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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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2
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Fu M, Franquelim HG, Kretschmer S, Schwille P. Non‐Equilibrium Large‐Scale Membrane Transformations Driven by MinDE Biochemical Reaction Cycles. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202015184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Meifang Fu
- Dept. Cellular and Molecular Biophysics Max Planck Institute of Biochemistry Am Klopferspitz 18 82152 Martinsried Germany
| | - Henri G. Franquelim
- Dept. Cellular and Molecular Biophysics Max Planck Institute of Biochemistry Am Klopferspitz 18 82152 Martinsried Germany
| | - Simon Kretschmer
- Dept. Cellular and Molecular Biophysics Max Planck Institute of Biochemistry Am Klopferspitz 18 82152 Martinsried Germany
- Department of Bioengineering and Therapeutic Science University of California San Francisco San Francisco CA USA
| | - Petra Schwille
- Dept. Cellular and Molecular Biophysics Max Planck Institute of Biochemistry Am Klopferspitz 18 82152 Martinsried Germany
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Fu M, Franquelim HG, Kretschmer S, Schwille P. Non-Equilibrium Large-Scale Membrane Transformations Driven by MinDE Biochemical Reaction Cycles. Angew Chem Int Ed Engl 2021; 60:6496-6502. [PMID: 33285025 PMCID: PMC7986748 DOI: 10.1002/anie.202015184] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Indexed: 12/11/2022]
Abstract
The MinDE proteins from E. coli have received great attention as a paradigmatic biological pattern-forming system. Recently, it has surfaced that these proteins do not only generate oscillating concentration gradients driven by ATP hydrolysis, but that they can reversibly deform giant vesicles. In order to explore the potential of Min proteins to actually perform mechanical work, we introduce a new model membrane system, flat vesicle stacks on top of a supported lipid bilayer. MinDE oscillations can repeatedly deform these flat vesicles into tubules and promote progressive membrane spreading through membrane adhesion. Dependent on membrane and buffer compositions, Min oscillations further induce robust bud formation. Altogether, we demonstrate that under specific conditions, MinDE self-organization can result in work performed on biomimetic systems and achieve a straightforward mechanochemical coupling between the MinDE biochemical reaction cycle and membrane transformation.
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Affiliation(s)
- Meifang Fu
- Dept. Cellular and Molecular BiophysicsMax Planck Institute of BiochemistryAm Klopferspitz 1882152MartinsriedGermany
| | - Henri G. Franquelim
- Dept. Cellular and Molecular BiophysicsMax Planck Institute of BiochemistryAm Klopferspitz 1882152MartinsriedGermany
| | - Simon Kretschmer
- Dept. Cellular and Molecular BiophysicsMax Planck Institute of BiochemistryAm Klopferspitz 1882152MartinsriedGermany
- Department of Bioengineering and Therapeutic ScienceUniversity of California San FranciscoSan FranciscoCAUSA
| | - Petra Schwille
- Dept. Cellular and Molecular BiophysicsMax Planck Institute of BiochemistryAm Klopferspitz 1882152MartinsriedGermany
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4
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Hohendahl A, Talledge N, Galli V, Shen PS, Humbert F, De Camilli P, Frost A, Roux A. Structural inhibition of dynamin-mediated membrane fission by endophilin. eLife 2017; 6:26856. [PMID: 28933693 PMCID: PMC5663480 DOI: 10.7554/elife.26856] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Accepted: 09/20/2017] [Indexed: 01/19/2023] Open
Abstract
Dynamin, which mediates membrane fission during endocytosis, binds endophilin and other members of the Bin-Amphiphysin-Rvs (BAR) protein family. How endophilin influences endocytic membrane fission is still unclear. Here, we show that dynamin-mediated membrane fission is potently inhibited in vitro when an excess of endophilin co-assembles with dynamin around membrane tubules. We further show by electron microscopy that endophilin intercalates between turns of the dynamin helix and impairs fission by preventing trans interactions between dynamin rungs that are thought to play critical roles in membrane constriction. In living cells, overexpression of endophilin delayed both fission and transferrin uptake. Together, our observations suggest that while endophilin helps shape endocytic tubules and recruit dynamin to endocytic sites, it can also block membrane fission when present in excess by inhibiting inter-dynamin interactions. The sequence of recruitment and the relative stoichiometry of the two proteins may be critical to regulated endocytic fission.
