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Dey P, Biswas P. Effect of caffeine on the aggregation of amyloid-β-A 3D RISM study. J Chem Phys 2024; 160:125101. [PMID: 38516974 DOI: 10.1063/5.0202636] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2024] [Accepted: 03/10/2024] [Indexed: 03/23/2024] Open
Abstract
Alzheimer's disease is a detrimental neurological disorder caused by the formation of amyloid fibrils due to the aggregation of amyloid-β peptide. The primary therapeutic approaches for treating Alzheimer's disease are targeted to prevent this amyloid fibril formation using potential inhibitor molecules. The discovery of such inhibitor molecules poses a formidable challenge to the design of anti-amyloid drugs. This study investigates the effect of caffeine on dimer formation of the full-length amyloid-β using a combined approach of all-atom, explicit water molecular dynamics simulations and the three-dimensional reference interaction site model theory. The change in the hydration free energy of amyloid-β dimer, with and without the inhibitor molecules, is calculated with respect to the monomeric amyloid-β, where the hydration free energy is decomposed into energetic and entropic components, respectively. Dimerization is accompanied by a positive change in the partial molar volume. Dimer formation is spontaneous, which implies a decrease in the hydration free energy. However, a reverse trend is observed for the dimer with inhibitor molecules. It is observed that the negatively charged residues primarily contribute for the formation of the amyloid-β dimer. A residue-wise decomposition reveals that hydration/dehydration of the side-chain atoms of the charged amino acid residues primarily contribute to dimerization.
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Affiliation(s)
- Priya Dey
- Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Parbati Biswas
- Department of Chemistry, University of Delhi, Delhi 110007, India
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2
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Rahman A, Saikia B, Baruah A. In silico analysis of SOD1 aggregation inhibition modes of tertiary amine pyrazolone and pyrano coumarin ferulate as ALS drug candidates. Phys Chem Chem Phys 2023; 25:26833-26846. [PMID: 37782142 DOI: 10.1039/d3cp03978a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/03/2023]
Abstract
Amyotrophic lateral sclerosis (ALS) is a fatal neurodegenerative disease, the familial form (fALS) of which is often cognate to mutations in the antioxidant enzyme Cu/Zn superoxide dismutase 1 (SOD1) leading to misfolding and aggregation. Two small molecules, a tertiary amine pyrazolone (TAP) and a pyrano coumarin ferulate (PCF) were suggested to be ALS drug candidates following experimental observation of their ability to inhibit SOD1 protein misfolding and aggregation. The present work aims at computational investigation of these experimentally proposed drug candidates to gain insight into their mechanism of SOD1 misfolding and aggregation inhibition. On the basis of molecular docking, molecular dynamics simulation, MM-PBSA and per-residue energy decomposition analysis, we examined the specific interactions of TAP and PCF with three probable binding sites of SOD1, namely, dimeric interface cavity, W32 and, UMP binding sites. Results suggest that the binding of TAP at W32 and at UMP sites are least probable due to absence of any favorable interaction. The binding of TAP to dimeric cavity is also unstable due to strong unfavorable interactions. In case of PCF, binding at the UMP site is least probable while binding at dimeric cavity is accompanied by unfavorable interactions. PCF, however, exhibits stable binding with the W32 binding site of SOD1 by stabilizing the solvent accessible hydrophobic residues, which otherwise would have acted as contact points for aggregation. Thus the results imply that compound PCF functions as an inhibitior of SOD1 misfolding/aggregation through direct interaction with the protein SOD1 at the W32 binding site. However, TAP is likely to act as an inhibitor through a different mechanism rather than direct interaction with the protein SOD1. These results apart from reinforcing previous experimental findings, shed light on the probable mechanism of action of the proposed drug candidates.
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Affiliation(s)
- Aziza Rahman
- Department of Chemistry, Dibrugarh University, Dibrugarh, Assam, 786004, India.
| | - Bondeepa Saikia
- Department of Chemistry, Dibrugarh University, Dibrugarh, Assam, 786004, India.
| | - Anupaul Baruah
- Department of Chemistry, Dibrugarh University, Dibrugarh, Assam, 786004, India.
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3
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Machado F, Coimbra MA, Castillo MDD, Coreta-Gomes F. Mechanisms of action of coffee bioactive compounds - a key to unveil the coffee paradox. Crit Rev Food Sci Nutr 2023:1-23. [PMID: 37338423 DOI: 10.1080/10408398.2023.2221734] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/21/2023]
Abstract
The knowledge of the relationship between the chemical structure of food components with their mechanisms of action is crucial for the understanding of diet health benefits. This review relates the chemical variability present in coffee beverages with the mechanisms involved in key physiological events, supporting coffee as a polyvalent functional food. Coffee intake has been related with several health-promoting properties such as neuroprotective (caffeine, chlorogenic acids and melanoidins), anti-inflammatory (caffeine, chlorogenic acids, melanoidins, diterpenes), microbiota modulation (polysaccharides, melanoidins, chlorogenic acids), immunostimulatory (polysaccharides), antidiabetic (trigonelline, chlorogenic acids), antihypertensive (chlorogenic acids) and hypocholesterolemic (polysaccharides, chlorogenic acids, lipids). Nevertheless, caffeine and diterpenes are coffee components with ambivalent effects on health. Additionally, a large range of potentially harmful compounds, including acrylamide, hydroxymethylfurfural, furan, and advanced glycation end products, are formed during the roasting of coffee and are present in the beverages. However, coffee beverages are part of the daily human dietary healthy habits, configuring a coffee paradox.
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Affiliation(s)
- Fernanda Machado
- LAQV-REQUIMTE, Chemistry Department, University of Aveiro, Aveiro, Portugal
| | - Manuel A Coimbra
- LAQV-REQUIMTE, Chemistry Department, University of Aveiro, Aveiro, Portugal
| | | | - Filipe Coreta-Gomes
- LAQV-REQUIMTE, Chemistry Department, University of Aveiro, Aveiro, Portugal
- Department of Chemistry, Coimbra Chemistry Centre - Institute of Molecular Sciences (CQC-IMS), University of Coimbra, Coimbra, Portugal
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Roy R, Paul S. Illustrating the Effect of Small Molecules Derived from Natural Resources on Amyloid Peptides. J Phys Chem B 2023; 127:600-615. [PMID: 36638829 DOI: 10.1021/acs.jpcb.2c07607] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
The onset of amyloidogenic diseases is associated with the misfolding and aggregation of proteins. Despite extensive research, no effective therapeutics are yet available to treat these chronic degenerative diseases. Targeting the aggregation of disease-specific proteins is regarded as a promising new approach to treat these diseases. In the past few years, rapid progress in this field has been made in vitro, in vivo, and in silico to generate potential drug candidates, ranging from small molecules to polymers to nanoparticles. Small molecular probes, mostly those derived from natural sources, have been of particular interest among amyloid inhibitors. Here, we summarize some of the most important natural small molecular probes which can inhibit the aggregation of Aβ, hIAPP, and α-syn peptides and discuss how their binding efficacy and preference for the peptides vary with their structure and conformation. This provides a comprehensive idea of the crucial factors which should be incorporated into the future design of novel drug candidates useful for the treatment of amyloid diseases.
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Affiliation(s)
- Rituparna Roy
- Department of Chemistry, Indian Institute of Technology, Guwahati Assam-781039, India
| | - Sandip Paul
- Department of Chemistry, Indian Institute of Technology, Guwahati Assam-781039, India
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5
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Pal T, Sahoo S, Prasad Ghanta K, Bandyopadhyay S. Computational Investigation of Conformational Fluctuations of Aβ42 Monomers in Aqueous Ionic Liquid Mixtures. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Pal T, Paul R, Paul S. Phenylpropanoids on the Inhibition of β-Amyloid Aggregation and the Movement of These Molecules through the POPC Lipid Bilayer. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:7775-7790. [PMID: 35687701 DOI: 10.1021/acs.langmuir.2c00827] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Alzheimer's disease (AD), caused by Aβ aggregation, is a major concern in medical research. It is a neurodegenerative disorder, leading to a loss of cognitive abilities, which is still claiming the lives of many people all over the world. This poses a challenge before the scientific community to discover effective drugs which can prevent such toxic aggregation. Recent experimental findings suggest the potency of two naturally-occurring phenylpropanoids, Schizotenuin A (SCH) and Lycopic Acid B (LAB) which can effectively combat the deleterious effects of Aβ aggregation, although nothing is known about their mechanism of inhibition. In this work, we deal with an extensive computational study on the inhibitory effects of these inhibitors by using an all-atom molecular dynamics simulation to interpret the underlying mechanism of their inhibitory processes. A series of investigations is carried out while studying the various structural and conformational changes of the peptide chains in the absence and presence of inhibitors. To investigate the details of the interactions between the peptide residues and inhibitors, nonbonding energy calculations, the radial distribution function, the coordination number of water and inhibitor molecules around the peptide residues, and hydrogen-bonding interactions are calculated. The potential of mean force (PMF) is calculated to estimate aggregate formation from their free-energy profiles. It is seen that the hydrophobic core of the KLVFFAE undergoes aggregation and that these inhibitors show great promise in preventing the onset of AD in the future by preventing Aβ aggregation. Also, the translocation studies on these inhibitors through a model POPC lipid bilayer shed light on their permeation properties and biocompatibility.
