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Huang F, Huang J, Yan J, Liu Y, Lian J, Sun Q, Ding F, Sun Y. Molecular Insights into the Effects of F16L and F19L Substitutions on the Conformation and Aggregation Dynamics of Human Calcitonin. J Chem Inf Model 2024. [PMID: 38745385 DOI: 10.1021/acs.jcim.4c00553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2024]
Abstract
Human calcitonin (hCT) regulates calcium-phosphorus metabolism, but its amyloid aggregation disrupts physiological activity, increases thyroid carcinoma risk, and hampers its clinical use for bone-related diseases like osteoporosis and Paget's disease. Improving hCT with targeted modifications to mitigate amyloid formation while maintaining its function holds promise as a strategy. Understanding how each residue in hCT's amyloidogenic core affects its structure and aggregation dynamics is crucial for designing effective analogues. Mutants F16L-hCT and F19L-hCT, where Phe residues in the core are replaced with Leu as in nonamyloidogenic salmon calcitonin, showed different aggregation kinetics. However, the molecular effects of these substitutions in hCT are still unclear. Here, we systematically investigated the folding and self-assembly conformational dynamics of hCT, F16L-hCT, and F19L-hCT through multiple long-time scale independent atomistic discrete molecular dynamics (DMD) simulations. Our results indicated that the hCT monomer primarily assumed unstructured conformations with dynamic helices around residues 4-12 and 14-21. During self-assembly, the amyloidogenic core of hCT14-21 converted from dynamic helices to β-sheets. However, substituting F16L did not induce significant conformational changes, as F16L-hCT exhibited characteristics similar to those of wild-type hCT in both monomeric and oligomeric states. In contrast, F19L-hCT exhibited substantially more helices and fewer β-sheets than did hCT, irrespective of their monomers or oligomers. The substitution of F19L significantly enhanced the stability of the helical conformation for hCT14-21, thereby suppressing the helix-to-β-sheet conformational conversion. Overall, our findings elucidate the molecular mechanisms underlying hCT aggregation and the effects of F16L and F19L substitutions on the conformational dynamics of hCT, highlighting the critical role of F19 as an important target in the design of amyloid-resistant hCT analogs for future clinical applications.
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Affiliation(s)
- Fengjuan Huang
- Ningbo Institute of Innovation for Combined Medicine and Engineering, Lihuili Hospital Affiliated to Ningbo University, Ningbo University, Ningbo 315211, China
- School of Medicine, Ningbo University, Ningbo 315211, China
| | - Jiahui Huang
- School of Physical Science and Technology, Ningbo University, Ningbo 315211, China
| | - Jiajia Yan
- School of Physical Science and Technology, Ningbo University, Ningbo 315211, China
| | - Yuying Liu
- School of Physical Science and Technology, Ningbo University, Ningbo 315211, China
| | - Jiangfang Lian
- Ningbo Institute of Innovation for Combined Medicine and Engineering, Lihuili Hospital Affiliated to Ningbo University, Ningbo University, Ningbo 315211, China
| | - Qinxue Sun
- Ningbo Institute of Innovation for Combined Medicine and Engineering, Lihuili Hospital Affiliated to Ningbo University, Ningbo University, Ningbo 315211, China
| | - Feng Ding
- Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634, United States
| | - Yunxiang Sun
- School of Physical Science and Technology, Ningbo University, Ningbo 315211, China
- Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634, United States
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2
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Mazzini G, Le Foll C, Boyle CN, Garelja ML, Zhyvoloup A, Miller MET, Hay DL, Raleigh DP, Lutz TA. The processing intermediate of human amylin, pro-amylin(1-48), has in vivo and in vitro bioactivity. Biophys Chem 2024; 308:107201. [PMID: 38452520 DOI: 10.1016/j.bpc.2024.107201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Revised: 01/31/2024] [Accepted: 02/13/2024] [Indexed: 03/09/2024]
Abstract
Amylin is released by pancreatic beta-cells in response to a meal and its major soluble mature form (37 amino acid-peptide) produces its biological effects by activating amylin receptors. Amylin is derived from larger propeptides that are processed within the synthesizing beta-cell. There are suggestions that a partially processed form, pro-amylin(1-48) is also secreted. We tested the hypothesis that pro-amylin(1-48) has biological activity and that human pro-amylin(1-48) may also form toxic pre-amyloid species. Amyloid formation, the ability to cross-seed and in vitro toxicity were similar between human pro-amylin(1-48) and amylin. Human pro-amylin(1-48) was active at amylin-responsive receptors, though its potency was reduced at rat, but not human amylin receptors. Pro-amylin(1-48) was able to promote anorexia by activating neurons of the area postrema, amylin's primary site of action, indicating that amylin can tolerate significant additions at the N-terminus without losing bioactivity. Our studies help to shed light on the possible roles of pro-amylin(1-48) which may be relevant for the development of future amylin-based drugs.
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Affiliation(s)
- Giulia Mazzini
- Institute of Veterinary Physiology, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - Christelle Le Foll
- Institute of Veterinary Physiology, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - Christina N Boyle
- Institute of Veterinary Physiology, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - Michael L Garelja
- Department of Pharmacology and Toxicology, University of Otago, New Zealand
| | - Alexander Zhyvoloup
- Research Department of Structural and Molecular Biology, University College London, UK
| | | | - Debbie L Hay
- Department of Pharmacology and Toxicology, University of Otago, New Zealand.
| | - Daniel P Raleigh
- Research Department of Structural and Molecular Biology, University College London, UK; Department of Chemistry, Stony Brook University, USA; Laufer Center for Quantitative Biology Stony Brook University, USA.
| | - Thomas A Lutz
- Institute of Veterinary Physiology, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland.
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3
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Leibold NS, Despa F. Neuroinflammation induced by amyloid-forming pancreatic amylin: Rationale for a mechanistic hypothesis. Biophys Chem 2024; 310:107252. [PMID: 38663120 DOI: 10.1016/j.bpc.2024.107252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2023] [Revised: 04/18/2024] [Accepted: 04/21/2024] [Indexed: 05/15/2024]
Abstract
Amylin is a systemic neuroendocrine hormone co-expressed and co-secreted with insulin by pancreatic β-cells. In persons with thype-2 diabetes, amylin forms pancreatic amyloid triggering inflammasome and interleukin-1β signaling and inducing β-cell apoptosis. Here, we summarize recent progress in understanding the potential link between amyloid-forming pancreatic amylin and Alzheimer's disease (AD). Clinical data describing amylin pathology in AD alongside mechanistic studies in animals are reviewed. Data from multiple research teams indicate higher amylin concentrations are associated with increased frequency of cognitive impairment and amylin co-aggregates with β-amyloid in AD-type dementia. Evidence from rodent models further suggests cerebrovascular amylin accumulation as a causative factor underlying neurological deficits. Analysis of relevant literature suggests that modulating the amylin-interleukin-1β pathway may provide an approach for counteracting neuroinflammation in AD.
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Affiliation(s)
- Noah S Leibold
- Department of Pharmacology and Nutritional Sciences, College of Medicine, University of Kentucky, Lexington, KY 40536, USA
| | - Florin Despa
- Department of Pharmacology and Nutritional Sciences, College of Medicine, University of Kentucky, Lexington, KY 40536, USA.
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4
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Hoelzel C, Bai Y, Wang M, Liu Y, Zhang X. High-Fidelity Assay Based on Turn-Off Fluorescence to Detect the Perturbations of Cellular Proteostasis. ACS Bio Med Chem Au 2024; 4:111-118. [PMID: 38645930 PMCID: PMC11027126 DOI: 10.1021/acsbiomedchemau.3c00012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/05/2023] [Revised: 01/03/2024] [Accepted: 01/04/2024] [Indexed: 04/23/2024]
Abstract
The persistence of neurodegenerative diseases has necessitated the development of new strategies to monitor protein homeostasis (proteostasis). Previous efforts in our laboratory have focused on the development of fluorogenic strategies to observe the onset and progression of proteostatic stress. These works utilized solvatochromic and viscosity sensitive fluorophores to sense protein folded states, enabling stressor screening with an increase in the emission intensity upon aggregation. In this work, we present a novel, high-fidelity assay to detect perturbations of cellular proteostasis, where the fluorescence intensity decreases with the onset of proteostatic stress. Utilizing a fluorogenic, hydroxymethyl silicon-rhodamine probe to differentiate between protein folded states, we establish the validity of this technology in living cells by demonstrating a two-fold difference in fluorescence intensity between unstressed and stressed conditions.
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Affiliation(s)
- Conner Hoelzel
- Department
of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Yulong Bai
- Dalian
Institute of Chemical Physics, Chinese Academy
of Sciences, Dalian, Liaoning 116023, China
- Department
of Chemistry, School of Science and Research Center for Industries
of the Future, Westlake University, 600 Dunyu Road, Hangzhou 310030, Zhejiang
Province China
- Institute
of Natural Sciences, Westlake Institute for Advanced Study, Westlake
Laboratory of Life Sciences and Biomedicine, Westlake University, 18 Shilongshan Road, Hangzhou 310024, Zhejiang Province China
| | - Mengdie Wang
- Dalian
Institute of Chemical Physics, Chinese Academy
of Sciences, Dalian, Liaoning 116023, China
| | - Yu Liu
- Dalian
Institute of Chemical Physics, Chinese Academy
of Sciences, Dalian, Liaoning 116023, China
| | - Xin Zhang
- Department
of Chemistry, School of Science and Research Center for Industries
of the Future, Westlake University, 600 Dunyu Road, Hangzhou 310030, Zhejiang
Province China
- Institute
of Natural Sciences, Westlake Institute for Advanced Study, Westlake
Laboratory of Life Sciences and Biomedicine, Westlake University, 18 Shilongshan Road, Hangzhou 310024, Zhejiang Province China
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5
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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] [What about the content of this article? (0)] [Affiliation(s)] [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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Liu H, Cui Y, Zhao X, Wei L, Wang X, Shen N, Odom T, Li X, Lawless W, Karunarathne K, Muschol M, Guida W, Cao C, Ye L, Cai J. Helical sulfonyl-γ-AApeptides modulating Aβ oligomerization and cytotoxicity by recognizing Aβ helix. Proc Natl Acad Sci U S A 2024; 121:e2311733121. [PMID: 38285951 PMCID: PMC10861862 DOI: 10.1073/pnas.2311733121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Accepted: 12/10/2023] [Indexed: 01/31/2024] Open
Abstract
In contrast to prevalent strategies which make use of β-sheet mimetics to block Aβ fibrillar growth, in this study, we designed a series of sulfonyl-γ-AApeptide helices that targeted the crucial α-helix domain of Aβ13-26 and stabilized Aβ conformation to avoid forming the neurotoxic Aβ oligomeric β-sheets. Biophysical assays such as amyloid kinetics and TEM demonstrated that the Aβ oligomerization and fibrillation could be greatly prevented and even reversed in the presence of sulfonyl-γ-AApeptides in a sequence-specific and dose-dependent manner. The studies based on circular dichroism, Two-dimensional nuclear magnetic resonance spectroscopy (2D-NMR) spectra unambiguously suggested that the sulfonyl-γ-AApeptide Ab-6 could bind to the central region of Aβ42 and induce α-helix conformation in Aβ. Additionally, Electrospray ionisation-ion mobility spectrometry-mass spectrometry (ESI-IMS-MS) was employed to rule out a colloidal mechanism of inhibitor and clearly supported the capability of Ab-6 for inhibiting the formation of Aβ aggregated forms. Furthermore, Ab-6 could rescue neuroblastoma cells by eradicating Aβ-mediated cytotoxicity even in the presence of pre-formed Aβ aggregates. The confocal microscopy demonstrated that Ab-6 could still specifically bind Aβ42 and colocalize into mitochondria in the cellular environment, suggesting the rescue of cell viability might be due to the protection of mitochondrial function otherwise impaired by Aβ42 aggregation. Taken together, our studies indicated that sulfonyl-γ-AApeptides as helical peptidomimetics could direct Aβ into the off-pathway helical secondary structure, thereby preventing the formation of Aβ oligomerization, fibrillation and rescuing Aβ induced cell cytotoxicity.
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Affiliation(s)
- Heng Liu
- Department of Chemistry, University of South Florida, Tampa, FL33620
| | - Yunpeng Cui
- Department of Chemistry, University of South Florida, Tampa, FL33620
| | - Xue Zhao
- Department of Chemistry, University of South Florida, Tampa, FL33620
| | - Lulu Wei
- Department of Chemistry, University of South Florida, Tampa, FL33620
| | - Xudong Wang
- Department of Molecular Biosciences, University of South Florida, Tampa, FL33620
| | - Ning Shen
- Department of Chemistry, University of South Florida, Tampa, FL33620
| | - Timothy Odom
- Department of Chemistry, University of South Florida, Tampa, FL33620
| | - Xuming Li
- Department of Chemistry, University of South Florida, Tampa, FL33620
| | - William Lawless
- Department of Chemistry, University of South Florida, Tampa, FL33620
| | | | - Martin Muschol
- Department of Physics, University of South Florida, Tampa, FL33620
| | - Wayne Guida
- Department of Chemistry, University of South Florida, Tampa, FL33620
| | - Chuanhai Cao
- Taneja College of Pharmacy, University of South Florida, Tampa, FL33612
| | - Libin Ye
- Department of Molecular Biosciences, University of South Florida, Tampa, FL33620
| | - Jianfeng Cai
- Department of Chemistry, University of South Florida, Tampa, FL33620
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7
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Hsu C, Templin AT, Prosswimmer T, Shea D, Li J, Brooks‐Worrell B, Kahn SE, Daggett V. Human islet amyloid polypeptide-induced β-cell cytotoxicity is linked to formation of α-sheet structure. Protein Sci 2024; 33:e4854. [PMID: 38062941 PMCID: PMC10823758 DOI: 10.1002/pro.4854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Revised: 11/10/2023] [Accepted: 12/04/2023] [Indexed: 01/30/2024]
Abstract
Type 2 diabetes (T2D) results from insulin secretory dysfunction arising in part from the loss of pancreatic islet β-cells. Several factors contribute to β-cell loss, including islet amyloid formation, which is observed in over 90% of individuals with T2D. The amyloid is comprised of human islet amyloid polypeptide (hIAPP). Here we provide evidence that early in aggregation, hIAPP forms toxic oligomers prior to formation of amyloid fibrils. The toxic oligomers contain α-sheet secondary structure, a nonstandard secondary structure associated with toxic oligomers in other amyloid diseases. De novo, synthetic α-sheet compounds designed to be nontoxic and complementary to the α-sheet structure in the toxic oligomers inhibit hIAPP aggregation and neutralize oligomer-mediated cytotoxicity in cell-based assays. In vivo administration of an α-sheet design to mice for 4 weeks revealed no evidence of toxicity nor did it elicit an immune response. Furthermore, the α-sheet designs reduced endogenous islet amyloid formation and mitigation of amyloid-associated β-cell loss in cultured islets isolated from an hIAPP transgenic mouse model of islet amyloidosis. Characterization of the involvement of α-sheet in early aggregation of hIAPP and oligomer toxicity contributes to elucidation of the molecular mechanisms underlying amyloid-associated β-cell loss.
