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Ahmed Mohamed Z, Yang J, Wen J, Jia F, Banerjee S. SEPHS1 Gene: A new master key for neurodevelopmental disorders. Clin Chim Acta 2024; 562:119844. [PMID: 38960024 DOI: 10.1016/j.cca.2024.119844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2024] [Revised: 06/30/2024] [Accepted: 06/30/2024] [Indexed: 07/05/2024]
Abstract
The SEPHS1 (Selenophosphate Synthetase 1) gene encodes a critical enzyme for synthesizing selenophosphate, the active donor of selenium (Se) necessary for selenoprotein biosynthesis. Selenoproteins are vital for antioxidant defense, thyroid hormone metabolism, and cellular homeostasis. Mutations in SEPHS1 gene, are associated with neurodevelopmental disorders with developmental delay, poor growth, hypotonia, and dysmorphic features. Due to Se's critical role in brain development and function, SEPHS1 gene has taken center stage in neurodevelopmental research. This review explores the structure and function of the SEPHS1 gene, its role in neurodevelopment, and the implications of its dysregulation for neurodevelopmental disorders. Therapeutic strategies, including Se supplementation, gene therapy, and targeted therapies, are discussed as potential interventions to address SEPHS1 associated neurodevelopmental dysfunction. The study's findings reveal how SEPHS1 mutations disrupt neurodevelopment, emphasizing the gene's intolerance to loss of function. Future research should focus on functional characterization of SEPHS1 variants, broader genetic screenings, and therapeutic developments.
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Affiliation(s)
- Zakaria Ahmed Mohamed
- Department of Genetics, College of Basic Medical Sciences, Jilin University, Changchun 130021, China; Department of Developmental and Behavioral Pediatrics, The First Hospital of Jilin University, Jilin University, Changchun, China
| | - Jianli Yang
- Department of Genetics, College of Basic Medical Sciences, Jilin University, Changchun 130021, China
| | - Jianping Wen
- Department of Genetics, College of Basic Medical Sciences, Jilin University, Changchun 130021, China
| | - Feiyong Jia
- Department of Developmental and Behavioral Pediatrics, The First Hospital of Jilin University, Jilin University, Changchun, China
| | - Santasree Banerjee
- Department of Genetics, College of Basic Medical Sciences, Jilin University, Changchun 130021, China.
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Yan P, Wang Y, Yu C, Piao J, Li S, Liu Y, Li S. The Targeted Regulation of BDUbc and BDSKL1 Enhances Resistance to Blight in Bambusa pervariabilis × Dendrocalamopsis grandis. Int J Mol Sci 2024; 25:569. [PMID: 38203739 PMCID: PMC10779405 DOI: 10.3390/ijms25010569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Revised: 12/23/2023] [Accepted: 12/29/2023] [Indexed: 01/12/2024] Open
Abstract
Arthrinium phaeospermum is the major pathogen responsible for the significant stem disease "blight" in B. pervariabilis × D. grandis. The interacting proteins of the key pathogenic factor ApCtf1β, BDUbc and BDSKL1, have previously been obtained by two-hybrid, BiFC, GST pull-down yeast assays. However, the functions of these interacting proteins remain unknown. This study successfully obtained transgenic plants overexpressing BDUbc, BDSKL1, and BDUbc + BDSKL1 via Agrobacterium-mediated gene overexpression. qRT-PCR analysis revealed significantly increased expression levels of BDUbc and BDSKL1 in the transgenic plants. After infection with the pathogenic spore suspension, the disease incidence and severity index significantly decreased across all three transgenic plants, accompanied by a marked increase in defense enzyme levels. Notably, the co-transformed plant, OE-BDUbc + BDSKL1, demonstrated the lowest disease incidence and severity index among the transgenic variants. These results not only indicate that BDUbc and BDSKL1 are disease-resistant genes, but also that these two genes may exhibit a synergistic enhancement effect, which further improves the resistance to blight in Bambusa pervariabilis × Dendrocalamopsis grandis.
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Affiliation(s)
- Peng Yan
- College of Forestry, Sichuan Agricultural University, Chengdu 611130, China; (P.Y.); (Y.W.); (C.Y.); (J.P.); (S.L.); (Y.L.)
| | - Yisi Wang
- College of Forestry, Sichuan Agricultural University, Chengdu 611130, China; (P.Y.); (Y.W.); (C.Y.); (J.P.); (S.L.); (Y.L.)
| | - Cailin Yu
- College of Forestry, Sichuan Agricultural University, Chengdu 611130, China; (P.Y.); (Y.W.); (C.Y.); (J.P.); (S.L.); (Y.L.)
| | - Jingmei Piao
- College of Forestry, Sichuan Agricultural University, Chengdu 611130, China; (P.Y.); (Y.W.); (C.Y.); (J.P.); (S.L.); (Y.L.)
| | - Shuying Li
- College of Forestry, Sichuan Agricultural University, Chengdu 611130, China; (P.Y.); (Y.W.); (C.Y.); (J.P.); (S.L.); (Y.L.)
| | - Yinggao Liu
- College of Forestry, Sichuan Agricultural University, Chengdu 611130, China; (P.Y.); (Y.W.); (C.Y.); (J.P.); (S.L.); (Y.L.)
| | - Shujiang Li
- College of Forestry, Sichuan Agricultural University, Chengdu 611130, China; (P.Y.); (Y.W.); (C.Y.); (J.P.); (S.L.); (Y.L.)
- National Forestry and Grassland Administration Key Laboratory of Forest Resources Conservation and Ecological Safety on the Upper Reaches of the Yangtze River, Chengdu 611130, China
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Smith MR, Hu X, Jarrell ZR, He X, Orr M, Fernandes J, Chandler JD, Walker DI, Esper A, Marts L, Neujahr DC, Jones DP, Go YM. Study on the Relationship between Selenium and Cadmium in Diseased Human Lungs. ADVANCES IN REDOX RESEARCH 2023; 7. [PMID: 37034445 PMCID: PMC10078579 DOI: 10.1016/j.arres.2023.100065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
Cadmium (Cd) is a toxic environmental metal that interacts with selenium (Se) and contributes to many lung diseases. Humans have widespread exposures to Cd through diet and cigarette smoking, and studies in rodent models show that Se can protect against Cd toxicities. We sought to identify whether an antagonistic relationship existed between Se and Cd burdens and determine whether this relationship may associate with metabolic variation within human lungs. We performed metabolomics of 31 human lungs, including 25 with end-stage lung disease due to idiopathic pulmonary fibrosis, cystic fibrosis, chronic obstructive lung disease (COPD)/emphysema and other causes, and 6 non-diseased lungs. Results showed pathway associations with Cd including amino acid, lipid and energy-related pathways. Metabolic pathways varying with Se had considerable overlap with these pathways. Hierarchical cluster analysis (HCA) of individuals according to metabolites associated with Cd showed partial separation of disease types, with COPD/emphysema in the cluster with highest Cd, and non-diseased lungs in the cluster with the lowest Cd. When compared to HCA of metabolites associated with Se, the results showed that the cluster containing COPD/emphysema had the lowest Se, and the non-diseased lungs had the highest Se. A greater number of pathway associations occurred for Cd to Se ratio than either Cd or Se alone, indicating that metabolic patterns were more dependent on Cd to Se ratio than on either alone. Network analysis of interactions of Cd and Se showed network centrality was associated with pathways linked to polyunsaturated fatty acids involved in inflammatory signaling. Overall, the data show that metabolic pathway responses in human lung vary with Cd and Se in a pattern suggesting that Se is antagonistic to Cd toxicity in humans.
