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Lin ZR, Geng HX, Yu RC. Potential roles of hydroxybenzoate paralytic shellfish toxins in modulating toxin biokinetics in scallops. JOURNAL OF HAZARDOUS MATERIALS 2024; 469:133896. [PMID: 38428300 DOI: 10.1016/j.jhazmat.2024.133896] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2023] [Revised: 02/06/2024] [Accepted: 02/24/2024] [Indexed: 03/03/2024]
Abstract
Paralytic shellfish toxins (PSTs) produced by some marine dinoflagellates can cause severe human intoxication via vectors like bivalves. Toxic dinoflagellate Gymnodinium catenatum produce a novel group of hydroxybenzoate PSTs named GC toxins, but their biokinetics in bivalves haven't been well examined. In this experiment, we analyzed PSTs in bay scallops Argopecten irradians exposed to G. catenatum (strain MEL11) to determine their accumulation, elimination, anatomical distribution, and biotransformation. To our surprise, up to 30% of the PSTs were accumulated in the adductor muscle of scallops at the end of the experiment, and the toxicity of adductor muscle exceeded the regulatory limit of 800 μg STXeq/kg in only 6 days. High concentration of toxins in the adductor muscle are likely linked to the rapid transfer of GC toxins from viscera to other tissues. Moreover, most GC toxins in scallops were found rapidly transformed to decarbamoyl toxins through enzyme-mediated hydrolysis, which was further supported by the in vitro incubation experiments. Our study demonstrates that GC toxins actively participate in toxin distribution and transformation in scallops, which may increase the risks of food poisoning associated with the consumption of scallop adductor muscle. ENVIRONMENTAL IMPLICATION: The negative impacts of harmful algal blooms (HABs) have become a global environmental concern under the joint effects of cultural eutrophication and climate change. Our study, targeted on the biokinetics of paralytic shellfish toxins in scallops exposed to Gymnodinium catenatum producing unique GC toxins, aims to elucidate potential risks of seafood poisoning associated with GC toxins. The findings of this study will help us to understand the roles of GC toxins in seafood poisoning, and to develop effective management strategies against toxic algal blooms and phycotoxins.
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Affiliation(s)
- Zhuo-Ru Lin
- CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; University of Chinese Academy of Sciences, Beijing 100039, China
| | - Hui-Xia Geng
- CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
| | - Ren-Cheng Yu
- CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; University of Chinese Academy of Sciences, Beijing 100039, China.
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Twenty-Five Years of PSP Toxicity in Galician (NW Spain) Bivalves: Spatial, Temporal, and Interspecific Variations. Toxins (Basel) 2022; 14:toxins14120837. [PMID: 36548735 PMCID: PMC9786697 DOI: 10.3390/toxins14120837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Revised: 11/08/2022] [Accepted: 11/24/2022] [Indexed: 12/04/2022] Open
Abstract
Twenty-five years of paralytic shellfish poisoning (PSP) toxicity in Galician bivalves have been studied. PSP was detected in 4785 out of 73,740 samples of the commercially important bivalve species analyzed from 1995 to 2020. Its general prevalence in the area was 6.5%. Only 1.6% of all samples tested were over the regulatory limit (incidence). The maximum level of PSP in the area, 40,800 µg STX 2HCl-eq kg-1, was recorded in raft mussels from Bueu (PON-II, Pontevedra) in December 2005. The highest maximum PSP values were found in mussels, which were mostly affected by Gymnodinium catenatum, but not those of prevalence and incidence which were recorded in clams, mostly affected by Alexandrium. Average levels in mussels were higher than in any other studied species. Spatially, in general, the prevalence, incidence, maximum, and average PSP toxicity during episodes tend to decrease from south to northeast, but some hot points with high levels can be identified. PCA analysis separates the southern rías, associated to G. catenatum blooms, from the middle and northern ones, associated to Alexandrium blooms. Along the year, two main peaks of the four variables are observed, the first one in late autumn-winter and the other in summer, the summer peak being much more important for the infaunal species than for raft mussels. In the seasonal pattern obtained by time series analysis of the average PSP toxicity, the autumn-winter peak was only maintained (and very reduced) in the southern rías, indicating that this peak is seasonally much less important than the summer peak. The observed seasonality is expected based on the timing of the blooms of the two PSP-producing phytoplankton groups present in the area. Over the 25 years of monitoring, large differences in PSP toxicity have been observed. Apart from some special years, an ascending trend in prevalence and incidence seems to be present from 2011 to 2020. No trend seems to exist during the same period for average or maximum toxicity.
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Aboualaalaa H, Rijal Leblad B, Hormat-Allah A, Savar V, Ennaskhi I, Hammi I, Elkbiach ML, Ibghi M, Maamour N, Medhioub W, Amzil Z, Laabir M. New insights into the dynamics of causative dinoflagellates and the related contamination of molluscs by paralytic toxins in the southwestern Mediterranean coastal waters of Morocco. MARINE POLLUTION BULLETIN 2022; 185:114349. [PMID: 36410198 DOI: 10.1016/j.marpolbul.2022.114349] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2022] [Revised: 11/03/2022] [Accepted: 11/06/2022] [Indexed: 06/16/2023]
Abstract
The distribution of the two potentially toxic dinoflagellates Gymnodinium catenatum and Alexandrium spp. was investigated in the Mediterranean Moroccan Sea from March 2018 to March 2019. The cockle Acanthocardia tuberculata and the smooth clam Callista chione were collected at four stations, and their toxin levels were assessed using the mouse bioassay. The toxin profile was analysed by LC-MS/MS in G. catenatum and in the bivalves harvested in M'diq and Djawn. The species G. catenatum was present throughout the year, whereas Alexandrium spp. was less abundant. The paralytic shellfish toxin (PST) level in cockles was, on average, six times above the sanitary threshold; GTX5 was the major contributor to the total PST level, followed by dc-STX and STX. The toxin level of the smooth clam was considerably lower than that of the cockle; GTX5 and C-toxins were the dominating analogues. Our results suggest the responsibility of G. catenatum for the recurrent PST contamination in the Moroccan Mediterranean Sea, with a west-east gradient.
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Affiliation(s)
- Hicham Aboualaalaa
- INRH (Moroccan Institute of Fisheries Research), Marine Environment Monitoring Laboratory, Tangier, Morocco; Equipe de Biotechnologie Végétale, Faculty of Sciences, Abdelmalek Essaadi University Tetouan, Morocco; Univ Montpelier, MARBEC CNRS, IRD, Ifremer, Montpellier, France
| | - Benlahcen Rijal Leblad
- INRH (Moroccan Institute of Fisheries Research), Marine Environment Monitoring Laboratory, Tangier, Morocco.
| | - Amal Hormat-Allah
- INRH (Moroccan Institute of Fisheries Research), Marine Environment Monitoring Laboratory, Tangier, Morocco
| | - Veronique Savar
- Ifremer (French Research Institute for Exploitation of the Sea), F-44311 Nantes Cedex 03, France
| | - Ismail Ennaskhi
- INRH (Moroccan Institute of Fisheries Research), Marine Environment Monitoring Laboratory, Tangier, Morocco
| | - Ikram Hammi
- INRH (Moroccan Institute of Fisheries Research), Marine Environment Monitoring Laboratory, Tangier, Morocco
| | - Mohamed L'Bachir Elkbiach
- Equipe de Biotechnologie Végétale, Faculty of Sciences, Abdelmalek Essaadi University Tetouan, Morocco
| | - Mustapha Ibghi
- INRH (Moroccan Institute of Fisheries Research), Marine Environment Monitoring Laboratory, Tangier, Morocco; Equipe de Biotechnologie Végétale, Faculty of Sciences, Abdelmalek Essaadi University Tetouan, Morocco; Univ Montpelier, MARBEC CNRS, IRD, Ifremer, Montpellier, France
| | - Niama Maamour
- INRH (Moroccan Institute of Fisheries Research), Marine Environment Monitoring Laboratory, Tangier, Morocco
| | - Walid Medhioub
- Aquaculture Laboratory, INSTM (National Institute of Marine Science and Technology), Monastir, Tunisia
| | - Zouher Amzil
- Ifremer (French Research Institute for Exploitation of the Sea), F-44311 Nantes Cedex 03, France
| | - Mohamed Laabir
- Univ Montpelier, MARBEC CNRS, IRD, Ifremer, Montpellier, France
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Lage S, Costa PR, Canário AVM, Da Silva JP. LC-HRMS Profiling of Paralytic Shellfish Toxins in Mytilus galloprovincialis after a Gymnodinium catenatum Bloom. Mar Drugs 2022; 20:680. [PMID: 36355003 PMCID: PMC9694030 DOI: 10.3390/md20110680] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Revised: 10/21/2022] [Accepted: 10/24/2022] [Indexed: 05/31/2024] Open
Abstract
Saxitoxin and its more than 50 analogues are a group of naturally occurring neurotoxins collectively designated as paralytic shellfish toxins (PSTs). PSTs are toxic to humans and maximum legal limits in seafood have been implemented by regulatory authorities worldwide. In the European Union, monitoring of PSTs is performed using the AOAC Official Method 2005.06, based on liquid chromatography coupled with fluorescence detection (LC- FLD). However, this method has been suggested to not effectively detect the emerging C-11 hydroxyl (M-toxins) and benzoate (GC-toxins) analogues, with these analogues currently not being surveyed in monitoring programs. In this study, a liquid chromatography-high resolution mass spectrometry (LC-HRMS) method was used to search for these emerging PSTs in mussels, Mytilus galloprovincialis, contaminated following an intense Gymnodinium catenatum bloom in the Tagus estuary (Lisbon, Portugal). Five M-toxins (M1, M2, M6, dcM6, and dcM10), but no GC-toxins, were detected in the mussels' whole-soft body tissue. Moreover, the classical PSTs (C1 to C4, GTX 4 to GTX6, dcGTX1 to dcGTX4, dcSTX, dcNEO, and STX) were also found and comprised the largest fraction of the PSTs' profile. The presence of unregulated PSTs in edible mussel samples suggests potential seafood safety risks and urges further research to determine the frequency of these analogues in seafood and their contribution to toxicity.
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Affiliation(s)
- Sandra Lage
- Centre of Marine Sciences (CCMAR/CIMAR LA), University of Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
| | - Pedro Reis Costa
- Centre of Marine Sciences (CCMAR/CIMAR LA), University of Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
- Portuguese Institute for the Sea and Atmosphere (IPMA), Av. Brasília, 1449-006 Lisbon, Portugal
| | - Adelino V. M. Canário
- Centre of Marine Sciences (CCMAR/CIMAR LA), University of Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
| | - José P. Da Silva
- Centre of Marine Sciences (CCMAR/CIMAR LA), University of Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
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Goya AB, Baqer D, Alexander RP, Stubbs P, Dean K, Lewis AM, Coates L, Maskrey BH, Turner AD. Marine Biotoxins in Whole and Processed Scallops from the Argentine Sea. Mar Drugs 2022; 20:634. [PMID: 36286458 PMCID: PMC9604692 DOI: 10.3390/md20100634] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Revised: 10/03/2022] [Accepted: 10/06/2022] [Indexed: 11/17/2022] Open
Abstract
Harmful algal blooms are an increasing worldwide threat to the seafood industry and human health as a consequence of the natural production of biotoxins that can accumulate in shellfish. In the Argentine Sea, this has been identified as an issue for the offshore fisheries of Patagonian scallops (Zygochlamys patagonica), leading to potentially harmful effects on consumers. Here we assess spatial and temporal patterns in marine biotoxin concentrations in Patagonian scallops harvested in Argentinian waters between 2012-2017, based on analyses for paralytic shellfish toxins, lipophilic toxins, and amnesic shellfish toxins. There was no evidence for concentrations of lipophilic or amnesic toxins above regulatory acceptance thresholds, with trace concentrations of pectenotoxin 2, azaspiracid 2 and okadaic acid group toxins confirmed. Conversely, paralytic shellfish toxins were quantified in some scallops. Gonyautoxins 1 and 2 dominated the unusual toxin profiles (91%) in terms of saxitoxin equivalents with maximum concentrations reaching 3985 µg STX eq/kg and with changes in profiles linked in part to seasonal changes. Total toxin concentrations were compared between samples of the adductor muscle and whole tissue, with results showing the absence of toxins in the adductor muscle confirming toxin accumulation in the digestive tracts of the scallops and the absence of a human health threat following the processing of scallop adductor meat. These findings highlight that paralytic shellfish toxins with an unusual toxin profile can occur in relatively high concentrations in whole Patagonian scallops in specific regions and during particular time periods, also showing that the processing of scallops on board factory ships to obtain frozen adductor muscle is an effective management process that minimizes the risk of poisonings from final products destined for human consumption.
