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Gilmour KM, Turko AJ. Effects of structural remodelling on gill physiology. J Comp Physiol B 2024:10.1007/s00360-024-01558-0. [PMID: 38758304 DOI: 10.1007/s00360-024-01558-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Revised: 03/01/2024] [Accepted: 04/11/2024] [Indexed: 05/18/2024]
Abstract
The complex relationships between the structure and function of fish gills have been of interest to comparative physiologists for many years. Morphological plasticity of the gill provides a dynamic mechanism to reversibly alter its structure in response to changes in the conditions experienced by the fish. The best known example of gill remodelling is the growth or retraction of cell masses between the lamellae, a rapid process that alters the lamellar surface area that is exposed to the water (i.e. the functional lamellar surface area). Decreases in environmental O2 availability and/or increases in metabolic O2 demand stimulate uncovering of the lamellae, presumably to increase the capacity for O2 uptake. This review addresses four questions about gill remodelling: (1) what types of reversible morphological changes occur; (2) how do these changes affect physiological function from the gill to the whole animal; (3) what factors regulate reversible gill plasticity; and (4) is remodelling phylogenetically widespread among fishes? We address these questions by surveying the current state of knowledge of gill remodelling in fishes, with a focus on identifying gaps in our understanding that future research should consider.
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Affiliation(s)
- Kathleen M Gilmour
- Department of Biology, University of Ottawa, 30 Marie Curie Pvt, Ottawa, ON, K1N 6N5, Canada.
| | - Andy J Turko
- Department of Integrative Biology, University of Guelph, Guelph, ON, Canada
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Akter S, Mamun MAA, Hossain MS, Hossain A, Rahman MZ, Khalil SMI, Rahman MM, Alam MM. Ecotoxicological effects of cypermethrin on indigenous climbing perch (Anabas testudineus). Heliyon 2024; 10:e25723. [PMID: 38370174 PMCID: PMC10869875 DOI: 10.1016/j.heliyon.2024.e25723] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2023] [Revised: 01/26/2024] [Accepted: 02/01/2024] [Indexed: 02/20/2024] Open
Abstract
Pesticides including cypermethrin (10% EC) are commonly used pesticide in tea gardens of Bangladesh possess distinct harmful effects on an aquatic community. The experiment was carried out to assess the ecotoxicological effects of cypermethrin (10%) concentrate on indigenous Climbing Perch (Anabas testudineus). A total of 120 A. testudineus (mean length 16 ± 2.67 cm and mean weight 31.6 ± 3.56 g) were exposed to the acute toxicity test when the lethal concentration 50 value (LC50) for 96 h was maintained at 1.00 ppm. Three different sub-lethal concentrations of 0.05 ppm (5%), 0.10 ppm (10%), and 0.20 ppm (20%) were used respectively as three treatments and a control of 0 ppm with three replicates each. Restlessness, erratic movement, increased opercular activities, loss of equilibrium, and irregular response to feeding were observed in all the treatments compared to control one. Concerning histopathological alterations, all the analyzed organs showed highest changes in the T3 (cypermethrin conc. 20%) compared to other treatments while T0 (0 ppm) had normal structure. The major changes in the gill were epithelial cell hyperplasia, necrosis, severe lamellar fusion and epithelial lifting; while necrotic proximal tubules, glomerular shrinkage, disrupted renal corpuscle of the kidney and nuclear pyknosis, degenerated hepatic cells and vacuolation were observed in the liver. Severe melanomacrophage centre (MMC), haemosiderosis and vacuolation were found in spleen. The effect of cypermethrin on the hematological parameters of experimental fish was also studied. Red blood cells, hemoglobin and hematocrit were decreased in the experimental groups and lowest value was in T3 while values of white blood cells were increased in the experimental groups compared to control one. Hence, the present observation revealed that pesticides even at low concentrations can cause harmful effects on A. testudineus.
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Affiliation(s)
- Sharmin Akter
- Department of Fish Health Management, Sylhet Agricultural University, Sylhet-3100, Bangladesh
| | - Md. Abdullah-Al Mamun
- Department of Fish Health Management, Sylhet Agricultural University, Sylhet-3100, Bangladesh
| | - Md. Sabbir Hossain
- Department of Fish Health Management, Sylhet Agricultural University, Sylhet-3100, Bangladesh
| | - Arman Hossain
- Department of Fish Health Management, Sylhet Agricultural University, Sylhet-3100, Bangladesh
| | - Md. Zobayer Rahman
- Department of Fish Health Management, Sylhet Agricultural University, Sylhet-3100, Bangladesh
| | | | - Md. Moshiur Rahman
- Department of Fish Health Management, Sylhet Agricultural University, Sylhet-3100, Bangladesh
| | - M.M. Mahbub Alam
- Department of Fish Health Management, Sylhet Agricultural University, Sylhet-3100, Bangladesh
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Li Z, Chang T, Han F, Fan X, Liu W, Wu P, Xu C, Li E. Effects of myo-inositol on growth and biomarkers of environmental stress and metabolic regulation in Pacific white shrimp (Litopenaeus vannamei) reared at low salinity. Comp Biochem Physiol Part D Genomics Proteomics 2024; 50:101216. [PMID: 38364652 DOI: 10.1016/j.cbd.2024.101216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Revised: 02/08/2024] [Accepted: 02/08/2024] [Indexed: 02/18/2024]
Abstract
This study explored the role of myo-inositol in alleviating the low salinity stress of White Shrimp (Litopenaeus vannamei). Juvenile shrimp (0.4 ± 0.02 g) in low salinity (salinity 3) water were fed diets with myo-inositol levels of 0, 272, 518, 1020 and 1950 mg/kg (crude protein is 36.82 %, crude lipid is 7.58 %), fed shrimp in seawater at a salinity of 25 were fed a 0 mg/kg myo-inositol diet as a control (Ctrl). The experiment was carried out in tanks (50 L) with satiety feeding, and the experiment lasted for 6 weeks. After sampling, the serum was used to measure immune function, the hepatopancreas homogenate was used to measure the antioxidant capacity and hepatopancreas damage state, the hepatopancreas was used for transcriptomics analysis, and the gills were used for qPCR to measure osmotic pressure regulation. The results showed that the final weight and survival of the shrimp in the 1020 mg/kg group increased significantly compared with those in the other low salinity groups, but the final weight and biomass increase were significantly lower than those in the Ctrl group. Dietary myo-inositol improved the antioxidant capacity of shrimp under low salinity. B-cell hyperplasia and hepatic duct damage were observed in the hepatopancreas in the 0 mg/kg group. The results of transcriptome analysis showed that myo-inositol could participate in the osmotic pressure regulation of shrimp by regulating carbohydrate metabolism, amino acid metabolism, lipid metabolism and other related genes. Myo-inositol significantly affected the expression of related genes in ion transporter and G protein-coupled receptor-mediated pathways. This study demonstrated that myo-inositol can not only act as an osmotic pressure effector and participate in the osmolar regulation of shrimp through the phosphatidylinositol signaling pathway mediated by G protein-coupled receptors but also relieve low salinity stress by mediating physiological pathways such as immunity, antioxidation, and metabolism in shrimp. The binomial regression analysis of biomass increases and survival showed that the appropriate amount of myo-inositol in the L. vannamei diet was 862.50-1275.00 mg/kg under low salinity.
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Affiliation(s)
- Zhao Li
- Key Laboratory of Tropical Hydrobiology and Biotechnology of Hainan Province, Hainan Aquaculture Breeding Engineering Research Center, School of Marine Biology and Fisheries, Hainan University, Haikou 570228, China
| | - Tong Chang
- Key Laboratory of Tropical Hydrobiology and Biotechnology of Hainan Province, Hainan Aquaculture Breeding Engineering Research Center, School of Marine Biology and Fisheries, Hainan University, Haikou 570228, China
| | - Fenglu Han
- Key Laboratory of Tropical Hydrobiology and Biotechnology of Hainan Province, Hainan Aquaculture Breeding Engineering Research Center, School of Marine Biology and Fisheries, Hainan University, Haikou 570228, China.
| | - Xinlei Fan
- Key Laboratory of Tropical Hydrobiology and Biotechnology of Hainan Province, Hainan Aquaculture Breeding Engineering Research Center, School of Marine Biology and Fisheries, Hainan University, Haikou 570228, China
| | - Wei Liu
- Key Laboratory of Tropical Hydrobiology and Biotechnology of Hainan Province, Hainan Aquaculture Breeding Engineering Research Center, School of Marine Biology and Fisheries, Hainan University, Haikou 570228, China
| | - Ping Wu
- School of Basic Medicine and Biological Sciences, Key Laboratory of Aquatic Animal Nutrition, Jiangsu, Soochow University, Suzhou 215123, China
| | - Chang Xu
- Key Laboratory of Tropical Hydrobiology and Biotechnology of Hainan Province, Hainan Aquaculture Breeding Engineering Research Center, School of Marine Biology and Fisheries, Hainan University, Haikou 570228, China
| | - Erchao Li
- School of Life Sciences, East China Normal University, Shanghai 200241, China.
