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Pariary R, Shome G, Kalita S, Kalita S, Roy A, Harikishore A, Jana K, Senapati D, Mandal B, Mandal AK, Bhunia A. Peptide-Based Strategies: Combating Alzheimer's Amyloid β Aggregation through Ergonomic Design and Fibril Disruption. Biochemistry 2024; 63:2397-2413. [PMID: 39255071 DOI: 10.1021/acs.biochem.4c00371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/12/2024]
Abstract
Amyloidosis of amyloid-β (Aβ) triggers a cascade of events, leading to oxidative damage and neuronal death. Therefore, inhibiting Aβ amyloidosis or disrupting the matured fibrils is the primary target to combat progressive Alzheimer's disease (AD) pathogenesis. Here, we undertake optimization strategies to improve the antiamyloid efficiency of our previously reported NF11 (NAVRWSLMRPF) peptide. Among the series of peptides tested, nontoxic and serum-stable peptide 1 or P1 containing an anthranilic acid residue shows immense potential in not only inhibiting the Aβ42 amyloid formation but also disrupting the mature Aβ42 fibrils into nontoxic small molecular weight soluble species. Our studies provide high-resolution characterization of the peptide's mechanism of action. With a binding affinity within the micromolar range for both the monomer and aggregated Aβ42, this α/β hybrid peptide can efficiently modulate Aβ amyloidosis while facilitating the clearance of toxic aggregates and enforcing protection from apoptosis. Thus, our studies highlight that incorporating a β-amino acid not only imparts protection from proteolytic degradation and improved stability but also functions effectively as a β breaker, redirecting the aggregation kinetics toward off-pathway fibrillation.
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Affiliation(s)
- Ranit Pariary
- Department of Chemical Sciences, Bose Institute, Unified Academic Campus, Salt Lake, EN 80, Kolkata 700 091, India
| | - Gourav Shome
- Department of Biological Sciences, Bose Institute, Unified Academic Campus, Salt Lake, EN 80, Kolkata 700 091, India
| | - Sujan Kalita
- Department of Chemistry, Indian Institute of Technology Guwahati, North Guwahati 781039, India
- Department of Chemistry, Kamrup College Chamata, Nalbari 781306, India
| | - Sourav Kalita
- Department of Chemistry, Indian Institute of Technology Guwahati, North Guwahati 781039, India
- Department of Chemistry, North Gauhati College, North Guwahati 781031, India
| | - Anuradha Roy
- Chemical Sciences Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata 700 064, India
| | - Amaravadhi Harikishore
- School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, Singapore 63755, Singapore
| | - Kuladip Jana
- Department of Biological Sciences, Bose Institute, Unified Academic Campus, Salt Lake, EN 80, Kolkata 700 091, India
| | - Dulal Senapati
- Chemical Sciences Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata 700 064, India
| | - Bhubaneswar Mandal
- Department of Chemistry, Indian Institute of Technology Guwahati, North Guwahati 781039, India
| | - Atin Kumar Mandal
- Department of Biological Sciences, Bose Institute, Unified Academic Campus, Salt Lake, EN 80, Kolkata 700 091, India
| | - Anirban Bhunia
- Department of Chemical Sciences, Bose Institute, Unified Academic Campus, Salt Lake, EN 80, Kolkata 700 091, India
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2
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Palmioli A, Airoldi C. An NMR Toolkit to Probe Amyloid Oligomer Inhibition in Neurodegenerative Diseases: From Ligand Screening to Dissecting Binding Topology and Mechanisms of Action. Chempluschem 2024:e202400243. [PMID: 38712695 DOI: 10.1002/cplu.202400243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2024] [Revised: 05/03/2024] [Accepted: 05/06/2024] [Indexed: 05/08/2024]
Abstract
The aggregation of amyloid peptides and proteins into toxic oligomers is a hallmark of neurodegenerative diseases, such as Alzheimer's disease, Parkinson's disease, Machado-Joseph's disease, and transmissible spongiform encephalopathies. Inhibition of amyloid oligomers formation and interactions with biological counterparts, as well as the triggering of non-toxic amorphous aggregates, are strategies towards preventive interventions against these pathologies. NMR spectroscopy addresses the need for structural characterization of amyloid proteins and their aggregates, their binding to inhibitors, and rapid screening of compound libraries for ligand identification. Here we briefly discuss the solution experiments constituting the NMR spectroscopist's toolkit and provide examples of their application.
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Affiliation(s)
- Alessandro Palmioli
- Department of Biotechnology and Biosciences, University of Milano - Bicocca, P.zza della Scienza 2, 20126, Milan, Italy
| | - Cristina Airoldi
- Department of Biotechnology and Biosciences, University of Milano - Bicocca, P.zza della Scienza 2, 20126, Milan, Italy
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3
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Sarkar D, Bhunia A. Delineating the Role of GxxxG Motif in Amyloidogenesis: A New Perspective in Targeting Amyloid-Beta Mediated AD Pathogenesis. ACS BIO & MED CHEM AU 2024; 4:4-19. [PMID: 38404748 PMCID: PMC10885112 DOI: 10.1021/acsbiomedchemau.3c00055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Revised: 10/18/2023] [Accepted: 10/18/2023] [Indexed: 02/27/2024]
Abstract
The pursuit of a novel structural motif that can shed light on the key functional attributes is a primary focus in the study of protein folding disorders. Decades of research on Alzheimer's disease (AD) have centered on the Amyloid β (Aβ) pathway, highlighting its significance in understanding the disorder. The diversity in the Aβ pathway and the possible silent tracks which are yet to discover, makes it exceedingly intimidating to the interdisciplinary scientific community. Over the course of AD research, Aβ has consistently been at the forefront of scientific inquiry and discussion. In this review, we epitomize the role of a potential structural motif (GxxxG motif) that may provide a new horizon to the Aβ conflict. We emphasize on how comprehensive understanding of this motif from a structure-function perspective may pave the way for designing novel therapeutics intervention in AD and related diseases.
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Affiliation(s)
- Dibakar Sarkar
- Department of Chemical Sciences, Bose Institute, Unified Academic Campus, Sector V, Salt Lake EN
80, Kolkata 700 091, India
| | - Anirban Bhunia
- Department of Chemical Sciences, Bose Institute, Unified Academic Campus, Sector V, Salt Lake EN
80, Kolkata 700 091, India
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4
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Roy D, Maity NC, Kumar S, Maity A, Ratha BN, Biswas R, Maiti NC, Mandal AK, Bhunia A. Modulatory role of copper on hIAPP aggregation and toxicity in presence of insulin. Int J Biol Macromol 2023; 241:124470. [PMID: 37088193 DOI: 10.1016/j.ijbiomac.2023.124470] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Revised: 03/24/2023] [Accepted: 04/12/2023] [Indexed: 04/25/2023]
Abstract
Aggregation of the human islets amyloid polypeptide, or hIAPP, is linked to β-cell death in type II diabetes mellitus (T2DM). Different pancreatic β-cell environmental variables such as pH, insulin and metal ions play a key role in controlling the hIAPP aggregation. Since insulin and hIAPP are co-secreted, it is known from numerous studies that insulin suppresses hIAPP fibrillation by preventing the initial dimerization process. On the other hand, zinc and copper each have an inhibitory impact on hIAPP fibrillation, but copper promotes the production of toxic oligomers. Interestingly, the insulin oligomeric equilibrium is controlled by the concentration of zinc ions when the effect of insulin and zinc has been tested together. Lower zinc concentrations cause the equilibrium to shift towards the monomer and dimer states of insulin, which bind to monomeric hIAPP and stop it from developing into a fibril. On the other hand, the combined effects of copper and insulin have not yet been done. In this study, we have demonstrated how the presence of copper affects hIAPP aggregation and the toxicity of the resultant conformers with or without insulin. For this purpose, we have used a set of biophysical techniques, including NMR, fluorescence, CD etc., in combination with AFM and cell cytotoxicity assay. In the presence and/or absence of insulin, copper induces hIAPP to form structurally distinct stable toxic oligomers, deterring the fibrillation process. More specifically, the oligomers generated in the presence of insulin have slightly higher toxicity than those formed in the absence of insulin. This research will increase our understanding of the combined modulatory effect of two β-cell environmental factors on hIAPP aggregation.
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Affiliation(s)
- Dipanwita Roy
- Department of Biophysics, Bose Institute, Unified Academic Campus, Salt Lake, Sctor V, Kolkata 700091, India
| | - Narayan Chandra Maity
- Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Sector-III, Salt Lake, Kolkata 700106, India
| | - Sourav Kumar
- Department of Biophysics, Bose Institute, Unified Academic Campus, Salt Lake, Sctor V, Kolkata 700091, India
| | - Anupam Maity
- Structural Biology and Bioinformatics, CSIR-Indian Institute of Chemical Biology, 4 Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India
| | - Bhisma N Ratha
- Department of Biophysics, Bose Institute, Unified Academic Campus, Salt Lake, Sctor V, Kolkata 700091, India
| | - Ranjit Biswas
- Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Sector-III, Salt Lake, Kolkata 700106, India
| | - Nakul Chandra Maiti
- Structural Biology and Bioinformatics, CSIR-Indian Institute of Chemical Biology, 4 Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India
| | - Atin Kumar Mandal
- Division of Molecular Medicine, Bose Institute, Unified Academic Campus, Salt Lake, Sctor V, Kolkata, 700091, India
| | - Anirban Bhunia
- Department of Biophysics, Bose Institute, Unified Academic Campus, Salt Lake, Sctor V, Kolkata 700091, India.
