151
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Schaich M, Sobota D, Sleath H, Cama J, Keyser UF. Characterization of lipid composition and diffusivity in OLA generated vesicles. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2020; 1862:183359. [PMID: 32416194 PMCID: PMC7322398 DOI: 10.1016/j.bbamem.2020.183359] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Revised: 04/15/2020] [Accepted: 05/11/2020] [Indexed: 11/19/2022]
Abstract
Giant Unilamellar Vesicles (GUVs) are a versatile tool in many branches of science, including biophysics and synthetic biology. Octanol-Assisted Liposome Assembly (OLA), a recently developed microfluidic technique enables the production and testing of GUVs within a single device under highly controlled experimental conditions. It is therefore gaining significant interest as a platform for use in drug discovery, the production of artificial cells and more generally for controlled studies of the properties of lipid membranes. In this work, we expand the capabilities of the OLA technique by forming GUVs of tunable binary lipid mixtures of DOPC, DOPG and DOPE. Using fluorescence recovery after photobleaching we investigated the lateral diffusion coefficients of lipids in OLA liposomes and found the expected values in the range of 1 μm2/s for the lipid systems tested. We studied the OLA derived GUVs under a range of conditions and compared the results with electroformed vesicles. Overall, we found the lateral diffusion coefficients of lipids in vesicles obtained with OLA to be quantitatively similar to those in vesicles obtained via traditional electroformation. Our results provide a quantitative biophysical validation of the quality of OLA derived GUVs, which will facilitate the wider use of this versatile platform.
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Affiliation(s)
- Michael Schaich
- Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom
| | - Diana Sobota
- Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom
| | - Hannah Sleath
- Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom
| | - Jehangir Cama
- Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom; Living Systems Institute, University of Exeter, Stocker Road, Exeter EX4 4QD, United Kingdom; College of Engineering, Mathematics and Physical Sciences, University of Exeter, Harrison Building, Streatham Campus, North Park Road, Exeter EX4 4QF, United Kingdom.
| | - Ulrich F Keyser
- Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom.
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152
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Abstract
In nature, various specific reactions only occur in spatially controlled environments. Cell compartment and subcompartments act as the support required to preserve the bio-specificity and functionality of the biological content, by affording absolute segregation. Inspired by this natural perfect behavior, bottom-up approaches are on focus to develop artificial cell-like structures, crucial for understanding relevant bioprocesses and interactions or to produce tailored solutions in the field of therapeutics and diagnostics. In this review, we discuss the benefits of constructing polymer-based single and multicompartments (capsules and giant unilamellar vesicles (GUVs)), equipped with biomolecules as to mimic cells. In this respect, we outline key examples of how such structures have been designed from scratch, namely, starting from the application-oriented selection and synthesis of the amphiphilic block copolymer. We then present the state-of-the-art techniques for assembling the supramolecular structure while permitting the encapsulation of active compounds and the incorporation of peptides/membrane proteins, essential to support in situ reactions, e.g., to replicate intracellular signaling cascades. Finally, we briefly discuss important features that these compartments offer and how they could be applied to engineer the next generation of microreactors, therapeutic solutions, and cell models.
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153
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Moaven S, Watson BT, Thompson SB, Lyons VJ, Unruh DK, Casadonte DJ, Pappas D, Cozzolino AF. Self-assembly of reversed bilayer vesicles through pnictogen bonding: water-stable supramolecular nanocontainers for organic solvents. Chem Sci 2020; 11:4374-4380. [PMID: 33224458 PMCID: PMC7659706 DOI: 10.1039/d0sc00206b] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2020] [Accepted: 04/09/2020] [Indexed: 12/21/2022] Open
Abstract
A new air and moisture stable antimony thiolate compound has been prepared that spontaneously forms stable hollow vesicles. Structural data reveals that pnictogen bonding drives the self-assembly of these molecules into a reversed bilayer. The ability to make these hollow, spherical, and chemically and temporally stable vesicles that can be broken and reformed by sonication allows these systems to be used for encapsulation and compartmentalisation in organic media. This was demonstrated through the encapsulation and characterization of several small organic reporter molecules.
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Affiliation(s)
- Shiva Moaven
- Department of Chemistry and Biochemistry , Texas Tech University , Box 41061 , Lubbock , Texas 79409-1061 , USA .
| | - Brandon T Watson
- Department of Chemistry and Biochemistry , Texas Tech University , Box 41061 , Lubbock , Texas 79409-1061 , USA .
| | - Shelby B Thompson
- Department of Chemistry and Biochemistry , Texas Tech University , Box 41061 , Lubbock , Texas 79409-1061 , USA .
| | - Veronica J Lyons
- Department of Chemistry and Biochemistry , Texas Tech University , Box 41061 , Lubbock , Texas 79409-1061 , USA .
| | - Daniel K Unruh
- Department of Chemistry and Biochemistry , Texas Tech University , Box 41061 , Lubbock , Texas 79409-1061 , USA .
| | - Dominick J Casadonte
- Department of Chemistry and Biochemistry , Texas Tech University , Box 41061 , Lubbock , Texas 79409-1061 , USA .
| | - Dimitri Pappas
- Department of Chemistry and Biochemistry , Texas Tech University , Box 41061 , Lubbock , Texas 79409-1061 , USA .
| | - Anthony F Cozzolino
- Department of Chemistry and Biochemistry , Texas Tech University , Box 41061 , Lubbock , Texas 79409-1061 , USA .
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154
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Kunzler C, Handschuh‐Wang S, Roesener M, Schönherr H. Giant Biodegradable Poly(ethylene glycol)‐
block
‐Poly(ε‐caprolactone) Polymersomes by Electroformation. Macromol Biosci 2020; 20:e2000014. [DOI: 10.1002/mabi.202000014] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2020] [Revised: 04/03/2020] [Indexed: 11/11/2022]
Affiliation(s)
- Cleiton Kunzler
- Physical Chemistry I and Research Center of Micro and Nanochemistry and Engineering (Cµ)Department of Chemistry and BiologyUniversity of Siegen Adolf‐Reichwein‐Str. 2 Siegen 57076 Germany
- Macromolecular ChemistryDepartment of Chemistry and BiologyUniversity of Siegen Adolf‐Reichwein‐Str. 2 Siegen 57076 Germany
| | - Stephan Handschuh‐Wang
- Physical Chemistry I and Research Center of Micro and Nanochemistry and Engineering (Cµ)Department of Chemistry and BiologyUniversity of Siegen Adolf‐Reichwein‐Str. 2 Siegen 57076 Germany
| | - Manuel Roesener
- Physical Chemistry I and Research Center of Micro and Nanochemistry and Engineering (Cµ)Department of Chemistry and BiologyUniversity of Siegen Adolf‐Reichwein‐Str. 2 Siegen 57076 Germany
| | - Holger Schönherr
- Physical Chemistry I and Research Center of Micro and Nanochemistry and Engineering (Cµ)Department of Chemistry and BiologyUniversity of Siegen Adolf‐Reichwein‐Str. 2 Siegen 57076 Germany
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155
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Boban Z, Puljas A, Kovač D, Subczynski WK, Raguz M. Effect of Electrical Parameters and Cholesterol Concentration on Giant Unilamellar Vesicles Electroformation. Cell Biochem Biophys 2020; 78:157-164. [PMID: 32319021 DOI: 10.1007/s12013-020-00910-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Accepted: 03/30/2020] [Indexed: 10/23/2022]
Abstract
Giant unilamellar vesicles (GUVs) are used extensively as models that mimic cell membranes. The cholesterol (Chol) content in the fiber cell plasma membranes of the eye lens is extremely high, exceeding the solubility threshold in the lenses of old humans. Thus, a methodological paper pertaining to preparations of model lipid bilayer membranes with high Chol content would significantly help the study of properties of these membranes. Lipid solutions containing 1-palmitoyl-2-oleoyl-glycero-3-phosphocholine (POPC) and Chol were fluorescently labeled with phospholipid analog 1,1'-dioctadecyl-3,3,3',3'-tetramethylindocarbocyanine perchlorate (DiIC18(3)) and spin-coated to produce thin lipid films. GUVs were formed from these films using the electroformation method and the results were obtained using fluorescent microscopy. Electroformation outcomes were examined for different electrical parameters and different Chol concentrations. A wide range of field frequency-field strength (ff-fs) combinations was explored: 10-10,000 Hz and 0.625-9.375 V/mm peak-to-peak. Optimal values for GUVs preparation were found to be 10-100 Hz and 1.25-6.25 V/mm, with largest vesicles occurring for 10 Hz and 3.75 V/mm. Chol:POPC mixing ratios (expressed as a molar ratio) ranged from 0 to 3.5. We show that increasing the Chol concentration decreases the GUVs size, but this effect can be reduced by choosing the appropriate ff-fs combination.
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Affiliation(s)
- Zvonimir Boban
- Department of Medical Physics and Biophysics, University of Split School of Medicine, Split, Croatia.,University of Split, Faculty of Science, Doctoral study of Biophysics, Split, Croatia
| | - Ana Puljas
- Department of Medical Physics and Biophysics, University of Split School of Medicine, Split, Croatia
| | - Dubravka Kovač
- Department of Physics, Faculty of Science, University of Split, Split, Croatia
| | | | - Marija Raguz
- Department of Medical Physics and Biophysics, University of Split School of Medicine, Split, Croatia.
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156
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Mizuguchi T, Momotake A, Hishida M, Yasui M, Yamamoto Y, Saiki T, Nuriya M. Multimodal Multiphoton Imaging of the Lipid Bilayer by Dye-Based Sum-Frequency Generation and Coherent Anti-Stokes Raman Scattering. Anal Chem 2020; 92:5656-5660. [PMID: 32202108 DOI: 10.1021/acs.analchem.0c00673] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Coherent anti-Stokes Raman scattering (CARS) imaging is widely used for imaging molecular vibrations inside cells and tissues. Lipid bilayers are potential analytes for CARS imaging due to their abundant CH2 vibrational bonds. However, identifying the plasma membrane is challenging since it possesses a thin structure and is closely apposed to lipid structures inside the cells. Since the plasma membrane provides the most prominent asymmetric location within cells, orientation sensitive sum-frequency generation (SFG) imaging is a promising technique for selective visualization of the plasma membrane labeled by a nonfluorescent and SFG-specific dye, Ap3, when using a CARS microscope system. In this study, we closely compare the characteristics of lipid bilayer imaging by dye-based SFG and CARS using giant vesicles (GVs) and N27 rat dopaminergic neural cells. As a result, we show that CARS imaging can be exploited for the visualization of whole lipid structures inside GVs and cells but is insufficient for identification of the plasma membrane, which instead can be achieved using dye-based SFG imaging. In addition, we demonstrate that these unique properties can be combined and applied to the live-cell tracking of intracellular lipid structures such as lipid droplets beneath the plasma membrane. Thus, multimodal multiphoton imaging through a combination of dye-based SFG and CARS can serve as a powerful chemical imaging tool to investigate lipid bilayers in GVs and living cells.
