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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.
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Nguyen HD. Exposure to mixed chemicals elevated triiodothyronine (T3) and follicle-stimulating hormone (FSH) levels: epidemiology and in silico toxicogenomic involvement. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:88803-88823. [PMID: 37442928 DOI: 10.1007/s11356-023-28704-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2023] [Accepted: 07/05/2023] [Indexed: 07/15/2023]
Abstract
There is a dearth of evidence on the effects of a mixture of numerous different types of chemicals on hormone functions. We hypothesized that exposure to mixed chemicals may alter hormone levels. Thus, this study was to identify an association between the mixed chemicals (25 chemicals) and hormone levels (thyroxine (T4) and triiodothyronine (T3), thyroid-stimulating hormone (TSH), and follicle-stimulating hormone (FSH)) among 5687 Korean adults using four different statistical approaches. Furthermore, we elucidate the effects of the key chemicals on thyroid disease and infertility based on the findings from epidemiology data. The positive associations between mixed chemicals and T3 and between mixed chemicals and FSH were observed across different methods after adjusting for all possible confounders. In the weighted quantile sum regression models, there were positive associations between mixed chemicals and T3 (β = 4.43, 95%CI: 2.81-5.88) and ln-transformed FSH (lnFSH) (β = 0.15, 95%CI: 0.10-0.20). In the quantile g-computation models, positive associations were found between mixed chemicals and T3 (β=2.15, 95%CI: 0.17-4.14) and lnFSH (β=0.15, 95%CI: 0.07-0.22). In the Bayesian kernel machine regression models, culminative effects of mixed chemicals showed positive associations with T3 and lnFSH; mercury (group posterior inclusion probabilities (PIPs) = 0.557 and conditional PPI = 0.556) and lead (group PIP group = 0.815 and conditional PPI = 0.951) were the most important chemicals for T3 and FSH, respectively. The results obtained were partially robust when subjected to in silico toxicogenomic data. We identified several molecular mechanisms that were implicated in Hg-induced thyroid disease, including the selenium micronutrient network, oxidative stress response, IL-17 signaling pathway, poorly differentiated thyroid carcinoma, and primary hyperthyroidism. The molecular processes implicated in Pb-induced infertility were "response to nutrient levels," "gonad development," "male infertility," "female infertility," and "intrinsic pathway for apoptosis," with a particular focus on FSH. The present study investigated the threshold levels of the studied chemicals and their potential impact on the disruption of T3 and FSH hormones. Future research is warranted to determine the effects of mixed chemicals on various hormones because there have been few studies on the disruption of hormones caused by such mixed chemicals.
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Affiliation(s)
- Hai Duc Nguyen
- Department of Pharmacy, College of Pharmacy and Research Institute of Life and Pharmaceutical Sciences, Sunchon National University, Sunchon, 57922, Jeonnam, Republic of Korea.
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Branco JM, Hingst-Zaher E, Dillon D, Jordan-Ward R, Siegrist J, Fischer JD, Schiesari L, von Hippel FA, Buck CL. A novel method for extraction and quantification of feather triiodothyronine (T3) and application to ecotoxicology of Purple Martin (Progne subis). ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023; 332:121943. [PMID: 37301461 DOI: 10.1016/j.envpol.2023.121943] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Revised: 05/29/2023] [Accepted: 05/30/2023] [Indexed: 06/12/2023]
Abstract
Seventy-three percent of aerial insectivore species of birds breeding in North America have declined in the past five years. This decline is even greater in migratory insectivorous species, which face stressors in both their breeding and non-breeding ranges. The Purple Martin (Progne subis) is an aerial insectivore swallow that overwinters in South America and migrates to North America to breed. Purple Martin populations have declined by an estimated 25% since 1966. The eastern subspecies (P. subis subis) has declined the most and overwinters in the Amazon Basin, a region rich in environmental mercury (Hg) contamination. Previous studies reported elevated levels of Hg in feathers of this subspecies, which correlated negatively with body mass and fat reserves. Given the propensity of Hg to disrupt the endocrine system, and the role of thyroid hormones in regulating fat metabolism, this study quantifies concentrations of Hg and the thyroid hormone triiodothyronine (T3) in the feathers of P. subis subis. To our knowledge, this is the first study to extract and quantify T3 in feathers; thus, we developed, tested, and optimized a method for extracting T3 from feather tissue and validated an enzyme immunoassay (EIA) to quantify T3 in Purple Martin feathers. The developed method yielded acceptable results for both parallelism and accuracy. The observed T3 concentrations were statistically modeled along with total Hg (THg) concentrations, but these variables were not significantly correlated. This suggests that the observed variation in THg concentration may be insufficient to cause a discernible change in T3 concentration. Furthermore, the observed effect of breeding location on feather T3 concentration might have obscured any effect of Hg.
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Affiliation(s)
- Jonathan M Branco
- Departmento de Ecologia, Universidade de São Paulo - Rua Do Matão, 321 - Trav. 14, São Paulo, SP, CEP 05508090, Brazil.
| | - Erika Hingst-Zaher
- Museu Biologico, Instituto Butantan - Av Vital Brasil 1500, São Paulo, SP, CEP 05503-900, Brazil
| | - Danielle Dillon
- Department of Biological Sciences, Northern Arizona University - 617 S Beaver, Flagstaff, AZ, 86011, USA
| | - Renee Jordan-Ward
- Department of Biological Sciences, Northern Arizona University - 617 S Beaver, Flagstaff, AZ, 86011, USA
| | - Joe Siegrist
- Purple Martin Conservation Association - 301 Peninsula Drive, Suite 6 Erie, PA, 16505, USA
| | - Jason D Fischer
- Disney's Animals, Science and Environment, Lake Buena Vista, FL, 32830, USA
| | - Luis Schiesari
- Escola de Artes, Ciências e Humanidades, Universidade de São Paulo, Rua Arlindo Bettio, 1000, São Paulo, SP, CEP 03828-000, Brazil
| | - Frank A von Hippel
- Department of Community, Environment and Policy, University of Arizona - 1295 N. Martin Avenue, Tucson, AZ, 85724, USA
| | - C Loren Buck
- Department of Biological Sciences, Northern Arizona University - 617 S Beaver, Flagstaff, AZ, 86011, USA
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Dufour P, Pirard C, Lebrethon MC, Charlier C. Associations between endocrine disruptor contamination and thyroid hormone homeostasis in Belgian type 1 diabetic children. Int Arch Occup Environ Health 2023:10.1007/s00420-023-01974-9. [PMID: 37071173 DOI: 10.1007/s00420-023-01974-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Accepted: 04/05/2023] [Indexed: 04/19/2023]
Abstract
PURPOSE Humans are daily exposed to many environmental pollutants, some of which being suspected to be thyroid disruptors. Some populations could be particularly susceptible to thyroid disruption, such like diabetics due to the well-known relation between the thyroid function and the control of carbohydrate homeostasis by pancreas. Therefore, the aim of this study was to investigate the associations between the exposure to several persistent and non-persistent chemicals and thyroid hormones levels in children with type 1 diabetes. METHODS Blood and urine sample were collected from 54 children diagnosed for type 1 diabetes mellitus. The concentrations of 7 phthalate metabolites, 4 parabens, 7 bisphenols, benzophenone 3 and triclosan were measured in urine, while 15 organochlorine pesticides, 4 polychlorinated biphenyls (PCBs) and 7 perfluoroalkyl substances were analyzed in serum samples. In the same time, the blood levels of free thyroxine (fT4), thyroid stimulating hormone (TSH) and glycated hemoglobin (Hb1Ac) were determined. RESULTS We highlighted positive associations between serum perfluorohexane sulfonate and urinary monoethylphthalate levels, and TSH level in blood. We also found that PCB 138 was positively associated to fT4 while urinary levels of bisphenol F were negatively correlated to this hormone. Finally, we observed positive associations between Hb1Ac levels and the contamination by PCB 153 and two urinary phthalate metabolites: mono-2-ethyl-5-hydroxyhexyl phthalate and mono-2-ethyl-5-oxoxyhexyl phthalate. CONCLUSION Our results showed that our small cohort of children with type 1 diabetes mellitus is potentially susceptible to thyroid disruptions by some pollutants. Moreover, for these children, both di-(2-ethylhexyl) phthalate metabolites would potentially hamper the glucose homeostasis. Nevertheless, additional studies are mandatory to further explore these findings.
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Affiliation(s)
- Patrice Dufour
- Laboratory of Clinical, Forensic and Environmental Toxicology, University of Liege (ULiège), CHU (B35), 1, Avenue de L'Hôpital, 4000, Liege, Belgium.
- Center for Interdisciplinary Research On Medicines (C.I.R.M.), University of Liege (ULiège), CHU (B35), 4000, Liege, Belgium.
| | - Catherine Pirard
- Laboratory of Clinical, Forensic and Environmental Toxicology, University of Liege (ULiège), CHU (B35), 1, Avenue de L'Hôpital, 4000, Liege, Belgium
- Center for Interdisciplinary Research On Medicines (C.I.R.M.), University of Liege (ULiège), CHU (B35), 4000, Liege, Belgium
| | | | - Corinne Charlier
- Laboratory of Clinical, Forensic and Environmental Toxicology, University of Liege (ULiège), CHU (B35), 1, Avenue de L'Hôpital, 4000, Liege, Belgium
- Center for Interdisciplinary Research On Medicines (C.I.R.M.), University of Liege (ULiège), CHU (B35), 4000, Liege, Belgium
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McMullin JL, Codner J, Patel SG, Sharma J, Hu X, Jones DP, Weber CJ, Saunders ND. Environmental Chemicals and their Association with Hyperparathyroidism. World J Surg 2023; 47:296-303. [PMID: 36161354 DOI: 10.1007/s00268-022-06759-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/10/2022] [Indexed: 01/04/2023]
Abstract
BACKGROUND The incidence of hyperparathyroidism has increased in the USA. The previous work from our institution detected environmental chemicals (EC) within hyperplastic parathyroid tumors. The National Health and Nutrition Examination Survey (NHANES) is a program designed to assess the health status of people in the USA and includes measurements of EC in serum. Our aim was to determine which EC are associated with elevated parathyroid hormone (PTH) and calcium levels within NHANES. METHODS NHANES was queried from 2003-2016 for our analysis with calcium. A separate subgroup was queried from 2003-2006 that included PTH levels. Subjects with elevated calcium, and elevated PTH and normal Vitamin D levels were identified. Wilcoxon rank sum tests were used to analyze levels of EC in those with elevated calcium, and those with elevated PTH in the subgroup. All EC with p < 0.05 were then included in separate multivariate models adjusting for serum vitamin D and creatinine for PTH and albumin for calcium. RESULTS There were 51,395 subjects analyzed, and calcium was elevated in 2.1% (1080) of subjects. Our subgroup analysis analyzed 14,681 subjects, and PTH was elevated without deficient Vitamin D in 9.4% (1,377). Twenty-nine different polychlorinated biphenyls and the organochlorine pesticides hexachlorobenzene, transnonachlor, oxychlordane, and p,p'-dichlorodiphenyldichloroethylene (DDE) were found to be associated with elevated calcium and separately with elevated PTH (all p < 0.05). CONCLUSION In NHANES, 33 ECs were found to be associated with elevated calcium as well as elevated PTH levels on our subgroup analysis. These chemicals may lead us toward a causal link between environmental factors and the development of hyperparathyroidism and should be the focus of future studies looking at chemical levels within specimens.
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Affiliation(s)
- Jessica Liu McMullin
- Department of Surgery, Emory University, 1365 Clifton Road, Clinic A 4th Floor, 30322, Atlanta, Gabon. .,, 1808 7th Ave South, BDB D509R, 35233, Birmingham, Albania.
| | - Jesse Codner
- Department of Surgery, Emory University, 1365 Clifton Road, Clinic A 4th Floor, 30322, Atlanta, Gabon
| | - Snehal G Patel
- Department of Surgery, Emory University, 1365 Clifton Road, Clinic A 4th Floor, 30322, Atlanta, Gabon
| | - Jyotirmay Sharma
- Department of Surgery, Emory University, 1365 Clifton Road, Clinic A 4th Floor, 30322, Atlanta, Gabon
| | - Xin Hu
- Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Emory University, Atlanta, Gabon
| | - Dean P Jones
- Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Emory University, Atlanta, Gabon
| | - Collin J Weber
- Department of Surgery, Emory University, 1365 Clifton Road, Clinic A 4th Floor, 30322, Atlanta, Gabon
| | - Neil D Saunders
- Department of Surgery, Emory University, 1365 Clifton Road, Clinic A 4th Floor, 30322, Atlanta, Gabon.
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Wang G, Liu Y, Wang X, Dong X, Jiang N, Wang H. Application of dual carbon-bromine stable isotope analysis to characterize anaerobic micro-degradation mechanisms of PBDEs in wetland bottom-water. WATER RESEARCH 2022; 208:117854. [PMID: 34800854 DOI: 10.1016/j.watres.2021.117854] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2021] [Revised: 11/05/2021] [Accepted: 11/06/2021] [Indexed: 06/13/2023]
Abstract
Polybrominated diphenyl ethers (PBDEs), one kind of persistent organic pollutants, were widely detected in coastal wetlands. Microbial reductive debromination is one of the most important attenuation processes for PBDEs in anaerobic environment, whereas the underlying reaction mechanisms remain elusive. Dual-element stable isotope analysis was recently recognized to distinguish different reaction mechanism for degradation of organic pollutants. In this study, the dual carbon-bromine isotope effects associated with the anaerobic microbial degradation were first investigated to characterize the reaction mechanisms for BDE-47 and BDE-153. Presence of lower brominated congeners indicated stepwise debromination as the main degradation pathway, with the preferential removal of bromine in para position > meta/ortho position. The pronounced isotope fractionation was observed for both carbon and bromine, with similar carbon (εC) and bromine isotope enrichment factor (εBr) between BDE-47 (εC = -5.98‰, εBr = -2.44‰) and BDE-153 (εC = -5.57‰, εBr = -2.06‰) during the microbial degradation. Compared to εC and εBr, the correlation of carbon and isotope effects (ΛC/Br = Δδ81Br/Δδ13C) was almost the same between BDE-47 (0.436) and BDE-153 (0.435), indicating the similar reaction mechanism. The calculated carbon and bromine apparent kinetic isotope effects (AKIEC and AKIEBr) were 1.0773 and 1.0098 for BDE-47 and 1.0716 and 1.0125 for BDE-153, within range reported for degradation of halogenated compounds following nucleophilic substitution. Combination analysis of degradation products, ΛC/Br and AKIE, all the results pointed to that the anaerobic reductive debromination of BDE-47 and BDE-153 followed the nucleophilic aromatic substitution, with the addition of cofactor to the benzene ring concomitant with dissociation of carbon-bromine bond via the inner-sphere electron transfer, and the cleavage of C-Br bond was the rate-determining step. This study contributed to the development of dual carbon-bromine isotope analysis as a robust approach to probe the fate of PBDEs in contaminated sites.