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5
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Yang J, Wang X, Liu J, Chi W, Zhang L, Xiao L, Yan JW. Near-Infrared Photooxygenation Theranostics Used for the Specific Mapping and Modulating of Amyloid-β Aggregation. Anal Chem 2022; 94:15902-15907. [DOI: 10.1021/acs.analchem.2c04042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Jinrong Yang
- MOE International Joint Research Laboratory on Synthetic Biology and Medicines, School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, PR China
| | - Xin Wang
- State Key Laboratory of Medicinal Chemical Biology, Tianjin Key Laboratory of Biosensing and Molecular Recognition, College of Chemistry, Nankai University, Tianjin 300071, PR China
| | - Jinsheng Liu
- MOE International Joint Research Laboratory on Synthetic Biology and Medicines, School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, PR China
| | - Weijie Chi
- Department of Chemistry, School of Science, Hainan University, Haikou 570228, PR China
| | - Lei Zhang
- MOE International Joint Research Laboratory on Synthetic Biology and Medicines, School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, PR China
| | - Lehui Xiao
- State Key Laboratory of Medicinal Chemical Biology, Tianjin Key Laboratory of Biosensing and Molecular Recognition, College of Chemistry, Nankai University, Tianjin 300071, PR China
| | - Jin-wu Yan
- MOE International Joint Research Laboratory on Synthetic Biology and Medicines, School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, PR China
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Tatulian SA. Challenges and hopes for Alzheimer's disease. Drug Discov Today 2022; 27:1027-1043. [PMID: 35121174 DOI: 10.1016/j.drudis.2022.01.016] [Citation(s) in RCA: 99] [Impact Index Per Article: 49.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 09/01/2021] [Accepted: 01/27/2022] [Indexed: 12/11/2022]
Abstract
Recent drug development efforts targeting Alzheimer's disease (AD) have failed to produce effective disease-modifying agents for many reasons, including the substantial presymptomatic neuronal damage that is caused by the accumulation of the amyloid β (Aβ) peptide and tau protein abnormalities, deleterious adverse effects of drug candidates, and inadequate design of clinical trials. New molecular targets, biomarkers, and diagnostic techniques, as well as alternative nonpharmacological approaches, are sorely needed to detect and treat early pathological events. This article analyzes the successes and debacles of pharmaceutical endeavors to date, and highlights new technologies that may lead to the more effective diagnosis and treatment of the pathologies that underlie AD. The use of focused ultrasound, deep brain stimulation, stem cell therapy, and gene therapy, in parallel with pharmaceuticals and judicious lifestyle adjustments, holds promise for the deceleration, prevention, or cure of AD and other neurodegenerative disorders.
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Affiliation(s)
- Suren A Tatulian
- Department of Physics, College of Sciences, and Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, FL 32816, USA.
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7
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Ahmed R, Huang J, Lifshitz R, Martinez Pomier K, Melacini G. Structural determinants of the interactions of catechins with Aβ oligomers and lipid membranes. J Biol Chem 2021; 298:101502. [PMID: 34929173 PMCID: PMC8800114 DOI: 10.1016/j.jbc.2021.101502] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Revised: 12/07/2021] [Accepted: 12/13/2021] [Indexed: 02/08/2023] Open
Abstract
The aberrant self-assembly of intrinsically disordered proteins (IDPs) into soluble oligomers and their interactions with biological membranes underlie the pathogenesis of numerous neurodegenerative diseases, including Alzheimer's disease. Catechins have emerged as useful tools to reduce the toxicity of IDP oligomers by modulating their interactions with membranes. However, the structural determinants of catechin binding to IDP oligomers and membranes remain largely elusive. Here, we assemble a catechin library by combining several naturally occurring chemical modifications and, using a coupled NMR-statistical approach, we map at atomic resolution the interactions of such library with the Alzheimer's-associated amyloid-beta (Aβ) oligomers and model membranes. Our results reveal multiple catechin affinity drivers and show that the combination of affinity-reducing covalent changes may lead to unexpected net gains in affinity. Interestingly, we find that the positive cooperativity is more prevalent for Aβ oligomers than membrane binding, and that the determinants underlying catechin recognition by membranes are markedly different from those dissected for Aβ oligomers. Notably, we find that the unanticipated positive cooperativity arises from the critical regulatory role of the gallate catechin moiety, which recruits previously disengaged substituents into the binding interface and leads to an overall greater compaction of the receptor-bound conformation. Overall, the previously elusive structural attributes mapped here provide an unprecedented foundation to establish structure-activity relationships of catechins.
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Affiliation(s)
- Rashik Ahmed
- Department of Chemistry and Chemical Biology, McMaster University, Hamilton, Ontario, Canada
| | - Jinfeng Huang
- Department of Chemistry and Chemical Biology, McMaster University, Hamilton, Ontario, Canada
| | - Romi Lifshitz
- Department of Chemistry and Chemical Biology, McMaster University, Hamilton, Ontario, Canada
| | - Karla Martinez Pomier
- Department of Chemistry and Chemical Biology, McMaster University, Hamilton, Ontario, Canada
| | - Giuseppe Melacini
- Department of Chemistry and Chemical Biology, McMaster University, Hamilton, Ontario, Canada,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada,For correspondence: Giuseppe Melacini
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8
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Effects of Aβ-derived peptide fragments on fibrillogenesis of Aβ. Sci Rep 2021; 11:19262. [PMID: 34584131 PMCID: PMC8479085 DOI: 10.1038/s41598-021-98644-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Accepted: 09/13/2021] [Indexed: 11/08/2022] Open
Abstract
Amyloid β (Aβ) peptide aggregation plays a central role in Alzheimer's disease (AD) etiology. AD drug candidates have included small molecules or peptides directed towards inhibition of Aβ fibrillogenesis. Although some Aβ-derived peptide fragments suppress Aβ fibril growth, comprehensive analysis of inhibitory potencies of peptide fragments along the whole Aβ sequence has not been reported. The aim of this work is (a) to identify the region(s) of Aβ with highest propensities for aggregation and (b) to use those fragments to inhibit Aβ fibrillogenesis. Structural and aggregation properties of the parent Aβ1-42 peptide and seven overlapping peptide fragments have been studied, i.e. Aβ1-10 (P1), Aβ6-15 (P2), Aβ11-20 (P3), Aβ16-25 (P4), Aβ21-30 (P5), Aβ26-36 (P6), and Aβ31-42 (P7). Structural transitions of the peptides in aqueous buffer have been monitored by circular dichroism and Fourier transform infrared spectroscopy. Aggregation and fibrillogenesis were analyzed by light scattering and thioflavin-T fluorescence. The mode of peptide-peptide interactions was characterized by fluorescence resonance energy transfer. Three peptide fragments, P3, P6, and P7, exhibited exceptionally high propensity for β-sheet formation and aggregation. Remarkably, only P3 and P6 exerted strong inhibitory effect on the aggregation of Aβ1-42, whereas P7 and P2 displayed moderate inhibitory potency. It is proposed that P3 and P6 intercalate between Aβ1-42 molecules and thereby inhibit Aβ1-42 aggregation. These findings may facilitate therapeutic strategies of inhibition of Aβ fibrillogenesis by Aβ-derived peptides.
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9
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Breaker peptides against amyloid-β aggregation: a potential therapeutic strategy for Alzheimer's disease. Future Med Chem 2021; 13:1767-1794. [PMID: 34498978 DOI: 10.4155/fmc-2021-0184] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Alzheimer's disease (AD) is a progressive neurodegenerative disorder, for which blocking the early steps of extracellular misfolded amyloid-β (Aβ) aggregation is a promising therapeutic approach. However, the pathological features of AD progression include the accumulation of intracellular tau protein, membrane-catalyzed cell death and the abnormal deposition of Aβ. Here, we focus on anti-amyloid breaker peptides derived from the Aβ sequence and non-Aβ-based peptides containing both natural and modified amino acids. Critical aspects of the breaker peptides include N-methylation, conformational restriction through cyclization, incorporation of unnatural amino acid, fluorinated molecules, polymeric nanoparticles and PEGylation. This review confers a general idea of such breaker peptides with in vitro and in vivo studies, which may advance our understanding of AD pathology and develop an effective treatment strategy against AD.
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10
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Abidi SMS, Dar AI, Acharya A. Multifunctional Gold Nanoparticle-Conjugated Cellulose Nanoonions Alleviate Aβ42 Fibrillation-Induced Toxicity via Regulation of Oxidative Stress and Ion Homeostasis. Biomacromolecules 2021; 22:2419-2435. [PMID: 33945268 DOI: 10.1021/acs.biomac.1c00228] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Inhibition of hen egg white lysozyme (HEWL) and Aβ42 fibrillation have been established as the main models for the treatment of systemic lysozyme amyloidosis and Alzheimer's disease (AD), respectively. Several antiamyloidogenic nanomaterials have been developed over the period; however, their intracellular mechanism of action is still not well understood. In this context, plant-based, gold-conjugated, injectable, hydrophilic cellulose nanoonions (CNOs), viz., DH-CNO (∼60 ± 5 nm) and LC-CNO (∼55 ± 12 nm), were developed from their respective hydrophobic cellulose nanocrystals (DH-CNC and LC-CNC) using a single-step chemical template-mediated process. This unique nanocellulose architecture was chemically and morphologically characterized by various spectroscopic and microscopic techniques. Further, the different biophysical studies documented marked the inhibition/disintegration potential of gold-conjugated LC-CNO against HEWL and Aβ42 peptide aggregation. It was further observed that inhibition of protein fibrillation could be achieved within ∼10 min when the same materials were used under photoirradiation conditions. In vitro protein aggregation studies using HEK293 cells suggested that gold-conjugated LC-CNO could effectively reduce the cellular toxicity via regulation of oxidative stress and ion homeostasis. The outcome of the present study will help in designing cellulose-based novel functional nanochaperones against various neurodegenerative diseases.
