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Adeogun AO, Ibor OR, Omiwole R, Chukwuka AV, Adewale AH, Kumuyi O, Arukwe A. Sex-differences in physiological and oxidative stress responses and heavy metals burden in the black jaw tilapia, Sarotherodon melanotheron from a tropical freshwater dam (Nigeria). Comp Biochem Physiol C Toxicol Pharmacol 2020; 229:108676. [PMID: 31783175 DOI: 10.1016/j.cbpc.2019.108676] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Revised: 11/21/2019] [Accepted: 11/23/2019] [Indexed: 01/11/2023]
Abstract
Black jaw tilapia (S. melanotheron) collected from Awba Dam (a watershed recipient of effluents from anthropogenic sources) was analysed for biological responses and trace metal burden with the aim of evaluating sex differences in these responses as a measure of environmental and biota health status. Concentration of heavy metals in fish muscle were analysed and showed values above WHO permissible limits for food. Physiological and biochemical responses (AST, ALT, ALP, total protein, albumin, globulin, BUN, Na+, K+ and creatinine) showed apparent sex-related differences. Among antioxidant defence system, mt mRNA and proteins showed higher levels in male S. melanotheron. CAT and GPx activities were significantly higher in males than in female fish, while the corresponding mRNA showed an opposite trend with higher transcripts in females than males. Further, while GST activity was apparently higher in females, GR activity was significantly higher in males, compared to female fish. ZnCu-sod mRNA showed significantly higher transcript levels in males, than females. Overall, the trend in these biological responses showed direct relationship with heavy metal concentrations in fish muscle and sediment. These relationships were revealed using PCA that produced significant groupings between physiological, biochemical and oxidative stress variables and muscle/sediment trace element burden. Specifically, the PCA biplots showed that these biological variables were due to the presence of the heavy metals in the dam. Therefore, the sex differences in the measured cellular adaptations of S. melanotheron in relation to the toxic conditions at the dam may have significant consequences on osmotic balance and cellular processes that regulate biochemical/antioxidant responses towards metabolism, behaviour, growth, reproduction and survival of Awba dam resident fish species. Thus, these responses should be compared to a suitable reference site to discern the extent of effects of the Awba Dam biota for monitoring purposes.
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Affiliation(s)
- Aina O Adeogun
- Department of Zoology, University of Ibadan, Ibadan, Nigeria
| | - Oju R Ibor
- Department of Zoology, University of Ibadan, Ibadan, Nigeria; Department of Zoology and Environmental Biology, University of Calabar, Calabar, Nigeria
| | | | | | | | | | - Augustine Arukwe
- Department of Biology, Norwegian University of Science and Technology (NTNU), Høgskoleringen 5, N-7491 Trondheim, Norway.
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Galland C, Dupuy C, Loizeau V, Danion M, Auffret M, Quiniou L, Laroche J, Pichereau V. Proteomic analysis of the European flounder Platichthys flesus response to experimental PAH-PCB contamination. MARINE POLLUTION BULLETIN 2015; 95:646-657. [PMID: 25912264 DOI: 10.1016/j.marpolbul.2015.04.038] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2014] [Revised: 03/28/2015] [Accepted: 04/15/2015] [Indexed: 06/04/2023]
Abstract
Platichthys flesus is often used as a sentinel species to monitor the estuarine water quality. In this study, we carried out an experimental contamination of fish using a PAHs/PCBs mixture, which was designed to mimic the concentrations found in the Seine estuary (C1) and 10 times these concentrations (C2). We used a proteomic approach to understand the molecular mechanisms implied in the response of P. flesus to these xenobiotics. We showed that 54 proteins were differentially accumulated in one or several conditions, which 34 displayed accumulation factors higher than two. 18 of these proteins were identified by MALDI TOF-TOF mass spectrometry. The results indicated the deregulation of oxidative stress- and glutathione metabolism-(GST, GPx) proteins as well as of several proteins belonging to the betaine demethylation pathway and the methionine cycle (BHMT, SHMT, SAHH), suggesting a role for these different pathways in the P. flesus response to chemical contamination.
