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Liang C, Ji Y, Ma J, Zhang C, Zhao H. Development of a highly sensitive and specific monoclonal antibody-based immunoassay for detection of okadaic acid in oysters and green mussels. FOOD AGR IMMUNOL 2022. [DOI: 10.1080/09540105.2022.2076812] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Affiliation(s)
- Cheng Liang
- State Key Laboratory of Marine Resources Utilization in South China Sea, Hainan University, Haikou, People’s Republic of China
- School of Chemical Engineering and Technology, Hainan University, Haikou, People’s Republic of China
| | - Yuxiang Ji
- Key Laboratory of Tropical Translational Medicine of Ministry of Education, NHC Key Laboratory of Tropical Disease Control, School of Tropical Medicine, Hainan Medical University, Haikou, People’s Republic of China
- Center for Eco-Environment Restoration of Hainan Province, College of Ecology and Environment, Hainan University, Haikou, People’s Republic of China
| | - Jiyong Ma
- State Key Laboratory of Marine Resources Utilization in South China Sea, Hainan University, Haikou, People’s Republic of China
- Center for Eco-Environment Restoration of Hainan Province, College of Ecology and Environment, Hainan University, Haikou, People’s Republic of China
| | - Chundong Zhang
- Modern Agricultural Inspection, Testing & Control Center of Hainan Province, Haikou, People’s Republic of China
| | - Hongwei Zhao
- State Key Laboratory of Marine Resources Utilization in South China Sea, Hainan University, Haikou, People’s Republic of China
- Center for Eco-Environment Restoration of Hainan Province, College of Ecology and Environment, Hainan University, Haikou, People’s Republic of China
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Li L, Ma R, Zhao Y, Wang L, Wang S, Mao X. Development of a colorimetric aptasensor fabricated with a group-specific aptamer and AuNPs@Fe2+ nanozyme for simultaneous detection of multiple diarrheic shellfish poisons. Talanta 2022; 246:123534. [DOI: 10.1016/j.talanta.2022.123534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Revised: 05/02/2022] [Accepted: 05/05/2022] [Indexed: 10/18/2022]
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Wilkins AL, Rundberget T, Sandvik M, Rise F, Knudsen BK, Kilcoyne J, Reguera B, Rial P, Wright EJ, Giddings SD, Boundy MJ, Rafuse C, Miles CO. Identification of 24- O-β-d-Glycosides and 7-Deoxy-Analogues of Okadaic Acid and Dinophysistoxin-1 and -2 in Extracts from Dinophysis Blooms, Dinophysis and Prorocentrum Cultures, and Shellfish in Europe, North America and Australasia. Toxins (Basel) 2021; 13:toxins13080510. [PMID: 34437381 PMCID: PMC8402559 DOI: 10.3390/toxins13080510] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Revised: 07/06/2021] [Accepted: 07/07/2021] [Indexed: 11/25/2022] Open
Abstract
Two high-mass polar compounds were observed in aqueous side-fractions from the purification of okadaic acid (1) and dinophysistoxin-2 (2) from Dinophysis blooms in Spain and Norway. These were isolated and shown to be 24-O-β-d-glucosides of 1 and 2 (4 and 5, respectively) by nuclear magnetic resonance (NMR) spectroscopy, mass spectrometry, and enzymatic hydrolysis. These, together with standards of 1, 2, dinophysistoxin-1 (3), and a synthetic specimen of 7-deoxy-1 (7), combined with an understanding of their mass spectrometric fragmentation patterns, were then used to identify 1–5, the 24-O-β-d-glucoside of dinophysistoxin-1 (6), 7, 7-deoxy-2 (8), and 7-deoxy-3 (9) in a range of extracts from Dinophysis blooms, Dinophysis cultures, and contaminated shellfish from Spain, Norway, Ireland, Canada, and New Zealand. A range of Prorocentrum lima cultures was also examined by liquid chromatography–high resolution tandem mass spectrometry (LC–HRMS/MS) and was found to contain 1, 3, 7, and 9. However, although 4–6 were not detected in these cultures, low levels of putative glycosides with the same exact masses as 4 and 6 were present. The potential implications of these findings for the toxicology, metabolism, and biosynthesis of the okadaic acid group of marine biotoxins are briefly discussed.
