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Wilson RJ, Suh YP, Dursun I, Li X, da Costa Souza F, Grodzki AC, Cui JY, Lehmler HJ, Lein PJ. Developmental exposure to the Fox River PCB mixture modulates behavior in juvenile mice. Neurotoxicology 2024; 103:146-161. [PMID: 38885884 DOI: 10.1016/j.neuro.2024.06.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2024] [Revised: 05/13/2024] [Accepted: 06/11/2024] [Indexed: 06/20/2024]
Abstract
Developmental exposures to PCBs are implicated in the etiology of neurodevelopmental disorders (NDDs). This observation is concerning given the continued presence of PCBs in the human environment and the increasing incidence of NDDs. Previous studies reported that developmental exposure to legacy commercial PCB mixtures (Aroclors) or single PCB congeners found in Aroclors caused NDD-relevant behavioral phenotypes in animal models. However, the PCB congener profile in contemporary human samples is dissimilar to that of the legacy Aroclors, raising the question of whether human-relevant PCB mixtures similarly interfere with normal brain development. To address this question, we assessed the developmental neurotoxicity of the Fox River Mixture (FRM), which was designed to mimic the congener profile identified in fish from the PCB-contaminated Fox River that constitute a primary protein source in the diet of surrounding communities. Adult female C57BL/6 J mouse dams (8-10 weeks old) were exposed to vehicle (peanut oil) or FRM at 0.1, 1.0, or 6.0 mg/kg/d in their diet throughout gestation and lactation, and neurodevelopmental outcomes were assessed in their pups. Ultrasonic vocalizations (USVs) and measures of general development were quantified at postnatal day (P) 7, while performance in the spontaneous alternation task and the 3-chambered social approach/social novelty task was assessed on P35. Triiodothyronine (T3) and thyroxine (T4) were quantified in serum collected from the dams when pups were weaned and from pups on P28 and P35. Developmental exposure to FRM did not alter pup weight or body temperature on P7, but USVs were significantly decreased in litters exposed to FRM at 0.1 or 6.0 mg/kg/d in the maternal diet. FRM also impaired male and female pups' performance in the social novelty task. Compared to sex-matched vehicles, significantly decreased social novelty was observed in male and female pups in the 0.1 and 6.0 mg/kg/d dose groups. FRM did not alter performance in the spontaneous alternation or social approach tasks. FRM increased serum T3 levels but decreased serum T4 levels in P28 male pups in the 1.0 and 6.0 mg/kg/d dose groups. In P35 female pups and dams, serum T3 levels decreased in the 6.0 mg/kg/d dose group while T4 levels were not altered. Collectively, these findings suggest that FRM interferes with the development of social communication and social novelty, but not memory, supporting the hypothesis that contemporary PCB exposures pose a risk to the developing brain. FRM had sex, age, and dose-dependent effects on serum thyroid hormone levels that overlapped but did not perfectly align with the FRM effects on behavioral outcomes. These observations suggest that changes in thyroid hormone levels are not likely the major factor underlying the behavioral deficits observed in FRM-exposed animals.
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Affiliation(s)
- Rebecca J Wilson
- Department of Molecular Biosciences, University of California Davis, Davis, CA, USA
| | - Youjun P Suh
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, USA
| | - Ilknur Dursun
- Department of Molecular Biosciences, University of California Davis, Davis, CA, USA; Istinye University, School of Medicine, Department of Physiology, Istanbul 34396, Turkey
| | - Xueshu Li
- Department of Occupational and Environmental Health, University of Iowa, Iowa City, IA, USA
| | | | - Ana Cristina Grodzki
- Department of Molecular Biosciences, University of California Davis, Davis, CA, USA
| | - Julia Y Cui
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, USA
| | - Hans-Joachim Lehmler
- Department of Occupational and Environmental Health, University of Iowa, Iowa City, IA, USA
| | - Pamela J Lein
- Department of Molecular Biosciences, University of California Davis, Davis, CA, USA.
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2
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Bottini CLJ, MacDougall-Shackleton SA. Methylmercury effects on avian brains. Neurotoxicology 2023; 96:140-153. [PMID: 37059311 DOI: 10.1016/j.neuro.2023.04.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2023] [Revised: 04/03/2023] [Accepted: 04/11/2023] [Indexed: 04/16/2023]
Abstract
Methylmercury (MeHg) is a concerning contaminant due to its ubiquity and harmful effects on organisms. Although birds are important models in the neurobiology of vocal learning and adult neuroplasticity, the neurotoxic effects of MeHg are less understood in birds than mammals. We surveyed the literature on MeHg effects on biochemical changes in the avian brain. Publication rates of papers related to neurology and/or birds and/or MeHg increased with time and can be linked with historical events, regulations, and increased understanding of MeHg cycling in the environment. However, publications on MeHg effects on the avian brain remain relatively low across time. The neural effects measured to evaluate MeHg neurotoxicity in birds changed with time and researcher interest. The measures most consistently affected by MeHg exposure in birds were markers of oxidative stress. NMDA, acetylcholinesterase, and Purkinje cells also seem sensitive to some extent. MeHg exposure has the potential to affect most neurotransmitter systems but more studies are needed for validation in birds. We also review the main mechanisms of MeHg-induced neurotoxicity in mammals and compare it to what is known in birds. The literature on MeHg effects on the avian brain is limited, preventing full construction of an adverse outcome pathway. We identify research gaps for taxonomic groups such as songbirds, and age- and life-stage groups such as immature fledgling stage and adult non-reproductive life stage. In addition, results are often inconsistent between experimental and field studies. We conclude that future neurotoxicological studies of MeHg impacts on birds need to better connect the numerous aspects of exposure from molecular physiological effects to behavioural outcomes that would be ecologically or biologically relevant for birds, especially under challenging conditions.
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Affiliation(s)
- Claire L J Bottini
- University of Western Ontario, Department of Biology, 1151 Richmond St., London Ontario, N6A 5B7; Advanced Facility for Avian Research, University of Western Ontario, London, Ontario, Canada.
| | - Scott A MacDougall-Shackleton
- Advanced Facility for Avian Research, University of Western Ontario, London, Ontario, Canada; University of Western Ontario, Department of Psychology, 1151 Richmond St., London Ontario, N6A 5C2
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3
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Zhang D, Saktrakulkla P, Marek RF, Lehmler HJ, Wang K, Thorne PS, Hornbuckle KC, Duffel MW. PCB Sulfates in Serum from Mothers and Children in Urban and Rural U.S. Communities. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:6537-6547. [PMID: 35500099 PMCID: PMC9118556 DOI: 10.1021/acs.est.2c00223] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Revised: 04/05/2022] [Accepted: 04/17/2022] [Indexed: 06/14/2023]
Abstract
Serum samples from 24 subjects (6 mother-daughter and 6 mother-son dyads) in a rural community (Columbus Junction, Iowa) and 24 subjects (6 mother-daughter and 6 mother-son dyads) in an urban community (East Chicago, Indiana) were analyzed for 74 sulfated metabolites of polychlorinated biphenyls (PCBs). We detected significantly higher mean concentrations of total assessed PCB sulfates in the urban group (110-8900 ng/g fresh weight of serum, mean = 3400 ng/g, standard error = 300) than in the rural cohort (530-6700 ng/g fresh weight of serum, mean = 1800 ng/g, standard error = 500). Eight PCB sulfate congeners (4-PCB 2 sulfate, 4'-PCB 2 sulfate, 2'-PCB 3 sulfate, 4'-PCB 3 sulfate, 4-PCB 11 sulfate, 4'-PCB 18 sulfate, 4'-PCB 25 sulfate, and 4-PCB 52 sulfate) contributed over 90% of the total assessed PCB sulfates in most individuals. The serum samples were enriched in PCB sulfates with fewer than 5 chlorine atoms, and this congener distribution differed from those of PCBs and hydroxylated PCBs in previous studies in the same communities. Regression analysis indicated several significant congener-specific correlations in mother-child dyads, and these relationships differed by location and by mother-daughter or mother-son dyads. This is the first study reporting a broad range of PCB sulfates in populations from urban and rural areas.
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Affiliation(s)
- Duo Zhang
- Interdisciplinary
Graduate Program in Human Toxicology, The
University of Iowa, Iowa City, Iowa 52242 United States
- Department
of Pharmaceutical Sciences & Experimental Therapeutics, The University of Iowa, Iowa City, Iowa 52242, United States
| | - Panithi Saktrakulkla
- Interdisciplinary
Graduate Program in Human Toxicology, The
University of Iowa, Iowa City, Iowa 52242 United States
- Department
of Civil and Environmental Engineering, The University of Iowa, Iowa City, Iowa 52242 United States
| | - Rachel F. Marek
- Department
of Civil and Environmental Engineering, The University of Iowa, Iowa City, Iowa 52242 United States
- IIHR-Hydroscience
& Engineering, The University of Iowa, Iowa City, Iowa 52242, United States
| | - Hans-Joachim Lehmler
- Interdisciplinary
Graduate Program in Human Toxicology, The
University of Iowa, Iowa City, Iowa 52242 United States
- Department
of Occupational and Environmental Health, The University of Iowa, Iowa City, Iowa 52242, United States
| | - Kai Wang
- Department
of Biostatistics, The University of Iowa, Iowa City, Iowa 52242 United States
| | - Peter S. Thorne
- Interdisciplinary
Graduate Program in Human Toxicology, The
University of Iowa, Iowa City, Iowa 52242 United States
- Department
of Occupational and Environmental Health, The University of Iowa, Iowa City, Iowa 52242, United States
| | - Keri C. Hornbuckle
- Interdisciplinary
Graduate Program in Human Toxicology, The
University of Iowa, Iowa City, Iowa 52242 United States
- Department
of Civil and Environmental Engineering, The University of Iowa, Iowa City, Iowa 52242 United States
- IIHR-Hydroscience
& Engineering, The University of Iowa, Iowa City, Iowa 52242, United States
| | - Michael W. Duffel
- Interdisciplinary
Graduate Program in Human Toxicology, The
University of Iowa, Iowa City, Iowa 52242 United States
- Department
of Pharmaceutical Sciences & Experimental Therapeutics, The University of Iowa, Iowa City, Iowa 52242, United States
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Manto MU. Cerebellotoxic Agents. HANDBOOK OF THE CEREBELLUM AND CEREBELLAR DISORDERS 2022:2363-2408. [DOI: 10.1007/978-3-030-23810-0_96] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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Methylmercury induces neuronal cell death by inducing TNF-α expression through the ASK1/p38 signaling pathway in microglia. Sci Rep 2021; 11:9832. [PMID: 33972601 PMCID: PMC8110582 DOI: 10.1038/s41598-021-89210-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Accepted: 03/15/2021] [Indexed: 02/08/2023] Open
Abstract
We recently found that tumor necrosis factor-α (TNF-α) may be involved in neuronal cell death induced by methylmercury in the mouse brain. Here, we examined the cells involved in the induction of TNF-α expression by methylmercury in the mouse brain by in situ hybridization. TNF-α-expressing cells were found throughout the brain and were identified as microglia by immunostaining for ionized calcium binding adaptor molecule 1 (Iba1). Methylmercury induced TNF-α expression in mouse primary microglia and mouse microglial cell line BV2. Knockdown of apoptosis signal-regulating kinase 1 (ASK1), an inflammatory cytokine up-regulator that is responsible for reactive oxygen species (ROS), decreased methylmercury-induced TNF-α expression through decreased phosphorylation of p38 MAP kinase in BV2 cells. Suppression of methylmercury-induced reactive oxygen species (ROS) by antioxidant treatment largely abolished the induction of TNF-α expression and phosphorylation of p38 by methylmercury in BV2 cells. Finally, in mouse brain slices, the TNF-α antagonist (WP9QY) inhibited neuronal cell death induced by methylmercury, as did the p38 inhibitor SB203580 and liposomal clodronate (a microglia-depleting agent). These results indicate that methylmercury induces mitochondrial ROS that are involved in activation of the ASK1/p38 pathway in microglia and that this is associated with induction of TNF-α expression and neuronal cell death.