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Affiliation(s)
- Alejandra B. Goya
- Marine Biotoxin Department, Mar del Plata Regional Laboratory, National Service for Agri-food Health and Quality (Senasa), AvisoDorrego y Víctimas del ‘46, Puerto, Mar del Plata B7600, Buenos Aires Province, Argentina
| | - Danial Baqer
- Centre for Environment, Fisheries and Aquaculture Science (Cefas), Barrack Road, The Nothe, Weymouth, Dorset DT4 8UB, UK
- Department of Biological Sciences, University of Surrey, Stag Hill, Guildford GU2 7XH, UK
| | - Ryan P. Alexander
- Centre for Environment, Fisheries and Aquaculture Science (Cefas), Barrack Road, The Nothe, Weymouth, Dorset DT4 8UB, UK
| | - Patrycja Stubbs
- Centre for Environment, Fisheries and Aquaculture Science (Cefas), Barrack Road, The Nothe, Weymouth, Dorset DT4 8UB, UK
| | - Karl Dean
- Centre for Environment, Fisheries and Aquaculture Science (Cefas), Barrack Road, The Nothe, Weymouth, Dorset DT4 8UB, UK
| | - Adam M. Lewis
- Centre for Environment, Fisheries and Aquaculture Science (Cefas), Barrack Road, The Nothe, Weymouth, Dorset DT4 8UB, UK
| | - Lewis Coates
- Centre for Environment, Fisheries and Aquaculture Science (Cefas), Barrack Road, The Nothe, Weymouth, Dorset DT4 8UB, UK
| | - Benjamin H. Maskrey
- Centre for Environment, Fisheries and Aquaculture Science (Cefas), Barrack Road, The Nothe, Weymouth, Dorset DT4 8UB, UK
| | - Andrew D. Turner
- Centre for Environment, Fisheries and Aquaculture Science (Cefas), Barrack Road, The Nothe, Weymouth, Dorset DT4 8UB, UK
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Lewis AM, Dean KJ, Hartnell DM, Percy L, Turner AD, Lewis JM. The value of toxin profiles in the chemotaxonomic analysis of paralytic shellfish toxins in determining the relationship between British Alexandrium spp. and experimentally contaminated Mytilus sp. HARMFUL ALGAE 2022; 111:102131. [PMID: 35016773 DOI: 10.1016/j.hal.2021.102131] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2021] [Revised: 10/23/2021] [Accepted: 11/02/2021] [Indexed: 06/14/2023]
Abstract
Although phytoplankton is ubiquitous in the world's oceans some species can produce compounds that cause damaging effects in other organisms. These include the toxins responsible for paralytic shellfish poisoning, which, in UK waters, are produced by dinoflagellates from the Alexandrium genus. Within Great Britain (GB) a monitoring programme exists to detect this harmful genus as well as the Paralytic Shellfish Poisoning (PSP) toxins in the flesh of shellfish from classified production areas. The techniques used for toxin analysis allow for detailed analysis of the toxin profiles present in contaminated shellfish. It is possible to compare the toxin profiles of contaminated shellfish with the profiles from toxin producing algae and use this information to infer the causative microalgal species responsible for the contamination. This study sought to evaluate the potential for this process within the GB monitoring framework. Two species of toxic Alexandrium, A. catenella from Scotland and A. minutum from Southern England, were fed to mussels (Mytilus sp.) under controlled conditions. The toxin profile in mussels derived from feeding on each species independently, when mixed and when introduced sequentially was analysed and compared to the source algal cultures using K means cluster analysis. Toxin profiles in contaminated shellfish clustered with those of the causative algae and separately from one another during toxin accumulation and, where A. catenella was the sole toxin source, during depuration. During depuration after feeding with A. minutum and where mixed or sequential feeding was undertaken deviant toxin profiles were observed. Finally, data generated within this experimental study were compared to monitoring data from the GB official control programme. These data indicated that the causative algal species in sole source contaminations could be inferred from toxin profile analysis. This technique will be of benefit within monitoring programmes to enhance the value of data with minimal additional expense, where the toxin profiles of causative microalgae have been well described.
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Affiliation(s)
- Adam M Lewis
- Cefas, The Nothe, Barrack Road, Weymouth, Dorset, UK, DT48UB; School of Life Sciences, The University of Westminster, 115 New Cavendish Street, London W1W6UW UK.
| | - Karl J Dean
- Cefas, The Nothe, Barrack Road, Weymouth, Dorset, UK, DT48UB
| | | | - Linda Percy
- School of Life Sciences, The University of Westminster, 115 New Cavendish Street, London W1W6UW UK
| | - Andrew D Turner
- Cefas, The Nothe, Barrack Road, Weymouth, Dorset, UK, DT48UB
| | - Jane M Lewis
- Principal Shetland College, Shetland College, University of Highlands and Islands, Gremista, Lerwick, Shetland ZE1 0PX UK
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Boundy MJ, Harwood DT, Tommasi E, Burger E, van Ginkel R, Waugh C, Selwood AI, Finch S. Acute toxicity of decarbamoyl gonyautoxin 1&4 to mice by various routes of administration. Toxicon 2021; 204:56-63. [PMID: 34742781 DOI: 10.1016/j.toxicon.2021.11.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Revised: 10/08/2021] [Accepted: 11/02/2021] [Indexed: 11/16/2022]
Abstract
Saxitoxin and its derivatives, the paralytic shellfish toxins (PSTs), are well known to be toxic to humans, and maximum permitted levels in seafood have been established by regulatory authorities in many countries. Monitoring of PSTs is typically performed using chemical methods which quantify the concentration of the individual PST analogues, of which there are many. However, since the toxicities of analogues are different, they do not equally contribute to the overall toxicity of the sample. To account for these differences, toxicity equivalency factors (TEFs) need to be determined for each analogue and applied. Currently there are no established TEFs for decarbamoyl gonyautoxin 1&4 (dcGTX1&4), which occurs in some clam species such as Mactra chinensis contaminated with PSTs due to metabolism within the shellfish. In this study the median lethal dose of purified, equilibrated epimeric mixture of dcGTX1&4 has been determined by intraperitoneal injection (i.p.) (4.75 μmol/kg) and by feeding (34.9 μmol/kg). The most relevant route of exposure is orally with feeding being more representative of human consumption and more reliable than gavage. Based on the median lethal dose by feeding, a TEF of 0.1 is recommended for dcGTX1&4. Receptor binding activity and i.p. toxicity results showed dcGTX1&4 to be much less toxic than STX (140-170-fold). However, by feeding a much smaller difference in toxicity was observed with dcGTX1&4 being only 11-fold less toxic than STX. Analysis of the gut contents of mice dosed with dcGTX1&4 showed the presence of decarbamoyl gonyautoxin 2&3, decarbamoyl saxitoxin and decarbamoyl neosaxitoxin, all of which are of greater toxicity. This conversion of dcGTX1&4 within the digestive track to more toxic congeners may explain the high relative toxicity of dcGTX1&4 by feeding compared to that determined by i.p. and by sodium channel activity.
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Affiliation(s)
| | - D Tim Harwood
- Cawthron Institute, Private Bag 2, Nelson, 7042, New Zealand
| | - Elena Tommasi
- Cawthron Institute, Private Bag 2, Nelson, 7042, New Zealand
| | - Emillie Burger
- Cawthron Institute, Private Bag 2, Nelson, 7042, New Zealand
| | - Roel van Ginkel
- Cawthron Institute, Private Bag 2, Nelson, 7042, New Zealand
| | - Craig Waugh
- Cawthron Institute, Private Bag 2, Nelson, 7042, New Zealand
| | | | - Sarah Finch
- AgResearch Limited, Ruakura Research Centre, Private Bag 3123, Hamilton, 3240, New Zealand
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Dusek RJ, Smith MM, Van Hemert C, Shearn-Bochsler VI, Hall S, Ridge CD, Hardison DR, Kaler RSA, Bodenstein BL, Hofmeister EK, Hall JS. Acute oral toxicity and tissue residues of saxitoxin in the mallard (Anas platyrhynchos). HARMFUL ALGAE 2021; 109:102109. [PMID: 34815022 DOI: 10.1016/j.hal.2021.102109] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Revised: 09/16/2021] [Accepted: 09/20/2021] [Indexed: 06/13/2023]
Abstract
Since 2014, widespread, annual mortality events involving multiple species of seabirds have occurred in the Gulf of Alaska, Bering Sea, and Chukchi Sea. Among these die-offs, emaciation was a common finding with starvation often identified as the cause of death. However, saxitoxin (STX) was detected in many carcasses, indicating exposure of these seabirds to STX in the marine environment. Few data are available that describe the effects of STX in birds, thus presenting challenges for determining its contributions to specific mortality events. To address these knowledge gaps, we conducted an acute oral toxicity trial in mallards (Anas platyrhynchos), a common laboratory avian model, using an up-and-down method to estimate the median lethal dose (LD50) for STX. Using an enzyme-linked immunosorbent assay (ELISA), we tested select tissues from all birds and feces from those individuals that survived initial dosing. Samples with an ELISA result that exceeded approximately 10 µg 100 g-1 STX and randomly selected ELISA negative samples were further tested by high-performance liquid chromatography (HPLC). Tissues collected from mallards were also examined grossly at necropsy and then later by microscopy to identify lesions attributable to STX. The estimated LD50 was 167 µg kg-1 (95% CI = 69-275 µg kg-1). Saxitoxin was detected in fecal samples of all mallards tested for up to 48 h after dosing and at the end of the sampling period (7 d) in three birds. In those individuals that died or were euthanized <2 h after dosing, STX was readily detected throughout the gastrointestinal tract but only infrequently in heart, kidney, liver, lung, and breast muscle. No gross or microscopic lesions were observed that could be attributable to STX exposure. Given its acute toxicity, limited detectability, and frequent occurrence in the Alaska marine environment, additional research on STX in seabirds is warranted.
