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Ashirbaev SS, Brás NF, Frei P, Liu K, Moser S, Zipse H. Redox-Mediated Amination of Pyrogallol-Based Polyphenols. Chemistry 2024; 30:e202303783. [PMID: 38029366 DOI: 10.1002/chem.202303783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2023] [Revised: 11/28/2023] [Accepted: 11/29/2023] [Indexed: 12/01/2023]
Abstract
Flavonoids are known to covalently modify amyloidogenic peptides by amination reactions. The underlying coupling process between polyphenols and N-nucleophiles is assessed by several in vitro and in silico approaches. The coupling reaction involves a sequence of oxidative dearomatization, amination, and reductive amination (ODARA) reaction steps. The C6-regioselectivity of the product is confirmed by crystallographic analysis. Under aqueous conditions, the reaction of baicalein with lysine derivatives yields C-N coupling as well as hydrolysis products of transient imine intermediates. The observed C-N coupling reactions work best for flavonoids combining a pyrogallol substructure with an electron-withdrawing group attached to the C4a-position. Thermodynamic properties such as bond dissociation energies also highlight the key role of pyrogallol units for the antioxidant ability. Combining the computed electronic properties and in vitro antioxidant assays suggests that the studied pyrogallol-containing flavonoids act by various radical-scavenging mechanisms working in synergy. Multivariate analysis indicates that a small number of descriptors for transient intermediates of the ODARA process generates a model with excellent performance (r=0.93) for the prediction of cross-coupling yields. The same model has been employed to predict novel antioxidant flavonoid-based molecules as potential covalent inhibitors, opening a new avenue to the design of therapeutically relevant anti-amyloid compounds.
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Affiliation(s)
- Salavat S Ashirbaev
- Department of Chemistry, Ludwig Maximilian University of Munich, Butenandtstraße 5-13, 81377, Munich, Germany
| | - Natércia F Brás
- Department of Chemistry, Ludwig Maximilian University of Munich, Butenandtstraße 5-13, 81377, Munich, Germany
- LAQV, REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre s/n, 4169-007, Porto, Portugal
| | - Patricia Frei
- Department of Pharmacy, Ludwig Maximilian University of Munich, Butenandtstraße 5-13, 81377, Munich, Germany
| | - Kuangjie Liu
- Department of Chemistry, Ludwig Maximilian University of Munich, Butenandtstraße 5-13, 81377, Munich, Germany
| | - Simone Moser
- Institute of Pharmacy, University of Innsbruck, Innrain 80-13, 6020, Innsbruck, Austria
| | - Hendrik Zipse
- Department of Chemistry, Ludwig Maximilian University of Munich, Butenandtstraße 5-13, 81377, Munich, Germany
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2
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Le NTK, Kang EJ, Park JH, Kang K. Catechol-Amyloid Interactions. Chembiochem 2023; 24:e202300628. [PMID: 37850717 DOI: 10.1002/cbic.202300628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Revised: 10/17/2023] [Accepted: 10/18/2023] [Indexed: 10/19/2023]
Abstract
This review introduces multifaceted mutual interactions between molecules containing a catechol moiety and aggregation-prone proteins. The complex relationships between these two molecular species have previously been elucidated primarily in a unidirectional manner, as demonstrated in cases involving the development of catechol-based inhibitors for amyloid aggregation and the elucidation of the role of functional amyloid fibers in melanin biosynthesis. This review aims to consolidate scattered clues pertaining to catechol-based amyloid inhibitors, functional amyloid scaffold of melanin biosynthesis, and chemically designed peptide fibers for providing chemical insights into the role of the local three-dimensional orientation of functional groups in manifesting such interactions. These orientations may play crucial, yet undiscovered, roles in various supramolecular structures.
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Affiliation(s)
- Nghia T K Le
- Department of Applied Chemistry, Kyung Hee University, Yongin, Gyeonggi, 17104, South Korea
| | - Eun Joo Kang
- Department of Applied Chemistry, Kyung Hee University, Yongin, Gyeonggi, 17104, South Korea
| | - Ji Hun Park
- Department of Science Education, Ewha Womans University, Seoul, 03760, South Korea
| | - Kyungtae Kang
- Department of Applied Chemistry, Kyung Hee University, Yongin, Gyeonggi, 17104, South Korea
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3
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Kaur G, Mankoo OK, Goyal D, Goyal B. Unveiling How Hydroxytyrosol Destabilizes α-Syn Oligomers Using Molecular Simulations. J Phys Chem B 2023. [PMID: 37319389 DOI: 10.1021/acs.jpcb.3c02434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
The etiology of Parkinson's disease (PD) is mainly linked to the α-synuclein (α-Syn) fibrillogenesis. Hydroxytyrosol (HT), also known as 3,4-dihydroxyphenylethanol, is a naturally occurring polyphenol, found in extra virgin olive oil, and has been shown to have cardioprotective, anticancer, antiobesity, and antidiabetic properties. HT has neuroprotective benefits in neurodegenerative diseases and lessens the severity of PD by reducing the aggregation of α-Syn and destabilizing the preformed toxic α-Syn oligomers. However, the molecular mechanism by which HT destabilizes α-Syn oligomers and alleviates the accompanying cytotoxicity remains unexplored. The impact of HT on the α-Syn oligomer structure and its potential binding mechanism was examined in this work by employing molecular dynamics (MD) simulations. The secondary structure analysis depicted that HT significantly reduces the β-sheet and concomitantly increases the coil content of α-Syn trimer. Visualization of representative conformations from the clustering analysis depicted the hydrogen bond interactions of the hydroxyl groups in HT with the N-terminal and nonamyloid-β component (NAC) region residues of α-Syn trimer, which, in turn, leads to the weakening of interchain interactions in α-Syn trimer and resulted in the disruption of the α-Syn oligomer. The binding free energy calculations depict that HT binds favorably to α-Syn trimer (ΔGbinding = -23.25 ± 7.86 kcal/mol) and a notable reduction in the interchain binding affinity of α-Syn trimer on the incorporation of HT, which, in turn, highlights its potential to disrupt α-Syn oligomers. The current research provided mechanistic insights into the destabilization of α-Syn trimer by HT, which, in turn, will provide new clues for developing therapeutics against PD.
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Affiliation(s)
- Gagandeep Kaur
- Department of Chemistry, Faculty of Basic and Applied Sciences, Sri Guru Granth Sahib World University, Fatehgarh Sahib-140406, Punjab, India
| | - Opinder Kaur Mankoo
- Department of Chemistry, Faculty of Basic and Applied Sciences, Sri Guru Granth Sahib World University, Fatehgarh Sahib-140406, Punjab, India
| | - Deepti Goyal
- Department of Chemistry, DAV College, Sector 10, Chandigarh-160011, India
| | - Bhupesh Goyal
- School of Chemistry and Biochemistry, Thapar Institute of Engineering and Technology, Patiala-147004, Punjab, India
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4
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Zheng Y, Zheng C, Tu W, Jiang Y, Lin H, Chen W, Lee Q, Zheng W. Danshensu inhibits Aβ aggregation and neurotoxicity as one of the main prominent features of Alzheimer's disease. Int J Biol Macromol 2023:125294. [PMID: 37315666 DOI: 10.1016/j.ijbiomac.2023.125294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 06/03/2023] [Accepted: 06/07/2023] [Indexed: 06/16/2023]
Abstract
It has been found that the main cause of neurodegenerative proteinopathies, especially Alzheimer's disease (AD) is the formation of Aβ amyloid plaques, which can be regulated by application of potential small molecules. In the present study, we aimed to investigate the inhibitory effect of danshensu on Aβ(1-42) aggregation and relevant apoptotic pathway in neurons. A broad range of spectroscopic, theoretical, and cellular assays were done to investigate the anti-amyloidogenic characteristics of danshensu. It was found that danshensu triggers its inhibitory effect against Aβ(1-42) aggregation through modulation of hydrophobic patches as well as structural and morphological changes through a stacking interaction. Furthermore, it was observed that incubation of Aβ(1-42) samples with danshensu during aggregation process recovered the cell viability and mitigated the expression of caspase-3 mRNA and protein as well caspase-3 activity deregulated by Aβ(1-42) amyloid fibrils alone. In general, obtained data showed that danshensu potentially inhibits Aβ(1-42) aggregation and associated proteinopathies through regulation of apoptotic pathway in a concentration-dependent manner. Therefore, danshensu may be used as a promising biomolecule against the Aβ aggregation and associated proteinopathies, which can be further analyzed in the future studies for the treatment of AD.
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Affiliation(s)
- Yuyin Zheng
- Rehabilitation Medicine Center, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325027, China; Integrative & Optimized Medicine Research center, China-USA Institute for Acupuncture and Rehabilitation, Wenzhou Medical University, Wenzhou, Zhejiang 325027, China
| | - Cheng Zheng
- State Key Laboratory of Ophthalmology, Optometry and Visual Science, Eye Hospital, Wenzhou Medical University, Wenzhou 325027, China
| | - Wenzhan Tu
- Rehabilitation Medicine Center, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325027, China; Integrative & Optimized Medicine Research center, China-USA Institute for Acupuncture and Rehabilitation, Wenzhou Medical University, Wenzhou, Zhejiang 325027, China
| | - Yiwei Jiang
- Alberta Institute, Wenzhou Medical University, Wenzhou 325000, China
| | - Haiyan Lin
- Rehabilitation Medicine Center, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325027, China; Integrative & Optimized Medicine Research center, China-USA Institute for Acupuncture and Rehabilitation, Wenzhou Medical University, Wenzhou, Zhejiang 325027, China
| | - Wangchao Chen
- State Key Laboratory of Ophthalmology, Optometry and Visual Science, Eye Hospital, Wenzhou Medical University, Wenzhou 325027, China
| | - Qian Lee
- The Second Affiliated Hospital of Zhengzhou University, Zhengzhou, China.
| | - Wu Zheng
- Rehabilitation Medicine Center, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325027, China; Integrative & Optimized Medicine Research center, China-USA Institute for Acupuncture and Rehabilitation, Wenzhou Medical University, Wenzhou, Zhejiang 325027, China.
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5
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Mankoo OK, Kaur A, Goyal D, Goyal B. Unravelling the destabilization potential of ellagic acid on α-synuclein fibrils using molecular dynamics simulations. Phys Chem Chem Phys 2023; 25:8128-8143. [PMID: 36877087 DOI: 10.1039/d2cp06006j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
The aberrant deposition of α-synuclein (α-Syn) protein into the intracellular neuronal aggregates termed Lewy bodies and Lewy neurites characterizes the devastating neurodegenerative condition known as Parkinson's disease (PD). The disruption of pre-existing disease-relevant α-Syn fibrils is recognized as a viable therapeutic approach for PD. Ellagic acid (EA), a natural polyphenolic compound, is experimentally proven as a potential candidate that prevents or reverses the α-Syn fibrillization process. However, the detailed inhibitory mechanism of EA against the destabilization of α-Syn fibril remains largely unclear. In this work, the influence of EA on α-Syn fibril and its putative binding mechanism were explored using molecular dynamics (MD) simulations. EA interacted primarily with the non-amyloid-β component (NAC) of α-Syn fibril, disrupting its β-sheet content and thereby increasing the coil content. The E46-K80 salt bridge, critical for the stability of Greek-key-like α-Syn fibril, was disrupted in the presence of EA. The binding free energy analysis using the MM-PBSA method demonstrates the favourable binding of EA to α-Syn fibril (ΔGbinding = -34.62 ± 11.33 kcal mol-1). Interestingly, the binding affinity between chains H and J of the α-Syn fibril was significantly reduced on the incorporation of EA, which highlights the disruptive ability of EA towards α-Syn fibril. The MD simulations provide mechanistic insights into the α-Syn fibril disruption by EA, which gives a valuable direction for the development of potential inhibitors of α-Syn fibrillization and its associated cytotoxicity.
