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Cripps SM, Marshall SA, Mattiske DM, Ingham RY, Pask AJ. Estrogenic endocrine disruptor exposure directly impacts erectile function. Commun Biol 2024; 7:403. [PMID: 38565966 PMCID: PMC10987563 DOI: 10.1038/s42003-024-06048-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2023] [Accepted: 03/14/2024] [Indexed: 04/04/2024] Open
Abstract
Erectile dysfunction (ED) is an extremely prevalent condition which significantly impacts quality of life. The rapid increase of ED in recent decades suggests the existence of unidentified environmental risk factors contributing to this condition. Endocrine Disrupting Chemicals (EDCs) are one likely candidate, given that development and function of the erectile tissues are hormonally dependent. We use the estrogenic-EDC diethylstilbestrol (DES) to model how widespread estrogenic-EDC exposure may impact erectile function in humans. Here we show that male mice chronically exposed to DES exhibit abnormal contractility of the erectile tissue, indicative of ED. The treatment did not affect systemic testosterone production yet significantly increased estrogen receptor α (Esr1) expression in the primary erectile tissue, suggesting EDCs directly impact erectile function. In response, we isolated the erectile tissue from mice and briefly incubated them with the estrogenic-EDCs DES or genistein (a phytoestrogen). These acute-direct exposures similarly caused a significant reduction in erectile tissue contractility, again indicative of ED. Overall, these findings demonstrate a direct link between estrogenic EDCs and erectile dysfunction and show that both chronic and acute estrogenic exposures are likely risk factors for this condition.
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Affiliation(s)
- Samuel M Cripps
- School of BioSciences, The University of Melbourne, Melbourne, Australia
| | - Sarah A Marshall
- The Ritchie Centre, Department of Obstetrics & Gynaecology, Monash University, Melbourne, Australia
| | - Deidre M Mattiske
- School of BioSciences, The University of Melbourne, Melbourne, Australia
| | - Rachel Y Ingham
- School of BioSciences, The University of Melbourne, Melbourne, Australia
| | - Andrew J Pask
- School of BioSciences, The University of Melbourne, Melbourne, Australia.
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2
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Blanc-Legendre M, Sire S, Christophe A, Brion F, Bégout ML, Cousin X. Embryonic exposures to chemicals acting on brain aromatase lead to different locomotor effects in zebrafish larvae. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2023; 102:104221. [PMID: 37451529 DOI: 10.1016/j.etap.2023.104221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Revised: 06/22/2023] [Accepted: 07/10/2023] [Indexed: 07/18/2023]
Abstract
Pathways underlying neurodevelopmental effects of endocrine disruptors (EDs) remain poorly known. Expression of brain aromatase (aroB), responsible for estrogen production in the brain of teleosts, is regulated by estrogenic EDs and could play a role in their behavioral effects. We exposed zebrafish eleutheroembryos (0-120 h post-fertilization) to various concentrations of 16 estrogenic chemicals (incl. bisphenols and contraceptives), and of 2 aroB inhibitors. Behavior was monitored using a photomotor response test procedure. Both aroB inhibitors (clotrimazole and prochloraz) and a total of 6 estrogenic EDs induced significant behavioral alterations, including DM-BPA, BPC and BPS-MPE, three bisphenol substitutes which behavioral effects were, to our knowledge, previously unknown. However, no consensus was reported on the effects among tested substances. It appears that behavioral changes could not be linked to groups of substances defined by their specificity or potency to modulate aroB expression, or by their structure. Altogether, behavioral effects of estrogenic EDs in 120 h post-fertilization larvae appear unrelated to aroB but are nonetheless not to be neglected in the context of environmental safety.
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Affiliation(s)
| | - Sacha Sire
- MARBEC, Univ Montpellier, CNRS, Ifremer, IRD, INRAE, Palavas, France
| | - Armelle Christophe
- Ecotoxicologie des substances et des milieux, Parc ALATA, INERIS, Verneuil-en-Halatte, France
| | - François Brion
- Ecotoxicologie des substances et des milieux, Parc ALATA, INERIS, Verneuil-en-Halatte, France
| | | | - Xavier Cousin
- MARBEC, Univ Montpellier, CNRS, Ifremer, IRD, INRAE, Palavas, France
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3
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Korkmaz NE, Caglar NB, Aksu A, Unsal T, Balcıoglu EB, Cavus Arslan H, Demirel N. Occurrence, bioconcentration, and human health risks of pharmaceuticals in biota in the Sea of Marmara, Türkiye. CHEMOSPHERE 2023; 325:138296. [PMID: 36898445 DOI: 10.1016/j.chemosphere.2023.138296] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Revised: 03/01/2023] [Accepted: 03/02/2023] [Indexed: 06/18/2023]
Abstract
The presence, bioconcentration, and health risk via seafood consumption of 11 pharmaceutical compounds belonging to different therapeutic groups (anti-inflammatory, antiepileptic, lipid regulators, and hormones) were investigated in the muscle tissues of fish and the meat of shrimp in the Sea of Marmara. Six biota species (Merlangius merlangus, Trachurus meditterraneus, Serranus hepatus, Pomatomus saltatrix, Parapenaeus longirostris, Spratus sprattus) were collected from the five stations in October and April 2019. Ultrasonic extraction method followed by solid phase extraction was used for extraction of pharmaceutical compounds from biota samples and then analyzed using high-performance liquid chromatography. Of the 11 compounds, 10 were detected in biota species. Ibuprofen was the most frequently detected pharmaceutical in the biota tissues at high concentrations (<3.0-1225 ng/g, dw). The other widely detected compounds were fenoprofen (<3.6-323 ng/g, dw), gemfibrozil (<3.2-480 ng/g, dw), 17α-ethynylestradiol (<2.0-462 ng/g, dw), and carbamazepine (<7.6-222 ng/g, dw). The bioconcentration factors of the selected pharmaceuticals calculated in various aquatic organisms ranged from 9 to 2324 L/kg. The estimated daily intakes of anti-inflammatories, antiepileptics, lipid regulators, and hormones via seafood consumption were 0.37-568, 1.1-324, 8.5-197, 3-340 ng/kg bw. Day, respectively. Based on hazard quotients, estrone, 17β-estradiol, and 17α-ethynylestradiol may pose a health risk to humans through the consumption of this seafood.
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Affiliation(s)
- Nagihan E Korkmaz
- Istanbul University, Institute of Marine Sciences and Management, Department of Chemical Oceanography, Istanbul, Turkey
| | - Nuray Balkis Caglar
- Istanbul University, Institute of Marine Sciences and Management, Department of Chemical Oceanography, Istanbul, Turkey.
| | - Abdullah Aksu
- Istanbul University, Institute of Marine Sciences and Management, Department of Chemical Oceanography, Istanbul, Turkey
| | - Tuba Unsal
- Istanbul University, Institute of Marine Sciences and Management, Department of Chemical Oceanography, Istanbul, Turkey
| | - Esra Billur Balcıoglu
- Istanbul University, Institute of Marine Sciences and Management, Department of Chemical Oceanography, Istanbul, Turkey
| | - Hande Cavus Arslan
- Halic University, Department of Industrial Engineering, Istanbul, Turkey
| | - Nazli Demirel
- Istanbul University, Institute of Marine Sciences and Management, Department of Physical Oceanography and Marine Biology, Istanbul, Turkey
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4
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Liu S, Chen Y, Li T, Qiao L, Yang Q, Rong W, Liu Q, Wang W, Song J, Wang X, Liu Y. Effects of 17α-Methyltestosterone on the Transcriptome and Sex Hormones in the Brain of Gobiocypris rarus. Int J Mol Sci 2023; 24:ijms24043571. [PMID: 36834982 PMCID: PMC9966397 DOI: 10.3390/ijms24043571] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Revised: 02/03/2023] [Accepted: 02/08/2023] [Indexed: 02/12/2023] Open
Abstract
17α-Methyltestosterone (MT), a synthetic environmental endocrine disruptor with androgenic effects, has been shown to disrupt the reproductive system and inhibit germ cell maturation in Gobiocypris rarus. To further investigate the regulation of gonadal development by MT through the hypothalamic-pituitary-gonadal (HPG) axis, G. rarus were exposed to 0, 25, 50, and 100 ng/L of MT for 7, 14, and 21 days. We analyzed its biological indicators, gonadotropin-releasing hormone (GnRH), gonadotropins, reproduction-related gene expression, and brain tissue transcriptome profiles. We found a significant decrease in the gonadosomatic index (GSI) in G. rarus males exposed to MT for 21 days compared to the control group. GnRH, follicle-stimulating hormone (FSH), and luteinizing hormone (LH) levels, as well as the expressions of the gnrh3, gnrhr1, gnrhr3, fshβ, and cyp19a1b genes, were significantly reduced in the brains of both male and female fish when exposed to 100 ng/L MT for 14 days compared to the controls. Therefore, we further constructed four RNA-seq libraries from 100 ng/L MT-treated groups of male and female fish, obtaining 2412 and 2509 DEGs in male and female brain tissue, respectively. Three common pathways were observed to be affected in both sexes after exposure to MT, namely, nicotinate and nicotinamide metabolism, focal adhesion, and cell adhesion molecules. Furthermore, we found that MT affected the PI3K/Akt/FoxO3a signaling pathway through the upregulation of foxo3 and ccnd2, and the downregulation of pik3c3 and ccnd1. Therefore, we hypothesize that MT interferes with the levels of gonadotropin-releasing hormone (GnRH, FSH, and LH) in G. rarus brains through the PI3K/Akt/FoxO3a signaling pathway, and affects the expression of key genes in the hormone production pathway (gnrh3, gnrhr1 and cyp19a1b) to interfere with the stability of the HPG axis, thus leading to abnormal gonadal development. This study provides a multidimensional perspective on the damaging effects of MT on fish and confirms that G. rarus is a suitable model animal for aquatic toxicology.
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Soloperto S, Nihoul F, Olivier S, Poret A, Couteau J, Halm-Lemeille MP, Danger JM, Aroua S. Effects of 17α-Ethinylestradiol (EE2) exposure during early life development on the gonadotropic axis ontogenesis of the European sea bass, Dicentrarchus labrax. Comp Biochem Physiol A Mol Integr Physiol 2022; 271:111260. [PMID: 35724955 DOI: 10.1016/j.cbpa.2022.111260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Revised: 05/27/2022] [Accepted: 06/14/2022] [Indexed: 10/18/2022]
Abstract
Exposure of young organisms to oestrogenic endocrine disrupting chemicals (EDCs) can elicit adverse effects, particularly on the reproductive function. In fish, as in other vertebrates, reproduction is controlled by the neuroendocrine gonadotropic axis, whose components are mainly regulated by sex steroids and may then be targets for EDCs. In the present study, we investigated the effects of a xenoestrogen exposure on the ontogenesis of the gonadotropic axis in European sea bass. After exposure of hatching larvae for 8 days to 17α-ethinylestradiol (EE2) (0.5 nM and 50 nM), gene expression for kisspeptins (kiss1, kiss2), gonadotropin-releasing hormones (gnrh1, gnrh2, gnrh3), gonadotropin beta subunits (lhβ and fshβ) and brain type aromatase (cyp19a1b) were measured using quantitative real-time PCR. Our results demonstrate that EE2 strongly stimulated the expression of brain type aromatase (cyp19a1b) in sea bass larvae. In addition, EE2 exposure also affected the mRNA levels of kiss1, gnrh1 and gnrh3 by inducing a downregulation of these genes during the early developmental stages, while no effect was seen in gnrh2, lhβ and fshβ. These results reinforce the idea that the larval development is a sensitive critical period in regard to endocrine disruption and that the gonadotropic axis in the developing sea bass is sensitive to xenoestrogen exposure.
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Affiliation(s)
- Sofia Soloperto
- UMR-I 02 INERIS-URCA-ULH SEBIO, Normandie Univ, UNIHAVRE, FR CNRS 3730 Scale, Le Havre, France
| | - Florent Nihoul
- UMR-I 02 INERIS-URCA-ULH SEBIO, Normandie Univ, UNIHAVRE, FR CNRS 3730 Scale, Le Havre, France
| | - Stéphanie Olivier
- UMR-I 02 INERIS-URCA-ULH SEBIO, Normandie Univ, UNIHAVRE, FR CNRS 3730 Scale, Le Havre, France
| | - Agnès Poret
- UMR-I 02 INERIS-URCA-ULH SEBIO, Normandie Univ, UNIHAVRE, FR CNRS 3730 Scale, Le Havre, France
| | | | | | - Jean-Michel Danger
- UMR-I 02 INERIS-URCA-ULH SEBIO, Normandie Univ, UNIHAVRE, FR CNRS 3730 Scale, Le Havre, France
| | - Salima Aroua
- UMR-I 02 INERIS-URCA-ULH SEBIO, Normandie Univ, UNIHAVRE, FR CNRS 3730 Scale, Le Havre, France.
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6
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Roy B, Basak R, Rai U. Impact of xenoestrogens on sex differentiation and reproduction in teleosts. AQUACULTURE AND FISHERIES 2022. [DOI: 10.1016/j.aaf.2022.02.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Franssen D, Svingen T, Lopez Rodriguez D, Van Duursen M, Boberg J, Parent AS. A Putative Adverse Outcome Pathway Network for Disrupted Female Pubertal Onset to Improve Testing and Regulation of Endocrine Disrupting Chemicals. Neuroendocrinology 2022; 112:101-114. [PMID: 33640887 DOI: 10.1159/000515478] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Accepted: 02/25/2021] [Indexed: 11/19/2022]
Abstract
The average age for pubertal onset in girls has declined over recent decades. Epidemiological studies in humans and experimental studies in animals suggest a causal role for endocrine disrupting chemicals (EDCs) that are present in our environment. Of concern, current testing and screening regimens are inadequate in identifying EDCs that may affect pubertal maturation, not least because they do not consider early-life exposure. Also, the causal relationship between EDC exposure and pubertal timing is still a matter of debate. To address this issue, we have used current knowledge to elaborate a network of putative adverse outcome pathways (pAOPs) to identify how chemicals can affect pubertal onset. By using the AOP framework, we highlight current gaps in mechanistic understanding that need to be addressed and simultaneously point towards events causative of pubertal disturbance that could be exploited for alternative test methods. We propose 6 pAOPs that could explain the disruption of pubertal timing by interfering with the central hypothalamic trigger of puberty, GnRH neurons, and by so doing highlight specific modes of action that could be targeted for alternative test method development.
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Affiliation(s)
- Delphine Franssen
- Neuroendocrinology Unit, GIGA Neurosciences, University of Liège, Liège, Belgium
| | - Terje Svingen
- Division of Diet, Disease Prevention and Toxicology, National Food Institute, Technical University of Denmark, Kongens Lyngby, Denmark
| | | | - Majorie Van Duursen
- Department of Environment and Health, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Julie Boberg
- Division of Diet, Disease Prevention and Toxicology, National Food Institute, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Anne-Simone Parent
- Neuroendocrinology Unit, GIGA Neurosciences, University of Liège, Liège, Belgium
- Department of Pediatrics, CHU de Liège, Liège, Belgium
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8
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Takesono A, Kudoh T, Tyler CR. Application of Transgenic Zebrafish Models for Studying the Effects of Estrogenic Endocrine Disrupting Chemicals on Embryonic Brain Development. Front Pharmacol 2022; 13:718072. [PMID: 35264948 PMCID: PMC8900011 DOI: 10.3389/fphar.2022.718072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Accepted: 01/14/2022] [Indexed: 11/13/2022] Open
Abstract
Endocrine disrupting chemicals (EDCs) are environmental pollutants that mimic hormones and/or disrupt their function. Estrogenic EDCs (eEDCs) interfere with endogenous estrogen signalling pathway(s) and laboratory animal and human epidemiological studies have provided evidence for a causal link between exposure to them during embryonic/early life and neurological impairments. However, our understanding of the molecular and cellular mechanism(s) underlying eEDCs exposure effects on brain development, tissue architecture and function and behaviour are limited. Transgenic (TG) zebrafish models offer new approach methodologies (NAMs) to help identify the modes of action (MoAs) of EDCs and their associated impacts on tissue development and function. Estrogen biosensor TG zebrafish models have been applied to study eEDC interactions and resulting transcriptional activation (via a fluorescent reporter expression) across the entire body of the developing zebrafish embryo, including in real time. These estrogen biosensor TG zebrafish models are starting to deepen our understanding of the spatiotemporal actions of eEDCs and their resulting impacts on neurological development, brain function and behaviour. In this review, we first investigate the links between early life exposure to eEDCs and neurodevelopmental alterations in model organisms (rodents and zebrafish) and humans. We then present examples of the application of estrogen biosensor and other TG zebrafish models for elucidating the mechanism(s) underlying neurodevelopmental toxicities of eEDCs. In particular we illustrate the utility of combining estrogen biosensor zebrafish models with other TG zebrafish models for understanding the effects of eEDCs on the brain, spanning cellular processes, brain circuitry, neurophysiology and behaviour. Finally, we discuss the future prospects of TG zebrafish models as experimental models for studying more complex scenarios for exposure to contaminant mixtures on neurological development and function.
