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Koçak Aslan E, Sezer A, Tüylü Küçükkılınç T, Palaska E. Novel 1,2,4-triazole derivatives containing the naphthalene moiety as selective butyrylcholinesterase inhibitors: Design, synthesis, and biological evaluation. Arch Pharm (Weinheim) 2024:e2400406. [PMID: 39034293 DOI: 10.1002/ardp.202400406] [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: 05/22/2024] [Revised: 06/27/2024] [Accepted: 07/08/2024] [Indexed: 07/23/2024]
Abstract
Butyrylcholinesterase (BChE) is considered a promising therapeutic target for treating Alzheimer's disease due to the increase in the levels and activity of BChE in the late stage of the disease. In this study, a series of novel 1,2,4-triazole derivatives bearing the naphthalene moiety linked to the benzothiazole, thiazole, and phenyl scaffolds via amid chain were designed and synthesized as potential and selective BChE inhibitors. The results of the inhibitory activity studies revealed that most of these compounds exhibited significant inhibitor potency on BChE. Compounds 35a (0.025 ± 0.01 μM) and 37a (0.035 ± 0.01 μM) displayed the most potent inhibitory activity, with excellent selectivity against BChE over acetylcholinesterase (SIBChE, 23,686 and 16,936, respectively) among the target compounds. The kinetics studies revealed that these compounds behaved with noncompetitive BChE inhibitors. Molecular docking studies indicated that 35a and 37a fit well into the active side of BChE. In addition, 35a and 37a also had the lowest cytotoxicity for human neuroblastoma cells (SH-SY5Y), potential antioxidant capacity, moderate inhibition potency on amyloid-β1-42 aggregation, and significant neuroprotective effect against SH-SY5Y cell injury induced by H2O2 and amyloid-β1-42. All results suggest that these compounds might be considered as promising new lead compounds in the drug discovery process for the treatment of late-stage Alzheimer's disease.
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Affiliation(s)
- Ebru Koçak Aslan
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Hacettepe University, Ankara, Sıhhiye, Turkey
| | - Aysima Sezer
- Department of Biochemistry, Faculty of Pharmacy, Hacettepe University, Sıhhiye, Ankara, Turkey
| | - Tuba Tüylü Küçükkılınç
- Department of Biochemistry, Faculty of Pharmacy, Hacettepe University, Sıhhiye, Ankara, Turkey
| | - Erhan Palaska
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Hacettepe University, Ankara, Sıhhiye, Turkey
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2
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Arora R, Babbar R, Dabra A, Chopra B, Deswal G, Grewal AS. Marine-derived Compounds: A Powerful Platform for the Treatment of Alzheimer's Disease. Cent Nerv Syst Agents Med Chem 2024; 24:166-181. [PMID: 38305396 DOI: 10.2174/0118715249269050231129103002] [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] [Received: 08/08/2023] [Revised: 09/18/2023] [Accepted: 10/31/2023] [Indexed: 02/03/2024]
Abstract
Alzheimer's disease (AD) is a debilitating form of dementia that primarily affects cholinergic neurons in the brain, significantly reducing an individual's capacity for learning and creative skills and ultimately resulting in an inability to carry out even basic daily tasks. As the elderly population is exponentially increasing, the disease has become a significant concern for society. Therefore, neuroprotective substances have garnered considerable interest in addressing this universal issue. Studies have shown that oxidative damage to neurons contributes to the pathophysiological processes underlying AD progression. In AD, tau phosphorylation and glutamate excitotoxicity may play essential roles, but no permanent cure for AD is available. The existing therapies only manage the early symptoms of AD and often come with numerous side effects and toxicities. To address these challenges, researchers have turned to nature and explored various sources such as plants, animals, and marine organisms. Many historic holy books from different cultures emphasize that adding marine compounds to the regular diet enhances brain function and mitigates its decline. Consequently, researchers have devoted significant time to identifying potentially active neuroprotective substances from marine sources. Marine-derived compounds are gaining recognition due to their abundant supply of diverse chemical compounds with biological and pharmacological potential and unique mechanisms of action. Several studies have reported that plants exhibit multitarget potential in treating AD. In light of this, the current study focuses on marine-derived components with excellent potential for treating this neurodegenerative disease.
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Affiliation(s)
- Rashmi Arora
- Chitkara College of Pharmacy, Chitkara University, Chandigarh, Punjab, India
| | - Ritchu Babbar
- Chitkara College of Pharmacy, Chitkara University, Chandigarh, Punjab, India
| | - Abhishek Dabra
- Guru Gobind Singh College of Pharmacy, Yamunanagar, Haryana, India
| | - Bhawna Chopra
- Guru Gobind Singh College of Pharmacy, Yamunanagar, Haryana, India
| | - Geeta Deswal
- Guru Gobind Singh College of Pharmacy, Yamunanagar, Haryana, India
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3
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Smith AA, Moore KBE, Ambs PM, Saraswati AP, Fortin JS. Recent Advances in the Discovery of Therapeutics to Curtail Islet Amyloid Polypeptide Aggregation for Type 2 Diabetes Treatment. Adv Biol (Weinh) 2022; 6:e2101301. [PMID: 35931462 DOI: 10.1002/adbi.202101301] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2021] [Revised: 07/04/2022] [Indexed: 01/28/2023]
Abstract
In humans with type 2 diabetes, at least 70% of patients exhibit islet amyloid plaques formed by misfolding islet amyloid polypeptides (IAPP). The oligomeric conformation and accumulation of the IAPP plaques lead to a panoply of cytotoxic effects on the islet β-cells. Currently, no marketed therapies for the prevention or elimination of these amyloid deposits exist, and therefore significant efforts are required to address this gap. To date, most of the experimental treatments are limited to only in vitro stages of testing. In general, the proposed therapeutics use various targeting strategies, such as binding to the N-terminal region of islet amyloid polypeptide on residues 1-19 or the hydrophobic region of IAPP. Other strategies include targeting the peptide self-assembly through π-stacking. These methods are realized by using several different families of compounds, four of which are highlighted in this review: naturally occurring products, small molecules, organometallic compounds, and nanoparticles. Each of these categories holds immense potential to optimize and develop inhibitor(s) of pancreatic amyloidosis in the near future.
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Affiliation(s)
- Alyssa A Smith
- Basic Medical Sciences, College of Veterinary Medicine, Purdue University, West Lafayette, IN, 47907, USA
| | - Kendall B E Moore
- Basic Medical Sciences, College of Veterinary Medicine, Purdue University, West Lafayette, IN, 47907, USA
| | | | - Akella Prasanth Saraswati
- Basic Medical Sciences, College of Veterinary Medicine, Purdue University, West Lafayette, IN, 47907, USA
| | - Jessica S Fortin
- Basic Medical Sciences, College of Veterinary Medicine, Purdue University, West Lafayette, IN, 47907, USA
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4
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Sahin Z, Biltekin SN, Yurttaş L, Berk B, Küçükkılınç TT, Demirayak Ş. Novel benzofurane carbonyl analogs of donepezil as acetylcholinesterase inhibitors. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.133193] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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5
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Prebble DW, Er S, Hlushchuk I, Domanskyi A, Airavaara M, Ekins MG, Mellick GD, Carroll AR. α-Synuclein binding activity of the plant growth promoter asterubine. Bioorg Med Chem Lett 2022; 64:128677. [PMID: 35301136 DOI: 10.1016/j.bmcl.2022.128677] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 03/05/2022] [Accepted: 03/12/2022] [Indexed: 11/02/2022]
Abstract
Preventing the aggregation of certain amyloid proteins has the potential to slow down the progression of diseases like Alzheimer's, Parkinson's, and type 2 diabetes mellitus. During a high-throughput screen of 300 Australian marine invertebrate extracts, the extract of the marine sponge Thorectandra sp. 4408 displayed binding activity to the Parkinson's disease-associated protein, α-synuclein. Isolation of the active component led to its identification as the known plant growth promoter asterubine (1). This molecule shares distinct structural similarities with potent amyloid beta aggregation inhibitors tramiprosate (homotaurine) and ALZ-801. Herein we report the isolation, NMR data acquired in DMSO and α-synuclein binding activity of asterubine (1).
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Affiliation(s)
- Dale W Prebble
- School of Environment and Science, Griffith University (Gold Coast Campus), Parklands Drive, Southport, QLD 4222, Australia; Griffith Institute for Drug Discovery, Griffith University (Brisbane Innovation Park), Don Young Road, Nathan, QLD 4111, Australia
| | - Safak Er
- Faculty of Pharmacy, University of Helsinki, Helsinki 00014, Finland; Institute of Biotechnology, HiLIFE, University of Helsinki, Helsinki 00014, Finland
| | - Irena Hlushchuk
- Faculty of Pharmacy, University of Helsinki, Helsinki 00014, Finland
| | - Andrii Domanskyi
- Institute of Biotechnology, HiLIFE, University of Helsinki, Helsinki 00014, Finland
| | - Mikko Airavaara
- Faculty of Pharmacy, University of Helsinki, Helsinki 00014, Finland; Neuroscience Center, HiLIFE, University of Helsinki, Helsinki 00014, Finland
| | - Merrick G Ekins
- Griffith Institute for Drug Discovery, Griffith University (Brisbane Innovation Park), Don Young Road, Nathan, QLD 4111, Australia; Queensland Museum, South Brisbane BC, QLD 4101, Australia
| | - George D Mellick
- School of Environment and Science, Griffith University (Gold Coast Campus), Parklands Drive, Southport, QLD 4222, Australia; Griffith Institute for Drug Discovery, Griffith University (Brisbane Innovation Park), Don Young Road, Nathan, QLD 4111, Australia
| | - Anthony R Carroll
- School of Environment and Science, Griffith University (Gold Coast Campus), Parklands Drive, Southport, QLD 4222, Australia; Griffith Institute for Drug Discovery, Griffith University (Brisbane Innovation Park), Don Young Road, Nathan, QLD 4111, Australia.
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6
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Umeda T, Uekado R, Shigemori K, Eguchi H, Tomiyama T. Nasal Rifampicin Halts the Progression of Tauopathy by Inhibiting Tau Oligomer Propagation in Alzheimer Brain Extract-Injected Mice. Biomedicines 2022; 10:biomedicines10020297. [PMID: 35203506 PMCID: PMC8869211 DOI: 10.3390/biomedicines10020297] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 01/24/2022] [Accepted: 01/25/2022] [Indexed: 01/27/2023] Open
Abstract
The cell-to-cell transmission of tau aggregates is considered a mechanism underlying the intracerebral spreading of tau pathology in Alzheimer’s disease (AD) and other tauopathies. Recent studies suggest that tau oligomers, rather than fibrils, participate in this process. We previously showed that intranasal rifampicin inhibits tau oligomer accumulation and improves cognition in tauopathy mice. In the present study, we examined the effects of nasal rifampicin on tau propagation in a new mouse model of tauopathy. A tau oligomer-rich fraction prepared from the brain of an AD patient was injected into a unilateral hippocampus of tau264 mice that express both 3-repeat and 4-repeat wild-type human tau. Rifampicin administration was started one week after the injection and performed three times a week for 24 weeks. Cognitive function and tau pathology were assessed by the Morris water maze test and brain section staining. Rifampicin treatment inhibited the spreading of tau oligomers from the injection site to other brain regions and neurofibrillary tangle formation in the entorhinal cortex. Synapse and neuronal loss in the hippocampus were also prevented, and cognitive function remained normal. These results suggest that intranasal rifampicin could be a promising remedy that halts the progression of tauopathy by inhibiting tau oligomer propagation.
