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Li W, Li Z, Yan Y, Zhang J, Zhou Q, Wang R, He M. Association of urinary arsenic metabolism with type 2 diabetes and glucose homeostasis: Cross-sectional and longitudinal associations. ENVIRONMENTAL RESEARCH 2023; 239:117410. [PMID: 37858693 DOI: 10.1016/j.envres.2023.117410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Revised: 09/20/2023] [Accepted: 10/11/2023] [Indexed: 10/21/2023]
Abstract
BACKGROUND Previous researches have assessed the relationships of urinary arsenic metabolism with type 2 diabetes (T2D) and glucose-insulin homeostasis, but the results were controversial, and potential mechanisms remain largely unclear. OBJECTIVES This study aimed to investigate the cross-sectional and longitudinal associations of urinary arsenic metabolism with T2D prevalence and glucose changes in relatively higher arsenic exposure, and further to evaluate the underlying roles of oxidative damage in these relationships. METHODS We included 796 participants at baseline, among them 509 participants were followed up after 2 years. Logistic regression model and leave-one-out approach were applied to evaluate the associations of arsenic metabolism with T2D prevalence. Linear mixed model was conducted to estimate the relationship of arsenic metabolism with glycemic changes over two years. The associations between arsenic metabolism and indicators of oxidative stress were assessed with a linear regression model. We further performed mediation analysis to investigate the role of oxidative stress in the associations of arsenic metabolism with 2-year change of glucose levels. RESULTS Higher urinary MMA% increased T2D prevalence and baseline glucose levels. MMA% was positively associated with 2-year change of glucose levels. Moreover, we observed significant dose-response relationship between MMA% and 8-hydroxy-2-deoxyguanosine (8-OHdG). However, the mediating role of 8-OHdG in the association of MMA% and 2-year change of glucose levels was not observed in this population. CONCLUSIONS In this population exposure to relatively higher arsenic levels, higher MMA% contributed to increased T2D prevalence and glucose homeostasis disorder. Arsenic metabolism also affected oxidative stress levels, especially 8-OHdG. Further studies are required to investigate the potential mechanisms.
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Affiliation(s)
- Weiya Li
- Department of Occupational and Environmental Health, Ministry of Education and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Zhaoyang Li
- Department of Occupational and Environmental Health, Ministry of Education and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yan Yan
- Department of Occupational and Environmental Health, Ministry of Education and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Jiazhen Zhang
- Department of Occupational and Environmental Health, Ministry of Education and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Qihang Zhou
- Department of Occupational and Environmental Health, Ministry of Education and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Ruixin Wang
- Department of Occupational and Environmental Health, Ministry of Education and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Meian He
- Department of Occupational and Environmental Health, Ministry of Education and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
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Calderon-Segura ME, Ramírez-Guzmán A, Talavera-Mendoza O, Carbajal-López Y, Martínez-Valenzuela MDC, Mora-Herrera ME, Salinas-Alcántara L, Hurtado-Brito P. Genotoxic Biomonitoring in Children Living near the El Fraile Mine Tailings in Northern Guerrero State, Mexico. TOXICS 2022; 10:674. [PMID: 36355965 PMCID: PMC9694814 DOI: 10.3390/toxics10110674] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Revised: 11/03/2022] [Accepted: 11/03/2022] [Indexed: 06/16/2023]
Abstract
A genotoxic study was conducted with 101 elementary school children (56 girls and 45 boys) in the 6-7, 8-9, and 10-12 age ranges from El Fraile rural community, which is located beside the El Fraile mine tailings in Taxco of Alarcon City, in northern Guerrero State, Mexico. For this, we used the alkaline comet assay in exfoliated buccal mucosa cells, scoring three genotoxic parameters: tail intensity, tail moment, and tail length. Additionally, we detected oxidative DNA damage through urinary 8-OHdG levels by enzyme-linked immunosorbent assay. We also evaluated a control group consisting of 101 children in the same age ranges from Chilpancingo City, Guerrero, who had never lived near mining zones. Genotoxic results showed that there was a significant increase in three genotoxic parameters and urinary 8-OHdG levels in the exposed children group compared with the control group. Analysis of MANOVA revealed that boys aged 8 and 9 years had higher DNA damage than girls from the same exposure group, and Spearman's analysis identified a positive correlation between DNA damage and sex and age. This study provides the first valuable genotoxic data in children living in areas with environmental pollution.
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Affiliation(s)
- María Elena Calderon-Segura
- Laboratorio de Toxicología Ambiental, Departamento de Ciencias Ambientales, Instituto de Ciencias de la Atmósfera y Cambio Climático, Universidad Nacional Autónoma de México, Ciudad Universitaria Coyoacán, Ciudad de México 04510, Mexico
| | - Alejandro Ramírez-Guzmán
- Escuela Superior de Ciencias de la Tierra, Universidad Autónoma de Guerrero, Ex Hacienda de San Juan Bautista s/n, Taxco el Viejo 40323, Mexico
| | - Oscar Talavera-Mendoza
- Escuela Superior de Ciencias de la Tierra, Universidad Autónoma de Guerrero, Ex Hacienda de San Juan Bautista s/n, Taxco el Viejo 40323, Mexico
| | - Yolanda Carbajal-López
- Facultad de Ciencias Químico Biológicas, Universidad Autónoma de Guerrero, Av. Lázaro Cárdenas s/n, Chilpancingo de los Bravo 39087, Mexico
| | - María del Carmen Martínez-Valenzuela
- Instituto de Investigaciones en Ambiente y Salud, Universidad Autónoma de Occidente, Boulevar Macario Gaxiola, Carretera Internacional, Los Mochis 81200, Mexico
| | - Martha Elena Mora-Herrera
- Laboratorio de Fisiología y Biotecnología Vegetal, Centro Universitario Tenancingo, Universidad Autónoma, Tenancingo 52400, Mexico
| | - Liliana Salinas-Alcántara
- Laboratorio de Toxicología Ambiental, Departamento de Ciencias Ambientales, Instituto de Ciencias de la Atmósfera y Cambio Climático, Universidad Nacional Autónoma de México, Ciudad Universitaria Coyoacán, Ciudad de México 04510, Mexico
| | - Patricia Hurtado-Brito
- Laboratorio de Toxicología Ambiental, Departamento de Ciencias Ambientales, Instituto de Ciencias de la Atmósfera y Cambio Climático, Universidad Nacional Autónoma de México, Ciudad Universitaria Coyoacán, Ciudad de México 04510, Mexico
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De Loma J, Krais AM, Lindh CH, Mamani J, Tirado N, Gardon J, Broberg K. Arsenic exposure and biomarkers for oxidative stress and telomere length in indigenous populations in Bolivia. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2022; 231:113194. [PMID: 35051766 DOI: 10.1016/j.ecoenv.2022.113194] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Revised: 01/09/2022] [Accepted: 01/10/2022] [Indexed: 06/14/2023]
Abstract
BACKGROUND Women living in the Bolivian Andes are environmentally exposed to arsenic, yet there is scarce information about arsenic-related effects in this region. Several biomarkers for telomere length and oxidative stress (mitochondrial DNA copy number, mtDNAcn; 8-Oxo-2'-deoxyguanosine, 8-oxo-dG; and 4-hydroxy nonenal mercapturic acid, 4-HNE-MA) have been previously linked to arsenic, and some of which are prospective biomarkers for cancer risk. OBJECTIVE AND HYPOTHESIS To evaluate associations between arsenic exposure and telomere length, mtDNAcn, 8-oxo-dG, and 4-HNE-MA in Bolivians. Arsenic exposure was hypothesized to be positively associated with all four toxicity biomarkers, particularly in individuals with a less efficient arsenic metabolism. METHODS The study encompassed 193 indigenous women. Arsenic exposure was assessed in urine as the sum of inorganic arsenic metabolite concentrations (U-As) measured by HPLC-HG-ICP-MS, and in whole blood as total arsenic (B-As) measured by ICP-MS. Efficiency of arsenic metabolism was evaluated by a polymorphism (rs3740393) in the main arsenic methylating gene AS3MT measured by TaqMan allelic discrimination, and by the relative fractions of urinary inorganic arsenic metabolites. Telomere length and mtDNAcn were determined in peripheral blood leukocytes by quantitative PCR, and urinary 8-oxo-dG and 4-HNE-MA by LC-MS/MS. RESULTS U-As and B-As were associated with longer telomeres and higher mtDNAcn, particularly in women with a less efficient arsenic metabolism. Urinary 8-oxo-dG and 4-HNE-MA were positively associated with U-As, but only 4-HNE-MA was associated with B-As. Arsenic metabolism efficiency did not have a clear effect on the concentrations of either of these biomarkers. CONCLUSION Bolivian women showed indications of arsenic toxicity, measured by four different biomarkers. Telomere length, mtDNAcn, and 4-HNE-MA were positively associated with both U-As and B-As. The association of arsenic exposure with telomere length and mtDNAcn was only present in Bolivian women with a less efficient metabolism. These findings call for additional efforts to evaluate and reduce arsenic exposure in Bolivia.
