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Xing S, Shi L, Liu G, Zhu M, Xu Y, Liu D, He X, Wang Z. S-Adenosyl-l-Methionine Promotes Metabolism of Fungicides in Cabernet Sauvignon ( Vitis vinifera L.) Berries. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:12413-12420. [PMID: 33104344 DOI: 10.1021/acs.jafc.0c04016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Fungicides are commonly used to prevent and treat grape (Vitis vinifera L.) diseases; however, they are potentially toxic to humans. Herein, we show that the application of S-adenosyl-l-methionine (SAM) accelerated the metabolism of various fungicides in Cabernet Sauvignon berries. The substances and enzymes involved in the metabolism of fungicides were analyzed to elucidate the effects of SAM. Results showed that SAM improved the production rate of superoxide anion, the hydrogen peroxide content, and the activities of superoxide dismutase, catalase, and peroxidase in azoxystrobin-treated berries. Additionally, SAM had a positive effect on the content of reduced glutathione and on the activities of glutathione S-transferase, glutathione reductase, and glutathione peroxidase. Importantly, the stimulatory effect of SAM on fungicide metabolism was also observed for metalaxyl and thiophanate-methyl. These results suggest that SAM can be used to improve food safety.
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Affiliation(s)
- Shijun Xing
- College of Food Science and Pharmacy, Xinjiang Agricultural University, Urumqi 830052, P. R. China
| | - Ling Shi
- College of Food Science and Pharmacy, Xinjiang Agricultural University, Urumqi 830052, P. R. China
| | - Guangjuan Liu
- College of Food Science and Pharmacy, Xinjiang Agricultural University, Urumqi 830052, P. R. China
| | - Mingrui Zhu
- College of Food Science and Pharmacy, Xinjiang Agricultural University, Urumqi 830052, P. R. China
| | - Yanli Xu
- College of Food Science and Pharmacy, Xinjiang Agricultural University, Urumqi 830052, P. R. China
| | - Dan Liu
- College of Food Science and Pharmacy, Xinjiang Agricultural University, Urumqi 830052, P. R. China
| | - Xin He
- College of Food Science and Pharmacy, Xinjiang Agricultural University, Urumqi 830052, P. R. China
| | - Zirong Wang
- College of Food Science and Pharmacy, Xinjiang Agricultural University, Urumqi 830052, P. R. China
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Ketelslegers HB, Gottschalk RWH, Godschalk RWL, Knaapen AM, van Schooten FJ, Vlietinck RFMH, Kleinjans JCS, van Delft JHM. Interindividual Variations in DNA Adduct Levels Assessed by Analysis of Multiple Genetic Polymorphisms in Smokers. Cancer Epidemiol Biomarkers Prev 2006; 15:624-9. [PMID: 16614101 DOI: 10.1158/1055-9965.epi-05-0431] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Genetic polymorphisms in genes involved in processes that affect DNA damage may explain part of the large interindividual variation in DNA adduct levels in smokers. We investigated the effect of 19 polymorphisms in 12 genes involved in carcinogen metabolism, DNA repair, and oxidant metabolism on DNA adduct levels (determined by (32)P post-labeling) in lymphocytes of 63 healthy Caucasian smokers. The total number of alleles that were categorized as putatively high-risk alleles seemed associated with bulky DNA adduct levels (P = 0.001). Subsequently, to investigate which polymorphisms may have the highest contribution to DNA adduct levels in these smokers, discriminant analysis was done. In the investigated set of polymorphisms, GSTM1*0 (P < 0.001), mEH*2 (P = 0.001), and GPX1*1 (P < 0.001) in combination with the level of exposure (P < 0.001) were found to be key effectors. DNA adduct levels in subjects with a relatively high number of risk alleles of these three genes were >2-fold higher than in individuals not having these risk alleles. Noteworthy, all three genes are involved in deactivation of reactive carcinogenic metabolites. This study shows that analysis of multiple genetic polymorphisms may predict the interindividual variation in DNA adduct levels upon exposure to cigarette smoke. It is concluded that discriminant analysis presents an important statistical tool for analyzing the effect of multiple genotypes on molecular biomarkers.
