51
|
Abstract
Aggregation of the amyloid-β (Aβ) peptide is strongly correlated with Alzheimer's disease (AD). Recent research has improved our understanding of the kinetics of amyloid fibril assembly and revealed new details regarding different stages in plaque formation. Presently, interest is turning toward studying this process in a holistic context, focusing on cellular components which interact with the Aβ peptide at various junctures during aggregation, from monomer to cross-β amyloid fibrils. However, even in isolation, a multitude of factors including protein purity, pH, salt content, and agitation affect Aβ fibril formation and deposition, often producing complicated and conflicting results. The failure of numerous inhibitors in clinical trials for AD suggests that a detailed examination of the complex interactions that occur during plaque formation, including binding of carbohydrates, lipids, nucleic acids, and metal ions, is important for understanding the diversity of manifestations of the disease. Unraveling how a variety of key macromolecular modulators interact with the Aβ peptide and change its aggregation properties may provide opportunities for developing therapies. Since no protein acts in isolation, the interplay of these diverse molecules may differentiate disease onset, progression, and severity, and thus are worth careful consideration.
Collapse
Affiliation(s)
- Katie L Stewart
- Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, University of Leeds, Leeds, LS2 9JT, UK.
| | - Sheena E Radford
- Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, University of Leeds, Leeds, LS2 9JT, UK.
| |
Collapse
|
52
|
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.
Collapse
Affiliation(s)
- Simon C. Drew
- Department of Medicine, Royal Melbourne Hospital, University of MelbourneMelbourne, VIC, Australia
| |
Collapse
|
53
|
Vahdati L, Kaffy J, Brinet D, Bernadat G, Correia I, Panzeri S, Fanelli R, Lequin O, Taverna M, Ongeri S, Piarulli U. Synthesis and Characterization of Hairpin Mimics that Modulate the Early Oligomerization and Fibrillization of Amyloid β-Peptide. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700010] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Leila Vahdati
- Università degli Studi dell'Insubria; Dipartimento di Scienza e Alta Tecnologia; Via Valleggio 11 22100 Como Italy
- BioCIS; Univ. Paris-Sud; CNRS; Université Paris-Saclay; 92290 Châtenay-Malabry France
| | - Julia Kaffy
- BioCIS; Univ. Paris-Sud; CNRS; Université Paris-Saclay; 92290 Châtenay-Malabry France
| | - Dimitri Brinet
- BioCIS; Univ. Paris-Sud; CNRS; Université Paris-Saclay; 92290 Châtenay-Malabry France
- Protéins and Nanotechnology in analytical science; Institut Galien de Paris Sud; Univ. Paris-Sud; CNRS; Université Paris-Saclay; 92290 Châtenay-Malabry France
| | - Guillaume Bernadat
- BioCIS; Univ. Paris-Sud; CNRS; Université Paris-Saclay; 92290 Châtenay-Malabry France
| | - Isabelle Correia
- Sorbonne Universités; UPMC Univ Paris 06; Ecole Normale Supérieure; PSL Research University; CNRS; Laboratoire des Biomolécules; 4 place Jussieu 75252 Paris Cedex 05 France
| | - Silvia Panzeri
- Università degli Studi dell'Insubria; Dipartimento di Scienza e Alta Tecnologia; Via Valleggio 11 22100 Como Italy
| | - Roberto Fanelli
- Università degli Studi dell'Insubria; Dipartimento di Scienza e Alta Tecnologia; Via Valleggio 11 22100 Como Italy
| | - Olivier Lequin
- Sorbonne Universités; UPMC Univ Paris 06; Ecole Normale Supérieure; PSL Research University; CNRS; Laboratoire des Biomolécules; 4 place Jussieu 75252 Paris Cedex 05 France
| | - Myriam Taverna
- Protéins and Nanotechnology in analytical science; Institut Galien de Paris Sud; Univ. Paris-Sud; CNRS; Université Paris-Saclay; 92290 Châtenay-Malabry France
| | - Sandrine Ongeri
- BioCIS; Univ. Paris-Sud; CNRS; Université Paris-Saclay; 92290 Châtenay-Malabry France
| | - Umberto Piarulli
- Università degli Studi dell'Insubria; Dipartimento di Scienza e Alta Tecnologia; Via Valleggio 11 22100 Como Italy
| |
Collapse
|
54
|
Chauhan P, Muralidharan SB, Velappan AB, Datta D, Pratihar S, Debnath J, Ghosh KS. Inhibition of copper-mediated aggregation of human γD-crystallin by Schiff bases. J Biol Inorg Chem 2017; 22:505-517. [DOI: 10.1007/s00775-016-1433-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2016] [Accepted: 12/13/2016] [Indexed: 01/10/2023]
|
55
|
Jadhao M, Das C, Rawat A, Kumar H, Joshi R, Maiti S, Ghosh SK. Development of multifunctional heterocyclic Schiff base as a potential metal chelator: a comprehensive spectroscopic approach towards drug discovery. J Biol Inorg Chem 2016; 22:47-59. [PMID: 27822620 DOI: 10.1007/s00775-016-1407-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2016] [Accepted: 10/24/2016] [Indexed: 10/20/2022]
Abstract
Amyloid-β peptides and their metal-associated aggregated states have been implicated in the pathogenesis of Alzheimer's disease. The present paper epitomises the design and synthesis of a small, neutral, lipophilic benzothiazole Schiff base (E)-2-((6-chlorobenzo[d]thiazol-2-ylimino)methyl)-5-diethylamino)phenol (CBMDP), and explores its multifunctionalty as a potential metal chelator/fluorophore using UV-visible absorption, steady-state fluorescence, single molecule fluorescence correlation spectroscopic (FCS) techniques which is further corroborated by in silico studies. Some pharmaceutically relevant properties of the synthesized compound have also been calculated theoretically. Steady-state fluorescence and single molecule FCS reveal that the synthesized CBMDP not only recognizes oligomeric Aβ40, but could also be used as an amyloid-specific extrinsic fluorophore as it shows tremendous increase in its emission intensity in the presence of Aβ40. Molecular docking exercise and MD simulation reveal that CBMDP localizes itself in the crucial amyloidogenic and copper-binding region of Aβ40 and undergoes a strong binding interaction via H-bonding and π-π stacking. It stabilizes the solitary α-helical Aβ40 monomer by retaining the initial conformation of the Aβ central helix and mostly interacts with the hydrophilic N-terminus and the α-helical region spanning from Ala-2 to Val-24. CBMDP exhibits strong copper as well as zinc chelation ability and retards the rapid copper-induced aggregation of amyloid peptide. In addition, CBMDP shows radical scavenging activity which enriches its functionality. Overall, the consolidated in vitro and in silico results obtained for the synthesized molecule could provide a rational template for developing new multifunctional agents.
