101
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Wrobel JK, Power R, Toborek M. Biological activity of selenium: Revisited. IUBMB Life 2015; 68:97-105. [PMID: 26714931 DOI: 10.1002/iub.1466] [Citation(s) in RCA: 144] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2015] [Accepted: 12/05/2015] [Indexed: 12/22/2022]
Abstract
Selenium (Se) is an essential micronutrient that exerts multiple and complex effects on human health. Se is essential for human well-being largely due to its potent antioxidant, anti-inflammatory, and antiviral properties. The physiological functions of Se are carried out by selenoproteins, in which Se is specifically incorporated as the amino acid, selenocysteine. Importantly, both beneficial and toxic effects of Se have been reported suggesting that the mode of action of Se is strictly chemical form and concentration dependent. Additionally, there is a relatively narrow window between Se deficiency and toxicity and growing evidence suggests that Se health effects depend greatly on the baseline level of this micronutrient. Thus, Se supplementation is not an easy task and requires an individualized approach. It is essential that we continue to explore and better characterize Se containing compounds and mechanisms of action, which could be crucial for disease prevention and treatment.
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Affiliation(s)
- Jagoda K Wrobel
- Department of Biochemistry and Molecular Biology, University of Miami Miller School of Medicine, Miami, FL, USA
| | - Ronan Power
- Nutrigenomics Research Center, Alltech, Nicholasville, KY, USA
| | - Michal Toborek
- Department of Biochemistry and Molecular Biology, University of Miami Miller School of Medicine, Miami, FL, USA.,Jerzy Kukuczka Academy of Physical Education, Katowice, Poland
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102
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Jablonska E, Raimondi S, Gromadzinska J, Reszka E, Wieczorek E, Krol MB, Smok-Pieniazek A, Nocun M, Stepnik M, Socha K, Borawska MH, Wasowicz W. DNA damage and oxidative stress response to selenium yeast in the non-smoking individuals: a short-term supplementation trial with respect to GPX1 and SEPP1 polymorphism. Eur J Nutr 2015; 55:2469-2484. [PMID: 26658762 PMCID: PMC5122617 DOI: 10.1007/s00394-015-1118-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Accepted: 11/17/2015] [Indexed: 01/28/2023]
Abstract
Purpose Selenium, both essential and toxic element, is considered to protect against cancer, though human supplementation trials have generated many inconsistent data. Genetic background may partially explain a great variability of the studies related to selenium and human health. The aim of this study was to assess whether functional polymorphisms within two selenoprotein-encoding genes modify the response to selenium at the level of oxidative stress, DNA damage, and mRNA expression, especially in the individuals with a relatively low selenium status. Methods The trial involved 95 non-smoking individuals, stratified according to GPX1 rs1050450 and SEPP1 rs3877899 genotypes, and supplemented with selenium yeast (200 µg) for 6 weeks. Blood was collected at four time points, including 4 weeks of washout. Results After genotype stratification, the effect of GPX1 rs1050450 on lower GPx1 activity responsiveness was confirmed; however, in terms of DNA damage, we failed to indicate that individuals homozygous for variant allele may especially benefit from the increased selenium intake. Surprisingly, considering gene and time interaction, GPX1 polymorphism was observed to modify the level of DNA strand breaks during washout, showing a significant increase in GPX1 wild-type homozygotes. Regardless of the genotype, selenium supplementation was associated with a selectively suppressed selenoprotein mRNA expression and inconsistent changes in oxidative stress response, indicating for overlapped, antioxidant, and prooxidant effects. Intriguingly, DNA damage was not influenced by supplementation, but it was significantly increased during washout. Conclusions These results point to an unclear relationship between selenium, genotype, and DNA damage. Electronic supplementary material The online version of this article (doi:10.1007/s00394-015-1118-4) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- E Jablonska
- Department of Toxicology and Carcinogenesis, Nofer Institute of Occupational Medicine, St. Teresy 8 Street, 91-348, Lodz, Poland.
| | - S Raimondi
- Division of Epidemiology and Biostatistics, European Institute of Oncology, Via Ripamonti 435, Milan, Italy
| | - J Gromadzinska
- Department of Toxicology and Carcinogenesis, Nofer Institute of Occupational Medicine, St. Teresy 8 Street, 91-348, Lodz, Poland
| | - E Reszka
- Department of Toxicology and Carcinogenesis, Nofer Institute of Occupational Medicine, St. Teresy 8 Street, 91-348, Lodz, Poland
| | - E Wieczorek
- Department of Toxicology and Carcinogenesis, Nofer Institute of Occupational Medicine, St. Teresy 8 Street, 91-348, Lodz, Poland
| | - M B Krol
- Department of Toxicology and Carcinogenesis, Nofer Institute of Occupational Medicine, St. Teresy 8 Street, 91-348, Lodz, Poland
| | - A Smok-Pieniazek
- Department of Toxicology and Carcinogenesis, Nofer Institute of Occupational Medicine, St. Teresy 8 Street, 91-348, Lodz, Poland
| | - M Nocun
- Department of Toxicology and Carcinogenesis, Nofer Institute of Occupational Medicine, St. Teresy 8 Street, 91-348, Lodz, Poland
| | - M Stepnik
- Department of Toxicology and Carcinogenesis, Nofer Institute of Occupational Medicine, St. Teresy 8 Street, 91-348, Lodz, Poland
| | - K Socha
- Department of Bromatology, Medical University of Bialystok, Mickiewicza 2D Street, 15-222, Białystok, Poland
| | - M H Borawska
- Department of Bromatology, Medical University of Bialystok, Mickiewicza 2D Street, 15-222, Białystok, Poland
| | - W Wasowicz
- Department of Toxicology and Carcinogenesis, Nofer Institute of Occupational Medicine, St. Teresy 8 Street, 91-348, Lodz, Poland
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103
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Heavy Metals and Human Health: Mechanistic Insight into Toxicity and Counter Defense System of Antioxidants. Int J Mol Sci 2015; 16:29592-630. [PMID: 26690422 PMCID: PMC4691126 DOI: 10.3390/ijms161226183] [Citation(s) in RCA: 552] [Impact Index Per Article: 55.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2015] [Revised: 12/01/2015] [Accepted: 12/03/2015] [Indexed: 02/07/2023] Open
Abstract
Heavy metals, which have widespread environmental distribution and originate from natural and anthropogenic sources, are common environmental pollutants. In recent decades, their contamination has increased dramatically because of continuous discharge in sewage and untreated industrial effluents. Because they are non-degradable, they persist in the environment; accordingly, they have received a great deal of attention owing to their potential health and environmental risks. Although the toxic effects of metals depend on the forms and routes of exposure, interruptions of intracellular homeostasis include damage to lipids, proteins, enzymes and DNA via the production of free radicals. Following exposure to heavy metals, their metabolism and subsequent excretion from the body depends on the presence of antioxidants (glutathione, α-tocopherol, ascorbate, etc.) associated with the quenching of free radicals by suspending the activity of enzymes (catalase, peroxidase, and superoxide dismutase). Therefore, this review was written to provide a deep understanding of the mechanisms involved in eliciting their toxicity in order to highlight the necessity for development of strategies to decrease exposure to these metals, as well as to identify substances that contribute significantly to overcome their hazardous effects within the body of living organisms.
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104
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Zwolak I. Increased Cytotoxicity of Vanadium to CHO-K1 Cells in the Presence of Inorganic Selenium. BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2015; 95. [PMID: 26201834 PMCID: PMC4608973 DOI: 10.1007/s00128-015-1615-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
The effect of selenium applied as sodium selenite (Na2SeO3) on the cytotoxicity of vanadyl sulphate (VOSO4) was examined using CHO-K1 cells. From the resazurin-based assay, it appears that Na2SeO3 at low doses (0.5 and 1 μM) can enhance 100 μM VOSO4-induced cell damage. The two-way ANOVA analysis revealed that the increased cell damage was a consequence of a synergistic interaction of 0.5 μM Na2SeO3 with VOSO4 and 1 μM Na2SeO3 with VOSO4. Observations performed with a phase-contrast microscope showed most cells to be rounded upon treatment with VOSO4 alone. In turn, a majority of cells co-treated with VOSO4 and 1 μM Na2SeO3 were elongated, and exhibited cytoplasmic vacuolization. These results warn of the potential contribution of inorganic selenium to vanadium-induced toxicity.
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Affiliation(s)
- Iwona Zwolak
- Department of Cell Biology, Institute of Environmental Protection, The John Paul II Catholic University of Lublin, Kraśnicka Ave. 102, 20-718, Lublin, Poland.
