51
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Copper Redox Cycling Inhibits Aβ Fibre Formation and Promotes Fibre Fragmentation, while Generating a Dityrosine Aβ Dimer. Sci Rep 2018; 8:16190. [PMID: 30385800 PMCID: PMC6212427 DOI: 10.1038/s41598-018-33935-5] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2018] [Accepted: 10/04/2018] [Indexed: 12/22/2022] Open
Abstract
Oxidative stress and the formation of plaques which contain amyloid-β (Aβ) peptides are two key hallmarks of Alzheimer’s disease (AD). Dityrosine is found in the plaques of AD patients and Aβ dimers have been linked to neurotoxicity. Here we investigate the formation of Aβ dityrosine dimers promoted by Cu2+/+ Fenton reactions. Using fluorescence measurements and UV absorbance, we show that dityrosine can be formed aerobically when Aβ is incubated with Cu2+ and hydrogen-peroxide, or in a Cu2+ and ascorbate redox mixture. The dityrosine cross-linking can occur for both monomeric and fibrillar forms of Aβ. We show that oxidative modification of Aβ impedes the ability for Aβ monomer to form fibres, as indicated by the amyloid specific dye Thioflavin T (ThT). Transmission electron microscopy (TEM) indicates the limited amyloid assemblies that form have a marked reduction in fibre length for Aβ(1–40). Importantly, the addition of Cu2+ and a reductant to preformed Aβ(1–40) fibers causes their widespread fragmentation, reducing median fibre lengths from 800 nm to 150 nm upon oxidation. The processes of covalent cross-linking of Aβ fibres, dimer formation, and fibre fragmentation within plaques are likely to have a significant impact on Aβ clearance and neurotoxicity.
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52
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Atrián-Blasco E, Gonzalez P, Santoro A, Alies B, Faller P, Hureau C. Cu and Zn coordination to amyloid peptides: From fascinating chemistry to debated pathological relevance. Coord Chem Rev 2018; 375:38-55. [PMID: 30262932 DOI: 10.1016/j.ccr.2018.04.007] [Citation(s) in RCA: 114] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Several diseases share misfolding of different peptides and proteins as a key feature for their development. This is the case of important neurodegenerative diseases such as Alzheimer's and Parkinson's diseases and type II diabetes mellitus. Even more, metal ions such as copper and zinc might play an important role upon interaction with amyloidogenic peptides and proteins, which could impact their aggregation and toxicity abilities. In this review, the different coordination modes proposed for copper and zinc with amyloid-β, α-synuclein and IAPP will be reviewed as well as their impact on the aggregation, and ROS production in the case of copper. In addition, a special focus will be given to the mutations that affect metal binding and lead to familial cases of the diseases. Different modifications of the peptides that have been observed in vivo and could be relevant for the coordination of metal ions are also described.
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Affiliation(s)
- Elena Atrián-Blasco
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, BP 44099 31077 Toulouse Cedex 4, France
- University of Toulouse, UPS, INPT, 31077 Toulouse Cedex 4, France
| | - Paulina Gonzalez
- Biometals and Biology Chemistry, Institut de Chimie (CNRS UMR7177), Université de Strasbourg, 4 rue B. Pascal, 67081 Strasbourg, France
- University of Strasbourg Institute for Advanced Study (USIAS), Strasbourg, France
| | - Alice Santoro
- Biometals and Biology Chemistry, Institut de Chimie (CNRS UMR7177), Université de Strasbourg, 4 rue B. Pascal, 67081 Strasbourg, France
- University of Strasbourg Institute for Advanced Study (USIAS), Strasbourg, France
| | - Bruno Alies
- Université de Bordeaux, ChemBioPharm INSERM U1212 CNRS UMR 5320, Bordeaux, France
| | - Peter Faller
- Biometals and Biology Chemistry, Institut de Chimie (CNRS UMR7177), Université de Strasbourg, 4 rue B. Pascal, 67081 Strasbourg, France
- University of Strasbourg Institute for Advanced Study (USIAS), Strasbourg, France
| | - Christelle Hureau
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, BP 44099 31077 Toulouse Cedex 4, France
- University of Toulouse, UPS, INPT, 31077 Toulouse Cedex 4, France
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53
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Pham DQH, Li MS, La Penna G. Copper Binding Induces Polymorphism in Amyloid-β Peptide: Results of Computational Models. J Phys Chem B 2018; 122:7243-7252. [PMID: 29957993 DOI: 10.1021/acs.jpcb.8b03983] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Amyloid-β (Aβ) peptides are intrinsically disordered peptides, and their aggregation is the hallmark of Alzheimer's disease development. The propensity of the Aβ peptide to intermolecular interactions, the latter favoring different types of oligomers and aggregated forms, has been the object of a huge number of studies. Several facts are now established: the presence of large amount of d-block (M) ions (Zn, Cu, and Fe) in the aggregated forms; the 1:1 M/Aβ ratio favors the formation of amorphous aggregates, with an aggregation rate lower than that in the absence of such ions. In particular, statistical models describing the interactions between copper and amyloid peptides are mandatory to explain the relationship between neurodegeneration, copper dyshomeostasis, and overproduction of reactive oxygen species, the latter event occurring with aging. In this work, we show, by replica-exchange molecular dynamics simulations, that a copper ion (Cu2+) bound as in the experimentally observed prevailing coordination enhances the probability of closed structures that hinder the formation of extended intermolecular hydrogen bonds that stabilize fibrillar ordered aggregated forms. On the other hand, this effect enhances the catalytic role of the complex during the lifetime of soluble forms.
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Affiliation(s)
- Dinh Quoc Huy Pham
- Institute of Physics , Polish Academy of Sciences , Al. Lotnikow 32/46 , 02-668 Warsaw , Poland.,Institute for Computational Science and Technology , 6 Quarter, Linh Trung Ward, Thu Duc District, Ho Chi Minh City 700000 , Vietnam
| | - Mai Suan Li
- Institute of Physics , Polish Academy of Sciences , Al. Lotnikow 32/46 , 02-668 Warsaw , Poland
| | - Giovanni La Penna
- National Research Council Italy (CNR), Institute for Chemistry of Organometallic Compounds (ICCOM) , 50019 Florence , Italy.,Italian Institute for Nuclear Physics (INFN), Section of Roma-Tor Vergata , Rome 00133 , Italy
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54
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Galante D, Cavallo E, Perico A, D'Arrigo C. Effect of ferric citrate on amyloid-beta peptides behavior. Biopolymers 2018; 109:e23224. [PMID: 29897618 DOI: 10.1002/bip.23224] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Revised: 04/06/2018] [Accepted: 04/19/2018] [Indexed: 12/26/2022]
Abstract
Amyloid beta (Aβ) aggregation and oxidative stress are two of the central events in Alzheimer's Disease (AD). Both these phenomena can be caused by the interaction of Aβ with metal ions. In the last years the interaction between ZnII , CuII , and Aβ was much studied, but between iron and Aβ it is still little known. In this work we determine how three Aβ peptides, present in AD, interact with FeIII -citrate. The three Aβ peptides are: full length Aβ1-42, an isoform truncated at Glutamic acid in position three, Aβ3-42, and its pyroglutamated form AβpE3-42. Conformation and morphology of the three peptides, aggregated with and without FeIII -citrate were studied. Besides, we have determined the strength of the interactions Aβ/FeIII -citrate studying the effect of ethylenediaminetetraacetic acid as chelator. Results reported here demonstrate that FeIII -citrate promotes the aggregation in all the three peptides. Moreover, Aspartic acid 1, Glutamic acid 3, and Tyrosine 10 have an important role in the coordination with iron, generating a more stable complex for Aβ1-42 compared to that for the truncated peptides.