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Affiliation(s)
- Jessica De Loma
- Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden.
| | - Annette M Krais
- Department of Laboratory Medicine, Division of Occupational and Environmental Medicine, Lund University, Lund, Sweden
| | - Christian H Lindh
- Department of Laboratory Medicine, Division of Occupational and Environmental Medicine, Lund University, Lund, Sweden
| | - Josue Mamani
- Genetics Institute, Universidad Mayor de San Andrés, La Paz, Bolivia
| | - Noemi Tirado
- Genetics Institute, Universidad Mayor de San Andrés, La Paz, Bolivia
| | - Jacques Gardon
- Hydrosciences Montpellier, Université de Montpellier, Institut de Recherche pour le Développement, Centre National de la Recherche Scientifique, Montpellier, France
| | - Karin Broberg
- Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
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Kordas K, Roy A, Vahter M, Ravenscroft J, Mañay N, Peregalli F, Martínez G, Queirolo EI. Multiple-metal exposure, diet, and oxidative stress in Uruguayan school children. ENVIRONMENTAL RESEARCH 2018; 166:507-515. [PMID: 29957504 PMCID: PMC6110975 DOI: 10.1016/j.envres.2018.06.028] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2018] [Revised: 06/02/2018] [Accepted: 06/13/2018] [Indexed: 05/05/2023]
Abstract
Oxidative stress (OS) is an important consequence of exposure to toxic metals but it is unclear to what extent low-level metal exposures contribute to OS in children. We examined the cross-sectional association between urinary concentrations of arsenic (As), cadmium (Cd), and lead (Pb) and urinary markers of OS: F2-8α isoprostane and 8-hydroxy-2-deoxy-guanosine (8-OHdG). We also tested effect modification by dietary intakes. Of the 211 children aged 6-8 years living in Montevideo who were eligible for the study because they had at least one OS marker measured via ELISA, 143 were included in a complete-case analysis. Urinary metals were measured with inductively coupled plasma mass spectrometry (ICP-MS: Pb, Cd) and high-performance liquid chromatography online with hydride generation ICP-MS (As-metabolites); concentrations were log2-transformed. All urinary markers were adjusted for specific gravity of urine. Two 24-h dietary recalls were conducted to estimate children's dietary intakes, including total fruit and vegetable consumption and vitamin C, zinc and fiber intake. Ordinary least square (OLS) and weighted quantile sum (WQS) regressions were used to estimate the association between metals and each OS marker as outcome. Metal exposure was generally low: median urinary As, Cd, Pb 9.6 μg/L, 0.06 μg/L and 1.9 μg/L, respectively. Median 8-isoprostane concentration was 1.1 and 8-OHdG 39.6 ng/mL. Log2-transformed urinary As concentrations were positively associated with 8-OHdG concentrations (10.90 [3.82, 17.97]) in covariate-adjusted OLS models which also took account of exposure to Cd and Pb. In WQS, a mixture index was also associated with higher 8-OHdG (8.71 [1.12, 16.3] for each 25% increase in index value), mostly driven by As exposure. There was little evidence of effect modification by dietary antioxidants. In sum, even at low-level, As exposure is associated with detectable oxidative damage to the DNA.
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Affiliation(s)
- Katarzyna Kordas
- Department of Epidemiology and Environmental Health, SUNY at Buffalo, Buffalo, NY, USA.
| | - Aditi Roy
- Department of Pediatrics; Vanderbilt University Medical Center, Nashville, TN, USA
| | - Marie Vahter
- Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Julia Ravenscroft
- Department of Epidemiology and Environmental Health, SUNY at Buffalo, Buffalo, NY, USA
| | - Nelly Mañay
- Faculty of Chemistry, University of the Republic of Uruguay (UDELAR), Montevideo, Uruguay
| | - Fabiana Peregalli
- Center for Research, Faculty of Psychology, Catholic University of Uruguay, Montevideo, Uruguay
| | - Gabriela Martínez
- Faculty of Chemistry, University of the Republic of Uruguay (UDELAR), Montevideo, Uruguay
| | - Elena I Queirolo
- Center for Research, Faculty of Psychology, Catholic University of Uruguay, Montevideo, Uruguay
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Dashner-Titus EJ, Hoover J, Li L, Lee JH, Du R, Liu KJ, Traber MG, Ho E, Lewis J, Hudson LG. Metal exposure and oxidative stress markers in pregnant Navajo Birth Cohort Study participants. Free Radic Biol Med 2018; 124:484-492. [PMID: 29723666 PMCID: PMC6381929 DOI: 10.1016/j.freeradbiomed.2018.04.579] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/23/2018] [Revised: 04/26/2018] [Accepted: 04/27/2018] [Indexed: 12/22/2022]
Abstract
Contamination of soil and water by waste from abandoned uranium mines has led to chronic exposures to metal mixtures in Native American communities. Our previous work demonstrated that community exposures to mine waste increase the likelihood of developing cardiovascular disease, as well as the likelihood of developing multiple chronic diseases including diabetes, hypertension and kidney disease. Exposure to various environmental metals is associated with elevated oxidative stress, which is considered a contributor to these and other chronic disease states. The purpose of the current research was to assess potential associations between exposure to uranium and arsenic and evidence for increased oxidative stress as measured by urinary F2 -isoprostanes in pregnant women enrolled in the Navajo Birth Cohort Study. The current study also included an analysis of zinc as a potential mediator of oxidative stress in the study population. Urinary arsenic and uranium, serum zinc and urinary F2 -isoprostanes were measured for each study participant at enrollment. Study participants were pregnant women with median age of 26.8; 18.9% were enrolled in the 1st trimester, 44.7% were enrolled in the 2nd trimester, and 36.4% were enrolled in the 3rd trimester. Median urinary metal levels were 5.5 and 0.016 µg/g creatinine for arsenic and uranium, respectively. Multivariable regression analysis indicated a significant association between arsenic exposure and the lipid peroxidation product 8-iso-prostaglandin F2α, controlling for zinc and trimester. No associations were detected with uranium despite evidence that levels were in the Navajo Birth Cohort samples were 2.3 times the median reported for women in the National Health and Nutrition Examination Survey (2011-12). Zinc was not found to have any causal mediation of the effects of the other metals on oxidative stress. The current work is consistent with other studies that have detected an association between arsenic and elevated oxidative stress. In contrast to arsenic, uranium did not appear to increase oxidative stress response in this study population. These findings are relevant to assessing the potential human impact of chronic exposure to mixed metal waste from abandoned uranium mines.
