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Vaiopoulou E, Gikas P. Regulations for chromium emissions to the aquatic environment in Europe and elsewhere. CHEMOSPHERE 2020; 254:126876. [PMID: 32957286 DOI: 10.1016/j.chemosphere.2020.126876] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Revised: 04/20/2020] [Accepted: 04/21/2020] [Indexed: 05/26/2023]
Abstract
Chromium is a controversial element, since it has been classified as essential trace element, to chemically and biologically inert compound, to potent intoxicator. Concerns have been risen for chromium effects on human and aquatic life because chromium has been accused for genotoxicity and carcinogenesis. Metals and their ions or complexes (and thus chromium substances) are included in the indicative list of main pollutants (Annex VIII of the Water Framework Directive (2000/60/EC)). Biological effects of chromium are strongly depended on chromium speciation. No universal CrIII or CrVI discharge limits to the aquatic environment have been suggested by the EU. International bodies within the EU, such as the Helsinki Commission and the Oslo-Paris Convention, have issued recommendations on chromium discharge levels. National CrVI and CrIII discharge limits vary in each EU Member State with respect to the receiving water body (marine water, lake, river, sewer system). The maximum discharge limit to the aquatic environment in EU is 1 and 5 mg L-1 for CrVI and Crtotal, respectively. The present work summarizes EU legislation, with respect to the discharge limits to the aquatic environment for CrVI and CrIII. EU national limits that are currently effective are presented and compared to the limits in other parts of the world, such as Australia, Asia, USA, Latin America and South Africa. It is wise that future perspective of chromium policy should differentiate between CrIII and CrVI discharge limits to the aquatic environment, as analytical techniques become more sensitive and chromium speciation specific, and environmental awareness rises.
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Affiliation(s)
- Eleni Vaiopoulou
- Concawe, Environmental Science for the European Refining Industry, Boulevard Du Souverain 165, 1160, Brussels, Belgium.
| | - Petros Gikas
- Design of Environmental Processes Laboratory, School of Environmental Engineering, Technical University of Crete, 73100, Chania, Greece.
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2
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Yuan W, Xu W, Zhang Z, Wang X, Zhang Q, Bai J, Wang J. Rapid Cr(VI) reduction and immobilization in contaminated soil by mechanochemical treatment with calcium polysulfide. CHEMOSPHERE 2019; 227:657-661. [PMID: 31015086 DOI: 10.1016/j.chemosphere.2019.04.108] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Revised: 04/10/2019] [Accepted: 04/14/2019] [Indexed: 06/09/2023]
Abstract
Mechanochemical treatment with calcium polysulfide (CPS) was applied to remediate the Cr(VI) contaminated soil. The effects of parameters including milling speed, milling time, ball to powder ratio (BPR) and dosage of CPS were investigated. The effectiveness of mechanical treatment with or without CPS is estimated by analyzing the leachable fraction of Cr(VI). The results show that mechanochemical treatment with CPS can decrease and immobilize Cr in soil more quickly and efficiently with comparison to the case without additive. Under a milling speed of 500 rpm, milling time of 2 h, BPR of 9 and CPS dosage of 3%, the Cr(VI) leaching concentration significantly decreased from 115 mg L-1 to 0.51 mg L-1, much lower than the regulatory limit of 5 mg L-1. Additionally, XPS results demonstrated that Cr(VI) can be converted into Cr(III) during ball milling with CPS. The high Cr(VI) removal and Cr immobilization capacity makes mechanochemical treatment a great potential in field remediation.
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Affiliation(s)
- Wenyi Yuan
- Shanghai Collaborative Innovation Centre for WEEE Recycling, Shanghai Polytechnic University, Shanghai, 201209, China; Research Center of Resource Recycling Science and Engineering, Shanghai Polytechnic University, Shanghai, 201209, China.
| | - Weitong Xu
- School of Environmental and Materials Engineering, Shanghai Polytechnic University, Shanghai, 201209, China.
| | - Ziwei Zhang
- School of Environmental and Materials Engineering, Shanghai Polytechnic University, Shanghai, 201209, China.
| | - Xiaoyan Wang
- School of Environmental and Materials Engineering, Shanghai Polytechnic University, Shanghai, 201209, China.
