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Pinto A, Macário IPE, Marques SM, Lourenço J, Domingues I, Botelho MJ, Asselman J, Pereira P, Pereira JL. A short-term exposure to saxitoxin triggers a multitude of deleterious effects in Daphnia magna at levels deemed safe for human health. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 951:175431. [PMID: 39128511 DOI: 10.1016/j.scitotenv.2024.175431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2024] [Revised: 08/07/2024] [Accepted: 08/08/2024] [Indexed: 08/13/2024]
Abstract
Harmful algal blooms and the toxins produced during these events are a human and environmental health concern worldwide. Saxitoxin and its derivatives are potent natural aquatic neurotoxins produced by certain freshwater cyanobacteria and marine algae species during these bloom events. Saxitoxins effects on human health are well studied, however its effects on aquatic biota are still largely unexplored. This work aims at evaluating the effects of a pulse acute exposure (24 h) of the model cladoceran Daphnia magna to 30 μg saxitoxin L-1, which corresponds to the safety guideline established by the World Health Organization (WHO) for these toxins in recreational freshwaters. Saxitoxin effects were assessed through a comprehensive array of biochemical (antioxidant enzymes activity and lipid peroxidation), genotoxicity (alkaline comet assay), neurotoxicity (total cholinesterases activity), behavioral (swimming patterns), physiological (feeding rate and heart rate), and epigenetic (total 5-mC DNA methylation) biomarkers. Exposure resulted in decreased feeding rate, heart rate, total cholinesterases activity and catalase activity. Contrarily, other antioxidant enzymes, namely glutathione-S-transferases and selenium-dependent Glutathione peroxidase had their activity increased, together with lipid peroxidation levels. The enhancement of the antioxidant enzymes was not sufficient to prevent oxidative damage, as underpinned by lipid peroxidation enhancement. Accordingly, average DNA damage level was significantly increased in STX-exposed daphnids. Total DNA 5-mC level was significantly decreased in exposed organisms. Results showed that even a short-term exposure to saxitoxin causes significant effects on critical molecular and cellular pathways and modulates swimming patterns in D. magna individuals. This study highlights sub-lethal effects caused by saxitoxin in D. magna, suggesting that these toxins may represent a marked challenge to their thriving even at a concentration deemed safe for humans by the WHO.
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Affiliation(s)
- Albano Pinto
- CESAM-Centre for Environmental and Marine Studies, Department of Biology, University of Aveiro, Portugal; Department of Biology, University of Aveiro, Aveiro, Portugal.
| | - Inês P E Macário
- CESAM-Centre for Environmental and Marine Studies, Department of Biology, University of Aveiro, Portugal; Department of Biology, University of Aveiro, Aveiro, Portugal
| | - Sérgio M Marques
- CESAM-Centre for Environmental and Marine Studies, Department of Biology, University of Aveiro, Portugal; Department of Biology, University of Aveiro, Aveiro, Portugal
| | - Joana Lourenço
- CESAM-Centre for Environmental and Marine Studies, Department of Biology, University of Aveiro, Portugal; Department of Biology, University of Aveiro, Aveiro, Portugal
| | - Inês Domingues
- CESAM-Centre for Environmental and Marine Studies, Department of Biology, University of Aveiro, Portugal; Department of Biology, University of Aveiro, Aveiro, Portugal
| | - Maria João Botelho
- IPMA, Portuguese Institute for the Sea and Atmosphere, Av. Alfredo Magalhães Ramalho 6, 1495-165 Algés, Portugal; CIIMAR, Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Terminal de Cruzeiros do Porto, Av. General Norton de Matos s/n, 4450-208 Matosinhos, Portugal
| | - Jana Asselman
- Blue Growth Research Lab, Ghent University, Bluebridge Building, Ostend Science Park 1, 8400 Ostend, Belgium
| | - Patrícia Pereira
- CESAM-Centre for Environmental and Marine Studies, Department of Biology, University of Aveiro, Portugal; Department of Biology, University of Aveiro, Aveiro, Portugal
| | - Joana L Pereira
- CESAM-Centre for Environmental and Marine Studies, Department of Biology, University of Aveiro, Portugal; Department of Biology, University of Aveiro, Aveiro, Portugal
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Pinto A, Botelho MJ, Churro C, Asselman J, Pereira P, Pereira JL. A review on aquatic toxins - Do we really know it all regarding the environmental risk posed by phytoplankton neurotoxins? JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 345:118769. [PMID: 37597370 DOI: 10.1016/j.jenvman.2023.118769] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 07/24/2023] [Accepted: 08/09/2023] [Indexed: 08/21/2023]
Abstract
Aquatic toxins are potent natural toxins produced by certain cyanobacteria and marine algae species during harmful cyanobacterial and algal blooms (CyanoHABs and HABs, respectively). These harmful bloom events and the toxins produced during these events are a human and environmental health concern worldwide, with occurrence, frequency and severity of CyanoHABs and HABs being predicted to keep increasing due to ongoing climate change scenarios. These contexts, as well as human health consequences of some toxins produced during bloom events have been thoroughly reviewed before. Conversely, the wider picture that includes the non-human biota in the assessment of noxious effects of toxins is much less covered in the literature and barely covered by review works. Despite direct human exposure to aquatic toxins and related deleterious effects being responsible for the majority of the public attention to the blooms' problematic, it constitutes a very limited fraction of the real environmental risk posed by these toxins. The disruption of ecological and trophic interactions caused by these toxins in the aquatic biota building on deleterious effects they may induce in different species is paramount as a modulator of the overall magnitude of the environmental risk potentially involved, thus necessarily constraining the quality and efficiency of the management strategies that should be placed. In this way, this review aims at updating and consolidating current knowledge regarding the adverse effects of aquatic toxins, attempting to going beyond their main toxicity pathways in human and related models' health, i.e., also focusing on ecologically relevant model organisms. For conciseness and considering the severity in terms of documented human health risks as a reference, we restricted the detailed revision work to neurotoxic cyanotoxins and marine toxins. This comprehensive revision of the systemic effects of aquatic neurotoxins provides a broad overview of the exposure and the hazard that these compounds pose to human and environmental health. Regulatory approaches they are given worldwide, as well as (eco)toxicity data available were hence thoroughly reviewed. Critical research gaps were identified particularly regarding (i) the toxic effects other than those typical of the recognized disease/disorder each toxin causes following acute exposure in humans and also in other biota; and (ii) alternative detection tools capable of being early-warning signals for aquatic toxins occurrence and therefore provide better human and environmental safety insurance. Future directions on aquatic toxins research are discussed in face of the existent knowledge, with particular emphasis on the much-needed development and implementation of effective alternative (eco)toxicological biomarkers for these toxins. The wide-spanning approach followed herein will hopefully stimulate future research more broadly addressing the environmental hazardous potential of aquatic toxins.
