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Xiang Y, Zhang X, Tian Z, Cheng Y, Liu N, Meng X. Molecular mechanisms of 1,2-dichloroethane-induced neurotoxicity. Toxicol Res 2023; 39:565-574. [PMID: 37779589 PMCID: PMC10541367 DOI: 10.1007/s43188-023-00197-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Revised: 06/03/2023] [Accepted: 06/07/2023] [Indexed: 10/03/2023] Open
Abstract
The production of industrial solvents and adhesives often utilizes 1,2-dichloroethane (1,2-DCE), a highly toxic halogenated hydrocarbon compound. Occupational 1,2-DCE poisoning occurs frequently and is a public health concern. Exposure to 1,2-DCE can damage the brain, liver, and kidneys. The main and most severe damage caused by exposure to 1,2-DCE is to the nervous system, especially the central nervous system. Current research on 1,2-DCE mainly focuses on the mechanism of brain edema. Several possible mechanisms of 1,2-DCE neurotoxicity have been proposed, including oxidative stress, calcium overload, blood-brain barrier damage, and neurotransmitter changes. This article reviews the research progress on 1,2-DCE neurotoxicity and the mechanism behind it to provide a scientific basis for the prevention and treatment of 1,2-DCE poisoning.
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Affiliation(s)
- Yang Xiang
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, 1838 Guangzhoudadaobei, Guangzhou, Guangdong China
| | - Xiaoshun Zhang
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, 1838 Guangzhoudadaobei, Guangzhou, Guangdong China
| | - Zhiling Tian
- Shanghai Key Laboratory of Forensic Medicine, Ministry of Justice, Shanghai Forensic Service Platform, Key Laboratory of Forensic Science, Academy of Forensic Science, Shanghai, China
| | - Yibin Cheng
- Shanghai Key Laboratory of Forensic Medicine, Ministry of Justice, Shanghai Forensic Service Platform, Key Laboratory of Forensic Science, Academy of Forensic Science, Shanghai, China
| | - Ningguo Liu
- Shanghai Key Laboratory of Forensic Medicine, Ministry of Justice, Shanghai Forensic Service Platform, Key Laboratory of Forensic Science, Academy of Forensic Science, Shanghai, China
| | - Xiaojing Meng
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, 1838 Guangzhoudadaobei, Guangzhou, Guangdong China
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LeBaron MJ, Hotchkiss JA, Zhang F, Koehler MW, Boverhof DR. Investigation of potential early key events and mode of action for 1,2-dichloroethane-induced mammary tumors in female rats. J Appl Toxicol 2020; 41:362-374. [PMID: 32830330 DOI: 10.1002/jat.4048] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 06/30/2020] [Accepted: 07/28/2020] [Indexed: 01/01/2023]
Abstract
1,2-dichloroethane (DCE or EDC) is a chlorinated hydrocarbon used as a chemical intermediate, including in the synthesis of polyvinyl chloride. Although DCE has induced tumors in both rats and mice, the overall weight-of-evidence suggests a lack of in vivo mutagenicity. The present study was conducted to explore a potential mode of action further for tumor formation in rat mammary tissue. Fischer 344 rats were exposed to target concentrations of 0 or 200 ppm of DCE vapors (6 hours/day, 7 days/week) for at least 28 days; 200 ppm represents a concentration of ~20% higher than that reported to induce mammary tumors. Endpoints examined included DNA damage (via Comet assay), glutathione (reduced, oxidized and conjugated), tissue DNA adducts, cell proliferation and serum prolactin levels. Exposure to DCE did not alter serum prolactin levels with consistent estrous stage, did not cause cell proliferation in mammary epithelial cells, nor result in histopathological alterations in the mammary gland. DNA adducts were identified, including the N7 -guanylethyl glutathione adduct, with higher adduct levels measured in liver (nontumorigenic target) compared with mammary tissue isolated from the same rats; no known mutagenic adducts were identified. DCE did not increase the Comet assay response in mammary epithelial cells, whereas DNA damage in the positive control (N-nitroso-N-methylurea) was significantly increased. Although the result of this study did not identify a specific mode of action for DCE-induced mammary tumors in rats, the lack of any exposure-related genotoxic responses further contributes to the weight-of-evidence suggesting that DCE is a nongenotoxic carcinogen.