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Affiliation(s)
- Alistair L. Wilkins
- Norwegian Veterinary Institute, P.O. Box 64, NO-1431 Ås, Norway; (A.L.W.); (T.R.); (M.S.)
- School of Science and Engineering, University of Waikato, Private Bag 3105, Hamilton 3240, New Zealand;
| | - Thomas Rundberget
- Norwegian Veterinary Institute, P.O. Box 64, NO-1431 Ås, Norway; (A.L.W.); (T.R.); (M.S.)
- Norwegian Institute for Water Research, Gaustadalléen 21, NO-0349 Oslo, Norway
| | - Morten Sandvik
- Norwegian Veterinary Institute, P.O. Box 64, NO-1431 Ås, Norway; (A.L.W.); (T.R.); (M.S.)
| | - Frode Rise
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, NO-0315 Oslo, Norway;
| | - Brent K. Knudsen
- School of Science and Engineering, University of Waikato, Private Bag 3105, Hamilton 3240, New Zealand;
| | - Jane Kilcoyne
- Marine Institute, Rinville, Oranmore, County Galway H91 R673, Ireland;
| | - Beatriz Reguera
- Centro Oceanográfico de Vigo (IEO, CSIC), Subida a Radio Faro 50, 36390 Vigo, Spain; (B.R.); (P.R.)
| | - Pilar Rial
- Centro Oceanográfico de Vigo (IEO, CSIC), Subida a Radio Faro 50, 36390 Vigo, Spain; (B.R.); (P.R.)
| | - Elliott J. Wright
- Biotoxin Metrology, National Research Council, 1411 Oxford St., Halifax, NS B3H 3Z1, Canada; (E.J.W.); (S.D.G.); (C.R.)
| | - Sabrina D. Giddings
- Biotoxin Metrology, National Research Council, 1411 Oxford St., Halifax, NS B3H 3Z1, Canada; (E.J.W.); (S.D.G.); (C.R.)
| | - Michael J. Boundy
- Cawthron Institute, 98 Halifax Street East, Nelson 7010, New Zealand;
| | - Cheryl Rafuse
- Biotoxin Metrology, National Research Council, 1411 Oxford St., Halifax, NS B3H 3Z1, Canada; (E.J.W.); (S.D.G.); (C.R.)
| | - Christopher O. Miles
- Norwegian Veterinary Institute, P.O. Box 64, NO-1431 Ås, Norway; (A.L.W.); (T.R.); (M.S.)
- Biotoxin Metrology, National Research Council, 1411 Oxford St., Halifax, NS B3H 3Z1, Canada; (E.J.W.); (S.D.G.); (C.R.)
- Correspondence:
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Benchmark dose analyses of γH2AX and pH3 endpoints for quantitative comparison of in vitro genotoxicity potential of lipophilic phycotoxins. MUTATION RESEARCH-GENETIC TOXICOLOGY AND ENVIRONMENTAL MUTAGENESIS 2020; 852:503169. [PMID: 32265043 DOI: 10.1016/j.mrgentox.2020.503169] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Revised: 02/28/2020] [Accepted: 03/06/2020] [Indexed: 12/30/2022]
Abstract
The phycotoxins, okadaic acid (OA) and dinophysistoxins 1 and 2 (DTX-1 and -2), are protein phosphatase PP2A and PP1 inhibitors involved in diarrhetic shellfish poisoning (DSP) in humans. Data on the in vivo acute toxicity of the OA-group toxins show some differences and the European Food Safety Authority (EFSA) has determined toxicity equivalent factors (TEFs) of one for the reference toxin, OA, as well as for DTX-1 and 0.6 for DTX-2. However, recent in vitro studies indicated that DTX-1 seems to be more toxic than OA. As OA was described as apoptotic and aneugenic compound, we analyzed the DNA damage responses induced by the 3 toxins through γH2AX and pH3 biomarkers on proliferative HepaRG cells using High Content Analysis. We quantitatively examined the responses for γH2AX and pH3 by benchmark dose analyzing (BMD) using PROAST software. We found that the three toxins increased both γH2AX- and pH3-positive cells populations in a concentration-dependent manner. The 3 toxins induced mitotic arrest, characteristic of aneugenic compounds, as well as DNA strand-breaks concomitantly to cytotoxicity. BMD analysis showed that DTX-1 is the most potent inducer of DNA damage, followed by OA and DTX-2. The quantitative genotoxic data provided in this study are additional findings for reconsidering the estimated TEFs of this group of phycotoxins.
