1
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McClintic WT, Scott HL, Moore N, Farahat M, Maxwell M, Schuman CD, Bolmatov D, Barrera FN, Katsaras J, Collier CP. Heterosynaptic plasticity in biomembrane memristors controlled by pH. MRS BULLETIN 2022; 48:13-21. [PMID: 36908998 PMCID: PMC9988737 DOI: 10.1557/s43577-022-00344-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 05/02/2022] [Indexed: 05/12/2023]
Abstract
Abstract In biology, heterosynaptic plasticity maintains homeostasis in synaptic inputs during associative learning and memory, and initiates long-term changes in synaptic strengths that nonspecifically modulate different synapse types. In bioinspired neuromorphic circuits, heterosynaptic plasticity may be used to extend the functionality of two-terminal, biomimetic memristors. In this article, we explore how changes in the pH of droplet interface bilayer aqueous solutions modulate the memristive responses of a lipid bilayer membrane in the pH range 4.97-7.40. Surprisingly, we did not find conclusive evidence for pH-dependent shifts in the voltage thresholds (V*) needed for alamethicin ion channel formation in the membrane. However, we did observe a clear modulation in the dynamics of pore formation with pH in time-dependent, pulsed voltage experiments. Moreover, at the same voltage, lowering the pH resulted in higher steady-state currents because of increased numbers of conductive peptide ion channels in the membrane. This was due to increased partitioning of alamethicin monomers into the membrane at pH 4.97, which is below the pKa (~5.3-5.7) of carboxylate groups on the glutamate residues of the peptide, making the monomers more hydrophobic. Neutralization of the negative charges on these residues, under acidic conditions, increased the concentration of peptide monomers in the membrane, shifting the equilibrium concentrations of peptide aggregate assemblies in the membrane to favor greater numbers of larger, increasingly more conductive pores. It also increased the relaxation time constants for pore formation and decay, and enhanced short-term facilitation and depression of the switching characteristics of the device. Modulating these thresholds globally and independently of alamethicin concentration and applied voltage will enable the assembly of neuromorphic computational circuitry with enhanced functionality. Impact statement We describe how to use pH as a modulatory "interneuron" that changes the voltage-dependent memristance of alamethicin ion channels in lipid bilayers by changing the structure and dynamical properties of the bilayer. Having the ability to independently control the threshold levels for pore conduction from voltage or ion channel concentration enables additional levels of programmability in a neuromorphic system. In this article, we note that barriers to conduction from membrane-bound ion channels can be lowered by reducing solution pH, resulting in higher currents, and enhanced short-term learning behavior in the form of paired-pulse facilitation. Tuning threshold values with environmental variables, such as pH, provide additional training and learning algorithms that can be used to elicit complex functionality within spiking neural networks. Graphical abstract Supplementary information The online version contains supplementary material available at 10.1557/s43577-022-00344-z.
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Affiliation(s)
- William T. McClintic
- Bredesen Center for Interdisciplinary Research, The University of Tennessee, Knoxville, USA
| | - Haden L. Scott
- Large Scale Structures Group, Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, USA
| | - Nick Moore
- Department of Biochemistry & Cellular and Molecular Biology, The University of Tennessee, Knoxville, USA
| | - Mustafa Farahat
- Department of Chemical and Biomolecular Engineering, The University of Tennessee, Knoxville, USA
| | - Mikayla Maxwell
- Department of Biochemistry & Cellular and Molecular Biology, The University of Tennessee, Knoxville, USA
| | - Catherine D. Schuman
- Computer Science and Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, USA
| | - Dima Bolmatov
- Shull Wollan Center, Oak Ridge National Laboratory, Oak Ridge, USA
| | - Francisco N. Barrera
- Department of Biochemistry & Cellular and Molecular Biology, The University of Tennessee, Knoxville, USA
| | - John Katsaras
- Large Scale Structures Group, Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, USA
- Shull Wollan Center, Oak Ridge National Laboratory, Oak Ridge, USA
| | - C. Patrick Collier
- Bredesen Center for Interdisciplinary Research, The University of Tennessee, Knoxville, USA
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, USA
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2
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Tae H, Park S, Ma GJ, Cho NJ. Nanoarchitectured air-stable supported lipid bilayer incorporating sucrose-bicelle complex system. NANO CONVERGENCE 2022; 9:3. [PMID: 35015161 PMCID: PMC8752642 DOI: 10.1186/s40580-021-00292-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Accepted: 11/27/2021] [Indexed: 06/14/2023]
Abstract
Cell-membrane-mimicking supported lipid bilayers (SLBs) provide an ultrathin, self-assembled layer that forms on solid supports and can exhibit antifouling, signaling, and transport properties among various possible functions. While recent material innovations have increased the number of practically useful SLB fabrication methods, typical SLB platforms only work in aqueous environments and are prone to fluidity loss and lipid-bilayer collapse upon air exposure, which limits industrial applicability. To address this issue, herein, we developed sucrose-bicelle complex system to fabricate air-stable SLBs that were laterally mobile upon rehydration. SLBs were fabricated from bicelles in the presence of up to 40 wt% sucrose, which was verified by quartz crystal microbalance-dissipation (QCM-D) and fluorescence recovery after photobleaching (FRAP) experiments. The sucrose fraction in the system was an important factor; while 40 wt% sucrose induced lipid aggregation and defects on SLBs after the dehydration-rehydration process, 20 wt% sucrose yielded SLBs that exhibited fully recovered lateral mobility after these processes. Taken together, these findings demonstrate that sucrose-bicelle complex system can facilitate one-step fabrication of air-stable SLBs that can be useful for a wide range of biointerfacial science applications.