| | - Qiwu Zhang
- School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, Hubei, 430070, China.
| | - Jianfeng Bai
- Shanghai Collaborative Innovation Centre for WEEE Recycling, Shanghai Polytechnic University, Shanghai, 201209, China; Research Center of Resource Recycling Science and Engineering, Shanghai Polytechnic University, Shanghai, 201209, China.
| | - Jingwei Wang
- Shanghai Collaborative Innovation Centre for WEEE Recycling, Shanghai Polytechnic University, Shanghai, 201209, China; Research Center of Resource Recycling Science and Engineering, Shanghai Polytechnic University, Shanghai, 201209, China.
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Samavarchi Tehrani S, Mahmoodzadeh Hosseini H, Yousefi T, Abolghasemi M, Qujeq D, Maniati M, Amani J. The crosstalk between trace elements with DNA damage response, repair, and oxidative stress in cancer. J Cell Biochem 2019; 120:1080-1105. [PMID: 30378148 DOI: 10.1002/jcb.27617] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Accepted: 08/14/2018] [Indexed: 01/24/2023]
Abstract
DNA damage response (DDR) is a regulatory system responsible for maintaining genome integrity and stability, which can sense and transduce DNA damage signals. The severity of damage appears to determine DDRs, which can include damage repair, cell-cycle arrest, and apoptosis. Furthermore, defective components in DNA damage and repair machinery are an underlying cause for the development and progression of various types of cancers. Increasing evidence indicates that there is an association between trace elements and DDR/repair mechanisms. In fact, trace elements seem to affect mediators of DDR. Besides, it has been revealed that oxidative stress (OS) and trace elements are associated with cancer development. In this review, we discuss the role of some critical trace elements in the risk of cancer. In addition, we provide a brief introduction on DDR and OS in cancer. Finally, we will further review the interactions between some important trace elements including selenium, zinc, chromium, cadmium, and arsenic, and DDR, and OS in cancer.
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Affiliation(s)
- Sadra Samavarchi Tehrani
- Applied Microbiology Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Hamideh Mahmoodzadeh Hosseini
- Applied Microbiology Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Tooba Yousefi
- Student Research Committee, Babol University of Medical Sciences, Babol, Iran
| | - Maryam Abolghasemi
- Student Research Committee, Babol University of Medical Sciences, Babol, Iran
| | - Durdi Qujeq
- Department of Clinical Biochemistry, Babol University of Medical Sciences, Babol, Iran
| | - Mahmood Maniati
- English Department, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - Jafar Amani
- Applied Microbiology Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran
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Zhang J, Cavallari JM, Fang SC, Weisskopf MG, Lin X, Mittleman MA, Christiani DC. Application of linear mixed-effects model with LASSO to identify metal components associated with cardiac autonomic responses among welders: a repeated measures study. Occup Environ Med 2017; 74:810-815. [PMID: 28663305 PMCID: PMC5740538 DOI: 10.1136/oemed-2016-104067] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2016] [Revised: 04/07/2017] [Accepted: 05/10/2017] [Indexed: 11/21/2022]
Abstract
Background Environmental and occupational exposure to metals is ubiquitous worldwide, and understanding the hazardous metal components in this complex mixture is essential for environmental and occupational regulations. Objective To identify hazardous components from metal mixtures that are associated with alterations in cardiac autonomic responses. Methods Urinary concentrations of 16 types of metals were examined and ‘acceleration capacity’ (AC) and ‘deceleration capacity’ (DC), indicators of cardiac autonomic effects, were quantified from ECG recordings among 54 welders. We fitted linear mixed-effects models with least absolute shrinkage and selection operator (LASSO) to identify metal components that are associated with AC and DC. The Bayesian Information Criterion was used as the criterion for model selection procedures. Results Mercury and chromium were selected for DC analysis, whereas mercury, chromium and manganese were selected for AC analysis through the LASSO approach. When we fitted the linear mixed-effects models with ‘selected’ metal components only, the effect of mercury remained significant. Every 1 µg/L increase in urinary mercury was associated with −0.58 ms (−1.03, –0.13) changes in DC and 0.67 ms (0.25, 1.10) changes in AC. Conclusion Our study suggests that exposure to several metals is associated with impaired cardiac autonomic functions. Our findings should be replicated in future studies with larger sample sizes.
