1
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Zhu C, Liang S, Zan G, Wang X, Gao C, Yan H, Wang X, Zhou J. Selenomethionine Alleviates DON-Induced Oxidative Stress via Modulating Keap1/Nrf2 Signaling in the Small Intestinal Epithelium. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023; 71:895-904. [PMID: 36535023 DOI: 10.1021/acs.jafc.2c07885] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
The small intestinal epithelium is regulated in response to various beneficial or harmful environmental information. Deoxynivalenol (DON), a mycotoxin widely distributed in cereal-based feeds, induces oxidative stress damage in the intestine due to the mitochondrial stress. As a functional nutrient, selenomethionine (Se-Met) is involved in synthesizing several antioxidant enzymes, yet whether it can replenish the intestinal epithelium upon DON exposure remains unknown. Therefore, the in vivo model C57BL/6 mice and the in vitro model MODE-K cells were treated with l-Se-Met and DON alone or in combination to confirm the status of intestinal stem cell (ISC)-driven epithelial regeneration. The results showed that 0.1 mg/kg body weight (BW) Se-Met reinstated the growth performance and integrity of jejunal structure and barrier function in DON-challenged mice. Moreover, Lgr5+ ISCs and PCNA+ mitotic cells in crypts were prominently increased by Se-Met in the presence of DON, concomitant with a significant increase in absorptive cells, goblet cells, and Paneth cells. Simultaneously, crypt-derived jejunal organoids from the Se-Met + DON group exhibited more significant growth advantages ex vivo. Furthermore, Se-Met-stimulated Keap1/Nrf2-dependent antioxidant system (T-AOC and GSH-Px) to inhibit the accumulation of ROS and MDA in the jejunum and serum. Moreover, Se-Met failed to rescue the DON-triggered impairment of cell antioxidant function after Nrf2 perturbation using its specific inhibitor ML385 in MODE-K cells. In conclusion, Se-Met protects ISC-driven intestinal epithelial integrity against DON-induced oxidative stress damage by modulating Keap1/Nrf2 signaling.
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Affiliation(s)
- Chao Zhu
- College of Animal Science, South China Agricultural University/Guangdong Laboratory for Lingnan Modern Agriculture/Guangdong Provincial Key Laboratory of Animal Nutrition Control/National Engineering Research Center for Breeding Swine Industry, Guangzhou 510642, China
| | - Shaojie Liang
- College of Animal Science, South China Agricultural University/Guangdong Laboratory for Lingnan Modern Agriculture/Guangdong Provincial Key Laboratory of Animal Nutrition Control/National Engineering Research Center for Breeding Swine Industry, Guangzhou 510642, China
| | - Gengxiu Zan
- College of Animal Science, South China Agricultural University/Guangdong Laboratory for Lingnan Modern Agriculture/Guangdong Provincial Key Laboratory of Animal Nutrition Control/National Engineering Research Center for Breeding Swine Industry, Guangzhou 510642, China
| | - Xiaofan Wang
- College of Animal Science, South China Agricultural University/Guangdong Laboratory for Lingnan Modern Agriculture/Guangdong Provincial Key Laboratory of Animal Nutrition Control/National Engineering Research Center for Breeding Swine Industry, Guangzhou 510642, China
| | - Chunqi Gao
- College of Animal Science, South China Agricultural University/Guangdong Laboratory for Lingnan Modern Agriculture/Guangdong Provincial Key Laboratory of Animal Nutrition Control/National Engineering Research Center for Breeding Swine Industry, Guangzhou 510642, China
| | - Huichao Yan
- College of Animal Science, South China Agricultural University/Guangdong Laboratory for Lingnan Modern Agriculture/Guangdong Provincial Key Laboratory of Animal Nutrition Control/National Engineering Research Center for Breeding Swine Industry, Guangzhou 510642, China
| | - Xiuqi Wang
- College of Animal Science, South China Agricultural University/Guangdong Laboratory for Lingnan Modern Agriculture/Guangdong Provincial Key Laboratory of Animal Nutrition Control/National Engineering Research Center for Breeding Swine Industry, Guangzhou 510642, China
| | - Jiayi Zhou
- College of Animal Science, South China Agricultural University/Guangdong Laboratory for Lingnan Modern Agriculture/Guangdong Provincial Key Laboratory of Animal Nutrition Control/National Engineering Research Center for Breeding Swine Industry, Guangzhou 510642, China
- HenryFok School of Biology and Agriculture, Shaoguan University, Shaoguan 512005, China
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2
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Wang Y, Li J, Wang X, Wu W, Nepovimova E, Wu Q, Kuca K. Deoxynivalenol and its modified forms: key enzymes, inter-individual and interspecies differences in metabolism. Drug Metab Rev 2022; 54:331-342. [PMID: 35695207 DOI: 10.1080/03602532.2022.2088786] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Deoxynivalenol (DON) and its modified forms, including DON-3-glucoside (DON-3G), pose a major agricultural and food safety issue in the world. Their metabolites are relatively well-characterized; however, their metabolizing enzymes have not been fully explored. UDP-glucuronosyltransferases, 3-O-acetyltransferase, and glutathione S-transferase are involved in the formation of DON-glucuronides, 3-acetyl-DON, and DON-glutathione, respectively. There are interindividual differences in the metabolism of these toxins, including variation with respect to sex. Furthermore, interspecies differences in DON metabolism have been revealed, including differences in the major metabolites of DON, the role of de-acetylation, and the hydrolysis of DON-3G. In this review, we summarized the major enzymes involved in metabolizing DON to its modified forms, focusing on the differences in metabolism of DON and its modified forms between individuals and species. This work provides important insight into the toxicity of DON and its derivatives in humans and animals, and provides scientific basis for the development of safer and more efficient biological detoxification methods.