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Affiliation(s)
- Tomohiro Umeda
- Department of Translational Neuroscience, Graduate School of Medicine, Osaka City University, 1-4-3 Asahimachi, Abeno-ku, Osaka 545-8585, Japan; (T.U.); (R.U.); (K.S.)
| | - Rumi Uekado
- Department of Translational Neuroscience, Graduate School of Medicine, Osaka City University, 1-4-3 Asahimachi, Abeno-ku, Osaka 545-8585, Japan; (T.U.); (R.U.); (K.S.)
| | - Keiko Shigemori
- Department of Translational Neuroscience, Graduate School of Medicine, Osaka City University, 1-4-3 Asahimachi, Abeno-ku, Osaka 545-8585, Japan; (T.U.); (R.U.); (K.S.)
| | - Hiroshi Eguchi
- Pharmaceutical Discovery Research Laboratories, Teijin Pharma Ltd., 4-3-2 Asahigaoka, Hino 191-8512, Japan;
| | - Takami Tomiyama
- Department of Translational Neuroscience, Graduate School of Medicine, Osaka City University, 1-4-3 Asahimachi, Abeno-ku, Osaka 545-8585, Japan; (T.U.); (R.U.); (K.S.)
- Correspondence: ; Tel.: +81-6-6645-3921
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7
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Umeda T, Sakai A, Shigemori K, Yokota A, Kumagai T, Tomiyama T. Oligomer-Targeting Prevention of Neurodegenerative Dementia by Intranasal Rifampicin and Resveratrol Combination - A Preclinical Study in Model Mice. Front Neurosci 2021; 15:763476. [PMID: 34966254 PMCID: PMC8710719 DOI: 10.3389/fnins.2021.763476] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Accepted: 11/23/2021] [Indexed: 12/15/2022] Open
Abstract
Amyloidogenic protein oligomers are thought to play an important role in the pathogenesis of neurodegenerative dementia, including Alzheimer’s disease, frontotemporal dementia, and dementia with Lewy bodies. Previously we demonstrated that oral or intranasal rifampicin improved the cognition of APP-, tau-, and α-synuclein-transgenic mice by reducing the amount of Aβ, tau, and α-synuclein oligomers in the brain. In the present study, to explore more effective and safer medications for dementia, we tested the drug combination of rifampicin and resveratrol, which is a multifunctional natural polyphenol with the potential to antagonize the adverse effects of rifampicin. The mixture was intranasally administered to APP-, tau-, and α-synuclein-transgenic mice, and their memory and oligomer-related pathologies were evaluated. Compared with rifampicin and resveratrol alone, the combinatorial medicine significantly improved mouse cognition, reduced amyloid oligomer accumulation, and recovered synaptophysin levels in the hippocampus. The plasma levels of liver enzymes, which reflect hepatic injury and normally increase by rifampicin treatment, remained normal by the combination treatment. Notably, resveratrol alone and the combinatorial medicine, but not rifampicin alone, enhanced the levels of brain-derived neurotrophic factor (BDNF) and its precursor, pro-BDNF, in the hippocampus. Furthermore, the combination showed a synergistic effect in ameliorating mouse cognition. These results show the advantages of this combinatorial medicine with regards to safety and effectiveness over single-drug rifampicin. Our findings may provide a feasible means for the prevention of neurodegenerative dementia that targets toxic oligomers.
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Affiliation(s)
- Tomohiro Umeda
- Department of Translational Neuroscience, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Ayumi Sakai
- Department of Translational Neuroscience, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Keiko Shigemori
- Department of Translational Neuroscience, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Ayumi Yokota
- Department of Translational Neuroscience, Osaka City University Graduate School of Medicine, Osaka, Japan
| | | | - Takami Tomiyama
- Department of Translational Neuroscience, Osaka City University Graduate School of Medicine, Osaka, Japan.,Medilabo RFP, Inc., Kyoto, Japan
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8
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Anti-Alzheimer's Molecules Derived from Marine Life: Understanding Molecular Mechanisms and Therapeutic Potential. Mar Drugs 2021; 19:md19050251. [PMID: 33925063 PMCID: PMC8146595 DOI: 10.3390/md19050251] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Revised: 04/19/2021] [Accepted: 04/26/2021] [Indexed: 02/08/2023] Open
Abstract
Alzheimer’s disease (AD) is a devastating neurodegenerative disease and the most common cause of dementia. It has been confirmed that the pathological processes that intervene in AD development are linked with oxidative damage to neurons, neuroinflammation, tau phosphorylation, amyloid beta (Aβ) aggregation, glutamate excitotoxicity, and cholinergic deficit. Still, there is no available therapy that can cure AD. Available therapies only manage some of the AD symptoms at the early stages of AD. Various studies have revealed that bioactive compounds derived from marine organisms and plants can exert neuroprotective activities with fewer adverse events, as compared with synthetic drugs. Furthermore, marine organisms have been identified as a source of novel compounds with therapeutic potential. Thus, there is a growing interest regarding bioactive compounds derived from marine sources that have anti-AD potentials. Various marine drugs including bryostatin-1, homotaurine, anabaseine and its derivative, rifampicins, anhydroexfoliamycin, undecylprodigioisin, gracilins, 13-desmethyl spirolide-C, and dictyostatin displayed excellent bioavailability and efficacy against AD. Most of these marine drugs were found to be well-tolerated in AD patients, along with no significant drug-associated adverse events. In this review, we focus on the drugs derived from marine life that can be useful in AD treatment and also summarize the therapeutic agents that are currently used to treat AD.
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9
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Tang Y, Zhang D, Zhang Y, Liu Y, Gong X, Chang Y, Ren B, Zheng J. Introduction and Fundamentals of Human Islet Amyloid Polypeptide Inhibitors. ACS APPLIED BIO MATERIALS 2020; 3:8286-8308. [DOI: 10.1021/acsabm.0c01234] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Yijing Tang
- Department of Chemical, Biomolecular, and Corrosion Engineering, The University of Akron, Akron, Ohio 44325-3906, United States
| | - Dong Zhang
- Department of Chemical, Biomolecular, and Corrosion Engineering, The University of Akron, Akron, Ohio 44325-3906, United States
| | - Yanxian Zhang
- Department of Chemical, Biomolecular, and Corrosion Engineering, The University of Akron, Akron, Ohio 44325-3906, United States
| | - Yonglan Liu
- Department of Chemical, Biomolecular, and Corrosion Engineering, The University of Akron, Akron, Ohio 44325-3906, United States
| | - Xiong Gong
- Department of Polymer Engineering, The University of Akron, Akron, Ohio 44325-0301, United States
| | - Yung Chang
- Department of Chemical Engineering, R&D Center for Membrane Technology, Chung Yuan Christian University, Taoyuan 320, Taiwan
| | - Baiping Ren
- Department of Chemical, Biomolecular, and Corrosion Engineering, The University of Akron, Akron, Ohio 44325-3906, United States
| | - Jie Zheng
- Department of Chemical, Biomolecular, and Corrosion Engineering, The University of Akron, Akron, Ohio 44325-3906, United States
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10
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Long-term exposure to constant light induces dementia, oxidative stress and promotes aggregation of sub-pathological Aβ42 in Wistar rats. Pharmacol Biochem Behav 2020; 192:172892. [DOI: 10.1016/j.pbb.2020.172892] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 03/02/2020] [Accepted: 03/02/2020] [Indexed: 12/17/2022]
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11
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Sivanesam K, Andersen N. Pre-structured hydrophobic peptide β-strands: A universal amyloid trap? Arch Biochem Biophys 2019; 664:51-61. [PMID: 30707943 PMCID: PMC7094768 DOI: 10.1016/j.abb.2019.01.032] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2018] [Revised: 01/28/2019] [Accepted: 01/28/2019] [Indexed: 01/21/2023]
Abstract
Amyloid fibril formation has long been studied because of the variety of proteins that are capable of adopting this structure despite sharing little sequence homology. This makes amyloid fibrils a challenging focus for inhibition studies because the peptides and proteins that form amyloid fibrils cannot be targeted based on a sequence motif. Most peptide inhibitors that target specific amyloidogenic proteins rely heavily on sequence recognition to ensure that the inhibitory peptide is able to bind its target. This approach is limited to targeting one amyloidogenic protein at a time. However, there is increasing evidence of cross-reactivity between amyloid-forming polypeptides. It has therefore become more useful to study the similarities between these proteins that goes beyond their sequence homology. Indeed, the observation that amyloidogenic proteins adopt similar secondary structures along the pathway to fibril formation opens the way to an interesting investigation: the development of inhibitors that could be universal amyloid traps. The review below will analyze two specific amyloidogenic proteins, α-synuclein and human amylin, and introduce a small number of peptides that have been shown to be capable of inhibiting the amyloidogenesis of both of these very dissimilar polypeptides. Some of the inhibitory peptide motifs may indeed, be applicable to Aβ and other amyloidogenic systems.
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12
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Agatonovic-Kustrin S, Kettle C, Morton DW. A molecular approach in drug development for Alzheimer's disease. Biomed Pharmacother 2018; 106:553-565. [PMID: 29990843 DOI: 10.1016/j.biopha.2018.06.147] [Citation(s) in RCA: 136] [Impact Index Per Article: 22.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Revised: 06/20/2018] [Accepted: 06/27/2018] [Indexed: 01/08/2023] Open
Abstract
An increase in dementia numbers and global trends in population aging across the world prompts the need for new medications to treat the complex biological dysfunctions, such as neurodegeneration associated with dementia. Alzheimer's disease (AD) is the most common form of dementia. Cholinergic signaling, which is important in cognition, is slowly lost in AD, so the first line therapy is to treat symptoms with acetylcholinesterase inhibitors to increase levels of acetylcholine. Out of five available FDA-approved AD medications, donepezil, galantamine and rivastigmine are cholinesterase inhibitors while memantine, a N-methyl d-aspartate (NMDA) receptor antagonist, blocks the effects of high glutamate levels. The fifth medication consists of a combination of donepezil and memantine. Although these medications can reduce and temporarily slow down the symptoms of AD, they cannot stop the damage to the brain from progressing. For a superior therapeutic effect, multi-target drugs are required. Thus, a Multi-Target-Directed Ligand (MTDL) strategy has received more attention by scientists who are attempting to develop hybrid molecules that simultaneously modulate multiple biological targets. This review highlights recent examples of the MTDL approach and fragment based strategy in the rational design of new potential AD medications.
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Affiliation(s)
- Snezana Agatonovic-Kustrin
- School of Pharmacy, Monash University Malaysia, Jalan Lagoon Selatan, Bandar Sunway, 47500, Selangor Darul Ehsan, Malaysia; School of Pharmacy and Applied Science, La Trobe Institute for Molecular Sciences, La Trobe University, Edwards Rd., Bendigo, 3550, Australia.
| | - Christine Kettle
- School of Pharmacy and Applied Science, La Trobe Institute for Molecular Sciences, La Trobe University, Edwards Rd., Bendigo, 3550, Australia
| | - David W Morton
- School of Pharmacy and Applied Science, La Trobe Institute for Molecular Sciences, La Trobe University, Edwards Rd., Bendigo, 3550, Australia
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13
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Yulug B, Hanoglu L, Ozansoy M, Isık D, Kilic U, Kilic E, Schabitz WR. Therapeutic role of rifampicin in Alzheimer's disease. Psychiatry Clin Neurosci 2018; 72:152-159. [PMID: 29315976 DOI: 10.1111/pcn.12637] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Revised: 12/06/2017] [Accepted: 12/17/2017] [Indexed: 12/11/2022]
Abstract
Rifampicin exerts significant brain protective functions in multiple experimental models. Here we summarize the underlying mechanisms of the neuroprotective and pro-cognitive effects of rifampicin that are mediated by its anti-inflammatory, anti-tau, anti-amyloid, and cholinergic effects. Beyond suggesting that rifampicin shows strong brain protective effects in preclinical models of Alzheimer's disease, we also provide substantial clinical evidence for the neuroprotective and pro-cognitive effects of rifampicin. Future neuroimaging studies combined with clinical assessment scores are the following steps to be taken in this field of research.
