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Bohlen D, Karlstetter D, Leidner J, Kremer JI, Kirsch V, Eisenbrand G, Bakuradze T, Stegmüller S, Richling E. Dosimetry of human exposure to furan and 2-methylfuran by monitoring urinary biomarkers. Food Chem Toxicol 2024; 189:114774. [PMID: 38824992 DOI: 10.1016/j.fct.2024.114774] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Revised: 05/28/2024] [Accepted: 05/28/2024] [Indexed: 06/04/2024]
Abstract
Furan and 2-methylfuran (2-MF) can form during food processing and accumulate in foods at various concentrations depending on processing technology and beverage/meal preparation methods applied prior to consumption. Here, we report a controlled dosimetry study with 20 volunteers (10 male, 10 female) to monitor dietary furan/2-MF exposure. The volunteers followed an eleven-day furan/2-MF-restricted diet in which they consumed freshly prepared coffee brew containing known amounts of furan and 2-MF on two separate occasions (250 mL and 500 mL on days 4 and 8, respectively). Urine was collected over the whole study period and analyzed for key metabolites derived from the primary oxidative furan metabolite cis-2-butene-1,4-dial (BDA) (i.e., Lys-BDA, AcLys-BDA and cyclic GSH-BDA) and the primary 2-MF metabolite acetylacrolein (AcA, 4-oxo-pent-2-enal) (i.e., Lys-AcA and AcLys-AcA). A previously established stable isotope dilution analysis (SIDA) method was utilized. Excretion kinetics revealed two peaks (at 0-2 and 24-36 h) for AcLys-BDA, Lys-BDA, AcLysAcA and LysAcA, whereas GSH-BDA showed a single peak. Notably, women on average excreted the metabolite GSH-BDA slightly faster than men, indicating gender differences. Overall, the study provided further insights into the spectrum of possible biomarkers of furan and 2-methyfuran metabolites occurring in the urine of volunteers after coffee consumption.
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Affiliation(s)
- D Bohlen
- Department of Chemistry, Division of Food Chemistry and Toxicology, RPTU Kaiserslautern-Landau, Erwin-Schrödinger-Straße 52, 67663, Kaiserslautern, Germany
| | - D Karlstetter
- Department of Chemistry, Division of Food Chemistry and Toxicology, RPTU Kaiserslautern-Landau, Erwin-Schrödinger-Straße 52, 67663, Kaiserslautern, Germany
| | - J Leidner
- Department of Chemistry, Division of Food Chemistry and Toxicology, RPTU Kaiserslautern-Landau, Erwin-Schrödinger-Straße 52, 67663, Kaiserslautern, Germany
| | - J I Kremer
- Department of Chemistry, Division of Food Chemistry and Toxicology, RPTU Kaiserslautern-Landau, Erwin-Schrödinger-Straße 52, 67663, Kaiserslautern, Germany
| | - V Kirsch
- Department of Chemistry, Division of Food Chemistry and Toxicology, RPTU Kaiserslautern-Landau, Erwin-Schrödinger-Straße 52, 67663, Kaiserslautern, Germany
| | - G Eisenbrand
- Department of Chemistry, Division of Food Chemistry and Toxicology, RPTU Kaiserslautern-Landau, Erwin-Schrödinger-Straße 52, 67663, Kaiserslautern, Germany
| | - T Bakuradze
- Department of Chemistry, Division of Food Chemistry and Toxicology, RPTU Kaiserslautern-Landau, Erwin-Schrödinger-Straße 52, 67663, Kaiserslautern, Germany
| | - S Stegmüller
- Department of Chemistry, Division of Food Chemistry and Toxicology, RPTU Kaiserslautern-Landau, Erwin-Schrödinger-Straße 52, 67663, Kaiserslautern, Germany
| | - E Richling
- Department of Chemistry, Division of Food Chemistry and Toxicology, RPTU Kaiserslautern-Landau, Erwin-Schrödinger-Straße 52, 67663, Kaiserslautern, Germany.
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Han Y, Cheng S, Guo F, Xiong J, Ji L. Mechanistic and predictive studies on the oxidation of furans by cytochrome P450: A DFT study. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2024; 279:116460. [PMID: 38781888 DOI: 10.1016/j.ecoenv.2024.116460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2024] [Revised: 04/27/2024] [Accepted: 05/12/2024] [Indexed: 05/25/2024]
Abstract
Furan-containing compounds distribute widely in food, herbal medicines, industrial synthetic products, and environmental media. These compounds can undergo oxidative metabolism catalyzed by cytochrome P450 enzymes (CYP450) within organisms, which may produce reactive products, possibly reacting with biomolecules to induce toxic effects. In this work, we performed DFT calculations to investigate the CYP450-mediated metabolic mechanism of furan-ring oxidation using 2-methylfuran as a model substrate, meanwhile, we studied the regioselective competition of another hydroxylation reaction involving methyl group of 2-methylfuran. As a result, we found the toxicological-relevant cis-enedione product can be produced from O-addition directly via a concerted manner without formation of an epoxide intermediate as traditionally believed. Moreover, our calculations demonstrate the kinetic and thermodynamic feasibility of both furan-ring oxidation and methyl hydroxylation pathways, although the former pathway is a bit more favorable. We then constructed a linear model to predict the rate-limiting activation energies (ΔE*) of O-addition with 11 diverse furan substates based on their adiabatic ionization potentials (AIPs) and condensation Fukui functions (CFFs). The results show a good predictive ability (R2=0.94, Q2CV=0.87). Therefore, AIP and CFF with clear physichem meanings relevant to the mechanism, emerge as pivotal molecular descriptors to enable the fast prediction of furan-ring oxidation reactivities for quick insight into the toxicological risk of furans, using just ground-state calculations.
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Affiliation(s)
- Ye Han
- School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China
| | - Shiyang Cheng
- School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China.
| | - Fangjie Guo
- School of Management Engineering and Electronic Commerce, Zhejiang Gongshang University, Hangzhou 310018, China
| | - Jibing Xiong
- School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China
| | - Li Ji
- School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China.