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Affiliation(s)
- D Galante
- Institute for Macromolecular Studies, National Research Council, Genova, 16149, Italy
| | - E Cavallo
- Institute for Macromolecular Studies, National Research Council, Genova, 16149, Italy.,Department of Chemistry and Industrial Chemistry, University of Genova, Via Dodecaneso 31, Genova, 16146, Italy
| | - A Perico
- Institute for Macromolecular Studies, National Research Council, Genova, 16149, Italy
| | - C D'Arrigo
- Institute for Macromolecular Studies, National Research Council, Genova, 16149, Italy
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55
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Gao PF, Mao YT, Yang T, Zou HY, Li YF, Huang CZ. Glutathione-driven Cu(i)-O 2 chemistry: a new light-up fluorescent assay for intracellular glutathione. Analyst 2018; 143:2486-2490. [PMID: 29750225 DOI: 10.1039/c8an00704g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Besides its widely known role as an endogenous antioxidant in scavenging free radicals, glutathione (GSH) can also play the role of prooxidant and promote CuO-induced formation of hydroxyl radicals to light up a fluorescent signal through Cu(i)-O2 chemistry without requiring additional H2O2. This approach is independent of the mechanisms of enzyme mimics, such as the well-known oxidase and peroxidase mimetics, providing a new method to simply and effectively analyze intracellular GSH.
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Affiliation(s)
- Peng Fei Gao
- Key Laboratory of Luminescent and Real-Time Analytical Chemistry (Southwest University), Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, China.
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56
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57
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Cheignon C, Tomas M, Bonnefont-Rousselot D, Faller P, Hureau C, Collin F. Oxidative stress and the amyloid beta peptide in Alzheimer's disease. Redox Biol 2018; 14:450-464. [PMID: 29080524 PMCID: PMC5680523 DOI: 10.1016/j.redox.2017.10.014] [Citation(s) in RCA: 1273] [Impact Index Per Article: 212.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Revised: 10/14/2017] [Accepted: 10/17/2017] [Indexed: 01/12/2023] Open
Abstract
Oxidative stress is known to play an important role in the pathogenesis of a number of diseases. In particular, it is linked to the etiology of Alzheimer's disease (AD), an age-related neurodegenerative disease and the most common cause of dementia in the elderly. Histopathological hallmarks of AD are intracellular neurofibrillary tangles and extracellular formation of senile plaques composed of the amyloid-beta peptide (Aβ) in aggregated form along with metal-ions such as copper, iron or zinc. Redox active metal ions, as for example copper, can catalyze the production of Reactive Oxygen Species (ROS) when bound to the amyloid-β (Aβ). The ROS thus produced, in particular the hydroxyl radical which is the most reactive one, may contribute to oxidative damage on both the Aβ peptide itself and on surrounding molecule (proteins, lipids, …). This review highlights the existing link between oxidative stress and AD, and the consequences towards the Aβ peptide and surrounding molecules in terms of oxidative damage. In addition, the implication of metal ions in AD, their interaction with the Aβ peptide and redox properties leading to ROS production are discussed, along with both in vitro and in vivo oxidation of the Aβ peptide, at the molecular level.
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Affiliation(s)
- C Cheignon
- LCC (Laboratoire de Chimie de Coordination), CNRS UPR 8241, 205 route de Narbonne, 31062 Toulouse Cedex 09, France; Université de Toulouse; UPS, INPT, 31077 Toulouse, France
| | - M Tomas
- LCC (Laboratoire de Chimie de Coordination), CNRS UPR 8241, 205 route de Narbonne, 31062 Toulouse Cedex 09, France; Université de Toulouse; UPS, INPT, 31077 Toulouse, France
| | - D Bonnefont-Rousselot
- Department of Metabolic Biochemistry, La Pitié Salpêtrière-Charles Foix University Hospital (AP-HP), Paris, France; Department of Biochemistry, Faculty of Pharmacy, Paris Descartes University, Paris, France; CNRS UMR8258 - INSERM U1022, Faculty of Pharmacy, Paris Descartes University, Paris, France
| | - P Faller
- Biometals and Biology Chemistry, Institut de Chimie (CNRS UMR 7177), University of Strasbourg, 4 rue B. Pascal, 67081 Strasbourg Cedex, France
| | - C Hureau
- LCC (Laboratoire de Chimie de Coordination), CNRS UPR 8241, 205 route de Narbonne, 31062 Toulouse Cedex 09, France; Université de Toulouse; UPS, INPT, 31077 Toulouse, France
| | - F Collin
- LCC (Laboratoire de Chimie de Coordination), CNRS UPR 8241, 205 route de Narbonne, 31062 Toulouse Cedex 09, France; Université de Toulouse; UPS, INPT, 31077 Toulouse, France.