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Affiliation(s)
- Guoguang Wang
- College of Environmental Science and Engineering, Dalian Maritime University, Dalian 116026, China
| | - Yu Liu
- College of Environmental Science and Engineering, Dalian Maritime University, Dalian 116026, China; Environmental Information Institute, Dalian Maritime University, Dalian 116026, China.
| | - Xu Wang
- College of Environmental Science and Engineering, Dalian Maritime University, Dalian 116026, China
| | - Xu Dong
- College of Environmental Science and Engineering, Dalian Maritime University, Dalian 116026, China
| | - Na Jiang
- College of Environmental Science and Engineering, Dalian Maritime University, Dalian 116026, China
| | - Haixia Wang
- Navigation College, Dalian Maritime University, Dalian 116026, China
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Leijs M, Fietkau K, Merk HF, Schettgen T, Kraus T, Esser A. Upregulation of CCL7, CCL20, CXCL2, IL-1β, IL-6 and MMP-9 in Skin Samples of PCB Exposed Individuals-A Preliminary Study. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 18:ijerph18189711. [PMID: 34574641 PMCID: PMC8468641 DOI: 10.3390/ijerph18189711] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 08/03/2021] [Accepted: 08/30/2021] [Indexed: 11/16/2022]
Abstract
Polychlorinated biphenyls (PCBs) are well known immunotoxic and carcinogenic compounds. Although cutaneous symptoms are the hallmark of exposure to these compounds, exact pathophysiologic mechanisms are not well understood. We took skin biopsies from moderately high PCB exposed workers (n = 25) after an informed consent and investigated the expression of immunological markers such as CCL-7, CCL-20, CXCL2, IL-1β and IL-6, as well as the matrix metalloproteinase MMP-9, EPGN and NRF2 by RT-qPCR, and compared expression levels with plasma PCB levels. Statistical analyses showed a significant correlation between CCL-20, CXCL2, IL-6, IL-1β, CCL-7 and MMP-9 and PCB serum levels. EPGN and NRF2 were not correlated to PCB levels in the blood. We found a significant correlation of genes involved in autoimmune, auto-inflammatory and carcinogenesis in skin samples of PCB exposed individuals with elevated plasma PCB levels. Confirmation of these findings needs to be performed in bigger study groups and larger gen-sets, including multiple housekeeping genes. Further study needs to be performed to see whether a chronical exposure to these and similar compounds can cause higher incidence of malignancies and inflammatory disease.
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Affiliation(s)
- Marike Leijs
- Department of Dermatology and Allergology, Medical Faculty, RWTH Aachen University, 52072 Aachen, Germany; (K.F.); (H.F.M.)
- Department of Dermatology, St. Nikolaus Hospital Eupen, 4700 Eupen, Belgium
- Correspondence:
| | - Katharina Fietkau
- Department of Dermatology and Allergology, Medical Faculty, RWTH Aachen University, 52072 Aachen, Germany; (K.F.); (H.F.M.)
| | - Hans F. Merk
- Department of Dermatology and Allergology, Medical Faculty, RWTH Aachen University, 52072 Aachen, Germany; (K.F.); (H.F.M.)
| | - Thomas Schettgen
- Institute for Occupational, Social and Environmental Medicine, Medical Faculty, RWTH Aachen University, 52072 Aachen, Germany; (T.S.); (T.K.); (A.E.)
| | - Thomas Kraus
- Institute for Occupational, Social and Environmental Medicine, Medical Faculty, RWTH Aachen University, 52072 Aachen, Germany; (T.S.); (T.K.); (A.E.)
| | - André Esser
- Institute for Occupational, Social and Environmental Medicine, Medical Faculty, RWTH Aachen University, 52072 Aachen, Germany; (T.S.); (T.K.); (A.E.)
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Perinatal effects of persistent organic pollutants on thyroid hormone concentration in placenta and breastmilk. Mol Aspects Med 2021; 87:100988. [PMID: 34238594 DOI: 10.1016/j.mam.2021.100988] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Revised: 04/30/2021] [Accepted: 06/08/2021] [Indexed: 12/18/2022]
Abstract
Thyroid hormones (TH) are known to play a critical role in regulating many biological processes including growth and development, energy homeostasis, thermogenesis, lipolysis and metabolism of cholesterol. Severe TH deficiency especially during fetal development results in cretinism, but can also lead to an imbalance in metabolism with, among others, an alteration in body weight composition. Over the past two decades, increasing evidence has shown that certain persistent organic pollutants (POP) can interfere with the endocrine system. These POP referred to as "endocrine disrupting chemicals" are widely present in the environment and populations are exposed globally. Moreover, epidemiological studies have shown that a particularly sensitive period is the pre- and postnatal time. Indeed, perinatal exposure to such chemicals could lead to the onset diseases in later life. It is known, that, maternal thyroid hormones are transported by the placenta to the fetus from 6 weeks of gestation and it seems that during the first trimester, and part of the second, the fetus is entirely dependent on maternal TH supply for its development. Interferences in the TH-network as a consequence of the exposure to such pollutants could cause variations in TH concentration. Only small changes in maternal thyroid hormone levels in early stages of pregnancy can influence fetal neurological and cardiovascular development, as well as according to recent studies, have effect on childhood body composition. With this review, we will report the most recent and important studies concerning the association between thyroid hormone concentration and POP levels measured during the perinatal period. We will mostly focus on the data recently reported on placenta and breastmilk as main sources for understanding the potential consequences of exposure. The possible link between exposure to pollutants, TH dysregulation and possible adverse outcome will also be briefly discussed. From our literature search, several studies support the hypothesis that pre- and postnatal exposure to different pollutants might play a role in causing variation in thyroid hormone concentration. However, few research papers have so far studied the relationship linking exposure to pollutants, TH concentration and possible health consequences. Therefore, this review highlights the need for further research in this direction.
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Zhao X, Yang X, Du Y, Li R, Zhou T, Wang Y, Chen T, Wang D, Shi Z. Polybrominated diphenyl ethers in serum from residents living in a brominated flame retardant production area: Occurrence, influencing factors, and relationships with thyroid and liver function. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 270:116046. [PMID: 33333402 DOI: 10.1016/j.envpol.2020.116046] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Revised: 07/17/2020] [Accepted: 10/06/2020] [Indexed: 06/12/2023]
Abstract
Polybrominated diphenyl ethers (PBDEs) have been used as flame retardants (FRs) in China for decades, even after they were identified as persistent organic pollutants. In this study, serum samples were collected from 172 adults without occupational exposure who were residents of a well-known FR production region (Laizhou Bay, north China), and PBDE congeners were measured to assess their occurrence, congener profile and influencing factors in serum. Moreover, the relationships between serum concentrations of PBDEs and thyroid/liver function indicators were analyzed to evaluate whether human exposure to PBDEs would lead to thyroid/liver injury. All 8 PBDE congeners were detected at higher frequencies and serum concentrations than those found in general populations. The median levels of ∑PBDEs, BDE-209 and ∑3-7PBDEs (sum of tri-to hepta-BDEs) were 64.5, 56.9 and 7.2 ng/g lw (lipid weight), respectively, which indicated that deca-BDE was the primarily produced PBDE in Laizhou Bay and that the lower brominated BDEs were still ubiquitous in the environment. Gender was a primary influencing factor for some BDE congeners in serum; their levels in female serum samples were significantly lower than those in male serum samples. Serum PBDE levels showed a downward trend with increased body mass index (BMI), which might reflect the increasing serum lipid contents. Serum levels of some BDE congeners were significantly positively correlated with certain thyroid hormones and antibodies, including free triiodothyronine (fT3), total triiodothyronine (tT3), total thyroxine (tT4) and thyroid peroxidase antibody (TPO-Ab). Levels of some congeners were significantly negatively correlated with some types of serum lipid, including cholesterol (CHOL), low density lipoprotein (LDL) and total triglyceride (TG). Other than serum lipids, only two liver function indicators, total protein (TP) and direct bilirubin (DBIL), were significantly correlated with certain BDE congeners (BDE-100 and BDE-154). Our results provide new evidence on the thyroid-disrupting and hepatotoxic effects of PBDEs.
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Affiliation(s)
- Xuezhen Zhao
- School of Public Health and Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing, 100069, China
| | - Xiaodi Yang
- School of Public Health and Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing, 100069, China
| | - Yinglin Du
- Shandong Center for Disease Control and Prevention, Jinan, 250014, Shandong, China
| | - Renbo Li
- Shandong Center for Disease Control and Prevention, Jinan, 250014, Shandong, China
| | - Tao Zhou
- Shandong Center for Disease Control and Prevention, Jinan, 250014, Shandong, China
| | - Yuwei Wang
- School of Public Health and Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing, 100069, China
| | - Tian Chen
- School of Public Health and Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing, 100069, China
| | - Dejun Wang
- Shandong Center for Disease Control and Prevention, Jinan, 250014, Shandong, China.
| | - Zhixiong Shi
- School of Public Health and Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing, 100069, China.
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10
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Environmental chemicals and metabolic disruption in primary and secondary human parathyroid tumors. Surgery 2020; 169:102-108. [PMID: 32771296 DOI: 10.1016/j.surg.2020.06.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Revised: 05/08/2020] [Accepted: 06/01/2020] [Indexed: 11/20/2022]
Abstract
BACKGROUND The incidence of primary hyperparathyroidism has increased 300% in the United States in the past 30 years, and secondary hyperparathyroidism is almost universal in patients with end-stage renal disease. We assessed the presence of environmental chemicals in human hyperplastic parathyroid tumors as possible contributing factors to this increase. METHODS Cryopreserved hyperplastic parathyroid tumors and normal human parathyroids were analyzed by gas chromatography and liquid chromatography coupled to ultra-high-resolution mass spectrometry, bioinformatics, and biostatistics. RESULTS Detected environmental chemicals included polychlorinated biphenyls, polybrominated diphenyl ethers, dichloro-diphenyl-trichloroethane derivatives, and other insecticides. A total of 99% had p,p'-dichlorodiphenyldichloroethylene. More than 50% contained other environmental chemicals, and many classified as endocrine disruptors. Polychlorinated biphenyl-28 and polychlorinated biphenyl-49 levels correlated positively with parathyroid tumor mass. Polybrominated diphenyl ether-47 concentrations in tumors were inversely correlated with patients' serum calcium levels. Cellular metabolites in pathways of purine and pyrimidine synthesis and mitochondrial energy production were associated with tumor growth and with p,p'-dichlorodiphenyldichloroethylene in primary hyperparathyroidism tumors. In normal parathyroids, p,p'-dichlorodiphenyldichloroethylene , polychlorinated biphenyl-28, polychlorinated biphenyl-74, and polychlorinated biphenyl-153, but not p,p'-dichlorodiphenyldichloroethylene or polychlorinated biphenyl-49, were detected. CONCLUSION Environmental chemicals are present in human parathyroid tumors and warrant detailed epidemiologic and mechanistic studies to test for causal links to the growth of human parathyroid tumors.
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Dai Q, Xu X, Eskenazi B, Asante KA, Chen A, Fobil J, Bergman Å, Brennan L, Sly PD, Nnorom IC, Pascale A, Wang Q, Zeng EY, Zeng Z, Landrigan PJ, Bruné Drisse MN, Huo X. Severe dioxin-like compound (DLC) contamination in e-waste recycling areas: An under-recognized threat to local health. ENVIRONMENT INTERNATIONAL 2020; 139:105731. [PMID: 32315892 DOI: 10.1016/j.envint.2020.105731] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Revised: 04/07/2020] [Accepted: 04/07/2020] [Indexed: 02/05/2023]
Abstract
Electrical and electronic waste (e-waste) burning and recycling activities have become one of the main emission sources of dioxin-like compounds (DLCs). Workers involved in e-waste recycling operations and residents living near e-waste recycling sites (EWRS) are exposed to high levels of DLCs. Epidemiological and experimental in vivo studies have reported a range of interconnected responses in multiple systems with DLC exposure. However, due to the compositional complexity of DLCs and difficulties in assessing mixture effects of the complex mixture of e-waste-related contaminants, there are few studies concerning human health outcomes related to DLC exposure at informal EWRS. In this paper, we have reviewed the environmental levels and body burdens of DLCs at EWRS and compared them with the levels reported to be associated with observable adverse effects to assess the health risks of DLC exposure at EWRS. In general, DLC concentrations at EWRS of many countries have been decreasing in recent years due to stricter regulations on e-waste recycling activities, but the contamination status is still severe. Comparison with available data from industrial sites and well-known highly DLC contaminated areas shows that high levels of DLCs derived from crude e-waste recycling processes lead to elevated body burdens. The DLC levels in human blood and breast milk at EWRS are higher than those reported in some epidemiological studies that are related to various health impacts. The estimated total daily intakes of DLCs for people in EWRS far exceed the WHO recommended total daily intake limit. It can be inferred that people living in EWRS with high DLC contamination have higher health risks. Therefore, more well-designed epidemiological studies are urgently needed to focus on the health effects of DLC pollution in EWRS. Continuous monitoring of the temporal trends of DLC levels in EWRS after actions is of highest importance.
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Affiliation(s)
- Qingyuan Dai
- Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, China
| | - Xijin Xu
- Laboratory of Environmental Medicine and Developmental Toxicology, Shantou University Medical College, China
| | - Brenda Eskenazi
- School of Public Health, University of California, Berkeley, USA
| | | | - Aimin Chen
- Department of Biostatistics, Epidemiology and Informatics, University of Pennsylvania, USA
| | - Julius Fobil
- School of Public Health, University of Ghana, Ghana
| | - Åke Bergman
- Department of Environmental Science, Stockholm University, Sweden; Department of Science and Technology, Örebro University, Sweden; College of Environmental Science and Engineering, Tongji University, China
| | - Lesley Brennan
- Department of Obstetrics and Gynaecology, University of Alberta, Canada
| | - Peter D Sly
- Child Health Research Centre, University of Queensland, Australia
| | | | - Antonio Pascale
- Department of Toxicology, University of the Republic, Uruguay
| | - Qihua Wang
- Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, China
| | - Eddy Y Zeng
- Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, China
| | - Zhijun Zeng
- Laboratory of Environmental Medicine and Developmental Toxicology, Shantou University Medical College, China
| | | | - Marie-Noel Bruné Drisse
- Department of Environment, Climate Change and Health, World Health Organization, Geneva, Switzerland
| | - Xia Huo
- Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, China.
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12
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Warner M, Rauch S, Ames J, Mocarelli P, Brambilla P, Signorini S, Eskenazi B. Prenatal dioxin exposure and thyroid hormone levels in the Seveso second generation study. ENVIRONMENTAL RESEARCH 2020; 183:109280. [PMID: 32311913 PMCID: PMC7176740 DOI: 10.1016/j.envres.2020.109280] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Revised: 02/14/2020] [Accepted: 02/19/2020] [Indexed: 06/11/2023]
Abstract
BACKGROUND In animal studies, perinatal exposure to 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) alters thyroid homoeostasis and thyroid hormone concentrations; epidemiologic evidence is limited. OBJECTIVES We aimed to determine the association of prenatal exposure to TCDD with thyroid hormone concentrations in the Seveso Second Generation Study, a unique cohort of children born to TCDD-exposed women resulting from a 1976 chemical factory explosion in Seveso, Italy. METHODS We included 570 children (288 female, 282 male) with complete follow-up data, including a fasting blood draw. Serum levels of total and free thyroxine (T4), free triiodothyronine (T3), and thyroid stimulating hormone (TSH) were measured using immunoassays. We defined prenatal TCDD exposure as: 1) maternal initial TCDD concentration measured in serum collected soon after the explosion and 2) maternal TCDD estimated at pregnancy. RESULTS Compared to the lowest quartile (Q1), maternal initial serum TCDD was associated with lower free T3 (Q2: adj-β = -0.13, 95%CI -0.26, 0.00; Q3: adj-β = -0.22, 95%CI -0.35, -0.09; Q4: adj-β = -0.14, 95%CI -0.28, 0.00; p-trend = 0.02). In participants with high thyroid antibody status, inverse associations between maternal initial serum TCDD and free T3 were significantly stronger than in participants with normal antibody status (p-interaction = 0.02). We also observed a positive association between maternal initial serum TCDD and TSH concentrations in participants with high thyroid antibody status (Q2: adj-β = 11.4%, 95%CI -25.2, 66.1; Q3: adj-β = 49.0%, 95%CI 3.0, 115.5; Q4: adj-β = 105.5, 95%CI 36.6, 209.2; p-trend < 0.01) but not in those participants with normal antibody status (p-interaction < 0.01). Similar results were found for TCDD estimated at pregnancy. DISCUSSION Our results suggest prenatal exposure to TCDD, a potent endocrine-disrupting compound, may alter thyroid function later in life. Populations with additional thyroid stress may be particularly susceptible to in utero exposure of thyroid disrupting chemicals.
