1
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Garcha J, Huang J, Martinez Pomier K, Melacini G. Amyloid-Driven Allostery. Biophys Chem 2024; 315:107320. [PMID: 39278064 DOI: 10.1016/j.bpc.2024.107320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2024] [Revised: 08/28/2024] [Accepted: 08/29/2024] [Indexed: 09/17/2024]
Abstract
The fields of allostery and amyloid-related pathologies, such as Parkinson's disease (PD), have been extensively explored individually, but less is known about how amyloids control allostery. Recent advancements have revealed that amyloids can drive allosteric effects in both intrinsically disordered proteins, such as alpha-synuclein (αS), and multi-domain signaling proteins, such as protein kinase A (PKA). Amyloid-driven allostery plays a central role in explaining the mechanisms of gain-of-pathological-function mutations in αS (e.g. E46K, which causes early PD onset) and loss-of-physiological-function mutations in PKA (e.g. A211D, which predisposes to tumors). This review highlights allosteric effects of disease-related mutations and how they can cause exposure of amyloidogenic regions, leading to amyloids that are either toxic or cause aberrant signaling. We also discuss multiple potential modulators of these allosteric effects, such as MgATP and kinase substrates, opening future opportunities to improve current pharmacological interventions against αS and PKA-related pathologies. Overall, we show that amyloid-driven allosteric models are useful to explain the mechanisms underlying disease-related mutations.
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Affiliation(s)
- Jaskiran Garcha
- Department of Chemistry and Chemical Biology, McMaster University, Hamilton, Ontario L8S 4L8, Canada
| | - Jinfeng Huang
- Department of Chemistry and Chemical Biology, McMaster University, Hamilton, Ontario L8S 4L8, Canada
| | - Karla Martinez Pomier
- Department of Chemistry and Chemical Biology, McMaster University, Hamilton, Ontario L8S 4L8, Canada
| | - Giuseppe Melacini
- Department of Chemistry and Chemical Biology, McMaster University, Hamilton, Ontario L8S 4L8, Canada; Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario L8S 4L8, Canada.
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2
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Gonçalves PB, Cordeiro Y, Rennó Sodero AC. Understanding the mechanisms of green tea EGCG against amyloid β oligomer neurotoxicity through computational studies. RSC Adv 2024; 14:22525-22539. [PMID: 39015669 PMCID: PMC11251396 DOI: 10.1039/d4ra03343d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2024] [Accepted: 07/04/2024] [Indexed: 07/18/2024] Open
Abstract
Oligomeric species of amyloid β peptide (Aβ) are pivotal in Alzheimer's disease (AD) pathogenesis, making them valuable therapeutic targets. Currently, there is no cure or preventive therapy available for AD, with only a few therapeutics offering temporary alleviation of symptoms. Natural products (NPs) are now considered promising anti-amyloid agents. Green tea catechins have garnered considerable attention due to their ability to remodel the toxic amyloid β peptide oligomers (AβOs) into non-toxic assemblies. Nevertheless, the precise molecular mechanism underlying their effects on AβOs remains unclear. In this study, we employ a combination of binding site prediction, molecular docking, and dynamics simulations to gain mechanistic insights into the binding of the potent anti-amyloid epigallocatechin-3-gallate (EGCG) and the less effective catechin, epicatechin (EC), on the structure of pore-forming Aβ tetramers (PDB ID 6RHY). This recently elucidated structure represents AβO(1-42) with two faces of the hydrophobic β-sheet core and hydrophilic edges. Our simulations revealed three potential druggable binding sites within the AβO: two in hydrophilic edges and one in the β-sheet core. Although both catechins bind via hydrogen bond (H-bond) and aromatic interactions to the three potential binding sites, EGCG interacted with key residues more efficiently than EC. We propose that EGCG may remodel AβOs preventing pore formation by binding to the hydrophilic edge binding sites. Additionally, EGCG interacts with key residues in the oligomer's β-sheet core binding site, crucial for fibrillar aggregation. A better understanding of how anti-amyloid compounds remodelling AβOs could be valuable for the development of new therapeutic strategies targeting Aβ in AD. Further experimental validation using point mutations involving key residues could be useful to define whether the establishment of these interactions is crucial for the EGCG remodelling effect.
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Affiliation(s)
- Priscila Baltazar Gonçalves
- Faculdade de Farmácia, Programa de Pós-Graduação em Ciências Farmacêuticas, Universidade Federal do Rio de Janeiro RJ 21941-902 Brazil
| | - Yraima Cordeiro
- Faculdade de Farmácia, Programa de Pós-Graduação em Ciências Farmacêuticas, Universidade Federal do Rio de Janeiro RJ 21941-902 Brazil
| | - Ana Carolina Rennó Sodero
- Faculdade de Farmácia, Programa de Pós-Graduação em Ciências Farmacêuticas, Universidade Federal do Rio de Janeiro RJ 21941-902 Brazil
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3
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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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4
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Sciandrone B, Palmioli A, Ciaramelli C, Pensotti R, Colombo L, Regonesi ME, Airoldi C. Cell-Free and In Vivo Characterization of the Inhibitory Activity of Lavado Cocoa Flavanols on the Amyloid Protein Ataxin-3: Toward New Approaches against Spinocerebellar Ataxia Type 3. ACS Chem Neurosci 2024; 15:278-289. [PMID: 38154144 PMCID: PMC10797631 DOI: 10.1021/acschemneuro.3c00560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Revised: 12/12/2023] [Accepted: 12/13/2023] [Indexed: 12/30/2023] Open
Abstract
Spinocerebellar ataxia type 3 (SCA3) is a neurodegenerative disorder characterized by ataxia and other neurological manifestations, with a poor prognosis and a lack of effective therapies. The amyloid aggregation of the ataxin-3 protein is a hallmark of SCA3 and one of the main biochemical events prompting its onset, making it a prominent target for the development of preventive and therapeutic interventions. Here, we tested the efficacy of an aqueous Lavado cocoa extract and its polyphenolic components against ataxin-3 aggregation and neurotoxicity. The combination of biochemical assays and atomic force microscopy morphological analysis provided clear evidence of cocoa flavanols' ability to hinder ATX3 amyloid aggregation through direct physical interaction, as assessed by NMR spectroscopy. The chemical identity of the flavanols was investigated by ultraperformance liquid chromatography-high-resolution mass spectrometry. The use of the preclinical model Caenorhabditis elegans allowed us to demonstrate cocoa flavanols' ability to ameliorate ataxic phenotypes in vivo. To the best of our knowledge, Lavado cocoa is the first natural source whose extract is able to directly interfere with ATX3 aggregation, leading to the formation of off-pathway species.
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Affiliation(s)
- Barbara Sciandrone
- Department
of Biotechnology and Biosciences, University
of Milano-Bicocca, P.zza Della Scienza 2, 20126 Milan, Italy
| | - Alessandro Palmioli
- Department
of Biotechnology and Biosciences, University
of Milano-Bicocca, P.zza Della Scienza 2, 20126 Milan, Italy
- NeuroMI,
Milan Center for Neuroscience, University
of Milano-Bicocca, 20126 Milano, Italy
| | - Carlotta Ciaramelli
- Department
of Biotechnology and Biosciences, University
of Milano-Bicocca, P.zza Della Scienza 2, 20126 Milan, Italy
- NeuroMI,
Milan Center for Neuroscience, University
of Milano-Bicocca, 20126 Milano, Italy
| | - Roberta Pensotti
- Department
of Biotechnology and Biosciences, University
of Milano-Bicocca, P.zza Della Scienza 2, 20126 Milan, Italy
| | - Laura Colombo
- Department
of Molecular Biochemistry and Pharmacology, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Via M. Negri 2, 20156 Milano, Italy
| | - Maria Elena Regonesi
- Department
of Biotechnology and Biosciences, University
of Milano-Bicocca, P.zza Della Scienza 2, 20126 Milan, Italy
- NeuroMI,
Milan Center for Neuroscience, University
of Milano-Bicocca, 20126 Milano, Italy
| | - Cristina Airoldi
- Department
of Biotechnology and Biosciences, University
of Milano-Bicocca, P.zza Della Scienza 2, 20126 Milan, Italy
- NeuroMI,
Milan Center for Neuroscience, University
of Milano-Bicocca, 20126 Milano, Italy
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5
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Huo Y, Zhao C, Wang Y, Wang S, Mu T, Du W. Roles of Apigenin and Nepetin in the Assembly Behavior and Cytotoxicity of Prion Neuropeptide PrP106-126. ACS Chem Neurosci 2024; 15:245-257. [PMID: 38133816 DOI: 10.1021/acschemneuro.3c00417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2023] Open
Abstract
Development of potential inhibitors to prevent prion protein (PrP) fibrillation is a therapeutic strategy for prion diseases. The prion neuropeptide PrP106-126, a research model of abnormal PrP (PrPSc), presents similar physicochemical and biochemical characters to PrPSc, which is also a target of potential inhibitors against prion deposition. Many flavones have antioxidant, anti-inflammatory, and antibacterial properties, and they are applied in treating prion disorder and other amyloidosis as well. However, the inhibition mechanism of flavones on PrP106-126 fibrillation is still unclear. In the current work, apigenin and nepetin were used to suppress the aggregation of PrP106-126 and to alleviate the peptide-induced cytotoxicity. The results showed that apigenin and nepetin impeded the fibril formation of PrP106-126 and depolymerized the preformed fibrils. They were bound to PrP106-126 predominantly by hydrophobic and hydrogen bonding interactions. In addition, both flavones upregulated cell viability and decreased membrane leakage through reducing peptide oligomerization. The differences in inhibition and cell protection between the two small molecules were presumably attributed to the substitution of hydroxyl and methoxy groups in nepetin, which demonstrated the significant structure-function relationship of flavones with prion neuropeptide and the prospect of flavonoids as drug candidates against prion diseases.
