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Stoltzfus AT, Campbell CJ, Worth MM, Hom K, Stemmler TL, Michel SLJ. Pb(II) coordination to the nonclassical zinc finger tristetraprolin: retained function with an altered fold. J Biol Inorg Chem 2023; 28:85-100. [PMID: 36478265 DOI: 10.1007/s00775-022-01980-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Accepted: 10/26/2022] [Indexed: 12/13/2022]
Abstract
Tristetraprolin (TTP) is a nonclassical CCCH zinc finger (ZF) that plays a crucial role in regulating inflammation. TTP regulates cytokine mRNAs by specific binding of its two conserved ZF domains (CysX8CysX5CysX3His) to adenylate-uridylate-rich sequences (AREs) at the 3'-untranslated region, leading to degradation of the RNA. Dysregulation of TTP in animal models has demonstrated several cytokine-related syndromes, including chronic inflammation and autoimmune disorders. Exposure to Pb(II), a prevalent environmental toxin, is known to contribute to similar pathologies, in part by disruption of and/or competition with cysteine-rich metalloproteins. TTP's role during stress as a ubiquitous translational regulator of cell signaling (and dysfunction), which may underpin various phenotypes of Pb(II) toxicity, highlights the importance of understanding the interaction between TTP and Pb(II). The impact of Pb(II) binding on TTP's fold and RNA-binding function was analyzed via UV-Vis spectroscopy, circular dichroism, X-ray absorption spectroscopy, nuclear magnetic resonance spectroscopy, and fluorescence anisotropy. A construct containing the two ZF domains of TTP (TTP-2D) bound to Pb(II) with nanomolar affinity and exhibited a different geometry and fold in comparison to Zn2-TTP-2D. Despite the altered secondary structure, Pb(II)-substituted TTP-2D bound a canonical ARE sequence more selectively than Zn2-TTP-2D. Taken together, these data suggest that Pb(II) may interfere with proper TTP regulation and hinder the cell's ability to respond to inflammation.
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Affiliation(s)
- Andrew T Stoltzfus
- Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, Baltimore, MD, 21201, USA
| | - Courtney J Campbell
- Department of Pharmaceutical Sciences, Wayne State University, Detroit, MI, 48201, USA
| | - Madison M Worth
- Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, Baltimore, MD, 21201, USA
| | - Kellie Hom
- Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, Baltimore, MD, 21201, USA
| | - Timothy L Stemmler
- Department of Pharmaceutical Sciences, Wayne State University, Detroit, MI, 48201, USA
| | - Sarah L J Michel
- Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, Baltimore, MD, 21201, USA.
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2
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Maleki F, Shahpiri A. Efficient and specific bioaccumulation of arsenic in the transgenic Escherichia coli expressing ArsR1 from Corynebacterium glutamicum. Biometals 2022; 35:889-901. [PMID: 35767097 DOI: 10.1007/s10534-022-00412-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2021] [Accepted: 06/11/2022] [Indexed: 11/02/2022]
Abstract
The toxic nature of arsenic has left a trail of disastrous health consequences around the world. Microorganisms have developed various strategies to deal with arsenic. The presence of plasmid and chromosomal ars operons is one of the most important mechanisms for the detoxification of arsenic in bacteria. ArsR is a trans-acting regulatory protein and acts as a repressor on ars operon. The gene encoding ArsR from Corynebacterium glutamicum (CgArsR1) was cloned in expression vectors pET28a. The resulting constructs were transformed into Escherichia coli strains Rosetta (DE3) and Rosetta gami 2. Following the induction with Isopropyl β-D-1-thiogalactopyranoside, the protein His-CgArsR1 was found in the soluble fraction of strain Rg-CgArsR1. For comparison, ArsR from E. coli was also overexpressed in E. coli (strain Rosetta gami 2) as His-EcArsR. A strain containing empty vector pET28a was also used as a control strain. In the medium containing either arsenite (0.5 mM) or arsenate (0.5 mM), the strain Rg-CgArsR1 and Rg-EcArsR were able to accumulate 1200 and 700 µg/g DCW As3+, respectively. In comparison, the accumulation of As5+ in these strains was 338 and 232 µg/g DCW, respectively. Whereas both strains Rg-CgArsR1 and Rg-EcArsR were able to accumulate higher amounts of As3+ and As5+ with respect to control strain, the accumulation of arsenic in the strain Rg-CgArsR1 was significantly more efficient than strain Rg-EcArsR for removing As3+ and As5+. Based on the results the gene encoding CgArsR1 is a useful and efficient target gene for the modification of bacteria for bioremediation of arsenic from polluted soil and water.
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Affiliation(s)
- Fatemeh Maleki
- Department of Biotechnology, College of Agriculture, Isfahan University of Technology, 84156-83111, Isfahan, Iran
| | - Azar Shahpiri
- Department of Biotechnology, College of Agriculture, Isfahan University of Technology, 84156-83111, Isfahan, Iran.
