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Mani MS, Dsouza VL, Dsouza HS. Evaluation of divalent metal transporter 1 (DMT1) (rs224589) polymorphism on blood lead levels of occupationally exposed individuals. Toxicol Lett 2021; 353:13-19. [PMID: 34626817 DOI: 10.1016/j.toxlet.2021.10.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Revised: 08/15/2021] [Accepted: 10/04/2021] [Indexed: 01/28/2023]
Abstract
Lead (Pb) is an environmental and public health toxicant. It affects various organ systems of the body, thereby disrupting their normal functions. To date, several genes that are known to influence the mechanism of action of lead and toxicity have been studied. Among them, the iron transporter gene, SLC11A2 (Solute Carrier 11 group A member 2) which codes for the transmembrane protein, DMT1 (Divalent Metal Transporter 1) has shown to transport other metals including zinc, copper, and lead. We investigated the influence of DMT1 polymorphism (rs224589) on blood lead (Pb-B) levels. In the present study, we enrolled 113 lead-exposed workers and performed a comprehensive biochemical analysis and genetic composition. The frequency of DMT1 variants observed in the total subjects (n = 113) was 42 % for homozygous CC wild type, 54 % for heterozygous CA, and 4 % for homozygous AA mutant. The heterozygous CA carriers presented higher Pb-B levels compared to wild type CC and mutant AA carriers. Further, a negative association was observed between Pb-B levels and hemoglobin in heterozygous CA carriers. Hence, C allele may be the risk allele that contributes to increased susceptibility to high Pb-B retention, and genotyping of DMT1 in lead exposed subjects might be used as a prognostic marker to impede organ damage due to lead toxicity.
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Affiliation(s)
- Monica Shirley Mani
- Department of Radiation Biology and Toxicology, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, India.
| | - Venzil Lavie Dsouza
- Department of Radiation Biology and Toxicology, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, India.
| | - Herman Sunil Dsouza
- Department of Radiation Biology and Toxicology, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, India.
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Qing Y, Yang J, Zhang Q, Zhu Y, Ruiz P, Wu M, Zhao G, Zhao Q, Liu H, Cai H, Qin L, Zheng W, He G. Bayesian toxicokinetic modeling of cadmium exposure in Chinese population. JOURNAL OF HAZARDOUS MATERIALS 2021; 413:125465. [PMID: 33930974 DOI: 10.1016/j.jhazmat.2021.125465] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Revised: 02/16/2021] [Accepted: 02/17/2021] [Indexed: 06/12/2023]
Abstract
Cadmium (Cd) is a toxic heavy metal widely present in the environment. Estimating its internal levels for a given external exposure using toxicokinetic (TK) models is key to the human health risk assessment of Cd. In this study, existing Cd TK models were adapted to develop a one-compartment TK model and a multi-compartment physiologically based toxicokinetic (PBTK) model by estimating the characteristics of Cd kinetics based on Cd exposure data from 814 Chinese residents. Both models not only considered the effect of gender difference on Cd kinetics, but also described the model parameters in terms of distributions to reflect individual variability. For both models, the posterior distributions of sensitive parameters were estimated using the Markov chain-Monte Carlo method (MCMC) and the approximate Bayesian computation-MCMC algorithm (ABC-MCMC). Validation with the test dataset showed 1.4-22.5% improvement in the root mean square error (RMSE) over the original models. After a systematic literature search, the optimized models showed acceptable prediction on other Chinese datasets. The study provides a method for parameter optimization of TK models under different exposure environment, and the validated models can serve as new quantitative assessment tools for the risk assessment of Cd in the Chinese population.