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Affiliation(s)
- Robert J Dusek
- U.S. Geological Survey, National Wildlife Health Center, 6006 Schroeder Road, Madison, WI 53711, United States.
| | - Matthew M Smith
- U.S. Geological Survey, Alaska Science Center, 4210 University Drive, Anchorage, AK 99508, United States.
| | - Caroline Van Hemert
- U.S. Geological Survey, Alaska Science Center, 4210 University Drive, Anchorage, AK 99508, United States.
| | - Valerie I Shearn-Bochsler
- U.S. Geological Survey, National Wildlife Health Center, 6006 Schroeder Road, Madison, WI 53711, United States.
| | - Sherwood Hall
- U.S. Food and Drug Administration, Center for Food Safety and Applied Nutrition, 5001 Campus Drive, College Park, MD 20740, United States.
| | - Clark D Ridge
- U.S. Food and Drug Administration, Center for Food Safety and Applied Nutrition, 5001 Campus Drive, College Park, MD 20740, United States.
| | - D Ransom Hardison
- National Oceanic and Atmospheric Administration, National Centers for Coastal Ocean Science, 101 Pivers Island Road, Beaufort, NC 28516, United States.
| | - Robb S A Kaler
- U.S. Fish and Wildlife Service, Division of Migratory Bird Management, 1011 East Tudor Road, Anchorage, AK 99503, United States.
| | - Barbara L Bodenstein
- U.S. Geological Survey, National Wildlife Health Center, 6006 Schroeder Road, Madison, WI 53711, United States.
| | - Erik K Hofmeister
- U.S. Geological Survey, National Wildlife Health Center, 6006 Schroeder Road, Madison, WI 53711, United States.
| | - Jeffrey S Hall
- U.S. Geological Survey, National Wildlife Health Center, 6006 Schroeder Road, Madison, WI 53711, United States.
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Leal JF, Cristiano MLS. Marine paralytic shellfish toxins: chemical properties, mode of action, newer analogues, and structure-toxicity relationship. Nat Prod Rep 2021; 39:33-57. [PMID: 34190283 DOI: 10.1039/d1np00009h] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Up to the end of 2020Every year, the appearance of marine biotoxins causes enormous socio-economic damage worldwide. Among the major groups of biotoxins, paralytic shellfish toxins, comprising saxitoxin and its analogues (STXs), are the ones that cause the most severe effects on humans, including death. However, the knowledge that currently exists on their chemistry, properties and mode of toxicological action is disperse and partially outdated. This review intends to systematically compile the dispersed information, updating and complementing it. With this purpose, it addresses several aspects related to the molecular structure of these toxins. Special focus is given to the bioconversion reactions that may occur in the different organisms (dinoflagellates, bivalves, and humans) and the possible mediators involved. A critical review of the most recently discovered analogues, the M-series toxins, is presented. Finally, a deep discussion about the relationship between the molecular structure (e.g., effect of the substituting groups and the net charge of the molecules) and the toxic activity of these molecules is performed, proposing the concept of "toxicological traffic light" based on the toxicity equivalency factors (TEFs).
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Affiliation(s)
- Joana F Leal
- Centre of Marine Sciences (CCMAR), Department of Chemistry and Pharmacy, Faculty of Science and Technology, University of Algarve, Campus de Gambelas, 8005-139 Faro, Portugal.
| | - Maria L S Cristiano
- Centre of Marine Sciences (CCMAR), Department of Chemistry and Pharmacy, Faculty of Science and Technology, University of Algarve, Campus de Gambelas, 8005-139 Faro, Portugal.
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10
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Goya AB, Tarnovius S, Hatfield RG, Coates L, Lewis AM, Turner AD. Paralytic shellfish toxins and associated toxin profiles in bivalve mollusc shellfish from Argentina. HARMFUL ALGAE 2020; 99:101910. [PMID: 33218436 DOI: 10.1016/j.hal.2020.101910] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Revised: 09/11/2020] [Accepted: 09/29/2020] [Indexed: 06/11/2023]
Abstract
Paralytic Shellfish Poisoning is a potentially fatal syndrome, resulting from the filter-feeding activities of marine molluscs accumulating harmful neurotoxins naturally occurring in microalgae. Outbreaks are well recognised throughout most regions of the world, but with the highest levels of toxicity to date recorded in mussels from Argentina. Whilst toxicity has been documented for selected outbreaks over the years, testing has been conducted using a mouse bioassay. Consequently there is a need to establish baseline data utilising modern chemical detection methods, which also facilitate the quantification of individual toxin analogues, giving useful data on toxin profiles as well as total sample toxicity. In this study, 151 shellfish samples harvested from the marine waters of Argentina between 1980 and 2012 were subjected to analysis by liquid chromatography with fluorescence detection, since Jan 2019 the European Union reference method for PSP determination. Total PST concentrations were found to vary enormously throughout the coastline of Argentina, with higher levels of toxins found in the central regions of Rio Negro and Chubut. Toxin profiles in terms of molar percentage of total concentrations were dominated by the gonyautoxins GTX1&4 and GTX2&3, followed by C1&2, STX and dcGTX2&3, with minor levels of other analogues previously not reported in the country. Profiles were found to vary significantly, with statistical clusters of profile types associated with a wide range of factors, including species, spatial and temporal differences, as well as likely source microalgae species and potential toxin transformation pathways. Overall application of the chemical detection method has confirmed both the significant risk to shellfish consumers in Argentina with periodic outbreaks of extremely high toxin levels and a large variability in toxin profiles relating in part to previously reported variabilities in microalgal toxin content. The study has demonstrated the potential for the method to systematically study the relationships between toxicity, toxin profile, source phytoplankton and other environmental factors.
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Affiliation(s)
- Alejandra B Goya
- Marine Biotoxin Department, Mar del Plata Regional Laboratory, Agri-food Health and Quality National Service (SENASA)
| | - Sophie Tarnovius
- Technische Universität München, Walther-Meißner-Straße 3, 85748 Garching, German; Centre for Environment, Fisheries and Aquaculture Science (Cefas), Barrack Road, The Nothe, Weymouth, Dorset, DT4 8UB, United Kingdom
| | - Robert G Hatfield
- Centre for Environment, Fisheries and Aquaculture Science (Cefas), Barrack Road, The Nothe, Weymouth, Dorset, DT4 8UB, United Kingdom
| | - Lewis Coates
- Centre for Environment, Fisheries and Aquaculture Science (Cefas), Barrack Road, The Nothe, Weymouth, Dorset, DT4 8UB, United Kingdom
| | - Adam M Lewis
- Centre for Environment, Fisheries and Aquaculture Science (Cefas), Barrack Road, The Nothe, Weymouth, Dorset, DT4 8UB, United Kingdom
| | - Andrew D Turner
- Centre for Environment, Fisheries and Aquaculture Science (Cefas), Barrack Road, The Nothe, Weymouth, Dorset, DT4 8UB, United Kingdom.
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11
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Freitas R, Marques F, De Marchi L, Vale C, Botelho MJ. Biochemical performance of mussels, cockles and razor shells contaminated by paralytic shellfish toxins. ENVIRONMENTAL RESEARCH 2020; 188:109846. [PMID: 32846638 DOI: 10.1016/j.envres.2020.109846] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Revised: 05/12/2020] [Accepted: 06/16/2020] [Indexed: 06/11/2023]
Abstract
Marine toxins in bivalves pose an important risk to human health, and regulatory authorities throughout the world impose maximum toxicity values. In general, bivalve toxicities due to paralytic shellfish toxins (PSTs) above the regulatory limit occur during short periods, but in some cases, it may be extended from weeks to months. The present study examines whether cockles (Cerastoderme edule), mussels (Mytilus galloprovincialis) and razor shells (Solen marginatus) naturally exposed to a bloom of Gymnodinium catenatum activated or suppressed biochemical responses as result of the presence of PSTs in their soft tissues. Toxins (C1+2, C3+4, GTX5, GTX6, dcSTX, dcGTX2+3 and dcNEO) and a set of biomarkers (ETS, electron transport system activity; GLY, glycogen; PROT, protein; SOD, superoxide dismutase; CAT, catalase; GPx, glutathione peroxidase; GST, glutathione S-transferases; LPO, lipid peroxidation; reduced (GSH) and oxidized (GSSG) glutathione contents and AChE, acetylcholinesterase activity) were determined in the three bivalve species. Specimens were harvested weekly in Aveiro lagoon, Portugal, along thirteen weeks. This period included three weeks in which bivalve toxicity exceeded largely the regulatory limit and the subsequence recovery period of ten weeks. Biochemical performance of the surveyed species clearly indicated that PSTs induce oxidative stress and neurotoxicity, with higher impact on mussels and razor shells than in cockles. The antioxidant enzymes CAT and GPx seemed to be the biomarkers better associated with toxin effects.
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Affiliation(s)
- Rosa Freitas
- Department of Biology & Center for Environmental and Marine Studies (CESAM), University of Aveiro, 3810-193 Aveiro, Portugal
| | - Filipa Marques
- IPMA, Portuguese Institute for Sea and Atmosphere, Rua Alfredo Magalhães Ramalho, 6, 1495-006 Lisbon, Portugal; CIIMAR, Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Avenida Norton de Matos, 4450-208 Matosinhos, Portugal
| | - Lucia De Marchi
- Department of Biology & Center for Environmental and Marine Studies (CESAM), University of Aveiro, 3810-193 Aveiro, Portugal
| | - Carlos Vale
- CIIMAR, Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Avenida Norton de Matos, 4450-208 Matosinhos, Portugal
| | - Maria João Botelho
- IPMA, Portuguese Institute for Sea and Atmosphere, Rua Alfredo Magalhães Ramalho, 6, 1495-006 Lisbon, Portugal; CIIMAR, Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Avenida Norton de Matos, 4450-208 Matosinhos, Portugal.
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12
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Raposo MIC, Gomes MTSR, Botelho MJ, Rudnitskaya A. Paralytic Shellfish Toxins (PST)-Transforming Enzymes: A Review. Toxins (Basel) 2020; 12:E344. [PMID: 32456077 PMCID: PMC7290730 DOI: 10.3390/toxins12050344] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Revised: 05/16/2020] [Accepted: 05/20/2020] [Indexed: 01/13/2023] Open
Abstract
Paralytic shellfish toxins (PSTs) are a group of toxins that cause paralytic shellfish poisoning through blockage of voltage-gated sodium channels. PSTs are produced by prokaryotic freshwater cyanobacteria and eukaryotic marine dinoflagellates. Proliferation of toxic algae species can lead to harmful algal blooms, during which seafood accumulate high levels of PSTs, posing a health threat to consumers. The existence of PST-transforming enzymes was first remarked due to the divergence of PST profiles and concentrations between contaminated bivalves and toxigenic organisms. Later, several enzymes involved in PST transformation, synthesis and elimination have been identified. The knowledge of PST-transforming enzymes is necessary for understanding the processes of toxin accumulation and depuration in mollusk bivalves. Furthermore, PST-transforming enzymes facilitate the obtainment of pure analogues of toxins as in natural sources they are present in a mixture. Pure compounds are of interest for the development of drug candidates and as analytical reference materials. PST-transforming enzymes can also be employed for the development of analytical tools for toxin detection. This review summarizes the PST-transforming enzymes identified so far in living organisms from bacteria to humans, with special emphasis on bivalves, cyanobacteria and dinoflagellates, and discusses enzymes' biological functions and potential practical applications.
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Affiliation(s)
- Mariana I. C. Raposo
- CESAM and Chemistry Department, University of Aveiro, 3810-193 Aveiro, Portugal; (M.I.C.R.); (M.T.S.R.G.)
| | - Maria Teresa S. R. Gomes
- CESAM and Chemistry Department, University of Aveiro, 3810-193 Aveiro, Portugal; (M.I.C.R.); (M.T.S.R.G.)
| | - Maria João Botelho
- Portuguese Institute for the Sea and Atmosphere, 1449-006 Lisbon, Portugal;
- Interdisciplinary Centre of Marine and Environmental Research, University of Porto, 4050-123 Porto, Portugal
| | - Alisa Rudnitskaya
- CESAM and Chemistry Department, University of Aveiro, 3810-193 Aveiro, Portugal; (M.I.C.R.); (M.T.S.R.G.)