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Affiliation(s)
- Triasha Pal
- Department of Chemistry, Indian Institute of Technology, Guwahati, Assam, India 781039
| | - Rabindranath Paul
- Department of Chemistry, Indian Institute of Technology, Guwahati, Assam, India 781039
| | - Sandip Paul
- Department of Chemistry, Indian Institute of Technology, Guwahati, Assam, India 781039
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Pal S, Roy R, Paul S. Deciphering the Role of ATP on PHF6 Aggregation. J Phys Chem B 2022; 126:4761-4775. [PMID: 35759245 DOI: 10.1021/acs.jpcb.2c01768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The aggregation of Tau protein, which are involved in Alzheimer's disease, are associated with the self-assembly of the hexapeptide sequence, paired helical filament 6 (PHF6) from repeat 3 of Tau. In order to treat Alzheimer's disease and other such tauopathies, one of the therapeutic strategies is to inhibit aggregation of Tau and its nucleating segments. Therefore, we have studied the effect of adenosine triphosphate (ATP) on the aggregation of PHF6. ATP has, interestingly, demonstrated its ability to inhibit and dissolve protein aggregates. Using classical molecular dynamics simulations, we observed that the hydrophobic core of PHF6 segment displays extended β-sheet conformation, which stabilizes PHF6 aggregates. However, the distribution of ATP around the vicinity of the peptides enables PHF6 to remain discrete and attain random coil conformers. The interpeptide interactions are substituted by PHF6-ATP interactions through hydrogen bonding and hydrophobic interactions (including π-π stacking). Furthermore, the adenosine moiety of ATP contributes more than the triphosphate chain toward PHF6-ATP interaction. Ultimately, this work establishes the inhibitory activity of ATP against Tau aggregation; hence, the therapeutic effect of ATP should be explored further in regard to the effective treatment of Alzheimer's disease.
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Affiliation(s)
- Saikat Pal
- Department of Chemistry, Indian Institute of Technology, Guwahati, Assam 781039, India
| | - Rituparna Roy
- Department of Chemistry, Indian Institute of Technology, Guwahati, Assam 781039, India
| | - Sandip Paul
- Department of Chemistry, Indian Institute of Technology, Guwahati, Assam 781039, India
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Paul R, Bera S, Devi M, Paul S. Inhibition of Aβ 16–22 Peptide Aggregation by Small Molecules and Their Permeation through POPC Lipid Bilayer: Insight from Molecular Dynamics Simulation Study. J Chem Inf Model 2022; 62:5193-5207. [DOI: 10.1021/acs.jcim.1c01366] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Rabindranath Paul
- Department of Chemistry, Indian Institute of Technology, Guwahati, Assam, India 781039
| | - Siddhartha Bera
- Department of Chemistry, Indian Institute of Technology, Guwahati, Assam, India 781039
| | - Madhusmita Devi
- Department of Chemistry, Indian Institute of Technology, Guwahati, Assam, India 781039
| | - Sandip Paul
- Department of Chemistry, Indian Institute of Technology, Guwahati, Assam, India 781039
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Paul R, Mitra A, Paul S. A computational approach on the stereoselective binding of peptides from aqueous medium with endo-functionalized molecular tubes. Phys Chem Chem Phys 2021; 23:22703-22717. [PMID: 34605508 DOI: 10.1039/d1cp02288a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The need to obtain enantiomerically pure isomers of amino acids and peptides is often realized in the field of biology and in the pharmaceutical industry. Research is underway to devise simple methods for the chiral resolution of amino acids from their racemic mixtures. Inspired by this objective, in our present work, we have computationally shown the possibility of chiral separation of the enantiomeric pairs of two model peptides, namely, (D,L)-aspargine and (D,L)-phenylalanine, in the presence of water. For this purpose, we have used two synthetic supramolecular receptors named host-1a and host-1b, respectively. Molecular dynamics simulations and quantum chemical methods are employed to analyze the structural features and the energy aspects involved in the separation process. The information obtained at the molecular level helps us gain better insights into the key interactions that operate to produce such enantioselectivity. We have also investigated the dynamics and changes in the water structure in the vicinity of the host molecules, both in the presence and absence of the model peptides. The D- and L-isomers of the same peptide undergo complexation with a particular host molecule registering a difference of more than 1.5 kcal mol-1 (obtained from PMF and MM-PBSA analyses) in their respective energies. This indicates that the chiral separation of the peptides with the help of these endo-fuctionalized molecular tube receptors may be energetically feasible. The connection between the peptide stereochemistry and its interaction with the endo-functionalized hosts would be instrumental in designing novel segregation techniques that can be further extended to separate larger model peptides or proteins.
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Affiliation(s)
- Rabindranath Paul
- Department of Chemistry, Indian Institute of Technology, Guwahati, Assam 781039, India.
| | - Aritra Mitra
- Department of Chemistry, Indian Institute of Technology, Guwahati, Assam 781039, India.
| | - Sandip Paul
- Department of Chemistry, Indian Institute of Technology, Guwahati, Assam 781039, India.
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Abstract
Caffeine is not only a widely consumed active stimulant, but it is also a model molecule commonly used in pharmaceutical sciences. In this work, by performing quartz-crystal microbalance and neutron reflectometry experiments we investigate the interaction of caffeine molecules with a model lipid membrane. We determined that caffeine molecules are not able to spontaneously partition from an aqueous environment, enriched in caffeine, into a bilayer. Caffeine could be however included in solid-supported lipid bilayers if present with lipids during self-assembly. In this case, thanks to surface-sensitive techniques, we determined that caffeine molecules are preferentially located in the hydrophobic region of the membrane. These results are highly relevant for the development of new drug delivery vectors, as well as for a deeper understanding of the membrane permeation role of purine molecules.
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Affiliation(s)
- Letizia Tavagnacco
- CNR-ISC and Department of Physics, Sapienza University of Rome, Piazzale A. Moro 2, 00185 Rome, Italy
| | - Giacomo Corucci
- Institut Laue-Langevin, 71 avenue des Martyrs, 38000 Grenoble, France
| | - Yuri Gerelli
- Department of Life and Environmental Sciences, Marche Polytechnic University, Via Brecce Bianche, 60121 Ancona, Italy
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Paul R, Paul S. Exploration on the drug solubility enhancement in aqueous medium with the help of endo-functionalized molecular tubes: a computational approach. Phys Chem Chem Phys 2021; 23:18999-19010. [PMID: 34612438 DOI: 10.1039/d1cp01187a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
One major problem in the pharmaceutical industry is the aqueous solubility of newly developed orally administered drug candidates. More than 50% of newly developed drug molecules suffer from low aqueous solubility. The therapeutic effects of drug molecules are majorly dependent on the bioavailability and, in essence, on the solubility of the used drug molecules. Thus, enhancement of drug solubility of sparingly soluble drug molecules is a need of modern times. Considering the high importance of drug solubility, we have computationally shown the enhancement of drug solubility for seven class II (poorly water-soluble) drug molecules in a water medium. The uses of supramolecular macrocycles have immense importance in the same field. Thus, we have used two synthetic supramolecular receptors named host-1a and host-1b to enhance the water solubility of fluorouracil, albendazole, camptothecin, clopidogrel, indomethacin, melphalan, and tolfenamic acid drug molecules. Biomedical engagements of a supramolecular receptor commence with the formation of stable host-drug complexes. These complexations enhance the water solubility of drug molecules and sustain the release rate and bioavailability of drug molecules. Thus, in this work, we focus on the formation of stable host-drug complexes in water medium. Molecular dynamics simulation is applied to analyze the structural features and the energetics involved in the host-drug complexation process. The information obtained at the atomistic level helps us gain better insights into the key interactions that operate to produce such highly stable complexes. Thus, we can propose that these two supramolecular receptors may be used as drug solubilizing agents, and patients will benefit from this theragnostic application shortly.
