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Ridolfi A, Cardellini J, Gashi F, van Herwijnen MJC, Trulsson M, Campos-Terán J, H M Wauben M, Berti D, Nylander T, Stenhammar J. Electrostatic interactions control the adsorption of extracellular vesicles onto supported lipid bilayers. J Colloid Interface Sci 2023; 650:883-891. [PMID: 37450977 DOI: 10.1016/j.jcis.2023.07.018] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Revised: 06/26/2023] [Accepted: 07/05/2023] [Indexed: 07/18/2023]
Abstract
Communication between cells located in different parts of an organism is often mediated by membrane-enveloped nanoparticles, such as extracellular vesicles (EVs). EV binding and cell uptake mechanisms depend on the heterogeneous composition of the EV membrane. From a colloidal perspective, the EV membrane interacts with other biological interfaces via both specific and non-specific interactions, where the latter include long-ranged electrostatic and van der Waals forces, and short-ranged repulsive "steric-hydration" forces. While electrostatic forces are generally exploited in most EV immobilization protocols, the roles played by various colloidal forces in controlling EV adsorption on surfaces have not yet been thoroughly addressed. In the present work, we study the adsorption of EVs onto supported lipid bilayers (SLBs) carrying different surface charge densities using a combination of quartz crystal microbalance with dissipation monitoring (QCM-D) and confocal laser scanning microscopy (CLSM). We demonstrate that EV adsorption onto lipid membranes can be controlled by varying the strength of electrostatic forces and we theoretically describe the observed phenomena within the framework of nonlinear Poisson-Boltzmann theory. Our modelling results confirm the experimental observations and highlight the crucial role played by attractive electrostatics in EV adsorption onto lipid membranes. They furthermore show that simplified theories developed for model lipid systems can be successfully applied to the study of their biological analogues and provide new fundamental insights into EV-membrane interactions with potential use in developing novel EV separation and immobilization strategies.
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Affiliation(s)
- Andrea Ridolfi
- Department of Physics and Astronomy and LaserLaB Amsterdam, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands; Department of Chemistry "Ugo Schiff", University of Florence, Florence, Italy.
| | - Jacopo Cardellini
- Department of Chemistry "Ugo Schiff", University of Florence, Florence, Italy; CSGI, Consorzio Sistemi a Grande Interfase, University of Florence, Sesto Fiorentino, Italy
| | - Fatlinda Gashi
- Division of Physical Chemistry, Lund University, Lund, Sweden
| | - Martijn J C van Herwijnen
- Department of Biomolecular Health Sciences, Faculty of Veterinary Medicine, Utrecht University, Utrecht, the Netherlands
| | - Martin Trulsson
- Division of Computational Chemistry, Lund University, Lund, Sweden
| | - José Campos-Terán
- Departamento de Procesos y Tecnología, Universidad Autónoma Metropolitana-Cuajimalpa, México City, Mexico; LINXS - Institute of Advanced Neutron and X-ray Science, Lund, Sweden
| | - Marca H M Wauben
- Department of Biomolecular Health Sciences, Faculty of Veterinary Medicine, Utrecht University, Utrecht, the Netherlands
| | - Debora Berti
- Department of Chemistry "Ugo Schiff", University of Florence, Florence, Italy; CSGI, Consorzio Sistemi a Grande Interfase, University of Florence, Sesto Fiorentino, Italy
| | - Tommy Nylander
- Division of Physical Chemistry, Lund University, Lund, Sweden; LINXS - Institute of Advanced Neutron and X-ray Science, Lund, Sweden; NanoLund, Lund University, Lund, Sweden
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2
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Shin S, Tae H, Park S, Cho NJ. Lipid Membrane Remodeling by the Micellar Aggregation of Long-Chain Unsaturated Fatty Acids for Sustainable Antimicrobial Strategies. Int J Mol Sci 2023; 24:ijms24119639. [PMID: 37298587 DOI: 10.3390/ijms24119639] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 05/26/2023] [Accepted: 05/31/2023] [Indexed: 06/12/2023] Open
Abstract
Antimicrobial fatty acids derived from natural sources and renewable feedstocks are promising surface-active substances with a wide range of applications. Their ability to target bacterial membrane in multiple mechanisms offers a promising antimicrobial approach for combating bacterial infections and preventing the development of drug-resistant strains, and it provides a sustainable strategy that aligns with growing environmental awareness compared to their synthetic counterparts. However, the interaction and destabilization of bacterial cell membranes by these amphiphilic compounds are not yet fully understood. Here, we investigated the concentration-dependent and time-dependent membrane interaction between long-chain unsaturated fatty acids-linolenic acid (LNA, C18:3), linoleic (LLA, C18:2), and oleic acid (OA, C18:1)-and the supported lipid bilayers (SLBs) using quartz crystal microbalance-dissipation (QCM-D) and fluorescence microscopy. We first determined the critical micelle concentration (CMC) of each compound using a fluorescence spectrophotometer and monitored the membrane interaction in real time following fatty acid treatment, whereby all micellar fatty acids elicited membrane-active behavior primarily above their respective CMC values. Specifically, LNA and LLA, which have higher degrees of unsaturation and CMC values of 160 µM and 60 µM, respectively, caused significant changes in the membrane with net |Δf| shifts of 23.2 ± 0.8 Hz and 21.4 ± 0.6 Hz and ΔD shifts of 5.2 ± 0.5 × 10-6 and 7.4 ± 0.5 × 10-6. On the other hand, OA, with the lowest unsaturation degree and CMC value of 20 µM, produced relatively less membrane change with a net |Δf| shift of 14.6 ± 2.2 Hz and ΔD shift of 8.8 ± 0.2 × 10-6. Both LNA and LLA required higher concentrations than OA to initiate membrane remodeling as their CMC values increased with the degree of unsaturation. Upon incubating with fluorescence-labeled model membranes, the fatty acids induced tubular morphological changes at concentrations above CMC. Taken together, our findings highlight the critical role of self-aggregation properties and the degree of unsaturated bonds in unsaturated long-chain fatty acids upon modulating membrane destabilization, suggesting potential applications in developing sustainable and effective antimicrobial strategies.
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Affiliation(s)
- Sungmin Shin
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Hyunhyuk Tae
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Soohyun Park
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Nam-Joon Cho
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
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3
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Shin S, Ko H, Kim CH, Yoon BK, Son S, Lee JA, Shin JM, Lee J, Song SH, Jackman JA, Park JH. Curvature-sensing peptide inhibits tumour-derived exosomes for enhanced cancer immunotherapy. NATURE MATERIALS 2023; 22:656-665. [PMID: 36959501 DOI: 10.1038/s41563-023-01515-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2021] [Accepted: 02/21/2023] [Indexed: 05/05/2023]
Abstract
Tumour-derived exosomes (T-EXOs) impede immune checkpoint blockade therapies, motivating pharmacological efforts to inhibit them. Inspired by how antiviral curvature-sensing peptides disrupt membrane-enveloped virus particles in the exosome size range, we devised a broadly useful strategy that repurposes an engineered antiviral peptide to disrupt membrane-enveloped T-EXOs for synergistic cancer immunotherapy. The membrane-targeting peptide inhibits T-EXOs from various cancer types and exhibits pH-enhanced membrane disruption relevant to the tumour microenvironment. The combination of T-EXO-disrupting peptide and programmed cell death protein-1 antibody-based immune checkpoint blockade therapy improves treatment outcomes in tumour-bearing mice. Peptide-mediated disruption of T-EXOs not only reduces levels of circulating exosomal programmed death-ligand 1, but also restores CD8+ T cell effector function, prevents premetastatic niche formation and reshapes the tumour microenvironment in vivo. Our findings demonstrate that peptide-induced T-EXO depletion can enhance cancer immunotherapy and support the potential of peptide engineering for exosome-targeting applications.
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Affiliation(s)
- Sol Shin
- Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, Republic of Korea
| | - Hyewon Ko
- Bionanotechnology Research Center, Korea Research Institute of Bioscience & Biotechnology, Daejeon, Republic of Korea
- School of Pharmacy, Sungkyunkwan University, Suwon, Republic of Korea
| | - Chan Ho Kim
- School of Chemical Engineering, College of Engineering, Sungkyunkwan University, Suwon, Republic of Korea
| | - Bo Kyeong Yoon
- School of Chemical Engineering, College of Engineering, Sungkyunkwan University, Suwon, Republic of Korea
- Translational Nanobioscience Research Center, Sungkyunkwan University, Suwon, Republic of Korea
- Biomedical Institute for Convergence at SKKU, Sungkyunkwan University, Suwon, Republic of Korea
- School of Healthcare and Biomedical Engineering, Chonnam National University, Yeosu, Republic of Korea
| | - Soyoung Son
- School of Chemical Engineering, College of Engineering, Sungkyunkwan University, Suwon, Republic of Korea
| | - Jae Ah Lee
- School of Chemical Engineering, College of Engineering, Sungkyunkwan University, Suwon, Republic of Korea
| | - Jung Min Shin
- Division of Biotechnology, Convergence Research Institute, DGIST, Daegu, Republic of Korea
| | - Jeongjin Lee
- Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, Republic of Korea
| | - Seok Ho Song
- School of Chemical Engineering, College of Engineering, Sungkyunkwan University, Suwon, Republic of Korea
| | - Joshua A Jackman
- School of Chemical Engineering, College of Engineering, Sungkyunkwan University, Suwon, Republic of Korea.
- Translational Nanobioscience Research Center, Sungkyunkwan University, Suwon, Republic of Korea.
- Biomedical Institute for Convergence at SKKU, Sungkyunkwan University, Suwon, Republic of Korea.
| | - Jae Hyung Park
- Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, Republic of Korea.
