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Ma J, Qi R, Harcourt EM, Chen YT, Barbosa GM, Peng Z, Howarth S, Delaney S, Li D. 3,N4-Etheno-5-methylcytosine blocks TET1-3 oxidation but is repaired by ALKBH2, 3 and FTO. Nucleic Acids Res 2024:gkae818. [PMID: 39315710 DOI: 10.1093/nar/gkae818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2024] [Revised: 09/04/2024] [Accepted: 09/11/2024] [Indexed: 09/25/2024] Open
Abstract
5-Methyldeoxycytidine (5mC) is a major epigenetic marker that regulates cellular functions in mammals. Endogenous lipid peroxidation can convert 5mC into 3,N4-etheno-5-methylcytosine (ϵ5mC). ϵ5mC is structurally similar to the mutagenic analog 3,N4-ethenocytosine (ϵC), which is repaired by AlkB family enzymes in the direct reversal repair (DRR) pathway and excised by DNA glycosylases in the base excision repair (BER) pathway. However, the repair of ϵ5mC has not been reported. Here, we examined the activities against ϵ5mC by DRR and BER enzymes and TET1-3, enzymes that modify the 5-methyl group in 5mC. We found that the etheno modification of 5mC blocks oxidation by TET1-3. Conversely, three human homologs in the AlkB family, ALKBH2, 3 and FTO were able to repair ϵ5mC to 5mC, which was subsequently modified by TET1 to 5-hydroxymethylcytosine. We also demonstrated that ALKBH2 likely repairs ϵ5mC in MEF cells. Another homolog, ALKBH5, could not repair ϵ5mC. Also, ϵ5mC is not a substrate for BER glycosylases SMUG1, AAG, or TDG. These findings indicate DRR committed by ALKBH2, 3 and FTO could reduce the detrimental effects of ϵ5mC in genetics and epigenetics and may work together with TET enzymes to modulate epigenetic regulations.
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Affiliation(s)
- Jian Ma
- Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, Kingston RI 02881, USA
| | - Rui Qi
- Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, Kingston RI 02881, USA
| | - Emily M Harcourt
- Department of Chemistry, Le Moyne College, Syracuse, NY 13214, USA
| | - Yi-Tzai Chen
- Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, Kingston RI 02881, USA
| | | | - Zhiyuan Peng
- Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, Kingston RI 02881, USA
| | - Samuel Howarth
- Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, Kingston RI 02881, USA
| | - Sarah Delaney
- Department of Chemistry, Brown University, Providence, RI 02912, USA
| | - Deyu Li
- Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, Kingston RI 02881, USA
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Godschalk R, Faulk C, LaRocca J, van Benthem J, Marchetti F. Epigenotoxicity: Decoding the epigenetic imprints of genotoxic agents and their implications for regulatory genetic toxicology. ENVIRONMENTAL AND MOLECULAR MUTAGENESIS 2024. [PMID: 39262275 DOI: 10.1002/em.22626] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2024] [Revised: 08/16/2024] [Accepted: 08/20/2024] [Indexed: 09/13/2024]
Abstract
Regulatory genetic toxicology focuses on DNA damage and subsequent gene mutations. However, genotoxic agents can also affect epigenetic marks, and incorporation of epigenetic data into the regulatory framework may thus enhance the accuracy of risk assessment. Additionally, epigenetic alterations may identify non-genotoxic carcinogens that are not captured with the current battery of tests. Epigenetic alterations could also explain long-term consequences and potential transgenerational effects in the absence of DNA mutations. Therefore, at the 2022 International Workshops on Genotoxicity Testing (IWGT) in Ottawa (Ontario, Canada), an expert workgroup explored whether including epigenetic endpoints would improve regulatory genetic toxicology. Here we summarize the presentations and the discussions on technical advancements in assessing epigenetics, how the assessment of epigenetics can enhance strategies for detecting genotoxic and non-genotoxic carcinogens and the correlation between epigenetic alterations with other relevant apical endpoints.
