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Morgan AN, Fogelson SB, Wills PS, Mincer T, Mejri S, Page A. Hematological changes in Florida pompano (Trachinotus carolinus) supplemented with β-glucan and Pediococcus acidilactici synbiotic. JOURNAL OF FISH BIOLOGY 2024; 104:1091-1111. [PMID: 38174614 DOI: 10.1111/jfb.15645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Revised: 12/06/2023] [Accepted: 12/08/2023] [Indexed: 01/05/2024]
Abstract
Florida pompano (Trachinotus carolinus) are a species of growing interest for commercial aquaculture. Effective health monitoring is crucial to the successful growout of the species, and prophylactic and therapeutic use of chemicals and antibiotics has been the traditional strategy for promoting stock health. However, concerns about antimicrobial resistance, chemical residues in seafood products and the environment, and resultant immunosuppression have prompted the industry to identify alternative management strategies, including supplementation with prebiotics, probiotics, and combinations of both (synbiotics). The objectives of this study are to determine and compare hematological, plasma biochemical, and plasma protein electrophoresis data of synbiotic-supplemented (β-glucan and Pediococcus acidilactici) and non-supplemented Florida pompano. Reference intervals for blood analytes are provided for both groups and for subgroups (females, males, large, and small fish) where statistically significant results exist. There are no differences between the hematological and plasma biochemistry analytes between the supplemented and control groups, except for blood urea nitrogen and carbon dioxide, indicating a possible effect of synbiotic supplementation on gill function and osmoregulation. Sex-related and size-related differences are observed within each of the control and supplemented groups; however, biometric measurements do not strongly correlate with blood analytes. These data represent baseline hematological and plasma biochemical data in the Florida pompano and indicate the safety of synbiotic supplementation in this commercially important species. This study serves to further the commercialization of Florida pompano by providing blood analyte reference intervals for health monitoring in the aquaculture setting.
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Affiliation(s)
- Ashley N Morgan
- Harbor Branch Oceanographic Institute, Florida Atlantic University, Fort Pierce, Florida, USA
| | | | - Paul S Wills
- Harbor Branch Oceanographic Institute, Florida Atlantic University, Fort Pierce, Florida, USA
| | - Tracy Mincer
- Harbor Branch Oceanographic Institute, Florida Atlantic University, Fort Pierce, Florida, USA
| | - Sahar Mejri
- Harbor Branch Oceanographic Institute, Florida Atlantic University, Fort Pierce, Florida, USA
| | - Annie Page
- Harbor Branch Oceanographic Institute, Florida Atlantic University, Fort Pierce, Florida, USA
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2
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Rozza AL, Beserra FP, Vieira AJ, Oliveira de Souza E, Hussni CA, Martinez ERM, Nóbrega RH, Pellizzon CH. The Use of Menthol in Skin Wound Healing-Anti-Inflammatory Potential, Antioxidant Defense System Stimulation and Increased Epithelialization. Pharmaceutics 2021; 13:pharmaceutics13111902. [PMID: 34834317 PMCID: PMC8620938 DOI: 10.3390/pharmaceutics13111902] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Revised: 11/02/2021] [Accepted: 11/03/2021] [Indexed: 12/17/2022] Open
Abstract
Wound healing involves inflammatory, proliferative, and remodeling phases, in which various cells and chemical intermediates are involved. This study aimed to investigate the skin wound healing potential of menthol, as well as the mechanisms involved in its effect, after 3, 7, or 14 days of treatment, according to the phases of wound healing. Skin wound was performed in the back of Wistar rats, which were topically treated with vehicle cream; collagenase-based cream (1.2 U/g); or menthol-based cream at 0.25%, 0.5%, or 1.0% over 3, 7, or 14 days. Menthol cream at 0.5% accelerated the healing right from the inflammatory phase (3 days) by decreasing mRNA expression of inflammatory cytokines TNF-α and Il-6. At the proliferative phase (7 days), menthol 0.5% increased the activity of antioxidant enzymes SOD, GR, and GPx, as well as the level of GSH, in addition to decreasing the levels of inflammatory cytokines TNF-α, IL-6, and IL-1β and augmenting mRNA expression for Ki-67, a marker of cellular proliferation. At the remodeling phase (14 days), levels of inflammatory cytokines were decreased, and the level of Il-10 and its mRNA expression were increased in the menthol 0.5% group. Menthol presented skin wound healing activity by modulating the antioxidant system of the cells and the inflammatory response, in addition to stimulating epithelialization.
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Affiliation(s)
- Ariane Leite Rozza
- Department of Structural and Functional Biology, Institute of Biosciences, São Paulo State University (UNESP), Dr. Antonio Celso W Zanin Street, 250, Botucatu 18618-689, Brazil; (F.P.B.); (A.J.V.); (E.O.d.S.); (E.R.M.M.); (R.H.N.); (C.H.P.)
- Correspondence:
| | - Fernando Pereira Beserra
- Department of Structural and Functional Biology, Institute of Biosciences, São Paulo State University (UNESP), Dr. Antonio Celso W Zanin Street, 250, Botucatu 18618-689, Brazil; (F.P.B.); (A.J.V.); (E.O.d.S.); (E.R.M.M.); (R.H.N.); (C.H.P.)
| | - Ana Júlia Vieira
- Department of Structural and Functional Biology, Institute of Biosciences, São Paulo State University (UNESP), Dr. Antonio Celso W Zanin Street, 250, Botucatu 18618-689, Brazil; (F.P.B.); (A.J.V.); (E.O.d.S.); (E.R.M.M.); (R.H.N.); (C.H.P.)
| | - Eduardo Oliveira de Souza
- Department of Structural and Functional Biology, Institute of Biosciences, São Paulo State University (UNESP), Dr. Antonio Celso W Zanin Street, 250, Botucatu 18618-689, Brazil; (F.P.B.); (A.J.V.); (E.O.d.S.); (E.R.M.M.); (R.H.N.); (C.H.P.)