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Affiliation(s)
- Erica J Dashner-Titus
- Department of Pharmaceutical Sciences, College of Pharmacy, University of New Mexico, 1 University of New Mexico, Albuquerque, NM, USA.
| | - Joseph Hoover
- Community Environmental Health Program, College Of Pharmacy, University of New Mexico, 1 University of New Mexico, Albuquerque, NM 87131, USA.
| | - Luo Li
- Biostatistics Shared Resource, The UNM Comprehensive Cancer Center, Albuquerque, NM, 87131, USA; UNM METALS Biostatistics and Data Management (BDM) Core (Luo, Senior author for BDM team).
| | - Ji-Hyun Lee
- Division of Quantitative Sciences and Biostatistics Shared Resource, University of Florida Health Cancer Center Gainsville , FL 32601, USA.
| | - Ruofei Du
- Biostatistics Shared Resource, The UNM Comprehensive Cancer Center, Albuquerque, NM, 87131, USA; UNM METALS Biostatistics and Data Management (BDM) Core (Luo, Senior author for BDM team).
| | - Ke Jian Liu
- Department of Pharmaceutical Sciences, College of Pharmacy, University of New Mexico, 1 University of New Mexico, Albuquerque, NM, USA.
| | - Maret G Traber
- Linus Pauling Institute, Oregon State University, 307 Linus Pauling Science Center, Corvallis, OR 97331, USA.
| | - Emily Ho
- Linus Pauling Institute, Oregon State University, 307 Linus Pauling Science Center, Corvallis, OR 97331, USA; Moore Family Center for Whole Grain Foods, Nutrition & Preventive Health, School of Biological & Population Health Sciences, College of Public Health & Human Sciences, 211 Milam Hall, Oregon State University, Corvallis, OR 97331, USA.
| | - Johnnye Lewis
- Community Environmental Health Program, College Of Pharmacy, University of New Mexico, 1 University of New Mexico, Albuquerque, NM 87131, USA.
| | - Laurie G Hudson
- Department of Pharmaceutical Sciences, College of Pharmacy, University of New Mexico, 1 University of New Mexico, Albuquerque, NM, USA.
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de la Rosa R, Steinmaus C, Akers NK, Conde L, Ferreccio C, Kalman D, Zhang KR, Skibola CF, Smith AH, Zhang L, Smith MT. Associations between arsenic (+3 oxidation state) methyltransferase (AS3MT) and N-6 adenine-specific DNA methyltransferase 1 (N6AMT1) polymorphisms, arsenic metabolism, and cancer risk in a chilean population. ENVIRONMENTAL AND MOLECULAR MUTAGENESIS 2017; 58:411-422. [PMID: 28640505 PMCID: PMC5515250 DOI: 10.1002/em.22104] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Accepted: 05/13/2017] [Indexed: 05/12/2023]
Abstract
Inter-individual differences in arsenic metabolism have been linked to arsenic-related disease risks. Arsenic (+3) methyltransferase (AS3MT) is the primary enzyme involved in arsenic metabolism, and we previously demonstrated in vitro that N-6 adenine-specific DNA methyltransferase 1 (N6AMT1) also methylates the toxic inorganic arsenic (iAs) metabolite, monomethylarsonous acid (MMA), to the less toxic dimethylarsonic acid (DMA). Here, we evaluated whether AS3MT and N6AMT1 gene polymorphisms alter arsenic methylation and impact iAs-related cancer risks. We assessed AS3MT and N6AMT1 polymorphisms and urinary arsenic metabolites (%iAs, %MMA, %DMA) in 722 subjects from an arsenic-cancer case-control study in a uniquely exposed area in northern Chile. Polymorphisms were genotyped using a custom designed multiplex, ligation-dependent probe amplification (MLPA) assay for 6 AS3MT SNPs and 14 tag SNPs in the N6AMT1 gene. We found several AS3MT polymorphisms associated with both urinary arsenic metabolite profiles and cancer risk. For example, compared to wildtypes, individuals carrying minor alleles in AS3MT rs3740393 had lower %MMA (mean difference = -1.9%, 95% CI: -3.3, -0.4), higher %DMA (mean difference = 4.0%, 95% CI: 1.5, 6.5), and lower odds ratios for bladder (OR = 0.3; 95% CI: 0.1-0.6) and lung cancer (OR = 0.6; 95% CI: 0.2-1.1). Evidence of interaction was also observed for both lung and bladder cancer between these polymorphisms and elevated historical arsenic exposures. Clear associations were not seen for N6AMT1. These results are the first to demonstrate a direct association between AS3MT polymorphisms and arsenic-related internal cancer risk. This research could help identify subpopulations that are particularly vulnerable to arsenic-related disease. Environ. Mol. Mutagen. 58:411-422, 2017. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Rosemarie de la Rosa
- Superfund Research Program, Divisions of Environmental Health Sciences and Epidemiology, School of Public Health, University of California, Berkeley, California
| | - Craig Steinmaus
- Superfund Research Program, Divisions of Environmental Health Sciences and Epidemiology, School of Public Health, University of California, Berkeley, California
| | - Nicholas K Akers
- Superfund Research Program, Divisions of Environmental Health Sciences and Epidemiology, School of Public Health, University of California, Berkeley, California
| | - Lucia Conde
- Superfund Research Program, Divisions of Environmental Health Sciences and Epidemiology, School of Public Health, University of California, Berkeley, California
| | - Catterina Ferreccio
- Departamento de Salud Pública, Facultad de Medicina, Pontificia Universidad Católica de Chile, Advanced Center for Chronic Diseases, ACCDiS, Santiago, Chile
| | - David Kalman
- Department of Environmental & Occupational Health Sciences, School of Public Health, University of Washington, Seattle, Washington, DC
| | - Kevin R Zhang
- Superfund Research Program, Divisions of Environmental Health Sciences and Epidemiology, School of Public Health, University of California, Berkeley, California
| | - Christine F Skibola
- Superfund Research Program, Divisions of Environmental Health Sciences and Epidemiology, School of Public Health, University of California, Berkeley, California
| | - Allan H Smith
- Superfund Research Program, Divisions of Environmental Health Sciences and Epidemiology, School of Public Health, University of California, Berkeley, California
| | - Luoping Zhang
- Superfund Research Program, Divisions of Environmental Health Sciences and Epidemiology, School of Public Health, University of California, Berkeley, California
| | - Martyn T Smith
- Superfund Research Program, Divisions of Environmental Health Sciences and Epidemiology, School of Public Health, University of California, Berkeley, California
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Kamal AM, El-Hefny NH, Hegab HM, El-Mesallamy HO. Expression of thioredoxin-1 (TXN) and its relation with oxidative DNA damage and treatment outcome in adult AML and ALL: A comparative study. ACTA ACUST UNITED AC 2016; 21:567-575. [PMID: 27158980 DOI: 10.1080/10245332.2016.1173341] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
