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Kowalik K, Sechman A. In vitro effects of polychlorinated biphenyls and their hydroxylated metabolites on the synthesis and metabolism of iodothyronines in the chicken (Gallus domesticus) thyroid gland. Gen Comp Endocrinol 2022; 318:113989. [PMID: 35151725 DOI: 10.1016/j.ygcen.2022.113989] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Revised: 02/02/2022] [Accepted: 02/08/2022] [Indexed: 11/17/2022]
Abstract
To assess the effect of polychlorinated biphenyls (PCBs) and their hydroxylated metabolites (OH-PCBs) on thyroid hormone [TH: thyroxine (T4) and triiodothyronine (T3)] secretion, the concentrations of iodothyronine deiodinases (DIO1, DIO2, DIO3), and mRNA expression of genes involved in TH synthesis (TSHR, NIS, TPO, TG), metabolism (DIO1, DIO2, DIO3), and transport (OATP1C1, MCT8, MCT10, LAT1), chicken thyroid explants were incubated in medium supplemented with TSH (250 mU/ml), PCB118, PCB153, 4-OH-PCB107, and 3-OH-PCB153 (0.5 × 10-8 M), and TSH together with each PCB and OH-PCB. The results of the in vitro experiment revealed that, except for 4-OH-PCB107, all applied PCBs and OH-PCBs inhibited basal and TSH-stimulated T4 secretion. Moreover, they increased basal and reduced TSH-stimulated T3 secretion. PCBs and OH-PCBs decreased the TSH-stimulated TSHR expression. Following PCB and OH-PCB exposure, significant changes in mRNA expression of NIS, TPO, and TG were observed. PCBs and OH-PCBs affected DIO1 and DIO3 transcript levels and protein abundances of each DIO. Furthermore, PCB-dependent effects on OATP1C1, MCT8, and MCT10 mRNA expression were found. In conclusion, both PCB118 and PCB153 and their OH-PCBs affect TH synthesis and deiodination processes in the chicken thyroid gland and influence TH transport across the thyrocyte membrane. In addition, the effects of PCBs and OH-PCBs depended mainly on the type of PCB congener and the exposure time. These results indicate that not only parental PCBs but also OH-PCBs are hazardous for the thyroid gland and may disrupt its endocrine function. Further studies are necessary to explain a mechanism of PCB and OH-PCB action in the avian thyroid gland.
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Affiliation(s)
- Kinga Kowalik
- Department of Animal Physiology and Endocrinology, University of Agriculture in Krakow, Al. Mickiewicza 24/28, 30-059 Krakow, Poland.
| | - Andrzej Sechman
- Department of Animal Physiology and Endocrinology, University of Agriculture in Krakow, Al. Mickiewicza 24/28, 30-059 Krakow, Poland
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Abstract
Polychlorinated biphenyls (PCBs) are carcinogens causing endocrine disruption. While production of PCBs is now banned, wildlife exposure still occurs due to environmental contamination. We investigated thyroid toxicity in wild ungulates using three-dimensional primary thyrocyte cultures exposed to PCB 138 for 24, 48, and 72 h at concentrations ranging within 0–3000 ng/ml. Thyrocyte viability ranged within 78.71–118.34%, 98.14–104.45%, and 84.16–106.70% in fallow deer-, mouflon-, and roe deer-derived cells, respectively. Viability decreased significantly in fallow deer (P = 0.012) and roe deer (P = 0.002) thyrocytes exposed for 48 h at 30 ng/ml. While cytotoxicity ranged within 2.36–16.37%, 3.19–9.85%, and 2.76–11.21% in fallow deer, mouflon, and roe deer, respectively, only roe deer displayed significantly higher cytotoxicity at a 3 ng/ml exposure (P < 0.05) and lower cytotoxicity at 30 ng/ml (P < 0.01). Exposure to 30 ng/ml for 24 and 48 h induced reactive oxygen species in fallow deer. Iodide uptake at 30 ng/ml exposure increased after 24 h in fallow and roe deer, but showed a significant drop after 48 and 72 h in fallow deer, mouflon, and roe deer. Thyroxine T4 release at 30 ng/ml exposure decreased significantly after 48 and 72 h; 24, 48 and 72 h; and 48 h in fallow deer, mouflon, and roe deer, respectively. Our findings indicate time- and species-dependent effects of PCB on performance and thyrocyte function. Use of cell culture models reduces the number of experimental specimens, increases test species welfare and replaces whole organisms with specific target cells.
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SCREENED: A Multistage Model of Thyroid Gland Function for Screening Endocrine-Disrupting Chemicals in a Biologically Sex-Specific Manner. Int J Mol Sci 2020; 21:ijms21103648. [PMID: 32455722 PMCID: PMC7279272 DOI: 10.3390/ijms21103648] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Revised: 05/04/2020] [Accepted: 05/14/2020] [Indexed: 12/12/2022] Open
Abstract
Endocrine disruptors (EDs) are chemicals that contribute to health problems by interfering with the physiological production and target effects of hormones, with proven impacts on a number of endocrine systems including the thyroid gland. Exposure to EDs has also been associated with impairment of the reproductive system and incidence in occurrence of obesity, type 2 diabetes, and cardiovascular diseases during ageing. SCREENED aims at developing in vitro assays based on rodent and human thyroid cells organized in three different three-dimensional (3D) constructs. Due to different levels of anatomical complexity, each of these constructs has the potential to increasingly mimic the structure and function of the native thyroid gland, ultimately achieving relevant features of its 3D organization including: 1) a 3D organoid based on stem cell-derived thyrocytes, 2) a 3D organoid based on a decellularized thyroid lobe stromal matrix repopulated with stem cell-derived thyrocytes, and 3) a bioprinted organoid based on stem cell-derived thyrocytes able to mimic the spatial and geometrical features of a native thyroid gland. These 3D constructs will be hosted in a modular microbioreactor equipped with innovative sensing technology and enabling precise control of cell culture conditions. New superparamagnetic biocompatible and biomimetic particles will be used to produce "magnetic cells" to support precise spatiotemporal homing of the cells in the 3D decellularized and bioprinted constructs. Finally, these 3D constructs will be used to screen the effect of EDs on the thyroid function in a unique biological sex-specific manner. Their performance will be assessed individually, in comparison with each other, and against in vivo studies. The resulting 3D assays are expected to yield responses to low doses of different EDs, with sensitivity and specificity higher than that of classical 2D in vitro assays and animal models. Supporting the "Adverse Outcome Pathway" concept, proteogenomic analysis and biological computational modelling of the underlying mode of action of the tested EDs will be pursued to gain a mechanistic understanding of the chain of events from exposure to adverse toxic effects on thyroid function. For future uptake, SCREENED will engage discussion with relevant stakeholder groups, including regulatory bodies and industry, to ensure that the assays will fit with purposes of ED safety assessment. In this project review, we will briefly discuss the current state of the art in cellular assays of EDs and how our project aims at further advancing the field of cellular assays for EDs interfering with the thyroid gland.
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Warner M, Rauch S, Ames J, Mocarelli P, Brambilla P, Signorini S, Eskenazi B. Prenatal dioxin exposure and thyroid hormone levels in the Seveso second generation study. ENVIRONMENTAL RESEARCH 2020; 183:109280. [PMID: 32311913 PMCID: PMC7176740 DOI: 10.1016/j.envres.2020.109280] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Revised: 02/14/2020] [Accepted: 02/19/2020] [Indexed: 06/11/2023]
Abstract
BACKGROUND In animal studies, perinatal exposure to 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) alters thyroid homoeostasis and thyroid hormone concentrations; epidemiologic evidence is limited. OBJECTIVES We aimed to determine the association of prenatal exposure to TCDD with thyroid hormone concentrations in the Seveso Second Generation Study, a unique cohort of children born to TCDD-exposed women resulting from a 1976 chemical factory explosion in Seveso, Italy. METHODS We included 570 children (288 female, 282 male) with complete follow-up data, including a fasting blood draw. Serum levels of total and free thyroxine (T4), free triiodothyronine (T3), and thyroid stimulating hormone (TSH) were measured using immunoassays. We defined prenatal TCDD exposure as: 1) maternal initial TCDD concentration measured in serum collected soon after the explosion and 2) maternal TCDD estimated at pregnancy. RESULTS Compared to the lowest quartile (Q1), maternal initial serum TCDD was associated with lower free T3 (Q2: adj-β = -0.13, 95%CI -0.26, 0.00; Q3: adj-β = -0.22, 95%CI -0.35, -0.09; Q4: adj-β = -0.14, 95%CI -0.28, 0.00; p-trend = 0.02). In participants with high thyroid antibody status, inverse associations between maternal initial serum TCDD and free T3 were significantly stronger than in participants with normal antibody status (p-interaction = 0.02). We also observed a positive association between maternal initial serum TCDD and TSH concentrations in participants with high thyroid antibody status (Q2: adj-β = 11.4%, 95%CI -25.2, 66.1; Q3: adj-β = 49.0%, 95%CI 3.0, 115.5; Q4: adj-β = 105.5, 95%CI 36.6, 209.2; p-trend < 0.01) but not in those participants with normal antibody status (p-interaction < 0.01). Similar results were found for TCDD estimated at pregnancy. DISCUSSION Our results suggest prenatal exposure to TCDD, a potent endocrine-disrupting compound, may alter thyroid function later in life. Populations with additional thyroid stress may be particularly susceptible to in utero exposure of thyroid disrupting chemicals.