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Affiliation(s)
- Yan Huo
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Cong Zhao
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Yanan Wang
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Shao Wang
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Tiancheng Mu
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Weihong Du
- Department of Chemistry, Renmin University of China, Beijing 100872, China
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6
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Huo Y, Huang X, Wang Y, Zhao C, Zheng T, Du W. Inhibitory effects of sesquiterpene lactones on the aggregation and cytotoxicity of prion neuropeptide. Biochimie 2023; 211:131-140. [PMID: 36963557 DOI: 10.1016/j.biochi.2023.03.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Revised: 03/12/2023] [Accepted: 03/21/2023] [Indexed: 03/26/2023]
Abstract
The misfolding and conformational transformation of prion protein (PrP) are crucial to the progression of prion diseases. Screening for available natural inhibitors against prion proteins can contribute to the rational design and development of new anti-prion drugs and therapeutic strategies. The prion neuropeptide, PrP106-126 is commonly used as a model peptide of the abnormal PrPSc, and a number of potential inhibitors were explored against the amyloid fibril formation of PrP106-126. The well-known sesquiterpene lactone, artemisinin, shows diverse biological functions in anti-malarial, anti-cancer and lowering glucose. However, its inhibitory effect on PrP106-126 fibrillation is unclear. In this work, we selected two sesquiterpene lactones, artemisinin (1) and artesunate (2), to explore their roles in PrP106-126 aggregation by a series of physicochemical and biochemical methods. The results demonstrated that 1 and 2 could effectively impede the formation of amyloid fibrils and remodel the preformed fibrils. The binding of the small molecules to PrP106-126 was dominated by electrostatic, hydrophobic and hydrogen bonding interactions. In addition, both compounds exhibited neuroprotective effects by reducing peptide oligomerization. 2 showed better inhibition and regulation on peptide aggregation and cellular viability than 1 due to its specific succinate modification. Our study provides the information of sesquiterpene lactones to prevent PrP fibril formation and other related amyloidosis.
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Affiliation(s)
- Yan Huo
- Department of Chemistry, Renmin University of China, Beijing, 100872, China
| | - Xiangyi Huang
- Department of Chemistry, Renmin University of China, Beijing, 100872, China
| | - Yanan Wang
- Department of Chemistry, Renmin University of China, Beijing, 100872, China
| | - Cong Zhao
- Department of Chemistry, Renmin University of China, Beijing, 100872, China
| | - Ting Zheng
- Department of Chemistry, Renmin University of China, Beijing, 100872, China
| | - Weihong Du
- Department of Chemistry, Renmin University of China, Beijing, 100872, China.
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7
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Palmioli A, Mazzoni V, De Luigi A, Bruzzone C, Sala G, Colombo L, Bazzini C, Zoia CP, Inserra M, Salmona M, De Noni I, Ferrarese C, Diomede L, Airoldi C. Alzheimer's Disease Prevention through Natural Compounds: Cell-Free , In Vitro, and In Vivo Dissection of Hop ( Humulus lupulus L.) Multitarget Activity. ACS Chem Neurosci 2022; 13:3152-3167. [PMID: 36283035 PMCID: PMC9673154 DOI: 10.1021/acschemneuro.2c00444] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
The relevant social and economic costs associated with aging and neurodegenerative diseases, particularly Alzheimer's disease (AD), entail considerable efforts to develop effective preventive and therapeutic strategies. The search for natural compounds, whose intake through diet can help prevent the main biochemical mechanisms responsible for AD onset, led us to screen hops, one of the main ingredients of beer. To explore the chemical variability of hops, we characterized four hop varieties, i.e., Cascade, Saaz, Tettnang, and Summit. We investigated the potential multitarget hop activity, in particular its ability to hinder Aβ1-42 peptide aggregation and cytotoxicity, its antioxidant properties, and its ability to enhance autophagy, promoting the clearance of misfolded and aggregated proteins in a human neuroblastoma SH-SY5Y cell line. Moreover, we provided evidence of in vivo hop efficacy using the transgenic CL2006Caenorhabditis elegans strain expressing the Aβ3-42 peptide. By combining cell-free and in vitro assays with nuclear magnetic resonance (NMR) and MS-based metabolomics, NMR molecular recognition studies, and atomic force microscopy, we identified feruloyl and p-coumaroylquinic acids flavan-3-ol glycosides and procyanidins as the main anti-Aβ components of hop.
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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,NeuroMI,
Milan Center for Neuroscience, University
of Milano-Bicocca, 20126 Milano, Italy,
| | - Valeria Mazzoni
- Department
of Biotechnology and Biosciences, University
of Milano-Bicocca, P.zza della Scienza 2, 20126 Milan, Italy
| | - Ada De Luigi
- Department
of Molecular Biochemistry and Pharmacology, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Via M. Negri 2, 20156 Milano, Italy
| | - Chiara Bruzzone
- Department
of Biotechnology and Biosciences, University
of Milano-Bicocca, P.zza della Scienza 2, 20126 Milan, Italy
| | - Gessica Sala
- NeuroMI,
Milan Center for Neuroscience, University
of Milano-Bicocca, 20126 Milano, Italy,School
of Medicine and Surgery, University of Milano-Bicocca, Via Cadore 48, 20900 Monza, Italy
| | - Laura Colombo
- Department
of Molecular Biochemistry and Pharmacology, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Via M. Negri 2, 20156 Milano, Italy
| | - Chiara Bazzini
- NeuroMI,
Milan Center for Neuroscience, University
of Milano-Bicocca, 20126 Milano, Italy,School
of Medicine and Surgery, University of Milano-Bicocca, Via Cadore 48, 20900 Monza, Italy
| | - Chiara Paola Zoia
- NeuroMI,
Milan Center for Neuroscience, University
of Milano-Bicocca, 20126 Milano, Italy,School
of Medicine and Surgery, University of Milano-Bicocca, Via Cadore 48, 20900 Monza, Italy
| | - Mariagiovanna Inserra
- Department
of Molecular Biochemistry and Pharmacology, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Via M. Negri 2, 20156 Milano, Italy
| | - Mario Salmona
- NeuroMI,
Milan Center for Neuroscience, University
of Milano-Bicocca, 20126 Milano, Italy
| | - Ivano De Noni
- Department
of Food, Environmental and Nutritional Sciences, University of Milano, Via Celoria 2, 20133 Milano, Italy
| | - Carlo Ferrarese
- NeuroMI,
Milan Center for Neuroscience, University
of Milano-Bicocca, 20126 Milano, Italy,School
of Medicine and Surgery, University of Milano-Bicocca, Via Cadore 48, 20900 Monza, Italy,Department
of Neuroscience, San Gerardo Hospital, ASST-Monza, Via Pergolesi 33, 20900 Monza, MB, Italy
| | - Luisa Diomede
- Department
of Molecular Biochemistry and Pharmacology, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Via M. Negri 2, 20156 Milano, Italy
| | - Cristina Airoldi
- Department
of Biotechnology and Biosciences, University
of Milano-Bicocca, P.zza della Scienza 2, 20126 Milan, Italy,NeuroMI,
Milan Center for Neuroscience, University
of Milano-Bicocca, 20126 Milano, Italy,
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8
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Sharma R, Kumari A, Kundu B, Grover A. Amyloid fibrillation of the glaucoma associated myocilin protein is inhibited by epicatechin gallate (ECG). RSC Adv 2022; 12:29469-29481. [PMID: 36320765 PMCID: PMC9562371 DOI: 10.1039/d2ra05061g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Accepted: 09/18/2022] [Indexed: 11/05/2022] Open
Abstract
Inherited glaucoma is a recent addition to the inventory of diseases arising due to protein misfolding. Mutations in the olfactomedin (OLF) domain of myocilin are the most common genetic cause behind this disease. Disease associated variants of m-OLF are predisposed to misfold and aggregate in the trabecular meshwork (TM) tissue of the eye. In recent years, the nature of these aggregates was revealed to exhibit the hallmarks of amyloids. Amyloid aggregates are highly stable structures that are formed, often with toxic consequences in a number of debilitating diseases. In spite of its clinical relevance the amyloidogenic nature of m-OLF has not been studied adequately. Here we have studied the amyloid fibrillation of m-OLF and report ECG as an inhibitor against it. Using biophysical and biochemical assays, coupled with advanced microscopic evaluations we show that ECG binds and stabilizes native m-OLF and thus prevents its aggregation into amyloid fibrils. Furthermore, we have used REMD simulations to delineate the stabilizing effects of ECG on the structure of m-OLF. Collectively, we report ECG as a molecular scaffold for designing and testing of novel inhibitors against m-OLF amyloid fibrillation.
