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Yang T, Filippov I, Manathunga L, Baghai A, Maréchal A, Raleigh DP, Zhyvoloup A. On the importance of being amidated: Analysis of the role of the conserved C-terminal amide of amylin in amyloid formation and cytotoxicity. Biophys Chem 2024; 307:107168. [PMID: 38367541 DOI: 10.1016/j.bpc.2023.107168] [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: 10/03/2023] [Revised: 12/17/2023] [Accepted: 12/28/2023] [Indexed: 02/19/2024]
Abstract
The polypeptide hormone Amylin (also known as islet amyloid polypeptide) plays a role in regulation of glucose metabolism, but forms pancreatic islet amyloid deposits in type 2 diabetes. The process of islet amyloid formation contributes to β-cell dysfunction and the development of the disease. Amylin is produced as a pro-from and undergoes processing prior to secretion. The mature hormone contains an amidated C-terminus. Analysis of an alignment of vertebrate amylin sequences reveals that the processing signal for amidation is strictly conserved. Furthermore, the enzyme responsible for C-terminal amidation is found in all of these organisms. Comparison of the physiologically relevant amidated form to a variant with a free C-terminus (Amylin-COO-) shows that replacement of the C-terminal amide with a carboxylate slows, but does not prevent amyloid formation. Pre-fibrillar species produced by both variants are toxic to cultured β-cells, although hAmylin-COO- is moderately less so. Amyloid fibrils produced by either peptide are not toxic. Prior work (ACS Pharmacol. Translational. Sci. 1, 132-49 (2018)) shows that Amylin- COO- exhibits a 58-fold reduction in activation of the Amylin1 receptor and 20-fold reduction in activation of the Amylin3 receptor. Thus, hAmylin-COO- exhibits significant toxicity, but significantly reduced activity and offers a reagent for studies which aim to decouple hAmylin's toxic effects from its activity. The different behaviours of free and C-terminal amidated Amylin should be considered when designing systems to produce the polypeptide recombinantly.
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Affiliation(s)
- Tangweina Yang
- Institute of Structural and Molecular Biology, Division of Biosciences, University College London, Gower Street, London WC1E 6BT, United Kingdom
| | - Ivan Filippov
- Institute of Structural and Molecular Biology, Division of Biosciences, University College London, Gower Street, London WC1E 6BT, United Kingdom
| | - Lakshan Manathunga
- Laufer Center for Quantitative Biology, Stony Brook University, Nicolls Road, Stony Brook, NY 11790, United States; Department of Chemistry, Stony Brook University, Nicolls Road, Stony Brook, NY 11790, United States
| | - Aria Baghai
- Institute of Structural and Molecular Biology, Division of Biosciences, University College London, Gower Street, London WC1E 6BT, United Kingdom
| | - Amandine Maréchal
- Institute of Structural and Molecular Biology, Division of Biosciences, University College London, Gower Street, London WC1E 6BT, United Kingdom; Institute of Structural and Molecular Biology, Division of Biosciences, Birkbeck College, London WC1E 7HX, United Kingdom
| | - Daniel P Raleigh
- Institute of Structural and Molecular Biology, Division of Biosciences, University College London, Gower Street, London WC1E 6BT, United Kingdom; Laufer Center for Quantitative Biology, Stony Brook University, Nicolls Road, Stony Brook, NY 11790, United States; Department of Chemistry, Stony Brook University, Nicolls Road, Stony Brook, NY 11790, United States.
| | - Alexander Zhyvoloup
- Institute of Structural and Molecular Biology, Division of Biosciences, University College London, Gower Street, London WC1E 6BT, United Kingdom.
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2
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Kaur A, Goyal B. In silico design and identification of new peptides for mitigating hIAPP aggregation in type 2 diabetes. J Biomol Struct Dyn 2023:1-16. [PMID: 37691445 DOI: 10.1080/07391102.2023.2254411] [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: 05/10/2023] [Accepted: 08/27/2023] [Indexed: 09/12/2023]
Abstract
The aberrant misfolding and self-aggregation of human islet amyloid polypeptide (hIAPP or amylin) into cytotoxic aggregates are implicated in the pathogenesis of type 2 diabetes (T2D). Among various inhibitors, short peptides derived from the amyloidogenic regions of hIAPP have been employed as hIAPP aggregation inhibitors due to their low immunogenicity, biocompatibility, and high chemical diversity. Recently, hIAPP fragment HSSNN18-22 was identified as an amyloidogenic sequence and displayed higher antiproliferative activity to RIN-5F cells. Various hIAPP aggregation inhibitors have been designed by chemical modifications of the highly amyloidogenic sequence (NFGAIL) of hIAPP. In this work, a library of pentapeptides based on fragment HSSNN18-22 was designed and assessed for their efficacy in blocking hIAPP aggregation using an integrated computational screening approach. The binding free energy calculations by molecular mechanics Poisson-Boltzmann surface area (MM-PBSA) method identified HSSQN and HSSNQ that bind to hIAPP monomer with a binding affinity of -21.25 ± 4.90 and -19.73 ± 3.10 kcal/mol, respectively, which is notably higher as compared to HSSNN (-11.90 ± 4.12 kcal/mol). The sampling of the non aggregation-prone helical conformation was notably increased from 23.5 ± 3.0 in the hIAPP monomer to 38.1 ± 3.6, and 33.8 ± 3.0% on the incorporation of HSSQN, and HSSNQ, respectively, which indicate reduced aggregation propensity of hIAPP monomer. The pentapeptides, HSSQN and HSSNQ, identified as hIAPP aggregation inhibitors in this work can be further conjugated with various metal chelating peptides to yield more efficacious and clinically relevant multifunctional modulators for targeting various pathological hallmarks of T2D.
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Affiliation(s)
- Apneet Kaur
- School of Chemistry & Biochemistry, Thapar Institute of Engineering & Technology, Patiala, India
| | - Bhupesh Goyal
- School of Chemistry & Biochemistry, Thapar Institute of Engineering & Technology, Patiala, India
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3
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Kurtzhals P, Østergaard S, Nishimura E, Kjeldsen T. Derivatization with fatty acids in peptide and protein drug discovery. Nat Rev Drug Discov 2023; 22:59-80. [PMID: 36002588 DOI: 10.1038/s41573-022-00529-w] [Citation(s) in RCA: 23] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/29/2022] [Indexed: 01/28/2023]
Abstract
Peptides and proteins are widely used to treat a range of medical conditions; however, they often have to be injected and their effects are short-lived. These shortcomings of the native structure can be addressed by molecular engineering, but this is a complex undertaking. A molecular engineering technology initially applied to insulin - and which has now been successfully applied to several biopharmaceuticals - entails the derivatization of peptides and proteins with fatty acids. Various protraction mechanisms are enabled by the specific characteristics and positions of the attached fatty acid. Furthermore, the technology can ensure a long half-life following oral administration of peptide drugs, can alter the distribution of peptides and may hold potential for tissue targeting. Due to the inherent safety and well-defined chemical nature of the fatty acids, this technology provides a versatile approach to peptide and protein drug discovery.
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4
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Roy R, Paul S. Disparate Effect of Hybrid Peptidomimetics Containing Isomers of Aminobenzoic Acid on hIAPP Aggregation. J Phys Chem B 2022; 126:10427-10444. [PMID: 36459988 DOI: 10.1021/acs.jpcb.2c05970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
Abstract
The abnormal misfolding of human islet amyloid polypeptide (hIAPP) in pancreatic β-cells is implicated in the progression of type II diabetes (T2D). With the prevalence of T2D increasing worldwide, preventing the aggregation of hIAPP has been recognized as a promising therapeutic strategy to control this disease. Recently, a class of novel conformationally restricted β-sheet breaker hybrid peptidomimetics (BSBHps) was found to demonstrate efficient inhibitory ability toward amyloid formation of hIAPP. One (Ile26) or more (Gly24 and Ile26) residues in these six-membered peptide sequences, which have been extracted from the amyloidogenic core of hIAPP, N22FGAIL27, are substituted by three different isomers of the conformationally restricted aromatic amino acid, i.e., aminobenzoic acid (β, γ, and δ), to generate these BSBHps. The presence of the nonproteinogenic aminobenzoic acid moiety renders the BSBHps to be more stable toward proteolytic degradation. The different isomeric BSBHps exhibit contrasting influence on the self-assembly of hIAPP. The BSBHps containing β- and γ-aminobenzoic acid can sufficiently prevent hIAPP aggregation, but those with the δ-aminobenzoic group stabilize the β-sheet-rich aggregate of hIAPP. The difference in the angle between the amino and carboxyl groups in the isomers of the aminobenzoic moiety causes the BSBHps to attain discrete conformation and hence leads to variation in their binding preference with hIAPP and ultimately their inhibitory potency. This guides the pathway for the dissimilar effect of BSBHps on peptide aggregation and, therefore, provides insights into the design considerations for novel drugs against T2D.
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Affiliation(s)
- Rituparna Roy
- Department of Chemistry, Indian Institute of Technology, Guwahati781039, Assam, India
| | - Sandip Paul
- Department of Chemistry, Indian Institute of Technology, Guwahati781039, Assam, India
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5
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Li Y, Wang S, Quan K, Ma D, Zhang H, Zhang W, Chen Z, Kwok LY, Zhang Y, Sun Z. Co-administering yeast polypeptide and the probiotic, Lacticaseibacillus casei Zhang, significantly improves exercise performance. J Funct Foods 2022. [DOI: 10.1016/j.jff.2022.105161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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6
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Disaggregation of Islet Amyloid Polypeptide Fibrils as a Potential Anti-Fibrillation Mechanism of Tetrapeptide TNGQ. Int J Mol Sci 2022; 23:ijms23041972. [PMID: 35216095 PMCID: PMC8876742 DOI: 10.3390/ijms23041972] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 02/04/2022] [Accepted: 02/08/2022] [Indexed: 11/17/2022] Open
Abstract
Islet amyloid polypeptide (IAPP) fibrillation has been commonly associated with the exacerbation of type 2 diabetes prognosis. Consequently, inhibition of IAPP fibrillation to minimize β-cell cytotoxicity is an important approach towards β-cell preservation and type 2 diabetes management. In this study, we identified three tetrapeptides, TNGQ, MANT, and YMSV, that inhibited IAPP fibrillation. Using thioflavin T (ThT) fluorescence assay, circular dichroism (CD) spectroscopy, dynamic light scattering (DLS), and molecular docking, we evaluated the potential anti-fibrillation mechanism of the tetrapeptides. ThT fluorescence kinetics and microscopy as well as transmission electron microscopy showed that TNGQ was the most effective inhibitor based on the absence of normal IAPP fibrillar morphology. CD spectroscopy showed that TNGQ maintained the α-helical conformation of monomeric IAPP, while DLS confirmed the presence of varying fibrillation species. Molecular docking showed that TNGQ and MANT interact with monomeric IAPP mainly by hydrogen bonding and electrostatic interaction, with TNGQ binding at IAPP surface compared to YMSV, which had the highest docking score, but interact mainly through hydrophobic interaction in IAPP core. The highly polar TNGQ was the most active and appeared to inhibit IAPP fibrillation by disaggregation of preformed IAPP fibrils. These findings indicate the potential of TNGQ in the development of peptide-based anti-fibrillation and antidiabetic nutraceuticals.
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7
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Roy R, Paul S. hIAPP-Amyloid-Core Derived d-Peptide Prevents hIAPP Aggregation and Destabilizes Its Protofibrils. J Phys Chem B 2022; 126:822-839. [DOI: 10.1021/acs.jpcb.1c10395] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Rituparna Roy
- Department of Chemistry, Indian Institute of Technology, Guwahati, Assam, India, 781039
| | - Sandip Paul
- Department of Chemistry, Indian Institute of Technology, Guwahati, Assam, India, 781039
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8
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Abioye RO, Okagu OD, Udenigwe CC. Inhibition of Islet Amyloid Polypeptide Fibrillation by Structurally Diverse Phenolic Compounds and Fibril Disaggregation Potential of Rutin and Quercetin. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2022; 70:392-402. [PMID: 34964624 DOI: 10.1021/acs.jafc.1c06918] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The influence of 12 food-derived phenolic compounds on islet amyloid polypeptide (IAPP) fibrillation was investigated. Results from thioflavin T assay demonstrated that gallic acid, caffeic acid, and rutin and its aglycone, quercetin, inhibited IAPP fibrillation at 1:0.5, 1:1, and 1:2 IAPP-phenolic molar ratios. Circular dichroism and dynamic light scattering at the 1:1 IAPP-phenolic ratio confirmed the inhibition of fibril formation. Rutin and quercetin increased the lag time by 90 and 6%, and the relative α-helix content by 63 and 48%, respectively. Gallic acid decreased the elongation rate by 30%, whereas caffeic acid decreased the maximum fluorescence intensity by 65%. Furthermore, fluorescence microscopy and transmission electron microscopy (TEM) showed IAPP fibril morphologies indicative of fibrillation reduction by the compounds. Molecular docking and TEM showed that rutin and quercetin disaggregated preformed IAPP fibrils potentially through fibrillar-monomeric equilibrium shifts. These findings demonstrate important structural features of phenolic compounds for disaggregating IAPP fibrils or inhibiting their formation.
