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Ye C, Tu Y, Ling H, Chen Y, Liu Y, Zhang R, Zhang X. Occurrence, physicochemical properties and environmental behavior of polychlorinated dibenzothiophenes: A comprehensive review and future perspectives. ENVIRONMENTAL RESEARCH 2024; 245:118007. [PMID: 38154561 DOI: 10.1016/j.envres.2023.118007] [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: 10/14/2023] [Revised: 11/30/2023] [Accepted: 12/20/2023] [Indexed: 12/30/2023]
Abstract
Polychlorinated dibenzothiophenes (PCDTs) are a form of emerging pollutant that has attracted great attention due to their structural resemblance to dioxins, which cast detrimental influence on the ecosystem and human health. This review shows the current status of research on PCDTs, focusing on their environmental occurrence, physicochemical properties, environmental behavior, and toxicity. Studies have suggested that the steps leading to the formation of PCDTs resemble those generating polychlorinated dibenzo-p-dioxin/dibenzofurans (PCDD/Fs), indicating their probable origin from the same sources. Furthermore, they may undergo a dechlorination process as a result of their photodegradation in the environment and metabolic reaction occurring within organisms, which could result in the conversion of these substances into additional pollutants like dibenzothiophene. PCDTs exist widely in the environmental media and have high logKOW values (>4.0), indicating their tendency to bioaccumulate. Moreover, the prediction results of EPI (Estimation Program Interface) Suite demonstrated a strong accumulation capacity for tetra-CDTs in fish compared to other chlorinated PCDTs. The biotransformation half-life of PCDTs would prolong with an increasing number of substituted Cl atoms in fish. A limited number of studies have also suggested that PCDTs can cause damage to the liver and immune system in living organisms, and the toxicity of PCDTs depends on the number and position of substituted Cl atoms. Future studies should be conducted on processes causing PCDT toxicity as well as their behavior and fate in actual environments.
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Affiliation(s)
- Chunmeng Ye
- Jiangsu Environmental Engineering Technology Co., Ltd. Jiangsu Environmental Protection Group Co., Ltd. Jiangsu Nanjing 210036, China; Key Laboratory of Environmental Remediation and Ecological Health, Ministry of Industry and Information Technology, China
| | - Yong Tu
- Jiangsu Environmental Engineering Technology Co., Ltd. Jiangsu Environmental Protection Group Co., Ltd. Jiangsu Nanjing 210036, China; Key Laboratory of Environmental Remediation and Ecological Health, Ministry of Industry and Information Technology, China
| | - Hong Ling
- Jiangsu Environmental Engineering Technology Co., Ltd. Jiangsu Environmental Protection Group Co., Ltd. Jiangsu Nanjing 210036, China; Key Laboratory of Environmental Remediation and Ecological Health, Ministry of Industry and Information Technology, China
| | - Yong Chen
- Jiangsu Environmental Engineering Technology Co., Ltd. Jiangsu Environmental Protection Group Co., Ltd. Jiangsu Nanjing 210036, China; Key Laboratory of Environmental Remediation and Ecological Health, Ministry of Industry and Information Technology, China.
| | - Yang Liu
- Jiangsu Environmental Engineering Technology Co., Ltd. Jiangsu Environmental Protection Group Co., Ltd. Jiangsu Nanjing 210036, China; Key Laboratory of Environmental Remediation and Ecological Health, Ministry of Industry and Information Technology, China
| | - Rui Zhang
- School of Water Conservancy and Environment, University of Jinan, Jinan 250022, China
| | - Xuesheng Zhang
- School of Resources and Environmental Engineering, Anhui University, Anhui Hefei 230601, China.
