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Zhao Z. Hydroxyl radical generations form the physiologically relevant Fenton-like reactions. Free Radic Biol Med 2023; 208:510-515. [PMID: 37717792 DOI: 10.1016/j.freeradbiomed.2023.09.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Revised: 08/23/2023] [Accepted: 09/14/2023] [Indexed: 09/19/2023]
Abstract
Iron(II) species can participate in the Fenton and Fenton-like reactions to generate the hydroxyl radical that can oxidatively damage biomolecules and induce oxidative stress in biological systems. Many diseases, including neurodegeneration, cardiovascular disease and cancer, are associated with oxidative stress. However, it is proposed recently that hydroxyl radical would not be generated from the Fenton reaction under physiological conditions and thus would not cause oxidative stress in biological systems. This proposal may cause confusion for understanding oxidative stress and can also have impact on therapeutic strategies for the diseases associated with oxidative stress. In this Mini-review, the up-to-date convincing evidences of hydroxyl radical generation from the physiologically relevant Fenton-like reactions of the iron(II) complexes with physiological ligands in human blood plasma, including histidine, citrate and phosphate, are succinctly reviewed. The oxidative damages caused by hydroxyl radical to biomolecules and cells are briefly summarized. These findings strongly challenge the above proposal.
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Affiliation(s)
- Zhongwei Zhao
- School of Pharmaceutical Sciences, Capital Medical University, Beijing, 100069, China; College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, 100029, China.
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2
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Poore AT, Zuercher EC, Bury G, Whitesell C, Nguyen CC, Pushkar YN, Tian S. Revisit the E2 Domain of Amyloid Precursor Protein: Ferroxidase, Superoxide and Peroxynitrite Scavenging Activities. Inorg Chem 2023. [PMID: 37369063 DOI: 10.1021/acs.inorgchem.3c01336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/29/2023]
Abstract
Amyloid precursor protein (APP) is the biological precursor of β-amyloids, a known histopathological hallmark associated with Alzheimer's disease (AD). The function of APP is of great interest yet remains elusive. One of the extracellular domains of APP, the E2 domain, has been proposed to possess ferroxidase activity and affect neuronal iron homeostasis. However, contradicting evidence has been reported, and its precise role remains inconclusive. Here, we studied the Cu-binding site of the E2 domain using extended X-ray absorption fine structure (EXAFS), UV-vis, and electron paramagnetic resonance (EPR) and discovered that a new labile water ligand coordinates to the Cu(II) cofactor in addition to the four known histidines. We explored the proposed ferroxidase activity of the Cu(II)-E2 domain through reactions with ferrous iron and observed single-turnover ferrous oxidation activity with a rate up to 1.0 × 102 M-1 s-1. Cu(I)-E2 reacted with molecular oxygen at a rate of only 5.3 M-1 s-1, which would restrict any potential multiturnover ferroxidase activity to this slow rate and prevents observation of activity under multiturnover conditions. The positive electrostatic potential surface of the protein indicates possible reactivity with negatively charged small substrates such as superoxide radicals (O2•-) and peroxynitrite (ONOO-) that are major contributors to the oxidative stress prevalent in the extracellular environment. Our assays showed that Cu(I)-E2 can remove O2•- at a rate of 1.6 × 105 M-1 s-1, which is slower than the rates of native SODs. However, the reaction between Cu(I)-E2 and ONOO- achieved a rate of 1.1 × 105 M-1 s-1, comparable to native ONOO- scavenger peroxiredoxins (105-107 M-1 s-1). Therefore, the E2 domain of APP can serve as an enzymatic site that may function as a ferroxidase under substrate-limiting conditions, a supplemental O2•- scavenger, and an ONOO- remover in the vicinity of the cellular iron efflux channel and protect neuron cells from reactive oxygen species (ROS) and reactive nitrogen species (RNS) damage.
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Affiliation(s)
- Andrew T Poore
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47906, United States
| | - Eli C Zuercher
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47906, United States
| | - Gabriel Bury
- Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, United States
| | - Caslyn Whitesell
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47906, United States
| | - Cuong C Nguyen
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47906, United States
| | - Yulia N Pushkar
- Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, United States
| | - Shiliang Tian
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47906, United States
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3
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Brawley H, Kreinbrink AC, Hierholzer JD, Vali SW, Lindahl PA. Labile Iron Pool of Isolated Escherichia coli Cytosol Likely Includes Fe-ATP and Fe-Citrate but not Fe-Glutathione or Aqueous Fe. J Am Chem Soc 2023; 145:2104-2117. [PMID: 36661842 PMCID: PMC9896560 DOI: 10.1021/jacs.2c06625] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Indexed: 01/21/2023]
Abstract
The existence of labile iron pools (LFePs) in biological systems has been recognized for decades, but their chemical composition remains uncertain. Here, the LFeP in cytosol from Escherichia coli was investigated. Mössbauer spectra of whole vs lysed cells indicated significant degradation of iron-sulfur clusters (ISCs), even using an unusually gentle lysis procedure; this demonstrated the fragility of ISCs. Moreover, the released iron contributed to the non-heme high-spin Fe(II) species in the cell, which likely included the LFeP. Cytosol batches isolated from cells grown with different levels of iron supplementation were passed through a 3 kDa cutoff membrane, and resulting flow-through-solutions (FTSs) were subjected to SEC-ICP-MS. Mössbauer spectroscopy was used to evaluate the oxidation states of standards. FTSs exhibited iron-detected peaks likely due to different forms of Fe-citrate and Fe-nucleotide triphosphate complexes. Fe-Glutathione (GSH) complexes were not detected using physiological concentrations of GSH mixed with either Fe(II) or Fe(III); Fe(II)-GSH was concluded not to be a significant component of the LFeP in E. coli under physiological conditions. Aqueous iron was also not present in significant concentrations in isolated cytosol and is unlikely a major component of the pool. Fe appeared to bind ATP more tightly than citrate, but ATP also hydrolyzed on the timescale of tens of hours. Isolated cytosol contained excess ligands that coordinated the added Fe(II) and Fe(III). The LFeP in healthy metabolically active cells is undoubtedly dominated by the Fe(II) state, but the LFeP is redox-active such that a fraction might be present as stable and soluble Fe(III) complexes especially under oxidatively stressed cellular conditions.
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Affiliation(s)
- Hayley
N. Brawley
- Department
of Chemistry, Texas A&M University, College Station, Texas 77843-3255, United States
| | - Alexia C. Kreinbrink
- Department
of Biochemistry and Biophysics, Texas A&M
University, College
Station, Texas 77843, United States
| | - Justin D. Hierholzer
- Department
of Biochemistry and Biophysics, Texas A&M
University, College
Station, Texas 77843, United States
| | - Shaik Waseem Vali
- Department
of Biochemistry and Biophysics, Texas A&M
University, College
Station, Texas 77843, United States
| | - Paul A. Lindahl
- Department
of Chemistry, Texas A&M University, College Station, Texas 77843-3255, United States
- Department
of Biochemistry and Biophysics, Texas A&M
University, College
Station, Texas 77843, United States
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4
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Qin M, Shao B, Lin L, Zhang ZQ, Sheng ZG, Qin L, Shao J, Zhu BZ. Molecular mechanism of the unusual biphasic effects of the natural compound hinokitiol on iron-induced cellular DNA damage. Free Radic Biol Med 2023; 194:163-171. [PMID: 36476568 DOI: 10.1016/j.freeradbiomed.2022.11.042] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/16/2022] [Revised: 11/19/2022] [Accepted: 11/29/2022] [Indexed: 12/12/2022]
Abstract
Hinokitiol is a natural monoterpene compound found in the heartwood of cupressaceous plants that have anticancer and anti-inflammatory properties. However, few studies have focused on its effect on iron-mediated cellular DNA damage. Here we show that hinokitiol exhibited unusual biphasic effects on iron-induced DNA damage in a molar ratio (hinokitiol/iron) dependent manner in HeLa cells. Under low ratios (<3:1), hinokitiol markedly enhanced DNA damage induced by Fe(II) or Fe(II)-H2O2; However, when the ratios increased over 3:1, the DNA damage was progressively inhibited. We found that the total cytoplasmic and nuclear iron concentration increased as the ratios of hinokitiol/iron increased. However, the cellular level of labile iron pool (LIP) only increased at ratios lower than 3, and the ROS generation is consistent with LIP change. Hinokitiol was found to interact with iron to form lipophilic hinokitiol-iron complexes with different stoichiometry and redox-activity by complementary applications of various analytical methods. Taken together, we propose that the enhancement of iron-induced cellular DNA damage by hinokitiol at low ratios (<3:1) was due to formation of lipophilic and redox-active iron complexes which facilitated cellular iron uptake and •OH production, while the inhibition at ratios higher than 3 was due to formation of redox-inactive iron complexes. These new findings will help us to design more effective drugs for the prevention and treatment of a series of iron-related diseases via regulating the two critical physicochemical factors (lipophilicity and redox activity of iron complexes) by simple natural compounds with iron-chelating properties.
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Affiliation(s)
- Miao Qin
- School of Public Health, Weifang Medical University, Weifang, Shandong, 261053, China; School of Public Health, Jining Medical University, Jining, Shandong, 272013, China; State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
| | - Bo Shao
- School of Public Health, Weifang Medical University, Weifang, Shandong, 261053, China; School of Public Health, Jining Medical University, Jining, Shandong, 272013, China; State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
| | - Li Lin
- School of Public Health, Weifang Medical University, Weifang, Shandong, 261053, China; School of Public Health, Jining Medical University, Jining, Shandong, 272013, China
| | - Zhao-Qiang Zhang
- School of Public Health, Jining Medical University, Jining, Shandong, 272013, China
| | - Zhi-Guo Sheng
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China; School of Resources and Environment, The University of Chinese Academy of Sciences, Beijing, China
| | - Li Qin
- School of Public Health, Zhejiang Chinese Medical University, Hangzhou, 310053, China
| | - Jie Shao
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China; School of Resources and Environment, The University of Chinese Academy of Sciences, Beijing, China
| | - Ben-Zhan Zhu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China; School of Resources and Environment, The University of Chinese Academy of Sciences, Beijing, China.
