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Carneiro KDS, Franchi LP, Rocha TL. Carbon nanotubes and nanofibers seen as emerging threat to fish: Historical review and trends. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 913:169483. [PMID: 38151128 DOI: 10.1016/j.scitotenv.2023.169483] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2023] [Revised: 11/25/2023] [Accepted: 12/16/2023] [Indexed: 12/29/2023]
Abstract
Since the discovery of the third allotropic carbon form, carbon-based one-dimensional nanomaterials (1D-CNMs) became an attractive and new technology with different applications that range from electronics to biomedical and environmental technologies. Despite their broad application, data on environmental risks remain limited. Fish are widely used in ecotoxicological studies and biomonitoring programs. Thus, the aim of the current study was to summarize and critically analyze the literature focused on investigating the bioaccumulation and ecotoxicological impacts of 1D-CNMs (carbon nanotubes and nanofibers) on different fish species. In total, 93 articles were summarized and analyzed by taking into consideration the following aspects: bioaccumulation, trophic transfer, genotoxicity, mutagenicity, organ-specific toxicity, oxidative stress, neurotoxicity and behavioral changes. Results have evidenced that the analyzed studies were mainly carried out with multi-walled carbon nanotubes, which were followed by single-walled nanotubes and nanofibers. Zebrafish (Danio rerio) was the main fish species used as model system. CNMs' ecotoxicity in fish depends on their physicochemical features, functionalization, experimental design (e.g. exposure time, concentration, exposure type), as well as on fish species and developmental stage. CNMs' action mechanism and toxicity in fish are associated with oxidative stress, genotoxicity, hepatotoxicity and cardiotoxicity. Overall, fish are a suitable model system to assess the ecotoxicity of, and the environmental risk posed by, CNMs.
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Affiliation(s)
- Karla da Silva Carneiro
- Laboratory of Environmental Biotechnology and Ecotoxicology, Institute of Tropical Pathology and Health, Federal University of Goiás, Goiânia, Goiás, Brazil
| | - Leonardo Pereira Franchi
- Department of Biochemistry and Molecular Biology, Institute of Biological Sciences, Federal University of Goiás, Goiânia, Goiás, Brazil
| | - Thiago Lopes Rocha
- Laboratory of Environmental Biotechnology and Ecotoxicology, Institute of Tropical Pathology and Health, Federal University of Goiás, Goiânia, Goiás, Brazil.
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2
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Bischof I, Arnot JA, Jürling H, Knipschild G, Schlechtriem C, Schauerte A, Segner H. In vitro biotransformation assays using fish liver cells: Comparing rainbow trout and carp hepatocytes. FRONTIERS IN TOXICOLOGY 2022; 4:1021880. [PMID: 36211196 PMCID: PMC9538944 DOI: 10.3389/ftox.2022.1021880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Accepted: 09/05/2022] [Indexed: 11/23/2022] Open
Abstract
Biotransformation assays using primary hepatocytes from rainbow trout, Oncorhynchus mykiss, were validated as a reliable in vitro tool to predict in vivo bioconcentration factors (BCF) of chemicals in fish. Given the pronounced interspecies differences of chemical biotransformation, the present study aimed to compare biotransformation rate values and BCF predictions obtained with hepatocytes from the cold-water species, rainbow trout, to data obtained with hepatocytes of the warm-water species, common carp (Cyprinus carpio). In a first step, we adapted the protocol for the trout hepatocyte assay, including the cryopreservation method, to carp hepatocytes. The successful adaptation serves as proof of principle that the in vitro hepatocyte biotransformation assays can be technically transferred across fish species. In a second step, we compared the in vitro intrinsic clearance rates (CLin vitro, int) of two model xenobiotics, benzo[a]pyrene (BaP) and methoxychlor (MXC), in trout and carp hepatocytes. The in vitro data were used to predict in vivo biotransformation rate constants (kB) and BCFs, which were then compared to measured in vivo kB and BCF values. The CLin vitro, int values of BaP and MXC did not differ significantly between trout and carp hepatocytes, but the predicted BCF values were significantly higher in trout than in carp. In contrast, the measured in vivo BCF values did not differ significantly between the two species. A possible explanation of this discrepancy is that the existing in vitro-in vivo prediction models are parameterized only for trout but not for carp. Therefore, future research needs to develop species-specific extrapolation models.
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Affiliation(s)
- Ina Bischof
- Fraunhofer Institute for Molecular Biology and Applied Ecology, Schmallenberg, Germany
- Centre for Fish and Wildlife Health, University of Bern, Bern, Switzerland
- *Correspondence: Ina Bischof,
| | - Jon A. Arnot
- Department of Physical & Environmental Sciences, University of Toronto Scarborough, Toronto, ON, Canada
- ARC Arnot Research and Consulting, Toronto, ON, Canada
| | - Heinrich Jürling
- Fraunhofer Institute for Molecular Biology and Applied Ecology, Schmallenberg, Germany
| | - Georg Knipschild
- Fraunhofer Institute for Molecular Biology and Applied Ecology, Schmallenberg, Germany
| | | | - Anna Schauerte
- Fraunhofer Institute for Molecular Biology and Applied Ecology, Schmallenberg, Germany
| | - Helmut Segner
- Centre for Fish and Wildlife Health, University of Bern, Bern, Switzerland
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Sun J, Li J, Li Y, Du J, Zhao N, Mai K, Ai Q. Regulation of Δ6Fads2 Gene Involved in LC-PUFA Biosynthesis Subjected to Fatty Acid in Large Yellow Croaker ( Larimichthys crocea) and Rainbow Trout ( Oncorhynchus mykiss). Biomolecules 2022; 12:biom12050659. [PMID: 35625587 PMCID: PMC9139026 DOI: 10.3390/biom12050659] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 04/26/2022] [Accepted: 04/26/2022] [Indexed: 12/22/2022] Open
Abstract
Δ6 fatty acyl desaturase (Δ6Fads2) is regarded as the first rate-limiting desaturase that catalyzes the biosynthesis of long-chain polyunsaturated fatty acids (LC-PUFA) from 18-carbon fatty acid in vertebrates, but the underlying regulatory mechanism of fads2 has not been comprehensively understood. This study aimed to investigate the regulation role of fads2 subjected to fatty acid in large yellow croaker and rainbow trout. In vivo, large yellow croaker and rainbow trout were fed a fish oil (FO) diet, a soybean oil (SO) diet or a linseed oil (LO) diet for 10 weeks. The results show that LO and SO can significantly increase fads2 expression (p < 0.05). In vitro experiments were conducted in HEK293T cells or primary hepatocytes to determine the transcriptional regulation of fads2. The results show that CCAAT/enhancer-binding protein α (C/EBPα) can up-regulate fads2 expression. GATA binding protein 3 (GATA3) can up-regulate fads2 expression in rainbow trout but showed opposite effect in large yellow croaker. Furthermore, C/EBPα protein levels were significantly increased by LO and SO (p < 0.05), gata3 expression was increased in rainbow trout by LO but decreased in large yellow croaker by LO and SO. In conclusion, we revealed that FO replaced by LO and SO increased fads2 expression through a C/EBPα and GATA3 dependent mechanism in large yellow croaker and rainbow trout. This study might provide critical insights into the regulatory mechanisms of fads2 expression and LC-PUFA biosynthesis.
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Affiliation(s)
- Jie Sun
- The Key Laboratory of Aquaculture Nutrition and Feed (Ministry of Agriculture and Rural Affairs), The Key Laboratory of Mariculture (Ministry of Education), Ocean University of China, 5 Yushan Road, Qingdao 266003, China; (J.S.); (J.L.); (Y.L.); (J.D.); (N.Z.); (K.M.)
| | - Jingqi Li
- The Key Laboratory of Aquaculture Nutrition and Feed (Ministry of Agriculture and Rural Affairs), The Key Laboratory of Mariculture (Ministry of Education), Ocean University of China, 5 Yushan Road, Qingdao 266003, China; (J.S.); (J.L.); (Y.L.); (J.D.); (N.Z.); (K.M.)
| | - Yongnan Li
- The Key Laboratory of Aquaculture Nutrition and Feed (Ministry of Agriculture and Rural Affairs), The Key Laboratory of Mariculture (Ministry of Education), Ocean University of China, 5 Yushan Road, Qingdao 266003, China; (J.S.); (J.L.); (Y.L.); (J.D.); (N.Z.); (K.M.)
| | - Jianlong Du
- The Key Laboratory of Aquaculture Nutrition and Feed (Ministry of Agriculture and Rural Affairs), The Key Laboratory of Mariculture (Ministry of Education), Ocean University of China, 5 Yushan Road, Qingdao 266003, China; (J.S.); (J.L.); (Y.L.); (J.D.); (N.Z.); (K.M.)
| | - Nannan Zhao
- The Key Laboratory of Aquaculture Nutrition and Feed (Ministry of Agriculture and Rural Affairs), The Key Laboratory of Mariculture (Ministry of Education), Ocean University of China, 5 Yushan Road, Qingdao 266003, China; (J.S.); (J.L.); (Y.L.); (J.D.); (N.Z.); (K.M.)
| | - Kangsen Mai
- The Key Laboratory of Aquaculture Nutrition and Feed (Ministry of Agriculture and Rural Affairs), The Key Laboratory of Mariculture (Ministry of Education), Ocean University of China, 5 Yushan Road, Qingdao 266003, China; (J.S.); (J.L.); (Y.L.); (J.D.); (N.Z.); (K.M.)
- Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, 1 Wenhai Road, Qingdao 266237, China
| | - Qinghui Ai
- The Key Laboratory of Aquaculture Nutrition and Feed (Ministry of Agriculture and Rural Affairs), The Key Laboratory of Mariculture (Ministry of Education), Ocean University of China, 5 Yushan Road, Qingdao 266003, China; (J.S.); (J.L.); (Y.L.); (J.D.); (N.Z.); (K.M.)
- Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, 1 Wenhai Road, Qingdao 266237, China
- Correspondence: ; Tel.: +86-0532-82031943
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Xenobiotic metabolism and its physiological consequences in high-Antarctic Notothenioid fishes. Polar Biol 2021; 45:345-358. [PMID: 35221461 PMCID: PMC8818001 DOI: 10.1007/s00300-021-02992-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2021] [Revised: 12/07/2021] [Accepted: 12/09/2021] [Indexed: 10/24/2022]
Abstract
AbstractThe Antarctic ecosystem is progressively exposed to anthropogenic contaminants, such as polycyclic aromatic hydrocarbons (PAHs). So far, it is largely unknown if PAHs leave a mark in the physiology of high-Antarctic fish. We approached this issue via two avenues: first, we examined the functional response of the aryl hydrocarbon receptor (Ahr), which is a molecular initiating event of many toxic effects of PAHs in biota. Chionodraco hamatus and Trematomus loennbergii served as representatives for high-Antarctic Notothenioids, and Atlantic cod, Gadus morhua as non-polar reference species. We sequenced and cloned the Ahr ligand binding domain (LBD) of the Notothenioids and deployed a GAL4-based luciferase reporter gene assay expressing the Ahr LBD. Benzo[a]pyrene (BaP), beta-naphthoflavone and chrysene were used as ligands for the reporter gene assay. Second, we investigated the energetic costs of Ahr activation in isolated liver cells of the Notothenioids during acute, non-cytotoxic BaP exposure. In the reporter assay, the Ahr LBD of Atlantic cod and the Antarctic Notothenioids were activated by the ligands tested herein. In the in vitro assays with isolated liver cells of high-Antarctic Notothenioids, BaP exposure had no effect on overall respiration, but caused shifts in the respiration dedicated to protein synthesis. Thus, our study demonstrated that high-Antarctic fish possess a functional Ahr that can be ligand-activated in a concentration-dependent manner by environmental contaminants. This is associated with altered cost for cellular protein synthesis. Future studies have to show if the toxicant-induced activation of the Ahr pathway may lead to altered organism performance of Antarctic fish.
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Kropf C, Begnaud F, Gimeno S, Berthaud F, Debonneville C, Segner H. In Vitro Biotransformation Assays Using Liver S9 Fractions and Hepatocytes from Rainbow Trout (Oncorhynchus mykiss): Overcoming Challenges with Difficult to Test Fragrance Chemicals. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2020; 39:2396-2408. [PMID: 32915480 DOI: 10.1002/etc.4872] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Revised: 06/02/2020] [Accepted: 09/08/2020] [Indexed: 06/11/2023]
Abstract
In vitro metabolic stability assays using rainbow trout (Oncorhynchus mykiss) isolated hepatocytes (RT-HEP) or hepatic S9 fractions (RT-S9) were introduced to provide biotransformation rate data for the assessment of chemical bioaccumulation in fish. The present study explored the suitability of the RT-HEP and RT-S9 assays for difficult test chemicals, and the in vitro-based predictions were compared to in silico-based predictions and in vivo-measured bioconcentration factors (BCFs). The results show that volatile or reactive chemicals can be tested with minor modifications of the in vitro protocols. For hydrophobic chemicals, a passive dosing technique was developed. Finally, a design-of-experiment approach was used to identify optimal in vitro assay conditions. The modified assay protocols were applied to 10 fragrances with diverse physicochemical properties. The in vitro intrinsic clearance rates were higher in the S9 than in the hepatocyte assay, but the in vitro-in vivo (IVIV) predictions were comparable between the 2 assays. The IVIV predictions classified the test chemicals as nonbioaccumulative (BCF < 2000), which was in agreement with the in vivo data but in contrast to the in silico-based predictions. The findings from the present study provide strong evidence that the RT-HEP and RT-S9 assays can provide reliable estimates of in vivo biotransformation rates for test chemicals with difficult physicochemical properties. Environ Toxicol Chem 2020;39:2396-2408. © 2020 SETAC.