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Affiliation(s)
- Albano Pinto
- CESAM - Centre for Environmental and Marine Studies, Department of Biology, University of Aveiro, Portugal.
| | - Maria João Botelho
- IPMA, Portuguese Institute for the Sea and Atmosphere, Av. Alfredo Magalhães Ramalho 6, 1495-165, Algés, Portugal; CIIMAR, Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Terminal de Cruzeiros do Porto, Av. General Norton de Matos s/n, 4450-208, Matosinhos, Portugal
| | - Catarina Churro
- IPMA, Portuguese Institute for the Sea and Atmosphere, Av. Alfredo Magalhães Ramalho 6, 1495-165, Algés, Portugal; CIIMAR, Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Terminal de Cruzeiros do Porto, Av. General Norton de Matos s/n, 4450-208, Matosinhos, Portugal
| | - Jana Asselman
- Blue Growth Research Lab, Ghent University, Bluebridge Building, Ostend Science Park 1, 8400, Ostend, Belgium
| | - Patrícia Pereira
- CESAM - Centre for Environmental and Marine Studies, Department of Biology, University of Aveiro, Portugal
| | - Joana Luísa Pereira
- CESAM - Centre for Environmental and Marine Studies, Department of Biology, University of Aveiro, Portugal
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Omidi A, Pflugmacher S, Kaplan A, Kim YJ, Esterhuizen M. Reviewing Interspecies Interactions as a Driving Force Affecting the Community Structure in Lakes via Cyanotoxins. Microorganisms 2021; 9:1583. [PMID: 34442662 PMCID: PMC8401979 DOI: 10.3390/microorganisms9081583] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Revised: 07/21/2021] [Accepted: 07/23/2021] [Indexed: 11/26/2022] Open
Abstract
The escalating occurrence of toxic cyanobacterial blooms worldwide is a matter of concern. Global warming and eutrophication play a major role in the regularity of cyanobacterial blooms, which has noticeably shifted towards the predomination of toxic populations. Therefore, understanding the effects of cyanobacterial toxins in aquatic ecosystems and their advantages to the producers are of growing interest. In this paper, the current literature is critically reviewed to provide further insights into the ecological contribution of cyanotoxins in the variation of the lake community diversity and structure through interspecies interplay. The most commonly detected and studied cyanobacterial toxins, namely the microcystins, anatoxins, saxitoxins, cylindrospermopsins and β-N-methylamino-L-alanine, and their ecotoxicity on various trophic levels are discussed. This work addresses the environmental characterization of pure toxins, toxin-containing crude extracts and filtrates of single and mixed cultures in interspecies interactions by inducing different physiological and metabolic responses. More data on these interactions under natural conditions and laboratory-based studies using direct co-cultivation approaches will provide more substantial information on the consequences of cyanotoxins in the natural ecosystem. This review is beneficial for understanding cyanotoxin-mediated interspecies interactions, developing bloom mitigation technologies and robustly assessing the hazards posed by toxin-producing cyanobacteria to humans and other organisms.
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Affiliation(s)
- Azam Omidi
- Chair Ecological Impact Research and Ecotoxicology, Technische Universität Berlin, 10587 Berlin, Germany;
| | - Stephan Pflugmacher
- Clayton H. Riddell Faculty of Environment, Earth, and Resources, University of Manitoba, Wallace Bldg., 125 Dysart Rd, Winnipeg, MB R3T 2N2, Canada;
| | - Aaron Kaplan
- Department of Plant and Environmental Sciences, Edmond J. Safra Campus, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel;
| | - Young Jun Kim
- Joint Laboratory of Applied Ecotoxicology, Korean Institute of Science and Technology Europe (KIST), Campus 7.1, 66123 Saarbrücken, Germany;
| | - Maranda Esterhuizen
- Joint Laboratory of Applied Ecotoxicology, Korean Institute of Science and Technology Europe (KIST), Campus 7.1, 66123 Saarbrücken, Germany;
- Ecosystems and Environment Research Programme, Faculty of Biological and Environmental Sciences, University of Helsinki, Niemenkatu 73, 15140 Lahti, Finland
- Finland and Helsinki Institute of Sustainability Science (HELSUS), Fabianinkatu 33, 00014 Helsinki, Finland
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Majewska M, Harshkova D, Pokora W, Baścik-Remisiewicz A, Tułodziecki S, Aksmann A. Does diclofenac act like a photosynthetic herbicide on green algae? Chlamydomonas reinhardtii synchronous culture-based study with atrazine as reference. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2021; 208:111630. [PMID: 33396150 DOI: 10.1016/j.ecoenv.2020.111630] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Revised: 11/02/2020] [Accepted: 11/05/2020] [Indexed: 06/12/2023]
Abstract
The non-steroidal anti-inflammatory drug diclofenac (DCF) is one of the commonly used and frequently detected drugs in water bodies, and several studies indicate its toxic effect on plants and algae. Studies performed with asynchronous Chlamydomonas reinhardtii cultures indicated that DCF inhibit the growth of population of the algae. Here, a synchronous population of C. reinhardtii, in which all cells are in the same developmental phase, is used. Following changes in cells size, photosynthetic activity and gene expression, we could compare, at the level of single cell, DCF-mediated effects with the effects caused by atrazine, a triazine herbicide that inhibits photosynthesis and triggers oxidative stress. Application of DCF and atrazine at the beginning of the cell cycle allowed us to follow the changes occurring in the cells in the subsequent stages of their development. Synchronized Chlamydomonas reinhardtii cultures (strain CC-1690, wild type) were exposed to diclofenac sodium salt (135 mg/L) or atrazine (77.6 µg/L). The cell suspension was sampled hourly (0-10 h) in the light period of the cell cycle to determine cell number and volume, photosynthetic pigment content, chlorophyll a fluorescence (OJIP test) in vivo, and selected gene expression (real-time qPCR), namely psbA, psaA, FSD1, MSD3 and APX1. The two toxicants differently influenced C. reinhardtii cells. Both substances decreased photosynthetic "vitality" (PI - performance index) of the cells, albeit for different reasons. While atrazine significantly disrupted the photosynthetic electron transport, resulting in excessive production of reactive oxygen species (ROS) and limited cell growth, DCF caused silencing of photosystem II (PSII) reaction centers, transforming them into "heat sinks", thus preventing significant ROS overproduction. Oxidative stress caused by atrazine was the probable reason for the rapid appearance of phytotoxic action soon after entering the cells, while the effects of DCF could only be seen several hours after treatment. A comparison of DCF-caused effects with the effects caused by atrazine led us to conclude that, although DCF cannot be regarded as typical photosynthetic herbicide, it exhibits an algicidal activity and can be potentially dangerous for aquatic plants and algae.
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Affiliation(s)
- Monika Majewska
- Department of Plant Physiology and Biotechnology, Faculty of Biology, University of Gdańsk, ul. Wita Stwosza 59, 80-308 Gdańsk, Poland
| | - Darya Harshkova
- Department of Plant Physiology and Biotechnology, Faculty of Biology, University of Gdańsk, ul. Wita Stwosza 59, 80-308 Gdańsk, Poland
| | - Wojciech Pokora
- Department of Plant Physiology and Biotechnology, Faculty of Biology, University of Gdańsk, ul. Wita Stwosza 59, 80-308 Gdańsk, Poland
| | - Agnieszka Baścik-Remisiewicz
- Department of Plant Physiology and Biotechnology, Faculty of Biology, University of Gdańsk, ul. Wita Stwosza 59, 80-308 Gdańsk, Poland
| | - Szymon Tułodziecki
- Department of Plant Physiology and Biotechnology, Faculty of Biology, University of Gdańsk, ul. Wita Stwosza 59, 80-308 Gdańsk, Poland
| | - Anna Aksmann
- Department of Plant Physiology and Biotechnology, Faculty of Biology, University of Gdańsk, ul. Wita Stwosza 59, 80-308 Gdańsk, Poland.