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5
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Pryshchepa O, Rafińska K, Gołębiowski A, Sugajski M, Sagandykova G, Madajski P, Buszewski B, Pomastowski P. Synthesis and physicochemical characterization of bovine lactoferrin supersaturated complex with iron (III) ions. Sci Rep 2022; 12:12695. [PMID: 35882883 DOI: 10.1038/s41598-022-15814-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2022] [Accepted: 06/29/2022] [Indexed: 01/23/2023] Open
Abstract
The aim of the study was to investigate the process of Fe3+ binding to bLTF. Moreover, the physicochemical characterization of the respective supersaturated complex was studied. The knowledge should be important for the description of processes that may take place in dairy products fortified with iron. Additionally, the synthesized complex can be utilized as a dietary supplement for the treatment of iron deficiency anemia (IDA). Finally, it was shown that formation of supersaturated iron-protein structures which include LTF often accompanies development of neurodegenerative diseases such as Alzheimer or Parkinson. Thus, the study can reveal some aspects of its pathogenesis process. The methodology of the investigation comprised the utilization of batch sorption study and applying Freundlich and Langmuir models. The complex also was characterized by numerous techniques: spectrometric (ICP-MS), spectroscopic (UV–Vis, ATR-FTIR), electron microscopy (TEM–EDX), SDS-PAGE. Based on obtained results the potential mechanisms of iron interaction with protein were described. Moreover, the molecular docking was applied to visualize possible metal binding sites. The respective complex contains ≈ 33.0 mg/g of iron which is nearly 50 Fe3+ per one protein molecule. The cytotoxicity of the obtained complex was evaluated by MTT reduction and LDH release assays on Caco-2 and nL929 cell lines.
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6
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Angoro B, Motshakeri M, Hemmaway C, Svirskis D, Sharma M. Non-transferrin bound iron. Clin Chim Acta 2022; 531:157-167. [DOI: 10.1016/j.cca.2022.04.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Revised: 04/04/2022] [Accepted: 04/05/2022] [Indexed: 12/31/2022]
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7
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Roth-Walter F. Iron-Deficiency in Atopic Diseases: Innate Immune Priming by Allergens and Siderophores. Front Allergy 2022; 3:859922. [PMID: 35769558 PMCID: PMC9234869 DOI: 10.3389/falgy.2022.859922] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2022] [Accepted: 03/03/2022] [Indexed: 12/12/2022] Open
Abstract
Although iron is one of the most abundant elements on earth, about a third of the world's population are affected by iron deficiency. Main drivers of iron deficiency are beside the chronic lack of dietary iron, a hampered uptake machinery as a result of immune activation. Macrophages are the principal cells distributing iron in the human body with their iron restriction skewing these cells to a more pro-inflammatory state. Consequently, iron deficiency has a pronounced impact on immune cells, favoring Th2-cell survival, immunoglobulin class switching and primes mast cells for degranulation. Iron deficiency during pregnancy increases the risk of atopic diseases in children, while both children and adults with allergy are more likely to have anemia. In contrast, an improved iron status seems to protect against allergy development. Here, the most important interconnections between iron metabolism and allergies, the effect of iron deprivation on distinct immune cell types, as well as the pathophysiology in atopic diseases are summarized. Although the main focus will be humans, we also compare them with innate defense and iron sequestration strategies of microbes, given, particularly, attention to catechol-siderophores. Similarly, the defense and nutritional strategies in plants with their inducible systemic acquired resistance by salicylic acid, which further leads to synthesis of flavonoids as well as pathogenesis-related proteins, will be elaborated as both are very important for understanding the etiology of allergic diseases. Many allergens, such as lipocalins and the pathogenesis-related proteins, are able to bind iron and either deprive or supply iron to immune cells. Thus, a locally induced iron deficiency will result in immune activation and allergic sensitization. However, the same proteins such as the whey protein beta-lactoglobulin can also transport this precious micronutrient to the host immune cells (holoBLG) and hinder their activation, promoting tolerance and protecting against allergy. Since 2019, several clinical trials have also been conducted in allergic subjects using holoBLG as a food for special medical purposes, leading to a reduction in the allergic symptom burden. Supplementation with nutrient-carrying lipocalin proteins can circumvent the mucosal block and nourish selectively immune cells, therefore representing a new dietary and causative approach to compensate for functional iron deficiency in allergy sufferers.
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Affiliation(s)
- Franziska Roth-Walter
- Comparative Medicine, The Interuniversity Messerli Research Institute, University of Veterinary Medicine Vienna, Medical University Vienna, University of Vienna, Vienna, Austria
- Institute of Pathophysiology and Allergy Research, Center of Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
- *Correspondence: Franziska Roth-Walter ;
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8
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Abstract
In healthy individuals, virtually all blood plasma iron is bound by transferrin. However, in several diseases and clinical conditions, hazardous non-transferrin-bound iron (NTBI) species occur. NTBI represents a potentially toxic iron form, being a direct cause of oxidative stress in the circulating compartment and tissue iron loading. The accumulation of these species can cause cellular damage in several organs, namely, the liver, spleen, and heart. Despite its pathophysiological relevance, the chemical nature of NTBI remains elusive. This has precluded its use as a clinical biochemical marker and the development of targeted therapies. Herein, we make a critical assessment of the current knowledge of NTBI speciation. The currently accepted hypotheses suggest that NTBI is mostly iron bound to citric acid and iron bound to serum albumin, but the chemistry of this system remains fuzzy. We explore the complex chemistry of iron complexation by citric acid and its implications towards NTBI reactivity. Further, the ability of albumin to bind iron is revised and the role of protein post-translational modifications on iron binding is discussed. The characterization of the NTBI species structure may be the starting point for the development of a standardized analytical assay, the better understanding of these species’ reactivity or the identification of NTBI uptake mechanisms by different cell types, and finally, to the development of new therapies.
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9
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Morgado L, Salgueiro CA. Elucidation of complex respiratory chains: a straightforward strategy to monitor electron transfer between cytochromes. Metallomics 2022; 14:6539350. [DOI: 10.1093/mtomcs/mfac012] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Accepted: 02/17/2022] [Indexed: 11/12/2022]
Abstract
Abstract
Cytochromes are electron transfer proteins essential in various biological systems, playing crucial roles in the respiratory chains of bacteria. These proteins are particularly abundant in electrogenic microorganisms and are responsible for the efficient delivery of electrons to the cells’ exterior. The capability of sending electron outside the cells open new avenues to be explored for emerging biotechnological applications in bioremediation, microbial electrosynthesis and bioenergy fields. To develop these applications, it is critical to identify the different redox partners and elucidate the stepwise electron transfer along the respiratory paths. However, investigating direct electron transfer events between proteins with identical features in nearly all spectroscopic techniques is extremely challenging. NMR spectroscopy offers the possibility to overcome this difficulty by analysing the alterations of the spectral signatures of each protein caused by electron exchange events. The uncrowded NMR spectral regions containing the heme resonances of the cytochromes display unique and distinct signatures in the reduced and oxidized states, which can be explored to monitor electron transfer within the redox complex. In this study, we present a strategy for a fast and straightforward monitorization of electron transfer between c-type cytochromes, using as model a triheme periplasmic cytochrome (PpcA) and a membrane associated monoheme cytochrome (OmcF) from the electrogenic bacterium Geobacter sulfurreducens. The comparison between the 1D 1H NMR spectra obtained for samples containing the two cytochromes and for samples containing the individual proteins clearly demonstrated a unidirectional electron transfer within the redox complex. This strategy provides a simple and straightforward means to elucidate complex biologic respiratory electron transfer chains.
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Affiliation(s)
- Leonor Morgado
- Associate Laboratory i4HB—Institute for Health and Bioeconomy, NOVA School of Science and Technology, NOVA University Lisbon, 2819-516 Caparica, Portugal
- UCIBIO—Applied Molecular Biosciences Unit, Department of Chemistry, NOVA School of Science and Technology, NOVA University Lisbon, 2819-516 Caparica, Portugal
| | - Carlos A Salgueiro
- Associate Laboratory i4HB—Institute for Health and Bioeconomy, NOVA School of Science and Technology, NOVA University Lisbon, 2819-516 Caparica, Portugal
- UCIBIO—Applied Molecular Biosciences Unit, Department of Chemistry, NOVA School of Science and Technology, NOVA University Lisbon, 2819-516 Caparica, Portugal
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10
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Selyutina OY, Kononova PA, Koshman VE, Shelepova EA, Azad MG, Afroz R, Dharmasivam M, Bernhardt PV, Polyakov NE, Richardson DR. Ascorbate-and iron-driven redox activity of Dp44mT and emodin facilitates peroxidation of micelles and bicelles. Biochim Biophys Acta Gen Subj 2021; 1866:130078. [PMID: 34974127 DOI: 10.1016/j.bbagen.2021.130078] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 12/10/2021] [Accepted: 12/20/2021] [Indexed: 12/28/2022]
Abstract
BACKGROUND Iron (Fe)-induced oxidative stress leads to reactive oxygen species that damage biomembranes, with this mechanism being involved in the activity of some anti-cancer chemotherapeutics. METHODS Herein, we compared the effect of Fe complexes of the ligand, di-2-pyridylketone 4,4-dimethyl-3-thiosemicarbazone (Dp44mT), or the potential ligand, Emodin, on lipid peroxidation in cell membrane models (micelles and bicelles). These studies were performed in the presence of hydrogen peroxide (H2O2) and the absence or presence of ascorbate. RESULTS In the absence of ascorbate, Fe(II)/Emodin mixtures incubated with H2O2 demonstrated slight pro-oxidant properties on micelles versus Fe(II) alone, while the Fe(III)-Dp44mT complex exhibited marked antioxidant properties. Examining more physiologically relevant phospholipid-containing bicelles, the Fe(II)- and Fe(III)-Dp44mT complexes demonstrated antioxidant activity without ascorbate. Upon adding ascorbate, there was a significant increase in the peroxidation of micelles and bicelles in the presence of unchelated Fe(II) and H2O2. The addition of ascorbate to Fe(III)-Dp44mT substantially increased the peroxidation of micelles and bicelles, with the Fe(III)-Dp44mT complex being reduced by ascorbate to the Fe(II) state, explaining the increased reactivity. Electron paramagnetic resonance spectroscopy demonstrated ascorbyl radical anion generation after mixing ascorbate and Emodin, with signal intensity being enhanced by H2O2. This finding suggested Emodin semiquinone radical formation that could play a role in its reactivity via ascorbate-driven redox cycling. Examining cultured melanoma cells in vitro, ascorbate at pharmacological levels enhanced the anti-proliferative activity of Dp44mT and Emodin. CONCLUSIONS AND GENERAL SIGNIFICANCE Ascorbate-driven redox cycling of Dp44mT and Emodin promotes their anti-proliferative activity.