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Affiliation(s)
- Hans B Ketelslegers
- Department of Health Risk Analysis and Toxicology, Maastricht University, the Netherlands
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Kulkarni AP, Sajan M. Lipoxygenase-another pathway for glutathione conjugation of xenobiotics: A study with human term placental lipoxygenase and ethacrynic acid. Arch Biochem Biophys 1999; 371:220-7. [PMID: 10545208 DOI: 10.1006/abbi.1999.1439] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In this study, we examined the ability of human term placental lipoxygenase (HTPLO) to catalyze glutathione (GSH) conjugate formation from ethacrynic acid (EA) in the presence of linoleic acid (LA) and GSH. HTPLO purified by affinity chromatography was used in all the experiments. The results indicate that the process of EA-SG is enzymatic in nature. The reaction shows dependence on pH, the enzyme, and the concentration of GSH, LA, and EA. The optimal assay conditions to observe a maximal rate of EA-SG formation required the presence of 0.3 mM LA, 0.2 mM EA, 2.0 mM GSH, and approximately 300 microg HTPLO in the reaction medium buffered at pH 9.0. Under the experimental conditions employed, the reaction exhibited K(m) values of 1.1 mM, 200 microM, and 130 microM for GSH, LA, and EA, respectively. The estimated specific activity of HTPLO-catalyzed EA-GS formation was approximately 4.4 +/- 0.4 micromol/min/mg protein. This rate is more than twofold greater than the rate noted for the reaction mediated by the purified human term placental glutathione transferase. Under physiologically relevant conditions (20 microM LA, 2.0 mM GSH, at pH 7.4), HTPLO produced EA-SG at 56% of the maximal rate noted under optimal assay conditions. Nordihydroguaiaretic acid, the classical inhibitor of different lipoxygenases, significantly blocked the reaction. It is proposed that free radicals are involved in the process of EA-SG formation by HTPLO. The evidence gathered in this in vitro study suggests for the first time that lipoxygenase present in the human term placenta is capable of EA-SG formation.
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Affiliation(s)
- A P Kulkarni
- Department of Environmental and Occupational Health, University of South Florida, Tampa, Florida 33612-3805, USA.
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Kulkarni AP, Sajan MP. A novel mechanism of glutathione conjugate formation by lipoxygenase: a study with ethacrynic acid. Toxicol Appl Pharmacol 1997; 143:179-88. [PMID: 9073606 DOI: 10.1006/taap.1996.8062] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Ethacrynic acid (EA), a diuretic drug, is known to interact with glutathione transferases in the presence of reduced glutathione (GSH) to yield an EA-SG conjugate. Here we present evidence for a new mechanism for the formation of EA-SG conjugate by a soybean lipoxygenase (SLO)-mediated reaction involving oxidation of GSH to a GS.. Similar to the glutathione transferase-mediated reaction, EA-SG conjugate generated by SLO exhibited an absorbance maximum at 270 nm. The conjugate formation was dependent on the concentration of linoleic acid, EA, GSH, and SLO. The optimal assay conditions to observe a maximal rate of EA-SG formation required the presence of 0.4 mM linoleic acid, 1 mM GSH, 50 nM SLO, and 0.2 mM EA at pH 9.0. Classical inhibitors of lipoxygenase, e.g., nordihydroguaiaretic acid, gossypol, and 5,8,11-eicosatriynoic acid, significantly inhibited EA-SG conjugation. The SLO-generated EA-SG was isolated as a single peak by HPLC. Quantitation of EA-SG by HPLC-coupled radiometry using [3H]GSH yielded a rate of 16.5 mumol/min/mg SLO protein. This rate is up to 1650-fold greater than that reported for different purified isozymes of mammalian glutathione transferase. The structure of EA-SG isolated from HPLC column was confirmed by matrix-assisted laser desorption mass spectroscopy. These results suggest that lipoxygenase, which is primarily known for xenobiotic oxidation, may represent yet another important pathway for GSH conjugate formation that could lead to detoxification of certain chemicals.