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Affiliation(s)
- Hyunhyuk Tae
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue 639798, Singapore, Singapore
| | - Soohyun Park
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue 639798, Singapore, Singapore
| | - Gamaliel Junren Ma
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue 639798, Singapore, Singapore
| | - Nam-Joon Cho
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue 639798, Singapore, Singapore.
- China-Singapore International Joint Research Institute (CSIJRI), Guangzhou, 510000, China.
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3
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Frampton MB, Yakoub D, Katsaras J, Zelisko PM, Marquardt D. A calorimetric, volumetric and combined SANS and SAXS study of hybrid siloxane phosphocholine bilayers. Chem Phys Lipids 2021; 241:105149. [PMID: 34627769 DOI: 10.1016/j.chemphyslip.2021.105149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Revised: 09/29/2021] [Accepted: 09/30/2021] [Indexed: 10/20/2022]
Abstract
Siloxanes are molecules used extensively in commercial, industrial, and biomedical applications. The inclusion of short siloxane chains into phospholipids results in interesting physical properties, including the ability to form low polydispersity unilamellar vesicles. As such, hybrid siloxane phosphocholines (SiPCs) have been examined as a potential platform for the delivery of therapeutic agents. Using small angle X-ray and neutron scattering, vibrating tube densitometry, and differential scanning calorimetry, we studied four hybrid SiPCs bilayers. Lipid volume measurements for the different SiPCs compared well with those previously determined for polyunsaturated PCs. Furthermore, the different SiPC's membrane thicknesses increased monotonically with temperature and, for the most part, consistent with the behavior observed in unsaturated lipids such as, 1-palmitoyl-2-docosahexaenoyl-sn-glycero-3-phosphocholine and 1-stearoyl-2-docosahexaenoyl-sn-glycero-3-phosphocholine, and the branched lipid 1,2-diphytanoyl-sn-glyerco-3-phosphocholine (DPhyPC).
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Affiliation(s)
- Mark B Frampton
- Department of Chemistry and Centre for Biotechnology, Brock University, St. Catharines, ON, Canada; Advanced Biomanufacturing Centre, Brock University, St. Catharines, ON, Canada; School of Biosciences, Loyalist College, Belleville, ON, Canada
| | - Doruntina Yakoub
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, ON, Canada
| | - John Katsaras
- Labs and Soft Matter Group, Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA; The Bredesen Center, University of Tennessee, Knoxville, TN, USA; Shull Wollan Center, Oak Ridge National Laboratory, Oak Ridge, TN, USA; Department of Physics, Brock University, St. Catharines, ON, Canada; Department of Physics and Astronomy, University of Tennessee, Knoxville, TN, USA
| | - Paul M Zelisko
- Department of Chemistry and Centre for Biotechnology, Brock University, St. Catharines, ON, Canada; Advanced Biomanufacturing Centre, Brock University, St. Catharines, ON, Canada
| | - Drew Marquardt
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, ON, Canada; Department of Physics, University of Windsor, Windsor, ON, Canada
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4
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Single Ion-Channel Analysis in Droplet Interface Bilayer. Methods Mol Biol 2020. [PMID: 32918738 DOI: 10.1007/978-1-0716-0806-7_14] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
Abstract
Droplet interface bilayer (DIB) is a method of fabricating lipid bilayer membrane by contacting two aqueous droplets coated with a monolayer of lipid molecules in oil media. Lipids coat the droplet surface either by vesicles fusing to the water-oil interface from the droplet side or diffusing toward the interface from the oil side, thereby forming a lipid monolayer. With the DIB technique, nanoliter amounts of aqueous solution is needed and one may obtain two different compositions of monolayers to form asymmetric bilayer which is difficult to replicate by other in vitro lipid membrane methods. Here, a DIB-based protocol is reported to fabricate a stable lipid bilayer membrane to perform single-channel electrophysiology on a pore-forming toxin.