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Affiliation(s)
- Aya Takesono
- *Correspondence: Aya Takesono, ; Charles R. Tyler,
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9
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Lopez-Rodriguez D, Franssen D, Heger S, Parent AS. Endocrine-disrupting chemicals and their effects on puberty. Best Pract Res Clin Endocrinol Metab 2021; 35:101579. [PMID: 34563408 DOI: 10.1016/j.beem.2021.101579] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Sexual maturation in humans is characterized by a unique individual variability. Pubertal onset is a highly heritable polygenic trait but it is also affected by environmental factors such as obesity or endocrine disrupting chemicals. The last 30 years have been marked by a constant secular trend toward earlier age at onset of puberty in girls and boys around the world. More recent data, although more disputed, suggest an increased incidence in idiopathic central precocious puberty. Such trends point to a role for environmental factors in pubertal changes. Animal data suggest that the GnRH-neuronal network is highly sensitive to endocrine disruption during development. This review focuses on the most recent data regarding secular trend in pubertal timing as well as potential new epigenetic mechanisms explaining the developmental and transgenerational effects of endocrine disrupting chemicals on pubertal timing.
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Affiliation(s)
| | - Delphine Franssen
- GIGA Neurosciences, Neuroendocrinology Unit, University of Liège, Belgium
| | - Sabine Heger
- Children's Hospital Bult, Janusz-Korczak-Allee 12, 30173, Hannover, Germany
| | - Anne-Simone Parent
- GIGA Neurosciences, Neuroendocrinology Unit, University of Liège, Belgium; Department of Pediatrics, University Hospital Liège, Belgium.
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Nasri A, Mezni A, Lafon PA, Wahbi A, Cubedo N, Clair P, Harrath AH, Beyrem H, Rossel M, Perrier V. Ethinylestradiol (EE2) residues from birth control pills impair nervous system development and swimming behavior of zebrafish larvae. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 770:145272. [PMID: 33497902 DOI: 10.1016/j.scitotenv.2021.145272] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2020] [Revised: 01/13/2021] [Accepted: 01/15/2021] [Indexed: 06/12/2023]
Abstract
The ubiquitous use of ethinylestradiol (EE2), an active constituent of birth control preparations, results in continuous release of this synthetic estrogen to surface waters. Many studies document the untoward effects of EE2 on the endocrine system of aquatic organisms. Effects of environmental EE2 on the nervous system are still poorly documented. We studied effects of pico- to nanomolar concentrations of EE2 on early nervous system development of zebrafish larvae. EE2 disrupted axonal nerve regeneration and hair cell regeneration up to 50%. Gene expression in larval brain tissues showed significantly upregulated expression of target genes, such as estrogen and progesterone receptors, and aromatase B. In contrast, downregulation of the tyrosine hydroxylase, involved in the synthesis of neurotransmitters, occurred concomitant with diminution of proliferating cells. Overall, the size of exposed fish larvae decreased by 25% and their swimming behavior was modified compared to non-treated larvae. EE2 interferes with nervous system development, both centrally and peripherally, with negative effects on regeneration and swimming behavior. Survival of fish and other aquatic species may be at risk in chronically EE2-contaminated environments.
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Affiliation(s)
- Ahmed Nasri
- Laboratory of Environment Biomonitoring, Unit of coastal Ecology and Ecotoxicology, Faculty of Sciences of Bizerte, University of Carthage, 7021, Zarzouna, Tunisia; U1198 MMDN (Molecular Mechanisms of Neurodegenerative Diseases), Inserm (National Institute for Health and Medical Research), MGX (Montpellier GenomiX), BioCampus, University of Montpellier, 34095, Montpellier, France.
| | - Ali Mezni
- Laboratory of Environment Biomonitoring, Unit of coastal Ecology and Ecotoxicology, Faculty of Sciences of Bizerte, University of Carthage, 7021, Zarzouna, Tunisia
| | - Pierre-André Lafon
- U1198 MMDN (Molecular Mechanisms of Neurodegenerative Diseases), Inserm (National Institute for Health and Medical Research), MGX (Montpellier GenomiX), BioCampus, University of Montpellier, 34095, Montpellier, France
| | - Aymen Wahbi
- Laboratory of Hetero-Organic Compounds and Nanostructured Materials (LR18ES11), Department of Chemistry, Faculty of Sciences of Bizerte, University of Carthage, 7021, Zarzouna, Tunisia
| | - Nicolas Cubedo
- U1198 MMDN (Molecular Mechanisms of Neurodegenerative Diseases), Inserm (National Institute for Health and Medical Research), MGX (Montpellier GenomiX), BioCampus, University of Montpellier, 34095, Montpellier, France
| | - Philippe Clair
- U1198 MMDN (Molecular Mechanisms of Neurodegenerative Diseases), Inserm (National Institute for Health and Medical Research), MGX (Montpellier GenomiX), BioCampus, University of Montpellier, 34095, Montpellier, France
| | - Abdel Halim Harrath
- King Saud University, Zoology Department, College of Science, Box 2455, Riyadh, 11451, Saudi Arabia
| | - Hamouda Beyrem
- Laboratory of Environment Biomonitoring, Unit of coastal Ecology and Ecotoxicology, Faculty of Sciences of Bizerte, University of Carthage, 7021, Zarzouna, Tunisia
| | - Mireille Rossel
- U1198 MMDN (Molecular Mechanisms of Neurodegenerative Diseases), Inserm (National Institute for Health and Medical Research), MGX (Montpellier GenomiX), BioCampus, University of Montpellier, 34095, Montpellier, France
| | - Véronique Perrier
- U1198 MMDN (Molecular Mechanisms of Neurodegenerative Diseases), Inserm (National Institute for Health and Medical Research), MGX (Montpellier GenomiX), BioCampus, University of Montpellier, 34095, Montpellier, France
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11
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Ogawa S, Pfaff DW, Parhar IS. Fish as a model in social neuroscience: conservation and diversity in the social brain network. Biol Rev Camb Philos Soc 2021; 96:999-1020. [PMID: 33559323 DOI: 10.1111/brv.12689] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2019] [Revised: 01/19/2021] [Accepted: 01/20/2021] [Indexed: 12/21/2022]
Abstract
Mechanisms for fish social behaviours involve a social brain network (SBN) which is evolutionarily conserved among vertebrates. However, considerable diversity is observed in the actual behaviour patterns amongst nearly 30000 fish species. The huge variation found in socio-sexual behaviours and strategies is likely generated by a morphologically and genetically well-conserved small forebrain system. Hence, teleost fish provide a useful model to study the fundamental mechanisms underlying social brain functions. Herein we review the foundations underlying fish social behaviours including sensory, hormonal, molecular and neuroanatomical features. Gonadotropin-releasing hormone neurons clearly play important roles, but the participation of vasotocin and isotocin is also highlighted. Genetic investigations of developing fish brain have revealed the molecular complexity of neural development of the SBN. In addition to straightforward social behaviours such as sex and aggression, new experiments have revealed higher order and unique phenomena such as social eavesdropping and social buffering in fish. Finally, observations interpreted as 'collective cognition' in fish can likely be explained by careful observation of sensory determinants and analyses using the dynamics of quantitative scaling. Understanding of the functions of the SBN in fish provide clues for understanding the origin and evolution of higher social functions in vertebrates.
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Affiliation(s)
- Satoshi Ogawa
- Brain Research Institute, Jeffrey Cheah School of Medicine and Health Sciences, Monash University Malaysia, Bandar Sunway, Selangor, 47500, Malaysia
| | - Donald W Pfaff
- Laboratory of Neurobiology and Behavior, Rockefeller University, New York, NY, 10065, U.S.A
| | - Ishwar S Parhar
- Brain Research Institute, Jeffrey Cheah School of Medicine and Health Sciences, Monash University Malaysia, Bandar Sunway, Selangor, 47500, Malaysia
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12
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Saaristo M, Craft JA, Tyagi S, Johnstone CP, Allinson M, Ibrahim KS, Wong BBM. Transcriptome-wide changes associated with the reproductive behaviour of male guppies exposed to 17α-ethinyl estradiol. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 270:116286. [PMID: 33360600 DOI: 10.1016/j.envpol.2020.116286] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Revised: 11/24/2020] [Accepted: 12/09/2020] [Indexed: 06/12/2023]
Abstract
Although many pharmaceutical compounds (and their metabolites) can induce harmful impacts at the molecular, physiological and behavioural levels, their underlying mechanistic associations have remained largely unexplored. Here, we utilized RNA-Seq to build a whole brain transcriptome profile to examine the impact of a common endocrine disrupting pharmaceutical (17α-ethinyl estradiol, EE2) on reproductive behaviour in wild guppies (Poecilia reticulata). Specifically, we annotated 16,791 coding transcripts in whole brain tissue in relation to the courtship behaviour (i.e. sigmoid display) of EE2 exposed (at environmentally relevant concentration of 8 ng/L for 28-days) and unexposed guppies. Further, we obtained 10,960 assembled transcripts matching in the non-coding orthologous genomes. Behavioural responses were assessed using a standard mate choice experiment, which allowed us to disentangle chemical cues from visual cues. We found that a high proportion of the RNAseq reads aligned back to our de novo assembled transcriptome with 80.59% mapping rate. Behavioural experiments showed that when males were presented only with female visual cues, there was a significant interaction between male treatment and female treatment in the time spent in the preference zone. This is one of the first studies to show that transcriptome-wide changes are associated with the reproductive behaviour of fish: EE2 exposed male guppies that performed high levels of courtship had a gene profile that deviated the most from the other treatment groups, while both non-courting EE2 and control males had similar gene signatures. Using Gene Ontology pathway analysis, our study shows that EE2-exposed males had gene transcripts enriched for pathways associated with altered immunity, starvation, altered metabolism and spermatogenesis. Our study demonstrates that multiple gene networks orchestrate courting behaviour, emphasizing the importance of investigating impacts of pharmaceuticals on gene networks instead of single genes.
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Affiliation(s)
- Minna Saaristo
- EPA Victoria, Water Sciences, Melbourne, Australia; School of Biological Sciences, Monash University, Australia; Department of Biosciences, Åbo Akademi University, Finland.
| | - John A Craft
- Life Sciences, Glasgow Caledonian University, UK
| | - Sonika Tyagi
- School of Biological Sciences, Monash University, Australia
| | | | - Mayumi Allinson
- Department of Chemical Engineering, University of Melbourne, Australia
| | - Khalid S Ibrahim
- Life Sciences, Glasgow Caledonian University, UK; Department of Biology, University of Zakho, Kurdistan Region, Iraq
| | - Bob B M Wong
- School of Biological Sciences, Monash University, Australia
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Fontaine R, Royan MR, von Krogh K, Weltzien FA, Baker DM. Direct and Indirect Effects of Sex Steroids on Gonadotrope Cell Plasticity in the Teleost Fish Pituitary. Front Endocrinol (Lausanne) 2020; 11:605068. [PMID: 33365013 PMCID: PMC7750530 DOI: 10.3389/fendo.2020.605068] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Accepted: 10/12/2020] [Indexed: 12/26/2022] Open
Abstract
The pituitary gland controls many important physiological processes in vertebrates, including growth, homeostasis, and reproduction. As in mammals, the teleost pituitary exhibits a high degree of plasticity. This plasticity permits changes in hormone production and secretion necessary to meet the fluctuating demands over the life of an animal. Pituitary plasticity is achieved at both cellular and population levels. At the cellular level, hormone synthesis and release can be regulated via changes in cell composition to modulate both sensitivity and response to different signals. At the cell population level, the number of cells producing a given hormone can change due to proliferation, differentiation of progenitor cells, or transdifferentiation of specific cell types. Gonadotropes, which play an important role in the control of reproduction, have been intensively investigated during the last decades and found to display plasticity. To ensure appropriate endocrine function, gonadotropes rely on external and internal signals integrated at the brain level or by the gonadotropes themselves. One important group of internal signals is the sex steroids, produced mainly by the gonadal steroidogenic cells. Sex steroids have been shown to exert complex effects on the teleost pituitary, with differential effects depending on the species investigated, physiological status or sex of the animal, and dose or method of administration. This review summarizes current knowledge of the effects of sex steroids (androgens and estrogens) on gonadotrope cell plasticity in teleost anterior pituitary, discriminating direct from indirect effects.
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Affiliation(s)
- Romain Fontaine
- Physiology Unit, Faculty of Veterinary Medicine, Norwegian University of Life Sciences, Oslo, Norway
| | - Muhammad Rahmad Royan
- Physiology Unit, Faculty of Veterinary Medicine, Norwegian University of Life Sciences, Oslo, Norway
| | - Kristine von Krogh
- Physiology Unit, Faculty of Veterinary Medicine, Norwegian University of Life Sciences, Oslo, Norway
| | - Finn-Arne Weltzien
- Physiology Unit, Faculty of Veterinary Medicine, Norwegian University of Life Sciences, Oslo, Norway
| | - Dianne M. Baker
- Department of Biological Sciences, University of Mary Washington, Fredericksburg, VA, United States
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Zahran E, Elmetwally M, Awadin W, El-Matbouli M. Multiple Xenosteroid Pollutants Biomarker Changes in Xultured Nile Tilapia Using Wastewater Effluents as Their Primary Water Source. Animals (Basel) 2020; 10:ani10091475. [PMID: 32842613 PMCID: PMC7552199 DOI: 10.3390/ani10091475] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2020] [Revised: 08/20/2020] [Accepted: 08/21/2020] [Indexed: 12/11/2022] Open
Abstract
Simple Summary Estrogenic endocrine disruptive chemicals (E-EDCs) are important types of pollutants in fish farms worldwide and a globally concerned problem. In this study, Nile tilapia fish farms receiving wastewater effluents in Egypt were selected as highly, moderately polluted fish farms; besides, a putative control site was deemed low in contamination. Levels of E-EDCs (natural and synthetic steroids, and industrial phenolic compound/bisphenol A (BPA)) was recorded in farm water, and fish tissues at all sites under consideration, mainly, lower levels of testosterone, progesterone, zeranol, and 17β-estradiol were detected compared to the higher level of BPA. Moreover, the effects of these pollutants on fish biometric, reproductive genes, and hormonal biomarkers was evaluated along with the observed associated histopathological alterations. Our findings revealed the detection of some steroidal compounds with a higher level of the BPA. All analyzed biomarkers were reduced to a great extent in the highly polluted sites compared to others, and the histopathological alterations observed were supportive of other measurements. These observations warrant strict monitoring of aquatic pollution sources and the development of strategic plans to control aquaculture pollution. Abstract This study was undertaken to screen levels of xenosteroids (estrogenic endocrine disrupting chemicals/E-EDCs) in Nile tilapia (Oreochromis niloticus) fish farms subjected to water fill from the drain at three sites S1 (highly polluted), S2 (moderately polluted), and a putative reference site (RS). Biometric, hormonal, gene expression, and histopathological analysis were investigated. Testosterone, progesterone, and zeranol residues were detected at (0.12–3.44 µg/L) in water samples of different sites. Bisphenol-A (BPA) exhibited a very high concentration (6.5 µg/mL) in water samples from S1. Testosterone, 17β-estradiol residues were detected in fish tissues from all sites at (0.16–3.8 µg/Kg) and (1.05–5.01 µg/Kg), respectively. BPA residues were detected at a very high concentration in the liver and muscle of fish collected from S1 at higher levels of 25.9 and 48.07 µg/Kg, respectively. The detected E-EDCs, at different sites, particularly BPA, reduced the somatic and testicular growth among sites and oversampling time points. Meanwhile, hepatosomatic index (HSI) was significantly increased in S1 compared to S2. All analyzed genes estrogen receptor-type I (er-I, er-ɑ) and II (er-II, er-ß1), polypeptide 1a (cyp19a1), SRY-box containing gene 9 (sox9), and vitellogenin (vtg) and gonadotropin hormones (luteinizing hormone (LH), follicle-stimulating hormone (FSH)), testosterone, 17β-estradiol, and anti-Mullerian hormone (AMH) were significantly expressed at S1 compared to other sites. Histopathology was more evident in S1 than other sites. These findings warrant immediate strategies development to control aquatic pollution and maintain fish welfare and aquaculture sustainability.
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Affiliation(s)
- Eman Zahran
- Clinical Division of Fish Medicine, University of Veterinary Medicine, Veterinärplatz 1, 1210 Vienna, Austria
- Department of Internal Medicine, Infectious and Fish Diseases, Faculty of Veterinary Medicine, Mansoura University, Mansoura 35516, Egypt
- Correspondence: (E.Z.); (M.E.-M.); Tel.: +20-121-1100560 (E.Z.); +43-125-0774708 (M.E.-M.); Fax: +20-502-200696 (E.Z.); +43-1-250775192 (M.E.-M.)
| | - Mohammed Elmetwally
- Department of Theriogenology, Faculty of Veterinary Medicine, Mansoura University, Mansoura 35516, Egypt;
| | - Walaa Awadin
- Departments of Pathology, Faculty of Veterinary Medicine, Mansoura University, Mansoura 35516, Egypt;
| | - Mansour El-Matbouli
- Clinical Division of Fish Medicine, University of Veterinary Medicine, Veterinärplatz 1, 1210 Vienna, Austria
- Correspondence: (E.Z.); (M.E.-M.); Tel.: +20-121-1100560 (E.Z.); +43-125-0774708 (M.E.-M.); Fax: +20-502-200696 (E.Z.); +43-1-250775192 (M.E.-M.)