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Affiliation(s)
- Rabindranath Paul
- Department of Chemistry, Indian Institute of Technology, Guwahati, Assam 781039, India.
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Potential of Caffeine in Alzheimer's Disease-A Review of Experimental Studies. Nutrients 2021; 13:nu13020537. [PMID: 33562156 PMCID: PMC7915779 DOI: 10.3390/nu13020537] [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: 12/31/2020] [Revised: 01/29/2021] [Accepted: 02/02/2021] [Indexed: 02/08/2023] Open
Abstract
Alzheimer's disease (AD) is the most common type of dementia leading to progressive memory loss and cognitive impairment. Considering that pharmacological treatment options for AD are few and not satisfactory, increasing attention is being paid to dietary components that may affect the development of the disease. Such a dietary component may be caffeine contained in coffee, tea or energy drinks. Although epidemiological data suggest that caffeine intake may counteract the development of cognitive impairment, results of those studies are not conclusive. The aim of the present study is to review the existing experimental studies on the efficacy of caffeine against AD and AD-related cognitive impairment, focusing on the proposed protective mechanisms of action. In conclusion, the reports of studies on experimental AD models generally supported the notion that caffeine may exert some beneficial effects in AD. However, further studies are necessary to elucidate the role of caffeine in the effects of its sources on cognition and possibly AD risk.
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Paul S, Kumari K, Paul S. Molecular Insight into the Effects of Enhanced Hydrophobicity on Amyloid-like Aggregation. J Phys Chem B 2020; 124:10048-10061. [PMID: 33115237 DOI: 10.1021/acs.jpcb.0c06000] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Generally, hydrophobic amino acids provide hydrophobic interactions during peptide aggregation. However, besides the hydrophobic amino acids, some hydrophilic amino acids, such as glutamine, are also considered to be essential elements in many self-aggregating peptides. For example, huntingtin contains polyglutamine at its N-terminus and the yeast prion Sup35 protein has the GNNQQNY sequence, a peptide well-known for its ability for amyloid fibril formation. However, despite the frequent emergence of glutamine in self-assembling systems, the molecular mechanism of amyloid formation involving this unique amino acid has not been well documented. It is still not clear how this hydrophilic amino acid is responsible for the hydrophobic interaction in the self-association process. Therefore, in this study, we have carried out classical molecular dynamics simulations of the GNNQQNY peptide and its derivatives in pure water. We quantify the propensity for the formation of β-sheet conformation with an increasing glutamine number in the peptide sequence. In addition, we assess the importance of the hydrophobicity of the dimethanediyl group present in glutamine (as well as in glutamic acid) for the self-association of the peptides through nonpolar solvent medium simulations.
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Affiliation(s)
- Srijita Paul
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Komal Kumari
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Sandip Paul
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
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14
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Dasari S, Mallik BS. Ion-induced free energy landscapes of Aβ33–42 peptide dimer in wet ionic liquids. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.114026] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Gastaldo IP, Himbert S, Ram U, Rheinstädter MC. The Effects of Resveratrol, Caffeine, β-Carotene, and Epigallocatechin Gallate (EGCG) on Amyloid- β 25 -- 35 Aggregation in Synthetic Brain Membranes. Mol Nutr Food Res 2020; 64:e2000632. [PMID: 32981185 DOI: 10.1002/mnfr.202000632] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Indexed: 01/08/2023]
Abstract
SCOPE Alzheimer's disease is a neurodegenerative condition marked by the formation and aggregation of amyloid-β (Aβ) peptides. There exists, to this day, no cure or effective prevention for the disease; however, there is evidence that a healthy diet and certain food products can slow down first occurrence and progression. To investigate if food ingredients can interact with peptide aggregates, synthetic membranes that contained aggregates consisting of cross-β sheets of the membrane active fragment A β 25 -- 35 are prepared. METHODS AND RESULTS The impact of resveratrol, found in grapes, caffeine, the main active ingredient in coffee, β-carotene, found in orange fruits and vegetables, and epigallocatechin gallate (EGCG), a component of green tea, on the size and volume fraction of Aβ aggregates is studied using optical and fluorescence microscopy, X-ray diffraction, UV-vis spectroscopy, and molecular dynamics simulations. All compounds are membrane active and spontaneously partitioned in the synthetic brain membranes. While resveratrol and caffeine lead to membrane thickening and reduced membrane fluidity, β-carotene and EGCG preserve or increase fluidity. CONCLUSION Resveratrol and caffeine do not reduce the volume fraction of peptide aggregates while β-carotene significantly reduces plaque size. Interestingly, EGCG dissolves peptide aggregates and significantly decreases the corresponding cross-β and β-sheet signals.
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Affiliation(s)
- Isabella P Gastaldo
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, L8S 4M1, Canada.,Origins Institute, McMaster University, Hamilton, Ontario, L8S 4M1, Canada.,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, L8S 4M1, Canada
| | - Sebastian Himbert
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, L8S 4M1, Canada.,Origins Institute, McMaster University, Hamilton, Ontario, L8S 4M1, Canada
| | - Udbhav Ram
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, L8S 4M1, Canada.,Origins Institute, McMaster University, Hamilton, Ontario, L8S 4M1, Canada
| | - Maikel C Rheinstädter
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, L8S 4M1, Canada.,Origins Institute, McMaster University, Hamilton, Ontario, L8S 4M1, Canada
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Giri RS, Pal S, Roy S, Dolai G, Manne SR, Paul S, Mandal B. Nanostructures from protected L/L and D/L amino acid containing dipeptides. Pept Sci (Hoboken) 2020. [DOI: 10.1002/pep2.24176] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Rajat Subhra Giri
- Department of Chemistry, Laboratory of Peptide and Amyloid Research Indian Institute of Technology Guwahati Guwahati India
| | - Saikat Pal
- Department of Chemistry Indian Institute of Technology Guwahati Guwahati India
| | - Sayanta Roy
- Department of Chemistry, Laboratory of Peptide and Amyloid Research Indian Institute of Technology Guwahati Guwahati India
| | - Gobinda Dolai
- Department of Chemistry, Laboratory of Peptide and Amyloid Research Indian Institute of Technology Guwahati Guwahati India
| | - Srinivasa Rao Manne
- Department of Chemistry, Laboratory of Peptide and Amyloid Research Indian Institute of Technology Guwahati Guwahati India
| | - Sandip Paul
- Department of Chemistry Indian Institute of Technology Guwahati Guwahati India
| | - Bhubaneswar Mandal
- Department of Chemistry, Laboratory of Peptide and Amyloid Research Indian Institute of Technology Guwahati Guwahati India
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17
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Man VH, He X, Ji B, Liu S, Xie XQ, Wang J. Introducing Virtual Oligomerization Inhibition to Identify Potent Inhibitors of Aβ Oligomerization. J Chem Theory Comput 2020; 16:3920-3935. [PMID: 32307994 DOI: 10.1021/acs.jctc.0c00185] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Amyloid-β (Aβ) oligomers are known as the most toxic form of Aβ peptides, and they are a major contributor to Alzheimer's disease. Therefore, developing antagonist screening methods for the formation of Aβ oligomers is urgent and of great interest. In this study, we introduce virtual oligomerization inhibition (VOI), a novel virtual screening protocol that applies atomistic simulation to quantitatively investigate the ability of a ligand in interfering Aβ oligomerization and the formation of Aβ oligomers. Results from the VOI performance on six known inhibitors of Aβ aggregation (brazilin, curcumin, EGCG, ELND005, resveratrol, and tacrine) are in excellent agreement with the results of expensive experiments. Moreover, VOI can reveal the mechanism and kinetics of the inhibition process at the atomistic level. VOI not only improves the efficiency of the antagonist screening for Aβ oligomerization but also reduces the cost of performing the task. Attractively, the principle of VOI can also be applied to inhibitor screening for the aggregation of other amyloid proteins/peptides.
