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Islam R, Yu RMK, O'Connor WA, Lin X, Lai KP, Leusch FDL, MacFarlane GR. Intergenerational toxicity of 17α-ethinylestradiol (EE2): Effects of parental exposure on early larval development and transcriptomic profiles in the Sydney rock oyster, Saccostrea glomerata. JOURNAL OF HAZARDOUS MATERIALS 2024; 475:134876. [PMID: 38870858 DOI: 10.1016/j.jhazmat.2024.134876] [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: 03/10/2024] [Revised: 06/07/2024] [Accepted: 06/09/2024] [Indexed: 06/15/2024]
Abstract
This study exposed adult Sydney rock oysters, of either sex or both, to the synthetic estrogen 17α-ethinylestradiol (EE2) at 50 ng/L for 21 days, followed by an examination of developmental endpoints and transcriptomic responses in unexposed larvae. Reduced survival was observed at 1 day post-fertilisation (dpf) in larvae from bi-parental exposure (FTMT). Motile larvae at 2 dpf were fewer from maternal (FTMC), paternal (FCMT), and FTMT exposures. Additionally, shell length at 7 dpf decreased in larvae from FTMC and FTMT parents. RNA sequencing (RNA-seq) revealed 1064 differentially expressed genes (DEGs) in 1-dpf larvae from FTMT parents, while fewer DEGs were detected in larvae from FTMC and FCMT parents, with 258 and 7, respectively. GO and KEGG analyses showed significant enrichment of DEGs in diverse terms and pathways, with limited overlap among treatment groups. IPA results indicated potential inhibition of pathways regulating energy production, larval development, transcription, and detoxification of reactive oxygen species in FTMT larvae. qRT-PCR validation confirmed significant downregulation of selected DEGs involved in these pathways and relevant biological processes, as identified in the RNA-seq dataset. Overall, our results suggest that the intergenerational toxicity of EE2 is primarily maternally transmitted, with bi-parental exposure amplifying these effects.
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Affiliation(s)
- Rafiquel Islam
- School of Environmental and Life Sciences, The University of Newcastle, Callaghan, NSW 2308, Australia; Department of Applied Chemistry and Chemical Engineering, Islamic University, Kushtia 7003, Bangladesh
| | - Richard Man Kit Yu
- School of Environmental and Life Sciences, The University of Newcastle, Callaghan, NSW 2308, Australia
| | - Wayne A O'Connor
- New South Wales Department of Primary Industries, Port Stephens Fisheries Institute, Taylors Beach, NSW 2316, Australia
| | - Xiao Lin
- Department of Psychiatry, Icahn School of Medicine at Mount Sinai, New York, USA
| | - Keng Po Lai
- Key Laboratory of Environmental Pollution and Integrative Omics, Education Department of Guangxi Zhuang Autonomous Region, Guilin Medical University, Guilin, China
| | - Frederic D L Leusch
- Australian Rivers Institute, School of Environment and Science, Griffith University, QLD 4222, Australia
| | - Geoff R MacFarlane
- School of Environmental and Life Sciences, The University of Newcastle, Callaghan, NSW 2308, Australia.
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Harayashiki CAY, Rodrigues CC, Rocha TL. Multi- and transgenerational effects of environmental chemicals on mollusks: An underexplored experimental design in aquatic (eco)toxicological studies. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2024; 351:124058. [PMID: 38685557 DOI: 10.1016/j.envpol.2024.124058] [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: 01/12/2024] [Revised: 04/24/2024] [Accepted: 04/25/2024] [Indexed: 05/02/2024]
Abstract
(Eco)toxicological studies frequently evaluate the effects of chemicals in one life stage of organisms, but the use of these outcomes can only partially estimate populational effects. In this regard, multi- and/or transgenerational studies should be performed in order to provide information on contaminant effects in a populational functioning context. The present review aimed to summarize and critically evaluate the current knowledge regarding multi- and/or transgenerational effects of traditional and emerging environmental chemicals on mollusks. Results showed that these kinds of studies were performed in aquatic mollusks (bivalve and gastropod), being Gastropoda the mollusk Class most frequently studied. Additionally, freshwater species and multigenerational studies were more common for this class. For the Bivalvia class, only marine species were evaluated, and transgenerational exposure was more commonly assessed. The effects were reported for 15 species, highlighting the marine bivalves Crassostrea gigas and Saccostrea glomerata, and the freshwater gastropod Lymnaea stagnalis. Multi- and transgenerational effects were described for 8 environmental chemical groups, mainly metals, pesticides, and pharmaceuticals. In general, multi- and transgenerational exposure induced biometric, developmental, and reproductive impairments in mollusks, indicating that environmental chemicals might lead to generational impairments, reduced population growth and reproductive capacity, and decreased fitness. The current study indicated that bivalves and gastropods are suitable organism models to assess the multi- and transgenerational adverse effects induced by traditional and emerging environmental chemicals.