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Echeverri-Jaramillo G, Jaramillo-Colorado B, Sabater-Marco C, Castillo-López MÁ. Cytotoxic and estrogenic activity of chlorpyrifos and its metabolite 3,5,6-trichloro-2-pyridinol. Study of marine yeasts as potential toxicity indicators. ECOTOXICOLOGY (LONDON, ENGLAND) 2021; 30:104-117. [PMID: 33249537 DOI: 10.1007/s10646-020-02315-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 11/10/2020] [Indexed: 06/12/2023]
Abstract
Chlorpyrifos (CP) is one of the organophosphate insecticides most used worldwide today. Although the main target organ for CP is the nervous system triggering predominantly neurotoxic effects, it has suggested other mechanisms of action as cytotoxicity and endocrine disruption. The risk posed by the pesticide metabolites on non-target organisms is increasingly recognized by regulatory agencies and natural resource managers. In the present study, cytotoxicity and estrogenic activity of CP, and its principal metabolite 3,5,6-trichloro-2-pyridinol (TCP) have been evaluated by in vitro assays, using two mammalian cell lines (HEK293 and N2a), and a recombinant yeast. Results indicate that TCP is more toxic than CP for the two cell lines assayed, being N2a cells more sensitive to both compounds. Both compounds show a similar estrogenic activity being between 2500 and 3000 times less estrogenic than 17β-estradiol. In order to find new toxicity measurement models, yeasts isolated from marine sediments containing CP residues have been tested against CP and TCP by cell viability assay. Of the 12 yeast strains tested, 6 of them showed certain sensitivity, and a concentration-dependent response to the tested compounds, so they could be considered as future models for toxicity tests, although further investigations and proves are necessary.
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Affiliation(s)
- Gustavo Echeverri-Jaramillo
- Grupo de Investigación Microbiología y Ambiente, GIMA. Programa de Bacteriología, Universidad de San Buenaventura, Cartagena, Colombia
- Grupo de Investigaciones Agroquímicas, GIA. Programa de Química, Universidad de Cartagena, 130014, Cartagena, Colombia
| | - Beatriz Jaramillo-Colorado
- Grupo de Investigaciones Agroquímicas, GIA. Programa de Química, Universidad de Cartagena, 130014, Cartagena, Colombia.
| | - Consuelo Sabater-Marco
- Departamento de Biotecnología, Universidad Politécnica de Valencia, 46022, Valencia, España
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Serrà A, Philippe L, Perreault F, Garcia-Segura S. Photocatalytic treatment of natural waters. Reality or hype? The case of cyanotoxins remediation. WATER RESEARCH 2021; 188:116543. [PMID: 33137522 DOI: 10.1016/j.watres.2020.116543] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Revised: 10/18/2020] [Accepted: 10/19/2020] [Indexed: 05/08/2023]
Abstract
This review compiles recent advances and challenges in the photocatalytic treatment of natural water by analyzing the remediation of cyanotoxins. The review frames the treatment need based on the occurrence, geographical distribution, and legislation of cyanotoxins in drinking water while highlighting the underestimated global risk of cyanotoxins. Next, the fundamental principles of photocatalytic treatment for remediating cyanotoxins and the complex degradation pathway for the most widespread cyanotoxins are presented. The state-of-the-art and recent advances on photocatalytic treatment processes are critically discussed, especially the modification strategies involving TiO2 and the primary operational conditions that determine the scalability and integration of photocatalytic reactors. The relevance of light sources and light delivery strategies are shown, with emphasis on novel biomimicry materials design. Thereafter, the seldomly-addressed role of water-matrix components is thoroughly and critically explored by including natural organic matter and inorganic species to provide future directions in designing highly efficient strategies and scalable reactors.
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Affiliation(s)
- Albert Serrà
- Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Mechanics of Materials and Nanostructures, Feuerwerkerstrasse 39, CH-3602 Thun, Switzerland.
| | - Laetitia Philippe
- Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Mechanics of Materials and Nanostructures, Feuerwerkerstrasse 39, CH-3602 Thun, Switzerland
| | - François Perreault
- Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment. School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ, 85287-3005, USA
| | - Sergi Garcia-Segura
- Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment. School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ, 85287-3005, USA.
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Viallon J, Chinain M, Darius HT. Revisiting the Neuroblastoma Cell-Based Assay (CBA-N2a) for the Improved Detection of Marine Toxins Active on Voltage Gated Sodium Channels (VGSCs). Toxins (Basel) 2020; 12:E281. [PMID: 32349302 PMCID: PMC7290318 DOI: 10.3390/toxins12050281] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Revised: 04/23/2020] [Accepted: 04/24/2020] [Indexed: 02/06/2023] Open
Abstract
The neuroblastoma cell-based assay (CBA-N2a) is widely used for the detection of marine biotoxins in seafood products, yet a consensus protocol is still lacking. In this study, six key parameters of CBA-N2a were revisited: cell seeding densities, cell layer viability after 26 h growth, MTT incubation time, Ouabain and Veratridine treatment and solvent and matrix effects. A step-by-step protocol was defined identifying five viability controls for the validation of CBA-N2a results. Specific detection of two voltage gated sodium channel activators, pacific ciguatoxin (P-CTX3C) and brevetoxin (PbTx3) and two inhibitors, saxitoxin (STX) and decarbamoylsaxitoxin (dc-STX) was achieved, with EC50 values of 1.7 ± 0.35 pg/mL, 5.8 ± 0.9 ng/mL, 3 ± 0.5 ng/mL and 15.8 ± 3 ng/mL, respectively. When applied to the detection of ciguatoxin (CTX)-like toxicity in fish samples, limit of detection (LOD) and limit of quantification (LOQ) values were 0.031 ± 0.008 and 0.064 ± 0.016 ng P-CTX3C eq/g of flesh, respectively. Intra and inter-assays comparisons of viability controls, LOD, LOQ and toxicity in fish samples gave coefficients of variation (CVs) ranging from 3% to 29%. This improved test adaptable to either high throughput screening or composite toxicity estimation is a useful starting point for a standardization of the CBA-N2a in the field of marine toxin detection.
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Affiliation(s)
| | | | - Hélène Taiana Darius
- Institut Louis Malardé (ILM), Laboratory of Marine Biotoxins-UMR 241-EIO, 98713 Papeete-Tahiti, French Polynesia; (J.V.); (M.C.)
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Paralytic Shellfish Toxins and Ocean Warming: Bioaccumulation and Ecotoxicological Responses in Juvenile Gilthead Seabream ( Sparus aurata). Toxins (Basel) 2019; 11:toxins11070408. [PMID: 31337041 PMCID: PMC6669718 DOI: 10.3390/toxins11070408] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Revised: 07/05/2019] [Accepted: 07/09/2019] [Indexed: 01/27/2023] Open
Abstract
Warmer seawater temperatures are expected to increase harmful algal blooms (HABs) occurrence, intensity, and distribution. Yet, the potential interactions between abiotic stressors and HABs are still poorly understood from ecological and seafood safety perspectives. The present study aimed to investigate, for the first time, the bioaccumulation/depuration mechanisms and ecotoxicological responses of juvenile gilthead seabream (Sparus aurata) exposed to paralytic shellfish toxins (PST) under different temperatures (18, 21, 24 °C). PST were detected in fish at the peak of the exposure period (day five, 0.22 µg g-1 N-sulfocarbamoylGonyautoxin-1-2 (C1 and C2), 0.08 µg g-1 Decarbamoylsaxitoxin (dcSTX) and 0.18 µg g-1 Gonyautoxin-5 (B1)), being rapidly eliminated (within the first 24 h of depuration), regardless of exposure temperature. Increased temperatures led to significantly higher PST contamination (275 µg STX eq. kg-1). During the trial, fish antioxidant enzyme activities (superoxide dismutase, SOD; catalase, CAT; glutathione S-transferase, GST) in both muscle and viscera were affected by temperature, whereas a significant induction of heat shock proteins (HSP70), Ubiquitin (Ub) activity (viscera), and lipid peroxidation (LPO; muscle) was observed under the combination of warming and PST exposure. The differential bioaccumulation and biomarker responses observed highlight the need to further understand the interactive effects between PST and abiotic stressors, to better estimate climate change impacts on HABs events, and to develop mitigation strategies to overcome the potential risks associated with seafood consumption.