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Affiliation(s)
- Viet Hoang Man
- Department of Pharmaceutical Sciences and Computational Chemical Genomics Screening Center, School of Pharmacy, and NIDA National Center of Excellence for Computational Drug Abuse Research, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
| | - Xibing He
- Department of Pharmaceutical Sciences and Computational Chemical Genomics Screening Center, School of Pharmacy, and NIDA National Center of Excellence for Computational Drug Abuse Research, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
| | - Beihong Ji
- Department of Pharmaceutical Sciences and Computational Chemical Genomics Screening Center, School of Pharmacy, and NIDA National Center of Excellence for Computational Drug Abuse Research, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
| | - Shuhan Liu
- Department of Pharmaceutical Sciences and Computational Chemical Genomics Screening Center, School of Pharmacy, and NIDA National Center of Excellence for Computational Drug Abuse Research, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
| | - Xiang-Qun Xie
- Department of Pharmaceutical Sciences and Computational Chemical Genomics Screening Center, School of Pharmacy, and NIDA National Center of Excellence for Computational Drug Abuse Research, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
| | - Junmei Wang
- Department of Pharmaceutical Sciences and Computational Chemical Genomics Screening Center, School of Pharmacy, and NIDA National Center of Excellence for Computational Drug Abuse Research, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
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18
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Coffee extracts effectively inhibit the formation of α-chymotrypsin amyloid-like fibrils in aqueous ethanol in vitro. Biol Futur 2020; 71:147-152. [PMID: 34554524 DOI: 10.1007/s42977-020-00006-8] [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: 08/09/2019] [Accepted: 03/09/2020] [Indexed: 10/24/2022]
Abstract
In this study, an in vitro α-chymotrypsin aggregation model was used to demonstrate that certain extracts of commercial coffees effectively inhibit protein aggregation in 55% ethanol at pH 7.0. To detect the anti-amyloidogenic effect of the various coffee extracts, turbidity measurements and Congo red binding assays were performed as well as the determination of the total polyphenol content of the extracts. The greatest fibril formation inhibitory effect was exerted by the Eduscho coffee extract, which contained also the most of the phenolic compounds. The Eduscho coffee extract inhibited the fibrillation of the α-chymotrypsin dose dependently. Coffee extracts are effective anti-aggregation agents, and their beneficial effects strongly correlate with the total phenolic content.
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Minh Hung H, Nguyen MT, Tran PT, Truong VK, Chapman J, Quynh Anh LH, Derreumaux P, Vu VV, Ngo ST. Impact of the Astaxanthin, Betanin, and EGCG Compounds on Small Oligomers of Amyloid Aβ 40 Peptide. J Chem Inf Model 2020; 60:1399-1408. [PMID: 32105466 DOI: 10.1021/acs.jcim.9b01074] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
There is experimental evidence that the astaxanthin, betanin, and epigallocatechin-3-gallate (EGCG) compounds slow down the aggregation kinetics and the toxicity of the amyloid-β (Aβ) peptide. How these inhibitors affect the self-assembly at the atomic level remains elusive. To address this issue, we have performed for each ligand atomistic replica exchange molecular dynamic (REMD) simulations in an explicit solvent of the Aβ11-40 trimer from the U-shape conformation and MD simulations starting from Aβ1-40 dimer and tetramer structures characterized by different intra- and interpeptide conformations. We find that the three ligands have similar binding free energies on small Aβ40 oligomers but very distinct transient binding sites that will affect the aggregation of larger assemblies and fibril elongation of the Aβ40 peptide.
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Affiliation(s)
- Huynh Minh Hung
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium
| | - Minh Tho Nguyen
- Computational Chemistry Research Group, Ton Duc Thang University, Ho Chi Minh City 700000, Vietnam
| | - Phuong-Thao Tran
- Department of Pharmaceutical Chemistry, Hanoi University of Pharmacy, Hanoi 100000, Vietnam
| | - Vi Khanh Truong
- School of Science, RMIT University, GPO Box 2476, Melbourne 3001, Australia
| | - James Chapman
- School of Science, RMIT University, GPO Box 2476, Melbourne 3001, Australia
| | - Le Huu Quynh Anh
- Department of Climate Change and Renewable Energy, Ho Chi Minh City University of Natural Resources and Environment, Ho Chi Minh City 700000, Vietnam
| | - Philippe Derreumaux
- Laboratory of Theoretical Chemistry, Ton Duc Thang University, Ho Chi Minh City 700000, Vietnam.,Faculty of Pharmacy, Ton Duc Thang University, Ho Chi Minh City 700000, Vietnam.,Laboratoire de Biochimie Théorique, UPR9080, CNRS, Université de Paris, 13 rue Pierre et Marie Curie, F-75005 Paris, France.,Institut de Biologie Physico-Chimique-Fondation Edmond de Rothschild, PSL Research University, 75005 Paris, France
| | - Van V Vu
- NTT Hi-Tech Institute, Nguyen Tat Thanh University, Ho Chi Minh City 700000, Vietnam
| | - Son Tung Ngo
- Laboratory of Theoretical and Computational Biophysics, Ton Duc Thang University, Ho Chi Minh City 700000, Vietnam.,Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City 700000, Vietnam
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20
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Ma L, Yang C, Zheng J, Chen Y, Xiao Y, Huang K. Non-polyphenolic natural inhibitors of amyloid aggregation. Eur J Med Chem 2020; 192:112197. [PMID: 32172082 DOI: 10.1016/j.ejmech.2020.112197] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2019] [Revised: 02/09/2020] [Accepted: 02/28/2020] [Indexed: 02/07/2023]
Abstract
Protein misfolding diseases (PMDs) are chronic and progressive, with no effective therapy so far. Aggregation and misfolding of amyloidogenic proteins are closely associated with the onset and progression of PMDs, such as amyloid-β (Aβ) in Alzheimer's disease, α-Synuclein (α-Syn) in Parkinson's disease and human islet amyloid polypeptide (hIAPP) in type 2 diabetes. Inhibiting toxic aggregation of amyloidogenic proteins is regarded as a promising therapeutic approach in PMDs. The past decade has witnessed the rapid progresses of this field, dozens of inhibitors have been screened and verified in vitro and in vivo, demonstrating inhibitory effects against the aggregation and misfolding of amyloidogenic proteins, together with beneficial effects. Natural products are major sources of small molecule amyloid inhibitors, a number of natural derived compounds have been identified with great bioactivities and translational prospects. Here, we review the non-polyphenolic natural inhibitors that potentially applicable for PMDs treatment, along with their working mechanisms. Future directions are proposed for the development and clinical applications of these inhibitors.
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Affiliation(s)
- Liang Ma
- Affiliated Wuhan Mental Health Center, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China
| | - Chen Yang
- Tongji School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China
| | - Jiaojiao Zheng
- Tongji School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China
| | - Yuchen Chen
- Tongji School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China
| | - Yushuo Xiao
- College of Pharmacy, Hubei University of Chinese Medicine, Wuhan, 430035, China
| | - Kun Huang
- Tongji School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China.