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Affiliation(s)
- Claire Galland
- Université de Brest, Laboratoire des Sciences de l'Environnement Marin, LEMAR, UMR 6539 UBO/CNRS/IRD/Ifremer, Institut Universitaire Européen de la Mer (IUEM), 29280 Plouzané, France
| | - Célie Dupuy
- Université de Brest, Laboratoire des Sciences de l'Environnement Marin, LEMAR, UMR 6539 UBO/CNRS/IRD/Ifremer, Institut Universitaire Européen de la Mer (IUEM), 29280 Plouzané, France
| | - Véronique Loizeau
- Unité de Biogéochimie et Ecotoxicologie, IFREMER, Centre de Brest, BP70, 29280 Plouzané, France
| | - Morgane Danion
- ANSES, Agence nationale de sécurité sanitaire de l'alimentation et de l'environnement et du travail, site de Ploufragan-Plouzané-Technopole Brest Iroise, 29280 Plouzané, France
| | - Michel Auffret
- Université de Brest, Laboratoire des Sciences de l'Environnement Marin, LEMAR, UMR 6539 UBO/CNRS/IRD/Ifremer, Institut Universitaire Européen de la Mer (IUEM), 29280 Plouzané, France
| | - Louis Quiniou
- Université de Brest, Laboratoire des Sciences de l'Environnement Marin, LEMAR, UMR 6539 UBO/CNRS/IRD/Ifremer, Institut Universitaire Européen de la Mer (IUEM), 29280 Plouzané, France
| | - Jean Laroche
- Université de Brest, Laboratoire des Sciences de l'Environnement Marin, LEMAR, UMR 6539 UBO/CNRS/IRD/Ifremer, Institut Universitaire Européen de la Mer (IUEM), 29280 Plouzané, France
| | - Vianney Pichereau
- Université de Brest, Laboratoire des Sciences de l'Environnement Marin, LEMAR, UMR 6539 UBO/CNRS/IRD/Ifremer, Institut Universitaire Européen de la Mer (IUEM), 29280 Plouzané, France.
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Dabrowska H, Kopko O, Góra A, Waszak I, Walkusz-Miotk J. DNA damage, EROD activity, condition indices, and their linkages with contaminants in female flounder (Platichthys flesus) from the southern Baltic Sea. THE SCIENCE OF THE TOTAL ENVIRONMENT 2014; 496:488-498. [PMID: 25108251 DOI: 10.1016/j.scitotenv.2014.07.079] [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: 05/28/2014] [Revised: 07/11/2014] [Accepted: 07/20/2014] [Indexed: 06/03/2023]
Abstract
The Baltic Sea is considered as one of the marine areas most exposed to human impacts. A variety of chemical contaminants pose a threat to the habitants. Female flounder (Platichthys flesus) collected from three locations in the southern Baltic Sea in February 2010 were examined for biomarkers of exposure to genotoxic agents (DNA damage), AhR-active contaminants (ethoxyresorufin-O-deethylase, EROD activity), and somatic condition indexes. Organochlorine contaminants (OCs) and polycyclic aromatic hydrocarbon (PAH) metabolites were also measured in individual flounder to evaluate the biological responses in the context of contaminant burden. The genotoxicity, mildly exceeding a background level, revealed a significant relationship with mono-ortho substituted PCB (m-oPCB). Hepatic EROD activity was highly induced, yet showed no association with any of the contaminants measured other than biliary 1-OH pyrene normalized to pigment absorbance. Significant negative relationships were observed for lipid-based OCs and the gonado-somatic index (GSI) as well as for Ʃm-oPCB concentrations and the condition factor (CF). Principal component analysis (PCA) revealed an overall connection between somatic condition indexes, biomarkers, and chemical variables. Of the three locations, flounder inhabiting the Gulf of Gdańsk had the greatest contaminant burden and appeared to be the most affected. Of great concern is the reduced GSI in this location which can be attributed to the effects of contaminants and warrants further investigation.
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Affiliation(s)
- Henryka Dabrowska
- National Marine Fisheries Research Institute (NMFRI), Gdynia, Poland.
| | - Orest Kopko
- National Marine Fisheries Research Institute (NMFRI), Gdynia, Poland
| | - Agnieszka Góra
- National Marine Fisheries Research Institute (NMFRI), Gdynia, Poland
| | - Ilona Waszak
- National Marine Fisheries Research Institute (NMFRI), Gdynia, Poland
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Fonseca VF, Vasconcelos RP, França S, Serafim A, Lopes B, Company R, Bebianno MJ, Costa MJ, Cabral HN. Modeling fish biological responses to contaminants and natural variability in estuaries. MARINE ENVIRONMENTAL RESEARCH 2014; 96:45-55. [PMID: 24239066 DOI: 10.1016/j.marenvres.2013.10.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2013] [Revised: 10/15/2013] [Accepted: 10/25/2013] [Indexed: 06/02/2023]
Abstract
Understanding the factors that influence biological responses to contaminants has long been a major goal in marine environmental research. Seven estuarine sites along the Portuguese coast were sampled over a year, and different biological responses of Pomatoschistus microps and Atherina presbyter were determined: superoxide dismutase, catalase, ethoxyresorufin O-deethylase, glutathione S-transferase, metallothioneins, lipid peroxidation, RNA:DNA ratio and condition factor K. Generalized linear models (GLM) were developed for each biological variable per species in relation to sediment chemical characterization (metals and polycyclic aromatic hydrocarbons concentration) and environmental conditions (month, site, water temperature, salinity, depth and mud percentage in the sediment). GLM varied in explanatory power and in the set of predictor variables included in the models. Environmental factors were frequently selected as predictor variables. Individual metals concentration and sediment quality guidelines (integrating all metals) were the major contaminants explaining biological variability. Accordingly, models for metallothioneins and lipid peroxidation had highest explanatory power. Species-specific responses and dataset size were the basis of observed differences between GLM for the two species.