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Affiliation(s)
- Cyntia Ayumi Yokota Harayashiki
- Laboratory of Environmental Biotechnology and Ecotoxicology (LaBAE), Institute of Tropical Pathology and Public Health, Federal University of Goiás, Goiânia, Goiás, Brazil.
| | - Cândido Carvalho Rodrigues
- Laboratory of Environmental Biotechnology and Ecotoxicology (LaBAE), Institute of Tropical Pathology and Public Health, Federal University of Goiás, Goiânia, Goiás, Brazil; Environmental Metallomics Laboratory, Department of Biological Sciences, University of Québec at Montréal (UQAM), Montréal, QC, H2X 1Y4, Canada
| | - Thiago Lopes Rocha
- Laboratory of Environmental Biotechnology and Ecotoxicology (LaBAE), Institute of Tropical Pathology and Public Health, Federal University of Goiás, Goiânia, Goiás, Brazil
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Nobre CR, Moreno BB, Alves AV, Fontes MK, Campos BGD, Silva LFD, Maranho LA, Duarte LFDA, Abessa DMDS, Choueri RB, Gusso-Choueri PK, Pereira CDS. Microplastics and 17α Ethinylestradiol: How Do Different Aquatic Invertebrates Respond to This Combination of Contaminants? TOXICS 2024; 12:319. [PMID: 38787099 PMCID: PMC11125900 DOI: 10.3390/toxics12050319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2024] [Revised: 04/22/2024] [Accepted: 04/25/2024] [Indexed: 05/25/2024]
Abstract
The synthetic hormone 17α ethinyl estradiol (EE2) is a molecule widely used in female contraceptives and recognized as a contaminant of attention (Watch List) in the European Union due to its high consumption, endocrine effects and occurrence in aquatic environments. Its main source of introduction is domestic sewage where it can be associated with other contaminants such as microplastics (MPs). Due to their characteristics, they can combine with each other and exacerbate their isolated effects on biota. This study evaluated the combined effects of microplastics (MPs) and 17α ethinylestradiol (EE2) on two tropical estuarine invertebrate species: Crassostrea gasar and Ucides cordatus. Polyethylene particles were spiked with EE2 and organisms were exposed to three treatments, categorized into three groups: control group (C), virgin microplastics (MPs), and spiked microplastics with EE2 (MPEs). All treatments were evaluated after 3 and 7 days of exposure. Oysters exhibited changes in phase 2 enzymes and the antioxidant system, oxidative stress in the gills, and reduced lysosomal membrane stability after exposure to MPs and MPEs. Crabs exposed to MPs and MPEs after seven days showed changes in phase 1 enzymes in the gills and changes in phases 1 and 2 enzymes in the hepatopancreas, such as disturbed cellular health. The combined effects of microplastics and EE2 increased the toxicity experienced by organisms, which may trigger effects at higher levels of biological organization, leading to ecological disturbances in tropical coastal ecosystems.