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Affiliation(s)
- Marcella Warner
- Center for Environmental Research and Children's Health (CERCH), School of Public Health, University of California at Berkeley, Berkeley, CA, USA.
| | - Stephen Rauch
- Center for Environmental Research and Children's Health (CERCH), School of Public Health, University of California at Berkeley, Berkeley, CA, USA
| | - Jennifer Ames
- Center for Environmental Research and Children's Health (CERCH), School of Public Health, University of California at Berkeley, Berkeley, CA, USA
| | - Paolo Mocarelli
- Department of Laboratory Medicine, University of Milano-Bicocca, School of Medicine, Hospital of Desio, Desio, Milano, Italy
| | - Paolo Brambilla
- Department of Laboratory Medicine, University of Milano-Bicocca, School of Medicine, Hospital of Desio, Desio, Milano, Italy
| | - Stefano Signorini
- Department of Laboratory Medicine, University of Milano-Bicocca, School of Medicine, Hospital of Desio, Desio, Milano, Italy
| | - Brenda Eskenazi
- Center for Environmental Research and Children's Health (CERCH), School of Public Health, University of California at Berkeley, Berkeley, CA, USA
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Genetic background and window of exposure contribute to thyroid dysfunction promoted by low-dose exposure to 2,3,7,8-tetrachlorodibenzo-p-dioxin in mice. Sci Rep 2018; 8:16324. [PMID: 30397221 PMCID: PMC6218492 DOI: 10.1038/s41598-018-34427-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2017] [Accepted: 09/24/2018] [Indexed: 01/02/2023] Open
Abstract
Genetic and environmental factors contribute to thyroid diseases. Although still debated, 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) is thought to induce thyroid dysfunction in humans and rodents. The data here reported point out the contribution of the exposure window and genetic background in mediating the low-dose TCDD effects on thyroid. Indeed, early (from E0.5 to PND30) and low-dose (0,001 μg/kg/day) TCDD exposure reduced the circulating fT4 and altered the expression of thyroid specific transcripts. The role of genetic components was estimated monitoring the same markers in Pax8+/- and Nkx2-1+/- mice, susceptible to thyroid dysfunction, exposed to 0, 1 μg/kg/day TCDD from E15.5 to PND60. Haploinsufficiency of either Pax8 or Nkx2-1 genes exacerbated the effects of the exposure impairing the thyroid enriched mRNAs in sex dependent manner. Such effect was mediated by mechanisms involving the Nkx2-1/p53/p65/IĸBα pathway in vitro and in vivo. Foetal exposure to TCDD impaired both thyroid function and genes expression while thyroid development and differentiation did not appear significantly affected. In mouse, stronger effects were related to earlier exposure or specific genetic background such as either Pax8 or Nkx2-1 haploinsufficiency, both associated to hypothyroidism in humans. Furthermore, our data underline that long exposure time are needed to model in vitro and in vivo results.
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Knutsen HK, Alexander J, Barregård L, Bignami M, Brüschweiler B, Ceccatelli S, Cottrill B, Dinovi M, Edler L, Grasl-Kraupp B, Hogstrand C, Nebbia CS, Oswald IP, Petersen A, Rose M, Roudot AC, Schwerdtle T, Vleminckx C, Vollmer G, Wallace H, Fürst P, Håkansson H, Halldorsson T, Lundebye AK, Pohjanvirta R, Rylander L, Smith A, van Loveren H, Waalkens-Berendsen I, Zeilmaker M, Binaglia M, Gómez Ruiz JÁ, Horváth Z, Christoph E, Ciccolallo L, Ramos Bordajandi L, Steinkellner H, Hoogenboom LR. Risk for animal and human health related to the presence of dioxins and dioxin-like PCBs in feed and food. EFSA J 2018; 16:e05333. [PMID: 32625737 PMCID: PMC7009407 DOI: 10.2903/j.efsa.2018.5333] [Citation(s) in RCA: 77] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The European Commission asked EFSA for a scientific opinion on the risks for animal and human health related to the presence of dioxins (PCDD/Fs) and DL-PCBs in feed and food. The data from experimental animal and epidemiological studies were reviewed and it was decided to base the human risk assessment on effects observed in humans and to use animal data as supportive evidence. The critical effect was on semen quality, following pre- and postnatal exposure. The critical study showed a NOAEL of 7.0 pg WHO2005-TEQ/g fat in blood sampled at age 9 years based on PCDD/F-TEQs. No association was observed when including DL-PCB-TEQs. Using toxicokinetic modelling and taking into account the exposure from breastfeeding and a twofold higher intake during childhood, it was estimated that daily exposure in adolescents and adults should be below 0.25 pg TEQ/kg bw/day. The CONTAM Panel established a TWI of 2 pg TEQ/kg bw/week. With occurrence and consumption data from European countries, the mean and P95 intake of total TEQ by Adolescents, Adults, Elderly and Very Elderly varied between, respectively, 2.1 to 10.5, and 5.3 to 30.4 pg TEQ/kg bw/week, implying a considerable exceedance of the TWI. Toddlers and Other Children showed a higher exposure than older age groups, but this was accounted for when deriving the TWI. Exposure to PCDD/F-TEQ only was on average 2.4- and 2.7-fold lower for mean and P95 exposure than for total TEQ. PCDD/Fs and DL-PCBs are transferred to milk and eggs, and accumulate in fatty tissues and liver. Transfer rates and bioconcentration factors were identified for various species. The CONTAM Panel was not able to identify reference values in most farm and companion animals with the exception of NOAELs for mink, chicken and some fish species. The estimated exposure from feed for these species does not imply a risk.
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May P, Bremond P, Sauzet C, Piccerelle P, Grimaldi F, Champion S, Villard PH. In Vitro Cocktail Effects of PCB-DL (PCB118) and Bulky PCB (PCB153) with BaP on Adipogenesis and on Expression of Genes Involved in the Establishment of a Pro-Inflammatory State. Int J Mol Sci 2018. [PMID: 29534036 PMCID: PMC5877702 DOI: 10.3390/ijms19030841] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
(1) Objective: Highlight the in vitro effects of 3T3-L1 cell exposure to polychlorinated biphenyls (PCB118 and 153) or benzo(a)pyrene (BaP) alone or as a cocktail on adipogenesis (ADG) by focusing on changes in lipid metabolism and inflammatory-related genes expression (INFG) and ADG-related genes expression (ADGG); (2) Results: Treatment from the early stage of cell differentiation by BaP alone or in combination with PCBs decreased the expression of some of the ADGG (PPARγGlut-4, FAS, Lipin-1a, Leptin, and Adiponectin). BaP enhanced the INFG, especially MCP-1 and TNFα. Co-exposure to BaP and PCB153 showed a synergistic effect on TNFα and IL6 expression. Treatment with BaP and PCBs during only the maturation period up-regulated the INFG (IL6, TNFα, CXCL-10 & MCP-1). PCB118 alone also enhanced TNFα, CXCL-10, and PAI-1 expression. The change in MCP-1 protein expression was in agreement with that of the gene. Finally, the BaP-induced up-regulation of the xenobiotic responsive element (XRE)-controlled luciferase activity was impaired by PCB153 but not by PCB118; (3) Conclusion: BaP and PCBs down-regulate a part of ADGG and enhance INFG. The direct regulatory effect of PCBs on both ADGG and INFG is usually rather lower than that of BaP and synergistic or antagonistic cocktail effects are clearly observed.
