1
|
Jiang L, Yang J, Yang H, Kong L, Ma H, Zhu Y, Zhao X, Yang T, Liu W. Advanced understanding of the polybrominated diphenyl ethers (PBDEs): Insights from total environment to intoxication. Toxicology 2024; 509:153959. [PMID: 39341352 DOI: 10.1016/j.tox.2024.153959] [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: 08/20/2024] [Revised: 09/22/2024] [Accepted: 09/23/2024] [Indexed: 10/01/2024]
Abstract
Polybrominated diphenyl ethers (PBDEs) are brominated compounds connected by ester bonds between two benzene rings. There are 209 congeners of PBDEs, classified according to the number and position of the bromine atoms. Due to their low cost and superior flame retardant properties, PBDEs have been extensively used as flame retardants in electronic products, plastics, textiles, and other materials since the 1970s. PBDEs are classified as persistent organic pollutants (POPs) under the Stockholm Convention because of their environmental persistence, bioaccumulation, and toxicity to both humans and wildlife. Due to their extensive use and significant quantities, PBDEs have been detected across a range of environments and biological organisms. These compounds are known to cause damage to the metabolic system, exhibit neurotoxicity, and pose reproductive hazards. This review investigates the environmental distribution and human exposure pathways of PBDEs. Using China-a country with significant PBDE use-as an example, it highlights substantial regional and temporal variations in PBDE concentrations and notes that certain environmental levels may pose risks to human health. The article then examines the toxic effects and mechanisms of PBDEs on several major target organs, summarizing recent research and the specific mechanisms underlying these toxic effects from multiple toxicological perspectives. This review enhances our understanding of PBDEs' environmental distribution, exposure pathways, and toxic mechanisms, offering valuable insights for further research and management strategies.
Collapse
Affiliation(s)
- Liujiangshan Jiang
- Department of Environmental and Occupational Health, School of Public Health, China Medical University, Shenyang 110122, China; Key Laboratory of Environmental Stress and Chronic Disease Control & Prevention (China Medical University), Ministry of Education, China
| | - Jing Yang
- Department of Environmental and Occupational Health, School of Public Health, China Medical University, Shenyang 110122, China; Key Laboratory of Environmental Stress and Chronic Disease Control & Prevention (China Medical University), Ministry of Education, China
| | - Huajie Yang
- Department of Environmental and Occupational Health, School of Public Health, China Medical University, Shenyang 110122, China; Key Laboratory of Environmental Stress and Chronic Disease Control & Prevention (China Medical University), Ministry of Education, China
| | - Lingxu Kong
- Department of Environmental and Occupational Health, School of Public Health, China Medical University, Shenyang 110122, China; Key Laboratory of Environmental Stress and Chronic Disease Control & Prevention (China Medical University), Ministry of Education, China
| | - Haonan Ma
- Department of Environmental and Occupational Health, School of Public Health, China Medical University, Shenyang 110122, China; Key Laboratory of Environmental Stress and Chronic Disease Control & Prevention (China Medical University), Ministry of Education, China
| | - Yapei Zhu
- Department of Environmental and Occupational Health, School of Public Health, China Medical University, Shenyang 110122, China; Key Laboratory of Environmental Stress and Chronic Disease Control & Prevention (China Medical University), Ministry of Education, China
| | - Xuan Zhao
- Department of Environmental and Occupational Health, School of Public Health, China Medical University, Shenyang 110122, China; Key Laboratory of Environmental Stress and Chronic Disease Control & Prevention (China Medical University), Ministry of Education, China
| | - Tianyao Yang
- Department of Environmental and Occupational Health, School of Public Health, China Medical University, Shenyang 110122, China; Key Laboratory of Environmental Stress and Chronic Disease Control & Prevention (China Medical University), Ministry of Education, China.
| | - Wei Liu
- Department of Environmental and Occupational Health, School of Public Health, China Medical University, Shenyang 110122, China; Key Laboratory of Environmental Stress and Chronic Disease Control & Prevention (China Medical University), Ministry of Education, China.
| |
Collapse
|
2
|
Schrenk D, Bignami M, Bodin L, Chipman JK, del Mazo J, Grasl‐Kraupp B, Hogstrand C, (Ron) Hoogenboom L, Leblanc J, Nebbia CS, Nielsen E, Ntzani E, Petersen A, Sand S, Schwerdtle T, Wallace H, Benford D, Fürst P, Hart A, Rose M, Schroeder H, Vrijheid M, Ioannidou S, Nikolič M, Bordajandi LR, Vleminckx C. Update of the risk assessment of polybrominated diphenyl ethers (PBDEs) in food. EFSA J 2024; 22:e8497. [PMID: 38269035 PMCID: PMC10807361 DOI: 10.2903/j.efsa.2024.8497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2024] Open
Abstract
The European Commission asked EFSA to update its 2011 risk assessment on polybrominated diphenyl ethers (PBDEs) in food, focusing on 10 congeners: BDE-28, -47, -49, -99, -100, -138, -153, -154, -183 and ‑209. The CONTAM Panel concluded that the neurodevelopmental effects on behaviour and reproductive/developmental effects are the critical effects in rodent studies. For four congeners (BDE-47, -99, -153, -209) the Panel derived Reference Points, i.e. benchmark doses and corresponding lower 95% confidence limits (BMDLs), for endpoint-specific benchmark responses. Since repeated exposure to PBDEs results in accumulation of these chemicals in the body, the Panel estimated the body burden at the BMDL in rodents, and the chronic intake that would lead to the same body burden in humans. For the remaining six congeners no studies were available to identify Reference Points. The Panel concluded that there is scientific basis for inclusion of all 10 congeners in a common assessment group and performed a combined risk assessment. The Panel concluded that the combined margin of exposure (MOET) approach was the most appropriate risk metric and applied a tiered approach to the risk characterisation. Over 84,000 analytical results for the 10 congeners in food were used to estimate the exposure across dietary surveys and age groups of the European population. The most important contributors to the chronic dietary Lower Bound exposure to PBDEs were meat and meat products and fish and seafood. Taking into account the uncertainties affecting the assessment, the Panel concluded that it is likely that current dietary exposure to PBDEs in the European population raises a health concern.
Collapse
|
3
|
Berger ML, Shaw SD, Rolsky CB, Chen D, Sun J, Rosing-Asvid A, Granquist SM, Simon M, Bäcklin BM, Roos AM. Alternative and legacy flame retardants in marine mammals from three northern ocean regions. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023; 335:122255. [PMID: 37517638 DOI: 10.1016/j.envpol.2023.122255] [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: 06/01/2023] [Revised: 07/13/2023] [Accepted: 07/24/2023] [Indexed: 08/01/2023]
Abstract
Flame retardants are globally distributed contaminants that have been linked to negative health effects in humans and wildlife. As top predators, marine mammals bioaccumulate flame retardants and other contaminants in their tissues which is one of many human-imposed factors threatening population health. While some flame retardants, such as the polybrominated diphenyl ethers (PBDE), have been banned because of known toxicity and environmental persistence, limited data exist on the presence and distribution of current-use alternative flame retardants in marine mammals from many industrialized and remote regions of the world. Therefore, this study measured 44 legacy and alternative flame retardants in nine marine mammal species from three ocean regions: the Northwest Atlantic, the Arctic, and the Baltic allowing for regional, species, age, body condition, temporal, and tissue comparisons to help understand global patterns. PBDE concentrations were 100-1000 times higher than the alternative brominated flame retardants (altBFRs) and Dechloranes. 2,2',4,5,5'-pentabromobiphenyl (BB-101) and hexabromobenzene (HBBZ) were the predominant altBFRs, while Dechlorane-602 was the predominant Dechlorane. This manuscript also reports only the second detection of hexachlorocyclopentadienyl-dibromocyclooctane (HCDBCO) in marine mammals. The NW Atlantic had the highest PBDE concentrations followed by the Baltic and Arctic which reflects greater historical use of PBDEs in North America compared to Europe and greater industrialization of North America and Baltic countries compared to the Arctic. Regional patterns for other compounds were more complicated, and there were significant interactions among species, regions, body condition and age class. Lipid-normalized PBDE concentrations in harbor seal liver and blubber were similar, but HBBZ and many Dechloranes had higher concentrations in liver, indicating factors other than lipid dynamics affect the distribution of these compounds. The health implications of contamination by this mixture of compounds are of concern and require further research.
Collapse
Affiliation(s)
- Michelle L Berger
- Shaw Institute, PO Box 1652, 55 Main Street, Blue Hill, ME, 04614, USA.
| | - Susan D Shaw
- Shaw Institute, PO Box 1652, 55 Main Street, Blue Hill, ME, 04614, USA
| | - Charles B Rolsky
- Shaw Institute, PO Box 1652, 55 Main Street, Blue Hill, ME, 04614, USA
| | - Da Chen
- School of Environment and Guangdong Key Laboratory of Environmental Pollution and Health, Jinan University, Guangzhou, Guangdong, 510632, China; Cooperative Wildlife Research Laboratory and Department of Zoology, Southern Illinois University, Carbondale, IL, 62901, USA
| | - Jiachen Sun
- School of Environment and Guangdong Key Laboratory of Environmental Pollution and Health, Jinan University, Guangzhou, Guangdong, 510632, China; College of Marine Life Science, Ocean University of China, CN-266003, Qingdao, China
| | - Aqqalu Rosing-Asvid
- Greenland Climate Research Centre, Greenland Institute of Natural Resources, Kivioq 2, PO Box 570, 3900, Nuuk, Greenland
| | - Sandra Magdalena Granquist
- Seal Research Department, The Icelandic Seal Center, Höfðabraut 6, 530 Hvammstangi, Iceland; Marine and Freshwater Research Institute, Fornubúðir 5, 220 Hafnarfjörður, Iceland
| | - Malene Simon
- Greenland Climate Research Centre, Greenland Institute of Natural Resources, Kivioq 2, PO Box 570, 3900, Nuuk, Greenland
| | - Britt-Marie Bäcklin
- Department of Environmental Research and Monitoring, Swedish Museum of Natural History, PO Box 104 05 Stockholm, Sweden
| | - Anna Maria Roos
- Greenland Climate Research Centre, Greenland Institute of Natural Resources, Kivioq 2, PO Box 570, 3900, Nuuk, Greenland; Department of Environmental Research and Monitoring, Swedish Museum of Natural History, PO Box 104 05 Stockholm, Sweden
| |
Collapse
|
4
|
Wang J, Tang J, Li X, Ning X, Sun C, Zhang N, Zhang S. Curcumin alleviates spleen immunotoxicity induced by decabrominated diphenyl ethers (BDE-209) by improving immune function and inhibiting inflammation and apoptosis in broilers. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2023; 259:115048. [PMID: 37224787 DOI: 10.1016/j.ecoenv.2023.115048] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Revised: 04/21/2023] [Accepted: 05/19/2023] [Indexed: 05/26/2023]
Abstract
This study was conducted to assess the mitigating effects of curcumin (Cur) on immunotoxicity in the spleen of broilers induced by the polybrominated diphenyl ether BDE-209. Eighty one-day-old broilers were allocated to the following four groups: control group, BDE-209 (0.4 g/kg) group, BDE-209 (0.4 g/kg) + Cur (0.3 mg/kg) group, and Cur (0.3 mg/kg) group. Growth performance, immunological function, inflammation, and apoptosis were assessed after 42 days of treatment. The findings demonstrate that firstly, Cur restored spleen damage caused by BDE-209 by increasing body weight, decreasing feed-to-gain ratio, correcting the spleen index, and improving the histopathological structure of the spleen. Secondly, Cur relieved BDE-209-induced immunosuppression by increasing the levels of the immunoglobulins IgG, IgM, and IgA in the serum, as well as the levels of white blood cells and lymphocytes. The levels at which GATA binding protein 3, T-box expressed in T cells, interferon-γ, and interleukin (IL)- 4 are expressed were controlled. The ratio of T helper (Th) type 1 (Th1) to Th2 cells in the spleen of broilers was also controlled. Thirdly, Cur reduced the expression of Toll like receptor (TLR) 2, TLR4, nuclear factor (NF)-κB, IL-8, IL-6, and IL-1β, which alleviated BDE-209-induced inflammation in broilers. Cur reduced BDE-209-induced apoptosis by increasing the expression of the bcl-2 protein, decreasing the expression of cleaved caspase-3 and bax proteins, decreasing the bax/bcl-2 protein ratio, and decreasing the mean optical density of TUNEL. These results suggest that Cur protects broiler spleens from BDE-209-induced immunotoxicity via modulating humoral immunity, the equilibrium between Th1 and Th2 cells, the TLRs/NF-κB inflammatory pathway, and the apoptotic pathway.