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3
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Mikhaylina A, Scott L, Scanlan DJ, Blindauer CA. A metallothionein from an open ocean cyanobacterium removes zinc from the sensor protein controlling its transcription. J Inorg Biochem 2022; 230:111755. [DOI: 10.1016/j.jinorgbio.2022.111755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Revised: 02/05/2022] [Accepted: 02/06/2022] [Indexed: 10/19/2022]
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4
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Malekzadeh R, Shahpiri A, Siapoush S. Metalation of a rice type 1 metallothionein isoform (OsMTI-1b). Protein Expr Purif 2020; 175:105719. [PMID: 32750405 DOI: 10.1016/j.pep.2020.105719] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2020] [Revised: 06/11/2020] [Accepted: 07/25/2020] [Indexed: 11/15/2022]
Abstract
The simultaneously functions of Metallothioneins (MTs) are relied on their metalation mechanisms that can be divided into non-cooperative, weakly cooperative and strongly cooperative mechanisms. In this study, we recombinantly synthesized OsMTI-1b, N- and C-terminal Cys-rich regions as glutathione-S-transferase (GST)-fusion proteins in E. coli. In comparison with control strains (The E. coli cells containing pET41a without gene), transgenic E. coli cells showed more tolerance against Cd2+ and Zn2+. The recombinant GST-proteins were purified using affinity chromatography. According to in vitro assays, the recombinant proteins showed a higher binding ability to Cd2+ and Zn2+. However, the affinity of apo-proteins to Cu2+ ions were very low. The coordination of Cd2+ ions in OsMTI-1b demonstrates a strongly cooperative mechanism with a priority for the C-terminal Cys-rich region that indicates the detoxifying of heavy metals as main role of P1 subfamily of MTs. While the metalation with Zn2+ conformed to a weakly cooperative mechanism with a specificity to N-terminal Cys-rich region. It implies the specific function of OsMTI-1b is involved in zinc homeostasis. Nevertheless, a non-cooperative metalation mechanism was perceived for Cu2+ that suggests the fully metalation does not occur and OsMTI-1b cannot play a significant role in dealing with Cu2+ ions.
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Affiliation(s)
- Rahim Malekzadeh
- Department of Medical Biotechnology, School of Advanced Technologies, Shahrekord University of Medical Sciences, Shahrekord, 88157-13471, Iran; Student Research Committee, Shahrekord University of Medical Sciences, Shahrekord, Iran.
| | - Azar Shahpiri
- Department of Biotechnology, College of Agriculture, Isfahan University of Technology, Isfahan, 84156-83111, Iran
| | - Samaneh Siapoush
- Department of Medical Biotechnology, Faculty of Advanced Medical Sciences, Tabriz University of Medical Science, Tabriz, 51664-15731, Iran
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5
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Yen Le TT, García MR, Grabner D, Nachev M, Balsa-Canto E, Hendriks AJ, Zimmermann S, Sures B. Mechanistic simulation of bioconcentration kinetics of waterborne Cd, Ag, Pd, and Pt in the zebra mussel Dreissena polymorpha. CHEMOSPHERE 2020; 242:124967. [PMID: 31677506 DOI: 10.1016/j.chemosphere.2019.124967] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2019] [Revised: 09/17/2019] [Accepted: 09/24/2019] [Indexed: 05/21/2023]
Abstract
Mechanistic models based on chemical properties of metals and body size have received substantial attention for their potential application to various metals and to different conditions without required calibration. This advantage has been demonstrated for a number of metals, such as Cd and Ag. However, the capacity of metal-specific chemical properties to explain variations in the accumulation for platinum-group elements (PGEs) has not been investigated yet, although emission of these metals is of increasing concern. Once being released, PGEs exist in the environment in mixtures with other metals. The present study attempted to model the accumulation of Pd and Pt in mixtures with Ag and Cd in the zebra mussel (Dreissena polymorpha) from the aqueous phase; and to investigate the potential application of mechanistic models to Pd and Pt. The present study showed statistically insignificant differences in metal accumulation among size groups in a narrow range of shell length (16-22 mm). Kinetic models could simulate well the accumulation of Cd, Ag, and Pt when metal-specific responses of zebra mussels are taken into consideration. These responses include enhanced immobilisation as a detoxifying mechanism and exchange between soft tissues and shells via the extrapallial fluid. Environmental conditions, e.g. the presence of abiotic ligands such as chloride, might also play an important role in metal accumulation. Significant relationships between the absorption efficiency and the covalent index indicate the potential application of mechanistic models based on this chemical property to Pt.
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Affiliation(s)
- T T Yen Le
- Department of Aquatic Ecology and Centre for Water and Environmental Research (ZWU), University of Duisburg-Essen, Essen, D-45141, Germany.