Collapse
Affiliation(s)
- Manojkumar Jadhao
- Department of Chemistry, Visvesvaraya National Institute of Technology, Nagpur, 440010, Maharashtra, India
| | - Chayan Das
- Department of Chemistry, Visvesvaraya National Institute of Technology, Nagpur, 440010, Maharashtra, India
| | - Anoop Rawat
- Tata Institute of Fundamental Research (TIFR), 1-Homi Bhabha Road, Colaba, 400005, Mumbai, India
| | - Himank Kumar
- Department of Chemistry, Visvesvaraya National Institute of Technology, Nagpur, 440010, Maharashtra, India
| | - Ritika Joshi
- Department of Chemistry, Visvesvaraya National Institute of Technology, Nagpur, 440010, Maharashtra, India
| | - Sudipta Maiti
- Tata Institute of Fundamental Research (TIFR), 1-Homi Bhabha Road, Colaba, 400005, Mumbai, India
| | - Sujit Kumar Ghosh
- Department of Chemistry, Visvesvaraya National Institute of Technology, Nagpur, 440010, Maharashtra, India.
| |
Collapse
|
56
|
Pellegrino S, Tonali N, Erba E, Kaffy J, Taverna M, Contini A, Taylor M, Allsop D, Gelmi ML, Ongeri S. β-Hairpin mimics containing a piperidine-pyrrolidine scaffold modulate the β-amyloid aggregation process preserving the monomer species. Chem Sci 2016; 8:1295-1302. [PMID: 28451272 PMCID: PMC5359901 DOI: 10.1039/c6sc03176e] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Accepted: 10/05/2016] [Indexed: 12/22/2022] Open
Abstract
Alzheimer's disease is a neurodegenerative disorder linked to oligomerization and fibrillization of amyloid β peptides, with Aβ1-42 being the most aggregative and neurotoxic one. We report herein the synthesis and conformational analysis of Aβ1-42-amyloid related β-hairpin peptidomimetics, built on a piperidine-pyrrolidine semi rigid β-turn inducer and bearing two small recognition peptide sequences, designed on oligomeric and fibril structures of Aβ1-42. According to these peptide sequences, a stable β-hairpin or a dynamic equilibrium between two possible architectures was observed. These original constructs are able to greatly delay the kinetics of Aβ1-42 aggregation process as demonstrated by thioflavin-T fluorescence, and transmission electron microscopy. Capillary electrophoresis indicates their ability to preserve the monomer species, inhibiting the formation of toxic oligomers. Furthermore, compounds protect against toxic effects of Aβ on neuroblastoma cells even at substoichiometric concentrations. This study is the first example of acyclic small β-hairpin mimics possessing such a highly efficient anti-aggregation activity. The protective effect is more pronounced than that observed with molecules which have undergone clinical trials. The structural elements made in this study provide valuable insights in the understanding of the aggregation process and insights to explore the design of novel acyclic β-hairpin targeting other types of amyloid-forming proteins.
Collapse
Affiliation(s)
- S Pellegrino
- DISFARM-Sez. Chimica Generale e Organica "A. Marchesini" , Universitá degli Studi di Milano , via Venezian 21 , 20133 Milano , Italy .
| | - N Tonali
- Molécules Fluorées et Chimie Médicinale , BioCIS , Univ. Paris-Sud , CNRS , Université Paris Saclay , 5 rue Jean-Baptiste Clément , 92296 Châtenay-Malabry Cedex , France .
| | - E Erba
- DISFARM-Sez. Chimica Generale e Organica "A. Marchesini" , Universitá degli Studi di Milano , via Venezian 21 , 20133 Milano , Italy .
| | - J Kaffy
- Molécules Fluorées et Chimie Médicinale , BioCIS , Univ. Paris-Sud , CNRS , Université Paris Saclay , 5 rue Jean-Baptiste Clément , 92296 Châtenay-Malabry Cedex , France .
| | - M Taverna
- Protéines et Nanotechnologies en Sciences Séparatives , Institut Galien Paris-Sud , Univ. Paris-Sud , CNRS , Université Paris Saclay , 5 rue Jean-Baptiste Clément , 92296 Châtenay-Malabry Cedex , France
| | - A Contini
- DISFARM-Sez. Chimica Generale e Organica "A. Marchesini" , Universitá degli Studi di Milano , via Venezian 21 , 20133 Milano , Italy .
| | - M Taylor
- Lancaster University , Division of Biomedical and Life Sciences , Faculty of Health and Medicine , Lancaster LA1 4YQ , UK
| | - D Allsop
- Lancaster University , Division of Biomedical and Life Sciences , Faculty of Health and Medicine , Lancaster LA1 4YQ , UK
| | - M L Gelmi
- DISFARM-Sez. Chimica Generale e Organica "A. Marchesini" , Universitá degli Studi di Milano , via Venezian 21 , 20133 Milano , Italy .
| | - S Ongeri
- Molécules Fluorées et Chimie Médicinale , BioCIS , Univ. Paris-Sud , CNRS , Université Paris Saclay , 5 rue Jean-Baptiste Clément , 92296 Châtenay-Malabry Cedex , France .
| |
Collapse
|
57
|
Hu X, Zhang Q, Wang W, Yuan Z, Zhu X, Chen B, Chen X. Tripeptide GGH as the Inhibitor of Copper-Amyloid-β-Mediated Redox Reaction and Toxicity. ACS Chem Neurosci 2016; 7:1255-63. [PMID: 27433833 DOI: 10.1021/acschemneuro.6b00145] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
The Aβ complexes of some redox-active species, such as Cu, cause oxidative stress and induce severe toxicity by generating reactive oxygen species (ROS). Thus, Cu chelation therapy should be considered as a valuable strategy for the treatment of Alzheimer's disease (AD). However, more attention should be paid to the specific chelating ability of these chelating agents. Herein, a tripeptide GGH was used to selectively chelate the Cu(2+) in Aβ-Cu complex in the presence of other metal ions (e.g., K(+), Ca(2+), Ni(2+), Mg(2+), and Zn(2+)) as shown by isothermal titration calorimetry results. GGH decreased the level of HO(•) radicals by preventing the formation of intermediate Cu(I) ion. Thus, the Cu species completely lost its catalytic activity at a superequimolar GGH/Cu(II) ratio (4:1) as observed by UV-visible spectroscopy, coumarin-3-carboxylic acid fluorescence, and BCA assay. Moreover, (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) (MTT) assay indicates that GGH increased PC-12 cell viability from 36% to 63%, and neurotoxicity partly triggered by ROS decreased. These results indicate potential development of peptide chelation therapy for AD treatment.