| | - Carlos Alberto Hussni
- Department of Surgery and Veterinary Anesthesiology, School of Veterinary Medicine and Animal Science, São Paulo State University (UNESP), Dr. Walter M Correa Street, Botucatu 18618-689, Brazil;
| | - Emanuel Ricardo Monteiro Martinez
- Department of Structural and Functional Biology, Institute of Biosciences, São Paulo State University (UNESP), Dr. Antonio Celso W Zanin Street, 250, Botucatu 18618-689, Brazil; (F.P.B.); (A.J.V.); (E.O.d.S.); (E.R.M.M.); (R.H.N.); (C.H.P.)
| | - Rafael Henrique Nóbrega
- Department of Structural and Functional Biology, Institute of Biosciences, São Paulo State University (UNESP), Dr. Antonio Celso W Zanin Street, 250, Botucatu 18618-689, Brazil; (F.P.B.); (A.J.V.); (E.O.d.S.); (E.R.M.M.); (R.H.N.); (C.H.P.)
| | - Cláudia Helena Pellizzon
- Department of Structural and Functional Biology, Institute of Biosciences, São Paulo State University (UNESP), Dr. Antonio Celso W Zanin Street, 250, Botucatu 18618-689, Brazil; (F.P.B.); (A.J.V.); (E.O.d.S.); (E.R.M.M.); (R.H.N.); (C.H.P.)
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3
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Pinto PIS, Andrade AR, Moreira C, Zapater C, Thorne MAS, Santos S, Estêvão MD, Gomez A, Canario AVM, Power DM. Genistein and estradiol have common and specific impacts on the sea bass (Dicentrarchus labrax) skin-scale barrier. J Steroid Biochem Mol Biol 2019; 195:105448. [PMID: 31421232 DOI: 10.1016/j.jsbmb.2019.105448] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Revised: 08/05/2019] [Accepted: 08/13/2019] [Indexed: 10/26/2022]
Abstract
Teleost fish scales play important roles in animal protection and homeostasis. They can be targeted by endogenous estrogens and by environmental estrogenic endocrine disruptors. The phytoestrogen genistein is ubiquitous in the environment and in aquaculture feeds and is a disruptor of estrogenic processes in vertebrates. To test genistein disrupting actions in teleost fish we used a minimally invasive approach by analysing scales plucked from the skin of sea bass (Dicentrarchus labrax). Genistein transactivated all three fish nuclear estrogen receptors and was most potent with the Esr2, had the highest efficacy with Esr1, but reached, in all cases, transactivation levels lower than those of estradiol. RNA-seq revealed 254 responsive genes in the sea bass scales transcriptome with an FDR < 0.05 and more than 2-fold change in expression, 1 or 5 days after acute exposure to estradiol or to genistein. 65 genes were specifically responsive to estradiol and 106 by genistein while 83 genes were responsive to both compounds. Estradiol specifically regulated genes of protein/matrix turnover and genistein affected sterol biosynthesis and regeneration, while innate immune responses were affected by both compounds. This comprehensive study revealed the impact on the fish scale transcriptome of estradiol and genistein, providing a solid background to further develop fish scales as a practical screening tool for endocrine disrupting chemicals in teleosts.
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Affiliation(s)
- Patricia I S Pinto
- CCMAR - Centro de Ciencias do Mar (CCMAR), Universidade do Algarve, Campus de Gambelas, Edifício 7, 8005-139 Faro, Portugal.
| | - André R Andrade
- CCMAR - Centro de Ciencias do Mar (CCMAR), Universidade do Algarve, Campus de Gambelas, Edifício 7, 8005-139 Faro, Portugal.
| | - Catarina Moreira
- Normandy University, FR CNRS 3730 SCALE, UMR-I 02 INERIS-URCA-ULH Environmental Stress and Aquatic Biomonitoring (SEBIO), Université Le Havre Normandie, F-76600 Le Havre, France.
| | - Cinta Zapater
- IATS - Instituto de Acuicultura Torre la Sal, Ribera de Cabanes, 12595 Castellón, Spain.
| | - Michael A S Thorne
- British Antarctic Survey (BAS), High Cross, Madingley Road, Cambridge, CB3 0ET, UK.
| | - Soraia Santos
- CCMAR - Centro de Ciencias do Mar (CCMAR), Universidade do Algarve, Campus de Gambelas, Edifício 7, 8005-139 Faro, Portugal.
| | - M Dulce Estêvão
- CCMAR - Centro de Ciencias do Mar (CCMAR), Universidade do Algarve, Campus de Gambelas, Edifício 7, 8005-139 Faro, Portugal; Escola Superior de Saúde, Universidade do Algarve, Campus de Gambelas, Edifício 1, 8005-139 Faro, Portugal.
| | - Ana Gomez
- IATS - Instituto de Acuicultura Torre la Sal, Ribera de Cabanes, 12595 Castellón, Spain.
| | - Adelino V M Canario
- CCMAR - Centro de Ciencias do Mar (CCMAR), Universidade do Algarve, Campus de Gambelas, Edifício 7, 8005-139 Faro, Portugal.
| | - Deborah M Power
- CCMAR - Centro de Ciencias do Mar (CCMAR), Universidade do Algarve, Campus de Gambelas, Edifício 7, 8005-139 Faro, Portugal.