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Affiliation(s)
- Opinder Kaur Mankoo
- Department of Chemistry, Faculty of Basic and Applied Sciences, Sri Guru Granth Sahib World University, Fatehgarh Sahib 140406, Punjab, India
| | - Anupamjeet Kaur
- Department of Chemistry, Faculty of Basic and Applied Sciences, Sri Guru Granth Sahib World University, Fatehgarh Sahib 140406, Punjab, India
| | - Deepti Goyal
- Department of Chemistry, DAV College, Sector 10, Chandigarh 160011, India.
| | - Bhupesh Goyal
- School of Chemistry & Biochemistry, Thapar Institute of Engineering & Technology, Patiala 147004, Punjab, India.
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6
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Solid state synthesis of bispyridyl-ferrocene conjugates with unusual site selective 1,4-Michael addition, as potential inhibitor and electrochemical probe for fibrillation in amyloidogenic protein. J Mol Struct 2023. [DOI: 10.1016/j.molstruc.2022.134362] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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7
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Dimitrova YN, Gutierrez JA, Huard K. It's ok to be outnumbered - sub-stoichiometric modulation of homomeric protein complexes. RSC Med Chem 2023; 14:22-46. [PMID: 36760737 PMCID: PMC9890894 DOI: 10.1039/d2md00212d] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Accepted: 10/21/2022] [Indexed: 11/06/2022] Open
Abstract
An arsenal of molecular tools with increasingly diversified mechanisms of action is being developed by the scientific community to enable biological interrogation and pharmaceutical modulation of targets and pathways of ever increasing complexity. While most small molecules interact with the target of interest in a 1 : 1 relationship, a noteworthy number of recent examples were reported to bind in a sub-stoichiometric manner to a homomeric protein complex. This approach requires molecular understanding of the physiologically relevant protein assemblies and in-depth characterization of the compound's mechanism of action. The recent literature examples summarized here were selected to illustrate methods used to identify and characterize molecules with such mechanisms. The concept of one small molecule targeting a homomeric protein assembly is not new but the subject deserves renewed inspection in light of emerging technologies and increasingly diverse target biology, to ensure relevant in vitro systems are used and valuable compounds with potentially novel sub-stoichiometric mechanisms of action aren't overlooked.
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Affiliation(s)
| | | | - Kim Huard
- Genentech 1 DNA Way South San Francisco CA 94080 USA
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8
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Dawn A, Goswami V, Sapra S, Deep S. Nano-Formulation of Antioxidants as Effective Inhibitors of γD-Crystallin Aggregation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:1330-1344. [PMID: 36627843 DOI: 10.1021/acs.langmuir.2c03263] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
The aggregation of crystallin proteins is related to cataracts and age-related macular degeneration. Apart from surgical replacement of the cataract lens, no other alternative treatment is available till date for this ailment. In the current work, we carried out an in-depth investigation of the effect of polyphenol-loaded nano-formulations on the aggregation of γD-crystallin. At first, the protein was allowed to form amorphous aggregates under denaturing conditions. Several polyphenols were then tried to inhibit the aggregation of the protein. Among the polyphenols tested, resveratrol and quercetin were found to be the most effective. Since polyphenols are prone to degradation, they were encapsulated in chitosan nanoparticles in order to provide ambient conditions for them to function effectively. The loading efficiency and polyphenol release kinetics were subsequently tested. Finally, the efficacy of resveratrol/quercetin-loaded chitosan nano-particles as inhibitors of γD-crystallin aggregation was confirmed in a series of experiments demonstrating the potency of the system in the prospective therapeutic intervention of eye ailments concerning self-assembly of γD-crystallin proteins.
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Affiliation(s)
- Amrita Dawn
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi110016, Delhi, India
| | - Vishakha Goswami
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi110016, Delhi, India
| | - Sameer Sapra
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi110016, Delhi, India
| | - Shashank Deep
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi110016, Delhi, India
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9
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Basagni F, Naldi M, Ginex T, Luque FJ, Fagiani F, Lanni C, Iurlo M, Marcaccio M, Minarini A, Bartolini M, Rosini M. Inhibition of β-Amyloid Aggregation in Alzheimer’s Disease: The Key Role of (Pro)electrophilic Warheads. ACS Med Chem Lett 2022; 13:1812-1818. [DOI: 10.1021/acsmedchemlett.2c00410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Accepted: 10/04/2022] [Indexed: 11/28/2022] Open
Affiliation(s)
- Filippo Basagni
- Department of Pharmacy and Biotechnology, Alma Mater Studiorum - University of Bologna, Via Belmeloro 6, 40126 Bologna, Italy
| | - Marina Naldi
- Department of Pharmacy and Biotechnology, Alma Mater Studiorum - University of Bologna, Via Belmeloro 6, 40126 Bologna, Italy
| | - Tiziana Ginex
- Department of Nutrition, Food Science, and Gastronomy, Institute of Biomedicine (IBUB) and Institute of Theoretical and Computational Chemistry (IQTCUB), University of Barcelona, Avinguda Prat de la Riba 171, 08921 Santa Coloma de Gramenet, Spain
| | - F. Javier Luque
- Department of Nutrition, Food Science, and Gastronomy, Institute of Biomedicine (IBUB) and Institute of Theoretical and Computational Chemistry (IQTCUB), University of Barcelona, Avinguda Prat de la Riba 171, 08921 Santa Coloma de Gramenet, Spain
| | - Francesca Fagiani
- Department of Drug Sciences (Pharmacology Section), University of Pavia, V.le Taramelli 14, 27100 Pavia, Italy
| | - Cristina Lanni
- Department of Drug Sciences (Pharmacology Section), University of Pavia, V.le Taramelli 14, 27100 Pavia, Italy
| | - Matteo Iurlo
- Department of Chemistry “Giacomo Ciamician”, Alma Mater Studiorum - University of Bologna, Via Selmi 2, 40126 Bologna, Italy
| | - Massimo Marcaccio
- Department of Chemistry “Giacomo Ciamician”, Alma Mater Studiorum - University of Bologna, Via Selmi 2, 40126 Bologna, Italy
| | - Anna Minarini
- Department of Pharmacy and Biotechnology, Alma Mater Studiorum - University of Bologna, Via Belmeloro 6, 40126 Bologna, Italy
| | - Manuela Bartolini
- Department of Pharmacy and Biotechnology, Alma Mater Studiorum - University of Bologna, Via Belmeloro 6, 40126 Bologna, Italy
| | - Michela Rosini
- Department of Pharmacy and Biotechnology, Alma Mater Studiorum - University of Bologna, Via Belmeloro 6, 40126 Bologna, Italy
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Velander P, Wu L, Hildreth SB, Vogelaar NJ, Mukhopadhyay B, Helm RF, Zhang S, Xu B. Catechol-containing compounds are a broad class of protein aggregation inhibitors: Redox state is a key determinant of the inhibitory activities. Pharmacol Res 2022; 184:106409. [PMID: 35995346 PMCID: PMC10074477 DOI: 10.1016/j.phrs.2022.106409] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/18/2022] [Revised: 07/20/2022] [Accepted: 08/17/2022] [Indexed: 12/30/2022]
Abstract
A range of neurodegenerative and related aging diseases, such as Alzheimer's disease and type 2 diabetes, are linked to toxic protein aggregation. Yet the mechanisms of protein aggregation inhibition by small molecule inhibitors remain poorly understood, in part because most protein targets of aggregation assembly are partially unfolded or intrinsically disordered, which hinders detailed structural characterization of protein-inhibitor complexes and structural-based inhibitor design. Herein we employed a parallel small molecule library-screening approach to identify inhibitors against three prototype amyloidogenic proteins in neurodegeneration and related proteinopathies: amylin, Aβ and tau. One remarkable class of inhibitors identified from these screens against different amyloidogenic proteins was catechol-containing compounds and redox-related quinones/anthraquinones. Secondary assays validated most of the identified inhibitors. In vivo efficacy evaluation of a selected catechol-containing compound, rosmarinic acid, demonstrated its strong mitigating effects of amylin amyloid deposition and related diabetic pathology in transgenic HIP rats. Further systematic investigation of selected class of inhibitors under aerobic and anaerobic conditions revealed that the redox state of the broad class of catechol-containing compounds is a key determinant of the amyloid inhibitor activities. The molecular insights we gained not only explain why a large number of catechol-containing polyphenolic natural compounds, often enriched in healthy diet, have anti-neurodegeneration and anti-aging activities, but also could guide the rational design of therapeutic or nutraceutical strategies to target a broad range of neurodegenerative and related aging diseases.
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Affiliation(s)
- Paul Velander
- Department of Biochemistry, Virginia Polytechnic Institute & State University, Blacksburg, VA 24061, USA
| | - Ling Wu
- Department of Biochemistry, Virginia Polytechnic Institute & State University, Blacksburg, VA 24061, USA; BRITE Research Institute and Department of Pharmaceutical Sciences, North Carolina Central University, Durham, NC 27707, USA; Affiliated Faculty, Duke/UNC Alzheimer's Disease Research Center, Durham, NC 27710, USA
| | - Sherry B Hildreth
- Department of Biochemistry, Virginia Polytechnic Institute & State University, Blacksburg, VA 24061, USA
| | - Nancy J Vogelaar
- Department of Biochemistry, Virginia Polytechnic Institute & State University, Blacksburg, VA 24061, USA; Center for Drug Discovery, Virginia Polytechnic Institute & State University, Blacksburg, VA 24061, USA
| | - Biswarup Mukhopadhyay
- Department of Biochemistry, Virginia Polytechnic Institute & State University, Blacksburg, VA 24061, USA
| | - Richard F Helm
- Department of Biochemistry, Virginia Polytechnic Institute & State University, Blacksburg, VA 24061, USA
| | - Shijun Zhang
- Department of Medicinal Chemistry, Virginia Commonwealth University, Richmond, VA 23298, USA
| | - Bin Xu
- Department of Biochemistry, Virginia Polytechnic Institute & State University, Blacksburg, VA 24061, USA; Center for Drug Discovery, Virginia Polytechnic Institute & State University, Blacksburg, VA 24061, USA; School of Neuroscience, Virginia Polytechnic Institute & State University, Blacksburg, VA 24061, USA; BRITE Research Institute and Department of Pharmaceutical Sciences, North Carolina Central University, Durham, NC 27707, USA; Affiliated Faculty, Duke/UNC Alzheimer's Disease Research Center, Durham, NC 27710, USA.
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11
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Wu L, Wang Z, Lad S, Gilyazova N, Dougharty DT, Marcus M, Henderson F, Ray WK, Siedlak S, Li J, Helm RF, Zhu X, Bloom GS, Wang SHJ, Zou WQ, Xu B. Selective Detection of Misfolded Tau From Postmortem Alzheimer's Disease Brains. Front Aging Neurosci 2022; 14:945875. [PMID: 35936779 PMCID: PMC9352240 DOI: 10.3389/fnagi.2022.945875] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Accepted: 06/21/2022] [Indexed: 01/04/2023] Open
Abstract
Tau aggregates are present in multiple neurodegenerative diseases known as "tauopathies," including Alzheimer's disease, Pick's disease, progressive supranuclear palsy, and corticobasal degeneration. Such misfolded tau aggregates are therefore potential sources for selective detection and biomarker discovery. Six human tau isoforms present in brain tissues and both 3R and 4R isoforms have been observed in the neuronal inclusions. To develop selective markers for AD and related rare tauopathies, we first used an engineered tau protein fragment 4RCF as the substrate for ultrasensitive real-time quaking-induced conversion analyses (RT-QuIC). We showed that misfolded tau from diseased AD and other tauopathy brains were able to seed recombinant 4RCF substrate. We further expanded to use six individual recombinant tau isoforms as substrates to amplify misfolded tau seeds from AD brains. We demonstrated, for the first time to our knowledge, that misfolded tau from the postmortem AD brain tissues was able to specifically seed all six full-length human tau isoforms. Our results demonstrated that RT-QuIC analysis can discriminate AD and other tauopathies from non-AD normal controls. We further uncovered that 3R-tau isoforms displayed significantly faster aggregation kinetics than their 4R-tau counterparts under conditions of both no seeding and seeding with AD brain homogenates. In summary, our work offers potential new avenues of misfolded tau detection as potential biomarkers for diagnosis of AD and related tauopathies and provides new insights into isoform-specific human tau aggregation.