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15
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Coumailleau P, Trempont S, Pellegrini E, Charlier TD. Impacts of bisphenol A analogues on zebrafish post-embryonic brain. J Neuroendocrinol 2020; 32:e12879. [PMID: 32749037 DOI: 10.1111/jne.12879] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Revised: 05/19/2020] [Accepted: 05/26/2020] [Indexed: 12/23/2022]
Abstract
Bisphenol A (BPA) is a widely studied and well-recognised endocrine-disrupting chemical, and one of the current issues is its safe replacement by various analogues. Using larva zebrafish as a model, the present study reveals that moderate and chronic exposure to BPA analogues such as bisphenol S, bisphenol F and bisphenol AF may also affect vertebrate neurodevelopment and locomotor activity. Several parameters of embryo-larval development were investigated, such as mortality, hatching, number of mitotically active cell, as defined by 5-bromo-2'-deoxyuridine incorporation and proliferative cell nuclear antigen labelling, aromatase B protein expression in radial glial cell and locomotor activity. Our results show that exposure to several bisphenol analogues induced an acceleration of embryo hatching rate. At the level of the developing brain, a strong up-regulation of the oestrogen-sensitive Aromatase B was also detected in the hypothalamic region. This up-regulation was not associated with effects on the numbers of mitotically active progenitors nor differentiated neurones in the preoptic area and in the nuclear recessus posterior of the hypothalamus zebrafish larvae. Furthermore, using a high-throughput video tracking system to monitor locomotor activity in zebrafish larvae, we show that some bisphenol analogues, such as bisphenol AF, significantly reduced locomotor activity following 6 days of exposure. Taken together, our study provides evidence that BPA analogues can also affect the neurobehavioural development of zebrafish.
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Affiliation(s)
- Pascal Coumailleau
- Univ Rennes, Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail) - UMR_S 1085, Rennes, F-35000, France
| | - Sarah Trempont
- Univ Rennes, Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail) - UMR_S 1085, Rennes, F-35000, France
| | - Elisabeth Pellegrini
- Univ Rennes, Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail) - UMR_S 1085, Rennes, F-35000, France
| | - Thierry D Charlier
- Univ Rennes, Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail) - UMR_S 1085, Rennes, F-35000, France
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Single-Cell Gene Profiling Reveals Social Status-Dependent Modulation of Nuclear Hormone Receptors in GnRH Neurons in a Male Cichlid Fish. Int J Mol Sci 2020; 21:ijms21082724. [PMID: 32326396 PMCID: PMC7215790 DOI: 10.3390/ijms21082724] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Revised: 01/16/2020] [Accepted: 01/17/2020] [Indexed: 12/17/2022] Open
Abstract
Gonadotropin-releasing hormone (GnRH) is essential for the initiation and maintenance of reproductive functions in vertebrates. To date, three distinct paralogue lineages, GnRH1, GnRH2, and GnRH3, have been identified with different functions and regulatory mechanisms. Among them, hypothalamic GnRH1 neurons are classically known as the hypophysiotropic form that is regulated by estrogen feedback. However, the mechanism of action underlying the estrogen-dependent regulation of GnRH1 has been debated, mainly due to the coexpression of low levels of estrogen receptor (ER) genes. In addition, the role of sex steroids in the modulation of GnRH2 and GnRH3 neurons has not been fully elucidated. Using single-cell real-time PCR, we revealed the expression of genes for estrogen, androgen, glucocorticoid, thyroid, and xenobiotic receptors in GnRH1, GnRH2, and GnRH3 neurons in the male Nile tilapia Oreochromis niloticus. We further quantified expression levels of estrogen receptor genes (ERα, ERβ, and ERγ) in three GnRH neuron types in male tilapia of two different social statuses (dominant and subordinate) at the single cell level. In dominant males, GnRH1 mRNA levels were positively proportional to ERγ mRNA levels, while in subordinate males, GnRH2 mRNA levels were positively proportional to ERβ mRNA levels. These results indicate that variations in the expression of nuclear receptors (and possibly steroid sensitivities) among individual GnRH cells may facilitate different physiological processes, such as the promotion of reproductive activities through GnRH1 neurons, and the inhibition of feeding and sexual behaviors through GnRH2 neurons.
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Gao Y, Xie Z, Feng J, Ma W, Zhu L. Different factors determined the toxicokinetics of organic chemicals and nanomaterials exposure to zebrafish (Danio Rerio). ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2019; 186:109810. [PMID: 31629190 DOI: 10.1016/j.ecoenv.2019.109810] [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: 06/26/2019] [Revised: 09/28/2019] [Accepted: 10/11/2019] [Indexed: 06/10/2023]
Abstract
Little is known about how the chemical properties (molecular structure, such as the hydrophobic and hydrophilic end group for organic chemical, and particle size for nanomaterials (NMs)) quantitatively affect the toxicokinetics (TK) in organisms especially in short-term, single-species studies. A novel method based on a first-order one compartment TK model which described the monophasic uptake pattern and two-compartment TK model which adequately described the biphasic metabolism pattern was used to determine the bioconcentration and TK rate constants of organic compounds (n = 17) and nanomaterials (NMs, n = 7) in zebrafish. For both one and two compartment model, the uptake (kin) and elimination (kout) rate constants were fitted using a one- and two-compartment first-order kinetic model, and bioconcentration factors (BCF) and 95% depuration times (t95) for all tested chemicals were calculated, respectively. The results showed that there was significant difference in TK parameters kin, kout, and BCF between organic chemicals and nano metal oxides. For organic compounds, significant correlations were found between the kin and BCF and the octanol-water partition coefficient (Kow) and molecular mass. For nano metal oxides, there was a significant negative correlation between the kin or BCF and particle size, but a positive correlation between kin and Zeta potential of nanoparticles and also a significant positive correlation between kout and particle size or specific surface area. Those findings indicated that NMs particle size does matter in biological influx and efflux processes. Our results suggest that the TK process for organic compound and NMs are correlated by different chemical properties and highlight that the Kow, the absorption kin, metabolism k12 and k21, elimination rate kout, and all the parameters that enable the prediction and partitioning of chemicals need to be precisely determined in order to allow an effective TK modeling. It would therefore appear that the TK process of untested chemicals by a fish may be extrapolated from known chemical properties.
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Affiliation(s)
- Yongfei Gao
- Key Laboratory of Pollution Process and Environmental Criteria of Ministry of Education and Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin, 300071, China
| | - Zhicheng Xie
- Tianjin Academy of Environmental Sciences, Tianjin, 300191, China
| | - Jianfeng Feng
- Key Laboratory of Pollution Process and Environmental Criteria of Ministry of Education and Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin, 300071, China.
| | - Weiqi Ma
- Key Laboratory of Pollution Process and Environmental Criteria of Ministry of Education and Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin, 300071, China
| | - Lin Zhu
- Key Laboratory of Pollution Process and Environmental Criteria of Ministry of Education and Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin, 300071, China
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Brion F, De Gussem V, Buchinger S, Hollert H, Carere M, Porcher JM, Piccini B, Féray C, Dulio V, Könemann S, Simon E, Werner I, Kase R, Aït-Aïssa S. Monitoring estrogenic activities of waste and surface waters using a novel in vivo zebrafish embryonic (EASZY) assay: Comparison with in vitro cell-based assays and determination of effect-based trigger values. ENVIRONMENT INTERNATIONAL 2019; 130:104896. [PMID: 31195222 DOI: 10.1016/j.envint.2019.06.006] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Revised: 05/06/2019] [Accepted: 06/03/2019] [Indexed: 05/15/2023]
Abstract
This study reports the use of the recently developed EASZY assay that uses transgenic cyp19a1b-GFP zebrafish (Danio rerio) embryos to assess in vivo estrogenic activity of 33 surface (SW) and waste water (WW) samples collected across Europe that were previously well-characterized for estrogen hormones and in vitro estrogenic activity. We showed that 18 out of the 33 SW and WW samples induced estrogenic responses in the EASZY assay leading to a significant and concentration-dependent up-regulation of the ER-regulated cyp19a1b gene expression in the developing brain. The in vivo 17β-estradiol-equivalents (EEQs) were highly correlated with, both, the chemical analytical risk quotient (RQ) based on steroidal estrogen concentrations and EEQs reported from five different in vitro reporter gene assays. Regression analyses between the vitro and in vivo effect concentrations allowed us to determine an optimal cut-off value for each in vitro assay, above which in vivo responses were observed. These in vitro assay-specific effect-based trigger values (EBTs), ranging from 0.28 to 0.58 ng EEQ/L define the sensitivity and specificity of the individual in vitro assays for predicting a risk associated with substances acting through the same mode of action in water samples. Altogether, this study demonstrates the toxicological relevance of in vitro-based assessment of estrogenic activity and recommends the use of such in vitro/in vivo comparative approach to refine and validate EBTs for mechanism-based bioassays.
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Affiliation(s)
- François Brion
- Institut National de l'Environnement Industriel et des risques (INERIS), Unité d'Ecotoxicologie in vitro et in vivo, UMR-I 02 SEBIO, 60550 Verneuil-en-Halatte, France.
| | - Valentin De Gussem
- Institut National de l'Environnement Industriel et des risques (INERIS), Unité d'Ecotoxicologie in vitro et in vivo, UMR-I 02 SEBIO, 60550 Verneuil-en-Halatte, France
| | - Sebastian Buchinger
- Bundesanstalt für Gewässerkunde, Am Mainzer Tor 1, 56068 Koblenz, DE, Germany
| | - Henner Hollert
- Institute for Environmental Research, RWTH Aachen University, Worringerweg 1, 52074 Aachen, DE, Germany
| | - Mario Carere
- National Institute of Health, Department Environment and Health, Roma, Italy
| | - Jean-Marc Porcher
- Institut National de l'Environnement Industriel et des risques (INERIS), Unité d'Ecotoxicologie in vitro et in vivo, UMR-I 02 SEBIO, 60550 Verneuil-en-Halatte, France
| | - Benjamin Piccini
- Institut National de l'Environnement Industriel et des risques (INERIS), Unité d'Ecotoxicologie in vitro et in vivo, UMR-I 02 SEBIO, 60550 Verneuil-en-Halatte, France
| | - Christine Féray
- Institut National de l'Environnement Industriel et des risques (INERIS), Chronic Risk Division, 60550 Verneuil-en-Halatte, France; National Reference Laboratory for Monitoring Aquatic Environments (AQUAREF), 60550 Verneuil-en-Halatte, France
| | - Valeria Dulio
- Institut National de l'Environnement Industriel et des risques (INERIS), Chronic Risk Division, 60550 Verneuil-en-Halatte, France
| | - Sarah Könemann
- Swiss Centre for Applied Ecotoxicology Eawag-EPFL, Überlandstrasse 131, Dübendorf, CH, Switzerland; Institute for Environmental Research, RWTH Aachen University, Worringerweg 1, 52074 Aachen, DE, Germany
| | - Eszter Simon
- Swiss Centre for Applied Ecotoxicology Eawag-EPFL, Überlandstrasse 131, Dübendorf, CH, Switzerland
| | - Inge Werner
- Swiss Centre for Applied Ecotoxicology Eawag-EPFL, Überlandstrasse 131, Dübendorf, CH, Switzerland
| | - Robert Kase
- FHNW University of Applied Sciences and Arts Northwestern, Switzerland
| | - Selim Aït-Aïssa
- Institut National de l'Environnement Industriel et des risques (INERIS), Unité d'Ecotoxicologie in vitro et in vivo, UMR-I 02 SEBIO, 60550 Verneuil-en-Halatte, France
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Weiler K, Ramakrishnan S. Bisphenol F causes disruption of gonadotropin-releasing hormone neural development in zebrafish via an estrogenic mechanism. Neurotoxicology 2019; 71:31-38. [DOI: 10.1016/j.neuro.2018.12.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Revised: 11/26/2018] [Accepted: 12/01/2018] [Indexed: 01/08/2023]
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Faheem M, Jahan N, Khaliq S, Lone KP. Modulation of brain kisspeptin expression after bisphenol-A exposure in a teleost fish, Catla catla. FISH PHYSIOLOGY AND BIOCHEMISTRY 2019; 45:33-42. [PMID: 29971526 DOI: 10.1007/s10695-018-0532-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Accepted: 06/22/2018] [Indexed: 06/08/2023]
Abstract
Endocrine-disrupting chemicals (EDCs) affect the neuroendocrine system which in turn influences the reproductive regulation. Neuronal genes disrupted by EDCs are the gonadotropin-releasing hormone (gnrh2), the Kiss/GPR54 system that regulates gonadotropin release and cyp19b gene encoding brain aromatase. In the present study, pubertal Catla catla expected to spawn for first the time in the coming season were exposed to graded concentration of bisphenol-A (10, 100, 1000 μg/l) for 14 days. Messenger RNA (mRNA) levels of neuroendocrine genes, i.e., kisspeptins and their receptors, gonadotropin-releasing hormone type II and brain aromatase were studied after 14 days exposure. Results showed that bisphenol-A (BPA) strongly upregulated expression of kiss1, kiss2, gpr54a, and gnrh2 in fish exposed to 10 μg/l BPA. Fish exposed to 1000 μg/l BPA, expression of kiss1 and gnrh2 were comparable to control while kiss2 mRNA increased compared to controls. Brain aromatase (cyp19b) mRNA expression increased in fish exposed to both 10 and 1000 μg/l BPA. These results indicate that BPA exposure can disrupt organization of the kisspeptin signaling pathways. This neuroendocrine disruption may be the underlying mechanism by which a suite of reproductive abnormalities are induced.
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Affiliation(s)
- Mehwish Faheem
- Department of Zoology, Government College University, Near Nasir Bagh, Katchery Road, Lahore, Pakistan.
| | - Nusrat Jahan
- Department of Zoology, Government College University, Near Nasir Bagh, Katchery Road, Lahore, Pakistan
| | - Saba Khaliq
- Department of Physiology and Cell biology, University of Health Sciences, Lahore, Pakistan
| | - Khalid Parvez Lone
- Department of Physiology and Cell biology, University of Health Sciences, Lahore, Pakistan
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Voisin AS, Kültz D, Silvestre F. Early-life exposure to the endocrine disruptor 17-α-ethinylestradiol induces delayed effects in adult brain, liver and ovotestis proteomes of a self-fertilizing fish. J Proteomics 2018; 194:112-124. [PMID: 30550985 DOI: 10.1016/j.jprot.2018.12.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2018] [Revised: 11/23/2018] [Accepted: 12/07/2018] [Indexed: 01/29/2023]
Abstract
Early-life represents a critically sensitive window to endocrine disrupting chemicals, potentially leading to long-term repercussions on the phenotype later in life. The mechanisms underlying this phenomenon, referred to as the Developmental Origins of Health and Disease (DOHaD), are still poorly understood. To gain molecular understanding of these effects, we exposed mangrove rivulus (Kryptolebias marmoratus) for 28 days post hatching (dph) to 4 and 120 ng/L 17-α-ethinylestradiol, a model xenoestrogen. After 28 days, fish were raised for 140 days in clean water and we performed quantitative label-free proteomics on brain, liver and ovotestis of 168 dph adults. A total of 820, 888 and 420 proteins were robustly identified in the brain, liver and ovotestis, respectively. Effects of 17-α-ethinylestradiol were tissue and dose-dependent: a total of 31, 51 and 18 proteins were differentially abundant at 4 ng/L in the brain, liver and ovotestis, respectively, compared to 20, 25 and 39 proteins at 120 ng/L. Our results suggest that estrogen-responsive pathways, such as lipid metabolism, inflammation, and the innate immune system were affected months after the exposure. In addition, the potential perturbation of S-adenosylmethionine metabolism encourages future studies to investigate the role of DNA methylation in mediating the long-term effects of early-life exposures. SIGNIFICANCE: The Developmental Origins of Health and Disease (DOHaD) states that early life stages of humans and animals are sensitive to environmental stressors and can develop health issues later in life, even if the stress has ceased. Molecular mechanisms supporting DOHaD are still unclear. The mangrove rivulus is a new fish model species naturally reproducing by self-fertilization, making it possible to use isogenic lineages in which all individuals are highly homozygous. This species therefore permits to strongly reduce the confounding factor of genetic variability in order to investigate the effects of environmental stress on the phenotype. After characterizing the molecular phenotype of brain, liver and ovotestis, we obtained true proteomic reaction norms of these three organs in adults after early life stages have been exposed to the common endocrine disruptor 17-α-ethinylestradiol (EE2). Our study demonstrates long-term effects of early-life endocrine disruption at the proteomic level in diverse estrogen-responsive pathways 5 months after the exposure. The lowest tested and environmentally relevant concentration of 4 ng/L had the highest impact on the proteome in brain and liver, highlighting the potency of endocrine disruptors at low concentrations.