Collapse
Affiliation(s)
- Jiaqi Wang
- College of Veterinary Medicine, Hebei Agricultural University, Baoding, PR China
| | - Jilang Tang
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, PR China.
| | - Xueqin Li
- College of Veterinary Medicine, Hebei Agricultural University, Baoding, PR China
| | - Xiaqing Ning
- College of Veterinary Medicine, Hebei Agricultural University, Baoding, PR China
| | - Chen Sun
- College of Veterinary Medicine, Hebei Agricultural University, Baoding, PR China
| | - Nuannuan Zhang
- College of Veterinary Medicine, Hebei Agricultural University, Baoding, PR China
| | - Shixia Zhang
- College of Veterinary Medicine, Hebei Agricultural University, Baoding, PR China.
| |
Collapse
|
5
|
Zhuang J, Pan ZJ, Qin Y, Liang H, Zhang WF, Sun ZY, Shi HB. Evaluation of BDE-47-induced neurodevelopmental toxicity in zebrafish embryos. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:54022-54034. [PMID: 36869944 DOI: 10.1007/s11356-023-26170-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Accepted: 02/23/2023] [Indexed: 06/18/2023]
Abstract
There are growing concerns about the neurodevelopmental toxicity of polybrominated diphenyl ethers (PBDEs), but the toxicological phenotypes and mechanisms are not well elucidated. Here, zebrafish (Danio rerio) were exposed to 2,2',4,4'-tetrabromodiphenyl ether (BDE-47) from 4 to 72 h post-fertilization (hpf). The results showed that BDE-47 stimulated the production of dopamine and 5-hydroxytryptamine, but inhibited expression of Nestin, GFAP, Gap43, and PSD95 in 24 hpf embryos. Importantly, we unraveled the inhibitory effects of BDE-47 on neural crest-derived melanocyte differentiation and melanin syntheses process, evidenced by disrupted expression of wnt1, wnt3, sox10, mitfa, tyrp1a, tyrp1b, tryp2, and oca2 gene in 72 hpf embryos and decreased tyrosinase activities in embryos at 48 and 72 hpf. The transcriptional activities of myosin VAa, kif5ba, rab27a, mlpha, and cdc42 genes, which are associated with intracellular transport process, were also disturbed during zebrafish development. Ultimately, these alterations led to fast spontaneous movement and melanin accumulation deficit in zebrafish embryos upon BDE-47 exposure. Our results provide an important extension for understanding the neurodevelopmental effects of PBDEs and facilitate the comprehensive evaluation of neurotoxicity in embryos.
Collapse
Affiliation(s)
- Juan Zhuang
- Jiangsu Key Laboratory for Eco-Agricultural Biotechnology Around Hongze Lake, Jiangsu Collaborative Innovation Center of Regional Modern Agriculture and Environmental Protection, Jiangsu Engineering Laboratory for Breeding of Special Aquatic Organisms, Huaiyin Normal University, 111 Changjiang West Road, Huaian, 223300, Jiangsu, China.
| | - Zheng-Jun Pan
- Jiangsu Key Laboratory for Eco-Agricultural Biotechnology Around Hongze Lake, Jiangsu Collaborative Innovation Center of Regional Modern Agriculture and Environmental Protection, Jiangsu Engineering Laboratory for Breeding of Special Aquatic Organisms, Huaiyin Normal University, 111 Changjiang West Road, Huaian, 223300, Jiangsu, China
| | - Ying Qin
- Jiangsu Key Laboratory for Eco-Agricultural Biotechnology Around Hongze Lake, Jiangsu Collaborative Innovation Center of Regional Modern Agriculture and Environmental Protection, Jiangsu Engineering Laboratory for Breeding of Special Aquatic Organisms, Huaiyin Normal University, 111 Changjiang West Road, Huaian, 223300, Jiangsu, China
| | - Hui Liang
- Jiangsu Key Laboratory for Eco-Agricultural Biotechnology Around Hongze Lake, Jiangsu Collaborative Innovation Center of Regional Modern Agriculture and Environmental Protection, Jiangsu Engineering Laboratory for Breeding of Special Aquatic Organisms, Huaiyin Normal University, 111 Changjiang West Road, Huaian, 223300, Jiangsu, China
| | - Wen-Feng Zhang
- Jiangsu Key Laboratory for Eco-Agricultural Biotechnology Around Hongze Lake, Jiangsu Collaborative Innovation Center of Regional Modern Agriculture and Environmental Protection, Jiangsu Engineering Laboratory for Breeding of Special Aquatic Organisms, Huaiyin Normal University, 111 Changjiang West Road, Huaian, 223300, Jiangsu, China
| | - Ze-Yu Sun
- Jiangsu Key Laboratory for Eco-Agricultural Biotechnology Around Hongze Lake, Jiangsu Collaborative Innovation Center of Regional Modern Agriculture and Environmental Protection, Jiangsu Engineering Laboratory for Breeding of Special Aquatic Organisms, Huaiyin Normal University, 111 Changjiang West Road, Huaian, 223300, Jiangsu, China
| | - Han-Bo Shi
- Jiangsu Key Laboratory for Eco-Agricultural Biotechnology Around Hongze Lake, Jiangsu Collaborative Innovation Center of Regional Modern Agriculture and Environmental Protection, Jiangsu Engineering Laboratory for Breeding of Special Aquatic Organisms, Huaiyin Normal University, 111 Changjiang West Road, Huaian, 223300, Jiangsu, China
| |
Collapse
|
6
|
Mandour DA, Tolba AM, El-Bestawy EM. Maternal exposure to the environmental pollutant "BDE-47" impairs the postnatal development of rat cerebellar cortex by modulating neuronal proliferation, synaptogenesis, NGF and BDNF pathways. Histol Histopathol 2022; 37:555-573. [PMID: 35191013 DOI: 10.14670/hh-18-441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
UNLABELLED 2,2',4,4'-Tetrabromodiphenyl ether (BDE-47) is an environmental contaminant that crosses the blood placental barrier and interferes with the homeostasis of fetal thyroid hormones. AIM OF WORK This study was designed to investigate the perinatal effect of BDE-47 exposure on the postnatal development of the rat cerebellar cortex. MATERIALS AND METHODS This study was carried out on 20 pregnant rats and 36 of their offspring. The pregnant rats were divided equally into control and BDE-47 treated mother groups; supplemented orally with BDE-47 (0.2 mg/kg/day from day 8 of gestation until the day of weaning). The offspring of both mother groups were subdivided, according to their developmental age, into three subgroups; PND14, PND21and PND42. SerumT3, T4 and TSH were assessed for dams and their offspring. Testing the motor coordination of the offspring via the rotarod test was conducted. Sections of the cerebellar cortex from offspring subgroups were stained with hematoxylin and eosin alongside immunohistochemical reactions and optical density of nerve growth factor (NGF), brain derived neurotrophic factor (BDNF), proliferating cell nuclear antigen (PCNA) and synaptophysin (SYN). Also, the thickness of different layers of the cerebellar cortex was histomorphometrically measured. RESULTS BDE-47 treated mothers and their offspring subgroups showed a significant decrease in the serum free T3, T4 and increased TSH. The BDE-47 offspring displayed incoordination of the motor activity together with disturbed cytoarchitecture of the cerebellar cortical layers, and impaired migration of its germinative neuronal zones, particularly on PND14 and PND21. Moreover, these offspring displayed a decrease of the immune-expression and optical density of NGF, BDNF in the cerebellar cortical layers with impaired proliferation, and synaptogenesis. CONCLUSION Maternal exposure to BDE-47 during pregnancy and lactation effectuated a potential deleterious retarding effect on the postnatal development of the rat cerebellar cortex mostly via modulating neuronal proliferation, synaptogenesis, NGF and BDNF pathways secondary to its hypothyroid effect.
Collapse
Affiliation(s)
- Dalia A Mandour
- Department of Human Anatomy and Embryology, Faculty of medicine, Zagazig University, Zagazig, Egypt
| | - Asmaa M Tolba
- Department of Human Anatomy and Embryology, Faculty of medicine, Zagazig University, Zagazig, Egypt.
| | - Emtethal M El-Bestawy
- Department of Human Anatomy and Embryology, Faculty of medicine, Zagazig University, Zagazig, Egypt
| |
Collapse
|
7
|
Paliya S, Mandpe A, Bombaywala S, Kumar MS, Kumar S, Morya VK. Polybrominated diphenyl ethers in the environment: a wake-up call for concerted action in India. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:44693-44715. [PMID: 34227009 DOI: 10.1007/s11356-021-15204-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Accepted: 06/25/2021] [Indexed: 06/13/2023]
Abstract
Polybrominated diphenyl ethers (PBDEs) are a class of persistent organic pollutants (POPs) used as flame retardants in the products utilized in day-to-day life. Their bioaccumulation, low volatility, and high persistence in the environment have led to their global spread even to remote and distant regions. The present study identifies gaps in the investigation of the neurotoxic potential of PBDEs, their effects on brain development, toxicokinetic, and their potential as a carcinogen. In India, to date, only human breast milk was assessed for levels of PBDEs, and it is suggested that other human tissues can also be explored. No data on the reproductive toxicity of PBDEs are reported from Indian cohorts. Long-range transport and deposition of PBDEs in colder regions necessitates monitoring of Himalayan regions in India. An inventory of PBDEs is required to be made for addressing the worrisome situation of the unregulated import of E-waste from the developed countries in India. The study also emphasizes providing guidelines for the articulation of policies regarding sound surveillance and management of PBDE production, consumption, and release in the Indian context. It is recommended that a separate cell for monitoring and follow-up of PBDEs should be established in India. Also, the development of better alternatives and environment-friendly remediation technologies for PBDEs is the need of the hour.
Collapse
Affiliation(s)
- Sonam Paliya
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201 002, India
- CSIR-National Environmental Engineering Research Institute (CSIR-NEERI), Nehru Marg, Nagpur, 440 020, India
| | - Ashootosh Mandpe
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201 002, India
- CSIR-National Environmental Engineering Research Institute (CSIR-NEERI), Nehru Marg, Nagpur, 440 020, India
| | - Sakina Bombaywala
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201 002, India
- CSIR-National Environmental Engineering Research Institute (CSIR-NEERI), Nehru Marg, Nagpur, 440 020, India
| | - Manukonda Suresh Kumar
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201 002, India
- CSIR-National Environmental Engineering Research Institute (CSIR-NEERI), Nehru Marg, Nagpur, 440 020, India
| | - Sunil Kumar
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201 002, India.
- CSIR-National Environmental Engineering Research Institute (CSIR-NEERI), Nehru Marg, Nagpur, 440 020, India.
| | - Vivek Kumar Morya
- Adhita Biosciences Pvt. Ltd, SIIC Extension, IIT Kanpur, Kanpur, 208 016, India
| |
Collapse
|
8
|
Gu C, Cai J, Fan X, Bian Y, Yang X, Xia Q, Sun C, Jiang X. Theoretical investigation of AhR binding property with relevant structural requirements for AhR-mediated toxicity of polybrominated diphenyl ethers. CHEMOSPHERE 2020; 249:126554. [PMID: 32213394 DOI: 10.1016/j.chemosphere.2020.126554] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2020] [Revised: 03/16/2020] [Accepted: 03/17/2020] [Indexed: 06/10/2023]
Abstract
Polybrominated diphenyl ethers (PBDEs) are more frequently suspected with the induction of toxicity via signal transduction pathway of cytosolic aryl hydrocarbon receptor (AhR), the initial binding to which is assumed to be an essential prerequisite during the ligand-dependent activation. However, the AhR binding property and associated toxicity of PBDEs is yet to be clearly known for lacking insights into the structural requirements at molecular level. To understand the AhR binding property of PBDEs, the ligand binding domain (LBD) of AhR was simulatively developed on homologous protein after basic validation of geometrical rationality and the binding interaction profile was visually described using molecular docking approach. For AhR binding, the offset or edge-on π-π stackings with aromatic motifs including Phe289, Phe345 and His285 were shown to be structurally required whereas the electrostatic attraction validated for AhR binding to dioxins might be less effective for 2,2',3,4,4'-pentabromodiphenyl ether (BDE-85). Besides the demands of less steric hindrance from alanines and weak formulation of hydrogen bonds, the dispersion force through large contact and polarization of S-π electrons seemed to be impactful when BDE-85 were closer to Cys327, Met334 or Met342. With theoretical computation of AhR binding energies, the more significant correlativity with bioassays was derived especially for the lowly/moderately brominated congeners, and could be used to predict the AhR binding affinity on certain degree. The informative results would thus not only help well understand the molecular basis of AhR-mediated toxicity but give an approach for accelerative evaluation of AhR binding and toxicity of PBDEs.