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Affiliation(s)
- Ling Wu
- Department of Pharmaceutical Sciences, Biomanufacturing Research Institute and Technology Enterprise (BRITE), North Carolina Central University, Durham, NC, United States
- Department of Biochemistry, Virginia Polytechnic Institute and State University, Blacksburg, VA, United States
| | - Zerui Wang
- Department of Pathology, Case Western Reserve University, Cleveland, OH, United States
| | - Shradha Lad
- Department of Biochemistry, Virginia Polytechnic Institute and State University, Blacksburg, VA, United States
| | - Nailya Gilyazova
- Department of Pharmaceutical Sciences, Biomanufacturing Research Institute and Technology Enterprise (BRITE), North Carolina Central University, Durham, NC, United States
| | - Darren T. Dougharty
- Department of Biochemistry, Virginia Polytechnic Institute and State University, Blacksburg, VA, United States
| | - Madeleine Marcus
- Department of Biochemistry, Virginia Polytechnic Institute and State University, Blacksburg, VA, United States
| | - Frances Henderson
- Department of Biochemistry, Virginia Polytechnic Institute and State University, Blacksburg, VA, United States
| | - W. Keith Ray
- Department of Biochemistry, Virginia Polytechnic Institute and State University, Blacksburg, VA, United States
| | - Sandra Siedlak
- Department of Pathology, Case Western Reserve University, Cleveland, OH, United States
| | - Jianyong Li
- Department of Biochemistry, Virginia Polytechnic Institute and State University, Blacksburg, VA, United States
| | - Richard F. Helm
- Department of Biochemistry, Virginia Polytechnic Institute and State University, Blacksburg, VA, United States
| | - Xiongwei Zhu
- Department of Pathology, Case Western Reserve University, Cleveland, OH, United States
| | - George S. Bloom
- Departments of Biology, Cell Biology, and Neuroscience, University of Virginia, Charlottesville, VA, United States
| | - Shih-Hsiu J. Wang
- Department of Pathology and Neurology, Duke University Medical Center, Durham, NC, United States
| | - Wen-Quan Zou
- Department of Pathology, Case Western Reserve University, Cleveland, OH, United States
| | - Bin Xu
- Department of Pharmaceutical Sciences, Biomanufacturing Research Institute and Technology Enterprise (BRITE), North Carolina Central University, Durham, NC, United States
- Department of Biochemistry, Virginia Polytechnic Institute and State University, Blacksburg, VA, United States
- School of Neuroscience, Virginia Polytechnic Institute and State University, Blacksburg, VA, United States
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12
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Wang Y, Hu T, Wei J, Yin X, Gao Z, Li H. Inhibitory activities of flavonoids from Scutellaria baicalensis Georgi on amyloid aggregation related to type 2 diabetes and the possible structural requirements for polyphenol in inhibiting the nucleation phase of hIAPP aggregation. Int J Biol Macromol 2022; 215:531-540. [PMID: 35724902 DOI: 10.1016/j.ijbiomac.2022.06.107] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2022] [Revised: 06/01/2022] [Accepted: 06/13/2022] [Indexed: 11/05/2022]
Abstract
Human islet amyloid polypeptide (hIAPP)-mediated cytotoxicity is identified as a potential target for developing new anti-diabetic molecules. Herein, we investigated the effect of the major bioactive compounds of Scutellaria baicalensis Georgi (S. baicalensis), including baicalein, baicalin, wogonin and oroxylin A, on hIAPP aggregation. We found that all of these compounds inhibited hIAPP fibril formation in a dose-dependent manner. But baicalein and baicalin, especially baicalein are more effective than wogonin and oroxylin A in stabilizing hIAPP monomers and eliminating toxic hIAPP assembly, suggesting that flavonoids with ortho-hydroxyl group on the A-ring exhibited higher anti-hIAPP nucleation potential than those without this structure. This stimulated our interest in further studying the possible structure-activity relationship between polyphenol and hIAPP aggregation inhibition. Our results demonstrated that flavonoids with ortho-hydroxyl group on the B-ring are also more effective against hIAPP nucleation than those without this structure. These results suggest that the ortho-hydroxybenzene structure is a key structural feature required for polyphenols to effectively inhibit hIAPP nucleation. This was further confirmed by the effect of polyphenoland phenols in inhibiting hIAPP nucleation. The conclusion that pyrogallol-type polyphenols are potential lead inhibitors may provide a valuable structural template for the further development of polyphenol-based inhibitor of amyloid peptides.
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Affiliation(s)
- Ying Wang
- Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica, School of Chemistry and Chemical Engineering, Huazhong University of Science & Technology, Wuhan 430074, PR China
| | - Ting Hu
- Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica, School of Chemistry and Chemical Engineering, Huazhong University of Science & Technology, Wuhan 430074, PR China
| | - Jingjing Wei
- Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica, School of Chemistry and Chemical Engineering, Huazhong University of Science & Technology, Wuhan 430074, PR China
| | - Xiaoying Yin
- Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica, School of Chemistry and Chemical Engineering, Huazhong University of Science & Technology, Wuhan 430074, PR China
| | - Zhonghong Gao
- Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica, School of Chemistry and Chemical Engineering, Huazhong University of Science & Technology, Wuhan 430074, PR China.
| | - Hailing Li
- Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica, School of Chemistry and Chemical Engineering, Huazhong University of Science & Technology, Wuhan 430074, PR China.
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13
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King KM, Bevan DR, Brown AM. Molecular Dynamics Simulations Indicate Aromaticity as a Key Factor in the Inhibition of IAPP (20-29) Aggregation. ACS Chem Neurosci 2022; 13:1615-1626. [PMID: 35587203 DOI: 10.1021/acschemneuro.2c00025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Islet amyloid polypeptide (IAPP) is a 37-residue amyloidogenic hormone implicated in the progression of Type II Diabetes (T2D). T2D affects an estimated 422 million people yearly and is a comorbidity with numerous diseases. IAPP forms toxic oligomers and amyloid fibrils that reduce pancreatic β-cell mass and exacerbate the T2D disease state. Toxic oligomer formation is attributed, in part, to the formation of interpeptide β-strands comprised of residues 20-29 (IAPP(20-29)). Flavonoids, a class of polyphenolic natural products, have been found experimentally to inhibit IAPP aggregate formation. Many of these small flavonoids differ structurally only slightly; the influence of functional group placement on inhibiting the aggregation of the IAPP(20-29) has yet to be explored. To probe the role of small-molecule structural features that impede IAPP aggregation, molecular dynamics simulations were performed to observe trimer formation on a model fragment of IAPP(20-29) in the presence of morin, quercetin, dihydroquercetin, epicatechin, and myricetin. Contacts between Phe23 residues were critical to oligomer formation, and small-molecule contacts with Phe23 were a key predictor of β-strand reduction. Structural properties influencing the ability of compounds to disrupt Phe23-Phe23 contacts included aromaticity and carbonyl and hydroxyl group placement. This work provides key information on design considerations for T2D therapeutics that target IAPP aggregation.
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Affiliation(s)
- Kelsie M King
- Department of Biochemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - David R Bevan
- Department of Biochemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
- Virginia Tech Center for Drug Discovery, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Anne M Brown
- Department of Biochemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
- Research and Informatics, University Libraries, Virginia Tech, Blacksburg, Virginia 24061, United States
- Virginia Tech Center for Drug Discovery, Virginia Tech, Blacksburg, Virginia 24061, United States
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14
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Baicalein: promising therapeutic applications with special reference to published patents. Pharm Pat Anal 2022; 11:23-32. [PMID: 35345898 DOI: 10.4155/ppa-2021-0027] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Baicalein is a medicinally important flavonoid present in Scutellaria baicalensis, which has numerous biological benefits like anti-oxidant, anti-inflammatory, antihepatotoxicity, anticancer properties, etc. Recent studies have revealed that baicalein is an efficient antihepatoma agent and has the strongest antiproliferative effect toward cancerous bladder cell lines, and suppression of cell cycle progression in prostate cancer cells. This natural substance has a high commercial value because it strengthens the heart and cerebral vessels and protects the nervous system and also reduces diabetes and diabetic complications. In addition, baicalein is known to decrease inflammatory markers such as IL-1β, IL-6 and TNF-α. In this review, we have attempted to compile the list of recent therapeutic patents of baicalein used for treating different disorders.
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15
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Brás NF, Ashirbaev SS, Zipse H. Combined in Silico and in Vitro Approaches To Uncover the Oxidation and Schiff Base Reaction of Baicalein as an Inhibitor of Amyloid Protein Aggregation. Chemistry 2022; 28:e202104240. [DOI: 10.1002/chem.202104240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Indexed: 11/07/2022]
Affiliation(s)
- Natércia F. Brás
- LAQV, REQUIMTE Departamento de Química e Bioquímica Faculdade de Ciências Universidade do Porto Rua do Campo Alegre s/n 4169-007 Porto Portugal
- Department Chemie Ludwig-Maximilians-Universität Muenchen 81377 Muenchen Germany
| | - Salavat S. Ashirbaev
- Department Chemie Ludwig-Maximilians-Universität Muenchen 81377 Muenchen Germany
| | - Hendrik Zipse
- Department Chemie Ludwig-Maximilians-Universität Muenchen 81377 Muenchen Germany
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16
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Ha D, Kang K. Nucleophilic Regulation of the Formation of Melanin-like Species by Amyloid Fibers. ACS OMEGA 2022; 7:773-779. [PMID: 35036743 PMCID: PMC8757343 DOI: 10.1021/acsomega.1c05399] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Accepted: 12/07/2021] [Indexed: 06/14/2023]
Abstract
This work examines the influences of amyloid fibers of hen egg white lysozyme (HEWL) on the formation of melanin-like species (MLS) with a rationally selected set of catechol derivatives. Catechol-amyloid interactions, which are central in melanogenesis, are complex and multifaceted, making them difficult to understand at the molecular level. The catechol derivatives are set to interact with HEWL amyloid fibers upon altering pH, and the resultant formation of MLS is characterized. For obtaining clues for the molecular mechanism by which HEWL fibers regulate the formation of MLS, putative intermolecular interactions are individually perturbed and their ramifications are analyzed. With the entire data set, we could conclude that the externally presented nucleophilic moieties of HEWL fibers play a major role in regulating the material and kinetic properties of MLS and their formation, respectively.
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17
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Nie T, Cooper GJS. Mechanisms Underlying the Antidiabetic Activities of Polyphenolic Compounds: A Review. Front Pharmacol 2021; 12:798329. [PMID: 34970150 PMCID: PMC8712966 DOI: 10.3389/fphar.2021.798329] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Accepted: 11/18/2021] [Indexed: 12/16/2022] Open
Abstract
Polyphenolic compounds are thought to show considerable promise for the treatment of various metabolic disorders, including type 2 diabetes mellitus (T2DM). This review addresses evidence from in vitro, in vivo, and clinical studies for the antidiabetic effects of certain polyphenolic compounds. We focus on the role of cytotoxic human amylin (hA) aggregates in the pathogenesis of T2DM, and how polyphenols can ameliorate this process by suppressing or modifying their formation. Small, soluble amylin oligomers elicit cytotoxicity in pancreatic islet β-cells and may thus cause β-cell disruption in T2DM. Amylin oligomers may also contribute to oxidative stress and inflammation that lead to the triggering of β-cell apoptosis. Polyphenols may exert antidiabetic effects via their ability to inhibit hA aggregation, and to modulate oxidative stress, inflammation, and other pathways that are β-cell-protective or insulin-sensitizing. There is evidence that their ability to inhibit and destabilize self-assembly by hA requires aromatic molecular structures that bind to misfolding monomers or oligomers, coupled with adjacent hydroxyl groups present on single phenyl rings. Thus, these multifunctional compounds have the potential to be effective against the pleiotropic mechanisms of T2DM. However, substantial further research will be required before it can be determined whether a polyphenol-based molecular entity can be used as a therapeutic for type 2 diabetes.