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58
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La Penna G, Li MS. Towards High-Throughput Modelling of Copper Reactivity Induced by Structural Disorder in Amyloid Peptides. Chemistry 2018; 24:5259-5270. [DOI: 10.1002/chem.201704654] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2017] [Indexed: 12/26/2022]
Affiliation(s)
- Giovanni La Penna
- National Research Council (CNR); Institute for Chemistry of Organometallic Compounds (ICCOM); via Madonna del Piano 10 50019 Sesto Fiorentino, Firenze Italy
| | - Mai Suan Li
- Polish Academy of Sciences; Institute of Physics; al. Lotników 32/46 02-668 Warsaw Poland
- Institute for Computational Science and Technology, SBI Building, Quang Trung Software City, Tan Chanh Hiep Ward, District 12; Ho Chi Minh City Vietnam
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59
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Zhang H, Zhang C, Dong XY, Zheng J, Sun Y. Design of nonapeptide LVFFARKHH: A bifunctional agent against Cu2+
-mediated amyloid β-protein aggregation and cytotoxicity. J Mol Recognit 2018; 31:e2697. [DOI: 10.1002/jmr.2697] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2017] [Revised: 10/14/2017] [Accepted: 11/28/2017] [Indexed: 11/07/2022]
Affiliation(s)
- Huan Zhang
- Department of Biochemical Engineering and Key Laboratory of Systems Bioengineering of the Ministry of Education, School of Chemical Engineering and Technology; Tianjin University; Tianjin 300072 China
| | - Chong Zhang
- Department of Biochemical Engineering and Key Laboratory of Systems Bioengineering of the Ministry of Education, School of Chemical Engineering and Technology; Tianjin University; Tianjin 300072 China
| | - Xiao-Yan Dong
- Department of Biochemical Engineering and Key Laboratory of Systems Bioengineering of the Ministry of Education, School of Chemical Engineering and Technology; Tianjin University; Tianjin 300072 China
| | - Jie Zheng
- Department of Chemical and Biomolecular Engineering; The University of Akron; Akron OH 44325 USA
| | - Yan Sun
- Department of Biochemical Engineering and Key Laboratory of Systems Bioengineering of the Ministry of Education, School of Chemical Engineering and Technology; Tianjin University; Tianjin 300072 China
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60
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Borghesani V, Alies B, Hureau C. Cu(II) binding to various forms of amyloid-β peptides. Are they friends or foes? Eur J Inorg Chem 2018; 2018:7-15. [PMID: 30186035 PMCID: PMC6120674 DOI: 10.1002/ejic.201700776] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2017] [Indexed: 01/25/2023]
Abstract
In the present micro-review, we describe the Cu(II) binding to several forms of amyloid-β peptides, the peptides involved in Alzheimer's disease. It has indeed been shown that in addition to the "full-length" peptide originating from the precursor protein after cleavage at position 1, several other shorter peptides do exist in large proportion and may be involved in the disease as well. Cu(II) binding to amyloid-β peptides is one of the key interactions that impact both the aggregating properties of the amyloid peptides and the Reactive Oxygen Species (ROS) production, two events linked to the etiology of the disease. Binding sites and affinity are described in correlation with Cu(II) induced ROS formation and Cu(II) altered aggregation, for amyloid peptides starting at position 1, 3, 4, 11 and for the corresponding pyroglutamate forms when they could be obtained (i.e. for peptides cleaved at positions 3 and 11). It appears that the current paradigm which points out a toxic role of the Cu(II) - amyloid-β interaction might well be shifted towards a possible protective role when the peptides considered are the N-terminally truncated ones.
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Affiliation(s)
- Valentina Borghesani
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, BP 44099 31077 Toulouse Cedex 4, France
- University of Toulouse, UPS, INPT, 31077 Toulouse Cedex 4, France
| | | | - Christelle Hureau
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, BP 44099 31077 Toulouse Cedex 4, France
- University of Toulouse, UPS, INPT, 31077 Toulouse Cedex 4, France
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61
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Habtemariam S. Iridoids and Other Monoterpenes in the Alzheimer's Brain: Recent Development and Future Prospects. Molecules 2018; 23:molecules23010117. [PMID: 29316661 PMCID: PMC6017424 DOI: 10.3390/molecules23010117] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2017] [Revised: 01/04/2018] [Accepted: 01/05/2018] [Indexed: 12/14/2022] Open
Abstract
Iridoids are a class of monoterpenoid compounds constructed from 10-carbon skeleton of isoprene building units. These compounds in their aglycones and glycosylated forms exist in nature to contribute to mechanisms related to plant defenses and diverse plant-animal interactions. Recent studies have also shown that iridoids and other structurally related monoterpenes display a vast array of pharmacological effects that make them potential modulators of the Alzheimer’s disease (AD). This review critically evaluates the therapeutic potential of these natural products by assessing key in vitro and in vivo data published in the scientific literature. Mechanistic approach of scrutiny addressing their effects in the Alzheimer’s brain including the τ-protein phosphorylation signaling, amyloid beta (Aβ) formation, aggregation, toxicity and clearance along with various effects from antioxidant to antiinflammatory mechanisms are discussed. The drug likeness of these compounds and future prospects to consider in their development as potential leads are addressed.
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Affiliation(s)
- Solomon Habtemariam
- Pharmacognosy Research Laboratories & Herbal Analysis Services, University of Greenwich, Central Avenue, Chatham-Maritime, Kent ME4 4TB, UK.
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62
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Chen W, Ouyang J, Yi X, Xu Y, Niu C, Zhang W, Wang L, Sheng J, Deng L, Liu YN, Guo S. Black Phosphorus Nanosheets as a Neuroprotective Nanomedicine for Neurodegenerative Disorder Therapy. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2018; 30:1703458. [PMID: 29194780 DOI: 10.1002/adma.201703458] [Citation(s) in RCA: 204] [Impact Index Per Article: 34.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2017] [Revised: 09/15/2017] [Indexed: 05/18/2023]
Abstract
Transition-metal dyshomeostasis is recognized as a critical pathogenic factor at the onset and progression of neurodegenerative disorder (ND). Excess transition-metal ions such as Cu2+ can catalyze the generation of cytotoxic reactive oxygen species and thereafter induce neuronal cell apoptosis. Exploring new chelating agents, which are not only capable of capturing excess redox-active metal, but can also cross the blood-brain barrier (BBB), are highly desired for ND therapy. Herein, it is demonstrated that 2D black phosphorus (BP) nanosheets can capture Cu2+ efficiently and selectively to protect neuronal cells from Cu2+ -induced neurotoxicity. Moreover, both in vitro and in vivo studies show that the BBB permeability of BP nanosheets is significantly improved under near-infrared laser irradiation due to their strong photothermal effect, which overcomes the drawback of conventional chelating agents. Furthermore, the excellent biocompatibility and stability guarantee the biosafety of BP in future clinical applications. Therefore, these features make BP nanosheets have the great potential to work as an efficient neuroprotective nanodrug for ND therapy.