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3
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Zhang Y, He H, Meng D, Zhu L, Jia W, Liu S, Jiao J, Ren R, Zhang Y. Rewiring cis-2-butene-1,4-dial mediated urinary metabolomics fingerprints of short-term exposure to furan. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 920:170946. [PMID: 38360302 DOI: 10.1016/j.scitotenv.2024.170946] [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: 12/26/2023] [Revised: 02/10/2024] [Accepted: 02/11/2024] [Indexed: 02/17/2024]
Abstract
Furan represents one of the dietary-sourced persistent organic pollutants and thermal processing contaminants. Given its widespread occurrence in food and various toxicological effects, accurately assessing furan exposure is essential for informing public health risks. Furan is metabolized to a reactive primary product, cis-2-butene-1,4-dial (BDA) upon absorption. Some of the resulting BDA-derived metabolites have been proposed as potential exposure biomarkers of furan. However, the lack of quantification for recognized and feasible furan biomarkers has hampered the development of internal exposure risk assessment of furan. In this study, we employed reliable non-targeted metabolomics techniques to uncover urinary furan metabolites and elucidate their chemical structures. We characterized 8 reported and 11 new furan metabolites derived from the binding of BDA with glutathione (GSH), biogenic amines, and/or amino acids in the urine of male rats subjected to varying doses of furan. Notably, a mono-GSH-BDA adduct named cyclic GSH-BDA emerged as a highly prospective specific biomarker of furan exposure, as determined by an ultrahigh-performance liquid chromatography-tandem mass spectrometry method. Cyclic GSH-BDA demonstrated a robust mass spectrometry ion response intensity and exhibited evident time- and dose response. Additionally, we conducted a comprehensive profiling of the kinetics of potential furan biomarkers over time to capture the metabolic dynamics of furan in vivo. Most urinary furan metabolites reached peak concentrations at either the first (3 h) or second (6 h) sampling time point and were largely eliminated within 36 h following furan treatment. The present study provides novel insights into furan metabolism and sheds light on the biomonitoring of furan exposure.
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Affiliation(s)
- Yiju Zhang
- Department of Gastroenterology, The First Affiliated Hospital, Zhejiang University School of Medicine; Zhejiang Key Laboratory for Agro-Food Processing, College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, Zhejiang, China
| | - Huali He
- Laboratory of Chemistry and Physics, Hangzhou Center for Disease Control and Prevention, Hangzhou 310021, Zhejiang, China
| | - Denghui Meng
- Department of Gastroenterology, The First Affiliated Hospital, Zhejiang University School of Medicine; Zhejiang Key Laboratory for Agro-Food Processing, College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, Zhejiang, China
| | - Li Zhu
- Department of Gastroenterology, The First Affiliated Hospital, Zhejiang University School of Medicine; Zhejiang Key Laboratory for Agro-Food Processing, College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, Zhejiang, China
| | - Wei Jia
- Department of Gastroenterology, The First Affiliated Hospital, Zhejiang University School of Medicine; Zhejiang Key Laboratory for Agro-Food Processing, College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, Zhejiang, China
| | - Shaoying Liu
- Laboratory of Chemistry and Physics, Hangzhou Center for Disease Control and Prevention, Hangzhou 310021, Zhejiang, China
| | - Jingjing Jiao
- Department of Nutrition, Zhejiang University School of Public Health; Department of Endocrinology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310058, Zhejiang, China
| | - Ren Ren
- Laboratory of Chemistry and Physics, Hangzhou Center for Disease Control and Prevention, Hangzhou 310021, Zhejiang, China.
| | - Yu Zhang
- Department of Gastroenterology, The First Affiliated Hospital, Zhejiang University School of Medicine; Zhejiang Key Laboratory for Agro-Food Processing, College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, Zhejiang, China.
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4
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Li W, Hu Z, Jia C, Guo W, Li W, Peng Y, Zheng J. Mechanism-based cytotoxicity trend prediction of furan-containing pollutants present in a mixture. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2024; 345:123511. [PMID: 38325514 DOI: 10.1016/j.envpol.2024.123511] [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: 09/06/2023] [Revised: 02/02/2024] [Accepted: 02/04/2024] [Indexed: 02/09/2024]
Abstract
Human exposure to furan-containing pollutants (FCPs) has raised concerns due to their high risk of toxicity. A substantial number of approximately 8500 recorded compounds containing a furan ring exist which have been analytically or in biologically studied. A significant portion of these compounds is found in the everyday environments of individuals, particularly when ingested through food. Consequently, there is a need for a universal approach to rapidly predict the potential toxicity trends of FCPs. In this study, we developed a bromine labeling-based platform that combines LC-ICP-MS and LC-ESI-MS techniques to absolutely quantify FCP-induced protein adduction. The LC-ESI-MS approach facilitated the identification of FCP-derived protein adducts and optimized liquid chromatographic conditions for analyte separation. By employing a well-designed bromine-containing compound as a general internal standard, LC-ICP-MS-based technique enabled to absolutely assess bromine-labeled protein adduction. The protein adduction efficiencies of furan, 2-methylfuran, and 2,5-dimethylfuran were found to be 2.68, 2.90, and 0.37 molecules per 10,000 FCP molecules that primary hepatocytes received, respectively. Furthermore, we observed that 2-methylfuran exhibited the highest cytotoxicity, followed by furan and 2,5-dimethylfuran, which aligned with the order of their protein adduction. Thus, the protein adduction efficiency of FCPs could serve as a potential index for predicting their toxicity trends.
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Affiliation(s)
- Wei Li
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning, 110016, PR China
| | - Zixia Hu
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning, 110016, PR China
| | - Chenyang Jia
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning, 110016, PR China
| | - Wei Guo
- Agilent Technologies (China) Co., Ltd, Beijing, 100102, PR China
| | - Weiwei Li
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, Guiyang, Guizhou, 550025, PR China
| | - Ying Peng
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning, 110016, PR China
| | - Jiang Zheng
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning, 110016, PR China; State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, Guiyang, Guizhou, 550025, PR China; Key Laboratory of Environmental Pollution, Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guiyang, 550025, PR China.