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Affiliation(s)
- Tina Nie
- School of Biological Sciences, Faculty of Science, the University of Auckland, Auckland, New Zealand
| | - Garth J. S. Cooper
- School of Biological Sciences, Faculty of Science, the University of Auckland, Auckland, New Zealand
- The Maurice Wilkins Centre for Molecular Biodiscovery, Faculty of Science, the University of Auckland, Auckland, New Zealand
- Centre for Advanced Discovery and Experimental Therapeutics, Division of Cardiovascular Sciences, Faculty of Biology Medicine & Health, School of Medical Sciences, The University of Manchester, Manchester, United Kingdom
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18
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Marmentini C, Branco RCS, Boschero AC, Kurauti MA. Islet amyloid toxicity: From genesis to counteracting mechanisms. J Cell Physiol 2021; 237:1119-1142. [PMID: 34636428 DOI: 10.1002/jcp.30600] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2021] [Revised: 09/09/2021] [Accepted: 10/01/2021] [Indexed: 11/11/2022]
Abstract
Islet amyloid polypeptide (IAPP or amylin) is a hormone co-secreted with insulin by pancreatic β-cells and is the major component of islet amyloid. Islet amyloid is found in the pancreas of patients with type 2 diabetes (T2D) and may be involved in β-cell dysfunction and death, observed in this disease. Thus, investigating the aspects related to amyloid formation is relevant to the development of strategies towards β-cell protection. In this sense, IAPP misprocessing, IAPP overproduction, and disturbances in intra- and extracellular environments seem to be decisive for IAPP to form islet amyloid. Islet amyloid toxicity in β-cells may be triggered in intra- and/or extracellular sites by membrane damage, endoplasmic reticulum stress, autophagy disruption, mitochondrial dysfunction, inflammation, and apoptosis. Importantly, different approaches have been suggested to prevent islet amyloid cytotoxicity, from inhibition of IAPP aggregation to attenuation of cell death mechanisms. Such approaches have improved β-cell function and prevented the development of hyperglycemia in animals. Therefore, counteracting islet amyloid may be a promising therapy for T2D treatment.
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Affiliation(s)
- Carine Marmentini
- Laboratory of Endocrine Pancreas and Metabolism, Obesity and Comorbidities Research Center (OCRC), University of Campinas (UNICAMP), Campinas, Brazil
| | - Renato C S Branco
- Laboratory of Endocrine Pancreas and Metabolism, Obesity and Comorbidities Research Center (OCRC), University of Campinas (UNICAMP), Campinas, Brazil
| | - Antonio C Boschero
- Laboratory of Endocrine Pancreas and Metabolism, Obesity and Comorbidities Research Center (OCRC), University of Campinas (UNICAMP), Campinas, Brazil
| | - Mirian A Kurauti
- Laboratory of Endocrine Pancreas and Metabolism, Obesity and Comorbidities Research Center (OCRC), University of Campinas (UNICAMP), Campinas, Brazil.,Department of Physiological Sciences, Biological Sciences Center, State University of Maringa (UEM), Maringa, Brazil
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19
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Meena VK, Kumar V, Karalia S, Garima, Sundd M. Ellagic Acid Modulates Uninduced as well as Mutation and Metal-Induced Aggregation of α-Synuclein: Implications for Parkinson's Disease. ACS Chem Neurosci 2021; 12:3598-3614. [PMID: 34506119 DOI: 10.1021/acschemneuro.1c00317] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
α-Synuclein (αS) is an intrinsically disordered protein whose aggregation and deposition in Lewy bodies is involved in the progression of Parkinson's disease (PD) and other related disorders. The aggregation process of αS is also triggered by mutations like A53T and E46K in the SNCA gene and disruption in metal-ion homeostasis. Currently, there is no obviating therapy available in the market that could effectively prevent the progression of the disease. In this backdrop, there exists an emerging need to consider naturally occurring polyphenols and flavonoids as potential therapeutic agents against PD. In this study, we demonstrate the modulatory effect of ellagic acid (EA) against wild-type as well as mutation and metal-induced aggregation of αS. Thioflavin T (ThT) fluorescence assay suggests that EA acts on the nucleation phase of αS fibrillization, thereby increasing the lag phase from 21.33 ± 3.01 to 48.20 ± 5.05 h and reducing the fibrils growth rate from 4.60 ± 2.06 to 0.890 ± 0.36 h-1. 8-Anilino-1-naphthalene sulfonic acid (ANS), Congo red (CR), and intrinsic fluorescence studies indicate that the interaction of EA with αS facilitates the structural changes in the protein that lead to inhibition of fibril formation. Dynamic light scattering (DLS) and transmission electron microscopy (TEM) images illustrate that the size of fibrils diminishes up to 100 nm in the presence of EA. Dot blot and seeding experiments put forward that EA directs the αS aggregation toward off-pathway fibrillization. Our 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay deciphers the role of EA in minimizing the αS fibril-induced toxicity, thereupon leading to an increase in cell viability. Also, EA attenuates both mutations as well as metal-induced αS fibrillization and disaggregates the preexisting fibrils. Additionally, computational studies elucidate that EA preferentially interacts with the N-terminal and NAC domain of αS. Hence, this work reveals the aggregation inhibition mechanism of EA and provides considerable therapeutic interventions against PD and related disorders.
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Affiliation(s)
- Vinod Kumar Meena
- NMR-II Lab, National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - Vijay Kumar
- NMR-II Lab, National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - Shivani Karalia
- NMR-II Lab, National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - Garima
- NMR-II Lab, National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - Monica Sundd
- NMR-II Lab, National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi 110067, India
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20
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Wu L, Velander P, Brown AM, Wang Y, Liu D, Bevan DR, Zhang S, Xu B. Rosmarinic Acid Potently Detoxifies Amylin Amyloid and Ameliorates Diabetic Pathology in a Transgenic Rat Model of Type 2 Diabetes. ACS Pharmacol Transl Sci 2021; 4:1322-1337. [PMID: 34423269 PMCID: PMC8369672 DOI: 10.1021/acsptsci.1c00028] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Indexed: 11/30/2022]
Abstract
Protein aggregation is associated with a large number of human protein-misfolding diseases, yet FDA-approved drugs are currently not available. Amylin amyloid and plaque depositions in the pancreas are hallmark features of type 2 diabetes. Moreover, these amyloid deposits are implicated in the pathogenesis of diabetic complications such as neurodegeneration. We recently discovered that catechols and redox-related quinones/anthraquinones represent a broad class of protein aggregation inhibitors. Further screening of a targeted library of natural compounds in complementary medicine that were enriched with catechol-containing compounds identified rosmarinic acid (RA) as a potent inhibitor of amylin aggregation (estimated inhibitory concentration IC50 = 200-300 nM). Structure-function relationship analysis of RA showed the additive effects of the two catechol-containing components of the RA molecule. We further showed that RA does not reverse fibrillation back to monomeric amylin but rather lead to nontoxic, remodeled protein aggregates. RA has significant ex vivo efficacy in reducing human amylin oligomer levels in HIP rat sera as well as in sera from diabetic patients. In vivo efficacy studies of RA treatment with the diabetic HIP rat model demonstrated significant reduction in amyloid islet deposition and strong mitigation of diabetic pathology. Our work provides new in vitro molecular mechanisms and in vivo efficacy insights for a model nutraceutical agent against type 2 diabetes and other aging-related protein-misfolding diseases.
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Affiliation(s)
- Ling Wu
- Department
of Biochemistry, Center for Drug Discovery, Department of Human Nutrition, Foods,
and Exercise, and School of Neuroscience, Virginia Polytechnic
Institute and State University, Blacksburg, Virginia 24061, United States
- Biomanufacturing
Research Institute & Technology Enterprise (BRITE) and Department
of Pharmaceutical Sciences, North Carolina
Central University, Durham, North Carolina 27707, United States
| | - Paul Velander
- Department
of Biochemistry, Center for Drug Discovery, Department of Human Nutrition, Foods,
and Exercise, and School of Neuroscience, Virginia Polytechnic
Institute and State University, Blacksburg, Virginia 24061, United States
| | - Anne M. Brown
- Department
of Biochemistry, Center for Drug Discovery, Department of Human Nutrition, Foods,
and Exercise, and School of Neuroscience, Virginia Polytechnic
Institute and State University, Blacksburg, Virginia 24061, United States
| | - Yao Wang
- Department
of Biochemistry, Center for Drug Discovery, Department of Human Nutrition, Foods,
and Exercise, and School of Neuroscience, Virginia Polytechnic
Institute and State University, Blacksburg, Virginia 24061, United States
| | - Dongmin Liu
- Department
of Biochemistry, Center for Drug Discovery, Department of Human Nutrition, Foods,
and Exercise, and School of Neuroscience, Virginia Polytechnic
Institute and State University, Blacksburg, Virginia 24061, United States
| | - David R. Bevan
- Department
of Biochemistry, Center for Drug Discovery, Department of Human Nutrition, Foods,
and Exercise, and School of Neuroscience, Virginia Polytechnic
Institute and State University, Blacksburg, Virginia 24061, United States
| | - Shijun Zhang
- Department
of Medicinal Chemistry, Virginia Commonwealth
University, Richmond, Virginia 23298, United States
| | - Bin Xu
- Department
of Biochemistry, Center for Drug Discovery, Department of Human Nutrition, Foods,
and Exercise, and School of Neuroscience, Virginia Polytechnic
Institute and State University, Blacksburg, Virginia 24061, United States
- Biomanufacturing
Research Institute & Technology Enterprise (BRITE) and Department
of Pharmaceutical Sciences, North Carolina
Central University, Durham, North Carolina 27707, United States
- Affiliated
Program Faculty, Duke Comprehensive Stroke
Center, Durham, North Carolina 27710, United States
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21
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Szunerits S, Melinte S, Barras A, Pagneux Q, Voronova A, Abderrahmani A, Boukherroub R. The impact of chemical engineering and technological advances on managing diabetes: present and future concepts. Chem Soc Rev 2021; 50:2102-2146. [PMID: 33325917 DOI: 10.1039/c9cs00886a] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Monitoring blood glucose levels for diabetic patients is critical to achieve tight glycaemic control. As none of the current antidiabetic treatments restore lost functional β-cell mass in diabetic patients, insulin injections and the use of insulin pumps are most widely used in the management of glycaemia. The use of advanced and intelligent chemical engineering, together with the incorporation of micro- and nanotechnological-based processes have lately revolutionized diabetic management. The start of this concept goes back to 1974 with the description of an electrode that repeatedly measures the level of blood glucose and triggers insulin release from an infusion pump to enter the blood stream from a small reservoir upon need. Next to the insulin pumps, other drug delivery routes, including nasal, transdermal and buccal, are currently investigated. These processes necessitate competences from chemists, engineers-alike and innovative views of pharmacologists and diabetologists. Engineered micro and nanostructures hold a unique potential when it comes to drug delivery applications required for the treatment of diabetic patients. As the technical aspects of chemistry, biology and informatics on medicine are expanding fast, time has come to step back and to evaluate the impact of technology-driven chemistry on diabetics and how the bridges from research laboratories to market products are established. In this review, the large variety of therapeutic approaches proposed in the last five years for diabetic patients are discussed in an applied context. A survey of the state of the art of closed-loop insulin delivery strategies in response to blood glucose level fluctuation is provided together with insights into the emerging key technologies for diagnosis and drug development. Chemical engineering strategies centered on preserving and regenerating functional pancreatic β-cell mass are evoked in addition as they represent a permanent solution for diabetic patients.