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Puerari RC, Ferrari E, de Cezar MG, Gonçalves RA, Simioni C, Ouriques LC, Vicentini DS, Matias WG. Investigation of toxicological effects of amorphous silica nanostructures with amine-functionalized surfaces on Vero cells. CHEMOSPHERE 2019; 214:679-687. [PMID: 30292050 DOI: 10.1016/j.chemosphere.2018.09.165] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Revised: 09/27/2018] [Accepted: 09/28/2018] [Indexed: 06/08/2023]
Abstract
Amorphous silica (SiO2) nanostructures are described in the literature as having low toxicity and are widely used in many industrial products. However, surface modifications, such as amine-functionalization, can result in increased cytotoxicity. In this study, amorphous SiO2 nanostructures (SiO2 NS) were synthesized and amine-functionalized with two different amine molecules: primary (SiO2 NS@1) and tri-amine (SiO2 NS@3). The materials were characterized by transmission electron microscopy (TEM), zeta potential (ZP), effective diameter (ED) and surface area measurements, X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The toxicity of the three SiO2 NS samples toward Vero cells was evaluated. According to the methyl thiazolyl tetrazolium (MTT) assay, the IC50,24h was 1.477 ± 0.12 g L-1 for SiO2 NS, 0.254 ± 0.07 g L-1 for SiO2 NS@1 and 0.117 ± 0.05 g L-1 for SiO2 NS@3. The order of cytotoxicity was SiO2 NS@3 > SiO2 NS@1 » SiO2 NS. There was an increase in malondialdehyde (MDA) levels and ROS productions in the cells exposed to all three materials. Also, TEM images showed damage on the mitochondria and rough endoplasmic reticulum.
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Affiliation(s)
- Rodrigo Costa Puerari
- Department of Sanitary and Environmental Engineering, Federal University of Santa Catarina, Florianópolis, Brazil
| | - Emeline Ferrari
- Department of Basic and Applied Sciences, University of Lorraine, Metz, France
| | - Martina Garcia de Cezar
- Department of Sanitary and Environmental Engineering, Federal University of Santa Catarina, Florianópolis, Brazil
| | - Renata Amanda Gonçalves
- Department of Sanitary and Environmental Engineering, Federal University of Santa Catarina, Florianópolis, Brazil
| | - Carmen Simioni
- Department of Cell Biology, Embryology and Genetics Federal University of Santa Catarina, Florianópolis, Brazil
| | - Luciane Cristina Ouriques
- Department of Cell Biology, Embryology and Genetics Federal University of Santa Catarina, Florianópolis, Brazil
| | - Denice Schulz Vicentini
- Department of Sanitary and Environmental Engineering, Federal University of Santa Catarina, Florianópolis, Brazil
| | - William Gerson Matias
- Department of Sanitary and Environmental Engineering, Federal University of Santa Catarina, Florianópolis, Brazil.
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Zhou Z, Tang X, Chen H, Wang Y. Comparative studies of saxitoxin (STX) -induced cytotoxicity in Neuro-2a and RTG-2 cell lines: An explanation with respect to changes in ROS. CHEMOSPHERE 2018; 192:66-74. [PMID: 29100123 DOI: 10.1016/j.chemosphere.2017.10.083] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Revised: 10/06/2017] [Accepted: 10/14/2017] [Indexed: 06/07/2023]
Abstract
Saxitoxin (STX), a paralytic shellfish toxin (PST) produced from toxic bloom-forming dinoflagellates, was selected to comparatively investigate the induction of cytotoxicity and apoptosis and a possible mechanism based on changes in the antioxidant defence system of two cellular strains: the mouse neuroblastoma cell line Neuro-2a and the rainbow trout fish cell line RTG-2. Increasing concentrations of STX (0-256 nM) presented little cytotoxic or apoptotic effects on the two cell lines. Measurements of cellular viability, lethal ratio and LDH leakage showed slight changes in Neuro-2a and RTG-2 cells (p > 0.05), and similar results were observed for cellular morphology and apoptotic rates. The contents of the main reactive oxygen species (ROS) components, superoxide anion (O2-) and hydrogen peroxide (H2O2), were markedly increased in Neuro-2a cell with STX exposure at middle (15 nM) and high (150 nM) concentrations (p < 0.05), and the simultaneous increase of the ratio of reduced/oxidized glutathione (GSH/GSSG) (p < 0.05) inferred the occurrence of oxidative stress. However, little difference was observed in all treated groups of RTG-2 cells. The activities of three antioxidant enzymes, superoxide dismutase (SOD), catalase (CAT) and glutathione reductase (GR), were significantly enhanced in Neuro-2a cells in the middle and high concentration groups (p < 0.05), while glutathione peroxidase (GPX) obviously decreased (p < 0.05) in all treated groups. Little change was found in RTG-2 cells with the same exposures. These results provided evidence that STX exposure altered the redox status of Neuro-2a cells and resulted in oxidative stress, but the same exposure exerted little effect on RTG-2 cells. Therefore, Neuro-2a cells are more sensitive than reproductive cells to STX exposure, and the antioxidant systems appears to be partly responsible for this differentiation response.
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Affiliation(s)
- Zhongyuan Zhou
- Department of Marine Ecology, College of Marine Life Science, Ocean University of China, Qingdao, 266003, China.
| | - Xuexi Tang
- Department of Marine Ecology, College of Marine Life Science, Ocean University of China, Qingdao, 266003, China; Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266071, China.
| | - Hongmei Chen
- Key Laboratory of Xinjiang Endemic Phytomedicine Resources, Ministry of Education, Pharmacology Department, School of Pharmacy, Shihezi University, Shihezi, 832002, China.
| | - You Wang
- Department of Marine Ecology, College of Marine Life Science, Ocean University of China, Qingdao, 266003, China; Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266071, China.
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Ramos P, Schmitz M, Gama S, Portantiolo A, Durruthy MG, de Souza Votto AP, Cornetet LR, dos Santos Machado K, Werhli A, Tonel MZ, Fagan SB, Yunes JS, Monserrat JM. Cytoprotection of lipoic acid against toxicity induced by saxitoxin in hippocampal cell line HT-22 through in silico modeling and in vitro assays. Toxicology 2018; 393:171-184. [DOI: 10.1016/j.tox.2017.11.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2017] [Revised: 10/17/2017] [Accepted: 11/02/2017] [Indexed: 10/18/2022]
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12
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Ramos P, Schmitz M, Filgueira D, Votto AP, Durruthy M, Gelesky M, Ruas C, Yunes J, Tonel M, Fagan S, Monserrat J. Interaction of single-walled carbon nanotubes and saxitoxin: Ab initio simulations and biological responses in hippocampal cell line HT-22. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2017; 36:1728-1737. [PMID: 27371805 DOI: 10.1002/etc.3544] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Revised: 04/15/2016] [Accepted: 06/30/2016] [Indexed: 06/06/2023]
Abstract
Saxitoxins (STXs) are potent neurotoxins that also induce cytotoxicity through the generation of reactive oxygen species. Carbon nanotubes (CNTs) are nanomaterials that can promote a Trojan horse effect, facilitating the entry of toxic molecules to cells when adsorbed to nanomaterials. The interaction of pristine single-walled (SW)CNTs and carboxylated (SWCNT-COOH) nanotubes with STX was evaluated by ab initio simulation and bioassays using the cell line HT-22. Cells (5 × 104 cells/mL) were exposed to SWCNT and SWCNT-COOH (5 μg mL-1 ), STX (200 μg L-1 ), SWCNT+STX, and SWCNT-COOH+STX for 30 min or 24 h. Results of ab initio simulation showed that the interaction between SWCNT and SWCNT-COOH with STX occurs in a physisorption. The interaction of SWCNT+STX induced a decrease in cell viability. Cell proliferation was not affected in any treatment after 30 min or 24 h of exposure (p > 0.05). Treatment with SWCNT-COOH induced high reactive oxygen species levels, an effect attenuated in SWCNT-COOH+STX treatment. In terms of cellular oxygen consumption, both CNTs when coexposed with STX antagonize the toxin effect. Based on these results, it can be concluded that the results obtained in vitro corroborate the semiempirical evidence found using density functional theory ab initio simulation. Environ Toxicol Chem 2017;36:1728-1737. © 2016 SETAC.