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Affiliation(s)
- Burak Yulug
- Department of Neurology, Istanbul Medipol University, Istanbul, Turkey.,Department of Restorative and Regenerative Medicine, Istanbul Medipol University, Istanbul, Turkey
| | - Lütfü Hanoglu
- Department of Neurology, Istanbul Medipol University, Istanbul, Turkey.,Department of Restorative and Regenerative Medicine, Istanbul Medipol University, Istanbul, Turkey
| | - Mehmet Ozansoy
- Department of Restorative and Regenerative Medicine, Istanbul Medipol University, Istanbul, Turkey.,Department of Physiology, International School of Medicine, Istanbul Medipol University, Istanbul, Turkey
| | - Dogan Isık
- Department of Psychiatry, Istanbul Medipol University, Istanbul, Turkey
| | - Ulkan Kilic
- Department of Medical Biology, Faculty of Medicine, University of Health Sciences, Istanbul, Turkey
| | - Ertugrul Kilic
- Department of Restorative and Regenerative Medicine, Istanbul Medipol University, Istanbul, Turkey.,Department of Physiology, International School of Medicine, Istanbul Medipol University, Istanbul, Turkey
| | - Wolf Rüdiger Schabitz
- Department of Neurology, Bethel, EVKB, Bielefeld, University of Münster, Münster, Germany
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14
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Socias SB, González-Lizárraga F, Avila CL, Vera C, Acuña L, Sepulveda-Diaz JE, Del-Bel E, Raisman-Vozari R, Chehin RN. Exploiting the therapeutic potential of ready-to-use drugs: Repurposing antibiotics against amyloid aggregation in neurodegenerative diseases. Prog Neurobiol 2017; 162:17-36. [PMID: 29241812 DOI: 10.1016/j.pneurobio.2017.12.002] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Revised: 12/07/2017] [Accepted: 12/07/2017] [Indexed: 01/02/2023]
Abstract
Neurodegenerative diseases are chronic and progressive disorders that affect specific regions of the brain, causing gradual disability and suffering that results in a complete inability of patients to perform daily functions. Amyloid aggregation of specific proteins is the most common biological event that is responsible for neuronal death and neurodegeneration in various neurodegenerative diseases. Therapeutic agents capable of interfering with the abnormal aggregation are required, but traditional drug discovery has fallen short. The exploration of new uses for approved drugs provides a useful alternative to fill the gap between the increasing incidence of neurodegenerative diseases and the long-term assessment of classical drug discovery technologies. Drug re-profiling is currently the quickest possible transition from bench to bedside. In this way, experimental evidence shows that some antibiotic compounds exert neuroprotective action through anti-aggregating activity on disease-associated proteins. The finding that many antibiotics can cross the blood-brain barrier and have been used for several decades without serious toxic effects makes them excellent candidates for therapeutic switching towards neurological disorders. The present review is, to our knowledge, the first extensive evaluation and analysis of the anti-amyloidogenic effect of different antibiotics on well-known disease-associated proteins. In addition, we propose a common structural signature derived from the antiaggregant antibiotic molecules that could be relevant to rational drug discovery.
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Affiliation(s)
- Sergio B Socias
- Instituto Superior de Investigaciones Biológicas (INSIBIO), CONICET-UNT, and Instituto de Química Biológica "Dr. Bernabé Bloj", Facultad de Bioquímica, Química y Farmacia, UNT. Chacabuco 461, T4000ILI, San Miguel de Tucumán, Argentina, Argentina
| | - Florencia González-Lizárraga
- Instituto Superior de Investigaciones Biológicas (INSIBIO), CONICET-UNT, and Instituto de Química Biológica "Dr. Bernabé Bloj", Facultad de Bioquímica, Química y Farmacia, UNT. Chacabuco 461, T4000ILI, San Miguel de Tucumán, Argentina, Argentina
| | - Cesar L Avila
- Instituto Superior de Investigaciones Biológicas (INSIBIO), CONICET-UNT, and Instituto de Química Biológica "Dr. Bernabé Bloj", Facultad de Bioquímica, Química y Farmacia, UNT. Chacabuco 461, T4000ILI, San Miguel de Tucumán, Argentina, Argentina
| | - Cecilia Vera
- Instituto Superior de Investigaciones Biológicas (INSIBIO), CONICET-UNT, and Instituto de Química Biológica "Dr. Bernabé Bloj", Facultad de Bioquímica, Química y Farmacia, UNT. Chacabuco 461, T4000ILI, San Miguel de Tucumán, Argentina, Argentina
| | - Leonardo Acuña
- Instituto Superior de Investigaciones Biológicas (INSIBIO), CONICET-UNT, and Instituto de Química Biológica "Dr. Bernabé Bloj", Facultad de Bioquímica, Química y Farmacia, UNT. Chacabuco 461, T4000ILI, San Miguel de Tucumán, Argentina, Argentina; Sorbonne Universite, UPMC Univ Paris 06, INSERM, CNRS, UM75, U1127, UMR 7225, Institut du Cerveau et de la Moelle Epinière, Paris, France
| | - Julia E Sepulveda-Diaz
- Sorbonne Universite, UPMC Univ Paris 06, INSERM, CNRS, UM75, U1127, UMR 7225, Institut du Cerveau et de la Moelle Epinière, Paris, France
| | - Elaine Del-Bel
- Department of Morphology, Physiology and Stomatology, Faculty of Odontology of Ribeirão Preto, University of São Paulo, Brazil; Center of Interdisciplinary Research on Applied Neurosciences (NAPNA), University of São Paulo, Brazil
| | - Rita Raisman-Vozari
- Sorbonne Universite, UPMC Univ Paris 06, INSERM, CNRS, UM75, U1127, UMR 7225, Institut du Cerveau et de la Moelle Epinière, Paris, France.
| | - Rosana N Chehin
- Instituto Superior de Investigaciones Biológicas (INSIBIO), CONICET-UNT, and Instituto de Química Biológica "Dr. Bernabé Bloj", Facultad de Bioquímica, Química y Farmacia, UNT. Chacabuco 461, T4000ILI, San Miguel de Tucumán, Argentina, Argentina.
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15
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Iizuka T, Morimoto K, Sasaki Y, Kameyama M, Kurashima A, Hayasaka K, Ogata H, Goto H. Preventive Effect of Rifampicin on Alzheimer Disease Needs at Least 450 mg Daily for 1 Year: An FDG-PET Follow-Up Study. Dement Geriatr Cogn Dis Extra 2017; 7:204-214. [PMID: 28690634 PMCID: PMC5498941 DOI: 10.1159/000477343] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2017] [Revised: 05/03/2017] [Indexed: 12/11/2022] Open
Abstract
Background Rifampicin was reported to inhibit amyloid-β oligomerization and tau hyperphosphorylation in mouse models and could serve as a promising available medicine for the prevention of Alzheimer disease (AD). To examine whether rifampicin has such preventive effects in humans, we retrospectively reviewed 18F-FDG-PET findings of elderly patients with mycobacterium infection treated with rifampicin. Methods Forty nondemented elderly patients treated with rifampicin for mycobacterium infections who showed AD-type hypometabolism were enrolled. The hypometabolic patterns were evaluated with stereotaxic statistical analysis and region of interest analysis. Results Before treatment, AD-type hypometa bolism was observed in 12 patients. The FDG uptake in the posterior cingulate cortex (PCC) was improved or stabilized in 6 patients after 12-month therapy (450 mg/day), whereas another 6 patients with 6-month therapy showed a decreased FDG uptake in the PCC. In patients who underwent FDG-PET only after treatment, the metabolic decline in the PCC was significantly milder in patients with ≥12 months of rifampicin treatment than in those with 6 months of treatment. Multiple regression analysis revealed that the dose of rifampicin and treatment duration significantly influenced FDG uptake in the PCC. Conclusion The preventive effect of rifampicin depended on the dose and the treatment duration, and the effect needs at least 450 mg daily for 1 year.
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Affiliation(s)
- Tomomichi Iizuka
- Center for Dementia, Fukujuji Hospital, Japan Anti-Tuberculosis Association, Kiyose, Japan
| | - Kozo Morimoto
- Respiratory Disease Center, Fukujuji Hospital, Japan Anti-Tuberculosis Association, Kiyose, Japan
| | - Yuka Sasaki
- Respiratory Disease Center, Fukujuji Hospital, Japan Anti-Tuberculosis Association, Kiyose, Japan.,Tuberculosis Center, Fukujuji Hospital, Japan Anti-Tuberculosis Association, Kiyose, Japan
| | - Masashi Kameyama
- Department of Radiology, Tokyo Metropolitan Geriatric Hospital, Itabashi, Japan
| | - Atsuyuki Kurashima
- Respiratory Disease Center, Fukujuji Hospital, Japan Anti-Tuberculosis Association, Kiyose, Japan
| | - Kazumasa Hayasaka
- Division of Nuclear Medicine, Department of Radiology, Fukujuji Hospital, Japan Anti-Tuberculosis Association, Kiyose, Japan
| | - Hideo Ogata
- Respiratory Disease Center, Fukujuji Hospital, Japan Anti-Tuberculosis Association, Kiyose, Japan
| | - Hajime Goto
- Respiratory Disease Center, Fukujuji Hospital, Japan Anti-Tuberculosis Association, Kiyose, Japan
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16
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Zhang Y, Song W. Islet amyloid polypeptide: Another key molecule in Alzheimer's pathogenesis? Prog Neurobiol 2017; 153:100-120. [PMID: 28274676 DOI: 10.1016/j.pneurobio.2017.03.001] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2016] [Revised: 02/17/2017] [Accepted: 03/02/2017] [Indexed: 12/14/2022]
Abstract
Recent epidemiological evidence reveals that patients suffering from type 2 diabetes mellitus (T2DM) often experience a significant decline in cognitive function, and approximately 70% of those cases eventually develop Alzheimer's disease (AD). Although several pathological processes are shared by AD and T2DM, the exact molecular mechanisms connecting these two diseases are poorly understood. Aggregation of human islet amyloid polypeptide (hIAPP), the pathological hallmark of T2DM, has also been detected in brain tissue and is associated with cognitive decline and AD development. In addition, hIAPP and amyloid β protein (Aβ) share many biophysical and physiological properties as well as exert similar cytotoxic mechanisms. Therefore, it is important to examine the possible role of hIAPP in the pathogenesis of AD. In this article, we introduce the basics on this amyloidogenic protein. More importantly, we discuss the potential mechanisms of hIAPP-induced AD development, which will be beneficial for proposing novel and feasible strategies to optimize AD prevention and/or treatment in diabetics.
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Affiliation(s)
- Yun Zhang
- Townsend Family Laboratories, Department of Psychiatry, The University of British Columbia, 2255 Wesbrook Mall, Vancouver, BC V6T 1Z3, Canada
| | - Weihong Song
- Townsend Family Laboratories, Department of Psychiatry, The University of British Columbia, 2255 Wesbrook Mall, Vancouver, BC V6T 1Z3, Canada.