- School of Chemical Engineering, College of Engineering, Sungkyunkwan University, Suwon, Republic of Korea.
- Biomedical Institute for Convergence at SKKU, Sungkyunkwan University, Suwon, Republic of Korea.
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4
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Lee S, Chung M. DNA-Tethered Lipid Membrane Formation via Solvent-Assisted Self-Assembly. J Phys Chem B 2023; 127:1350-1356. [PMID: 36733188 DOI: 10.1021/acs.jpcb.2c07978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
DNA-tethered lipid bilayers have been used in many studies, based on the controllable and well-defined properties of DNA tethers. However, their application has been limited, because it is difficult to cover a wide range of surfaces and achieve electrical insulation. We implemented an existing method, where a DNA hybrid chip on a silica or glass surface supports a lipid membrane using solvent-assisted self-assembly. The formation of a continuous lipid bilayer was confirmed through the change in quartz crystal microbalance dissipation results, depending on the presence or absence of DNA hybrids. The fluidity of the DNA-tethered lipid membranes was analyzed using a fluorescence microscope. The electrochemical analysis demonstrated the versatility of this new technique, which can be used for sensor or electrode surface modification for biosensors or bioelectronics.
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Affiliation(s)
- Sangmin Lee
- Department of Chemical Engineering, Hongik University, Mapo-gu, Seoul 04066, Republic of Korea
| | - Minsub Chung
- Department of Chemical Engineering, Hongik University, Mapo-gu, Seoul 04066, Republic of Korea
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5
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Biophysical Characterization of LTX-315 Anticancer Peptide Interactions with Model Membrane Platforms: Effect of Membrane Surface Charge. Int J Mol Sci 2022; 23:ijms231810558. [PMID: 36142470 PMCID: PMC9501188 DOI: 10.3390/ijms231810558] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2022] [Revised: 09/06/2022] [Accepted: 09/08/2022] [Indexed: 11/16/2022] Open
Abstract
LTX-315 is a clinical-stage, anticancer peptide therapeutic that disrupts cancer cell membranes. Existing mechanistic knowledge about LTX-315 has been obtained from cell-based biological assays, and there is an outstanding need to directly characterize the corresponding membrane-peptide interactions from a biophysical perspective. Herein, we investigated the membrane-disruptive properties of the LTX-315 peptide using three cell-membrane-mimicking membrane platforms on solid supports, namely the supported lipid bilayer, intact vesicle adlayer, and tethered lipid bilayer, in combination with quartz crystal microbalance-dissipation (QCM-D) and electrochemical impedance spectroscopy (EIS) measurements. The results showed that the cationic LTX-315 peptide selectively disrupted negatively charged phospholipid membranes to a greater extent than zwitterionic or positively charged phospholipid membranes, whereby electrostatic interactions were the main factor to influence peptide attachment and membrane curvature was a secondary factor. Of note, the EIS measurements showed that the LTX-315 peptide extensively and irreversibly permeabilized negatively charged, tethered lipid bilayers that contained high phosphatidylserine lipid levels representative of the outer leaflet of cancer cell membranes, while circular dichroism (CD) spectroscopy experiments indicated that the LTX-315 peptide was structureless and the corresponding membrane-disruptive interactions did not involve peptide conformational changes. Dynamic light scattering (DLS) measurements further verified that the LTX-315 peptide selectively caused irreversible disruption of negatively charged lipid vesicles. Together, our findings demonstrate that the LTX-315 peptide preferentially disrupts negatively charged phospholipid membranes in an irreversible manner, which reinforces its potential as an emerging cancer immunotherapy and offers a biophysical framework to guide future peptide engineering efforts.
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6
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Ma GJ, Yoon BK, Sut TN, Yoo KY, Lee SH, Jeon W, Jackman JA, Ariga K, Cho N. Lipid coating technology: A potential solution to address the problem of sticky containers and vanishing drugs. VIEW 2022. [DOI: 10.1002/viw.20200078] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Affiliation(s)
- Gamaliel Junren Ma
- School of Materials Science and Engineering Nanyang Technological University Nanyang Singapore
| | - Bo Kyeong Yoon
- School of Chemical Engineering and Biomedical Institute for Convergence at SKKU (BICS) Sungkyunkwan University Suwon Republic of Korea
| | - Tun Naw Sut
- School of Materials Science and Engineering Nanyang Technological University Nanyang Singapore
- School of Chemical Engineering and Biomedical Institute for Convergence at SKKU (BICS) Sungkyunkwan University Suwon Republic of Korea
| | - Ki Yeol Yoo
- LUCA Health and LUCA AICell, Inc. Anyang Republic of Korea
| | - Seung Hwa Lee
- LUCA Health and LUCA AICell, Inc. Anyang Republic of Korea
| | - Won‐Yong Jeon
- School of Chemical Engineering and Biomedical Institute for Convergence at SKKU (BICS) Sungkyunkwan University Suwon Republic of Korea
| | - Joshua A. Jackman
- School of Chemical Engineering and Biomedical Institute for Convergence at SKKU (BICS) Sungkyunkwan University Suwon Republic of Korea
| | - Katsuhiko Ariga
- WPI‐MANA National Institute for Materials Science (NIMS) Tsukuba Ibaraki Japan
- Department of Advanced Materials Science, Graduate School of Frontier Sciences The University of Tokyo Kashiwa Chiba Japan
| | - Nam‐Joon Cho
- School of Materials Science and Engineering Nanyang Technological University Nanyang Singapore
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7
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Andrews JT, Baker KE, Handloser JT, Bridges N, Krone AA, Kett PJN. Formation of Supported Lipid Bilayers (SLBs) from Buffers Containing Low Concentrations of Group I Chloride Salts. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:12819-12833. [PMID: 34699227 DOI: 10.1021/acs.langmuir.1c01707] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Supported lipid bilayers (SLBs) are a useful tool for studying the interactions between lipids and other biomolecules that make up a cell membrane. SLBs are typically formed by the adsorption and rupture of vesicles from solution. Although it is known that many experimental factors can affect whether SLB formation is successful, there is no comprehensive understanding of the mechanism. In this work, we have used a quartz crystal microbalance (QCM) to investigate the role of the salt in the buffer on the formation of phosphatidylcholine SLBs on a silicon dioxide (SiO2) surface. We varied the concentration of sodium chloride in the buffer, from 5 to 150 mM, to find the minimum concentration of NaCl that was required for the successful formation of an SLB. We then repeated the experiments with other group I chloride salts (LiCl, KCl, and CsCl) and found that at higher salt concentrations (150 mM) SLB formation was successful for all of the salts used, and the degree of deformation of the adsorbed vesicles at the critical vesicle coverage was cation-dependent. The results showed that at an intermediate salt concentration (50 mM) the critical vesicle coverage was cation-dependent and at low salt concentrations (12.5 mM) the cation used determined whether SLB formation was successful. We found that the successful formation of SLBs could occur at lower electrolyte concentrations for KCl and CsCl than it did for NaCl. To understand these results, we calculated the magnitude of the vesicle-surface interaction energy using the Derjaguin-Landau-Verwey-Overbeek (DLVO) and extended-DLVO theory. We managed to explain the results obtained at higher salt concentrations by including cation-dependent surface potentials in the calculations and at lower salt concentrations by the addition of a cation-dependent hydration force. These results showed that the way that different cations in solution affect the 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC)-SiO2 surface interaction energy depends on the ionic strength of the solution.
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Affiliation(s)
- J Tucker Andrews
- Department of Chemistry, Hendrix College, 1600 Washington Avenue, Conway, Arkansas 72032, United States
| | - Kirstyn E Baker
- Department of Chemistry, Hendrix College, 1600 Washington Avenue, Conway, Arkansas 72032, United States
| | - Jacob T Handloser
- Department of Chemistry, Hendrix College, 1600 Washington Avenue, Conway, Arkansas 72032, United States
| | - Natalie Bridges
- Department of Chemistry, Hendrix College, 1600 Washington Avenue, Conway, Arkansas 72032, United States
| | - Alexis A Krone
- Department of Chemistry, Hendrix College, 1600 Washington Avenue, Conway, Arkansas 72032, United States
| | - Peter J N Kett
- Department of Chemistry, Hendrix College, 1600 Washington Avenue, Conway, Arkansas 72032, United States
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8
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Peng Z, Shimba K, Miyamoto Y, Yagi T. A Study of the Effects of Plasma Surface Treatment on Lipid Bilayers Self-Spreading on a Polydimethylsiloxane Substrate under Different Treatment Times. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:10732-10740. [PMID: 34464138 DOI: 10.1021/acs.langmuir.1c01319] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Plasma-treated poly(dimethylsiloxane) (PDMS)-supported lipid bilayers are used as functional tools for studying cell membrane properties and as platforms for biotechnology applications. Self-spreading is a versatile method for forming lipid bilayers. However, few studies have focused on the effect of plasma treatment on self-spreading lipid bilayer formation. In this paper, we performed lipid bilayer self-spreading on a PDMS surface with different treatment times. Surface characterization of PDMS treated with different treatment times is evaluated by AFM and SEM, and the effects of plasma treatment of the PDMS surface on lipid bilayer self-spreading behavior is investigated by confocal microscopy. The front-edge velocity of lipid bilayers increases with the plasma treatment time. By theoretical analyses with the extended-DLVO modeling, we find that the most likely cause of the velocity change is the hydration repulsion energy between the PDMS surface and lipid bilayers. Moreover, the growth behavior of membrane lobes on the underlying self-spreading lipid bilayer was affected by topography changes in the PDMS surface resulting from plasma treatment. Our findings suggest that the growth of self-spreading lipid bilayers can be controlled by changing the plasma treatment time.