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Maurice C, Dalvai M, Lambrot R, Deschênes A, Scott-Boyer MP, McGraw S, Chan D, Côté N, Ziv-Gal A, Flaws JA, Droit A, Trasler J, Kimmins S, Bailey JL. Early-Life Exposure to Environmental Contaminants Perturbs the Sperm Epigenome and Induces Negative Pregnancy Outcomes for Three Generations via the Paternal Lineage. EPIGENOMES 2021; 5:epigenomes5020010. [PMID: 34968297 PMCID: PMC8594730 DOI: 10.3390/epigenomes5020010] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Accepted: 04/27/2021] [Indexed: 12/13/2022] Open
Abstract
Due to the grasshopper effect, the Arctic food chain in Canada is contaminated with persistent organic pollutants (POPs) of industrial origin, including polychlorinated biphenyls and organochlorine pesticides. Exposure to POPs may be a contributor to the greater incidence of poor fetal growth, placental abnormalities, stillbirths, congenital defects and shortened lifespan in the Inuit population compared to non-Aboriginal Canadians. Although maternal exposure to POPs is well established to harm pregnancy outcomes, paternal transmission of the effects of POPs is a possibility that has not been well investigated. We used a rat model to test the hypothesis that exposure to POPs during gestation and suckling leads to developmental defects that are transmitted to subsequent generations via the male lineage. Indeed, developmental exposure to an environmentally relevant Arctic POPs mixture impaired sperm quality and pregnancy outcomes across two subsequent, unexposed generations and altered sperm DNA methylation, some of which are also observed for two additional generations. Genes corresponding to the altered sperm methylome correspond to health problems encountered in the Inuit population. These findings demonstrate that the paternal methylome is sensitive to the environment and that some perturbations persist for at least two subsequent generations. In conclusion, although many factors influence health, paternal exposure to contaminants plays a heretofore-underappreciated role with sperm DNA methylation contributing to the molecular underpinnings involved.
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Affiliation(s)
- Clotilde Maurice
- Research Centre on Reproduction and Intergenerational Health, Department of Animal Sciences, Université Laval, Quebec City, QC G1V 0A6, Canada; (C.M.); (M.D.)
| | - Mathieu Dalvai
- Research Centre on Reproduction and Intergenerational Health, Department of Animal Sciences, Université Laval, Quebec City, QC G1V 0A6, Canada; (C.M.); (M.D.)
| | - Romain Lambrot
- Department of Animal Sciences, McGill University, Ste. Anne de Bellevue, Quebec, QC H9X 3V9, Canada; (R.L.); (S.K.)
- Department of Pharmacology and Therapeutics, McGill University, Montreal, QC H3G 1Y6, Canada
| | - Astrid Deschênes
- Department of Molecular Medicine, Research Center of CHU of Quebec City, Université Laval, Quebec City, QC G1V 4G, Canada; (A.D.); (M.-P.S.-B.); (A.D.)
| | - Marie-Pier Scott-Boyer
- Department of Molecular Medicine, Research Center of CHU of Quebec City, Université Laval, Quebec City, QC G1V 4G, Canada; (A.D.); (M.-P.S.-B.); (A.D.)
| | - Serge McGraw
- Research Center of CHU Sainte-Justine, Department of Biochemistry and Molecular Medicine, Université de Montral, Montreal, QC H3T 1C5, Canada;
| | - Donovan Chan
- Research Institute of the McGill University Health Centre, Montreal, QC H3Z 2Z3, Canada; (D.C.); (J.T.)
- Departments of Pediatrics, Human Genetics and Pharmacology & Therapeutics, McGill University, Montreal, QC H3Z 2Z3, Canada
| | - Nancy Côté
- Institut Universitaire de Cardiologie et de Pneumologie de Québec, Université Laval, Quebec City, QC G1V 4G5, Canada;
| | - Ayelet Ziv-Gal
- Department of Comparative Biosciences, University of Illinois, Urbana-Champaign, IL 61802, USA; (A.Z.-G.); (J.A.F.)
| | - Jodi A. Flaws
- Department of Comparative Biosciences, University of Illinois, Urbana-Champaign, IL 61802, USA; (A.Z.-G.); (J.A.F.)
| | - Arnaud Droit
- Department of Molecular Medicine, Research Center of CHU of Quebec City, Université Laval, Quebec City, QC G1V 4G, Canada; (A.D.); (M.-P.S.-B.); (A.D.)
| | - Jacquetta Trasler
- Research Institute of the McGill University Health Centre, Montreal, QC H3Z 2Z3, Canada; (D.C.); (J.T.)
- Departments of Pediatrics, Human Genetics and Pharmacology & Therapeutics, McGill University, Montreal, QC H3Z 2Z3, Canada
| | - Sarah Kimmins
- Department of Animal Sciences, McGill University, Ste. Anne de Bellevue, Quebec, QC H9X 3V9, Canada; (R.L.); (S.K.)
- Department of Pharmacology and Therapeutics, McGill University, Montreal, QC H3G 1Y6, Canada
| | - Janice L. Bailey
- Research Centre on Reproduction and Intergenerational Health, Department of Animal Sciences, Université Laval, Quebec City, QC G1V 0A6, Canada; (C.M.); (M.D.)
- Correspondence: ; Tel.: +1-418-643-3230
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7
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Manto MU. Cerebellotoxic Agents. HANDBOOK OF THE CEREBELLUM AND CEREBELLAR DISORDERS 2021:1-46. [DOI: 10.1007/978-3-319-97911-3_96-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Accepted: 12/15/2020] [Indexed: 09/02/2023]
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8
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Peppriell AE, Gunderson JT, Vorojeikina D, Rand MD. Methylmercury myotoxicity targets formation of the myotendinous junction. Toxicology 2020; 443:152561. [PMID: 32800841 PMCID: PMC7530093 DOI: 10.1016/j.tox.2020.152561] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Revised: 07/24/2020] [Accepted: 08/09/2020] [Indexed: 12/12/2022]
Abstract
Methylmercury (MeHg) is a ubiquitous environmental contaminant and developmental toxicant known to cause a variety of persistent motor and cognitive deficits. While previous research has focused predominantly on neurotoxic MeHg effects, emerging evidence points to a myotoxic role whereby MeHg induces defects in muscle development and maintenance. A genome wide association study for developmental sensitivity to MeHg in Drosophila has revealed several conserved muscle morphogenesis candidate genes that function in an array of processes from myoblast migration and fusion to myotendinous junction (MTJ) formation and myofibrillogenesis. Here, we investigated candidates for a role in mediating MeHg disruption of muscle development by evaluating morphological and functional phenotypes of the indirect flight muscles (IFMs) in pupal and adult flies following 0, 5, 10, and 15 μM MeHg exposure via feeding at the larval stage. Developmental MeHg exposure induced a dose-dependent increase in muscle detachments (myospheres) within dorsal bundles of the IFMs, which paralleled reductions eclosion and adult flight behaviors. These effects were selectively phenocopied by altered expression of kon-tiki (kon), a chondroitin sulfate proteoglycan 4/NG2 homologue and a central component of MTJ formation. MeHg elevated kon transcript expression at a crucial window of IFM development and transgene overexpression of kon could also phenocopy myosphere phenotypes and eclosion and flight deficits. Finally, the myosphere phenotype resulting from 10 μM MeHg was partially rescued in a background of reduced kon expression using a targeted RNAi approach. Our findings implicate a component of the MTJ as a MeHg toxicity target which broaden the understanding of how motor deficits can emerge from early life MeHg exposure.
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Affiliation(s)
- Ashley E Peppriell
- Department of Environmental Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY, United States
| | - Jakob T Gunderson
- Department of Environmental Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY, United States
| | - Daria Vorojeikina
- Department of Environmental Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY, United States
| | - Matthew D Rand
- Department of Environmental Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY, United States.
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9
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Klocke C, Lein PJ. Evidence Implicating Non-Dioxin-Like Congeners as the Key Mediators of Polychlorinated Biphenyl (PCB) Developmental Neurotoxicity. Int J Mol Sci 2020; 21:E1013. [PMID: 32033061 PMCID: PMC7037228 DOI: 10.3390/ijms21031013] [Citation(s) in RCA: 64] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2020] [Revised: 01/31/2020] [Accepted: 02/02/2020] [Indexed: 12/15/2022] Open
Abstract
Despite being banned from production for decades, polychlorinated biphenyls (PCBs) continue to pose a significant risk to human health. This is due to not only the continued release of legacy PCBs from PCB-containing equipment and materials manufactured prior to the ban on PCB production, but also the inadvertent production of PCBs as byproducts of contemporary pigment and dye production. Evidence from human and animal studies clearly identifies developmental neurotoxicity as a primary endpoint of concern associated with PCB exposures. However, the relative role(s) of specific PCB congeners in mediating the adverse effects of PCBs on the developing nervous system, and the mechanism(s) by which PCBs disrupt typical neurodevelopment remain outstanding questions. New questions are also emerging regarding the potential developmental neurotoxicity of lower chlorinated PCBs that were not present in the legacy commercial PCB mixtures, but constitute a significant proportion of contemporary human PCB exposures. Here, we review behavioral and mechanistic data obtained from experimental models as well as recent epidemiological studies that suggest the non-dioxin-like (NDL) PCBs are primarily responsible for the developmental neurotoxicity associated with PCBs. We also discuss emerging data demonstrating the potential for non-legacy, lower chlorinated PCBs to cause adverse neurodevelopmental outcomes. Molecular targets, the relevance of PCB interactions with these targets to neurodevelopmental disorders, and critical data gaps are addressed as well.
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Affiliation(s)
| | - Pamela J. Lein
- Department of Molecular Biosciences, University of California, Davis, School of Veterinary Medicine, Davis, CA 95616, USA;
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10
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Colter BT, Garber HF, Fleming SM, Fowler JP, Harding GD, Hooven MK, Howes AA, Infante SK, Lang AL, MacDougall MC, Stegman M, Taylor KR, Curran CP. Ahr and Cyp1a2 genotypes both affect susceptibility to motor deficits following gestational and lactational exposure to polychlorinated biphenyls. Neurotoxicology 2019; 65:125-134. [PMID: 29409959 DOI: 10.1016/j.neuro.2018.01.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2017] [Revised: 01/16/2018] [Accepted: 01/21/2018] [Indexed: 02/04/2023]
Abstract
Polychlorinated biphenyls (PCBs) are persistent organic pollutants known to cause adverse health effects and linked to neurological deficits in both human and animal studies. Children born to exposed mothers are at highest risk of learning and memory and motor deficits. We developed a mouse model that mimics human variation in the aryl hydrocarbon receptor and cytochrome P450 1A2 (CYP1A2) to determine if genetic variation increases susceptibility to developmental PCB exposure. In our previous studies, we found that high-affinity AhrbCyp1a2(-/-) and poor-affinity AhrdCyp1a2(-/-) knockout mice were most susceptible to learning and memory deficits following developmental PCB exposure compared with AhrbCyp1a2(+/+) wild type mice (C57BL/6J strain). Our follow-up studies focused on motor deficits, because human studies have identified PCBs as a potential risk factor for Parkinson's disease. Dams were treated with an environmentally relevant PCB mixture at gestational day 10 and postnatal day 5. We used a motor battery that included tests of nigrostriatal function as well as cerebellar function, because PCBs deplete thyroid hormone, which is essential to normal cerebellar development. There was a significant effect of PCB treatment in the rotarod test with impaired performance in all three genotypes, but decreased motor learning as well in the two Cyp1a2(-/-) knockout lines. Interestingly, we found a main effect of genotype with corn oil-treated control Cyp1a2(-/-) mice performing significantly worse than Cyp1a2(+/+) wild type mice. In contrast, we found that PCB-treated high-affinity Ahrb mice were most susceptible to disruption of nigrostriatal function with the greatest deficits in AhrbCyp1a2(-/-) mice. We conclude that differences in AHR affinity combined with the absence of CYP1A2 protein affect susceptibility to motor deficits following developmental PCB exposure.