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17
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Umeda T, Ono K, Sakai A, Yamashita M, Mizuguchi M, Klein WL, Yamada M, Mori H, Tomiyama T. Rifampicin is a candidate preventive medicine against amyloid-β and tau oligomers. Brain 2016; 139:1568-86. [PMID: 27020329 DOI: 10.1093/brain/aww042] [Citation(s) in RCA: 87] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2015] [Accepted: 01/04/2016] [Indexed: 01/02/2023] Open
Abstract
Amyloid-β, tau, and α-synuclein, or more specifically their soluble oligomers, are the aetiologic molecules in Alzheimer's disease, tauopathies, and α-synucleinopathies, respectively. These proteins have been shown to interact to accelerate each other's pathology. Clinical studies of amyloid-β-targeting therapies in Alzheimer's disease have revealed that the treatments after disease onset have little benefit on patient cognition. These findings prompted us to explore a preventive medicine which is orally available, has few adverse effects, and is effective at reducing neurotoxic oligomers with a broad spectrum. We initially tested five candidate compounds: rifampicin, curcumin, epigallocatechin-3-gallate, myricetin, and scyllo-inositol, in cells expressing amyloid precursor protein (APP) with the Osaka (E693Δ) mutation, which promotes amyloid-β oligomerization. Among these compounds, rifampicin, a well-known antibiotic, showed the strongest activities against the accumulation and toxicity (i.e. cytochrome c release from mitochondria) of intracellular amyloid-β oligomers. Under cell-free conditions, rifampicin inhibited oligomer formation of amyloid-β, tau, and α-synuclein, indicating its broad spectrum. The inhibitory effects of rifampicin against amyloid-β and tau oligomers were evaluated in APPOSK mice (amyloid-β oligomer model), Tg2576 mice (Alzheimer's disease model), and tau609 mice (tauopathy model). When orally administered to 17-month-old APPOSK mice at 0.5 and 1 mg/day for 1 month, rifampicin reduced the accumulation of amyloid-β oligomers as well as tau hyperphosphorylation, synapse loss, and microglial activation in a dose-dependent manner. In the Morris water maze, rifampicin at 1 mg/day improved memory of the mice to a level similar to that in non-transgenic littermates. Rifampicin also inhibited cytochrome c release from the mitochondria and caspase 3 activation in the hippocampus. In 13-month-old Tg2576 mice, oral rifampicin at 0.5 mg/day for 1 month decreased amyloid-β oligomer accumulation, tau hyperphosphorylation, synapse loss, and microglial activation, but not amyloid deposition. Rifampicin treatment to 14-15-month-old tau609 mice at 0.5 and 1 mg/day for 1 month also reduced tau oligomer accumulation, tau hyperphosphorylation, synapse loss, and microglial activation in a dose-dependent fashion, and improved the memory almost completely at 1 mg/day. In addition, rifampicin decreased the level of p62/sequestosome-1 in the brain without affecting the increased levels of LC3 (microtubule-associated protein light chain 3) conversion, suggesting the restoration of autophagy-lysosomal function. Considering its prescribed dose and safety in humans, these results indicate that rifampicin could be a promising, ready-to-use medicine for the prevention of Alzheimer's disease and other neurodegenerative diseases.
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Affiliation(s)
- Tomohiro Umeda
- Department of Neuroscience, Osaka City University Graduate School of Medicine, Osaka, Japan Core Research for Evolutional Science and Technology, Japan Science and Technology Agency, Kawaguchi, Japan
| | - Kenjiro Ono
- Department of Neurology and Neurobiology and Aging, Kanazawa University Graduate School of Medical Science, Kanazawa, Japan
| | - Ayumi Sakai
- Department of Neuroscience, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Minato Yamashita
- Department of Neuroscience, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Mineyuki Mizuguchi
- Laboratory of Structual Biology, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, Japan
| | - William L Klein
- Department of Neurobiology, Weinberg College of Arts and Science, Northwestern University, Evanston, IL, USA
| | - Masahito Yamada
- Department of Neurology and Neurobiology and Aging, Kanazawa University Graduate School of Medical Science, Kanazawa, Japan
| | - Hiroshi Mori
- Core Research for Evolutional Science and Technology, Japan Science and Technology Agency, Kawaguchi, Japan Department of Clinical Neuroscience, Osaka City University Medical School, Osaka, Japan
| | - Takami Tomiyama
- Department of Neuroscience, Osaka City University Graduate School of Medicine, Osaka, Japan Core Research for Evolutional Science and Technology, Japan Science and Technology Agency, Kawaguchi, Japan
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18
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How SC, Yang SM, Hsin A, Tseng CP, Hsueh SS, Lin MS, Chen RPY, Chou WL, Wang SSS. Examining the inhibitory potency of food additive fast green FCF against amyloid fibrillogenesis under acidic conditions. Food Funct 2016; 7:4898-4907. [DOI: 10.1039/c6fo00792a] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Amyloid fibril formation of hen lysozyme (HEWL) can be attenuated by fast green FCF.
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Affiliation(s)
- Su-Chun How
- Department of Chemical Engineering
- National Taiwan University
- Taipei 10617
- Taiwan
| | - Szu-Ming Yang
- Department of Chemical Engineering
- National Taiwan University
- Taipei 10617
- Taiwan
| | - Ai Hsin
- Department of Chemical Engineering
- National Taiwan University
- Taipei 10617
- Taiwan
| | - Chia-Ping Tseng
- Department of Chemical Engineering
- National Taiwan University
- Taipei 10617
- Taiwan
| | - Shu-Shun Hsueh
- Department of Chemical Engineering
- National Taiwan University
- Taipei 10617
- Taiwan
| | | | - Rita P.-Y. Chen
- Institute of Biochemical Sciences
- National Taiwan University
- Taipei 10617
- Taiwan
- Institute of Biological Chemistry
| | - Wei-Lung Chou
- Department of Safety
- Health and Environmental Engineering
- Hungkuang University
- Taichung City 433
- Taiwan
| | - Steven S.-S. Wang
- Department of Chemical Engineering
- National Taiwan University
- Taipei 10617
- Taiwan
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19
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Nguyen PT, Sharma R, Rej R, De Carufel CA, Roy R, Bourgault S. Low generation anionic dendrimers modulate islet amyloid polypeptide self-assembly and inhibit pancreatic β-cell toxicity. RSC Adv 2016. [DOI: 10.1039/c6ra15373a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
The self-assembly and cytotoxicity of the amyloidogenic peptide IAPP can be controlled with low generation anionic dendrimers.
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Affiliation(s)
- Phuong T. Nguyen
- Department of Chemistry
- Pharmaqam
- University of Québec in Montreal
- Montreal
- Canada
| | - Rishi Sharma
- Department of Chemistry
- Pharmaqam
- University of Québec in Montreal
- Montreal
- Canada
| | - Rabindra Rej
- Department of Chemistry
- Pharmaqam
- University of Québec in Montreal
- Montreal
- Canada
| | | | - René Roy
- Department of Chemistry
- Pharmaqam
- University of Québec in Montreal
- Montreal
- Canada
| | - Steve Bourgault
- Department of Chemistry
- Pharmaqam
- University of Québec in Montreal
- Montreal
- Canada
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20
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Lopes DHJ, Attar A, Nair G, Hayden EY, Du Z, McDaniel K, Dutt S, Bandmann H, Bravo-Rodriguez K, Mittal S, Klärner FG, Wang C, Sanchez-Garcia E, Schrader T, Bitan G. Molecular tweezers inhibit islet amyloid polypeptide assembly and toxicity by a new mechanism. ACS Chem Biol 2015; 10:1555-69. [PMID: 25844890 DOI: 10.1021/acschembio.5b00146] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
In type-2 diabetes (T2D), islet amyloid polypeptide (IAPP) self-associates into toxic assemblies causing islet β-cell death. Therefore, preventing IAPP toxicity is a promising therapeutic strategy for T2D. The molecular tweezer CLR01 is a supramolecular tool for selective complexation of K residues in (poly)peptides. Surprisingly, it inhibits IAPP aggregation at substoichiometric concentrations even though IAPP has only one K residue at position 1, whereas efficient inhibition of IAPP toxicity requires excess CLR01. The basis for this peculiar behavior is not clear. Here, a combination of biochemical, biophysical, spectroscopic, and computational methods reveals a detailed mechanistic picture of the unique dual inhibition mechanism for CLR01. At low concentrations, CLR01 binds to K1, presumably nucleating nonamyloidogenic, yet toxic, structures, whereas excess CLR01 binds also to R11, leading to nontoxic structures. Encouragingly, the CLR01 concentrations needed for inhibition of IAPP toxicity are safe in vivo, supporting its development toward disease-modifying therapy for T2D.
