1
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Rodríguez EM. Endocrine disruption in crustaceans: New findings and perspectives. Mol Cell Endocrinol 2024; 585:112189. [PMID: 38365065 DOI: 10.1016/j.mce.2024.112189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 02/02/2024] [Accepted: 02/12/2024] [Indexed: 02/18/2024]
Abstract
A significant advance has been made, especially during the last two decades, in the knowledge of the effects on crustacean species of pollutants proven to be endocrine disruptors in vertebrates. Such effects have been also interpreted in the light of recent studies on crustacean endocrinology. Year after year, the increased number of reports refer to the effects of endocrine disruptors on several processes hormonally controlled. This review is aimed at summarizing and discussing the effects of several kinds of endocrine disruptors on the hormonal control of reproduction (including gonadal growth, sexual differentiation, and offspring development), molting, and intermediate metabolism of crustaceans. A final discussion about the state of the art, as well as the perspective of this toxicological research line is given.
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Affiliation(s)
- Enrique M Rodríguez
- Universidad de Buenos Aires. CONICET. Instituto de Biodiversidad y Biología Experimental y Aplicada (IBBEA). Facultad de Ciencias Exactas y Naturales, Departamento de Biodiversidad y Biología Experimental. Ciudad Universitaria, C1428EGA, Buenos Aires, Argentina.
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2
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Peng Z, Man Q, Meng L, Wang S, Cai H, Zhang C, Li X, Wang H, Zhu G. A PITX2-HTR1B pathway regulates the asymmetric development of female gonads in chickens. PNAS NEXUS 2023; 2:pgad202. [PMID: 37388922 PMCID: PMC10304771 DOI: 10.1093/pnasnexus/pgad202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Revised: 02/07/2023] [Accepted: 06/08/2023] [Indexed: 07/01/2023]
Abstract
All female vertebrates develop a pair of ovaries except for birds, in which only the left gonad develops into an ovary, whereas the right gonad regresses. Previous studies found that the transcription factor Paired-Like Homeodomain 2 (PITX2), a key mediator for left/right morphogenesis in vertebrates, was also implicated in asymmetric gonadal development in chickens. In this study, we systematically screened and validated the signaling pathways that could be targeted by Pitx2 to control unilateral gonad development. Integrated chromatin immunoprecipitation sequencing (ChIP-seq) and RNA sequencing (RNA-seq) analyses indicated that Pitx2 directly binds to the promoters of genes encoding neurotransmitter receptors and leads to left-biased expression of both serotonin and dopamine receptors. Forcibly activating serotonin receptor 5-Hydroxytryptamine Receptor 1B (HTR1B) signaling could induce ovarian gene expression and cell proliferation to partially rescue the degeneration of the right gonad. In contrast, inhibiting serotonin signaling could block the development of the left gonad. These findings reveal a PITX2-HTR1B genetic pathway that guides the left-specific ovarian growth in chickens. We also provided new evidence showing neurotransmitters stimulate the growth of nonneuronal cells during the early development of reproductive organs well before innervation.
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Affiliation(s)
| | | | | | - Sheng Wang
- College of Animal Science and Technology, Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Agricultural University, Taian 271018, China
| | - Hao Cai
- College of Animal Science and Technology, Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Agricultural University, Taian 271018, China
| | - Chuansheng Zhang
- College of Animal Science and Technology, Hebei Normal University of Science and Technology, Qinhuangdao 066600, China
| | - Xianyao Li
- College of Animal Science and Technology, Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Agricultural University, Taian 271018, China
| | - Heng Wang
- To whom correspondence should be addressed: (G.Z.); (H.W.)
| | - Guiyu Zhu
- To whom correspondence should be addressed: (G.Z.); (H.W.)
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3
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Zhu J, Li J, Chapman EC, Shi H, Ciocan CM, Chen K, Shi X, Zhou J, Sun P, Zheng Y, Rotchell JM. Gonadal Atresia, Estrogen-Responsive, and Apoptosis-Specific mRNA Expression in Marine Mussels from the East China Coast: A Preliminary Study. BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2022; 108:1111-1117. [PMID: 35075493 PMCID: PMC9188513 DOI: 10.1007/s00128-022-03461-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Accepted: 01/11/2022] [Indexed: 06/14/2023]
Abstract
This preliminary survey analysed mussel atresia incidences, estrogen-responsive and apoptotic-specific molecular end points, and aqueous and gonadal levels of selected estrogens from the East China coast. Estrogen levels were low (e.g. < LOD-28.36 ng/L, < LOD-3.88 ng/g wet weight of tissue for BPA) relative to worldwide freshwater environments, but high oocyte follicle atresia incidences (up to 26.6%) occurred at selected sites. Expression of estrogen-responsive ER2 was significantly increased in males relative to females at sites with high atresia incidences in females. A second estrogen-responsive gene, V9, was significantly increased at two sites in April in females relative to males; the opposite was true for the remaining two sites. Apoptosis-specific genes (Bcl-2, fas) showed elevated expression in males relative to females at the site with the highest atresia incidence. These results provide coastal estrogen levels and the utility of several estrogen-specific molecular-level markers for marine mussels.
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Affiliation(s)
- Jingmin Zhu
- State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200062, China
| | - Jiana Li
- State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200062, China
- Department of Biological and Marine Sciences, Hardy Building, University of Hull, Cottingham Road, Hull, HU6 7RX, UK
| | - Emma C Chapman
- Department of Biological and Marine Sciences, Hardy Building, University of Hull, Cottingham Road, Hull, HU6 7RX, UK
| | - Huahong Shi
- State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200062, China
| | - Corina M Ciocan
- School of Pharmacy and Biomolecular Sciences, University of Brighton, Lewes Road, Brighton, BN2 4GJ, UK
| | - Kai Chen
- State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200062, China
| | - Xiaodong Shi
- State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200062, China
| | - JunLiang Zhou
- State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200062, China
| | - Peiying Sun
- State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200062, China
| | - Yueyao Zheng
- State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200062, China
| | - Jeanette M Rotchell
- State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200062, China.
- Department of Biological and Marine Sciences, Hardy Building, University of Hull, Cottingham Road, Hull, HU6 7RX, UK.
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Fontes MK, Dourado PLR, Campos BGD, Maranho LA, Almeida EAD, Abessa DMDS, Pereira CDS. Environmentally realistic concentrations of cocaine in seawater disturbed neuroendrocrine parameters and energy status in the marine mussel Perna perna. Comp Biochem Physiol C Toxicol Pharmacol 2022; 251:109198. [PMID: 34601085 DOI: 10.1016/j.cbpc.2021.109198] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 09/21/2021] [Accepted: 09/26/2021] [Indexed: 11/25/2022]
Abstract
Cocaine (COC) is a powerful illicit drug frequently detected in the aquatic environment. COC acts by inhibiting the reuptake of dopamine (DOPA) and 5-hydroxytryptamine (5-HT - serotonin) and causes endocrine disturbances in mammals. This study investigated similar effects from cocaine exposure in the marine mussel Perna perna, as well as neurotoxicity and energy imbalances. Mussels were exposed to COC (0.2 μg.L-1 and 2 μg.L-1) for periods of 48, 96, and 168 h. Acetylcholinesterase (AChE) was measured in adductor muscle tissue to determine neurotoxicity, and neurotransmitter levels (DOPA and 5-HT), monoamine oxidase (MAO) and cyclooxygenase (COX) activity, and energy status (mitrochondrial electron transport, MET, and total lipids, TLP) were evaluated in the mussels' gonads. COC decreased AChE activity in the mussels exposed to 0.2 μg.L-1 and 2 μg.L -1 after 168 h, and all concentrations of COC increased neurotransmitter levels. Increases in MET (0.2 μg.L -1, for all exposure periods) and TLP (0.2 μg.L 1 after 48 h, and 2 μg.L -1 after 96 h and 168 h) were also observed. No significant change was detected in MAO activity. COC also decreased COX activity in the mussels exposed to 0.2 μg.L -1 (48 h and 96 h) and 2 μg.L -1 (96 h). These results suggest that COC may compromise neurotransmitter levels and COX activity. Furthermore, the changes in MET and LPT suggest that COC affects the energy balance of the mussels, and could negatively affect physiological processes such as metabolism, hormone production, and embryonic development.
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Affiliation(s)
- Mayana Karoline Fontes
- Instituto de Biociências, Campus do Litoral Paulista, Universidade Estadual Paulista Júlio de Mesquita Filho, Infante Dom Henrique s/n, PC 11330-900 São Vicente, Brazil
| | - Priscila Leocadio Rosa Dourado
- Instituto de Biociências, Letras e Ciências Exatas, Universidade Estadual Paulista (UNESP), Campus de São José do Rio Preto R. Cristóvão Colombo, 2265, PC 15054-000, São José do Rio Preto, SP, Brazil
| | - Bruno Galvão de Campos
- Instituto de Biociências, Campus do Litoral Paulista, Universidade Estadual Paulista Júlio de Mesquita Filho, Infante Dom Henrique s/n, PC 11330-900 São Vicente, Brazil
| | - Luciane Alves Maranho
- Instituto de Biociências, Campus do Litoral Paulista, Universidade Estadual Paulista Júlio de Mesquita Filho, Infante Dom Henrique s/n, PC 11330-900 São Vicente, Brazil
| | - Eduardo Alves de Almeida
- Departmento de Ciências Naturais, Fundação Universidade Regional de Blumenau, Av. Antônio da Veiga 140, PC 89030-903 Blumenau, Santa Catarina, Brazil
| | - Denis Moledo de Souza Abessa
- Instituto de Biociências, Campus do Litoral Paulista, Universidade Estadual Paulista Júlio de Mesquita Filho, Infante Dom Henrique s/n, PC 11330-900 São Vicente, Brazil
| | - Camilo Dias Seabra Pereira
- Departamento de Ciências do Mar, Universidade Federal de São Paulo, Rua Maria Máximo, 168, PC 11030-100 Santos, Brazil; Laboratório de Ecotoxicologia, Universidade Santa Cecília, Rua Oswaldo Cruz 266, PC 11045-907 Santos, Brazil.
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Canesi L, Miglioli A, Balbi T, Fabbri E. Physiological Roles of Serotonin in Bivalves: Possible Interference by Environmental Chemicals Resulting in Neuroendocrine Disruption. Front Endocrinol (Lausanne) 2022; 13:792589. [PMID: 35282445 PMCID: PMC8913902 DOI: 10.3389/fendo.2022.792589] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2021] [Accepted: 01/25/2022] [Indexed: 11/15/2022] Open
Abstract
Contaminants of Emerging Concerns (CECs) are defined as chemicals not commonly monitored in aquatic ecosystems, but with the potential to cause adverse effects on biota. CECs include Endocrine Disrupting Chemicals (EDCs) and Neuro-Endocrine disruptors (NEDs) of vertebrates. However, most invertebrates only rely on neuroendocrine systems to maintain homeostatic processes. Although conserved neuroendocrine components have been characterized in ecologically relevant groups, limited knowledge on invertebrate neuroendocrinology makes it difficult to define EDCs and NEDs in most species. The monoamine serotonin (5-hydroxytryptamine, 5-HT) acts both as a neurotransmitter and as a peripheral hormone in mammals. In molluscs, 5-HT is involved in multiple physiological roles and molecular components of the serotonergic system have been identified. This review is focused on the effects of CECs on the serotonergic system of bivalve molluscs. Bivalves are widespread in all aquatic environments, estuarine and coastal areas in particular, where they are exposed to a variety of chemicals. In bivalves, 5-HT is involved in gametogenesis and spawning, oocyte maturation and sperm motility, regulates heart function, gill ciliary beating, mantle/siphon function, the ''catch'' state of smooth muscle and immune responses. Components of 5-HT transduction (receptors and signaling pathways) are being identified in several bivalve species. Different CECs have been shown to affect bivalve serotonergic system. This particularly applies to antidepressants, among the most commonly detected human pharmaceuticals in the aquatic environment. In particular, selective serotonin reuptake inhibitors (SSRIs) are frequently detected in seawater and in bivalve tissues. Information available on the effects and mechanisms of action of SSRIs on the serotonergic system of adult bivalves is summarized. Data are also reported on the effects of CECs on development of neuroendocrine pathways of early larval stages, in particular on the effects of model EDCs in the marine mussel Mytilus galloprovincialis. Overall, available data point at the serotonergic system as a sensitive target for neuroendocrine disruption in bivalves. The results contribute drawing Adverse Outcome Pathways (AOPs) for model EDCs and SSRIs in larvae and adults. However, basic research on neuroendocrine signaling is still needed to evaluate the potential impact of neuroendocrine disruptors in key invertebrate groups of aquatic ecosystems.