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5
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Salvador-Castell M, Demé B, Oger P, Peters J. Structural Characterization of an Archaeal Lipid Bilayer as a Function of Hydration and Temperature. Int J Mol Sci 2020; 21:ijms21051816. [PMID: 32155764 PMCID: PMC7084678 DOI: 10.3390/ijms21051816] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Revised: 03/02/2020] [Accepted: 03/03/2020] [Indexed: 11/16/2022] Open
Abstract
Archaea, the most extremophilic domain of life, contain ether and branched lipids which provide extraordinary bilayer properties. We determined the structural characteristics of diether archaeal-like phospholipids as functions of hydration and temperature by neutron diffraction. Hydration and temperature are both crucial parameters for the self-assembly and physicochemical properties of lipid bilayers. In this study, we detected non-lamellar phases of archaeal-like lipids at low hydration levels, and lamellar phases at levels of 90% relative humidity or more exclusively. Moreover, at 90% relative humidity, a phase transition between two lamellar phases was discernible. At full hydration, lamellar phases were present up to 70ᵒC and no phase transition was observed within the temperature range studied (from 25 °C to 70 °C). In addition, we determined the neutron scattering length density and the bilayer's structural parameters from different hydration and temperature conditions. At the highest levels of hydration, the system exhibited rearrangements on its corresponding hydrophobic region. Furthermore, the water uptake of the lipids examined was remarkably high. We discuss the effect of ether linkages and branched lipids on the exceptional characteristics of archaeal phospholipids.
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Affiliation(s)
| | - Bruno Demé
- Institut Laue Langevin, 38000 Grenoble, France;
| | - Philippe Oger
- Université de Lyon, INSA de Lyon, CNRS, UMR 5240, 69211 Villeurbanne, France;
- Correspondence: (P.O.); (J.P.)
| | - Judith Peters
- Institut Laue Langevin, 38000 Grenoble, France;
- Université Grenoble Alpes, LiPhy, CNRS, 38000 Grenoble, France
- Correspondence: (P.O.); (J.P.)
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6
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Dynamical nonlinear memory capacitance in biomimetic membranes. Nat Commun 2019; 10:3239. [PMID: 31324794 PMCID: PMC6642212 DOI: 10.1038/s41467-019-11223-8] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2019] [Accepted: 05/27/2019] [Indexed: 11/08/2022] Open
Abstract
Two-terminal memory elements, or memelements, capable of co-locating signal processing and memory via history-dependent reconfigurability at the nanoscale are vital for next-generation computing materials striving to match the brain's efficiency and flexible cognitive capabilities. While memory resistors, or memristors, have been widely reported, other types of memelements remain underexplored or undiscovered. Here we report the first example of a volatile, voltage-controlled memcapacitor in which capacitive memory arises from reversible and hysteretic geometrical changes in a lipid bilayer that mimics the composition and structure of biomembranes. We demonstrate that the nonlinear dynamics and memory are governed by two implicitly-coupled, voltage-dependent state variables-membrane radius and thickness. Further, our system is capable of tuneable signal processing and learning via synapse-like, short-term capacitive plasticity. These findings will accelerate the development of low-energy, biomolecular neuromorphic memelements, which, in turn, could also serve as models to study capacitive memory and signal processing in neuronal membranes.
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7
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Allen-Benton M, Findlay HE, Booth PJ. Probing membrane protein properties using droplet interface bilayers. Exp Biol Med (Maywood) 2019; 244:709-720. [PMID: 31053046 PMCID: PMC6552395 DOI: 10.1177/1535370219847939] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
IMPACT STATEMENT The paper presents a comprehensive review of integral membrane protein studies utilizing droplet interface bilayers. Droplet interface bilayers are a novel method of constructing artificial lipid bilayers with enhanced stability and physicochemical complexity compared to existing methods. Their unique morphology also suggests applications in the construction of synthetic biological systems and protocells. As well as serving as a guide to in vitro membrane protein functional studies using droplet interface bilayers in the literature to date, a novel in vitro study of a flippase protein in a droplet interface bilayer is presented.
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Affiliation(s)
| | | | - Paula J Booth
- Department of Chemistry, King’s College London,
London SE1 1DB, UK
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8
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Characterization of self-assembled hybrid siloxane-phosphocholine bilayers. Chem Phys Lipids 2018; 216:1-8. [PMID: 30098944 DOI: 10.1016/j.chemphyslip.2018.07.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2018] [Revised: 07/24/2018] [Accepted: 07/31/2018] [Indexed: 01/25/2023]
Abstract
We have synthesized six new hybrid siloxane phosphocholines (SiPCs) and examined their self-assembly behaviour in aqueous dispersions. Employing small angle X-ray scattering we have characterized SiPC bilayers. SiPCs exhibit differential self-assembly behaviour that results from the interplay between the siloxane fatty acid in the sn-2 position and the differing chain length fatty acids in the sn-1 position. SiPCs that possess a fatty acid chain of a C8-C14 chain length in the sn-1 position form unilamellar vesicles. Extending the fatty acid chain length to C16 and C18 allows for the formation of both unilamellar and multilamellar vesicles. We propose that the preferential formation of unilamellar vesicles is the result of an enhanced hydrophobic effect imparted by siloxane chains at the termini of lipid tails.
