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Geisler R, Pedersen MC, Preisig N, Hannappel Y, Prévost S, Dattani R, Arleth L, Hellweg T. Aescin - a natural soap for the formation of lipid nanodiscs with tunable size. SOFT MATTER 2021; 17:1888-1900. [PMID: 33410858 DOI: 10.1039/d0sm02043e] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The saponin β-aescin from the seed extract of the horse chestnut tree Aesculus hippocastanum has demonstrated a beneficial role in clinical therapy which is in part related to its strong interaction with biological membranes. In this context the present work investigates the self-assembly of nm-sized discoidal lipid nanoparticles composed of β-aescin and the phospholipid 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC). The discoidal lipid nanoparticles reassemble from small discs into larger discs, ribbons and finally stacks of sheets upon heating from gel-phase to fluid phase DMPC. The morphological transition of the lipid nano-particles is mainly triggered by the phospholipid phase state change. The final morphology depends on the phospholipid-to-saponin ratio and the actual temperature. The study is conducted by small-angle X-ray scattering (SAXS) and transmission (TEM) and freeze fracture electron microscopy (FFEM) are used to cover larger length scales. Two different models, representing a disc and ribbon-like shape are applied to the SAXS data, evaluating possible geometries and molecular mixing of the nano-particles. The stacked sheets are analysed by the Caillé theory.
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Affiliation(s)
- Ramsia Geisler
- Physical and Biophysical Chemistry, Bielefeld University, Universitätsstr. 25, 33615 Bielefeld, Germany.
| | - Martin Cramer Pedersen
- Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
| | - Natalie Preisig
- Institute of Physical Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Yvonne Hannappel
- Institute of Physical Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Sylvain Prévost
- ESRF-The European Synchrotron, 71, Avenue des Martyrs, 38000 Grenoble Cedex 9, France
| | - Rajeev Dattani
- ESRF-The European Synchrotron, 71, Avenue des Martyrs, 38000 Grenoble Cedex 9, France
| | - Lise Arleth
- Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
| | - Thomas Hellweg
- Physical and Biophysical Chemistry, Bielefeld University, Universitätsstr. 25, 33615 Bielefeld, Germany.
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2
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Gao YG, My Le L, Alam A, Brown R. A Simple and Straightforward Approach for Generating Small, Stable, Homogeneous, Unilamellar 1-Palmitoyl 2-Oleoyl Phosphatidylcholine (POPC) Bilayer Vesicles. Bio Protoc 2021; 11:e4271. [DOI: 10.21769/bioprotoc.4271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Revised: 09/28/2021] [Accepted: 09/30/2021] [Indexed: 11/02/2022] Open
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3
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Li M, Heller WT, Liu CH, Gao CY, Cai Y, Hou Y, Nieh MP. Effects of fluidity and charge density on the morphology of a bicellar mixture - A SANS study. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2020; 1862:183315. [PMID: 32304755 DOI: 10.1016/j.bbamem.2020.183315] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2019] [Revised: 04/11/2020] [Accepted: 04/13/2020] [Indexed: 01/28/2023]
Abstract
The spontaneously formed structures of physiologically relevant lipid model membranes made of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine, 1-palmitoyl-2-oleoyl-sn-glycero-3-phospho-(1'-rac-glycerol) and 1,2-hexanoyl-sn-glycero-3-phosphocholine have been evaluated in depth using small angle neutron scattering. Although a common molar ratio of long- to short- chain phospholipids (~4) as reported in many bicellar mixtures was used, discoidal bicelles were not found as the major phase throughout the range of lipid concentration and temperature studied, indicating that the required condition for the formation of bicelle is the immiscibility between the long- and short- chain lipids, which were in the gel and Lα phases, respectively, in previous reports. In this study, all lipids are in the Lα phase. The characterization outcome suggests that the spontaneous structures tie strongly with the physical parameters of the system such as melting transition temperature of the long-chain lipid, total lipid concentration and charge density of the system. Multilamellar vesicles, unilamellar vesicles, ribbons and perforated lamellae can be obtained based on the analysis of the small angle neutron scattering results, leading to the construction of structural diagrams. This report provides the important map to choose suitable lipid systems for the structural study of membrane-associated proteins, design of theranostic nanocarriers or other related research fields.
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Affiliation(s)
- Ming Li
- Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, 06269, USA
| | - William T Heller
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Chung-Hao Liu
- Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, 06269, USA
| | - Carrie Y Gao
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Yutian Cai
- Department of Polymer Material Science and Engineering, College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha, Hunan 410000, China
| | - Yiming Hou
- Department of Polymer Material Science and Engineering, College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha, Hunan 410000, China
| | - Mu-Ping Nieh
- Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, 06269, USA; Department of Chemical & Biomolecular Engineering, University of Connecticut, Storrs 06269, USA; Department of Biomedical Engineering, University of Connecticut, Storrs 06269, USA.
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4
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Gao YG, My Le LT, Zhai X, Boldyrev IA, Mishra SK, Tischer A, Murayama T, Nishida A, Molotkovsky JG, Alam A, Brown RE. Measuring Lipid Transfer Protein Activity Using Bicelle-Dilution Model Membranes. Anal Chem 2020; 92:3417-3425. [PMID: 31970977 DOI: 10.1021/acs.analchem.9b05523] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
In vitro assessment of lipid intermembrane transfer activity by cellular proteins typically involves measurement of either radiolabeled or fluorescently labeled lipid trafficking between vesicle model membranes. Use of bilayer vesicles in lipid transfer assays usually comes with inherent challenges because of complexities associated with the preparation of vesicles and their rather short "shelf life". Such issues necessitate the laborious task of fresh vesicle preparation to achieve lipid transfer assays of high quality, precision, and reproducibility. To overcome these limitations, we have assessed model membrane generation by bicelle dilution for monitoring the transfer rates and specificity of various BODIPY-labeled sphingolipids by different glycolipid transfer protein (GLTP) superfamily members using a sensitive fluorescence resonance energy transfer approach. Robust, protein-selective sphingolipid transfer is observed using donor and acceptor model membranes generated by dilution of 0.5 q-value mixtures. The sphingolipid transfer rates are comparable to those observed between small bilayer vesicles produced by sonication or ethanol injection. Among the notable advantages of using bicelle-generated model membranes are (i) easy and straightforward preparation by means that avoid lipid fluorophore degradation and (ii) long "shelf life" after production (≥6 days) and resilience to freeze-thaw storage. The bicelle-dilution-based assay is sufficiently robust, sensitive, and stable for application, not only to purified LTPs but also for LTP activity detection in crude cytosolic fractions of cell homogenates.