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Affiliation(s)
- Jinming Zhang
- Department of Environmental Health, Harvard T H Chan School of Public Health, Boston, USA
| | - Jennifer M Cavallari
- Department of Community Medicine and Health Care, University of Connecticut Health Center, Farmington, USA
| | - Shona C Fang
- Department of Epidemiology, New England Research Institute, Watertown, USA
| | - Marc G Weisskopf
- Department of Epidemiology, Harvard T H Chan School of Public Health, Boston, USA
| | - Xihong Lin
- Department of Biostatistics, Harvard T H Chan School of Public Health, Boston, USA
| | - Murray A Mittleman
- Department of Epidemiology, Harvard T H Chan School of Public Health, Boston, USA.,Cardiovascular Epidemiology Research Unit, Beth Israel Deaconess Medical Center/Harvard Medical School, Boston, USA
| | - David C Christiani
- Department of Environmental Health, Harvard T H Chan School of Public Health, Boston, USA.,Pulmonary and Critical Care Division, Massachusetts General Hospital/Harvard Medical School, Boston, USA
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Wultsch G, Nersesyan A, Kundi M, Mišík M, Setayesh T, Waldherr M, Vodicka P, Vodickova L, Knasmüller S. Genotoxic and Cytotoxic Effects in Exfoliated Buccal and Nasal Cells of Chromium and Cobalt Exposed Electroplaters. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2017; 80:651-660. [PMID: 28524814 DOI: 10.1080/15287394.2017.1286918] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Results of a number of studies indicate that electroplaters have increased cancer risks as a consequence of exposure to genotoxic metals such as chromium (VI) and nickel. These effects may be due to induction of damage of the genetic material which plays a key role in the etiology of cancer, and it was found that workers in galvanization factories exhibited increased levels of DNA damage. The aim of the present study was to investigate genetic stability in workers of a bright plating factory who are exposed to chromium (Cr) and cobalt (Co). Exfoliated cells were collected from the buccal and nasal mucosa of workers (n = 42) and matched controls (n = 43) and analyzed for induction of micronuclei (MN) which are formed as a consequence of chromosomal aberrations. In addition, other nuclear anomalies namely nuclear buds (Nbuds) which are formed as a consequence of gene amplification and markers indicating different stages of cell death (condensed chromatin, karyorrhexis, karyolysis, and pyknosis) were also assessed. No evidence was noted for induction of MN, but significantly increased rates of Nbuds in cells from both, buccal and nasal mucosa, were found. Parameters which are indicative for cytotoxic effects were more pronounced in nasal cells and rose with duration of employment period. Overall, our findings indicated that no apparent chromosomal damage occurred in bright electroplaters. However, data demonstrated that acute cytotoxic effects may lead to inflammations and/or lesions in epithelia of the respiratory tract of the workers.