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Affiliation(s)
- Roger Godschalk
- Department of Pharmacology and Toxicology, School for Nutrition and Translational Research in Metabolism, Maastricht University, Maastricht, The Netherlands
| | | | | | - Jan van Benthem
- National Institute for Public Health and the Environment, Bilthoven, The Netherlands
| | - Francesco Marchetti
- Environmental Health Science and Research Bureau, Health Canada, Ottawa, Ontario, Canada
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Peng Z, Ma J, Christov CZ, Karabencheva-Christova T, Lehnert N, Li D. Kinetic Studies on the 2-Oxoglutarate/Fe(II)-Dependent Nucleic Acid Modifying Enzymes from the AlkB and TET Families. DNA 2023; 3:65-84. [PMID: 38698914 PMCID: PMC11065319 DOI: 10.3390/dna3020005] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 05/05/2024]
Abstract
Nucleic acid methylations are important genetic and epigenetic biomarkers. The formation and removal of these markers is related to either methylation or demethylation. In this review, we focus on the demethylation or oxidative modification that is mediated by the 2-oxoglutarate (2-OG)/Fe(II)-dependent AlkB/TET family enzymes. In the catalytic process, most enzymes oxidize 2-OG to succinate, in the meantime oxidizing methyl to hydroxymethyl, leaving formaldehyde and generating demethylated base. The AlkB enzyme from Escherichia coli has nine human homologs (ALKBH1-8 and FTO) and the TET family includes three members, TET1 to 3. Among them, some enzymes have been carefully studied, but for certain enzymes, few studies have been carried out. This review focuses on the kinetic properties of those 2-OG/Fe(II)-dependent enzymes and their alkyl substrates. We also provide some discussions on the future directions of this field.
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Affiliation(s)
- Zhiyuan Peng
- Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, Kingston, RI 02881, USA
| | - Jian Ma
- Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, Kingston, RI 02881, USA
| | - Christo Z. Christov
- Department of Chemistry, Michigan Technological University, Houghton, MI 49931, USA
| | | | - Nicolai Lehnert
- Department of Chemistry and Department of Biophysics, University of Michigan, Ann Arbor, MI 48109, USA
| | - Deyu Li
- Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, Kingston, RI 02881, USA
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Chronic Ethanol Consumption and Generation of Etheno-DNA Adducts in Cancer-Prone Tissues. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2018; 1032:81-92. [PMID: 30362092 DOI: 10.1007/978-3-319-98788-0_6] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Chronic ethanol consumption is a risk factor for several human cancers. A variety of mechanisms may contribute to this carcinogenic effect of alcohol including oxidative stress with the generation of reactive oxygen species (ROS), formed via inflammatory pathways or as byproducts of ethanol oxidation through cytochrome P4502E1 (CYP2E1). ROS may lead to lipidperoxidation (LPO) resulting in LPO-products such as 4-hydoxynonenal (4-HNE) or malondialdehyde. These compounds can react with DNA bases forming mutagenic and carcinogenic etheno-DNA adducts. Etheno-DNA adducts are generated in the liver (HepG2) cells over-expressing CYP2E1 when incubated with ethanol;and are inhibited by chlormethiazole. In liver biopsies etheno-DNA adducts correlated significantly with CYP2E1. Such a correlation was also found in the esophageal- and colorectal mucosa of alcoholics. Etheno-DNA adducts also increased in liver biopsies from patients with non alcoholic steatohepatitis (NASH). In various animal models with fatty liver either induced by high fat diets or genetically modified such as in the obese Zucker rat, CYP2E1 is induced and paralleled by high levels of etheno DNA-adducts which may be modified by additional alcohol administration. As elevation of adduct levels in NASH children were already detected at a young age, these lesions may contribute to hepatocellular cancer development later in life. Together these data strongly implicate CYP2E1 as an important mediator for etheno-DNA adduct formation, and this detrimental DNA damage may act as a driving force for malignant disease progression.