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Affiliation(s)
- Cheng‐Chieh Hsu
- Department of BioengineeringUniversity of WashingtonSeattleWashingtonUSA
- Molecular Engineering ProgramUniversity of WashingtonSeattleWashingtonUSA
| | - Andrew T. Templin
- Division of Metabolism, Endocrinology and Nutrition, Department of MedicineVA Puget Sound Health Care System and University of WashingtonSeattleWashingtonUSA
| | - Tatum Prosswimmer
- Molecular Engineering ProgramUniversity of WashingtonSeattleWashingtonUSA
| | - Dylan Shea
- Molecular Engineering ProgramUniversity of WashingtonSeattleWashingtonUSA
| | - Jinzheng Li
- Department of BiochemistryUniversity of WashingtonSeattleWashingtonUSA
| | - Barbara Brooks‐Worrell
- Division of Metabolism, Endocrinology and Nutrition, Department of MedicineVA Puget Sound Health Care System and University of WashingtonSeattleWashingtonUSA
| | - Steven E. Kahn
- Division of Metabolism, Endocrinology and Nutrition, Department of MedicineVA Puget Sound Health Care System and University of WashingtonSeattleWashingtonUSA
| | - Valerie Daggett
- Department of BioengineeringUniversity of WashingtonSeattleWashingtonUSA
- Molecular Engineering ProgramUniversity of WashingtonSeattleWashingtonUSA
- Department of BiochemistryUniversity of WashingtonSeattleWashingtonUSA
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8
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Suginoma H, Owada R, Katano-Toki A, Mori A, Fujioka J, Nakamura K. Non-fibril form but not fibril form of human islet amyloid polypeptide 8-20 changes brain functions in mice. PLoS One 2024; 19:e0296750. [PMID: 38181010 PMCID: PMC10769099 DOI: 10.1371/journal.pone.0296750] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Accepted: 12/19/2023] [Indexed: 01/07/2024] Open
Abstract
Whether fibril formation increases or decreases cytotoxicity remains unclear. Aggregation of human islet amyloid polypeptide (hIAPP), a pivotal regulator of glucose homeostasis, impairs the function and viability of pancreatic β cells. Evidence suggests that low-order oligomers of hIAPP are more toxic to β cells than fibril. However, it remains unclear whether non-fibril form of hIAPP specifically alters brain functions. This study produced fibril and non-fibril forms from a single hIAPP 8-20 peptide. The non-fibril form-injected mice showed changes in spontaneous motor activities, preference for location in the open field and social behavior. In contrast, the fibril-injected mice showed no changes in these behavioral tests. In line with the behavioral changes, the non-fibril form led to impaired neurite outgrowth of cultured neuron-like cells and the loss of neurons in the mouse hippocampus. These findings suggest that non-fibril form but not fibril form of hIAPP changes brain functions.
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Affiliation(s)
- Hinaho Suginoma
- Department of Laboratory Sciences, Gunma University Graduate School of Health Sciences, Maebashi, Gunma, Japan
| | - Ryuji Owada
- Department of Laboratory Sciences, Gunma University Graduate School of Health Sciences, Maebashi, Gunma, Japan
| | - Akiko Katano-Toki
- Department of Laboratory Sciences, Gunma University Graduate School of Health Sciences, Maebashi, Gunma, Japan
| | - Ayaka Mori
- Department of Laboratory Sciences, Gunma University Graduate School of Health Sciences, Maebashi, Gunma, Japan
| | - Jun Fujioka
- Department of Chemistry, Faculty of Science Division I, Tokyo University of Science, Shinjuku-ku, Tokyo, Japan
| | - Kazuhiro Nakamura
- Department of Laboratory Sciences, Gunma University Graduate School of Health Sciences, Maebashi, Gunma, Japan
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9
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Hunt NT. Biomolecular infrared spectroscopy: making time for dynamics. Chem Sci 2024; 15:414-430. [PMID: 38179520 PMCID: PMC10763549 DOI: 10.1039/d3sc05223k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Accepted: 11/24/2023] [Indexed: 01/06/2024] Open
Abstract
Time resolved infrared spectroscopy of biological molecules has provided a wealth of information relating to structural dynamics, conformational changes, solvation and intermolecular interactions. Challenges still exist however arising from the wide range of timescales over which biological processes occur, stretching from picoseconds to minutes or hours. Experimental methods are often limited by vibrational lifetimes of probe groups, which are typically on the order of picoseconds, while measuring an evolving system continuously over some 18 orders of magnitude in time presents a raft of technological hurdles. In this Perspective, a series of recent advances which allow biological molecules and processes to be studied over an increasing range of timescales, while maintaining ultrafast time resolution, will be reviewed, showing that the potential for real-time observation of biomolecular function draws ever closer, while offering a new set of challenges to be overcome.
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Affiliation(s)
- Neil T Hunt
- Department of Chemistry and York Biomedical Research Institute, University of York Heslington York YO10 5DD UK
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10
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Tsai HC, Huang CH, Tu LH. TPE conjugated islet amyloid polypeptide probe for detection of peptide oligomers. Biophys Chem 2024; 304:107129. [PMID: 37948788 DOI: 10.1016/j.bpc.2023.107129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Revised: 10/26/2023] [Accepted: 10/28/2023] [Indexed: 11/12/2023]
Abstract
Islet amyloid polypeptide (IAPP), also known as amylin, is a polypeptide hormone co-secreted with insulin by pancreatic β-cells. In general, IAPP is soluble and lacks a defined structure. However, under certain conditions, these peptides tend to aggregate into soluble oligomers, eventually forming insoluble amyloid fibrils with typical cross-β-sheet structures. Amylin aggregates, therefore, have been regarded as one of the hallmarks of type II diabetes (T2D). Among these aggregated species, oligomers were shown to exhibit significant cytotoxicity, leading to impaired β-cell function and reduced β-cell mass. Monitoring of oligomer appearance during IAPP fibrillation is of particular interest. In this study, we successfully grafted an aggregation-induced emission molecule, tetraphenylethylene (TPE), at the N-terminus of IAPP. By mixing a small amount of TPE-labeled IAPP with unlabeled IAPP, we were able to detect an increase in TPE fluorescence during the nucleation phase of IAPP aggregation in vitro. It may enable real-time monitoring of IAPP oligomer formation and is further applied in the diagnosis of T2D.
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Affiliation(s)
- Hsiao-Chieh Tsai
- Department of Chemistry, National Taiwan Normal University, Taipei 11677, Taiwan
| | - Ching-Hong Huang
- Department of Chemistry, National Taiwan Normal University, Taipei 11677, Taiwan
| | - Ling-Hsien Tu
- Department of Chemistry, National Taiwan Normal University, Taipei 11677, Taiwan.
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11
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Meleleo D, Cibelli G, Valenzano A, Mastrodonato M, Mallamaci R. The Effect of Calcium Ions on hIAPP Channel Activity: Possible Implications in T2DM. Membranes (Basel) 2023; 13:878. [PMID: 37999364 PMCID: PMC10673357 DOI: 10.3390/membranes13110878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Revised: 11/07/2023] [Accepted: 11/07/2023] [Indexed: 11/25/2023]
Abstract
The calcium ion (Ca2+) has been linked to type 2 diabetes mellitus (T2DM), although the role of Ca2+ in this disorder is the subject of intense investigation. Serum Ca2+ dyshomeostasis is associated with the development of insulin resistance, reduced insulin sensitivity, and impaired glucose tolerance. However, the molecular mechanisms involving Ca2+ ions in pancreatic β-cell loss and subsequently in T2DM remain poorly understood. Implicated in the decline in β-cell functions are aggregates of human islet amyloid polypeptide (hIAPP), a small peptide secreted by β-cells that shows a strong tendency to self-aggregate into β-sheet-rich aggregates that evolve toward the formation of amyloid deposits and mature fibrils. The soluble oligomers of hIAPP can permeabilize the cell membrane by interacting with bilayer lipids. Our study aimed to evaluate the effect of Ca2+ on the ability of the peptide to incorporate and form ion channels in zwitterionic planar lipid membranes (PLMs) composed of palmitoyl-oleoyl-phosphatidylcholine (POPC) and on the aggregation process of hIAPP molecules in solution. Our results may help to clarify the link between Ca2+ ions, hIAPP peptide, and consequently the pathophysiology of T2DM.
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Affiliation(s)
- Daniela Meleleo
- Department of Science of Agriculture, Food, Natural Resources and Engineering, University of Foggia, 71122 Foggia, Italy
| | - Giuseppe Cibelli
- Department of Clinical and Experimental Medicine, University of Foggia, 71122 Foggia, Italy; (G.C.); (A.V.)
| | - Anna Valenzano
- Department of Clinical and Experimental Medicine, University of Foggia, 71122 Foggia, Italy; (G.C.); (A.V.)
| | - Maria Mastrodonato
- Department of Biosciences, Biotechnologies and Environment, University of Bari “Aldo Moro”, 70125 Bari, Italy; (M.M.); (R.M.)
| | - Rosanna Mallamaci
- Department of Biosciences, Biotechnologies and Environment, University of Bari “Aldo Moro”, 70125 Bari, Italy; (M.M.); (R.M.)
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12
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Wirth F, Heitz FD, Seeger C, Combaluzier I, Breu K, Denroche HC, Thevenet J, Osto M, Arosio P, Kerr-Conte J, Verchere CB, Pattou F, Lutz TA, Donath MY, Hock C, Nitsch RM, Grimm J. A human antibody against pathologic IAPP aggregates protects beta cells in type 2 diabetes models. Nat Commun 2023; 14:6294. [PMID: 37813862 PMCID: PMC10562398 DOI: 10.1038/s41467-023-41986-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Accepted: 09/26/2023] [Indexed: 10/11/2023] Open
Abstract
In patients with type 2 diabetes, pancreatic beta cells progressively degenerate and gradually lose their ability to produce insulin and regulate blood glucose. Beta cell dysfunction and loss is associated with an accumulation of aggregated forms of islet amyloid polypeptide (IAPP) consisting of soluble prefibrillar IAPP oligomers as well as insoluble IAPP fibrils in pancreatic islets. Here, we describe a human monoclonal antibody selectively targeting IAPP oligomers and neutralizing IAPP aggregate toxicity by preventing membrane disruption and apoptosis in vitro. Antibody treatment in male rats and mice transgenic for human IAPP, and human islet-engrafted mouse models of type 2 diabetes triggers clearance of IAPP oligomers resulting in beta cell protection and improved glucose control. These results provide new evidence for the pathological role of IAPP oligomers and suggest that antibody-mediated removal of IAPP oligomers could be a pharmaceutical strategy to support beta cell function in type 2 diabetes.
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Affiliation(s)
- Fabian Wirth
- Neurimmune AG, Wagistrasse 18, 8952, Schlieren, Switzerland
| | | | | | | | - Karin Breu
- Neurimmune AG, Wagistrasse 18, 8952, Schlieren, Switzerland
| | - Heather C Denroche
- BC Children's Hospital Research Institute and Centre for Molecular Medicine and Therapeutics, Departments of Surgery and Pathology & Laboratory Medicine, University of British Columbia, A4-151 950 W 28 Ave, Vancouver, BC, Canada
| | - Julien Thevenet
- Univ-Lille, Inserm, CHU Lille, U1190 - EGID, F-59000, Lille, France
| | - Melania Osto
- Institute of Veterinary Physiology, Vetsuisse Faculty of the University of Zürich, Winterthurerstrasse 260, 8057, Zürich, Switzerland
| | - Paolo Arosio
- Institute for Chemical and Bioengineering, ETH Zürich, Vladimir-Prelog-Weg 1-5/10, 8093, Zürich, Switzerland
| | - Julie Kerr-Conte
- Univ-Lille, Inserm, CHU Lille, U1190 - EGID, F-59000, Lille, France
| | - C Bruce Verchere
- BC Children's Hospital Research Institute and Centre for Molecular Medicine and Therapeutics, Departments of Surgery and Pathology & Laboratory Medicine, University of British Columbia, A4-151 950 W 28 Ave, Vancouver, BC, Canada
| | - François Pattou
- Univ-Lille, Inserm, CHU Lille, U1190 - EGID, F-59000, Lille, France
| | - Thomas A Lutz
- Institute of Veterinary Physiology, Vetsuisse Faculty of the University of Zürich, Winterthurerstrasse 260, 8057, Zürich, Switzerland
| | - Marc Y Donath
- Clinic for Endocrinology, Diabetes & Metabolism, and Department of Biomedicine, University Hospital Basel, Hebelstrasse 20, 4031, Basel, Switzerland
| | - Christoph Hock
- Neurimmune AG, Wagistrasse 18, 8952, Schlieren, Switzerland
- Institute for Regenerative Medicine-IREM, University of Zürich, Wagistrasse 12, 8952, Schlieren, Switzerland
| | - Roger M Nitsch
- Neurimmune AG, Wagistrasse 18, 8952, Schlieren, Switzerland
- Institute for Regenerative Medicine-IREM, University of Zürich, Wagistrasse 12, 8952, Schlieren, Switzerland
| | - Jan Grimm
- Neurimmune AG, Wagistrasse 18, 8952, Schlieren, Switzerland.
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13
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Chan AC, Shan PY, Wu MH, Lin PH, Tsai CS, Hsu CC, Chiu TH, Hsu TW, Yeh YC, Lai YJ, Liu WM, Tu LH. Piperic acid derivative as a molecular modulator to accelerate the IAPP aggregation process and alter its antimicrobial activity. Chem Commun (Camb) 2023; 59:10660-10663. [PMID: 37581279 DOI: 10.1039/d3cc03363e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/16/2023]
Abstract
Piperic acid derivatives were found to affect the islet amyloid polypeptide (IAPP) aggregation process. Structure-activity relationship studies revealed that PAD-13 was an efficient molecular modulator to accelerate IAPP fibril formation by promoting primary and secondary nucleation and reducing its antimicrobial activity.
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Affiliation(s)
- Ai-Ci Chan
- Department of Chemistry, National Taiwan Normal University, Taipei 116, Taiwan.
| | - Pei-Ya Shan
- Department of Chemistry, National Taiwan Normal University, Taipei 116, Taiwan.
| | - Men-Hsin Wu
- Department of Chemistry, National Taiwan Normal University, Taipei 116, Taiwan.
| | - Pin-Han Lin
- Department of Chemistry, Fu Jen Catholic University, New Taipei City 242, Taiwan.
| | - Chang-Shun Tsai
- Department of Chemistry, National Taiwan Normal University, Taipei 116, Taiwan.
| | - Chia-Chien Hsu
- Department of Chemistry, National Taiwan Normal University, Taipei 116, Taiwan.
| | - Ting-Hsiang Chiu
- Institute of Polymer Science and Engineering, National Taiwan University, Taipei, 106, Taiwan
| | - Ting-Wei Hsu
- Department of Life Science, National Taiwan Normal University, Taipei 116, Taiwan.
| | - Yi-Cheun Yeh
- Institute of Polymer Science and Engineering, National Taiwan University, Taipei, 106, Taiwan
| | - Yun-Ju Lai
- Department of Life Science, National Taiwan Normal University, Taipei 116, Taiwan.
| | - Wei-Min Liu
- Department of Chemistry, Fu Jen Catholic University, New Taipei City 242, Taiwan.
| | - Ling-Hsien Tu
- Department of Chemistry, National Taiwan Normal University, Taipei 116, Taiwan.
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14
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Li MH, Zhang X, London E, Raleigh DP. Impact of Ca 2+ on membrane catalyzed IAPP amyloid formation and IAPP induced vesicle leakage. Biochim Biophys Acta Biomembr 2023; 1865:184161. [PMID: 37121365 PMCID: PMC10735052 DOI: 10.1016/j.bbamem.2023.184161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Revised: 04/10/2023] [Accepted: 04/24/2023] [Indexed: 05/02/2023]
Abstract
Human islet amyloid polypeptide (hIAPP, also known as amylin) is a 37 amino acid pancreatic polypeptide hormone that plays a role in regulating glucose levels, but forms pancreatic amyloid in type-2 diabetes. The process of amyloid formation by hIAPP contributes to β-cell death in the disease. Multiple mechanisms of hIAPP induced toxicity of β-cells have been proposed including disruption of cellular membranes. However, the nature of hIAPP membrane interactions and the effect of ions and other molecules on hIAPP membrane interactions are not fully understood. Many studies have used model membranes with a high content of anionic lipids, often POPS, however the concentration of anionic lipids in the β-cell plasma membrane is low. Here we study the concentration dependent effect of Ca2+ (0 to 50 mM) on hIAPP membrane interactions using large unilamellar vesicles (LUVs) with anionic lipid content ranging from 0 to 50 mol%. We find that Ca2+ does not effectively inhibit hIAPP amyloid formation and hIAPP induced membrane leakage from binary LUVs with a low percentage of POPS, but has a greater effect on LUVs with a high percentage of POPS. Mg2+ had very similar effects, and the effects of Ca2+ and Mg2+ can be largely rationalized by the neutralization of POPS charge. The implications for hIAPP-membrane interactions are discussed.