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Affiliation(s)
- Ritika Sharma
- School of Biotechnology, Jawaharlal Nehru UniversityNew Delhi-110067India+91-8130738032
| | - Anchala Kumari
- Indian Council of Medical Research, International Health DivisionNew Delhi-110029India
| | - Bishwajit Kundu
- Kusuma School of Biological Sciences, Indian Institute of Technology DelhiHauz KhasNew DelhiIndia – 110016
| | - Abhinav Grover
- School of Biotechnology, Jawaharlal Nehru UniversityNew Delhi-110067India+91-8130738032
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9
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Ciaramelli C, Palmioli A, Angotti I, Colombo L, De Luigi A, Sala G, Salmona M, Airoldi C. NMR-Driven Identification of Cinnamon Bud and Bark Components With Anti-Aβ Activity. Front Chem 2022; 10:896253. [PMID: 35755250 PMCID: PMC9214034 DOI: 10.3389/fchem.2022.896253] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Accepted: 04/26/2022] [Indexed: 11/15/2022] Open
Abstract
The anti-Alzheimer disease (AD) activity reported for an aqueous cinnamon bark extract prompted us to investigate and compare the anti-amyloidogenic properties of cinnamon extracts obtained from both bark and bud, the latter being a very little explored matrix. We prepared the extracts with different procedures (alcoholic, hydroalcoholic, or aqueous extractions). An efficient protocol for the rapid analysis of NMR spectra of cinnamon bud and bark extracts was set up, enabling the automatic identification and quantification of metabolites. Moreover, we exploited preparative reverse-phase (RP) chromatography to prepare fractions enriched in polyphenols, further characterized by UPLC-HR-MS. Then, we combined NMR-based molecular recognition studies, atomic force microscopy, and in vitro biochemical and cellular assays to investigate the anti-amyloidogenic activity of our extracts. Both bud and bark extracts showed a potent anti-amyloidogenic activity. Flavanols, particularly procyanidins, and cinnamaldehydes, are the chemical components of cinnamon hindering Aβ peptide on-pathway aggregation and toxicity in a human neuroblastoma SH-SY5Y cell line. Together with the previously reported ability to hinder tau aggregation and filament formation, these data indicate cinnamon polyphenols as natural products possessing multitarget anti-AD activity. Since cinnamon is a spice increasingly present in the human diet, our results support its use to prepare nutraceuticals useful in preventing AD through an active contrast to the biochemical processes that underlie the onset of this disease. Moreover, the structures of cinnamon components responsible for cinnamon anti-AD activities represent molecular templates for designing and synthesizing new anti-amyloidogenic drugs.
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Affiliation(s)
- Carlotta Ciaramelli
- BioOrgNMR Lab, Department of Biotechnology and Biosciences, University of Milano-Bicocca, Milano, Italy.,Milan Center for Neuroscience (NeuroMI), University of Milano-Bicocca, Milano, Italy
| | - Alessandro Palmioli
- BioOrgNMR Lab, Department of Biotechnology and Biosciences, University of Milano-Bicocca, Milano, Italy.,Milan Center for Neuroscience (NeuroMI), University of Milano-Bicocca, Milano, Italy
| | - Irene Angotti
- BioOrgNMR Lab, Department of Biotechnology and Biosciences, University of Milano-Bicocca, Milano, Italy
| | - Laura Colombo
- Department of Molecular Biochemistry and Pharmacology, Istituto di Ricerche Farmacologiche "Mario Negri"- IRCCS, Milano, Italy
| | - Ada De Luigi
- Department of Molecular Biochemistry and Pharmacology, Istituto di Ricerche Farmacologiche "Mario Negri"- IRCCS, Milano, Italy
| | - Gessica Sala
- Milan Center for Neuroscience (NeuroMI), University of Milano-Bicocca, Milano, Italy.,School of Medicine and Surgery, University of Milano-Bicocca, Milano, Italy
| | - Mario Salmona
- Department of Molecular Biochemistry and Pharmacology, Istituto di Ricerche Farmacologiche "Mario Negri"- IRCCS, Milano, Italy
| | - Cristina Airoldi
- BioOrgNMR Lab, Department of Biotechnology and Biosciences, University of Milano-Bicocca, Milano, Italy.,Milan Center for Neuroscience (NeuroMI), University of Milano-Bicocca, Milano, Italy
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10
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Interactions of intrinsically disordered proteins with the unconventional chaperone human serum albumin: From mechanisms of amyloid inhibition to therapeutic opportunities. Biophys Chem 2022; 282:106743. [PMID: 35093643 DOI: 10.1016/j.bpc.2021.106743] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 12/09/2021] [Accepted: 12/09/2021] [Indexed: 12/29/2022]
Abstract
Human Serum Albumin (HSA), the most abundant protein in plasma, serves a diverse repertoire of biological functions including regulation of oncotic pressure and redox potential, transport of serum solutes, but also chaperoning of misfolded proteins. Here we review how HSA interacts with a wide spectrum of client proteins including intrinsically disordered proteins (IDPs) such as Aβ, the islet amyloid peptide (IAPP), alpha synuclein and stressed globular proteins such as insulin. The comparative analysis of the HSA chaperone - client interactions reveals that the amyloid-inhibitory function of HSA arises from at least four emerging mechanisms. Two mechanisms (the monomer stabilizer model and the monomer competitor model) involve the direct binding of HSA to either IDP monomers or oligomers, while other mechanisms (metal chelation and membrane protection) rely on the indirect modulation by HSA of other factors that drive IDP aggregation. While HSA is not the only extracellular chaperone, given its abundance, HSA is likely to account for a significant fraction of the chaperoning effects in plasma, thus opening new therapeutic opportunities in the context of the peripheral sink hypothesis.
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11
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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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12
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Fernandes L, Cardim-Pires TR, Foguel D, Palhano FL. Green Tea Polyphenol Epigallocatechin-Gallate in Amyloid Aggregation and Neurodegenerative Diseases. Front Neurosci 2021; 15:718188. [PMID: 34594185 PMCID: PMC8477582 DOI: 10.3389/fnins.2021.718188] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Accepted: 07/27/2021] [Indexed: 01/04/2023] Open
Abstract
The accumulation of protein aggregates in human tissues is a hallmark of more than 40 diseases called amyloidoses. In seven of these disorders, the aggregation is associated with neurodegenerative processes in the central nervous system such as Alzheimer’s disease (AD), Parkinson’s disease (PD), and Huntington’s disease (HD). The aggregation occurs when certain soluble proteins lose their physiological function and become toxic amyloid species. The amyloid assembly consists of protein filament interactions, which can form fibrillar structures rich in β-sheets. Despite the frequent incidence of these diseases among the elderly, the available treatments are limited and at best palliative, and new therapeutic approaches are needed. Among the many natural compounds that have been evaluated for their ability to prevent or delay the amyloidogenic process is epigallocatechin-3-gallate (EGCG), an abundant and potent polyphenolic molecule present in green tea that has extensive biological activity. There is evidence for EGCG’s ability to inhibit the aggregation of α-synuclein, amyloid-β, and huntingtin proteins, respectively associated with PD, AD, and HD. It prevents fibrillogenesis (in vitro and in vivo), reduces amyloid cytotoxicity, and remodels fibrils to form non-toxic amorphous species that lack seed propagation. Although it is an antioxidant, EGCG in an oxidized state can promote fibrils’ remodeling through formation of Schiff bases and crosslinking the fibrils. Moreover, microparticles to drug delivery were synthesized from oxidized EGCG and loaded with a second anti-amyloidogenic molecule, obtaining a synergistic therapeutic effect. Here, we describe several pre-clinical and clinical studies involving EGCG and neurodegenerative diseases and their related mechanisms.
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Affiliation(s)
- Luiza Fernandes
- Instituto de Bioquímica Médica Leopoldo de Meis, Programa de Biologia Estrutural, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Thyago R Cardim-Pires
- Instituto de Bioquímica Médica Leopoldo de Meis, Programa de Biologia Estrutural, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Debora Foguel
- Instituto de Bioquímica Médica Leopoldo de Meis, Programa de Biologia Estrutural, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Fernando L Palhano
- Instituto de Bioquímica Médica Leopoldo de Meis, Programa de Biologia Estrutural, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
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Gonçalves PB, Sodero ACR, Cordeiro Y. Green Tea Epigallocatechin-3-gallate (EGCG) Targeting Protein Misfolding in Drug Discovery for Neurodegenerative Diseases. Biomolecules 2021; 11:767. [PMID: 34065606 PMCID: PMC8160836 DOI: 10.3390/biom11050767] [Citation(s) in RCA: 38] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Revised: 05/14/2021] [Accepted: 05/16/2021] [Indexed: 12/15/2022] Open
Abstract
The potential to treat neurodegenerative diseases (NDs) of the major bioactive compound of green tea, epigallocatechin-3-gallate (EGCG), is well documented. Numerous findings now suggest that EGCG targets protein misfolding and aggregation, a common cause and pathological mechanism in many NDs. Several studies have shown that EGCG interacts with misfolded proteins such as amyloid beta-peptide (Aβ), linked to Alzheimer's disease (AD), and α-synuclein, linked to Parkinson's disease (PD). To date, NDs constitute a serious public health problem, causing a financial burden for health care systems worldwide. Although current treatments provide symptomatic relief, they do not stop or even slow the progression of these devastating disorders. Therefore, there is an urgent need to develop effective drugs for these incurable ailments. It is expected that targeting protein misfolding can serve as a therapeutic strategy for many NDs since protein misfolding is a common cause of neurodegeneration. In this context, EGCG may offer great potential opportunities in drug discovery for NDs. Therefore, this review critically discusses the role of EGCG in NDs drug discovery and provides updated information on the scientific evidence that EGCG can potentially be used to treat many of these fatal brain disorders.
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Affiliation(s)
| | | | - Yraima Cordeiro
- Faculty of Pharmacy, Federal University of Rio de Janeiro, Rio de Janeiro 21949-900, Brazil; (P.B.G.); (A.C.R.S.)