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Affiliation(s)
- Caio Rodrigues Nobre
- Department of Marine Sciences, Federal University of São Paulo, Santos Campus (UNIFESP-Santos), Rua Maria Máximo, 168, Santos 11030-100, Brazil
- Biosciences Institute, São Paulo State University (UNESP), Litoral Paulista Campus, Praça Infante Dom Henrique, s/n, Parque Bitaru, São Vicente 11330-900, Brazil
| | - Beatriz Barbosa Moreno
- Department of Marine Sciences, Federal University of São Paulo, Santos Campus (UNIFESP-Santos), Rua Maria Máximo, 168, Santos 11030-100, Brazil
| | - Aline Vecchio Alves
- Department of Marine Sciences, Federal University of São Paulo, Santos Campus (UNIFESP-Santos), Rua Maria Máximo, 168, Santos 11030-100, Brazil
| | - Mayana Karoline Fontes
- Biosciences Institute, São Paulo State University (UNESP), Litoral Paulista Campus, Praça Infante Dom Henrique, s/n, Parque Bitaru, São Vicente 11330-900, Brazil
| | - Bruno Galvão de Campos
- Biosciences Institute, São Paulo State University (UNESP), Litoral Paulista Campus, Praça Infante Dom Henrique, s/n, Parque Bitaru, São Vicente 11330-900, Brazil
| | - Leticia Fernanda da Silva
- Biosciences Institute, São Paulo State University (UNESP), Litoral Paulista Campus, Praça Infante Dom Henrique, s/n, Parque Bitaru, São Vicente 11330-900, Brazil
| | - Luciane Alves Maranho
- Morphofunctional Laboratory, University of Ribeirão Preto (UNAERP), Avenida Dom Pedro I, 3.300, Guarujá 11440-003, Brazil
| | | | - Denis Moledo de Souza Abessa
- Biosciences Institute, São Paulo State University (UNESP), Litoral Paulista Campus, Praça Infante Dom Henrique, s/n, Parque Bitaru, São Vicente 11330-900, Brazil
| | - Rodrigo Brasil Choueri
- Department of Marine Sciences, Federal University of São Paulo, Santos Campus (UNIFESP-Santos), Rua Maria Máximo, 168, Santos 11030-100, Brazil
| | - Paloma Kachel Gusso-Choueri
- Department of Ecotoxicology, Santa Cecília University (UNISANTA), Rua Oswaldo Cruz, 266, Santos 11045-907, Brazil
| | - Camilo Dias Seabra Pereira
- Department of Marine Sciences, Federal University of São Paulo, Santos Campus (UNIFESP-Santos), Rua Maria Máximo, 168, Santos 11030-100, Brazil
- Department of Ecotoxicology, Santa Cecília University (UNISANTA), Rua Oswaldo Cruz, 266, Santos 11045-907, Brazil
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Katsiadaki I, Schwarz TI, Cousins ARO, Scott AP. The Uptake of Ethinyl-Estradiol and Cortisol From Water by Mussels ( Mytilus spp.). Front Endocrinol (Lausanne) 2021; 12:794623. [PMID: 34975764 PMCID: PMC8714933 DOI: 10.3389/fendo.2021.794623] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Accepted: 11/26/2021] [Indexed: 12/12/2022] Open
Abstract
Previous toxicokinetic studies have shown that mussels (Mytilus spp.) can readily absorb the three main mammalian sex steroids, estradiol (E2), testosterone (T) and progesterone (P) from water. They also have a strong ability to store E2 and the 5α-reduced metabolites of T and P in the form of fatty acid esters. These esters were shown to have half-lives that were measured in weeks (i.e. they were not subject to fast depuration). The present study looked at the toxicokinetic profile of two other common steroids that are found in water, the potent synthetic oestrogen, (ethinyl-estradiol) (EE2; one of the two components of 'the pill'), and cortisol, a natural stress steroid in vertebrates. In the first three hours of uptake, tritiated EE2 was found to be taken up at a similar rate to tritiated E2. However, the levels in the water plateaued sooner than E2. The ability of the animals to both esterify and sulphate EE2 was found to be much lower than E2, but nevertheless did still take place. After 24 h of exposure, the majority of radiolabelled EE2 in the animals was present in the form of free steroid, contrary to E2, which was esterified. This metabolism was reflected in a much lower half-life (of only 15 h for EE2 in the mussels as opposed to 8 days for E2 and >10 days for T and P). Intriguingly, hardly any cortisol (in fact none at all in one of the experiments) was absorbed by the mussels. The implications of this finding in both toxicokinetic profiling and evolutionary significance (why cortisol might have evolved as a stress steroid in bony fishes) are discussed.