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Affiliation(s)
- Ming-Hao Li
- Graduate Program in Biochemistry and Structural Biology, Stony Brook University, Stony Brook, NY 11794, United States
| | - Xiaoxue Zhang
- Department of Chemistry, Stony Brook University, Stony Brook, NY 11794, United States
| | - Erwin London
- Graduate Program in Biochemistry and Structural Biology, Stony Brook University, Stony Brook, NY 11794, United States; Department of Chemistry, Stony Brook University, Stony Brook, NY 11794, United States; Department of Biochemistry and Cell Biology, Stony Brook University, Stony Brook, NY 11794, United States.
| | - Daniel P Raleigh
- Graduate Program in Biochemistry and Structural Biology, Stony Brook University, Stony Brook, NY 11794, United States; Department of Chemistry, Stony Brook University, Stony Brook, NY 11794, United States; Laufer Center for Physical and Quantitative Biology, Stony Brook University, Stony Brook, NY 11794, United States.
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15
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Sanders HM, Chalyavi F, Fields CR, Kostelic MM, Li MH, Raleigh DP, Zanni MT, Marty MT. Interspecies Variation Affects Islet Amyloid Polypeptide Membrane Binding. J Am Soc Mass Spectrom 2023. [PMID: 37126782 DOI: 10.1021/jasms.3c00005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
The aggregation of islet amyloid polypeptide (IAPP) is associated with β-cell dysfunction in type 2 diabetes (T2D) in humans. One possible mechanism of toxicity is the interaction of IAPP oligomers with lipid membranes to disrupt the bilayer integrity and/or homeostasis of the cell. Amino acid sequence variations of IAPPs between species can greatly decrease their propensity for aggregation. For example, human IAPP is toxic to β-cells, but rat and pig IAPP are not. However, it is not clear how these differences affect membrane association. Using native mass spectrometry with lipid nanodiscs, we explored the differences in the association of human, rat, and pig IAPP with lipid bilayers. We discovered that human and rat IAPP bound nanodiscs with anionic dipalmitoyl-phosphatidylglycerol (DPPG) lipids, but pig IAPP did not. Furthermore, human and rat IAPP interacted differently with the membrane. Human IAPP show potential tetramer complexes, but rat IAPP associated with the membrane sequentially. Thus, overall IAPP-bilayer interactions are not necessarily related to disease, but small differences in oligomeric behavior at the membrane may instead play a role.
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Affiliation(s)
- Henry M Sanders
- Department of Chemistry and Biochemistry and Bio5 Institute, University of Arizona, Tucson, Arizona 85721, United States
| | - Farzaneh Chalyavi
- Department of Chemistry, University of Wisconsin─Madison, Madison, Wisconsin 53706, United States
| | - Caitlyn R Fields
- Department of Chemistry, University of Wisconsin─Madison, Madison, Wisconsin 53706, United States
| | - Marius M Kostelic
- Department of Chemistry and Biochemistry and Bio5 Institute, University of Arizona, Tucson, Arizona 85721, United States
| | - Ming-Hao Li
- Department of Chemistry and Laufer Center for Quantitative Biology, Stony Brook University, 100 Nicolls Rd., Stony Brook, New York 11794, United States
| | - Daniel P Raleigh
- Department of Chemistry and Laufer Center for Quantitative Biology, Stony Brook University, 100 Nicolls Rd., Stony Brook, New York 11794, United States
| | - Martin T Zanni
- Department of Chemistry, University of Wisconsin─Madison, Madison, Wisconsin 53706, United States
| | - Michael T Marty
- Department of Chemistry and Biochemistry and Bio5 Institute, University of Arizona, Tucson, Arizona 85721, United States
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16
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Lin PH, Tsai CS, Hsu CC, Lee IR, Shen YX, Fan HF, Chen YW, Tu LH, Liu WM. An environmentally sensitive molecular rotor as a NIR fluorescent probe for the detection of islet amyloid polypeptide. Talanta 2023; 254:124130. [PMID: 36462286 DOI: 10.1016/j.talanta.2022.124130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Revised: 11/17/2022] [Accepted: 11/22/2022] [Indexed: 11/25/2022]
Abstract
The deposits of human islet amyloid polypeptide (IAPP), also called amylin, in the pancreas have been postulated to be a factor of pancreatic β-cell dysfunction and is one of the common pathological hallmarks of type II diabetes mellitus (T2DM). Therefore, it is imperative to gain an in-depth understanding of the formation of these aggregates. In this study, we demonstrate a rationally-designed strategy of an environmentally sensitive near-infrared (NIR) molecular rotor utilizing thioflavin T (ThT) as a scaffold for IAPP deposits. We extended the π delocalized system not only to improve the viscosity sensitivity but also to prolong the emission wavelength to the NIR region. A naphthalene moiety was also introduced to adjust the sensitivity of our designed probes to differentiate the binding microenvironment polarity of different targeted proteins. As a result, a novel NIR fluorogenic probe toward IAPP aggregates, namely AmySP-4-Nap-Ene, was first developed. When attached to different protein aggregates, this probe exhibited distinct fluorescence emission profiles. In a comparison with ThT, the fluorescence emission of non-ionic AmySP-4-Nap-Ene exhibits a significant difference between the presence of non-fibrillar and fibrillar IAPP and displays a higher binding affinity toward IAPP fibrils. Further, the AmySP-4-Nap-Ene can be utilized to monitor IAPP accumulating process and image fibrils both in vitro and in living cells.
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Affiliation(s)
- Pin-Han Lin
- Department of Chemistry, Fu Jen Catholic University, New Taipei City, 24205, Taiwan, ROC
| | - Chang-Shun Tsai
- Department of Chemistry, National Taiwan Normal University, Taipei, 11677, Taiwan, ROC
| | - Chia-Chien Hsu
- Department of Chemistry, National Taiwan Normal University, Taipei, 11677, Taiwan, ROC
| | - I-Ren Lee
- Department of Chemistry, National Taiwan Normal University, Taipei, 11677, Taiwan, ROC; Genomics Research Center, Academia Sinica, Taipei, 11529, Taiwan, ROC
| | - Yu-Xin Shen
- Institute of Medical Science and Technology, National Sun Yat-sen University, Kaohsiung, 804201, Taiwan, ROC
| | - Hsiu-Fang Fan
- Institute of Medical Science and Technology, National Sun Yat-sen University, Kaohsiung, 804201, Taiwan, ROC
| | - Yun-Wen Chen
- Department of Pharmacology, College of Medicine, National Cheng Kung University, Tainan, 70101, Taiwan, ROC.
| | - Ling-Hsien Tu
- Department of Chemistry, National Taiwan Normal University, Taipei, 11677, Taiwan, ROC.
| | - Wei-Min Liu
- Department of Chemistry, Fu Jen Catholic University, New Taipei City, 24205, Taiwan, ROC.
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17
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Sebastiao M, Babych M, Quittot N, Kumar K, Arnold AA, Marcotte I, Bourgault S. Development of a novel fluorescence assay for studying lipid bilayer perturbation induced by amyloidogenic peptides using cell plasma membrane vesicles. Biochim Biophys Acta Biomembr 2023; 1865:184118. [PMID: 36621762 DOI: 10.1016/j.bbamem.2022.184118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Revised: 11/22/2022] [Accepted: 12/27/2022] [Indexed: 01/07/2023]
Abstract
Numerous pathophysiological conditions are associated with the misfolding and aggregation of proteins into insoluble amyloid fibrils. The mechanisms by which this process leads to cellular dysfunction remain elusive, though several hypotheses point toward the perturbation of the cell plasma membrane by pre-fibrillar intermediates and/or amyloid growth. However, current models to study membrane perturbations are largely limited to synthetic lipid vesicles and most of experimental approaches cannot be transposed to complex cell-derived plasma membrane systems. Herein, vesicles originating from the plasma membrane of erythrocytes and β-pancreatic cells were used to study the perturbations induced by an amyloidogenic peptide, the islet amyloid polypeptide (IAPP). These biologically relevant lipid vesicles displayed a characteristic clustering in the presence of the amyloidogenic peptide, which was able to rupture membranes. By exploiting Förster resonance energy transfer (FRET), a rapid, simple, and potentially high-throughput assay to detect membrane perturbations of intact mammalian cell plasma membrane vesicles was implemented. The FRET kinetics of membrane perturbations closely correlated with the kinetics of thioflavin-T fluorescence associated with amyloid formation. This novel kinetics assay expands the toolbox available to study amyloid-associated membrane damage, bridging the gap between synthetic lipid vesicles and living cells.
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Affiliation(s)
- Mathew Sebastiao
- Department of Chemistry, Université du Québec à Montréal, Montreal, QC, Canada; Quebec Network for Research on Protein Function, Engineering, and Applications, PROTEO, Quebec, QC, Canada
| | - Margaryta Babych
- Department of Chemistry, Université du Québec à Montréal, Montreal, QC, Canada; Quebec Network for Research on Protein Function, Engineering, and Applications, PROTEO, Quebec, QC, Canada
| | - Noé Quittot
- Department of Chemistry, Université du Québec à Montréal, Montreal, QC, Canada; Quebec Network for Research on Protein Function, Engineering, and Applications, PROTEO, Quebec, QC, Canada
| | - Kiran Kumar
- Department of Chemistry, Université du Québec à Montréal, Montreal, QC, Canada; Quebec Network for Research on Protein Function, Engineering, and Applications, PROTEO, Quebec, QC, Canada
| | - Alexandre A Arnold
- Department of Chemistry, Université du Québec à Montréal, Montreal, QC, Canada; Quebec Network for Research on Protein Function, Engineering, and Applications, PROTEO, Quebec, QC, Canada
| | - Isabelle Marcotte
- Department of Chemistry, Université du Québec à Montréal, Montreal, QC, Canada; Quebec Network for Research on Protein Function, Engineering, and Applications, PROTEO, Quebec, QC, Canada.
| | - Steve Bourgault
- Department of Chemistry, Université du Québec à Montréal, Montreal, QC, Canada; Quebec Network for Research on Protein Function, Engineering, and Applications, PROTEO, Quebec, QC, Canada.
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18
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Muschol M, Hoyer W. Amyloid oligomers as on-pathway precursors or off-pathway competitors of fibrils. Front Mol Biosci 2023; 10:1120416. [PMID: 36845541 PMCID: PMC9947291 DOI: 10.3389/fmolb.2023.1120416] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Accepted: 01/27/2023] [Indexed: 02/11/2023] Open
Abstract
Amyloid Diseases involve the growth of disease specific proteins into amyloid fibrils and their deposition in protein plaques. Amyloid fibril formation is typically preceded by oligomeric intermediates. Despite significant efforts, the specific role fibrils or oligomers play in the etiology of any given amyloid disease remains controversial. In neurodegenerative disease, though, amyloid oligomers are widely considered critical contributors to disease symptoms. Aside from oligomers as inevitable on-pathway precursors of fibril formation, there is significant evidence for off-pathway oligomer formation competing with fibril growth. The distinct mechanisms and pathways of oligomer formation directly affect our understanding under which conditions oligomers emerge in vivo, and whether their formation is directly coupled to, or distinct from, amyloid fibril formation. In this review, we will discuss the basic energy landscapes underlying the formation of on-pathway vs. off-pathway oligomers, their relation to the related amyloid aggregation kinetics, and their resulting implications for disease etiology. We will review evidence on how differences in the local environment of amyloid assembly can dramatically shift the relative preponderance of oligomers vs. fibrils. Finally, we will comment on gaps in our knowledge of oligomer assembly, of their structure, and on how to assess their relevance to disease etiology.
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Affiliation(s)
- Martin Muschol
- Department of Physics, University of South Florida, Tampa, FL, United States,*Correspondence: Martin Muschol, ; Wolfgang Hoyer,
| | - Wolfgang Hoyer
- Institut für Physikalische Biologie, Heinrich-Heine-Universität, Düsseldorf, Germany,Institute of Biological Information Processing (IBI-7) and JuStruct, Jülich Center for Structural Biology, Forschungszentrum Jülich, Jülich, Germany,*Correspondence: Martin Muschol, ; Wolfgang Hoyer,
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19
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Elenbaas BO, Kremsreiter SM, Khemtemourian L, Killian JA, Sinnige T. Fibril elongation by human islet amyloid polypeptide is the main event linking aggregation to membrane damage. BBA Advances 2023; 3:100083. [PMID: 37082256 PMCID: PMC10074975 DOI: 10.1016/j.bbadva.2023.100083] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023] Open
Abstract
The aggregation of human islet amyloid polypeptide (hIAPP) is linked to the death of pancreatic β-cells in type II diabetes. The process of fibril formation by hIAPP is thought to cause membrane damage, but the precise mechanisms are still unclear. Previously, we showed that the aggregation of hIAPP in the presence of membranes containing anionic lipids is dominated by secondary nucleation events, which occur at the interface between existing fibrils and the membrane surface. Here, we used vesicles with different lipid composition to explore the connection between hIAPP aggregation and vesicle leakage. We found that different anionic lipids promote hIAPP aggregation to the same extent, whereas remarkably stochastic behaviour is observed on purely zwitterionic membranes. Vesicle leakage induced by hIAPP consists of two distinct phases for any of the used membrane compositions: (i) an initial phase in which hIAPP binding causes a certain level of leakage that is strongly dependent on osmotic conditions, membrane composition and the used dye, and (ii) a main leakage event that we attribute to elongation of hIAPP fibrils, based on seeded experiments. Altogether, our results shed more light on the relationship between hIAPP fibril formation and membrane damage, and strongly suggest that oligomeric intermediates do not considerably contribute to vesicle leakage.
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Affiliation(s)
- Barend O.W. Elenbaas
- Membrane Biochemistry and Biophysics, Bijvoet Centre for Biomolecular Research, Utrecht University, Padualaan 8, 3584 CH, Utrecht, the Netherlands
| | - Stefanie M. Kremsreiter
- Membrane Biochemistry and Biophysics, Bijvoet Centre for Biomolecular Research, Utrecht University, Padualaan 8, 3584 CH, Utrecht, the Netherlands
| | - Lucie Khemtemourian
- Institute of Chemistry & Biology of Membranes & Nanoobjects (CBMN), CNRS UMR5248, University of Bordeaux, Bordeaux INP, allée Geoffroy St-Hilaire, 33600, Pessac, France
| | - J. Antoinette Killian
- Membrane Biochemistry and Biophysics, Bijvoet Centre for Biomolecular Research, Utrecht University, Padualaan 8, 3584 CH, Utrecht, the Netherlands
| | - Tessa Sinnige
- Membrane Biochemistry and Biophysics, Bijvoet Centre for Biomolecular Research, Utrecht University, Padualaan 8, 3584 CH, Utrecht, the Netherlands
- Corresponding author.