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Affiliation(s)
- Georg Wultsch
- a Department of Medicine I, Institute of Cancer Research , Medical University of Vienna , Vienna , Austria
| | - Armen Nersesyan
- a Department of Medicine I, Institute of Cancer Research , Medical University of Vienna , Vienna , Austria
| | - Michael Kundi
- b Institute for Environmental Health, Center for Public Health , Medical University of Vienna , Vienna , Austria
| | - Miroslav Mišík
- a Department of Medicine I, Institute of Cancer Research , Medical University of Vienna , Vienna , Austria
| | - Tahereh Setayesh
- a Department of Medicine I, Institute of Cancer Research , Medical University of Vienna , Vienna , Austria
| | - Monika Waldherr
- a Department of Medicine I, Institute of Cancer Research , Medical University of Vienna , Vienna , Austria
| | - Pavel Vodicka
- c Department of Molecular Biology of Cancer, Institute of Experimental Medicine , Academy of Sciences of the Czech Republic , Prague , Czech Republic
| | - Ludmila Vodickova
- c Department of Molecular Biology of Cancer, Institute of Experimental Medicine , Academy of Sciences of the Czech Republic , Prague , Czech Republic
| | - Siegfried Knasmüller
- a Department of Medicine I, Institute of Cancer Research , Medical University of Vienna , Vienna , Austria
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Gardner S, Cline G, Mwebi N, Rayburn J. Developmental and interactive effects of arsenic and chromium to developing Ambystoma maculatum embryos: Toxicity, teratogenicity, and whole-body concentrations. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2017; 80:91-104. [PMID: 28085642 DOI: 10.1080/15287394.2016.1253514] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2016] [Accepted: 10/24/2016] [Indexed: 06/06/2023]
Abstract
Anthropogenic activity has contributed to elevated environmental concentrations of arsenic (As) and chromium (Cr). The spotted salamander, Ambystoma maculatum, may be useful for identifying developmental effects produced by exposure to these contaminants as adults breed and larvae develop in water that may contain As or Cr. Three sample sets among 700 developing larvae were exposed to a range of As, Cr, or 2.5:1 mixture of As:Cr concentrations, respectively. From these 700 larvae, samples containing approximately 24 larvae showed different patterns of whole-body As and Cr from individual and mixture exposure. Whole-body As concentrations were 20.27 and 45.4 µg/g dry weight for larvae exposed to 20 mg/L As and 25:10 mg/L As:Cr, respectively, while whole-body Cr concentrations were 24.8 and 22 µg/g dry weight for larvae exposed to 20 mg/L Cr and 25:10 As:Cr, respectively. Observed malformations included edema, tail kinking, facial deformities, and abnormal bending. Twelve-day lethal concentrations for As and Cr in Ambystoma maculatum larvae were 261.17 mg/L and 71.93 mg/L, respectively, while 12-d effective concentrations to induce malformations were 158.82 and 26.05 mg/L, giving teratogenic indices of 1.64 and 2.76 for individual metal exposure. Exposure to a mixture of As and Cr resulted in a response addition and yielded lower lethal and effective concentration values with a teratogenic index of 2.78, indicating that these contaminants are developmentally toxic at lower concentrations when exposed as a mixture. Data demonstrate that As and Cr affect development of amphibian larvae, and that Ambystoma maculatum may be a useful indicator of environmental toxicity for these metals.
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Affiliation(s)
- Steven Gardner
- a Department of Biology , Jacksonville State University , Jacksonville , Alabama , USA
| | - George Cline
- a Department of Biology , Jacksonville State University , Jacksonville , Alabama , USA
| | - Nixon Mwebi
- b Department of Physical and Earth Science , Jacksonville State University , Jacksonville , Alabama , USA
| | - James Rayburn
- a Department of Biology , Jacksonville State University , Jacksonville , Alabama , USA
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Barbosa F. Toxicology of metals and metalloids: Promising issues for future studies in environmental health and toxicology. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2017; 80:137-144. [PMID: 28277036 DOI: 10.1080/15287394.2016.1259475] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
The function and behavior of chemical elements in ecosystems and in human health probably comprise one of the most studied issues and a theme of great interest and fascination in science. Hot topics are emerging on an annual basis in this field. Bearing this in mind, some promising themes to explore in the field of metals and metalloids in the environment and in toxicology are highlighted and briefly discussed herein.
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Affiliation(s)
- Fernando Barbosa
- a Laboratório de Toxicologia e Essencialidade de Metais, Faculdade de Ciências Farmacêuticas de Ribeirão Preto , Universidade de São Paulo , Ribeirão Preto , SP , Brazil
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Pongpiachan S, Iijima A. Assessment of selected metals in the ambient air PM10 in urban sites of Bangkok (Thailand). ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:2948-2961. [PMID: 26631022 DOI: 10.1007/s11356-015-5877-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2015] [Accepted: 11/24/2015] [Indexed: 06/05/2023]
Abstract
Estimating the atmospheric concentrations of PM10-bounded selected metals in urban air is crucial for evaluating adverse health impacts. In the current study, a combination of measurements and multivariate statistical tools was used to investigate the influence of anthropogenic activities on variations in the contents of 18 metals (i.e., Al, Sc, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Se, Cd, Sb, Ba, La, Ce and Pb) in ambient air. The concentrations of PM10-bounded metals were measured simultaneously at eight air quality observatory sites during a half-year period at heavily trafficked roads and in urban residential zones in Bangkok, Thailand. Although the daily average concentrations of Al, V, Cr, Mn and Fe were almost equivalent to those of other urban cities around the world, the contents of the majority of the selected metals were much lower than the existing ambient air quality guidelines and standard limit values. The sequence of average values of selected metals followed the order of Al > Fe > Zn > Cu > Pb > Mn > Ba > V > Sb > Ni > As > Cr > Cd > Se > Ce > La > Co > Sc. The probability distribution function (PDF) plots showed sharp symmetrical bell-shaped curves in V and Cr, indicating that crustal emissions are the predominant sources of these two elements in PM10. The comparatively low coefficients of divergence (COD) that were found in the majority of samples highlight that site-specific effects are of minor importance. A principal component analysis (PCA) revealed that 37.74, 13.51 and 11.32 % of the total variances represent crustal emissions, vehicular exhausts and the wear and tear of brakes and tires, respectively.