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13
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Turnbull A, Malhi N, Seger A, Harwood T, Jolley J, Fitzgibbon Q, Hallegraeff G. Paralytic shellfish toxin uptake, tissue distribution, and depuration in the Southern Rock Lobster Jasus edwardsii Hutton. HARMFUL ALGAE 2020; 95:101818. [PMID: 32439058 DOI: 10.1016/j.hal.2020.101818] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Revised: 03/25/2020] [Accepted: 04/13/2020] [Indexed: 06/11/2023]
Abstract
Up to 13.6 mg STX.2HCl equiv. kg-1 of paralytic shellfish toxins (PST) have been found in the hepatopancreas of Southern Rock Lobster, Jasus edwardsii, on the east coast of Tasmania. Blooms of the toxic dinoflagellate Alexandrium catenella have been reported in this region since 2012. Experimental work was undertaken to improve the understanding of the uptake and depuration mechanisms involved. Adult male lobsters were fed highly toxic mussels (6 mg STX.2HCl equiv. kg-1) sourced from the impacted area. The apparent feed intake of the lobster was positively correlated to increasing PST levels in the hepatopancreas. Toxins accumulated rapidly in the hepatopancreas reaching a maximum of 9.0 mg STX.2HCl equiv. kg-1, then depurated at a rate of 7% per day once toxic fed was removed. However, PST were not detected at significant levels in the haemolymph of these animals. Notable increases occurred in the relative amount of several PST analogues in the hepatopancreas, including GTX2&3, C1&2 and several decarbomoyl toxins in comparison to the profile observed in contaminated mussel feed. The concentration of PST in lobster antennal glands was two orders of magnitude lower than concentrations found in the hepatopancreas. This is the first report of PST in lobster antennal glands which, along with the gills, represent possible excretion routes for PST. Implications for biotoxin risk monitoring are: lobsters will continue to feed during bloom periods and high concentrations of PST can occur; animal collection should be frequent at the start of a bloom in case of a rapid accumulation of PST; and non-lethal sampling is not possible as haemolymph PST levels do not reflect what is in the hepatopancreas.
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Affiliation(s)
- Alison Turnbull
- South Australian Research and Development Institute, GPO Box 397, Adelaide, South Australia 5001, Australia; Institute for Marine and Antarctic Studies, University of Tasmania, Private Bag 129, Hobart, Tasmania, Australia.
| | - Navreet Malhi
- South Australian Research and Development Institute, GPO Box 397, Adelaide, South Australia 5001, Australia
| | - Andreas Seger
- South Australian Research and Development Institute, GPO Box 397, Adelaide, South Australia 5001, Australia
| | - Tim Harwood
- Cawthron Institute, 98 Halifax St East, Nelson 7010, New Zealand
| | - Jessica Jolley
- South Australian Research and Development Institute, GPO Box 397, Adelaide, South Australia 5001, Australia
| | - Quinn Fitzgibbon
- Institute for Marine and Antarctic Studies, University of Tasmania, Private Bag 129, Hobart, Tasmania, Australia
| | - Gustaaf Hallegraeff
- Institute for Marine and Antarctic Studies, University of Tasmania, Private Bag 129, Hobart, Tasmania, Australia
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14
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Botelho MJ, Marques F, Freitas R, Pires A, Pereira E, Vale C. Paralytic shellfish toxin profiles in mussel, cockle and razor shell under post-bloom natural conditions: Evidence of higher biotransformation in razor shells and cockles. MARINE ENVIRONMENTAL RESEARCH 2020; 154:104839. [PMID: 31757480 DOI: 10.1016/j.marenvres.2019.104839] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2019] [Revised: 10/23/2019] [Accepted: 11/07/2019] [Indexed: 06/10/2023]
Abstract
Concentrations of the paralytic shellfish toxins GTX6, C1+2, GTX5, C3+4, dcSTX, dcNEO and dcGTX2+3 were determined by LC-FLD in composite samples of whole soft tissues of mussels (Mytilus galloprovincialis), cockles (Cerastoderma edule) and razor shells (Solen marginatus) after exposure to a Gymnodinium catenatum bloom. Specimens were harvested weekly during three months under natural depuration conditions in the Mira branch of Aveiro lagoon, Portugal. Under the decline of G. catenatum cell densities, elimination or transformation of the uptake toxins associated with the ingestion of toxic cells differed among the surveyed species. Ratio between the toxins dcSTX plus dcGTX2+3 plus dcNEO and toxins GTX6 plus GTX5 plus C1+2 plus C3+4 was used to illustrate the biotransformation occurring in the bivalves. Enhancement of the ratios was observed for razor shells and cockles seven weeks after the peak of the algal bloom. Most likely it reflects more intense biotransformation in razor shells and cockles than in mussels. Conversion into toxins of higher toxicity may prolong the bivalve toxicity. These results show the complexity of toxin elimination in bivalves under post-bloom conditions and emphasize the pertinence of monitoring programs of bivalve toxicity in order to protect human health.
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Affiliation(s)
- Maria João Botelho
- IPMA, Portuguese Institute for the Sea and Atmosphere, Rua Alfredo Magalhães Ramalho, 6, 1495-006, Lisbon, Portugal; CIIMAR, Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Avenida Norton de Matos, 4450-208, Matosinhos, Portugal.
| | - Filipa Marques
- IPMA, Portuguese Institute for the Sea and Atmosphere, Rua Alfredo Magalhães Ramalho, 6, 1495-006, Lisbon, Portugal
| | - Rosa Freitas
- Department of Biology & Center for Environmental and Marine Studies (CESAM), 3810-193, Aveiro, Portugal
| | - Adília Pires
- Department of Biology & Center for Environmental and Marine Studies (CESAM), 3810-193, Aveiro, Portugal
| | - Eduarda Pereira
- Department of Chemistry & Center for Environmental and Marine Studies (CESAM), 3810-193, Aveiro, Portugal
| | - Carlos Vale
- CIIMAR, Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Avenida Norton de Matos, 4450-208, Matosinhos, Portugal
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15
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Botelho MJ, Vale C, Ferreira JG. Seasonal and multi-annual trends of bivalve toxicity by PSTs in Portuguese marine waters. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 664:1095-1106. [PMID: 30901783 DOI: 10.1016/j.scitotenv.2019.01.314] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Revised: 01/23/2019] [Accepted: 01/24/2019] [Indexed: 06/09/2023]
Abstract
Temporal and spatial trends of paralytic shellfish toxins (PSTs) in bivalves from Portuguese estuarine and coastal waters, and connectivity of bivalve toxicity among the harvest areas, were examined using long-term data from the national biotoxin monitoring programme. Data from 1994 to 2017 were chosen for commercial bivalve species sensitive to PSTs, and for production areas exhibiting recurrent episodes of bivalve toxicity. Mussels (Mytilus spp.) and cockles (Cerastoderma edule) from the Ria de Aveiro, Mondego estuary, Óbidos lagoon and Ria Formosa, and wedge clams (Donax trunculus) and surf clams (Spisula solida) from the coastal areas Aguda and Olhão were selected. Bivalve toxicity data point to higher incidents of PST episodes in autumn and winter, although in 2008 the toxicity of mussels and cockles in the three estuarine areas was registered in summer. Most likely, favourable oceanographic conditions triggered the bloom formation of Gymnodinium catenatum, which is the species responsible for paralytic shellfish poisoning in Portuguese waters. Episodes in the southern coast of Portugal were less recurrent, although values above the PST regulatory limit displayed also a seasonal signal with a peak between autumn and early winter. On the basis of the number of weeks per month that bivalves showed elevated toxicity values, a connectivity index was defined for the surveyed areas. High connectivity was obtained among Aveiro, Mondego and Óbidos, which are 180 km apart, suggesting that G. catenatum cells are imported from blooms formed or reaching the coastal waters adjacent to these systems. During episodes of elevated toxicity, toxin profiles in contaminated mussels and cockles were dominated by N-sulfocarbamoyl compounds, which are the major toxins produced by the toxic dinoflagellate G. catenatum. The identification of coupled systems relatively to bivalve toxicity has an impact on monitoring programmes and allows improved decision-making on closures of bivalve harvest areas affected by toxic algae.
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Affiliation(s)
- Maria João Botelho
- IPMA, Portuguese Institute for the Sea and Atmosphere, Rua Alfredo Magalhães Ramalho, 6, 1495-006 Lisbon, Portugal.
| | - Carlos Vale
- CIIMAR, Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Avenida Norton de Matos, 4450-208 Matosinhos, Portugal
| | - João G Ferreira
- Department of Environmental Sciences and Engineering, FCT-UNL, 2829-516 Monte de Caparica, Portugal
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16
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Turner AD, Hatfield RG, Maskrey BH, Algoet M, Lawrence JF. Evaluation of the new European Union reference method for paralytic shellfish toxins in shellfish: A review of twelve years regulatory monitoring using pre-column oxidation LC-FLD. Trends Analyt Chem 2019. [DOI: 10.1016/j.trac.2019.02.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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17
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Álvarez G, Díaz PA, Godoy M, Araya M, Ganuza I, Pino R, Álvarez F, Rengel J, Hernández C, Uribe E, Blanco J. Paralytic Shellfish Toxins in Surf Clams Mesodesma donacium during a Large Bloom of Alexandrium catenella Dinoflagellates Associated to an Intense Shellfish Mass Mortality. Toxins (Basel) 2019; 11:toxins11040188. [PMID: 30934869 PMCID: PMC6520680 DOI: 10.3390/toxins11040188] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Revised: 03/26/2019] [Accepted: 03/27/2019] [Indexed: 01/05/2023] Open
Abstract
In late February 2016, a harmful algal bloom (HAB) of Alexandrium catenella was detected in southern Chiloé, leading to the banning of shellfish harvesting in an extended geographical area (~500 km). On April 24, 2016, this bloom produced a massive beaching (an accumulation on the beach surface of dead or impaired organisms which were drifted ashore) of surf clams Mesodesma donacium in Cucao Bay, Chiloé. To determine the effect of paralytic shellfish poisoning (PSP) toxins in M. donacium, samples were taken from Cucao during the third massive beaching detected on May 3, 2016. Whole tissue toxicity evidence a high interindividual variability with values which ranged from 1008 to 8763 μg STX eq 100 g−1 and with a toxin profile dominated by GTX3, GTX1, GTX2, GTX4, and neoSTX. Individuals were dissected into digestive gland (DG), foot (FT), adductor muscle (MU), and other body fractions (OBF), and histopathological and toxin analyses were carried out on the obtained fractions. Some pathological conditions were observed in gill and digestive gland of 40–50% of the individuals that correspond to hemocyte aggregation and haemocytic infiltration, respectively. The most toxic tissue was DG (2221 μg STX eq 100 g−1), followed by OBF (710 μg STX eq 100 g−1), FT (297 μg STX eq 100 g−1), and MU (314 μg STX eq 100 g−1). The observed surf clam mortality seems to have been mainly due to the desiccation caused by the incapability of the clams to burrow. Considering the available information of the monitoring program and taking into account that this episode was the first detected along the open coast of the Pacific Ocean in southern Chiloé, it is very likely that the M. donacium population from Cucao Bay has not had a recurrent exposition to A. catenella and, consequently, that it has not been subjected to high selective pressure for PSP resistance. However, more research is needed to determine the effects of PSP toxins on behavioral and physiological responses, nerve sensitivity, and genetic/molecular basis for the resistance or sensitivity of M. donacium.
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Affiliation(s)
- Gonzalo Álvarez
- Facultad de Ciencias del Mar, Departamento de Acuicultura, Universidad Católica del Norte, Larrondo 1281, Coquimbo 1781421, Chile.