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20
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Manathunga L, Akter R, Zhyvoloup A, Simmerling C, Raleigh DP. On the plasticity of amyloid formation: The impact of destabilizing small to large substitutions on islet amyloid polypeptide amyloid formation. Protein Sci 2023; 32:e4539. [PMID: 36484106 PMCID: PMC9847078 DOI: 10.1002/pro.4539] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Revised: 11/19/2022] [Accepted: 12/03/2022] [Indexed: 12/14/2022]
Abstract
Amyloids are partially ordered, proteinaceous, β-sheet rich deposits that have been implicated in a wide range of diseases. An even larger set of proteins that do not normally form amyloid in vivo can be induced to do so in vitro. A growing number of structures of amyloid fibrils have been reported and a common feature is the presence of a tightly packed core region in which adjacent monomers pack together in extremely tight interfaces, often referred to as steric zippers. A second common feature of many amyloid fibrils is their polymorphous nature. We examine the consequences of disrupting the tight packing in amyloid fibrils on the kinetics of their formation using the 37 residue polypeptide hormone islet amyloid polypeptide (IAPP, amylin) as a model system. IAPP forms islet amyloid in vivo and is aggressively amyloidogenic in vitro. Six Cryo-EM structures of IAPP amyloid fibrils are available and in all Gly24 is in the core of the structured region and makes tight contacts with other residues. Calculations using the ff14SBonlysc forcefield in Amber20 show that substitutions with larger amino acids significantly disrupt close packing and are predicted to destabilize the various fibril structures. However, Gly to 2-amino butyric acid (2-carbon side chain) and Gly to Leu substitutions actually enhance the rate of amyloid formation. A Pro substitution slows, but does not prevent amyloid formation.
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Affiliation(s)
- Lakshan Manathunga
- Department of ChemistryStony Brook UniversityStony BrookNew YorkUSA
- Laufer Center for Physical and Quantitative Biology, Stony Brook UniversityStony BrookNew YorkUSA
| | - Rehana Akter
- Department of ChemistryStony Brook UniversityStony BrookNew YorkUSA
| | - Alexander Zhyvoloup
- Research Department of Structural and Molecular BiologyUniversity College LondonLondonUK
| | - Carlos Simmerling
- Department of ChemistryStony Brook UniversityStony BrookNew YorkUSA
- Laufer Center for Physical and Quantitative Biology, Stony Brook UniversityStony BrookNew YorkUSA
| | - Daniel P. Raleigh
- Department of ChemistryStony Brook UniversityStony BrookNew YorkUSA
- Laufer Center for Physical and Quantitative Biology, Stony Brook UniversityStony BrookNew YorkUSA
- Research Department of Structural and Molecular BiologyUniversity College LondonLondonUK
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21
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Taylor AJ, Panzhinskiy E, Orban PC, Lynn FC, Schaeffer DF, Johnson JD, Kopp JL, Verchere CB. Islet amyloid polypeptide does not suppress pancreatic cancer. Mol Metab 2023; 68:101667. [PMID: 36621763 PMCID: PMC9938314 DOI: 10.1016/j.molmet.2023.101667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Revised: 12/24/2022] [Accepted: 01/02/2023] [Indexed: 01/06/2023] Open
Abstract
OBJECTIVES Pancreatic cancer risk is elevated approximately two-fold in type 1 and type 2 diabetes. Islet amyloid polypeptide (IAPP) is an abundant beta-cell peptide hormone that declines with diabetes progression. IAPP has been reported to act as a tumour-suppressor in p53-deficient cancers capable of regressing tumour volumes. Given the decline of IAPP during diabetes development, we investigated the actions of IAPP in pancreatic ductal adenocarcinoma (PDAC; the most common form of pancreatic cancer) to determine if IAPP loss in diabetes may increase the risk of pancreatic cancer. METHODS PANC-1, MIA PaCa-2, and H1299 cells were treated with rodent IAPP, and the IAPP analogs pramlintide and davalintide, and assayed for changes in proliferation, death, and glycolysis. An IAPP-deficient mouse model of PDAC (Iapp-/-; Kras+/LSL-G12D; Trp53flox/flox; Ptf1a+/CreER) was generated for survival analysis. RESULTS IAPP did not impact glycolysis in MIA PaCa-2 cells, and did not impact cell death, proliferation, or glycolysis in PANC-1 cells or in H1299 cells, which were previously reported as IAPP-sensitive. Iapp deletion in Kras+/LSL-G12D; Trp53flox/flox; Ptf1a+/CreER mice had no effect on survival time to lethal tumour burden. CONCLUSIONS In contrast to previous reports, we find that IAPP does not function as a tumour suppressor. This suggests that loss of IAPP signalling likely does not increase the risk of pancreatic cancer in individuals with diabetes.
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Affiliation(s)
- Austin J Taylor
- BC Children's Hospital Research Institute, Vancouver, BC, Canada; Centre for Molecular Medicine and Therapeutics, Vancouver, BC, Canada; Department of Pathology and Laboratory Medicine, University of British Columbia, BC, Canada
| | - Evgeniy Panzhinskiy
- Life Sciences Institute, University of British Columbia, BC, Canada; Department of Biochemistry, University of British Columbia, BC, Canada
| | - Paul C Orban
- BC Children's Hospital Research Institute, Vancouver, BC, Canada; Centre for Molecular Medicine and Therapeutics, Vancouver, BC, Canada; Department of Surgery, University of British Columbia, BC, Canada
| | - Francis C Lynn
- BC Children's Hospital Research Institute, Vancouver, BC, Canada; Department of Surgery, University of British Columbia, BC, Canada; Department of Cellular and Physiological Sciences, University of British Columbia, BC, Canada
| | - David F Schaeffer
- Department of Pathology and Laboratory Medicine, University of British Columbia, BC, Canada; Pancreas Centre BC, Vancouver, BC, Canada
| | - James D Johnson
- Life Sciences Institute, University of British Columbia, BC, Canada; Department of Cellular and Physiological Sciences, University of British Columbia, BC, Canada
| | - Janel L Kopp
- Life Sciences Institute, University of British Columbia, BC, Canada; Department of Cellular and Physiological Sciences, University of British Columbia, BC, Canada
| | - C Bruce Verchere
- BC Children's Hospital Research Institute, Vancouver, BC, Canada; Centre for Molecular Medicine and Therapeutics, Vancouver, BC, Canada; Department of Pathology and Laboratory Medicine, University of British Columbia, BC, Canada; Department of Surgery, University of British Columbia, BC, Canada.
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22
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Rutherford SH, Baker MJ, Hunt NT. 2D-IR spectroscopy of proteins in H 2O-A Perspective. J Chem Phys 2023; 158:030901. [PMID: 36681646 DOI: 10.1063/5.0129480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
The form of the amide I infrared absorption band provides a sensitive probe of the secondary structure and dynamics of proteins in the solution phase. However, the frequency coincidence of the amide I band with the bending vibrational mode of H2O has necessitated the widespread use of deuterated solvents. Recently, it has been demonstrated that ultrafast 2D-IR spectroscopy allows the detection of the protein amide I band in H2O-based fluids, meaning that IR methods can now be applied to study proteins in physiologically relevant solvents. In this perspective, we describe the basis of the 2D-IR method for observing the protein amide I band in H2O and show how this development has the potential to impact areas ranging from our fundamental appreciation of protein structural dynamics to new applications for 2D-IR spectroscopy in the analytical and biomedical sciences. In addition, we discuss how the spectral response of water, rather than being a hindrance, now provides a basis for new approaches to data pre-processing, standardization of 2D-IR data collection, and signal quantification. Ultimately, we visualize a direction of travel toward the creation of 2D-IR spectral libraries that can be linked to advanced computational methods for use in high-throughput protein screening and disease diagnosis.
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Affiliation(s)
- Samantha H Rutherford
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Technology and Innovation Centre, 99 George Street, Glasgow G1 1RD, United Kingdom
| | - Matthew J Baker
- School of Medicine, Faculty of Clinical Biomedical Sciences, University of Central Lancashire, Preston PR1 2HE, United Kingdom
| | - Neil T Hunt
- Department of Chemistry and York Biomedical Research Institute, University of York, York YO10 5DD, United Kingdom
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23
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Yang Y, Wang Q, Li G, Guo W, Yang Z, Liu H, Deng X. Cysteine-Derived Chiral Carbon Quantum Dots: A Fibrinolytic Activity Regulator for Plasmin to Target the Human Islet Amyloid Polypeptide for Type 2 Diabetes Mellitus. ACS Appl Mater Interfaces 2023; 15:2617-2629. [PMID: 36596222 DOI: 10.1021/acsami.2c17975] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
The fibrillization and deposition of the human islet amyloid polypeptide (hIAPP) are the pathological hallmark of type 2 diabetes mellitus (T2DM), and these insoluble fibrotic depositions of hIAPP are considered to strongly affect insulin secretion by inducing toxicity toward pancreatic islet β-cells. The current strategy of preventing amyloid aggregation by nanoparticle-assisted inhibitors can only disassemble fibrotic amyloids into more toxic oligomers and/or protofibrils. Herein, for the first time, we propose a type of cysteine-derived chiral carbon quantum dot (CQD) that targets plasmin, a core natural fibrinolytic protease in humans. These CQDs can serve as fibrinolytic activity regulators for plasmin to cleave hIAPP into nontoxic polypeptides or into even smaller amino acid fragments, thus alleviating hIAPP's fibrotic amyloid-induced cytotoxicity. Our experiments indicate that chiral CQDs have opposing effects on plasmin activity. The l-CQDs promote the cleavage of hIAPP by enhancing plasmin activity at a promotion ratio of 23.2%, thus protecting β-cells from amyloid-induced toxicity. In contrast, the resultant d-CQDs significantly inhibit proteolysis, decreasing plasmin activity by 31.5% under the same reaction conditions. Second harmonic generation (SHG) microscopic imaging is initially used to dynamically characterize hIAPP before and after proteolysis. The l-CQD promotion of plasmin activity thus provides a promising avenue for the hIAPP-targeted treatment of T2DM to treat low fibrinolytic activity, while the d-CQDs, as inhibitors of plasmin activity, may improve patient survival for hyperfibrinolytic conditions, such as those existing during surgeries and traumas.
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Affiliation(s)
- Yongzhen Yang
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou510631, China
- Guangdong Provincial Key Laboratory of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou510631, China
- Guangzhou Key Laboratory of Spectral Analysis and Functional Probes, College of Biophotonics, South China Normal University, Guangzhou510631, China
| | - Qin Wang
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou510631, China
- Guangdong Provincial Key Laboratory of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou510631, China
- Guangzhou Key Laboratory of Spectral Analysis and Functional Probes, College of Biophotonics, South China Normal University, Guangzhou510631, China
| | - Gongjian Li
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou510631, China
- Guangdong Provincial Key Laboratory of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou510631, China
- Guangzhou Key Laboratory of Spectral Analysis and Functional Probes, College of Biophotonics, South China Normal University, Guangzhou510631, China
| | - Wenjing Guo
- Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou510530, China
| | - Zuojun Yang
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou510631, China
- Guangdong Provincial Key Laboratory of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou510631, China
- Guangzhou Key Laboratory of Spectral Analysis and Functional Probes, College of Biophotonics, South China Normal University, Guangzhou510631, China
| | - Hao Liu
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou510631, China
- Guangdong Provincial Key Laboratory of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou510631, China
- Guangzhou Key Laboratory of Spectral Analysis and Functional Probes, College of Biophotonics, South China Normal University, Guangzhou510631, China
| | - Xiaoyuan Deng
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou510631, China
- Guangdong Provincial Key Laboratory of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou510631, China
- Guangzhou Key Laboratory of Spectral Analysis and Functional Probes, College of Biophotonics, South China Normal University, Guangzhou510631, China
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24
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Abstract
Aberrant protein aggregation leads to the formation of amyloid fibrils. This phenomenon is linked to the development of more than 40 irremediable diseases such as Alzheimer's disease, Parkinson's disease, type 2 diabetes, and cancer. Plenty of research efforts have been given to understanding the underlying mechanism of protein aggregation, associated toxicity, and the development of amyloid inhibitors. Recently, the peptidomimetic approach has emerged as a potential tool to modulate several protein-protein interactions (PPIs). In this review, we discussed selected peptidomimetic-based approaches for the modulation of important amyloid proteins (Islet Amyloid Polypeptide, Amyloid Beta, α-synuclein, mutant p53, and insulin) aggregation. This approach holds a powerful platform for creating an essential stepping stone for the vital development of anti-amyloid therapeutic agents.
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Affiliation(s)
- Debabrata Maity
- Department of Organic Synthesis and Process Chemistry, CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad, 500007, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
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25
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Miller MET, Li MH, Baghai A, Peetz VH, Zhyvoloup A, Raleigh DP. Analysis of Sheep and Goat IAPP Provides Insight into IAPP Amyloidogenicity and Cytotoxicity. Biochemistry 2022; 61:2531-2545. [DOI: 10.1021/acs.biochem.2c00470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Matthew E. T. Miller
- Department of Chemistry, Stony Brook University, Nicolls Road, Stony Brook, New York 11790, United States
| | - Ming-Hao Li
- Graduate Program in Biochemistry and Structural Biology, Stony Brook University, Stony Brook, New York 11790, United States
| | - Aria Baghai
- Institute of Structural and Molecular Biology, University College London, Gower Street, London WC1E 6BT, United Kingdom
| | - Vincent H. Peetz
- Department of Chemistry, Stony Brook University, Nicolls Road, Stony Brook, New York 11790, United States
| | - Alexander Zhyvoloup
- Institute of Structural and Molecular Biology, University College London, Gower Street, London WC1E 6BT, United Kingdom
| | - Daniel P. Raleigh
- Department of Chemistry, Stony Brook University, Nicolls Road, Stony Brook, New York 11790, United States
- Institute of Structural and Molecular Biology, University College London, Gower Street, London WC1E 6BT, United Kingdom
- Laufer Center for Physical and Quantitative Biology, Stony Brook University, Stony Brook, New York 11794, United States
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26
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Manathunga L, Zhyvoloup A, Baghai A, Raleigh DP. Differential Effects of Aromatic Residues on Amyloid Formation and Cytotoxicity of Human IAPP. Biochemistry 2022; 61:2334-2343. [PMID: 36215164 DOI: 10.1021/acs.biochem.2c00267] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Islet amyloid polypeptide (IAPP) is a 37-residue polypeptide hormone secreted by the pancreatic β-cells. IAPP plays a role in glycemic regulation, but in the pre-type-2 diabetic state, it aggregates to form an islet amyloid. The process of islet amyloid formation contributes to β-cell dysfunction and disease progression. The features of the IAPP sequence that modulate amyloid formation are still not understood. Human IAPP contains three aromatic residues, F15, F23, and Y37. F15 and Y37 are highly conserved, while F23 is more commonly a Leu or Ile in other species. The role of the aromatic residues in modulating the time course of amyloid formation and the cytotoxicity was examined using aromatic to Leu mutations. All three single and double mutants and the triple mutant were studied. F23 plays a dominant role in both amyloid formation and toxicity. An F15L mutant accelerated amyloid formation, a Y37L mutant had little effect, while an F23L replacement slowed amyloid formation by a factor of 2.6. Double mutants, which contained an F23L replacement, had a larger effect than those that did not, and there are non-additive effects between pairs of aromatic residues. F23 also plays a key role in toxicity. Single or multiple mutants that contain the F23L replacement were noticeably less toxic than the wild-type or mutants which did not include the F23L substitution. In contrast, the F15L mutant was more toxic than the wild-type one. The implications for IAPP amyloid formation and for the design of non-aggregating analogues of IAPP are discussed.
