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Xu Y, Sun MH, Xu Y, Ju JQ, Pan MH, Pan ZN, Li XH, Sun SC. Nonylphenol exposure affects mouse oocyte quality by inducing spindle defects and mitochondria dysfunction. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 266:114967. [PMID: 32645552 DOI: 10.1016/j.envpol.2020.114967] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2020] [Revised: 05/20/2020] [Accepted: 06/03/2020] [Indexed: 06/11/2023]
Abstract
Nonylphenol (NP) is a chemical raw material and intermediate which is mainly used in the production of surfactants, lubricating oil additives and pesticide emulsifiers. NP is reported to be toxic on the immune system, nervous system and reproductive system due to its binding to estrogen receptors. However, the toxicity of NP on mammalian oocyte quality remains unclear. In present study, we explored the effects of NP exposure on mouse oocyte maturation. Our results showed that 4 weeks of NP exposure increased the number of atresia follicles and decreased oocyte developmental competence. Transcriptomic analysis indicated that NP exposure altered the expression of more than 800 genes in oocytes, including multiple biological pathways. Subcellular structure examination indicated that NP exposure disrupted meiotic spindle organization and caused chromosome misalignment. Moreover, aberrant mitochondrial distribution and decreased membrane potential were also observed, indicating that NP exposure caused mitochondria dysfunction. Further analysis showed that NP exposure resulted in the accumulation of reactive oxygen species (ROS), which causes oxidative stress; and the NP-exposed oocytes showed positive Annexin-V signal, indicating the occurrence of early apoptosis. In summary, our results indicated that NP exposure reduced oocyte quality by affecting cytoskeletal dynamics and mitochondrial function, which further induced oxidative stress and apoptosis in mice.
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Affiliation(s)
- Yi Xu
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Ming-Hong Sun
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Yao Xu
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Jia-Qian Ju
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Meng-Hao Pan
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Zhen-Nan Pan
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Xiao-Han Li
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Shao-Chen Sun
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, 210095, China.
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Scaia MF, de Gregorio LS, Franco-Belussi L, Succi-Domingues M, de Oliveira C. Gonadal, body color, and genotoxic alterations in Lithobates catesbeianus tadpoles exposed to nonylphenol. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:22209-22219. [PMID: 31152429 DOI: 10.1007/s11356-019-05403-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2018] [Accepted: 05/06/2019] [Indexed: 06/09/2023]
Abstract
Endocrine disrupting chemicals are one of the most important factors contributing to worldwide amphibian decline. The 4-nonylphenol (NP) is a degradation product of several compounds, such as detergents and pesticides, affecting the aquatic environment. Here, we test whether treatment with NP has an effect on developing ovarian tissue, nuclear abnormalities in erythrocytes, and body darkness in pre-metamorphic tadpoles of the bullfrog Lithobates catesbeianus. Tadpoles were exposed for 14 days to three different concentrations of NP (1, 10, and 100 μg/L) besides the control group, which was maintained only with water. After determining body coloration, animals were euthanized and gonads and blood were collected and processed for histology and genotoxic analysis. Even though most animals were females, intersex tadpoles were observed in control and treated groups and there were no males in any group. The highest concentration of NP showed an increase in atretic oocytes, but the area corresponding to somatic compartment and early and late germ cells were not affected. Furthermore, all treated groups presented higher amount of nuclear abnormalities in erythrocytes and body darkening when compared with the control group. These results suggest that NP causes genetic damage and morphological alterations in L. catesbeianus tadpoles by disrupting oogenesis, inducing genotoxicity and increasing body coloration. Its effects on gonadal development could cause future impairments in reproduction, while its deleterious effects on genotoxicity and body pigmentation could be used as a biomarker of effect to this compound.