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Affiliation(s)
- Yong-Guang Gao
- The Hormel Institute , University of Minnesota , 801 16th Avenue NE , Austin , Minnesota 55912 , United States
| | - Le Thi My Le
- The Hormel Institute , University of Minnesota , 801 16th Avenue NE , Austin , Minnesota 55912 , United States
| | - Xiuhong Zhai
- The Hormel Institute , University of Minnesota , 801 16th Avenue NE , Austin , Minnesota 55912 , United States
| | - Ivan A Boldyrev
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry , Russian Academy of Sciences , 117997 Moscow , Russian Federation
| | - Shrawan K Mishra
- The Hormel Institute , University of Minnesota , 801 16th Avenue NE , Austin , Minnesota 55912 , United States
| | - Alexander Tischer
- Mayo Clinic Division of Hematology , 150 Third Street SW , Stabile Building, Rochester , Minnesota 55905 , United States
| | - Toshihiko Murayama
- Graduate School of Pharmaceutical Sciences , Chiba University , Inohana 1-8-1 , Chuo-ku, Chiba 260-8675 , Japan
| | - Atsushi Nishida
- Graduate School of Pharmaceutical Sciences , Chiba University , Inohana 1-8-1 , Chuo-ku, Chiba 260-8675 , Japan
| | - Julian G Molotkovsky
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry , Russian Academy of Sciences , 117997 Moscow , Russian Federation
| | - Amer Alam
- The Hormel Institute , University of Minnesota , 801 16th Avenue NE , Austin , Minnesota 55912 , United States
| | - Rhoderick E Brown
- The Hormel Institute , University of Minnesota , 801 16th Avenue NE , Austin , Minnesota 55912 , United States
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5
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Geisler R, Pedersen MC, Hannappel Y, Schweins R, Prévost S, Dattani R, Arleth L, Hellweg T. Aescin-Induced Conversion of Gel-Phase Lipid Membranes into Bicelle-like Lipid Nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:16244-16255. [PMID: 31618036 DOI: 10.1021/acs.langmuir.9b02077] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Mixtures of the phospholipid 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) and the saponin β-aescin spontaneously form monodisperse, bilayered discoidal micelles (also known as "bicelles" or "nanodisks") in aqueous solution. Such bicelles form below the melting temperature of DMPC when the phospholipids are in the rigid Lβ' state and are precursors of spontaneously formed vesicles. The aescin concentration must be far above the cmcaescin (≈0.3-0.4 mM). It was found that the shape and size of the bicelles are tunable by composition. High amounts of aescin decrease the size of the bicelles from diameters of ∼300 Å at 7 mol % to ∼120 Å at 30 mol % β-aescin. The structures are scrutinized by complementary small-angle X-ray and neutron scattering experiments. The scattering curves are subsequently analyzed by a model-independent (indirect Fourier transform analysis) and a model-based approach where bicelles are described as polydisperse bilayer disks encircled by a β-aescin rim. Moreover, the monomodal distribution and low polydispersity of the samples were confirmed by photon correlation spectroscopy. The discoidal structures were visualized by transmission electron microscopy.
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Affiliation(s)
| | - Martin Cramer Pedersen
- Niels Bohr Institute , University of Copenhagen , Universitetsparken 5 , 2100 Copenhagen , Denmark
| | | | - Ralf Schweins
- Institut Laue-Langevin , DS/LSS, 71 Avenue des Martyrs , 38042 Grenoble Cedex 9 , France
| | - Sylvain Prévost
- ESRF-The European Synchrotron , 71 Avenue des Martyrs , 38043 Grenoble Cedex 9 , France
| | - Rajeev Dattani
- ESRF-The European Synchrotron , 71 Avenue des Martyrs , 38043 Grenoble Cedex 9 , France
| | - Lise Arleth
- Niels Bohr Institute , University of Copenhagen , Universitetsparken 5 , 2100 Copenhagen , Denmark
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6
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Fasanella A, Cosentino K, Beneduci A, Chidichimo G, Cazzanelli E, Barberi R, Castriota M. Thermal structural evolutions of DMPC-water biomimetic systems investigated by Raman Spectroscopy. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2018; 1860:1253-1258. [DOI: 10.1016/j.bbamem.2018.02.021] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Revised: 02/20/2018] [Accepted: 02/22/2018] [Indexed: 11/28/2022]
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7
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Cobo Solis AK, Correa NM, Molina PG. Determination of Benzyl-hexadecyldimethylammonium 1,4-Bis(2-ethylhexyl)sulfosuccinate Vesicle Permeability by Using Square Wave Voltammetry and an Enzymatic Reaction. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:12080-12086. [PMID: 28992699 DOI: 10.1021/acs.langmuir.7b03001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
This report describes the studies performed to determine the permeability coefficient value (P) of 1-naphthyl phosphate (1-NP) through the benzyl-hexadecyldimethylammonium 1,4-bis(2-ethylhexyl)sulfosuccinate (AOT-BHD) vesicle bilayer. 1-NP was added in the external phase and must cross the bilayer of the vesicle to react with the encapsulated enzyme (alkaline phosphatase) to yield 1-naphtholate (NPh-), the product of the enzymatic hydrolysis. This product is electrochemically detected, at basic pH value, by a square wave voltammetry technique, which can be a good alternative over the spectroscopic one, to measure the vesicle solutions because scattering (due to its turbidity) does not make any influence in the electrochemical signal. The experimental data allow us to propose a mathematical model, and a value of P = (1.00 ± 0.15) × 10-9 cm s-1 was obtained. Also, a value of P = (2.0 ± 0.5) × 10-9 cm s-1 was found by using an independent technique, ultraviolet-visible spectroscopy, for comparison. It is evident that the P values obtained from both the techniques are comparable (within the experimental error of both techniques) under the same experimental conditions. This study constitutes the first report of the 1-NP permeability determination in this new vesicle. We want to highlight the importance of the introduction of a new method and the electrochemical response of the product generated through an enzymatic reaction that occurs in the inner aqueous phase of the vesicle, where the enzyme is placed.
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Affiliation(s)
- Airam K Cobo Solis
- Departamento de Química, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto , Agencia Postal No. 3, 5800 Río Cuarto, Argentina
| | - N Mariano Correa
- Departamento de Química, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto , Agencia Postal No. 3, 5800 Río Cuarto, Argentina
| | - Patricia G Molina
- Departamento de Química, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto , Agencia Postal No. 3, 5800 Río Cuarto, Argentina
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8
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Frampton MB, Marquardt D, Letofsky-Papst I, Pabst G, Zelisko PM. Analysis of Trisiloxane Phosphocholine Bilayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:4948-4953. [PMID: 28471667 PMCID: PMC5462096 DOI: 10.1021/acs.langmuir.6b04162] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
We have synthesized unique siloxane phosphocholines and characterized their aggregates in aqueous solution. The siloxane phosphocholines form nearly monodisperse vesicles in aqueous solution without the need for secondary extrusion processes. The area/lipid, lipid volume, and bilayer thickness were determined from small-angle X-ray scattering experiments. The impetus for the spontaneous formation of unilamellar vesicles by these compounds is discussed.