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21
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Sorout N, Chandra A. Effects of Boron Nitride Nanotube on the Secondary Structure of Aβ(1–42) Trimer: Possible Inhibitory Effect on Amyloid Formation. J Phys Chem B 2020; 124:1928-1940. [DOI: 10.1021/acs.jpcb.9b11986] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Nidhi Sorout
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Amalendu Chandra
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India
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22
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Dasari S, Mallik BS. Conformational dynamics of amyloid-β (16–22) peptide in aqueous ionic liquids. RSC Adv 2020; 10:33248-33260. [PMID: 35515066 PMCID: PMC9056671 DOI: 10.1039/d0ra06609e] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Accepted: 09/01/2020] [Indexed: 12/04/2022] Open
Abstract
Molecular dynamics simulations of amyloid-β (16–22) peptide dimer in water as well as at two different experimentally studied concentrations of hydrated ionic liquids (ILs), ethylammonium mesylate (EAM), ethylammonium nitrate (EAN), and triethylammonium mesylate (TEAM), were carried out employing an umbrella sampling method. We used the average Ψ angle of the peptide backbone as the reaction coordinate to observe the conformational changes of a peptide dimer. Secondary structural element values were calculated for the peptide dimer along the reaction coordinate to see the transition of the peptide dimer between β-sheet and α-helix conformations. We observe the β-sheet conformation as the global minimum on the free energy surfaces in both EAM and EAN ILs at both the concentrations and at a low concentration of TEAM. However, we observe α-helix conformation as the global minimum at a high concentration of TEAM. Our results are in good correlation with the experimental findings. We calculated the average number of intramolecular and intermolecular hydrogen bonds of α-helix and β-sheet conformations in all solutions, and they are in correlation with the secondary structure element values. To understand the peptide–IL interactions, atom–atom radial distribution functions of cation, anion, and water around amide oxygen and hydrogen atoms were calculated. The solvent-accessible surface area of the peptide dimer was calculated to understand the exposure of the peptide towards the solvent during conformational changes. Finally, van der Waals (vdW) and Coulomb interaction energies were calculated between peptide–cation, peptide–anion, and peptide–water to understand the stability of conformations in different concentrations. We find that the TEA cation has more vdW interaction energy compared to Coulomb interaction energy with peptide in 70% (w/w) TEAM, which mimics a membrane-like environment to induce α-helix conformation rather than β-sheet conformation. Molecular dynamics simulations of amyloid-β (16–22) peptide dimer at two different experimentally studied concentrations of hydrated ethylammonium mesylate, ethylammonium nitrate, and triethylammonium mesylate were carried out employing an umbrella sampling method.![]()
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Affiliation(s)
- Sathish Dasari
- Department of Chemistry
- Indian Institute of Technology Hyderabad
- Sangareddy-502285
- India
| | - Bhabani S. Mallik
- Department of Chemistry
- Indian Institute of Technology Hyderabad
- Sangareddy-502285
- India
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23
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Abstract
The oligomerization of Aβ16-22 peptide, which is the hydrophobic core region of full-length Aβ1-42, causes Alzheimer's disease (AD). This progressive neurodegenerative disease affects over 44 million people worldwide. However, very few synthesized drug molecules are available to inhibit the aggregation of Aβ. Recently, experimental studies have shown that the biological ATP molecule prevents Aβ fibrillation at the millimolar scale; however, the significance of ATP molecules on Aβ fibrillation and the mechanism behind it remain elusive. We have carried out a total of 7.5 μs extensive all-atom molecular dynamics and 8.82 μs of umbrella sampling in explicit water using AMBER14SB, AMBER99SB-ILDN, and AMBER-FB15 force fields for Aβ16-22 peptide, to investigate the role of ATP on the disruption of Aβ16-22 prefibrils. From various analyses, such as secondary structure analysis, residue-wise contact map, SASA, and interaction energies, we have observed that, in the presence of ATP, the aggregation of Aβ16-22 peptide is very unfavorable. Moreover, the biological molecule ATP interacts with the Aβ16-22 peptide via hydrogen bonding, π-π stacking, and NH-π interactions which, ultimately, prevent the aggregation of Aβ16-22 peptide. Hence, we assume that the deficiency of ATP may cause Alzheimer's disease (AD).
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Affiliation(s)
- Saikat Pal
- Department of Chemistry , Indian Institute of Technology , Guwahati , Assam 781039 , India
| | - Sandip Paul
- Department of Chemistry , Indian Institute of Technology , Guwahati , Assam 781039 , India
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24
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Janitschke D, Nelke C, Lauer AA, Regner L, Winkler J, Thiel A, Grimm HS, Hartmann T, Grimm MOW. Effect of Caffeine and Other Methylxanthines on Aβ-Homeostasis in SH-SY5Y Cells. Biomolecules 2019; 9:E689. [PMID: 31684105 PMCID: PMC6920871 DOI: 10.3390/biom9110689] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2019] [Revised: 10/25/2019] [Accepted: 10/30/2019] [Indexed: 02/07/2023] Open
Abstract
Methylxanthines (MTX) are alkaloids derived from the purine-base xanthine. Whereas especially caffeine, the most prominent known MTX, has been formerly assessed to be detrimental, this point of view has changed substantially. MTXs are discussed to have beneficial properties in neurodegenerative diseases, however, the mechanisms of action are not completely understood. Here we investigate the effect of the naturally occurring caffeine, theobromine and theophylline and the synthetic propentofylline and pentoxifylline on processes involved in Alzheimer's disease (AD). All MTXs decreased amyloid-β (Aβ) level by shifting the amyloid precursor protein (APP) processing from the Aβ-producing amyloidogenic to the non-amyloidogenic pathway. The α-secretase activity was elevated whereas β-secretase activity was decreased. Breaking down the molecular mechanism, caffeine increased protein stability of the major α-secretase ADAM10, downregulated BACE1 expression and directly decreased β-secretase activity. Additionally, APP expression was reduced. In line with literature, MTXs reduced oxidative stress, decreased cholesterol and a decreased in Aβ1-42 aggregation. In conclusion, all MTXs act via the pleiotropic mechanism resulting in decreased Aβ and show beneficial properties with respect to AD in neuroblastoma cells. However, the observed effect strength was moderate, suggesting that MTXs should be integrated in a healthy diet rather than be used exclusively to treat or prevent AD.
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Affiliation(s)
- Daniel Janitschke
- Experimental Neurology, Saarland University, 66424 Homburg/Saar, Germany.
| | - Christopher Nelke
- Experimental Neurology, Saarland University, 66424 Homburg/Saar, Germany.
| | - Anna Andrea Lauer
- Experimental Neurology, Saarland University, 66424 Homburg/Saar, Germany.
| | - Liesa Regner
- Experimental Neurology, Saarland University, 66424 Homburg/Saar, Germany.
| | - Jakob Winkler
- Experimental Neurology, Saarland University, 66424 Homburg/Saar, Germany.
| | - Andrea Thiel
- Experimental Neurology, Saarland University, 66424 Homburg/Saar, Germany.
| | - Heike Sabine Grimm
- Experimental Neurology, Saarland University, 66424 Homburg/Saar, Germany.
| | - Tobias Hartmann
- Experimental Neurology, Saarland University, 66424 Homburg/Saar, Germany.
- Deutsches Institut für DemenzPrävention (DIDP), Saarland University, 66424 Homburg/Saar, Germany.
| | - Marcus Otto Walter Grimm
- Experimental Neurology, Saarland University, 66424 Homburg/Saar, Germany.
- Deutsches Institut für DemenzPrävention (DIDP), Saarland University, 66424 Homburg/Saar, Germany.
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25
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Paul S, Paul S. Molecular dynamics simulation study on the inhibitory effects of choline-O-sulfate on hIAPP protofibrilation. J Comput Chem 2019; 40:1957-1968. [PMID: 31062393 DOI: 10.1002/jcc.25851] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2019] [Revised: 04/10/2019] [Accepted: 04/16/2019] [Indexed: 11/06/2022]
Abstract
Type 2 diabetes mellitus (T2Dm) is a neurodegenerative disease, which occurs due to the self-association of human islet amyloid polypeptide (hIAPP), also known as human amylin. It was reported experimentally that choline-O-sulfate (COS), a small organic molecule having a tertiary amino group and sulfate group, can prevent the aggregation of human amylin without providing the mechanism of the action of COS in the inhibition process. In this work, we investigate the influence of COS on the full-length hIAPP peptide by performing 500 ns classical molecular dynamics simulations. From pure water simulation (without COS), we have identified the residues 11-20 and 23-36 that mainly participate in the fibril formation, but in the presence of 1.07 M COS these residues become totally free of β-sheet conformation. Our results also show that the sulfate oxygen of COS directly interacts with the peptide backbone, which leads to the local disruption of peptide-peptide interaction. Moreover, the presence of favorable peptide-COS vdW interaction energy and high coordination number of COS molecules in the first solvation shell of the peptide indicates the hydrophobic solvation of the peptide residues by COS molecules, which also play a crucial role in the prevention of β-sheet formation. Finally, from the potential of mean force (PMFs) calculations, we observe that the free energy between two peptides is more negative in the absence of COS and with increasing concentration of COS, it becomes unfavorable significantly indicating that the peptide dimer formation is most stable in pure water, which becomes less favorable in the presence of COS. © 2019 Wiley Periodicals, Inc.