| | - Míriam R García
- Process Engineering Group, Spanish Council for Scientific Research, IIM-CSIC, Vigo, 36208, Spain
| | - Daniel Grabner
- Department of Aquatic Ecology and Centre for Water and Environmental Research (ZWU), University of Duisburg-Essen, Essen, D-45141, Germany
| | - Milen Nachev
- Department of Aquatic Ecology and Centre for Water and Environmental Research (ZWU), University of Duisburg-Essen, Essen, D-45141, Germany
| | - Eva Balsa-Canto
- Process Engineering Group, Spanish Council for Scientific Research, IIM-CSIC, Vigo, 36208, Spain
| | - A Jan Hendriks
- Department of Environmental Science, Faculty of Science, Radboud University Nijmegen, Nijmegen, 6525, HP, the Netherlands
| | - Sonja Zimmermann
- Department of Aquatic Ecology and Centre for Water and Environmental Research (ZWU), University of Duisburg-Essen, Essen, D-45141, Germany
| | - Bernd Sures
- Department of Aquatic Ecology and Centre for Water and Environmental Research (ZWU), University of Duisburg-Essen, Essen, D-45141, Germany
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Chan S, Wang R, Man K, Nicholls J, Li H, Sun H, Chan GCF. A Novel Synthetic Compound, Bismuth Zinc Citrate, Could Potentially Reduce Cisplatin-Induced Toxicity Without Compromising the Anticancer Effect Through Enhanced Expression of Antioxidant Protein. Transl Oncol 2019; 12:788-799. [PMID: 30921749 PMCID: PMC6438849 DOI: 10.1016/j.tranon.2019.02.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Revised: 02/14/2019] [Accepted: 02/14/2019] [Indexed: 02/07/2023] Open
Abstract
Cisplatin is a common anticancer drug, but it comes with significant nephrotoxicity. Further cisplatin-induced oxidative stress contributes to the pathogenesis of the nephrotoxicity. A new compound, BiZn, can potentially prevent this complication. We verified our postulation by in vitro and in vivo models. From our findings, BiZn did not affect cisplatin-induced cytotoxicity on neuroblastoma cells under both in vitro and in vivo settings. However, BiZn significantly reduced the blood urea nitrogen and creatinine levels in cisplatin-treated mice. Under the lethal dosage of cisplatin, co-treatment of BiZn significantly increased the survival rate. BiZn stimulated antioxidant proteins metallothionein (MT) and glutathione (GSH) generation from kidney cells and minimized cisplatin-induced apoptosis. Knocking down MT-IIA and inhibiting GSH abolished such protection. In conclusion, pretreatment of BiZn decreased cisplatin-induced renal toxicity without affecting its antitumor activity. BiZn-induced antioxidant proteins MT and GSH may contribute to the renal protection effect.
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Affiliation(s)
- Shing Chan
- Department of Paediatrics & Adolescent Medicine, LKS Faculty of Medicine, The University of Hong Kong
| | - Runming Wang
- Department of Chemistry, Faculty of Science, The University of Hong Kong
| | - Kwan Man
- Department of Surgery, LKS Faculty of Medicine, The University of Hong Kong
| | - John Nicholls
- Department of Pathology, LKS Faculty of Medicine, The University of Hong Kong
| | - Hongyan Li
- Department of Chemistry, Faculty of Science, The University of Hong Kong
| | - Hongzhe Sun
- Department of Chemistry, Faculty of Science, The University of Hong Kong.
| | - Godfrey Chi-Fung Chan
- Department of Paediatrics & Adolescent Medicine, LKS Faculty of Medicine, The University of Hong Kong.
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7
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Wong DL, Stillman MJ. Metallothionein: An Aggressive Scavenger-The Metabolism of Rhodium(II) Tetraacetate (Rh 2(CH 3CO 2) 4). ACS OMEGA 2018; 3:16314-16327. [PMID: 31458267 PMCID: PMC6643557 DOI: 10.1021/acsomega.8b02161] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Accepted: 11/13/2018] [Indexed: 06/10/2023]
Abstract
Anthropogenic sources of xenobiotic metals with no physiological benefit are increasingly prevalent in the environment. The platinum group metals (Pd, Pt, Rh, Ru, Os, and Ir) are found in marine and plant species near urban sources, and are known to bioaccumulate, introducing these metals into the human food chain. Many of these metals are also being used in innovative cancer therapy, which leads to a direct source of exposure for humans. This paper aims to further our understanding of nontraditional metal metabolism via metallothionein, a protein involved in physiologically important metal homeostasis. The aggressive reaction of metallothionein and dirhodium(II) tetraacetate, a common synthetic catalyst known for its cytotoxicity, was studied in detail in vitro. Optical spectroscopic and equilibrium and time-dependent mass spectral data were used to define binding constants for this robust reaction, and molecular dynamics calculations were conducted to explain the observed results.
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Affiliation(s)
- Daisy L. Wong
- Department of Chemistry, The
University of Western Ontario, 1151 Richmond Street, N6A 5B7 London, Ontario, Canada
| | - Martin J. Stillman
- Department of Chemistry, The
University of Western Ontario, 1151 Richmond Street, N6A 5B7 London, Ontario, Canada
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8
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Scheller JS, Irvine GW, Stillman MJ. Unravelling the mechanistic details of metal binding to mammalian metallothioneins from stoichiometric, kinetic, and binding affinity data. Dalton Trans 2018; 47:3613-3637. [PMID: 29431781 DOI: 10.1039/c7dt03319b] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Metallothioneins (MTs) are small, cysteine-rich proteins, found throughout Nature. Their ability to bind a number of different metals with a range of stoichiometric ratios means that this protein family is critically important for essential metal (Zn2+ and Cu+) homeostasis, metal storage, metal donation to nascent metalloenzymes as well as heavy metal detoxification. With its 20 cysteines, metallothionein is also considered to protect cells against oxidative stress. MT has been studied by a large number of researchers over the last 6 decades using a variety of spectroscopic techniques. The lack of distinguishing chromophores for the multitude of binding sites has made the evaluation of stoichiometric properties for different metals challenging. Initially, only 113Cd-NMR spectroscopy could provide strong evidence for the proposed cluster formation of Cd-MT. The extraordinary development of electrospray ionization mass spectrometry (ESI-MS), where all coexisting species in solution are observed, revolutionized MT research. Prior to the use of ESI-MS data, a range of "magic numbers" representing metal-to-MT molar ratios were reported from optical spectroscopic studies. The availability of ESI mass spectral data led to (i) the confirmation of cluster formation, (ii) a conceptual understanding of the cooperativity involved in multiple metal binding events, (iii) the presence of domain specificity between regions of the protein and (iv) mechanistic details involving both binding affinities and rate constants. The kinetic experiments identified the presence of multiple individual binding sites, each with a unique rate constant and an analogous binding affinity. The almost linear trend in rate constants as a function of bound As3+ provided a unique insight that became a critical step in the complete understanding of the mechanistic details of the metalation of MT. To fully define the biological function of this sulfur-rich protein it is necessary to determine kinetic rate constants and binding affinities for the essential metals. Recently, Zn2+ competition experiments between both of the isolated fragments (α and β) and the full-length protein (βα-MT 1a) as well as Zn2+ competition between βα-MT 1a and carbonic anhydrase were reported. From these data, the trend in binding affinities and the values of the Kf of the 7 bimolecular reactions involved in metalation were determined. From the analysis of ESI-MS data for Cu+ binding to βα-MT 1a at different pH-values, a trend in the 20 binding affinities for the complete metalation mechanism was reported. This review details a personal view of the historical development of the determination of stoichiometry for metal binding, the structure of the binding sites, the rates of the metalation reactions and the underlying binding affinities for each metalation step. We have attempted to summarize the experimental developments that led to the publication in May 2017 of the experimental determination of the 20 binding constants for the 20 sequential bimolecular reactions for Cu+ binding to the 20 Cys of apoMT as a function of pH that show the appearance and disappearance of clusters. We report both published data and in a series of tables an assembly of stoichiometries, and equilibrium constants for Zn2+ and Cu+ for many different metallothioneins.