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Affiliation(s)
- Laura Canesi
- Environmental Physiology Laboratory, Department of Earth, Environment and Life Sciences, University of Genoa, Genoa, Italy
- *Correspondence: Laura Canesi,
| | - Angelica Miglioli
- Environmental Physiology Laboratory, Department of Earth, Environment and Life Sciences, University of Genoa, Genoa, Italy
- Laboratoire de Biologie du Developpement de Villefranche-sur-mer, Institut de la mer, Sorbonne Université, CNRS, Villefranche-sur-mer, France
| | - Teresa Balbi
- Environmental Physiology Laboratory, Department of Earth, Environment and Life Sciences, University of Genoa, Genoa, Italy
| | - Elena Fabbri
- Department of Biological, Geological, and Environmental Sciences, University of Bologna, Ravenna, Italy
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Xu R, Pan L, Yang Y, Zhou Y. Characterizing transcriptome in female scallop Chlamys farreri provides new insights into the molecular mechanisms of reproductive regulation during ovarian development and spawn. Gene 2020; 758:144967. [PMID: 32707299 DOI: 10.1016/j.gene.2020.144967] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2020] [Revised: 07/06/2020] [Accepted: 07/17/2020] [Indexed: 10/23/2022]
Abstract
Bivalve mollusks are descendants of an early-Cambrian lineage and have successfully evolved unique strategies for reproduction. Nonetheless, the molecular mechanisms underlying reproductive regulation in mollusks remain to be elucidated. In this study, transcriptomes of ovary at four reproductive stages in female Chlamys farreri were characterized by RNA-Seq. Regarding signaling pathways, ECM-receptor interaction pathway, mTOR signaling pathway, Fanconi anemia pathway, FoxO signaling pathway, Wnt signaling pathway and Hedgehog signaling pathway were enriched during ovarian development processes. In addition, pathways related to energy metabolism such as Nitrogen metabolism and Arachidonic acid metabolism were enriched at spawn stage. Interestingly, Neuroactive ligand-receptor interaction was significantly enriched involved in ovarian development and spawn, and indicated the potential functions of nervous system on reproductive regulation in C. farreri. What's more, this study identified and characterized fourteen genes involved in "sex hormones synthesis and regulation", "ovarian development and spawn" and "maternal immunity" during the four reproductive stages in C. farreri. We determined that CYP17 uniquely affected gamete release by influencing the physiological balance among the steroid hormones and showed that receptors of the 5-HT and GABA neurotransmitters were tightly associated with ovarian maturation. Furthermore, to the best of our knowledge, this is the first study to report the maternal effect gene Zar1 in bivalve mollusks, likewise the maternal immunity genes displayed coordinated and cooperative expression during reproductive periods, which strengthened the environmental adaptation mechanisms of bivalves. Taken together, this study provides the first dynamic transcriptomic analysis of C. farreri at four key reproductive stages, which will assist in revealing the molecular mechanisms underlying bivalves on reproductive regulation in ovarian development and spawn.
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Affiliation(s)
- Ruiyi Xu
- The Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao 266003, China
| | - Luqing Pan
- The Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao 266003, China.
| | - Yingying Yang
- The Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao 266003, China
| | - Yueyao Zhou
- The Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao 266003, China
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7
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Identification, characterization, and expression analysis of a serotonin receptor involved in the reproductive process of the Pacific abalone, Haliotis discus hannai. Mol Biol Rep 2019; 47:555-567. [PMID: 31696430 DOI: 10.1007/s11033-019-05162-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Accepted: 10/23/2019] [Indexed: 10/25/2022]
Abstract
Serotonin receptor (5-HT) is a biogenic amine acting as a neurotransmitter and neuromodulator that mediates various aspects of reproduction and gametogenesis. The full-length nucleotide sequence of Haliotis discus hannai encodes a protein of 417 amino acids with a predicted molecular mass of 46.54 kDa and isoelectric point of 8.94. The structural profile of 5-HTHdh displayed key features of G protein-coupled receptors, including seven hydrophobic transmembrane domains, putative N-linked glycosylation sites, and several phosphorylation consensus motifs. It shares the highest homology of its amino acid sequence with the 5-HT receptor from Haliotis asinina, and to lesser extent of human 5-HT receptor. The cloned sequence possesses two cysteine residues (Cys-115 and Cys-193), which are likely to form a disulfide bond. Phylogenetic comparison with other known 5-HT receptor genes revealed that the 5-HTHdh is most closely related to the 5-HTHa receptor. The three-dimensional structure of the 5-HTHdh showed multiple alpha helices which is separated by a helix-loop-helix (HLH) structure. Quantitative PCR demonstrated that the receptor mRNA was predominantly expressed in the pleuropedal ganglion. Significant differences in the transcriptional activity of the 5-HTHdh gene were observed in the ovary at the ripening stage. An exclusive expression was detected in pleuropedal ganglion, testis, and ovary at higher effective accumulative temperature (1000 °C). In situ hybridization showed that the 5-HTHdh expressing neurosecretory cells were distributed in the cortex of the pleuropedal ganglion. Our results suggest that 5-HTHdh synthesized in the neural ganglia may be involved in oocyte maturation and spawning of H. discus hannai.
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Hallmann A, Konieczna L, Swiezak J, Milczarek R, Smolarz K. Aromatisation of steroids in the bivalve Mytilus trossulus. PeerJ 2019; 7:e6953. [PMID: 31198629 PMCID: PMC6535040 DOI: 10.7717/peerj.6953] [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] [Subscribe] [Scholar Register] [Received: 02/16/2019] [Accepted: 04/12/2019] [Indexed: 11/20/2022] Open
Abstract
In this study, we demonstrated the presence of the enzymatic complex able to perform aromatization (estrogen synthesis) in both, the microsomal and mitochondrial fractions of gills and gonads from Mytilus trossulus. Based on in vitro experiments, we highlighted the importance of temperature as the limiting factor of aromatisation efficiency (AE) in mussels. After testing range of temperatures (4–23 °C), the highest AE was found during incubation at 8 °C and pH 7.6 (41.66 pmol/h/mg protein in gills and 58.37 pmol/h/mg protein in gonads). The results were confirmed during field studies where the most efficient aromatisation occurred in bivalves collected in spring while the least effective in those collected in winter. During in vitro studies, AE turned out to be more intensive in female gonads than in male gonads. The process was also more intensive in mitochondrial fraction than in microsomal one (62.97 pmol/h/mg protein in male gills and 73.94 pmol/h/mg protein in female gonads). Enzymatic complex (aromatase-like enzyme) catalysing aromatisation in mussels was found to be insensitive to inhibitory effect of selective inhibitors of mammalian aromatase such as letrozole and anastrazole, suggesting its different structure from vertebrate aromatase. Further in vivo studies using 13C-labeled steroids at 8 °C temperature window confirmed that bivalves are able to uptake testosterone and androstenedione from the ambient environment and metabolise them to estrone and 17β-estradiol thus confirming endogenous estrogen’ synthesis.
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Affiliation(s)
- Anna Hallmann
- Department of Pharmaceutical Biochemistry, Medical University of Gdańsk, Gdańsk, Poland
| | - Lucyna Konieczna
- Department of Pharmaceutical Chemistry, Medical University of Gdańsk, Gdańsk, Poland
| | - Justyna Swiezak
- Department of Marine Ecosystem Functioning, University of Gdańsk, Gdynia, Poland
| | - Ryszard Milczarek
- Department of Pharmaceutical Biochemistry, Medical University of Gdańsk, Gdańsk, Poland
| | - Katarzyna Smolarz
- Department of Marine Ecosystem Functioning, University of Gdańsk, Gdynia, Poland
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Kim KS, Kim MA, Sohn YC. Molecular characterization, expression analysis, and functional properties of multiple 5-hydroxytryptamine receptors in Pacific abalone (Haliotis discus hannai). Gen Comp Endocrinol 2019; 276:52-59. [PMID: 30849410 DOI: 10.1016/j.ygcen.2019.03.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Revised: 02/12/2019] [Accepted: 03/01/2019] [Indexed: 10/27/2022]
Abstract
Neurotransmitters such as serotonin (5-hydroxytryptamine; 5-HT) in the central nervous system regulate diverse physiological functions, including reproduction, feeding, learning, and memory, in diverse animal phyla. 5-HT and the 5-HT1 subtype receptor play important roles in sexual maturation and in the initiation of gamete release in mollusks. However, little is known about the involvement of other 5-HT receptor subfamilies in the reproduction process. In the present study, we identified the cDNAs encoding eight subtypes of 5-HT receptors from the ganglia tissues of the Pacific abalone Haliotis discus hannai (Mollusca; Gastropoda; Haliotidae), and examined the gonadal expression of the transcripts of 5-HT receptors. A phylogenetic analysis indicated that the molluskan 5-HT receptors are largely classified into four major clades: 5-HT1/5/7, 5-HT2, 5-HT4, and 5-HT6. Among the H. discus hannai (Hdh) 5-HT1-7 transcripts, Hdh5-HT1B, 4A, 4B, and 6 were the major subtypes detected in the mature ovary. Estradiol-17β injection into the pedal sinus induced the downregulation of 5-HT4B and upregulation of 5-HT6 transcripts in the ovary of mature abalone within 72 h. In HEK293 cells overexpressing Hdh5-HT1B, forskolin-stimulated cAMP response element luciferase (CRE-Luc) reporter activity was inhibited by 5-HT in a dose-dependent manner, whereas serum response element luciferase (SRE-Luc) activity was not affected. In Hdh5-HT4A-expressing HEK293 cells, forskolin-stimulated CRE-Luc and SRE-Luc reporter activities were both marginally increased by treatment with a high dose of 5-HT. Our results provide new insights into the roles of 5-HT through diverse G protein-coupled 5-HT receptors in the reproductive process of mollusks.
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Affiliation(s)
- Kyeong Seop Kim
- Department of Marine Molecular Biosciences, Gangneung-Wonju National University, 7 Jukheon-gil, Gangneung, Gangwon 25457, Republic of Korea
| | - Mi Ae Kim
- East Coast Life Sciences Institute, Gangneung-Wonju National University, 7 Jukheon-gil, Gangneung, Gangwon 25457, Republic of Korea
| | - Young Chang Sohn
- Department of Marine Molecular Biosciences, Gangneung-Wonju National University, 7 Jukheon-gil, Gangneung, Gangwon 25457, Republic of Korea.