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Affiliation(s)
- Mark B. Frampton
- Department of Chemistry and Centre for Biotechnology, Brock University, St. Catharines, Ontario, Canada
| | - Drew Marquardt
- Institute of Molecular Biosciences, Biophysics Division, University of Graz, NAWI Graz, Graz, 8010, Austria
- BioTechMed-Graz, Graz, 8010, Austria
| | - Ilse Letofsky-Papst
- Graz University of Technology, NAWI Graz, Institute for Electron Microscopy & Nanoanalysis and Center for Electron Microscopy, Steyrergasse 17, 8010 Graz, Austria
| | - Georg Pabst
- Institute of Molecular Biosciences, Biophysics Division, University of Graz, NAWI Graz, Graz, 8010, Austria
- BioTechMed-Graz, Graz, 8010, Austria
| | - Paul M. Zelisko
- Department of Chemistry and Centre for Biotechnology, Brock University, St. Catharines, Ontario, Canada
- Corresponding Author: Paul M. Zelisko
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9
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Cobo Solis AK, Mariano Correa N, Molina PG. Electrochemical and photophysical behavior of 1-naphthol in benzyl-n-hexadecyldimethylammonium 1,4-bis(2-ethylhexyl)sulfosuccinate large unilamellar vesicles. Phys Chem Chem Phys 2016; 18:15645-53. [DOI: 10.1039/c6cp01979j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The behavior of 1-naphthol and its partition process in LUVs formed from a new catanionic surfactant were studied by electrochemical and spectroscopic techniques.
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Affiliation(s)
- Airam K. Cobo Solis
- Departamento de Química
- Facultad de Ciencias Exactas
- Físico-Químicas y Naturales
- Universidad Nacional de Río Cuarto
- Río Cuarto
| | - N. Mariano Correa
- Departamento de Química
- Facultad de Ciencias Exactas
- Físico-Químicas y Naturales
- Universidad Nacional de Río Cuarto
- Río Cuarto
| | - Patricia G. Molina
- Departamento de Química
- Facultad de Ciencias Exactas
- Físico-Químicas y Naturales
- Universidad Nacional de Río Cuarto
- Río Cuarto
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10
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Xia Y, Li M, Charubin K, Liu Y, Heberle FA, Katsaras J, Jing B, Zhu Y, Nieh MP. Effects of Nanoparticle Morphology and Acyl Chain Length on Spontaneous Lipid Transfer Rates. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:12920-8. [PMID: 26540211 DOI: 10.1021/acs.langmuir.5b03291] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
We report on studies of lipid transfer rates between different morphology nanoparticles and lipids with different length acyl chains. The lipid transfer rate of dimyristoylphosphatidylcholine (di-C14, DMPC) in discoidal "bicelles" (0.156 h(-1)) is 2 orders of magnitude greater than that of DMPC vesicles (ULVs) (1.1 × 10(-3) h(-1)). For both bicellar and ULV morphologies, increasing the acyl chain length by two carbons [going from di-C14 DMPC to di-C16, dipalmitoylphosphatidylcholine (DPPC)] causes lipid transfer rates to decrease by more than 2 orders of magnitude. Results from small angle neutron scattering (SANS), differential scanning calorimetry (DSC), and fluorescence correlation spectroscopy (FCS) are in good agreement. The present studies highlight the importance of lipid dynamic processes taking place in different morphology biomimetic membranes.
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Affiliation(s)
- Yan Xia
- Department of Chemical and Biomolecular Engineering, University of Connecticut , Storrs, Connecticut 06269, United States
| | - Ming Li
- Polymer Program, Institute of Materials Science, University of Connecticut , Storrs, Connecticut 06269, United States
| | - Kamil Charubin
- Department of Chemical and Biomolecular Engineering, University of Connecticut , Storrs, Connecticut 06269, United States
| | - Ying Liu
- Department of Chemical and Biomolecular Engineering, University of Connecticut , Storrs, Connecticut 06269, United States
| | - Frederick A Heberle
- Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831 United States
- Joint Institute for Neutron Sciences, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
| | - John Katsaras
- Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831 United States
- Department of Physics and Astronomy, University of Tennessee , Knoxville, Tennessee 37996, United States
- Joint Institute for Neutron Sciences, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
| | - Benxin Jing
- Department of Chemical and Biomolecular Engineering, University of Notre Dame , Notre Dame, Indiana 46556, United States
| | - Yingxi Zhu
- Department of Chemical and Biomolecular Engineering, University of Notre Dame , Notre Dame, Indiana 46556, United States
- Department of Chemical Engineering and Materials Science, Wayne State University , Detroit, Michigan 48202 United States
| | - Mu-Ping Nieh
- Department of Chemical and Biomolecular Engineering, University of Connecticut , Storrs, Connecticut 06269, United States
- Polymer Program, Institute of Materials Science, University of Connecticut , Storrs, Connecticut 06269, United States
- Department of Biomedical Engineering, University of Connecticut , Storrs, Connecticut 06269, United States
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11
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Zacheo A, Quarta A, Zizzari A, Monteduro AG, Maruccio G, Arima V, Gigli G. One step preparation of quantum dot-embedded lipid nanovesicles by a microfluidic device. RSC Adv 2015. [DOI: 10.1039/c5ra18862h] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Synthetic carriers that mimic “natural lipid-based vesicles” (micro/nanovesicles, exosomes) have found broad application in biomedicine for the delivery of biomolecules and drugs. Here, an innovative approach for their production is presented.
