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Tang S, Wang Q, Sun K, Song Y, Liu R, Tan X, Li H, Lv Y, Yang F, Zhao J, Li S, Bi P, Yang J, Zhu Z, Chen D, Chuan Z, Luo X, Hu Z, Liu Y, Li Z, Ke T, Jiang D, Zheng K, Yang R, Chen K, Guo R. Metabolic Heterogeneity and Potential Immunotherapeutic Responses Revealed by Single-Cell Transcriptomics of Breast Cancer. Apoptosis 2024:10.1007/s10495-024-01952-7. [PMID: 38578322 DOI: 10.1007/s10495-024-01952-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/02/2024] [Indexed: 04/06/2024]
Abstract
BACKGROUND Breast cancer (BC) exhibits remarkable heterogeneity. However, the transcriptomic heterogeneity of BC at the single-cell level has not been fully elucidated. METHODS We acquired BC samples from 14 patients. Single-cell RNA sequencing (scRNA-seq), bioinformatic analyses, along with immunohistochemistry (IHC) and immunofluorescence (IF) assays were carried out. RESULTS According to the scRNA-seq results, 10 different cell types were identified. We found that Cancer-Associated Fibroblasts (CAFs) exhibited distinct biological functions and may promote resistance to therapy. Metabolic analysis of tumor cells revealed heterogeneity in glycolysis, gluconeogenesis, and fatty acid synthetase reprogramming, which led to chemotherapy resistance. Furthermore, patients with multiple metastases and progression were predicted to benefit from immunotherapy based on a heterogeneity analysis of T cells and tumor cells. CONCLUSIONS Our findings provide a comprehensive understanding of the heterogeneity of BC, provide comprehensive insight into the correlation between cancer metabolism and chemotherapy resistance, and enable the prediction of immunotherapy responses based on T-cell heterogeneity.
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Affiliation(s)
- Shicong Tang
- Department of Breast Surgery, Cancer Hospital of Yunnan Province, The Third Affiliated Hospital of Kunming Medical University, Kunming, 650118, Yunnan, People's Republic of China.
| | - Qing Wang
- Department of Breast Surgery, Cancer Hospital of Yunnan Province, The Third Affiliated Hospital of Kunming Medical University, Kunming, 650118, Yunnan, People's Republic of China
| | - Ke Sun
- State Key Laboratory of Primate Biomedical Research, Institute of Primate Translational Medicine, Kunming University of Science and Technology, Kunming, Yunnan, 650500, People's Republic of China
- Yunnan Key Laboratory of Primate Biomedical Research, Kunming, Yunnan, 650500, People's Republic of China
| | - Ying Song
- Department of Breast Surgery, Cancer Hospital of Yunnan Province, The Third Affiliated Hospital of Kunming Medical University, Kunming, 650118, Yunnan, People's Republic of China
| | - Rui Liu
- Department of Breast Surgery, Cancer Hospital of Yunnan Province, The Third Affiliated Hospital of Kunming Medical University, Kunming, 650118, Yunnan, People's Republic of China
| | - Xin Tan
- Department of Breast Surgery, Cancer Hospital of Yunnan Province, The Third Affiliated Hospital of Kunming Medical University, Kunming, 650118, Yunnan, People's Republic of China
| | - Huimeng Li
- Department of Breast Surgery, Cancer Hospital of Yunnan Province, The Third Affiliated Hospital of Kunming Medical University, Kunming, 650118, Yunnan, People's Republic of China
| | - Yafeng Lv
- Department of Breast Surgery, Cancer Hospital of Yunnan Province, The Third Affiliated Hospital of Kunming Medical University, Kunming, 650118, Yunnan, People's Republic of China
| | - Fuying Yang
- Department of Breast Surgery, Cancer Hospital of Yunnan Province, The Third Affiliated Hospital of Kunming Medical University, Kunming, 650118, Yunnan, People's Republic of China
| | - Jiawen Zhao
- Department of Breast Surgery, Cancer Hospital of Yunnan Province, The Third Affiliated Hospital of Kunming Medical University, Kunming, 650118, Yunnan, People's Republic of China
| | - Sijia Li
- Department of Breast Surgery, Cancer Hospital of Yunnan Province, The Third Affiliated Hospital of Kunming Medical University, Kunming, 650118, Yunnan, People's Republic of China
| | - Pingping Bi
- Department of Breast Surgery, Cancer Hospital of Yunnan Province, The Third Affiliated Hospital of Kunming Medical University, Kunming, 650118, Yunnan, People's Republic of China
| | - Jiali Yang
- Department of Breast Surgery, Cancer Hospital of Yunnan Province, The Third Affiliated Hospital of Kunming Medical University, Kunming, 650118, Yunnan, People's Republic of China
| | - Zhengna Zhu
- State Key Laboratory of Primate Biomedical Research, Institute of Primate Translational Medicine, Kunming University of Science and Technology, Kunming, Yunnan, 650500, People's Republic of China
| | - Dong Chen
- Department of Ultrasound, Caner Hospital of Yunnan Province, The Third Affiliated Hospital of Kunming Medical University, Kunming, 650118, Yunnan, People's Republic of China
| | - Zhirui Chuan
- Department of Ultrasound, Caner Hospital of Yunnan Province, The Third Affiliated Hospital of Kunming Medical University, Kunming, 650118, Yunnan, People's Republic of China
| | - Xiaomao Luo
- Department of Ultrasound, Caner Hospital of Yunnan Province, The Third Affiliated Hospital of Kunming Medical University, Kunming, 650118, Yunnan, People's Republic of China
| | - Zaoxiu Hu
- Department of Pathology, Caner Hospital of Yunnan Province, The Third Affiliated Hospital of Kunming Medical University, Kunming, 650118, Yunnan, People's Republic of China
| | - Ying Liu
- Department of Pathology, Caner Hospital of Yunnan Province, The Third Affiliated Hospital of Kunming Medical University, Kunming, 650118, Yunnan, People's Republic of China
| | - Zhenhui Li
- Department of Radiology, Caner Hospital of Yunnan Province, The Third Affiliated Hospital of Kunming Medical University, Kunming, 650118, Yunnan, People's Republic of China
| | - Tengfei Ke
- Department of Radiology, Caner Hospital of Yunnan Province, The Third Affiliated Hospital of Kunming Medical University, Kunming, 650118, Yunnan, People's Republic of China
| | - Dewei Jiang
- Key Laboratory of Animal Models and Human, Disease Mechanisms of Chinese Academy of Sciences and Yunnan Province, Kunming Institute of Zoology, Kunming, Yunnan, China
- Kunming College of Life Sciences, University of Chinese Academy Sciences, Kunming, Yunnan, China
| | - Kai Zheng
- Department of Breast Surgery, Cancer Hospital of Yunnan Province, The Third Affiliated Hospital of Kunming Medical University, Kunming, 650118, Yunnan, People's Republic of China
| | - Rirong Yang
- Center for Genomic and Personalized Medicine, Guangxi key Laboratory for Genomic and Personalized Medicine, Guangxi Collaborative Innovation Center for Genomic and Personalized Medicine, Guangxi Medical University, Nanning, Guangxi, 530021, People's Republic of China.
- Department of Immunology, School of Basic Medical Sciences, Guangxi Medical University, Guangxi, 530021, People's Republic of China.
| | - Kai Chen
- State Key Laboratory of Primate Biomedical Research, Institute of Primate Translational Medicine, Kunming University of Science and Technology, Kunming, Yunnan, 650500, People's Republic of China.
- Yunnan Key Laboratory of Primate Biomedical Research, Kunming, Yunnan, 650500, People's Republic of China.
| | - Rong Guo
- Department of Breast Surgery, Cancer Hospital of Yunnan Province, The Third Affiliated Hospital of Kunming Medical University, Kunming, 650118, Yunnan, People's Republic of China.
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2
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Jiang N, Zhang P, Shen W, Zhang Y, Zhou W. Clinical and experimental research progress on neurotoxicity of sulfur mustard and its possible mechanisms. Toxicology 2023; 483:153372. [PMID: 36356660 DOI: 10.1016/j.tox.2022.153372] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2022] [Revised: 10/28/2022] [Accepted: 11/05/2022] [Indexed: 11/09/2022]
Abstract
Sulfur mustard (SM), an extremely reactive alkylating toxicant, which poses a continuing threat to both military and civilian populations. SM targets three major organs including skin, eyes and lungs. In recent years, more and more clinical findings have shown that cognitive and emotional disorders in veterans intoxicated with SM, such as anxiety, depression, apathy, cognitive decline and so on, which indicated the long time toxic effects on mental and neurological health of SM. The experimental studies in animal and cell models have also found neurotoxicity which are similar to clinical results. However, these neuropsychological problems are not studied well in victims of SM and the mental and neurological complications are often not subjected to treatment or undertreated. Until now, the exact mechanism of the action of SM toxicity has not been elucidated and no specific therapy for its poisoning exists. Therefore, the studies on neurotoxicity of SM should be strengthened. This review summarizes the main progress of clinical and experimental researches on neurotoxicity of SM for the past few years.
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Affiliation(s)
- Ning Jiang
- Beijing Institute of Pharmacology and Toxicology, State Key Laboratory of Toxicology and Medical Countermeasures, Beijing 100850, China
| | - Pei Zhang
- Beijing Institute of Pharmacology and Toxicology, State Key Laboratory of Toxicology and Medical Countermeasures, Beijing 100850, China; School of Pharmacy, Yantai University, Shandong 264005, China
| | - Wei Shen
- Beijing Institute of Pharmacology and Toxicology, State Key Laboratory of Toxicology and Medical Countermeasures, Beijing 100850, China; School of Chinese Materia Medica, Tianjin University of Traditional Chinese Medicine, Tianjin 300193, China
| | - Yongxiang Zhang
- Beijing Institute of Pharmacology and Toxicology, State Key Laboratory of Toxicology and Medical Countermeasures, Beijing 100850, China.
| | - WenXia Zhou
- Beijing Institute of Pharmacology and Toxicology, State Key Laboratory of Toxicology and Medical Countermeasures, Beijing 100850, China; School of Pharmacy, Yantai University, Shandong 264005, China.
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3
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Effects of Hibiscus sabdariffa Calyxes Aqueous Extract on Antioxidant Status and Histopathology in Mammary Tumor-Induced in Rats. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2022; 2022:9872788. [PMID: 35502172 PMCID: PMC9056213 DOI: 10.1155/2022/9872788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Revised: 03/05/2022] [Accepted: 03/21/2022] [Indexed: 11/18/2022]
Abstract
Breast cancer is a major threat worldwide. Hibiscus sabdariffa is widely consumed as beverage in sub-Saharan Africa for its anticancer potential. The present study therefore aimed at scientifically verifying its anticancer effect in rats. For this, 48 Wistar rats (∼55 days) were treated either with tamoxifen at 3.3 mg/kg BW (standard) or with a decoction of H. sabdariffa (125, 250, and 500 mg/kg BW) or distilled water (vehicle). Breast cancer was induced by a single dose of 50 mg/kg of 7,12-dimethylbenz(a)anthracene (DMBA). At the end of the 21 weeks of treatment, the tumor incidence, tumor morphology, histopathology, as well as some biochemical parameters in the tumors were assessed. As a result, 86% of DMBA's rats developed mammary tumors. The H. sabdariffa extract (125 and 250 mg/kg) reduced tumor incidence by 63% and 75%, respectively; inhibited tumor burden by 84.86% and 38.78%, respectively, and decreased tumor volume by more than 72% compared to the DMBA group. It also protected rats against DMBA-induced diffuse breast neoplasia, and the optimal effect was recorded at 125 mg/kg. Furthermore, it significantly increases the SOD activity and decreases the MDA level. In summary, H. sabdariffa has antibreast tumor and antioxidant properties in rats, which could justify its common use to treat cancer.