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9
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Najem JS, Taylor GJ, Weiss RJ, Hasan MS, Rose G, Schuman CD, Belianinov A, Collier CP, Sarles SA. Memristive Ion Channel-Doped Biomembranes as Synaptic Mimics. ACS NANO 2018; 12:4702-4711. [PMID: 29578693 DOI: 10.1021/acsnano.8b01282] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Solid-state neuromorphic systems based on transistors or memristors have yet to achieve the interconnectivity, performance, and energy efficiency of the brain due to excessive noise, undesirable material properties, and nonbiological switching mechanisms. Here we demonstrate that an alamethicin-doped, synthetic biomembrane exhibits memristive behavior, emulates key synaptic functions including paired-pulse facilitation and depression, and enables learning and computing. Unlike state-of-the-art devices, our two-terminal, biomolecular memristor features similar structure (biomembrane), switching mechanism (ion channels), and ionic transport modality as biological synapses while operating at considerably lower power. The reversible and volatile voltage-driven insertion of alamethicin peptides into an insulating lipid bilayer creates conductive pathways that exhibit pinched current-voltage hysteresis at potentials above their insertion threshold. Moreover, the synapse-like dynamic properties of the biomolecular memristor allow for simplified learning circuit implementations. Low-power memristive devices based on stimuli-responsive biomolecules represent a major advance toward implementation of full synaptic functionality in neuromorphic hardware.
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Affiliation(s)
- Joseph S Najem
- Joint Institute for Biological Sciences , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States
- Department of Mechanical, Aerospace and Biomedical Engineering , University of Tennessee , Knoxville , Tennessee 37916 , United States
| | - Graham J Taylor
- Bredesen Center for Interdisciplinary Research , University of Tennessee , Knoxville , Tennessee 37996 , United States
- Department of Mechanical, Aerospace and Biomedical Engineering , University of Tennessee , Knoxville , Tennessee 37916 , United States
| | - Ryan J Weiss
- Department of Electrical Engineering and Computer Science , University of Tennessee , Knoxville , Tennessee 37916 , United States
| | - Md Sakib Hasan
- Department of Electrical Engineering and Computer Science , University of Tennessee , Knoxville , Tennessee 37916 , United States
| | - Garrett Rose
- Department of Electrical Engineering and Computer Science , University of Tennessee , Knoxville , Tennessee 37916 , United States
| | - Catherine D Schuman
- Computer Science and Mathematics Division , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States
| | - Alex Belianinov
- Center for Nanophase Materials Sciences , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States
| | - C Patrick Collier
- Center for Nanophase Materials Sciences , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States
| | - Stephen A Sarles
- Department of Mechanical, Aerospace and Biomedical Engineering , University of Tennessee , Knoxville , Tennessee 37916 , United States
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10
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Márquez IF, Vélez M. Formation of supported lipid bilayers of charged E. coli lipids on modified gold by vesicle fusion. MethodsX 2017; 4:461-468. [PMID: 29188189 PMCID: PMC5695534 DOI: 10.1016/j.mex.2017.11.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Accepted: 11/03/2017] [Indexed: 12/03/2022] Open
Abstract
We describe a simple way of fusing E. coli lipid vesicles onto a gold surface. Supported lipid bilayers on metal surfaces are interesting for several reasons: transducing a biological signal to an electric readout, using surface analytical tools such as Surface Plasmon Resonance (SPR), Infrared Reflection Absorption Spectroscopy, Neutron Reflectivity or Electrochemistry. The most widely used method to prepare supported lipid membranes is fusion of preexisting liposomes. It is quite efficient on hydrophilic surfaces such as glass, mica or SiO2, but vesicle fusion on metals and metal oxide surfaces (as gold, titanium oxide or indium tin oxide), remains a challenge, particularly for vesicles containing charged lipids, as is the case of bacterial lipids. We describe a simple method based on modifying the gold surface with a charged mercaptopropionic acid self-assembled monolayer and liposomes partially solubilized with detergent. The formed bilayers were characterized using a Quartz Crystal Microbalance with dissipation (QCM-D) and Atomic Force Microscopy (AFM). Some advantages of this protocol are that the stability of the self-assembled monolayer allows for repeated use of the substrate after detergent removal of the bilayer and that the amount of detergent required for optimal fusion can be determined previously using the lipid-detergent solubility curve.