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Affiliation(s)
- A. Zacheo
- Department of Mathematics and Physics “Ennio De Giorgi”
- Università del Salento
- 73100 Lecce
- Italy
- CNR–Istituto di Nanotecnologia (NANOTEC)
| | - A. Quarta
- CNR–Istituto di Nanotecnologia (NANOTEC)
- 73100 Lecce
- Italy
| | - A. Zizzari
- Department of Mathematics and Physics “Ennio De Giorgi”
- Università del Salento
- 73100 Lecce
- Italy
| | - A. G. Monteduro
- Department of Mathematics and Physics “Ennio De Giorgi”
- Università del Salento
- 73100 Lecce
- Italy
- CNR–Istituto di Nanotecnologia (NANOTEC)
| | - G. Maruccio
- Department of Mathematics and Physics “Ennio De Giorgi”
- Università del Salento
- 73100 Lecce
- Italy
- CNR–Istituto di Nanotecnologia (NANOTEC)
| | - V. Arima
- CNR–Istituto di Nanotecnologia (NANOTEC)
- 73100 Lecce
- Italy
| | - G. Gigli
- Department of Mathematics and Physics “Ennio De Giorgi”
- Università del Salento
- 73100 Lecce
- Italy
- CNR–Istituto di Nanotecnologia (NANOTEC)
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12
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Banerjee C, Mandal S, Ghosh S, Kuchlyan J, Kundu N, Sarkar N. Unique characteristics of ionic liquids comprised of long-chain cations and anions: a new physical insight. J Phys Chem B 2013; 117:3927-34. [PMID: 23472714 DOI: 10.1021/jp4015405] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We have designed a unique class of surface active ionic liquids (SAILs) and utilized them to prepare IL-in-oil microemulsions as well as large unilamellar vesicles (LUVs). The IL-in-oil microemulsions were characterized by a phase behavior study, regular swelling behavior, and also by spectral shift of coumarin-480 probe molecules. The LUVs were characterized by dynamic light scattering and transmission electron microscope measurements. Our work opens up the possibility of creating a huge number of IL-in-oil microemulsions as well as LUVs simply by replacing the cation of NaAOT with a long chain cation.
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Affiliation(s)
- Chiranjib Banerjee
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India
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13
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Dürr UH, Soong R, Ramamoorthy A. When detergent meets bilayer: birth and coming of age of lipid bicelles. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2013; 69:1-22. [PMID: 23465641 PMCID: PMC3741677 DOI: 10.1016/j.pnmrs.2013.01.001] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2012] [Accepted: 08/30/2012] [Indexed: 05/12/2023]
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14
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Shin S, Umh HN, Kim Y. Simple Analysis for Interaction between Nanoparticles and Dye-Containing Vesicles as a Biomimetic Cell-Membrane. B KOREAN CHEM SOC 2013. [DOI: 10.5012/bkcs.2013.34.1.231] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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15
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Curschellas C, Kohlbrecher J, Geue T, Fischer P, Schmitt B, Rouvet M, Windhab EJ, Limbach HJ. Foams stabilized by multilamellar polyglycerol ester self-assemblies. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:38-49. [PMID: 23214931 DOI: 10.1021/la3029116] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The importance of surfactant self-assemblies in foam stabilization is well-known. The aim of the current study was to investigate the self-assemblies of the nonionic surfactant polyglycerol ester (PGE) in bulk solutions, at the interface and within foams, using a combined approach of small-angle neutron scattering, neutron reflectivity, and electron microscopy. PGE bulk solutions contain vesicles as well as open lamellar structures. Upon heating of the solutions the lamellar spacing increases, with significant differences in the presence of NaCl or CaCl(2) as compared to the standard solution. The adsorption of the multilamellar structures present in the bulk solutions lead to a multilayered film at the air-water interface. The ordering within this film was increased as a result of a 20% area compression mimicking a coalescence event. Finally, PGE foams were shown to be stabilized not only by strong interfacial films but also by agglomerated self-assemblies within the interstitial areas of the foams.
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Affiliation(s)
- Corina Curschellas
- Laboratory of Food Process Engineering, ETH Zürich, Schmelzbergstrasse 9, 8092 Zürich, Switzerland.
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16
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Kunze A, Bally M, Höök F, Larson G. Equilibrium-fluctuation-analysis of single liposome binding events reveals how cholesterol and Ca2+ modulate glycosphingolipid trans-interactions. Sci Rep 2013; 3:1452. [PMID: 23486243 PMCID: PMC3596795 DOI: 10.1038/srep01452] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2012] [Accepted: 03/01/2013] [Indexed: 12/18/2022] Open
Abstract
Carbohydrate-carbohydrate interactions (CCIs) are of central importance for several biological processes. However, the ultra-weak nature of CCIs generates difficulties in studying this interaction, thus only little is known about CCIs. Here we present a highly sensitive equilibrium-fluctuation-analysis of single liposome binding events to supported lipid bilayers (SLBs) based on total internal reflection fluorescence (TIRF) microscopy that allows us to determine apparent kinetic rate constants of CCIs. The liposomes and SLBs both contained natural Le(x) glycosphingolipids (Galβ4(Fucα3)GlcNAcβ3Galβ4Glcβ1Cer), which were employed to mimic cell-cell contacts. The kinetic parameters of the self-interaction between Le(x)-containing liposomes and SLBs were measured and found to be modulated by bivalent cations. Even more interestingly, upon addition of cholesterol, the strength of the CCIs increases, suggesting that this interaction is strongly influenced by a cholesterol-dependent presentation and/or spatial organization of glycosphingolipids in cell membranes.
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Affiliation(s)
- Angelika Kunze
- Department of Clinical Chemistry and Transfusion Medicine, Sahlgrenska Academy, University of Gothenburg, SE-413 45 Göteborg, Sweden
| | - Marta Bally
- Department of Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden
| | - Fredrik Höök
- Department of Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden
| | - Göran Larson
- Department of Clinical Chemistry and Transfusion Medicine, Sahlgrenska Academy, University of Gothenburg, SE-413 45 Göteborg, Sweden
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Umh HN, Kim Y. Simple Analysis for Interaction between Nanoparticles and Fluorescence Vesicle as a Biomimetic Cell for Toxicological Studies. B KOREAN CHEM SOC 2012. [DOI: 10.5012/bkcs.2012.33.12.3998] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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18
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Shi D, Sfintes G, Laursen BW, Simonsen JB. Fluorescent and highly stable unimodal DMPC based unilamellar vesicles formed by spontaneous curvature. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:8608-8615. [PMID: 22594640 DOI: 10.1021/la301454y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The formation of uniform and highly stable unilamellar vesicles (ULVs) and the theory behind it are ongoing tasks within the vesicle community. Herein, we report the formation of highly stable, fluorescent, and unimodal 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) based ULVs with an average size of ~100 nm, as determined by cryogenic transmission electron microscopy (cryo-TEM) and dynamic light scattering (DLS). The ULVs are formed by mixing a two-component powder mixture or mixed lipid film of DMPC and 5 mol % of a novel amphiphilic carbenium salt, sodium 2-didecylamino-6,10-bis(N-methyltaruino)-4,8,12-trioxatriangulenium (Na-DSA) in aqueous solution when subjected to shaking. We propose that the high stability and the unimodal size distribution of the 5% DSA ULVs confirmed by DLS studies are a product of spontaneous curvature. UV-vis absorption/emission studies reveal that the structure of DSA promotes a strong interaction between the DMPC and the DSA to take place due to the complementary charge distribution of the DSA and DMPC head groups. The strong interaction may introduce an asymmetric amphiphile composition in the inner and outer leaflet of the bilayer which drives the spontaneous curvature.