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Affiliation(s)
- Raliat O Abioye
- Department of Chemistry and Biomolecular Sciences, Faculty of Science, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - Ogadimma D Okagu
- Department of Chemistry and Biomolecular Sciences, Faculty of Science, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - Chibuike C Udenigwe
- Department of Chemistry and Biomolecular Sciences, Faculty of Science, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
- School of Nutrition Sciences, Faculty of Health Sciences, University of Ottawa, Ottawa K1H 8M5, Canada
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9
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Fankhauser D, Alissandratos A, Liutkus M, Easton CJ. Easy Production of "Difficult Peptides" Using Cell-Free Protein Synthesis and a New Methionine Analogue as a Latent Peptide Cleavage Site. Chemistry 2021; 27:17487-17494. [PMID: 34651362 DOI: 10.1002/chem.202103161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Indexed: 11/08/2022]
Abstract
Aliphatic γ-chloro-α-amino acids incorporated in place of their canonical analogues through cell-free protein synthesis act as heat-labile linkers, offering a useful strategy for the straightforward production of target peptides as fusion proteins, from which the targets are readily released. Until now, the natural abundance of aliphatic amino acids in peptides has limited the scope of the method, as it leads to undesired cleavage sites in synthesized products, but here the authors report the development of a new cleavable chloro amino acid that incorporates in place of the relatively rare amino acid methionine, thus greatly expanding the scope of producible targets. This new strategy is employed for simplified peptide synthesis with a methionine-free fusion partner, allowing single-site incorporation of the cleavable linker for clean release and easy purification of the target peptide. Its utility is demonstrated through the straightforward preparation of two peptides reported to be challenging targets and not accessible through standard solid-phase chemical methodologies, as well as analogues.
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Affiliation(s)
- Daniel Fankhauser
- Research School of Chemistry, Australian National University, 137 Sullivans Creek Road, Acton, ACT 2601, Australia
| | - Apostolos Alissandratos
- Research School of Chemistry, Australian National University, 137 Sullivans Creek Road, Acton, ACT 2601, Australia
| | - Mantas Liutkus
- Research School of Chemistry, Australian National University, 137 Sullivans Creek Road, Acton, ACT 2601, Australia
| | - Christopher J Easton
- Research School of Chemistry, Australian National University, 137 Sullivans Creek Road, Acton, ACT 2601, Australia
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10
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Living with the enemy: from protein-misfolding pathologies we know, to those we want to know. Ageing Res Rev 2021; 70:101391. [PMID: 34119687 DOI: 10.1016/j.arr.2021.101391] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Revised: 04/19/2021] [Accepted: 06/09/2021] [Indexed: 12/12/2022]
Abstract
Conformational diseases are caused by the aggregation of misfolded proteins. The risk for such pathologies develops years before clinical symptoms appear, and is higher in people with alpha-1 antitrypsin (AAT) polymorphisms. Thousands of people with alpha-1 antitrypsin deficiency (AATD) are underdiagnosed. Enemy-aggregating proteins may reside in these underdiagnosed AATD patients for many years before a pathology for AATD fully develops. In this perspective review, we hypothesize that the AAT protein could exert a new and previously unconsidered biological effect as an endogenous metal ion chelator that plays a significant role in essential metal ion homeostasis. In this respect, AAT polymorphism may cause an imbalance of metal ions, which could be correlated with the aggregation of amylin, tau, amyloid beta, and alpha synuclein proteins in type 2 diabetes mellitus (T2DM), Alzheimer's and Parkinson's diseases, respectively.
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11
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Zhang K, Tao C, Xu J, Ruan J, Xia J, Zhu W, Xin L, Ye H, Xie N, Xia B, Li C, Wu T, Wang Y, Schroyen M, Xiao X, Fan J, Yang S. CD8 + T Cells Involved in Metabolic Inflammation in Visceral Adipose Tissue and Liver of Transgenic Pigs. Front Immunol 2021; 12:690069. [PMID: 34322121 PMCID: PMC8311854 DOI: 10.3389/fimmu.2021.690069] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Accepted: 06/25/2021] [Indexed: 12/15/2022] Open
Abstract
Anti-inflammatory therapies have the potential to become an effective treatment for obesity-related diseases. However, the huge gap of immune system between human and rodent leads to limitations of drug discovery. This work aims at constructing a transgenic pig model with higher risk of metabolic diseases and outlining the immune responses at the early stage of metaflammation by transcriptomic strategy. We used CRISPR/Cas9 techniques to targeted knock-in three humanized disease risk genes, GIPRdn , hIAPP and PNPLA3I148M . Transgenic effect increased the risk of metabolic disorders. Triple-transgenic pigs with short-term diet intervention showed early symptoms of type 2 diabetes, including glucose intolerance, pancreatic lipid infiltration, islet hypertrophy, hepatic lobular inflammation and adipose tissue inflammation. Molecular pathways related to CD8+ T cell function were significantly activated in the liver and visceral adipose samples from triple-transgenic pigs, including antigen processing and presentation, T-cell receptor signaling, co-stimulation, cytotoxicity, and cytokine and chemokine secretion. The similar pro-inflammatory signaling in liver and visceral adipose tissue indicated that there might be a potential immune crosstalk between the two tissues. Moreover, genes that functionally related to liver antioxidant activity, mitochondrial function and extracellular matrix showed distinct expression between the two groups, indicating metabolic stress in transgenic pigs' liver samples. We confirmed that triple-transgenic pigs had high coincidence with human metabolic diseases, especially in the scope of inflammatory signaling at early stage metaflammation. Taken together, this study provides a valuable large animal model for the clinical study of metaflammation and metabolic diseases.
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Affiliation(s)
- Kaiyi Zhang
- State Key Laboratory of Animal Nutrition, Ministry of Agriculture Key Laboratory of Animal Genetics Breeding and Reproduction, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, China.,Gembloux Agro-Bio Tech, University of Liège, Gembloux, Belgium
| | - Cong Tao
- State Key Laboratory of Animal Nutrition, Ministry of Agriculture Key Laboratory of Animal Genetics Breeding and Reproduction, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Jianping Xu
- The Ministry of Health Key Laboratory of Endocrinology, Department of Endocrinology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China
| | - Jinxue Ruan
- State Key Laboratory of Animal Nutrition, Ministry of Agriculture Key Laboratory of Animal Genetics Breeding and Reproduction, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, China.,College of Animal Sciences & Technology, Huazhong Agricultural University, Wuhan, China
| | - Jihan Xia
- State Key Laboratory of Animal Nutrition, Ministry of Agriculture Key Laboratory of Animal Genetics Breeding and Reproduction, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, China.,Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | - Wenjuan Zhu
- State Key Laboratory of Animal Nutrition, Ministry of Agriculture Key Laboratory of Animal Genetics Breeding and Reproduction, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Leilei Xin
- State Key Laboratory of Animal Nutrition, Ministry of Agriculture Key Laboratory of Animal Genetics Breeding and Reproduction, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Huaqiong Ye
- State Key Laboratory of Animal Nutrition, Ministry of Agriculture Key Laboratory of Animal Genetics Breeding and Reproduction, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Ning Xie
- State Key Laboratory of Animal Nutrition, Ministry of Agriculture Key Laboratory of Animal Genetics Breeding and Reproduction, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Boce Xia
- State Key Laboratory of Animal Nutrition, Ministry of Agriculture Key Laboratory of Animal Genetics Breeding and Reproduction, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Chenxiao Li
- State Key Laboratory of Animal Nutrition, Ministry of Agriculture Key Laboratory of Animal Genetics Breeding and Reproduction, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Tianwen Wu
- State Key Laboratory of Animal Nutrition, Ministry of Agriculture Key Laboratory of Animal Genetics Breeding and Reproduction, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Yanfang Wang
- State Key Laboratory of Animal Nutrition, Ministry of Agriculture Key Laboratory of Animal Genetics Breeding and Reproduction, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, China
| | | | - Xinhua Xiao
- The Ministry of Health Key Laboratory of Endocrinology, Department of Endocrinology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China
| | - Jiangao Fan
- Shanghai Key Laboratory of Children's Digestion and Nutrition, Department of Gastroenterology, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Shulin Yang
- State Key Laboratory of Animal Nutrition, Ministry of Agriculture Key Laboratory of Animal Genetics Breeding and Reproduction, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, China
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12
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Sirangelo I, Iannuzzi C. Understanding the Role of Protein Glycation in the Amyloid Aggregation Process. Int J Mol Sci 2021; 22:ijms22126609. [PMID: 34205510 PMCID: PMC8235188 DOI: 10.3390/ijms22126609] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Revised: 06/15/2021] [Accepted: 06/16/2021] [Indexed: 02/06/2023] Open
Abstract
Protein function and flexibility is directly related to the native distribution of its structural elements and any alteration in protein architecture leads to several abnormalities and accumulation of misfolded proteins. This phenomenon is associated with a range of increasingly common human disorders, including Alzheimer and Parkinson diseases, type II diabetes, and a number of systemic amyloidosis characterized by the accumulation of amyloid aggregates both in the extracellular space of tissues and as intracellular deposits. Post-translational modifications are known to have an active role in the in vivo amyloid aggregation as able to affect protein structure and dynamics. Among them, a key role seems to be played by non-enzymatic glycation, the most unwanted irreversible modification of the protein structure, which strongly affects long-living proteins throughout the body. This study provided an overview of the molecular effects induced by glycation on the amyloid aggregation process of several protein models associated with misfolding diseases. In particular, we analyzed the role of glycation on protein folding, kinetics of amyloid formation, and amyloid cytotoxicity in order to shed light on the role of this post-translational modification in the in vivo amyloid aggregation process.
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13
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Tang Y, Liu Y, Zhang Y, Zhang D, Gong X, Zheng J. Repurposing a Cardiovascular Disease Drug of Cloridarol as hIAPP Inhibitor. ACS Chem Neurosci 2021; 12:1419-1427. [PMID: 33780229 DOI: 10.1021/acschemneuro.1c00091] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Accumulating evidence have shown a strong pathological correlation between cardiovascular disease (CVD) and Type II diabetes (T2D), both of which share many common risk factors (e.g., hyperglycemia, hypertension, hypercoagulability, and dyslipidemia) and mutually contribute to each other. Driven by such strong CVD-T2D correlation and marginal benefits from drug development for T2D, here we proposed to repurpose a CVD drug of cloridarol as human islet amyloid peptide (hIAPP) inhibitor against its abnormal misfolding and aggregation, which is considered as a common and critical pathological event in T2D. To this end, we investigated the inhibition activity of cloridarol on the aggregation and toxicity of hIAPP1-37 using combined experimental and computational approaches. Collective experimental data from ThT, AFM, and CD demonstrated the inhibition ability of cloridarol to prevent hIAPP aggregation from its monomeric and oligomeric states, leading to the overall reduction of hIAPP fibrils up to 57% at optimal conditions. MTT and LDH cell assays also showed that cloridarol can also effectively increase cell viability by 15% and decrease cell apoptosis by 28%, confirming its protection of islet β-cells from hIAPP-induced cell toxicity. Furthermore, comparative molecular dynamics simulations revealed that cloridarol was preferentially bound to the C-terminal β-sheet region of hIAPP oligomers through a combination of hydrophobic interactions, π-π stacking, and hydrogen bonding. Such multiple site bindings allowed cloridarol to disturb hIAPP structures, reduce β-sheet content, and block the lateral association pathway of hIAPP aggregates, thus explaining experimental findings. Different from other single-target hIAPP inhibitors, cloridarol is unique in that it works as both a CVD drug and hIAPP inhibitor, which can be used as a viable structural template (especially for benzofuran) for the further development of cloridarol-based or benzofuran-based inhibitors of amyloid proteins.
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Affiliation(s)
- Yijing Tang
- Department of Chemical, Biomolecular, and Corrosion Engineering The University of Akron, Ohio 44325, United States
| | - Yonglan Liu
- Department of Chemical, Biomolecular, and Corrosion Engineering The University of Akron, Ohio 44325, United States
| | | | | | - Xiong Gong
- Department of Polymer Engineering The University of Akron, Ohio 44325, United States
| | - Jie Zheng
- Department of Chemical, Biomolecular, and Corrosion Engineering The University of Akron, Ohio 44325, United States
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14
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Kalita S, Kalita S, Paul A, Shah M, Kumar S, Mandal B. Site-specific single point mutation by anthranilic acid in hIAPP 8-37 enhances anti-amyloidogenic activity. RSC Chem Biol 2021; 2:266-273. [PMID: 34458787 PMCID: PMC8341151 DOI: 10.1039/d0cb00178c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2020] [Accepted: 12/24/2020] [Indexed: 12/01/2022] Open
Abstract
Amylin or hIAPP, together with insulin, plays a significant role in glucose metabolism. However, it undergoes β-sheet rich amyloid formation associated with pancreatic β-cell dysfunction leading to type-2 diabetes (T2D). Recent studies suggest that restricting β-sheet formation in it may halt amyloid formation, which may limit the risk for the disease. Several peptide-based inhibitors have been reported to prevent aggregation. However, most of them have limitations, including low binding efficiency, active only at higher doses, poor solubility, and proteolytic degradation. Insertion of non-coded amino acids renders proteolytically stable peptides. We incorporated a structurally rigid β-amino acid, Anthranilic acid (Ant), at different sites within the central hydrophobic region of hIAPP and developed two singly mutated hIAPP8–37 peptidomimetics. These peptidomimetics inhibited the amyloid formation of hIAPP substantially even at low concentration, as evident from in vitro ThT, CD, FT-IR, TEM, and Congo red staining birefringence results. These peptidomimetics also disrupted the preformed aggregates formed by hIAPP into non-toxic species. These β-amino acid-based peptidomimetics can be an attractive scaffold for therapeutic design towards T2D or other protein misfolding diseases. β-Amino acid based peptidomimetics are attractive scaffolds for therapeutics design towards T2D. They prevent amyloid formation of hIAPP by forming non-fibrillar non-toxic aggregates.![]()
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Affiliation(s)
- Sourav Kalita
- Laboratory of Peptide and Amyloid Research, Department of Chemistry, Indian Institute of Technology Guwahati Assam-781039 India
| | - Sujan Kalita
- Laboratory of Peptide and Amyloid Research, Department of Chemistry, Indian Institute of Technology Guwahati Assam-781039 India
| | - Ashim Paul
- Laboratory of Peptide and Amyloid Research, Department of Chemistry, Indian Institute of Technology Guwahati Assam-781039 India
| | - Manisha Shah
- Department of Biosciences & Bioengineering, Indian Institute of Technology Guwahati Assam-781039 India
| | - Sachin Kumar
- Department of Biosciences & Bioengineering, Indian Institute of Technology Guwahati Assam-781039 India
| | - Bhubaneswar Mandal
- Laboratory of Peptide and Amyloid Research, Department of Chemistry, Indian Institute of Technology Guwahati Assam-781039 India
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15
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Chowdhary S, Moschner J, Mikolajczak DJ, Becker M, Thünemann AF, Kästner C, Klemczak D, Stegemann A, Böttcher C, Metrangolo P, Netz RR, Koksch B. The Impact of Halogenated Phenylalanine Derivatives on NFGAIL Amyloid Formation. Chembiochem 2020; 21:3544-3554. [PMID: 33405360 PMCID: PMC7756607 DOI: 10.1002/cbic.202000373] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Revised: 07/31/2020] [Indexed: 12/12/2022]
Abstract
The hexapeptide hIAPP22-27 (NFGAIL) is known as a crucial amyloid core sequence of the human islet amyloid polypeptide (hIAPP) whose aggregates can be used to better understand the wild-type hIAPP's toxicity to β-cell death. In amyloid research, the role of hydrophobic and aromatic-aromatic interactions as potential driving forces during the aggregation process is controversially discussed not only in case of NFGAIL, but also for amyloidogenic peptides in general. We have used halogenation of the aromatic residue as a strategy to modulate hydrophobic and aromatic-aromatic interactions and prepared a library of NFGAIL variants containing fluorinated and iodinated phenylalanine analogues. We used thioflavin T staining, transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS) to study the impact of side-chain halogenation on NFGAIL amyloid formation kinetics. Our data revealed a synergy between aggregation behavior and hydrophobicity of the phenylalanine residue. This study introduces systematic fluorination as a toolbox to further investigate the nature of the amyloid self-assembly process.