OBJECTIVE Thioredoxin-1 (TXN) is a key element in the elimination of reactive oxygen species as well as activation of tumor suppressor genes and DNA repair enzymes. Several studies showed that TXN was over expressed in solid tumors and this was correlated to poorer prognosis. However, TXN expression has been insufficiently studied, particularly in newly diagnosed adult acute leukemia. METHODS This study was designed to evaluate the gene expression of TXN in acute myeloid leukemia (AML) and acute lymphoid leukemia (ALL) adult patients and to investigate its association with oxidative DNA damage. The expression of TXN was analyzed using quantitative reverse transcriptase-polymerase chain reaction while oxidative DNA damage was evaluated by measuring serum 8-hydroxy-2-deoxyguanosine (8-OHdG) by enzyme-linked immunosorbent assay and strand breaks by the comet assay. RESULTS We found that TXN was under expressed in both AML and ALL groups (P < 0.001 for both) as compared to the control group. Also TXN expression level was negatively correlated with serum 8-OHdG and tail moment in both AML (P = 0.042 and 0.047, respectively) and ALL (P < 0.001 and P = 0.02, respectively) while it showed no correlation with treatment outcome in either groups. DISCUSSION This study suggests that TXN expression is hindered in adult acute leukemia which augments oxidative DNA damage and hence mutagenesis. CONCLUSION This study provides a new insight into the pathogenesis of acute leukemia and suggests TXN as a new screening test for the risk for acute leukemia.
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Affiliation(s)
- Amany M Kamal
- a Department of Biochemistry, Faculty of Pharmacy , Ain Shams University , Cairo , Egypt
| | - Nadia H El-Hefny
- a Department of Biochemistry, Faculty of Pharmacy , Ain Shams University , Cairo , Egypt
| | - Hany M Hegab
- b Department of Clinical Hematology, Faculty of Medicine , Ain Shams University , Cairo , Egypt
| | - Hala O El-Mesallamy
- a Department of Biochemistry, Faculty of Pharmacy , Ain Shams University , Cairo , Egypt
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Gao J, Tong L, Argos M, Scannell Bryan M, Ahmed A, Rakibuz-Zaman M, Kibriya MG, Jasmine F, Slavkovich V, Graziano JH, Ahsan H, Pierce BL. The Genetic Architecture of Arsenic Metabolism Efficiency:A SNP-Based Heritability Study of Bangladeshi Adults. ENVIRONMENTAL HEALTH PERSPECTIVES 2015; 123:985-92. [PMID: 25768001 PMCID: PMC4590755 DOI: 10.1289/ehp.1408909] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2014] [Accepted: 03/11/2015] [Indexed: 05/04/2023]
Abstract
BACKGROUND Consumption of arsenic-contaminated drinking water adversely affects health. There is interindividual variation in arsenic metabolism efficiency, partially due to genetic variation in the arsenic methyltransferase (AS3MT) gene region. OBJECTIVES The goal of this study was to assess the overall contribution of genetic factors to variation in arsenic metabolism efficiency, as measured by the relative concentration of dimethylarsinic acid (DMA%) in urine. METHODS Using data on genome-wide single nucleotide polymorphisms (SNPs) and urinary DMA% for 2,053 arsenic-exposed Bangladeshi individuals, we employed various SNP-based approaches for heritability estimation and polygenic modeling. RESULTS Using data on all participants, the percent variance explained (PVE) for DMA% by all measured and imputed SNPs was 16% (p = 0.08), which was reduced to 5% (p = 0.34) after adjusting for AS3MT SNPs. Using information on close relatives only, the PVE was 63% (p = 0.0002), but decreased to 41% (p = 0.01) after adjusting for AS3MT SNPs. Regional heritability analysis confirmed 10q24.32 (AS3MT) as a major arsenic metabolism locus (PVE = 7%, p = 4.4 × 10(-10)), but revealed no additional regions. We observed a moderate association between a polygenic score reflecting elevated DMA% (composed of thousands of non-AS3MT SNPs) and reduced skin lesion risk in an independent sample (p < 0.05). We observed no associations for SNPs reported in prior candidate gene studies of arsenic metabolism. CONCLUSIONS Our results suggest that there are common variants outside of the AS3MT region that influence arsenic metabolism in Bangladeshi individuals, but the effects of these variants are very weak compared with variants near AS3MT. The high heritability estimates observed using family-based heritability approaches suggest substantial effects for rare variants and/or unmeasured environmental factors.
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Affiliation(s)
- Jianjun Gao
- Department of Public Health Sciences, The University of Chicago, Chicago, Illinois, USA
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Eichstaedt CA, Antão T, Cardona A, Pagani L, Kivisild T, Mormina M. Genetic and phenotypic differentiation of an Andean intermediate altitude population. Physiol Rep 2015; 3:e12376. [PMID: 25948820 PMCID: PMC4463816 DOI: 10.14814/phy2.12376] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2015] [Revised: 03/15/2015] [Accepted: 03/19/2015] [Indexed: 12/21/2022] Open
Abstract
Highland populations living permanently under hypobaric hypoxia have been subject of extensive research because of the relevance of their physiological adaptations for the understanding of human health and disease. In this context, what is considered high altitude is a matter of interpretation and while the adaptive processes at high altitude (above 3000 m) are well documented, the effects of moderate altitude (below 3000 m) on the phenotype are less well established. In this study, we compare physiological and anthropometric characteristics as well as genetic variations in two Andean populations: the Calchaquíes (2300 m) and neighboring Collas (3500 m). We compare their phenotype and genotype to the sea-level Wichí population. We measured physiological (heart rate, oxygen saturation, respiration rate, and lung function) as well as anthropometric traits (height, sitting height, weight, forearm, and tibia length). We conducted genome-wide genotyping on a subset of the sample (n = 74) and performed various scans for positive selection. At the phenotypic level (n = 179), increased lung capacity stood out in both Andean groups, whereas a growth reduction in distal limbs was only observed at high altitude. At the genome level, Calchaquíes revealed strong signals around PRKG1, suggesting that the nitric oxide pathway may be a target of selection. PRKG1 was highlighted by one of four selection tests among the top five genes using the population branch statistic. Selection tests results of Collas were reported previously. Overall, our study shows that some phenotypic and genetic differentiation occurs at intermediate altitude in response to moderate lifelong selection pressures.