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Rosati L, Agnese M, Abagnale L, Aniello F, Andreuccetti P, Prisco M. The Mussel
Mytilus galloprovincialis
in the Bay of Naples: New Insights on Oogenic Cycle and Its Hormonal Control. Anat Rec (Hoboken) 2019; 302:1039-1049. [DOI: 10.1002/ar.24075] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2017] [Revised: 08/22/2018] [Accepted: 10/12/2018] [Indexed: 01/25/2023]
Affiliation(s)
- Luigi Rosati
- Department of BiologyFederico II Naples University Naples Italy
- Dipartimento di Scienze e TecnologieUniversità degli Studi di Napoli “Parthenope” Naples Italy
| | - Marisa Agnese
- Department of BiologyFederico II Naples University Naples Italy
| | - Ludovico Abagnale
- 3th South Naples ASLVeterinary Operative Unit, Torre del Greco Naples Italy
| | | | | | - Marina Prisco
- Department of BiologyFederico II Naples University Naples Italy
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11
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Tamvacakis AN, Senatore A, Katz PS. Single neuron serotonin receptor subtype gene expression correlates with behaviour within and across three molluscan species. Proc Biol Sci 2018; 285:rspb.2018.0791. [PMID: 30135151 DOI: 10.1098/rspb.2018.0791] [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: 04/09/2018] [Accepted: 07/25/2018] [Indexed: 12/30/2022] Open
Abstract
The marine mollusc, Pleurobranchaea californica varies daily in whether it swims and this correlates with whether serotonin (5-HT) enhances the strength of synapses made by the swim central pattern generator neuron, A1/C2. Another species, Tritonia diomedea, reliably swims and does not vary in serotonergic neuromodulation. A third species, Hermissenda crassicornis, never produces this behaviour and lacks the neuromodulation. We found that expression of particular 5-HT receptor subtype (5-HTR) genes in single neurons correlates with swimming. Orthologues to seven 5-HTR genes were identified from whole-brain transcriptomes. We isolated individual A1/C2 neurons and sequenced their RNA or measured 5-HTR gene expression using absolute quantitative PCR. A1/C2 neurons isolated from Pleurobranchaea that produced a swim motor pattern just prior to isolation expressed 5-HT2a and 5-HT7 receptor genes, as did all Tritonia samples. These subtypes were absent from A1/C2 isolated from Pleurobranchaea that did not swim on that day and from Hermissenda A1/C2 neurons. Expression of other receptors was not correlated with swimming. This suggests that these 5-HTRs may mediate the modulation of A1/C2 synaptic strength and play an important role in swimming. Furthermore, it suggests that regulation of receptor expression could underlie daily changes in behaviour as well as evolution of behaviour.
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Affiliation(s)
- A N Tamvacakis
- Neuroscience Institute, Georgia State University, Atlanta, GA, USA
| | - A Senatore
- Biology Department, University of Toronto, Mississauga, Toronto, Ontario, Canada
| | - P S Katz
- Biology Department, University of Massachusetts at Amherst, Amherst, MA, USA
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12
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Falfushynska HI, Gnatyshyna LL, Ivanina AV, Sokolova IM, Stoliar OB. Detoxification and cellular stress responses of unionid mussels Unio tumidus from two cooling ponds to combined nano-ZnO and temperature stress. CHEMOSPHERE 2018; 193:1127-1142. [PMID: 29874741 DOI: 10.1016/j.chemosphere.2017.11.079] [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: 08/31/2017] [Revised: 10/30/2017] [Accepted: 11/16/2017] [Indexed: 06/08/2023]
Abstract
Bivalve mollusks from the cooling reservoirs of fuel power plants (PP) are acclimated to the chronic heating and chemical pollution. We investigated stress responses of the mussels from these ponds to determine their tolerance to novel environmental pollutant, zinc oxide nanoparticles (nZnO). Male Unio tumidus from the reservoirs of Dobrotvir and Burschtyn PPs (DPP and BPP), Ukraine were exposed for 14 days to nZnO (3.1 μM), Zn2+ (3.1 μM) at 18 °C, elevated temperature (T, 25 °C), or nZnO at 25 °C (nZnO + T). Control groups were held at 18 °C. Zn-containing exposures resulted in the elevated concentrations of total and Zn-bound metallothionein (MT and Zn-MT) in the digestive gland, an increase in the levels of non-metalated MT (up to 5 times) and alkali-labile phosphates and lysosomal membrane destabilization in hemocytes. A common signature of nZnO exposures was modulation of the multixenobiotic-resistance protein activity (a decrease in the digestive gland and increase in the gills). The origin of population strongly affected the cellular stress responses of mussels. DPP-mussels showed depletion of caspase-3 in the digestive gland and up-regulation of HSP70, HSP72 and HSP60 levels in the gill during most exposures, whereas in the BPP-mussels caspase-3 was up-regulated and HSPs either downregulated or maintained stable. BPP-mussels were less adapted to heating shown by a glutathione depletion at elevated temperature (25 °C). Comparison with the earlier studies on mussels from pristine habitats show that an integrative 'eco-exposome'-based approach is useful for the forecast of the biological responses to novel adverse effects on aquatic organisms.
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Affiliation(s)
- Halina I Falfushynska
- Research Laboratory of Comparative Biochemistry and Molecular Biology, Ternopil National Pedagogical University, Ternopil, Ukraine
| | - Lesya L Gnatyshyna
- Research Laboratory of Comparative Biochemistry and Molecular Biology, Ternopil National Pedagogical University, Ternopil, Ukraine; Department of General Chemistry, Ternopil State Medical University, Ternopil, Ukraine
| | - Anna V Ivanina
- Department of Biological Sciences, University of North Carolina at Charlotte, 9201 University City Blvd., Charlotte, NC 28223, USA
| | - Inna M Sokolova
- Department of Marine Biology, Institute of Biological Sciences, University of Rostock, Rostock, Germany.
| | - Oksana B Stoliar
- Research Laboratory of Comparative Biochemistry and Molecular Biology, Ternopil National Pedagogical University, Ternopil, Ukraine.
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Bonnefille B, Gomez E, Alali M, Rosain D, Fenet H, Courant F. Metabolomics assessment of the effects of diclofenac exposure on Mytilus galloprovincialis: Potential effects on osmoregulation and reproduction. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 613-614:611-618. [PMID: 28930695 DOI: 10.1016/j.scitotenv.2017.09.146] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2017] [Revised: 09/14/2017] [Accepted: 09/14/2017] [Indexed: 06/07/2023]
Abstract
The presence of pharmaceutically active compounds in aquatic environments has become a major concern over the past 20years. Elucidation of their mode of action and effects in non-target organisms is thus now a major ecotoxicological challenge. Diclofenac (DCF) is among the pharmaceutical compounds of interest based on its inclusion in the European Union Water Framework Directive Watch List. In this study, our goal was to investigate the potential of a metabolomic approach to acquire information without any a priori hypothesis about diclofenac effects on marine mussels. For this purpose, mussel's profiles were generated by liquid chromatography combined with high resolution mass spectrometry. Two main metabolic pathways were found to be impacted by diclofenac exposure. The tyrosine metabolism was mostly down-modulated and the tryptophan metabolism was mostly up-modulated following exposure. To our knowledge, such DCF effects on mussels have never been described despite being of concern for these organisms: catecholamines and serotonin may be involved in osmoregulation, and in gamete release in mollusks. Our results suggest potential impairment of mussel osmoregulation and reproduction following a DCF exposure.
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Affiliation(s)
- Bénilde Bonnefille
- UMR HydroSciences Montpellier, Université Montpellier, Montpellier, France
| | - Elena Gomez
- UMR HydroSciences Montpellier, Université Montpellier, Montpellier, France
| | - Mellis Alali
- UMR HydroSciences Montpellier, Université Montpellier, Montpellier, France
| | - David Rosain
- UMR HydroSciences Montpellier, Université Montpellier, Montpellier, France
| | - Hélène Fenet
- UMR HydroSciences Montpellier, Université Montpellier, Montpellier, France
| | - Frédérique Courant
- UMR HydroSciences Montpellier, Université Montpellier, Montpellier, France.
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Fraser M, Fortier M, Foucher D, Roumier PH, Brousseau P, Fournier M, Surette C, Vaillancourt C. Exposure to low environmental concentrations of manganese, lead, and cadmium alters the serotonin system of blue mussels. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2018; 37:192-200. [PMID: 28796292 DOI: 10.1002/etc.3942] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2016] [Revised: 03/03/2017] [Accepted: 08/08/2017] [Indexed: 06/07/2023]
Abstract
Serotonin plays a crucial role in mussel survival and reproduction. Although the serotonin system can be affected by metals, the effects of environmental concentrations of metals such as manganese (Mn), lead (Pd), and cadmium (Cd) have never been studied in blue mussels. The present study aimed to determine the effects of exposure to Mn, Pb, or Cd on serotonin levels, monoamine oxidase (MAO) activity, and serotonin transporter (SERT) levels in the blue mussel Mytilus edulis. Mussels were exposed in vivo to increasing and environmentally relevant doses of Mn (10-1000 nM; 0.5-50 μg/L), Pb (0.01-10 nM; 0.002-2 μg/L), or Cd (0.01-10 nM; 0.001-1 μg/L) for 28 d. Serotonin levels, MAO activity, and SERT expression were analyzed in the mussel mantle. Expression of SERT protein was significantly decreased, by up to 81%, following Mn, Pb, or Cd exposure. The activity of MAO in females was almost 2-fold higher, versus males, in nonexposed control mussels. In mussels exposed to 0.1 nM of Pb (0.02 μg/L), MAO activity was increased in males and decreased in females. In Cd-exposed mussels, a sex-dependent, inverted nonmonotonic pattern of MAO activity was observed. These results clearly indicate that low environmental concentrations of Mn, Pb, and Cd affect the serotonin system in blue mussels. Environ Toxicol Chem 2018;37:192-200. © 2017 SETAC.