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Zapater C, Molés G, Muñoz I, Pinto PIS, Canario AVM, Gómez A. Differential involvement of the three nuclear estrogen receptors during oogenesis in European sea bass (Dicentrarchus labrax)†. Biol Reprod 2018; 100:757-772. [DOI: 10.1093/biolre/ioy227] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Revised: 08/06/2018] [Accepted: 10/25/2018] [Indexed: 11/13/2022] Open
Affiliation(s)
- Cinta Zapater
- Department of Fish Physiology and Biotechnology, Instituto de Acuicultura de Torre la Sal, Consejo Superior de Investigaciones Científicas (CSIC), Torre la Sal, Castellón, Spain
| | - Gregorio Molés
- Department of Fish Physiology and Biotechnology, Instituto de Acuicultura de Torre la Sal, Consejo Superior de Investigaciones Científicas (CSIC), Torre la Sal, Castellón, Spain
| | - Iciar Muñoz
- Department of Fish Physiology and Biotechnology, Instituto de Acuicultura de Torre la Sal, Consejo Superior de Investigaciones Científicas (CSIC), Torre la Sal, Castellón, Spain
| | - Patricia I S Pinto
- Centre of Marine Sciences (CCMAR), University of Algarve, Gambelas, Faro, Portugal
| | - Adelino V M Canario
- Centre of Marine Sciences (CCMAR), University of Algarve, Gambelas, Faro, Portugal
| | - Ana Gómez
- Department of Fish Physiology and Biotechnology, Instituto de Acuicultura de Torre la Sal, Consejo Superior de Investigaciones Científicas (CSIC), Torre la Sal, Castellón, Spain
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5
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Casanova-Nakayama A, Wernicke von Siebenthal E, Kropf C, Oldenberg E, Segner H. Immune-Specific Expression and Estrogenic Regulation of the Four Estrogen Receptor Isoforms in Female Rainbow Trout (Oncorhynchus mykiss). Int J Mol Sci 2018; 19:ijms19040932. [PMID: 29561790 PMCID: PMC5979597 DOI: 10.3390/ijms19040932] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Revised: 03/01/2018] [Accepted: 03/07/2018] [Indexed: 12/31/2022] Open
Abstract
Genomic actions of estrogens in vertebrates are exerted via two intracellular estrogen receptor (ER) subtypes, ERα and ERβ, which show cell- and tissue-specific expression profiles. Mammalian immune cells express ERs and are responsive to estrogens. More recently, evidence became available that ERs are also present in the immune organs and cells of teleost fish, suggesting that the immunomodulatory function of estrogens has been conserved throughout vertebrate evolution. For a better understanding of the sensitivity and the responsiveness of the fish immune system to estrogens, more insight is needed on the abundance of ERs in the fish immune system, the cellular ratios of the ER subtypes, and their autoregulation by estrogens. Consequently, the aims of the present study were (i) to determine the absolute mRNA copy numbers of the four ER isoforms in the immune organs and cells of rainbow trout, Oncorhynchus mykiss, and to compare them to the hepatic ER numbers; (ii) to analyse the ER mRNA isoform ratios in the immune system; and, (iii) finally, to examine the alterations of immune ER mRNA expression levels in sexually immature trout exposed to 17β-estradiol (E2), as well as the alterations of immune ER mRNA expression levels in sexually mature trout during the reproductive cycle. All four ER isoforms were present in immune organs—head kidney, spleen-and immune cells from head kidney and blood of rainbow trout, but their mRNA levels were substantially lower than in the liver. The ER isoform ratios were tissue- and cell-specific, both within the immune system, but also between the immune system and the liver. Short-term administration of E2 to juvenile female trout altered the ER mRNA levels in the liver, but the ERs of the immune organs and cells were not responsive. Changes of ER gene transcript numbers in immune organs and cells occurred during the reproductive cycle of mature female trout, but the changes in the immune ER profiles differed from those in the liver and gonads. The correlation between ER gene transcript numbers and serum E2 concentrations was only moderate to low. In conclusion, the low mRNA numbers of nuclear ER in the trout immune system, together with their limited estrogen-responsiveness, suggest that the known estrogen actions on trout immunity may be not primarily mediated through genomic actions, but may involve other mechanisms, such as non-genomic pathways or indirect effects.
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Affiliation(s)
- Ayako Casanova-Nakayama
- Centre for Fish and Wildlife Health, 3012 Bern, Switzerland.
- Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Länggassstrasse 122, 3012 Bern, Switzerland.
| | - Elena Wernicke von Siebenthal
- Centre for Fish and Wildlife Health, 3012 Bern, Switzerland.
- Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Länggassstrasse 122, 3012 Bern, Switzerland.
| | - Christian Kropf
- Centre for Fish and Wildlife Health, 3012 Bern, Switzerland.
- Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Länggassstrasse 122, 3012 Bern, Switzerland.
| | - Elisabeth Oldenberg
- Centre for Fish and Wildlife Health, 3012 Bern, Switzerland.
- Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Länggassstrasse 122, 3012 Bern, Switzerland.
| | - Helmut Segner
- Centre for Fish and Wildlife Health, 3012 Bern, Switzerland.
- Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Länggassstrasse 122, 3012 Bern, Switzerland.
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6
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Paiola M, Knigge T, Picchietti S, Duflot A, Guerra L, Pinto PIS, Scapigliati G, Monsinjon T. Oestrogen receptor distribution related to functional thymus anatomy of the European sea bass, Dicentrarchus labrax. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2017; 77:106-120. [PMID: 28756001 DOI: 10.1016/j.dci.2017.07.023] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Revised: 07/24/2017] [Accepted: 07/24/2017] [Indexed: 06/07/2023]
Abstract
In jawed vertebrates, the crosstalk between immune and endocrine system as well as many fundamental mechanisms of T cell development are evolutionary conserved. Oestrogens affect mammalian thymic function and plasticity, but the mechanisms of action and the oestrogen receptors involved remain unclear. To corroborate the oestrogenic regulation of thymic function in teleosts and to identify the implicated oestrogen receptor subtypes, we examined the distribution of nuclear and membrane oestrogen receptors within the thymus of the European Sea bass, Dicentrarchus labrax, in relation to its morpho-functional organisation. Immunohistological analysis specified thymus histology and organisation in teleosts and described, for the first time, Hassall's corpuscle like structures in the medulla of sea bass. All oestrogen receptors were expressed at the transcript and protein level, both in T cells and in stromal cells belonging to specific functional areas. These observations suggest complex regulatory actions of oestrogen on thymic function, notably through the stromal microenvironment, comprising both, genomic and non-genomic pathways that are likely to affect T cell maturation and trafficking processes. Comparison with birds, rodents and humans supports the thymic localization of oestrogen receptors and suggests that oestrogens modulate T cell maturation in all gnathostomes.