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Affiliation(s)
- Suvrat Chowdhary
- Institute of Chemistry and BiochemistryFreie Universität BerlinArnimallee 2014195BerlinGermany
| | - Johann Moschner
- Institute of Chemistry and BiochemistryFreie Universität BerlinArnimallee 2014195BerlinGermany
| | - Dorian J. Mikolajczak
- Institute of Chemistry and BiochemistryFreie Universität BerlinArnimallee 2014195BerlinGermany
| | - Maximilian Becker
- Department of PhysicsFreie Universität BerlinArnimallee 1414195BerlinGermany
| | - Andreas F. Thünemann
- Federal Institute for Materials Research and Testing (BAM)Unter den Eichen 8712205BerlinGermany
| | - Claudia Kästner
- Federal Institute for Materials Research and Testing (BAM)Unter den Eichen 8712205BerlinGermany
| | - Damian Klemczak
- Institute of PharmacyFreie Universität BerlinKönigin-Luise-Str. 2–414195BerlinGermany
| | - Anne‐Katrin Stegemann
- Institute of Chemistry and BiochemistryFreie Universität BerlinArnimallee 2014195BerlinGermany
| | - Christoph Böttcher
- Institute of Chemistry and Biochemistry and Core Facility BioSupraMolFreie Universität BerlinFabeckstraße 36a14195BerlinGermany
| | - Pierangelo Metrangolo
- Department of ChemistryMaterials and Chemical Engineering “Giulio Natta”Politecnico di MilanoVia L. Mancinelli 720131MilanItaly
| | - Roland R. Netz
- Department of PhysicsFreie Universität BerlinArnimallee 1414195BerlinGermany
| | - Beate Koksch
- Institute of Chemistry and BiochemistryFreie Universität BerlinArnimallee 2014195BerlinGermany
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16
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Tang Y, Zhang D, Zhang Y, Liu Y, Gong X, Chang Y, Ren B, Zheng J. Introduction and Fundamentals of Human Islet Amyloid Polypeptide Inhibitors. ACS APPLIED BIO MATERIALS 2020; 3:8286-8308. [DOI: 10.1021/acsabm.0c01234] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Yijing Tang
- Department of Chemical, Biomolecular, and Corrosion Engineering, The University of Akron, Akron, Ohio 44325-3906, United States
| | - Dong Zhang
- Department of Chemical, Biomolecular, and Corrosion Engineering, The University of Akron, Akron, Ohio 44325-3906, United States
| | - Yanxian Zhang
- Department of Chemical, Biomolecular, and Corrosion Engineering, The University of Akron, Akron, Ohio 44325-3906, United States
| | - Yonglan Liu
- Department of Chemical, Biomolecular, and Corrosion Engineering, The University of Akron, Akron, Ohio 44325-3906, United States
| | - Xiong Gong
- Department of Polymer Engineering, The University of Akron, Akron, Ohio 44325-0301, United States
| | - Yung Chang
- Department of Chemical Engineering, R&D Center for Membrane Technology, Chung Yuan Christian University, Taoyuan 320, Taiwan
| | - Baiping Ren
- Department of Chemical, Biomolecular, and Corrosion Engineering, The University of Akron, Akron, Ohio 44325-3906, United States
| | - Jie Zheng
- Department of Chemical, Biomolecular, and Corrosion Engineering, The University of Akron, Akron, Ohio 44325-3906, United States
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17
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Mitra A, Sarkar N. Sequence and structure-based peptides as potent amyloid inhibitors: A review. Arch Biochem Biophys 2020; 695:108614. [PMID: 33010227 DOI: 10.1016/j.abb.2020.108614] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Revised: 09/27/2020] [Accepted: 09/28/2020] [Indexed: 02/07/2023]
Abstract
Misfolded and natively disordered globular proteins tend to aggregate together in an interwoven fashion to form fibrous, proteinaceous deposits referred to as amyloid fibrils. Formation and deposition of such insoluble fibrils are the characteristic features of a broad group of diseases, known as amyloidosis. Some of these proteins are known to cause several degenerative disorders in humans, such as Amyloid-Beta (Aβ) in Alzheimer's disease (AD), human Islet Amyloid Polypeptide (hIAPP, amylin) in type 2 diabetes, α-synuclein (α-syn) in Parkinson's disease (PD) and so on. The fact that these proteins do not share any significant sequence or structural homology in their native states make therapy quite challenging. However, it is observed that aggregation-prone proteins and peptides tend to adopt a similar type of secondary structure during the formation of fibrils. Rationally designed peptides can be a potent inhibitor that has been shown to disrupt the fibril structure by binding specifically to the amyloidogenic region(s) within a protein. The following review will analyze the inhibitory potency of both sequence-based and structure-based small peptides that have been shown to inhibit amyloidogenesis of proteins such as Aβ, human amylin, and α-synuclein.
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Affiliation(s)
- Amit Mitra
- Department of Biotechnology and Medical Engineering, National Institute of Technology Rourkela, Rourkela, 769008, Odisha, India
| | - Nandini Sarkar
- Department of Biotechnology and Medical Engineering, National Institute of Technology Rourkela, Rourkela, 769008, Odisha, India.
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18
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Zhang X, Li D, Zhu X, Wang Y, Zhu P. Structural characterization and cryo-electron tomography analysis of human islet amyloid polypeptide suggest a synchronous process of the hIAPP 1-37 amyloid fibrillation. Biochem Biophys Res Commun 2020; 533:125-131. [PMID: 32943189 DOI: 10.1016/j.bbrc.2020.08.088] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2020] [Accepted: 08/25/2020] [Indexed: 10/23/2022]
Abstract
Revealing the aggregation and fibrillation process of variant amyloid proteins is critical for understanding the molecular mechanism of related amyloidosis diseases. Here we characterized the fibrillation morphology and kinetics of type 2 diabetes (T2D) related human islet amyloid polypeptide (hIAPP1-37) fibril formation process using negative staining transmission electron microscopy (NS-TEM), cryo-electron microscopy (cryo-EM) analysis, and 3D cryo-electron tomography (cryo-ET) reconstruction, together with circular dichroism (CD) and Thioflavin-T (ThT) assays. Our results showed that various amyloid fibrils can be observed at different time points of hIAPP1-37 fibrillization process, while the winding of protofibrils presents in different growth stages, which suggests a synchronous process of hIAPP1-37 amyloid fibrillization. This work provides insights into the understanding of hIAPP1-37 amyloid aggregation process and the pathogenesis of Type 2 diabetes disease.
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Affiliation(s)
- Xueli Zhang
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China; Sino-Danish College, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Dongyu Li
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China; College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Xushan Zhu
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China; Sino-Danish College, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Youwang Wang
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China; College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Ping Zhu
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China; Sino-Danish College, University of Chinese Academy of Sciences, Beijing, 100049, China; College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China.
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19
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Rozniakowski K, Fraczyk A, Galecki K, Wietrzyk J, Filip-Psurska B, Fraczyk J, Kaminski ZJ, Kolesinska B. New Human Islet Amyloid Polypeptide Fragments Susceptible to Aggregation. Chem Biodivers 2020; 17:e2000501. [PMID: 32876375 DOI: 10.1002/cbdv.202000501] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Accepted: 07/28/2020] [Indexed: 12/21/2022]
Abstract
Human Islet Amyloid Polypeptide (hIAPP) plays a key role in the pathogenesis of type II diabetes. The aim of this research was to search for new amyloidogenic fragments of hIAPP. An initial attempt to predict the amyloidogenic cores of polypeptides/proteins using five different computer programs did not provide conclusive results. Therefore, we synthesized hIAPP fragments covering the entire hormone. The fragments were assessed for their aggregation ability, using recommended methods to search for the amyloidogenic fragments of the polypeptides/proteins. It was found that fragments (18-22) H-HSSNN-OH and (33-37) H-GSNTY-NH2 aggregate and form stable amyloid-like structures. Both of these fragments have a much higher antiproliferative activity relative to the RIN-5F cell compared to the (23-27) H-FGAIL-OH fragment widely regarded as the amyloidogenic core of amylin. The analog of (33-37) H-GSNTY-NH2 containing a free carboxy group on the C-terminal amino acid (H-GSNTY-OH) does not have amyloidogenic properties and can therefore be considered as a potential inhibitor of amylin aggregation. Research on the use of non-aggregating amylin fragments as potential hormone aggregation inhibitors is ongoing.
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Affiliation(s)
- Kamil Rozniakowski
- Institute of Organic Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, Lodz, 90-924, Poland
| | - Andrzej Fraczyk
- Institute of Applied Computer Science, Lodz University of Technology, Stefanowskiego Łódź, 18/22, Lodz, 90-537, Poland
| | - Krystian Galecki
- Institute of General Food Chemistry, Faculty of Biotechnology and Food Sciences, Lodz University of Technology, Stefanowskiego 4/10, Lodz, 90-924, Poland
| | - Joanna Wietrzyk
- Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, 12 Rudolfa Weigla St., 53-114, Wroclaw, Poland
| | - Beata Filip-Psurska
- Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, 12 Rudolfa Weigla St., 53-114, Wroclaw, Poland
| | - Justyna Fraczyk
- Institute of Organic Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, Lodz, 90-924, Poland
| | - Zbigniew J Kaminski
- Institute of Organic Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, Lodz, 90-924, Poland
| | - Beata Kolesinska
- Institute of Organic Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, Lodz, 90-924, Poland
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20
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Altamirano-Bustamante NF, Garrido-Magaña E, Morán E, Calderón A, Pasten-Hidalgo K, Castillo-Rodríguez RA, Rojas G, Lara-Martínez R, Leyva-García E, Larralde-Laborde M, Domíguez G, Murata C, Margarita-Vazquez Y, Payro R, Barbosa M, Valderrama A, Montesinos H, Domínguez-Camacho A, García-Olmos VH, Ferrer R, Medina-Bravo PG, Santoscoy F, Revilla-Monsalve C, Jiménez-García LF, Morán J, Villalobos-Alva J, Villalobos MJ, Calzada-León R, Altamirano P, Altamirano-Bustamante MM. Protein-conformational diseases in childhood: Naturally-occurring hIAPP amyloid-oligomers and early β-cell damage in obesity and diabetes. PLoS One 2020; 15:e0237667. [PMID: 32833960 PMCID: PMC7446879 DOI: 10.1371/journal.pone.0237667] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Accepted: 07/30/2020] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND AND AIMS This is the first time that obesity and diabetes mellitus (DM) as protein conformational diseases (PCD) are reported in children and they are typically diagnosed too late, when β-cell damage is evident. Here we wanted to investigate the level of naturally-ocurring or real (not synthetic) oligomeric aggregates of the human islet amyloid polypeptide (hIAPP) that we called RIAO in sera of pediatric patients with obesity and diabetes. We aimed to reduce the gap between basic biomedical research, clinical practice-health decision making and to explore whether RIAO work as a potential biomarker of early β-cell damage. MATERIALS AND METHODS We performed a multicentric collaborative, cross-sectional, analytical, ambispective and blinded study; the RIAO from pretreated samples (PTS) of sera of 146 pediatric patients with obesity or DM and 16 healthy children, were isolated, measured by sound indirect ELISA with novel anti-hIAPP cytotoxic oligomers polyclonal antibody (MEX1). We carried out morphological and functional studied and cluster-clinical data driven analysis. RESULTS We demonstrated by western blot, Transmission Electron Microscopy and cell viability experiments that RIAO circulate in the blood and can be measured by ELISA; are elevated in serum of childhood obesity and diabetes; are neurotoxics and works as biomarkers of early β-cell failure. We explored the range of evidence-based medicine clusters that included the RIAO level, which allowed us to classify and stratify the obesity patients with high cardiometabolic risk. CONCLUSIONS RIAO level increases as the number of complications rises; RIAOs > 3.35 μg/ml is a predictor of changes in the current indicators of β-cell damage. We proposed a novel physio-pathological pathway and shows that PCD affect not only elderly patients but also children. Here we reduced the gap between basic biomedical research, clinical practice and health decision making.