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Affiliation(s)
- Patrícia Ramos
- Institute of Biological Science, Federal University of Rio Grande (FURG), Rio Grande, Rio Grande do Sul, Brazil
- Postgraduate Program in Physiological Sciences, Comparative Animal Physiology, Federal University of Rio Grande (FURG), Rio Grande, Rio Grande do Sul, Brazil
| | - Marcos Schmitz
- Institute of Biological Science, Federal University of Rio Grande (FURG), Rio Grande, Rio Grande do Sul, Brazil
| | - Daza Filgueira
- Institute of Biological Science, Federal University of Rio Grande (FURG), Rio Grande, Rio Grande do Sul, Brazil
| | - Ana Paula Votto
- Institute of Biological Science, Federal University of Rio Grande (FURG), Rio Grande, Rio Grande do Sul, Brazil
- Postgraduate Program in Physiological Sciences, Comparative Animal Physiology, Federal University of Rio Grande (FURG), Rio Grande, Rio Grande do Sul, Brazil
| | - Michael Durruthy
- Institute of Biological Science, Federal University of Rio Grande (FURG), Rio Grande, Rio Grande do Sul, Brazil
- Postgraduate Program in Physiological Sciences, Comparative Animal Physiology, Federal University of Rio Grande (FURG), Rio Grande, Rio Grande do Sul, Brazil
| | - Marcos Gelesky
- Postgraduate Program in , Technological and Environmental Chemistry, Federal University of Rio Grande (FURG), Rio Grande, Rio Grande do Sul, Brazil
| | - Caroline Ruas
- Postgraduate Program in , Technological and Environmental Chemistry, Federal University of Rio Grande (FURG), Rio Grande, Rio Grande do Sul, Brazil
| | - João Yunes
- Cyanobacteria and Ficotoxin Laboratory, Federal University of Rio Grande (FURG), Rio Grande, Rio Grande do Sul, Brazil
| | - Mariana Tonel
- Franciscan University Center (UNIFRA), Santa Maria, Rio Grande do Sul, Brazil
- Postgraduate Program in Nanoscience, Franciscan University Center (UNIFRA), Santa Maria, Rio Grande do Sul, Brazil
| | - Solange Fagan
- Franciscan University Center (UNIFRA), Santa Maria, Rio Grande do Sul, Brazil
- Postgraduate Program in Nanoscience, Franciscan University Center (UNIFRA), Santa Maria, Rio Grande do Sul, Brazil
| | - José Monserrat
- Institute of Biological Science, Federal University of Rio Grande (FURG), Rio Grande, Rio Grande do Sul, Brazil
- Postgraduate Program in Physiological Sciences, Comparative Animal Physiology, Federal University of Rio Grande (FURG), Rio Grande, Rio Grande do Sul, Brazil
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13
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Pino MR, Muñiz S, Val J, Navarro E. Phytotoxicity of 15 common pharmaceuticals on the germination of Lactuca sativa and photosynthesis of Chlamydomonas reinhardtii. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:22530-22541. [PMID: 27553001 DOI: 10.1007/s11356-016-7446-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Accepted: 08/08/2016] [Indexed: 06/06/2023]
Abstract
Pharmaceuticals reach terrestrial environments through the application of treated wastewaters and biosolids to agricultural soils. We have investigated the toxicity of 15 common pharmaceuticals, classified as nonsteroidal anti-inflammatory drugs (NSAIDs), blood lipid-lowering agents, β-blockers and antibiotics, in two photosynthetic organisms. Twelve pharmaceuticals caused inhibitory effects on the radicle and hypocotyl elongation of Lactuca sativa seeds. The EC50 values obtained were in the range of 170-5656 mg L-1 in the case of the radicle and 188-4558 mg L-1 for the hypocotyl. Propranolol was the most toxic drug for both root and hypocotyl elongation, followed by the NSAIDs, then gemfibrozil and tetracycline. Other effects, such as root necrosis, inhibition of root growth and curly hairs, were detected. However, even at the highest concentrations tested (3000 mg L-1), seed germination was not affected. NSAIDs decreased the photosynthetic yield of Chlamydomonas reinhardtii, but only salicylic acid showed EC50 values below 1000 mg L-1. The first effects detected at low concentrations, together with the concentrations found in environmental samples, indicate that the use of biosolids and wastewaters containing pharmaceuticals should be regulated and their compositions assessed in order to prevent medium- and long-term impacts on agricultural soils and crops.
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Affiliation(s)
- Ma Rosa Pino
- Faculty of Health Sciences, San Jorge University, Villanueva de Gállego, 50830, Zaragoza, Spain.
| | - Selene Muñiz
- Pyrenean Institute of Ecology, CSIC, Av. Montañana 1005, 50059, Zaragoza, Spain
| | - Jonatan Val
- Faculty of Health Sciences, San Jorge University, Villanueva de Gállego, 50830, Zaragoza, Spain
| | - Enrique Navarro
- Pyrenean Institute of Ecology, CSIC, Av. Montañana 1005, 50059, Zaragoza, Spain
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Testai E, Scardala S, Vichi S, Buratti FM, Funari E. Risk to human health associated with the environmental occurrence of cyanobacterial neurotoxic alkaloids anatoxins and saxitoxins. Crit Rev Toxicol 2016; 46:385-419. [PMID: 26923223 DOI: 10.3109/10408444.2015.1137865] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Cyanobacteria are ubiquitous photosynthetic micro-organisms forming blooms and scums in surface water; among them some species can produce cyanotoxins giving rise to some concern for human health and animal life. To date, more than 65 cyanobacterial neurotoxins have been described, of which the most studied are the groups of anatoxins and saxitoxins (STXs), comprising many different variants. In freshwaters, the hepatotoxic microcystins represent the most frequently detected cyanotoxin: on this basis, it could appear that neurotoxins are less relevant, but the low frequency of detection may partially reflect an a priori choice of target analytes, the low method sensitivity and the lack of certified standards. Cyanobacterial neurotoxins target cholinergic synapses or voltage-gated ion channels, blocking skeletal and respiratory muscles, thus leading to death by respiratory failure. This review reports and analyzes the available literature data on environmental occurrence of cyanobacterial neurotoxic alkaloids, namely anatoxins and STXs, their biosynthesis, toxicology and epidemiology, derivation of guidance values and action limits. These data are used as the basis to assess the risk posed to human health, identify critical exposure scenarios and highlight the major data gaps and research needs.