- Centro de Investigación y Desarrollo Tecnológico en Algas (CIDTA), Facultad de Ciencias del Mar, Universidad Católica del Norte, Larrondo 1281, Coquimbo, Chile.
| | - Patricio A Díaz
- Centro i∼mar & CeBiB, Universidad de Los Lagos, Casilla 557, Puerto Montt 5480000, Chile.
| | - Marcos Godoy
- Laboratorio de Biotecnología Aplicada, Facultad de Ciencias Veterinarias, Universidad San Sebastián, Lago Panguipulli 1390, Puerto Montt 5501842, Chile.
- Centro de Investigaciones Biológicas Aplicadas (CIBA), Diego de Almagro 1013, Puerto Montt 5507964, Chile.
- Doctorado en Acuicultura, Programa Cooperativo Universidad de Chile, Universidad Católica del Norte, Pontificia Universidad Católica de Valparaíso, Coquimbo 17811421, Chile.
| | - Michael Araya
- Centro de Investigación y Desarrollo Tecnológico en Algas (CIDTA), Facultad de Ciencias del Mar, Universidad Católica del Norte, Larrondo 1281, Coquimbo, Chile.
| | - Iranzu Ganuza
- Facultad de Ciencias del Mar, Departamento de Acuicultura, Universidad Católica del Norte, Larrondo 1281, Coquimbo 1781421, Chile.
| | - Roberto Pino
- Facultad de Ciencias del Mar, Departamento de Acuicultura, Universidad Católica del Norte, Larrondo 1281, Coquimbo 1781421, Chile.
- Doctorado en Acuicultura, Programa Cooperativo Universidad de Chile, Universidad Católica del Norte, Pontificia Universidad Católica de Valparaíso, Coquimbo 17811421, Chile.
| | - Francisco Álvarez
- Facultad de Ciencias del Mar, Departamento de Acuicultura, Universidad Católica del Norte, Larrondo 1281, Coquimbo 1781421, Chile.
| | - José Rengel
- Facultad de Ciencias del Mar, Departamento de Acuicultura, Universidad Católica del Norte, Larrondo 1281, Coquimbo 1781421, Chile.
| | - Cristina Hernández
- Laboratorio Salud Pública, Seremi de Salud Región de Los Lagos, Crucero 1915, Puerto Montt 5505081, Chile.
| | - Eduardo Uribe
- Facultad de Ciencias del Mar, Departamento de Acuicultura, Universidad Católica del Norte, Larrondo 1281, Coquimbo 1781421, Chile.
| | - Juan Blanco
- Centro de Investigacións Mariñas (Xunta de Galicia), Apto. 13, 36620 Vilanova de Arousa, Pontevedra, Spain.
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Calado SLDM, Santos GS, Wojciechowski J, Magalhães VFD, Silva de Assis HC. The accumulation dynamics, elimination and risk assessment of paralytic shellfish toxins in fish from a water supply reservoir. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 651:3222-3229. [PMID: 30463170 DOI: 10.1016/j.scitotenv.2018.10.046] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Revised: 09/27/2018] [Accepted: 10/03/2018] [Indexed: 06/09/2023]
Abstract
Paralytic shellfish Toxins (PSTs) or saxitoxins are neurotoxins that block the neural transmission by binding to the voltage-gated sodium channels in the nerve cells. There are >50 analogues described, which could be biotransformed into a molecular form of greater or lesser toxicity. The Alagados Reservoir is used for water supply, and persistent cyanobacterial blooms as well as PSTs concentrations have been found in this water body since 2002. The aims of this study were to quantify the concentrations of PSTs in the water and fish samples from the Alagados Reservoir. In addition, we evaluated the elimination of PSTs for 90 days in fish and estimated the potential risk to human health. Water and fish samples were collected from the reservoir. For the water samples the phytoplankton and chemical analyses were carried out. Fish were divided into two sample times: Field Samples (FS) and Elimination Experiment Samples (EES), which were maintained for 90 days in filtered and dechlorinated water. For chemical analysis, the muscles of FS were collected on the fish sampling day and the muscles and feces of EES were collected at 7, 15, 30, 45, 60, 75 and 90 days. PSTs concentrations were present in water and fish samples, and they were estimated as a potential risk to humans; mainly for children. In addition, toxins were accumulated, biotransformed to other analogues and excreted by the fish. However, after 90 days, the toxins were still present in the water and fish muscle. Therefore, PSTs can remain for a long period in water, and fish can be a carrier of these neurotoxins. New approaches of monitoring and management are necessary in the actual global context of cyanobacteria and cyanotoxins.
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Affiliation(s)
- Sabrina Loise de Morais Calado
- Ecology and Conservation Program Post-Graduation - Federal University of Paraná (UFPR), Box 19031, 81530-980 Curitiba, PR, Brazil.
| | - Gustavo Souza Santos
- Ecology and Conservation Program Post-Graduation - Federal University of Paraná (UFPR), Box 19031, 81530-980 Curitiba, PR, Brazil.
| | - Juliana Wojciechowski
- Ecology and Conservation Program Post-Graduation - Federal University of Paraná (UFPR), Box 19031, 81530-980 Curitiba, PR, Brazil.
| | - Valéria Freitas de Magalhães
- Institute of Biophysics Carlos Chagas Filho, Box 21941-902, Ilha do Fundão, Rio de Janeiro, Rio de Janeiro, Brazil.
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19
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Dell'Aversano C, Tartaglione L, Polito G, Dean K, Giacobbe M, Casabianca S, Capellacci S, Penna A, Turner AD. First detection of tetrodotoxin and high levels of paralytic shellfish poisoning toxins in shellfish from Sicily (Italy) by three different analytical methods. CHEMOSPHERE 2019; 215:881-892. [PMID: 30408884 DOI: 10.1016/j.chemosphere.2018.10.081] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2018] [Revised: 10/08/2018] [Accepted: 10/12/2018] [Indexed: 06/08/2023]
Abstract
Paralytic shellfish toxins (PST) and tetrodotoxin (TTX) are naturally-occurring toxins that may contaminate the food chain, inducing similar neurological symptoms in humans. They are co-extracted under the same conditions and thus their combined detection is desirable. Whilst PST are regulated and officially monitored in Europe, more data on TTX occurrence in bivalves and gastropods are needed before meaningful regulations can be established. In this study, we used three separate analytical methods - pre-column oxidation with liquid chromatography and fluorescence detection, ultrahigh performance hydrophilic interaction liquid chromatography (HILIC) tandem mass spectrometry (MS/MS) and HILIC high resolution (HR) MS/MS - to investigate the presence of PST and TTX in seawater and shellfish (mussels, clams) collected in spring summer 2015 to 2017 in the Mediterranean Sea. Samples were collected at 10 sites in the Syracuse Bay (Sicily, Italy) in concomitance with a mixed bloom of Alexandrium minutum and A. pacificum. A very high PST contamination in mussels emerged, unprecedentedly found in Italy, with maximum total concentration of 10851 μg saxitoxin equivalents per kg of shellfish tissue measured in 2016. In addition, for the first time TTX was detected in Italy in most of the analysed samples in the range 0.8-6.4 μg TTX eq/kg. The recurring blooms of PST-producing species over the 3-year period, the high PST levels and the first finding of TTX in mussels from the Syracuse bay, suggest that monitoring programmes of PST and TTX in seafood should be activated in this geographical area.
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Affiliation(s)
- Carmela Dell'Aversano
- Department of Pharmacy, School of Medicine and Surgery, University of Napoli Federico II, Via D. Montesano 49, 80131 Napoli, Italy; CoNISMa - Italian Interuniversity Consortium on Marine Sciences, Piazzale Flaminio 9, 00196 Rome, Italy.
| | - Luciana Tartaglione
- Department of Pharmacy, School of Medicine and Surgery, University of Napoli Federico II, Via D. Montesano 49, 80131 Napoli, Italy; CoNISMa - Italian Interuniversity Consortium on Marine Sciences, Piazzale Flaminio 9, 00196 Rome, Italy
| | - Giuseppe Polito
- Department of Pharmacy, School of Medicine and Surgery, University of Napoli Federico II, Via D. Montesano 49, 80131 Napoli, Italy
| | - Karl Dean
- Centre for Environment, Fisheries and Aquaculture Science (CEFAS), Barrack Road, The Nothe, Weymouth, Dorset, DT4 8UB, United Kingdom
| | - Mariagrazia Giacobbe
- Institute for Biological Resources and Marine Biotechnologies (IRBIM), National Research Council (NRC), Via San Raineri 86, 98122 Messina, Italy
| | - Silvia Casabianca
- CoNISMa - Italian Interuniversity Consortium on Marine Sciences, Piazzale Flaminio 9, 00196 Rome, Italy; Department of Biomolecular Sciences, University of Urbino, Viale Trieste 296, 61121 Pesaro, Italy
| | - Samuela Capellacci
- CoNISMa - Italian Interuniversity Consortium on Marine Sciences, Piazzale Flaminio 9, 00196 Rome, Italy; Department of Biomolecular Sciences, University of Urbino, Viale Trieste 296, 61121 Pesaro, Italy
| | - Antonella Penna
- CoNISMa - Italian Interuniversity Consortium on Marine Sciences, Piazzale Flaminio 9, 00196 Rome, Italy; Department of Biomolecular Sciences, University of Urbino, Viale Trieste 296, 61121 Pesaro, Italy
| | - Andrew D Turner
- Centre for Environment, Fisheries and Aquaculture Science (CEFAS), Barrack Road, The Nothe, Weymouth, Dorset, DT4 8UB, United Kingdom
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Calado SLDM, Wojciechowski J, Santos GS, Magalhães VFD, Padial AA, Cestari MM, Silva de Assis HCD. Neurotoxins in a water supply reservoir: An alert to environmental and human health. Toxicon 2017; 126:12-22. [DOI: 10.1016/j.toxicon.2016.12.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2016] [Revised: 12/04/2016] [Accepted: 12/07/2016] [Indexed: 02/01/2023]
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Costa ST, Vale C, Raimundo J, Matias D, Botelho MJ. Changes of paralytic shellfish toxins in gills and digestive glands of the cockle Cerastoderma edule under post-bloom natural conditions. CHEMOSPHERE 2016; 149:351-357. [PMID: 26874623 DOI: 10.1016/j.chemosphere.2016.01.105] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Revised: 01/20/2016] [Accepted: 01/24/2016] [Indexed: 06/05/2023]
Abstract
Concentrations of the paralytic shellfish toxins C1+2, C3+4, GTX5, GTX6, dcGTX2+3, dcSTX, dcNEO, GTX2+3, GTX1+4, STX and NEO were determined by LC-FLD in composite samples of digestive glands and gills of Cerastoderma edule cockle. The specimens were sampled in Aveiro lagoon, Portugal, under natural depuration conditions (days 0, 8, 12, 14, 19, 21 and 25) after exposure to a bloom of Gymnodinium catenatum. Individual paralytic shellfish toxins indicated different pathways of elimination and biotransformation in digestive gland and gills. Toxin concentrations in gills were lower than in digestive gland. Most of the quantified toxins in digestive gland decreased during the 25 days of observation according to negative exponential curves, and only GTX5, GTX6 and NEO showed slight irregularities with time. Concentrations of C1+2, C3+4 and dcGTX2+3 in gills decreased progressively, however GTX5, GTX6 and dcSTX showed pronounced increases. Higher concentrations of those toxins in days 8 and 12 in comparison to the initial value (day 0) indicate conversion of other toxins into GTX5, GTX6 and dcSTX during those periods. It appears that inter-conversion of toxins occurs as G. catenatum cells are retained in gills before being transferred to other compartments.