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Lu K, Hsiao YC, Liu CW, Schoeny R, Gentry R, Starr TB. A Review of Stable Isotope Labeling and Mass Spectrometry Methods to Distinguish Exogenous from Endogenous DNA Adducts and Improve Dose-Response Assessments. Chem Res Toxicol 2021; 35:7-29. [PMID: 34910474 DOI: 10.1021/acs.chemrestox.1c00212] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Cancer remains the second most frequent cause of death in human populations worldwide, which has been reflected in the emphasis placed on management of risk from environmental chemicals considered to be potential human carcinogens. The formation of DNA adducts has been considered as one of the key events of cancer, and persistence and/or failure of repair of these adducts may lead to mutation, thus initiating cancer. Some chemical carcinogens can produce DNA adducts, and DNA adducts have been used as biomarkers of exposure. However, DNA adducts of various types are also produced endogenously in the course of normal metabolism. Since both endogenous physiological processes and exogenous exposure to xenobiotics can cause DNA adducts, the differentiation of the sources of DNA adducts can be highly informative for cancer risk assessment. This review summarizes a highly applicable methodology, termed stable isotope labeling and mass spectrometry (SILMS), that is superior to previous methods, as it not only provides absolute quantitation of DNA adducts but also differentiates the exogenous and endogenous origins of DNA adducts. SILMS uses stable isotope-labeled substances for exposure, followed by DNA adduct measurement with highly sensitive mass spectrometry. Herein, the utilities and advantage of SILMS have been demonstrated by the rich data sets generated over the last two decades in improving the risk assessment of chemicals with DNA adducts being induced by both endogenous and exogenous sources, such as formaldehyde, vinyl acetate, vinyl chloride, and ethylene oxide.
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Affiliation(s)
- Kun Lu
- Department of Environmental Sciences and Engineering, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Yun-Chung Hsiao
- Department of Environmental Sciences and Engineering, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Chih-Wei Liu
- Department of Environmental Sciences and Engineering, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Rita Schoeny
- Rita Schoeny LLC, 726 Fifth Street NE, Washington, D.C. 20002, United States
| | - Robinan Gentry
- Ramboll US Consulting, Inc., Monroe, Louisiana 71201, United States
| | - Thomas B Starr
- Department of Environmental Sciences and Engineering, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States.,TBS Associates, 7500 Rainwater Road, Raleigh, North Carolina 27615, United States
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5
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Orlova OI, Karakashev GV, Savel’eva EI. Simultaneous Determination of Sulfur Mustard Adducts with Guanine and Acetylcysteine in Urine by High-Resolution High-Performance Liquid Chromatography–Tandem Mass Spectrometry. JOURNAL OF ANALYTICAL CHEMISTRY 2020. [DOI: 10.1134/s1061934820060155] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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6
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Orlova OI, Savel’eva EI, Karakashev GV. Methods of determination of sulfur yperite–DNA adducts. JOURNAL OF ANALYTICAL CHEMISTRY 2017. [DOI: 10.1134/s1061934817010099] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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7
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Zuo YT, Hu Y, Lu WW, Cao JJ, Wang F, Han X, Lu WQ, Liu AL. Toxicity of 2,6-dichloro-1,4-benzoquinone and five regulated drinking water disinfection by-products for the Caenorhabditis elegans nematode. JOURNAL OF HAZARDOUS MATERIALS 2017; 321:456-463. [PMID: 27669387 DOI: 10.1016/j.jhazmat.2016.09.038] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2016] [Revised: 09/15/2016] [Accepted: 09/16/2016] [Indexed: 06/06/2023]
Abstract
Scarce toxicological data are available for 2,6-dichloro-1,4-benzoquinone (DCBQ), an emerging water disinfection by-product (DBP) that is of potential public health concern. This study investigated the effects of DCBQ on the lethality, respiration rate, and DNA damage in the Caenorhabditis elegans nematode. Meanwhile, the toxic effects of five regulated DBPs, dichloroacetic acid (DCA), trichloroacetic acid (TCA), monobromoacetic acid (MBA), dibromoacetic acid (DBA), and N-nitrosodimethylamine (NDMA), have also been evaluated. The tested DBPs increased the lethality and inhibited the respiration of C. elegans with an identical order of toxicity as follows: DCBQ>MBA>DBA>DCA>TCA>NDMA. The EC50 value (median concentration causing 50% reduction in respiration compared with untreated C. elegans) is at least 30-fold lower than the corresponding LC50 value (median lethal concentration). Exposure to DCBQ and NDMA, but not to MBA, DBA, DCA, or TCA, resulted in DNA damage to C. elegans. The study suggested that DCBQ was more potent in inducing general toxicity than some regulated DBPs, and it revealed the in vivo genotoxic effect of DCBQ. Furthermore, the C. elegans-based bioassays may provide potentially useful tools for the toxicology assessment and ranking of DBPs.
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Affiliation(s)
- Yu-Ting Zuo
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
| | - Yu Hu
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
| | - Wei-Wei Lu
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
| | - Jing-Jing Cao
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
| | - Fan Wang
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
| | - Xue Han
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
| | - Wen-Qing Lu
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
| | - Ai-Lin Liu
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, PR China.
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8
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Mutagenic and carcinogenic structural alerts and their mechanisms of action. Arh Hig Rada Toksikol 2016; 67:169-182. [DOI: 10.1515/aiht-2016-67-2801] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Accepted: 09/01/2016] [Indexed: 12/24/2022] Open
Abstract
Abstract
Knowing the mutagenic and carcinogenic properties of chemicals is very important for their hazard (and risk) assessment. One of the crucial events that trigger genotoxic and sometimes carcinogenic effects is the forming of adducts between chemical compounds and nucleic acids and histones. This review takes a look at the mechanisms related to specific functional groups (structural alerts or toxicophores) that may trigger genotoxic or epigenetic effects in the cells. We present up-to-date information about defined structural alerts with their mechanisms and the software based on this knowledge (QSAR models and classification schemes).
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9
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Hemeryck LY, Moore SA, Vanhaecke L. Mass Spectrometric Mapping of the DNA Adductome as a Means to Study Genotoxin Exposure, Metabolism, and Effect. Anal Chem 2016; 88:7436-46. [DOI: 10.1021/acs.analchem.6b00863] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Lieselot Y. Hemeryck
- Laboratory of Chemical Analysis, Department
of Veterinary Public Health and Food Safety, Faculty of Veterinary
Medicine, Ghent University, Salisburylaan 133, Merelbeke, B-9820, Belgium
| | - Sharon A. Moore
- School of Pharmacy and Biomolecular Sciences, Faculty
of Science, Liverpool John Moores University, Liverpool, L3 3AF, United Kingdom
| | - Lynn Vanhaecke
- Laboratory of Chemical Analysis, Department
of Veterinary Public Health and Food Safety, Faculty of Veterinary
Medicine, Ghent University, Salisburylaan 133, Merelbeke, B-9820, Belgium
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10
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Hemeryck LY, Rombouts C, Hecke TV, Van Meulebroek L, Bussche JV, De Smet S, Vanhaecke L. In vitro DNA adduct profiling to mechanistically link red meat consumption to colon cancer promotion. Toxicol Res (Camb) 2016; 5:1346-1358. [PMID: 30090439 DOI: 10.1039/c6tx00079g] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Accepted: 06/19/2016] [Indexed: 01/14/2023] Open
Abstract
Colorectal cancer (CRC) is the third most common cancer type in the world. Epidemiological research has demonstrated that both red and processed meat consumption significantly contribute to CRC risk. In this study, red meat toxicity was investigated by means of simulated gastrointestinal conditions, malondialdehyde (MDA) analysis and UHPLC-(HR)MS(/MS) based DNA adductomics. Since dairy products with high calcium content are associated with a decreased CRC-risk, the possible CRC-protective effects of calcium were assessed as well. The obtained results confirmed the earlier reported finding that heme-rich meat stimulates lipid peroxidation and O6-carboxymethylguanine (O6-CMG) DNA adduct formation during digestion. Calcium carbonate (CaCO3) supplementation resulted in both toxic and anti-toxic effects; i.e. stimulation of O6-CMG production, but reduction of MDA formation. DNA adductome mapping of meat digests revealed a significant interindividual variability. The observed DNA adduct profile also differed according to the digested meat type, uncovering different putative DNA adducts that seem to be associated with digestion of beef or chicken with or without supplemented CaCO3. Formamidopyrimidine-adenine was found to be discriminative for meat digests without added CaCO3, carboxyethylcytosine was significantly higher in beef digests and methoxymethylcytosine (or its hydroxyethylcytosine isomer) was found to be lower in meat digests supplemented with CaCO3. These results demonstrate that DNA adduct formation may be involved in the pathway that links red meat digestion to CRC promotion. In addition, the possible CRC-protective attributes of calcium through anti-oxidant actions could be documented.
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Affiliation(s)
- Lieselot Y Hemeryck
- Laboratory of Chemical Analysis , Department of Veterinary Public Health and Food Safety , Faculty of Veterinary Medicine , Ghent University , Salisburylaan 133 , B-9820 Merelbeke , Belgium .
| | - Caroline Rombouts
- Laboratory of Chemical Analysis , Department of Veterinary Public Health and Food Safety , Faculty of Veterinary Medicine , Ghent University , Salisburylaan 133 , B-9820 Merelbeke , Belgium .
| | - Thomas Van Hecke
- Laboratory of Animal Nutrition and Animal Product Quality , Department of Animal Production , Faculty of Bioscience Engineering , Ghent University , Proefhoevestraat 10 , B-9090 Melle , Belgium
| | - Lieven Van Meulebroek
- Laboratory of Chemical Analysis , Department of Veterinary Public Health and Food Safety , Faculty of Veterinary Medicine , Ghent University , Salisburylaan 133 , B-9820 Merelbeke , Belgium .
| | - Julie Vanden Bussche
- Laboratory of Chemical Analysis , Department of Veterinary Public Health and Food Safety , Faculty of Veterinary Medicine , Ghent University , Salisburylaan 133 , B-9820 Merelbeke , Belgium .
| | - Stefaan De Smet
- Laboratory of Animal Nutrition and Animal Product Quality , Department of Animal Production , Faculty of Bioscience Engineering , Ghent University , Proefhoevestraat 10 , B-9090 Melle , Belgium
| | - Lynn Vanhaecke
- Laboratory of Chemical Analysis , Department of Veterinary Public Health and Food Safety , Faculty of Veterinary Medicine , Ghent University , Salisburylaan 133 , B-9820 Merelbeke , Belgium .
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11
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Hemeryck LY, Vanhaecke L. Diet-related DNA adduct formation in relation to carcinogenesis. Nutr Rev 2016; 74:475-89. [PMID: 27330144 DOI: 10.1093/nutrit/nuw017] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The human diet contributes significantly to the initiation and promotion of carcinogenesis. It has become clear that the human diet contains several groups of natural foodborne chemicals that are at least in part responsible for the genotoxic, mutagenic, and carcinogenic potential of certain foodstuffs. Electrophilic chemicals are prone to attack nucleophilic sites in DNA, resulting in the formation of altered nucleobases, also known as DNA adducts. Since DNA adduct formation is believed to signal the onset of chemically induced carcinogenesis, the DNA adduct-inducing potential of certain foodstuffs has been investigated to gain more insight into diet-related pathways of carcinogenesis. Many studies have investigated diet-related DNA adduct formation. This review summarizes work on known or suspected dietary carcinogens and the role of DNA adduct formation in hypothesized carcinogenesis pathways.
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Affiliation(s)
- Lieselot Y Hemeryck
- L.Y. Hemeryck and L. Vanhaecke are with the Laboratory of Chemical Analysis, Department of Veterinary Public Health and Food Safety, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium.
| | - Lynn Vanhaecke
- L.Y. Hemeryck and L. Vanhaecke are with the Laboratory of Chemical Analysis, Department of Veterinary Public Health and Food Safety, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium
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12
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D’Ulivo L, Feng YL. A Novel Open Tubular Capillary Electrochromatographic Method for Differentiating the DNA Interaction Affinity of Environmental Contaminants. PLoS One 2016; 11:e0153081. [PMID: 27055261 PMCID: PMC4824506 DOI: 10.1371/journal.pone.0153081] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Accepted: 03/23/2016] [Indexed: 11/18/2022] Open
Abstract
The interaction of chemicals with DNA may lead to genotoxicity, mutation or carcinogenicity. A simple open tubular capillary electrochromatographic method is proposed to rapidly assess the interaction affinity of three environmental contaminants (1,4-phenylenediamine, pyridine and 2,4-diaminotoluene) to DNA by measuring their retention in the capillaries coated with DNA probes. DNA oligonucleotide probes were immobilized on the inner wall of a fused silica capillary that was first derivatized with 3-(aminopropyl)-triethoxysilane (APTES). The difference in retention times and factors was considered as the difference in interaction affinity of the contaminants to the DNA probes. The interaction of the contaminants with both double-stranded (dsDNA) and single-stranded DNA (ssDNA) coatings was compared. Retention factors of 1,4-phenylenediamine, pyridine and 2,4-diaminotoluene in the capillary coated with ssDNA probe were 0.29, 0.42, and 0.44, respectively. A similar trend was observed in the capillary coated with dsDNA, indicating that 2,4-diaminotoluene has the highest affinity among the three contaminants. The relative standard deviation (RSD) for the retention factors was in the range of 0.05-0.69% (n = 3). The results demonstrated that the developed technique could be applied for preliminary screening purpose to provide DNA interaction affinity information of various environmental contaminants.
