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Qiang W, Kengewerere MK, Kenyaga JM. Modulation of Lipid Dynamics in the β-Amyloid Aggregates Induced Membrane Fragmentation. J Phys Chem B 2024; 128:5667-5675. [PMID: 38836448 DOI: 10.1021/acs.jpcb.4c02119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2024]
Abstract
Nonspecific membrane disruption is considered a plausible mechanism for the cytotoxicity induced by β-amyloid (Aβ) aggregates. In scenarios of high local Aβ concentrations, a two-step membrane fragmentation model has been proposed. Initially, membrane-embedded Aβ oligomeric aggregates form, followed by membrane fragmentation. However, the key molecular-level interactions between Aβ oligomeric aggregates and lipids that drive the second-stage membrane fragmentation remain unclear. This study monitors the time-dependent changes in lipid dynamics and water accessibility of model liposomes during Aβ-induced membrane fragmentation. Our results indicate that lipid dynamics on the nanosecond to microsecond time scale undergo rapid acceleration upon initial incubation with membrane-incorporated Aβ oligomeric aggregates, followed by a slow deceleration process. Concurrently, lipid headgroups become less accessible to water. Both observations suggest a carpet-like mechanism of membrane disruption for the Aβ-induced membrane fragmentation process.
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Affiliation(s)
- Wei Qiang
- Department of Chemistry, Binghamton University, State University of New York, Binghamton, New York 13902, United States
| | - Maurine K Kengewerere
- Department of Chemistry, Binghamton University, State University of New York, Binghamton, New York 13902, United States
| | - June M Kenyaga
- Department of Chemistry, Binghamton University, State University of New York, Binghamton, New York 13902, United States
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Iizuka Y, Katano-Toki A, Hayashi F, Fujioka J, Takahashi H, Nakamura K. Exogenous polyserine fibrils change membrane properties of phosphatidylcholine-liposome and red blood cells. BIOCHIMICA ET BIOPHYSICA ACTA. BIOMEMBRANES 2024; 1866:184331. [PMID: 38718958 DOI: 10.1016/j.bbamem.2024.184331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Revised: 03/29/2024] [Accepted: 04/29/2024] [Indexed: 05/12/2024]
Abstract
The causative genes for neurodegenerative polyglutamine (polyQ) diseases produce homopolymeric polyglutamine (polyQ), polyserine (polyS), polyalanine (polyA), polycysteine (polyC), and polyleucine (polyL) sequences by repeat-associated non-AUG (RAN) translation. The cytotoxicity of the intracellular polyQ and RAN products has been extensively investigated. However, little is known about the toxicity of the extracellular polyQ and RAN products on the membranes of viable cells. Because polyQ aggregates induce a deflated morphology of a model membrane, we hypothesized that extracellular polyQ and RAN products might affect the membrane properties of viable cells. In this study, we demonstrated that exogenous polyS fibrils but not polyS or polyQ non-fibril aggregates altered the thermal phase transition behavior of a model membrane composed of a phosphatidylcholine bilayer using differential scanning calorimetry. PolyS fibrils induced morphological changes in viable red blood cells (RBCs). However, both polyS and polyQ non-fibril aggregates had no effects on RBCs. These results highlight the possibility that extracellular fibrils generated from RAN products may alter the properties of neuronal cell membranes, which may contribute to changes in the brain pathology.
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Affiliation(s)
- Yutaro Iizuka
- Department of Laboratory Sciences, Gunma University Graduate School of Health Sciences, 3-39-22, Showa-machi, Maebashi, Gunma 371-8511, Japan
| | - Akiko Katano-Toki
- Department of Laboratory Sciences, Gunma University Graduate School of Health Sciences, 3-39-22, Showa-machi, Maebashi, Gunma 371-8511, Japan
| | - Fumio Hayashi
- Center for Instrumental Analysis, Organization for Promotion of Research and University Industry Collaboration, Gunma University, 1-5-1, Tenjin-cho, Kiryu, Gunma, 376-8515, Japan
| | - Jun Fujioka
- Department of Chemistry, Faculty of Science Division I, Tokyo University of Science, 1-3, Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
| | - Hiroshi Takahashi
- Biophysics Laboratory, Division of Pure and Applied Science, Graduate School of Science and Technology, Gunma University, 4-2, Aramaki, Maebashi, Gunma 371-8510, Japan.
| | - Kazuhiro Nakamura
- Department of Laboratory Sciences, Gunma University Graduate School of Health Sciences, 3-39-22, Showa-machi, Maebashi, Gunma 371-8511, Japan.