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Affiliation(s)
- Matthew J LeBaron
- The Dow Chemical Company, Toxicology & Environmental Research & Consulting, Midland, Michigan, USA
| | - Jon A Hotchkiss
- The Dow Chemical Company, Toxicology & Environmental Research & Consulting, Midland, Michigan, USA
| | - Fagen Zhang
- The Dow Chemical Company, Toxicology & Environmental Research & Consulting, Midland, Michigan, USA
| | - Matthew W Koehler
- The Dow Chemical Company, Toxicology & Environmental Research & Consulting, Midland, Michigan, USA
| | - Darrell R Boverhof
- The Dow Chemical Company, Toxicology & Environmental Research & Consulting, Midland, Michigan, USA
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Gesundheitliche Bewertung von 1,2-Dichlorethan (1,2-DCE) in der Innenraumluft. Bundesgesundheitsblatt Gesundheitsforschung Gesundheitsschutz 2019; 62:114-117. [DOI: 10.1007/s00103-018-2849-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Lin C, Nguyen KA, Vu CT, Senoro D, Villanueva MC. Contamination levels and potential sources of organic pollution in an Asian river. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2017; 76:2434-2444. [PMID: 29144301 DOI: 10.2166/wst.2017.419] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The Houjing River has long been an environmental victim of economic development. Industries that have settled along the bank of this river may have largely contributed to severe organic wastes pollution. This study collected water and sediment samples at various points along the river and measured concentrations of 61 volatile organic compounds (VOCs) and 128 semi-volatile organic compounds (SVOCs) for a period of 16 months (Feb 2014-June 2015). Our analyses show that elevated levels of VOCs were observed near two industrial areas, Dashe and Renwu industrial parks. High SVOC concentrations were found in the vicinities of the Nanzih Export Processing Zone (NEPZ) and CingPu station, possibly due to considerable effluent discharges of adjacent industrial and residential areas. Comparing this study's findings with the standard values of different governmental agencies and studies similar to this one, the ecosystem of the Houjing River was seriously contaminated. This study could be used by the government as a basis for future and urgent pollution prevention actions aimed at protecting this ecosystem and reducing the negative impacts of these contaminants on the health and well-being of the local residents and the environment.
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Affiliation(s)
- Chitsan Lin
- Center of Environmental Analysis Service, National Kaohsiung Marine University, Kaohsiung 81157, Taiwan E-mail:
| | - Kim Anh Nguyen
- Center of Environmental Analysis Service, National Kaohsiung Marine University, Kaohsiung 81157, Taiwan E-mail:
| | - Chi Thanh Vu
- Center of Environmental Analysis Service, National Kaohsiung Marine University, Kaohsiung 81157, Taiwan E-mail:
| | - Delia Senoro
- Sustainable Development Research Office, Mapúa University, Manila 1002, Philippines
| | - Maria Ching Villanueva
- IFREMER Centre de Bretagne, Unité de Sciences et Technologies Halieutiques, Pointe du Diable B.P. 70, Plouzané 29280, France
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Suguro M, Numano T, Kawabe M, Doi Y, Imai N, Mera Y, Tamano S. Lung Tumor Induction by 26-week Dermal Application of 1,2-Dichloroethane in CB6F1-Tg rasH2 Mice. Toxicol Pathol 2017; 45:427-434. [DOI: 10.1177/0192623317701003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Short-term alternatives to traditional 2-year carcinogenic studies in rodents are being actively pursued. Recently, a 26-week short-term carcinogenicity study using CB6F1-Tg rasH2@Jcl (rasH2) mice has become a worldwide standard for the evaluation of chemical carcinogenesis. However, an acceptable short-term carcinogenic study model for dermally applied products is still lacking. To investigate the suitability of using the rasH2 mouse to test carcinogenic potential, 1,2-dichloroethane (1,2-DCE) was dermally applied to rasH2 mice: 1,2-DCE is a known carcinogen that causes lung bronchiolo-alveolar adenomas and adenocarcinomas when administered topically, orally, or by inhalation exposure; 1,2-DCE at a dose level of 126 mg/mouse in 200 μl acetone or acetone alone (vehicle control) was applied to the dorsal skin of 10 mice of each sex 3 times a week for 26 weeks. As a positive control, 10 mice of each sex received a single intraperitoneal injection of 75 mg/kg of N-methyl- N-nitrosourea. Bronchiolo-alveolar adenomas and adenocarcinomas were significantly increased in 1,2-DCE-treated rasH2 mice of both sexes, and bronchiolo-alveolar hyperplasias were significantly increased in female mice. Overall, almost all mice of each sex developed adenomas and/or adenocarcinomas with 100% of female rasH2 mice developing bronchiolo-alveolar adenocarcinomas.