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Affiliation(s)
- Wansong Chen
- College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, 410083, China
- State Key Laboratory for Powder Metallurgy, Central South University, Changsha, Hunan, 410083, China
| | - Jiang Ouyang
- College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, 410083, China
| | - Xinyao Yi
- College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, 410083, China
| | - Yan Xu
- Department of Ultrasound Diagnosis, the Second Xiangya Hospital, Central South University, Changsha, Hunan, 410011, China
| | - Chengcheng Niu
- Department of Ultrasound Diagnosis, the Second Xiangya Hospital, Central South University, Changsha, Hunan, 410011, China
| | - Weiyu Zhang
- Department of Materials Science and Engineering, and BIC-ESAT, College of Engineering, Peking University, Beijing, 100871, China
| | - Liqiang Wang
- College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, 410083, China
| | - Jianping Sheng
- College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, 410083, China
| | - Liu Deng
- College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, 410083, China
| | - You-Nian Liu
- College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, 410083, China
- State Key Laboratory for Powder Metallurgy, Central South University, Changsha, Hunan, 410083, China
| | - Shaojun Guo
- Department of Materials Science and Engineering, and BIC-ESAT, College of Engineering, Peking University, Beijing, 100871, China
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63
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Zhang C, Gomes LM, Zhang T, Storr T. A small bifunctional chelator that modulates Aβ42 aggregation. CAN J CHEM 2018. [DOI: 10.1139/cjc-2017-0623] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Multifunctional compounds that can modulate amyloid-β (Aβ) aggregation and interact with metal ions hold considerable promise as therapeutic agents for Alzheimer’s disease (AD). Using the copper-catalyzed azide-alkyne cycloaddition reaction, a novel bifunctional chelator 2-(1-(4-(dimethylamino)benzyl)-1H-1,2,3-triazol-4-yl)phenol (L1) was synthesized. L1 contains a bidentate metal-binding unit and a pendant dimethylamino moiety. The product was characterized by 1H NMR, 13C NMR, and MS. The metal-binding properties of L1 were probed by UV–vis spectroscopy to determine Cu:L stoichiometry. L1 was determined to limit Aβ aggregation at 48 h via a ThT assay. In addition, L1 complies with Lipinski’s rules and calculated logBB values for potential drug likeness and BBB permeability. These results suggest that L1 is a suitable candidate for further study as a multifunctional compound to treat AD.
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Affiliation(s)
- Chaofeng Zhang
- College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
| | - Luiza M.F. Gomes
- Department of Chemistry, Simon Fraser University, Burnaby, BC V5A 1S6, Canada
| | - Tonglu Zhang
- College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
| | - Tim Storr
- Department of Chemistry, Simon Fraser University, Burnaby, BC V5A 1S6, Canada
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64
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Božić B, Korać J, Stanković DM, Stanić M, Popović-Bijelić A, Bogdanović Pristov J, Spasojević I, Bajčetić M. Mechanisms of redox interactions of bilirubin with copper and the effects of penicillamine. Chem Biol Interact 2017; 278:129-134. [PMID: 29079291 DOI: 10.1016/j.cbi.2017.10.022] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Revised: 10/10/2017] [Accepted: 10/22/2017] [Indexed: 10/18/2022]
Abstract
Toxic effects of unconjugated bilirubin (BR) in neonatal hyperbilirubinemia have been related to redox and/or coordinate interactions with Cu2+. However, the development and mechanisms of such interactions at physiological pH have not been resolved. This study shows that BR reduces Cu2+ to Cu1+ in 1:1 stoichiometry. Apparently, BR undergoes degradation, i.e. BR and Cu2+ do not form stable complexes. The binding of Cu2+ to inorganic phosphates, liposomal phosphate groups, or to chelating drug penicillamine, impedes redox interactions with BR. Cu1+ undergoes spontaneous oxidation by O2 resulting in hydrogen peroxide accumulation and hydroxyl radical production. In relation to this, copper and BR induced synergistic oxidative/damaging effects on erythrocytes membrane, which were alleviated by penicillamine. The production of reactive oxygen species by BR and copper represents a plausible cause of BR toxic effects and cell damage in hyperbilirubinemia. Further examination of therapeutic potentials of copper chelators in the treatment of severe neonatal hyperbilirubinemia is needed.
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Affiliation(s)
- Bojana Božić
- Department of Pharmacology, Clinical Pharmacology and Toxicology, School of Medicine, University of Belgrade, P.O. Box 38, 11000 Belgrade, Serbia
| | - Jelena Korać
- Life Sciences Department, Institute for Multidisciplinary Research, University of Belgrade, Kneza Višeslava 1, 11000 Belgrade, Serbia
| | - Dalibor M Stanković
- The Vinča Institute of Nuclear Sciences, University of Belgrade, POB 522, 11001 Belgrade, Serbia; Department of Analytical Chemistry, Innovation Center of the Faculty of Chemistry, University of Belgrade, Studentski trg 12-16, Belgrade, 11000, Serbia
| | - Marina Stanić
- Life Sciences Department, Institute for Multidisciplinary Research, University of Belgrade, Kneza Višeslava 1, 11000 Belgrade, Serbia
| | - Ana Popović-Bijelić
- EPR Laboratory, Faculty of Physical Chemistry, University of Belgrade, Studentski trg 12-16, 11158 Belgrade, Serbia
| | - Jelena Bogdanović Pristov
- Life Sciences Department, Institute for Multidisciplinary Research, University of Belgrade, Kneza Višeslava 1, 11000 Belgrade, Serbia
| | - Ivan Spasojević
- Life Sciences Department, Institute for Multidisciplinary Research, University of Belgrade, Kneza Višeslava 1, 11000 Belgrade, Serbia.
| | - Milica Bajčetić
- Department of Pharmacology, Clinical Pharmacology and Toxicology, School of Medicine, University of Belgrade, P.O. Box 38, 11000 Belgrade, Serbia; Clinical Pharmacology Unit, University Children's Hospital, 11000 Belgrade, Serbia
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65
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Yako N, Young TR, Cottam Jones JM, Hutton CA, Wedd AG, Xiao Z. Copper binding and redox chemistry of the Aβ16 peptide and its variants: insights into determinants of copper-dependent reactivity. Metallomics 2017; 9:278-291. [PMID: 28145544 DOI: 10.1039/c6mt00299d] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The metal-binding sites of Aβ peptides are dictated primarily by the coordination preferences of the metal ion. Consequently, Cu(i) is typically bound with two His ligands in a linear mode while Cu(ii) forms a pseudo-square planar stereochemistry with the N-terminal amine nitrogen acting as an anchoring ligand. Several distinct combinations of other groups can act as co-ligands for Cu(ii). A population of multiple binding modes is possible with the equilibrium position shifting sensitively with solution pH and the nature of the residues in the N-terminal region. This work examined the Cu(ii) chemistry of the Aβ16 peptide and several variants that targeted these binding modes. The results are consistent with: (i) at pH < 7.8, the square planar site in CuII-Aβ16 consists primarily of a bidentate ligand provided by the carboxylate sidechain of Asp1 and the N-terminal amine supported by the imidazole sidechains of two His residues (designated here as component IA); it is in equilibrium with a less stable component IB in which the carboxylate ligand is substituted by the Asp1-Ala2 carbonyl oxygen. (ii) Both IA and IB convert to a common component II (apparent transition pKa ∼7.8 for IA and ∼6.5 for IB, respectively) featuring a tridentate ligand consisting of the N-terminal amine, the Asp1-Ala2 amide and the Ala2-Pro3 carbonyl; this stereochemistry is stabilized by two five-membered chelate rings. (iii) Component IA is stabilized for variant Aβ16-D1H, components I (both IA and IB) are imposed on Aβ16-A2P while the less stable IB is enforced on Aβ16-D1A (which is converted to component II at pH ∼6.5); (iv) components IA and IB share two His ligands with Cu(i) and are more reactive in redox catalysis than component II that features a highly covalent and less reactive amide N- ligand. The redox activity of IA is further enhanced for peptides with a His1 N-terminus that may act as a ligand for either Cu(i) or Cu(ii) with lower re-organization energy required for redox-shuttling. This study provided insights into the determinants that regulate the reactivity of Cu-Aβ complexes.