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Affiliation(s)
- Takaha Mizuguchi
- Department of Pharmacology School of Medicine, Keio University, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan.,Graduate School of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
| | - Atsuya Momotake
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
| | - Mafumi Hishida
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
| | - Masato Yasui
- Department of Pharmacology School of Medicine, Keio University, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan.,Keio Advanced Research Center for Water Biology and Medicine, Keio University, 2-15-45 Mita, Minato-ku, Tokyo 108-8345, Japan
| | - Yasuhiko Yamamoto
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
| | - Toshiharu Saiki
- Graduate School of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
| | - Mutsuo Nuriya
- Department of Pharmacology School of Medicine, Keio University, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan.,Keio Advanced Research Center for Water Biology and Medicine, Keio University, 2-15-45 Mita, Minato-ku, Tokyo 108-8345, Japan.,Graduate School of Environment and Information Sciences, Yokohama National University, Kanagawa 240-8501, Japan.,Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012, Japan
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157
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Mohanan G, Nair KS, Nampoothiri KM, Bajaj H. Engineering bio-mimicking functional vesicles with multiple compartments for quantifying molecular transport. Chem Sci 2020; 11:4669-4679. [PMID: 34122921 PMCID: PMC8159255 DOI: 10.1039/d0sc00084a] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Controlled design of giant unilamellar vesicles under defined conditions has vast applications in the field of membrane and synthetic biology. Here, we bio-engineer bacterial-membrane mimicking models of controlled size under defined salt conditions over a range of pH. A complex bacterial lipid extract is used for construction of physiologically relevant Gram-negative membrane mimicking vesicles whereas a ternary mixture of charged lipids (DOPG, cardiolipin and lysyl-PG) is used for building Gram-positive bacterial-membrane vesicles. Furthermore, we construct stable multi-compartment biomimicking vesicles using the gel-assisted swelling method. Importantly, we validate the bio-application of the bacterial vesicle models by quantifying diffusion of chemically synthetic amphoteric antibiotics. The transport rate is pH-responsive and depends on the lipid composition, based on which a permeation model is proposed. The permeability properties of antimicrobial peptides reveal pH dependent pore-forming activity in the model vesicles. Finally, we demonstrate the functionality of the vesicles by quantifying the uptake of membrane-impermeable molecules facilitated by embedded pore-forming proteins. We suggest that the bacterial vesicle models developed here can be used to understand fundamental biological processes like the peptide assembly mechanism or bacterial cell division and will have a multitude of applications in the bottom-up assembly of a protocell. Giant vesicle functional models mimicking a bacterial membrane under physiological conditions are constructed.![]()
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Affiliation(s)
- Gayathri Mohanan
- Microbial Processes and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (NIIST) Trivandrum 695019 Kerala India
| | - Karthika S Nair
- Microbial Processes and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (NIIST) Trivandrum 695019 Kerala India
| | - K Madhavan Nampoothiri
- Microbial Processes and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (NIIST) Trivandrum 695019 Kerala India
| | - Harsha Bajaj
- Microbial Processes and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (NIIST) Trivandrum 695019 Kerala India
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158
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Vasti C, Ambroggio E, Rojas R, Giacomelli CE. A closer look into the physical interactions between lipid membranes and layered double hydroxide nanoparticles. Colloids Surf B Biointerfaces 2020; 191:110998. [PMID: 32244154 DOI: 10.1016/j.colsurfb.2020.110998] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2019] [Revised: 02/21/2020] [Accepted: 03/24/2020] [Indexed: 12/22/2022]
Abstract
Layered double hydroxide nanoparticles (LDH-NPs) constitute promising nanocarriers for drug and gene delivery. Although their cell internalization has been studied, the interaction between LDH-NPs and biological membrane models, such as giant unilamellar vesicles (GUVs), remains unexplored. These vesicles are widely-used membrane models that allow minimizing the complexity and uncertainty associated with biological systems to study the physical interactions in the absence of cell metabolism effects. With such an approach the physicochemical properties of the membrane can be differentiated from the biological functionalities involved in cell internalization and the membrane-mediated internalization can be directly understood. In this work, we describe for the first time the interaction of LDH-NPs with freestanding negatively charged POPC:POPS GUVs by fluorescence microscopy. The experiments were performed with fluorescein labeled LDH-NPs of about 100 nm together with different fluorophores in order to evaluate the NPs interactions with the vesicles as well as their impact on the membrane morphology and permeability. Positively charged LDH-NPs are electrostatically accumulated at the GUVs membrane, altering its lateral phospholipid distribution and increasing the stiffness and permeability of the membrane. The adsorption of albumin (LDH@ALB) or polyacrylic acid (LDH@PA) passivates the surface of LDH-NPs eliminating long-range electrostatic attraction. The absence of membrane-mediated internalization of either LDH@ALB or LDH@PA, represents an advantage in the use of LDH-NPs as drug or nucleic acids nanocarriers, because suitable functionalization will allow an optimal cell targeting.
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Affiliation(s)
- Cecilia Vasti
- Universidad Nacional de Córdoba. Facultad de Ciencias Químicas, Departamento de Fisicoquímica, CONICET, INFIQC, Ciudad Universitaria, X5000HUA, Córdoba, Argentina
| | - Ernesto Ambroggio
- Departamento de Química Biológica Ranwel Caputto, CONICET, CIQUIBIC, Ciudad Universitaria, X5000HUA, Córdoba, Argentina
| | - Ricardo Rojas
- Universidad Nacional de Córdoba. Facultad de Ciencias Químicas, Departamento de Fisicoquímica, CONICET, INFIQC, Ciudad Universitaria, X5000HUA, Córdoba, Argentina.
| | - Carla E Giacomelli
- Universidad Nacional de Córdoba. Facultad de Ciencias Químicas, Departamento de Fisicoquímica, CONICET, INFIQC, Ciudad Universitaria, X5000HUA, Córdoba, Argentina.
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159
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Moghal MMR, Hossain F, Yamazaki M. Action of antimicrobial peptides and cell-penetrating peptides on membrane potential revealed by the single GUV method. Biophys Rev 2020; 12:339-348. [PMID: 32152921 PMCID: PMC7242587 DOI: 10.1007/s12551-020-00662-z] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Accepted: 02/23/2020] [Indexed: 02/06/2023] Open
Abstract
Membrane potential plays various key roles in live bacterial and eukaryotic cells. So far, the effects of membrane potential on action of antimicrobial peptides (AMPs) and cell-penetrating peptides (CPPs) have been examined using cells and small lipid vesicles. However, due to the technical drawbacks of these experiments, the effect of membrane potential on the actions of AMPs and CPPs and the elementary processes of interactions of these peptides with cell membranes and vesicle membranes are not well understood. In this short review, we summarize the results of the effect of membrane potential on the action of an AMP, lactoferricin B (LfcinB), and a CPP, transportan 10 (TP10), in vesicle membranes revealed by the single giant unilamellar vesicle (GUV) method. Parts of the actions and their elementary steps of AMPs and CPPs interacting vesicle membranes under membrane potential are clearly revealed using the single GUV method. The experimental methods and their analysis described here can be used to elucidate the effects of membrane potential on various activities of peptides such as AMPs, CPPs, and proteins. Moreover, GUVs with membrane potential are more suitable as a model of cells or artificial cells, as well as GUVs containing small vesicles.
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Affiliation(s)
- Md Mizanur Rahman Moghal
- Integrated Bioscience Section, Graduate School of Science and Technology, Shizuoka University, Shizuoka, 422-8529, Japan
- Department of Pharmacy, Mawlana Bhashani Science and Technology University, Tangail, 1902, Bangladesh
| | - Farzana Hossain
- Integrated Bioscience Section, Graduate School of Science and Technology, Shizuoka University, Shizuoka, 422-8529, Japan
| | - Masahito Yamazaki
- Integrated Bioscience Section, Graduate School of Science and Technology, Shizuoka University, Shizuoka, 422-8529, Japan.
- Nanomaterials Research Division, Research Institute of Electronics, Shizuoka University, 836 Oya, Suruga-ku, Shizuoka, 422-8529, Japan.
- Department of Physics, Faculty of Science, Shizuoka University, Shizuoka, 422-8529, Japan.
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160
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Abstract
The combination of supramolecular functional systems with biomolecular chemistry has been a fruitful exercise for decades, leading to a greater understanding of biomolecules and to a great variety of applications, for example, in drug delivery and sensing. Within these developments, the phospholipid bilayer membrane, surrounding live cells, with all its functions has also intrigued supramolecular chemists. Herein, recent efforts from the supramolecular chemistry community to mimic natural functions of lipid membranes, such as sensing, molecular recognition, membrane fusion, signal transduction, and gated transport, are reviewed.
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Affiliation(s)
- Andrea Barba‐Bon
- Department of Life Sciences and ChemistryJacobs University BremenCampus Ring 128759BremenGermany
| | - Mohamed Nilam
- Department of Life Sciences and ChemistryJacobs University BremenCampus Ring 128759BremenGermany
| | - Andreas Hennig
- Department of Life Sciences and ChemistryJacobs University BremenCampus Ring 128759BremenGermany
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161
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Parigoris E, Dunkelmann DL, Murphy A, Wili N, Kaech A, Dumrese C, Jimenez-Rojo N, Silvan U. Facile generation of giant unilamellar vesicles using polyacrylamide gels. Sci Rep 2020; 10:4824. [PMID: 32179778 PMCID: PMC7075891 DOI: 10.1038/s41598-020-61655-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Accepted: 12/23/2019] [Indexed: 12/30/2022] Open
Abstract
Giant unilamellar vesicles (GUVs) are model cell-sized systems that have broad applications including drug delivery, analysis of membrane biophysics, and synthetic reconstitution of cellular machineries. Although numerous methods for the generation of free-floating GUVs have been established over the past few decades, only a fraction have successfully produced uniform vesicle populations both from charged lipids and in buffers of physiological ionic strength. In the method described here, we generate large numbers of free-floating GUVs through the rehydration of lipid films deposited on soft polyacrylamide (PAA) gels. We show that this technique produces high GUV concentrations for a range of lipid types, including charged ones, independently of the ionic strength of the buffer used. We demonstrate that the gentle hydration of PAA gels results in predominantly unilamellar vesicles, which is in contrast to comparable methods analyzed in this work. Unilamellarity is a defining feature of GUVs and the generation of uniform populations is key for many downstream applications. The PAA method is widely applicable and can be easily implemented with commonly utilized laboratory reagents, making it an appealing platform for the study of membrane biophysics.
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Affiliation(s)
- Eric Parigoris
- University Hospital Balgrist, University of Zurich, Zürich, Switzerland.,Institute for Biomechanics, ETH Zurich, Zürich, Switzerland.,Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, USA
| | | | - Allan Murphy
- University Hospital Balgrist, University of Zurich, Zürich, Switzerland.,Institute for Biomechanics, ETH Zurich, Zürich, Switzerland
| | - Nino Wili
- Laboratory of Physical Chemistry, ETH Zurich, Zürich, Switzerland
| | - Andres Kaech
- Center for Microscopy and Image Analysis, University of Zurich, Zurich, Switzerland
| | - Claudia Dumrese
- Flow Cytometry Facility, University of Zurich, Zurich, Switzerland
| | - Noemi Jimenez-Rojo
- NCCR Chemical Biology, Department of Biochemistry, University of Geneva, Geneva, Switzerland
| | - Unai Silvan
- University Hospital Balgrist, University of Zurich, Zürich, Switzerland. .,Institute for Biomechanics, ETH Zurich, Zürich, Switzerland.
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162
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Hindley JW, Law RV, Ces O. Membrane functionalization in artificial cell engineering. SN APPLIED SCIENCES 2020. [DOI: 10.1007/s42452-020-2357-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
AbstractBottom-up synthetic biology aims to construct mimics of cellular structure and behaviour known as artificial cells from a small number of molecular components. The development of this nascent field has coupled new insights in molecular biology with large translational potential for application in fields such as drug delivery and biosensing. Multiple approaches have been applied to create cell mimics, with many efforts focusing on phospholipid-based systems. This mini-review focuses on different approaches to incorporating molecular motifs as tools for lipid membrane functionalization in artificial cell construction. Such motifs range from synthetic chemical functional groups to components from extant biology that can be arranged in a ‘plug-and-play’ approach which is hard to replicate in living systems. Rationally designed artificial cells possess the promise of complex biomimetic behaviour from minimal, highly engineered chemical networks.
