1
|
Johnston CU, Kennedy CJ. Potency and mechanism of p-glycoprotein chemosensitizers in rainbow trout (Oncorhynchus mykiss) hepatocytes. FISH PHYSIOLOGY AND BIOCHEMISTRY 2024:10.1007/s10695-024-01376-9. [PMID: 39026113 DOI: 10.1007/s10695-024-01376-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Accepted: 07/02/2024] [Indexed: 07/20/2024]
Abstract
The membrane efflux transporter P-glycoprotein (P-gp, [ABCB1, MDR1]) exports a wide range of xenobiotic compounds, resulting in a continuous first line of defense against toxicant accumulation at basal expression levels, and contributing to the multixenobiotic resistance (MXR) phenotype at elevated expression levels. Relatively little information exists on P-gp inhibition in fish by chemosensitizers, compounds which lower toxicity thresholds for harmful P-gp substrates in complex mixtures. The effects of four known mammalian chemosensitizers (cyclosporin A [CsA], quinidine, valspodar [PSC833], and verapamil) on the P-gp-mediated transport of rhodamine 123 (R123) and cortisol in primary cultures of rainbow trout (Oncorhynchus mykiss) hepatocytes were examined. Competitive accumulation assays using 25 µM R123 or cortisol and varying concentrations of chemosensitizers (0-500 µM) were used. CsA, quinidine, and verapamil inhibited R123 export (IC50 values ± SE: 132 ± 60, 83.3 ± 27.2, and 43.2 ± 13.6 µM, respectively). CsA and valspodar inhibited cortisol export (IC50 values: 294 ± 106 and 92.2 ± 34.9 µM, respectively). In an ATP depletion assay, hepatocytes incubated with all four chemosensitizers resulted in lower free ATP concentrations, suggesting that they act via competitive inhibition. Chemosensitizers that inhibit MXR transporters are an important class of environmental pollutant, and these results show that rainbow trout transporters are inhibited by similar chemosensitizers (and mostly at similar concentrations) as seen in mammals and other fish species.
Collapse
Affiliation(s)
- Christina U Johnston
- Department of Biological Sciences, Simon Fraser University, 8888 University Drive Burnaby, British Columbia, Canada
| | - Christopher J Kennedy
- Department of Biological Sciences, Simon Fraser University, 8888 University Drive Burnaby, British Columbia, Canada.
| |
Collapse
|
2
|
Zhang W, Tang Y, Han Y, Zhou W, Shi W, Teng S, Ren P, Xiao G, Li S, Liu G. Microplastics boost the accumulation of tetrabromobisphenol A in a commercial clam and elevate corresponding food safety risks. CHEMOSPHERE 2022; 292:133499. [PMID: 34979205 DOI: 10.1016/j.chemosphere.2021.133499] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 11/30/2021] [Accepted: 12/30/2021] [Indexed: 06/14/2023]
Abstract
Marine bivalve molluscs are one of the primary seafood for consumers. Inhabiting terrigenous pollutant-convergent coastal areas and feeding through seawater filtration, edible bivalves are subjected to waterborne emerging pollutants such as microplastics (MPs) and tetrabromobisphenol A (TBBPA). Nevertheless, the potential risks of consuming MP-TBBPA contaminated seafood are still largely unknown. With that, accumulation of TBBPA with and without the presence of MPs in a commercial bivalve species, blood clam (Tegillarca granosa), was determined in the present study. Meanwhile, corresponding target hazard quotients (THQs) as well as margins of exposure (MoEs) were estimated to evaluate the potential health risks for clam consumers. Furthermore, the impacts of pollutants accumulation on the detoxification process and energy supply were analysed. The data obtained demonstrated that MPs aggravate the accumulation of TBBPA in clams, leading to elevated potential food safety risks (indicated by higher THQ values and lower MoE values) for consumers. In addition, the in vivo contents of CYP1A1 and UDP-glucuronosyltransferase, the enzymatic activity of glutathione-S-transferase, and the expression levels of five detoxification-related genes were all dramatically suppressed by MP-TBBPA. Furthermore, clams exposed to MP-TBBPA had significantly lower adenosine triphosphate contents and lower pyruvate kinase and phosphofructokinase activities. These results indicated that the aggravation of TBBPA accumulation may be due to the hence disruption of detoxification process and limited energy available for detoxification.