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Affiliation(s)
- Yating Wang
- College of Life Science, Yangtze University, Jingzhou, China
| | - Jiefeng Li
- College of Life Science, Yangtze University, Jingzhou, China
| | - Xu Wang
- National Reference Laboratory of Veterinary Drug Residues and MAO Key Laboratory for Detection of Veterinary Drug Residues, Huazhong Agricultural University (HZAU), Wuhan, Hubei, China
| | - Wenda Wu
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China.,Department of Chemistry, Faculty of Science, University of Hradec Králové, Hradec Králové, Czech Republic
| | - Eugenie Nepovimova
- Department of Chemistry, Faculty of Science, University of Hradec Králové, Hradec Králové, Czech Republic
| | - Qinghua Wu
- College of Life Science, Yangtze University, Jingzhou, China.,Department of Chemistry, Faculty of Science, University of Hradec Králové, Hradec Králové, Czech Republic
| | - Kamil Kuca
- Department of Chemistry, Faculty of Science, University of Hradec Králové, Hradec Králové, Czech Republic.,Andalusian Research Institute in Data Science and Computational Intelligence (DaSCI), University of Granada, Granada, Spain
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3
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Fæste CK, Solhaug A, Gaborit M, Pierre F, Massotte D. Neurotoxic Potential of Deoxynivalenol in Murine Brain Cell Lines and Primary Hippocampal Cultures. Toxins (Basel) 2022; 14:48. [PMID: 35051025 PMCID: PMC8778863 DOI: 10.3390/toxins14010048] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2021] [Revised: 01/04/2022] [Accepted: 01/06/2022] [Indexed: 01/04/2023] Open
Abstract
Chronic exposure to the mycotoxin deoxynivalenol (DON) from grain-based food and feed affects human and animal health. Known consequences include entereopathogenic and immunotoxic defects; however, the neurotoxic potential of DON has only come into focus more recently due to the observation of behavioural disorders in exposed farm animals. DON can cross the blood-brain barrier and interfere with the homeostasis/functioning of the nervous system, but the underlying mechanisms of action remain elusive. Here, we have investigated the impact of DON on mouse astrocyte and microglia cell lines, as well as on primary hippocampal cultures by analysing different toxicological endpoints. We found that DON has an impact on the viability of both glial cell types, as shown by a significant decrease of metabolic activity, and a notable cytotoxic effect, which was stronger in the microglia. In astrocytes, DON caused a G1 phase arrest in the cell cycle and a decrease of cyclic-adenosine monophosphate (cAMP) levels. The pro-inflammatory cytokine tumour necrosis factor (TNF)-α was secreted in the microglia in response to DON exposure. Furthermore, the intermediate filaments of the astrocytic cytoskeleton were disturbed in primary hippocampal cultures, and the dendrite lengths of neurons were shortened. The combined results indicated DON's considerable potential to interfere with the brain cell physiology, which helps explain the observed in vivo neurotoxicological effects.
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Affiliation(s)
| | - Anita Solhaug
- Toxinology Research Group, Norwegian Veterinary Institute, 1433 Ås, Norway;
| | - Marion Gaborit
- Centre de la Recherche Nationale Scientifique, Institut des Neurosciences Cellulaires et Intégratives, University of Strasbourg, 67000 Strasbourg, France; (M.G.); (F.P.)
| | - Florian Pierre
- Centre de la Recherche Nationale Scientifique, Institut des Neurosciences Cellulaires et Intégratives, University of Strasbourg, 67000 Strasbourg, France; (M.G.); (F.P.)
| | - Dominique Massotte
- Centre de la Recherche Nationale Scientifique, Institut des Neurosciences Cellulaires et Intégratives, University of Strasbourg, 67000 Strasbourg, France; (M.G.); (F.P.)
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4
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Borova S, Schlutt C, Nickel J, Luxenhofer R. A Transient Initiator for Polypeptoids Postpolymerization
α
‐Functionalization via Activation of a Thioester Group. MACROMOL CHEM PHYS 2022. [DOI: 10.1002/macp.202100331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Solomiia Borova
- Functional Polymer Materials, Chair for Advanced Materials Synthesis, Institute for Functional Materials and Biofabrication, Department of Chemistry and Pharmacy Julius‐Maximilans‐University of Würzburg Röntgenring 11 Würzburg Bavaria 97070 Germany
| | - Christine Schlutt
- Functional Polymer Materials, Chair for Advanced Materials Synthesis, Institute for Functional Materials and Biofabrication, Department of Chemistry and Pharmacy Julius‐Maximilans‐University of Würzburg Röntgenring 11 Würzburg Bavaria 97070 Germany
| | - Joachim Nickel
- Department of Tissue Engineering and Regenerative Medicine University Hospital of Würzburg Röntgenring 11 Würzburg Bavaria 97070 Germany
| | - Robert Luxenhofer
- Functional Polymer Materials, Chair for Advanced Materials Synthesis, Institute for Functional Materials and Biofabrication, Department of Chemistry and Pharmacy Julius‐Maximilans‐University of Würzburg Röntgenring 11 Würzburg Bavaria 97070 Germany
- Soft Matter Chemistry, Department of Chemistry and Helsinki Institute of Sustainability Science, Faculty of Science University of Helsinki P.O. Box 55 Helsinki 00014 Finland
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5
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Horky P, Gruberova HA, Aulichova T, Malyugina S, Slama P, Pavlik A, Skladanka J, Skoric M, Skalickova S. Protective effect of a new generation of activated and purified bentonite in combination with yeast and phytogenic substances on mycotoxin challenge in pigs. PLoS One 2021; 16:e0259132. [PMID: 34705867 PMCID: PMC8550360 DOI: 10.1371/journal.pone.0259132] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Accepted: 10/13/2021] [Indexed: 01/17/2023] Open
Abstract
The study aimed to investigate the efficacy of new mycotoxin adsorbents based on purified and activated bentonites combined with yeast and phytogenic compounds in fattening pigs. The experiment involved 96 pigs (31.2±2.4 kg). Control (C) group was fed a diet naturally contaminated with mycotoxins (5 mg/kg deoxynivalenol, DON) without an adsorbent. Treated groups received the feed with mycotoxin adsorbents: purified and activated bentonite (T1), purified and activated bentonite, yeast derivatives, phytogenic substances (T2), and purified, activated, and sulphurated bentonite with phytogenic substances (T3). Evaluated parameters involved growth performance, organ weight, small intestine and liver histopathology, complete blood count, serum biochemistry, antioxidant status of the organism and total and free DON content in urine. In all treated groups, an significant increase in intestinal GSH and GSH/GSSG ratio was observed when compared to C. No significant effects on liver and kidney weight, complete blood count, serum or intestinal malondialdehyde concentration, or total/free DON content in urine were observed. All adsorbents improved histopathological findings in the liver when compared to C. Moreover, T1, and T2 groups showed no presence of inflammatory reaction or necrotic changes in the livers. Although, mycotoxin adsorbents investigated in this study had no significant impact on pig growth performance, they reduced the oxidative stress, and on the tissue level they protected the jejunal tissue and liver parenchyma under deoxynivalenol challenge.