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Affiliation(s)
- V F Fonseca
- Centro de Oceanografia, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal.
| | - R P Vasconcelos
- Centro de Oceanografia, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
| | - S França
- Centro de Oceanografia, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
| | - A Serafim
- CIMA, Faculdade de Ciências do Mar e do Ambiente, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
| | - B Lopes
- CIMA, Faculdade de Ciências do Mar e do Ambiente, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
| | - R Company
- CIMA, Faculdade de Ciências do Mar e do Ambiente, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
| | - M J Bebianno
- CIMA, Faculdade de Ciências do Mar e do Ambiente, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
| | - M J Costa
- Centro de Oceanografia, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
| | - H N Cabral
- Centro de Oceanografia, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
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Kopecka-Pilarczyk J. Comparison of selected biomarkers in flounder (Platichthys flesus L.) from the Douro (Portugal) and Vistula (Poland) River estuaries. MARINE POLLUTION BULLETIN 2013; 73:70-77. [PMID: 23790463 DOI: 10.1016/j.marpolbul.2013.05.039] [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: 01/29/2013] [Revised: 05/13/2013] [Accepted: 05/16/2013] [Indexed: 06/02/2023]
Abstract
Sixty female flounder (Platichthys flesus) were collected in Autumn 2011, 15 from each of the following sampling sites: at the mouths of the Douro and Vistula Rivers, and at nearby open sea locations. The aim of the study was to assess several biomarkers in the two geographically distant regions. Hepatic EROD, GST, SOD, GPx, POx, LP; muscular AChE, BChE, LP; and branchial Na(+)/K(+)-ATPase were analysed. Moreover, BTI, PY, and three gross morphometric indices were calculated. The results were analysed with t-test, ANOVA, and PCA. Many differences were found between the open sea sites and the river mouths, mainly in Portugal, and between the two rivers. Salinity and pollution seem to be the main factors that affected the biomarkers. Effects of chronic pollution were observed at the river mouths, and an indication of a possible temporary exposure to pollutants was found at the open ocean site in Portugal.
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Dabrowska H, Kopko O, Turja R, Lehtonen KK, Góra A, Polak-Juszczak L, Warzocha J, Kholodkevich S. Sediment contaminants and contaminant levels and biomarkers in caged mussels (Mytilus trossulus) in the southern Baltic Sea. MARINE ENVIRONMENTAL RESEARCH 2013; 84:1-9. [PMID: 23195377 DOI: 10.1016/j.marenvres.2012.11.001] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2012] [Revised: 10/24/2012] [Accepted: 11/03/2012] [Indexed: 05/25/2023]
Abstract
Sediment from four southern Baltic Sea locations and caged mussels were analyzed for PCBs, organochlorine pesticides and metals (Cu, Zn, Cd, Pb, Hg). In mussels, which were additionally analyzed for 16 individual PAHs, a set of biomarker responses was measured to derive an integrated biomarker response (IBR) index as a part of integrative assessment of pollution in this area. Concentrations of PCBs, ΣDDT, and metals in sediment and mussels, greatest within the Gulf of Gdańsk area, showed decreasing gradients outwards from the Gulf. Sediment quality quotients (SQQs) and biological impact quotients (BIQs), reflecting on sediment- and mussel-accumulated contaminants' potential for biological effects, respectively, pointed out to the Gulf of Gdańsk to be of greatest concern among the examined sites. The IBRs corresponded poorly with the SQQs and BIQs, nevertheless, provided a line of evidence indicative of biological effects of contaminants to support more complex processes of environmental status assessment.
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Affiliation(s)
- Henryka Dabrowska
- National Marine Fisheries Research Institute, Kołłątaja 1, 81-332 Gdynia, Poland.