Collapse
Affiliation(s)
- Chenggang Gu
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, PR China.
| | - Jun Cai
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, PR China; University of the Chinese Academy of Sciences, Beijing, 100049, PR China
| | - Xiuli Fan
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, PR China; University of the Chinese Academy of Sciences, Beijing, 100049, PR China
| | - Yongrong Bian
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, PR China
| | - Xinglun Yang
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, PR China
| | - Qiying Xia
- Shandong Province Key Laboratory of Soil Conservation and Environmental Protection, Linyi University, Linyi, 276005, PR China.
| | - Cheng Sun
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing, 210023, PR China
| | - Xin Jiang
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, PR China.
| |
Collapse
|
9
|
Wang C, Zhu J, Zhang Z, Chen H, Ji M, Chen C, Hu Y, Yu Y, Xia R, Shen J, Gong X, Wang SL. Rno-miR-224-5p contributes to 2,2',4,4'-tetrabromodiphenyl ether-induced low triiodothyronine in rats by targeting deiodinases. CHEMOSPHERE 2020; 246:125774. [PMID: 31901531 DOI: 10.1016/j.chemosphere.2019.125774] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Revised: 12/24/2019] [Accepted: 12/27/2019] [Indexed: 06/10/2023]
Abstract
Hypothyroidism is commonly associated with substantial adverse impacts on human health, and polybrominated diphenyl ether (PBDE), a kind of classic thyroid hormone disruptor, was speculated to be a potential environmental factor, but its effect on thyroxine metabolism has received little attention. In the present study, we investigated the role and mechanism of rno-miR-224-5p in deiodinase-mediated thyroxine metabolism in rats treated with 2,2',4,4'-tetrabromodiphenyl ether (BDE47), a predominant PBDE congener in humans. BDE47 decreased plasma triiodothyronine (T3) and thyroxine (T4) and increased reverse T3 (rT3) in the rats, and the expression of type 1 deiodinase (DIO1) and type 3 deiodinase (DIO3) increased in both the rats and H4-II-E cells. Rno-miR-224-5p was predicted to target dio1 instead of dio3, according to the TargetScan, miRmap.org and microRNA.org databases. Experiments showed that the rno-miR-224-5p level was decreased by BDE47 in a dose-dependent manner and confirmed that rno-miR-224-5p downregulated both DIO1 and DIO3 in the H4-II-E cells and in the rats, as determined using mimics and an inhibitor of rno-miR-224-5p. Furthermore, DIO1 was observed to be a direct functional target of rno-miR-224-5p, whereas DIO3 was indirectly regulated by rno-miR-224-5p via the phosphorylation of the MAPK/ERK (but not p38 or JNK) pathway. Reportedly, DIO1 and DIO3 act principally as inner-ring deiodinases and are responsible for the conversion of T4 to rT3, but not to T3, and the final clearance of thyroxine (mainly in the form of T2). Our results demonstrated that BDE47 induced low levels of T3 conversion through DIO1 and DIO3, which were regulated by rno-miR-224-5p. The findings suggest a novel additional mechanism of PBDE-induced thyroxine metabolism disorder that differs from that of PBDEs as environmental thyroid disruptors.
Collapse
Affiliation(s)
- Chao Wang
- State Key Lab of Reproductive Medicine, Institute of Toxicology, Nanjing Medical University, 101 Longmian Avenue, Nanjing, 211166, PR China; Key Lab of Modern Toxicology of Ministry of Education, Center for Global Health, School of Public Health, Nanjing Medical University, 101 Longmian Avenue, Nanjing, 211166, PR China
| | - Jiansheng Zhu
- State Key Lab of Reproductive Medicine, Institute of Toxicology, Nanjing Medical University, 101 Longmian Avenue, Nanjing, 211166, PR China; Key Lab of Modern Toxicology of Ministry of Education, Center for Global Health, School of Public Health, Nanjing Medical University, 101 Longmian Avenue, Nanjing, 211166, PR China
| | - Zhan Zhang
- Key Lab of Modern Toxicology of Ministry of Education, Center for Global Health, School of Public Health, Nanjing Medical University, 101 Longmian Avenue, Nanjing, 211166, PR China
| | - Hang Chen
- Key Lab of Modern Toxicology of Ministry of Education, Center for Global Health, School of Public Health, Nanjing Medical University, 101 Longmian Avenue, Nanjing, 211166, PR China
| | - Minghui Ji
- Key Lab of Modern Toxicology of Ministry of Education, Center for Global Health, School of Public Health, Nanjing Medical University, 101 Longmian Avenue, Nanjing, 211166, PR China
| | - Chao Chen
- Key Lab of Modern Toxicology of Ministry of Education, Center for Global Health, School of Public Health, Nanjing Medical University, 101 Longmian Avenue, Nanjing, 211166, PR China
| | - Yuhuan Hu
- State Key Lab of Reproductive Medicine, Institute of Toxicology, Nanjing Medical University, 101 Longmian Avenue, Nanjing, 211166, PR China; Key Lab of Modern Toxicology of Ministry of Education, Center for Global Health, School of Public Health, Nanjing Medical University, 101 Longmian Avenue, Nanjing, 211166, PR China
| | - Yongquan Yu
- State Key Lab of Reproductive Medicine, Institute of Toxicology, Nanjing Medical University, 101 Longmian Avenue, Nanjing, 211166, PR China; Key Lab of Modern Toxicology of Ministry of Education, Center for Global Health, School of Public Health, Nanjing Medical University, 101 Longmian Avenue, Nanjing, 211166, PR China
| | - Rong Xia
- Key Lab of Modern Toxicology of Ministry of Education, Center for Global Health, School of Public Health, Nanjing Medical University, 101 Longmian Avenue, Nanjing, 211166, PR China
| | - Jiemiao Shen
- Key Lab of Modern Toxicology of Ministry of Education, Center for Global Health, School of Public Health, Nanjing Medical University, 101 Longmian Avenue, Nanjing, 211166, PR China
| | - Xing Gong
- State Key Lab of Reproductive Medicine, Institute of Toxicology, Nanjing Medical University, 101 Longmian Avenue, Nanjing, 211166, PR China; Key Lab of Modern Toxicology of Ministry of Education, Center for Global Health, School of Public Health, Nanjing Medical University, 101 Longmian Avenue, Nanjing, 211166, PR China
| | - Shou-Lin Wang
- State Key Lab of Reproductive Medicine, Institute of Toxicology, Nanjing Medical University, 101 Longmian Avenue, Nanjing, 211166, PR China; Key Lab of Modern Toxicology of Ministry of Education, Center for Global Health, School of Public Health, Nanjing Medical University, 101 Longmian Avenue, Nanjing, 211166, PR China.
| |
Collapse
|
10
|
Agarwal P, Brockman JD, Wang Y, Schneider JA, Morris MC. Brain Bromine Levels Associated with Alzheimer's Disease Neuropathology. J Alzheimers Dis 2020; 73:327-332. [PMID: 31771054 PMCID: PMC10964729 DOI: 10.3233/jad-190646] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND Bromine is a naturally occurring element that is widely present in the human environment in various chemical forms primarily as flame retardants, pesticides, and water treatments. OBJECTIVE In this exploratory study, we investigated the association of brain bromine concentrations on Alzheimer's disease (AD) neuropathology, cerebral infarcts, and Lewy bodies. METHODS The study was conducted in 215 deceased participants of the Memory and Aging Project, a clinical-pathologic cohort study. Brain bromine levels were measured using instrumental neutron activation analysis. Multiple brain regions were assessed for diffuse and neuritic plaques, neurofibrillary tangles, cerebral macro-and microinfarcts, and Lewy bodies. Standardized measures of AD pathology (Braak, CERAD, NIA-Reagan, global AD pathology) were computed. RESULTS In linear regression models, the higher brain bromine levels were associated with more AD neuropathology (Braak (p trend = 0.01); CERAD (p trend = 0.02); NIA-Reagan (p trend = 0.02). CONCLUSION Bromine accumulation in the brain is associated with higher level of AD neuropathology. The potential deleterious effects of this element on AD need further exploration.
Collapse
Affiliation(s)
- Puja Agarwal
- Department of Internal Medicine, Rush University Medical Center, Chicago, IL, USA
| | | | - Yamin Wang
- Department of Internal Medicine, Rush University Medical Center, Chicago, IL, USA
| | - Julie A. Schneider
- Rush Alzheimer’s Disease Center and Department of Neurological Sciences, Rush University Medical Center, Chicago, IL, USA
| | - Martha C. Morris
- Department of Internal Medicine, Rush University Medical Center, Chicago, IL, USA
| |
Collapse
|
11
|
Dong L, Li P, Yang K, Liu L, Gao H, Zhou G, Zhao Q, Xia T, Wang A, Zhang S. Promotion of mitochondrial fusion protects against developmental PBDE-47 neurotoxicity by restoring mitochondrial homeostasis and suppressing excessive apoptosis. Am J Cancer Res 2020; 10:1245-1261. [PMID: 31938063 PMCID: PMC6956817 DOI: 10.7150/thno.40060] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2019] [Accepted: 11/02/2019] [Indexed: 12/15/2022] Open
Abstract
Polybrominated diphenyl ethers (PBDEs)-induced neurotoxicity is closely associated with mitochondrial abnormalities. Mitochondrial fusion and fission dynamics are required for the maintenance of mitochondrial homeostasis. However, little is known about how PBDEs disrupt this dynamics and whether such disruption contributes to impaired neurodevelopment. Methods: We investigated the effects of 2, 2', 4, 4'-tetrabromodiphenyl ether (PBDE-47), the dominant congener in human samples, on mitochondrial fusion and fission dynamics using PC12 cells, a well-defined in vitro neurodevelopmental model. We also evaluated the effects of perinatal low-dose PBDE-47 exposure on hippocampal mitochondrial dynamics and its association with neurobehavioral changes in adult Sprague-Dawley rats. Results: In vitro, PBDE-47 disrupted mitochondrial dynamics by inhibiting mitochondrial fusion and fission simultaneously, accompanied by mitochondrial fragmentation, membrane potential dissipation, ATP loss, and apoptosis activation. Specifically, enhancing mitochondrial fusion by the chemical promoter M1 or adenovirus-mediated mitofusin 2 (Mfn2) overexpression rescued PBDE-47-caused mitochondrial dynamic, morphological and functional impairments, prevented the resultant apoptosis and promoted neuronal survival. Unexpectedly, either stimulating mitochondrial fission by adenovirus-mediated fission protein 1 (Fis1) overexpression or suppressing mitochondrial fission by the mitochondrial division inhibitor-1 (Mdivi-1) failed to reverse whereas aggravated PBDE-47-induced mitochondrial damage and neuronal death. Importantly, promoting mitochondrial fusion by Mfn2 overexpression neutralized the detrimental effects elicited by Fis1 overexpression after PBDE-47 treatment. Finally, perinatal oral administration of PBDE-47 elicited neurobehavioral deficits and hippocampal neuronal loss via apoptosis in adult rats, which were associated with mitochondrial dynamics alterations manifested as a fragmented phenotype. Conclusion: Our results suggest that PBDE-47 disrupts mitochondrial dynamics to induce mitochondrial abnormalities, triggering apoptosis and thus contributing to neuronal loss and subsequent neurobehavioral deficits. Targeting mitochondrial fusion may be a promising therapeutic intervention against PBDE-47 neurotoxicity.