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Affiliation(s)
- Matthieu Paiola
- Normandy University, FR CNRS 3730 SCALE, UMR-I 02 SEBIO, Université Le Havre Normandie, F-76600 Le Havre, France
| | - Thomas Knigge
- Normandy University, FR CNRS 3730 SCALE, UMR-I 02 SEBIO, Université Le Havre Normandie, F-76600 Le Havre, France
| | - Simona Picchietti
- Department for Innovation in Biological, Agro-food and Forest Systems, Tuscia University, 01100 Viterbo, Italy
| | - Aurélie Duflot
- Normandy University, FR CNRS 3730 SCALE, UMR-I 02 SEBIO, Université Le Havre Normandie, F-76600 Le Havre, France
| | - Laura Guerra
- Department for Innovation in Biological, Agro-food and Forest Systems, Tuscia University, 01100 Viterbo, Italy
| | - Patricia I S Pinto
- Laboratory of Comparative Endocrinology and Integrative Biology, CCMAR - Centre of Marine Sciences, University of Algarve, 8005-139 Faro, Portugal
| | - Giuseppe Scapigliati
- Department for Innovation in Biological, Agro-food and Forest Systems, Tuscia University, 01100 Viterbo, Italy
| | - Tiphaine Monsinjon
- Normandy University, FR CNRS 3730 SCALE, UMR-I 02 SEBIO, Université Le Havre Normandie, F-76600 Le Havre, France.
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7
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Pinto PI, Thorne MA, Power DM. European sea bass ( Dicentrarchus labrax ) skin and scale transcriptomes. Mar Genomics 2017. [DOI: 10.1016/j.margen.2017.05.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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8
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Pinto PIS, Estêvão MD, Santos S, Andrade A, Power DM. In vitro screening for estrogenic endocrine disrupting compounds using Mozambique tilapia and sea bass scales. Comp Biochem Physiol C Toxicol Pharmacol 2017; 199:106-113. [PMID: 28602910 DOI: 10.1016/j.cbpc.2017.06.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Revised: 05/19/2017] [Accepted: 06/06/2017] [Indexed: 01/07/2023]
Abstract
A wide range of estrogenic endocrine disruptors (EDCs) are accumulating in the environment and may disrupt the physiology of aquatic organisms. The effects of EDCs on fish have mainly been assessed using reproductive endpoints and in vivo animal experiments. We used a simple non-invasive assay to evaluate the impact of estrogens and EDCs on sea bass (Dicentrarchus labrax) and tilapia (Oreochromis mossambicus) scales. These were exposed to estradiol (E2), two phytoestrogens and six anthropogenic estrogenic/anti-estrogenic EDCs and activities of enzymes related to mineralized tissue turnover (TRAP, tartrate-resistant acid phosphatase and ALP, alkaline phosphatase) were measured. Semi-quantitative RT-PCR detected the expression of both membrane and nuclear estrogen receptors in the scales of both species, confirming scales as a target for E2 and EDCs through different mechanisms. Changes in TRAP or ALP activities after 30minute and 24h exposure were detected in sea bass and tilapia scales treated with E2 and three EDCs, although compound-, time- and dose-specific responses were observed for the two species. These results support again that the mineralized tissue turnover of fish is regulated by estrogens and reveals that the scales are a mineralized estrogen-responsive tissue that may be affected by some EDCs. The significance of these effects for whole animal physiology needs to be further explored. The in vitro fish scale bioassay is a promising non-invasive screening tool for E2 and EDCs effects, although the low sensitivity of TRAP/ALP quantification limits their utility and indicates that alternative endpoints are required.
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Affiliation(s)
- Patrícia I S Pinto
- Centre of Marine Sciences (CCMAR), Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal.
| | - M Dulce Estêvão
- Centre of Marine Sciences (CCMAR), Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal; Escola Superior de Saúde, Universidade do Algarve, Av. Dr. Adelino da Palma Carlos, 8000-510 Faro, Portugal
| | - Soraia Santos
- Centre of Marine Sciences (CCMAR), Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
| | - André Andrade
- Centre of Marine Sciences (CCMAR), Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
| | - Deborah M Power
- Centre of Marine Sciences (CCMAR), Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal.