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Affiliation(s)
- Siwatt Pongpiachan
- NIDA Center for Research and Development of Disaster Prevention and Management, School of Social and Environmental Development, National Institute of Development Administration (NIDA), 118 Moo 3, Sereethai Road, Klong-Chan, Bangkapi, Bangkok, 10240, Thailand.
| | - Akihiro Iijima
- Department of Regional Activation, Faculty of Regional Policy, Takasaki City University of Economics, 1300 Kaminamie, Takasaki, Gunma, 370-0801, Japan
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Campos CF, Júnior EODC, Souto HN, Sousa EDF, Pereira BB. Biomonitoring of the environmental genotoxic potential of emissions from a complex of ceramic industries in Monte Carmelo, Minas Gerais, Brazil, using Tradescantia pallida. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2016; 79:123-128. [PMID: 26818189 DOI: 10.1080/15287394.2015.1118714] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The micronucleus (MN) test and analysis of heavy metal biological accumulation in Tradescantia pallida (T. pallida) were bioassays used to assess the genotoxic potential of emissions from a complex of ceramic industries into the atmosphere in a city in Brazil that is considered a national reference source for roof tile production. The ceramic industry emission-exposed T. pallida plants were biomonitored during the dry season, in June, July, and August 2013. In addition to the contaminated monitoring site, a reference site in a peri-urban area was utilized, for comparative purposes. Genotoxicity assessments were determined monthly, while heavy metal bioaccumulation was measured at the end of the total exposure period. The MN frequency was significantly greater in T. pallida plants exposed in the ceramic industry emission monitored area compared to the reference site, and highest MN rates were observed in July and August. With respect to heavy metal bioaccumulation in T. pallida leaves, cadmium (Cd) and chromium (Cr) concentrations were significantly higher in plants at the ceramic industry emission monitoring site. Thus, in relation to the parameters assessed, T. pallida was found to be sensitive to atmospheric contamination by heavy metals attributed to ceramic products emissions generated by the ceramic industry, confirming that this plant species may be employed as a reference organism in biomonitoring studies.