Collapse
|
12
|
Wang C, Yang L, Hu Y, Zhu J, Xia R, Yu Y, Shen J, Zhang Z, Wang SL. Isoliquiritigenin as an antioxidant phytochemical ameliorates the developmental anomalies of zebrafish induced by 2,2',4,4'-tetrabromodiphenyl ether. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 666:390-398. [PMID: 30802654 DOI: 10.1016/j.scitotenv.2019.02.272] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Revised: 02/16/2019] [Accepted: 02/17/2019] [Indexed: 06/09/2023]
Abstract
2,2',4,4'-Tetrabromodiphenyl ether (BDE47) is the most abundant PBDE congeners in biological samples. It has strong tendencies to bioaccumulate and potentially endangers development of mammals through oxidative stress. Isoliquiritigenin (ISL), an emerging natural chalcone-type flavonoid, possesses various biological and pharmacological properties, including antioxidant, anti-allergic, anti-inflammatory, anti-tumor and estrogenic activities. The purpose of the study is to explore the antioxidant effect of ISL on the amelioration of developmental anomalies induced by BDE47. Zebrafish (Danio rerio) embryos were exposed to BDE47 (1 and 10 μM) and/or ISL (4 μM) for 4 to 120 hours post fertilization (hpf), and the morphology, development, behavior, oxidative stress status and related genes expression were assessed. The results showed that BDE47 contributed to dose-dependent growth retardation and deformities, including delayed hatching, spinal curvature, reduced body length, increased death rate, aberrant behaviors and impaired dark-adapted vision, which were significantly mitigated by ISL. Besides, ISL ameliorated excessive ROS accumulation, and exaggerated the expressions of apoptosis-related genes p53, Bcl-2, caspase 3 and caspase 9 induced by BDE47, suggesting that ISL protected zebrafish from the developmental toxicity of BDE47 by inactivation of programmed apoptosis and activation of antioxidant signaling pathways. Taken together, developing ISL as a dietary supplement might be a promising preventive strategy for the amelioration of developmental toxicity induced by environmental pollutants.
Collapse
Affiliation(s)
- Chao Wang
- State Key Lab of Reproductive Medicine, Institute of Toxicology, Nanjing Medical University, 101 Longmian Avenue, Nanjing 211166, PR China; Key Lab of Modern Toxicology of Ministry of Education, Center for Global Health, School of Public Health, Nanjing Medical University, 101 Longmian Avenue, Nanjing 211166, PR China
| | - Lu Yang
- State Key Lab of Reproductive Medicine, Institute of Toxicology, Nanjing Medical University, 101 Longmian Avenue, Nanjing 211166, PR China
| | - Yuhuan Hu
- State Key Lab of Reproductive Medicine, Institute of Toxicology, Nanjing Medical University, 101 Longmian Avenue, Nanjing 211166, PR China; Key Lab of Modern Toxicology of Ministry of Education, Center for Global Health, School of Public Health, Nanjing Medical University, 101 Longmian Avenue, Nanjing 211166, PR China
| | - Jiansheng Zhu
- State Key Lab of Reproductive Medicine, Institute of Toxicology, Nanjing Medical University, 101 Longmian Avenue, Nanjing 211166, PR China; Key Lab of Modern Toxicology of Ministry of Education, Center for Global Health, School of Public Health, Nanjing Medical University, 101 Longmian Avenue, Nanjing 211166, PR China
| | - Rong Xia
- Key Lab of Modern Toxicology of Ministry of Education, Center for Global Health, School of Public Health, Nanjing Medical University, 101 Longmian Avenue, Nanjing 211166, PR China
| | - Yongquan Yu
- State Key Lab of Reproductive Medicine, Institute of Toxicology, Nanjing Medical University, 101 Longmian Avenue, Nanjing 211166, PR China; Key Lab of Modern Toxicology of Ministry of Education, Center for Global Health, School of Public Health, Nanjing Medical University, 101 Longmian Avenue, Nanjing 211166, PR China
| | - Jiemiao Shen
- Key Lab of Modern Toxicology of Ministry of Education, Center for Global Health, School of Public Health, Nanjing Medical University, 101 Longmian Avenue, Nanjing 211166, PR China
| | - Zhan Zhang
- Key Lab of Modern Toxicology of Ministry of Education, Center for Global Health, School of Public Health, Nanjing Medical University, 101 Longmian Avenue, Nanjing 211166, PR China
| | - Shou-Lin Wang
- State Key Lab of Reproductive Medicine, Institute of Toxicology, Nanjing Medical University, 101 Longmian Avenue, Nanjing 211166, PR China; Key Lab of Modern Toxicology of Ministry of Education, Center for Global Health, School of Public Health, Nanjing Medical University, 101 Longmian Avenue, Nanjing 211166, PR China.
| |
Collapse
|
13
|
Dorman DC, Chiu W, Hales BF, Hauser R, Johnson KJ, Mantus E, Martel S, Robinson KA, Rooney AA, Rudel R, Sathyanarayana S, Schantz SL, Waters KM. Polybrominated diphenyl ether (PBDE) neurotoxicity: a systematic review and meta-analysis of animal evidence. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART B, CRITICAL REVIEWS 2018; 21:269-289. [PMID: 30352012 PMCID: PMC6786272 DOI: 10.1080/10937404.2018.1514829] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
A recent systematic review (SR) and meta-analysis of human studies found an association between prenatal serum polybrominated diphenyl ethers (PBDE) concentrations and a decrease in the IQ of children. A SR of experimental developmental animal PBDE-mediated neurotoxicity studies was performed in the present study. Outcomes assessed included measures related to learning, memory, and attention, which parallel the intelligence-related outcomes evaluated in the human studies SR. PubMed, Embase, and Toxline were searched for relevant experimental non-human mammalian studies. Evaluation of risk of bias (RoB) and overall body of evidence followed guidance developed by the National Toxicology Program. Animal studies using varying designs and outcomes were available for BDEs 47, 99, 153, 203, 206, and 209 and the technical mixture DE-71. Study reporting of methods and results was often incomplete leading to concerns regarding RoB. A meta-analysis of 6 Morris water maze studies showed evidence of a significant increase in last trial latency (effect size of 25.8 [CI, 20.3 to 31.2]) in PBDE-exposed animals with low heterogeneity. For most endpoints, there were unexplained inconsistencies across studies and no consistent evidence of a dose-response relationship. There is a "moderate" level of evidence that exposure to BDEs 47, 99, and 209 affects learning. For other PBDEs and other endpoints, the level of evidence was "low" or "very low". The meta-analysis led to stronger conclusions than that based upon a qualitative review of the evidence. The SR also identified RoB concerns that might be remedied by better study reporting.
Collapse
Affiliation(s)
- David C. Dorman
- Department of Molecular and Biomedical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC, USA
| | - Weihsueh Chiu
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine, Texas A&M University, College Station, TX, USA
| | - Barbara F. Hales
- Department of Pharmacology and Therapeutics, McGill University, Montreal, Quebec, Canada
| | - Russ Hauser
- Department of Environmental Health and Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, MA, USA
| | - Kamin J. Johnson
- Predictive Safety Center, Corteva Agriscience™, Agriculture Division of DowDuPont™, Indianapolis, IN, USA
| | - Ellen Mantus
- Board on Environmental Studies and Toxicology at the National Academies of Sciences, Engineering, and Medicine, Washington DC, USA
| | - Susan Martel
- Board on Environmental Studies and Toxicology at the National Academies of Sciences, Engineering, and Medicine, Washington DC, USA
| | - Karen A. Robinson
- Department of Medicine, Johns Hopkins University, Baltimore, MD, USA
| | - Andrew A. Rooney
- Office of Health Assessment and Translation, Division of the National Toxicology Program, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, NC, USA
| | | | - Sheela Sathyanarayana
- Department of Pediatrics, University of Washington, Seattle Children’s Research Institute, Seattle WA, USA
| | - Susan L. Schantz
- Department of Comparative Biosciences, College of Veterinary Medicine and Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Katrina M. Waters
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, USA
| |
Collapse
|
14
|
Ishibashi H, Kim EY, Arizono K, Iwata H. In Vitro Assessment of Activation of Baikal Seal ( Pusa sibirica) Peroxisome Proliferator-Activated Receptor α by Polybrominated Diphenyl Ethers. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:11831-11837. [PMID: 30212190 DOI: 10.1021/acs.est.8b02501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We investigated the Baikal seal ( Pusa sibirica) peroxisome proliferator-activated receptor α (bsPPARα) transactivation potencies of polybrominated diphenyl ethers (PBDEs) using an in vitro bsPPARα reporter gene assay. BDE47, BDE99, and BDE153 induced bsPPARα-mediated transcriptional activities in a dose-dependent manner. To compare bsPPARα transactivation potencies of PBDEs, perfluorooctanoic acid (PFOA)-based relative potencies (REPs), a ratio of 50% effective concentration of PFOA to the test chemical, were determined. The order of REPs of PBDEs was BDE153 (13) > BDE99 (8.1) > BDE47 (6.6) > PFOA (1.0) > BDE100, BDE154, and BDE183 (not activated). PBDEs with two bromine atoms at the ortho position showed higher bsPPARα transactivation potencies than those with three bromine atoms. Comparison of the lowest-observed-effect concentration in bsPPARα reporter gene assays revealed that BDE99 was 7-fold more potent than CB99, a polychlorinated biphenyl congener with the same IUPAC number, indicating that brominated congeners could more efficiently activate bsPPARα than chlorinated congeners. The REPs of PBDEs for bsPPARα transactivation were approximately 7- to 13-fold higher than those of perfluorochemicals (PFCs), suggesting that the effects of PBDEs on the bsPPARα signaling pathway may be superior to those of PFCs. This study provides the first evidence that PBDE congeners activate PPARα in vitro.
Collapse
Affiliation(s)
- Hiroshi Ishibashi
- Center for Marine Environmental Studies (CMES) , Ehime University , Bunkyo-cho 2-5 , Matsuyama 790-8577 , Japan
- Graduate School of Agriculture , Ehime University , 3-5-7 Tarumi , Matsuyama 790-8566 , Japan
| | - Eun-Young Kim
- Department of Life and Nanopharmaceutical Science and Department of Biology , Kyung Hee University , Hoegi-Dong, Dongdaemun-Gu , Seoul 130-701 , Korea
| | - Koji Arizono
- Faculty of Environmental and Symbiotic Sciences , Prefectural University of Kumamoto , 3-1-100 Tsukide, Higashi-ku , Kumamoto 862-8502 , Japan
| | - Hisato Iwata
- Center for Marine Environmental Studies (CMES) , Ehime University , Bunkyo-cho 2-5 , Matsuyama 790-8577 , Japan
| |
Collapse
|
15
|
Chen L, Hu C, Lok-Shun Lai N, Zhang W, Hua J, Lam PKS, Lam JCW, Zhou B. Acute exposure to PBDEs at an environmentally realistic concentration causes abrupt changes in the gut microbiota and host health of zebrafish. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2018; 240:17-26. [PMID: 29729565 DOI: 10.1016/j.envpol.2018.04.062] [Citation(s) in RCA: 81] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2017] [Revised: 04/03/2018] [Accepted: 04/14/2018] [Indexed: 06/08/2023]
Abstract
Contamination from lower brominated PBDEs is ubiquitous in the environments. However, their effects on gut microbiota and intestinal health have not yet been investigated. This study exposed adult zebrafish to an environmentally realistic concentration of pentaBDE mixture (DE-71) at 5.0 ng/L for 7 days, after which metagenomic sequencing of the intestinal microbiome was conducted and host physiological activities in the intestine and liver were also examined. The results showed that acute exposure to DE-71 significantly shifted the gut microbial community in a sex-specific manner. Certain genera (e.g., Mycoplasma, Ruminiclostridium, unclassified Firmicutes sensu stricto, and Fusobacterium) disappeared from the DE-71-exposed intestines, resulting in decreased bacterial diversity. Bacterial metabolic functions in guts were also affected by DE-71, namely those covering energy metabolism, virulence, respiration, cell division, cell signaling, and stress response. In addition, measurement of diverse sensitive biomarkers showed that the health of male intestines was remarkably compromised by the DE-71 exposure, as indicated by the disruption to its neural signaling (serotonin), epithelial barrier integrity (tight junction protein 2), inflammatory response (interleukin 1β), oxidative stress and antioxidant capacity, as well as detoxifying potential (ethoxyresorufin-O-deethylase activity). However, female intestines maintained intact physiological activities. Compared to the direct impact on intestines, a latent effect of DE-71 was observed in livers. Co-occurrence network analysis demonstrated that the gut bacteria vigorously interacted to establish the fittest community under DE-71 stress by promoting the reproduction of favorable genera, while diminishing the survival of unfavorable ones. Significant correlations between the zebrafish gut microbiota and physiological activities (e.g., oxidative stress, detoxification, neurotransmission, and epithelial integrity) were also observed. Overall, this study has demonstrated, for the first time, the high susceptibility of gut microbiota and intestinal health of zebrafish to DE-71, thus warranting more work to reveal its mode of toxicity.