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Affiliation(s)
- Matthew Ryan Smith
- Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Department of Medicine, School of Medicine at Emory University, Atlanta, GA, USA
- Atlanta Department of Veterans Affairs Medical Center, Decatur, GA, USA
| | - Xin Hu
- Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Department of Medicine, School of Medicine at Emory University, Atlanta, GA, USA
| | - Zachery R Jarrell
- Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Department of Medicine, School of Medicine at Emory University, Atlanta, GA, USA
| | - Xiaojia He
- Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Department of Medicine, School of Medicine at Emory University, Atlanta, GA, USA
| | - Michael Orr
- Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Department of Medicine, School of Medicine at Emory University, Atlanta, GA, USA
| | - Jolyn Fernandes
- Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Department of Medicine, School of Medicine at Emory University, Atlanta, GA, USA
- Department of Pediatrics, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
| | - Joshua D. Chandler
- Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Department of Medicine, School of Medicine at Emory University, Atlanta, GA, USA
- Department of Pediatrics, School of Medicine at Emory University, Atlanta, GA, USA
| | - Douglas I. Walker
- Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Department of Medicine, School of Medicine at Emory University, Atlanta, GA, USA
- Department of Environmental Medicine and Public Health, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Annette Esper
- Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Department of Medicine, School of Medicine at Emory University, Atlanta, GA, USA
| | - Lucian Marts
- Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Department of Medicine, School of Medicine at Emory University, Atlanta, GA, USA
| | - David C. Neujahr
- Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Department of Medicine, School of Medicine at Emory University, Atlanta, GA, USA
| | - Dean P. Jones
- Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Department of Medicine, School of Medicine at Emory University, Atlanta, GA, USA
- Corresponding authors at: Whitehead Biomedical Research Building, 615 Michael St, Room 225, Atlanta, GA, 30322, USA. (D.P. Jones), (Y.-M. Go)
| | - Young-Mi Go
- Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Department of Medicine, School of Medicine at Emory University, Atlanta, GA, USA
- Corresponding authors at: Whitehead Biomedical Research Building, 615 Michael St, Room 225, Atlanta, GA, 30322, USA. (D.P. Jones), (Y.-M. Go)
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On the energetics of radical adduct formation of OH • with phenol analogs and aniline. ACTA CHIMICA SLOVACA 2022. [DOI: 10.2478/acs-2022-0002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
Theoretical studies on aniline, phenol, benzenethiol, benzeneselenol, and their corresponding adducts with hydroxyl radical in possible positions on a hydrocarbon ring are presented. Bond dissociation enthalpies, related to radical scavenging of primary antioxidants, were calculated using the M06–2X/6–311+G** method. Calculated data were compared with available experimental data. Preferable homolytic bond dissociation of the presented molecules with OH• through functional groups X—OH followed by the m–OH ones has been confirmed. The highest antioxidant activity among the investigated positions is predicted for benzeneselenol. Also, the formation of non-covalent van der Waals structures has been shown as important in radical scavenging.
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Dreab A, Bayse CA. Molecular Dynamics Simulations of Reduced and Oxidized TFIIIA Zinc Fingers Free and Interacting with 5S RNA. J Chem Inf Model 2022; 62:903-913. [PMID: 35143196 DOI: 10.1021/acs.jcim.1c01272] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Interactions of zinc finger (ZF) proteins with nucleic acids and proteins play an important role in DNA transcription and repair, biochemical recognition, and protein regulation. The release of Zn2+ through oxidation of cysteine thiolates is associated with disruption of gene expression and DNA repair, preventing tumor growth. Multi-microsecond molecular dynamics (MD) simulations were carried out to examine the effect of Cys oxidation on the ZF456 fragment of transcription factor III A (TFIIIA) and its complex with 5S RNA. In the absence of 5S RNA, the reduced ZF456 peptide undergoes conformational changes in the secondary structure due to the reorientation of the intact ZF domains. Upon oxidation, the individual ZF domains unfold to various degrees, yielding a globular ZF456 peptide with ZF4 and ZF6, responsible for base-specific hydrogen bonds with 5S RNA, losing their ββα-folds. ZF5, on the other hand, participates in nonspecific interactions through its α-helix that conditionally unravels early in the simulation. In the presence of RNA, oxidation of the ZF456 peptide disrupts the key hydrogen bonding interactions between ZF5/ZF6 and 5S RNA. However, interactions with ZF4 are dependent on the protonation state of His119.
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Affiliation(s)
- Ana Dreab
- Department of Chemistry and Biochemistry, Old Dominion University, Norfolk, Virginia 23529, United States
| | - Craig A Bayse
- Department of Chemistry and Biochemistry, Old Dominion University, Norfolk, Virginia 23529, United States
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Jacob C, Abdin AY, Köhler F, Maret W. Bert Vallee-A 20th Century Adventure(r) in Zincology. Int J Mol Sci 2021; 22:ijms222413393. [PMID: 34948190 PMCID: PMC8707161 DOI: 10.3390/ijms222413393] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Accepted: 11/23/2021] [Indexed: 11/16/2022] Open
Affiliation(s)
- Claus Jacob
- Division of Bioorganic Chemistry, School of Pharmacy, Saarland University, D-66123 Saarbruecken, Germany; (A.Y.A.); (F.K.)
- Correspondence: (C.J.); (W.M.)
| | - Ahmad Yaman Abdin
- Division of Bioorganic Chemistry, School of Pharmacy, Saarland University, D-66123 Saarbruecken, Germany; (A.Y.A.); (F.K.)
- CNRS, Centrale Lille, University Lille, UMR 8181–UCCS–Unité de Catalyse et Chimie du Solide, University Artois, F-59000 Lille, France
| | - Frederieke Köhler
- Division of Bioorganic Chemistry, School of Pharmacy, Saarland University, D-66123 Saarbruecken, Germany; (A.Y.A.); (F.K.)
| | - Wolfgang Maret
- Departments of Biochemistry and Nutritional Sciences, School of Life Course and Population Sciences, Faculty of Life, Sciences and Medicine, King’s College London, Franklin-Wilkins Bldg, 150 Stamford St., London SE1 9NH, UK
- Correspondence: (C.J.); (W.M.)
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Abstract
The functions, purposes, and roles of metallothioneins have been the subject of speculations since the discovery of the protein over 60 years ago. This article guides through the history of investigations and resolves multiple contentions by providing new interpretations of the structure-stability-function relationship. It challenges the dogma that the biologically relevant structure of the mammalian proteins is only the one determined by X-ray diffraction and NMR spectroscopy. The terms metallothionein and thionein are ambiguous and insufficient to understand biological function. The proteins need to be seen in their biological context, which limits and defines the chemistry possible. They exist in multiple forms with different degrees of metalation and types of metal ions. The homoleptic thiolate coordination of mammalian metallothioneins is important for their molecular mechanism. It endows the proteins with redox activity and a specific pH dependence of their metal affinities. The proteins, therefore, also exist in different redox states of the sulfur donor ligands. Their coordination dynamics allows a vast conformational landscape for interactions with other proteins and ligands. Many fundamental signal transduction pathways regulate the expression of the dozen of human metallothionein genes. Recent advances in understanding the control of cellular zinc and copper homeostasis are the foundation for suggesting that mammalian metallothioneins provide a highly dynamic, regulated, and uniquely biological metal buffer to control the availability, fluctuations, and signaling transients of the most competitive Zn(II) and Cu(I) ions in cellular space and time.
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Affiliation(s)
- Artur Krężel
- Department of Chemical Biology, Faculty of Biotechnology, University of Wrocław, Wrocław 50-383, Poland
| | - Wolfgang Maret
- Departments of Biochemistry and Nutritional Sciences, School of Life Course Sciences, Faculty of Life Sciences and Medicine, King's College London, London SE1 9NH, U.K
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8
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Abdin AY, Jacob C, Kästner L. The Enigmatic Metallothioneins: A Case of Upward-Looking Research. Int J Mol Sci 2021; 22:5984. [PMID: 34206018 PMCID: PMC8198881 DOI: 10.3390/ijms22115984] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Revised: 05/05/2021] [Accepted: 05/26/2021] [Indexed: 11/17/2022] Open
Abstract
In the mid-1950s, Bert Lester Vallee and his colleague Marvin Margoshes discovered a molecule referred to today as metallothionein (MT). Meanwhile, MTs have been shown to be common in many biological organisms. Despite their prevalence, however, it remains unclear to date what exactly MTs do and how they contribute to the biological function of an organism or organ. We investigate why biochemical research has not yet been able to pinpoint the function(s) of MTs. We shall systematically examine both the discovery of and recent research on Dr. Vallee's beloved family of MT proteins utilizing tools from philosophy of science. Our analysis highlights that Vallee's initial work exhibited features prototypical of a developing research tradition: it was upward-looking, exploratory, and utilized mere interactions. Since the 1960s, MT research has increasingly become intervention- and hypothesis-based while it remained largely upward-looking in character. Whilst there is no reason to think that upward-looking research cannot successfully yield structure-function mappings, it has not yet been successful in the case of MTs. Thus, we suggest it might be time to change track and consider other research strategies looking into the evolution of MTs. Recent studies in mollusks render research in this direction worthy of pursuit.
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Affiliation(s)
- Ahmad Yaman Abdin
- Division of Bioorganic Chemistry, School of Pharmacy, Saarland University, D-66123 Saarbruecken, Germany; (A.Y.A.); (C.J.)
