay) is used internationally to investigate the in vivo genotoxic potential of test chemicals. This assay, however, has not previously been formally validated. The Japanese Center for the Validation of Alternative Methods (JaCVAM), with the cooperation of the U.S. NTP Interagency Center for the Evaluation of Alternative Toxicological Methods (NICEATM)/the Interagency Coordinating Committee on the Validation of Alternative Methods (ICCVAM), the European Centre for the Validation of Alternative Methods (ECVAM), and the Japanese Environmental Mutagen Society/Mammalian Mutagenesis Study Group (JEMS/MMS), organized an international validation study to evaluate the reliability and relevance of the assay for identifying genotoxic carcinogens, using liver and stomach as target organs. The ultimate goal of this exercise was to establish an Organisation for Economic Co-operation and Development (OECD) test guideline. The study protocol was optimized in the pre-validation studies, and then the definitive (4th phase) validation study was conducted in two steps. In the 1st step, assay reproducibility was confirmed among laboratories using four coded reference chemicals and the positive control ethyl methanesulfonate. In the 2nd step, the predictive capability was investigated using 40 coded chemicals with known genotoxic and carcinogenic activity (i.e., genotoxic carcinogens, genotoxic non-carcinogens, non-genotoxic carcinogens, and non-genotoxic non-carcinogens). Based on the results obtained, the in vivo comet assay is concluded to be highly capable of identifying genotoxic chemicals and therefore can serve as a reliable predictor of rodent carcinogenicity.
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Affiliation(s)
| | | | | | - Raffaella Corvi
- Joint Research Centre of the European Commission, Ispra, Italy
| | | | | | - Raymond R Tice
- National Institute of Environmental Health Sciences, Research Triangle Park, NC, USA
| | | | | | | | | | | | | | | | - Yuzuki Nakagawa
- Hatano Research Institute, Food Drug Safety Center, Kanagawa, Japan
| | | | | | | | | | - Kunio Wada
- The Institute of Environmental Toxicology, Ibaraki, Japan
| | | | | | | | | | | | | | - Yasuo Ohno
- National Institute of Health Sciences, Tokyo, Japan
| | - Makoto Hayashi
- Biosafety Research Center, Foods, Drugs and Pesticides, Shizuoka, Japan
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17
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Abo-zeid MAM, Liehr T, Glei M, Gamal-eldeen AM, Zawrah M, Ali M. Detection of Cyto- and Genotoxicity of Rod-Shaped Gold Nanoparticles in Human Blood Lymphocytes Using Comet-FISH. CYTOLOGIA 2015. [DOI: 10.1508/cytologia.80.173] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Mona A. M. Abo-zeid
- Cancer Biology Laboratory, Centre of Excellence for Advanced Sciences, National Research Centre
- Department of Nutritional Toxicology, Institute for Nutrition, Friedrich Schiller University
- Jena University Hospital, Friedrich Schiller University, Institute of Human Genetics
- Genetics and Cytology Department, Genetic Engineering and Biotechnology Division, National Research Centre
| | - Thomas Liehr
- Jena University Hospital, Friedrich Schiller University, Institute of Human Genetics
| | - Michael Glei
- Department of Nutritional Toxicology, Institute for Nutrition, Friedrich Schiller University
| | - Amira M. Gamal-eldeen
- Cancer Biology Laboratory, Centre of Excellence for Advanced Sciences, National Research Centre
| | - Mahmoud Zawrah
- Nanotechnology Laboratory, Centre of Excellence for Advanced Sciences, National Research Centre
| | - Moustafa Ali
- Nanotechnology Laboratory, Centre of Excellence for Advanced Sciences, National Research Centre
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18
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Abstract
The comet assay combined with fluorescence in-situ hybridisation (FISH) is a powerful technique for comparative analyses of damage induction and repair in genomes and in specific DNA sequences within single cells. Recent advances in the methodology of comet-FISH will be considered here, with particular attention to the design and generation of fluorescent probes. In general, all the approaches must fulfil a few basic requirements: the probes should be no longer than ~300 nucleotides in length (single or double stranded) to be able to penetrate the gel in which the target genomic DNA is embedded, they should be sequence-specific, and their signal should be detectable and distinct from the background fluorescence and the dye used to stain the DNA.
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Affiliation(s)
- Graciela Spivak
- Department of Biology, Stanford University, 385 Serra Mall, Stanford, CA 94395-5020, USA
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19
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Bajacan JEV, Hong IS, Penning TM, Penning TW, Greenberg MM. Quantitative detection of 8-Oxo-7,8-dihydro-2'-deoxyguanosine using chemical tagging and qPCR. Chem Res Toxicol 2014; 27:1227-35. [PMID: 24932862 PMCID: PMC4106692 DOI: 10.1021/tx500120p] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
![]()
8-Oxo-7,8-dihydro-2′-deoxyguanosine
(8-oxodGuo) is a commonly
formed DNA lesion that is useful as a biomarker for oxidative stress.