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Affiliation(s)
- Christian Kropf
- Centre for Fish and Wildlife Health, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Frédéric Begnaud
- Corporate R&D Division/Analytical Innovation, Firmenich International, Geneva, Switzerland
| | - Sylvia Gimeno
- Legal and Compliance, Firmenich Belgium, Louvain-La-Neuve, Belgium
| | - Fabienne Berthaud
- Corporate R&D Division/Analytical Innovation, Firmenich International, Geneva, Switzerland
| | - Christian Debonneville
- Corporate R&D Division/Analytical Innovation, Firmenich International, Geneva, Switzerland
| | - Helmut Segner
- Centre for Fish and Wildlife Health, Vetsuisse Faculty, University of Bern, Bern, Switzerland
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Iuchi K, Arai Y, Sasaki K, Sato N, Yokoyama C, Saruwatari T, Hisatomi H. A simple method for isolation and culture of primary hepatocytes from Salvelinus leucomaenis (White-spotted Charr). Cytotechnology 2020; 72:731-739. [PMID: 32779071 DOI: 10.1007/s10616-020-00415-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Accepted: 08/04/2020] [Indexed: 11/28/2022] Open
Abstract
White-spotted charr (Salvelinus leucomaenis, S. I.) is an anadromous cold water-adapted fish, distributed in the Far East. We have previously reported the complete mitochondrial DNA sequences of white-spotted chars (S. l. imbrius and S. l. pluvius) in Japan. In general, fish hepatocytes are useful for cellular and biochemical studies of fish. In this study, we isolated hepatocytes from the liver of white-spotted charr and used basic methods, such as enzyme digestion and low centrifugation, to analyze the molecular mechanisms involved in specific cellular responses. The isolated hepatocytes could be cultured at 5-20 °C but not 37 °C. The morphology of hepatocytes was altered in a temperature-dependent manner. The properties of hepatocyte were similar to those of living fish. Moreover, the proliferation rate and damage of isolated hepatocytes depended on the concentration of fetal bovine serum in the culture medium. Taken together, this study demonstrates that this simple method for isolation and culture of hepatocytes from white-spotted charr may be useful for other biochemical and cellular studies.
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Affiliation(s)
- Katsuya Iuchi
- Department of Materials and Life Science, Faculty of Science and Technology, Seikei University, 3-3-1 Kichijojikitamachi, Musashino-shi, Tokyo, 180-8633, Japan.
| | - Yasushi Arai
- Seikei Junior and Senior High School, 3-10-13 Kichijojikitamachi, Musashino-shi, Tokyo, 180-8633, Japan
| | - Kazuki Sasaki
- Department of Materials and Life Science, Faculty of Science and Technology, Seikei University, 3-3-1 Kichijojikitamachi, Musashino-shi, Tokyo, 180-8633, Japan
| | - Naoe Sato
- Seikei Junior and Senior High School, 3-10-13 Kichijojikitamachi, Musashino-shi, Tokyo, 180-8633, Japan
| | - Chikako Yokoyama
- Department of Biochemical Engineering, Graduate School of Science and Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata, 992-8510, Japan
| | - Toshiro Saruwatari
- Atmosphere and Ocean Research Institute, The Univeristy of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8564, Japan
| | - Hisashi Hisatomi
- Department of Materials and Life Science, Faculty of Science and Technology, Seikei University, 3-3-1 Kichijojikitamachi, Musashino-shi, Tokyo, 180-8633, Japan
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Zhu T, Corraze G, Plagnes-Juan E, Skiba-Cassy S. Cholesterol metabolism regulation mediated by SREBP-2, LXRα and miR-33a in rainbow trout (Oncorhynchus mykiss) both in vivo and in vitro. PLoS One 2020; 15:e0223813. [PMID: 32109243 PMCID: PMC7048274 DOI: 10.1371/journal.pone.0223813] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Accepted: 02/08/2020] [Indexed: 12/20/2022] Open
Abstract
Cholesterol metabolism is greatly affected in fish fed plant-based diet. The regulation of cholesterol metabolism is mediated by both transcriptional factors such as sterol regulatory element-binding proteins (SREBPs) and liver X receptors (LXRs), and posttranscriptional factors including miRNAs. In mammals, SREBP-2 and LXRα are involved in the transcriptional regulation of cholesterol synthesis and elimination, respectively. In mammals, miR-33a is reported to directly target genes involved in cholesterol catabolism. The present study aims to investigate the regulation of cholesterol metabolism by SREBP-2 and LXRα and miR-33a in rainbow trout using in vivo and in vitro approaches. In vivo, juvenile rainbow trout of ~72 g initial body weight were fed a total plant-based diet (V) or a marine diet (M) containing fishmeal and fish oil. In vitro, primary cell culture hepatocytes were stimulated by graded concentrations of 25-hydroxycholesterol (25-HC). The hepatic expression of cholesterol synthetic genes, srebp-2 and miR-33a as well as miR-33a level in plasma were increased in fish fed the plant-based diet, reversely, their expression in hepatocytes were inhibited with the increasing 25-HC in vitro. However, lxrα was not affected neither in vivo nor in vitro. Our results suggest that SREBP-2 and miR-33a synergistically enhance the expression of cholesterol synthetic genes but do not support the involvement of LXRα in the regulation of cholesterol elimination. As plasma level of miR-33a appears as potential indicator of cholesterol synthetic capacities, this study also highlights circulating miRNAs as promising noninvasive biomarker in aquaculture.
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Affiliation(s)
- Tengfei Zhu
- INRA, Univ Pau & Pays Adour, E2S UPPA, UMR 1419, Nutrition Métabolisme Aquaculture, Saint Pée sur Nivelle, France
| | - Geneviève Corraze
- INRA, Univ Pau & Pays Adour, E2S UPPA, UMR 1419, Nutrition Métabolisme Aquaculture, Saint Pée sur Nivelle, France
| | - Elisabeth Plagnes-Juan
- INRA, Univ Pau & Pays Adour, E2S UPPA, UMR 1419, Nutrition Métabolisme Aquaculture, Saint Pée sur Nivelle, France
| | - Sandrine Skiba-Cassy
- INRA, Univ Pau & Pays Adour, E2S UPPA, UMR 1419, Nutrition Métabolisme Aquaculture, Saint Pée sur Nivelle, France
- * E-mail:
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8
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Costa SR, Velasques RR, Hoff MLM, Souza MM, Sandrini JZ. Characterization of different DNA repair pathways in hepatic cells of Zebrafish (Danio rerio). DNA Repair (Amst) 2019; 83:102695. [DOI: 10.1016/j.dnarep.2019.102695] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Revised: 08/15/2019] [Accepted: 08/26/2019] [Indexed: 01/03/2023]
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Castaño A, Bols N, Braunbeck T, Dierickx P, Halder M, Isomaa B, Kawahara K, Lee LEJ, Mothersill C, Pärt P, Repetto G, Sintes JR, Rufli H, Smith R, Wood C, Segner H. The use of Fish Cells in Ecotoxicology: The Report and Recommendations of ECVAM Workshop 47,. Altern Lab Anim 2019; 31:317-51. [PMID: 15612875 DOI: 10.1177/026119290303100314] [Citation(s) in RCA: 106] [Impact Index Per Article: 21.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Argelia Castaño
- Animal Health Research Centre, Spanish National Institute for Food and Agrarian Research and Technology (CISA-INIA), 28130 Valdeolmos, Madrid, Spain
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Segner H. Cytotoxicity Assays with Fish Cells as an Alternative to the Acute Lethality Test with Fish. Altern Lab Anim 2019; 32:375-82. [PMID: 15651922 DOI: 10.1177/026119290403200409] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
In ecotoxicology, in vitro assays with fish cells are currently applied for mechanistic studies, bioanalytical purposes and toxicity screening. This paper discusses the potential of cytotoxicity assays with fish cells to reduce, refine or replace acute lethality tests using fish. Basal cytotoxicity data obtained with fish cell lines or fish primary cell cultures show a reasonable to good correlation with lethality data from acute toxicity tests, with the exception of compounds that exert a specific mode of toxic action. Basal cytotoxicity data from fish cell lines also correlate well with cytotoxicity data from mammalian cell lines. However, both the piscine and mammalian in vitro assays are clearly less sensitive than the fish test. Therefore, in vivo LC50 values (concentrations of the test compounds that are lethal to 50% of the fish in the experiment within 96 hours) currently cannot be predicted from in vitro values. This in vitro-in vivo difference in sensitivity appears to be true for both fish cell lines and mammalian cell lines. Given the good in vitro-in vivo correlation in toxicity ranking, together with the clear-cut difference in sensitivity, the role of cytotoxicity assays in a tiered alternative testing strategy could be in priority setting in relation to toxic hazard and in the toxicity classification of chemicals and environmental samples.
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Affiliation(s)
- Helmut Segner
- Centre for Fish and Wildlife Health, University of Bern, P.O. Box 8466, 3001 Bern, Switzerland.
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Rehberger K, Kropf C, Segner H. In vitro or not in vitro: a short journey through a long history. ENVIRONMENTAL SCIENCES EUROPE 2018; 30:23. [PMID: 30009109 PMCID: PMC6018605 DOI: 10.1186/s12302-018-0151-3] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2018] [Accepted: 06/06/2018] [Indexed: 05/19/2023]
Abstract
The aim of ecotoxicology is to study toxic effects on constituents of ecosystems, with the protection goal being populations and communities rather than individual organisms. In this ecosystem perspective, the use of in vitro methodologies measuring cellular and subcellular endpoints at a first glance appears to be odd. Nevertheless, more recently in vitro approaches gained momentum in ecotoxicology. In this article, we will discuss important application domains of in vitro methods in ecotoxicology. One area is the use of in vitro assays to replace, reduce, and refine (3R) in vivo tests. Research in this field has focused mainly on the use of in vitro cytotoxicity assays with fish cells as non-animal alternative to the in vivo lethality test with fish and on in vitro biotransformation assays as part of an alternative testing strategy for bioaccumulation testing with fish. Lessons learned from this research include the importance of a critical evaluation of the sensitivity, specificity and exposure conditions of in vitro assays, as well as the availability of appropriate in vitro-in vivo extrapolation models. In addition to this classical 3R application, other application domains of in vitro assays in ecotoxicology include the screening and prioritization of chemical hazards, the categorization of chemicals according to their modes of action and the provision of mechanistic information for the pathway-based prediction of adverse outcomes. The applications discussed in this essay may highlight the potential of in vitro technologies to enhance the environmental hazard assessment of single chemicals and complex mixtures at a reduced need of animal testing.