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Affiliation(s)
- Ileana F Márquez
- Instituto de Catálisis y Petroleoquímica-CSIC, c/Marie Curie 2, Cantoblanco, Madrid 28049, Spain
| | - Marisela Vélez
- Instituto de Catálisis y Petroleoquímica-CSIC, c/Marie Curie 2, Cantoblanco, Madrid 28049, Spain
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11
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Agasid MT, Comi TJ, Saavedra SS, Aspinwall CA. Enhanced Temporal Resolution with Ion Channel-Functionalized Sensors Using a Conductance-Based Measurement Protocol. Anal Chem 2017; 89:1315-1322. [PMID: 27981836 PMCID: PMC5862562 DOI: 10.1021/acs.analchem.6b04226] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The binding of a target analyte to an ion channel (IC), which is readily detected electrochemically in a label-free manner with single-molecule selectivity and specificity, has generated widespread interest in using natural and engineered ICs as transducers in biosensing platforms. To date, the majority of developments in IC-functionalized sensing have focused on IC selectivity or sensitivity or development of suitable membrane environments and aperture geometries. Comparatively little work has addressed analytical performance criteria, particularly criteria required for temporal measurements of dynamic processes. We report a measurement protocol suitable for rapid, time-resolved monitoring (≤30 ms) of IC-modulated membrane conductance. Key features of this protocol include the reduction of membrane area and the use of small voltage steps (10 mV) and short duration voltage pulses (10 ms), which have the net effect of reducing the capacitive charging and decreasing the time required to achieve steady state currents. Application of a conductance protocol employing three sequential, 10 ms voltage steps (-10 mV, -20 mV, -30 mV) in an alternating, pyramid-like arrangement enabled sampling of membrane conductance every 30 ms. Using this protocol, dynamic IC measurements on black lipid membranes (BLMs) functionalized with gramicidin A were conducted using a fast perfusion system. BLM conductance decreased by 76 ± 7.5% within 30 ms of switching from solutions containing 0 to 1 M Ca2+, which demonstrates the feasibility of using this approach to monitor rapid, dynamic chemical processes. Rapid conductance measurements will be broadly applicable to IC-based sensors that undergo analyte-specific gating.
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Affiliation(s)
- Mark T. Agasid
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ 85721
| | - Troy J. Comi
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ 85721
| | - S. Scott Saavedra
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ 85721
- BIO5 Institute, University of Arizona, Tucson, AZ 85721
| | - Craig A. Aspinwall
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ 85721
- BIO5 Institute, University of Arizona, Tucson, AZ 85721
- Department of Biomedical Engineering, University of Arizona, Tucson, AZ 85721
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12
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Wang Y, Jiang L, Shen Q, Shen J, Han Y, Zhang H. Investigation on the self-assembled behaviors of C18unsaturated fatty acids in arginine aqueous solution. RSC Adv 2017. [DOI: 10.1039/c7ra06088b] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Self-assembled behaviors of UFAs in arginine solution have provided a theoretical basis for the application of two functional molecules in drug delivery.
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Affiliation(s)
- Yuxian Wang
- College of Chemistry and Molecular Engineering
- Nanjing Tech University
- Nanjing 211816
- China
| | - Ling Jiang
- College of Food Science and Light Industry
- Nanjing Tech University
- Nanjing 211816
- China
| | - Qinke Shen
- College of Chemistry and Molecular Engineering
- Nanjing Tech University
- Nanjing 211816
- China
| | - Jian Shen
- College of Chemistry and Molecular Engineering
- Nanjing Tech University
- Nanjing 211816
- China
| | - Yuwang Han
- College of Chemistry and Molecular Engineering
- Nanjing Tech University
- Nanjing 211816
- China
| | - Hongman Zhang
- College of Chemistry and Molecular Engineering
- Nanjing Tech University
- Nanjing 211816
- China
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13
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Lee J, Goh U, Lee HJ, Kim J, Jeong M, Park JH. Effective Retinal Penetration of Lipophilic and Lipid-Conjugated Hydrophilic Agents Delivered by Engineered Liposomes. Mol Pharm 2016; 14:423-430. [DOI: 10.1021/acs.molpharmaceut.6b00864] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Junsung Lee
- Bora Eye Hospital, Gwang-ju 61964, Republic of Korea
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14
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Niroomand H, Venkatesan GA, Sarles SA, Mukherjee D, Khomami B. Lipid-Detergent Phase Transitions During Detergent-Mediated Liposome Solubilization. J Membr Biol 2016; 249:523-38. [DOI: 10.1007/s00232-016-9894-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Accepted: 03/24/2016] [Indexed: 11/24/2022]
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15
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Grossutti M, Seenath R, Noël JA, Lipkowski J. Infrared and fluorescence spectroscopic studies of a phospholipid bilayer supported by a soft cationic hydrogel scaffold. J Colloid Interface Sci 2016; 473:162-71. [PMID: 27064742 DOI: 10.1016/j.jcis.2016.03.055] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Revised: 03/24/2016] [Accepted: 03/24/2016] [Indexed: 10/22/2022]
Abstract
Polarized attenuated total reflection (ATR-IR) spectroscopy and fluorescence microscopy techniques were used to characterize a 1,2-diphytanoyl-sn-glycero-3-phosphocholine (DPhPC) membrane supported on porous, cationic hydrogel beads. Fluorescence microscopy images showed that the DPhPC coated the external surface of the hydrogel scaffold. In addition, a fluorescence assay of the emission intensity of the Tb(3+)/dipicolinic acid complex demonstrated that the DPhPC coating acted as a barrier to Tb(3+) efflux from the scaffolded vesicle and successfully sealed the porous hydrogel bead. Fluorescence quenching and ATR-IR spectroscopic measurements revealed that the lipid coating has a bilayer structure. The phytanoyl chains were found to exhibit significant trans-gauche isomerization, characteristic of the fluid liquid phase. However, no lipid lateral mobility was observed by fluorescence recovery after photobleaching (FRAP) measurements. The phosphocholine headgroup was found to be well hydrated and oriented such that the cationic choline group tucked in behind the anionic phosphate group, consistent with an electrostatic attraction between the cationic scaffold and zwitterionic lipid. The absence of lipid lateral mobility may be due to the strength of this attraction.