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Affiliation(s)
- Anne-Sophie Voisin
- Laboratory of Evolutionary and Adaptive Physiology - Institute of Life, Earth and Environment - University of Namur, 61 Rue de Bruxelles, B5000 Namur, Belgium.
| | - Dietmar Kültz
- Department of Animal Sciences, University of California, Davis, Davis, CA 95616, USA
| | - Frédéric Silvestre
- Laboratory of Evolutionary and Adaptive Physiology - Institute of Life, Earth and Environment - University of Namur, 61 Rue de Bruxelles, B5000 Namur, Belgium
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22
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Smith LC, Lavelle CM, Silva-Sanchez C, Denslow ND, Sabo-Attwood T. Early phosphoproteomic changes for adverse outcome pathway development in the fathead minnow (Pimephales promelas) brain. Sci Rep 2018; 8:10212. [PMID: 29977039 PMCID: PMC6033950 DOI: 10.1038/s41598-018-28395-w] [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: 06/15/2018] [Indexed: 12/14/2022] Open
Abstract
Adverse outcome pathways (AOPs) are conceptual frameworks that organize and link contaminant-induced mechanistic molecular changes to adverse biological responses at the individual and population level. AOPs leverage molecular and high content mechanistic information for regulatory decision-making, but most current AOPs for hormonally active agents (HAAs) focus on nuclear receptor-mediated effects only despite the overwhelming evidence that HAAs also activate membrane receptors. Activation of membrane receptors triggers non-genomic signaling cascades often transduced by protein phosphorylation leading to phenotypic changes. We utilized label-free LC-MS/MS to identify proteins differentially phosphorylated in the brain of fathead minnows (Pimephales promelas) aqueously exposed for 30 minutes to two HAAs, 17α-ethinylestradiol (EE2), a strong estrogenic substance, and levonorgestrel (LNG), a progestin, both components of the birth control pill. EE2 promoted differential phosphorylation of proteins involved in neuronal processes such as nervous system development, synaptic transmission, and neuroprotection, while LNG induced differential phosphorylation of proteins involved in axon cargo transport and calcium ion homeostasis. EE2 and LNG caused similar enrichment of synaptic plasticity and neurogenesis. This study is the first to identify molecular changes in vivo in fish after short-term exposure and highlights transduction of rapid signaling mechanisms as targets of HAAs, in addition to nuclear receptor-mediated pathways.
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Affiliation(s)
- L C Smith
- Department of Physiological Sciences, University of Florida, 1333 Center Dr., Gainesville, FL, 32603, USA.,Center for Environmental and Human Toxicology, University of Florida, 2187 Mowry Rd, Gainesville, FL, 32611, USA
| | - C M Lavelle
- Department of Environmental and Global Health, University of Florida, 1225 Center Dr., Rm 4160, Gainesville, FL, 32610, USA.,Center for Environmental and Human Toxicology, University of Florida, 2187 Mowry Rd, Gainesville, FL, 32611, USA
| | - C Silva-Sanchez
- Interdisciplinary Center for Biotechnology Research, University of Florida, 2033 Mowry Rd, Gainesville, FL, 32601, USA
| | - N D Denslow
- Department of Physiological Sciences, University of Florida, 1333 Center Dr., Gainesville, FL, 32603, USA. .,Center for Environmental and Human Toxicology, University of Florida, 2187 Mowry Rd, Gainesville, FL, 32611, USA.
| | - T Sabo-Attwood
- Department of Environmental and Global Health, University of Florida, 1225 Center Dr., Rm 4160, Gainesville, FL, 32610, USA. .,Center for Environmental and Human Toxicology, University of Florida, 2187 Mowry Rd, Gainesville, FL, 32611, USA.
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Hinfray N, Sohm F, Caulier M, Chadili E, Piccini B, Torchy C, Porcher JM, Guiguen Y, Brion F. Dynamic and differential expression of the gonadal aromatase during the process of sexual differentiation in a novel transgenic cyp19a1a-eGFP zebrafish line. Gen Comp Endocrinol 2018. [PMID: 28648994 DOI: 10.1016/j.ygcen.2017.06.014] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
In zebrafish, there exists a clear need for new tools to study sex differentiation dynamic and its perturbation by endocrine disrupting chemicals. In this context, we developed and characterized a novel transgenic zebrafish line expressing green fluorescent protein (GFP) under the control of the zebrafish cyp19a1a (gonadal aromatase) promoter. In most gonochoristic fish species including zebrafish, cyp19a1a, the enzyme responsible for the synthesis of estrogens, has been shown to play a critical role in the processes of reproduction and sexual differentiation. This novel cyp19a1a-eGFP transgenic line allowed a deeper characterization of expression and localization of cyp19a1a gene in zebrafish gonads both at the adult stage and during development. At the adult stage, GFP expression was higher in ovaries than in testis. We showed a perfect co-expression of GFP and endogenous Cyp19a1a protein in gonads that was mainly localized in the cytoplasm of peri-follicular cells in the ovary and of Leydig and germ cells in the testis. During development, GFP was expressed in all immature gonads of 20 dpf-old zebrafish. Then, GFP expression increased in early differentiated female at 30 and 35dpf to reach a high GFP intensity in well-differentiated ovaries at 40dpf. On the contrary, males consistently displayed low GFP expression as compared to female whatever their stage of development, resulting in a clear dimorphic expression between both sexes. Interestingly, fish that undergoes ovary-to-testis transition (35 and 40dpf) presented GFP levels similar to males or intermediate between females and males. In this transgenic line our results confirm that cyp19a1a is expressed early during development, before the histological differentiation of the gonads, and that the down-regulation of cyp19a1a expression is likely responsible for the testicular differentiation. Moreover, we show that although cyp19a1a expression exhibits a clear dimorphic expression pattern in gonads during sexual differentiation, its expression persists whatever the sex suggesting that estradiol synthesis is important for gonadal development of both sexes. Monitoring the expression of GFP in control and exposed-fish will help determine the sensitivity of this transgenic line to EDCs and to refine mechanistic based-assays for the study of EDCs. In fine, this transgenic zebrafish line will be a useful tool to study physiological processes such as reproduction and sexual differentiation, and their perturbations by EDCs.
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Affiliation(s)
- Nathalie Hinfray
- INERIS, Direction des Risques Chroniques, Pole VIVA, Unite d'ecotoxicologie in vitro et in vivo, BP2, 60550 Verneuil-en-Halatte, France.
| | - Frédéric Sohm
- UMS AMAGEN, CNRS, INRA, Université Paris-Saclay, 91198 Gif-sur-Yvette, France
| | - Morgane Caulier
- INERIS, Direction des Risques Chroniques, Pole VIVA, Unite d'ecotoxicologie in vitro et in vivo, BP2, 60550 Verneuil-en-Halatte, France
| | - Edith Chadili
- INERIS, Direction des Risques Chroniques, Pole VIVA, Unite d'ecotoxicologie in vitro et in vivo, BP2, 60550 Verneuil-en-Halatte, France
| | - Benjamin Piccini
- INERIS, Direction des Risques Chroniques, Pole VIVA, Unite d'ecotoxicologie in vitro et in vivo, BP2, 60550 Verneuil-en-Halatte, France
| | - Camille Torchy
- INERIS, Direction des Risques Chroniques, Pole VIVA, Unite d'ecotoxicologie in vitro et in vivo, BP2, 60550 Verneuil-en-Halatte, France
| | - Jean-Marc Porcher
- INERIS, Direction des Risques Chroniques, Pole VIVA, Unite d'ecotoxicologie in vitro et in vivo, BP2, 60550 Verneuil-en-Halatte, France
| | - Yann Guiguen
- INRA, UR1037, Laboratoire de Physiologie et de Génomique des Poissons (LPGP), IFR140, Ouest-Genopole, F-35000 Rennes, France
| | - François Brion
- INERIS, Direction des Risques Chroniques, Pole VIVA, Unite d'ecotoxicologie in vitro et in vivo, BP2, 60550 Verneuil-en-Halatte, France.
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Choi HS, Lee MJ, Choi SR, Smeester BA, Beitz AJ, Lee JH. Spinal Sigma-1 Receptor-mediated Dephosphorylation of Astrocytic Aromatase Plays a Key Role in Formalin-induced Inflammatory Nociception. Neuroscience 2018; 372:181-191. [PMID: 29289721 DOI: 10.1016/j.neuroscience.2017.12.031] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2017] [Revised: 12/19/2017] [Accepted: 12/20/2017] [Indexed: 01/08/2023]
Abstract
Aromatase is a key enzyme responsible for the biosynthesis of estrogen from testosterone. Although recent evidence indicates that spinal cord aromatase participates in nociceptive processing, the mechanisms underlying its regulation and its involvement in nociception remain unclear. The present study focuses on the potential role of astrocyte aromatase in formalin-induced acute pain and begins to uncover one mechanism by which spinal aromatase activation is controlled. Following intraplantar formalin injection, nociceptive responses were quantified and immunohistochemistry/co-immunoprecipitation assays were used to investigate the changes in spinal Fos expression and the phospho-serine levels of spinal aromatase. Intrathecal (i.t.) injection of letrozole (an aromatase inhibitor) mitigated both the late phase formalin-induced nociceptive responses and formalin-induced spinal Fos expression. Furthermore, formalin-injected mice showed significantly reduced phospho-serine levels of aromatase, which is associated with the rapid activation of this enzyme. However, sigma-1 receptor inhibition with i.t. BD1047 blocked the dephosphorylation of aromatase and potentiated the pharmacological effect of letrozole on formalin-induced nociceptive responses. In addition, i.t. administration of a sub-effective dose of BD1047 potentiated the pharmacological effect of cyclosporin A (a calcineurin inhibitor) on both the formalin-induced reduction in phospho-serine levels of aromatase and nociceptive behavior. These results suggest that dephosphorylation is an important regulatory mechanism involved in the rapid activation of aromatase and that spinal sigma-1 receptors mediate this dephosphorylation of aromatase through an intrinsic calcineurin pathway.
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Affiliation(s)
- Hoon-Seong Choi
- Department of Veterinary Physiology, BK21 PLUS Program for Creative Veterinary Science Research, Research Institute for Veterinary Science and College of Veterinary Medicine, Seoul National University, Seoul, Republic of Korea
| | - Mi-Ji Lee
- Department of Veterinary Physiology, BK21 PLUS Program for Creative Veterinary Science Research, Research Institute for Veterinary Science and College of Veterinary Medicine, Seoul National University, Seoul, Republic of Korea
| | - Sheu-Ran Choi
- Department of Veterinary Physiology, BK21 PLUS Program for Creative Veterinary Science Research, Research Institute for Veterinary Science and College of Veterinary Medicine, Seoul National University, Seoul, Republic of Korea
| | - Branden A Smeester
- Department of Veterinary and Biomedical Sciences, College of Veterinary Medicine, University of Minnesota, St Paul, MN, USA
| | - Alvin J Beitz
- Department of Veterinary and Biomedical Sciences, College of Veterinary Medicine, University of Minnesota, St Paul, MN, USA
| | - Jang-Hern Lee
- Department of Veterinary Physiology, BK21 PLUS Program for Creative Veterinary Science Research, Research Institute for Veterinary Science and College of Veterinary Medicine, Seoul National University, Seoul, Republic of Korea.
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25
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The Primodos components Norethisterone acetate and Ethinyl estradiol induce developmental abnormalities in zebrafish embryos. Sci Rep 2018; 8:2917. [PMID: 29440757 PMCID: PMC5811427 DOI: 10.1038/s41598-018-21318-9] [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: 08/22/2017] [Accepted: 02/01/2018] [Indexed: 12/13/2022] Open
Abstract
Primodos was a hormone pregnancy test used between 1958-1978 that has been implicated with causing a range of birth defects ever since. Though Primodos is no longer used, it's components, Norethisterone acetate and Ethinyl estradiol, are used in other medications today including treatments for endometriosis and contraceptives. However, whether Primodos caused birth defects or not remains controversial, and has been little investigated. Here we used the developing zebrafish embryo, a human cell-line and mouse retinal explants to investigate the actions of the components of Primodos upon embryonic and tissue development. We show that Norethisterone acetate and Ethinyl estradiol cause embryonic damage in a dose and time responsive manner. The damage occurs rapidly after drug exposure, affecting multiple organ systems. Moreover, we found that the Norethisterone acetate and Ethinyl estradiol mixture can affect nerve outgrowth and blood vessel patterning directly and accumulates in the forming embryo for at least 24 hrs. These data demonstrate that Norethisterone acetate and Ethinyl estradiol are potentially teratogenic, depending on dose and embryonic stage of development in the zebrafish. Further work in mammalian model species are now required to build on these findings and determine if placental embryos also are affected by synthetic sex hormones and their mechanisms of action.
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26
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Crago J, Klaper R. Place-based screening of mixtures of dominant emerging contaminants measured in Lake Michigan using zebrafish embryo gene expression assay. CHEMOSPHERE 2018; 193:1226-1234. [PMID: 29874752 DOI: 10.1016/j.chemosphere.2017.11.043] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2017] [Revised: 11/09/2017] [Accepted: 11/10/2017] [Indexed: 05/25/2023]
Abstract
Determining impacts of emerging contaminants is difficult due to the different concentrations of mixtures of these chemicals over a landscape. Assessment approaches need to account for absorption, distribution, metabolism and excretion of the chemicals in an organism, and potential crosstalk between molecular pathways. The goal of this study was to assess the utility of employing a modified zebrafish embryo toxicity (ZFET) assay that assesses morphological alterations and measurements of estrogen-associated mRNA transcripts, to exposure of a mixtures of chemicals at concentrations measured in several locations in Lake Michigan. The 5 pharmaceuticals in this study were carbamazepine, diltiazem, fluoxetine, gemfibrozil and metformin. Exposures consisted of 4 concentrations of each individual chemical, mixture concentrations measured at seven locations in Lake Michigan, or 17β-estradiol. The relative expression of Estrogen Receptor-alpha, brain aromatase (CYP19A2), and gonadotropin releasing hormone 3 mRNA were measured at the end the 6-d exposure to determine estrogenicity of the individual chemical or mixture. In this study, there was significant induction of CYP19A2 in individual exposures of diltiazem, fluoxetine, gemfibrozil and metformin at concentrations measured in Lake Michigan. Exposure to 5 of the 7 chemical mixtures altered the expression of one of the three biomarkers. Transcripts varied across mixtures, indicating that biological screening of whole water samples for potential estrogenicity may need to include alternative molecular pathways other than just steroid receptor binding. This research demonstrates that pairing chemical measurements with a modified ZFET assay, twhich incorporates molecular biomarkers and morphological endpoints, could provide location and mixture specific toxic profiling.
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Affiliation(s)
- Jordan Crago
- School of Freshwater Sciences, University of Wisconsin, Milwaukee, Milwaukee, WI 53204, USA
| | - Rebecca Klaper
- School of Freshwater Sciences, University of Wisconsin, Milwaukee, Milwaukee, WI 53204, USA.
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27
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Gennotte V, Akonkwa B, Mélard C, Denoël M, Cornil CA, Rougeot C. Do sex reversal procedures differentially affect agonistic behaviors and sex steroid levels depending on the sexual genotype in Nile tilapia? JOURNAL OF EXPERIMENTAL ZOOLOGY PART 2018; 327:153-162. [PMID: 29356403 DOI: 10.1002/jez.2080] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2017] [Revised: 06/16/2017] [Accepted: 06/18/2017] [Indexed: 12/12/2022]
Abstract
In Nile tilapia Oreochromis niloticus, phenotypic males and females with different sexual genotypes (XX, XY, YY) have particular behavioral and physiological traits. Compared to natural XX females and XY males, XY and YY females and XX males expressed higher level of aggressiveness that could be related to higher levels of 17β-estradiol and 11-ketotestosterone, respectively. Our results suggest that the presence of a Y chromosome increases aggressiveness in females. However, since the same relationship between aggressiveness and the Y chromosome is not observed in males, we can hypothesize that the differences in aggressiveness are not directly dependent on the genotype but on the sex reversal procedures applied on young fry during their sexual differentiation to produce these breeders. These hormonal treatments could have permanently modified the development of the brain and consequently influenced the behavior of adults independently of their genotype. In both hypotheses (genotype or sex reversal influence), the causes of behavioral modifications have to be searched in an early modification of the brain sexual differentiation.