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Affiliation(s)
- Emanuela Testai
- a Environment and Primary Prevention Department , Istituto Superiore di Sanità , Rome , Italy
| | - Simona Scardala
- a Environment and Primary Prevention Department , Istituto Superiore di Sanità , Rome , Italy
| | - Susanna Vichi
- a Environment and Primary Prevention Department , Istituto Superiore di Sanità , Rome , Italy
| | - Franca M Buratti
- a Environment and Primary Prevention Department , Istituto Superiore di Sanità , Rome , Italy
| | - Enzo Funari
- a Environment and Primary Prevention Department , Istituto Superiore di Sanità , Rome , Italy
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Melegari SP, de Carvalho Pinto CRS, Moukha S, Creppy EE, Matias WG. Evaluation of Cytotoxicity and Cell Death Induced In Vitro by Saxitoxin in Mammalian Cells. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2015; 78:1189-1200. [PMID: 26436995 DOI: 10.1080/15287394.2015.1072069] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Since the cyanotoxin saxitoxin (STX) is a neurotoxin and induces ecological changes in aquatic environments, a potential risk to public and environmental health exists. However, data on STX-mediated cytotoxic and genotoxic effects are still scare. In order to gain a better understanding of the effects of this toxin, the cytotoxic and genotoxic potential of STX was examined in two mammalian cell lines. Neuro 2A (N2A), a neuroblastoma mouse cell line, and Vero cell line, derived from Vero green monkey kidney cells, were exposed to several concentrations of STX ranging from 0.5 to 64 nM to determine cell viability, induction of apoptosis (DNA fragmentation assay), and formation of micronuclei (MN) (cytokinesis-block micronucleus assay; CBMN) following 24 h of incubation. The half maximal effective concentration (EC50) values for STX calculated in cell viability tests were 1.01 nM for N2A and 0.82 nM for Vero cells. With increasing STX concentration there was evidence of DNA fragmentation indicating apoptosis induction in Vero cells with a 50% increase in DNA fragmentation compared to control at the highest STX concentration tested (3 nM). The results demonstrated no significant changes in the frequency of micronucleated binucleated cells in N2A and Vero cells exposed to STX, indicating the absence of genotoxicity under these test conditions. There was no apparent cellular necrosis as evidenced by a lack of formation of multinucleated cells. In conclusion, data reported herein demonstrate that STX produced death of both cell types tested through an apoptotic process.
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Affiliation(s)
- Silvia P Melegari
- a Department of Sanitary and Environmental Engineering , Federal University of Santa Catarina, Campus Universitário , Florianópolis , Santa Catarina , Brazil
| | - Cátia R S de Carvalho Pinto
- a Department of Sanitary and Environmental Engineering , Federal University of Santa Catarina, Campus Universitário , Florianópolis , Santa Catarina , Brazil
| | - Serge Moukha
- b UFR des Sciences Pharmaceutiques , Université Victor Segalen Bordeaux , Bordeaux Cedex , France
- c INRA-Centre de Recherche de Bordeaux Aquitaine , Unité de Mycologie et de Sécurité des Aliments, Villenave d'Ornon Cedex , France
| | - Edmond E Creppy
- b UFR des Sciences Pharmaceutiques , Université Victor Segalen Bordeaux , Bordeaux Cedex , France
| | - William G Matias
- a Department of Sanitary and Environmental Engineering , Federal University of Santa Catarina, Campus Universitário , Florianópolis , Santa Catarina , Brazil
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Zheng X, Hu B, Gao SX, Liu DJ, Sun MJ, Jiao BH, Wang LH. A saxitoxin-binding aptamer with higher affinity and inhibitory activity optimized by rational site-directed mutagenesis and truncation. Toxicon 2015; 101:41-7. [PMID: 25937337 DOI: 10.1016/j.toxicon.2015.04.017] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2015] [Revised: 04/09/2015] [Accepted: 04/29/2015] [Indexed: 10/23/2022]
Abstract
Saxitoxin (STX), a member of the family of paralytic shellfish poisoning toxins, poses toxicological and ecotoxicological risks. To develop an analytical recognition element for STX, a DNA aptamer (APT(STX1)) was previously discovered via an iterative process known as Systematic Evolution of Ligands by Exponential Enrichment (SELEX) by Handy et al. Our study focused on generating an improved aptamer based on APT(STX1) through rational site-directed mutation and truncation. In this study, we generated the aptamer, M-30f, with a 30-fold higher affinity for STX compared with APT(STX1). The Kd value for M-30f was 133 nM, which was calculated by Bio-Layer Interferometry. After optimization, we detected and compared the interaction of STX with aptamers (APT(STX1) or M-30f) through several techniques (ELISA, cell bioassay, and mouse bioassay). Both aptamers' STX-binding ability was demonstrated in all three methods. Moreover, M-30f performs better than its parent sequence with higher suppressive activity against STX. As a molecular recognition element, M-30f has good prospects for practical application.
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Affiliation(s)
- X Zheng
- Department of Biochemistry and Molecular Biology, College of Basic Medical Sciences, Second Military Medical University, No. 800, Xiangyin Rd., Shanghai 200433, People's Republic of China
| | - B Hu
- Department of Biochemistry and Molecular Biology, College of Basic Medical Sciences, Second Military Medical University, No. 800, Xiangyin Rd., Shanghai 200433, People's Republic of China; Center of Marine Biolical Medicine, College of Marine Military Medicine, Second Military Medical University, No. 800, Xiangyin Rd., Shanghai 200433, People's Republic of China
| | - S X Gao
- Department of Biochemistry and Molecular Biology, College of Basic Medical Sciences, Second Military Medical University, No. 800, Xiangyin Rd., Shanghai 200433, People's Republic of China
| | - D J Liu
- Department of Biochemistry and Molecular Biology, College of Basic Medical Sciences, Second Military Medical University, No. 800, Xiangyin Rd., Shanghai 200433, People's Republic of China; Center of Marine Biolical Medicine, College of Marine Military Medicine, Second Military Medical University, No. 800, Xiangyin Rd., Shanghai 200433, People's Republic of China
| | - M J Sun
- Department of Biochemistry and Molecular Biology, College of Basic Medical Sciences, Second Military Medical University, No. 800, Xiangyin Rd., Shanghai 200433, People's Republic of China
| | - B H Jiao
- Department of Biochemistry and Molecular Biology, College of Basic Medical Sciences, Second Military Medical University, No. 800, Xiangyin Rd., Shanghai 200433, People's Republic of China; Center of Marine Biolical Medicine, College of Marine Military Medicine, Second Military Medical University, No. 800, Xiangyin Rd., Shanghai 200433, People's Republic of China
| | - L H Wang
- Department of Biochemistry and Molecular Biology, College of Basic Medical Sciences, Second Military Medical University, No. 800, Xiangyin Rd., Shanghai 200433, People's Republic of China.
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Fuzinatto CF, Flohr L, Melegari SP, Matias WG. Oxidative stress and hypermethylation induced by exposure of Oreochromis niloticus to complex environmental mixtures of river water from Cubatão do Sul, Brazil. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2015; 114:190-197. [PMID: 25638525 DOI: 10.1016/j.ecoenv.2015.01.025] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2014] [Revised: 01/21/2015] [Accepted: 01/22/2015] [Indexed: 06/04/2023]
Abstract
In this study, we investigated the effects of oxidative stress and hypermethylation through lipid peroxidation and DNA methylation, respectively, in erythrocytes of Oreochromis niloticus exposed to environmental complex mixture of water from Cubatão do Sul River throughout the year. This river is the source of drinking water for the region of Florianópolis, the capital of Santa Catarina State, Brazil. Lipid peroxidation was quantified by the rate of malondialdehyde (MDA) formation, and DNA methylation was quantified by the rate of 5-methyldeoxycytosine (m(5)dC) formation. In all studied sites, the river water samples caused metabolic changes in O. niloticus. MDA formation rates were significantly different when compared to the negative control (except for samples from Site 1 during spring 2010, summer 2011 and fall 2011). All samples (except Site 1, spring 2010) induced increases in the m(5)dC formation rates, and at the end of the study, the values were near the values found in the positive control (potassium dichromate 2.5mg/L). The results showed that samples of environmental complex mixtures of water from Cubatão do Sul River are capable of inducing high levels of oxidative damage and hypermethylation in O. niloticus.