Although methods for selective quantification of 8-oxodGuo exist,
there is room for additional methods that are sensitive and utilize
instrumentation that is widely available. We previously took advantage
of the reported reactivity of 8-oxodGuo to develop a method for detecting
the lesion by selectively covalently tagging it with a molecule equipped
with a biotin label that can be used subsequently with a reporting
method (XueL., and GreenbergM. M. (2007) J. Am. Chem. Soc.129, 701017497789). We now report a method that can
detect as little as 14 amol of 8-oxodGuo by tagging DNA with a reagent
containing a disulfide that reduces background due to nonspecific
binding. The reagent also contains biotin that enables capturing target
DNA on streptavidin-coated magnetic beads. The captured DNA is quantified
using quantitative PCR. The method is validated by comparing the amount
of 8-oxodGuo detected as a function of Fe2+/H2O2/ascorbate-dose to that reported previously using mass
spectrometry.
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Affiliation(s)
- John Ernest Vallarta Bajacan
- Department of Chemistry, Johns Hopkins University , 3400 N. Charles Street, Baltimore, Maryland 21218, United States
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20
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Garcia K, Blank JL, Bouck DC, Liu XJ, Sappal DS, Hather G, Cosmopoulos K, Thomas MP, Kuranda M, Pickard MD, Liu R, Bandi S, Smith PG, Lightcap ES. Nedd8-activating enzyme inhibitor MLN4924 provides synergy with mitomycin C through interactions with ATR, BRCA1/BRCA2, and chromatin dynamics pathways. Mol Cancer Ther 2014; 13:1625-35. [PMID: 24672057 DOI: 10.1158/1535-7163.mct-13-0634] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
MLN4924 is an investigational small-molecule inhibitor of the Nedd8-activating enzyme currently in phase I clinical trials. MLN4924 induces DNA damage via rereplication in most cell lines. This distinct mechanism of DNA damage may affect its ability to combine with standard-of-care agents and may affect the clinical development of MLN4924. As such, we studied its interaction with other DNA-damaging agents. Mitomycin C, cisplatin, cytarabine, UV radiation, SN-38, and gemcitabine demonstrated synergy in combination with MLN4924 in vitro. The combination of mitomycin C and MLN4924 was shown to be synergistic in a mouse xenograft model. Importantly, depletion of genes within the ataxia telangiectasia and Rad3 related (ATR) and BRCA1/BRCA2 pathways, chromatin modification, and transcription-coupled repair reduced the synergy between mitomycin C and MLN4924. In addition, comet assay demonstrated increased DNA strand breaks with the combination of MLN4924 and mitomycin C. Our data suggest that mitomycin C causes stalled replication forks, which when combined with rereplication induced by MLN4924 results in frequent replication fork collisions, leading to cell death. This study provides a straightforward approach to understand the mechanism of synergy, which may provide useful information for the clinical development of these combinations.
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Affiliation(s)
- Khristofer Garcia
- Authors' Affiliations: Departments of Discovery, Clinical Biostatistics, and Information Technology, Takeda Pharmaceuticals International Co., Cambridge, Massachusetts
| | - Jonathan L Blank
- Authors' Affiliations: Departments of Discovery, Clinical Biostatistics, and Information Technology, Takeda Pharmaceuticals International Co., Cambridge, Massachusetts
| | - David C Bouck
- Authors' Affiliations: Departments of Discovery, Clinical Biostatistics, and Information Technology, Takeda Pharmaceuticals International Co., Cambridge, Massachusetts
| | - Xiaozhen J Liu
- Authors' Affiliations: Departments of Discovery, Clinical Biostatistics, and Information Technology, Takeda Pharmaceuticals International Co., Cambridge, Massachusetts
| | - Darshan S Sappal
- Authors' Affiliations: Departments of Discovery, Clinical Biostatistics, and Information Technology, Takeda Pharmaceuticals International Co., Cambridge, Massachusetts
| | - Greg Hather
- Authors' Affiliations: Departments of Discovery, Clinical Biostatistics, and Information Technology, Takeda Pharmaceuticals International Co., Cambridge, Massachusetts
| | - Katherine Cosmopoulos
- Authors' Affiliations: Departments of Discovery, Clinical Biostatistics, and Information Technology, Takeda Pharmaceuticals International Co., Cambridge, Massachusetts
| | - Michael P Thomas
- Authors' Affiliations: Departments of Discovery, Clinical Biostatistics, and Information Technology, Takeda Pharmaceuticals International Co., Cambridge, Massachusetts
| | - Mike Kuranda
- Authors' Affiliations: Departments of Discovery, Clinical Biostatistics, and Information Technology, Takeda Pharmaceuticals International Co., Cambridge, Massachusetts
| | - Michael D Pickard
- Authors' Affiliations: Departments of Discovery, Clinical Biostatistics, and Information Technology, Takeda Pharmaceuticals International Co., Cambridge, Massachusetts
| | - Ray Liu