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Affiliation(s)
- Ioanna Katsiadaki
- Centre for Environment, Fisheries and Aquaculture Science, Weymouth Laboratory, Weymouth, United Kingdom
- *Correspondence: Ioanna Katsiadaki,
| | - Tamar I. Schwarz
- Centre for Environment, Fisheries and Aquaculture Science, Weymouth Laboratory, Weymouth, United Kingdom
| | - Alex R. O. Cousins
- Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory, Lowestoft, United Kingdom
| | - Alexander P. Scott
- Centre for Environment, Fisheries and Aquaculture Science, Weymouth Laboratory, Weymouth, United Kingdom
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Islam R, Kit Yu RM, O'Connor WA, Anh Tran TK, Andrew-Priestley M, Leusch FDL, MacFarlane GR. Parental exposure to the synthetic estrogen 17α-ethinylestradiol (EE2) affects offspring development in the Sydney rock oyster, Saccostrea glomerata. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 266:114994. [PMID: 32653741 DOI: 10.1016/j.envpol.2020.114994] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Revised: 06/01/2020] [Accepted: 06/06/2020] [Indexed: 05/14/2023]
Abstract
Very little is currently known regarding the effects of estrogenic endocrine disrupting chemicals on embryonic and larval development in molluscs, nor the potential effects of parental (F0) exposure on resultant F1 offspring. In this study, we assessed the embryotoxic impacts of exposure to environmentally relevant concentrations of the synthetic estrogen, 17α-ethinylestradiol (EE2), to male and female parents (50 ng/L) and their offspring (5 and 50 ng/L) in the native Australian Sydney rock oyster, Saccostrea glomerata. There were no detectable effects of parental exposure on fertilisation success, proportions of early larval (F1) morphs and unfertilised eggs. Offspring impacts were evidenced in terms of developmental delays, with decreased percentages of D-veligers retained by 45 μm mesh, along with a reduction of swimming capabilities of larvae at 2 days post-fertilisation (dpf) when both parents had been exposed to 50 ng/L EE2. Although no significant parental effects were found on the survival of F1 larvae at 9 dpf, retardation of shell growth was observed on F1 larvae in treatments where both parents had been exposed to 50 ng/L EE2. Subsequent larval exposure from 2 to 9 dpf caused declines in survival and reduction of shell length in F1 larvae at both 5 and 50 ng/L EE2 across all parental exposure treatments. Collectively, parental EE2 imparts effects on offspring in terms of retardation of larval development, and subsequent offspring exposure to EE2 further exacerbates impacts to development. Future research should aim to understand the potential mechanisms of EE2 induced toxicity and its transmission resulting in altered phenotypes of the F1 generation.
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Affiliation(s)
- Rafiquel Islam
- School of Environmental and Life Sciences, The University of Newcastle, Callaghan, NSW 2308, Australia; Department of Applied Chemistry and Chemical Engineering, Islamic University, Kushtia 7003, Bangladesh
| | - Richard Man Kit Yu
- School of Environmental and Life Sciences, The University of Newcastle, Callaghan, NSW 2308, Australia
| | - Wayne A O'Connor
- New South Wales Department of Primary Industries, Port Stephens Fisheries Institute, Taylors Beach, NSW 2316, Australia
| | - Thi Kim Anh Tran
- School of Environmental and Life Sciences, The University of Newcastle, Callaghan, NSW 2308, Australia; School of Agriculture and Resources, Vinh University, Viet Nam
| | | | - Frederic D L Leusch
- Australian Rivers Institute, School of Environment and Science, Griffith University, QLD 4222, Australia
| | - Geoff R MacFarlane
- School of Environmental and Life Sciences, The University of Newcastle, Callaghan, NSW 2308, Australia.