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14
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Palmioli A, Sperandeo P, Bertuzzi S, Polissi A, Airoldi C. On-cell saturation transfer difference NMR for the identification of FimH ligands and inhibitors. Bioorg Chem 2021; 112:104876. [PMID: 33845337 DOI: 10.1016/j.bioorg.2021.104876] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Revised: 03/14/2021] [Accepted: 03/25/2021] [Indexed: 12/23/2022]
Abstract
We describe the development of an on-cell NMR method for the rapid screening of FimH ligands and the structural identification of ligand binding epitopes. FimH is a mannose-binding bacterial adhesin expressed at the apical end of type 1 pili of uropathogenic bacterial strains and responsible for their d-mannose sensitive adhesion to host mammalian epithelial cells. Because of these properties, FimH is a key virulence factor and an attractive therapeutic target for urinary tract infection. We prepared synthetic d-mannose decorated dendrimers, we tested their ability to prevent the FimH-mediated yeast agglutination, and thus we used the compounds showing the best inhibitory activity as models of FimH multivalent ligands to set up our NMR methodology. Our experimental protocol, based on on-cell STD NMR techniques, is a suitable tool for the screening and the epitope mapping of FimH ligands aimed at the development of new antiadhesive and diagnostic tools against urinary tract infection pathogens. Notably, the study is carried out in a physiological environment, i.e. at the surface of living pathogen cells expressing FimH.
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Affiliation(s)
- Alessandro Palmioli
- BioOrg NMR Lab, Department of Biotechnology and Biosciences, University of Milano-Bicocca, P.zza della Scienza, 2, 20126 Milan, Italy.
| | - Paola Sperandeo
- Department of Pharmacological and Biomolecular Sciences, University of Milano, Via Balzaretti, 9/11/13, 20133 Milano, Italy
| | - Sara Bertuzzi
- BioOrg NMR Lab, Department of Biotechnology and Biosciences, University of Milano-Bicocca, P.zza della Scienza, 2, 20126 Milan, Italy; Chemical Glycobiology Lab, Center for Cooperative Research in Biosciences (CIC-bioGUNE), 48160 Derio, Spain
| | - Alessandra Polissi
- Department of Pharmacological and Biomolecular Sciences, University of Milano, Via Balzaretti, 9/11/13, 20133 Milano, Italy
| | - Cristina Airoldi
- BioOrg NMR Lab, Department of Biotechnology and Biosciences, University of Milano-Bicocca, P.zza della Scienza, 2, 20126 Milan, Italy.
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15
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Pagano K, Tomaselli S, Molinari H, Ragona L. Natural Compounds as Inhibitors of Aβ Peptide Aggregation: Chemical Requirements and Molecular Mechanisms. Front Neurosci 2020; 14:619667. [PMID: 33414705 PMCID: PMC7783407 DOI: 10.3389/fnins.2020.619667] [Citation(s) in RCA: 59] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Accepted: 12/04/2020] [Indexed: 12/29/2022] Open
Abstract
Alzheimer’s disease (AD) is one of the most common neurodegenerative disorders, with no cure and preventive therapy. Misfolding and extracellular aggregation of Amyloid-β (Aβ) peptides are recognized as the main cause of AD progression, leading to the formation of toxic Aβ oligomers and to the deposition of β-amyloid plaques in the brain, representing the hallmarks of AD. Given the urgent need to provide alternative therapies, natural products serve as vital resources for novel drugs. In recent years, several natural compounds with different chemical structures, such as polyphenols, alkaloids, terpenes, flavonoids, tannins, saponins and vitamins from plants have received attention for their role against the neurodegenerative pathological processes. However, only for a small subset of them experimental evidences are provided on their mechanism of action. This review focuses on those natural compounds shown to interfere with Aβ aggregation by direct interaction with Aβ peptide and whose inhibitory mechanism has been investigated by means of biophysical and structural biology experimental approaches. In few cases, the combination of approaches offering a macroscopic characterization of the oligomers, such as TEM, AFM, fluorescence, together with high-resolution methods could shed light on the complex mechanism of inhibition. In particular, solution NMR spectroscopy, through peptide-based and ligand-based observation, was successfully employed to investigate the interactions of the natural compounds with both soluble NMR-visible (monomer and low molecular weight oligomers) and NMR-invisible (high molecular weight oligomers and protofibrils) species. The molecular determinants of the interaction of promising natural compounds are here compared to infer the chemical requirements of the inhibitors and the common mechanisms of inhibition. Most of the data converge to indicate that the Aβ regions relevant to perturb the aggregation cascade and regulate the toxicity of the stabilized oligomers, are the N-term and β1 region. The ability of the natural aggregation inhibitors to cross the brain blood barrier, together with the tactics to improve their low bioavailability are discussed. The analysis of the data ensemble can provide a rationale for the selection of natural compounds as molecular scaffolds for the design of new therapeutic strategies against the progression of early and late stages of AD.
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Affiliation(s)
- Katiuscia Pagano
- NMR Laboratory, Istituto di Scienze e Tecnologie Chimiche (SCITEC), Consiglio Nazionale delle Ricerche - CNR, Milan, Italy
| | - Simona Tomaselli
- NMR Laboratory, Istituto di Scienze e Tecnologie Chimiche (SCITEC), Consiglio Nazionale delle Ricerche - CNR, Milan, Italy
| | - Henriette Molinari
- NMR Laboratory, Istituto di Scienze e Tecnologie Chimiche (SCITEC), Consiglio Nazionale delle Ricerche - CNR, Milan, Italy
| | - Laura Ragona
- NMR Laboratory, Istituto di Scienze e Tecnologie Chimiche (SCITEC), Consiglio Nazionale delle Ricerche - CNR, Milan, Italy
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16
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Cao R, Liu X, Liu Y, Zhai X, Cao T, Wang A, Qiu J. Applications of nuclear magnetic resonance spectroscopy to the evaluation of complex food constituents. Food Chem 2020; 342:128258. [PMID: 33508899 DOI: 10.1016/j.foodchem.2020.128258] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 09/10/2020] [Accepted: 09/27/2020] [Indexed: 11/18/2022]
Abstract
Due to a number of unparalleled advantages such as fastness, accuracy, intactness, nuclear magnetic resonance spectroscopy (NMR) has fulfilled a significant role in determining structures and dynamics of various physical, chemical and biological systems in the field of food analysis. This study introduced the principle of NMR, key NMR techniques such as 1H NMR, DOSY, NOESY, HSQC, etc., and the knowledge of NMR applications on the evaluation of complex food system, especially the interactions of food components. The reviewed research work provides sufficient evidence that NMR spectroscopy has been an invaluable tool and will play an increasingly important role in specific technical support for food assessment. In addition, NMR combined with various other technologies could give a complete picture of the mechanism of the performance of functional food compounds, which are vital for human health and influence the intrinsic food properties during processing, storage and transportation at the molecular level.
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Affiliation(s)
- Ruge Cao
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology and Business University, Beijing, China; State Key Laboratory of Food Nutrition and Safety, College of Food Science and Engineering, Tianjin University of Science and Technology, Tianjin 300457, China.
| | - Xinru Liu
- State Key Laboratory of Food Nutrition and Safety, College of Food Science and Engineering, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Yuqian Liu
- State Key Laboratory of Food Nutrition and Safety, College of Food Science and Engineering, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Xuqing Zhai
- State Key Laboratory of Food Nutrition and Safety, College of Food Science and Engineering, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Tianya Cao
- Institute of Food Science and Technology, Henan Agricultural University, Zhengzhou 450000, China
| | - Aili Wang
- Key laboratory of Coarse Cereal Processing (Ministry of Agriculture and Rural Affairs), College of Pharmacy and Biological Engineering, Chengdu University, Chengdu 610106, China
| | - Ju Qiu
- Institute of Food and Nutrition Development, Ministry of Agriculture, Haidian, Beijing 100081, China.
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Ciaramelli C, Palmioli A, De Luigi A, Colombo L, Sala G, Salmona M, Airoldi C. NMR-based Lavado cocoa chemical characterization and comparison with fermented cocoa varieties: Insights on cocoa's anti-amyloidogenic activity. Food Chem 2020; 341:128249. [PMID: 33038804 DOI: 10.1016/j.foodchem.2020.128249] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Revised: 09/12/2020] [Accepted: 09/26/2020] [Indexed: 01/10/2023]
Abstract
The metabolic profile of Lavado cocoa was characterized for the first time by NMR spectroscopy, then compared with the profiles of fermented and processed varieties, Natural and commercial cocoa. The significant difference in the contents of theobromine and flavanols prompted us to examine the cocoa varieties to seek correlations between these metabolite concentrations and the anti-amyloidogenic activity reported for cocoa in the literature. We combined NMR spectroscopy, preparative reversed-phase (RP) chromatography, atomic force microscopy, in vitro biochemical and cell assays, to investigate and compare the anti-amyloidogenic properties of extracts and fractions enriched in different metabolite classes. Lavado variety was the most active and the catechins and theobromine were the chemical components of cocoa hindering Aβ peptide on-pathway aggregation and toxicity in a human neuroblastoma SH-SY5Y cell line.