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Affiliation(s)
- Ying Qing
- School of Public Health/Key Laboratory of Public Health Safety, Ministry of Education, Department of Nutrition and food science, Fudan University, Shanghai 200032, China
| | - Jiaqi Yang
- School of Public Health/Key Laboratory of Public Health Safety, Ministry of Education, Department of Nutrition and food science, Fudan University, Shanghai 200032, China
| | - Qiang Zhang
- Gangarosa Department of Environmental Health, Rollins School of Public Health, Emory University, Atlanta, GA 30322, USA
| | - Yuanshen Zhu
- School of Public Health/Key Laboratory of Public Health Safety, Ministry of Education, Department of Nutrition and food science, Fudan University, Shanghai 200032, China
| | - Patricia Ruiz
- Agency for Toxic Substances and Disease Registry, Atlanta, GA, USA
| | - Min Wu
- School of Public Health/Key Laboratory of Public Health Safety, Ministry of Education, Department of Nutrition and food science, Fudan University, Shanghai 200032, China
| | - Genming Zhao
- Department of Epidemiology and Biostatistics, School of Public Health, Fudan University, Shanghai, China
| | - Qi Zhao
- Department of Epidemiology and Biostatistics, School of Public Health, Fudan University, Shanghai, China
| | - Hong Liu
- Shanghai Municipal Center for Disease Control and Prevention, Shanghai 200336, China
| | - Hua Cai
- Shanghai Municipal Center for Disease Control and Prevention, Shanghai 200336, China
| | - Luxin Qin
- Shanghai Municipal Center for Disease Control and Prevention, Shanghai 200336, China
| | - Weiwei Zheng
- Key Laboratory of Public Health Safety, Ministry of Education, Department of Environmental Health, School of Public Health, Fudan University, Shanghai 200032, China; Key Laboratory of Health Technology Assessment, National Health Commission of the People's Republic of China, Fudan University, Shanghai 200032, China.
| | - Gengsheng He
- School of Public Health/Key Laboratory of Public Health Safety, Ministry of Education, Department of Nutrition and food science, Fudan University, Shanghai 200032, China.
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Exploring persistent racial/ethnic disparities in lead exposure among American children aged 1-5 years: results from NHANES 1999-2016. Int Arch Occup Environ Health 2021; 94:723-730. [PMID: 33394180 DOI: 10.1007/s00420-020-01616-4] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Accepted: 11/16/2020] [Indexed: 12/21/2022]
Abstract
OBJECTIVE The aim of this study was to determine whether long-standing racial disparities in lead exposure still exists for children age 1-5 years old. We examined if blood lead levels were higher among non-Hispanic Black children and others compared to non-Hispanic White children. METHODS Data from the National Health and Nutrition Examination Survey (NHANES) from 1999-2016 were used. Geometric mean blood lead levels (BLLs) were compared by race/ethnicity using log-transformed simple linear regression. Associations between race and elevated BLL were assessed using weighted Chi-square tests. Log-transformed multiple weighted linear regression was used to assess what factors affected BLLs. RESULTS A total of 6772 children were included in this study. In 1999-2000, the geometric mean BLL for non-Hispanic Black children was 3.08 μg/dL, compared to 2.03 μg/dL for non-Hispanic White children (p = 0.01). The difference in geometric mean BLL between non-Hispanic Black children and non-Hispanic White children continued to be statistically significant in later years (all p < 0.05) until 2015-2016 (0.89 μg/dL vs 0.74 μg/dL, p = 0.17). Log-transformed linear regression showed that being non-Hispanic Black and having low family income were independently associated with higher BLL. CONCLUSION Although lead exposure in the general population continued to decline for all racial/ethnic groups, non-Hispanic Black children still had higher BLL than non-Hispanic White children. In more recent years, the racial/ethnic gap was lesser but persisted. Racial/ethnic disparity in childhood BLL could be partially explained by socio-economic factors.