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MESH Headings
- Adolescent
- Animals
- Cell Line
- Cell Survival
- Cells, Cultured
- Child
- Child, Preschool
- Cross-Sectional Studies
- Diabetes Mellitus, Type 1/blood
- Diabetes Mellitus, Type 1/pathology
- Diabetes Mellitus, Type 2/blood
- Diabetes Mellitus, Type 2/complications
- Diabetes Mellitus, Type 2/pathology
- Humans
- Insulin-Secreting Cells/pathology
- Islet Amyloid Polypeptide/blood
- Islet Amyloid Polypeptide/metabolism
- Islet Amyloid Polypeptide/toxicity
- Islet Amyloid Polypeptide/ultrastructure
- Microscopy, Electron, Transmission
- Neurons/drug effects
- Obesity/blood
- Obesity/complications
- Obesity/pathology
- Pilot Projects
- Primary Cell Culture
- Protein Multimerization
- Protein Structure, Quaternary
- Rats
- Toxicity Tests, Acute
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Affiliation(s)
| | - Eulalia Garrido-Magaña
- UMAE Hospital de Pediatría, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Mexico City, Mexico
| | - Eugenia Morán
- Unidad de Investigación en Enfermedades Metabólicas, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Mexico City, Mexico
| | - Aurora Calderón
- Unidad de Investigación en Enfermedades Metabólicas, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Mexico City, Mexico
| | - Karina Pasten-Hidalgo
- Instituto Nacional de Pediatría, Mexico City, Mexico
- Cátedras Conacyt, Consejo Nacional de Ciencia y Tecnología, Mexico City, Mexico
| | - Rosa Angélica Castillo-Rodríguez
- Instituto Nacional de Pediatría, Mexico City, Mexico
- Cátedras Conacyt, Consejo Nacional de Ciencia y Tecnología, Mexico City, Mexico
| | - Gerardo Rojas
- UMAE Hospital de Pediatría, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Mexico City, Mexico
| | | | - Edgar Leyva-García
- Unidad de Investigación en Enfermedades Metabólicas, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Mexico City, Mexico
| | - Mateo Larralde-Laborde
- Unidad de Investigación en Enfermedades Metabólicas, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Mexico City, Mexico
| | | | | | | | - Rafael Payro
- Unidad de Investigación en Enfermedades Metabólicas, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Mexico City, Mexico
| | - Manuel Barbosa
- Unidad de Investigación en Enfermedades Metabólicas, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Mexico City, Mexico
| | | | | | | | | | - Regina Ferrer
- Unidad de Investigación en Enfermedades Metabólicas, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Mexico City, Mexico
| | | | - Fernanda Santoscoy
- Unidad de Investigación en Enfermedades Metabólicas, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Mexico City, Mexico
| | - Cristina Revilla-Monsalve
- Unidad de Investigación en Enfermedades Metabólicas, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Mexico City, Mexico
| | | | - Julio Morán
- Instituto de Fisiología Celular, UNAM, Mexico City, Mexico
| | - Jalil Villalobos-Alva
- Unidad de Investigación en Enfermedades Metabólicas, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Mexico City, Mexico
| | - Mario Javier Villalobos
- Unidad de Investigación en Enfermedades Metabólicas, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Mexico City, Mexico
| | | | - Perla Altamirano
- Unidad de Investigación en Enfermedades Metabólicas, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Mexico City, Mexico
| | - Myriam M. Altamirano-Bustamante
- Unidad de Investigación en Enfermedades Metabólicas, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Mexico City, Mexico
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21
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Milordini G, Zacco E, Percival M, Puglisi R, Dal Piaz F, Temussi P, Pastore A. The Role of Glycation on the Aggregation Properties of IAPP. Front Mol Biosci 2020; 7:104. [PMID: 32582762 PMCID: PMC7284065 DOI: 10.3389/fmolb.2020.00104] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2020] [Accepted: 05/05/2020] [Indexed: 12/19/2022] Open
Abstract
Epidemiological evidence shows an increased risk for developing Alzheimer's disease in people affected by diabetes, a pathology associated with increased hyperglycemia. A potential factor that could explain this link could be the role that sugars may play in both diseases under the form of glycation. Contrary to glycosylation, glycation is an enzyme-free reaction that leads to formation of toxic advanced glycation end-products (AGEs). In diabetes, the islet amyloid polypeptide (IAPP or amylin) is found to be heavily glycated and to form toxic amyloid-like aggregates, similar to those observed for the Aβ peptides, often also heavily glycated, observed in Alzheimer patients. Here, we studied the effects of glycation on the structure and aggregation properties of IAPP with several biophysical techniques ranging from fluorescence to circular dichroism, mass spectrometry and atomic force microscopy. We demonstrate that glycation occurs exclusively on the N-terminal lysine leaving the only arginine (Arg11) unmodified. At variance with recent studies, we show that the dynamical interplay between glycation and aggregation affects the structure of the peptide, slows down the aggregation process and influences the aggregate morphology.
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Affiliation(s)
- Giulia Milordini
- UK Dementia Research Institute at the Maurice Wohl Institute of King's College London, London, United Kingdom
| | - Elsa Zacco
- UK Dementia Research Institute at the Maurice Wohl Institute of King's College London, London, United Kingdom
| | - Matthew Percival
- UK Dementia Research Institute at the Maurice Wohl Institute of King's College London, London, United Kingdom
| | - Rita Puglisi
- UK Dementia Research Institute at the Maurice Wohl Institute of King's College London, London, United Kingdom
| | - Fabrizio Dal Piaz
- Dipartimento di Medicina, Chirurgia e Odontoiatria "Scuola Medica Salernitana", University of Salerno, Salerno, Italy
| | - Pierandrea Temussi
- UK Dementia Research Institute at the Maurice Wohl Institute of King's College London, London, United Kingdom
| | - Annalisa Pastore
- UK Dementia Research Institute at the Maurice Wohl Institute of King's College London, London, United Kingdom
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22
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Bolarinwa O, Li C, Khadka N, Li Q, Wang Y, Pan J, Cai J. γ-AApeptides-based Small Molecule Ligands That Disaggregate Human Islet Amyloid Polypeptide. Sci Rep 2020; 10:95. [PMID: 31919432 PMCID: PMC6952368 DOI: 10.1038/s41598-019-56500-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2019] [Accepted: 11/26/2019] [Indexed: 01/21/2023] Open
Abstract
The abnormal folding and aggregation of functional proteins into amyloid is a typical feature of many age-related diseases, including Type II diabetes. Growing evidence has revealed that the prevention of aggregate formation in culprit proteins could retard the progression of amyloid diseases. Human Amylin, also known as human islet amyloid polypeptide (hIAPP), is the major factor for categorizing Type II diabetes as an amyloid disease. Specifically, hIAPP has a great aggregation potential, which always results in a lethal situation for the pancreas. Many peptide inhibitors have been constructed from the various segments of the full-length hIAPP peptide; however, only a few have their origin from the screening of combinatorial peptidomimetic library. In this study, based on HW-155, which was previously discovered from a one-bead-one compound (OBOC) library to inhibit Aβ40 aggregation, we investigated eight (8) analogues and evaluated their amyloid-prevention capabilities for inhibiting fibrillization of hIAPP. Characterization studies revealed that all analogues of HW-155, as well as HW-155, were effective inhibitors of the fibril formation by hIAPP.
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Affiliation(s)
- Olapeju Bolarinwa
- Department of Chemistry, University of South Florida, 4202 East Fowler Avenue, Tampa, Florida, 33620, United States
| | - Chunpu Li
- Department of Chemistry, University of South Florida, 4202 East Fowler Avenue, Tampa, Florida, 33620, United States
- Department of Medical Oncology, Shuguang Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, 201203, P. R. China
| | - Nawal Khadka
- Department of Physics, University of South Florida, 4202 East Fowler Avenue, Tampa, Florida, 33620, United States
| | - Qi Li
- Department of Medical Oncology, Shuguang Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, 201203, P. R. China
| | - Yan Wang
- Department of Medical Oncology, Shuguang Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, 201203, P. R. China
| | - Jianjun Pan
- Department of Physics, University of South Florida, 4202 East Fowler Avenue, Tampa, Florida, 33620, United States.
| | - Jianfeng Cai
- Department of Chemistry, University of South Florida, 4202 East Fowler Avenue, Tampa, Florida, 33620, United States.
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23
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Altamirano-Bustamante MM, Altamirano-Bustamante NF, Larralde-Laborde M, Lara-Martínez R, Leyva-García E, Garrido-Magaña E, Rojas G, Jiménez-García LF, Revilla-Monsalve C, Altamirano P, Calzada-León R. Unpacking the aggregation-oligomerization-fibrillization process of naturally-occurring hIAPP amyloid oligomers isolated directly from sera of children with obesity or diabetes mellitus. Sci Rep 2019; 9:18465. [PMID: 31804529 PMCID: PMC6895187 DOI: 10.1038/s41598-019-54570-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2019] [Accepted: 11/14/2019] [Indexed: 12/14/2022] Open
Abstract
The formation of amyloid oligomers and fibrils of the human islet amyloid polypeptide (hIAPP) has been linked with β- cell failure and death which causes the onset, progression, and comorbidities of diabetes. We begin to unpack the aggregation-oligomerization-fibrillization process of these oligomers taken from sera of pediatric patients. The naturally occurring or real hIAPP (not synthetic) amyloid oligomers (RIAO) were successfully isolated, we demonstrated the presence of homo (dodecamers, hexamers, and trimers) and hetero-RIAO, as well as several biophysical characterizations which allow us to learn from the real phenomenon taking place. We found that the aggregation/oligomerization process is active in the sera and showed that it happens very fast. The RIAO can form fibers and react with anti-hIAPP and anti-amyloid oligomers antibodies. Our results opens the epistemic horizon and reveal real differences between the four groups (Controls vs obesity, T1DM or T2DM) accelerating the process of understanding and discovering novel and more efficient prevention, diagnostic, transmission and therapeutic pathways.
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Affiliation(s)
- Myriam M Altamirano-Bustamante
- Unidad de Investigación en Enfermedades Metabólicas, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Mexico city, Mexico.
| | | | - Mateo Larralde-Laborde
- Unidad de Investigación en Enfermedades Metabólicas, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Mexico city, Mexico
| | | | - Edgar Leyva-García
- Unidad de Investigación en Enfermedades Metabólicas, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Mexico city, Mexico
| | - Eulalia Garrido-Magaña
- UMAE Hospital de Pediatría, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Mexico city, Mexico
| | - Gerardo Rojas
- UMAE Hospital de Pediatría, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Mexico city, Mexico
| | | | - Cristina Revilla-Monsalve
- Unidad de Investigación en Enfermedades Metabólicas, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Mexico city, Mexico
| | - Perla Altamirano
- Unidad de Investigación en Enfermedades Metabólicas, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Mexico city, Mexico
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Martinelli AHS, Lopes FC, John EBO, Carlini CR, Ligabue-Braun R. Modulation of Disordered Proteins with a Focus on Neurodegenerative Diseases and Other Pathologies. Int J Mol Sci 2019; 20:ijms20061322. [PMID: 30875980 PMCID: PMC6471803 DOI: 10.3390/ijms20061322] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Revised: 02/03/2019] [Accepted: 02/12/2019] [Indexed: 12/15/2022] Open
Abstract
Intrinsically disordered proteins (IDPs) do not have rigid 3D structures, showing changes in their folding depending on the environment or ligands. Intrinsically disordered proteins are widely spread in eukaryotic genomes, and these proteins participate in many cell regulatory metabolism processes. Some IDPs, when aberrantly folded, can be the cause of some diseases such as Alzheimer′s, Parkinson′s, and prionic, among others. In these diseases, there are modifications in parts of the protein or in its entirety. A common conformational variation of these IDPs is misfolding and aggregation, forming, for instance, neurotoxic amyloid plaques. In this review, we discuss some IDPs that are involved in neurodegenerative diseases (such as beta amyloid, alpha synuclein, tau, and the “IDP-like” PrP), cancer (p53, c-Myc), and diabetes (amylin), focusing on the structural changes of these IDPs that are linked to such pathologies. We also present the IDP modulation mechanisms that can be explored in new strategies for drug design. Lastly, we show some candidate drugs that can be used in the future for the treatment of diseases caused by misfolded IDPs, considering that cancer therapy has more advanced research in comparison to other diseases, while also discussing recent and future developments in this area of research. Therefore, we aim to provide support to the study of IDPs and their modulation mechanisms as promising approaches to combat such severe diseases.
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Affiliation(s)
- Anne H S Martinelli
- Department of Molecular Biology and Biotechnology & Department of Biophysics, Biosciences Institute-IB, (UFRGS), Porto Alegre CEP 91501-970, RS, Brazil.
| | - Fernanda C Lopes
- Center for Biotechnology, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre CEP 91501-970, RS, Brazil.
- Graduate Program in Cell and Molecular Biology, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre CEP 91501-970, RS, Brazil.
| | - Elisa B O John
- Center for Biotechnology, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre CEP 91501-970, RS, Brazil.
- Graduate Program in Cell and Molecular Biology, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre CEP 91501-970, RS, Brazil.
| | - Célia R Carlini
- Graduate Program in Cell and Molecular Biology, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre CEP 91501-970, RS, Brazil.
- Graduate Program in Medicine and Health Sciences, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre CEP 91410-000, RS, Brazil.
- Brain Institute-InsCer, Laboratory of Neurotoxins, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre CEP 90610-000, RS, Brazil.
| | - Rodrigo Ligabue-Braun
- Department of Pharmaceutical Sciences, Universidade Federal de Ciências da Saúde de Porto Alegre (UFCSPA), Porto Alegre CEP 90050-170, RS, Brazil.