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Affiliation(s)
- O Yu Selyutina
- Institute of Chemical Kinetics and Combustion, Institutskaya St., 3, 630090 Novosibirsk, Russia; Institute of Solid State Chemistry and Mechanochemistry, Kutateladze St., 18, 630128 Novosibirsk, Russia.
| | - P A Kononova
- Institute of Chemical Kinetics and Combustion, Institutskaya St., 3, 630090 Novosibirsk, Russia
| | - V E Koshman
- Institute of Chemical Kinetics and Combustion, Institutskaya St., 3, 630090 Novosibirsk, Russia
| | - E A Shelepova
- Institute of Chemical Kinetics and Combustion, Institutskaya St., 3, 630090 Novosibirsk, Russia
| | - M Gholam Azad
- Centre for Cancer Cell Biology and Drug Discovery, Griffith Institute for Drug Discovery, Griffith University, Nathan, Brisbane, Queensland 4111, Australia
| | - R Afroz
- Centre for Cancer Cell Biology and Drug Discovery, Griffith Institute for Drug Discovery, Griffith University, Nathan, Brisbane, Queensland 4111, Australia
| | - M Dharmasivam
- Centre for Cancer Cell Biology and Drug Discovery, Griffith Institute for Drug Discovery, Griffith University, Nathan, Brisbane, Queensland 4111, Australia
| | - P V Bernhardt
- Department of Chemistry, University of Queensland, St. Lucia, Brisbane, Queensland 4072, Australia
| | - N E Polyakov
- Institute of Chemical Kinetics and Combustion, Institutskaya St., 3, 630090 Novosibirsk, Russia; Institute of Solid State Chemistry and Mechanochemistry, Kutateladze St., 18, 630128 Novosibirsk, Russia
| | - D R Richardson
- Centre for Cancer Cell Biology and Drug Discovery, Griffith Institute for Drug Discovery, Griffith University, Nathan, Brisbane, Queensland 4111, Australia; Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya 466-8550, Japan.
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11
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Joshi K, Chan CH, Bond DR. Geobacter sulfurreducens inner membrane cytochrome CbcBA controls electron transfer and growth yield near the energetic limit of respiration. Mol Microbiol 2021; 116:1124-1139. [PMID: 34423503 DOI: 10.1111/mmi.14801] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Revised: 08/18/2021] [Accepted: 08/19/2021] [Indexed: 12/24/2022]
Abstract
Geobacter sulfurreducens utilizes extracellular electron acceptors such as Mn(IV), Fe(III), syntrophic partners, and electrodes that vary from +0.4 to -0.3 V versus standard hydrogen electrode (SHE), representing a potential energy span that should require a highly branched electron transfer chain. Here we describe CbcBA, a bc-type cytochrome essential near the thermodynamic limit of respiration when acetate is the electron donor. Mutants-lacking cbcBA ceased Fe(III) reduction at -0.21 V versus SHE, could not transfer electrons to electrodes between -0.21 and -0.28 V, and could not reduce the final 10%-35% of Fe(III) minerals. As redox potential decreased during Fe(III) reduction, cbcBA was induced with the aid of the regulator BccR to become one of the most highly expressed genes in G. sulfurreducens. Growth yield (CFU/mM Fe(II)) was 112% of WT in ∆cbcBA, and deletion of cbcL (an unrelated bc-cytochrome essential near -0.15 V) in ΔcbcBA increased yield to 220%. Together with ImcH, which is required at high redox potentials, CbcBA represents a third cytoplasmic membrane oxidoreductase in G. sulfurreducens. This expanding list shows how metal-reducing bacteria may constantly sense redox potential to adjust growth efficiency in changing environments.
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Affiliation(s)
- Komal Joshi
- The BioTechnology Institute, University of Minnesota Twin Cities, Minneapolis, Minnesota, USA.,Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota Twin Cities, Minneapolis, Minnesota, USA
| | - Chi Ho Chan
- The BioTechnology Institute, University of Minnesota Twin Cities, Minneapolis, Minnesota, USA
| | - Daniel R Bond
- The BioTechnology Institute, University of Minnesota Twin Cities, Minneapolis, Minnesota, USA.,Department of Plant and Microbial Biology, University of Minnesota Twin Cities, Minneapolis, Minnesota, USA
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12
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Abstract
Recent publications have suggested that oxidative DNA damage mediated by hydroxyl radical (˙OH) is unimportant in vivo, and that carbonate anion radical (CO3˙-) plays the key role. We examine these claims and summarize the evidence that ˙OH does play a key role as an important member of the reactive oxygen species (ROS) in vivo.
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Affiliation(s)
- Barry Halliwell
- Department of Biochemistry, National University of Singapore, Centre for Life Sciences, #05-01A, 28 Medical Drive, 117456, Singapore.
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13
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Shao B, Mao L, Tang M, Yan ZY, Shao J, Huang CH, Sheng ZG, Zhu BZ. Caffeic Acid Phenyl Ester (CAPE) Protects against Iron-Mediated Cellular DNA Damage through Its Strong Iron-Binding Ability and High Lipophilicity. Antioxidants (Basel) 2021; 10:antiox10050798. [PMID: 34069954 PMCID: PMC8157578 DOI: 10.3390/antiox10050798] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Revised: 05/08/2021] [Accepted: 05/11/2021] [Indexed: 12/25/2022] Open
Abstract
Caffeic acid phenethyl ester (CAPE) and its structurally-related caffeic acid (CA), ferulic acid (FA) and ethyl ferulate (EF) are constituents of honeybee propolis that have important pharmacological activities. This study found that CAPE—but not CA, FA, and EF—could effectively prevent cellular DNA damage induced by overloaded iron through decreasing the labile iron pool (LIP) levels in HeLa cells. Interestingly, CAPE was found to be more effective than CA in protecting against plasmid DNA damage induced by Fe(II)–H2O2 or Fe(III)–citrate–ascorbate-H2O2 via the inhibition of hydroxyl radical (•OH) production. We further provided more direct and unequivocal experimental evidences for the formation of inactive CAPE/CA–iron complexes. CAPE was found to have a stronger iron-binding ability and a much higher lipophilicity than CA. Taken together, we propose that the esterification of the carboxylic moiety with phenethyl significantly enhanced the iron-binding ability and lipophilicity of CAPE, which is also responsible for its potent protection against iron-mediated cellular DNA damage. A study on the iron coordination mechanism of such natural polyphenol antioxidants will help to design more effective antioxidants for the treatment and prevention of diseases caused by metal-induced oxidative stress, as well as help to understand the structure–activity relationships of these compounds.
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Affiliation(s)
- Bo Shao
- Department of Public Health, Jining Medical University, Jining 272067, China;
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, The Chinese Academy of Sciences, Beijing 100085, China; (M.T.); (Z.-Y.Y.); (J.S.); (C.-H.H.); (Z.-G.S.)
| | - Li Mao
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, The Chinese Academy of Sciences, Beijing 100085, China; (M.T.); (Z.-Y.Y.); (J.S.); (C.-H.H.); (Z.-G.S.)
- University of Chinese Academy of Sciences, Beijing 100085, China
- Correspondence: (L.M.); (B.-Z.Z.); Tel.: +86-10-62849030 (B.-Z.Z.)
| | - Miao Tang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, The Chinese Academy of Sciences, Beijing 100085, China; (M.T.); (Z.-Y.Y.); (J.S.); (C.-H.H.); (Z.-G.S.)
- University of Chinese Academy of Sciences, Beijing 100085, China
| | - Zhu-Ying Yan
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, The Chinese Academy of Sciences, Beijing 100085, China; (M.T.); (Z.-Y.Y.); (J.S.); (C.-H.H.); (Z.-G.S.)
- University of Chinese Academy of Sciences, Beijing 100085, China
| | - Jie Shao
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, The Chinese Academy of Sciences, Beijing 100085, China; (M.T.); (Z.-Y.Y.); (J.S.); (C.-H.H.); (Z.-G.S.)
- University of Chinese Academy of Sciences, Beijing 100085, China
| | - Chun-Hua Huang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, The Chinese Academy of Sciences, Beijing 100085, China; (M.T.); (Z.-Y.Y.); (J.S.); (C.-H.H.); (Z.-G.S.)
- University of Chinese Academy of Sciences, Beijing 100085, China
| | - Zhi-Guo Sheng
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, The Chinese Academy of Sciences, Beijing 100085, China; (M.T.); (Z.-Y.Y.); (J.S.); (C.-H.H.); (Z.-G.S.)
- University of Chinese Academy of Sciences, Beijing 100085, China
| | - Ben-Zhan Zhu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, The Chinese Academy of Sciences, Beijing 100085, China; (M.T.); (Z.-Y.Y.); (J.S.); (C.-H.H.); (Z.-G.S.)
- University of Chinese Academy of Sciences, Beijing 100085, China
- Joint Institute for Environmental Science, Research Center for Eco-Environmental Sciences and Hong Kong Baptist University, Beijing 100085/Hong Kong 999077, China
- Correspondence: (L.M.); (B.-Z.Z.); Tel.: +86-10-62849030 (B.-Z.Z.)