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Affiliation(s)
- Lakshan Manathunga
- Department of Chemistry, Stony Brook University, Nicolls Road, Stony Brook, New York 11790, United States.,Laufer Center for Physical and Quantitative Biology, Stony Brook University, Stony Brook, New York 11794, United States
| | - Alexander Zhyvoloup
- Institute of Structural and Molecular Biology, University College London, Gower Street, London WC1E 6BT, U.K
| | - Aria Baghai
- Institute of Structural and Molecular Biology, University College London, Gower Street, London WC1E 6BT, U.K
| | - Daniel P Raleigh
- Department of Chemistry, Stony Brook University, Nicolls Road, Stony Brook, New York 11790, United States.,Institute of Structural and Molecular Biology, University College London, Gower Street, London WC1E 6BT, U.K.,Laufer Center for Physical and Quantitative Biology, Stony Brook University, Stony Brook, New York 11794, United States
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27
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Fortier M, Côté-Cyr M, Nguyen V, Babych M, Nguyen PT, Gaudreault R, Bourgault S. Contribution of the 12–17 hydrophobic region of islet amyloid polypeptide in self-assembly and cytotoxicity. Front Mol Biosci 2022; 9:1017336. [PMID: 36262476 PMCID: PMC9573943 DOI: 10.3389/fmolb.2022.1017336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Accepted: 09/15/2022] [Indexed: 11/17/2022] Open
Abstract
The islet amyloid polypeptide (IAPP) is a 37-residue aggregation-prone peptide hormone whose deposition as insoluble fibrils in the islets of Langerhans is associated with type II diabetes. Therapeutic interventions targeting IAPP amyloidogenesis, which contributes to pancreatic β-cell degeneration, remain elusive owing to the lack of understanding of the self-assembly mechanisms and of the quaternary proteospecies mediating toxicity. While countless studies have investigated the contributions of the 20–29 amyloidogenic core in self-assembly, IAPP central region, i.e. positions 11 to 19, has been less studied, notwithstanding its potential key role in oligomerization. In this context, the present study aimed at investigating the physicochemical and conformational properties driving IAPP self-assembly and associated cytotoxicity. Computational tools and all-atom molecular dynamics simulation suggested that the hydrophobic 12–17 segment promotes IAPP self-recognition and aggregation. Alanine scanning revealed that the hydrophobic side chains of Leu12, Phe15 and Val17 are critical for amyloid fibril formation. Destabilization of the α-helical folding by Pro substitution enhanced self-assembly when the pyrrolidine ring was successively introduced at positions Ala13, Asn14 and Phe15, in comparison to respective Ala-substituted counterparts. Modulating the peptide backbone flexibility at position Leu16 through successive incorporation of Pro, Gly and α-methylalanine, inhibited amyloid formation and reduced cytotoxicity, while the isobutyl side chain of Leu16 was not critical for self-assembly and IAPP-mediated toxicity. These results highlight the importance of the 12–17 hydrophobic region of IAPP for self-recognition, ultimately supporting the development of therapeutic approaches to prevent oligomerization and/or fibrillization.
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Affiliation(s)
- Mathilde Fortier
- Department of Chemistry, Succursale Centre-Ville, Université du Québec à Montréal, Montreal, QC, Canada
- Quebec Network for Research on Protein Function, Engineering and Applications, PROTEO, Montreal, QC, Canada
| | - Mélanie Côté-Cyr
- Department of Chemistry, Succursale Centre-Ville, Université du Québec à Montréal, Montreal, QC, Canada
- Quebec Network for Research on Protein Function, Engineering and Applications, PROTEO, Montreal, QC, Canada
| | - Vy Nguyen
- Department of Chemistry, Succursale Centre-Ville, Université du Québec à Montréal, Montreal, QC, Canada
- Quebec Network for Research on Protein Function, Engineering and Applications, PROTEO, Montreal, QC, Canada
| | - Margaryta Babych
- Department of Chemistry, Succursale Centre-Ville, Université du Québec à Montréal, Montreal, QC, Canada
- Quebec Network for Research on Protein Function, Engineering and Applications, PROTEO, Montreal, QC, Canada
| | - Phuong Trang Nguyen
- Department of Chemistry, Succursale Centre-Ville, Université du Québec à Montréal, Montreal, QC, Canada
- Quebec Network for Research on Protein Function, Engineering and Applications, PROTEO, Montreal, QC, Canada
| | - Roger Gaudreault
- Department of Chemistry, Succursale Centre-Ville, Université du Québec à Montréal, Montreal, QC, Canada
- Department of Physics, Université de Montréal, Succursale Centre-ville, Montreal, QC, Canada
- *Correspondence: Roger Gaudreault, ; Steve Bourgault,
| | - Steve Bourgault
- Department of Chemistry, Succursale Centre-Ville, Université du Québec à Montréal, Montreal, QC, Canada
- Quebec Network for Research on Protein Function, Engineering and Applications, PROTEO, Montreal, QC, Canada
- *Correspondence: Roger Gaudreault, ; Steve Bourgault,
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28
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Castillo JJ, Aplin AC, Hackney DJ, Hogan MF, Esser N, Templin AT, Akter R, Kahn SE, Raleigh DP, Zraika S, Hull RL. Islet amyloid polypeptide aggregation exerts cytotoxic and proinflammatory effects on the islet vasculature in mice. Diabetologia 2022; 65:1687-1700. [PMID: 35871651 PMCID: PMC10208275 DOI: 10.1007/s00125-022-05756-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Accepted: 04/28/2022] [Indexed: 01/29/2023]
Abstract
AIMS/HYPOTHESIS The islet vasculature, including its constituent islet endothelial cells, is a key contributor to the microenvironment necessary for normal beta cell health and function. In type 2 diabetes, islet amyloid polypeptide (IAPP) aggregates, forming amyloid deposits that accumulate between beta cells and islet capillaries. This process is known to be toxic to beta cells but its impact on the islet vasculature has not previously been studied. Here, we report the first characterisation of the effects of IAPP aggregation on islet endothelial cells/capillaries using cell-based and animal models. METHODS Primary and immortalised islet endothelial cells were treated with amyloidogenic human IAPP (hIAPP) alone or in the presence of the amyloid blocker Congo Red or the Toll-like receptor (TLR) 2/4 antagonist OxPAPc. Cell viability was determined0 along with mRNA and protein levels of inflammatory markers. Islet capillary abundance, morphology and pericyte coverage were determined in pancreases from transgenic mice with beta cell expression of hIAPP using conventional and confocal microscopy. RESULTS Aggregated hIAPP decreased endothelial cell viability in immortalised and primary islet endothelial cells (by 78% and 60%, respectively) and significantly increased expression of inflammatory markers Il6, Vcam1 and Edn1 mRNA relative to vehicle treatment in both cell types (p<0.05; n=4). Both cytotoxicity and the proinflammatory response were ameliorated by Congo Red (p<0.05; n=4); whereas TLR2/4-inhibition blocked inflammatory gene expression (p<0.05; n=6) without improving viability. Islets from high-fat-diet-fed amyloid-laden hIAPP transgenic mice also exhibited significantly increased expression of most markers of endothelial inflammation (p<0.05; n=5) along with decreased capillary density compared with non-transgenic littermates fed the same diet (p<0.01). Moreover, a 16% increase in capillary diameter was observed in amyloid-adjacent capillaries (p<0.01), accompanied by a doubling in pericyte structures positive for neuron-glial antigen 2 (p<0.001). CONCLUSIONS/INTERPRETATION Islet endothelial cells are susceptible to hIAPP-induced cytotoxicity and exhibit a TLR2/4-dependent proinflammatory response to aggregated hIAPP. Additionally, we observed amyloid-selective effects that decreased islet capillary density, accompanied by increased capillary diameter and increased pericyte number. Together, these data demonstrate that the islet vasculature is a target of the cytotoxic and proinflammatory effects of aggregated hIAPP that likely contribute to the detrimental effects of hIAPP aggregation on beta cell function and survival in type 2 diabetes.
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Affiliation(s)
- Joseph J Castillo
- Department of Veterans Affairs Puget Sound Health Care System, Seattle, WA, USA
- Division of Metabolism, Endocrinology, and Nutrition, Department of Medicine, University of Washington, Seattle, WA, USA
| | - Alfred C Aplin
- Department of Veterans Affairs Puget Sound Health Care System, Seattle, WA, USA
| | - Daryl J Hackney
- Department of Veterans Affairs Puget Sound Health Care System, Seattle, WA, USA
| | - Meghan F Hogan
- Department of Veterans Affairs Puget Sound Health Care System, Seattle, WA, USA
- Division of Metabolism, Endocrinology, and Nutrition, Department of Medicine, University of Washington, Seattle, WA, USA
| | - Nathalie Esser
- Department of Veterans Affairs Puget Sound Health Care System, Seattle, WA, USA
- Division of Metabolism, Endocrinology, and Nutrition, Department of Medicine, University of Washington, Seattle, WA, USA
| | - Andrew T Templin
- Department of Veterans Affairs Puget Sound Health Care System, Seattle, WA, USA
- Division of Metabolism, Endocrinology, and Nutrition, Department of Medicine, University of Washington, Seattle, WA, USA
| | - Rehana Akter
- Department of Veterans Affairs Puget Sound Health Care System, Seattle, WA, USA
- Division of Metabolism, Endocrinology, and Nutrition, Department of Medicine, University of Washington, Seattle, WA, USA
| | - Steven E Kahn
- Department of Veterans Affairs Puget Sound Health Care System, Seattle, WA, USA
- Division of Metabolism, Endocrinology, and Nutrition, Department of Medicine, University of Washington, Seattle, WA, USA
| | - Daniel P Raleigh
- Department of Chemistry, Stony Brook University, Stony Brook, NY, USA
- Research Department of Structural and Molecular Biology, University College London, London, UK
| | - Sakeneh Zraika
- Department of Veterans Affairs Puget Sound Health Care System, Seattle, WA, USA
- Division of Metabolism, Endocrinology, and Nutrition, Department of Medicine, University of Washington, Seattle, WA, USA
| | - Rebecca L Hull
- Department of Veterans Affairs Puget Sound Health Care System, Seattle, WA, USA.
- Division of Metabolism, Endocrinology, and Nutrition, Department of Medicine, University of Washington, Seattle, WA, USA.
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29
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Wang Y, Liu Y, Zhang Y, Wei G, Ding F, Sun Y. Molecular insights into the oligomerization dynamics and conformations of amyloidogenic and non-amyloidogenic amylin from discrete molecular dynamics simulations. Phys Chem Chem Phys 2022; 24:21773-21785. [PMID: 36098068 PMCID: PMC9623603 DOI: 10.1039/d2cp02851d] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/26/2023]
Abstract
The amyloid aggregation of human islet amyloid polypeptide (hIAPP) is associated with pancreatic β-cell death in type 2 diabetes. The S20G substitution of hIAPP (hIAPP(S20G)), found in Japanese and Chinese people, is more amyloidogenic and cytotoxic than wild-type hIAPP. Rat amylin (rIAPP) does not have aggregation propensity or cytotoxicity. Mounting evidence suggests that soluble low-molecular-weight amyloid oligomers formed during early aggregation are more cytotoxic than mature fibrils. The self-assembly dynamics and oligomeric conformations remain unknown because the oligomers are heterogeneous and transient. The molecular mechanism of sequence-variation rendering dramatically different aggregation propensity and cytotoxicity is also elusive. Here, we investigate the oligomerization dynamics and conformations of amyloidogenic hIAPP, hIAPP(S20G), and non-amyloidogenic rIAPP using atomistic discrete molecular dynamics (DMD) simulations. Our simulation results demonstrated that all three monomeric amylin peptides mainly adopted an unstructured formation with partial dynamical helices near the N-terminus. Relatively transient β-hairpins were more abundant in hIAPP and hIAPP(S20G) than in rIAPP. The S20G-substituting mutant of hIAPP altered the turn region of the β-hairpin motif, resulting in more hydrophobic residue-pairwise contacts within the β-hairpin. Oligomerization dynamic investigation revealed that all three peptides spontaneously accumulated into helix-populated oligomers. The conformational conversion to form β-sheet-rich oligomers was only observed in hIAPP and hIAPP(S20G). The population of high-β-sheet-content oligomers was enhanced by S20G substitution. Interestingly, both hIAPP and hIAPP(S20G) could form β-barrel formations, and the β-barrel propensity of hIAPP(S20G) was three times larger than that of hIAPP. No β-sheet-rich or β-barrel formations were observed in rIAPP. Our direct observation of the correlation between β-barrel oligomer formation and cytotoxicity suggests that β-barrels might play a critically important role in the cytotoxicity of amyloidosis.
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Affiliation(s)
- Ying Wang
- Department of Physics, Ningbo University, Ningbo 315211, China.
| | - Yuying Liu
- Department of Physics, Ningbo University, Ningbo 315211, China.
| | - Yu Zhang
- Department of Physics, Ningbo University, Ningbo 315211, China.
| | - Guanghong Wei
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, P. R. China
| | - Feng Ding
- Department of Physics and Astronomy, Clemson University, Clemson, SC 29634, USA
| | - Yunxiang Sun
- Department of Physics, Ningbo University, Ningbo 315211, China.
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, P. R. China
- Department of Physics and Astronomy, Clemson University, Clemson, SC 29634, USA
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30
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Shardlow E, Brown L, Exley C. The influence of aluminium and copper upon the early aggregatory behaviour and size of Islet amyloid polypeptide under simulated physiological conditions. J Trace Elem Med Biol 2022; 73:127027. [PMID: 35868166 DOI: 10.1016/j.jtemb.2022.127027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Revised: 06/03/2022] [Accepted: 06/20/2022] [Indexed: 11/19/2022]
Abstract
BACKGROUND AND AIM Islet amyloid polypeptide/amylin deposition in the form of amyloid plaques is a common pathological feature observed in the pancreatic tissue of those with Type II Diabetes Mellitus. Its propensity to form amyloid fibrils and the resultant toxicity of this peptide in vivo is influenced by both the concentration and species of metal present in situ. Herein, we examine the influence of Al (III) and Cu (II), applied at equimolar and supra-stoichiometric concentrations on the initial aggregatory behaviour of amylin under near physiological conditions. METHODS Dynamic light scattering measurements, which monitored the aggregation status and size of the peptide in real time, were performed during the early lag-phase of fibrillogenesis (T ≤ 30 min) in the absence or presence of metal ions. RESULTS Islet amyloid polypeptide (10 µM) rapidly aggregated when introduced into a physiological medium favouring the formation of large, agglomerated structures (> 1000 nm) after 30 min incubation. Neither the addition of equimolar or excess metals significantly influenced the size of the peptide when intensity distributions were consulted; however, number distributions indicated that both Al (III) and Cu (II) may have had, an albeit temporary, stabilising influence upon the conformations present within solution. CONCLUSION These results infer that small oligomeric species are likely transient entities that are rapidly incorporated into large agglomerates during the very initial stages of fibrillogenesis. While both Al (III) and Cu (II) both inhibited agglomeration to some degree, their stabilising affect upon peptide aggregation was limited over the juncture of the experiments performed herein; hence, it is difficult to say whether these metal ions play a role in enhancing the toxicity of these peptides through influencing their aggregation in the short-term.