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Affiliation(s)
- Sabine Szunerits
- Univ. Lille, CNRS, Centrale Lille, Univ. Polytechnique Hauts-de-France, UMR 8520-IEMN, F-59000 Lille, France.
| | - Sorin Melinte
- Institute of Information and Communication Technologies, Electronics and Applied Mathematics, Université catholique de Louvain, 1348 Louvain-la-Neuve, Belgium
| | - Alexandre Barras
- Univ. Lille, CNRS, Centrale Lille, Univ. Polytechnique Hauts-de-France, UMR 8520-IEMN, F-59000 Lille, France.
| | - Quentin Pagneux
- Univ. Lille, CNRS, Centrale Lille, Univ. Polytechnique Hauts-de-France, UMR 8520-IEMN, F-59000 Lille, France.
| | - Anna Voronova
- Univ. Lille, CNRS, Centrale Lille, Univ. Polytechnique Hauts-de-France, UMR 8520-IEMN, F-59000 Lille, France.
| | - Amar Abderrahmani
- Univ. Lille, CNRS, Centrale Lille, Univ. Polytechnique Hauts-de-France, UMR 8520-IEMN, F-59000 Lille, France.
| | - Rabah Boukherroub
- Univ. Lille, CNRS, Centrale Lille, Univ. Polytechnique Hauts-de-France, UMR 8520-IEMN, F-59000 Lille, France.
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22
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Prasanna G, Jing P. Polyphenol binding disassembles glycation-modified bovine serum albumin amyloid fibrils. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 246:119001. [PMID: 33038859 DOI: 10.1016/j.saa.2020.119001] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Revised: 09/17/2020] [Accepted: 09/20/2020] [Indexed: 06/11/2023]
Abstract
Glycation of protein results in the formation of advanced glycation end-products (AGEs) and leads to deposition as amyloid fibrils. Adhesive structural properties of polyphenols to aromatic amino acids draw significance in promoting, accelerating and/or stabilizing on-pathway and off-pathway folding intermediates, although the mechanistic action remains unclear. In this study, polyphenols remodeling mature AGEs modified amyloid fibrils were investigated through UV-visible spectroscopy, fluorescence spectroscopy, transmission electron microscopy, atomic force microscopy, circular dichroism spectroscopy, MALDI-MS/MS analysis and molecular docking studies. Our findings confirmed the glycation-mediated transformation of native protein into β-sheet rich amyloid fibrils. SDS-PAGE results suggested the presence of shorter peptide fragments ranging from ~10 kDa to ~40 kDa. MALDI-MS/MS results identified the plausible sequences to be His105-His181, Arg193-Lys242, Leu325-Tyr410, and Ala451-Tyr529. TEM and AFM results suggested that polyphenols binding mature amyloid fibrils remodel/disassemble them into distinct aggregate structures or non-amyloid fibrils. Circular dichroism studies suggested that polyphenols upon binding amyloid fibrils stabilizes and transforms the secondary structure towards helical or random coil-like conformation. Molecular modeling studies suggested high binding affinity and hydrophobic interaction to be the main driving force in remodeling perspective. Together, our findings suggest that polyphenols could differentially remodel mature AGEs-modified amyloid fibrils into distinct aggregate structures through non-covalent interactions and can alleviate AGEs-mediated amyloidosis.
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Affiliation(s)
- Govindarajan Prasanna
- Shanghai Food Safety and Engineering Technology Research Center, Key Lab of Urban Agriculture (South), Bor S. Luh Food Safety Research Center, School of Agriculture & Biology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Pu Jing
- Shanghai Food Safety and Engineering Technology Research Center, Key Lab of Urban Agriculture (South), Bor S. Luh Food Safety Research Center, School of Agriculture & Biology, Shanghai Jiao Tong University, Shanghai 200240, China.
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23
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Panda SS, Jhanji N. Natural Products as Potential Anti-Alzheimer Agents. Curr Med Chem 2021; 27:5887-5917. [PMID: 31215372 DOI: 10.2174/0929867326666190618113613] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2018] [Revised: 03/20/2019] [Accepted: 05/28/2019] [Indexed: 01/18/2023]
Abstract
Medicinal plants have curative properties due to the presence of various complex chemical substances of different composition, which are found as secondary metabolites in one or more parts of the plant. The diverse secondary metabolites play an important role in the prevention and cure of various diseases including neurodegenerative diseases like Alzheimer's disease. Naturally occurring compounds such as flavonoids, polyphenols, alkaloids, and glycosides found in various parts of the plant and/or marine sources may potentially protect neurodegeneration as well as improve memory and cognitive function. Many natural compounds show anti-Alzheimer activity through specific pharmacological mechanisms like targeting β-amyloid, Beta-secretase 1 and Acetylcholinesterase. In this review, we have compiled more than 130 natural products with a broad diversity in the class of compounds, which were isolated from different sources showing anti- Alzheimer properties.
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Affiliation(s)
- Siva S Panda
- Department of Chemistry & Physics, Augusta University, Augusta, Georgia 30912, United States
| | - Nancy Jhanji
- Department of Chemistry & Physics, Augusta University, Augusta, Georgia 30912, United States
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24
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Saghir AE, Farrugia G, Vassallo N. The human islet amyloid polypeptide in protein misfolding disorders: Mechanisms of aggregation and interaction with biomembranes. Chem Phys Lipids 2020; 234:105010. [PMID: 33227292 DOI: 10.1016/j.chemphyslip.2020.105010] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2020] [Revised: 10/06/2020] [Accepted: 11/09/2020] [Indexed: 02/09/2023]
Abstract
Human islet amyloid polypeptide (hIAPP), otherwise known as amylin, is a 37-residue peptide hormone which is reported to be a common factor in protein misfolding disorders such as type-2 diabetes mellitus, Alzheimer's disease and Parkinson's disease, due to deposition of insoluble hIAPP amyloid in the pancreas and brain. Multiple studies point to the importance of the peptide's interaction with biological membranes and the cytotoxicity of hIAPP species. Here, we discuss the aggregation pathways of hIAPP amyloid fibril formation and focus on the complex interplay between membrane-mediated assembly of hIAPP and the associated mechanisms of membrane damage caused by the peptide species. Mitochondrial membranes, which are unique in their lipid composition, are proposed as prime targets for the early intracellular formation of hIAPP toxic entities. We suggest that future studies should include more physiologically-relevant and in-cell studies to allow a more accurate model of in vivo interactions. Finally, we underscore an urgent need for developing effective therapeutic strategies aimed at hindering hIAPP-phospholipid interactions.
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Affiliation(s)
- Adam El Saghir
- Dept. of Physiology and Biochemistry, Faculty of Medicine and Surgery, University of Malta, Msida, Malta; Centre for Molecular Medicine and Biobanking, University of Malta, Msida, Malta
| | - Gianluca Farrugia
- Dept. of Physiology and Biochemistry, Faculty of Medicine and Surgery, University of Malta, Msida, Malta; Centre for Molecular Medicine and Biobanking, University of Malta, Msida, Malta
| | - Neville Vassallo
- Dept. of Physiology and Biochemistry, Faculty of Medicine and Surgery, University of Malta, Msida, Malta; Centre for Molecular Medicine and Biobanking, University of Malta, Msida, Malta.
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25
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Prasanna G, Jing P. Self-assembly of N-terminal Alzheimer's β-amyloid and its inhibition. Biochem Biophys Res Commun 2020; 534:950-956. [PMID: 33143872 DOI: 10.1016/j.bbrc.2020.10.065] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2020] [Accepted: 10/23/2020] [Indexed: 10/23/2022]
Abstract
Peptide sequence modulates amyloid fibril formation and triggers Alzheimer's disease. The N-terminal region of amyloid peptide is disordered and lack any specific secondary structure. An ionic interaction of Aβ1-11 with factor XII is critical for the activation of the contact system in Alzheimer's disease. In this study, we report the self-assembly of fluctuating N-terminal Aβ1-11 into nanotubes using atomic force micrography, transmission electron microscopy, circular dichroism studies and molecular modeling studies. The effect of four polyphenols: baicalein, rutin, vanillin and cyanidin-3-O-glucoside (C3G) was also explored on the amyloid fibril inhibitor perspective using amyloid specific dye Thioflavin T (ThT). AFM micrographs suggested the self-assembly of Aβ1-11 into nanotubes after three weeks of incubation. Microwave treatment results in the conformational variation of disordered structure to β-sheet rich amyloid fibrils. The presence of salts (sodium and potassium chloride) induces the structural transformation of Aβ1-11 to super-helix. Fluorescence spectroscopy studies using ThT suggested differential inhibition of amyloid fibrils formation in the presence of polyphenols. Molecular modeling studies suggested that binding of polyphenols to Aβ1-11 through hydrophobic interaction (Phe4 and Tyr 10) and hydrogen bonding (Glu3 and Arg5) play a substantial role in stabilizing Aβ1-11-polyphenols complex. In the presence of polyphenols, Aβ1-11 transforms to hybrid nanostructures thus hindering amyloid fibril formation. These results provide structural insights and importance of the N-terminal residues in the Aβ1-42 self-assembly mechanism.
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Affiliation(s)
- Govindarajan Prasanna
- Shanghai Food Safety and Engineering Technology Research Center, Key Lab of Urban Agriculture (South), Bor S. Luh Food Safety Research Center, School of Agriculture & Biology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Pu Jing
- Shanghai Food Safety and Engineering Technology Research Center, Key Lab of Urban Agriculture (South), Bor S. Luh Food Safety Research Center, School of Agriculture & Biology, Shanghai Jiao Tong University, Shanghai 200240, China.
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26
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Lantz R, Busbee B, Wojcikiewicz EP, Du D. Flavonoids with Vicinal Hydroxyl Groups Inhibit Human Calcitonin Amyloid Formation. Chemistry 2020; 26:13063-13071. [PMID: 32458489 DOI: 10.1002/chem.202002027] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Revised: 05/20/2020] [Indexed: 12/14/2022]
Abstract
Human calcitonin (hCT) is a 32-residue peptide hormone that can aggregate into amyloid fibrils and cause cellular toxicity. In this study, we investigated the inhibition effects of a group of polyphenolic molecules on hCT amyloid formation. Our results suggest that the gallate moiety in epigallocatechin-3-gallate (EGCG), a well-recognized amyloid inhibitor, is not critical for its inhibition function in the hCT amyloid formation. Our results demonstrate that flavonoid compounds, such as myricetin, quercetin, and baicalein, that contain vicinal hydroxyl groups on the phenyl ring effectively prevent hCT fibrillization. This structural feature may also be applied to non-flavonoid polyphenolic inhibitors. Moreover, our results indicate a plausible mechanistic role of these vicinal hydroxyl groups which might include the oxidation to form a quinone and the subsequent covalent linkage with amino acid residues such as lysine or histidine in hCT. This may further disrupt the crucial electrostatic and aromatic interactions involved in the process of hCT amyloid fibril formation. The inhibition activity of the polyphenolic compounds against hCT fibril formation may likely be attributed to a combination of factors such as covalent linkage formation, aromatic stacking, and hydrogen bonding interactions.