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Affiliation(s)
- Lucia D’Ulivo
- Exposure and Biomonitoring Division, Environmental Health Science and Research Bureau, Environmental and Radiation Health Sciences Directorate, Health Canada, Ottawa, Canada
| | - Yong-Lai Feng
- Exposure and Biomonitoring Division, Environmental Health Science and Research Bureau, Environmental and Radiation Health Sciences Directorate, Health Canada, Ottawa, Canada
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13
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Burt T, Yoshida K, Lappin G, Vuong L, John C, de Wildt SN, Sugiyama Y, Rowland M. Microdosing and Other Phase 0 Clinical Trials: Facilitating Translation in Drug Development. Clin Transl Sci 2016; 9:74-88. [PMID: 26918865 PMCID: PMC5351314 DOI: 10.1111/cts.12390] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2016] [Revised: 02/18/2016] [Accepted: 02/18/2016] [Indexed: 12/13/2022] Open
Affiliation(s)
- T Burt
- Principal, Burt Consultancy, Durham, NC, 27705, USA
| | - K Yoshida
- Office of Clinical Pharmacology, Office of Translational Sciences, Center for Drug Evaluation and Research, US Food and Drug Administration, Silver Spring, MD, USA.,Oak Ridge Institution for Science and Education (ORISE) Fellow
| | - G Lappin
- Visiting Professor of Pharmacology School of Pharmacy University of Lincoln, Joseph Banks Laboratories, Lincoln, LN6 7DL, UK
| | - L Vuong
- Principal, LTV Consulting, Davis, CA, USA.,Clinical Advisor at BioCore, Seoul, South Korea
| | - C John
- Office of Clinical Pharmacology, Office of Translational Sciences, Center for Drug Evaluation and Research, US Food and Drug Administration, Silver Spring, MD, USA
| | - S N de Wildt
- Intensive Care and Pediatric Surgery, Erasmus MC Sophia Children's Hospital, Rotterdam, The Netherlands
| | - Y Sugiyama
- Sugiyama Laboratory, RIKEN Innovation Center, RIKEN, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa, 230-0045, Japan
| | - M Rowland
- Centre for Applied Pharmacokinetic Research, University of Manchester, Manchester, M13 9PT, UK.,Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, USA
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14
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Ghodke PP, Gore KR, Harikrishna S, Samanta B, Kottur J, Nair DT, Pradeepkumar PI. The N(2)-Furfuryl-deoxyguanosine Adduct Does Not Alter the Structure of B-DNA. J Org Chem 2016; 81:502-11. [PMID: 26650891 DOI: 10.1021/acs.joc.5b02341] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
N(2)-Furfuryl-deoxyguanosine (fdG) is carcinogenic DNA adduct that originates from furfuryl alcohol. It is also a stable structural mimic of the damage induced by the nitrofurazone family of antibiotics. For the structural and functional studies of this model N(2)-dG adduct, reliable and rapid access to fdG-modified DNAs are warranted. Toward this end, here we report the synthesis of fdG-modified DNAs using phosphoramidite chemistry involving only three steps. The functional integrity of the modified DNA has been verified by primer extension studies with DNA polymerases I and IV from E. coli. Introduction of fdG into a DNA duplex decreases the Tm by ∼1.6 °C/modification. Molecular dynamics simulations of a DNA duplex bearing the fdG adduct revealed that though the overall B-DNA structure is maintained, this lesion can disrupt W-C H-bonding, stacking interactions, and minor groove hydrations to some extent at the modified site, and these effects lead to slight variations in the local base pair parameters. Overall, our studies show that fdG is tolerated at the minor groove of the DNA to a better extent compared with other bulky DNA damages, and this property will make it difficult for the DNA repair pathways to detect this adduct.
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Affiliation(s)
- Pratibha P Ghodke
- Department of Chemistry, Indian Institute of Technology Bombay , Mumbai-400076, India
| | - Kiran R Gore
- Department of Chemistry, Indian Institute of Technology Bombay , Mumbai-400076, India.,Department of Chemistry, University of Mumbai , Mumbai-400098, India
| | - S Harikrishna
- Department of Chemistry, Indian Institute of Technology Bombay , Mumbai-400076, India
| | - Biswajit Samanta
- Department of Chemistry, Indian Institute of Technology Bombay , Mumbai-400076, India
| | - Jithesh Kottur
- Regional Centre for Biotechnology, NCR Biotech Science Cluster, Third Milestone, Faridabad-Gurgaon Expressway, Faridabad-121001, India.,Manipal University, Manipal-576104, India
| | - Deepak T Nair
- Regional Centre for Biotechnology, NCR Biotech Science Cluster, Third Milestone, Faridabad-Gurgaon Expressway, Faridabad-121001, India.,National Centre for Biological Sciences (NCBS-TIFR), GKVK Campus, Bellary Road, Bangalore-560065, India
| | - P I Pradeepkumar
- Department of Chemistry, Indian Institute of Technology Bombay , Mumbai-400076, India
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15
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Zhu W, Cromie MM, Cai Q, Lv T, Singh K, Gao W. Curcumin and vitamin E protect against adverse effects of benzo[a]pyrene in lung epithelial cells. PLoS One 2014; 9:e92992. [PMID: 24664296 PMCID: PMC3963982 DOI: 10.1371/journal.pone.0092992] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2013] [Accepted: 02/27/2014] [Indexed: 11/18/2022] Open
Abstract
Benzo[a]pyrene (BaP), a well-known environmental carcinogen, promotes oxidative stress and DNA damage. Curcumin and vitamin E (VE) have potent antioxidative activity that protects cells from oxidative stress and cellular damage. The objectives of the present study were to investigate the adverse effects of BaP on normal human lung epithelial cells (BEAS-2B), the potential protective effects of curcumin and VE against BaP-induced cellular damage, and the molecular mechanisms of action. MTT assay, flow cytometry, fluorescence microplate assay, HPLC, qRT-PCR, and western blot were performed to analyze cytotoxicity, cell cycle, reactive oxygen species (ROS), BaP diol-epoxidation (BPDE)-DNA adducts, gene expression, and protein expression, respectively. Curcumin or VE prevented cells from BaP-induced cell cycle arrest and growth inhibition, significantly suppressed BaP-induced ROS levels, and decreased BPDE-DNA adducts. While CYP1A1 and 1B1 were induced by BaP, these inductions were not significantly reduced by curcumin or VE. Moreover, the level of activated p53 and PARP-1 were significantly induced by BaP, whereas this induction was markedly reduced after curcumin and VE co-treatment. Survivin was significantly down-regulated by BaP, and curcumin significantly restored survivin expression in BaP-exposed cells. The ratio of Bax/Bcl-2 was also significantly increased in cells exposed to BaP and this increase was reversed by VE co-treatment. Taken together, BaP-induced cytotoxicity occurs through DNA damage, cell cycle arrest, ROS production, modulation of metabolizing enzymes, and the expression/activation of p53, PARP-1, survivin, and Bax/Bcl-2. Curcumin and VE could reverse some of these BaP-mediated alterations and therefore be effective natural compounds against the adverse effects of BaP in lung cells.
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Affiliation(s)
- Wenbin Zhu
- Department of Environmental Toxicology, The Institute of Environmental and Human Health, Texas Tech University, Lubbock, Texas, United States of America
| | - Meghan M. Cromie
- Department of Environmental Toxicology, The Institute of Environmental and Human Health, Texas Tech University, Lubbock, Texas, United States of America
| | - Qingsong Cai
- Department of Environmental Toxicology, The Institute of Environmental and Human Health, Texas Tech University, Lubbock, Texas, United States of America
| | - Tangfeng Lv
- Department of Environmental Toxicology, The Institute of Environmental and Human Health, Texas Tech University, Lubbock, Texas, United States of America
| | - Kamaleshwar Singh
- Department of Environmental Toxicology, The Institute of Environmental and Human Health, Texas Tech University, Lubbock, Texas, United States of America
| | - Weimin Gao
- Department of Environmental Toxicology, The Institute of Environmental and Human Health, Texas Tech University, Lubbock, Texas, United States of America
- * E-mail:
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16
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Yue L, Wei Y, Chen J, Shi H, Liu Q, Zhang Y, He J, Guo L, Zhang T, Xie J, Peng S. Abundance of Four Sulfur Mustard-DNA Adducts ex Vivo and in Vivo Revealed by Simultaneous Quantification in Stable Isotope Dilution–Ultrahigh Performance Liquid Chromatography–Tandem Mass Spectrometry. Chem Res Toxicol 2014; 27:490-500. [DOI: 10.1021/tx4003403] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Lijun Yue
- State Key Laboratory
of Antitoxic Drugs and Toxicology, and Laboratory of Toxicant Analysis,
Institute of Pharmacology and Toxicology, Academy of Military Medical
Sciences, No. 27 Taiping Road, Haidian District 100850, Beijing, China
- Beijing Institute
for Disease Control and Prevention, No. 20 Dongdajie Street, Fengtai District 100071, Beijing, China
| | - Yuxia Wei
- State Key Laboratory
of Antitoxic Drugs and Toxicology, and Laboratory of Toxicant Analysis,
Institute of Pharmacology and Toxicology, Academy of Military Medical
Sciences, No. 27 Taiping Road, Haidian District 100850, Beijing, China
| | - Jia Chen
- State Key Laboratory
of Antitoxic Drugs and Toxicology, and Laboratory of Toxicant Analysis,
Institute of Pharmacology and Toxicology, Academy of Military Medical
Sciences, No. 27 Taiping Road, Haidian District 100850, Beijing, China
| | - Huiqin Shi
- Beijing Institute
for Disease Control and Prevention, No. 20 Dongdajie Street, Fengtai District 100071, Beijing, China
| | - Qin Liu
- State Key Laboratory
of Antitoxic Drugs and Toxicology, and Laboratory of Toxicant Analysis,
Institute of Pharmacology and Toxicology, Academy of Military Medical
Sciences, No. 27 Taiping Road, Haidian District 100850, Beijing, China
| | - Yajiao Zhang
- State Key Laboratory
of Antitoxic Drugs and Toxicology, and Laboratory of Toxicant Analysis,
Institute of Pharmacology and Toxicology, Academy of Military Medical
Sciences, No. 27 Taiping Road, Haidian District 100850, Beijing, China
| | - Jun He
- Beijing Institute
for Disease Control and Prevention, No. 20 Dongdajie Street, Fengtai District 100071, Beijing, China
| | - Lei Guo
- State Key Laboratory
of Antitoxic Drugs and Toxicology, and Laboratory of Toxicant Analysis,
Institute of Pharmacology and Toxicology, Academy of Military Medical
Sciences, No. 27 Taiping Road, Haidian District 100850, Beijing, China
| | - Tingfen Zhang
- Beijing Institute
for Disease Control and Prevention, No. 20 Dongdajie Street, Fengtai District 100071, Beijing, China
| | - Jianwei Xie
- State Key Laboratory
of Antitoxic Drugs and Toxicology, and Laboratory of Toxicant Analysis,
Institute of Pharmacology and Toxicology, Academy of Military Medical
Sciences, No. 27 Taiping Road, Haidian District 100850, Beijing, China
| | - Shuangqing Peng
- Beijing Institute
for Disease Control and Prevention, No. 20 Dongdajie Street, Fengtai District 100071, Beijing, China
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17
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Sharma VK, Xiong W, Glick J, Vouros P. Determination of site selectivity of different carcinogens for preferential mutational hot spots in oligonucleotide fragments by ion-pair reversed-phase nano liquid chromatography tandem mass spectrometry. EUROPEAN JOURNAL OF MASS SPECTROMETRY (CHICHESTER, ENGLAND) 2014; 20:63-72. [PMID: 24881456 DOI: 10.1255/ejms.1268] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Ion-pair reversed-phase nano liquid chromatography coupled with nanospray ion trap mass spectrometry was used to investigate site selectivity of the known carcinogens N-acetoxy-2-acetylaminofluorene, N-hydroxy-4-aminobiphenyl and (+/-)-anti-benzo[a]pyrene diol epoxide with the synthetic double-strand 14-mer long oligonucleotide fragment of the p53 gene containing two mutational hot-spot codons (5'-P-ACC155 CGC156 GTC157 CGC158 GC/5'-GCG CGG ACG CGG GT). The investigation was performed using a monolithic polystyrene divinylbenzene capillary column and triethylammonium bicarbonate as an ion-pair reagent. The exact location of the carcinogen on the modified oligonucleotide backbone was determined using characteristic collision-induced dissociation fragmentation patterns obtained under negative-ion mode ionization. In all these cases, the adducted, isomeric oligonucleotides formed were chromatographically resolved and structural identification was performed without any prior deoxyribonucleic acid cleavage or hydrolysis. The knowledge of the site specificity of a carcinogen, especially at purported mutational hot spots, is of paramount importance (1) in establishing the identity of biomarkers for an early risk assessment of the formed DNA adducts, (2) developing repair mechanisms for the formed carcinogen adducted DNA, and (3) understanding the nature of the covalent bond formed and mapping the frequency of the adduction process.