Collapse
Affiliation(s)
- Xiaoyu Hu
- Key Laboratory of Functional Polymer Materials of Ministry
of Education, Institute of Polymer Chemistry, Nankai University, Tianjin 300071, China
| | - Qian Zhang
- Key Laboratory of Functional Polymer Materials of Ministry
of Education, Institute of Polymer Chemistry, Nankai University, Tianjin 300071, China
| | - Wei Wang
- Key Laboratory of Functional Polymer Materials of Ministry
of Education, Institute of Polymer Chemistry, Nankai University, Tianjin 300071, China
| | - Zhi Yuan
- Key Laboratory of Functional Polymer Materials of Ministry
of Education, Institute of Polymer Chemistry, Nankai University, Tianjin 300071, China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300071, China
| | - Xushan Zhu
- Key Laboratory of Functional Polymer Materials of Ministry
of Education, Institute of Polymer Chemistry, Nankai University, Tianjin 300071, China
| | - Bing Chen
- Key Laboratory of Functional Polymer Materials of Ministry
of Education, Institute of Polymer Chemistry, Nankai University, Tianjin 300071, China
| | - Xingyu Chen
- Key Laboratory of Functional Polymer Materials of Ministry
of Education, Institute of Polymer Chemistry, Nankai University, Tianjin 300071, China
| |
Collapse
|
58
|
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.
Collapse
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
| |
Collapse
|
59
|
Dulla CG, Coulter DA, Ziburkus J. From Molecular Circuit Dysfunction to Disease: Case Studies in Epilepsy, Traumatic Brain Injury, and Alzheimer's Disease. Neuroscientist 2016; 22:295-312. [PMID: 25948650 PMCID: PMC4641826 DOI: 10.1177/1073858415585108] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Complex circuitry with feed-forward and feed-back systems regulate neuronal activity throughout the brain. Cell biological, electrical, and neurotransmitter systems enable neural networks to process and drive the entire spectrum of cognitive, behavioral, and motor functions. Simultaneous orchestration of distinct cells and interconnected neural circuits relies on hundreds, if not thousands, of unique molecular interactions. Even single molecule dysfunctions can be disrupting to neural circuit activity, leading to neurological pathology. Here, we sample our current understanding of how molecular aberrations lead to disruptions in networks using three neurological pathologies as exemplars: epilepsy, traumatic brain injury (TBI), and Alzheimer's disease (AD). Epilepsy provides a window into how total destabilization of network balance can occur. TBI is an abrupt physical disruption that manifests in both acute and chronic neurological deficits. Last, in AD progressive cell loss leads to devastating cognitive consequences. Interestingly, all three of these neurological diseases are interrelated. The goal of this review, therefore, is to identify molecular changes that may lead to network dysfunction, elaborate on how altered network activity and circuit structure can contribute to neurological disease, and suggest common threads that may lie at the heart of molecular circuit dysfunction.
Collapse
Affiliation(s)
- Chris G Dulla
- Department of Neuroscience, Tufts University School of Medicine, Boston, MA, USA
| | - Douglas A Coulter
- Department of Pediatrics and Neuroscience, University of Pennsylvania Perleman School of Medicine, Philadelphia, PA, USA Division of Neurology and the Research Institute of Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Jokubas Ziburkus
- Department of Biology and Biochemistry, University of Houston, Houston, TX, USA
| |
Collapse
|
60
|
Mehrazma B, Petoyan A, Opare SK, Rauk A. Interaction of the N-AcAβ(13–23)NH2 segment of the beta amyloid peptide with beta-sheet-blocking peptides: site and edge specificity. CAN J CHEM 2016. [DOI: 10.1139/cjc-2016-0033] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The region encompassing residues 13–23 of the amyloid beta peptide (Aβ(13–23)) of Alzheimer’s disease is the self-recognition site that initiates toxic oligomerization and fibrillization and also is the site of interaction of Aβ with many other proteins. We describe herein a study by molecular dynamics of the complexes formed by R (= N-AcAβ(13–23)NH2(N-CH3C(O)HHQKLVFFAEDNH2)) with several pseudopeptides designed to form β-sheets with Aβ(1-40,42) and prevent oligomer and fibril formation. Adhesion to both edges of the R β-strand is examined by structure analysis. Umbrella sampling along a dissociation pathway reveals approximate free energies of binding in the submicromolar range. One of the three pseudopeptides binds strongly to one edge of the R β-strand and another to the opposite edge, while the third displays strong binding to both edges. It is desirable to block both edges of the self-recognition site of Aβ to prevent oligomer formation. The study reveals that this may be accomplished by a single pseudopeptide or two in combination. Thus the pseudopeptides, used singly or in pairs, may be competitive inhibitors of Aβ oligomerization at stoichiometric concentrations.
Collapse
Affiliation(s)
- Banafsheh Mehrazma
- Department of Chemistry, University of Calgary, Calgary, AB T2N 1N4, Canada
- Department of Chemistry, University of Calgary, Calgary, AB T2N 1N4, Canada
| | - Anahit Petoyan
- Department of Chemistry, University of Calgary, Calgary, AB T2N 1N4, Canada
- Department of Chemistry, University of Calgary, Calgary, AB T2N 1N4, Canada
| | - Stanley K.A. Opare
- Department of Chemistry, University of Calgary, Calgary, AB T2N 1N4, Canada
- Department of Chemistry, University of Calgary, Calgary, AB T2N 1N4, Canada
| | - Arvi Rauk
- Department of Chemistry, University of Calgary, Calgary, AB T2N 1N4, Canada
- Department of Chemistry, University of Calgary, Calgary, AB T2N 1N4, Canada
| |
Collapse
|
61
|
Opare SK, Petoyan A, Mehrazma B, Rauk A. Molecular dynamics study of the monomers and dimers of N-AcAβ(13–23)NH2: on the effect of pH on the aggregation of the amyloid beta peptide of Alzheimer’s disease. CAN J CHEM 2016. [DOI: 10.1139/cjc-2015-0036] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The region encompassed by residues 13–23 of the amyloid beta peptide (Aβ(13–23)) of Alzheimer’s disease is the self-recognition site that initiates toxic oligomerization and fibrillization and also is the site of interaction of Aβ with many other proteins. We describe herein a study by molecular dynamics of N-AcAβ(13–23)NH2 (N-CH3C(O)HHQKLVFFAEDNH2) as a model of full-length Aβ(1–40) or Aβ(1–42) and of its dimers. The effect of pH at or below physiological (pH 7.4) is assessed by protonation of one or more of the His residues. The major conformation of the monomer of the systems is a flexible folded structure. Protonation of one or both His residues does not change the conformation in any significant way. The dimers of protonated and unprotonated systems exist almost exclusively as stable antiparallel β-sheets anchored at both ends by intermolecular salt bridges between Lys16 of one chain and the C-terminal residues Glu22 and Asp23 of the other. We also employ the technique of “umbrella sampling” whereby relative binding affinities of the complexes could be determined. In the case of unsymmetrically protonated species, each complex begins dissociation by releasing the weaker salt bridge, breaking interstrand hydrogen bonds, and losing the β-sheet character. The stronger salt bridge is the last to release and presumably is the first to form in the reverse process of aggregation. Umbrella sampling yields the free energy profiles of the dissociation as a function of the separation of the centres of mass. For each system, the dissociation profile has only a shallow maximum. By implication, the reverse process of assembly has almost no barrier. This is an example of entropy–enthalpy compensation that arises naturally during the molecular dynamics – umbrella sampling simulation.