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Affiliation(s)
- Marc Fraser
- INRS-Institut Armand-Frappier, Université du Québec, Laval, Québec, Canada
- Centre de recherche interdisciplinaire sur le bien-être, la santé, la société et l'environnement, Université du Québec à Montréal, Montréal, Québec, Canada
| | - Marlène Fortier
- INRS-Institut Armand-Frappier, Université du Québec, Laval, Québec, Canada
| | - Delphine Foucher
- Département de chimie et de biochimie, Université de Moncton, Moncton, New Brunswick, Canada
| | | | - Pauline Brousseau
- INRS-Institut Armand-Frappier, Université du Québec, Laval, Québec, Canada
| | - Michel Fournier
- INRS-Institut Armand-Frappier, Université du Québec, Laval, Québec, Canada
| | - Céline Surette
- Centre de recherche interdisciplinaire sur le bien-être, la santé, la société et l'environnement, Université du Québec à Montréal, Montréal, Québec, Canada
- Département de chimie et de biochimie, Université de Moncton, Moncton, New Brunswick, Canada
| | - Cathy Vaillancourt
- INRS-Institut Armand-Frappier, Université du Québec, Laval, Québec, Canada
- Centre de recherche interdisciplinaire sur le bien-être, la santé, la société et l'environnement, Université du Québec à Montréal, Montréal, Québec, Canada
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15
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Mezghani-Chaari S, Machreki-Ajimi M, Hamza-Chaffai A, Minier C. High estradiol exposure disrupts the reproductive cycle of the clam Ruditapes decussatus in a sex-specific way. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:26670-26680. [PMID: 28956239 DOI: 10.1007/s11356-017-0146-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Accepted: 09/07/2017] [Indexed: 06/07/2023]
Abstract
Bivalve species may be susceptible to environmental estrogenic compounds including estradiol (E2). However, they are able to biotransform the hormone quite readily and inactivate its estrogenic action. To study the long-term effects of elevated free E2 tissue levels, we transiently exceeded the biotransformation capacity of the clam Ruditapes decussatus by exposing them with high E2 concentrations (400 ng/L) and subsequently study the consequences on gametogenesis during the following reproductive cycle. Exposure to 400 ngE2/L led to a significant increase in tissue free E2 levels, which reached 10-50 ng E2Eq/gww. No deleterious effect on gonado-somatic index (GSI), condition index (CI), or ability to respond to the stress on stress test could be detected after a month of exposure, suggesting the absence of negative effects on the clam's health. However, a marked increase in gametogenesis could be observed in both sexes during the exposure. Subsequent transplantation of the clams in the field allowed the normal development of the male clams and maturation of the gonads without any detrimental effect observed after 4 months. In contrast, in early July, all female clams formerly exposed to E2 showed lower health status, and only ovaries with atretic oocytes while all control and indigenous females were normal and mature. These results show a sex-specific effect of high E2 exposure and suggest either a direct or indirect role for E2 in R. decussatus' reproduction.
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Affiliation(s)
- Sawssan Mezghani-Chaari
- Unit of Marine and Environmental Toxicology, Sfax University, IPEIS, BP 1172, 3018, Sfax, Tunisia.
- Laboratory of Ecotoxicology, UMR-I 02 SEBIO, Normandie University, BP 540, 76058, Le Havre, France.
| | - Monia Machreki-Ajimi
- Unit of Marine and Environmental Toxicology, Sfax University, IPEIS, BP 1172, 3018, Sfax, Tunisia
| | - Amel Hamza-Chaffai
- Unit of Marine and Environmental Toxicology, Sfax University, IPEIS, BP 1172, 3018, Sfax, Tunisia
| | - Christophe Minier
- Laboratory of Ecotoxicology, UMR-I 02 SEBIO, Normandie University, BP 540, 76058, Le Havre, France
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Balbi T, Franzellitti S, Fabbri R, Montagna M, Fabbri E, Canesi L. Impact of bisphenol A (BPA) on early embryo development in the marine mussel Mytilus galloprovincialis: Effects on gene transcription. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2016; 218:996-1004. [PMID: 27569056 DOI: 10.1016/j.envpol.2016.08.050] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2016] [Revised: 08/18/2016] [Accepted: 08/21/2016] [Indexed: 05/20/2023]
Abstract
Bisphenol A (BPA), a monomer used in plastic manufacturing, is weakly estrogenic and a potential endocrine disruptor in mammals. Although it degrades quickly, it is pseudo-persistent in the environment because of continual inputs, with reported concentrations in aquatic environments between 0.0005 and 12 μg/L. BPA represents a potential concern for aquatic ecosystems, as shown by its reproductive and developmental effects in aquatic vertebrates. In invertebrates, endocrine-related effects of BPA were observed in different species and experimental conditions, with often conflicting results, indicating that the sensitivity to this compound can vary considerably among related taxa. In the marine mussel Mytilus galloprovincialis BPA was recently shown to affect early development at environmental concentrations. In this work, the possible effects of BPA on mussel embryos were investigated at the molecular level by evaluating transcription of 13 genes, selected on the basis of their biological functions in adult mussels. Gene expression was first evaluated in trocophorae and D-veligers (24 and 48 h post fertilization) grown in physiological conditions, in comparison with unfertilized eggs. Basal expressions showed a general up-regulation during development, with distinct transcript levels in trocophorae and D-veligers. Exposure of fertilized eggs to BPA (10 μg/L) induced a general upregulation at 24 h pf, followed by down regulation at 48 h pf. Mytilus Estrogen Receptors, serotonin receptor and genes involved in biomineralization (Carbonic Anydrase and Extrapallial Protein) were the most affected by BPA exposure. At 48 h pf, changes in gene expression were associated with irregularities in shell formation, as shown by scanning electron microscopy (SEM), indicating that the formation of the first shelled embryo, a key step in mussel development, represents a sensitive target for BPA. Similar results were obtained with the natural estrogen 17β-estradiol. The results demonstrate that BPA and E2 can affect Mytilus early development through dysregulation of gene transcription.
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Affiliation(s)
- Teresa Balbi
- Department of Earth, Environment and Life Sciences (DISTAV), University of Genoa, Corso Europa 26, 16132, Genova, Italy
| | - Silvia Franzellitti
- Department of Biological, Geological and Environmental Sciences, University of Bologna, Campus of Ravenna, via S. Alberto 163, 48123 Ravenna, Italy
| | - Rita Fabbri
- Department of Earth, Environment and Life Sciences (DISTAV), University of Genoa, Corso Europa 26, 16132, Genova, Italy
| | - Michele Montagna
- Department of Earth, Environment and Life Sciences (DISTAV), University of Genoa, Corso Europa 26, 16132, Genova, Italy
| | - Elena Fabbri
- Department of Biological, Geological and Environmental Sciences, University of Bologna, Campus of Ravenna, via S. Alberto 163, 48123 Ravenna, Italy.
| | - Laura Canesi
- Department of Earth, Environment and Life Sciences (DISTAV), University of Genoa, Corso Europa 26, 16132, Genova, Italy
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17
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Fraser M, Fortier M, Roumier PH, Parent L, Brousseau P, Fournier M, Surette C, Vaillancourt C. Sex determination in blue mussels: Which method to choose? MARINE ENVIRONMENTAL RESEARCH 2016; 120:78-85. [PMID: 27448778 DOI: 10.1016/j.marenvres.2016.07.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2016] [Revised: 07/08/2016] [Accepted: 07/11/2016] [Indexed: 06/06/2023]
Abstract
Sexing methods of blue mussels are mostly based on the presence or absence of gametes, and do not take into account reproductive cycle stages. Exposure effects can be affected by the sex of mussels, thus the aim of this study is to determine an efficient sex determination protocol taking into account the reproductive cycle stage. Eight mussel sexing methods were compared. This study demonstrates that the first step in discerning sex in blue mussels should be assessing the reproductive stage, which can be done by mantle histology. During gametogenesis, histology allows the differentiation of males from females by the observation of gametes. However, when mussels are in sexual rest, the only method that should be used is the sex-specific gene method.
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Affiliation(s)
- Marc Fraser
- INRS - Institut Armand-Frappier, Université du Québec, 531 boulevard des Prairies, Laval, QC, H7V 1B7, Canada; Center for Interdisciplinary Research on Well-Being, Health, Society and Environment (CINBIOSE), Université du Québec à Montréal, Montreal, QC, Canada
| | - Marlène Fortier
- INRS - Institut Armand-Frappier, Université du Québec, 531 boulevard des Prairies, Laval, QC, H7V 1B7, Canada
| | | | - Lise Parent
- Center for Interdisciplinary Research on Well-Being, Health, Society and Environment (CINBIOSE), Université du Québec à Montréal, Montreal, QC, Canada; Unité d'enseignement et de recherche science et technologie, Télé-université (TÉLUQ), Montreal, QC, H2S 3L5, Canada
| | - Pauline Brousseau
- INRS - Institut Armand-Frappier, Université du Québec, 531 boulevard des Prairies, Laval, QC, H7V 1B7, Canada
| | - Michel Fournier
- INRS - Institut Armand-Frappier, Université du Québec, 531 boulevard des Prairies, Laval, QC, H7V 1B7, Canada
| | - Céline Surette
- Center for Interdisciplinary Research on Well-Being, Health, Society and Environment (CINBIOSE), Université du Québec à Montréal, Montreal, QC, Canada; Département de chimie et de biochimie, Université de Moncton, Moncton, NB, E1A 3E9, Canada
| | - Cathy Vaillancourt
- INRS - Institut Armand-Frappier, Université du Québec, 531 boulevard des Prairies, Laval, QC, H7V 1B7, Canada; Center for Interdisciplinary Research on Well-Being, Health, Society and Environment (CINBIOSE), Université du Québec à Montréal, Montreal, QC, Canada.
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18
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Lewis SE, Freund JG, Wankowski JL, Baldridge MG. Correlations between estrogen and testosterone concentrations, pairing status and acanthocephalan infection in an amphipod. J Zool (1987) 2015. [DOI: 10.1111/jzo.12309] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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19
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Nagasawa K, Treen N, Kondo R, Otoki Y, Itoh N, Rotchell JM, Osada M. Molecular characterization of an estrogen receptor and estrogen-related receptor and their autoregulatory capabilities in two Mytilus species. Gene 2015; 564:153-9. [PMID: 25862924 DOI: 10.1016/j.gene.2015.03.073] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Revised: 01/27/2015] [Accepted: 03/03/2015] [Indexed: 12/23/2022]
Abstract
Vertebrate-like sex steroid hormones have been widely detected in mollusks, and numerous experiments have shown the importance of steroids in gonad development. Nevertheless, their signaling pathways in invertebrates have not been uncovered yet. Steroid receptors are an ancient class of transcription factors with multiple roles in not only vertebrates but also invertebrates. Estrogen signaling is thought to have major roles in mollusk physiology, but the full repertoire of estrogen receptors is unknown. We presented the successful cloning of two novel forms of estrogen receptor-like genes. These receptors are present in two closely related species of Mytilus: Mytilus edulis and Mytilus galloprovincialis, commonly known and widely distributed sentinel species. Our phylogenetic analysis revealed that one of these receptors is an estrogen receptor (ER) and the other one is an estrogen-related receptor (ERR). Studies of expression analysis showed that both receptor mRNAs were localized in the oocytes and follicle cells in contact with developing oocytes in the ovary and Sertoli cells in the testis, and in the ciliated cells of the gill. In addition, we have evidence that one (ER) of these may have a capacity to autoregulate its own expression in the gonadal cells by estrogen (E2) and that this gene is responsive to estrogenic compounds.
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Affiliation(s)
- Kazue Nagasawa
- Laboratory of Aquacultural Biology, Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidori-amamiyamachi, Sendai 981-8555, Japan
| | - Nicholas Treen
- Shimoda Marine Research Center, University of Tsukuba, 5-10-1 Shimoda, Shizuoka 415-0025, Japan
| | - Reki Kondo
- Laboratory of Aquacultural Biology, Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidori-amamiyamachi, Sendai 981-8555, Japan
| | - Yurika Otoki
- Laboratory of Aquacultural Biology, Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidori-amamiyamachi, Sendai 981-8555, Japan
| | - Naoki Itoh
- Laboratory of Aquacultural Biology, Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidori-amamiyamachi, Sendai 981-8555, Japan
| | - Jeanette M Rotchell
- School of Biological, Biomedical and Environmental Sciences, University of Hull, Cottingham Rd, Hull HU6 7RX, UK
| | - Makoto Osada
- Laboratory of Aquacultural Biology, Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidori-amamiyamachi, Sendai 981-8555, Japan.