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Affiliation(s)
- María Florencia Scaia
- Post-graduate Program in Animal Biology, Department of Biology, São Paulo State University (UNESP), São José do Rio Preto, São Paulo, 15054-000, Brazil
- Instituto de Biodiversidad y Biología Experimental y Aplicada-CONICET, C1428EGA, Autonomous City of Buenos Aires, Argentina
- Laboratorio de Neuroendocrinología y Comportamiento, Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, C1428EGA, Autonomous City of Buenos Aires, Argentina
- Departamento de Biologia, Instituto de Biociências, Letras e Ciências Exatas - UNESP/IBILCE, Rua Cristóvão Colombo, 2265, Bairro: Jardim Nazareth, São José do Rio Preto, SP, 15054-000, Brazil
| | - Lara Salgueiro de Gregorio
- Post-graduate Program in Animal Biology, Department of Biology, São Paulo State University (UNESP), São José do Rio Preto, São Paulo, 15054-000, Brazil
| | - Lilian Franco-Belussi
- Departamento de Biologia, Instituto de Biociências, Letras e Ciências Exatas - UNESP/IBILCE, Rua Cristóvão Colombo, 2265, Bairro: Jardim Nazareth, São José do Rio Preto, SP, 15054-000, Brazil.
- Instituto de Biociências (InBio), Universidade Federal de Mato Grosso do Sul UFMS, Campo Grande, Brazil.
| | - Maysa Succi-Domingues
- Departamento de Biologia, Instituto de Biociências, Letras e Ciências Exatas - UNESP/IBILCE, Rua Cristóvão Colombo, 2265, Bairro: Jardim Nazareth, São José do Rio Preto, SP, 15054-000, Brazil
| | - Classius de Oliveira
- Departamento de Biologia, Instituto de Biociências, Letras e Ciências Exatas - UNESP/IBILCE, Rua Cristóvão Colombo, 2265, Bairro: Jardim Nazareth, São José do Rio Preto, SP, 15054-000, Brazil
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Chen J, Saili KS, Liu Y, Li L, Zhao Y, Jia Y, Bai C, Tanguay RL, Dong Q, Huang C. Developmental bisphenol A exposure impairs sperm function and reproduction in zebrafish. CHEMOSPHERE 2017; 169:262-270. [PMID: 27880925 DOI: 10.1016/j.chemosphere.2016.11.089] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Revised: 11/15/2016] [Accepted: 11/15/2016] [Indexed: 05/07/2023]
Abstract
The developmental and reproductive toxicity of bisphenol A (BPA) has been demonstrated in a variety of model systems. Zebrafish (Danio rerio) were waterborne-exposed to BPA during three different developmental stages: embryonic period:6 h post fertilization (hpf) to 5 months post fertilization (mpf); larval period: 6 days post fertilization (dpf) to 5 mpf; and sexually mature period: 3 mpf to 5 mpf. Evaluations included F0 adult growth, reproduction parameters, and F1 offspring development. BPA exposure did not affect zebrafish growth in any of exposure groups. Testis weight was decreased only following the 6 hpf to 5 mpf 0.001 μM BPA exposure. The lowest effect level indicated by a reduction in sperm volume, density, motility, and velocity across a range of exposure durations was 0.001 μM, with all but sperm density significant for the longest exposure duration, which was also the only significant endpoint for the lowest exposure concentration in the 3-5 mpf exposure group. Nonmonotonic concentration-response curves were noted for all F0 reproductive endpoints for at least one of the two longest exposure durations. For the F1 offspring of fish exposed from 6 hpf to 5 mpf, malformations and mortality were increased following 0.001 μM BPA exposure, while egg production and fertilization were reduced in higher concentration treatment groups. Overall, BPA exposure during three different developmental periods impaired zebrafish reproductive development, with most significance changes found in the lowest concentration treatment groups. Genetic impacts on gamete development may underlie the secondary effects of reduced fertilization rate, embryonic mortality, and malformations.