Collapse
Affiliation(s)
- Stanley K.A. Opare
- Department of Chemistry, University of Calgary, Calgary, AB T2N 1N4, Canada
- Department of Chemistry, University of Calgary, Calgary, AB T2N 1N4, Canada
| | - Anahit Petoyan
- Department of Chemistry, University of Calgary, Calgary, AB T2N 1N4, Canada
- Department of Chemistry, University of Calgary, Calgary, AB T2N 1N4, Canada
| | - Banafsheh Mehrazma
- Department of Chemistry, University of Calgary, Calgary, AB T2N 1N4, Canada
- Department of Chemistry, University of Calgary, Calgary, AB T2N 1N4, Canada
| | - Arvi Rauk
- Department of Chemistry, University of Calgary, Calgary, AB T2N 1N4, Canada
- Department of Chemistry, University of Calgary, Calgary, AB T2N 1N4, Canada
| |
Collapse
|
62
|
Kaffy J, Brinet D, Soulier JL, Correia I, Tonali N, Fera KF, Iacone Y, Hoffmann ARF, Khemtémourian L, Crousse B, Taylor M, Allsop D, Taverna M, Lequin O, Ongeri S. Designed Glycopeptidomimetics Disrupt Protein-Protein Interactions Mediating Amyloid β-Peptide Aggregation and Restore Neuroblastoma Cell Viability. J Med Chem 2016; 59:2025-40. [PMID: 26789783 DOI: 10.1021/acs.jmedchem.5b01629] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
How anti-Alzheimer's drug candidates that reduce amyloid 1-42 peptide fibrillization interact with the most neurotoxic species is far from being understood. We report herein the capacity of sugar-based peptidomimetics to inhibit both Aβ1-42 early oligomerization and fibrillization. A wide range of bio- and physicochemical techniques, such as a new capillary electrophoresis method, nuclear magnetic resonance, and surface plasmon resonance, were used to identify how these new molecules can delay the aggregation of Aβ1-42. We demonstrate that these molecules interact with soluble oligomers in order to maintain the presence of nontoxic monomers and to prevent fibrillization. These compounds totally suppress the toxicity of Aβ1-42 toward SH-SY5Y neuroblastoma cells, even at substoichiometric concentrations. Furthermore, demonstration that the best molecule combines hydrophobic moieties, hydrogen bond donors and acceptors, ammonium groups, and a hydrophilic β-sheet breaker element provides valuable insight for the future structure-based design of inhibitors of Aβ1-42 aggregation.
Collapse
Affiliation(s)
- Julia Kaffy
- Molécules Fluorées et Chimie Médicinale, BioCIS, Univ. Paris-Sud, CNRS, Université Paris Saclay , 5 rue Jean-Baptiste Clément, 92296 Châtenay-Malabry Cedex, France
| | - Dimitri Brinet
- Molécules Fluorées et Chimie Médicinale, BioCIS, Univ. Paris-Sud, CNRS, Université Paris Saclay , 5 rue Jean-Baptiste Clément, 92296 Châtenay-Malabry Cedex, France.,Protéines et Nanotechnologies en Sciences Séparatives, Institut Galien Paris-Sud, Univ. Paris-Sud, CNRS, Université Paris Saclay , 5 rue Jean-Baptiste Clément, 92296 Châtenay-Malabry Cedex, France
| | - Jean-Louis Soulier
- Molécules Fluorées et Chimie Médicinale, BioCIS, Univ. Paris-Sud, CNRS, Université Paris Saclay , 5 rue Jean-Baptiste Clément, 92296 Châtenay-Malabry Cedex, France
| | - Isabelle Correia
- Sorbonne Universités - UPMC Univ Paris 06, Ecole Normale Supérieure - PSL Research University, CNRS UMR 7203 LBM, 4 place Jussieu, 75252 Paris, Cedex 05, France
| | - Nicolo Tonali
- Molécules Fluorées et Chimie Médicinale, BioCIS, Univ. Paris-Sud, CNRS, Université Paris Saclay , 5 rue Jean-Baptiste Clément, 92296 Châtenay-Malabry Cedex, France
| | - Katia Fabiana Fera
- Molécules Fluorées et Chimie Médicinale, BioCIS, Univ. Paris-Sud, CNRS, Université Paris Saclay , 5 rue Jean-Baptiste Clément, 92296 Châtenay-Malabry Cedex, France
| | - Yasmine Iacone
- Molécules Fluorées et Chimie Médicinale, BioCIS, Univ. Paris-Sud, CNRS, Université Paris Saclay , 5 rue Jean-Baptiste Clément, 92296 Châtenay-Malabry Cedex, France.,Protéines et Nanotechnologies en Sciences Séparatives, Institut Galien Paris-Sud, Univ. Paris-Sud, CNRS, Université Paris Saclay , 5 rue Jean-Baptiste Clément, 92296 Châtenay-Malabry Cedex, France
| | - Anaïs R F Hoffmann
- Sorbonne Universités - UPMC Univ Paris 06, Ecole Normale Supérieure - PSL Research University, CNRS UMR 7203 LBM, 4 place Jussieu, 75252 Paris, Cedex 05, France
| | - Lucie Khemtémourian
- Sorbonne Universités - UPMC Univ Paris 06, Ecole Normale Supérieure - PSL Research University, CNRS UMR 7203 LBM, 4 place Jussieu, 75252 Paris, Cedex 05, France
| | - Benoit Crousse
- Molécules Fluorées et Chimie Médicinale, BioCIS, Univ. Paris-Sud, CNRS, Université Paris Saclay , 5 rue Jean-Baptiste Clément, 92296 Châtenay-Malabry Cedex, France
| | - Mark Taylor
- Division of Biomedical and Life Sciences, Faculty of Health and Medicine, Lancaster University , Lancaster LA1 4YQ, U.K
| | - David Allsop
- Division of Biomedical and Life Sciences, Faculty of Health and Medicine, Lancaster University , Lancaster LA1 4YQ, U.K
| | - Myriam Taverna
- Protéines et Nanotechnologies en Sciences Séparatives, Institut Galien Paris-Sud, Univ. Paris-Sud, CNRS, Université Paris Saclay , 5 rue Jean-Baptiste Clément, 92296 Châtenay-Malabry Cedex, France
| | - Olivier Lequin
- Sorbonne Universités - UPMC Univ Paris 06, Ecole Normale Supérieure - PSL Research University, CNRS UMR 7203 LBM, 4 place Jussieu, 75252 Paris, Cedex 05, France
| | - Sandrine Ongeri
- Molécules Fluorées et Chimie Médicinale, BioCIS, Univ. Paris-Sud, CNRS, Université Paris Saclay , 5 rue Jean-Baptiste Clément, 92296 Châtenay-Malabry Cedex, France
| |
Collapse
|
63
|
Zhang Q, Hu X, Wang W, Yuan Z. Study of a Bifunctional Aβ Aggregation Inhibitor with the Abilities of Antiamyloid-β and Copper Chelation. Biomacromolecules 2016; 17:661-8. [PMID: 26756252 DOI: 10.1021/acs.biomac.5b01603] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this study, a bifunctional Aβ aggregation inhibitor peptide, GGHRYYAAFFARR (GR), with the abilities to bind copper and antiamyloid was designed to inhibit the neurotoxicity of the Aβ-Cu(II) complex. The thioflavin T (ThT) assay, turbidimetric analysis, transmission electron microscopy (TEM), and (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) (MTT) assay were used to study its potential inhibitory effect on Aβ aggregation. Our findings indicate that GGH was the specific chelating sequence and that the RYYAAFFARR (RR) component acted as an aggregation inhibitor. More importantly, GR significantly decreased the cytotoxicity of the Aβ-Cu(II) complex. The cell viability improved to 88%, which was higher than with the single functional peptide GGH and RR by 39% and 20%, respectively. Moreover, the qualitative effect of Cu(II) on the Aβ-Cu(II) complex was also studied. Our results indicate that Cu(II) induces the formation of the β-sheet structure with a subequimolar Cu(II):Aβ molar ratio (0.25:1) but led to increased ROS production at a supra-equimolar ratio.
