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Pascuali N, Pu Y, Waye AA, Pearl S, Martin D, Sutton A, Shikanov A, Veiga-Lopez A. Evaluation of Lipids and Lipid-Related Transcripts in Human and Ovine Theca Cells and an in Vitro Mouse Model Exposed to the Obesogen Chemical Tributyltin. ENVIRONMENTAL HEALTH PERSPECTIVES 2024; 132:47009. [PMID: 38630605 PMCID: PMC11023052 DOI: 10.1289/ehp13955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Revised: 02/22/2024] [Accepted: 03/18/2024] [Indexed: 04/19/2024]
Abstract
BACKGROUND Exposure to obesogenic chemicals has been reported to result in enhanced adipogenesis, higher adipose tissue accumulation, and reduced ovarian hormonal synthesis and follicular function. We have reported that organotins [tributyltin (TBT) and triphenyltin (TPT)] dysregulate cholesterol trafficking in ovarian theca cells, but, whether organotins also exert lipogenic effects on ovarian cells remains unexplored. OBJECTIVE We investigated if environmentally relevant exposures to organotins [TBT, TPT, or dibutyltin (DBT)] induce lipid dysregulation in ovarian theca cells and the role of the liver X receptor (LXR) in this effect. We also tested the effect of TBT on oocyte maturation and neutral lipid accumulation, and lipid-related transcript expression in cumulus cells and preimplantation embryos. METHODS Primary theca cell cultures derived from human and ovine ovaries were exposed to TBT, TPT, or DBT (1, 10, or 50 ng / ml ). The effect of these chemical exposures on neutral lipid accumulation, lipid abundance and composition, lipid homeostasis-related gene expression, and cytokine secretion was evaluated using liquid chromatography-mass spectrometry (LC-MS), inhibitor-based methods, cytokine secretion, and lipid ontology analyses. We also exposed murine cumulus-oocyte complexes to TBT and evaluated oocyte maturation, embryo development, and lipid homeostasis-related mRNA expression in cumulus cells and blastocysts. RESULTS Exposure to TBT resulted in higher intracellular neutral lipids in human and ovine primary theca cells. In ovine theca cells, this effect was dose-dependent, independent of cell stage, and partially mediated by LXR. DBT and TPT resulted in higher intracellular neutral lipids but to a lesser extent in comparison with TBT. More than 140 lipids and 9 cytokines were dysregulated in TBT-exposed human theca cells. Expression of genes involved in lipogenesis and fatty acid synthesis were higher in theca cells, as well as in cumulus cells and blastocysts exposed to TBT. However, TBT did not impact the rates of oocyte maturation or blastocyst development. DISCUSSION TBT induced dyslipidemia in primary human and ovine theca cells, which may be responsible for some of the TBT-induced fertility dysregulations reported in rodent models of TBT exposure. https://doi.org/10.1289/EHP13955.
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Affiliation(s)
- Natalia Pascuali
- Department of Pathology, University of Illinois Chicago, Chicago, Illinois, USA
| | - Yong Pu
- Department of Pathology, University of Illinois Chicago, Chicago, Illinois, USA
| | - Anita A. Waye
- Department of Pathology, University of Illinois Chicago, Chicago, Illinois, USA
| | - Sarah Pearl
- Department of Obstetrics and Gynecology, Sparrow Health System, Lansing, Michigan, USA
| | - Denny Martin
- Department of Obstetrics and Gynecology, Sparrow Health System, Lansing, Michigan, USA
| | - Allison Sutton
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan, USA
| | - Ariella Shikanov
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan, USA
| | - Almudena Veiga-Lopez
- Department of Pathology, University of Illinois Chicago, Chicago, Illinois, USA
- The Chicago Center for Health and Environment, University of Illinois Chicago, Chicago, Illinois, USA
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Aguilar-Aguilar A, de León-Martínez LD, Forgionny A, Acelas Soto NY, Mendoza SR, Zárate-Guzmán AI. A systematic review on the current situation of emerging pollutants in Mexico: A perspective on policies, regulation, detection, and elimination in water and wastewater. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 905:167426. [PMID: 37774864 DOI: 10.1016/j.scitotenv.2023.167426] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2023] [Revised: 09/22/2023] [Accepted: 09/26/2023] [Indexed: 10/01/2023]
Abstract
Emerging pollutants (EPs) emerged as a group of new compounds whose presence in the environment has been widely detected in Mexico. In this country, different concentrations of pharmaceutical compounds, pesticides, dyes, and microplastics have been reported, which vary depending on the region and the analyzed matrix (i.e., wastewater, surface water, groundwater). The evidence of the EPs' presence focuses on the detection of them, but there is a gap in information regarding is biomonitoring and their effects in health in Mexico. The presence of these pollutants in the country associated with lack of proper regulations in the discharge and disposal of EPs. Therefore, this review aims to provide a comprehensive view of the current environmental status, policies, and frameworks regarding Mexico's situation. The review also highlights the lack of information about biomonitoring since EPs are present in water even after their treatment, leading to a critical situation, which is high exposure to humans and animals. Although, technologies to efficiently eliminate EPs are available, their application has been reported only at a laboratory scale thus far. Here, an overview of health and environmental impacts and a summary of the research works reported in Mexico from 2014 to 2023 were presented. This review concludes with a concrete point of view and perspective on the status of the EPs' research in Mexico as an alert for government entities about the necessity of measures to control the EPs disposal and treatment.