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Affiliation(s)
- Pavel Horky
- Faculty of AgriSciences, Department of Animal Nutrition and Forage Production, Mendel University in Brno, Brno, Czech Republic, European Union
| | - Hana Abigail Gruberova
- Faculty of AgriSciences, Department of Animal Nutrition and Forage Production, Mendel University in Brno, Brno, Czech Republic, European Union
| | - Tereza Aulichova
- Faculty of AgriSciences, Department of Animal Nutrition and Forage Production, Mendel University in Brno, Brno, Czech Republic, European Union
| | - Svetlana Malyugina
- Faculty of AgriSciences, Department of Animal Nutrition and Forage Production, Mendel University in Brno, Brno, Czech Republic, European Union
| | - Petr Slama
- Faculty of AgriSciences, Department of Animal Morphology, Physiology and Genetics, Mendel University in Brno, Brno, Czech Republic, European Union
| | - Ales Pavlik
- Faculty of AgriSciences, Department of Animal Morphology, Physiology and Genetics, Mendel University in Brno, Brno, Czech Republic, European Union
| | - Jiri Skladanka
- Faculty of AgriSciences, Department of Animal Nutrition and Forage Production, Mendel University in Brno, Brno, Czech Republic, European Union
| | - Misa Skoric
- Faculty of Veterinary Medicine, Department of Pathological Morphology and Parasitology, University of Veterinary and Pharmaceutical Sciences Brno, Brno, Czech Republic, European Union
| | - Sylvie Skalickova
- Faculty of AgriSciences, Department of Animal Nutrition and Forage Production, Mendel University in Brno, Brno, Czech Republic, European Union
- * E-mail:
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Wang W, Zhu Y, Abraham N, Li XZ, Kimber M, Zhou T. The Ribosome-Binding Mode of Trichothecene Mycotoxins Rationalizes Their Structure-Activity Relationships. Int J Mol Sci 2021; 22:1604. [PMID: 33562610 PMCID: PMC7914836 DOI: 10.3390/ijms22041604] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 01/29/2021] [Accepted: 02/01/2021] [Indexed: 02/06/2023] Open
Abstract
Trichothecenes are the most prevalent mycotoxins contaminating cereal grains. Some of them are also considered as the virulence factors of Fusarium head blight disease. However, the mechanism behind the structure-activity relationship for trichothecenes remains unexplained. Filling this information gap is a crucial step for developing strategies to manage this large family of mycotoxins in food and feed. Here, we perform an in-depth re-examination of the existing structures of Saccharomyces cerevisiae ribosome complexed with three different trichothecenes. Multiple binding interactions between trichothecenes and 25S rRNA, including hydrogen bonds, nonpolar pi stacking interactions and metal ion coordination interactions, are identified as important binding determinants. These interactions are mainly contributed by the key structural elements to the toxicity of trichothecenes, including the oxygen in the 12,13-epoxide ring and a double bond between C9 and C10. In addition, the C3-OH group also participates in binding. The comparison of three trichothecenes binding to the ribosome, along with their binding pocket architecture, suggests that the substitutions at different positions impact trichothecenes binding in two different patterns. Moreover, the binding of trichothecenes induced conformation changes of several nucleotide bases in 25S rRNA. This then provides a structural framework for understanding the structure-activity relationships apparent in trichothecenes. This study will facilitate the development of strategies aimed at detoxifying mycotoxins in food and feed and at improving the resistance of cereal crops to Fusarium fungal diseases.
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Affiliation(s)
- Weijun Wang
- Guelph Research and Development Centre, Agriculture and Agri-Food Canada, Guelph, ON N1G 5C9, Canada; (W.W.); (Y.Z.); (N.A.); (X.-Z.L.)
| | - Yan Zhu
- Guelph Research and Development Centre, Agriculture and Agri-Food Canada, Guelph, ON N1G 5C9, Canada; (W.W.); (Y.Z.); (N.A.); (X.-Z.L.)
| | - Nadine Abraham
- Guelph Research and Development Centre, Agriculture and Agri-Food Canada, Guelph, ON N1G 5C9, Canada; (W.W.); (Y.Z.); (N.A.); (X.-Z.L.)
- Department of Molecular and Cellular Biology, University of Guelph, Guelph, ON N1G 2W1, Canada;
| | - Xiu-Zhen Li
- Guelph Research and Development Centre, Agriculture and Agri-Food Canada, Guelph, ON N1G 5C9, Canada; (W.W.); (Y.Z.); (N.A.); (X.-Z.L.)
| | - Matthew Kimber
- Department of Molecular and Cellular Biology, University of Guelph, Guelph, ON N1G 2W1, Canada;
| | - Ting Zhou
- Guelph Research and Development Centre, Agriculture and Agri-Food Canada, Guelph, ON N1G 5C9, Canada; (W.W.); (Y.Z.); (N.A.); (X.-Z.L.)
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7
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Sun X, Ji J, Gao Y, Zhang Y, Zhao G, Sun C. Fate of deoxynivalenol and degradation products degraded by aqueous ozone in contaminated wheat. Food Res Int 2020; 137:109357. [DOI: 10.1016/j.foodres.2020.109357] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Revised: 05/19/2020] [Accepted: 05/24/2020] [Indexed: 12/12/2022]
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8
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Flasch M, Bueschl C, Woelflingseder L, Schwartz-Zimmermann HE, Adam G, Schuhmacher R, Marko D, Warth B. Stable Isotope-Assisted Metabolomics for Deciphering Xenobiotic Metabolism in Mammalian Cell Culture. ACS Chem Biol 2020; 15:970-981. [PMID: 32167285 PMCID: PMC7171601 DOI: 10.1021/acschembio.9b01016] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
Xenobiotics are ubiquitous in the environment and modified
in the human body by phase I and II metabolism. Liquid chromatography
coupled to high resolution mass spectrometry is a powerful tool to
investigate these biotransformation products. We present a workflow
based on stable isotope-assisted metabolomics and the bioinformatics
tool MetExtract II for deciphering xenobiotic metabolites produced
by human cells. Its potential was demonstrated by the investigation
of the metabolism of deoxynivalenol (DON), an abundant food contaminant,
in a liver carcinoma cell line (HepG2) and a model for colon carcinoma
(HT29). Detected known metabolites included DON-3-sulfate, DON-10-sulfonate
2, and DON-10-glutathione as well as DON-cysteine. Conjugation with
amino acids and an antibiotic was confirmed for the first time. The
approach allows the untargeted elucidation of human xenobiotic products
in tissue culture. It may be applied to other fields of research including
drug metabolism, personalized medicine, exposome research, and systems
biology to better understand the relevance of in vitro experiments.