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Affiliation(s)
- Carlos Fernando Campos
- a Federal University of Uberlândia, Department of Genetics and Biochemistry , Laboratory of Cytogenetics and Mutagenesis, Umuarama Campus , Avenida Pará, 1720, 38.400-902 Uberlândia, Minas Gerais , Brazil
| | - Edimar Olegário de Campos Júnior
- a Federal University of Uberlândia, Department of Genetics and Biochemistry , Laboratory of Cytogenetics and Mutagenesis, Umuarama Campus , Avenida Pará, 1720, 38.400-902 Uberlândia, Minas Gerais , Brazil
| | - Henrique Nazareth Souto
- a Federal University of Uberlândia, Department of Genetics and Biochemistry , Laboratory of Cytogenetics and Mutagenesis, Umuarama Campus , Avenida Pará, 1720, 38.400-902 Uberlândia, Minas Gerais , Brazil
| | - Eduardo de Freitas Sousa
- b Fundação Carmelitana Mário Palmério , Department of Biological Sciences , Avenida Brasil Oeste, 38.500-000, Monte Carmelo, Minas Gerais , Brazil
| | - Boscolli Barbosa Pereira
- c Federal University of Uberlândia, Department of Environmental Health , Laboratory of Environmental Health, Santa Monica Campus , Avenida João Naves de Ávila, 2121, 38.408-100, Uberlândia, Minas Gerais , Brazil
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McDermott S, Salzberg DC, Anderson AP, Shaw T, Lead J. Systematic Review of Chromium and Nickel Exposure During Pregnancy and Impact on Child Outcomes. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2015; 78:1348-1368. [PMID: 26571332 DOI: 10.1080/15287394.2015.1090939] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Some forms of chromium (Cr) and nickel (Ni) are toxic, especially with chronic elevated exposure, and certain forms such as hexavalent chromium or nickel carbonyl were labeled as carcinogens. Since both metals are naturally occurring, and used in industrial processes, individuals may be exposed through ingestion of contaminated food or water, inhalation, or dermal contact. This study focused on the impact of toxic forms of Cr and Ni during pregnancy and outcomes in newborn and young children. A systematic literature review following "The Navigation Guide" was applied, and 16 reports that satisfied the inclusion criteria were scored. Six papers studied birth weight, prematurity, or gestational age: one found an association between Ni and small for gestational age, while another linked Ni with low birth weight; however, four reported no marked associations. Of six studies that examined birth defects, three found no significant associations; one noted an association between Ni and neural tube defects; one showed an association between Ni and structural birth defects; and one reported a weak effect for Cr exposure and musculoskeletal defects. In the remaining four studies, weak associations were found for hexavalent Cr and neuroblastoma, Ni and autism spectrum disorder, Cr and Ni and DNA damage, and Cr and lymphocyte damage. Among the studies that were rated as good for execution and reliability, there was weak evidence of an association between Ni and autism spectrum disorder and small for gestational age, but no significant association between Cr and a child outcome.
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Affiliation(s)
| | - Deborah C Salzberg
- a Department of Epidemiology & Biostatistics , University of South Carolina , Columbia , South Carolina , USA
| | - Anna Paige Anderson
- a Department of Epidemiology & Biostatistics , University of South Carolina , Columbia , South Carolina , USA
| | - Timothy Shaw
- b Department of Chemistry & Biochemistry , University of South Carolina , Columbia , South Carolina , USA
| | - Jamie Lead
- c Department of Environmental Health Sciences , University of South Carolina , Columbia , South Carolina , USA
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Pinto MF, Louro H, Costa PM, Caeiro S, Silva MJ. Exploring the potential interference of estuarine sediment contaminants with the DNA repair capacity of human hepatoma cells. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2015; 78:559-570. [PMID: 25965191 DOI: 10.1080/15287394.2015.1006712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Estuaries may be reservoirs of a wide variety of pollutants, including mutagenic and carcinogenic substances that may impact on the ecosystem and human health. A previous study showed that exposure of human hepatoma (HepG2) cells to extracts from sediment samples collected in two areas (urban/industrial and riverine/agricultural) of an impacted estuary (Sado, Portugal), produced differential cytotoxic and genotoxic effects. Those effects were found to be consistent with levels and nature of sediment contamination. The present study aimed at evaluating whether the mixtures of contaminants contained in those extracts were able to modulate DNA repair capacity of HepG2 cells. The residual level of DNA damage was measured by the comet assay in cells exposed for 24 or 48 h to different extracts, after a short preexposure to a challenging concentration range of ethyl methanesulfonate (EMS), as a model alkylating agent. The results suggested that the mixture of contaminants present in the tested samples, besides a potential direct effect on the DNA molecule, may also interfere with DNA repair mechanisms in HepG2 cells, thus impairing their ability to deal with genotoxic stress and, possibly, facilitating accumulation of mutations. Humans are environmentally/occupationally exposed to mixtures rather than to single chemicals. Thus, the observation that estuarine contaminants induce direct and indirect DNA strand breakage in human cells, the latter through the impairment of DNA repair, raises additional concerns regarding potential hazards from exposure and the need to further explore these endpoints in the context of environmental risk assessment.
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Affiliation(s)
- Miguel Ferreira Pinto
- a National Institute of Health Dr. Ricardo Jorge, I.P. , Department of Human Genetics , Lisbon , Portugal
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