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Affiliation(s)
- Richard Lantz
- Department of Chemistry and Biochemistry, Florida Atlantic University, Boca Raton, FL, 33431, USA
| | - Brian Busbee
- Department of Chemistry and Biochemistry, Florida Atlantic University, Boca Raton, FL, 33431, USA
| | - Ewa P Wojcikiewicz
- Department of Biomedical Science, Charles E. Schmidt College of Medicine, Florida Atlantic University, Boca Raton, FL, 33431, USA
| | - Deguo Du
- Department of Chemistry and Biochemistry, Florida Atlantic University, Boca Raton, FL, 33431, USA
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27
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Dubey R, Kulkarni SH, Dantu SC, Panigrahi R, Sardesai DM, Malik N, Acharya JD, Chugh J, Sharma S, Kumar A. Myricetin protects pancreatic β-cells from human islet amyloid polypeptide (hIAPP) induced cytotoxicity and restores islet function. Biol Chem 2020; 402:179-194. [PMID: 33544469 DOI: 10.1515/hsz-2020-0176] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2020] [Accepted: 08/25/2020] [Indexed: 12/13/2022]
Abstract
The aberrant misfolding and self-assembly of human islet amyloid polypeptide (hIAPP)-a hormone that is co-secreted with insulin from pancreatic β-cells-into toxic oligomers, protofibrils and fibrils has been observed in type 2 diabetes mellitus (T2DM). The formation of these insoluble aggregates has been linked with the death and dysfunction of β-cells. Therefore, hIAPP aggregation has been identified as a therapeutic target for T2DM management. Several natural products are now being investigated for their potential to inhibit hIAPP aggregation and/or disaggregate preformed aggregates. In this study, we attempt to identify the anti-amyloidogenic potential of Myricetin (MYR)- a polyphenolic flavanoid, commonly found in fruits (like Syzygium cumini). Our results from biophysical studies indicated that MYR supplementation inhibits hIAPP aggregation and disaggregates preformed fibrils into non-toxic species. This protection was accompanied by inhibition of oxidative stress, reduction in lipid peroxidation and the associated membrane damage and restoration of mitochondrial membrane potential in INS-1E cells. MYR supplementation also reversed the loss of functionality in hIAPP exposed pancreatic islets via restoration of glucose-stimulated insulin secretion. Molecular dynamics simulation studies suggested that MYR molecules interact with the hIAPP pentameric fibril model at the amyloidogenic core region and thus prevents aggregation and distort the fibrils.
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Affiliation(s)
- Richa Dubey
- Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Powai, 400076Mumbai, Maharashtra, India
| | - Shruti H Kulkarni
- Department of Biotechnology, Savitribai Phule Pune University (Formerly University of Pune), Ganeshkhind, 411007Pune, Maharashtra, India
| | - Sarath Chandra Dantu
- Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Powai, 400076Mumbai, Maharashtra, India.,Department of Computer Science, Brunel University London, UB83PHUxbridge, UK
| | - Rajlaxmi Panigrahi
- Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Powai, 400076Mumbai, Maharashtra, India
| | - Devika M Sardesai
- Department of Biotechnology, Savitribai Phule Pune University (Formerly University of Pune), Ganeshkhind, 411007Pune, Maharashtra, India
| | - Nikita Malik
- Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Powai, 400076Mumbai, Maharashtra, India
| | - Jhankar D Acharya
- Department of Zoology, Savitribai Phule Pune University (Formerly University of Pune), Ganeshkhind, 411007Pune, Maharashtra, India
| | - Jeetender Chugh
- Department of Chemistry, Indian Institute of Science Education and Research, Homi Bhabha Road, Pashan, 411008Pune, India.,Department of Biology, Indian Institute of Science Education and Research, Homi Bhabha Road, Pashan, 411008Pune, India
| | - Shilpy Sharma
- Department of Biotechnology, Savitribai Phule Pune University (Formerly University of Pune), Ganeshkhind, 411007Pune, Maharashtra, India
| | - Ashutosh Kumar
- Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Powai, 400076Mumbai, Maharashtra, India
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28
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Araújo AR, Reis RL, Pires RA. Natural Polyphenols as Modulators of the Fibrillization of Islet Amyloid Polypeptide. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2020; 1250:159-176. [PMID: 32601944 DOI: 10.1007/978-981-15-3262-7_11] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Diabetes mellitus type 2 (type-2 diabetes) is a metabolic disorder characterized by the increased blood glucose concentration and insulin resistance in peripheral tissues (e.g., muscles and adipose tissue). The initiation of the pathological cascade of events that lead to type-2 diabetes has been subject of debate; however, it has been commonly accepted that the oversecretion of human islet amyloid polypeptide (hIAPP, a hormone co-secreted with insulin) by the pancreatic 𝛽-cells is the main trigger of type-2 diabetes. In fact, 90% of the type-2 diabetes patients present hIAPP deposits in the extracellular space of the 𝛽-cells. These hIAPP supramolecular arrangements (both fibrillar and oligomeric) have been reported to be the origin of cytotoxicity, which leads to 𝛽-cell dysfunction through a series of different mechanisms, including the interaction of hIAPP oligomers with the cell membrane that leads to the influx of Ca2+ and increase in the cellular oxidative stress, among others. This overview shows the importance of developing type-2 diabetes treatment strategies able to (1) remodel of the secondary structure of cytotoxic hIAPP oligomers entrapping them into off-pathway nontoxic species and (2) reestablish physiological levels of oxidative stress. Natural polyphenols are a class of antioxidant compounds that are able to perform both functions. Herein we review the published literature of the most studied polyphenols, in particular for their ability to remodel the hIAPP aggregation pathway, to rescue the in vitro pancreatic 𝛽-cell viability and function, as well as to perform under a complex biological environment, i.e., in vivo animal models and clinical trials. Overall, natural polyphenols are able to control the cytotoxic hIAPP aggregation and minimize hIAPP-mediated cellular dysfunction and can be considered as important lead compounds for the treatment of type-2 diabetes.
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Affiliation(s)
- Ana R Araújo
- 3B's Research Group, I3Bs - Research Institute on Biomaterials, Biodegradables and Biomimetics, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, University of Minho, Guimarães, Portugal.,ICVS/3B's-PT Government Associate Laboratory, Braga/Guimarães, Portugal.,The Discoveries Centre for Regenerative and Precision Medicine, Headquarters at University of Minho, Guimarães, Portugal
| | - Rui L Reis
- 3B's Research Group, I3Bs - Research Institute on Biomaterials, Biodegradables and Biomimetics, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, University of Minho, Guimarães, Portugal.,ICVS/3B's-PT Government Associate Laboratory, Braga/Guimarães, Portugal.,The Discoveries Centre for Regenerative and Precision Medicine, Headquarters at University of Minho, Guimarães, Portugal
| | - Ricardo A Pires
- 3B's Research Group, I3Bs - Research Institute on Biomaterials, Biodegradables and Biomimetics, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, University of Minho, Guimarães, Portugal. .,ICVS/3B's-PT Government Associate Laboratory, Braga/Guimarães, Portugal. .,The Discoveries Centre for Regenerative and Precision Medicine, Headquarters at University of Minho, Guimarães, Portugal.
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29
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Wu MH, Chan AC, Tu LH. Role of lysine residue of islet amyloid polypeptide in fibril formation, membrane binding, and inhibitor binding. Biochimie 2020; 177:153-163. [PMID: 32860895 DOI: 10.1016/j.biochi.2020.08.012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Revised: 07/31/2020] [Accepted: 08/18/2020] [Indexed: 12/27/2022]
Abstract
The aggregation of islet amyloid polypeptide (IAPP) is implicated in the pathogenesis of type 2 diabetes (T2D). In T2D, this peptide aggregates to form amyloid fibrils; the mechanism responsible for islet amyloid formation is unclear. However, it is known that the aggregation propensity of IAPP is highly related to its primary sequence. Several residues have been suggested to be critical in modulating IAPP amyloid formation, but role of the sole lysine residue at position 1 (Lys-1) in IAPP has not been discussed. In our previous study, we found that glycated IAPP can form amyloid faster than normal IAPP and induce normal IAPP to expedite the aggregation process. To gain more insight into the contribution of Lys-1 in the kinetics of fibril formation, we synthesized another two IAPP variants, K1E-IAPP and K1Nle-IAPP, in which the Lys residue was mutated to glutamate and norleucine, respectively. Interestingly, we observed that the negative or neutral charged side chain at this position was preferred for amyloid formation. The findings suggested this residue may take part in the inter- or intra-molecular interaction during IAPP aggregation, even though it was proposed not to be in part of fibril core structure. Our data also revealed that the inhibitory mechanism of some inhibitors for IAPP aggregation require reaction with Lys-1. Modifications of Lys-1, such as protein glycation, may affect the effectiveness of the inhibitory action of some potential drugs in the treatment of amyloidosis.
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Affiliation(s)
- Meng-Hsin Wu
- Department of Chemistry, National Taiwan Normal University, Taipei, Taiwan
| | - Ai-Ci Chan
- Department of Chemistry, National Taiwan Normal University, Taipei, Taiwan
| | - Ling-Hsien Tu
- Department of Chemistry, National Taiwan Normal University, Taipei, Taiwan.
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30
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Liang H, Liu H, Kuang Y, Chen L, Ye M, Lai L. Discovery of Targeted Covalent Natural Products against PLK1 by Herb-Based Screening. J Chem Inf Model 2020; 60:4350-4358. [PMID: 32407091 DOI: 10.1021/acs.jcim.0c00074] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Natural products (NPs) are a rich source of drug discovery, and some of them act by covalently binding to the targets. Recently, targeted covalent natural product (TCNP) design has gained considerable attention since this approach offers significant benefits in improving biological efficacy and decreasing the off-target side effects. However, most of the known TCNPs were discovered by chance. Rational approaches for a systematic screen of TCNPs are much needed. Here, we developed a combined computational and experimental approach to carry out herb-based screening to identify TCNPs against proper cysteine residues in the target proteins. The herb-based TCNP screening approach (HB-TCNP) starts from a druggable pocket and cysteine residue prediction, followed by virtual screening of a covalent NP database and herb-based mapping to identify candidate herbs for experimental validation. Herbs with time-dependent activity are selected, and their NPs are experimentally tested to further screen covalent NPs. We have successfully applied HB-TCNP to screen anti-PLK1 herbs and NPs with high efficacy. Cys67 and Cys133 in the ATP binding pocket of PLK1 were used in the search. Five herbs were tested and exhibited PLK1 inhibition activity to some extent, among which Scutellaria baicalensis showed the most potent activity with time dependency. Further experimental studies showed that the main active compounds in Scutellaria baicalensis, baicalein and baicalin, covalently bind PLK1 through Cys133. Our study provided an efficient way to rationally design TCNPs and to make better use of herb medicines. The Cys133 residue in PLK1 serves as a novel covalent site for further drug discovery against PLK1.
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Affiliation(s)
- Hao Liang
- BNLMS, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Hongbo Liu
- BNLMS, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Yi Kuang
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, 38 Xueyuan Road, Beijing 100191, China
| | - Limin Chen
- Peking-Tsinghua Center for Life Sciences at Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China
| | - Min Ye
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, 38 Xueyuan Road, Beijing 100191, China
| | - Luhua Lai
- BNLMS, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.,Peking-Tsinghua Center for Life Sciences at Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China
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31
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Dawn A, Deep S. Thinking beyond tradition: Polyphenols as effective refolding modulators. Int J Biol Macromol 2020; 148:969-978. [PMID: 31945435 DOI: 10.1016/j.ijbiomac.2020.01.024] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Revised: 01/02/2020] [Accepted: 01/04/2020] [Indexed: 12/30/2022]
Abstract
Despite polyphenols having had proven roles as amyloid alleviators their service has rarely been made use of in protein refolding/renaturation thus far, where aggregation can be a major competing pathway. TGFβ3, expressed in inclusion bodies, is a classical example of a protein prone to high rate of aggregation severely limiting its refolding yield owing to its large cysteine content and structural complexity. Here, we have used various polyphenols (EGCG, baicalein, myricetin) either alone or in combination with the pseudo-chaperone beta cyclodextrin, in the refolding buffer. With the help of non-reducing SDS PAGE and size exclusion chromatography, we showed that refolding in the presence of baicalein or EGCG along with βCD indeed increase the yield of the native protein in a time dependent manner. EGCG expedites the refolding process giving a maximum increase of the refolding yield within 24 h while baicalein takes as long as 48 h for the same. The mechanism of mode of actions of polyphenols during refolding was further delineated by ITC. The effect of polyphenols on the aggregation kinetics and stability of native TGFβ3 were also explored. Thus these small molecules provide a promising alternate route in increasing the yield of aggregation prone proteins during refolding.
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Affiliation(s)
- Amrita Dawn
- Department of Chemistry, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi, India
| | - Shashank Deep
- Department of Chemistry, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi, India.