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Eckl PM, Bresgen N. Genotoxicity of lipid oxidation compounds. Free Radic Biol Med 2017; 111:244-252. [PMID: 28167130 DOI: 10.1016/j.freeradbiomed.2017.02.002] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Revised: 01/28/2017] [Accepted: 02/01/2017] [Indexed: 12/23/2022]
Abstract
Lipid peroxidation, the oxidative degradation of membrane lipids by reactive oxygen species generates a large variety of breakdown products such as alkanes, aldehydes, ketones, alcohols, furans and others. Due to their reactivity aldehydes (alkanals, 2-alkenals, 2,4-alkadienals, 4-hydroxyalkenals) received a lot of attention, in particular because they can diffuse from the site of formation and interact with proteins and nucleic acids thus acting as second toxic messengers. The major aldehydic peroxidation product of membrane lipids is 4-hydroxynonenal (HNE). Since HNE and other 4-hydroxyalkenals are strong alkylating agents they have therefore been considered to be the biologically most important peroxidation products. Although initially research focused on the toxicological potential of these compounds it is now well known that they play also a crucial role in cell signaling under physiological and pathophysiological conditions. Thus, it is obvious that the biological effects will be determined by the intracellular concentrations which can trigger adaptation, DNA damage and cell death. This review will not cover all these aspects but will concentrate on the genotoxic properties of selected lipid oxidation products important in the context of pathophysiological developments together with a chapter on epigenetic modifications.
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Affiliation(s)
- Peter M Eckl
- Department of Cell Biology and Physiology, University of Salzburg, Hellbrunnerstr. 34, A-5020 Salzburg, Austria.
| | - Nikolaus Bresgen
- Department of Cell Biology and Physiology, University of Salzburg, Hellbrunnerstr. 34, A-5020 Salzburg, Austria
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Gentile F, Arcaro A, Pizzimenti S, Daga M, Cetrangolo GP, Dianzani C, Lepore A, Graf M, Ames PRJ, Barrera G. DNA damage by lipid peroxidation products: implications in cancer, inflammation and autoimmunity. AIMS GENETICS 2017; 4:103-137. [PMID: 31435505 PMCID: PMC6690246 DOI: 10.3934/genet.2017.2.103] [Citation(s) in RCA: 90] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Accepted: 04/12/2017] [Indexed: 12/19/2022]
Abstract
Oxidative stress and lipid peroxidation (LPO) induced by inflammation, excess metal storage and excess caloric intake cause generalized DNA damage, producing genotoxic and mutagenic effects. The consequent deregulation of cell homeostasis is implicated in the pathogenesis of a number of malignancies and degenerative diseases. Reactive aldehydes produced by LPO, such as malondialdehyde, acrolein, crotonaldehyde and 4-hydroxy-2-nonenal, react with DNA bases, generating promutagenic exocyclic DNA adducts, which likely contribute to the mutagenic and carcinogenic effects associated with oxidative stress-induced LPO. However, reactive aldehydes, when added to tumor cells, can exert an anticancerous effect. They act, analogously to other chemotherapeutic drugs, by forming DNA adducts and, in this way, they drive the tumor cells toward apoptosis. The aldehyde-DNA adducts, which can be observed during inflammation, play an important role by inducing epigenetic changes which, in turn, can modulate the inflammatory process. The pathogenic role of the adducts formed by the products of LPO with biological macromolecules in the breaking of immunological tolerance to self antigens and in the development of autoimmunity has been supported by a wealth of evidence. The instrumental role of the adducts of reactive LPO products with self protein antigens in the sensitization of autoreactive cells to the respective unmodified proteins and in the intermolecular spreading of the autoimmune responses to aldehyde-modified and native DNA is well documented. In contrast, further investigation is required in order to establish whether the formation of adducts of LPO products with DNA might incite substantial immune responsivity and might be instrumental for the spreading of the immunological responses from aldehyde-modified DNA to native DNA and similarly modified, unmodified and/or structurally analogous self protein antigens, thus leading to autoimmunity.