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Affiliation(s)
- Angélica Aguilar-Aguilar
- Centro de Investigación y Estudios de Posgrado, Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, San Luis Potosí 78210, Mexico
| | | | - Angélica Forgionny
- Grupo de Materiales con Impacto, Mat&mpac, Facultad de Ciencias Básicas, Universidad de Medellín, Medellín 55450, Colombia
| | - Nancy Y Acelas Soto
- Grupo de Materiales con Impacto, Mat&mpac, Facultad de Ciencias Básicas, Universidad de Medellín, Medellín 55450, Colombia
| | - Sergio Rosales Mendoza
- Centro de Investigación en Ciencias de la Salud y Biomedicina, Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, Av. Manuel Nava No. 201, San Luis Potosí 78210, Mexico
| | - Ana I Zárate-Guzmán
- Centro de Investigación y Estudios de Posgrado, Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, San Luis Potosí 78210, Mexico.
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Rojas-Hucks S, Rodriguez-Jorquera IA, Nimpstch J, Bahamonde P, Benavides JA, Chiang G, Pulgar J, Galbán-Malagón CJ. South American National Contributions to Knowledge of the Effects of Endocrine Disrupting Chemicals in Wild Animals: Current and Future Directions. TOXICS 2022; 10:toxics10120735. [PMID: 36548568 PMCID: PMC9781241 DOI: 10.3390/toxics10120735] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Revised: 10/28/2022] [Accepted: 11/02/2022] [Indexed: 05/28/2023]
Abstract
Human pressure due to industrial and agricultural development has resulted in a biodiversity crisis. Environmental pollution is one of its drivers, including contamination of wildlife by chemicals emitted into the air, soil, and water. Chemicals released into the environment, even at low concentrations, may pose a negative effect on organisms. These chemicals might modify the synthesis, metabolism, and mode of action of hormones. This can lead to failures in reproduction, growth, and development of organisms potentially impacting their fitness. In this review, we focused on assessing the current knowledge on concentrations and possible effects of endocrine disruptor chemicals (metals, persistent organic pollutants, and others) in studies performed in South America, with findings at reproductive and thyroid levels. Our literature search revealed that most studies have focused on measuring the concentrations of compounds that act as endocrine disruptors in animals at the systemic level. However, few studies have evaluated the effects at a reproductive level, while information at thyroid disorders is scarce. Most studies have been conducted in fish by researchers from Brazil, Argentina, Chile, and Colombia. Comparison of results across studies is difficult due to the lack of standardization of units in the reported data. Future studies should prioritize research on emergent contaminants, evaluate effects on native species and the use of current available methods such as the OMICs. Additionally, there is a primary focus on organisms related to aquatic environments, and those inhabiting terrestrial environments are scarce or nonexistent. Finally, we highlight a lack of funding at a national level in the reviewed topic that may influence the observed low scientific productivity in several countries, which is often negatively associated with their percentage of protected areas.
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Affiliation(s)
- Sylvia Rojas-Hucks
- Departamento de Ecología y Biodiversidad, Facultad Ciencias de la Vida, Universidad Andres Bello, República 440, Santiago 8370134, Chile
| | | | - Jorge Nimpstch
- Facultad de Ciencias, Instituto de Ciencias Marinas y Limnológicas, Universidad Austral de Chile, Valdivia 5090000, Chile
| | - Paulina Bahamonde
- Laboratory of Aquatic Environmental Research, Centro de Estudios Avanzados—HUB Ambiental UPLA, Universidad de Playa Ancha, Valparaíso 2360004, Chile
- Millennium Nucleus of Austral Invasive Salmonids (INVASAL), Concepción 4070386, Chile
- Cape Horn International Center (CHIC), Universidad de Magallanes, Punta Arenas 6210427, Chile
| | - Julio A. Benavides
- Doctorado en Medicina de la Conservación, Facultad Ciencias de la Vida, Universidad Andres Bello, República 440, Santiago 8370134, Chile
- Centro de Investigación para la Sustentabilidad, Facultad Ciencias de la Vida, Universidad Andres Bello, República 440, Santiago 8370134, Chile
- MIVEGEC, IRD, CNRS, Université de Montpellier, 34090 Montpellier, France
| | - Gustavo Chiang
- Departamento de Ecología y Biodiversidad, Facultad Ciencias de la Vida, Universidad Andres Bello, República 440, Santiago 8370134, Chile
- Centro de Investigación para la Sustentabilidad, Facultad Ciencias de la Vida, Universidad Andres Bello, República 440, Santiago 8370134, Chile
| | - José Pulgar
- Departamento de Ecología y Biodiversidad, Facultad Ciencias de la Vida, Universidad Andres Bello, República 440, Santiago 8370134, Chile
| | - Cristóbal J. Galbán-Malagón
- GEMA, Center for Genomics, Ecology & Environment, Universidad Mayor, Camino la Pirámide 5750, Huechuraba, Santiago 8580000, Chile
- Institute of Environment, Florida International University, University Park, Miami, FL 33199, USA
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Gouveia N, Oliveira AJLA, Yokota Harayashiki CA, Souza JC, Longo E, Cano NF, Maltez HF, Lourenço RA, Turpo-Huahuasoncco KV, Castro ÍB. Chemical contamination in coastal areas alters shape, resistance and composition of carnivorous gastropod shells. CHEMOSPHERE 2022; 307:135926. [PMID: 35934096 DOI: 10.1016/j.chemosphere.2022.135926] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2022] [Revised: 07/28/2022] [Accepted: 07/31/2022] [Indexed: 06/15/2023]
Abstract
Morphological, structural and compositional alterations in shells of molluscs have been proposed as putative biomarkers of chemical contamination in coastal zones. Despite this, few studies were carried out using top predator gastropods which tend to be more susceptible to contamination exposure. Thus, the present study assessed disturbances on shells of Stramonita brasiliensis considering compression resistance and organic and mineralogical matrix composition, related to morphometric alterations. Results showed reductions in compression resistance and organic matrix content associated with higher contaminated sites. In addition, a predominance of calcite polymorphs was seen in shells obtained in polluted areas. Such outputs were consistent with local contamination levels which may have induced the observed alterations. Thus, changes in mollusc shells showed good performance as potential biomarkers of coastal contamination, being probably observed in other species of carnivorous gastropods around the world.