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Affiliation(s)
- Syed M S Abidi
- Biotechnology Division, CSIR-Institute of Himalayan Bioresource Technology, Palampur, Himachal Pradesh 176061, India.,Academy of Scientific & Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh201002, India
| | - Aqib Iqbal Dar
- Biotechnology Division, CSIR-Institute of Himalayan Bioresource Technology, Palampur, Himachal Pradesh 176061, India.,Academy of Scientific & Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh201002, India
| | - Amitabha Acharya
- Biotechnology Division, CSIR-Institute of Himalayan Bioresource Technology, Palampur, Himachal Pradesh 176061, India.,Academy of Scientific & Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh201002, India
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11
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Tamil Selvan S, Ravichandar R, Kanta Ghosh K, Mohan A, Mahalakshmi P, Gulyás B, Padmanabhan P. Coordination chemistry of ligands: Insights into the design of amyloid beta/tau-PET imaging probes and nanoparticles-based therapies for Alzheimer’s disease. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2020.213659] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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12
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Mustafa I, Awad A, Fgaier H, Mansur A, Elkamel A. Compartmental modeling and analysis of the effect of β-amyloid on acetylcholine neurocycle via choline leakage hypothesis. Comput Chem Eng 2021. [DOI: 10.1016/j.compchemeng.2020.107165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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13
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Ye Z, Geng X, Wei L, Li Z, Lin S, Xiao L. Length-Dependent Distinct Cytotoxic Effect of Amyloid Fibrils beyond Optical Diffraction Limit Revealed by Nanoscopic Imaging. ACS NANO 2021; 15:934-943. [PMID: 33320527 DOI: 10.1021/acsnano.0c07555] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Fibrillar species have been proposed to play an essential role in the cytotoxicity of amyloid peptide and the pathogenesis of neurodegenerative diseases. Discrimination of Aβ aggregates in situ at high spatial resolution is therefore significant for the development of a therapeutic method. In this work, we adopt a rhodamine-like structure as luminescent centers to fabricate carbonized fluorescent nanoparticles (i.e., carbon dots, RhoCDs) with tunable emission wavelengths from green to red and burst-like photoblinking property for localization-based nanoscopic imaging. These RhoCDs contain lipophilic cationic and carboxyl groups which can specifically bind with Aβ1-40 aggregates via electrostatic interaction and hydrogen bonding. According to the nanoscopic imaging in the Aβ1-40 fibrillation and disaggregation process, different types of Aβ1-40 aggregates beyond the optical diffraction limit have been disclosed. Additionally, length-dependent toxic effect of Aβ1-40 aggregates beyond the optical diffraction limit is unveiled. Short amyloid assemblies with length of 187 ± 3.9 nm in the early stage are more toxic than the elongated amyloid fibrils. Second, disassembly of long fibrils into short species by Gramicidin S (GS-2) peptide might enhance the cytotoxicity. These results lay the foundation to develop functional fluorophore for nanoscopic imaging and also provide deep insight into morphology-dependent cytotoxicity from amyloid peptides.
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Affiliation(s)
- Zhongju Ye
- State Key Laboratory of Medicinal Chemical Biology, Tianjin Key Laboratory of Biosensing and Molecular Recognition, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Xin Geng
- Henan Joint International Research Laboratory of Green Construction of Functional Molecules and Their Bioanalytical Applications, College of Chemistry, Zhengzhou University, Zhengzhou 450001, China
| | - Lin Wei
- College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, China
| | - Zhaohui Li
- Henan Joint International Research Laboratory of Green Construction of Functional Molecules and Their Bioanalytical Applications, College of Chemistry, Zhengzhou University, Zhengzhou 450001, China
| | - Shen Lin
- State Key Laboratory of Medicinal Chemical Biology, Tianjin Key Laboratory of Biosensing and Molecular Recognition, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Lehui Xiao
- State Key Laboratory of Medicinal Chemical Biology, Tianjin Key Laboratory of Biosensing and Molecular Recognition, College of Chemistry, Nankai University, Tianjin 300071, China
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14
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Dubey S, Kallubai M, Subramanyam R. Improving the inhibition of β-amyloid aggregation by withanolide and withanoside derivatives. Int J Biol Macromol 2021; 173:56-65. [PMID: 33465364 DOI: 10.1016/j.ijbiomac.2021.01.094] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Revised: 12/11/2020] [Accepted: 01/14/2021] [Indexed: 12/01/2022]
Abstract
Here, we have studied the ameliorative effects of Withania somnifera derivatives (Withanolide A, Withanolide B, Withanoside IV, and Withanoside V) on the fibril formation of amyloid-β 42 for Alzheimer's disease. We analyzed reduction in the aggregation of β amyloid protein with these Ashwagandha derivatives by Thioflavin T assay in the oligomeric and fibrillar state. We have tested the cytotoxic activity of these compounds against human SK-N-SH cell line for 48 h, and the IC 50 value found to be 28.61 ± 2.91, 14.84 ± 1.45, 18.76 ± 0.76 and 30.14 ± 2.59 μM, respectively. After the treatment of the cells with half the concentration of IC 50 value, there was a remarkable decrease in the number of apoptotic cells stained by TUNEL assay indicating the DNA damage and also observed significant decrease of reactive oxygen species. Also, the binding and molecular stability of these derivatives with amyloid β was also studied using bioinformatics tools where these molecules were interacted at LVFFA region which is inhibition site of amyloid-β1 42. These studies revealed that the Withanolides and Withanosides interact with the hydrophobic core of amyloid-β 1-42 in the oligomeric stage, preventing further interaction with the monomers and diminishing aggregation.
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Affiliation(s)
- Shreya Dubey
- Department of Plant Sciences, School of Life Sciences, University of Hyderabad, Gachibowli, Telangana 500046, India
| | - Monika Kallubai
- Department of Plant Sciences, School of Life Sciences, University of Hyderabad, Gachibowli, Telangana 500046, India
| | - Rajagopal Subramanyam
- Department of Plant Sciences, School of Life Sciences, University of Hyderabad, Gachibowli, Telangana 500046, India.
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15
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Paul A, Kumar S, Kalita S, Kalita S, Sarkar D, Bhunia A, Bandyopadhyay A, Mondal AC, Mandal B. An explicitly designed paratope of amyloid-β prevents neuronal apoptosis in vitro and hippocampal damage in rat brain. Chem Sci 2020; 12:2853-2862. [PMID: 34164050 PMCID: PMC8179358 DOI: 10.1039/d0sc04379f] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Synthetic antibodies hold great promise in combating diseases, diagnosis, and a wide range of biomedical applications. However, designing a therapeutically amenable, synthetic antibody that can arrest the aggregation of amyloid-β (Aβ) remains challenging. Here, we report a flexible, hairpin-like synthetic paratope (SP1, ∼2 kDa), which prevents the aggregation of Aβ monomers and reverses the preformed amyloid fibril to a non-toxic species. Structural and biophysical studies further allowed dissecting the mode and affinity of molecular recognition events between SP1 and Aβ. Subsequently, SP1 reduces Aβ-induced neurotoxicity, neuronal apoptosis, and ROS-mediated oxidative damage in human neuroblastoma cells (SH-SY5Y). The non-toxic nature of SP1 and its ability to ameliorate hippocampal neurodegeneration in a rat model of AD demonstrate its therapeutic potential. This paratope engineering module could readily implement discoveries of cost-effective molecular probes to nurture the basic principles of protein misfolding, thus combating related diseases.
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Affiliation(s)
- Ashim Paul
- Laboratory of Peptide and Amyloid Research, Department of Chemistry, Indian Institute of Technology Guwahati (IITG) North Guwahati Assam-781039 India
| | - Sourav Kumar
- Neuroscience Research Unit, Department of Physiology, Raja Peary Mohan College Hooghly Uttarpara West Bengal-712258 India
| | - Sujan Kalita
- Laboratory of Peptide and Amyloid Research, Department of Chemistry, Indian Institute of Technology Guwahati (IITG) North Guwahati Assam-781039 India
| | - Sourav Kalita
- Laboratory of Peptide and Amyloid Research, Department of Chemistry, Indian Institute of Technology Guwahati (IITG) North Guwahati Assam-781039 India
| | - Dibakar Sarkar
- Biomolecular NMR and Drug Design Laboratory, Department of Biophysics, Bose Institute P-1/12 CIT Scheme VII (M) Kolkata 700054 India
| | - Anirban Bhunia
- Biomolecular NMR and Drug Design Laboratory, Department of Biophysics, Bose Institute P-1/12 CIT Scheme VII (M) Kolkata 700054 India
| | - Anupam Bandyopadhyay
- Peptide Engineering Laboratory, Department of Chemistry, Indian Institute of Technology Ropar Punjab-140001 India
| | - Amal Chandra Mondal
- Neuroscience Research Unit, Department of Physiology, Raja Peary Mohan College Hooghly Uttarpara West Bengal-712258 India .,Laboratory of Cellular & Molecular Neurobiology, School of Life Sciences, Jawaharlal Nehru University New Delhi-110 067 India
| | - Bhubaneswar Mandal
- Laboratory of Peptide and Amyloid Research, Department of Chemistry, Indian Institute of Technology Guwahati (IITG) North Guwahati Assam-781039 India
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16
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Tamil Selvan S, Padmanabhan P, Zoltán Gulyás B. Nanotechnology-Based Diagnostics and Therapy for Pathogen-Related Infections in the CNS. ACS Chem Neurosci 2020; 11:2371-2377. [PMID: 31726008 DOI: 10.1021/acschemneuro.9b00470] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
The central nervous system (CNS) encompasses the brain, spinal cord, and nerves, where both brain and spinal cord are safeguarded by the meninges. However, serious bacterial, viral, or fungal infection in the brain causes life-threatening diseases such as meningitis. Engineered nanostructures hold great promise for not only in the diagnosis but also for combating microbial drug resistance owing to their high surface area and innate antibacterial activity. We delineate several nanoparticle-based approaches to enhance the CNS delivery of drugs across the blood-brain barrier (BBB). While pathogens invade the CNS by phagocytosis or receptor (e.g., EphA2)-mediated transcytosis, most of the nanoparticles cross the BBB via receptor-mediated transcytosis (e.g., antibody, peptide, protein). We also provide our perspectives on the diagnostic pathways based on nanotechnology for the detection of pathogens in the brain, thereby opening up new therapeutic avenues.