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Affiliation(s)
- Fabrizio Gentile
- Department of Medicine and Health Sciences “V. Tiberio”, University of Molise, Campobasso, Italy
| | - Alessia Arcaro
- Department of Medicine and Health Sciences “V. Tiberio”, University of Molise, Campobasso, Italy
| | - Stefania Pizzimenti
- Department of Clinical and Biological Sciences, University of Torino, Torino, Italy
| | - Martina Daga
- Department of Clinical and Biological Sciences, University of Torino, Torino, Italy
| | | | - Chiara Dianzani
- Department of Drug Science and Technology, University of Torino, Torino, Italy
| | - Alessio Lepore
- Department of Molecular Medicine and Medical Biotechnologies, University of Naples Federico II, Naples, Italy
| | - Maria Graf
- Department of Molecular Medicine and Medical Biotechnologies, University of Naples Federico II, Naples, Italy
| | - Paul R. J. Ames
- CEDOC, NOVA Medical School, Universidade NOVA de Lisboa, Lisboa, Portugal, and Department of Haematology, Dumfries Royal Infirmary, Dumfries, Scotland, UK
| | - Giuseppina Barrera
- Department of Clinical and Biological Sciences, University of Torino, Torino, Italy
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7
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Teufel U, Peccerella T, Engelmann G, Bruckner T, Flechtenmacher C, Millonig G, Stickel F, Hoffmann GF, Schirmacher P, Mueller S, Bartsch H, Seitz HK. Detection of carcinogenic etheno-DNA adducts in children and adolescents with non-alcoholic steatohepatitis (NASH). Hepatobiliary Surg Nutr 2016; 4:426-35. [PMID: 26734629 DOI: 10.3978/j.issn.2304-3881.2015.12.03] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
BACKGROUND Carcinogenic exocyclic-DNA adducts like 1,N(6)-etheno-2'-deoxyadenosine (εdA) are formed through reactive intermediates of 4-hydroxynonenal (4-HNE) or other lipid peroxidation (LPO) products with the DNA bases A, C, methyl-C and G. High levels of hepatic etheno-DNA adducts have been detected in cancer prone liver diseases including alcoholic liver disease (ALD). In ALD εdA levels correlated significantly with cytochrome P-450 2E1 (CYP2E1) expression which is also induced in non-alcoholic steatohepatitis (NASH). We investigated the occurrence of εdA adducts in children with NASH as a DNA damage marker. METHODS Liver biopsies from 21 children/adolescents with histologically proven NASH were analysed for hepatic fat content, inflammation, and fibrosis. εdA levels in DNA, CYP2E1-expression and protein bound 4-hydroxynonenal (HNE) were semi-quantitatively evaluated by immunohistochemistry. RESULTS Among 21 NASH children, εdA levels in the liver were high in 3, moderate in 5, weak in 9 and not elevated in 4 patients. There was a positive correlation between CYP2E1 and protein-bound 4-HNE (r=0.60; P=0.008) and a trend for a positive relationship for CYP2E1 vs. staining intensity of εdA (r=0.45; P=0.06). Inflammatory activity and fibrosis correlated significantly (r=0.49, P=0.023). CONCLUSIONS Our results demonstrate for the first time the presence of elevated carcinogenic etheno-DNA lesions (εdA) in the majority (17/21) of liver biopsies from young NASH patients. Our data suggest that LPO-derived etheno-adducts are implicated in NASH. Whether these adducts may serve as predictive risk markers in NASH children to develop hepatocellular cancer later in life remains to be investigated.