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Affiliation(s)
- Judith S Scheller
- Department of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada.
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9
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Ziller A, Fraissinet-Tachet L. Metallothionein diversity and distribution in the tree of life: a multifunctional protein. Metallomics 2018; 10:1549-1559. [DOI: 10.1039/c8mt00165k] [Citation(s) in RCA: 71] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Metallothioneins are diverse, but not represented yet in all phyla. Moreover, they play a central role as a [MT:T:TO] protein system.
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Affiliation(s)
- Antoine Ziller
- Microbial Ecology
- CNRS UMR 5557
- UMR INRA 1418
- Université Lyon1
- Université de Lyon
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10
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Abstract
Metallothioneins (MTs) are low molecular weight ubiquitous metalloproteins with high cysteine (thiol) content. The intracellular concentration of zinc (Zn) is tightly regulated and MT plays a crucial role in it. The present study investigates the relationship between the Zn status (as a function of Zn concentration and time) in the rat liver and the occurrence of hepatic MT. For dose dependent study, four experimental groups, one control and three receiving different levels of metal supplementation, were chosen [Group 1 control and Group 2, Group 3, Group 4 receiving subcutaneous dose of 10, 50 and 100 mg of Zn/kg body weight (in the form of ZnSO4·7H2O), respectively]. For the time dependent expression of MT, again four experimental groups, i.e. Group 5 control and Group 6, Group 7, Group 8 receiving 50 mg of Zn/kg body weight (in the form of ZnSO4·7H2O) subcutaneously and sacrificed at different time intervals after last injection i.e. 6, 18, 48 h, respectively were chosen. Isolation of MT was done by using combination of gel filtration and ion exchange chromatography while characterization of MT fraction was carried in the wavelength range 200-400 nm. Expression of MT was studied by using Western blot analysis. The results revealed that the MT expression increases with increasing the dose of Zn administered and maximum at 18 h after last Zn injection. Accumulation of MT with increase dose would help in maintaining the intracellular Zn concentration by its sequestration which further reduces the possibility of undesirable binding of Zn to other proteins significantly and maintains Zn homeostasis. The maximum expression of MT at 18 h is indicative of its half life.
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Carpenter MC, Shami Shah A, DeSilva S, Gleaton A, Su A, Goundie B, Croteau ML, Stevenson MJ, Wilcox DE, Austin RN. Thermodynamics of Pb(ii) and Zn(ii) binding to MT-3, a neurologically important metallothionein. Metallomics 2017; 8:605-17. [PMID: 26757944 DOI: 10.1039/c5mt00209e] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Isothermal titration calorimetry (ITC) was used to quantify the thermodynamics of Pb(2+) and Zn(2+) binding to metallothionein-3 (MT-3). Pb(2+) binds to zinc-replete Zn7MT-3 displacing each zinc ion with a similar change in free energy (ΔG) and enthalpy (ΔH). EDTA chelation measurements of Zn7MT-3 and Pb7MT-3 reveal that both metal ions are extracted in a tri-phasic process, indicating that they bind to the protein in three populations with different binding thermodynamics. Metal binding is entropically favoured, with an enthalpic penalty that reflects the enthalpic cost of cysteine deprotonation accompanying thiolate ligation of the metal ions. These data indicate that Pb(2+) binding to both apo MT-3 and Zn7MT-3 is thermodynamically favourable, and implicate MT-3 in neuronal lead biochemistry.
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Affiliation(s)
- M C Carpenter
- Department of Chemistry, Dartmouth College, Hanover, NH 03755, USA.
| | - A Shami Shah
- Department of Chemistry, Bates College, Lewiston, ME 04240, USA
| | - S DeSilva
- Department of Chemistry, Bates College, Lewiston, ME 04240, USA
| | - A Gleaton
- Department of Chemistry, Bates College, Lewiston, ME 04240, USA
| | - A Su
- Department of Chemistry, Bates College, Lewiston, ME 04240, USA
| | - B Goundie
- Department of Chemistry, Bates College, Lewiston, ME 04240, USA
| | - M L Croteau
- Department of Chemistry, Dartmouth College, Hanover, NH 03755, USA.
| | - M J Stevenson
- Department of Chemistry, Dartmouth College, Hanover, NH 03755, USA.
| | - D E Wilcox
- Department of Chemistry, Dartmouth College, Hanover, NH 03755, USA.
| | - R N Austin
- Department of Chemistry, Bates College, Lewiston, ME 04240, USA and Department of Chemistry, Barnard College, Columbia University, NY, NY 10027, USA.