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Lin Y, Li X, Zhang S, Yang Q, Zhang R, Zhang X. Congener Variation of Genetic Dependent-Developmental Toxicology in Two Emerging Classes of Dioxin-like Compounds. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:21650-21661. [PMID: 38078857 DOI: 10.1021/acs.est.3c05622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2023]
Abstract
Emerging classes of dioxin-like compounds (DLCs) like hydroxylated/methoxylated polybrominated diphenyl ethers (HO-/MeO-PBDEs) and polychlorinated diphenyl sulfides (PCDPSs) could lead to diverse adverse outcomes in humans and wildlife, yet knowledge gaps exist in their molecular mechanisms associated with different structures following early life environmental exposure. This study integrated a genetic knockout technique and concentration-dependent reduced zebrafish transcriptome approach (CRZT) to unravel the toxicological pathways underpinning developmental toxicity of four HO-/MeO-PBDEs and five PCDPSs at environmentally relevant doses. Generally, the dependence of aryl hydrocarbon receptor (AhR) on the embryotoxicity and transcriptomic potencies induced by the HO-PBDEs and PCDPSs varied across different congeners. The knockout of the ahr2 gene led to 1.02- to 76.48-fold decreases of DLC-induced embryotoxicities and reduced the transcriptome-based potencies ranging from 1.38 to 2124.74 folds in the CRZT test. The fold changes denoting AhR-mediated potentials significantly increased with the increasing chlorination degrees of MeO-PBDEs and PCDPSs (p < 0.05). Moreover, ahr2 knockout primarily affected the DLC-induced early molecular responses relevant to DNA damage, enzyme activation, and organ development. Our integrated approach revealed the differential role of AhR in mediating the developmental toxicity of emerging DLCs possessing varied structures at environmentally relevant doses.
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Affiliation(s)
- Yishan Lin
- State Key Laboratory of Pollution Control & Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
| | - Xueyi Li
- State Key Laboratory of Pollution Control & Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
| | - Shaoqing Zhang
- State Key Laboratory of Pollution Control & Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
| | - Qinyu Yang
- State Key Laboratory of Pollution Control & Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
| | - Rui Zhang
- School of Water Conservancy and Environment, University of Jinan, Jinan 250022, China
| | - Xiaowei Zhang
- State Key Laboratory of Pollution Control & Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
- Jiangsu Province Ecology and Environment Protection Key Laboratory of Chemical Safety and Health Risk, Nanjing 210023, China
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Doering JA, Tillitt DE, Wiseman S. Reevaluation of 2,3,7,8-Tetrachlorodibenzo-p-Dioxin Equivalency Factors for Dioxin-Like Polychlorinated Dibenzo-p-Dioxins, Polychlorinated Dibenzofurans, and Polychlorinated Biphenyls for Fishes. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2023; 42:2215-2228. [PMID: 37283214 DOI: 10.1002/etc.5690] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2022] [Revised: 02/12/2023] [Accepted: 06/05/2023] [Indexed: 06/08/2023]
Abstract
An expert meeting was organized by the World Health Organization (WHO) in 1997 to streamline assessments of risk posed by mixtures of dioxin-like chemicals (DLCs) through development of 2,3,7,8-tetrachlorodibenzo-p-dioxin (2,3,7,8-TCDD) equivalency factors (TEFs) for mammals, birds, and fishes. No reevaluation has been performed for fish TEFs. Therefore, the objective of the present study was to reevaluate the TEFs for fishes based on an updated database of relative potencies (RePs) for DLCs. Selection criteria consistent with the WHO meeting resulted in 53 RePs across 14 species of fish ultimately being considered. Of these RePs, 70% were not available at the time of the WHO meeting. These RePs were used to develop updated TEFs for fishes based on a similar decision process as used at the WHO meeting. The updated TEF for 16 DLCs was greater than the WHO TEF, but only four differed by more than an order of magnitude. Measured concentrations of DLCs in four environmental samples were used to compare 2,3,7,8-TCDD equivalents (TEQs) calculated using the WHO TEFs relative to the updated TEFs. The TEQs for none of these environmental samples differed by more than an order of magnitude. Therefore, present knowledge supports that the WHO TEFs are suitable potency estimates for fishes. However, the updated TEFs pull from a larger database with a greater breadth of data and as a result offer greater confidence relative to the WHO TEFs. Risk assessors will have different criteria in the selection of TEFs, and the updated TEFs are not meant to immediately replace the formal WHO TEFs; but those who value a larger database and increased confidence in TEQs could consider using the updated TEFs. Environ Toxicol Chem 2023;42:2215-2228. © 2023 Wiley Periodicals LLC. This article has been contributed to by U.S. Government employees and their work is in the public domain in the USA.