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Zhang Y, Zhang S, Xu S, Wang D. Effects of acute low-salinity stress on osmoregulation, antioxidant capacity, and growth of the black sea bream (Acanthopagrus schlegelii). Fish Physiol Biochem 2022; 48:1599-1617. [PMID: 36456863 DOI: 10.1007/s10695-022-01144-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Accepted: 11/15/2022] [Indexed: 06/17/2023]
Abstract
The black sea bream (Acanthopagrus schlegelii) is an important marine economic fish found on the southeast coast of China. Because of the frequent climate change, the salinity of the waters inhabited by A. schlegelii often decreases, which interferes with the fish's physiological homeostasis. The isotonic salinity of teleosts are usually lower than that of seawater, so maximum economic benefits cannot be obtained from conventional mariculture. This study was performed to preliminarily clarify the osmotic regulation and antioxidant mechanism of juvenile A. schlegelii and find an appropriate culture salinity value. We selected 5 psu, 10 psu, 15 psu, and 25 psu (control) to conduct physiological experiments for 96 h and growth experiments for 60 days. We found that the juvenile A. schlegelii could adjust their osmotic pressure within 12 h. The growth hormone and cortisol were found to be seawater-acclimating hormones, whereas prolactin was freshwater-acclimating hormone. The activity and mRNA expression of Na+/K+-ATPase showed a U-shaped trend with the decrease of in salinity at 12-96 h. Serum ion concentration and osmotic pressure remained at a relatively stable level after being actively adjusted from 6 to 12 h. At 96 h, the osmotic pressure of the serum isotonic point of juvenile A. schlegelii was approximately equal to that of water with 14.94 salinity. The number and volume of Cl--secreting cells in the gills decreased. The glomeruli were more developed and structurally sound, with the renal tubules increasing in diameter and the medial brush border being more developed; this may indicate a decrease in salt secretion and an enhanced reabsorption function in the low salinity groups. The activities of superoxide dismutase and catalase and concentration of malondialdehyde were the lowest in the 15 psu group. In addition, the culture conditions of the 15 psu group improved the feed conversion rate without significant differences in weight gain when compared with the control group. Our results show that 15 psu salinity may be the best parameter for obtaining the maximum economic benefits.
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Affiliation(s)
- Yibo Zhang
- School of Marine Science, Ningbo University, Zhejiang, Ningbo, China
| | - Shun Zhang
- School of Marine Science, Ningbo University, Zhejiang, Ningbo, China
| | - Shanliang Xu
- School of Marine Science, Ningbo University, Zhejiang, Ningbo, China.
- Key Laboratory of Applied Marine Biotechnology, Ningbo University, Chinese Ministry of Education, Ningbo, China.
| | - Danli Wang
- School of Marine Science, Ningbo University, Zhejiang, Ningbo, China.
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Sachi ITDC, Bonomo MM, Sakuragui MM, Modena PZ, Paulino MG, Carlos RM, Fernandes JB, Fernandes MN. Biochemical and morphological biomarker responses in the gills of a Neotropical fish exposed to a new flavonoid metal-insecticide. Ecotoxicol Environ Saf 2021; 208:111459. [PMID: 33069948 DOI: 10.1016/j.ecoenv.2020.111459] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Revised: 09/30/2020] [Accepted: 10/02/2020] [Indexed: 06/11/2023]
Abstract
The flavonoid metal-insecticide [Mg(hesp)2(phen)], denominated MgHP, has high potential for controlling agricultural pests. If applied in large scale, it may reach aquatic ecosystems and be harmful to the biota. This study evaluated the effects of MgHP in the gills of the Neotropical fish, Prochilodus lineatus by determining the activity of superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx) and glutathione s-transferase (GST), and the levels of glutathione (GSH) and lipid peroxidation (LPO) after 24 and 96 h exposure to 0, 1, 10, 100 and 1000 μg L-1. The histopathological changes with emphases to mitochondria-rich cells (MRC) were evaluated as well. After 24 h exposure the enzyme activities and the GSH and LPO levels were unchanged however, after 96 h exposure to high MgHP concentration (1000 μg L-1), the GST activity and GSH levels increased. Oxidative stress measured as LPO levels did not occur after MgHP exposure in both periods. Gill tissue alterations increased after MgHP exposure to 10, 100 and 1000 μg L-1. Cellular atrophy, pillar cells changes, filament epithelium hyperplasia and hypertrophy, lamellar epithelium hyperplasia were the most frequent histopathology. MRC in the filament epithelium decreased after exposure to 24 h and increased after 96 h indicating possible transitory osmo-ionic disruption. P. lineatus exhibited high tolerance to MgHP. The increased GST activity and GSH levels after 96 h exposure suggested possible MgHP accumulation and concentration- and time-dependent response. Histopathology in the gills of exposed fish occurred at high MgHP concentrations. These results suggested that the MgHP into water, at high concentrations, affect the gills by changing GST activity, GSH levels and histology being useful biomarkers for MgHP water contamination.
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Affiliation(s)
- Ivelise Teresa de Castro Sachi
- Postgraduate Program in Ecology and Natural Resources, Federal University of São Carlos, Rodovia Washington Luiz, Km 235, 13563-905 São Carlos, SP, Brazil; Department of Physiological Sciences, Federal University of São Carlos, Rodovia Washington, Luiz Km 235, 13563-905 São Carlos, SP, Brazil
| | - Marina Marques Bonomo
- Postgraduate Program in Ecology and Natural Resources, Federal University of São Carlos, Rodovia Washington Luiz, Km 235, 13563-905 São Carlos, SP, Brazil; Department of Physiological Sciences, Federal University of São Carlos, Rodovia Washington, Luiz Km 235, 13563-905 São Carlos, SP, Brazil
| | - Marise Margareth Sakuragui
- Postgraduate Program in Ecology and Natural Resources, Federal University of São Carlos, Rodovia Washington Luiz, Km 235, 13563-905 São Carlos, SP, Brazil; Department of Physiological Sciences, Federal University of São Carlos, Rodovia Washington, Luiz Km 235, 13563-905 São Carlos, SP, Brazil
| | - Pamela Zaganin Modena
- Department of Physiological Sciences, Federal University of São Carlos, Rodovia Washington, Luiz Km 235, 13563-905 São Carlos, SP, Brazil
| | - Marcelo Gustavo Paulino
- Federal University of Tocantins, Campus Araguaína, Avenida Paraguai, s/n°, Setor Cimba, 77824-838 Araguaína, TO, Brazil
| | - Rose Maria Carlos
- Chemistry Department, Federal University of São Carlos, Rodovia Washington Luiz, Km 235, 13565-905 São Carlos, SP, Brazil
| | - João Batista Fernandes
- Chemistry Department, Federal University of São Carlos, Rodovia Washington Luiz, Km 235, 13565-905 São Carlos, SP, Brazil
| | - Marisa Narciso Fernandes
- Postgraduate Program in Ecology and Natural Resources, Federal University of São Carlos, Rodovia Washington Luiz, Km 235, 13563-905 São Carlos, SP, Brazil; Department of Physiological Sciences, Federal University of São Carlos, Rodovia Washington, Luiz Km 235, 13563-905 São Carlos, SP, Brazil.
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Améndola-Pimenta M, Cerqueda-García D, Zamora-Briseño JA, Couoh-Puga D, Montero-Muñoz J, Árcega-Cabrera F, Ceja-Moreno V, Pérez-Vega JA, García-Maldonado JQ, Del Río-García M, Zapata-Pérez O, Rodríguez-Canul R. Toxicity evaluation and microbiota response of the lined sole Achirus lineatus (Chordata: Achiridae) exposed to the light petroleum water-accommodated fraction (WAF). J Toxicol Environ Health A 2020; 83:313-329. [PMID: 32378477 DOI: 10.1080/15287394.2020.1758861] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Revised: 04/17/2020] [Accepted: 04/17/2020] [Indexed: 06/11/2023]
Abstract
Exposure to contaminants might directly affect organisms and alter their associated microbiota. The objective of the present study was to determine the impact of the petroleum-water-accommodated fraction (WAF) from a light crude oil (API gravity 35) on a benthic fish species native from the Gulf of Mexico (GoM). Ten adults of Achirus lineatus (Linnaeus, 1758) were exposed to a sublethal WAF/water solution of 50% v/v for 48 hr. Multiple endpoints were measured including tissue damage, presence of polycyclic aromatic hydrocarbons (PAHs) metabolites in bile and gut microbiota analyses. Atrophy and fatty degeneration were observed in livers. Nodules and inflammation were detected in spleen, and structural disintegration and atrophy in the kidney. In gills hyperplasia, aneurysm, and gills lamellar fusion were observed. PAHs metabolites concentrations in bile were significantly higher in exposed organisms. Gut microbiome taxonomic analysis showed significant shifts in bacterial structure and composition following WAF exposure. Data indicate that exposure to WAF produced toxic effects in adults of A. lineatus, as evidenced by histological alterations and dysbiosis, which might represent an impairment to long-term subsistence of exposed aquatic organisms.