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12
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Falfushynska H, Gnatyshyna L, Horyn O, Sokolova I, Stoliar O. Endocrine and cellular stress effects of zinc oxide nanoparticles and nifedipine in marsh frogs Pelophylax ridibundus. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2017; 185:171-182. [PMID: 28226256 DOI: 10.1016/j.aquatox.2017.02.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Revised: 12/02/2016] [Accepted: 02/07/2017] [Indexed: 06/06/2023]
Abstract
Freshwater organisms including amphibians experience increasing exposures to emerging pollutants such as nanoparticles and pharmaceuticals, which can affect their fitness and performance. We studied the effects of two common pollutants extensively used in industry, pharmaceutical and personal care products, nano-zinc oxide (nZnO) and a Ca-channel blocker nifedipine (Nfd), on endocrine status and cellular stress markers of the marsh frog Pelophylax ridibundus. Males were exposed for 14days to nZnO (3.1μM), Zn2+ (3.1μM, as a positive control for nZnO exposures), Nfd (10μM), and combination of nZnO and Nfd (nZnO+Nfd). Exposure to nZnO and Zn2+ led to an increase in Zn burdens, elevated concentrations of the metal-bound metallothioneins (MT-Me) in the liver and increased vitellogenin in the serum, whereas exposures to Nfd and nZnO+Nfd resulted in the metal release from MTs and a significant increase in the ratio of total to metal-bound MTs. This likely reflects oxidative stress caused by Nfd exposures as manifested in the elevated levels of oxyradical production, upregulation of superoxide dismutase activity (SOD) and increase in the total and oxidized glutathione concentrations in Nfd-exposed frogs. Zn-containing exposures upregulated activity of deiodinase (in nZnO and nZnO+Nfd exposures) and serum thyrotropin level (in the case of Zn2+). All exposures caused an increase in DNA fragmentation, lipofuscin accumulation as well as upregulation of caspase-3 and CYP450 levels reflecting cytotoxicity of the studied compounds in the liver. Across all experimental treatments, nZnO exposures in the absence of Nfd had the least impact on the cellular stress traits or redox status in frogs. This indicates that at the low environmentally relevant levels of pollution, pharmaceuticals such as Nfd and free metals (such as Zn2+) may represent a stronger threat to the health of the frogs than nZnO particles.
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Affiliation(s)
- Halina Falfushynska
- Research Laboratory of Comparative Biochemistry and Molecular Biology, Ternopil National Pedagogical University, Kryvonosa Str 2, 46027, Ternopil, Ukraine; I.Ya. Horbachevsky Ternopil State Medical University, Maydan Voli, 1, 46001, Ternopil, Ukraine
| | - Lesya Gnatyshyna
- Research Laboratory of Comparative Biochemistry and Molecular Biology, Ternopil National Pedagogical University, Kryvonosa Str 2, 46027, Ternopil, Ukraine; I.Ya. Horbachevsky Ternopil State Medical University, Maydan Voli, 1, 46001, Ternopil, Ukraine
| | - Oksana Horyn
- I.Ya. Horbachevsky Ternopil State Medical University, Maydan Voli, 1, 46001, Ternopil, Ukraine
| | - Inna Sokolova
- Marine Biology, Institute for Biological Sciences, University of Rostock, Albert-Einstein Str., 3, Rostock, Germany
| | - Oksana Stoliar
- Research Laboratory of Comparative Biochemistry and Molecular Biology, Ternopil National Pedagogical University, Kryvonosa Str 2, 46027, Ternopil, Ukraine.
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Prevention of gastrointestinal lead poisoning using recombinant Lactococcus lactis expressing human metallothionein-I fusion protein. Sci Rep 2016; 6:23716. [PMID: 27045906 PMCID: PMC4820694 DOI: 10.1038/srep23716] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2015] [Accepted: 03/11/2016] [Indexed: 12/15/2022] Open
Abstract
Low-level lead poisoning is an insidious disease that affects millions of children worldwide, leading to biochemical and neurological dysfunctions. Blocking lead uptake via the gastrointestinal tract is an important prevention strategy. With this in mind, we constructed the recombinant Lactococcus lactis strain pGSMT/MG1363, which constitutively expressed the fusion protein glutathione S-transferase (GST)–small molecule ubiquitin-like modifier protein (SUMO)–metallothionein-I (GST-SUMO-MT). The thermodynamic data indicated that the average number of lead bound to a GST-SUMO-MT molecule was 3.655 and this binding reaction was a spontaneous, exothermic and entropy-increasing process. The total lead-binding capacity of pGSMT/MG1363 was 4.11 ± 0.15 mg/g dry mass. Oral administration of pGSMT/MG1363 (1 × 1010 Colony-Forming Units) to pubertal male rats that were also treated with 5 mg/kg of lead acetate daily significantly inhibited the increase of blood lead levels, the impairment of hepatic function and the decrease of testosterone concentration in the serum, which were all impaired in rats treated by lead acetate alone. Moreover, the administration of pGSMT/MG1363 for 6 weeks did not affect the serum concentration of calcium, magnesium, potassium or sodium ions. This study provides a convenient and economical biomaterial for preventing lead poisoning via the digestive tract.