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Affiliation(s)
- Mira Flasch
- Department of Food Chemistry and Toxicology, Faculty of Chemistry, University of Vienna, Währinger Straße 38, 1090 Vienna, Austria
| | - Christoph Bueschl
- Department of Agrobiotechnology, IFA-Tulln, Institute of Bioanalytics and Agro-Metabolomics, University of Natural Resources and Life Sciences, Vienna (BOKU), Konrad-Lorenz-Straße 20, 3430 Tulln, Austria
| | - Lydia Woelflingseder
- Department of Food Chemistry and Toxicology, Faculty of Chemistry, University of Vienna, Währinger Straße 38, 1090 Vienna, Austria
| | - Heidi E. Schwartz-Zimmermann
- Department of Agrobiotechnology, IFA-Tulln, Institute of Bioanalytics and Agro-Metabolomics, University of Natural Resources and Life Sciences, Vienna (BOKU), Konrad-Lorenz-Straße 20, 3430 Tulln, Austria
| | - Gerhard Adam
- Department of Applied Genetics and Cell Biology, University of Natural Resources and Life Sciences, Vienna (BOKU), Konrad-Lorenz-Straße 24, 3430 Tulln, Austria
| | - Rainer Schuhmacher
- Department of Agrobiotechnology, IFA-Tulln, Institute of Bioanalytics and Agro-Metabolomics, University of Natural Resources and Life Sciences, Vienna (BOKU), Konrad-Lorenz-Straße 20, 3430 Tulln, Austria
| | - Doris Marko
- Department of Food Chemistry and Toxicology, Faculty of Chemistry, University of Vienna, Währinger Straße 38, 1090 Vienna, Austria
| | - Benedikt Warth
- Department of Food Chemistry and Toxicology, Faculty of Chemistry, University of Vienna, Währinger Straße 38, 1090 Vienna, Austria
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Su N, Liu CL, Chen XP, Fan XX, Ma YC. T-2 toxin cytotoxicity mediated by directly perturbing mitochondria in human gastric epithelium GES-1 cells. J Appl Toxicol 2020; 40:1141-1152. [PMID: 32187393 DOI: 10.1002/jat.3973] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2019] [Revised: 02/16/2020] [Accepted: 03/02/2020] [Indexed: 02/01/2023]
Abstract
T-2 toxin is one of the most toxic trichothecenes and harmful to human health and animal husbandry. The mechanism underlying its growth suppression remains unclear, especially for mitochondrial damage in human gastric epithelial cells. In the present study, we investigated cell death caused by T-2 toxin in a human gastric epithelial cell line (GES-1) and the possible mechanism of T-2-induced cytotoxicity. T-2 strongly reduced the viability of GES-1 cells in a time- and dose-dependent manner within a small range of concentrations. However, when the concentrations of T-2 were >40 nM, there was no concentration dependence, only time dependence. Moreover, T-2 induced apoptosis, with the activation of caspase-3 in GES-1 and mitochondrial membrane potential (MMP) decrease and cytochrome c release. T-2 also resulted in the accumulation of reactive oxygen species (ROS) and DNA damage with a positive signal of p-H2A.X in GES-1 cells. While T-2 caused a MMP decrease, DNA damage and cell death were not blocked by pretreatment with 3 mM glutathione (GSH), a typical scavenger of ROS. The induction of mitochondrial permeability transition pore (mPTP) regulators voltage-dependent anion channel (VDAC1) and cyclophilin D (CypD) were also observed in T-2-treated cells. Interestingly, cyclosporine A (CsA), a CypD inhibitor, significantly reversed the drop in MMP and the DNA damage, as well as ROS accumulation caused by T-2. Additionally, GES-1 cell death could also be protected to some extent by 4, 4'-diisothiocyanatostilbene-2, 2'-disulfonic acid (DIDS), an inhibitor of VDAC1, especially the combination of CsA and DIDS, and 3 mM GSH could further enhance the effect of CsA + DIDS on cell viability. In conclusion, our present findings indicate that the T-2 induced MMP decrease, DNA damage and cell death, as well as ROS accumulation in GES-1 cells, starts with T-2 directly perturbing the mitochondria triggering ROS generation by acting on CypD and VDAC1. This study presents a new viewpoint for evaluating the toxicity of T-2 toxin.
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Affiliation(s)
- Nan Su
- College of Food and Biological Engineering, Henan University of Animal Husbandry and Economy, Zhengzhou, China
| | - Chun-Lei Liu
- College of Health Management, Henan Finance University, Zhengzhou, China
| | - Xiao-Pei Chen
- Faculty of Science, Henan University of Animal Husbandry and Economy, Zhengzhou, China
| | - Xia-Xia Fan
- Department of Pharmacy, Henan Provincial People's Hospital, Department of Pharmacy of Centeral China Fuwai Hospital, Centeral China Fuwai Hospital of Zhengzhou University, Zhengzhou, Henan, China
| | - Yong-Cheng Ma
- Department of Pharmacy, Henan Provincial People's Hospital, Department of Pharmacy of Centeral China Fuwai Hospital, Centeral China Fuwai Hospital of Zhengzhou University, Zhengzhou, Henan, China
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10
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Uhlig S, Ivanova L, Miles CO. Oxidative Release of Thiol-Conjugated Forms of the Mycotoxin 4-Deoxynivalenol. Chem Res Toxicol 2020; 33:515-521. [PMID: 31867960 DOI: 10.1021/acs.chemrestox.9b00385] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Deoxynivalenol (DON) is a trichothecene mycotoxin that is produced by several species of Fusarium, which may infect grain crops. DON, as well as other type-B trichothecenes, contain an α,β-unsaturated carbonyl group that may react with sulfhydryl groups in, for example, amino acids and peptides. Such conjugates have been shown to occur in plants. Nucleophilic addition of thiols to the conjugated double bond in DON afforded several isomeric reaction products, and the thermodynamically favored isomers of DON-10-cysteine and DON-10-glutathione have been prepared and characterized previously. This study reports the preparation and characterization of the kinetically favored DON-10-cysteine isomer. We subsequently studied and compared the rate of the deconjugation reaction of the two DON-10-cysteine isomers and the thermodynamically favored DON-10-glutathione adduct. The deconjugation rate of the thermodynamically favored thiol conjugates was slow with half-lives of weeks even at pH 10.7, while the kinetically favored DON-10-cysteine isomer deconjugated within a few hours, affording free DON. We adapted a simple and rapid oxidation protocol in which the sulfide linkage was oxidized to a sulfoxide or sulfone that, when treated with the base, rapidly eliminated the adducted thiol as its sulfenate or sulfinate to afford free DON. The deconjugation reactions of the sulfoxides and sulfones of thermodynamically favored DON-10-thiols were complete within hours or minutes at pH 10.7, respectively. The increase in deconjugation rates for the kinetically favored DON-10-cysteine were less dramatic. Oxidation of sulfides to sulfoxides is known to occur in vivo, and thus, our data show that thiol-conjugated DON might become bioavailable via sulfide oxidation followed by elimination to regenerate DON. The oxidation-elimination approach could also be useful for the indirect quantification of DON-10-thiol conjugates in plant and animal tissues.