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105
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Liu K, Zhao Y, Chen F, Fang Y. Purification and identification of Se-containing antioxidative peptides from enzymatic hydrolysates of Se-enriched brown rice protein. Food Chem 2015; 187:424-30. [DOI: 10.1016/j.foodchem.2015.04.086] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2014] [Revised: 02/07/2015] [Accepted: 04/13/2015] [Indexed: 11/16/2022]
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106
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Aroui S, Dardevet L, Ajmia WB, de Boisvilliers M, Perrin F, Laajimi A, Boumendjel A, Kenani A, Muller JM, De Waard M. A Novel Platinum–Maurocalcine Conjugate Induces Apoptosis of Human Glioblastoma Cells by Acting through the ROS-ERK/AKT-p53 Pathway. Mol Pharm 2015; 12:4336-48. [DOI: 10.1021/acs.molpharmaceut.5b00531] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Sonia Aroui
- Laboratoire
de Biochimie, Unité de recherche UR 12ES08 “Signalisation
Cellulaire et Pathologies”, Faculté de Médecine
de Monastir, Université de Monastir, 5019 Monastir, Tunisia
| | - Lucie Dardevet
- LabEx
Ion Channels, Science and Therapeutics, INSERM U836, Grenoble Neuroscience Institute, 38042 Grenoble Cedex 09, France
- University Grenoble Alpes, 38000 Grenoble, France
| | - Wafa Ben Ajmia
- Toxicology-Microbiology
and Environnemental Health Unit (UR11ES70), Faculty of Sciences, University of Sfax, Sfax 3072, Tunisia
| | - Madryssa de Boisvilliers
- Equipe
émergente “Récepteurs, régulations et
cellules tumorales” (2RCT), Université de Poitiers, 1 rue Georges
Bonnet, TSA 51106, 86073 Poitiers Cedex 9, France
| | - Florian Perrin
- Equipe
émergente “Récepteurs, régulations et
cellules tumorales” (2RCT), Université de Poitiers, 1 rue Georges
Bonnet, TSA 51106, 86073 Poitiers Cedex 9, France
| | - Amel Laajimi
- Laboratoire
de Biochimie, Unité de recherche UR 12ES08 “Signalisation
Cellulaire et Pathologies”, Faculté de Médecine
de Monastir, Université de Monastir, 5019 Monastir, Tunisia
| | - Ahcène Boumendjel
- University Grenoble Alpes, 38000 Grenoble, France
- CNRS
5063, Département de Pharmacochimie Moléculaire, Université Joseph Fourier, 38400 Saint-Martin d’Hères, France
| | - Abderraouf Kenani
- Laboratoire
de Biochimie, Unité de recherche UR 12ES08 “Signalisation
Cellulaire et Pathologies”, Faculté de Médecine
de Monastir, Université de Monastir, 5019 Monastir, Tunisia
| | - Jean Marc Muller
- Equipe
émergente “Récepteurs, régulations et
cellules tumorales” (2RCT), Université de Poitiers, 1 rue Georges
Bonnet, TSA 51106, 86073 Poitiers Cedex 9, France
| | - Michel De Waard
- LabEx
Ion Channels, Science and Therapeutics, INSERM U836, Grenoble Neuroscience Institute, 38042 Grenoble Cedex 09, France
- University Grenoble Alpes, 38000 Grenoble, France
- Smartox Biotechnology, 570 Rue
de la Chimie, 38400 Saint-Martin d’Hères, France
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107
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Shi HW, Yu C, Yan J. Potassium bromide or sodium chloride catalyzed acetoxyselenenylation of alkenes with diselenides and mCPBA. CHINESE CHEM LETT 2015. [DOI: 10.1016/j.cclet.2015.05.029] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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108
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Lavu RVS, Van De Wiele T, Pratti VL, Tack F, Du Laing G. Selenium bioaccessibility in stomach, small intestine and colon: Comparison between pure Se compounds, Se-enriched food crops and food supplements. Food Chem 2015; 197:382-7. [PMID: 26616964 DOI: 10.1016/j.foodchem.2015.08.001] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2013] [Revised: 09/30/2014] [Accepted: 08/02/2015] [Indexed: 01/13/2023]
Abstract
Selenium (Se) is an essential nutrient for humans as it plays an important role in glutathione peroxidase (GPx) activity. Moreover, it may reduce cancer risks. The objective of this work was to examine in vitro the bioaccessibility of Se in three different Se-enriched food supplements and two different Se-enriched food crops, with reference to two pure Se standards, and changes in its speciation during intestinal digestion. Selenate was found to be stable throughout the entire digestion, whereas incubation of selenomethionine resulted in the chemical and microbial production of minor metabolites. The bioaccessibility of Se in Se-enriched food supplements and food crops was found to be highest in the small intestine. Compared to SelenoPrecise and Se-ACE tablets, a yoghurt-based supplement exhibited a much lower Se bioaccessibility, possibly due to the presence of nano- or microparticles of elemental Se. Colon microbiota were found to primarily affect Se bioaccessibility in the colon environment, with the presence of inactivated microbiota resulting in a higher bioaccessibility. A higher potential of Se to reach the colon and become accessible in this phase may result in beneficial effects on the colon health.
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Affiliation(s)
- Rama V Srikanth Lavu
- Laboratory of Analytical Chemistry and Applied Ecochemistry, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Gent, Belgium.
| | - Tom Van De Wiele
- Laboratory of Microbial Ecology and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Gent, Belgium
| | - Varalakshmi L Pratti
- Laboratory of Analytical Chemistry and Applied Ecochemistry, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Gent, Belgium; Laboratory of Microbial Ecology and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Gent, Belgium
| | - Filip Tack
- Laboratory of Analytical Chemistry and Applied Ecochemistry, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Gent, Belgium
| | - Gijs Du Laing
- Laboratory of Analytical Chemistry and Applied Ecochemistry, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Gent, Belgium
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109
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Kim CY, Zhu Y, Buhman KK, Kim KH. Dietary selenate attenuates adiposity and improves insulin sensitivity in high-fat diet-induced obese mice. J Funct Foods 2015. [DOI: 10.1016/j.jff.2015.05.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
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110
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Evaluation of sodium selenite effects on the potential probiotic Saccharomyces cerevisiae UFMG A-905: A physiological and proteomic analysis. J Funct Foods 2015. [DOI: 10.1016/j.jff.2015.06.048] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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111
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Kieliszek M, Błażejak S, Gientka I, Bzducha-Wróbel A. Accumulation and metabolism of selenium by yeast cells. Appl Microbiol Biotechnol 2015; 99:5373-5382. [PMID: 26003453 PMCID: PMC4464373 DOI: 10.1007/s00253-015-6650-x] [Citation(s) in RCA: 131] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Revised: 04/23/2015] [Accepted: 04/25/2015] [Indexed: 11/30/2022]
Abstract
This paper examines the process of selenium bioaccumulation and selenium metabolism in yeast cells. Yeast cells can bind elements in ionic from the environment and permanently integrate them into their cellular structure. Up to now, Saccharomyces cerevisiae, Candida utilis, and Yarrowia lipolytica yeasts have been used primarily in biotechnological studies to evaluate binding of minerals. Yeast cells are able to bind selenium in the form of both organic and inorganic compounds. The process of bioaccumulation of selenium by microorganisms occurs through two mechanisms: extracellular binding by ligands of membrane assembly and intracellular accumulation associated with the transport of ions across the cytoplasmic membrane into the cell interior. During intracellular metabolism of selenium, oxidation, reduction, methylation, and selenoprotein synthesis processes are involved, as exemplified by detoxification processes that allow yeasts to survive under culture conditions involving the elevated selenium concentrations which were observed. Selenium yeasts represent probably the best absorbed form of this element. In turn, in terms of wide application, the inclusion of yeast with accumulated selenium may aid in lessening selenium deficiency in a diet.