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Rosabal M, Mounicou S, Hare L, Campbell PGC. Metal (Ag, Cd, Cu, Ni, Tl, and Zn) Binding to Cytosolic Biomolecules in Field-Collected Larvae of the Insect Chaoborus. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:3247-3255. [PMID: 26886407 DOI: 10.1021/acs.est.5b05961] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We characterized the biomolecules involved in handling cytosolic metals in larvae of the phantom midge (Chaoborus) collected from five mining-impacted lakes by determining the distribution of Ag, Cd, Cu, Ni, Tl, and Zn among pools of various molecular weights (HMW: high molecular weight, >670-40 kDa; MMW: medium molecular weight, 40-<1.3 kDa; LMW: low molecular weight, <1.3 kDa). Appreciable concentrations of nonessential metals were found in the potentially metal-sensitive HMW (Ag and Ni) and LMW (Tl) pools, whereas the MMW pool, which includes metallothioneins (MTs) and metallothionein-like proteins and peptides (MTLPs), appears to be involved in Ag and Cd detoxification. Higher-resolution fractionation of the heat-stable protein (HSP) fraction revealed further differences in the partitioning of nonessential metals (i.e., Ag = Cd ≠ Ni ≠ Tl). These results provide unprecedented details about the metal-handling strategies employed by a metal-tolerant, freshwater animal in a field situation.
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Affiliation(s)
- Maikel Rosabal
- Institut National de la Recherche Scientifique - Centre Eau Terre Environnement (INRS-ETE) , 490 de la Couronne, Quebec City, Quebec, G1K 9A9 Canada
| | - Sandra Mounicou
- CNRS/UPPA, Laboratoire de Chimie Analytique Bio-Inorganique et Environnement UMR 5254 , Hélioparc, 2. Av. Pr. Angot, Pau, 64053 France
| | - Landis Hare
- Institut National de la Recherche Scientifique - Centre Eau Terre Environnement (INRS-ETE) , 490 de la Couronne, Quebec City, Quebec, G1K 9A9 Canada
| | - Peter G C Campbell
- Institut National de la Recherche Scientifique - Centre Eau Terre Environnement (INRS-ETE) , 490 de la Couronne, Quebec City, Quebec, G1K 9A9 Canada
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15
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Klaren WD, Flor S, Gibson-Corley KN, Ludewig G, Robertson LW. Metallothionein's role in PCB126 induced hepatotoxicity and hepatic micronutrient disruption. Toxicol Rep 2016; 3:21-28. [PMID: 26770886 PMCID: PMC4710377 DOI: 10.1016/j.toxrep.2015.12.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
Polychlorinated biphenyls (PCBs), industrial chemicals and persistent environmental pollutants, are found in rural and urban settings. Rodent studies have shown that exposure to PCB126, a dioxin-like PCB, causes a significant disruption of hepatic micronutrient homeostasis and an increase in metallothionein (MT), an antioxidant protein and metal carrier. A MT knockout mouse strain was used to assess metallothionein’s role in micronutrient disruption and overall hepatotoxicity. Twenty four 129S male mice (12 wild type (WT) and 12 MT knockout (MTKO)) were placed on a purified diet (AIN-93G) for 3 weeks to achieve hepatic metal equilibrium. Mice were then given a single IP injection of either vehicle or 150 μmol/kg PCB126 in vehicle. The animals were sacrificed 2 weeks later and organs processed for analysis. Liver histology, hepatic lipids, gene expression, micronutrient and ROS status were investigated. Liver weights, liver lipids, ROS, and hepatocyte vacuolation were increased with PCB126 exposure along with AhR responsive genes. The MTKO animals had more severe histological changes in the liver and elevated liver lipids than their wild type counterparts. Hepatic and renal metals levels (Cu, Zn, Se and Mn) were mostly reduced by PCB126 treatment. Renal micronutrients were more affected by PCB126 treatment in the MTKO animals. This research suggests that MT may not be the sole/primary cause of the metal disruption caused by PCB126 exposure in mice, but may provide protection against overall hepatotoxicity.
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Affiliation(s)
- W D Klaren
- Interdisciplinary Graduate Program in Human Toxicology, University of Iowa, Iowa City, Iowa; Department of Occupational and Environmental Health, College of Public Health, University of Iowa, Iowa City, Iowa
| | - S Flor
- Department of Occupational and Environmental Health, College of Public Health, University of Iowa, Iowa City, Iowa
| | | | - G Ludewig
- Interdisciplinary Graduate Program in Human Toxicology, University of Iowa, Iowa City, Iowa; Department of Occupational and Environmental Health, College of Public Health, University of Iowa, Iowa City, Iowa
| | - L W Robertson
- Interdisciplinary Graduate Program in Human Toxicology, University of Iowa, Iowa City, Iowa; Department of Occupational and Environmental Health, College of Public Health, University of Iowa, Iowa City, Iowa
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16
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Dziegiel P, Pula B, Kobierzycki C, Stasiolek M, Podhorska-Okolow M. Metallothioneins: Structure and Functions. METALLOTHIONEINS IN NORMAL AND CANCER CELLS 2016. [DOI: 10.1007/978-3-319-27472-0_2] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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17
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Rubino FM. Toxicity of Glutathione-Binding Metals: A Review of Targets and Mechanisms. TOXICS 2015; 3:20-62. [PMID: 29056650 PMCID: PMC5634692 DOI: 10.3390/toxics3010020] [Citation(s) in RCA: 93] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Revised: 09/04/2014] [Accepted: 01/14/2015] [Indexed: 02/07/2023]
Abstract
Mercury, cadmium, arsenic and lead are among priority metals for toxicological studies due to the frequent human exposure and to the significant burden of disease following acute and chronic intoxication. Among their common characteristics is chemical affinity to proteins and non-protein thiols and their ability to generate cellular oxidative stress by the best-known Fenton mechanism. Their health effects are however diverse: kidney and liver damage, cancer at specific sites, irreversible neurological damages with metal-specific features. Mechanisms for the induction of oxidative stress by interaction with the cell thiolome will be presented, based on literature evidence and of experimental findings.