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Senan AM, Yin B, Zhang Y, Nasiru MM, Lyu YM, Umair M, Bhat JA, Zhang S, Liu L. Efficient and selective catalytic hydroxylation of unsaturated plant oils: a novel method for producing anti-pathogens. BMC Chem 2021; 15:20. [PMID: 33781309 PMCID: PMC8008645 DOI: 10.1186/s13065-021-00748-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2020] [Accepted: 03/17/2021] [Indexed: 12/31/2022] Open
Abstract
With the increasing demand for antimicrobial agents and the spread of antibiotic resistance in pathogens, the exploitation of plant oils to partly replace antibiotic emerges as an important source of fine chemicals, functional food utility and pharmaceutical industries. This work introduces a novel catalytic method of plant oils hydroxylation by Fe(III) citrate monohydrate (Fe3+-cit.)/Na2S2O8 catalyst. Methyl (9Z,12Z)-octadecadienoate (ML) was selected as an example of vegetable oils hydroxylation to its hydroxy-conjugated derivatives (CHML) in the presence of a new complex of Fe(II)-species. Methyl 9,12-di-hydroxyoctadecanoate 1, methyl-9-hydroxyoctadecanoate 2 and methyl (10E,12E)-octadecanoate 3 mixtures is produced under optimized condition with oxygen balloon. The specific hydroxylation activity was lower in the case of using Na2S2O8 alone as a catalyst. A chemical reaction has shown the main process converted of plantoils hydroxylation and (+ 16 Da) of OH- attached at the methyl linoleate (ML-OH). HPLC and MALDI-ToF-mass spectrometry were employed for determining the obtained products. It was found that adding oxidizing agents (Na2S2O8) to Fe3+ in the MeCN mixture with H2O would generate the new complex of Fe(II)-species, which improves the C-H activation. Hence, the present study demonstrated a new functional method for better usage of vegetable oils.Producing conjugated hydroxy-fatty acids/esters with better antipathogenic properties. CHML used in food industry, It has a potential pathway to food safety and packaging process with good advantages, fundamental to microbial resistance. Lastly, our findings showed that biological monitoring of CHML-minimum inhibitory concentration (MIC) inhibited growth of various gram-positive and gram-negative bacteria in vitro study. The produced CHML profiles were comparable to the corresponding to previousstudies and showed improved the inhibition efficiency over the respective kanamycin derivatives.![]()
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Affiliation(s)
- Ahmed M Senan
- Glycomics and Glycan Bioengineering Research Center School of Food Science and Technology, Nanjing Agricultural University, Nanjing, 210095, People's Republic of China. .,Department of Pharmaceutical Sciences, College of Pharmacy, University of Tennessee Health Science Center, Memphis, TN, 38163, USA.
| | - Binru Yin
- Glycomics and Glycan Bioengineering Research Center School of Food Science and Technology, Nanjing Agricultural University, Nanjing, 210095, People's Republic of China
| | - Yaoyao Zhang
- Glycomics and Glycan Bioengineering Research Center School of Food Science and Technology, Nanjing Agricultural University, Nanjing, 210095, People's Republic of China
| | - Mustapha M Nasiru
- Glycomics and Glycan Bioengineering Research Center School of Food Science and Technology, Nanjing Agricultural University, Nanjing, 210095, People's Republic of China
| | - Yong-Mei Lyu
- Glycomics and Glycan Bioengineering Research Center School of Food Science and Technology, Nanjing Agricultural University, Nanjing, 210095, People's Republic of China
| | - Muhammad Umair
- Glycomics and Glycan Bioengineering Research Center School of Food Science and Technology, Nanjing Agricultural University, Nanjing, 210095, People's Republic of China
| | - Javaid A Bhat
- Glycomics and Glycan Bioengineering Research Center School of Food Science and Technology, Nanjing Agricultural University, Nanjing, 210095, People's Republic of China
| | - Sicheng Zhang
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Tennessee Health Science Center, Memphis, TN, 38163, USA
| | - Li Liu
- Glycomics and Glycan Bioengineering Research Center School of Food Science and Technology, Nanjing Agricultural University, Nanjing, 210095, People's Republic of China. .,Department of Pharmaceutical Sciences, College of Pharmacy, University of Tennessee Health Science Center, Memphis, TN, 38163, USA.
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Schwabe R, Senges CHR, Bandow JE, Heine T, Lehmann H, Wiche O, Schlömann M, Levicán G, Tischler D. Cultivation dependent formation of siderophores by Gordonia rubripertincta CWB2. Microbiol Res 2020; 238:126481. [DOI: 10.1016/j.micres.2020.126481] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Revised: 03/31/2020] [Accepted: 04/15/2020] [Indexed: 11/24/2022]
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Costa WRP, Souza RAC, Deflon VM, Oliveira CG. Preparation, structural characterization, voltammetry and Hirshfeld surface analysis of homoleptic iron(III) thiosemicarbazone complexes. TRANSIT METAL CHEM 2020; 45:511-21. [DOI: 10.1007/s11243-020-00404-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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17
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Kontoghiorghes GJ, Kolnagou A, Kontoghiorghe CN, Mourouzidis L, Timoshnikov VA, Polyakov NE. Trying to Solve the Puzzle of the Interaction of Ascorbic Acid and Iron: Redox, Chelation and Therapeutic Implications. Medicines (Basel) 2020; 7:E45. [PMID: 32751493 DOI: 10.3390/medicines7080045] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Revised: 07/28/2020] [Accepted: 07/28/2020] [Indexed: 02/06/2023]
Abstract
Iron and ascorbic acid (vitamin C) are essential nutrients for the normal growth and development of humans, and their deficiency can result in serious diseases. Their interaction is of nutritional, physiological, pharmacological and toxicological interest, with major implications in health and disease. Millions of people are using pharmaceutical and nutraceutical preparations of these two nutrients, including ferrous ascorbate for the treatment of iron deficiency anaemia and ascorbate combination with deferoxamine for increasing iron excretion in iron overload. The main function and use of vitamin C is its antioxidant activity against reactive oxygen species, which are implicated in many diseases of free radical pathology, including biomolecular-, cellular- and tissue damage-related diseases, as well as cancer and ageing. Ascorbic acid and its metabolites, including the ascorbate anion and oxalate, have metal binding capacity and bind iron, copper and other metals. The biological roles of ascorbate as a vitamin are affected by metal complexation, in particular following binding with iron and copper. Ascorbate forms a complex with Fe3+ followed by reduction to Fe2+, which may potentiate free radical production. The biological and clinical activities of iron, ascorbate and the ascorbate–iron complex can also be affected by many nutrients and pharmaceutical preparations. Optimal therapeutic strategies of improved efficacy and lower toxicity could be designed for the use of ascorbate, iron and the iron–ascorbate complex in different clinical conditions based on their absorption, distribution, metabolism, excretion, toxicity (ADMET), pharmacokinetic, redox and other properties. Similar strategies could also be designed in relation to their interactions with food components and pharmaceuticals, as well as in relation to other aspects concerning personalized medicine.
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Ajsuvakova OP, Tinkov AA, Willkommen D, Skalnaya AA, Danilov AB, Pilipovich AA, Aschner M, Skalny AV, Michalke B, Skalnaya MG. Assessment of copper, iron, zinc and manganese status and speciation in patients with Parkinson's disease: A pilot study. J Trace Elem Med Biol 2020; 59:126423. [PMID: 31733982 DOI: 10.1016/j.jtemb.2019.126423] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Revised: 09/25/2019] [Accepted: 10/24/2019] [Indexed: 01/29/2023]
Abstract
BACKGROUND The objective of this pilot study was to assess iron (Fe), copper (Cu), zinc (Zn), and manganese (Mn) status (hair, serum, and urine) and speciation (serum) in Parkinson's disease (PD) patients. METHODS A pilot study involving a total of 27 subjects (13 PD patients, 14 controls) was performed. Serum, urine, and hair metal content was assessed using ICP-MS. Speciation analysis of Cu, Zn, Fe, and Mn was performed using a hybrid HPLC-ICP-MS system. RESULTS Group comparisons did not reveal any significant group difference in serum Cu, Zn, Fe, and Mn total metal level between PD patients and controls. Speciation analysis revealed a significant decrease in Cu/ceruloplasmin copper in association with elevation of low-molecular weight species (amino acids)-bound copper. It is proposed that in PD, binding of Cu(II) ions to ceruloplasmin is reduced and free copper ions coordinate with low molecular weight ligands. The level of Mn-albumin complexes in PD patients was more than 4-fold higher as compared to the respective value in the control group. The observed difference may be considered as a marker of redistribution between high and low molecular weight ligands. CONCLUSIONS Metal speciation is significantly affected in serum of PD-patients. These findings are indicative of the potential role of metal metabolism and PD pathogenesis, although the exact mechanisms of such associations require further detailed studies.
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Affiliation(s)
- Olga P Ajsuvakova
- I.M. Sechenov First Moscow State Medical University (Sechenov University), Trubetskaya St., 8-2, 119991 Moscow, Russia; Peoples' Friendship University of Russia (RUDN University), Miklukho-Maklay St., 10/2, Moscow 117198, Russia; Federal Scientific Center of Biological Systems and Agrotechnologies of the Russian Academy of Sciences, 9 Yanvarya St., 29, 460000 Orenburg, Russia.
| | - Alexey A Tinkov
- I.M. Sechenov First Moscow State Medical University (Sechenov University), Trubetskaya St., 8-2, 119991 Moscow, Russia; P.G. Demidov Yaroslavl State University, Sovetskaya st., 14, 150003 Yaroslavl, Russia; Federal Scientific Center of Biological Systems and Agrotechnologies of the Russian Academy of Sciences, 9 Yanvarya St., 29, 460000 Orenburg, Russia
| | - Desiree Willkommen
- RECIPE Chemicals and Instruments GmbH, Sternstraße 5A, 85386 Eching, Munich, Germany
| | - Anastasia A Skalnaya
- M.V. Lomonosov Moscow State University, Leninskie Gory, 1, 119991 Moscow, Russia
| | - Alexey B Danilov
- I.M. Sechenov First Moscow State Medical University (Sechenov University), Trubetskaya St., 8-2, 119991 Moscow, Russia
| | - Anna A Pilipovich
- I.M. Sechenov First Moscow State Medical University (Sechenov University), Trubetskaya St., 8-2, 119991 Moscow, Russia
| | - Michael Aschner
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, New York, USA
| | - Anatoly V Skalny
- I.M. Sechenov First Moscow State Medical University (Sechenov University), Trubetskaya St., 8-2, 119991 Moscow, Russia; Peoples' Friendship University of Russia (RUDN University), Miklukho-Maklay St., 10/2, Moscow 117198, Russia; Federal Scientific Center of Biological Systems and Agrotechnologies of the Russian Academy of Sciences, 9 Yanvarya St., 29, 460000 Orenburg, Russia
| | - Bernhard Michalke
- Helmholtz Zentrum München, Ingolstädter Landstraße 1, 85764 Neuherberg, Germany
| | - Margarita G Skalnaya
- I.M. Sechenov First Moscow State Medical University (Sechenov University), Trubetskaya St., 8-2, 119991 Moscow, Russia; Peoples' Friendship University of Russia (RUDN University), Miklukho-Maklay St., 10/2, Moscow 117198, Russia
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19
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Meshram P, Prakash U, Bhagat L, Abhilash, Zhao H, van Hullebusch ED. Processing of Waste Copper Converter Slag Using Organic Acids for Extraction of Copper, Nickel, and Cobalt. Minerals 2020; 10:290. [DOI: 10.3390/min10030290] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
An innovative, economical, and environmentally sound hydrometallurgical process has been proposed for recovering Cu, Ni, and Co from copper-rich converter slag by organic acids. In the leaching experiments, the effects of organic acid concentrations, pulp density, temperature, and time were investigated. Optimum recovery of 99.1% Cu, 89.2% Ni, 94% Co, and 99.2% Fe was achieved in 9–10 h at 308 K (35 °C) temperature and 15% pulp density with 2 N citric acid using <45 µm particles. Pourbaix diagrams of metal-water-citrate systems were supplemented to examine solubility of ligands at the desired conditions. Furthermore, the leaching mechanism was based on the SEM-EDS (energy-dispersive X-ray spectroscopy) and XRD characterization as well as the leaching results obtained.