Collapse
Affiliation(s)
- Weixia Zhang
- College of Animal Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Yu Tang
- College of Animal Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Yu Han
- College of Animal Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Weishang Zhou
- College of Animal Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Wei Shi
- College of Animal Sciences, Zhejiang University, Hangzhou, 310058, China
| | | | - Peng Ren
- Zhejiang Mariculture Research Institute, Wenzhou, 325005, PR China
| | - Guoqiang Xiao
- Zhejiang Mariculture Research Institute, Wenzhou, 325005, PR China
| | - Shiguo Li
- Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, PR China
| | - Guangxu Liu
- College of Animal Sciences, Zhejiang University, Hangzhou, 310058, China.
| |
Collapse
|
3
|
Shen Z, Wu J, Yu Y, Liu S, Jiang W, Nurmamat H, Wu B. Comparison of cytotoxicity and membrane efflux pump inhibition in HepG2 cells induced by single-walled carbon nanotubes with different length and functional groups. Sci Rep 2019; 9:7557. [PMID: 31101842 PMCID: PMC6525162 DOI: 10.1038/s41598-019-43900-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Accepted: 04/24/2019] [Indexed: 12/12/2022] Open
Abstract
Environmental risk of single-walled carbon nanotubes (SWCNTs) is receiving increasing attentions owing to their wide study and application. However, little is known on the influence of length and functional groups on SWCNT cytotoxicity. In this study, six types of SWCNTs with different functional groups (pristine, carboxyl group and hydroxyl group) and lengths (1-3 μm and 5-30 μm) were chosen. Cytotoxicities in human hepatoma HepG2 cells induced by these SWCNTs were compared based on cell viability, oxidative stress, plasma membrane fluidity and ABC transporter activity assays. Results showed that all the SWCNTs decreased cell viability of HepG2, increased intracellular reactive oxygen species (ROS) level, and damaged plasma membrane in a concentration-dependent manner. Long SWCNTs had stronger cytotoxic effects than short SWCNTs, which might be due to weaker aggregation for the long SWCNTs. Functionalization changed the toxic effects of the SWCNTs, and different influence was found between long SWCNTs and short SWCNTs. Moreover, the six types of SWCNTs at low concentrations changed plasma membrane fluidity, inhibited transmembrane ABC transporter (efflux pump) activity, and acted as chemosensitizer to improve the sensitivity of cells to arsenic, indicating the chemosensitive effect should be considered as toxic endpoint of SWCNTs. Comparison of different toxic endpoints among the six types of SWCNTs showed that short hydroxyl-SWCNT might be safer than other SWCNTs. This study provides insights into toxicities of SWCNTs, which is of great value for the risk assessment and application of SWCNTs.
Collapse
Affiliation(s)
- Zhuoyan Shen
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, P.R. China
| | - Jialu Wu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, P.R. China
| | - Yue Yu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, P.R. China
| | - Su Liu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, P.R. China
| | - Wei Jiang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, P.R. China
| | - Habiba Nurmamat
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, P.R. China
| | - Bing Wu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, P.R. China.