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Affiliation(s)
- Ulrike Teufel
- 1 Department of Paediatrics, University of Heidelberg, Heidelberg, Germany ; 2 Alcohol Research Centre, University of Heidelberg and Department of Medicine (Gastroenterology & Hepatology), Salem Medical Centre, Heidelberg, Germany ; 3 Institute of Medical Biometry and Informatics, 4 Department of Pathology, University of Heidelberg, Heidelberg, Germany ; 5 Hepatology Unit, Clinic Beau-Site Hirslanden, Bern, Switzerland ; 6 Erstwhile: Division of Toxicology and Cancer Risk Factors, German Cancer Research Centre (DKFZ), Heidelberg, Germany
| | - Teresa Peccerella
- 1 Department of Paediatrics, University of Heidelberg, Heidelberg, Germany ; 2 Alcohol Research Centre, University of Heidelberg and Department of Medicine (Gastroenterology & Hepatology), Salem Medical Centre, Heidelberg, Germany ; 3 Institute of Medical Biometry and Informatics, 4 Department of Pathology, University of Heidelberg, Heidelberg, Germany ; 5 Hepatology Unit, Clinic Beau-Site Hirslanden, Bern, Switzerland ; 6 Erstwhile: Division of Toxicology and Cancer Risk Factors, German Cancer Research Centre (DKFZ), Heidelberg, Germany
| | - Guido Engelmann
- 1 Department of Paediatrics, University of Heidelberg, Heidelberg, Germany ; 2 Alcohol Research Centre, University of Heidelberg and Department of Medicine (Gastroenterology & Hepatology), Salem Medical Centre, Heidelberg, Germany ; 3 Institute of Medical Biometry and Informatics, 4 Department of Pathology, University of Heidelberg, Heidelberg, Germany ; 5 Hepatology Unit, Clinic Beau-Site Hirslanden, Bern, Switzerland ; 6 Erstwhile: Division of Toxicology and Cancer Risk Factors, German Cancer Research Centre (DKFZ), Heidelberg, Germany
| | - Thomas Bruckner
- 1 Department of Paediatrics, University of Heidelberg, Heidelberg, Germany ; 2 Alcohol Research Centre, University of Heidelberg and Department of Medicine (Gastroenterology & Hepatology), Salem Medical Centre, Heidelberg, Germany ; 3 Institute of Medical Biometry and Informatics, 4 Department of Pathology, University of Heidelberg, Heidelberg, Germany ; 5 Hepatology Unit, Clinic Beau-Site Hirslanden, Bern, Switzerland ; 6 Erstwhile: Division of Toxicology and Cancer Risk Factors, German Cancer Research Centre (DKFZ), Heidelberg, Germany
| | - Christa Flechtenmacher
- 1 Department of Paediatrics, University of Heidelberg, Heidelberg, Germany ; 2 Alcohol Research Centre, University of Heidelberg and Department of Medicine (Gastroenterology & Hepatology), Salem Medical Centre, Heidelberg, Germany ; 3 Institute of Medical Biometry and Informatics, 4 Department of Pathology, University of Heidelberg, Heidelberg, Germany ; 5 Hepatology Unit, Clinic Beau-Site Hirslanden, Bern, Switzerland ; 6 Erstwhile: Division of Toxicology and Cancer Risk Factors, German Cancer Research Centre (DKFZ), Heidelberg, Germany
| | - Gunda Millonig
- 1 Department of Paediatrics, University of Heidelberg, Heidelberg, Germany ; 2 Alcohol Research Centre, University of Heidelberg and Department of Medicine (Gastroenterology & Hepatology), Salem Medical Centre, Heidelberg, Germany ; 3 Institute of Medical Biometry and Informatics, 4 Department of Pathology, University of Heidelberg, Heidelberg, Germany ; 5 Hepatology Unit, Clinic Beau-Site Hirslanden, Bern, Switzerland ; 6 Erstwhile: Division of Toxicology and Cancer Risk Factors, German Cancer Research Centre (DKFZ), Heidelberg, Germany
| | - Felix Stickel
- 1 Department of Paediatrics, University of Heidelberg, Heidelberg, Germany ; 2 Alcohol Research Centre, University of Heidelberg and Department of Medicine (Gastroenterology & Hepatology), Salem Medical Centre, Heidelberg, Germany ; 3 Institute of Medical Biometry and Informatics, 4 Department of Pathology, University of Heidelberg, Heidelberg, Germany ; 5 Hepatology Unit, Clinic Beau-Site Hirslanden, Bern, Switzerland ; 6 Erstwhile: Division of Toxicology and Cancer Risk Factors, German Cancer Research Centre (DKFZ), Heidelberg, Germany
| | - Georg F Hoffmann
- 1 Department of Paediatrics, University of Heidelberg, Heidelberg, Germany ; 2 Alcohol Research Centre, University of Heidelberg and Department of Medicine (Gastroenterology & Hepatology), Salem Medical Centre, Heidelberg, Germany ; 3 Institute of Medical Biometry and Informatics, 4 Department of Pathology, University of Heidelberg, Heidelberg, Germany ; 5 Hepatology Unit, Clinic Beau-Site Hirslanden, Bern, Switzerland ; 6 Erstwhile: Division of Toxicology and Cancer Risk Factors, German Cancer Research Centre (DKFZ), Heidelberg, Germany