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5
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Muńko M, Ciesielska K, Hoffmann M, Pluskota-Karwatka D. Structural characterisation and pH-dependent preference of pyrrole cross-link isoforms from reactions of oxoenal with cysteine and lysine side chains as model systems. Amino Acids 2023; 55:1073-1082. [PMID: 37432478 PMCID: PMC10564825 DOI: 10.1007/s00726-023-03295-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Accepted: 06/15/2023] [Indexed: 07/12/2023]
Abstract
In this study, we subjected 5,5-diethoxy-4-oxopent-2-enal (DOPE), a model amino acids cross-linking reagent, to reactions with N-acetylcysteine (Ac-Cys) and Nα-acetyllysine (Ac-Lys), and identified three pyrrole cross-links. The compounds were isolated and their structures were rigorously determined by spectrometric and spectroscopic methods, including 2D NMR experiments. The use of 2D NMR spectroscopy was crucial to determine the position of the substituents in the pyrrole rings. The products were identified as 2,4-, 2,3-, and 2,5-substituted pyrroles. The data obtained from their structural characterisation can help similar studies on amino acids modifications induced by analogous bifunctional carbonyl compounds. Our results show that the study of pathways in which model electrophiles modify amino acids may be helpful for similar studies dealing with identification of structural changes in cysteine- and lysine-containing proteins associated with oxidative stress.
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Affiliation(s)
- Malwina Muńko
- Center for Advanced Technology, Adam Mickiewicz University, Uniwersytetu Poznańskiego 10, 61-614, Poznan, Poland
| | - Karolina Ciesielska
- Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, 61-614, Poznan, Poland
| | - Marcin Hoffmann
- Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, 61-614, Poznan, Poland
| | - Donata Pluskota-Karwatka
- Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, 61-614, Poznan, Poland.
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6
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Wang Y, Czabala P, Raj M. Bioinspired one-pot furan-thiol-amine multicomponent reaction for making heterocycles and its applications. Nat Commun 2023; 14:4086. [PMID: 37429878 DOI: 10.1038/s41467-023-39708-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Accepted: 06/20/2023] [Indexed: 07/12/2023] Open
Abstract
One-pot multicomponent coupling of different units in a chemoselective manner and their late-stage diversification has wide applicability in varying chemistry fields. Here, we report a simple multicomponent reaction inspired by enzymes that combines thiol and amine nucleophiles in one pot via a furan-based electrophile to generate stable pyrrole heterocycles independent of the diverse functionalities on furans, thiols and amines under physiological conditions. The resulting pyrrole provides a reactive handle to introduce diverse payloads. We demonstrate the application of Furan-Thiol-Amine (FuTine) reaction for the selective and irreversible labeling of peptides, synthesis of macrocyclic and stapled peptides, selective modification of twelve different proteins with varying payloads, homogeneous engineering of proteins, homogeneous stapling of proteins, dual modification of proteins with different fluorophores using the same chemistry and labeling of lysine and cysteine in a complex human proteome.
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Affiliation(s)
- Yuwen Wang
- Department of Chemistry, Emory University, 30322, Atlanta, GA, USA
| | - Patrick Czabala
- Department of Chemistry, Emory University, 30322, Atlanta, GA, USA
| | - Monika Raj
- Department of Chemistry, Emory University, 30322, Atlanta, GA, USA.
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7
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Zhang Y, Zhang Y. A comprehensive review of furan in foods: From dietary exposures and in vivo metabolism to mitigation measures. Compr Rev Food Sci Food Saf 2023; 22:809-841. [PMID: 36541202 DOI: 10.1111/1541-4337.13092] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Revised: 11/16/2022] [Accepted: 11/22/2022] [Indexed: 12/24/2022]
Abstract
Furan is a thermal food processing contaminant that is ubiquitous in various food products such as coffee, canned and jarred foods, and cereals. A comprehensive summary of research progress on furan is presented in this review, including discussion of (i) formation pathways, (ii) occurrence and dietary exposures, (iii) analytical techniques, (iv) toxicities, (v) metabolism and metabolites, (vi) risk assessment, (vii) potential biomarkers, and (viii) mitigation measures. Dietary exposure to furan varies among different countries and age groups. Furan acts through various toxicological pathways mediated by its primary metabolite, cis-2-butene-1,4-dial (BDA). BDA can readily react with glutathione, amino acids, biogenic amines, or nucleotides to form corresponding metabolites, some of which have been proposed as potential biomarkers of exposure to furan. Present risk assessment of furan mainly employed the margin of exposure approach. Given the widespread occurrence of furan in foods and its harmful health effects, mitigating furan levels in foods or exploring potential dietary supplements to protect against furan toxicity is necessary for the benefit of food safety and public health.