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Affiliation(s)
- Jiangfei Chen
- Institute of Environmental Safety and Human Health, Wenzhou Medical University, Wenzhou 325035, China
| | - Katerine S Saili
- Department of Environmental and Molecular Toxicology, The Sinnhuber Aquatic Research Laboratory, and the Environmental Health Sciences Center, Oregon State University, Corvallis, OR 97333, USA
| | - Yueqin Liu
- Institute of Environmental Safety and Human Health, Wenzhou Medical University, Wenzhou 325035, China
| | - Lelin Li
- Institute of Environmental Safety and Human Health, Wenzhou Medical University, Wenzhou 325035, China
| | - Yuxin Zhao
- Institute of Environmental Safety and Human Health, Wenzhou Medical University, Wenzhou 325035, China
| | - Yinhang Jia
- Institute of Environmental Safety and Human Health, Wenzhou Medical University, Wenzhou 325035, China
| | - Chenglian Bai
- Institute of Environmental Safety and Human Health, Wenzhou Medical University, Wenzhou 325035, China
| | - Robert L Tanguay
- Department of Environmental and Molecular Toxicology, The Sinnhuber Aquatic Research Laboratory, and the Environmental Health Sciences Center, Oregon State University, Corvallis, OR 97333, USA
| | - Qiaoxiang Dong
- Institute of Environmental Safety and Human Health, Wenzhou Medical University, Wenzhou 325035, China
| | - Changjiang Huang
- Institute of Environmental Safety and Human Health, Wenzhou Medical University, Wenzhou 325035, China.
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Lou Q, Cao S, Xu W, Zhang Y, Qin Z, Wei W. Molecular characterization and mRNA expression of ribosomal protein L8 in Rana nigromaculata during development and under exposure to hormones. J Environ Sci (China) 2014; 26:2331-2339. [PMID: 25458689 DOI: 10.1016/j.jes.2014.09.018] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2013] [Revised: 01/22/2014] [Accepted: 02/24/2014] [Indexed: 06/04/2023]
Abstract
Like Xenopus laevis, some species of the Rana genus are also used to study endocrine disrupting chemicals (EDCs). Although ribosomal protein L8 (rpl8) is the most-used reference gene for analyzing gene expression by quantitative reverse transcription polymerase chain reaction in Rana, its suitability as the reference gene has never been validated in any species of the Rana genus. We characterized rpl8 cDNA in Rana nigromaculata, a promising native species in East Asia for assaying endocrine disrupting effects. We found that the rpl8 cDNA consisted of 919bp and encoded 257 amino acids, exhibiting high identities of amino acid sequence with known rpl8 in other Rana species. Then, we examined the stability of mRNA expression during development. Compared with elongation factor 1 alpha 1, another common housekeeping gene, neither stage-specific nor tissue-specific expression of the rpl8 gene was found in all tissues examined (brain, liver, intestine, tail, testis and ovary) during R. nigromaculata development. Finally, we investigated rpl8 expression under exposure to hormones. No change in rpl8 mRNA expression was found under exposure to thyroid hormone (T4) and estrogen (estradiol), whereas expression of the corresponding biomarker genes was induced. Our results show that rpl8 is an appropriate reference gene for analyzing gene expression by quantitative reverse transcription polymerase chain reaction for assaying EDCs using R. nigromaculata, and might also provide support for using rpl8 as a reference gene in other Rana species due to the high conservation of rpl8 among the Rana genus.
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Affiliation(s)
- Qinqin Lou
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; College of Environment, Nanjing University of Technology, Nanjing 210009, China.