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18
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Jahangir T, Safhi MM, Sultana S, Ahmad S. Pluchea lanceolata protects against Benzo(a) pyrene induced renal toxicity and loss of DNA integrity. Interdiscip Toxicol 2013; 6:47-54. [PMID: 24170979 PMCID: PMC3795321 DOI: 10.2478/intox-2013-0009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2012] [Revised: 01/08/2013] [Accepted: 01/17/2013] [Indexed: 11/20/2022] Open
Abstract
Evidence from epidemiological, experimental and clinical trial data indicates that a plant based diet can reduce the risk of chronic diseases and reduces toxic effects. In the present study, we report the antioxidant and anticlastogenic activity of Pluchea lanceolata (PL), an important medicinal plant, in both in vitro and in vivo model. Benzo(a)pyrene (B(a)P) administration leads to depletion of renal glutathione and its metabolizing enzymes. Pretreatment with PL (100 and 200 mg /kg b.wt) restored renal glutathione content and its dependent enzymes significantly (p<0.001) with simultaneous increase in catalase(CAT), quinone reductase(QR) in mouse kidney. Prophylactic administration of PL prior to B (a) P administration significantly decreased the malondialdehyde(MDA), H2O2 and xanthineoxidase (XO) levels at a significance of p<0.001, at both the doses. PL extract pretreated groups showed marked inhibition in B(a)P induced micronuclei formation in mouse bone marrow cells with simultaneous restoration of DNA integrity, viz. alkaline unwinding assay and DNA damage shown by gel-electrophoresis. HPTLC confirms the presence of quercetin in plant extract which could be responsible for PL protecting efficacy. In conclusion, the present findings strongly support the antioxidant efficacy of PL, possibly by modulation of antioxidant armory.
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Affiliation(s)
- Tamanna Jahangir
- Department of Pharmacology, College of Pharmacy, Jazan University, Saudi Arabia
| | - Mohammed M. Safhi
- Department of Pharmacology, College of Pharmacy, Jazan University, Saudi Arabia
| | - Sarwat Sultana
- Department of Medical Elementology and Toxicology, Hamdard University,India
| | - Sayeed Ahmad
- Department of Pharmacognosy, Hamdard University, India
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19
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Szombati Z, Baerns S, Marx A, Meier C. Synthesis of C8-arylamine-modified 2'-deoxyadenosine phosphoramidites and their site-specific incorporation into oligonucleotides. Chembiochem 2012; 13:700-12. [PMID: 22378348 DOI: 10.1002/cbic.201100573] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2011] [Indexed: 01/24/2023]
Abstract
Adducts of C8-(N-acetyl)-arylamines and 2'-deoxyadenosine were synthesised by palladium-catalysed C--N cross-coupling chemistry. These 2'-dA adducts were converted into the corresponding 3'-phosphoramidites and site-specifically incorporated into DNA oligonucleotides, which were characterised by mass spectrometry, UV thermal-stability assays and circular dichroism. These modified oligonucleotides were also used in EcoRI restriction assays and in primer-extension studies with three different DNA polymerases. The incorporation of the 2'-dA lesion close to the EcoRI restriction site dramatically reduced the susceptibility of the DNA strand to cleavage; this indicates a significant local distortion of the DNA double helix. The incorporation of the acetylated C8-2'-dA-phosphoramidites into 20-mer oligonucleotides failed, however, because the N-acetyl group was lost during the deprotection process. Instead the corresponding C8-NH-2'-dA-modified oligonucleotides were obtained. The effect of the C8-NH-arylamine-dA lesion on the replication by DNA polymerases was clearly dependent both on the polymerase used and on the arylamine-dA damage.
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Affiliation(s)
- Zita Szombati
- Organic Chemistry, Department of Chemistry, University of Hamburg, Martin-Luther-King-Platz 6, 20146 Hamburg, Germany
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20
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Dueker SR, Vuong LT, Lohstroh PN, Giacomo JA, Vogel JS. Quantifying exploratory low dose compounds in humans with AMS. Adv Drug Deliv Rev 2011; 63:518-31. [PMID: 21047543 PMCID: PMC3062634 DOI: 10.1016/j.addr.2010.10.009] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2010] [Revised: 10/08/2010] [Accepted: 10/18/2010] [Indexed: 11/20/2022]
Abstract
Accelerator Mass Spectrometry is an established technology whose essentiality extends beyond simply a better detector for radiolabeled molecules. Attomole sensitivity reduces radioisotope exposures in clinical subjects to the point that no population need be excluded from clinical study. Insights in human physiochemistry are enabled by the quantitative recovery of simplified AMS processes that provide biological concentrations of all labeled metabolites and total compound related material at non-saturating levels. In this paper, we review some of the exploratory applications of AMS (14)C in toxicological, nutritional, and pharmacological research. This body of research addresses the human physiochemistry of important compounds in their own right, but also serves as examples of the analytical methods and clinical practices that are available for studying low dose physiochemistry of candidate therapeutic compounds, helping to broaden the knowledge base of AMS application in pharmaceutical research.
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21
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Yuxia W, Lijun Y, Qin L, Jia C, Jianwei X. A sensitive high performance liquid chromatography–positive electrospray tandem mass spectrometry method for N7-[2-[(2-hydroxyethyl)thio]-ethyl]guanine determination. J Chromatogr B Analyt Technol Biomed Life Sci 2011; 879:1707-12. [DOI: 10.1016/j.jchromb.2011.03.040] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2010] [Revised: 03/18/2011] [Accepted: 03/21/2011] [Indexed: 10/18/2022]
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22
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Accelerator mass spectrometry-enabled studies: current status and future prospects. Bioanalysis 2011; 2:519-41. [PMID: 20440378 DOI: 10.4155/bio.09.188] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Accelerator mass spectrometry is a detection platform with exceptional sensitivity compared with other bioanalytical platforms. Accelerator mass spectrometry (AMS) is widely used in archeology for radiocarbon dating applications. Early exploration of the biological and pharmaceutical applications of AMS began in the early 1990s. AMS has since demonstrated unique problem-solving ability in nutrition science, toxicology and pharmacology. AMS has also enabled the development of new applications, such as Phase 0 microdosing. Recent development of AMS-enabled applications has transformed this novelty research instrument to a valuable tool within the pharmaceutical industry. Although there is now greater awareness of AMS technology, recognition and appreciation of the range of AMS-enabled applications is still lacking, including study-design strategies. This review aims to provide further insight into the wide range of AMS-enabled applications. Examples of studies conducted over the past two decades will be presented, as well as prospects for the future of AMS.
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23
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Parmar J, Sharma P, Verma P, Sharma P, Goyal PK. Elimination of Deleterious Effects of DMBA-Induced Skin Carcinogenesis in Mice by Syzygium cumini Seed Extract. Integr Cancer Ther 2010; 10:289-97. [DOI: 10.1177/1534735410385112] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The inhibition of tumor incidence by hydro-alcoholic extract of S.cumini seed was evaluated in mice on two stage process of skin carcinogenesis induced by single application of 7, 12-dimethyl benz(a)anthracene (100 µg/100µl of acetone), and 2 weeks later promoted by repeated application of croton oil (1% acetone/thrice in a week) till the end of the experiment (i.e. 16 weeks). Oral administration of extract at a dose of 250mg/kg b.wt./day at the peri-initiational stage (i.e. 7 days before and 7 days after DMBA application), promotional stage (i.e. from the time of croton oil application) and at both the stages (i.e. 7 days prior to DMBA application & continued till the end of experiment) to the mice, recorded a significant reduction in tumor incidence to 37.5, 50 & 25% respectively in comparison to the carcinogen treated control, where tumor incidence was found as 100%. Tumor yield and Tumor burden were also significantly reduced by SCE. Similarly, the cumulative number of papillomas after 16 weeks was 68 in the control group, which was reduced to 15, 21 & 8 in the animals treated with the SCE continuously at peri-, post- and peri- & post- initiation stage respectively. A significant impairment was noticed in the levels of reduced glutathione, superoxide dismutase, catalase & protein and enhancement in LPO in liver and skin of carcinogen treated control mice as compared with vehicle treated mice. All such parameters were returned to near normal value by administration of SCE to DMBA treated mice. These results suggest a possible chemopreventive property of S.cumini against DMBA induced skin carcinogenesis in mice.
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Affiliation(s)
- Jyoti Parmar
- University of Rajasthan, Jaipur, Rajasthan, India
| | | | - Preeti Verma
- University of Rajasthan, Jaipur, Rajasthan, India
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24
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Böge N, Jacobsen MI, Szombati Z, Baerns S, Di Pasquale F, Marx A, Meier C. Synthesis of DNA strands site-specifically damaged by c8-arylamine purine adducts and effects on various DNA polymerases. Chemistry 2009; 14:11194-208. [PMID: 18988239 DOI: 10.1002/chem.200800979] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
C8-Arylamine-dG and C8-arylamine-dA adducts have been prepared using palladium cross-coupling chemistry. These adducts were subsequently converted into the corresponding 5'-O-DMTr-C8-arylamine-3'-O-phosphoramidites and then used for the automated synthesis of different site-specifically modified oligonucleotides. These "damaged" oligonucleotides have been characterized by ESI-MS, UV thermal stability assays, and circular dichroism, and they have been used in EcoRI assays as well as in primer extension studies using various DNA polymerases.
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Affiliation(s)
- Nicolas Böge
- Organic Chemistry, Department of Chemistry, Faculty of Science, University of Hamburg, Martin-Luther-King-Platz 6, 20146 Hamburg, Germany
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25
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Nagy E, Cornelius MG, Moller L. Accelerated 32P-HPLC for bulky DNA adducts. Mutagenesis 2008; 24:183-9. [DOI: 10.1093/mutage/gen070] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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26
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Jahangir T, Sultana S. Benzo(a)pyrene-induced genotoxicity: Attenuation by farnesol in a mouse model. J Enzyme Inhib Med Chem 2008; 23:888-94. [DOI: 10.1080/14756360701448768] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Affiliation(s)
| | - Sarwat Sultana
- Department of Medical Elementology and Toxicology, Jamia Hamdard (Hamdard University), Hamdard NagarNew Delhi, 110062, India
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27
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Böge N, Szombati Z, Meier C. Synthesis of DNA-oligonucleotides damaged by arylamine-modified 2'-deoxyguanosine. NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 2008; 26:705-8. [PMID: 18066884 DOI: 10.1080/15257770701490738] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
C8-Arylamine-dG adducts bearing a labile N-formamidine group at the exocyclic amino function were converted into their corresponding 5'-O-DMTr-3'-O-phosphoramidite-C8-arylamine-dG derivatives. These compounds were used for the automated synthesis of site-specifically modified oligonucleotides. These oligonucleotides were characterized by ESI-MS and enzymatic digestion and studied for their CD properties and Tm values.
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Affiliation(s)
- N Böge
- Department of Chemistry, Organic Chemistry, Faculty of Science, University of Hamburg, Hamburg, Germany.