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Affiliation(s)
- Yiju Zhang
- National Engineering Laboratory of Intelligent Food Technology and Equipment, Zhejiang Key Laboratory for Agro-Food Processing, Fuli Institute of Food Science, College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, Zhejiang, China
| | - Yu Zhang
- National Engineering Laboratory of Intelligent Food Technology and Equipment, Zhejiang Key Laboratory for Agro-Food Processing, Fuli Institute of Food Science, College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, Zhejiang, China
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8
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Muńko M, Ciesielska K, Pluskota-Karwatka D. New insight into the molecular mechanism of protein cross-linking induced by cis-2-butene-1,4-dial, the metabolite of furan: Formation of 2-substituted pyrrole cross-links involving the cysteine and lysine residues. Bioorg Chem 2022; 125:105852. [DOI: 10.1016/j.bioorg.2022.105852] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2021] [Revised: 04/28/2022] [Accepted: 04/30/2022] [Indexed: 11/25/2022]
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9
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Li W, Hu Z, Sun C, Wang Y, Li W, Peng Y, Zheng J. A Metabolic Activation-Based Chemoproteomic Platform to Profile Adducted Proteins Derived from Furan-Containing Compounds. ACS Chem Biol 2022; 17:873-882. [PMID: 35353477 DOI: 10.1021/acschembio.1c00917] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Human exposure to widespread furan-containing compounds (FCCs) has drawn much attention due to the high risk of their toxicities. Identifying adducted proteins resulting from the metabolic activation of FCCs is the core to learning the mechanism of FCCs' toxic action. We succeeded in establishing a metabolic activation-based chemoproteomic platform to map FCC-derived protein adducts in cultured primary hepatocytes treated with FCCs and to pinpoint the modification sites, using click chemistry but without alkynylation or azidation of FCCs to be investigated. The proposed platform was systematically verified by biomimetic synthesis, liver microsomal incubation, and primary hepatocyte culture. A mixture of furan, 2-methylfuran, and 2,5-dimethylfuran as model was tested by use of the established platform. A total of hepatic 171 lysine-based adducted proteins and 145 cysteine-based adducted proteins by the reactive metabolites of the three FCCs were enriched and identified (Byonic score ≥ 100). The target proteins were found to mainly participate in ATP synthesis. The technique was also successfully applied to furan-containing natural products. The established platform made it possible to profile covalently adducted proteins, because of potential exposure to a vast inventory of over two million of FCCs documented.
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Affiliation(s)
- Wei Li
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning 110016, P. R. China
| | - Zixia Hu
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning 110016, P. R. China
| | - Chen Sun
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning 110016, P. R. China
| | - Yuwei Wang
- Department of Pharmacognosy and Utilization Key Laboratory of Northeast Plant Materials, School of Traditional Chinese Medicine, Shenyang Pharmaceutical University, Shenyang 110016, P. R. China
| | - Weiwei Li
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, Guiyang, Guizhou 550025, P. R. China
| | - Ying Peng
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning 110016, P. R. China
| | - Jiang Zheng
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, Liaoning 110016, P. R. China
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, Guiyang, Guizhou 550025, P. R. China
- Key Laboratory of Environmental Pollution, Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guiyang, 550025, P. R. China
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10
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Tian M, Peng Y, Zheng J. Metabolic Activation and Hepatotoxicity of Furan-containing Compounds. Drug Metab Dispos 2022; 50:655-670. [DOI: 10.1124/dmd.121.000458] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Accepted: 01/18/2022] [Indexed: 11/22/2022] Open
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11
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Mirzaei MS, Ivanov MV, Taherpour AA, Mirzaei S. Mechanism-Based Inactivation of Cytochrome P450 Enzymes: Computational Insights. Chem Res Toxicol 2021; 34:959-987. [PMID: 33769041 DOI: 10.1021/acs.chemrestox.0c00483] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Mechanism-based inactivation (MBI) refers to the metabolic bioactivation of a xenobiotic by cytochrome P450s to a highly reactive intermediate which subsequently binds to the enzyme and leads to the quasi-irreversible or irreversible inhibition. Xenobiotics, mainly drugs with specific functional units, are the major sources of MBI. Two possible consequences of MBI by medicinal compounds are drug-drug interaction and severe toxicity that are observed and highlighted by clinical experiments. Today almost all of these latent functional groups (e.g., thiophene, furan, alkylamines, etc.) are known, and their features and mechanisms of action, owing to the vast experimental and theoretical studies, are determined. In the past decade, molecular modeling techniques, mostly density functional theory, have revealed the most feasible mechanism that a drug undergoes by P450 enzymes to generate a highly reactive intermediate. In this review, we provide a comprehensive and detailed picture of computational advances toward the elucidation of the activation mechanisms of various known groups with MBI activity. To this aim, we briefly describe the computational concepts to carry out and analyze the mechanistic investigations, and then, we summarize the studies on compounds with known inhibition activity including thiophene, furan, alkylamines, terminal acetylene, etc. This study can be reference literature for both theoretical and experimental (bio)chemists in several different fields including rational drug design, the process of toxicity prevention, and the discovery of novel inhibitors and catalysts.
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Affiliation(s)
- M Saeed Mirzaei
- Department of Organic Chemistry, Faculty of Chemistry, Razi University, Kermanshah, Iran 67149-67346
| | - Maxim V Ivanov
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States
| | - Avat Arman Taherpour
- Department of Organic Chemistry, Faculty of Chemistry, Razi University, Kermanshah, Iran 67149-67346.,Medical Biology Research Centre, University of Medical Sciences, Kermanshah, Iran 67149-67346
| | - Saber Mirzaei
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
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12
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Kassem NOF, Peterson LA, Liles S, Kassem NO, Zaki FK, Lui KJ, Vevang KR, Dodder NG, Hoh E, Hovell MF. Urinary metabolites of furan in waterpipe tobacco smokers compared to non-smokers in home settings in the US. Toxicol Lett 2020; 333:202-210. [PMID: 32814080 PMCID: PMC10883161 DOI: 10.1016/j.toxlet.2020.08.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Revised: 07/23/2020] [Accepted: 08/03/2020] [Indexed: 11/16/2022]
Abstract
OBJECTIVES Determine uptake of furan, a potential human carcinogen, in waterpipe tobacco (WPT) smokers in home settings. METHODS We analysed data from a US convenience sample of 50 exclusive WPT smokers, mean age 25.3 years, and 25 non-smokers, mean age 25.5 years. For WPT smokers, data were collected at a home visit by research assistants during which participants smoked one WPT head of one brand for a mean of 33.1 min in their homes. Research assistants provided and prepared a WP for participants by weighing and loading 10 g of WPT in the WP head. At the completion of the smoking session, research assistants measured the remaining WPT. Cotinine and six furan metabolites were quantified in first morning urine samples provided on 2 consecutive days for non-smokers, and on the morning of a WPT smoking session and on the following morning for smokers. RESULTS WPT smokers consumed a mean of 2.99 g WPT. In WPT smokers, urinary cotinine levels increased significantly 26.1 times the following morning; however, urinary metabolites of furan did not increase significantly. Compared to non-smokers, 2 furan metabolites, N-acetyl-S-[1-(5-acetylamino-5-carboxylpentyl)-1H-pyrrol-3-yl]-L-cysteine and N-acetyl-S-[1-(5-amino-5-carboxypentyl)-1H-pyrrol-3-yl]-L-cysteine sulfoxide, were significantly higher in WPT smokers in pre and in post WPT smoking levels. CONCLUSIONS To enable a more rigorous assessment of furan exposure from WPT smoking, future research should determine furan concentrations in WPT smoke, quantify furan metabolites from users of various WPT brands; and extend the investigation to social settings where WPT smoking is habitually practiced.