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163
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Miele Y, Medveczky Z, Holló G, Tegze B, Derényi I, Hórvölgyi Z, Altamura E, Lagzi I, Rossi F. Self-division of giant vesicles driven by an internal enzymatic reaction. Chem Sci 2020; 11:3228-3235. [PMID: 34122829 PMCID: PMC8157745 DOI: 10.1039/c9sc05195c] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Accepted: 01/08/2020] [Indexed: 12/16/2022] Open
Abstract
Self-division is one of the most common phenomena in living systems and one of the most important properties of life driven by internal mechanisms of cells. Design and engineering of synthetic cells from abiotic components can recreate a life-like function thus contributing to the understanding of the origin of life. Existing methods to induce the self-division of vesicles require external and non-autonomous triggers (temperature change and the addition of membrane precursors). Here we show that pH-responsive giant unilamellar vesicles on the micrometer scale can undergo self-division triggered by an internal autonomous chemical stimulus driven by an enzymatic (urea-urease) reaction coupled to a cross-membrane transport of the substrate, urea. The bilayer of the artificial cells is composed of a mixture of phospholipids (POPC, 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphatidylcholine) and oleic acid molecules. The enzymatic reaction increases the pH in the lumen of the vesicles, which concomitantly changes the protonation state of the oleic acid in the inner leaflet of the bilayer causing the removal of the membrane building blocks into the lumen of the vesicles thus decreasing the inner membrane area with respect to the outer one. This process coupled to the osmotic stress (responsible for the volume loss of the vesicles) leads to the division of a mother vesicle into two smaller daughter vesicles. These two processes must act in synergy; none of them alone can induce the division. Overall, our self-dividing system represents a step forward in the design and engineering of a complex autonomous model of synthetic cells.
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Affiliation(s)
- Ylenia Miele
- Department of Chemistry and Biology "A. Zambelli", University of Salerno Via Giovanni Paolo II 132, 84084 - Fisciano SA Italy
| | - Zsófia Medveczky
- Department of Physics, Budapest University of Technology and Economics H-1111, Budafoki ut 8 Budapest Hungary
| | - Gábor Holló
- MTA-BME Condensed Matter Research Group, Budapest University of Technology and Economics H-1111, Budafoki út 8 Budapest Hungary
| | - Borbála Tegze
- Department of Physical Chemistry and Materials Science, Budapest University of Technology and Economics H-1111 Budafoki ut 8 Budapest Hungary
| | - Imre Derényi
- Department of Biological Physics, Eötvös Loránd University H-1117 Pázmány Péter sétány 1/A Budapest Hungary
- MTA-ELTE Statistical and Biological Physics Research Group, Eötvös Loránd University H-1117 Pázmány Péter sétány 1/A Budapest Hungary
| | - Zoltán Hórvölgyi
- Department of Physical Chemistry and Materials Science, Budapest University of Technology and Economics H-1111 Budafoki ut 8 Budapest Hungary
| | - Emiliano Altamura
- Department of Chemistry, University of Bari, "Aldo Moro" Via Orabona 4 I-70125 Bari Italy
| | - István Lagzi
- Department of Physics, Budapest University of Technology and Economics H-1111, Budafoki ut 8 Budapest Hungary
- MTA-BME Condensed Matter Research Group, Budapest University of Technology and Economics H-1111, Budafoki út 8 Budapest Hungary
| | - Federico Rossi
- Department of Chemistry and Biology "A. Zambelli", University of Salerno Via Giovanni Paolo II 132, 84084 - Fisciano SA Italy
- Department of Earth, Environmental and Physical Sciences - DEEP Sciences, University of Siena Pian dei Mantellini 44 53100 - Siena Italy
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164
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Hao T, Tan H, Li S, Wang Y, Zhou Z, Yu C, Zhou Y, Yan D. Multilayer onion‐like vesicles self‐assembled from amphiphilic hyperbranched multiarm copolymers via simulation. JOURNAL OF POLYMER SCIENCE 2020. [DOI: 10.1002/pol.20190163] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Tongfan Hao
- School of Chemistry and Chemical Engineering, Shanghai Key Laboratory of Electrical Insulation and Thermal Aging, State Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong University Shanghai China
- Institute of Green Chemistry and Chemical Technology, School of Chemistry and Chemical EngineeringJiangsu University Zhenjiang China
| | - Haina Tan
- School of Chemistry and Chemical Engineering, Shanghai Key Laboratory of Electrical Insulation and Thermal Aging, State Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong University Shanghai China
| | - Shanlong Li
- School of Chemistry and Chemical Engineering, Shanghai Key Laboratory of Electrical Insulation and Thermal Aging, State Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong University Shanghai China
| | - Yuling Wang
- School of Chemistry and Chemical Engineering, Shanghai Key Laboratory of Electrical Insulation and Thermal Aging, State Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong University Shanghai China
| | - Zhiping Zhou
- Institute of Polymer Materials, School of Materials Science and EngineeringJiangsu University Zhenjiang China
| | - Chunyang Yu
- School of Chemistry and Chemical Engineering, Shanghai Key Laboratory of Electrical Insulation and Thermal Aging, State Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong University Shanghai China
| | - Yongfeng Zhou
- School of Chemistry and Chemical Engineering, Shanghai Key Laboratory of Electrical Insulation and Thermal Aging, State Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong University Shanghai China
| | - Deyue Yan
- School of Chemistry and Chemical Engineering, Shanghai Key Laboratory of Electrical Insulation and Thermal Aging, State Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong University Shanghai China
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165
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Zhou YM, Liu XC, Li YQ, Wang P, Han RM, Zhang JP, Skibsted LH. Synergy between plant phenols and carotenoids in stabilizing lipid-bilayer membranes of giant unilamellar vesicles against oxidative destruction. SOFT MATTER 2020; 16:1792-1800. [PMID: 31970380 DOI: 10.1039/c9sm01415b] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We have investigated the synergism between plant phenols and carotenoids in protecting the phosphatidylcholine (PC) membranes of giant unilamellar vesicles (GUVs) from oxidative destruction, for which chlorophyll-a (Chl-a) was used as a lipophilic photosensitizer. The effect was examined for seven different combinations of β-carotene (β-CAR) and plant phenols. The light-induced change in GUV morphology was monitored via conventional optical microscopy, and quantified by a dimensionless image-entropy parameter, ΔE. The ΔE-t time evolution profiles exhibiting successive lag phase, budding phase and ending phase could be accounted for by a Boltzmann model function. The length of the lag phase (LP in s) for the combination of syringic acid and β-CAR was more than seven fold longer than for β-CAR alone, and those for other different combinations followed the order: salicylic acid < vanillic acid < syringic acid > rutin > caffeic acid > quercetin > catechin, indicating that moderately reducing phenols appeared to be the most efficient membrane co-stabilizers. The same order held for the residual contents of β-CAR in membranes after light-induced oxidative degradation as determined by resonance Raman spectroscopy. The dependence of LP on the reducing power of phenols coincided with the Marcus theory plot for the rate of electron transfer from phenols to the radical cation β-CAR˙+ as a primary oxidative product, suggesting that the plant phenol regeneration of β-CAR plays an important role in stabilizing the GUV membranes, as further supported by the involvement of CAR˙+ and the distinct shortening of its lifetime as shown by transient absorption spectroscopy.
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Affiliation(s)
- Yi-Ming Zhou
- Department of Chemistry, Renmin University of China, Beijing, 100872, China.
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166
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Controlled Peptide-Mediated Vesicle Fusion Assessed by Simultaneous Dual-Colour Time-Lapsed Fluorescence Microscopy. Sci Rep 2020; 10:3087. [PMID: 32080270 PMCID: PMC7033240 DOI: 10.1038/s41598-020-59926-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Accepted: 01/31/2020] [Indexed: 12/03/2022] Open
Abstract
We have employed a model system, inspired by SNARE proteins, to facilitate membrane fusion between Giant Unilamellar Vesicles (GUVs) and Large Unilamellar Vesicles (LUVs) under physiological conditions. In this system, two synthetic lipopeptide constructs comprising the coiled-coil heterodimer-forming peptides K4, (KIAALKE)4, or E4, (EIAALEK)4, a PEG spacer of variable length, and a cholesterol moiety to anchor the peptides into the liposome membrane replace the natural SNARE proteins. GUVs are functionalized with one of the lipopeptide constructs and the fusion process is triggered by adding LUVs bearing the complementary lipopeptide. Dual-colour time lapse fluorescence microscopy was used to visualize lipid- and content-mixing. Using conventional confocal microscopy, lipid mixing was observed on the lipid bilayer of individual GUVs. In addition to lipid-mixing, content-mixing assays showed a low efficiency due to clustering of K4-functionalized LUVs on the GUVs target membranes. We showed that, through the use of the non-ionic surfactant Tween 20, content-mixing between GUVs and LUVs could be improved, meaning this system has the potential to be employed for drug delivery in biological systems.
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167
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Tripepi M, Ferrauto G, Bennardi PO, Aime S, Delli Castelli D. Multilamellar LipoCEST Agents Obtained from Osmotic Shrinkage of Paramagnetically Loaded Giant Unilamellar Vescicles (GUVs). Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201912327] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Martina Tripepi
- Department of Molecular Biotechnology and Health SciencesUniversity of Torino Via Nizza 52 10126 Torino Italy
| | - Giuseppe Ferrauto
- Department of Molecular Biotechnology and Health SciencesUniversity of Torino Via Nizza 52 10126 Torino Italy
| | - Paolo Oronzo Bennardi
- Department of Molecular Biotechnology and Health SciencesUniversity of Torino Via Nizza 52 10126 Torino Italy
| | - Silvio Aime
- Department of Molecular Biotechnology and Health SciencesUniversity of Torino Via Nizza 52 10126 Torino Italy
| | - Daniela Delli Castelli
- Department of Molecular Biotechnology and Health SciencesUniversity of Torino Via Nizza 52 10126 Torino Italy
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168
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Uddin SMN, Laokroekkiat S, Rashed MA, Mizuno S, Ono K, Ishizaki M, Kanaizuka K, Kurihara M, Nagao Y, Hamada T. Ion transportation by Prussian blue nanoparticles embedded in a giant liposome. Chem Commun (Camb) 2020; 56:1046-1049. [PMID: 31868183 DOI: 10.1039/c9cc06153c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new type of artificial giant liposome incorporating ion transport channels and using nanoparticles of metal organic frameworks was demonstrated. The micropores of Prussian blue nanoparticles served as ion transport channels between the outer and inner phases of liposomes.
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Affiliation(s)
- S M Nizam Uddin
- School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan.