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Affiliation(s)
- Marek Kieliszek
- Department of Biotechnology, Microbiology and Food Evaluation, Faculty of Food Sciences, Warsaw University of Life Sciences - SGGW, Nowoursynowska 159 C, 02-776, Warsaw, Poland,
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112
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Huo S, Dong J, Shen S, Ren Y, Song C, Xu J, Shi T. L-selenomethionine reduces platinum(IV) anticancer model compounds at strikingly faster rates than L-methionine. Dalton Trans 2015; 43:15328-36. [PMID: 25075569 DOI: 10.1039/c4dt01528b] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
L-Selenomethionine (SeMet), the predominant form of selenium acquired from the diet by humans, has been used as a supplement, and exhibit some important functions like cancer prevention and antioxidative defense. Its interactions with Pt(II) anticancer drugs have been characterized, but its redox reactions with platinum(IV) anticancer prodrugs have not been exploited. In this work, the oxidation of SeMet by Pt(IV) anticancer model compounds trans-[PtX2(CN)4](2-) (X = Cl, Br) was characterized. A stopped-flow spectrometer was used to record the rapid scan spectra and to follow the reaction kinetics over a wide pH range. An overall second-order rate law was derived: -d[Pt(IV)]/dt = k'[Pt(IV)][SeMet], where k' pertains to the observed second-order rate constants. The k'-pH profiles showed that k' increased only about 6 times even though the solution pH was varied from 0.25 to 10.5. The redox stoichiometry was determined as Δ[Pt(IV)]/Δ[SeMet] = 1 : (1.07 ± 0.07), suggesting that SeMet was oxidized to selenomethionine selenoxide. The selenoxide together with its hydrated form was identified explicitly by high resolution mass spectral analysis. A reaction mechanism was proposed which encompassed three parallel rate-determining steps relying on the protolytic species of SeMet. Rate constants of the rate-determining steps were obtained from the simulations of the k'-pH profiles. Activation parameters were determined for the reactions of the zwitterionic form of SeMet with the Pt(IV) complexes. A bridged electron transfer process is delineated in the rate-determining steps and several lines of evidence support the bridged electron transfer mode. Strikingly, reduction of [PtX2(CN)4](2-) by SeMet is 3.7 × 10(3)-5.7 × 10(4) times faster than that by L-methionine. Some potential biological consequences resulting from the strikingly fast reduction are discussed.
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Affiliation(s)
- Shuying Huo
- College of Chemistry and Environmental Science, and the MOE Key Laboratory of Medicinal Chemistry and Molecular Diagnostics, Hebei University, Baoding 071002, Hebei Province, P. R. China.
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113
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Kazi TG, Wadhwa SK, Afridi HI, Talpur FN, Tuzen M, Baig JA. Comparison of essential and toxic elements in esophagus, lung, mouth and urinary bladder male cancer patients with related to controls. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2015; 22:7705-7715. [PMID: 25548013 DOI: 10.1007/s11356-014-3988-z] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2014] [Accepted: 12/12/2014] [Indexed: 06/04/2023]
Abstract
There is a compelling evidence in support of negative associations between essential trace and toxic elements in different types of cancer. The aim of the present study was to investigate the relationship between carcinogenic (As, Cd, Ni) and anti-carcinogenic (Se, Zn) trace elements in scalp hair samples of different male cancerous patients (esophagus, lung, mouth, and urinary bladder). For comparative purposes, the scalp hair samples of healthy males of the same age group (ranged 35-65 years) as controls were analyzed. Both controls and patients have the same socioeconomic status, localities, dietary habits, and smoking locally made cigarette. The scalp hair samples were oxidized by 65% nitric acid: 30% hydrogen peroxide (2:1) ratio in microwave oven followed by atomic absorption spectrometry. The validity and accuracy of the methodology were checked using certified reference material of human hair BCR 397. The mean concentrations of As, Cd, and Ni were found to be significantly higher in scalp hair samples of patients having different cancers as compared to the controls, while reverse results were obtained in the case of Se and Zn levels (p < 0.01). The study revealed that the carcinogenic processes are significantly affecting the trace elements burden and mutual interaction of essential trace and toxic elements in the cancerous patients.
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Affiliation(s)
- Tasneem Gul Kazi
- National Center of Excellence in Analytical Chemistry, University of Sindh, 76080, Jamshoro, Pakistan,
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114
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Herrero E, Wellinger RE. Yeast as a model system to study metabolic impact of selenium compounds. MICROBIAL CELL 2015; 2:139-149. [PMID: 28357286 PMCID: PMC5349236 DOI: 10.15698/mic2015.05.200] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Inorganic Se forms such as selenate or selenite (the two more abundant forms in nature) can be toxic in Saccharomyces cerevisiae cells, which constitute an adequate model to study such toxicity at the molecular level and the functions participating in protection against Se compounds. Those Se forms enter the yeast cell through other oxyanion transporters. Once inside the cell, inorganic Se forms may be converted into selenide through a reductive pathway that in physiological conditions involves reduced glutathione with its consequent oxidation into diglutathione and alteration of the cellular redox buffering capacity. Selenide can subsequently be converted by molecular oxygen into elemental Se, with production of superoxide anions and other reactive oxygen species. Overall, these events result in DNA damage and dose-dependent reversible or irreversible protein oxidation, although additional oxidation of other cellular macromolecules cannot be discarded. Stress-adaptation pathways are essential for efficient Se detoxification, while activation of DNA damage checkpoint and repair pathways protects against Se-mediated genotoxicity. We propose that yeast may be used to improve our knowledge on the impact of Se on metal homeostasis, the identification of Se-targets at the DNA and protein levels, and to gain more insights into the mechanism of Se-mediated apoptosis.
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Affiliation(s)
- Enrique Herrero
- Departament de Ciències Mèdiques Bàsiques, Universitat de Lleida, IRBLleida, Rovira Roure 80, 25198 Lleida, Spain
| | - Ralf E Wellinger
- Centro Andaluz de Biología Molecular y Medicina Regenerativa (CABIMER), Universidad de Sevilla, 41092 Sevilla, Spain
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115
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Nagy G, Benko I, Kiraly G, Voros O, Tanczos B, Sztrik A, Takács T, Pocsi I, Prokisch J, Banfalvi G. Cellular and nephrotoxicity of selenium species. J Trace Elem Med Biol 2015; 30:160-70. [PMID: 25604949 DOI: 10.1016/j.jtemb.2014.12.011] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/16/2014] [Revised: 12/22/2014] [Accepted: 12/28/2014] [Indexed: 10/24/2022]
Abstract
PROJECT Beside its useful functions at very low concentrations, selenium including supplementary Se sources pose a potential toxicological risk. The toxicity of selenium species was tested in HaCaT cell culture and related nephrotoxicity in mice. PROCEDURE The apoptotic shrinkage and necrotic expansion of cells were measured by time-lapse image microscopy. Acute nephrotoxicity was estimated upon administration of various selenium species to mice for two weeks. To confirm or to refute the accumulation of Se in the kidney and its potential chronic effect, Se concentration in kidney tissue and histopathlology were tested. RESULTS The comparison of selenium species showed that organic lactomicroSe did not affect cell growth at 5ppm, but inorganic nanoSe severely hampered it at lower concentration (1ppm). The in vivo Se treatment (0.5, 5, 50ppm, corresponding to 4, 40 and 400μg/kg) was misleading as it did neither affect the outward appearance nor the weight of the kidney. Se accumulation was observed after selenate, selenite, SelPlex, selenite and nanoSe administration, while lactomicroSe caused no traceable accumulation. In vivo, ex vivo and in vitro experiments reflected this order of selenium toxicity: selenate>selenite>SelPlex=nanoSe>lactomicroSe. CONCLUSION Within the tested species lactomicroSe was the only non-nephrotoxic selenium source recommended for nutritional Se supplementation.
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Affiliation(s)
- Gabor Nagy
- Department of Microbial Biotechnology and Cell Biology, University of Debrecen, Debrecen, Hungary
| | - Ilona Benko
- Department of Pharmacology and Pharmacotherapy, University of Debrecen, Hungary
| | - Gabor Kiraly
- Department of Microbial Biotechnology and Cell Biology, University of Debrecen, Debrecen, Hungary
| | - Orsolya Voros
- Department of Microbial Biotechnology and Cell Biology, University of Debrecen, Debrecen, Hungary
| | - Bence Tanczos
- Department of Microbial Biotechnology and Cell Biology, University of Debrecen, Debrecen, Hungary
| | - Attila Sztrik
- Department of Animal Breeding, University of Debrecen, Debrecen, Hungary
| | - Timea Takács
- Department of Animal Breeding, University of Debrecen, Debrecen, Hungary
| | - Istvan Pocsi
- Department of Microbial Biotechnology and Cell Biology, University of Debrecen, Debrecen, Hungary
| | - Jozsef Prokisch
- Department of Animal Breeding, University of Debrecen, Debrecen, Hungary
| | - Gaspar Banfalvi
- Department of Microbial Biotechnology and Cell Biology, University of Debrecen, Debrecen, Hungary.