| |
Collapse
|
4
|
Xia X, Yu R, Li M, Liu L, Zhang K, Wang Y, Li B, Zhang L, Song G, Zheng X, Bai X. Molecular cloning and characterization of two genes encoding peroxiredoxins from freshwater bivalve Anodonta woodiana: Antioxidative effect and immune defense. FISH & SHELLFISH IMMUNOLOGY 2018; 82:476-491. [PMID: 30165152 DOI: 10.1016/j.fsi.2018.08.050] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2018] [Revised: 08/21/2018] [Accepted: 08/23/2018] [Indexed: 05/15/2023]
Abstract
Members of Prx family function as an important players in host defense against oxidative stress, and modulate immune responses. In the current study, two complete Prx sequences were isolated from bivalve Anodonta woodiana and respectively named AwPrx4a and AwPrx4b. Regulative characterizations of AwPrx4a and AwPrx4b derived from perfluorooctanesulfonate (PFOS), perfluoroocanoic acid (PFOA), lipopolysaccharide (LPS) and polyinosinic:polycytidylic (Poly I:C) challenge in hepatopancreas, gill and hemocytes were measured by quantitative real-time PCR, respectively. The full-length cDNA of AwPrx4a had an open reading frame ORF of 588 bp encoding 196 amino acids. Two highly conserved Prxs signature motifs were observed in deduced amino acid sequence, one was FYPLDFTFACPTEI, and the other was GEVCPA. Complete cDNA sequence of AwPrx4b was comprised of a 5' untranslated region (UTR) of 120 nucleotides, a 426 bp ORF which was encoded 142 amino acids, and a long 3'-UTR of 412 nucleotides. Expressions of AwPrx4a and AwPrx4b showed a significant up-regulation pattern in groups at lower concentration treatment of PFOS and PFOA, a biphasic profile in groups with a higher concentration treatment. Compared with that of control group, expressions of AwPrx4a and AwPrx4b were significantly induced by LPS and Poly I:C treatment in the hepatopancreas, gill and hemocytes. These results indicate up-regulations of AwPrx4a and AwPrx4b expression are associated with eliminating oxidative stress derived from PFOS and PFOA administration as well as enhancing immune defense against LPS and Poly I:C challenge.
Collapse
Affiliation(s)
- Xichao Xia
- Medical College of Pingdingshan University, Pingdingshan, 467000 Henan Province, China; State Key Laboratory of Environmental Chemistry and Eco-toxicology, Research Centre for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
| | - Ruixue Yu
- Medical College of Pingdingshan University, Pingdingshan, 467000 Henan Province, China
| | - Mengbo Li
- Medical College of Pingdingshan University, Pingdingshan, 467000 Henan Province, China
| | - Li Liu
- Medical College of Pingdingshan University, Pingdingshan, 467000 Henan Province, China
| | - Ke Zhang
- Medical College of Pingdingshan University, Pingdingshan, 467000 Henan Province, China
| | - Yu Wang
- Medical College of Pingdingshan University, Pingdingshan, 467000 Henan Province, China
| | - Bingjie Li
- Medical College of Pingdingshan University, Pingdingshan, 467000 Henan Province, China
| | - Linguo Zhang
- Medical College of Pingdingshan University, Pingdingshan, 467000 Henan Province, China
| | - Guoying Song
- Medical College of Pingdingshan University, Pingdingshan, 467000 Henan Province, China
| | - Xinhua Zheng
- Medical College of Pingdingshan University, Pingdingshan, 467000 Henan Province, China
| | - Xianguang Bai
- Medical College of Pingdingshan University, Pingdingshan, 467000 Henan Province, China
| |
Collapse
|
5
|
Faria M, Soares AMVM, Caiola N, Barata C. Effects of Camellia sinensis crude saponin on survival and biochemical markers of oxidative stress and multixenobiotic resistance of the Mediterranean mussel, Mytilus galloprovincialis. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 625:1467-1475. [PMID: 29996443 DOI: 10.1016/j.scitotenv.2017.12.274] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Revised: 12/22/2017] [Accepted: 12/22/2017] [Indexed: 06/08/2023]
Abstract
The Ebro Delta (NE Spain), formed by two bays, northern and southern hemidelta, is an area mainly devoted to rice farming. As a result shellfish species inhabiting or cultured in nearby bays may become increasingly threatened by exposure to pollutants associated to agriculture. The latest product applied in the rice fields is a plant based molluscicide called saponin, used to control populations of the giant apple snail (GAS). Saponins are known to also affect other organisms, hence research of its toxicity towards non target species is needed. In this study, mussels (Mytilus galloprovincialis) were exposed to three concentrations of suspended solid pellets containing saponin extracts from the plant species Camellia sinensis. Effects across a large set of biochemical markers were investigated in the digestive gland and gill tissue of exposed mussels to saponin for 1 and 7days. In addition, crude saponin was extracted from solid pellets to confirm its correct concentration. Results obtained from this study, showed that the concentration of crude saponin in dry pellets was of 5.5%. Lethal levels of saponin were 3.2 fold higher than the maximal predicted field concentration, and activated respiratory metabolism and expression of transmembrane protein transporters. Mussels, exposed to sub lethal concentrations of saponin showed increase of antioxidant defenses.