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9
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Chauvigné F, Parhi J, Ollé J, Cerdà J. Dual estrogenic regulation of the nuclear progestin receptor and spermatogonial renewal during gilthead seabream (Sparus aurata) spermatogenesis. Comp Biochem Physiol A Mol Integr Physiol 2017; 206:36-46. [DOI: 10.1016/j.cbpa.2017.01.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2016] [Revised: 01/10/2017] [Accepted: 01/13/2017] [Indexed: 12/11/2022]
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10
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Effects of estradiol-17β implantation on ovarian growth, sex steroid levels and vitellogenin proxies in previtellogenic sturgeon Huso huso. Anim Reprod Sci 2015; 157:1-10. [DOI: 10.1016/j.anireprosci.2014.12.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2014] [Revised: 11/23/2014] [Accepted: 12/03/2014] [Indexed: 12/21/2022]
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11
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Aerts J, Metz JR, Ampe B, Decostere A, Flik G, De Saeger S. Scales tell a story on the stress history of fish. PLoS One 2015; 10:e0123411. [PMID: 25922947 PMCID: PMC4414496 DOI: 10.1371/journal.pone.0123411] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2014] [Accepted: 02/27/2015] [Indexed: 01/08/2023] Open
Abstract
Fish faced with stressful stimuli launch an endocrine stress response through activation of the hypothalamic-pituitary-interrenal (HPI-) axis to release cortisol into the blood. Scientifically validated biomarkers to capture systemic cortisol exposure over longer periods of time are of utmost importance to assess chronic stress in governmental, wildlife, aquaculture and scientific settings. Here we demonstrate that cortisol in scales of common carp (Cyprinus carpio L.) is the long-sought biomarker for chronic stress. Undisturbed (CTR) and daily stressed (STRESS) carp were compared. Dexamethasone (DEX) or cortisol (CORT) fed fish served as negative and positive controls, respectively. Scale cortisol was quantified with a validated ultra-performance liquid chromatography tandem mass spectrometry method. An increase in scale cortisol content was found in STRESS and CORT but not in CTR and DEX fish. Scale cortisol content reflects its accumulation in a stressor and time dependent manner and validates the scale cortisol content as biomarker for chronic stress. Plasma analyses confirmed that (i) CTR, DEX and CORT treatments were effective, (ii) plasma cortisol of STRESS fish showed no signs of chronic HPI-axis activation, and (iii) plasma cortisol is a poor predictor for chronic stress. The expression of HPI key genes crf, pomc, and star were up-regulated in STRESS fish in the absence of a plasma cortisol response, as was the target gene of cortisol encoding subunit α1 of the Na+/K+-ATPase in gills. When lost, scales of fish regenerate fast. Regenerated scales corroborate our findings, offering (i) unsurpassed time resolution for cortisol incorporation and as such for stressful events, and (ii) the possibility to investigate stress in a well defined and controlled environment and time frame creating novel opportunities for bone physiological research. We conclude that the cortisol content in ontogenetic and regenerated scales is an innovative biomarker for chronic stress offering ample applications in science and industry.
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Affiliation(s)
- Johan Aerts
- Bio-analysis Research Group, Animal Sciences Unit, Institute for Agriculture and Fisheries Research, Melle, Belgium
- Laboratory of Food Analysis, Department of Bio-analysis, Faculty of Pharmaceutical Sciences, Ghent University, Ghent, Belgium
- * E-mail:
| | - Juriaan Rogier Metz
- Department of Animal Physiology, Institute for Water and Wetland Research, Faculty of Science, Radboud University Nijmegen, Nijmegen, The Netherlands
| | - Bart Ampe
- Biostatistics and Data modeling, Animal Sciences Unit, Institute for Agriculture and Fisheries Research, Melle, Belgium
| | - Annemie Decostere
- Department of Morphology, Faculty of Veterinary Medicine, Ghent University, Ghent, Belgium
| | - Gert Flik
- Department of Animal Physiology, Institute for Water and Wetland Research, Faculty of Science, Radboud University Nijmegen, Nijmegen, The Netherlands
| | - Sarah De Saeger
- Laboratory of Food Analysis, Department of Bio-analysis, Faculty of Pharmaceutical Sciences, Ghent University, Ghent, Belgium
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Krasnov A, Wesmajervi Breiland MS, Hatlen B, Afanasyev S, Skugor S. Sexual maturation and administration of 17β-estradiol and testosterone induce complex gene expression changes in skin and increase resistance of Atlantic salmon to ectoparasite salmon louse. Gen Comp Endocrinol 2015; 212:34-43. [PMID: 25599658 DOI: 10.1016/j.ygcen.2015.01.002] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/19/2014] [Revised: 12/25/2014] [Accepted: 01/10/2015] [Indexed: 12/29/2022]
Abstract
The crustacean ectoparasitic salmon louse (Lepeophtheirus salmonis) is a major problem of Atlantic salmon aquaculture in the Northern hemisphere. Host-pathogen interactions in this system are highly complex. Resistance to the parasite involves variations in genetic background, nutrition, properties of skin, and status of the endocrine and immune systems. This study addressed the relationship between sex hormones and lice infection. Field observation revealed a sharp reduction of lice prevalence during sexual maturation with no difference between male and female fish. To determine if higher resistance against lice was related to sex hormones, post-smolt salmon were administered control feed and feeds containing 17β-estradiol (20 mg/kg) and testosterone (25 mg/kg) during a 3-week pre-challenge period. After challenge with lice, counts were reduced 2-fold and 1.5-fold in fish that received 17β-estradiol and testosterone, respectively. Gene expression analyses were performed from skin of salmon collected in the field trial and from the controlled lab experiment at three time points (end of feeding-before challenge, 3 days post challenge (dpc) and 16 dpc) using oligonucleotide microarray and qPCR. Differential expression was observed in genes associated with diverse biological processes. Both studies revealed similar changes of several antibacterial acute phase proteins; of note was induction of cathelicidin and down-regulation of a defensin gene. Treatment with hormones revealed their ability to modulate T helper cell (Th)-mediated immunity in skin. Enhanced protection achieved by 17β-estradiol administration might in part be due to the skewing of Th responses away from the prototypic anti-parasitic Th2 immunity and towards the more effective Th1 responses. Multiple genes involved in wound healing, differentiation and remodelling of skin tissue were stimulated during maturation but suppressed with sex hormones. Such opposite regulation suggested that these processes were not associated with resistance to the parasite under the studied conditions. Both studies revealed regulation of a suite of genes encoding putative large mucosal proteins found exclusively in fish. Marked decrease of erythrocyte markers indicated reduced circulation while down-regulation of multiple zymogen granule membrane proteins and transporters of cholesterol and other compounds suggested limited availability of nutrients for the parasites.
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Affiliation(s)
| | | | | | - Sergey Afanasyev
- Nofima AS, PO Box 6122, NO-9291 Tromsø, Norway; Sechenov Institute of Evolutionary Physiology and Biochemistry, M. Toreza av. 44, Peterburg 194223, Russia.
| | - Stanko Skugor
- SLRC-Sea Lice Research Center, Faculty of Veterinary Medicine and Biosciences, Norwegian University of Life Sciences, Box 8146, NO-0033 Oslo, Norway.