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169
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Komiya M, Kato M, Tadaki D, Ma T, Yamamoto H, Tero R, Tozawa Y, Niwano M, Hirano‐Iwata A. Advances in Artificial Cell Membrane Systems as a Platform for Reconstituting Ion Channels. CHEM REC 2020; 20:730-742. [DOI: 10.1002/tcr.201900094] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Revised: 12/24/2019] [Accepted: 12/27/2019] [Indexed: 01/08/2023]
Affiliation(s)
- Maki Komiya
- Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical CommunicationTohoku University 2-1-1 Katahira, Aoba-ku, Sendai-shi Miyagi 980-8577 Japan
| | - Miki Kato
- Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical CommunicationTohoku University 2-1-1 Katahira, Aoba-ku, Sendai-shi Miyagi 980-8577 Japan
| | - Daisuke Tadaki
- Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical CommunicationTohoku University 2-1-1 Katahira, Aoba-ku, Sendai-shi Miyagi 980-8577 Japan
| | - Teng Ma
- Advanced Institute for Materials ResearchTohoku University 2-1-1 Katahira, Aoba-ku, Sendai-shi Miyagi 980-8577 Japan
| | - Hideaki Yamamoto
- Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical CommunicationTohoku University 2-1-1 Katahira, Aoba-ku, Sendai-shi Miyagi 980-8577 Japan
| | - Ryugo Tero
- Department of Applied Chemistry and Life ScienceToyohashi University of Technology 1-1 Hibarigaoka, Tempaku-cho, Toyohashi Aichi 441-8580 Japan
| | - Yuzuru Tozawa
- Graduate School of Science and EngineeringSaitama University 255 Shimo-Okubo, Sakura-ku, Saitama-shi Saitama 338-8570 Japan
| | - Michio Niwano
- Kansei Fukushi Research InstituteTohoku Fukushi University 6-149-1 Kunimi-ga-oka, Aoba-ku, Sendai-shi Miyagi 989-3201 Japan
| | - Ayumi Hirano‐Iwata
- Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical CommunicationTohoku University 2-1-1 Katahira, Aoba-ku, Sendai-shi Miyagi 980-8577 Japan
- Advanced Institute for Materials ResearchTohoku University 2-1-1 Katahira, Aoba-ku, Sendai-shi Miyagi 980-8577 Japan
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170
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Tripepi M, Ferrauto G, Bennardi PO, Aime S, Delli Castelli D. Multilamellar LipoCEST Agents Obtained from Osmotic Shrinkage of Paramagnetically Loaded Giant Unilamellar Vescicles (GUVs). Angew Chem Int Ed Engl 2020; 59:2279-2283. [PMID: 31803970 DOI: 10.1002/anie.201912327] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Indexed: 12/16/2022]
Abstract
Moving from nano- to micro-systems may not just be a matter of scale, but it might imply changes in the properties of the systems that can open new routes for the development of efficient MRI contrast agents. This is the case reported in the present paper, where giant liposomes (giant unilamellar vesicles, GUVs) loaded with LnIII complexes have been studied as chemical exchange saturation transfer (CEST) MRI contrast agents. The comparison between nanosized liposomes (small unilamellar vesicles, SUVs) and GUVs sharing the same formulation led to differences that could not be accounted for only in terms of the increase in size (from 100-150 nm to 1-2 μm). Upon osmotic shrinkage, GUVs yielded a saturation-transfer effect three order of magnitude higher than SUVs consistent with the increase in vesicles volume. Confocal microscopy showed that the shrinkage of GUVs resulted in multilamellar particles whereas SUVs are known to yield asymmetrical, discoidal shape.
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Affiliation(s)
- Martina Tripepi
- Department of Molecular Biotechnology and Health Sciences, University of Torino, Via Nizza 52, 10126, Torino, Italy
| | - Giuseppe Ferrauto
- Department of Molecular Biotechnology and Health Sciences, University of Torino, Via Nizza 52, 10126, Torino, Italy
| | - Paolo Oronzo Bennardi
- Department of Molecular Biotechnology and Health Sciences, University of Torino, Via Nizza 52, 10126, Torino, Italy
| | - Silvio Aime
- Department of Molecular Biotechnology and Health Sciences, University of Torino, Via Nizza 52, 10126, Torino, Italy
| | - Daniela Delli Castelli
- Department of Molecular Biotechnology and Health Sciences, University of Torino, Via Nizza 52, 10126, Torino, Italy
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171
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A protocell with fusion and division. Biochem Soc Trans 2019; 47:1909-1919. [PMID: 31819942 DOI: 10.1042/bst20190576] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Revised: 11/12/2019] [Accepted: 11/25/2019] [Indexed: 11/17/2022]
Abstract
A protocell is a synthetic form of cellular life that is constructed from phospholipid vesicles and used to understand the emergence of life from a nonliving chemical network. To be considered 'living', a protocell should be capable of self-proliferation, which includes successive growth and division processes. The growth of protocells can be achieved via vesicle fusion approaches. In this review, we provide a brief overview of recent research on the formation of a protocell, fusion and division processes of the protocell, and encapsulation of a defined chemical network such as the genetic material. We also provide some perspectives on the challenges and future developments of synthetic protocell research.
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172
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Oropeza-Guzman E, Ríos-Ramírez M, Ruiz-Suárez JC. Leveraging the Coffee Ring Effect for a Defect-Free Electroformation of Giant Unilamellar Vesicles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:16528-16535. [PMID: 31747518 DOI: 10.1021/acs.langmuir.9b02488] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We took advantage of the microflow hydrodynamics in the evaporation of sessile droplets to increase the height uniformity of thin lipid films for the subsequent electroformation of defect-free giant unilamellar vesicles (GUV). By serially casting progressively larger liposome suspension droplets on the same spot of an indium-tin-oxide (ITO) electrode, we managed to leverage the coffee ring effect (CRE) in the evaporation of each droplet to generate a smeared multilayer film of uniform thickness. This multidroplet technique of lipid film formation outperformed the traditional single-droplet deposition, improving the final quality of electroformed GUV samples. The proposed film formation technique constitutes a solvent-free method that results in a dramatic reduction (∼20×) in the appearance of undesirable structures like nonspherical (NSV), multilamellar (MLV), and multivesicular (MVV) vesicles.
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Affiliation(s)
- Eric Oropeza-Guzman
- Centro de Investigación y de Estudios Avanzados del IPN (CINVESTAV) Unidad Monterrey , Apodaca , Nuevo León 66600 , México
| | - Maricarmen Ríos-Ramírez
- Centro de Investigación y de Estudios Avanzados del IPN (CINVESTAV) Unidad Monterrey , Apodaca , Nuevo León 66600 , México
| | - Jesús Carlos Ruiz-Suárez
- Centro de Investigación y de Estudios Avanzados del IPN (CINVESTAV) Unidad Monterrey , Apodaca , Nuevo León 66600 , México
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173
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Ossai EC, Kuroiwa T, Horikoshi K, Otsuka Y, Terasawa J, Kanazawa A, Sato S, Ichikawa S. Lipid Vesicle Preparation Using W/O/W Multiple Emulsions Via Solvent Evaporation: The Effect of Emulsifiers on the Entrapment Yield of Hydrophilic Materials. J AM OIL CHEM SOC 2019. [DOI: 10.1002/aocs.12275] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Emmanuel Chekwube Ossai
- Faculty of Life and Environmental SciencesUniversity of Tsukuba Tennodai 1‐1‐1, Tsukuba, Ibaraki 305‐8572 Japan
| | - Takashi Kuroiwa
- Department of Chemistry and Energy Engineering, Faculty of EngineeringTokyo City University Tamazutsumi 1‐28‐1, Setagaya‐ku, Tokyo 158‐8557 Japan
| | - Kaname Horikoshi
- Department of Chemistry and Energy Engineering, Faculty of EngineeringTokyo City University Tamazutsumi 1‐28‐1, Setagaya‐ku, Tokyo 158‐8557 Japan
| | - Yuya Otsuka
- Faculty of Life and Environmental SciencesUniversity of Tsukuba Tennodai 1‐1‐1, Tsukuba, Ibaraki 305‐8572 Japan
| | - Junki Terasawa
- Faculty of Life and Environmental SciencesUniversity of Tsukuba Tennodai 1‐1‐1, Tsukuba, Ibaraki 305‐8572 Japan
| | - Akihiko Kanazawa
- Department of Chemistry and Energy Engineering, Faculty of EngineeringTokyo City University Tamazutsumi 1‐28‐1, Setagaya‐ku, Tokyo 158‐8557 Japan
| | - Seigo Sato
- Faculty of Life and Environmental SciencesUniversity of Tsukuba Tennodai 1‐1‐1, Tsukuba, Ibaraki 305‐8572 Japan
| | - Sosaku Ichikawa
- Faculty of Life and Environmental SciencesUniversity of Tsukuba Tennodai 1‐1‐1, Tsukuba, Ibaraki 305‐8572 Japan
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174
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Moga A, Yandrapalli N, Dimova R, Robinson T. Optimization of the Inverted Emulsion Method for High-Yield Production of Biomimetic Giant Unilamellar Vesicles. Chembiochem 2019; 20:2674-2682. [PMID: 31529570 PMCID: PMC6856842 DOI: 10.1002/cbic.201900529] [Citation(s) in RCA: 63] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Indexed: 01/21/2023]
Abstract
In the field of bottom-up synthetic biology, lipid vesicles provide an important role in the construction of artificial cells. Giant unilamellar vesicles (GUVs), due to their membrane's similarity to natural biomembranes, have been widely used as cellular mimics. So far, several methods exist for the production of GUVs with the possibility to encapsulate biological macromolecules. The inverted emulsion-based method is one such technique, which has great potential for rapid production of GUVs with high encapsulation efficiencies for large biomolecules. However, the lack of understanding of various parameters that affect production yields has resulted in sparse adaptation within the membrane and bottom-up synthetic biology research communities. Here, we optimize various parameters of the inverted emulsion-based method to maximize the production of GUVs. We demonstrate that the density difference between the emulsion droplets, oil phase, and the outer aqueous phase plays a crucial role in vesicle formation. We also investigated the impact that centrifugation speed/time, lipid concentration, pH, temperature, and emulsion droplet volume has on vesicle yield and size. Compared to conventional electroformation, our preparation method was not found to significantly alter the membrane mechanical properties. Finally, we optimize the parameters to minimize the time from workbench to microscope and in this way open up the possibility of time-sensitive experiments. In conclusion, our findings will promote the usage of the inverted emulsion method for basic membrane biophysics studies as well as the development of GUVs for use as future artificial cells.
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Affiliation(s)
- Akanksha Moga
- Theory & Bio-Systems DepartmentMax Planck Institute of Colloids and InterfacesPotsdam-Golm Science Park14424PotsdamGermany
| | - Naresh Yandrapalli
- Theory & Bio-Systems DepartmentMax Planck Institute of Colloids and InterfacesPotsdam-Golm Science Park14424PotsdamGermany
| | - Rumiana Dimova
- Theory & Bio-Systems DepartmentMax Planck Institute of Colloids and InterfacesPotsdam-Golm Science Park14424PotsdamGermany
| | - Tom Robinson
- Theory & Bio-Systems DepartmentMax Planck Institute of Colloids and InterfacesPotsdam-Golm Science Park14424PotsdamGermany
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175
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Krafft D, López Castellanos S, Lira RB, Dimova R, Ivanov I, Sundmacher K. Compartments for Synthetic Cells: Osmotically Assisted Separation of Oil from Double Emulsions in a Microfluidic Chip. Chembiochem 2019; 20:2604-2608. [PMID: 31090995 PMCID: PMC6852271 DOI: 10.1002/cbic.201900152] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Revised: 05/10/2019] [Indexed: 01/20/2023]
Abstract
Liposomes are used in synthetic biology as cell-like compartments and their microfluidic production through double emulsions allows for efficient encapsulation of various components. However, residual oil in the membrane remains a critical bottleneck for creating pristine phospholipid bilayers. It has been discovered that osmotically driven shrinking leads to detachment of the oil drop. Separation inside a microfluidic chip has been realized to automate the procedure, which allows for controlled continuous production of monodisperse liposomes.