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Affiliation(s)
- Kristina Rehberger
- Centre for Fish and Wildlife Health, Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, P O Box, 3001 Bern, Switzerland
| | - Christian Kropf
- Centre for Fish and Wildlife Health, Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, P O Box, 3001 Bern, Switzerland
| | - Helmut Segner
- Centre for Fish and Wildlife Health, Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, P O Box, 3001 Bern, Switzerland
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12
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Costa SR, Velasques RR, Rovani MT, Souza MM, Sandrini JZ. Comparison of the Base Excision Repair Activity in Liver Cell Models of Zebrafish (Danio rerio). Zebrafish 2018; 15:107-111. [DOI: 10.1089/zeb.2017.1507] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Simone Rutz Costa
- Programa de Pós-Graduação em Ciências Fisiológicas, Universidade Federal do Rio Grande-FURG, Rio Grande, Brazil
| | - Robson Rabelo Velasques
- Programa de Pós-Graduação em Ciências Fisiológicas, Universidade Federal do Rio Grande-FURG, Rio Grande, Brazil
| | - Monique Tomazele Rovani
- Programa de Pós-Graduação em Ciências Fisiológicas, Universidade Federal do Rio Grande-FURG, Rio Grande, Brazil
| | - Marta Marques Souza
- Programa de Pós-Graduação em Ciências Fisiológicas, Universidade Federal do Rio Grande-FURG, Rio Grande, Brazil
- Instituto de Ciências Biológicas, Universidade Federal do Rio Grande-FURG, Rio Grande, Brazil
| | - Juliana Zomer Sandrini
- Programa de Pós-Graduação em Ciências Fisiológicas, Universidade Federal do Rio Grande-FURG, Rio Grande, Brazil
- Instituto de Ciências Biológicas, Universidade Federal do Rio Grande-FURG, Rio Grande, Brazil
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13
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Petersen K, Hultman MT, Tollefsen KE. Primary hepatocytes from Arctic char (Salvelinus alpinus) as a relevant Arctic in vitro model for screening contaminants and environmental extracts. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2017; 187:141-152. [PMID: 28411469 DOI: 10.1016/j.aquatox.2017.03.023] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Revised: 03/24/2017] [Accepted: 03/31/2017] [Indexed: 06/07/2023]
Abstract
Contaminants find their way to the Arctic through long-range atmospheric transport, transport via ocean currents, and through increased anthropogenic activity. Some of the typical pollutants reaching the Arctic (PAHs, PCBs) are known to induce cytochrome P450 1a (CYP1A) protein expression and ethoxyresorufin-O-deethylase (EROD) activity through the aryl hydrocarbon receptor (AhR). In addition, some endocrine disrupting chemicals (EDCs) such as estrogen mimics (xenoestrogens) have been documented in Arctic areas and they may interfere with natural sexual development and reproduction. In vitro assays that are capable of detecting effects of such pollutants, covering multiple endpoints, are generally based on mammalian or temperate species and there are currently no well-characterized cell-based in vitro assays for effect assessment from Arctic fish species. The present study aimed to develop a high-throughput and multi-endpoint in vitro assay from Arctic char (Salvelinus alpinus) to provide a non-animal (alternative) testing method for an ecologically relevant Arctic species. A method for isolation and exposure of primary hepatocytes from Arctic char for studying the toxic effects and mode of action (MoA) of pollutants was applied and validated. The multi-versatility of the bioassay was assessed by classical biomarker responses such as cell viability (membrane integrity and metabolic activity), phase I detoxification (CYP1A protein expression, EROD activity) and estrogen receptor (ER) mediated vitellogenin (Vtg) protein expression using a selection of model compounds, environmental pollutants and an environmental extract containing a complex mixture of pollutants. Primary hepatocytes from Arctic char were successfully isolated and culture conditions optimized to identify the most optimal assay conditions for covering multiple endpoints. The hepatocytes responded with concentration-dependent responses to all of the model compounds, most of the environmental pollutants and the environmental sample tested. The bioassay response and sensitivity of the hepatocytes from Arctic char differed slightly from closely related salmonid species, thus highlighting the need for developing in vitro assays relevant for Arctic species. The present multi-endpoint in vitro assay offer a highly versatile tool to screen potential effects of pollutants and complex samples relevant for Arctic exposure scenarios.
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Affiliation(s)
- Karina Petersen
- Norwegian Institute for Water Research, Gaustadalleen 21, N-0349 Oslo, Norway.
| | - Maria T Hultman
- Norwegian Institute for Water Research, Gaustadalleen 21, N-0349 Oslo, Norway
| | - Knut Erik Tollefsen
- Norwegian Institute for Water Research, Gaustadalleen 21, N-0349 Oslo, Norway; Norwegian University of Life Sciences (NMBU), Post Box 5003, N-1432 Ås, Norway.
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14
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Rodd AL, Messier NJ, Vaslet CA, Kane AB. A 3D fish liver model for aquatic toxicology: Morphological changes and Cyp1a induction in PLHC-1 microtissues after repeated benzo(a)pyrene exposures. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2017; 186:134-144. [PMID: 28282620 PMCID: PMC5436724 DOI: 10.1016/j.aquatox.2017.02.018] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2016] [Revised: 02/15/2017] [Accepted: 02/16/2017] [Indexed: 05/12/2023]
Abstract
To identify the potential environmental impacts of aquatic pollutants, rapid and sensitive screening tools are needed to assess adaptive and toxic responses. This study characterizes a novel fish liver microtissue model, produced with the cell line PLHC-1, as an in vitro aquatic toxicity testing platform. These 3D microtissues remain viable and stable throughout the 8-day testing period and relative to 2D monolayers, show increased basal expression of the xenobiotic metabolizing enzyme cytochrome P450 1A (Cyp1a). To evaluate pulsed, low-dose exposures at environmentally relevant concentrations, microtissue responsiveness to the model toxicant benzo(a)pyrene was assessed after single and repeated exposures for determination of both immediate and persistent effects. Significant induction of Cyp1a gene and protein expression was detected after a single 24h exposure to as little as 1nM benzo(a)pyrene, and after a 24h recovery period, Cyp1a expression declined in a dose-dependent manner. However, cell death continued to increase during the recovery period and alterations in microtissue architecture occurred at higher concentrations. To evaluate a pulsed or repeated exposure scenario, microtissues were exposed to benzo(a)pyrene, allowed to recover, then exposed a second time for 24h. Following pre-exposure to benzo(a)pyrene, cyp1a expression remained equally inducible and the pattern and level of Cyp1a protein response to a second exposure were comparable. However, pre-exposure to 1μM or 5μM of benzo(a)pyrene resulted in increased cell death, greater disruption of microtissue architecture, and alterations in cell morphology. Together, this study demonstrates the capabilities of this PLHC-1 microtissue model for sensitive assessment of liver toxicants over time and following single and repeated exposures.
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Affiliation(s)
- April L Rodd
- Department of Pathology & Laboratory Medicine, Brown University, Providence, RI 02912, USA.
| | - Norma J Messier
- Department of Pathology & Laboratory Medicine, Brown University, Providence, RI 02912, USA
| | - Charles A Vaslet
- Department of Pathology & Laboratory Medicine, Brown University, Providence, RI 02912, USA
| | - Agnes B Kane
- Department of Pathology & Laboratory Medicine, Brown University, Providence, RI 02912, USA
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15
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Bermejo-Nogales A, Connolly M, Rosenkranz P, Fernández-Cruz ML, Navas JM. Negligible cytotoxicity induced by different titanium dioxide nanoparticles in fish cell lines. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2017; 138:309-319. [PMID: 28062079 DOI: 10.1016/j.ecoenv.2016.12.039] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Revised: 10/28/2016] [Accepted: 12/30/2016] [Indexed: 06/06/2023]
Abstract
Titanium dioxide nanoparticles (TiO2-NPs) have a wide number of applications in cosmetic, solar and paint industries due to their photocatalyst and ultraviolet blocking properties. The continuous increase in the production of TiO2-NPs enhances the risk for this manufactured nanomaterial to enter water bodies through treated effluents or agricultural amendments. TiO2-NPs have shown very low toxicity in a number of aquatic organisms. However, there are no conclusive data about their deleterious effects and on their possible mechanisms of toxic action. At this level, in vitro cell culture systems are a useful tool to gain insight about processes underlying the toxicity of a wide variety of substances, including nanomaterials. Differences in the physiology of different taxa make advisable the use of cells coming from the taxon of interest, but collecting data from a variety of cellular types allows a better understanding of the studied processes. Taking all this into account, the aim of the present study was to assess the toxicity of three types of TiO2-NP, rutile hydrophobic (NM-103), rutile hydrophilic (NM-104) and rutile-anatase (NM-105), obtained from the EU Joint Research Centre (JRC) repository, using various fish cell lines (RTG-2, PLHC-1, RTH-149, RTL-W1) and rainbow trout primary hepatocytes. For comparative purposes, the effect of different dispersion protocols, end-point assays and extended exposure time was studied in a fish cell line (RTG-2) and in the rat hepatoma cell line (H4IIE). TiO2-NPs dispersions showed a variable degree of aggregation in cell culture media. Disruption of mitochondrial metabolic activity, plasma membrane integrity and lysosome function was not detected in any cell line after exposure to TiO2-NPs at any time and concentration ranges tested. These results are indicative of a low toxicity of the TiO2-NPs tested and show the usefulness of fish cells maintained in vitro as high throughput screening methods that can facilitate further testing in the framework of integrated testing strategies.
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Affiliation(s)
- Azucena Bermejo-Nogales
- Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Departamento de Medio Ambiente, Ambiente, Carretera de la Coruña, Km 7.5, 28040 Madrid, Spain.
| | - Mona Connolly
- Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Departamento de Medio Ambiente, Ambiente, Carretera de la Coruña, Km 7.5, 28040 Madrid, Spain; Heriott-Watt University, School of Life Sciences, Edinburgh, UK.
| | - Philipp Rosenkranz
- Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Departamento de Medio Ambiente, Ambiente, Carretera de la Coruña, Km 7.5, 28040 Madrid, Spain.
| | - María-Luisa Fernández-Cruz
- Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Departamento de Medio Ambiente, Ambiente, Carretera de la Coruña, Km 7.5, 28040 Madrid, Spain.
| | - José M Navas
- Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Departamento de Medio Ambiente, Ambiente, Carretera de la Coruña, Km 7.5, 28040 Madrid, Spain.
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16
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Bischof I, Köster J, Segner H, Schlechtriem C. Hepatocytes as in vitro test system to investigate metabolite patterns of pesticides in farmed rainbow trout and common carp: Comparison between in vivo and in vitro and across species. Comp Biochem Physiol C Toxicol Pharmacol 2016; 187:62-73. [PMID: 27185525 DOI: 10.1016/j.cbpc.2016.05.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/24/2016] [Revised: 05/10/2016] [Accepted: 05/11/2016] [Indexed: 12/31/2022]
Abstract
In vitro tools using isolated primary fish hepatocytes have been proposed as a useful model to study the hepatic metabolism of xenobiotics in fish. In order to evaluate the potential of in vitro fish hepatocyte assays to provide information on in vivo metabolite patterns of pesticides in farmed fish, the present study addressed the following questions: Are in vitro and in vivo metabolite patterns comparable? Are species specific differences of metabolite patterns in vivo reflected in vitro? Are metabolite patterns obtained from cryopreserved hepatocytes comparable to those from freshly isolated cells? Rainbow trout and common carp were dosed orally with feed containing the pesticide methoxychlor (MXC) for 14days. In parallel, in vitro incubations using suspensions of freshly isolated or cryopreserved primary hepatocytes obtained from both species were performed. In vivo and in vitro samples were analyzed by thin-layer chromatography with authentic standards supported by HPLC-MS. Comparable metabolite patterns from a qualitative perspective were observed in liver in vivo and in hepatocyte suspensions in vitro. Species specific differences of MXC metabolite patterns observed between rainbow trout and common carp in vivo were well reflected by experiments with hepatocytes in vitro. Finally, cryopreserved hepatocytes produced comparable metabolite patterns to freshly isolated cells. The results of this study indicate that the in vitro hepatocyte assay could be used to identify metabolite patterns of pesticides in farmed fish and could thus serve as a valuable tool to support in vivo studies as required for pesticides approval according to the EU regulation 1107.
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Affiliation(s)
- Ina Bischof
- Fraunhofer Institute for Molecular Biology and Applied Ecology, Auf dem Aberg 1, 57392 Schmallenberg, Germany; Centre for Fish and Wildlife Health, University of Bern, Switzerland.
| | - Jessica Köster
- Fraunhofer Institute for Molecular Biology and Applied Ecology, Auf dem Aberg 1, 57392 Schmallenberg, Germany
| | - Helmut Segner
- Centre for Fish and Wildlife Health, University of Bern, Switzerland
| | - Christian Schlechtriem
- Fraunhofer Institute for Molecular Biology and Applied Ecology, Auf dem Aberg 1, 57392 Schmallenberg, Germany
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17
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Lucie M, Weiwei D, Stéphane P, Sandrine SC. The five glucose-6-phosphatase paralogous genes are differentially regulated by insulin alone or combined with high level of amino acids and/or glucose in trout hepatocytes. Mol Biol Rep 2016; 43:207-11. [PMID: 26896939 DOI: 10.1007/s11033-016-3962-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Accepted: 02/18/2016] [Indexed: 01/04/2023]
Abstract
A recent analysis of the newly sequenced rainbow trout (Oncorhynchus mykiss) genome suggested that duplicated gluconeogenic g6pc paralogues, fixed in this genome after the salmonid-specific 4th whole genome duplication, may have a role in the setting up of the glucose-intolerant phenotype in this carnivorous species. This should be due to the sub- or neo-functionalization of their regulation. In the present short communication we thus addressed the question of the regulation of these genes by insulin, hormone involved in the glucose homeostasis, and its interaction with glucose and amino acids in vitro. The stimulation of trout hepatocytes with insulin revealed an atypical up-regulation of g6pcb2 ohnologues and confirmed the sub- or neo-functionalization of the five g6pc genes at least at the regulatory level. Intriguingly, when hepatocytes were cultured with high levels of glucose and/or AAs in presence of insulin, most of the g6pc paralogues were up-regulated. It strongly suggested a cross-talk between insulin and nutrients for the regulation of these genes. Moreover these results strengthened the idea that g6pc duplicated genes may significantly contribute to the setting up of the glucose-intolerant phenotype in trout via their atypical regulation by insulin alone or in interaction with nutrients. These findings open new perspectives to better understand in vivo glucose-intolerant phenotype in trout fed a high carbohydrate diet.