Collapse
Affiliation(s)
- Qian Zhang
- Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, and ‡Collaborative Innovation Center of Chemical Science and Engineering, Nankai University , Tianjin 300071, China
| | - Xiaoyu Hu
- Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, and ‡Collaborative Innovation Center of Chemical Science and Engineering, Nankai University , Tianjin 300071, China
| | - Wei Wang
- Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, and ‡Collaborative Innovation Center of Chemical Science and Engineering, Nankai University , Tianjin 300071, China
| | - Zhi Yuan
- Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, and ‡Collaborative Innovation Center of Chemical Science and Engineering, Nankai University , Tianjin 300071, China
| |
Collapse
|
64
|
Squitti R, Siotto M, Arciello M, Rossi L. Non-ceruloplasmin bound copper and ATP7B gene variants in Alzheimer's disease. Metallomics 2016; 8:863-73. [DOI: 10.1039/c6mt00101g] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
ATP7B, a protein mainly expressed in the hepatocytes, is a copper chaperone that loads the metal into the serum copper–protein ceruloplasmin during its synthesis and also escorts superfluous copper into the bile, by a sophisticated trafficking mechanism.
Collapse
Affiliation(s)
- R. Squitti
- Molecular Markers Laboratory
- IRCCS Istituto Centro San Giovanni di Dio-Fatebenefratelli
- 25125 Brescia, Italy
| | - M. Siotto
- Don Carlo Gnocchi ONLUS Foundation
- Milan, Italy
| | - M. Arciello
- Department of Biology
- University of Rome Tor Vergata
- Rome, Italy
| | - L. Rossi
- Department of Biology
- University of Rome Tor Vergata
- Rome, Italy
- Consorzio Interuniversitario “Istituto Nazionale Biostrutture e Biosistemi” (I.N.B.B.)
- Rome, Italy
| |
Collapse
|
65
|
On the generation of OH(·) radical species from H2O2 by Cu(I) amyloid beta peptide model complexes: a DFT investigation. J Biol Inorg Chem 2015; 21:197-212. [PMID: 26711660 DOI: 10.1007/s00775-015-1322-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2015] [Accepted: 12/08/2015] [Indexed: 12/27/2022]
Abstract
According to different studies, the interaction between amyloid β-peptide (Aβ) and copper ions could yield radical oxygen species production, in particular the highly toxic hydroxyl radical OH(·) that is suspected to contribute to Alzheimer's disease pathogenesis. Despite intensive experimental and computational studies, the nature of the interaction between copper and Aβ peptide, as well as the redox reactivity of the system, are still matter of debate. It was proposed that in Cu(II) → Cu(I) reduction the complex Cu(II)-Aβ could follow a multi-step conformational change with redox active intermediates that may be responsible for OH(·) radical production from H2O2 through a Fenton-like process. The purpose of this work is to evaluate, using ab initio Density Functional Theory computations, the reactivity of different Cu(I)-Aβ coordination modes proposed in the literature, in terms of OH(·) production. For each coordination model, we considered the corresponding H2O2 adduct and performed a potential energy surface scan along the reaction coordinate of O-O bond dissociation of the peroxide, resulting in the production of OH(·) radical, obtaining reaction profiles for the evaluation of the energetic of the process. This procedure allowed us to confirm the hypothesis according to which the most populated Cu(I)-Aβ two-histidine coordination is not able to perform efficiently H2O2 reduction, while a less populated three-coordinated form would be responsible for the OH(·) production. We show that coordination modes featuring a third nitrogen containing electron-donor ligand (an imidazole ring of an histidine residue is slightly favored over the N-terminal amine group) are more active towards H2O2 reduction.
Collapse
|
66
|
Reybier K, Ayala S, Alies B, Rodrigues JV, Bustos Rodriguez S, La Penna G, Collin F, Gomes CM, Hureau C, Faller P. Free Superoxide is an Intermediate in the Production of H2O2 by Copper(I)-Aβ Peptide and O2. Angew Chem Int Ed Engl 2015; 55:1085-9. [PMID: 26629876 DOI: 10.1002/anie.201508597] [Citation(s) in RCA: 78] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2015] [Indexed: 11/06/2022]
Abstract
Oxidative stress is considered as an important factor and an early event in the etiology of Alzheimer's disease (AD). Cu bound to the peptide amyloid-β (Aβ) is found in AD brains, and Cu-Aβ could contribute to this oxidative stress, as it is able to produce in vitro H2O2 and HO˙ in the presence of oxygen and biological reducing agents such as ascorbate. The mechanism of Cu-Aβ-catalyzed H2O2 production is however not known, although it was proposed that H2O2 is directly formed from O2 via a 2-electron process. Here, we implement an electrochemical setup and use the specificity of superoxide dismutase-1 (SOD1) to show, for the first time, that H2O2 production by Cu-Aβ in the presence of ascorbate occurs mainly via a free O2˙(-) intermediate. This finding radically changes the view on the catalytic mechanism of H2O2 production by Cu-Aβ, and opens the possibility that Cu-Aβ-catalyzed O2˙(-) contributes to oxidative stress in AD, and hence may be of interest.