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Affiliation(s)
- Marcella Warner
- Center for Environmental Research and Children's Health (CERCH), School of Public Health, University of California at Berkeley, Berkeley, CA, USA.
| | - Stephen Rauch
- Center for Environmental Research and Children's Health (CERCH), School of Public Health, University of California at Berkeley, Berkeley, CA, USA
| | - Jennifer Ames
- Center for Environmental Research and Children's Health (CERCH), School of Public Health, University of California at Berkeley, Berkeley, CA, USA
| | - Paolo Mocarelli
- Department of Laboratory Medicine, University of Milano-Bicocca, School of Medicine, Hospital of Desio, Desio, Milano, Italy
| | - Paolo Brambilla
- Department of Laboratory Medicine, University of Milano-Bicocca, School of Medicine, Hospital of Desio, Desio, Milano, Italy
| | - Stefano Signorini
- Department of Laboratory Medicine, University of Milano-Bicocca, School of Medicine, Hospital of Desio, Desio, Milano, Italy
| | - Brenda Eskenazi
- Center for Environmental Research and Children's Health (CERCH), School of Public Health, University of California at Berkeley, Berkeley, CA, USA
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Heiger-Bernays WJ, Tomsho KS, Basra K, Petropoulos ZE, Crawford K, Martinez A, Hornbuckle KC, Scammell MK. Human health risks due to airborne polychlorinated biphenyls are highest in New Bedford Harbor communities living closest to the harbor. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 710:135576. [PMID: 31785914 PMCID: PMC7015809 DOI: 10.1016/j.scitotenv.2019.135576] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Revised: 11/12/2019] [Accepted: 11/15/2019] [Indexed: 04/14/2023]
Abstract
In response to concerns raised by communities surrounding the New Bedford Harbor Superfund site, we completed a field and modeling study that concluded the harbor is the primary source of polychlorinated biphenyls (PCBs) in air around the harbor. The follow-up question from residents was whether the PCBs measured in air pose a risk to their health. The US Environmental Protection Agency focuses their site-specific, risk-based decisions for site clean-up on cancers. We focused our assessment on the non-cancer effects on the thyroid based on the congener specific patterns and concentrations of PCBs measured in air near and distant to the harbor. Human and animal studies of PCB-induced effects on the thyroid provide evidence to support our analysis. Drawing from the published toxicological data, we used a Margin of Exposure (MOE) approach to derive a human-equivalent concentration in air associated with human health effects on the thyroid. Based on the MOEs calculated herein, evaluation of the MOE indicates that changes in thyroid hormone levels are possible among people living adjacent to the Harbor. Changes in thyroid hormone levels are more likely among people who live near the harbor compared to residents living in areas distant from the harbor. This risk assessment documents potential health risks associated with proximity to a marine Superfund Site using site-specific ambient air PCB congener data.
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Affiliation(s)
- Wendy J Heiger-Bernays
- Boston University School of Public Health, Department of Environmental Health, 715 Albany St., Talbot Building, Boston, MA 02118, United States.
| | - Kathryn Scott Tomsho
- Boston University School of Public Health, Department of Environmental Health, 715 Albany St., Talbot Building, Boston, MA 02118, United States
| | - Komal Basra
- Boston University School of Public Health, Department of Environmental Health, 715 Albany St., Talbot Building, Boston, MA 02118, United States
| | - Zoe E Petropoulos
- Boston University School of Public Health, Department of Environmental Health, 715 Albany St., Talbot Building, Boston, MA 02118, United States
| | - Kathryn Crawford
- Boston University School of Public Health, Department of Environmental Health, 715 Albany St., Talbot Building, Boston, MA 02118, United States
| | - Andres Martinez
- Department of Civil & Environmental Engineering, IIHR-Hydroscience and Engineering, 4105 Seamans Center for the Engineering Arts and Sciences, The University of Iowa, Iowa City, IA 52242, United States
| | - Keri C Hornbuckle
- Department of Civil & Environmental Engineering, IIHR-Hydroscience and Engineering, 4105 Seamans Center for the Engineering Arts and Sciences, The University of Iowa, Iowa City, IA 52242, United States
| | - Madeleine K Scammell
- Boston University School of Public Health, Department of Environmental Health, 715 Albany St., Talbot Building, Boston, MA 02118, United States
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14
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Leijs MM, Gan L, De Boever P, Esser A, Amann PM, Ziegler P, Fietkau K, Schettgen T, Kraus T, Merk HF, Baron JM. Altered Gene Expression in Dioxin-Like and Non-Dioxin-Like PCB Exposed Peripheral Blood Mononuclear Cells. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2019; 16:ijerph16122090. [PMID: 31200452 PMCID: PMC6617415 DOI: 10.3390/ijerph16122090] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Revised: 06/07/2019] [Accepted: 06/10/2019] [Indexed: 01/09/2023]
Abstract
Polychlorinated biphenyls (PCBs) are well known carcinogenic persistent environmental pollutants and endocrine disruptors. Our aim was to identify the possible dysregulation of genes in PCB exposed peripheral blood mononuclear cells (PBMCs) in order to give more insight into the differential pathophysiological effects of PCB congeners and mixtures, with an emphasis on immunological effects and oxidative stress. The PBMCs of a healthy volunteer (male, 56 years old) were exposed to a mixture of dioxin-like (DL)-PCBs (PCB 77, 81, 105, 114, 118, 123, 126, 156, 157, 167, 169, and 189, 250 µg/L resp.) or non-dioxin-like (NDL)-PCBs (PCB 28, 52, 101, 138, 153, 180, 250 µg/L resp.) or single PCB congener (no.28, 138, 153, 180, 250 µg/L resp.). After an incubation period of 24 h, a microarray gene expression screening was performed, and the results were compared to gene expression in control samples (PBMCs treated with the vehicle iso-octane). Treatment of PBMCs with the DL-PCB mixture resulted in the largest number of differentially regulated genes (181 upregulated genes >2-fold, 173 downregulated >2-fold). Treatment with the NDL-PCB mix resulted in 32 upregulated genes >2-fold and 12 downregulated genes >2-fold. A gene set enrichment analysis (GSEA) on DL-PCB treated PBMCs resulted in an upregulation of 125 gene sets and a downregulation of 76 gene sets. Predominantly downregulated gene sets were involved in immunological pathways (such as response to virus, innate immune response, defense response). An upregulation of pathways related to oxidative stress could be observed for all PCB congeners except PCB-28; the latter congener dysregulated the least number of genes. Our experiment augments the information known about immunological and cellular stress responses following DL- as well as NDL-PCB exposure and provides new information on PCB 28. Further studies should be performed to evaluate how disruption of these pathways contributes to the development of autoimmune diseases and cancer.
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Affiliation(s)
- Marike M Leijs
- Department of Dermatology and Allergology, RWTH Aachen University, 52074 Aachen, Germany.
| | - Lin Gan
- IZKF, RWTH Aachen University, 52074 Aachen, Germany.
| | - Patrick De Boever
- Flemish Institute for Technological Research (VITO), Health unit, 2400 Mol, Belgium.
- Centre for Environmental Sciences, Hasselt University, 3590 Diepenbeek, Belgium.
| | - André Esser
- Institute for Occupational, Social and Environmental Medicine, RWTH Aachen University, 52074 Aachen, Germany.
| | - Philipp M Amann
- Department of Dermatology and Allergology, RWTH Aachen University, 52074 Aachen, Germany.
- Department of Dermatology, SLK Hospital Heilbronn, 74078 Heilbronn, Germany.
| | - Patrick Ziegler
- Institute for Occupational, Social and Environmental Medicine, RWTH Aachen University, 52074 Aachen, Germany.
| | - Katharina Fietkau
- Department of Dermatology and Allergology, RWTH Aachen University, 52074 Aachen, Germany.
| | - Thomas Schettgen
- Institute for Occupational, Social and Environmental Medicine, RWTH Aachen University, 52074 Aachen, Germany.
| | - Thomas Kraus
- Institute for Occupational, Social and Environmental Medicine, RWTH Aachen University, 52074 Aachen, Germany.
| | - Hans F Merk
- Department of Dermatology and Allergology, RWTH Aachen University, 52074 Aachen, Germany.
| | - Jens M Baron
- Department of Dermatology and Allergology, RWTH Aachen University, 52074 Aachen, Germany.
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15
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Cowell WJ, Sjödin A, Jones R, Wang Y, Wang S, Whyatt RM, Factor-Litvak P, Bradwin G, Hassoun A, Oberfield S, Herbstman JB. Pre- and Postnatal Polybrominated Diphenyl Ether Concentrations in Relation to Thyroid Parameters Measured During Early Childhood. Thyroid 2019; 29:631-641. [PMID: 30907253 PMCID: PMC6533780 DOI: 10.1089/thy.2018.0417] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Background: Penta-brominated diphenyl ethers (PentaBDEs) are endocrine-disrupting chemicals that structurally resemble thyroid hormones and were widely used as flame retardants in household consumer products from 1975 to 2004. Polybrominated diphenyl ethers (PBDEs) cross the placenta, and evidence suggests that for many children, body burdens may peak during the toddler years. This study aimed to understand the impact of exposure timing by examining both pre- and postnatal exposure to BDE-47, the predominant penta-brominated diphenyl ether congener detected in humans, in relation to thyroid hormone parameters measured during early childhood. Methods: The Columbia Center for Children's Environmental Health Mothers and Newborns Study is a prospective birth cohort of African American and Dominican maternal-child pairs. Pregnant women were recruited from two prenatal clinics in Northern Manhattan and the South Bronx between 1998 and 2006. Participants included 158 children with (i) plasma PBDE concentrations measured at birth and in the toddler years (age 2-3 years), and (ii) serum thyroid parameters measured at three and/or five years of age. Outcomes included concentrations of serum thyrotropin, free thyroxine, and total thyroxine. Results: Children with high exposure to BDE-47 during the prenatal period (-17% [confidence interval -29 to -2]) or toddler age (-19% [confidence interval -31 to -5]) had significantly lower geometric mean thyrotropin levels compared to children with low BDE-47 exposure throughout early life. Associations with thyroxine were also inverse; however, they did not reach statistical significance at the p = 0.05 level. Sex-stratified models suggest associations with postnatal exposure may be stronger among boys compared to girls. Conclusions: The thyroid regulatory system may be sensitive to BDE-47 during pre- and postnatal periods.
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Affiliation(s)
- Whitney J. Cowell
- Columbia Center for Children's Environmental Health, Mailman School of Public Health, Columbia University, New York, New York
- Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University, New York, New York
| | - Andreas Sjödin
- Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - Richard Jones
- Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - Ya Wang
- Department of Biostatistics, Mailman School of Public Health, Columbia University, New York, New York
| | - Shuang Wang
- Department of Biostatistics, Mailman School of Public Health, Columbia University, New York, New York
| | - Robin M. Whyatt
- Columbia Center for Children's Environmental Health, Mailman School of Public Health, Columbia University, New York, New York
- Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University, New York, New York
| | - Pam Factor-Litvak
- Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, New York
| | - Gary Bradwin
- Department of Laboratory Medicine, Harvard Medical School and Boston Children's Hospital, Boston, Massachusetts
| | - Abeer Hassoun
- Division of Pediatric Endocrinology, Diabetes and Metabolism, Department of Pediatrics, New York-Presbyterian Morgan Stanley Children's Hospital, New York, New York
| | - Sharon Oberfield
- Division of Pediatric Endocrinology, Diabetes and Metabolism, Department of Pediatrics, New York-Presbyterian Morgan Stanley Children's Hospital, New York, New York
| | - Julie B. Herbstman
- Columbia Center for Children's Environmental Health, Mailman School of Public Health, Columbia University, New York, New York
- Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University, New York, New York
- Address correspondence to: Julie Herbstman, PhD, Columbia Center for Children's Environmental Health, 12th Floor, Mailman School of Public Health, 722 West 168th Street, New York, NY 10032
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16
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Guo S, Zhu L, Majima T, Lei M, Tang H. Reductive Debromination of Polybrominated Diphenyl Ethers: Dependence on Br Number of the Br-Rich Phenyl Ring. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:4433-4439. [PMID: 30912444 DOI: 10.1021/acs.est.8b07050] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Reductive debromination has been widely studied for the degradation of polybrominated diphenyl ethers (PBDEs), although the reaction mechanisms are not so clear. In the present study, the photocatalytic degradation and debromination of ten PBDEs were carried out with CuO/TiO2 nanocomposites as the photocatalyst under an anaerobic condition. The pseudo-first-order rate constants were obtained for the photocatalytic debromination of PBDEs, and their relative rate constants ( kR) were evaluated against kR= 1 for BDE209. Unlike the generally accepted summary that kR is dependent on the total Br number ( N) of PBDEs, kR is found to depend on the Br number on a phenyl ring with more Br atoms than the other one. In other words, a phenyl ring substituted by more Br is more reactive for the reductive debromination. The calculated LUMO energies ( ELUMO) of all PBDEs are well correlated to the more reactive phenyl ring with more Br, compared with the N of two phenyl rings. The result was explained by LUMO localization on the Br-rich phenyl ring, suggesting that the reductive debromination occurs on the phenyl ring.
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Affiliation(s)
- Shun Guo
- Key Laboratory of Material Chemistry for Energy Conversion and Storage (Ministry of Education), School of Chemistry and Chemical Engineering , Huazhong University of Science and Technology , Wuhan 430074 , PR China
| | - Lihua Zhu
- Key Laboratory of Material Chemistry for Energy Conversion and Storage (Ministry of Education), School of Chemistry and Chemical Engineering , Huazhong University of Science and Technology , Wuhan 430074 , PR China
| | - Tetsuro Majima
- Key Laboratory of Material Chemistry for Energy Conversion and Storage (Ministry of Education), School of Chemistry and Chemical Engineering , Huazhong University of Science and Technology , Wuhan 430074 , PR China
| | - Ming Lei
- College of Resources and Environmental Science , South-Central University for Nationalities , Wuhan 430074 , PR China
| | - Heqing Tang
- College of Resources and Environmental Science , South-Central University for Nationalities , Wuhan 430074 , PR China
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17
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Leijs MM, Esser A, Amann PM, Schettgen T, Heise R, Fietkau K, Gube M, Merk HF, Kraus T, Baron JM. Expression of CYP1A1, CYP1B1 and IL-1β in PBMCs and skin samples of PCB exposed individuals. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 642:1429-1438. [PMID: 30045523 DOI: 10.1016/j.scitotenv.2018.06.136] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2018] [Revised: 06/11/2018] [Accepted: 06/11/2018] [Indexed: 06/08/2023]
Abstract
Polychlorinated biphenyls (PCBs) are well- known man-made persistent environmental pollutants and endocrine disruptors. As a result of mass production in the past, background levels of these compounds can be measured in human blood worldwide. In 2010 high internal levels of PCBs were discovered in workers of a transformer-recycling company in Germany. Our aim was to measure, whether the expression of CYP1A1, CYP1B1, and IL-1β is dysregulated in peripheral blood mononuclear cells (PBMCs) of the exposed individuals (n = max 308). Further, we measured the regulation of CYP1A1, CYP1B1, AHRR (aromatic hydrocarbon receptor repressor) and IL-1β in skin samples of 25 workers with elevated plasma PCB levels using quantitative PCR (q-RT-PCR). We found a significant correlation between the regulation of IL-1β in skin samples and lipid adjusted PCB levels. In the PBMCs, the expression levels of CYP1A1, CYP1B1 and IL-1β decreased over time with decreasing PCB plasma levels. The upregulation of the cytokine IL-1β in exposed individuals with higher PCB plasma levels warrants further investigation in order to examine its role in the pathophysiology of autoimmune disorders and tumor promotion.