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116
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Extraction, characterization and antioxidant activities of Se-enriched tea polysaccharides. Int J Biol Macromol 2015; 77:76-84. [PMID: 25783017 DOI: 10.1016/j.ijbiomac.2015.02.052] [Citation(s) in RCA: 94] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2014] [Revised: 01/29/2015] [Accepted: 02/28/2015] [Indexed: 11/22/2022]
Abstract
Se-polysaccharides from Se-enriched tea leaves were purified by DEAE-sepharose fast flow gel column (2.5×60cm) and three polysaccharide fractions (Se-TPS1, Se-TPS2, and Se-TPS3) were isolated and purified with yields of 6.5, 37.14, and 8.57%, respectively. The average sizes of Se-TPS1 and Se-TPS2 were determined by HPGPC system, with molecular weights of 1.1×10(5) and 2.4×10(5)Da, respectively. Se-TPS3 was a polysaccharide polymer with two peaks with molecular weights of 9.2×10(5) and 2.5×10(5)Da. Monosaccharide components analysis by ion chromatography revealed Se-polysaccharides were acidic polysaccharoses and different from each other in monosaccharide kinds and molar ratio. Elements of Se, C, H, N, S, and 14 kinds of mineral elements were analyzed by AFS, EA, and ICP-AES, respectively. Spectral analysis (IR and UV) indicated Se-polysaccharides were typical glycoproteins. Morphological analyses of the samples were determined by SEM and AFM. In addition, the DPPH and superoxide radicals scavenging activities were also discussed to assess antioxidant activities of the samples, and Se-polysaccharides showed higher antioxidant activities compared to the ordinary polysaccharides.
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Lazard M, Dauplais M, Blanquet S, Plateau P. Trans-sulfuration Pathway Seleno-amino Acids Are Mediators of Selenomethionine Toxicity in Saccharomyces cerevisiae. J Biol Chem 2015; 290:10741-50. [PMID: 25745108 DOI: 10.1074/jbc.m115.640375] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2015] [Indexed: 12/29/2022] Open
Abstract
Toxicity of selenomethionine, an organic derivative of selenium widely used as supplement in human diets, was studied in the model organism Saccharomyces cerevisiae. Several DNA repair-deficient strains hypersensitive to selenide displayed wild-type growth rate properties in the presence of selenomethionine indicating that selenide and selenomethionine exert their toxicity via distinct mechanisms. Cytotoxicity of selenomethionine decreased when the extracellular concentration of methionine or S-adenosylmethionine was increased. This protection resulted from competition between the S- and Se-compounds along the downstream metabolic pathways inside the cell. By comparing the sensitivity to selenomethionine of mutants impaired in the sulfur amino acid pathway, we excluded a toxic effect of Se-adenosylmethionine, Se-adenosylhomocysteine, or of any compound in the methionine salvage pathway. Instead, we found that selenomethionine toxicity is mediated by the trans-sulfuration pathway amino acids selenohomocysteine and/or selenocysteine. Involvement of superoxide radicals in selenomethionine toxicity in vivo is suggested by the hypersensitivity of a Δsod1 mutant strain, increased resistance afforded by the superoxide scavenger manganese, and inactivation of aconitase. In parallel, we showed that, in vitro, the complete oxidation of the selenol function of selenocysteine or selenohomocysteine by dioxygen is achieved within a few minutes at neutral pH and produces superoxide radicals. These results establish a link between superoxide production and trans-sulfuration pathway seleno-amino acids and emphasize the importance of the selenol function in the mechanism of organic selenium toxicity.
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Affiliation(s)
- Myriam Lazard
- From the Ecole Polytechnique, Laboratoire de Biochimie, CNRS, 91128 Palaiseau Cedex, France
| | - Marc Dauplais
- From the Ecole Polytechnique, Laboratoire de Biochimie, CNRS, 91128 Palaiseau Cedex, France
| | - Sylvain Blanquet
- From the Ecole Polytechnique, Laboratoire de Biochimie, CNRS, 91128 Palaiseau Cedex, France
| | - Pierre Plateau
- From the Ecole Polytechnique, Laboratoire de Biochimie, CNRS, 91128 Palaiseau Cedex, France
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118
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Lazo-Vélez MA, Chávez-Santoscoy A, Serna-Saldivar SO. Selenium-Enriched Breads and Their Benefits in Human Nutrition and Health as Affected by Agronomic, Milling, and Baking Factors. Cereal Chem 2015. [DOI: 10.1094/cchem-05-14-0110-rw] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Marco A. Lazo-Vélez
- Centro de Biotecnología–FEMSA, Escuela de Ingeniería y Ciencias, Tecnológico de Monterrey–Campus Monterrey, Av. Eugenio Garza Sada 2501 Sur, C.P. 64849, Monterrey, NL, Mexico
| | - Alejandra Chávez-Santoscoy
- Centro de Biotecnología–FEMSA, Escuela de Ingeniería y Ciencias, Tecnológico de Monterrey–Campus Monterrey, Av. Eugenio Garza Sada 2501 Sur, C.P. 64849, Monterrey, NL, Mexico
| | - Sergio O. Serna-Saldivar
- Centro de Biotecnología–FEMSA, Escuela de Ingeniería y Ciencias, Tecnológico de Monterrey–Campus Monterrey, Av. Eugenio Garza Sada 2501 Sur, C.P. 64849, Monterrey, NL, Mexico
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Park SO, Yoo YB, Kim YH, Baek KJ, Yang JH, Choi PC, Lee JH, Lee KR, Park KS. Effects of combination therapy of docetaxel with selenium on the human breast cancer cell lines MDA-MB-231 and MCF-7. Ann Surg Treat Res 2015; 88:55-62. [PMID: 25692115 PMCID: PMC4325646 DOI: 10.4174/astr.2015.88.2.55] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2014] [Revised: 09/06/2014] [Accepted: 09/25/2014] [Indexed: 12/20/2022] Open
Abstract
Purpose The anticancer property and cytoprotective role of selenium in chemotherapy have been reported. However, the combination effects of selenium on chemotherapy for advanced breast cancer have not yet been clearly defined. The purpose of this study was to investigate the combined effects of selenium on chemotherapy using docetaxel on breast cancer cell lines. Methods Under adherent culture conditions, two breast cancer cell lines, MDA-MB-231 and MCF-7, were treated with docetaxel at 500pM and selenium at 100nM, 1µM, or 10µM. Changes in cell growth, cell cycle duration, and degree of apoptosis after 72 hours in each treated group were evaluated. Results In the MDA-MB-231 cells, the combination therapy group (docetaxel at 500pM plus selenium at 10µM) showed a significantly decreased percentage of cell growth (15% vs. 28%; P = 0.004), a significantly increased percentage of late apoptosis (63% vs. 26%; P = 0.001), and an increased cell cycle arrest in the G2/M phase (P = 0.001) compared with the solitary docetaxel therapy group. Isobologram analysis demonstrated the synergistic effect of the combination therapy in the MDA-MB-231 cells. However, in the MCF-7 cells, no significant differences in the percentage of cell growth apoptosis, the percentage of apoptosis, and the pattern of cell cycle arrest were noted between the combination therapy groups and the solitary docetaxel therapy group. Conclusion Our in vitro study indicated that the combination of selenium with docetaxel inhibits cell proliferation through apoptosis and cell arrest in the G2/M phase in MDA-MB-231 breast cancer cells.
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Affiliation(s)
- Sang O Park
- Department of Emergency Medicine, Konkuk University Medical Center, Konkuk University School of Medicine, Seoul, Korea
| | - Young Bum Yoo
- Department of Surgery, Konkuk University Medical Center, Konkuk University School of Medicine, Seoul, Korea
| | - Yong Hun Kim
- Department of Surgery, Konkuk University Chungju Hospital, Chungju, Korea
| | - Kwang Je Baek
- Department of Emergency Medicine, Konkuk University Medical Center, Konkuk University School of Medicine, Seoul, Korea
| | - Jung-Hyun Yang
- Department of Surgery, Konkuk University Medical Center, Konkuk University School of Medicine, Seoul, Korea
| | - Pil Cho Choi
- Department of Emergency Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Jeong Hun Lee
- Department of Emergency Medicine, Dongguk University Ilsan Hospital, Dongguk University College of Medicine, Goyang, Korea
| | - Kyeong Ryong Lee
- Department of Emergency Medicine, Konkuk University Medical Center, Konkuk University School of Medicine, Seoul, Korea
| | - Kyoung Sik Park
- Department of Surgery, Konkuk University Medical Center, Konkuk University School of Medicine, Seoul, Korea
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Guo X, Song J, Guan T, Wang S, Wang Y, Meng Y, Guo J, Li T, Ma C, Wei J. Characterization of recombinant human gastrointestinal glutathione peroxidase mutant produced inEscherichia coli. Free Radic Res 2015; 49:228-35. [DOI: 10.3109/10715762.2014.995182] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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121
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Hong M, Yang Y, Li C, Xu L, Li D, Li CZ. Study of the effect of molecular structure and alkyl groups bound with tin(iv) on their cytotoxicity of organotin(iv) 2-phenyl-4-selenazole carboxylates. RSC Adv 2015. [DOI: 10.1039/c5ra18445b] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Five organotin(iv) compounds Ph3SnL (1), (R2Sn)4O2L4 [R = n-Bu (2), n-Oct (3)], (R2Sn)4O2L2Cl2 [R = n-Bu (4), Me (5)], HL = 2-phenyl-4-selenazole carboxylic acid, were synthesized, of which triphenyl- and di-n-butyltin(iv) compounds display higher in vitro cytotoxicities.