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Affiliation(s)
- Christina A Eichstaedt
- Division of Biological Anthropology, University of Cambridge, Cambridge, Cambridgeshire, UK Centre for Pulmonary Hypertension, Thoraxclinic at the University Hospital Heidelberg, Heidelberg, Baden-Württemberg, Germany
| | - Tiago Antão
- Department of Vector Biology, Liverpool School of Tropical Medicine, Liverpool, Lancashire, UK
| | - Alexia Cardona
- Division of Biological Anthropology, University of Cambridge, Cambridge, Cambridgeshire, UK
| | - Luca Pagani
- Division of Biological Anthropology, University of Cambridge, Cambridge, Cambridgeshire, UK Wellcome Trust Sanger Institute, Hinxton, Cambridgeshire, UK
| | - Toomas Kivisild
- Division of Biological Anthropology, University of Cambridge, Cambridge, Cambridgeshire, UK
| | - Maru Mormina
- Division of Biological Anthropology, University of Cambridge, Cambridge, Cambridgeshire, UK Faculty of Humanities and Social Sciences, University of Winchester, Winchester, Hampshire, UK School of Chemistry, University of East Anglia, Norwich, Norfolk, UK
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Titanium-based nanocomposite materials: A review of recent advances and perspectives. Colloids Surf B Biointerfaces 2015; 126:121-37. [DOI: 10.1016/j.colsurfb.2014.11.049] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2014] [Revised: 11/27/2014] [Accepted: 11/30/2014] [Indexed: 11/22/2022]
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Wojdacz TK, Bottai M, Vahter M, Broberg K. Exposure to arsenic and intra-chromosomal instability in blood. Metallomics 2014; 6:1387-9. [PMID: 25025787 DOI: 10.1039/c4mt00128a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The 450k Chip Analysis Methylation Pipeline (ChAMP) is a novel Illumina Infinium HumanMethylation450 BeadChip data processing algorithm that allows the analysis of copy number alterations (CNAs). With this pipeline we evaluated the prevalence of CNAs in peripheral blood leukocyte samples from healthy Argentinean Andean women with varying exposure to inorganic arsenic in drinking water. Arsenic exposure was assessed based on the sum concentrations of metabolites of inorganic arsenic in urine (U-As), which ranged from 10-663 μg L(-1) with a median of 185 μg L(-1). We used linear regression analysis to elucidate the association between U-As and the prevalence of CNAs. We found that increasing arsenic exposure was positively associated with the frequency of CNAs (p = 0.002), possibly in a dose-response relationship. Adjustment of the regression model for age and BMI of the subjects did not significantly change the effect estimate, although both covariates were significant predictors. Our results suggest that exposure to arsenic increases genomic instability in the form of CNAs.
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Affiliation(s)
- Tomasz K Wojdacz
- Unit of Metals and Health, Institute of Environmental Medicine, Karolinska Institutet, Stockholm, SE - 171 77, Sweden.
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Harper KN, Liu X, Hall MN, Ilievski V, Oka J, Calancie L, Slavkovich V, Levy D, Siddique A, Alam S, Mey JL, van Geen A, Graziano JH, Gamble MV. A dose-response study of arsenic exposure and markers of oxidative damage in Bangladesh. J Occup Environ Med 2014; 56:652-8. [PMID: 24854259 PMCID: PMC4050339 DOI: 10.1097/jom.0000000000000166] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
OBJECTIVE To evaluate the dose-response relationship between arsenic (As) exposure and markers of oxidative damage in Bangladeshi adults. METHODS We recruited 378 participants drinking water from wells assigned to five water As exposure categories; the distribution of subjects was as follows: (1) less than 10 μg/L (n=76); (2) 10 to 100 μg/L (n=104); (3) 101 to 200 μg/L (n=86); (4) 201 to 300 μg/L (n=67); and (5) more than 300 μg/L (n=45). Arsenic concentrations were measured in well water, as well as in urine and blood. Urinary 8-oxo-2'-deoxyguanosine and plasma protein carbonyls were measured to assess oxidative damage. RESULTS None of our measures of As exposure were significantly associated with protein carbonyl or 8-oxo-2'-deoxyguanosine levels. CONCLUSIONS We found no evidence to support a significant relationship between long-term exposure to As-contaminated drinking water and biomarkers of oxidative damage among Bangladeshi adults.
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Affiliation(s)
- Kristin N. Harper
- Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University, New York, NY 10032
| | - Xinhua Liu
- Department of Biostatistics, Mailman School of Public Health, Columbia University, New York, NY 10032
| | - Megan N. Hall
- Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, NY 10032
| | - Vesna Ilievski
- Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University, New York, NY 10032
| | - Julie Oka
- Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University, New York, NY 10032
| | - Larissa Calancie
- Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University, New York, NY 10032
| | - Vesna Slavkovich
- Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University, New York, NY 10032
| | - Diane Levy
- Department of Biostatistics, Mailman School of Public Health, Columbia University, New York, NY 10032
| | - Abu Siddique
- Columbia University Arsenic Project in Bangladesh, Dhaka, Bangladesh
| | - Shafiul Alam
- Columbia University Arsenic Project in Bangladesh, Dhaka, Bangladesh
| | - Jacob L. Mey
- Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964
- Kingsbridge Community College, New York, NY 11235
| | - Alexander van Geen
- Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964
| | - Joseph H. Graziano
- Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University, New York, NY 10032
| | - Mary V. Gamble
- Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University, New York, NY 10032
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Hall MN, Niedzwiecki M, Liu X, Harper KN, Alam S, Slavkovich V, Ilievski V, Levy D, Siddique AB, Parvez F, Mey JL, van Geen A, Graziano J, Gamble MV. Chronic arsenic exposure and blood glutathione and glutathione disulfide concentrations in Bangladeshi adults. ENVIRONMENTAL HEALTH PERSPECTIVES 2013; 121:1068-74. [PMID: 23792557 PMCID: PMC3764071 DOI: 10.1289/ehp.1205727] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2012] [Accepted: 06/19/2013] [Indexed: 05/20/2023]
Abstract
BACKGROUND In vitro and rodent studies have shown that arsenic (As) exposure can deplete glutathione (GSH) and induce oxidative stress. GSH is the primary intracellular antioxidant; it donates an electron to reactive oxygen species, thus producing glutathione disulfide (GSSG). Cysteine (Cys) and cystine (CySS) are the predominant thiol/disulfide redox couple found in human plasma. Arsenic, GSH, and Cys are linked in several ways: a) GSH is synthesized via the transsulfuration pathway, and Cys is the rate-limiting substrate; b) intermediates of the methionine cycle regulate both the transsulfuration pathway and As methylation; c) GSH serves as the electron donor for reduction of arsenate to arsenite; and d) As has a high affinity for sulfhydryl groups and therefore binds to GSH and Cys. OBJECTIVES We tested the hypothesis that As exposure is associated with decreases in GSH and Cys and increases in GSSG and CySS (i.e., a more oxidized environment). METHODS For this cross-sectional study, the Folate and Oxidative Stress Study, we recruited a total of 378 participants from each of five water As concentration categories: < 10 (n = 76), 10-100 (n = 104), 101-200 (n = 86), 201-300 (n = 67), and > 300 µg/L (n = 45). Concentrations of GSH, GSSG, Cys, and CySS were measured using HPLC. RESULTS An interquartile range (IQR) increase in water As was negatively associated with blood GSH (mean change, -25.4 µmol/L; 95% CI: -45.3, -5.31) and plasma CySS (mean change, -3.00 µmol/L; 95% CI: -4.61, -1.40). We observed similar associations with urine and blood As. There were no significant associations between As exposure and blood GSSG or plasma Cys. CONCLUSIONS The observed associations are consistent with the hypothesis that As may influence concentrations of GSH and other nonprotein sulfhydryls through binding and irreversible loss in bile and/or possibly in urine.