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Affiliation(s)
- Dorothee Krafft
- Process Systems EngineeringMax Planck Institute for Dynamics of Complex Technical SystemsSandtorstrasse 139106MagdeburgGermany
| | - Sebastián López Castellanos
- Process Systems EngineeringMax Planck Institute for Dynamics of Complex Technical SystemsSandtorstrasse 139106MagdeburgGermany
| | - Rafael B. Lira
- Theory and Bio-SystemsMax Planck Institute of Colloids and InterfacesScience Park Golm14424PotsdamGermany
| | - Rumiana Dimova
- Theory and Bio-SystemsMax Planck Institute of Colloids and InterfacesScience Park Golm14424PotsdamGermany
| | - Ivan Ivanov
- Process Systems EngineeringMax Planck Institute for Dynamics of Complex Technical SystemsSandtorstrasse 139106MagdeburgGermany
| | - Kai Sundmacher
- Process Systems EngineeringMax Planck Institute for Dynamics of Complex Technical SystemsSandtorstrasse 139106MagdeburgGermany
- Otto-von-Guericke University MagdeburgUniversitätsplatz 239106MagdeburgGermany
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176
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Katsuta S, Okano T, Koiwai K, Suzuki H. Ejection of Large Particulate Materials from Giant Unilamellar Vesicles Induced by Electropulsation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:13196-13204. [PMID: 31498647 DOI: 10.1021/acs.langmuir.9b01617] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Electroporation or electropermealization is a technique to open pores in the lipid bilayer membrane of cells and vesicles transiently to increase its permeability to otherwise impermeable molecules. However, the upper size limit of the materials permeable through this operation has not been studied in the past. Here, we investigate the size of the material that can be released (ejected) from giant unilamellar vesicles (GUVs) upon electrical pulsation. We confirm that the volume of GUV shrinks in a stepwise manner upon periodical pulsation, in accordance with previous studies. When the same operation is applied to GUVs that encapsulate microbeads, we find that beads as large as 20 μm can be ejected across the membrane without rupturing the whole GUV structure. We also demonstrate that functional bioactive particulate materials, such as gel balls, vesicles, and cells can be encapsulated in and ejected from GUVs. We foresee that this phenomenon can be applied to precisely regulate the time and location of release of these particulate materials in the microenvironment.
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Affiliation(s)
- Shota Katsuta
- Dept. Precision Mechanics, Faculty of Science and Engineering , Chuo University , 1-13-27 Kasuga , Bunkyo-ku , Tokyo 112-8551 , Japan
| | - Taiji Okano
- Dept. Precision Mechanics, Faculty of Science and Engineering , Chuo University , 1-13-27 Kasuga , Bunkyo-ku , Tokyo 112-8551 , Japan
| | - Keiichiro Koiwai
- Dept. Precision Mechanics, Faculty of Science and Engineering , Chuo University , 1-13-27 Kasuga , Bunkyo-ku , Tokyo 112-8551 , Japan
- Japan Society for the Promotion of Science (JSPS) , 5-3-1 Kojimachi , Chiyoda-ku , Tokyo 102-0083 , Japan
| | - Hiroaki Suzuki
- Dept. Precision Mechanics, Faculty of Science and Engineering , Chuo University , 1-13-27 Kasuga , Bunkyo-ku , Tokyo 112-8551 , Japan
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177
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Robinson T, Dittrich PS. Observations of Membrane Domain Reorganization in Mechanically Compressed Artificial Cells. Chembiochem 2019; 20:2666-2673. [DOI: 10.1002/cbic.201900167] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Indexed: 01/01/2023]
Affiliation(s)
- Tom Robinson
- ETH ZurichDepartment of Biosystems Science and Engineering Mattenstrasse 26 4058 Basel Switzerland
- Present address: Department of Theory, Bio-SystemsMax Planck Institute of Colloids and Interfaces Science Park Golm 14424 Potsdam Germany
| | - Petra S. Dittrich
- ETH ZurichDepartment of Biosystems Science and Engineering Mattenstrasse 26 4058 Basel Switzerland
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178
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Chimisso V, Maffeis V, Hürlimann D, Palivan CG, Meier W. Self-Assembled Polymeric Membranes and Nanoassemblies on Surfaces: Preparation, Characterization, and Current Applications. Macromol Biosci 2019; 20:e1900257. [PMID: 31549783 DOI: 10.1002/mabi.201900257] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Revised: 08/30/2019] [Indexed: 01/11/2023]
Abstract
Biomembranes play a crucial role in a multitude of biological processes, where high selectivity and efficiency are key points in the reaction course. The outstanding performance of biological membranes is based on the coupling between the membrane and biomolecules, such as membrane proteins. Polymer-based membranes and assemblies represent a great alternative to lipid ones, as their presence not only dramatically increases the mechanical stability of such systems, but also opens the scope to a broad range of chemical functionalities, which can be fine-tuned to selectively combine with a specific biomolecule. Tethering the membranes or nanoassemblies on a solid support opens the way to a class of functional surfaces finding application as sensors, biocomputing systems, molecular recognition, and filtration membranes. Herein, the design, physical assembly, and biomolecule attachment/insertion on/within solid-supported polymeric membranes and nanoassemblies are presented in detail with relevant examples. Furthermore, the models and applications for these materials are highlighted with the recent advances in each field.
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Affiliation(s)
- Vittoria Chimisso
- Department of Chemistry, University of Basel, Mattenstrasse 24a, 4056, Basel, Switzerland
| | - Viviana Maffeis
- Department of Chemistry, University of Basel, Mattenstrasse 24a, 4056, Basel, Switzerland
| | - Dimitri Hürlimann
- Department of Chemistry, University of Basel, Mattenstrasse 24a, 4056, Basel, Switzerland
| | - Cornelia G Palivan
- Department of Chemistry, University of Basel, Mattenstrasse 24a, 4056, Basel, Switzerland
| | - Wolfgang Meier
- Department of Chemistry, University of Basel, Mattenstrasse 24a, 4056, Basel, Switzerland
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179
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Wang X, Tian L, Du H, Li M, Mu W, Drinkwater BW, Han X, Mann S. Chemical communication in spatially organized protocell colonies and protocell/living cell micro-arrays. Chem Sci 2019; 10:9446-9453. [PMID: 32055320 PMCID: PMC6991169 DOI: 10.1039/c9sc04522h] [Citation(s) in RCA: 71] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Accepted: 09/11/2019] [Indexed: 12/12/2022] Open
Abstract
Arrays of giant unilamellar vesicles (GUVs) with controllable geometries and occupancies are prepared by acoustic trapping and used to implement chemical signaling in protocell colonies and protocell/living cell consortia.
Micro-arrays of discrete or hemifused giant unilamellar lipid vesicles (GUVs) with controllable spatial geometries, lattice dimensions, trapped occupancies and compositions are prepared by acoustic standing wave patterning, and employed as platforms to implement chemical signaling in GUV colonies and protocell/living cell consortia. The methodology offers an alternative approach to GUV micro-array fabrication and provides new opportunities in protocell research and bottom-up synthetic biology.
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Affiliation(s)
- Xuejing Wang
- State Key Laboratory of Urban Water Resource and Environment , School of Chemistry and Chemical Engineering , Harbin Institute of Technology , Harbin , 150001 , China . .,Centre for Protolife Research and Centre for Organized Matter Chemistry , School of Chemistry University of Bristol , Bristol , BS8 1TS UK .
| | - Liangfei Tian
- Centre for Protolife Research and Centre for Organized Matter Chemistry , School of Chemistry University of Bristol , Bristol , BS8 1TS UK .
| | - Hang Du
- State Key Laboratory of Urban Water Resource and Environment , School of Chemistry and Chemical Engineering , Harbin Institute of Technology , Harbin , 150001 , China .
| | - Mei Li
- Centre for Protolife Research and Centre for Organized Matter Chemistry , School of Chemistry University of Bristol , Bristol , BS8 1TS UK .
| | - Wei Mu
- State Key Laboratory of Urban Water Resource and Environment , School of Chemistry and Chemical Engineering , Harbin Institute of Technology , Harbin , 150001 , China .
| | | | - Xiaojun Han
- State Key Laboratory of Urban Water Resource and Environment , School of Chemistry and Chemical Engineering , Harbin Institute of Technology , Harbin , 150001 , China .
| | - Stephen Mann
- Centre for Protolife Research and Centre for Organized Matter Chemistry , School of Chemistry University of Bristol , Bristol , BS8 1TS UK .
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180
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Steinkühler J, Sezgin E, Urbančič I, Eggeling C, Dimova R. Mechanical properties of plasma membrane vesicles correlate with lipid order, viscosity and cell density. Commun Biol 2019; 2:337. [PMID: 31531398 PMCID: PMC6744421 DOI: 10.1038/s42003-019-0583-3] [Citation(s) in RCA: 88] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2018] [Accepted: 08/15/2019] [Indexed: 11/08/2022] Open
Abstract
Regulation of plasma membrane curvature and composition governs essential cellular processes. The material property of bending rigidity describes the energetic cost of membrane deformations and depends on the plasma membrane molecular composition. Because of compositional fluctuations and active processes, it is challenging to measure it in intact cells. Here, we study the plasma membrane using giant plasma membrane vesicles (GPMVs), which largely preserve the plasma membrane lipidome and proteome. We show that the bending rigidity of plasma membranes under varied conditions is correlated to readout from environment-sensitive dyes, which are indicative of membrane order and microviscosity. This correlation holds across different cell lines, upon cholesterol depletion or enrichment of the plasma membrane, and variations in cell density. Thus, polarity- and viscosity-sensitive probes represent a promising indicator of membrane mechanical properties. Additionally, our results allow for identifying synthetic membranes with a few well defined lipids as optimal plasma membrane mimetics.
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Affiliation(s)
- Jan Steinkühler
- Theory and Bio-Systems, Max Planck Institute of Colloids and Interfaces, Science Park Golm, 14424 Potsdam, Germany
| | - Erdinc Sezgin
- MRC Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, Headley Way, Oxford, OX3 9DS UK
| | - Iztok Urbančič
- MRC Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, Headley Way, Oxford, OX3 9DS UK
- Condensed Matter Physics Department, “Jožef Stefan” Institute, Ljubljana, Slovenia
| | - Christian Eggeling
- MRC Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, Headley Way, Oxford, OX3 9DS UK
- Institute of Applied Optics Friedrich‐Schiller‐University Jena, Max-Wien Platz 4, 07743 Jena, Germany
- Leibniz Institute of Photonic Technology e.V., Albert-Einstein-Straße 9, 07745 Jena, Germany
| | - Rumiana Dimova
- Theory and Bio-Systems, Max Planck Institute of Colloids and Interfaces, Science Park Golm, 14424 Potsdam, Germany
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181
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Berlanga I. Synthesis of Non-Uniform Functionalized Amphiphilic Block Copolymers and Giant Vesicles in the Presence of the Belousov-Zhabotinsky Reaction. Biomolecules 2019; 9:E352. [PMID: 31398958 PMCID: PMC6723531 DOI: 10.3390/biom9080352] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2019] [Revised: 08/05/2019] [Accepted: 08/05/2019] [Indexed: 12/14/2022] Open
Abstract
Giant vesicles with several-micrometer diameters were prepared by the self-assembly of an amphiphilic block copolymer in the presence of the Belousov-Zhabotinsky (BZ) reaction. The vesicle is composed of a non-uniform triblock copolymer synthesized by multi-step reactions in the presence of air at room temperature. The triblock copolymer contains poly(glycerol monomethacrylate) (PGMA) as the hydrophilic block copolymerized with tris(2,2'-bipyridyl)ruthenium(II) (Ru(bpy)3), which catalyzes the BZ reaction, and 2-hydroxypropyl methacrylate (HPMA) as the hydrophobic block. In this new approach, the radicals generated in the BZ reaction can activate a reversible addition-fragmentation chain transfer (RAFT) polymerization to self-assemble the polymer into vesicles with diameters of approximately 3 µm. X-ray photoelectron spectroscopy (XPS) measurements demonstrated that the PGMA-b-Ru(bpy)3-b-PHPMA triblock copolymer is brominated and increases the osmotic pressure inside the vesicle, leading to micrometer-sized features. The effect of solvent on the morphological transitions are also discussed briefly. This BZ strategy, offers a new perspective to prepare giant vesicles as a platform for promising applications in the areas of microencapsulation and catalyst support, due to their significant sizes and large microcavities.
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Affiliation(s)
- Isadora Berlanga
- Department of Earth and Planetary Sciences and Origins of Life Initiative, Harvard University, 100 Edwin H. Land Bvld., Cambridge, MA 02138, USA.