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Affiliation(s)
- Michael Grossutti
- Department of Chemistry, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - Ryan Seenath
- Department of Chemistry, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - John A Noël
- Department of Chemistry, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - Jacek Lipkowski
- Department of Chemistry, University of Guelph, Guelph, Ontario N1G 2W1, Canada.
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16
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Lee J, Lee H, Goh U, Kim J, Jeong M, Lee J, Park JH. Cellular Engineering with Membrane Fusogenic Liposomes to Produce Functionalized Extracellular Vesicles. ACS APPLIED MATERIALS & INTERFACES 2016; 8:6790-6795. [PMID: 26954538 DOI: 10.1021/acsami.6b01315] [Citation(s) in RCA: 86] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Engineering of extracellular vesicles (EVs) without affecting biological functions remains a challenge, limiting the broad applications of EVs in biomedicine. Here, we report a method to equip EVs with various functional agents, including fluorophores, drugs, lipids, and bio-orthogonal chemicals, in an efficient and controlled manner by engineering parental cells with membrane fusogenic liposomes, while keeping the EVs intact. As a demonstration of how this method can be applied, we prepared EVs containing azide-lipids, and conjugated them with targeting peptides using copper-free click chemistry to enhance targeting efficacy to cancer cells. We believe that this liposome-based cellular engineering method will find utility in studying the biological roles of EVs and delivering therapeutic agents through their innate pathway.
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Affiliation(s)
- Junsung Lee
- Department of Bio and Brain Engineering, §Graduate School of Medical Science and Engineering, ⊥Institute for Health Science and Technology, and ∥Institute for the Nanocentury, Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141, Republic of Korea
| | - Hyoungjin Lee
- Department of Bio and Brain Engineering, §Graduate School of Medical Science and Engineering, ⊥Institute for Health Science and Technology, and ∥Institute for the Nanocentury, Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141, Republic of Korea
| | - Unbyeol Goh
- Department of Bio and Brain Engineering, §Graduate School of Medical Science and Engineering, ⊥Institute for Health Science and Technology, and ∥Institute for the Nanocentury, Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141, Republic of Korea
| | - Jiyoung Kim
- Department of Bio and Brain Engineering, §Graduate School of Medical Science and Engineering, ⊥Institute for Health Science and Technology, and ∥Institute for the Nanocentury, Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141, Republic of Korea
| | - Moonkyoung Jeong
- Department of Bio and Brain Engineering, §Graduate School of Medical Science and Engineering, ⊥Institute for Health Science and Technology, and ∥Institute for the Nanocentury, Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141, Republic of Korea
| | - Jean Lee
- Department of Bio and Brain Engineering, §Graduate School of Medical Science and Engineering, ⊥Institute for Health Science and Technology, and ∥Institute for the Nanocentury, Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141, Republic of Korea
| | - Ji-Ho Park
- Department of Bio and Brain Engineering, §Graduate School of Medical Science and Engineering, ⊥Institute for Health Science and Technology, and ∥Institute for the Nanocentury, Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141, Republic of Korea
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van Weerd J, Karperien M, Jonkheijm P. Supported Lipid Bilayers for the Generation of Dynamic Cell-Material Interfaces. Adv Healthc Mater 2015; 4:2743-79. [PMID: 26573989 DOI: 10.1002/adhm.201500398] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2015] [Revised: 08/03/2015] [Indexed: 12/13/2022]
Abstract
Supported lipid bilayers (SLB) offer unique possibilities for studying cellular membranes and have been used as a synthetic architecture to interact with cells. Here, the state-of-the-art in SLB-based technology is presented. The fabrication, analysis, characteristics and modification of SLBs are described in great detail. Numerous strategies to form SLBs on different substrates, and the means to patteren them, are described. The use of SLBs as model membranes for the study of membrane organization and membrane processes in vitro is highlighted. In addition, the use of SLBs as a substratum for cell analysis is presented, with discrimination between cell-cell and cell-extracellular matrix (ECM) mimicry. The study is concluded with a discussion of the potential for in vivo applications of SLBs.