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Affiliation(s)
- Min Hong
- Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology
- School of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng 252059
- China
| | - Yuanguang Yang
- Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology
- School of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng 252059
- China
| | - Chuan Li
- Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology
- School of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng 252059
- China
| | - Lidan Xu
- Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology
- School of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng 252059
- China
| | - Dacheng Li
- Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology
- School of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng 252059
- China
| | - Chen-zhong Li
- Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology
- School of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng 252059
- China
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123
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Jablonska E, Vinceti M. Selenium and Human Health: Witnessing a Copernican Revolution? JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART C, ENVIRONMENTAL CARCINOGENESIS & ECOTOXICOLOGY REVIEWS 2015; 33:328-68. [PMID: 26074278 DOI: 10.1080/10590501.2015.1055163] [Citation(s) in RCA: 95] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
In humans, selenium was hypothesized to lower the risk of several chronic diseases, mainly due to the antioxidant activity of selenium-containing proteins. Recent epidemiologic and laboratory studies, however, are changing our perception of the biological effects of this nutritionally essential trace element. We reviewed the most recent epidemiologic and biochemical literature on selenium, synthesizing the findings from these studies into a unifying view. Randomized trials have shown that selenium did not protect against cancer and other chronic diseases, but even increased the risk of specific neoplasms such as advanced prostate cancer and skin cancer, in addition to type 2 diabetes. Biochemical studies indicate that selenium may exert a broad pattern of toxic effects at unexpectedly low concentrations. Furthermore, its upregulation of antioxidant proteins (selenium-dependent and selenium-independent) may be a manifestation of self-induced oxidative stress. In conclusion, toxic effects of selenium species occur at lower concentrations than previously believed. Those effects may include a large range of proteomic changes and adverse health effects in humans. Since the effects of environmental exposure to this element on human health still remain partially unknown, but are potentially serious, the toxicity of selenium exposure should be further investigated and considered as a public health priority.
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Affiliation(s)
- Ewa Jablonska
- a Department of Toxicology and Carcinogenesis , Nofer Institute of Occupational Medicine , Lodz , Poland
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124
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McKelvey SM, Horgan KA, Murphy RA. Chemical form of selenium differentially influences DNA repair pathways following exposure to lead nitrate. J Trace Elem Med Biol 2015; 29:151-69. [PMID: 25023848 DOI: 10.1016/j.jtemb.2014.06.005] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Revised: 06/09/2014] [Accepted: 06/12/2014] [Indexed: 10/25/2022]
Abstract
Lead, an environmental toxin is known to induce a broad range of physiological and biochemical dysfunctions in humans through a number of mechanisms including the deactivation of antioxidants thus leading to generation of reactive oxygen species (ROS) and subsequent DNA damage. Selenium on the other hand has been proven to play an important role in the protection of cells from free radical damage and oxidative stress, though its effects are thought to be form and dose dependent. As the liver is the primary organ required for metabolite detoxification, HepG2 cells were chosen to assess the protective effects of various selenium compounds following exposure to the genotoxic agent lead nitrate. Initially DNA damage was quantified using a comet assay, gene expression patterns associated with DNA damage and signalling were also examined using PCR arrays and the biological pathways which were most significantly affected by selenium were identified. Interestingly, the organic type selenium compounds (selenium yeast and selenomethionine) conferred protection against lead induced DNA damage in HepG2 cells; this is evident by reduction in the quantity of DNA present in the comet tail of cells cultured in their presence with lead. This trend also followed through the gene expression changes noted in DNA damage pathways analysed. These results were in contrast with those of inorganic sodium selenite which promoted lead induced DNA damage evident in both the comet assay results and the gene expression analysis. Over all this study provided valuable insights into the effects which various selenium compounds had on the DNA damage and signalling pathway indicating the potential for using organic forms of selenium such as selenium enriched yeast to protect against DNA damaging agents.
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Affiliation(s)
- Shauna M McKelvey
- Alltech Biotechnology Centre, Sarney, Summerhill Rd., Dunboyne, County Meath, Ireland.
| | - Karina A Horgan
- Alltech Biotechnology Centre, Sarney, Summerhill Rd., Dunboyne, County Meath, Ireland
| | - Richard A Murphy
- Alltech Biotechnology Centre, Sarney, Summerhill Rd., Dunboyne, County Meath, Ireland
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125
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Zimmerman MT, Bayse CA, Ramoutar RR, Brumaghim JL. Sulfur and selenium antioxidants: challenging radical scavenging mechanisms and developing structure-activity relationships based on metal binding. J Inorg Biochem 2014; 145:30-40. [PMID: 25600984 DOI: 10.1016/j.jinorgbio.2014.12.020] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2014] [Revised: 12/17/2014] [Accepted: 12/19/2014] [Indexed: 11/30/2022]
Abstract
Because sulfur and selenium antioxidants can prevent oxidative damage, numerous animal and clinical trials have investigated the ability of these compounds to prevent the oxidative stress that is an underlying cause of cardiovascular disease, Alzheimer's disease, and cancer, among others. One of the most common sources of oxidative damage is metal-generated hydroxyl radical; however, very little research has focused on determining the metal-binding abilities and structural attributes that affect oxidative damage prevention by sulfur and selenium compounds. In this review, we describe our ongoing investigations into sulfur and selenium antioxidant prevention of iron- and copper-mediated oxidative DNA damage. We determined that many sulfur and selenium compounds inhibit Cu(I)-mediated DNA damage and that DNA damage prevention varies dramatically when Fe(II) is used in place of Cu(I) to generate hydroxyl radical. Oxidation potentials of the sulfur or selenium compounds do not correlate with their ability to prevent DNA damage, highlighting the importance of metal coordination rather than reactive oxygen species scavenging as an antioxidant mechanism. Additional gel electrophoresis, mass spectrometry, and UV-visible studies confirmed sulfur and selenium antioxidant binding to Cu(I) and Fe(II). Ultimately, our studies established that both the hydroxyl-radical-generating metal ion and the chemical environment of the sulfur or selenium significantly affect DNA damage prevention and that metal coordination is an essential mechanism for these antioxidants.
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Affiliation(s)
| | - Craig A Bayse
- Department of Chemistry and Biochemistry, Old Dominion University, Hampton Boulevard, Norfolk, VA 23529, USA
| | - Ria R Ramoutar
- Department of Chemistry, Clemson University, Clemson, SC 29634-0973, USA
| | - Julia L Brumaghim
- Department of Chemistry, Clemson University, Clemson, SC 29634-0973, USA.
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Yakubov E, Buchfelder M, Eyüpoglu IY, Savaskan NE. Selenium action in neuro-oncology. Biol Trace Elem Res 2014; 161:246-54. [PMID: 25164034 DOI: 10.1007/s12011-014-0111-8] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/04/2014] [Accepted: 08/18/2014] [Indexed: 12/31/2022]
Abstract
The trace element selenium and selenocysteine-carrying selenoproteins play a pivotal role in the brain. Beside the essential function during development and maintenance of brain action, selenium has also been associated with several neurological and neuro-oncological conditions. Reliable supply of selenium is important since selenium compounds can affect tumor microenvironment and neoangiogenesis in malignant gliomas (WHO grade III and IV [glioblastoma, GBM]) via induction of apoptosis and alteration of matrix metalloproteinases expression. Here, we summarize recent findings focusing on the anti-toxicity and cancer-preventive properties of selenium and their implication in current multimodal therapies including temozolomide (Temodal), cyclophosphamide (Endoxan), and cisplatin (DDP, Platiblastin, and Platinol). We shed light on unintended side effects in chemotherapy and the developments of novel combinatorial chemotherapeutics with selenium compounds. We found that selenium and selenium compounds have dual action profiles with direct anti-cancer and chemotherapy-intensifier effects as well as neuroprotective and cytoprotective agents. Current selenium trials and selenium supplementation with focus on neuro-oncology will be discussed with regard to low-adequate-to-high/toxic selenium status.