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Affiliation(s)
- Zugui Peng
- School of Engineering, Tokyo Institute of Technology, 403, Ishikawadai Bldg. 3, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550 Japan
| | - Kenta Shimba
- School of Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Yoshitaka Miyamoto
- School of Engineering, Tokyo Institute of Technology, 403, Ishikawadai Bldg. 3, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550 Japan
- Department of Reproductive Biology, National Center for Child Health and Development, 2-10-1 Okura, Setagaya-ku, Tokyo 157-8535, Japan
| | - Tohru Yagi
- School of Engineering, Tokyo Institute of Technology, 403, Ishikawadai Bldg. 3, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550 Japan
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9
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Versatile formation of supported lipid bilayers from bicellar mixtures of phospholipids and capric acid. Sci Rep 2020; 10:13849. [PMID: 32796898 PMCID: PMC7427796 DOI: 10.1038/s41598-020-70872-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Accepted: 07/29/2020] [Indexed: 01/07/2023] Open
Abstract
Originally developed for the structural biology field, lipid bicelle nanostructures composed of long- and short-chain phospholipid molecules have emerged as a useful interfacial science tool to fabricate two-dimensional supported lipid bilayers (SLBs) on hydrophilic surfaces due to ease of sample preparation, scalability, and versatility. To improve SLB fabrication prospects, there has been recent interest in replacing the synthetic, short-chain phospholipid component of bicellar mixtures with naturally abundant fatty acids and monoglycerides, i.e., lauric acid and monocaprin. Such options have proven successful under specific conditions, however, there is room for devising more versatile fabrication options, especially in terms of overcoming lipid concentration-dependent SLB formation limitations. Herein, we investigated SLB fabrication by using bicellar mixtures consisting of long-chain phospholipid and capric acid, the latter of which has similar headgroup and chain length properties to lauric acid and monocaprin, respectively. Quartz crystal microbalance-dissipation, epifluorescence microscopy, and fluorescence recovery after photobleaching experiments were conducted to characterize lipid concentration-dependent bicelle adsorption onto silicon dioxide surfaces. We identified that uniform-phase SLB formation occurred independently of total lipid concentration when the ratio of long-chain phospholipid to capric acid molecules ("q-ratio") was 0.25 or 2.5, which is superior to past results with lauric acid- and monocaprin-containing bicelles in which cases lipid concentration-dependent behavior was observed. Together, these findings demonstrate that capric acid-containing bicelles are versatile tools for SLB fabrication and highlight how the molecular structure of bicelle components can be rationally finetuned to modulate self-assembly processes at solid-liquid interfaces.
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10
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Ferhan AR, Yoon BK, Jeon WY, Cho NJ. Biologically interfaced nanoplasmonic sensors. NANOSCALE ADVANCES 2020; 2:3103-3114. [PMID: 36134263 PMCID: PMC9418064 DOI: 10.1039/d0na00279h] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Accepted: 06/26/2020] [Indexed: 05/30/2023]
Abstract
Understanding biointerfacial processes is crucial in various fields across fundamental and applied biology, but performing quantitative studies via conventional characterization techniques remains challenging due to instrumentation as well as analytical complexities and limitations. In order to accelerate translational research and address current challenges in healthcare and medicine, there is an outstanding need to develop surface-sensitive technologies with advanced measurement capabilities. Along this line, nanoplasmonic sensing has emerged as a powerful tool to quantitatively study biointerfacial processes owing to its high spatial resolution at the nanoscale. Consequently, the development of robust biological interfacing strategies becomes imperative to maximize its characterization potential. This review will highlight and discuss the critical role of biological interfacing within the context of constructing nanoplasmonic sensing platforms for biointerfacial science applications. Apart from paving the way for the development of highly surface-sensitive characterization tools that will spur fundamental biological interaction studies and improve the overall understanding of biological processes, the basic principles behind biointerfacing strategies presented in this review are also applicable to other fields that involve an interface between an inorganic material and a biological system.
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Affiliation(s)
- Abdul Rahim Ferhan
- School of Materials Science and Engineering, Nanyang Technological University 50 Nanyang Avenue 639798 Singapore
| | - Bo Kyeong Yoon
- School of Materials Science and Engineering, Nanyang Technological University 50 Nanyang Avenue 639798 Singapore
- School of Chemical Engineering, Sungkyunkwan University Suwon 16419 Republic of Korea
| | - Won-Yong Jeon
- School of Chemical Engineering, Sungkyunkwan University Suwon 16419 Republic of Korea
| | - Nam-Joon Cho
- School of Materials Science and Engineering, Nanyang Technological University 50 Nanyang Avenue 639798 Singapore
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11
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Bailey-Hytholt CM, Puranik T, Tripathi A, Shukla A. Investigating interactions of phthalate environmental toxicants with lipid structures. Colloids Surf B Biointerfaces 2020; 190:110923. [DOI: 10.1016/j.colsurfb.2020.110923] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2019] [Revised: 02/24/2020] [Accepted: 03/01/2020] [Indexed: 11/29/2022]
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12
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Sut TN, Park S, Yoon BK, Jackman JA, Cho NJ. Supported Lipid Bilayer Formation from Phospholipid-Fatty Acid Bicellar Mixtures. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:5021-5029. [PMID: 32308002 DOI: 10.1021/acs.langmuir.0c00675] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Supported lipid bilayers (SLBs) are versatile cell membrane-mimicking biointerfaces for various applications such as biosensors and drug delivery systems, and there is broad interest in developing simple, cost-effective methods to achieve SLB fabrication. One promising approach involves the deposition of quasi-two-dimensional bicelle nanostructures that are composed of long-chain phospholipids and either short-chain phospholipids or detergent molecules. While a variety of long-chain phospholipids have been used to prepare bicelles for SLB fabrication applications, only two short-chain phospholipids, 1,2-dihexanoyl-sn-glycero-3-phosphocholine and 1,2-diheptanoyl-sn-glycero-3-phosphocholine (collectively referred to as DHPC), have been investigated. There remains an outstanding need to identify natural alternatives to DHPC, especially ones that are more affordable, to improve fabrication prospects and application opportunities. Herein, we explored the potential to fabricate SLBs from bicellar mixtures composed of long-chain phospholipids and lauric acid (LA), which is a low-cost, naturally abundant fatty acid that is widely used in soapmaking and various industrial applications. Quartz crystal microbalance-dissipation (QCM-D) experiments were conducted to track bicelle adsorption onto silica surfaces as a function of bicelle composition and lipid concentration, along with time-lapse fluorescence microscopy imaging and fluorescence recovery after photobleaching (FRAP) experiments to further characterize lipid adlayer properties. The results identified optimal conditions where it is possible to efficiently form SLBs from LA-containing bicelles at low lipid concentrations while also unraveling mechanistic insights into the bicelle-mediated SLB formation process and verifying that LA-containing bicelles are biocompatible with human cells for surface coating applications.
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Affiliation(s)
- Tun Naw Sut
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore
- School of Chemical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Soohyun Park
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore
| | - Bo Kyeong Yoon
- School of Chemical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Joshua A Jackman
- School of Chemical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Nam-Joon Cho
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore
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13
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Jackman JA, Cho NJ. Supported Lipid Bilayer Formation: Beyond Vesicle Fusion. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:1387-1400. [PMID: 31990559 DOI: 10.1021/acs.langmuir.9b03706] [Citation(s) in RCA: 70] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Supported lipid bilayers (SLBs) are cell-membrane-mimicking platforms that can be formed on solid surfaces and integrated with a wide range of surface-sensitive measurement techniques. SLBs are useful for unravelling details of fundamental membrane biology and biophysics as well as for various medical, biotechnology, and environmental science applications. Thus, there is high interest in developing simple and robust methods to fabricate SLBs. Currently, vesicle fusion is a popular method to form SLBs and involves the adsorption and spontaneous rupture of lipid vesicles on a solid surface. However, successful vesicle fusion depends on high-quality vesicle preparation, and it typically works with a narrow range of material supports and lipid compositions. In this Feature Article, we summarize current progress in developing two new SLB fabrication techniques termed the solvent-assisted lipid bilayer (SALB) and bicelle methods, which have compelling advantages such as simple sample preparation and compatibility with a wide range of material supports and lipid compositions. The molecular self-assembly principles underpinning the two strategies and important experimental parameters are critically discussed, and recent application examples are presented. Looking forward, we envision that these emerging SLB fabrication strategies can be widely adopted by specialists and nonspecialists alike, paving the way to enriching our understanding of lipid membrane properties and realizing new application possibilities.