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Affiliation(s)
- Marike M Leijs
- Department of Dermatology and Allergology, RWTH Aachen University, 52074 Aachen, Germany.
| | - André Esser
- Institute for Occupational and Social Medicine, RWTH Aachen University, 52074 Aachen, Germany
| | - Philipp M Amann
- Department of Dermatology and Allergology, RWTH Aachen University, 52074 Aachen, Germany; Department of Dermatology, SLK Hospital Heilbronn, Germany
| | - Thomas Schettgen
- Institute for Occupational and Social Medicine, RWTH Aachen University, 52074 Aachen, Germany
| | - Ruth Heise
- Department of Dermatology and Allergology, RWTH Aachen University, 52074 Aachen, Germany
| | - Katharina Fietkau
- Department of Dermatology and Allergology, RWTH Aachen University, 52074 Aachen, Germany
| | - Monika Gube
- Institute for Occupational and Social Medicine, RWTH Aachen University, 52074 Aachen, Germany; Health Office of the city and area of Aachen, Trierer Straße 1, 52078 Aachen, Germany
| | - Hans F Merk
- Department of Dermatology and Allergology, RWTH Aachen University, 52074 Aachen, Germany
| | - Thomas Kraus
- Institute for Occupational and Social Medicine, RWTH Aachen University, 52074 Aachen, Germany
| | - Jens M Baron
- Department of Dermatology and Allergology, RWTH Aachen University, 52074 Aachen, Germany
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18
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Knutsen HK, Alexander J, Barregård L, Bignami M, Brüschweiler B, Ceccatelli S, Cottrill B, Dinovi M, Edler L, Grasl-Kraupp B, Hogstrand C, Nebbia CS, Oswald IP, Petersen A, Rose M, Roudot AC, Schwerdtle T, Vleminckx C, Vollmer G, Wallace H, Fürst P, Håkansson H, Halldorsson T, Lundebye AK, Pohjanvirta R, Rylander L, Smith A, van Loveren H, Waalkens-Berendsen I, Zeilmaker M, Binaglia M, Gómez Ruiz JÁ, Horváth Z, Christoph E, Ciccolallo L, Ramos Bordajandi L, Steinkellner H, Hoogenboom LR. Risk for animal and human health related to the presence of dioxins and dioxin-like PCBs in feed and food. EFSA J 2018; 16:e05333. [PMID: 32625737 PMCID: PMC7009407 DOI: 10.2903/j.efsa.2018.5333] [Citation(s) in RCA: 77] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The European Commission asked EFSA for a scientific opinion on the risks for animal and human health related to the presence of dioxins (PCDD/Fs) and DL-PCBs in feed and food. The data from experimental animal and epidemiological studies were reviewed and it was decided to base the human risk assessment on effects observed in humans and to use animal data as supportive evidence. The critical effect was on semen quality, following pre- and postnatal exposure. The critical study showed a NOAEL of 7.0 pg WHO2005-TEQ/g fat in blood sampled at age 9 years based on PCDD/F-TEQs. No association was observed when including DL-PCB-TEQs. Using toxicokinetic modelling and taking into account the exposure from breastfeeding and a twofold higher intake during childhood, it was estimated that daily exposure in adolescents and adults should be below 0.25 pg TEQ/kg bw/day. The CONTAM Panel established a TWI of 2 pg TEQ/kg bw/week. With occurrence and consumption data from European countries, the mean and P95 intake of total TEQ by Adolescents, Adults, Elderly and Very Elderly varied between, respectively, 2.1 to 10.5, and 5.3 to 30.4 pg TEQ/kg bw/week, implying a considerable exceedance of the TWI. Toddlers and Other Children showed a higher exposure than older age groups, but this was accounted for when deriving the TWI. Exposure to PCDD/F-TEQ only was on average 2.4- and 2.7-fold lower for mean and P95 exposure than for total TEQ. PCDD/Fs and DL-PCBs are transferred to milk and eggs, and accumulate in fatty tissues and liver. Transfer rates and bioconcentration factors were identified for various species. The CONTAM Panel was not able to identify reference values in most farm and companion animals with the exception of NOAELs for mink, chicken and some fish species. The estimated exposure from feed for these species does not imply a risk.
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19
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Vuong AM, Braun JM, Webster GM, Thomas Zoeller R, Hoofnagle AN, Sjödin A, Yolton K, Lanphear BP, Chen A. Polybrominated diphenyl ether (PBDE) exposures and thyroid hormones in children at age 3 years. ENVIRONMENT INTERNATIONAL 2018; 117:339-347. [PMID: 29787984 PMCID: PMC5997562 DOI: 10.1016/j.envint.2018.05.019] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2018] [Revised: 05/07/2018] [Accepted: 05/08/2018] [Indexed: 05/06/2023]
Abstract
BACKGROUND Polybrominated diphenyl ethers (PBDEs) reduce serum thyroid hormone concentrations in animal studies, but few studies have examined the impact of early-life PBDE exposures on thyroid hormone disruption in childhood. METHODS We used data from 162 mother-child pairs from the Health Outcomes and Measures of the Environment Study (2003-2006, Cincinnati, OH). We measured PBDEs in maternal serum at 16 ± 3 weeks gestation and in child serum at 1-3 years. Thyroid hormones were measured in serum at 3 years. We used multiple informant models to investigate associations between prenatal and early-life PBDE exposures and thyroid hormone levels at age 3 years. RESULTS Prenatal PBDEs were associated with decreased thyroid stimulating hormone (TSH) levels at age 3 years. A 10-fold increase in prenatal ∑PBDEs (BDE-28, -47, -99, -100, and -153) was associated with a 27.6% decrease (95% CI -40.8%, -11.3%) in TSH. A ten-fold increase in prenatal ∑PBDEs was associated with a 0.25 pg/mL (0.07, 0.43) increase in free triiodothyronine (FT3). Child sex modified associations between prenatal PBDEs and thyroid hormones, with significant decrements in TSH among females and decreased free T4 (FT4) in males. Prenatal ∑PBDEs were not associated with TT4, FT4, or total T3. CONCLUSIONS These findings suggest an inverse relationship between prenatal ∑PBDEs and TSH at 3 years. Associations may be sexually dimorphic, with an inverse relationship between prenatal BDE-47 and -99 and TSH in females and null associations among males.
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Affiliation(s)
- Ann M Vuong
- Division of Epidemiology, Department of Environmental Health, University of Cincinnati College of Medicine, P.O. Box 670056, Cincinnati 45267, OH, USA
| | - Joseph M Braun
- Department of Epidemiology, Brown University School of Public Health, 121 South Main St, Box G-S121-2, Providence 02912, RI, USA
| | - Glenys M Webster
- BC Children's Hospital Research Institute and Faculty of Health Sciences, Simon Fraser University, 8888 University Drive, Burnaby V5A 1S6, BC, Canada
| | - R Thomas Zoeller
- Department of Biology, University of Massachusetts Amherst, 611 North Pleasant St, Amherst 01003, MA, USA
| | - Andrew N Hoofnagle
- Department of Laboratory Medicine, University of Washington, 1959 NE Pacific St, NW120, Seattle 98195, WA, USA
| | - Andreas Sjödin
- Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Mail Stop F-20, 4770 Buford Highway NE, Atlanta 30341, GA, USA
| | - Kimberly Yolton
- Division of General and Community Pediatrics, Department of Pediatrics, Cincinnati Children's Hospital Medical Center, 3333 Burnet Avenue, MLC 7035, Cincinnati 45229, OH, USA
| | - Bruce P Lanphear
- BC Children's Hospital Research Institute and Faculty of Health Sciences, Simon Fraser University, 8888 University Drive, Burnaby V5A 1S6, BC, Canada
| | - Aimin Chen
- Division of Epidemiology, Department of Environmental Health, University of Cincinnati College of Medicine, P.O. Box 670056, Cincinnati 45267, OH, USA.
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Leijs MM, Esser A, Amann PM, Schettgen T, Gube M, Merk HF, Kraus T, Baron JM. Hyperpigmentation and higher incidence of cutaneous malignancies in moderate-high PCB- and dioxin exposed individuals. ENVIRONMENTAL RESEARCH 2018; 164:221-228. [PMID: 29501832 DOI: 10.1016/j.envres.2018.02.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Revised: 01/11/2018] [Accepted: 02/02/2018] [Indexed: 05/11/2023]
Abstract
Polychlorinated biphenyls (PCB) are well known persistent and toxic environmental pollutants. Our aim was to identify effects of moderate-high exposure to dioxin-like (dl) and non-dioxin-like (ndl)-PCBs on the skin in order to provide more insight in the pathophysiological effects of these compounds. We performed a dermatological examination on 92 former workers from a transformer recycling company with known elevated serum PCB and/or dioxin (polychlorinated dibenzo-p-dioxin/polychlorinated dibenzo-p-furan (PCDD/F)) levels. In addition, we performed a skin cancer screening over a period of seven years (2010-2016) on resp. 268, 271, 210, 149, 92, 129 and 79 participants. We found a higher incidence of acne and malignancies of the skin (malignant melanoma, basal cell carcinoma and mycosis fungoides) in the workers compared to normal population. The probability of having hyperpigmentation on the skin was statistically significantly higher in workers with higher sumPCBs- (OR:1.09(1.12-2.17)), dioxin-like (dl)-PCBs- (OR:1.56(1.12-2.17)) and dioxin (PCDD/Fs) (OR:1.09(1.02-1.16)) levels. Age was a confounding factor in this model. Formation of hyperpigmentation could be an indicator for (moderate-high) exposure to toxic compounds like PCBs. The higher incidence of cutaneous malignancies found in the workers might be associated with PCB- and dioxin exposure, warranting further investigation on larger cohorts.
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Affiliation(s)
- Marike M Leijs
- Department of Dermatology and Allergology, RWTH Aachen University, Pauwelstrasse 30, 52074 Aachen, Germany.
| | - André Esser
- Institute of Occupational Medicine, RWTH Aachen University, Pauwelstrasse 30, 52074 Aachen, Germany
| | - Philipp M Amann
- Department of Dermatology and Allergology, RWTH Aachen University, Pauwelstrasse 30, 52074 Aachen, Germany; Department of Dermatology, SLK Hospital Heilbronn, Germany
| | - Thomas Schettgen
- Institute of Occupational Medicine, RWTH Aachen University, Pauwelstrasse 30, 52074 Aachen, Germany
| | - Monika Gube
- Institute of Occupational Medicine, RWTH Aachen University, Pauwelstrasse 30, 52074 Aachen, Germany
| | - Hans F Merk
- Department of Dermatology and Allergology, RWTH Aachen University, Pauwelstrasse 30, 52074 Aachen, Germany
| | - Thomas Kraus
- Institute of Occupational Medicine, RWTH Aachen University, Pauwelstrasse 30, 52074 Aachen, Germany
| | - Jens M Baron
- Department of Dermatology and Allergology, RWTH Aachen University, Pauwelstrasse 30, 52074 Aachen, Germany
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21
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Leijs MM, Koppe JG, Olie K, de Voogt P, van Aalderen WMC, Ten Tusscher GW. Exposure to Environmental Contaminants and Lung Function in Adolescents-Is There a Link? INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2018; 15:ijerph15071352. [PMID: 29954136 PMCID: PMC6069052 DOI: 10.3390/ijerph15071352] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Revised: 06/15/2018] [Accepted: 06/21/2018] [Indexed: 01/20/2023]
Abstract
Dioxins (polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDF)), polychlorinated biphenyls (PCBs), and brominated flame retardants (BDEs) are well known toxic environmental contaminants. Their possible role in the incidence of respiratory disease is not yet well understood. Previous studies showed a negative effect on lung function in relation to prenatal and lactational dioxin exposure in pre-pubertal children. Effects of BDE exposure on the lung function have not previously been evaluated. As part of a longitudinal cohort study, the effects of perinatal dioxin (PCDD/F) exposure and serum PCDD/F, dl-PCB, and BDE levels on lung function in adolescents were assessed using spirometry, a body box, and diffusion measurements. Thirty-three children (born between 1986 and 1991) consented to the current follow-up study. Prenatal, lactational, and current dioxin, PCB, and BDE concentrations were determined using GC-MS. No relationship was seen between prenatal and lactational dioxin exposure, nor with current PCB body burden, and lung function. Indications of increasing airway obstruction were seen in relation to increasing current BDE exposure. This is a novel finding and certainly warrants further research.
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Affiliation(s)
- Marike M Leijs
- Department of Paediatrics and Neonatology, Emma Children's Hospital Amsterdam University Medical Center, 1105 AZ Amsterdam, The Netherlands.
- Ecobaby Foundation, Hollandstraat 6, 3634 AT Loenersloot, The Netherlands.
- Department of Dermatology and Allergology, RTWH University Aachen, Pauwelstrasse 30, 52074 Aachen, Germany.
| | - Janna G Koppe
- Department of Paediatrics and Neonatology, Emma Children's Hospital Amsterdam University Medical Center, 1105 AZ Amsterdam, The Netherlands.
- Ecobaby Foundation, Hollandstraat 6, 3634 AT Loenersloot, The Netherlands.
| | - Kees Olie
- IBED/ESPM, University of Amsterdam, 1090 GE Amsterdam, The Netherlands.
| | - Pim de Voogt
- IBED/ESPM, University of Amsterdam, 1090 GE Amsterdam, The Netherlands.
- KWR Watercycle Research Institute, P.O. Box 1072, 3430 BB Nieuwegein, The Netherlands.
| | - Wim M C van Aalderen
- Department of Paediatrics and Neonatology, Emma Children's Hospital Amsterdam University Medical Center, 1105 AZ Amsterdam, The Netherlands.
| | - Gavin W Ten Tusscher
- Department of Paediatrics and Neonatology, Westfriesgasthuis, Maelsonstraat 3, 1624 NP Hoorn, The Netherlands.
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Mughal BB, Fini JB, Demeneix BA. Thyroid-disrupting chemicals and brain development: an update. Endocr Connect 2018; 7:R160-R186. [PMID: 29572405 PMCID: PMC5890081 DOI: 10.1530/ec-18-0029] [Citation(s) in RCA: 89] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/04/2018] [Accepted: 03/14/2018] [Indexed: 12/12/2022]
Abstract
This review covers recent findings on the main categories of thyroid hormone-disrupting chemicals and their effects on brain development. We draw mostly on epidemiological and experimental data published in the last decade. For each chemical class considered, we deal with not only the thyroid hormone-disrupting effects but also briefly mention the main mechanisms by which the same chemicals could modify estrogen and/or androgen signalling, thereby exacerbating adverse effects on endocrine-dependent developmental programmes. Further, we emphasize recent data showing how maternal thyroid hormone signalling during early pregnancy affects not only offspring IQ, but also neurodevelopmental disease risk. These recent findings add to established knowledge on the crucial importance of iodine and thyroid hormone for optimal brain development. We propose that prenatal exposure to mixtures of thyroid hormone-disrupting chemicals provides a plausible biological mechanism contributing to current increases in the incidence of neurodevelopmental disease and IQ loss.