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Affiliation(s)
- Breann T Colter
- Department of Biological Sciences, Northern Kentucky University, Highland Heights, KY, 41076, USA
| | - Helen Frances Garber
- Department of Biological Sciences, Northern Kentucky University, Highland Heights, KY, 41076, USA
| | - Sheila M Fleming
- Department of Psychology and Neurology, University of Cincinnati, Cincinnati, OH, 45267, USA
| | - Jocelyn Phillips Fowler
- Department of Biological Sciences, Northern Kentucky University, Highland Heights, KY, 41076, USA
| | - Gregory D Harding
- Department of Biological Sciences, Northern Kentucky University, Highland Heights, KY, 41076, USA
| | - Molly Kromme Hooven
- Department of Biological Sciences, Northern Kentucky University, Highland Heights, KY, 41076, USA
| | - Amy Ashworth Howes
- Department of Biological Sciences, Northern Kentucky University, Highland Heights, KY, 41076, USA
| | - Smitha Krishnan Infante
- Department of Biological Sciences, Northern Kentucky University, Highland Heights, KY, 41076, USA
| | - Anna L Lang
- Department of Biological Sciences, Northern Kentucky University, Highland Heights, KY, 41076, USA
| | | | - Melinda Stegman
- Department of Biological Sciences, Northern Kentucky University, Highland Heights, KY, 41076, USA
| | - Kelsey Rae Taylor
- Department of Biological Sciences, Northern Kentucky University, Highland Heights, KY, 41076, USA
| | - Christine Perdan Curran
- Department of Biological Sciences, Northern Kentucky University, Highland Heights, KY, 41076, USA.
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11
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Prince LM, Aschner M, Bowman AB. Human-induced pluripotent stems cells as a model to dissect the selective neurotoxicity of methylmercury. Biochim Biophys Acta Gen Subj 2019; 1863:129300. [PMID: 30742955 DOI: 10.1016/j.bbagen.2019.02.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Revised: 01/09/2019] [Accepted: 02/01/2019] [Indexed: 01/07/2023]
Abstract
Methylmercury (MeHg) is a potent neurotoxicant affecting both the developing and mature central nervous system (CNS) with apparent indiscriminate disruption of multiple homeostatic pathways. However, genetic and environmental modifiers contribute significant variability to neurotoxicity associated with human exposures. MeHg displays developmental stage and neural lineage selective neurotoxicity. To identify mechanistic-based neuroprotective strategies to mitigate human MeHg exposure risk, it will be critical to improve our understanding of the basis of MeHg neurotoxicity and of this selective neurotoxicity. Here, we propose that human-based pluripotent stem cell cellular approaches may enable mechanistic insight into genetic pathways that modify sensitivity of specific neural lineages to MeHg-induced neurotoxicity. Such studies are crucial for the development of novel disease modifying strategies impinging on MeHg exposure vulnerability.
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Affiliation(s)
- Lisa M Prince
- School of Health Sciences, Purdue University, West Lafayette, IN 47907-2051, United States
| | - Michael Aschner
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, NY 10461, United States
| | - Aaron B Bowman
- School of Health Sciences, Purdue University, West Lafayette, IN 47907-2051, United States.
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12
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Hufgard JR, Sprowles JLN, Pitzer EM, Koch SE, Jiang M, Wang Q, Zhang X, Biesiada J, Rubinstein J, Puga A, Williams MT, Vorhees CV. Prenatal exposure to PCBs in Cyp1a2 knock-out mice interferes with F 1 fertility, impairs long-term potentiation, reduces acoustic startle and impairs conditioned freezing contextual memory with minimal transgenerational effects. J Appl Toxicol 2018; 39:603-621. [PMID: 30561030 DOI: 10.1002/jat.3751] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2018] [Revised: 09/17/2018] [Accepted: 10/14/2018] [Indexed: 01/17/2023]
Abstract
Polychlorinated biphenyls (PCBs) are toxic environmental pollutants. Humans are exposed to PCB mixtures via contaminated food or water. PCB exposure causes adverse effects in adults and after exposure in utero. PCB toxicity depends on the congener mixture and CYP1A2 gene activity. For coplanar PCBs, toxicity depends on ligand affinity for the aryl hydrocarbon receptor (AHR). Previously, we found that perinatal exposure of mice to a three-coplanar/five-noncoplanar PCB mixture induced deficits in novel object recognition and trial failures in the Morris water maze in Cyp1a2-/- ::Ahrb1 C57BL6/J mice compared with wild-type mice (Ahrb1 = high AHR affinity). Here we exposed gravid Cyp1a2-/- ::Ahrb1 mice to a PCB mixture on embryonic day 10.5 by gavage and examined the F1 and F3 offspring (not F2 ). PCB-exposed F1 mice exhibited increased open-field central time, reduced acoustic startle, greater conditioned contextual freezing and reduced CA1 hippocampal long-term potentiation with no change in spatial learning or memory. F1 mice also had inhibited growth, decreased heart rate and cardiac output, and impaired fertility. F3 mice showed few effects. Gene expression changes were primarily in F1 PCB males compared with wild-type males. There were minimal RNA and DNA methylation changes in the hippocampus from F1 to F3 with no clear relevance to the functional effects. F0 PCB exposure during a period of rapid DNA de-/remethylation in a susceptible genotype produced clear F1 effects with little evidence of transgenerational effects in the F3 generation. While PCBs show clear developmental neurotoxicity, their effects do not persist across generations for effects assessed herein.
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Affiliation(s)
- Jillian R Hufgard
- Department of Pediatrics, University of Cincinnati College of Medicine, and Division of Neurology, Cincinnati Children's Research Foundation, Cincinnati, OH, 45229, USA
| | - Jenna L N Sprowles
- Department of Pediatrics, University of Cincinnati College of Medicine, and Division of Neurology, Cincinnati Children's Research Foundation, Cincinnati, OH, 45229, USA
| | - Emily M Pitzer
- Department of Pediatrics, University of Cincinnati College of Medicine, and Division of Neurology, Cincinnati Children's Research Foundation, Cincinnati, OH, 45229, USA
| | - Sheryl E Koch
- Department of Internal Medicine, Division of Cardiovascular Health and Disease, University of Cincinnati College of Medicine, Cincinnati, OH, 45267, USA
| | - Min Jiang
- Department of Internal Medicine, Division of Cardiovascular Health and Disease, University of Cincinnati College of Medicine, Cincinnati, OH, 45267, USA
| | - Qin Wang
- Department of Environmental Health, University of Cincinnati College of Medicine, Cincinnati, OH, 45267, USA
| | - Xiang Zhang
- Department of Environmental Health, University of Cincinnati College of Medicine, Cincinnati, OH, 45267, USA
| | - Jacek Biesiada
- Department of Environmental Health, University of Cincinnati College of Medicine, Cincinnati, OH, 45267, USA
| | - Jack Rubinstein
- Department of Internal Medicine, Division of Cardiovascular Health and Disease, University of Cincinnati College of Medicine, Cincinnati, OH, 45267, USA
| | - Alvaro Puga
- Department of Environmental Health, University of Cincinnati College of Medicine, Cincinnati, OH, 45267, USA
| | - Michael T Williams
- Department of Pediatrics, University of Cincinnati College of Medicine, and Division of Neurology, Cincinnati Children's Research Foundation, Cincinnati, OH, 45229, USA
| | - Charles V Vorhees
- Department of Pediatrics, University of Cincinnati College of Medicine, and Division of Neurology, Cincinnati Children's Research Foundation, Cincinnati, OH, 45229, USA
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Ghizoni H, Ventura M, Colle D, Gonçalves CL, de Souza V, Hartwig JM, Santos DB, Naime AA, Cristina de Oliveira Souza V, Lopes MW, Barbosa F, Brocardo PS, Farina M. Effects of perinatal exposure to n-3 polyunsaturated fatty acids and methylmercury on cerebellar and behavioral parameters in mice. Food Chem Toxicol 2018; 120:603-615. [DOI: 10.1016/j.fct.2018.08.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2018] [Revised: 08/01/2018] [Accepted: 08/02/2018] [Indexed: 12/20/2022]
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14
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Murugan K, Vasudevan N. Intracellular toxicity exerted by PCBs and role of VBNC bacterial strains in biodegradation. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2018; 157:40-60. [PMID: 29605643 DOI: 10.1016/j.ecoenv.2018.03.014] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Revised: 02/22/2018] [Accepted: 03/06/2018] [Indexed: 06/08/2023]
Abstract
Polychlorinated biphenyls (PCBs) are xenobiotic compounds that persists in the environment for long-term, though its productivity is banned. Abatement of the pollutants have become laborious due to it's recalcitrant nature in the environment leading to toxic effects in humans and other living beings. Biphenyl degrading bacteria co-metabolically degrade low chlorinated PCBs using the active metabolic pathway. bph operon possess different genetic arrangements in gram positive and gram negative bacteria. The binding ability of the genes and the active sites were determined by PCB docking studies. The active site of bphA gene with conserved amino acid residues determines the substrate specificity and biodegradability. Accumulation of toxic intermediates alters cellular behaviour, biomass production and downturn the metabolic activity. Several bacteria in the environment attain unculturable state which is viable and metabolically active but not cultivable (VBNC). Resuscitation-promoting factor (Rpf) and Rpf homologous protein retrieve the culturability of the so far uncultured bacteria. Recovery of this adaptive mechanism against various physical and chemical stressors make a headway in understanding the functionality of both environmental and medically important unculturable bacteria. Thus, this paper review about the general aspects of PCBs, cellular toxicity exerted by PCBs, role of unculturable bacterial strains in biodegradation, genes involved and degradation pathways. It is suggested to extrapolate the research findings on extracellular organic matters produced in culture supernatant of VBNC thus transforming VBNC to culturable state.
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Affiliation(s)
- Karuvelan Murugan
- Centre for Environmental Studies, Anna University, CEG Campus, Chennai, Tamil Nadu, India.
| | - Namasivayam Vasudevan
- Centre for Environmental Studies, Anna University, CEG Campus, Chennai, Tamil Nadu, India.
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15
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Tanaka Y, Fujiwara M, Shindo A, Yin G, Kitazawa T, Teraoka H. Aroclor 1254 and BDE-47 inhibit dopaminergic function manifesting as changes in locomotion behaviors in zebrafish embryos. CHEMOSPHERE 2018; 193:1207-1215. [PMID: 29874750 DOI: 10.1016/j.chemosphere.2017.11.138] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2017] [Revised: 11/21/2017] [Accepted: 11/22/2017] [Indexed: 06/08/2023]
Abstract
Contamination with polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs) in the environment is a major concern due to their persistent bioaccumulative toxicity that can disturb neurobehavioral functions including movements. Recently, it was reported that some PBDE including BDE-47 stimulates locomotor activities of zebrafish embryos by unknown mechanism. In this study, motor movements of the zebrafish embryo were used as a model system to evaluate the neuronal toxicity of a non-coplanar PCB-dominant mixture (Aroclor 1254) and BDE-47. Both organohalogens increased tail shaking and rotation of embryos in a concentration-dependent manner. Chemical inhibition and gene knock-down of tyrosine hydroxylase and vesicular monoamine transporter 2 (VMAT2) also induced hyperactivities. Hyperactivities induced by these treatments were all inhibited by supplementation of l-tyrosine and l-dopa, precursors of dopamine synthesis. Both organohalogens reduced dopamine contents and increased the 3,4-dihydroxyphenylacetic acid (DOPAC)/dopamine ratio in whole embryos. The results suggest that functional inhibition of dopaminergic neurons is involved in hyperactivities of zebrafish embryos caused by Aroclor 1254 and BDE-47.
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Affiliation(s)
- Yasuaki Tanaka
- School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu 069-8501, Japan
| | - Mari Fujiwara
- School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu 069-8501, Japan
| | - Asako Shindo
- School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu 069-8501, Japan; Division of Biological Sciences, Department of Molecular Biology, Nagoya University Graduate School of Science, Nagoya, Japan
| | - Guojun Yin
- Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization, Ministry of Agriculture, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China
| | - Takio Kitazawa
- School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu 069-8501, Japan
| | - Hiroki Teraoka
- School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu 069-8501, Japan.