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Kenyaga JM, Oteino SA, Sun Y, Qiang W. In-cell 31P solid-state NMR measurements of the lipid dynamics and influence of exogeneous β-amyloid peptides on live neuroblastoma neuro-2a cells. Biophys Chem 2023; 297:107008. [PMID: 36989875 DOI: 10.1016/j.bpc.2023.107008] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 03/18/2023] [Accepted: 03/19/2023] [Indexed: 03/29/2023]
Abstract
Non-specific disruption of cellular membranes induced by aggregation of exogeneous β-amyloid (Aβ) peptides is considered a viable pathological mechanism in Alzheimer's disease (AD). The solid-state nuclear magnetic resonance (ssNMR) spectroscopy has been widely applied in model liposomes to provide important insights on the molecular interactions between membranes and Aβ aggregates. Yet, the feasibility of in-cell ssNMR spectroscopy to probe Aβ-membrane interactions in native cellular environments has rarely been tested. Here we report the application of in-cell31P ssNMR spectroscopy on live mouse neuroblastoma Neuro-2a (N2a) cells under moderate magic angle spinning (MAS) conditions. Both cell viability and cytoplasmic membrane integrity are retained for up to six hours under 5 kHz MAS frequency at 277 K, which allow applications of direct-polarization 31P spectroscopy and 31P spin-spin (T2) relaxation measurements. The 31P T2 relaxation time constant of N2a cells is significantly increased compared with the model liposome prepared with comparable major phospholipid compositions. With the addition of 5 μM 40-residue Aβ (Aβ1-40) peptides, the 31P T2 relaxation is instantly accelerated. This work demonstrates the feasibility of using in-cell31P ssNMR to investigate the Aβ-membrane interactions in the biologically relevant cellular system.
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Król S, Österlund N, Vosough F, Jarvet J, Wärmländer S, Barth A, Ilag LL, Magzoub M, Gräslund A, Mörman C. The amyloid-inhibiting NCAM-PrP peptide targets Aβ peptide aggregation in membrane-mimetic environments. iScience 2021; 24:102852. [PMID: 34381976 PMCID: PMC8340127 DOI: 10.1016/j.isci.2021.102852] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 05/27/2021] [Accepted: 07/09/2021] [Indexed: 01/16/2023] Open
Abstract
Substantial research efforts have gone into elucidating the role of protein misfolding and self-assembly in the onset and progression of Alzheimer's disease (AD). Aggregation of the Amyloid-β (Aβ) peptide into insoluble fibrils is closely associated with AD. Here, we use biophysical techniques to study a peptide-based approach to target Aβ amyloid aggregation. A peptide construct, NCAM-PrP, consists of a largely hydrophobic signal sequence linked to a positively charged hexapeptide. The NCAM-PrP peptide inhibits Aβ amyloid formation by forming aggregates which are unavailable for further amyloid aggregation. In a membrane-mimetic environment, Aβ and NCAM-PrP form specific heterooligomeric complexes, which are of lower aggregation states compared to Aβ homooligomers. The Aβ:NCAM-PrP interaction appears to take place on different aggregation states depending on the absence or presence of a membrane-mimicking environment. These insights can be useful for the development of potential future therapeutic strategies targeting Aβ at several aggregation states.
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Affiliation(s)
- Sylwia Król
- Department of Biochemistry and Biophysics, Stockholm University, Stockholm, 106 91, Sweden
| | - Nicklas Österlund
- Department of Biochemistry and Biophysics, Stockholm University, Stockholm, 106 91, Sweden
| | - Faraz Vosough
- Department of Biochemistry and Biophysics, Stockholm University, Stockholm, 106 91, Sweden
| | - Jüri Jarvet
- Department of Biochemistry and Biophysics, Stockholm University, Stockholm, 106 91, Sweden
| | - Sebastian Wärmländer
- Department of Biochemistry and Biophysics, Stockholm University, Stockholm, 106 91, Sweden
| | - Andreas Barth
- Department of Biochemistry and Biophysics, Stockholm University, Stockholm, 106 91, Sweden
| | - Leopold L. Ilag
- Department of Materials and Environmental Chemistry, Stockholm University, Stockholm, 106 91, Sweden
| | - Mazin Magzoub
- Biology Program, Division of Science, New York University Abu Dhabi, Box 129188, Abu Dhabi, United Arab Emirates
| | - Astrid Gräslund
- Department of Biochemistry and Biophysics, Stockholm University, Stockholm, 106 91, Sweden
| | - Cecilia Mörman
- Department of Biochemistry and Biophysics, Stockholm University, Stockholm, 106 91, Sweden