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28
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Yuan Y, Wang HF, Sun HF, Du HF, Xu LH, Liu YF, Ding XF, Fu DP, Liu KX. Adduction of DNA with MTBE and TBA in mice studied by accelerator mass spectrometry. ENVIRONMENTAL TOXICOLOGY 2007; 22:630-635. [PMID: 18000852 DOI: 10.1002/tox.20295] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Methyl tert-butyl ether (MTBE) is a currently worldwide used octane enhancer substituting for lead alkyls and gasoline oxygenate. Our previous study using doubly (14)C-labeled MTBE [(CH(3))(3) (14)CO(14)CH(3)] has shown that MTBE binds DNA to form DNA adducts at low dose levels in mice. To elucidate the mechanism of the binding reaction, in this study, the DNA adducts with singly (14)C-labeled MTBE, which was synthesized from (14)C-methanol and tert-butyl alcohol (TBA), or (14)C-labeled TBA in mice have been measured by ultra sensitive accelerator mass spectrometry. The results show that the methyl group of MTBE and tert-butyl alcohol definitely form adducts with DNA in mouse liver, lung, and kidney. The methyl group of MTBE is the predominant binding part in liver, while the methyl group and the tert-butyl group give comparable contributions to the adduct formation in lung and kidney.
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Affiliation(s)
- Y Yuan
- Beijing National Laboratory for Molecular Sciences, Department of Chemical Biology, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
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29
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Oliveira PA, Colaço A, Chaves R, Guedes-Pinto H, De-La-Cruz P. LF, Lopes C. Chemical carcinogenesis. AN ACAD BRAS CIENC 2007; 79:593-616. [DOI: 10.1590/s0001-37652007000400004] [Citation(s) in RCA: 100] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2005] [Accepted: 05/10/2007] [Indexed: 12/18/2022] Open
Abstract
The use of chemical compounds benefits society in a number of ways. Pesticides, for instance, enable foodstuffs to be produced in sufficient quantities to satisfy the needs of millions of people, a condition that has led to an increase in levels of life expectancy. Yet, at times, these benefits are offset by certain disadvantages, notably the toxic side effects of the chemical compounds used. Exposure to these compounds can have varying effects, ranging from instant death to a gradual process of chemical carcinogenesis. There are three stages involved in chemical carcinogenesis. These are defined as initiation, promotion and progression. Each of these stages is characterised by morphological and biochemical modifications and result from genetic and/or epigenetic alterations. These genetic modifications include: mutations in genes that control cell proliferation, cell death and DNA repair - i.e. mutations in proto-oncogenes and tumour suppressing genes. The epigenetic factors, also considered as being non-genetic in character, can also contribute to carcinogenesis via epigenetic mechanisms which silence gene expression. The control of responses to carcinogenesis through the application of several chemical, biochemical and biological techniques facilitates the identification of those basic mechanisms involved in neoplasic development. Experimental assays with laboratory animals, epidemiological studies and quick tests enable the identification of carcinogenic compounds, the dissection of many aspects of carcinogenesis, and the establishment of effective strategies to prevent the cancer which results from exposure to chemicals.
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Affiliation(s)
| | - Aura Colaço
- University of Trás-os-Montes and Alto Douro, Portugal
| | - Raquel Chaves
- University of Trás-os-Montes and Alto Douro (UTAD), Portugal
| | | | | | - Carlos Lopes
- Portuguese Institute of Oncology, Portugal; University of Porto, Portugal
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30
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Jamin EL, Arquier D, Canlet C, Rathahao E, Tulliez J, Debrauwer L. New insights in the formation of deoxynucleoside adducts with the heterocyclic aromatic amines PhIP and IQ by means of ion trap MSn and accurate mass measurement of fragment ions. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2007; 18:2107-2118. [PMID: 17936011 DOI: 10.1016/j.jasms.2007.09.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2007] [Revised: 09/14/2007] [Accepted: 09/14/2007] [Indexed: 05/25/2023]
Abstract
The formation of adducts by reaction of active metabolites of two heterocyclic aromatic amines (NHOH-PhIP and NHOH-IQ) at nucleophilic sites of deoxynucleosides has been studied by LC-MS(n) analyses of the obtained reaction mixtures. Sequential MS(3) experiments were carried out on an ion trap mass spectrometer to gain extensive structural information on each adduct detected in the first MS step. Attribution of ions was supported by accurate mass measurements performed on an Orbitrap mass analyzer. Particular attention was given to ions diagnostic of the linking between the heterocyclic aromatic amine (HAA) and the deoxynucleoside. By this way, the structures of five adducts have been characterized in this study, among which two are new compounds: dG-N7-IQ and dA-N(6)-IQ. No depurinating adduct was found in the reactions investigated therein. As expected, the C8 and N(2) atoms of dG were found as the most reactive sites of deoxynucleosides, resulting in the formation of two different adducts with IQ and one adduct with PhIP. An unusual non-depurinating dG-N7-IQ adduct has been characterized and a mechanism is proposed for its formation on the basis of the reactivity of arylamines. A dA-N(6)-IQ adduct has been identified for the first time in this work, showing that HAAs can generate DNA adducts with bases other than dG.
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Affiliation(s)
- Emilien L Jamin
- UMR 1089 Xenobiotiques INRA-ENVT, 180 Chemin de Tournefeuille, Toulouse, France
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Fan YH, Hu Z, Li C, Wang LE, Guo Z, Qiao Y, Zhang L, Zhang W, Mao L, Wei Q. In vitro expression levels of cell-cycle checkpoint proteins are associated with cellular DNA repair capacity in peripheral blood lymphocytes: a multivariate analysis. J Proteome Res 2007; 6:1560-7. [PMID: 17362036 PMCID: PMC2579792 DOI: 10.1021/pr060655k] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
DNA repair should occur after cells sense DNA damage signals and undergo cell-cycle arrest to provide sufficient time for DNA repair, and suboptimal DNA repair capacity (DRC) in peripheral lymphocytes has been suggested as a cancer susceptibility marker. Numerous studies showed a functional link between DNA damage sensing, cell-cycle checkpoint, and DNA repair. We hypothesized that in vitro cell-cycle checkpoint-related protein expression levels in stimulated lymphocytes predict DRC levels. To test this hypothesis, we performed the host-cell reactivation assay for DRC by transfecting stimulated peripheral blood lymphocytes from 120 normal donors with transient expression plasmids damaged by benzo[a]pyrene diol epoxide (BPDE). The same cells were assessed for protein expression induction of eight cell-cycle checkpoint-related genes using the reverse-phase protein lysate microarray assay. In multivariate linear regression analysis adjusting for age, sex, blastogenic rate, and sample storage duration, the association between DRC and expression levels of cell-cycle checkpoint-related proteins induced by BPDE-adducts was statistically significant for p27, CCND1, ATM, and MDM2 (P = 0.00, 0.03, 0.03, and 0.03, respectively), borderline for p73 and p21 (P = 0.07 and 0.09, respectively), but not for p53 and p16 (P = 0.13 and 0.18, respectively). Because the relative expression levels of all these eight proteins were highly correlated, we further performed the principal component analysis and identified ATM as the most important predictor of DRC, followed by MDM2 and p27. Our results provide population-based in vitro evidence demonstrating that cell-cycle checkpoint-related proteins play essential roles in regulating DNA repair, at least in unaffected human peripheral blood lymphocytes. Further studies are warranted to investigate the role of interindividual variation in the expression levels of these proteins in cancer susceptibility.
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Affiliation(s)
- You-Hong Fan
- Department of Thoracic and Head and Neck Medical Oncology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030
| | - Zhibin Hu
- Department of Epidemiology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030
| | - Chunying Li
- Department of Epidemiology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030
| | - Li-E Wang
- Department of Epidemiology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030
| | - Zhaozheng Guo
- Department of Epidemiology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030
| | - Yawei Qiao
- Department of Epidemiology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030
| | - Li Zhang
- Department of Biostatistics, The University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030
| | - Wei Zhang
- Department of Pathology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030
| | - Li Mao
- Department of Thoracic and Head and Neck Medical Oncology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030
- The University of Graduate School of Biomedical Sciences, Houston, Texas 77030
| | - Qingyi Wei
- Department of Epidemiology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030
- The University of Graduate School of Biomedical Sciences, Houston, Texas 77030
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Beumer JH, Garner RC, Cohen MB, Galbraith S, Duncan GF, Griffin T, Beijnen JH, Schellens JHM. Human mass balance study of the novel anticancer agent ixabepilone using accelerator mass spectrometry. Invest New Drugs 2007; 25:327-34. [PMID: 17347871 PMCID: PMC1915607 DOI: 10.1007/s10637-007-9041-z] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2007] [Accepted: 02/08/2007] [Indexed: 01/10/2023]
Abstract
Ixabepilone (BMS-247550) is a semi-synthetic, microtubule stabilizing epothilone B analogue which is more potent than taxanes and has displayed activity in taxane-resistant patients. The human plasma pharmacokinetics of ixabepilone have been described. However, the excretory pathways and contribution of metabolism to ixabepilone elimination have not been determined. To investigate the elimination pathways of ixabepilone we initiated a mass balance study in cancer patients. Due to autoradiolysis, ixabepilone proved to be very unstable when labeled with conventional [14C]-levels (100 μCi in a typical human radio-tracer study). This necessitated the use of much lower levels of [14C]-labeling and an ultra-sensitive detection method, Accelerator Mass Spectrometry (AMS). Eight patients with advanced cancer (3 males, 5 females; median age 54.5 y; performance status 0–2) received an intravenous dose of 70 mg, 80 nCi of [14C]ixabepilone over 3 h. Plasma, urine and faeces were collected up to 7 days after administration and total radioactivity (TRA) was determined using AMS. Ixabepilone in plasma and urine was quantitated using a validated LC-MS/MS method. Mean recovery of ixabepilone-derived radioactivity was 77.3% of dose. Fecal excretion was 52.2% and urinary excretion was 25.1%. Only a minor part of TRA is accounted for by unchanged ixabepilone in both plasma and urine, which indicates that metabolism is a major elimination mechanism for this drug. Future studies should focus on structural elucidation of ixabepilone metabolites and characterization of their activities.
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Affiliation(s)
- J H Beumer
- Department of Pharmacy & Pharmacology, Slotervaart Hospital/The Netherlands Cancer Institute, Amsterdam, The Netherlands.
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Böge N, Gräsl S, Meier C. Synthesis and properties of oligonucleotides containing C8-deoxyguanosine arylamine adducts of borderline carcinogens. J Org Chem 2007; 71:9728-38. [PMID: 17168591 DOI: 10.1021/jo061803t] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
C8-Arylamine-dG adducts of borderline carcinogens and the bladder and breast carcinogen 4-aminobiphenyl were prepared using cross-coupling chemistry. These adducts were converted into the corresponding C8-arylamine-5'-O-DMTr-2'-deoxyguanosine phosphoramidites and then used as building blocks for automated synthesis of site-specifically modified oligonucleotides. The oligonucleotides were characterized by UV melting temperature analysis, enzymatic digestion, and circular dichroism.
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Affiliation(s)
- Nicolas Böge
- Institute of Organic Chemistry, Department of Chemistry, Faculty of Mathematics, Informatics and Natural Sciences, University of Hamburg, Martin-Luther-King-Platz 6, D-20149 Hamburg, Germany
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Meneni S, Liang F, Cho BP. Examination of the long-range effects of aminofluorene-induced conformational heterogeneity and its relevance to the mechanism of translesional DNA synthesis. J Mol Biol 2006; 366:1387-400. [PMID: 17217958 PMCID: PMC1850230 DOI: 10.1016/j.jmb.2006.12.023] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2006] [Revised: 12/06/2006] [Accepted: 12/12/2006] [Indexed: 10/23/2022]
Abstract
Adduct-induced conformational heterogeneity complicates the understanding of how DNA adducts exert mutation. A case in point is the N-deacetylated AF lesion [N-(2'-deoxyguanosin-8-yl)-2-aminofluorene], the major adduct derived from the strong liver carcinogen N-acetyl-2-aminofluorene. Three conformational families have been previously characterized and are dependent on the positioning of the aminofluorene rings: B is in the "B-DNA" major groove, S is "stacked" into the helix with base-displacement, and W is "wedged" into the minor groove. Here, we conducted (19)F NMR, CD, T(m), and modeling experiments at various primer positions with respect to a template modified by a fluorine tagged AF-adduct (FAF). In the first set, the FAF-G was paired with C and in the second set it was paired with A. The FAF-G:C oligonucleotides were found to preferentially adopt the B or S-conformers while the FAF-G:A mismatch ones preferred the B and W-conformers. The conformational preferences of both series were dependent on temperature and complementary strand length; the largest differences in conformation were displayed at lower temperatures. The CD and T(m) results are in general agreement with the NMR data. Molecular modeling indicated that the aminofluorene moiety in the minor groove of the W-conformer would impose a steric clash with the tight-packing amino acid residues on the DNA binding area of the Bacillus fragment (BF), a replicative DNA polymerase. In the case of the B-type conformer, the carcinogenic moiety resides in the solvent-exposed major groove throughout the replication/translocation process. The present dynamic NMR results, combined with previous primer extension kinetic data by Miller & Grollman, support a model in which adduct-induced conformational heterogeneities at positions remote from the replication fork affect polymerase function through a long-range DNA-protein interaction.