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Affiliation(s)
- Silvio Uhlig
- Toxinology Research Group , Norwegian Veterinary Institute , Ullevålsveien 68 , 0454 Oslo , Norway
| | - Lada Ivanova
- Toxinology Research Group , Norwegian Veterinary Institute , Ullevålsveien 68 , 0454 Oslo , Norway
| | - Christopher O Miles
- Biotoxin Metrology , National Research Council , 1411 Oxford Street , Halifax , NS B3H 3Z1 , Canada
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11
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Biotransformation of the Mycotoxin Enniatin B1 by CYP P450 3A4 and Potential for Drug-Drug Interactions. Metabolites 2019; 9:metabo9080158. [PMID: 31357617 PMCID: PMC6724072 DOI: 10.3390/metabo9080158] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Revised: 07/16/2019] [Accepted: 07/23/2019] [Indexed: 01/08/2023] Open
Abstract
Enniatins (ENNs) are fungal secondary metabolites that frequently occur in grain in temperate climates. Their toxic potency is connected to their ionophoric character and lipophilicity. The biotransformation of ENNs predominantly takes place via cytochrome P450 3A (CYP 3A)-dependent oxidation reactions. Possible interaction with ENNs is relevant since CYP3A4 is the main metabolic enzyme for numerous drugs and contaminants. In the present study, we have determined the kinetic characteristics and inhibitory potential of ENNB1 in human liver microsomes (HLM) and CYP3A4-containing nanodiscs (ND). We showed in both in vitro systems that ENNB1 is mainly metabolised by CYP3A4, producing at least eleven metabolites. Moreover, ENNB1 significantly decreased the hydroxylation rates of the typical CYP3A4-substrate midazolam (MDZ). Deoxynivalenol (DON), which is the most prevalent mycotoxin in grain and usually co-occurrs with the ENNs, was not metabolised by CYP3A4 or binding to its active site. Nevertheless, DON affected the efficiency of this biotransformation pathway both in HLM and ND. The metabolite formation rates of ENNB1 and the frequently used drugs progesterone (PGS) and atorvastatin (ARVS) lactone were noticeably reduced, which indicated a certain affinity of DON to the enzyme with subsequent conformational changes. Our results emphasise the importance of drug-drug interaction studies, also with regard to natural toxins.
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12
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Ichitani M, Okumura H, Nakashima Y, Kinugasa H, Honda M, Kunimoto KK. Spectroscopic characterization of thiol adducts formed in the reaction of 4-methylcatechol with DPPH in the presence of N-acetylcysteine. ACTA ACUST UNITED AC 2018. [DOI: 10.5155/eurjchem.9.4.386-393.1794] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Nucleophiles such as thiol compounds have enhancing effects on the 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activities of polyphenols. Several authors have suggested that regeneration of the catechol structure from o-quinone plays a key role in enhanced radical scavenging activity. We therefore explored the reaction of 4-methyl catechol (MC) with DPPH in the presence of N-acetylcysteine (NACys) to clarify the mechanism underlying activity enhancement. Four types of NACys adducts were isolated and purified by preparative HPLC after the reactions reached equilibrium and their structures were characterized spectroscopically using UV-Vis absorption, NMR, and LC-MS. Oxidation of MC using a periodate resin and subsequent reaction with NACys were also studied. LC-MS analyses revealed that a mono-NACys adduct is produced as the major product in the reaction of MC quinone with NACys, and direct reduction by NACys occurs in reactions with NACys MC quinones.
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Affiliation(s)
- Masaki Ichitani
- Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-Machi, Kanazawa 920-1192, Japan
| | - Hisako Okumura
- Department of Materials Engineering, National Institute of Technology, Nagaoka College, 888 Nishikatakai-Machi, Nagaoka 940-8532, Japan
| | - Yugo Nakashima
- Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-Machi, Kanazawa 920-1192, Japan
| | - Hitoshi Kinugasa
- Central Research Institute, Ito En. Ltd., Shizuoka 421-0516, Japan
| | - Mitsunori Honda
- Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-Machi, Kanazawa 920-1192, Japan
| | - Ko-Ki Kunimoto
- Institute of Liberal Arts and Science, Kanazawa University, Kakuma-Machi, Kanazawa 920-1192, Japan
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Woelflingseder L, Del Favero G, Blažević T, Heiss EH, Haider M, Warth B, Adam G, Marko D. Impact of glutathione modulation on the toxicity of the Fusarium mycotoxins deoxynivalenol (DON), NX-3 and butenolide in human liver cells. Toxicol Lett 2018; 299:104-117. [PMID: 30244016 DOI: 10.1016/j.toxlet.2018.09.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Revised: 09/07/2018] [Accepted: 09/17/2018] [Indexed: 12/21/2022]
Abstract
DON, NX-3 and butenolide (BUT) are secondary metabolites formed by Fusarium graminearum. Evidence for formation of DON-glutathione adducts exists in plants, and also in human liver (HepG2) cells mass spectrometric evidence for GSH-adduct formation was reported. NX-3 is a DON derivative lacking structural features for Thiol-Michael addition, while BUT has the structural requirements (conjugated double bond and keto group). In the present study, we addressed whether these structural differences affect levels of intracellular reactive oxygen species in HepG2 cells, and if intracellular GSH levels influence toxic effects induced by DON, NX-3 and BUT. Pre-treatment with an inhibitor of GSH bio-synthesis, L-buthionine-[S,R]-sulfoximine, aggravated substantially BUT-induced cytotoxicity (≥50 μM, 24 h), but only marginally affected the cytotoxicity of DON and NX-3 indicating that GSH-mediated detoxification is of minor importance in HepG2 cells. We further investigated whether BUT, a compound inducing alone low oral toxicity, might affect the toxicity of DON. Under different experimental designs with respect to pre- and/or co-incubations, BUT was found to contribute to the combinatorial cytotoxicity, exceeding the toxic effect of DON alone. The observed combinatorial effects underline the potential contribution of secondary metabolites like BUT, considered to be alone of low toxicological relevance, to the toxicity of DON or structurally related trichothecenes, arguing for further studies on the toxicological relevance of naturally occurring mixtures.
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Affiliation(s)
- Lydia Woelflingseder
- Department of Food Chemistry and Toxicology, Faculty of Chemistry, University of Vienna, Währingerstrasse 38, 1090 Vienna, Austria.
| | - Giorgia Del Favero
- Department of Food Chemistry and Toxicology, Faculty of Chemistry, University of Vienna, Währingerstrasse 38, 1090 Vienna, Austria.
| | - Tina Blažević
- Department of Pharmacognosy, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria.
| | - Elke H Heiss
- Department of Pharmacognosy, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria.
| | - Maximilian Haider
- Institute for Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9/163, 1060 Vienna, Austria.
| | - Benedikt Warth
- Department of Food Chemistry and Toxicology, Faculty of Chemistry, University of Vienna, Währingerstrasse 38, 1090 Vienna, Austria.
| | - Gerhard Adam
- Department of Applied Genetics and Cell Biology, University of Natural Resources and Life Sciences, Vienna (BOKU), Konrad-Lorenz-Strasse 24, 3430 Tulln, Austria.
| | - Doris Marko
- Department of Food Chemistry and Toxicology, Faculty of Chemistry, University of Vienna, Währingerstrasse 38, 1090 Vienna, Austria.