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16
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Prince LM, Rand MD. Methylmercury exposure causes a persistent inhibition of myogenin expression and C2C12 myoblast differentiation. Toxicology 2018; 393:113-122. [PMID: 29104120 PMCID: PMC5757876 DOI: 10.1016/j.tox.2017.11.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Revised: 10/03/2017] [Accepted: 11/01/2017] [Indexed: 12/11/2022]
Abstract
Methylmercury (MeHg) is a ubiquitous environmental toxicant, best known for its selective targeting of the developing nervous system. MeHg exposure has been shown to cause motor deficits such as impaired gait and coordination, muscle weakness, and muscle atrophy, which have been associated with disruption of motor neurons. However, recent studies have suggested that muscle may also be a target of MeHg toxicity, both in the context of developmental myogenic events and of low-level chronic exposures affecting muscle wasting in aging. We therefore investigated the effects of MeHg on myotube formation, using the C2C12 mouse myoblast model. We found that MeHg inhibits both differentiation and fusion, in a concentration-dependent manner. Furthermore, MeHg specifically and persistently inhibits myogenin (MyoG), a transcription factor involved in myocyte differentiation, within the first six hours of exposure. MeHg-induced reduction in MyoG expression is contemporaneous with a reduction of a number of factors involved in mitochondrial biogenesis and mtDNA transcription and translation, which may implicate a role for mitochondria in mediating MeHg-induced change in the differentiation program. Unexpectedly, inhibition of myoblast differentiation with MeHg parallels inhibition of Notch receptor signaling. Our research establishes muscle cell differentiation as a target for MeHg toxicity, which may contribute to the underlying etiology of motor deficits with MeHg toxicity.
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Affiliation(s)
- Lisa M Prince
- University of Rochester School of Medicine and Dentistry, 601 Elmwood Avenue, Department of Environmental Medicine, Rochester, NY, 14642, USA.
| | - Matthew D Rand
- University of Rochester School of Medicine and Dentistry, 601 Elmwood Avenue, Department of Environmental Medicine, Rochester, NY, 14642, USA.
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17
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Prince LM, Rand MD. Notch Target Gene E(spl)mδ Is a Mediator of Methylmercury-Induced Myotoxicity in Drosophila. Front Genet 2018; 8:233. [PMID: 29379520 PMCID: PMC5775289 DOI: 10.3389/fgene.2017.00233] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2017] [Accepted: 12/22/2017] [Indexed: 01/09/2023] Open
Abstract
Methylmercury (MeHg) is a ubiquitous environmental contaminant and neurotoxicant that has long been known to cause a variety of motor deficits. These motor deficits have primarily been attributed to MeHg targeting of developing neurons and induction of oxidative stress and calcium dysregulation. Few studies have looked at how MeHg may be affecting fundamental signaling mechanisms in development, particularly in developing muscle. Studies in Drosophila recently revealed that MeHg perturbs embryonic muscle formation and upregulates Notch target genes, reflected predominantly by expression of the downstream transcriptional repressor Enhancer of Split mdelta [E(spl)mδ]. An E(spl)mδ reporter gene shows expression primarily in the myogenic domain, and both MeHg exposure and genetic upregulation of E(spl)mδ can disrupt embryonic muscle development. Here, we tested the hypothesis that developing muscle is targeted by MeHg via upregulation of E(spl)mδ using genetic modulation of E(spl)mδ expression in combination with MeHg exposure in developing flies. Developmental MeHg exposure causes a decreased rate of eclosion that parallels gross disruption of indirect flight muscle (IFM) development. An increase in E(spl) expression across the pupal stages, with preferential E(spl)mδ upregulation occurring at early (p5) stages, is also observed. E(spl)mδ overexpression in myogenic lineages under the Mef2 promoter was seen to phenocopy eclosion and IFM effects of developmental MeHg exposure; whereas reduced expression of E(spl)mδ shows rescue of eclosion and IFM morphology effects of MeHg exposure. No effects were seen on eclosion with E(spl)mδ overexpression in neural and gut tissues. Our data indicate that muscle development is a target for MeHg and that E(spl)mδ is a muscle-specific mediator of this myotoxicity. This research advances our knowledge of the target pathways that mediate susceptibility to MeHg toxicity, as well as a potential muscle development-specific role for E(spl)mδ.
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Affiliation(s)
- Lisa M Prince
- Department of Environmental Medicine, School of Medicine and Dentistry, University of Rochester, Rochester, NY, United States
| | - Matthew D Rand
- Department of Environmental Medicine, School of Medicine and Dentistry, University of Rochester, Rochester, NY, United States
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18
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Haijima A, Lesmana R, Shimokawa N, Amano I, Takatsuru Y, Koibuchi N. Differential neurotoxic effects of in utero and lactational exposure to hydroxylated polychlorinated biphenyl (OH-PCB 106) on spontaneous locomotor activity and motor coordination in young adult male mice. J Toxicol Sci 2017; 42:407-416. [PMID: 28717099 DOI: 10.2131/jts.42.407] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
We investigated whether in utero or lactational exposure to 4-hydroxy-2',3,3',4',5'-pentachlorobiphenyl (OH-PCB 106) affects spontaneous locomotor activity and motor coordination in young adult male mice. For in utero exposure, pregnant C57BL/6J mice received 0.05 or 0.5 mg/kg body weight of OH-PCB 106 or corn oil vehicle via gavage every second day from gestational day 10 to 18. For lactational exposure, the different groups of dams received 0.05 or 0.5 mg/kg body weight of OH-PCB 106 or corn oil vehicle via gavage every second day from postpartum day 3 to 13. At 6-7 weeks of age, the spontaneous locomotor activities of male offspring were evaluated for a 24-hr continuous session in a home cage and in an open field for 30-min. Motor coordination function on an accelerating rotarod was also measured. Mice exposed prenatally to OH-PCB 106 showed increased spontaneous locomotor activities during the dark phase in the home cage and during the first 10-min in the open field compared with control mice. Mice exposed lactationally to OH-PCB 106, however, did not show a time-dependent decrease in locomotor activity in the open field. Instead, their locomotor activity increased significantly during the second 10-min block. In addition, mice exposed lactationally to OH-PCB 106 displayed impairments in motor coordination in the rotarod test. These results suggest that perinatal exposure to OH-PCB 106 affects motor behaviors in young adult male mice. Depending on the period of exposure, OH-PCB 106 may have different effects on neurobehavioral development.
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Affiliation(s)
- Asahi Haijima
- Center for Medical Education, Gunma University Graduate School of Medicine.,Department of Integrative Physiology, Gunma University Graduate School of Medicine
| | - Ronny Lesmana
- Department of Integrative Physiology, Gunma University Graduate School of Medicine.,Department of Physiology, Universitas Padjadjaran, Indonesia
| | - Noriaki Shimokawa
- Department of Integrative Physiology, Gunma University Graduate School of Medicine.,Department of Nutrition, Takasaki University of Health and Welfare
| | - Izuki Amano
- Department of Integrative Physiology, Gunma University Graduate School of Medicine
| | - Yusuke Takatsuru
- Department of Integrative Physiology, Gunma University Graduate School of Medicine
| | - Noriyuki Koibuchi
- Department of Integrative Physiology, Gunma University Graduate School of Medicine
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19
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Fimm B, Sturm W, Esser A, Schettgen T, Willmes K, Lang J, Gaum PM, Kraus T. Neuropsychological effects of occupational exposure to polychlorinated biphenyls. Neurotoxicology 2017; 63:106-119. [PMID: 28947237 DOI: 10.1016/j.neuro.2017.09.011] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Revised: 09/20/2017] [Accepted: 09/21/2017] [Indexed: 12/22/2022]
Abstract
In the context of a health surveillance program for former PCB-exposed workers of a transformer and capacitor recycling company in Germany, their family members, employees of surrounding companies and area residents a broad range of cognitive functions covering attention, executive processing, reasoning, memory and motor performance was examined. The study aimed at identifying potential adverse effects of PCB load on cognitive functions. Detailed analysis of PCB burden of the participants revealed rather high correlations of lower and higher chlorinated as well as dioxin-like PCBs. Nearly one half of the participants exhibited increased burden in all three PCB classes whereas only 33 out of 237 participants did not show any increased PCB burden. Thus, data analysis followed a two-fold strategy: (1) Based on studies providing data on PCB exposure of the German general population the PCB burden of every participant was classified as normal (percentile rank PR <95) or increased (PR ≥95). Increased burden with respect to lower (LPCBs) and higher chlorinated (HPCBs) as well as dioxin-like (dlPCBs) PCBs was assumed if a participant showed at least one congener surpassing the PR95 criterion for the respective congener class and (2) Overall plasma PCB level per congener class was used as measure of PCB load. In a multivariate approach using structural equation modelling and multiple regression analysis we found a significant impact of PCBs on word fluency and sensorimotor processing irrespective of the measure of PCB burden (PR95 criterion or overall plasma level). However, no effect of PCB burden on memory, attention, and cognitive flexibility could be demonstrated. Particularly, an increase of LPCBs was associated with an overall reduction of verbal fluency of letter and semantic word generation as well as word production based on a single or two alternating criteria. In addition, participants with increased burden of LPCBs exhibited a time-on-task effect in terms of a stronger decline of performance with increasing duration of the verbal fluency task. Moreover, we found adverse effects of HPCBs on Aiming and of dlPCBs on Line Tracking. Results are discussed in terms of (1) a decrease of cerebral dopamine (DA) with non-coplanar PCBs resulting in an impact on fronto-striatal cerebral structures subserving verbal fluency and motor processing, (2) a PCB-induced reduction of norepinephrine leading to the time-on-task effect with verbal fluency, and (3) adverse effects of PCBs on dopaminergic receptors in the cerebellum resulting in impaired fine motor function.
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Affiliation(s)
- B Fimm
- RWTH Aachen University, Department of Neurology, Pauwelsstraße 30, D-52074 Aachen, Germany.
| | - W Sturm
- RWTH Aachen University, Department of Neurology, Pauwelsstraße 30, D-52074 Aachen, Germany
| | - A Esser
- RWTH Aachen University, Institute of Occupational Medicine, Pauwelsstraße 30, D-52074 Aachen, Germany
| | - T Schettgen
- RWTH Aachen University, Institute of Occupational Medicine, Pauwelsstraße 30, D-52074 Aachen, Germany
| | - K Willmes
- RWTH Aachen University, Department of Neurology, Pauwelsstraße 30, D-52074 Aachen, Germany
| | - J Lang
- RWTH Aachen University, Institute of Occupational Medicine, Pauwelsstraße 30, D-52074 Aachen, Germany
| | - P M Gaum
- RWTH Aachen University, Institute of Occupational Medicine, Pauwelsstraße 30, D-52074 Aachen, Germany
| | - T Kraus
- RWTH Aachen University, Institute of Occupational Medicine, Pauwelsstraße 30, D-52074 Aachen, Germany
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20
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Soualeh N, Dridi I, Eppe G, Némos C, Soulimani R, Bouayed J. Perinatal programming of depressive-like behavior by inflammation in adult offspring mice whose mothers were fed polluted eels: Gender selective effects. Brain Behav Immun 2017; 63:137-147. [PMID: 27702682 DOI: 10.1016/j.bbi.2016.09.029] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Revised: 09/21/2016] [Accepted: 09/30/2016] [Indexed: 02/07/2023] Open
Abstract
Several lines of evidence indicate that early-life inflammation may predispose to mental illness, including depression, in later-life. We investigated the impact of perinatal exposure to polluted eels on neonatal, postnatal, and adult brain inflammation, and on the resignation behavior of male and female adult offspring mice. The effects of maternal standard diet (laboratory food) were compared to the same diet enriched with low, intermediate, or highly polluted eels. Brain inflammatory markers including cytokines were assessed in offspring mice on the day of birth (i.e., on the postnatal day-PND 1), upon weaning (PND 21) and at adulthood (PND 100). Plasma myeloperoxidase and corticosterone levels were evaluated at PND 100. Immobility behavior of offspring was assessed in adulthood (i.e., at PNDs 95-100), using the tail suspension and forced swimming tests. Chronic brain inflammation was found in male and female offspring mice compared to controls, as assessed at PNDs 1, 21, and 100. The level of myeloperoxidase was found to be significantly higher in both adult males and females vs. control offspring. However, high corticosterone levels were only found in male offspring mice that were perinatally exposed to eels, suggesting a gender-selective dysregulation of the adult hypothalamic-pituitaryadrenal (HPA) axis. Gender-specific differences were also detected in adulthood in regard to offspring resignation behavior. Thus, compared to controls, males, but not females, whose mothers were fed eels during pregnancy and lactation exhibited a depressive-like behavior in adult age in both behavioral models of depression. Depressive symptoms were more pronounced in male mice perinatally exposed to either intermediate or highly polluted eels than those exposed to only lowly polluted eels. Our results indicate that early-life inflammatory insult is a plausible causative factor that induces the depressive phenotype exhibited by male adult offspring mice, most likely through a gender-specific HPA axis enhanced activation.