Collapse
Affiliation(s)
- Lianguo Chen
- State Key Laboratory in Marine Pollution, City University of Hong Kong, Kowloon, Hong Kong SAR, China; State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China
| | - Chenyan Hu
- School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan, 430072, China
| | - Nelson Lok-Shun Lai
- State Key Laboratory in Marine Pollution, City University of Hong Kong, Kowloon, Hong Kong SAR, China
| | - Weipeng Zhang
- Division of Life Science, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China
| | - Jianghuan Hua
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China
| | - Paul K S Lam
- State Key Laboratory in Marine Pollution, City University of Hong Kong, Kowloon, Hong Kong SAR, China
| | - James C W Lam
- State Key Laboratory in Marine Pollution, City University of Hong Kong, Kowloon, Hong Kong SAR, China; Department of Science and Environmental Studies, The Education University of Hong Kong, Hong Kong SAR, China.
| | - Bingsheng Zhou
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China.
| |
Collapse
|
16
|
Zhuang J, Wang S, Shan Q, Zhang ZF, Li MQ, Zheng GH, Fan SH, Wu DM, Hu B, Lu J, Zheng YL. Adeno-associated virus vector-mediated expression of DJ-1 attenuates learning and memory deficits in 2, 2´, 4, 4´-tetrabromodiphenyl ether (BDE-47)-treated mice. JOURNAL OF HAZARDOUS MATERIALS 2018; 347:390-402. [PMID: 29335220 DOI: 10.1016/j.jhazmat.2018.01.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2017] [Revised: 12/18/2017] [Accepted: 01/03/2018] [Indexed: 06/07/2023]
Abstract
Evidence indicates that oxidative stress is the central pathological feature of 2, 2´, 4, 4´-tetrabromodiphenyl ether (BDE-47)-induced neurotoxicity. Protein kinase C delta (PKCδ), an oxidative stress-sensitive kinase, can be proteolytically cleaved to yield a catalytically active fragment (PKCδ-CF) that is involved in various neurodegenerative disorders. Here, we showed that BDE-47 treatment increased ROS, malondialdehyde, and protein carbonyl levels in the mouse hippocampus. In turn, excessive ROS induced caspase-3-dependent PKCδ activation and stimulated NF-κB p65 nuclear translocation, resulting in inflammation in the mouse hippocampus. These changes caused learning and memory deficits in BDE-47-treated mice. Treatment with Z-DEVD-fmk, a caspase-3 inhibitor, or N-acetyl-L-cysteine, an antioxidant, blocked PKCδ activation and subsequently inhibited inflammation, thereby improving learning and memory deficits in BDE-47-treated mice. Our data further showed that activation of ROS-PKCδ signaling was associated with DJ-1 downregulation, which exerted neuroprotective effects against oxidative stress induced by different neurotoxic agents. Adeno-associated viral vector-mediated DJ-1 overexpression in the hippocampus effectively inhibited excessive ROS production, suppressed caspase-3-dependent PKCδ cleavage, blunted inflammation and ultimately reversed learning and memory deficits in BDE-47-treated mice. Taken together, our results demonstrate that DJ-1 plays a pivotal role in BDE-47-induced neurotoxic effects and learning and memory deficits.
Collapse
Affiliation(s)
- Juan Zhuang
- School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, Jiangsu Province, China; Key Laboratory for Biotechnology on Medicinal Plants of Jiangsu Province, School of Life Science, Jiangsu Normal University, 101 Shanghai Road, Xuzhou 221116, Jiangsu Province, China; Jiangsu Collaborative Innovation Center of Regional Modern Agriculture & Environmental Protection, Huaiyin Normal University, Huaian 223300, China; Jiangsu Key Laboratory for Eco-Agricultural Biotechnology around Hongze Lake, Huaiyin Normal University, Huaian 223300, China; School of Life Sciences, Huaiyin Normal University, Huaian 223300, China
| | - Shan Wang
- Key Laboratory for Biotechnology on Medicinal Plants of Jiangsu Province, School of Life Science, Jiangsu Normal University, 101 Shanghai Road, Xuzhou 221116, Jiangsu Province, China; College of Health Sciences, Jiangsu Normal University, 101 Shanghai Road, Xuzhou 221116, Jiangsu Province, China
| | - Qun Shan
- School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, Jiangsu Province, China; Key Laboratory for Biotechnology on Medicinal Plants of Jiangsu Province, School of Life Science, Jiangsu Normal University, 101 Shanghai Road, Xuzhou 221116, Jiangsu Province, China; College of Health Sciences, Jiangsu Normal University, 101 Shanghai Road, Xuzhou 221116, Jiangsu Province, China
| | - Zi-Feng Zhang
- Key Laboratory for Biotechnology on Medicinal Plants of Jiangsu Province, School of Life Science, Jiangsu Normal University, 101 Shanghai Road, Xuzhou 221116, Jiangsu Province, China; College of Health Sciences, Jiangsu Normal University, 101 Shanghai Road, Xuzhou 221116, Jiangsu Province, China
| | - Meng-Qiu Li
- Key Laboratory for Biotechnology on Medicinal Plants of Jiangsu Province, School of Life Science, Jiangsu Normal University, 101 Shanghai Road, Xuzhou 221116, Jiangsu Province, China; College of Health Sciences, Jiangsu Normal University, 101 Shanghai Road, Xuzhou 221116, Jiangsu Province, China
| | - Gui-Hong Zheng
- Key Laboratory for Biotechnology on Medicinal Plants of Jiangsu Province, School of Life Science, Jiangsu Normal University, 101 Shanghai Road, Xuzhou 221116, Jiangsu Province, China; College of Health Sciences, Jiangsu Normal University, 101 Shanghai Road, Xuzhou 221116, Jiangsu Province, China
| | - Shao-Hua Fan
- Key Laboratory for Biotechnology on Medicinal Plants of Jiangsu Province, School of Life Science, Jiangsu Normal University, 101 Shanghai Road, Xuzhou 221116, Jiangsu Province, China; College of Health Sciences, Jiangsu Normal University, 101 Shanghai Road, Xuzhou 221116, Jiangsu Province, China
| | - Dong-Mei Wu
- Key Laboratory for Biotechnology on Medicinal Plants of Jiangsu Province, School of Life Science, Jiangsu Normal University, 101 Shanghai Road, Xuzhou 221116, Jiangsu Province, China; College of Health Sciences, Jiangsu Normal University, 101 Shanghai Road, Xuzhou 221116, Jiangsu Province, China.
| | - Bin Hu
- Key Laboratory for Biotechnology on Medicinal Plants of Jiangsu Province, School of Life Science, Jiangsu Normal University, 101 Shanghai Road, Xuzhou 221116, Jiangsu Province, China; College of Health Sciences, Jiangsu Normal University, 101 Shanghai Road, Xuzhou 221116, Jiangsu Province, China
| | - Jun Lu
- Key Laboratory for Biotechnology on Medicinal Plants of Jiangsu Province, School of Life Science, Jiangsu Normal University, 101 Shanghai Road, Xuzhou 221116, Jiangsu Province, China; College of Health Sciences, Jiangsu Normal University, 101 Shanghai Road, Xuzhou 221116, Jiangsu Province, China.
| | - Yuan-Lin Zheng
- Key Laboratory for Biotechnology on Medicinal Plants of Jiangsu Province, School of Life Science, Jiangsu Normal University, 101 Shanghai Road, Xuzhou 221116, Jiangsu Province, China; College of Health Sciences, Jiangsu Normal University, 101 Shanghai Road, Xuzhou 221116, Jiangsu Province, China.
| |
Collapse
|
17
|
Li M, Huo X, Pan Y, Cai H, Dai Y, Xu X. Proteomic evaluation of human umbilical cord tissue exposed to polybrominated diphenyl ethers in an e-waste recycling area. ENVIRONMENT INTERNATIONAL 2018; 111:362-371. [PMID: 29169793 DOI: 10.1016/j.envint.2017.09.016] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2017] [Revised: 08/17/2017] [Accepted: 09/19/2017] [Indexed: 02/05/2023]
Abstract
Parental exposure to polybrominated diphenyl ethers (PBDEs) is associated with adverse birth outcomes. This study aims to examine differentially-expressed protein profiles in umbilical cord tissue, derived from mothers exposed to PBDEs, and investigate candidate biomarkers to reveal the underlying molecular mechanisms. Umbilical cord samples were obtained from women residing in an electronic waste (e-waste) recycling area (Guiyu) and reference area (Haojiang) in China. The concentration of PBDEs in umbilical cord tissue was determined by gas chromatography and mass spectrometry (GC/MS). Isobaric tagging for relative and absolute quantification (iTRAQ)-based proteomic technology was conducted to analyze differentially-expressed protein profiles. The total PBDE concentration was approximately five-fold higher in umbilical cords from Guiyu than from Haojiang (median 71.92ng/g vs. 15.52ng/g lipid, P<0.01). Neonatal head circumference, body-mass index (BMI) and Apgar1 score were lower in Guiyu and negatively correlated with PBDE concentration (P<0.01). Proteomic analysis showed 697 proteins were differentially expressed in the e-waste-exposed group compared with the reference group. The differentially-expressed proteins were principally involved in antioxidant defense, apoptosis, cell structure and metabolism. Among them, catalase and glutathione S-transferase omega-1, were down-regulated, and cytochrome c was found to be up-regulated, changes which were further verified by enzyme-linked immunosorbent assays. These results suggest that an antioxidant imbalance and cell apoptosis in the umbilical cord following PBDE exposure is associated with neonatal birth outcomes.
Collapse
Affiliation(s)
- Minghui Li
- Laboratory of Environmental Medicine and Developmental Toxicology, Guangdong Provincial Key Laboratory of Infectious Diseases and Molecular Immunopathology, Shantou University Medical College, Shantou 515041, Guangdong, China
| | - Xia Huo
- Laboratory of Environmental Medicine and Developmental Toxicology, Guangzhou Key Laboratory of Environmental Exposure and Health, School of Environment, Jinan University, Guangzhou 510632, China
| | - Yukui Pan
- Laboratory of Environmental Medicine and Developmental Toxicology, Guangdong Provincial Key Laboratory of Infectious Diseases and Molecular Immunopathology, Shantou University Medical College, Shantou 515041, Guangdong, China
| | - Haoxing Cai
- Laboratory of Environmental Medicine and Developmental Toxicology, Guangdong Provincial Key Laboratory of Infectious Diseases and Molecular Immunopathology, Shantou University Medical College, Shantou 515041, Guangdong, China
| | - Yifeng Dai
- Laboratory of Environmental Medicine and Developmental Toxicology, Guangdong Provincial Key Laboratory of Infectious Diseases and Molecular Immunopathology, Shantou University Medical College, Shantou 515041, Guangdong, China
| | - Xijin Xu
- Laboratory of Environmental Medicine and Developmental Toxicology, Guangdong Provincial Key Laboratory of Infectious Diseases and Molecular Immunopathology, Shantou University Medical College, Shantou 515041, Guangdong, China; Department of Cell Biology and Genetics, Shantou University Medical College, Shantou 515041, China.
| |
Collapse
|
18
|
Chen H, Streifel KM, Singh V, Yang D, Mangini L, Wulff H, Lein PJ. From the Cover: BDE-47 and BDE-49 Inhibit Axonal Growth in Primary Rat Hippocampal Neuron-Glia Co-Cultures via Ryanodine Receptor-Dependent Mechanisms. Toxicol Sci 2018; 156:375-386. [PMID: 28003438 DOI: 10.1093/toxsci/kfw259] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Polybrominated diphenyl ethers (PBDEs) are widespread environmental contaminants associated with adverse neurodevelopmental outcomes in children and preclinical models; however, the mechanisms by which PBDEs cause developmental neurotoxicity remain speculative. The structural similarity between PBDEs and nondioxin-like (NDL) polychlorinated biphenyls (PCBs) suggests shared toxicological properties. Consistent with this, both NDL PCBs and PBDEs have been shown to stabilize ryanodine receptors (RyRs) in the open configuration. NDL PCB effects on RyR activity are causally linked to increased dendritic arborization, but whether PBDEs similarly enhance dendritic growth is not known. In this study, we quantified the effects of individual PBDE congeners on not only dendritic but also axonal growth since both are regulated by RyR-dependent mechanisms, and both are critical determinants of neuronal connectivity. Neuronal-glial co-cultures dissociated from the neonatal rat hippocampus were exposed to BDE-47 or BDE-49 in the culture medium. At concentrations ranging from 20 pM to 2 µM, neither PBDE congener altered dendritic arborization. In contrast, at concentrations ≥ 200 pM, both congeners delayed neuronal polarization resulting in significant inhibition of axonal outgrowth during the first few days in vitro. The axon inhibitory effects of these PBDE congeners occurred independent of cytotoxicity, and were blocked by pharmacological antagonism of RyR or siRNA knockdown of RyR2. These results demonstrate that the molecular and cellular mechanisms by which PBDEs interfere with neurodevelopment overlap with but are distinct from those of NDL PCBs, and suggest that altered patterns of neuronal connectivity may contribute to the developmental neurotoxicity of PBDEs.