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Affiliation(s)
- Federico Maria Rubino
- LaTMA Laboratory for Analytical Toxicology and Metabonomics, Department of Health Sciences, Università degli Studi di Milano at "Ospedale San Paolo" v. A. di Rudinì 8, I-20142 Milano, Italy.
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18
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Zheng L, Li X, Liu P, Wu G, Lu X, Liu X. Simultaneous detection of multiple DNA targets based on encoding metal ions. Biosens Bioelectron 2014; 52:354-9. [DOI: 10.1016/j.bios.2013.09.008] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2013] [Revised: 08/07/2013] [Accepted: 09/04/2013] [Indexed: 10/26/2022]
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Affiliation(s)
- Shengwen Shen
- Department
of Laboratory Medicine
and Pathology, 10-102 Clinical Sciences Building, University
of Alberta, Edmonton, Alberta, Canada, T6G 2G3
| | - Xing-Fang Li
- Department
of Laboratory Medicine
and Pathology, 10-102 Clinical Sciences Building, University
of Alberta, Edmonton, Alberta, Canada, T6G 2G3
| | - William R. Cullen
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver,
British Columbia, Canada, V6T 1Z1
| | - Michael Weinfeld
- Department of Oncology, Cross
Cancer Institute, University of Alberta, 11560 University Avenue, Edmonton, Alberta, Canada, T6G 1Z2
| | - X. Chris Le
- Department
of Laboratory Medicine
and Pathology, 10-102 Clinical Sciences Building, University
of Alberta, Edmonton, Alberta, Canada, T6G 2G3
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Jancsó A, Gyurcsik B, Mesterházy E, Berkecz R. Competition of zinc(II) with cadmium(II) or mercury(II) in binding to a 12-mer peptide. J Inorg Biochem 2013; 126:96-103. [PMID: 23796441 DOI: 10.1016/j.jinorgbio.2013.05.019] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2013] [Revised: 05/29/2013] [Accepted: 05/29/2013] [Indexed: 11/15/2022]
Abstract
Speciation of the complexes of zinc(II) with a dodecapeptide (Ac-SCPGDQGSDCSI-NH2), inspired by the metal binding domain of MerR metalloregulatory proteins, have been studied by pH-potentiometric titrations, UV, SRCD (synchrotron radiation circular dichroism) and (1)H NMR experiments. (MerR is a family of transcriptional regulators the archetype of which is the Hg(2+)-responsive transcriptional repressor-activator MerR protein.) The aim of the ligand-design was to retain the advantageous metal binding features of MerR proteins in a model peptide for the efficient capture of toxic metal ions. The peptide binds zinc(II) via two deprotonated Cys-thiol groups and one of the Asp-carboxylates in the ZnL parent complex, possessing a remarkably high stability (logK=9.93). In spite of the relatively long peptide loop, bis-complexes are also formed with the metal ion under basic conditions. In a competition with cadmium(II) or mercury(II), zinc(II) cannot prevent the binding of toxic metal ions by the thiolate donor groups of the ligand. Around neutral pH one equivalent of mercury(II) was shown to fully replace zinc(II) from the ZnL species. Partial replacement of zinc(II) from the peptide by one equivalent of cadmium(II), relative to zinc(II) and the ligand, is also presumable, nevertheless, spectroscopic data may suggest the formation of mixed metal ion complexes, as well. Based on the obtained results the investigated dodecapeptide can be a promising candidate for capturing toxic metal ions in practical applications.
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Affiliation(s)
- Attila Jancsó
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, Szeged H-6720, Hungary.
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Slyemi D, Bonnefoy V. How prokaryotes deal with arsenic(†). ENVIRONMENTAL MICROBIOLOGY REPORTS 2012; 4:571-586. [PMID: 23760928 DOI: 10.1111/j.1758-2229.2011.00300.x] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Arsenic is a notorious poison classified as a carcinogen, a teratogen and a clastogen that ranks number one on the Environmental Protection Agency's priority list of drinking water contaminants. It is ubiquitous and relatively abundant in the Earth's crust. Its mobilization in waters by weathering, volcanic, anthropogenic or biological activities represents a major hazard to public health, exemplified in India and Bangladesh where 50 million people are acutely at risk. Since basically the origin of life, microorganisms have been exposed to this toxic compound and have evolved a variety of resistance mechanisms, such as extracellular precipitation, chelation, intracellular sequestration, active extrusion from the cell or biochemical transformation (redox or methylation). Arsenic efflux systems are widespread and are found in nearly all organisms. Some microorganisms are also able to utilize this metalloid as a metabolic energy source through either arsenite oxidation or arsenate reduction. The energy metabolism involving redox reactions of arsenic has been suggested to have evolved during early life on Earth. This review highlights the different systems evolved by prokaryotes to cope with arsenic and how they participate in its biogeochemical cycle.