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Affiliation(s)
- Carlotta Ciaramelli
- BioOrgNMR Lab, Department of Biotechnologies and Biosciences, University of Milano-Bicocca, P.zza della Scienza 2, 20126 Milan, Italy; Milan Center for Neuroscience (NeuroMI), University of Milano-Bicocca, P.zza dell'Ateneo Nuovo 1, 20126 Milano Italy.
| | - Alessandro Palmioli
- BioOrgNMR Lab, Department of Biotechnologies and Biosciences, University of Milano-Bicocca, P.zza della Scienza 2, 20126 Milan, Italy; Milan Center for Neuroscience (NeuroMI), University of Milano-Bicocca, P.zza dell'Ateneo Nuovo 1, 20126 Milano Italy.
| | - Ada De Luigi
- Department of Biochemistry and Molecular Pharmacology, Istituto di Ricerche Farmacologiche "Mario Negri" IRCCS, Via Mario Negri 2, 20156 Milano, Italy.
| | - Laura Colombo
- Department of Biochemistry and Molecular Pharmacology, Istituto di Ricerche Farmacologiche "Mario Negri" IRCCS, Via Mario Negri 2, 20156 Milano, Italy.
| | - Gessica Sala
- School of Medicine and Surgery, University of Milano-Bicocca, Via Cadore 48, 20900 Monza, Italy; Milan Center for Neuroscience (NeuroMI), University of Milano-Bicocca, P.zza dell'Ateneo Nuovo 1, 20126 Milano Italy.
| | - Mario Salmona
- Department of Biochemistry and Molecular Pharmacology, Istituto di Ricerche Farmacologiche "Mario Negri" IRCCS, Via Mario Negri 2, 20156 Milano, Italy.
| | - Cristina Airoldi
- BioOrgNMR Lab, Department of Biotechnologies and Biosciences, University of Milano-Bicocca, P.zza della Scienza 2, 20126 Milan, Italy; Milan Center for Neuroscience (NeuroMI), University of Milano-Bicocca, P.zza dell'Ateneo Nuovo 1, 20126 Milano Italy.
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18
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Park G, Xue C, Wang H, Guo Z. Distinguishing the Effect on the Rate and Yield of Aβ42 Aggregation by Green Tea Polyphenol EGCG. ACS OMEGA 2020; 5:21497-21505. [PMID: 32905372 PMCID: PMC7469419 DOI: 10.1021/acsomega.0c02063] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Accepted: 08/10/2020] [Indexed: 05/15/2023]
Abstract
Deposition of Aβ42 aggregates in the form of amyloid plaques is a pathological hallmark of Alzheimer's disease. A desired avenue of intervention is the inhibition of Aβ42 aggregation. Epigallocatechin gallate (EGCG), the main polyphenol in green tea, has been generally considered an inhibitor of Aβ aggregation. However, previous experiments focused on the reduction of the amount of Aβ42 aggregates, while the effect of EGCG on the rate of Aβ42 aggregation was not critically analyzed. Here we performed an experimental evaluation of Aβ42 aggregation kinetics in the absence and presence of EGCG at a wide range of concentrations. We found that EGCG reduced thioflavin T fluorescence in an EGCG concentration-dependent manner, suggesting that EGCG reduced the amount of Aβ42 fibrils. The effect of EGCG on the rate of Aβ42 aggregation appears to be bimodal. We found that higher EGCG-to-Aβ42 ratios promoted the rate of Aβ42 aggregation, while lower EGCG-to-Aβ42 ratios inhibited the aggregation rate. To confirm that the reduction of thioflavin T fluorescence is due to the lowered aggregate quantity, but not due to perturbation of thioflavin T binding to Aβ42 fibrils, we probed the effect of EGCG on Aβ42 aggregation using site-directed spin labeling. Electron paramagnetic resonance of spin-labeled Aβ42 aggregates suggests that high EGCG-to-Aβ42 ratios led to a greatly reduced amount of Aβ42 fibrils, and these aggregates adopt similar structures as the fibrils in the no-EGCG sample. Potential implications of this work in designing prevention or therapeutic strategies using EGCG are discussed.
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Martinez Pomier K, Ahmed R, Melacini G. Catechins as Tools to Understand the Molecular Basis of Neurodegeneration. Molecules 2020; 25:E3571. [PMID: 32781559 PMCID: PMC7465241 DOI: 10.3390/molecules25163571] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 07/25/2020] [Accepted: 08/03/2020] [Indexed: 12/12/2022] Open
Abstract
Protein misfolding as well as the subsequent self-association and deposition of amyloid aggregates is implicated in the progression of several neurodegenerative disorders including Alzheimer's and Parkinson's diseases. Modulators of amyloidogenic aggregation serve as essential tools to dissect the underlying molecular mechanisms and may offer insight on potential therapeutic solutions. These modulators include green tea catechins, which are potent inhibitors of amyloid aggregation. Although catechins often exhibit poor pharmacokinetic properties and bioavailability, they are still essential tools for identifying the drivers of amyloid aggregation and for developing other aggregation modulators through structural mimicry. As an illustration of such strategies, here we review how catechins have been used to map the toxic surfaces of oligomeric amyloid-like species and develop catechin-based phenolic compounds with enhanced anti-amyloid activity.
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Affiliation(s)
- Karla Martinez Pomier
- Department of Chemistry and Chemical Biology, McMaster University, Hamilton, ON L8S 4M1, Canada;
| | - Rashik Ahmed
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, ON L8S 4M1, Canada;
| | - Giuseppe Melacini
- Department of Chemistry and Chemical Biology, McMaster University, Hamilton, ON L8S 4M1, Canada;
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, ON L8S 4M1, Canada;
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20
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Abstract
Tea is one of the most popular beverages in the world, and its processing involves a number of steps which includes fermentation. Tea fermentation is the most important step in determining the quality of tea. Currently, optimum fermentation of tea is detected by tasters using any of the following methods: monitoring change in color of tea as fermentation progresses and tasting and smelling the tea as fermentation progresses. These manual methods are not accurate. Consequently, they lead to a compromise in the quality of tea. This study proposes a deep learning model dubbed TeaNet based on Convolution Neural Networks (CNN). The input data to TeaNet are images from the tea Fermentation and Labelme datasets. We compared the performance of TeaNet with other standard machine learning techniques: Random Forest (RF), K-Nearest Neighbor (KNN), Decision Tree (DT), Support Vector Machine (SVM), Linear Discriminant Analysis (LDA), and Naive Bayes (NB). TeaNet was more superior in the classification tasks compared to the other machine learning techniques. However, we will confirm the stability of TeaNet in the classification tasks in our future studies when we deploy it in a tea factory in Kenya. The research also released a tea fermentation dataset that is available for use by the community.
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21
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On-cell saturation transfer difference NMR study of Bombesin binding to GRP receptor. Bioorg Chem 2020; 99:103861. [PMID: 32339813 DOI: 10.1016/j.bioorg.2020.103861] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2019] [Revised: 04/15/2020] [Accepted: 04/16/2020] [Indexed: 01/15/2023]
Abstract
We report the NMR characterization of the molecular interaction between Gastrin Releasing Peptide Receptor (GRP-R) and its natural ligand bombesin (BN). GRP-R is a transmembrane G-protein coupled receptor promoting the stimulation of cancer cell proliferation; in addition, being overexpressed on the surface of different human cancer cell lines, it is ideal for the development of new strategies for the selective targeted delivery of anticancer drugs and diagnostic devices to tumor cells. However, the design of new GRP-R binders requires structural information on receptor interaction with its natural ligands. The experimental protocol presented herein, based on on-cell STD NMR techniques, is a powerful tool for the screening and the epitope mapping of GRP-R ligands aimed at the development of new anticancer and diagnostic tools. Notably, the study can be carried out in a physiological environment, at the surface of tumoral cells overespressing GRP-R. Moreover, to the best of our knowledge, this is the first example of an NMR experiment able to detect and investigate the structural determinants of BN/GRP-R interaction.
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22
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Ahmed R, Akcan M, Khondker A, Rheinstädter MC, Bozelli JC, Epand RM, Huynh V, Wylie RG, Boulton S, Huang J, Verschoor CP, Melacini G. Atomic resolution map of the soluble amyloid beta assembly toxic surfaces. Chem Sci 2019; 10:6072-6082. [PMID: 31360412 PMCID: PMC6585597 DOI: 10.1039/c9sc01331h] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Accepted: 05/19/2019] [Indexed: 12/11/2022] Open
Abstract
Atomic resolution map of the soluble amyloid beta assembly (Aβn) “toxic surfaces” that facilitate the early pathogenic events in Alzheimer's disease (AD).
Soluble amyloid beta assemblies (Aβn) are neurotoxic and play a central role in the early phases of the pathogenesis cascade leading to Alzheimer's disease. However, the current knowledge about the molecular determinants of Aβn toxicity is at best scant. Here, we comparatively analyze Aβn prepared in the absence or presence of a catechin library that modulates cellular toxicity. By combining solution NMR with dynamic light scattering, fluorescence spectroscopy, electron microscopy, wide-angle X-ray diffraction and cell viability assays, we identify a cluster of unique molecular signatures that distinguish toxic vs. nontoxic Aβ assemblies. These include the exposure of a hydrophobic surface spanning residues 17–28 and the concurrent shielding of the highly charged N-terminus. We show that the combination of these two dichotomous structural transitions promotes the colocalization and insertion of β-sheet rich Aβn into the membrane, compromising membrane integrity. These previously elusive toxic surfaces mapped here provide an unprecedented foundation to establish structure-toxicity relationships of Aβ assemblies.