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Affiliation(s)
- Nada O F Kassem
- Center for Behavioral Epidemiology and Community Health (CBEACH), Hookah Tobacco Studies Division, San Diego State University Research Foundation, San Diego, CA, 92123, United States.
| | - Lisa A Peterson
- Division of Environmental Health Sciences and the Masonic Cancer Center, University of Minnesota, Minneapolis, MN, 55455, United States
| | - Sandy Liles
- Center for Behavioral Epidemiology and Community Health (CBEACH), Hookah Tobacco Studies Division, San Diego State University Research Foundation, San Diego, CA, 92123, United States
| | - Noura O Kassem
- Center for Behavioral Epidemiology and Community Health (CBEACH), Hookah Tobacco Studies Division, San Diego State University Research Foundation, San Diego, CA, 92123, United States
| | - Flora K Zaki
- Center for Behavioral Epidemiology and Community Health (CBEACH), Hookah Tobacco Studies Division, San Diego State University Research Foundation, San Diego, CA, 92123, United States
| | - Kung-Jong Lui
- San Diego State University Research Foundation, 5250 Campanile Dr., San Diego, CA 92182, United States
| | - Karin R Vevang
- Division of Environmental Health Sciences and the Masonic Cancer Center, University of Minnesota, Minneapolis, MN, 55455, United States
| | - Nathan G Dodder
- San Diego State University Research Foundation, 5250 Campanile Dr., San Diego, CA 92182, United States
| | - Eunha Hoh
- School of Public Health, San Diego State University, 5500 Campanile Dr., San Diego, CA 92182, United States
| | - Melbourne F Hovell
- Center for Behavioral Epidemiology and Community Health (CBEACH), Hookah Tobacco Studies Division, San Diego State University Research Foundation, San Diego, CA, 92123, United States
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13
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Kettlitz B, Scholz G, Theurillat V, Cselovszky J, Buck NR, O’ Hagan S, Mavromichali E, Ahrens K, Kraehenbuehl K, Scozzi G, Weck M, Vinci C, Sobieraj M, Stadler RH. Furan and Methylfurans in Foods: An Update on Occurrence, Mitigation, and Risk Assessment. Compr Rev Food Sci Food Saf 2019; 18:738-752. [DOI: 10.1111/1541-4337.12433] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2018] [Revised: 01/13/2019] [Accepted: 01/15/2019] [Indexed: 12/16/2022]
Affiliation(s)
- Beate Kettlitz
- FoodDrinkEurope (FDE) Ave. des Nerviens 9–31 1040 Brussels Belgium
| | - Gabriele Scholz
- Nestlé ResearchVers‐chez‐les‐Blanc 1000 Lausanne 26 Switzerland
| | - Viviane Theurillat
- Nestlé Research & Development Rte de Chavornay 3 CH‐1350 Orbe Switzerland
| | - Jörg Cselovszky
- Cereal Partners Worldwide S.A. Rte de Chavornay 7 CH‐1350 Orbe Switzerland
| | - Neil R. Buck
- General Mills Inc. Ave. Reverdil 12–14 CH‐1260 Nyon Switzerland
| | - Sue O’ Hagan
- Pepsico Beaumont Park, 4 Leycroft Rd., Leiecster LE4 1ET United Kingdom
| | - Eva Mavromichali
- Specialised Nutrition Europe (SNE) Ave. des Nerviens 9–31 1040 Brussels Belgium
| | - Katja Ahrens
- German Federation for Food Law and Food Science Claire‐Waldoff‐Str. 7 10117 Berlin Germany
| | - Karin Kraehenbuehl
- Société des Produits Nestlé S.A. Entre‐deux‐Villes 10–12 1814 La Tour‐de‐Peilz Switzerland
| | - Gabriella Scozzi
- European Breakfast Cereal Assn. Ave. des Nerviens 9–31 B‐1040 Brussels Belgium
| | - Markus Weck
- CULINARIA Europe Reuterstraße 151 D‐53113 Bonn Germany
| | - Claudia Vinci
- European Assn. of Fruit and Vegetable Processors (Profel) Av. De Tervueren 188A B‐1150 Brussels Belgium
| | - Marta Sobieraj
- European Fruit Juice Assn. (AIJN) Rue de la Loi 221 box 5 B‐1040 Brussels Belgium
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14
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Knutsen HK, Alexander J, Barregård L, Bignami M, Brüschweiler B, Ceccatelli S, Cottrill B, Dinovi M, Edler L, Grasl-Kraupp B, Hogstrand C, Hoogenboom LR, Nebbia CS, Oswald IP, Petersen A, Rose M, Roudot AC, Schwerdtle T, Vleminckx C, Vollmer G, Chipman K, De Meulenaer B, Dinovi M, Mennes W, Schlatter J, Schrenk D, Baert K, Dujardin B, Wallace H. Risks for public health related to the presence of furan and methylfurans in food. EFSA J 2017; 15:e05005. [PMID: 32625300 PMCID: PMC7009982 DOI: 10.2903/j.efsa.2017.5005] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
The European Commission asked EFSA for a scientific evaluation on the risk to human health of the presence of furan and methylfurans (2-methylfuran, 3-methylfuran and 2,5-dimethylfuran) in food. They are formed in foods during thermal processing and can co-occur. Furans are produced from several precursors such as ascorbic acid, amino acids, carbohydrates, unsaturated fatty acids and carotenoids, and are found in a variety of foods including coffee and canned and jarred foods. Regarding furan occurrence, 17,056 analytical results were used in the evaluation. No occurrence data were received on methylfurans. The highest exposures to furan were estimated for infants, mainly from ready-to-eat meals. Grains and grain-based products contribute most for toddlers, other children and adolescents. In adults, elderly and very elderly, coffee is the main contributor to dietary exposure. Furan is absorbed from the gastrointestinal tract and is found in highest amounts in the liver. It has a short half-life and is metabolised by cytochrome P450 2E1 (CYP2E1) to the reactive metabolite, cis-but-2-ene-1,4-dialdehyde (BDA). BDA can bind covalently to amino acids, proteins and DNA. Furan is hepatotoxic in rats and mice with cholangiofibrosis in rats and hepatocellular adenomas/carcinomas in mice being the most prominent effects. There is limited evidence of chromosomal damage in vivo and a lack of understanding of the underlying mechanism. Clear evidence for indirect mechanisms involved in carcinogenesis include oxidative stress, gene expression alterations, epigenetic changes, inflammation and increased cell proliferation. The CONTAM Panel used a margin of exposure (MOE) approach for the risk characterisation using as a reference point a benchmark dose lower confidence limit for a benchmark response of 10% of 0.064 mg/kg body weight (bw) per day for the incidence of cholangiofibrosis in the rat. The calculated MOEs indicate a health concern. This conclusion was supported by the calculated MOEs for the neoplastic effects.