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Affiliation(s)
- Joshua A Jackman
- School of Chemical Engineering , Sungkyunkwan University , Suwon 16419 , Republic of Korea
| | - Nam-Joon Cho
- School of Materials Science and Engineering , Nanyang Technological University , 50 Nanyang Avenue , Singapore 639798 , Singapore
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14
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Yorulmaz Avsar S, Kyropoulou M, Di Leone S, Schoenenberger CA, Meier WP, Palivan CG. Biomolecules Turn Self-Assembling Amphiphilic Block Co-polymer Platforms Into Biomimetic Interfaces. Front Chem 2019; 6:645. [PMID: 30671429 PMCID: PMC6331732 DOI: 10.3389/fchem.2018.00645] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Accepted: 12/11/2018] [Indexed: 12/29/2022] Open
Abstract
Biological membranes constitute an interface between cells and their surroundings and form distinct compartments within the cell. They also host a variety of biomolecules that carry out vital functions including selective transport, signal transduction and cell-cell communication. Due to the vast complexity and versatility of the different membranes, there is a critical need for simplified and specific model membrane platforms to explore the behaviors of individual biomolecules while preserving their intrinsic function. Information obtained from model membrane platforms should make invaluable contributions to current and emerging technologies in biotechnology, nanotechnology and medicine. Amphiphilic block co-polymers are ideal building blocks to create model membrane platforms with enhanced stability and robustness. They form various supramolecular assemblies, ranging from three-dimensional structures (e.g., micelles, nanoparticles, or vesicles) in aqueous solution to planar polymer membranes on solid supports (e.g., polymer cushioned/tethered membranes,) and membrane-like polymer brushes. Furthermore, polymer micelles and polymersomes can also be immobilized on solid supports to take advantage of a wide range of surface sensitive analytical tools. In this review article, we focus on self-assembled amphiphilic block copolymer platforms that are hosting biomolecules. We present different strategies for harnessing polymer platforms with biomolecules either by integrating proteins or peptides into assemblies or by attaching proteins or DNA to their surface. We will discuss how to obtain synthetic structures on solid supports and their characterization using different surface sensitive analytical tools. Finally, we highlight present and future perspectives of polymer micelles and polymersomes for biomedical applications and those of solid-supported polymer membranes for biosensing.
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15
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Maekawa T, Chin H, Nyu T, Sut TN, Ferhan AR, Hayashi T, Cho NJ. Molecular diffusion and nano-mechanical properties of multi-phase supported lipid bilayers. Phys Chem Chem Phys 2019; 21:16686-16693. [DOI: 10.1039/c9cp02085c] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Understanding the properties of cell membranes is important in the fields of fundamental and applied biology.
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Affiliation(s)
- Tatsuhiro Maekawa
- Department of Materials Science and Engineering
- School of Materials Chemical Technology
- Tokyo Institute of Technology
- Yokohama
- Japan
| | - Hokyun Chin
- School of Materials Science and Engineering
- Nanyang Technological University
- Singapore
| | - Takashi Nyu
- Department of Materials Science and Engineering
- School of Materials Chemical Technology
- Tokyo Institute of Technology
- Yokohama
- Japan
| | - Tun Naw Sut
- School of Materials Science and Engineering
- Nanyang Technological University
- Singapore
| | - Abdul Rahim Ferhan
- School of Materials Science and Engineering
- Nanyang Technological University
- Singapore
| | - Tomohiro Hayashi
- Department of Materials Science and Engineering
- School of Materials Chemical Technology
- Tokyo Institute of Technology
- Yokohama
- Japan
| | - Nam-Joon Cho
- School of Materials Science and Engineering
- Nanyang Technological University
- Singapore
- School of Chemical and Biomedical Engineering
- Nanyang Technological University
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16
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Determination of pH Effects on Phosphatidyl-Hydroxytyrosol and Phosphatidyl-Tyrosol Bilayer Behavior. Methods Protoc 2018; 1:mps1040041. [PMID: 31164581 PMCID: PMC6481071 DOI: 10.3390/mps1040041] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Revised: 11/02/2018] [Accepted: 11/06/2018] [Indexed: 11/18/2022] Open
Abstract
A robust method was developed to investigate the liposomal behavior of novel enzymatically-synthesized hydroxytyrosol and tyrosol phospholipids. Bilayer characteristic obtained by this method, including bilayer formation stability and adsorption properties, were explored using dynamic light scattering, zeta-potential measurements, and quartz crystal microbalance with dissipation monitoring (QCMD), respectively. Liposome diameters were found to typically increase from pH 5.5 to pH 10. Zeta potentials values, on the other hand, were found to be well below −25 mV at all pH conditions explored, with the lowest values (and thus, the best liposome stability) at pH 5.5 or pH 10. Quartz crystal microbalance with dissipation monitoring measurements demonstrated that 100% 1,2-dioloeoylphosphatidyl-hydroxytyrosol (DOPHT) liposomes adsorbed intact onto silica in buffer conditions at pH 5.5 and with no calcium, or at pH 7.5 with calcium (no adsorption was detected at pH 10). 1,2-Dioleoylphosphatidyl-tyrosol (DOPT) liposomes were shown to adsorb intact under buffer conditions only at pH 5.5 with and without calcium. 1,2-Dioleoylphosphatidyl-2-phenolethanol (DOPPE), in comparison, readily adsorbed intact at pH 7.5 without calcium and just slightly at pH 5.5 with calcium present, but formed a supported bilayer over hours at pH 5.5 in the absence of calcium ions.
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Jackman JA, Costa VV, Park S, Real ALCV, Park JH, Cardozo PL, Ferhan AR, Olmo IG, Moreira TP, Bambirra JL, Queiroz VF, Queiroz-Junior CM, Foureaux G, Souza DG, Ribeiro FM, Yoon BK, Wynendaele E, De Spiegeleer B, Teixeira MM, Cho NJ. Therapeutic treatment of Zika virus infection using a brain-penetrating antiviral peptide. NATURE MATERIALS 2018; 17:971-977. [PMID: 30349030 DOI: 10.1038/s41563-018-0194-2] [Citation(s) in RCA: 63] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Accepted: 09/11/2018] [Indexed: 05/22/2023]
Abstract
Zika virus is a mosquito-borne virus that is associated with neurodegenerative diseases, including Guillain-Barré syndrome1 and congenital Zika syndrome2. As Zika virus targets the nervous system, there is an urgent need to develop therapeutic strategies that inhibit Zika virus infection in the brain. Here, we have engineered a brain-penetrating peptide that works against Zika virus and other mosquito-borne viruses. We evaluated the therapeutic efficacy of the peptide in a lethal Zika virus mouse model exhibiting systemic and brain infection. Therapeutic treatment protected against mortality and markedly reduced clinical symptoms, viral loads and neuroinflammation, as well as mitigated microgliosis, neurodegeneration and brain damage. In addition to controlling systemic infection, the peptide crossed the blood-brain barrier to reduce viral loads in the brain and protected against Zika-virus-induced blood-brain barrier injury. Our findings demonstrate how engineering strategies can be applied to develop peptide therapeutics and support the potential of a brain-penetrating peptide to treat neurotropic viral infections.
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Affiliation(s)
- Joshua A Jackman
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore
| | - Vivian V Costa
- Immunopharmacology Lab, Department of Biochemistry and Immunology, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Minas Gerais, Brazil
- Center for Drug Research and Development of Pharmaceuticals, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Minas Gerais, Brazil
- Research Group in Arboviral Diseases, Department of Morphology, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Minas Gerais, Brazil
| | - Soohyun Park
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore
| | - Ana Luiza C V Real
- Neurobiochemistry Lab, Department of Biochemistry and Immunology, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Minas Gerais, Brazil
| | - Jae Hyeon Park
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore
| | - Pablo L Cardozo
- Neurobiochemistry Lab, Department of Biochemistry and Immunology, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Minas Gerais, Brazil
| | - Abdul Rahim Ferhan
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore
| | - Isabella G Olmo
- Neurobiochemistry Lab, Department of Biochemistry and Immunology, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Minas Gerais, Brazil
| | - Thaiane P Moreira
- Research Group in Arboviral Diseases, Department of Morphology, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Minas Gerais, Brazil
- Host-Interaction Microorganism Lab, Department of Microbiology, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Jordana L Bambirra
- Research Group in Arboviral Diseases, Department of Morphology, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Minas Gerais, Brazil
- Host-Interaction Microorganism Lab, Department of Microbiology, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Victoria F Queiroz
- Research Group in Arboviral Diseases, Department of Morphology, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Minas Gerais, Brazil
- Host-Interaction Microorganism Lab, Department of Microbiology, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Celso M Queiroz-Junior
- Cardiac Biology Lab, Department of Morphology, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Giselle Foureaux
- Cardiac Biology Lab, Department of Morphology, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Danielle G Souza
- Host-Interaction Microorganism Lab, Department of Microbiology, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Fabiola M Ribeiro
- Neurobiochemistry Lab, Department of Biochemistry and Immunology, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Minas Gerais, Brazil
| | - Bo Kyeong Yoon
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore
| | - Evelien Wynendaele
- Drug Quality and Registration Group, Faculty of Pharmaceutical Sciences, Ghent University, Ghent, Belgium
| | - Bart De Spiegeleer
- Drug Quality and Registration Group, Faculty of Pharmaceutical Sciences, Ghent University, Ghent, Belgium
| | - Mauro M Teixeira
- Immunopharmacology Lab, Department of Biochemistry and Immunology, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Minas Gerais, Brazil
- Center for Drug Research and Development of Pharmaceuticals, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Minas Gerais, Brazil
| | - Nam-Joon Cho
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore.
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, Singapore.
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18
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Ariga K, Jackman JA, Cho NJ, Hsu SH, Shrestha LK, Mori T, Takeya J. Nanoarchitectonic-Based Material Platforms for Environmental and Bioprocessing Applications. CHEM REC 2018; 19:1891-1912. [PMID: 30230688 DOI: 10.1002/tcr.201800103] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2018] [Accepted: 08/30/2018] [Indexed: 12/11/2022]
Abstract
The challenges of pollution, environmental science, and energy consumption have become global issues of broad societal importance. In order to address these challenges, novel functional systems and advanced materials are needed to achieve high efficiency, low emission, and environmentally friendly performance. A promising approach involves nanostructure-level controls of functional material design through a novel concept, nanoarchitectonics. In this account article, we summarize nanoarchitectonic approaches to create nanoscale platform structures that are potentially useful for environmentally green and bioprocessing applications. The introduced platforms are roughly classified into (i) membrane platforms and (ii) nanostructured platforms. The examples are discussed together with the relevant chemical processes, environmental sensing, bio-related interaction analyses, materials for environmental remediation, non-precious metal catalysts, and facile separation for biomedical uses.