Collapse
Affiliation(s)
- Karine Reybier
- University of Toulouse, UPS; UMR 152 PHARMA-DEV, 118 route de Narbonne, 31062, Toulouse cedex 9, France. .,IRD, UMR 152, 31062, Toulouse cedex 9, France.
| | - Sara Ayala
- 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
| | - Bruno Alies
- 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
| | - João V Rodrigues
- Instituto Tecnologia Química e Biológica, Universidade Nova de Lisboa, Oeiras, Portugal.,Harvard University, Department of Chemistry and Chemical Biology, Cambridge, MA, USA
| | - Susana Bustos Rodriguez
- 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
| | - Giovanni La Penna
- CNR - National Research Council of Italy, ICCOM - Institute for Chemistry of Organo-Metallic Compounds, via Madonna del Piano 10, 50019 Sesto Fiorentino, Firenze, Italy
| | - Fabrice Collin
- University of Toulouse, UPS; UMR 152 PHARMA-DEV, 118 route de Narbonne, 31062, Toulouse cedex 9, France.,IRD, UMR 152, 31062, Toulouse cedex 9, France.,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
| | - Cláudio M Gomes
- Instituto Tecnologia Química e Biológica, Universidade Nova de Lisboa, Oeiras, Portugal.,Faculdade de Ciências, Biosystems and Integrative Sciences Institute, Department of Chemistry and Biochemistry, Universidade de Lisboa, Campo Grande, Lisboa, Portugal
| | - 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
| | - Peter Faller
- 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. .,Institute de Chimie (UMR 7177), 4 rue B. Pascal, 67081, Strasbourg, France.
| |
Collapse
|
67
|
Reybier K, Ayala S, Alies B, Rodrigues JV, Bustos Rodriguez S, La Penna G, Collin F, Gomes CM, Hureau C, Faller P. Free Superoxide is an Intermediate in the Production of H
2
O
2
by Copper(I)‐Aβ Peptide and O
2. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201508597] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Karine Reybier
- University of Toulouse, UPS; UMR 152 PHARMA-DEV 118 route de Narbonne 31062 Toulouse cedex 9 France
- IRD, UMR 152 31062 Toulouse cedex 9 France
| | - Sara Ayala
- 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
| | - Bruno Alies
- 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
| | - João V. Rodrigues
- Instituto Tecnologia Química e Biológica Universidade Nova de Lisboa Oeiras Portugal
- Harvard University Department of Chemistry and Chemical Biology Cambridge MA USA
| | - Susana Bustos Rodriguez
- 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
| | - Giovanni La Penna
- CNR – National Research Council of Italy ICCOM – Institute for Chemistry of Organo-Metallic Compounds via Madonna del Piano 10 50019 Sesto Fiorentino Firenze Italy
| | - Fabrice Collin
- University of Toulouse, UPS; UMR 152 PHARMA-DEV 118 route de Narbonne 31062 Toulouse cedex 9 France
- IRD, UMR 152 31062 Toulouse cedex 9 France
- 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
| | - Cláudio M. Gomes
- Instituto Tecnologia Química e Biológica Universidade Nova de Lisboa Oeiras Portugal
- Faculdade de Ciências, Biosystems and Integrative Sciences Institute Department of Chemistry and Biochemistry Universidade de Lisboa, Campo Grande Lisboa Portugal
| | - 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
| | - Peter Faller
- 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
- Institute de Chimie (UMR 7177) 4 rue B. Pascal 67081 Strasbourg France
| |
Collapse
|
68
|
Abstract
Alzheimer disease (AD) is a fatal progressive disease and the most common form of dementia without effective treatments. Previous studies support that the disruption of endoplasmic reticulum Ca through overactivation of ryanodine receptors plays an important role in the pathogenesis of AD. Normalization of intracellular Ca homeostasis could be an effective strategy for AD therapies. Dantrolene, an antagonist of ryanodine receptors and an FDA-approved drug for clinical treatment of malignant hyperthermia and muscle spasms, exhibits neuroprotective effects in multiple models of neurodegenerative disorders. Recent preclinical studies consistently support the therapeutic effects of dantrolene in various types of AD animal models and were summarized in the current review.
Collapse
|
69
|
The Role of Oxidative Stress-Induced Epigenetic Alterations in Amyloid-β Production in Alzheimer's Disease. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2015; 2015:604658. [PMID: 26543520 PMCID: PMC4620382 DOI: 10.1155/2015/604658] [Citation(s) in RCA: 86] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/10/2014] [Accepted: 12/15/2014] [Indexed: 11/17/2022]
Abstract
An increasing number of studies have proposed a strong correlation between reactive oxygen species (ROS)-induced oxidative stress (OS) and the pathogenesis of Alzheimer's disease (AD). With over five million people diagnosed in the United States alone, AD is the most common type of dementia worldwide. AD includes progressive neurodegeneration, followed by memory loss and reduced cognitive ability. Characterized by the formation of amyloid-beta (Aβ) plaques as a hallmark, the connection between ROS and AD is compelling. Analyzing the ROS response of essential proteins in the amyloidogenic pathway, such as amyloid-beta precursor protein (APP) and beta-secretase (BACE1), along with influential signaling programs of nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB) and c-Jun N-terminal kinase (JNK), has helped visualize the path between OS and Aβ overproduction. In this review, attention will be paid to significant advances in the area of OS, epigenetics, and their influence on Aβ plaque assembly. Additionally, we aim to discuss available treatment options for AD that include antioxidant supplements, Asian traditional medicines, metal-protein-attenuating compounds, and histone modifying inhibitors.
Collapse
|
70
|
Lu N, Li J, Gao Z. Key roles of Tyr 10 in Cu bound Aβ complexes and its relevance to Alzheimer's disease. Arch Biochem Biophys 2015; 584:1-9. [PMID: 26247837 DOI: 10.1016/j.abb.2015.07.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Accepted: 07/08/2015] [Indexed: 11/26/2022]
Abstract
Recent studies show that the accumulation of redox-active Cu mediates the aggregation of amyloid β-peptide (Aβ) and conspicuous oxidative damage to the brain in Alzheimer's disease (AD). However, the key roles for Tyr 10 in Aβ-Cu(II) complex and its potential biological relevance to AD etiology under oxidative stress, were not stressed enough. Interestingly, our results indicated that Aβ40 (not Aβ16)-Cu(II) complex showed obviously enhanced peroxidase activity than free Cu(II). Although Tyr 10 was not the residue binding Cu(II), the mutation of Tyr 10 residue in Aβ40 decreased the peroxidase activity of Aβ40-Cu(II) complex, and the mutation of Tyr 10 could inhibit Aβ40 aggregation. Under oxidative and nitrative stress conditions, the Aβ-Cu(II) complex caused oxidation and nitration of the Aβ Tyr 10 residue through peroxidase-like reactions, where the formation of Cu(I) and hydroxyl radical (OH) was proposed as a chemical mechanism. We also showed that, when Aβ40 aggregates were bound to Cu(II), they retained peroxidase-like activity. Therefore, Tyr 10 residue is pivotal in Aβ-Cu(II) complex and shows important relevance to oxidative stress, implicating the novel significance of Tyr 10 residue as well as Aβ-Cu(II) complex in the pathology of AD.