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181–UCCS–Unité de Catalyse et Chimie du Solide, F-59000 Lille, France
| | - Claus Jacob
- Division of Bioorganic Chemistry, School of Pharmacy, Saarland University, D-66123 Saarbruecken, Germany; (A.Y.A.); (C.J.)
| | - Lena Kästner
- Institute of Philosophy, Saarland University, D-66123 Saarbruecken, Germany
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García-Rodríguez A, Moreno-Olivas F, Marcos R, Tako E, Marques CNH, Mahler GJ. The Role of Metal Oxide Nanoparticles, Escherichia coli, and Lactobacillus rhamnosus on Small Intestinal Enzyme Activity. ENVIRONMENTAL SCIENCE. NANO 2020; 7:3940-3964. [PMID: 33815806 PMCID: PMC8011031 DOI: 10.1039/d0en01001d] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Engineered nanomaterials (ENMs) have become common in the food industry, which motivates the need to evaluate ENM effects on human health. Gastrointestinal (GI) in vitro models (e.g. Caco-2, Caco-2/HT29-MTX) have been used in nanotoxicology research. However, the human gut environment is composed of both human cells and the gut microbiota. The goal of this study is to increase the complexity of the Caco-2/HT29-MTX in vitro model by co-culturing human cells with the Gram-positive, commensal Lactobacillus rhamnosus or the Gram-negative, opportunistic Escherichia coli; with the hypothesis that the presence of bacteria would ameliorate the effects of exposure to metal oxide nanoparticles (NPs) such as iron oxide (Fe2O3), silicone dioxide (SiO2), titanium dioxide (TiO2), or zinc oxide (ZnO). To understand this relationship, Caco-2/HT29-MTX cell barriers were acutely co-exposed (4 hours) to bacteria and/or NPs (pristine or in vitro digested). The activity of the brush border membrane (BBM) enzymes intestinal alkaline phosphatase (IAP), aminopeptidase-N (APN), sucrase isomaltase (SI) and the basolateral membrane enzyme (BLM) Na+/K+ ATPase were assessed. Findings show that (i) the human digestion process alters the physicochemical properties of NPs, (ii) large agglomerates of NPs remain entrapped on the apical side of the intestinal barrier, which (iii) affects the activity of BBM enzymes. Interestingly, some NPs effects were attenuated in the presence of either bacterial strains. Confocal microscopy detected bacteria-NPs interactions, which may impede the NP-intestinal cell contact. These results highlight the importance of improving in vitro models to closely mimic the complexities of the human body.
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Affiliation(s)
- Alba García-Rodríguez
- Department of Biomedical Engineering, Binghamton University, Binghamton, NY, 13902, USA
- Binghamton Biofilm Research Center, Binghamton University, Binghamton, NY, 13902, USA
- Department of Biological Sciences, Binghamton University, Binghamton, NY, 1302, USA
- Department of Genetics and Microbiology, Faculty of Bioscience, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Barcelona, 08193, Spain
| | - Fabiola Moreno-Olivas
- Department of Biomedical Engineering, Binghamton University, Binghamton, NY, 13902, USA
- Binghamton Biofilm Research Center, Binghamton University, Binghamton, NY, 13902, USA
| | - Ricard Marcos
- Department of Genetics and Microbiology, Faculty of Bioscience, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Barcelona, 08193, Spain
| | - Elad Tako
- Department of Food Science, Cornell University, Stocking Hall, Ithaca, NY, 14853-7201, USA
| | - Cláudia N. H. Marques
- Binghamton Biofilm Research Center, Binghamton University, Binghamton, NY, 13902, USA
- Department of Biological Sciences, Binghamton University, Binghamton, NY, 1302, USA
| | - Gretchen J. Mahler
- Department of Biomedical Engineering, Binghamton University, Binghamton, NY, 13902, USA
- Binghamton Biofilm Research Center, Binghamton University, Binghamton, NY, 13902, USA
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Yoon C, Lee D, Lee SJ. Regulation of the Central Dogma through Bioinorganic Events with Metal Coordination for Specific Interactions. B KOREAN CHEM SOC 2020. [DOI: 10.1002/bkcs.12090] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Chungwoon Yoon
- Department of Chemistry Institute for Molecular Biology and Genetics, Jeonbuk National University Jeonju 54896 Republic of Korea
| | - Dong‐Heon Lee
- Department of Chemistry Institute for Molecular Biology and Genetics, Jeonbuk National University Jeonju 54896 Republic of Korea
| | - Seung Jae Lee
- Department of Chemistry Institute for Molecular Biology and Genetics, Jeonbuk National University Jeonju 54896 Republic of Korea
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11
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A novel diarylethene‐based fluorescence sensor with a benzohydrazide unit for the detection of Zn
2+. J PHYS ORG CHEM 2020. [DOI: 10.1002/poc.4113] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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12
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Kharma A, Grman M, Misak A, Domínguez-Álvarez E, Nasim MJ, Ondrias K, Chovanec M, Jacob C. Inorganic Polysulfides and Related Reactive Sulfur–Selenium Species from the Perspective of Chemistry. Molecules 2019; 24:molecules24071359. [PMID: 30959902 PMCID: PMC6479598 DOI: 10.3390/molecules24071359] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Revised: 03/28/2019] [Accepted: 03/29/2019] [Indexed: 12/15/2022] Open
Abstract
Polysulfides (H₂Sx) represent a class of reactive sulfur species (RSS) which includes molecules such as H₂S₂, H₂S₃, H₂S₄, and H₂S5, and whose presence and impact in biological systems, when compared to other sulfur compounds, has only recently attracted the wider attention of researchers. Studies in this field have revealed a facet-rich chemistry and biological activity associated with such chemically simple, still unusual inorganic molecules. Despite their chemical simplicity, these inorganic species, as reductants and oxidants, metal binders, surfactant-like "cork screws" for membranes, components of perthiol signalling and reservoirs for inorganic hydrogen sulfide (H₂S), are at the centre of complicated formation and transformation pathways which affect numerous cellular processes. Starting from their chemistry, the hidden presence and various roles of polysulfides in biology may become more apparent, despite their lack of clear analytical fingerprints and often murky biochemical footprints. Indeed, the biological chemistry of H₂Sx follows many unexplored paths and today, the relationship between H₂S and its oxidized H₂Sx species needs to be clarified as a matter of "unmistaken identity". Simultaneously, emerging species, such as HSSeSH and SenS8-n, also need to be considered in earnest.
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Affiliation(s)
- Ammar Kharma
- Division of Bioorganic Chemistry, School of Pharmacy, University of Saarland, D-66123 Saarbruecken, Germany.
| | - Marian Grman
- Institute of Clinical and Translational Research, Biomedical Research Centre, University Science Park for Biomedicine, Slovak Academy of Sciences, 845 05 Bratislava, Slovak.
| | - Anton Misak
- Institute of Clinical and Translational Research, Biomedical Research Centre, University Science Park for Biomedicine, Slovak Academy of Sciences, 845 05 Bratislava, Slovak.
| | - Enrique Domínguez-Álvarez
- Instituto de Química Orgánica General, Consejo Superior de Investigaciones Científicas (IQOG-CSIC), 28006 Madrid, Spain.
| | - Muhammad Jawad Nasim
- Division of Bioorganic Chemistry, School of Pharmacy, University of Saarland, D-66123 Saarbruecken, Germany.
| | - Karol Ondrias
- Institute of Clinical and Translational Research, Biomedical Research Centre, University Science Park for Biomedicine, Slovak Academy of Sciences, 845 05 Bratislava, Slovak.
| | - Miroslav Chovanec
- Cancer Research Institute, Biomedical Research Centre, University Science Park for Biomedicine, Slovak Academy of Sciences, 845 05 Bratislava, Slovak.
| | - Claus Jacob
- Division of Bioorganic Chemistry, School of Pharmacy, University of Saarland, D-66123 Saarbruecken, Germany.
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Abstract
Zinc(II) ions are redox-inert in biology. Yet, their interaction with sulfur of cysteine in cellular proteins can confer ligand-centered redox activity on zinc coordination sites, control protein functions, and generate signalling zinc ions as potent effectors of many cellular processes. The specificity and relative high affinity of binding sites for zinc allow regulation in redox biology, free radical biology, and the biology of reactive species. Understanding the role of zinc in these areas of biology requires an understanding of how cellular Zn2+ is homeostatically controlled and can serve as a regulatory ion in addition to Ca2+, albeit at much lower concentrations. A rather complex system of dozens of transporters and metallothioneins buffer the relatively high (hundreds of micromolar) total cellular zinc concentrations in such a way that the available zinc ion concentrations are only picomolar but can fluctuate in signalling. The proteins targeted by Zn2+ transients include enzymes controlling phosphorylation and redox signalling pathways. Networks of regulatory functions of zinc integrate gene expression and metabolic and signalling pathways at several hierarchical levels. They affect enzymatic catalysis, protein structure and protein-protein/biomolecular interactions and add to the already impressive number of catalytic and structural functions of zinc in an estimated three thousand human zinc proteins. The effects of zinc on redox biology have adduced evidence that zinc is an antioxidant. Without further qualifications, this notion is misleading and prevents a true understanding of the roles of zinc in biology. Its antioxidant-like effects are indirect and expressed only in certain conditions because a lack of zinc and too much zinc have pro-oxidant effects. Teasing apart these functions based on quantitative considerations of homeostatic control of cellular zinc is critical because opposite consequences are observed depending on the concentrations of zinc: pro- or anti-apoptotic, pro- or anti-inflammatory and cytoprotective or cytotoxic. The article provides a biochemical basis for the links between redox and zinc biology and discusses why zinc has pleiotropic functions. Perturbation of zinc metabolism is a consequence of conditions of redox stress. Zinc deficiency, either nutritional or conditioned, and cellular zinc overload cause oxidative stress. Thus, there is causation in the relationship between zinc metabolism and the many diseases associated with oxidative stress.