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Affiliation(s)
- Katsuhiko Ariga
- WPI Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan.,Graduate School of Frontier Sciences, The University of Tokyo 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8561, Japan
| | - Joshua A Jackman
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, 637553, Singapore.,Department of Medicine, Stanford University Stanford, California, 94305, USA
| | - Nam-Joon Cho
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, 637553, Singapore.,School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, 637459, Singapore
| | - Shan-Hui Hsu
- Institute of Polymer Science and Engineering, National Taiwan University, No. 1, Sec. 4 Roosevelt Road, Taipei, 10617, Taiwan, R.O.C
| | - Lok Kumar Shrestha
- WPI Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan
| | - Taizo Mori
- WPI Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan.,Graduate School of Frontier Sciences, The University of Tokyo 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8561, Japan
| | - Jun Takeya
- Graduate School of Frontier Sciences, The University of Tokyo 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8561, Japan
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19
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Ferhan AR, Jackman JA, Cho NJ. Investigating how vesicle size influences vesicle adsorption on titanium oxide: a competition between steric packing and shape deformation. Phys Chem Chem Phys 2018; 19:2131-2139. [PMID: 28045148 DOI: 10.1039/c6cp07930j] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Understanding the adsorption behavior of lipid vesicles at solid-liquid interfaces is important for obtaining fundamental insights into soft matter adsorbates as well as for practical applications such as supported lipid bilayer (SLB) fabrication. While the process of SLB formation has been highly scrutinized, less understood are the details of vesicle adsorption without rupture, especially at high surface coverages. Herein, we tackle this problem by employing simultaneous quartz crystal microbalance-dissipation (QCM-D) and localized surface plasmon resonance (LSPR) measurements in order to investigate the effect of vesicle size (84-211 nm diameter) on vesicle adsorption onto a titanium oxide surface. Owing to fundamental differences in the measurement principles of the two techniques as well as a mismatch in probing volumes, it was possible to determine both the lipid mass adsorbed near the sensor surface as well as the total mass of adsorbed lipid and hydrodynamically coupled solvent in the adsorbed vesicle layer as a whole. With increasing vesicle size, the QCM-D frequency signal exhibited monotonic behavior reaching an asymptotic value, whereas the QCM-D energy dissipation signal continued to increase according to the vesicle size. In marked contrast, the LSPR-tracked lipid mass near the sensor surface followed a parabolic trend, with the greatest corresponding measurement response occurring for intermediate-size vesicles. The findings reveal that the maximum extent of adsorbed vesicles contacting a solid surface occurs at an intermediate vesicle size due to the competing influences of vesicle deformation and steric packing. Looking forward, such information can be applied to control the molecular self-assembly of phospholipid assemblies as well as provide the basis for investigating deformable, soft matter adsorbates.
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Affiliation(s)
- Abdul Rahim Ferhan
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue 639798, Singapore.
| | - Joshua A Jackman
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue 639798, Singapore.
| | - Nam-Joon Cho
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue 639798, Singapore. and School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive 637459, Singapore
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20
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Chilambi GS, Gao IH, Yoon BK, Park S, Kawakami LM, Ravikumar V, Chan-Park MB, Cho NJ, Bazan GC, Kline KA, Rice SA, Hinks J. Membrane adaptation limitations inEnterococcus faecalisunderlie sensitivity and the inability to develop significant resistance to conjugated oligoelectrolytes. RSC Adv 2018; 8:10284-10293. [PMID: 35540442 PMCID: PMC9078823 DOI: 10.1039/c7ra11823f] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Accepted: 03/01/2018] [Indexed: 11/21/2022] Open
Abstract
COEs are emerging antimicrobials to combat drug resistant infections and to which bacteria develop only limited resistance.
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21
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Bailey CM, Tripathi A, Shukla A. Effects of Flow and Bulk Vesicle Concentration on Supported Lipid Bilayer Formation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:11986-11997. [PMID: 28949544 DOI: 10.1021/acs.langmuir.7b02764] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Supported lipid bilayers (SLBs) have been used extensively in a variety of biotechnology applications and fundamental studies exploring lipid behavior. Despite their widespread use, various physicochemical parameters have yet to be thoroughly investigated for their impact on SLB formation. In this work, we have studied the importance of flow in inducing the rupture of surface adsorbed chicken egg-derived l-α-phosphatidylcholine (egg PC) vesicles on silica and gold surfaces via quartz crystal microbalance with dissipation monitoring (QCM-D). On silica at 25 °C, egg PC vesicles were found to adsorb in a flattened configuration (∼13 nm thick, compared to bulk vesicle diameters of ∼165 nm) but only undergo a transition to a stable SLB under flow conditions. In the absence of flow, an increase in system temperature to 37 °C was able to promote vesicle rupture and SLB formation on silica with a 10 times lower rupture time, compared to rupture under continuous flow (175 μL/min flow rate). Gold surfaces, with their increased hydrophobicity, led to less vesicle flattening once adsorbed (structures ∼60 nm thick), and did not support vesicle rupture or SLB formation, even at flow rates of up to 650 μL/min. We also showed that, under continuous flow conditions, vesicle adsorption rates on silica surfaces follow Langmuir kinetics, with an inverse dependence on bulk vesicle concentration, while an empirical power law dependence of vesicle rupture time on bulk vesicle concentration was observed. Ultimately, this work elicits fundamental insight into the importance of flow and bulk vesicle concentration in the adsorbed vesicle rupture process during SLB formation using QCM-D.
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Affiliation(s)
- Christina M Bailey
- School of Engineering, Center for Biomedical Engineering, Institute for Molecular and Nanoscale Innovation, Brown University , Providence, Rhode Island 02912, United States
| | - Anubhav Tripathi
- School of Engineering, Center for Biomedical Engineering, Institute for Molecular and Nanoscale Innovation, Brown University , Providence, Rhode Island 02912, United States
| | - Anita Shukla
- School of Engineering, Center for Biomedical Engineering, Institute for Molecular and Nanoscale Innovation, Brown University , Providence, Rhode Island 02912, United States
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Konarzewska D, Juhaniewicz J, Güzeloğlu A, Sęk S. Characterization of planar biomimetic lipid films composed of phosphatidylethanolamines and phosphatidylglycerols from Escherichia coli. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2017; 1859:475-483. [DOI: 10.1016/j.bbamem.2017.01.010] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2016] [Revised: 01/03/2017] [Accepted: 01/05/2017] [Indexed: 01/27/2023]
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23
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Evans KO, Compton DL. Phosphatidyl-hydroxytyrosol and phosphatidyl-tyrosol bilayer properties. Chem Phys Lipids 2016; 202:69-76. [PMID: 27986474 DOI: 10.1016/j.chemphyslip.2016.11.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2016] [Revised: 11/20/2016] [Accepted: 11/29/2016] [Indexed: 12/23/2022]
Abstract
Hydroxytyrosol and tyrosol phospholipids were enzymatically synthesized and investigated for their bilayer properties. Dynamic light scattering demonstrated that hand extrusion at 100nm consistently resulted in liposomes of nearly 85nm diameter for both phosphatidyl-hydroxytyrosol (DOPHT) and phosphatidyl-tyrosol (DOPT). Transmission electron microscopy showed DOPT and DOPHT liposomes extruded at 100-nm to be spherical and non-distinctive from one another. Zeta potential measurements resulted in surface charges<-25mV, demonstrating both DOPT and DOPHT form highly stable liposomes. Quartz crystal microbalance with dissipation monitoring measurements demonstrated that liposomal adsorption was dependent on a combination of DOPT (or DOPHT) mole-percent and calcium ions concentration. Fluorescence anisotropy measurements indicated that melting temperatures of DOPT and DOPHT were below 4°C, suggesting that adsorption behavior and liposome formation was limited by electrostatic interactions and not gel-state formation.
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Affiliation(s)
- Kervin O Evans
- Renewable Products Research Unit, USDA, Agriculture Research Service, National Center for Agricultural Utilization Research Center, 1815N. University Street, Peoria, IL 61604, USA.
| | - David L Compton
- Renewable Products Research Unit, USDA, Agriculture Research Service, National Center for Agricultural Utilization Research Center, 1815N. University Street, Peoria, IL 61604, USA
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Temperature and pH sensitivity of a stabilized self-nanoemulsion formed using an ionizable lipid-like material via an oil-to-surfactant transition. Colloids Surf B Biointerfaces 2016; 151:95-101. [PMID: 27987460 DOI: 10.1016/j.colsurfb.2016.11.020] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2016] [Revised: 09/30/2016] [Accepted: 11/16/2016] [Indexed: 12/21/2022]
Abstract
Lipids functionalized with tertiary amines (ionizable lipids) for a pH-dependent positive charge have been developed extensively as a carrier material for delivering nucleic acids. We previously developed an SS-cleavable proton-activated lipid-like material (ssPalm) as a component of a functionalized lipid envelope structure of a nanoparticle that encapsulated plasmid DNA and short interfering RNA. In this study, we report on the unique characteristics of such an ionizable lipid: the formation of a nano-sized emulsion (ave. 40nm) via pH-triggered self-emulsification in the absence of a cargo (nucleic acids). The particle has a neutral charge at physiological pH and is stabilized by helper lipids and polyethyleneglycol (PEG)-conjugated lipids. The generalized polarization of 6-dodecanoyl-2-dimethylaminonaphthalene (Laurdan), which indicates the surface polarity caused by the invasion of water onto the surface, changes dynamically in response to pH and temperature, while the fluidity of the intra-particle compartment, as measured by the fluorescence anisotropy of 1,6-Diphenyl-1,3,5-hexatriene (DPH), is not affected. Even when the particle contains a high density of PEG on the surface, it shows a high fusogenecity to negatively charged liposomes in response to an acidic pH to a higher degree than a conventional cationic lipid. These characteristics suggest that the ssPalm particle possesses unique properties for delivering lipophilic drugs across the biomembrane.