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Affiliation(s)
- Subramanian Tamil Selvan
- Translational Neuroscience Laboratory, Lee Kong Chian School of Medicine, Nanyang Technological University, 59 Nanyang Drive, Singapore 636921
| | - Parasuraman Padmanabhan
- Translational Neuroscience Laboratory, Lee Kong Chian School of Medicine, Nanyang Technological University, 59 Nanyang Drive, Singapore 636921
| | - Balázs Zoltán Gulyás
- Translational Neuroscience Laboratory, Lee Kong Chian School of Medicine, Nanyang Technological University, 59 Nanyang Drive, Singapore 636921
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17
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Bera S, Gayen N, Mohid SA, Bhattacharyya D, Krishnamoorthy J, Sarkar D, Choi J, Sahoo N, Mandal AK, Lee D, Bhunia A. Comparison of Synthetic Neuronal Model Membrane Mimics in Amyloid Aggregation at Atomic Resolution. ACS Chem Neurosci 2020; 11:1965-1977. [PMID: 32492332 DOI: 10.1021/acschemneuro.0c00166] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Alzheimer's disease (AD) is a severe neurodegenerative disorder caused by abnormal accumulation of toxic amyloid plaques of the amyloid-beta (Aβ) or the tau proteins in the brain. The plaque deposition leading to the collapse of the cellular integrity is responsible for a myriad of surface phenomena acting at the neuronal lipid interface. Recent years have witnessed dysfunction of the blood-brain barriers (BBB) associated with AD. Several studies support the idea that BBB acts as a platform for the formation of misfolded Aβ peptide, promoting oligomerization and fibrillation, compromising the overall integrity of the central nervous system. While the amyloid plaque deposition has been known to be responsible for the collapse of the BBB membrane integrity, the causal effect relationship between BBB and Aβ amyloidogenesis remains unclear. In this study, we have used physiologically relevant synthetic model membrane systems to gain atomic insight into the functional aspects of the lipid interface. Here, we have used a minimalist BBB mimic, POPC/POPG/cholesterol/GM1, to compare with the native BBB (total lipid brain extract (TLBE)), to understand the molecular events occurring in the membrane-induced Aβ40 amyloid aggregation. Our study showed that the two membrane models accelerated the Aβ40 aggregation kinetics with differential secondary structural transitions of the peptide. The observed structural transitions are defined by the lipid compositions, which in turn undermines the differences in lipid surface phenomena, leading to peptide induced cellular toxicity in the neuronal membrane.
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Affiliation(s)
- Swapna Bera
- Department of Biophysics, Bose Institute, Kolkata 700054, India
| | - Nilanjan Gayen
- Division of Molecular Medicine, Bose Institute, Kolkata 700054, India
| | - Sk. Abdul Mohid
- Department of Biophysics, Bose Institute, Kolkata 700054, India
| | | | | | - Dibakar Sarkar
- Department of Biophysics, Bose Institute, Kolkata 700054, India
| | - Jihye Choi
- Department of Fine Chemistry & Convergence Institute of Biomedical and Biomaterials, Seoul National University of Science and Technology, Seoul 139-743, Korea
| | - Nirakar Sahoo
- Department of Biology, University of Texas Rio Grande Valley, Edinburg, Texas 78539, United States
| | - Atin K. Mandal
- Division of Molecular Medicine, Bose Institute, Kolkata 700054, India
| | - DongKuk Lee
- Department of Fine Chemistry & Convergence Institute of Biomedical and Biomaterials, Seoul National University of Science and Technology, Seoul 139-743, Korea
| | - Anirban Bhunia
- Department of Biophysics, Bose Institute, Kolkata 700054, India
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18
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Nie RZ, Huo YQ, Yu B, Liu CJ, Zhou R, Bao HH, Tang SW. Molecular insights into the inhibitory mechanisms of gallate moiety on the Aβ 1-40 amyloid aggregation: A molecular dynamics simulation study. Int J Biol Macromol 2020; 156:40-50. [PMID: 32275992 DOI: 10.1016/j.ijbiomac.2020.04.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2020] [Revised: 04/01/2020] [Accepted: 04/02/2020] [Indexed: 12/17/2022]
Abstract
Alzheimer's disease is the most common form of neurodegenerative disease and the formation of Aβ amyloid aggregates has been widely demonstrated to be the principal cause of Alzheimer's disease. Our previous study and other studies suggested that the gallate moiety played an obligatory role in the inhibition process of naturally occurring polyphenols on Aβ amyloid fibrils formation. However, the detailed mechanisms were still unknown. Thus, in the present study, the gallic acid (GA) was specially selected and the molecular recognition mechanisms between GA molecules and Aβ1-40 monomer were examined and analyzed by molecular dynamics simulation. The in silico experiments revealed that GA significantly prevented the conformational changes of Aβ1-40 monomer with no β-sheet structure during the whole 100 ns. By analyzing the binding sites of GA molecules to Aβ1-40 monomer, we found that both hydrophilic and hydrophobic amino acid residues were participated in the binding of GA molecules to Aβ1-40 monomer. Moreover, results from the binding free energy analysis further demonstrated that the strength of polar interactions was significantly stronger than that of nonpolar interactions. We believed that our results could help to elucidate the underlying mechanisms of gallate moiety on the anti-amyloidogenic effects of polyphenols at the atomic level.
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Affiliation(s)
- Rong-Zu Nie
- School of Food Science and Technology, School of Chemical Engineering, Hubei University of Arts and Science, Xiangyang 441053, China; Food Ingredients Engineering Technology Research Center of Hubei, China
| | - Yin-Qiang Huo
- School of Food Science and Technology, School of Chemical Engineering, Hubei University of Arts and Science, Xiangyang 441053, China; Food Ingredients Engineering Technology Research Center of Hubei, China
| | - Bo Yu
- School of Food Science and Technology, School of Chemical Engineering, Hubei University of Arts and Science, Xiangyang 441053, China; Food Ingredients Engineering Technology Research Center of Hubei, China
| | - Chuan-Ju Liu
- School of Food Science and Technology, School of Chemical Engineering, Hubei University of Arts and Science, Xiangyang 441053, China; Food Ingredients Engineering Technology Research Center of Hubei, China
| | - Rui Zhou
- School of Food Science and Technology, School of Chemical Engineering, Hubei University of Arts and Science, Xiangyang 441053, China; Food Ingredients Engineering Technology Research Center of Hubei, China
| | - Hong-Hui Bao
- School of Food Science and Technology, School of Chemical Engineering, Hubei University of Arts and Science, Xiangyang 441053, China; Food Ingredients Engineering Technology Research Center of Hubei, China
| | - Shang-Wen Tang
- School of Food Science and Technology, School of Chemical Engineering, Hubei University of Arts and Science, Xiangyang 441053, China; Food Ingredients Engineering Technology Research Center of Hubei, China.
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19
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Pariary R, Ghosh B, Bednarikova Z, Varnava KG, Ratha BN, Raha S, Bhattacharyya D, Gazova Z, Sarojini V, Mandal AK, Bhunia A. Targeted inhibition of amyloidogenesis using a non-toxic, serum stable strategically designed cyclic peptide with therapeutic implications. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2020; 1868:140378. [PMID: 32032759 DOI: 10.1016/j.bbapap.2020.140378] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Revised: 01/24/2020] [Accepted: 01/31/2020] [Indexed: 10/25/2022]
Abstract
Amyloidogenic disorders are currently rising as a global health issue, prompting more and more studies dedicated to the development of effective targeted therapeutics. The innate affinity of these amyloidogenic proteins towards the biomembranes adds further complexities to the systems. Our previous studies have shown that biologically active peptides can effectively target amyloidogenesis serving as an efficient therapeutic alternative in several amyloidogenic disorders. The structural uniqueness of the PWWP motif in the de novo designed heptapeptide, KR7 (KPWWPRR-NH2) was demonstrated to target insulin fiber elongation specifically. By working on insulin, an important model system in amyloidogenic studies, we gained several mechanistic insights into the inhibitory actions at the protein-peptide interface. Here, we report a second-generation non-toxic and serum stable cyclic peptide, based primarily on the PWWP motif that resulted in complete inhibition of insulin fibrillation both in the presence and absence of the model membranes. Using both low- and high-resolution spectroscopic techniques, we could delineate the specific mechanism of inhibition, at atomistic resolution. Our studies put forward an effective therapeutic intervention that redirects the default aggregation kinetics towards off-pathway fibrillation. Based on the promising results, this novel cyclic peptide can be considered an excellent lead to design pharmaceutical molecules against amyloidogenesis.