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Affiliation(s)
- Nidhal Soualeh
- Université de Lorraine, Neurotoxicologie Alimentaire et Bioactivité, BP 4102, 57040 Metz, France
| | - Imen Dridi
- Université de Lorraine, Neurotoxicologie Alimentaire et Bioactivité, BP 4102, 57040 Metz, France
| | - Gauthier Eppe
- Université de Liège, Inorganic Analytical Chemistry, CART (Center for Analytical and Research Technology), B-4000 Sart-Tilman, Belgium
| | - Christophe Némos
- Université de Lorraine, Neurotoxicologie Alimentaire et Bioactivité, BP 4102, 57040 Metz, France
| | - Rachid Soulimani
- Université de Lorraine, Neurotoxicologie Alimentaire et Bioactivité, BP 4102, 57040 Metz, France
| | - Jaouad Bouayed
- Université de Lorraine, Neurotoxicologie Alimentaire et Bioactivité, BP 4102, 57040 Metz, France.
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21
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Boucher O, Muckle G, Ayotte P, Dewailly E, Jacobson SW, Jacobson JL. Altered fine motor function at school age in Inuit children exposed to PCBs, methylmercury, and lead. ENVIRONMENT INTERNATIONAL 2016; 95:144-51. [PMID: 27575364 PMCID: PMC5035542 DOI: 10.1016/j.envint.2016.08.010] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2016] [Revised: 08/17/2016] [Accepted: 08/17/2016] [Indexed: 05/11/2023]
Abstract
BACKGROUND Motor deficits have frequently been reported in methylmercury (MeHg) poisoning in adults. However, whether exposure to neurotoxic contaminants from environmental sources early in life is associated with neuromotor impairments has received relatively little attention. This study examines the relation of developmental exposure to MeHg, polychlorinated biphenyls (PCBs), and lead to motor function in school-age Inuit children exposed through their traditional diet. METHODS In a prospective study in Nunavik, children (mean age=11.3years) were assessed on a battery of fine motor tasks, namely the Stanford-Binet Copying subtest (N=262), the Santa Ana Form Board, and the Finger Tapping Test (N=215). The relation of mercury (Hg; as an index of MeHg exposure), PCB congener 153 (PCB153), and lead concentrations in cord and current blood samples to task performance was examined using linear regression analyses. RESULTS After adjustment for potential confounders and control for the other contaminants, higher current PCB concentrations were associated with poorer Santa Ana Form Board and Finger Tapping performance. Results were virtually identical when PCB153 was replaced by other PCB congeners. Higher current Hg levels were independently associated with poorer Finger Tapping performance. CONCLUSIONS This is the first prospective longitudinal study in children to provide evidence of neuromotor impairments associated with postnatal exposure to seafood contaminants from environmental sources. Fine motor speed appears particularly sensitive to the effects of postnatal PCB exposure, which is unusually high in this population. Results with postnatal MeHg are concordant with previous cross-sectional studies with children and adults.
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Affiliation(s)
- Olivier Boucher
- Département de psychologie, Université de Montréal, Montréal, Québec, Canada; Centre de recherche du CHU de Québec, Québec, Québec, Canada
| | - Gina Muckle
- Centre de recherche du CHU de Québec, Québec, Québec, Canada; Université Laval, Québec, Québec, Canada
| | - Pierre Ayotte
- Centre de recherche du CHU de Québec, Québec, Québec, Canada; Université Laval, Québec, Québec, Canada
| | - Eric Dewailly
- Centre de recherche du CHU de Québec, Québec, Québec, Canada; Université Laval, Québec, Québec, Canada
| | - Sandra W Jacobson
- Department of Psychiatry and Behavioral Neurosciences, Wayne State University School of Medicine, Detroit, MI, USA
| | - Joseph L Jacobson
- Department of Psychiatry and Behavioral Neurosciences, Wayne State University School of Medicine, Detroit, MI, USA.
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22
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Garcia MS, Constantino DHJ, Silva APG, Perobelli JE. Fish pollutants MeHg and Aroclor cause permanent structural damage in male gonads and kidneys after prepubertal exposure. Int J Exp Pathol 2016; 97:360-368. [PMID: 27917541 PMCID: PMC5206816 DOI: 10.1111/iep.12200] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Accepted: 08/08/2016] [Indexed: 12/29/2022] Open
Abstract
This study investigated whether or not prepubertal exposure to the fish contaminants methylmercury (MeHg) and the polychlorinated bisphenol Aroclor in low doses interferes with the histomorphometry of the testes, epididymis, liver and kidneys in rats. Wistar male rats, 21 days old, were allocated into the following: control (n = 17, received corn oil), MeHg (n = 17, received MeHg at 0.5 mg/kg/day), Aroclor (n = 17, received Aroclor at 1.0 mg/kg/day), low mix (n = 18, received MeHg at 0.05 mg/kg/day and Aroclor at 0.1 mg/kg/day), high mix (n = 18, received MeHg at 0.5 mg/kg/day and Aroclor at 1.0 mg/kg/day). Dosing continued from post natal day (PND) 23 to 53, by gavage. Euthanasia was performed on PND 53; or, after an interval of 62 days without exposure to chemicals, on PND 115. The degree of maturation of the seminiferous epithelium was delayed in chemical-exposed groups and testicular interstitial oedema was observed at adulthood. The pattern of male gonad organization was changed in the Aroclor group on PND 53 and in all treated groups at adulthood. The animals from Aroclor, low mix and high mix groups showed a reduction in the number of Sertoli cells. Histological evidence of renal injury was observed in all chemical-exposed groups in both ages. A probable target for MeHg and Aroclor in the reproductive system was Sertoli cells, in which possible dysfunctions could be linked to the other testicular alterations. Curiously, the main deleterious effects were late outcomes, along with the absence of synergistic interaction of MeHg and Aroclor in the parameters investigated. In conclusion, fish pollutants MeHg and Aroclor caused permanent structural damage in male gonads and kidneys after prepubertal exposure, without showing clear chemical interactions.
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Affiliation(s)
- Mariana S. Garcia
- Central de Laboratórios de Ciência e Tecnologia AmbientalUniversidade Sagrado Coração, USCBauruSão PauloBrazil
| | - Dulce Helena J. Constantino
- Central de Laboratórios de Ciência e Tecnologia AmbientalUniversidade Sagrado Coração, USCBauruSão PauloBrazil
| | - Ana P. G. Silva
- Programa de Pós‐Gradução Interdisciplinar em Ciências da SaúdeUniversidade Federal de São Paulo, Campus Baixada SantistaSantosSão PauloBrazil
| | - Juliana E. Perobelli
- Departamento de Ciências do MarUniversidade Federal de São Paulo, Campus Baixada SantistaSantosSão PauloBrazil
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Bal-Price A, Lein PJ, Keil KP, Sethi S, Shafer T, Barenys M, Fritsche E, Sachana M, Meek MEB. Developing and applying the adverse outcome pathway concept for understanding and predicting neurotoxicity. Neurotoxicology 2016; 59:240-255. [PMID: 27212452 DOI: 10.1016/j.neuro.2016.05.010] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2016] [Revised: 05/13/2016] [Accepted: 05/13/2016] [Indexed: 12/12/2022]
Abstract
The Adverse Outcome Pathway (AOP) concept has recently been proposed to support a paradigm shift in regulatory toxicology testing and risk assessment. This concept is similar to the Mode of Action (MOA), in that it describes a sequence of measurable key events triggered by a molecular initiating event in which a stressor interacts with a biological target. The resulting cascade of key events includes molecular, cellular, structural and functional changes in biological systems, resulting in a measurable adverse outcome. Thereby, an AOP ideally provides information relevant to chemical structure-activity relationships as a basis for predicting effects of structurally similar compounds. AOPs could potentially also form the basis for qualitative and quantitative predictive modeling of the human adverse outcome resulting from molecular initiating or other key events for which higher-throughput testing methods are available or can be developed. A variety of cellular and molecular processes are known to be critical for normal function of the central (CNS) and peripheral nervous systems (PNS). Because of the biological and functional complexity of the CNS and PNS, it has been challenging to establish causative links and quantitative relationships between key events that comprise the pathways leading from chemical exposure to an adverse outcome in the nervous system. Following introduction of the principles of MOA and AOPs, examples of potential or putative adverse outcome pathways specific for developmental or adult neurotoxicity are summarized and aspects of their assessment considered. Their possible application in developing mechanistically informed Integrated Approaches to Testing and Assessment (IATA) is also discussed.
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Affiliation(s)
- Anna Bal-Price
- European Commission Joint Research Centre, Institute for Health and Consumer Protection, Ispra, Italy.
| | - Pamela J Lein
- Department of Molecular Biosciences, School of Veterinary Medicine, University of California Davis, Davis, CA 95616, USA
| | - Kimberly P Keil
- Department of Molecular Biosciences, School of Veterinary Medicine, University of California Davis, Davis, CA 95616, USA
| | - Sunjay Sethi
- Department of Molecular Biosciences, School of Veterinary Medicine, University of California Davis, Davis, CA 95616, USA
| | - Timothy Shafer
- Integrated Systems Toxicology Division, Office of Research and Development, U.S. Environmental Protection Agency, RTP, USA
| | - Marta Barenys
- IUF-Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany
| | - Ellen Fritsche
- IUF-Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany
| | - Magdalini Sachana
- European Commission Joint Research Centre, Institute for Health and Consumer Protection, Ispra, Italy
| | - M E Bette Meek
- McLaughlin Centre for Risk Science, University of Ottawa, Ottawa, Canada
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24
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Cheng J, Fujimura M, Bo D. Assessing pre/post-weaning neurobehavioral development for perinatal exposure to low doses of methylmercury. J Environ Sci (China) 2015; 38:36-41. [PMID: 26702966 DOI: 10.1016/j.jes.2015.05.027] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2015] [Revised: 05/26/2015] [Accepted: 05/28/2015] [Indexed: 06/05/2023]
Abstract
Fetuses and neonates are known to be high-risk groups for Methylmercury (MeHg) exposure. MeHg can be transferred to the fetus through the placenta and to newborn offspring through breast milk. The aim of the present study was to investigate the neurotoxic effects of low doses of MeHg (1 and 5μg/mL in drinking water) administration, from gestational day 1 to postnatal day (PND) 21, on the neurobehavioral development of rats. The results showed that the no-observed-effect level of MeHg is somewhere in the range of 1-4μg/mL. Neurobehavioral development analysis revealed a delayed appearance of cliff drop and negative geotaxis reflexes in the 5μg/mL MeHg exposure group. Developmental exposure to MeHg affected locomotor activity functions for the females, but not for the males, implying that the female pups were more vulnerable than the male pups. All pups exposed to 5μg/mL of MeHg showed a significant deficit in motor coordination in the rotarod test compared with controls, and the highest accumulated concentrations of Hg were found in the cerebellum, followed by the hippocampus and cerebral cortex, indicating that the cerebellum is a possible target for MeHg toxicity. We demonstrated adverse effects of developmental exposure to MeHg associated with tissue concentrations very close to the current human body burden of this persistent and bioaccumulative compound.
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Affiliation(s)
- Jinping Cheng
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
| | - Masatake Fujimura
- Department of Basic Medical Sciences, National Institute for Minamata Disease, Minamata, Kumamoto 867-0008, Japan
| | - Dandan Bo
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
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25
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Saeedi Saravi SS, Dehpour AR. Potential role of organochlorine pesticides in the pathogenesis of neurodevelopmental, neurodegenerative, and neurobehavioral disorders: A review. Life Sci 2015; 145:255-64. [PMID: 26549647 DOI: 10.1016/j.lfs.2015.11.006] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Revised: 11/01/2015] [Accepted: 11/04/2015] [Indexed: 12/27/2022]
Abstract
Organochlorine pesticides (OCPs) are persistent and bioaccumulative environmental contaminants with potential neurotoxic effects. The growing body of evidence has demonstrated that prenatal exposure to organochlorines (OCs) is associated with impairment of neuropsychological development. The hypothesis is consistent with recent studies emphasizing the correlation of environmental as well as genetic factors to the pathophysiology of neurodevelopmental and neurobehavioral defects. It has been suggested that maternal exposure to OCPs results in impaired motor and cognitive development in newborns and infants. Moreover, in utero exposure to these compounds contributes to the etiology of autism. Although impaired neurodevelopment occurs through prenatal exposure to OCs, breastfeeding causes postnatal toxicity in the infants. Parkinson's disease (PD) is another neurological disorder, which has been associated with exposure to OCs, leading to α-synuclein accumulation and depletion of dopaminergic neurons. The study aimed to review the potential association between pre- and post-natal exposure to OCs and impaired neurodevelopmental processes during pregnancy and neuropsychological diseases such as PD, behavioral alterations, seizures and autism.