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25
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Zhdanov VP, Agnarsson B, Höök F. Kinetics of enzyme-mediated hydrolysis of lipid vesicles. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2016.09.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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26
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Habel J, Ogbonna A, Larsen N, Krabbe S, Almdal K, Hélix-Nielsen C. How preparation and modification parameters affect PB-PEO polymersome properties in aqueous solution. ACTA ACUST UNITED AC 2016. [DOI: 10.1002/polb.24059] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Joachim Habel
- Department of Environmental Engineering; Technical University of Denmark; Miljøvej, Building 115, 2800 Kgs Lyngby Denmark
- Aquaporin A/S; Ole Maaløes Vej 3 Copenhagen 2200 Denmark
| | - Anayo Ogbonna
- Aquaporin A/S; Ole Maaløes Vej 3 Copenhagen 2200 Denmark
| | - Nanna Larsen
- Copenhagen Biocenter, University of Copenhagen; Ole Maaløes Vej 5 Copenhagen 2200 Denmark
| | - Simon Krabbe
- Department of Biology; University of Copenhagen; August Krogh Building, Universitetsparken 13 Copenhagen 2100 Denmark
| | - Kristoffer Almdal
- Department of Micro- and Nanotechnology; Technical University of Denmark; Produktionstorvet, Building 423, 2800 Kgs Lyngby Denmark
| | - Claus Hélix-Nielsen
- Department of Environmental Engineering; Technical University of Denmark; Miljøvej, Building 115, 2800 Kgs Lyngby Denmark
- Aquaporin A/S; Ole Maaløes Vej 3 Copenhagen 2200 Denmark
- Laboratory for Water Biophysics and Membrane Processes; Faculty of Chemistry and Chemical Engineering, University of Maribor; Smetanova Ulica 17 Maribor 2000 Slovenia
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27
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Kong X, Lu D, Wu J, Liu Z. Spreading of a Unilamellar Liposome on Charged Substrates: A Coarse-Grained Molecular Simulation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:3785-3793. [PMID: 27019394 DOI: 10.1021/acs.langmuir.6b00043] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Supported lipid bilayers (SLBs) are able to accommodate membrane proteins useful for diverse biomimetic applications. Although liposome spreading represents a common procedure for preparation of SLBs, the underlying mechanism is not yet fully understood, particularly from a molecular perspective. The present study examines the effects of the substrate charge on unilamellar liposome spreading on the basis of molecular dynamics simulations for a coarse-grained model of the solvent and lipid molecules. Liposome transformation into a lipid bilayer of different microscopic structures suggests three types of kinetic pathways depending on the substrate charge density, that is, top-receding, parachute, and parachute with wormholes. Each pathway leads to a unique distribution of the lipid molecules and thereby distinctive properties of SLBs. An increase of the substrate charge density results in a magnified asymmetry of the SLBs in terms of the ratio of charged lipids, parallel surface movements, and the distribution of lipid molecules. While the lipid mobility in the proximal layer is strongly correlated with the substrate potential, the dynamics of lipid molecules in the distal monolayer is similar to that of a freestanding lipid bilayer. For liposome spreading on a highly charged surface, wormhole formation promotes lipid exchange between the SLB monolayers thus reduces the asymmetry on the number density of lipid molecules, the lipid order parameter, and the monolayer thickness. The simulation results reveal the important regulatory role of electrostatic interactions on liposome spreading and the properties of SLBs.
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Affiliation(s)
- Xian Kong
- Key Laboratory of Industrial Biocatalysis, Chinese Ministry of Education and Department of Chemical Engineering, Tsinghua University , Beijing 100084, China
| | - Diannan Lu
- Key Laboratory of Industrial Biocatalysis, Chinese Ministry of Education and Department of Chemical Engineering, Tsinghua University , Beijing 100084, China
| | - Jianzhong Wu
- Department of Chemical and Environmental Engineering, University of California , Riverside California 92521, United States
| | - Zheng Liu
- Key Laboratory of Industrial Biocatalysis, Chinese Ministry of Education and Department of Chemical Engineering, Tsinghua University , Beijing 100084, China
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Frost R, Svedhem S, Langhammer C, Kasemo B. Graphene Oxide and Lipid Membranes: Size-Dependent Interactions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:2708-2717. [PMID: 26907859 DOI: 10.1021/acs.langmuir.5b03239] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We have investigated the interaction of graphene oxide (GO) sheets with supported lipid membranes with focus on how the interaction depends on GO sheet size (three samples in the range of 90-5000 nm) and how it differs between small and large liposomes. The layer-by-layer assembly of these materials into multilamellar structures, as discovered in our previous research, is now further explored. The interaction processes were monitored by two complementary, real time, surface-sensitive analytical techniques: quartz crystal microbalance with dissipation monitoring (QCM-D, electroacoustic sensing) and indirect nanoplasmonic sensing (INPS, optical sensing). The results show that the sizes of each of the two components, graphene oxide and liposomes, are important parameters affecting the resulting multilayer structures. Spontaneous liposome rupture onto graphene oxide is obtained for large lateral dimensions of the graphene oxide sheets.
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Affiliation(s)
- Rickard Frost
- Department of Energy and Environment and ‡Department of Applied Physics, Chalmers University of Technology , SE-412 96 Göteborg, Sweden
| | - Sofia Svedhem
- Department of Energy and Environment and ‡Department of Applied Physics, Chalmers University of Technology , SE-412 96 Göteborg, Sweden
| | - Christoph Langhammer
- Department of Energy and Environment and ‡Department of Applied Physics, Chalmers University of Technology , SE-412 96 Göteborg, Sweden
| | - Bengt Kasemo
- Department of Energy and Environment and ‡Department of Applied Physics, Chalmers University of Technology , SE-412 96 Göteborg, Sweden
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Jackman JA, Kim MC, Zhdanov VP, Cho NJ. Relationship between vesicle size and steric hindrance influences vesicle rupture on solid supports. Phys Chem Chem Phys 2016; 18:3065-72. [DOI: 10.1039/c5cp06786c] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Although it is thermodynamically favorable for adsorbed vesicles to rupture with increasing vesicle size, this study demonstrates that steric hindrance acts as a kinetic barrier to impede large vesicles from rupturing.
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Affiliation(s)
- Joshua A. Jackman
- School of Materials Science and Engineering
- Nanyang Technological University
- Singapore
- Centre for Biomimetic Sensor Science
- Nanyang Technological University
| | - Min Chul Kim
- School of Materials Science and Engineering
- Nanyang Technological University
- Singapore
- Centre for Biomimetic Sensor Science
- Nanyang Technological University
| | - Vladimir P. Zhdanov
- School of Materials Science and Engineering
- Nanyang Technological University
- Singapore
- Centre for Biomimetic Sensor Science
- Nanyang Technological University
| | - Nam-Joon Cho
- School of Materials Science and Engineering
- Nanyang Technological University
- Singapore
- Centre for Biomimetic Sensor Science
- Nanyang Technological University
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30
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Tabaei SR, Jackman JA, Kim M, Yorulmaz S, Vafaei S, Cho NJ. Biomembrane Fabrication by the Solvent-assisted Lipid Bilayer (SALB) Method. J Vis Exp 2015. [PMID: 26650537 PMCID: PMC4692765 DOI: 10.3791/53073] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
In order to mimic cell membranes, the supported lipid bilayer (SLB) is an attractive platform which enables in vitro investigation of membrane-related processes while conferring biocompatibility and biofunctionality to solid substrates. The spontaneous adsorption and rupture of phospholipid vesicles is the most commonly used method to form SLBs. However, under physiological conditions, vesicle fusion (VF) is limited to only a subset of lipid compositions and solid supports. Here, we describe a one-step general procedure called the solvent-assisted lipid bilayer (SALB) formation method in order to form SLBs which does not require vesicles. The SALB method involves the deposition of lipid molecules onto a solid surface in the presence of water-miscible organic solvents (e.g., isopropanol) and subsequent solvent-exchange with aqueous buffer solution in order to trigger SLB formation. The continuous solvent exchange step enables application of the method in a flow-through configuration suitable for monitoring bilayer formation and subsequent alterations using a wide range of surface-sensitive biosensors. The SALB method can be used to fabricate SLBs on a wide range of hydrophilic solid surfaces, including those which are intractable to vesicle fusion. In addition, it enables fabrication of SLBs composed of lipid compositions which cannot be prepared using the vesicle fusion method. Herein, we compare results obtained with the SALB and conventional vesicle fusion methods on two illustrative hydrophilic surfaces, silicon dioxide and gold. To optimize the experimental conditions for preparation of high quality bilayers prepared via the SALB method, the effect of various parameters, including the type of organic solvent in the deposition step, the rate of solvent exchange, and the lipid concentration is discussed along with troubleshooting tips. Formation of supported membranes containing high fractions of cholesterol is also demonstrated with the SALB method, highlighting the technical capabilities of the SALB technique for a wide range of membrane configurations.