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15
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Zeng Z, Ma J, Liu B, Jiang H. Amino acid-catalyzed formation of 2-vinylfuran from lipid-derived 4-oxo-2-hexenal. Food Chem 2015; 188:591-5. [DOI: 10.1016/j.foodchem.2015.05.058] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2015] [Revised: 04/13/2015] [Accepted: 05/13/2015] [Indexed: 10/23/2022]
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16
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Grill AE, Schmitt T, Gates LA, Lu D, Bandyopadhyay D, Yuan JM, Murphy SE, Peterson LA. Abundant Rodent Furan-Derived Urinary Metabolites Are Associated with Tobacco Smoke Exposure in Humans. Chem Res Toxicol 2015; 28:1508-16. [PMID: 26114498 PMCID: PMC5473163 DOI: 10.1021/acs.chemrestox.5b00189] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Furan, a possible human carcinogen, is found in heat treated foods and tobacco smoke. Previous studies have shown that humans are capable of converting furan to its reactive metabolite, cis-2-butene-1,4-dial (BDA), and therefore may be susceptible to furan toxicity. Human risk assessment of furan exposure has been stymied because of the lack of mechanism-based exposure biomarkers. Therefore, a sensitive LC-MS/MS assay for six furan metabolites was applied to measure their levels in urine from furan-exposed rodents as well as in human urine from smokers and nonsmokers. The metabolites that result from direct reaction of BDA with lysine (BDA-N(α)-acetyllysine) and from cysteine-BDA-lysine cross-links (N-acetylcysteine-BDA-lysine, N-acetylcysteine-BDA-N(α)-acetyllysine, and their sulfoxides) were targeted in this study. Five of the six metabolites were identified in urine from rodents treated with furan by gavage. BDA-N(α)-acetyllysine, N-acetylcysteine-BDA-lysine, and its sulfoxide were detected in most human urine samples from three different groups. The levels of N-acetylcysteine-BDA-lysine sulfoxide were more than 10 times higher than that of the corresponding sulfide in many samples. The amount of this metabolite was higher in smokers relative to that in nonsmokers and was significantly reduced following smoking cessation. Our results indicate a strong relationship between BDA-derived metabolites and smoking. Future studies will determine if levels of these biomarkers are associated with adverse health effects in humans.
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Affiliation(s)
| | | | | | | | | | - Jian-Min Yuan
- ∥University of Pittsburgh Cancer Institute, Pittsburgh, Pennsylvania 15232, United States
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17
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Gill S, Kavanagh M, Cherry W, Barker M, Weld M, Cooke GM. A 28-day Gavage Toxicity Study in Fischer 344 Rats with 3-methylfuran. Toxicol Pathol 2015; 43:221-232. [DOI: 10.1177/0192623314534537] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/30/2023]
Abstract
3-Methylfuran is produced in foods during food processing and preservation techniques that involve heat treatment such as cooking, jarring, canning, and pasteurization. Currently, there are no studies available on the toxicity of 3-methylfuran. We conducted a 28-day gavage toxicity study (7 days per week) using doses of 0.0, 0.1, 0.3, 1.5, 3.0, 6.0, 12.0, and 25.0 mg/kg bw/day in order to determine the dose range needed to establish a no observed adverse effect level and to better characterize nonneoplastic effects including those affecting hematology, clinical biochemistry, gross morphology, and histopathology. Histological changes of the liver were noted in all treated animals and gross changes were noted beginning at 3.0 mg/kg bw/kg. Alterations in the activity of serum enzymes indicative of effects on the liver were observed, including increases in levels of alanine transaminase and alkaline phosphatase at the highest dose. There was a significant increase in serum thyroxine (T4) and triiodothyronine (T3), which was not accompanied by histological changes in the thyroid. For the most part, statistically significant changes were seen only at the highest dose for hematology and at the 2 highest doses for clinical chemistry parameters. In contrast, mild histological lesions in the liver were observed even at the lowest dose of 0.1 mg/kg bw/day.