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Affiliation(s)
| | | | | | | | - Zhenming Du
- Department of Biology, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | | | - Som Dutt
- Institute of Organic Chemistry, University of Duisburg-Essen, 45141 Essen, Germany
| | - Heinz Bandmann
- Institute of Organic Chemistry, University of Duisburg-Essen, 45141 Essen, Germany
| | | | - Sumit Mittal
- Max-Planck-Institut für Kohlenforschung, 45470 Mülheim an der Ruhr, Germany
| | - Frank-Gerrit Klärner
- Institute of Organic Chemistry, University of Duisburg-Essen, 45141 Essen, Germany
| | - Chunyu Wang
- Department of Biology, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | | | - Thomas Schrader
- Institute of Organic Chemistry, University of Duisburg-Essen, 45141 Essen, Germany
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21
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Zlatic CO, Mao Y, Ryan TM, Mok YF, Roberts BR, Howlett GJ, Griffin MDW. Fluphenazine·HCl and Epigallocatechin Gallate Modulate the Rate of Formation and Structural Properties of Apolipoprotein C-II Amyloid Fibrils. Biochemistry 2015; 54:3831-8. [DOI: 10.1021/acs.biochem.5b00399] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Courtney O. Zlatic
- Department of Biochemistry and Molecular
Biology, Bio21 Molecular
Science and Biotechnology Institute, ‡The Florey Institute of Neuroscience and Mental
Health, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Yu Mao
- Department of Biochemistry and Molecular
Biology, Bio21 Molecular
Science and Biotechnology Institute, ‡The Florey Institute of Neuroscience and Mental
Health, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Timothy M. Ryan
- Department of Biochemistry and Molecular
Biology, Bio21 Molecular
Science and Biotechnology Institute, ‡The Florey Institute of Neuroscience and Mental
Health, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Yee-Foong Mok
- Department of Biochemistry and Molecular
Biology, Bio21 Molecular
Science and Biotechnology Institute, ‡The Florey Institute of Neuroscience and Mental
Health, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Blaine R. Roberts
- Department of Biochemistry and Molecular
Biology, Bio21 Molecular
Science and Biotechnology Institute, ‡The Florey Institute of Neuroscience and Mental
Health, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Geoffrey J. Howlett
- Department of Biochemistry and Molecular
Biology, Bio21 Molecular
Science and Biotechnology Institute, ‡The Florey Institute of Neuroscience and Mental
Health, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Michael D. W. Griffin
- Department of Biochemistry and Molecular
Biology, Bio21 Molecular
Science and Biotechnology Institute, ‡The Florey Institute of Neuroscience and Mental
Health, The University of Melbourne, Parkville, Victoria 3010, Australia
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22
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Nasica-Labouze J, Nguyen PH, Sterpone F, Berthoumieu O, Buchete NV, Coté S, De Simone A, Doig AJ, Faller P, Garcia A, Laio A, Li MS, Melchionna S, Mousseau N, Mu Y, Paravastu A, Pasquali S, Rosenman DJ, Strodel B, Tarus B, Viles JH, Zhang T, Wang C, Derreumaux P. Amyloid β Protein and Alzheimer's Disease: When Computer Simulations Complement Experimental Studies. Chem Rev 2015; 115:3518-63. [PMID: 25789869 DOI: 10.1021/cr500638n] [Citation(s) in RCA: 478] [Impact Index Per Article: 53.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Jessica Nasica-Labouze
- †Laboratoire de Biochimie Théorique, Institut de Biologie Physico-Chimique (IBPC), UPR9080 CNRS, Université Paris Diderot, Sorbonne Paris Cité, 13 rue Pierre et Marie Curie, 75005 Paris, France
| | - Phuong H Nguyen
- †Laboratoire de Biochimie Théorique, Institut de Biologie Physico-Chimique (IBPC), UPR9080 CNRS, Université Paris Diderot, Sorbonne Paris Cité, 13 rue Pierre et Marie Curie, 75005 Paris, France
| | - Fabio Sterpone
- †Laboratoire de Biochimie Théorique, Institut de Biologie Physico-Chimique (IBPC), UPR9080 CNRS, Université Paris Diderot, Sorbonne Paris Cité, 13 rue Pierre et Marie Curie, 75005 Paris, France
| | - Olivia Berthoumieu
- ‡LCC (Laboratoire de Chimie de Coordination), CNRS, Université de Toulouse, Université Paul Sabatier (UPS), Institut National Polytechnique de Toulouse (INPT), 205 route de Narbonne, BP 44099, Toulouse F-31077 Cedex 4, France
| | | | - Sébastien Coté
- ∥Département de Physique and Groupe de recherche sur les protéines membranaires (GEPROM), Université de Montréal, C.P. 6128, succursale Centre-ville, Montréal, Québec H3C 3T5, Canada
| | - Alfonso De Simone
- ⊥Department of Life Sciences, Imperial College London, London SW7 2AZ, United Kingdom
| | - Andrew J Doig
- #Manchester Institute of Biotechnology, University of Manchester, 131 Princess Street, Manchester M1 7DN, United Kingdom
| | - Peter Faller
- ‡LCC (Laboratoire de Chimie de Coordination), CNRS, Université de Toulouse, Université Paul Sabatier (UPS), Institut National Polytechnique de Toulouse (INPT), 205 route de Narbonne, BP 44099, Toulouse F-31077 Cedex 4, France
| | | | - Alessandro Laio
- ○The International School for Advanced Studies (SISSA), Via Bonomea 265, 34136 Trieste, Italy
| | - Mai Suan Li
- ◆Institute of Physics, Polish Academy of Sciences, Al. Lotnikow 32/46, 02-668 Warsaw, Poland.,¶Institute for Computational Science and Technology, SBI Building, Quang Trung Software City, Tan Chanh Hiep Ward, District 12, Ho Chi Minh City, Vietnam
| | - Simone Melchionna
- ⬠Instituto Processi Chimico-Fisici, CNR-IPCF, Consiglio Nazionale delle Ricerche, 00185 Roma, Italy
| | | | - Yuguang Mu
- ▲School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, 637551 Singapore
| | - Anant Paravastu
- ⊕National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, United States
| | - Samuela Pasquali
- †Laboratoire de Biochimie Théorique, Institut de Biologie Physico-Chimique (IBPC), UPR9080 CNRS, Université Paris Diderot, Sorbonne Paris Cité, 13 rue Pierre et Marie Curie, 75005 Paris, France
| | | | - Birgit Strodel
- △Institute of Complex Systems: Structural Biochemistry (ICS-6), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - Bogdan Tarus
- †Laboratoire de Biochimie Théorique, Institut de Biologie Physico-Chimique (IBPC), UPR9080 CNRS, Université Paris Diderot, Sorbonne Paris Cité, 13 rue Pierre et Marie Curie, 75005 Paris, France
| | - John H Viles
- ▼School of Biological and Chemical Sciences, Queen Mary University of London, London E1 4NS, United Kingdom
| | - Tong Zhang
- †Laboratoire de Biochimie Théorique, Institut de Biologie Physico-Chimique (IBPC), UPR9080 CNRS, Université Paris Diderot, Sorbonne Paris Cité, 13 rue Pierre et Marie Curie, 75005 Paris, France.,▲School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, 637551 Singapore
| | | | - Philippe Derreumaux
- †Laboratoire de Biochimie Théorique, Institut de Biologie Physico-Chimique (IBPC), UPR9080 CNRS, Université Paris Diderot, Sorbonne Paris Cité, 13 rue Pierre et Marie Curie, 75005 Paris, France.,□Institut Universitaire de France, 75005 Paris, France
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23
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Smaoui MR, Orland H, Waldispühl J. Probing the binding affinity of amyloids to reduce toxicity of oligomers in diabetes. Bioinformatics 2015; 31:2294-302. [PMID: 25777526 DOI: 10.1093/bioinformatics/btv143] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Accepted: 03/08/2015] [Indexed: 11/13/2022] Open
Abstract
MOTIVATION Amyloids play a role in the degradation of β-cells in diabetes patients. In particular, short amyloid oligomers inject themselves into the membranes of these cells and create pores that disrupt the strictly controlled flow of ions through the membranes. This leads to cell death. Getting rid of the short oligomers either by a deconstruction process or by elongating them into longer fibrils will reduce this toxicity and allow the β-cells to live longer. RESULTS We develop a computational method to probe the binding affinity of amyloid structures and produce an amylin analog that binds to oligomers and extends their length. The binding and extension lower toxicity and β-cell death. The amylin analog is designed through a parsimonious selection of mutations and is to be administered with the pramlintide drug, but not to interact with it. The mutations (T9K L12K S28H T30K) produce a stable native structure, strong binding affinity to oligomers, and long fibrils. We present an extended mathematical model for the insulin-glucose relationship and demonstrate how affecting the concentration of oligomers with such analog is strictly coupled with insulin release and β-cell fitness. AVAILABILITY AND IMPLEMENTATION SEMBA, the tool to probe the binding affinity of amyloid proteins and generate the binding affinity scoring matrices and R-scores is available at: http://amyloid.cs.mcgill.ca
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Affiliation(s)
- Mohamed Raef Smaoui
- School of Computer Science and McGill Center for Bioinformatics, McGill University, Montreal, QC, Canada and
| | - Henri Orland
- Institut de Physique Théorique, CEA-Saclay, 91191 Gif/Yvette Cedex, France
| | - Jérôme Waldispühl
- School of Computer Science and McGill Center for Bioinformatics, McGill University, Montreal, QC, Canada and
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24
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BI WEI, ZHU LIHONG, JING XIUNA, ZENG ZHIFEN, LIANG YANRAN, XU ANDING, LIU JUN, XIAO SONGHUA, YANG LIANHONG, SHI QIAOYUN, GUO LI, TAO ENXIANG. Rifampicin improves neuronal apoptosis in LPS-stimulated co‑cultured BV2 cells through inhibition of the TLR-4 pathway. Mol Med Rep 2014; 10:1793-9. [PMID: 25119251 PMCID: PMC4148376 DOI: 10.3892/mmr.2014.2480] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2013] [Accepted: 07/01/2014] [Indexed: 11/06/2022] Open
Abstract
Agents inhibiting microglial activation are attracting attention as candidate drugs for neuroprotection in neurodegenerative diseases. Recently, researchers have focused on the immunosuppression induced by rifampicin. Our previous study showed that rifampicin inhibits the production of lipopolysaccharide (LPS)-induced pro-inflammatory mediators and improves neuron survival in inflammation; however, the mechanism through which rifampicin inhibits microglial inflammation and its neuroprotective effects are not completely understood. In this study, we examined the effects of rifampicin on morphological changes induced by LPS in murine microglial BV2 cells. Then we investigated, in BV2 microglia, the effects of rifampicin on two signaling pathway componentss stimulated by LPS, the Toll‑like receptor-4 (TLR-4) and the nuclear factor-κB (NF-κB). In addition, we co-cultured BV2 microglia and neurons to observe the indirect neuroprotective effects of rifampicin. Rifampicin inhibited LPS-stimulated expression of the TLR-4 gene. When neurons were co-cultured with LPS-stimulated BV2 microglia, pre-treatment with rifampicin increased neuronal viability and reduced the number of apoptotic cells. Taken together, these findings suggest that rifampicin, with its anti-inflammatory properties, may be a promising agent for the treatment of neurodegenerative diseases.
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Affiliation(s)
- WEI BI
- Department of Neurology, The First Affiliated Hospital of Jinan University, Guangzhou, Guangdong 510632, P.R. China
| | - LIHONG ZHU
- Department of Pathophysiology, Institute of Brain Research, School of Medicine, Jinan University, Guangzhou, Guangdong 510632, P.R. China
| | - XIUNA JING
- Department of Neurology, Sun Yat-sen Memorial Hospital of Sun Yat-sen University, Guangzhou, Guangdong 510120, P.R. China
| | - ZHIFEN ZENG
- Department of Neurology, Sun Yat-sen Memorial Hospital of Sun Yat-sen University, Guangzhou, Guangdong 510120, P.R. China
| | - YANRAN LIANG
- Department of Neurology, Sun Yat-sen Memorial Hospital of Sun Yat-sen University, Guangzhou, Guangdong 510120, P.R. China
| | - ANDING XU
- Department of Neurology, The First Affiliated Hospital of Jinan University, Guangzhou, Guangdong 510632, P.R. China
| | - JUN LIU
- Department of Neurology, Sun Yat-sen Memorial Hospital of Sun Yat-sen University, Guangzhou, Guangdong 510120, P.R. China
| | - SONGHUA XIAO
- Department of Neurology, Sun Yat-sen Memorial Hospital of Sun Yat-sen University, Guangzhou, Guangdong 510120, P.R. China
| | - LIANHONG YANG
- Department of Neurology, Sun Yat-sen Memorial Hospital of Sun Yat-sen University, Guangzhou, Guangdong 510120, P.R. China
| | - QIAOYUN SHI
- Center for Inherited Cardiovascular Disease, Division of Cardiovascular Medicine, Stanford University, School of Medicine, Stanford, CA 94304, USA
| | - LI GUO
- Department of Neurology, The First Affiliated Hospital of Jinan University, Guangzhou, Guangdong 510632, P.R. China
| | - ENXIANG TAO
- Department of Neurology, Sun Yat-sen Memorial Hospital of Sun Yat-sen University, Guangzhou, Guangdong 510120, P.R. China
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25
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RIFAMPICIN: an antibiotic with brain protective function. Brain Res Bull 2014; 107:37-42. [PMID: 24905548 DOI: 10.1016/j.brainresbull.2014.05.007] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2014] [Revised: 05/08/2014] [Accepted: 05/27/2014] [Indexed: 11/22/2022]
Abstract
Besides its well known antibiotic activity rifampicin exerts multiple brain protective functions in acute cerebral ischemia and chronic neurodegeneration. The present mini-review gives an update of the unique activity of rifampicin in different diseases including Parkinson's disease, meningitis, stroke, Alzheimer's disease and optic nerve injury.