- Authors' Affiliations: Departments of Discovery, Clinical Biostatistics, and Information Technology, Takeda Pharmaceuticals International Co., Cambridge, Massachusetts
| | - Syamala Bandi
- Authors' Affiliations: Departments of Discovery, Clinical Biostatistics, and Information Technology, Takeda Pharmaceuticals International Co., Cambridge, Massachusetts
| | - Peter G Smith
- Authors' Affiliations: Departments of Discovery, Clinical Biostatistics, and Information Technology, Takeda Pharmaceuticals International Co., Cambridge, Massachusetts
| | - Eric S Lightcap
- Authors' Affiliations: Departments of Discovery, Clinical Biostatistics, and Information Technology, Takeda Pharmaceuticals International Co., Cambridge, Massachusetts
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21
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Buschini A, Villarini M, Feretti D, Mussi F, Dominici L, Zerbini I, Moretti M, Ceretti E, Bonfiglioli R, Carrieri M, Gelatti U, Rossi C, Monarca S, Poli P. Multicentre study for the evaluation of mutagenic/carcinogenic risk in nurses exposed to antineoplastic drugs: assessment of DNA damage. Occup Environ Med 2013; 70:789-94. [PMID: 24143019 DOI: 10.1136/oemed-2013-101475] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
OBJECTIVES People who handle antineoplastic drugs, many of which classified as human carcinogens by International Agency for Research on Cancer, are exposed to low doses in comparison with patients; however, the long duration of exposure could lead to health effects. The aim of this work was to evaluate DNA damage in white blood cells from 63 nurses who handle antineoplastic drugs in five Italian hospitals and 74 control participants, using different versions of the Comet assay. METHODS Primary DNA damage was assessed by using the alkaline version of the assay on leucocytes, whereas to detect DNA oxidative damage and cryptic lesions specifically, the Comet/ENDO III assay and the Comet/araC assay were performed on leucocytes and lymphocytes, respectively. RESULTS In the present study, no significant DNA damage was correlated with the work shift. The exposed population did not differ significantly from the reference group with respect to DNA primary and oxidative damage in leucocytes. Strikingly, in isolated lymphocytes treated with araC, lower data dispersion as well as a significantly lower mean value for the percentage of DNA in the comet tail was observed in exposed participants as compared with the control group (p<0.05), suggesting a potential chronic exposure to crosslinking antineoplastic drugs. CONCLUSIONS Although stringent rules were adopted at national and international levels to prevent occupational exposure to antineoplastic drugs, data reported in this study support the idea that a more efficient survey on long-lasting exposures at very low concentrations is needed.
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22
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McKenna DJ, Doherty BA, Downes CS, McKeown SR, McKelvey-Martin VJ. Use of the comet-FISH assay to compare DNA damage and repair in p53 and hTERT genes following ionizing radiation. PLoS One 2012; 7:e49364. [PMID: 23145163 PMCID: PMC3492288 DOI: 10.1371/journal.pone.0049364] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2012] [Accepted: 10/09/2012] [Indexed: 12/02/2022] Open
Abstract
The alkaline single cell gel electrophoresis (comet) assay can be combined with fluorescent in situ hybridisation (FISH) methodology in order to investigate the localisation of specific gene domains within an individual cell. The number and position of the fluorescent signal(s) provides information about the relative damage and subsequent repair that is occurring in the targeted gene domain(s). In this study, we have optimised the comet-FISH assay to detect and compare DNA damage and repair in the p53 and hTERT gene regions of bladder cancer cell-lines RT4 and RT112, normal fibroblasts and Cockayne Syndrome (CS) fibroblasts following γ-radiation. Cells were exposed to 5Gy γ-radiation and repair followed for up to 60 minutes. At each repair time-point, the number and location of p53 and hTERT hybridisation spots was recorded in addition to standard comet measurements. In bladder cancer cell-lines and normal fibroblasts, the p53 gene region was found to be rapidly repaired relative to the hTERT gene region and the overall genome, a phenomenon that appeared to be independent of hTERT transcriptional activity. However, in the CS fibroblasts, which are defective in transcription coupled repair (TCR), this rapid repair of the p53 gene region was not observed when compared to both the hTERT gene region and the overall genome, proving the assay can detect variations in DNA repair in the same gene. In conclusion, we propose that the comet-FISH assay is a sensitive and rapid method for detecting differences in DNA damage and repair between different gene regions in individual cells in response to radiation. We suggest this increases its potential for measuring radiosensitivity in cells and may therefore have value in a clinical setting.