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Affiliation(s)
- Marandel Lucie
- Institut National de la Recherche Agronomique (INRA), Nutrition, Metabolism, Aquaculture (UR1067), 64310, Saint-Pée-sur-Nivelle, France.
| | - Dai Weiwei
- Institut National de la Recherche Agronomique (INRA), Nutrition, Metabolism, Aquaculture (UR1067), 64310, Saint-Pée-sur-Nivelle, France.
| | - Panserat Stéphane
- Institut National de la Recherche Agronomique (INRA), Nutrition, Metabolism, Aquaculture (UR1067), 64310, Saint-Pée-sur-Nivelle, France.
| | - Skiba-Cassy Sandrine
- Institut National de la Recherche Agronomique (INRA), Nutrition, Metabolism, Aquaculture (UR1067), 64310, Saint-Pée-sur-Nivelle, France.
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18
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Dai W, Panserat S, Kaushik S, Terrier F, Plagnes-Juan E, Seiliez I, Skiba-Cassy S. Hepatic fatty acid biosynthesis is more responsive to protein than carbohydrate in rainbow trout during acute stimulations. Am J Physiol Regul Integr Comp Physiol 2016; 310:R74-86. [DOI: 10.1152/ajpregu.00281.2015] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Accepted: 10/20/2015] [Indexed: 12/21/2022]
Abstract
The link between dietary carbohydrate/protein and de novo lipogenesis (DNL) remains debatable in carnivorous fish. We aimed to evaluate and compare the response of hepatic lipogenic gene expression to dietary carbohydrate intake/glucose and dietary protein intake/amino acids (AAs) during acute stimulations using both in vivo and in vitro approaches. For the in vivo trial, three different diets and a controlled-feeding method were employed to supply fixed amount of dietary protein or carbohydrate in a single meal; for the in vitro trial, primary hepatocytes were stimulated with a low or high level of glucose (3 mM or 20 mM) and a low or high level of AAs (one-fold or four-fold concentrated AAs). In vitro data showed that a high level of AAs upregulated the expression of enzymes involved in DNL [fatty acid synthase (FAS) and ATP citrate lyase (ACLY)], lipid bioconversion [elongation of very long chain fatty acids like-5 (Elovl5), Elovl2, Δ6 fatty acyl desaturase (D6D) and stearoyl-CoA desaturase-1 (SCD1)], NADPH production [glucose-6-phosphate dehydrogenase (G6PDH) and malic enzyme (ME)], and transcriptional factor sterol regulatory element binding protein 1-like, while a high level of glucose only elevated the expression of ME. Data in trout liver also showed that high dietary protein intake induced higher lipogenic gene expression (FAS, ACLY, and Elovl2) regardless of dietary carbohydrate intake, while high carbohydrate intake markedly suppressed the expression of acetyl-CoA carboxylase (ACC) and Elovl5. Overall, we conclude that, unlike rodents or humans, hepatic fatty acid biosynthetic gene expression in rainbow trout is more responsive to dietary protein intake/AAs than dietary carbohydrate intake/glucose during acute stimulations. This discrepancy probably represents one important physiological and metabolic difference between carnivores and omnivores.
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Affiliation(s)
- Weiwei Dai
- Institut National de la Recherche Agronomique, UR 1067 Nutrition Métabolisme, Aquaculture, Aquapôle, CD 918, Saint-Pée-sur-Nivelle, France
| | - Stéphane Panserat
- Institut National de la Recherche Agronomique, UR 1067 Nutrition Métabolisme, Aquaculture, Aquapôle, CD 918, Saint-Pée-sur-Nivelle, France
| | - Sadasivam Kaushik
- Institut National de la Recherche Agronomique, UR 1067 Nutrition Métabolisme, Aquaculture, Aquapôle, CD 918, Saint-Pée-sur-Nivelle, France
| | - Frédéric Terrier
- Institut National de la Recherche Agronomique, UR 1067 Nutrition Métabolisme, Aquaculture, Aquapôle, CD 918, Saint-Pée-sur-Nivelle, France
| | - Elisabeth Plagnes-Juan
- Institut National de la Recherche Agronomique, UR 1067 Nutrition Métabolisme, Aquaculture, Aquapôle, CD 918, Saint-Pée-sur-Nivelle, France
| | - Iban Seiliez
- Institut National de la Recherche Agronomique, UR 1067 Nutrition Métabolisme, Aquaculture, Aquapôle, CD 918, Saint-Pée-sur-Nivelle, France
| | - Sandrine Skiba-Cassy
- Institut National de la Recherche Agronomique, UR 1067 Nutrition Métabolisme, Aquaculture, Aquapôle, CD 918, Saint-Pée-sur-Nivelle, France
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19
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Hultman MT, Song Y, Tollefsen KE. 17α-Ethinylestradiol (EE2) effect on global gene expression in primary rainbow trout (Oncorhynchus mykiss) hepatocytes. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2015; 169:90-104. [PMID: 26519835 DOI: 10.1016/j.aquatox.2015.10.004] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2015] [Revised: 10/06/2015] [Accepted: 10/06/2015] [Indexed: 06/05/2023]
Abstract
The potential impact of endocrine disrupting chemicals (EDCs) in the aquatic environment has driven the development of screening assays to evaluate the estrogenic properties of chemicals and their effects on aquatic organisms such as fish. However, obtaining full concentration-response relationships in animal (in vivo) exposure studies are laborious, costly and unethical, hence a need for developing feasible alternative (non-animal) methods. Use of in vitro bioassays such as primary fish hepatocytes, which retain many of the native properties of the liver, has been proposed for in vitro screening of estrogen receptor (ER) agonists and antagonists. The aim of present study was to characterize the molecular mode of action (MoA) of the ER agonist 17α-ethinylestradiol (EE2) in primary rainbow trout (Oncorhynchus mykiss) hepatocytes. A custom designed salmonid 60,000-feature (60k) oligonucleotide microarray was used to characterize the potential MoAs after 48h exposure to EE2. The microarray analysis revealed several concentration-dependent gene expression alterations including classical estrogen sensitive biomarker gene expression (e.g. estrogen receptor α, vitellogenin, zona radiata). Gene Ontology (GO) analysis displayed transcriptional changes suggesting interference of cellular growth, fatty acid and lipid metabolism potentially mediated through the estrogen receptor (ER), which were proposed to be associated with modulation of genes involved in endocrine function and reproduction. Pathway analysis supported the identified GOs and revealed modulation of additional genes associated with apoptosis and cholesterol biosynthesis. Differentially expressed genes (DEGs) related to impaired lipid metabolism (e.g. peroxisome proliferator-activated receptor α and γ), growth (e.g. insulin growth factor protein 1), phase I and II biotransformation (e.g. cytochrome P450 1A, sulfotransferase, UDP-glucuronosyltransferase and glutathione S-transferase) provided additional insight into the MoA of EE2 in primary fish hepatocytes. Results from the present study suggest that biotransformation, estrogen receptor-mediated responses, lipid homeostasis, growth and cancer/apoptosis in primary fish hepatocytes may be altered after short-term exposure to ER-agonists such as EE2. In many cases the observed changes were similar to those reported for estrogen-exposed fish in vivo. In conclusion, global transcriptional analysis demonstrated that EE2 affected a number of toxicologically relevant pathways associated with an estrogenic MoA in the rainbow trout hepatocytes.
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Affiliation(s)
- Maria T Hultman
- Norwegian Institute for Water Research (NIVA), Section of Ecotoxicology and Risk Assessment, Gaustadalléen 21, N-0349 Oslo, Norway; Faculty of Environmental Science & Technology, Department for Environmental Sciences, Norwegian University of Life Sciences (NMBU), Post box 5003, N-1432 Ås, Norway.
| | - You Song
- Norwegian Institute for Water Research (NIVA), Section of Ecotoxicology and Risk Assessment, Gaustadalléen 21, N-0349 Oslo, Norway
| | - Knut Erik Tollefsen
- Norwegian Institute for Water Research (NIVA), Section of Ecotoxicology and Risk Assessment, Gaustadalléen 21, N-0349 Oslo, Norway; Faculty of Environmental Science & Technology, Department for Environmental Sciences, Norwegian University of Life Sciences (NMBU), Post box 5003, N-1432 Ås, Norway
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20
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Fay KA, Nabb DL, Mingoia RT, Bischof I, Nichols JW, Segner H, Johanning K, Han X. Determination of Metabolic Stability Using Cryopreserved Hepatocytes from Rainbow Trout (
Oncorhynchus mykiss
). ACTA ACUST UNITED AC 2015; 65:4.42.1-4.42.29. [DOI: 10.1002/0471140856.tx0442s65] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Kellie A. Fay
- ORD/NHEERL/Mid‐Continent Ecology Division, U.S. EPA Duluth Minnesota
| | - Diane L. Nabb
- DuPont Haskell Global Centers for Health and Environmental Sciences Newark Delaware
| | - Robert T. Mingoia
- DuPont Haskell Global Centers for Health and Environmental Sciences Newark Delaware
| | - Ina Bischof
- Centre for Fish and Wildlife Health, University of Bern Bern Switzerland
- Fraunhofer Institute for Molecular Biology and Applied Ecology Schmallenberg Germany
| | - John W. Nichols
- ORD/NHEERL/Mid‐Continent Ecology Division, U.S. EPA Duluth Minnesota
| | - Helmut Segner
- Centre for Fish and Wildlife Health, University of Bern Bern Switzerland
| | - Karla Johanning
- KJ Scientific LCC, Texas Life Sciences Collaboration Center Georgetown Texas
| | - Xing Han
- DuPont Haskell Global Centers for Health and Environmental Sciences Newark Delaware
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21
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Du X, Crawford DL, Oleksiak MF. Effects of Anthropogenic Pollution on the Oxidative Phosphorylation Pathway of Hepatocytes from Natural Populations of Fundulus heteroclitus. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2015; 165:231-40. [PMID: 26122720 DOI: 10.1016/j.aquatox.2015.06.009] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2015] [Revised: 06/11/2015] [Accepted: 06/12/2015] [Indexed: 05/24/2023]
Abstract
Persistent organic pollutants (POPs), including polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs), potentially target mitochondria and cause toxicity. We compared the effects of POPs on mitochondrial respiration by measuring oxidative phosphorylation (OxPhos) metabolism in hepatocytes isolated from lab-depurated Fundulus heteroclitus from a Superfund site contaminated with PAHs (Elizabeth River VA, USA) relative to OxPhos metabolism in individuals from a relatively clean, reference population (King's Creek VA, USA). In individuals from the polluted Elizabeth River population, OxPhos metabolism displayed lower LEAK and lower activities in complex III, complex IV, and E State, but higher activity in complex I compared to individuals from the reference King's Creek population. To test the supposition that these differences were due to or related to the chronic PAH contamination history of the Elizabeth River population, we compared the OxPhos functions of undosed individuals from the polluted and reference populations to individuals from these populations dosed with a PAH {benzo [α] pyrene (BaP)} or a PCB {PCB126 (3,3',4,4',5-pentachlorobiphenyl)}, respectively. Exposure to PAH or PCB affected OxPhos in the reference King's Creek population but had no detectable effects on the polluted Elizabeth River population. Thus, PAH exposure significantly increased LEAK, and exposure to PCB126 significantly decreased State 3, E state and complex I activity in the reference King's Creek population. These data strongly implicate an evolved tolerance in the Elizabeth River fish where dosed fish are not affected by PAH exposure and undosed fish show decreased LEAK and increased State 3 and E state.
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Affiliation(s)
- Xiao Du
- Rosenstiel School of Marine and Atmospheric Science, 4600 Rickenbacker Causeway, University of Miami, Miami, FL 33149, USA
| | - Douglas L Crawford
- Rosenstiel School of Marine and Atmospheric Science, 4600 Rickenbacker Causeway, University of Miami, Miami, FL 33149, USA
| | - Marjorie F Oleksiak
- Rosenstiel School of Marine and Atmospheric Science, 4600 Rickenbacker Causeway, University of Miami, Miami, FL 33149, USA.