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Affiliation(s)
- Sara T Costa
- IPMA, Portuguese Institute for the Sea and Atmosphere, Rua Alfredo Magalhães Ramalho 6, 1495-006 Lisbon, Portugal
| | - Carlos Vale
- CIIMAR, Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Rua dos Bragas 289, 4050-123 Porto, Portugal
| | - Joana Raimundo
- IPMA, Portuguese Institute for the Sea and Atmosphere, Rua Alfredo Magalhães Ramalho 6, 1495-006 Lisbon, Portugal; CIIMAR, Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Rua dos Bragas 289, 4050-123 Porto, Portugal
| | - Domitília Matias
- CIIMAR, Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Rua dos Bragas 289, 4050-123 Porto, Portugal; IPMA, Portuguese Institute for the Sea and Atmosphere, Av. 5 de Outubro, 8700-305 Olhão, Portugal
| | - Maria João Botelho
- IPMA, Portuguese Institute for the Sea and Atmosphere, Rua Alfredo Magalhães Ramalho 6, 1495-006 Lisbon, Portugal; CIIMAR, Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Rua dos Bragas 289, 4050-123 Porto, Portugal.
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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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Botelho MJ, Raimundo J, Vale C, Ferreira JG. Partitioning of paralytic shellfish toxins in sub-cellular fractions of the digestive gland of the cockle Cerastoderma edule: Changes under post-bloom natural conditions. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2014; 104:365-372. [PMID: 24736027 DOI: 10.1016/j.ecoenv.2014.02.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2013] [Revised: 02/09/2014] [Accepted: 02/12/2014] [Indexed: 06/03/2023]
Abstract
Concentrations of paralytic shellfish toxins (C1+2, B1, dcGTX2+3, dcSTX, GTX2+3 and STX) were determined by LC-FLD in composite samples of digestive glands of the cockle Cerastoderma edule and in each sub-cellular particulate fractions obtained after differential centrifugation (nuclei+debris, mitochondria, lysosomes and microsomes). The specimens were sampled during the exposure to a bloom of Gymnodinium catenatum (day 0) and in the subsequent 8, 12, 14, 19, 21 and 25 days under natural depuration conditions. Toxin profiles of digestive glands were dominated by C1+2 followed by B1 and dcGTX2+3, although the proportion between C1+2 and B1 contents decreased with the time, indicating a slower elimination of B1. All toxins, except GTX2+3 and STX, were quantified in the four sub-cellular fractions. The content of the quantified toxins decreased most markedly in nuclei+debris and microsomal fractions, during the first eight and 12 days, respectively. Conversely, different patterns were observed among toxins in mitochondrial and lysosomal fractions. The less accentuated decreases of dcGTX2+3 and dcSTX contents in the mitochondrial fraction may have resulted from the conversion of other toxins, like C1+2 and B1, associated with enzymatic activities in that fraction. The largest discrepancy was registered in lysosomal fraction for B1, since its content increased after eight days of post-bloom conditions. Input of B1 may come from the conversion of other toxins, like the abundant B2 and C1+2. These transformations are associated to the major role of lysosomes in the intra-cellular digestive process of materials acquired through vesicular transport.
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Affiliation(s)
- Maria João Botelho
- IPMA, Portuguese Institute for the Sea and Atmosphere, Av. Brasília, 1449-006 Lisbon, Portugal.
| | - Joana Raimundo
- IPMA, Portuguese Institute for the Sea and Atmosphere, Av. Brasília, 1449-006 Lisbon, Portugal
| | - Carlos Vale
- IPMA, Portuguese Institute for the Sea and Atmosphere, Av. Brasília, 1449-006 Lisbon, Portugal; CIIMAR, Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Rua dos Bragas 289, 4050-123 Porto, Portugal
| | - João Gomes Ferreira
- CMA, Dept. Environmental Sciences and Engineering, FCT-UNL, 2829-516 Monte de Caparica, Portugal
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Roje-Busatto R, Ujević I. PSP toxins profile in ascidian Microcosmus vulgaris (Heller, 1877) after human poisoning in Croatia (Adriatic Sea). Toxicon 2014; 79:28-36. [PMID: 24418175 DOI: 10.1016/j.toxicon.2013.12.014] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2013] [Revised: 12/30/2013] [Accepted: 12/31/2013] [Indexed: 12/01/2022]
Abstract
Toxins known to cause Paralytic Shellfish Poisoning (PSP) syndrome in humans that can have serious economic consequences for aquaculture were determined in ascidians of the genus Microcosmus. Significant concentrations of toxins were confirmed in all tested samples collected from the western coast of Istria Peninsula (Adriatic Sea, Croatia) when six people were poisoned following the consumption of fresh ascidians. Several species of bivalves that were under continuous monitoring had not accumulated PSP toxins although they were exposed to the same environmental conditions over the survey period. In the present study, HPLC-FLD with pre-column oxidation of PSP toxins has been carried out to provide evidence for the first human intoxication due to consumption of PSP toxic ascidians (Microcosmus vulgaris, Heller, 1877) harvested from the Adriatic Sea. Qualitative analysis established the presence of six PSP toxins: saxitoxin (STX), decarbamoylsaxitoxin (dcSTX), gonyautoxins 2 and 3 (GTX2,3), decarbamoylgonyautoxins 2 and 3 (dcGTX2,3), gonyautoxin 5 (GTX5) and N-sulfocarbamoylgonyautoxins 1 and 2 (C1,2), while quantitative analysis suggested STX and GTX2,3 as dominant toxin types and the ones that contribute the most to the overall toxicity of these samples with concentrations near the regulatory limit.
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Affiliation(s)
- Romana Roje-Busatto
- Institute of Oceanography and Fisheries, Šetalište I. Meštrovića 63, 21000 Split, P.O. Box 500, Croatia.
| | - Ivana Ujević
- Institute of Oceanography and Fisheries, Šetalište I. Meštrovića 63, 21000 Split, P.O. Box 500, Croatia.
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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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Transformation of paralytic shellfish poisoning toxins in UK surf clams (Spisula solida) for targeted production of reference materials. Toxicon 2013; 65:41-58. [DOI: 10.1016/j.toxicon.2013.01.008] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2012] [Revised: 12/18/2012] [Accepted: 01/17/2013] [Indexed: 11/21/2022]
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Botelho MJ, Vale C, Grilo RV, Ferreira JG. Uptake and release of paralytic shellfish toxins by the clam Ruditapes decussatus exposed to Gymnodinium catenatum and subsequent depuration. MARINE ENVIRONMENTAL RESEARCH 2012; 77:23-29. [PMID: 22309810 DOI: 10.1016/j.marenvres.2012.01.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2011] [Revised: 01/11/2012] [Accepted: 01/11/2012] [Indexed: 05/31/2023]
Abstract
A laboratory experiment was performed with the clam Ruditapes decussatus, fed with the toxic dinoflagellate Gymnodinium catenatum and the non-toxic algae Isochrysis galbana (14 days) and subsequently only with I. galbana (15 days). Individual paralytic shellfish toxins were determined by LC-FLD in G. catenatum cells, whole clam tissues, and particulate organic matter (POM) produced by clams. The toxins dcSTX and dcGTX2 + 3 in the algae were less abundant than C1 + 2 and B1, but were predominant in clams during both the exposure and depuration phases. The toxin dcNEO was only detected in clams during a short period, indicating conversion from other compounds. The toxin composition of the POM indicated the export of dcSTX as faeces or pseudo-faeces along the entire experiment (2.5-14 nmol mg(-1)), B1 was present in a short period of the exposure and C1 + 2 and dcGTX2 + 3 absent. A mass balance calculation indicated that approximately 95% of C1 + 2 and 85% of B1 supplied to the clams were converted into other toxins or lost in solution. Conversely, the net gain of 512, 61 and 31 nmol for dcSTX, dcGTX2 + 3 and dcNEO, respectively, suggests the conversion from other assimilated compounds by clams during exposure and depuration phases.
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Escobedo-Lozano AY, Estrada N, Ascencio F, Contreras G, Alonso-Rodriguez R. Accumulation, biotransformation, histopathology and paralysis in the Pacific calico scallop Argopecten ventricosus by the paralyzing toxins of the dinoflagellate Gymnodinium catenatum. Mar Drugs 2012; 10:1044-1065. [PMID: 22822356 PMCID: PMC3397451 DOI: 10.3390/md10051044] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2012] [Revised: 04/10/2012] [Accepted: 04/18/2012] [Indexed: 11/16/2022] Open
Abstract
The dinoflagellate Gymnodinium catenatum produces paralyzing shellfish poisons that are consumed and accumulated by bivalves. We performed short-term feeding experiments to examine ingestion, accumulation, biotransformation, histopathology, and paralysis in the juvenile Pacific calico scallop Argopecten ventricosus that consume this dinoflagellate. Depletion of algal cells was measured in closed systems. Histopathological preparations were microscopically analyzed. Paralysis was observed and the time of recovery recorded. Accumulation and possible biotransformation of toxins were measured by HPLC analysis. Feeding activity in treated scallops showed that scallops produced pseudofeces, ingestion rates decreased at 8 h; approximately 60% of the scallops were paralyzed and melanin production and hemocyte aggregation were observed in several tissues at 15 h. HPLC analysis showed that the only toxins present in the dinoflagellates and scallops were the N-sulfo-carbamoyl toxins (C1, C2); after hydrolysis, the carbamate toxins (epimers GTX2/3) were present. C1 and C2 toxins were most common in the mantle, followed by the digestive gland and stomach-complex, adductor muscle, kidney and rectum group, and finally, gills. Toxin profiles in scallop tissue were similar to the dinoflagellate; biotransformations were not present in the scallops in this short-term feeding experiment.
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Affiliation(s)
- Amada Y. Escobedo-Lozano
- Laboratorio de Biotoxinas Marinas, Instituto de Ciencias del Mary Limnologia, Universidad Nacional Autonoma de Mexico, Apdo. Postal 811, Mazatlan, Sinaloa 82040, Mexico;
- Departamento de Ingenieria Quimica-Bioquimica, Instituto Tecnologico de Mazatlan, Calle Corsario 1 No. 203, Col. Urias, Mazatlan, Sinaloa 82070, Mexico
| | - Norma Estrada
- Departamento de Fisiologia, Biofisica y Neurociencias, Centro de Investigacion y de Estudios Avanzados del IPN, Av. Instituto Politecnico Nacional 2508, Mexico City, D.F. 07300, Mexico; (N.E.); (G.C.)
- Departamento de Patologia Marina, Centro de Investigaciones Biologicas del Noroeste, Mar Bermejo 195, Col. Playa Palo de Santa Rita, La Paz, B.C.S. 23096, Mexico;
| | - Felipe Ascencio
- Departamento de Patologia Marina, Centro de Investigaciones Biologicas del Noroeste, Mar Bermejo 195, Col. Playa Palo de Santa Rita, La Paz, B.C.S. 23096, Mexico;
| | - Gerardo Contreras
- Departamento de Fisiologia, Biofisica y Neurociencias, Centro de Investigacion y de Estudios Avanzados del IPN, Av. Instituto Politecnico Nacional 2508, Mexico City, D.F. 07300, Mexico; (N.E.); (G.C.)
| | - Rosalba Alonso-Rodriguez
- Laboratorio de Biotoxinas Marinas, Instituto de Ciencias del Mary Limnologia, Universidad Nacional Autonoma de Mexico, Apdo. Postal 811, Mazatlan, Sinaloa 82040, Mexico;
- Author to whom correspondence should be addressed; ; Tel.: +52-669-985-2845; Fax: +52-669-982-6133
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Ho L, Sawade E, Newcombe G. Biological treatment options for cyanobacteria metabolite removal--a review. WATER RESEARCH 2012; 46:1536-1548. [PMID: 22133838 DOI: 10.1016/j.watres.2011.11.018] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2011] [Revised: 10/25/2011] [Accepted: 11/04/2011] [Indexed: 05/31/2023]
Abstract
The treatment of cyanobacterial metabolites can consume many resources for water authorities which can be problematic especially with the recent shift away from chemical- and energy-intensive processes towards carbon and climate neutrality. In recent times, there has been a renaissance in biological treatment, in particular, biological filtration processes, for cyanobacteria metabolite removal. This in part, is due to the advances in molecular microbiology which has assisted in further understanding the biodegradation processes of specific cyanobacteria metabolites. However, there is currently no concise portfolio which captures all the pertinent information for the biological treatment of a range of cyanobacterial metabolites. This review encapsulates all the relevant information to date in one document and provides insights into how biological treatment options can be implemented in treatment plants for optimum cyanobacterial metabolite removal.