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14
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Miles CO. Rapid and Convenient Oxidative Release of Thiol-Conjugated Forms of Microcystins for Chemical Analysis. Chem Res Toxicol 2017; 30:1599-1608. [PMID: 28595008 DOI: 10.1021/acs.chemrestox.7b00121] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Microcystins are potent cyclic heptapeptide toxins found in some cyanobacteria, and usually contain an α,β-unsaturated carbonyl group that is readily conjugated to thiol-containing amino acids, peptides, and proteins in vivo and in vitro. Methods for deconjugating these types of adducts have recently been reported, but the reactions are slow or result in derivatized microcystins. Mercaptoethanol derivatives of a range of microcystins were therefore used as model compounds to develop deconjugation procedures in which the dialkyl sulfide linkage was oxidized to a sulfoxide or sulfone that, when treated with base, rapidly eliminated the adducted thiol as its sulfenate or sulfinate via β-elimination to afford free microcystins with the α,β-unsaturated carbonyl group intact. These free microcystins can be analyzed by LC/MS to determine the toxin profile of bound microcystins. The method was tested on Cys- and GSH-derivatives of [Dha7]MC-LR. In solution, the deconjugation reactions were complete within minutes at pH 10.7 and within a few hours at pH 9.2. Oxidation of sulfides to sulfoxides is easier and more rapid than oxidation to sulfones, allowing the use of milder oxidants and shorter reaction times. Oxidation of any methionine residues present in the microcystins occurs inevitably during these procedures, and interpretation of the microcystin profile obtained by LC/MS analysis needs to take this into account. Oxidation of tryptophan residues and degradation of microcystins by excess oxidant were circumvented by the addition of Me2SO as a sacrificial reducing agent. These methods may be useful for other compounds that undergo conjugation via thia-Michael addition, such as acrylamide and deoxynivalenol. Oxidation of sulfides to sulfoxides can occur in vivo and could affect the bioavailability of toxins and drugs conjugated via thia-Michael addition, potentially exacerbating oxidative stress by catalytically converting GSH to its sulfenate via conjugation, oxidation, and elimination to regenerate the free toxin.
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Affiliation(s)
- Christopher O Miles
- Norwegian Veterinary Institute , P.O. Box 750 Sentrum, N-0106 Oslo, Norway.,National Research Council , 1411 Oxford Street, Halifax, NS B3H 3Z1, Canada
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15
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Selectivity of commercial immunoaffinity columns for modified forms of the mycotoxin 4-deoxynivalenol (DON). J Chromatogr B Analyt Technol Biomed Life Sci 2017; 1061-1062:322-326. [PMID: 28780485 DOI: 10.1016/j.jchromb.2017.07.017] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2017] [Revised: 06/25/2017] [Accepted: 07/09/2017] [Indexed: 11/20/2022]
Abstract
Commercial immunoaffinity columns (IACs) are today available for all major mycotoxins. However, manufacturers give usually no or very limited information on the epitope, i.e. the specific part of the toxin molecule that binds to the antibody. 4-Deoxynivalenol (DON) is a trichothecene mycotoxin that is produced by plant pathogenic field fungi and is regulated in many countries worldwide. DON was shown to be biotransformed via different metabolic pathways, and thus many different biotransformation products may be found in different products or organisms. In addition, several structurally similar mycotoxins may co-occur with DON. We compared five commercial IACs for their retention of a range of DON derivatives modified in the C-3, C-8, C-10, C-13 or C-15 positions, as well as nivalenol (NIV) and T-2 tetraol. The DON-derivatives were deepoxy-DON, DON 3-, 8- and 15-O-β-d-glucuronides, 3- and 15-O-acetyl-DON, DON-3-O-β-d-glucoside, 10- and 13-cysteinyl-adducts of DON, and the 13-mercaptoethanol and 10,13-dimercaptoethanol adducts of DON. The C-3 derivatives and deepoxy-DON were retained by most of the columns. Only one of the five IACs retained C-15 and C-8 derivatives, but it did not retain C-3 derivatives or deepoxy-DON. The antibodies in two of the IACs bound C-10 conjugates, but C-13 derivatives were not retained by any of the columns. This study shows that all of the antibodies in commercial IACs bind a range of DON derivatives, especially those that are modified at C-3. NIV was retained by three of the columns, and T-2 tetraol was partially retained by one IAC.
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16
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Glutathione-Conjugates of Deoxynivalenol in Naturally Contaminated Grain Are Primarily Linked via the Epoxide Group. Toxins (Basel) 2016; 8:toxins8110329. [PMID: 27845722 PMCID: PMC5127126 DOI: 10.3390/toxins8110329] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Revised: 10/02/2016] [Accepted: 11/07/2016] [Indexed: 12/03/2022] Open
Abstract
A glutathione (GSH) adduct of the mycotoxin 4-deoxynivalenol (DON), together with a range of related conjugates, has recently been tentatively identified by LC-MS of DON-treated wheat spikelets. In this study, we prepared samples of DON conjugated at the 10- and 13-positions with GSH, Cys, CysGly, γ-GluCys and N-acetylcysteine (NAC). The mixtures of conjugates were used as standards for LC-HRMS analysis of one of the DON-treated wheat spikelet samples, as well as 19 Norwegian grain samples of spring wheat and 16 grain samples of oats that were naturally-contaminated with DON at concentrations higher than 1 mg/kg. The artificially-contaminated wheat spikelets contained conjugates of GSH, CysGly and Cys coupled at the olefinic 10-position of DON, whereas the naturally-contaminated harvest-ripe grain samples contained GSH, CysGly, Cys, and NAC coupled mainly at the 13-position on the epoxy group. The identities of the conjugates were confirmed by LC-HRMS comparison with authentic standards, oxidation to the sulfoxides with hydrogen peroxide, and examination of product-ion spectra from LC-HRMS/MS analysis. No γ-GluCys adducts of DON were detected in any of the samples. The presence of 15-O-acetyl-DON was demonstrated for the first time in Norwegian grain. The results indicate that a small but significant proportion of DON is metabolized via the GSH-conjugation pathway in plants. To our knowledge, this is the first report of in vivo conjugation of trichothecenes via their epoxy group, which has generally been viewed as unreactive. Because conjugation at the 13-position of DON and other trichothecenes has been shown to be irreversible, this type of conjugate may prove useful as a biomarker of exposure to DON and other 12,13-epoxytrichothecenes.