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Affiliation(s)
- Megan N Hall
- Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, New York, USA
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Barregard L, Møller P, Henriksen T, Mistry V, Koppen G, Rossner P, Sram RJ, Weimann A, Poulsen HE, Nataf R, Andreoli R, Manini P, Marczylo T, Lam P, Evans MD, Kasai H, Kawai K, Li YS, Sakai K, Singh R, Teichert F, Farmer PB, Rozalski R, Gackowski D, Siomek A, Saez GT, Cerda C, Broberg K, Lindh C, Hossain MB, Haghdoost S, Hu CW, Chao MR, Wu KY, Orhan H, Senduran N, Smith RJ, Santella RM, Su Y, Cortez C, Yeh S, Olinski R, Loft S, Cooke MS. Human and methodological sources of variability in the measurement of urinary 8-oxo-7,8-dihydro-2'-deoxyguanosine. Antioxid Redox Signal 2013; 18. [PMID: 23198723 PMCID: PMC3671631 DOI: 10.1089/ars.2012.4714] [Citation(s) in RCA: 122] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
AIMS Urinary 8-oxo-7,8-dihydro-2'-deoxyguanosine (8-oxodG) is a widely used biomarker of oxidative stress. However, variability between chromatographic and ELISA methods hampers interpretation of data, and this variability may increase should urine composition differ between individuals, leading to assay interference. Furthermore, optimal urine sampling conditions are not well defined. We performed inter-laboratory comparisons of 8-oxodG measurement between mass spectrometric-, electrochemical- and ELISA-based methods, using common within-technique calibrants to analyze 8-oxodG-spiked phosphate-buffered saline and urine samples. We also investigated human subject- and sample collection-related variables, as potential sources of variability. RESULTS Chromatographic assays showed high agreement across urines from different subjects, whereas ELISAs showed far more inter-laboratory variation and generally overestimated levels, compared to the chromatographic assays. Excretion rates in timed 'spot' samples showed strong correlations with 24 h excretion (the 'gold' standard) of urinary 8-oxodG (rp 0.67-0.90), although the associations were weaker for 8-oxodG adjusted for creatinine or specific gravity (SG). The within-individual excretion of 8-oxodG varied only moderately between days (CV 17% for 24 h excretion and 20% for first void, creatinine-corrected samples). INNOVATION This is the first comprehensive study of both human and methodological factors influencing 8-oxodG measurement, providing key information for future studies with this important biomarker. CONCLUSION ELISA variability is greater than chromatographic assay variability, and cannot determine absolute levels of 8-oxodG. Use of standardized calibrants greatly improves intra-technique agreement and, for the chromatographic assays, importantly allows integration of results for pooled analyses. If 24 h samples are not feasible, creatinine- or SG-adjusted first morning samples are recommended.
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Affiliation(s)
- Lars Barregard
- Department of Occupational and Environmental Medicine, University of Gothenburg, Gothenburg, Sweden.
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Tellez-Plaza M, Gribble MO, Voruganti VS, Francesconi KA, Goessler W, Umans JG, Silbergeld EK, Guallar E, Franceschini N, North KE, Kao WH, MacCluer JW, Cole SA, Navas-Acien A. Heritability and preliminary genome-wide linkage analysis of arsenic metabolites in urine. ENVIRONMENTAL HEALTH PERSPECTIVES 2013; 121:345-51. [PMID: 23322787 PMCID: PMC3621197 DOI: 10.1289/ehp.1205305] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2012] [Accepted: 01/14/2013] [Indexed: 05/19/2023]
Abstract
BACKGROUND Arsenic (III) methyltransferase (AS3MT) has been related to urine arsenic metabolites in association studies. Other genes might also play roles in arsenic metabolism and excretion. OBJECTIVE We evaluated genetic determinants of urine arsenic metabolites in American Indian adults from the Strong Heart Study (SHS). METHODS We evaluated heritability of urine arsenic metabolites [percent inorganic arsenic (%iAs), percent monomethylarsonate (%MMA), and percent dimethylarsinate (%DMA)] in 2,907 SHS participants with urine arsenic measurements and at least one relative within the cohort. We conducted a preliminary linkage analysis in a subset of 487 participants with available genotypes on approximately 400 short tandem repeat markers using a general pedigree variance component approach for localizing quantitative trait loci (QTL). RESULTS The medians (interquartile ranges) for %iAs, %MMA, and %DMA were 7.7% (5.4-10.7%), 13.6% (10.5-17.1%), and 78.4% (72.5-83.1%), respectively. The estimated heritability was 53% for %iAs, 50% for %MMA, and 59% for %DMA. After adjustment for sex, age, smoking, body mass index, alcohol consumption, region, and total urine arsenic concentrations, LOD [logarithm (to the base of 10) of the odds] scores indicated suggestive evidence for genetic linkage with QTLs influencing urine arsenic metabolites on chromosomes 5 (LOD = 2.03 for %iAs), 9 (LOD = 2.05 for %iAs and 2.10 for %MMA), and 11 (LOD = 1.94 for %iAs). A peak for %DMA on chromosome 10 within 2 Mb of AS3MT had an LOD of 1.80. CONCLUSIONS This population-based family study in American Indian communities supports a genetic contribution to variation in the distribution of arsenic metabolites in urine and, potentially, the involvement of genes other than AS3MT.
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Affiliation(s)
- Maria Tellez-Plaza
- Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
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Hossain MB, Vahter M, Concha G, Broberg K. Environmental arsenic exposure and DNA methylation of the tumor suppressor gene p16 and the DNA repair gene MLH1: effect of arsenic metabolism and genotype. Metallomics 2012; 4:1167-75. [PMID: 23073540 DOI: 10.1039/c2mt20120h] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Arsenic is carcinogenic, possibly partly through epigenetic mechanisms. We evaluated the effects of arsenic exposure and metabolism on DNA methylation. Arsenic exposure and methylation efficiency in 202 women in the Argentinean Andes were assessed from concentrations of arsenic metabolites in urine (inorganic arsenic, methylarsonic acid [MMA], and dimethylarsinic acid [DMA]), measured by HPLC-ICPMS. Methylation of CpGs of the tumor suppressor gene p16, the DNA repair gene MLH1, and the repetitive elements LINE1 was measured by PCR pyrosequencing of blood DNA. Genotyping (N = 172) for AS3MT was performed using Sequenom™, and gene expression (N = 90) using Illumina DirectHyb HumanHT-12 v3.0. Median arsenic concentration in urine was 230 μg L(-1) (range 10.1-1251). In linear regression analysis, log(2)-transformed urinary arsenic concentrations were positively associated with methylation of p16 (β = 0.14, P = 0.0028) and MLH1 (β = 0.28, P = 0.0011), but not with LINE1. Arsenic concentrations were of borderline significance negatively correlated with expression of p16 (r(s) = -0.20; P = 0.066)), but not with MLH1. The fraction of inorganic arsenic was positively (β = 0.026; P = 0.010) and DMA was negatively (β = -0.017, P = 0.043) associated with p16 methylation with no effect of MMA. Carriers of the slow-metabolizing AS3MT haplotype were associated with more p16 methylation (P = 0.022). Arsenic exposure was correlated with increased methylation, in blood, of genes encoding enzymes that suppress carcinogenesis, and the arsenic metabolism efficiency modified the degree of epigenetic alterations.