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Affiliation(s)
- Phealay May
- Aix Marseille Univ, Univ Avignon, CNRS, IRD, IMBE, Faculté de Pharmacie 27 Bd Jean Moulin, 13385 Marseille CEDEX 5, France.
| | - Patricia Bremond
- Aix Marseille Univ, Univ Avignon, CNRS, IRD, IMBE, Faculté de Pharmacie 27 Bd Jean Moulin, 13385 Marseille CEDEX 5, France.
| | - Christophe Sauzet
- Aix Marseille Univ, Univ Avignon, CNRS, IRD, IMBE, Faculté de Pharmacie 27 Bd Jean Moulin, 13385 Marseille CEDEX 5, France.
| | - Philippe Piccerelle
- Aix Marseille Univ, Univ Avignon, CNRS, IRD, IMBE, Faculté de Pharmacie 27 Bd Jean Moulin, 13385 Marseille CEDEX 5, France.
| | - Frédérique Grimaldi
- Aix Marseille Univ, Univ Avignon, CNRS, IRD, IMBE, Faculté de Pharmacie 27 Bd Jean Moulin, 13385 Marseille CEDEX 5, France.
| | - Serge Champion
- Aix Marseille Univ, Univ Avignon, CNRS, IRD, IMBE, Faculté de Pharmacie 27 Bd Jean Moulin, 13385 Marseille CEDEX 5, France.
| | - Pierre-Henri Villard
- Aix Marseille Univ, Univ Avignon, CNRS, IRD, IMBE, Faculté de Pharmacie 27 Bd Jean Moulin, 13385 Marseille CEDEX 5, France.
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Giuliani C, Iezzi M, Ciolli L, Hysi A, Bucci I, Di Santo S, Rossi C, Zucchelli M, Napolitano G. Resveratrol has anti-thyroid effects both in vitro and in vivo. Food Chem Toxicol 2017; 107:237-247. [PMID: 28668442 DOI: 10.1016/j.fct.2017.06.044] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Revised: 06/06/2017] [Accepted: 06/27/2017] [Indexed: 10/19/2022]
Abstract
Resveratrol is a natural polyphenol with antioxidant, anti-inflammatory, and antiproliferative properties. We have shown previously that resveratrol decreases sodium/iodide symporter expression and iodide uptake in thyrocytes, both in vitro and in vivo. In the present study, we further investigated the effects of resveratrol, with evaluation of the expression of additional thyroid-specific genes in the FRTL-5 rat thyroid cell line: thyroglobulin, thyroid peroxidase, TSH receptor, Nkx2-1, Foxe1 and Pax8. We observed decreased expression of these genes in FRTL-5 cells treated with 10 μM resveratrol. The effects of resveratrol was further evaluated in vivo using Sprague-Dawley rats treated with resveratrol 25 mg/kg body weight intraperitoneally, for 60 days. No clinical signs of hypothyroidism were seen, although the treated rats showed significant increase in thyroid size. Serum TSH and thyroid hormone levels were in the normal range, with significantly higher TSH seen in resveratrol-treated rats, compared with control rats. Histological and immunohistochemical analyses confirmed increased proliferative activity in the thyroid from resveratrol-treated rats. These data suggest that resveratrol acts as a thyroid disruptor and a goitrogen, which indicates the need for caution as a supplement and for therapeutic uses.
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Affiliation(s)
- Cesidio Giuliani
- Department of Medicine and Sciences of Aging, 'G. D'Annunzio' University of Chieti-Pescara, via dei Vestini, 66100 Chieti, Italy; Centre on Aging Science and Translational Medicine (CeSI-MeT), 'G. D'Annunzio' University of Chieti-Pescara, via dei Vestini, 66100 Chieti, Italy.
| | - Manuela Iezzi
- Department of Medicine and Sciences of Aging, 'G. D'Annunzio' University of Chieti-Pescara, via dei Vestini, 66100 Chieti, Italy; Centre on Aging Science and Translational Medicine (CeSI-MeT), 'G. D'Annunzio' University of Chieti-Pescara, via dei Vestini, 66100 Chieti, Italy.
| | - Laura Ciolli
- Department of Medicine and Sciences of Aging, 'G. D'Annunzio' University of Chieti-Pescara, via dei Vestini, 66100 Chieti, Italy; Centre on Aging Science and Translational Medicine (CeSI-MeT), 'G. D'Annunzio' University of Chieti-Pescara, via dei Vestini, 66100 Chieti, Italy.
| | - Alba Hysi
- Department of Medicine and Sciences of Aging, 'G. D'Annunzio' University of Chieti-Pescara, via dei Vestini, 66100 Chieti, Italy; Centre on Aging Science and Translational Medicine (CeSI-MeT), 'G. D'Annunzio' University of Chieti-Pescara, via dei Vestini, 66100 Chieti, Italy.
| | - Ines Bucci
- Department of Medicine and Sciences of Aging, 'G. D'Annunzio' University of Chieti-Pescara, via dei Vestini, 66100 Chieti, Italy; Centre on Aging Science and Translational Medicine (CeSI-MeT), 'G. D'Annunzio' University of Chieti-Pescara, via dei Vestini, 66100 Chieti, Italy.
| | - Serena Di Santo
- Department of Medicine and Sciences of Aging, 'G. D'Annunzio' University of Chieti-Pescara, via dei Vestini, 66100 Chieti, Italy; Centre on Aging Science and Translational Medicine (CeSI-MeT), 'G. D'Annunzio' University of Chieti-Pescara, via dei Vestini, 66100 Chieti, Italy.
| | - Cosmo Rossi
- Centre on Aging Science and Translational Medicine (CeSI-MeT), 'G. D'Annunzio' University of Chieti-Pescara, via dei Vestini, 66100 Chieti, Italy.
| | - Mirco Zucchelli
- Centre on Aging Science and Translational Medicine (CeSI-MeT), 'G. D'Annunzio' University of Chieti-Pescara, via dei Vestini, 66100 Chieti, Italy.
| | - Giorgio Napolitano
- Department of Medicine and Sciences of Aging, 'G. D'Annunzio' University of Chieti-Pescara, via dei Vestini, 66100 Chieti, Italy; Centre on Aging Science and Translational Medicine (CeSI-MeT), 'G. D'Annunzio' University of Chieti-Pescara, via dei Vestini, 66100 Chieti, Italy.
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Xu B, Yang H, Sun M, Chen H, Jiang L, Zheng X, Ding G, Liu Y, Sheng Y, Cui D, Duan Y. 2,3',4,4',5-Pentachlorobiphenyl Induces Inflammatory Responses in the Thyroid Through JNK and Aryl Hydrocarbon Receptor-Mediated Pathway. Toxicol Sci 2015; 149:300-11. [PMID: 26519956 DOI: 10.1093/toxsci/kfv235] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Polychlorinated biphenyls (PCBs) are durable and widely distributed environmental contaminants that can compromise the normal functions of multiple organs and systems; one important mechanism is the induction of inflammatory disorders. In this study, we explored the influences of 2,3',4,4',5-pentachlorobiphenyl (PCB118) on inflammatory responses and its underlying mechanisms in the thyroid. Wistar rats were administered PCB118 intraperitoneally at 0, 10, 100, and 1000 μg/kg/d, 5 days a week for 13 weeks; rat thyroid FRTL-5 cells were treated with PCB118 (0, 0.25, 2.5, and 25 nM) for indicated time. Results revealed that PCB118 promoted the generation of interleukin-6 (IL-6), tumor necrosis factor-α (TNF-α), and intercellular adhesion molecule-1 (ICAM-1) in a time- and dose-related manner and decreased sodium/iodide symporter (NIS) protein expression. Moreover, stimulation with PCB118 resulted in the upregulation of the aryl hydrocarbon receptor (AhR)-responsive gene cytochrome P450 1A1 in FRTL-5 cells; whereas pretreatment with the AhR inhibitor α-naphthoflavone or AhR small interfering RNA (siRNA) suppressed AhR, CYP1A1, IL-6, and ICAM-1 and restored NIS expression. In vivo and in vitro studies also suggested that the c-Jun N-terminal kinase (JNK) pathway was activated on PCB118 exposure, and the experiments using siRNA for JNK partially blocked PCB118-induced upregulation of IL-6 and ICAM-1 and downregulation of NIS. Altogether, PCB118 stimulates production of IL-6, TNF-α, and ICAM-1 in the thyroid through AhR and JNK activations and subsequently interferes with NIS expression, resulting in the disruption of thyroid structure and function.