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26
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Abstract
Amylin is a peptide that aggregates into species that are toxic to pancreatic beta cells, leading to type II diabetes. This study has for the first time quantified amylin association and dissociation kinetics (association constant (ka ) = 28.7 ± 5.1 L mol-1 s-1 and dissociation constant (kd ) = 2.8 ± 0.6 ×10-4 s-1) using surface plasmon resonance (SPR). Thus far, techniques used for the sizing of amylin aggregates do not cater for the real-time monitoring of unconstrained amylin in solution. In this regard we evaluated recently innovated nanoparticle tracking analysis (NTA). In addition, both SPR and NTA were used to study the effect of previously synthesized amylin derivatives on amylin aggregation and to evaluate their potential as a cell-free system for screening potential inhibitors of amylin-mediated cytotoxicity. Results obtained from NTA highlighted a predominance of 100-300 nm amylin aggregates and correlation to previously published cytotoxicity results suggests the toxic species of amylin to be 200-300 nm in size. The results seem to indicate that NTA has potential as a new technique to monitor the aggregation potential of amyloid peptides in solution and also to screen potential inhibitors of amylin-mediated cytotoxicity.
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Affiliation(s)
- Karen Pillay
- Department of Biochemistry, School of Life Sciences, University of KwaZulu-Natal, Durban, South Africa
| | - Patrick Govender
- Department of Biochemistry, School of Life Sciences, University of KwaZulu-Natal, Durban, South Africa
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27
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Pillay K, Govender P. A direct fluorescence-based technique for cellular localization of amylin. Biotechnol Appl Biochem 2013; 60:384-92. [DOI: 10.1002/bab.1113] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2012] [Accepted: 03/11/2013] [Indexed: 01/03/2023]
Affiliation(s)
- Karen Pillay
- School of Life Sciences; University of KwaZulu-Natal; South Africa
| | - Patrick Govender
- School of Life Sciences; University of KwaZulu-Natal; South Africa
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28
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Romero D, Sanabria-Valentín E, Vlamakis H, Kolter R. Biofilm inhibitors that target amyloid proteins. ACTA ACUST UNITED AC 2013; 20:102-10. [PMID: 23352144 DOI: 10.1016/j.chembiol.2012.10.021] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2012] [Revised: 10/25/2012] [Accepted: 10/29/2012] [Indexed: 11/16/2022]
Abstract
Bacteria establish stable communities, known as biofilms, that are resistant to antimicrobials. Biofilm robustness is due to the presence of an extracellular matrix, which for several species-among them Bacillus subtilis-includes amyloid-like protein fibers. In this work, we show that B. subtilis biofilms can be a simple and reliable tool for screening of molecules with antiamyloid activity. We identified two molecules, AA-861 and parthenolide, which efficiently inhibited biofilms by preventing the formation of amyloid-like fibers. Parthenolide also disrupted pre-established biofilms. These molecules also impeded the formation of biofilms of other bacterial species that secrete amyloid proteins, such as Bacillus cereus and Escherichia coli. Furthermore, the identified molecules decreased the conversion of the yeast protein New1 to the prion state in a heterologous host, indicating the broad range of activity of the molecules.
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Affiliation(s)
- Diego Romero
- Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA 02115, USA
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29
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Amylin uncovered: a review on the polypeptide responsible for type II diabetes. BIOMED RESEARCH INTERNATIONAL 2013; 2013:826706. [PMID: 23607096 PMCID: PMC3626316 DOI: 10.1155/2013/826706] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/11/2012] [Accepted: 02/21/2013] [Indexed: 11/17/2022]
Abstract
Amylin is primarily responsible for classifying type II diabetes as an amyloid (protein misfolding) disease as it has great potential to aggregate into toxic nanoparticles, thereby resulting in loss of pancreatic β-cells. Although type II diabetes is on the increase each year, possibly due to bad eating habits of modern society, research on the culprit for this disease is still in its early days. In addition, unlike the culprit for Alzheimer's disease, amyloid β-peptide, amylin has failed to receive attention worthy of being featured in an abundance of review articles. Thus, the aim of this paper is to shine the spotlight on amylin in an attempt to put it onto the top of researchers' to-do list since the secondary complications of type II diabetes have far-reaching and severe consequences on public health both in developing and fully developed countries alike. This paper will cover characteristics of the amylin aggregates, mechanisms of toxicity, and a particular focus on inhibitors of toxicity and techniques used to assess these inhibitors.
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30
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Abstract
Rifampicin is a macrocyclic antibiotic used extensively for the treatment of Mycobacterium tuberculosis and other mycobacterial infections. Recently, it was discovered that rifampicin exhibits neuroprotective effects. It has been shown to protect PC12 cells against MPP(+)-induced apoptosis and inhibit the expression of α-synuclein multimers. In in vitro studies, rifampicin pretreatment protects PC12 cells against rotenone-induced cell death. Qualitative and quantitative analyses uncover that rifampicin significantly suppresses rotenone-induced apoptosis by ameliorating mitochondrial oxidative stress. It reduces microglial inflammation and improves neuron survival. Our results indicate that rifampicin is cytoprotective under a variety of experimental conditions, and suggest that it may be useful in PD therapeutics. It is the aim of this paper to review the experimental neuroprotection data reported using rifampicin with a focus on the molecular and cellular mechanisms of cytoprotective effect in in vitro models of PD.
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31
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Härd T, Lendel C. Inhibition of amyloid formation. J Mol Biol 2012; 421:441-65. [PMID: 22244855 DOI: 10.1016/j.jmb.2011.12.062] [Citation(s) in RCA: 215] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2011] [Revised: 12/28/2011] [Accepted: 12/29/2011] [Indexed: 12/26/2022]
Abstract
Amyloid is aggregated protein in the form of insoluble fibrils. Amyloid deposition in human tissue-amyloidosis-is associated with a number of diseases including all common dementias and type II diabetes. Considerable progress has been made to understand the mechanisms leading to amyloid formation. It is, however, not yet clear by which mechanisms amyloid and protein aggregates formed on the path to amyloid are cytotoxic. Strategies to prevent protein aggregation and amyloid formation are nevertheless, in many cases, promising and even successful. This review covers research on intervention of amyloidosis and highlights several examples of how inhibition of protein aggregation and amyloid formation has been achieved in practice. For instance, rational design can provide drugs that stabilize a native folded state of a protein, protein engineering can provide new binding proteins that sequester monomeric peptides from aggregation, small molecules and peptides can be designed to block aggregation or direct it into non-cytotoxic paths, and monoclonal antibodies have been developed for therapies towards neurodegenerative diseases based on inhibition of amyloid formation and clearance.
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Affiliation(s)
- Torleif Härd
- Department of Molecular Biology, Swedish University of Agricultural Sciences, SE-751 24 Uppsala, Sweden.
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32
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Abstract
Natural Products in the Drug Discovery Programmes in Alzheimer's: Impacts and Prospects. Advancement of chitosan based nanoparticles for present and future interests. Algal Tranformations for Enhanced Metabolite Production and Pathway Manipulation.
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33
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Wang M, JiJi RD. Resolution of localized small molecule–Aβ interactions by deep-ultraviolet resonance Raman spectroscopy. Biophys Chem 2011; 158:96-103. [DOI: 10.1016/j.bpc.2011.05.017] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2011] [Revised: 05/19/2011] [Accepted: 05/19/2011] [Indexed: 01/13/2023]
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Woods LA, Platt GW, Hellewell AL, Hewitt EW, Homans SW, Ashcroft AE, Radford SE. Ligand binding to distinct states diverts aggregation of an amyloid-forming protein. Nat Chem Biol 2011; 7:730-9. [PMID: 21873994 PMCID: PMC3182555 DOI: 10.1038/nchembio.635] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2011] [Accepted: 06/30/2011] [Indexed: 11/21/2022]
Abstract
Although small molecules that modulate amyloid formation in vitro have been identified, significant challenges remain in determining precisely how these species act. Here we describe the identification of rifamycin SV as a potent inhibitor of β(2) microglobulin (β(2)m) fibrillogenesis when added during the lag time of assembly or early during fibril elongation. Biochemical experiments demonstrate that the small molecule does not act by a colloidal mechanism. Exploiting the ability of electrospray ionization-ion mobility spectrometry-mass spectrometry (ESI-IMS-MS) to resolve intermediates of amyloid assembly, we show instead that rifamycin SV inhibits β(2)m fibrillation by binding distinct monomeric conformers, disfavoring oligomer formation and diverting the course of assembly to the formation of spherical aggregates. The results demonstrate the power of ESI-IMS-MS to identify specific protein conformers as targets for intervention in fibrillogenesis using small molecules and reveal a mechanism of action in which ligand binding diverts unfolded protein monomers toward alternative assembly pathways.
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Affiliation(s)
| | | | - Andrew L. Hellewell
- Astbury Centre for Structural Molecular Biology and Institute of Molecular and Cellular Biology, University of Leeds, Leeds, LS2 9JT, United Kingdom
| | - Eric W. Hewitt
- Astbury Centre for Structural Molecular Biology and Institute of Molecular and Cellular Biology, University of Leeds, Leeds, LS2 9JT, United Kingdom
| | - Steve W. Homans
- Astbury Centre for Structural Molecular Biology and Institute of Molecular and Cellular Biology, University of Leeds, Leeds, LS2 9JT, United Kingdom
| | - Alison E. Ashcroft
- Astbury Centre for Structural Molecular Biology and Institute of Molecular and Cellular Biology, University of Leeds, Leeds, LS2 9JT, United Kingdom
| | - Sheena E. Radford
- Astbury Centre for Structural Molecular Biology and Institute of Molecular and Cellular Biology, University of Leeds, Leeds, LS2 9JT, United Kingdom
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35
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Ortega A, Rincón Á, Jiménez-Aliaga KL, Bermejo-Bescós P, Martín-Aragón S, Molina MT, Csákÿ AG. Synthesis and evaluation of arylquinones as BACE1 inhibitors, β-amyloid peptide aggregation inhibitors, and destabilizers of preformed β-amyloid fibrils. Bioorg Med Chem Lett 2011; 21:2183-7. [PMID: 21441028 DOI: 10.1016/j.bmcl.2011.03.023] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2011] [Revised: 03/05/2011] [Accepted: 03/08/2011] [Indexed: 01/04/2023]
Abstract
BACE1 activity, inhibition of Aβ aggregation, and disaggregation of preformed Aβ fibrils constitute the three major targets in the development of small-molecule lipophilic new drugs for the treatment of Alzheimer's disease (AD). Quinones are widely distributed among natural products and possess relevant and varied biological activities including antitumor and antibiotic, inhibition of HIV-1 reverse transcriptase, antidiabetic, or COX-inhibition, among others. We report herein the interaction of several arylquinones and their derivatives with the amyloidogenic pathway of the amyloid precursor protein processing. Our studies put forward that these compounds are promising candidates in the development of new drugs which are effective simultaneously towards the three major targets of AD.
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Affiliation(s)
- Andrea Ortega
- Departamento de Farmacología, Facultad de Farmacia, Universidad Complutense, E28040 Madrid, Spain
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36
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Abstract
This review focuses on recent developments in the use of natural products as therapeutics for Alzheimer's disease. The compounds span a diverse array of structural classes and are organized according to their mechanism of action, with the focus primarily on the major hypotheses. Overall, the review discusses more than 180 compounds and summarizes 400 references.