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Affiliation(s)
- Annika Hohendahl
- Biochemistry Department, University of Geneva, Geneva, Switzerland
| | - Nathaniel Talledge
- Department of Biochemistry and Biophysics, University of California, San Francisco, United States.,California Institute for Quantitative Biomedical Research, University of California, San Francisco, United States.,Department of Biochemistry, University of Utah, Salt Lake City, United States.,Chan Zuckerberg Biohub, San Francisco, United States
| | - Valentina Galli
- Biochemistry Department, University of Geneva, Geneva, Switzerland
| | - Peter S Shen
- Department of Biochemistry, University of Utah, Salt Lake City, United States
| | - Frédéric Humbert
- Biochemistry Department, University of Geneva, Geneva, Switzerland
| | - Pietro De Camilli
- Department of Neuroscience, Yale University School of Medicine, New Haven, United States.,Program in Cellular Neuroscience, Neurodegeneration and Repair, Yale University School of Medicine, New Haven, United States.,Kavli Institute for Neuroscience, Yale University School of Medicine, New Haven, United States.,Department of Cell Biology, Yale University School of Medicine, New Haven, United States.,Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, United States
| | - Adam Frost
- Department of Biochemistry and Biophysics, University of California, San Francisco, United States.,California Institute for Quantitative Biomedical Research, University of California, San Francisco, United States.,Department of Biochemistry, University of Utah, Salt Lake City, United States.,Chan Zuckerberg Biohub, San Francisco, United States
| | - Aurélien Roux
- Biochemistry Department, University of Geneva, Geneva, Switzerland.,Swiss National Centre for Competence in Research Programme Chemical Biology, Geneva, Switzerland
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Motegi T, Nabika H, Murakoshi K. Enhanced Brownian ratchet molecular separation using a self-spreading lipid bilayer. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:6656-6661. [PMID: 22500817 DOI: 10.1021/la300410j] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A new approach is proposed for two-dimensional molecular separation based on the Brownian ratchet mechanism by use of a self-spreading lipid bilayer as both a molecular transport and separation medium. In addition to conventional diffusivity-dependence on the ratchet separation efficiency, the difference in the intermolecular interactions between the target molecules and the lipid bilayer is also incorporated as a new separation factor in the present self-spreading ratchet system. Spreading at the gap between two ratchet obstacles causes a local change in the lipid density at the gap. This effect produces an additional opportunity for a molecule to be deflected at the ratchet obstacle and thus causes an additional angle shift. This enables the separation of molecules with the same diffusivity but with different intermolecular interaction between the target molecule and surrounding lipid molecules. Here we demonstrate this aspect by using cholera toxin subunit B (CTB)-ganglioside GM1 (GM1) complexes with different configurations. The present results will unlock a new strategy for two-dimensional molecular manipulation with ultrasmall devices.
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Affiliation(s)
- Toshinori Motegi
- Department of Chemistry, Faculty of Science, Hokkaido University , N10W8, Kita, Sapporo 060-0810, Japan
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Isono T, Ikeda T, Ogino T. Evolution of supported planar lipid bilayers on step-controlled sapphire surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:9607-9611. [PMID: 20345104 DOI: 10.1021/la100179q] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Self-organized step/terrace structures on a sapphire surface were used to investigate interface properties between a solid surface and a supported planar lipid bilayer (SPB). We prepared random-stepped, single-stepped and multistepped sapphire surfaces. Some multistepped surfaces covered with crossing steps exhibit phase-separation into hydrophilic and hydrophobic domains. We studied evolution of self-spreading lipid bilayers that are subject to the atomic structures and chemical states on the surfaces. The growth direction of SPBs in the self-spreading method is regulated by the atomic steps. While the SPBs were apparently uniform after a 1 h self-spreading, a density gradient of the lipid molecules was observed even after 24 h spreading. We found that various patterns of the SPBs that depend on the density of the lipid molecules are self-assembled on the phase-separated surfaces. Although the SPB is supported on the sapphire surface via an about 1 nm water layer, the self-spreading direction and the morphology of the SPBs are affected by the atomic steps, whose height is much smaller than that of the water layer.
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Affiliation(s)
- Toshinari Isono
- Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan.
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Nabika H, Iijima N, Takimoto B, Ueno K, Misawa H, Murakoshi K. Segregation of molecules in lipid bilayer spreading through metal nanogates. Anal Chem 2009; 81:699-704. [PMID: 19093749 DOI: 10.1021/ac802130e] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A new methodology for nanoscopic molecular filtering was developed using a substrate with a periodic array of metallic nanogates with various widths between 75 and 500 nm. A self-spreading lipid bilayer was employed as the molecular transport and filtering medium. Dye-labeled molecules doped in the self-spreading lipid bilayer were filtered after the spreading less than a few tens of micrometers on the nanogate array. Quantitative analysis of the spreading dynamics suggests that the filtering effect originates from the formation of the chemical potential barrier at the nanogate region, which is believed to be due to structural change such as compression imposed on the spreading lipid bilayer at the gate. A highly localized chemical potential barrier affects the ability of the doped dye-labeled molecules to penetrate the gate. The use of the self-spreading lipid bilayer allows molecular transportation without the use of any external field such as an electric field as is used in electrophoresis. The present system could be applied micro- and nanoscopic device technologies as it provides a completely nonbiased filtering methodology.