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Affiliation(s)
- Mayuko Suguro
- DIMS Institute of Medical Science, Inc., Ichinomiya, Aichi, Japan
| | - Takamasa Numano
- DIMS Institute of Medical Science, Inc., Ichinomiya, Aichi, Japan
| | - Mayumi Kawabe
- DIMS Institute of Medical Science, Inc., Ichinomiya, Aichi, Japan
| | - Yuko Doi
- DIMS Institute of Medical Science, Inc., Ichinomiya, Aichi, Japan
| | - Norio Imai
- DIMS Institute of Medical Science, Inc., Ichinomiya, Aichi, Japan
| | - Yukinori Mera
- DIMS Institute of Medical Science, Inc., Ichinomiya, Aichi, Japan
| | - Seiko Tamano
- DIMS Institute of Medical Science, Inc., Ichinomiya, Aichi, Japan
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Route-to-route extrapolation of 1,2-dichloroethane studies from the oral route to inhalation using physiologically based pharmacokinetic models. Regul Toxicol Pharmacol 2016; 81:468-479. [PMID: 27756559 DOI: 10.1016/j.yrtph.2016.10.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2016] [Revised: 09/27/2016] [Accepted: 10/14/2016] [Indexed: 11/21/2022]
Abstract
To help develop a comprehensive, quantitative understanding of the hazards of 1,2-dichloroethane (ethylene dichloride, EDC, CAS No. 107-06-2) exposure by the inhalation route, the results of existing subchronic studies and an extended one-generation reproductive toxicity (EOGRT) study recently conducted by the oral route in rats were extrapolated using a physiologically based pharmacokinetic (PBPK) model. The no observed adverse effects levels (NOAELs) for the endpoints of neurotoxicity and reproductive/developmental toxicity were the highest tested doses of 169 and 155 mg/kg-day, respectively. These NOAELs were equivalent to continuous exposure of rats to minimums of 76 ppm and 62 ppm EDC, respectively, using total metabolism of EDC as the dose metric that is equivalent in the oral and inhalation scenarios. In contrast, the subchronic study NOAEL of 37.5 mg/kg-day corresponded to continuous inhalation of 4.4 ppm EDC, based on equivalent extrahepatic metabolism. The selection of the internal metric which serves to establish route-to-route equivalency was found to profoundly influence the NOAEL-equivalent inhalation exposure concentration and thus will be a key determinant of inhalation toxicity reference criteria developed on the basis of EDC studies conducted by the oral route.
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Abstract
The Texas Commission on Environmental Quality (TCEQ) conducts up-to-date carcinogenic assessments for chemicals emitted in Texas. An inhalation unit risk factor (URF) was developed for ethylene dichloride (EDC, CAS 107-06-2) based on tumorigenicity results observed in a 2-year animal inhalation study conducted by Nagano et al. More specifically, the incidence of combined mammary gland tumors (adenomas, fibroadenomas, adenocarcinomas) in female rats demonstrated a statistically significant dose-response relationship, was amenable to benchmark concentration (BMC) modeling, was ultimately determined to be the most sensitive tumorigenic effect in the most sensitive species and sex, and was utilized as the carcinogenic endpoint for the development of the URF. The 95% lower confidence limit of the BMC at the 10% excess risk level (BMCL10 of 40.1 ppm) was determined for calculation of the URF. The resulting URF based on increased incidence of combined mammary gland tumors in female rats is 1.4E-02 per ppm (3.4E-03 per mg/m(3)). The lifetime air concentration corresponding to a no significant excess risk level of 1 in 100 000 is 0.71 ppb (2.9 μg/m(3)), which is considered sufficiently health-protective for use in protecting the general public against the potential carcinogenic effects of chronic exposure to EDC in ambient air.