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Affiliation(s)
- Mohammad Bakhtiar Hossain
- Department of Laboratory Medicine, Division of Occupational and Environmental Medicine, Lund University, Lund, SE-22185, Sweden
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Delineating the degree of association between biomarkers of arsenic exposure and type-2 diabetes mellitus. Int J Hyg Environ Health 2012; 216:35-49. [PMID: 22920650 DOI: 10.1016/j.ijheh.2012.07.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2011] [Revised: 07/01/2012] [Accepted: 07/04/2012] [Indexed: 01/18/2023]
Abstract
Non-carcinogenic effects in low-level (< 100 μgL(-1)) arsenic (As)-impacted populations, such as the development and progression of type-2 diabetes mellitus (T2DM), are often neglected given the primary emphasis of public health authorities on As carcinogenicity. We gathered studies reporting urinary biomarkers of As exposure (U-As) and biomarkers associated with T2DM and its complications (U-T2DM), such as renal damage, oxidation stress, low-grade inflammation, and endothelial damage. Studied U-T2DM biomarkers were: 8-hydroxy-2'deoxyguanosine, N-acetyl-β-d-glucosaminidase, β2-microglobulin, and albumin. Data was expressed as: either arithmetic means and standard deviations, or geometric means and geometric standard deviations, or correlation coefficients of U-As and U-T2DM. Urinary As concentrations were consistently associated with the aforementioned biomarkers of T2DM pathologic complications. Despite the limited selectivity of the selected T2DM biomarkers, a per unit change in As exposure level was reflected in the corresponding T2DM biomarker urinary concentrations. Our systematic review provides new evidence on the role of environmental As exposures influencing the T2DM disease process. Additional epidemiologic studies onto the association between As and T2DM should incorporate both urinary As and T2DM biomarkers, as suggested in this study, in order to evaluate subclinical effects of low-level As exposures.
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McClintock TR, Chen Y, Bundschuh J, Oliver JT, Navoni J, Olmos V, Lepori EV, Ahsan H, Parvez F. Arsenic exposure in Latin America: biomarkers, risk assessments and related health effects. THE SCIENCE OF THE TOTAL ENVIRONMENT 2012; 429:76-91. [PMID: 22119448 PMCID: PMC3977337 DOI: 10.1016/j.scitotenv.2011.08.051] [Citation(s) in RCA: 99] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2010] [Revised: 08/08/2011] [Accepted: 08/10/2011] [Indexed: 05/19/2023]
Abstract
In Latin America, several regions have a long history of widespread arsenic (As) contamination from both natural and anthropological sources. Yet, relatively little is known about the extent of As exposure from drinking water and its related health consequences in these countries. It has been estimated that at least 4.5 million people in Latin America are chronically exposed to high levels of As (>50 μg/L), some to as high as 2000 μg/L--200 times higher than the World Health Organization (WHO) provisional standard for drinking water. We conducted a systematic review of 82 peer reviewed papers and reports to fully explore the current understanding of As exposure and its health effects, as well as the influence of genetic factors that modulate those effects in the populations of Latin America. Despite some methodological limitations, these studies suggested important links between the high levels of chronic As exposure and elevated risks of numerous adverse health outcomes in Latin America--including internal and external cancers, reproductive outcomes, and childhood cognitive function. Several studies demonstrated genetic polymorphisms that influence susceptibility to these and other disease states through their modulation of As metabolism, with As methyltransferase (AS3MT), glutathione S-transferase (GST), and genes of one-carbon metabolism being specifically implicated. While the full extent and nature of the health burden are yet to be known in Latin America, these studies have significantly enriched knowledge of As toxicity and led to subsequent research. Targeted future studies will not only yield a better understanding of the public health impact of As in Latin America populations, but also allow for effective and timely mitigation efforts.
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Affiliation(s)
- Tyler R. McClintock
- New York University School of Medicine, New York University, New York, NY, USA
| | - Yu Chen
- Department of Environmental Medicine, New York University, New York, NY, USA
| | - Jochen Bundschuh
- Institute of Applied Research, Karlsruhe University of Applied Sciences, Moltkestrasse 30, 76133 Karlsruhe, Germany
- Department of Earth Sciences, National Cheng Kung University, University Road, Tainan City 701, Taiwan
| | - John T. Oliver
- Columbia University Medical Center, Hammer Health Sciences Center, New York, NY, USA
| | - Julio Navoni
- Cátedra de Toxicología y Química Legal- Facultad de Farmacia y Bioquímica. Universidad de Buenos Aires. Junín 956- piso 7, 1113 Buenos Aires, Argentina
| | - Valentina Olmos
- Cátedra de Toxicología y Química Legal- Facultad de Farmacia y Bioquímica. Universidad de Buenos Aires. Junín 956- piso 7, 1113 Buenos Aires, Argentina
| | - Edda Villaamil Lepori
- Cátedra de Toxicología y Química Legal- Facultad de Farmacia y Bioquímica. Universidad de Buenos Aires. Junín 956- piso 7, 1113 Buenos Aires, Argentina
| | - Habibul Ahsan
- Departments of Medicine and Human Genetics and Cancer Research Center, The University of Chicago, Chicago, IL, USA
- Department of Health Studies, The University of Chicago, Chicago, IL, USA
| | - Faruque Parvez
- Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University, New York, NY, USA
- Address for correspondence and reprints: Faruque Parvez, Department of Environmental Health Sciences, 60 Haven Ave, B-1, New York, NY 10032. Phone / Fax: 212-305-4101/ 212-305-3857,
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Hossain MB, Vahter M, Concha G, Broberg K. Low-level environmental cadmium exposure is associated with DNA hypomethylation in Argentinean women. ENVIRONMENTAL HEALTH PERSPECTIVES 2012; 120:879-84. [PMID: 22382075 PMCID: PMC3385444 DOI: 10.1289/ehp.1104600] [Citation(s) in RCA: 89] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2011] [Accepted: 03/01/2012] [Indexed: 05/11/2023]
Abstract
BACKGROUND Cadmium, a common food pollutant, alters DNA methylation in vitro. Epigenetic effects might therefore partly explain cadmium's toxicity, including its carcinogenicity; however, human data on epigenetic effects are lacking. OBJECTIVE We evaluated the effects of dietary cadmium exposure on DNA methylation, considering other environmental exposures, genetic predisposition, and gene expression. METHODS Concentrations of cadmium, arsenic, selenium, and zinc in blood and urine of nonsmoking women (n = 202) from the northern Argentinean Andes were measured by inductively coupled mass spectrometry. Methylation in CpG islands of LINE-1 (long interspersed nuclear element-1; a proxy for global DNA methylation) and promoter regions of p16 [cyclin-dependent kinase inhibitor 2A (CDKN2A)] and MLH1 (mutL homolog 1) in peripheral blood were measured by bisulfite polymerase chain reaction pyrosequencing. Genotyping (n = 172) for the DNA (cytosine-5-)-methyltransferase 1 gene (DNMT1 rs10854076 and rs2228611) and DNA (cytosine-5-)-methyltransferase 3 beta gene (DNMT3B rs2424913 and rs2424932) was performed with Sequenom iPLEX GOLD SNP genotyping; and gene expression (n = 90), with DirectHyb HumanHT-12 (version 3.0). RESULTS Cadmium exposure was low: median concentrations in blood and urine were 0.36 and 0.23 µg/L, respectively. Urinary cadmium (natural log transformed) was inversely associated with LINE-1 methylation (β = -0.50, p = 0.0070; β = -0.44, p = 0.026, adjusted for age and coca chewing) but not with p16 or MLH1 methylation. Both DNMT1 rs10854076 and DNMT1 rs2228611 polymorphisms modified associations between urinary cadmium and LINE-1 (p-values for interaction in adjusted models were 0.045 and 0.064, respectively). The rare genotypes demonstrated stronger hypomethylation with increasing urinary cadmium concentrations. Cadmium was inversely associated with DNMT3B (r(S) = -0.28, p = 0.0086) but not with DNMT1 expression (r(S) = -0.075, p = 0.48). CONCLUSION Environmental cadmium exposure was associated with DNA hypomethylation in peripheral blood, and DNMT1 genotypes modified this association. The role of epigenetic modifications in cadmium-associated diseases needs clarification.