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Affiliation(s)
- Nineveh Yako
- School of Chemistry and The Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Victoria 3010, Australia.
| | - Tessa R Young
- School of Chemistry and The Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Victoria 3010, Australia.
| | - Jade M Cottam Jones
- School of Chemistry and The Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Victoria 3010, Australia.
| | - Craig A Hutton
- School of Chemistry and The Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Victoria 3010, Australia.
| | - Anthony G Wedd
- School of Chemistry and The Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Victoria 3010, Australia.
| | - Zhiguang Xiao
- School of Chemistry and The Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Victoria 3010, Australia.
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66
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Cheignon C, Faller P, Testemale D, Hureau C, Collin F. Metal-catalyzed oxidation of Aβ and the resulting reorganization of Cu binding sites promote ROS production. Metallomics 2017; 8:1081-1089. [PMID: 27730227 PMCID: PMC5714184 DOI: 10.1039/c6mt00150e] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In the context of Alzheimer’s disease (AD), the production of HO• by copper–amyloid beta (Aβ) in the presence of ascorbate is known to be deleterious for the Aβ peptide itself and also for the surrounding molecules, thus establishing a direct link between AD and oxidative stress. The metal-catalyzed oxidation (MCO) of Aβ primarily targets the residues involved in copper coordination during HO• production. In the present work, we demonstrate that the oxidative damage undergone by Aβ during MCO lead to a change in copper coordination, with enhanced catalytic properties that increases the rates of ascorbate consumption and HO• production, and the amount of HO• released by the system. This phenomenon is observed after the peptide has been sufficiently oxidized.
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Affiliation(s)
- Clémence Cheignon
- LCC (Laboratoire de Chimie de Coordination), CNRS UPR 8241, 205 route de Narbonne, 31062 Toulouse Cedex 09, France. and Université de Toulouse, UPS, INPT, 31077 Toulouse, France and UMR 152 Pharma Dev, Université de Toulouse, IRD, UPS, France
| | - Peter Faller
- LCC (Laboratoire de Chimie de Coordination), CNRS UPR 8241, 205 route de Narbonne, 31062 Toulouse Cedex 09, France. and Université de Toulouse, UPS, INPT, 31077 Toulouse, France
| | - Denis Testemale
- University of Grenoble Alpes, Institut NEEL, F-38000 Grenoble, France and CNRS, Institut NEEL, F-38000 Grenoble, France
| | - Christelle Hureau
- LCC (Laboratoire de Chimie de Coordination), CNRS UPR 8241, 205 route de Narbonne, 31062 Toulouse Cedex 09, France. and Université de Toulouse, UPS, INPT, 31077 Toulouse, France
| | - Fabrice Collin
- LCC (Laboratoire de Chimie de Coordination), CNRS UPR 8241, 205 route de Narbonne, 31062 Toulouse Cedex 09, France. and Université de Toulouse, UPS, INPT, 31077 Toulouse, France and UMR 152 Pharma Dev, Université de Toulouse, IRD, UPS, France
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67
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Atrián-Blasco E, Conte-Daban A, Hureau C. Mutual interference of Cu and Zn ions in Alzheimer's disease: perspectives at the molecular level. Dalton Trans 2017; 46:12750-12759. [PMID: 28937157 PMCID: PMC5656098 DOI: 10.1039/c7dt01344b] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Accepted: 06/22/2017] [Indexed: 12/26/2022]
Abstract
While metal ions such as copper and zinc are essential in biology, they are also linked to several amyloid-related diseases, including Alzheimer's disease (AD). Zinc and copper can indeed modify the aggregation pathways of the amyloid-β (Aβ) peptide, the key component encountered in AD. In addition, the redox active copper ions do produce Reactive Oxygen Species (ROS) when bound to the Aβ peptide. While Cu(i) or Cu(ii) or Zn(ii) coordination to the Aβ has been extensively studied in the last ten years, characterization of hetero-bimetallic Aβ complexes is still scarce. This is also true for the metal induced Aβ aggregation and ROS production, for which studies on the mutual influence of the copper and zinc ions are currently appearing. Last but not least, zinc can strongly interfere in therapeutic approaches relying on copper detoxification. This will be exemplified with a biological lead, namely metallothioneins, and with synthetic ligands.
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Affiliation(s)
- Elena Atrián-Blasco
- CNRS , LCC (Laboratoire de Chimie de Coordination) , 205 route de Narbonne , BP 44099 31077 Toulouse Cedex 4 , France .
- University of Toulouse , UPS , INPT , 31077 Toulouse Cedex 4 , France
| | - Amandine Conte-Daban
- CNRS , LCC (Laboratoire de Chimie de Coordination) , 205 route de Narbonne , BP 44099 31077 Toulouse Cedex 4 , France .
- University of Toulouse , UPS , INPT , 31077 Toulouse Cedex 4 , France
| | - Christelle Hureau
- CNRS , LCC (Laboratoire de Chimie de Coordination) , 205 route de Narbonne , BP 44099 31077 Toulouse Cedex 4 , France .