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Mani MS, Kabekkodu SP, Joshi MB, Dsouza HS. Ecogenetics of lead toxicity and its influence on risk assessment. Hum Exp Toxicol 2019; 38:1031-1059. [PMID: 31117811 DOI: 10.1177/0960327119851253] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/02/2024]
Abstract
Lead (Pb) toxicity is a public health problem affecting millions worldwide. Advances in 'omic' technology have paved the way to toxico-genomics which is currently revolutionizing the understanding of interindividual variations in susceptibility to Pb toxicity and its functional consequences to exposure. Our objective was to identify, comprehensively analyze, and curate all the potential genetic and epigenetic biomarkers studied to date in relation to Pb toxicity and its association with diseases. We screened a volume of research articles that focused on Pb toxicity and its association with genetic and epigenetic signatures in the perspective of occupational and environmental Pb exposure. Due to wide variations in population size, ethnicity, age-groups, and source of exposure in different studies, researchers continue to be skeptical on the topic of the influence of genetic variations in Pb toxicity. However, surface knowledge of the underlying genetic factors will aid in elucidating the mechanism of action of Pb. Moreover, in recent years, the application of epigenetics in Pb toxicity has become a promising area in toxicology to understand the influence of epigenetic mechanisms such as DNA methylation, chromatin remodeling, and small RNAs for the regulation of genes in response to Pb exposure during early life. Growing evidences of ecogenetic understanding (both genetic and epigenetic processes) in a dose-dependent manner may help uncover the mechanism of action of Pb and in the identification of susceptible groups. Such studies will further help in refining uncertainty factors and in addressing risk assessment of Pb poisoning.
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Affiliation(s)
- M S Mani
- 1 Department of Radiation Biology and Toxicology, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, India
| | - S P Kabekkodu
- 2 Department of Cellular and Molecular Biology, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, India
| | - M B Joshi
- 3 Department of Ageing, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, India
| | - H S Dsouza
- 1 Department of Radiation Biology and Toxicology, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, India
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Ngueta G. Assessing the Influence of Age and Ethnicity on the Association Between Iron Status and Lead Concentration in Blood: Results from the Canadian Health Measures Survey (2007-2011). Biol Trace Elem Res 2016; 171:301-307. [PMID: 26519423 DOI: 10.1007/s12011-015-0547-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/03/2015] [Accepted: 10/18/2015] [Indexed: 10/22/2022]
Abstract
Inverse association has been reported between iron intake and blood lead concentration (PbB) in epidemiological studies. Data on this association at a low dose of lead exposure are scarce, and the potential influence of ethnicity and age has not been previously reported. This study aimed to estimate the relation between serum ferritin, haemoglobin, haematocrit, and mean corpuscular volume and PbB among 6-18-year-old individuals. Data from Canadian Health and Measures Survey (CHMS), cycle 1 (2007-2009) and cycle 2 (2009-2011), were accessed. A household interview followed by a physical examination (including collection of blood) was performed. The quantification of lead and trace elements in blood was performed by inductively coupled plasma mass spectrometry. The mean PbB was 0.79 μg/dL (95 % confidence interval (95 % CI) 0.75-0.82). Except for haemoglobin levels, no association was found between PbB and any of the parameters of iron status, independently of age. A significant interaction was observed between ferritin levels and ethnicity in relation to PbB (p = 0.07). We found a little evidence of an association between iron status and PbB in the whole sample of subjects aged 6-18 years exposed to low levels of environmental lead. The significant interaction observed between ferritin levels and ethnicity in relation to BPb suggests that the influence of ferritin levels on lead uptake may change by ethnicity, even at low exposure.
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Affiliation(s)
- Gerard Ngueta
- Population Health and Optimal Health Practices Research Unit, CHUQ Research Center, Faculty of Medicine, Laval University, 2875 Bld Laurier, Delta II (Floor 6), Quebec, QC, G1V 2M2, Canada.
- Department of Occupational and Environmental Health, School of Public Health, Université de Montréal, Montreal, H3T 1A8, QC, Canada.