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22
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Connolly M, Fernandez-Cruz ML, Quesada-Garcia A, Alte L, Segner H, Navas JM. Comparative Cytotoxicity Study of Silver Nanoparticles (AgNPs) in a Variety of Rainbow Trout Cell Lines (RTL-W1, RTH-149, RTG-2) and Primary Hepatocytes. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2015; 12:5386-405. [PMID: 26006119 PMCID: PMC4454974 DOI: 10.3390/ijerph120505386] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/26/2015] [Revised: 04/30/2015] [Accepted: 05/12/2015] [Indexed: 01/30/2023]
Abstract
Among all classes of nanomaterials, silver nanoparticles (AgNPs) have potentially an important ecotoxicological impact, especially in freshwater environments. Fish are particularly susceptible to the toxic effects of silver ions and, with knowledge gaps regarding the contribution of dissolution and unique particle effects to AgNP toxicity, they represent a group of vulnerable organisms. Using cell lines (RTL-W1, RTH-149, RTG-2) and primary hepatocytes of rainbow trout (Oncorhynchus mykiss) as in vitro test systems, we assessed the cytotoxicity of the representative AgNP, NM-300K, and AgNO3 as an Ag+ ion source. Lack of AgNP interference with the cytotoxicity assays (AlamarBlue, CFDA-AM, NRU assay) and their simultaneous application point to the compatibility and usefulness of such a battery of assays. The RTH-149 and RTL-W1 liver cell lines exhibited similar sensitivity as primary hepatocytes towards AgNP toxicity. Leibovitz’s L-15 culture medium composition (high amino acid content) had an important influence on the behaviour and toxicity of AgNPs towards the RTL-W1 cell line. The obtained results demonstrate that, with careful consideration, such an in vitro approach can provide valuable toxicological data to be used in an integrated testing strategy for NM-300K risk assessment.
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Affiliation(s)
- Mona Connolly
- Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Carretera de la Coruña Km 7.5, E-38040 Madrid, Spain.
| | - Maria-Luisa Fernandez-Cruz
- Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Carretera de la Coruña Km 7.5, E-38040 Madrid, Spain.
| | - Alba Quesada-Garcia
- Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Carretera de la Coruña Km 7.5, E-38040 Madrid, Spain.
| | - Luis Alte
- Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Carretera de la Coruña Km 7.5, E-38040 Madrid, Spain.
| | - Helmut Segner
- Faculty of Vetsuisse, Centre for Fish and Wildlife Health, University of Berne, Länggassstr. 122, Postfach 8466, CH-3001 Bern, Switzerland,.
| | - Jose M Navas
- Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Carretera de la Coruña Km 7.5, E-38040 Madrid, Spain.
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23
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Uchea C, Owen SF, Chipman JK. Functional xenobiotic metabolism and efflux transporters in trout hepatocyte spheroid cultures. Toxicol Res (Camb) 2015; 4:494-507. [PMID: 25893091 PMCID: PMC4384106 DOI: 10.1039/c4tx00160e] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2014] [Accepted: 01/28/2015] [Indexed: 12/12/2022] Open
Abstract
Prediction of xenobiotic fate in fish is important for the regulatory assessment of chemicals under current legislation. Trout hepatocyte spheroids are a promising in vitro model for this assessment. In this investigation, the gene expression and function for xenobiotic metabolism and cellular efflux were characterised. Using fluorescence, transport and real time PCR analysis, the expression and functionality of a variety of genes related to xenobiotic metabolism and drug efflux were assessed in a range of trout hepatocyte culture preparations. Significantly greater levels of expression of genes involved in xenobiotic metabolism and efflux were measured in spheroids (which have been shown to remain viable in excess of 30 days), compared to hepatocytes cultured using conventional suspension and monolayer culture techniques. A transient decline in the expression of genes related to both xenobiotic metabolism and transport was determined during spheroid development, with a subsequent recovery in older spheroids. The most mature spheroids also exhibited an expression profile most comparable to that reported in vivo. Functionality of efflux transporters in spheroids was also demonstrated using fluorescent markers and specific inhibitors. In conclusion, the more physiologically relevant architecture in spheroid cultures provides a high functional integrity in relation to xenobiotic metabolism and efflux. Together with the enhanced gene expression and longevity of the model, hepatocytes in spheroid culture may prove to be an accurate alternative model to study the mechanisms of these processes in fish liver and provide an assay to determine the bioaccumulation potential of environmental contaminants.
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Affiliation(s)
- Chibuzor Uchea
- University of Birmingham , School of Biosciences , Birmingham , B15 2TT , UK ; AstraZeneca , Alderley Park , Macclesfield , Cheshire , SK10 4TF , UK .
| | - Stewart F Owen
- AstraZeneca , Alderley Park , Macclesfield , Cheshire , SK10 4TF , UK .
| | - J Kevin Chipman
- University of Birmingham , School of Biosciences , Birmingham , B15 2TT , UK
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Gröner F, Ziková A, Kloas W. Effects of the pharmaceuticals diclofenac and metoprolol on gene expression levels of enzymes of biotransformation, excretion pathways and estrogenicity in primary hepatocytes of Nile tilapia (Oreochromis niloticus). Comp Biochem Physiol C Toxicol Pharmacol 2015; 167:51-7. [PMID: 25236869 DOI: 10.1016/j.cbpc.2014.09.003] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Revised: 09/03/2014] [Accepted: 09/03/2014] [Indexed: 11/22/2022]
Abstract
The expression levels of key enzymes of the xenobiotic metabolism and excretion pathways concerning biotransformation phases I (cytochrome P4501A), II (glutathione S-transferase) and III (multidrug resistance protein) and of the estrogenic biomarker vitellogenin (vtg) were investigated in primary hepatocytes isolated from male Nile tilapia (Oreochromis niloticus) after exposure to diclofenac and metoprolol, two pharmaceuticals prevalent in the aquatic environment worldwide. The lowest test concentration (4×10(-9) M) was chosen to reflect an environmentally relevant exposure situation. Furthermore concentration dependent effects were investigated. Therefore a series of concentrations higher than the environmentally relevant range were used (10- and 100-fold). Diclofenac significantly induced all chosen biomarkers already at the environmentally relevant concentration indicating that biotransformation and elimination occur via the pathways under investigation. Estrogenic potential of this substance was demonstrated by VTG up-regulation as well. Metoprolol was either less effective than diclofenac or metabolized using different pathways. Key enzymes of the xenobiotic metabolism were less (CYP1A, GST) or not (MDRP) induced and a mild increase in vtg mRNA was detected only for 4×10(-8) M. No concentration-dependency for metoprolol was found.
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Affiliation(s)
- Frederike Gröner
- Department of Ecophysiology and Aquaculture, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 301, 12587 Berlin, Germany.
| | - Andrea Ziková
- Department of Ecophysiology and Aquaculture, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 301, 12587 Berlin, Germany
| | - Werner Kloas
- Department of Ecophysiology and Aquaculture, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 301, 12587 Berlin, Germany; Department of Endocrinology, Institute of Biology, Humboldt University, Invalidenstr. 42, 10099 Berlin, Germany
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25
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Möller AM, Korytář T, Köllner B, Schmidt-Posthaus H, Segner H. The teleostean liver as an immunological organ: Intrahepatic immune cells (IHICs) in healthy and benzo[a]pyrene challenged rainbow trout (Oncorhynchus mykiss). DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2014; 46:518-529. [PMID: 24718255 DOI: 10.1016/j.dci.2014.03.020] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2014] [Revised: 03/28/2014] [Accepted: 03/28/2014] [Indexed: 06/03/2023]
Abstract
The existence of a resident population of intrahepatic immune cells (IHICs) is well documented for mammalian vertebrates, however, it is uncertain whether IHICs are present in the liver of teleostean fish. In the present study we investigated whether trout liver contains an IHIC population, and if so, what the relative cellular composition of this population is. The results provide clear evidence for the existence of an IHIC population in trout liver, which constitutes 15-29% of the non-hepatocytes in the liver, and with a cellular composition different to that of the blood leukocyte population. We also analyzed the response of IHICs to a non-infectious liver challenge with the hepatotoxic and immunotoxic chemical, benzo[a]pyrene (BaP). Juvenile trout were treated with BaP (25 or 100mg/kgbw) at levels sufficient to induce the molecular pathway of BaP metabolism while not causing pathological and inflammatory liver changes. The IHIC population responded to the BaP treatments in a way that differed from the responses of the leukocyte populations in trout blood and spleen, suggesting that IHICs are an independently regulated immune cell population.
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Affiliation(s)
- Anja-Maria Möller
- Centre for Fish and Wildlife Health, University of Bern, Länggassstrasse 122, CH-3012 Bern, Switzerland; Institute of Immunology, Federal Research Institute for Animal Health, Friedrich-Loeffler-Institut, Südufer 10, 17493 Greifswald-Insel Riems, Germany.
| | - Tomáš Korytář
- Institute of Immunology, Federal Research Institute for Animal Health, Friedrich-Loeffler-Institut, Südufer 10, 17493 Greifswald-Insel Riems, Germany.
| | - Bernd Köllner
- Institute of Immunology, Federal Research Institute for Animal Health, Friedrich-Loeffler-Institut, Südufer 10, 17493 Greifswald-Insel Riems, Germany.
| | - Heike Schmidt-Posthaus
- Centre for Fish and Wildlife Health, University of Bern, Länggassstrasse 122, CH-3012 Bern, Switzerland.
| | - Helmut Segner
- Centre for Fish and Wildlife Health, University of Bern, Länggassstrasse 122, CH-3012 Bern, Switzerland.
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26
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Eide M, Karlsen OA, Kryvi H, Olsvik PA, Goksøyr A. Precision-cut liver slices of Atlantic cod (Gadus morhua): an in vitro system for studying the effects of environmental contaminants. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2014; 153:110-115. [PMID: 24268426 DOI: 10.1016/j.aquatox.2013.10.027] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2013] [Revised: 10/17/2013] [Accepted: 10/27/2013] [Indexed: 06/02/2023]
Abstract
The Atlantic cod (Gadus morhua) is an economically important species commonly consumed by humans. The widespread distribution of cod in the North Atlantic Ocean makes it vulnerable to effluents from human activities, such as coastal industries and offshore petroleum exploration. It has been demonstrated that many effluents have adverse effects on cod reproduction and health, e.g. by disrupting endocrine signaling pathways. The liver, expressing important components of the biotransformation and the endocrine system, is one of the main target organs. Thus, reliable and reproducible in vitro systems of the liver are important for studying effects of environmental contaminants. The aim of this study was to investigate precision-cut liver slices (PCLS) as an alternative in vitro system for toxicological studies of the Atlantic cod liver. Slices of 8 mm in diameter and 250 μm thickness were prepared and cultivated from immature cod. Several analyses to measure the liver slice viability were performed: enzyme assays, histology, and morphometric analysis, all confirming cell viability for up to 72 h in culture. The liver slices were also exposed to two well-known model environmental contaminants, β-naphthoflavone (BNF) and 17α-ethynylestradiol (EE2), representing established agonists for the aryl hydrocarbon receptor (AHR) and the estrogen receptor (ER), respectively. The results showed increased transcription of the target genes cytochrome P450 1A (CYP1A) and vitellogenin (VTG), both well-established biomarkers for exposure of fish to the selected compounds. In conclusion, PCLS is a promising in vitro system for toxicological studies of cod liver cells. The liver slices are viable in culture for several days and respond to environmental contaminants in a dose- and time-specific manner.
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Affiliation(s)
- M Eide
- Department of Biology, University of Bergen, Bergen, Norway.
| | - O A Karlsen
- Department of Biology, University of Bergen, Bergen, Norway
| | - H Kryvi
- Department of Biology, University of Bergen, Bergen, Norway
| | - P A Olsvik
- National Institute of Nutrition and Seafood Research, Bergen, Norway
| | - A Goksøyr
- Department of Biology, University of Bergen, Bergen, Norway
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27
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Fay KA, Mingoia RT, Goeritz I, Nabb DL, Hoffman AD, Ferrell BD, Peterson HM, Nichols JW, Segner H, Han X. Intra- and interlaboratory reliability of a cryopreserved trout hepatocyte assay for the prediction of chemical bioaccumulation potential. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2014; 48:8170-8. [PMID: 24941452 DOI: 10.1021/es500952a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Measured rates of intrinsic clearance determined using cryopreserved trout hepatocytes can be extrapolated to the whole animal as a means of improving modeled bioaccumulation predictions for fish. To date, however, the intra- and interlaboratory reliability of this procedure has not been determined. In the present study, three laboratories determined in vitro intrinsic clearance of six reference compounds (benzo[a]pyrene, 4-nonylphenol, di-tert-butyl phenol, fenthion, methoxychlor and o-terphenyl) by conducting substrate depletion experiments with cryopreserved trout hepatocytes from a single source. O-terphenyl was excluded from the final analysis due to nonfirst-order depletion kinetics and significant loss from denatured controls. For the other five compounds, intralaboratory variability (% CV) in measured in vitro intrinsic clearance values ranged from 4.1 to 30%, while interlaboratory variability ranged from 27 to 61%. Predicted bioconcentration factors based on in vitro clearance values exhibited a reduced level of interlaboratory variability (5.3-38% CV). The results of this study demonstrate that cryopreserved trout hepatocytes can be used to reliably obtain in vitro intrinsic clearance of xenobiotics, which provides support for the application of this in vitro method in a weight-of-evidence approach to chemical bioaccumulation assessment.