- University of Toulouse , UPS , INPT , 31077 Toulouse Cedex 4 , France
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68
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Jones MR, Mathieu E, Dyrager C, Faissner S, Vaillancourt Z, Korshavn KJ, Lim MH, Ramamoorthy A, Wee Yong V, Tsutsui S, Stys PK, Storr T. Multi-target-directed phenol-triazole ligands as therapeutic agents for Alzheimer's disease. Chem Sci 2017; 8:5636-5643. [PMID: 28989601 PMCID: PMC5621006 DOI: 10.1039/c7sc01269a] [Citation(s) in RCA: 69] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Accepted: 06/04/2017] [Indexed: 12/20/2022] Open
Abstract
Alzheimer's disease (AD) is a multifactorial disease that is characterized by the formation of intracellular neurofibrillary tangles and extracellular amyloid-β (Aβ) plaque deposits. Increased oxidative stress, metal ion dysregulation, and the formation of toxic Aβ peptide oligomers are all considered to contribute to the etiology of AD. In this work we have developed a series of ligands that are multi-target-directed in order to address several disease properties. 2-(1-(3-Hydroxypropyl)-1H-1,2,3-triazol-4-yl)phenol (POH), 2-(1-(2-morpholinoethyl)-1H-1,2,3-triazol-4-yl)phenol (PMorph), and 2-(1-(2-thiomorpholinoethyl)-1H-1,2,3-triazol-4-yl)phenol (PTMorph) have been synthesized and screened for their antioxidant capacity, Cu-binding affinity, interaction with the Aβ peptide and modulation of Aβ peptide aggregation, and the ability to limit Aβ1-42-induced neurotoxicity in human neuronal culture. The synthetic protocol and structural variance incorporated via click chemistry, highlights the influence of R-group modification on ligand-Aβ interactions and neuroprotective effects. Overall, this study demonstrates that the phenol-triazole ligand scaffold can target multiple factors associated with AD, thus warranting further therapeutic development.
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Affiliation(s)
- Michael R Jones
- Department of Chemistry , Simon Fraser University , V5A1S6 , Burnaby , BC , Canada .
- Department of Clinical Neurosciences , Hotchkiss Brain Institute , Cumming School of Medicine , University of Calgary , Calgary , Canada
| | - Emilie Mathieu
- Department of Chemistry , Simon Fraser University , V5A1S6 , Burnaby , BC , Canada .
| | - Christine Dyrager
- Department of Chemistry , Simon Fraser University , V5A1S6 , Burnaby , BC , Canada .
| | - Simon Faissner
- Department of Clinical Neurosciences , Hotchkiss Brain Institute , Cumming School of Medicine , University of Calgary , Calgary , Canada
- Department of Neurology , St. Josef-Hospital , Ruhr-University , Bochum , Germany
| | - Zavier Vaillancourt
- Department of Chemistry , Simon Fraser University , V5A1S6 , Burnaby , BC , Canada .
| | - Kyle J Korshavn
- Department of Chemistry , University of Michigan , Ann Arbor , USA
| | - Mi Hee Lim
- Department of Chemistry , Ulsan National Institute of Science and Technology (UNIST) , Ulsan , Korea
| | - Ayyalusamy Ramamoorthy
- Department of Chemistry , University of Michigan , Ann Arbor , USA
- Department of Biophysics , University of Michigan , Ann Arbor , USA
| | - V Wee Yong
- Department of Clinical Neurosciences , Hotchkiss Brain Institute , Cumming School of Medicine , University of Calgary , Calgary , Canada
| | - Shigeki Tsutsui
- Department of Clinical Neurosciences , Hotchkiss Brain Institute , Cumming School of Medicine , University of Calgary , Calgary , Canada
| | - Peter K Stys
- Department of Clinical Neurosciences , Hotchkiss Brain Institute , Cumming School of Medicine , University of Calgary , Calgary , Canada
| | - Tim Storr
- Department of Chemistry , Simon Fraser University , V5A1S6 , Burnaby , BC , Canada .
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69
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Cheignon C, Jones M, Atrián-Blasco E, Kieffer I, Faller P, Collin F, Hureau C. Identification of key structural features of the elusive Cu-Aβ complex that generates ROS in Alzheimer's disease. Chem Sci 2017; 8:5107-5118. [PMID: 28970897 PMCID: PMC5613283 DOI: 10.1039/c7sc00809k] [Citation(s) in RCA: 92] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2017] [Accepted: 04/29/2017] [Indexed: 12/16/2022] Open
Abstract
Oxidative stress is linked to the etiology of Alzheimer's disease (AD), the most common cause of dementia in the elderly. Redox active metal ions such as copper catalyze the production of Reactive Oxygen Species (ROS) when bound to the amyloid-β (Aβ) peptide encountered in AD. We propose that this reaction proceeds through a low-populated Cu-Aβ state, denoted the "catalytic in-between state" (CIBS), which is in equilibrium with the resting state (RS) of both Cu(i)-Aβ and Cu(ii)-Aβ. The nature of this CIBS is investigated in the present work. We report the use of complementary spectroscopic methods (X-ray absorption spectroscopy, EPR and NMR) to characterize the binding of Cu to a wide series of modified peptides in the RS. ROS production by the resulting Cu-peptide complexes was evaluated using fluorescence and UV-vis based methods and led to the identification of the amino acid residues involved in the Cu-Aβ CIBS species. In addition, a possible mechanism by which the ROS are produced is also proposed. These two main results are expected to affect the current vision of the ROS production mechanism by Cu-Aβ but also in other diseases involving amyloidogenic peptides with weakly structured copper binding sites.
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Affiliation(s)
- Clémence Cheignon
- LCC (Laboratoire de Chimie de Coordination) , CNRS UPR 8241 , 205 route de Narbonne , 31062 Toulouse Cedex 09 , France . ;
- Université de Toulouse , UPS , INPT , 31077 Toulouse , France
- UMR 152 Pharma Dev , Université de Toulouse , IRD , UPS , France
| | - Megan Jones
- LCC (Laboratoire de Chimie de Coordination) , CNRS UPR 8241 , 205 route de Narbonne , 31062 Toulouse Cedex 09 , France . ;
- Université de Toulouse , UPS , INPT , 31077 Toulouse , France
| | - Elena Atrián-Blasco
- LCC (Laboratoire de Chimie de Coordination) , CNRS UPR 8241 , 205 route de Narbonne , 31062 Toulouse Cedex 09 , France . ;
- Université de Toulouse , UPS , INPT , 31077 Toulouse , France
| | - Isabelle Kieffer
- Observatoire des Sciences de l'Univers de Grenoble (OSUG) , CNRS UMS 832 , 414 Rue de la Piscine , 38400 Saint Martin d'Hères , France
- BM30B/FAME , ESRF , The European Synchrotron , 71 Avenue des Martyrs , 38000 Grenoble , France
| | - Peter Faller
- LCC (Laboratoire de Chimie de Coordination) , CNRS UPR 8241 , 205 route de Narbonne , 31062 Toulouse Cedex 09 , France . ;
- Université de Toulouse , UPS , INPT , 31077 Toulouse , France
| | - Fabrice Collin
- LCC (Laboratoire de Chimie de Coordination) , CNRS UPR 8241 , 205 route de Narbonne , 31062 Toulouse Cedex 09 , France . ;
- Université de Toulouse , UPS , INPT , 31077 Toulouse , France
- UMR 152 Pharma Dev , Université de Toulouse , IRD , UPS , France
| | - Christelle Hureau
- LCC (Laboratoire de Chimie de Coordination) , CNRS UPR 8241 , 205 route de Narbonne , 31062 Toulouse Cedex 09 , France . ;
- Université de Toulouse , UPS , INPT , 31077 Toulouse , France
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70
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Drew SC. The Case for Abandoning Therapeutic Chelation of Copper Ions in Alzheimer's Disease. Front Neurosci 2017; 11:317. [PMID: 28626387 PMCID: PMC5455140 DOI: 10.3389/fnins.2017.00317] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2016] [Accepted: 05/18/2017] [Indexed: 12/26/2022] Open
Abstract
The "therapeutic chelation" approach to treating Alzheimer's disease (AD) evolved from the metals hypothesis, with the premise that small molecules can be designed to prevent transition metal-induced amyloid deposition and oxidative stress within the AD brain. Over more than 20 years, countless in vitro studies have been devoted to characterizing metal binding, its effect on Aβ aggregation, ROS production, and in vitro toxicity. Despite a lack of evidence for any clinical benefit, the conjecture that therapeutic chelation is an effective approach for treating AD remains widespread. Here, the author plays the devil's advocate, questioning the experimental evidence, the dogma, and the value of therapeutic chelation, with a major focus on copper ions.