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Affiliation(s)
- Bojin Xu
- *Department of Endocrinology and
| | - Hui Yang
- *Department of Endocrinology and
| | | | | | | | | | | | - Yun Liu
- Department of Gerontology, First Affiliated Hospital of Nanjing Medical University, Nanjing 210029, China
| | - Yunlu Sheng
- Department of Gerontology, First Affiliated Hospital of Nanjing Medical University, Nanjing 210029, China
| | - Dai Cui
- *Department of Endocrinology and
| | - Yu Duan
- *Department of Endocrinology and
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Yang H, Chen H, Guo H, Li W, Tang J, Xu B, Sun M, Ding G, Jiang L, Cui D, Zheng X, Duan Y. Molecular mechanisms of 2, 3', 4, 4', 5-pentachlorobiphenyl-induced thyroid dysfunction in FRTL-5 cells. PLoS One 2015; 10:e0120133. [PMID: 25789747 PMCID: PMC4366388 DOI: 10.1371/journal.pone.0120133] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2014] [Accepted: 01/19/2015] [Indexed: 12/02/2022] Open
Abstract
Polychlorinated biphenyls (PCBs) can severely interfere with multiple animals and human systems. To explore the molecular mechanisms underlying 2, 3′, 4, 4′, 5- pentachlorobiphenyl (PCB118)-induced thyroid dysfunction, Fischer rat thyroid cell line-5(FRTL-5) cells were treated with either different concentrations of PCB118 or dimethyl sulfoxide (DMSO). The effects of PCB118 on FRTL-5 cells viability and apoptosis were assessed by using a Cell Counting Kit-8 assay and apoptosis assays, respectively. Quantitative real-time polymerase chain reaction was used to quantify protein kinase B (Akt), Forkhead box protein O3a (FoxO3a), and sodium/iodide symporter (NIS) mRNA expression levels. Western blotting was used to detect Akt, phospho-Akt (p-Akt), FoxO3a, phospho-FoxO3a (p-FoxO3a), and NIS protein levels. Luciferase reporter gene technology was used to detect the transcriptional activities of FoxO3a and NIS promoters. The effects of the constitutively active Akt (CA-Akt) and dominant-negative Akt (DN-Akt) plasmids on p-Akt, p-FoxO3a, and NIS levels were examined in PCB118-treated FRTL-5 cells. The effects of FoxO3a siRNA on FoxO3a, p-FoxO3a, and NIS protein levels were examined in the PCB118-treated FRTL-5 cells. The effects of pcDNA3 (plsmid vectors designed for high-level stable and transient expression in mammalian host)-FoxO3a on NIS promoter activity were examined in the PCB118-treated FRTL-5 cells. Our results indicated that relatively higher PCB118 concentrations can inhibit cell viability in a concentration- and time-dependent manner. Akt, p-Akt, and p-FoxO3a protein or mRNA levels increased significantly in PCB118-treated groups and NIS protein and mRNA levels decreased considerably compared with the control groups. FoxO3a promoter activity increased significantly, whereas NIS promoter activity decreased. These effects on p-FoxO3a and NIS could be decreased by the DN-Akt plasmid, enhanced by the CA-Akt plasmid, and blocked by FoxO3a siRNA. The overexpressed FoxO3a could reduce NIS promoter activity. Our results suggested that PCB118 induces thyroid cell dysfunction through the Akt/FoxO3a/NIS signaling pathway.
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Affiliation(s)
- Hui Yang
- Department of Endocrinology, First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Huanhuan Chen
- Department of Endocrinology, First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Hongwei Guo
- Department of Endocrinology, First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Wen Li
- Department of Endocrinology, First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Jinmei Tang
- Department of Endocrinology, First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Bojin Xu
- Department of Endocrinology, First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Minne Sun
- Department of Endocrinology, First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Guoxian Ding
- Department of Gerontology, First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Lin Jiang
- Department of Endocrinology, First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Dai Cui
- Department of Endocrinology, First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Xuqin Zheng
- Department of Endocrinology, First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Yu Duan
- Department of Endocrinology, First Affiliated Hospital of Nanjing Medical University, Nanjing, China
- * E-mail:
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11
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Katarzyńska D, Hrabia A, Kowalik K, Sechman A. Comparison of the in vitro effects of TCDD, PCB 126 and PCB 153 on thyroid-restricted gene expression and thyroid hormone secretion by the chicken thyroid gland. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2015; 39:496-503. [PMID: 25682001 DOI: 10.1016/j.etap.2015.01.016] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2014] [Revised: 01/16/2015] [Accepted: 01/23/2015] [Indexed: 06/04/2023]
Abstract
The aim of this study was to compare the in vitro effects of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), 3,3',4,4',5-pentachlorobiphenyl (PCB 126; a coplanar PCB congener) and 2,2'4,4',5,5'-hexachlorobiphenyl (PCB153; non-coplanar PCB) on mRNA expression of thyroid-restricted genes, i.e. sodium iodide symporter (NIS), thyroid peroxidase (TPO) and thyroglobulin (TG), and thyroid hormone secretion from the thyroid gland of the laying chicken. Relative expression levels of NIS, TG and TPO genes and thyroxine (T4) and triiodothyronine (T3) secretion from the thyroidal explants were quantified by the real-time qPCR and RIA methods, respectively. In comparison with the control group, TCDD and PCB 126 significantly increased mRNA expression of TPO and TG genes. TCDD did not affect NIS mRNA levels, but PCB 126 decreased its expression. No effect of PCB 153 on the expression of these genes was observed. TCDD and PCB 126 significantly decreased T4 and T3 secretion. There was no significant effect of PCB 153 on these hormone secretions. In conclusion, the results obtained show that in comparison with non-coplanar PCB 153, TCDD and coplanar PCB 126 can directly affect thyroid hormone synthesis and secretion, and in consequence, they may disrupt the endocrine function of the thyroid gland of the laying chicken.
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Affiliation(s)
- Dorota Katarzyńska
- Department of Animal Physiology and Endocrinology, University of Agriculture in Krakow, Poland
| | - Anna Hrabia
- Department of Animal Physiology and Endocrinology, University of Agriculture in Krakow, Poland
| | - Kinga Kowalik
- Department of Animal Physiology and Endocrinology, University of Agriculture in Krakow, Poland
| | - Andrzej Sechman
- Department of Animal Physiology and Endocrinology, University of Agriculture in Krakow, Poland.
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12
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Guo H, Yang H, Chen H, Li W, Tang J, Cheng P, Xie Y, Liu Y, Ding G, Cui D, Zheng X, Duan Y. Molecular mechanisms of human thyrocyte dysfunction induced by low concentrations of polychlorinated biphenyl 118 through the Akt/FoxO3a/NIS pathway. J Appl Toxicol 2015; 35:992-8. [PMID: 25644787 DOI: 10.1002/jat.3032] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2014] [Revised: 05/05/2014] [Accepted: 05/05/2014] [Indexed: 11/07/2022]
Abstract
Polychlorinated biphenyls (PCBs) are typical persistent organic pollutants that can interfere with multiple organ systems of humans. Previously, we concluded that persistent exposure to low doses of PCB118 could severely damage the thyroidal structure, dramatically decrease the concentration of serum thyroid hormones and inhibit the pivotal gene expressions such as sodium/iodide symporter (NIS) and thyroglobulin (Tg). To explore the molecular mechanisms of thyrocyte dysfunction induced by 2,3',4,4',5-pentachlorobiphenyl (PCB118), monolayer cultured human thyroid epithelial cells (HTECs) were treated with PCB118 or dimethyl sulfoxide (DMSO) as a control. Our results indicated that relatively higher concentrations of PCB118 could induce a loss in the viability of HTEC. In cultures with concentrations of PCB118 from 0.025 to 25 nM, which did not affect cell viability or apoptosis, concentrations of Tg and thyroxine (T(4)) were significantly decreased compared with those in the controls. In addition, mRNA and protein levels of Akt were increased significantly in the PCB118-treated groups, whereas FoxO3a expression did not show particular variation. Furthermore, exposure to PCB118 was associated with a significant increase of the protein levels of p-Akt and p-FoxO3a, and these effects were blocked by LY294002. In contrast, mRNA and protein expression levels of NIS were decreased significantly, and this effect was blocked by LY294002. Unlike control cells, a cytoplasmic shift of FoxO3a was observed in the PCB118-treated group. Our research suggests that PCB118 may induce thyrocyte dysfunction through the Akt/FoxO3a/NIS signalling pathway, which provides potential new insights for finding interventions to counteract the damage to the human body caused by PCBs.