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Affiliation(s)
- Vincent Gennotte
- Aquaculture Research and Education Center (CEFRA), University of Liège, Tihange, Belgium
| | - Balagizi Akonkwa
- Laboratory of Hydrobiology, Official University of Bukavu, Bukavu, D. R. Congo
| | - Charles Mélard
- Aquaculture Research and Education Center (CEFRA), University of Liège, Tihange, Belgium
| | - Mathieu Denoël
- Laboratory of Fish and Amphibian Ethology, Behavioural Biology Unit, Freshwater and Oceanic Science Unit of Research (FOCUS), University of Liège, Liège, Belgium
| | - Charlotte A Cornil
- Groupe Interdisciplinaire de Génoprotéomique Appliquée (GIGA) Neurosciences, Research Group in Behavioral Neuroendocrinology, University of Liège, Liège, Belgium
| | - Carole Rougeot
- Aquaculture Research and Education Center (CEFRA), University of Liège, Tihange, Belgium
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28
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Cuco AP, Santos JI, Abrantes N, Gonçalves F, Wolinska J, Castro BB. Concentration and timing of application reveal strong fungistatic effect of tebuconazole in a Daphnia-microparasitic yeast model. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2017; 191:141-163. [PMID: 29096087 DOI: 10.1016/j.aquatox.2017.08.005] [Citation(s) in RCA: 88] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Revised: 07/26/2017] [Accepted: 08/07/2017] [Indexed: 05/13/2023]
Abstract
Given the importance of pollutant effects on host-parasite relationships and disease spread, the main goal of this study was to assess the influence of different exposure scenarios for the fungicide tebuconazole (concentration×timing of application) on a Daphnia-microparasitic yeast experimental system. Previous results had demonstrated that tebuconazole is able to suppress Metschnikowia bicuspidata infection at ecologically-relevant concentrations; here, we aimed to obtain an understanding of the mechanism underlying the anti-parasitic (fungicidal or fungistatic) action of tebuconazole. We exposed the Daphnia-yeast system to four nominal tebuconazole concentrations at four timings of application (according to the predicted stage of parasite development), replicated on two Daphnia genotypes, in a fully crossed experiment. An "all-or-nothing" effect was observed, with tebuconazole completely suppressing infection from 13.5μgl-1 upwards, independent of the timing of tebuconazole application. A follow-up experiment confirmed that the suppression of infection occurred within a narrow range of tebuconazole concentrations (3.65-13.5μgl-1), although a later application of the fungicide had to be compensated for by a slight increase in concentration to elicit the same anti-parasitic effect. The mechanism behind this anti-parasitic effect seems to be the inhibition of M. bicuspidata sporulation, since tebuconazole was effective in preventing ascospore production even when applied at a later time. However, this fungicide also seemed to affect the vegetative growth of the yeast, as demonstrated by the enhanced negative effect of the parasite (increasing mortality in one of the host genotypes) at a later time of application of tebuconazole, when no signs of infection were observed. Fungicide contamination can thus affect the severity and spread of disease in natural populations, as well as the inherent co-evolutionary dynamics in host-parasite systems.
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Affiliation(s)
- Ana P Cuco
- Department of Biology, University of Aveiro, Aveiro, Portugal; CESAM, University of Aveiro, Aveiro, Portugal.
| | - Joana I Santos
- Department of Biology, University of Aveiro, Aveiro, Portugal; CESAM, University of Aveiro, Aveiro, Portugal
| | - Nelson Abrantes
- CESAM, University of Aveiro, Aveiro, Portugal; Department of Environment and Planning, University of Aveiro, Aveiro, Portugal
| | - Fernando Gonçalves
- Department of Biology, University of Aveiro, Aveiro, Portugal; CESAM, University of Aveiro, Aveiro, Portugal
| | - Justyna Wolinska
- Department of Ecosystem Research, Leibniz-Institute of Freshwater Ecology and Inland Fisheries (IGB), Berlin, Germany; Department of Biology, Chemistry, Pharmacy, Institute of Biology, Freie Universität Berlin, Berlin, Germany
| | - Bruno B Castro
- CBMA (Centre of Molecular and Environmental Biology), Department of Biology, University of Minho, Braga, Portugal
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29
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Gao J, Zhang Y, Zhang T, Yang Y, Yuan C, Jia J, Wang Z. Responses of gonadal transcriptome and physiological analysis following exposure to 17α-ethynylestradiol in adult rare minnow Gobiocypris rarus. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2017; 141:209-215. [PMID: 28349872 DOI: 10.1016/j.ecoenv.2017.03.028] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2016] [Revised: 03/17/2017] [Accepted: 03/19/2017] [Indexed: 06/06/2023]
Abstract
17α-ethynylestradiol (EE2), a synthetic estrogen commonly used in the oral contraceptive pills, disrupts the sexual differentiation, gonadal development and reproduction in aquatic species. Nowadays aquatic species and even humans still have the potential risks of exposure to EE2. However, the mechanism of EE2 endocrine disruption is still unclear. Aiming to elucidate molecular mechanisms, we analyzed transcriptome profiling of gonads, gonadal histology and the sex steroid hormones in response to EE2 in G. rarus. Through this study, we obtained eight RNA-Seq libraries upon EE2 exposure, and found some key genes and pathways in correlation with the disruption effects of EE2. We found EE2 could disrupt oocyte development and spermatogenesis in adult G. rarus, and EE2 has more obvious disruption effects on male G. rarus than females. Interestingly, EE2 was indicated to be an exogenous DPC-inducing agent and ppp2r3b was suggested to be a spermatogenesis candidate gene in rare minnow. The differential gene expressions of rps30, samp9, ppp2r3b and spartan upon EE2 exposure suggest EE2's disruption effects on gonads could attribute to altered pathways of translation, ribosome biogenesis and cell division.
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Affiliation(s)
- Jiancao Gao
- College of Animal Science and Technology, Northwest A&F University, 22 Xinong Road, Yangling, Shaanxi 712100 China
| | - Yingying Zhang
- College of Animal Science and Technology, Northwest A&F University, 22 Xinong Road, Yangling, Shaanxi 712100 China
| | - Ting Zhang
- College of Animal Science and Technology, Northwest A&F University, 22 Xinong Road, Yangling, Shaanxi 712100 China
| | - Yanping Yang
- College of Animal Science and Technology, Northwest A&F University, 22 Xinong Road, Yangling, Shaanxi 712100 China
| | - Cong Yuan
- College of Animal Science and Technology, Northwest A&F University, 22 Xinong Road, Yangling, Shaanxi 712100 China
| | - Jia Jia
- College of Animal Science and Technology, Northwest A&F University, 22 Xinong Road, Yangling, Shaanxi 712100 China
| | - Zaizhao Wang
- College of Animal Science and Technology, Northwest A&F University, 22 Xinong Road, Yangling, Shaanxi 712100 China.
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30
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Lee Pow CSD, Tilahun K, Creech K, Law JM, Cope WG, Kwak TJ, Rice JA, Aday DD, Kullman SW. Windows of Susceptibility and Consequences of Early Life Exposures to 17β-estradiol on Medaka (Oryzias latipes) Reproductive Success. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2017; 51:5296-5305. [PMID: 28379677 DOI: 10.1021/acs.est.7b01568] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Estrogens and estrogen mimics are commonly found in surface waters and are associated with deleterious effects in fish populations. Impaired fertility and fecundity in fish following chronic exposures to estrogens and estrogen mimics during critical windows in development are well documented. However, information regarding differential reproductive effects of exposure within defined developmental stages remains sparse. In this study, reproductive capacity was assessed in Japanese medaka (Oryzias latipes) after exposure to two concentrations of 17β-estradiol (E2β; 2 ng/L and 50 ng/L) during four distinct stages of development: gonad development, gonad differentiation, development of secondary sex characteristics (SSC) and gametogenesis. Exposure to E2β did not adversely impact survival, hatch success, growth, or genotypic ratios. In contrast, exposure to 50 ng/L E2β during SSC development altered phenotypic ratios and SSC. Exposure to both E2β treatments reduced reproductive capacity (fertility, fecundity) by 7.3-57.4% in adult medaka breeding pairs, with hindrance of SSC development resulting in the largest disruption in breeding capacity (51.6-57.4% decrease) in the high concentration. This study documents differential effects among four critical stages of development and provides insight into factors (window of exposure, exposure concentration and duration of exposure period) contributing to reproductive disruption in fish.
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Affiliation(s)
- Crystal S D Lee Pow
- Department of Biological Sciences, Environmental and Molecular Toxicology Program, North Carolina State University , 850 Main Campus Drive, Raleigh, North Carolina 27606, United States
| | - Kedamawit Tilahun
- Department of Biological Sciences, Environmental and Molecular Toxicology Program, North Carolina State University , 850 Main Campus Drive, Raleigh, North Carolina 27606, United States
| | - Kari Creech
- Department of Biological Sciences, Environmental and Molecular Toxicology Program, North Carolina State University , 850 Main Campus Drive, Raleigh, North Carolina 27606, United States
| | - J Mac Law
- Department of Population Health and Pathobiology, North Carolina State University , 1060 William Moore Drive, Raleigh, North Carolina 27607, United States
| | - W Gregory Cope
- Department of Applied Ecology, North Carolina State University , 127 David Clark Laboratories, Raleigh, North Carolina 27695, United States
| | - Thomas J Kwak
- Department of Applied Ecology, North Carolina State University , 127 David Clark Laboratories, Raleigh, North Carolina 27695, United States
- United States Geological Survey, North Carolina Cooperative Fish and Wildlife Research Unit, Raleigh, North Carolina 27695, United States
| | - James A Rice
- Department of Applied Ecology, North Carolina State University , 127 David Clark Laboratories, Raleigh, North Carolina 27695, United States
| | - D Derek Aday
- Department of Applied Ecology, North Carolina State University , 127 David Clark Laboratories, Raleigh, North Carolina 27695, United States
| | - Seth W Kullman
- Department of Biological Sciences, Environmental and Molecular Toxicology Program, North Carolina State University , 850 Main Campus Drive, Raleigh, North Carolina 27606, United States
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31
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Saaristo M, Wong BBM, Mincarelli L, Craig A, Johnstone CP, Allinson M, Lindström K, Craft JA. Characterisation of the transcriptome of male and female wild-type guppy brains with RNA-Seq and consequences of exposure to the pharmaceutical pollutant, 17α-ethinyl estradiol. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2017; 186:28-39. [PMID: 28246045 DOI: 10.1016/j.aquatox.2017.02.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2016] [Revised: 02/09/2017] [Accepted: 02/14/2017] [Indexed: 06/06/2023]
Abstract
Waterways are increasingly being contaminated by chemical compounds that can disrupt the endocrinology of organisms. One such compound is 17α-ethinyl estradiol (EE2), a synthetic estrogen used in the contraceptive pill. Despite considerable research interest in the effects of EE2 on reproduction and gene expression, surprisingly, only a few studies have capitalised on technologies, such as next-generation sequencing (NGS), to uncover the molecular pathways related to EE2 exposure. Accordingly, using high-throughput sequencing technologies, the aim of our study was to explore the effects of EE2 on brain transcriptome in wild-type male and female guppy (Poecilia reticulata). We conducted two sets of experiments, where fish were exposed to EE2 (measured concentrations: 8ng/L and 38ng/L) in a flow-through system for 21days. The effects on the brain transcriptome on both males and females were assessed using Illumina sequencing (MiSeq and HiSeq) platform followed by bioinformatics analysis (edgeR, DESeq2). Here, we report that exposure to EE2 caused both up- and downregulation of specific transcript abundances, and affected transcript abundance in a sex-specific manner. Specifically, we found 773 transcripts, of which 60 were male-specific, 61 female-specific and 285 treatment-specific. EE2 affected expression of 165 transcripts in males, with 88 downregulated and 77 upregulated, while in females, 120 transcripts were affected with 62 downregulated and 58 upregulated. Finally, RT-qPCR validation demonstrated that expression of transcripts related to transposable elements, neuroserpin and heat shock protein were significantly affected by EE2-exposure. Our study is the first to report brain transcriptome libraries for guppies exposed to EE2. Not only does our study provide a valuable resource, it offers insights into the mechanisms underlying the feminizing effects on the brains of organisms exposed to environmentally realistic concentrations of EE2.
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Affiliation(s)
- Minna Saaristo
- School of Biological Sciences, Monash University, 3800 Victoria, Australia; Environmental and Marine Biology, Åbo Akademi University, 20500 Turku, Finland.
| | - Bob B M Wong
- School of Biological Sciences, Monash University, 3800 Victoria, Australia
| | - Laura Mincarelli
- Life Sciences, Glasgow Caledonian University, Glasgow G4 0BA, UK
| | - Allison Craig
- Life Sciences, Glasgow Caledonian University, Glasgow G4 0BA, UK
| | | | - Mayumi Allinson
- Victorian Centre for Aquatic Pollution Identification and Management (CAPIM), School of Chemistry, 3010 Victoria, Australia
| | - Kai Lindström
- Environmental and Marine Biology, Åbo Akademi University, 20500 Turku, Finland
| | - John A Craft
- Life Sciences, Glasgow Caledonian University, Glasgow G4 0BA, UK
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32
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Caballero-Gallardo K, Olivero-Verbel J, Freeman JL. Toxicogenomics to Evaluate Endocrine Disrupting Effects of Environmental Chemicals Using the Zebrafish Model. Curr Genomics 2016; 17:515-527. [PMID: 28217008 PMCID: PMC5282603 DOI: 10.2174/1389202917666160513105959] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2016] [Revised: 04/15/2016] [Accepted: 04/20/2016] [Indexed: 12/24/2022] Open
Abstract
The extent of our knowledge on the number of chemical compounds related to anthropogenic activities that can cause damage to the environment and to organisms is increasing. Endocrine disrupting chemicals (EDCs) are one group of potentially hazardous substances that include natural and synthetic chemicals and have the ability to mimic endogenous hormones, interfering with their biosynthesis, metabolism, and normal functions. Adverse effects associated with EDC exposure have been documented in aquatic biota and there is widespread interest in the characterization and understanding of their modes of action. Fish are considered one of the primary risk organisms for EDCs. Zebrafish (Danio rerio) are increasingly used as an animal model to study the effects of endocrine disruptors, due to their advantages compared to other model organisms. One approach to assess the toxicity of a compound is to identify those patterns of gene expression found in a tissue or organ exposed to particular classes of chemicals, through new technologies in genomics (toxicogenomics), such as microarrays or whole-genome sequencing. Application of these technologies permit the quantitative analysis of thousands of gene expression changes simultaneously in a single experiment and offer the opportunity to use transcript profiling as a tool to predict toxic outcomes of exposure to particular compounds. The application of toxicogenomic tools for identification of chemicals with endocrine disrupting capacity using the zebrafish model system is reviewed.
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Affiliation(s)
- Karina Caballero-Gallardo
- Environmental and Computational Chemistry Group. Campus of Zaragocilla. School of Pharmaceutical Sciences.University of Cartagena, Cartagena, Colombia
| | - Jesus Olivero-Verbel
- Environmental and Computational Chemistry Group. Campus of Zaragocilla. School of Pharmaceutical Sciences.University of Cartagena, Cartagena, Colombia
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33
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Inagaki T, Smith NL, Sherva KM, Ramakrishnan S. Cross-generational effects of parental low dose BPA exposure on the Gonadotropin-Releasing Hormone3 system and larval behavior in medaka (Oryzias latipes). Neurotoxicology 2016; 57:163-173. [PMID: 27713093 DOI: 10.1016/j.neuro.2016.09.021] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Revised: 09/02/2016] [Accepted: 09/29/2016] [Indexed: 11/18/2022]
Abstract
Growing evidence indicates that chronic exposure to Bisphenol A (BPA) may disrupt normal brain function and behavior mediated by gonadotropin-releasing hormone (GnRH) pathways. Previous studies have shown that low dose BPA (200ng/ml) exposure during embryogenesis altered development of extra-hypothalamic GnRH3 systems and non-reproductive locomotor behavior in medaka. Effects of parental low-dose BPA exposure on the development of GnRH3 systems and locomotor behavior of offspring are not well known. This study examines whether the neurophysiological and behavioral effects of BPA in parents (F0 generation) are carried over to their offspring (F1 generation) using stable transgenic medaka embryos/larvae with GnRH3 neurons tagged with green fluorescent protein (GFP). Parental fish were exposed to BPA (200ng/ml) for either life-long or different developmental time windows. Fertilized F1 eggs were collected and raised in egg/fish water with no environmental exposure to BPA. All experiments were performed on F1 embryos/larvae, which were grouped based on the following parental (F0) BPA exposure conditions - (i) Group 1 (G1): through life; (ii) G2: during embryogenesis and early larval development [1-14days post fertilization (dpf)]; (iii) G3: during neurogenesis (1-5dpf); and (iv) G4: during sex differentiation (5-14dpf). Embryos from unexposed vehicle treated parents served as controls (G0). G1 embryos showed significantly reduced survival rates and delayed hatching time compared to other groups, while G4 embryos hatched significantly earlier than all other groups. At 3 dpf, the GnRH3-GFP intensity was increased by 47% in G3 embryos and decreased in G4 embryos by 59% compared to controls. At 4dpf, G1 fish showed 42% increased intensity, while GFP intensity was reduced by 44% in G3 subjects. In addition, the mean brain size of G1, G3 and G4 embryos were smaller than that of control at 4dpf. At 20dpf, all larvae from BPA-treated parents showed significantly decreased total movement (distance covered) compared with controls, with G2 and G3 fish showing reduced velocity of movement. While at 20 dpf no group differences were seen in the soma diameter of GnRH3-GFP neurons, a 34% decrease in SV2 expression, a marker for synaptic transmission, in G1 larvae was observed. These data suggest that parental BPA exposure during critical windows of embryonic development or chronic treatment affects next-generation offspring both in embryonic and larval brain development as well as larval behavior.
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Affiliation(s)
- T Inagaki
- Department of Biology, University of Puget Sound, Tacoma, WA, USA; Neuroscience Program, University of Puget Sound, Tacoma, WA, USA
| | - N L Smith
- Department of Chemistry/Biochemistry, University of Puget Sound, Tacoma, WA 98416, USA
| | - K M Sherva
- Department of Chemistry/Biochemistry, University of Puget Sound, Tacoma, WA 98416, USA
| | - S Ramakrishnan
- Department of Biology, University of Puget Sound, Tacoma, WA, USA; Neuroscience Program, University of Puget Sound, Tacoma, WA, USA.