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Affiliation(s)
- Declan J McKenna
- Biomedical Sciences Research Institute, University of Ulster, Coleraine, Northern Ireland, United Kingdom.
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23
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Paz MM, Pritsos CA. The Molecular Toxicology of Mitomycin C. ADVANCES IN MOLECULAR TOXICOLOGY VOLUME 6 2012. [DOI: 10.1016/b978-0-444-59389-4.00007-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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24
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Wu JH, Jones NJ. Assessment of DNA interstrand crosslinks using the modified alkaline comet assay. Methods Mol Biol 2012; 817:165-181. [PMID: 22147573 DOI: 10.1007/978-1-61779-421-6_9] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The single cell gel electrophoresis (SCGE) assay, more commonly known as the comet assay, due to the "comet-like" appearance of the cells, was originally developed as a technique to measure the presence of DNA single-strand breaks. The assay is performed on single cells embedded in agar and placed in an electrical field at alkaline pH, so that fragments of negatively charged single-stranded DNA move through the gel toward the positively charged anode. Undamaged DNA moves relatively slowly, forming the head of the comet, while DNA fragmented due to the presence of single-strand breaks, moves more quickly giving the appearance of the tail. The extent of DNA migration is a measure of the DNA damage present. Since it was first developed, the comet assay has been adapted for measuring other types of DNA damage. The neutral comet assay has been employed for DNA double-strand breaks, while techniques using DNA repair enzymes to cleave specific adducts, UvrABC for ultraviolet radiation induced adducts, for example, have also been described. Here, we describe a modified version of the comet assay for the measurement of interstrand crosslinks (ICLs). Interstrand crosslinking agents include the chemotherapeutic agents mitomycin C and cis-platin, psoralen plus UVA light (PUVA) used to treat hyperproliferative skin disorders and diepoxybutane, a metabolite of 1,3-butadiene used in industrial processes and an environmental pollutant. ICLs are a potent and cytotoxic form of DNA damage as they prevent DNA strand separation, thereby preventing DNA replication. Their removal requires several different DNA repair processes including translesion synthesis and homologous recombination. As ICLs prevent separation of the DNA strands, their presence results in less DNA migration in the comet assay. To successfully measure ICLs, it is necessary to incorporate a step that induces single-strand breaks (using a defined dose of ionizing radiation) that allows the crosslinked DNA to migrate.
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Affiliation(s)
- Jian Hong Wu
- Department of Biochemistry and Cell Biology, Institute of Integrative Biology, University of Liverpool, Liverpool, UK
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25
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Hovhannisyan GG. Fluorescence in situ hybridization in combination with the comet assay and micronucleus test in genetic toxicology. Mol Cytogenet 2010; 3:17. [PMID: 20840797 PMCID: PMC2949878 DOI: 10.1186/1755-8166-3-17] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2010] [Accepted: 09/15/2010] [Indexed: 02/04/2023] Open
Abstract
Comet assay and micronucleus (MN) test are widely applied in genotoxicity testing and biomonitoring. While comet assay permits to measure direct DNA-strand breaking capacity of a tested agent MN test allows estimating the induced amount of chromosome and/or genome mutations. The potential of these two methods can be enhanced by the combination with fluorescence in situ hybridization (FISH) techniques. FISH plus comet assay allows the recognition of targets of DNA damage and repairing directly. FISH combined with MN test is able to characterize the occurrence of different chromosomes in MN and to identify potential chromosomal targets of mutagenic substances. Thus, combination of FISH with the comet assay or MN test proved to be promising techniques for evaluation of the distribution of DNA and chromosome damage in the entire genome of individual cells. FISH technique also permits to study comet and MN formation, necessary for correct application of these methods. This paper reviews the relevant literature on advantages and limitations of Comet-FISH and MN-FISH assays application in genetic toxicology.
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Affiliation(s)
- Galina G Hovhannisyan
- Department of Genetics and Cytology, State University, Biological Faculty, 1 Alex Manoukian Street, Yerevan 375025, Armenia.
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26
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Abstract
In this chapter, I describe the alkaline single-cell gel electrophoresis (Comet assay) combined with fluorescence in situ hybridization (FISH) technology, used in our laboratory, to study the incidence and repair of lesions induced in human cells by ultraviolet light. The Comet-FISH method permits the simultaneous and comparative analysis of DNA damage and its repair throughout the genome and in defined chromosomal regions. This very sensitive approach can be applied to any lesion, such as those induced by chemical carcinogens and products of cellular metabolism that can be converted to DNA single- or double-strand breaks. The unique advantages and limitations of the method for particular applications are discussed.
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Affiliation(s)
- Graciela Spivak
- Department of Biology, Stanford University, Stanford, CA, USA.