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Affiliation(s)
- Nayara Gouveia
- Instituto do Mar, Universidade Federal de São Paulo (IMAR-UNIFESP), Santos, Brazil
| | | | | | - Josiane Carneiro Souza
- Centro de Desenvolvimento de Materiais Funcionais (CDMF), Departamento de Química, Universidade Federal de São Carlos (UFSCar), São Carlos, Brazil
| | - Elson Longo
- Centro de Desenvolvimento de Materiais Funcionais (CDMF), Departamento de Química, Universidade Federal de São Carlos (UFSCar), São Carlos, Brazil
| | - Nilo F Cano
- Instituto do Mar, Universidade Federal de São Paulo (IMAR-UNIFESP), Santos, Brazil
| | - Heloisa França Maltez
- Centro de Ciências Naturais e Humanas (CCNH), Universidade Federal do ABC (UFABC), Santo André, SP, Brazil
| | - Rafael André Lourenço
- Instituto Oceanográfico, Universidade de São Paulo (IO-USP), Cidade Universitária, São Paulo, 05508-120, Brazil
| | - Klinton V Turpo-Huahuasoncco
- Escuela Profesional de Física, Facultad de Ciencias Naturales y Formales, Universidad Nacional de San Agustín de Arequipa (UNSA), Arequipa, Peru
| | - Ítalo Braga Castro
- Instituto do Mar, Universidade Federal de São Paulo (IMAR-UNIFESP), Santos, Brazil.
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Beyer J, Song Y, Tollefsen KE, Berge JA, Tveiten L, Helland A, Øxnevad S, Schøyen M. The ecotoxicology of marine tributyltin (TBT) hotspots: A review. MARINE ENVIRONMENTAL RESEARCH 2022; 179:105689. [PMID: 35777303 DOI: 10.1016/j.marenvres.2022.105689] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 06/17/2022] [Accepted: 06/20/2022] [Indexed: 06/15/2023]
Abstract
Tributyltin (TBT) was widely used as a highly efficient biocide in antifouling paints for ship and boat hulls. Eventually, TBT containing paints became globally banned when TBT was found to cause widespread contamination and non-target adverse effects in sensitive species, with induced pseudohermaphroditism in female neogastropods (imposex) being the best-known example. In this review, we address the history and the status of knowledge regarding TBT pollution and marine TBT hotspots, with a special emphasis on the Norwegian coastline. The review also presents a brief update on knowledge of TBT toxicity in various marine species and humans, highlighting the current understanding of toxicity mechanisms relevant for causing endocrine disruption in marine species. Despite observations of reduced TBT sediment concentrations in many marine sediments over the recent decades, contaminant hotspots are still prevalent worldwide. Consequently, efforts to monitor TBT levels and assessment of potential effects in sentinel species being potentially susceptible to TBT in these locations are still highly warranted.
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Affiliation(s)
- Jonny Beyer
- Norwegian Institute for Water Research (NIVA), Økernveien 94, NO-0579, Oslo, Norway.
| | - You Song
- Norwegian Institute for Water Research (NIVA), Økernveien 94, NO-0579, Oslo, Norway
| | - Knut Erik Tollefsen
- Norwegian Institute for Water Research (NIVA), Økernveien 94, NO-0579, Oslo, Norway
| | - John Arthur Berge
- Norwegian Institute for Water Research (NIVA), Økernveien 94, NO-0579, Oslo, Norway
| | - Lise Tveiten
- Norwegian Institute for Water Research (NIVA), Økernveien 94, NO-0579, Oslo, Norway
| | | | - Sigurd Øxnevad
- Norwegian Institute for Water Research (NIVA), Økernveien 94, NO-0579, Oslo, Norway
| | - Merete Schøyen
- Norwegian Institute for Water Research (NIVA), Økernveien 94, NO-0579, Oslo, Norway
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6
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Gouveia N, Harayashiki CAY, Márquez F, Lourenço RA, Taniguchi S, Castro IB. Mollusc shell shape as pollution biomarkers: Which is the best biological model? MARINE POLLUTION BULLETIN 2022; 179:113663. [PMID: 35462102 DOI: 10.1016/j.marpolbul.2022.113663] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Revised: 04/11/2022] [Accepted: 04/12/2022] [Indexed: 06/14/2023]
Abstract
Alterations in mollusc shells have been proposed contamination biomarkers. We used geometric morphometrics analyses associated with analytical determinations of contaminants to select suitable biological models among species widely distributed on coastal zones. The study was carried out using Lottia subrugosa (herbivore limpet), Crassostrea brasiliana (filter-feeder bivalve), and Stramonita brasiliensis (carnivore gastropod) obtained along a marked contamination gradient at Santos Estuarine System (Brazil). L. subrugosa and S. brasiliensis presented distinct shapes along the gradient, while no significant differences in shell form were seen for C. brasiliana. Indeed, limpets and snails presented morphometric parameters consistent with measured contamination levels hazardous substances. Based on cross-validation models, the reliability of morphometric responses was over 75% for the herbivore and carnivore species. In addition, for S. brasiliensis, a 95.2% confidence was detected in most contaminated sites. Therefore, shell alterations on carnivorous gastropods should be further investigated, seeking to be effectively employed as pollution biomarkers.