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Affiliation(s)
- Ranit Pariary
- Department of Biophysics, Bose Institute, P-1/12 CIT Scheme VII (M), Kolkata, 700054, India
| | - Baijayanti Ghosh
- Department of Molecular Medicine, Bose Institute, P-1/12 CIT Scheme VII (M), Kolkata, 700054, India
| | - Zuzana Bednarikova
- Department of Biophysics, Institute of Experimental Physics, Slovak Academy of Sciences, Kosice, Slovakia
| | - Kyriakos Gabriel Varnava
- School of Chemical Sciences, The University of Auckland, Private Bag, 92019, Auckland, New Zealand
| | - Bhisma N Ratha
- Department of Biophysics, Bose Institute, P-1/12 CIT Scheme VII (M), Kolkata, 700054, India
| | - Sreyan Raha
- Department of Physics, Bose Institute, 93/1 APC Road, Kolkata 700009, India
| | - Dipita Bhattacharyya
- Department of Biophysics, Bose Institute, P-1/12 CIT Scheme VII (M), Kolkata, 700054, India
| | - Zuzana Gazova
- Department of Biophysics, Institute of Experimental Physics, Slovak Academy of Sciences, Kosice, Slovakia
| | - Vijayalekshmi Sarojini
- School of Chemical Sciences, The University of Auckland, Private Bag, 92019, Auckland, New Zealand
| | - Atin K Mandal
- Department of Molecular Medicine, Bose Institute, P-1/12 CIT Scheme VII (M), Kolkata, 700054, India
| | - Anirban Bhunia
- Department of Biophysics, Bose Institute, P-1/12 CIT Scheme VII (M), Kolkata, 700054, India.
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20
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De Simone A, Naldi M, Tedesco D, Bartolini M, Davani L, Andrisano V. Advanced analytical methodologies in Alzheimer’s disease drug discovery. J Pharm Biomed Anal 2020; 178:112899. [DOI: 10.1016/j.jpba.2019.112899] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Revised: 09/25/2019] [Accepted: 09/26/2019] [Indexed: 12/13/2022]
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21
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Zhang Z, Wang J, Song Y, Wang Z, Dong M, Liu L. Disassembly of Alzheimer’s amyloid fibrils by functional upconversion nanoparticles under near-infrared light irradiation. Colloids Surf B Biointerfaces 2019; 181:341-348. [DOI: 10.1016/j.colsurfb.2019.05.053] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2019] [Revised: 05/21/2019] [Accepted: 05/22/2019] [Indexed: 10/26/2022]
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22
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Nam G, Ji Y, Lee HJ, Kang J, Yi Y, Kim M, Lin Y, Lee YH, Lim MH. Orobol: An Isoflavone Exhibiting Regulatory Multifunctionality against Four Pathological Features of Alzheimer's Disease. ACS Chem Neurosci 2019; 10:3386-3390. [PMID: 31199606 DOI: 10.1021/acschemneuro.9b00232] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
We report orobol as a multifunctional isoflavone with the ability to (i) modulate the aggregation pathways of both metal-free and metal-bound amyloid-β, (ii) interact with metal ions, (iii) scavenge free radicals, and (iv) inhibit the activity of acetylcholinesterase. Such a framework with multifunctionality could be useful for developing chemical reagents to advance our understanding of multifaceted pathologies of neurodegenerative disorders, including Alzheimer's disease.
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Affiliation(s)
- Geewoo Nam
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
- Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
| | - Yonghwan Ji
- Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
| | - Hyuck Jin Lee
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
- Department of Chemistry Education, Kongju National University, Gongju 32588, Republic of Korea
| | - Juhye Kang
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
- Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
| | - Yelim Yi
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Mingeun Kim
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Yuxi Lin
- Protein Structure Research Group, Korea Basic Science Institute (KBSI), Chungbuk 28119, Republic of Korea
| | - Young-Ho Lee
- Protein Structure Research Group, Korea Basic Science Institute (KBSI), Chungbuk 28119, Republic of Korea
- Bio-Analytical Science, University of Science and Technology (UST), Daejeon 34113, Republic of Korea
| | - Mi Hee Lim
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
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23
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Ginsenoside Re Inhibits ROS/ASK-1 Dependent Mitochondrial Apoptosis Pathway and Activation of Nrf2-Antioxidant Response in Beta-Amyloid-Challenged SH-SY5Y Cells. Molecules 2019; 24:molecules24152687. [PMID: 31344860 PMCID: PMC6696356 DOI: 10.3390/molecules24152687] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Revised: 07/16/2019] [Accepted: 07/18/2019] [Indexed: 12/03/2022] Open
Abstract
Accumulation of amyloid-β (Aβ), which results in the formation of senile plaques that cause oxidative damage and neuronal cell death, has been accepted as the major pathological mechanism of Alzheimer’s disease (AD). Hence, inhibition of Aβ-induced oxidative damage and neuronal cell apoptosis represents the effective strategies in combating AD. Ginsenoside Re (Re) has pharmacological effects against Aβ-induced neurotoxicity. However, its molecular mechanism remains elusive. The present study evaluated the effect of Re against Aβ-induced cytotoxicity and apoptosis in SH-SY5Y cells, and investigated the underlying mechanism. We demonstrate that Re inhibits the Aβ-triggered mitochondrial apoptotic pathway, as indicated by maintenance of mitochondrial functional, elevated Bcl-2/Bax ratio, reduced cytochrome c release, and inactivation of caspase-3/9. Re attenuated Aβ-evoked reactive oxygen species (ROS) production, apoptosis signal-regulating kinase 1 (ASK1) phosphorylation, and JNK activation. ROS-scavenging abrogated the ability of Re to alter ASK-1 activation. Simultaneously, inhibition of JNK abolished Re-induced Bax downregulation in Aβ-challenged SH-SY5Y cells. In addition, Re enhanced activation of the nuclear factor-E2-related factor 2 (Nrf2) in Aβ-induced SH-SY5Y cells. Knockdown of Nrf2 by small interfering RNA targeting Nrf2 abolished the protective effect of Re. Our findings indicate that Re could be a potential therapeutic approach for the treatment of AD.
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24
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Agrawal N, Skelton AA. Structure and Function of Alzheimer’s Amyloid βeta Proteins from Monomer to Fibrils: A Mini Review. Protein J 2019; 38:425-434. [DOI: 10.1007/s10930-019-09854-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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25
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Sun H, Lv F, Liu L, Wang S. Reactive Conjugated Polymers for the Modulation of Islet Amyloid Polypeptide Assembly. ACS APPLIED MATERIALS & INTERFACES 2019; 11:22973-22978. [PMID: 31252497 DOI: 10.1021/acsami.9b05247] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Misfolding and abnormal assembly of proteins cause many intractable diseases. The modulation of the assembly process of these proteins could contribute to understanding and controlling amyloid protein aggregation. Previous works focused mainly on the inhibition of the assembly process. To broaden the interaction modality of modulators with proteins for developing new modulators, in this work, we designed and synthesized two reactive poly ( p-phenylene vinylene) polymers, respectively, functionalized with N-hydroxysuccinimide ester (PPV-NHS) and pentafluorophenol ester (PPV-PFP), which exhibited the prevention or co-assembly effect on the aggregation process of islet amyloid polypeptide (IAPP). Cell assays demonstrated that both of the two polymers could effectively eliminate the cytotoxicity of IAPP. Moreover, PPV-NHS also could irreversibly disrupt preformed IAPP fibrils. We envision that PPV-NHS and PPV-PFP might offer a new design method for the modulation of protein assembly.
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Affiliation(s)
- Han Sun
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry , Chinese Academy of Sciences , Beijing 100910 , P. R. China
- College of Chemistry , University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
| | - Fengting Lv
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry , Chinese Academy of Sciences , Beijing 100910 , P. R. China
- College of Chemistry , University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
| | - Libing Liu
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry , Chinese Academy of Sciences , Beijing 100910 , P. R. China
- College of Chemistry , University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
| | - Shu Wang
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry , Chinese Academy of Sciences , Beijing 100910 , P. R. China
- College of Chemistry , University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
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26
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Specific keratinase derived designer peptides potently inhibit Aβ aggregation resulting in reduced neuronal toxicity and apoptosis. Biochem J 2019; 476:1817-1841. [DOI: 10.1042/bcj20190183] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Revised: 05/22/2019] [Accepted: 05/27/2019] [Indexed: 11/17/2022]
Abstract
Abstract
Compelling evidence implicates self-assembly of amyloid-β (Aβ1–42) peptides into soluble oligomers and fibrils as a major underlying event in Alzheimer's disease (AD) pathogenesis. Herein, we employed amyloid-degrading keratinase (kerA) enzyme as a key Aβ1–42-binding scaffold to identify five keratinase-guided peptides (KgPs) capable of interacting with and altering amyloidogenic conversion of Aβ1–42. The KgPs showed micromolar affinities with Aβ1–42 and abolished its sigmoidal amyloidogenic transition, resulting in abrogation of fibrillogenesis. Comprehensive assessment using dynamic light scattering (DLS), atomic force microscopy (AFM) and Fourier-transform infrared (FTIR) spectroscopy showed that KgPs induced the formation of off-pathway oligomers comparatively larger than the native Aβ1–42 oligomers but with a significantly reduced cross-β signature. These off-pathway oligomers exhibited low immunoreactivity against oligomer-specific (A11) and fibril-specific (OC) antibodies and rescued neuronal cells from Aβ1–42 oligomer toxicity as well as neuronal apoptosis. Structural analysis using molecular docking and molecular dynamics (MD) simulations showed two preferred KgP binding sites (Lys16–Phe20 and Leu28–Val39) on the NMR ensembles of monomeric and fibrillar Aβ1–42, indicating an interruption of crucial hydrophobic and aromatic interactions. Overall, our results demonstrate a new approach for designing potential anti-amyloid molecules that could pave way for developing effective therapeutics against AD and other amyloid diseases.