Collapse
Affiliation(s)
- Naihao Lu
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Key Laboratory of Green Chemistry, Jiangxi Province and College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, China.
| | - Jiayu Li
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Key Laboratory of Green Chemistry, Jiangxi Province and College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, China
| | - Zhonghong Gao
- School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
| |
Collapse
|
71
|
Stamatelopoulos K, Sibbing D, Rallidis LS, Georgiopoulos G, Stakos D, Braun S, Gatsiou A, Sopova K, Kotakos C, Varounis C, Tellis CC, Kastritis E, Alevizaki M, Tselepis AD, Alexopoulos P, Laske C, Keller T, Kastrati A, Dimmeler S, Zeiher AM, Stellos K. Amyloid-beta (1-40) and the risk of death from cardiovascular causes in patients with coronary heart disease. J Am Coll Cardiol 2015; 65:904-16. [PMID: 25744007 DOI: 10.1016/j.jacc.2014.12.035] [Citation(s) in RCA: 78] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/09/2014] [Revised: 12/09/2014] [Accepted: 12/14/2014] [Indexed: 11/27/2022]
Abstract
BACKGROUND The amyloid beta peptide is the major protein constituent of neuritic plaques in Alzheimer disease and appears to play a central role in vascular inflammation pathophysiology. OBJECTIVES This study sought to determine the clinical value of amyloid-beta 1-40 (Abeta40) measurement in predicting cardiovascular (CV) mortality in patients with coronary heart disease (CHD) and arterial stiffness progression in young healthy subjects. METHODS Abeta40 was retrospectively measured in blood samples collected from 3 independent prospective cohorts and 2 case-control cohorts (total N = 1,464). Major adverse cardiac events (MACE) were assessed in the 2 prospective cohorts (n = 877) followed for a median of 4.4 years. To look at effects on subclinical disease, arterial stiffness was evaluated at baseline and after 5-year follow-up (n = 107) in young healthy subjects. The primary endpoint was the predictive value of Abeta40 for CV mortality and outcomes in patients with CHD. RESULTS In Cox proportional hazards models adjusted for age, sex, estimated glomerular filtration rate, left ventricular ejection fraction, high-sensitivity C-reactive protein, and high-sensitivity troponin T, Abeta40 independently predicted CV death and MACE in patients with CHD (p < 0.05 for all). After multivariate adjustment, Abeta40 levels conferred a substantial enhancement of net reclassification index and integrated discrimination improvement of individuals at risk in the total combined CHD cohort over the best predictive model. Further cohort-based analysis revealed that Abeta40 levels were significantly and independently associated with arterial stiffness progression, incident subclinical atherosclerosis, and incident CHD. CONCLUSIONS Measuring blood levels of Abeta40 identified patients at high risk for CV death.
Collapse
Affiliation(s)
- Kimon Stamatelopoulos
- Department of Clinical Therapeutics, Alexandra Hospital, University of Athens, Athens, Greece
| | - Dirk Sibbing
- Medizinische Klinik und Poliklinik I, Ludwig-Maximilians-Universität München, Munich, Germany; DZHK (German Center for Cardiovascular Research), partner site Munich Heart Alliance, Munich, Germany
| | - Loukianos S Rallidis
- Second Department of Cardiology, Attikon Hospital, School of Medicine, University of Athens, Athens, Greece
| | - Georgios Georgiopoulos
- Department of Clinical Therapeutics, Alexandra Hospital, University of Athens, Athens, Greece
| | - Dimitrios Stakos
- Cardiology Clinic, Democritus University of Thrace, Alexandroupolis, Greece
| | - Siegmund Braun
- Deutsches Herzzentrum, Technische Universität, Munich, Germany
| | - Aikaterini Gatsiou
- Institute of Cardiovascular Regeneration, Centre of Molecular Medicine, J.W. Goethe University Frankfurt, Frankfurt am Main, Germany
| | - Kateryna Sopova
- Department of Cardiology, J.W. Goethe University Frankfurt, Frankfurt am Main, Germany
| | - Christos Kotakos
- Second Department of Cardiology, Attikon Hospital, School of Medicine, University of Athens, Athens, Greece
| | - Christos Varounis
- Second Department of Cardiology, Attikon Hospital, School of Medicine, University of Athens, Athens, Greece
| | - Constantinos C Tellis
- Atherothrombosis Research Center/Department of Chemistry, University of Ioannina, Ioannina, Greece
| | - Efstathios Kastritis
- Department of Clinical Therapeutics, Alexandra Hospital, University of Athens, Athens, Greece
| | - Maria Alevizaki
- Department of Clinical Therapeutics, Alexandra Hospital, University of Athens, Athens, Greece
| | - Alexandros D Tselepis
- Atherothrombosis Research Center/Department of Chemistry, University of Ioannina, Ioannina, Greece
| | - Panagiotis Alexopoulos
- Department of Psychiatry and Psychotherapy, Technische Universität München, Munich, Germany
| | - Christoph Laske
- Department of Psychiatry and Psychotherapy, University of Tübingen, Tübingen, Germany; Section for Dementia Research, Hertie-Institute of Clinical Brain Research, Tübingen, Germany; DZNE, German Center for Neurodegenerative Diseases, Tübingen, Germany
| | - Till Keller
- Department of Cardiology, J.W. Goethe University Frankfurt, Frankfurt am Main, Germany; German Center of Cardiovascular Research, Frankfurt, Germany
| | - Adnan Kastrati
- Deutsches Herzzentrum, Technische Universität, Munich, Germany; DZHK (German Center for Cardiovascular Research), partner site Munich Heart Alliance, Munich, Germany
| | - Stefanie Dimmeler
- Institute of Cardiovascular Regeneration, Centre of Molecular Medicine, J.W. Goethe University Frankfurt, Frankfurt am Main, Germany; German Center of Cardiovascular Research, Frankfurt, Germany
| | - Andreas M Zeiher
- Department of Cardiology, J.W. Goethe University Frankfurt, Frankfurt am Main, Germany; German Center of Cardiovascular Research, Frankfurt, Germany
| | - Konstantinos Stellos
- Institute of Cardiovascular Regeneration, Centre of Molecular Medicine, J.W. Goethe University Frankfurt, Frankfurt am Main, Germany; Department of Cardiology, J.W. Goethe University Frankfurt, Frankfurt am Main, Germany; German Center of Cardiovascular Research, Frankfurt, Germany.
| |
Collapse
|
72
|
Wang C, Wang K, Wang Z. Development of gold nanoparticle based colorimetric method for quantitatively studying the inhibitors of Cu2+/Zn2+ induced β-amyloid peptide assembly. Anal Chim Acta 2015; 858:42-8. [DOI: 10.1016/j.aca.2014.12.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2014] [Revised: 11/27/2014] [Accepted: 12/02/2014] [Indexed: 11/24/2022]
|
73
|
Rajasekhar K, Chakrabarti M, Govindaraju T. Function and toxicity of amyloid beta and recent therapeutic interventions targeting amyloid beta in Alzheimer's disease. Chem Commun (Camb) 2015; 51:13434-50. [DOI: 10.1039/c5cc05264e] [Citation(s) in RCA: 149] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Our Feature Article details the physiological role of amyloid beta (Aβ), elaborates its toxic effects and outlines therapeutic molecules designed in the last two years targeting different aspects of Aβ for preventing AD.