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Affiliation(s)
- Mónica Améndola-Pimenta
- Centro de Investigación y de Estudios Avanzados del IPN (CINVESTAV-IPN), Unidad Mérida , Yucatán, México
| | - Daniel Cerqueda-García
- Centro de Investigación y de Estudios Avanzados del IPN (CINVESTAV-IPN), Unidad Mérida , Yucatán, México
| | - Jesús A Zamora-Briseño
- Centro de Investigación y de Estudios Avanzados del IPN (CINVESTAV-IPN), Unidad Mérida , Yucatán, México
| | - Danilú Couoh-Puga
- Centro de Investigación y de Estudios Avanzados del IPN (CINVESTAV-IPN), Unidad Mérida , Yucatán, México
| | - Jorge Montero-Muñoz
- Centro de Investigación y de Estudios Avanzados del IPN (CINVESTAV-IPN), Unidad Mérida , Yucatán, México
| | - Flor Árcega-Cabrera
- Unidad de Química Sisal, Facultad de Química, Universidad Nacional Autónoma de México , Sisal Yucatán, México
| | - Víctor Ceja-Moreno
- Centro de Investigación y de Estudios Avanzados del IPN (CINVESTAV-IPN), Unidad Mérida , Yucatán, México
| | - Juan A Pérez-Vega
- Centro de Investigación y de Estudios Avanzados del IPN (CINVESTAV-IPN), Unidad Mérida , Yucatán, México
| | - José Q García-Maldonado
- CONACYT - Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Unidad Mérida , Mérida, México
| | - Marcela Del Río-García
- Centro de Investigación y de Estudios Avanzados del IPN (CINVESTAV-IPN), Unidad Mérida , Yucatán, México
| | - Omar Zapata-Pérez
- Centro de Investigación y de Estudios Avanzados del IPN (CINVESTAV-IPN), Unidad Mérida , Yucatán, México
| | - Rossanna Rodríguez-Canul
- Centro de Investigación y de Estudios Avanzados del IPN (CINVESTAV-IPN), Unidad Mérida , Yucatán, México
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Delunardo FAC, Paulino MG, Medeiros LCC, Fernandes MN, Scherer R, Chippari-Gomes AR. Morphological and histopathological changes in seahorse (Hippocampus reidi) gills after exposure to the water-accommodated fraction of diesel oil. Mar Pollut Bull 2020; 150:110769. [PMID: 31785847 DOI: 10.1016/j.marpolbul.2019.110769] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Revised: 09/28/2019] [Accepted: 11/21/2019] [Indexed: 06/10/2023]
Abstract
Industrial activities and urbanization are the main sources of pollutants in estuarine environments. Diesel, which is widely used in urban and port activities, is an important source of hydrocarbons in the aquatic environment, and its water-accommodated fraction (WAF) is toxic to the local biota. This study was performed to analyze the effects of diesel oil WAF on fish. Specifically, we characterized the gill morphology of the seahorse Hippocampus reidi and analyzed the histopathological changes in the gills after exposure to 50% diesel oil WAF. Acute (12, 24, 48, and 96 h) and subchronic (168 and 336 h) toxicity tests were performed. Furthermore, a recovery protocol was conducted: after exposure to 50% WAF for 168 h, the fish were transferred and kept in seawater without contaminants for 336 h, for a total experimental period of 504 h. The seahorse branchial apparatus was found to be tufted with short filaments; the apical surfaces of the pavement cells in the filament and lamellar epithelia formed "crests" and had microridges. Mitochondria-rich cells were distributed exclusively in the lamellar epithelium, while mucous cells were distributed in the filament epithelium. All pathologies observed after acute and subchronic exposure featured progressive time-dependent alterations of lamellar structure that might disrupt gill physiological and metabolic functions. During the recovery period, the gill alterations were gradually repaired.
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Affiliation(s)
- Frederico Augusto Cariello Delunardo
- Universidade Vila Velha (UVV), Laboratório de Ictiologia Aplicada (LAB PEIXE), Avenida Comissário José Dantas de Melo n(o) 21, Boa Vista, 29102-770 Vila Velha, ES, Brazil.
| | - Marcelo Gustavo Paulino
- Universidade Federal do Tocantins (UFT), Campus Araguaína, Avenida Paraguai, s/n°, 77824-838 Araguaína, TO, Brazil; Universidade Federal de São Carlos (UFSCar), Departamento de Ciências Fisiológicas, São Carlos, SP, Brazil
| | - Laila Carine Campos Medeiros
- Universidade Vila Velha (UVV), Laboratório de Ictiologia Aplicada (LAB PEIXE), Avenida Comissário José Dantas de Melo n(o) 21, Boa Vista, 29102-770 Vila Velha, ES, Brazil
| | - Marisa Narciso Fernandes
- Universidade Federal de São Carlos (UFSCar), Departamento de Ciências Fisiológicas, São Carlos, SP, Brazil
| | - Rodrigo Scherer
- UVV, Pós Graduação em Ciências Farmacêuticas, Avenida Comissário José Dantas de Melo n(o) 21, Boa Vista, 29102-770 Vila Velha, ES, Brazil
| | - Adriana Regina Chippari-Gomes
- Universidade Vila Velha (UVV), Laboratório de Ictiologia Aplicada (LAB PEIXE), Avenida Comissário José Dantas de Melo n(o) 21, Boa Vista, 29102-770 Vila Velha, ES, Brazil
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Sakuragui MM, Paulino MG, da Silva E Souza NE, Tavares D, Terezan AP, Pesenti E, Giani A, Fernandes JB, Cestari MM, Fernandes MN. Crude extract of cyanobacterium Radiocystis fernandoi strain R28 induces anemia and oxidative stress in fish erythrocytes. Toxicon 2019; 169:18-24. [PMID: 31421159 DOI: 10.1016/j.toxicon.2019.08.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Revised: 08/12/2019] [Accepted: 08/13/2019] [Indexed: 10/26/2022]
Abstract
The cyanobacterium Radiocystis fernandoi has been frequently identified in cyanobacterial blooms in Brazil. Recently, R. fernandoi strain R28, which produces microcystin (MC)-RR and MC-YR, was isolated from the Furnas reservoir, Minas Gerais, Brazil. The present study evaluated the hematological variables and erythrocyte antioxidant responses, lipid peroxidation (LPO), and genotoxicity in a neotropical fish (Hoplias malabaricus) after acute and subchronic exposure to a crude extract (CE) of R. fernandoi strain R28. Acute exposure (12 or 96 h) consisted of a single intraperitoneal (i.p.) CE injection, and subchronic exposure consisted of one i.p. CE injection every 72 h for 30 days. After acute exposure, fish exhibited macrocytic anemia (12 h post-injection) followed by normocytic anemia (96 h post-injection). The increased activity of superoxide dismutase, glutathione peroxidase, glutathione-S-transferase, and the glutathione level in the erythrocytes did not prevent oxidative stress, manifested as lipid peroxidation and elevated DNA damage after acute exposure. After subchronic exposure, the hematological variables recovered, and the absence of erythrocyte oxidative stress suggests possible modulation by other biological factors, including a possible decrease in MC uptake by the cells and/or increasing detoxification efficiency that precludes erythrocyte damage.
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Affiliation(s)
- Marise Margareth Sakuragui
- Departamento de Ciências Fisiológicas, Universidade Federal de São Carlos, Rodovia Washington Luiz Km 235, 13565-905, São Carlos, São Paulo, Brazil
| | - Marcelo Gustavo Paulino
- Departamento de Ciências Fisiológicas, Universidade Federal de São Carlos, Rodovia Washington Luiz Km 235, 13565-905, São Carlos, São Paulo, Brazil
| | - Naiara Elisabete da Silva E Souza
- Departamento de Ciências Fisiológicas, Universidade Federal de São Carlos, Rodovia Washington Luiz Km 235, 13565-905, São Carlos, São Paulo, Brazil
| | - Driele Tavares
- Departamento de Ciências Fisiológicas, Universidade Federal de São Carlos, Rodovia Washington Luiz Km 235, 13565-905, São Carlos, São Paulo, Brazil
| | - Ana Paula Terezan
- Departamento de Química, Universidade Federal de São Carlos, Rodovia Washington Luiz Km 235, 13565-905, São Carlos, São Paulo, Brazil
| | - Emanuele Pesenti
- Departamento de Genética, Universidade Federal do Paraná, P.O Box 19071, 81531-990, Curitiba, Paraná, Brazil
| | - Alessandra Giani
- Departamento de Botânica, Universidade Federal de Minas Gerais, Av. Pres. Antônio Carlos, 6627, 31270-901, Belo Horizonte, Minas Gerais, Brazil
| | - João Batista Fernandes
- Departamento de Química, Universidade Federal de São Carlos, Rodovia Washington Luiz Km 235, 13565-905, São Carlos, São Paulo, Brazil
| | - Marta Margarete Cestari
- Departamento de Genética, Universidade Federal do Paraná, P.O Box 19071, 81531-990, Curitiba, Paraná, Brazil
| | - Marisa Narciso Fernandes
- Departamento de Ciências Fisiológicas, Universidade Federal de São Carlos, Rodovia Washington Luiz Km 235, 13565-905, São Carlos, São Paulo, Brazil.
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Aguilar L, Leite RN, Ferreira CA, da Cruz AL. The integument of the nonamphibious goby Gobionellus oceanicus: Its functional morphology and respiratory capacity. J Morphol 2018; 279:1548-1558. [PMID: 30407645 DOI: 10.1002/jmor.20848] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2017] [Revised: 05/09/2018] [Accepted: 05/18/2018] [Indexed: 11/09/2022]
Abstract
Facultative air-breathing fish can exchange respiratory gases using an air-breathing organ (ABO), such as the oral cavity of the integument, during environmental hypoxia. The goby Gobionellus oceanicus inhabits areas subject to environmental hypoxia; however, its ABO is unknown. To investigate the respiratory potential of G. oceanicus, the gill and integument surface area, diffusion capacity, and their diffusion barrier thickness were measured. Our results show that although gill surface area is smaller than observed in other facultative air-breathing fish, but it has all features necessary to perform aquatic gas exchange. Additionally the integument of the palate has a short diffusion barrier thickness and a large calculated O2 -diffusion capacity suggesting that it functions as the ABO.