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Affiliation(s)
- Santokh Gill
- Toxicology Research Division, Health Products and Food Branch, Ottawa, Ontario, Canada
| | - Meghan Kavanagh
- Toxicology Research Division, Health Products and Food Branch, Ottawa, Ontario, Canada
| | - Wendy Cherry
- Toxicology Research Division, Health Products and Food Branch, Ottawa, Ontario, Canada
| | - Michael Barker
- Toxicology Research Division, Health Products and Food Branch, Ottawa, Ontario, Canada
| | - Madeline Weld
- Chemical Health Hazard Assessment Division, Bureau of Chemical Safety, Health Canada, Ottawa, Canada
| | - Gerard M. Cooke
- Toxicology Research Division, Health Products and Food Branch, Ottawa, Ontario, Canada
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18
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Lin D, Li C, Peng Y, Gao H, Zheng J. Cytochrome P450–Mediated Metabolic Activation of Diosbulbin B. Drug Metab Dispos 2014; 42:1727-36. [DOI: 10.1124/dmd.114.059261] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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19
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Gates LA, Phillips MB, Matter BA, Peterson LA. Comparative metabolism of furan in rodent and human cryopreserved hepatocytes. Drug Metab Dispos 2014; 42:1132-6. [PMID: 24751574 PMCID: PMC4053996 DOI: 10.1124/dmd.114.057794] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Accepted: 04/21/2014] [Indexed: 11/22/2022] Open
Abstract
Furan is a liver toxicant and carcinogen in rodents. Although humans are most likely exposed to furan through a variety of sources, the effect of furan exposure on human health is still unknown. In rodents, furan requires metabolism to exert its toxic effects. The initial product of the cytochrome P450 2E1-catalyzed oxidation is a reactive α,β-unsaturated dialdehyde, cis-2-butene-1,4-dial (BDA). BDA is toxic and mutagenic and consequently is considered responsible for the toxic effects of furan. The urinary metabolites of furan in rats are derived from the reaction of BDA with cellular nucleophiles, and precursors to these metabolites are detected in furan-exposed hepatocytes. Many of these precursors are 2-(S-glutathionyl)butanedial-amine cross-links in which the amines are amino acids and polyamines. Because these metabolites are derived from the reaction of BDA with cellular nucleophiles, their levels are a measure of the internal dose of this reactive metabolite. To compare the ability of human hepatocytes to convert furan to the same metabolites as rodent hepatocytes, furan was incubated with cryopreserved human and rodent hepatocytes. A semiquantitative liquid chromatography with tandem mass spectrometry assay was developed for a number of the previously characterized furan metabolites. Qualitative and semiquantitative analysis of the metabolites demonstrated that furan is metabolized in a similar manner in all three species. These results indicate that humans may be susceptible to the toxic effects of furan.
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Affiliation(s)
- Leah A Gates
- Division of Environmental Health Sciences (L.A.G., L.A.P.), Masonic Cancer Center (L.A.G., M.B.P., B.A.M., L.A.P.), and Department of Medicinal Chemistry (M.B.P., L.A.P.), University of Minnesota, Minneapolis, Minnesota
| | - Martin B Phillips
- Division of Environmental Health Sciences (L.A.G., L.A.P.), Masonic Cancer Center (L.A.G., M.B.P., B.A.M., L.A.P.), and Department of Medicinal Chemistry (M.B.P., L.A.P.), University of Minnesota, Minneapolis, Minnesota
| | - Brock A Matter
- Division of Environmental Health Sciences (L.A.G., L.A.P.), Masonic Cancer Center (L.A.G., M.B.P., B.A.M., L.A.P.), and Department of Medicinal Chemistry (M.B.P., L.A.P.), University of Minnesota, Minneapolis, Minnesota
| | - Lisa A Peterson
- Division of Environmental Health Sciences (L.A.G., L.A.P.), Masonic Cancer Center (L.A.G., M.B.P., B.A.M., L.A.P.), and Department of Medicinal Chemistry (M.B.P., L.A.P.), University of Minnesota, Minneapolis, Minnesota
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20
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Sviatenko LK, Gorb L, Hovorun D, Leszczynski J. In silico kinetics and mechanism of interaction of cis-2-butene-1,4-dial with 2'-deoxycytidine. Chem Res Toxicol 2014; 27:981-9. [PMID: 24841187 DOI: 10.1021/tx5000427] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Newly proposed approach involving computational analysis of multistep chemical reactions has been successfully applied to study the interaction between 2'-deoxycytidine and cis-2-butene-1,4-dial, a metabolite of furan. The new method comprises a combination of few steps. They include the prediction of the reaction mechanism, calculation of Gibbs free energies for the reaction pathway, and conversion of barrier energies to rate constants. On the basis of the results of previous steps, corresponding kinetic equations are constructed and solved. Such a procedure allows one to indicate the definite concentration of reaction species (reactants, intermediates, and products) at any moment in time. Obtained results show that 2'-deoxycytidine reacts with cis-2-butene-1,4-dial to form primary products, which are represented by four polycyclic diastereomers. These primary products further transform to more stable secondary product by dehydration, which is catalyzed by acid. The obtained data demonstrate that cis-2-butene-1,4-dial plays a key role in furan-induced carcinogenesis.
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Affiliation(s)
- Liudmyla K Sviatenko
- Interdisciplinary Center for Nanotoxicity, Department of Chemistry and Biochemistry, Jackson State University , 1325 J.R. Lynch Street, P.O. Box 17910, Jackson, Mississippi 39217-0510, United States
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21
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Phillips MB, Sullivan MM, Villalta PW, Peterson LA. Covalent modification of cytochrome c by reactive metabolites of furan. Chem Res Toxicol 2014; 27:129-35. [PMID: 24364757 PMCID: PMC3908668 DOI: 10.1021/tx400368r] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Metabolism of the hepatotoxicant furan leads to protein adduct formation in the target organ. The initial bioactivation step involves cytochrome P450-catalyzed oxidation of furan, generating cis-2-butene-1,4-dial (BDA). BDA reacts with lysine to form pyrrolin-2-one adducts. Metabolic studies indicate that BDA also reacts with glutathione (GSH) to generate 2-(S-glutathionyl)butanedial (GSH-BDA), which then reacts with lysine to form GSH-BDA-lysine cross-links. To explore the relative reactivity of these two reactive intermediates, cytochrome c was reacted with BDA in the presence and absence of GSH. As judged by MALDI-TOF mass spectrometry, BDA reacts extensively with cytochrome c to form adducts that add 66 Da to the protein, consistent with the formation of pyrrolinone adducts. Addition of GSH to the reaction mixture reduced the overall extent of adduct formation. The mass of the adducted protein was shifted by 355 Da as expected for GSH-BDA-protein cross-link formation. LC-MS/MS analysis of the tryptic digests of the alkylated protein indicated that the majority of adducts occurred on lysine residues, with BDA reacting less selectively than GSH-BDA. Both types of adducts may contribute to the toxic effects of furan.