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Affiliation(s)
- Philip Williams
- Department of Chemistry, University of Hawaii at Manoa, Honolulu, Hawaii 96822, USA
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37
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Hung YT, Lin MS, Chen WY, Wang SSS. Investigating the effects of sodium dodecyl sulfate on the aggregative behavior of hen egg-white lysozyme at acidic pH. Colloids Surf B Biointerfaces 2010; 81:141-51. [PMID: 20674294 DOI: 10.1016/j.colsurfb.2010.07.001] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2010] [Revised: 07/03/2010] [Accepted: 07/03/2010] [Indexed: 11/30/2022]
Abstract
The research presented here is aimed at examining the effects of sodium dodecyl sulfate on the aggregative behavior of hen egg-white lysozyme at pH 2.0. Through various spectroscopic techniques, dynamic light scattering, and electron microscopy, we first demonstrated that SDS exhibited a biphasic effect on lysozyme fibrillation. The presence of SDS at higher concentrations (e.g., 0.25, 5.00, or 20.00 mM SDS) was found to suppress fibril formation of lysozyme whereas fibrillogenic lysozyme-SDS ensemble containing beta-sheet-rich conformation was observed upon the addition of lower concentrations of SDS (e.g., 0.00, 0.06, or 0.1mM SDS). Next, our equilibrium urea-unfolding data revealed that lysozyme samples with higher SDS concentrations showed superior thermodynamic stabilities over the ones with no or lower levels of SDS. Finally, the correlation between SDS concentration and lysozyme aggregative/fibrillogenic propensity and the underlying interacting mechanism were further explored using surface tensiometry and isothermal titration calorimetry. We believe the outcome from this work may not only help decipher the molecular mechanism of amyloid fibrillation, but also shed light on a rational design of potential therapeutic strategies for amyloid pathology.
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Affiliation(s)
- Ying-Tz Hung
- Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan
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38
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Scherzer-Attali R, Pellarin R, Convertino M, Frydman-Marom A, Egoz-Matia N, Peled S, Levy-Sakin M, Shalev DE, Caflisch A, Gazit E, Segal D. Complete phenotypic recovery of an Alzheimer's disease model by a quinone-tryptophan hybrid aggregation inhibitor. PLoS One 2010; 5:e11101. [PMID: 20559435 PMCID: PMC2885425 DOI: 10.1371/journal.pone.0011101] [Citation(s) in RCA: 118] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2010] [Accepted: 05/20/2010] [Indexed: 11/29/2022] Open
Abstract
The rational design of amyloid oligomer inhibitors is yet an unmet drug development need. Previous studies have identified the role of tryptophan in amyloid recognition, association and inhibition. Furthermore, tryptophan was ranked as the residue with highest amyloidogenic propensity. Other studies have demonstrated that quinones, specifically anthraquinones, can serve as aggregation inhibitors probably due to the dipole interaction of the quinonic ring with aromatic recognition sites within the amyloidogenic proteins. Here, using in vitro, in vivo and in silico tools we describe the synthesis and functional characterization of a rationally designed inhibitor of the Alzheimer's disease-associated β-amyloid. This compound, 1,4-naphthoquinon-2-yl-L-tryptophan (NQTrp), combines the recognition capacities of both quinone and tryptophan moieties and completely inhibited Aβ oligomerization and fibrillization, as well as the cytotoxic effect of Aβ oligomers towards cultured neuronal cell line. Furthermore, when fed to transgenic Alzheimer's disease Drosophila model it prolonged their life span and completely abolished their defective locomotion. Analysis of the brains of these flies showed a significant reduction in oligomeric species of Aβ while immuno-staining of the 3rd instar larval brains showed a significant reduction in Aβ accumulation. Computational studies, as well as NMR and CD spectroscopy provide mechanistic insight into the activity of the compound which is most likely mediated by clamping of the aromatic recognition interface in the central segment of Aβ. Our results demonstrate that interfering with the aromatic core of amyloidogenic peptides is a promising approach for inhibiting various pathogenic species associated with amyloidogenic diseases. The compound NQTrp can serve as a lead for developing a new class of disease modifying drugs for Alzheimer's disease.
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Affiliation(s)
- Roni Scherzer-Attali
- Department of Molecular Microbiology and Biotechnology, Tel-Aviv University, Tel-Aviv, Israel
| | - Riccardo Pellarin
- Department of Biochemistry, University of Zurich, Zurich, Switzerland
| | - Marino Convertino
- Department of Biochemistry, University of Zurich, Zurich, Switzerland
| | - Anat Frydman-Marom
- Department of Molecular Microbiology and Biotechnology, Tel-Aviv University, Tel-Aviv, Israel
| | - Nirit Egoz-Matia
- Department of Molecular Microbiology and Biotechnology, Tel-Aviv University, Tel-Aviv, Israel
| | - Sivan Peled
- Department of Molecular Microbiology and Biotechnology, Tel-Aviv University, Tel-Aviv, Israel
| | - Michal Levy-Sakin
- Department of Molecular Microbiology and Biotechnology, Tel-Aviv University, Tel-Aviv, Israel
| | - Deborah E. Shalev
- Wolfson Centre for Applied Structural Biology, Hebrew University of Jerusalem, Jerusalem, Israel
| | - Amedeo Caflisch
- Department of Biochemistry, University of Zurich, Zurich, Switzerland
| | - Ehud Gazit
- Department of Molecular Microbiology and Biotechnology, Tel-Aviv University, Tel-Aviv, Israel
- * E-mail: (EG); (DS)
| | - Daniel Segal
- Department of Molecular Microbiology and Biotechnology, Tel-Aviv University, Tel-Aviv, Israel
- * E-mail: (EG); (DS)
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Zraika S, Hull RL, Verchere CB, Clark A, Potter KJ, Fraser PE, Raleigh DP, Kahn SE. Toxic oligomers and islet beta cell death: guilty by association or convicted by circumstantial evidence? Diabetologia 2010; 53:1046-56. [PMID: 20182863 PMCID: PMC3164873 DOI: 10.1007/s00125-010-1671-6] [Citation(s) in RCA: 144] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/24/2009] [Accepted: 12/04/2009] [Indexed: 12/31/2022]
Abstract
Type 2 diabetes is a progressive disease characterised by islet amyloid deposits in the majority of patients. Amyloid formation is considered a significant factor in deterioration of islet function and reduction in beta cell mass, and involves aggregation of monomers of the normally soluble beta cell peptide, human islet amyloid polypeptide (hIAPP) into oligomers, fibrils and, ultimately, mature amyloid deposits. Despite extensive in vitro studies, the process of hIAPP aggregation in vivo is poorly understood, though it is widely reported to promote cytotoxicity. Recently, studies have suggested that only the early stages of fibril assembly, and in particular small hIAPP oligomers, are responsible for beta cell cytotoxicity. This challenges the prior concept that newly formed fibrils and/or mature fibrillar amyloid are cytotoxic. Herein, evidence both for and against the toxic hIAPP oligomer hypothesis is presented; from this, it is apparent that what exactly causes beta cell death when hIAPP aggregates remains debatable. Moreover, substantially more work with more specific reagents and techniques than are currently available will be required to identify conclusively the toxic species resulting from hIAPP aggregation. Keeping an open mind on the nature of the cytotoxic insult has implications for therapeutic developments and clinical care in type 2 diabetes.
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Affiliation(s)
- S Zraika
- Division of Metabolism, Endocrinology and Nutrition, Department of Medicine, VA Puget Sound Health Care System and University of Washington, 1660 South Columbian Way (151), Seattle, WA 98108, USA.
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40
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Marek P, Mukherjee S, Zanni MT, Raleigh DP. Residue-specific, real-time characterization of lag-phase species and fibril growth during amyloid formation: a combined fluorescence and IR study of p-cyanophenylalanine analogs of islet amyloid polypeptide. J Mol Biol 2010; 400:878-88. [PMID: 20630475 DOI: 10.1016/j.jmb.2010.05.041] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2010] [Revised: 05/05/2010] [Accepted: 05/16/2010] [Indexed: 01/09/2023]
Abstract
Amyloid formation normally exhibits a lag phase followed by a growth phase, which leads to amyloid fibrils. Characterization of the species populated during the lag phase is experimentally challenging, but is critical since the most toxic entities may be pre-fibrillar species. p-Cyanophenylalanine (F(C[triple bond]N)) fluorescence is used to probe the nature of lag-phase species populated during the formation of amyloid by human islet amyloid polypeptide. The polypeptide contains two phenylalanines at positions 15 and 23 and a single tyrosine located at the C-terminus. Each aromatic residue was separately replaced by F(C[triple bond]N). The substitutions do not perturb amyloid formation relative to wild-type islet amyloid polypeptide as detected using thioflavin T fluorescence and electron microscopy. F(C[triple bond]N) fluorescence is high when the cyano group is hydrogen bonded and low when it is not. It can also be quenched via Förster resonance energy transfer to tyrosine. Fluorescence intensity was monitored in real time and revealed that all three positions remained exposed to solvent during the lag phase but less exposed than unstructured model peptides. The time course of amyloid formation as monitored by thioflavin T fluorescence and F(C[triple bond]N) fluorescence is virtually identical. Fluorescence quenching experiments confirmed that each residue remains exposed during the lag phase. These results place significant constraints on the nature of intermediates that are populated during the lag phase and indicate that significant sequestering of the aromatic side chains does not occur until beta-structure sufficient to bind thioflavin T has developed. Seeding studies and analysis of maximum rates confirm that sequestering of the cyano groups occurs concomitantly with the development of thioflavin T binding capability. Overall, the process of amyloid formation and growth appears to be remarkably homogenous in terms of side-chain ordering. F(C[triple bond]N) also provides information about fibril structure. Fluorescence emission measurements, infrared measurements, and quenching studies indicate that the aromatic residues are differentially exposed in the fibril state with Phe15 being the most exposed. F(C[triple bond]N) is readily accommodated into proteins; thus, the approach should be broadly applicable.
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Affiliation(s)
- Peter Marek
- Department of Chemistry, State University of New York at Stony Brook, Stony Brook, NY 11794-3400, USA
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41
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Wang SSS, Liu KN, Han TC. Amyloid fibrillation and cytotoxicity of insulin are inhibited by the amphiphilic surfactants. Biochim Biophys Acta Mol Basis Dis 2010; 1802:519-30. [PMID: 20176106 DOI: 10.1016/j.bbadis.2010.02.008] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2009] [Revised: 01/30/2010] [Accepted: 02/16/2010] [Indexed: 11/26/2022]
Abstract
Amyloid fibrils have been associated with at least 25 different degenerative diseases. The 51-residue polypeptide hormone insulin, which is associated with type II diabetes, has been shown to self-assemble to form amyloid fibrils in vitro. With bovine insulin as a model, the research presented here explores the effects of two amphiphilic surfactants (1,2-dihexanoyl-sn-glycero-3-phosphocholine (di-C7-PC) and 1,2-diheptanoyl-sn-glycero-3-phosphocholine (di-C7-PC)) on the in vitro fibrillation process of bovine insulin at pH 2.0 and 55 degrees C. We demonstrated that insulin fibrillation may be inhibited by both surfactants in a dose-dependent fashion. The best inhibition of fibril formation is observed when insulin is incubated with 4mM di-C7-PC. Moreover, the addition of either surfactant at the concentrations studied attenuated insulin fibril-induced cytotoxicity in both PC12 and SH-SY5Y cell lines. The results from this work may contribute to the understanding of the molecular factors affecting amyloid fibrillation and the molecular mechanism(s) of the interactions between the membrane and amyloid proteins.
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Affiliation(s)
- Steven S-S Wang
- Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan.