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17
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Pentahydroxyscirpene-Producing Strains, Formation In Planta, and Natural Occurrence. Toxins (Basel) 2016; 8:toxins8100295. [PMID: 27754401 PMCID: PMC5086655 DOI: 10.3390/toxins8100295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2016] [Revised: 09/30/2016] [Accepted: 10/08/2016] [Indexed: 11/17/2022] Open
Abstract
Trichothecenes are a class of structurally diverse mycotoxins with more than 200 naturally occurring compounds. Previously, a new compound, pentahydroxyscirpene (PHS), was reported as a byproduct of a nivalenol producing Fusarium strain, IFA189. PHS contains a hydroxy group at C-8 instead of the keto group of type B trichothecenes. In this work, we demonstrate that IFA189 belongs to the species Fusarium kyushuense using molecular tools. Production of PHS in vitro was also observed for several isolates of other Fusarium species producing nivalenol. Furthermore, we report the formation of 4-acetyl-PHS by F. kyushuense on inoculated rice. Wheat ears of the variety Remus were infected with IFA189 and the in planta production of PHS was confirmed. Natural occurrence of PHS was verified in barley samples from the Czech Republic using a liquid chromatographic-tandem mass spectrometric method validated for this purpose. Toxicity of PHS to wheat ribosomes was evaluated with a coupled in vitro transcription and translation assay, which showed that PHS inhibits protein biosynthesis slightly less than nivalenol and deoxynivalenol.
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18
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Wei N, Hu L, Song L, Gan N. Microcystin-Bound Protein Patterns in Different Cultures of Microcystis aeruginosa and Field Samples. Toxins (Basel) 2016; 8:toxins8100293. [PMID: 27754336 PMCID: PMC5086653 DOI: 10.3390/toxins8100293] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2016] [Revised: 10/06/2016] [Accepted: 10/08/2016] [Indexed: 11/16/2022] Open
Abstract
Micocystin (MC) exists in Microcystis cells in two different forms, free and protein-bound. We examined the dynamic change in extracellular free MCs, intracellular free MCs and protein-bound MCs in both batch cultures and semi-continuous cultures, using high performance liquid chromatography and Western blot. The results showed that the free MC per cell remained constant, while the quantity of protein-bound MCs increased with the growth of Microcystis cells in both kinds of culture. Significant changes in the dominant MC-bound proteins occurred in the late exponential growth phase of batch cultures, while the dominant MC-bound proteins in semi-continuous cultures remained the same. In field samples collected at different months in Lake Taihu, the dominant MC-bound proteins were shown to be similar, but the amount of protein-bound MC varied and correlated with the intracellular MC content. We identified MC-bound proteins by two-dimensional electrophoresis immunoblots and mass spectrometry. The 60 kDa chaperonin GroEL was a prominent MC-bound protein. Three essential glycolytic enzymes and ATP synthase alpha subunit were also major targets of MC-binding, which might contribute to sustained growth in semi-continuous culture. Our results indicate that protein-bound MC may be important for sustaining growth and adaptation of Microcystis sp.
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Affiliation(s)
- Nian Wei
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China.
- University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Lili Hu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China.
- University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Lirong Song
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China.
| | - Nanqin Gan
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China.
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19
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Stanic A, Uhlig S, Sandvik M, Rise F, Wilkins AL, Miles CO. Characterization of Deoxynivalenol-Glutathione Conjugates Using Nuclear Magnetic Resonance Spectroscopy and Liquid Chromatography-High-Resolution Mass Spectrometry. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2016; 64:6903-6910. [PMID: 27548277 DOI: 10.1021/acs.jafc.6b02853] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Glutathione (GSH) conjugates of the mycotoxin 4-deoxynivalenol (DON), 1, have been detected in plants by LC-MS, but their identities were not confirmed due to a lack of standards. We have synthesized DON-GSH conjugates in alkaline solution. The major products 2 and 5 were isolated and their structures determined by mass spectrometry and NMR spectroscopy as GSH adducts at C-13 and C-10 (via epoxide and Michael addition, respectively) of 1. Other Michael addition products were also tentatively identified by LC-MS. Concentrations of 2 and 5 were determined by quantitative NMR and are suitable for use as quantitative standards for LC-MS studies of plant and animal metabolism of 1. LC-MS showed that in the presence of human glutathione S-transferases of the alpha and mu classes, the reaction of DON and GSH proceeded with a half-life of 17 h, identical with the rate of the uncatalyzed reaction rate, indicating an absence of catalysis.
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Affiliation(s)
- Ana Stanic
- Norwegian Veterinary Institute , P.O. Box 750, Sentrum, NO-0106 Oslo, Norway
- Department of Chemistry, University of Oslo , P.O. Box 1033, Blindern, NO-0315 Oslo, Norway
| | - Silvio Uhlig
- Norwegian Veterinary Institute , P.O. Box 750, Sentrum, NO-0106 Oslo, Norway
| | - Morten Sandvik
- Norwegian Veterinary Institute , P.O. Box 750, Sentrum, NO-0106 Oslo, Norway
| | - Frode Rise
- Department of Chemistry, University of Oslo , P.O. Box 1033, Blindern, NO-0315 Oslo, Norway
| | - Alistair L Wilkins
- Norwegian Veterinary Institute , P.O. Box 750, Sentrum, NO-0106 Oslo, Norway
- Chemistry Department, University of Waikato , Private Bag 3105, 3240 Hamilton, New Zealand
| | - Christopher O Miles
- Norwegian Veterinary Institute , P.O. Box 750, Sentrum, NO-0106 Oslo, Norway
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20
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Foroud NA, Shank RA, Kiss D, Eudes F, Hazendonk P. Solvent and Water Mediated Structural Variations in Deoxynivalenol and Their Potential Implications on the Disruption of Ribosomal Function. Front Microbiol 2016; 7:1239. [PMID: 27582730 PMCID: PMC4987352 DOI: 10.3389/fmicb.2016.01239] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2016] [Accepted: 07/25/2016] [Indexed: 12/25/2022] Open
Abstract
Fusarium head blight (FHB) is a disease of cereal crops caused by trichothecene producing Fusarium species. Trichothecenes, macrocylicic fungal metabolites composed of three fused rings (A-C) with one epoxide functionality, are a class of mycotoxins known to inhibit protein synthesis in eukaryotic ribosomes. These toxins accumulate in the kernels of infected plants rendering them unsuitable for human and animal consumption. Among the four classes of trichothecenes (A-D) A and B are associated with FHB, where the type B trichothecene deoxynivalenol (DON) is most relevant. While it is known that these toxins inhibit protein synthesis by disrupting peptidyl transferase activity, the exact mechanism of this inhibition is poorly understood. The three-dimensional structures and H-bonding behavior of DON were evaluated using one- and two-dimensional nuclear magnetic resonance (NMR) spectroscopy techniques. Comparisons of the NMR structure presented here with the recently reported crystal structure of DON bound in the yeast ribosome reveal insights into the possible toxicity mechanism of this compound. The work described herein identifies a water binding pocket in the core structure of DON, where the 3OH plays an important role in this interaction. These results provide preliminary insights into how substitution at C3 reduces trichothecene toxicity. Further investigations along these lines will provide opportunities to develop trichothecene remediation strategies based on the disruption of water binding interactions with 3OH.