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Affiliation(s)
- Kellie A Fay
- U.S. EPA, ORD, NHEERL, Mid-Continent Ecology Division, Duluth, Minnesota 55804, United States
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28
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da Silva CA, de Morais ECP, Costa MDM, Ribas JLC, Guiloski IC, Ramsdorf WA, Zanata SM, Cestari MM, Ribeiro CAO, Magalhães VF, Trudeau VL, de Assis HCS. Saxitoxins induce cytotoxicity, genotoxicity and oxidative stress in teleost neurons in vitro. Toxicon 2014; 86:8-15. [PMID: 24813331 DOI: 10.1016/j.toxicon.2014.04.016] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2014] [Revised: 04/25/2014] [Accepted: 04/29/2014] [Indexed: 11/16/2022]
Abstract
The aim of this study was establish a protocol for isolation and primary culture of neurons from tropical freshwater fish species Hoplias malabaricus for assessment of the effects of neurotoxic substances as saxitoxins (STXs). Cells from brain of H. malabaricus were treated with different concentrations of trypsin, dispase and papain for tissue dissociation. Cells type was separated by cellular gradient and basic fibroblast growth factor (bFGF) supplement nutrition media were added. The dissociated cells were plated with medium and different STXs concentrations and the toxic cellular effects such as oxidative stress, neurotoxicity, and genotoxicity and apoptosis process were evaluated. Cultures treated with bFGF showed the greatest adherence, survival and cellular development. STXs increased specific activity of glutathione peroxidase and lipoperoxidation levels, were cytotoxic and genotoxic indicated by the comet assay. Although the STXs effects due the blockage of sodium channels is reported to be reversible, the time exposure and concentration of STXs suggested cellular injuries which can lead to neuropathology. The establishment of primary neuronal culture protocol enables new applications for neurotoxicological assessments.
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Affiliation(s)
- Cesar Aparecido da Silva
- Ecology and Conservation Post-graduate Program, Federal University of Paraná, 81531-990, P.O. Box 19031, Curitiba, Paraná, Brazil
| | | | - Michele Dietrich Moura Costa
- Department of Basic Pathology, Federal University of Paraná, 81531-990, P.O. Box 19031, Curitiba, Paraná, Brazil
| | - João Luiz Coelho Ribas
- Department of Pharmacology, Federal University of Paraná, 81531-990, P.O. Box 19031, Curitiba, Paraná, Brazil
| | - Izonete Cristina Guiloski
- Department of Pharmacology, Federal University of Paraná, 81531-990, P.O. Box 19031, Curitiba, Paraná, Brazil
| | - Wanessa A Ramsdorf
- Department of Genetics, Federal University of Paraná, 81531-990, P.O. Box 19031, Curitiba, Paraná, Brazil
| | - Silvio Marques Zanata
- Department of Basic Pathology, Federal University of Paraná, 81531-990, P.O. Box 19031, Curitiba, Paraná, Brazil
| | - Marta M Cestari
- Department of Genetics, Federal University of Paraná, 81531-990, P.O. Box 19031, Curitiba, Paraná, Brazil
| | | | - Valéria F Magalhães
- Federal University of Rio de Janeiro, Institute of Biophysics Carlos Chagas Filho, 21941-902 Rio de Janeiro, RJ, Brazil
| | - Vance L Trudeau
- Department of Biology, University of Ottawa, K1N 6N5 Ottawa, Ontario, Canada
| | - Helena C Silva de Assis
- Department of Pharmacology, Federal University of Paraná, 81531-990, P.O. Box 19031, Curitiba, Paraná, Brazil.
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Ferreira M, Santos P, Rey-Salgueiro L, Zaja R, Reis-Henriques MA, Smital T. The first demonstration of CYP1A and the ABC protein(s) gene expression and activity in European seabass (Dicentrarchus labrax) primary hepatocytes. CHEMOSPHERE 2014; 100:152-159. [PMID: 24342362 DOI: 10.1016/j.chemosphere.2013.11.051] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2013] [Revised: 11/20/2013] [Accepted: 11/23/2013] [Indexed: 06/03/2023]
Abstract
Primary hepatocytes are a model for studying various effects of different xenobiotics, including detoxification strategies. In this study we have isolated and cultured European seabass (Dicentrarchus labrax) primary hepatocytes and assessed gene transcription and activity of CYP1A (phase I of cellular detoxification) and ABCC1 and ABCC2 (phase III) transport proteins after exposure to benzo(a)pyrene (BaP). A dose dependent increase in Abcc2 and Cyp1a mRNA transcripts was observed in seabass primary hepatocytes upon exposure to BaP. The activity of ABC proteins, as key mediators of the multixenobiotic resistance (MXR), was further confirmed by assessing the accumulation of the model fluorescence substrate rhodamine 123 in the absence and presence of model inhibitors. A weak interaction between BaP and ABC proteins was observed. CYP1A dependent ethoxyresorufin-O-deeethylase (EROD) activity was significantly induced by the presence of BaP. After the 24h exposure period only 10% of the initial BaP was present in the incubation medium, clearly demonstrating biotransformation potential of primary seabass hepatocytes. Furthermore, the presence of the 3-hydroxybenzo(a)pyrene, a BaP metabolite, in the medium implies its active efflux. In conclusion, we showed that seabass primary hepatocytes do express important elements of the cellular detoxification machinery and may be a useful in vitro model for studying basic cellular detoxification mechanisms and their interaction with environmental contaminants.
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Affiliation(s)
- Marta Ferreira
- CIIMAR/CIMAR - Interdisciplinary Centre of Marine and Environmental Research, Laboratory of Environmental Toxicology, University of Porto, Rua dos Bragas, 289, 4050-123 Porto, Portugal.
| | - Pedro Santos
- CIIMAR/CIMAR - Interdisciplinary Centre of Marine and Environmental Research, Laboratory of Environmental Toxicology, University of Porto, Rua dos Bragas, 289, 4050-123 Porto, Portugal; ICBAS/UP - Institute of Biomedical Sciences Abel Salazar, University of Porto, Largo Professor Abel Salazar, 2, 4099-003 Porto, Portugal; Faculty of Sciences, University of Porto, Rua do Campo Alegre s/n, 4169-007 Porto, Portugal
| | - Ledicia Rey-Salgueiro
- CIIMAR/CIMAR - Interdisciplinary Centre of Marine and Environmental Research, Laboratory of Environmental Toxicology, University of Porto, Rua dos Bragas, 289, 4050-123 Porto, Portugal
| | - Roko Zaja
- Laboratory for Molecular Ecotoxicology, Division for Marine and Environmental Research, Rudjer Boskovic Institute, Bijenicka 54, 10000 Zagreb, Croatia
| | - Maria Armanda Reis-Henriques
- CIIMAR/CIMAR - Interdisciplinary Centre of Marine and Environmental Research, Laboratory of Environmental Toxicology, University of Porto, Rua dos Bragas, 289, 4050-123 Porto, Portugal
| | - Tvrtko Smital
- Laboratory for Molecular Ecotoxicology, Division for Marine and Environmental Research, Rudjer Boskovic Institute, Bijenicka 54, 10000 Zagreb, Croatia
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Bury NR, Schnell S, Hogstrand C. Gill cell culture systems as models for aquatic environmental monitoring. J Exp Biol 2014; 217:639-50. [DOI: 10.1242/jeb.095430] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A vast number of chemicals require environmental safety assessments for market authorisation. To ensure acceptable water quality, effluents and natural waters are monitored for their potential harmful effects. Tests for market authorisation and environmental monitoring usually involve the use of large numbers of organisms and, for ethical, cost and logistic reasons, there is a drive to develop alternative methods that can predict toxicity to fish without the need to expose any animals. There is therefore a great interest in the potential to use cultured fish cells in chemical toxicity testing. This review summarises the advances made in the area and focuses in particular on a system of cultured fish gill cells grown into an epithelium that permits direct treatment with water samples.
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Affiliation(s)
- Nic R. Bury
- King's College London, Division of Diabetes and Nutritional Science, Franklin–Wilkins Building, 150 Stamford Street, London SE1 9NH, UK
| | - Sabine Schnell
- King's College London, Division of Diabetes and Nutritional Science, Franklin–Wilkins Building, 150 Stamford Street, London SE1 9NH, UK
| | - Christer Hogstrand
- King's College London, Division of Diabetes and Nutritional Science, Franklin–Wilkins Building, 150 Stamford Street, London SE1 9NH, UK
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31
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Eide M, Rusten M, Male R, Jensen KHM, Goksøyr A. A characterization of the ZFL cell line and primary hepatocytes as in vitro liver cell models for the zebrafish (Danio rerio). AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2014; 147:7-17. [PMID: 24355757 DOI: 10.1016/j.aquatox.2013.11.023] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2013] [Revised: 11/27/2013] [Accepted: 11/28/2013] [Indexed: 06/03/2023]
Abstract
The zebrafish (Danio rerio) is a widely used model species in biomedical research. The ZFL cell line, established from zebrafish liver, and freshly isolated primary hepatocytes from zebrafish have been used in several toxicological studies. However, no previous report has compared and characterized these two systems at the level of gene expression. The aim of this study was to evaluate the ZFL cell line in comparison to primary hepatocytes as in vitro models for studying effects of environmental contaminants in zebrafish liver. Using quantitative real-time PCR, the basal level and transcriptional induction potential of key genes involved in toxic responses in the ZFL cell line, primary hepatocytes and whole liver from zebrafish were compared. The study showed that the ZFL cells have lower levels of mRNA of most selected genes compared to zebrafish liver. The induced gene transcription following exposure to ligand was much lower in ZFL cells compared to zebrafish primary hepatocytes at the doses tested. Importantly, oestrogen receptor and vitellogenin genes showed low basal transcription and no induction response in the ZFL cell line. In conclusion, it appears that primary hepatocytes are well suited for studying environmental contaminants including xenoestrogens, but may show large sex-dependent differences in gene transcription. The ZFL cell line shows potential in toxicological studies involving the aryl hydrocarbon receptor pathway. However, low potential for transcriptional induction of genes in general should be expected, especially notable when studying estrogenic responses.
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Affiliation(s)
- Marta Eide
- Department of Biology, University of Bergen, Bergen, Norway.
| | - Marte Rusten
- Department of Molecular Biology, University of Bergen, Bergen, Norway
| | - Rune Male
- Department of Molecular Biology, University of Bergen, Bergen, Norway
| | | | - Anders Goksøyr
- Department of Biology, University of Bergen, Bergen, Norway
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Petersen K, Fetter E, Kah O, Brion F, Scholz S, Tollefsen KE. Transgenic (cyp19a1b-GFP) zebrafish embryos as a tool for assessing combined effects of oestrogenic chemicals. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2013; 138-139:88-97. [PMID: 23721851 DOI: 10.1016/j.aquatox.2013.05.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2012] [Revised: 04/22/2013] [Accepted: 05/01/2013] [Indexed: 06/02/2023]
Abstract
Endocrine disrupting chemicals and especially oestrogen receptor (ER) agonists have been extensively studied over the years due to their potential effects on sexual development and reproduction in vertebrates, notably fish. As ER agonists can exist as complex mixtures in the aquatic environment, evaluating the impact of combined exposure on oestrogenic effects has become increasingly important. Use of predictive models such as concentration addition (CA) and independent action (IA) has allowed assessment of combined estrogenic effects of complex multi-compound mixtures of ER agonists in various fish in vitro and in vivo experimental models. The present work makes use of a transgenic zebrafish strain, tg(cyp19a1b-GFP), which expresses the green fluorescent protein (GFP) under the control of the cyp19a1b (brain aromatase or aromatase B) gene to determine the oestrogenic potency of ER agonists alone or in mixtures. In these studies, tg(cyp19a1b-GFP) zebrafish embryos were exposed for four days (from one to five days post fertilization) to five different oestrogenic chemicals; 17α-ethinylestradiol (EE2), 17β-estradiol (E2), estrone (E1), bisphenol A (BPA) and 4-tert-octylphenol (OP), and three mixtures of up to four of these compounds. The mixture of BPA, OP and E2 was also tested with primary cultures of rainbow trout hepatocytes by analysing the ER-mediated induction of the oestrogenic biomarker vitellogenin in order to compare the performance of the two methods for assessing oestrogenic effects of complex mixtures. The three tested mixtures were predominantly acting in an additive manner on the expression of GFP. Additivity was indicated by the overlap of the 95% confidence interval of the concentration response curves for the observed data with the CA and IA prediction models, and model deviation ratios within a factor of two for a majority of the mixture concentrations. However, minor deviations determined as more than additive effects for the mixture of EE2, E1 and E2 and less than additive effects for the mixture of BPA, OP, EE2 and E1 were observed at the higher mixture concentrations tested. The successful prediction of additivity by CA and IA in tg(cyp19a1b-GFP) zebrafish embryos and deviations at high mixture concentrations seemed to correspond well to results obtained in the rainbow trout hepatocyte assay. The present results clearly show the usefulness of combining predictive modelling and use of in vitro bioassays for rapid screening of oestrogenic effects of complex mixtures and environmental samples.