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Affiliation(s)
- Jessica L Myers
- a Division of Toxicology , Texas Commission on Environmental Quality , Austin , TX , USA
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Li W, Chen L, Su Y, Yin H, Pang Y, Zhuang Z. 1,2-Dichloroethane induced nephrotoxicity through ROS mediated apoptosis in vitro and in vivo. Toxicol Res (Camb) 2015. [DOI: 10.1039/c5tx00056d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
1,2-Dichloroethane (DCE) decreased kidney cell proliferation, even induced cell apoptosisviaincreasing the generation of ROS in the presence of an extra-metabolic system.
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Affiliation(s)
- Wenxue Li
- Faculty of Toxicology
- Guangzhou key laboratory of Environmental Pollution and Health Risk Assessment
- School of Public Health
- Sun Yet-sen University
- Guangzhou
| | - Liping Chen
- Faculty of Toxicology
- Guangzhou key laboratory of Environmental Pollution and Health Risk Assessment
- School of Public Health
- Sun Yet-sen University
- Guangzhou
| | - Yiwei Su
- Faculty of Toxicology
- Guangzhou key laboratory of Environmental Pollution and Health Risk Assessment
- School of Public Health
- Sun Yet-sen University
- Guangzhou
| | - Hua Yin
- Faculty of Toxicology
- Guangzhou key laboratory of Environmental Pollution and Health Risk Assessment
- School of Public Health
- Sun Yet-sen University
- Guangzhou
| | - Yaqin Pang
- Faculty of Toxicology
- School of Public Health
- Youjiang Medical University for Nationalities
- Guangxi
- China
| | - Zhixiong Zhuang
- Faculty of Toxicology
- Guangzhou key laboratory of Environmental Pollution and Health Risk Assessment
- School of Public Health
- Sun Yet-sen University
- Guangzhou
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Huang B, Lei C, Wei C, Zeng G. Chlorinated volatile organic compounds (Cl-VOCs) in environment - sources, potential human health impacts, and current remediation technologies. ENVIRONMENT INTERNATIONAL 2014; 71:118-38. [PMID: 25016450 DOI: 10.1016/j.envint.2014.06.013] [Citation(s) in RCA: 332] [Impact Index Per Article: 33.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2013] [Revised: 06/20/2014] [Accepted: 06/24/2014] [Indexed: 05/03/2023]
Abstract
Chlorinated volatile organic compounds (Cl-VOCs), including polychloromethanes, polychloroethanes and polychloroethylenes, are widely used as solvents, degreasing agents and a variety of commercial products. These compounds belong to a group of ubiquitous contaminants that can be found in contaminated soil, air and any kind of fluvial mediums such as groundwater, rivers and lakes. This review presents a summary of the research concerning the production levels and sources of Cl-VOCs, their potential impacts on human health as well as state-of-the-art remediation technologies. Important sources of Cl-VOCs principally include the emissions from industrial processes, the consumption of Cl-VOC-containing products, the disinfection process, as well as improper storage and disposal methods. Human exposure to Cl-VOCs can occur through different routes, including ingestion, inhalation and dermal contact. The toxicological impacts of these compounds have been carefully assessed, and the results demonstrate the potential associations of cancer incidence with exposure to Cl-VOCs. Most Cl-VOCs thus have been listed as priority pollutants by the Ministry of Environmental Protection (MEP) of China, Environmental Protection Agency of the U.S. (U.S. EPA) and European Commission (EC), and are under close monitor and strict control. Yet, more efforts will be put into the epidemiological studies for the risk of human exposure to Cl-VOCs and the exposure level measurements in contaminated sites in the future. State-of-the-art remediation technologies for Cl-VOCs employ non-destructive methods and destructive methods (e.g. thermal incineration, phytoremediation, biodegradation, advanced oxidation processes (AOPs) and reductive dechlorination), whose advantages, drawbacks and future developments are thoroughly discussed in the later sections.