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Affiliation(s)
- Djamila Slyemi
- Laboratoire de Chimie Bactérienne, UPR-CNRS 9043, Institut de Microbiologie de la Méditerranée, 31 chemin Joseph Aiguier, 13402, Marseille, Cedex 20, France. Aix-Marseille Université, Marseille, France
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22
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Babula P, Masarik M, Adam V, Eckschlager T, Stiborova M, Trnkova L, Skutkova H, Provaznik I, Hubalek J, Kizek R. Mammalian metallothioneins: properties and functions. Metallomics 2012; 4:739-50. [PMID: 22791193 DOI: 10.1039/c2mt20081c] [Citation(s) in RCA: 172] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Metallothioneins (MT) are a family of ubiquitous proteins, whose role is still discussed in numerous papers, but their affinity to some metal ions is undisputable. These cysteine-rich proteins are connected with antioxidant activity and protective effects on biomolecules against free radicals, especially reactive oxygen species. In this review, the connection between zinc(II) ions, reactive oxygen species, heavy metal ions and metallothioneins is demonstrated with respect to effect of these proteins on cell proliferation and a possible negative role in resistance to heavy metal-based and non-heavy metal-based drugs.
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Affiliation(s)
- Petr Babula
- Central European Institute of Technology, Brno University of Technology, Technicka 3058/10, CZ-616 00 Brno, Czech Republic
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Capdevila M, Bofill R, Palacios Ò, Atrian S. State-of-the-art of metallothioneins at the beginning of the 21st century. Coord Chem Rev 2012. [DOI: 10.1016/j.ccr.2011.07.006] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Carlton DD, Schug KA. A review on the interrogation of peptide–metal interactions using electrospray ionization-mass spectrometry. Anal Chim Acta 2011; 686:19-39. [DOI: 10.1016/j.aca.2010.11.050] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2010] [Revised: 11/24/2010] [Accepted: 11/25/2010] [Indexed: 11/27/2022]
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25
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Fu Z, Guo J, Jing L, Li R, Zhang T, Peng S. Enhanced toxicity and ROS generation by doxorubicin in primary cultures of cardiomyocytes from neonatal metallothionein-I/II null mice. Toxicol In Vitro 2010; 24:1584-91. [PMID: 20600803 DOI: 10.1016/j.tiv.2010.06.009] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2010] [Revised: 06/02/2010] [Accepted: 06/17/2010] [Indexed: 11/30/2022]
Abstract
The clinical use of doxorubicin (Dox), a potent anticancer drug, is limited by its concurrent dose-dependent cardiotoxicity. We previously found that metallothionein-I/II (MT-I/II) null mice are more vulnerable to Dox-induced cardiomyopathy, but it is unknown whether depletion of MT would sensitize cardiomyocytes to Dox toxicity in vitro since the protective effect of MT still remains controversial. In the present study, a primary culture system of cardiomyocytes from neonatal MT-I/II null (MT(-/-)) and corresponding wild type (MT(+/+)) mice was established to unequivocally determine the effect of MT deficiency on Dox-induced toxicity. MT concentrations in the MT(-/-) cardiomyocytes were about 2.5-fold lower than those in MT(+/+) cardiomyocytes. MT(-/-) cardiomyocytes were more sensitive to Dox-induced cytotoxicity than MT(+/+) cardiomyocytes as measured by morphological alterations, lactate dehydrogenase leakage, cell viability, and apoptosis. Dox time- and concentration-dependently increased reactive oxygen species (ROS) formation in MT(+/+) cardiomyocytes, and this effect was exaggerated in MT(-/-) cardiomyocytes. Antioxidant N-acetylcysteine (NAC) and glutathione (GSH) significantly rescued MT(+/+) but not MT(-/-)cardiomyocytes from Dox-induced cell death and ROS generation. These findings suggest that basal MT provide protection against Dox-induced toxicity in cardiomyocytes, particularly highlight the important role of MT as a cellular antioxidant on scavenging ROS.
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Affiliation(s)
- Ze Fu
- Evaluation and Research Centre for Toxicology, Institute of Disease Control and Prevention, Academy of Military Medical Sciences, Fengtai District, Beijing, PR China
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Blindauer CA, Leszczyszyn OI. Metallothioneins: unparalleled diversity in structures and functions for metal ion homeostasis and more. Nat Prod Rep 2010; 27:720-41. [PMID: 20442962 DOI: 10.1039/b906685n] [Citation(s) in RCA: 144] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Metallothioneins have been the subject of intense study for five decades, and have greatly inspired the development of bio-analytical methodologies including multi-dimensional and multi-nuclear NMR.With further advancements in molecular biology, protein science, and instrumental techniques, recent years have seen a renaissance of research into metallothioneins. The current report focuses on in vitro studies of so-called class II metallothioneins from a variety of phyla, highlighting the diversity of metallothioneins in terms of structure, biological functions, and molecular functions such as metal ion specificity, thermodynamic stabilities, and kinetic reactivity. We are still far from being able to predict any of these properties, and further efforts will be required to generate the knowledge that will enable a better understanding of what governs the biological and chemical properties of these unusual and intriguing small proteins.
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Jensen KP, Rykær M. The building blocks of metallothioneins: heterometallic Zn2+ and Cd2+ clusters from first-principles calculations. Dalton Trans 2010; 39:9684-95. [DOI: 10.1039/c0dt00087f] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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