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Affiliation(s)
| | | | - Bongsup P. Cho
- *Address correspondence to: Bongsup P. Cho, Dept. of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, 41 Lower College Road, Kingston, Rhode Island 02881, Tel. 401-874-5024; Fax. 401-874-5766;
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Batra VK, Shock DD, Prasad R, Beard WA, Hou EW, Pedersen LC, Sayer JM, Yagi H, Kumar S, Jerina DM, Wilson SH. Structure of DNA polymerase beta with a benzo[c]phenanthrene diol epoxide-adducted template exhibits mutagenic features. Proc Natl Acad Sci U S A 2006; 103:17231-6. [PMID: 17079493 PMCID: PMC1630674 DOI: 10.1073/pnas.0605069103] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
We have determined the crystal structure of the human base excision repair enzyme DNA polymerase beta (Pol beta) in complex with a 1-nt gapped DNA substrate containing a template N2-guanine adduct of the tumorigenic (-)-benzo[c]phenanthrene 4R,3S-diol 2S,1R-epoxide in the gap. Nucleotide insertion opposite this adduct favors incorrect purine nucleotides over the correct dCMP and hence can be mutagenic. The structure reveals that the phenanthrene ring system is stacked with the base pair immediately 3' to the modified guanine, thereby occluding the normal binding site for the correct incoming nucleoside triphosphate. The modified guanine base is displaced downstream and prevents the polymerase from achieving the catalytically competent closed conformation. The incoming nucleotide binding pocket is distorted, and the adducted deoxyguanosine is in a syn conformation, exposing its Hoogsteen edge, which can hydrogen-bond with dATP or dGTP. In a reconstituted base excision repair system, repair of a deaminated cytosine (i.e., uracil) opposite the adducted guanine was dramatically decreased at the Pol beta insertion step, but not blocked. The efficiency of gap-filling dCMP insertion opposite the adduct was diminished by >6 orders of magnitude compared with an unadducted templating guanine. In contrast, significant misinsertion of purine nucleotides (but not dTMP) opposite the adducted guanine was observed. Pol beta also misinserts a purine nucleotide opposite the adduct with ungapped DNA and exhibits limited bypass DNA synthesis. These results indicate that Pol beta-dependent base excision repair of uracil opposite, or replication through, this bulky DNA adduct can be mutagenic.
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Affiliation(s)
- Vinod K. Batra
- Laboratory of Structural Biology, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, NC 27709
| | - David D. Shock
- Laboratory of Structural Biology, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, NC 27709
| | - Rajendra Prasad
- Laboratory of Structural Biology, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, NC 27709
| | - William A. Beard
- Laboratory of Structural Biology, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, NC 27709
| | - Esther W. Hou
- Laboratory of Structural Biology, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, NC 27709
| | - Lars C. Pedersen
- Laboratory of Structural Biology, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, NC 27709
| | - Jane M. Sayer
- Laboratory of Bioorganic Chemistry, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Department of Health and Human Services, Bethesda MD 20892; and
| | - Haruhiko Yagi
- Laboratory of Bioorganic Chemistry, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Department of Health and Human Services, Bethesda MD 20892; and
| | - Subodh Kumar
- Environmental Toxicology and Chemistry Laboratory, Great Lakes Center, Buffalo State College, Buffalo, NY 14222
| | - Donald M. Jerina
- Laboratory of Bioorganic Chemistry, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Department of Health and Human Services, Bethesda MD 20892; and
| | - Samuel H. Wilson
- Laboratory of Structural Biology, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, NC 27709
- To whom correspondence should be addressed. E-mail:
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Skupinska K, Misiewicz I, Kasprzycka-Guttman T. A comparison of the concentration-effect relationships of PAHs on CYP1A induction in HepG2 and Mcf7 cells. Arch Toxicol 2006; 81:183-200. [PMID: 16953391 DOI: 10.1007/s00204-006-0140-y] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2006] [Accepted: 07/31/2006] [Indexed: 12/08/2022]
Abstract
Polycyclic aromatic hydrocarbons (PAHs) are environmental pollutants. Some compounds belonging to this group are considered carcinogenic to people. In order to yield carcinogenic properties, these compounds must be metabolically transformed by enzymes of cytochrome P450 family to oxy-derivatives. In this study, the ability of the following six PAHs: anthracene (Ant), benz(a)anthracene (BA), naphthacene (Nap), benzo(a)pyrene (BaP), dibenz(a,c)anthracene (DB(a,c)A) and dibenz(a,h)anthracene (DB(a,h)A) to induce enzymes of cytochrome P450 (CYP450), in particular CYP1A1 and CYP1A2 in Mcf7 and HepG2 cells was studied. The induction of CYP1A enzymes was assessed at the level of enzymatic protein and enzymatic activity. The change in CYP1A1 and CYP1A2 protein level was assessed by means of confocal microscopy. The ethoxyresorufin-O-deethylase (EROD) and methoxyresorufin-O-deethylase (MROD) assays were applied to determine the CYP1A1 and CYP1A2 activity. The Induction Equivalency Factors (IEFs) were also determined. According to EROD and MROD assay and calculated IEFs the following order of the inducing potency was determined in HepG2 cells: DB(a,h)A > BaP > DB(a,c)A approximately BA > Nap > Ant, and in Mcf7 cells: DB(a,h)A > DB(a,c)A > BaP > Nap > BA > Ant. The assessment of the protein levels revealed that DB(a,h)A was also the strongest inducer of protein level, however the correlation between enzymatic activity and protein level induction by other PAHs was not always evident. The EROD and MROD activities were higher in Mcf7 than in HepG2 cells, however the CYP1A2 protein level was shown to be higher in HepG2 cells. The results obtained indicate possible catalytic enzymatic activity alterations induced by PAHs.
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Affiliation(s)
- K Skupinska
- Confocal Microscopy Laboratory, National Institute of Public Health, Chelmska 30/34, 00-725, Warsaw, Poland
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Zhang L, Rechkoblit O, Wang L, Patel DJ, Shapiro R, Broyde S. Mutagenic nucleotide incorporation and hindered translocation by a food carcinogen C8-dG adduct in Sulfolobus solfataricus P2 DNA polymerase IV (Dpo4): modeling and dynamics studies. Nucleic Acids Res 2006; 34:3326-37. [PMID: 16820532 PMCID: PMC1500869 DOI: 10.1093/nar/gkl425] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
Abstract
Bulky carcinogen-DNA adducts commonly cause replicative polymerases to stall, leading to a switch to bypass polymerases. We have investigated nucleotide incorporation opposite the major adduct of 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) in the DinB family polymerase, Dpo4, using molecular modeling and molecular dynamics (MD) simulations. PhIP, the most prevalent heterocyclic aromatic amine formed by cooking of proteinaceous food, is mutagenic in mammalian cells and is implicated in mammary and colon tumors. Our results show that the dG-C8-PhIP adduct can be accommodated in the spacious major groove Dpo4 open pocket, with Dpo4 capable of incorporating dCTP, dTTP or dATP opposite the adduct reasonably well. However, the PhIP ring system on the minor groove side would seriously disturb the active site, regardless of the presence and identity of dNTP. Furthermore, the simulations indicate that dATP and dTTP are better incorporated in the damaged system than in their respective mismatched but unmodified controls, suggesting that the PhIP adduct enhances incorporation of these mismatches. Finally, bulky C8-dG adducts, situated in the major groove, are likely to impede translocation in this polymerase (Rechkoblit et al. (2006), PLoS Biol., 4, e11). However, N2-dG adducts, which can reside on the minor groove side, appear to cause less hindrance when in this position.
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Affiliation(s)
| | - Olga Rechkoblit
- Structural Biology Program, Memorial Sloan-Kettering Cancer CenterNew York, NY, USA
| | - Lihua Wang
- Department of Biology, New York UniversityNew York, NY, USA
| | - Dinshaw J. Patel
- Structural Biology Program, Memorial Sloan-Kettering Cancer CenterNew York, NY, USA
| | | | - Suse Broyde
- Department of Biology, New York UniversityNew York, NY, USA
- To whom correspondence should be addressed. Tel: +1 212 998 8231; Fax: +1 212 995 4015;
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Tamura T, Mitsumori K, Totsuka Y, Wakabayashi K, Kido R, Kasai H, Nasu M, Hirose M. Absence of in vivo genotoxic potential and tumor initiation activity of kojic acid in the rat thyroid. Toxicology 2006; 222:213-24. [PMID: 16603304 DOI: 10.1016/j.tox.2006.02.023] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2005] [Revised: 02/18/2006] [Accepted: 02/20/2006] [Indexed: 10/24/2022]
Abstract
To clarify the in vivo genotoxic potential of kojic acid (KA), formation of DNA adducts and 8-hydroxy-deoxyguanosine (8-OHdG) in the thyroids of male rats subjected to dietary administration of 2% KA for 2 weeks were assessed by 32P-postlabeling analysis and with a high-performance liquid chromatography system coupled to an electrochemical detector (ECD), respectively. In addition, to investigate possible tumor initiation activity, male F344 rats were given diet containing 0, 0.02, 0.2 or 2% kojic acid for 8 weeks followed by administration of 0.1% sulfadimethoxine (SDM), a thyroid tumor promoter, in the drinking water for 23 weeks with a subsequent 13-week recovery period (two-stage thyroid tumorigenesis model). Rats given four times by s.c. injection of N-bis(2-hydroxypropyl)nitrosamine (DHPN; 700 mg/kg bw) during the initiation period followed by administration of 0.1% SDM and rats given diet containing 2% KA for the initial 8 weeks or for the entire 31 weeks of the experiment, or basal diet alone were provided as controls. DNA adducts were not formed, and the 8-OHdG level was not increased in the thyroids of rats given 2% KA for 2 weeks. In the two-stage thyroid tumorigenesis model, neither adenomas nor carcinomas were induced in the groups given 0, 0.02, 0.2 or 2% KA followed by 0.1% SDM administration, and incidences and multiplicities of focal follicular cell hyperplasias did not demonstrate any significant intergroup differences at the end of administration and recovery periods. In contrast, incidences and multiplicities of focal follicular cell hyperplasias, adenomas and carcinomas were all significantly increased in the DHPN + 0.1% SDM group. Although the incidences and multiplicities of focal follicular cell hyperplasias in the group given 2% KA for 31 weeks were greater than those in the 2% KA + 0.1% SDM group and an adenoma was observed in a rat at the end of the recovery period, no development of carcinomas was evident at either time point. No thyroid proliferative lesions were induced in the group given 2% KA for the initial 8 weeks only. The results of the present studies indicate that KA has neither in vivo genotoxic potential nor tumor initiation activity in the thyroid, and strongly suggest that the earlier observed thyroid tumorigenic activity of KA is attributable to a non-genotoxic mechanism.
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Affiliation(s)
- Toru Tamura
- Division of Pathology, National Institute of Health Sciences, 1-18-1, Kamiyoga, Setagaya-ku, Tokyo 158-8501, Japan
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Cherng SH, Hsu SL, Yang JL, Yu CTR, Lee H. Suppressive effect of 1-nitropyrene on benzo[a]pyrene-induced CYP1A1 protein expression in HepG2 cells. Toxicol Lett 2005; 161:236-43. [PMID: 16280210 DOI: 10.1016/j.toxlet.2005.10.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2005] [Revised: 10/06/2005] [Accepted: 10/06/2005] [Indexed: 11/22/2022]
Abstract
The genotoxicity of polycyclic aromatic hydrocarbons (PAHs) and nitrated PAHs may be influenced by the interaction of the compounds. In this study, our data showed that benzo[a]pyrene (BaP)-DNA adduct levels were decreased in a dose-dependent manner when the human hepatoma cell line HepG2 simultaneously treated with BaP and 1-nitropyrene (1-NP). To further investigate the molecular mechanism by which 1-NP interferes with the covalent binding of BaP to DNA, we conducted experiments to analyze the mRNA level and protein stability of cytochrome P450 1A1 (CYP1A1), which is engaged in the activation of BaP, leading to the generation of BaP-DNA adducts. Northern blot analysis presented that 1-NP attenuated BaP-induced CYP1A1 mRNA expression by 30.4-39.6% (p < 0.05). Western blot analysis revealed that the co-treatment with BaP and 1-NP resulted in a significant inhibition of BaP-induced CYP1A1 protein expression (70.7-88.2%, p < 0.05). However, the decrease in CYP1A1 protein levels was significantly larger than that in CYP1A1 mRNA levels. To confirm the effect of 1-NP on the CYP1A1 protein expression, in vitro proteolysis of CYP1A1 protein was evaluated. The results demonstrated that the addition of 1-NP enhanced CYP1A1 protein degradation and the proteolysis of CYP1A1 protein was inhibited by the addition of an antioxidant, dithiothreitol. In addition, the relative levels of reactive oxygen species (ROS) were elevated in HepG2 cells co-treated with BaP and 1-NP, indicating that the decrease of CYP1A1 protein level was probably attributed to the production of ROS generated by binary mixture. Taken together, these findings suggested that the transcriptional suppression and posttranslational mechanism may be involved in loss of CYP1A1 protein, causing the decrease of BaP-DNA adduct levels in the presence of binary mixtures of 1-NP and BaP.