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Affiliation(s)
- Wolfgang Maret
- Metal Metabolism Group, Department of Nutritional Sciences, School of Life Course Sciences, Faculty of Life Sciences and Medicine, King's College London, London, UK.
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A quick accelerating microwave-assisted sustainable technique: permutated spiro-casing for imaging experiment. Mol Divers 2019; 24:93-106. [DOI: 10.1007/s11030-019-09934-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Accepted: 02/25/2019] [Indexed: 01/04/2023]
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Role of Zinc and Selenium in Oxidative Stress and Immunosenescence: Implications for Healthy Aging and Longevity. HANDBOOK OF IMMUNOSENESCENCE 2019. [PMCID: PMC7121636 DOI: 10.1007/978-3-319-99375-1_66] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Aging is a complex process that includes gradual and spontaneous biochemical and physiological changes which contributes to a decline in performance and increased susceptibility to diseases. Zn and Se are essential trace elements that play a pivotal role in immune functions and antioxidant defense and, consequently, are claimed to play also a role in successful aging trajectories. Consistently with their nature of essential trace elements, a plethora of data obtained “in vitro” and “in vivo” (in humans and animal models) support the relevance of Zn and Se for both the innate and adoptive immune response. Moreover, Zn and Se are strictly involved in the synthesis and regulation of activity of proteins and enzymes, e.g., metallothioneins (MT) and glutathione peroxidase (GPX), that are necessary for our endogenous antioxidant response. This is clearly important to protect our cells from oxidative damage and to slow the decline of our immune system with aging. Age-related changes affecting tissue levels of Zn and Se may indicate that the risk of Zn and Se deficiency increases with aging. However, it is still unclear which of these changes can be the consequence of a “real deficiency” and which can be part of our physiological compensatory response to the accumulating damage occurring in aging. Furthermore, the upregulation of antioxidant proteins (Zn and Se dependent) may be a manifestation of self-induced oxidative stress. By the way, Zn and Se dependent proteins are modulated not only by nutritional status, but also by well-known hallmarks of aging that play antagonistic functions, such as the deregulated nutrient sensing pathways and cellular senescence. Thus, it is not an easy task to conduct Zn or Se supplementation in elderly and it is emerging consistent that these kind of supplementation requires an individualized approach. Anyway, there is consistent support that supplementation with Zn using doses around 10 mg/day is generally safe in elderly and may even improve part of immune performances in those subjects with a baseline deficiency. Regarding Se supplementation, it may induce both beneficial and detrimental effects on cellular immunity depending on the form of Se, supplemental dose, and delivery matrix. The nutritional association of supplements based on “Zn plus Se” is hypothesized to provide additional benefits, but this will likely need a more complex individualized approach. The improvement of our knowledge around screening and detection of Zn and Se deficiency in aging could lead to substantial benefits in terms of efficacy of nutritional supplements aimed at ameliorate performance and health in aging.
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Sarpong-Kumankomah S, Gibson MA, Gailer J. Organ damage by toxic metals is critically determined by the bloodstream. Coord Chem Rev 2018. [DOI: 10.1016/j.ccr.2018.07.007] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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17
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Sands KN, Back TG. Key steps and intermediates in the catalytic mechanism for the reduction of peroxides by the antioxidant ebselen. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.05.027] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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18
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Hu X, Chandler JD, Fernandes J, Orr ML, Hao L, Uppal K, Neujahr DC, Jones DP, Go YM. Selenium supplementation prevents metabolic and transcriptomic responses to cadmium in mouse lung. Biochim Biophys Acta Gen Subj 2018; 1862:2417-2426. [PMID: 29656123 DOI: 10.1016/j.bbagen.2018.04.009] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Accepted: 04/10/2018] [Indexed: 12/19/2022]
Abstract
BACKGROUND The protective effect of selenium (Se) on cadmium (Cd) toxicity is well documented, but underlying mechanisms are unclear. METHODS Male mice fed standard diet were given Cd (CdCl2, 18 μmol/L) in drinking water with or without Se (Na2SeO4, 20 μmol/L) for 16 weeks. Lungs were analyzed for Cd concentration, transcriptomics and metabolomics. Data were analyzed with biostatistics, bioinformatics, pathway enrichment analysis, and combined transcriptome-metabolome-wide association study. RESULTS Mice treated with Cd had higher lung Cd content (1.7 ± 0.4 pmol/mg protein) than control mice (0.8 ± 0.3 pmol/mg protein) or mice treated with Cd and Se (0.4 ± 0.1 pmol/mg protein). Gene set enrichment analysis of transcriptomics data showed that Se prevented Cd effects on inflammatory and myogenesis genes and diminished Cd effects on several other pathways. Similarly, Se prevented Cd-disrupted metabolic pathways in amino acid metabolism and urea cycle. Integrated transcriptome and metabolome network analysis showed that Cd treatment had a network structure with fewer gene-metabolite clusters compared to control. Centrality measurements showed that Se counteracted changes in a group of Cd-responsive genes including Zdhhc11, (protein-cysteine S-palmitoyltransferase), Ighg1 (immunoglobulin heavy constant gamma-1) and associated changes in metabolite concentrations. CONCLUSION Co-administration of Se with Cd prevented Cd increase in lung and prevented Cd-associated pathway and network responses of the transcriptome and metabolome. Se protection against Cd toxicity in lung involves complex systems responses. GENERAL SIGNIFICANCE Environmental Cd stimulates proinflammatory and profibrotic signaling. The present results indicate that dietary or supplemental Se could be useful to mitigate Cd toxicity.
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Affiliation(s)
- Xin Hu
- Division of Pulmonary, Allergy and Critical Care Medicine, Department of Medicine, Emory University, Atlanta, GA 30322, USA
| | - Joshua D Chandler
- Division of Pulmonary, Allergy and Critical Care Medicine, Department of Medicine, Emory University, Atlanta, GA 30322, USA
| | - Jolyn Fernandes
- Division of Pulmonary, Allergy and Critical Care Medicine, Department of Medicine, Emory University, Atlanta, GA 30322, USA
| | - Michael L Orr
- Division of Pulmonary, Allergy and Critical Care Medicine, Department of Medicine, Emory University, Atlanta, GA 30322, USA
| | - Li Hao
- Division of Pulmonary, Allergy and Critical Care Medicine, Department of Medicine, Emory University, Atlanta, GA 30322, USA
| | - Karan Uppal
- Division of Pulmonary, Allergy and Critical Care Medicine, Department of Medicine, Emory University, Atlanta, GA 30322, USA
| | - David C Neujahr
- Division of Pulmonary, Allergy and Critical Care Medicine, Department of Medicine, Emory University, Atlanta, GA 30322, USA
| | - Dean P Jones
- Division of Pulmonary, Allergy and Critical Care Medicine, Department of Medicine, Emory University, Atlanta, GA 30322, USA.
| | - Young-Mi Go
- Division of Pulmonary, Allergy and Critical Care Medicine, Department of Medicine, Emory University, Atlanta, GA 30322, USA.
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Theocharis SE, Margeli AP, Koutselinis A. Metallothionein: A Multifunctional Protein from Toxicity to Cancer. Int J Biol Markers 2018; 18:162-9. [PMID: 14535585 DOI: 10.1177/172460080301800302] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The metallothionein (MT) family is a class of low molecular weight, intracellular and cysteine-rich proteins presenting high affinity for metal ions. Although the members of this family were discovered nearly 40 years ago, their functional significance remains obscure. Four major MT isoforms, MT-1, MT-2, MT-3 and MT-4, have been identified in mammals. MTs are involved in many pathophysiological processes such as metal ion homeostasis and detoxification, protection against oxidative damage, cell proliferation and apoptosis, chemoresistance and radiotherapy resistance. MT isoforms have been shown to be involved in several aspects of the carcinogenic process, cancer development and progression. MT expression has been implicated as a transient response to any form of stress or injury providing cytoprotective action. Although MT participates in the carcinogenic process, its use as a potential marker of tumor differentiation or cell proliferation, or as a predictor of poor prognosis remains unclear. In the present review the involvement of MT in defense mechanisms to toxicity and in carcinogenicity is discussed.
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Affiliation(s)
- S E Theocharis
- Department of Forensic Medicine and Toxicology, Medical School, University of Athens, Greece.