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Luk’yanova ON, Ireikina SA. Glutathione-S-transferase as a molecular biomarker of the state of marine organisms influenced by anthropogenic pressure. BIOL BULL+ 2011. [DOI: 10.1134/s1062359011040091] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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8
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Liao T, Yang F, Hui Y, Cheng W, Xiong G, Jin S, Wang J, Xu Y. Multi-endpoint toxicities on Chinese rare minnow (Gobiocypris rarus) fed with different diets. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2011; 31:70-78. [PMID: 21787671 DOI: 10.1016/j.etap.2010.09.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2009] [Revised: 07/30/2010] [Accepted: 09/04/2010] [Indexed: 05/31/2023]
Abstract
To compare the effects of three diets, rare minnow was fed with three diets from 30 dph to mature period. The activities of EROD, PROD, SOD and GST were measured in the WBHs as well as Vtg and TBARS concentrations at 60 dph. The rest fish were fed until adulthood for breeding studies. The group A served as the control group. It was found that Vtg, GST and EROD were significantly increased in the groups B and C, but SOD, TBARS and PROD levels were significantly increased only in the group C. In the adulthood, Vtg was significantly induced in the males in the group C. In generation F1, inhibition of CAT D activities and decrease of reproductive success were only found in pellet A group, but not in pellet B group. These findings indicate that the selection of diet is extremely important to assure veracity of the experiment results.
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Affiliation(s)
- Tao Liao
- Institute for Farm Products Processing and Nuclear-Agricultural Technology, Hubei Academy of Agricultural Sciences, Hubei Innovation Center of Agricultural Science and Technology, 8# Nanhu YaoYuan Road, Wuhan 430064, China
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Napierska D, Barsiene J, Mulkiewicz E, Podolska M, Rybakovas A. Biomarker responses in flounder Platichthys flesus from the Polish coastal area of the Baltic Sea and applications in biomonitoring. ECOTOXICOLOGY (LONDON, ENGLAND) 2009; 18:846-859. [PMID: 19495964 DOI: 10.1007/s10646-009-0328-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2008] [Accepted: 05/16/2009] [Indexed: 05/27/2023]
Abstract
The objective of this study was to investigate the pattern of enzymatic activities, environmental genotoxicity and cytotoxicity in flounder, Platichthys flesus, from the Polish coastal area of the Baltic Sea. Fish were sampled in different contaminated sites in the Gulf of Gdansk and in a reference area outside the gulf. The activities of acetylcholinesterase (AChE), glutathione S: -transferase (GST), catalase (CAT), alanine aminotransferase (ALT), aspartate aminotransferase (AST), creatine kinase (CK), lactate dehydrogenase (LDH), were studied, as well as the frequency of micronuclei, nuclear buds and fragmented-apoptotic cells. A higher mean activity level of muscular AChE and a lower activity level of hepatic GST were evident in samples taken from the reference site, relative to those found in the gulf. Modeled CAT activity (in both liver and gill tissue), blood plasma LDH and CK activities were all significantly higher in flounder collected at locations within the Gulf of Gdansk than at the reference site. No statistically significant alterations were observed in the activities of ALT and AST in the blood plasma of flounder in this study. Fish collected from a location at the mouth of the Vistula River showed the highest hepatic GST and CAT, the highest gill CAT activity, and the highest frequency of blood micronuclei, nuclear buds and fragmented-apoptotic cell inductions, as well as the lowest level of blood plasma CK. The present study confirms that compared to fish from the reference area, flounder from the Gulf of Gdansk clearly demonstrate a different enzyme activity, genotoxicity and cytotoxicity biomarker response pattern.
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Affiliation(s)
- Dorota Napierska
- Department of Fishery Oceanography and Marine Ecology, Sea Fisheries Institute, ul. Kollataja 1, 81-332, Gdynia, Poland.