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20
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Falfushynska HI, Gnatyshyna LL, Osadchuk OY, Farkas A, Vehovszky A, Carpenter DO, Gyori J, Stoliar OB. Diversity of the molecular responses to separate wastewater effluents in freshwater mussels. Comp Biochem Physiol C Toxicol Pharmacol 2014; 164:51-8. [PMID: 24816276 DOI: 10.1016/j.cbpc.2014.04.007] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/12/2014] [Revised: 04/22/2014] [Accepted: 04/29/2014] [Indexed: 01/14/2023]
Abstract
The environmental safety of pharmaceutical and personal care products (PPCPs) requires a crucial examination. The aim of this study was to evaluate the responses of biomarkers of stress and toxicity in freshwater mussels to the effect of commonly found PPCPs in wastewater. We treated male mussels Unio tumidus, from an undisturbed site with ibuprofen (IBU, 250 ng L(-1)), triclosan (TCS, 500 ng L(-1)), or estrone (E1, 100 ng L(-1)) for 14 days. Untreated mussels from this site (C) and mussels inhabiting a polluted area (P) were also examined after a similar time of being kept in the laboratory. The consequences of chronic exposure of the mussels in the P-group were reflected in elevated concentrations of oxyradicals (1.4 times), oxidized glutathione (4.3 times), lipofuscin (2.2 times), and DNA-strand breaks in the digestive gland (DG) in comparison to the C-group, higher levels of caspase-3 activity in the DG, and vitellogenin-like proteins in gonads among all studied groups. Exposed mussels demonstrated some common responses with mussels in the P-group: elevated levels of lactate/pyruvate ratio, lipofuscin (IBU and E1), DNA fragmentation (TCS and E1), and caspase-3 activity (TCS and E1). Exposed to PPCPs mussels also showed elevation of ethoxyresorufin-O-deethylase and/or glutathione-S-transferase activity in the DG and a decrease in lysosomal stability in hemocytes (TCS and E1). The TCS group was distinguished by having the highest level of DNA-fragmentation and the lowest concentrations of total glutathione, oxyradicals, lipofuscin, pyruvate, and lactate, reflecting total metabolic depression. These results show that selected PPCPs at low concentrations alter a variety of physiological processes in this animal model system.
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Affiliation(s)
- Halina I Falfushynska
- Research Laboratory of Comparative Biochemistry and Molecular Biology, Ternopil National Pedagogical University, M. Kryvonosa Str., 2, Ternopil, 46027, Ukraine
| | - Lesya L Gnatyshyna
- Research Laboratory of Comparative Biochemistry and Molecular Biology, Ternopil National Pedagogical University, M. Kryvonosa Str., 2, Ternopil, 46027, Ukraine
| | - Olesya Y Osadchuk
- Research Laboratory of Comparative Biochemistry and Molecular Biology, Ternopil National Pedagogical University, M. Kryvonosa Str., 2, Ternopil, 46027, Ukraine
| | - Anna Farkas
- Balaton Limnological Institute, Centre for Ecological Research, Hungarian Academy of Sciences, Klebelsberg str. 3, Tihany 8237, Hungary
| | - Agnes Vehovszky
- Balaton Limnological Institute, Centre for Ecological Research, Hungarian Academy of Sciences, Klebelsberg str. 3, Tihany 8237, Hungary
| | - David O Carpenter
- Institute for Health and the Environment, University at Albany, Rensselaer, NY 12144, USA
| | - Janos Gyori
- Balaton Limnological Institute, Centre for Ecological Research, Hungarian Academy of Sciences, Klebelsberg str. 3, Tihany 8237, Hungary
| | - Oksana B Stoliar
- Research Laboratory of Comparative Biochemistry and Molecular Biology, Ternopil National Pedagogical University, M. Kryvonosa Str., 2, Ternopil, 46027, Ukraine.
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21
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Wang Q, He M. Molecular characterization and analysis of a putative 5-HT receptor involved in reproduction process of the pearl oyster Pinctada fucata. Gen Comp Endocrinol 2014; 204:71-9. [PMID: 24852353 DOI: 10.1016/j.ygcen.2014.05.010] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/12/2013] [Revised: 04/18/2014] [Accepted: 05/06/2014] [Indexed: 11/24/2022]
Abstract
5-HT (5-hydroxytryptamine; serotonin) has been linked to a variety of biological roles including gonad maturation and sequential spawning in bivalve molluscs. To gain a better understanding of the effects of 5-HT on developmental regulation in the pearl oyster Pinctada fucata, the isolation, cloning, and expression of the 5-HT receptor was investigated in this study. A full-length cDNA (2541 bp) encoding a putative 5-HT receptor (5-HTpf) of 471 amino acids was isolated from the ovary of the pearl oyster. It shared 71% and 51% homology, respectively, with the Crassostrea gigas 5-HT receptor and the Aplysia californica 5-HT1ap. The 5-HTpf sequence possessed the typical characteristics of seven transmembrane domains and a long third inner loop. Phylogenetic analysis also indicated that 5-HTpf was classified into the 5-HT1 subtype together with other invertebrate 5-HT1 receptors. Quantitative RT-PCR showed that 5-HTpf is widely expressed in all tissues tested, is involved in the gametogenesis cycle, embryonic and larval development stages, and expression is induced by E2 in ovarian tissues. These results suggest that 5-HTpf is involved in the reproductive process, specifically in the induction of oocyte maturation and spawning of P. fucata.
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Affiliation(s)
- Qi Wang
- CAS Key Laboratory of Tropical Marine Bio-Resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, 164 West Xingang Road, Guangzhou 510301, China; University of Chinese Academy of Sciences, Beijing 100039, China
| | - Maoxian He
- CAS Key Laboratory of Tropical Marine Bio-Resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, 164 West Xingang Road, Guangzhou 510301, China.
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22
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Franzellitti S, Buratti S, Capolupo M, Du B, Haddad SP, Chambliss CK, Brooks BW, Fabbri E. An exploratory investigation of various modes of action and potential adverse outcomes of fluoxetine in marine mussels. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2014; 151:14-26. [PMID: 24361074 DOI: 10.1016/j.aquatox.2013.11.016] [Citation(s) in RCA: 82] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2013] [Revised: 11/18/2013] [Accepted: 11/25/2013] [Indexed: 05/27/2023]
Abstract
The present study investigated possible adverse outcome pathways (AOPs) of the antidepressant fluoxetine (FX) in the marine mussel Mytilus galloprovincialis. An evaluation of molecular endpoints involved in modes of action (MOAs) of FX and biomarkers for sub-lethal toxicity were explored in mussels after a 7-day administration of nominal FX concentrations encompassing a range of environmentally relevant values (0.03-300ng/L). FX bioaccumulated in mussel tissues after treatment with 30 and 300ng/L FX, resulting in bioconcentration factor (BCF) values ranging from 200 to 800, which were higher than expected based solely on hydrophobic partitioning models. Because FX acts as a selective serotonin (5-HT) re-uptake inhibitor increasing serotonergic neurotransmission at mammalian synapses, cell signaling alterations triggered by 5-HT receptor occupations were assessed. cAMP levels and PKA activities were decreased in digestive gland and mantle/gonads of FX-treated mussels, consistent with an increased occupation of 5-HT1 receptors negatively coupled to the cAMP/PKA pathway. mRNA levels of a ABCB gene encoding the P-glycoprotein were also significantly down-regulated. This membrane transporter acts in detoxification towards xenobiotics and in altering pharmacokinetics of antidepressants; moreover, it is under a cAMP/PKA transcriptional regulation in mussels. Potential stress effects of FX were investigated using a battery of biomarkers for mussel health status that included lysosomal parameters, antioxidant enzyme activities, lipid peroxidation, and acetylcholinesterase activity. FX reduced the health status of mussels and induced lysosomal alterations, as suggested by reduction of lysosomal membrane stability in haemocytes and by lysosomal accumulation of neutral lipids in digestive gland. No clear antioxidant responses to FX were detected in digestive gland, while gills displayed significant increases of catalase and glutathione-s-transferase activities and a significant decrease of acetylcholinesterase activity. Though AOPs associated with mammalian therapeutic MOAs remain important during assessments of pharmaceutical hazards in the environment, this study highlights the importance of considering additional MOAs and AOPs for FX, particularly in marine mussels.
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Affiliation(s)
- Silvia Franzellitti
- University of Bologna, Interdepartment Centre for Environmental Science Research, via S. Alberto 163, 48123 Ravenna, Italy; University of Bologna, Department of Biological, Geological, and Environmental Sciences, via Selmi 3, 40100 Bologna, Italy.
| | - Sara Buratti
- University of Bologna, Interdepartment Centre for Environmental Science Research, via S. Alberto 163, 48123 Ravenna, Italy
| | - Marco Capolupo
- University of Bologna, Interdepartment Centre for Environmental Science Research, via S. Alberto 163, 48123 Ravenna, Italy
| | - Bowen Du
- Department of Environmental Science, Baylor University, Waco, TX 76798, USA
| | - Samuel P Haddad
- Department of Environmental Science, Baylor University, Waco, TX 76798, USA
| | - C Kevin Chambliss
- Department of Chemistry and Biochemistry, Baylor University, Waco, TX 76798, USA
| | - Bryan W Brooks
- Department of Environmental Science, Baylor University, Waco, TX 76798, USA
| | - Elena Fabbri
- University of Bologna, Interdepartment Centre for Environmental Science Research, via S. Alberto 163, 48123 Ravenna, Italy; University of Bologna, Department of Biological, Geological, and Environmental Sciences, via Selmi 3, 40100 Bologna, Italy
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Franzellitti S, Buratti S, Valbonesi P, Fabbri E. The mode of action (MOA) approach reveals interactive effects of environmental pharmaceuticals on Mytilus galloprovincialis. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2013; 140-141:249-256. [PMID: 23831970 DOI: 10.1016/j.aquatox.2013.06.005] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2013] [Revised: 06/04/2013] [Accepted: 06/07/2013] [Indexed: 06/02/2023]
Abstract
Aquatic organisms are unintentionally exposed to a large number of pharmaceutical residues in their natural habitats. Ecotoxicological studies have agreed that these compounds are not harmful to aquatic organisms, as their environmental concentrations are typically too low. However, recent reports have shown biological effects at such low concentrations when biological endpoints related to the therapeutic effects are assessed. Therefore, conservation of molecular targets is now addressed as a key aspect for the development of more efficient test strategies for pharmaceutical environmental risk assessment, providing the rationale for the mode of action (MOA) approach. In the present study the MOA approach was used to investigate the interactive effects of fluoxetine (FX) and propranolol (PROP) on the Mediterranean mussels (Mytilus galloprovincialis). Indeed, organisms in the environment are exposed to pharmaceutical mixtures throughout their lifetime, and particular combinations may be of concern. The antidepressant FX increases serotonin (5-HT) levels in the synaptic cleft by inhibiting 5-HT reuptake. PROP, a prototypical β-adrenoceptor antagonist, also blocks 5-HT1 receptors, which are negatively coupled to cAMP-mediated signaling. Cell signaling alterations potentially triggered by 5-HT1 receptor occupation were therefore assessed after a 7-day mussel exposure to FX or PROP, alone or in combination, each at 0.3 ng/L concentration. FX decreased cAMP levels and PKA activities in digestive gland and mantle/gonads, in agreement with an increased occupation of 5-HT1 receptors. PROP caused a decrease in cAMP levels and PKA activities in digestive gland and an increase in cAMP levels in mantle/gonads, consistent with a differential expression of adrenergic and 5-HT receptors in the two tissues. Co-exposure to FX and PROP provides significant indications for antagonistic effects of the pharmaceuticals, consistent with a direct (PROP) and indirect (FX) action on the same molecular target. Interestingly, FX induced over-expression of a 5-HT1 gene product, and PROP counteracted such increase when the mixture was administered, while having per se no effect. Finally, mRNA expression of the ABCB gene encoding the MXR-related transporter P-glycoprotein was reduced by both pharmaceuticals in the digestive gland, while decreased by FX, increased by PROP, and not affected by the mixture in mantle/gonads. Since transcription of this gene product is under cAMP/PKA modulation, the impairment of regulatory pathways triggered by low concentrations of pharmaceuticals have the potential to affect the ability of animals to elaborate strategies of defense or adaptation toward further stress factors. In this specific case, the pharmaceutical mixture limits the detrimental effects of the single compounds.