| | - Peter Schirmacher
- 1 Department of Paediatrics, University of Heidelberg, Heidelberg, Germany ; 2 Alcohol Research Centre, University of Heidelberg and Department of Medicine (Gastroenterology & Hepatology), Salem Medical Centre, Heidelberg, Germany ; 3 Institute of Medical Biometry and Informatics, 4 Department of Pathology, University of Heidelberg, Heidelberg, Germany ; 5 Hepatology Unit, Clinic Beau-Site Hirslanden, Bern, Switzerland ; 6 Erstwhile: Division of Toxicology and Cancer Risk Factors, German Cancer Research Centre (DKFZ), Heidelberg, Germany
| | - Sebastian Mueller
- 1 Department of Paediatrics, University of Heidelberg, Heidelberg, Germany ; 2 Alcohol Research Centre, University of Heidelberg and Department of Medicine (Gastroenterology & Hepatology), Salem Medical Centre, Heidelberg, Germany ; 3 Institute of Medical Biometry and Informatics, 4 Department of Pathology, University of Heidelberg, Heidelberg, Germany ; 5 Hepatology Unit, Clinic Beau-Site Hirslanden, Bern, Switzerland ; 6 Erstwhile: Division of Toxicology and Cancer Risk Factors, German Cancer Research Centre (DKFZ), Heidelberg, Germany
| | - Helmut Bartsch
- 1 Department of Paediatrics, University of Heidelberg, Heidelberg, Germany ; 2 Alcohol Research Centre, University of Heidelberg and Department of Medicine (Gastroenterology & Hepatology), Salem Medical Centre, Heidelberg, Germany ; 3 Institute of Medical Biometry and Informatics, 4 Department of Pathology, University of Heidelberg, Heidelberg, Germany ; 5 Hepatology Unit, Clinic Beau-Site Hirslanden, Bern, Switzerland ; 6 Erstwhile: Division of Toxicology and Cancer Risk Factors, German Cancer Research Centre (DKFZ), Heidelberg, Germany
| | - Helmut K Seitz
- 1 Department of Paediatrics, University of Heidelberg, Heidelberg, Germany ; 2 Alcohol Research Centre, University of Heidelberg and Department of Medicine (Gastroenterology & Hepatology), Salem Medical Centre, Heidelberg, Germany ; 3 Institute of Medical Biometry and Informatics, 4 Department of Pathology, University of Heidelberg, Heidelberg, Germany ; 5 Hepatology Unit, Clinic Beau-Site Hirslanden, Bern, Switzerland ; 6 Erstwhile: Division of Toxicology and Cancer Risk Factors, German Cancer Research Centre (DKFZ), Heidelberg, Germany
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Chiang VSC, Quek SY. The relationship of red meat with cancer: Effects of thermal processing and related physiological mechanisms. Crit Rev Food Sci Nutr 2015; 57:1153-1173. [DOI: 10.1080/10408398.2014.967833] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
| | - Siew-Young Quek
- Department of Food Sciences, School of Chemistry Sciences, The University of Auckland, Auckland, New Zealand
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Comprehensive DNA adduct analysis reveals pulmonary inflammatory response contributes to genotoxic action of magnetite nanoparticles. Int J Mol Sci 2015; 16:3474-92. [PMID: 25658799 PMCID: PMC4346908 DOI: 10.3390/ijms16023474] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2014] [Revised: 01/06/2015] [Accepted: 01/30/2015] [Indexed: 12/17/2022] Open
Abstract
Nanosized-magnetite (MGT) is widely utilized in medicinal and industrial fields; however, its toxicological properties are not well documented. In our previous report, MGT showed genotoxicity in both in vitro and in vivo assay systems, and it was suggested that inflammatory responses exist behind the genotoxicity. To further clarify mechanisms underlying the genotoxicity, a comprehensive DNA adduct (DNA adductome) analysis was conducted using DNA samples derived from the lungs of mice exposed to MGT. In total, 30 and 42 types of DNA adducts were detected in the vehicle control and MGT-treated groups, respectively. Principal component analysis (PCA) against a subset of DNA adducts was applied and several adducts, which are deduced to be formed by inflammation or oxidative stress, as the case of etheno-deoxycytidine (εdC), revealed higher contributions to MGT exposure. By quantitative-LC-MS/MS analysis, εdC levels were significantly higher in MGT-treated mice than those of the vehicle control. Taken together with our previous data, it is suggested that inflammatory responses might be involved in the genotoxicity induced by MGT in the lungs of mice.