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25
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Moore SJ, Sonar K, Bharadwaj P, Deplazes E, Mancera RL. Characterisation of the Structure and Oligomerisation of Islet Amyloid Polypeptides (IAPP): A Review of Molecular Dynamics Simulation Studies. Molecules 2018; 23:E2142. [PMID: 30149632 PMCID: PMC6225196 DOI: 10.3390/molecules23092142] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Revised: 08/21/2018] [Accepted: 08/22/2018] [Indexed: 12/26/2022] Open
Abstract
Human islet amyloid polypeptide (hIAPP) is a naturally occurring, intrinsically disordered protein whose abnormal aggregation into amyloid fibrils is a pathological feature in type 2 diabetes, and its cross-aggregation with amyloid beta has been linked to an increased risk of Alzheimer's disease. The soluble, oligomeric forms of hIAPP are the most toxic to β-cells in the pancreas. However, the structure of these oligomeric forms is difficult to characterise because of their intrinsic disorder and their tendency to rapidly aggregate into insoluble fibrils. Experimental studies of hIAPP have generally used non-physiological conditions to prevent aggregation, and they have been unable to describe its soluble monomeric and oligomeric structure at physiological conditions. Molecular dynamics (MD) simulations offer an alternative for the detailed characterisation of the monomeric structure of hIAPP and its aggregation in aqueous solution. This paper reviews the knowledge that has been gained by the use of MD simulations, and its relationship to experimental data for both hIAPP and rat IAPP. In particular, the influence of the choice of force field and water models, the choice of initial structure, and the configurational sampling method used, are discussed in detail. Characterisation of the solution structure of hIAPP and its mechanism of oligomerisation is important to understanding its cellular toxicity and its role in disease states, and may ultimately offer new opportunities for therapeutic interventions.
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Affiliation(s)
- Sandra J Moore
- School of Pharmacy and Biomedical Sciences, Curtin Health Innovation Research Institute and Curtin Institute for Computation, Curtin University, GPO Box U1987, Perth, WA 6845, Australia.
| | - Krushna Sonar
- School of Pharmacy and Biomedical Sciences, Curtin Health Innovation Research Institute and Curtin Institute for Computation, Curtin University, GPO Box U1987, Perth, WA 6845, Australia.
| | - Prashant Bharadwaj
- School of Pharmacy and Biomedical Sciences, Curtin Health Innovation Research Institute and Curtin Institute for Computation, Curtin University, GPO Box U1987, Perth, WA 6845, Australia.
- Centre of Excellence for Alzheimer's Disease Research and Care, School of Medical and Health Sciences, 270 Joondalup Drive, Edith Cowan University, Joondalup, WA 6027, Australia.
| | - Evelyne Deplazes
- School of Pharmacy and Biomedical Sciences, Curtin Health Innovation Research Institute and Curtin Institute for Computation, Curtin University, GPO Box U1987, Perth, WA 6845, Australia.
| | - Ricardo L Mancera
- School of Pharmacy and Biomedical Sciences, Curtin Health Innovation Research Institute and Curtin Institute for Computation, Curtin University, GPO Box U1987, Perth, WA 6845, Australia.
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26
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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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27
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Ge X, Yang Y, Sun Y, Cao W, Ding F. Islet Amyloid Polypeptide Promotes Amyloid-Beta Aggregation by Binding-Induced Helix-Unfolding of the Amyloidogenic Core. ACS Chem Neurosci 2018; 9:967-975. [PMID: 29378116 DOI: 10.1021/acschemneuro.7b00396] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Amyloid aggregation of amyloid-beta (Aβ) and islet amyloid polypeptide (IAPP) is associated with Alzheimer's disease (AD) and type-2 diabetes (T2D), respectively. With T2D being the risk factor for AD and the ability of IAPP to cross the blood-brain barrier, the coaggregation of Aβ and IAPP has been explored to understand the cross-talk between the two diseases. Recent studies demonstrated that soluble IAPP could significantly accelerate the aggregation of Aβ while preformed amyloids of IAPP were poor "seeds" for Aβ aggregation. Here, we apply all-atom discrete molecular dynamics simulations to investigate possible molecular mechanisms for the accelerated coaggregation of IAPP and Aβ42 comparing to Aβ42 aggregation alone, which was confirmed by the complementary thioflavin-T fluorescence assay. Our simulation results suggest that peptides in the mixture tend to form heterodimers as the first step toward their coaggregation. Strong interpeptide interactions with IAPP in the heterodimer shift the helical conformation of Aβ42 in its amyloidogenic central hydrophobic core, residues 16-22 (Aβ16-22), to the extended conformation ready to form β-sheets. Our study suggests that the unfolding of Aβ16-22 helix contributes to the aggregation free-energy barrier and corresponds to the rate-limiting conformational change for Aβ42 aggregation. Therefore, we propose that soluble IAPP promotes the aggregation of Aβ42 by binding-induced conformational change of Aβ42 in its amyloidogenic core and thus reduced aggregation free-energy barrier.
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28
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Rawat A, Langen R, Varkey J. Membranes as modulators of amyloid protein misfolding and target of toxicity. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2018; 1860:1863-1875. [PMID: 29702073 DOI: 10.1016/j.bbamem.2018.04.011] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2018] [Revised: 04/19/2018] [Accepted: 04/19/2018] [Indexed: 12/15/2022]
Abstract
Abnormal protein aggregation is a hallmark of various human diseases. α-Synuclein, a protein implicated in Parkinson's disease, is found in aggregated form within Lewy bodies that are characteristically observed in the brains of PD patients. Similarly, deposits of aggregated human islet amyloid polypeptide (IAPP) are found in the pancreatic islets in individuals with type 2 diabetes mellitus. Significant number of studies have focused on how monomeric, disaggregated proteins transition into various amyloid structures leading to identification of a vast number of aggregation promoting molecules and processes over the years. Inasmuch as these factors likely enhance the formation of toxic, misfolded species, they might act as risk factors in disease. Cellular membranes, and particularly certain lipids, are considered to be among the major players for aggregation of α-synuclein and IAPP, and membranes might also be the target of toxicity. Past studies have utilized an array of biophysical tools, both in vitro and in vivo, to expound the membrane-mediated aggregation. Here, we focus on membrane interaction of α-synuclein and IAPP, and how various kinds of membranes catalyze or modulate the aggregation of these proteins and how, in turn, these proteins disrupt membrane integrity, both in vitro and in vivo. The membrane interaction and subsequent aggregation has been briefly contrasted to aggregation of α-synuclein and IAPP in solution. This article is part of a Special Issue entitled: Protein Aggregation and Misfolding at the Cell Membrane Interface edited by Ayyalusamy Ramamoorthy.
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Affiliation(s)
- Anoop Rawat
- Zilkha Neurogenetic Institute, University of Southern California, Los Angeles, CA 90033, United States
| | - Ralf Langen
- Zilkha Neurogenetic Institute, University of Southern California, Los Angeles, CA 90033, United States.
| | - Jobin Varkey
- Zilkha Neurogenetic Institute, University of Southern California, Los Angeles, CA 90033, United States.
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29
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Sasahara K. Membrane-mediated amyloid deposition of human islet amyloid polypeptide. Biophys Rev 2018; 10:453-462. [PMID: 29204886 PMCID: PMC5899711 DOI: 10.1007/s12551-017-0351-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Accepted: 11/14/2017] [Indexed: 01/01/2023] Open
Abstract
Amyloid deposition of human islet amyloid polypeptide (hIAPP) within the islet of Langerhans is closely associated with type II diabetes mellitus. Accumulating evidence indicates that the membrane-mediated aggregation and subsequent deposition of hIAPP are linked to the dysfunction and death of insulin-producing pancreatic β-cells, but the molecular process of hIAPP deposition is poorly understood. In this review, I focus on recent in vitro studies utilizing model membranes to observe the membrane-mediated aggregation/deposition of hIAPP. Membrane surfaces can serve as templates for both hIAPP adsorption and aggregation. Using high-sensitivity surface analyzing/imaging techniques that can characterize the processes of hIAPP aggregation and deposition at the membrane surface, these studies provide valuable insights into the mechanism of membrane damage caused by amyloid deposition of the peptide.
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Affiliation(s)
- Kenji Sasahara
- Institute for Protein Research, Osaka University, 3-2 Yamadaoka, Suita, Osaka, 565-0871, Japan.
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30
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Abedini A, Cao P, Plesner A, Zhang J, He M, Derk J, Patil SA, Rosario R, Lonier J, Song F, Koh H, Li H, Raleigh DP, Schmidt AM. RAGE binds preamyloid IAPP intermediates and mediates pancreatic β cell proteotoxicity. J Clin Invest 2018; 128:682-698. [PMID: 29337308 DOI: 10.1172/jci85210] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2015] [Accepted: 11/17/2017] [Indexed: 01/04/2023] Open
Abstract
Islet amyloidosis is characterized by the aberrant accumulation of islet amyloid polypeptide (IAPP) in pancreatic islets, resulting in β cell toxicity, which exacerbates type 2 diabetes and islet transplant failure. It is not fully clear how IAPP induces cellular stress or how IAPP-induced toxicity can be prevented or treated. We recently defined the properties of toxic IAPP species. Here, we have identified a receptor-mediated mechanism of islet amyloidosis-induced proteotoxicity. In human diabetic pancreas and in cellular and mouse models of islet amyloidosis, increased expression of the receptor for advanced glycation endproducts (RAGE) correlated with human IAPP-induced (h-IAPP-induced) β cell and islet inflammation, toxicity, and apoptosis. RAGE selectively bound toxic intermediates, but not nontoxic forms of h-IAPP, including amyloid fibrils. The isolated extracellular ligand-binding domains of soluble RAGE (sRAGE) blocked both h-IAPP toxicity and amyloid formation. Inhibition of the interaction between h-IAPP and RAGE by sRAGE, RAGE-blocking antibodies, or genetic RAGE deletion protected pancreatic islets, β cells, and smooth muscle cells from h-IAPP-induced inflammation and metabolic dysfunction. sRAGE-treated h-IAPP Tg mice were protected from amyloid deposition, loss of β cell area, β cell inflammation, stress, apoptosis, and glucose intolerance. These findings establish RAGE as a mediator of IAPP-induced toxicity and suggest that targeting the IAPP/RAGE axis is a potential strategy to mitigate this source of β cell dysfunction in metabolic disease.
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Affiliation(s)
- Andisheh Abedini
- Diabetes Research Program, Division of Endocrinology, Diabetes and Metabolism, NYU School of Medicine, New York, New York, USA
| | - Ping Cao
- Department of Chemistry, Stony Brook University, Stony Brook, New York, USA
| | | | - Jinghua Zhang
- Diabetes Research Program, Division of Endocrinology, Diabetes and Metabolism, NYU School of Medicine, New York, New York, USA
| | - Meilun He
- Diabetes Research Program, Division of Endocrinology, Diabetes and Metabolism, NYU School of Medicine, New York, New York, USA
| | - Julia Derk
- Diabetes Research Program, Division of Endocrinology, Diabetes and Metabolism, NYU School of Medicine, New York, New York, USA
| | - Sachi A Patil
- Diabetes Research Program, Division of Endocrinology, Diabetes and Metabolism, NYU School of Medicine, New York, New York, USA
| | - Rosa Rosario
- Diabetes Research Program, Division of Endocrinology, Diabetes and Metabolism, NYU School of Medicine, New York, New York, USA
| | - Jacqueline Lonier
- Diabetes Research Program, Division of Endocrinology, Diabetes and Metabolism, NYU School of Medicine, New York, New York, USA
| | - Fei Song
- Diabetes Research Program, Division of Endocrinology, Diabetes and Metabolism, NYU School of Medicine, New York, New York, USA
| | - Hyunwook Koh
- Division of Biostatistics, Department of Population Health, NYU School of Medicine, New York, New York, USA
| | - Huilin Li
- Division of Biostatistics, Department of Population Health, NYU School of Medicine, New York, New York, USA
| | - Daniel P Raleigh
- Department of Chemistry, Stony Brook University, Stony Brook, New York, USA
| | - Ann Marie Schmidt
- Diabetes Research Program, Division of Endocrinology, Diabetes and Metabolism, NYU School of Medicine, New York, New York, USA
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31
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Profit AA, Desamero RZB. Development of Peptide-Based Inhibitors of Amylin Aggregation Employing Aromatic and Electrostatic Repulsion. Methods Mol Biol 2018; 1824:17-31. [PMID: 30039399 DOI: 10.1007/978-1-4939-8630-9_2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Human islet amyloid polypeptide (hIAPP) is a 37-residue hormone that is co-stored and co-secreted with insulin. In type 2 diabetes, the polypeptide misfolds to form amyloid plaques in the pancreas. The self-assembly of hIAPP has been linked to the loss of insulin production and β-cell death. Recent investigations have revealed that soluble oligomers of hIAPP are the cytotoxic species responsible for β-cell death and not insoluble amyloid fibrils. Compounds that prevent the self-assembly of hIAPP or drive self-assembly to the state of innocuous insoluble amyloid may be of potential therapeutic value. In this report we summarize key methods employed in our efforts to identify peptide-based modulators of amylin self-assembly that utilize π-electronic effects or electrostatic charge repulsion. These peptide-based modulators may serve as lead compounds for the development of more drug-like molecules and demonstrate that tuning π-electron density and employing charged amyloid disrupting elements are viable approaches toward the design of potential amyloid inhibitors.
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Affiliation(s)
- Adam A Profit
- Department of Chemistry, York College and The Institute for Macromolecular Assemblies, Jamaica, NY, USA.
- Ph.D. Programs in Chemistry and Biochemistry, The Graduate Center of the City University of New York, New York, NY, USA.
| | - Ruel Z B Desamero
- Department of Chemistry, York College and The Institute for Macromolecular Assemblies, Jamaica, NY, USA.
- Ph.D. Programs in Chemistry and Biochemistry, The Graduate Center of the City University of New York, New York, NY, USA.