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Affiliation(s)
- Hongwei Guo
- Department of Endocrinology, First Affiliated Hospital of Nanjing Medical University, 210029, Nanjing, China
| | - Hui Yang
- Department of Endocrinology, First Affiliated Hospital of Nanjing Medical University, 210029, Nanjing, China
| | - Huanhuan Chen
- Department of Endocrinology, First Affiliated Hospital of Nanjing Medical University, 210029, Nanjing, China
| | - Wen Li
- Department of Endocrinology, First Affiliated Hospital of Nanjing Medical University, 210029, Nanjing, China
| | - Jinmei Tang
- Department of Endocrinology, First Affiliated Hospital of Nanjing Medical University, 210029, Nanjing, China
| | - Pei Cheng
- Department of Endocrinology, First Affiliated Hospital of Nanjing Medical University, 210029, Nanjing, China
| | - Yuchun Xie
- Department of Endocrinology, First Affiliated Hospital of Nanjing Medical University, 210029, Nanjing, China
| | - Yun Liu
- Department of Gerontology, First Affiliated Hospital of Nanjing Medical University, 210029, Nanjing, China
| | - Guoxian Ding
- Department of Gerontology, First Affiliated Hospital of Nanjing Medical University, 210029, Nanjing, China
| | - Dai Cui
- Department of Endocrinology, First Affiliated Hospital of Nanjing Medical University, 210029, Nanjing, China
| | - Xuqin Zheng
- Department of Endocrinology, First Affiliated Hospital of Nanjing Medical University, 210029, Nanjing, China
| | - Yu Duan
- Department of Endocrinology, First Affiliated Hospital of Nanjing Medical University, 210029, Nanjing, China
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13
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Kędzior M, Seredyński R, Godzik U, Tomczyk D, Gutowicz J, Terlecka E, Całkosiński I, Terlecki G. Inhibition of cathepsin B activity by 2,3,7,8-tetrachlorodibenzo-p-dioxin. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2015; 22:733-737. [PMID: 25163566 DOI: 10.1007/s11356-014-3482-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2014] [Accepted: 08/18/2014] [Indexed: 06/03/2023]
Abstract
2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD) is the most potent toxic isomer in the dioxin-like family. Due to its resistance to metabolic degradation, this ubiquitous environmental pollutant readily accumulates in multiple organs. Cathepsin B is a lysosomal cysteine protease playing an essential role in the intracellular protein turnover. Alterations in its expression, activity, and localization may facilitate the development of many pathologies, including cancer. TCDD, due to its extremely lipophilic nature, may diffuse through biological membranes and affect lysosomal enzymes, including cathepsins. Therefore, in this study we performed two enzymatic assays, spectrofluorimetry and gelatin zymography, in order to evaluate the effect of TCDD on purified bovine cathepsin B. We showed that the dioxin decreases the enzyme's activity in a dose-dependent manner. The reversibility of TCDD-induced inhibition of the protease was also examined, suggesting that TCDD does not bind covalently to the enzyme's active site, acting rather as a reversible inhibitor.
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Affiliation(s)
- Mateusz Kędzior
- Department of Physical Chemistry of Microorganisms, Institute of Genetics and Microbiology, University of Wrocław, Przybyszewskiego 63/77, 51-148, Wrocław, Poland
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14
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Saravanan M, Hur JH, Arul N, Ramesh M. Toxicological effects of clofibric acid and diclofenac on plasma thyroid hormones of an Indian major carp, Cirrhinus mrigala during short and long-term exposures. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2014; 38:948-958. [PMID: 25461555 DOI: 10.1016/j.etap.2014.10.013] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2014] [Revised: 10/16/2014] [Accepted: 10/18/2014] [Indexed: 06/04/2023]
Abstract
In the present investigation, the toxicity of most commonly detected pharmaceuticals in the aquatic environment namely clofibric acid (CA) and diclofenac (DCF) was investigated in an Indian major carp Cirrhinus mrigala. Fingerlings of C. mrigala were exposed to different concentrations (1, 10 and 100μgL(-1)) of CA and DCF for a period of 96h (short term) and 35 days (long term). The toxic effects of CA and DCF on thyroid hormones (THs) such as thyroid stimulating hormone (TSH), thyroxine (T4) and triiodothyronine (T3) levels were evaluated. During the short and long-term exposure period TSH level was found to be decreased at all concentrations of CA (except at the end of 14(th) day in 1 and 10μgL(-l) and 21(st) day in 1μgL(-l)) whereas in DCF exposed fish TSH level was found to be increased when compared to control groups. T4 level was found to be decreased at 1 and 100μgL(-l) of CA exposure at the end of 96h. However, T4 level was decreased at all concentrations of CA and DCF during long-term (35 days) exposure period. Fish exposed to all concentrations of CA and DCF had lower level of T3 in both the treatments. These results suggest that both CA and DCF drugs induced significant changes (P<0.01 and P<0.05) on thyroid hormonal levels of C. mrigala. The alterations of these hormonal levels can be used as potential biomarkers in monitoring of pharmaceutical drugs in aquatic organisms.
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Affiliation(s)
- Manoharan Saravanan
- Unit of Toxicology, Department of Zoology, School of Life Sciences, Bharathiar University, Coimbatore 641 046, Tamil Nadu, India; Bio-Regulatory Chemistry Lab, Department of Biological Environment, College of Agriculture and Life Sciences, Kangwon National University, Chuncheon 200-701, Republic of Korea
| | - Jang-Hyun Hur
- Bio-Regulatory Chemistry Lab, Department of Biological Environment, College of Agriculture and Life Sciences, Kangwon National University, Chuncheon 200-701, Republic of Korea
| | - Narayanasamy Arul
- Department of Life Science, Research Center for Cell Homeostasis, Ewha Womens University, Seoul 120-750, Republic of Korea
| | - Mathan Ramesh
- Unit of Toxicology, Department of Zoology, School of Life Sciences, Bharathiar University, Coimbatore 641 046, Tamil Nadu, India.
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15
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Feng S, Cao Z, Wang X. Role of aryl hydrocarbon receptor in cancer. Biochim Biophys Acta Rev Cancer 2013; 1836:197-210. [PMID: 23711559 DOI: 10.1016/j.bbcan.2013.05.001] [Citation(s) in RCA: 95] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2013] [Revised: 05/14/2013] [Accepted: 05/17/2013] [Indexed: 01/01/2023]
Abstract
Aryl hydrocarbon receptor (AHR), a cytosolic ligand-activated transcription factor, belongs to the member of bHLH/PAS family of heterodimeric transcriptional regulators and is widely expressed in a variety of animal species and humans. Recent animal and human data suggested that AHR is involved in various signaling pathways critical to cell normal homeostasis, which covers multiple aspects of physiology, such as cell proliferation and differentiation, gene regulation, cell motility and migration, inflammation and others. Dysregulation of these physiological processes is known to contribute to events such as tumor initiation, promotion, and progression. Increasing epidemiological and experimental animal data provided substantial support for an association between abnormal AHR function and cancer, implicating AHR may be a novel drug-interfering target for cancers. The proposed underlying mechanisms of its actions in cancer involved multiple aspects, (a) inhibiting the functional expression of the key anti-oncogenes (such as p53 and BRCA1), (b) promoting stem cells transforming and angiogenesis, (c) altering cell survival, proliferation and differentiation by influencing the physiologic processes of cell-cycle, apoptosis, cell contact-inhibition, metabolism and remodel of extracellular matrix, and cell-matrix interaction, (d) cross-talking with the signaling pathways of estrogen receptor and inflammation. This review aims to provide a brief overview of recent investigations into the role of AHR and the underlying mechanisms of its actions in cancer, which were explored by the new technologies emerging in recent years.
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Affiliation(s)
- Shaolong Feng
- The School of Public Health, University of South China, Hengyang 421001, China.
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16
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Hombach-Klonisch S, Danescu A, Begum F, Amezaga MR, Rhind SM, Sharpe RM, Evans NP, Bellingham M, Cotinot C, Mandon-Pepin B, Fowler PA, Klonisch T. Peri-conceptional changes in maternal exposure to sewage sludge chemicals disturbs fetal thyroid gland development in sheep. Mol Cell Endocrinol 2013; 367:98-108. [PMID: 23291342 PMCID: PMC3581773 DOI: 10.1016/j.mce.2012.12.022] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/23/2012] [Revised: 11/14/2012] [Accepted: 12/13/2012] [Indexed: 11/24/2022]
Abstract
Ewes were exposed to sewage sludge-fertilized pastures in a study designed investigate pre-conceptual and/or gestational exposure to environmental chemicals. The in utero impact on fetal thyroid morphology and function at day 110 (of 145) of pregnancy was then determined. Pre-conceptual exposure increased the relative thyroid organ weights in male fetuses. The number of thyroid follicles in thyroids of fetuses after pre-conceptual or gestational exposure was reduced. This correlated with an increase in Ki67 positive cells. Pre-conceptual exposure to sewage sludge reduced small blood vessels in fetal thyroids. Thyroid tissues of exposed fetuses contained regions where mature angio-follicular units were reduced exhibiting decreased immunostaining for sodium-iodide symporter (NIS). Fetal plasma levels of fT3 and fT4 in exposed animals, however, were not different from controls suggesting compensatory changes in the thyroid gland to maintain homeostasis in exposed fetuses. The regional aberrations in thyroid morphology may impact on the post-natal life of the exposed offspring.