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Affiliation(s)
- Dong Shi
- Nano-Science Center & Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark
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19
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Zhang G, Huang R, Li Z, Yang X, Chen X, Xia W, Sun X, Yang G, Gao C, Gou Z. Understanding the influence of alendronate on the morphology and phase transformation of apatitic precursor nanocrystals. J Inorg Biochem 2012; 113:1-8. [PMID: 22687488 DOI: 10.1016/j.jinorgbio.2012.03.011] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2012] [Revised: 03/28/2012] [Accepted: 03/29/2012] [Indexed: 10/28/2022]
Abstract
Bisphosphonates (BPs) are a class of synthetic pyrophosphate analogs that can prevent the loss of bone mass, given orally to treat postmenopuasal osteoporosis. It is not clear yet if the benefits of BPs include the possibility of affecting bone apatitic precursors transition for bone consolidation except for encouraging osteoclasts to undergo apoptosis. Furthermore, the complexity of the in vivo system makes it difficult to isolate and study such extracellular topographical cues that trigger bone turnover response. Herein, we proposed a wet-chemical approach employing alendronate sodium (AS) as a guide of hydroxyapatite (HA) precursor growth and conversion which was initiated from the nucleantion of octacalcium phosphate (OCP) in a cell membrane-mimicking surfactant micelle aqueous system. The nanocrystal clusters of dicalcium phosphate dihydrate (DCPD) and OCP nanocryatals were readily precipitated within a relatively narrow AS concentration range (2-8 μM). However, such low concentrations of AS seemed to stabilize the more acidic phases, and to delay the transformation into HA, to an extent which increased on increasing AS concentration. In contrast, at a slight higher concentrations (16-32 μM), AS promoted HA precipitation after ageing for 1h. It was found that the effect of AS on the phase selectivity of apatitic precursors was concentration-dependent within a prolonged ageing time stage (0.5-168 h). The AS-assisted reactions in vitro offer an expedient way to understand the underlying implementarity between bone and BPs for bone consolidation, and to improve our understanding of benefit of BP dosages on bone turnover and trauma healing.
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Affiliation(s)
- Guiling Zhang
- Bio-Nanomaterials and Regeneration Medicine Research Division, Zhejiang-California International Nanosystems Institute, Zhejiang University, Hangzhou 310029, China
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20
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Barbosa-Barros L, Rodríguez G, Barba C, Cócera M, Rubio L, Estelrich J, López-Iglesias C, de la Maza A, López O. Bicelles: lipid nanostructured platforms with potential dermal applications. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2012; 8:807-818. [PMID: 22114051 DOI: 10.1002/smll.201101545] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2011] [Revised: 09/26/2011] [Indexed: 05/31/2023]
Abstract
Bicelles emerge as promising membrane models, and because of their attractive combination of lipid composition, small size and morphological versatility, they become new targets in skin research. Bicelles are able to modify skin biophysical parameters and modulate the skin's barrier function, acting to enhance drug penetration. Because of their nanostructured assemblies, bicelles have the ability to penetrate through the narrow intercellular spaces of the stratum corneum of the skin to reinforce its lipid lamellae. The bicelle structure also allows for the incorporation of different molecules that can be carried through the skin layers. All of these characteristics can be modulated by varying the lipid composition and experimental conditions. The remarkable versatility of bicelles is their most important characteristic, which makes their use possible in various fields. This system represents a platform for dermal applications. In this review, an overview of the main properties of bicelles and their effects on the skin are presented.
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Affiliation(s)
- Lucyanna Barbosa-Barros
- Dept. of Chemical Technology and Surfactants, Institut de Química Avançada de Catalunya-I.Q.A.C., Consejo Superior de Investigaciones Científicas-C.S.I.C., C/Jordi Girona 18-26, 08034 Barcelona, Spain.
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21
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Nieh MP, Dolinar P, Kučerka N, Kline SR, Debeer-Schmitt LM, Littrell KC, Katsaras J. Formation of kinetically trapped nanoscopic unilamellar vesicles from metastable nanodiscs. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:14308-14316. [PMID: 21951150 DOI: 10.1021/la2023314] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Zwitterionic long-chain lipids (e.g., dimyristoyl phosphatidylcholine, DMPC) spontaneously form onion-like, thermodynamically stable structures in aqueous solutions (commonly known as multilamellar vesicles, or MLVs). It has also been reported that the addition of zwitterionic short-chain (i.e., dihexanoyl phosphatidylcholine, DHPC) and charged long-chain (i.e., dimyristoyl phosphatidylglycerol, DMPG) lipids to zwitterionic long-chain lipid solutions results in the formation of unilamellar vesicles (ULVs). Here, we report a kinetic study on lipid mixtures composed of DMPC, DHPC, and DMPG. Two membrane charge densities (i.e., [DMPG]/[DMPC] = 0.01 and 0.001) and two solution salinities (i.e., [NaCl] = 0 and 0.2 M) are investigated. Upon dilution of the high-concentration samples at 50 °C, thermodynamically stable MLVs are formed, in the case of both weakly charged and high salinity solution mixtures, implying that the electrostatic interactions between bilayers are insufficient to cause MLVs to unbind. Importantly, in the case of these samples small angle neutron scattering (SANS) data show that, initially, nanodiscs (also known as bicelles) or bilayered ribbons form at low temperatures (i.e., 10 °C), but transform into uniform size, nanoscopic ULVs after incubation at 10 °C for 20 h, indicating that the nanodisc is a metastable structure. The instability of nanodiscs may be attributed to low membrane rigidity due to a reduced charge density and high salinity. Moreover, the uniform-sized ULVs persist even after being heated to 50 °C, where thermodynamically stable MLVs are observed. This result clearly demonstrates that these ULVs are kinetically trapped, and that the mechanical properties (e.g., bending rigidity) of 10 °C nanodiscs favor the formation of nanoscopic ULVs over that of MLVs. From a practical point of view, this method of forming uniform-sized ULVs may lend itself to their mass production, thus making them economically feasible for medical applications that depend on monodisperse lipid-based systems for therapeutic and diagnostic purposes.
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Affiliation(s)
- Mu-Ping Nieh
- Department of Chemical, Materials & Biomolecular Engineering, Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, USA.