Collapse
Affiliation(s)
- Hao Chen
- Department of Molecular Biosciences, School of Veterinary Medicine
| | - Karin M Streifel
- Department of Molecular Biosciences, School of Veterinary Medicine
| | - Vikrant Singh
- Department of Pharmacology, School of Medicine, University of California-Davis, Davis, California 95616
| | - Dongren Yang
- Department of Molecular Biosciences, School of Veterinary Medicine
| | - Linley Mangini
- Department of Molecular Biosciences, School of Veterinary Medicine
| | - Heike Wulff
- Department of Pharmacology, School of Medicine, University of California-Davis, Davis, California 95616
| | - Pamela J Lein
- Department of Molecular Biosciences, School of Veterinary Medicine
| |
Collapse
|
19
|
Zhuang J, Wen X, Zhang YQ, Shan Q, Zhang ZF, Zheng GH, Fan SH, Li MQ, Wu DM, Hu B, Lu J, Zheng YL. TDP-43 upregulation mediated by the NLRP3 inflammasome induces cognitive impairment in 2 2',4,4'-tetrabromodiphenyl ether (BDE-47)-treated mice. Brain Behav Immun 2017; 65:99-110. [PMID: 28532818 DOI: 10.1016/j.bbi.2017.05.014] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Revised: 05/10/2017] [Accepted: 05/19/2017] [Indexed: 10/19/2022] Open
Abstract
It is now commonly known that exposure to polybrominated diphenyl ethers (PBDEs) may cause neurotoxicity and cognitive deficits in children as well as adults, but the underlying mechanisms are still not clear. In the present study, we aimed to elucidate the potential underlying mechanism of 2,2',4,4'-tetrabromodiphenyl ether (BDE-47)-induced neurotoxicity and cognitive impairment. Our results showed that BDE-47-treated mice exhibited impaired cognition and robust upregulation of nuclear TDP-43 in the hippocampus. Hippocampus-specific TDP-43 knockdown attenuated hippocampal apoptosis, restored synaptic protein levels and thus improved cognitive dysfunction in BDE-47-treated mice. Furthermore, our data demonstrated that NLRP3 inflammasome activation played a distinct role in the upregulation of nuclear TDP-43 by downregulating Parkin in the hippocampus of BDE-47-treated mice. Knocking down NLRP3 in the hippocampus or inhibiting caspase 1 activity in BDE-47-treated mice effectively increased Parkin expression in the hippocampus, which decreased the levels of nuclear TDP-43 and ultimately abrogated TDP-43-induced neurotoxic effects. Taken together, our data indicate that TDP-43 upregulation mediated by NLRP3 inflammasome activation via Parkin downregulation in the hippocampus induces cognitive decline in BDE-47-treated mice, and suggest that inhibition of NLRP3 or TDP-43 may be a potential strategy for the prevention or treatment of cognitive impairment in BDE-47-induced neurotoxicity and brain diseases.
Collapse
Affiliation(s)
- Juan Zhuang
- School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, Jiangsu Province, PR China; Key Laboratory for Biotechnology on Medicinal Plants of Jiangsu Province, School of Life Science, Jiangsu Normal University, 101 Shanghai Road, Xuzhou 221116, Jiangsu Province, PR China; Jiangsu Key Laboratory for Eco-Agricultural Biotechnology around Hongze Lake, School of Life Science, Huaiyin Normal University, 111 Changjiang Road, Huaian 223300, Jiangsu Province, PR China
| | - Xin Wen
- Key Laboratory for Biotechnology on Medicinal Plants of Jiangsu Province, School of Life Science, Jiangsu Normal University, 101 Shanghai Road, Xuzhou 221116, Jiangsu Province, PR China
| | - Yan-Qiu Zhang
- School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, Jiangsu Province, PR China
| | - Qun Shan
- School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, Jiangsu Province, PR China; Key Laboratory for Biotechnology on Medicinal Plants of Jiangsu Province, School of Life Science, Jiangsu Normal University, 101 Shanghai Road, Xuzhou 221116, Jiangsu Province, PR China
| | - Zi-Feng Zhang
- Key Laboratory for Biotechnology on Medicinal Plants of Jiangsu Province, School of Life Science, Jiangsu Normal University, 101 Shanghai Road, Xuzhou 221116, Jiangsu Province, PR China
| | - Gui-Hong Zheng
- Key Laboratory for Biotechnology on Medicinal Plants of Jiangsu Province, School of Life Science, Jiangsu Normal University, 101 Shanghai Road, Xuzhou 221116, Jiangsu Province, PR China
| | - Shao-Hua Fan
- Key Laboratory for Biotechnology on Medicinal Plants of Jiangsu Province, School of Life Science, Jiangsu Normal University, 101 Shanghai Road, Xuzhou 221116, Jiangsu Province, PR China
| | - Meng-Qiu Li
- Key Laboratory for Biotechnology on Medicinal Plants of Jiangsu Province, School of Life Science, Jiangsu Normal University, 101 Shanghai Road, Xuzhou 221116, Jiangsu Province, PR China
| | - Dong-Mei Wu
- Key Laboratory for Biotechnology on Medicinal Plants of Jiangsu Province, School of Life Science, Jiangsu Normal University, 101 Shanghai Road, Xuzhou 221116, Jiangsu Province, PR China
| | - Bin Hu
- Key Laboratory for Biotechnology on Medicinal Plants of Jiangsu Province, School of Life Science, Jiangsu Normal University, 101 Shanghai Road, Xuzhou 221116, Jiangsu Province, PR China
| | - Jun Lu
- Key Laboratory for Biotechnology on Medicinal Plants of Jiangsu Province, School of Life Science, Jiangsu Normal University, 101 Shanghai Road, Xuzhou 221116, Jiangsu Province, PR China.
| | - Yuan-Lin Zheng
- Key Laboratory for Biotechnology on Medicinal Plants of Jiangsu Province, School of Life Science, Jiangsu Normal University, 101 Shanghai Road, Xuzhou 221116, Jiangsu Province, PR China.
| |
Collapse
|
20
|
Zheng S, Liu C, Huang Y, Bao M, Huang Y, Wu K. Effects of 2,2′,4,4′-tetrabromodiphenyl ether on neurobehavior and memory change and bcl-2 , c-fos , grin1b and lingo1b gene expression in male zebrafish ( Danio rerio ). Toxicol Appl Pharmacol 2017; 333:10-16. [PMID: 28807763 DOI: 10.1016/j.taap.2017.08.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Revised: 08/04/2017] [Accepted: 08/10/2017] [Indexed: 02/05/2023]
|
21
|
Krieger LK, Szeitz A, Bandiera SM. Hepatic microsomal metabolism of BDE-47 and BDE-99 by lesser snow geese and Japanese quail. CHEMOSPHERE 2017; 182:559-566. [PMID: 28525869 DOI: 10.1016/j.chemosphere.2017.05.027] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Revised: 05/02/2017] [Accepted: 05/03/2017] [Indexed: 06/07/2023]
Abstract
In the present study, we investigated the oxidative biotransformation of 2,2',4,4'-tetrabromodiphenyl ether (BDE-47) and 2,2',4,4',5-pentabromodiphenyl ether (BDE-99) by liver microsomes from wild lesser snow geese (Chen caerulescens caerulescens) and domesticated Japanese quail (Coturnix japonica). Formation of hydroxy-metabolites was analyzed using an ultra-high performance liquid chromatography-tandem mass spectrometry-based method. Incubation of BDE-47 with avian liver microsomes produced sixteen hydroxy-metabolites, eight of which were identified using authentic standards. The major metabolites formed by liver microsomes from individual lesser snow geese were 4-hydroxy-2,2',3,4'-tetrabromodiphenyl ether (4-OH-BDE-42), 3-hydroxy-2,2',4,4'-tetrabromodiphenyl ether (3-OH-BDE-47), and 4'-hydroxy-2,2',4,5'-tetrabromodiphenyl ether (4'-OH-BDE-49). By comparison, 4-OH-BDE-42 and 4'-OH-BDE-49, but not 3-OH-BDE-47, were major metabolites of Japanese quail liver microsomes. Unidentified metabolites included monohydroxy- and dihydroxy-tetrabromodiphenyl ethers. Incubation of BDE-99 with avian liver microsomes produced seventeen hydroxy-metabolites, twelve of which were identified using authentic standards. The major metabolites formed by lesser snow goose liver microsomes were 2,4,5-tribromophenol, 3-OH-BDE-47, 4'-OH-BDE-49, 4-hydroxy-2,2',3,4',5-pentabromodiphenyl ether (4-OH-BDE-90), and 5'-hydroxy-2,2',4,4',5-pentabromodiphenyl ether (5'-OH-BDE-99). By comparison, the major metabolites produced by liver microsomes from Japanese quail included 6-hydroxy-2,2',4,4'-tetrabromodiphenyl ether (6-OH-BDE-47) and 2-hydroxy-2',3,4,4',5-pentabromodiphenyl ether (2-OH-BDE-123), but not 3-OH-BDE-47. Unidentified metabolites consisted of monohydroxy-pentabromodiphenyl ethers, monohydroxy-tetrabromodiphenyl ethers and dihydroxy-tetrabromodiphenyl ethers. Another difference between the two species was that formation rates of BDE-47 and BDE-99 metabolites were greater with liver microsomes from male than female Japanese quail, but a sex difference was not observed with lesser snow geese.
Collapse
Affiliation(s)
- Lisa K Krieger
- Faculty of Pharmaceutical Sciences, The University of British Columbia, Vancouver, British Columbia, V6T 1Z3, Canada
| | - András Szeitz
- Faculty of Pharmaceutical Sciences, The University of British Columbia, Vancouver, British Columbia, V6T 1Z3, Canada
| | - Stelvio M Bandiera
- Faculty of Pharmaceutical Sciences, The University of British Columbia, Vancouver, British Columbia, V6T 1Z3, Canada.
| |
Collapse
|
22
|
Hu F, Li T, Gong H, Chen Z, Jin Y, Xu G, Wang M. Bisphenol A Impairs Synaptic Plasticity by Both Pre- and Postsynaptic Mechanisms. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2017; 4:1600493. [PMID: 28852612 PMCID: PMC5566242 DOI: 10.1002/advs.201600493] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Revised: 02/10/2017] [Indexed: 05/30/2023]
Abstract
Bisphenol A (BPA), an environmental xenoestrogen, has been reported to induce learning and memory impairments in rodent animals. However, effects of BPA exposure on synaptic plasticity and the underlying physiological mechanisms remain elusive. Our behavioral and electrophysiological analyses show that BPA obviously perturbs hippocampal spatial memory of juvenile Sprague-Dawley rats after four weeks exposure, with significantly impaired long-term potentiation (LTP) in the hippocampus. These effects involve decreased spine density of pyramidal neurons, especially the apical dendritic spine. Further presynaptic findings show an overt inhibition of pulse-paired facilitation during electrophysiological recording, which suggest the decrease of presynaptic transmitter release and is consistent with reduced production of presynaptic glutamate after BPA exposure. Meanwhile, LTP-related glutamate receptors, NMDA receptor 2A (NR2A) and AMPA receptor 1 (GluR1), are significantly downregulated in BPA-exposed rats. Excitatory postsynaptic currents (EPSCs) results also show that EPSCNMDA, but not EPSCAMPA, is declined by 40% compared to the baseline in BPA-perfused brain slices. Taken together, these findings reveal that juvenile BPA exposure has negative effects on synaptic plasticity, which result from decreases in dendritic spine density and excitatory synaptic transmission. Importantly, this study also provides new insights into the dynamics of BPA-induced memory deterioration during the whole life of rats.