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Affiliation(s)
- Bilal B Mughal
- CNRS/UMR7221Muséum National d'Histoire Naturelle, Sorbonne Universités, Paris, France
| | - Jean-Baptiste Fini
- CNRS/UMR7221Muséum National d'Histoire Naturelle, Sorbonne Universités, Paris, France
| | - Barbara A Demeneix
- CNRS/UMR7221Muséum National d'Histoire Naturelle, Sorbonne Universités, Paris, France
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23
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Vuong AM, Yolton K, Poston KL, Xie C, Webster GM, Sjödin A, Braun JM, Dietrich KN, Lanphear BP, Chen A. Childhood polybrominated diphenyl ether (PBDE) exposure and executive function in children in the HOME Study. Int J Hyg Environ Health 2018; 221:87-94. [PMID: 29055520 PMCID: PMC5726937 DOI: 10.1016/j.ijheh.2017.10.006] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Revised: 10/13/2017] [Accepted: 10/13/2017] [Indexed: 12/09/2022]
Abstract
Prenatal exposure to polybrominated diphenyl ethers (PBDEs) have been reported to impair executive function in children, but little is known whether childhood PBDE exposures play a role. Using the Health Outcomes and Measures of the Environment (HOME) Study, a prospective birth cohort in the greater Cincinnati area, we investigated the association between repeated measures of PBDEs during childhood and executive function at 8 years in 208 children and whether effect modification by child sex was present. We used child serum collected at 1, 2, 3, 5, and 8 years to measure PBDEs. The Behavior Rating Inventory of Executive Function was completed by parents to assess executive function at 8 years. We used multiple informant models to examine childhood PBDEs during several exposure windows. Null associations were observed between early childhood PBDEs and executive function. However, we observed significant adverse associations between a 10-fold increase in concurrent concentrations of BDE-28 (β=4.6, 95% CI 0.5, 8.7) and BDE-153 (β=4.8, 95% CI 0.8, 8.8) with behavioral regulation. In addition, PBDEs at 8 years were significantly associated with poorer emotional and impulse control. No associations were noted between childhood PBDEs and metacognition or global executive function. However, child sex significantly modified the associations, with significantly poorer executive function among males with higher concurrent BDE-153, and null associations in females. Our study findings suggest that concurrent PBDE exposures during childhood may be associated with poorer executive function, specifically behavior regulation. Males may also be more sensitive to adverse associations of concurrent PBDEs on executive function.
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Affiliation(s)
- Ann M Vuong
- Division of Epidemiology, Department of Environmental Health, University of Cincinnati College of Medicine, P.O. Box 670056, Cincinnati, OH, 45267, USA
| | - Kimberly Yolton
- Division of General and Community Pediatrics, Department of Pediatrics, Cincinnati Children's Hospital Medical Center, 3333 Burnet Avenue, MLC 7035, Cincinnati, OH, 45229, USA
| | - Kendra L Poston
- Division of Epidemiology, Department of Environmental Health, University of Cincinnati College of Medicine, P.O. Box 670056, Cincinnati, OH, 45267, USA
| | - Changchun Xie
- Division of Biostatistics and Bioinformatics, Department of Environmental Health, University of Cincinnati College of Medicine, P.O. Box 670056, Cincinnati, OH, 45267, USA
| | - Glenys M Webster
- BC Children's Hospital Research Institute and Faculty of Health Sciences, Simon Fraser University, 8888 University Drive, Burnaby, BC, V5A 1S6, Canada
| | - Andreas Sjödin
- Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Mail Stop F-20, 4770 Buford Highway NE, Atlanta, GA, 30341, USA
| | - Joseph M Braun
- Department of Epidemiology, Brown University School of Public Health, 121 South Main St, Box G-S121-2, Providence, RI, 02912, USA
| | - Kim N Dietrich
- Division of Epidemiology, Department of Environmental Health, University of Cincinnati College of Medicine, P.O. Box 670056, Cincinnati, OH, 45267, USA
| | - Bruce P Lanphear
- BC Children's Hospital Research Institute and Faculty of Health Sciences, Simon Fraser University, 8888 University Drive, Burnaby, BC, V5A 1S6, Canada
| | - Aimin Chen
- Division of Epidemiology, Department of Environmental Health, University of Cincinnati College of Medicine, P.O. Box 670056, Cincinnati, OH, 45267, USA.
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NTP Research Report on Biological Activity of Bisphenol A (BPA) Structural Analogues and Functional Alternatives. ACTA ACUST UNITED AC 2017. [DOI: 10.22427/ntp-rr-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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25
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Dien NT, Hirai Y, Sakai SI. Correlation between Atmospheric Boundary Layer Height and Polybrominated Diphenyl Ether Concentrations in Air. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2017; 51:356-364. [PMID: 27959529 DOI: 10.1021/acs.est.6b03004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
In this study, we aim to determine the correlation between the height of the atmospheric boundary layer (ABL) and the concentrations of polybrominated diphenyl ether (PBDE) congeners, in an effort to improve comprehension of the atmospheric behavior of PBDEs. We used the PBDE data in air (n = 298), which were measured by the Japan Ministry of Environment (JMOE) at 50 sites across Japan during the period 2009-2012. The height of the ABL, which directly affects the PBDE concentrations in the near-surface air, was estimated by employing data retrieved from the Japanese global reanalysis (JRA-55) database, using the parcel and Richardson number method. The ABL has shown a strong inverse relationship with BDE-47 and BDE-99 (p < 0.01). In contrast, there was less correlation between BDE-209 and the ABL (p = 0.258). These differing behaviors could be explained by differences in particle size distribution of PBDEs, where BDE-47 and BDE-99 are associated with gas phases and fine particles and BDE-209 is associated with coarse particles. To our knowledge, this paper represents the first large-scale analysis of correlations between the ABL and the concentrations of PBDEs in the air.
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Affiliation(s)
- Nguyen Thanh Dien
- Environment Preservation Research Center, Kyoto University , Sakyo-ku, Kyoto 606-8501, Japan
| | - Yasuhiro Hirai
- Environment Preservation Research Center, Kyoto University , Sakyo-ku, Kyoto 606-8501, Japan
| | - Shin-Ichi Sakai
- Environment Preservation Research Center, Kyoto University , Sakyo-ku, Kyoto 606-8501, Japan
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Soechitram SD, Berghuis SA, Visser TJ, Sauer PJJ. Polychlorinated biphenyl exposure and deiodinase activity in young infants. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 574:1117-1124. [PMID: 27710904 DOI: 10.1016/j.scitotenv.2016.09.098] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Revised: 08/22/2016] [Accepted: 09/12/2016] [Indexed: 06/06/2023]
Abstract
BACKGROUND Several studies have shown effects of polychlorinated biphenyls (PCBs) on serum thyroid hormone levels in pregnant woman and their infants, while other studies did not find such effects. How PCBs might affect thyroid hormone metabolism, is still unclear. Potential mechanisms are direct influence on the thyroid gland, binding to thyroid binding proteins, increased excretion or metabolism of thyroid hormones by deiodinases or sulfatases. It is also not well known whether the effect on thyroid hormone levels is caused by PCBs themselves, or by their hydroxylated metabolites (OH-PCBs). OBJECTIVE To determine the effects of perinatal exposure to PCBs and OH-PCBs on thyroid hormone levels in cord blood and in serum of newborn infants. METHODS In a Dutch cohort of 100 mother-infant pairs, exposed to background PCB levels, correlations were assessed between 10 PCBs and 6 OH-PCBs in maternal blood during pregnancy and serum thyroxine (T4), T4 sulfate (T4S), triiodothyronine (T3), reverse T3 (rT3), thyroid-stimulating hormone (TSH) and thyroxine-binding globulin (TBG) levels in cord blood and in serum of three- and 18-month-old infants. We corrected for age of the mother, gestational age, gender and type of feeding. RESULTS After correction, prenatal levels of three of 10 measured PCBs showed a positive correlation with cord serum T3, and four PCBs showed a negative correlation with cord serum rT3. After correction, two PCBs and the sum of the 10 measured PCBs were positively correlated with the cord serum T3/rT3 ratio, an indicator of deiodinase 3 activity. No correlations were found between PCBs and T4, TSH and TBG in cord blood. 4-OH-PCB-107 was correlated with T4 at 3months and T4, T4S and T3 at 18months. CONCLUSION Our results suggest that PCBs have a negative effect on deiodinase type 3 activity, as reflected by a positive correlation with the T3/rT3 ratio. We identified a potential mechanism by which PCBs may affect thyroid hormone metabolism during human development.
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Affiliation(s)
- Shalini D Soechitram
- Division of Neonatology, Department of Pediatrics, Beatrix Children's Hospital, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Sietske A Berghuis
- Division of Neonatology, Department of Pediatrics, Beatrix Children's Hospital, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands.
| | - Theo J Visser
- Department of Internal Medicine, Erasmus Medical Centre, Rotterdam, The Netherlands
| | - Pieter J J Sauer
- Division of Neonatology, Department of Pediatrics, Beatrix Children's Hospital, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
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Chatzitomaris A, Hoermann R, Midgley JE, Hering S, Urban A, Dietrich B, Abood A, Klein HH, Dietrich JW. Thyroid Allostasis-Adaptive Responses of Thyrotropic Feedback Control to Conditions of Strain, Stress, and Developmental Programming. Front Endocrinol (Lausanne) 2017; 8:163. [PMID: 28775711 PMCID: PMC5517413 DOI: 10.3389/fendo.2017.00163] [Citation(s) in RCA: 89] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Accepted: 06/27/2017] [Indexed: 12/21/2022] Open
Abstract
The hypothalamus-pituitary-thyroid feedback control is a dynamic, adaptive system. In situations of illness and deprivation of energy representing type 1 allostasis, the stress response operates to alter both its set point and peripheral transfer parameters. In contrast, type 2 allostatic load, typically effective in psychosocial stress, pregnancy, metabolic syndrome, and adaptation to cold, produces a nearly opposite phenotype of predictive plasticity. The non-thyroidal illness syndrome (NTIS) or thyroid allostasis in critical illness, tumors, uremia, and starvation (TACITUS), commonly observed in hospitalized patients, displays a historically well-studied pattern of allostatic thyroid response. This is characterized by decreased total and free thyroid hormone concentrations and varying levels of thyroid-stimulating hormone (TSH) ranging from decreased (in severe cases) to normal or even elevated (mainly in the recovery phase) TSH concentrations. An acute versus chronic stage (wasting syndrome) of TACITUS can be discerned. The two types differ in molecular mechanisms and prognosis. The acute adaptation of thyroid hormone metabolism to critical illness may prove beneficial to the organism, whereas the far more complex molecular alterations associated with chronic illness frequently lead to allostatic overload. The latter is associated with poor outcome, independently of the underlying disease. Adaptive responses of thyroid homeostasis extend to alterations in thyroid hormone concentrations during fetal life, periods of weight gain or loss, thermoregulation, physical exercise, and psychiatric diseases. The various forms of thyroid allostasis pose serious problems in differential diagnosis of thyroid disease. This review article provides an overview of physiological mechanisms as well as major diagnostic and therapeutic implications of thyroid allostasis under a variety of developmental and straining conditions.
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Affiliation(s)
- Apostolos Chatzitomaris
- Medical Department I, Endocrinology and Diabetology, Bergmannsheil University Hospitals, Ruhr University of Bochum, Bochum, Germany
- *Correspondence: Apostolos Chatzitomaris,
| | - Rudolf Hoermann
- Private Consultancy, Research and Development, Yandina, QLD, Australia
| | | | - Steffen Hering
- Department for Internal Medicine, Cardiology, Endocrinology, Diabetes and Medical Intensive Care Medicine, Krankenhaus Bietigheim-Vaihingen, Bietigheim-Bissingen, Germany
| | - Aline Urban
- Department for Anesthesiology, Intensive Care and Palliative Medicine, Eastern Allgäu-Kaufbeuren Hospitals, Kaufbeuren, Germany
| | | | - Assjana Abood
- Medical Department I, Endocrinology and Diabetology, Bergmannsheil University Hospitals, Ruhr University of Bochum, Bochum, Germany
| | - Harald H. Klein
- Medical Department I, Endocrinology and Diabetology, Bergmannsheil University Hospitals, Ruhr University of Bochum, Bochum, Germany
- Ruhr Center for Rare Diseases (CeSER), Ruhr University of Bochum and Witten/Herdecke University, Bochum, Germany
| | - Johannes W. Dietrich
- Medical Department I, Endocrinology and Diabetology, Bergmannsheil University Hospitals, Ruhr University of Bochum, Bochum, Germany
- Ruhr Center for Rare Diseases (CeSER), Ruhr University of Bochum and Witten/Herdecke University, Bochum, Germany
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Esser A, Schettgen T, Gube M, Koch A, Kraus T. Association between polychlorinated biphenyls and diabetes mellitus in the German HELPcB cohort. Int J Hyg Environ Health 2016; 219:557-65. [DOI: 10.1016/j.ijheh.2016.06.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2015] [Revised: 05/31/2016] [Accepted: 06/01/2016] [Indexed: 10/21/2022]
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Jacobson MH, Barr DB, Marcus M, Muir AB, Lyles RH, Howards PP, Pardo L, Darrow LA. Serum polybrominated diphenyl ether concentrations and thyroid function in young children. ENVIRONMENTAL RESEARCH 2016; 149:222-230. [PMID: 27228485 PMCID: PMC4907865 DOI: 10.1016/j.envres.2016.05.022] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2016] [Revised: 05/12/2016] [Accepted: 05/16/2016] [Indexed: 05/22/2023]
Abstract
Thyroid hormones are essential for proper neurodevelopment in early life. There is evidence that exposure to polybrominated diphenyl ethers (PBDEs) affects thyroid function, but previous studies have been inconsistent, and no studies among children have been conducted in the United States where PBDE levels are particularly high. Serum levels of seven PBDE congeners and thyroid hormones and other thyroid parameters were measured in 80 children aged 1-5 years from the southeastern United States between 2011 and 2012. Parents of the children completed questionnaires with details on demographics and behaviors. Multivariate linear regression models were used to estimate the associations between serum PBDE levels, expressed as quartiles and as log-transformed continuous variables, and markers of thyroid function. BDE-47, 99, 100 and 153 were detected in >60% of samples, and were summed (∑PBDE). PBDE congeners and ∑PBDE were positively associated with thyroid-stimulating hormone (TSH). A log-unit increase in ∑PBDE was associated with a 22.1% increase in TSH (95% CI: 2.0%, 47.7%). Compared with children in the lowest quartile of ∑PBDE exposure, children in higher quartiles had greater TSH concentrations as modeled on the log-scale (second quartile: β=0.32, 95% confidence interval (CI): -0.09, 0.74; third quartile: β=0.44, 95% CI: 0.04, 0.85; and fourth quartile: β=0.49, 95% CI: 0.09, 0.89). There was also a tendency toward lower total T4 and higher free T3 with increasing PBDE exposure. Results suggest that exposure to PBDEs during childhood subclinically disrupts thyroid hormone function, with impacts in the direction of hypothyroidism.
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Affiliation(s)
- Melanie H Jacobson
- Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, GA 30322, USA.
| | - Dana B Barr
- Department of Environmental Health, Rollins School of Public Health, Emory University, Atlanta, GA 30322, USA.
| | - Michele Marcus
- Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, GA 30322, USA; Department of Environmental Health, Rollins School of Public Health, Emory University, Atlanta, GA 30322, USA.
| | - Andrew B Muir
- Department of Pediatrics, Division of Endocrinology, Emory University School of Medicine, Atlanta, GA 30322, USA.
| | - Robert H Lyles
- Department of Biostatistics and Bioinformatics, Rollins School of Public Health, Emory University, Atlanta, GA 30322, USA.
| | - Penelope P Howards
- Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, GA 30322, USA.
| | - Larissa Pardo
- National Center for Environmental Assessment, U.S. Environmental Protection Agency, Washington, DC 20004, USA.
| | - Lyndsey A Darrow
- Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, GA 30322, USA; Department of Environmental Health, Rollins School of Public Health, Emory University, Atlanta, GA 30322, USA; School of Community Health Sciences, University of Nevada, Reno, NV 89557, USA.