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Affiliation(s)
- Nayara Gouveia
- Instituto do Mar, Universidade Federal de São Paulo (IMAR-UNIFESP), Rua Maria Máximo 168, Santos, Brazil
| | | | - Federico Márquez
- LARBIM - IBIOMAR, CCT CONICET-CENPAT, Bvd. Brown 2915, Puerto Madryn, Chubut, Argentina; Universidad Nacional de la Patagonia San Juan Bosco, Bvd. Brown 3051, Puerto Madryn, Chubut, Argentina
| | - Rafael André Lourenço
- Instituto Oceanográfico, Universidade de São Paulo (IO-USP), Praça do Oceanográfico, 191, Cidade Universitária, São Paulo 05508-120, Brazil
| | - Satie Taniguchi
- Instituto Oceanográfico, Universidade de São Paulo (IO-USP), Praça do Oceanográfico, 191, Cidade Universitária, São Paulo 05508-120, Brazil
| | - Italo Braga Castro
- Instituto do Mar, Universidade Federal de São Paulo (IMAR-UNIFESP), Rua Maria Máximo 168, Santos, Brazil.
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Bandara KRV, Chinthaka SDM, Yasawardene SG, Manage PM. Modified, optimized method of determination of Tributyltin (TBT) contamination in coastal water, sediment and biota in Sri Lanka. MARINE POLLUTION BULLETIN 2021; 166:112202. [PMID: 33677333 DOI: 10.1016/j.marpolbul.2021.112202] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Revised: 02/19/2021] [Accepted: 02/22/2021] [Indexed: 06/12/2023]
Abstract
Tributyltin (TBT) is a toxic organotin compound that belongs to the group of Persistent Organic Pollutants (POPs) and it is documented to cause severe sexual disorders development in aquatic fauna. According to the present study, The TBT concentration in coastal water ranged from 303 ± 7.4 ngL-1 to 25 ± 4.2 ngL-1 wherein sediment was from 107 ± 4.1 ngKg-1 to 17 ± 1.4 ngKg-1. TBT in Perna viridis was found to range from 4 ± 1.2 ngKg-1 to 42 ± 2.2 ngKg-1 wet weight and in ascending order of the body weight. The highest TBT level in water and sediment was found in the Colombo port where the highest level of TBT in P. viridis (42 ± 2.2 ngKg-1) was recorded from the Dikkowita fishery harbor. A positive correlation between the number of male P. viridis and TBT level (p < 0.05) suggests possible reproductive impairment in aquatic animals exposed continuously to a high concentration of TBT.
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Affiliation(s)
- K R V Bandara
- Centre for Water Quality and Algae Research, Department of Zoology, Faculty of Applied Sciences, University of Sri Jayewardenepura, Gangodawila, Nugegoda 10250, Sri Lanka; Faculty of Graduate Studies, University of Sri Jayewardenepura, Gangodawila, Nugegoda 10250, Sri Lanka
| | - S D M Chinthaka
- Department of Chemistry, Faculty of Applied Sciences, University of Sri Jayewardenepura, Gangodawila, Nugegoda 10250, Sri Lanka
| | - S G Yasawardene
- Department of Anatomy, Faculty of Medical Sciences, University of Sri Jayewardenepura, Gangodawila, Nugegoda 10250, Sri Lanka
| | - Pathmalal M Manage
- Centre for Water Quality and Algae Research, Department of Zoology, Faculty of Applied Sciences, University of Sri Jayewardenepura, Gangodawila, Nugegoda 10250, Sri Lanka; Faculty of Graduate Studies, University of Sri Jayewardenepura, Gangodawila, Nugegoda 10250, Sri Lanka.
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Reichert G, Hilgert S, Fuchs S, Azevedo JCR. Emerging contaminants and antibiotic resistance in the different environmental matrices of Latin America. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2019; 255:113140. [PMID: 31541833 DOI: 10.1016/j.envpol.2019.113140] [Citation(s) in RCA: 56] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Revised: 08/14/2019] [Accepted: 08/29/2019] [Indexed: 05/24/2023]
Abstract
This review aims to gather and summarize information about the occurrence of emerging contaminants and antibiotic resistance genes in environmental matrices in Latin America. We aim to contribute to future research by compiling a list of priority pollutants adjusted to the needs and characteristics of Latin America, according to the data presented in this study. In order to perform a comprehensive research and secure a representative and unbiased amount of quality data concerning emerging contaminants in Latin America, the research was performed within the Scopus® database in a time frame from 2000 to July 2019. The countries with higher numbers of published articles were Brazil and México, while most studies were performed in the surroundings of Mexico City and in Southern and Southeastern Brazil. The main investigated environmental matrices were drinking water and surface water. The presence of antibiotic resistance was frequently reported, mainly in Brazil. Monitoring efforts should be performed in other countries in Latin America, as well as in other regions of Brazil and México. The suggested priority list for monitoring of emerging contaminants in Latin America covers: di(2-ethylhexyl) phthalate (DEHP), bisphenol-A (BP-A), 4-nonylphenol (4-NP), triclosan (TCS), estrone (E1), estradiol (E2), ethinylestradiol (EE2), tetracycline (TC), amoxicillin (AMOX), norfloxacin (NOR), ampicillin (AMP) and imipenem (IMP). We hope this list serves as a basis for the orientation of the future research and monitoring projects to better understand the distribution and concentration of the listed emerging substances.