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10
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Cui S, Li H, Wang S, Jiang X, Zhang S, Zhang R, Sun X. Ultrasensitive UPLC-MS-MS method for the quantitation of etheno-DNA adducts in human urine. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2014; 11:10902-14. [PMID: 25337939 PMCID: PMC4211013 DOI: 10.3390/ijerph111010902] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/15/2014] [Revised: 09/30/2014] [Accepted: 10/07/2014] [Indexed: 11/23/2022]
Abstract
Etheno-DNA adducts are generated from the metabolism of exogenous carcinogens and endogenous lipid peroxidation. We and others have previously reported that 1,N6-ethenodeoxyadenosine (εdA) and 3,N4-ethenodeoxycytidine (εdC) are present in human urine and can be utilized as biomarkers of oxidative stress. In this study, we report a new ultrasensitive UPLC-ESI-MS/MS method for the analysis of εdA and εdC in human urine, capable of detecting 0.5 fmol εdA and 0.3 fmol εdC in 1.0 mL of human urine, respectively. For validation of the method, 20 human urine samples were analyzed, and the results revealed that the mean levels of εdA and εdC (SD) fmol/µmol creatinine are 5.82 ± 2.11 (range 3.0–9.5) for εdA and 791.4 ± 328.8 (range 116.7–1264.9) for εdC in occupational benzene-exposed workers and 2.10 ± 1.32 (range 0.6–4.7) for εdA and 161.8 ± 200.9 (range 1.8–557.5) for εdC in non-benzene-exposed workers, respectively. The ultrasensitive detection method is thus suitable for applications in human biomonitoring and molecular epidemiology studies.
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Affiliation(s)
- Shiwei Cui
- Key Laboratory of Chemical Safety and Health, Chinese Center for Disease Control and Prevention, Beijing 100050, China.
| | - Haibin Li
- Key Laboratory of Chemical Safety and Health, Chinese Center for Disease Control and Prevention, Beijing 100050, China.
| | - Shaojia Wang
- Key Laboratory of Chemical Safety and Health, Chinese Center for Disease Control and Prevention, Beijing 100050, China.
| | - Xiao Jiang
- Key Laboratory of Chemical Safety and Health, Chinese Center for Disease Control and Prevention, Beijing 100050, China.
| | - Shusheng Zhang
- Department of Chemistry, Zhengzhou University, Zhengzhou 450001, Henan province, China.
| | - Rongjie Zhang
- Henan Center for Disease Control and Prevention, Zhengzhou 450016, Henan province, China.
| | - Xin Sun
- Key Laboratory of Chemical Safety and Health, Chinese Center for Disease Control and Prevention, Beijing 100050, China.