Collapse
Affiliation(s)
- Melissa Faria
- CESAM Institute and Biology Department, University of Aveiro, 3810-193 Aveiro, Portugal; Institute of Environmental Assessment and Water Research (IDAEA-CSIC), Barcelona, Spain.
| | - Amadeu M V M Soares
- CESAM Institute and Biology Department, University of Aveiro, 3810-193 Aveiro, Portugal.
| | - Nuno Caiola
- IRTA Aquatic Ecosystems, Sant Carles de la Ràpita, Spain.
| | - Carlos Barata
- Institute of Environmental Assessment and Water Research (IDAEA-CSIC), Barcelona, Spain.
| |
Collapse
|
6
|
Ben Cheikh Y, Xuereb B, Boulangé-Lecomte C, Le Foll F. Multixenobiotic resistance in Mytilus edulis: Molecular and functional characterization of an ABCG2- type transporter in hemocytes and gills. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2018; 195:88-96. [PMID: 29304406 DOI: 10.1016/j.aquatox.2017.12.012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2017] [Revised: 12/12/2017] [Accepted: 12/24/2017] [Indexed: 06/07/2023]
Abstract
Among the cellular protection arsenal, ABC transporters play an important role in xenobiotic efflux in marine organisms. Two pumps belonging to B and C subfamily has been identified in Mytilus edulis. In this study, we investigated the presence of the third major subtype ABCG2/BCRP protein in mussel tissues. Transcript was expressed in hemocytes and with higher level in gills. Molecular characterization revealed that mussel ABCG2 transporter shares the sequence and organizational structure with mammalian and molluscan orthologs. Overall identity of the predicted amino acid sequence with corresponding homologs from other organisms was between 49% and 98%. Moreover, protein efflux activity was demonstrated using a combination of fluorescent allocrites and specific inhibitors. The accumulation of bodipy prazosin and pheophorbide A was heterogeneous in gills and hemocytes. Most of the used blockers enhanced probe accumulation at different levels, most significantly for bodipy prazosin. Moreover, Mrp classical blocker MK571 showed a polyspecificity. In conclusion, our data demonstrate that several ABC transporters contribute to MXR phenotype in the blue mussel including ABCG2 that forms an active pump in hemocytes and gills. Efforts are needed to distinguish between the different members and to explore their single function and specificity towards allocrites and chemosensitizers.
Collapse
Affiliation(s)
- Yosra Ben Cheikh
- University of Le Havre Normandy, Environmental Stress and Aquatic Biomonitoring, UMR-I 02 SEBIO, 25 rue Philippe Lebon, F-76063, Le Havre, France.
| | - Benoit Xuereb
- University of Le Havre Normandy, Environmental Stress and Aquatic Biomonitoring, UMR-I 02 SEBIO, 25 rue Philippe Lebon, F-76063, Le Havre, France
| | - Céline Boulangé-Lecomte
- University of Le Havre Normandy, Environmental Stress and Aquatic Biomonitoring, UMR-I 02 SEBIO, 25 rue Philippe Lebon, F-76063, Le Havre, France
| | - Frank Le Foll
- University of Le Havre Normandy, Environmental Stress and Aquatic Biomonitoring, UMR-I 02 SEBIO, 25 rue Philippe Lebon, F-76063, Le Havre, France
| |
Collapse
|
7
|
Efferth T, Volm M. Multiple resistance to carcinogens and xenobiotics: P-glycoproteins as universal detoxifiers. Arch Toxicol 2017; 91:2515-2538. [DOI: 10.1007/s00204-017-1938-5] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Accepted: 01/12/2017] [Indexed: 01/08/2023]
|
8
|
Cunha V, Burkhardt-Medicke K, Wellner P, Santos MM, Moradas-Ferreira P, Luckenbach T, Ferreira M. Effects of pharmaceuticals and personal care products (PPCPs) on multixenobiotic resistance (MXR) related efflux transporter activity in zebrafish (Danio rerio) embryos. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2017; 136:14-23. [PMID: 27810576 DOI: 10.1016/j.ecoenv.2016.10.022] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2016] [Revised: 10/20/2016] [Accepted: 10/21/2016] [Indexed: 06/06/2023]
Abstract