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Affiliation(s)
- Gabriela Reichert
- Department of Hydraulics and Sanitation, Federal University of Parana, Av. Coronel Francisco Heráclito dos Santos, 210, 81531-980, Curitiba PR, Brazil; Capes Foundation, Ministry of Education of Brazil, Brasilia, 70040-020, DF, Brazil.
| | - Stephan Hilgert
- Institute for Water and River Basin Management, Department of Aquatic Environmental Engineering, Karlsruhe Institute of Technology, Gotthard-Franz-Str. 3, Building 50.31, 3rd Floor, 76131 Karlsruhe, Germany
| | - Stephan Fuchs
- Institute for Water and River Basin Management, Department of Aquatic Environmental Engineering, Karlsruhe Institute of Technology, Gotthard-Franz-Str. 3, Building 50.31, 3rd Floor, 76131 Karlsruhe, Germany
| | - Júlio César Rodrigues Azevedo
- Department of Hydraulics and Sanitation, Federal University of Parana, Av. Coronel Francisco Heráclito dos Santos, 210, 81531-980, Curitiba PR, Brazil; Capes Foundation, Ministry of Education of Brazil, Brasilia, 70040-020, DF, Brazil; Department of Chemistry and Biology, Federal Technology University of Paraná, Rua Deputado Heitor Alencar Furtado, 5000, 81280-340, Curitiba PR, Brazil
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Fernandez MA. Populations Collapses in Marine Invertebrates Due to Endocrine Disruption: A Cause for Concern? Front Endocrinol (Lausanne) 2019; 10:721. [PMID: 31736872 PMCID: PMC6828821 DOI: 10.3389/fendo.2019.00721] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/30/2018] [Accepted: 10/07/2019] [Indexed: 01/17/2023] Open
Abstract
In the beginning of the twenty first century, the International Program on Chemical Safety published a document entitled Global Assessment of the State-Of-The-Science of Endocrine Disruptors. The work indicated only weak evidence of endocrine-related effects in human populations, and in wild animal populations. This document was revised in 2012 (State of the Science of Endocrine Disrupting Chemicals-2012) (1). The new document and the extensive scientific evidence it provided showed clearly that ED effects could be a risk to human and wildlife health. These works, however, were focused in human health and related animal models, mainly vertebrates and particularly mammals. It can be argued that invertebrates and many other taxa are important parts of all ecosystems, and, in many instances, have been shown to be also vulnerable to endocrine disruption. Thus, this work is aimed to show some observations on important marine invertebrate taxa, from an ecological point of view. The most important example of endocrine disruption in marine wild populations is the imposex response of marine gastropods, known for more than 40 years, and worldwide used to evaluate marine antifouling pollution. Among the mollusks, other important natural resources are bivalve species, used as human food sources and cephalopods, free-living, highly specialized mollusks, and also human food sources. Effects derived from endocrine disruptors in these species indicate that consumption could bring these compounds to human populations in an almost direct way, sometimes without any form of cooking or preparation. While discussing these questions, this work is also aimed to stimulate research on endocrine disruption among the invertebrate taxa that inhabited our oceans, and on which these effects are poorly known today.
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Affiliation(s)
- Marcos Antonio Fernandez
- Marine Ecotoxicology Laboratory, Chemical Oceanography Department, Faculty of Oceanography, Rio de Janeiro State University, Rio de Janeiro, Brazil
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Andrade MN, Santos-Silva AP, Rodrigues-Pereira P, Paiva-Melo FD, de Lima Junior NC, Teixeira MP, Soares P, Dias GRM, Graceli JB, de Carvalho DP, Ferreira ACF, Miranda-Alves L. The environmental contaminant tributyltin leads to abnormalities in different levels of the hypothalamus-pituitary-thyroid axis in female rats. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2018; 241:636-645. [PMID: 29902746 DOI: 10.1016/j.envpol.2018.06.006] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2017] [Revised: 06/01/2018] [Accepted: 06/02/2018] [Indexed: 06/08/2023]
Abstract
Tributyltin is a biocide used in nautical paints, aiming to reduce fouling of barnacles in ships. Despite the fact that many effects of TBT on marine species are known, studies in mammals have been limited, especially those evaluating its effect on the function of the hypothalamus-pituitary-thyroid (HPT) axis. The aim of this study was to investigate the effects of subchronic exposure to TBT on the HPT axis in female rats. Female Wistar rats received vehicle, TBT 200 ng kg-1 BW d-1 or 1000 ng kg-1 BW d-1 orally by gavage for 40 d. Hypothalamus, pituitary, thyroid, liver and blood samples were collected. TBT200 and TBT1000 thyroids showed vacuolated follicular cells, with follicular hypertrophy and hyperplasia. An increase in epithelial height and a decrease in the thyroid follicle and colloid area were observed in TBT1000 rats. Moreover, an increase in the epithelium/colloid area ratio was observed in both TBT groups. Lower TRH mRNA expression was observed in the hypothalami of TBT200 and TBT1000 rats. An increase in Dio1 mRNA levels was observed in the hypothalamus and thyroid in TBT1000 rats only. TSH serum levels were increased in TBT200 rats. In TBT1000 rats, there was a decrease in total T4 serum levels compared to control rats, whereas T3 serum levels did not show significant alterations. We conclude that TBT exposure can promote critical abnormalities in the HPT axis, including changes in TRH mRNA expression and serum TSH and T4 levels, in addition to affecting thyroid morphology. These findings demonstrate that TBT disrupts the HPT axis. Additionally, the changes found in thyroid hormones suggest that TBT may interfere with the peripheral metabolism of these hormones, an idea corroborated by the observed changes in Dio1 mRNA levels. Therefore, TBT exposition might interfere not only with the thyroid axis but also with thyroid hormone metabolism.