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27
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Effects of Single Amino Acid Substitutions on Aggregation and Cytotoxicity Properties of Amyloid β Peptide. Int J Pept Res Ther 2019. [DOI: 10.1007/s10989-018-9693-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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28
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Yi Y, Han J, Park MH, Park N, Nam E, Jin HK, Bae JS, Lim MH. Tunable regulatory activities of 1,10-phenanthroline derivatives towards acid sphingomyelinase and Zn(ii)-amyloid-β. Chem Commun (Camb) 2019; 55:5847-5850. [PMID: 31042246 DOI: 10.1039/c9cc01005j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
We report a new series of small molecules able to achieve the tunability of modulatory activities against acid sphingomyelinase (ASM) and Zn(ii)-bound amyloid-β [Zn(ii)-Aβ], two pathological targets found in the brain affected by Alzheimer's disease. Rational tuning of the hydrophobicity and Zn(ii) binding affinity of the 1,10-phenanthroline (phen) framework successfully yielded compounds as chemical modulators for ASM (4 and 5), Zn(ii)-Aβ (phen, 1, and 2), or both (3).
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Affiliation(s)
- Yelim Yi
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea.
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29
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Liu W, Dong X, Sun Y. d-Enantiomeric RTHLVFFARK-NH 2: A Potent Multifunctional Decapeptide Inhibiting Cu 2+-Mediated Amyloid β-Protein Aggregation and Remodeling Cu 2+-Mediated Amyloid β Aggregates. ACS Chem Neurosci 2019; 10:1390-1401. [PMID: 30650306 DOI: 10.1021/acschemneuro.8b00440] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Aggregation of amyloid β-protein (Aβ) into β-sheet-rich plaques is a general feature of Alzheimer's disease (AD). Homeostasis dysregulation of Cu2+ mediates Aβ to form high cytotoxic aggregates, which causes cell damage by generation of reactive oxygen species (ROS). To improve the inhibitory potency and explore the multifaceted functions of our previously designed decapeptide, RTHLVFFARK-NH2 (RK10), we have herein reformulated the decapeptide into its d-enantiomer, rk10, and the effects of chirality on Aβ aggregation, Cu2+-mediated Aβ aggregations, and aggregate-remodeling effects were investigated. The results revealed the following: (1) The d-enantiomer presented enhanced inhibitory potency on Aβ fibrillogenesis in comparison to RK10; rk10 and RK10 increased the cell viability from 60% to 91% and 71%, respectively, at an equimolar concentration to Aβ. (2) The enantiomers were chemically equivalent to Cu2+ chelation, ROS suppression and oxidative damage rescue. (3) The d-enantiomer exhibited higher performance to inhibit Cu2+-mediated Aβ aggregation, and more significantly attenuated the cytotoxicity caused by Aβ42-Cu2+ complex than RK10. Cell viability was rescued from 51% to 89% and 74% by coincubating with rk10 and RK10 at 50 μM, respectively. Intracellular ROS levels generated by Aβ42 and Aβ42-Cu2+ species were also remarkably decreased by treating with rk10. (4) The enantiomers could remodel mature Aβ42-Cu2+ aggregates by Cu2+ chelation, and rk10 showed higher performance than RK10, as evidenced by the enhanced cell viability from 57% to 86% by RK10 and to 96% by rk10. The d-enantiomer also showed higher ability than RK10 on protecting the disrupted species from reaggregation. Taken together, D-chiral derivatization of the decapeptide resulted in a potent multifunctional agent in inhibiting Cu2+-mediated Aβ aggregation and remodeling mature Aβ-Cu2+ species. To the best of our knowledge, this is the first investigation on the chirality effect of a multifunctional peptide inhibitor on Cu2+-mediated Aβ aggregation and on the remodeling effect of mature Aβ-Cu2+ aggregates. The work provides new insights into the critical role of chirality in the multifaceted functions of peptide inhibitors against amyloid formation and its toxicity.
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Affiliation(s)
- Wei Liu
- Department of Biochemical Engineering and Key Laboratory of Systems Bioengineering of the Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300354, China
| | - Xiaoyan 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 300354, China
| | - 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 300354, China
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30
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Siposova K, Kozar T, Huntosova V, Tomkova S, Musatov A. Inhibition of amyloid fibril formation and disassembly of pre-formed fibrils by natural polyphenol rottlerin. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2019; 1867:259-274. [DOI: 10.1016/j.bbapap.2018.10.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2018] [Revised: 09/18/2018] [Accepted: 10/08/2018] [Indexed: 12/15/2022]
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31
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An Aβ42 variant that inhibits intra- and extracellular amyloid aggregation and enhances cell viability. Biochem J 2018; 475:3087-3103. [DOI: 10.1042/bcj20180247] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Revised: 09/02/2018] [Accepted: 09/07/2018] [Indexed: 01/06/2023]
Abstract
Aggregation and accumulation of the 42-residue amyloid β peptide (Aβ42) in the extracellular matrix and within neuronal cells is considered a major cause of neuronal cell cytotoxicity and death in Alzheimer's disease (AD) patients. Therefore, molecules that bind to Aβ42 and prevent its aggregation are therapeutically promising as AD treatment. Here, we show that a non-self-aggregating Aβ42 variant carrying two surface mutations, F19S and L34P (Aβ42DM), inhibits wild-type Aβ42 aggregation and significantly reduces Aβ42-mediated cell cytotoxicity. In addition, Aβ42DM inhibits the uptake and internalization of extracellularly added pre-formed Aβ42 aggregates into cells. This was the case in both neuronal and non-neuronal cells co-expressing Aβ42 and Aβ42DM or following pre-treatment of cells with extracellular soluble forms of the two peptides, even at high Aβ42 to Aβ42DM molar ratios. In cells, Aβ42DM associates with Aβ42, while in vitro, the two soluble recombinant peptides exhibit nano-molar binding affinity. Importantly, Aβ42DM potently suppresses Aβ42 amyloid aggregation in vitro, as demonstrated by thioflavin T fluorescence and transmission electron microscopy for detecting amyloid fibrils. Overall, we present a new approach for inhibiting Aβ42 fibril formation both within and outside cells. Accordingly, Aβ42DM should be evaluated in vivo for potential use as a therapeutic lead for treating AD.
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Malishev R, Arad E, Bhunia SK, Shaham-Niv S, Kolusheva S, Gazit E, Jelinek R. Chiral modulation of amyloid beta fibrillation and cytotoxicity by enantiomeric carbon dots. Chem Commun (Camb) 2018; 54:7762-7765. [PMID: 29947369 DOI: 10.1039/c8cc03235a] [Citation(s) in RCA: 75] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Enantiomeric carbon dots (C-dots) synthesized from l-lysine or d-lysine, modulate aggregation and cytotoxicity of amyloid beta-42 (Aβ42), the primary constituent of the amyloid plaques associated with Alzheimer's disease. In particular, l-Lys-C-dots dramatically remodeled Aβ42 secondary structure and fibril morphologies, as well as inhibited Aβ42 cytotoxicity and membrane interactions.
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Affiliation(s)
- Ravit Malishev
- Department of Chemistry, Ben Gurion University of the Negev, Beer Sheva 84105, Israel.
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Ryan P, Patel B, Makwana V, Jadhav HR, Kiefel M, Davey A, Reekie TA, Rudrawar S, Kassiou M. Peptides, Peptidomimetics, and Carbohydrate-Peptide Conjugates as Amyloidogenic Aggregation Inhibitors for Alzheimer's Disease. ACS Chem Neurosci 2018; 9:1530-1551. [PMID: 29782794 DOI: 10.1021/acschemneuro.8b00185] [Citation(s) in RCA: 61] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Alzheimer's disease (AD) is a progressive neurodegenerative disorder accounting for 60-80% of dementia cases. For many years, AD causality was attributed to amyloid-β (Aβ) aggregated species. Recently, multiple therapies that target Aβ aggregation have failed in clinical trials, since Aβ aggregation is found in AD and healthy patients. Attention has therefore shifted toward the aggregation of the tau protein as a major driver of AD. Numerous inhibitors of tau-based pathology have recently been developed. Diagnosis of AD has shifted from measuring late stage senile plaques to early stage biomarkers, amyloid-β and tau monomers and oligomeric assemblies. Synthetic peptides and some derivative structures are being explored for use as theranostic tools as they possess the capacity both to bind the biomarkers and to inhibit their pathological self-assembly. Several studies have demonstrated that O-linked glycoside addition can significantly alter amyloid aggregation kinetics. Furthermore, natural O-glycosylation of amyloid-forming proteins, including amyloid precursor protein (APP), tau, and α-synuclein, promotes alternative nonamyloidogenic processing pathways. As such, glycopeptides and related peptidomimetics are being investigated within the AD field. Here we review advancements made in the last 5 years, as well as the arrival of sugar-based derivatives.