- Department of Chemical Engineering, Biotechnology and Materials. FCFM, Universidad de Chile, Beauchef 851, Santiago 8370456, Chile.
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182
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Sato Y, Komiya K, Kawamata I, Murata S, Nomura SIM. Isothermal amplification of specific DNA molecules inside giant unilamellar vesicles. Chem Commun (Camb) 2019; 55:9084-9087. [PMID: 31287464 DOI: 10.1039/c9cc03277k] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
An isothermal amplification circuit for specific DNA molecules was implemented in giant unilamellar vesicles. Using this circuit, over 5000-fold amplification of output DNAs was achieved, and the amplification behaviour depended on the concentration of input signal DNAs in a cell-sized compartment. Moreover, initiation of the amplification by photo-stimulation was demonstrated.
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Affiliation(s)
- Yusuke Sato
- Department of Robotics, Tohoku University, Miyagi 980-8579, Japan.
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183
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Ishii I, Ominato Y, Karasawa A, Takahashi T, Matsuo M, Suzuki K, Sugawara T. Morphological Changes of Kinetically Trapped Tubular Vesicles Driven by the Production of Synthetic Phospholipids in a Vesicular Membrane. CHEM LETT 2019. [DOI: 10.1246/cl.190260] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Ibuki Ishii
- Department of Chemistry, Faculty of Science, Kanagawa University, Tsuchiya, Hiratsuka, Kanagawa 259-1293, Japan
| | - Yuka Ominato
- Department of Chemistry, Faculty of Science, Kanagawa University, Tsuchiya, Hiratsuka, Kanagawa 259-1293, Japan
| | - Akane Karasawa
- Department of Chemistry, Faculty of Science, Kanagawa University, Tsuchiya, Hiratsuka, Kanagawa 259-1293, Japan
| | - Tatsuya Takahashi
- Department of Chemistry, Faculty of Science, Kanagawa University, Tsuchiya, Hiratsuka, Kanagawa 259-1293, Japan
| | - Muneyuki Matsuo
- Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, Komaba, Meguro, Tokyo 153-8902, Japan
- Department of Life and Coordination-Complex Molecular Science, Biomolecular Functions, Institute for Molecular Science, Myodaiji, Okazaki, Aichi 444-8585, Japan
| | - Kentaro Suzuki
- Department of Chemistry, Faculty of Science, Kanagawa University, Tsuchiya, Hiratsuka, Kanagawa 259-1293, Japan
| | - Tadashi Sugawara
- Department of Chemistry, Faculty of Science, Kanagawa University, Tsuchiya, Hiratsuka, Kanagawa 259-1293, Japan
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184
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Influenza A matrix protein M1 induces lipid membrane deformation via protein multimerization. Biosci Rep 2019; 39:BSR20191024. [PMID: 31324731 PMCID: PMC6682550 DOI: 10.1042/bsr20191024] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Revised: 07/09/2019] [Accepted: 07/18/2019] [Indexed: 12/16/2022] Open
Abstract
The matrix protein M1 of the Influenza A virus (IAV) is supposed to mediate viral assembly and budding at the plasma membrane (PM) of infected cells. In order for a new viral particle to form, the PM lipid bilayer has to bend into a vesicle toward the extracellular side. Studies in cellular models have proposed that different viral proteins might be responsible for inducing membrane curvature in this context (including M1), but a clear consensus has not been reached. In the present study, we use a combination of fluorescence microscopy, cryogenic transmission electron microscopy (cryo-TEM), cryo-electron tomography (cryo-ET) and scanning fluorescence correlation spectroscopy (sFCS) to investigate M1-induced membrane deformation in biophysical models of the PM. Our results indicate that M1 is indeed able to cause membrane curvature in lipid bilayers containing negatively charged lipids, in the absence of other viral components. Furthermore, we prove that protein binding is not sufficient to induce membrane restructuring. Rather, it appears that stable M1-M1 interactions and multimer formation are required in order to alter the bilayer three-dimensional structure, through the formation of a protein scaffold. Finally, our results suggest that, in a physiological context, M1-induced membrane deformation might be modulated by the initial bilayer curvature and the lateral organization of membrane components (i.e. the presence of lipid domains).
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185
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Matsuo M, Ohyama S, Sakurai K, Toyota T, Suzuki K, Sugawara T. A sustainable self-reproducing liposome consisting of a synthetic phospholipid. Chem Phys Lipids 2019; 222:1-7. [DOI: 10.1016/j.chemphyslip.2019.04.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Revised: 03/26/2019] [Accepted: 04/15/2019] [Indexed: 01/23/2023]
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186
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Faizi HA, Frey SL, Steinkühler J, Dimova R, Vlahovska PM. Bending rigidity of charged lipid bilayer membranes. SOFT MATTER 2019; 15:6006-6013. [PMID: 31298256 DOI: 10.1039/c9sm00772e] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We experimentally investigate the effect of lipid charge on the stiffness of bilayer membranes. The bending rigidity of membranes with composition 0-100 mol% of charged lipids, in the absence and presence of salt at different concentrations, is measured with the flicker spectroscopy method, using the shape fluctuations of giant unilamellar vesicles. The analysis considers both the mean squared amplitudes and the time autocorrelations of the shape modes. Our results show that membrane charge increases the bending rigidity relative to the charge-free membrane. The effect is diminished by the addition of monovalent salt to the suspending solutions. The trend shown by the membrane bending rigidity correlates with zeta potential measurements, confirming charge screening at different salt concentrations. The experimental results in the presence of salt are in good agreement with existing theories of membrane stiffening by surface charge.
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Affiliation(s)
- Hammad A Faizi
- Department of Mechanical Engineering, McCormick School of Engineering and Applied Science, Northwestern University, Evanston, Illinois 60208, USA
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187
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Girish V, Pazzi J, Li A, Subramaniam AB. Fabrics of Diverse Chemistries Promote the Formation of Giant Vesicles from Phospholipids and Amphiphilic Block Copolymers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:9264-9273. [PMID: 31276413 DOI: 10.1021/acs.langmuir.9b01621] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Giant vesicles composed of phospholipids and amphiphilic block copolymers are useful for biomimetic drug delivery, for biophysical experiments, and for creating synthetic cells. Here, we report that large numbers of giant unilamellar vesicles (GUVs) can be formed on a broad range of fabrics composed of entangled cylindrical fibers. We show that fabrics woven from fibers of silk, wool, rayon, nylon, polyester, and fiberglass promote the formation of GUVs and giant polymer vesicles (polymersomes) in aqueous solutions. The result extends significantly previous reports on the formation of GUVs on cellulose paper and cotton fabric. Giant vesicles formed on all the fabrics from lipids with various headgroup charges, chains lengths, and chain saturations. Giant vesicles could be formed from multicomponent lipid mixtures, from extracts of plasma membranes, and from amphiphilic diblock and triblock copolymers, in both low ionic strength and high ionic strength solutions. Intriguingly, statistical characterization using a model lipid, 1,2-dioleoyl-sn-glycero-3-phosphocholine, revealed that the majority of the fabrics yielded similar average counts of vesicles. Additionally, the vesicle populations obtained from the different fabrics had similar distributions of sizes. Fabrics are ubiquitous in society in consumer, technical, and biomedical applications. The discovery herein that biomimetic GUVs grow on fabrics opens promising new avenues in vesicle-based smart materials design.
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Affiliation(s)
- Vaishnavi Girish
- Department of Bioengineering , University of California, Merced , Merced , California 95343 , United States
| | - Joseph Pazzi
- Department of Bioengineering , University of California, Merced , Merced , California 95343 , United States
| | - Alexander Li
- Department of Bioengineering , University of California, Merced , Merced , California 95343 , United States
| | - Anand Bala Subramaniam
- Department of Bioengineering , University of California, Merced , Merced , California 95343 , United States
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188
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Zhang S, Gibson LJ, Stilgoe AB, Nieminen TA, Rubinsztein-Dunlop H. Measuring local properties inside a cell-mimicking structure using rotating optical tweezers. JOURNAL OF BIOPHOTONICS 2019; 12:e201900022. [PMID: 30779305 DOI: 10.1002/jbio.201900022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2019] [Revised: 02/13/2019] [Accepted: 02/14/2019] [Indexed: 05/06/2023]
Abstract
Exploring the rheological properties of intracellular materials is essential for understanding cellular and subcellular processes. Optical traps have been widely used for physical manipulation of micro and nano objects within fluids enabling studies of biological systems. However, experiments remain challenging as it is unclear how the probe particle's mobility is influenced by the nearby membranes and organelles. We use liposomes (unilamellar lipid vesicles) as a simple biomimetic model of living cells, together with a trapped particle rotated by optical tweezers to study mechanical and rheological properties inside a liposome both theoretically and experimentally. Here, we demonstrate that this system has the capacity to predict the hydrodynamic interaction between three-dimensional spatial membranes and internal probe particles within submicron distances, and it has the potential to aid in the design of high resolution optical micro/nanorheology techniques to be used inside living cells.
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Affiliation(s)
- Shu Zhang
- Department of Physics, School of Mathematics and Physics, The University of Queensland, Brisbane, Queensland, Australia
| | - Lachlan J Gibson
- Department of Physics, School of Mathematics and Physics, The University of Queensland, Brisbane, Queensland, Australia
| | - Alexander B Stilgoe
- Department of Physics, School of Mathematics and Physics, The University of Queensland, Brisbane, Queensland, Australia
| | - Timo A Nieminen
- Department of Physics, School of Mathematics and Physics, The University of Queensland, Brisbane, Queensland, Australia
| | - Halina Rubinsztein-Dunlop
- Department of Physics, School of Mathematics and Physics, The University of Queensland, Brisbane, Queensland, Australia
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189
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Rodrigues L, Schneider F, Zhang X, Larsson E, Moodie LWK, Dietz H, Papadakis CM, Winter G, Lundmark R, Hubert M. Cellular uptake of self-assembled phytantriol-based hexosomes is independent of major endocytic machineries. J Colloid Interface Sci 2019; 553:820-833. [PMID: 31284226 DOI: 10.1016/j.jcis.2019.06.045] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Revised: 06/12/2019] [Accepted: 06/14/2019] [Indexed: 01/08/2023]
Abstract
Despite increasing interests in non-lamellar liquid crystalline dispersions, such as hexosomes, for drug delivery, little is known about their interactions with cells and mechanism of cell entry. Here we examine the cellular uptake of hexosomes based on phytantriol and mannide monooleate by HeLa cells using live cell microscopy in comparison to conventional liposomes. To investigate the importance of specific endocytosis pathways upon particle internalization, we silenced regulatory proteins of major endocytosis pathways using short interfering RNA. While endocytosis plays a significant role in liposome internalization, hexosomes are not taken up via endocytosis but through a mechanism that is dependent on cell membrane tension. Biophysical studies using biomembrane models highlighted that hexosomes have a high affinity for membranes and an ability to disrupt lipid layers. Our data suggest that direct biomechanical interactions of hexosomes with membrane lipids play a crucial role and that the unique morphology of hexosomes is vital for their membrane activity. Based on these results, we propose a mechanism, where hexosomes destabilize the bilayer, allowing them to "phase through" the membrane. Understanding parameters that influence the uptake of hexosomes is critical to establish them as carrier systems that can potentially deliver therapeutics efficiently to intracellular sites of action.