| | - Shan Cao
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; College of Environment, Nanjing University of Technology, Nanjing 210009, China
| | - Wei Xu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; College of Environment, Nanjing University of Technology, Nanjing 210009, China
| | - Yinfeng Zhang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Zhanfen Qin
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
| | - Wuji Wei
- College of Environment, Nanjing University of Technology, Nanjing 210009, China
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Scholz S, Renner P, Belanger SE, Busquet F, Davi R, Demeneix BA, Denny JS, Léonard M, McMaster ME, Villeneuve DL, Embry MR. Alternatives to in vivo tests to detect endocrine disrupting chemicals (EDCs) in fish and amphibians--screening for estrogen, androgen and thyroid hormone disruption. Crit Rev Toxicol 2012. [PMID: 23190036 DOI: 10.3109/10408444.2012.737762] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Endocrine disruption is considered a highly relevant hazard for environmental risk assessment of chemicals, plant protection products, biocides and pharmaceuticals. Therefore, screening tests with a focus on interference with estrogen, androgen, and thyroid hormone pathways in fish and amphibians have been developed. However, they use a large number of animals and short-term alternatives to animal tests would be advantageous. Therefore, the status of alternative assays for endocrine disruption in fish and frogs was assessed by a detailed literature analysis. The aim was to (i) determine the strengths and limitations of alternative assays and (ii) present conclusions regarding chemical specificity, sensitivity, and correlation with in vivo data. Data from 1995 to present were collected related to the detection/testing of estrogen-, androgen-, and thyroid-active chemicals in the following test systems: cell lines, primary cells, fish/frog embryos, yeast and cell-free systems. The review shows that the majority of alternative assays measure effects directly mediated by receptor binding or resulting from interference with hormone synthesis. Other mechanisms were rarely analysed. A database was established and used for a quantitative and comparative analysis. For example, a high correlation was observed between cell-free ligand binding and cell-based reporter cell assays, between fish and frog estrogenic data and between fish embryo tests and in vivo reproductive effects. It was concluded that there is a need for a more systematic study of the predictive capacity of alternative tests and ways to reduce inter- and intra-assay variability.
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Affiliation(s)
- S Scholz
- Department of Bioanalytical Ecotoxicology, UFZ - Helmholtz Centre for Environmental Research, Leipzig, Germany.
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Abstract
The main component of classical contraceptives, 17α-ethinylestradiol (EE2), has high estrogenic activity even at environmentally relevant concentrations. Although estrogenic endocrine disrupting compounds are assumed to contribute to the worldwide decline of amphibian populations by adverse effects on sexual differentiation, evidence for EE2 affecting amphibian mating behaviour is lacking. In this study, we demonstrate that EE2 exposure at five different concentrations (0.296 ng/L, 2.96 ng/L, 29.64 ng/L, 2.96 µg/L and 296.4 µg/L) can disrupt the mating behavior of adult male Xenopus laevis. EE2 exposure at all concentrations lowered male sexual arousal, indicated by decreased proportions of advertisement calls and increased proportions of the call type rasping, which characterizes a sexually unaroused state of a male. Additionally, EE2 at all tested concentrations affected temporal and spectral parameters of the advertisement calls, respectively. The classical and highly sensitive biomarker vitellogenin, on the other hand, was only induced at concentrations equal or higher than 2.96 µg/L. If kept under control conditions after a 96 h EE2 exposure (2.96 µg/L), alterations of male advertisement calls vanish gradually within 6 weeks and result in a lower sexual attractiveness of EE2 exposed males toward females as demonstrated by female choice experiments. These findings indicate that exposure to environmentally relevant EE2 concentrations can directly disrupt male mate calling behavior of X. laevis and can indirectly affect the mating behavior of females. The results suggest the possibility that EE2 exposure could reduce the reproductive success of EE2 exposed animals and these effects might contribute to the global problem of amphibian decline.
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Affiliation(s)
- Frauke Hoffmann
- Department of Ecophysiology and Aquaculture, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Berlin, Germany.