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22
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Iqbal U, Albaghdadi H, Nieh MP, Tuor UI, Mester Z, Stanimirovic D, Katsaras J, Abulrob A. Small unilamellar vesicles: a platform technology for molecular imaging of brain tumors. NANOTECHNOLOGY 2011; 22:195102. [PMID: 21436507 DOI: 10.1088/0957-4484/22/19/195102] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Molecular imaging enables the non-invasive investigation of cellular and molecular processes. Although there are challenges to overcome, the development of targeted contrast agents to increase the sensitivity of molecular imaging techniques is essential for their clinical translation. In this study, spontaneously forming, small unilamellar vesicles (sULVs) (30 nm diameter) were used as a platform to build a bimodal (i.e., optical and magnetic resonance imaging (MRI)) targeted contrast agent for the molecular imaging of brain tumors. sULVs were loaded with a gadolinium (Gd) chelated lipid (Gd-DPTA-BOA), functionalized with targeting antibodies (anti-EGFR monoclonal and anti-IGFBP7 single domain), and incorporated a near infrared dye (Cy5.5). The resultant sULVs were characterized in vitro using small angle neutron scattering (SANS), phantom MRI and dynamic light scattering (DLS). Antibody targeted and nontargeted Gd loaded sULVs labeled with Cy5.5 were assessed in vivo in a brain tumor model in mice using time domain optical imaging and MRI. The results demonstrated that a spontaneously forming, nanosized ULVs loaded with a high payload of Gd can selectively target and image, using MR and optical imaging, brain tumor vessels when functionalized with anti-IGFBP7 single domain antibodies. The unique features of these targeted sULVs make them promising molecular MRI contrast agents.
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Affiliation(s)
- Umar Iqbal
- Institute for Biological Sciences, National Research Council of Canada, Ottawa, ON, Canada
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23
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Ghosh S, Khatua D, Dey J. Interaction between zwitterionic and anionic surfactants: spontaneous formation of zwitanionic vesicles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:5184-5192. [PMID: 21462963 DOI: 10.1021/la1040147] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The physicochemical properties, such as critical micelle concentration (cmc), surface tension at cmc (γ(cmc)), and surface activity parameters of the mixtures of a new amino acid-based zwitterionic surfactant, N-(n-dodecyl-2-aminoethanoyl)-glycine (C(12)Gly) and an anionic surfactant, sodium dodecyl sulfate (SDS) at different molar fractions, X(1) (= [C(12)Gly]/([C(12)Gly] + [SDS])) of C(12)Gly were studied. A synergistic interaction was observed between the surfactants in mixtures of different X(1). The self-organization of the mixtures at different molar fractions, concentrations, and pH was investigated. Fluorescence depolarization studies in combination with dynamic light scattering, and transmission electron microscopic and confocal fluorescence microscopic images suggested the formation of bilayer vesicles in dilute solutions of SDS rich mixtures with X(1) ≤ 0.17 in the pH range 7.0 to 9.0. However, the electronic micrographs showed structures with fingerprint-like texture in moderately dilute to concentrated C(12)Gly/SDS mixture at X(1) = 0.50. The vesicles were observed to transform into small micelles upon lowering the solution pH and upon increase of total surfactant concentration in mixtures with X(1) ≤ 0.17. However, decrease of SDS content transformed vesicles into wormlike micelles. The structural transitions were correlated with bulk viscosity of the binary mixtures.
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Affiliation(s)
- Sampad Ghosh
- Department of Chemistry, Indian Institute of Technology, Kharagpur-721 302, India
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24
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Nieh MP, Raghunathan VA, Pabst G, Harroun T, Nagashima K, Morales H, Katsaras J, Macdonald P. Temperature driven annealing of perforations in bicellar model membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:4838-4847. [PMID: 21438512 DOI: 10.1021/la104750x] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Bicellar model membranes composed of 1,2-dimyristoylphosphatidylcholine (DMPC) and 1,2-dihexanoylphosphatidylcholine (DHPC), with a DMPC/DHPC molar ratio of 5, and doped with the negatively charged lipid 1,2-dimyristoylphosphatidylglycerol (DMPG), at DMPG/DMPC molar ratios of 0.02 or 0.1, were examined using small angle neutron scattering (SANS), (31)P NMR, and (1)H pulsed field gradient (PFG) diffusion NMR with the goal of understanding temperature effects on the DHPC-dependent perforations in these self-assembled membrane mimetics. Over the temperature range studied via SANS (300-330 K), these bicellar lipid mixtures exhibited a well-ordered lamellar phase. The interlamellar spacing d increased with increasing temperature, in direct contrast to the decrease in d observed upon increasing temperature with otherwise identical lipid mixtures lacking DHPC. (31)P NMR measurements on magnetically aligned bicellar mixtures of identical composition indicated a progressive migration of DHPC from regions of high curvature into planar regions with increasing temperature, and in accord with the "mixed bicelle model" (Triba, M. N.; Warschawski, D. E.; Devaux, P. E. Biophys. J.2005, 88, 1887-1901). Parallel PFG diffusion NMR measurements of transbilayer water diffusion, where the observed diffusion is dependent on the fractional surface area of lamellar perforations, showed that transbilayer water diffusion decreased with increasing temperature. A model is proposed consistent with the SANS, (31)P NMR, and PFG diffusion NMR data, wherein increasing temperature drives the progressive migration of DHPC out of high-curvature regions, consequently decreasing the fractional volume of lamellar perforations, so that water occupying these perforations redistributes into the interlamellar volume, thereby increasing the interlamellar spacing.