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Affiliation(s)
- Marcelle Novaes Andrade
- Grupo de Pesquisa, Desenvolvimento e Inovação em Endocrinologia Experimental-GPDIEEx, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Brazil; Programa de Pós-graduação em Endocrinologia, Faculdade de Medicina, Universidade Federal do Rio de Janeiro, Brazil; Programa de Pós-graduação em Farmacologia e Química Medicinal, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Brazil
| | - Ana Paula Santos-Silva
- Grupo de Pesquisa, Desenvolvimento e Inovação em Endocrinologia Experimental-GPDIEEx, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Brazil; Programa de Pós-graduação em Endocrinologia, Faculdade de Medicina, Universidade Federal do Rio de Janeiro, Brazil; Laboratório de Fisiologia Endócrina Doris Rosenthal, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Brazil
| | - Paula Rodrigues-Pereira
- Grupo de Pesquisa, Desenvolvimento e Inovação em Endocrinologia Experimental-GPDIEEx, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Brazil; Programa de Pós-graduação em Endocrinologia, Faculdade de Medicina, Universidade Federal do Rio de Janeiro, Brazil
| | - Francisca Diana Paiva-Melo
- Grupo de Pesquisa, Desenvolvimento e Inovação em Endocrinologia Experimental-GPDIEEx, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Brazil; Programa de Pós-graduação em Endocrinologia, Faculdade de Medicina, Universidade Federal do Rio de Janeiro, Brazil
| | - Niedson Correa de Lima Junior
- Grupo de Pesquisa, Desenvolvimento e Inovação em Endocrinologia Experimental-GPDIEEx, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Brazil; Programa de Pós-graduação em Endocrinologia, Faculdade de Medicina, Universidade Federal do Rio de Janeiro, Brazil; Laboratório de Fisiologia Endócrina Doris Rosenthal, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Brazil
| | - Mariana Pires Teixeira
- Grupo de Pesquisa, Desenvolvimento e Inovação em Endocrinologia Experimental-GPDIEEx, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Brazil; Programa de Pós-graduação em Endocrinologia, Faculdade de Medicina, Universidade Federal do Rio de Janeiro, Brazil; Laboratório de Fisiologia Endócrina Doris Rosenthal, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Brazil; Programa de Pós-graduação em Patologia, Universidade Federal Fluminense, Brazil
| | - Paula Soares
- Institute for Research and Innovation in Health, University of Porto, Portugal; Institute of Molecular Pathology and Immunology of the University of Porto (IPATIMUP) - Cancer Biology, Porto, Portugal; Medical Faculty, University of Porto, Porto, Portugal; Department of Pathology, Medical Faculty of Porto University, Porto, Portugal
| | - Glaecir Roseni Munstock Dias
- Grupo de Pesquisa, Desenvolvimento e Inovação em Endocrinologia Experimental-GPDIEEx, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Brazil; Programa de Pós-graduação em Endocrinologia, Faculdade de Medicina, Universidade Federal do Rio de Janeiro, Brazil; Laboratório de Fisiologia Endócrina Doris Rosenthal, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Brazil
| | - Jones Bernardes Graceli
- Grupo de Pesquisa, Desenvolvimento e Inovação em Endocrinologia Experimental-GPDIEEx, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Brazil; Laboratório de Endocrinologia e Toxicologia Celular, Departamento de Morfologia, Universidade Federal do Espírito Santo, Brazil
| | - Denise Pires de Carvalho
- Grupo de Pesquisa, Desenvolvimento e Inovação em Endocrinologia Experimental-GPDIEEx, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Brazil; Programa de Pós-graduação em Endocrinologia, Faculdade de Medicina, Universidade Federal do Rio de Janeiro, Brazil; Laboratório de Fisiologia Endócrina Doris Rosenthal, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Brazil
| | - Andrea Claudia Freitas Ferreira
- Grupo de Pesquisa, Desenvolvimento e Inovação em Endocrinologia Experimental-GPDIEEx, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Brazil; Programa de Pós-graduação em Endocrinologia, Faculdade de Medicina, Universidade Federal do Rio de Janeiro, Brazil; Programa de Pós-graduação em Farmacologia e Química Medicinal, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Brazil; Polo de Xerém/NUMPEX, Universidade Federal do Rio de Janeiro, Brazil
| | - Leandro Miranda-Alves
- Grupo de Pesquisa, Desenvolvimento e Inovação em Endocrinologia Experimental-GPDIEEx, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Brazil; Programa de Pós-graduação em Endocrinologia, Faculdade de Medicina, Universidade Federal do Rio de Janeiro, Brazil; Programa de Pós-graduação em Farmacologia e Química Medicinal, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Brazil.
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11
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Rossato M, Costa MB, de Castro ÍB, Pinho GLL. Size, season and origin of gastropods matter in imposex assessments. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2018; 159:324-331. [PMID: 29775828 DOI: 10.1016/j.ecoenv.2018.05.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Revised: 05/03/2018] [Accepted: 05/05/2018] [Indexed: 06/08/2023]
Abstract
Through controlled exposure to tributyltin (TBT), the effects of season, size, and population origin were evaluated on imposex incidence in Stramonita brasiliensis. Four experiments were carried out with organisms collected from three different sites on the Brazilian coast (Torres - Rio Grande do Sul, Farol de Santa Marta - Santa Catarina, and Aracruz - Espírito Santo). S. brasiliensis were anesthetized, sexed, measured, classified by size in small (< 30 mm), medium (≥ 30 to ≤ 40 mm), or big (> 40 mm) and injected in the foot muscle with 0.5 μg g-1 of TBT. Organisms were maintained during one month in aquariums with clear marine water under controlled laboratory conditions. One month after injection, the imposex assessments showed that the population from the southeast (tropical) region was more sensitive to TBT than the population from the south of Brazil (the temperate region). A greater sensitivity in the small and medium categories was observed. Females were also more susceptible to TBT when exposed during their reproductive period. Thus, the present study highlighted the need to ensure that intrinsic biological factors related to organisms are considered in such biomonitoring studies to avoid misinterpretation of results.
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Affiliation(s)
- Martina Rossato
- Instituto de Oceanografia, Laboratório de Microcontaminantes Orgânicos e Ecotoxicologia Aquática, Universidade Federal do Rio Grande, Campus Carreiros C.P. 474, Rio Grande, RS 96203-900, Brazil.
| | - Mércia Barcelos Costa
- Departamento de Ciências Biológicas. Laboratório de Malacologia, Universidade Federal do Espírito Santo, Vitoria, ES 29040-090, Brazil.
| | - Ítalo Braga de Castro
- Departamento de Ciências do Mar, Universidade Federal de São Paulo, Santos, SP 11030-400, Brazil.
| | - Grasiela Lopes Leães Pinho
- Instituto de Oceanografia, Laboratório de Microcontaminantes Orgânicos e Ecotoxicologia Aquática, Universidade Federal do Rio Grande, Campus Carreiros C.P. 474, Rio Grande, RS 96203-900, Brazil.