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Shi JM, Zhu L, Lan X, Zhao DW, He YJ, Sun ZQ, Wu D, Li HY. Endocytosis Is a Key Mode of Interaction between Extracellular β-Amyloid and the Cell Membrane. Biophys J 2020; 119:1078-1090. [PMID: 32857960 PMCID: PMC7499104 DOI: 10.1016/j.bpj.2020.07.035] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Revised: 06/21/2020] [Accepted: 07/08/2020] [Indexed: 11/23/2022] Open
Abstract
Interactions between amyloid-β peptide (Aβ) and the cell membrane include interaction with membrane lipids and binding to membrane receptors, both of which are considered to be the toxicity mechanisms of Aβ. However, it is unclear whether both mechanisms lead to cytotoxicity. Thus, we aimed to analyze these two mechanisms of Aβ42 interaction with cell membranes under different Aβ aggregation states. To this end, model membrane experiments were conducted. Quantitative analysis of Aβ42 monomers or oligomers bound to the membrane of neuro-2a cells was also performed, and laser confocal microscopy was employed to assess endocytosis of FITC-Aβ42 monomers or oligomers by neuro-2a cells. We found that the binding capacity of Aβ42 to membrane lipids was weak and that the amount of Aβ42 bound to membrane lipids was low. Moreover, clathrin-mediated endocytosis of Aβ42 oligomers by neuro-2a cells was observed. Endocytosis serves as a key mode of interaction between extracellular Aβ42 and neurons. These findings provide insights into the mechanisms underlying Aβ oligomer metabolism.
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Affiliation(s)
- Jing-Ming Shi
- School of Medicine, Xizang Minzu University, Xian' yang, Shaanxi, P.R. China
| | - Li Zhu
- School of Life Sciences, Lanzhou University, Lanzhou, P.R. China
| | - Xi Lan
- MOE Key Laboratory of Environment and Genes Related to Diseases, School of Basic Medical Sciences, Xi'an Jiaotong University, Xi'an, Shaanxi, P. R. China
| | - Duan-Wei Zhao
- Gansu Provincial Institute of Drug Control, Lanzhou, P.R. China
| | - Yong-Jun He
- School of Medicine, Xizang Minzu University, Xian' yang, Shaanxi, P.R. China
| | - Zheng-Qi Sun
- School of Medicine, Xizang Minzu University, Xian' yang, Shaanxi, P.R. China
| | - Di Wu
- School of Life Sciences, Lanzhou University, Lanzhou, P.R. China
| | - Hai-Yun Li
- MOE Key Laboratory of Environment and Genes Related to Diseases, School of Basic Medical Sciences, Xi'an Jiaotong University, Xi'an, Shaanxi, P. R. China.
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Prima GD, Librizzi F, Carrotta R. Light Scattering as an Easy Tool to Measure Vesicles Weight Concentration. MEMBRANES 2020; 10:E222. [PMID: 32899344 PMCID: PMC7558410 DOI: 10.3390/membranes10090222] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Revised: 08/28/2020] [Accepted: 09/01/2020] [Indexed: 01/22/2023]
Abstract
Over the last few decades, liposomes have emerged as promising drug delivery systems and effective membrane models for studying biophysical and biological processes. For all applications, knowing their concentration after preparation is crucial. Thus, the development of methods for easily controlling vesicles concentration would be of great utility. A new assay is presented here, based on a suitable analysis of light scattering intensity from liposome dispersions. The method, tested for extrusion preparations, is precise, easy, fast, non-destructive and uses a tiny amount of sample. Furthermore, the scattering intensity can be measured indifferently at different angles, or even by using the elastic band obtained from a standard spectrofluorimeter. To validate the method, the measured concentrations of vesicles of different matrix compositions and sizes, measured by light scattering with different angles and instruments, were compared to the data obtained by the standard Stewart assay. Consistent results were obtained. The light scattering assay is based on the assessment of the mass fraction lost in the preparation, and can be applied for methods such as extrusion, homogenization, French press and other microfluidic procedures.
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Affiliation(s)
- Giulia Di Prima
- Institute of Biophysics, National Research Council, Via Ugo La Malfa 153, 90146 Palermo, Italy; (G.D.P.); (F.L.)
- Dipartimento di Scienze e Tecnologie Biologiche Chimiche e Farmaceutiche (STEBICEF), University of Palermo, Via Archirafi 32, 90123 Palermo, Italy
| | - Fabio Librizzi
- Institute of Biophysics, National Research Council, Via Ugo La Malfa 153, 90146 Palermo, Italy; (G.D.P.); (F.L.)
| | - Rita Carrotta
- Institute of Biophysics, National Research Council, Via Ugo La Malfa 153, 90146 Palermo, Italy; (G.D.P.); (F.L.)
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