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Affiliation(s)
- Seyed R Tabaei
- School of Materials Science and Engineering, Nanyang Technological University; Centre for Biomimetic Sensor Science, Nanyang Technological University
| | - Joshua A Jackman
- School of Materials Science and Engineering, Nanyang Technological University; Centre for Biomimetic Sensor Science, Nanyang Technological University
| | - Minchul Kim
- School of Materials Science and Engineering, Nanyang Technological University; Centre for Biomimetic Sensor Science, Nanyang Technological University
| | - Saziye Yorulmaz
- School of Materials Science and Engineering, Nanyang Technological University; Centre for Biomimetic Sensor Science, Nanyang Technological University
| | - Setareh Vafaei
- School of Materials Science and Engineering, Nanyang Technological University; Centre for Biomimetic Sensor Science, Nanyang Technological University
| | - Nam-Joon Cho
- School of Materials Science and Engineering, Nanyang Technological University; Centre for Biomimetic Sensor Science, Nanyang Technological University; School of Chemical and Biomedical Engineering, Nanyang Technological University;
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31
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Frohnmayer JP, Brüggemann D, Eberhard C, Neubauer S, Mollenhauer C, Boehm H, Kessler H, Geiger B, Spatz JP. Minimal synthetic cells to study integrin-mediated adhesion. Angew Chem Int Ed Engl 2015; 54:12472-8. [PMID: 26257266 PMCID: PMC4675076 DOI: 10.1002/anie.201503184] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2015] [Revised: 05/28/2015] [Indexed: 11/12/2022]
Abstract
To shed light on cell-adhesion-related molecular pathways, synthetic cells offer the unique advantage of a well-controlled model system with reduced molecular complexity. Herein, we show that liposomes with the reconstituted platelet integrin αIIb β3 as the adhesion-mediating transmembrane protein are a functional minimal cell model for studying cellular adhesion mechanisms in a defined environment. The interaction of these synthetic cells with various extracellular matrix proteins was analyzed using a quartz crystal microbalance with dissipation monitoring. The data indicated that integrin was functionally incorporated into the lipid vesicles, thus enabling integrin-specific adhesion of the engineered liposomes to fibrinogen- and fibronectin-functionalized surfaces. Then, we were able to initiate the detachment of integrin liposomes from these surfaces in the presence of the peptide GRGDSP, a process that is even faster with our newly synthesized peptide mimetic SN529, which specifically inhibits the integrin αIIb β3 .
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Affiliation(s)
- Johannes P Frohnmayer
- Department of New Materials and Biosystems, Max Planck Institute for Intelligent SystemsHeisenbergstrasse 3, 70569 Stuttgart (Germany)Department of Biophysical Chemistry, University of HeidelbergINF 253, 69120 Heidelberg (Germany) E-mail:
| | - Dorothea Brüggemann
- Department of New Materials and Biosystems, Max Planck Institute for Intelligent SystemsHeisenbergstrasse 3, 70569 Stuttgart (Germany)Department of Biophysical Chemistry, University of HeidelbergINF 253, 69120 Heidelberg (Germany) E-mail:
| | - Christian Eberhard
- Department of New Materials and Biosystems, Max Planck Institute for Intelligent SystemsHeisenbergstrasse 3, 70569 Stuttgart (Germany)Department of Biophysical Chemistry, University of HeidelbergINF 253, 69120 Heidelberg (Germany) E-mail:
| | - Stefanie Neubauer
- Institute for Advanced Study (IAS) and Center of Integrated Protein Science (CIPSM), Department Chemie, Technische Universität MünchenLichtenbergstrasse 4, 85747 Garching (Germany)
| | - Christine Mollenhauer
- Department of New Materials and Biosystems, Max Planck Institute for Intelligent SystemsHeisenbergstrasse 3, 70569 Stuttgart (Germany)Department of Biophysical Chemistry, University of HeidelbergINF 253, 69120 Heidelberg (Germany) E-mail:
- CSF Biomaterials and Cellular Biophysics, Max Planck Institute for Intelligent SystemsHeisenbergstrasse 3, 70569 Stuttgart (Germany)
| | - Heike Boehm
- Department of New Materials and Biosystems, Max Planck Institute for Intelligent SystemsHeisenbergstrasse 3, 70569 Stuttgart (Germany)Department of Biophysical Chemistry, University of HeidelbergINF 253, 69120 Heidelberg (Germany) E-mail:
- CSF Biomaterials and Cellular Biophysics, Max Planck Institute for Intelligent SystemsHeisenbergstrasse 3, 70569 Stuttgart (Germany)
| | - Horst Kessler
- Institute for Advanced Study (IAS) and Center of Integrated Protein Science (CIPSM), Department Chemie, Technische Universität MünchenLichtenbergstrasse 4, 85747 Garching (Germany)
| | - Benjamin Geiger
- The Weizmann Institute of Science, Department of Molecular Cell BiologyRehovot (Israel)
| | - Joachim P Spatz
- Department of New Materials and Biosystems, Max Planck Institute for Intelligent SystemsHeisenbergstrasse 3, 70569 Stuttgart (Germany)Department of Biophysical Chemistry, University of HeidelbergINF 253, 69120 Heidelberg (Germany) E-mail:
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32
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Yoon BK, Jackman JA, Kim MC, Cho NJ. Spectrum of Membrane Morphological Responses to Antibacterial Fatty Acids and Related Surfactants. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:10223-32. [PMID: 26325618 DOI: 10.1021/acs.langmuir.5b02088] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Medium-chain saturated fatty acids and related compounds (e.g., monoglycerides) represent one class of membrane-active surfactants with antimicrobial properties. Most related studies have been in vitro evaluations of bacterial growth inhibition, and there is limited knowledge about how the compounds in this class destabilize lipid bilayers, which are the purported target within the bacterial cell membrane. Herein, the interaction between three representative compounds in this class and a supported lipid bilayer platform was investigated using quartz crystal microbalance-dissipation and fluorescence microscopy in order to examine membrane destabilization. The three tested compounds were lauric acid, sodium dodecyl sulfate, and glycerol monolaurate. For each compound, we discovered striking differences in the resulting morphological changes of supported lipid bilayers. The experimental trends indicate that the compounds have membrane-disruptive behavior against supported lipid bilayers principally above the respective critical micelle concentration values. The growth inhibition properties of the compounds against standard and methicillin-resistant Staphylococcus aureus bacterial strains were also tested. Taken together, the findings in this work improve our knowledge about how saturated fatty acids and related compounds destabilize lipid bilayers, offering insight into the corresponding molecular mechanisms that lead to membrane morphological responses.
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Affiliation(s)
| | | | | | - Nam-Joon Cho
- School of Chemical and Biomedical Engineering, Nanyang Technological University , 62 Nanyang Drive 637459, Singapore
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Elucidating how bamboo salt interacts with supported lipid membranes: influence of alkalinity on membrane fluidity. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2015; 44:383-91. [PMID: 26002548 DOI: 10.1007/s00249-015-1043-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2014] [Revised: 05/02/2015] [Accepted: 05/13/2015] [Indexed: 10/23/2022]
Abstract
Bamboo salt is a traditional medicine produced from sea salt. It is widely used in Oriental medicine and is an alkalizing agent with reported antiinflammatory, antimicrobial and chemotherapeutic properties. Notwithstanding, linking specific molecular mechanisms with these properties has been challenging to establish in biological systems. In part, this issue may be related to bamboo salt eliciting nonspecific effects on components found within these systems. Herein, we investigated the effects of bamboo salt solution on supported lipid bilayers as a model system to characterize the interaction between lipid membranes and bamboo salt. The atomic composition of unprocessed and processed bamboo salts was first analyzed by mass spectrometry, and we identified several elements that have not been previously reported in other bamboo salt preparations. The alkalinity of hydrated samples was also measured and determined to be between pH 10 and 11 for bamboo salts. The effect of processed bamboo salt solutions on the fluidic properties of a supported lipid bilayer on glass was next investigated by fluorescence recovery after photobleaching (FRAP) analysis. It was demonstrated that, with increasing ionic strength of the bamboo salt solution, the fluidity of a lipid bilayer increased. On the contrary, increasing the ionic strength of near-neutral buffer solutions with sodium chloride salt diminished fluidity. To reconcile these two observations, we identified that solution alkalinity is critical for the effects of bamboo salt on membrane fluidity, as confirmed using three additional commercial bamboo salt preparations. Extended-DLVO model calculations support that the effects of bamboo salt on lipid membranes are due to the alkalinity imparting a stronger hydration force. Collectively, the results of this work demonstrate that processing of bamboo salt strongly affects its atomic composition and that the alkalinity of bamboo salt solutions contributes to its effect on membrane fluidity.
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Tabaei SR, Jackman JA, Kim SO, Zhdanov VP, Cho NJ. Solvent-assisted lipid self-assembly at hydrophilic surfaces: factors influencing the formation of supported membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:3125-34. [PMID: 25679066 DOI: 10.1021/la5048497] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
As a simple and efficient technique, the solvent-assisted lipid bilayer (SALB) formation method offers a versatile approach to fabricating a planar lipid bilayer on solid supports. Corresponding mechanistic aspects and the role of various governing parameters remain, however, to be better understood. Herein, we first scrutinized the effect of lipid concentration (0.01 to 5 mg/mL) and solvent type (isopropanol, n-propanol, or ethanol) on SALB formation on silicon oxide in order to identify optimal conditions for this process. The obtained fluid-phase lipid layers on silicon oxide were investigated by using the quartz crystal microbalance with dissipation monitoring, epifluorescence microscopy, and atomic force microscopy. The experimental results indicate that, in alcohol, lipid attachment to the substrate is reversible and reaches equilibrium in accordance with the bulk lipid concentration. During the solvent-exchange step, the water fraction increases and the deposited lipids are converted into planar bilayer fragments, along with the concurrent adsorption and rupture of micelles within an optimal lipid concentration range. In addition, fluid-phase lipid bilayers were successfully formed on other substrates (e.g., chrome, indium tin oxide, and titanium oxide) that are largely intractable to conventional methods (e.g., vesicle fusion). Moreover, gel-phase lipid bilayers were fabricated as well. Depending on the phase state of the lipid bilayer during fabrication, the corresponding adlayer mass varied by approximately 20% between the fluid- and gel-phase states in a manner which is consistent with the molecular packing of lipids in the two arrangements. Taken together, our findings help to explain the mechanistic details of SALB formation, optimize the corresponding procedure, and demonstrate the general utility for fabricating gel- and fluid-phase planar lipid bilayers.