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Key Words
- ecs, environmental chemicals
- edcs, endocrine-disrupting compounds
- nis, sodium-iodide symporter
- ft3, free triiodothyronine
- ft4, free thyroxine
- th, thyroid hormone
- tsh, thyroid stimulating hormone
- tr, thyroid hormone receptor
- ttr, transthyretin
- hpt, hypothalamic-pituitary-thyroid axis
- pcbs, polychlorinated biphenyls
- pbde, polybrominated diphenyl ether
- dehp, di(2-ethylhexyl) phthalate
- cv, coefficient of variation
- dab, 3,3′-diaminobenzidine tetrahydrochloride
- hrp, horseradish peroxidase
- rt, room temperature
- he, hematoxylin-eosin
- gnrh, gonadotropin releasing hormone
- gd, gestational day
- tunel, terminal deoxynucleotidyl transferase dutp nick end labeling
- endocrine disruptors
- thyroid gland
- sheep
- fetal
- sewage sludge
- development
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Affiliation(s)
- Sabine Hombach-Klonisch
- Department of Human Anatomy & Cell Science, University of Manitoba, Winnipeg, Manitoba, Canada.
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17
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Jablonska O, Ciereszko RE. The Expression of Aryl Hydrocarbon Receptor in Porcine Ovarian Cells. Reprod Domest Anim 2013; 48:710-6. [DOI: 10.1111/rda.12145] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2012] [Accepted: 12/28/2012] [Indexed: 11/27/2022]
Affiliation(s)
- O Jablonska
- Department of Animal Physiology; University of Warmia and Mazury in Olsztyn; Olsztyn; Poland
| | - RE Ciereszko
- Department of Animal Physiology; University of Warmia and Mazury in Olsztyn; Olsztyn; Poland
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18
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Maity S, Jannasch A, Adamec J, Watkins JM, Nalepa T, Höök TO, Sepúlveda MS. Elucidating causes of Diporeia decline in the Great Lakes via metabolomics: physiological responses after exposure to different stressors. Physiol Biochem Zool 2013; 86:213-23. [PMID: 23434781 DOI: 10.1086/669132] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
The benthic macroinvertebrate Diporeia spp. have been extirpated from many areas of the Laurentian Great Lakes, but the mechanisms underlying such declines are not fully understood. Diporeia declines coinciding with the invasion of exotic dreissenid mussels (zebra and quagga) have led to the hypothesis that Diporeia declines are a result of decreased food availability from increasing competition with dreissenids for diatoms. There is additional evidence that Diporeia are negatively affected when in close proximity to dreissenids, probably because of exposure to toxins present in the mussels' pseudofeces. Diporeia are also known to be sensitive to anthropogenic contaminants (such as polychlorinated biphenyls [PCBs]) present in Great Lakes sediments. To better understand the physiological responses of Diporeia to diverse stressors, we conducted three 28-d experiments evaluating changes in the metabolomes of Diporeia (1) fed diatoms (Cyclotella meneghiniana) versus starved, (2) exposed (from Lake Michigan and Cayuga Lake) to quagga mussels (Dreissena bugensis), and (3) exposed to sediments contaminated with PCBs. The metabolomes of samples were examined using both two-dimensional gas and liquid chromatography coupled with mass spectrometry. Each stressor elicited a unique metabolome response characterized by enhanced citric acid cycle, fatty acid biosynthesis, and protein metabolism in diatom-fed Diporeia; impaired glycolysis, protein catabolism, and folate metabolism in Diporeia from Lake Michigan irrespective of quagga mussel exposure, suggesting lake-specific adaptation mechanisms; and altered cysteine and phospholipid metabolism during PCB exposure. Subsequent comparisons of these stressor-specific metabolic responses with metabolomes of a feral Diporeia population would help identify stressors affecting Diporeia populations throughout the Great Lakes.
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Affiliation(s)
- Suman Maity
- Department of Forestry and Natural Resources, Purdue University, 195 Marsteller Street, West Lafayette, IN 47907, USA.
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Ishikawa T, Okinaga H, Takahashi S, Numakura M, Mashimo Y, Yoshimura N, Maeda T, Inoue D, Okazaki R, Kinoshita M, Jameson JL, Teramoto T. Serum from methimazole-treated patients induces activation of aryl hydrocarbon receptor, a transcription factor that binds to dioxin-response elements. Thyroid 2012; 22:769-77. [PMID: 22784254 DOI: 10.1089/thy.2012.0057] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
BACKGROUND The aryl hydrocarbon receptor (AhR) is a transcription factor that is activated by xenobiotic substances such as dioxin. After activation, it binds to dioxin response elements of DNA, thereby inducing transcription of a variety of xenobiotic metabolizing enzymes. To investigate whether AhR-activating substances accumulate in patients with endocrine disorders, we tested serum samples for AhR-stimulating activity. METHODS Serum AhR-stimulating activity was evaluated by exposing the HepG2 cells transiently transfected with an AhR-responsive reporter plasmid to serum samples. On the basis of preliminary findings that implicated methimazole (MMI), wild-type and AhR-null mice were treated with MMI, and their plasma AhR-stimulating activities and thyroxine levels were quantified. RESULTS In 28 randomly chosen patients, 7 out of 10 Graves' disease patients exhibited increased serum AhR-stimulating activity. The increased activity did not correlate with thyroid hormone status. However, we hypothesized that it might be caused by MMI. Subsequent analyses revealed that in 25 of 26 MMI-treated Graves' patients, serum samples collected after the MMI treatment had significantly higher AhR-stimulating activity compared to samples obtained when the same patients were not on MMI. By contrast, serum AhR-stimulating activity was unchanged in samples from the seven patients on propylthiouracil (PTU) compared to serum taken before the PTU treatment. In vitro experiments demonstrated that an MMI metabolite 3-methyl-2-thiohydantoin, but not MMI, activated AhR. MMI increased plasma AhR-stimulating activities and reduced plasma thyroxine concentrations, in both wild-type and AhR-deficient mice. CONCLUSIONS Graves' patients taking MMI have increased serum AhR-stimulating activity, which is unrelated to thyroid hormone status, but correlates with MMI treatment. The AhR activation is likely caused by 3-methyl-2-thiohydantoin. Further studies are required to determine the potency of 3-methyl-2-thiohydantoin as an AhR activator and the significance of the differences between MMI and PTU observed in this study.
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Affiliation(s)
- Toshio Ishikawa
- Department of Internal Medicine, Teikyo University School of Medicine, Tokyo, Japan.
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20
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Spaulding SW. The possible roles of environmental factors and the aryl hydrocarbon receptor in the prevalence of thyroid diseases in Vietnam era veterans. Curr Opin Endocrinol Diabetes Obes 2011; 18:315-20. [PMID: 21825977 DOI: 10.1097/med.0b013e32834a8764] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
PURPOSE OF REVIEW 2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD) profoundly affects the immune system in experimental animals. TCDD was a contaminant in defoliants used in the Vietnam War, and is known to cause prolonged activation of the aryl hydrocarbon receptor (AhR) in humans. Chronic exposure to TCDD is associated with an increased prevalence of certain chronic diseases, lymphomas and leukemias. The AhR is a transcription factor that responds to cellular metabolites as well as to environmental substances. We review how TCDD and the AhR alter thyroid metabolism directly, and how recent experimental and clinical findings on TCDD and immunity are related to autoimmune thyroid diseases. RECENT FINDINGS TCDD exaggerates the normal responses of the AhR to endogenous activators, affecting dendritic cells, regulatory T cells (T(reg)), T(helper)17 (T(h)17) and T(helper)22 (T(h)22) cells. A recent study on approximately 225 000 veterans of the Vietnam era found that those who served in Vietnam or were otherwise exposed to defoliants had a 2.5-fold to three-fold higher prevalence of the diagnosis of Graves' disease, compared to Veterans who served elsewhere. SUMMARY The balance between T(reg), T(h)17 and T(h)22 cells is disrupted by TCDD, resembling what has been found clinically in Graves' disease and Hashimoto's thyroiditis, and in animal models of these diseases. By altering the immune balance in susceptible individuals, chronic TCDD exposure may influence the prevalence of autoimmune thyroid diseases.