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27
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Shaposhnikov S, Frengen E, Collins AR. Increasing the resolution of the comet assay using fluorescent in situ hybridization--a review. Mutagenesis 2009; 24:383-9. [DOI: 10.1093/mutage/gep021] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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McArt DG, Wasson GR, McKerr G, Saetzler K, Reed M, Howard CV. Systematic random sampling of the comet assay. Mutagenesis 2009; 24:373-8. [DOI: 10.1093/mutage/gep020] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Zhang K, Qi H, Li H, Liu Y, Chen W. Visualization of cellular DNA crosslinks by atomic force microscopy. SCANNING 2009; 31:75-82. [PMID: 19241448 DOI: 10.1002/sca.20143] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Cellular DNA crosslinks are a type of DNA damage induced by toxic chemicals or high-energy radiation. If damaged DNA is not rapidly repaired, cells will die or mutate. To evaluate the types of DNA damage and their influence on vital cell activities, it is necessary to be able to detect DNA crosslinks. To date, indirect methods such as alkaline elution, potassium chloride-sodium dodecyl sulfate assay and comet assay have been used to detect DNA damage. Direct morphological observation, on the other hand, may be a useful tool to differentiate the types of DNA damage. In this report, atomic force microscopy (AFM) has been employed to visualize the breakage and crosslinking of cellular DNA strands in cells treated with formaldehyde and hydrogen peroxide. Our results showed that toxic chemical-induced crosslinking of cellular DNA occurred in a dose-dependent manner. DNA conglomerates were observed with high concentrations of formaldehyde, and the AFM observations were consistent with those of a comet assay. Our experiments demonstrate that AFM is an efficient method to differentiate the types of DNA damage. SCANNING 31: 75-82, 2009. (c) 2009 Wiley Periodicals, Inc.
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Affiliation(s)
- Kun Zhang
- Institute of Photonics and Photon-Technology, Northwest University, Xi'an, People's Republic of China
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Wu JH, Wilson JB, Wolfreys AM, Scott A, Jones NJ. Optimization of the comet assay for the sensitive detection of PUVA-induced DNA interstrand cross-links. Mutagenesis 2009; 24:173-81. [PMID: 19147795 DOI: 10.1093/mutage/gen068] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Psoralen plus ultraviolet A (PUVA), commonly used for the treatment of hyperproliferative skin disorders, has been found to be associated with an increased risk of squamous cell cancer. Interstrand cross-link (ICL) formation by PUVA treatment is considered the major factor contributing to the carcinogenesis. However, it remains unclear how PUVA causes, or promotes cancers, in humans. As an initial step in understanding the mechanisms of mutagenesis and carcinogenesis of PUVA photochemotherapy, we have optimized and subsequently utilized a modified alkaline comet assay involving a post-lysis gamma-irradiation at 9 Gy to sensitively measure the formation and repair of PUVA-induced ICLs in the immortalized human keratinocyte cell line HaCaT. A clear dose-dependent response of HaCaT cells to PUVA exposure was observed with a combination of a fixed UVA dose at 0.05 J/cm(2) and a dose of 8-methoxypsoralen ranging from 10 to 100 microM. Results also indicated that the ICL repair was concentration dependent. We have also demonstrated that PUVA-induced monoadduct formation, at an estimated ratio of 3:1 to ICLs in the present experimental conditions, does not interfere with the detection of the ICLs in the modified alkaline comet assay. Furthermore, comparison of the amount of ICL formation between the single-dose UVA treatment and a split-dose protocol was performed. The split-dose protocol was believed to generate more ICLs than the single-dose treatment, thus more effective in PUVA photochemotherapy. Our results demonstrate that comparable amounts of ICLs were formed in HaCaT cells for each dose of UVA, using either the split-dose or single-dose protocols.
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Affiliation(s)
- Jian H Wu
- Molecular Oncology Research Group, School of Biological Sciences, University of Liverpool, Liverpool, UK
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31
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FISH glossary: an overview of the fluorescence in situ hybridization technique. Biotechniques 2008; 45:385-6, 388, 390 passim. [PMID: 18855767 DOI: 10.2144/000112811] [Citation(s) in RCA: 91] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
The introduction of FISH (fluorescence in situ hybridization) marked the beginning of a new era for the study of chromosome structure and function. As a combined molecular and cytological approach, the major advantage of this visually appealing technique resides in its unique ability to provide an intermediate degree of resolution between DNA analysis and chromosomal investigations while retaining information at the single-cell level. Used to support large-scale mapping and sequencing efforts related to the human genome project, FISH accuracy and versatility were subsequently capitalized on in biological and medical research, providing a wealth of diverse applications and FISH-based diagnostic assays. The diversification of the original FISH protocol into the impressive number of procedures available these days has been promoted throughout the years by a number of interconnected factors: the improvement in sensitivity, specificity and resolution, together with the advances in the fields of fluorescence microscopy and digital imaging, and the growing availability of genomic and bioinformatic resources. By assembling in a glossary format many of the "acronymed" FISH applications published so far, this review intends to celebrate the ability of FISH to re-invent itself and thus remain at the forefront of biomedical research.