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7
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Huang W, Zhang Y, Jia X, Ma X, Li S, Liu Y, Zhu P, Lu D, Zhao H, Luo W, Yi S, Liu X, Lin H. Distinct expression of three estrogen receptors in response to bisphenol A and nonylphenol in male Nile tilapias (Oreochromis niloticus). FISH PHYSIOLOGY AND BIOCHEMISTRY 2010; 36:237-249. [PMID: 19009365 DOI: 10.1007/s10695-008-9280-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2008] [Accepted: 10/09/2008] [Indexed: 05/27/2023]
Abstract
Environmental estrogens, such as bisphenol A (BisA) and nonylphenol (NP), have been shown to affect the estrogen receptor (ER) expression and induce male reproductive abnormalities. To elucidate molecular mechanisms of action of xenoestrogenic chemicals on the expression of estrogen receptors in the testes of Nile tilapia (Oreochromis niloticus), three full-length cDNAs respectively encoding ntERalpha, ntERbeta1 and ntERbeta2 were cloned from testes. The amino acid sequences of ntERalpha, ntERbeta1 and ntERbeta2 showed a high degree of similarity to the relevant fish species. Tissue-specific expression study showed that three receptors were highly expressed in pituitary, liver, testis, kidney and intestine tissues. The ntERalpha, ntERbeta1 and ntERbeta2 mRNA expressions were significantly higher at the sexual early recrudescing stage than at other recrudesced stages. After being exposed to xenoestrogens from weeks 2 to 4, the ntERalpha mRNA levels were increased significantly in testes after NP treatment at all sampling times or after 4 weeks of exposure to BPA. The ntERbeta1 mRNA levels remained unchanged, while a significant decrease of the ntERbeta2 mRNA level was observed in testes after exposure to NP and BPA. The present study demonstrates that the regulation of all three ntER subtypes in testes may act via different molecular mechanisms of exposure to NP and BPA.
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Affiliation(s)
- Weiren Huang
- State Key Laboratory of Biocontrol, Institute of Aquatic Economic Animals, and the Guangdong Province Key Laboratory for Aquatic Economic Animals, School of Life Science, Sun Yat-Sen University, Guangzhou 510275, China
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Langlois VS, Carew AC, Pauli BD, Wade MG, Cooke GM, Trudeau VL. Low levels of the herbicide atrazine alter sex ratios and reduce metamorphic success in Rana pipiens tadpoles raised in outdoor mesocosms. ENVIRONMENTAL HEALTH PERSPECTIVES 2010; 118:552-7. [PMID: 20368127 PMCID: PMC2854734 DOI: 10.1289/ehp.0901418] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2009] [Accepted: 11/19/2009] [Indexed: 05/20/2023]
Abstract
BACKGROUND There are conflicting reports regarding the effects of atrazine (ATZ) on amphibian development. Therefore, further studies are needed to examine the potential mechanisms of action of ATZ in amphibians. OBJECTIVES Our aim in this study was to determine whether low concentrations of ATZ affect gonadal development and metamorphosis in the Northern leopard frog, Rana pipiens. METHODS Tadpoles were exposed in outdoor mesocosms to nominal concentrations of 0.1 and 1.8 microg/L of formulated ATZ from Gosner stage 27 (G27) to metamorphic climax (G42). Exposure to 17alpha-ethinylestradiol (EE2; 1.5 microg/L) provided a positive control for induction of testicular oocytes in males. Endocrine-related gene expression and gonadal histopathology were examined at G42 and in a subset of premetamorphic G34 tadpoles that failed to metamorphose. RESULTS Gonadal gross morphology revealed that the 1.8-microg/L ATZ treatment produced 20% more females compared with the control. Histologic analysis revealed that 22% of EE2-treated males had testicular oocytes, whereas none were observed in any animals from the control or either ATZ groups. ATZ increased brain estrogen receptor alpha mRNA to 2.5 times that of the control at premetamorphosis and altered liver levels of 5beta-reductase activity at metamorphosis. In contrast, brain aromatase mRNA level and activity did not change. ATZ treatments significantly reduced metamorphic success (number of animals reaching metamorphosis) without affecting body weight, snout-vent length, or age at metamorphosis. Gene expression analysis indicated that ATZ decreased the expression of deiodinase type 3 in the tail at premetamorphosis. CONCLUSIONS Our study indicates that exposure to low concentrations of ATZ in experimental mesocosms alters gonadal differentiation and metamorphosis in developing R. pipiens.