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Affiliation(s)
- Srijita Paul
- Department of Chemistry, Indian Institute of Technology, Guwahati, Assam, India 781039
| | - Sandip Paul
- Department of Chemistry, Indian Institute of Technology, Guwahati, Assam, India 781039
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26
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Paul S, Paul S. Inhibitory Effect of Choline-O-sulfate on Aβ16–22 Peptide Aggregation: A Molecular Dynamics Simulation Study. J Phys Chem B 2019; 123:3475-3489. [DOI: 10.1021/acs.jpcb.9b02727] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Srijita Paul
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam, India 781039
| | - Sandip Paul
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam, India 781039
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27
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Xu J, Wang K, Yuan Y, Li H, Zhang R, Guan S, Wang L. A Novel Peroxidase Mimics and Ameliorates Alzheimer's Disease-Related Pathology and Cognitive Decline in Mice. Int J Mol Sci 2018; 19:ijms19113304. [PMID: 30352982 PMCID: PMC6274722 DOI: 10.3390/ijms19113304] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2018] [Revised: 10/14/2018] [Accepted: 10/19/2018] [Indexed: 02/07/2023] Open
Abstract
Alzheimer's disease (AD) is the most common neurodegenerative disorder in the elderly, which is characterized by the accumulation of amyloid β (Aβ) plaques, oxidative stress, and neuronal loss. Therefore, clearing Aβ aggregates and reducing oxidative stress could be an effective therapeutic strategy for AD. Deuterohemin-AlaHisThrValGluLys (DhHP-6), a novel deuterohemin-containing peptide mimetic of the natural microperoxidase-11 (MP-11), shows higher antioxidant activity and stability compared to the natural microperoxidases. DhHP-6 possesses the ability of extending lifespan and alleviating paralysis in the Aβ1-42 transgenic Caenorhabditis elegans CL4176 model of AD, as shown in our previous study. Therefore, this study was aimed at exploring the neuroprotective effect of DhHP-6 in the APPswe/PSEN1dE9 transgenic mouse model of AD. DhHP-6 reduced the diameter and fiber structure of Aβ1-42 aggregation in vitro, as shown by dynamic light scattering and transmission electron microscope. DhHP-6 exerted its neuroprotective effect by inhibiting Aβ aggregation and plaque formation, and by reducing Aβ1-42 oligomers-induced neurotoxicity on HT22 (mouse hippocampal neuronal) and SH-SY5Y (human neuroblastoma) cells. In the AD mouse model, DhHP-6 significantly ameliorated cognitive decline and improved spatial learning ability in behavioral tests including the Morris water maze, Y-maze, novel object recognition, open field, and nest-building test. Moreover, DhHP-6 reduced the deposition of Aβ plaques in the cerebral cortex and hippocampus. More importantly, DhHP-6 restored the morphology of astrocytes and microglia, and significantly reduced the levels of pro-inflammatory cytokines. Our findings provide a basis for considering the non-toxic, peroxidase mimetic DhHP-6 as a new candidate drug against AD.
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Affiliation(s)
- Jia Xu
- School of Life Sciences, Jilin University, Changchun 130012, China.
| | - Kai Wang
- School of Life Sciences, Jilin University, Changchun 130012, China.
| | - Ye Yuan
- School of Life Sciences, Jilin University, Changchun 130012, China.
| | - Hui Li
- School of Life Sciences, Jilin University, Changchun 130012, China.
| | - Ruining Zhang
- School of Life Sciences, Jilin University, Changchun 130012, China.
| | - Shuwen Guan
- School of Life Sciences, Jilin University, Changchun 130012, China.
- Engineering Laboratory for AIDS Vaccine, Jilin University, Changchun 130012, China.
- Key Laboratory for Molecular Enzymology and Engineering, the Ministry of Education, Jilin Universtiy, Changchun 130012, China.
| | - Liping Wang
- School of Life Sciences, Jilin University, Changchun 130012, China.
- Engineering Laboratory for AIDS Vaccine, Jilin University, Changchun 130012, China.
- Key Laboratory for Molecular Enzymology and Engineering, the Ministry of Education, Jilin Universtiy, Changchun 130012, China.
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28
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Mancini RS, Wang Y, Weaver DF. Phenylindanes in Brewed Coffee Inhibit Amyloid-Beta and Tau Aggregation. Front Neurosci 2018; 12:735. [PMID: 30369868 PMCID: PMC6194148 DOI: 10.3389/fnins.2018.00735] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Accepted: 09/24/2018] [Indexed: 12/12/2022] Open
Abstract
Coffee consumption has been correlated with a decreased risk of developing Alzheimer's disease (AD) and Parkinson's disease (PD), but the mechanism by which coffee may provide neuroprotection in humans is not fully understood. We hypothesized that compounds found in brewed coffee may elicit neuroprotective effects by inhibiting the aggregation of amyloid-beta (Aβ) and tau (AD) or α-synuclein (PD). Three instant coffee extracts (light roast, dark roast, decaffeinated dark roast) and six coffee components [caffeine (1), chlorogenic acid (2), quinic acid (3), caffeic acid (4), quercetin (5), and phenylindane (6)] were investigated for their ability to inhibit the fibrillization of Aβ and tau proteins using thioflavin T (ThT) and thioflavin S (ThS) fluorescence assays, respectively. Inhibition of Aβ and α-synuclein oligomerization was assessed using ELISA assays. All instant coffee extracts inhibit fibrillization of Aβ and tau, and promote α-synuclein oligomerization at concentrations above 100 μg/mL. Dark roast coffee extracts are more potent inhibitors of Aβ oligomerization (IC50 ca. 10 μg/mL) than light roast coffee extract (IC50 = 40.3 μg/mL), and pure caffeine (1) has no effect on Aβ, tau or α-synuclein aggregation. Coffee components 2, 4, and 5 inhibit the fibrillization of Aβ at 100 μM concentration, yet only 5 inhibits Aβ oligomerization (IC50 = 10.3 μM). 1-5 have no effect on tau fibrillization. Coffee component 6, however, is a potent inhibitor of both Aβ and tau fibrillization, and also inhibits Aβ oligomerization (IC50 = 42.1 μM). Coffee components 4 and 5 promote the aggregation of α-synuclein at concentrations above 100 μM; no other coffee components affect α-synuclein oligomerization. While the neuroprotective effect of coffee consumption is likely due to a combination of factors, our data suggest that inhibition Aβ and tau aggregation by phenylindane 6 (formed during the roasting of coffee beans, higher quantities found in dark roast coffees) is a plausible mechanism by which coffee may provide neuroprotection. The identification of 6 as a dual-inhibitor of both Aβ and tau aggregation is noteworthy, and to our knowledge this is the first report of the aggregation inhibition activity of 6.
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Affiliation(s)
- Ross S. Mancini
- Department of Fundamental Neurobiology, Krembil Research Institute, University Health Network, Toronto, ON, Canada
| | - Yanfei Wang
- Department of Fundamental Neurobiology, Krembil Research Institute, University Health Network, Toronto, ON, Canada
| | - Donald F. Weaver
- Department of Fundamental Neurobiology, Krembil Research Institute, University Health Network, Toronto, ON, Canada
- Department of Chemistry, University of Toronto, Toronto, ON, Canada
- Department of Medicine, University of Toronto, Toronto, ON, Canada
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29
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Pal S, Paul S. Conformational deviation of Thrombin binding G-quadruplex aptamer (TBA) in presence of divalent cation Sr 2+: A classical molecular dynamics simulation study. Int J Biol Macromol 2018; 121:350-363. [PMID: 30308284 DOI: 10.1016/j.ijbiomac.2018.09.102] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2018] [Revised: 08/27/2018] [Accepted: 09/17/2018] [Indexed: 11/28/2022]
Abstract
Thrombin binding TBA-G-quadruplex aptamer (TBA) plays a major role in blood coagulation cascade. The 15-mer TBA sequence tends to form four-stranded TBA-G-quadruplex structure. In this research work, a series of explicit solvent classical MD simulations of the TBA is carried out using different salt (SrCl2) concentrations (0, 50, 100 and 200 mM). Here we have also testified the effect of salt concentration of divalent cation Sr2+ on the conformational change of quadruplex DNA. The structural deviations, fluctuations, torsional angles and the affinity of the ion are explored at different salt concentrations. It is found that the conformation of TBA-G-quadruplex at 0 mM and 50 mM salt concentrations, is very much different than the other salt concentrations (100 mM and 200 mM). Also observed are as follows: (i) no exchange of Sr2+ ion between inside and outside of the channel, (ii) an enhancement in the Sr2+ ion density around the phosphate region of the loop residues as salt concentration increases and (iii) the stacking of T3 and T4 residues of loop-1 that appears up to 50 mM concentration, vanishes as the salt concentration is increased further.