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Affiliation(s)
- Letícia Aguilar
- Laboratory of Animal Physiology, Federal University of Bahia, Institute of Biology, Salvador, Bahia, Brazil
| | - Rebeca Nuno Leite
- Laboratory of Animal Physiology, Federal University of Bahia, Institute of Biology, Salvador, Bahia, Brazil
| | | | - André Luis da Cruz
- Laboratory of Animal Physiology, Federal University of Bahia, Institute of Biology, Salvador, Bahia, Brazil
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Carmo TLL, Azevedo VC, Siqueira PR, Galvão TD, Santos FA, Martinez CBR, Appoloni CR, Fernandes MN. Mitochondria-rich cells adjustments and ionic balance in the Neotropical fish Prochilodus lineatus exposed to titanium dioxide nanoparticles. Aquat Toxicol 2018; 200:168-177. [PMID: 29772474 DOI: 10.1016/j.aquatox.2018.05.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2017] [Revised: 05/03/2018] [Accepted: 05/08/2018] [Indexed: 06/08/2023]
Abstract
Manufactured titanium dioxide nanoparticles (TiO2-NP) have been intensely applied in numerous industrial products and may be a risk for aquatic systems as they are not completely removed from domestic and industrial wastes after water treatment. This study evaluated the osmo- and ionic balance, Na+/K+-ATPase, H+-ATPase and carbonic anhydrase activities and the mitochondria-rich cells (MRC) in the gills and kidney of the Neotropical fish Prochilodus lineatus after 2 (acute) and 14 (subchronic) days of exposure to nominal 0, 1, 5, 10 and 50 mg L-1 TiO2-NP. The nominal concentrations corresponded to 0.0, 0.6, 1.6, 2.7 and 18.1 mg L-1 suspended TiO2-NP, respectively, in the water column one hour after NP introduction and were maintained for at least 24 h. Acute exposure to TiO2-NP decreased plasma osmolality and Ca2+ levels. Na+/K+-ATPase, H+-ATPase and carbonic anhydrase activities were inhibited in the gills, but not in the kidney. Total MRC density did not change in gills and kidneys. At gill surface, total MRC density decreased in fish exposed to 50 mg L-1 TiO2-NP and the total MRC fractional surface area unchanged although, there were some changes in the fractional area of MRC with apical microvilli (MRCm) and MRC with apical sponge-like structure (MRCs). MRCm was more abundant than MRCs. After subchronic exposure, there was no change in plasma osmolality, ionic balance and enzyme activities. Total gill MRC density increased in the filament epithelium and renal tubules. In the gills, MRC contacting water exhibited some adjustments. Total MRC and fractional surface area unchanged, but there was an increase of MRCs contacting water at gill surface after exposure to10 and 50 mg L-1 TiO2-NP. MRC proliferation in filament epithelium and in renal tubules as well as the increasing MRCs at gill surface may have contributed to avoid change in plasma osmolality, ionic balance and enzyme activities and suggested a cellular physiological and morphological response to restore and maintain osmotic and ionic homeostasis after subchronic exposure.
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Affiliation(s)
- Talita L L Carmo
- Physiological Sciences Department, Federal University of São Carlos, São Carlos, SP, 13565-905, Brazil
| | - Vinícius C Azevedo
- Physiological Sciences Department, Federal University of São Carlos, São Carlos, SP, 13565-905, Brazil
| | - Priscila R Siqueira
- Physiological Sciences Department, Federal University of São Carlos, São Carlos, SP, 13565-905, Brazil
| | - Tiago D Galvão
- Physics Department, State University of Londrina, Londrina, PR, 86055-900, Brazil
| | - Fabrício A Santos
- Physics Institute of São Carlos, University of São Paulo, São Carlos, SP, 13566-970, Brazil
| | - Cláudia B R Martinez
- Physiological Sciences Department, State University of Londrina, Londrina, PR, 86055-990, Brazil
| | - Carlos R Appoloni
- Physics Department, State University of Londrina, Londrina, PR, 86055-900, Brazil
| | - Marisa N Fernandes
- Physiological Sciences Department, Federal University of São Carlos, São Carlos, SP, 13565-905, Brazil.
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Andrade-Porto SM, Ramos CA, Roque R, Affonso EG, Barcellos JF, Queiroz MN, Araújo CS, Tavares-Dias M. Histopathological evaluation of formalin toxicity in Arapaima gigas (Arapaimidae), the giant fish from Amazon. Pesq Vet Bras 2018. [DOI: 10.1590/1678-5150-pvb-5106] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
ABSTRACT: This study aimed to determine the lethal concentration and the structural and ultra-structural effects caused by the formalin exposure on juveniles of Arapaima gigas. Ninety fish (60.1± 2.5g and 20.2±0.9cm) were exposed to 0, 22, 44, 66, 88 and 110mg L-1 in order to determine the lethal concentration (LC50-96h) that was 36.4mg L-1 of formalin. Sublethal effects were evaluated using histopathological analysis on the gills and assessment of behavioral alterations and clinical signs. The LC50 of formalin for 24, 48 and 72h was 88.3, 64.7 and 56.8mg L-1 respectively. Clinical signs and behavioral changes were found: erratic swimming, lethargy, crowding on the water surface, loss of hydrodynamic equilibrium, spasms and agonistic confrontation, which were observed only at 88 and 110mg L-1. The histological alteration index (HAI) showed that 66, 88 and 100mg L-1 presented significant difference (p<0.05) in relation to unexposed fish, indicating that moderate damage to the gills of fish exposed to formalin had occurred. The mean values of alteration (MVA) for 22, 44, 66, 88 and 110mg L-1 were 1.14, 1.29, 1.51, 1.53 and 1.60 respectively, and differences in this index were only observed with 110 mgL-1 of formalin. It is therefore possible to conclude that sublethal concentrations of formalin (22.0mg L-1) did not compromise the health of juveniles of A. gigas. Finally, concentrations greater than to LC50-96h may be carefully used for short-term exposure, since the MVA for all concentrations tested only indicated localized lesions that did not compromise gills functionality of exposed fish.
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Wang H, Tang L, Wei H, Lu J, Mu C, Wang C. Transcriptomic analysis of adaptive mechanisms in response to sudden salinity drop in the mud crab, Scylla paramamosain. BMC Genomics 2018; 19:421. [PMID: 29855258 PMCID: PMC5984308 DOI: 10.1186/s12864-018-4803-x] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Accepted: 05/18/2018] [Indexed: 11/25/2022] Open
Abstract
Background Scylla paramamosain (Crustacea: Decapoda: Portunidae: Syclla De Hann) is a commercially important mud crab distributed along the coast of southern China and other Indo-Pacific countries (Lin Z, Hao M, Zhu D, et al, Comp Biochem Physiol B Biochem Mol Biol 208-209:29–37, 2017; Walton ME, Vay LL, Lebata JH, et al, Estuar Coast Shelf Sci 66(3–4):493–500, 2006; Wang Z, Sun B, Zhu F, Fish Shellfish Immunol 67:612–9, 2017). While S. paramamosain is a euryhaline species, a sudden drop in salinity induces a negative impact on growth, molting, and reproduction, and may even cause death. The mechanism of osmotic regulation of marine crustaceans has been recently under investigation. However, the mechanism of adapting to a sudden drop in salinity has not been reported. Methods In this study, transcriptomics analysis was conducted on the gills of S. paramamosain to test its adaptive capabilities over 120 h with a sudden drop in salinity from 23 ‰ to 3 ‰. Results At the level of transcription, 135 DEGs (108 up-regulated and 27 down-regulated) annotated by NCBI non-redundant (nr) protein database were screened. GO analysis showed that the catalytic activity category showed the most participating genes in the 24 s-tier GO terms, indicating that intracellular metabolic activities in S. paramamosain were enhanced. Of the 164 mapped KEGG pathways, seven of the top 20 pathways were closely related to regulation of the Na+ / K+ -ATPase. Seven additional amino acid metabolism-related pathways were also found, along with other important signaling pathways. Conclusion Ion transport and amino acid metabolism were key factors in regulating the salinity adaptation of S. paramamosain in addition to several important signaling pathways. Electronic supplementary material The online version of this article (10.1186/s12864-018-4803-x) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Huan Wang
- School of Marine Science, Ningbo University, Ningbo, 315211, Zhejiang, China.,Key Laboratory of Applied Marine Biotechnology, Ministry of Education, Ningbo University, Ningbo, 315211, Zhejiang, China
| | - Lei Tang
- School of Marine Science, Ningbo University, Ningbo, 315211, Zhejiang, China
| | - Hongling Wei
- School of Marine Science, Ningbo University, Ningbo, 315211, Zhejiang, China
| | - Junkai Lu
- School of Marine Science, Ningbo University, Ningbo, 315211, Zhejiang, China
| | - Changkao Mu
- School of Marine Science, Ningbo University, Ningbo, 315211, Zhejiang, China.,Key Laboratory of Applied Marine Biotechnology, Ministry of Education, Ningbo University, Ningbo, 315211, Zhejiang, China
| | - Chunlin Wang
- School of Marine Science, Ningbo University, Ningbo, 315211, Zhejiang, China. .,Key Laboratory of Applied Marine Biotechnology, Ministry of Education, Ningbo University, Ningbo, 315211, Zhejiang, China.