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Affiliation(s)
- Silvia Franzellitti
- University of Bologna, Interdepartment Centre for Environmental Science Research, via S. Alberto 163, 48123 Ravenna, Italy.
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Franzellitti S, Fabbri E. Cyclic-AMP mediated regulation of ABCB mRNA expression in mussel haemocytes. PLoS One 2013; 8:e61634. [PMID: 23593491 PMCID: PMC3625153 DOI: 10.1371/journal.pone.0061634] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2012] [Accepted: 03/11/2013] [Indexed: 11/29/2022] Open
Abstract
Background The multixenobiotic resistance system (MXR) allows aquatic organisms to cope with their habitat despite high pollution levels by over-expressing membrane and intracellular transporters, including the P-glycoprotein (Pgp). In mammals transcription of the ABCB1 gene encoding Pgp is under cAMP/PKA-mediated regulation; whether this is true in mollusks is not fully clarified. Methodology/Principal Findings cAMP/PKA regulation and ABCB mRNA expression were assessed in haemocytes from Mediterranean mussels (Mytilus galloprovincialis) exposed in vivo for 1 week to 0.3 ng/L fluoxetine (FX) alone or in combination with 0.3 ng/L propranolol (PROP). FX significantly decreased cAMP levels and PKA activity, and induced ABCB mRNA down-regulation. FX effects were abolished in the presence of PROP. In vitro experiments using haemocytes treated with physiological agonists (noradrenaline and serotonin) and pharmacological modulators (PROP, forskolin, dbcAMP, and H89) of the cAMP/PKA system were performed to obtain clear evidence about the involvement of the signaling pathway in the transcriptional regulation of ABCB. Serotonin (5-HT) decreased cAMP levels, PKA activity and ABCB mRNA expression but increased the mRNA levels for a putative 5-HT1 receptor. Interestingly, 5-HT1 was also over-expressed after in vivo exposures to FX. 5-HT effects were counteracted by PROP. Forskolin and dbcAMP increased PKA activity as well as ABCB mRNA expression; the latter effect was abolished in the presence of the PKA inhibitor H89. Conclusions This study provides the first direct evidence for the cAMP/PKA-mediated regulation of ABCB transcription in mussels.
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MESH Headings
- 5' Untranslated Regions/genetics
- ATP Binding Cassette Transporter, Subfamily B, Member 1/genetics
- ATP Binding Cassette Transporter, Subfamily B, Member 1/metabolism
- Animals
- Bucladesine/pharmacology
- Colforsin/pharmacology
- Cyclic AMP/pharmacology
- Cyclic AMP-Dependent Protein Kinases/antagonists & inhibitors
- Cyclic AMP-Dependent Protein Kinases/metabolism
- Fluoxetine/pharmacology
- Gene Expression Regulation/drug effects
- Hemocytes/drug effects
- Hemocytes/metabolism
- Humans
- Isoquinolines/pharmacology
- Models, Biological
- Mytilus/drug effects
- Mytilus/enzymology
- Mytilus/genetics
- Norepinephrine/pharmacology
- Promoter Regions, Genetic/genetics
- Propranolol/pharmacology
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Receptors, Serotonin, 5-HT1/genetics
- Receptors, Serotonin, 5-HT1/metabolism
- Sequence Analysis, DNA
- Serotonin/metabolism
- Serotonin Receptor Agonists/pharmacology
- Signal Transduction/drug effects
- Signal Transduction/genetics
- Sulfonamides/pharmacology
- Up-Regulation/drug effects
- Up-Regulation/genetics
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Affiliation(s)
- Silvia Franzellitti
- Interdepartment Centre for Environmental Science Research, University of Bologna, Ravenna, Italy.
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25
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Scott AP. Do mollusks use vertebrate sex steroids as reproductive hormones? II. Critical review of the evidence that steroids have biological effects. Steroids 2013; 78:268-81. [PMID: 23219696 DOI: 10.1016/j.steroids.2012.11.006] [Citation(s) in RCA: 99] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/12/2012] [Revised: 10/22/2012] [Accepted: 11/02/2012] [Indexed: 01/02/2023]
Abstract
In assessing the evidence as to whether vertebrate sex steroids (e.g. testosterone, estradiol, progesterone) have hormonal actions in mollusks, ca. 85% of research papers report at least one biological effect; and 18 out of 21 review papers (published between 1970 and 2012) express a positive view. However, just under half of the research studies can be rejected on the grounds that they did not actually test steroids, but compounds or mixtures that were only presumed to behave as steroids (or modulators of steroids) on the basis of their effects in vertebrates (e.g. Bisphenol-A, nonylphenol and sewage treatment effluents). Of the remaining 55 papers, some can be criticized for having no statistical analysis; some for using only a single dose of steroid; others for having irregular dose-response curves; 40 out of the 55 for not replicating the treatments; and 50 out of 55 for having no within-study repetition. Furthermore, most studies had very low effect sizes in comparison to fish-based bioassays for steroids (i.e. they had a very weak 'signal-to-noise' ratio). When these facts are combined with the fact that none of the studies were conducted with rigorous randomization or 'blinding' procedures (implying the possibility of 'operator bias') one must conclude that there is no indisputable bioassay evidence that vertebrate sex steroids have endocrinological or reproductive roles in mollusks. The only observation that has been independently validated is the ability of estradiol to trigger rapid (1-5 min) lysosomal membrane breakdown in hemocytes of Mytilus spp. This is a typical 'inflammatory' response, however, and is not proof that estradiol is a hormone - especially when taken in conjunction with the evidence (discussed in a previous review) that mollusks have neither the enzymes necessary to synthesize vertebrate steroids nor nuclear receptors with which to respond to them.
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Affiliation(s)
- Alexander P Scott
- Centre for Environment, Fisheries and Aquaculture Science, Weymouth, Dorset, UK.
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26
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St-Hilaire S, Ezike VO, Stryhn H, Thomas MA. An ecological study on childhood autism. Int J Health Geogr 2012; 11:44. [PMID: 23051560 PMCID: PMC3504530 DOI: 10.1186/1476-072x-11-44] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2012] [Accepted: 10/07/2012] [Indexed: 12/29/2022] Open
Abstract
BACKGROUND AND METHODS Idiopathic autism, suspected to be caused by exposure of genetically susceptible individuals to unknown environmental triggers, has increased dramatically in the past 25 years. The objectives of our study were to determine, using a linear regression model, whether the county prevalence of autism in the Pacific Northwest of the United States was associated with the source of drinking water for that county and whether this relationship was dependent on the level of environmental pollutants and meteorological factors in the county. RESULTS We found the previously reported relationship between precipitation and autism in a county was dependent on the amount of drinking water derived from surface sources in the county. We also found a positive association between the EPA's risk of neurological disease and autism, but this relationship was only present in warm areas. CONCLUSIONS Our study provides evidence for the hypothesis that environmental factors are associated with autism and that meteorological factors play a role in this relationship.
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Affiliation(s)
- Sophie St-Hilaire
- Department of Health Management, Atlantic Veterinary College, University of Prince Edward Island, 550 University Avenue, Charlottetown, PE C1A 4P3, Canada.
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27
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Thermal preferences of wintering snails Planorbarius corneus (L.) exposed to lipopolysaccharide and zymosan. J Invertebr Pathol 2012; 112:57-61. [PMID: 22985901 DOI: 10.1016/j.jip.2012.08.011] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2012] [Revised: 06/28/2012] [Accepted: 08/23/2012] [Indexed: 11/20/2022]
Abstract
Fever is regarded as a physiological response to infection both in endothermic and ectothermic animals. In ectotherms, fevers are achieved only behaviorally, and has been described in many vertebrates' and few invertebrates' groups. In snails only symptoms of reverse fever as a response to trematode invasion were found. Present work reports on the effects of two different pyrogens - lipopolysaccharide extracted from Escherichia coli (LPS), and zymosan - from Saccharomyces cerevisiae on the thermal behavior of wintering (studied during a winter season) specimens of the Planorbarius corneus (L.). Using the thermal gradient protocol we demonstrate that the individuals of this snail species responded with behavioral fevers to dosages of pyrogens. LPS injection to the surface of the snail's foot at a dose of 10 μg/g resulted in a significant increase in preferred temperature at 5h after injection. Similarly zymosan at a dose of 0.5 and 1.0 μg/g - caused fever at 8h and 9h respectively. Average temperature chosen by feverish animals after latency period reached 28.7±0.41 °C (LPS), 28.1±0.43 °C (zymosan 1.0 μg/g) or 25.5±0.33 °C (zymosan 0.5 μg/g). We conclude, therefore, that snails are capable of reacting with fever to selected pathogen associated factors, and P. corneus can be used as a model to study a behavioral fever phenomenon in invertebrate animals.
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28
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Ciacci C, Barmo C, Gallo G, Maisano M, Cappello T, D'Agata A, Leonzio C, Mauceri A, Fasulo S, Canesi L. Effects of sublethal, environmentally relevant concentrations of hexavalent chromium in the gills of Mytilus galloprovincialis. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2012; 120-121:109-118. [PMID: 22673405 DOI: 10.1016/j.aquatox.2012.04.015] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2012] [Revised: 03/26/2012] [Accepted: 04/24/2012] [Indexed: 06/01/2023]
Abstract
Hexavalent chromium Cr(VI) is an important contaminant released from both domestic and industrial effluents, and represents the predominant chemical form of the metal in aquatic ecosystems. In the marine bivalve Mytilus galloprovincialis exposure to non-toxic, environmentally relevant concentrations of Cr(VI) was shown to modulate functional parameters and gene expression in both the digestive gland and hemocytes. In this work, the effects of exposure to Cr(VI) (0.1-1-10 μg L(-1) animal(-1) for 96 h) in mussel gills were investigated. Gill morphology and immunolocalization of GSH-transferase (GST), of components involved in cholinergic (AChE and ChAT), adrenergic (TH) and serotoninergic (5-HT(3) receptor) systems, regulating gill motility, were evaluated. Total glutathione content, activities of GSH-related enzymes (glutathione reductase - GSR, GST), of catalase, and of key glycolytic enzymes (phosphofructokinase - PFK and pyruvate kinase - PK) were determined. Moreover, mRNA expression of selected Mytilus genes (GST-π, metallothionein isoforms MT10 and MT20, HSP70 and 5-HT receptor) was assessed by RT-q-PCR. Cr(VI) exposure induced progressive changes in gill morphology and in immunoreactivity to components involved in neurotransmission that were particularly evident at the highest concentration tested, and associated with large metal accumulation. Cr(VI) increased the activities of GST and GSR, and total glutathione content to a different extent at different metal concentrations, this suggesting Cr(VI) detoxication/reduction at the site of metal entry. Cr(VI) exposure also increased the activity of glycolytic enzymes, indicating modulation of carbohydrate metabolism. Significant changes in transcription of different genes were observed. In particular, the mRNA level for the 5-HTR was increased, whereas both decreases and increases were observed for GST-π, MT10, MT20 and HSP70 mRNAs, showing sex- and concentration-related differences. The results demonstrate that Cr(VI) significantly affected functional and molecular parameters in mussel gills, and indicate that this tissue represents the major target of exposure to environmentally relevant concentrations of the metal.