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Louzao MC, Fernández DA, Abal P, Fraga M, Vilariño N, Vieytes MR, Botana LM. Diarrhetic effect of okadaic acid could be related with its neuronal action: Changes in neuropeptide Y. Toxicol Lett 2015; 237:151-60. [PMID: 26086426 DOI: 10.1016/j.toxlet.2015.06.004] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Revised: 05/29/2015] [Accepted: 06/02/2015] [Indexed: 01/25/2023]
Abstract
Okadaic acid (OA) and dinophysistoxins (DTXs) are a group of marine toxins that cause diarrheic shellfish poisoning (DSP) in humans and animals. These compounds are produced by dinoflagellates of the Prorocentrum and Dinophysis genera and can accumulate in filter-feeding bivalves, posing a serious health risk for shellfish consumers. The enteric nervous system (ENS) plays a crucial role in the regulation of the gastrointestinal tract. In addition, neuropeptides produced by ENS affects the epithelial barrier functions. In the present work we used a two-compartment human coculture model containing the SH-SY5Y neuroblastoma cell line and polarized colonic epithelial monolayers (Caco-2) to study the OA intestinal permeability. First, we have determined OA cytotoxicity and we have found that OA reduces the viability of SH-SY5Y in a dose-dependent way, even though DTX1 is 4 to 5 times more potent than OA. Besides DTX1 is 15 to 18 orders of magnitude more potent than OA in decreasing transepithelial electrical resistance (TEER) of caco-2 cells without inducing cytotoxicity. Permeability assays indicate that OA cross the monolayer and modulates the neuropeptide Y (NPY) secretion by neuroblastoma cells. This NPY also affects the permeability of OA. This offers a novel approach to establish the influence of OA neuronal action on their diarrheic effects through a cross talk between ENS and intestine via OA induced NPY secretion. Therefore, the OA mechanisms of toxicity that were long attributed only to the inhibition of protein phosphatases, would require a reevaluation.
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Affiliation(s)
- M Carmen Louzao
- Departamento de Farmacología, Facultad de Veterinaria, Universidad de Santiago de Compostela, Campus Universitario, 27002 Lugo, Spain.
| | - Diego A Fernández
- Departamento de Farmacología, Facultad de Veterinaria, Universidad de Santiago de Compostela, Campus Universitario, 27002 Lugo, Spain
| | - Paula Abal
- Departamento de Farmacología, Facultad de Veterinaria, Universidad de Santiago de Compostela, Campus Universitario, 27002 Lugo, Spain
| | - Maria Fraga
- Departamento de Farmacología, Facultad de Veterinaria, Universidad de Santiago de Compostela, Campus Universitario, 27002 Lugo, Spain
| | - Natalia Vilariño
- Departamento de Farmacología, Facultad de Veterinaria, Universidad de Santiago de Compostela, Campus Universitario, 27002 Lugo, Spain
| | - Mercedes R Vieytes
- Departamento de Fisiología, Facultad de Veterinaria, Universidad de Santiago de Compostela, Campus Universitario, 27002 Lugo, Spain
| | - Luis M Botana
- Departamento de Farmacología, Facultad de Veterinaria, Universidad de Santiago de Compostela, Campus Universitario, 27002 Lugo, Spain.
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Acute cardiotoxicity evaluation of the marine biotoxins OA, DTX-1 and YTX. Toxins (Basel) 2015; 7:1030-47. [PMID: 25826053 PMCID: PMC4417953 DOI: 10.3390/toxins7041030] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2015] [Revised: 03/17/2015] [Accepted: 03/18/2015] [Indexed: 11/29/2022] Open
Abstract
Phycotoxins are marine toxins produced by phytoplankton that can get accumulated in filter feeding shellfish. Human intoxication episodes occur due to contaminated seafood consumption. Okadaic acid (OA) and dynophysistoxins (DTXs) are phycotoxins responsible for a severe gastrointestinal syndrome called diarrheic shellfish poisoning (DSP). Yessotoxins (YTXs) are marine toxins initially included in the DSP class but currently classified as a separated group. Food safety authorities from several countries have regulated the content of DSPs and YTXs in shellfish to protect human health. In mice, OA and YTX have been associated with ultrastructural heart damage in vivo. Therefore, this study explored the potential of OA, DTX-1 and YTX to cause acute heart toxicity. Cardiotoxicity was evaluated in vitro by measuring hERG (human èter-a-go-go gene) channel activity and in vivo using electrocardiogram (ECG) recordings and cardiac damage biomarkers. The results demonstrated that these toxins do not exert acute effects on hERG channel activity. Additionally, in vivo experiments showed that these compounds do not alter cardiac biomarkers and ECG in rats acutely. Despite the ultrastructural damage to the heart reported for these toxins, no acute alterations of heart function have been detected in vivo, suggesting a functional compensation in the short term.