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Affiliation(s)
- Simon C. Drew
- Department of Medicine, Royal Melbourne Hospital, University of MelbourneMelbourne, VIC, Australia
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71
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Pirota V, Dell'Acqua S, Monzani E, Nicolis S, Casella L. Copper-Aβ Peptides and Oxidation of Catecholic Substrates: Reactivity and Endogenous Peptide Damage. Chemistry 2016; 22:16964-16973. [PMID: 27735097 DOI: 10.1002/chem.201603824] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Indexed: 11/08/2022]
Abstract
The oxidative reactivity of copper complexes with Aβ peptides 1-16 and 1-28 (Aβ16 and Aβ28) against dopamine and related catechols under physiological conditions has been investigated in parallel with the competitive oxidative modification undergone by the peptides. It was found that both Aβ16 and Aβ28 markedly increase the oxidative reactivity of copper(II) towards the catechol compounds, up to a molar ratio of about 4:1 of peptide/copper(II). Copper redox cycling during the catalytic activity induces the competitive modification of the peptide at selected amino acid residues. The main modifications consist of oxidation of His13/14 to 2-oxohistidine and Phe19/20 to ortho-tyrosine, and the formation of a covalent His6-catechol adduct. Competition by the endogenous peptide is rather efficient, as approximately one peptide molecule is oxidized every 10 molecules of 4-methylcatechol.
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Affiliation(s)
- Valentina Pirota
- Dipartimento di Chimica, Università di Pavia, Via Taramelli 12, 27100, Pavia, Italy
| | - Simone Dell'Acqua
- Dipartimento di Chimica, Università di Pavia, Via Taramelli 12, 27100, Pavia, Italy
| | - Enrico Monzani
- Dipartimento di Chimica, Università di Pavia, Via Taramelli 12, 27100, Pavia, Italy
| | - Stefania Nicolis
- Dipartimento di Chimica, Università di Pavia, Via Taramelli 12, 27100, Pavia, Italy
| | - Luigi Casella
- Dipartimento di Chimica, Università di Pavia, Via Taramelli 12, 27100, Pavia, Italy
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72
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Rajasekhar K, Madhu C, Govindaraju T. Natural Tripeptide-Based Inhibitor of Multifaceted Amyloid β Toxicity. ACS Chem Neurosci 2016; 7:1300-10. [PMID: 27355515 DOI: 10.1021/acschemneuro.6b00175] [Citation(s) in RCA: 99] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Accumulation of amyloid beta (Aβ) peptide and its aggregates in the human brain is considered as one of the hallmarks of Alzheimer's disease (AD). The polymorphic oligomers and fully grown fibrillar aggregates of Aβ exhibit different levels of neuronal toxicity. Moreover, aggregation of Aβ in the presence of redox-active metal ions like Cu(2+) is responsible for the additional trait of cellular toxicity induced by the generation of reactive oxygen species (ROS). Herein, a multifunctional peptidomimetic inhibitor (P6) has been presented, based on a naturally occurring metal chelating tripeptide (GHK) and the inhibitor of Aβ aggregation. It was shown by employing various biophysical studies that P6 interact with Aβ and prevent the formation of toxic Aβ forms like oligomeric species and fibrillar aggregates. Further, P6 successfully sequestered Cu(2+) from the Aβ-Cu(2+) complex and maintained it in a redox-dormant state to prevent the generation of ROS. P6 inhibited membrane disruption by Aβ oligomers and efficiently prevented DNA damage caused by the Aβ-Cu(2+) complex. PC12 cells were rescued from multifaceted Aβ toxicity when treated with P6, and the amount of ROS generated in cells was reduced. These attributes make P6 a potential therapeutic candidate to ameliorate the multifaceted Aβ toxicity in AD.