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Affiliation(s)
- Cristiane Funghetto Fuzinatto
- Laboratório de Toxicologia Ambiental, LABTOX, Departamento de Engenharia Sanitária e Ambiental, Universidade Federal de Santa Catarina, Campus Universitário, CEP: 88040-970 Florianópolis, SC, Brazil
| | - Letícia Flohr
- Laboratório de Toxicologia Ambiental, LABTOX, Departamento de Engenharia Sanitária e Ambiental, Universidade Federal de Santa Catarina, Campus Universitário, CEP: 88040-970 Florianópolis, SC, Brazil
| | - Sílvia Pedroso Melegari
- Laboratório de Toxicologia Ambiental, LABTOX, Departamento de Engenharia Sanitária e Ambiental, Universidade Federal de Santa Catarina, Campus Universitário, CEP: 88040-970 Florianópolis, SC, Brazil
| | - William Gerson Matias
- Laboratório de Toxicologia Ambiental, LABTOX, Departamento de Engenharia Sanitária e Ambiental, Universidade Federal de Santa Catarina, Campus Universitário, CEP: 88040-970 Florianópolis, SC, Brazil.
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18
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Perreault F, Melegari SP, Fuzinatto CF, Bogdan N, Morin M, Popovic R, Matias WG. Toxicity of PAMAM-coated gold nanoparticles in different unicellular models. ENVIRONMENTAL TOXICOLOGY 2014; 29:328-336. [PMID: 22331655 DOI: 10.1002/tox.21761] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2011] [Revised: 12/19/2011] [Accepted: 12/26/2011] [Indexed: 05/31/2023]
Abstract
Polyamidoamine (PAMAM) dendrimers are used for many pharmaceutical and biomedical applications. However, the toxicological risks of several PAMAM-based compounds are still not fully evaluated, despite evidences of PAMAM deleterious effects on biological membranes, leading to toxicity. In this report, we investigated the toxicity of generation 0 PAMAM-coated gold nanoparticles (AuG0 NPs) in four different models to determine how different cellular systems are affected by PAMAM-coated NPs. Toxicity was evaluated in two mammalian cell lines, Neuro 2A and Vero, in the green alga Chlamydomonas reinhardtii and the bacteria Vibrio fischeri. AuG0 NP treatments reduced cell metabolic activity in algal and bacterial cells, measured by esterase enzymatic activity (C. reinhardtii) and luminescence emission (V. fischeri). EC50 value after 30 min of treatment was similar in both organisms, with 0.114 and 0.167 mg mL(-1) for C. reinhardtii and V. fischeri, respectively. On the other hand, AuG0 NPs induced no change of mitochondrial activity in mammalian cells after 24 h of treatment to up to 0.4 mg mL(-1) AuG0 NPs. Change in the absorption spectra of AuG0 NP in the mammalian cell culture media may indicate an alteration of NP properties that contributed to the low toxicity of AuG0 NPs in mammalian cells. For a safe development of PAMAM-based nanomaterials, the difference of sensitivity between mammalian and microbial cells, as well as the modulation of NPs toxicity by medium properties, should be taken into account when designing PAMAM NPs for applications that may lead to their introduction in the environment.
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Affiliation(s)
- François Perreault
- Laboratory of Environmental Toxicology, LABTOX, Department of Sanitary and Environment Engineering, Federal University of Santa Catarina, CEP 88040-970, Florianópolis, Santa Catarina, Brazil; Department of Chemistry, University of Quebec in Montreal, C.P. 8888, Succ. Centre-Ville, Montreal, Quebec, Canada, H3C 3P8
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Zhang DL, Hu CX, Li DH, Liu YD. Zebrafish locomotor capacity and brain acetylcholinesterase activity is altered by Aphanizomenon flos-aquae DC-1 aphantoxins. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2013; 138-139:139-149. [PMID: 23792258 DOI: 10.1016/j.aquatox.2013.04.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2013] [Revised: 04/20/2013] [Accepted: 04/22/2013] [Indexed: 06/02/2023]
Abstract
Aphanizomenon flos-aquae (A. flos-aquae) is a source of neurotoxins known as aphantoxins or paralytic shellfish poisons (PSPs) that present a major threat to the environment and to human health. Generally, altered neurological function is reflected in behavior. Although the molecular mechanism of action of PSPs is well known, its neurobehavioral effects on adult zebrafish and its relationship with altered neurological functions are poorly understood. Aphantoxins purified from a natural isolate of A. flos-aquae DC-1 were analyzed by HPLC. The major analogs found in the toxins were the gonyautoxins 1 and 5 (GTX1 and GTX5; 34.04% and 21.28%, respectively) and the neosaxitoxin (neoSTX, 12.77%). Zebrafish (Danio rerio) were intraperitoneally injected with 5.3 and 7.61 μg STXeq/kg (low and high dose, respectively) of A. flos-aquae DC-1 aphantoxins. The swimming activity was investigated by observation combined with video at 6 timepoints from 1 to 24 h post-exposure. Both aphantoxin doses were associated with delayed touch responses, reduced head-tail locomotory abilities, inflexible turning of head, and a tailward-shifted center of gravity. The normal S-pattern (or undulating) locomotor trajectory was replaced by a mechanical motor pattern of swinging the head after wagging the tail. Finally, these fish principally distributed at the top and/or bottom water of the aquarium, and showed a clear polarized distribution pattern at 12 h post-exposure. Further analysis of neurological function demonstrated that both aphantoxin doses inhibited brain acetylcholinesterase activity. All these changes were dose- and time-dependent. These results demonstrate that aphantoxins can alter locomotor capacity, touch responses and distribution patterns by damaging the cholinergic system of zebrafish, and suggest that zebrafish locomotor behavior and acetylcholinesterase can be used as indicators for investigating aphantoxins and blooms in nature.
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Affiliation(s)
- De Lu Zhang
- Department of Lifescience and Biotechnology, College of Science, Wuhan University of Technology, Wuhan 430070, PR China.
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Perreault F, Pedroso Melegari S, Henning da Costa C, de Oliveira Franco Rossetto AL, Popovic R, Gerson Matias W. Genotoxic effects of copper oxide nanoparticles in Neuro 2A cell cultures. THE SCIENCE OF THE TOTAL ENVIRONMENT 2012; 441:117-24. [PMID: 23137976 DOI: 10.1016/j.scitotenv.2012.09.065] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2012] [Revised: 09/25/2012] [Accepted: 09/25/2012] [Indexed: 05/21/2023]
Abstract
Copper oxide nanoparticles (CuO NPs) are used for their biocide potential however they were also shown to be highly toxic to mammalian cells. Therefore, the effects of CuO NPs should be carefully investigated to determine the most sensitive processes for CuO NP toxicity. In this study, the genotoxicity of CuO NPs was investigated in vitro, using the mouse neuroblastoma cell line Neuro-2A. Genotoxic effects related to DNA fragmentation, DNA methylation and chromosomal damage, as well as lipid peroxidation, were investigated and compared to cytotoxic effects, measured by the mitochondrial reduction of 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide into formazan. Based on mitochondrial activity, CuO NPs were found to be cytotoxic. At the highest concentration tested (400 mg l⁻¹), 63% of cell viability was found in Neuro-2A cells after 24 h of treatment to CuO NPs. CuO NPs were also found to induce DNA fragmentation, lipid peroxidation and micronucleus formation. The micronucleus assay was the most sensitive to evaluate CuO NP genotoxicity and micronucleus frequency was increased significantly at 12.5 mg l⁻¹ CuO NPs after 24h of treatment. At this concentration, no significant change of cell viability was found using the mitochondrial activity assay. These results highlight the important risk of genotoxic effects of CuO NPs and show that genotoxicity assays are a sensitive approach to evaluate the risk of CuO NP toxicity.