Collapse
Affiliation(s)
- K. Rajasekhar
- Bioorganic Chemistry Laboratory
- New Chemistry Unit
- Jawaharlal Nehru Centre for Advanced Scientific Research
- Bengaluru 560064
- India
| | - Malabika Chakrabarti
- Bioorganic Chemistry Laboratory
- New Chemistry Unit
- Jawaharlal Nehru Centre for Advanced Scientific Research
- Bengaluru 560064
- India
| | - T. Govindaraju
- Bioorganic Chemistry Laboratory
- New Chemistry Unit
- Jawaharlal Nehru Centre for Advanced Scientific Research
- Bengaluru 560064
- India
| |
Collapse
|
74
|
Tomasello MF, Sinopoli A, Pappalardo G. On the Environmental Factors Affecting the Structural and Cytotoxic Properties of IAPP Peptides. J Diabetes Res 2015; 2015:918573. [PMID: 26582441 PMCID: PMC4637107 DOI: 10.1155/2015/918573] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/27/2014] [Accepted: 02/05/2015] [Indexed: 12/18/2022] Open
Abstract
Pancreatic islets in type 2 diabetes mellitus (T2DM) patients are characterized by reduced β-cells mass and diffuse extracellular amyloidosis. Amyloid deposition involves the islet amyloid polypeptide (IAPP), a neuropancreatic hormone cosecreted with insulin by β-cells. IAPP is physiologically involved in glucose homeostasis, but it may turn toxic to β-cells owing to its tendency to misfold giving rise to oligomers and fibrils. The process by which the unfolded IAPP starts to self-assemble and the overall factors promoting this conversion are poorly understood. Other open questions are related to the nature of the IAPP toxic species and how exactly β-cells die. Over the last decades, there has been growing consensus about the notion that early molecular assemblies, notably small hIAPP oligomers, are the culprit of β-cells decline. Numerous environmental factors might affect the conformational, aggregation, and cytotoxic properties of IAPP. Herein we review recent progress in the field, focusing on the influences that membranes, pH, and metal ions may have on the conformational conversion and cytotoxicity of full-length IAPP as well as peptide fragments thereof. Current theories proposed for the mechanisms of toxicity will be also summarized together with an outline of the underlying molecular links between IAPP and amyloid beta (Aβ) misfolding.
Collapse
Affiliation(s)
| | - Alessandro Sinopoli
- International PhD Program in Translational Biomedicine, University of Catania, Viale A. Doria 6, 95125 Catania, Italy
| | - Giuseppe Pappalardo
- CNR Institute of Biostructures and Bioimaging, Via P. Gaifami 18, 95126 Catania, Italy
- *Giuseppe Pappalardo:
| |
Collapse
|
75
|
Benseny-Cases N, Klementieva O, Cotte M, Ferrer I, Cladera J. Microspectroscopy (μFTIR) reveals co-localization of lipid oxidation and amyloid plaques in human Alzheimer disease brains. Anal Chem 2014; 86:12047-54. [PMID: 25415602 DOI: 10.1021/ac502667b] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Amyloid peptides are the main component of one of the characteristic pathological hallmarks of Alzheimer's disease (AD): senile plaques. According to the amyloid cascade hypothesis, amyloid peptides may play a central role in the sequence of events that leads to neurodegeneration. However, there are other factors, such as oxidative stress, that may be crucial for the development of the disease. In the present paper, we show that it is possible, by using Fourier tranform infrared (FTIR) microscopy, to co-localize amyloid deposits and lipid peroxidation in tissue slides from patients affected by Alzheimer's disease. Plaques and lipids can be analyzed in the same sample, making use of the characteristic infrared bands for peptide aggregation and lipid oxidation. The results show that, in samples from patients diagnosed with AD, the plaques and their immediate surroundings are always characterized by the presence of oxidized lipids. As for samples from non-AD individuals, those without amyloid plaques show a lower level of lipid oxidation than AD individuals. However, it is known that plaques can be detected in the brains of some non-AD individuals. Our results show that, in such cases, the lipid in the plaques and their surroundings display oxidation levels that are similar to those of tissues with no plaques. These results point to lipid oxidation as a possible key factor in the path that goes from showing the typical neurophatological hallmarks to suffering from dementia. In this process, the oxidative power of the amyloid peptide, possibly in the form of nonfibrillar aggregates, could play a central role.
Collapse
Affiliation(s)
- Núria Benseny-Cases
- European Synchrotron Radiation Facility, 71 Avenue des Martyrs, F-38000 Grenoble, France
| | | | | | | | | |
Collapse
|
76
|
Liu-Smith F, Poe C, Farmer PJ, Meyskens FL. Amyloids, melanins and oxidative stress in melanomagenesis. Exp Dermatol 2014; 24:171-4. [PMID: 25271672 DOI: 10.1111/exd.12559] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/24/2014] [Indexed: 12/26/2022]
Abstract
Melanoma has traditionally been viewed as an ultraviolet (UV) radiation-induced malignancy. While UV is a common inducing factor, other endogenous stresses such as metal ion accumulation or the melanin pigment itself may provide alternative pathways to melanoma progression. Eumelanosomes within melanoma often exhibit disrupted membranes and fragmented pigment which may be due to alterations in their amyloid-based striated matrix. The melanosomal amyloid can itself be toxic, especially in combination with reactive oxygen species (ROS) and reactive nitrogen species (RNS) generated by endogenous NADPH oxidase (NOX) and nitric oxide synthase (NOS) enzymes, a toxic mix that may initiate melanomagenesis. Further understanding of the loss of the melanosomal organization, the behaviour of the exposed melanin and the induction of ROS/RNS in melanomas may provide critical insights into this deadly disease.
Collapse
Affiliation(s)
- Feng Liu-Smith
- Department of Epidemiology, University of California School of Medicine, Irvine, CA, USA; Department of Medicine, University of California School of Medicine, Irvine, CA, USA; Chao Family Comprehensive Cancer Center, University of California School of Medicine, Irvine, CA, USA
| | | | | | | |
Collapse
|