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da Costa ST, Gressler LT, Sutili FJ, Loebens L, Fernandes MN, Lazzari R, Baldisserotto B. Humic acid of commercial origin causes changes in gill morphology of silver catfish Rhamdia quelen
exposed to acidic water. J Exp Zool 2017; 327:504-512. [DOI: 10.1002/jez.2136] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2017] [Revised: 11/15/2017] [Accepted: 11/20/2017] [Indexed: 01/30/2023]
Affiliation(s)
- Silvio T. da Costa
- Departamento de Morfologia; Universidade Federal de Santa Maria (UFSM); Santa Maria RS Brazil
| | - Luciane T. Gressler
- Laboratório de Fisiologia de Peixes (LAFIPE), Departamento de Fisiologia e Farmacologia; Universidade Federal de Santa Maria (UFSM); Santa Maria RS Brazil
| | - Fernando J. Sutili
- Laboratório de Fisiologia de Peixes (LAFIPE), Departamento de Fisiologia e Farmacologia; Universidade Federal de Santa Maria (UFSM); Santa Maria RS Brazil
| | - Luíza Loebens
- Departamento de Morfologia; Universidade Federal de Santa Maria (UFSM); Santa Maria RS Brazil
| | - Marisa N. Fernandes
- Laboratório de Zoofisiologia e Bioquímica Comparativa, Departamento de Ciências Fisiológicas; Universidade Federal de São Carlos (UFSCar); São Carlos SP Brazil
| | - Rafael Lazzari
- Departamento de Zootecnia e Ciências Biológicas; Universidade Federal de Santa Maria (UFSM); Palmeira das Missões RS Brazil
| | - Bernardo Baldisserotto
- Laboratório de Fisiologia de Peixes (LAFIPE), Departamento de Fisiologia e Farmacologia; Universidade Federal de Santa Maria (UFSM); Santa Maria RS Brazil
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Phuong LM, Huong DT, Nyengaard JR, Bayley M. Gill remodelling and growth rate of striped catfish Pangasianodon hypophthalmus under impacts of hypoxia and temperature. Comp Biochem Physiol A Mol Integr Physiol 2017; 203:288-96. [PMID: 27768904 DOI: 10.1016/j.cbpa.2016.10.006] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Revised: 10/11/2016] [Accepted: 10/14/2016] [Indexed: 01/01/2023]
Abstract
Gill morphometric and gill plasticity of the air-breathing striped catfish (Pangasianodon hypophthalmus) exposed to different temperatures (present day 27°C and future 33°C) and different air saturation levels (92% and 35%) during 6weeks were investigated using vertical sections to estimate the respiratory lamellae surface areas, harmonic mean barrier thicknesses, and gill component volumes. Gill respiratory surface area (SA) and harmonic mean water - blood barrier thicknesses (HM) of the fish were strongly affected by both environmental temperature and oxygen level. Thus initial values for 27°C normoxic fish (12.4±0.8g) were 211.8±21.6mm2g-1 and 1.67±0.12μm for SA and HM respectively. After 5weeks in same conditions or in the combinations of 33°C and/or PO2 of 55mmHg, this initial surface area scaled allometrically with size for the 33°C hypoxic group, whereas branchial SA was almost eliminated in the 27°C normoxic group, with other groups intermediate. In addition, elevated temperature had an astounding effect on growth with the 33°C group growing nearly 8-fold faster than the 27°C fish.
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da Cruz AL, Fernandes MN. What is the most efficient respiratory organ for the loricariid air-breathing fish Pterygoplichthys anisitsi, gills or stomach? A quantitative morphological study. ZOOLOGY 2016; 119:526-533. [PMID: 27618705 DOI: 10.1016/j.zool.2016.08.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2015] [Revised: 06/29/2016] [Accepted: 08/23/2016] [Indexed: 01/16/2023]
Abstract
The purpose of the present study was to evaluate the morphometric respiratory potential of gills compared to the stomach in obtaining oxygen for aerobic metabolism in Pterygoplichthys anisitsi, a facultative air-breathing fish. The measurements were done using stereological methods. The gills showed greater total volume, volume-to-body mass ratio, potential surface area, and surface-to-volume ratio than the stomach. The water-blood diffusion barrier of the gills is thicker than the air-blood diffusion barrier of the stomach. Taken together, the surface area, the surface-to-volume ratio and the diffusion distance for O2 transfer from the respiratory medium to blood yield a greater diffusing capacity for gills than for the stomach, suggesting greater importance of aquatic respiration in this species. On the other hand, water breathing is energetically more expensive than breathing air. Under severe hypoxic conditions, O2 uptake by the stomach is more efficient than by the gills, although the stomach has a much lower diffusing capacity. Thus, P. anisitsi uses gills under normoxic conditions but the stomach may also support aerobic metabolism depending on environmental conditions.
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Affiliation(s)
- André Luis da Cruz
- Institute of Biology, Department of Zoology, Federal University of Bahia, Rua Barão de Geremoabo 147, 40170-115 Salvador, Bahia, Brazil.
| | - Marisa Narciso Fernandes
- Department of Physiological Sciences, Federal University of São Carlos, Rod. Washington Luis km 235, 13565-905 São Carlos, São Paulo, Brazil
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Huang CY, Lin HC. Different Oxygen Stresses on the Responses of Branchial Morphology and Protein Expression in the Gills and Labyrinth Organ in the Aquatic Air-breathing Fish, Trichogaster microlepis. Zool Stud 2016; 55:e27. [PMID: 31966172 PMCID: PMC6511816 DOI: 10.6620/zs.2016.55-27] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2015] [Accepted: 03/09/2016] [Indexed: 11/18/2022]
Abstract
Chun-Yen Huang and Hui-Chen Lin (2016) Organisms face direct challenges from a variety of abiotic factors in the environment. Changes in dissolved oxygen are one of the most common types of these challenges. The gills of some fish species can compensate for ambient oxygen changes by exhibiting morphological and functional plasticity that give the gill the ability to modify its structure. In the previous studies of aquatic air- breathing fish with an accessory air-breathing organ (the labyrinth organ), we found morphological and functional specializations between the 1st and 4th gills in the genus Trichogaster. This study investigated morphological and functional changes in the gills and labyrinth organ of the aquatic air-breathing fish T. microlepis over a 28- day period of oxygen uptake stresses. The experimental design was as follows: (1) a control group (held under normoxia with air-breathing respiration (ABR) allowed); (2) a hypoxic group (held under hypoxia with ABR); and (3) a restricted group (held under normoxia without ABR). We recorded the cumulative mortality of the fish and the frequency of ABR between the control and hypoxic groups, conducted morphological examinations of the lengths of gill filaments and lamellae of gills and determined the relative abundance of carbonic anhydrase II (CAII) and Na+/K+-ATPase (NKA). Mortality in the restricted group was higher than those in the control and the hypoxic groups. The frequency of ABR in the hypoxic condition was higher than that in the control. The lengths of the lamellae in the 1st, 3rd and 4th gills in the restricted group were significantly longer than those in the control group after 14 and 28 days. In addition, the relative abundance of CAII was significantly increased only in the labyrinth organ in the hypoxic group compared to the control group on day 3. The relative abundance of proliferating cell nuclear antigen also was significantly increased in the 1st gill, 4th gill and the labyrinth organ in the restricted group compared to the control group on day 14. This study showed, for the first time, that the 4th gill in T. microlepis, which is generally much-reduced compared to the other gills, can have elongated lamellae when fish are subjected to the restricted group for 28 day. The relative abundance of CAII in the labyrinth organ was significantly higher under hypoxic group than under control group on day 3.
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Affiliation(s)
- Chun-Yen Huang
- Department of Life Science, Tunghai University, Taichung
40704, Taiwan
- Medical Research Department, E-Da Hospital, Kaohsiung
City, 82445, Taiwan
| | - Hui-Chen Lin
- Department of Life Science, Tunghai University, Taichung
40704, Taiwan
- Center for Tropical Ecology and Biodiversity, Tunghai
University, Taichung 40704, Taiwan
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Abstract
ABSTRACT
Salinity represents a critical environmental factor for all aquatic organisms, including fishes. Environments of stable salinity are inhabited by stenohaline fishes having narrow salinity tolerance ranges. Environments of variable salinity are inhabited by euryhaline fishes having wide salinity tolerance ranges. Euryhaline fishes harbor mechanisms that control dynamic changes in osmoregulatory strategy from active salt absorption to salt secretion and from water excretion to water retention. These mechanisms of dynamic control of osmoregulatory strategy include the ability to perceive changes in environmental salinity that perturb body water and salt homeostasis (osmosensing), signaling networks that encode information about the direction and magnitude of salinity change, and epithelial transport and permeability effectors. These mechanisms of euryhalinity likely arose by mosaic evolution involving ancestral and derived protein functions. Most proteins necessary for euryhalinity are also critical for other biological functions and are preserved even in stenohaline fish. Only a few proteins have evolved functions specific to euryhaline fish and they may vary in different fish taxa because of multiple independent phylogenetic origins of euryhalinity in fish. Moreover, proteins involved in combinatorial osmosensing are likely interchangeable. Most euryhaline fishes have an upper salinity tolerance limit of approximately 2× seawater (60 g kg−1). However, some species tolerate up to 130 g kg−1 salinity and they may be able to do so by switching their adaptive strategy when the salinity exceeds 60 g kg−1. The superior salinity stress tolerance of euryhaline fishes represents an evolutionary advantage favoring their expansion and adaptive radiation in a climate of rapidly changing and pulsatory fluctuating salinity. Because such a climate scenario has been predicted, it is intriguing to mechanistically understand euryhalinity and how this complex physiological phenotype evolves under high selection pressure.