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Affiliation(s)
- Nora A. Foroud
- Lethbridge Research and Development Centre, Agriculture and Agri-Food CanadaLethbridge, AB, Canada
| | - Roxanne A. Shank
- Department of Chemistry and Biochemistry, University of LethbridgeLethbridge, AB, Canada
| | - Douglas Kiss
- Department of Chemistry and Biochemistry, University of LethbridgeLethbridge, AB, Canada
| | - François Eudes
- Department of Chemistry and Biochemistry, University of LethbridgeLethbridge, AB, Canada
| | - Paul Hazendonk
- Lethbridge Research and Development Centre, Agriculture and Agri-Food CanadaLethbridge, AB, Canada
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21
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Kecskes-Nagy E, Korzenszky P, Sembery P. The role of color sorting machine in reducing food safety risks. POTRAVINARSTVO 2016. [DOI: 10.5219/511] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
It is the very difficult problem how we can decrease food safety risks in the product, which was polluted in process of cropping. According to professional literature almost the prevention is considered as an exclusive method to keep below safe level the content of DON toxin. The source of food safety in food chain is that the primary products suit the food safety requirements. It is a very difficult or sometimes it is not possible to correct food safety risk factors - which got into the products during cultivation - in the course of processing. Such factor is fusariotoxin in fodder and bread wheat. DON toxin is the most frequent toxin in cereals. The objective of the searching was to investigate, if it is possible to decrease DON toxin content of durum wheat and to minimize the food safety risk by application milling technology with good production practice and technological conditions. The samples were taken in the first phase of milling technology just before and after color sorting. According to measuring results Sortex Z+ optical sorting decreased DON toxin content of wheat. This mean that the food safety risks can be reduced by Sortex Z+ optical sorting machine. Our experiments proved if there is color sorting in the cleaning process preceding the milling of wheat then a part of the grain of wheat infected by Fusarium sp. can be selected. This improves the food safety parameters of given lot of wheat and decrease the toxin content. The flour made from contaminated grains of wheat can be a serious food safety risk. We would like to support scientifically the technical development of milling technology with our experimental data.
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Stanic A, Uhlig S, Solhaug A, Rise F, Wilkins AL, Miles CO. Preparation and Characterization of Cysteine Adducts of Deoxynivalenol. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2016; 64:4777-4785. [PMID: 27229448 DOI: 10.1021/acs.jafc.6b01158] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Conjugation with the biologically relevant thiol glutathione is one of the metabolic pathways for the mycotoxin deoxynivalenol (DON) in wheat. The occurrence of putative DON-cysteine conjugates has also been shown in wheat, likely in part as a result of degradation of the glutathione conjugates. It was reported that thiols react in vitro with DON at two positions: reversibly at C-10 of the α,β-unsaturated ketone and irreversibly at C-13 of the epoxy group. We synthesized pure DON-cysteine adducts and made analytical standards using quantitative NMR experiments. Compounds were characterized using NMR and LC-HRMS/MS and tested in vitro for toxicity. Cysteine conjugates were much less toxic than DON at the same concentration, and LC-HRMS analysis demonstrated that there was no detectable metabolism of the conjugates in human monocytes or human macrophages.
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Affiliation(s)
- Ana Stanic
- Norwegian Veterinary Institute , P.O. Box 750, Sentrum, NO-0106 Oslo, Norway
- Department of Chemistry, University of Oslo , P.O. Box 1033, Blindern, NO-0315 Oslo, Norway
| | - Silvio Uhlig
- Norwegian Veterinary Institute , P.O. Box 750, Sentrum, NO-0106 Oslo, Norway
| | - Anita Solhaug
- Norwegian Veterinary Institute , P.O. Box 750, Sentrum, NO-0106 Oslo, Norway
| | - Frode Rise
- Department of Chemistry, University of Oslo , P.O. Box 1033, Blindern, NO-0315 Oslo, Norway
| | - Alistair L Wilkins
- Norwegian Veterinary Institute , P.O. Box 750, Sentrum, NO-0106 Oslo, Norway
- Chemistry Department, University of Waikato , Private Bag 3105, 3240 Hamilton, New Zealand
| | - Christopher O Miles
- Norwegian Veterinary Institute , P.O. Box 750, Sentrum, NO-0106 Oslo, Norway
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23
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Uhlig S, Ivanova L, Fæste CK. Correction to Enzyme-Assisted Synthesis and Structural Characterization of the 3-, 8-, and 15-Glucuronides of Deoxynivalenol. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2016; 64:3732. [PMID: 27119591 DOI: 10.1021/acs.jafc.6b01413] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
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24
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Miles CO, Sandvik M, Nonga HE, Ballot A, Wilkins AL, Rise F, Jaabaek JAH, Loader JI. Conjugation of Microcystins with Thiols Is Reversible: Base-Catalyzed Deconjugation for Chemical Analysis. Chem Res Toxicol 2016; 29:860-70. [DOI: 10.1021/acs.chemrestox.6b00028] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Morten Sandvik
- Norwegian Veterinary Institute, P.O. Box 750 Sentrum, N-0106 Oslo, Norway
| | - Hezron E. Nonga
- Norwegian Veterinary Institute, P.O. Box 750 Sentrum, N-0106 Oslo, Norway
| | - Andreas Ballot
- Norwegian Veterinary Institute, P.O. Box 750 Sentrum, N-0106 Oslo, Norway
| | - Alistair L. Wilkins
- Norwegian Veterinary Institute, P.O. Box 750 Sentrum, N-0106 Oslo, Norway
- Chemistry Department, University of Waikato, Private Bag 3105, 3240 Hamilton, New Zealand
| | - Frode Rise
- Department
of Chemistry, University of Oslo, P.O. Box 1033, N-0315 Oslo, Norway
| | - J. Atle H. Jaabaek
- Department
of Chemistry, University of Oslo, P.O. Box 1033, N-0315 Oslo, Norway
| | - Jared I. Loader
- AgResearch Ltd., Ruakura Research Centre, Bisley Road, Private Bag 3123, Hamilton 3240, New Zealand
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