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Pathiratne A, Chandrasekera LWHU, Pathiratne KAS. Use of biomarkers in Nile tilapia (Oreochromis niloticus) to assess the impacts of pollution in Bolgoda Lake, an urban water body in Sri Lanka. ENVIRONMENTAL MONITORING AND ASSESSMENT 2009; 156:361-375. [PMID: 18688734 DOI: 10.1007/s10661-008-0490-4] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2008] [Accepted: 07/24/2008] [Indexed: 05/26/2023]
Abstract
The present study reports the first analysis of water pollutants in Sri Lankan waters using a suite of biomarkers in Nile tilapia (Oreochromis niloticus) residing in Bolgoda Lake which receives urban, industrial and domestic wastes from multiple sources. The fish were collected from the lake in the dry period (April 2005) and wet periods (September 2005, October 2006) and the levels of biomarkers viz. hepatic ethoxyresorufin O-deethylase (EROD), glutathione S-transferase (GST), metallothioneins, biliary fluorescent aromatic compounds, brain and muscle cholinesterases (ChE) were compared with those of the laboratory reared control fish and the fish obtained from a less polluted water body, Bathalagoda reservoir (reference site). The results revealed that biomarker levels of the fish collected from the reference site were not significantly different from the controls. Hepatic EROD and GST activities in fish from Bolgoda Lake were induced 4.2-16.6 folds and 1.4-3.3 folds respectively compared with the control fish. Analysis of bile in the lake fish revealed recent uptake of naphthalene, pyrene and benzo(a)pyrene type polycyclic aromatic hydrocarbons (PAHs). The induction of EROD activities in feral fish reflects the exposure of fish to aryl hydrocarbon receptor agonists including PAHs present as pollutants in the Bolgoda Lake. Cholinesterase activity in the fish inhabiting one sampling site of Bolgoda Lake was lower (22-40% inhibition) than the activity measured in the control fish indicating the presence of anticholinesterase pollutants in the area. Hepatic metallothionein levels in the lake fish were higher (1.9-3.2 folds) in comparison to the controls indicating metal exposure. The results support the potential use of these biomarkers in Nile tilapia in assessing pollution in tropical water bodies.
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Affiliation(s)
- A Pathiratne
- Department of Zoology, Faculty of Science, University of Kelaniya, Kelaniya, Sri Lanka.
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Pesce SF, Cazenave J, Monferrán MV, Frede S, Wunderlin DA. Integrated survey on toxic effects of lindane on neotropical fish: Corydoras paleatus and Jenynsia multidentata. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2008; 156:775-783. [PMID: 18672322 DOI: 10.1016/j.envpol.2008.06.016] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2008] [Revised: 05/01/2008] [Accepted: 06/01/2008] [Indexed: 05/26/2023]
Abstract
We report the effect of lindane on fish experimentally exposed to lindane. Sublethal toxicity was assessed through (a) changes in histopathology; (b) the activity of GST in different organs; and (c) bioaccumulation in exposed fish. We present a survey on toxic effects of lindane at these three levels, proposing a sequence of dose-dependent effects. Physiological damage was reversible at lowest doses, but severe at the highest, including damage consistent with fibrosis in liver and karyolitic nucleus in brain of both studied species. Exposure of Jenynsia multidentata above 6 microg L(-1) caused activation a GST in liver and gills, followed by inhibition at 75 microg L(-1). Interestingly, the bioaccumulation rate was suddenly increased when GST was inhibited. Corydoras paleatus exposed to 6.0 microg L(-1) lindane did not present significant changes in GST activity; however, enzymatic inhibition was observed above 25 microg L(-1). The bioaccumulation rate in C. paleatus remained constant throughout the experiments. All in all, these results evidence that C. paleatus is more sensitive to lindane than J. multidentata.
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Affiliation(s)
- Silvia F Pesce
- Universidad Nacional de Córdoba-CONICET, Facultad de Ciencias Químicas, Dto. Bioquímica Clínica-CIBICI, Medina Allende esq., Haya de La Torre, Ciudad Universitaria, 5000 Córdoba, Argentina
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Molecular cloning and characterization of three sigma glutathione S-transferases from disk abalone (Haliotis discus discus). Comp Biochem Physiol B Biochem Mol Biol 2008; 151:257-67. [PMID: 18703158 DOI: 10.1016/j.cbpb.2008.07.012] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2008] [Revised: 07/14/2008] [Accepted: 07/14/2008] [Indexed: 11/21/2022]
Abstract
Three novel glutathione S-transferase (GSTs) cDNAs were cloned from a disk abalone (Haliotis dicus discus) cDNA library. Multiple alignment and phylogenetic analysis of three GSTs revealed that their closest relationship is with insect sigma GSTs. Recombinant GSTs were over-expressed in Escherichia coli as soluble fusion proteins. HdGSTS1 and HdGSTS2 were active towards 1-chloro-2,4-dinitrobenzene and ethacrynic acid, whereas HdGSTS3 appeared to be a non-enzymatic GST. Two active GSTs had similar optimum conditions for enzymatic reaction at pH 8.0 and temperature of approximately 30 degrees C. Molecular modeling analysis of three GSTs implicates their diverse active sites as being responsible for their different enzymatic features. Three sigma GSTs had significantly different expression patterns and levels of expression in abalone tissues, indicating their different functions. After 48 h-exposure to three model marine pollutants, only HdGSTS1 exhibited a proper inducibility, exhibiting its good biomarker potential for organic contaminants in marine environment. In contrast, the other two sigma GSTs revealed a minor role in the response of pollutants exposure.
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