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Duncan WP, Silva MID, Fernandes MN. Gill dimensions in near-term embryos of Amazonian freshwater stingrays (Elasmobranchii: Potamotrygonidae) and their relationship to the lifestyle and habitat of neonatal pups. Neotrop ichthyol 2015. [DOI: 10.1590/1982-0224-20140132] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This comparative study of gill morphometrics in near-term embryos of freshwater stingray potamotrygonids examines gill dimensions in relation to neonatal lifestyle and habitat. In embryos of the potamotrygonids Paratrygon aiereba, Plesiotrygon iwamae, Potamotrygon motoro, Potamotrygon orbignyi, and cururu ray Potamotrygon sp. the number and length of filaments, total gill surface area, mass-specific surface area, water-blood diffusion distance, and anatomical diffusion factor were analysed. In all potamotrygonids, the 3rd branchial arch possessed a larger respiratory surface than the other gill arches. Larger embryos had more gill surface area and large spiracles, which are necessary to maintain the high oxygen uptake needed due to their larger body size. However, the higher mass-specific gill surface area observed in near-term embryos may be advantageous because neonates can use hypoxic environments as refuges against predators, as well as catch small prey that inhabit the same environment. As expected from their benthic mode of life, freshwater stingrays are sluggish animals compared to pelagic fishes. However, based on gill respiratory morphometry (such as gill area, mass-specific gill area, the water-blood diffusion barrier, anatomical diffusion factor, and relative opening of the spiracle), subtypes of lifestyles can be observed corresponding to: active, intermediate, and sluggish species according to Gray's scale.
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Agamy E. Sub chronic exposure to crude oil, dispersed oil and dispersant induces histopathological alterations in the gills of the juvenile rabbit fish (Siganus canaliculatus). Ecotoxicol Environ Saf 2013; 92:180-190. [PMID: 23602413 DOI: 10.1016/j.ecoenv.2013.03.027] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2012] [Revised: 03/24/2013] [Accepted: 03/25/2013] [Indexed: 06/02/2023]
Abstract
There is little existing information on the sub-lethal effects of experimental exposure of Arabian Gulf fish to oil pollution. This study investigated the potential sub-lethal effects of the water accommodated fraction (WAF) of light Arabian crude oil, dispersed oil and dispersant (Maxi Clean 2) on the gills of the juvenile rabbit fish (Siganus canaliculatus), observing several histopathological biomarkers at different time points and different doses. These laboratory exposures simulated a range of possible oil pollution events. Significant alterations in four health categories (circulatory, proliferative, degenerative and inflammatory) were identified and form the basis for understanding the short-term response of fish to oil. Evaluations of histopathological lesions in gill tissue were carried out following 3, 6, 9, 12, 15, 18 and 21 days of exposure. The main lesions observed and quantified were lamellar capillary aneurysms, vasodilatation of lamellae, hemorrhage, edema, lifting of lamellar and filamentary epithelium and epithelium necrosis, epithelial and chloride cell hypertrophy and hyperplasia, fusion of adjacent lamellae, epitheliocystis and inflammatory infiltration. Exposure of juvenile fish to WAF, dispersant oil and dispersant caused significant changes in the gill lesions and reaction patterns. Dispersed oil caused the most significant effect followed by WAF and then dispersant. The present study is one of the first which explores the relationship between oil pollution and epitheliocystis and reports that exposure to crude oil and dispersed oil increases the prevalence of epitheliocystis formation under controlled laboratory conditions.
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Affiliation(s)
- Esam Agamy
- Department of Basic Sciences, College of Medicine, University of Sharjah, Sharjah, United Arab Emirates.
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Agamy E. Impact of laboratory exposure to light Arabian crude oil, dispersed oil and dispersant on the gills of the juvenile brown spotted grouper (Epinephelus chlorostigma): a histopathological study. Mar Environ Res 2013; 86:46-55. [PMID: 23535015 DOI: 10.1016/j.marenvres.2013.02.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2012] [Revised: 02/21/2013] [Accepted: 02/23/2013] [Indexed: 06/02/2023]
Abstract
The present study investigated the impact of subchronic exposure of the water accommodated fraction (WAF) of light Arabian crude oil, dispersed oil and dispersant on the gills of the juvenile brown spotted grouper (Epinephelus chlorostigma), observing several histopathological lesions at different time points and different concentrations. Significant alterations, compared to the control groups (p < 0.05), in four health categories (circulatory, proliferative, degenerative and inflammatory) were identified. Evaluations of histopathological lesions in gill tissue were carried out following 3, 6, 9, 12, 15, 18 and 21 days of exposure. The main lesions observed were circulatory (lamellar aneurysms, vasodilatation and hemorrhage), degenerative (edema, lifting of lamellar and filamentary epithelium and epithelium necrosis), proliferative (hypertrophy and hyperplasia of epithelial, mucous and chloride cells, fusion of adjacent lamellae), and inflammatory (lymphocytic infiltration). These results provide a tool for evaluating reclamation initiatives, such as the use of dispersants, and lead to better risk evaluations and environmental health in natural and reclaimed systems.
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Affiliation(s)
- Esam Agamy
- Department of Basic Sciences, College of Medicine, University of Sharjah, Sharjah, United Arab Emirates.
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Fernandes MN, Paulino MG, Sakuragui MM, Ramos CA, Pereira CDS, Sadauskas-Henrique H. Organochlorines and metals induce changes in the mitochondria-rich cells of fish gills: an integrative field study involving chemical, biochemical and morphological analyses. Aquat Toxicol 2013; 126:180-190. [PMID: 23220410 DOI: 10.1016/j.aquatox.2012.11.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2012] [Revised: 11/07/2012] [Accepted: 11/08/2012] [Indexed: 06/01/2023]
Abstract
Through integrating chemical, biochemical and morphological analyses, this study investigated the effects of multiple pollutants on the gill mitochondria-rich cells (MRCs) in two fish species, Astyanax fasciatus and Pimelodus maculatus, collected from five sites (FU10, FU20, FU30, FU40 and FU50) in the Furnas Hydroelectric Power Station reservoir. Water analyses revealed aluminum, iron and zinc as well as organochlorine (aldrin/dieldrin, endosulfan, heptachlor/heptachlor epoxide and metolachlor) contamination at all of the sites, with the exception of FU10. Copper, chrome, iron and zinc were detected in the gills of both species, and aldrin/dieldrin, endosulfan and heptachlor/heptachlor epoxide were detected in the gills of fish from all of the sites, with the exception of FU10. Fish collected at FU20, FU30 and FU50 exhibited numerous alterations in the surface architecture of their pavement cells and MRCs. The surface MRC density and MRC fractional area were lower in fish from FU20, FU30, FU40 and FU50 than in those from the reference site (FU10) in the winter, and some variability between the sites was observed in the summer. The organochlorine contamination at FU20 and FU50 was associated with variable changes in the MRCs and inhibition of Na(+)/K(+)-ATPase (NKA) activity, especially in P. maculatus. At FU30, the alterations in the MRCs were associated with the contaminants present, especially metals. A multivariate analysis demonstrated a positive association between the biological responses of both species and environmental contamination, indicating that under realistic conditions, a mixture of organochlorines and metals affected the MRCs by inhibiting NKA activity and inducing morphological changes, which may cause an ionic imbalance.
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Affiliation(s)
- M N Fernandes
- Physiological Sciences Department, Federal University of São Carlos, São Paulo, Brazil.
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Fernandes MN, da Cruz AL, da Costa OTF, Perry SF. Morphometric partitioning of the respiratory surface area and diffusion capacity of the gills and swim bladder in juvenile Amazonian air-breathing fish, Arapaima gigas. Micron 2012; 43:961-70. [DOI: 10.1016/j.micron.2012.03.018] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2011] [Revised: 03/16/2012] [Accepted: 03/23/2012] [Indexed: 11/19/2022]
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Turko AJ, Cooper CA, Wright PA. Gill remodelling during terrestrial acclimation reduces aquatic respiratory function of the amphibious fish Kryptolebias marmoratus. ACTA ACUST UNITED AC 2012; 215:3973-80. [PMID: 22899534 DOI: 10.1242/jeb.074831] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The skin-breathing amphibious fish Kryptolebias marmoratus experiences rapid environmental changes when moving between water- and air-breathing, but remodelling of respiratory morphology is slower (~1 week). We tested the hypotheses that (1) there is a trade-off in respiratory function of gills displaying aquatic versus terrestrial morphologies and (2) rapidly increased gill ventilation is a mechanism to compensate for reduced aquatic respiratory function. Gill surface area, which varied inversely to the height of the interlamellar cell mass, was increased by acclimating fish for 1 week to air or low ion water, or decreased by acclimating fish for 1 week to hypoxia (~20% dissolved oxygen saturation). Fish were subsequently challenged with acute hypoxia, and gill ventilation or oxygen uptake was measured. Fish with reduced gill surface area increased ventilation at higher dissolved oxygen levels, showed an increased critical partial pressure of oxygen and suffered impaired recovery compared with brackish water control fish. These results indicate that hyperventilation, a rapid compensatory mechanism, was only able to maintain oxygen uptake during moderate hypoxia in fish that had remodelled their gills for land. Thus, fish moving between aquatic and terrestrial habitats may benefit from cutaneously breathing oxygen-rich air, but upon return to water must compensate for a less efficient branchial morphology (mild hypoxia) or suffer impaired respiratory function (severe hypoxia).