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20
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Illés E, Patra SG, Marks V, Mizrahi A, Meyerstein D. The Fe II(citrate) Fenton reaction under physiological conditions. J Inorg Biochem 2020; 206:111018. [PMID: 32050088 DOI: 10.1016/j.jinorgbio.2020.111018] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Revised: 02/01/2020] [Accepted: 02/01/2020] [Indexed: 12/13/2022]
Abstract
The Fenton reaction of FeII(citrate) in the presence and absence of bicarbonate (HCO3-) is studied. It is found that the rate constant of the Fenton reaction (kobs) increases with increasing [citrate]. kobs also increase with increasing [HCO3-]; this effect is most significant at biological citrate concentrations. Methane and ethane gases are formed from (CH3)2SO when the Fenton reaction is carried out in the presence of large [citrate] due to the reaction of the citrate radical, (-2OC)CH2C(OH)(CO2-)CH(CO2-)/(-2OC)CH2C(O)(CO2-)CH2(CO2-) with (CH3)2SO. In the absence of citrate (CH3)2SO2 is the main product of the Fenton reaction. However, in the presence of 0.10 mM citrate, no (CH3)2SO2 is formed, some (CH3)SOOH is formed, along with a low yield of beta-ketoglutaric acid. Formation of (CH3)SOOH and beta-ketoglutaric acid are due to the citrate radical and FeIV(citrate). In the presence of bicarbonate formation of abundant beta-ketoglutaric acid confirms the formation of carbonate radical anion (CO3-). Thus, bicarbonate affects the mechanism and kinetics of the reaction dramatically. Hydroxyl radicals (OH) are not formed in the presence of bicarbonate and probably also not in its absence. These results point out that hydroxyl radicals, formed by the Fenton reaction, do not initiate oxidative stress in biological systems.
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21
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Li Z, Wang L, Tian M, Li Z, Yuan Z, Lu C. Tris-Co(II)-H 2O 2 System-Mediated Durative Hydroxyl Radical Generation for Efficient Anionic Azo Dye Degradation by Integrating Electrostatic Attraction. ACS Omega 2019; 4:21704-21711. [PMID: 31891049 PMCID: PMC6933574 DOI: 10.1021/acsomega.9b02331] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Accepted: 09/03/2019] [Indexed: 06/10/2023]
Abstract
The development of simple Fenton/Fenton-like systems with durative hydroxyl radical (•OH) generation characteristics is significant to rapid organic pollutant degradation and cost-effective water treatment. In this study, a tris(hydroxymethyl)aminomethane (Tris)-incorporated Co(II)-H2O2 Fenton-like system has been successfully constructed for efficient Sunset Yellow (SY, a typical anionic azo dye) degradation under alkaline conditions. The mechanism of the enhanced degradation consists of two parts: first, the Tris-Co(II) complex triggers the durative generation of highly oxidized hydroxyl radicals; second, electrostatic attraction between SY and the Tris-Co(II) complex shortens the radical-SY interaction time and facilitates the degradation of SY. With the introduction of Tris to this proposed system, the decolorization rate of SY can be increased from 37.0 to 98.0% after 50 min and efficient SY degradation with a high total organic carbon removal efficiency (>59.0%) is achieved under a wide initial pH from 8.7 to 12.0. Moreover, the universality of the designed system for anionic azo dye degradation is verified with reactive red and congo red.
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Affiliation(s)
- Zenghe Li
- State
Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Lianying Wang
- State
Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Mingce Tian
- State
Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Zhe Li
- State
Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Zhiqin Yuan
- State
Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
- State
Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, China
| | - Chao Lu
- State
Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
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22
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Umezawa S, Akao H, Kubota M, Kino K. Chemoenzymatic oxygenation method for sesquiterpenoid synthesis based on Fe-chelate and ferric-chelate reductase. Biosci Biotechnol Biochem 2019; 84:780-788. [PMID: 31868104 DOI: 10.1080/09168451.2019.1707062] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Sesquiterpenoids are one of the most diverse groups in natural compounds with various chemical structures and bioactivities. In our previous work, we developed the chemoenzymatic oxygenation method based on the combination of Fe(II)-EDTA and ferric-chelate reductase that could synthesize (-)-rotundone, a key aroma sesquiterpenoid of black pepper. Fe(II)-EDTA catalyzed the oxygenation of sesquiterpene to sesquiterpenoid, and ferric-chelate reductase catalyzed the supply and regeneration of Fe(II)-EDTA in this system. We then investigated the effect of various Fe2+-chelates on the catalytic oxygenation of sesquiterpene and applied this system to the synthesis of odor sesquiterpenoids. We determined Fe(II)-NTA to be an efficient oxygenation catalyst by the screening approach focusing on ligand structures and coordination atoms of Fe2+-chelates. Valuable odor sesquiterpenoids such as (+)-nootkatone, (-)-isolongifolenone, and (-)-β-caryophyllene oxide were oxygenatively synthesized from each precursor sesquiterpene by 66%, 82%, and 67% of the molar conversion rate, respectively.Abbreviations: EDTA: ethylenediaminetetraacetate; NTA: nitrilotriacetate; DTPA: diethylenetriaminepentaacetate; phen: o-phenanthroline; cyclam: 1,4,8,11-tetraazacyclotetradecane; TPA: tris(2-pyridylmethyl)amine; GlcDH: glucose dehydrogenase; HP-β-CD: hydroxypropyl-β-cyclodextrin.
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Affiliation(s)
- Satoru Umezawa
- Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, Tokyo, Japan.,Technical Research Institute R&D Center, T. Hasegawa Co., Ltd., Kanagawa, Japan
| | - Hiroko Akao
- Technical Research Institute R&D Center, T. Hasegawa Co., Ltd., Kanagawa, Japan
| | - Mio Kubota
- Technical Research Institute R&D Center, T. Hasegawa Co., Ltd., Kanagawa, Japan
| | - Kuniki Kino
- Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, Tokyo, Japan
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23
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Zhao Z. Iron and oxidizing species in oxidative stress and Alzheimer's disease. Aging Med (Milton) 2019; 2:82-87. [PMID: 31942516 PMCID: PMC6880687 DOI: 10.1002/agm2.12074] [Citation(s) in RCA: 65] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Revised: 05/30/2019] [Accepted: 05/31/2019] [Indexed: 12/22/2022] Open
Abstract
Iron species can participate in the Fenton or Fenton-like reaction to generate oxidizing species that can cause oxidative damages to biomolecules and induce oxidative stress in the body. Furthermore, iron accumulation and oxidative stress have been shown to associate with the pathological progression of neurodegenerative disorders, including Alzheimer's disease (AD) and Parkinson's disease (PD). In this review, the role of iron species in generating the most deleterious free radical species (ie, hydroxyl radical) and effects of this species in causing oxidative stress in vivo are described. The implications of oxidative stress and the recently recognized cell death pathway (ie, ferroptosis) to AD are addressed. Strategies to combat this neurodegenerative disease, such as iron chelation and antioxidant therapies, and future research directions on this aspect are also discussed.
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Affiliation(s)
- Zhongwei Zhao
- School of Pharmaceutical SciencesCapital Medical UniversityBeijingChina
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24
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Abstract
Fe(III) delivery from blood plasma to cells via the transferrin (Tf) cycle was studied intensively due to its crucial role in Fe homeostasis. Tf-cycle disruptions are linked to anemia, infections, immunodeficiency, and neurodegeneration. Biolayer interferometry (BLI) enabled direct kinetic and thermodynamic measurements for all Tf-cycle steps in a single in vitro experiment using Tf within blood serum or released into the medium by cultured liver cells. In these media, known Tf cycle features were reproduced, and unprecedented insights were gained into conditions of rapid endosomal (pH 5.6) Fe(III) release from the Tf-Tf receptor 1 (TfR1) adduct. This release occurred via synergistic citrate and ascorbate effects, which pointed to respective roles as the likely elusive Fe chelator and reductant within the Tf cycle. These results explain enhanced cellular Fe uptake by ascorbate, the clinical efficacy of anemia treatment with Fe citrate and ascorbate, and dietary effects associated with loss of Fe homeostasis, including the large health burden of infections and neurodegeneration.
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Affiliation(s)
- Aviva Levina
- School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
| | - Peter A. Lay
- School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
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Zeng B, Zhang P, Zheng M, Xiao N, Han J, Wang C, Wang Z, Zhao Z. Detection and identification of the oxidizing species generated from the physiologically important Fenton-like reaction of iron(II)-citrate with hydrogen peroxide. Arch Biochem Biophys 2019; 668:39-45. [PMID: 31100219 DOI: 10.1016/j.abb.2019.05.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2019] [Revised: 04/18/2019] [Accepted: 05/06/2019] [Indexed: 12/18/2022]
Abstract
The Fenton-like reaction of iron(II)-citrate with hydrogen peroxide is physiologically important because it is associated with the oxidative stress and pathological processes induced by the redox-active iron pool in vivo. However, the oxidizing species generated from this reaction at neutral pH has not been convincingly identified because two extremely unstable and hard-to-differentiate species, the hydroxyl radical (•OH) and iron(IV) (ferryl) species, can be produced. Identifying this species is essential for understanding the reaction mechanism. Although there were few data that reported the detection of •OH from this reaction by using the EPR and fluorescence techniques, most of these data were obtained without the necessary assessment with a •OH scavenger. Furthermore, these two techniques may not be able to differentiate the •OH and iron(IV) species. Thus, these reported data cannot lead to a convincing conclusion that the •OH, not the iron(IV) species, was generated. Therefore, in the study reported herein, we carried out systematic investigations first by using the EPR and fluorescence techniques combined with a •OH scavenger to detect the oxidizing species generated from this Fenton-like reaction. Then we utilized NMR spectroscopy and for the first time obtained convincing evidence to demonstrate that this oxidizing species is the •OH rather than iron(IV) species. We also determined the second-order rate constant of the reaction, 3.6 × 103 M-1s-1 (pH7.0, 25 °C), by using the stopped-flow spectrophotometry. On the basis of these findings, a scheme is proposed for the mechanism of this physiologically important Fenton-like reaction.