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Affiliation(s)
- Letícia Rodrigues
- Department of Pharmacy, Pharmaceutical Technology and Biopharmacy, Ludwig-Maximilians-Universität München, Butenandtstraße 5-13, DE-81377 Munich, Germany
| | - Fabian Schneider
- Physics Department and Institute for Advanced Study, Walter Schottky Institute, Technische Universität München, Am Coulombwall 4a, DE-85748, Garching, Germany
| | - Xiaohan Zhang
- Physics Department, Soft Matter Physics Group, Technische Universität München, James-Franck-Straße 1, DE-85748 Garching, Germany
| | - Elin Larsson
- Department of Integrative Medical Biology, Umeå University, Johan Bures väg 12, SE-901 87 Umeå, Sweden
| | - Lindon W K Moodie
- Department of Chemistry, Umeå University, Linnaeus väg 1, SE-907 36 Umeå, Sweden
| | - Hendrik Dietz
- Physics Department and Institute for Advanced Study, Walter Schottky Institute, Technische Universität München, Am Coulombwall 4a, DE-85748, Garching, Germany
| | - Christine M Papadakis
- Physics Department, Soft Matter Physics Group, Technische Universität München, James-Franck-Straße 1, DE-85748 Garching, Germany
| | - Gerhard Winter
- Department of Pharmacy, Pharmaceutical Technology and Biopharmacy, Ludwig-Maximilians-Universität München, Butenandtstraße 5-13, DE-81377 Munich, Germany
| | - Richard Lundmark
- Department of Integrative Medical Biology, Umeå University, Johan Bures väg 12, SE-901 87 Umeå, Sweden
| | - Madlen Hubert
- Department of Integrative Medical Biology, Umeå University, Johan Bures väg 12, SE-901 87 Umeå, Sweden.
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190
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Pazzi J, Xu M, Subramaniam AB. Size Distributions and Yields of Giant Vesicles Assembled on Cellulose Papers and Cotton Fabric. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:7798-7804. [PMID: 30444125 DOI: 10.1021/acs.langmuir.8b03076] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Lamellar phospholipid stacks on cellulose paper vesiculate to form cell-like giant unilamellar vesicles (GUVs) in aqueous solutions. The sizes and yields of the GUVs that result and their relationship to the properties of the cellulose fibers are unknown. Here, we report the characteristics of GUVs produced on four different cellulose substrates, three disordered porous media consisting of randomly entangled cellulose fibers (high-purity cellulose filter papers of different effective porosities), and an ordered network of weaved cellulose fibers (cotton fabric). Large numbers of GUVs formed on all four substrates. This result demonstrates for the first time that GUVs form on cotton fabric. Despite differences in the effective porosities and the configuration of the cellulose fibers, all four substrates yielded populations of GUVs with similar distribution of diameters. The distribution of diameters of the GUVs had a single well-defined peak and a right tail. Ninety-eight percent of the GUVs had diameters less than the average diameter of the cellulose fibers (∼20 micrometers). Cotton fabric produced the highest yield of GUVs with the lowest sample-to-sample variation. Moreover, cotton fabric is reusable. Fabric used sequentially produced similar crops of GUVs at each cycle. At the end of the sequence, there was no apparent change in the cellulose fibers. Cellulose fibers thus promote the vesiculation of lamellar phospholipid stacks in aqueous solutions.
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Affiliation(s)
- Joseph Pazzi
- Department of Bioengineering , University of California, Merced , Merced , California 95343 , United States
| | - Melissa Xu
- Department of Bioengineering , University of California, Merced , Merced , California 95343 , United States
| | - Anand Bala Subramaniam
- Department of Bioengineering , University of California, Merced , Merced , California 95343 , United States
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191
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Lopez A, Fiore M. Investigating Prebiotic Protocells for A Comprehensive Understanding of the Origins of Life: A Prebiotic Systems Chemistry Perspective. Life (Basel) 2019; 9:E49. [PMID: 31181679 PMCID: PMC6616946 DOI: 10.3390/life9020049] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Revised: 05/21/2019] [Accepted: 06/06/2019] [Indexed: 01/06/2023] Open
Abstract
Protocells are supramolecular systems commonly used for numerous applications, such as the formation of self-evolvable systems, in systems chemistry and synthetic biology. Certain types of protocells imitate plausible prebiotic compartments, such as giant vesicles, that are formed with the hydration of thin films of amphiphiles. These constructs can be studied to address the emergence of life from a non-living chemical network. They are useful tools since they offer the possibility to understand the mechanisms underlying any living cellular system: Its formation, its metabolism, its replication and its evolution. Protocells allow the investigation of the synergies occurring in a web of chemical compounds. This cooperation can explain the transition between chemical (inanimate) and biological systems (living) due to the discoveries of emerging properties. The aim of this review is to provide an overview of relevant concept in prebiotic protocell research.
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Affiliation(s)
- Augustin Lopez
- Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, Université de Lyon, Claude Bernard Lyon 1, 1 Rue Victor Grignard, Bâtiment Lederer, 69622 Villeurbanne CEDEX, France.
- Master de Biologie, École Normale Supérieure de Lyon, Université Claude Bernard Lyon I, Université de Lyon, 69342 Lyon CEDEX 07, France.
| | - Michele Fiore
- Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, Université de Lyon, Claude Bernard Lyon 1, 1 Rue Victor Grignard, Bâtiment Lederer, 69622 Villeurbanne CEDEX, France.
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192
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Silva GT, Tian L, Franklin A, Wang X, Han X, Mann S, Drinkwater BW. Acoustic deformation for the extraction of mechanical properties of lipid vesicle populations. Phys Rev E 2019; 99:063002. [PMID: 31330730 DOI: 10.1103/physreve.99.063002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Indexed: 04/30/2023]
Abstract
We use an ultrasonic standing wave to simultaneously trap and deform thousands of soft lipid vesicles immersed in a liquid solution. In our device, acoustic radiation stresses comparable in magnitude to those generated in optical stretching devices are achieved over a spatial extent of more than ten acoustic wavelengths. We solve the acoustic scattering problem in the long-wavelength limit to obtain the radiation stress. The result is then combined with thin-shell elasticity theory to form expressions that relate the deformed geometry to the applied acoustic field intensity. Using observation of the deformed geometry and this model, we rapidly extract mechanical properties, such as the membrane Young's modulus, from populations of lipid vesicles.
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Affiliation(s)
- Glauber T Silva
- Physical Acoustics Group, Instituto de Física, Universidade Federal de Alagoas, Maceió, AL 57072-970, Brazil
| | - Liangfei Tian
- Centre for Protolife Research and Centre for Organized Matter Chemistry, School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom
| | - Amanda Franklin
- Department of Mechanical Engineering, University of Bristol, Bristol BS8 1TR, United Kingdom
| | - Xuejing Wang
- State Key Laboratory of Urban Water Resource and Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150001, China
| | - Xiaojun Han
- State Key Laboratory of Urban Water Resource and Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150001, China
| | - Stephen Mann
- Centre for Protolife Research and Centre for Organized Matter Chemistry, School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom
| | - Bruce W Drinkwater
- Department of Mechanical Engineering, University of Bristol, Bristol BS8 1TR, United Kingdom
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193
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Schultze J, Vagias A, Ye L, Prantl E, Breising V, Best A, Koynov K, Marques CM, Butt HJ. Preparation of Monodisperse Giant Unilamellar Anchored Vesicles Using Micropatterned Hydrogel Substrates. ACS OMEGA 2019; 4:9393-9399. [PMID: 31460029 PMCID: PMC6648857 DOI: 10.1021/acsomega.9b00912] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Accepted: 05/16/2019] [Indexed: 06/10/2023]
Abstract
Giant unilamellar vesicles (GUVs) are model membrane systems consisting of a single lipid bilayer separating an inner lumen from the outer solution, with dimensions comparable to that of eukaryotic cells. The importance of these biomimetic systems has recently grown with the development of easy and safe methods to assemble GUVs from complex biorelevant compositions. However, size and position control is still a key challenge for GUV formation and manipulation. Here, a gel-assisted formation method is introduced, able to produce arrays of giant unilamellar anchored vesicles (GUAVs) with a predetermined narrow size distribution. The approach based on micropatterned gel substrates of cross-linked poly(N-isopropylacrylamide) allows performing parallel measurements on thousands of immobile unilamellar vesicles. Such power and flexibility will respond to the growing need for developing platforms of biomimetic constructs from cell-sized single bilayers.
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Affiliation(s)
- Jennifer Schultze
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Apostolos Vagias
- Zernike
Institute for Advanced Materials, Macromolecular Chemistry and New
Polymeric Materials, University of Groningen, Nijenborgh 4, NL-9747 AG Groningen, Netherlands
| | - Lijun Ye
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Ephraim Prantl
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Valentina Breising
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Andreas Best
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Kaloian Koynov
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Carlos M. Marques
- Institut
Charles Sadron, Université de Strasbourg,
CNRS, 23 rue du Loess, 67034 Strasbourg, France
| | - Hans-Jürgen Butt
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
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194
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Kretschmer S, Ganzinger KA, Franquelim HG, Schwille P. Synthetic cell division via membrane-transforming molecular assemblies. BMC Biol 2019; 17:43. [PMID: 31126285 PMCID: PMC6533746 DOI: 10.1186/s12915-019-0665-1] [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] [Indexed: 02/06/2023] Open
Abstract
Reproduction, i.e. the ability to produce new individuals from a parent organism, is a hallmark of living matter. Even the simplest forms of reproduction require cell division: attempts to create a designer cell therefore should include a synthetic cell division machinery. In this review, we will illustrate how nature solves this task, describing membrane remodelling processes in general and focusing on bacterial cell division in particular. We discuss recent progress made in their in vitro reconstitution, identify open challenges, and suggest how purely synthetic building blocks could provide an additional and attractive route to creating artificial cell division machineries.
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195
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Göpfrich K, Haller B, Staufer O, Dreher Y, Mersdorf U, Platzman I, Spatz JP. One-Pot Assembly of Complex Giant Unilamellar Vesicle-Based Synthetic Cells. ACS Synth Biol 2019; 8:937-947. [PMID: 31042361 PMCID: PMC6528161 DOI: 10.1021/acssynbio.9b00034] [Citation(s) in RCA: 88] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
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Here, we introduce
a one-pot method for the bottom-up assembly
of complex single- and multicompartment synthetic cells. Cellular
components are enclosed within giant unilamellar vesicles (GUVs),
produced at the milliliter scale directly from small unilamellar vesicles
(SUVs) or proteoliposomes with only basic laboratory equipment within
minutes. Toward this end, we layer an aqueous solution, containing
SUVs and all biocomponents, on top of an oil–surfactant mix.
Manual shaking induces the spontaneous formation of surfactant-stabilized
water-in-oil droplets with a spherical supported lipid bilayer at
their periphery. Finally, to release GUV-based synthetic cells from
the oil and the surfactant shell into the physiological environment,
we add an aqueous buffer and a droplet-destabilizing agent. We prove
that the obtained GUVs are unilamellar by reconstituting the pore-forming
membrane protein α-hemolysin and assess the membrane quality
with cryotransmission electron microscopy (cryoTEM), fluorescence
recovery after photobleaching (FRAP), and zeta-potential measurements
as well as confocal fluorescence imaging. We further demonstrate that
our GUV formation method overcomes key challenges of standard techniques,
offering high volumes, a flexible choice of lipid compositions and
buffer conditions, straightforward coreconstitution of proteins, and
a high encapsulation efficiency of biomolecules and even large cargo
including cells. We thereby provide a simple, robust, and broadly
applicable strategy to mass-produce complex multicomponent GUVs for
high-throughput testing in synthetic biology and biomedicine, which
can directly be implemented in laboratories around the world.