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Affiliation(s)
- Caterina Ciacci
- DISTEVA, Dipartimento di Scienze della Terra, della Vita e dell'Ambiente, Università Carlo Bo di Urbino, Italy
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29
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Cubero-Leon E, Minier C, Rotchell JM, Hill EM. Metabolomic analysis of sex specific metabolites in gonads of the mussel, Mytilus edulis. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY D-GENOMICS & PROTEOMICS 2012; 7:212-9. [DOI: 10.1016/j.cbd.2012.03.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2012] [Revised: 03/12/2012] [Accepted: 03/12/2012] [Indexed: 12/24/2022]
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30
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Lazzara R, Blázquez M, Porte C, Barata C. Low environmental levels of fluoxetine induce spawning and changes in endogenous estradiol levels in the zebra mussel Dreissena polymorpha. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2012; 106-107:123-130. [PMID: 22155424 DOI: 10.1016/j.aquatox.2011.11.003] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2011] [Revised: 11/04/2011] [Accepted: 11/08/2011] [Indexed: 05/31/2023]
Abstract
The pharmaceutical fluoxetine, a selective serotonin reuptake inhibitor (SSRI), is often detected in municipal wastewater treatment plant effluents and surface waters within the ng/l range. There is, however, insufficient research evaluating potential hazards of fluoxetine in aquatic organisms at environmentally relevant concentrations. Taking into account that several SSRIs (fluoxetine, fluvoxamine) act as spawning inducers in bivalves, this study aimed at investigating the effects of fluoxetine exposure in the zebra mussel (Dreissena polymorpha) by assessing its potential to induce spawning at environmentally relevant concentrations (20 and 200 ng/l), as well as alterations of endogenous levels of testosterone and estradiol. Histological analyses of female and male gonads showed a concentration dependent decrease of oocyte and spermatozoan density, with a reduction in the number of oocytes per follicle of 40-70%, and spermatozoan density of 21-25%, relative to controls, following exposure to 20 and 200 ng/l of fluoxetine for 6 days, respectively. There was also a significant increase (1.5-fold) in the endogenous level of esterified estradiol in organisms exposed to 200 ng/l fluoxetine. Overall, the study shows that exposure to low levels of fluoxetine may effectively induce gamete liberation in the zebra mussel as well as alter endogenous levels of estradiol, and evidences the need of further investigating the potential of fluoxetine to alter the endocrine system of molluscs at environmentally relevant concentrations.
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Affiliation(s)
- Raimondo Lazzara
- Environmental Chemistry Department, IDAEA-CSIC, Consejo Superior de Investigaciones Científicas, C/Jordi Girona 18, 08034 Barcelona, Spain
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31
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Ciacci C, Barmo C, Fabbri R, Canonico B, Gallo G, Canesi L. Immunomodulation in Mytilus galloprovincialis by non-toxic doses of hexavalent chromium. FISH & SHELLFISH IMMUNOLOGY 2011; 31:1026-1033. [PMID: 21925273 DOI: 10.1016/j.fsi.2011.09.002] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2011] [Revised: 07/18/2011] [Accepted: 09/06/2011] [Indexed: 05/31/2023]
Abstract
In aquatic organisms, the immune function can be affected by exposure to environmental pollutants, including heavy metals. In vertebrate systems, different forms of Cr have been shown induce either immunostimulatory or immunosuppressive processes. Hexavalent Cr, Cr(VI), is an important contaminant released from both domestic and industrial effluents, and the predominant chemical form of the metal in aquatic ecosystems. In this work, the in vitro and in vivo effects of Cr(VI) on immune parameters of the marine bivalve Mytilus galloprovincialis were evaluated. Hemocyte incubation with different concentrations of Cr(VI) (0.1-1-10-100 μM) induced a dose-dependent decrease in lysosomal membrane stability (LMS). Decreases in extracellular lysozyme release and phagocytic activity were also observed, with stronger effects at lower metal concentrations. On the other hand, in these conditions, Cr(VI) stimulated extracellular superoxide production and nitrite accumulation. The effects of Cr(VI) were also evaluated in mussels exposed to the metal (0.1-1-10 μg L(-1), corresponding to nanomolar concentrations) for 96 h. Decreases in hemocyte LMS values and in serum lysozyme activity were observed with increasing metal concentrations. Decreased phagocytic activity and increased NO production were recorded, with stronger effects at lower concentrations. In these conditions, decreased Total Hemocyte Counts (THC), but no necrotic/apoptotic processes were observed. Moreover, Cr(VI) at both 0.1 and 1 μg L(-1) seemed to induce significant changes in transcription of immune genes (lysozyme, Mytilin C, Myticin B, defensin, MgC1q), of the serotonin receptor (5-HTR) and of the stress protein HSP70, whereas that of the anti-apoptotic gene p53 was unaffected. Overall, the results indicate that exposure to non-toxic, environmentally relevant concentrations of Cr(VI) can modulate functional and molecular immune parameters in M. galloprovincialis.
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Affiliation(s)
- C Ciacci
- DISUAN, Dipartimento di Scienze dell'Uomo, dell'Ambiente e della Natura, Università Carlo Bo di Urbino, Italy
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Cubero-Leon E, Ciocan CM, Minier C, Rotchell JM. Reference gene selection for qPCR in mussel, Mytilus edulis, during gametogenesis and exogenous estrogen exposure. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2011; 19:2728-2733. [PMID: 22293909 DOI: 10.1007/s11356-012-0772-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2011] [Accepted: 01/16/2012] [Indexed: 05/31/2023]
Abstract
PURPOSE The aim of this study is to develop a normalization method for real-time PCR data by analyzing the most stably expressed control genes in mussel (Mytilus edulis) reproductive tissue. METHODS To facilitate this, six candidate genes, including several commonly used in the literature, were investigated in mussels at different stages of gametogenesis and following experimental exposure to a model estrogen (17b-estradiol). GeNorm and NormFinder softwares were employed to assess the stability of the reference genes. RESULTS Our results demonstrate that the most stable reference genes are not the same in mussels at different stages of gametogenesis and in experimentally E2-exposed mussels. Interestingly, HEL (helicase) and ACT (actin) mRNA expression levels were most affected by the stage of gametogenesis and yet, in molluscan studies, ACT is possibly the most frequently used reference gene. CONCLUSIONS We demonstrate that the experimental results are highly dependent on the reference gene chosen and that statistically significant contrasting differences between sample groups are present or absent depending on the reference gene employed.
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Affiliation(s)
- Elena Cubero-Leon
- Department of Biology and Environmental Science, University of Sussex, Falmer, Brighton BN1 9QJ, UK
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33
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Identification of reproduction-specific genes associated with maturation and estrogen exposure in a marine bivalve Mytilus edulis. PLoS One 2011; 6:e22326. [PMID: 21818309 PMCID: PMC3144882 DOI: 10.1371/journal.pone.0022326] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2011] [Accepted: 06/26/2011] [Indexed: 11/26/2022] Open
Abstract
Background While it is established that vertebrate-like steroids, particularly estrogens (estradiol, estrone) and androgens (testosterone), are present in various tissues of molluscs, it is still unclear what role these play in reproductive endocrinology in such organisms. This is despite the significant commercial shellfishery interest in several bivalve species and their decline. Methodology/Principal Findings Using suppression subtraction hybridisation of mussel gonad samples at two stages (early and mature) of gametogenesis and (in parallel) following controlled laboratory estrogen exposure, we isolate several differentially regulated genes including testis-specific kinases, vitelline lysin and envelope sequences. Conclusions The differentially expressed mRNAs isolated provide evidence that mussels may be impacted by exogenous estrogen exposure.
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Canesi L, Negri A, Barmo C, Banni M, Gallo G, Viarengo A, Dondero F. The organophosphate Chlorpyrifos interferes with the responses to 17β-estradiol in the digestive gland of the marine mussel Mytilus galloprovincialis. PLoS One 2011; 6:e19803. [PMID: 21625485 PMCID: PMC3098840 DOI: 10.1371/journal.pone.0019803] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2010] [Accepted: 04/06/2011] [Indexed: 01/12/2023] Open
Abstract
Background Many pesticides have been shown to act as endocrine disrupters. Although the
potencies of currently used pesticides as hormone agonists/antagonists are
low compared with those of natural ligands, their ability to act via
multiple mechanisms might enhance the biological effect. The organophosphate
Chlorpyrifos (CHP) has been shown to be weakly estrogenic and cause adverse
neurodevelopmental effects in mammals. However, no information is available
on the endocrine effects of CHP in aquatic organisms. In the digestive gland
of the bivalve Mytilus galloprovincialis, a target tissue
of both estrogens and pesticides, the possible effects of CHP on the
responses to the natural estrogen 17β-estradiol (E2) were
investigated. Methodology/Principal Findings Mussels were exposed to CHP (4.5 mg/l, 72 hrs) and subsequently injected with
E2 (6.75 ng/g dw). Responses were evaluated in CHP,
E2 and CHP/E2 treatment groups at 24 h p.i. by a
biomarker/transcriptomic approach. CHP and E2 induced additive,
synergistic, and antagonistic effects on lysosomal biomarkers (lysosomal
membrane stability, lysosome/cytoplasm volume ratio, lipofuscin and neutral
lipid accumulation). Additive and synergistic effects were also observed on
the expression of estrogen-responsive genes (GSTπ, catalase, 5-HTR)
evaluated by RT-Q-PCR. The use of a 1.7K cDNA Mytilus
microarray showed that CHP, E2 and CHP/E2, induced 81,
44, and 65 Differentially Expressed Genes (DEGs), respectively. 24 genes
were exclusively shared between CHP and CHP/E2, only 2 genes
between E2 and CHP/E2. Moreover, 36 genes were
uniquely modulated by CHP/E2. Gene ontology annotation was used
to elucidate the putative mechanisms involved in the responses elicited by
different treatments. Conclusions The results show complex interactions between CHP and E2 in the
digestive gland, indicating that the combination of certain pesticides and
hormones may give rise to unexpected effects at the molecular/cellular
level. Overall, these data demonstrate that CHP can interfere with the
mussel responses to natural estrogens.
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Affiliation(s)
- Laura Canesi
- Dipartimento di Biologia, Università di Genova, Genova, Italy.