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Affiliation(s)
- Hideki Nabika
- Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo, 060-0810, Japan
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West J, Manz A, Dittrich PS. Massively parallel production of lipid microstructures. LAB ON A CHIP 2008; 8:1852-5. [PMID: 18941685 DOI: 10.1039/b811448j] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
In this paper we describe a simple and inexpensive microfluidic system for the production of lipid tubules and vesicles. The system incorporates a central microporous membrane for interfacing lipid films with aqueous flows. Hydrodynamic drag was used for the parallel elongation of high axial ratio lipid tubules with uniform 1.5 +/- 0.5 microm diameters. Alternatively, electrokinetic operation was used for the rapid and continuous production of vast numbers of lipid vesicles with diameters ranging from 1 to 3 microm.
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Affiliation(s)
- Jonathan West
- Institute for Analytical Sciences, Bunsen-Kirchhoff-Str. 11, D-44139, Dortmund, Germany
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9
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West J, Manz A, Dittrich PS. Lipid nanotubule fabrication by microfluidic tweezing. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:6754-6758. [PMID: 18503287 DOI: 10.1021/la8004823] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
There is currently great interest in the development of lipid enclosed systems with complex geometrical arrangements that mimic cellular compartments. With biochemical functionalization, these soft matter devices can be used to probe deeper into life's transport dominated biochemical operations. In this paper, we present a novel tool for machining lipid nanotubules by microfluidic tweezing. A bilayer poly(dimethylsiloxane) (PDMS) device was designed with a lipid reservoir that was loaded by capillary action for lipid film deposition. The lipid reservoir is vertically separated from an upper flow for controlled material wetting and the formation of giant tubule bodies. Three fluidic paths are interfaced for introduction of the giant tubules into the high velocity center of a parabolic flow profile for exposure to hydrodynamic shear stresses. At local velocities approximating 2 mm s (-1), a 300-500 nm diameter jet of lipid material was tweezed from the giant tubule body and elongated with the flow. The high velocity flow provides uniform drag for the rapid and continuous fabrication of lipid nanotubules with tremendous axial ratios. Below a critical velocity, a remarkable shape transformation occurred and the projected lipid tubule grew until a constant 3.6 mum diameter tubule was attained. These lipid tubules could be wired for the construction of advanced lifelike bioreactor systems.
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Affiliation(s)
- Jonathan West
- Institute for Analytical Sciences, Bunsen-Kirchhoff-Str. 11, D-44139 Dortmund, Germany
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10
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Nabika H, Takimoto B, Murakoshi K. Molecular separation in the lipid bilayer medium: electrophoretic and self-spreading approaches. Anal Bioanal Chem 2008; 391:2497-506. [DOI: 10.1007/s00216-008-2140-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2008] [Revised: 04/01/2008] [Accepted: 04/15/2008] [Indexed: 11/29/2022]
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11
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Nabika H, Fukasawa A, Murakoshi K. Tuning the dynamics and molecular distribution of the self-spreading lipid bilayer. Phys Chem Chem Phys 2008; 10:2243-8. [DOI: 10.1039/b715983h] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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12
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Chen X, Tsujii K. Synthetic myelin figures immobilized in polymer gels. SOFT MATTER 2007; 3:852-856. [PMID: 32900077 DOI: 10.1039/b701455d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Myelin-like instabilities usually form from the interface of amphiphilic lamellar phases and solvent, and resemble the neuron-like structures in nerve systems. However, these myelin structures are thermodynamically unstable. We herein present our first success in synthesizing stable myelin figures separated organized-polymerization. Myelin figures formed with a polymerizable nonionic surfactant have been immobilized in polymer gels. The results obtained from confocal laser scanning microscopy (CLSM), small angle X-ray scattering (SASX) and freeze fracture transmission electron microscopy (FF-TEM) clearly prove that the myelin structures have been well immobilized without any structural change. The immobilized myelin structures in polymer gels were kept for 6 months and no obvious change was observed in their structures and/or shapes. The success in stabilizing these unstable myelin structures provides some potential for applications, such as anisotropic gels, electrophoresis mediums for the separation of hydrophobic materials and so on.
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Affiliation(s)
- Xinjiang Chen
- Nanotechnology Research Center, Research Institute for Electronic Science, Hokkaido University, CRIS Building, N-21, W-10, Kita-ku, Sapporo, 001-0021, Japan and Graduate School of Science, Hokkaido University, N-12, W-6, Kita-ku, Sapporo, 060-0812, Japan
| | - Kaoru Tsujii
- Nanotechnology Research Center, Research Institute for Electronic Science, Hokkaido University, CRIS Building, N-21, W-10, Kita-ku, Sapporo, 001-0021, Japan and CREST, JST, Japan.