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Affiliation(s)
- Binglin Zeng
- School of Pharmaceutical Sciences, Capital Medical University, Beijing, 100069, China; Beijing Area Major Laboratory of Peptide and Small Molecular Drugs; Engineering Research Center of Endogenous Prophylactic of Ministry of Education of China, Beijing, China
| | - Peifeng Zhang
- School of Pharmaceutical Sciences, Capital Medical University, Beijing, 100069, China; Beijing Area Major Laboratory of Peptide and Small Molecular Drugs; Engineering Research Center of Endogenous Prophylactic of Ministry of Education of China, Beijing, China
| | - Meiqing Zheng
- Core Facility Center, Capital Medical University, Beijing, 100069, China
| | - Nao Xiao
- School of Pharmaceutical Sciences, Capital Medical University, Beijing, 100069, China; Beijing Area Major Laboratory of Peptide and Small Molecular Drugs; Engineering Research Center of Endogenous Prophylactic of Ministry of Education of China, Beijing, China
| | - Jialun Han
- School of Pharmaceutical Sciences, Capital Medical University, Beijing, 100069, China; Beijing Area Major Laboratory of Peptide and Small Molecular Drugs; Engineering Research Center of Endogenous Prophylactic of Ministry of Education of China, Beijing, China
| | - Can Wang
- School of Pharmaceutical Sciences, Capital Medical University, Beijing, 100069, China; Beijing Area Major Laboratory of Peptide and Small Molecular Drugs; Engineering Research Center of Endogenous Prophylactic of Ministry of Education of China, Beijing, China
| | - Zheng Wang
- School of Pharmaceutical Sciences, Capital Medical University, Beijing, 100069, China; Beijing Area Major Laboratory of Peptide and Small Molecular Drugs; Engineering Research Center of Endogenous Prophylactic of Ministry of Education of China, Beijing, China
| | - Zhongwei Zhao
- School of Pharmaceutical Sciences, Capital Medical University, Beijing, 100069, China; Beijing Area Major Laboratory of Peptide and Small Molecular Drugs; Engineering Research Center of Endogenous Prophylactic of Ministry of Education of China, Beijing, China; Present address: College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, 100029, China.
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26
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Abstract
A major form of toxicity arises from the ability of iron to redox cycle, that is, to accept an electron from a reducing compound and to pass it on to H2O2 (the Fenton reaction). In order to do so, iron must be suitably complexed to avoid formation of Fe2O3. The ligands determine the electrode potential; this information should be known before experiments are carried out. Only one-electron transfer reactions are likely to be significant; thus two-electron potentials should not be used to determine whether an iron(III) complex can be reduced or oxidized. Ascorbate is the relevant reducing agent in blood serum, which means that iron toxicity in this compartment arises from the ascorbate-driven Fenton reaction. In the cytosol, an iron(II)-glutathione complex is likely to be the low-molecular weight iron complex involved in toxicity. When physiologically relevant concentrations are used the window of redox opportunity ranges from +0.1 V to +0.9 V. The electrode potential for non-transferrin-bound iron in the form of iron citrate is close to 0 V and the reduction of iron(III) citrate by ascorbate is slow. The clinically utilised chelators desferrioxamine, deferiprone and deferasirox in each case render iron complexes with large negative electrode potentials, thus being effective in preventing iron redox cycling and the associated toxicity resulting from such activity. There is still uncertainty about the product of the Fenton reaction, HO• or FeO2+.
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Affiliation(s)
- W H Koppenol
- Schwändibergstrasse 25, CH-8784 Braunwald, Switzerland; Emeritus, Department of Chemistry and Applied Biosciences, ETHZ, CH-8093 Zürich, Switzerland.
| | - R H Hider
- Department of Pharmacy, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, UK
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Badu-Boateng C, Naftalin RJ. Ascorbate and ferritin interactions: Consequences for iron release in vitro and in vivo and implications for inflammation. Free Radic Biol Med 2019; 133:75-87. [PMID: 30268889 DOI: 10.1016/j.freeradbiomed.2018.09.041] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Revised: 09/25/2018] [Accepted: 09/26/2018] [Indexed: 01/19/2023]
Abstract
This review discusses the chemical mechanisms of ascorbate-dependent reduction and solubilization of ferritin's ferric iron core and subsequent release of ferrous iron. The process is accelerated by low concentrations of Fe(II) that increase ferritin's intrinsic ascorbate oxidase activity, hence increasing the rate of ascorbate radical formation. These increased rates of ascorbate oxidation provide reducing equivalents (electrons) to ferritin's core and speed the core reduction rates with subsequent solubilization and release of Fe(II). Ascorbate-dependent solubilization of ferritin's iron core has consequences relating to the interpretation of 59Fe uptake sourced from 59Fe-lebelled holotransferrin into ferritin. Ascorbate-dependent reduction of the ferritin core iron solubility increases the size of ferritin's iron exchangeable pool and hence the rate and amount of exchange uptake of 59Fe into ferritin, whilst simultaneously increasing net iron release rate from ferritin. This may rationalize the inconsistency that ascorbate apparently stabilizes 59Fe ferritin and retards lysosomal ferritinolysis and whole cell 59Fe release, whilst paradoxically increasing the rate of net iron release from ferritin. This capacity of ascorbate and iron to synergise ferritin iron release has pathological significance, as it lowers the concentration at which ascorbate activates ferritin's iron release to within the physiological range (50-250 μM). These effects have relevance to inflammatory pathology and to the pro-oxidant effects of ascorbate in cancer therapy and cell death by ferroptosis.
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Affiliation(s)
- Charles Badu-Boateng
- Kings, BHF Centre of Research Excellence, School of Cardiovascular Medicine & Sciences, Faculty of Life Sciences & Medicine, King's College London, 150 Stamford Street, London SE1 9NH, UK
| | - Richard J Naftalin
- Kings, BHF Centre of Research Excellence, School of Cardiovascular Medicine & Sciences, Faculty of Life Sciences & Medicine, King's College London, 150 Stamford Street, London SE1 9NH, UK
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28
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Saratale RG, Sivapathan S, Saratale GD, Banu JR, Kim DS. Hydroxamic acid mediated heterogeneous Fenton-like catalysts for the efficient removal of Acid Red 88, textile wastewater and their phytotoxicity studies. Ecotoxicol Environ Saf 2019; 167:385-395. [PMID: 30366272 DOI: 10.1016/j.ecoenv.2018.10.042] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Revised: 10/08/2018] [Accepted: 10/10/2018] [Indexed: 06/08/2023]
Abstract
Heterogeneous Fenton-like catalyst and its industrial application are increasingly given importance for its non-selective mineralization of organic pollutants in broad pH range. Current study, utilized an aromatic hydroxamic acid derivative 2-hydroxypyridine-N-oxide (HpO), for the construction of iron-Hpo ligand catalyst supported on granular activated carbon (GAC). 8-Hydroxyquinoline and citric acid as non-hydroxamic aromatic and aliphatic Fenton-like catalysts were used for comparative evaluation of the efficiency with targeted catalyst (iron-HpO-GAC). This novel catalyst iron-HpO-GAC exhibits excellent efficiency in Acid Red 88 dye removal in the presence of hydrogen peroxide as oxidant at acidic, basic as well as at neutral conditions. Operational conditions for the catalytic oxidation including temperature, dye concentration, pH and catalyst dosage were systematically investigated and analyzed through kinetic studies. Thermodynamic analysis of the catalytic dye removal revealed that the system could oxidize pollutants faster with less activation energy requirement. Higher level of recyclability and stability of the catalyst with less iron leaching was achieved. Finally, the real time application of the catalyst was investigated through successful repeated treatment for actual industrial wastewater. The phytotoxicity assay (with respect to plant Phaseolus mungo) revealed that the degradation of Acid Red 88 and dye wastewater produced nontoxic metabolites which increases its potential application. This study emphasizes the viability of hydroxamate mediated efficient Fenton-like oxidation as a novel approach in designing economically viable pollutant removal technology.
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Affiliation(s)
- Rijuta Ganesh Saratale
- Research Institute of Biotechnology and Medical Converged Science, Dongguk University-Seoul, Ilsandong-gu, Goyang-si, Gyeonggi-do 10326, Republic of Korea
| | - Silojah Sivapathan
- Department of Environmental Science and Engineering, Ewha Womans University, Seoul 120-750, Republic of Korea
| | - Ganesh Dattatraya Saratale
- Department of Food Science & Biotechnology, Dongguk University-Seoul, Dongguk-ro, Ilsandong-gu, Goyang-si, Gyeonggi-do 10326, Republic of Korea
| | - J Rajesh Banu
- Department of Civil Engineering, Anna University Regional Campus, Tirunelveli, India
| | - Dong-Su Kim
- Department of Environmental Science and Engineering, Ewha Womans University, Seoul 120-750, Republic of Korea.
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29
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Abstract
Hydrogen peroxide (H2O2) is generated in numerous biological processes. It transmits cellular signals, contributes to oxidative folding of exported proteins, and, in excess, can be damaging to cells and tissues. Although a strong oxidant, high activation energy barriers make it unreactive with most biological molecules. Its main reactions are with transition metal centers, selenoproteins and selected thiol proteins, with glutathione peroxidases (GPxs) and peroxiredoxins (Prxs) being major targets. It reacts slowly with most thiol proteins, and how they become oxidized during redox signal transmission is not well understood. Recent Advances: Kinetic analysis indicates that Prxs and GPxs are overwhelmingly favored as targets for H2O2 in cells. Studies with localized probes indicate that H2O2 can be produced in cellular microdomains and be consumed by highly reactive targets before it can diffuse to other parts of the cell. Inactivation of these targets alone will not confine it to its site of production. Kinetic data indicate that oxidation of regulatory thiol proteins by H2O2 requires a facilitated mechanism such as directed transfer from source to target or a relay mediated through a highly reactive sensor. Critical Issues and Future Directions: Absolute rates of H2O2 production and steady-state concentrations in cells still need to be characterized. More information on cellular sites of production and action is required, and specific mechanisms of oxidation of regulatory proteins during redox signaling require further characterization. Antioxid. Redox Signal. 29, 541-551.