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Affiliation(s)
- Jasper van Weerd
- Bioinspired Molecular Engineering; University of Twente; PO Box 217 7500 AE Enschede The Netherlands
- Dept. of Developmental BioEngineering; MIRA Institute for Biomedical Technology and Technical Medicine; University of Twente; PO Box 217 7500 AE Enschede The Netherlands
- Molecular Nanofabrication Group, MESA+; University of Twente; Enschede 7500 AE The Netherlands
| | - Marcel Karperien
- Dept. of Developmental BioEngineering; MIRA Institute for Biomedical Technology and Technical Medicine; University of Twente; PO Box 217 7500 AE Enschede The Netherlands
| | - Pascal Jonkheijm
- Bioinspired Molecular Engineering; University of Twente; PO Box 217 7500 AE Enschede The Netherlands
- Molecular Nanofabrication Group, MESA+; University of Twente; Enschede 7500 AE The Netherlands
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18
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Pawłowski J, Juhaniewicz J, Güzeloğlu A, Sęk S. Mechanism of Lipid Vesicles Spreading and Bilayer Formation on a Au(111) Surface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:11012-9. [PMID: 26010469 DOI: 10.1021/acs.langmuir.5b01331] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Spreading of small unilamellar vesicles on solid surfaces is one of the most common ways to obtain supported lipid bilayers. Although the method has been used successfully for many years, the details of this process are still the subject of intense debate. Particularly controversial is the mechanism of bilayer formation on metallic surfaces like gold. In this work, we have employed scanning probe microscopy techniques to evaluate the details of lipid vesicles spreading and formation of the lipid bilayer on a Au(111) surface in a phosphate-buffered saline solution. Nanoscale imaging revealed that the mechanism of this process differs significantly from that usually assumed for hydrophilic surfaces such as mica, glass, and silicon oxide. Formation of the bilayer on gold involves several steps. Initially, the vesicles accumulate on a gold surface and release lipid molecules that adsorb on a Au(111) surface, giving rise to the appearance of highly ordered stripelike domains. The latter serve as a template for the buildup of a hemimicellar film, which contributes to the increased hydrophilicity of the external surface and facilitates further adsorption and rupture of the vesicles. As a result, the bilayer is spread over a hemimicellar film, and then it is followed by slow fusion between coupled layers leading to formation of a single bilayer supported on a gold surface. We believe that the results presented in this work may provide some new insights into the area of research related to supported lipid bilayers.
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Affiliation(s)
- Jan Pawłowski
- Faculty of Chemistry, Biological and Chemical Research Centre, University of Warsaw , Żwirki i Wigury 101, 02-089 Warsaw, Poland
| | - Joanna Juhaniewicz
- Faculty of Chemistry, Biological and Chemical Research Centre, University of Warsaw , Żwirki i Wigury 101, 02-089 Warsaw, Poland
| | - Alişan Güzeloğlu
- Faculty of Chemistry, Biological and Chemical Research Centre, University of Warsaw , Żwirki i Wigury 101, 02-089 Warsaw, Poland
| | - Sławomir Sęk
- Faculty of Chemistry, Biological and Chemical Research Centre, University of Warsaw , Żwirki i Wigury 101, 02-089 Warsaw, Poland
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19
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Hoyo J, Guaus E, Torrent-Burgués J, Sanz F. Electrochemistry of LB films of mixed MGDG:UQ on ITO. Bioelectrochemistry 2015; 104:26-34. [DOI: 10.1016/j.bioelechem.2015.02.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2014] [Revised: 02/18/2015] [Accepted: 02/19/2015] [Indexed: 01/07/2023]
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20
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Damiati S, Schrems A, Sinner EK, Sleytr UB, Schuster B. Probing peptide and protein insertion in a biomimetic S-layer supported lipid membrane platform. Int J Mol Sci 2015; 16:2824-38. [PMID: 25633104 PMCID: PMC4346867 DOI: 10.3390/ijms16022824] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2014] [Revised: 01/08/2015] [Accepted: 01/22/2015] [Indexed: 11/17/2022] Open
Abstract
The most important aspect of synthetic lipid membrane architectures is their ability to study functional membrane-active peptides and membrane proteins in an environment close to nature. Here, we report on the generation and performance of a biomimetic platform, the S-layer supported lipid membrane (SsLM), to investigate the structural and electrical characteristics of the membrane-active peptide gramicidin and the transmembrane protein α-hemolysin in real-time using a quartz crystal microbalance with dissipation monitoring in combination with electrochemical impedance spectroscopy. A shift in membrane resistance is caused by the interaction of α-hemolysin and gramicidin with SsLMs, even if only an attachment onto, or functional channels through the lipid membrane, respectively, are formed. Moreover, the obtained results did not indicate the formation of functional α-hemolysin pores, but evidence for functional incorporation of gramicidin into this biomimetic architecture is provided.
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Affiliation(s)
- Samar Damiati
- Institute for Synthetic Bioarchitectures, Department of NanoBiotechnology, University of Natural Resources and Life Sciences, Muthgasse 11, Vienna 1190, Austria.
| | - Angelika Schrems
- Institute for Synthetic Bioarchitectures, Department of NanoBiotechnology, University of Natural Resources and Life Sciences, Muthgasse 11, Vienna 1190, Austria.
| | - Eva-Kathrin Sinner
- Institute for Synthetic Bioarchitectures, Department of NanoBiotechnology, University of Natural Resources and Life Sciences, Muthgasse 11, Vienna 1190, Austria.
| | - Uwe B Sleytr
- Institute for Biophysics, Department of NanoBiotechnology, University of Natural Resources and Life Sciences, Muthgasse 11, Vienna 1190, Austria.
| | - Bernhard Schuster
- Institute for Synthetic Bioarchitectures, Department of NanoBiotechnology, University of Natural Resources and Life Sciences, Muthgasse 11, Vienna 1190, Austria.