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Affiliation(s)
- Shur-Hueih Cherng
- Department of Biotechnology, Hung Kuang University, Taichung, Taiwan, ROC
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Willems AV, Deforce DL, Van Peteghem CH, Van Bocxlaer JF. Analysis of nucleic acid constituents by on-line capillary electrophoresis-mass spectrometry. Electrophoresis 2005; 26:1221-53. [PMID: 15759298 DOI: 10.1002/elps.200410278] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
This review is focused on the capillary electrophoresis-mass spectrometric (CE-MS) analysis of nucleic acid constituents in the broadest sense, going from nucleotides and adducted nucleotides over nucleoside analogues to oligonucleotides. These nucleic acid constituents play an important role in a variety of biochemical processes. Hence, their isolation, identification, and quantification will undoubtedly help reveal the process of life and disease mechanisms, such as carcinogenesis, and can also be useful for antitumor and antiviral drug research to provide valuable information about mechanism of action, pharmacokinetics, pharmacodynamics, toxicity, therapeutic drug level monitoring, and quality control related to this substance class. Fundamental investigations into their structure, the search for modifications, the occurrence and biochemical impact of structural variation amongst others, are therefore of great value. In view of the related bioanalytical procedures, the coupling of CE to MS has emerged as a powerful tool for the analysis of the complex mixtures of nucleic acid constituents: CE confers rapid analysis and efficient resolution, while MS provides high selectivity and sensitivity with structural characterization of minute amounts of compound. After an introduction about the biochemical and analytical perspectives on the nucleic acid constituents, the different modes of CE used in this field of research as well as the relevant CE-MS interfaces and the difficulties associated with quantitative CE-MS are briefly discussed. A large section is finally devoted to field-oriented applications.
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Affiliation(s)
- An V Willems
- Laboratory of Medical Biochemistry & Clinical Analysis, Faculty of Pharmaceutical Sciences, Ghent University, Belgium
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Du HF, Xu LH, Wang HF, Liu YF, Tang XY, Liu KX, Peng SX. Formation of MTBE-DNA adducts in mice measured with accelerator mass spectrometry. ENVIRONMENTAL TOXICOLOGY 2005; 20:397-401. [PMID: 16007660 DOI: 10.1002/tox.20124] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Methyl tert-butyl ether (MTBE) is a gasoline oxygenate and antiknock additive substituting for lead alkyls currently in use worldwide. Previous studies have shown that MTBE at very high doses induces tumors in rodents. The aim of the present study was to examine directly the binding ability of MTBE onto DNA, demonstrating its potential genotoxicity. MTBE-DNA adducts and their decay kinetics in mice have been measured by using doubly 14C-labeled MTBE with an advanced, ultrasensitive technique: accelerator mass spectrometry (AMS). It was found that MTBE definitely formed adducts with DNA in mouse lung, liver, and kidney in a log/log linear dose-response relationship. The distribution sequence of DNA adducts in these tissues is: lung > liver > kidney. The level of MTBE-DNA adducts peaked at 12 h postadministration in the lung and peaked at 6 h postadministration in the liver. Then the adducts declined rapidly until 5 days postadministration and thereafter declined much more slowly. To our knowledge, this is the first report on DNA adduction with MTBE in vivo. The mechanism of the formation of MTBE-DNA adducts also is discussed.
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Affiliation(s)
- H F Du
- Department of Environmental Science and Technology, Fudan University, Shanghai 200433, China
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42
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Nagy E, Zeisig M, Kawamura K, Hisamatsu Y, Sugeta A, Adachi S, Möller L. DNA adduct and tumor formations in rats after intratracheal administration of the urban air pollutant 3-nitrobenzanthrone. Carcinogenesis 2005; 26:1821-8. [PMID: 15917305 DOI: 10.1093/carcin/bgi141] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
3-Nitrobenzanthrone (3-NBA) has been isolated from diesel exhaust and airborne particles and identified as a potent direct-acting mutagen in vitro and genotoxic agent in vivo. In order to evaluate the in vivo toxicity and carcinogenicity of 3-NBA in a situation corresponding to inhalation, a combined short-term and lifetime study with intratracheal (i.t.) instillation in female F344 rats was performed. DNA adduct formation, as a marker for the primary effect and analyzed by 32P-HPLC after single instillation, showed a few major DNA adducts and a rapid increase with a peak after 2 days, followed by a decline. No DNA adducts above the background level were observed after 16 days. The highest DNA adduct formation was observed in lung [approximately 250 DNA adducts/10(8) normal nucleotides (NN)] closely followed by kidney (approximately 200 DNA adducts/10(8) NN), whereas liver contained only 12% (approximately 30 DNA adducts/10(8) NN) of the levels of DNA adducts found in lung. In the tumor study, squamous cell carcinomas were found after 7-9 months in the high-dose group (total dose of 2.5 mg 3-NBA) and after 10-12 months in the low-dose group (total dose of 1.5 mg 3-NBA). The fraction of squamous cell carcinoma out of the total amount of tumors observed at the end of experiment at 18 months, corresponded to 3/16 and 11/16 in the low- and high-dose group, respectively. A single case of adenocarcinoma was also observed in each group. In the control group, no tumors were observed during the entire study of 18 months. In addition, a few cases of squamous metaplasia were also observed in the lung in both dose groups but not in the controls. In conclusion, 3-NBA forms DNA adducts in the lung immediately after i.t. administration but almost all DNA adducts were eliminated after 16 days. Tumor formation in two dose groups was observed in a dose-dependent manner with squamous cell carcinomas as the predominant tumor type at high exposure.
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Affiliation(s)
- Eszter Nagy
- Department for Biosciences at Novum, Karolinska Institutet, SE-141 57 Huddinge, Stockholm, Sweden
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43
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Lenoir V, Yon de Jonage-Canonico MB, Perrin MH, Martin A, Scholler R, Kerdelhué B. Preventive and curative effect of melatonin on mammary carcinogenesis induced by dimethylbenz[a]anthracene in the female Sprague-Dawley rat. Breast Cancer Res 2005; 7:R470-6. [PMID: 15987452 PMCID: PMC1175060 DOI: 10.1186/bcr1031] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2004] [Revised: 03/16/2005] [Accepted: 03/31/2005] [Indexed: 11/25/2022] Open
Abstract
Introduction It has been well documented that the pineal hormone, melatonin, which plays a major role in the control of reproduction in mammals, also plays a role in the incidence and growth of breast and mammary cancer. The curative effect of melatonin on the growth of dimethylbenz [a]anthracene-induced (DMBA-induced) mammary adenocarcinoma (ADK) has been previously well documented in the female Sprague–Dawley rat. However, the preventive effect of melatonin in limiting the frequency of cancer initiation has not been well documented. Methods The aim of this study was to compare the potency of melatonin to limit the frequency of mammary cancer initiation with its potency to inhibit tumor progression once initiation, at 55 days of age, was achieved. The present study compared the effect of preventive treatment with melatonin (10 mg/kg daily) administered for only 15 days before the administration of DMBA with the effect of long-term (6-month) curative treatment with the same dose of melatonin starting the day after DMBA administration. The rats were followed up for a year after the administration of the DMBA. Results The results clearly showed almost identical preventive and curative effects of melatonin on the growth of DMBA-induced mammary ADK. Many hypotheses have been proposed to explain the inhibitory effects of melatonin. However, the mechanisms responsible for its strong preventive effect are still a matter of debate. At least, it can be envisaged that the artificial amplification of the intensity of the circadian rhythm of melatonin could markedly reduce the DNA damage provoked by DMBA and therefore the frequency of cancer initiation. Conclusion In view of the present results, obtained in the female Sprague–Dawley rat, it can be envisaged that the long-term inhibition of mammary ADK promotion by a brief, preventive treatment with melatonin could also reduce the risk of breast cancer induced in women by unidentified environmental factors.
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Affiliation(s)
- Véronique Lenoir
- Laboratoire de neuroendocrinologie, CNRS-FRE2718, UFR Biomédicale des Saints-Pères, Université René Descartes, Paris
| | | | - Marie-Hélène Perrin
- Laboratoire de neuroendocrinologie, CNRS-FRE2718, UFR Biomédicale des Saints-Pères, Université René Descartes, Paris
| | - Antoine Martin
- Service Central d'Anatomie et de Cytologie Pathologique, Hôpital Avicenne, Bobigny, France
| | - Robert Scholler
- Laboratoire de neuroendocrinologie, CNRS-FRE2718, UFR Biomédicale des Saints-Pères, Université René Descartes, Paris
| | - Bernard Kerdelhué
- Laboratoire de neuroendocrinologie, CNRS-FRE2718, UFR Biomédicale des Saints-Pères, Université René Descartes, Paris
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Green M, Wilson C, Newell O, Sadrud-Din S, Thomas R. Diallyl sulfide inhibits diethylstilbesterol-induced DNA adducts in the breast of female ACI rats. Food Chem Toxicol 2005; 43:1323-31. [PMID: 15989972 DOI: 10.1016/j.fct.2005.02.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Diethylstilbestrol (DES) is metabolized to reactive intermediates that produce DNA adducts and ultimately cancer. Diallyl sulfide (DAS) has been shown to inhibit the metabolism of several procarcinogens. The ability of DES to produce DNA adducts in microsomal, mitochondrial, and nuclear in vitro metabolic systems and in the breast of female ACI rats, as well as ability of DAS to inhibit DNA adducts were investigated. Microsomes, mitochondria, and nuclei isolated from breast tissue of female ACI rats were used to catalyze oxidation reactions. Female ACI rats were treated i.p. as follows: (1) corn oil, (2) 200mg/kg DES, (3) 200mg/kg DES/200mg/kg of DAS, (4) 200mg/kg DES/400mg/kg DAS. DES produced DNA adducts in each metabolic system. The relative adduct levels were 2.1 x 10(-4), 6.2 x 10(-6), and 2.9 x 10(-7) in microsomal, mitochondrial, and nuclear reactions, respectively. DAS inhibited DNA adducts in each metabolic system. The percent inhibition ranged from 86% in microsomes to 93% in nuclei. DES produced DNA adducts in mtDNA and nDNA. DAS completely inhibited the DES-induced mtDNA adducts and caused a dose dependent decrease in nDNA adduct formation. These findings suggest that DAS could inhibit DES-induced breast cancer by inhibiting its metabolism.