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Affiliation(s)
- A P Kulkarni
- Florida Toxicology Research Center, Department of Environmental and Occupational Health, College of Public Health, University of South Florida, Tampa 33612-3805, USA
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Kurella EG, Osipov AN, Goldman R, Boldyrev AA, Kagan VE. Inhibition of Na+/K(+)-ATPase by phenoxyl radicals of etoposide (VP-16): role of sulfhydryls oxidation. BIOCHIMICA ET BIOPHYSICA ACTA 1995; 1232:52-8. [PMID: 7495837 DOI: 10.1016/0005-2728(95)00115-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
In the present work, we studied the effects of phenoxyl radicals, generated by tyrosinase-catalyzed oxidation of a phenolic antitumor drug, Etoposide (VP-16), on a purified dog kidney Na+/K(+)-ATPase by characterizing interactions of VP-16 phenoxyl radicals with the enzyme's SH-groups by ESR and correlating the loss of the enzymatic activity with the oxidation of its SH-groups, and oxidation of VP-16. VP-16/tyrosinase caused inhibition of Na+/K(+)-ATPase which was dependent on the incubation time and concentration of tyrosinase. The inhibition of Na+/K(+)-ATPase was accompanied by a decrease of DTNB (5,5'-dithiobis-(2-nitrobenzoic acid)-titratable SH-groups. In the presence of Na+/K(+)-ATPase, a typical ESR signal of the VP-16 phenoxyl radical could be observed only following a lag period the duration of which was proportional to the concentration of the Na+/K(+)-ATPase added. Our HPLC measurements demonstrated that Na+/K(+)-ATPase protected VP-16 against tyrosinase-catalyzed oxidation. Combined these results suggest that redox-cycling of VP-16/VP-16 phenoxyl radical by SH-groups of Na+/K(+)-ATPase occurred. Ascorbate which is known to reduce the VP-16 phenoxyl radicals, protected the enzyme against inactivation, prevented oxidation of the enzyme's SH-groups. Reduction of VP-16 phenoxyl radicals by ascorbate was directly observed by the semidehydroascorbyl radical signal in the ESR spectra. VP-16 phenoxyl radical-induced oxidation of sulfhydryls and inhibition of the Na+/K(+)-ATPase may be responsible for at least some of its clinical side effects (e.g., cardiotoxicity) which can be prevented by ascorbate.
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Affiliation(s)
- E G Kurella
- Department of Environmental and Occupational Health, University of Pittsburgh, PA 15238, USA
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D'Aquino M, Bullion C, Chopra M, Devi D, Devi S, Dunster C, James G, Komuro E, Kundu S, Niki E, Raza F, Robertson F, Sharma J, Willson R. [3] Sulfhydryl free radical formation enzymatically by sonolysis, by radiolysis, and thermally: Vitamin A, curcumin, muconic acid, and related conjugated olefins as references. Methods Enzymol 1994. [DOI: 10.1016/s0076-6879(94)33006-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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Munday R. Bioactivation of thiols by one-electron oxidation. ADVANCES IN PHARMACOLOGY (SAN DIEGO, CALIF.) 1994; 27:237-70. [PMID: 8068555 DOI: 10.1016/s1054-3589(08)61035-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- R Munday
- Ruakura Agricultural Research Centre, Hamilton, New Zealand
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Baillie TA. Advances in the application of mass spectrometry to studies of drug metabolism, pharmacokinetics and toxicology. ACTA ACUST UNITED AC 1992. [DOI: 10.1016/0168-1176(92)85066-9] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Abstract
During the metabolism of arachidonic acid by prostaglandin H synthase many chemicals including carcinogens are metabolized. These chemicals are metabolized by either the peroxidase activity of prostaglandin H synthase, the peroxyl radicals generated during arachidonic acid oxygenation, or a combination of these two mechanisms. In many cases, the chemical metabolism results in the formation of reactive metabolites that have mutagenic activity and potential carcinogenic activity. In other cases, the chemicals are detoxified. Chemical metabolism that occurs during arachidonic acid oxygenation may be an important determinate of chemical toxicity in extra-hepatic tissues.
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Affiliation(s)
- T E Eling
- Eicosanoid Biochemistry Section, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC 27709
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Thiol-mediated Oxidation of Nonphenolic Lignin Model Compounds by Manganese Peroxidase of Phanerochaete chrysosporium. J Biol Chem 1989. [DOI: 10.1016/s0021-9258(18)71660-8] [Citation(s) in RCA: 97] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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