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Lai C, Cao H, Hearst JE, Corash L, Luo H, Wang Y. Quantitative analysis of DNA interstrand cross-links and monoadducts formed in human cells induced by psoralens and UVA irradiation. Anal Chem 2008; 80:8790-8. [PMID: 18947205 DOI: 10.1021/ac801520m] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Upon exposure to UVA light, psoralens can induce DNA interstrand cross-links (ICLs), which can block DNA replication and transcription. Among the psoralen derivatives, 8-methoxypsoralen (8-MOP) is conventionally applied for psoriasis therapy, and amotosalen S59 is used to inactivate bacterial and viral pathogens in blood components. In addition to the ICL formation, psoralens also readily form various monoadducts (MAs) with thymidine residues in DNA when exposed to UVA light, and the biological implications for these monoadducts remain unclear. Here, we reported a method that encompassed digestion with a single enzyme (nuclease P1) and LC-MS/MS, for the simultaneous quantification of ICL and MAs induced in human cells exposed with 8-MOP or S59 and UVA light. Our results showed that the yield of ICL induced by S59, which increased from 3.9 to 12.8 lesions/10(3) nucleotides as the dose of UVA light increased from 0.5 to 10.0 J/cm(2), was approximately 100 fold more than that induced by 8-MOP. In addition, three and five products were identified as 8-MOP- and S59-MAs, respectively, and the yields of MAs were significantly lower than that for ICL. The yields of the three 8-MOP-MAs were 7.6-2.2, 1.9-9.9, and 7.2-51 per 10(6) nucleotides and those of the five S59-MAs were 215-19, 106-39, 25-21, 32-146, and 22-26 per 10(6) nucleotides as the dose of UVA light increased from 0.5 to 10.0 J/cm(2). Although the yields of MAs induced by 8-MOP and S59 were lower than those of the respective ICLs under the same exposure conditions, the formation of appreciable amounts of MAs might account for some of the mutations induced by psoralens.
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Affiliation(s)
- Congfang Lai
- Department of Chemistry, University of California, Riverside, California 92521-0403, USA
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Roh DS, Cook AL, Rhee SS, Joshi A, Kowalski R, Dhaliwal DK, Funderburgh JL. DNA cross-linking, double-strand breaks, and apoptosis in corneal endothelial cells after a single exposure to mitomycin C. Invest Ophthalmol Vis Sci 2008; 49:4837-43. [PMID: 18658091 DOI: 10.1167/iovs.08-2115] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
PURPOSE To investigate the cellular effects of mitomycin C (MMC) treatment on corneal endothelial (CE) cells at clinically relevant applications and dosages. METHODS Radial and posterior diffusion of MMC was determined by an Escherichia coli growth inhibition bioassay. A modified version of the comet assay (single cell gel electrophoresis) was used to detect DNA cross-linking. Immunostaining detected the nuclear phosphorylated histone variant H2AX (gamma-H2AX) indicating DNA double-strand breaks. Apoptosis in MMC-treated cells was detected with annexin V staining. RESULTS Topical application of 0.02% MMC to intact goat globes resulted in MMC in the CE at 0.37 microg/mL and produced a significant increase in CE DNA cross-linking with as little as 6 seconds of topical MMC treatment. DNA cross-linking was also demonstrated in cultured CE cells by using MMC exposures similar to those detected in CE of intact eyes. Such MMC treatment of CE produced elevated and persistent gamma-H2AX-positive cells indicative of DNA double-strand breaks. Similarly, there was an increase in the proportion of apoptotic CE cells, evidenced by positive annexin V staining. CONCLUSIONS The results demonstrate that exposure to MMC at times and concentrations commonly used in refractive surgery produces cross-linking of corneal endothelial DNA, persistent DNA damage, and endothelial death via apoptosis. Current practices of MMC application during refractive surgeries may increase the potential for long-term and permanent deleterious effects on the health of the corneal endothelium.