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13
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Pinto PIS, Estêvão MD, Power DM. Effects of estrogens and estrogenic disrupting compounds on fish mineralized tissues. Mar Drugs 2014; 12:4474-94. [PMID: 25196834 PMCID: PMC4145326 DOI: 10.3390/md12084474] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Revised: 07/17/2014] [Accepted: 07/30/2014] [Indexed: 02/07/2023] Open
Abstract
Estrogens play well-recognized roles in reproduction across vertebrates, but also intervene in a wide range of other physiological processes, including mineral homeostasis. Classical actions are triggered when estrogens bind and activate intracellular estrogen receptors (ERs), regulating the transcription of responsive genes, but rapid non-genomic actions initiated by binding to plasma membrane receptors were recently described. A wide range of structurally diverse compounds from natural and anthropogenic sources have been shown to interact with and disrupt the normal functions of the estrogen system, and fish are particularly vulnerable to endocrine disruption, as these compounds are frequently discharged or run-off into waterways. The effect of estrogen disruptors in fish has mainly been assessed in relation to reproductive endpoints, and relatively little attention has been given to other disruptive actions. This review will overview the actions of estrogens in fish, including ER isoforms, their expression, structure and mechanisms of action. The estrogen functions will be considered in relation to mineral homeostasis and actions on mineralized tissues. The impact of estrogenic endocrine disrupting compounds on fish mineralized tissues will be reviewed, and the potential adverse outcomes of exposure to such compounds will be discussed. Current lacunae in knowledge are highlighted along with future research priorities.
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Affiliation(s)
- Patricia I S Pinto
- CCMAR-Centre of Marine Sciences, University of Algarve, Campus de Gambelas, Faro 8005-139, Portugal.
| | - Maria D Estêvão
- CCMAR-Centre of Marine Sciences, University of Algarve, Campus de Gambelas, Faro 8005-139, Portugal.
| | - Deborah M Power
- CCMAR-Centre of Marine Sciences, University of Algarve, Campus de Gambelas, Faro 8005-139, Portugal.
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14
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Ibarz A, Pinto PIS, Power DM. Proteomic approach to skin regeneration in a marine teleost: modulation by oestradiol-17β. MARINE BIOTECHNOLOGY (NEW YORK, N.Y.) 2013; 15:629-46. [PMID: 23728848 DOI: 10.1007/s10126-013-9513-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2013] [Accepted: 05/12/2013] [Indexed: 05/02/2023]
Abstract
Skin and scale formation and regeneration in teleosts have mainly been described from a morphological perspective, and few studies of the underlying molecular events exist. The present study evaluates (1) the change in the skin proteome during its regeneration in a marine teleost fish (gilthead sea bream, Sparus aurata) and (2) the impact of oestradiol-17β (Ε2) on regeneration and the involvement of oestrogen receptor (ER) isoforms. Thirty-five candidate proteins were differentially expressed (p < 0.05) between intact and regenerated skin proteome 5 days after scale removal, and 27 proteins were differentially expressed after E2 treatment. Agglomerative hierarchical clustering of the skin proteome revealed that the skin treated with E2 clustered most closely to intact skin, while regenerating untreated skin formed an independent cluster. Gene Ontology classification associated the differentially expressed proteins in E2-treated skin with developmental processes and cellular morphogenesis. The proteins modified during skin regeneration suggest a balance exists between immune response and anatomical repair. Overall, the results indicate that, even after 5 days regeneration, the composition of mature skin is not attained, and endocrine factors, in particular E2, can accelerate wound repair acting possibly via ERβs expressed in the skin-scales. Several candidate proteins probably involved in scale development, osteoglycin, lipocalin2 and lamin A and the transcription factors PHD and grainyhead were identified. Future studies of fish skin regeneration will be required to provide further insight into this multistage process, and the present study indicates it will be useful to explore immune adaptations of epithelia permanently exposed to an aqueous environment.
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Affiliation(s)
- Antoni Ibarz
- Dept Fisiologia i Immunologia (Biologia), University of Barcelone, Xarxa de Referència de Recerca i Desenvolupament en Aqüicultura de la Generalitat de Catalunya, Diagonal 643, 08028, Barcelona, Spain,
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15
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Vieira FA, Thorne MAS, Stueber K, Darias M, Reinhardt R, Clark MS, Gisbert E, Power DM. Comparative analysis of a teleost skeleton transcriptome provides insight into its regulation. Gen Comp Endocrinol 2013; 191:45-58. [PMID: 23770218 DOI: 10.1016/j.ygcen.2013.05.025] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/06/2013] [Revised: 05/24/2013] [Accepted: 05/29/2013] [Indexed: 12/16/2022]
Abstract
An articulated endoskeleton that is calcified is a unifying innovation of the vertebrates, however the molecular basis of the structural divergence between terrestrial and aquatic vertebrates, such as teleost fish, has not been determined. In the present study long-read next generation sequencing (NGS, Roche 454 platform) was used to characterize acellular perichondral bone (vertebrae) and chondroid bone (gill arch) in the gilthead sea bream (Sparus auratus). A total of 15.97 and 14.53Mb were produced, respectively from vertebrae and gill arch cDNA libraries and yielded 32,374 and 28,371 contigs (consensus sequences) respectively. 10,455 contigs from vertebrae and 10,625 contigs from gill arches were annotated with gene ontology terms. Comparative analysis of the global transcriptome revealed 4249 unique transcripts in vertebrae, 4201 unique transcripts in the gill arches and 3700 common transcripts. Several core gene networks were conserved between the gilthead sea bream and mammalian skeleton. Transcripts for putative endocrine factors were identified in acellular gilthead sea bream bone suggesting that in common with mammalian bone it can act as an endocrine tissue. The acellular bone of the vertebra, in contrast to current opinion based on histological analysis, was responsive to a short fast and significant (p<0.05) down-regulation of several transcripts identified by NGS, osteonectin, osteocalcin, cathepsin K and IGFI occurred. In gill arches fasting caused a significant (p<0.05) down-regulation of osteocalcin and up-regulation of MMP9.