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Affiliation(s)
- Valérie S. Langlois
- Centre for Advanced Research in Environmental Genomics (CAREG), Department of Biology, University of Ottawa, Ottawa, Ontario, Canada
| | - Amanda C. Carew
- Centre for Advanced Research in Environmental Genomics (CAREG), Department of Biology, University of Ottawa, Ottawa, Ontario, Canada
| | | | | | - Gerard M. Cooke
- Toxicology Research Division, Health Canada, Ottawa, Ontario, Canada
| | - Vance L. Trudeau
- Centre for Advanced Research in Environmental Genomics (CAREG), Department of Biology, University of Ottawa, Ottawa, Ontario, Canada
- Address correspondence to V.L. Trudeau, Centre for Advanced Research in Environmental Genomics (CAREG), Department of Biology, University of Ottawa, 20 Marie-Curie, Ottawa, Ontario, Canada, K1N 6N5. Telephone: (613) 562-5800. Fax: (613) 562-5486. E-mail:
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Oehlmann J, Schulte-Oehlmann U, Kloas W, Jagnytsch O, Lutz I, Kusk KO, Wollenberger L, Santos EM, Paull GC, Van Look KJW, Tyler CR. A critical analysis of the biological impacts of plasticizers on wildlife. Philos Trans R Soc Lond B Biol Sci 2009; 364:2047-62. [PMID: 19528055 PMCID: PMC2873012 DOI: 10.1098/rstb.2008.0242] [Citation(s) in RCA: 425] [Impact Index Per Article: 28.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
This review provides a critical analysis of the biological effects of the most widely used plasticizers, including dibutyl phthalate, diethylhexyl phthalate, dimethyl phthalate, butyl benzyl phthalate and bisphenol A (BPA), on wildlife, with a focus on annelids (both aquatic and terrestrial), molluscs, crustaceans, insects, fish and amphibians. Moreover, the paper provides novel data on the biological effects of some of these plasticizers in invertebrates, fish and amphibians. Phthalates and BPA have been shown to affect reproduction in all studied animal groups, to impair development in crustaceans and amphibians and to induce genetic aberrations. Molluscs, crustaceans and amphibians appear to be especially sensitive to these compounds, and biological effects are observed at environmentally relevant exposures in the low ng l(-1) to microg l(-1) range. In contrast, most effects in fish (except for disturbance in spermatogenesis) occur at higher concentrations. Most plasticizers appear to act by interfering with the functioning of various hormone systems, but some phthalates have wider pathways of disruption. Effect concentrations of plasticizers in laboratory experiments coincide with measured environmental concentrations, and thus there is a very real potential for effects of these chemicals on some wildlife populations. The most striking gaps in our current knowledge on the impacts of plasticizers on wildlife are the lack of data for long-term exposures to environmentally relevant concentrations and their ecotoxicity when part of complex mixtures. Furthermore, the hazard of plasticizers has been investigated in annelids, molluscs and arthropods only, and given the sensitivity of some invertebrates, effects assessments are warranted in other invertebrate phyla.
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Affiliation(s)
- Jörg Oehlmann
- Department of Aquatic Ecotoxicology, Goethe University Frankfurt am Main, Frankfurt am Main, Germany.
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Chapin RE, Adams J, Boekelheide K, Gray LE, Hayward SW, Lees PSJ, McIntyre BS, Portier KM, Schnorr TM, Selevan SG, Vandenbergh JG, Woskie SR. NTP-CERHR expert panel report on the reproductive and developmental toxicity of bisphenol A. ACTA ACUST UNITED AC 2008; 83:157-395. [PMID: 18613034 DOI: 10.1002/bdrb.20147] [Citation(s) in RCA: 301] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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11
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Ko CI, Chesnel A, Mazerbourg S, Kuntz S, Flament S, Chardard D. Female-enriched expression of ERalpha during gonad differentiation of the urodele amphibian Pleurodeles waltl. Gen Comp Endocrinol 2008; 156:234-45. [PMID: 18321504 DOI: 10.1016/j.ygcen.2008.01.012] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/06/2007] [Revised: 01/09/2008] [Accepted: 01/16/2008] [Indexed: 11/20/2022]
Abstract