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Affiliation(s)
- Christine C Winterbourn
- Department of Pathology, Centre for Free Radical Research, University of Otago Christchurch , Christchurch, New Zealand
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30
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Abstract
Eukaryotic cells, whether free-living or organismal, rely on metallo-reductases to process environmental ferric iron and cupric copper prior to uptake. In addition, some free-living eukaryotes (e.g. fungi and algae) couple ferri-reduction to ferro-oxidation, a process catalyzed by a small cohort of multi-copper oxidases; in these organisms, the ferric iron product is a ligand for cell iron uptake via a ferric iron permease. In addition to their support of iron uptake in lower eukaryotes, ferroxidases support ferrous iron efflux in Chordata; in this process the release of the ferrous iron from the efflux transporter is catalyzed by its ferroxidation. Last, ferroxidases also catalyze the oxidation of cuprous copper and, as metallo-oxidases, mirror the dual activity of the metallo-reductases. This Perspective examines the teleos of the yin-yang of this redox cycling of iron and copper in their metabolism.
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Affiliation(s)
- Daniel J Kosman
- Department of Biochemistry, Jacobs School of Medicine and Biomedical Sciences, The University at Buffalo, Farber Hall Room 140, 3435 Main St., Buffalo, NY 14214-3000, USA.
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31
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Roth-Walter F, Pacios LF, Bianchini R, Jensen-Jarolim E. Linking iron-deficiency with allergy: role of molecular allergens and the microbiome. Metallomics 2017; 9:1676-1692. [PMID: 29120476 DOI: 10.1039/c7mt00241f] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Atopic individuals tend to develop a Th2 dominant immune response, resulting in hyperresponsiveness to harmless antigens, termed allergens. In the last decade, epidemiological studies have emerged that connected allergy with a deficient iron-status. Immune activation under iron-deficient conditions results in the expansion of Th2-, but not Th1 cells, can induce class-switching in B-cells and hampers the proper activation of M2, but not M1 macrophages. Moreover, many allergens, in particular with the lipocalin and lipocalin-like folds, seem to be capable of binding iron indirectly via siderophores harboring catechol moieties. The resulting locally restricted iron-deficiency may then lead during immune activation to the generation of Th2-cells and thus prepare for allergic sensitization. Moreover, iron-chelators seem to also influence clinical reactivity: mast cells accumulate iron before degranulation and seem to respond differently depending on the type of the encountered siderophore. Whereas deferoxamine triggers degranulation of connective tissue-type mast cells, catechol-based siderophores reduce activation and degranulation and improve clinical symptoms. Considering the complex interplay of iron, siderophores and immune molecules, it remains to be determined whether iron-deficiencies are the cause or the result of allergy.
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Affiliation(s)
- Franziska Roth-Walter
- Department of Comparative Medicine, at the Interuniversity Messerli Research Institute, University of Veterinary Medicine Vienna, Medical University of Vienna and University of Vienna, Vienna, Austria.
| | - Luis F Pacios
- Centro de Biotecnología y Genómica de Plantas (CBGP, UPM-INIA), Universidad Politécnica de Madrid (UPM) - Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Campus de Montegancedo-UPM, 28223 Pozuelo de Alarcón, Madrid, Spain
| | - Rodolfo Bianchini
- Department of Comparative Medicine, at the Interuniversity Messerli Research Institute, University of Veterinary Medicine Vienna, Medical University of Vienna and University of Vienna, Vienna, Austria.
| | - Erika Jensen-Jarolim
- Department of Comparative Medicine, at the Interuniversity Messerli Research Institute, University of Veterinary Medicine Vienna, Medical University of Vienna and University of Vienna, Vienna, Austria. and Institute of Pathophysiology and Allergy Research, Center of Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
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32
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Affiliation(s)
- Zhen Yu
- Department of Chemistry and Biochemistry; The Ohio State University; 100 West 18th Avenue Columbus OH 43210 USA
| | - James A. Cowan
- Department of Chemistry and Biochemistry; The Ohio State University; 100 West 18th Avenue Columbus OH 43210 USA
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33
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Badu-Boateng C, Pardalaki S, Wolf C, Lajnef S, Peyrot F, Naftalin RJ. Labile iron potentiates ascorbate-dependent reduction and mobilization of ferritin iron. Free Radic Biol Med 2017; 108:94-109. [PMID: 28336129 DOI: 10.1016/j.freeradbiomed.2017.03.015] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Revised: 01/29/2017] [Accepted: 03/15/2017] [Indexed: 12/18/2022]
Abstract
Ascorbate mobilizes iron from equine spleen ferritin by two separate processes. Ascorbate alone mobilizes ferritin iron with an apparent Km (ascorbate) ≈1.5mM. Labile iron >2μM, complexed with citrate (10mM), synergises ascorbate-dependent iron mobilization by decreasing the apparent Km (ascorbate) to ≈270μM and raising maximal mobilization rate by ≈5-fold. Catalase reduces the apparent Km(ascorbate) for both ascorbate and ascorbate+iron dependent mobilization by ≈80%. Iron mobilization by ascorbate alone has a higher activation energy (Ea=45.0±5.5kJ/mole) than when mediated by ascorbate with labile iron (10μM) (Ea=13.7±2.2kJ/mole); also mobilization by iron-ascorbate has a three-fold higher pH sensitivity (pH range 6.0-8.0) than with ascorbate alone. Hydrogen peroxide inhibits ascorbate's iron mobilizing action. EPR and autochemiluminescence studies show that ascorbate and labile iron within ferritin enhances radical formation, whereas ascorbate alone produces negligible radicals. These findings suggest that iron catalysed single electron transfer reactions from ascorbate, involving ascorbate or superoxide and possibly ferroxidase tyrosine radicals, accelerate iron mobilization from the ferroxidase centre more than EPR silent, bi-dentate two-electron transfers. These differing modes of electron transference from ascorbate mirror the known mono and bidentate oxidation reactions of dioxygen and hydrogen peroxide with di-ferrous iron at the ferroxidase centre. This study implies that labile iron, at physiological pH, complexed with citrate, synergises iron mobilization from ferritin by ascorbate (50-4000μM). This autocatalytic process can exacerbate oxidative stress in ferritin-containing inflamed tissue.
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Affiliation(s)
- Charles Badu-Boateng
- Cardiovascular Division, British Heart Foundation Centre of Research Excellence and Physiology Department, King's College London, 150 Stamford Street, London SE1 9NH, UK
| | - Sofia Pardalaki
- Cardiovascular Division, British Heart Foundation Centre of Research Excellence and Physiology Department, King's College London, 150 Stamford Street, London SE1 9NH, UK
| | | | - Sonia Lajnef
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques (UMR CNRS 8601), Université Paris Descartes, 75006 Paris, France
| | - Fabienne Peyrot
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques (UMR CNRS 8601), Université Paris Descartes, 75006 Paris, France; ESPE de l'académie de Paris, Université Paris Sorbonne, 75016 Paris, France
| | - Richard J Naftalin
- Cardiovascular Division, British Heart Foundation Centre of Research Excellence and Physiology Department, King's College London, 150 Stamford Street, London SE1 9NH, UK.
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34
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de la Vega-Hernández K, Antuch M, Cuesta-Rubio O, Núñez-Figueredo Y, Pardo-Andreu GL. Discerning the antioxidant mechanism of rapanone: A naturally occurring benzoquinone with iron complexing and radical scavenging activities. J Inorg Biochem 2017; 170:134-147. [PMID: 28237732 DOI: 10.1016/j.jinorgbio.2017.02.019] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2016] [Revised: 02/10/2017] [Accepted: 02/17/2017] [Indexed: 02/01/2023]
Abstract
Oxidative stress resulting from iron and reactive oxygen species (ROS) homeostasis breakdown has been implicated in several diseases. Therefore, molecules capable of binding iron and/or scavenging ROS may be reasonable strategies for protecting cells. Rapanone is a naturally occurring hydroxyl-benzoquinone with a privileged chelating structure. In this work, we addressed the antioxidant properties of rapanone concerning its iron-chelating and scavenging activities, and its protective potential against iron and tert-butyl hydroperoxide-induced damage to mitochondria. Experimental determinations revealed the formation of rapanone-Fe(II)/Fe(III) complexes. Additionally, the electrochemical assays indicated that rapanone oxidized Fe(II) and O2-, thus inhibiting Fenton-Haber-Weiss reactions. Furthermore, rapanone displayed an increased 2,2-diphenyl-1-picrylhydrazyl radical scavenging ability in the presence of Fe(II). The above results explained the capacity of rapanone to provide near-full protection against iron and tert-butyl hydroperoxide induced mitochondrial lipid peroxidation in energized organelles, which fail under non-energized condition. We postulate that rapanone affords protection against iron and reactive oxygen species by means of both iron chelating and iron-stimulated free radical scavenging activity.
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Affiliation(s)
- Karen de la Vega-Hernández
- Departamento de Farmacia, Instituto de Farmacia y Alimentos, Universidad de La Habana, Ave. 23 # 21425 e/ 214 y 222, La Coronela, La Lisa, CP 13600, La Habana, Cuba
| | - Manuel Antuch
- Departamento de Química-Física, Facultad de Química, Universidad de la Habana, Ave. Zapata y G, Vedado, CP 10400 La Habana, Cuba
| | | | | | - Gilberto L Pardo-Andreu
- Centro de Estudio para las Investigaciones y Evaluaciones Biológicas, Instituto de Farmacia y Alimentos, Universidad de La Habana, Calle 222, No. 2317 entre 23 y 31, La Coronela, La Lisa, CP 13600 La Habana, Cuba.