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Schang G, Robaire B, Hales BF. Organophosphate Flame Retardants Act as Endocrine-Disrupting Chemicals in MA-10 Mouse Tumor Leydig Cells. Toxicol Sci 2016; 150:499-509. [PMID: 26794138 DOI: 10.1093/toxsci/kfw012] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
The organophosphate flame retardants (OPFRs) have emerged as alternatives to banned brominated flame retardants but little is known about their possible activity as endocrine disruptors. Our goal was to compare the effects of 7 commonly used OPFRsin vitroon MA-10 mouse Leydig tumor cells to those of a major brominated flame retardant, 2,2',4,4'-tetrabromodiphenyl ether (BDE-47). The effects of OPFRs and BDE-47 on mitochondrial activity, cell counts, oxidative stress, steroid secretion and gene expression were investigated. BDE-47 and all 7 OPFRs tested significantly reduced MA-10 cell mitochondrial activity (concentrations ≥50 μM) and cell number (concentrations ≥10 μM). All of the OPFRs significantly increased (10 μM, 1.7-4.4-fold) superoxide production whereas BDE-47 had no significant effect. Basal progesterone production was significantly increased (10 μM, 1.5 to 3-fold) by 2-ethylhexyl diphenyl phosphate, isodecyl diphenyl phosphate, isopropylated triphenyl phosphate, tert-butylphenyl diphenyl phosphate, and tricresyl phosphate, while BDE-47, triphenyl phosphate and tri-o-cresyl phosphate had no effect. Interestingly, isopropylated triphenyl phosphate enhanced dbcAMP-stimulated steroid production (∼2-fold), while tri-o-cresyl phosphate decreased (∼2/3) LH-stimulated steroid production. Several OPFRs affected the expression of genes involved in the biosynthesis of progesterone. In conclusion, all the OPFRs tested affected mitochondrial activity, cell survival, and superoxide production. Basal or stimulated steroid secretion was affected by all of the OPFRs except triphenyl phosphate; BDE-47 had no effect. Hence, the OPFRs currently used as alternatives affect Leydig cells to a greater extent than the brominated flame retardants that they have replaced.
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Affiliation(s)
| | - Bernard Robaire
- *Department of Pharmacology and Therapeutics and Department of Obstetrics and Gynecology, McGill University, Montreal, Quebec H3G 1Y6, Canada
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Xu P, Lou X, Ding G, Shen H, Wu L, Chen Z, Han J, Wang X. Effects of PCBs and PBDEs on thyroid hormone, lymphocyte proliferation, hematology and kidney injury markers in residents of an e-waste dismantling area in Zhejiang, China. THE SCIENCE OF THE TOTAL ENVIRONMENT 2015. [PMID: 26218560 DOI: 10.1016/j.scitotenv.2015.07.025] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs) are two typical categories of contaminants released from e-waste dismantling environments. In China, the body burdens of PCBs and PBDEs are associated with abnormal thyroid hormones in populations from e-waste dismantling sites, but the results are limited and contradictory. In this study, we measured the serum levels of PCBs and PBDEs and the thyroid hormone free triiodothyronine (FT3), free thyroxine (FT4) and thyroid-stimulating hormone (TSH) in 40 residents in an e-waste dismantling area and in 15 residents in a control area. Additionally, we also measured some lymphocyte proliferation indexes, hematologic parameters and kidney injury markers, including white blood cells, neutrophils, monocytes, lymphocytes, hemoglobin, platelets, serum creatinine and beta 2-microglobulin (β2-MG). The results indicated that the mean level of ΣPCBs in the exposure group was significantly higher than that in the control group (964.39 and 67.98 ng g(-1), p<0.0001), but the mean level of ΣPBDEs in the exposure group was not significantly higher than that in the controls (139.32 vs. 75.74 ng g(-1), p>0.05). We determined that serum levels of FT3, FT4, monocytes and lymphocytes were significantly lower, whereas the levels of neutrophils, hemoglobin, platelets and serum creatinine were significantly higher in the exposed group (p<0.05). The mean level of ΣPCBs was negatively correlated with levels of FT3, FT4, monocytes and lymphocytes (p<0.05) and positively correlated with levels of neutrophils, hemoglobin, serum creatinine and β2-MG (p<0.05). Additionally, the mean level of ΣPBDEs was positively correlated with levels of white blood cells, hemoglobin and platelets (p<0.05). Our data suggest that exposure to an e-waste dismantling environment may increase the body burdens of PCBs and the specific PBDEs congeners in native residents and that the contaminants released from e-waste may contribute to abnormal changes in body levels of thyroid hormone, hematology and kidney injury markers.
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Affiliation(s)
- Peiwei Xu
- Zhejiang Provincial Center for Disease Control and Prevention, 3399 Bin Sheng Road, Binjiang District, Hangzhou 310051, China.
| | - Xiaoming Lou
- Zhejiang Provincial Center for Disease Control and Prevention, 3399 Bin Sheng Road, Binjiang District, Hangzhou 310051, China
| | - Gangqiang Ding
- Zhejiang Provincial Center for Disease Control and Prevention, 3399 Bin Sheng Road, Binjiang District, Hangzhou 310051, China.
| | - Haitao Shen
- Zhejiang Provincial Center for Disease Control and Prevention, 3399 Bin Sheng Road, Binjiang District, Hangzhou 310051, China
| | - Lizhi Wu
- Zhejiang Provincial Center for Disease Control and Prevention, 3399 Bin Sheng Road, Binjiang District, Hangzhou 310051, China
| | - Zhijian Chen
- Zhejiang Provincial Center for Disease Control and Prevention, 3399 Bin Sheng Road, Binjiang District, Hangzhou 310051, China
| | - Jianlong Han
- Zhejiang Provincial Center for Disease Control and Prevention, 3399 Bin Sheng Road, Binjiang District, Hangzhou 310051, China
| | - Xiaofeng Wang
- Zhejiang Provincial Center for Disease Control and Prevention, 3399 Bin Sheng Road, Binjiang District, Hangzhou 310051, China.
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Putschögl FM, Gaum PM, Schettgen T, Kraus T, Gube M, Lang J. Effects of occupational exposure to polychlorinated biphenyls on urinary metabolites of neurotransmitters: A cross-sectional and longitudinal perspective. Int J Hyg Environ Health 2015; 218:452-60. [PMID: 25869187 DOI: 10.1016/j.ijheh.2015.03.009] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2014] [Revised: 03/18/2015] [Accepted: 03/21/2015] [Indexed: 10/23/2022]
Abstract
BACKGROUND Polychlorinated biphenyls (PCBs) are chemicals which were used for industrial purposes and are known to induce various adverse health effects. They are also known to be neurotoxic and numerous targets within the central nervous system have been identified in previous studies. Specifically, the neurotransmitters dopamine (DA) and norepinephrine (NE) are influenced by PCBs as indicated in studies involving animals. However, limited evidence has been published documenting PCB induced changes in the neurotransmitter system in humans. OBJECTIVE In the present study, we examined the association between a higher PCB body burden following occupational exposure and possible changes in human neurotransmitter metabolites. METHODS Within a medical surveillance programme called HELPcB (Health Effects in High-Level Exposure to PCB) that monitors adverse health effects of occupational PCB exposure, urine samples were obtained (n(T1) = 166; n(T2) = 177 and n(T3) = 141). The urinary concentrations of the metabolites homovanillic acid (HVA; for DA) and vanillylmandelic acid (VMA; for NE) were analyzed. Blood samples were obtained by vena puncture in order to determine the internal exposure to PCBs with human biomonitoring. RESULTS A cross-sectional analysis indicated a significant negative effect of PCB exposure on HVA and VMA. Longitudinally, an initially higher exposure to higher chlorinated PCBs was followed by constant reduced HVA level over three consecutive years. Exploratory analyses show different long-term effects for different PCBs according to their chlorination degree. A higher exposure with lower chlorinated PCBs leads to an increase of VMA and HVA. Conversely, a higher exposure to all PCBs results in a reduction of HVA. CONCLUSION This study, to our knowledge, is the first to document changes in neurotransmitter metabolites after occupational PCB exposure in humans. This finding advances evidence obtained from past research, and identifies one potential pathomechanism in the central dopaminergic system of humans.
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Affiliation(s)
| | - Petra Maria Gaum
- Institute of Occupational Medicine, RWTH Aachen University, Germany
| | - Thomas Schettgen
- Institute of Occupational Medicine, RWTH Aachen University, Germany
| | - Thomas Kraus
- Institute of Occupational Medicine, RWTH Aachen University, Germany
| | - Monika Gube
- Institute of Occupational Medicine, RWTH Aachen University, Germany
| | - Jessica Lang
- Institute of Occupational Medicine, RWTH Aachen University, Germany
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Xu X, Chiung YM, Lu F, Qiu S, Ji M, Huo X. Associations of cadmium, bisphenol A and polychlorinated biphenyl co-exposure in utero with placental gene expression and neonatal outcomes. Reprod Toxicol 2015; 52:62-70. [PMID: 25687722 DOI: 10.1016/j.reprotox.2015.02.004] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2014] [Revised: 02/02/2015] [Accepted: 02/06/2015] [Indexed: 02/05/2023]
Abstract
In utero co-exposure to endocrine disrupting compounds can perturb fetal development. However, the effect of co-exposure on pivotal regulatory genes has seldom been investigated. We explored the effects of in utero co-exposure to cadmium (Cd), bisphenol A (BPA) and polychlorinated biphenyls (PCBs) on master regulator genes. We recruited 284 healthy pregnant women, of whom 262 provided both cord blood and placenta samples, and 200 had all measurements taken. Placental Cd, cord blood BPA and total PCBs in the exposed group were higher than a reference group. KISS1 expression level in placental tissue was threefold higher in the exposed group than in the reference, and was positively associated with all toxicants. Leptin and leptin receptor expression were also significantly higher, but were only associated with BPA. From our findings, we conclude that lower birth weight is correlated with Cd and PCBs, and may result from the increased KISS1 mRNA expression.
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Affiliation(s)
- Xijin Xu
- Laboratory of Environmental Medicine and Developmental Toxicology, and Provincial Key Laboratory of Infectious Diseases and Molecular Immunopathology, Shantou University Medical College, Shantou, Guangdong, China; Department of Cell Biology and Genetics, Shantou University Medical College, Shantou, Guangdong, China
| | - Yin Mei Chiung
- Laboratory of Environmental Medicine and Developmental Toxicology, and Provincial Key Laboratory of Infectious Diseases and Molecular Immunopathology, Shantou University Medical College, Shantou, Guangdong, China
| | - Fangfang Lu
- Laboratory of Environmental Medicine and Developmental Toxicology, and Provincial Key Laboratory of Infectious Diseases and Molecular Immunopathology, Shantou University Medical College, Shantou, Guangdong, China
| | - Shaoshan Qiu
- Laboratory of Environmental Medicine and Developmental Toxicology, and Provincial Key Laboratory of Infectious Diseases and Molecular Immunopathology, Shantou University Medical College, Shantou, Guangdong, China
| | - Minhui Ji
- Laboratory of Environmental Medicine and Developmental Toxicology, and Provincial Key Laboratory of Infectious Diseases and Molecular Immunopathology, Shantou University Medical College, Shantou, Guangdong, China
| | - Xia Huo
- Laboratory of Environmental Medicine and Developmental Toxicology, and Provincial Key Laboratory of Infectious Diseases and Molecular Immunopathology, Shantou University Medical College, Shantou, Guangdong, China.
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Tezuka Y, Herai N, Inomata Y, Kagami K, Yamauchi J, Nishigori H, Sanbe A. Upregulation of inorganic pyrophosphatase 1 as a JNK phosphatase in hypothyroid embryonic chick cerebellum. Life Sci 2015; 128:94-100. [PMID: 25748422 DOI: 10.1016/j.lfs.2015.02.019] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2014] [Revised: 02/02/2015] [Accepted: 02/20/2015] [Indexed: 10/23/2022]
Abstract
AIM Thyroid hormones play important roles in vertebrate neuronal development and differentiation. In our previous study, we showed that fetal thyroid dysfunction led to impaired social behaviors of hatchlings on post-hatch day 3, as well as to impaired learning and memory determined by the imprinting preference. However, little is known about the mechanisms underlying the direct adverse effects of fetal thyroid dysfunction on neuronal development. MATERIALS AND METHODS We used a chick embryo as a fetal model to investigate the effects of prenatal exposure to antithyroid drugs on neuronal development in the chick cerebellum. Methimazole (MMI) at a dose of 20μmol/egg was administered to eggs on day 14, while the control was given only a vehicle. In order to address the underlying mechanisms of the impaired behavior, proteomic approaches were employed in the chick cerebellum two days after MMI treatment. KEY FINDINGS In this experiment, we found that inorganic pyrophosphatase 1 (PPA1) was upregulated in the chick cerebellum treated with MMI, and we confirmed this upregulation of PPA1 by Western blot analysis as well as by RT-PCR analysis. Concomitant with the upregulation of PPA1, a marked reduction in JNK activity, as well as of phospho-JNK level, was detected in the MMI-treated chick cerebellum. SIGNIFICANCE Since PPA1 can dephosphorylate JNK, these results suggest that the upregulation of PPA1 during neuronal development in the hypothyroid chick cerebellum may lead to impaired social behaviors as well as to impaired learning and memory via JNK dephosphorylation and inactivation in the chick cerebellum.
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Affiliation(s)
- Yu Tezuka
- Department of Pharmacotherapeutics, School of Pharmacy, Iwate Medical University, Iwate 028-3694, Japan
| | - Natsumi Herai
- Department of Pharmacotherapeutics, School of Pharmacy, Iwate Medical University, Iwate 028-3694, Japan
| | - Yui Inomata
- Department of Pharmacotherapeutics, School of Pharmacy, Iwate Medical University, Iwate 028-3694, Japan
| | - Keisuke Kagami
- Department of Pharmacotherapeutics, School of Pharmacy, Iwate Medical University, Iwate 028-3694, Japan
| | - Junji Yamauchi
- Department of Pharmacology, National Research Institute for Child Health and Development, Tokyo 157-8535, Japan
| | - Hideo Nishigori
- Department of Pharmacotherapeutics, School of Pharmacy, Iwate Medical University, Iwate 028-3694, Japan
| | - Atsushi Sanbe
- Department of Pharmacotherapeutics, School of Pharmacy, Iwate Medical University, Iwate 028-3694, Japan.