Certain ATP binding cassette (ABC) transporter proteins, such as zebrafish Abcb4, are efflux pumps acting as a cellular defence against a wide range of different, potentially toxic chemical compounds thus mediating so called multixenobiotic resistance (MXR). Certain chemicals target MXR proteins and, as so called chemosensitisers, inhibit the activity of these proteins thus increasing the toxicity of other chemicals that would normally be effluxed. In this study 14 pharmaceuticals and personal care products (PPCPs) that are being increasingly detected in aquatic systems, were assessed for interference with the MXR system of zebrafish (Danio rerio). Concentration dependent effects of test compounds were recorded with the dye accumulation assay using zebrafish embryos and in ATPase assays with recombinant zebrafish Abcb4. In the dye accumulation assay embryos at 24h post fertilisation (hpf) were exposed to 8µm rhodamine 123 along with test compounds for 2h. The rhodamine 123 tissue levels upon the exposure served as a measure for MXR transporter efflux activity of the embryo (low rhodamine levels - high activity; high levels - low activity). The known ABC protein inhibitors MK571, vinblastine and verapamil served as positive controls. All tested PPCPs affected rhodamine 123 accumulation in embryos. For seven compounds rhodamine tissue levels were either both decreased and increased depending on the compound concentration indicating both stimulation and inhibition of rhodamine 123 efflux by those compounds, only increased (inhibition, six compounds) or only decreased (stimulation, one compound). Recombinant zebrafish Abcb4 was obtained with the baculovirus expression system and PPCPs were tested for stimulation/inhibition of basal transporter ATPase activity and for inhibition of the transporter ATPase activity stimulated with verapamil. Eight of the tested PPCPs showed effects on Abcb4 ATPase activity indicating that their effects in the dye accumulation assay may have indeed resulted from interference with Abcb4-mediated rhodamine 123 efflux. Slight stimulatory effects were found for musk xylene, nerol, isoeugenol, α-amylcinnamaldehyde, α-hexylcinnamaldehyde and simvastatin indicating Abcb4 substrate/competitive inhibitor properties of those compounds. Likewise, decreases of the verapamil-stimulated Abcb4 ATPase activity by diclofenac and fluoxetine may indicate competitive transporter inhibition. Sertraline inhibited the basal and verapamil-stimulated Abcb4 ATPase activities suggesting its property as non-competitive Abcb4 inhibitor. Taken together, our finding that chemically diverse PPCPs interfere with MXR efflux activity of zebrafish indicates that (1) efflux transporters may influence bioaccumulation of many PPCPs in fish and that (2) many PPCPs may act as chemosensitisers. Furthermore, it appears that interference of PPCPs with efflux activity in zebrafish embryos is not only from effects on Abcb4 but also on other efflux transporter subtypes.
Collapse
Affiliation(s)
- V Cunha
- CIIMAR/CIMAR-Interdisciplinary Centre of Marine and Environmental Research, Coastal and Marine Environmental Toxicology Lab, 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.
| | - K Burkhardt-Medicke
- UFZ-Helmholtz-Centre for Environmental Research, Department of Bioanalytical Ecotoxicology, Permoserstraße 15, 04318 Leipzig, Germany; Technische Universitaet Dresden, Faculty of Environmental Sciences, Institute of Hydrobiology, 01062 Dresden, Germany
| | - P Wellner
- UFZ-Helmholtz-Centre for Environmental Research, Department of Bioanalytical Ecotoxicology, Permoserstraße 15, 04318 Leipzig, Germany
| | - M M Santos
- CIIMAR/CIMAR-Interdisciplinary Centre of Marine and Environmental Research, Coastal and Marine Environmental Toxicology Lab, University of Porto, Rua dos Bragas, 289, 4050-123 Porto, Portugal; FCUP-Dept of Biology, Faculty of Sciences, University of Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal; 5IBMC-Institute for Molecular and Cell Biology, University of Porto, Rua do Campo Alegre, 823, 4150-180 Porto, Portugal
| | - P Moradas-Ferreira
- ICBAS/UP-Institute of Biomedical Sciences Abel Salazar, University of Porto, Largo Professor Abel Salazar, 2, 4099-003 Porto, Portugal; I3S-Institute for Research and Innovation in Health, University of Porto, Rua Alfredo Allen, 208, 4200-135 Porto, Portugal; IBMC, Institute for Molecular and Cell Biology, Porto, Portugal