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21
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Langer P. The impacts of organochlorines and other persistent pollutants on thyroid and metabolic health. Front Neuroendocrinol 2010; 31:497-518. [PMID: 20797403 DOI: 10.1016/j.yfrne.2010.08.001] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/29/2010] [Revised: 08/12/2010] [Accepted: 08/19/2010] [Indexed: 12/24/2022]
Abstract
High prevalence of thyroid and metabolic disorders has been repeatedly observed in the population living in the area of eastern Slovakia highly polluted by a mixture of PCBs, DDE and HCB since about 50 years ago. Among thyroid disorders, increase of thyroid volume as measured by ultrasound volumetry may be suggested as one of notable findings which appeared possibly related to increased OCs levels and to autoimmunity signs (e.g. positive thyroperoxidase antibodies in blood and/or hypoechogenicity image obtained by ultrasound), while some participation of individual susceptibility and also of immunogenic effect of OCs and iodine in this iodine replete country cannot be excluded. Another notable finding has been the increase of blood FT4 and TT3 positively related to high PCBs level. Such increased FT4 level has been found associated with TSH level in hyperthyroid range in about 2% of examined population from polluted area. High prevalence of thyroid autoimmune disorders strongly supported the assumption on impaired immune system and thus also on presumably increased prevalence of other autoimmune disorders in highly exposed population. In addition, markedly increased prevalence of prediabetes and diabetes significantly related to major OCs (PCBs, DDE and HCB) levels and accompanied by increasing level of cholesterol and triglycerides has been observed. The observations also suggested a role of prenatal exposure to OCs in the development of several adverse health signs (e.g. increased prevalence of thyroid antibodies, impaired fasting glucose level, increased thyroid volume, decreased thymus volume, decreased neurobehavioral performance, increased hearing and dental disorders) in young generation born to highly exposed mothers in polluted area.
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Affiliation(s)
- Pavel Langer
- Slovak Academy of Sciences, Bratislava, Slovakia.
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22
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Han DY, Kang SR, Park OS, Cho JH, Won CK, Park HS, Park KI, Kim EH, Kim GS. Polychlorinated biphenyls have inhibitory effect on testicular steroidogenesis by downregulation of P45017α and P450scc. Toxicol Ind Health 2010; 26:287-96. [DOI: 10.1177/0748233710364961] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Polychlorinated biphenyls (PCBs) are environmental pollutants that are quite toxic to biological systems. This study examined the inhibitory effect of PCB126 and PCB114 on testicular steroidogenesis in male rats. Male Sprague Dawley rats received weekly intraperitoneal injections of PCB126 (0.2 mg/kg) or PCB114 (20 mg/kg) or vehicle (corn oil). Animals from each group were sacrificed at 2, 5 and 8 weeks after the injections. Blood and testis tissue samples were collected for the hormone assay, Western blotting and reverse transcriptase polymerase chain reaction (RT-PCR). The testosterone, luteinizing hormone (LH) and follicle-stimulating hormone (FSH) levels were assayed, and the expression levels of the mRNA and proteins associated with the testosterone biosynthesis pathway were measured to determine the effect of PCB126 and PCB114 on testicular steroidogenesis. The results showed that the testis weight was significantly higher in the PCB126-treated rats given eight shots. Moreover, the serum testosterone levels were significantly lower in the PCB126 and PCB114-treated groups than the control. The transcription and translation levels of P45017α and P450scc were significantly lower in the PCB126-treated groups than the control. These results suggest that PCB126 may affect testicular steroidogenesis by downregulating P45017α, P450 scc and have inhibitory effect on the testicular functions.
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Affiliation(s)
- Dae-Yong Han
- Research Institute of Life Science and College of Veterinary Medicine, Gyeongsang National University, Jinju, Korea
| | - Sang-Rim Kang
- Research Institute of Life Science and College of Veterinary Medicine, Gyeongsang National University, Jinju, Korea
| | - Oh-Sung Park
- Research Institute of Life Science and College of Veterinary Medicine, Gyeongsang National University, Jinju, Korea
| | - Jae-Hyeon Cho
- Research Institute of Life Science and College of Veterinary Medicine, Gyeongsang National University, Jinju, Korea
| | - Chung-Kil Won
- Research Institute of Life Science and College of Veterinary Medicine, Gyeongsang National University, Jinju, Korea
| | - Hyeon-Soo Park
- Research Institute of Life Science and College of Veterinary Medicine, Gyeongsang National University, Jinju, Korea
| | - Kwang-Il Park
- Research Institute of Life Science and College of Veterinary Medicine, Gyeongsang National University, Jinju, Korea
| | - Eun-Hee Kim
- Department of Physical Therapy, International University of Korea, Jinju, Korea
| | - Gon-Sup Kim
- Research Institute of Life Science and College of Veterinary Medicine, Gyeongsang National University, Jinju, Korea,
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23
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Brar NK, Waggoner C, Reyes JA, Fairey R, Kelley KM. Evidence for thyroid endocrine disruption in wild fish in San Francisco Bay, California, USA. Relationships to contaminant exposures. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2010; 96:203-215. [PMID: 19939474 DOI: 10.1016/j.aquatox.2009.10.023] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2009] [Revised: 10/02/2009] [Accepted: 10/28/2009] [Indexed: 05/28/2023]
Abstract
It is well documented that many coastal and estuarine environments adjacent to developed and industrialized urban centers, such as the San Francisco Bay Area, are significantly contaminated by anthropogenic chemicals. However, it is not well understood to what extent existing contaminants, many with continuing inflows into the environment, may impact exposed wildlife. This study provided an initial characterization of thyroid endocrine-related effects and their relationship to accumulated contaminants in two indigenous fish species sampled from different San Franicsco Bay Area study sites. Plasma concentrations of thyroxine (T4) were significantly reduced in fish sampled from highly impacted locations such as Oakland Inner Harbor and San Leandro Bay as compared with fish from other locations representing relatively lower human impact, including Bodega Bay, Redwood City and a remote site on Santa Catalina Island. Triiodothyronine (T3) levels also varied significantly by location, with differing T3/T4 ratios in fish from some locations suggestive of altered peripheral deiodinase activity. The changes in thyroid endocrine parameters were significantly correlated with hepatic concentrations of certain environmental contaminants. A large number of polychlorinated biphenyl (PCB) congeners, both co-planar (dioxin-like) and non-co-planar, exhibited significant inverse correlations with T4 levels in the fish, while in contrast, T3 and T3/T4 ratio were positively correlated with PCB exposures. The positive correlation between T3/T4 ratio and PCBs supports the hypothesis that environmental PCBs may alter T4 deiodination or turnover, actions of PCBs reported in laboratory experiments. Some relationships between chlorinated pesticides including DDT and chlordanes, but fewer relationships with PAHs, were also observed. Together, these findings indicate that the thyroid endocrine system is exhibiting alterations associated with different aquatic environments in the San Francisco Bay Area, which are significantly related to current-day exposures of the fish to contaminant chemicals such as PCBs.
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Affiliation(s)
- Navdeep K Brar
- Department of Biological Sciences, California State University, Long Beach, 90840, USA
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24
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Han DY, Kang SR, Park OS, Cho JH, Won CK, Park HS, Park KI, Kim EH, Kim GS. Hypothyroidism induced by polychlorinated biphenyls and up-regulation of transthyretin. BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2010; 84:66-70. [PMID: 19806282 DOI: 10.1007/s00128-009-9890-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2009] [Accepted: 09/24/2009] [Indexed: 05/28/2023]
Abstract
Polychlorinated biphenyls are environmental pollutants that are toxic to many biological systems. This study examined whether or not PCB126 and PCB114 have adverse effects on the serum thyroxine level and the serum proteome in rats. The results showed a lower serum total thyroxine level in the PCB126 and PCB114-treated groups than the control. Western blotting showed that the levels of transthyretin expression were significantly higher in the PCB-treated group than the control group. These results suggest that the PCB-mediated hypothyroidism is caused by the displacement of thyroxine from transthyretin.
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Affiliation(s)
- Dae-Yong Han
- Research Institute of Life Science, Gyeongsang National University, Jinju, 660-701, Korea
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25
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Monostory K, Pascussi JM, Kóbori L, Dvorak Z. Hormonal regulation of CYP1A expression. Drug Metab Rev 2009; 41:547-72. [DOI: 10.1080/03602530903112284] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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26
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Kung T, Murphy KA, White LA. The aryl hydrocarbon receptor (AhR) pathway as a regulatory pathway for cell adhesion and matrix metabolism. Biochem Pharmacol 2008; 77:536-46. [PMID: 18940186 DOI: 10.1016/j.bcp.2008.09.031] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2008] [Revised: 09/17/2008] [Accepted: 09/19/2008] [Indexed: 01/07/2023]
Abstract
The aryl hydrocarbon receptor (AhR) is an orphan receptor in the basic helix-loop-helix PAS family of transcriptional regulators. Although the endogenous regulator of this pathway has not been identified, the AhR is known to bind and be activated by a variety of compounds ranging from environmental contaminants to flavanoids. The function of this receptor is still unclear; however, animal models indicate that the AhR is important for normal development. One hypothesis is that the AhR senses cellular stress and initiates the cellular response by altering gene expression and inhibiting cell cycle progression and that activation of the AhR by exogenous environmental chemicals results in the dysregulation of this normal function. In this review we will examine the role of the AhR in the regulation of genes and proteins involved in cell adhesion and matrix remodeling, and discuss the implications of these changes in development and disease. In addition, we will discuss evidence suggesting that the AhR pathway is responsive to changes in matrix composition as well as cell-cell and cell-matrix interactions.