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Ettinger AS, Bovet P, Plange-Rhule J, Forrester TE, Lambert EV, Lupoli N, Shine J, Dugas LR, Shoham D, Durazo-Arvizu RA, Cooper RS, Luke A. Distribution of metals exposure and associations with cardiometabolic risk factors in the "Modeling the Epidemiologic Transition Study". Environ Health 2014; 13:90. [PMID: 25374160 PMCID: PMC4240881 DOI: 10.1186/1476-069x-13-90] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2014] [Accepted: 10/22/2014] [Indexed: 05/04/2023]
Abstract
BACKGROUND Metals are known endocrine disruptors and have been linked to cardiometabolic diseases via multiple potential mechanisms, yet few human studies have both the exposure variability and biologically-relevant phenotype data available. We sought to examine the distribution of metals exposure and potential associations with cardiometabolic risk factors in the "Modeling the Epidemiologic Transition Study" (METS), a prospective cohort study designed to assess energy balance and change in body weight, diabetes and cardiovascular disease risk in five countries at different stages of social and economic development. METHODS Young adults (25-45 years) of African descent were enrolled (N = 500 from each site) in: Ghana, South Africa, Seychelles, Jamaica and the U.S.A. We randomly selected 150 blood samples (N = 30 from each site) to determine concentrations of selected metals (arsenic, cadmium, lead, mercury) in a subset of participants at baseline and to examine associations with cardiometabolic risk factors. RESULTS Median (interquartile range) metal concentrations (μg/L) were: arsenic 8.5 (7.7); cadmium 0.01 (0.8); lead 16.6 (16.1); and mercury 1.5 (5.0). There were significant differences in metals concentrations by: site location, paid employment status, education, marital status, smoking, alcohol use, and fish intake. After adjusting for these covariates plus age and sex, arsenic (OR 4.1, 95% C.I. 1.2, 14.6) and lead (OR 4.0, 95% C.I. 1.6, 9.6) above the median values were significantly associated with elevated fasting glucose. These associations increased when models were further adjusted for percent body fat: arsenic (OR 5.6, 95% C.I. 1.5, 21.2) and lead (OR 5.0, 95% C.I. 2.0, 12.7). Cadmium and mercury were also related with increased odds of elevated fasting glucose, but the associations were not statistically significant. Arsenic was significantly associated with increased odds of low HDL cholesterol both with (OR 8.0, 95% C.I. 1.8, 35.0) and without (OR 5.9, 95% C.I. 1.5, 23.1) adjustment for percent body fat. CONCLUSIONS While not consistent for all cardiometabolic disease markers, these results are suggestive of potentially important associations between metals exposure and cardiometabolic risk. Future studies will examine these associations in the larger cohort over time.
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Affiliation(s)
- Adrienne S Ettinger
- />Yale Center for Perinatal, Pediatric & Environmental Epidemiology, Department of Chronic Disease Epidemiology, Yale School of Public Health, 1 Church St, New Haven, CT 06510 USA
| | - Pascal Bovet
- />Institute of Social and Preventive Medicine, Lausanne University Hospital, 10, route de la Corniche, Lausanne, CH-1010 Switzerland
- />Unit for the Prevention and Control of Cardiovascular Disease, Ministry of Health, Victoria, Mahe Seychelles
| | - Jacob Plange-Rhule
- />Kwame Nkrumah University of Science and Technology, Kumasi, Ashanti Ghana
- />St George’s, University of London, London, UK
| | - Terrence E Forrester
- />UWI Solutions for Developing Countries, University of the West Indies Mona, 25 West Road, Kingston 7, Jamaica
| | - Estelle V Lambert
- />Research Unit for Exercise Science and Sports Medicine, Division of Health Sciences, University of Cape Town, Cape Town, 7725 South Africa
| | - Nicola Lupoli
- />Department of Environmental Health, Harvard School of Public Health, 677 Huntington Ave, Boston, MA 02115 USA
| | - James Shine
- />Department of Environmental Health, Harvard School of Public Health, 677 Huntington Ave, Boston, MA 02115 USA
| | - Lara R Dugas
- />Department of Public Health Sciences, Stritch School of Medicine, Loyola University Chicago, 2160 S. First Ave, Maywood, IL 60153 USA
| | - David Shoham
- />Department of Public Health Sciences, Stritch School of Medicine, Loyola University Chicago, 2160 S. First Ave, Maywood, IL 60153 USA
| | - Ramon A Durazo-Arvizu
- />Department of Public Health Sciences, Stritch School of Medicine, Loyola University Chicago, 2160 S. First Ave, Maywood, IL 60153 USA
| | - Richard S Cooper
- />Department of Public Health Sciences, Stritch School of Medicine, Loyola University Chicago, 2160 S. First Ave, Maywood, IL 60153 USA
| | - Amy Luke
- />Department of Public Health Sciences, Stritch School of Medicine, Loyola University Chicago, 2160 S. First Ave, Maywood, IL 60153 USA
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