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32
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Raimundo AF, Ferreira S, Martins IC, Menezes R. Islet Amyloid Polypeptide: A Partner in Crime With Aβ in the Pathology of Alzheimer's Disease. Front Mol Neurosci 2020; 13:35. [PMID: 32265649 PMCID: PMC7103646 DOI: 10.3389/fnmol.2020.00035] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Accepted: 02/20/2020] [Indexed: 12/14/2022] Open
Abstract
Diabetes affects hundreds of millions of patients worldwide. Despite the advances in understanding the disease and therapeutic options, it remains a leading cause of death and of comorbidities globally. Islet amyloid polypeptide (IAPP), or amylin, is a hormone produced by pancreatic β-cells. It contributes to the maintenance of glucose physiological levels namely by inhibiting insulin and glucagon secretion as well as controlling adiposity and satiation. IAPP is a highly amyloidogenic polypeptide forming intracellular aggregates and amyloid structures that are associated with β-cell death. Data also suggest the relevance of unprocessed IAPP forms as seeding for amyloid buildup. Besides the known consequences of hyperamylinemia in the pancreas, evidence has also pointed out that IAPP has a pathological role in cognitive function. More specifically, IAPP was shown to impair the blood–brain barrier; it was also seen to interact and co-deposit with amyloid beta peptide (Aß), and possibly with Tau, within the brain of Alzheimer's disease (AD) patients, thereby contributing to diabetes-associated dementia. In fact, it has been suggested that AD results from a metabolic dysfunction in the brain, leading to its proposed designation as type 3 diabetes. Here, we have first provided a brief perspective on the IAPP amyloidogenic process and its role in diabetes and AD. We have then discussed the potential interventions for modulating IAPP proteotoxicity that can be explored for therapeutics. Finally, we have proposed the concept of a “diabetes brain phenotype” hypothesis in AD, which may help design future IAPP-centered drug developmentstrategies against AD.
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Affiliation(s)
- Ana F Raimundo
- iBET - Instituto de Biologia Experimental e Tecnológica, Oeiras, Portugal.,CEDOC - Chronic Diseases Research Center, Faculdade de Ciências Médicas, Universidade Nova de Lisboa, Lisbon, Portugal.,ITQB-NOVA, Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Oeiras, Portugal
| | - Sofia Ferreira
- iBET - Instituto de Biologia Experimental e Tecnológica, Oeiras, Portugal.,CEDOC - Chronic Diseases Research Center, Faculdade de Ciências Médicas, Universidade Nova de Lisboa, Lisbon, Portugal
| | - Ivo C Martins
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Lisbon, Portugal
| | - Regina Menezes
- iBET - Instituto de Biologia Experimental e Tecnológica, Oeiras, Portugal.,CEDOC - Chronic Diseases Research Center, Faculdade de Ciências Médicas, Universidade Nova de Lisboa, Lisbon, Portugal.,ITQB-NOVA, Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Oeiras, Portugal
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33
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Song H, Kim Y, Kim I, Kim YK, Kwon S, Kang K. Multifaceted Influences of Melanin-Like Particles on Amyloid-beta Aggregation. Chem Asian J 2020; 15:91-97. [PMID: 31778040 DOI: 10.1002/asia.201901405] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Revised: 11/06/2019] [Indexed: 11/06/2022]
Abstract
The properties of eumelanin-like particles (EMPs) and pheomelanin-like particles (PMPs) in regulating the process of amyloid formation of amyloid-beta 42 (Aβ42) were examined. EMPs and PMPs are effective both in interfering with amyloid aggregation of Aβ42 and in remodeling matured Αβ42 fibers. The results suggest that some (but not all) molecular species consisting of melanin-like particles (MPs) are responsible for their inhibiting property toward amyloid formation, and the influence is likely manifested by long-range interactions. Incubating preformed Aβ42 fibers with catechols or MPs leads to the formation of mesh-like, interconnected Aβ42 fibers encapsulated with melanin-like material. MPs are kinetically more effective than catechol monomers in this process, and a detailed investigation reveals that 4,5-dihydroxyindole, a major intermediate in the formation of melanin-like species, and its derivatives are mainly responsible for remodeling amyloid fibers.
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Affiliation(s)
- Haeun Song
- Department of Applied Chemistry, Kyung Hee University, 1732 Deogyoung-daero, Yongin, Gyeonggi, 17104, Republic of Korea
| | - Yoonyoung Kim
- Department of Applied Chemistry, Kyung Hee University, 1732 Deogyoung-daero, Yongin, Gyeonggi, 17104, Republic of Korea
| | - Inkyu Kim
- Department of Applied Chemistry, Kyung Hee University, 1732 Deogyoung-daero, Yongin, Gyeonggi, 17104, Republic of Korea
| | - Young-Kwan Kim
- Department of Chemistry, Dongguk University, 30 Pildong-ro 1-gil, Jung-gu, Seoul, 04620, Republic of Korea
| | - Sunbum Kwon
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea
| | - Kyungtae Kang
- Department of Applied Chemistry, Kyung Hee University, 1732 Deogyoung-daero, Yongin, Gyeonggi, 17104, Republic of Korea
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34
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Srinivasan E, Ravikumar S, Venkataramanan S, Purohit R, Rajasekaran R. Molecular mechanics and quantum chemical calculations unveil the combating effect of baicalein on human islet amyloid polypeptide aggregates. MOLECULAR SIMULATION 2019. [DOI: 10.1080/08927022.2019.1660778] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- E. Srinivasan
- Bioinformatics Lab, Department of Biotechnology, School of Bio Sciences and Technology, Vellore Institute of Technology (Deemed to be University), Vellore, India
| | - S. Ravikumar
- Multidisciplinary Center for Biomedical Research, Aarupadai Veedu Medical College and Hospital, Vinayaka Missions Research Foundation, Puducherry, India
| | - S. Venkataramanan
- Department of Diagnostic and Allied Health Science, Faculty of Health and Life Sciences, Management and Science University, Shah Alam, Malaysia
| | - Rituraj Purohit
- Structural Bioinformatics Laboratory, Biotechnology Division, CSIR-Institute of Himalayan Bioresource Technology (CSIR-IHBT), Palampur, India
| | - R. Rajasekaran
- Bioinformatics Lab, Department of Biotechnology, School of Bio Sciences and Technology, Vellore Institute of Technology (Deemed to be University), Vellore, India
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35
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Xu J, Zhang B, Gong G, Huang X, Du W. Inhibitory effects of oxidovanadium complexes on the aggregation of human islet amyloid polypeptide and its fragments. J Inorg Biochem 2019; 197:110721. [PMID: 31146152 DOI: 10.1016/j.jinorgbio.2019.110721] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Revised: 04/26/2019] [Accepted: 05/13/2019] [Indexed: 10/26/2022]
Abstract
Human islet amyloid polypeptide (hIAPP) is synthesized by pancreatic β-cells and co-secreted with insulin. Misfolding and amyloidosis of hIAPP induce β-cell dysfunction in type II diabetes mellitus. Numerous small organic molecules and metal complexes act as inhibitors against amyloid-related diseases, justifying the need to explore the inhibitory mechanism of these compounds. In this work, three oxidovanadium complexes, namely, (NH4)[VO(O2)2(bipy)]·4H2O (1) (bipy = 2,2' bipyridine), bis(ethyl-maltolato, O,O)oxido-vanadium(IV) (2), and (bipyH2)H2[O{VO(O2)(bipy)}2]·5H2O (3), were synthesized and used to inhibit the aggregation of hIAPP and its fragments, namely, hIAPP19-37 and hIAPP20-29. Results revealed that shortening the peptide sequence decreased the aggregation capability of hIAPP fragments, and the oxidovanadium complexes inhibited the fibrillization of hIAPP better than its fragments. Interestingly, the binding of oxidovanadium complexes to hIAPP and its fragments presented a distinct thermodynamic behavior. Oxidovanadium complexes featured the disaggregation capability against hIAPP, better than against its fragments. These complexes also decreased the cytotoxicity caused by hIAPP and its fragments by reducing the production of oligomers. 3 may be a good hIAPP inhibitor based on its inhibition, disaggregation capability, and regulatory effect on peptide-induced cytotoxicity. Oxidovanadium complexes exhibit potential as metallodrugs against amyloidosis-related diseases.
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Affiliation(s)
- Jufei Xu
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Baohong Zhang
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Gehui Gong
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Xiangyi Huang
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Weihong Du
- Department of Chemistry, Renmin University of China, Beijing 100872, China.
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36
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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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Synthesis and identification of novel pyridazinylpyrazolone based diazo compounds as inhibitors of human islet amyloid polypeptide aggregation. Bioorg Chem 2019; 84:339-346. [DOI: 10.1016/j.bioorg.2018.11.039] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2018] [Revised: 11/17/2018] [Accepted: 11/24/2018] [Indexed: 02/06/2023]
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Kim J, Thomas CA, Ewald JM, Kurien NM, Booker ME, Greve HJ, Albu TV. Studies on lysozyme modifications induced by substituted p-benzoquinones. Bioorg Chem 2019; 85:386-398. [PMID: 30665033 DOI: 10.1016/j.bioorg.2019.01.018] [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: 10/23/2018] [Revised: 01/03/2019] [Accepted: 01/08/2019] [Indexed: 11/19/2022]
Abstract
Protein misfolding can facilitate a protein damaging process and makes it susceptible to a series of events such as unfolding, adduct formation, oligomerization, or aggregation. Loss of a protein's native structure may result in its biological malfunction and/or cellular toxicity that could cause associated diseases. Several factors were identified for causing structural changes of a protein, however quinone-induced protein modifications received very little attention whether for amyloidal or non-amyloidal proteins. In this paper, we report our investigation on lysozyme modifications upon treatment with selected benzoquinones (BQs), utilizing fluorescence spectroscopy including anisotropy determination, UV-Vis spectroscopy, and SDS-PAGE. Lysozyme was reacted with substituted BQs in order to examine substituent effects on protein modifications. In addition, we evaluated lysozyme modifications induced by 1,4-benzoquinone in concentration-, pH-, temperature-, and time-dependent studies. Our study shows that all BQs can readily modify lysozyme in a complex manner through adduct formation, oligomerization, polymeric aggregation, and/or fibrilization. Electrochemical properties of selected BQs were monitored using cyclic voltammetry in phosphate buffered aqueous solution, and it was found that quinone reduction potentials correlate well with their reactivity trend toward lysozyme.
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Affiliation(s)
- Jisook Kim
- Department of Chemistry and Physics, University of Tennessee at Chattanooga, Chattanooga, TN 37403, USA.
| | - Charles A Thomas
- Department of Chemistry and Physics, University of Tennessee at Chattanooga, Chattanooga, TN 37403, USA
| | - Jacob M Ewald
- Department of Chemistry and Physics, University of Tennessee at Chattanooga, Chattanooga, TN 37403, USA
| | - Neethu M Kurien
- Department of Chemistry and Physics, University of Tennessee at Chattanooga, Chattanooga, TN 37403, USA
| | - Mary E Booker
- Department of Chemistry and Physics, University of Tennessee at Chattanooga, Chattanooga, TN 37403, USA
| | - Hendrik J Greve
- Department of Chemistry and Physics, University of Tennessee at Chattanooga, Chattanooga, TN 37403, USA
| | - Titus V Albu
- Department of Chemistry and Physics, University of Tennessee at Chattanooga, Chattanooga, TN 37403, USA.