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Affiliation(s)
- Seyed Soheil Saeedi Saravi
- Experimental Medicine Research Center, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran; Department of Pharmacology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran; Department of Toxicology-Pharmacology, Faculty of Pharmacy, Guilan University of Medical Sciences, Rasht, Iran
| | - Ahmad Reza Dehpour
- Experimental Medicine Research Center, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran; Department of Pharmacology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran.
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26
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Dridi I, Leroy D, Guignard C, Scholl G, Bohn T, Landoulsi A, Thomé JP, Eppe G, Soulimani R, Bouayed J. Dietary early-life exposure to contaminated eels does not impair spatial cognitive performances in adult offspring mice as assessed in the Y-maze and the Morris water maze. Nutr Res 2014; 34:1075-84. [DOI: 10.1016/j.nutres.2014.06.011] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2014] [Revised: 06/12/2014] [Accepted: 06/19/2014] [Indexed: 10/25/2022]
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27
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Viluksela M, Heikkinen P, van der Ven LTM, Rendel F, Roos R, Esteban J, Korkalainen M, Lensu S, Miettinen HM, Savolainen K, Sankari S, Lilienthal H, Adamsson A, Toppari J, Herlin M, Finnilä M, Tuukkanen J, Leslie HA, Hamers T, Hamscher G, Al-Anati L, Stenius U, Dervola KS, Bogen IL, Fonnum F, Andersson PL, Schrenk D, Halldin K, Håkansson H. Toxicological profile of ultrapure 2,2',3,4,4',5,5'-heptachlorbiphenyl (PCB 180) in adult rats. PLoS One 2014; 9:e104639. [PMID: 25137063 PMCID: PMC4138103 DOI: 10.1371/journal.pone.0104639] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2014] [Accepted: 07/10/2014] [Indexed: 11/19/2022] Open
Abstract
PCB 180 is a persistent non-dioxin-like polychlorinated biphenyl (NDL-PCB) abundantly present in food and the environment. Risk characterization of NDL-PCBs is confounded by the presence of highly potent dioxin-like impurities. We used ultrapure PCB 180 to characterize its toxicity profile in a 28-day repeat dose toxicity study in young adult rats extended to cover endocrine and behavioral effects. Using a loading dose/maintenance dose regimen, groups of 5 males and 5 females were given total doses of 0, 3, 10, 30, 100, 300, 1000 or 1700 mg PCB 180/kg body weight by gavage. Dose-responses were analyzed using benchmark dose modeling based on dose and adipose tissue PCB concentrations. Body weight gain was retarded at 1700 mg/kg during loading dosing, but recovered thereafter. The most sensitive endpoint of toxicity that was used for risk characterization was altered open field behavior in females; i.e. increased activity and distance moved in the inner zone of an open field suggesting altered emotional responses to unfamiliar environment and impaired behavioral inhibition. Other dose-dependent changes included decreased serum thyroid hormones with associated histopathological changes, altered tissue retinoid levels, decreased hematocrit and hemoglobin, decreased follicle stimulating hormone and luteinizing hormone levels in males and increased expression of DNA damage markers in liver of females. Dose-dependent hypertrophy of zona fasciculata cells was observed in adrenals suggesting activation of cortex. There were gender differences in sensitivity and toxicity profiles were partly different in males and females. PCB 180 adipose tissue concentrations were clearly above the general human population levels, but close to the levels in highly exposed populations. The results demonstrate a distinct toxicological profile of PCB 180 with lack of dioxin-like properties required for assignment of WHO toxic equivalency factor. However, PCB 180 shares several toxicological targets with dioxin-like compounds emphasizing the potential for interactions.
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Affiliation(s)
- Matti Viluksela
- Department of Environmental Health, National Institute for Health and Welfare, Kuopio, Finland
- Department of Environmental Science, University of Eastern Finland, Kuopio, Finland
- * E-mail:
| | - Päivi Heikkinen
- Department of Environmental Health, National Institute for Health and Welfare, Kuopio, Finland
| | - Leo T. M. van der Ven
- Centre for Health Protection, National Institute for Public Health and the Environment, Bilthoven, The Netherlands
| | - Filip Rendel
- Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Robert Roos
- Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Javier Esteban
- Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
- Instituto de Bioingeniería, Universidad Miguel Hernández de Elche, Elche (Alicante), Spain
| | - Merja Korkalainen
- Department of Environmental Health, National Institute for Health and Welfare, Kuopio, Finland
| | - Sanna Lensu
- Department of Environmental Health, National Institute for Health and Welfare, Kuopio, Finland
- Department of Biology of Physical Activity, University of Jyväskylä, Jyväskylä, Finland
| | - Hanna M. Miettinen
- Department of Environmental Health, National Institute for Health and Welfare, Kuopio, Finland
| | | | - Satu Sankari
- Department of Equine and Small Animal Medicine, University of Helsinki, Helsinki, Finland
| | - Hellmuth Lilienthal
- Center of Toxicology, IPA – Institute for Prevention and Occupational Medicine, German Social Accident Insurance, Ruhr University of Bochum, Bochum, Germany
| | - Annika Adamsson
- Department of Physiology, University of Turku, Turku, Finland
| | - Jorma Toppari
- Department of Physiology, University of Turku, Turku, Finland
- Department of Paediatrics, University of Turku, Turku, Finland
| | - Maria Herlin
- Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Mikko Finnilä
- Department of Anatomy and Cell Biology, University of Oulu, Oulu, Finland
| | - Juha Tuukkanen
- Department of Anatomy and Cell Biology, University of Oulu, Oulu, Finland
| | - Heather A. Leslie
- Institute for Environmental Studies, VU University Amsterdam, Amsterdam, The Netherlands
| | - Timo Hamers
- Institute for Environmental Studies, VU University Amsterdam, Amsterdam, The Netherlands
| | - Gerd Hamscher
- Institute of Food Chemistry and Food Biotechnology, Justus-Liebig University, Giessen, Germany
| | - Lauy Al-Anati
- Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Ulla Stenius
- Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Kine-Susann Dervola
- Department of Biochemistry, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway
| | - Inger-Lise Bogen
- Department of Biochemistry, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway
| | - Frode Fonnum
- Department of Biochemistry, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway
| | | | - Dieter Schrenk
- Food Chemistry and Toxicology, University of Kaiserslautern, Kaiserslautern, Germany
| | - Krister Halldin
- Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Helen Håkansson
- Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
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Bonfanti P, Comelli F, Assi L, Casati L, Colciago A, Villa S, Santagostino A, Costa B, Colombo A. Responsiveness of hepatic and cerebral cytochrome P450 in rat offspring prenatally and lactationally exposed to a reconstituted PCB mixture. ENVIRONMENTAL TOXICOLOGY 2014; 29:856-866. [PMID: 22987612 DOI: 10.1002/tox.21812] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2012] [Revised: 07/27/2012] [Accepted: 08/04/2012] [Indexed: 06/01/2023]
Abstract
Perinatal polychlorinated biphenyl (PCB) exposures still remain a serious health concern because offspring receive PCB burden from mother during vulnerable processes of development. Since cytochrome P450 (CYP) represents a toxicological endpoint, in the present study, representing an extended investigation of a previous multitasked one, we explored the long-term responsiveness of CYP1A and CYP2B isoforms by Western blot analysis in liver and whole brain of lactating (PN12), weaning (PN21), and adult offspring (PN60) rats prenatally and lactationally exposed to a reconstituted PCB mixture (RM) of noncoplanar PCB138, 153, 180, and coplanar PCB126 congeners. We chose highly chlorinated PCBs instead of lower chlorinated one, because their recalcitrance to biotransformation makes easy their accumulation/persistence in tissues and breast milk. Dioxin-like congener PCB126 binding aryl hydrocarbon receptor (AHR) is responsible of many toxic effects. Pregnant Sprague-Dawley dams with high affinity AHR received subcutaneous injection of RM (10 mg/kg body weight) daily during gestation (days 15-19) and twice a week during breast-feeding. The results evidenced a transfer of PCBs to neonates through milk and a significant responsiveness of hepatic CYP in both mothers and offspring. In liver of exposed progeny, CYP isoforms exhibited a significant increment at PN12 (70% over control) and at PN21 (270% over control). Contrary to dams, in adult PCB offspring CYP levels showed a decline up to values similar to those of control. This transient developmental responsiveness of CYP isoforms in offspring liver reflects roughly the time course of hepatic PCB levels previously reported. Even if congeners were detected in brain, we failed in evidencing a responsiveness of CYP isoforms probably because of region-specific CYP expression in this organ. In conclusion, induction of offspring hepatic CYP is index of liver PCB burden, and despite the insensitivity of whole brain CYP we cannot exclude brain vulnerability toward PCB. © 2012 Wiley Periodicals, Inc. Environ Toxicol 29: 856-866, 2014.
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Affiliation(s)
- Patrizia Bonfanti
- Dipartimento di Scienze dell'Ambiente e del Territorio, Università di Milano Bicocca, P.zza della Scienza 1, 20126 Milano, Italy
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29
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Hsi HC, Jiang CB, Yang TH, Chien LC. The neurological effects of prenatal and postnatal mercury/methylmercury exposure on three-year-old children in Taiwan. CHEMOSPHERE 2014; 100:71-76. [PMID: 24461425 DOI: 10.1016/j.chemosphere.2013.12.068] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2013] [Revised: 12/16/2013] [Accepted: 12/20/2013] [Indexed: 06/03/2023]
Abstract
This study attempts to elucidate the relationship between neurological effects and mercury/methylmercury concentrations in various biomarkers, including meconium, hair, fingernail, and toenail. Eight-three mother-infant pairs were recruited between August 2008 and December 2009, and follow-up examinations on these children were completed after three years. The Bayley Scales of Infant and Toddler Development (Bayley-III) for evaluating the cognitive, language, and motor development of three-year-old children were calculated and validated. The geometric mean of the total mercury concentration in meconium was 89.6 ng g(-1). The methylmercury concentrations in hair, fingernail, and toenail samples were 1.96, 0.64, and 0.55 μg g(-1), respectively. Seventy percent of children had hair methylmercury concentrations exceeding the U.S. environmental protection agency (EPA) reference of 1 μg g(-1). A significantly positive correlation was obtained between methylmercury levels in hair, fingernail, and toenail. These methylmercury levels were also significantly positively correlated with the children's fish intake and negatively correlated with a Bayley-III scale score of expressive language. The prenatal mercury exposure, however, did not show significant influence on neurological development. High fish consumption appears to be a critical risk factor for methylmercury levels in children and may cause a lower expressive language score.
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Affiliation(s)
- Hsing-Cheng Hsi
- Graduate Institute of Environmental Engineering, National Taiwan University, Taiwan
| | - Chuen-Bin Jiang
- Department of Pediatrics, Taipei Mackay Memorial Hospital, Taipei, Taiwan; Mackay Junior College of Medicine, Nursing and Management, Taipei, Taiwan
| | - Tzu-Hsuan Yang
- School of Public Health, Taipei Medical University, Taiwan
| | - Ling-Chu Chien
- School of Public Health, Taipei Medical University, Taiwan.