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Liu YY, Lin YS, Yen CH, Miaw CL, Chen TC, Wu MC, Hsieh CY. Identification, contribution, and estrogenic activity of potential EDCs in a river receiving concentrated livestock effluent in Southern Taiwan. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 636:464-476. [PMID: 29709864 DOI: 10.1016/j.scitotenv.2018.04.031] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Revised: 04/02/2018] [Accepted: 04/03/2018] [Indexed: 06/08/2023]
Abstract
We assessed 22 selected endocrine-disrupting compounds (EDCs) and other emerging, potentially endocrine-active compounds with estrogenic activity from the waters of the Wuluo River, southern Taiwan. This watershed receives high amounts of livestock and untreated household wastewaters. The river is surrounded by concentrated animal feedlot operations (CAFOs). River water samples were analyzed for selected compounds by liquid chromatography-tandem mass spectrometry (LC-MS/MS), T47D-KBluc reporter gene assay, and E-screen cell proliferation in vitro bioassay. Total concentrations of ∑alkylphenolic compounds (bisphenol A, 4-nonylphenol, t-nonylphenol, octylphenol, nonylphenol mono-ethoxylate, nonylphenol di-ethoxylate) were much higher than ∑estrogens (estrone, 17 β-estradiol, estriol, 17ß-ethynylestradiol, diethylstilbestrol), ∑preservatives (methyl paraben, ethyl paraben, propyl paraben, butyl paraben), ∑UV-filters (benzophenone, methyl benzylidene camphor, benzophenone-3), ∑antimicrobials (triclocarben, triclosan, chloroxylenol), and an insect repellent (diethyltoluamide) over four seasonal sampling periods. The highest concentration was found for bisphenol A with a mean of 302 ng/L. However, its contribution to estrogenic activity was not significant due to its relatively low estrogenic potency. Lower detection rates were found for BP, EE2, TCS, and PCMX, while DES and EP were not detected. E1 and E2 levels in raw water samples were 50% higher than the predicted no-effect concentrations (PNEC) for aquatic organisms of 6 and 2 ng/L, respectively. The potency of estrogenic activity ranged from 11.7 to 190.1 ng/L E2T47D-Kbluc and 6.63 to 84.5 ng/L E2E-Screen for extracted samples. Importantly, estrone contributed 50% of the overall activity in 60% and 44% of the samples based on T47D-KBluc and MCF-7 bioassays, followed by 17 ß-estradiol, highlighting the importance of total steroid estrogen loading. This study demonstrates that the estrogenic activity of target chemicals was comparable to levels found in different countries worldwide. More intense wastewater treatment is required in areas of intensive agriculture in order to prevent adverse impacts on the ambient environment and aquatic ecosystems.
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Affiliation(s)
- Yung-Yu Liu
- Department of Environmental Science and Engineering, National Pingtung University of Science and Technology, Pingtung 91201, Taiwan, ROC
| | - Yi-Siou Lin
- Department of Environmental Science and Engineering, National Pingtung University of Science and Technology, Pingtung 91201, Taiwan, ROC
| | - Chia-Hung Yen
- Department of Biological Science and Technology, National Pingtung University of Science and Technology, Pingtung 91201, Taiwan, ROC
| | - Chang-Ling Miaw
- Department of Nursing, Tajen University, Pingtung 90741, Taiwan, ROC
| | - Ting-Chien Chen
- Department of Environmental Science and Engineering, National Pingtung University of Science and Technology, Pingtung 91201, Taiwan, ROC
| | - Meng-Chun Wu
- Department of Environmental Science and Engineering, National Pingtung University of Science and Technology, Pingtung 91201, Taiwan, ROC
| | - Chi-Ying Hsieh
- Department of Environmental Science and Engineering, National Pingtung University of Science and Technology, Pingtung 91201, Taiwan, ROC.
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Bioactive Compounds Isolated from Neglected Predatory Marine Gastropods. Mar Drugs 2018; 16:md16040118. [PMID: 29621159 PMCID: PMC5923405 DOI: 10.3390/md16040118] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2018] [Revised: 03/21/2018] [Accepted: 03/29/2018] [Indexed: 12/19/2022] Open
Abstract
A diverse range of predatory marine gastropods produce toxins, yet most of these molecules remain uncharacterized. Conus species have received the most attention from researchers, leading to several conopeptides reaching clinical trials. This review aims to summarize what is known about bioactive compounds isolated from species of neglected marine gastropods, especially in the Turridae, Terebridae, Babyloniidae, Muricidae, Buccinidae, Colubrariidae, Nassariidae, Cassidae, and Ranellidae families. Multiple species have been reported to contain bioactive compounds with potential toxic activity, but most of these compounds have not been characterized or even clearly identified. The bioactive properties and potential applications of echotoxins and related porins from the Ranellidae family are discussed in more detail. Finally, the review concludes with a call for research on understudied species.