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Affiliation(s)
- Rashik Ahmed
- Department of Biochemistry and Biomedical Sciences , McMaster University , Hamilton , ON L8S 4M1 , Canada .
| | - Michael Akcan
- Department of Biochemistry and Biomedical Sciences , McMaster University , Hamilton , ON L8S 4M1 , Canada .
| | - Adree Khondker
- Department of Physics and Astronomy , McMaster University , Hamilton , ON L8S 4M1 , Canada
| | - Maikel C Rheinstädter
- Department of Physics and Astronomy , McMaster University , Hamilton , ON L8S 4M1 , Canada
| | - José C Bozelli
- Department of Biochemistry and Biomedical Sciences , McMaster University , Hamilton , ON L8S 4M1 , Canada .
| | - Richard M Epand
- Department of Biochemistry and Biomedical Sciences , McMaster University , Hamilton , ON L8S 4M1 , Canada .
| | - Vincent Huynh
- Department of Chemistry and Chemical Biology , McMaster University , Hamilton , ON L8S 4M1 , Canada
| | - Ryan G Wylie
- Department of Chemistry and Chemical Biology , McMaster University , Hamilton , ON L8S 4M1 , Canada
| | - Stephen Boulton
- Department of Biochemistry and Biomedical Sciences , McMaster University , Hamilton , ON L8S 4M1 , Canada .
| | - Jinfeng Huang
- Department of Chemistry and Chemical Biology , McMaster University , Hamilton , ON L8S 4M1 , Canada
| | - Chris P Verschoor
- Department of Health Research Methods, Evidence, and Impact (HEI) , McMaster University , Hamilton , ON L8S 4M1 , Canada
| | - Giuseppe Melacini
- Department of Biochemistry and Biomedical Sciences , McMaster University , Hamilton , ON L8S 4M1 , Canada . .,Department of Chemistry and Chemical Biology , McMaster University , Hamilton , ON L8S 4M1 , Canada
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23
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bioNMR-based identification of natural anti-Aβ compounds in Peucedanum ostruthium. Bioorg Chem 2019; 83:76-86. [DOI: 10.1016/j.bioorg.2018.10.016] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Revised: 10/07/2018] [Accepted: 10/09/2018] [Indexed: 01/20/2023]
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Farkhondeh T, Yazdi HS, Samarghandian S. The Protective Effects of Green Tea Catechins in the Management of Neurodegenerative Diseases: A Review. Curr Drug Discov Technol 2019; 16:57-65. [PMID: 29468975 DOI: 10.2174/1570163815666180219115453] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Revised: 01/03/2018] [Accepted: 01/26/2018] [Indexed: 06/08/2023]
Abstract
BACKGROUND The therapeutic strategies to manage neurodegenerative diseases remain limited and it is necessary to discover new agents for their prevention and control. Oxidative stress and inflammation play a main role in the pathogenesis of neurodegenerative diseases. The aim of this study is to review the effects of green tea catechins against the Neurodegenerative Diseases. METHODS In this study, we extensively reviewed all articles on the terms of Green tea, catechins, CNS disorders, and different diseases in PubMed, Science Direct, Scopus, and Google Scholar databases between the years 1990 and 2017. RESULTS The present study found that catechins, the major flavonoids in green tea, are powerful antioxidants and radical scavengers which possess the potential roles in the management of neurodegenerative diseases. Catechins modulate the cellular and molecular mechanisms through the inflammation-related NF-κB and the nuclear factor erythroid 2-related factor 2 (Nrf2) signaling pathways. CONCLUSION The findings of the present review shows catechins could be effective against neurodegenerative diseases due to their antioxidation and anti-inflammation effects and the involved biochemical pathways including Nrf2 and NF-kB signaling pathways.
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Affiliation(s)
- Tahereh Farkhondeh
- Cardiovascular Diseases Research Center, Birjand University of Medical Sciences, Birjand, Iran
| | | | - Saeed Samarghandian
- Department of Basic Medical Sciences, Neyshabur University of Medical Sciences, Neyshabur, Iran
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25
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Ciaramelli C, Palmioli A, De Luigi A, Colombo L, Sala G, Riva C, Zoia CP, Salmona M, Airoldi C. NMR-driven identification of anti-amyloidogenic compounds in green and roasted coffee extracts. Food Chem 2018; 252:171-180. [DOI: 10.1016/j.foodchem.2018.01.075] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2017] [Revised: 01/03/2018] [Accepted: 01/09/2018] [Indexed: 01/07/2023]
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26
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Elegbede JL, Li M, Jones OG, Campanella OH, Ferruzzi MG. Interactions Between Flavonoid-Rich Extracts and Sodium Caseinate Modulate Protein Functionality and Flavonoid Bioaccessibility in Model Food Systems. J Food Sci 2018; 83:1229-1236. [PMID: 29701895 DOI: 10.1111/1750-3841.14132] [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: 10/30/2017] [Accepted: 02/27/2018] [Indexed: 01/22/2023]
Abstract
With growing interest in formulating new food products with added protein and flavonoid-rich ingredients for health benefits, direct interactions between these ingredient classes becomes critical in so much as they may impact protein functionality, product quality, and flavonoids bioavailability. In this study, sodium caseinate (SCN)-based model products (foams and emulsions) were formulated with grape seed extract (GSE, rich in galloylated flavonoids) and green tea extract (GTE, rich in nongalloylated flavonoids), respectively, to assess changes in functional properties of SCN and impacts on flavonoid bioaccessibility. Experiments with pure flavonoids suggested that galloylated flavonoids reduced air-water interfacial tension of 0.01% SCN dispersions more significantly than nongalloylated flavonoids at high concentrations (>50 μg/mL). This observation was supported by changes in stability of 5% SCN foam, which showed that foam stability was increased at high levels of GSE (≥50 μg/mL, P < 0.05) but was not affected by GTE. However, flavonoid extracts had modest effects on SCN emulsion. In addition, galloylated flavonoids had higher bioaccessibility in both SCN foam and emulsion. These results suggest that SCN-flavonoid binding interactions can modulate protein functionality leading to difference in performance and flavonoid bioaccessibility of protein-based products. PRACTICAL APPLICATION As information on the beneficial health effects of flavonoids expands, it is likely that usage of these ingredients in consumer foods will increase. However, the necessary levels to provide such benefits may exceed those that begin to impact functionality of the macronutrients such as proteins. Flavonoid inclusion within protein matrices may modulate protein functionality in a food system and modify critical consumer traits or delivery of these beneficial plant-derived components. The product matrices utilized in this study offer relevant model systems to evaluate how fortification with flavonoid-rich extracts allows for differing effects on formability and stability of the protein-based systems, and on bioaccessibility of fortified flavonoid extracts.
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Affiliation(s)
- Jennifer L Elegbede
- W.K. Kellogg Inst. of Food and Nutrition Research, 2 Hamblin Ave East, Battle Creek, MI 49017, U.S.A
| | - Min Li
- North Carolina State Univ. - Plants for Human Health Inst., 600 Laureate Way, Kannapolis, NC 28081, U.S.A
| | - Owen G Jones
- Dept. of Food Science, Purdue Univ., 745 Agriculture Mall, West Lafayette, IN 47909, U.S.A
| | - Osvaldo H Campanella
- Dept. of Food Science and Dept. of Agricultural Engineering, Purdue Univ., 745 Agriculture Mall, West Lafayette, IN 47907, U.S.A
| | - Mario G Ferruzzi
- Dept. of Food, Bioprocessing and Nutrition Science, North Carolina State Univ. - Plants for Human Health Inst., 600 Laureate Way, Kannapolis, NC 28081, U.S.A
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27
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Ginex T, Trius M, Luque FJ. Computational Study of the Aza-Michael Addition of the Flavonoid (+)-Taxifolin in the Inhibition of β-Amyloid Fibril Aggregation. Chemistry 2018; 24:5813-5824. [PMID: 29384229 DOI: 10.1002/chem.201706072] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Indexed: 01/30/2023]
Abstract
Inhibition of abnormal protein self-aggregation is an attractive strategy against amyloidogenic diseases, but has found limited success due to the complexity of protein self-assembly, the absence of fully reproducible aggregation assays, and the scarce knowledge of the inhibition mechanisms by small molecules. In this context, catechol-containing compounds may lead to covalent adducts with amyloid fibrils that interfere with the aggregation process. In particular, the covalent adduct formed between the oxidized form of (+)-taxifolin and an β-amyloid (Aβ42) suggests the involvement of a specific recognition motif that enables the chemical reaction with Aβ42. In this study, we have examined the mechanisms implicated in the aza-Michael addition of the o-quinone species of (+)-taxifolin with Aβ42 fibrils. The results support the binding of (+)-taxifolin to the hydrophobic groove delimited by the edges defined by Lys16 and Glu22 residues in the fibril. The chemical reaction proceeds through the nucleophilic attack of the deprotonated amino group of a Lys16 residue in a process activated by the interaction between the o-quinone ring with a vicinal Lys16 residue, as well as by a water-assisted proton transfer, which is the rate-limiting step of the reaction. This specific inhibition mechanism, which may explain the enhanced anti-aggregating activity of oxidized flavonoids compared to fresh compounds, holds promise for developing disease-modifying therapies.