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Affiliation(s)
- Emma Shardlow
- The Birchall Centre, Lennard-Jones Laboratories, Keele University, Keele, Staffordshire ST5 5BG, UK.
| | - Lewis Brown
- The Birchall Centre, Lennard-Jones Laboratories, Keele University, Keele, Staffordshire ST5 5BG, UK
| | - Christopher Exley
- The Birchall Centre, Lennard-Jones Laboratories, Keele University, Keele, Staffordshire ST5 5BG, UK
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31
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Dicke SS, Maj M, Fields CR, Zanni MT. Metastable intermediate during hIAPP aggregation catalyzed by membranes as detected with 2D IR spectroscopy. RSC Chem Biol 2022; 3:931-940. [PMID: 35866164 PMCID: PMC9257649 DOI: 10.1039/d2cb00028h] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Accepted: 05/24/2022] [Indexed: 11/26/2022] Open
Abstract
The aggregation of human islet amyloid polypeptide (hIAPP) into amyloid fibrils involves formation of oligomeric intermediates that are thought to be the cytotoxic species responsible for β-cell dysfunction in type 2 diabetes. hIAPP oligomers permeating or disrupting the cellular membrane may be one mechanism of toxicity and so measuring the structural kinetics of aggregation in the presence of membranes is of much interest. In this study, we use 2D IR spectroscopy and 13C18O isotope labeling to study the secondary structure of the oligomeric intermediates formed in solution and in the presence of phospholipid vesicles at sites L12A13, L16V17, G24A25 and V32G33. Pairs of labels monitor the couplings between associated polypeptides and the dihedral angles between adjacent residues. In solution, the L12A13 residues form an oligomeric β-sheet in addition to an α-helix whereas with the phospholipid vesicles they are α-helical throughout the aggregation process. In both solution and with DOPC vesicles, L16V17 and V32G33 have disordered structures until fibrils are formed. Similarly, under both conditions, G24A25 exhibits 3-state kinetics, created by an oligomeric intermediate with a well-defined β-sheet structure. Amyloid fibril formation is often thought to involve intermediates with exceedingly low populations that are difficult to detect experimentally. These experiments establish that amyloid fibril formation of hIAPP when catalyzed by membranes includes a metastable intermediate and that this intermediate has a similar structure at G24A25 in the FGAIL region as the corresponding intermediate in solution, thought to be the toxic species. 2D IR and 13C18O isotope labeling establish that amyloid formation of hIAPP catalyzed by membranes includes a metastable intermediate with a similar structure at G24A25 in the FGAIL region as the corresponding intermediate in solution.![]()
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Affiliation(s)
- Sidney S Dicke
- Department of Chemistry, University of Wisconsin-Madison 1101 University Avenue Madison WI 53706 USA
| | - Michał Maj
- Department of Chemistry, University of Wisconsin-Madison 1101 University Avenue Madison WI 53706 USA .,Formally at Department of Chemistry, University of Wisconsin-Madison 1101 University Avenue Madison WI 53706 USA
| | - Caitlyn R Fields
- Department of Chemistry, University of Wisconsin-Madison 1101 University Avenue Madison WI 53706 USA
| | - Martin T Zanni
- Department of Chemistry, University of Wisconsin-Madison 1101 University Avenue Madison WI 53706 USA
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Abstract
Type II diabetes is characterized by the loss of pancreatic β-cells. This loss is thought to be a consequence of membrane disruption, caused by the aggregation of islet amyloid polypeptide (IAPP) into amyloid fibrils. However, the molecular mechanisms of IAPP aggregation in the presence of membranes have remained unclear. Here, we use kinetic analysis to elucidate the aggregation mechanism of IAPP in the presence of mixed zwitterionic and anionic lipid membranes. The results converge to a model in which aggregation on the membrane is strongly dominated by secondary nucleation, that is, the formation of new nuclei on the surface of existing fibrils. The critical nucleus consists of a single IAPP molecule, and anionic lipids catalyze both primary and secondary nucleation, but not elongation. The fact that anionic lipids promote secondary nucleation implies that these events take place at the interface between the membrane and existing fibrils, demonstrating that fibril growth occurs at least to some extent on the membrane surface. These new insights into the mechanism of IAPP aggregation on membranes may help to understand IAPP toxicity and will be important for the development of therapeutics to prevent β-cell death in type II diabetes.
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Affiliation(s)
- Barend O W Elenbaas
- Membrane Biochemistry and Biophysics, Bijvoet Centre for Biomolecular Research, Utrecht University, Padualaan 8, Utrecht 3584 CH, Netherlands
| | - Lucie Khemtemourian
- Institute of Chemistry & Biology of Membranes & Nano-objects (CBMN), CNRS UMR5248, University of Bordeaux, Bordeaux INP, allée Geoffroy St-Hilaire, Pessac 33600, France
| | - J Antoinette Killian
- Membrane Biochemistry and Biophysics, Bijvoet Centre for Biomolecular Research, Utrecht University, Padualaan 8, Utrecht 3584 CH, Netherlands
| | - Tessa Sinnige
- Membrane Biochemistry and Biophysics, Bijvoet Centre for Biomolecular Research, Utrecht University, Padualaan 8, Utrecht 3584 CH, Netherlands
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Hassan S, White KN, Terry C. Linking hIAPP misfolding and aggregation with type 2 diabetes mellitus: a structural perspective. Biosci Rep 2022:BSR20211297. [PMID: 35475576 DOI: 10.1042/BSR20211297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Revised: 04/12/2022] [Accepted: 04/26/2022] [Indexed: 11/17/2022] Open
Abstract
There are over 40 identified human disorders that involve certain proteins folding incorrectly, accumulating in the body causing damage to cells and organs and causing disease. Type 2 Diabetes Mellitus (T2DM) is one of these protein misfolding disorders (PMDs) and involves human islet amyloid polypeptide (hIAPP) misfolding and accumulating in parts of the body, primarily in the pancreas, causing damage to islet cells and affecting glucose regulation. In this review, we have summarised our current understanding of what causes hIAPP to misfold, what conformations are found in different parts of the body with a particular focus on what is known about the structure of hIAPP and how this links to T2DM. Understanding the molecular basis behind these misfolding events is essential for understanding the role of hIAPP to develop better therapeutics since type 2 diabetes currently affects over 4.9 million people in the United Kingdom alone and is predicted to increase as our population ages.
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Roham PH, Save SN, Sharma S. Human islet amyloid polypeptide: A therapeutic target for the management of type 2 diabetes mellitus. J Pharm Anal 2022; 12:556-569. [PMID: 36105173 PMCID: PMC9463490 DOI: 10.1016/j.jpha.2022.04.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Revised: 03/21/2022] [Accepted: 04/01/2022] [Indexed: 12/22/2022] Open
Abstract
Type 2 diabetes mellitus (T2DM) and other metabolic disorders are often silent and go unnoticed in patients because of the lack of suitable prognostic and diagnostic markers. The current therapeutic regimens available for managing T2DM do not reverse diabetes; instead, they delay the progression of diabetes. Their efficacy (in principle) may be significantly improved if implemented at earlier stages. The misfolding and aggregation of human islet amyloid polypeptide (hIAPP) or amylin has been associated with a gradual decrease in pancreatic β-cell function and mass in patients with T2DM. Hence, hIAPP has been recognized as a therapeutic target for managing T2DM. This review summarizes hIAPP's role in mediating dysfunction and apoptosis in pancreatic β-cells via induction of endoplasmic reticulum stress, oxidative stress, mitochondrial dysfunction, inflammatory cytokine secretion, autophagy blockade, etc. Furthermore, it explores the possibility of using intermediates of the hIAPP aggregation pathway as potential drug targets for T2DM management. Finally, the effects of common antidiabetic molecules and repurposed drugs; other hIAPP mimetics and peptides; small organic molecules and natural compounds; nanoparticles, nanobodies, and quantum dots; metals and metal complexes; and chaperones that have demonstrated potential to inhibit and/or reverse hIAPP aggregation and can, therefore, be further developed for managing T2DM have been discussed. Misfolded species of hIAPP form toxic oligomers in pancreatic β-cells. hIAPP amyloids has been detected in the pancreas of about 90% subjects with T2DM. Inhibitors of hIAPP aggregation can help manage T2DM.
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Hassan MN, Nabi F, Khan AN, Hussain M, Siddiqui WA, Uversky VN, Khan RH. The amyloid state of proteins: A boon or bane? Int J Biol Macromol 2022; 200:593-617. [PMID: 35074333 DOI: 10.1016/j.ijbiomac.2022.01.115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 01/17/2022] [Accepted: 01/18/2022] [Indexed: 11/05/2022]
Abstract
Proteins and their aggregation is significant field of research due to their association with various conformational maladies including well-known neurodegenerative diseases like Alzheimer's (AD), Parkinson's (PD), and Huntington's (HD) diseases. Amyloids despite being given negative role for decades are also believed to play a functional role in bacteria to humans. In this review, we discuss both facets of amyloid. We have shed light on AD, which is one of the most common age-related neurodegenerative disease caused by accumulation of Aβ fibrils as extracellular senile plagues. We also discuss PD caused by the aggregation and deposition of α-synuclein in form of Lewy bodies and neurites. Other amyloid-associated diseases such as HD and amyotrophic lateral sclerosis (ALS) are also discussed. We have also reviewed functional amyloids that have various biological roles in both prokaryotes and eukaryotes that includes formation of biofilm and cell attachment in bacteria to hormone storage in humans, We discuss in detail the role of Curli fibrils' in biofilm formation, chaplins in cell attachment to peptide hormones, and Pre-Melansomal Protein (PMEL) roles. The disease-related and functional amyloids are compared with regard to their structural integrity, variation in regulation, and speed of forming aggregates and elucidate how amyloids have turned from foe to friend.
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Affiliation(s)
- Md Nadir Hassan
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
| | - Faisal Nabi
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
| | - Asra Nasir Khan
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
| | - Murtaza Hussain
- Department of Biochemistry, Aligarh Muslim University, Aligarh 202002, India
| | - Waseem A Siddiqui
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
| | - Vladimir N Uversky
- Protein Research Group, Institute for Biological Instrumentation of the Russian Academy of Sciences, 10 Federal Research Center "Pushchino Scientific Center for Biological Research of the Russian Academy 11 of Sciences", Pushchino, Moscow Region 142290, Russia; Department of Molecular Medicine, USF Health Byrd Alzheimer's Research Institute, Morsani College 13 of Medicine, University of South Florida, Tampa, FL 33612, United States
| | - Rizwan Hasan Khan
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India.
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Xu Y, Maya-Martinez R, Guthertz N, Heath GR, Manfield IW, Breeze AL, Sobott F, Foster R, Radford SE. Tuning the rate of aggregation of hIAPP into amyloid using small-molecule modulators of assembly. Nat Commun 2022; 13:1040. [PMID: 35210421 PMCID: PMC8873464 DOI: 10.1038/s41467-022-28660-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Accepted: 01/28/2022] [Indexed: 02/06/2023] Open
Abstract
Human islet amyloid polypeptide (hIAPP) self-assembles into amyloid fibrils which deposit in pancreatic islets of type 2 diabetes (T2D) patients. Here, we applied chemical kinetics to study the mechanism of amyloid assembly of wild-type hIAPP and its more amyloidogenic natural variant S20G. We show that the aggregation of both peptides involves primary nucleation, secondary nucleation and elongation. We also report the discovery of two structurally distinct small-molecule modulators of hIAPP assembly, one delaying the aggregation of wt hIAPP, but not S20G; while the other enhances the rate of aggregation of both variants at substoichiometric concentrations. Investigation into the inhibition mechanism(s) using chemical kinetics, native mass spectrometry, fluorescence titration, SPR and NMR revealed that the inhibitor retards primary nucleation, secondary nucleation and elongation, by binding peptide monomers. By contrast, the accelerator predominantly interacts with species formed in the lag phase. These compounds represent useful chemical tools to study hIAPP aggregation and may serve as promising starting-points for the development of therapeutics for T2D.
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Affiliation(s)
- Yong Xu
- Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, UK
| | - Roberto Maya-Martinez
- Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, UK
| | - Nicolas Guthertz
- Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, UK
| | - George R Heath
- Astbury Centre for Structural Molecular Biology, School of Physics and Astronomy, University of Leeds, Leeds, LS2 9JT, UK
| | - Iain W Manfield
- Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, UK
| | - Alexander L Breeze
- Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, UK
| | - Frank Sobott
- Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, UK
| | - Richard Foster
- Astbury Centre for Structural Molecular Biology, School of Chemistry, University of Leeds, Leeds, LS2 9JT, UK.
| | - Sheena E Radford
- Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, UK.
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Saxena V, Steendam R, Jansen TLC. Distinguishing islet amyloid polypeptide fibril structures with infrared isotope-label spectroscopy. J Chem Phys 2022; 156:055101. [DOI: 10.1063/5.0082322] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Affiliation(s)
- Vishesh Saxena
- University of Groningen, Zernike Institute for Advanced Materials, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Ruben Steendam
- University of Groningen, Zernike Institute for Advanced Materials, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Thomas L. C. Jansen
- University of Groningen, Zernike Institute for Advanced Materials, Nijenborgh 4, 9747 AG Groningen, The Netherlands
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Sahoo BR, Souders CL, Watanabe-Nakayama T, Deng Z, Linton H, Suladze S, Ivanova MI, Reif B, Ando T, Martyniuk CJ, Ramamoorthy A. Conformational Tuning of Amylin by Charged Styrene-Maleic-Acid Copolymers. J Mol Biol 2022; 434:167385. [PMID: 34883118 PMCID: PMC8752516 DOI: 10.1016/j.jmb.2021.167385] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2021] [Revised: 11/25/2021] [Accepted: 11/30/2021] [Indexed: 02/01/2023]
Abstract
Human amylin forms structurally heterogeneous amyloids that have been linked to type-2 diabetes. Thus, understanding the molecular interactions governing amylin aggregation can provide mechanistic insights in its pathogenic formation. Here, we demonstrate that fibril formation of amylin is altered by synthetic amphipathic copolymer derivatives of the styrene-maleic-acid (SMAQA and SMAEA). High-speed AFM is used to follow the real-time aggregation of amylin by observing the rapid formation of de novo globular oligomers and arrestment of fibrillation by the positively-charged SMAQA. We also observed an accelerated fibril formation in the presence of the negatively-charged SMAEA. These findings were further validated by fluorescence, SOFAST-HMQC, DOSY and STD NMR experiments. Conformational analysis by CD and FT-IR revealed that the SMA copolymers modulate the conformation of amylin aggregates. While the species formed with SMAQA are α-helical, the ones formed with SMAEA are rich in β-sheet structure. The interacting interfaces between SMAEA or SMAQA and amylin are mapped by NMR and microseconds all-atom MD simulation. SMAEA displayed π-π interaction with Phe23, electrostatic π-cation interaction with His18 and hydrophobic packing with Ala13 and Val17; whereas SMAQA showed a selective interaction with amylin's C terminus (residues 31-37) that belongs to one of the two β-sheet regions (residues 14-19 and 31-36) involved in amylin fibrillation. Toxicity analysis showed both SMA copolymers to be non-toxic in vitro and the amylin species formed with the copolymers showed minimal deformity to zebrafish embryos. Together, this study demonstrates that chemical tools, such as copolymers, can be used to modulate amylin aggregation, alter the conformation of species.
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Affiliation(s)
- Bikash R Sahoo
- Biophysics Program, The University of Michigan, Ann Arbor, MI 48109, USA; Department of Chemistry, Biomedical Engineering, and Macromolecular Science and Engineering, The University of Michigan, Ann Arbor, MI 48109, USA
| | | | | | - Zhou Deng
- Biophysics Program, The University of Michigan, Ann Arbor, MI 48109, USA
| | - Hunter Linton
- Department of Neurology, University of Michigan, Ann Arbor, MI 48109-2200, USA
| | - Saba Suladze
- Department of Chemistry, Technische Universität München, Garching 85748, Germany
| | - Magdalena I Ivanova
- Biophysics Program, The University of Michigan, Ann Arbor, MI 48109, USA; Department of Neurology, University of Michigan, Ann Arbor, MI 48109-2200, USA
| | - Bernd Reif
- Department of Chemistry, Technische Universität München, Garching 85748, Germany
| | - Toshio Ando
- Bio-AFM Frontier Research Center, Kanazawa University, Kanazawa 9201192, Japan
| | - Christopher J Martyniuk
- Department of Chemistry, Biomedical Engineering, and Macromolecular Science and Engineering, The University of Michigan, Ann Arbor, MI 48109, USA
| | - Ayyalusamy Ramamoorthy
- Biophysics Program, The University of Michigan, Ann Arbor, MI 48109, USA; Department of Chemistry, Biomedical Engineering, and Macromolecular Science and Engineering, The University of Michigan, Ann Arbor, MI 48109, USA.