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Affiliation(s)
- K. Rajasekhar
- Bioorganic Chemistry Laboratory,
New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur
P. O., Bengaluru 560064, Karnataka, India
| | - Chilakapati Madhu
- Bioorganic Chemistry Laboratory,
New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur
P. O., Bengaluru 560064, Karnataka, India
| | - T. Govindaraju
- Bioorganic Chemistry Laboratory,
New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur
P. O., Bengaluru 560064, Karnataka, India
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73
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Walke GR, Ranade DS, Bapat AM, Srikanth R, Kulkarni PP. Mn(III)-Salen Protect Against Different ROS Species Generated by the Aβ16-Cu Complex. ChemistrySelect 2016. [DOI: 10.1002/slct.201600808] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Gulshan R. Walke
- Bioprospecting Group; Agharkar Research Institute; G. G. Agarkar road Pune India
| | - Dnyanesh S. Ranade
- Bioprospecting Group; Agharkar Research Institute; G. G. Agarkar road Pune India
| | - Archika M. Bapat
- Bioprospecting Group; Agharkar Research Institute; G. G. Agarkar road Pune India
| | - Rapole Srikanth
- Proteomics Laboratory; National Centre for Cell Science; University of Pune Campus Pune India
| | - Prasad P. Kulkarni
- Bioprospecting Group; Agharkar Research Institute; G. G. Agarkar road Pune India
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74
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Wezynfeld NE, Stefaniak E, Stachucy K, Drozd A, Płonka D, Drew SC, Krężel A, Bal W. Resistance of Cu(Aβ4-16) to Copper Capture by Metallothionein-3 Supports a Function for the Aβ4-42 Peptide as a Synaptic Cu(II) Scavenger. Angew Chem Int Ed Engl 2016; 55:8235-8. [PMID: 27238224 DOI: 10.1002/anie.201511968] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2015] [Revised: 03/23/2015] [Indexed: 01/16/2023]
Abstract
Aβ4-42 is a major species of Aβ peptide in the brains of both healthy individuals and those affected by Alzheimer's disease. It has recently been demonstrated to bind Cu(II) with an affinity approximately 3000 times higher than the commonly studied Aβ1-42 and Aβ1-40 peptides, which are implicated in the pathogenesis of Alzheimer's disease. Metallothionein-3, a protein considered to orchestrate copper and zinc metabolism in the brain and provide antioxidant protection, was shown to extract Cu(II) from Aβ1-40 when acting in its native Zn7 MT-3 form. This reaction is assumed to underlie the neuroprotective effect of Zn7 MT-3 against Aβ toxicity. In this work, we used the truncated model peptides Aβ1-16 and Aβ4-16 to demonstrate that the high-affinity Cu(II) complex of Aβ4-16 is resistant to Zn7 MT-3 reactivity. This indicates that the analogous complex of the full-length peptide Cu(Aβ4-42) will not yield copper to MT-3 in the brain, thus supporting the concept of a physiological role for Aβ4-42 as a Cu(II) scavenger in the synaptic cleft.
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Affiliation(s)
- Nina E Wezynfeld
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5a, 02-106, Warsaw, Poland
| | - Ewelina Stefaniak
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5a, 02-106, Warsaw, Poland
| | - Kinga Stachucy
- Laboratory of Chemical Biology, University of Wrocław, Poland
| | - Agnieszka Drozd
- Laboratory of Chemical Biology, University of Wrocław, Poland
| | - Dawid Płonka
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5a, 02-106, Warsaw, Poland
| | - Simon C Drew
- Florey Department of Neuroscience and Mental Health, The University of Melbourne, Australia
| | - Artur Krężel
- Laboratory of Chemical Biology, University of Wrocław, Poland
| | - Wojciech Bal
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5a, 02-106, Warsaw, Poland.
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75
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Wezynfeld NE, Stefaniak E, Stachucy K, Drozd A, Płonka D, Drew SC, Krężel A, Bal W. Resistance of Cu(Aβ4
–
16) to Copper Capture by Metallothionein‐3 Supports a Function for the Aβ4
–
42 Peptide as a Synaptic Cu
II
Scavenger. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201511968] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Nina E. Wezynfeld
- Institute of Biochemistry and Biophysics Polish Academy of Sciences Pawińskiego 5a 02-106 Warsaw Poland
| | - Ewelina Stefaniak
- Institute of Biochemistry and Biophysics Polish Academy of Sciences Pawińskiego 5a 02-106 Warsaw Poland
| | - Kinga Stachucy
- Laboratory of Chemical Biology University of Wrocław Poland
| | | | - Dawid Płonka
- Institute of Biochemistry and Biophysics Polish Academy of Sciences Pawińskiego 5a 02-106 Warsaw Poland
| | - Simon C. Drew
- Florey Department of Neuroscience and Mental Health The University of Melbourne Australia
| | - Artur Krężel
- Laboratory of Chemical Biology University of Wrocław Poland
| | - Wojciech Bal
- Institute of Biochemistry and Biophysics Polish Academy of Sciences Pawińskiego 5a 02-106 Warsaw Poland
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76
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Stability of transient Cu+Aβ (1–16) species and influence of coordination and peptide configuration on superoxide formation. Theor Chem Acc 2016. [DOI: 10.1007/s00214-016-1836-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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77
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Metals and Neuronal Metal Binding Proteins Implicated in Alzheimer's Disease. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2016; 2016:9812178. [PMID: 26881049 PMCID: PMC4736980 DOI: 10.1155/2016/9812178] [Citation(s) in RCA: 92] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/05/2015] [Accepted: 12/17/2015] [Indexed: 11/18/2022]
Abstract
Alzheimer's disease (AD) is the most prevalent age-related dementia affecting millions of people worldwide. Its main pathological hallmark feature is the formation of insoluble protein deposits of amyloid-β and hyperphosphorylated tau protein into extracellular plaques and intracellular neurofibrillary tangles, respectively. Many of the mechanistic details of this process remain unknown, but a well-established consequence of protein aggregation is synapse dysfunction and neuronal loss in the AD brain. Different pathways including mitochondrial dysfunction, oxidative stress, inflammation, and metal metabolism have been suggested to be implicated in this process. In particular, a body of evidence suggests that neuronal metal ions such as copper, zinc, and iron play important roles in brain function in health and disease states and altered homeostasis and distribution as a common feature across different neurodegenerative diseases and aging. In this focused review, we overview neuronal proteins that are involved in AD and whose metal binding properties may underlie important biochemical and regulatory processes occurring in the brain during the AD pathophysiological process.
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78
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Liu B, Hu X, Chai J, Zhu J, Yang B, Li Y. Application of nanodiamonds in Cu(ii)-based rhodamine B probes for NO detection and cell imaging. J Mater Chem B 2016; 4:3358-3364. [DOI: 10.1039/c6tb00524a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A nanodiamond-conjugated rhodamine fluorescent sensor for Cu(ii) which could then be developed as an excellent NO selective fluorescent particle.
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Affiliation(s)
- Bin Liu
- Key Laboratory of Chemical Biology
- Molecular Engineering of Ministry of Education
- Institute of Molecular Science
- Shanxi University
- Taiyuan 030006
| | - Xiangquan Hu
- Key Laboratory of Chemical Biology
- Molecular Engineering of Ministry of Education
- Institute of Molecular Science
- Shanxi University
- Taiyuan 030006
| | - Jie Chai
- Key Laboratory of Chemical Biology
- Molecular Engineering of Ministry of Education
- Institute of Molecular Science
- Shanxi University
- Taiyuan 030006
| | - Junyao Zhu
- Department of Chemistry
- College of Chemistry and Chemical Engineering
- Shanxi University
- Taiyuan
- P. R. China
| | - Binsheng Yang
- Key Laboratory of Chemical Biology
- Molecular Engineering of Ministry of Education
- Institute of Molecular Science
- Shanxi University
- Taiyuan 030006
| | - Yingqi Li
- Key Laboratory of Chemical Biology
- Molecular Engineering of Ministry of Education
- Institute of Molecular Science
- Shanxi University
- Taiyuan 030006
| |
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