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16
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Cunha ME, Ré P, Quental-Ferreira H, Gavaia PJ, Pousão-Ferreira P. Larval and juvenile development of dusky grouper Epinephelus marginatus reared in mesocosms. JOURNAL OF FISH BIOLOGY 2013; 83:448-465. [PMID: 23991867 DOI: 10.1111/jfb.12180] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2013] [Revised: 06/03/2013] [Accepted: 06/03/2013] [Indexed: 06/02/2023]
Abstract
The larval development of the dusky grouper Epinephelus marginatus up to the benthic juvenile stage is described in detail to establish a reference for their larval identification. Development is described in terms of ontogenetic changes in morphology, growth, pigmentation, fin structure and skeletal structure. Larvae were reared in mesocosms at a mean temperature of 24·3° C, salinity of 36·5, dissolved oxygen of 6·4 mg l(-1) and pH of 8·2. Newly hatched larvae had an estimated total length (LT ) of 2·3 mm. On the second day post hatching the yolk was almost fully absorbed with traces of the oil globule still present, the eyes were already pigmented and mouth and gut functional. At this stage the cranial skeletal elements for feeding and breathing (mouth and gills) and the pectoral-fin support were already present. About 50% of the observed larvae had food in their guts. Pigmentation was very characteristic, consisting of two large chromatophores visible on the edge of the primordial fin, close to the midpoint of the post-anal region of the body and over the midgut and hindgut and post-anal portion of the body. At 2·9 mm LT the emergence of the second dorsal-fin spine, characteristic of the Epinephilinae, was clearly visible. The pre-flexion stage started in larva of 3·2 mm LT . At 5·5 mm LT the larvae possessed posterior preopercular angle spines, and the dorsal and pelvic spines presented serrated edges and were pigmented. The water surface-tension-related death of the yolk sac and pre-flexion larvae described in the rearing of several other grouper species did not occur during E. marginatus culture. Notochord flexion, with initial ossification of the caudal-fin supporting elements, started at 6·6 mm LT . At this stage the major melanophores, preopercular, dorsal and pelvic spines and mandibular teeth were already present. Transformation of larvae into juveniles occurred when larvae averaged 13·8 mm LT . Juveniles with a mean LT of 20·1 mm started to settle and most of them were benthic with a mean LT of 26·8 mm.
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Affiliation(s)
- M E Cunha
- IPMA, Aquaculture Research Station, Av. 5 de Outubro s/n, 8700-305 Olhão, Portugal.
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Vieira FA, Pinto PI, Guerreiro PM, Power DM. Divergent responsiveness of the dentary and vertebral bone to a selective estrogen-receptor modulator (SERM) in the teleost Sparus auratus. Gen Comp Endocrinol 2012; 179:421-7. [PMID: 23036732 DOI: 10.1016/j.ygcen.2012.09.018] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/13/2012] [Revised: 09/12/2012] [Accepted: 09/13/2012] [Indexed: 01/21/2023]
Abstract
In teleosts the regulation of skeletal homeostasis and turnover by estrogen is poorly understood. For this reason raloxifene, a selective estrogen-receptor modulator (SERM), was administered to sea bream (Sparus auratus) and its effect on plasma calcium balance and transcript expression in dentary (dermal bone) and vertebra (perichondral bone) was studied. The concentration of total calcium or phosphorus in plasma was unchanged by raloxifene treatment for 6days. The activity of alkaline phosphatase (ALP) in dentary bone of raloxifene treated fish was significantly (p<0.05) higher than control fish but it was not changed in vertebral bone. Transcripts for estrogen receptor (ER) α were in very low abundance in the sea bream dentary and vertebra and were unchanged by raloxifene treatment. In contrast, raloxifene caused significant (p<0.05) up-regulation of the duplicate ERβ transcripts in the dentary but did not affect specific transcripts for osteoclast (TRAP), osteoblast (ALP, Runx2, osteonectin) or cartilage (IGF1, CILP2, FN1a). In the vertebra ERβb was not changed by raloxifene but ERβa was significantly (p<0.05) down-regulated as was the skeletal specific transcripts, TRAP, ALP, CILP2, FN1a. In summary, ERβs regulate estrogen sensitivity of the skeleton in sea bream, which responds in a non uniform manner. In common with mammals raloxifene appears to have an anti-resorptive role (in sea bream vertebra), but also an osteoblast stimulatory role, inducing ALP activity in the dentary of sea bream. Overall, the results indicate bone specific responsiveness to raloxifene in the sea bream. Further work will be required to understand the basis of bone responsiveness and the role of E(2) and ERs in teleost bone homeostasis.
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Affiliation(s)
- F A Vieira
- Comparative and Molecular Endocrinology Group, Centre for Marine Sciences (CCMAR), Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal.
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Chandra K, Bosker T, Hogan N, Lister A, MacLatchy D, Currie S. Sustained high temperature increases the vitellogenin response to 17α-ethynylestradiol in mummichog (Fundulus heteroclitus). AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2012; 118-119:130-140. [PMID: 22561700 DOI: 10.1016/j.aquatox.2012.04.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2011] [Revised: 04/04/2012] [Accepted: 04/04/2012] [Indexed: 05/31/2023]
Abstract
Mummichog (Fundulus heteroclitus), an estuarine fish of the western Atlantic, were acclimated to three salinities (0, 16 or 32 ppt) or three temperatures (10, 20 or 26 °C) and exposed to nominal 50 or 250 ng/L 17α-ethynylestradiol (EE2) for 14 days. In a separate experiment, fish were exposed to the same levels of EE2 and were subjected to a 1h heat shock (20-30 °C) on the 14th day and allowed to recover for 20 h. We were interested in whether or not susceptibility to EE2 exposure, as indicated by increases in vitellogenin (vtg) gene expression would change with high and low salinity, warm or cold temperature acclimation or acute heat shock. We also investigated the potential role of heat shock proteins (HSPs) under these conditions. Liver vtg1 mRNA was significantly induced in male mummichog exposed to 50 and 250 ng/L EE2, but salinity acclimation or acute heat shock did not further affect this induction. Males acclimated to 26 °C and exposed to 250 ng/L EE2 induced 3.5-fold more vtg1 mRNA than EE2 exposed males acclimated to 10 °C. HSP90 and HSP70 protein were largely unaffected by EE2 exposure. Our findings suggest that mummichog are more susceptible to EE2 under sustained temperature increases that may occur seasonally or with warming of coastal waters.