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Affiliation(s)
- Danny S Roh
- Department of Ophthalmology, UPMC Eye Center, Eye and Ear Institute, Ophthalmology and Visual Sciences Research Center, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15213-2588, USA
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Hwang ET, Ahn JM, Kim BC, Gu MB. Construction of a nrdA::luxCDABE Fusion and Its Use in Escherichia coli as a DNA Damage Biosensor. SENSORS 2008; 8:1297-1307. [PMID: 27879766 PMCID: PMC3927504 DOI: 10.3390/s8021297] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/31/2008] [Accepted: 02/21/2008] [Indexed: 11/22/2022]
Abstract
The promoter of nrdA gene which is related with DNA synthesis was used to construct a DNA damage sensitive biosensor. A recombinant bioluminescent E. coli strain, BBTNrdA, harboring a plasmid with the nrdA promoter fused to the luxCDABE operon, was successfully constructed. Its response to various chemicals including genotoxic chemicals substantiates it as a DNA damage biosensor. In characterization, three different classes of toxicants were used: DNA damaging chemicals, oxidative stress chemicals, and phenolics. BBTNrdA only responded strongly to DNA damaging chemicals, such as nalidixic acid (NDA), mitomycin C (MMC), 1-methyl-1-nitroso-N-methylguanidine (MNNG), and 4-nitroquinoline N-oxide (4-NQO). In contrast, there were no responses from the oxidative stress chemicals and phenolics, except from hydrogen peroxide (H2O2) which is known to cause DNA damage indirectly. Therefore, the results of the study demonstrate that BBTNrdA can be used as a DNA damage biosensor.
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Affiliation(s)
- Ee Taek Hwang
- College of Life Sciences and Biotechnology, Korea University, Anam-dong, Seongbuk-Gu, Seoul, Republic of Korea
| | - Joo- Myung Ahn
- College of Life Sciences and Biotechnology, Korea University, Anam-dong, Seongbuk-Gu, Seoul, Republic of Korea
| | - Byoung Chan Kim
- Diagnostics Group, Institut Pasteur Korea, Hawolgok-dong, Seongbuk-gu, Seoul, Republic of Korea
| | - Man Bock Gu
- College of Life Sciences and Biotechnology, Korea University, Anam-dong, Seongbuk-Gu, Seoul, Republic of Korea.
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Discrimination of toxic impacts of various chemicals using chemical–gene expression profiling of Escherichia coli DNA microarray. Process Biochem 2007. [DOI: 10.1016/j.procbio.2006.09.021] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Ahn JM, Kim BC, Gu MB. Characterization ofgltA: luxCDABE fusion inEscherichia coli as a toxicity biosensor. BIOTECHNOL BIOPROC E 2006. [DOI: 10.1007/bf02932076] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Lower level of BRCA2 protein in heterozygous mutation carriers is correlated with an increase in DNA double strand breaks and an impaired DSB repair. Cancer Lett 2006; 243:90-100. [DOI: 10.1016/j.canlet.2005.11.041] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2005] [Revised: 11/15/2005] [Accepted: 11/22/2005] [Indexed: 01/07/2023]
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Jamieson D, Tung ATY, Knox RJ, Boddy AV. Reduction of mitomycin C is catalysed by human recombinant NRH:quinone oxidoreductase 2 using reduced nicotinamide adenine dinucleotide as an electron donating co-factor. Br J Cancer 2006; 95:1229-33. [PMID: 17031400 PMCID: PMC2360572 DOI: 10.1038/sj.bjc.6603414] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
NRH:Quinone Oxidoreductase 2 (NQO2) has been described as having no enzymatic activity with nicotinamide adenine dinucleotide (NADH) or NADPH as electron donating cosubstrates. Mitomycin C (MMC) is both a substrate for and a mechanistic inhibitor of the NQO2 homologue NQO1. NRH:quinone oxidoreductase 2 catalysed the reduction of MMC at pH 5.8 with NADH as a co-factor. This reaction results in species that inhibit the NQO2-mediated metabolism of CB1954. In addition, MMC caused an increase in DNA cross-links in a cell line transfected to overexpress NQO2 to an extent comparable to that observed with an isogenic NQO1-expressing cell line. These data indicate that NQO2 may contribute to the metabolism of MMC to cytotoxic species.
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Affiliation(s)
- D Jamieson
- Northern Institute for Cancer Research, University of Newcastle upon Tyne, Paul O'Gorman Building, Medical School, Newcastle upon Tyne NE2 4HH, UK.