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Alharthy KM, Albaqami FF, Thornton C, Corrales J, Willett KL. Mechanistic Evaluation of Benzo[a]pyrene's Developmental Toxicities Mediated by Reduced Cyp19a1b Activity. Toxicol Sci 2016; 155:135-147. [PMID: 27633980 DOI: 10.1093/toxsci/kfw182] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Benzo[a]pyrene (BaP) is a ubiquitous environmental contaminant that is both an endocrine disruptor and a carcinogen. Aromatase (CYP19) is a key enzyme in steroidogenesis that is responsible for conversion of androgens to estrogens and thus plays a key role in steroid homeostasis. We hypothesized that some of the adverse outcomes of early developmental exposure to BaP are the result of reduced Cyp19a1b activity. Our goal was to investigate the role of estrogen homeostasis during early development and determine the role of aromatase inhibition as a relevant mechanism in BaP's developmental toxicities. One-cell zebrafish embryos were injected with a Cyp19a1b-morpholino (MO) or control-MO. Other non-injected embryos were exposed to waterborne BaP, fadrozole (a Cyp19 inhibitor), estradiol (E2), BaP + E2, Cyp19a1b MO + E2, or fadrozole + E2 for 96 hours post-fertilization (hpf). Adverse outcomes were compared between treatments, and the ability of E2 co-exposure to rescue each observed dysmorphology was assessed. BaP significantly decreased cyp19a1b gene expression in 96 hpf zebrafish larvae homogenates. Concentrations of E2 in 48 hpf larvae were significantly decreased by BaP, fadrozole and Cyp19a1b-MO. Cumulative mortality of zebrafish larvae was significantly increased following BaP or fadrozole exposure or Cyp19a1b knockdown compared to controls. E2 co-treatment rescued mortality caused by 10 μg/L BaP, 10 μg/L fadrozole, or Cyp19a1b-MO. In a treatment-blinded morphological assessment of larvae at 96 hpf, several phenotypes were negatively impacted by BaP, fadrozole, or Cyp19a1b knockdown and rescued by exogenous E2 co-treatment; these included body length, optic vesicle size, swim bladder inflation, pericardial and abdominal edema, and incidence of normal larval tail shape. Abnormal pectoral fins were caused by BaP exposure only. Uninflated swim bladders were caused by all treatments including E2 alone. Our results indicate that certain BaP-mediated adverse developmental outcomes were mechanistically in accordance with BaP-mediated Cyp19a1b inhibition.
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Affiliation(s)
- Khalid M Alharthy
- Department of BioMolecular Sciences, Divisions of Pharmacology and Environmental Toxicology, School of Pharmacy, University of Mississippi, Mississippi
| | - Faisal F Albaqami
- Department of BioMolecular Sciences, Divisions of Pharmacology and Environmental Toxicology, School of Pharmacy, University of Mississippi, Mississippi
| | - Cammi Thornton
- Department of BioMolecular Sciences, Divisions of Pharmacology and Environmental Toxicology, School of Pharmacy, University of Mississippi, Mississippi
| | - Jone Corrales
- Department of BioMolecular Sciences, Divisions of Pharmacology and Environmental Toxicology, School of Pharmacy, University of Mississippi, Mississippi
| | - Kristine L Willett
- Department of BioMolecular Sciences, Divisions of Pharmacology and Environmental Toxicology, School of Pharmacy, University of Mississippi, Mississippi
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Green JM, Metz J, Lee O, Trznadel M, Takesono A, Brown AR, Owen SF, Kudoh T, Tyler CR. High-Content and Semi-Automated Quantification of Responses to Estrogenic Chemicals Using a Novel Translucent Transgenic Zebrafish. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:6536-45. [PMID: 27227508 DOI: 10.1021/acs.est.6b01243] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Rapid embryogenesis, together with genetic similarities with mammals, and the desire to reduce mammalian testing, are major incentives for using the zebrafish model in chemical screening and testing. Transgenic zebrafish, engineered for identifying target gene expression through expression of fluorophores, have considerable potential for both high-content and high-throughput testing of chemicals for endocrine activity. Here we generated an estrogen responsive transgenic zebrafish model in a pigment-free "Casper" phenotype, facilitating identification of target tissues and quantification of these responses in whole intact fish. Using the ERE-GFP-Casper model we show chemical type and concentration dependence for green fluorescent protein (GFP) induction and both spatial and temporal responses for different environmental estrogens tested. We also developed a semiautomated (ArrayScan) imaging and image analysis system that we applied to quantify whole body fluorescence responses for a range of different estrogenic chemicals in the new transgenic zebrafish model. The zebrafish model developed provides a sensitive and highly integrative system for identifying estrogenic chemicals, their target tissues and effect concentrations for exposures in real time and across different life stages. It thus has application for chemical screening to better direct health effects analysis of environmental estrogens and for investigating the functional roles of estrogens in vertebrates.
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Affiliation(s)
- Jon M Green
- Biosciences, College of Life and Environmental Sciences, University of Exeter , Geoffrey Pope, Stocker Road, Exeter, Devon EX4 4QD, United Kingdom
| | - Jeremy Metz
- Biosciences, College of Life and Environmental Sciences, University of Exeter , Geoffrey Pope, Stocker Road, Exeter, Devon EX4 4QD, United Kingdom
| | - Okhyun Lee
- Biosciences, College of Life and Environmental Sciences, University of Exeter , Geoffrey Pope, Stocker Road, Exeter, Devon EX4 4QD, United Kingdom
| | - Maciej Trznadel
- Biosciences, College of Life and Environmental Sciences, University of Exeter , Geoffrey Pope, Stocker Road, Exeter, Devon EX4 4QD, United Kingdom
| | - Aya Takesono
- Biosciences, College of Life and Environmental Sciences, University of Exeter , Geoffrey Pope, Stocker Road, Exeter, Devon EX4 4QD, United Kingdom
| | - A Ross Brown
- Biosciences, College of Life and Environmental Sciences, University of Exeter , Geoffrey Pope, Stocker Road, Exeter, Devon EX4 4QD, United Kingdom
| | - Stewart F Owen
- AstraZeneca, Global Environment , Alderley Park, Macclesfield, Cheshire SK10 4TF, United Kingdom
| | - Tetsuhiro Kudoh
- Biosciences, College of Life and Environmental Sciences, University of Exeter , Geoffrey Pope, Stocker Road, Exeter, Devon EX4 4QD, United Kingdom
| | - Charles R Tyler
- Biosciences, College of Life and Environmental Sciences, University of Exeter , Geoffrey Pope, Stocker Road, Exeter, Devon EX4 4QD, United Kingdom
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Pellegrini E, Diotel N, Vaillant-Capitaine C, Pérez Maria R, Gueguen MM, Nasri A, Cano Nicolau J, Kah O. Steroid modulation of neurogenesis: Focus on radial glial cells in zebrafish. J Steroid Biochem Mol Biol 2016; 160:27-36. [PMID: 26151741 DOI: 10.1016/j.jsbmb.2015.06.011] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2015] [Revised: 06/01/2015] [Accepted: 06/16/2015] [Indexed: 10/23/2022]
Abstract
Estrogens are known as steroid hormones affecting the brain in many different ways and a wealth of data now document effects on neurogenesis. Estrogens are provided by the periphery but can also be locally produced within the brain itself due to local aromatization of circulating androgens. Adult neurogenesis is described in all vertebrate species examined so far, but comparative investigations have brought to light differences between vertebrate groups. In teleost fishes, the neurogenic activity is spectacular and adult stem cells maintain their mitogenic activity in many proliferative areas within the brain. Fish are also quite unique because brain aromatase expression is limited to radial glia cells, the progenitor cells of adult fish brain. The zebrafish has emerged as an interesting vertebrate model to elucidate the cellular and molecular mechanisms of adult neurogenesis, and notably its modulation by steroids. The main objective of this review is to summarize data related to the functional link between estrogens production in the brain and neurogenesis in fish. First, we will demonstrate that the brain of zebrafish is an endogenous source of steroids and is directly targeted by local and/or peripheral steroids. Then, we will present data demonstrating the progenitor nature of radial glial cells in the brain of adult fish. Next, we will emphasize the role of estrogens in constitutive neurogenesis and its potential contribution to the regenerative neurogenesis. Finally, the negative impacts on neurogenesis of synthetic hormones used in contraceptive pills production and released in the aquatic environment will be discussed.
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Affiliation(s)
- Elisabeth Pellegrini
- Inserm U1085, Université de Rennes 1, Research Institute in Health, Environment and Occupation, 35000 Rennes, France.
| | - Nicolas Diotel
- Inserm U1085, Université de Rennes 1, Research Institute in Health, Environment and Occupation, 35000 Rennes, France; Inserm UMR 1188, Diabète athérothrombose Thérapies Réunion Océan Indien (DéTROI), plateforme CYROI, Sainte-Clotilde F-97490, France; Université de La Réunion, UMR 1188, Sainte-Clotilde F-97490, France
| | - Colette Vaillant-Capitaine
- Inserm U1085, Université de Rennes 1, Research Institute in Health, Environment and Occupation, 35000 Rennes, France
| | - Rita Pérez Maria
- Inserm U1085, Université de Rennes 1, Research Institute in Health, Environment and Occupation, 35000 Rennes, France; Laboratorio de Ictiología, Instituto Nacional de Limnología (INALI. CONICET-UNL), Paraje El Pozo, Ciudad Universitaria UNL, 3000 Santa Fe, Argentina
| | - Marie-Madeleine Gueguen
- Inserm U1085, Université de Rennes 1, Research Institute in Health, Environment and Occupation, 35000 Rennes, France
| | - Ahmed Nasri
- Inserm U1085, Université de Rennes 1, Research Institute in Health, Environment and Occupation, 35000 Rennes, France; Laboratoire de Biosurveillance de l'Environnement, Unité d'Ecologie côtière et d'Ecotoxicologie, Faculté des Sciences de Bizerte, Zarzouna 7021, Tunisia
| | - Joel Cano Nicolau
- Inserm U1085, Université de Rennes 1, Research Institute in Health, Environment and Occupation, 35000 Rennes, France
| | - Olivier Kah
- Inserm U1085, Université de Rennes 1, Research Institute in Health, Environment and Occupation, 35000 Rennes, France
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Cano-Nicolau J, Garoche C, Hinfray N, Pellegrini E, Boujrad N, Pakdel F, Kah O, Brion F. Several synthetic progestins disrupt the glial cell specific-brain aromatase expression in developing zebra fish. Toxicol Appl Pharmacol 2016; 305:12-21. [PMID: 27245768 DOI: 10.1016/j.taap.2016.05.019] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Revised: 05/24/2016] [Accepted: 05/26/2016] [Indexed: 01/14/2023]
Abstract
The effects of some progestins on fish reproduction have been recently reported revealing the hazard of this class of steroidal pharmaceuticals. However, their effects at the central nervous system level have been poorly studied until now. Notwithstanding, progesterone, although still widely considered primarily a sex hormone, is an important agent affecting many central nervous system functions. Herein, we investigated the effects of a large set of synthetic ligands of the nuclear progesterone receptor on the glial-specific expression of the zebrafish brain aromatase (cyp19a1b) using zebrafish mechanism-based assays. Progesterone and 24 progestins were first screened on transgenic cyp19a1b-GFP zebrafish embryos. We showed that progesterone, dydrogesterone, drospirenone and all the progesterone-derived progestins had no effect on GFP expression. Conversely, all progestins derived from 19-nortesterone induced GFP in a concentration-dependent manner with EC50 ranging from the low nM range to hundreds nM. The 19-nortestosterone derived progestins levonorgestrel (LNG) and norethindrone (NET) were further tested in a radial glial cell context using U251-MG cells co-transfected with zebrafish ER subtypes (zfERα, zfERβ1 or zfERβ2) and cyp19a1b promoter linked to luciferase. Progesterone had no effect on luciferase activity while NET and LNG induced luciferase activity that was blocked by ICI 182,780. Zebrafish-ERs competition assays showed that NET and LNG were unable to bind to ERs, suggesting that the effects of these compounds on cyp19a1b require metabolic activation prior to elicit estrogenic activity. Overall, we demonstrate that 19-nortestosterone derived progestins elicit estrogenic activity by inducing cyp19a1b expression in radial glial cells. Given the crucial role of radial glial cells and neuro-estrogens in early development of brain, the consequences of exposure of fish to these compounds require further investigation.
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Affiliation(s)
- Joel Cano-Nicolau
- Team NEED, Institut de recherche en Santé Environnement et Travail (Irset), INSERM U1085, Université de Rennes 1, Campus de Beaulieu, SFR Biosit, 35042 Rennes cedex, France
| | - Clémentine Garoche
- Unité d'Ecotoxicologie in vitro et in vivo, Institut National de l'Environnement Industriel et des Risques (INERIS), BP 2, 60550 Verneuil-en-Halatte, France
| | - Nathalie Hinfray
- Unité d'Ecotoxicologie in vitro et in vivo, Institut National de l'Environnement Industriel et des Risques (INERIS), BP 2, 60550 Verneuil-en-Halatte, France
| | - Elisabeth Pellegrini
- Team NEED, Institut de recherche en Santé Environnement et Travail (Irset), INSERM U1085, Université de Rennes 1, Campus de Beaulieu, SFR Biosit, 35042 Rennes cedex, France
| | - Noureddine Boujrad
- TREK, Institut de recherche en Santé Environnement et Travail (Irset), INSERM U1085, Université de Rennes 1, Campus de Beaulieu, SFR Biosit, 35042 Rennes cedex, France
| | - Farzad Pakdel
- TREK, Institut de recherche en Santé Environnement et Travail (Irset), INSERM U1085, Université de Rennes 1, Campus de Beaulieu, SFR Biosit, 35042 Rennes cedex, France
| | - Olivier Kah
- Team NEED, Institut de recherche en Santé Environnement et Travail (Irset), INSERM U1085, Université de Rennes 1, Campus de Beaulieu, SFR Biosit, 35042 Rennes cedex, France.
| | - François Brion
- Unité d'Ecotoxicologie in vitro et in vivo, Institut National de l'Environnement Industriel et des Risques (INERIS), BP 2, 60550 Verneuil-en-Halatte, France.
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Brander SM, Jeffries KM, Cole BJ, DeCourten BM, White JW, Hasenbein S, Fangue NA, Connon RE. Transcriptomic changes underlie altered egg protein production and reduced fecundity in an estuarine model fish exposed to bifenthrin. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2016; 174:247-60. [PMID: 26975043 DOI: 10.1016/j.aquatox.2016.02.014] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2015] [Revised: 02/15/2016] [Accepted: 02/18/2016] [Indexed: 05/15/2023]
Abstract
Pyrethroid pesticides are a class of insecticides found to have endocrine disrupting properties in vertebrates such as fishes and in human cell lines. Endocrine disrupting chemicals (EDCs) are environmental contaminants that mimic or alter the process of hormone signaling. In particular, EDCs that alter estrogen and androgen signaling pathways are of major concern for fishes because these EDCs may alter reproductive physiology, behavior, and ultimately sex ratio. Bifenthrin, a pyrethroid with escalating usage, is confirmed to disrupt estrogen signaling in several species of fish, including Menidia beryllina (inland silverside), an Atherinid recently established as a euryhaline model. Our main objective was to broadly assess the molecular and physiological responses of M. beryllina to the ng/L concentrations of bifenthrin typically found in the environment, with a focus on endocrine-related effects, and to discern links between different tiers of the biological hierarchy. As such, we evaluated the response of juvenile Menidia to bifenthrin using a Menidia-specific microarray, quantitative real-time polymerase chain reaction (qPCR) on specific endocrine-related genes of interest, and a Menidia-specific ELISA to the egg-coat protein choriogenin, to evaluate a multitude of molecular-level responses that would inform mechanisms of toxicity and any underlying causes of change at higher biological levels of organization. The sublethal nominal concentrations tested (0.5, 5 and 50ng/L) were chosen to represent the range of concentrations observed in the environment and to provide coverage of a variety of potential responses. We then employed a 21-day reproductive assay to evaluate reproductive responses to bifenthrin (at 0.5ng/L) in a separate group of adult M. beryllina. The microarray analysis indicated that bifenthrin influences a diverse suite of molecular pathways, from baseline metabolic processes to carcinogenesis. A more targeted examination of gene expression via qPCR demonstrated that bifenthrin downregulates a number of estrogen-related transcripts, particularly at the lowest exposure level. Choriogenin protein also decreased with exposure to increasing concentrations of bifenthrin, and adult M. beryllina exposed to 0.5ng/L had significantly reduced reproductive output (fertilized eggs per female). This reduction in fecundity is consistent with observed changes in endocrine-related gene expression and choriogenin production. Taken together, our results demonstrate that environmental concentrations of bifenthrin have potential to interfere with metabolic processes, endocrine signaling, and to decrease reproductive output.