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Affiliation(s)
- Tiffany Kung
- Department of Biochemistry and Microbiology, Rutgers, The State University of NJ, New Brunswick, NJ 08901, USA
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27
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Bal-Price AK, Suñol C, Weiss DG, van Vliet E, Westerink RH, Costa LG. Application of in vitro neurotoxicity testing for regulatory purposes: Symposium III summary and research needs. Neurotoxicology 2008; 29:520-31. [DOI: 10.1016/j.neuro.2008.02.008] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2007] [Revised: 02/14/2008] [Accepted: 02/14/2008] [Indexed: 01/14/2023]
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28
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Kim JH, In YJ, Kim WK, Bae KH, Kang S, Lee SC. Differential signatures of protein glycosylation and phosphorylation in human Chang liver cells induced by TCDD treatment. Toxicol Lett 2008; 178:20-8. [DOI: 10.1016/j.toxlet.2008.01.019] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2007] [Revised: 01/28/2008] [Accepted: 01/28/2008] [Indexed: 10/22/2022]
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29
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Rádiková Z, Tajtáková M, Kocan A, Trnovec T, Seböková E, Klimes I, Langer P. Possible effects of environmental nitrates and toxic organochlorines on human thyroid in highly polluted areas in Slovakia. Thyroid 2008; 18:353-62. [PMID: 18298316 DOI: 10.1089/thy.2007.0182] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Heavy environmental pollution resulting from uncontrolled industrial and agricultural activities has occurred in several areas of Slovakia. So far, field surveys focused mainly on the thyroid have been conducted in one area polluted by nitrates and in a large area polluted mainly by organochlorinated toxicants. In children from the high nitrate area (HNA, n = 324) significantly higher thyroid volume (ThV) by ultrasound was found compared with age-matched children from surrounding areas with low nitrate (LNA, n = 764). In blood samples of 324 children from the HNA and of 100 children from the LNA no difference between areas was found in the level of total thyroxine (T4) and free triiodothyronine (T3). However, positive thyroid peroxidase antibodies (TPOAb) were found in 7/324 (2.2%) and thyrotropin (TSH) levels > 4.0 mIU/L in 13/324 (4.0%) of children from the HNA area, while no positive values were obtained in the LNA. In the area heavily polluted by an organochlorine (OC) cocktail consisting of polychlorinated biphenyls (PCBs), 2,2'-bis(4-chlorophenyl)-1,1-dichloroethylene (p,p'-DDE), hexachlorobenzene (HCB), and dioxins and furans (polluted area) and in the background pollution area (background area) a total of 2046 adults were examined. In polluted area very high blood levels of OCs were found as well as increased ThV and prevalence of thyroid hypoechogenicity by ultrasound. For the evaluation of data the level of PCBs was used as a marker of all OCs. Increasing PCB levels were significantly associated with the increase of free T4 (p < 0.001) and total T3 (p < 0.05) in blood, while slight but not significant negative association of PCBs was observed with the level of TSH. In both women and men the prevalence of TPOAb was significantly higher in polluted area. Although the absolute TPOAb prevalence in both areas was higher in women than that in men, the increase in polluted vs. background area was more striking in men. From these data it appears that the effects of environmental pollution on the thyroid cannot be neglected.
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Affiliation(s)
- Zofia Rádiková
- Institute of Experimental Endocrinology, Slovak Academy of Sciences, Bratislava, Slovakia.
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30
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Langer P, Tajtáková M, Kocan A, Petrík J, Koska J, Ksinantová L, Rádiková Z, Ukropec J, Imrich R, Hucková M, Chovancová J, Drobná B, Jursa S, Vlcek M, Bergman A, Athanasiadou M, Hovander L, Shishiba Y, Trnovec T, Seböková E, Klimes I. Thyroid ultrasound volume, structure and function after long-term high exposure of large population to polychlorinated biphenyls, pesticides and dioxin. CHEMOSPHERE 2007; 69:118-27. [PMID: 17537484 DOI: 10.1016/j.chemosphere.2007.04.039] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2006] [Revised: 03/12/2007] [Accepted: 04/13/2007] [Indexed: 05/15/2023]
Abstract
We examined 2,046 adults (834 males and 1,212 females aged 20-75 years) from polluted district in East Slovakia (POLL) and two neighboring upstream and upwind located districts of background pollution (BCGR). By ultrasound we estimated the thyroid volume (ThV), hypoechogenicity (HYE), nodules and cysts. Serum levels of thyrotropin (TSH), thyroperoxidase antibodies (TPOab) and thyroglobulin were estimated by electrochemiluminiscent assay and these of 15 PCB congeners, p,p'-DDE, p,p'-DDT, hexachlorobenzene (HCB) and hexachlorocyclohexane by high-resolution gas chromatography. In 320 subjects also selected hydroxylated and methylsulfonated PCB metabolites, polychlorinated dibenzo-dioxins (PCDDs), -furans (PCDFs), five dioxin-like coplanar and eight mono-ortho PCB congeners were estimated. Urinary iodine was measured by automatic microplate method. Reciprocal positive association was found between three major POPs (PCBs, DDE and HCB), the levels of these and also PCDDs plus PCDFs in polluted area being considerably higher than in background pollution area. ThV in groups of males and females from POLL with high PCBs level was significantly higher (p<0.001 by t-test) then in age and sex matched groups from BCGR with low PCBs level. In 1,048 males and females aged <60 years with serum PCBs level >1,000 ng g(-1) lipid (median=1,756 ng g(-1)) a significant effect of age on ThV was found (p<0.01 by ANOVA), while in 921 respective subjects with PCBs level <1,000 ng g(-1) (median=661 ng g(-1)) it was not. These findings supported the view on the additional effect of PCBs on ThV other than that of age. Since the urinary iodine in both districts showed optimal range, any interfering effect of unsatisfactory iodine intake on ThV may be excluded. The frequency of autoimmune thyroiditis signs such as HYE, increased serum level of TPOab and TSH resulting in subclinical or overt thyroid hypofunction was positively associated with sex, age and organochlorine levels. The increase of such frequency in males with POPs levels was much more abrupt than that in females. No considerable differences in the frequency of thyroid nodules as related to PCBs level were found.
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Affiliation(s)
- Pavel Langer
- Institute of Experimental Endocrinology, Slovak Academy of Sciences, Vlárska 3, 833 06 Bratislava, Slovakia.
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31
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Costa LG, Fattori V, Giordano G, Vitalone A. An in vitro approach to assess the toxicity of certain food contaminants: Methylmercury and polychlorinated biphenyls. Toxicology 2007; 237:65-76. [PMID: 17553607 DOI: 10.1016/j.tox.2007.05.003] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2007] [Revised: 04/24/2007] [Accepted: 05/01/2007] [Indexed: 12/27/2022]
Abstract
Methylmercury (MeHg) and polychlorinated biphenyls (PCBs) are widespread environmental pollutants and food contaminants, and known developmental neurotoxicants. Aim of this study was to evaluate the effects of MeHg, PCB 126 and PCB 153 in a battery of in vitro cell systems. A total of 17 cell types were utilized, including nervous system (neuronal and astroglial) and non-nervous system cells. End-points measured included MTT reduction, Trypan blue exclusion and (3)H-thymidine incorporation into DNA. Results indicate that this approach would identify these three compounds as neurotoxicants, and would also point out to the thyroid (for PCB 126 and MeHg) and the prostate (for both PCBs) as important additional targets. Tests of binary combinations of MeHg and PCBs indicated no interaction and an additive response, in agreement with other recent reports. Cerebellar granule neurons from mice with genetically determined low glutathione levels were more sensitive than wild-type neurons to the toxicity of all three compounds, supporting a role for oxidative stress in their neurotoxicity. These findings provide initial evidence that a relatively rapid in vitro screening approach can be developed, that would provide initial information useful for assessing neurotoxicity, as well as indication on potential other targets of biological action or toxicity.
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Affiliation(s)
- Lucio G Costa
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, USA; Department of Human Anatomy, Pharmacology and Forensic Sciences, University of Parma Medical School, Parma, Italy.
| | - Vittorio Fattori
- Department of Pharmacology and Human Physiology, University of Bari Medical School, Bari, Italy
| | - Gennaro Giordano
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, USA
| | - Annabella Vitalone
- Department of Human Anatomy, Pharmacology and Forensic Sciences, University of Parma Medical School, Parma, Italy
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