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20
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Anand T, Kumar ASK, Sahoo SK. A novel Schiff base derivative of pyridoxal for the optical sensing of Zn2+ and cysteine. Photochem Photobiol Sci 2018; 17:414-422. [DOI: 10.1039/c7pp00391a] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An easy to prepare novel vitamin B6 cofactor derivative 3-hydroxy-N′-((3 hydroxy-5-(hydroxymethyl)-2-methylpyridin-4-yl)methylene)-2-naphthohydrazide (NPY) was applied for the optical detection of Zn2+ and cysteine in the aqueous DMSO medium.
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Affiliation(s)
- Thangaraj Anand
- Department of Applied Chemistry
- S. V. National Institute of Technology (SVNIT)
- Surat-395007
- India
| | - Ashok S. K. Kumar
- Materials Chemistry Division
- School of Advanced Sciences
- VIT University
- Vellore-632014
- India
| | - Suban K. Sahoo
- Department of Applied Chemistry
- S. V. National Institute of Technology (SVNIT)
- Surat-395007
- India
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21
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Maret W. Zinc in Cellular Regulation: The Nature and Significance of "Zinc Signals". Int J Mol Sci 2017; 18:E2285. [PMID: 29088067 PMCID: PMC5713255 DOI: 10.3390/ijms18112285] [Citation(s) in RCA: 201] [Impact Index Per Article: 28.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Revised: 10/23/2017] [Accepted: 10/26/2017] [Indexed: 11/16/2022] Open
Abstract
In the last decade, we witnessed discoveries that established Zn2+ as a second major signalling metal ion in the transmission of information within cells and in communication between cells. Together with Ca2+ and Mg2+, Zn2+ covers biological regulation with redox-inert metal ions over many orders of magnitude in concentrations. The regulatory functions of zinc ions, together with their functions as a cofactor in about three thousand zinc metalloproteins, impact virtually all aspects of cell biology. This article attempts to define the regulatory functions of zinc ions, and focuses on the nature of zinc signals and zinc signalling in pathways where zinc ions are either extracellular stimuli or intracellular messengers. These pathways interact with Ca2+, redox, and phosphorylation signalling. The regulatory functions of zinc require a complex system of precise homeostatic control for transients, subcellular distribution and traffic, organellar homeostasis, and vesicular storage and exocytosis of zinc ions.
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Affiliation(s)
- Wolfgang Maret
- Metal Metabolism Group, Departments of Biochemistry and Nutritional Sciences, School of Life Course Sciences, Faculty of Life Sciences and Medicine, King's College London, Franklin-Wilkins Bldg, 150 Stamford St., London SE1 9NH, UK.
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22
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Singh BK, Bairy G, Jana R. A General Copper/Manganese Cocatalyzed C-H Selenation of Arenes, Heteroarenes, and Alkenes under Air. ChemistrySelect 2017. [DOI: 10.1002/slct.201701758] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Bijaya Kumar Singh
- Organic and Medicinal Chemistry Division; CSIR-Indian Institute of Chemical Biology; 4 Raja S. C. Mullick Road, Jadavpur Kolkata- 700032, West Bengal India
- Academy of Scientific and Innovative Research (AcSIR); Kolkata- 700032, West Bengal India
| | - Gurupada Bairy
- Organic and Medicinal Chemistry Division; CSIR-Indian Institute of Chemical Biology; 4 Raja S. C. Mullick Road, Jadavpur Kolkata- 700032, West Bengal India
- Academy of Scientific and Innovative Research (AcSIR); Kolkata- 700032, West Bengal India
| | - Ranjan Jana
- Organic and Medicinal Chemistry Division; CSIR-Indian Institute of Chemical Biology; 4 Raja S. C. Mullick Road, Jadavpur Kolkata- 700032, West Bengal India
- Academy of Scientific and Innovative Research (AcSIR); Kolkata- 700032, West Bengal India
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23
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Gopalakrishna R, Gundimeda U, Zhou S, Zung K, Forell K, Holmgren A. Imbalance in Protein Thiol Redox Regulation and Cancer-Preventive Efficacy of Selenium. REACTIVE OXYGEN SPECIES (APEX, N.C.) 2016; 2:272-289. [PMID: 29795790 DOI: 10.20455/ros.2016.851] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Although several experimental studies showed cancer-preventive efficacy of supplemental dietary selenium, human clinical trials questioned this efficacy. Identifying its molecular targets and mechanism is important in understanding this discrepancy. Methylselenol, the active metabolite of selenium, reacts with lipid hydroperoxides bound to protein kinase C (PKC) and is oxidized to methylseleninic acid (MSA). This locally generated MSA selectively inactivates PKC by oxidizing its critical cysteine sulfhydryls. The peroxidatic redox cycle occurring in this process may explain how extremely low concentrations of selenium catalytically modify specific membrane-bound proteins compartmentally separated from glutathione and selectively induce cytotoxicity in promoting cells. Mammalian thioredoxin reductase (TR) is itself a selenoenzyme with a catalytic selenocysteine residue. Together with thioredoxin (Trx), it catalyzes reduction of selenite and selenocystine by NADPH generating selenide which in the presence of oxygen redox cycles producing reactive oxygen species. Trx binds with high affinity to PKC and reverses PKC inactivation. Therefore, established tumor cells overexpressing TR and Trx may escape the cancer-preventive actions of selenium. This suggests that in some cases, certain selenoproteins may counteract selenometabolite actions. Lower concentrations of selenium readily inactivate antiapoptotic PKC isoenzymes e and a which have a cluster of vicinal thiols, thereby inducing apoptosis. Higher concentrations of selenium also inactivate proapoptotic enzymes such as proteolytically activated PKCd fragment, holo-PKCz, caspase-3, and c-Jun N-terminal kinase, which all have a limited number of critical cysteine residues and make tumor cells resistant to selenium-induced apoptosis. This may explain the intriguing U-shaped curve that is seen with dietary selenium intake and the extent of cancer prevention.
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Affiliation(s)
- Rayudu Gopalakrishna
- Department of Cell and Neurobiology, Keck School of Medicine, University of Southern California, Los Angeles, CA 90089, USA
| | - Usha Gundimeda
- Department of Cell and Neurobiology, Keck School of Medicine, University of Southern California, Los Angeles, CA 90089, USA
| | - Sarah Zhou
- Department of Cell and Neurobiology, Keck School of Medicine, University of Southern California, Los Angeles, CA 90089, USA
| | - Kristen Zung
- Department of Cell and Neurobiology, Keck School of Medicine, University of Southern California, Los Angeles, CA 90089, USA
| | - Kaitlyn Forell
- Department of Cell and Neurobiology, Keck School of Medicine, University of Southern California, Los Angeles, CA 90089, USA
| | - Arne Holmgren
- Department of Medical Biochemistry and Biophysics, Karolinska Institute, 171 77 Stockholm, Sweden
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Chalcogen bonding interactions between reducible sulfur and selenium compounds and models of zinc finger proteins. J Inorg Biochem 2016; 157:94-103. [DOI: 10.1016/j.jinorgbio.2016.01.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2015] [Revised: 01/07/2016] [Accepted: 01/09/2016] [Indexed: 02/04/2023]
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25
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Zhang S, Qarah AF, Gari DR, Jin J. Synthesis and Charge Transfer Complex Study of Silicon-containing Chalcogenoethers. PHOSPHORUS SULFUR 2015. [DOI: 10.1080/10426507.2014.938745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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26
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Stefanson AL, Bakovic M. Dietary regulation of Keap1/Nrf2/ARE pathway: focus on plant-derived compounds and trace minerals. Nutrients 2014; 6:3777-801. [PMID: 25244368 PMCID: PMC4179188 DOI: 10.3390/nu6093777] [Citation(s) in RCA: 159] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2014] [Revised: 08/13/2014] [Accepted: 08/14/2014] [Indexed: 01/10/2023] Open
Abstract
It has become increasingly evident that chronic inflammation underpins the development of many chronic diseases including cancer, cardiovascular disease and type 2 diabetes. Oxidative stress is inherently a biochemical dysregulation of the redox status of the intracellular environment, which under homeostatic conditions is a reducing environment, whereas inflammation is the biological response to oxidative stress in that the cell initiates the production of proteins, enzymes, and other compounds to restore homeostasis. At the center of the day-to-day biological response to oxidative stress is the Keap1/Nrf2/ARE pathway, which regulates the transcription of many antioxidant genes that preserve cellular homeostasis and detoxification genes that process and eliminate carcinogens and toxins before they can cause damage. The Keap1/Nrf2/ARE pathway plays a major role in health resilience and can be made more robust and responsive by certain dietary factors. Transient activation of Nrf2 by dietary electrophilic phytochemicals can upregulate antioxidant and chemopreventive enzymes in the absence of actual oxidative stress inducers. Priming the Keap1/Nrf2/ARE pathway by upregulating these enzymes prior to oxidative stress or xenobiotic encounter increases cellular fitness to respond more robustly to oxidative assaults without activating more intense inflammatory NFκB-mediated responses.