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13
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Nabika H, Fukasawa A, Murakoshi K. Control of the structure of self-spreading lipid membrane by changing electrolyte concentration. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:10927-31. [PMID: 17154567 DOI: 10.1021/la062459y] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
We have controlled the structure of self-spreading lipid bilayer membranes prepared on surface-oxidized silicon substrates by changing electrolyte concentration. Analysis of the fluorescence intensity, considering the optical interference effect, clarified the stacking structure of the lipid membrane. By varying the electrolyte concentration, we can vary the number of single multilamellar lobes adsorbed on the underlying self-spreading bilayer. This dependence of the stacking ability on the electrolyte concentration was investigated on the basis of changes in the bilayer-lobe interaction energies, including van der Waals, electrostatic double layer, and hydration interaction energies. Theoretical estimation suggests that the observed electrolyte concentration dependence can be explained by the combination of the van der Waals attractive interaction energy and the repulsive double-layer interaction energy.
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Affiliation(s)
- Hideki Nabika
- Division of Chemistry, Graduate School of Science, Hokkaido University, N10 W8, Kita, Sapporo, Hokkaido 060-0810, Japan
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Furukawa K, Nakashima H, Kashimura Y, Torimitsu K. Microchannel device using self-spreading lipid bilayer as molecule carrier. LAB ON A CHIP 2006; 6:1001-6. [PMID: 16874369 DOI: 10.1039/b603568j] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
We propose a microchannel device that employs a surface-supported self-spreading lipid bilayer membrane as a molecule carrying medium. The device has a micropattern structure fabricated on a SiO2 surface by photolithography, into which a self-spreading lipid bilayer membrane is introduced as the carrier medium. This system corresponds to a microchannel with a single lipid bilayer membrane height of approximately 5 nm, compared with conventional micro-fluidic channels that have a section height and width of at least several microm. The device is beneficial for detecting intermolecular interactions when molecules carried by the self-spreading lipid bilayer collide with each other in the microchannel. The validity of the device was confirmed by observing the fluorescence resonance energy transfer (FRET) between two dye molecules, coumarin and fluorescein.
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Affiliation(s)
- Kazuaki Furukawa
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi, Kanagawa, Japan 243-0198.
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Battaglia G, Ryan AJ. Neuron-Like Tubular Membranes Made of Diblock Copolymer Amphiphiles. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200503334] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Battaglia G, Ryan AJ. Neuron-Like Tubular Membranes Made of Diblock Copolymer Amphiphiles. Angew Chem Int Ed Engl 2006; 45:2052-6. [PMID: 16493714 DOI: 10.1002/anie.200503334] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Giuseppe Battaglia
- Department of Engineering Materials, The Kroto Research Institute North Campus, University of Sheffield, Broad Lane, Sheffield, S3 7HQ, UK.
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Nabika H, Sasaki A, Takimoto B, Sawai Y, He S, Murakoshi K. Controlling molecular diffusion in self-spreading lipid bilayer using periodic array of ultra-small metallic architecture on solid surface. J Am Chem Soc 2006; 127:16786-7. [PMID: 16316215 DOI: 10.1021/ja0559597] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Diffusion of target molecules incorporated in the self-spreading lipid bilayer was controlled by the introduction of periodic array of metallic architecture on solid surface. Retardation of the progress of target molecules became significant when the size of gap between small metal architectures was less than a few hundred nanometers. The self-spreading dynamics of the lipid bilayer depending on the size of the small gap were analyzed semiquantitatively. Estimated change in the driving force of the spreading layer suggests that highly localized compression of the spreading layer causes selective segregation of molecules.
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Affiliation(s)
- Hideki Nabika
- Department of Chemistry, Graduate School of Science, Hokkaido University, Sapporo, Japan
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Suzuki K, Masuhara H. Groove-spanning behavior of lipid membranes on microfabricated silicon substrates. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:6487-94. [PMID: 15982057 DOI: 10.1021/la050157a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
We report on a spreading behavior of phospholipid membranes that arise from a lump of phospholipid (a lipid source) on topographically patterned substrates immersed in an aqueous solution. Microgrooves with well-defined shapes were prepared on Si111 surfaces by anisotropic etching in an alkaline solution. A spreading front that consists of membrane lobes and a single lipid bilayer was observed on the patterned silicon substrates by utilizing fluorescence interference contrast (FLIC) microscopy. FLIC images indicate that the membrane lobes span the microgrooves, while the underlying single lipid bilayer spread along the surface of the microgrooves. In fact, fluorescent polystyrene nanoparticles could be encapsulated in the microgrooves that were completely covered with the membrane lobes. The groove-spanning behavior of membrane lobes is discussed in terms of a balance between adhesion and bending energies of lipid bilayers.
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Affiliation(s)
- Kenji Suzuki
- Department of Applied Physics, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan.
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