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Affiliation(s)
- Karina Petersen
- Norwegian Institute for Water Research-NIVA, Gaustadalleen 21, N-0349 Oslo, Norway.
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33
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Malhão F, Urbatzka R, Navas J, Cruzeiro C, Monteiro R, Rocha E. Cytological, immunocytochemical, ultrastructural and growth characterization of the rainbow trout liver cell line RTL-W1. Tissue Cell 2013; 45:159-74. [DOI: 10.1016/j.tice.2012.10.006] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2012] [Revised: 10/25/2012] [Accepted: 10/27/2012] [Indexed: 12/22/2022]
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34
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Uchea C, Sarda S, Schulz-Utermoehl T, Owen S, Chipman KJ. In vitromodels of xenobiotic metabolism in trout for use in environmental bioaccumulation studies. Xenobiotica 2012; 43:421-31. [DOI: 10.3109/00498254.2012.730644] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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35
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Baron MG, Purcell WM, Jackson SK, Owen SF, Jha AN. Towards a more representative in vitro method for fish ecotoxicology: morphological and biochemical characterisation of three-dimensional spheroidal hepatocytes. ECOTOXICOLOGY (LONDON, ENGLAND) 2012; 21:2419-2429. [PMID: 22732941 DOI: 10.1007/s10646-012-0965-5] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 06/08/2012] [Indexed: 06/01/2023]
Abstract
The use of fish primary cells and cell lines offer an in vitro alternative for assessment of chemical toxicity and the evaluation of environmental samples in ecotoxicology. However, their uses are not without limitations such as short culture periods and loss of functionality, particularly with primary tissue. While three-dimensional (spheroid) technology is now established for in vitro mammalian toxicity studies, to date it has not been considered for environmental applications in a model aquatic species. In this study we report development of a reproducible six-well plate, gyratory-mediated method for rainbow trout (Oncorhynchus mykiss) hepatocyte spheroid culture and compare their functional and biochemical status with two-dimensional (2D) monolayer hepatocytes. Primary liver spheroid formation was divided into two stages, immature (1-5 days) and mature (≥6 days) according to size, shape and changes in functional and biochemical parameters (protein, glucose, albumin and lactate dehydrogenase). Mature spheroids retained the morphological characteristics (smooth outer surface, tight cell-cell contacts) previously described for mammalian spheroids as demonstrated by light and scanning electron microscopy. Glucose production and albumin synthesis were significantly higher in mature spheroids when compared to conventional 2D monolayer cultures (P < 0.01) and increased as spheroids matured (P < 0.01). Basal lactate dehydrogenase (LDH) leakage significantly decreased during spheroid formation and was significantly lower than 2D cultures (P < 0.01). It is therefore suggested that mature spheroids can maintain a high degree of functional, biochemical and morphological status over-time in culture that is superior to conventional 2D models and can provide realistic organotypic responses in vitro. Trout spheroids that take ~6-8 days to reach maturity would be suitable for use in acute toxicological tests and since it is possible to culture individual spheroids for over a month, there is potential for this work to lead towards in vitro bioaccumulation alternatives and to conduct high throughput screens of chronic exposure. This is an important step forward for developing alternative in vitro tools in future fish ecotoxicological studies.
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Affiliation(s)
- Matthew G Baron
- School of Biomedical and Biological Sciences, Plymouth University, Drake Circus, Plymouth, Devon, PL4 8AA, UK
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Wang Y, Aker WG, Hwang HM, Yedjou CG, Yu H, Tchounwou PB. A study of the mechanism of in vitro cytotoxicity of metal oxide nanoparticles using catfish primary hepatocytes and human HepG2 cells. THE SCIENCE OF THE TOTAL ENVIRONMENT 2011; 409:4753-62. [PMID: 21851965 PMCID: PMC3185176 DOI: 10.1016/j.scitotenv.2011.07.039] [Citation(s) in RCA: 105] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2011] [Revised: 06/24/2011] [Accepted: 07/17/2011] [Indexed: 04/13/2023]
Abstract
Nanoparticles (NPs), including nanometal oxides, are being used in diverse applications such as medicine, clothing, cosmetics and food. In order to promote the safe development of nanotechnology, it is essential to assess the potential adverse health consequences associated with human exposure. The liver is a target site for NP toxicity, due to NP accumulation within it after ingestion, inhalation or absorption. The toxicity of nano-ZnO, TiO(2), CuO and Co(3)O(4) was investigated using a primary culture of channel catfish hepatocytes and human HepG2 cells as in vitro model systems for assessing the impact of metal oxide NPs on human and environmental health. Some mechanisms of nanotoxicity were determined by using phase contrast inverted microscopy, 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assays, reactive oxygen species (ROS) assays, and flow cytometric assays. Nano-CuO and ZnO showed significant toxicity in both HepG2 cells and catfish primary hepatocytes. The results demonstrate that HepG2 cells are more sensitive than catfish primary hepatocytes to the toxicity of metal oxide NPs. The overall ranking of the toxicity of metal oxides to the test cells is as follows: TiO(2)<Co(3)O(4)<ZnO<CuO. The toxicity is due not only to ROS-induced cell death, but also to damages to cell and mitochondrial membranes.
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Affiliation(s)
- Yonggang Wang
- Department of Biology, Jackson State University, Jackson, MS, USA
| | - Winfred G. Aker
- Department of Biology, Jackson State University, Jackson, MS, USA
| | - Huey-min Hwang
- Department of Biology, Jackson State University, Jackson, MS, USA
- Corresponding author: Dr. Huey-Min Hwang, Address: Jackson State University, 1400 Lynch St., Box 18540, Jackson, MS 39217, , Telephone number: 1-601-9792595, Fax: 1-601-9796856
| | | | - Hongtao Yu
- Department of Chemistry and Biochemistry, Jackson State University, Jackson, MS, USA
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Cellular responses of Prochilodus lineatus hepatocytes after cylindrospermopsin exposure. Toxicol In Vitro 2011; 25:1493-500. [DOI: 10.1016/j.tiv.2011.05.010] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2011] [Revised: 05/05/2011] [Accepted: 05/07/2011] [Indexed: 11/24/2022]
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Schweizer N, Kummer U, Hercht H, Braunbeck T. Amplitude-encoded calcium oscillations in fish cells. Biophys Chem 2011; 159:294-302. [PMID: 21908094 DOI: 10.1016/j.bpc.2011.08.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2011] [Accepted: 08/09/2011] [Indexed: 01/29/2023]
Abstract
The reaction of intracellular Ca(2+) to different agonist stimuli in primary hepatocytes from rainbow trout (Oncorhynchus mykiss) as well as the permanent fish cell line RTL-W1 was investigated systematically. In addition to "classical" agonists such as phenylephrine and ATP, model environmental toxicants like 4-nitrophenol and 3,4-dichloroaniline were used to elucidate possible interactions between toxic effects and Ca(2+) signaling. We report Ca(2+) oscillations in response to several stimuli in RTL-W1 cells and to a lesser extent in primary hepatocytes. Moreover, these Ca(2+) oscillations are amplitude-encoded in contrast to their mammalian counterpart. Bioinformatics and computational analysis were employed to identify key players of Ca(2+) signaling in fish and to determine likely causes for the experimentally observed differences between the Ca(2+) dynamics in fish cells compared to those in mammalian liver cells.
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Affiliation(s)
- N Schweizer
- Aquatic Ecology and Toxicology Group, Center of Organismic Studies, University of Heidelberg, Im Neuenheimer Feld 504, D-69120 Heidelberg, Germany.
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Lansard M, Panserat S, Plagnes-Juan E, Dias K, Seiliez I, Skiba-Cassy S. L-leucine, L-methionine, and L-lysine are involved in the regulation of intermediary metabolism-related gene expression in rainbow trout hepatocytes. J Nutr 2011; 141:75-80. [PMID: 21106925 DOI: 10.3945/jn.110.124511] [Citation(s) in RCA: 95] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Using rainbow trout hepatocytes stimulated with l-leucine, l-methionine, or l-lysine in the presence or absence of bovine insulin, we investigated the ability of these amino acids to mimic the effects of a pool of amino acids on protein kinase B (Akt)/target of rapamycin (TOR) signaling pathways and expression of 6 genes known to be subjected to insulin and/or amino acid regulation [glucose-6-phosphatase (G6Pase), phosphoenolpyruvate carboxykinase (PEPCK), glucokinase (GK), pyruvate kinase (PK), fatty acid synthase (FAS), and serine dehydratase (SDH)]. Emphasis was placed on leucine, known to be a signaling molecule in mammals, and methionine and lysine that are essential amino acids limiting in plant-based diets for fish. In the presence of insulin, leucine (but not methionine or lysine) phosphorylated Akt and ribosomal protein S6 as previously observed with a pool of amino acids, suggesting that leucine might participate in the activation of the TOR pathway by amino acids in fish, as in mammals. G6Pase, PEPCK, GK, and SDH gene expression were higher in leucine-treated cells compared with control cells. Leucine combined with insulin reduced G6Pase gene expression by 90% and increased FAS gene expression > 4-fold compared with the control treatment. Methionine weakly decreased G6Pase, GK, and SDH gene expression and lysine weakly but significantly decreased the mRNA level of PEPCK. Thus, leucine regulated gluconeogenesis and lipogenesis, but not glycolysis, in the same way as a pool of amino acids. Methionine appeared to be involved in the regulation of specific genes, whereas lysine only had limited effects. These findings are particularly relevant regarding the involvement of amino acids in the regulation of metabolism-related gene expression.
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Affiliation(s)
- Marine Lansard
- INRA, UMR1067 Nutrition Aquaculture et Génomique, Pôle d'hydrobiologie, CD918, F-64310 St-Pée-sur-Nivelle, France
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40
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Gurcu B, Yildiz S, Koca YBG, Koca S. Investigation of Histopathological and Cytogenetic Effects of Heavy Metals Pollution on Cyprinus carpio (Linneaus, 1758) in the Gölmarmara Lake, Turkey. ACTA ACUST UNITED AC 2010. [DOI: 10.3923/javaa.2010.798.808] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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41
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Lansard M, Panserat S, Plagnes-Juan E, Seiliez I, Skiba-Cassy S. Integration of insulin and amino acid signals that regulate hepatic metabolism-related gene expression in rainbow trout: role of TOR. Amino Acids 2010; 39:801-10. [PMID: 20213441 DOI: 10.1007/s00726-010-0533-3] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2009] [Accepted: 02/12/2010] [Indexed: 11/26/2022]
Abstract
Amino acids are considered to be regulators of metabolism in several species, and increasing importance has been accorded to the role of amino acids as signalling molecules regulating protein synthesis through the activation of the TOR transduction pathway. Using rainbow trout hepatocytes, we examined the ability of amino acids to regulate hepatic metabolism-related gene expression either alone or together with insulin, and the possible involvement of TOR. We demonstrated that amino acids alone regulate expression of several genes, including glucose-6-phosphatase, phosphoenolpyruvate carboxykinase, pyruvate kinase, 6-phospho-fructo-1-kinase and serine dehydratase, through an unknown molecular pathway that is independent of TOR activation. When insulin and amino acids were added together, a different pattern of regulation was observed that depended upon activation of the TOR pathway. This pattern included a dramatic up-regulation of lipogenic (fatty acid synthase, ATP-citrate lyase and sterol responsive element binding protein 1) and glycolytic (glucokinase, 6-phospho-fructo-1-kinase and pyruvate kinase) genes in a TOR-dependent manner. Regarding gluconeogenesis genes, only glucose-6-phosphatase was inhibited in a TOR-dependent manner by combination of insulin and amino acids and not by amino acids alone. This study is the first to demonstrate an important role of amino acids in combination with insulin in the molecular regulation of hepatic metabolism.
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Affiliation(s)
- Marine Lansard
- INRA, UMR1067 Nutrition Aquaculture et Génomique, Pôle d'hydrobiologie, CD918, 64310, St Pée-sur-Nivelle, France
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Sun L, Wen L, Shao X, Qian H, Jin Y, Liu W, Fu Z. Screening of chemicals with anti-estrogenic activity using in vitro and in vivo vitellogenin induction responses in zebrafish (Danio rerio). CHEMOSPHERE 2010; 78:793-799. [PMID: 20044124 DOI: 10.1016/j.chemosphere.2009.12.020] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2009] [Revised: 11/30/2009] [Accepted: 12/08/2009] [Indexed: 05/28/2023]
Abstract
Growing concern over possible adverse effects of endocrine-disrupting chemicals (EDCs) has driven the development of associated screening methods. The use of the vitellogenin (VTG) induction response in cultured teleost hepatocytes has been suggested as an in vitro screening assay for EDCs. However, current data do not sufficiently support this assay in the routine screening of chemicals. This study established and validated the use of primary cultured hepatocytes from zebrafish to screen chemicals for anti-estrogenic activities. Here we measured the transcript levels of selected hepatic estrogen-response genes, including vtg1, vtg2 and eralpha. Two model anti-estrogens, letrozole (LET), an aromatase inhibitor, and tamoxifen (TAM), a competitive estrogen receptor, were selected as representative chemicals. Additionally, comparisons between in vitro and in vivo assays were performed. As expected, there were concentration-dependent decreases for all three genes in the liver of female zebrafish exposed to LET in vivo for 72h. Similar responses were observed in males. As for in vitro testing, no discernable alterations in the gene transcripts were found in hepatocytes from males or females. In the case of TAM, exposure for 72h caused transcriptional reduction of hepatic estrogen-response genes in females in vivo and in vitro. In males, low concentrations of TAM resulted in increased expression of genes, while the expression decreased slightly at higher concentrations. Since these observations were in agreement with the pharmaceutical properties of two tested chemicals, the primary hepatocyte culture could be a promising tool for screening suspected EDCs.