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42
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Design and study of peptide-based inhibitors of amylin cytotoxicity. Bioorg Med Chem Lett 2010; 20:1360-2. [DOI: 10.1016/j.bmcl.2010.01.004] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2009] [Revised: 12/25/2009] [Accepted: 01/04/2010] [Indexed: 11/22/2022]
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43
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Uversky VN, Eliezer D. Biophysics of Parkinson's disease: structure and aggregation of alpha-synuclein. Curr Protein Pept Sci 2009; 10:483-99. [PMID: 19538146 PMCID: PMC3786709 DOI: 10.2174/138920309789351921] [Citation(s) in RCA: 244] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2009] [Accepted: 02/05/2009] [Indexed: 12/21/2022]
Abstract
Parkinson's disease (PD) is a slowly progressive movement disorder that results from the loss of dopaminergic neurons in the substantia nigra, a small area of cells in the mid-brain. PD is a multifactorial disorder with unknown etiology, in which both genetic and environmental factors play important roles. Substantial evidence links alpha-synuclein, a small highly conserved presynaptic protein with unknown function, to both familial and sporadic PD. Rare familial cases of PD are associated with missense point mutations in alpha-synuclein, or with the hyper-expression of the wild type protein due to its gene duplication/triplication. Furthermore, alpha-synuclein was identified as the major component of amyloid fibrils found in Lewy body and Lewy neurites, the characteristic proteinaceous deposits that are the diagnostic hallmarks of PD. alpha-Synuclein is abundant in various regions of the brain and has two closely related homologs, beta-synuclein and gamma-synuclein. When isolated in solution, the protein is intrinsically disordered, but in the presence of lipid surfaces alpha-synuclein adopts a highly helical structure that is believed to mediate its normal function(s). A number of different conformational states of alpha-synuclein have been observed. Besides the membrane-bound form, other critical conformations include a partially-folded state that is a key intermediate in aggregation and fibrillation, various oligomeric species, and fibrillar and amorphous aggregates. A number of intrinsic and extrinsic factors that either accelerate or inhibit the rate of alpha-synuclein aggregation and fibrillation in vitro are known. There is a strong correlation between the conformation of alpha-synuclein (induced by various factors) and its rate of fibrillation. The aggregation process appears to be branched, with one pathway leading to fibrils and another to oligomeric intermediates that may ultimately form amorphous deposits. The molecular basis of Parkinson's disease appears to be tightly coupled to the aggregation of alpha-synuclein and the factors that affect its conformation. This review focuses on the contributions of Prof. Anthony L. Fink to the field and presents some recent developments in this exciting area.
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Affiliation(s)
- Vladimir N. Uversky
- Institite for Intrinsically Disordered Protein Research, Center for Computational Biology and Bioinformatics, Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
- Institute for Biological Instrumentation, Russian Academy of Sciences, 142290 Pushchino, Moscow Region, Russia
| | - David Eliezer
- Department of Biochemistry and Program in Structural Biology, Weill Cornell Medical College, New York, New York 10021, USA
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Convertino M, Pellarin R, Catto M, Carotti A, Caflisch A. 9,10-Anthraquinone hinders beta-aggregation: how does a small molecule interfere with Abeta-peptide amyloid fibrillation? Protein Sci 2009; 18:792-800. [PMID: 19309732 DOI: 10.1002/pro.87] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Amyloid aggregation is linked to a number of neurodegenerative syndromes, the most prevalent one being Alzheimer's disease. In this pathology, the beta-amyloid peptides (Abeta) aggregate into oligomers, protofibrils, and fibrils and eventually into plaques, which constitute the characteristic hallmark of Alzheimer's disease. Several low-molecular-weight compounds able to impair the Abeta aggregation process have been recently discovered; yet, a detailed description of their interactions with oligomers and fibrils is hitherto missing. Here, molecular dynamics simulations are used to investigate the influence of two relatively similar tricyclic, planar compounds, that is, 9, 10-anthraquinone (AQ) and anthracene (AC), on the early phase of the aggregation of the Abeta heptapeptide segment H(14)QKLVFF(20), the hydrophobic stretch that promotes the Abeta self-assembly. The simulations show that AQ interferes with beta-sheet formation more than AC. In particular, AQ intercalates into the beta-sheet because polar interactions between the compound and the peptide backbone destabilize the interstrand hydrogen bonds, thereby favoring disorder. The thioflavin T-binding assay indicates that AQ, but not AC, sensibly reduces the amount of aggregated Abeta(1-40) peptide. Taken together, the in silico and in vitro results provide evidence that structural perturbations by AQ can remarkably affect ordered oligomerization. Moreover, the simulations shed light at the atomic level on the interactions between AQ and Abeta oligomers, providing useful insights for the design of small-molecule inhibitors of aggregation with therapeutic potential in Alzheimer's disease.
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Affiliation(s)
- Marino Convertino
- Department of Biochemistry, University of Zurich, CH-8057 Zurich, Switzerland
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Effect of curcumin on the amyloid fibrillogenesis of hen egg-white lysozyme. Biophys Chem 2009; 144:78-87. [PMID: 19632028 DOI: 10.1016/j.bpc.2009.06.010] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2009] [Revised: 06/25/2009] [Accepted: 06/27/2009] [Indexed: 01/15/2023]
Abstract
At least twenty human proteins can fold abnormally to form pathological deposits that are associated with several degenerative diseases. Despite extensive investigation on amyloid fibrillogenesis, its detailed molecular mechanisms remain unknown. This study is aimed at exploring the inhibitory activity of curcumin against the fibrillation of hen lysozyme. We found that the formation of amyloid fibrils at pH 2.0 in vitro was inhibited by curcumin in a dose-dependent manner. Moreover, quenching analysis confirmed the existence of an interaction between curcumin and lysozyme, and Van't Hoff analysis indicated that the curcumin-lysozyme interaction is predominantly governed by Van Der Waals force or hydrogen bonding. Curcumin was also found to acquire disaggregating ability on preformed lysozyme fibrils. Finally, we observed that curcumin pre-incubated at 25 degrees C for at least 7 days inhibited lysozyme fibrillogenesis better than untreated curcumin and the enhanced inhibition against HEWL fibrillation might be attributed to the presence of dimeric species.
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Lieu VH, Wu JW, Wang SSS, Wu CH. Inhibition of Amyloid Fibrillization of Hen Egg-White Lysozymes by Rifampicin and p-Benzoquinone. Biotechnol Prog 2008; 23:698-706. [PMID: 17492832 DOI: 10.1021/bp060353n] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
It has been reported that more than 20 different human proteins can fold abnormally, resulting in the formation of pathological deposits and several lethal degenerative diseases. Despite extensive investigations on amyloid fibril formation, the detailed molecular mechanism remained rather elusive. The current research, utilizing hen egg-white lysozymes as a model system, is aimed at exploring inhibitory activities of two potential molecules against lysozyme fibril formation. We first demonstrated that the formation of lysozyme amyloid fibrils at pH 2.0 was markedly enhanced by the presence of agitation in comparison with its quiescent counterpart. Next, via numerous spectroscopic techniques and transmission electron microscopy, our results revealed that the inhibition of lysozyme amyloid formation by either rifampicin or its analogue p-benzoquinone followed a concentration-dependent fashion. Furthermore, while both inhibitors were shown to acquire an anti-aggregating and a disaggregating activity, rifampicin, in comparison with p-benzoquinone, served as a more effective inhibitor against in vitro amyloid fibrillogenesis of lysozyme. It is our belief that the data reported in this work will not only reinforce the findings validated by others that rifampicin and p-benzoquinone serve as two promising preventive molecules against amyloid fibrillogenesis, but also shed light on a rational design of effective therapeutics for amyloidogenic diseases.
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Affiliation(s)
- Valerie H Lieu
- Department of Chemical Engineering National Taiwan University, Taipei 10617, Taiwan
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Marek P, Gupta R, Raleigh DP. The fluorescent amino acid p-cyanophenylalanine provides an intrinsic probe of amyloid formation. Chembiochem 2008; 9:1372-4. [PMID: 18478525 DOI: 10.1002/cbic.200800052] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Peter Marek
- Department of Chemistry, State University of New York, Stony Brook, NY 11794-3400, USA
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Meng F, Marek P, Potter KJ, Verchere CB, Raleigh DP. Rifampicin does not prevent amyloid fibril formation by human islet amyloid polypeptide but does inhibit fibril thioflavin-T interactions: implications for mechanistic studies of beta-cell death. Biochemistry 2008; 47:6016-24. [PMID: 18457428 DOI: 10.1021/bi702518m] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Amyloid formation has been implicated in more than 20 different human diseases, including Alzheimer's disease, Parkinson's disease, and type 2 diabetes. The development of inhibitors of amyloid is a topic of considerable interest, both because of their potential therapeutic applications and because they are useful mechanistic probes. Recent studies have highlighted the potential use of rifampicin as an inhibitor of amyloid formation by a variety of polypeptides; however, there are conflicting reports on its ability to inhibit amyloid formation by islet amyloid polypeptide (IAPP). IAPP is the cause of islet amyloid in type 2 diabetes. We show that rifampicin does not prevent amyloid formation by IAPP and does not disaggregate preformed IAPP amyloid fibrils;, instead, it interferes with standard fluorescence-based assays of amyloid formation. Rifampicin is unstable in aqueous solution and is readily oxidized. However, the effects of oxidized and reduced rifampicin are similar, in that neither prevents amyloid formation by IAPP. Furthermore, use of a novel p-cyanoPhe analogue of IAPP shows that rifampicin does not significantly affect the kinetics of IAPP amyloid formation. The implications for the development of amyloid inhibitors are discussed as are the implications for studies of the toxicity of islet amyloid. The work also demonstrates the utility of p-cyanoPhe IAPP for the screening of inhibitors. The data indicate that rifampicin cannot be used to test the relative toxicity of IAPP fibrils and prefibril aggregates of IAPP.
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Affiliation(s)
- Fanling Meng
- Department of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794-3400, USA
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Wang SSS, Wu JW, Yamamoto S, Liu HS. Diseases of protein aggregation and the hunt for potential pharmacological agents. Biotechnol J 2008; 3:165-92. [DOI: 10.1002/biot.200700065] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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Luca S, Yau WM, Leapman R, Tycko R. Peptide conformation and supramolecular organization in amylin fibrils: constraints from solid-state NMR. Biochemistry 2007; 46:13505-22. [PMID: 17979302 DOI: 10.1021/bi701427q] [Citation(s) in RCA: 503] [Impact Index Per Article: 29.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The 37-residue amylin peptide, also known as islet amyloid polypeptide, forms fibrils that are the main peptide or protein component of amyloid that develops in the pancreas of type 2 diabetes patients. Amylin also readily forms amyloid fibrils in vitro that are highly polymorphic under typical experimental conditions. We describe a protocol for the preparation of synthetic amylin fibrils that exhibit a single predominant morphology, which we call a striated ribbon, in electron microscopy and atomic force microscopy images. Solid-state nuclear magnetic resonance (NMR) measurements on a series of isotopically labeled samples indicate a single molecular structure within the striated ribbons. We use scanning transmission electron microscopy and several types of one- and two-dimensional solid-state NMR techniques to obtain constraints on the peptide conformation and supramolecular structure in these amylin fibrils and to derive molecular structural models that are consistent with the experimental data. The basic structural unit in amylin striated ribbons, which we call the protofilament, contains four layers of parallel beta-sheets, formed by two symmetric layers of amylin molecules. The molecular structure of amylin protofilaments in striated ribbons closely resembles the protofilament in amyloid fibrils with a similar morphology formed by the 40-residue beta-amyloid peptide that is associated with Alzheimer's disease.
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Affiliation(s)
- Sorin Luca
- Laboratory of Chemical Physics, National Institute of Diabetes, Digestive, and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892-0520, USA
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