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Affiliation(s)
| | | | | | - Lisa A. Peterson
- To whom correspondence should be addressed: Lisa Peterson, University of Minnesota, Cancer and Cardiology Building, Room 2-126, 2231 6th Street, Minneapolis, MN, 55455. Phone: 612-626-0164; fax: 612-626-5135;
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22
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Taxak N, Kalra S, Bharatam PV. Mechanism-Based Inactivation of Cytochromes by Furan Epoxide: Unraveling the Molecular Mechanism. Inorg Chem 2013; 52:13496-508. [DOI: 10.1021/ic401907k] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Nikhil Taxak
- Department
of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S. Nagar
(Mohali), 160 062 Punjab, India
| | - Sourav Kalra
- Department
of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S. Nagar
(Mohali), 160 062 Punjab, India
| | - Prasad V. Bharatam
- Department
of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S. Nagar
(Mohali), 160 062 Punjab, India
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23
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Abstract
Many xenobiotics containing a furan ring are toxic and/or carcinogenic. The harmful effects of these compounds require furan ring oxidation. This reaction generates an electrophilic intermediate. Depending on the furan ring substituents, the intermediate is either an epoxide or a cis-enedione with more ring substitution favoring epoxide formation. Either intermediate reacts with cellular nucleophiles such as protein or DNA to trigger toxicities. The reactivity of the metabolite determines which cellular nucleophiles are targeted. The toxicity of a particular furan is also influenced by the presence of competing metabolic pathways or efficient detoxification routes. GSH plays an important role in modulating the harmful effects of this class of compound by reacting with the reactive metabolite. However, this may not represent a detoxification step in all cases.
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Affiliation(s)
- Lisa A Peterson
- Division of Environmental Health Sciences, and Masonic Cancer Center, University of Minnesota , Minneapolis, Minnesota 55455, United States
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24
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Holland RJ, Maciag AE, Kumar V, Shi L, Saavedra JE, Prud'homme RK, Chakrapani H, Keefer LK. Cross-linking protein glutathionylation mediated by O2-arylated bis-diazeniumdiolate "Double JS-K". Chem Res Toxicol 2012; 25:2670-7. [PMID: 23106594 PMCID: PMC3524378 DOI: 10.1021/tx3003142] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Attachment of glutathione (GSH) to cysteine residues in proteins (S-glutathionylation) is a reversible post-translational modification that can profoundly alter protein structure and function. Often serving in a protective role, for example, by temporarily saving protein thiols from irreversible oxidation and inactivation, glutathionylation can be identified and semiquantitatively assessed using anti-GSH antibodies, thought to be specific for recognition of the S-glutathionylation modification. Here, we describe an alternate mechanism of protein glutathionylation in which the sulfur atoms of the GSH and the protein's thiol group are covalently bound via a cross-linking agent, rather than through a disulfide bond. This form of thiol cross-linking has been shown to occur and has been confirmed by mass spectrometry at the solution chemistry level, as well as in experiments documenting the potent antiproliferative activity of the bis-diazeniumdiolate Double JS-K in H1703 cells in vitro and in vivo. The modification is recognized by the anti-GSH antibody as if it were authentic S-glutathionylation, requiring mass spectrometry to distinguish between them.
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Affiliation(s)
- Ryan J Holland
- Frederick National Laboratory for Cancer Research, Frederick, Maryland 21702, United States.
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25
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Gates LA, Lu D, Peterson LA. Trapping of cis-2-butene-1,4-dial to measure furan metabolism in human liver microsomes by cytochrome P450 enzymes. Drug Metab Dispos 2012; 40:596-601. [PMID: 22187484 PMCID: PMC3286269 DOI: 10.1124/dmd.111.043679] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2011] [Accepted: 12/20/2011] [Indexed: 11/22/2022] Open
Abstract
Furan is a liver toxicant and carcinogen in rodents. It is classified as a possible human carcinogen, but the human health effects of furan exposure remain unknown. The oxidation of furan by cytochrome P450 (P450) enzymes is necessary for furan toxicity. The product of this reaction is the reactive α,β-unsaturated dialdehyde, cis-2-butene-1,4-dial (BDA). To determine whether human liver microsomes metabolize furan to BDA, a liquid chromatography/tandem mass spectrometry method was developed to detect and quantify BDA by trapping this reactive metabolite with N-acetyl-l-cysteine (NAC) and N-acetyl-l-lysine (NAL). Reaction of NAC and NAL with BDA generates N-acetyl-S-[1-(5-acetylamino-5-carboxypentyl)-1H-pyrrol-3-yl]-l-cysteine (NAC-BDA-NAL). Formation of NAC-BDA-NAL was quantified in 21 different human liver microsomal preparations. The levels of metabolism were comparable to that observed in F-344 rat and B6C3F1 mouse liver microsomes, two species known to be sensitive to furan-induced toxicity. Studies with recombinant human liver P450s indicated that CYP2E1 is the most active human liver furan oxidase. The activity of CYP2E1 as measured by p-nitrophenol hydroxylase activity was correlated to the extent of NAC-BDA-NAL formation in human liver microsomes. The formation of NAC-BDA-NAL was blocked by CYP2E1 inhibitors but not other P450 inhibitors. These results suggest that humans are capable of oxidizing furan to its toxic metabolite, BDA, at rates comparable to those of species sensitive to furan exposure. Therefore, humans may be susceptible to furan's toxic effects.
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Affiliation(s)
- Leah A Gates
- Division of Environmental Health Sciences and Masonic Cancer Center, University of Minnesota, Minneapolis, Minnesota 55455, USA
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