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Affiliation(s)
- Mohammad Bakhtiar Hossain
- Department of Laboratory Medicine, Division of Occupational and Environmental Medicine, Lund University, Lund, Sweden
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Gomez-Rubio P, Klimentidis YC, Cantu-Soto E, Meza-Montenegro MM, Billheimer D, Lu Z, Chen Z, Klimecki WT. Indigenous American ancestry is associated with arsenic methylation efficiency in an admixed population of northwest Mexico. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2012; 75:36-49. [PMID: 22047162 PMCID: PMC3572940 DOI: 10.1080/15287394.2011.615107] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Many studies provide evidence relating lower human arsenic (As) methylation efficiency, represented by high percent urinary monomethylarsonic acid (MMA(V)), with several As-induced diseases, possibly due to the fact that MMA(V) serves as a proxy for MMA(III), the most toxic As metabolite. Some epidemiological studies suggested that indigenous Americans (AME) methylate As more efficiently; however, data supporting this have been equivocal. The aim of this study was to characterize the association between AME ancestry and As methylation efficiency using a panel of ancestry informative genetic markers to determine individual ancestry proportions in an admixed population (composed of two or more isolated ancestral populations) of 746 individuals environmentally exposed to As in northwest Mexico. Total urinary As (TAs) mean and range were 170.4 and 2.3-1053.5 μg/L, while percent AME (%AME) mean and range were 72.4 and 23-100. Adjusted (gender, age, AS3MT 7388/M287T haplotypes, body mass index [BMI], and TAs) multiple regression model showed that higher AME ancestry is significantly associated with lower percentage of urinary As excreted as MMA(V) (%uMMA) in this population (p < .01). Data also demonstrated a significant interaction between BMI and gender, indicating negative association between BMI and %uMMA, stronger in women than men (p < .01). Moreover, age and the AS3MT variants 7388 (intronic) and M287T (nonsynonymous) were also significantly associated with As methylation efficiency (p < .01). This study highlights the importance of BMI and indigenous American ancestry in some of the observed variability in As methylation efficiency, underscoring the need to be considered in epidemiology studies, particularly those carried out in admixed populations.
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Affiliation(s)
- Paulina Gomez-Rubio
- Department of Pharmacology and Toxicology, University of Arizona, Tucson, Arizona
| | - Yann C. Klimentidis
- Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama
| | - Ernesto Cantu-Soto
- Department of Environmental Sciences, Instituto Tecnologico de Sonora, Ciudad Obregon, Sonora, Mexico
| | - Maria M. Meza-Montenegro
- Department of Environmental Sciences, Instituto Tecnologico de Sonora, Ciudad Obregon, Sonora, Mexico
| | - Dean Billheimer
- Department of Agricultural and Biosystems Engineering, University of Arizona, Tucson, Arizona
| | - Zhenqiang Lu
- Arizona Statistical Consulting Laboratory, University of Arizona, Tucson, Arizona
| | - Zhao Chen
- Division of Epidemiology and Biostatistics, Mel and Enid Zuckerman College of Public Health, University of Arizona, Tucson, Arizona
| | - Walter T. Klimecki
- Department of Pharmacology and Toxicology, University of Arizona, Tucson, Arizona
- To whom correspondence should be addressed: Walter Klimecki, DVM, Ph.D., 1657 E Helen St, RM319, Thomas Keating Bldg. Tucson, AZ 85721, Tel. 520-626-7470, Fax. 520-626-2466,
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Kippler M, Hossain MB, Lindh C, Moore SE, Kabir I, Vahter M, Broberg K. Early life low-level cadmium exposure is positively associated with increased oxidative stress. ENVIRONMENTAL RESEARCH 2012; 112:164-70. [PMID: 22192840 DOI: 10.1016/j.envres.2011.11.012] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2011] [Revised: 11/09/2011] [Accepted: 11/28/2011] [Indexed: 05/04/2023]
Abstract
Environmental exposure to cadmium (Cd) is known to induce oxidative stress, a state of imbalance between the production of reactive oxygen species (ROS) and the ability to detoxify them, in adults. However, data are lacking on potential effects in early-life. We evaluated urinary concentrations of 8-oxo-7,8-dihydro-2'-deoxyguanosine (8-oxodG), a recognized marker of oxidative DNA damage, in relation to Cd exposure in 96 predominantly breast-fed infants (11-17 weeks of age) in rural Bangladesh. Urinary 8-oxodG was measured using liquid chromatography tandem mass spectrometry and Cd in urine and breast milk by inductively coupled plasma mass spectrometry. Median concentration of 8-oxodG was 3.9 nmol/L, urinary Cd 0.30 μg/L, and breast-milk Cd 0.13 μg/L. In linear regression analyses, urinary 8-oxodG was positively associated with Cd in both urine (p=0.00067) and breast milk (p=0.0021), and negatively associated with body weight (kg; p=0.0041). Adjustment for age, body weight, socio-economic status, urinary arsenic, as well as magnesium, calcium, and copper in breast milk did not change the association between Cd exposure and urinary 8-oxodG. These findings suggest that early-life low-level exposure to Cd via breast milk induces oxidative stress. Further studies are warranted to elucidate whether this oxidative stress is associated with impaired child health and development.
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Affiliation(s)
- Maria Kippler
- Institute of Environmental Medicine, Karolinska Institutet, Box 210, SE-171 77 Stockholm, Sweden
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