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Affiliation(s)
- Amanda L Stefanson
- Department of Human Health and Nutritional Sciences, University of Guelph, 50 Stone Road E, Guelph, Ontario, Canada N1G 2W1.
| | - Marica Bakovic
- Department of Human Health and Nutritional Sciences, University of Guelph, 50 Stone Road E, Guelph, Ontario, Canada N1G 2W1.
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Selenite-mediated production of superoxide radical anions in A549 cancer cells is accompanied by a selective increase in SOD1 concentration, enhanced apoptosis and Se-Cu bonding. J Biol Inorg Chem 2014; 19:813-28. [PMID: 24535002 DOI: 10.1007/s00775-014-1113-x] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2013] [Accepted: 01/23/2014] [Indexed: 12/29/2022]
Abstract
Selenite may exert its cytotoxic effects against cancer cells via the generation of reactive oxygen species (ROS). We investigated sources of, and the cellular response to, superoxide radical anion (O2 (·-)) generated in human A549 lung cancer cells after treatment with selenite. A temporal delay was observed between selenite treatment and increases in O2 (·-) production and biomarkers of apoptosis/necrosis, indicating that the reduction of selenite by the glutathione reductase/NADPH system (yielding O2 (·-)) is a minor contributor to ROS production under these conditions. By contrast, mitochondrial and NADPH oxidase O2 (·-) generation were the major contributors. Treatment with a ROS scavenger [poly(ethylene glycol)-conjugated superoxide dismutase (SOD) or sodium 4,5-dihydroxybenzene-1,3-disulfonate] 20 h after the initial selenite treatment inhibited both ROS generation and apoptosis determined at 24 h. In addition, SOD1 was selectively upregulated and its perinuclear cytoplasmic distribution was colocalised with the cellular distribution of selenium. Interestingly, messenger RNA for manganese superoxide dismutase, catalase, inducible haem oxygenase 1 and glutathione peroxidase either remained unchanged or showed a delayed response to selenite treatment. Colocalisation of Cu and Se in these cells (Weekley et al. in J. Am. Chem. Soc. 133:18272-18279, 2011) potentially results from the formation of a Cu-Se species, as indicated by Cu K-edge extended X-ray absorption fine structure spectra. Overall, SOD1 is upregulated in response to selenite-mediated ROS generation, and this likely leads to an accumulation of toxic hydrogen peroxide that is temporally related to decreased cancer cell viability. Increased expression of SOD1 gene/protein coupled with formation of a Cu-Se species may explain the colocalisation of Cu and Se observed in these cells.
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Antony S, Bayse CA. Density Functional Theory Study of the Attack of Ebselen on a Zinc-Finger Model. Inorg Chem 2013; 52:13803-5. [DOI: 10.1021/ic401429z] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Sonia Antony
- Department of Chemistry and Biochemistry, Old Dominion University, Hampton Boulevard, Norfolk, Virginia 23529, United States
| | - Craig A. Bayse
- Department of Chemistry and Biochemistry, Old Dominion University, Hampton Boulevard, Norfolk, Virginia 23529, United States
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29
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Hydrogen bonding of formo- and thioformohydroxamic acid with methanethiol and methaneselenol as amino acid side chain groups. Struct Chem 2013. [DOI: 10.1007/s11224-013-0309-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Development of a novel antidiabetic zinc complex with an organoselenium ligand at the lowest dosage in KK-Ay mice. J Inorg Biochem 2013; 121:10-5. [DOI: 10.1016/j.jinorgbio.2012.12.008] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2012] [Revised: 12/15/2012] [Accepted: 12/15/2012] [Indexed: 01/11/2023]
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31
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Latorre AO, Caniceiro BD, Fukumasu H, Gardner DR, Lopes FM, Wysochi HL, da Silva TC, Haraguchi M, Bressan FF, Górniak SL. Ptaquiloside reduces NK cell activities by enhancing metallothionein expression, which is prevented by selenium. Toxicology 2013; 304:100-8. [DOI: 10.1016/j.tox.2012.12.010] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2012] [Revised: 12/11/2012] [Accepted: 12/17/2012] [Indexed: 10/27/2022]
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Abstract
The carcinogenicity of cadmium, arsenic, and chromium(VI) compounds has been recognized for some decades. However, the underlying molecular mechanisms seem to be complex and are not completely understood at present. Although, with the exception of chromium(VI), direct DNA damage seems to be of minor importance, interactions with DNA repair processes, tumor suppressor functions, and signal transduction pathways have been described in diverse biological systems. In addition to the induction of damage to cellular macromolecules by reactive oxygen species, the interference with cellular redox regulation by reaction with redox-sensitive protein domains or amino acids may provide one plausible mechanism involved in metal carcinogenicity. Consequences are the distortion of zinc-binding structures and the activation or inactivation of redox-regulated signal transduction pathways, provoking metal-induced genomic instability. Nevertheless, the relevance of the respective mechanisms depends on the actual metal or metal species under consideration and more research is needed to further strengthen this hypothesis.
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Affiliation(s)
- Andrea Hartwig
- Institute of Applied Biosciences, Department of Food Chemistry and Toxicology, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany.
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Weekley CM, Harris HH. Which form is that? The importance of selenium speciation and metabolism in the prevention and treatment of disease. Chem Soc Rev 2013; 42:8870-94. [DOI: 10.1039/c3cs60272a] [Citation(s) in RCA: 371] [Impact Index Per Article: 33.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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34
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Guo L, Wang X. Crosstalk between Phospholipase D and Sphingosine Kinase in Plant Stress Signaling. FRONTIERS IN PLANT SCIENCE 2012; 3:51. [PMID: 22639650 PMCID: PMC3355621 DOI: 10.3389/fpls.2012.00051] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2011] [Accepted: 02/28/2012] [Indexed: 05/20/2023]
Abstract
The activation of phospholipase D (PLD) produces phosphatidic acid (PA), whereas plant sphingosine kinase (SPHK) phosphorylates long-chain bases to generate long-chain base-1-phosphates such as phytosphingosine-1-phosphate (phyto-S1P). PA and phyto-S1P have been identified as lipid messengers. Recent studies have shown that PA interacts directly with SPHKs in Arabidopsis, and that the interaction promotes SPHK activity. However, SPHK and phyto-S1P act upstream of PLDα1 and PA in the stomatal response to abscisic acid (ABA). These findings indicate that SPHK/phyto-S1P and PLD/PA are co-dependent in the amplification of lipid messengers, and that crosstalk between the sphingolipid- and phospholipid-mediated signaling pathways may play important roles in plant stress signaling.
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Affiliation(s)
- Liang Guo
- Department of Biology, University of MissouriSt. Louis, MO, USA
- Donald Danforth Plant Science Center, University of MissouriSt. Louis, MO, USA
| | - Xuemin Wang
- Department of Biology, University of MissouriSt. Louis, MO, USA
- Donald Danforth Plant Science Center, University of MissouriSt. Louis, MO, USA
- *Correspondence: Xuemin Wang, Department of Biology, University of Missouri, St. Louis, MO 63121, USA. e-mail:
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Weekley CM, Aitken JB, Vogt S, Finney LA, Paterson DJ, de Jonge MD, Howard DL, Witting PK, Musgrave IF, Harris HH. Metabolism of selenite in human lung cancer cells: X-ray absorption and fluorescence studies. J Am Chem Soc 2011; 133:18272-9. [PMID: 21957893 PMCID: PMC3237720 DOI: 10.1021/ja206203c] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Selenite is an inorganic form of selenium that has a cytotoxic effect against several human cancer cell lines: one or more selenite metabolites are considered to be responsible for its toxicity. X-ray absorption spectroscopy was used to monitor Se speciation in A549 human lung cancer cells incubated with selenite over 72 h. As anticipated, selenodiglutathione and elemental Se both comprised a large proportion of Se in the cells between 4 and 72 h after treatment, which is in accordance with the reductive metabolism of selenite in the presence of glutathione and glutathione reductase/NADPH system. Selenocystine was also present in the cells but was only detected as a significant component between 24 and 48 h concomitant with a decrease in the proportion of selenocysteine and the viability of the cells. The change in speciation from the selenol, selenocysteine, to the diselenide, selenocystine, is indicative of a change in the redox status of the cells to a more oxidizing environment, likely brought about by metabolites of selenite. X-ray fluorescence microscopy of single cells treated with selenite for 24 h revealed a punctate distribution of Se in the cytoplasm. The accumulation of Se was associated with a greater than 2-fold increase in Cu, which was colocalized with Se. Selenium K-edge extended X-ray absorption fine structure (EXAFS) spectroscopy revealed Se-Se and Se-S bonding, but not Se-Cu bonding, despite the spatial association of Se and Cu. Microprobe X-ray absorption near-edge structure spectroscopy (μ-XANES) showed that the highly localized Se species was mostly elemental Se.