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32
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Ren B, Liu Y, Zhang Y, Zhang M, Sun Y, Liang G, Xu J, Zheng J. Tanshinones inhibit hIAPP aggregation, disaggregate preformed hIAPP fibrils, and protect cultured cells. J Mater Chem B 2018; 6:56-67. [DOI: 10.1039/c7tb02538f] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Tanshinones act as common inhibitors to inhibit the aggregation of both hIAPP and Aβ, disaggregate preformed hIAPP and Aβ amyloid fibrils, and protect cells from hIAPP- and Aβ-induced toxicity.
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Affiliation(s)
- Baiping Ren
- Hunan Key Laboratory of Biomedical Nanomaterials and Devices
- College of Life Science and Chemistry
- Hunan University of Technology
- Zhuzhou 412007
- P. R. China
| | - Yonglan Liu
- Department of Chemical & Biomolecular Engineering
- The University of Akron
- Ohio 44325
- USA
| | - Yanxian Zhang
- Department of Chemical & Biomolecular Engineering
- The University of Akron
- Ohio 44325
- USA
| | - Mingzhen Zhang
- Department of Chemical & Biomolecular Engineering
- The University of Akron
- Ohio 44325
- USA
| | - Yan Sun
- Department of Biochemical Engineering
- Key Laboratory of Systems Bioengineering of the Ministry of Education School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
- China
| | - Guizhao Liang
- Key Laboratory of Biorheological Science and Technology
- Ministry of Education College
- Chongqing University
- Chongqing 400044
- China
| | - Jianxiong Xu
- Hunan Key Laboratory of Biomedical Nanomaterials and Devices
- College of Life Science and Chemistry
- Hunan University of Technology
- Zhuzhou 412007
- P. R. China
| | - Jie Zheng
- Department of Chemical & Biomolecular Engineering
- The University of Akron
- Ohio 44325
- USA
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33
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Krotee P, Griner SL, Sawaya MR, Cascio D, Rodriguez JA, Shi D, Philipp S, Murray K, Saelices L, Lee J, Seidler P, Glabe CG, Jiang L, Gonen T, Eisenberg DS. Common fibrillar spines of amyloid-β and human islet amyloid polypeptide revealed by microelectron diffraction and structure-based inhibitors. J Biol Chem 2017; 293:2888-2902. [PMID: 29282295 DOI: 10.1074/jbc.m117.806109] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Revised: 12/18/2017] [Indexed: 01/21/2023] Open
Abstract
Amyloid-β (Aβ) and human islet amyloid polypeptide (hIAPP) aggregate to form amyloid fibrils that deposit in tissues and are associated with Alzheimer's disease (AD) and type II diabetes (T2D), respectively. Individuals with T2D have an increased risk of developing AD, and conversely, AD patients have an increased risk of developing T2D. Evidence suggests that this link between AD and T2D might originate from a structural similarity between aggregates of Aβ and hIAPP. Using the cryoEM method microelectron diffraction, we determined the atomic structures of 11-residue segments from both Aβ and hIAPP, termed Aβ(24-34) WT and hIAPP(19-29) S20G, with 64% sequence similarity. We observed a high degree of structural similarity between their backbone atoms (0.96-Å root mean square deviation). Moreover, fibrils of these segments induced amyloid formation through self- and cross-seeding. Furthermore, inhibitors designed for one segment showed cross-efficacy for full-length Aβ and hIAPP and reduced cytotoxicity of both proteins, although by apparently blocking different cytotoxic mechanisms. The similarity of the atomic structures of Aβ(24-34) WT and hIAPP(19-29) S20G offers a molecular model for cross-seeding between Aβ and hIAPP.
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Affiliation(s)
- Pascal Krotee
- Howard Hughes Medical Institute, UCLA-United States Department of Energy (DOE) Institute, Departments of Biological Chemistry and Chemistry and Biochemistry, Molecular Biology Institute, UCLA, Los Angeles, California 90095
| | - Sarah L Griner
- Howard Hughes Medical Institute, UCLA-United States Department of Energy (DOE) Institute, Departments of Biological Chemistry and Chemistry and Biochemistry, Molecular Biology Institute, UCLA, Los Angeles, California 90095
| | - Michael R Sawaya
- Howard Hughes Medical Institute, UCLA-United States Department of Energy (DOE) Institute, Departments of Biological Chemistry and Chemistry and Biochemistry, Molecular Biology Institute, UCLA, Los Angeles, California 90095
| | - Duilio Cascio
- Howard Hughes Medical Institute, UCLA-United States Department of Energy (DOE) Institute, Departments of Biological Chemistry and Chemistry and Biochemistry, Molecular Biology Institute, UCLA, Los Angeles, California 90095
| | - Jose A Rodriguez
- Howard Hughes Medical Institute, UCLA-United States Department of Energy (DOE) Institute, Departments of Biological Chemistry and Chemistry and Biochemistry, Molecular Biology Institute, UCLA, Los Angeles, California 90095
| | - Dan Shi
- Howard Hughes Medical Institute, Janelia Research Campus, Ashburn, Virginia 20147
| | - Stephan Philipp
- Department of Molecular Biology and Biochemistry, University of California, Irvine, California 92697
| | - Kevin Murray
- Howard Hughes Medical Institute, UCLA-United States Department of Energy (DOE) Institute, Departments of Biological Chemistry and Chemistry and Biochemistry, Molecular Biology Institute, UCLA, Los Angeles, California 90095
| | - Lorena Saelices
- Howard Hughes Medical Institute, UCLA-United States Department of Energy (DOE) Institute, Departments of Biological Chemistry and Chemistry and Biochemistry, Molecular Biology Institute, UCLA, Los Angeles, California 90095
| | - Ji Lee
- Howard Hughes Medical Institute, UCLA-United States Department of Energy (DOE) Institute, Departments of Biological Chemistry and Chemistry and Biochemistry, Molecular Biology Institute, UCLA, Los Angeles, California 90095
| | - Paul Seidler
- Howard Hughes Medical Institute, UCLA-United States Department of Energy (DOE) Institute, Departments of Biological Chemistry and Chemistry and Biochemistry, Molecular Biology Institute, UCLA, Los Angeles, California 90095
| | - Charles G Glabe
- Department of Molecular Biology and Biochemistry, University of California, Irvine, California 92697; Biochemistry Department, Faculty of Science and Experimental Biochemistry Unit, King Fahd Medical Research Center, King Abdulaziz University, Jeddah 22252, Saudi Arabia
| | - Lin Jiang
- Department of Neurology, Molecular Biology Institute, and Brain Research Institute (BRI), David Geffen School of Medicine, UCLA, Los Angeles, California, 90095
| | - Tamir Gonen
- Howard Hughes Medical Institute, Janelia Research Campus, Ashburn, Virginia 20147
| | - David S Eisenberg
- Howard Hughes Medical Institute, UCLA-United States Department of Energy (DOE) Institute, Departments of Biological Chemistry and Chemistry and Biochemistry, Molecular Biology Institute, UCLA, Los Angeles, California 90095.
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34
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Obasse I, Taylor M, Fullwood NJ, Allsop D. Development of proteolytically stable N-methylated peptide inhibitors of aggregation of the amylin peptide implicated in type 2 diabetes. Interface Focus 2017; 7:20160127. [PMID: 29147551 DOI: 10.1098/rsfs.2016.0127] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Islet amyloid polypeptide, also known as amylin, is the main component of the amyloid deposits present in approximately 90% of people with type 2 diabetes mellitus (T2DM). In this disease, amylin aggregates into multimeric β-pleated sheet structures which cause damage to pancreatic islet β-cells. Inhibitors of early-stage amylin aggregation could therefore provide a disease-modifying treatment for T2DM. In this study, overlapping peptides were designed to target the 'binding' region (RLANFLVHSS, residues 11-20) of human amylin, and their effects on amyloid fibril formation were determined by thioflavin-T assay. The first generation peptides showed less than 50% inhibition of aggregation, but a second generation peptide (H2N-RGANFLVHGR-CONH2) showed strong inhibitory effects on amylin aggregation, and this was confirmed by negative stain electron microscopy. Cytotoxicity studies revealed that this peptide protected human pancreatic 1.4E7 (ECACC 10070102) insulin-secreting cells from the toxic effects of human amylin. Unlike the retro-inverso version of this peptide, which stimulated aggregation, two N-methylated peptides (H2N-RGAmNFmLVmHGR-CONH2 and H2N-RGANmFLmVHmR-CONH2) gave very clear dose-dependent inhibition of fibril formation. These two peptides were also stable against a range of different proteolytic enzymes, and in human plasma. These N-methylated peptides could provide a novel treatment for slowing progression of T2DM.
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Affiliation(s)
- Idira Obasse
- Division of Biomedical and Life Sciences, Faculty of Health and Medicine, University of Lancaster, Lancaster LA1 4YQ, UK
| | - Mark Taylor
- Division of Biomedical and Life Sciences, Faculty of Health and Medicine, University of Lancaster, Lancaster LA1 4YQ, UK
| | - Nigel J Fullwood
- Division of Biomedical and Life Sciences, Faculty of Health and Medicine, University of Lancaster, Lancaster LA1 4YQ, UK
| | - David Allsop
- Division of Biomedical and Life Sciences, Faculty of Health and Medicine, University of Lancaster, Lancaster LA1 4YQ, UK
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35
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Du W, Gong G, Wang W, Xu J. Regulation of the aggregation behavior of human islet amyloid polypeptide fragment by titanocene complexes. J Biol Inorg Chem 2017; 22:1065-1074. [DOI: 10.1007/s00775-017-1484-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Accepted: 07/27/2017] [Indexed: 01/09/2023]
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36
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Profit AA, Vedad J, Desamero RZB. Peptide Conjugates of Benzene Carboxylic Acids as Agonists and Antagonists of Amylin Aggregation. Bioconjug Chem 2017; 28:666-677. [PMID: 28071890 DOI: 10.1021/acs.bioconjchem.6b00732] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Human islet amyloid polypeptide (hIAPP), also known as amylin, is a 37 residue peptide hormone that is stored and co-secreted with insulin. hIAPP plays a pivotal role in type 2 diabetes and is the major component of amyloid deposits found in the pancreas of patients afflicted with the disease. The self-assembly of hIAPP and the formation of amyloid is linked to the death of insulin producing β-cells. Recent findings suggest that soluble hIAPP oligomers are the cytotoxic species responsible for β-cell loss whereas amyloid fibrils themselves may indeed be innocuous. Potential avenues of therapeutic intervention include the development of compounds that prevent hIAPP self-assembly as well as those that reduce or eliminate lag time and rapidly accelerate the formation of amyloid fibrils. Both of these approaches minimize temporal exposure to soluble cytotoxic hIAPP oligomers. Toward this end our laboratory has pursued an electrostatic repulsion approach to the development of potential inhibitors and modulators of hIAPP self-assembly. Peptide conjugates were constructed in which benzene carboxylic acids of varying charge were employed as electrostatic disrupting elements and appended to the N-terminal of the hIAPP22-29 (NFGAILSS) self-recognition sequence. The self-assembly kinetics of conjugates were characterized by turbidity measurements and the structure of aggregates probed by Raman and CD spectroscopy while the morphology was assessed using transmission electron microscopy. Several benzene carboxylic acid peptide conjugates failed to self-assemble and some were found to inhibit the aggregation of full-length amylin while others served to enhance the rate of amyloid formation and/or increase the yield of amyloid produced. Studies reveal that the geometric display of free carboxylates on the benzene ring of the conjugates plays an important role in the activity of conjugates. In addition, a number of free benzene carboxylic acids were found to modulate amylin self-assembly on their own. The results of these investigations confirm the viability of the electrostatic repulsion approach to the modulation of amyloid formation and may aid the design and development of potential therapeutic agents.
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Affiliation(s)
- Adam A Profit
- Department of Chemistry, York College and The Institute for Macromolecular Assemblies , Jamaica, New York 11451, United States.,Ph.D. Programs in Chemistry and Biochemistry, The Graduate Center of the City University of New York , New York, New York 10016, United States
| | - Jayson Vedad
- Department of Chemistry, York College and The Institute for Macromolecular Assemblies , Jamaica, New York 11451, United States.,Ph.D. Programs in Chemistry and Biochemistry, The Graduate Center of the City University of New York , New York, New York 10016, United States
| | - Ruel Z B Desamero
- Department of Chemistry, York College and The Institute for Macromolecular Assemblies , Jamaica, New York 11451, United States.,Ph.D. Programs in Chemistry and Biochemistry, The Graduate Center of the City University of New York , New York, New York 10016, United States
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37
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Disaggregation of Amylin Aggregate by Novel Conformationally Restricted Aminobenzoic Acid containing α/β and α/γ Hybrid Peptidomimetics. Sci Rep 2017; 7:40095. [PMID: 28054630 PMCID: PMC5214534 DOI: 10.1038/srep40095] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2016] [Accepted: 12/01/2016] [Indexed: 11/24/2022] Open
Abstract
Diabetes has emerged as a threat to the current world. More than ninety five per cent of all the diabetic population has type 2 diabetes mellitus (T2DM). Aggregates of Amylin hormone, which is co-secreted with insulin from the pancreatic β-cells, inhibit the activities of insulin and glucagon and cause T2DM. Importance of the conformationally restricted peptides for drug design against T2DM has been invigorated by recent FDA approval of Symlin, which is a large conformationally restricted peptide. However, Symlin still has some issues including solubility, oral bioavailability and cost of preparation. Herein, we introduced a novel strategy for conformationally restricted peptide design adopting a minimalistic approach for cost reduction. We have demonstrated efficient inhibition of amyloid formation of Amylin and its disruption by a novel class of conformationally restricted β-sheet breaker hybrid peptidomimetics (BSBHps). We have inserted β, γ and δ -aminobenzoic acid separately into an amyloidogenic peptide sequence, synthesized α/β, α/γ and α/δ hybrid peptidomimetics, respectively. Interestingly, we observed the aggregation inhibitory efficacy of α/β and α/γ BSBHps, but not of α/δ analogues. They also disrupt existing amyloids into non-toxic forms. Results may be useful for newer drug design against T2DM as well as other amyloidoses and understanding amyloidogenesis.