Collapse
Affiliation(s)
- Fan Hu
- School of Food Science and EngineeringHefei University of TechnologyHefeiAnhui230009P. R. China
| | - Tingting Li
- School of Food Science and EngineeringHefei University of TechnologyHefeiAnhui230009P. R. China
| | - Huarui Gong
- CAS Key Laboratory of Brain Function and DiseasesSchool of Life SciencesUniversity of Science and Technology of ChinaHefeiAnhui230027P. R. China
| | - Zhi Chen
- School of Food Science and EngineeringHefei University of TechnologyHefeiAnhui230009P. R. China
| | - Yan Jin
- CAS Key Laboratory of Brain Function and DiseasesSchool of Life SciencesUniversity of Science and Technology of ChinaHefeiAnhui230027P. R. China
| | - Guangwei Xu
- CAS Key Laboratory of Brain Function and DiseasesSchool of Life SciencesUniversity of Science and Technology of ChinaHefeiAnhui230027P. R. China
| | - Ming Wang
- CAS Key Laboratory of Brain Function and DiseasesSchool of Life SciencesUniversity of Science and Technology of ChinaHefeiAnhui230027P. R. China
| |
Collapse
|
23
|
Fournier K, Baumont E, Glorennec P, Bonvallot N. Relative toxicity for indoor semi volatile organic compounds based on neuronal death. Toxicol Lett 2017; 279:33-42. [PMID: 28709981 DOI: 10.1016/j.toxlet.2017.07.875] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2016] [Revised: 07/03/2017] [Accepted: 07/09/2017] [Indexed: 11/30/2022]
Abstract
BACKGROUND Semi Volatile Organic Compounds (SVOCs) are contaminants commonly found in dwellings as a result of their use as plasticizers, flame retardants, or pesticides in building materials and consumer products. Many SVOCs are suspected of being neurotoxic, based on mammal experimentation (impairment of locomotor activity, spatial learning/memory or behavioral changes), raising the question of cumulative risk assessment. The aim of this work is to estimate the relative toxicity of such SVOCs, based on neuronal death. METHOD SVOCs fulfilling the following conditions were included: detection frequency >10% in dwellings, availability of data on effects or mechanism of action for neurotoxicity, and availability of dose-response relationships based on cell viability assays as a proxy of neuronal death. Benchmark concentration values (BMC) were estimated using a Hill model, and compared to assess relative toxicity. RESULTS Of the 58 SVOCs selected, 28 were suspected of being neurotoxic in mammals, and 21 have been documented as inducing a decrease in cell viability in vitro. 13 have at least one dose-response relationship that can be used to derive a BMC based on a 10% fall in neuronal viability. Based on this in vitro endpoint, PCB-153 appeared to be the most toxic compound, having the lowest BMC10 (0.072μM) and diazinon the least toxic compound, having the highest BMC10 (94.35μM). We showed that experimental designs (in particular choice of cell lines) had a significant influence on BMC calculation. CONCLUSION For the first time, the relative in vitro toxicity of 13 indoor contaminants belonging to different chemical families has been assessed on the basis of neuronal cell viability. Lack of comparable toxicity datasets limits the number of SVOCs that can be included. More standardized protocols in terms of cell lines, species and exposure duration should be developed with a view to cumulative risk assessment.
Collapse
Affiliation(s)
- Kevin Fournier
- EHESP School of Public Health, Sorbonne Paris Cité, Avenue du Professeur Léon Bernard, 35043 Rennes Cedex, France; INSERM UMR1085 IRSET (Research Institute in Environmental and Occupational Health), Rennes, France.
| | - Emmanuel Baumont
- EHESP School of Public Health, Sorbonne Paris Cité, Avenue du Professeur Léon Bernard, 35043 Rennes Cedex, France; INSERM UMR1085 IRSET (Research Institute in Environmental and Occupational Health), Rennes, France.
| | - Philippe Glorennec
- EHESP School of Public Health, Sorbonne Paris Cité, Avenue du Professeur Léon Bernard, 35043 Rennes Cedex, France; INSERM UMR1085 IRSET (Research Institute in Environmental and Occupational Health), Rennes, France.
| | - Nathalie Bonvallot
- EHESP School of Public Health, Sorbonne Paris Cité, Avenue du Professeur Léon Bernard, 35043 Rennes Cedex, France; INSERM UMR1085 IRSET (Research Institute in Environmental and Occupational Health), Rennes, France.
| |
Collapse
|
24
|
Raymaekers SR, Darras VM. Thyroid hormones and learning-associated neuroplasticity. Gen Comp Endocrinol 2017; 247:26-33. [PMID: 28390960 DOI: 10.1016/j.ygcen.2017.04.001] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/05/2017] [Revised: 03/30/2017] [Accepted: 04/03/2017] [Indexed: 12/11/2022]
Abstract
Thyroid hormones (THs) are crucial for brain development and maturation in all vertebrates. Especially during pre- and perinatal development, disruption of TH signaling leads to a multitude of neurological deficits. Many animal models provided insight in the role of THs in brain development, but specific data on how they affect the brain's ability to learn and adapt depending on environmental stimuli are rather limited. In this review, we focus on a number of learning processes like spatial learning, fear conditioning, vocal learning and imprinting behavior and on how abnormal TH signaling during development shapes subsequent performance. It is clear from multiple studies that TH deprivation leads to defects in learning on all fronts, and interestingly, changes in local expression of the TH activator deiodinase type 2 seem to have an important role. Taking into account that THs are regulated in a very space-specific manner, there is thus increasing pressure to investigate more local TH regulators as potential factors involved in neuroplasticity. As these learning processes are also important for proper adult human functioning, further elucidating the role of THs in developmental neuroplasticity in various animal models is an important field for advancing both fundamental and applied knowledge on human brain function.
Collapse
Affiliation(s)
- Sander R Raymaekers
- Laboratory of Comparative Endocrinology, Biology Department, KU Leuven, Naamsestraat 61, 3000 Leuven, Belgium
| | - Veerle M Darras
- Laboratory of Comparative Endocrinology, Biology Department, KU Leuven, Naamsestraat 61, 3000 Leuven, Belgium.
| |
Collapse
|
25
|
Sun W, Du L, Tang W, Kuang L, Du P, Chen J, Chen D. PBDE-209 exposure damages learning and memory ability in rats potentially through increased autophagy and apoptosis in the hippocampus neuron. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2017; 50:151-158. [PMID: 28189061 DOI: 10.1016/j.etap.2017.02.006] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2016] [Revised: 01/31/2017] [Accepted: 02/03/2017] [Indexed: 06/06/2023]
Abstract
This study is to investigate the neurotoxicity of PBDE-209 during pregnancy through autophagy and apoptosis in the fetal hippocampus neuron. The autophagy protein levels of LC3-II and Beclin-1 were significantly higher in hippocampus tissue and neuron, while P62 protein were lower. Apoptosis protein Cleaved Caspase-3 and Cleaved PARP was significantly higher in PBDE dose groups and BCL-2 levels in high PBDE dose groups were significantly lower. During the Morris water maze task, the escape latency times of high PBDE dose groups were significantly longer. PBDE-209-induced autophagy leads to neurons death and inhibition of autophagy reduce PBDE-209-induced apoptotic cell death. These results suggest that exposure of the PBDE-209 during pregnancy increases hippocampal autophagy, decrease neuron viability, and it partly effect apoptosis induced by PBDE-209. All that may contribute to the decline of learning and memory ability in the offspring.
Collapse
Affiliation(s)
- Wen Sun
- Department of Obstetrics and Gynecology, Third Affiliated Hospital of Guangzhou Medical University, Key Laboratory for Major Obstetric Diseases of Guangdong Province, Guangzhou 510150, China
| | - Lili Du
- Department of Obstetrics and Gynecology, Third Affiliated Hospital of Guangzhou Medical University, Key Laboratory for Major Obstetric Diseases of Guangdong Province, Guangzhou 510150, China
| | - Wenting Tang
- Department of Obstetrics and Gynecology, Third Affiliated Hospital of Guangzhou Medical University, Key Laboratory for Major Obstetric Diseases of Guangdong Province, Guangzhou 510150, China
| | - Liyun Kuang
- Department of Obstetrics and Gynecology, Third Affiliated Hospital of Guangzhou Medical University, Key Laboratory for Major Obstetric Diseases of Guangdong Province, Guangzhou 510150, China
| | - Peili Du
- Department of Obstetrics and Gynecology, Third Affiliated Hospital of Guangzhou Medical University, Key Laboratory for Major Obstetric Diseases of Guangdong Province, Guangzhou 510150, China
| | - Jingsi Chen
- Department of Obstetrics and Gynecology, Third Affiliated Hospital of Guangzhou Medical University, Key Laboratory for Major Obstetric Diseases of Guangdong Province, Guangzhou 510150, China
| | - Dunjin Chen
- Department of Obstetrics and Gynecology, Third Affiliated Hospital of Guangzhou Medical University, Key Laboratory for Major Obstetric Diseases of Guangdong Province, Guangzhou 510150, China.
| |
Collapse
|
26
|
Zhao Y, Li Y, Qin X, Lou Q, Qin Z. Accumulation of polybrominated diphenyl ethers in the brain compared with the levels in other tissues among different vertebrates from an e-waste recycling site. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2016; 218:1334-1341. [PMID: 27613322 DOI: 10.1016/j.envpol.2016.08.091] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2016] [Revised: 08/31/2016] [Accepted: 08/31/2016] [Indexed: 06/06/2023]
Abstract
This study aimed to investigate the accumulation of polybrominated diphenyl ethers (PBDEs) in the brain compared with that in other tissues among different vertebrates. We collected mice, chickens, ducks, frogs, and fish from an e-waste recycling region in Taizhou, China, and measured PBDE concentrations in brain, liver and muscle tissues. The levels of PBDE in the tissues of mice, chickens, ducks, frogs and fish ranged 0.45-206, 0.06-18.8, 1.83-112, 2.75-108, and 0.02-32.0 ng/g wet weight, respectively. Preferential distribution in the liver and muscle relative to the brain was observed for PBDEs in mice, chickens, ducks and frogs. However, a high retention in the brain compared to the liver and muscle was observed in fish. Comparison of the brain/liver concentration (B/L) ratios revealed differences in PBDEs accumulation in the brain among these vertebrates. PBDEs accumulation in the brain was greatest in fish, followed by frogs, while the lowest accumulation occurred in the brains of mammals and birds. The findings apparently coincided with the evolution of the blood-brain barrier (BBB) across vertebrates, i.e. the BBB of fish might be less efficient than those of mammals, birds and amphibian. Low brominated congeners (such as BDE-28, BDE-47 and BDE-99) were predominant in the brains of investigated vertebrates, whereas BDE-209 was most abundant in liver and muscle tissues of mice, chickens and ducks. Significant differences in B/L ratios among PBDE congeners were found in both mice and chickens (p < 0.05). Particularly in mice, the B/L ratios of PBDE congeners presented a declining trend with increased bromine number. Our findings suggested that low brominated congeners might have a higher capacity to penetrate the BBB and accumulate in the brain, whereas high brominated congeners such as BDE-209 might have less potency to pass through the barrier. Further experimental studies are needed to confirm our findings.
Collapse
Affiliation(s)
- Yaxian Zhao
- Institute for Environmental Reference Materials of Ministry of Environmental Protection, Beijing 100029, China; State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Yuanyuan 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 Science, Beijing 100049, China
| | - Xiaofei Qin
- University of Chinese Academy of Science, Beijing 100049, China
| | - Qinqin Lou
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Zhanfen Qin
- 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 Science, Beijing 100049, China.