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Affiliation(s)
- Saikat Pal
- Department of Chemistry, Indian Institute of Technology, Guwahati, Assam 781039, India
| | - Sandip Paul
- Department of Chemistry, Indian Institute of Technology, Guwahati, Assam 781039, India.
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30
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Etersalate prevents the formations of 6Aβ16-22 oligomer: An in silico study. PLoS One 2018; 13:e0204026. [PMID: 30226897 PMCID: PMC6143259 DOI: 10.1371/journal.pone.0204026] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Accepted: 09/01/2018] [Indexed: 11/19/2022] Open
Abstract
Oligomerization of amyloid beta (Aβ) peptides has been considered as the crucially causative agent in the development of Alzheimer's disease. Etersalate, a nonsteroidal anti-inflammatory oral drug (United State Food and Drug Administration—Unique Ingredient Identifier: 653GN04T2G) was previously suggested to bind well to proto-fibrils of Aβ peptides in silico. Here, the effect of etersalate on the oligomerization of soluble Aβ16–22 hexamer (6Aβ16–22) were extensively investigated using temperature replica exchange molecular dynamics (REMD) simulations over ~16.8 μs in total for 48 replicas (350 ns per replica). The results reveal that etersalate can enter the inner space or bind on the surface of 6Aβ16–22 conformations, which destabilizes the hexamer. Etersalate was predicted to able to cross the blood brain barrier using prediction of absorption, distribution, metabolism, and excretion—toxicity (preADMET) tools. Overall, although the investigation was performed with the low concentration of trial inhibitor, the obtained results indicate that etersalate is a potential drug candidate for AD through inhibiting formation of Aβ oligomers with the average binding free energy of -11.7 kcal/mol.
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31
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Cellai L, Carvalho K, Faivre E, Deleau A, Vieau D, Buée L, Blum D, Mériaux C, Gomez-Murcia V. The Adenosinergic Signaling: A Complex but Promising Therapeutic Target for Alzheimer's Disease. Front Neurosci 2018; 12:520. [PMID: 30123104 PMCID: PMC6085480 DOI: 10.3389/fnins.2018.00520] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Accepted: 07/11/2018] [Indexed: 01/02/2023] Open
Abstract
Alzheimer’s disease (AD) is the most common neurodegenerative disorder in elderly people. AD is characterized by a progressive cognitive decline and it is neuropathologically defined by two hallmarks: extracellular deposits of aggregated β-amyloid (Aβ) peptides and intraneuronal fibrillar aggregates of hyper- and abnormally phosphorylated Tau proteins. AD results from multiple genetic and environmental risk factors. Epidemiological studies reported beneficial effects of caffeine, a non-selective adenosine receptors antagonist. In the present review, we discuss the impact of caffeine and of adenosinergic system modulation on AD, in terms of pathology and therapeutics.
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Affiliation(s)
- Lucrezia Cellai
- Institut National de la Santé et de la Recherche Médicale, CHU Lille, UMR-S 1172-JPArc, LabEx DISTALZ, Université de Lille, Lille, France
| | - Kevin Carvalho
- Institut National de la Santé et de la Recherche Médicale, CHU Lille, UMR-S 1172-JPArc, LabEx DISTALZ, Université de Lille, Lille, France
| | - Emilie Faivre
- Institut National de la Santé et de la Recherche Médicale, CHU Lille, UMR-S 1172-JPArc, LabEx DISTALZ, Université de Lille, Lille, France
| | - Aude Deleau
- Institut National de la Santé et de la Recherche Médicale, CHU Lille, UMR-S 1172-JPArc, LabEx DISTALZ, Université de Lille, Lille, France
| | - Didier Vieau
- Institut National de la Santé et de la Recherche Médicale, CHU Lille, UMR-S 1172-JPArc, LabEx DISTALZ, Université de Lille, Lille, France
| | - Luc Buée
- Institut National de la Santé et de la Recherche Médicale, CHU Lille, UMR-S 1172-JPArc, LabEx DISTALZ, Université de Lille, Lille, France
| | - David Blum
- Institut National de la Santé et de la Recherche Médicale, CHU Lille, UMR-S 1172-JPArc, LabEx DISTALZ, Université de Lille, Lille, France
| | - Céline Mériaux
- Institut National de la Santé et de la Recherche Médicale, CHU Lille, UMR-S 1172-JPArc, LabEx DISTALZ, Université de Lille, Lille, France
| | - Victoria Gomez-Murcia
- Institut National de la Santé et de la Recherche Médicale, CHU Lille, UMR-S 1172-JPArc, LabEx DISTALZ, Université de Lille, Lille, France
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Xu J, Du K, Shen J, Shen C, Chai K, Zhang P. Copper(II)-Catalyzed Selective Para
Amination of Arylamine with Pyrazole by C−H Functionalization. ChemCatChem 2018. [DOI: 10.1002/cctc.201800328] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Jun Xu
- College of Material, Chemistry and Chemical Engineering; Hangzhou Normal University; Hangzhou 310036 China
| | - Kui Du
- College of Material, Chemistry and Chemical Engineering; Hangzhou Normal University; Hangzhou 310036 China
| | - Jiabin Shen
- College of Material, Chemistry and Chemical Engineering; Hangzhou Normal University; Hangzhou 310036 China
| | - Chao Shen
- College of Material, Chemistry and Chemical Engineering; Hangzhou Normal University; Hangzhou 310036 China
| | - Kejie Chai
- College of Material, Chemistry and Chemical Engineering; Hangzhou Normal University; Hangzhou 310036 China
| | - Pengfei Zhang
- College of Material, Chemistry and Chemical Engineering; Hangzhou Normal University; Hangzhou 310036 China
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You G, Wang K, Wang X, Wang G, Sun J, Duan G, Xia C. Visible-Light-Mediated Nickel(II)-Catalyzed C–N Cross-Coupling in Water: Green and Regioselective Access for the Synthesis of Pyrazole-Containing Compounds. Org Lett 2018; 20:4005-4009. [DOI: 10.1021/acs.orglett.8b01395] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Guirong You
- Pharmacy College, Taishan Medical University, Taian 271016, China
| | - Kai Wang
- Pharmacy College, Taishan Medical University, Taian 271016, China
| | - Xiaodan Wang
- Pharmacy College, Taishan Medical University, Taian 271016, China
| | - Guodong Wang
- Pharmacy College, Taishan Medical University, Taian 271016, China
| | - Jian Sun
- Pharmacy College, Taishan Medical University, Taian 271016, China
| | - Guiyun Duan
- Pharmacy College, Taishan Medical University, Taian 271016, China
| | - Chengcai Xia
- Pharmacy College, Taishan Medical University, Taian 271016, China
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35
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Ancilotto F, Barranco M, Coppens F, Eloranta J, Halberstadt N, Hernando A, Mateo D, Pi M. Density functional theory of doped superfluid liquid helium and nanodroplets. INT REV PHYS CHEM 2017. [DOI: 10.1080/0144235x.2017.1351672] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Francesco Ancilotto
- Dipartimento di Fisica e Astronomia ‘Galileo Galilei’ and CNISM, Università di Padova, Padova, Italy
- CNR-IOM Democritos, Trieste, Italy
| | - Manuel Barranco
- Facultat de Física, Departament FQA, Universitat de Barcelona, Barcelona, Spain
- Institute of Nanoscience and Nanotechnology (IN2UB), Universitat de Barcelona, Barcelona, Spain
- Laboratoire des Collisions, Agrégats et Réactivité, IRSAMC, Université Toulouse 3 and CNRS, Toulouse Cedex 09, France
| | - François Coppens
- Laboratoire des Collisions, Agrégats et Réactivité, IRSAMC, Université Toulouse 3 and CNRS, Toulouse Cedex 09, France
| | - Jussi Eloranta
- Department of Chemistry and Biochemistry, California State University at Northridge, Northridge, CA, USA
| | - Nadine Halberstadt
- Laboratoire des Collisions, Agrégats et Réactivité, IRSAMC, Université Toulouse 3 and CNRS, Toulouse Cedex 09, France
| | - Alberto Hernando
- Social Thermodynamics Applied Research (SThAR), EPFL Innovation Park, Lausanne, Switzerland
| | - David Mateo
- Applied Complexity Group, Singapore University of Technology and Design, Singapore, Singapore
| | - Martí Pi
- Facultat de Física, Departament FQA, Universitat de Barcelona, Barcelona, Spain
- Institute of Nanoscience and Nanotechnology (IN2UB), Universitat de Barcelona, Barcelona, Spain
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36