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Affiliation(s)
- Tiziana Ginex
- Department of Nutrition, Food Science, and Gastronomy, Faculty of Pharmacy and Institute of Biomedicine, Campus Torribera, University of Barcelona, Santa Coloma de Gramenet, 08921, Spain
| | - Marta Trius
- Department of Nutrition, Food Science, and Gastronomy, Faculty of Pharmacy and Institute of Biomedicine, Campus Torribera, University of Barcelona, Santa Coloma de Gramenet, 08921, Spain
| | - F Javier Luque
- Department of Nutrition, Food Science, and Gastronomy, Faculty of Pharmacy and Institute of Biomedicine, Campus Torribera, University of Barcelona, Santa Coloma de Gramenet, 08921, Spain
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28
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Visentin C, Pellistri F, Natalello A, Vertemara J, Bonanomi M, Gatta E, Penco A, Relini A, De Gioia L, Airoldi C, Regonesi ME, Tortora P. Epigallocatechin-3-gallate and related phenol compounds redirect the amyloidogenic aggregation pathway of ataxin-3 towards non-toxic aggregates and prevent toxicity in neural cells and Caenorhabditis elegans animal model. Hum Mol Genet 2018. [PMID: 28633380 DOI: 10.1093/hmg/ddx211] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The protein ataxin-3 (ATX3) triggers an amyloid-related neurodegenerative disease when its polyglutamine stretch is expanded beyond a critical threshold. We formerly demonstrated that the polyphenol epigallocatechin-3-gallate (EGCG) could redirect amyloid aggregation of a full-length, expanded ATX3 (ATX3-Q55) towards non-toxic, soluble, SDS-resistant aggregates. Here, we have characterized other related phenol compounds, although smaller in size, i.e. (-)-epigallocatechin gallate (EGC), and gallic acid (GA). We analysed the aggregation pattern of ATX3-Q55 and of the N-terminal globular Josephin domain (JD) by assessing the time course of the soluble protein, as well its structural features by FTIR and AFM, in the presence and the absence of the mentioned compounds. All of them redirected the aggregation pattern towards soluble, SDS-resistant aggregates. They also prevented the appearance of ordered side-chain hydrogen bonding in ATX3-Q55, which is the hallmark of polyQ-related amyloids. Molecular docking analyses on the JD highlighted three interacting regions, including the central, aggregation-prone one. All three compounds bound to each of them, although with different patterns. This might account for their capability to prevent amyloidogenesis. Saturation transfer difference NMR experiments also confirmed EGCG and EGC binding to monomeric JD. ATX3-Q55 pre-incubation with any of the three compounds prevented its calcium-influx-mediated cytotoxicity towards neural cells. Finally, all the phenols significantly reduced toxicity in a transgenic Caenorhabditis elegans strain expressing an expanded ATX3. Overall, our results show that the three polyphenols act in a substantially similar manner. GA, however, might be more suitable for antiamyloid treatments due to its simpler structure and higher chemical stability.
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Affiliation(s)
- Cristina Visentin
- Department of Biotechnologies and Biosciences, University of Milano-Bicocca, 20126 Milan, Italy
| | | | - Antonino Natalello
- Department of Biotechnologies and Biosciences, University of Milano-Bicocca, 20126 Milan, Italy.,Milan Center of Neuroscience (NeuroMI), 20126 Milan, Italy
| | - Jacopo Vertemara
- Department of Biotechnologies and Biosciences, University of Milano-Bicocca, 20126 Milan, Italy
| | - Marcella Bonanomi
- Department of Biotechnologies and Biosciences, University of Milano-Bicocca, 20126 Milan, Italy
| | - Elena Gatta
- Department of Physics, University of Genoa, 16146 Genoa, Italy
| | - Amanda Penco
- Department of Physics, University of Genoa, 16146 Genoa, Italy.,Department of Molecular Medicine, University of Pavia, 27100 Pavia, Italy
| | - Annalisa Relini
- Department of Physics, University of Genoa, 16146 Genoa, Italy.,National Institute of Biostructures and Biosystems (INBB), 00136 Rome, Italy
| | - Luca De Gioia
- Department of Biotechnologies and Biosciences, University of Milano-Bicocca, 20126 Milan, Italy
| | - Cristina Airoldi
- Department of Biotechnologies and Biosciences, University of Milano-Bicocca, 20126 Milan, Italy.,Milan Center of Neuroscience (NeuroMI), 20126 Milan, Italy
| | - Maria E Regonesi
- Department of Biotechnologies and Biosciences, University of Milano-Bicocca, 20126 Milan, Italy.,Milan Center of Neuroscience (NeuroMI), 20126 Milan, Italy
| | - Paolo Tortora
- Department of Biotechnologies and Biosciences, University of Milano-Bicocca, 20126 Milan, Italy.,Milan Center of Neuroscience (NeuroMI), 20126 Milan, Italy
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29
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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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30
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Ahmed R, VanSchouwen B, Jafari N, Ni X, Ortega J, Melacini G. Molecular Mechanism for the (-)-Epigallocatechin Gallate-Induced Toxic to Nontoxic Remodeling of Aβ Oligomers. J Am Chem Soc 2017; 139:13720-13734. [PMID: 28841302 DOI: 10.1021/jacs.7b05012] [Citation(s) in RCA: 78] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
(-)-Epigallocatechin gallate (EGCG) effectively reduces the cytotoxicity of the Alzheimer's disease β-amyloid peptide (Aβ) by remodeling seeding-competent Aβ oligomers into off-pathway seeding-incompetent Aβ assemblies. However, the mechanism of EGCG-induced remodeling is not fully understood. Here we combine 15N and 1H dark-state exchange saturation transfer (DEST), relaxation, and chemical shift projection NMR analyses with fluorescence, dynamic light scattering, and electron microscopy to elucidate how EGCG remodels Aβ oligomers. We show that the remodeling adheres to a Hill-Scatchard model whereby the Aβ(1-40) self-association occurs cooperatively and generates Aβ(1-40) oligomers with multiple independent binding sites for EGCG with a Kd ∼10-fold lower than that for the Aβ(1-40) monomers. Upon binding to EGCG, the Aβ(1-40) oligomers become less solvent exposed, and the β-regions, which are involved in direct monomer-protofibril contacts in the absence of EGCG, undergo a direct-to-tethered contact shift. This switch toward less engaged monomer-protofibril contacts explains the seeding incompetency observed upon EGCG remodeling and suggests that EGCG interferes with secondary nucleation events known to generate toxic Aβ assemblies. Unexpectedly, the N-terminal residues experience an opposite EGCG-induced shift from tethered to direct contacts, explaining why EGCG remodeling occurs without release of Aβ(1-40) monomers. We also show that upon binding Aβ(1-40) oligomers the relative positions of the EGCG B and D rings change with respect to that of ring A. These distinct structural changes occurring in both Aβ(1-40) oligomers and EGCG during remodeling offer a foundation for understanding the molecular mechanism of EGCG as a neurotoxicity inhibitor. Furthermore, the results reported here illustrate the effectiveness of DEST-based NMR approaches in investigating the mechanism of low-molecular-weight amyloid inhibitors.
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Affiliation(s)
- Rashik Ahmed
- Department of Biochemistry and Biomedical Sciences and ‡Department of Chemistry and Chemical Biology, McMaster University , 1280 Main Street West, Hamilton, Ontario L8S 4M1, Canada
| | - Bryan VanSchouwen
- Department of Biochemistry and Biomedical Sciences and ‡Department of Chemistry and Chemical Biology, McMaster University , 1280 Main Street West, Hamilton, Ontario L8S 4M1, Canada
| | - Naeimeh Jafari
- Department of Biochemistry and Biomedical Sciences and ‡Department of Chemistry and Chemical Biology, McMaster University , 1280 Main Street West, Hamilton, Ontario L8S 4M1, Canada
| | - Xiaodan Ni
- Department of Biochemistry and Biomedical Sciences and ‡Department of Chemistry and Chemical Biology, McMaster University , 1280 Main Street West, Hamilton, Ontario L8S 4M1, Canada
| | - Joaquin Ortega
- Department of Biochemistry and Biomedical Sciences and ‡Department of Chemistry and Chemical Biology, McMaster University , 1280 Main Street West, Hamilton, Ontario L8S 4M1, Canada
| | - Giuseppe Melacini
- Department of Biochemistry and Biomedical Sciences and ‡Department of Chemistry and Chemical Biology, McMaster University , 1280 Main Street West, Hamilton, Ontario L8S 4M1, Canada
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31
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Guzzi C, Colombo L, Luigi AD, Salmona M, Nicotra F, Airoldi C. Flavonoids and Their Glycosides as Anti-amyloidogenic Compounds: Aβ1-42 Interaction Studies to Gain New Insights into Their Potential for Alzheimer's Disease Prevention and Therapy. Chem Asian J 2016; 12:67-75. [DOI: 10.1002/asia.201601291] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2016] [Revised: 10/19/2016] [Indexed: 12/24/2022]
Affiliation(s)
- Cinzia Guzzi
- Department of Biotecnology and Bioscience; University of Milano-Bicocca; Piazza della Scienza 2 I-20126 Milan Italy
| | - Laura Colombo
- Department Biochemistry and Molecular Pharmacology; IRCCS-Istituto di Ricerche Farmacologiche “Mario Negri”; Via Giuseppe La Masa, 19 20156 Milan Italy
| | - Ada De Luigi
- Department Biochemistry and Molecular Pharmacology; IRCCS-Istituto di Ricerche Farmacologiche “Mario Negri”; Via Giuseppe La Masa, 19 20156 Milan Italy
| | - Mario Salmona
- Department Biochemistry and Molecular Pharmacology; IRCCS-Istituto di Ricerche Farmacologiche “Mario Negri”; Via Giuseppe La Masa, 19 20156 Milan Italy
| | - Francesco Nicotra
- Department of Biotecnology and Bioscience; University of Milano-Bicocca; Piazza della Scienza 2 I-20126 Milan Italy
- Milan Center of Neuroscience (NeuroMI); 20126 Milan Italy
| | - Cristina Airoldi
- Department of Biotecnology and Bioscience; University of Milano-Bicocca; Piazza della Scienza 2 I-20126 Milan Italy
- Milan Center of Neuroscience (NeuroMI); 20126 Milan Italy
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32
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Tea Category Identification Using a Novel Fractional Fourier Entropy and Jaya Algorithm. ENTROPY 2016. [DOI: 10.3390/e18030077] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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33
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Ferri E, Galimberti A, Casiraghi M, Airoldi C, Ciaramelli C, Palmioli A, Mezzasalma V, Bruni I, Labra M. Towards a Universal Approach Based on Omics Technologies for the Quality Control of Food. BIOMED RESEARCH INTERNATIONAL 2015; 2015:365794. [PMID: 26783518 PMCID: PMC4691458 DOI: 10.1155/2015/365794] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Accepted: 11/19/2015] [Indexed: 12/03/2022]
Abstract
In the last decades, food science has greatly developed, turning from the consideration of food as mere source of energy to a growing awareness on its importance for health and particularly in reducing the risk of diseases. Such vision led to an increasing attention towards the origin and quality of raw materials as well as their derived food products. The continuous advance in molecular biology allowed setting up efficient and universal omics tools to unequivocally identify the origin of food items and their traceability. In this review, we considered the application of a genomics approach known as DNA barcoding in characterizing the composition of foodstuffs and its traceability along the food supply chain. Moreover, metabolomics analytical strategies based on Nuclear Magnetic Resonance (NMR) and Mass Spectroscopy (MS) were discussed as they also work well in evaluating food quality. The combination of both approaches allows us to define a sort of molecular labelling of food that is easily understandable by the operators involved in the food sector: producers, distributors, and consumers. Current technologies based on digital information systems such as web platforms and smartphone apps can facilitate the adoption of such molecular labelling.