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Affiliation(s)
- Jon A Doering
- Department of Environmental Sciences, College of the Coast & Environment, Louisiana State University, Baton Rouge, Louisiana, USA
- Department of Biological Sciences, University of Lethbridge, Lethbridge, Alberta, Canada
| | - Donald E Tillitt
- Columbia Environmental Research Center, US Geological Survey, Columbia, Missouri
| | - Steve Wiseman
- Department of Biological Sciences, University of Lethbridge, Lethbridge, Alberta, Canada
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Nian K, Yang W, Zhang X, Zhang R, Xiong W, Crump D, Su G, Zhang X, Feng M, Shi J. Occurrence, partitioning, and bioaccumulation of an emerging class of PBT substances (polychlorinated diphenyl sulfides) in Chaohu Lake, Southeast China. WATER RESEARCH 2022; 218:118498. [PMID: 35489155 DOI: 10.1016/j.watres.2022.118498] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Revised: 04/10/2022] [Accepted: 04/21/2022] [Indexed: 06/14/2023]
Abstract
Polychlorinated diphenyl sulfides (PCDPSs) represent an emerging group of constituents that are persistent, bioaccumulative and toxic (PBT) substances of great concern in terms of human health and ecological integrity. However, little is known about the occurrence, environmental behaviour and ecological risks of PCDPSs in lake environments. In this study, the concentrations of 21 PCDPSs were determined in surface water, suspended particulate matter (SPM), sediments, and 8 fish species from Chaohu Lake, China. Eighteen PCDPS congeners were prevalently detected in the samples, with concentrations ranging from 0.272-1.69 ng/L (water), 0.477-2.03 ng/g d.w. (SPM), 0.719-4.07 ng/g d.w. (sediment) and 0-0.131 ng/g w.w. (fish), respectively. Medium- and high-chlorinated PCDPSs in SPM and sediment were significantly higher than those in water samples. Increased PCDPS concentrations were found in higher trophic level fishes and those with a demersal habitat preference, indicating their bioaccumulation and biomagnification potential. The logBCFs, BSSAFs, and BSAFs of PCDPS congeners in fishes were determined to be 3.91-5.18, 0.0500-2.33, and 0.0360-4.94 L/kg, respectively. The organic carbon normalized partition coefficients (logKoc) of PCDPSs in surface water-SPM (4.61-5.54 L/g) and surface water-sediment (4.38-5.69 L/g) systems were determined, and it was found that highly chlorinated PCDPSs were more prone to migrate from water to sediment and SPM. The toxic equivalent (TEQ) values of PCDPSs in the samples (lower than 10-1 pg/g or pg/L) and daily intake via fish consumption (0.180-0.340 μg/kg/day) were estimated for humans, and cumulative risk quotients (RQs) after correction at ten sampling sites (0.065-0.66) were calculated for green algae. The findings elucidated the environmental behaviour of PCDPSs in Chaohu Lake.
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Affiliation(s)
- Kainan Nian
- School of Resources and Environmental Engineering, Anhui University, Hefei, Anhui 230601, China; Laboratory of Wetland Protection and Ecological Restoration, Anhui University, Hefei, Anhui 230601, China
| | - Wenhui Yang
- School of Resources and Environmental Engineering, Anhui University, Hefei, Anhui 230601, China; Laboratory of Wetland Protection and Ecological Restoration, Anhui University, Hefei, Anhui 230601, China
| | - Xuesheng Zhang
- School of Resources and Environmental Engineering, Anhui University, Hefei, Anhui 230601, China; Laboratory of Wetland Protection and Ecological Restoration, Anhui University, Hefei, Anhui 230601, China.
| | - Rui Zhang
- School of Water Conservancy and Environment, University of Jinan, Jinan 250022, China.