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Affiliation(s)
- Lionel Ho
- Australian Water Quality Centre, South Australian Water Corporation, 250 Victoria Square, Adelaide, SA 5000, Australia.
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Costa PR, Pereira P, Guilherme S, Barata M, Nicolau L, Santos MA, Pacheco M, Pousão-Ferreira P. Biotransformation modulation and genotoxicity in white seabream upon exposure to paralytic shellfish toxins produced by Gymnodinium catenatum. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2012; 106-107:42-47. [PMID: 22057254 DOI: 10.1016/j.aquatox.2011.08.023] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2011] [Revised: 06/30/2011] [Accepted: 08/28/2011] [Indexed: 05/31/2023]
Abstract
Fish are recurrently exposed to paralytic shellfish toxins (PSTs) produced by Gymnodinium catenatum. Nevertheless, the knowledge regarding metabolism of PSTs and their toxic effects in fish is scarce. Consequently, the current study aims to investigate the role of phase I and II detoxification enzymes on PST metabolism in the liver of white seabream (Diplodus sargus), assessing ethoxyresorufin-O-deethylase (EROD) and glutathione S-transferase (GST) activities. Moreover, the genotoxic potential of PSTs was examined through the erythrocytic nuclear abnormality (ENA) assay. Fish were intracoelomically (IC) injected with a nominal dose (expressed as saxitoxin equivalents) of 1.60 μg STXeq kg⁻¹ semipurified from a G. catenatum cell culture with previously determined toxin profile. Fish were sacrificed 2 and 6 days after IC injection. PST levels determined in fish liver were 15.2 and 12.2 μg STXeq kg⁻¹, respectively, at 2 and 6 days after the injection. Though several PSTs were administered, only dcSTX was detected in the liver after 2 and 6 days. This was regarded as an evidence that most of the N-sulfocarbamoyl and decarbamoyl toxins were rapidly biotransformed in D. sargus liver and/or eliminated. This was corroborated by a hepatic GST activity induction at 2 days after injection. Hepatic EROD activity was unresponsive to PSTs, suggesting that these toxins enter phase II of biotransformation directly. The genotoxic potential of PSTs was also demonstrated; these toxins were able to induce cytogenetic damage, such as chromosome (or chromatid) breaks or loss and segregational anomalies, measured by the ENA assay. Overall, this study pointed out the ecological risk associated with the contamination of fish with PSTs generated by G. catenatum blooms, providing the necessary first data for a proper interpretation of biomonitoring programs aiming to assess the impact of phytoplankton blooms in fish.
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Affiliation(s)
- Pedro Reis Costa
- IPIMAR-National Institute for Biological Resources (INRB/IPIMAR), Av. Brasília, 1449-006 Lisboa, Portugal.
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Wong CK, Hung P, Ng HCC, Lee SY, Kam KM. Cluster analysis of toxins profile pattern as a tool for tracing shellfish contaminated with PSP-toxins. ENVIRONMENTAL RESEARCH 2011; 111:1083-1090. [PMID: 21777914 DOI: 10.1016/j.envres.2011.06.013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2011] [Revised: 05/21/2011] [Accepted: 06/28/2011] [Indexed: 05/31/2023]
Abstract
Paralytic shellfish poisoning (PSP) is one of the most lethal biotoxin-induced diseases worldwide, which may pose serious public health threat and potential devastating economic damage on fisheries industry in the affected region(s). To prevent the importation of PSP contaminated shellfish to a community, detailed documentation on the supply chain and routine surveillance systems are, in principle, crucial measures to protect people from this intoxication. However, difficulties have always been encountered on the traceability of the source/origin of contaminated shellfish. In the present study, we reported the potential application of PSP-toxins profiles with similarity analysis that can be used to identify epidemiological linkage between shellfish samples collected from markets and patients during a PSP outbreak. PSP-toxins were identified and quantified by ion-pair chromatographic separation followed by post-column oxidation to fluorescent imino purine derivatives. Samples from a PSP incident and other surveillance samples collected in our past 7-year record were also compared for their similarity in PSP-toxins profiles patterns. Molar distributions (nmol%) of 10 PSP-toxins were analyzed by Unweighted Pair Group Method with Arithmetric averages (UPGMA). Three prominent clusters emerged with similarity levels reaching over 80% for each, suggesting that each group of samples probably originated from a same source/batch. The PSP-toxins profiles and toxicities determined from surveillance samples could provide premonitory clues on the occurrences of PSP incident and outbreak with corresponding toxin profiles in the later time. Due to species-specific characteristics of PSP-toxins composition and profile in shellfish under varieties of environmental and physiological conditions, PSP-toxins profile can be a specific and useful biochemical indicator for tracing PSP contaminated shellfish provided that spatio-temporal occurrence patterns of toxins profiles are available in a databank for inter-laboratory comparison and standardized methodologies such as consentaneous toxins extraction and identification criteria are used for analysis and comparison.
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Affiliation(s)
- Chun-Kwan Wong
- Biotoxin Laboratory, Microbiology Division, Public Health Laboratory Services Branch, Centre for Health Protection, Department of Health, Shek Kip Mei, Rm. 731, 7/F, 382 Nam Cheong St., Kowloon, Hong Kong.
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Bricelj VM, Ford SE, Lambert C, Barbou A, Paillard C. Effects of toxic Alexandrium tamarense on behavior, hemocyte responses and development of brown ring disease in Manila clams. MARINE ECOLOGY PROGRESS SERIES 2011. [DOI: 10.3354/meps09111] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Development of quantitative NMR method with internal standard for the standard solutions of paralytic shellfish toxins and characterisation of gonyautoxin-5 and gonyautoxin-6. Toxicon 2010; 56:589-95. [DOI: 10.1016/j.toxicon.2010.06.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2010] [Revised: 06/01/2010] [Accepted: 06/01/2010] [Indexed: 11/21/2022]
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Etheridge SM. Paralytic shellfish poisoning: Seafood safety and human health perspectives. Toxicon 2010; 56:108-22. [DOI: 10.1016/j.toxicon.2009.12.013] [Citation(s) in RCA: 163] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2009] [Revised: 11/12/2009] [Accepted: 12/11/2009] [Indexed: 10/20/2022]
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Wiese M, D’Agostino PM, Mihali TK, Moffitt MC, Neilan BA. Neurotoxic alkaloids: saxitoxin and its analogs. Mar Drugs 2010; 8:2185-211. [PMID: 20714432 PMCID: PMC2920551 DOI: 10.3390/md8072185] [Citation(s) in RCA: 434] [Impact Index Per Article: 31.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2010] [Revised: 07/12/2010] [Accepted: 07/16/2010] [Indexed: 11/25/2022] Open
Abstract
Saxitoxin (STX) and its 57 analogs are a broad group of natural neurotoxic alkaloids, commonly known as the paralytic shellfish toxins (PSTs). PSTs are the causative agents of paralytic shellfish poisoning (PSP) and are mostly associated with marine dinoflagellates (eukaryotes) and freshwater cyanobacteria (prokaryotes), which form extensive blooms around the world. PST producing dinoflagellates belong to the genera Alexandrium, Gymnodinium and Pyrodinium whilst production has been identified in several cyanobacterial genera including Anabaena, Cylindrospermopsis, Aphanizomenon Planktothrix and Lyngbya. STX and its analogs can be structurally classified into several classes such as non-sulfated, mono-sulfated, di-sulfated, decarbamoylated and the recently discovered hydrophobic analogs--each with varying levels of toxicity. Biotransformation of the PSTs into other PST analogs has been identified within marine invertebrates, humans and bacteria. An improved understanding of PST transformation into less toxic analogs and degradation, both chemically or enzymatically, will be important for the development of methods for the detoxification of contaminated water supplies and of shellfish destined for consumption. Some PSTs also have demonstrated pharmaceutical potential as a long-term anesthetic in the treatment of anal fissures and for chronic tension-type headache. The recent elucidation of the saxitoxin biosynthetic gene cluster in cyanobacteria and the identification of new PST analogs will present opportunities to further explore the pharmaceutical potential of these intriguing alkaloids.
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Affiliation(s)
- Maria Wiese
- School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, NSW, 2052, Australia; E-Mails: (M.W.); (T.K.M.)
| | - Paul M. D’Agostino
- School of Biomedical and Health Sciences, University of Western Sydney, Campbelltown, NSW, 2560, Australia; E-Mails: (P.M.D.); (M.C.M.)
| | - Troco K. Mihali
- School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, NSW, 2052, Australia; E-Mails: (M.W.); (T.K.M.)
| | - Michelle C. Moffitt
- School of Biomedical and Health Sciences, University of Western Sydney, Campbelltown, NSW, 2560, Australia; E-Mails: (P.M.D.); (M.C.M.)
| | - Brett A. Neilan
- School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, NSW, 2052, Australia; E-Mails: (M.W.); (T.K.M.)
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Botelho MJ, Vale C, Mota AM, S. Simões Gonçalves MDL. Depuration kinetics of paralytic shellfish toxins in Mytilus galloprovincialis exposed to Gymnodinium catenatum: laboratory and field experiments. ACTA ACUST UNITED AC 2010; 12:2269-75. [DOI: 10.1039/c0em00202j] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Donovan CJ, Garduño RA, Kalmokoff M, Ku JC, Quilliam MA, Gill TA. Pseudoalteromonas bacteria are capable of degrading paralytic shellfish toxins. Appl Environ Microbiol 2009; 75:6919-23. [PMID: 19717625 PMCID: PMC2772429 DOI: 10.1128/aem.01384-09] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2009] [Accepted: 08/21/2009] [Indexed: 11/20/2022] Open
Abstract
Marine bacterial isolates cultured from the digestive tracts of blue mussels (Mytilus edulis) contaminated with paralytic shellfish toxins (PSTs) were screened for the ability to reduce the toxicity of a PST mixture. Seven isolates reduced the overall toxicity of the algal extract by > or = 90% within 3 days. These isolates shared at least 99% 16S rRNA gene sequence similarity with five Pseudoalteromonas spp. Phenotypic tests suggested that all are novel strains of Pseudoalteromonas haloplanktis.