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Gerszon J, Rodacka A. Oxidatively modified glyceraldehyde-3-phosphate dehydrogenase in neurodegenerative processes and the role of low molecular weight compounds in counteracting its aggregation and nuclear translocation. Ageing Res Rev 2018; 48:21-31. [PMID: 30254002 DOI: 10.1016/j.arr.2018.09.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Revised: 09/04/2018] [Accepted: 09/13/2018] [Indexed: 12/26/2022]
Abstract
A number of independent studies have shown the contribution of glyceraldehyde-3-phosphate dehydrogenase (GAPDH) in the pathogenesis of several neurodegenerative disorders. Indeed, GAPDH aggregates have been found in many post-mortem samples of brains of patients diagnosed with Alzheimer's and Parkinson disease. Currently, it is accepted that GAPDH-mediated cell death pathways in the neurodegenerative processes are associated with apoptosis caused by GAPDH nuclear translocation and excessive aggregation under oxidative stress conditions. Also the role of GAPDH in neurodegenerative diseases is linked to it directly binding to specific amyloidogenic proteins and petides such as β-amyloid precursor protein, β-amyloid peptide and tau protein in Alzheimer's disease, huntingtin in Huntington's disease and α-synuclein in Parkinson disease. One of the latest studies indicated that GAPDH aggregates significantly accelerate amyloidogenesis of the β-amyloid peptide, which implies that aggregates of GAPDH may act as a specific aggregation "seed" in vitro. Previous detailed studies revealed that the active-site cysteine (Cys152) of GAPDH plays an essential role in the oxidative stress-induced aggregation of GAPDH associated with cell death. Furthermore, oxidative modification of this cysteine residue initiates the translocation of the enzyme to the nucleus, subsequently leading to apoptosis. The crystallographic structure of GAPDH shows that the Cys152 residue is located close to the surface of the molecule in a hydrophilic environment, which means that it can react with low molecular weight compounds such as hydroxynonenal or piceatannol. Therefore, it is highly possible that GAPDH may serve as a target for small molecule compounds with the potential to slow down or prevent the progression of neurodegenerative disorders. Recently appearing new evidence has highlighted the significance of low molecular weight compounds in counteracting the oxidation of GAPDH and consequently its aggregation and other unfavourable pathological processes. Hence, this review aims to present all recent findings concerning molecules that are able to interact with GAPDH and counteract its aggregation and translocation to the nucleus.
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Affiliation(s)
- Joanna Gerszon
- Department of Molecular Biophysics, Faculty of Biology and Environmental Protection, University of Lodz, Lodz, Poland; Bionanopark Ltd., Lodz, Poland.
| | - Aleksandra Rodacka
- Department of Molecular Biophysics, Faculty of Biology and Environmental Protection, University of Lodz, Lodz, Poland
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Yang J, Sun Y, Xu F, Liu W, Mai Y, Hayashi T, Hattori S, Ushiki-Kaku Y, Onodera S, Tashiro SI, Ikejima T. Silibinin ameliorates amylin-induced pancreatic β-cell apoptosis partly via upregulation of GLP-1R/PKA pathway. Mol Cell Biochem 2018; 452:83-94. [DOI: 10.1007/s11010-018-3414-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2018] [Accepted: 07/13/2018] [Indexed: 12/25/2022]
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41
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Zhang Q, Zhang J, Gavathiotis E. ICBS 2017 in Shanghai-Illuminating Life with Chemical Innovation. ACS Chem Biol 2018; 13:1111-1122. [PMID: 29677443 PMCID: PMC6855916 DOI: 10.1021/acschembio.8b00220] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Qi Zhang
- Department of Chemistry, Fudan University, Shanghai 200433, China
| | - Jingyu Zhang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Evripidis Gavathiotis
- Department of Biochemistry, Department of Medicine, Albert Einstein College of Medicine, New York 10461, United States
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Ginex T, Trius M, Luque FJ. Computational Study of the Aza-Michael Addition of the Flavonoid (+)-Taxifolin in the Inhibition of β-Amyloid Fibril Aggregation. Chemistry 2018; 24:5813-5824. [PMID: 29384229 DOI: 10.1002/chem.201706072] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Indexed: 01/30/2023]
Abstract
Inhibition of abnormal protein self-aggregation is an attractive strategy against amyloidogenic diseases, but has found limited success due to the complexity of protein self-assembly, the absence of fully reproducible aggregation assays, and the scarce knowledge of the inhibition mechanisms by small molecules. In this context, catechol-containing compounds may lead to covalent adducts with amyloid fibrils that interfere with the aggregation process. In particular, the covalent adduct formed between the oxidized form of (+)-taxifolin and an β-amyloid (Aβ42) suggests the involvement of a specific recognition motif that enables the chemical reaction with Aβ42. In this study, we have examined the mechanisms implicated in the aza-Michael addition of the o-quinone species of (+)-taxifolin with Aβ42 fibrils. The results support the binding of (+)-taxifolin to the hydrophobic groove delimited by the edges defined by Lys16 and Glu22 residues in the fibril. The chemical reaction proceeds through the nucleophilic attack of the deprotonated amino group of a Lys16 residue in a process activated by the interaction between the o-quinone ring with a vicinal Lys16 residue, as well as by a water-assisted proton transfer, which is the rate-limiting step of the reaction. This specific inhibition mechanism, which may explain the enhanced anti-aggregating activity of oxidized flavonoids compared to fresh compounds, holds promise for developing disease-modifying therapies.
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Affiliation(s)
- Tiziana Ginex
- Department of Nutrition, Food Science, and Gastronomy, Faculty of Pharmacy and Institute of Biomedicine, Campus Torribera, University of Barcelona, Santa Coloma de Gramenet, 08921, Spain
| | - Marta Trius
- Department of Nutrition, Food Science, and Gastronomy, Faculty of Pharmacy and Institute of Biomedicine, Campus Torribera, University of Barcelona, Santa Coloma de Gramenet, 08921, Spain
| | - F Javier Luque
- Department of Nutrition, Food Science, and Gastronomy, Faculty of Pharmacy and Institute of Biomedicine, Campus Torribera, University of Barcelona, Santa Coloma de Gramenet, 08921, Spain
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Wu L, Velander P, Liu D, Xu B. Olive Component Oleuropein Promotes β-Cell Insulin Secretion and Protects β-Cells from Amylin Amyloid-Induced Cytotoxicity. Biochemistry 2017; 56:5035-5039. [DOI: 10.1021/acs.biochem.7b00199] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Ling Wu
- Department of Biochemistry, ‡Center for Drug Discovery, §Translational Obesity Research Center, ∥School of Neuroscience, and ⊥Department of Human Nutrition, Foods, and Exercise, Virginia Polytechnic Institute & State University, Blacksburg, Virginia 24061, United States
| | - Paul Velander
- Department of Biochemistry, ‡Center for Drug Discovery, §Translational Obesity Research Center, ∥School of Neuroscience, and ⊥Department of Human Nutrition, Foods, and Exercise, Virginia Polytechnic Institute & State University, Blacksburg, Virginia 24061, United States
| | - Dongmin Liu
- Department of Biochemistry, ‡Center for Drug Discovery, §Translational Obesity Research Center, ∥School of Neuroscience, and ⊥Department of Human Nutrition, Foods, and Exercise, Virginia Polytechnic Institute & State University, Blacksburg, Virginia 24061, United States
| | - Bin Xu
- Department of Biochemistry, ‡Center for Drug Discovery, §Translational Obesity Research Center, ∥School of Neuroscience, and ⊥Department of Human Nutrition, Foods, and Exercise, Virginia Polytechnic Institute & State University, Blacksburg, Virginia 24061, United States
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44
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Xu B. I6 Natural product-based protein amyloid inhibitors. Biochem Pharmacol 2017. [DOI: 10.1016/j.bcp.2017.06.053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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45
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Structure-activity relationships for flavone interactions with amyloid β reveal a novel anti-aggregatory and neuroprotective effect of 2′,3′,4′-trihydroxyflavone (2-D08). Bioorg Med Chem 2017; 25:3827-3834. [DOI: 10.1016/j.bmc.2017.05.041] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Accepted: 05/15/2017] [Indexed: 11/22/2022]
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46
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Omar SH. Biophenols pharmacology against the amyloidogenic activity in Alzheimer’s disease. Biomed Pharmacother 2017; 89:396-413. [DOI: 10.1016/j.biopha.2017.02.051] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Revised: 02/15/2017] [Accepted: 02/15/2017] [Indexed: 02/01/2023] Open
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Velander P, Wu L, Henderson F, Zhang S, Bevan DR, Xu B. Natural product-based amyloid inhibitors. Biochem Pharmacol 2017; 139:40-55. [PMID: 28390938 DOI: 10.1016/j.bcp.2017.04.004] [Citation(s) in RCA: 137] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Accepted: 04/03/2017] [Indexed: 11/26/2022]
Abstract
Many chronic human diseases, including multiple neurodegenerative diseases, are associated with deleterious protein aggregates, also called protein amyloids. One common therapeutic strategy is to develop protein aggregation inhibitors that can slow down, prevent, or remodel toxic amyloids. Natural products are a major class of amyloid inhibitors, and several dozens of natural product-based amyloid inhibitors have been identified and characterized in recent years. These plant- or microorganism-extracted compounds have shown significant therapeutic potential from in vitro studies as well as in vivo animal tests. Despite the technical challenges of intrinsic disordered or partially unfolded amyloid proteins that are less amenable to characterizations by structural biology, a significant amount of research has been performed, yielding biochemical and pharmacological insights into how inhibitors function. This review aims to summarize recent progress in natural product-based amyloid inhibitors and to analyze their mechanisms of inhibition in vitro. Major classes of natural product inhibitors and how they were identified are described. Our analyses comprehensively address the molecular interactions between the inhibitors and relevant amyloidogenic proteins. These interactions are delineated at molecular and atomic levels, which include covalent, non-covalent, and metal-mediated mechanisms. In vivo animal studies and clinical trials have been summarized as an extension. To enhance natural product bioavailability in vivo, emerging work using nanocarriers for delivery has also been described. Finally, issues and challenges as well as future development of such inhibitors are envisioned.
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Affiliation(s)
- Paul Velander
- Department of Biochemistry, Virginia Polytechnic Institute & State University, Blacksburg, VA 24061, USA
| | - Ling Wu
- Department of Biochemistry, Virginia Polytechnic Institute & State University, Blacksburg, VA 24061, USA
| | - Frances Henderson
- Department of Biochemistry, Virginia Polytechnic Institute & State University, Blacksburg, VA 24061, USA
| | - Shijun Zhang
- Department of Medicinal Chemistry, School of Pharmacy, Virginia Commonwealth University, Richmond, VA 23298, USA
| | - David R Bevan
- Department of Biochemistry, Virginia Polytechnic Institute & State University, Blacksburg, VA 24061, USA; Center for Drug Discovery, Virginia Polytechnic Institute & State University, Blacksburg, VA 24061, USA; School of Neuroscience, Virginia Polytechnic Institute & State University, Blacksburg, VA 24061, USA
| | - Bin Xu
- Department of Biochemistry, Virginia Polytechnic Institute & State University, Blacksburg, VA 24061, USA; Center for Drug Discovery, Virginia Polytechnic Institute & State University, Blacksburg, VA 24061, USA; School of Neuroscience, Virginia Polytechnic Institute & State University, Blacksburg, VA 24061, USA; Translational Obesity Research Center, Virginia Polytechnic Institute & State University, Blacksburg, VA 24061, USA.
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48
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Guo J, Sun W, Li L, Liu F, Lu W. Brazilin inhibits fibrillogenesis of human islet amyloid polypeptide, disassembles mature fibrils, and alleviates cytotoxicity. RSC Adv 2017. [DOI: 10.1039/c7ra05742c] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Inhibitory effect of brazilin on the fibrillogenesis of hIAPP was explored using biochemical, biophysical, cytobiological and molecular simulation experiments. Brazilin was a potential compound for therapeutic treatment of type II diabetes mellitus.
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Affiliation(s)
- Jingjing Guo
- Department of Biochemical Engineering
- Key Laboratory of Systems Bioengineering of Ministry of Education
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
| | - Wanqi Sun
- Department of Chemical and Biological Engineering
- The University of Alabama
- Tuscaloosa
- USA
| | - Li Li
- College of Marine and Environmental Sciences
- Tianjin University of Science & Technology
- Tianjin 300457
- P. R. China
| | - Fufeng Liu
- Department of Biochemical Engineering
- Key Laboratory of Systems Bioengineering of Ministry of Education
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
| | - Wenyu Lu
- Department of Biochemical Engineering
- Key Laboratory of Systems Bioengineering of Ministry of Education
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
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