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Po BHK, Chiu JMY. Transgenerational impairments of reproduction and development of the marine invertebrate Crepidula onyx resulted from long-term dietary exposure of 2,2',4,4'-tetrabromodiphenyl ether (BDE-47). ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2018; 235:730-738. [PMID: 29339342 DOI: 10.1016/j.envpol.2017.12.087] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Revised: 12/20/2017] [Accepted: 12/22/2017] [Indexed: 06/07/2023]
Abstract
Polybrominated diphenyl ethers have become ubiquitous in the environment and elevated concentrations have often been found in marine organisms. Using the gastropod Crepidula onyx as a study model, this multigenerational study sets out to test the hypotheses that 1) parental dietary exposure to environmentally realistic levels of 2,2',4,4'-tetrabrominated diphenyl ether (BDE-47) would lead to transgenerational impairments on fitness traits of marine invertebrates, and 2) the organisms might develop adaptation/acclimation after exposure for one or more generations. F0 generation of C. onyx was fed with the dinoflagellate Isochrysis galbana encapsulated with two concentrations of BDE-47 (1.78 and 16.0 ng million cells-1, respectively), and half of the F1 offspring from the higher concentration treatment was returned to control condition (transgenerational group), while the other half received BDE-47 treatment continuously (continuous treatment group). Bioaccumulation and maternal transfer of BDE-47 were evident in all life stages of the F0 generation and in F1 eggs, respectively. Exposure to BDE-47 reduced fecundity, delayed sexual maturity, and impeded embryonic development in F0 to F2. In particular, developmental toxicity of F2 embryos was apparent in the transgenerational group, but not in the continuous treatment group, even when BDE-47 was not detected in the F2 embryos nor in their mothers and they have never been exposed to the chemical. This study also suggested that the offspring might have developed adaptation/acclimation to the exposure of BDE-47 within two generations of exposure, and that the physiological alterations associated with acclimation/adaptation might have hindered the normal larval development under a stress free condition. These findings highlighted the need for long-term multigenerational studies in the ecological risk assessment of chemicals alike.
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Affiliation(s)
- Beverly H K Po
- Department of Biology, Hong Kong Baptist University, Hong Kong SAR, China; School of Biological Sciences, University of Hong Kong, Hong Kong SAR, China
| | - Jill M Y Chiu
- Department of Biology, Hong Kong Baptist University, Hong Kong SAR, China.
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9
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Hultin CL, Hallgren P, Hansson MC. Estrogen receptor genes in gastropods: phylogenetic divergence and gene expression responses to a synthetic estrogen. Comp Biochem Physiol C Toxicol Pharmacol 2016; 189:17-21. [PMID: 27426037 DOI: 10.1016/j.cbpc.2016.07.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Revised: 06/02/2016] [Accepted: 07/12/2016] [Indexed: 11/21/2022]
Abstract
Endocrine disrupting chemicals (EDCs) have the potential to affect development and reproduction in gastropods. However, one is today lacking basic understanding of the Molluscan endocrine system and one can therefore not fully explain these EDC-induced affects. Furthermore, only a few genes that potentially may be connected to the endocrine system have been sequenced in gastropods. An example is the estrogen receptor gene (er) that have been identified in a restricted number of freshwater and marine gastropods. Here, we have identified a new partial coding sequence of an estrogen receptor gene (er) in the European common heterobranch Radix balthica. The following phylogenetic analysis divided the ers of heterobranchs and ceanogastropods in two branches. Furthermore, exposure to the synthetic estrogen 17α-ethinylestradiol (EE2) showed that exposure could significantly affect er expression level in the heterobranch R. balthica. This paper is the first that phylogenetically compares gastropods' er, basal er expression profiles, and transcriptional estrogenic responses in gastropods from two different evolutionary groups.
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Affiliation(s)
- Cecilia L Hultin
- Centre for Environmental and Climate Research (CEC), Lund University, Sölvegatan 37, SE-22362 Lund, Sweden.
| | - Per Hallgren
- Department of Biology, Lund University, Sölvegatan 37, SE-22362 Lund, Sweden
| | - Maria C Hansson
- Centre for Environmental and Climate Research (CEC), Lund University, Sölvegatan 37, SE-22362 Lund, Sweden
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