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Affiliation(s)
- Carrie J. Donovan
- Food Science Program, Department of Process Engineering and Applied Science, Dalhousie University, Halifax, Nova Scotia, Canada B3J 2X4, Department of Microbiology and Immunology and Department of Medicine—Division of Infectious Diseases, Dalhousie University, Halifax, Nova Scotia, Canada B3H 1X5, Agriculture and Agrifood Canada, Kentville, Nova Scotia, Canada B4N 1J5, National Research Council of Canada—Institute for Marine Biosciences, Halifax, Nova Scotia, Canada B3H 3Z1
| | - Rafael A. Garduño
- Food Science Program, Department of Process Engineering and Applied Science, Dalhousie University, Halifax, Nova Scotia, Canada B3J 2X4, Department of Microbiology and Immunology and Department of Medicine—Division of Infectious Diseases, Dalhousie University, Halifax, Nova Scotia, Canada B3H 1X5, Agriculture and Agrifood Canada, Kentville, Nova Scotia, Canada B4N 1J5, National Research Council of Canada—Institute for Marine Biosciences, Halifax, Nova Scotia, Canada B3H 3Z1
| | - Martin Kalmokoff
- Food Science Program, Department of Process Engineering and Applied Science, Dalhousie University, Halifax, Nova Scotia, Canada B3J 2X4, Department of Microbiology and Immunology and Department of Medicine—Division of Infectious Diseases, Dalhousie University, Halifax, Nova Scotia, Canada B3H 1X5, Agriculture and Agrifood Canada, Kentville, Nova Scotia, Canada B4N 1J5, National Research Council of Canada—Institute for Marine Biosciences, Halifax, Nova Scotia, Canada B3H 3Z1
| | - John C. Ku
- Food Science Program, Department of Process Engineering and Applied Science, Dalhousie University, Halifax, Nova Scotia, Canada B3J 2X4, Department of Microbiology and Immunology and Department of Medicine—Division of Infectious Diseases, Dalhousie University, Halifax, Nova Scotia, Canada B3H 1X5, Agriculture and Agrifood Canada, Kentville, Nova Scotia, Canada B4N 1J5, National Research Council of Canada—Institute for Marine Biosciences, Halifax, Nova Scotia, Canada B3H 3Z1
| | - Michael A. Quilliam
- Food Science Program, Department of Process Engineering and Applied Science, Dalhousie University, Halifax, Nova Scotia, Canada B3J 2X4, Department of Microbiology and Immunology and Department of Medicine—Division of Infectious Diseases, Dalhousie University, Halifax, Nova Scotia, Canada B3H 1X5, Agriculture and Agrifood Canada, Kentville, Nova Scotia, Canada B4N 1J5, National Research Council of Canada—Institute for Marine Biosciences, Halifax, Nova Scotia, Canada B3H 3Z1
| | - Tom A. Gill
- Food Science Program, Department of Process Engineering and Applied Science, Dalhousie University, Halifax, Nova Scotia, Canada B3J 2X4, Department of Microbiology and Immunology and Department of Medicine—Division of Infectious Diseases, Dalhousie University, Halifax, Nova Scotia, Canada B3H 1X5, Agriculture and Agrifood Canada, Kentville, Nova Scotia, Canada B4N 1J5, National Research Council of Canada—Institute for Marine Biosciences, Halifax, Nova Scotia, Canada B3H 3Z1
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Comparative determination of paralytic shellfish toxins (PSTs) using five different toxin detection methods in shellfish species collected in the Aleutian Islands, Alaska. Toxicon 2009; 54:313-20. [DOI: 10.1016/j.toxicon.2009.04.023] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2009] [Revised: 04/16/2009] [Accepted: 04/16/2009] [Indexed: 11/18/2022]
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Carmichael WW, Jones CL, Mahmood NA, Theiss WC, Krogh P. Algal toxins and water‐based diseases. ACTA ACUST UNITED AC 2009. [DOI: 10.1080/10643388509381734] [Citation(s) in RCA: 104] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Kayal N, Newcombe G, Ho L. Investigating the fate of saxitoxins in biologically active water treatment plant filters. ENVIRONMENTAL TOXICOLOGY 2008; 23:751-755. [PMID: 18442074 DOI: 10.1002/tox.20384] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The saxitoxins are potent neurotoxins, which can be produced by freshwater cyanobacteria. This study assessed the fate of five saxitoxins variants through biologically active laboratory filters containing media sourced from the filters beds of two water treatment plants (WTPs). Decreases in the concentration of the less toxic variants coincided with increases in the concentrations of the more toxic variants through the filters containing anthracite sourced from two different WTPs. No changes in toxin concentrations were evident through parallel filters containing sand. The results strongly suggest that organisms within the biofilm of the anthracite filters possessed the ability to biotransform the saxitoxins variants, which has important implications for drinking water treatment, particularly since this has the potential to increase the toxicity of the filtered water.
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Affiliation(s)
- Nawal Kayal
- Australian Water Quality Centre, South Australian Water Corporation, PMB 3, Salisbury, South Australia 5108, Australia
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Cho Y, Ogawa N, Takahashi M, Lin HP, Oshima Y. Purification and characterization of paralytic shellfish toxin-transforming enzyme, sulfocarbamoylase I, from the Japanese bivalve Peronidia venulosa. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2008; 1784:1277-85. [DOI: 10.1016/j.bbapap.2008.05.008] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2008] [Revised: 05/10/2008] [Accepted: 05/19/2008] [Indexed: 11/28/2022]
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Donovan CJ, Ku JC, Quilliam MA, Gill TA. Bacterial degradation of paralytic shellfish toxins. Toxicon 2008; 52:91-100. [PMID: 18573270 DOI: 10.1016/j.toxicon.2008.05.005] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2007] [Revised: 05/02/2008] [Accepted: 05/06/2008] [Indexed: 11/28/2022]
Abstract
Bacteria isolated from the digestive tracts of blue mussels (Mytilus edulis) contaminated with paralytic shellfish toxins (PSTs) were screened for the ability to reduce the toxicity of a PST mixture in vitro. Bacteria were isolated on marine agar and grown in marine broth supplemented with a mussel extract and an algal extract containing PSTs (saxitoxin, neosaxitoxin, gonyautoxins 2 and 3, decarbamoyl-gonyautoxins 2 and 3 and C1/C2 toxins). Toxin levels were measured before and after 5d of incubation, using high performance liquid chromatography (HPLC) and reduction of overall toxicity verified by mouse bioassays. Of the 73 bacterial cultures screened, seven isolates were designated "competent" PST degraders, individually reducing the overall toxicity of the PSTs by at least 90% within 3d. Most isolates degraded 100% of the saxitoxin and neosaxitoxin within 1-3d. In all cases, the overall kinetics of degradation of the toxicities was first order, as were the individual degradation kinetics of most of the individual toxins. This is the first report of nearly complete elimination of PSTs through bacterial action and may perhaps result in the development of a practical means to eliminate or reduce the risk of PSP intoxication associated with shellfish consumption.
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Affiliation(s)
- Carrie J Donovan
- Food Science Program, Department of Process Engineering and Applied Science, Dalhousie University, Halifax, NS, Canada, B3J 2X4
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Non-traditional vectors for paralytic shellfish poisoning. Mar Drugs 2008; 6:308-48. [PMID: 18728730 PMCID: PMC2525492 DOI: 10.3390/md20080015] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2008] [Revised: 06/03/2008] [Accepted: 06/03/2008] [Indexed: 11/28/2022] Open
Abstract
Paralytic shellfish poisoning (PSP), due to saxitoxin and related compounds, typically results from the consumption of filter-feeding molluscan shellfish that concentrate toxins from marine dinoflagellates. In addition to these microalgal sources, saxitoxin and related compounds, referred to in this review as STXs, are also produced in freshwater cyanobacteria and have been associated with calcareous red macroalgae. STXs are transferred and bioaccumulate throughout aquatic food webs, and can be vectored to terrestrial biota, including humans. Fisheries closures and human intoxications due to STXs have been documented in several non-traditional (i.e. non-filter-feeding) vectors. These include, but are not limited to, marine gastropods, both carnivorous and grazing, crustacea, and fish that acquire STXs through toxin transfer. Often due to spatial, temporal, or a species disconnection from the primary source of STXs (bloom forming dinoflagellates), monitoring and management of such non-traditional PSP vectors has been challenging. A brief literature review is provided for filter feeding (traditional) and non-filter feeding (non-traditional) vectors of STXs with specific reference to human effects. We include several case studies pertaining to management actions to prevent PSP, as well as food poisoning incidents from STX(s) accumulation in non-traditional PSP vectors.
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Pegram RA, Nichols T, Etheridge S, Humpage A, LeBlanc S, Love A, Neilan B, Pflugmacher S, Runnegar M, Thacker R. Cyanotoxins Workgroup report. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2008; 619:317-81. [PMID: 18461775 DOI: 10.1007/978-0-387-75865-7_15] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Yu KN, Kwong RWM, Wang WX, Lam PKS. Biokinetics of paralytic shellfish toxins in the green-lipped mussel, Perna viridis. MARINE POLLUTION BULLETIN 2007; 54:1068-71. [PMID: 17391712 DOI: 10.1016/j.marpolbul.2007.02.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2007] [Revised: 01/23/2007] [Accepted: 02/03/2007] [Indexed: 05/14/2023]
Affiliation(s)
- K N Yu
- Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong.
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Samsur M, Takatani T, Yamaguchi Y, Sagara T, Noguchi T, Arakawa O. Accumulation and elimination profiles of paralytic shellfish poison in the short-necked clam Tapes japonica fed with the toxic dinoflagellate Gymnodinium catenatum. Food Hygiene and Safety Science (Shokuhin Eiseigaku Zasshi) 2007; 48:13-8. [PMID: 17370612 DOI: 10.3358/shokueishi.48.13] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The paralytic shellfish poison (PSP)-producing dinoflagellate Gymnodinium catenatum (Gc) was fed to the short-necked clam Tapes japonica, and the accumulation, transformation and elimination profiles of PSP were investigated by means of high-performance liquid chromatography with postcolumn fluorescence derivatization (HPLC-FLD). The short-necked clams ingested most of the Gc cells (4 x 10(6) cells) supplied as a bolus at the beginning of the experiment, and accumulated a maximal amount of toxin (181 nmol/10 clams) after 12 hr. The rate of toxin accumulation at that time was 16%, which rapidly decreased thereafter. During the rearing period, a variation in toxin composition, derived presumably from the transformation of toxin analogues in the clams, was observed, including a reversal of the ratio of C2 to C1, and the appearance of carbamate (gonyautoxin (GTX) 2, 3) and decarbamoyl (dc) derivatives (decarbamoylsaxitoxin (dcSTX) and dcGTX2, 3), which were undetectable in Gc cells. The total amount of toxin contained in clams and residue (remaining Gc cells and/or excrement in the rearing tank) gradually declined, and only about 1% of the supplied toxin was detected at the end of the experiment.
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Affiliation(s)
- Mohamad Samsur
- Graduate School of Science and Technology, Nagasaki University: 1-14, Bunkyo-machi, Nagasaki-shi, Nagasaki 852-8521, Japan
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Camacho FG, Rodríguez JG, Mirón AS, García MCC, Belarbi EH, Chisti Y, Grima EM. Biotechnological significance of toxic marine dinoflagellates. Biotechnol Adv 2006; 25:176-94. [PMID: 17208406 DOI: 10.1016/j.biotechadv.2006.11.008] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2006] [Accepted: 11/28/2006] [Indexed: 10/23/2022]
Abstract
Dinoflagellates are microalgae that are associated with the production of many marine toxins. These toxins poison fish, other wildlife and humans. Dinoflagellate-associated human poisonings include paralytic shellfish poisoning, diarrhetic shellfish poisoning, neurotoxic shellfish poisoning, and ciguatera fish poisoning. Dinoflagellate toxins and bioactives are of increasing interest because of their commercial impact, influence on safety of seafood, and potential medical and other applications. This review discusses biotechnological methods of identifying toxic dinoflagellates and detecting their toxins. Potential applications of the toxins are discussed. A lack of sufficient quantities of toxins for investigational purposes remains a significant limitation. Producing quantities of dinoflagellate bioactives requires an ability to mass culture them. Considerations relating to bioreactor culture of generally fragile and slow-growing dinoflagellates are discussed. Production and processing of dinoflagellates to extract bioactives, require attention to biosafety considerations as outlined in this review.
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Affiliation(s)
- F Garcia Camacho
- Department of Chemical Engineering, University of Almería, 04120 Almería, Spain.
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