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Barmo C, Ciacci C, Fabbri R, Olivieri S, Bianchi N, Gallo G, Canesi L. Pleiotropic effects of hexavalent chromium (CrVI) in Mytilus galloprovincialis digestive gland. CHEMOSPHERE 2011; 83:1087-1095. [PMID: 21316074 DOI: 10.1016/j.chemosphere.2011.01.037] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2010] [Revised: 01/11/2011] [Accepted: 01/14/2011] [Indexed: 05/30/2023]
Abstract
Hexavalent Chromium Cr(VI) is an important contaminant considered as a model oxidative toxicant released from both domestic and industrial effluents, and represents the predominant chemical form of the metal in aquatic ecosystems. On the other hand, in mammals the reduced form Cr(III) is considered an essential microelement, involved in regulation of lipid and carbohydrate metabolism; moreover, recent evidence suggests that Cr may have endocrine effects. In this work, the effects of Cr(VI) were investigated in the digestive gland of the marine bivalve Mytilus galloprovincialis. Mussels were exposed to 0.1-1-10-100 μg Cr(VI) L(-1) animal(-1) for 96 h. At 100 μg L(-1), a large increase in total Cr tissue content was observed; in these conditions, the lysosomal membranes were completely destabilized, whereas other lysosomal biomarkers (neutral lipids-NL and lipofuscin-LF), as well as different enzyme activities and gene expression were unaffected, this indicating severe stress conditions in the tissue. On the other hand, at lower concentrations, changes in other histochemical, biochemical and molecular endpoints were observed. In particular, at both 1 and 10 μg L(-1), lysosomal destabilization was associated with significant NL and LF accumulation; however, no changes in catalase and GSH transferase (GST) activities were observed. At the same concentrations, GSSG reductase (GSR) activity was significantly increased, this probably reflecting the recycling of GSSG produced in the GSH-mediated intracellular reduction of Cr(VI). Increased activities of the key glycolytic enzymes PFK (phosphofructokinase) and PK (pyruvate kinase) were also observed, indicating that Cr(VI) could affect carbohydrate metabolism. Cr(VI) induced downregulation or no effects on the expression of metallothioneins MT10 and MT20, except for an increase in MT20 transcription in males. Moreover, significant up-regulation of the Mytilus estrogen receptor MeER2 and serotonin receptor (5-HTR) were observed in both sexes. The results demonstrate that exposure to Cr(VI) in the low ppb range did not result in strong toxicity or oxidative stress conditions in mussel digestive gland. On the other hand, our data support the hypothesis that low concentrations of the metal can exert pleiotropic effects on mussel physiology, from modulation of lipid and carbohydrate metabolism, to effects on the expression of estrogen-responsive genes.
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Affiliation(s)
- Cristina Barmo
- Dipartimento di Biologia, Università di Genova, Corso Europa 26, 16132 Genova, Italy
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Franzellitti S, Buratti S, Valbonesi P, Capuzzo A, Fabbri E. The β-blocker propranolol affects cAMP-dependent signaling and induces the stress response in Mediterranean mussels, Mytilus galloprovincialis. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2011; 101:299-308. [PMID: 21216339 DOI: 10.1016/j.aquatox.2010.11.001] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2010] [Revised: 09/23/2010] [Accepted: 11/03/2010] [Indexed: 05/30/2023]
Abstract
Widespread occurrence of pharmaceuticals is reported in aquatic systems, posing concerns for the health of aquatic wildlife and a theoretical risk to humans. A recent concept was developed for the identification of highly active compounds amongst the environmental pharmaceuticals, based on their mode of action, the homology between human targets and possible targets in the environment, and the importance of the affected pathway for the target species. In line with this approach, this study investigated whether propranolol (PROP) affects the cAMP-dependent pathway in Mediterranean mussels, Mytilus galloprovincialis. PROP is a prototypical β-adrenoceptor antagonist, and these receptors exist in bivalves and show gross pharmacological properties similar to their mammalian counterparts. PROP also acts as a 5-HT1 receptor antagonist, which is the sole 5-HT receptor reported in bivalves to date. Importantly, β-adrenoceptor and 5HT-1 receptor subtypes are positively and negatively coupled to cAMP-mediated signaling, respectively. PROP was administered as either l-PROP or dl-PROP. A wide range of concentrations was tested including low (0.3, 3 and 30ng/L) and high (300ng/L) environmental ranges, and a concentration 5-fold above the maximum reported environmental level (30,000ng/L). After a 7-day exposure, mussel cAMP levels and PKA activities were significantly reduced in digestive gland, increased in mantle/gonads and unaffected in gills. Similar patterns were observed for the mRNA expression of the ABCB1 gene encoding the membrane transporter P-glycoprotein, hypothesised to be under PKA modulation. The effects on the digestive gland are consistent with PROP blocking β-adrenoceptors. The observed increased cAMP levels in the mantle/gonad tissue support PROP blocking 5-HT1 receptors. Catalase and glutathione-S tranferase were differently affected by PROP in the two tissues. Mussel haemocyte lysosome membrane stability, a sensitive biomarker of animal health status, was concentration-dependently reduced following PROP exposure. Our observations provide evidence for PROP affecting cell signaling in M. galloprovincialis. Moreover, the chemical interacts with specific and evolutionally conserved biochemical pathways for which it was designed. The mode of action of PROP in mussels is related with its therapeutic properties in humans, based upon these conserved human targets. It also induced a stress response, and all these effects were displayed at the lowest concentrations tested.
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Affiliation(s)
- Silvia Franzellitti
- University of Bologna, Interdepartment Centre for Research in Environmental Sciences (CIRSA), via S. Alberto 163, 48123 Ravenna, Italy
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Benstead RS, Baynes A, Casey D, Routledge EJ, Jobling S. 17β-Oestradiol may prolong reproduction in seasonally breeding freshwater gastropod molluscs. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2011; 101:326-334. [PMID: 21216342 DOI: 10.1016/j.aquatox.2010.11.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2010] [Revised: 11/01/2010] [Accepted: 11/10/2010] [Indexed: 05/30/2023]
Abstract
Whilst the effects of oestrogenic contaminants in the aquatic environment are well documented in fish, effects in invertebrate species has been subject to debate, possibly due to differences in experimental conditions (temperature, timing and duration of exposure) between studies. It has been suggested that molluscs are only susceptible to oestrogens in periods either following the main spawning or leading up to the maturation of gametes. To investigate this possibility, two temperate, seasonally reproducing gastropods (Planorbarius corneus and Viviparus viviparus) were exposed to two concentrations of 17β-oestradiol (E2; 10ng/l and 100ng/l nominal) in an outdoor mesocosm (subject to natural seasons). In addition, P. corneus was also exposed to E2 (1, 10 and 100ng/l) in the laboratory at temperatures and photoperiods to simulate summer and autumn. In the mesocosm, both snail species produced similar numbers of eggs/embryos as reference groups in the summer, but the groups exposed to 10ngE2/l (nominal) had significantly higher productivities after the onset of autumn, when entering their quiescent phase, whilst the snails exposed to a higher concentration (100ng/l, nominal) had an increased rate of mortality, and did not experience increased reproduction. In the laboratory, the rate of egg laying in P. corneus was unaffected in simulated summer (20°C, 16h photoperiod), but snails exposed to 10 and 100ng/l (nominal) in simulated autumn (15°C, 12h photoperiod) showed a concentration-dependent inhibition of the natural decline in egg laying observed in the control snails. Overall, rather than an increase in reproductive rate, the response of this species was a perpetuation of summer reproductive rates into autumn. We conclude that exposure to E2 can affect reproduction in the freshwater gastropods studied, but in P. corneus at least, this is dependent on the seasonal conditions (temperature and photoperiod) at which exposures are made.
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Affiliation(s)
- Rachel S Benstead
- Environment Agency, Red Kite House, Howbery Park, Wallingford, Oxon, UK.
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Gagné F, Bouchard B, André C, Farcy E, Fournier M. Evidence of feminization in wild Elliptio complanata mussels in the receiving waters downstream of a municipal effluent outfall. Comp Biochem Physiol C Toxicol Pharmacol 2011; 153:99-106. [PMID: 20868769 DOI: 10.1016/j.cbpc.2010.09.002] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/18/2010] [Revised: 09/15/2010] [Accepted: 09/17/2010] [Indexed: 10/19/2022]
Abstract
The endocrine-disrupting activity of municipal effluents has the potential to alter the reproductive system and induce feminization to aquatic organisms. The purpose of this study was to examine the sex ratio, vitellogenin (Vtg)-like proteins, serotonin, arachidonate cyclooxygenase (COX) activity and dopamine status in wild mussels living at sites upstream and downstream of two municipal effluent outfalls in the Mille-Îles River (Quebec, Canada). Gonad integrity was also studied by monitoring the gonado-somatic index (GSI), the activity of the rate-limiting enzyme aspartate transcarbamoylase (ATC) for purine synthesis, and changes in lipid peroxidation (LPO). The results showed that the proportion of females was dramatically increased from 30% at the upstream sites to 80% at the downstream sites. The levels of Vtg-like proteins were significantly elevated in the male mussels only. Male mussels downstream of the municipal effluent plumes expressed female-specific protein bands (Vtg-like), as determined by high-resolution gel electrophoresis and silver staining. The serotonin/dopamine ratio was significantly decreased in the downstream mussels, indicating that the gonad was in a state of early vitellogenesis. However, this change was not accompanied by changes in ATC, suggesting no significant egg production was underway; this was confirmed by the observation that the downstream mussels displayed significantly low GSIs. GSIs were rather dependent on the serotonin/dopamine ratio (r=0.44; p<0.001), while Vtg-like proteins were dependent on dopamine levels (r=0.50; p<0.001). The increase in COX activity at the downstream sites and its close relationship with increased serotonin levels suggest a concomitant serotonergic signalling in addition to VTG production. The production of Vtg-like proteins combined with the serotonergic effects of the municipal effluents was associated with oxidative damage (LPO) in the gonad. This study provides the first evidence of feminization in wild mussel populations and the disruption in gonad physiology by exposure to municipal effluents.
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Affiliation(s)
- F Gagné
- Environment Canada, Fluvial Ecosystem Research, 105 McGill, 7th Floor, Montreal, Quebec, Canada H2Y 2E7.
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39
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Ciocan CM, Cubero-Leon E, Puinean AM, Hill EM, Minier C, Osada M, Fenlon K, Rotchell JM. Effects of estrogen exposure in mussels, Mytilus edulis, at different stages of gametogenesis. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2010; 158:2977-2984. [PMID: 20615598 DOI: 10.1016/j.envpol.2010.05.025] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2010] [Revised: 05/24/2010] [Accepted: 05/30/2010] [Indexed: 05/29/2023]
Abstract
Mytilus edulis were exposed to 17beta-estradiol (E2) and the synthetic estrogens ethinyl estradiol (EE2) and estradiol benzoate (EB) for 10 days. Two exposures were performed to determine their effect on vitellogenin (VTG) and estrogen receptor 2 (ER2) mRNA expression at different stages of the reproductive cycle. Significant natural variation was not observed in VTG mRNA expression, though ER2 mRNA expression displayed significantly lower values during January, February and July compared with other times of the year. A significant increase in VTG and ER2 mRNA expression was observed in mussels exposed to estrogens at the early stage of gametogenesis. In contrast, mature mussels displayed no statistically significant change in the VTG or ER2 mRNA expression. The data presented suggests that the reproductive physiology of molluscs, in terms of VTG and ER2 mRNA expression, may be susceptible to damage by environmental estrogens at certain points in their gametogenesis process.
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Affiliation(s)
- Corina M Ciocan
- Department of Biology and Environmental Science, School of Life Sciences, University of Sussex, Falmer, Brighton BN1 9QJ, UK
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