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Affiliation(s)
- Andy J Turko
- Department of Integrative Biology, University of Guelph, 488 Gordon Street, Guelph, Ontario, Canada.
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Paulino MG, Souza NES, Fernandes MN. Subchronic exposure to atrazine induces biochemical and histopathological changes in the gills of a Neotropical freshwater fish, Prochilodus lineatus. Ecotoxicol Environ Saf 2012; 80:6-13. [PMID: 22364844 DOI: 10.1016/j.ecoenv.2012.02.001] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2011] [Revised: 02/03/2012] [Accepted: 02/05/2012] [Indexed: 05/31/2023]
Abstract
The impact of acute (48 h) and subchronic (14 days) exposures to environmentally realistic atrazine concentrations (2, 10 and 25 μg L(-1)) were evaluated on the gills of Prochilodus lineatus by assessing the activity of superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx) and glutathione-S-transferase (GST), the levels of reduced glutathione (GSH) and lipid peroxide (LPO) as well as the histopathological damage. Acute and subchronic exposure to atrazine at 2 or 25 μg L(-1) did not change the activities of GST, SOD, CAT or GPx or the concentrations of GSH and LPO; however, subchronic exposure to 10 μg L(-1) increased the activity of GST, SOD and CAT and the LPO level. Histopathological indexes indicated normal gill function with scattered epithelial changes after acute and chronic exposure to 2 or 10 μg L(-1) of atrazine; however, fish chronically exposed to 25 μg L(-1) of atrazine, although had scattered lesions, the severity of lesions resulted in slightly to moderately gill damage. Acute exposure to atrazine decreased the type 3 MCs (containing acid mucosubstances with sulfate esters) in fish exposed to 2 or 10 μg L(-1) and increased the type 4 MCs (containing all types of mucosubstances) in fish exposed to 25 μg L(-1). Chronic exposure to atrazine reduced the type 3 MCs in fish exposed to 10 or 25 μg L(-1). The gills showed a low sensitivity to atrazine after acute exposure. However, the persistence of atrazine in water (subchronic exposure) promoted an increase of LPO levels in the gills and increased the frequency and severity of histopathological changes. The decreased density of type 3 MCs in fish exposed to atrazine suggests a mechanism to wash toxic substances away from the gill surface.
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Affiliation(s)
- M G Paulino
- Department of Physiological Sciences, Federal University of São Carlos, São Carlos, SP, Brazil
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Duncan WP, Silva NF, Fernandes MN. Mitochondrion-rich cells distribution, Na+/K+-ATPase activity and gill morphometry of the Amazonian freshwater stingrays (Chondrichthyes: Potamotrygonidae). Fish Physiol Biochem 2011; 37:523-531. [PMID: 21132527 DOI: 10.1007/s10695-010-9454-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2010] [Accepted: 11/22/2010] [Indexed: 05/30/2023]
Abstract
Detailed measurements of gill area and constituent variables (total filament number, total filament length and mean filament length), and immunolocalization of the α-subunit of Na⁺/K⁺-ATPase and Na⁺/K⁺-ATPase activity were performed on both hemibranchs of all five arches of freshwater potamotrygonid stingrays (Paratrygon aiereba and Potamotrygon sp.). Both species exhibit similar mass-specific gill area, 89.8 ± 6.6 and 91.5 ± 4.3 mm² g⁻¹ for P. aiereba and Potamotrygon sp., respectively. The density of Na⁺/K⁺-ATPase-rich MRCs and Na⁺/K⁺-ATPase activity was higher in the 4th gill arch in both species. The Na⁺/K⁺-ATPase activity was positively correlated to the Na⁺/K⁺-ATPase-rich Na⁺/K⁺-ATPase rich) mitochondrion-rich cell (MRC) distribution among the gill arches of P. aiereba but not in Potamotrygon sp. The levels Na⁺/K⁺-ATPase activity were not correlated to the gill surface area among the arches for both rays' species. Considering that the Na⁺/K⁺-ATPase-rich MRC is the main site for active ion transport in the gill epithelia and Na⁺/K⁺-ATPase activity plays a crucial role in osmoionoregulatory function, we suggesting that 4th gill arch is more relevant for osmoregulation and ion balance in these potamotrygonids.
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Affiliation(s)
- Wallice P Duncan
- Departamento de Morfologia, Universidade Federal do Amazonas, Avenida General Rodrigo Octávio Jordão Ramos, 3000. Coroado I, Manaus, Amazonas 69.077-000, Brazil.
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26
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Moron SE, Andrade CAD, Fernandes MN. Response of mucous cells of the gills of traíra (Hoplias malabaricus) and jeju (Hoplerythrinus unitaeniatus) (Teleostei: Erythrinidae) to hypo- and hyper-osmotic ion stress. Neotrop ichthyol 2009. [DOI: 10.1590/s1679-62252009000300017] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The mucous cells (MC) of traíra, Hoplias malabaricus, and jeju, Hoplerythrinus unitaeniatus, two ecologically distinct erythrinid species, were analyzed in fish exposed to deionized (DW) and high ion concentration (NaCl and Ca2+) water (HIW) during 15 days to evaluate the MC responses to ion challenge. MCs are localized in the leading and trailing edge and, interlamellar region of the gill filament epithelium but, in H. unitaeniatus, they are also found in the breathing or lamellar epithelium. MC density is lower in H. malabaricus, the exclusively water-breathing fish, than in H. unitaeniatus, a facultative air-breathing fish. The transference to DW or HIW did not change the MC density and surface area, excepting in H. malabaricus, in the first day of exposure to DW. A single MC containing three types of glycoproteins (neutral, acidic and sulphated) was identified in the gill epithelium of both, H. malabaricus and H. unitaeniatus. The amount (based on the intensity of histochemistry reaction) of these glycoproteins differed between the species and were altered after exposure to DW and HIW showing little adjustments in the amount of mucosubstances in the MC of H. malabaricus and reduction of acidic and sulphated glycoproteins in H. unitaeniatus. The decreasing of these glycoproteins in H. unitaeniatus reduced the mucus protection against desiccation of gill tissue when change the ion concentration in water.
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Sitjà-Bobadilla A, Alvarez-Pellitero P. Experimental transmission of Sparicotyle chrysophrii (Monogenea: Polyopisthocotylea) to gilthead seabream (Sparus aurata) and histopathology of the infection. Folia Parasitol (Praha) 2009; 56:143-51. [DOI: 10.14411/fp.2009.018] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Tang CH, Chang IC, Chen CH, Lee TH, Hwang PP. Phenotypic changes in mitochondrion-rich cells and responses of Na+/K+-ATPase in gills of tilapia exposed to deionized water. Zoolog Sci 2008; 25:205-11. [PMID: 18533752 DOI: 10.2108/zsj.25.205] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2007] [Accepted: 10/11/2007] [Indexed: 11/17/2022]
Abstract
The aim of this study was to illustrate the phenotypic modification of mitochondrion-rich (MR) cells and Na(+)/K(+)-ATPase (NKA) responses, including relative protein abundance, specific activity, and immunolocalization in gills of euryhaline tilapia exposed to deionized water (DW) for one week. The plasma osmolality was not significantly different between tilapia of the local fresh water (LFW) group and DW group. Remodeling of MR cells occurred in DW-exposed fish. After transfer to DW for one week, the relative percentage of subtype-I (wavy-convex) MR cells with apical size ranging from 3 to 9 microm increased and eventually became the dominant MR cell subtype. In DW tilapia gills, relative percentages of lamellar NKA immunoreactive (NKIR) cells among total NKIR cells increased to 29% and led to significant increases in the number of NKIR cells. In addition, the relative protein abundance and specific activity of NKA were significantly higher in gills of the DW-exposed fish. Our study concluded that tilapia require the development of subtype-I MR cells, the presence of lamellar NKIR cells, and enhancement of NKA protein abundance and activity in gills to deal with the challenge of an ion-deficient environment.
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Affiliation(s)
- Cheng-Hao Tang
- Department of Life Sciences, National Chung-Hsing University, Taichung, 402 Taiwan
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Scott GR, Wood CM, Sloman KA, Iftikar FI, De Boeck G, Almeida-Val VMF, Val AL. Respiratory responses to progressive hypoxia in the Amazonian oscar, Astronotus ocellatus. Respir Physiol Neurobiol 2008; 162:109-16. [PMID: 18555751 DOI: 10.1016/j.resp.2008.05.001] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2008] [Revised: 04/29/2008] [Accepted: 05/01/2008] [Indexed: 12/18/2022]
Abstract
This study determined the respiratory responses to progressive hypoxia in oscar, an extremely hypoxia-tolerant Amazonian cichlid. Oscar depressed oxygen consumption rates (MO2), beginning at a critical O2 tension (Pcrit) of 46Torr, to only 14% of normoxic rates at 10Torr. Total ventilation (Vw) increased up to 4-fold, entirely due to a rise in ventilatory stroke volume (no change in ventilatory frequency), and water convection requirement (Vw/MO2) increased substantially (up to 15-fold). Gill O2 extraction fell steadily, from 60% down to 40%. Although O2 transfer factor (an index of gill O2 diffusion capacity) increased transiently in moderate hypoxia, it decreased at 10Torr, which may have caused the increased expired-arterial PO2 difference. Venous PO2 was always very low (< or =7Torr). Anaerobic metabolism made a significant contribution to ATP supply, indicated by a 3-fold increase in plasma lactate that resulted in an uncompensated metabolic acidosis. Respiration of isolated gill cells was not inhibited until below 5Torr; because gill water PO2 always exceeded this value, hypoxic ion flux arrest in oscars [Wood et al., Am. J. Physiol. Reg. Integr. Comp. Physiol. 292, R2048-R2058, 2007] is probably not caused by O2 limitation in ionocytes. We conclude that metabolic depression and tolerance of anaerobic bi-products, rather than a superior capacity for O2 supply, allow oscar to thrive in extreme hypoxia in the Amazon.