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38
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Krotee P, Rodriguez JA, Sawaya MR, Cascio D, Reyes FE, Shi D, Hattne J, Nannenga BL, Oskarsson ME, Philipp S, Griner S, Jiang L, Glabe CG, Westermark GT, Gonen T, Eisenberg DS. Atomic structures of fibrillar segments of hIAPP suggest tightly mated β-sheets are important for cytotoxicity. eLife 2017; 6. [PMID: 28045370 PMCID: PMC5207774 DOI: 10.7554/elife.19273] [Citation(s) in RCA: 85] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2016] [Accepted: 12/01/2016] [Indexed: 01/09/2023] Open
Abstract
hIAPP fibrils are associated with Type-II Diabetes, but the link of hIAPP structure to islet cell death remains elusive. Here we observe that hIAPP fibrils are cytotoxic to cultured pancreatic β-cells, leading us to determine the structure and cytotoxicity of protein segments composing the amyloid spine of hIAPP. Using the cryoEM method MicroED, we discover that one segment, 19-29 S20G, forms pairs of β-sheets mated by a dry interface that share structural features with and are similarly cytotoxic to full-length hIAPP fibrils. In contrast, a second segment, 15-25 WT, forms non-toxic labile β-sheets. These segments possess different structures and cytotoxic effects, however, both can seed full-length hIAPP, and cause hIAPP to take on the cytotoxic and structural features of that segment. These results suggest that protein segment structures represent polymorphs of their parent protein and that segment 19-29 S20G may serve as a model for the toxic spine of hIAPP.
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Affiliation(s)
- Pascal Krotee
- Department of Biological Chemistry, Howard Hughes Medical Institute, University of California, Los Angeles, Los Angeles, United States.,Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, United States.,Molecular Biology Institute, University of California, Los Angeles, Los Angeles, United States.,UCLA-DOE Institute, University of California, Los Angeles, Los Angeles, United States
| | - Jose A Rodriguez
- Department of Biological Chemistry, Howard Hughes Medical Institute, University of California, Los Angeles, Los Angeles, United States.,Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, United States.,UCLA-DOE Institute, University of California, Los Angeles, Los Angeles, United States
| | - Michael R Sawaya
- Department of Biological Chemistry, Howard Hughes Medical Institute, University of California, Los Angeles, Los Angeles, United States.,Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, United States.,UCLA-DOE Institute, University of California, Los Angeles, Los Angeles, United States
| | - Duilio Cascio
- Department of Biological Chemistry, Howard Hughes Medical Institute, University of California, Los Angeles, Los Angeles, United States.,Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, United States.,UCLA-DOE Institute, University of California, Los Angeles, Los Angeles, United States
| | - Francis E Reyes
- Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, United States
| | - Dan Shi
- Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, United States
| | - Johan Hattne
- Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, United States
| | - Brent L Nannenga
- Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, United States
| | - Marie E Oskarsson
- Department of Medical Cell Biology, Uppsala University, Uppsala, Sweden
| | - Stephan Philipp
- Department of Molecular Biology and Biochemistry, University of California, Irvine, Irvine, United States
| | - Sarah Griner
- Department of Biological Chemistry, Howard Hughes Medical Institute, University of California, Los Angeles, Los Angeles, United States.,Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, United States.,UCLA-DOE Institute, University of California, Los Angeles, Los Angeles, United States
| | - Lin Jiang
- Molecular Biology Institute, University of California, Los Angeles, Los Angeles, United States.,Department of Neurology, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, United States.,Brain Research Institute (BRI), University of California, Los Angeles, Los Angeles, United States
| | - Charles G Glabe
- Department of Molecular Biology and Biochemistry, University of California, Irvine, Irvine, United States.,Biochemistry Department, Faculty of Science and Experimental Biochemistry Unit, King Fahd Medical Research Center, King Abdulaziz University, Jeddah, Saudi Arabia
| | | | - Tamir Gonen
- Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, United States
| | - David S Eisenberg
- Department of Biological Chemistry, Howard Hughes Medical Institute, University of California, Los Angeles, Los Angeles, United States.,Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, United States.,Molecular Biology Institute, University of California, Los Angeles, Los Angeles, United States.,UCLA-DOE Institute, University of California, Los Angeles, Los Angeles, United States
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39
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vandenAkker CC, Deckert-Gaudig T, Schleeger M, Velikov KP, Deckert V, Bonn M, Koenderink GH. Nanoscale Heterogeneity of the Molecular Structure of Individual hIAPP Amyloid Fibrils Revealed with Tip-Enhanced Raman Spectroscopy. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2015; 11:4131-4139. [PMID: 25952953 DOI: 10.1002/smll.201500562] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Indexed: 06/04/2023]
Abstract
Type 2 diabetes mellitus is characterized by the pathological deposition of fibrillized protein, known as amyloids. It is thought that oligomers and/or amyloid fibrils formed from human islet amyloid polypeptide (hIAPP or amylin) cause cell death by membrane damage. The molecular structure of hIAPP amyloid fibrils is dominated by β-sheet structure, as probed with conventional infrared and Raman vibrational spectroscopy. However, with these techniques it is not possible to distinguish between the core and the surface structure of the fibrils. Since the fibril surface crucially affects amyloid toxicity, it is essential to know its structure. Here the surface molecular structure and amino acid residue composition of hIAPP fibrils are specifically probed with nanoscale resolution using tip-enhanced Raman spectroscopy (TERS). The fibril surface mainly contains unordered or α-helical structures, in contrast to the β-sheet-rich core. This experimentally validates recent models of hIAPP amyloids based on NMR measurements. Spatial mapping of the surface structure reveals a highly heterogeneous surface structure. Finally, TERS can probe fibrils formed on a lipid interface, which is more representative of amyloids in vivo.
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Affiliation(s)
| | - Tanja Deckert-Gaudig
- Leibniz Institute of Photonic Technology, Albert-Einstein-Straße 9, 07745, Jena, Germany
| | - Michael Schleeger
- Department of Molecular Spectroscopy, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Krassimir P Velikov
- Soft Condensed Matter, Debye Institute for Nanomaterials Science, Department of Physics and Astronomy, Utrecht University, Princetonplein 5, 3584, CC, Utrecht, The Netherlands
- Unilever Research Labs, NL-3133 AT Vlaardingen, The Netherlands
| | - Volker Deckert
- Leibniz Institute of Photonic Technology, Albert-Einstein-Straße 9, 07745, Jena, Germany
- Institute for Physical Chemistry and Abbe Center of Photonics, University of Jena, Helmholtzweg 4, 07743, Jena, Germany
| | - Mischa Bonn
- Department of Molecular Spectroscopy, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
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40
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Zhang M, Hu R, Chen H, Chang Y, Ma J, Liang G, Mi J, Wang Y, Zheng J. Polymorphic cross-seeding amyloid assemblies of amyloid-β and human islet amyloid polypeptide. Phys Chem Chem Phys 2015; 17:23245-56. [PMID: 26283068 DOI: 10.1039/c5cp03329b] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Epidemiological studies have shown that the development of Alzheimer's disease (AD) is associated with type 2 diabetes (T2D), but it still remains unclear how AD and T2D are connected. Heterologous cross-seeding between the causative peptides of Aβ and hIAPP may represent a molecular link between AD and T2D. Here, we computationally modeled and simulated a series of cross-seeding double-layer assemblies formed by Aβ and hIAPP peptides using all-atom and coarse-gained molecular dynamics (MD) simulations. The cross-seeding Aβ-hIAPP assemblies showed a wide range of polymorphic structures via a combination of four β-sheet-to-β-sheet interfaces and two packing orientations, focusing on a comparison of different matches of β-sheet layers. Two cross-seeding Aβ-hIAPP assemblies with different interfacial β-sheet packings exhibited high structural stability and favorable interfacial interactions in both oligomeric and fibrillar states. Both Aβ-hIAPP assemblies displayed interfacial dehydration to different extents, which in turn promoted Aβ-hIAPP association depending on interfacial polarity and geometry. Furthermore, computational mutagenesis studies revealed that disruption of interfacial salt bridges largely disfavor the β-sheet-to-β-sheet association, highlighting the importance of salt bridges in the formation of cross-seeding assemblies. This work provides atomic-level information on the cross-seeding interactions between Aβ and hIAPP, which may be involved in the interplay between these two disorders.
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Affiliation(s)
- Mingzhen Zhang
- Department of Chemical and Biomolecular Engineering, The University of Akron, Akron, Ohio 44325, USA.
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41
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Zhang M, Hu R, Chen H, Gong X, Zhou F, Zhang L, Zheng J. Polymorphic Associations and Structures of the Cross-Seeding of Aβ1–42 and hIAPP1–37 Polypeptides. J Chem Inf Model 2015; 55:1628-39. [DOI: 10.1021/acs.jcim.5b00166] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
| | | | | | | | - Feimeng Zhou
- Department
of Chemistry and Biochemistry, California State University, Los Angeles, Los Angeles, California 90032, United States
| | - Li Zhang
- Department
of Geriatric Neurology, Nanjing Brain Hospital Affiliated to Nanjing Medical University, Nanjing, Jiangsu 210029, China
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42
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Ashraf GM, Greig NH, Khan TA, Hassan I, Tabrez S, Shakil S, Sheikh IA, Zaidi SK, Akram M, Jabir NR, Firoz CK, Naeem A, Alhazza IM, Damanhouri GA, Kamal MA. Protein misfolding and aggregation in Alzheimer's disease and type 2 diabetes mellitus. CNS & NEUROLOGICAL DISORDERS-DRUG TARGETS 2015; 13:1280-93. [PMID: 25230234 DOI: 10.2174/1871527313666140917095514] [Citation(s) in RCA: 107] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2014] [Revised: 05/11/2014] [Accepted: 05/12/2014] [Indexed: 12/27/2022]
Abstract
In general, proteins can only execute their various biological functions when they are appropriately folded. Their amino acid sequence encodes the relevant information required for correct three-dimensional folding, with or without the assistance of chaperones. The challenge associated with understanding protein folding is currently one of the most important aspects of the biological sciences. Misfolded protein intermediates form large polymers of unwanted aggregates and are involved in the pathogenesis of many human diseases, including Alzheimer's disease (AD) and Type 2 diabetes mellitus (T2DM). AD is one of the most prevalent neurological disorders and has worldwide impact; whereas T2DM is considered a metabolic disease that detrementally influences numerous organs, afflicts some 8% of the adult population, and shares many risk factors with AD. Research data indicates that there is a widespread conformational change in the proteins involved in AD and T2DM that form β-sheet like motifs. Although conformation of these β-sheets is common to many functional proteins, the transition from α-helix to β-sheet is a typical characteristic of amyloid deposits. Any abnormality in this transition results in protein aggregation and generation of insoluble fibrils. The abnormal and toxic proteins can interact with other native proteins and consequently catalyze their transition into the toxic state. Both AD and T2DM are prevalent in the aged population. AD is characterized by the accumulation of amyloid-β (Aβ) in brain, while T2DM is characterized by the deposition of islet amyloid polypeptide (IAPP, also known as amylin) within beta-cells of the pancreas. T2DM increases pathological angiogenesis and immature vascularisation. This also leads to chronic cerebral hypoperfusion, which results in dysfunction and degeneration of neuroglial cells. With an abundance of common mechanisms underpinning both disorders, a significant question that can be posed is whether T2DM leads to AD in aged individuals and the associations between other protein misfolding diseases.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | | | | | - Mohammad A Kamal
- King Fahd Medical Research Center, King Abdulaziz University, P. O. Box 80216, Jeddah 21589, Kingdom of Saudi Arabia.
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43
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Lopes DHJ, Attar A, Nair G, Hayden EY, Du Z, McDaniel K, Dutt S, Bandmann H, Bravo-Rodriguez K, Mittal S, Klärner FG, Wang C, Sanchez-Garcia E, Schrader T, Bitan G. Molecular tweezers inhibit islet amyloid polypeptide assembly and toxicity by a new mechanism. ACS Chem Biol 2015; 10:1555-69. [PMID: 25844890 DOI: 10.1021/acschembio.5b00146] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
In type-2 diabetes (T2D), islet amyloid polypeptide (IAPP) self-associates into toxic assemblies causing islet β-cell death. Therefore, preventing IAPP toxicity is a promising therapeutic strategy for T2D. The molecular tweezer CLR01 is a supramolecular tool for selective complexation of K residues in (poly)peptides. Surprisingly, it inhibits IAPP aggregation at substoichiometric concentrations even though IAPP has only one K residue at position 1, whereas efficient inhibition of IAPP toxicity requires excess CLR01. The basis for this peculiar behavior is not clear. Here, a combination of biochemical, biophysical, spectroscopic, and computational methods reveals a detailed mechanistic picture of the unique dual inhibition mechanism for CLR01. At low concentrations, CLR01 binds to K1, presumably nucleating nonamyloidogenic, yet toxic, structures, whereas excess CLR01 binds also to R11, leading to nontoxic structures. Encouragingly, the CLR01 concentrations needed for inhibition of IAPP toxicity are safe in vivo, supporting its development toward disease-modifying therapy for T2D.