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Affiliation(s)
- François Perreault
- Laboratório de Toxicologia Ambiental, LABTOX-Depto. de Engenharia Sanitária e Ambiental, Universidade Federal de Santa Catarina, Campus Universitário, CEP: 88040-970, Florianópolis, SC, Brazil
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21
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Melegari SP, Perreault F, Moukha S, Popovic R, Creppy EE, Matias WG. Induction to oxidative stress by saxitoxin investigated through lipid peroxidation in Neuro 2A cells and Chlamydomonas reinhardtii alga. CHEMOSPHERE 2012; 89:38-43. [PMID: 22546629 DOI: 10.1016/j.chemosphere.2012.04.009] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2012] [Revised: 03/22/2012] [Accepted: 04/03/2012] [Indexed: 05/31/2023]
Abstract
Saxitoxin (STX) is a cyanotoxin, which can cause neurotoxic effects and induce ecological changes in aquatic environments, a potential risk to public and environmental health. Many studies of cytotoxicity on animal cells and algae have been performed, although few compare the toxic effects between the two models. In this sense, we investigated the oxidative stress induced by STX (0.4-3.0 nM) in two different cellular models: Neuro-2A (N2A) cells and Chlamydomonas reinhardtii alga by quantification of malondialdehyde (MDA) levels as indicative of lipid peroxidation (LPO). Also was evaluated the antioxidant defense of these cells systems after exposure to STX by the addition of antioxidants in N2A cells culture, and by the measure of antioxidants enzymes activity in C. reinhardtii cells. The MDA levels of N2A cells increased from 15% to 113% for 0.4 and 3.0 nM of STX, respectively, as compared to control. Superoxide-dismutase and catalase did not appear to protect the cell from STX effect while, in cells treated with vitamin E, the rates of MDA production decreased significantly, except for higher concentrations of STX. No MDA productions were observed in algal cells however some effects on antioxidant enzymes activity were observed when algae were exposed to 3.0 nM STX. Our results indicate that the concentrations of STX that may induce oxidative stress through LPO are different in animal and phytoplankton communities. A combination of algal and animal bioassays should be conducted for reliable assessment of oxidative stress induced by STX.
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Affiliation(s)
- Silvia P Melegari
- Laboratory of Environmental Toxicology, LABTOX, Department of Sanitary and Environmental Engineering, Campus Universitário Trindade, CEP 88040-970 Florianopolis, SC, Brazil
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Melegari SP, Matias WG. Preliminary assessment of the performance of oyster shells and chitin materials as adsorbents in the removal of saxitoxin in aqueous solutions. Chem Cent J 2012; 6:86. [PMID: 22892158 PMCID: PMC3533733 DOI: 10.1186/1752-153x-6-86] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2012] [Accepted: 08/02/2012] [Indexed: 11/25/2022] Open
Abstract
UNLABELLED BACKGROUND This study evaluated the adsorption capacity of the natural materials chitin and oyster shell powder (OSP) in the removal of saxitoxin (STX) from water. Simplified reactors of adsorption were prepared containing 200 mg of adsorbents and known concentrations of STX in solutions with pH 5.0 or 7.0, and these solutions were incubated at 25°C with an orbital shaker at 200 RPM. The adsorption isotherms were evaluated within 48 hours, with the results indicating a decrease in STX concentrations in different solutions (2-16 μg/L). The kinetics of adsorption was evaluated at different contact times (0-4320 min) with a decrease in STX concentrations (initial concentration of 10 μg/L). The sampling fractions were filtered through a membrane (0.20 μm) and analyzed with high performance liquid chromatography to quantify the STX concentration remaining in solution. RESULTS Chitin and OSP were found to be efficient adsorbents with a high capacity to remove STX from aqueous solutions within the concentration limits evaluated (> 50% over 18 h). The rate of STX removal for both adsorbents decreased with contact time, which was likely due to the saturation of the adsorbing sites and suggested that the adsorption occurred through ion exchange mechanisms. Our results also indicated that the adsorption equilibrium was influenced by pH and was not favored under acidic conditions. CONCLUSIONS The results of this study demonstrate the possibility of using these two materials in the treatment of drinking water contaminated with STX. The characteristics of chitin and OSP were consistent with the classical adsorption models of linear and Freundlich isotherms. Kinetic and thermodynamic evaluations revealed that the adsorption process was spontaneous (ΔGads < 0) and favorable and followed pseudo-second-order kinetics.
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Affiliation(s)
- Silvia P Melegari
- Laboratory of Environmental Toxicology (LABTOX), Department of Sanitary and Environmental Engineering, University Campus “Trindade”, Florianopolis, SC, CEP 88040-970, Brazil
| | - William G Matias
- Laboratory of Environmental Toxicology (LABTOX), Department of Sanitary and Environmental Engineering, University Campus “Trindade”, Florianopolis, SC, CEP 88040-970, Brazil
- Laboratório de Toxicologia Ambiental, LABTOX, Depto. de Engenharia Sanitária e Ambiental, Universidade Federal de Santa Catarina, Campus Universitário, CEP: 88040-970, Florianópolis, SC, Brasil
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Perreault F, Matias MS, Oukarroum A, Matias WG, Popovic R. Okadaic acid inhibits cell growth and photosynthetic electron transport in the alga Dunaliella tertiolecta. THE SCIENCE OF THE TOTAL ENVIRONMENT 2012; 414:198-204. [PMID: 22134032 DOI: 10.1016/j.scitotenv.2011.10.045] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2011] [Revised: 09/26/2011] [Accepted: 10/22/2011] [Indexed: 05/31/2023]
Abstract
Okadaic acid (OA), which is produced by several dinoflagellate species, is a phycotoxin known to induce a decrease of biomass production in phytoplankton. However, the mechanisms of OA cytotoxicity are still unknown in microalgae. In this study, we exposed the green microalga Dunaliella tertiolecta to OA concentrations of 0.05 to 0.5 μM in order to evaluate its effects on cell division, reactive oxygen species production and photosynthetic electron transport. After 72 h of treatment under continuous illumination, OA concentrations higher than 0.10 μM decreased culture cell density, induced oxidative stress and inhibited photosystem II electron transport capacity. OA effect in D. tertiolecta was strongly light dependent since no oxidative stress was observed when D. tertiolecta was exposed to OA in the dark. In the absence of light, the effect of OA on culture cell density and photosystem II activity was also significantly reduced. Therefore, light appears to have a significant role in the toxicity of OA in microalgae. Our results indicate that the site of OA interaction on photosynthetic electron transport is likely to be at the level of the plastoquinone pool, which can lead to photo-oxidative stress when light absorbed by the light-harvesting complex of photosystem II cannot be dissipated via photochemical pathways. These findings allowed for a better understanding of the mechanisms of OA toxicity in microalgae.
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Affiliation(s)
- François Perreault
- Department of Chemistry, Université du Québec à Montréal, 2101 Rue Jeanne Mance, Montréal, QC, Canada H2X 2J6
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