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Affiliation(s)
- Claire M. Weekley
- School of Chemistry and Physics, The University of Adelaide, SA 5005, Australia
| | - Jade B. Aitken
- School of Chemistry, The University of Sydney, NSW 2006, Australia
| | - Stefan Vogt
- X-ray Science Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - Lydia A. Finney
- X-ray Science Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | | | | | | | - Paul K. Witting
- The Discipline of Pathology, Sydney Medical School, The University of Sydney, NSW 2006, Australia
| | - Ian F. Musgrave
- School of Medical Sciences, The University of Adelaide, SA 5005, Australia
| | - Hugh H. Harris
- School of Chemistry and Physics, The University of Adelaide, SA 5005, Australia
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Maret W. Redox biochemistry of mammalian metallothioneins. J Biol Inorg Chem 2011; 16:1079-86. [PMID: 21647775 DOI: 10.1007/s00775-011-0800-0] [Citation(s) in RCA: 111] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2011] [Accepted: 05/25/2011] [Indexed: 11/24/2022]
Abstract
Metallothionein (MT) is a generic name for certain families of structurally rather variable metal-binding proteins. While purely chemical or biological approaches failed to establish a single physiologic function for MTs in any species, a combination of chemical and biological approaches and recent progress in defining the low but significant concentrations of cytosolic free zinc(II) ions have demonstrated that mammalian MTs function in cellular zinc metabolism in specific ways that differ from conventional knowledge about any other metalloprotein. Their thiolate coordination environments make MTs redox-active zinc proteins that exist in different molecular states depending on the availability of cellular zinc and the redox poise. The zinc affinities of MTs cover a range of physiologic zinc(II) ion concentrations and are modulated. Oxidative conditions make more zinc available, while reductive conditions make less zinc available. MTs move from the cytosol to cellular compartments, are secreted from cells, and are taken up by cells. They provide cellular zinc ions in a chemically available form and participate in cellular metal muffling: the combination of physiologic buffering in the steady state and the cellular redistribution and compartmentalization of transiently elevated zinc(II) ion concentrations in the pre-steady state. Cumulative evidence indicates that MTs primarily have a redox-dependent function in zinc metabolism, rather than a zinc-dependent function in redox metabolism.
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Affiliation(s)
- Wolfgang Maret
- King's College London, Metal Metabolism Group, Diabetes and Nutritional Sciences Division, School of Medicine, London UK.
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Gong ZL, Zhao BX, Liu WY, Lv HS. A new highly selective “turn on” fluorescent sensor for zinc ion based on a pyrazoline derivative. J Photochem Photobiol A Chem 2011. [DOI: 10.1016/j.jphotochem.2010.11.014] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Quintal SM, dePaula QA, Farrell NP. Zinc finger proteins as templates for metal ion exchange and ligand reactivity. Chemical and biological consequences. Metallomics 2011; 3:121-39. [PMID: 21253649 DOI: 10.1039/c0mt00070a] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Zinc finger reactions with inorganic ions and coordination compounds are as diverse as the zinc fingers themselves. Use of metal ions such as Co(2+) and Cd(2+) has given structural, thermodynamic and kinetic information on zinc fingers and zinc-finger-DNA/RNA interactions. It is a general truism that alteration of the coordination sphere in the finger environment will disrupt the recognition with DNA/RNA and this has implications for mechanism of toxicity and carcinogenesis of metal ions. Structural zinc fingers are susceptible to electrophilic attack and the recognition that the coordination sphere of inorganic compounds may be modulated for control of electrophilic attack on zinc fingers raises the possibility of systematic studies of zinc fingers as drug targets using inorganic chemistry. Some inorganic compounds such as those of As(III) and Au(I) may exert their biological effects through inactivation of zinc fingers and novel approaches to specifically attack the zinc-bound ligands using Co(III)-Schiff bases and Platinum(II)-Nucleobase compounds have been proposed. The genomic importance of zinc fingers suggests that the "coordination chemistry" of zinc fingers themselves is ripe for exploration to design new targets for medicinal inorganic chemistry.
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Affiliation(s)
- Susana M Quintal
- Department of Chemistry, Virginia Commonwealth University, 1001 W. Main St., Richmond, VA 23284-2006, USA
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Bayse CA, Pavlou A. Tuning the activity of glutathione peroxidase mimics through intramolecular Se⋯N,O interactions: A DFT study incorporating solvent-assisted proton exchange (SAPE). Org Biomol Chem 2011; 9:8006-15. [DOI: 10.1039/c1ob05827d] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Sreekanth B, Krishnamurthy G, Naik HSB, Prabhakara MC, Vishnuvardhan TK. Fe(II) Complexes Containing Bioactive Ligands: Synthesis, DNA Binding, and Cleavage Studies. ACTA ACUST UNITED AC 2010. [DOI: 10.1080/15533174.2010.522665] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- B. Sreekanth
- a Department of Biotechnology , Acharya Institute of Technology , Bangalore, Karnataka, India
| | - G. Krishnamurthy
- b Department of Chemistry , Sahyadri Science College , Shimoga, Karnataka, India
| | - H. S. Bhojya Naik
- c Department of PG Studies and Research in Industrial Chemistry, School of Chemical Sciences , Kuvempu University , Shankaraghatta, Shimoga, Karnataka
| | - M. C. Prabhakara
- c Department of PG Studies and Research in Industrial Chemistry, School of Chemical Sciences , Kuvempu University , Shankaraghatta, Shimoga, Karnataka
| | - T. K. Vishnuvardhan
- d Department of Chemistry , Acharya Institute of Technology , Bangalore, Karnataka, India
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41
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Dessal AL, Prades R, Giralt E, Smrcka AV. Rational design of a selective covalent modifier of G protein βγ subunits. Mol Pharmacol 2010; 79:24-33. [PMID: 20881007 DOI: 10.1124/mol.110.068155] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
G protein-coupled receptors transduce signals through heterotrimeric G protein Gα and Gβγ subunits, both of which interact with downstream effectors to regulate cell function. Gβγ signaling has been implicated in the pathophysiology of several diseases, suggesting that Gβγ could be an important pharmaceutical target. Previously, we used a combination of virtual and manual screening to find small molecules that bind to a protein-protein interaction "hot spot" on Gβγ and block regulation of physiological effectors. One of the most potent and effective compounds from this screen was selenocystamine. In this study, we investigated the mechanism of action of selenocystamine and found that selenocysteamine forms a covalent complex with Gβγ by a reversible redox mechanism. Mass spectrometry and site-directed mutagenesis suggest that selenocysteamine preferentially modifies GβCys204, but also a second undefined site. The high potency of selenocystamine in Gβγ inhibition seems to arise from both high reactivity of the diselenide group and binding to a specific site on Gβ. Using structural information about the "hot spot," we developed a strategy to selectively target redox reversible compounds to a specific site on Gβγ using peptide carriers such as SIGCAFKILGY(-cysteamine) [SIGC(-cysteamine)]. Mass spectrometry and site-directed mutagenesis indicate that SIGC(-cysteamine) specifically and efficiently leads to cysteamine (half-cystamine) modification of a single site on Gβ, likely GβCys204, and inhibits Gβγ more than a hundred times more potently than cystamine. These data support the concept that covalent modifiers can be specifically targeted to the Gβγ "hot spot" through rational incorporation into molecules that noncovalently bind to Gβγ.
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Affiliation(s)
- Axel L Dessal
- Department of Pharmacology and Physiology, University of Rochester, School of Medicine and Dentistry, Rochester, New York, USA
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42
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Uncoupling the coupled calcium and zinc dyshomeostasis in cardiac myocytes and mitochondria seen in aldosteronism. J Cardiovasc Pharmacol 2010; 55:248-54. [PMID: 20051880 DOI: 10.1097/fjc.0b013e3181cf0090] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Intracellular [Ca2+]i overloading in cardiomyocytes is a fundamental pathogenic event associated with chronic aldosterone/salt treatment (ALDOST) and accounts for an induction of oxidative stress that leads to necrotic cell death and consequent myocardial scarring. This prooxidant response to Ca2+ overloading in cardiac myocytes and mitochondria is intrinsically coupled to simultaneous increased Zn2+ entry serving as an antioxidant. Herein, we investigated whether Ca2+ and Zn2+ dyshomeostasis and prooxidant to antioxidant dysequilibrium seen at 4 weeks, the pathologic stage of ALDOST, could be uncoupled in favor of antioxidants, using cotreatment with a ZnSO4 supplement; pyrrolidine dithiocarbamate (PDTC), a Zn2+ ionophore; or ZnSO4 in combination with amlodipine (Amlod), a Ca2+ channel blocker. We monitored and compared responses in cardiomyocyte free [Ca2+]i and [Zn2+]i together with biomarkers of oxidative stress in cardiac myocytes and mitochondria. At week 4 of ALDOST and compared with controls, we found (1) an elevation in [Ca2+]i coupled with [Zn2+]i and (2) increased mitochondrial H2O2 production and increased mitochondrial and cardiac 8-isoprostane levels. Cotreatment with the ZnSO4 supplement alone, PDTC, or ZnSO4+Amlod augmented the rise in cardiomyocyte [Zn2+]i beyond that seen with ALDOST alone, whereas attenuating the rise in [Ca2+]i, which together served to reduce oxidative stress. Thus, a coupled dyshomeostasis of intracellular Ca2+ and Zn2+ was demonstrated in cardiac myocytes and mitochondria during 4-week ALDOST, where prooxidants overwhelm antioxidant defenses. This intrinsically coupled Ca2+ and Zn2+ dyshomeostasis could be uncoupled in favor of antioxidant defenses by selectively increasing free [Zn2+]i and/or reducing [Ca2+]i using cotreatment with ZnSO4 or PDTC alone or ZnSO4+Amlod in combination.