| | - Wenli Xiong
- School of Resources and Environmental Engineering, Anhui University, Hefei, Anhui 230601, China; Laboratory of Wetland Protection and Ecological Restoration, Anhui University, Hefei, Anhui 230601, China
| | - Doug Crump
- Ecotoxicology and Wildlife Health Division, Environment and Climate Change Canada, National Wildlife Research Centre, Carleton University, 1125 Colonel By Drive, Ottawa K1A 0H3, Canada
| | - Guanyong Su
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Xiaowei Zhang
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
| | - Mingbao Feng
- College of Environment & Ecology, Xiamen University, Xiamen, China
| | - Jiaqi Shi
- Nanjing Institute of Environmental Sciences of the Ministry of Ecology and Environment, Nanjing, Jiangsu 210042, China.
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Zhang W, Xie HQ, Li Y, Zhou M, Zhou Z, Wang R, Hahn ME, Zhao B. The aryl hydrocarbon receptor: A predominant mediator for the toxicity of emerging dioxin-like compounds. JOURNAL OF HAZARDOUS MATERIALS 2022; 426:128084. [PMID: 34952507 PMCID: PMC9039345 DOI: 10.1016/j.jhazmat.2021.128084] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 11/29/2021] [Accepted: 12/12/2021] [Indexed: 06/01/2023]
Abstract
The aryl hydrocarbon receptor (AHR) is a member of the basic helix-loop-helix/Per-ARNT-Sim (bHLH-PAS) family of transcription factors and has broad biological functions. Early after the identification of the AHR, most studies focused on its roles in regulating the expression of drug-metabolizing enzymes and mediating the toxicity of dioxins and dioxin-like compounds (DLCs). Currently, more diverse functions of AHR have been identified, indicating that AHR is not just a dioxin receptor. Dioxins and DLCs occur ubiquitously and have diverse health/ecological risks. Additional research is required to identify both shared and compound-specific mechanisms, especially for emerging DLCs such as polyhalogenated carbazoles (PHCZs), polychlorinated diphenyl sulfides (PCDPSs), and others, of which only a few investigations have been performed at present. Many of the toxic effects of emerging DLCs were observed to be predominantly mediated by the AHR because of their structural similarity as dioxins, and the in vitro TCDD-relative potencies of certain emerging DLC congeners are comparable to or even greater than the WHO-TEFs of OctaCDD, OctaCDF, and most coplanar PCBs. Due to the close relationship between AHR biology and environmental science, this review begins by providing novel insights into AHR signaling (canonical and non-canonical), AHR's biochemical properties (AHR structure, AHR-ligand interaction, AHR-DNA binding), and the variations during AHR transactivation. Then, AHR ligand classification and the corresponding mechanisms are discussed, especially the shared and compound-specific, AHR-mediated effects and mechanisms of emerging DLCs. Accordingly, a series of in vivo and in vitro toxicity evaluation methods based on the AHR signaling pathway are reviewed. In light of current advances, future research on traditional and emerging DLCs will enhance our understanding of their mechanisms, toxicity, potency, and ecological impacts.
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Affiliation(s)
- Wanglong Zhang
- College of Life Sciences, Qufu Normal University, Qufu, Shandong 273165, China
| | - Heidi Qunhui Xie
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yunping Li
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Mingxi Zhou
- Biology Centre of the Czech Academy of Sciences v.v.i, Institute of Plant Molecular Biology, Branišovská 31, 370 05 České Budějovice, Czech Republic
| | - Zhiguang Zhou
- State Environmental Protection Key Laboratory of Dioxin Pollution Control, National Research Center for Environmental Analysis and Measurement, Beijing 100029, China
| | - Renjun Wang
- College of Life Sciences, Qufu Normal University, Qufu, Shandong 273165, China
| | - Mark E Hahn
- Biology Department, Woods Hole Oceanographic Institution (WHOI), Woods Hole, MA 02543, USA; Boston University Superfund Research Program, Boston University, Boston, MA 02118, USA
| | - Bin Zhao
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.
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