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Affiliation(s)
- Philip Ryan
- School of Pharmacy and Pharmacology, Griffith University, Gold Coast 4222, Australia
| | - Bhautikkumar Patel
- School of Pharmacy and Pharmacology, Griffith University, Gold Coast 4222, Australia
| | - Vivek Makwana
- School of Pharmacy and Pharmacology, Griffith University, Gold Coast 4222, Australia
| | - Hemant R. Jadhav
- Department of Pharmacy, Birla Institute of Technology and Science, Pilani Campus, Pilani-333031, Rajasthan, India
| | - Milton Kiefel
- Institute for Glycomics, Griffith University, Gold Coast 4222, Australia
| | - Andrew Davey
- School of Pharmacy and Pharmacology, Griffith University, Gold Coast 4222, Australia
- Menzies Health Institute Queensland, Griffith University, Gold Coast 4222, Australia
- Quality Use of Medicines Network, Griffith University, Gold Coast 4222, Australia
| | | | - Santosh Rudrawar
- School of Pharmacy and Pharmacology, Griffith University, Gold Coast 4222, Australia
- Menzies Health Institute Queensland, Griffith University, Gold Coast 4222, Australia
- Quality Use of Medicines Network, Griffith University, Gold Coast 4222, Australia
- School of Chemistry, The University of Sydney, NSW 2006, Australia
| | - Michael Kassiou
- School of Chemistry, The University of Sydney, NSW 2006, Australia
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Aβ 1-40 mediated aggregation of proteins and metabolites unveils the relevance of amyloid cross-seeding in amyloidogenesis. Biochem Biophys Res Commun 2018; 501:158-164. [DOI: 10.1016/j.bbrc.2018.04.198] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Accepted: 04/25/2018] [Indexed: 12/14/2022]
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Liu Y, Xu LP, Wang Q, Yang B, Zhang X. Synergistic Inhibitory Effect of GQDs-Tramiprosate Covalent Binding on Amyloid Aggregation. ACS Chem Neurosci 2018; 9:817-823. [PMID: 29244487 DOI: 10.1021/acschemneuro.7b00439] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Inhibiting the amyloid aggregation is considered to be an effective strategy to explore possible treatment of amyloid-related diseases including Alzheimer's disease, Parkinson's disease, and type II diabetes. Herein, a new high-efficiency and low-cytotoxicity Aβ aggregation inhibitors, GQD-T, was designed through the combination of two Aβ aggregation inhibitors, graphene quantum dots (GQDs) and tramiprosate. GQD-T showed the capability of efficiently inhibiting the aggregation of Aβ peptides and rescuing Aβ-induced cytotoxicity due to the synergistic effect of the GQDs and tramiprosate. In addition, the GQD-T has the characteristics of low toxicity and great biocompatibility. It is believed that GQD-T may be a potential candidate for an Alzheimer's drug and this work provides a new strategy for exploring Aβ peptide aggregation inhibitors.
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Affiliation(s)
- Yibiao Liu
- Institute of Nanostructured Functional Materials, Huanghe Science & Technology College, Zhengzhou 450006, P.R. China
- Henan Provincial Key Laboratory of Nano-composite Materials and Applications, Huanghe Science & Technology College, Zhengzhou 450006, P.R. China
| | - Li-Ping Xu
- Research Center for Bioengineering and Sensing Technology, University of Science & Technology Beijing, Beijing 100083, P.R. China
| | - Qiang Wang
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, The Chinese Academy of Sciences, Taiyuan 030001, P.R. China
| | - Baocheng Yang
- Institute of Nanostructured Functional Materials, Huanghe Science & Technology College, Zhengzhou 450006, P.R. China
- Henan Provincial Key Laboratory of Nano-composite Materials and Applications, Huanghe Science & Technology College, Zhengzhou 450006, P.R. China
| | - Xueji Zhang
- Research Center for Bioengineering and Sensing Technology, University of Science & Technology Beijing, Beijing 100083, P.R. China
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Ramesh NK, Sudhakar S, Mani E. Modeling of the Inhibitory Effect of Nanoparticles on Amyloid β Fibrillation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:4004-4012. [PMID: 29553751 DOI: 10.1021/acs.langmuir.8b00388] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Experiments have shown that charged nanoparticles (NP) inhibit, partially or completely, the aggregation of Aβ protein monomers into fibrils. The equilibrium fibril content is found to be inversely proportional to the concentration of NP. In this work, we report a kinetic model for the fibrillation of Aβ protein in the presence of NP. In the model, apart from nucleation, elongation and fragmentation processes, the effect of NP is considered to cause a conformational change to the protein monomer, making the latter incompatible for aggregation. The simulated results explain the growth kinetics of pure Aβ (1-40) protein, and the kinetics in the presence of NP. The NP-monomer interaction considered in the model captures the significant effect of NP on the fibrillation process at a very molar ratio (NP to Aβ monomer) as low as 10-4. The model predictions are compared with two different NP systems, namely, gold and silica NP. The model can be applied to explain the inhibitory effect of other additives such as small molecules, NP, lipids, and surfactants that show a similar inhibition trend for fibril formation of Aβ and other proteins.
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Affiliation(s)
- Nirmal Kumar Ramesh
- Polymer Engineering and Colloids Science Laboratory, Department of Chemical Engineering , Indian Institute of Technology Madras , Chennai - 600036 , India
| | - Swathi Sudhakar
- Polymer Engineering and Colloids Science Laboratory, Department of Chemical Engineering , Indian Institute of Technology Madras , Chennai - 600036 , India
| | - Ethayaraja Mani
- Polymer Engineering and Colloids Science Laboratory, Department of Chemical Engineering , Indian Institute of Technology Madras , Chennai - 600036 , India
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Lee YH, Ramamoorthy A. Semen-derived amyloidogenic peptides-Key players of HIV infection. Protein Sci 2018; 27:1151-1165. [PMID: 29493036 DOI: 10.1002/pro.3395] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2018] [Revised: 02/23/2018] [Accepted: 02/26/2018] [Indexed: 12/26/2022]
Abstract
Misfolding and amyloid aggregation of intrinsically disordered proteins (IDPs) are implicated in a variety of diseases. Studies have shown that membrane plays important roles on the formation of intermediate structures of IDPs that can initiate (and/or speed-up) amyloid aggregation to form fibers. The process of amyloid aggregation also disrupts membrane to cause cell death in amyloid diseases like Alzheimer's disease and type-2 diabetes. On the other hand, recent studies reported the membrane fusion properties of amyloid fibers. Remarkably, amyloid-fibril formation by short peptide fragments of highly abundant prostatic acidic-phosphatase (PAP) in human semen and are capable of boosting the rate of HIV infection up to 400,000-fold during sexual contact. Unlike the least toxic fully matured fibers of most amyloid proteins, the semen-derived enhancer of virus infection (SEVI) amyloid-fibrils of PAP peptide fragments are highly potent in rendering the maximum rate of HIV infection. This unusual property of amyloid fibers has witnessed increasing number of studies on the biophysical aspects of fiber formation and fiber-membrane interactions. NMR studies have reported a highly disordered partial helical structure in a membrane environment for the intrinsically disordered PAP peptide that promotes the fusion of the viral membrane with that of host cells. The purpose of this review article is to unify and integrate biophysical and immunological research reported in the previous studies on SEVI. Specifically, amyloid aggregation, dramatic HIV infection enhancing properties, membrane fusion properties, high resolution NMR structure, and approaches to eliminate the enhancement of HIV infection of SEVI peptides are discussed.
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Affiliation(s)
- Young-Ho Lee
- Institute for Protein Research, Osaka University, Yamadaoka 3-2, Suita, Osaka, 565-0871, Japan
| | - Ayyalusamy Ramamoorthy
- Biophysics Program and Department of Chemistry, The University of Michigan, Ann Arbor, Michigan, 48109-1055
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Baig MH, Ahmad K, Rabbani G, Choi I. Use of Peptides for the Management of Alzheimer's Disease: Diagnosis and Inhibition. Front Aging Neurosci 2018; 10:21. [PMID: 29467644 PMCID: PMC5808296 DOI: 10.3389/fnagi.2018.00021] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Accepted: 01/18/2018] [Indexed: 11/13/2022] Open
Abstract
Alzheimer's disease (AD) is a form of dementia and the most common progressive neurodegenerative disease (ND). The targeting of amyloid-beta (Aβ) aggregation is one of the most widely used strategies to manage AD, and efforts are being made globally to develop peptide-based compounds for the early diagnosis and treatment of AD. Here, we briefly discuss the use of peptide-based compounds for the early diagnosis and treatment of AD and the use of peptide-based inhibitors targeting various Aβ aggregation checkpoints. In addition, we briefly discuss recent applications of peptide-based inhibitors against various AD targets including amyloid beta, β-site amyloid precursor protein cleaving enzyme 1 (BACE1), Glyceraldehyde-3-phosphate dehydrogenase (GAPDH), tyrosine phosphatase (TP) and potassium channel KV1.3.