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Affiliation(s)
- Eduard Yakubov
- Department of Neurosurgery, Universitätsklinikum Erlangen, FAU-Friedrich-Alexander Universität Erlangen-Nürnberg, Schwabachanlage 6, 91054, Erlangen, Germany
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127
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Sun X, Zhong Y, Huang Z, Yang Y. Selenium accumulation in unicellular green alga Chlorella vulgaris and its effects on antioxidant enzymes and content of photosynthetic pigments. PLoS One 2014; 9:e112270. [PMID: 25375113 PMCID: PMC4223018 DOI: 10.1371/journal.pone.0112270] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2014] [Accepted: 10/03/2014] [Indexed: 01/09/2023] Open
Abstract
The aim of the present study was to investigate selenite effects in the unicellular green algae Chlorella vulgaris as a primary producer and the relationship with intracellular bioaccumulation. The effects of selenite were evaluated by measuring the effect of different selenite concentrations on algal growth during a 144 h exposure period. It was found that lower Se concentrations (≤ 75 mg L(-1)) positively promoted C. vulgaris growth and acted as antioxidant by inhibiting lipid peroxidation (LPO) and intracellular reactive oxygen species (ROS). The antioxidative effect was associated with an increase in guaiacol peroxidase (GPX), catalase (CAT), superoxide dismutase (SOD) and photosynthetic pigments. Meanwhile, significant increase in the cell growth rate and organic Se content was also detected in the algae. In contrast, these changes were opposite in C. vulgaris exposed to Se higher than 100 mg L-1. The antioxidation and toxicity appeared to be correlated to Se bioaccumulation, which suggests the appropriate concentration of Se in the media accumulation of C. vulgaris should be 75 mg L-1. Taken together, C. vulgaris possesses tolerance to Se, and Se-Chlorella could be developed as antioxidative food for aquaculture and human health.
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Affiliation(s)
- Xian Sun
- Institute of Hydrobiology, Jinan University, Guangzhou, 510632, P.R. China
- Key Laboratory of Aquatic Eutrophication and Control of Harmful Algal Blooms, Guangdong Higher Education Institutes, Guangzhou, 510632, P.R. China
| | - Yu Zhong
- Institute of Hydrobiology, Jinan University, Guangzhou, 510632, P.R. China
- Key Laboratory of Aquatic Eutrophication and Control of Harmful Algal Blooms, Guangdong Higher Education Institutes, Guangzhou, 510632, P.R. China
| | - Zhi Huang
- Department of Biotechnology, Jinan University, Guangzhou, 510632, P.R. China
| | - Yufeng Yang
- Institute of Hydrobiology, Jinan University, Guangzhou, 510632, P.R. China
- Key Laboratory of Aquatic Eutrophication and Control of Harmful Algal Blooms, Guangdong Higher Education Institutes, Guangzhou, 510632, P.R. China
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128
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Selenium enrichment of lactic acid bacteria and bifidobacteria: A functional food perspective. Trends Food Sci Technol 2014. [DOI: 10.1016/j.tifs.2014.07.006] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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129
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Erkekoglu P, Chao MW, Ye W, Ge J, Trudel LJ, Skipper PL, Kocer-Gumusel B, Engelward BP, Wogan GN, Tannenbaum SR. Cytoplasmic and nuclear toxicity of 3,5-dimethylaminophenol and potential protection by selenocompounds. Food Chem Toxicol 2014; 72:98-110. [DOI: 10.1016/j.fct.2014.06.031] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2014] [Revised: 06/02/2014] [Accepted: 06/30/2014] [Indexed: 01/20/2023]
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130
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Galinha C, Pacheco AMG, Freitas MDC, Fikrle M, Kučera J, Coutinho J, Maçãs B, Almeida AS, Wolterbeek HT. Selenium in bread and durum wheats grown under a soil-supplementation regime in actual field conditions, determined by cyclic and radiochemical neutron activation analysis. J Radioanal Nucl Chem 2014. [DOI: 10.1007/s10967-014-3455-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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131
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Galinha C, Sánchez-Martínez M, Pacheco AMG, Freitas MDC, Coutinho J, Maçãs B, Almeida AS, Pérez-Corona MT, Madrid Y, Wolterbeek HT. Characterization of selenium-enriched wheat by agronomic biofortification. Journal of Food Science and Technology 2014; 52:4236-45. [PMID: 26139888 DOI: 10.1007/s13197-014-1503-7] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 07/29/2014] [Indexed: 01/20/2023]
Abstract
Agronomic biofortification of staple crops is an effective way to enhance their contents in essential nutrients up the food chain, with a view to correcting for their deficiencies in animal or human status. Selenium (Se) is one such case, for its uneven distribution in the continental crust and, therefore, in agricultural lands easily translates into substantial variation in nutritional intakes. Cereals are far from being the main sources of Se on a content basis, but they are likely the major contributors to intake on a dietary basis. To assess their potential to assimilate and biotransform Se, bread and durum wheat were enriched with Se through foliar and soil addition at an equivalent field rate of 100 g of Se per hectare (ha), using sodium selenate and sodium selenite as Se-supplementation matrices, in actual field conditions throughout. Biotransformation of inorganic Se was evaluated by using HPLC-ICP-MS after enzymatic hydrolysis for Se-species extraction in the resulting mature wheat grains. Selenomethionine and Se(VI) were identified and quantified: the former was the predominant species, representing 70-100 % of the total Se in samples; the maximum amount of inorganic Se was below 5 %. These results were similar for both supplementation methods and for both wheat varieties. Judging from the present results, one can conclude that agronomic biofortification of wheat may improve the nutritional quality of wheat grains with significant amounts of selenomethionine, which is an attractive option for increasing the Se status in human diets through Se-enriched, wheat-based foodstuff.
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Affiliation(s)
- Catarina Galinha
- CERENA-IST, University of Lisbon, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal ; CCTN-IST, University of Lisbon, Estrada Nacional 10, 2695-066 Bobadela, Portugal ; Department of Radiation Science and Technology, Faculty of Applied Sciences, Delft University of Technology, Mekelweg 15, 2629 JB Delft, The Netherlands
| | - María Sánchez-Martínez
- Departamento de Química Analítica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Avda. Complutense s/n, 28040 Madrid, Spain
| | - Adriano M G Pacheco
- CERENA-IST, University of Lisbon, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal
| | | | - José Coutinho
- INIAV, National Institute of Agricultural and Veterinary Research, Estrada de Gil Vaz, 7350-228 Elvas, Portugal
| | - Benvindo Maçãs
- INIAV, National Institute of Agricultural and Veterinary Research, Estrada de Gil Vaz, 7350-228 Elvas, Portugal
| | - Ana Sofia Almeida
- INIAV, National Institute of Agricultural and Veterinary Research, Estrada de Gil Vaz, 7350-228 Elvas, Portugal
| | - María Teresa Pérez-Corona
- Departamento de Química Analítica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Avda. Complutense s/n, 28040 Madrid, Spain
| | - Yolanda Madrid
- Departamento de Química Analítica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Avda. Complutense s/n, 28040 Madrid, Spain
| | - Hubert T Wolterbeek
- Department of Radiation Science and Technology, Faculty of Applied Sciences, Delft University of Technology, Mekelweg 15, 2629 JB Delft, The Netherlands
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Sun HJ, Rathinasabapathi B, Wu B, Luo J, Pu LP, Ma LQ. Arsenic and selenium toxicity and their interactive effects in humans. ENVIRONMENT INTERNATIONAL 2014; 69:148-58. [PMID: 24853282 DOI: 10.1016/j.envint.2014.04.019] [Citation(s) in RCA: 232] [Impact Index Per Article: 21.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2014] [Revised: 04/29/2014] [Accepted: 04/29/2014] [Indexed: 05/15/2023]
Abstract
Arsenic (As) and selenium (Se) are unusual metalloids as they both induce and cure cancer. They both cause carcinogenesis, pathology, cytotoxicity, and genotoxicity in humans, with reactive oxygen species playing an important role. While As induces adverse effects by decreasing DNA methylation and affecting protein 53 expression, Se induces adverse effects by modifying thioredoxin reductase. However, they can react with glutathione and S-adenosylmethionine by forming an As-Se complex, which can be secreted extracellularly. We hypothesize that there are two types of interactions between As and Se. At low concentration, Se can decrease As toxicity via excretion of As-Se compound [(GS3)2AsSe](-), but at high concentration, excessive Se can enhance As toxicity by reacting with S-adenosylmethionine and glutathione, and modifying the structure and activity of arsenite methyltransferase. This review is to summarize their toxicity mechanisms and the interaction between As and Se toxicity, and to provide suggestions for future investigations.