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12
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Quintas PY, Arias AH, Oliva AL, Domini CE, Alvarez MB, Garrido M, Marcovecchio JE. Organotin compounds in Brachidontes rodriguezii mussels from the Bahía Blanca Estuary, Argentina. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2017; 145:518-527. [PMID: 28783602 DOI: 10.1016/j.ecoenv.2017.07.052] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Revised: 07/21/2017] [Accepted: 07/22/2017] [Indexed: 06/07/2023]
Abstract
Levels of tributyltin and its breakdown compounds, including the first record of monobutyltin (MBT) in history for Latin America, were determined in native mussels (Brachidontes rodriguezii) by means of CG-MS, after extraction/derivatization assisted by ultrasound. The samples were collected in 2013 in Bahía Blanca Estuary (Argentina) at 6 sites, which reflect different levels of maritime activities. Total butyltins (TBts = TBT+ DBT+ MBT) levels ranged from 19.64 to 180.57ng Sn g-1 dry weight. According to the Oslo-Paris commission, the results indicated that 73.9% of mussels could be under biological effects risks associated with TBT pollution. In accordance with the calculated bioaccumulation factors, approximately 56% of samples appeared to have accumulated TBT through the sediments. All sampling sites were shown to be impacted by organotin compounds (OTCs) showing variable levels through seasons, which could be related with the variation of the water temperature. Degradation index analyses suggested aged inputs of TBT possibly under a general degradation process at the area of study. In addition, the occurrence of DBT and MBT could not be uniquely attributed to the degradation pathway of the TBT; in fact, results outlined the possible contribution of some punctual and diffuse sources at the area such as proximity to plastic industries, industrial effluents, sewage outlets and domestic wastewaters.
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Affiliation(s)
- Pamela Y Quintas
- Instituto Argentino de Oceanografía (IADO), Universidad Nacional del Sur (UNS)-CONICET, Bahía Blanca, Argentina.
| | - Andrés H Arias
- Instituto Argentino de Oceanografía (IADO), Universidad Nacional del Sur (UNS)-CONICET, Bahía Blanca, Argentina
| | - Ana L Oliva
- Instituto Argentino de Oceanografía (IADO), Universidad Nacional del Sur (UNS)-CONICET, Bahía Blanca, Argentina
| | - Claudia E Domini
- INQUISUR, Departamento de Química, Universidad Nacional del Sur (UNS)-CONICET, Bahía Blanca, Argentina
| | - Mónica B Alvarez
- INQUISUR, Departamento de Química, Universidad Nacional del Sur (UNS)-CONICET, Bahía Blanca, Argentina
| | - Mariano Garrido
- INQUISUR, Departamento de Química, Universidad Nacional del Sur (UNS)-CONICET, Bahía Blanca, Argentina.
| | - Jorge E Marcovecchio
- Instituto Argentino de Oceanografía (IADO), Universidad Nacional del Sur (UNS)-CONICET, Bahía Blanca, Argentina; Universidad Tecnológica Nacional (UTN)-FRBB, Bahía Blanca, Argentina; Universidad de la Fraternidad de Agrupaciones Santo Tomás de Aquino (FASTA), Mar del Plata, Argentina
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13
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Schwarz TI, Katsiadaki I, Maskrey BH, Scott AP. Rapid uptake, biotransformation, esterification and lack of depuration of testosterone and its metabolites by the common mussel, Mytilus spp. J Steroid Biochem Mol Biol 2017; 171:54-65. [PMID: 28245981 DOI: 10.1016/j.jsbmb.2017.02.016] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/06/2017] [Revised: 02/11/2017] [Accepted: 02/23/2017] [Indexed: 01/02/2023]
Abstract
The presence of the vertebrate steroids, testosterone (T) and 17β-estradiol in mollusks is often cited as evidence that they are involved in the control of their reproduction. In this paper, we show that a likely source of T in at least one species, the common mussel (Mytilus spp.), is from uptake from water. When mussels were exposed to waterborne tritiated T ([3H]-T) in a closed container, the radioactivity decreased rapidly and exponentially until, by 24h, approximately 35% remained in the water. The rate of uptake of radiolabel could not be saturated by concentrations as high as 16.5μgL-1 (mean measured) of non-radiolabeled T, showing that the animals have a very high capacity for uptake of T. At least 30% of the applied radioactivity could be extracted from the tissues of the animals with organic solvents and most of this (26% of the total applied radioactivity) was in the fatty acid ester fraction. Following alkaline hydrolysis, reverse phase HPLC and TLC, this fraction was shown to consist predominantly of 5α-dihydrotestosterone and 5α-androstane-3β,17β-diol, while T was a minor component. These steroids were definitively identified in the fatty acid ester fraction by mass spectrometry. Overall, less than 5% of the [3H]-T applied to the system remained untransformed at the end of exposure. After ten days of depuration there was no reduction in the total amount of radioactivity in the tissues, nor any changes in the ratio of the metabolites in the ester fraction. These findings show that any association between T presence and reproductive status or sex is confounded by their significant capacity for uptake, and that T undergoes extensive metabolism in mussels in vivo and therefore may not be representative of the androgenic burden of the animals. Consequently, measurements of T in mussel tissue offer little utility as an indicator of reproductive status or sex.