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Okonski K, Degrendele C, Melymuk L, Landlová L, Kukučka P, Vojta Š, Kohoutek J, Čupr P, Klánová J. Particle size distribution of halogenated flame retardants and implications for atmospheric deposition and transport. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2014; 48:14426-14434. [PMID: 25380095 DOI: 10.1021/es5044547] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
This study investigates the distribution of polybrominated diphenyl ethers (PBDEs), hexabromocyclododecane (HBCD) and a group of novel flame retardants (NFRs) on atmospheric aerosols. Two high volume cascade impactors were used to collect particulate fractions of ambient air over a one year period at urban and rural sites. The majority of FRs were found on the finest aerosols (<0.95 μm). Concentrations of HBCD were higher than those of ΣPBDEs. Moreover, we noted seasonality and spatial differences in particle size distributions, yet a large portion of the observed differences were due to differences in particulate matter (PM) itself. When normalized by PM, the size distributions of the FRs exhibited much greater heterogeneity. Differences existed between the FR distributions by molecular weight, with the higher molecular weight FRs (e.g., BDE-209, Dechlorane Plus) distributed more uniformly across all particulate size fractions. The seasonal, spatial, and compound-specific differences are of crucial importance when estimating dry and wet deposition of FRs as smaller aerosols have longer atmospheric residence times. Estimated wet and dry deposition of four representative FRs (BDE-47, BDE-209, HBCD, and Dechlorane Plus) using size-segregated aerosol data resulted in lower deposition estimates than when bulk aerosol data were used. This has implications for estimates of long-range atmospheric transport and atmospheric residence times, as it suggests that without size-specific distributions, these parameters could be underestimated for FRs.
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Affiliation(s)
- Krzysztof Okonski
- Masaryk University , Faculty of Science, RECETOX (Research Centre for Toxic Compounds in the Environment), Kamenice 753/5, 625 00 Brno, Czech Republic
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Exposure to polybrominated diphenyl ethers and male reproductive function in Greenland, Poland and Ukraine. Reprod Toxicol 2014; 43:1-7. [PMID: 24513925 DOI: 10.1016/j.reprotox.2013.10.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2013] [Revised: 09/19/2013] [Accepted: 10/08/2013] [Indexed: 11/22/2022]
Abstract
Animal and a few human studies suggest that polybrominated diphenyl ethers (PBDEs) may affect male reproductive function. The aim of the present study was to evaluate if male reproductive function was associated with serum level of PBDEs. We evaluated, in a cross-sectional study, the effects of environmental exposure to BDE-47 and BDE-153 on reproductive hormones and semen quality, including markers of DNA damage and apoptosis, in 299 spouses of pregnant women from Greenland, Poland and Ukraine. Adjusted linear regression models indicated no strong associations between BDE-47 or BDE-153 exposure and markers of male semen quality or reproductive hormones. In the largest study to date we demonstrate that BDE-47 and BDE-153 exposure was not associated with altered semen characteristics or reproductive hormones, indicating that male reproductive function is not affected by the exposure level of these compounds in fertile European or Arctic populations.
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Passatore L, Rossetti S, Juwarkar AA, Massacci A. Phytoremediation and bioremediation of polychlorinated biphenyls (PCBs): state of knowledge and research perspectives. JOURNAL OF HAZARDOUS MATERIALS 2014; 278:189-202. [PMID: 24976127 DOI: 10.1016/j.jhazmat.2014.05.051] [Citation(s) in RCA: 150] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2014] [Revised: 05/15/2014] [Accepted: 05/16/2014] [Indexed: 05/20/2023]
Abstract
This review summarizes the bioremediation and phytoremediation technologies proposed so far to detoxify PCB-contaminated sites. A critical analysis about the potential and limits of the PCB pollution treatment strategies by means of plants, fungi and bacteria are elucidated, including the new insights emerged from recent studies on the rhizosphere potential and on the implementation of simultaneous aerobic and anaerobic biodegradation processes. The review describes the biodegradation and phytoremediation processes and elaborates on the environmental variables affecting contaminant degradation rates, summarizing the amendments recommended to enhance PCB degradation. Additionally, issues connected with PCB toxicology, actual field remediation strategies and economical evaluation are discussed.
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Affiliation(s)
- Laura Passatore
- Institute of Agro-environment and Forest Biology (IBAF), National Research Council (CNR), Via Salaria Km 29.300, 00015 Monterotondo (Rome), Italy; Department for Innovation in Biological, Agro-Food and Forest Systems (DIBAF), University of Tuscia, Via S. Camillo de Lellis snc, 01100 Viterbo, Italy
| | - Simona Rossetti
- Water Research Institute (IRSA), National Research Council (CNR), Via Salaria Km 29.300, 00015 Monterotondo (Rome), Italy
| | - Asha A Juwarkar
- Environmental Biotechnology Division, National Environmental Engineering Research Institute (NEERI), Nehru Marg, Nagpur 440 020, India
| | - Angelo Massacci
- Institute of Agro-environment and Forest Biology (IBAF), National Research Council (CNR), Via Salaria Km 29.300, 00015 Monterotondo (Rome), Italy.
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Préau L, Fini JB, Morvan-Dubois G, Demeneix B. Thyroid hormone signaling during early neurogenesis and its significance as a vulnerable window for endocrine disruption. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2014; 1849:112-21. [PMID: 24980696 DOI: 10.1016/j.bbagrm.2014.06.015] [Citation(s) in RCA: 76] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2014] [Revised: 06/14/2014] [Accepted: 06/20/2014] [Indexed: 12/11/2022]
Abstract
The essential roles of thyroid hormone (TH) in perinatal brain development have been known for decades. More recently, many of the molecular mechanisms underlying the multiple effects of TH on proliferation, differentiation, migration, synaptogenesis and myelination in the developing nervous system have been elucidated. At the same time data from both epidemiological studies and animal models have revealed that the influence of thyroid signaling on development of the nervous system, extends to all periods of life, from early embryogenesis to neurogenesis in the adult brain. This review focuses on recent insights into the actions of TH during early neurogenesis. A key concept is that, in contrast to the previous ideas that only the unliganded receptor was implicated in these early phases, a critical role of the ligand, T3, is increasingly recognized. These findings are considered in the light of increasing knowledge of cell specific control of T3 availability as a function of deiodinase activity and transporter expression. These requirements for TH in the early stages of neurogenesis take on new relevance given the increasing epidemiological data on adverse effects of TH lack in early pregnancy on children's neurodevelopmental outcome. These ideas lead logically into a discussion on how the actions of TH during the first phases of neurogenesis can be potentially disrupted by gestational iodine lack and/or chemical pollution. This article is part of a Special Issue entitled: Nuclear receptors in animal development.
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Affiliation(s)
- Laetitia Préau
- UMR CNRS 7221, Evolution des Régulations Endocriniennes, Département Régulations, Développement et Diversité Moléculaire, Muséum National d'Histoire Naturelle, 75231 Paris, France
| | - Jean Baptiste Fini
- UMR CNRS 7221, Evolution des Régulations Endocriniennes, Département Régulations, Développement et Diversité Moléculaire, Muséum National d'Histoire Naturelle, 75231 Paris, France
| | - Ghislaine Morvan-Dubois
- UMR CNRS 7221, Evolution des Régulations Endocriniennes, Département Régulations, Développement et Diversité Moléculaire, Muséum National d'Histoire Naturelle, 75231 Paris, France
| | - Barbara Demeneix
- UMR CNRS 7221, Evolution des Régulations Endocriniennes, Département Régulations, Développement et Diversité Moléculaire, Muséum National d'Histoire Naturelle, 75231 Paris, France.
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Jebali J, Chicano-Gálvez E, Fernández-Cisnal R, Banni M, Chouba L, Boussetta H, López-Barea J, Alhama J. Proteomic analysis in caged Mediterranean crab (Carcinus maenas) and chemical contaminant exposure in Téboulba Harbour, Tunisia. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2014; 100:15-26. [PMID: 24433786 DOI: 10.1016/j.ecoenv.2013.11.025] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2013] [Revised: 11/19/2013] [Accepted: 11/21/2013] [Indexed: 06/03/2023]
Abstract
This study uses proteomics approach to assess the toxic effects of contaminants in the Mediterranean crab (Carcinus maenas) after transplantation into Téboulba fishing harbour. High levels of aliphatic and aromatic hydrocarbons were detected in sediments. Although their effects on vertebrates are well described, little is known about their early biological effects in marine invertebrates under realistic conditions. Protein expression profiles of crabs caged for 15, 30 and 60 days were compared to unexposed animals. Nineteen proteins with significant expression differences were identified by capLC-µESI-IT MS/MS and homology search on databases. Differentially expressed proteins were assigned to five different categories of biological function including: (1) chitin catabolism, (2) proteolysis, (3) exoskeleton biosynthesis, (4) protein folding and stress response, and (5) transport. The proteins showing major expression changes in C. maenas after different caging times may be considered as novel molecular biomarkers for effectively biomonitoring aquatic environment contamination.
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Affiliation(s)
- Jamel Jebali
- Laboratory of Biochemical and Environmental Toxicology, Higher Institute of Agriculture, Chott-Mariem, 4042-Sousse, Tunisia.
| | - Eduardo Chicano-Gálvez
- Department of Biochemistry and Molecular Biology, University of Córdoba, Severo Ochoa Building, Rabanales Campus, Highway A4 Km 396a, 14071-Córdoba, Spain; Maimonides Institute for Research in Biomedicine of Córdoba, Reina Sofía University Hospital, University of Córdoba, 14071-Córdoba, Spain
| | - Ricardo Fernández-Cisnal
- Department of Biochemistry and Molecular Biology, University of Córdoba, Severo Ochoa Building, Rabanales Campus, Highway A4 Km 396a, 14071-Córdoba, Spain
| | - Mohamed Banni
- Laboratory of Biochemical and Environmental Toxicology, Higher Institute of Agriculture, Chott-Mariem, 4042-Sousse, Tunisia
| | - Lassaad Chouba
- Chemical Laboratory, Higher Institute of Marine Sciences and Technology, La Goulette Center, 2060 Tunis, Tunisia
| | - Hamadi Boussetta
- Laboratory of Biochemical and Environmental Toxicology, Higher Institute of Agriculture, Chott-Mariem, 4042-Sousse, Tunisia
| | - Juan López-Barea
- Department of Biochemistry and Molecular Biology, University of Córdoba, Severo Ochoa Building, Rabanales Campus, Highway A4 Km 396a, 14071-Córdoba, Spain
| | - José Alhama
- Department of Biochemistry and Molecular Biology, University of Córdoba, Severo Ochoa Building, Rabanales Campus, Highway A4 Km 396a, 14071-Córdoba, Spain
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Huang F, Wen S, Li J, Zhong Y, Zhao Y, Wu Y. The human body burden of polybrominated diphenyl ethers and their relationships with thyroid hormones in the general population in Northern China. THE SCIENCE OF THE TOTAL ENVIRONMENT 2014; 466-467:609-15. [PMID: 23959216 DOI: 10.1016/j.scitotenv.2013.07.008] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2013] [Revised: 07/01/2013] [Accepted: 07/02/2013] [Indexed: 05/02/2023]
Abstract
This study was conducted to determine the human body burden of polybrominated diphenyl ethers (PBDEs) and then clarify the relationships between that and the disruption of thyroid hormones in the general population in Northern China. Between November 2010 and May 2011, 124 serum samples were obtained from volunteers from the provinces of Shanxi and Liaoning. Serum samples were prepared by solid-phase extraction and analyzed for BDE-17, 28, 47, 66, 99, 100, 153, 154, 183 and 209 by gas chromatography-negative chemical ionization mass spectrometry. The median concentration of the total PBDEs was 7.2 ng/g lipid weights (lw); concentrations ranged from 2.1 to 160.3 ng/glw. The PBDE profiles in this study differed from those of other general populations. BDE-209 was the most abundant congener (median, 5.0 ng/glw; range, non-detected - 157.1 ng/glw), accounting for more than 75% of the total PBDEs, followed by BDE-153. The total PBDE concentrations in men were significantly higher as compared to women. The donors' age was correlated with a few PBDE congeners, but was not correlated with the total PBDE concentrations. The overall level of PBDEs in this study was lower than that observed in general populations in Southern China, Europe, and North America. There were apparent correlations between concentrations of several PBDE congeners and thyroid hormones. Triiodothyronine (T₃) was correlated with BDE-99 and 209 and inversely correlated with BDE-17, 28, 47, 153, 183, and the summed tri- to hepta-PBDE congeners (∑₃₋₇PBDEs). Thyroid-stimulating hormone (TSH) was correlated with BDE-17, 28, 47, and 183 and inversely correlated with BDE-99. No correlation between free tetraidothyronine (FT₄) and PBDEs was observed. Logistic regression analysis results indicated that those with higher levels of BDE-17 or BDE-153 had significantly lower odds of having T₃ levels above the normal range compared to those with lower levels of BDE-17 or BDE-153. Association between FT₄ and BDE-153 disappeared after controlling for sex and age. However, there was no significant association between TSH and PBDEs. The results of the present study showed that even at a relatively low level, PBDEs might interfere with the thyroid hormone levels in the general population.
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Affiliation(s)
- Feifei Huang
- Key Lab of Food Safety Risk Assessment, Ministry of Health and China Center for Food Safety Risk Assessment, 29 Nanwei Road, Beijing 100050, PR China; Suzhou Center for Disease Control and Prevention, Sanxiang Road 72, Suzhou 215004, Jiangsu Province, PR China
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Altered magnetic resonance images of brain and social behaviors of hatchling, and expression of thyroid hormone receptor βmRNA in cerebellum of embryos after Methimazole administration. Psychopharmacology (Berl) 2014; 231:221-30. [PMID: 23949207 DOI: 10.1007/s00213-013-3229-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/26/2013] [Accepted: 07/25/2013] [Indexed: 10/26/2022]
Abstract
RATIONALE AND OBJECTIVES The effects of low thyroid hormone level during embryogenesis on MRI of the brain and social behaviors of hatchlings were examined using "fertilized hen's egg-embryo-chick" system. METHODS AND RESULTS Control and hatchlings treated with methimazole (20 μmol/egg), which hatched 3 days later than controls were examined. The results are as follows: 1. The MRI examination of the midsagittal section of the brain on hatch day showed that the sizes, by T1- and ADC values by diffusion-weighted images, of the optic lobe and cerebellum of the MMI-hatchlings were significantly bigger than those of the controls. 2. The social behaviors on post-hatch day 3 were based on the following tests: (a) Aggregation test: The speed of four chicks, individually isolated by cardboard barriers in a box, to make a group upon the removal of barriers. (b) Belongingness tests: The speed of a chick isolated at a corner to join the group of three chicks placed at the opposite corner. (c) Vocalization test: The number of decibel produced by a chick isolated at a corner using a sound meter. These tests demonstrated that MMI-hatchlings took longer times and had weaker vocalization than the controls, significantly. 3. Upregulation of THRβ mRNA after MMI treatment suggested that THR was necessary for cerebellum development. CONCLUSIONS The MMI exposure during the last week of embryogenesis possibly delayed the myelination of certain brain regions and impaired the social behaviors of hatchlings. The chick embryos can be easily induced with hypothyroidism without maternal influences, and the hatchling's behaviors were analyzed using a video camera. The present method will be useful for assessing the effects of unfavorable influences during embryogenesis on social behaviors in later life.