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Affiliation(s)
- Emanuele Ferri
- FEM2 Ambiente s.r.l., P.za della Scienza 2, 20126 Milan, Italy
| | - Andrea Galimberti
- ZooPlantLab, Department of Biotechnology and Biosciences, University of Milano-Bicocca, P.za della Scienza 2, 20126 Milan, Italy
| | - Maurizio Casiraghi
- ZooPlantLab, Department of Biotechnology and Biosciences, University of Milano-Bicocca, P.za della Scienza 2, 20126 Milan, Italy
| | - Cristina Airoldi
- BioNMR Lab, Department of Biotechnology and Biosciences, University of Milano-Bicocca, P.za della Scienza 2, 20126 Milan, Italy
| | - Carlotta Ciaramelli
- BioNMR Lab, Department of Biotechnology and Biosciences, University of Milano-Bicocca, P.za della Scienza 2, 20126 Milan, Italy
| | - Alessandro Palmioli
- FEM2 Ambiente s.r.l., P.za della Scienza 2, 20126 Milan, Italy
- BioNMR Lab, Department of Biotechnology and Biosciences, University of Milano-Bicocca, P.za della Scienza 2, 20126 Milan, Italy
| | - Valerio Mezzasalma
- ZooPlantLab, Department of Biotechnology and Biosciences, University of Milano-Bicocca, P.za della Scienza 2, 20126 Milan, Italy
| | - Ilaria Bruni
- ZooPlantLab, Department of Biotechnology and Biosciences, University of Milano-Bicocca, P.za della Scienza 2, 20126 Milan, Italy
| | - Massimo Labra
- ZooPlantLab, Department of Biotechnology and Biosciences, University of Milano-Bicocca, P.za della Scienza 2, 20126 Milan, Italy
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34
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Airoldi C, D'Orazio G, Richichi B, Guzzi C, Baldoneschi V, Colombo L, Salmona M, Nativi C, Nicotra F, La Ferla B. Structural Modifications ofcis-Glycofused Benzopyran Compounds and Their Influence on the Binding to Amyloid-β Peptide. Chem Asian J 2015; 11:299-309. [DOI: 10.1002/asia.201501114] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Indexed: 01/22/2023]
Affiliation(s)
- Cristina Airoldi
- Department of Biotecnology and Bioscience (Btbs); University of Milano-Bicocca; Piazza della Scienza 2 I-20126 Milan Italy
| | - Giuseppe D'Orazio
- Department of Biotecnology and Bioscience (Btbs); University of Milano-Bicocca; Piazza della Scienza 2 I-20126 Milan Italy
| | - Barbara Richichi
- Department of Chemistry “Ugo Schiff”; University of Florence; Via della Lastruccia 3-13 I-50019 Sesto Fiorentino (FI) Italy
| | - Cinzia Guzzi
- Department of Biotecnology and Bioscience (Btbs); University of Milano-Bicocca; Piazza della Scienza 2 I-20126 Milan Italy
| | - Veronica Baldoneschi
- Department of Chemistry “Ugo Schiff”; University of Florence; Via della Lastruccia 3-13 I-50019 Sesto Fiorentino (FI) Italy
| | - Laura Colombo
- Department Biochemistry and Molecular Pharmacology; IRCCS-Istituto di Ricerche Farmacologiche “Mario Negri”; Via Giuseppe La Masa, 19 20156 Milano Italy
| | - Mario Salmona
- Department Biochemistry and Molecular Pharmacology; IRCCS-Istituto di Ricerche Farmacologiche “Mario Negri”; Via Giuseppe La Masa, 19 20156 Milano Italy
| | - Cristina Nativi
- Department of Chemistry “Ugo Schiff”; University of Florence; Via della Lastruccia 3-13 I-50019 Sesto Fiorentino (FI) Italy
| | - Francesco Nicotra
- Department of Biotecnology and Bioscience (Btbs); University of Milano-Bicocca; Piazza della Scienza 2 I-20126 Milan Italy
| | - Barbara La Ferla
- Department of Biotecnology and Bioscience (Btbs); University of Milano-Bicocca; Piazza della Scienza 2 I-20126 Milan Italy
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35
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Bonanomi M, Visentin C, Natalello A, Spinelli M, Vanoni M, Airoldi C, Regonesi ME, Tortora P. How Epigallocatechin-3-gallate and Tetracycline Interact with the Josephin Domain of Ataxin-3 and Alter Its Aggregation Mode. Chemistry 2015; 21:18383-93. [PMID: 26538519 DOI: 10.1002/chem.201503086] [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: 08/05/2015] [Indexed: 12/17/2022]
Abstract
Epigallocatechin-3-gallate (EGCG) and tetracycline are two known inhibitors of amyloid aggregation able to counteract the fibrillation of most of the proteins involved in neurodegenerative diseases. We have recently investigated their effect on ataxin-3 (AT3), the polyglutamine-containing protein responsible for spinocerebellar ataxia type 3. We previously showed that EGCG and tetracycline can contrast the aggregation process and toxicity of expanded AT3, although by different mechanisms. Here, we have performed further experiments by using the sole Josephin domain (JD) to further elucidate the mechanism of action of the two compounds. By protein solubility assays and FTIR spectroscopy we have first observed that EGCG and tetracycline affect the JD aggregation essentially in the same way displayed when acting on the full-length expanded AT3. Then, by saturation transfer difference (STD) NMR experiments, we have shown that EGCG binds both the monomeric and the oligomeric JD form, whereas tetracycline can only interact with the oligomeric one. Surface plasmon resonance (SPR) analysis has confirmed the capability of the sole EGCG to bind monomeric JD, although with a KD value suggestive for a non-specific interaction. Our investigations provide new details on the JD interaction with EGCG and tetracycline, which could explain the different mechanisms by which the two compounds reduce the toxicity of AT3.
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Affiliation(s)
- Marcella Bonanomi
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, Piazza della Scienza 2, 20126 Milano (Italy)
| | - Cristina Visentin
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, Piazza della Scienza 2, 20126 Milano (Italy)
| | - Antonino Natalello
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, Piazza della Scienza 2, 20126 Milano (Italy).,Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia (CNISM), UdR Milano-Bicocca, Milano (Italy).,Milan Center of Neuroscience (NeuroMI), 20126 Milano (Italy)
| | - Michela Spinelli
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, Piazza della Scienza 2, 20126 Milano (Italy).,SysBio Centre for Systems Biology, Milano and Rome (Italy)
| | - Marco Vanoni
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, Piazza della Scienza 2, 20126 Milano (Italy).,Milan Center of Neuroscience (NeuroMI), 20126 Milano (Italy).,SysBio Centre for Systems Biology, Milano and Rome (Italy)
| | - Cristina Airoldi
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, Piazza della Scienza 2, 20126 Milano (Italy). .,Milan Center of Neuroscience (NeuroMI), 20126 Milano (Italy). .,SysBio Centre for Systems Biology, Milano and Rome (Italy).
| | - Maria E Regonesi
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, Piazza della Scienza 2, 20126 Milano (Italy). .,Milan Center of Neuroscience (NeuroMI), 20126 Milano (Italy).
| | - Paolo Tortora
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, Piazza della Scienza 2, 20126 Milano (Italy).,Milan Center of Neuroscience (NeuroMI), 20126 Milano (Italy)
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36
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Reddy RR, Phani Kumar BVN, Shanmugam G, Madhan B, Mandal AB. Molecular Level Insights on Collagen–Polyphenols Interaction Using Spin–Relaxation and Saturation Transfer Difference NMR. J Phys Chem B 2015; 119:14076-85. [DOI: 10.1021/acs.jpcb.5b07911] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- R. Ravikanth Reddy
- Academy of Scientific and Innovative Research (AcSIR), Anusandhan Bhavan, 2 Rafi Marg, New Delhi 110 001, India
| | - Bandaru V. N. Phani Kumar
- Academy of Scientific and Innovative Research (AcSIR), Anusandhan Bhavan, 2 Rafi Marg, New Delhi 110 001, India
| | - Ganesh Shanmugam
- Academy of Scientific and Innovative Research (AcSIR), Anusandhan Bhavan, 2 Rafi Marg, New Delhi 110 001, India
| | - Balaraman Madhan
- Academy of Scientific and Innovative Research (AcSIR), Anusandhan Bhavan, 2 Rafi Marg, New Delhi 110 001, India
| | - Asit B. Mandal
- Academy of Scientific and Innovative Research (AcSIR), Anusandhan Bhavan, 2 Rafi Marg, New Delhi 110 001, India
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37
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Identification of Green, Oolong and Black Teas in China via Wavelet Packet Entropy and Fuzzy Support Vector Machine. ENTROPY 2015. [DOI: 10.3390/e17106663] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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