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11
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Linhart K, Bartsch H, Seitz HK. The role of reactive oxygen species (ROS) and cytochrome P-450 2E1 in the generation of carcinogenic etheno-DNA adducts. Redox Biol 2014; 3:56-62. [PMID: 25462066 PMCID: PMC4297928 DOI: 10.1016/j.redox.2014.08.009] [Citation(s) in RCA: 119] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2014] [Revised: 08/19/2014] [Accepted: 08/25/2014] [Indexed: 12/30/2022] Open
Abstract
Exocyclic etheno-DNA adducts are mutagenic and carcinogenic and are formed by the reaction of lipidperoxidation (LPO) products such as 4-hydoxynonenal or malondialdehyde with DNA bases. LPO products are generated either via inflammation driven oxidative stress or via the induction of cytochrome P-450 2E1 (CYP2E1). In the liver CYP2E1 is induced by various compounds including free fatty acids, acetone and ethanol. Increased levels of CYP2E1 and thus, oxidative stress are observed in the liver of patients with non-alcoholic steatohepatitis (NASH) as well as in the chronic alcoholic. In addition, chronic ethanol ingestion also increases CYP2E1 in the mucosa of the oesophagus and colon. In all these tissues CYP2E1 correlates significantly with the levels of carcinogenic etheno-DNA adducts. In contrast, in patients with non-alcoholic steatohepatitis (NASH) hepatic etheno-DNA adducts do not correlate with CYP2E1 indicating that in NASH etheno-DNA adducts formation is predominately driven by inflammation rather than by CYP2E1 induction. Since etheno-DNA adducts are strong mutagens producing various types of base pair substitution mutations as well as other types of genetic damage, it is strongly believed that they are involved in ethanol mediated carcinogenesis primarily driven by the induction of CYP2E1. Cytochrome P-450 2E1 is induced following chronic ethanol ingestion. CYP2E1 correlates with carcinogenic etheno-DNA formation. CYP2E1 and oxidative stress are important mechanisms in alcohol mediated carcinogenesis in the liver, undefined and colon. In NASH hepatic etheno-DNA adducts occur but possible due to inflammation.
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Affiliation(s)
- Kirsten Linhart
- Centre of Alcohol Research, University of Heidelberg, Heidelberg, Germany
| | - Helmut Bartsch
- Department of Medicine (Gastroenterology & Hepatology), Salem Medical Centre, Heidelberg, Germany
| | - Helmut K Seitz
- Division of Toxicology and Cancer Risk Factors, German Cancer Research Centre (DKFZ), Heidelberg, Germany.
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Linhart K, Bartsch H, Seitz HK. The role of reactive oxygen species (ROS) and cytochrome P-450 2E1 in the generation of carcinogenic etheno-DNA adducts. Redox Biol 2014. [PMID: 25462066 DOI: 10.1016/j.redo-x.2014.08.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023] Open
Abstract
Exocyclic etheno-DNA adducts are mutagenic and carcinogenic and are formed by the reaction of lipidperoxidation (LPO) products such as 4-hydoxynonenal or malondialdehyde with DNA bases. LPO products are generated either via inflammation driven oxidative stress or via the induction of cytochrome P-450 2E1 (CYP2E1). In the liver CYP2E1 is induced by various compounds including free fatty acids, acetone and ethanol. Increased levels of CYP2E1 and thus, oxidative stress are observed in the liver of patients with non-alcoholic steatohepatitis (NASH) as well as in the chronic alcoholic. In addition, chronic ethanol ingestion also increases CYP2E1 in the mucosa of the oesophagus and colon. In all these tissues CYP2E1 correlates significantly with the levels of carcinogenic etheno-DNA adducts. In contrast, in patients with non-alcoholic steatohepatitis (NASH) hepatic etheno-DNA adducts do not correlate with CYP2E1 indicating that in NASH etheno-DNA adducts formation is predominately driven by inflammation rather than by CYP2E1 induction. Since etheno-DNA adducts are strong mutagens producing various types of base pair substitution mutations as well as other types of genetic damage, it is strongly believed that they are involved in ethanol mediated carcinogenesis primarily driven by the induction of CYP2E1.
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Affiliation(s)
- Kirsten Linhart
- Centre of Alcohol Research, University of Heidelberg, Heidelberg, Germany
| | - Helmut Bartsch
- Department of Medicine (Gastroenterology & Hepatology), Salem Medical Centre, Heidelberg, Germany
| | - Helmut K Seitz
- Division of Toxicology and Cancer Risk Factors, German Cancer Research Centre (DKFZ), Heidelberg, Germany.
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