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Affiliation(s)
- Hong-Jie Sun
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, Jiangsu 210046, China
| | - Bala Rathinasabapathi
- Horticultural Sciences Department, University of Florida, Gainesville, FL 32611, United States
| | - Bing Wu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, Jiangsu 210046, China
| | - Jun Luo
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, Jiangsu 210046, China
| | - Li-Ping Pu
- Suzhou Health College, Suzhou, Jiangsu 215000, China
| | - Lena Q Ma
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, Jiangsu 210046, China; Soil and Water Science Department, University of Florida, Gainesville, FL 32611, USA.
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133
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Maity P, Kundu D, Roy R, Ranu BC. A Direct Synthesis of Selenophenes by Cu-Catalyzed One-Pot Addition of a Selenium Moiety to (E,E)-1,3-Dienyl Bromides and Subsequent Nucleophilic Cyclization. Org Lett 2014; 16:4122-5. [DOI: 10.1021/ol501820e] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Pintu Maity
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Debasish Kundu
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Rajdip Roy
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Brindaban C. Ranu
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
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134
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Al-Saleh I, Al-Rouqi R, Obsum CA, Shinwari N, Mashhour A, Billedo G, Al-Sarraj Y, Rabbah A. Mercury (Hg) and oxidative stress status in healthy mothers and its effect on birth anthropometric measures. Int J Hyg Environ Health 2014; 217:567-85. [DOI: 10.1016/j.ijheh.2013.11.001] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2013] [Revised: 11/07/2013] [Accepted: 11/14/2013] [Indexed: 12/31/2022]
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135
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Zhang Y, Zheng S, Zheng JS, Wong KH, Huang Z, Ngai SM, Zheng W, Wong YS, Chen T. Synergistic Induction of Apoptosis by Methylseleninic Acid and Cisplatin, The Role of ROS-ERK/AKT-p53 Pathway. Mol Pharm 2014; 11:1282-93. [DOI: 10.1021/mp400749f] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Yibo Zhang
- Department
of Chemistry, Jinan University, Guangzhou 510632, China
| | - Shanyuan Zheng
- School of Life Sciences and State Key Laboratory
of Agrobiotechnology, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - Jun-Sheng Zheng
- The Third Affiliated
Hospital, Sun-Yat-Sen University, Guangzhou, China
| | - Ka-Hing Wong
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hong Kong, China
| | - Zhi Huang
- Department of Biology, Jinan University, Guangzhou 510632, China
| | - Sai-Ming Ngai
- School of Life Sciences and State Key Laboratory
of Agrobiotechnology, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - Wenjie Zheng
- Department
of Chemistry, Jinan University, Guangzhou 510632, China
| | - Yum-Shing Wong
- School of Life Sciences and State Key Laboratory
of Agrobiotechnology, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - Tianfeng Chen
- Department
of Chemistry, Jinan University, Guangzhou 510632, China
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136
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de Oliveira IM, Degrandi TH, Jorge PM, Saffi J, Rosa RM, Guecheva TN, Henriques JAP. Dicholesteroyl diselenide: Cytotoxicity, genotoxicity and mutagenicity in the yeast Saccharomyces cerevisiae and in Chinese hamster lung fibroblasts. MUTATION RESEARCH-GENETIC TOXICOLOGY AND ENVIRONMENTAL MUTAGENESIS 2014; 763:1-11. [DOI: 10.1016/j.mrgentox.2013.12.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2013] [Revised: 10/25/2013] [Accepted: 12/28/2013] [Indexed: 12/30/2022]
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137
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Effect of selenate on viability and selenomethionine accumulation of Chlorella sorokiniana grown in batch culture. ScientificWorldJournal 2014; 2014:401265. [PMID: 24688385 PMCID: PMC3928859 DOI: 10.1155/2014/401265] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2013] [Accepted: 10/31/2013] [Indexed: 11/18/2022] Open
Abstract
The aim of this work was to study the effect of Se(+VI) on viability, cell morphology, and selenomethionine accumulation of the green alga Chlorella sorokiniana grown in batch cultures. Culture exposed to sublethal Se concentrations of 40 mg·L−1 (212 μM) decreased growth rates for about 25% compared to control. A selenate EC50 value of 45 mg·L−1 (238.2 μM) was determined. Results showed that chlorophyll and carotenoids contents were not affected by Se exposure, while oxygen evolution decreased by half. Ultrastructural studies revealed granular stroma, fingerprint-like appearance of thylakoids which did not compromise cell activity. Unlike control cultures, SDS PAGE electrophoresis of crude extracts from selenate-exposed cell cultures revealed appearance of a protein band identified as 53 kDa Rubisco large subunit of Chlorella sorokiniana, suggesting that selenate affects expression of the corresponding chloroplast gene as this subunit is encoded in the chloroplast DNA. Results revealed that the microalga was able to accumulate up to 140 mg·kg−1 of SeMet in 120 h of cultivation. This paper shows that Chlorella sorokiniana biomass can be enriched in the high value aminoacid SeMet in batch cultures, while keeping photochemical viability and carbon dioxide fixation activity intact, if exposed to suitable sublethal concentrations of Se.
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138
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Investigating the Effects of Se Solid Phase Substitution in Jarosite Minerals Influenced by Bacterial Reductive Dissolution. MINERALS 2014. [DOI: 10.3390/min4010017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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139
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Johnpeter JP, Gupta G, Kumar JM, Srinivas G, Nagesh N, Therrien B. Biological Studies of Chalcogenolato-Bridged Dinuclear Half-Sandwich Complexes. Inorg Chem 2013; 52:13663-73. [DOI: 10.1021/ic4022307] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Justin P. Johnpeter
- Institut de Chimie, Université de Neuchâtel, Avenue de Bellevaux 51, CH-2000 Neuchâtel, Switzerland
| | - Gajendra Gupta
- Institut de Chimie, Université de Neuchâtel, Avenue de Bellevaux 51, CH-2000 Neuchâtel, Switzerland
| | - Jerald Mahesh Kumar
- CSIR-Centre for Cellular and Molecular Biology, Uppal Road, Habsiguda, Hyderabad 500 007, India
| | - Gunda Srinivas
- CSIR-Centre for Cellular and Molecular Biology, Uppal Road, Habsiguda, Hyderabad 500 007, India
| | - Narayana Nagesh
- CSIR-Centre for Cellular and Molecular Biology, Uppal Road, Habsiguda, Hyderabad 500 007, India
| | - Bruno Therrien
- Institut de Chimie, Université de Neuchâtel, Avenue de Bellevaux 51, CH-2000 Neuchâtel, Switzerland
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140
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Gupta S, Jaworska-Bieniek K, Lubinski J, Jakubowska A. Can selenium be a modifier of cancer risk in CHEK2 mutation carriers? Mutagenesis 2013; 28:625-9. [PMID: 24106007 DOI: 10.1093/mutage/get050] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Selenium is an essential trace element for humans, playing an important role in various major metabolic pathways. Selenium helps to protect the body from the poisonous effects of heavy metals and other harmful substances. Medical studies have provided evidence of selenium supplementation in preventing certain cancers. Low and too high selenium (Se) status correlates with increased risk of e.g. lung, larynx, colorectal and prostate cancers. A higher level of selenium and supplementation with selenium has been shown to be associated with substantially reduced cancer mortality. Selenium exerts its biological roles through selenoproteins, which are involved in oxidoreductions, redox signalling, antioxidant defence, thyroid hormone metabolism and immune responses. Checkpoint kinase 2 (CHEK2) is an important signal transducer of cellular responses to DNA damage and acts as a tumour suppressor gene. Mutations in the CHEK2 gene have been shown to be associated with increased risks of several cancers. Four common mutations in CHEK2 gene (1100delC, IVS2+1G>A, del5395 and I157T) have been identified in the Polish population. Studies have provided evidence that CHEK2-truncating and/or missense mutations are associated with increased risk of breast, prostate, thyroid, colon and kidney cancers. The variability in penetrance and cancer expression in CHEK2 mutation carriers can probably be explained by the influence of other genetic or environmental factors. One of the possible candidates is Se, which together with genetic variations in selenoprotein genes may influence susceptibility to cancer risk.