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Affiliation(s)
- Tamar I Schwarz
- Centre for Environment, Fisheries and Aquaculture Science, Barrack Road, Weymouth, Dorset DT4 8UB, UK
| | - Ioanna Katsiadaki
- Centre for Environment, Fisheries and Aquaculture Science, Barrack Road, Weymouth, Dorset DT4 8UB, UK.
| | - Benjamin H Maskrey
- Centre for Environment, Fisheries and Aquaculture Science, Barrack Road, Weymouth, Dorset DT4 8UB, UK
| | - Alexander P Scott
- Centre for Environment, Fisheries and Aquaculture Science, Barrack Road, Weymouth, Dorset DT4 8UB, UK
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14
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Begliomini FN, Maciel DC, de Almeida SM, Abessa DM, Maranho LA, Pereira CS, Yogui GT, Zanardi-Lamardo E, Castro ÍB. Shell alterations in limpets as putative biomarkers for multi-impacted coastal areas. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2017; 226:494-503. [PMID: 28442267 DOI: 10.1016/j.envpol.2017.04.045] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Revised: 04/17/2017] [Accepted: 04/19/2017] [Indexed: 06/07/2023]
Abstract
During the last years, shell alterations in gastropods have been proposed as tools to be used in monitoring programs. However, no studies were so far performed investigating the relationships among shell parameters and classical biomarkers of damage. The relationship between shell alterations (biometrics, shape and elemental composition) and biomarkers (LPO and DNA strand break) was evaluated in the limpet L. subrugosa sampled along a contamination gradient in a multi-impacted coastal zone from southeastern Brazil. Statistically significant differences were detected among sites under different pollution levels. The occurrence of shell malformations was consistent with environmental levels of several hazardous substances reported for the studied area and related to lipid peroxidation and DNA damage. In addition, considering the low mobility, wide geographic distribution, ease of collection and abundance of limpets in coastal zones, this putative tool may be a cost-effective alternative to traditional biomarkers. Thus, shell alterations in limpets seem to be good proxies for assessing biological adverse effects in multi-impacted coastal zones.
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Affiliation(s)
- Felipe Nincao Begliomini
- Departamento de Ciências do Mar, Universidade Federal de São Paulo (UNIFESP), Santos, SP, Brazil
| | | | - Sérgio Mendonça de Almeida
- Museu de Zoologia, Universidade de São Paulo (USP), São Paulo, SP, Brazil; Departamento de Biologia, Universidade Católica de Pernambuco, Recife, PE, Brazil
| | - Denis Moledo Abessa
- Instituto de Biociências, Universidade Estadual Paulista (UNESP), São Vicente, SP, Brazil
| | - Luciane Alves Maranho
- Departamento de Ciências do Mar, Universidade Federal de São Paulo (UNIFESP), Santos, SP, Brazil
| | - Camilo Seabra Pereira
- Departamento de Ciências do Mar, Universidade Federal de São Paulo (UNIFESP), Santos, SP, Brazil
| | - Gilvan Takeshi Yogui
- Departamento de Oceanografia, Universidade Federal de Pernambuco (UFPE), Recife, PE, Brazil
| | - Eliete Zanardi-Lamardo
- Departamento de Oceanografia, Universidade Federal de Pernambuco (UFPE), Recife, PE, Brazil
| | - Ítalo Braga Castro
- Departamento de Ciências do Mar, Universidade Federal de São Paulo (UNIFESP), Santos, SP, Brazil.
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15
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Li S, Li M, Gui W, Wang Q, Zhu G. Disrupting effects of azocyclotin to the hypothalamo-pituitary-gonadal axis and reproduction of Xenopus laevis. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2017; 185:121-128. [PMID: 28213302 DOI: 10.1016/j.aquatox.2017.02.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2016] [Revised: 02/06/2017] [Accepted: 02/07/2017] [Indexed: 06/06/2023]
Abstract
Over the past few decades, the hazards associated with the extensive use of organictin compounds have become an issue of extreme concern, while at present the effects of these substances on amphibians remain poorly understood. In the present study, we chose azocyclotin, one of common use acaricides in China. We focused on sexual development and steroidogenesis disrupting effects of azocyclotin in the Xenopus laevis. Tadpoles were exposed to azocyclotin (0.05 and 0.5μg/L) for long-term (4 months) study. Results showed that exposure to azocyclotin caused developmental toxicity, including decreased survival, body weight, body length, gonadosomatic index, hepatosomatic index and female phenotype. At the same time, statistical increase in mean age at completion of metamorphosis was observed in azocyclotin treatments in comparison with control group. Furthermore, hormone concentrations, and steroidogenesis genes expression of adult frog were further evaluated in 28 days exposure. Results demonstrated that the key regulating hormones, e.g. testosterone and pregnenolone, were significantly upregulated. The expression levels of selected steroidogenic genes were also significantly altered. Our study demonstrated that azocyclotin could delay the metamorphosis and disrupt the gonadal differentiation of X. laevis. Steroidogenesis and the expression of genes involved in the hypothalamus-pituitary-gonadal-liver axis in frogs were disrupted after azocyclotin exposure. Azocyclotin showed both androgenic and antiestrogenic activity for X. laevis. Those findings emphasized the influence of azocyclotin on non-target species in the context of ecotoxicological risk assessment.
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Affiliation(s)
- Shuying Li
- Institute of Pesticide and Environmental Toxicology, Zhejiang University, Hangzhou, 310058, PR China
| | - Meng Li
- Institute of Pesticide and Environmental Toxicology, Zhejiang University, Hangzhou, 310058, PR China
| | - Wenjun Gui
- Institute of Pesticide and Environmental Toxicology, Zhejiang University, Hangzhou, 310058, PR China
| | - Qiangwei Wang
- Institute of Pesticide and Environmental Toxicology, Zhejiang University, Hangzhou, 310058, PR China.
| | - Guonian Zhu
- Institute of Pesticide and Environmental Toxicology, Zhejiang University, Hangzhou, 310058, PR China
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