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Affiliation(s)
- Seyed R Tabaei
- †School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue 639798, Singapore
- ‡Centre for Biomimetic Sensor Science, Nanyang Technological University, 50 Nanyang Drive 637553, Singapore
| | - Joshua A Jackman
- †School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue 639798, Singapore
- ‡Centre for Biomimetic Sensor Science, Nanyang Technological University, 50 Nanyang Drive 637553, Singapore
| | - Seong-Oh Kim
- †School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue 639798, Singapore
- ‡Centre for Biomimetic Sensor Science, Nanyang Technological University, 50 Nanyang Drive 637553, Singapore
| | - Vladimir P Zhdanov
- †School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue 639798, Singapore
- ‡Centre for Biomimetic Sensor Science, Nanyang Technological University, 50 Nanyang Drive 637553, Singapore
- ∥Boreskov Institute of Catalysis, Russian Academy of Sciences, Novosibirsk 630090, Russia
| | - Nam-Joon Cho
- †School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue 639798, Singapore
- ‡Centre for Biomimetic Sensor Science, Nanyang Technological University, 50 Nanyang Drive 637553, Singapore
- §School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive 637459, Singapore
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Tabaei SR, Cho NJ. Lamellar sheet exfoliation of single lipid vesicles by a membrane-active peptide. Chem Commun (Camb) 2015; 51:10272-5. [DOI: 10.1039/c5cc02769a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Using total internal fluorescence microscopy, highly parallel measurements of single lipid vesicles unexpectedly reveal that a small fraction of vesicles rupture in multiple discrete steps when destabilized by a membrane-active peptide which is in contrast to classical solubilization models.
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Affiliation(s)
- Seyed R. Tabaei
- School of Materials Science and Engineering
- Nanyang Technological University
- Singapore
- Centre for Biomimetic Sensor Science
- Nanyang Technological University
| | - N. J. Cho
- School of Materials Science and Engineering
- Nanyang Technological University
- Singapore
- Centre for Biomimetic Sensor Science
- Nanyang Technological University
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Yorulmaz S, Tabaei SR, Kim M, Seo J, Hunziker W, Szebeni J, Cho NJ. Membrane attack complex formation on a supported lipid bilayer: initial steps towards a CARPA predictor nanodevice. EUROPEAN JOURNAL OF NANOMEDICINE 2015. [DOI: 10.1515/ejnm-2015-0016] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
AbstractThe rapid advance of nanomedicines and biologicals in pharmacotherapy gives increasing importance to a common adverse effect of these modern therapeutics: complement (C) activation-related pseudoallergy (CARPA). CARPA is a relatively frequent and potentially lethal acute immune toxicity of many intravenous drugs that contain nanoparticles or proteins, whose prediction by laboratory or in vivo testing has not yet been solved. Preliminary studies suggest that proneness of the drug to cause C activation in the blood of patients may predict the individual risk of CARPA, thus, a sensitive and rapid bedside assay for individualized assessment of a drug’s C activating potential could alleviate the CARPA problem. The goal of the present study was to lay down the foundations of a novel approach for real-time sensing of C activation on a supported lipid bilayer platform. We utilized the quartz crystal microbalance with dissipation (QCM-D) monitoring technique to measure the self-assembly of C terminal complex (or membrane attack complex [MAC]) on supported lipid bilayers rapidly assembled by the solvent-assisted lipid bilayer (SALB) formation method, as an immediate measure of C activation. By measuring the changes in frequency and energy dissipation of deposited protein, the technique allows extremely sensitive real-time quantification of the sequential assembly of MAC from its molecular components (C5b-6, C7, C8 and C9) and hence, measure C activation in the ambient medium. The present paper delineates the technique and our initial evidence with purified C proteins that the approach enables sensitive and rapid (real-time) quantification of MAC formation on a silicon-supported planar (phospho) lipid bilayer, which can be used as an endpoint in a clinically useful bedside C activation assay.
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Kim MC, Gillissen JJJ, Tabaei SR, Zhdanov VP, Cho NJ. Spatiotemporal dynamics of solvent-assisted lipid bilayer formation. Phys Chem Chem Phys 2015; 17:31145-51. [DOI: 10.1039/c5cp05950j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Spatiotemporal dynamics of the solvent-assisted lipid bilayer (SALB) formation process are unraveled using a combination of experimental and theoretical approaches.
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Affiliation(s)
- Min Chul Kim
- School of Materials Science and Engineering
- Nanyang Technological University
- Singapore
- Centre for Biomimetic Sensor Science
- Nanyang Technological University
| | - Jurriaan J. J. Gillissen
- School of Materials Science and Engineering
- Nanyang Technological University
- Singapore
- Centre for Biomimetic Sensor Science
- Nanyang Technological University
| | - Seyed R. Tabaei
- School of Materials Science and Engineering
- Nanyang Technological University
- Singapore
- Centre for Biomimetic Sensor Science
- Nanyang Technological University
| | - Vladimir P. Zhdanov
- School of Materials Science and Engineering
- Nanyang Technological University
- Singapore
- Centre for Biomimetic Sensor Science
- Nanyang Technological University
| | - Nam-Joon Cho
- School of Materials Science and Engineering
- Nanyang Technological University
- Singapore
- Centre for Biomimetic Sensor Science
- Nanyang Technological University
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Tabaei SR, Choi JH, Haw Zan G, Zhdanov VP, Cho NJ. Solvent-assisted lipid bilayer formation on silicon dioxide and gold. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:10363-73. [PMID: 25111254 DOI: 10.1021/la501534f] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Planar lipid bilayers on solid supports mimic the fundamental structure of biological membranes and can be investigated using a wide range of surface-sensitive techniques. Despite these advantages, planar bilayer fabrication is challenging, and there are no simple universal methods to form such bilayers on diverse material substrates. One of the novel methods recently proposed and proven to form a planar bilayer on silicon dioxide involves lipid deposition in organic solvent and solvent exchange to influence the phase of adsorbed lipids. To scrutinize the specifics of this solvent-assisted lipid bilayer (SALB) formation method and clarify the limits of its applicability, we have developed a simplified, continuous solvent-exchange version to form planar bilayers on silicon dioxide, gold, and alkanethiol-coated gold (in the latter case, a lipid monolayer is formed to yield a hybrid bilayer) and varied the type of organic solvent and rate of solvent exchange. By tracking the SALB formation process with simultaneous quartz crystal microbalance-dissipation (QCM-D) and ellipsometry, it was determined that the acoustic, optical, and hydration masses along with the acoustic and optical thicknesses, measured at the end of the process, are comparable to those observed by employing conventional fabrication methods (e.g., vesicle fusion). As shown by QCM-D measurements, the obtained planar bilayers are highly resistant to protein adsorption, and several, but not all, water-miscible organic solvents could be successfully used in the SALB procedure, with isopropanol yielding particularly high-quality bilayers. In addition, fluorescence recovery after photobleaching (FRAP) measurements demonstrated that the coefficient of lateral lipid diffusion in the fabricated bilayers corresponds to that measured earlier in the planar bilayers formed by vesicle fusion. With increasing rate of solvent exchange, it was also observed that the bilayer became incomplete and a phenomenological model was developed in order to explain this feature. The results obtained allowed us to clarify and discriminate likely steps of the SALB formation process as well as determine the corresponding influence of organic solvent type and flow conditions on these steps. Taken together, the findings demonstrate that the SALB formation method can be adapted to a continuous solvent-exchange procedure that is technically minimal, quick, and efficient to form planar bilayers on solid supports.
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Affiliation(s)
- Seyed R Tabaei
- School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue, 639798 Singapore
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Jackman JA, Zhdanov VP, Cho NJ. Nanoplasmonic biosensing for soft matter adsorption: kinetics of lipid vesicle attachment and shape deformation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:9494-503. [PMID: 25035920 DOI: 10.1021/la502431x] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
An indirect nanoplasmonic sensing platform is reported for investigating the kinetics of attachment and shape deformation associated with lipid vesicle adsorption onto a titanium oxide-coated substrate. The localized surface plasmon resonance (LSPR) originates from embedded gold nanodisks and is highly sensitive to the local lipid environment. To interpret the corresponding results, we have extended treatments of diffusion-limited adsorption kinetics and adsorbate-related LSPR physics, identified the expected scaling laws for the LSPR-tracked kinetics measured at different lipid concentrations and/or nanometer-scale vesicle sizes in the case when vesicle deformation is negligible, and scrutinized experimental deviations accordingly. After adsorption, the smallest 58 nm diameter vesicles were found to maintain shape on the time scale of adsorption at high lipid concentrations in solution, and shape deformation became more appreciable at lower lipid concentrations. Higher saturation coverage was observed with increasing lipid concentration, which is attributed to the difference in relative time scales of vesicle attachment and deformation. For larger vesicles between 80 and 160 nm diameter, deviations associated with their shape deformation and correlations with the location of gold nanodisks became more apparent at moderate and high coverages. Taken together, the results obtained support that the quantitative measurement capabilities of nanoplasmonic biosensing should be considered for applications demanding highly surface-sensitive characterization of soft matter adsorption and related phenomena at liquid-solid interfaces.
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Affiliation(s)
- Joshua A Jackman
- School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue, 639798 Singapore
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