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Affiliation(s)
- Kerstin Göpfrich
- Max Planck Institute for Medical Research, Department of Cellular Biophysics, Jahnstraße 29, D 69120, Heidelberg, Germany
- Department of Biophysical Chemistry, University of Heidelberg, Im Neuenheimer Feld 253, D 69120 Heidelberg, Germany
| | - Barbara Haller
- Max Planck Institute for Medical Research, Department of Cellular Biophysics, Jahnstraße 29, D 69120, Heidelberg, Germany
- Department of Biophysical Chemistry, University of Heidelberg, Im Neuenheimer Feld 253, D 69120 Heidelberg, Germany
| | - Oskar Staufer
- Max Planck Institute for Medical Research, Department of Cellular Biophysics, Jahnstraße 29, D 69120, Heidelberg, Germany
- Department of Biophysical Chemistry, University of Heidelberg, Im Neuenheimer Feld 253, D 69120 Heidelberg, Germany
| | - Yannik Dreher
- Max Planck Institute for Medical Research, Department of Cellular Biophysics, Jahnstraße 29, D 69120, Heidelberg, Germany
- Department of Biophysical Chemistry, University of Heidelberg, Im Neuenheimer Feld 253, D 69120 Heidelberg, Germany
| | - Ulrike Mersdorf
- Max Planck Institute for Medical Research, Department of Biomolecular Mechanisms, Jahnstraße 29, D 69120, Heidelberg, Germany
| | - Ilia Platzman
- Max Planck Institute for Medical Research, Department of Cellular Biophysics, Jahnstraße 29, D 69120, Heidelberg, Germany
- Department of Biophysical Chemistry, University of Heidelberg, Im Neuenheimer Feld 253, D 69120 Heidelberg, Germany
| | - Joachim P. Spatz
- Max Planck Institute for Medical Research, Department of Cellular Biophysics, Jahnstraße 29, D 69120, Heidelberg, Germany
- Department of Biophysical Chemistry, University of Heidelberg, Im Neuenheimer Feld 253, D 69120 Heidelberg, Germany
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196
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Velasco-Olmo A, Ormaetxea Gisasola J, Martinez Galvez JM, Vera Lillo J, Shnyrova AV. Combining patch-clamping and fluorescence microscopy for quantitative reconstitution of cellular membrane processes with Giant Suspended Bilayers. Sci Rep 2019; 9:7255. [PMID: 31076583 PMCID: PMC6510758 DOI: 10.1038/s41598-019-43561-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Accepted: 04/26/2019] [Indexed: 01/24/2023] Open
Abstract
In vitro reconstitution and microscopic visualization of membrane processes is an indispensable source of information about a cellular function. Here we describe a conceptionally novel free-standing membrane template that facilitates such quantitative reconstitution of membrane remodelling at different scales. The Giant Suspended Bilayers (GSBs) spontaneously swell from lipid lamella reservoir deposited on microspheres. GSBs attached to the reservoir can be prepared from virtually any lipid composition following a fast procedure. Giant unilamellar vesicles can be further obtained by GSB detachment from the microspheres. The reservoir stabilizes GSB during deformations, mechanical micromanipulations, and fluorescence microscopy observations, while GSB-reservoir boundary enables the exchange of small solutes with GSB interior. These unique properties allow studying macro- and nano-scale membrane deformations, adding membrane-active compounds to both sides of GSB membrane and applying patch-clamp based approaches, thus making GSB a versatile tool for reconstitution and quantification of cellular membrane trafficking events.
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Affiliation(s)
- Ariana Velasco-Olmo
- Biofisika Institute (UPV/EHU, CSIC) and Department of Biochemistry and Molecular Biology, University of the Basque Country, Bilbao, Spain
| | - Julene Ormaetxea Gisasola
- Biofisika Institute (UPV/EHU, CSIC) and Department of Biochemistry and Molecular Biology, University of the Basque Country, Bilbao, Spain
| | - Juan Manuel Martinez Galvez
- Biofisika Institute (UPV/EHU, CSIC) and Department of Biochemistry and Molecular Biology, University of the Basque Country, Bilbao, Spain
| | - Javier Vera Lillo
- Biofisika Institute (UPV/EHU, CSIC) and Department of Biochemistry and Molecular Biology, University of the Basque Country, Bilbao, Spain
| | - Anna V Shnyrova
- Biofisika Institute (UPV/EHU, CSIC) and Department of Biochemistry and Molecular Biology, University of the Basque Country, Bilbao, Spain.
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197
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Dimova R. Giant Vesicles and Their Use in Assays for Assessing Membrane Phase State, Curvature, Mechanics, and Electrical Properties. Annu Rev Biophys 2019; 48:93-119. [DOI: 10.1146/annurev-biophys-052118-115342] [Citation(s) in RCA: 67] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Giant unilamellar vesicles represent a promising and extremely useful model biomembrane system for systematic measurements of mechanical, thermodynamic, electrical, and rheological properties of lipid bilayers as a function of membrane composition, surrounding media, and temperature. The most important advantage of giant vesicles over other model membrane systems is that the membrane responses to external factors such as ions, (macro)molecules, hydrodynamic flows, or electromagnetic fields can be directly observed under the microscope. Here, we briefly review approaches for giant vesicle preparation and describe several assays used for deducing the membrane phase state and measuring a number of material properties, with further emphasis on membrane reshaping and curvature.
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Affiliation(s)
- Rumiana Dimova
- Max Planck Institute of Colloids and Interfaces, Science Park Golm, 14424 Potsdam, Germany
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198
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Odette WL, Payne NA, Khaliullin RZ, Mauzeroll J. Redox-Triggered Disassembly of Nanosized Liposomes Containing Ferrocene-Appended Amphiphiles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:5608-5616. [PMID: 30916976 DOI: 10.1021/acs.langmuir.8b04267] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We report a redox-responsive liposomal system capable of oxidatively triggered disassembly. We describe the synthesis, electrochemical characterization, and incorporation into vesicles of an alternative redox lipid with significantly improved synthetic efficiency and scalability compared to a ferrocene-appended phospholipid previously employed by our group in giant vesicles. The redox-triggered disassembly of both redox lipids is examined in nanosized liposomes as well as the influence of cholesterol mole fraction on liposome disassembly and suitability of various chemical oxidants for in vitro disassembly experiments. Electronic structure density functional theory calculations of membrane-embedded ferrocenes are provided to characterize the role of charge redistribution in the initial stages of the disassembly process.
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Affiliation(s)
- William L Odette
- Department of Chemistry , McGill University , 801 Sherbrooke Street West , Montreal , Quebec H3A OB8 , Canada
| | - Nicholas A Payne
- Department of Chemistry , McGill University , 801 Sherbrooke Street West , Montreal , Quebec H3A OB8 , Canada
| | - Rustam Z Khaliullin
- Department of Chemistry , McGill University , 801 Sherbrooke Street West , Montreal , Quebec H3A OB8 , Canada
| | - Janine Mauzeroll
- Department of Chemistry , McGill University , 801 Sherbrooke Street West , Montreal , Quebec H3A OB8 , Canada
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199
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Liu Y, Lipowsky R, Dimova R. Giant Vesicles Encapsulating Aqueous Two-Phase Systems: From Phase Diagrams to Membrane Shape Transformations. Front Chem 2019; 7:213. [PMID: 31024898 PMCID: PMC6465328 DOI: 10.3389/fchem.2019.00213] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Accepted: 03/18/2019] [Indexed: 12/22/2022] Open
Abstract
In this review, we summarize recent studies on giant unilamellar vesicles enclosing aqueous polymer solutions of dextran and poly(ethylene glycol) (PEG), highlighting recent results from our groups. Phase separation occurs for these polymer solutions with concentration above a critical value at room temperature. We introduce approaches used for constructing the phase diagram of such aqueous two-phase system by titration, density and gel permeation chromatography measurements of the coexisting phases. The ultralow interfacial tension of the resulting water-water interface is investigated over a broad concentration range close to the critical point. The scaling exponent of the interfacial tension further away from the critical point agrees well with mean field theory, but close to this point, the behavior disagrees with the Ising value of 1.26. The latter discrepancy arises from the molar mass fractionation of dextran between coexisting phases. Upon encapsulation of the PEG–dextran system into giant vesicles followed by osmotic deflation, the vesicle membrane becomes completely or partially wetted by the aqueous phases, which is controlled by the phase behavior of the polymer mixture and the lipid composition. Deflation leads to a reduction of the vesicle volume and generates excess area of the membrane, which can induce interesting transformations of the vesicle morphology such as vesicle budding. More dramatically, the spontaneous formation of many membrane nanotubes protruding into the interior vesicle compartment reveals a substantial asymmetry and spontaneous curvature of the membrane segments in contact with the PEG-rich phase, arising from the asymmetric adsorption of polymer molecules onto the two leaflets of the bilayers. These membrane nanotubes explore the whole PEG-rich phase for the completely wetted membrane but adhere to the liquid-liquid interface as the membrane becomes partially wetted. Quantitative estimates of the spontaneous curvature are obtained by analyzing different aspects of the tubulated vesicles, which reflect the interplay between aqueous phase separation and spontaneous curvature. The underlying mechanism for the curvature generation is provided by the weak adsorption of PEG onto the lipid bilayers, with a small binding affinity of about 1.6 kBT per PEG chain. Our study builds a bridge between nanoscopic membrane shapes and membrane-polymer interactions.
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Affiliation(s)
- Yonggang Liu
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, China
| | - Reinhard Lipowsky
- Department of Theory and Bio-Systems, Max Planck Institute of Colloids and Interfaces, Potsdam, Germany
| | - Rumiana Dimova
- Department of Theory and Bio-Systems, Max Planck Institute of Colloids and Interfaces, Potsdam, Germany
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200
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Karal MAS, Rahman M, Ahamed MK, Shibly SUA, Ahmed M, Shakil MM. Low cost non-electromechanical technique for the purification of giant unilamellar vesicles. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2019; 48:349-359. [PMID: 30918998 DOI: 10.1007/s00249-019-01363-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2018] [Revised: 02/20/2019] [Accepted: 03/18/2019] [Indexed: 12/27/2022]
Abstract
Lipid membranes of giant unilamellar vesicles (GUVs) with diameters greater than 10 μm are promising model membranes for investigating the physical and biological properties of the biomembranes of cells. These are extensively used for the study of the interaction of various membrane-active agents, where purified and similar-size oil-free GUVs are necessary. Although the existing membrane filtering method provides the required quality and quantity of GUVs, it includes a relatively expensive double-headed peristaltic pump. In our proposed non-electromechanical technique, gravity is used to maintain the flow of buffer, wherein the flow rate of buffer with the suspension of GUVs is controlled by a locally available low cost roller clamp regulator. We have characterized the results of this non-electromechanical approach in terms of size distribution, average size, flow rate and efficiency for dioleoylphosphatidylglycerol (DOPG)/dioleoylphosphatidylcholine (DOPC)-GUVs prepared by the natural swelling method. The technique purifies the GUVs by removing the non-entrapped solutes at an optimum flow rate 1.0-2.0 mL/min. In addition, it gives similar results to the pump-driven membrane filtering method. Therefore, it might be a cost effective technique for the purification of GUVs without employing any electromechanical devices.
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Affiliation(s)
- Mohammad Abu Sayem Karal
- Biophysics Research Laboratory, Department of Physics, Bangladesh University of Engineering and Technology, Dhaka, 1000, Bangladesh.
| | - Mostafizur Rahman
- Biophysics Research Laboratory, Department of Physics, Bangladesh University of Engineering and Technology, Dhaka, 1000, Bangladesh
| | - Md Kabir Ahamed
- Biophysics Research Laboratory, Department of Physics, Bangladesh University of Engineering and Technology, Dhaka, 1000, Bangladesh
| | | | - Marzuk Ahmed
- Biophysics Research Laboratory, Department of Physics, Bangladesh University of Engineering and Technology, Dhaka, 1000, Bangladesh
| | - Md Mostofa Shakil
- Biophysics Research Laboratory, Department of Physics, Bangladesh University of Engineering and Technology, Dhaka, 1000, Bangladesh
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