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Affiliation(s)
- Binbin Huang
- College of Environment Science and Engineering, Hunan University, Changsha 410082, P.R. China
| | - Chao Lei
- School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha 410114, P.R. China
| | - Chaohai Wei
- Key Laboratory of Environmental Protection and Eco-Remediation of Guangdong Regular Higher Education Institutions, South China University of Technology, Guangzhou 510006, P.R. China
| | - Guangming Zeng
- College of Environment Science and Engineering, Hunan University, Changsha 410082, P.R. China
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Azuma K, Uchiyama I, Chiba Y, Okumura J. Mesothelioma Risk and Environmental Exposure to Asbestos: Past and Future Trends in Japan. INTERNATIONAL JOURNAL OF OCCUPATIONAL AND ENVIRONMENTAL HEALTH 2013; 15:166-72. [DOI: 10.1179/oeh.2009.15.2.166] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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Ohnishi M, Umeda Y, Katagiri T, Kasai T, Ikawa N, Nishizawa T, Fukushima S. Inhalation carcinogenicity of 1,1,1-trichloroethane in rats and mice. Inhal Toxicol 2013; 25:298-306. [PMID: 23614731 DOI: 10.3109/08958378.2013.780116] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Carcinogenicity of 1,1,1-trichloroethane (TCE) was examined by an inhalation exposure of F344 rats and BDF1 mice of both sexes to TCE at 0, 200, 800 or 3200 ppm for 6 h/d, 5 d/week for 104 weeks. In male rats, the incidences of bronchiolo-alveolar adenomas and peritoneal mesotheliomas were significantly increased in the 800 and 3200 ppm-exposed groups, respectively. The incidence of bronchiolo-alveolar adenomas in the 3200 ppm-exposed groups exceeded the range of historical control data in the Japan Bioassay Research Center. In female rats, the tumor incidences were not increased in any organs of the TCE-exposed groups. In male mice, a significant positive trend with dose was shown for incidences of bronchiolo-alveolar carcinomas, combined incidences of bronchiolo-alveolar adenomas/carcinomas and hepatocellular adenomas. The incidence of Harderian gland adenomas was significantly increased in the 3200 ppm-exposed group, and malignant lymphomas of spleen at this highest dose exceeded the range of historical control data. In female mice, the combined incidence of bronchiolo-alveolar adenomas/carcinomas was significantly increased in the 3200 ppm-exposed group, and the incidences of hepatocellular adenomas and combined incidences of hepatocellular adenomas/carcinomas were significantly increased in the 200, 800 and 3200 ppm-exposed groups with dose dependence except the combined incidence of hepatocellular adenomas/carcinomas in the 200 ppm-exposed group. The incidences of bronchiolo-alveolar adenomas in the 3200 ppm-exposed group and combined incidences of hepatocellular adenomas/carcinomas in the 200 ppm-exposed groups exceeded the ranges of historical control data. Thus, this study provided clear evidence of inhalation carcinogenicity for TCE in both rats and mice.
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Affiliation(s)
- Makoto Ohnishi
- Japan Bioassay Research Center, Japan Industrial Safety and Health Association, Hadano, Kanagawa, Japan.
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Take M, Takanobu K, Takeuchi T, Haresaku M, Matsumoto M, Nagano K, Yamamoto S, Fukushima S. Distribution of blood and tissue concentrations in rats by inhalation exposure to 1,2-dichloroethane. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART A, TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING 2013; 48:1031-1036. [PMID: 23573923 DOI: 10.1080/10934529.2013.773765] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The compound 1,2-dichloroethane (DCE) is a ubiquitous environmental contaminant. The primary route of exposure of humans to DCE is inhalation of its vapor. The present investigation was undertaken to determine the distribution and accumulation of DCE in the blood, lung, liver, brain, kidney and abdominal fat of rats during and after inhalation exposure. Male rats were exposed to 160 ppm (v/v) of DCE vapor for 360 min and the concentrations of DCE in the blood and tissues during the inhalation exposure period and after the end of the exposure period were measured. DCE accumulation in the abdominal fat was much greater than that in the blood and other tissues. The information we obtained in this study is useful basic data pertaining to the pharmacokinetics of DCE and DCE-mediated carcinogenicity: Our results suggest that one of the factors involved in the induction of peritoneal tumors in rats exposed to DCE vapor by inhalation is DCE accumulation in the abdominal fat.
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Affiliation(s)
- Makoto Take
- Japan Bioassay Research Center, Japan Industrial Safety and Health Association, Hadano, Kanagawa, Japan.