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30
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Persico AM, Merelli S. Environmental Factors in the Onset of Autism Spectrum Disorder. CURRENT DEVELOPMENTAL DISORDERS REPORTS 2014. [DOI: 10.1007/s40474-013-0002-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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31
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Lilienthal H, Heikkinen P, Andersson PL, van der Ven LT, Viluksela M. Dopamine-dependent behavior in adult rats after perinatal exposure to purity-controlled polychlorinated biphenyl congeners (PCB52 and PCB180). Toxicol Lett 2014. [DOI: 10.1016/j.toxlet.2013.10.016] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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32
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Péan S, Daouk T, Vignet C, Lyphout L, Leguay D, Loizeau V, Bégout ML, Cousin X. Long-term dietary-exposure to non-coplanar PCBs induces behavioral disruptions in adult zebrafish and their offspring. Neurotoxicol Teratol 2013; 39:45-56. [PMID: 23851001 DOI: 10.1016/j.ntt.2013.07.001] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2013] [Revised: 06/30/2013] [Accepted: 07/01/2013] [Indexed: 12/13/2022]
Abstract
The use of polychlorinated biphenyls (PCBs) has been banned for several decades. PCBs have a long biological half-life and high liposolubility which leads to their bioaccumulation and biomagnification through food chains over a wide range of trophic levels. Exposure can lead to changes in animal physiology and behavior and has been demonstrated in both experimental and field analyses. There are also potential risks to high trophic level predators, including humans. A maternal transfer has been demonstrated in fish as PCBs bind to lipids in eggs. In this study, behavioral traits (exploration and free swimming, with or without challenges) of contaminated zebrafish (Danio rerio) adults and their offspring (both as five-day-old larvae and as two-month-old fish reared under standard conditions) were measured using video-tracking. Long-term dietary exposure to a mixture of non-coplanar PCBs was used to mimic known environmental contamination levels and congener composition. Eight-week-old fish were exposed for eight months at 26-28 °C. Those exposed to an intermediate dose (equivalent to that found in the Loire Estuary, ∑(CB)=515 ng g⁻¹ dry weight in food) displayed behavioral disruption in exploration capacities. Fish exposed to the highest dose (equivalent to that found in the Seine Estuary, ∑(CB)=2302 ng g⁻¹ dry weight in food) displayed an increased swimming activity at the end of the night. In offspring, larval activity was increased and two-month-old fish occupied the bottom section of the tank less often. These findings call for more long-term experiments using the zebrafish model; the mechanisms underlying behavioral disruptions need to be understood due to their implications for both human health and their ecological relevance in terms of individual fitness and survival.
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Affiliation(s)
- Samuel Péan
- Ifremer, Laboratoire Ressources Halieutiques, Place Gaby Coll, BP 7, 17137 L'Houmeau, France
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33
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De Boever P, Wens B, Boix J, Felipo V, Schoeters G. Perinatal Exposure to Purity-Controlled Polychlorinated Biphenyl 52, 138, or 180 Alters Toxicogenomic Profiles in Peripheral Blood of Rats after 4 Months. Chem Res Toxicol 2013; 26:1159-67. [DOI: 10.1021/tx300510v] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Patrick De Boever
- Unit Environmental Risk and
Health, Flemish Institute for Technological Research (VITO), Industriezone Vlasmeer 7, 2400 Mol, Belgium
- Centre for Environmental Sciences, Hasselt University, Agoralaan Building D, 3590 Diepenbeek,
Belgium
| | - Britt Wens
- Unit Environmental Risk and
Health, Flemish Institute for Technological Research (VITO), Industriezone Vlasmeer 7, 2400 Mol, Belgium
| | - Jordi Boix
- Laboratory of Neurobiology, Centro de Investigación Principe Felipe, Avenida
Autopista del Saler 16, 46012 Valencia, Spain
| | - Vicente Felipo
- Laboratory of Neurobiology, Centro de Investigación Principe Felipe, Avenida
Autopista del Saler 16, 46012 Valencia, Spain
| | - Greet Schoeters
- Unit Environmental Risk and
Health, Flemish Institute for Technological Research (VITO), Industriezone Vlasmeer 7, 2400 Mol, Belgium
- Department of Biomedical Sciences, University of Antwerp, Universiteitsplein 1, 2610 Antwerp,
Belgium
- Department of Environmental
Medicine, University of Southern Denmark, J.B. Winslowsvej 17A, 5100 Odense, Denmark
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Impact of quercetin on PCBs (Aroclor-1254)-induced impairment of dopaminergic receptors expression in hippocampus of adult male Wistar rats. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.bionut.2012.07.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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35
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Manto M. Cerebellotoxic Agents. HANDBOOK OF THE CEREBELLUM AND CEREBELLAR DISORDERS 2013:2079-2117. [DOI: 10.1007/978-94-007-1333-8_96] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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36
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Forns J, Lertxundi N, Aranbarri A, Murcia M, Gascon M, Martinez D, Grellier J, Lertxundi A, Julvez J, Fano E, Goñi F, Grimalt JO, Ballester F, Sunyer J, Ibarluzea J. Prenatal exposure to organochlorine compounds and neuropsychological development up to two years of life. ENVIRONMENT INTERNATIONAL 2012; 45:72-77. [PMID: 22575806 DOI: 10.1016/j.envint.2012.04.009] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2012] [Revised: 04/12/2012] [Accepted: 04/14/2012] [Indexed: 05/31/2023]
Abstract
Polychlorinated biphenyls (PCB), hexachlorobenzene (HCB), and dichlorodiphenyl dichloroethylene (pp'DDE) are persistent, bioaccumulative, and toxic environmental pollutants with potential neurotoxic effects. Despite a growing body of studies investigating the health effects associated with these compounds, their specific effects on early neuropsychological development remain unclear. We investigated such neuropsychological effects in a population-based birth cohort based in three regions in Spain (Sabadell, Gipuzkoa, and Valencia) derived from the INMA [Environment and Childhood] Project. The main analyses in this report were based on 1391 mother-child pairs with complete information on maternal levels of organochlorine compounds and child neuropsychological assessment (Bayley Scales of Infant Development) at age 14 months. We found that prenatal PCB exposure, particularly to congeners 138 and 153, resulted in impairment of psychomotor development (coefficient=-1.24, 95% confidence interval=-2.41, -0.07), but found no evidence for effects on cognitive development. Prenatal exposure to pp'DDE or HCB was not associated with early neuropsychological development. The negative effects of exposure to PCBs on early psychomotor development suggest that the potential neurotoxic effects of these compounds may be evident even at low doses.
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Affiliation(s)
- Joan Forns
- Centre for Research in Environmental Epidemiology (CREAL), Barcelona, Spain.
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Selvakumar K, Bavithra S, Krishnamoorthy G, Venkataraman P, Arunakaran J. Polychlorinated biphenyls-induced oxidative stress on rat hippocampus: a neuroprotective role of quercetin. ScientificWorldJournal 2012; 2012:980314. [PMID: 22272182 PMCID: PMC3259506 DOI: 10.1100/2012/980314] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2011] [Accepted: 11/22/2011] [Indexed: 12/22/2022] Open
Abstract
Present study is aimed to evaluate the ameliorative role of quercetin on PCBs-induced oxidative stress in hippocampus of Wistar rats. Group I rats received vehicle (corn oil) intraperitoneally (i.p); Group II received quercetin 50 mg/kg bwt/day (gavage); Group III received PCB 2 mg/kg bwt/day (i.p); Group IV received PCB (i.p) and simultaneously quercetin through gavage. After 30 days, rats were euthanized and hippocampus was dissected from each rat brain. Oxidative stress was assessed by determining the levels of H2O2, LPO, Pcc, and alteration in the functional markers such as CK, AchE, and ATPases activities in the hippocampus of control and experimental animals. A significant increase in the levels of stress markers and decrease in level of functional markers were observed in PCBs-treated rats. Moreover DNA fragmentation and histological studies were ascertained to confirm PCBs toxicity. In conclusion, quercetin shows a protective role against PCBs-induced oxidative damage in rat hippocampus.
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Affiliation(s)
- Kandaswamy Selvakumar
- Department of Endocrinology, Dr. ALM Post Graduate Institute of Basic Medical Sciences, University of Madras, Chennai 600113, India
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38
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Abstract
The cerebellum is particularly vulnerable to intoxication and poisoning, especially so the cerebellar cortex and Purkinje neurons. In humans, the most common cause of a toxic lesion to the cerebellar circuitry is alcohol related, but the cerebellum is also a main target of drug exposure (such as anticonvulsants, antineoplastics, lithium salts, calcineurin inhibitors), drug abuse and addiction (such as cocaine, heroin, phencyclidine), and environmental toxins (such as mercury, lead, manganese, toluene/benzene derivatives). Although data for the prevalence and incidence of cerebellar lesions related to intoxication and poisoning are still unknown in many cases, clinicians should keep in mind the list of agents that may cause cerebellar deficits, since toxin-induced cerebellar ataxias are not rare in daily practice. Moreover, the patient's status may require immediate therapies when the intoxication is life-threatening.
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Affiliation(s)
- Mario Manto
- Unité d'Etude du Mouvement, FNRS Neurologie, ULB Erasme, Brussels, Belgium.
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39
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Curran CP, Nebert DW, Genter MB, Patel KV, Schaefer TL, Skelton MR, Williams MT, Vorhees CV. In utero and lactational exposure to PCBs in mice: adult offspring show altered learning and memory depending on Cyp1a2 and Ahr genotypes. ENVIRONMENTAL HEALTH PERSPECTIVES 2011; 119:1286-93. [PMID: 21571617 PMCID: PMC3230394 DOI: 10.1289/ehp.1002965] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2010] [Accepted: 05/13/2011] [Indexed: 05/04/2023]
Abstract
BACKGROUND Both coplanar and noncoplanar polychlorinated biphenyls (PCBs) exhibit neurotoxic effects in animal studies, but individual congeners do not always produce the same effects as PCB mixtures. Humans genetically have > 60-fold differences in hepatic cytochrome P450 1A2 (CYP1A2)-uninduced basal levels and > 12-fold variability in aryl hydrocarbon receptor (AHR)affinity; because CYP1A2 is known to sequester coplanar PCBs and because AHR ligands include coplanar PCBs, both genotypes can affect PCB response. OBJECTIVES We aimed to develop a mouse paradigm with extremes in Cyp1a2 and Ahr genotypes to explore genetic susceptibility to PCB-induced developmental neurotoxicity using an environmentally relevant mixture of PCBs. METHODS We developed a mixture of eight PCBs to simulate human exposures based on their reported concentrations in human tissue, breast milk, and food supply. We previously characterized specific differences in PCB congener pharmacokinetics and toxicity, comparing high-affinity-AHR Cyp1a2 wild-type [Ahrb1_Cyp1a2(+/+)], poor-affinity-AHR Cyp1a2 wild-type [Ahrd_Cyp1a2(+/+)], and high-affinity-AHR Cyp1a2 knockout [Ahrb1_Cyp1a2(-/-)] mouse lines [Curran CP, Vorhees CV, Williams MT, Genter MB, Miller ML, Nebert DW. 2011. In utero and lactational exposure to a complex mixture of polychlorinated biphenyls: toxicity in pups dependent on the Cyp1a2 and Ahr genotypes. Toxicol Sci 119:189-208]. Dams received a mixture of three coplanar and five noncoplanar PCBs on gestational day 10.5 and postnatal day (PND) 5. In the present study we conducted behavioral phenotyping of exposed offspring at PND60, examining multiple measures of learning, memory, and other behaviors. RESULTS We observed the most significant deficits in response to PCB treatment in Ahrb1_Cyp1a2(-/-) mice, including impaired novel object recognition and increased failure rate in the Morris water maze. However, all PCB-treated genotypes showed significant differences on at least one measure of learning or behavior. CONCLUSIONS High levels of maternal hepatic CYP1A2 offer the most important protection against deficits in learning and memory in offspring exposed to a mixture of coplanar and noncoplanar PCBs. High-affinity AHR is the next most important factor in protection of offspring.