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Ishiguro K, Seow HA, Penketh PG, Shyam K, Sartorelli AC. Mode of action of the chloroethylating and carbamoylating moieties of the prodrug cloretazine. Mol Cancer Ther 2006; 5:969-76. [PMID: 16648568 PMCID: PMC2680221 DOI: 10.1158/1535-7163.mct-05-0532] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Cloretazine is an antitumor sulfonylhydrazine prodrug that generates both chloroethylating and carbamoylating species. The cytotoxic potency of these species was analyzed in L1210 leukemia cells using analogues with chloroethylating or carbamoylating function only. Clonogenic assays showed that the chloroethylating-only agent 1,2-bis(methylsulfonyl)-1-(2-chloroethyl)hydrazine (90CE) produced marked differential cytotoxicity against wild-type and O6-alkylguanine-DNA alkyltransferase-transfected L1210 cells (LC10, 1.4 versus 31 micromol/L), indicating that a large portion of the cytotoxicity was due to alkylation of DNA at the O-6 position of guanine. Consistent with the concept that O-6 chloroethylation of DNA guanine progresses to interstrand cross-links, the comet assay, in which DNA cross-links were measured by a reduction in DNA migration induced by strand breaks, showed that cloretazine and 90CE, but not the carbamoylating-only agent 1,2-bis(methylsulfonyl)-1-[(methylamino)carbonyl]hydrazine (101MDCE), produced DNA cross-links and that cloretazine caused more DNA cross-links than 90CE at equimolar concentrations. Cell cycle analyses showed that 90CE and 101MDCE at concentrations of 5 and 80 micromol/L, respectively, produced similar degrees of G2-M arrest. 90CE produced selective inhibition of DNA synthesis after overnight incubation, whereas 101MDCE caused rapid and nonselective inhibition of RNA, DNA, and protein syntheses. Both 90CE and 101MDCE induced phosphorylation of histone H2AX, albeit with distinct kinetics. These results indicate that (a) differential expression of O6-alkylguanine-DNA alkyltransferase in tumor and host cells seems to be responsible for tumor selectivity exerted by cloretazine; (b) 101MDCE enhances DNA cross-linking activity; and (c) 90CE induces cell death at concentrations lower than those causing alterations in the cell cycle and macromolecular syntheses.
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Affiliation(s)
- Kimiko Ishiguro
- Department of Pharmacology, Yale University School of Medicine, 333 Cedar Street, New Haven, CT 06520, USA
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Amendola R, Basso E, Pacifici PG, Piras E, Giovanetti A, Volpato C, Romeo G. Ret, Abl1 (cAbl) and Trp53 gene fragmentations in comet-FISH assay act as in vivo biomarkers of radiation exposure in C57BL/6 and CBA/J mice. Radiat Res 2006; 165:553-61. [PMID: 16669710 DOI: 10.1667/rr3544.1] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
The International Commission on Radiation Protection (ICRP) has lowered the dose limits for workers and for the general public exposed to ionizing radiation. Consequently, a reliable dosimetric method for monitoring possible radiation-induced damage is of great importance in radioprotection. The counting of dicentric chromosomal aberrations and of micronuclei in peripheral blood lymphocytes is unreliable when it is applied to in vivo biopsies and for low-dose exposures. Single-cell gel electrophoresis (SCGE or comet assay), although sensitive and rapid, shows high variability when applied in vivo, probably due to prompt repair of the DNA breaks and confounding environmental factors. In this paper, we describe specific in situ hybridization of Ret, Abl1 (cAbl), and Trp53 gene fragmentations on SCGE slides (comet-FISH assay) in peripheral blood cells from C57BL/6 and CBA/J mice as an indicator of radiation-induced DNA damage. The results obtained from four mice for each experimental point (0, 1, 2 and 4 Gy of X rays) discriminated in a statistically significant way the effects of all doses when fragmentations were analyzed for the Ret, Ab1 and Trp53 genes. SCGE alone, when applied to the same specimens, produced no significant results because of interindividual and experimental variability.
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Atanassov BS, Barrett JC, Davis BJ. Homozygous germ line mutation in exon 27 of murine Brca2 disrupts the Fancd2-Brca2 pathway in the homologous recombination-mediated DNA interstrand cross-links' repair but does not affect meiosis. Genes Chromosomes Cancer 2005; 44:429-37. [PMID: 16127665 DOI: 10.1002/gcc.20255] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
The role of the region encoded by exon 27 of the Brca2 gene in DNA repair was studied in cells and tissues from Brca2Delta27/Delta27 mice. The COOH-terminal truncated Brca2 localized to the nucleus in primary mouse embryo fibroblasts from Brca2Delta27/Delta27 mice. Fluorescence-activated cell sorting (FACS) analysis demonstrated that these fibroblasts were hypersensitive to mitomycin C-induced cross-links, but not to double-strand breaks (DSBs) induced by irradiation. The gammaH2AX appearance kinetics and comet assay showed that DSBs were repaired through non-homologous end joining pathways, while interstrand cross-links were not repaired due to deficient homologous recombination pathways. Immunoprecipitation experiments showed that Fancd2 did not coprecipitate with the mutated Brca2. There were also no detectable Rad51-positive foci formed in these cells after damage. On the other hand, we did not find any difference during gametogenesis in mice harboring exon 27 truncating mutation of the Brca2 gene and control mice, and in both cases, Rad51 localized to the recombination foci. Our results suggest that exon 27 of murine Brca2 is crucial for the interaction of Brca2 and Fancd2 in Rad51-mediated recombination in response to DNA damage, but that this interaction is not taking place in the homologous recombination during meiosis.
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Affiliation(s)
- Boyko S Atanassov
- Laboratory of Women's Health, National Institute of Environmental Health Sciences, NIH, Research Triangle Park, NC, USA
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