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Affiliation(s)
- Kavish Chandra
- Department of Biology, Mount Allison University, Sackville, NB E4L 1G7, Canada
| | - Thijs Bosker
- Department of Natural Resources and the Environment, Center for Environmental Sciences and Engineering, University of Connecticut, Storrs, CT, 06269-4087, USA
| | - Natacha Hogan
- Department of Animal and Poultry Science, University of Saskatchewan, Saskatoon, S7N 5A8, Canada
| | - Andrea Lister
- Department of Biology and Canadian Rivers Institute, Wilfrid Laurier University, Waterloo, ON N2L 3C5, Canada
| | - Deborah MacLatchy
- Department of Biology and Canadian Rivers Institute, Wilfrid Laurier University, Waterloo, ON N2L 3C5, Canada
| | - Suzanne Currie
- Department of Biology, Mount Allison University, Sackville, NB E4L 1G7, Canada.
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Vieira FA, Gregório SF, Ferraresso S, Thorne MAS, Costa R, Milan M, Bargelloni L, Clark MS, Canario AVM, Power DM. Skin healing and scale regeneration in fed and unfed sea bream, Sparus auratus. BMC Genomics 2011; 12:490. [PMID: 21981800 PMCID: PMC3199283 DOI: 10.1186/1471-2164-12-490] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2010] [Accepted: 10/07/2011] [Indexed: 02/01/2023] Open
Abstract
Background Fish scales are an important reservoir of calcium and phosphorus and together with the skin function as an integrated barrier against environmental changes and external aggressors. Histological studies have revealed that the skin and scales regenerate rapidly in fish when they are lost or damaged. In the present manuscript the histological and molecular changes underlying skin and scale regeneration in fed and fasted sea bream (Sparus auratus) were studied using a microarray 3 and 7 days after scale removal to provide a comprehensive molecular understanding of the early stages of these processes. Results Histological analysis of skin/scales revealed 3 days after scale removal re-epithelisation and formation of the scale pocket had occurred and 53 and 109 genes showed significant up or down-regulation, respectively. Genes significantly up-regulated were involved in cell cycle regulation, cell proliferation and adhesion, immune response and antioxidant activities. 7 days after scale removal a thin regenerated scale was visible and only minor changes in gene expression occurred. In animals that were fasted to deplete mineral availability the expression profiles centred on maintaining energy homeostasis. The utilisation of fasting as a treatment emphasised the competing whole animal physiological requirements with regard to barrier repair, infection control and energy homeostasis. Conclusions The identification of numerous genes involved in the mitotic checkpoint and cell proliferation indicate that the experimental procedure may be useful for understanding cell proliferation and control in vertebrates within the context of the whole animal physiology. In response to skin damage genes of immune surveillance were up-regulated along with others involved in tissue regeneration required to rapidly re-establish barrier function. Additionally, candidate fish genes were identified that may be involved in cytoskeletal re-modelling, mineralization and stem cells, which are of potential use in aquaculture and fish husbandry, as they may impact on the ability of the fish to produce structural proteins, such as muscle, efficiently.
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Affiliation(s)
- Florbela A Vieira
- Comparative and Molecular Endocrinology Group, Centre for Marine Sciences (CCMAR), Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal.
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Lynn SG, Wallat GK, Malison JA, Shepherd BS. Developmental expression and estrogen responses of endocrine genes in juvenile yellow perch (Perca flavescens). Gen Comp Endocrinol 2011; 171:151-9. [PMID: 21216244 DOI: 10.1016/j.ygcen.2011.01.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/17/2009] [Revised: 11/24/2010] [Accepted: 01/03/2011] [Indexed: 12/13/2022]
Abstract
The present study examines the expression of growth-regulating genes (gh, prl, smtl and igf1b), the estrogen receptors (esr1 and esr2a) and aromatase (cyp19a1a) in developing yellow perch. To gain an initial understanding into the endocrine control of growth preceding and involved with sexual size dimorphism (SSD), where females have been reported to grow faster and larger than males, young of the year fish were sampled for length, weight and tissues at several time points (102-421 days post-hatch (dph)). Positive growth was seen in both sexes over the sampling interval, but SSD was not manifested. Using real-time quantitative PCR, we found that pituitary growth hormone (gh) and liver insulin-like growth factor-1b (igf1b) mRNA levels were significantly affected by dph and levels were found to be correlated with growth in both sexes. Liver cyp19a1a, esr1 and esr2a mRNA levels were significantly influenced by dph, whereas there was a significant dph*sex interaction on liver esr2a mRNA levels with males having higher levels than females at 379 and 421 dph. Ovarian cyp19a1a decreased with dph, but there were no changes in esr1 or esr2a mRNA levels. Dietary treatment of juvenile (∼300 dph) females with 20 mg/kg diet 17β-estradiol resulted in significantly higher liver esr1 mRNA levels and a sustained hepatosomatic index (I(H)). Across all data sets liver esr2a mRNA levels showed the most significant positive correlation with liver igf1b mRNA levels. These findings show that growth is accompanied by increases in pituitary gh, liver igf1b and liver esr1 and esr2a mRNAs in juvenile yellow perch.
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Affiliation(s)
- Scott G Lynn
- Department of Biology, University of Kentucky, Lexington, KY 40506, USA.
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