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Affiliation(s)
- Liwei Sun
- Zhejiang University of Technology, Hangzhou, China
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43
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Mothersill C, Seymour C. Communication of ionising radiation signals – a tale of two fish. Int J Radiat Biol 2009; 85:909-19. [DOI: 10.3109/09553000903105452] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Schreiber R, Altenburger R, Paschke A, Schüürmann G, Küster E. A novel in vitro system for the determination of bioconcentration factors and the internal dose in zebrafish (Danio rerio) eggs. CHEMOSPHERE 2009; 77:928-933. [PMID: 19751945 DOI: 10.1016/j.chemosphere.2009.08.038] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2009] [Revised: 08/20/2009] [Accepted: 08/21/2009] [Indexed: 05/28/2023]
Abstract
In this study a novel in vitro approach for the determination of bioconcentration factors (BCF) and rate constants of lipophilic substances utilizing zebrafish (Danio rerio) eggs is presented. Zebrafish eggs were exposed in a static exposure regime towards a phenanthrene solution and concentration-time profiles of the exposure solutions were analyzed over time. The rate constants and the BCF were obtained from the concentration-time profile with the use of a least-square fit to a non-linear model. The determined BCF at steady-state (after 72h of exposure) for phenanthrene was estimated to be only about 1.5 times lower, than the respective BCF value reported in the literature. For uptake of solutes in zebrafish embryos, different transport processes are assumed as substances have to pass the chorion first and subsequently the membranes of the embryo. To investigate this, the period to steady-state concentration between zebrafish eggs and the ambient medium for phenanthrene under an agitated and non-agitated static exposure regime were compared. It was found, that this equilibrium was reached within a shorter time frame under agitation, resulting in higher rate constants. In addition to the determination of bioconcentration parameters, the internal phenanthrene dose in zebrafish eggs was determined by utilizing a biomimetic extraction method with water as transfer medium. Approximately 55% of the expected accumulated phenanthrene amount in zebrafish eggs could be re-extracted with a silicone rod extraction method. These results agree very well to what has been observed in abiotic systems. The scope of the proposed in vitro protocol to serve as an alternative for BCF determinations using established in vivo animal testing protocols with adult fish is discussed.
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Affiliation(s)
- René Schreiber
- UFZ-Helmholtz Centre for Environmental Research, Department Bioanalytical Ecotoxicology, Permoserstrasse 15, 04318 Leipzig, Germany.
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O'Dowd C, Mothersill CE, Cairns MT, Austin B, Lyng FM, McClean B, Talbot A, Murphy JEJ. Gene expression and enzyme activity of mitochondrial proteins in irradiated rainbow trout (Oncorhynchus mykiss, Walbaum) tissues in vitro. Radiat Res 2009; 171:464-73. [PMID: 19397447 DOI: 10.1667/rr1484.1] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
In recent years ethical, legislative and economic pressures have created a renewed interest in the development of alternatives to in vivo animal experiments. In vitro studies, particularly those using cell cultures, have been used increasingly as tools to assess the degree of toxicity associated with or present in particular environments. While cell cultures are useful to give relative toxicity values, genotypic and phenotypic integrity may be compromised in the continuous artificial environment they experience. In addition, cell cultures lack the complexity of functional organs and thus do not truly represent the effects that toxins exert on organ and organism functionality. In this study, ex vivo tissue cultures of rainbow trout gill, skin and spleen samples were analyzed for variation of expression in genes associated with oxidative phosphorylation after exposure to ionizing radiation. Significant radiation-induced changes in gene expression and enzyme activity associated with the mitochondrial oxidative phosphorylation process were identified. The tissues examined in this study demonstrated an exposure threshold at which radiation dose stimulates an alteration in the regulatory activity of mitochondrial-associated genes. Spleen tissues exposed to low levels of radiation (0.1 Gy) appeared most sensitive whereas skin tissues proved least sensitive, reacting only to higher doses (>1 Gy). We propose this investigative approach as an innovative alternative to in vivo studies because it identifies toxic exposure in vitro and could significantly reduce the number of live-animal toxicity tests required.
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Affiliation(s)
- Colm O'Dowd
- Radiation and Environmental Science Centre, Focas Institute, Dublin Institute of Technology, Dublin 8, Ireland.
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46
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Lammer E, Carr GJ, Wendler K, Rawlings JM, Belanger SE, Braunbeck T. Is the fish embryo toxicity test (FET) with the zebrafish (Danio rerio) a potential alternative for the fish acute toxicity test? Comp Biochem Physiol C Toxicol Pharmacol 2009; 149:196-209. [PMID: 19095081 DOI: 10.1016/j.cbpc.2008.11.006] [Citation(s) in RCA: 246] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/18/2008] [Revised: 11/17/2008] [Accepted: 11/17/2008] [Indexed: 11/19/2022]
Abstract
The fish acute toxicity test is a mandatory component in the base set of data requirements for ecotoxicity testing. The fish acute toxicity test is not compatible with most current animal welfare legislation because mortality is the primary endpoint and it is often hypothesized that fish suffer distress and perhaps pain. Animal alternative considerations have also been incorporated into new European REACH regulations through strong advocacy for the reduction of testing with live animals. One of the most promising alternative approaches to classical acute fish toxicity testing with live fish is the fish embryo toxicity (FET) test. The FET has been a mandatory component in routine whole effluent testing in Germany since 2005 and has already been standardized at the international level. In order to analyze the applicability of the FET also in chemical testing, a comparative re-evaluation of both fish and fish embryo toxicity data was carried out for a total of 143 substances, and statistical approaches were developed to evaluate the correlation between fish and fish embryo toxicity data. Results confirm that fish embryo tests are neither better nor worse than acute fish toxicity tests and provide strong scientific support for the FET as a surrogate for the acute fish toxicity test.
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Affiliation(s)
- E Lammer
- Aquatic Ecology and Toxicology Section, Department of Zoology, University of Heidelberg, Im Neuenheimer Feld 230, D-69120 Heidelberg, Germany
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Yanhong F, Chenghua H, Guofang L, Haibin Z. Optimization of the isolation and cultivation of Cyprinus carpio primary hepatocytes. Cytotechnology 2008; 58:85-92. [PMID: 19002769 DOI: 10.1007/s10616-008-9169-5] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2008] [Accepted: 09/18/2008] [Indexed: 11/28/2022] Open
Abstract
The aquatic environment is affected by numerous chemical contaminants. There is an increasing need to identify these chemicals and to evaluate their potential toxicity towards aquatic life. In this research we optimized techniques for primary cell culture of Cyprinus carpio hepatocytes as one adjunct model for ecotoxicological evaluation of the potential hazards of xenobiotics in the aquatic environment. In this study, Cyprinus carpio hepatocytes were isolated by mechanical separation, two-step collagenase perfusion, and pancreatin digestion. The hepatocytes or parenchymal cells could be separated from cell debris and from non-parenchymal cells by low-speed centrifugation (Percoll gradient centrifugation). The harvested hepatocytes were suspended in DMEM, M199 (cultured in 5% CO(2)), or L-15 (cultured without 5% CO(2)) medium then cultured at 17, 27, or 37 degrees C. Cell yield was counted by use of a hemocytometer, and the viability of the cells was assessed by use of the Trypan blue exclusion test. Results from these studies showed that the best method of isolation was pancreatin digestion (the cell yield was 2.7 x 10(8) per g (liver weight) and the viability was 98.4%) and the best medium was M199 (cultured in 5% CO(2)) or L-15 (cultured without 5% CO(2)). The optimum culture temperature was 27 degrees C. The primary hepatocytes culture of Cyprimus carpio grew well and satisfied requirements for most toxicological experiments in this condition.
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Affiliation(s)
- Fan Yanhong
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, 210095, China
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Su F, Zhang S, Li H, Liu G, Zhu L. In Vitro Cytotoxicity of the Organotin Compound Bis-(tri-n-butyltin)oxide to FG Cells. Toxicol Mech Methods 2008; 15:205-9. [DOI: 10.1080/15376520590945621] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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49
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Lamche G, Burkhardt-Holm P. Changes in apoptotic rate and cell viability in three fish epidermis cultures after exposure to nonylphenol and to a wastewater sample containing low concentrations of nonylphenol. Biomarkers 2008; 5:205-18. [DOI: 10.1080/135475000230361] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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50
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Plagnes-Juan E, Lansard M, Seiliez I, Médale F, Corraze G, Kaushik S, Panserat S, Skiba-Cassy S. Insulin regulates the expression of several metabolism-related genes in the liver and primary hepatocytes of rainbow trout (Oncorhynchus mykiss). J Exp Biol 2008; 211:2510-8. [DOI: 10.1242/jeb.018374] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
SUMMARYRainbow trout have a limited ability to use dietary carbohydrates efficiently and are considered to be glucose intolerant. Administration of carbohydrates results in persistent hyperglycemia and impairs post-prandial down regulation of gluconeogenesis despite normal insulin secretion. Since gluconeogenic genes are mainly under insulin control, we put forward the hypothesis that the transcriptional function of insulin as a whole may be impaired in the trout liver. In order to test this hypothesis, we performed intraperitoneal administration of bovine insulin to fasted rainbow trout and also subjected rainbow trout primary hepatocytes to insulin and/or glucose stimulation. We demonstrate that insulin was able to activate Akt, a key element in the insulin signaling pathway, and to regulate hepatic metabolism-related target genes both in vivo and in vitro. In the same way as in mammals, insulin decreased mRNA expression of gluconeogenic genes, including glucose 6-phosphatase (G6Pase),fructose 1,6-bisphosphatase (FBPase) and phosphoenolpyruvate carboxykinase (PEPCK). Insulin also limited the expression of carnitine palmitoyltransferase 1 (CPT1), a limiting enzyme of fatty acid β-oxidation. In vitro studies revealed that, as in mammals,glucose is an important regulator of some insulin target genes such as the glycolytic enzyme pyruvate kinase (PK) and the lipogenic enzyme fatty acid synthase (FAS). Interestingly, glucose also stimulates expression of glucokinase (GK), which has no equivalent in mammals. This study demonstrates that insulin possesses the intrinsic ability to regulate hepatic gene expression in rainbow trout, suggesting that other hormonal or metabolic factors may counteract some of the post-prandial actions of insulin.
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Affiliation(s)
- Elisabeth Plagnes-Juan
- INRA, UMR 1067 Nutrition Aquaculture and Génomique, Pôle d'hydrobiologie, CD 918, F-64310 Saint Pée-sur-Nivelle, France
| | - Marine Lansard
- INRA, UMR 1067 Nutrition Aquaculture and Génomique, Pôle d'hydrobiologie, CD 918, F-64310 Saint Pée-sur-Nivelle, France
| | - Iban Seiliez
- INRA, UMR 1067 Nutrition Aquaculture and Génomique, Pôle d'hydrobiologie, CD 918, F-64310 Saint Pée-sur-Nivelle, France
| | - Françoise Médale
- INRA, UMR 1067 Nutrition Aquaculture and Génomique, Pôle d'hydrobiologie, CD 918, F-64310 Saint Pée-sur-Nivelle, France
| | - Geneviève Corraze
- INRA, UMR 1067 Nutrition Aquaculture and Génomique, Pôle d'hydrobiologie, CD 918, F-64310 Saint Pée-sur-Nivelle, France
| | - Sadasivam Kaushik
- INRA, UMR 1067 Nutrition Aquaculture and Génomique, Pôle d'hydrobiologie, CD 918, F-64310 Saint Pée-sur-Nivelle, France
| | - Stéphane Panserat
- INRA, UMR 1067 Nutrition Aquaculture and Génomique, Pôle d'hydrobiologie, CD 918, F-64310 Saint Pée-sur-Nivelle, France
| | - Sandrine Skiba-Cassy
- INRA, UMR 1067 Nutrition Aquaculture and Génomique, Pôle d'hydrobiologie, CD 918, F-64310 Saint Pée-sur-Nivelle, France
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