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Affiliation(s)
- Mu-Ping Nieh
- Chemical, Materials and Biomolecular Engineering Department, Institute of Material Sciences, University of Connecticut, 97 North Eagleville Road, Storrs, Connecticut 06269-3136, USA
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25
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Naskar B, Dan A, Ghosh S, Moulik SP. Characteristic physicochemical features of the biopolymer inulin in solvent added and depleted states. Carbohydr Polym 2010. [DOI: 10.1016/j.carbpol.2010.03.041] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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26
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Mahabir S, Wan W, Katsaras J, Nieh MP. Effects of Charge Density and Thermal History on the Morphologies of Spontaneously Formed Unilamellar Vesicles. J Phys Chem B 2010; 114:5729-35. [DOI: 10.1021/jp9106684] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Suanne Mahabir
- Biomedical Engineering Graduate Program, and Department of Chemical and Biochemical Engineering, The University of Western Ontario, London, Ontario, Canada, N6A 5B9, and National Research Council, Canadian Neutron Beam Centre, Steacie Institute for Molecular Science, Chalk River, Ontario, Canada
| | - Wankei Wan
- Biomedical Engineering Graduate Program, and Department of Chemical and Biochemical Engineering, The University of Western Ontario, London, Ontario, Canada, N6A 5B9, and National Research Council, Canadian Neutron Beam Centre, Steacie Institute for Molecular Science, Chalk River, Ontario, Canada
| | - John Katsaras
- Biomedical Engineering Graduate Program, and Department of Chemical and Biochemical Engineering, The University of Western Ontario, London, Ontario, Canada, N6A 5B9, and National Research Council, Canadian Neutron Beam Centre, Steacie Institute for Molecular Science, Chalk River, Ontario, Canada
| | - Mu-Ping Nieh
- Biomedical Engineering Graduate Program, and Department of Chemical and Biochemical Engineering, The University of Western Ontario, London, Ontario, Canada, N6A 5B9, and National Research Council, Canadian Neutron Beam Centre, Steacie Institute for Molecular Science, Chalk River, Ontario, Canada
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27
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Kučerka N, Nieh MP, Katsaras J. Small-Angle Scattering from Homogenous and Heterogeneous Lipid Bilayers. ADVANCES IN PLANAR LIPID BILAYERS AND LIPOSOMES 2010. [DOI: 10.1016/b978-0-12-381266-7.00008-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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28
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Genç R, Ortiz M, O'Sullivan CK. Curvature-tuned preparation of nanoliposomes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:12604-12613. [PMID: 19856992 DOI: 10.1021/la901789h] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Numerous methods have been reported for the preparation of liposomes, many of which, in addition to requiring time-consuming preparative steps and the use of organic solvents, result in heterogeneous liposome populations of incontrollable size. Taking into consideration the phenomenon of spontaneous vesiculation and the theory of curvature, here we present an extremely rapid and simple, solvent-free method for the preparation of monodisperse solutions of highly stable small unilamellar vesicles using both charged and zwitterionic lipids mixed with lyso-palmitoylphosphatidylcholine, exploiting a combination of a rapid pH change followed by a defined period of equilibration. Various experimental parameters and their interactions were evaluated in terms of their effect on resulting liposome size and shape, as well as on liposome stability and size distribution, with transmission electron microscope imaging being used to visualize the formed liposomes, and photon correlation spectroscopy to obtain statistical data on mean diameter and monodispersity of the liposome population. zeta potential measurements also provided information about the interpretation of vesiculation kinetics and liposome stability. The time interval of pH jump, operation temperature, equilibration time, and lipid type were shown to be the determining factors controlling the size, shape, and monodispersity of the liposomes. Buffer type was also found to be important for the long-term storage of the liposomes. Ongoing work is looking at the application of the developed method for encapsulation of bioactive molecules, such as drugs, genetic materials, and enzymes.
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Affiliation(s)
- Rükan Genç
- Nanobiotechnology and Bioanalysis Group, Department of Chemical Engineering, Universitat Rovira I Virgili, Av. Paisos Catalans, 26, 43007 Tarragona, Spain
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29
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Seantier B, Kasemo B. Influence of mono- and divalent ions on the formation of supported phospholipid bilayers via vesicle adsorption. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:5767-5772. [PMID: 19358596 DOI: 10.1021/la804172f] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We have used the quartz crystal microbalance with dissipation monitoring (QCM-D) technique to investigate how mono- and divalent cations influence the formation of supported (phospho)lipid bilayers (SPB, SLB), occurring via deposition of nanosized palmitoyloleoyl phosphatidylcholine (POPC) vesicles on a SiO2 support. This process is known to proceed via initial adsorption of intact vesicles until a critical surface coverage is reached, where the combination of vesicle-surface and vesicle-vesicle interaction causes the vesicles to rupture. New vesicles then rupture and the lipid fragments fuse until a final continuous bilayer is formed. We have explored how this process and the critical coverage are influenced by different mono- and divalent ions and ion concentrations, keeping the anions the same throughout the experiments. The same qualitative kinetics is observed for all cations. However, different ions cause quite different quantitative kinetics. When compared with monovalent ions, even very small added concentrations of divalent cations cause a strong reduction of the critical coverage, where conversion of intact, adsorbed vesicles to bilayer occurs. This bilayer promoting effect increases in the order Sr2+<Ca2+<Mg2+. Monovalent cations exhibit a much weaker but similar effect in the order Li+>Na+>K+. The results are of practical value for preparation of lipid bilayers and help shed light on the role of ions and on electrostatic effects at membrane surfaces/interfaces.
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Affiliation(s)
- Bastien Seantier
- Chalmers University of Technology, Chemical Physics Group, Applied Physics, Fysikgränd 3, Gothenburg, Sweden.
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30
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Vlachy N, Arteaga A, Klaus A, Touraud D, Drechsler M, Kunz W. Influence of additives and cation chain length on the kinetic stability of supersaturated catanionic systems. Colloids Surf A Physicochem Eng Asp 2009. [DOI: 10.1016/j.colsurfa.2008.05.044] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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31
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Puri A, Loomis K, Smith B, Lee JH, Yavlovich A, Heldman E, Blumenthal R. Lipid-based nanoparticles as pharmaceutical drug carriers: from concepts to clinic. Crit Rev Ther Drug Carrier Syst 2009; 26:523-80. [PMID: 20402623 PMCID: PMC2885142 DOI: 10.1615/critrevtherdrugcarriersyst.v26.i6.10] [Citation(s) in RCA: 553] [Impact Index Per Article: 36.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
In recent years, various nanotechnology platforms in the area of medical biology, including both diagnostics and therapy, have gained remarkable attention. Moreover, research and development of engineered multifunctional nanoparticles as pharmaceutical drug carriers have spurred exponential growth in applications to medicine in the last decade. Design principles of these nanoparticles, including nanoemulsions, dendrimers, nano-gold, liposomes, drug-carrier conjugates, antibody-drug complexes, and magnetic nanoparticles, are primarily based on unique assemblies of synthetic, natural, or biological components, including but not limited to synthetic polymers, metal ions, oils, and lipids as their building blocks. However, the potential success of these particles in the clinic relies on consideration of important parameters such as nanoparticle fabrication strategies, their physical properties, drug loading efficiencies, drug release potential, and, most importantly, minimum toxicity of the carrier itself. Among these, lipid-based nanoparticles bear the advantage of being the least toxic for in vivo applications, and significant progress has been made in the area of DNA/RNA and drug delivery using lipid-based nanoassemblies. In this review, we will primarily focus on the recent advances and updates on lipid-based nanoparticles for their projected applications in drug delivery. We begin with a review of current activities in the field of liposomes (the so-called honorary nanoparticles), and challenging issues of targeting and triggering will be discussed in detail. We will further describe nanoparticles derived from a novel class of amphipathic lipids called bolaamphiphiles with unique lipid assembly features that have been recently examined as drug/DNA delivery vehicles. Finally, an overview of an emerging novel class of particles (based on lipid components other than phospholipids), solid lipid nanoparticles and nanostructured lipid carriers will be presented. We conclude with a few examples of clinically successful formulations of currently available lipid-based nanoparticles.