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Affiliation(s)
- Christine P Curran
- Department of Environmental Health and Center for Environmental Genetics, University of Cincinnati Medical Center, Cincinnati, Ohio, USA
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40
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Polychlorinated Biphenyl (PCBs)-Induced Oxidative Stress Plays a Critical Role on Cerebellar Dopaminergic Receptor Expression: Ameliorative Role of Quercetin. Neurotox Res 2011; 21:149-59. [DOI: 10.1007/s12640-011-9253-z] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2011] [Revised: 06/15/2011] [Accepted: 06/16/2011] [Indexed: 10/18/2022]
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41
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Transcriptomics identifies differences between ultrapure non-dioxin-like polychlorinated biphenyls (PCBs) and dioxin-like PCB126 in cultured peripheral blood mononuclear cells. Toxicology 2011; 287:113-23. [PMID: 21703328 DOI: 10.1016/j.tox.2011.06.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2011] [Revised: 05/30/2011] [Accepted: 06/07/2011] [Indexed: 01/01/2023]
Abstract
Polychlorinated biphenyls (PCBs) remain ubiquitously present in human lipids despite the ban on their production and use. Their presence can be chemically monitored in peripheral blood samples of the general population. We tested whether in vitro exposure to different PCB congeners induced different gene expression profiles in peripheral blood cells. We have isolated peripheral blood mononuclear cells (PBMC) from whole blood of 8 healthy individuals and exposed these cells in vitro to individual non-dioxin-like (NDL)-PCB congeners (PCB52, 138 or 180; 10μM) or dioxin-like (DL)-PCB congener PCB126 (1μM) during 18h. Differential gene expression response was measured using Agilent whole-human genome microarrays. Two-way ANOVA analysis of the data showed that both gender and PCB exposure are important factors influencing gene expression responses in blood cells. Hierarchical cluster analysis of genes influenced by PCB exposure, revealed that DL-PCB126 induced a different gene expression response compared to the NDL-PCBs. Biological interpretation of the results revealed that exposure to PCB126 induced the AhR signaling pathway, whereas the induction of nuclear receptor pathways by the NDL-PCBs was limited in blood cells. Nevertheless, molecular responses of blood cells to individual PCB congeners revealed significantly expressed genes that play a role in biological functions and processes known to be affected by PCB exposure in vivo. Observed gene expression changes in this in vitro model were found to be related to hepatotoxicity, immune and inflammatory response and disturbance of lipid and cholesterol homeostasis.
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Johansen EB, Knoff M, Fonnum F, Lausund PL, Walaas SI, Wøien G, Sagvolden T. Postnatal exposure to PCB 153 and PCB 180, but not to PCB 52, produces changes in activity level and stimulus control in outbred male Wistar Kyoto rats. Behav Brain Funct 2011; 7:18. [PMID: 21615898 PMCID: PMC3126714 DOI: 10.1186/1744-9081-7-18] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2010] [Accepted: 05/26/2011] [Indexed: 12/28/2022] Open
Abstract
Background Polychlorinated biphenyls (PCBs) are a class of organic compounds that bioaccumulate due to their chemical stability and lipophilic properties. Humans are prenatally exposed via trans-placental transfer, through breast milk as infants, and through fish, seafood and fatty foods as adolescents and adults. Exposure has several reported effects ranging from developmental abnormalities to cognitive and motor deficiencies. In the present study, three experimental groups of rats were orally exposed to PCBs typically found in human breast milk and then behaviorally tested for changes in measures of stimulus control (percentage lever-presses on the reinforcer-producing lever), activity level (responses with IRTs > 0.67 s), and responses with short IRTs (< 0.67 s). Methods Male offspring from Wistar Kyoto (WKY/NTac) dams purchased pregnant from Taconic Farms (Germantown, NY) were orally given PCB at around postnatal day 8, 14, and 20 at a dose of 10 mg/kg body weight at each exposure. Three experimental groups were exposed either to PCB 52, PCB 153, or PCB 180. A fourth group fed corn oil only served as controls. From postnatal day 25, for 33 days, the animals were tested for behavioral changes using an operant procedure. Results PCB exposure did not produce behavioral changes during training when responding was frequently reinforced using a variable interval 3 s schedule. When correct responses were reinforced on a variable interval 180 s schedule, animals exposed to PCB 153 or PCB 180 were less active than controls and animals exposed to PCB 52. Stimulus control was better in animals exposed to PCB 180 than in controls and in the PCB 52 group. Also, the PCB 153 and PCB 180 groups had fewer responses with short IRTs than the PCB 52 group. No effects of exposure to PCB 52 were found when compared to controls. Conclusions Exposure to PCBs 153 and 180 produced hypoactivity that continued at least five weeks after the last exposure. No effects of exposure to PCB 52 were observed.
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Affiliation(s)
- Espen Borgå Johansen
- Department of Physiology, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway.
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43
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Developmental exposure to methylmercury and 2,2′,4,4′,5,5′-hexachlorobiphenyl (PCB153) affects cerebral dopamine D1-like and D2-like receptors of weanling and pubertal rats. Arch Toxicol 2011; 85:1281-94. [DOI: 10.1007/s00204-011-0660-y] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2010] [Accepted: 01/25/2011] [Indexed: 11/25/2022]
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Zoeller RT. Endocrine Disruption of the Thyroid and its Consequences in Development. RESEARCH AND PERSPECTIVES IN ENDOCRINE INTERACTIONS 2011. [DOI: 10.1007/978-3-642-22775-2_4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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45
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Jolous-Jamshidi B, Cromwell HC, McFarland AM, Meserve LA. Perinatal exposure to polychlorinated biphenyls alters social behaviors in rats. Toxicol Lett 2010; 199:136-43. [PMID: 20813172 DOI: 10.1016/j.toxlet.2010.08.015] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2010] [Revised: 08/23/2010] [Accepted: 08/24/2010] [Indexed: 01/25/2023]
Abstract
Perinatal exposure to polychlorinated biphenyls (PCBs) leads to significant alterations of neural and hormonal systems. These alterations have been shown to impair motor and sensory development. Less is known about the influence of PCB exposure on developing emotional and motivational systems involved in social interactions and social learning. The present study examined the impact of perinatal PCB exposure (mixture of congeners 47 and 77) on social recognition in juvenile animals, conspecific-directed investigation in adults and on neural and hormonal systems involved in social functions. We used a standard habituation-dishabituation paradigm to evaluate juvenile recognition and a social port paradigm to monitor adult social investigation. Areal measures of the periventricular nucleus (PVN) of the hypothalamus were obtained to provide correlations with related hormone and brain systems. PCB exposed rats were significantly impaired in social recognition as indicated by persistent conspecific-directed exploration by juvenile animals regardless of social experience. As adults, PCB exposure led to a dampening of the isolation-induced enhancement of social investigation. There was not a concomitant alteration of social investigation in pair-housed PCB exposed animals at this stage of development. Interestingly, PVN area was significantly decreased in juvenile animals exposed to PCB during the perinatal period. Shifts in hypothalamic regulation of hormones involved in social behavior and stress could be involved in the behavioral changes observed. Overall, the results suggest that PCB exposure impairs context or experience-dependent modulation of social approach and investigation. These types of social-context deficits are similar to behavioral deficits observed in social disorders such as autism and other pervasive developmental disorders.
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Affiliation(s)
- Banafsheh Jolous-Jamshidi
- Department of Biological Sciences, Bowling Green State University, Bowling Green, OH 43403-0208, USA
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46
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Pessah IN, Cherednichenko G, Lein PJ. Minding the calcium store: Ryanodine receptor activation as a convergent mechanism of PCB toxicity. Pharmacol Ther 2010; 125:260-85. [PMID: 19931307 PMCID: PMC2823855 DOI: 10.1016/j.pharmthera.2009.10.009] [Citation(s) in RCA: 172] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2009] [Accepted: 10/30/2009] [Indexed: 11/24/2022]
Abstract
Chronic low-level polychlorinated biphenyl (PCB) exposures remain a significant public health concern since results from epidemiological studies indicate that PCB burden is associated with immune system dysfunction, cardiovascular disease, and impairment of the developing nervous system. Of these various adverse health effects, developmental neurotoxicity has emerged as a particularly vulnerable endpoint in PCB toxicity. Arguably the most pervasive biological effects of PCBs could be mediated by their ability to alter the spatial and temporal fidelity of Ca2+ signals through one or more receptor-mediated processes. This review will focus on our current knowledge of the structure and function of ryanodine receptors (RyRs) in muscle and nerve cells and how PCBs and related non-coplanar structures alter these functions. The molecular and cellular mechanisms by which non-coplanar PCBs and related structures alter local and global Ca2+ signaling properties and the possible short and long-term consequences of these perturbations on neurodevelopment and neurodegeneration are reviewed.
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Affiliation(s)
- Isaac N Pessah
- Department of Molecular Biosciences, School of Veterinary Medicine, University of California, Davis, CA 95616, USA.
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47
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Aschner* M, Onishchenko N, Ceccatelli S. Toxicology of Alkylmercury Compounds. ORGANOMETALLICS IN ENVIRONMENT AND TOXICOLOGY 2010. [DOI: 10.1039/9781849730822-00403] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Methylmercury is a global pollutant and potent neurotoxin whose abundance in the food chain mandates additional studies on the consequences and mechanisms of its toxicity to the central nervous system. Formulation of our new hypotheses was predicated on our appreciation for (a) the remarkable affinity of mercurials for the anionic form of sulfhydryl (-SH) groups, and (b) the essential role of thiols in protein biochemistry. The present chapter addresses pathways to human exposure of various mercury compounds, highlighting their neurotoxicity and potential involvement in neurotoxic injury and neurodegenerative changes, both in the developing and senescent brain. Mechanisms that trigger these effects are discussed in detail.
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Affiliation(s)
- Michael Aschner*
- Vanderbilt University School of Medicine, Department of Pediatrics Pharmacology, and the Kennedy Center for Research on Human Development Nashville TN 37232 USA
| | | | - Sandra Ceccatelli
- Karolinska Institute, Department of Neuroscience SE-17177 Stockholm Sweden
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Advancing the selection of neurodevelopmental measures in epidemiological studies of environmental chemical exposure and health effects. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2010; 7:229-68. [PMID: 20195443 PMCID: PMC2819786 DOI: 10.3390/ijerph7010229] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/27/2009] [Accepted: 01/11/2010] [Indexed: 11/17/2022]
Abstract
With research suggesting increasing incidence of pediatric neurodevelopmental disorders, questions regarding etiology continue to be raised. Neurodevelopmental function tests have been used in epidemiology studies to evaluate relationships between environmental chemical exposures and neurodevelopmental deficits. Limitations of currently used tests and difficulties with their interpretation have been described, but a comprehensive critical examination of tests commonly used in studies of environmental chemicals and pediatric neurodevelopmental disorders has not been conducted. We provide here a listing and critical evaluation of commonly used neurodevelopmental tests in studies exploring effects from chemical exposures and recommend measures that are not often used, but should be considered. We also discuss important considerations in selecting appropriate tests and provide a case study by reviewing the literature on polychlorinated biphenyls.
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Colciago A, Casati L, Mornati O, Vergoni A, Santagostino A, Celotti F, Negri-Cesi P. Chronic treatment with polychlorinated biphenyls (PCB) during pregnancy and lactation in the rat. Toxicol Appl Pharmacol 2009; 239:46-54. [DOI: 10.1016/j.taap.2009.04.023] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2009] [Revised: 04/01/2009] [Accepted: 04/14/2009] [Indexed: 01/05/2023]
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50
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Folven KI, Glover CN, Malde MK, Lundebye AK. Does selenium modify neurobehavioural impacts of developmental methylmercury exposure in mice? ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2009; 28:111-119. [PMID: 21783990 DOI: 10.1016/j.etap.2009.03.007] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2009] [Revised: 03/03/2009] [Accepted: 03/04/2009] [Indexed: 05/31/2023]
Abstract
There is controversy as to whether low-level chronic exposure to methylmercury (MeHg) through maternal fish consumption may cause subtle effects in the developing child, owing in part to the potential ameliorating effects of beneficial seafood nutrients. The aim of the present investigation was to assess the ameliorating potential of selenium (Se; as the naturally occurring methionine complex) on the neurobehavioural toxicity of foodborne MeHg (as the naturally occurring cysteinate) in prenatally exposed mice. Pups from dams exposed to a diet containing 3mg/kg of MeHg fed throughout gestation showed delayed fur development and impaired performance in a motor function assessment. These effects were not apparent in pups born to dams concurrently exposed to Se (at 1.3mg/kg). These results, using natural dietary forms of the elements administered through the relevant exposure pathway, suggest only minor impacts of MeHgCys on neurobehaviour, and possible amelioration of these effects by Se.
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Affiliation(s)
- Kristin I Folven
- National Institute of Nutrition and Seafood Research (NIFES), Bergen, Norway
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