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Affiliation(s)
- Satish Gupta
- International Hereditary Cancer Centre, Department of Genetics and Pathology, Pomeranian Medical University, Polabska 4, 70-115, Szczecin, Poland and
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141
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Schumacher RF, Rosário AR, Leite MR, Zeni G. Cyclization of homopropargyl chalcogenides by copper(II) salts: selective synthesis of 2,3-dihydroselenophenes, 3-arylselenophenes, and 3-haloselenophenes/thiophenes. Chemistry 2013; 19:13059-64. [PMID: 24038325 DOI: 10.1002/chem.201302129] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2013] [Indexed: 12/28/2022]
Abstract
Copper(II) halide mediated cyclization of homopropargyl chalcogenides gave three types of chalcogenophene derivatives. Selective product formation was achieved by controlling solvent, temperature, and atmosphere. By using CuBr2 and 1,2-dichloroethane at room temperature under ambient atmosphere, 4-bromo dihydroselenophene derivatives were obtained, whereas CuBr2 and 1,2-dichloroethane at reflux gave selectively 2-substituted selenophenes. When 1,2-dichloroethane was replaced by dimethylacetamide, 3-halo-selenophenes were obtained exclusively. The versatility of chalcogenophenes was also studied by reaction of 3-haloselenophenes with terminal alkynes under Sonogashira conditions affording the cross-coupled products. In addition, the reaction of 3-haloselenophenes with boronic acids gave the corresponding Suzuki-type products in good yields.
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Affiliation(s)
- Ricardo F Schumacher
- Laboratório de Síntese, Reatividade, Avaliação Farmacológica e Toxicológica de Organocalcogênios, Universidade Federal de Santa Maria, Santa Maria, Rio Grande do Sul, 97105-900 (Brazil)
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142
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Hart WE, Marczak SP, Kneller AR, French RA, Morris DL. The abilities of selenium dioxide and selenite ion to coordinate DNA-bound metal ions and decrease oxidative DNA damage. J Inorg Biochem 2013; 125:1-8. [DOI: 10.1016/j.jinorgbio.2013.03.016] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2012] [Revised: 03/01/2013] [Accepted: 03/18/2013] [Indexed: 01/15/2023]
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143
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Xu BB, Shi P, Guan QY, Shi X, Zhao GL. Synthesis, crystal structure, and biological activity of a nickel(II) complex constructed by 2-phenyl-4-selenazole carboxylic acid and 1,10-phenanthroline. J COORD CHEM 2013. [DOI: 10.1080/00958972.2013.811497] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Bao-Bao Xu
- a Xingzhi College , Zhejiang Normal University , Jinhua , China
| | - Pei Shi
- b College of Chemistry and Life Sciences , Zhejiang Normal University , Jinhua , China
| | - Quan-Yin Guan
- b College of Chemistry and Life Sciences , Zhejiang Normal University , Jinhua , China
| | - Xia Shi
- b College of Chemistry and Life Sciences , Zhejiang Normal University , Jinhua , China
| | - Guo-Liang Zhao
- a Xingzhi College , Zhejiang Normal University , Jinhua , China
- b College of Chemistry and Life Sciences , Zhejiang Normal University , Jinhua , China
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144
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Wang Z, Fan YQ, Shi L, Xu YG. Synthesis, crystal structure, and biological activities of a Zn(II) complex with a Se substituted Schiff base. J COORD CHEM 2013. [DOI: 10.1080/00958972.2013.797573] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Zhi Wang
- a Jiangsu Key Laboratory of Drug Design and Optimization, Department of Medicinal Chemistry , China Pharmaceutical University , Nanjing , P.R. China
| | - Yi-Qiao Fan
- a Jiangsu Key Laboratory of Drug Design and Optimization, Department of Medicinal Chemistry , China Pharmaceutical University , Nanjing , P.R. China
| | - Lei Shi
- a Jiangsu Key Laboratory of Drug Design and Optimization, Department of Medicinal Chemistry , China Pharmaceutical University , Nanjing , P.R. China
| | - Yun-Gen Xu
- a Jiangsu Key Laboratory of Drug Design and Optimization, Department of Medicinal Chemistry , China Pharmaceutical University , Nanjing , P.R. China
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145
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Wrobel JK, Seelbach MJ, Chen L, Power RF, Toborek M. Supplementation with Selenium-Enriched Yeast Attenuates Brain Metastatic Growth. Nutr Cancer 2013; 65:563-70. [DOI: 10.1080/01635581.2013.775315] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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146
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Savery LC, Evers DC, Wise SS, Falank C, Wise J, Gianios C, Kerr I, Payne R, Thompson WD, Perkins C, Zheng T, Zhu C, Benedict L, Wise JP. Global mercury and selenium concentrations in skin from free-ranging sperm whales (Physeter macrocephalus). THE SCIENCE OF THE TOTAL ENVIRONMENT 2013; 450-451:59-71. [PMID: 23467177 DOI: 10.1016/j.scitotenv.2013.01.070] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2012] [Revised: 01/16/2013] [Accepted: 01/23/2013] [Indexed: 06/01/2023]
Abstract
Pollution of the ocean by mercury (Hg) is a global concern. Hg persists, bioaccumulates and is toxic putting high trophic consumers at risk. The sperm whale (Physeter macrocephalus), is a sentinel of ocean health due to its wide distribution, longevity and high trophic level. Our aim was to survey Hg concentrations worldwide in the skin of free-ranging sperm whales considering region, gender and age. Samples were collected from 343 whales in 17 regions during the voyage of the research vessel, Odyssey, between 1999 and 2005. Skin was analyzed for total Hg and detected in all but three samples with a global mean of 2.5±0.1 μg g(-1) ranging from 0.1 to 16.0 μg g(-1). The Mediterranean Sea had the highest regional mean with 6.1 μg g(-1) followed by Australia with 3.5 μg g(-1). Considering gender, females and males did not have significantly different global Hg concentrations. The variation among regions for females was significantly different with highest levels in the Mediterranean and lowest in Sri Lanka; however, males were not significantly different among regions. Considering age in males, adults and subadults did not have significantly different Hg concentrations, and were not significantly different among regions. The toxic effects of these Hg concentrations are uncertain. Selenium (Se), an essential element, antagonizes Hg at equimolar amounts. We measured total Se concentrations and found detectable levels in all samples with a global mean of 33.1±1.1 μg g(-1) ranging from 2.5 to 179 μg g(-1). Se concentrations were found to be several fold higher than Hg concentrations with the average Se:Hg molar ratio being 59:1 and no correlation between the two elements. It is possible Hg is being detoxified in the skin by another mechanism. These data provide the first global analysis of Hg and Se concentrations in a free-ranging cetacean.
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Affiliation(s)
- Laura C Savery
- Wise Laboratory of Environmental and Genetic Toxicology, University of Southern Maine, P.O. Box 9300, 96 Falmouth St., Portland, ME 04104, USA
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147
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Selenium and prostate cancer prevention: insights from the selenium and vitamin E cancer prevention trial (SELECT). Nutrients 2013; 5:1122-48. [PMID: 23552052 PMCID: PMC3705339 DOI: 10.3390/nu5041122] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2013] [Revised: 03/11/2013] [Accepted: 03/19/2013] [Indexed: 12/31/2022] Open
Abstract
The Selenium and Vitamin E Cancer Prevention Trial (SELECT) was conducted to assess the efficacy of selenium and vitamin E alone, and in combination, on the incidence of prostate cancer. This randomized, double-blind, placebo-controlled, 2 × 2 factorial design clinical trial found that neither selenium nor vitamin E reduced the incidence of prostate cancer after seven years and that vitamin E was associated with a 17% increased risk of prostate cancer compared to placebo. The null result was surprising given the strong preclinical and clinical evidence suggesting chemopreventive activity of selenium. Potential explanations for the null findings include the agent formulation and dose, the characteristics of the cohort, and the study design. It is likely that only specific subpopulations may benefit from selenium supplementation; therefore, future studies should consider the baseline selenium status of the participants, age of the cohort, and genotype of specific selenoproteins, among other characteristics, in order to determine the activity of selenium in cancer prevention.
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148
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Geszke-Moritz M, Moritz M. Quantum dots as versatile probes in medical sciences: Synthesis, modification and properties. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2013; 33:1008-21. [DOI: 10.1016/j.msec.2013.01.003] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2012] [Revised: 12/16/2012] [Accepted: 01/06/2013] [Indexed: 12/29/2022]
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149
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Potnis PA, Mitkus R, Elnabawi A, Squibb K, Powell JL. Role of NF-κB in the oxidative stress-induced lung inflammatory response to iron and selenium at ambient levels. Toxicol Res (Camb) 2013. [DOI: 10.1039/c3tx50012h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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150
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Seng HL, Tiekink ERT. Anti-cancer potential of selenium- and tellurium-containing species: opportunities abound! Appl Organomet Chem 2012. [DOI: 10.1002/aoc.2928] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Hoi-Ling Seng
- Department of Chemistry; University of Malaya; 50603 Kuala Lumpur Malaysia
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