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35
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Zhang P, Yao W, Yuan S. Citrate-enhanced release of arsenic during pyrite oxidation at circumneutral conditions. Water Res 2017; 109:245-252. [PMID: 27912099 DOI: 10.1016/j.watres.2016.11.058] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Revised: 11/20/2016] [Accepted: 11/23/2016] [Indexed: 06/06/2023]
Abstract
The release of arsenic (As) from the oxidation of As-rich pyrite is an important source of the high arsenic in groundwater. As a widespread low-molecular-weight organic acid, citrate plays an important role on the cycling of Fe(II)/Fe(III) through complexation in circumneutral subsurface environments, while the influence of citrate on the release of As from the oxidation of As-rich pyrite is poorly understood. In this study, As was loaded onto pyrite particles under anoxic conditions, and its release was investigated in the presence of 0-1 mM citrate at pH 7.4 under oxic conditions. As-loaded pyrite suspension was prepared by the equilibrium of 2.67 μM As(III) in 10 g/L pyrite under anoxic conditions with the decrease in dissolved As(III) concentration to 1 μM. The suspension was subsequently exposed to air for oxygenation. In the absence of citrate, the oxygenation decreased the partitioning of As in the solution because of the re-adsorption of aqueous As by the in situ generated Fe(III) oxyhydroxides. However, with the increase in citrate concentration from 0.1 to 1 mM, the As partitioned in the solution increased from 0.3 to 2.67 μM. In the presence of 1 mM citrate, the As(III) was almost completely oxidized to As(V) during the oxygenation. The mechanisms of citrate-enhanced release of As were mainly attributed to the ligand exchange of citrate with As for pyrite surface sites, the competitive adsorption of citrate with As on Fe(III) oxyhydroxides and pyrite, and the partitioning of As on the newly formed Fe(III) colloids. This finding presents an overlooked mechanism of the release of pyrite-associated As under oxic and circumneutral conditions.
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Affiliation(s)
- Peng Zhang
- State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, 388 Lumo Road, Wuhan, 430074, PR China
| | - Weiyu Yao
- School of Environmental Studies, China University of Geosciences, 388 Lumo Road, Wuhan, 430074, PR China
| | - Songhu Yuan
- State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, 388 Lumo Road, Wuhan, 430074, PR China.
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36
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Shi F, Zhang P, Mao Y, Wang C, Zheng M, Zhao Z. The nitroxide Tempo inhibits hydroxyl radical production from the Fenton-like reaction of iron(II)-citrate with hydrogen peroxide. Biochem Biophys Res Commun 2016; 483:159-164. [PMID: 28042034 DOI: 10.1016/j.bbrc.2016.12.174] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2016] [Accepted: 12/26/2016] [Indexed: 12/23/2022]
Abstract
In vivo physiological ligand citrate can bind iron(II) ions to form the iron(II)-citrate complex. Inhibition of hydroxyl radical (OH) production from the Fenton-like reaction of iron(II)-citrate with H2O2 is biologically important, as this reaction may account for one of the mechanisms of the labile iron pool in vivo to induce oxidative stress and pathological conditions. Nitroxides have promising potentials as therapeutic antioxidants. However, there are controversial findings indicating that they not only act as antioxidants but also as pro-oxidants when engaged in Fenton reactions. Although the underlying mechanisms are proposed to be the inhibition or enhancement of the OH production by nitroxides, the proposed elucidations are only based on assessing biological damages and not demonstrated directly by measuring the OH production in the presence of nitroxides. In this study, therefore, we employed EPR and fluorescence spectroscopies to show direct evidence that nitroxide 2,2,6,6-tetramethyl-piperidine-1-oxyl (Tempo) inhibited OH production from the Fenton-like reaction of iron(II)-citrate with H2O2 by up to 90%. We also demonstrated spectrophotometrically, for the first time, that this inhibition was due to oxidation of the iron(II)-citrate by Tempo with a stoichiometry of Tempo:Iron(III)-citrate = 1.1:1.0. A scheme was proposed to illustrate the roles of nitroxides engaged in Fenton/Fenton-like reactions.
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Affiliation(s)
- Fengqiang Shi
- Department of Chemical Biology, School of Pharmaceutical Sciences, Capital Medical University, Beijing 100069, China
| | - Peifeng Zhang
- Department of Chemical Biology, School of Pharmaceutical Sciences, Capital Medical University, Beijing 100069, China
| | - Yujia Mao
- Department of Chemical Biology, School of Pharmaceutical Sciences, Capital Medical University, Beijing 100069, China
| | - Can Wang
- Department of Chemical Biology, School of Pharmaceutical Sciences, Capital Medical University, Beijing 100069, China
| | - Meiqing Zheng
- Department of Chemical Biology, School of Pharmaceutical Sciences, Capital Medical University, Beijing 100069, China
| | - Zhongwei Zhao
- Department of Chemical Biology, School of Pharmaceutical Sciences, Capital Medical University, Beijing 100069, China.
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37
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Abstract
Transfusion of rbc is a routine, often lifesaving procedure that depends on a stored supply of blood. In the US, 42 days is the maximum duration allowed for rbc storage; however, several lines of evidence indicate that patients that receive blood at the upper end of this storage limit are at a higher risk of morbidity and mortality. In this issue of the JCI, Rapido and colleagues evaluated the effects of transfusing one unit of blood close to the storage limit into healthy adults. Compared to those that received rbc stored for five weeks or less, those that received blood stored for six weeks showed several effects associated with increased harm, including disruption in iron handling, increased extravascular hemolysis, and the formation of circulating non-transferrin-bound iron. Together, the results of this study suggest that current maximum storage durations should be carefully reevaluated.
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38
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Kontoghiorghe CN, Kontoghiorghes GJ. New developments and controversies in iron metabolism and iron chelation therapy. World J Methodol 2016; 6:1-19. [PMID: 27019793 PMCID: PMC4804243 DOI: 10.5662/wjm.v6.i1.1] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/07/2015] [Revised: 10/16/2015] [Accepted: 12/18/2015] [Indexed: 02/06/2023] Open
Abstract
Iron is essential for all organisms including microbial, cancer and human cells. More than a quarter of the human population is affected by abnormalities of iron metabolism, mainly from iron deficiency and iron overload. Iron also plays an important role in free radical pathology and oxidative damage which is observed in almost all major diseases, cancer and ageing. New developments include the complete treatment of iron overload and reduction of morbidity and mortality in thalassaemia using deferiprone and selected deferiprone/deferoxamine combinations and also the use of the maltol iron complex in the treatment of iron deficiency anaemia. There is also a prospect of using deferiprone as a universal antioxidant in non iron overloaded diseases such as neurodegenerative, cardiovascular, renal, infectious diseases and cancer. New regulatory molecules of iron metabolism such as endogenous and dietary chelating molecules, hepcidin, mitochondrial ferritin and their role in health and disease is under evaluation. Similarly, new mechanisms of iron deposition, removal, distribution and toxicity have been identified using new techniques such as magnetic resonance imaging increasing our understanding of iron metabolic processes and the targeted treatment of related diseases. The uniform distribution of iron in iron overload between organs and within each organ is no longer valid. Several other controversies such as the toxicity impact of non transferrin bound iron vs injected iron, the excess levels of iron in tissues causing toxicity and the role of chelation on iron absorption need further investigation. Commercial interests of pharmaceutical companies and connections to leading journals are playing a crucial role in shaping worldwide medical opinion on drug sales and use but also patients’ therapeutic outcome and safety. Major controversies include the selection criteria and risk/benefit assessment in the use of deferasirox in thalassaemia and more so in idiopathic haemochromatosis, thalassaemia intermedia and ex-thalassaemia transplanted patients who are safely treated with venesection. Iron chelating drugs can override normal regulatory pathways, correct iron imbalance and minimise iron toxicity. The use of iron chelating drugs as main, alternative or adjuvant therapy is in progress in many conditions, especially those with non established or effective therapies.
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Aljwaid H, White DL, Collard KJ, Moody AJ, Pinkney JH. Non-transferrin-bound iron is associated with biomarkers of oxidative stress, inflammation and endothelial dysfunction in type 2 diabetes. J Diabetes Complications 2015; 29:943-9. [PMID: 26104728 DOI: 10.1016/j.jdiacomp.2015.05.017] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/24/2015] [Revised: 05/14/2015] [Accepted: 05/18/2015] [Indexed: 12/19/2022]
Abstract
AIMS To investigate the association between circulating non-transferrin-bound iron [NTBI], and markers of oxidative stress, endothelial function and inflammation in subjects with type 2 diabetes and non-diabetic subjects with varying degrees of obesity. METHODS Plasma NTBI was measured by HPLC, together with total iron, iron-binding capacity, transferrin saturation and soluble transferrin receptor, together with total and reduced ascorbate, malondialdehyde [MDA], E-selectin and high-sensitivity c-reactive protein [hs-CRP] in groups of 28 subjects with type 2 diabetes, 28 non-obese controls and 17 obese non-diabetic subjects. RESULTS Levels of NTBI were higher than controls in the diabetes group, but the total serum iron levels were lower. MDA levels were higher than controls in both the diabetes and obese groups, and this was associated with higher levels of oxidised ascorbate. hs-CRP levels were higher in both the diabetes and obese groups, and E-selectin was significantly higher in the diabetes group. There were strong positive correlations between HbA1c levels and NTBI [P<0.01], HbA1c and E-selectin [P<0.001] and NTBI and E-selectin [P<0.02] in the diabetes group. CONCLUSION These results support the hypothesis that iron-mediated oxidative stress may be a mechanism linking poor glycaemic control with vascular dysfunction in type 2 diabetes.
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Affiliation(s)
- Husam Aljwaid
- School of Biological Sciences, Faculty of Science & Environment, University of Plymouth, Drake Circus, Plymouth, PL4 8AA, UK.
| | - Desley L White
- School of Health Professions, Faculty of Health & Human Sciences, University of Plymouth, Derriford Road, Plymouth, UK.
| | - Keith J Collard
- School of Health Professions, Faculty of Health & Human Sciences, University of Plymouth, Derriford Road, Plymouth, UK.
| | - A John Moody
- School of Biological Sciences, Faculty of Science & Environment, University of Plymouth, Drake Circus, Plymouth, PL4 8AA, UK.
| | - Jonathan H Pinkney
- Centre for Biomedical Research, Translational and Stratified Medicine, Peninsula Schools of Medicine & Dentistry, Plymouth, UK.
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