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Pankratov AN, Bychkov NA, Tsivileva OM. Interaction of L-cysteine with selenious and selenic acids: A study by the density functional theory method. J STRUCT CHEM+ 2010. [DOI: 10.1007/s10947-010-0002-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Affiliation(s)
- Wolfgang Maret
- Department of Preventive Medicine & Community Health, The University of Texas Medical Branch, Galveston, Texas 77555-1109, USA.
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Maret W. Fluorescent probes for the structure and function of metallothionein. J Chromatogr B Analyt Technol Biomed Life Sci 2009; 877:3378-83. [PMID: 19589737 DOI: 10.1016/j.jchromb.2009.06.014] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2009] [Revised: 06/05/2009] [Accepted: 06/09/2009] [Indexed: 10/20/2022]
Abstract
Fluorescence methods have been instrumental in demonstrating that the structure of human metallothionein in vivo depends on the availability of metal ions and the redox environment. Differential chemical modifications of its cysteine thiols with fluorescent probes allowed determination of three states: metallothionein (zinc-bound thiolate), thionein (free thiols), and thionin (disulfides). Interrogation of its zinc-binding properties with fluorescent chelating agents revealed that the affinities for the seven zinc ions vary over four orders of magnitude. Attachment of fluorescent labels generated metallothionein FRET (fluorescence resonance energy transfer) sensors for investigating its structure and function in living cells.
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Affiliation(s)
- Wolfgang Maret
- Departments of Preventive Medicine & Community Health and Anesthesiology, The University of Texas Medical Branch, Galveston, TX 77555-1109, USA.
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Larabee JL, Hocker JR, Hanas JS. Mechanisms of inhibition of zinc-finger transcription factors by selenium compounds ebselen and selenite. J Inorg Biochem 2009; 103:419-26. [PMID: 19167089 DOI: 10.1016/j.jinorgbio.2008.12.007] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2008] [Revised: 12/11/2008] [Accepted: 12/12/2008] [Indexed: 11/21/2022]
Abstract
The anti-inflammatory selenium compounds, ebselen (2-phenyl-1,2-benzisoselenazol-3[2H]-one) and selenite, were found to alter the DNA binding mechanisms and structures of cysteine-rich zinc-finger transcription factors. As assayed by DNase I protection, DNA binding by TFIIIA (transcription factor IIIA, prototypical Cys(2)His(2) zinc finger protein), was inhibited by micromolar amounts of ebselen. In a gel shift assay, ebselen inhibited the Cys(2)His(2) zinc finger-containing DNA binding domain (DBD) of the NF-kappaB mediated transcription factor Sp1. Ebselen also inhibited DNA binding by the p50 subunit of the pro-inflammatory Cys-containing NF-kappaB transcription factor. Electrospray ionization mass spectrometry (ESI-MS) was utilized to elucidate mechanisms of chemical interaction between ebselen and a zinc-bound Cys(2)His(2) zinc finger polypeptide modeled after the third finger of Sp1 (Sp1-3). Exposing Sp1-3 to micromolar amounts of ebselen resulted in Zn(2+) release from this peptide and the formation of a disulfide bond by oxidation of zinc finger SH groups, the likely mechanism for DNA binding inhibition. Selenite was shown by ESI-MS to also eject zinc from Sp1-3 as well as induce disulfide bond formation through SH oxidation. The selenite-dependent inhibition/oxidation mechanism differed from that of ebselen by inducing the formation of a stable selenotrisulfide bond. Selenite-induced selenotrisulfide formation was dependent upon the structure of the Cys(2)His(2) zinc finger as alteration in the finger structure enhanced this reaction as well as selenite-dependent zinc release. Ebselen and selenite-dependent inhibition/oxidation of Cys-rich zinc finger proteins, with concomitant release of zinc and finger structural changes, points to mechanisms at the atomic and protein level for selenium-induced alterations in Cys-rich proteins, and possible amelioration of certain inflammatory, neurodegenerative, and oncogenic responses.
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Affiliation(s)
- Jason L Larabee
- Department of Biochemistry and Molecular Biology, University of Oklahoma College of Medicine, 940 Stanton Young Blvd., Room 939, Oklahoma City, OK 73104, United States
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47
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Molecular aspects of human cellular zinc homeostasis: redox control of zinc potentials and zinc signals. Biometals 2009; 22:149-57. [DOI: 10.1007/s10534-008-9186-z] [Citation(s) in RCA: 193] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2008] [Accepted: 12/07/2008] [Indexed: 11/27/2022]
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48
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Bell SG, Vallee BL. The Metallothionein/Thionein System: An Oxidoreductive Metabolic Zinc Link. Chembiochem 2009; 10:55-62. [DOI: 10.1002/cbic.200800511] [Citation(s) in RCA: 164] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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49
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Mecklenburg S, Collins CA, Döring M, Burkholz T, Abbas M, Fry FH, Pourzand C, Jacob C. The Design of Multifunctional Antioxidants Against the Damaging Ingredients of Oxidative Stress. PHOSPHORUS SULFUR 2008. [DOI: 10.1080/10426500801898200] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Susanne Mecklenburg
- a Division of Bioorganic Chemistry, School of Pharmacy , Saarland University , Saarbruecken, D-66041, Germany
| | - Catriona A. Collins
- b School of Biosciences , University of Exeter , Exeter, EX4 4 QD, United Kingdom
| | - Mandy Döring
- a Division of Bioorganic Chemistry, School of Pharmacy , Saarland University , Saarbruecken, D-66041, Germany
| | - Torsten Burkholz
- a Division of Bioorganic Chemistry, School of Pharmacy , Saarland University , Saarbruecken, D-66041, Germany
| | - Muhammad Abbas
- a Division of Bioorganic Chemistry, School of Pharmacy , Saarland University , Saarbruecken, D-66041, Germany
| | - Fiona H. Fry
- b School of Biosciences , University of Exeter , Exeter, EX4 4 QD, United Kingdom
| | - Charareh Pourzand
- c Department of Pharmacy and Pharmacology , University of Bath , Claverton Down, Bath, BA2 7AY, United Kingdom
| | - Claus Jacob
- a Division of Bioorganic Chemistry, School of Pharmacy , Saarland University , Saarbruecken, D-66041, Germany
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Yang J, Welby JL, Meyerhoff ME. Generic nitric oxide (NO) generating surface by immobilizing organoselenium species via layer-by-layer assembly. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:10265-72. [PMID: 18710268 PMCID: PMC2824255 DOI: 10.1021/la801466e] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
A universal nitric oxide (NO) generating surface is assembled via Layer-by-Layer (LbL) deposition of sodium alginate (Alg) and organoselenium modified polyethyleneimine (SePEI) on quartz and polymeric substrates. The immobilized SePEI species is capable of catalytically decomposing S-nitrosothiol species (RSNO) to NO in the presence of thiol reducing agents (e.g., glutathione, cysteine, etc.). The stepwise buildup of the multilayer films is monitored by UV-vis spectroscopy, SEM and surface contact angle measurements. X-ray photoelectron spectroscopy is used to study the stoichiometry between the polyanion and polycation, and also the presence of Se in the catalytic LbL film. A reductive annealing process is necessary to improve the stability of freshly coated multilayer films via chain rearrangement. Chemiluminescence measurements illustrate the ability of the LbL films to generate NO from S-nitrosoglutathione (GSNO) in the presence of glutathione (GSH). Enhanced NO fluxes can be achieved by increasing the number of catalytic (SePEI/Alg) bilayers coated on the substrates. Nitric oxide generation is observed even after prolonged contact with sheep whole blood. Preliminary applications of this LbL on silicone rubber tubings and polyurethane catheters reveal similar NO generation behavior from these biomedical grade polymeric substrates.
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Affiliation(s)
- Jun Yang
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan, 48109-1055
| | - Jenna L. Welby
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan, 48109-1055
| | - Mark E. Meyerhoff
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan, 48109-1055
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