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Shimizu Y, Matsuzaki S, Mori M, Dobashi K. Chronic exposure to particles caused bronchioloalveolar carcinoma in a patient with cryptogenic organizing pneumonia evaluated by elemental analysis. Immunopharmacol Immunotoxicol 2012; 34:170-3. [DOI: 10.3109/08923973.2011.587434] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Kawamoto T, Pham TTP, Matsuda T, Oyama T, Tanaka M, Yu HS, Uchiyama I. Historical review on development of environmental quality standards and guideline values for air pollutants in Japan. Int J Hyg Environ Health 2011; 214:296-304. [PMID: 21680244 DOI: 10.1016/j.ijheh.2011.05.007] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2010] [Revised: 04/09/2011] [Accepted: 05/17/2011] [Indexed: 11/30/2022]
Abstract
Environmental quality standards (EQSs) have been established as desirable levels to be maintained for protection of human health and the conservation of the living environment by Basic Environment Law. EQSs in ambient air had been set for 10 substances (sulfur dioxide (SO(2)), carbon monoxide (CO), suspended particulate matter (SPM), nitrogen dioxide (NO(2)) and photochemical oxidants (Ox), benzene, tetrachloroethylene, trichloroethylene, dioxins and dichloromethane) and guideline values for 7 (acrylonitorile, vinyl chloride monomer, mercury, nickel compounds, 1,3-butadiene, chloroform and 1,2-dichloromethane) in Japan by 2009. EQSs for the classical (or traditional) air pollutants, SO(2), CO, SPM, NO(2) and Ox, were set according to the minimal requirement to protect human health, based on evidence from epidemiological studies conducted before the 1970s. In 1996, the Central Environment Council designated substances which may be hazardous air pollutants and substances requiring priority action, and adopted the concept of risk assessment to set EQSs and guideline values. A life-long risk level (virtually safe dose) of 10(-5) was used to set EQS for benzene, and guideline values for vinyl chloride monomer, nickel compounds, and 1,3-butadiene. EQSs for trichloroethylene, tetrachloroethylene and dichloromethane, and guideline values for acrylonitorile and mercury were set using uncertain factors and lowest observed adverse effect (LOAEL)/no observed adverse effect level (NOAEL). The results of animal experiments were utilized to set guideline values for chloroform and 1,2-dichloroethane. The benchmark approach and human equivalent concentration (HEC) were adopted for 1,2-dichloroethane. The history of setting EQSs and guideline values for hazardous air pollutants is one of adopting new concepts into risk assessment.
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Affiliation(s)
- Toshihiro Kawamoto
- Department of Environmental Health, University of Occupational and Environmental Health, Japan.
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A review of the genotoxicity of 1,2-dichloroethane (EDC). MUTATION RESEARCH-REVIEWS IN MUTATION RESEARCH 2011; 727:42-53. [DOI: 10.1016/j.mrrev.2011.01.001] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2010] [Revised: 01/06/2011] [Accepted: 01/10/2011] [Indexed: 11/21/2022]
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Budnik LT, Fahrenholtz S, Kloth S, Baur X. Halogenated hydrocarbon pesticides and other volatile organic contaminants provide analytical challenges in global trading. ACTA ACUST UNITED AC 2010; 12:936-42. [DOI: 10.1039/b918428g] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Maronpot RR, Zeiger E, McConnell EE, Kolenda-Roberts H, Wall H, Friedman MA. Induction of tunica vaginalis mesotheliomas in rats by xenobiotics. Crit Rev Toxicol 2009; 39:512-37. [DOI: 10.1080/10408440902969430] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Kobayashi K, Pillai KS, Sakuratani Y, Abe T, Kamata E, Hayashi M. Evaluation of statistical tools used in short-term repeated dose administration toxicity studies with rodents. J Toxicol Sci 2008; 33:97-104. [DOI: 10.2131/jts.33.97] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- Katsumi Kobayashi
- Chemical Management Center, National Institute of Technology Evaluation
| | | | - Yuki Sakuratani
- Chemical Management Center, National Institute of Technology Evaluation
| | - Takemaru Abe
- Chemical Management Center, National Institute of Technology Evaluation
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