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Affiliation(s)
| | | | | | | | - Zhenming Du
- Department of Biology, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | | | - Som Dutt
- Institute of Organic Chemistry, University of Duisburg-Essen, 45141 Essen, Germany
| | - Heinz Bandmann
- Institute of Organic Chemistry, University of Duisburg-Essen, 45141 Essen, Germany
| | | | - Sumit Mittal
- Max-Planck-Institut für Kohlenforschung, 45470 Mülheim an der Ruhr, Germany
| | - Frank-Gerrit Klärner
- Institute of Organic Chemistry, University of Duisburg-Essen, 45141 Essen, Germany
| | - Chunyu Wang
- Department of Biology, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | | | - Thomas Schrader
- Institute of Organic Chemistry, University of Duisburg-Essen, 45141 Essen, Germany
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44
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Profit AA, Vedad J, Saleh M, Desamero RZB. Aromaticity and amyloid formation: effect of π-electron distribution and aryl substituent geometry on the self-assembly of peptides derived from hIAPP(22-29). Arch Biochem Biophys 2015; 567:46-58. [PMID: 25524740 PMCID: PMC5490837 DOI: 10.1016/j.abb.2014.12.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2014] [Revised: 11/26/2014] [Accepted: 12/07/2014] [Indexed: 10/24/2022]
Abstract
A comprehensive investigation of peptides derived from the 22-29 region of human islet amyloid polypeptide (hIAPP) that contain phenylalanine analogs at position 23 with a variety of electron donating and withdrawing groups, along with heteroaromatic surrogates, has been employed to interrogate how π-electron distribution effects amyloid formation. Kinetic aggregation studies using turbidity measurements indicate that electron rich aromatic ring systems consistently abolish the amyloidogenic propensity of hIAPP(22-29). Electron poor systems modulate the rate of aggregation. Raman and Fourier transform infrared spectroscopy confirm the parallel β-sheet secondary structure of aggregates derived from peptides containing electron poor phenylalanine analogs and provide direct evidence of ring stacking. Transmission electron microscopy confirms the presence of amyloid fibrils. The effect of aryl substituent geometry on peptide self-assembly reveals that the electronic nature of substituents and not their steric profile is responsible for failure of the electron donating group peptides to aggregate. Non-aggregating hIAPP(22-29) peptides were found to inhibit the self-assembly of full-length hIAPP(1-37). The most potent inhibitory peptides contain phenylalanine with the p-amino and p-formamido functionalities. These novel peptides may serve as leads for the development of future aggregation inhibitors. A potential mechanism for inhibition of amylin self-assembly by electron rich (-29) peptides is proposed.
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Affiliation(s)
- Adam A Profit
- York College, Institute for Macromolecular Assemblies and the Graduate Center of the City University of New York, Jamaica, NY 11451, United States.
| | - Jayson Vedad
- York College, Institute for Macromolecular Assemblies and the Graduate Center of the City University of New York, Jamaica, NY 11451, United States
| | - Mohamad Saleh
- York College, Institute for Macromolecular Assemblies and the Graduate Center of the City University of New York, Jamaica, NY 11451, United States
| | - Ruel Z B Desamero
- York College, Institute for Macromolecular Assemblies and the Graduate Center of the City University of New York, Jamaica, NY 11451, United States.
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45
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Zhang S, Liu H, Chuang CL, Li X, Au M, Zhang L, Phillips ARJ, Scott DW, Cooper GJS. The pathogenic mechanism of diabetes varies with the degree of overexpression and oligomerization of human amylin in the pancreatic islet β cells. FASEB J 2014; 28:5083-96. [PMID: 25138158 DOI: 10.1096/fj.14-251744] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The aggregation of human amylin (hA) to form cytotoxic structures has been closely associated with the causation of type 2 diabetes. We sought to advance understanding of how altered expression and aggregation of hA might link β-cell degeneration with diabetes onset and progression, by comparing phenotypes between homozygous and hemizygous hA-transgenic mice. The homozygous mice displayed elevated islet hA that correlated positively with measures of oligomer formation (r=0.91; P<0.0001). They also developed hyperinsulinemia with transient insulin resistance during the prediabetes stage and then underwent rapid β-cell loss, culminating in severe juvenile-onset diabetes. The prediabetes stage was prolonged in the hemizygous mice, wherein β-cell dysfunction and extensive oligomer formation occurred in adulthood at a much later stage, when hA levels were lower (r=-0.60; P<0.0001). This is the first report to show that hA-evoked diabetes is associated with age, insulin resistance, progressive islet dysfunction, and β-cell apoptosis, which interact variably to cause the different diabetes syndromes. The various levels of hA elevation cause different extents of oligomer formation in the disease stages, thus eliciting early- or adult-onset diabetes syndromes, reminiscent of type 1 and 2 diabetes, respectively. Thus, the hA-evoked diabetes phenotypes differ substantively according to degree of amylin overproduction. These findings are relevant to the understanding of the pathogenesis and the development of experimental therapeutics for diabetes.
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Affiliation(s)
- Shaoping Zhang
- The School of Biological Sciences and The Maurice Wilkins Centre for Molecular BioDiscovery, Faculty of Science, University of Auckland, Auckland, New Zealand
| | - Hong Liu
- The School of Biological Sciences and
| | | | | | - Maggie Au
- The School of Biological Sciences and
| | - Lin Zhang
- The School of Biological Sciences and
| | - Anthony R J Phillips
- The School of Biological Sciences and The Maurice Wilkins Centre for Molecular BioDiscovery, Faculty of Science, University of Auckland, Auckland, New Zealand
| | | | - Garth J S Cooper
- The School of Biological Sciences and The Maurice Wilkins Centre for Molecular BioDiscovery, Faculty of Science, University of Auckland, Auckland, New Zealand Centre for Advanced Discovery and Experimental Therapeutics, Central Manchester University Hospitals National Health Service (NHS) Foundation Trust, Manchester, UK; and Centre for Endocrinology and Diabetes, Institute of Human Development, Faculty of Medical and Human Sciences, Manchester Academic Health Sciences Centre, The University of Manchester, Manchester, UK
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46
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Zhang M, Hu R, Liang G, Chang Y, Sun Y, Peng Z, Zheng J. Structural and Energetic Insight into the Cross-Seeding Amyloid Assemblies of Human IAPP and Rat IAPP. J Phys Chem B 2014; 118:7026-36. [DOI: 10.1021/jp5022246] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Mingzhen Zhang
- Department
of Chemical and Biomolecular Engineering, The University of Akron, Akron, Ohio 44325, United States
| | - Rundong Hu
- Department
of Chemical and Biomolecular Engineering, The University of Akron, Akron, Ohio 44325, United States
| | - Guizhao Liang
- Key
Laboratory of Biorheological Science and Technology, Ministry of Education,
Bioengineering College, Chongqing University, Chongqing 400044, China
| | - Yung Chang
- R&D Center for Membrane Technology and Department of Chemical Engineering, Chung Yuan University, Chung Li, Taoyuan 320, Taiwan
| | - Yan Sun
- Department
of Biochemical Engineering and Key Laboratory of Systems Bioengineering
of the Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
- Collaborative
Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Zhenmeng Peng
- Department
of Chemical and Biomolecular Engineering, The University of Akron, Akron, Ohio 44325, United States
| | - Jie Zheng
- Department
of Chemical and Biomolecular Engineering, The University of Akron, Akron, Ohio 44325, United States
- Collaborative
Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
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47
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Tomasello MF, Sinopoli A, Attanasio F, Giuffrida ML, Campagna T, Milardi D, Pappalardo G. Molecular and cytotoxic properties of hIAPP17-29 and rIAPP17-29 fragments: a comparative study with the respective full-length parent polypeptides. Eur J Med Chem 2014; 81:442-55. [PMID: 24859763 DOI: 10.1016/j.ejmech.2014.05.038] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2013] [Revised: 04/11/2014] [Accepted: 05/11/2014] [Indexed: 12/20/2022]
Abstract
The human islet polypeptide (hIAPP) or amylin is a 37-residue peptide hormone secreted by β-cells of the islet of Langerhans in the pancreas. Unlike the rat variant of IAPP (rIAPP), human amylin is highly amyloidogenic and is found as amyloid deposits in nearly 95% of patients afflicted with type 2 diabetes mellitus (T2DM). Human and rat IAPP have nearly identical primary sequence differing at only six positions which are encompassed within the 17-29 aminoacid region. Using Circular Dichroism (CD), Dynamic Light Scattering (DLS) and ThT-fluorescence (Th-T), we examined the aggregation properties of both full-length hIAPP1-37 and the related peptide fragment hIAPP17-29. For the sake of comparison, similar experiments were carried out on the respective rat variants rIAPP1-37 and rIAPP17-29. These studies were conducted at physiological pH in buffered solution not containing fluorinated co-solvents as well as in the presence of model membranes (LUV). In addition, the cytotoxic activity of the investigated peptides was determined toward different pancreatic β-cell lines. All the peptide studied in this work resulted cytotoxic despite β-sheet structure being observed, in vitro, for the hIAPP1-37 only. This suggests that β-sheet conformational transition that generally precedes the fibril formation, is not a prerequisite for toxicity towards β-cells. Interestingly, confocal microscopy indicated that the IAPP peptides can enter the cell and might exert their toxic action at an intracellular level.
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Affiliation(s)
| | - Alessandro Sinopoli
- International PhD Program in Translational Biomedicine, University of Catania, V.le A. Doria 6, 95125 Catania, Italy
| | - Francesco Attanasio
- CNR-Institute of Biostructures and Bioimaging, Via P. Gaifami 18, 95126 Catania, Italy
| | - Maria Laura Giuffrida
- CNR-Institute of Biostructures and Bioimaging, Via P. Gaifami 18, 95126 Catania, Italy
| | - Tiziana Campagna
- CNR-Institute of Biostructures and Bioimaging, Via P. Gaifami 18, 95126 Catania, Italy
| | - Danilo Milardi
- CNR-Institute of Biostructures and Bioimaging, Via P. Gaifami 18, 95126 Catania, Italy
| | - Giuseppe Pappalardo
- CNR-Institute of Biostructures and Bioimaging, Via P. Gaifami 18, 95126 Catania, Italy.
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48
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Tripathi AS, Wadhwani PJ, Majumder PM, Chandewar AV, Marathe S, Mahajan PG. Amylin dual action: a second gluco regulatory β-cell hormone, treatment and cause for the diabetes. Int J Diabetes Dev Ctries 2014. [DOI: 10.1007/s13410-014-0203-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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Peinado JR, Sami F, Rajpurohit N, Lindberg I. Blockade of islet amyloid polypeptide fibrillation and cytotoxicity by the secretory chaperones 7B2 and proSAAS. FEBS Lett 2013; 587:3406-11. [PMID: 24042052 DOI: 10.1016/j.febslet.2013.09.006] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2013] [Revised: 09/03/2013] [Accepted: 09/06/2013] [Indexed: 10/26/2022]
Abstract
The deposition of fibrillated human islet β-cell peptide islet amyloid polypeptide (hIAPP) into amyloid plaques is characteristic of the pathogenesis of islet cell death during type 2 diabetes. We investigated the effects of the neuroendocrine secretory proteins 7B2 and proSAAS on hIAPP fibrillation in vitro and on cytotoxicity. In vitro, 21-kDa 7B2 and proSAAS blocked hIAPP fibrillation. Structure-function studies showed that a central region within 21-kDa 7B2 is important in this effect and revealed the importance of the N-terminal region of proSAAS. Both chaperones blocked the cytotoxic effects of exogenous hIAPP on Rin5f cells; 7B2 generated by overexpression was also effective. ProSAAS and 7B2 may perform a chaperone role as secretory anti-aggregants in normal islet cell function and in type 2 diabetes.
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Affiliation(s)
- Juan R Peinado
- Department of Anatomy and Neurobiology, University of Maryland-Baltimore, Baltimore, MD 21201, United States
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Profit AA, Felsen V, Chinwong J, Mojica ERE, Desamero RZB. Evidence of π-stacking interactions in the self-assembly of hIAPP(22-29). Proteins 2013; 81:690-703. [PMID: 23229921 PMCID: PMC3594381 DOI: 10.1002/prot.24229] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2012] [Revised: 10/29/2012] [Accepted: 11/28/2012] [Indexed: 12/16/2022]
Abstract
The role aromatic amino acids play in the formation of amyloid is a subject of controversy. In an effort to clarify the contribution of aromaticity to the self-assembly of human islet amyloid polypeptide (hIAPP)22-29 , peptide analogs containing electron donating groups (EDGs) or electron withdrawing groups (EWGs) as substituents on the aromatic ring of Phe-23 at the para position have been synthesized and characterized using turbidity measurements in conjunction with Raman and fluorescence spectroscopy. Results indicate the incorporation of EDGs on the aromatic ring of Phe-23 virtually abolish the ability of hIAPP22-29 to form amyloid. Peptides containing EWGs were still capable of forming aggregates. These aggregates were found to be rich in β-sheet secondary structure. Transmission electron microscopy images of the aggregates confirm the presence of amyloid fibrils. The observed difference in amyloidogenic propensity between peptides containing EDGs and those with EWGs appears not to be based on differences in peptide hydrophobicity. Fluorescence and Raman spectroscopic investigations reveal that the environment surrounding the aromatic ring becomes more hydrophobic and ordered upon aggregation. Furthermore, Raman measurements of peptide analogs containing EWGs, conclusively demonstrate a distinct downshift in the CC ring mode (ca. 1600 cm(-1) ) upon aggregation that has previously been shown to be indicative of π-stacking. While previous work has demonstrated that π-stacking is not an absolute requirement for fibrillization, our findings indicate that Phe-23 also contributes to fibril formation through π-stacking interactions and that it is not only the hydrophobic nature of this residue that is relevant in the self-assembly of hIAPP22-29 . © Proteins 2013. © 2012 Wiley Periodicals, Inc.
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Affiliation(s)
- Adam A. Profit
- York College, Institute for Macromolecular Assemblies and the Graduate Center of the City University of New York, Jamaica, New York, 11451
| | - Valentina Felsen
- York College, Institute for Macromolecular Assemblies and the Graduate Center of the City University of New York, Jamaica, New York, 11451
| | - Justina Chinwong
- York College, Institute for Macromolecular Assemblies and the Graduate Center of the City University of New York, Jamaica, New York, 11451
| | - Elmer-Rico E. Mojica
- York College, Institute for Macromolecular Assemblies and the Graduate Center of the City University of New York, Jamaica, New York, 11451
| | - Ruel Z. B. Desamero
- York College, Institute for Macromolecular Assemblies and the Graduate Center of the City University of New York, Jamaica, New York, 11451
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