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Zhang R, Guo J, Wu F, Mu Y, Giesy JP, Chang H, Zhao X, Feng C. Toxicity reference values for polybrominated diphenyl ethers: risk assessment for predatory birds and mammals from two Chinese lakes. REVIEWS OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2014; 229:111-137. [PMID: 24515812 DOI: 10.1007/978-3-319-03777-6_6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
PBDEs are persistent organic pollutants, and have the capability to produce adverse effects on organisms. Aquatic piscivorous species at higher trophic levels have the greatest exposure risk. Information on the toxic potency of a commercial PBDE mixture, DE-71, to mink and American kestrel was reviewed, and dietary- and tissue-based TRVs were derived and evaluated for ecological risk assessment of aquatic piscivorous species inhabiting wetland areas in China. The effect on mink thyroid function was identified as the most appropriate and protective endpoint for deriving the TRV s for mammals. The TRV was based on dietary exposure, and wa s0.1 mg DE-71/kg (wm) or 0.01 mg DE-71/kg (bm)/day (ADI); for liver of mammals,the TRV was 1.2 mg LPBDEslkg (lm). For birds, reproductive effects on American kestrels were used to derive the TRVs, in which an overall UF of 3.0 was used. The TRV was based on dietary exposure, and was 0.1 mg DE-71/kg (wm) or 0.018 mg DE-71/kg (bm)/day (ADI); for eggs of birds, the TRV was 2.35 jlgLPBDEs/g (lm). Reported concentrations of PBDEs in livers of aquatic mammals found dead, and in fish and bird eggs from Chinese wetland areas were compiled and compared to the corresponding criteria values. Results indicated that TRV values reported in this study can be used as indicators for screening-level risk assessment of piscivorous species in Chinese aquatic systems. Furthermore, based on monitoring concentrations of PBDEs in fishes from two lakes (DCL and TL) in China and the dietary-based TRV of 0.1 mg DE-71/kg (wm), a screening-level risk assessment of PBDEs was performed for predatory birds and mammals. The results suggest that concentrations of PBDEs in these two areas would not be expected to cause any adverse effects on the local fish-eating wild birds and mammals.
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Affiliation(s)
- Ruiqing Zhang
- College of Environment and Resources, Inner Mongolia University, Huhhot, 010021, Inner Mongolia, China
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Abstract
Polychlorinated biphenyls (PCBs) are persistent environmental pollutants that can severely disrupt the endocrine system. In the present study, early-weaned male rats were administered a single dose of 2,3,6-2',5'-pentachlorinated biphenyl (PCB 95; 32 mg/kg per day, by i.p. injection) for two consecutive days (postnatal days (PNDs) 15 and 16) and killed 24 and 48 h after the administration of the last dose. Compared with the control group, administration of PCB 95 induced a reduction (P<0.01) in serum concentrations of thyroxine, triiodothyronine, and GH and an increase (P<0.01) in the serum concentration of TSH at PNDs 17 and 18. These conspicuous perturbations led to some histopathological deterioration in the thyroid gland characterized by follicular degeneration, edema, fibrosis, hemorrhage, luminal obliteration, and hypertrophy with reduced colloidal contents at PND 18. The dyshormonogenesis and thyroid dysgenesis may be attributed to the elevation of DNA fragmentation at PNDs 17 and 18. Furthermore, this hypothyroid state revealed higher (P<0.01) serum concentrations of leptin, adiponectin, and tumor necrosis factor and lower (P<0.01) serum concentrations of IGF1 and insulin at both PNDs compared with the control group. Interestingly, the body weight of the neonates in the PCB 95 group exhibited severe decreases throughout the experimental period in relation to that of the control group. These results imply that PCB 95 may act as a disruptor of the developmental hypothalamic-pituitary-thyroid axis. Hypothyroidism caused by PCB 95 may impair the adipokine axis, fat metabolism, and in general postnatal development. Thus, further studies need to be carried out to understand this concept.
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Affiliation(s)
- R G Ahmed
- Division of Anatomy and Embryology, Zoology Department, Faculty of Science, Beni-Suef University, Beni-Suef, PO 62514, Egypt
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Butt CM, Stapleton HM. Inhibition of thyroid hormone sulfotransferase activity by brominated flame retardants and halogenated phenolics. Chem Res Toxicol 2013; 26:1692-702. [PMID: 24089703 DOI: 10.1021/tx400342k] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Many halogenated organic contaminants (HOCs) are considered endocrine disruptors and affect the hypothalamic-pituitary-thyroid axis, often by interfering with circulating levels of thyroid hormones (THs). We investigated one potential mechanism for TH disruption, inhibition of sulfotransferase activity. One of the primary roles of TH sulfation is to support the regulation of biologically active T3 through the formation of inactive THs. We investigated TH sulfotransferase inhibition by 14 hydroxylated polybrominated diphenyl ethers (OH BDEs), BDE 47, triclosan, and fluorinated, chlorinated, brominated, and iodinated analogues of 2,4,6-trihalogenated phenol and bisphenol A (BPA). A new mass spectrometry-based method was also developed to measure the formation rates of 3,3'-T2 sulfate (3,3'-T2S). Using pooled human liver cytosol, we investigated the influence of these HOCs on the sulfation of 3,3'-T2, a major substrate for TH sulfation. For the formation of 3,3'-T2S, the Michaelis constant (Km) was 1070 ± 120 nM and the Vmax was 153 ± 6.6 pmol min(-1) (mg of protein)(-1). All chemicals investigated inhibited sulfotransferase activity with the exception of BDE 47. The 2,4,6-trihalogenated phenols were the most potent inhibitors followed by the OH BDEs and then halogenated BPAs. The IC50 values for the OH BDEs were primarily in the low nanomolar range, which may be environmentally relevant. In silico molecular modeling techniques were also used to simulate the binding of OH BDE to SULT1A1. This study suggests that some HOCs, including antimicrobial chemicals and metabolites of flame retardants, may interfere with TH regulation through inhibition of sulfotransferase activity.
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Affiliation(s)
- Craig M Butt
- Nicholas School of the Environment, Duke University , Durham, North Carolina 27708, United States
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Jain RB. Association between thyroid profile and perfluoroalkyl acids: data from NHNAES 2007-2008. ENVIRONMENTAL RESEARCH 2013; 126:51-9. [PMID: 24053974 DOI: 10.1016/j.envres.2013.08.006] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2013] [Revised: 04/20/2013] [Accepted: 08/19/2013] [Indexed: 05/05/2023]
Abstract
The effect of six perfluoroalkyl acids (PFAAs), namely, perfluorooctane sulfonate (PFOS), perfluorooctanoic acid (PFOA), perfluorodecanoic acid (PFDE), perfluorohexane sulfonic acid (PFHxS), 2-(N-methyl-perfluorooctane sulfonamide) acetic acid (MPAH), and perfluorononanoic acid (PFNA) on the levels of six thyroid function variables, namely, thyroid stimulating hormone (TSH), free and total thyroxine (FT4, TT4), free and total triiodothyronine (FT3, TT3), and thyroglobulin (TGN) was evaluated. Data from National Health and Nutrition Examination Survey for the years 2007-2008 were used for this evaluation. TSH levels increased with increase in levels of PFOA (p<0.01). There were no statistically significant associations between the levels of FT3, and FT4 with the levels of any of the six PFAAs. Levels of TT3 were found to increase with the levels of PFOA (p=0.01) and TT4 levels were found to increase with increase in PFHxS levels (p<0.01). Males had statistically significantly higher levels of FT3 than females and females had statistically significantly higher levels of TT4 than males. As compared to non-Hispanics whites and Hispanics, non-Hispanic blacks had lower levels of TSH, FT3, TT3, and TT4 but Hispanics had the lowest levels of TGN. Age was negatively associated with FT3 and TT3 but positively associated with FT4 and TT4. Non-smokers had higher levels of TSH and TT4 than smokers and smokers had higher levels of FT3 and TGN than non-smokers. Iodine deficiency was associated with increased levels of TSH, TT3, TT4, and TGN.
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Affiliation(s)
- Ram B Jain
- 1061 Albemarle Way, Lawrenceville, GA 30044, United States.
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Esser A, Gube M, Schettgen T, Kraus T, Lang J. QALY as evaluation tool in a health surveillance program. Int J Hyg Environ Health 2013; 217:399-404. [PMID: 24054544 DOI: 10.1016/j.ijheh.2013.07.014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2012] [Revised: 07/17/2013] [Accepted: 07/29/2013] [Indexed: 10/26/2022]
Abstract
BACKGROUND Quality adjusted life years (QALYs), based on health related quality of life (HRQL), are a commonly used concept in health economics. The aim of this study was to apply the concept of QALY to the evaluation of a surveillance program for health related effects of PCB exposure and measure the impact of occupational PCB-exposure on the remaining QALYs of participants. METHODS The internal PCB exposure was determined by gas chromatography with mass spectrometry in plasma. The HRQOL was assessed via the EQ-5D-3L instrument and combined with the remaining lifetime (RLE) at the time point of cessation of exposure. For comparative reasons we used both the linear calculation and the complex-number-model from Prieto and Sacristan. The impact of several PCB congeners was regressed on the percentage of discounted QALYs on RLE via hierarchical multiple regression, controlling for gender, relational and educational status. RESULTS Findings were able to detect a small but significant effect of elevated plasma levels of PCB on QALY for the linear calculation and partially for the complex number calculation. This means that an internal exposure to PCB reduced HRQOL in the RLE of participants in the surveillance program. CONCLUSION QALYs can be applied successfully to monitor HRQL effects in surveillance programs. The exposure to a hazardous substance has an influence on QALYs. Findings have to be interpreted as a first hint. In the following assessment it has to be monitored whether there is an improvement or worsening of HRQL.
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Affiliation(s)
- André Esser
- Institute for Occupational Medicine and Social Medicine, RWTH Aachen University, Aachen, Germany(1).
| | - Monika Gube
- Institute for Occupational Medicine and Social Medicine, RWTH Aachen University, Aachen, Germany(1)
| | - Thomas Schettgen
- Institute for Occupational Medicine and Social Medicine, RWTH Aachen University, Aachen, Germany(1)
| | - Thomas Kraus
- Institute for Occupational Medicine and Social Medicine, RWTH Aachen University, Aachen, Germany(1)
| | - Jessica Lang
- Institute for Occupational Medicine and Social Medicine, RWTH Aachen University, Aachen, Germany(1)
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Latchney SE, Hein AM, O'Banion MK, DiCicco-Bloom E, Opanashuk LA. Deletion or activation of the aryl hydrocarbon receptor alters adult hippocampal neurogenesis and contextual fear memory. J Neurochem 2013; 125:430-45. [PMID: 23240617 DOI: 10.1111/jnc.12130] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2012] [Revised: 11/07/2012] [Accepted: 12/13/2012] [Indexed: 12/24/2022]
Abstract
The aryl hydrocarbon receptor (AhR) is a ligand-activated transcription factor that mediates the toxicity of dioxin and serves multiple developmental roles. In the adult brain, while we now localize AhR mRNA to nestin-expressing neural progenitor cells in the dentate gyrus (DG) of the hippocampus, its function is unknown. This study tested the hypothesis that AhR participates in hippocampal neurogenesis and associated functions. AhR deletion and activation by the potent environmental toxicant, 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), adversely impacted neurogenesis and cognition. Adult AhR-deficient mice exhibited impaired hippocampal-dependent contextual fear memory while hippocampal-independent memory remained intact. AhR-deficient mice displayed reduced cell birth, decreased cell survival, and diminished neuronal differentiation in the DG. Following TCDD exposure, wild-type mice exhibited impaired hippocampal-dependent contextual memory, decreased cell birth, reduced neuronal differentiation, and fewer mature neurons in the DG. Glial differentiation and apoptosis were not altered in either TCDD-exposed or AhR-deficient mice. Finally, defects observed in TCDD-exposed mice were dependent on AhR, as TCDD had no negative effects in AhR-deficient mice. Our findings suggest that AhR should be further evaluated as a potential transcriptional regulator of hippocampal neurogenesis and function, although other sites of action may also warrant consideration. Moreover, TCDD exposure should be considered as an environmental risk factor that disrupts adult neurogenesis and potentially related memory processes.
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Affiliation(s)
- Sarah E Latchney
- Department of Environmental Medicine, University of Rochester School of Medicine and Dentistry, Rochester, New York 14642, USA
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Dietrich JW, Landgrafe G, Fotiadou EH. TSH and Thyrotropic Agonists: Key Actors in Thyroid Homeostasis. J Thyroid Res 2012; 2012:351864. [PMID: 23365787 PMCID: PMC3544290 DOI: 10.1155/2012/351864] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/08/2012] [Accepted: 11/21/2012] [Indexed: 12/11/2022] Open
Abstract
This paper provides the reader with an overview of our current knowledge of hypothalamic-pituitary-thyroid feedback from a cybernetic standpoint. Over the past decades we have gained a plethora of information from biochemical, clinical, and epidemiological investigation, especially on the role of TSH and other thyrotropic agonists as critical components of this complex relationship. Integrating these data into a systems perspective delivers new insights into static and dynamic behaviour of thyroid homeostasis. Explicit usage of this information with mathematical methods promises to deliver a better understanding of thyrotropic feedback control and new options for personalised diagnosis of thyroid dysfunction and targeted therapy, also by permitting a new perspective on the conundrum of the TSH reference range.
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Affiliation(s)
- Johannes W. Dietrich
- Lab XU44, Medical Hospital I, Bergmannsheil University Hospitals, Ruhr University of Bochum (UK RUB), Bürkle-de-la-Camp-Platz 1, 44789 Bochum, NRW, Germany
| | - Gabi Landgrafe
- Lab XU44, Medical Hospital I, Bergmannsheil University Hospitals, Ruhr University of Bochum (UK RUB), Bürkle-de-la-Camp-Platz 1, 44789 Bochum, NRW, Germany
- Klinik für Allgemein- und Visceralchirurgie, Agaplesion Bethesda Krankenhaus Wuppertal gGmbH, Hainstraße 35, 42109 Wuppertal, NRW, Germany
| | - Elisavet H. Fotiadou
- Lab XU44, Medical Hospital I, Bergmannsheil University Hospitals, Ruhr University of Bochum (UK RUB), Bürkle-de-la-Camp-Platz 1, 44789 Bochum, NRW, Germany
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50
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Wens B, De Boever P, Verbeke M, Hollanders K, Schoeters G. Cultured human peripheral blood mononuclear cells alter their gene expression when challenged with endocrine-disrupting chemicals. Toxicology 2012; 303:17-24. [PMID: 23146750 DOI: 10.1016/j.tox.2012.10.019] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2012] [Accepted: 10/07/2012] [Indexed: 12/11/2022]
Abstract
Endocrine disrupting chemicals (EDCs) have the potential to interfere with the hormonal system and may negatively influence human health. Microarray analysis was used in this study to investigate differential gene expression in human peripheral blood cells (PBMCs) after in vitro exposure to EDCs. PBMCs, isolated from blood samples of four male and four female healthy individuals, were exposed in vitro for 18h to either a dioxin-like polychlorinated biphenyl (PCB126, 1μM), a non-dioxin-like polychlorinated biphenyl (PCB153, 10μM), a brominated flame retardant (BDE47, 10μM), a perfluorinated alkyl acid (PFOA, 10μM) or bisphenol (BPA, 10μM). ANOVA analysis revealed a significant change in the expression of 862 genes as a result of EDC exposure. The gender of the donors did not affect gene expression. Hierarchical cluster analysis created three groups and clustered: (1) PCB126-exposed samples, (2) PCB153 and BDE47, (3) PFOA and BPA. The number of differentially expressed genes varied per compound and ranged from 60 to 192 when using fold change and multiplicity corrected p-value as filtering criteria. Exposure to PCB126 induced the AhR signaling pathway. BDE47 and PCB153 are known to disrupt thyroid metabolism and exposure influenced the expression of the nuclear receptors PPARγ and ESR2, respectively. BPA and PFOA did not induce significant changes in the expression of known nuclear receptors. Overall, each compound produced a unique gene expression signature affecting pathways and GO processes linked to metabolism and inflammation. Twenty-nine genes were significantly altered in expression under all experimental conditions. Six of these genes (HSD11B2, MMP11, ADIPOQ, CEL, DUSP9 and TUB) could be associated with obesity and metabolic syndrome. In conclusion, microarray analysis identified that PBMCs altered their gene expression response in vitro when challenged with EDCs. Our screening approach has identified a number of gene candidates that warrant further study.
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Affiliation(s)
- B Wens
- Flemish Institute for Technological Research (VITO), Unit Environmental Risk and Health, Mol, Belgium
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