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Affiliation(s)
- M Green
- Environmental Toxicology Program, College of Pharmacy and Pharmaceutical Sciences, Florida A&M University, Tallahassee, FL 32307, USA
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Flarakos J, Xiong W, Glick J, Vouros P. A Deoxynucleotide Derivatization Methodology for Improving LC-ESI-MS Detection. Anal Chem 2005; 77:2373-80. [PMID: 15828769 DOI: 10.1021/ac0483724] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We have developed a novel LC-UV-MS derivatization method for the analysis of deoxyguanosine monophosphate adducts that demonstrates enhanced signal intensities relative to underivatized analytes in positive ion mode electrospray ionization MS. Detection of DNA nucleotide adducts is normally conducted in negative ion mode, which requires basic mobile phases that make chromatographic separations difficult and reduce MS sensitivity. Utilizing coupling reagents typically employed in peptide synthesis, several different deoxyguanosine nucleotide phosphoramidates and phosphomonoesters were synthesized in high conversion yield and under mild reaction conditions. The derivatives were characterized by MS/MS and reaction conversion yields determined from the DAD-UV traces. The derivatives were evaluated for ionization efficiencies, fragmentation patterns, and reversed-phase chromatographic properties by LC/ESI-MS/MS. Overall, the hydrophobic derivatives showed increases in ionization efficiency and improved peak shape. Rank ordering of the derivatizing agents was initially established using the dGp-modified derivatives. The best derivatizing agent, hexamethyleneimine, showed a 3-4-fold signal enhancement compared to underivatized dGp and was selected for additional evaluation. A model system using the carcinogen, N-acetoxy-2-acetylaminofluorene (AAAF), was used to synthesize a N-acetyl-(2-aminofluorenyl)-guanosine 5'-monophosphate (dGpAAF) adduct, which was subsequently derivatized with hexamethyleneimine. Detection limits for dGphex and dGpAAFhex, purified by HPLC, were 10- and 3-fold higher (S/N) than their respective underivatized analogues. Practical applicability, with similar improvements in sensitivity, was established by derivatizing adducts isolated from calf thymus DNA exposed to AAAF. Our results demonstrate the utility of simple reactions for the enhanced detection of a mononucleotide in positive ion mode ESI MS and the application of this technique for the detection of dGp-DNA adducts at the low-femtomole level.
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Affiliation(s)
- Jimmy Flarakos
- Barnett Institute and Department of Chemistry and Chemical Biology, Northeastern University, Boston, Massachusetts 02115, USA
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Weber-Lotfi F, Obrecht-Pflumio S, Guillemaut P, Kleinpeter J, Dietrich A. Specific plant DNA adducts as molecular biomarkers of genotoxic atmospheric environments. MUTATION RESEARCH-GENETIC TOXICOLOGY AND ENVIRONMENTAL MUTAGENESIS 2005; 581:55-67. [PMID: 15725605 DOI: 10.1016/j.mrgentox.2004.10.020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2004] [Revised: 10/13/2004] [Accepted: 10/31/2004] [Indexed: 12/01/2022]
Abstract
The general purpose of this study was to determine whether the formation of DNA addition products ('adducts') in plants could be a valuable biomarker of genotoxic air pollution. Plants from several species were exposed to ambient atmosphere at urban and suburban sites representative of different environmental conditions. The levels of NO2 and of the quantitatively major genotoxic air pollutants benzene, toluene, and xylene were monitored in parallel with plant exposure. DNA adducts were measured in bean (Phaseolus vulgaris), rye-grass (Lolium perenne), and tobacco (Nicotiana tabacum) seedlings by means of the [32P]-postlabeling method. Whereas, no correlation was found between the levels of the major genotoxic air pollutants and the total amounts of DNA adducts, individual analyses revealed site-specific and plant species-specific adduct responses, both at the qualitative and quantitative level. Among these, the amount of a specific rye-grass DNA adduct (rgs1) correlated with benzene/toluene/xylene levels above a threshold. For further characterization, rye-grass seedlings were treated in controlled conditions with benzene, toluene, xylene or their derivatives. On the other hand, in vitro DNA adduct formation assays were developed involving benzene, toluene, xylene, or their derivatives, and plant microsomes or purified peroxidase. Although in some cases, these approaches produced specific adduct responses, they failed to generate the rgs1 DNA adduct, which appeared to be characteristic for on-site test-plant exposure. Our studies have thus identified an interesting candidate for further analysis of environmental biomarkers of genotoxicity.
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Affiliation(s)
- F Weber-Lotfi
- Institut de Biologie Moléculaire des Plantes du CNRS, Université Louis Pasteur, 12 rue du Général Zimmer, F-67084 Strasbourg, France
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Mohrenweiser HW. Genetic variation and exposure related risk estimation: will toxicology enter a new era? DNA repair and cancer as a paradigm. Toxicol Pathol 2004; 32 Suppl 1:136-45. [PMID: 15209414 DOI: 10.1080/01926230490424671] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
With the vast technological and informational resources increasingly available from investments in "genomics," toxicology and much of biological science, is faced with previously undreamed of opportunities and equally daunting challenges. The ability to generate the large quantities of data becoming routinely available could not be imagined a decade ago. The complexities of data analysis are increasingly the rate-limiting element in scientific advances. The expectations that these large scientific investments will reduce the incidence of human disease and improve health are very high. An emphasis on genetic variation and Toxicogenetics is expected to yield risk estimates for specific rather than average individuals and individuals with varied lifestyles and complex patterns of exposure. Examples from studies of polymorphic variation in DNA repair genes in the healthy population and cancer risk highlight the complexity and challenges of incorporating genetic variation into quantitative estimates of risk associated with environmentally relevant exposures. Similar issues exist in selecting the animal models most appropriate for predicting human risk from environmental exposures to toxic agents.
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Affiliation(s)
- Harvey W Mohrenweiser
- Biology and Biotechnology Research Program, Lawrence Livermore National Laboratory, Livermore, California, USA.
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Wu M, Yan SF, Tan J, Patel DJ, Geacintov NE, Broyde S. Conformational searches elucidate effects of stereochemistry on structures of deoxyadenosine covalently bound to tumorigenic metabolites of benzo[C] phenanthrene. FRONT BIOSCI-LANDMRK 2004; 9:2807-18. [PMID: 15353316 PMCID: PMC4697942 DOI: 10.2741/1438] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Remarkably different conformations can result when DNA binds with stereoisomeric compounds containing differing absolute configurations of substituents about chiral carbon atoms. Furthermore, the biochemical functions of covalent adducts with DNA are strongly affected by the stereochemistry of the ligands. Such stereochemical effects are manifested by DNA covalent adducts derived from metabolites of the non-planar fjord region environmental chemical carcinogen benzo[c]phenanthrene. To analyze these phenomena, an extensive conformational investigation for R and S stereoisomeric adducts to deoxyadenosine, derived from trans addition of enantiomeric anti diol epoxide metabolites of benzo[c]phenanthrene, has been carried out. We have surveyed the potential energy surface of the two adducts by varying systematically at 5 degree intervals in combination, the three important torsion angles that govern conformational flexibility of the carcinogen bulk with respect to the linked nucleoside. We carried out a grid search by creating 373, 248 structures for each isomer, and evaluated their molecular mechanical energies. This has permitted us to map the potential energy surface of each adduct in these three variables, and to delineate their low energy regions. The maps have a symmetric relationship which stems from the near mirror-image stereochemistry in the R and S isomers. This produces near mirror-image low energy structures in the nucleoside adducts. The limited sets of stereoisomer-dependent conformational domains delineated are determined by steric effects. Moreover, these features have been experimentally demonstrated to play governing structural roles in such carcinogen-damaged DNA duplexes: opposite orientations in the stereoisomer pairs computed for the nucleosides are observed by high-resolution NMR in the similarly modified DNA double helices, and are likely to play important roles in their interactions with enzymes involved in DNA transactions, and hence their biological activities.
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Affiliation(s)
- Min Wu
- Department of Chemistry, New York University, New York, NY 10003, USA
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Pavanello S, Siwinska E, Mielzynska D, Clonfero E. GSTM1 null genotype as a risk factor for anti-BPDE-DNA adduct formation in mononuclear white blood cells of coke-oven workers. Mutat Res 2004; 558:53-62. [PMID: 15036119 DOI: 10.1016/j.mrgentox.2003.10.019] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2003] [Revised: 10/13/2003] [Accepted: 10/31/2003] [Indexed: 10/26/2022]
Abstract
The influence of the genetic deletion polymorphism of glutathione S-transferase micro 1 (GSTM1 *0/*0) on levels of anti (+/-)-r-7,t-8-dihydroxy-t-9,10-oxy-7,8,9,10-tetrahydrobenzo[a]pyrene (anti-BPDE-DNA) adduct in the peripheral blood lymphocyte plus monocyte fraction (LMF) of coke-oven workers was investigated. A total of 95 male Polish coke-oven workers (60% current smokers) from two different plants comprised the sample population. Polycyclic aromatic hydrocarbons (PAH) exposure was assessed by means of the individual post-shift urinary excretion of 1-pyrenol (mean +/- S.D.: 6.93 +/- 7.20 micromol/mol creatinine; 70% of the subjects exceeded the proposed biological exposure index (BEI) 2.28 micromol/mol creatinine). Anti-BPDE-DNA adduct levels were detected by high performance liquid chromatography (HPLC)/fluorescence analysis of the anti-BPDE tetrol I-1 released after acid hydrolysis of DNA samples. Genotypes were determined by polymerase chain reaction (PCR) on the genomic DNA of each subject. Coke-oven workers without active GSTM1 (GSTM1 *0/*0, 33%) had significantly higher adduct levels than those with active GSTM1 (GSTM1*1/*1 and *1/*0) (5.90 +/- 5.59 versus 3.25 +/- 2.01 adducts/10(8) bases, Mann-Whitney U-test, z = 2.53, P = 0.011), PAH exposure in the two subgroups being similar (7.06 +/- 6.83 versus 6.67 +/- 8.00 1-pyrenol micromol/mol creatinine). The highest number of GSTM1 null subjects (12/23, 39%) belonged to the quartile with the highest adduct levels (i.e., >4.67 adducts/10(8) nucleotides). That is, coke-oven workers with GSTM1 *0/*0 genotype had a significantly higher risk of having high adduct levels than individuals with active GSTM1 genotype (Fisher exact test P = 0.0355; odds ratio (OR) = 4.145, 95% CI 1.0-18.8). Multiple linear regression analysis showed that the increase in anti-BPDE-DNA adduct levels in LMF was significantly related to the high occupational exposure to PAHs (benzo[a]pyrene (BaP)) of coke-oven workers (t = 3.087, P < 0.01) and to the lack of GSTM1 activity (t = 3.512, P < 0.001), rather than to the two other confounding factors of PAH intake, i.e. charcoal-broiled meat consumption and smoking habits. In conclusion, our results indicate the clear influence of the GSTM1 detoxifying genotype on anti-BPDE-DNA adduct formation in the LMF of coke-oven workers. This is invaluable for future environmental-occupational studies using this biomarker of PAH exposure.
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Affiliation(s)
- Sofia Pavanello
- Occupational Health Section, Department of Environmental and Public Health, University of Padova, Via Giustiniani 2, 35128 Padova, Italy
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Tsai JF, Jeng JE, Chuang LY, Ho MS, Ko YC, Lin ZY, Hsieh MY, Chen SC, Chuang WL, Wang LY, Yu ML, Dai CY. Habitual betel quid chewing and risk for hepatocellular carcinoma complicating cirrhosis. Medicine (Baltimore) 2004; 83:176-187. [PMID: 15118544 DOI: 10.1097/01.md.0000126971.80227.a4] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
This case-control study aimed to assess the independent and interactive role of habitual betel quid chewing and known risk factors for hepatocellular carcinoma (HCC). Subjects enrolled included 210 pairs of sex- and age-matched cirrhotic patients with HCC, patients with cirrhosis alone, and healthy controls. Information on risk factors was obtained through serologic examination of hepatitis B surface antigen (HBsAg) and antibodies to hepatitis C virus (anti-HCV), and a standardized personal interview with a structured questionnaire. Multivariate analysis indicated that betel quid chewing (odds ratio [OR], 5.81; 95% confidence interval [CI], 2.26-14.94); HBsAg (OR, 37.98; 95% CI, 19.65-73.42); and anti-HCV (OR, 47.23; 95% CI, 18.86-118.25) were independent risk factors for HCC when HCC patients were compared with healthy controls. Using patients with cirrhosis alone as a reference group, multivariate analysis indicated that only betel quid chewing (OR, 1.69; 95% CI, 1.04-2.76) and HBsAg (OR, 1.54; 95% CI, l.01-2.37) were independent risk factors for HCC. There was an additive interaction between betel quid chewing and the presence of either HBsAg (synergy index, 5.22) or anti-HCV (synergy index, 1.35). Moreover, a higher risk of HCC was associated with a longer duration of betel quid chewing and a larger amount of betel quid consumed (each p(for trend) < 0.0001). In conclusion, betel quid chewing is an independent risk factor for cirrhotic HCC. There is an additive interaction between betel quid chewing and chronic hepatitis B and/or hepatitis C virus infection.
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Affiliation(s)
- Jung-Fa Tsai
- From the Department of Internal Medicine, Clinical Laboratory, Biochemistry, and Public Health, Kaohsiung Medical University College of Medicine; the National Health Research Institutes, and the Institute of Biomedical Sciences, Academia Sinica, Taiwan
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