| |
Collapse
|
27
|
Pereira LC, de Souza AO, Meireles G, Franco-Bernardes MF, Tasso MJ, Bruno V, Dorta DJ, de Oliveira DP. Comparative Study of Genotoxicity Induced by Six Different PBDEs. Basic Clin Pharmacol Toxicol 2016; 119:396-404. [DOI: 10.1111/bcpt.12595] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2015] [Accepted: 03/30/2015] [Indexed: 12/26/2022]
Affiliation(s)
- Lílian Cristina Pereira
- Department of Clinical; Toxicological and Bromatological Analysis; Faculty of Pharmaceutical Sciences of Ribeirão Preto; University of São Paulo; Ribeirão Preto Brazil
| | - Alecsandra Oliveira de Souza
- Department of Chemistry; Faculty of Philosophy; Sciences and Languages of Ribeirão Preto; University of São Paulo; Paulo Brazil
| | - Gabriela Meireles
- Department of Clinical; Toxicological and Bromatological Analysis; Faculty of Pharmaceutical Sciences of Ribeirão Preto; University of São Paulo; Ribeirão Preto Brazil
| | - Mariana Furio Franco-Bernardes
- Department of Clinical; Toxicological and Bromatological Analysis; Faculty of Pharmaceutical Sciences of Ribeirão Preto; University of São Paulo; Ribeirão Preto Brazil
| | - Maria Júlia Tasso
- Department of Chemistry; Faculty of Philosophy; Sciences and Languages of Ribeirão Preto; University of São Paulo; Paulo Brazil
| | - Vítor Bruno
- Department of Chemistry; Faculty of Philosophy; Sciences and Languages of Ribeirão Preto; University of São Paulo; Paulo Brazil
| | - Daniel Junqueira Dorta
- Department of Chemistry; Faculty of Philosophy; Sciences and Languages of Ribeirão Preto; University of São Paulo; Paulo Brazil
| | - Danielle Palma de Oliveira
- Department of Clinical; Toxicological and Bromatological Analysis; Faculty of Pharmaceutical Sciences of Ribeirão Preto; University of São Paulo; Ribeirão Preto Brazil
| |
Collapse
|
28
|
Chevrier C, Warembourg C, Le Maner-Idrissi G, Lacroix A, Dardier V, Le Sourn-Bissaoui S, Rouget F, Monfort C, Gaudreau E, Mercier F, Bonvallot N, Glorennec P, Muckle G, Le Bot B, Cordier S. Childhood exposure to polybrominated diphenyl ethers and neurodevelopment at six years of age. Neurotoxicology 2016; 54:81-88. [PMID: 26955917 DOI: 10.1016/j.neuro.2016.03.002] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2015] [Revised: 03/01/2016] [Accepted: 03/03/2016] [Indexed: 11/30/2022]
Abstract
Mixtures of polybrominated diphenyl ethers (PBDEs) are present in indoor environments. Studies of the developmental effects of exposure to these chemicals in large prospective mother-child cohorts are required, with data on prenatal exposure and long-term follow-up of the children. We aimed to investigate the relationship between prenatal and childhood exposure to PBDEs and neurodevelopment at the age of six years. We determined the levels of PBDEs and other neurotoxicants in cord blood and dust collected from the homes of children for 246 families included in the PELAGIE mother-child cohort in France. We assessed two cognitive domains of the six-year-old children using the Wechsler Intelligence Scale for Children-IV. Verbal comprehension scores were lower in children from homes with higher concentrations of BDE99 (βDetects<median_vs_NonDetects=-1.6; 95% CI: -6.1, 2.9; βDetects≥median_vs_NonDetects=-5.4; -9.9, -1.0; p trend=0.02) and of BDE209 (β2nd_vs_1st_tertile=-1.8; 95% CI: -6.1, 2.5; β3rd_vs_1st_tertile=-3.2; -7.5, 1.2; p trend=0.15) in dust, particularly for boys (p trend=0.02 and 0.04, respectively). Working memory scores seemed to be lower in children with higher BDE99 concentrations in dust (p trend=0.10). No association was observed with cord blood levels of BDE209. Our findings are in agreement with those of four previous studies suggesting adverse cognitive outcomes among children associated with early-life exposure to penta-BDE mixtures, and provide new evidence for the potential neurotoxicity of BDE209. Several countries are in the process of banning the use of PBDE mixtures as flame-retardants. However, these compounds are likely to remain present in the environment for a long time to come.
Collapse
Affiliation(s)
- Cécile Chevrier
- U1085 Irset Research Institute of Health Environment and Work, Inserm, Rennes, France; University of Rennes 1, Rennes, France.
| | - Charline Warembourg
- U1085 Irset Research Institute of Health Environment and Work, Inserm, Rennes, France; University of Rennes 1, Rennes, France
| | - Gaïd Le Maner-Idrissi
- Research Centre for Psychology, Cognition and Communication, University of Rennes 2, Rennes, France
| | - Agnès Lacroix
- Research Centre for Psychology, Cognition and Communication, University of Rennes 2, Rennes, France
| | - Virginie Dardier
- Research Centre for Psychology, Cognition and Communication, University of Rennes 2, Rennes, France
| | | | - Florence Rouget
- U1085 Irset Research Institute of Health Environment and Work, Inserm, Rennes, France; Réseau « Bien Naître en Ille et Vilaine », Rennes, France
| | - Christine Monfort
- U1085 Irset Research Institute of Health Environment and Work, Inserm, Rennes, France; University of Rennes 1, Rennes, France
| | - Eric Gaudreau
- Laboratoire du Centre de Toxicologie (CTQ), Institut national de santé publique du Québec (INSPQ), Québec, Canada
| | - Fabien Mercier
- U1085 Irset Research Institute of Health Environment and Work, Inserm, Rennes, France; EHESP School of Public Health, Sorbonne, Paris Cité, Rennes, France
| | - Nathalie Bonvallot
- U1085 Irset Research Institute of Health Environment and Work, Inserm, Rennes, France; EHESP School of Public Health, Sorbonne, Paris Cité, Rennes, France
| | - Philippe Glorennec
- U1085 Irset Research Institute of Health Environment and Work, Inserm, Rennes, France; EHESP School of Public Health, Sorbonne, Paris Cité, Rennes, France
| | - Gina Muckle
- École de psychologie, Université Laval, Centre de recherche du Centre Hospitalier Universitaire de Québec, Québec, Canada
| | - Barbara Le Bot
- U1085 Irset Research Institute of Health Environment and Work, Inserm, Rennes, France; EHESP School of Public Health, Sorbonne, Paris Cité, Rennes, France
| | - Sylvaine Cordier
- U1085 Irset Research Institute of Health Environment and Work, Inserm, Rennes, France; University of Rennes 1, Rennes, France
| |
Collapse
|
29
|
Krieger LK, Szeitz A, Bandiera SM. Evaluation of hepatic biotransformation of polybrominated diphenyl ethers in the polar bear (Ursus maritimus). CHEMOSPHERE 2016; 146:555-564. [PMID: 26745384 DOI: 10.1016/j.chemosphere.2015.11.120] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Revised: 11/27/2015] [Accepted: 11/29/2015] [Indexed: 06/05/2023]
Abstract
Polar bears are at the top of the Arctic marine food chain and are subject to exposure and bioaccumulation of environmental chemicals of concern such as polybrominated diphenyl ethers (PBDEs), which were widely used as flame retardants. The aim of the present study was to evaluate the in vitro oxidative metabolism of 2,2',4,4'-tetrabrominated diphenyl ether (BDE-47) and 2,2',4,4',5-pentabrominated diphenyl ether (BDE-99) by polar bear liver microsomes. The identification and quantification of the hydroxy-brominated diphenyl ethers formed were assessed using an ultra-high performance liquid chromatography-tandem mass spectrometry-based method. Incubation of BDE-47 with archived individual liver microsomes, prepared from fifteen polar bears from northern Canada, produced a total of eleven hydroxylated metabolites, eight of which were identified using authentic standards. The major metabolites were 4'-hydroxy-2,2',4,5'-tetrabromodiphenyl ether and 5'-hydroxy-2,2',4,4'-tetrabromodiphenyl ether. Incubation of BDE-99 with polar bear liver microsomes produced a total of eleven hydroxylated metabolites, seven of which were identified using authentic standards. The major metabolites were 2,4,5-tribromophenol and 4-hydroxy-2,2',3,4',5-pentabromodiphenyl ether. Among the CYP specific antibodies tested, anti-rat CYP2B was found to be the most active in inhibiting the formation of hydroxylated metabolites of both BDE-47 and BDE-99, indicating that CYP2B was the major CYP enzyme involved in the oxidative biotransformation of these two congeners. Our study shows that polar bears are capable of forming multiple hydroxylated metabolites of BDE-47 and BDE-99 in vitro and demonstrates the role of CYP2B in the biotransformation and possibly in the toxicity of BDE-47 and BDE-99 in polar bears.
Collapse
Affiliation(s)
- Lisa K Krieger
- Faculty of Pharmaceutical Sciences, The University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada
| | - András Szeitz
- Faculty of Pharmaceutical Sciences, The University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada
| | - Stelvio M Bandiera
- Faculty of Pharmaceutical Sciences, The University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada.
| |
Collapse
|
30
|
Gill S, Hou Y, Li N, Pulido O, Bowers W. Developmental neurotoxicity of polybrominated diphenyl ethers mixture de71 in Sprague-Dawley rats. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2016; 79:482-93. [PMID: 27294297 DOI: 10.1080/15287394.2016.1182001] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Polybrominated diphenyl ethers (PBDE) are a class of brominated flame retardants that are recognized as global environmental contaminants and a potential adverse health risk. The objective of this study was to evaluate the developmental impacts on rat Sprague-Dawley (SD) pups at postnatal day (PND) 11, 21, 50, 105, and 250 after perinatal exposure to a DE71 mixture. These PNDs corresponded to juveniles, young, and mature adults, respectively. The analysis included histopathological, transcriptional evaluation, and Western blots in both hippocampus and midbrain. There were no marked histopathological changes, but significant transcriptional alterations were observed at PND 21 and 250 in midbrain. These changes occurred in a number of the markers of the cholinergic system, including acetylcholinesterase, muscarinic and nicotinic receptors, and structural gene,s including those of neurofilaments, cell adhesion molecules including N-cadherin and CAMKII, and cytokines. The markers were upregulated at least twofold or greater at PND 21. These biomarkers were predominantly altered in males at low dose (0.3 mg/kg), whereas females were affected only at high concentration (30 mg/kg). At PND 250 both males and females showed downregulation of markers in both intermediate- and high-dose groups. Our results support the findings that in utero and lactational exposure to DE71 mixture leads to transcriptional alterations in midbrain of adult SD rats.
Collapse
Affiliation(s)
- Santokh Gill
- a Regulatory Toxicology Research Division , Health Products and Foods Branch, Health Canada , Ottawa , Ontario , Canada
| | - Yangxun Hou
- a Regulatory Toxicology Research Division , Health Products and Foods Branch, Health Canada , Ottawa , Ontario , Canada
| | - Nanqin Li
- b Hazard Identification Division , Environmental Health Science and Research Bureau, Health Canada , Ottawa , Ontario , Canada
| | - Olga Pulido
- c Departmental of Pathology and Laboratory Medicine , University of Ottawa , Ottawa , Ontario , Canada
| | - Wayne Bowers
- b Hazard Identification Division , Environmental Health Science and Research Bureau, Health Canada , Ottawa , Ontario , Canada
- d Department of Neuroscience , Carleton University , Ottawa , Ontario , Canada
| |
Collapse
|
31
|
Xu B, Yang H, Sun M, Chen H, Jiang L, Zheng X, Ding G, Liu Y, Sheng Y, Cui D, Duan Y. 2,3',4,4',5-Pentachlorobiphenyl Induces Inflammatory Responses in the Thyroid Through JNK and Aryl Hydrocarbon Receptor-Mediated Pathway. Toxicol Sci 2015; 149:300-11. [PMID: 26519956 DOI: 10.1093/toxsci/kfv235] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Polychlorinated biphenyls (PCBs) are durable and widely distributed environmental contaminants that can compromise the normal functions of multiple organs and systems; one important mechanism is the induction of inflammatory disorders. In this study, we explored the influences of 2,3',4,4',5-pentachlorobiphenyl (PCB118) on inflammatory responses and its underlying mechanisms in the thyroid. Wistar rats were administered PCB118 intraperitoneally at 0, 10, 100, and 1000 μg/kg/d, 5 days a week for 13 weeks; rat thyroid FRTL-5 cells were treated with PCB118 (0, 0.25, 2.5, and 25 nM) for indicated time. Results revealed that PCB118 promoted the generation of interleukin-6 (IL-6), tumor necrosis factor-α (TNF-α), and intercellular adhesion molecule-1 (ICAM-1) in a time- and dose-related manner and decreased sodium/iodide symporter (NIS) protein expression. Moreover, stimulation with PCB118 resulted in the upregulation of the aryl hydrocarbon receptor (AhR)-responsive gene cytochrome P450 1A1 in FRTL-5 cells; whereas pretreatment with the AhR inhibitor α-naphthoflavone or AhR small interfering RNA (siRNA) suppressed AhR, CYP1A1, IL-6, and ICAM-1 and restored NIS expression. In vivo and in vitro studies also suggested that the c-Jun N-terminal kinase (JNK) pathway was activated on PCB118 exposure, and the experiments using siRNA for JNK partially blocked PCB118-induced upregulation of IL-6 and ICAM-1 and downregulation of NIS. Altogether, PCB118 stimulates production of IL-6, TNF-α, and ICAM-1 in the thyroid through AhR and JNK activations and subsequently interferes with NIS expression, resulting in the disruption of thyroid structure and function.
Collapse
Affiliation(s)
- Bojin Xu
- *Department of Endocrinology and
| | - Hui Yang
- *Department of Endocrinology and
| | | | | | | | | | | | - Yun Liu
- Department of Gerontology, First Affiliated Hospital of Nanjing Medical University, Nanjing 210029, China
| | - Yunlu Sheng
- Department of Gerontology, First Affiliated Hospital of Nanjing Medical University, Nanjing 210029, China
| | - Dai Cui
- *Department of Endocrinology and
| | - Yu Duan
- *Department of Endocrinology and
| |
Collapse
|