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Soliño L, Sureda FX, Diogène J. Evaluation of okadaic acid, dinophysistoxin-1 and dinophysistoxin-2 toxicity on Neuro-2a, NG108-15 and MCF-7 cell lines. Toxicol In Vitro 2014; 29:59-62. [PMID: 25238672 DOI: 10.1016/j.tiv.2014.09.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2014] [Revised: 05/21/2014] [Accepted: 09/06/2014] [Indexed: 10/24/2022]
Abstract
Marine dinoflagelates from the genus Dynophisis are important producers of Diarrhetic Shellfish Poisoning (DSP) toxins which are responsible for human intoxications. The present work is an approach to study the relative toxicity of DSP toxins effects on Neuro-2a, NG108-15 and MCF-7 cell-lines. Certified standards of okadaic acid (OA), dinophysistoxin-1 (DTX-1) and dinophysistoxin-2 (DTX-2) were used. Our results show that the three toxins exhibit similar cytotoxicity in Neuro-2a and NG108-15 cell lines. Conversely, MCF-7 cells were the least sensitive to these toxins. DTX-1 displayed the most toxic effect in the three tested cell lines.
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Affiliation(s)
- Lucia Soliño
- IRTA, Marine Monitoring Subprogram, Ctra. Poble Nou, Km 5.5, 43540 Sant Carles de la Ràpita, Tarragona, Spain; Universitat Rovira i Virgili, Faculty of Medicine & Health Sciences, Pharmacology Unit, c./ St. Llorenç 21, 43201 Reus, Tarragona, Spain
| | - Francesc X Sureda
- Universitat Rovira i Virgili, Faculty of Medicine & Health Sciences, Pharmacology Unit, c./ St. Llorenç 21, 43201 Reus, Tarragona, Spain
| | - Jorge Diogène
- IRTA, Marine Monitoring Subprogram, Ctra. Poble Nou, Km 5.5, 43540 Sant Carles de la Ràpita, Tarragona, Spain.
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Experimental basis for the high oral toxicity of dinophysistoxin 1: a comparative study of DSP. Toxins (Basel) 2014; 6:211-28. [PMID: 24394641 PMCID: PMC3920258 DOI: 10.3390/toxins6010211] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2013] [Revised: 12/23/2013] [Accepted: 12/28/2013] [Indexed: 01/29/2023] Open
Abstract
Okadaic acid (OA) and its analogues, dinophysistoxin 1 (DTX1) and dinophysistoxin 2 (DTX2), are lipophilic and heat-stable marine toxins produced by dinoflagellates, which can accumulate in filter-feeding bivalves. These toxins cause diarrheic shellfish poisoning (DSP) in humans shortly after the ingestion of contaminated seafood. Studies carried out in mice indicated that DSP poisonous are toxic towards experimental animals with a lethal oral dose 2–10 times higher than the intraperitoneal (i.p.) lethal dose. The focus of this work was to study the absorption of OA, DTX1 and DTX2 through the human gut barrier using differentiated Caco-2 cells. Furthermore, we compared cytotoxicity parameters. Our data revealed that cellular viability was not compromised by toxin concentrations up to 1 μM for 72 h. Okadaic acid and DTX2 induced no significant damage; nevertheless, DTX1 was able to disrupt the integrity of Caco-2 monolayers at concentrations above 50 nM. In addition, confocal microscopy imaging confirmed that the tight-junction protein, occludin, was affected by DTX1. Permeability assays revealed that only DTX1 was able to significantly cross the intestinal epithelium at concentrations above 100 nM. These data suggest a higher oral toxicity of DTX1 compared to OA and DTX2.
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