In the amphibian Pleurodeles waltl, estradiol treatment of genetically male larvae (ZZ) induces male-to-female sex reversal whereas heat treatment of genetically female larvae (ZW) inhibits estradiol synthesis and leads to female-to-male sex reversal. No data are available on estrogen receptors in this species. In the present study, we have isolated a unique full-length pwERalpha cDNA and its 5'-flanking region whose promoter activity was confirmed by transfection assays. RT-PCR studies performed in adult animals using ERalpha-specific primers, revealed that pwERalpha mRNA was present mainly in reproductive tissues: gonads, fat body and oviduct. PwERalpha transcript was also detected in liver, suggesting its implication in vitellogenesis control as in numerous oviparous species. The level of pwERalpha transcripts was also studied during gonad differentiation by quantitative real-time PCR. At stage 54(30d) pwERalpha expression in gonads of ZW larvae was significantly higher than in ZZ ones. This sex-specific discrimination was confirmed when gonad-mesonephros-interrenal complexes (GMI), taken at the same stage, were subjected to whole mount in situ hybridization. In comparison, the female-enriched expression of P450 aromatase, which was studied as a control of ovary differentiation, was observed earlier (stage 54). In ZW larvae reared at 32 degrees C, a condition leading to sex reversal, pwERalpha mRNA level at stage 54(30d) was lower than in control females. Taken together, these results showing a female-enriched and thermosensitive expression of pwERalpha suggest an important role for this receptor in gonad differentiation of the urodele amphibian Pleurodeles waltl.
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Affiliation(s)
- Chia-I Ko
- Nancy-Université, Faculté des Sciences, EA3442 Aspects Cellulaires et Moléculaires de la Reproduction et du Développement, Vandoeuvre-lès-Nancy Cedex, France
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12
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Urbatzka R, Bottero S, Mandich A, Lutz I, Kloas W. Endocrine disrupters with (anti)estrogenic and (anti)androgenic modes of action affecting reproductive biology of Xenopus laevis: I. Effects on sex steroid levels and biomarker expression. Comp Biochem Physiol C Toxicol Pharmacol 2007; 144:310-8. [PMID: 17157075 DOI: 10.1016/j.cbpc.2006.10.008] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2006] [Revised: 07/19/2006] [Accepted: 10/15/2006] [Indexed: 11/25/2022]
Abstract
Adult Xenopus laevis were exposed in vivo to ethinylestradiol, tamoxifen, methyldihydrotestosterone and flutamide as (anti)estrogenic and (anti)androgenic compounds, respectively, for four weeks at a concentration of 10(-8) M and to Lambro river water, a polluted river from Italy. Effects of the treatments were analysed by mRNA expression of retinol-binding protein (RBP), transferrin (TF), transthyretin (TTR) and vitellogenin (VTG) in the liver of male and female X. laevis, to analyse the potential of these genes to detect endocrine disrupting compounds (EDC) with different modes of action. In addition, plasma VTG and sex steroid levels, estradiol-17beta (E(2)) and testosterone (T), were analysed. Sex steroids were depressed by ethinylestradiol in both sexes whereas tamoxifen increased E(2) in females. The induction of VTG protein plasma levels was more pronounced at the protein level compared to hepatic VTG mRNA expression in response to estrogenic treatment but VTG mRNA expression detected both, estrogenic and antiestrogenic EDC. The mRNA expression of TF was decreased by estrogenic and increased by antiestrogenic treatment while TTR mRNA expression was down-regulated and RBP mRNA up-regulated by estrogenic exposure. The other treatments did not affect the mRNA expression of the examined genes.
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Affiliation(s)
- Ralph Urbatzka
- Department of Inland Fisheries, Leibniz-Institute for Freshwater Ecology and Inland Fisheries, Berlin, Germany
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Veldhoen N, Skirrow RC, Ji L, Domanski D, Bonfield ER, Bailey CM, Helbing CC. Use of heterologous cDNA arrays and organ culture in the detection of thyroid hormone-dependent responses in a sentinel frog, Rana catesbeiana. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY D-GENOMICS & PROTEOMICS 2006; 1:187-99. [DOI: 10.1016/j.cbd.2005.10.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2005] [Revised: 10/02/2005] [Accepted: 10/04/2005] [Indexed: 01/13/2023]
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