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Affiliation(s)
- Mohammad H Baig
- Department of Medical Biotechnology, Yeungnam University, Gyeongsan, South Korea
| | - Khurshid Ahmad
- Department of Medical Biotechnology, Yeungnam University, Gyeongsan, South Korea
| | - Gulam Rabbani
- Department of Medical Biotechnology, Yeungnam University, Gyeongsan, South Korea
| | - Inho Choi
- Department of Medical Biotechnology, Yeungnam University, Gyeongsan, South Korea
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Son G, Lee BI, Chung YJ, Park CB. Light-triggered dissociation of self-assembled β-amyloid aggregates into small, nontoxic fragments by ruthenium (II) complex. Acta Biomater 2018; 67:147-155. [PMID: 29221856 DOI: 10.1016/j.actbio.2017.11.048] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2017] [Revised: 11/16/2017] [Accepted: 11/28/2017] [Indexed: 10/18/2022]
Abstract
The self-assembly of β-amyloid (Aβ) peptides into highly stable plaques is a major hallmark of Alzheimer's disease. Here, we report visible light-driven dissociation of β-sheet-rich Aβ aggregates into small, nontoxic fragments using ruthenium (II) complex {[Ru(bpy)3]2+} that functions as a highly sensitive, biocompatible, photoresponsive anti-Aβ agent. According to our multiple analyses using thioflavin T, bicinchoninic acid, dynamic light scattering, atomic force microscopy, circular dichroism, and Fourier transform infrared spectroscopy, [Ru(bpy)3]2+ successfully disassembled Aβ aggregates by destabilizing the β-sheet secondary structure under illumination of white light-emitting diode light. We validated that photoexcited [Ru(bpy)3]2+ causes oxidative damages of Aβ peptides, resulting in the dissociation of Aβ aggregates. The efficacy of [Ru(bpy)3]2+ is attributed to reactive oxygen species, such as singlet oxygen, generated from [Ru(bpy)3]2+ that absorbed photon energy in the visible range. Furthermore, photoexcited [Ru(bpy)3]2+ strongly inhibited the self-assembly of Aβ monomers even at concentrations as low as 1 nM and reduced the cytotoxicity of Aβ aggregates. STATEMENT OF SIGNIFICANCE Alzheimer's disease is the most common progressive neurodegenerative disease, affecting more than 13% of the population over age 65. Over the last decades, researchers have focused on understanding the mechanism of amyloid formation, the hallmark of various amyloid diseases including Alzheimer's and Parkinson's. In this paper, we successfully demonstrate the dissociation of β-Amyloid (Aβ) aggregates into small, less-amyloidic fragments by photoexcited [Ru(bpy)3]2+ through destabilization of β-sheet secondary structure. We validated the light-triggered dissociation of amyloid structure using multiple analytical tools. Furthermore, we confirmed that photoexcited [Ru(bpy)3]2+ reduces cytotoxicity of Aβ aggregates. Our work should open a new horizon in the study of Alzheimer's amyloid aggregation by showing the potential of photoexcited dye molecules as an alternative therapeutic strategy for treating Alzheimer's disease in future.
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Mechanistic insights into remodeled Tau-derived PHF6 peptide fibrils by Naphthoquinone-Tryptophan hybrids. Sci Rep 2018; 8:71. [PMID: 29311706 PMCID: PMC5758761 DOI: 10.1038/s41598-017-18443-2] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Accepted: 12/12/2017] [Indexed: 11/20/2022] Open
Abstract
Intra-cellular tau protein tangles and extra-cellular β-amyloid plaques are hallmarks of Alzheimer’s disease (AD), characterized by the conversion of natively unfolded monomeric protein/peptide into misfolded β-sheet rich aggregates. Therefore, inhibiting the aggregation cascade or disassembling the pre-formed aggregates becomes a pivotal event in disease treatment. In the present study, we show that Naphthoquinone-Tryptophan hybrids, i.e., NQTrp and Cl-NQTrp significantly disrupted the pre-formed fibrillar aggregates of Tau-derived PHF6 (VQIVYK) peptide and full-length tau protein in vitro, in a dose-dependent manner as evident from ThS assay, CD spectroscopy, and TEM. Molecular dynamics simulation of PHF6 oligomers and fibrils with the Naphthoquinone-Tryptophan hybrids provides a possible structure-function based mechanism-of-action, highlighting the role of hydrophobic interaction and hydrogen bond formation during fibril disassembly. These findings signify the effectiveness of NQTrp and Cl-NQTrp in disassembling fibrillar aggregates and may help in designing novel hybrid molecules for AD treatment.
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41
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Ahmed R, Melacini G. A solution NMR toolset to probe the molecular mechanisms of amyloid inhibitors. Chem Commun (Camb) 2018; 54:4644-4652. [DOI: 10.1039/c8cc01380b] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A chemical exchange-based solution NMR toolset to probe the molecular mechanisms of amyloid inhibitors.
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Affiliation(s)
- Rashik Ahmed
- Department of Biochemistry and Biomedical Sciences
- McMaster University
- Hamilton
- Canada
| | - Giuseppe Melacini
- Department of Biochemistry and Biomedical Sciences
- McMaster University
- Hamilton
- Canada
- Department of Chemistry and Chemical Biology
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42
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Sciacca MFM, Romanucci V, Zarrelli A, Monaco I, Lolicato F, Spinella N, Galati C, Grasso G, D’Urso L, Romeo M, Diomede L, Salmona M, Bongiorno C, Di Fabio G, La Rosa C, Milardi D. Inhibition of Aβ Amyloid Growth and Toxicity by Silybins: The Crucial Role of Stereochemistry. ACS Chem Neurosci 2017; 8:1767-1778. [PMID: 28562008 DOI: 10.1021/acschemneuro.7b00110] [Citation(s) in RCA: 67] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
The self-assembling of the amyloid β (Aβ) peptide into neurotoxic aggregates is considered a central event in the pathogenesis of Alzheimer's disease (AD). Based on the "amyloid hypothesis", many efforts have been devoted to designing molecules able to halt disease progression by inhibiting Aβ self-assembly. Here, we combine biophysical (ThT assays, TEM and AFM imaging), biochemical (WB and ESI-MS), and computational (all-atom molecular dynamics) techniques to investigate the capacity of four optically pure components of the natural product silymarin (silybin A, silybin B, 2,3-dehydrosilybin A, 2,3-dehydrosilybin B) to inhibit Aβ aggregation. Despite TEM analysis demonstrated that all the four investigated flavonoids prevent the formation of mature fibrils, ThT assays, WB and AFM investigations showed that only silybin B was able to halt the growth of small-sized protofibrils thus promoting the formation of large, amorphous aggregates. Molecular dynamics (MD) simulations indicated that silybin B interacts mainly with the C-terminal hydrophobic segment 35MVGGVV40 of Aβ40. Consequently to silybin B binding, the peptide conformation remains predominantly unstructured along all the simulations. By contrast, silybin A interacts preferentially with the segments 17LVFF20 and 27NKGAII32 of Aβ40 which shows a high tendency to form bend, turn, and β-sheet conformation in and around these two domains. Both 2,3-dehydrosilybin enantiomers bind preferentially the segment 17LVFF20 but lead to the formation of different small-sized, ThT-positive Aβ aggregates. Finally, in vivo studies in a transgenic Caenorhabditis elegans strain expressing human Aβ indicated that silybin B is the most effective of the four compounds in counteracting Aβ proteotoxicity. This study underscores the pivotal role of stereochemistry in determining the neuroprotective potential of silybins and points to silybin B as a promising lead compound for further development in anti-AD therapeutics.
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Affiliation(s)
- Michele. F. M. Sciacca
- Institute of Biostructures and
Bioimages—Catania, National Research Council, Via Paolo Gaifami 8, 95126 Catania, Italy
| | - Valeria Romanucci
- Department of Chemical Sciences, University of Napoli “Federico II”, Via Cintia 4, I-80126 Napoli, Italy
| | - Armando Zarrelli
- Department of Chemical Sciences, University of Napoli “Federico II”, Via Cintia 4, I-80126 Napoli, Italy
| | - Irene Monaco
- Institute of Biostructures and
Bioimages—Catania, National Research Council, Via Paolo Gaifami 8, 95126 Catania, Italy
| | - Fabio Lolicato
- Department of Physics, University of Helsinki, P.O. Box 64, FI-00014 Helsinki, Finland
- Department of Physics, Tampere University of Technology, P.O.
Box 692, FI-33101 Tampere, Finland
| | | | - Clelia Galati
- STMicroelectronics, Stradale Primosole 50, 95121 Catania, Italy
| | - Giuseppe Grasso
- Dipartimento di Scienze
Chimiche, Università degli Studi di Catania, Viale Andrea
Doria 6, 95125 Catania, Italy
| | - Luisa D’Urso
- Dipartimento di Scienze
Chimiche, Università degli Studi di Catania, Viale Andrea
Doria 6, 95125 Catania, Italy
| | - Margherita Romeo
- IRCCS-Istituto di Ricerche Farmacologiche “Mario Negri”, Via Giuseppe La Masa 19, 20156, Milano, Italy
| | - Luisa Diomede
- IRCCS-Istituto di Ricerche Farmacologiche “Mario Negri”, Via Giuseppe La Masa 19, 20156, Milano, Italy
| | - Mario Salmona
- IRCCS-Istituto di Ricerche Farmacologiche “Mario Negri”, Via Giuseppe La Masa 19, 20156, Milano, Italy
| | - Corrado Bongiorno
- Institute for Microelectronics
and Microsystems, National Research Council, Stradale Primosole 50, 95121 Catania, Italy
| | - Giovanni Di Fabio
- Department of Chemical Sciences, University of Napoli “Federico II”, Via Cintia 4, I-80126 Napoli, Italy
| | - Carmelo La Rosa
- Dipartimento di Scienze
Chimiche, Università degli Studi di Catania, Viale Andrea
Doria 6, 95125 Catania, Italy
| | - Danilo Milardi
- Institute of Biostructures and
Bioimages—Catania, National Research Council, Via Paolo Gaifami 8, 95126 Catania, Italy
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Vitamin B12 offers neuronal cell protection by inhibiting Aβ-42 amyloid fibrillation. Int J Biol Macromol 2017; 99:477-482. [DOI: 10.1016/j.ijbiomac.2017.03.001] [Citation(s) in RCA: 87] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2017] [Revised: 02/28/2017] [Accepted: 03/01/2017] [Indexed: 01/23/2023]
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