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Affiliation(s)
- Graham R Scott
- Department of Zoology, University of British Columbia, Vancouver V6T 1Z4, Canada.
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31
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Lee W, Huang CY, Lin HC. The source of lamellar mitochondria-rich cells in the air-breathing fish,Trichogaster leeri. ACTA ACUST UNITED AC 2008; 309:198-205. [DOI: 10.1002/jez.446] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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32
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Huang CY, Lee W, Lin HC. Functional differentiation in the anterior gills of the aquatic air-breathing fish, Trichogaster leeri. J Comp Physiol B 2007; 178:111-21. [DOI: 10.1007/s00360-007-0205-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2007] [Revised: 08/15/2007] [Accepted: 08/17/2007] [Indexed: 11/29/2022]
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Da Costa OTF, Pedretti ACE, Schmitz A, Perry SF, Fernandes MN. Stereological estimation of surface area and barrier thickness of fish gills in vertical sections. J Microsc 2007; 225:1-9. [PMID: 17286690 DOI: 10.1111/j.1365-2818.2007.01710.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Previous morphometric methods for estimation of the volume of components, surface area and thickness of the diffusion barrier in fish gills have taken advantage of the highly ordered structure of these organs for sampling and surface area estimations, whereas the thickness of the diffusion barrier has been measured orthogonally on perpendicularly sectioned material at subjectively selected sites. Although intuitively logical, these procedures do not have a demonstrated mathematical basis, do not involve random sampling and measurement techniques, and are not applicable to the gills of all fish. The present stereological methods apply the principles of surface area estimation in vertical uniform random sections to the gills of the Brazilian teleost Arapaima gigas. The tissue was taken from the entire gill apparatus of the right-hand or left-hand side (selected at random) of the fish by systematic random sampling and embedded in glycol methacrylate for light microscopy. Arches from the other side were embedded in Epoxy resin. Reference volume was estimated by the Cavalieri method in the same vertical sections that were used for surface density and volume density measurements. The harmonic mean barrier thickness of the water-blood diffusion barrier was calculated from measurements taken along randomly selected orientation lines that were sine-weighted relative to the vertical axis. The values thus obtained for the anatomical diffusion factor (surface area divided by barrier thickness) compare favourably with those obtained for other sluggish fish using existing methods.
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Affiliation(s)
- Oscar T F Da Costa
- Departamento de Ciências Fisiológicas, Universidade Federal de São Carlos, 13565-905 São Carlos, SP, Brazil
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Hsiao CD, You MS, Guh YJ, Ma M, Jiang YJ, Hwang PP. A positive regulatory loop between foxi3a and foxi3b is essential for specification and differentiation of zebrafish epidermal ionocytes. PLoS One 2007; 2:e302. [PMID: 17375188 PMCID: PMC1810426 DOI: 10.1371/journal.pone.0000302] [Citation(s) in RCA: 114] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2007] [Accepted: 02/19/2007] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Epidermal ionocytes play essential roles in the transepithelial transportation of ions, water, and acid-base balance in fish embryos before their branchial counterparts are fully functional. However, the mechanism controlling epidermal ionocyte specification and differentiation remains unknown. METHODOLOGY/PRINCIPAL FINDINGS In zebrafish, we demonstrated that Delta-Notch-mediated lateral inhibition plays a vital role in singling out epidermal ionocyte progenitors from epidermal stem cells. The entire epidermal ionocyte domain of genetic mutants and morphants, which failed to transmit the DeltaC-Notch1a/Notch3 signal from sending cells (epidermal ionocytes) to receiving cells (epidermal stem cells), differentiates into epidermal ionocytes. The low Notch activity in epidermal ionocyte progenitors is permissive for activating winged helix/forkhead box transcription factors of foxi3a and foxi3b. Through gain- and loss-of-function assays, we show that the foxi3a-foxi3b regulatory loop functions as a master regulator to mediate a dual role of specifying epidermal ionocyte progenitors as well as of subsequently promoting differentiation of Na(+),K(+)-ATPase-rich cells and H(+)-ATPase-rich cells in a concentration-dependent manner. CONCLUSIONS/SIGNIFICANCE This study provides a framework to show the molecular mechanism controlling epidermal ionocyte specification and differentiation in a low vertebrate for the first time. We propose that the positive regulatory loop between foxi3a and foxi3b not only drives early ionocyte differentiation but also prevents the complete blockage of ionocyte differentiation when the master regulator of foxi3 function is unilaterally compromised.
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Affiliation(s)
- Chung-Der Hsiao
- Institute of Cellular and Organismic Biology, Academia Sinica, Taipei, Taiwan
- Institute of Molecular and Cell Biology, Singapore, Singapore
| | - May-Su You
- Institute of Molecular and Cell Biology, Singapore, Singapore
| | - Ying-Jey Guh
- Institute of Cellular and Organismic Biology, Academia Sinica, Taipei, Taiwan
- Graduate Institute of Life Sciences, National Defense Medical Center, Taipei, Taiwan
| | - Ming Ma
- Institute of Molecular and Cell Biology, Singapore, Singapore
| | - Yun-Jin Jiang
- Institute of Molecular and Cell Biology, Singapore, Singapore
- * To whom correspondence should be addressed. E-mail: (PPH); (YJJ)
| | - Pung-Pung Hwang
- Institute of Cellular and Organismic Biology, Academia Sinica, Taipei, Taiwan
- * To whom correspondence should be addressed. E-mail: (PPH); (YJJ)
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Rosso FLD, Bolner KCS, Baldisserotto B. Ion fluxes in silver catfish (Rhamdia quelen) juveniles exposed to different dissolved oxygen levels. Neotrop ichthyol 2006. [DOI: 10.1590/s1679-62252006000400007] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Low dissolved oxygen levels in the water (hypoxia) can be provoked by oxygen consumption by fish and other organisms, organic matter decomposition, phytoplankton blooms, and temperature increase. The objective of the present study was to investigate Na+, Cl-, K+, and ammonia fluxes in silver catfish (Rhamdia quelen) exposed to different dissolved oxygen levels. Juveniles (9 ± 1g) maintained at 6.0 mg.L-1 dissolved oxygen were transferred to four 40 L aquaria with different dissolved oxygen levels (in mg.L-1): 6.0, 4.5, 3.5, and 2.5. In another series of experiments, juveniles were acclimated at 6.0 or 2.5 mg.L-1 dissolved oxygen levels, and then placed in two 40 L aquaria with 6.0 mg.L-1 dissolved oxygen. For both series of experiments, 1, 24, 48 or 120 h after transference juveniles were placed in individual chambers of 200 mL (with the same dissolved oxygen levels of their respective aquaria) for 3 h. Water samples were collected for analysis of Na+, Cl-, K+, and ammonia levels. The obtained results allow concluding that exposure to 2.5 mg.L-1 dissolved oxygen levels promotes loss of ions and lower ammonia excretion in silver catfish juveniles, but these losses are rapidly stabilized for Na+ and Cl-. Exposure to less hypoxic levels also changes ion fluxes and ammonia excretion, but there is no clear relationship between both parameters in this species. Therefore, silver catfish osmoregulation seems to be affected when this species is transferred from normoxic to hypoxic waters and vice-versa.
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Alberto A, Camargo AFM, Verani JR, Costa OFT, Fernandes MN. Health variables and gill morphology in the tropical fish Astyanax fasciatus from a sewage-contaminated river. Ecotoxicol Environ Saf 2005; 61:247-55. [PMID: 15883096 DOI: 10.1016/j.ecoenv.2004.08.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2003] [Indexed: 05/02/2023]
Abstract
The relative condition factor (Kn), gonadosomatic index (GSI), selected hematological variables and gill morphology of the fish Astyanax fasciatus were analyzed in two sites (site 1 was unpolluted and site 2 was polluted with untreated domestic sewage) of a tropical river (Camanducaia river, Sao Paulo State, Brazil). The relationship between the body mass (M(B)) and the standard length (L(S)) of A. fasciatus from both sites was M(B)=0.00799 L(S)(3.51843). The Kn values from both males and females and the GSI of females were significantly higher in site 2. The mean corpuscular hemoglobin and mean corpuscular hemoglobin concentration were higher in females from site 2. Gill tissue anomalies and gill parasites were rare in fish from both sites; however, the number of chloride cells was significantly higher in fish from site 1. A. fasciatus presents high capacity to live in ion-poor and soft water and is able to compensate for environmental changes caused by untreated domestic sewage discharges.
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Affiliation(s)
- André Alberto
- Department of Physiological Sciences, Federal University of São Carlos-UFSCar, C. Postal 676, 13565-905 São Carlos, SP, Brazil
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