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Raimundo AF, Ferreira S, Pobre V, Lopes-da-Silva M, Brito JA, dos Santos DJVA, Saraiva N, dos Santos CN, Menezes R. Urolithin B: Two-way attack on IAPP proteotoxicity with implications for diabetes. Front Endocrinol (Lausanne) 2022; 13:1008418. [PMID: 36589826 PMCID: PMC9797523 DOI: 10.3389/fendo.2022.1008418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/31/2022] [Accepted: 11/15/2022] [Indexed: 12/23/2022] Open
Abstract
INTRODUCTION Diabetes is one of the major metabolic diseases worldwide. Despite being a complex systemic pathology, the aggregation and deposition of Islet Amyloid Polypeptide (IAPP), or amylin, is a recognized histopathological marker of the disease. Although IAPP proteotoxicity represents an important trigger of β-cell dysfunction and ultimately death, its exploitation as a therapeutic tool remains underdeveloped. The bioactivity of (poly)phenols towards inhibition of pathological protein aggregation is well known, however, most of the identified molecules have limited bioavailability. METHODS Using a strategy combining in silico, cell-free and cell studies, we scrutinized a unique in-house collection of (poly)phenol metabolites predicted to appear in the human circulation after (poly)phenols ingestion. RESULTS We identified urolithin B as a potent inhibitor of IAPP aggregation and a powerful modulator of cell homeostasis pathways. Urolithin B was shown to affect IAPP aggregation pattern, delaying the formation of amyloid fibrils and altering their size and morphology. The molecular mechanisms underlying urolithin B-mediated protection include protein clearance pathways, mitochondrial function, and cell cycle ultimately rescuing IAPP-mediated cell dysfunction and death. DISCUSSION In brief, our study uncovered urolithin B as a novel small molecule targeting IAPP pathological aggregation with potential to be exploited as a therapeutic tool for mitigating cellular dysfunction in diabetes. Resulting from the colonic metabolism of dietary ellagic acid in the human body, urolithin B bioactivity has the potential to be explored in nutritional, nutraceutical, and pharmacological perspectives.
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Affiliation(s)
- Ana F. Raimundo
- iBET, Instituto de Biologia Experimental e Tecnológica, Oeiras, Portugal
- ITQB-NOVA, Instituto de Tecnologia Química e Biológica António Xavier, Universidade NOVA Lisboa, Oeiras, Portugal
- iNOVA4Health, NOVA Medical School|Faculdade de Ciências Médicas, NMS|FCM, Universidade Nova de Lisboa, Lisboa, Portugal
| | - Sofia Ferreira
- iNOVA4Health, NOVA Medical School|Faculdade de Ciências Médicas, NMS|FCM, Universidade Nova de Lisboa, Lisboa, Portugal
- CBIOS – Universidade Lusófona’s Research Center for Biosciences & Health Technologies, Lisboa, Portugal
- Universidad de Alcalá, Escuela de Doctorado, Departamento de Ciencias Biomédicas, Madrid, Spain
| | - Vânia Pobre
- ITQB-NOVA, Instituto de Tecnologia Química e Biológica António Xavier, Universidade NOVA Lisboa, Oeiras, Portugal
| | - Mafalda Lopes-da-Silva
- iNOVA4Health, NOVA Medical School|Faculdade de Ciências Médicas, NMS|FCM, Universidade Nova de Lisboa, Lisboa, Portugal
| | - José A. Brito
- ITQB-NOVA, Instituto de Tecnologia Química e Biológica António Xavier, Universidade NOVA Lisboa, Oeiras, Portugal
| | | | - Nuno Saraiva
- CBIOS – Universidade Lusófona’s Research Center for Biosciences & Health Technologies, Lisboa, Portugal
| | - Cláudia N. dos Santos
- iBET, Instituto de Biologia Experimental e Tecnológica, Oeiras, Portugal
- iNOVA4Health, NOVA Medical School|Faculdade de Ciências Médicas, NMS|FCM, Universidade Nova de Lisboa, Lisboa, Portugal
| | - Regina Menezes
- iBET, Instituto de Biologia Experimental e Tecnológica, Oeiras, Portugal
- iNOVA4Health, NOVA Medical School|Faculdade de Ciências Médicas, NMS|FCM, Universidade Nova de Lisboa, Lisboa, Portugal
- CBIOS – Universidade Lusófona’s Research Center for Biosciences & Health Technologies, Lisboa, Portugal
- *Correspondence: Regina Menezes,
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King KM, Sharp AK, Davidson DS, Brown AM, Lemkul JA. Impact of Electronic Polarization on Preformed, β-Strand Rich Homogenous and Heterogeneous Amyloid Oligomers. J Comput Biophys Chem 2021; 21:449-460. [PMID: 35756548 DOI: 10.1142/s2737416521420059] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Amyloids are a subset of intrinsically disordered proteins (IDPs) that self-assemble into cross-[Formula: see text] oligomers and fibrils. The structural plasticity of amyloids leads to sampling of metastable, low-molecular-weight oligomers that contribute to cytotoxicity. Of interest are amyloid-[Formula: see text] (A[Formula: see text] and islet amyloid polypeptide (IAPP), which are involved in the pathology of Alzheimer’s disease and Type 2 diabetes mellitus, respectively. In addition to forming homogenous oligomers and fibrils, these species have been found to cross-aggregate in heterogeneous structures. Biophysical properties, including electronic effects, that are unique or conserved between homogenous and heterogeneous amyloids oligomers are thus far unexplored. Here, we simulated homogenous and heterogeneous amyloid oligomers of A[Formula: see text] and IAPP[Formula: see text] fragments using the Drude oscillator model to investigate the impact of electronic polarization on the structural morphology and stability of preformed hexamers. Upon simulation of preformed, [Formula: see text]-strand rich oligomers with Drude, structural rearrangement occurred causing some loss of [Formula: see text]-strand structure in favor of random coil content for all oligomers. Homogenous A[Formula: see text] was the most stable system, deriving stability from low polarization in hydrophobic residues and through salt bridge formation. Changes in polarization were observed primarily for A[Formula: see text] residues in heterogeneous cross-amyloid systems, displaying a decrease in charged residue dipole moments and an increase in hydrophobic sidechain dipole moments. This work is the first study utilizing the Drude-2019 force field with amyloid oligomers, providing insight into the impact of electronic effects on oligomer structure and highlighting the importance of different microenvironments on amyloid oligomer stability.
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Affiliation(s)
- Kelsie M. King
- Program in Genetics, Bioinformatics, and Computational Biology, Virginia Tech, 340 West Campus Dr, Blacksburg, VA 24061, USA
| | - Amanda K. Sharp
- Program in Genetics, Bioinformatics, and Computational Biology, Virginia Tech, 340 West Campus Dr, Blacksburg, VA 24061, USA
| | - Darcy S. Davidson
- Department of Biochemistry, Virginia Tech, 340 West Campus, Dr Blacksburg, VA 24061, USA
| | - Anne M. Brown
- Program in Genetics, Bioinformatics, and Computational Biology, Virginia Tech, 340 West Campus Dr, Blacksburg, VA 24061, USA
- Department of Biochemistry, Virginia Tech, 340 West Campus, Dr Blacksburg, VA 24061, USA
- University Libraries, Virginia Tech, 560 Drillfield, Dr Blacksburg, VA 24061, USA
| | - Justin A. Lemkul
- Department of Biochemistry, Virginia Tech, 340 West Campus, Dr Blacksburg, VA 24061, USA
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Zhang Y, Liu Y, Zhao W, Sun Y. Hydroxylated single-walled carbon nanotube inhibits β2m 21-31 fibrillization and disrupts pre-formed proto-fibrils. Int J Biol Macromol 2021; 193:1-7. [PMID: 34687758 DOI: 10.1016/j.ijbiomac.2021.10.103] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 10/11/2021] [Accepted: 10/14/2021] [Indexed: 11/17/2022]
Abstract
Pathological aggregation of amyloid polypeptides is associated with numerous degenerative diseases. Preventing aggregation and clearing amyloid deposits are considered as promising strategies against amyloidosis. With the capacity of crossing the blood-brain barrier and good biocompatibility, the hydroxylated single-walled carbon nanotube (SWCNT-OH) has been shown with excellent anti-amyloid properties. Here, we systematically studied the SWCNT-OH effects on the fibrillization of the β2m21-31 peptides utilizing all-atom discrete molecular dynamics (DMD) simulation. Our results demonstrated the isolated β2m21-31 peptides first nucleated into unstructured oligomers followed by coil-to-sheet conformational conversions in oligomers with at least six peptides. The elongation and lateral surfaces of the preformed β-sheet could catalyze the other unstructured monomers and small oligomers converted into β-sheet formations via dock-lock fibril growth and secondary nucleation processes. Eventually, the β2m21-31 peptides would self-assemble into well-ordered cross-β structures. Regardless of isolated monomers or well-defined cross-β assemblies, the β2m21-31 would attach on the surfaces of SWCNT-OH adopting unstructured formations indicating the SWCNT-OH not only inhibited the fibrillization of β2m21-31 but also destroyed pre-formed proto-fibrils. Overall, our study displays a complete picture of the fibrillization mechanism of β2m21-31 and the amyloid inhibitory mechanism of SWCNT-OH, offering new insight into the de-novo design of anti-amyloid inhibitors.
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Affiliation(s)
- Yu Zhang
- School of Physical Science and Technology, Ningbo University, Ningbo 315211, China
| | - Yuying Liu
- School of Physical Science and Technology, Ningbo University, Ningbo 315211, China
| | - Wenhui Zhao
- School of Physical Science and Technology, Ningbo University, Ningbo 315211, China
| | - Yunxiang Sun
- School of Physical Science and Technology, Ningbo University, Ningbo 315211, China.
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Abstract
Polyphenolic compounds are thought to show considerable promise for the treatment of various metabolic disorders, including type 2 diabetes mellitus (T2DM). This review addresses evidence from in vitro, in vivo, and clinical studies for the antidiabetic effects of certain polyphenolic compounds. We focus on the role of cytotoxic human amylin (hA) aggregates in the pathogenesis of T2DM, and how polyphenols can ameliorate this process by suppressing or modifying their formation. Small, soluble amylin oligomers elicit cytotoxicity in pancreatic islet β-cells and may thus cause β-cell disruption in T2DM. Amylin oligomers may also contribute to oxidative stress and inflammation that lead to the triggering of β-cell apoptosis. Polyphenols may exert antidiabetic effects via their ability to inhibit hA aggregation, and to modulate oxidative stress, inflammation, and other pathways that are β-cell-protective or insulin-sensitizing. There is evidence that their ability to inhibit and destabilize self-assembly by hA requires aromatic molecular structures that bind to misfolding monomers or oligomers, coupled with adjacent hydroxyl groups present on single phenyl rings. Thus, these multifunctional compounds have the potential to be effective against the pleiotropic mechanisms of T2DM. However, substantial further research will be required before it can be determined whether a polyphenol-based molecular entity can be used as a therapeutic for type 2 diabetes.
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Affiliation(s)
- Tina Nie
- School of Biological Sciences, Faculty of Science, the University of Auckland, Auckland, New Zealand
| | - Garth J. S. Cooper
- School of Biological Sciences, Faculty of Science, the University of Auckland, Auckland, New Zealand
- The Maurice Wilkins Centre for Molecular Biodiscovery, Faculty of Science, the University of Auckland, Auckland, New Zealand
- Centre for Advanced Discovery and Experimental Therapeutics, Division of Cardiovascular Sciences, Faculty of Biology Medicine & Health, School of Medical Sciences, The University of Manchester, Manchester, United Kingdom
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Niyangoda C, Barton J, Bushra N, Karunarathne K, Strauss G, Fakhre F, Koria P, Muschol M. Origin, toxicity and characteristics of two amyloid oligomer polymorphs. RSC Chem Biol 2021; 2:1631-1642. [PMID: 34977578 PMCID: PMC8637835 DOI: 10.1039/d1cb00081k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Accepted: 08/18/2021] [Indexed: 11/25/2022] Open
Abstract
There is compelling evidence that small oligomeric aggregates, emerging during the assembly of amyloid fibrils and plaques, are important molecular pathogens in many amyloid diseases. While significant progress has been made in revealing the mechanisms underlying fibril growth, understanding how amyloid oligomers fit into the fibril assembly process, and how they contribute to the pathogenesis of amyloid diseases, has remained elusive. Commonly, amyloid oligomers are considered to be metastable, early-stage precursors to fibril formation that are either on- or off-pathway from fibril growth. In addition, amyloid oligomers have been reported to colocalize with late-stage fibrils and plaques. Whether these early and late-stage oligomer species are identical or distinct, and whether both are relevant to pathogenesis remains unclear. Here we report on the formation of two distinct oligomer species of lysozyme, formed either during the early or late-stages of in vitro fibril growth. We further observe that the pH change from in vitro growth conditions to cell media used for toxicity studies induced distinct mesoscopic precipitates, two of which resemble either diffuse or neuritic plaques seen in Alzheimer's histology. Our biophysical characterization indicates that both oligomer species share morphological and tinctorial features considered characteristic for amyloid oligomers. At the same time, their sizes, morphologies, their immunostaining, detailed tinctorial profiles and, most prominently, their biological activity are clearly distinct from each other. Probing the conditions promoting the formation of these two distinct oligomer species suggests distinct roles of charge interactions, hydrophobicity and monomer flexibility in directing oligomer assembly.
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Affiliation(s)
| | - Jeremy Barton
- Dept. of Physics, University of South Florida Tampa FL 33620 USA
| | - Nabila Bushra
- Dept. of Physics, University of South Florida Tampa FL 33620 USA
| | | | - Graham Strauss
- Dept. of Chemical and Biomedical Engineering, University of South Florida Tampa FL 33620 USA
| | - Fadia Fakhre
- Dept. of Physics, University of South Florida Tampa FL 33620 USA
| | - Piyush Koria
- Dept. of Chemical and Biomedical Engineering, University of South Florida Tampa FL 33620 USA
| | - Martin Muschol
- Dept. of Physics, University of South Florida Tampa FL 33620 USA
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44
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Rodriguez Camargo DC, Chia S, Menzies J, Mannini B, Meisl G, Lundqvist M, Pohl C, Bernfur K, Lattanzi V, Habchi J, Cohen SI, Knowles TPJ, Vendruscolo M, Linse S. Surface-Catalyzed Secondary Nucleation Dominates the Generation of Toxic IAPP Aggregates. Front Mol Biosci 2021; 8:757425. [PMID: 34790701 PMCID: PMC8591229 DOI: 10.3389/fmolb.2021.757425] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Accepted: 10/12/2021] [Indexed: 01/22/2023] Open
Abstract
The aggregation of the human islet amyloid polypeptide (IAPP) is associated with diabetes type II. A quantitative understanding of this connection at the molecular level requires that the aggregation mechanism of IAPP is resolved in terms of the underlying microscopic steps. Here we have systematically studied recombinant IAPP, with amidated C-terminus in oxidised form with a disulphide bond between residues 3 and 7, using thioflavin T fluorescence to monitor the formation of amyloid fibrils as a function of time and IAPP concentration. We used global kinetic analyses to connect the macroscopic measurements of aggregation to the microscopic mechanisms, and show that the generation of new aggregates is dominated by the secondary nucleation of monomers on the fibril surface. We then exposed insulinoma cells to aliquots extracted from different time points of the aggregation process, finding the highest toxicity at the midpoint of the reaction, when the secondary nucleation rate reaches its maximum. These results identify IAPP oligomers as the most cytotoxic species generated during IAPP aggregation, and suggest that compounds that target secondary nucleation of IAPP could be most effective as therapeutic candidates for diabetes type II.