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Affiliation(s)
- Susanne M Brander
- Biology & Marine Biology, University of North Carolina, Wilmington, 601 South College Road, Wilmington, NC 28403, United States.
| | - Ken M Jeffries
- Anatomy, Physiology & Cell Biology, School of Veterinary Medicine, University of California, Davis, One Shields Avenue, Davis, CA 95616, United States
| | - Bryan J Cole
- Anatomy, Physiology & Cell Biology, School of Veterinary Medicine, University of California, Davis, One Shields Avenue, Davis, CA 95616, United States
| | - Bethany M DeCourten
- Biology & Marine Biology, University of North Carolina, Wilmington, 601 South College Road, Wilmington, NC 28403, United States
| | - J Wilson White
- Biology & Marine Biology, University of North Carolina, Wilmington, 601 South College Road, Wilmington, NC 28403, United States
| | - Simone Hasenbein
- Anatomy, Physiology & Cell Biology, School of Veterinary Medicine, University of California, Davis, One Shields Avenue, Davis, CA 95616, United States
| | - Nann A Fangue
- Wildlife, Fish & Conservation Biology, University of California, Davis, One Shields Avenue, Davis, CA 95616, United States
| | - Richard E Connon
- Anatomy, Physiology & Cell Biology, School of Veterinary Medicine, University of California, Davis, One Shields Avenue, Davis, CA 95616, United States
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Qiu W, Zhao Y, Yang M, Farajzadeh M, Pan C, Wayne NL. Actions of Bisphenol A and Bisphenol S on the Reproductive Neuroendocrine System During Early Development in Zebrafish. Endocrinology 2016; 157:636-47. [PMID: 26653335 DOI: 10.1210/en.2015-1785] [Citation(s) in RCA: 142] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Bisphenol A (BPA) is a well-known environmental, endocrine-disrupting chemical, and bisphenol S (BPS) has been considered a safer alternative for BPA-free products. The present study aims to evaluate the impact of BPA and BPS on the reproductive neuroendocrine system during zebrafish embryonic and larval development and to explore potential mechanisms of action associated with estrogen receptor (ER), thyroid hormone receptor (THR), and enzyme aromatase (AROM) pathways. Environmentally relevant, low levels of BPA exposure during development led to advanced hatching time, increased numbers of GnRH3 neurons in both terminal nerve and hypothalamus, increased expression of reproduction-related genes (kiss1, kiss1r, gnrh3, lhβ, fshβ, and erα), and a marker for synaptic transmission (sv2). Low levels of BPS exposure led to similar effects: increased numbers of hypothalamic GnRH3 neurons and increased expression of kiss1, gnrh3, and erα. Antagonists of ER, THRs, and AROM blocked many of the effects of BPA and BPS on reproduction-related gene expression, providing evidence that those three pathways mediate the actions of BPA and BPS on the reproductive neuroendocrine system. This study demonstrates that alternatives to BPA used in the manufacture of BPA-free products are not necessarily safer. Furthermore, this is the first study to describe the impact of low-level BPA and BPS exposure on the Kiss/Kiss receptor system during development. It is also the first report of multiple cellular pathways (ERα, THRs, and AROM) mediating the effects of BPA and BPS during embryonic development in any species.
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Affiliation(s)
- Wenhui Qiu
- School of Environmental and Chemical Engineering (W.Q., M.Y., C.P.), Shanghai University, Shanghai 200444, China; and Department of Physiology (W.Q., Y.Z., M.F., N.L.W.), David Geffen School of Medicine at the University of California, Los Angeles, Los Angeles, California 90095
| | - Yali Zhao
- School of Environmental and Chemical Engineering (W.Q., M.Y., C.P.), Shanghai University, Shanghai 200444, China; and Department of Physiology (W.Q., Y.Z., M.F., N.L.W.), David Geffen School of Medicine at the University of California, Los Angeles, Los Angeles, California 90095
| | - Ming Yang
- School of Environmental and Chemical Engineering (W.Q., M.Y., C.P.), Shanghai University, Shanghai 200444, China; and Department of Physiology (W.Q., Y.Z., M.F., N.L.W.), David Geffen School of Medicine at the University of California, Los Angeles, Los Angeles, California 90095
| | - Matthew Farajzadeh
- School of Environmental and Chemical Engineering (W.Q., M.Y., C.P.), Shanghai University, Shanghai 200444, China; and Department of Physiology (W.Q., Y.Z., M.F., N.L.W.), David Geffen School of Medicine at the University of California, Los Angeles, Los Angeles, California 90095
| | - Chenyuan Pan
- School of Environmental and Chemical Engineering (W.Q., M.Y., C.P.), Shanghai University, Shanghai 200444, China; and Department of Physiology (W.Q., Y.Z., M.F., N.L.W.), David Geffen School of Medicine at the University of California, Los Angeles, Los Angeles, California 90095
| | - Nancy L Wayne
- School of Environmental and Chemical Engineering (W.Q., M.Y., C.P.), Shanghai University, Shanghai 200444, China; and Department of Physiology (W.Q., Y.Z., M.F., N.L.W.), David Geffen School of Medicine at the University of California, Los Angeles, Los Angeles, California 90095
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40
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Inagaki T, Smith N, Lee EK, Ramakrishnan S. Low dose exposure to Bisphenol A alters development of gonadotropin-releasing hormone 3 neurons and larval locomotor behavior in Japanese Medaka. Neurotoxicology 2015; 52:188-97. [PMID: 26687398 DOI: 10.1016/j.neuro.2015.12.003] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2015] [Revised: 11/24/2015] [Accepted: 12/04/2015] [Indexed: 11/30/2022]
Abstract
Accumulating evidence indicates that chronic low dose exposure to Bisphenol A (BPA), an endocrine disruptor, may disrupt normal brain development and behavior mediated by the gonadotropin-releasing hormone (GnRH) pathways. While it is known that GnRH neurons in the hypothalamus regulate reproductive physiology and behavior, functional roles of extra-hypothalamic GnRH neurons remain unclear. Furthermore, little is known whether BPA interacts with extra-hypothalamic GnRH3 neural systems in vulnerable developing brains. Here we examined the impact of low dose BPA exposure on the developing GnRH3 neural system, eye and brain growth, and locomotor activity in transgenic medaka embryos and larvae with GnRH3 neurons tagged with GFP. Fertilized eggs were collected daily and embryos/larvae were chronically exposed to 200ng/ml of BPA, starting at 1 day post fertilization (dpf). BPA significantly increased fluorescence intensity of the GnRH3-GFP neural population in the terminal nerve (TN) of the forebrain at 3dpf, but decreased the intensity at 5dpf, compared with controls. BPA advanced eye pigmentation without affecting eye and brain size development, and accelerated times to hatch. Following chronic BPA exposure, 20dpf larvae showed suppression of locomotion, both in distance covered and speed of movement (47% and 43% reduction, respectively). BPA-induced hypoactivity was accompanied by decreased cell body sizes of individual TN-GnRH3 neurons (14% smaller than those of controls), but not of non-GnRH3 neurons. These novel data demonstrate complex neurobehavioral effects of BPA on the development of extra-hypothalamic GnRH3 neurons in teleost fish.
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Affiliation(s)
- T Inagaki
- Department of Biology, Neuroscience program, University of Puget Sound, Tacoma, WA 98416, USA
| | - N Smith
- Department of Chemistry, University of Puget Sound, Tacoma, WA 98416, USA
| | - E K Lee
- Department of Chemistry, University of Puget Sound, Tacoma, WA 98416, USA
| | - S Ramakrishnan
- Department of Biology, Neuroscience program, University of Puget Sound, Tacoma, WA 98416, USA.
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Caulier M, Brion F, Chadili E, Turies C, Piccini B, Porcher JM, Guiguen Y, Hinfray N. Localization of steroidogenic enzymes and Foxl2a in the gonads of mature zebrafish (Danio rerio). Comp Biochem Physiol A Mol Integr Physiol 2015; 188:96-106. [PMID: 26099948 DOI: 10.1016/j.cbpa.2015.06.016] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Revised: 06/11/2015] [Accepted: 06/12/2015] [Indexed: 12/11/2022]
Abstract
In zebrafish, the identification of the cells expressing steroidogenic enzymes and their regulators is far from completely fulfilled though it could provide crucial information on the elucidation of the role of these enzymes. The aim of this study was to better characterize the expression pattern of steroidogenic enzymes involved in estrogen and androgen production (Cyp17-I, Cyp11c1, Cyp19a1a and Cyp19a1b) and one of their regulators (Foxl2a) in zebrafish gonads. By using immunohistochemistry, we localized the steroid-producing cells in mature zebrafish gonads and determined different expression patterns between males and females. All these steroidogenic enzymes and Foxl2a were detected both in the testis and ovary. In the testis, they were all localized both in Leydig and germ cells except Cyp19a1b which was only detected in germ cells. In the ovary, Cyp17-I, Cyp19a1a and Foxl2a were immunolocalized in both somatic and germ cells while Cyp19a1b was only detected in germ cells and Cyp11c1 in somatic cells. Moreover, Cyp19a1a and Foxl2a did not display exactly the same patterns of spatial localization but their expressions were correlated suggesting a possible regulation of cyp19a1a gene by Foxl2a in zebrafish. Comparative analysis revealed a dimorphic expression of Cyp11c1, Cyp19a1a, Cyp19a1b and Foxl2a between males and females. Overall, our study provides a detailed description of the expression of proteins involved in the biosynthesis of steroidal hormones at the cellular scale within gonads, which is critical to further elucidating the intimate roles of the enzymes and the use of the zebrafish as a model in the field of endocrinology.
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Affiliation(s)
- Morgane Caulier
- INERIS, Direction des Risques Chroniques, Pole VIVA, Unite d'ecotoxicologie in vitro et in vivo, BP2, 60550 Verneuil-en-Halatte, France
| | - François Brion
- INERIS, Direction des Risques Chroniques, Pole VIVA, Unite d'ecotoxicologie in vitro et in vivo, BP2, 60550 Verneuil-en-Halatte, France
| | - Edith Chadili
- INERIS, Direction des Risques Chroniques, Pole VIVA, Unite d'ecotoxicologie in vitro et in vivo, BP2, 60550 Verneuil-en-Halatte, France
| | - Cyril Turies
- INERIS, Direction des Risques Chroniques, Pole VIVA, Unite d'ecotoxicologie in vitro et in vivo, BP2, 60550 Verneuil-en-Halatte, France
| | - Benjamin Piccini
- INERIS, Direction des Risques Chroniques, Pole VIVA, Unite d'ecotoxicologie in vitro et in vivo, BP2, 60550 Verneuil-en-Halatte, France
| | - Jean-Marc Porcher
- INERIS, Direction des Risques Chroniques, Pole VIVA, Unite d'ecotoxicologie in vitro et in vivo, BP2, 60550 Verneuil-en-Halatte, France
| | - Yann Guiguen
- INRA, UR1037, Laboratoire de Physiologie et de Génomique des Poissons (LPGP), IFR140, Ouest-Genopole, F-35000 Rennes France
| | - Nathalie Hinfray
- INERIS, Direction des Risques Chroniques, Pole VIVA, Unite d'ecotoxicologie in vitro et in vivo, BP2, 60550 Verneuil-en-Halatte, France.
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Grimaldi M, Boulahtouf A, Delfosse V, Thouennon E, Bourguet W, Balaguer P. Reporter cell lines to evaluate the selectivity of chemicals for human and zebrafish estrogen and peroxysome proliferator activated γ receptors. Front Neurosci 2015; 9:212. [PMID: 26106289 PMCID: PMC4460427 DOI: 10.3389/fnins.2015.00212] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2014] [Accepted: 05/26/2015] [Indexed: 11/13/2022] Open
Abstract
Zebrafish is increasingly used as an animal model to study the effects of environmental nuclear receptors (NRs) ligands. As most of these compounds have only been tested on human NRs, it is necessary to measure their effects on zebrafish NRs. Estrogen receptors (ER) α and β and peroxysome proliferator activated receptor (PPAR) γ are main targets of environmental disrupting compounds (EDCs). In humans there are two distinct nuclear ERs (hERα and hERβ), whereas the zebrafish genome encodes three ERs, zfERα, zfERβ1, and zfERβ2. Only one isoform of PPARγ is expressed in both humans and zebrafish. In this review, we described reporter cell lines that we established to study the interaction of EDCs with human and zebrafish ERs and PPARγ. Using these cell lines, we observed that zfERs are thermo-sensitive while zfPPARγ is not. We also showed significant differences in the ability of environmental and synthetic ligands to modulate activation of zfERs and zfPPARγ in comparison to hERs and hPPARγ. Some environmental estrogens (bisphenol A, mycoestrogens) which are hER panagonists displayed greater potency for zfERα as compared to zfERβs. hERβ selective agonists (8βVE2, DPN, phytoestrogens) also displayed zfERα selectivity. Among hERα selective synthetic agonists, 16α-LE2 was the most zfERα selective compound. Almost all zfPPARγ environmental ligands (halogenated bisphenol A derivatives, phthalates, perfluorinated compounds) displayed similar affinity for human and zebrafish PPARγ while pharmaceutical hPPARγ agonists like thiazolidones are not recognized by zfPPARγ. Altogether, our studies show that all hERs and hPPARγ ligands do not control in a similar manner the transcriptional activity of zfERs and zfPPARγ and point out that care has to be taken in transposing the results obtained using the zebrafish as a model for human physiopathology.
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Affiliation(s)
- Marina Grimaldi
- Institut de Recherche en Cancérologie de MontpellierMontpellier, France
- Institut National de la Santé et de la Recherche Médicale U1194Montpellier, France
- Université MontpellierMontpellier, France
- Institut Reìgional du Cancer de MontpellierMontpellier, France
| | - Abdelhay Boulahtouf
- Institut de Recherche en Cancérologie de MontpellierMontpellier, France
- Institut National de la Santé et de la Recherche Médicale U1194Montpellier, France
- Université MontpellierMontpellier, France
- Institut Reìgional du Cancer de MontpellierMontpellier, France
| | - Vanessa Delfosse
- Institut National de la Santé et de la Recherche Médicale U1054Montpellier, France
- Centre National de la Recherche Scientifique UMR5048, Centre de Biochimie Structurale, Université MontpellierMontpellier, France
| | - Erwan Thouennon
- Institut de Recherche en Cancérologie de MontpellierMontpellier, France
- Institut National de la Santé et de la Recherche Médicale U1194Montpellier, France
- Université MontpellierMontpellier, France
- Institut Reìgional du Cancer de MontpellierMontpellier, France
| | - William Bourguet
- Institut National de la Santé et de la Recherche Médicale U1054Montpellier, France
- Centre National de la Recherche Scientifique UMR5048, Centre de Biochimie Structurale, Université MontpellierMontpellier, France
| | - Patrick Balaguer
- Institut de Recherche en Cancérologie de MontpellierMontpellier, France
- Institut National de la Santé et de la Recherche Médicale U1194Montpellier, France
- Université MontpellierMontpellier, France
- Institut Reìgional du Cancer de MontpellierMontpellier, France
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Beaudouin R, Goussen B, Piccini B, Augustine S, Devillers J, Brion F, Péry ARR. An individual-based model of zebrafish population dynamics accounting for energy dynamics. PLoS One 2015; 10:e0125841. [PMID: 25938409 PMCID: PMC4418570 DOI: 10.1371/journal.pone.0125841] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2014] [Accepted: 03/26/2015] [Indexed: 01/29/2023] Open
Abstract
Developing population dynamics models for zebrafish is crucial in order to extrapolate from toxicity data measured at the organism level to biological levels relevant to support and enhance ecological risk assessment. To achieve this, a dynamic energy budget for individual zebrafish (DEB model) was coupled to an individual based model of zebrafish population dynamics (IBM model). Next, we fitted the DEB model to new experimental data on zebrafish growth and reproduction thus improving existing models. We further analysed the DEB-model and DEB-IBM using a sensitivity analysis. Finally, the predictions of the DEB-IBM were compared to existing observations on natural zebrafish populations and the predicted population dynamics are realistic. While our zebrafish DEB-IBM model can still be improved by acquiring new experimental data on the most uncertain processes (e.g. survival or feeding), it can already serve to predict the impact of compounds at the population level.