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Kim HY, Kwon JA, Kang T, Choi I. Rapid and high-throughput colorimetric screening for anti-aggregation reagents of protein conformational diseases by using gold nanoplasmonic particles. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2017; 13:1575-1585. [DOI: 10.1016/j.nano.2017.01.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2016] [Revised: 11/29/2016] [Accepted: 01/09/2017] [Indexed: 01/04/2023]
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37
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Lin TW, Chang CF, Chang YJ, Liao YH, Yu HM, Chen YR. Alzheimer's amyloid-β A2T variant and its N-terminal peptides inhibit amyloid-β fibrillization and rescue the induced cytotoxicity. PLoS One 2017; 12:e0174561. [PMID: 28362827 PMCID: PMC5376091 DOI: 10.1371/journal.pone.0174561] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Accepted: 03/11/2017] [Indexed: 01/21/2023] Open
Abstract
Alzheimer’s disease (AD) is the most common dementia affecting tens of million people worldwide. The primary neuropathological hallmark in AD is amyloid plaques composed of amyloid-β peptide (Aβ). Several familial mutations found in Aβ sequence result in early onset of AD. Previous studies showed that the mutations located at N-terminus of Aβ, such as the English (H6R) and Tottori (D7N) mutations, promote fibril formation and increase cytotoxicity. However, A2T mutant located at the very N-terminus of Aβ shows low-prevalence incidence of AD, whereas, another mutant A2V causes early onset of AD. To understand the molecular mechanism of the distinct effect and develop new potential therapeutic strategy, here, we examined the effect of full-length and N-terminal A2V/T variants to wild type (WT) Aβ40 by fibrillization assays and NMR studies. We found that full-length and N-terminal A2V accelerated WT fibrillization and induced large chemical shifts on the N-terminus of WT Aβ, whereas, full-length and N-terminal A2T retarded the fibrillization. We further examined the inhibition effect of various N-terminal fragments (NTFs) of A2T to WT Aβ. The A2T NTFs ranging from residue 1 to residue 7 to 10, but not 1 to 6 or shorter, are capable to retard WT Aβ fibrillization and rescue cytotoxicity. The results suggest that in the presence of full-length or specific N-terminal A2T can retard Aβ aggregation and the A2T NTFs can mitigate its toxicity. Our results provide a novel targeting site for future therapeutic development of AD.
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Affiliation(s)
- Tien-Wei Lin
- Institute of Microbiology and Immunology, National Yang-Ming University, Taipei, Taiwan
- Genomics Research Center, Academia Sinica, Taipei, Taiwan
| | - Chi-Fon Chang
- Genomics Research Center, Academia Sinica, Taipei, Taiwan
| | - Yu-Jen Chang
- Genomics Research Center, Academia Sinica, Taipei, Taiwan
| | - Yi-Hung Liao
- Genomics Research Center, Academia Sinica, Taipei, Taiwan
| | - Hui-Ming Yu
- Genomics Research Center, Academia Sinica, Taipei, Taiwan
| | - Yun-Ru Chen
- Genomics Research Center, Academia Sinica, Taipei, Taiwan
- * E-mail:
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38
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Selected Literature Watch. JOURNAL OF CAFFEINE RESEARCH 2017. [DOI: 10.1089/jcr.2016.29003.slw] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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39
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Giacomelli C, Daniele S, Martini C. Potential biomarkers and novel pharmacological targets in protein aggregation-related neurodegenerative diseases. Biochem Pharmacol 2017; 131:1-15. [PMID: 28159621 DOI: 10.1016/j.bcp.2017.01.017] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Accepted: 01/26/2017] [Indexed: 10/20/2022]
Abstract
The aggregation of specific proteins plays a pivotal role in the etiopathogenesis of several neurodegenerative diseases (NDs). β-Amyloid (Aβ) peptide-containing plaques and intraneuronal neurofibrillary tangles composed of hyperphosphorylated protein tau are the two main neuropathological lesions in Alzheimer's disease. Meanwhile, Parkinson's disease is defined by the presence of intraneuronal inclusions (Lewy bodies), in which α-synuclein (α-syn) has been identified as a major protein component. The current literature provides considerable insights into the mechanisms underlying oligomeric-related neurodegeneration, as well as the relationship between protein aggregation and ND, thus facilitating the development of novel putative biomarkers and/or pharmacological targets. Recently, α-syn, tau and Aβ have been shown to interact each other or with other "pathological proteins" to form toxic heteroaggregates. These latest findings are overcoming the concept that each neurodegenerative disease is related to the misfolding of a single specific protein. In this review, potential opportunities and pharmacological approaches targeting α-syn, tau and Aβ and their oligomeric forms are highlighted with examples from recent studies. Protein aggregation as a biomarker of NDs, in both the brain and peripheral fluids, is deeply explored. Finally, the relationship between biomarker establishment and assessment and their use as diagnostics or therapeutic targets are discussed.
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Affiliation(s)
- Chiara Giacomelli
- Department of Pharmacy, University of Pisa, Via Bonanno 6, 56126 Pisa, Italy
| | - Simona Daniele
- Department of Pharmacy, University of Pisa, Via Bonanno 6, 56126 Pisa, Italy
| | - Claudia Martini
- Department of Pharmacy, University of Pisa, Via Bonanno 6, 56126 Pisa, Italy.
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40
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Yi H, Chen H, Bian C, Tang Z, Singh AK, Qi X, Yue X, Lan Y, Lee JF, Lei A. Coordination strategy-induced selective C–H amination of 8-aminoquinolines. Chem Commun (Camb) 2017; 53:6736-6739. [DOI: 10.1039/c7cc02601c] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Using coordination-strategy, we realized a selective C–H amination of 8-aminoquinolins on the C5 position employing azoles as amines sources.
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Affiliation(s)
- Hong Yi
- College of Chemistry and Molecular Sciences
- The Institute for Advanced Studies
- Wuhan University
- Wuhan
- People's Republic of China
| | - Hong Chen
- College of Chemistry and Molecular Sciences
- The Institute for Advanced Studies
- Wuhan University
- Wuhan
- People's Republic of China
| | - Changliang Bian
- College of Chemistry and Molecular Sciences
- The Institute for Advanced Studies
- Wuhan University
- Wuhan
- People's Republic of China
| | - Zilu Tang
- College of Chemistry and Molecular Sciences
- The Institute for Advanced Studies
- Wuhan University
- Wuhan
- People's Republic of China
| | - Atul K. Singh
- College of Chemistry and Molecular Sciences
- The Institute for Advanced Studies
- Wuhan University
- Wuhan
- People's Republic of China
| | - Xiaotian Qi
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400030
- People's Republic of China
| | - Xiaoyu Yue
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400030
- People's Republic of China
| | - Yu Lan
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400030
- People's Republic of China
| | - Jyh-Fu Lee
- National Synchrotron Radiation Research Center
- Hsinchu 30076
- Taiwan
| | - Aiwen Lei
- College of Chemistry and Molecular Sciences
- The Institute for Advanced Studies
- Wuhan University
- Wuhan
- People's Republic of China
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41
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Kim HY, Lee D, Ryu KY, Choi I. A gold nanoparticle-mediated rapid in vitro assay of anti-aggregation reagents for amyloid β and its validation. Chem Commun (Camb) 2017; 53:4449-4452. [DOI: 10.1039/c7cc00358g] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
A rapidin vitrocolorimetric method for screening anti-aggregation reagents of amyloid β is reported by using gold nanoparticles.
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Affiliation(s)
- Hye Young Kim
- Nanobiointerface Laboratory
- Department of Life Science
- University of Seoul
- Seoul 130-743
- Republic of Korea
| | - Donghee Lee
- Nanobiointerface Laboratory
- Department of Life Science
- University of Seoul
- Seoul 130-743
- Republic of Korea
| | - Kwon-Yul Ryu
- Nanobiointerface Laboratory
- Department of Life Science
- University of Seoul
- Seoul 130-743
- Republic of Korea
| | - Inhee Choi
- Nanobiointerface Laboratory
- Department of Life Science
- University of Seoul
- Seoul 130-743
- Republic of Korea
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