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Affiliation(s)
- Diana C Rodriguez Camargo
- Department of Biochemistry and Structural Biology, Lund University, Lund, Sweden.,Wren Therapeutics Limited, Clarendon House, Cambridge, United Kingdom
| | - Sean Chia
- Wren Therapeutics Limited, Clarendon House, Cambridge, United Kingdom.,Centre for Misfolding Diseases, Yusuf Hamied Department of Chemistry, University of Cambridge, Cambridge, United Kingdom
| | - Joseph Menzies
- Wren Therapeutics Limited, Clarendon House, Cambridge, United Kingdom
| | - Benedetta Mannini
- Wren Therapeutics Limited, Clarendon House, Cambridge, United Kingdom.,Centre for Misfolding Diseases, Yusuf Hamied Department of Chemistry, University of Cambridge, Cambridge, United Kingdom
| | - Georg Meisl
- Centre for Misfolding Diseases, Yusuf Hamied Department of Chemistry, University of Cambridge, Cambridge, United Kingdom
| | - Martin Lundqvist
- Department of Biochemistry and Structural Biology, Lund University, Lund, Sweden
| | - Christin Pohl
- Department of Biochemistry and Structural Biology, Lund University, Lund, Sweden
| | - Katja Bernfur
- Department of Biochemistry and Structural Biology, Lund University, Lund, Sweden
| | - Veronica Lattanzi
- Department of Biochemistry and Structural Biology, Lund University, Lund, Sweden
| | - Johnny Habchi
- Wren Therapeutics Limited, Clarendon House, Cambridge, United Kingdom.,Centre for Misfolding Diseases, Yusuf Hamied Department of Chemistry, University of Cambridge, Cambridge, United Kingdom
| | - Samuel Ia Cohen
- Wren Therapeutics Limited, Clarendon House, Cambridge, United Kingdom
| | - Tuomas P J Knowles
- Centre for Misfolding Diseases, Yusuf Hamied Department of Chemistry, University of Cambridge, Cambridge, United Kingdom.,Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom
| | - Michele Vendruscolo
- Centre for Misfolding Diseases, Yusuf Hamied Department of Chemistry, University of Cambridge, Cambridge, United Kingdom
| | - Sara Linse
- Department of Biochemistry and Structural Biology, Lund University, Lund, Sweden
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45
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Pathak BK, Dey S, Mozumder S, Sengupta J. The role of membranes in function and dysfunction of intrinsically disordered amyloidogenic proteins. Adv Protein Chem Struct Biol 2021; 128:397-434. [PMID: 35034725 DOI: 10.1016/bs.apcsb.2021.08.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Membrane-protein interactions play a major role in human physiology as well as in diseases pathology. Interaction of a protein with the membrane was previously thought to be dependent on well-defined three-dimensional structure of the protein. In recent decades, however, it has become evident that a large fraction of the proteome, particularly in eukaryotes, stays disordered in solution and these proteins are termed as intrinsically disordered proteins (IDPs). Also, a vast majority of human proteomes have been reported to contain substantially long disordered regions, called intrinsically disordered regions (IDRs), in addition to the structurally ordered regions. IDPs exist in an ensemble of conformations and the conformational flexibility enables IDPs to achieve functional diversity. IDPs (and IDRs) are found to be important players in cell signaling, where biological membranes act as anchors for signaling cascades. Therefore, IDPs modulate the membrane architectures, at the same time membrane composition also affects the binding of IDPs. Because of intrinsic disorders, misfolding of IDPs often leads to formation of oligomers, protofibrils and mature fibrils through progressive self-association. Accumulation of amyloid-like aggregates of some of the IDPs is a known causative agent for numerous diseases. In this chapter we highlight recent advances in understanding membrane interactions of some of the intrinsically disordered proteins involved in the pathogenesis of human diseases.
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Affiliation(s)
- Bani Kumar Pathak
- Structural Biology and Bioinformatics Division, CSIR-Indian Institute of Chemical Biology, Jadavpur, Kolkata, India
| | - Sandip Dey
- Structural Biology and Bioinformatics Division, CSIR-Indian Institute of Chemical Biology, Jadavpur, Kolkata, India
| | - Sukanya Mozumder
- Structural Biology and Bioinformatics Division, CSIR-Indian Institute of Chemical Biology, Jadavpur, Kolkata, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India
| | - Jayati Sengupta
- Structural Biology and Bioinformatics Division, CSIR-Indian Institute of Chemical Biology, Jadavpur, Kolkata, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India.
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46
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Marmentini C, Branco RCS, Boschero AC, Kurauti MA. Islet amyloid toxicity: From genesis to counteracting mechanisms. J Cell Physiol 2021; 237:1119-1142. [PMID: 34636428 DOI: 10.1002/jcp.30600] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2021] [Revised: 09/09/2021] [Accepted: 10/01/2021] [Indexed: 11/11/2022]
Abstract
Islet amyloid polypeptide (IAPP or amylin) is a hormone co-secreted with insulin by pancreatic β-cells and is the major component of islet amyloid. Islet amyloid is found in the pancreas of patients with type 2 diabetes (T2D) and may be involved in β-cell dysfunction and death, observed in this disease. Thus, investigating the aspects related to amyloid formation is relevant to the development of strategies towards β-cell protection. In this sense, IAPP misprocessing, IAPP overproduction, and disturbances in intra- and extracellular environments seem to be decisive for IAPP to form islet amyloid. Islet amyloid toxicity in β-cells may be triggered in intra- and/or extracellular sites by membrane damage, endoplasmic reticulum stress, autophagy disruption, mitochondrial dysfunction, inflammation, and apoptosis. Importantly, different approaches have been suggested to prevent islet amyloid cytotoxicity, from inhibition of IAPP aggregation to attenuation of cell death mechanisms. Such approaches have improved β-cell function and prevented the development of hyperglycemia in animals. Therefore, counteracting islet amyloid may be a promising therapy for T2D treatment.
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Affiliation(s)
- Carine Marmentini
- Laboratory of Endocrine Pancreas and Metabolism, Obesity and Comorbidities Research Center (OCRC), University of Campinas (UNICAMP), Campinas, Brazil
| | - Renato C S Branco
- Laboratory of Endocrine Pancreas and Metabolism, Obesity and Comorbidities Research Center (OCRC), University of Campinas (UNICAMP), Campinas, Brazil
| | - Antonio C Boschero
- Laboratory of Endocrine Pancreas and Metabolism, Obesity and Comorbidities Research Center (OCRC), University of Campinas (UNICAMP), Campinas, Brazil
| | - Mirian A Kurauti
- Laboratory of Endocrine Pancreas and Metabolism, Obesity and Comorbidities Research Center (OCRC), University of Campinas (UNICAMP), Campinas, Brazil.,Department of Physiological Sciences, Biological Sciences Center, State University of Maringa (UEM), Maringa, Brazil
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47
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Lesma J, Bizet F, Berardet C, Tonali N, Pellegrino S, Taverna M, Khemtemourian L, Soulier JL, van Heijenoort C, Halgand F, Ha-Duong T, Kaffy J, Ongeri S. β-Hairpin Peptide Mimics Decrease Human Islet Amyloid Polypeptide (hIAPP) Aggregation. Front Cell Dev Biol 2021; 9:729001. [PMID: 34604227 PMCID: PMC8481668 DOI: 10.3389/fcell.2021.729001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Accepted: 08/23/2021] [Indexed: 11/17/2022] Open
Abstract
Amyloid diseases are degenerative pathologies, highly prevalent today because they are closely related to aging, that have in common the erroneous folding of intrinsically disordered proteins (IDPs) which aggregate and lead to cell death. Type 2 Diabetes involves a peptide called human islet amyloid polypeptide (hIAPP), which undergoes a conformational change, triggering the aggregation process leading to amyloid aggregates and fibers rich in β-sheets mainly found in the pancreas of all diabetic patients. Inhibiting the aggregation of amyloid proteins has emerged as a relevant therapeutic approach and we have recently developed the design of acyclic flexible hairpins based on peptidic recognition sequences of the amyloid β peptide (Aβ1–42) as a successful strategy to inhibit its aggregation involved in Alzheimer’s disease. The present work reports the extension of our strategy to hIAPP aggregation inhibitors. The design, synthesis, conformational analyses, and biophysical evaluations of dynamic β-hairpin like structures built on a piperidine-pyrrolidine β-turn inducer are described. By linking to this β-turn inducer three different arms (i) pentapeptide, (ii) tripeptide, and (iii) α/aza/aza/pseudotripeptide, we demonstrate that the careful selection of the peptide-based arms from the sequence of hIAPP allowed to selectively modulate its aggregation, while the peptide character can be decreased. Biophysical assays combining, Thioflavin-T fluorescence, transmission electronic microscopy, capillary electrophoresis, and mass spectrometry showed that the designed compounds inhibit both the oligomerization and the fibrillization of hIAPP. They are also capable to decrease the aggregation process in the presence of membrane models and to strongly delay the membrane-leakage induced by hIAPP. More generally, this work provides the proof of concept that our rational design is a versatile and relevant strategy for developing efficient and selective inhibitors of aggregation of amyloidogenic proteins.
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Affiliation(s)
- Jacopo Lesma
- BioCIS, CNRS, Université Paris-Saclay, Châtenay-Malabry, France
| | - Faustine Bizet
- BioCIS, CNRS, Université Paris-Saclay, Châtenay-Malabry, France
| | - Corentin Berardet
- BioCIS, CNRS, Université Paris-Saclay, Châtenay-Malabry, France.,Institute Galien Paris-Saclay, CNRS, Université Paris-Saclay, Châtenay-Malabry, France
| | - Nicolo Tonali
- BioCIS, CNRS, Université Paris-Saclay, Châtenay-Malabry, France
| | - Sara Pellegrino
- DISFARM, Sezione di Chimica Generale e Organica "A. Marchesini," Università degli Studi di Milano, Milan, Italy
| | - Myriam Taverna
- Institute Galien Paris-Saclay, CNRS, Université Paris-Saclay, Châtenay-Malabry, France
| | - Lucie Khemtemourian
- Institute of Chemistry and Biology of Membranes and Nanoobjects, Institut Polytechnique Bordeaux, CNRS UMR 5248, Université de Bordeaux, Pessac, France
| | | | - Carine van Heijenoort
- ICSN, Equipe Biologie et Chimie Structurales, Département de Chimie et Biologie Structurales et Analytiques, CNRS, Université Paris-Saclay, Gif-sur-Yvette, France
| | - Frédéric Halgand
- Institut de Chimie Physique, Equipe Chimie Analytique Physicochimie Réactivité des Ions, CNRS, Université Paris-Saclay, Orsay, France
| | - Tâp Ha-Duong
- BioCIS, CNRS, Université Paris-Saclay, Châtenay-Malabry, France
| | - Julia Kaffy
- BioCIS, CNRS, Université Paris-Saclay, Châtenay-Malabry, France
| | - Sandrine Ongeri
- BioCIS, CNRS, Université Paris-Saclay, Châtenay-Malabry, France
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48
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Abstract
Islet amyloid polypeptide (IAPP, also known as amylin) is a peptide hormone that is co-secreted with insulin by pancreatic β-cells and forms amyloid aggregates in type II diabetes. Various lines of evidence indicate that oligomers of this peptide may induce toxicity by disrupting or forming pores in cell membranes, but the structure of these pores is unknown. Here, we create models of pores for both helical and β-structured peptides using implicit membrane modeling and test their stability using multimicrosecond all-atom simulations. We find that the helical peptides behave similarly to antimicrobial peptides; they remain stably inserted in a highly tilted or partially unfolded configuration creating a narrow water channel. Parallel helix orientation creates a somewhat larger pore. An octameric β barrel of parallel β-hairpins is highly stable in the membrane, whereas the corresponding barrel made of antiparallel hairpins is not. We propose that certain experiments probe the helical pore state while others probe the β-structured pore state; this provides a possible explanation for lack of correlation that is sometimes observed between in vivo toxicity and in vitro liposome permeabilization experiments.
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Affiliation(s)
- Aliasghar Sepehri
- Department of Chemistry, City College of New York, New York, New York 10031, United States
| | - Binod Nepal
- Department of Chemistry, City College of New York, New York, New York 10031, United States
| | - Themis Lazaridis
- Department of Chemistry, City College of New York, New York, New York 10031, United States.,Graduate Programs in Chemistry, Biochemistry, and Physics, The Graduate Center, City University of New York, New York, New York, New York 10016, United States
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49
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Nguyen PT, Zottig X, Sebastiao M, Arnold AA, Marcotte I, Bourgault S. Identification of transmissible proteotoxic oligomer-like fibrils that expand conformational diversity of amyloid assemblies. Commun Biol 2021; 4:939. [PMID: 34354242 DOI: 10.1038/s42003-021-02466-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Accepted: 07/19/2021] [Indexed: 11/08/2022] Open
Abstract
Protein misfolding and amyloid deposition are associated with numerous diseases. The detailed characterization of the proteospecies mediating cell death remains elusive owing to the (supra)structural polymorphism and transient nature of the assemblies populating the amyloid pathway. Here we describe the identification of toxic amyloid fibrils with oligomer-like characteristics, which were assembled from an islet amyloid polypeptide (IAPP) derivative containing an Asn-to-Gln substitution (N21Q). While N21Q filaments share structural properties with cytocompatible fibrils, including the 4.7 Å inter-strand distance and β-sheet-rich conformation, they concurrently display characteristics of oligomers, such as low thioflavin-T binding, high surface hydrophobicity and recognition by the A11 antibody, leading to high potency to disrupt membranes and cause cellular dysfunction. The toxic oligomer-like conformation of N21Q fibrils, which is preserved upon elongation, is transmissible to naïve IAPP. These stable fibrils expanding the conformational diversity of amyloid assemblies represent an opportunity to elucidate the structural basis of amyloid disorders. Nguyen et al identified cytotoxic amyloid fibrils with oligomer-like characteristics, which were assembled from an islet amyloid polypeptide (IAPP) derivative containing an Asn-to-Gln substitution (N21Q). They presented evidence to show that these stable fibrils expand the conformational diversity of amyloid assemblies, which represents an opportunity to elucidate the structural basis of amyloid disorders.
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50
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Kang T, Huang H, Mandrup-Poulsen T, Larsen MR. Divalent Metal Transporter 1 Knock-Down Modulates IL-1β Mediated Pancreatic Beta-Cell Pro-Apoptotic Signaling Pathways through the Autophagic Machinery. Int J Mol Sci 2021; 22:8013. [PMID: 34360779 DOI: 10.3390/ijms22158013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Revised: 07/23/2021] [Accepted: 07/24/2021] [Indexed: 12/21/2022] Open
Abstract
Pro-inflammatory cytokines promote cellular iron-import through enhanced divalent metal transporter-1 (DMT1) expression in pancreatic β-cells, consequently cell death. Inhibition of β-cell iron-import by DMT1 silencing protects against apoptosis in animal models of diabetes. However, how alterations of signaling networks contribute to the protective action of DMT1 knock-down is unknown. Here, we performed phosphoproteomics using our sequential enrichment strategy of mRNA, protein, and phosphopeptides, which enabled us to explore the concurrent molecular events in the same set of wildtype and DMT1-silenced β-cells during IL-1β exposure. Our findings reveal new phosphosites in the IL-1β-induced proteins that are clearly reverted by DMT1 silencing towards their steady-state levels. We validated the levels of five novel phosphosites of the potential protective proteins using parallel reaction monitoring. We also confirmed the inactivation of autophagic flux that may be relevant for cell survival induced by DMT1 silencing during IL-1β exposure. Additionally, the potential protective proteins induced by DMT1 silencing were related to insulin secretion that may lead to improving β-cell functions upon exposure to IL-1β. This global profiling has shed light on the signal transduction pathways driving the protection against inflammation-induced cell death in β-cells after DMT1 silencing.
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