| | - T Luckenbach
- UFZ-Helmholtz-Centre for Environmental Research, Department of Bioanalytical Ecotoxicology, Permoserstraße 15, 04318 Leipzig, Germany
| | - M Ferreira
- CIIMAR/CIMAR-Interdisciplinary Centre of Marine and Environmental Research, Coastal and Marine Environmental Toxicology Lab, University of Porto, Rua dos Bragas, 289, 4050-123 Porto, Portugal; School of Marine Studies, Faculty of Science, Technology and Environment, The University of South Pacific, Laucala Bay Road, Suva, Fiji Islands
| |
Collapse
|
9
|
Jordão R, Campos B, Piña B, Tauler R, Soares AMVM, Barata C. Mechanisms of Action of Compounds That Enhance Storage Lipid Accumulation in Daphnia magna. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:13565-13573. [PMID: 27993043 PMCID: PMC5322474 DOI: 10.1021/acs.est.6b04768] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2016] [Revised: 11/04/2016] [Accepted: 11/10/2016] [Indexed: 05/20/2023]
Abstract
Accumulation of storage lipids in the crustacean Daphnia magna can be altered by a number of exogenous and endogenous compounds, like 20-hydroxyecdysone (natural ligand of the ecdysone receptor, EcR), methyl farnesoate, pyrirproxyfen (agonists of the methyl farnesoate receptor, MfR), and tributyltin (agonist of the retinoid X acid receptor, RXR). This effect, analogous to the obesogenic disruption in mammals, alters Daphnia's growth and reproductive investment. Here we propose that storage lipid accumulation in droplets is regulated in Daphnia by the interaction between the nuclear receptor heterodimer EcR:RXR and MfR. The model was tested by determining changes in storage lipid accumulation and on gene transcription in animals exposed to different effectors of RXR, EcR, and MfR signaling pathways, either individually or in combination. RXR, EcR, and MfR agonists increased storage lipid accumulation, whereas fenarimol and testosterone (reported inhibitors of ecdysteroid synthesis and an EcR antagonist, respectively) decreased it. Joint effects of mixtures with fenarimol, testosterone, and ecdysone were antagonistic, mixtures of juvenoids showed additive effects following a concentration addition model, and combinations of tributyltin with juvenoids resulted in greater than additive effects. Co-exposures of ecdysone with juvenoids resulted in deregulation of ecdysone- and farnesoid-regulated genes, accordingly with the observed changes in lipid accumulation These results indicate the requirement of ecdysone binding to the EcR:RXR:MfR complex to regulate lipid storage and that an excess of ecdysone disrupts the whole process, probably by triggering negative feedback mechanisms.
Collapse
Affiliation(s)
- Rita Jordão
- Department
of Environmental Chemistry, Institute of
Environmental Assessment and Water Research (IDAEA), Spanish Research
Council (IDAEA, CSIC), Jordi Girona 18, 08034 Barcelona, Spain
- Centre
for Environmental and Marine studies (CESAM), Department of Biology, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - Bruno Campos
- Department
of Environmental Chemistry, Institute of
Environmental Assessment and Water Research (IDAEA), Spanish Research
Council (IDAEA, CSIC), Jordi Girona 18, 08034 Barcelona, Spain
| | - Benjamín Piña
- Department
of Environmental Chemistry, Institute of
Environmental Assessment and Water Research (IDAEA), Spanish Research
Council (IDAEA, CSIC), Jordi Girona 18, 08034 Barcelona, Spain
| | - Romà Tauler
- Department
of Environmental Chemistry, Institute of
Environmental Assessment and Water Research (IDAEA), Spanish Research
Council (IDAEA, CSIC), Jordi Girona 18, 08034 Barcelona, Spain
| | - Amadeu M. V. M. Soares
- Centre
for Environmental and Marine studies (CESAM), Department of Biology, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - Carlos Barata
- Department
of Environmental Chemistry, Institute of
Environmental Assessment and Water Research (IDAEA), Spanish Research
Council (IDAEA, CSIC), Jordi Girona 18, 08034 Barcelona, Spain
- Telephone: ± 34-93-4006100. Fax: ±
34-93-2045904. E-mail: (C.B.)
| |
Collapse
|