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21
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Polak A, Tarek M, Tomšič M, Valant J, Ulrih NP, Jamnik A, Kramar P, Miklavčič D. Structural properties of archaeal lipid bilayers: small-angle X-ray scattering and molecular dynamics simulation study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:8308-8315. [PMID: 25000416 DOI: 10.1021/la5014208] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Aeropyrum pernix is an aerobic hyperthermophilic archaeon that grows in harsh environmental conditions and as such possesses unique structural and metabolic features. Its membrane interfaces with the extreme environment and is the first line of defense from external factors. Therefore, lipids composing this membrane have special moieties that increase its stability. The membrane of A. pernix is composed predominantly of two polar lipids 2,3-di-O-sesterterpanyl-sn-glicerol-1-phospho-1'(2'-O-α-D-glucosyl)-myo-inositol (AGI) and 2,3-di-O-sesterterpanyl-sn-glicerol-1-phospho-myo-inositol (AI). Both have methyl branches in their lipid tails and ether linkages and carbohydrates in their headgroup. These moieties significantly affect the structure and dynamics of the bilayer. To provide a molecular level insight into these characteristics, we used here Molecular Dynamics (MD) simulations of lipid bilayers of composition similar to those of the archaeal membranes. First, we show that the electron density profiles along the normal to the bilayers derived from the simulations are in good agreement with the profiles obtained by the small-angle X-ray scattering (SAXS) technique, which provides confidence in the force fields used. Analyses of the simulation data show that the archaeal lipid bilayers are less hydrated than conventional phosphatidylcholine (PC) lipids and that their structure is not affected by the salt present in the surrounding solution. Furthermore, the lateral pressure in their hydrophobic core, due to the presence of the branched tails, is much higher than that at PC-based lipid bilayers. Both the methyl branched tails and the special headgroup moieties contribute to slow drastically the lateral diffusion of the lipids. Furthermore, we found that the lipid head groups associate via hydrogen bonding, which affects their reorientational dynamics. All together, our data provide links between the microscopic properties of these membranes and their overall stability in harsh environments.
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Affiliation(s)
- Andraž Polak
- Faculty of Electrical Engineering, University of Ljubljana , Tržaška cesta 25, SI-1000 Ljubljana, Slovenia
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Messina P, Lemaître F, Huet F, Ngo KA, Vivier V, Labbé E, Buriez O, Amatore C. Monitoring and Quantifying the Passive Transport of Molecules Through Patch-Clamp Suspended Real and Model Cell Membranes. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201308990] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Messina P, Lemaître F, Huet F, Ngo KA, Vivier V, Labbé E, Buriez O, Amatore C. Monitoring and quantifying the passive transport of molecules through patch-clamp suspended real and model cell membranes. Angew Chem Int Ed Engl 2014; 53:3192-6. [PMID: 24519879 DOI: 10.1002/anie.201308990] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2013] [Revised: 12/06/2013] [Indexed: 11/11/2022]
Abstract
Transport of active molecules across biological membranes is a central issue for the success of many pharmaceutical strategies. Herein, we combine the patch-clamp principle with amperometric detection for monitoring fluxes of redox-tagged molecular species across a suspended membrane patched from a macrophage. Solvent- and protein-free lipid bilayers (DPhPC, DOPC, DOPG) patched from single-wall GUV have been thoroughly investigated and the corresponding fluxes measurements quantified. The quality of the patches and their proper sealing were successfully characterized by electrochemical impedance spectroscopy. This procedure appears versatile and perfectly adequate to allow the investigation of transport and quantification of the transport properties through direct measurement of the coefficients of partition and diffusion of the compound in the membrane, thus offering insight on such important biological and pharmacological issues.
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Affiliation(s)
- Pierluca Messina
- Ecole Normale Supérieure, Département de Chimie, UMR CNRS-ENS-UPMC 8640 "PASTEUR", 24 rue Lhomond, 75231 Paris cedex 05 (France)
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24
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Wang S, Larson RG. Water channel formation and ion transport in linear and branched lipid bilayers. Phys Chem Chem Phys 2014; 16:7251-62. [DOI: 10.1039/c3cp55116d] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The lipid bilayer stability and water channel morphologies are affected by the presence of methyl branches on lipid tails.
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Affiliation(s)
- Shihu Wang
- Department of Chemical Engineering
- University of Michigan
- Ann Arbor, USA
| | - Ronald G. Larson
- Department of Chemical Engineering
- University of Michigan
- Ann Arbor, USA
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25
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Li X, Wang R, Wicaksana F, Zhao Y, Tang C, Torres J, Fane AG. Fusion behaviour of aquaporin Z incorporated proteoliposomes investigated by quartz crystal microbalance with dissipation (QCM-D). Colloids Surf B Biointerfaces 2013; 111:446-52. [DOI: 10.1016/j.colsurfb.2013.06.008] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2013] [Revised: 05/28/2013] [Accepted: 06/04/2013] [Indexed: 10/26/2022]
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