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Affiliation(s)
- Rémy Beaudouin
- Unité Modèles pour l’Ecotoxicologie et la Toxicologie (METO), Institut National de l’Environnement Industriel et des Risques (INERIS), Verneuil en Halatte, France
- * E-mail:
| | - Benoit Goussen
- Unité Modèles pour l’Ecotoxicologie et la Toxicologie (METO), Institut National de l’Environnement Industriel et des Risques (INERIS), Verneuil en Halatte, France
| | - Benjamin Piccini
- Unité Ecotoxicologie in vitro et in vivo (ECOT), Institut National de l’Environnement Industriel et des Risques (INERIS), Verneuil en Halatte, France
| | - Starrlight Augustine
- Centre for Ocean Life, National Institute of Aquatic Resources, Technical University of Denmark, Charlottenlund, Denmark
| | | | - François Brion
- Unité Ecotoxicologie in vitro et in vivo (ECOT), Institut National de l’Environnement Industriel et des Risques (INERIS), Verneuil en Halatte, France
| | - Alexandre R. R. Péry
- Unité Modèles pour l’Ecotoxicologie et la Toxicologie (METO), Institut National de l’Environnement Industriel et des Risques (INERIS), Verneuil en Halatte, France
- AgroParisTech, Paris, France
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Chen MHC, Hsu LC, Wu JL, Yeh CW, Tsai JN, Hseu YC, Hsu LS. Exposure to benzidine caused apoptosis and malformation of telencephalon region in zebrafish. ENVIRONMENTAL TOXICOLOGY 2014; 29:1428-1436. [PMID: 23766236 DOI: 10.1002/tox.21873] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2013] [Revised: 04/16/2013] [Accepted: 05/03/2013] [Indexed: 06/02/2023]
Abstract
Exposure to benzidine has been known to induce human cancers, particularly bladder carcinomas. In this study, the zebrafish model was used to investigate the developmental toxicity of benzidine. Embryos at 6 h postfertilization (hpf) that were exposed to benzidine exhibited embryonic death in a dose- and time-dependent manner. Benzidine induced malformations in zebrafish, such as small brain development, shorter axes, and a slight pericardial edema. High concentrations (50, 100, and 200 µM) of benzidine triggered widespread apoptosis in the brain and dorsal neurons, as evidenced by acridine orange and terminal deoxynucleotidyl transferase-mediated dUTP nick end-labeling (TUNEL) assays. Real-time polymerase chain reaction analysis also showed that benzidine treatment affected p53, bax, and noxa expression. Decreases in specific brain markers, such as emx1 in the telencephalon, ngn1 in differentiated neurons, and otx2 in the midbrain, were observed in benzidine-treated embryos at 24 hpf. Conversely, no overt changes to pax2.1 expression in the midbrain-hindbrain boundary were found. Moreover, the use of Tg(HuC:GFP) zebrafish showed that benzidine caused a malformation of the telencephalon region. Our findings show that benzidine exposure triggers widespread apoptosis in the zebrafish brain and dorsal neurons, resulting in the development of an abnormal telencephalon.
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45
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Qin F, Wang X, Liu S, Zheng Y, Li M, Zhang Y, Wang Z. Gene expression profiling of key genes in hypothalamus-pituitary-gonad axis of rare minnow Gobiocypris rarus in response to EE2. Gene 2014; 552:8-17. [PMID: 25194895 DOI: 10.1016/j.gene.2014.09.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Revised: 08/28/2014] [Accepted: 09/03/2014] [Indexed: 11/18/2022]
Abstract
The 17α-ethinylestradiol (EE2), which could induce estrogenic effects, is found in different aquatic systems. The current study aimed to assess in vivo effects of short-term EE2 exposure on the transcriptional activity of genes in the brain and gonad tissues in order to characterize the mode of action of EE2 on the hypothalamus-pituitary-gonad axis in rare minnow (Gobiocypris rarus). The full length cDNAs of fshβ, lhβ, fshr and lhr were first characterized in G. rarus. The homology and phylogenetic analyses of the amino acid sequences revealed that these four genes share high identity in cyprinid fish. The tissue distribution analysis by qRT-PCR showed that fshβ and lhβ were mainly expressed in the brain and fshr and lhr were mainly expressed in gonads. Adult G. rarus was exposed to EE2 at 1, 5, 25 and 125 ng/L for 3 and 6 days and the expression of brain cyp19a1b, fshβ and lhβ, estrogen receptors (esr1, esr2a, and esr2b) and gonadal fshr, lhr and cyp19a1a were assessed. Cyp19a1b was significantly up-regulated in the brains of female exposed to EE2 at 1-125 ng/L for 6 days. The brain lhβ, but not fshβ was strongly suppressed in most EE2 exposure groups of both sexes. The brain esr2b was inhibited in both sexes exposed to EE2 at all of the four concentrations for 6 days. Esr2a was up-regulated in the females by 6-day EE2 treatment at 1 and 25 ng/L. The high responsiveness of brain lhβ and esr2s to EE2 and their significant correlation in both sexes suggested that the transcriptional activity of Esr2s could play key roles in modulation of lhβ expression via direct action on gonadotropic cells in response to EE2. In gonads, fshr was strongly inhibited by EE2 in males, while lhr was significantly stimulated by EE2 in females. Cyp19a1a was inhibited by EE2 in both sexes. The positive correlations of gene expressions of both fshr and lhr with cyp19a1a in testes suggest that the suppression of 17α-estradiol (E2) synthesis in testis by exogenous estrogen could mediate via both Fsh/Fshr and Lh/Lhr signaling in male G. rarus.
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Affiliation(s)
- Fang Qin
- College of Animal Science and Technology, Northwest A&F University, Shaanxi Key Laboratory of Molecular Biology for Agriculture, Yangling, Shaanxi 712100, China
| | - Xueqin Wang
- College of Animal Science and Technology, Northwest A&F University, Shaanxi Key Laboratory of Molecular Biology for Agriculture, Yangling, Shaanxi 712100, China
| | - Shaozhen Liu
- College of Animal Science and Technology, Northwest A&F University, Shaanxi Key Laboratory of Molecular Biology for Agriculture, Yangling, Shaanxi 712100, China
| | - Yao Zheng
- College of Animal Science and Technology, Northwest A&F University, Shaanxi Key Laboratory of Molecular Biology for Agriculture, Yangling, Shaanxi 712100, China
| | - Meng Li
- College of Animal Science and Technology, Northwest A&F University, Shaanxi Key Laboratory of Molecular Biology for Agriculture, Yangling, Shaanxi 712100, China
| | - Yingying Zhang
- College of Animal Science and Technology, Northwest A&F University, Shaanxi Key Laboratory of Molecular Biology for Agriculture, Yangling, Shaanxi 712100, China
| | - Zaizhao Wang
- College of Animal Science and Technology, Northwest A&F University, Shaanxi Key Laboratory of Molecular Biology for Agriculture, Yangling, Shaanxi 712100, China.
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46
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Fetter E, Krauss M, Brion F, Kah O, Scholz S, Brack W. Effect-directed analysis for estrogenic compounds in a fluvial sediment sample using transgenic cyp19a1b-GFP zebrafish embryos. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2014; 154:221-229. [PMID: 24927039 DOI: 10.1016/j.aquatox.2014.05.016] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2014] [Revised: 05/01/2014] [Accepted: 05/08/2014] [Indexed: 06/03/2023]
Abstract
Xenoestrogens may persist in the environment by binding to sediments or suspended particulate matter serving as long-term reservoir and source of exposure, particularly for organisms living in or in contact with sediments. In this study, we present for the first time an effect-directed analysis (EDA) for identifying estrogenic compounds in a sediment sample using embryos of a transgenic reporter fish strain. In the tg(cyp19a1b-GFP) transgenic zebrafish strain, the expression of GFP (green fluorescent protein) in the brain is driven by an oestrogen responsive element in the promoter of the cyp19a1b (aromatase) gene. The selected sediment sample of the Czech river Bilina had already been analysed in a previous EDA using the yeast oestrogen screening assay and had revealed fractions containing estrogenic compounds. When normal phase HPLC (high performance liquid chromatography) fractionation was used for the separation of the sediment sample, the biotest with transgenic fish embryos revealed two estrogenic fractions. Chemical analysis of candidate compounds in these sediment fractions suggested alkylphenols and estrone as candidate compounds responsible for the observed estrogenic effect. Alkylphenol concentrations could partially explain the estrogenicity of the fractions. However, xenoestrogens below the analytical detection limit or non-targeted estrogenic compounds have probably also contributed to the sample's estrogenic potency. The results indicated the suitability of the tg(cyp19a1b-GFP) fish embryo for an integrated chemical-biological analysis of estrogenic effects.
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Affiliation(s)
- Eva Fetter
- Department of Bioanalytical Ecotoxicology, Helmholtz Centre for Environmental Research - UFZ, Permoserstraße 15, 04318 Leipzig, Germany.
| | - Martin Krauss
- Department of Effect-Directed Analysis, Helmholtz Centre for Environmental Research - UFZ, Permoserstraße 15, 04318 Leipzig, Germany
| | - François Brion
- Unité d'écotoxicologie in vitro et in vivo, Direction des Risques Chroniques, Institut National de l'Environnement Industriel et des Risques (INERIS), BP 2, F-60550 Verneuil-en-Halatte, France
| | - Olivier Kah
- Research Institute for Environment, Health and Occupation, INSERM U1085, Biosit, Université de Rennes 1, Campus de Beaulieu, 35042 Rennes cedex, France
| | - Stefan Scholz
- Department of Bioanalytical Ecotoxicology, Helmholtz Centre for Environmental Research - UFZ, Permoserstraße 15, 04318 Leipzig, Germany
| | - Werner Brack
- Department of Effect-Directed Analysis, Helmholtz Centre for Environmental Research - UFZ, Permoserstraße 15, 04318 Leipzig, Germany
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47
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Aris AZ, Shamsuddin AS, Praveena SM. Occurrence of 17α-ethynylestradiol (EE2) in the environment and effect on exposed biota: a review. ENVIRONMENT INTERNATIONAL 2014; 69:104-19. [PMID: 24825791 DOI: 10.1016/j.envint.2014.04.011] [Citation(s) in RCA: 319] [Impact Index Per Article: 31.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2013] [Revised: 04/06/2014] [Accepted: 04/13/2014] [Indexed: 05/17/2023]
Abstract
17α-ethynylestradiol (EE2) is a synthetic hormone, which is a derivative of the natural hormone, estradiol (E2). EE2 is an orally bio-active estrogen, and is one of the most commonly used medications for humans as well as livestock and aquaculture activity. EE2 has become a widespread problem in the environment due to its high resistance to the process of degradation and its tendency to (i) absorb organic matter, (ii) accumulate in sediment and (iii) concentrate in biota. Numerous studies have reported the ability of EE2 to alter sex determination, delay sexual maturity, and decrease the secondary sexual characteristics of exposed organisms even at a low concentration (ng/L) by mimicking its natural analogue, 17β-estradiol (E2). Thus, the aim of this review is to provide an overview of the science regarding EE2, the concentration levels in the environment (water, sediment and biota) and summarize the effects of this compound on exposed biota at various concentrations, stage life, sex, and species. The challenges in respect of EE2 include the extension of the limited database on the EE2 pollution profile in the environment, its fate and transport mechanism, as well as the exposure level of EE2 for better prediction and definition revision of EE2 toxicity end points, notably for the purpose of environmental risk assessment.
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Affiliation(s)
- Ahmad Zaharin Aris
- Environmental Forensics Research Centre, Faculty of Environmental Studies, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia; Department of Environmental Sciences, Faculty of Environmental Studies, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
| | - Aida Soraya Shamsuddin
- Environmental Forensics Research Centre, Faculty of Environmental Studies, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
| | - Sarva Mangala Praveena
- Department of Environmental and Occupational Health, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
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48
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Aromatase, estrogen receptors and brain development in fish and amphibians. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2014; 1849:152-62. [PMID: 25038582 DOI: 10.1016/j.bbagrm.2014.07.002] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2014] [Revised: 06/19/2014] [Accepted: 07/07/2014] [Indexed: 12/20/2022]
Abstract
Estrogens affect brain development of vertebrates, not only by impacting activity and morphology of existing circuits, but also by modulating embryonic and adult neurogenesis. The issue is complex as estrogens can not only originate from peripheral tissues, but also be locally produced within the brain itself due to local aromatization of androgens. In this respect, teleost fishes are quite unique because aromatase is expressed exclusively in radial glial cells, which represent pluripotent cells in the brain of all vertebrates. Expression of aromatase in the brain of fish is also strongly stimulated by estrogens and some androgens. This creates a very intriguing positive auto-regulatory loop leading to dramatic aromatase expression in sexually mature fish with elevated levels of circulating steroids. Looking at the effects of estrogens or anti-estrogens in the brain of adult zebrafish showed that estrogens inhibit rather than stimulate cell proliferation and newborn cell migration. The functional meaning of these observations is still unclear, but these data suggest that the brain of fish is experiencing constant remodeling under the influence of circulating steroids and brain-derived neurosteroids, possibly permitting a diversification of sexual strategies, notably hermaphroditism. Recent data in frogs indicate that aromatase expression is limited to neurons and do not concern radial glial cells. Thus, until now, there is no other example of vertebrates in which radial progenitors express aromatase. This raises the question of when and why these new features were gained and what are their adaptive benefits. This article is part of a Special Issue entitled: Nuclear receptors in animal development.
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49
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Mills LJ, Gutjahr-Gobell RE, Zaroogian GE, Horowitz DB, Laws SC. Modulation of aromatase activity as a mode of action for endocrine disrupting chemicals in a marine fish. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2014; 147:140-150. [PMID: 24418745 DOI: 10.1016/j.aquatox.2013.12.023] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2013] [Revised: 12/17/2013] [Accepted: 12/22/2013] [Indexed: 06/03/2023]
Abstract
The steroidogenic enzyme aromatase catalyzes the conversion of androgens to estrogens and therefore plays a central role in reproduction. In contrast to most vertebrates, teleost fish have two distinct forms of aromatase. Because brain aromatase activity in fish is up to 1000 times that in mammals, fish may be especially susceptible to negative effects from environmental endocrine-disrupting chemicals (EDCs) that impact aromatase activity. In this study, the effects of estradiol (E2), ethynylestradiol (EE2), octylphenol (OP), and androstatrienedione (ATD) on reproduction and aromatase activity in brains and gonads from the marine fish cunner (Tautogolabrus adspersus) was investigated. The purpose of the study was to explore the relationship between changes in aromatase activity and reproductive output in a marine fish, as well as compare aromatase activity to two commonly used indicators of EDC exposure, plasma vitellogenin (VTG) and gonadosomatic index (GSI). Results with E2, EE2, and ATD indicate that aromatase activity in cunner brain and ovary are affected differently by exposure to these EDCs. In the case of E2 and EE2, male brain aromatase activity was signficantly increased by these treatments, female brain aromatase activity was unaffected, and ovarian aromatase activity was significantly decreased. Treatment with the aromatase inhibitor ATD resulted in significantly decreased aromatase activity in male and female brain, but had no significant impact on ovarian aromatase activity. Regardless of test chemical, a decrease or an increase in male brain aromatase activity relative to controls was associated with decreased egg production in cunner and was also correlated with significant changes in GSI in both sexes. E2 and EE2 significantly elevated plasma VTG in males and females, while ATD had no significant effect. Treatment of cunner with OP had no significant effect on any measured endpoint. Overall, results with these exposures indicate EDCs that impact aromatase activity also affect reproductive output in spawning cunner.
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Affiliation(s)
- Lesley J Mills
- United States Environmental Protection Agency, Office of Research and Development, National Health and Environmental Effects Research Laboratory, Atlantic Ecology Division, 27 Tarzwell Dr., Narragansett, RI 02882, United States.
| | - Ruth E Gutjahr-Gobell
- United States Environmental Protection Agency, Office of Research and Development, National Health and Environmental Effects Research Laboratory, Atlantic Ecology Division, 27 Tarzwell Dr., Narragansett, RI 02882, United States
| | - Gerald E Zaroogian
- United States Environmental Protection Agency, Office of Research and Development, National Health and Environmental Effects Research Laboratory, Atlantic Ecology Division, 27 Tarzwell Dr., Narragansett, RI 02882, United States
| | - Doranne Borsay Horowitz
- United States Environmental Protection Agency, Office of Research and Development, National Health and Environmental Effects Research Laboratory, Atlantic Ecology Division, 27 Tarzwell Dr., Narragansett, RI 02882, United States
| | - Susan C Laws
- United States Environmental Protection Agency, Office of Research and Development, National Health and Environmental Effects Research Laboratory, Toxicity Assessment Division, Research Triangle Park, NC 27711, United States
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50
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Péry ARR, Devillers J, Brochot C, Mombelli E, Palluel O, Piccini B, Brion F, Beaudouin R. A physiologically based toxicokinetic model for the zebrafish Danio rerio. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2014; 48:781-90. [PMID: 24295030 DOI: 10.1021/es404301q] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Zebrafish (Danio rerio) is a widely used model for toxicological studies, in particular those related to investigations on endocrine disruption. The development and regulatory use of in vivo and in vitro tests based on this species can be enhanced by toxicokinetic modeling. For this reason, we propose a physiologically based toxicokinetic (PBTK) model for zebrafish describing the uptake and disposition of organic chemicals. The model is based on literature data on zebrafish, other cyprinidae and other fish families, new experimental physiological information (volumes, lipids and water contents) obtained from zebrafish, and chemical-specific parameters predicted by generic models. The relevance of available models predicting the latter parameters was evaluated with respect to gill uptake and partition coefficients in zebrafish. This evaluation benefited from the fact that the influence of confounding factors such as body weight and temperature on ventilation rate was included in our model. The predictions for six chemicals (65 data points) yielded by our PBTK model were compared to available toxicokinetics data for zebrafish and 88% of them were within a factor of 5 of the corresponding experimental values. Sensitivity analysis highlighted that the 1-octanol/water partition coefficient, the metabolism rate, and all the parameters that enable the prediction of assimilation efficiency and partitioning of chemicals need to be precisely determined in order to allow an effective toxicokinetic modeling.
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Affiliation(s)
- Alexandre R R Péry
- Unité Modèles pour l'Écotoxicologie et la Toxicologie (METO), INERIS, Parc Technologique Alata, BP2, 60550 Verneuil-en-Halatte, France
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