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Affiliation(s)
- Anu Puri
- Center for Cancer Research Nanobiology Program, National Cancer Institute at Frederick, National Institutes of Health, Frederick, MD 21702-1201, USA.
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32
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33
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Tucker I, Penfold J, Thomas RK, Grillo I, Mildner DFR, Barker JG. Self-assembly in complex mixed surfactant solutions: the impact of dodecyl triethylene glycol on dihexadecyl dimethyl ammonium bromide. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:10089-10098. [PMID: 18702536 DOI: 10.1021/la8012359] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The impact of the nonionic surfactant, dodecyl triethyleneglycol ether (C(12)E(3)) on the solution microstructure of the dialkyl chain cationic surfactant, dihexadecyl dimethyl ammonium bromide, (DHDAB) has been investigated. The variation in solution microstructure has been studied using a combination of small angle neutron scattering, ultra small angle neutron scattering, optical texture and photon correlation spectroscopy. At low surfactant concentrations (1.5 mM) the microstructure takes the form of bilamellar vesicles (BLV) for compositions containing less than 20 mol % of added C(12)E(3). Multilamellar vesicles (MLV) are the predominant microstructure for solutions richer in composition than 20 mol % C(12)E(3). At more than 80 mol % C(12)E(3), the solution microstructure reverts to that of a lamellar phase dispersion consistent with studies on the pure nonionic surfactant. At higher concentrations (60 mM) a wide continuous L beta phase region is observed for compositions in the range 20 to 80 mol % C(12)E(3). The fine details of the phase diagram were obtained from quantitative analysis of the SANS data using a well-established lamellar membrane model. Irrespective of the nonionic content, the bilayers are in general highly rigid, consistent with those stabilized by charge interactions. Furthermore estimates of the product of membrane moduli (compressibility and bending modulus) indicate that the different phase regions have very different membrane properties, however the magnitude of the variations observed are not predicted using existing theoretical treatments.
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Affiliation(s)
- I Tucker
- Unilever Research and Development, Port Sunlight, Quarry Road East, Bebington, Wirral, U.K.
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34
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Song Y, Dorin RM, Garcia RM, Jiang YB, Wang H, Li P, Qiu Y, Swol FV, Miller JE, Shelnutt JA. Synthesis of Platinum Nanowheels Using a Bicellar Template. J Am Chem Soc 2008; 130:12602-3. [DOI: 10.1021/ja8047464] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yujiang Song
- Advanced Materials Laboratory, Sandia National Laboratories, Albuquerque, New Mexico 87106, Department of Chemical and Nuclear Engineering, University of New Mexico, Albuquerque, New Mexico 87131, and Department of Chemistry, University of Georgia, Athens, Georgia 30602
| | - Rachel M. Dorin
- Advanced Materials Laboratory, Sandia National Laboratories, Albuquerque, New Mexico 87106, Department of Chemical and Nuclear Engineering, University of New Mexico, Albuquerque, New Mexico 87131, and Department of Chemistry, University of Georgia, Athens, Georgia 30602
| | - Robert M. Garcia
- Advanced Materials Laboratory, Sandia National Laboratories, Albuquerque, New Mexico 87106, Department of Chemical and Nuclear Engineering, University of New Mexico, Albuquerque, New Mexico 87131, and Department of Chemistry, University of Georgia, Athens, Georgia 30602
| | - Ying-Bing Jiang
- Advanced Materials Laboratory, Sandia National Laboratories, Albuquerque, New Mexico 87106, Department of Chemical and Nuclear Engineering, University of New Mexico, Albuquerque, New Mexico 87131, and Department of Chemistry, University of Georgia, Athens, Georgia 30602
| | - Haorong Wang
- Advanced Materials Laboratory, Sandia National Laboratories, Albuquerque, New Mexico 87106, Department of Chemical and Nuclear Engineering, University of New Mexico, Albuquerque, New Mexico 87131, and Department of Chemistry, University of Georgia, Athens, Georgia 30602
| | - Peng Li
- Advanced Materials Laboratory, Sandia National Laboratories, Albuquerque, New Mexico 87106, Department of Chemical and Nuclear Engineering, University of New Mexico, Albuquerque, New Mexico 87131, and Department of Chemistry, University of Georgia, Athens, Georgia 30602
| | - Yan Qiu
- Advanced Materials Laboratory, Sandia National Laboratories, Albuquerque, New Mexico 87106, Department of Chemical and Nuclear Engineering, University of New Mexico, Albuquerque, New Mexico 87131, and Department of Chemistry, University of Georgia, Athens, Georgia 30602
| | - Frank van Swol
- Advanced Materials Laboratory, Sandia National Laboratories, Albuquerque, New Mexico 87106, Department of Chemical and Nuclear Engineering, University of New Mexico, Albuquerque, New Mexico 87131, and Department of Chemistry, University of Georgia, Athens, Georgia 30602
| | - James E. Miller
- Advanced Materials Laboratory, Sandia National Laboratories, Albuquerque, New Mexico 87106, Department of Chemical and Nuclear Engineering, University of New Mexico, Albuquerque, New Mexico 87131, and Department of Chemistry, University of Georgia, Athens, Georgia 30602
| | - John A. Shelnutt
- Advanced Materials Laboratory, Sandia National Laboratories, Albuquerque, New Mexico 87106, Department of Chemical and Nuclear Engineering, University of New Mexico, Albuquerque, New Mexico 87131, and Department of Chemistry, University of Georgia, Athens, Georgia 30602
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Khatua D, Ghosh S, Dey J, Ghosh G, Aswal VK. Physicochemical Properties and Microstructure Formation of the Surfactant Mixtures of Sodium N-(2-(n-Dodecylamino)ethanoyl)-l-alaninate and SDS in Aqueous Solutions. J Phys Chem B 2008; 112:5374-80. [DOI: 10.1021/jp7096636] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Dibyendu Khatua
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, India, and UGC-DAE Consortium for Scientific Research and Solid State Physics Division, BARC, Trombay, Mumbai 400 085, India
| | - Sampad Ghosh
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, India, and UGC-DAE Consortium for Scientific Research and Solid State Physics Division, BARC, Trombay, Mumbai 400 085, India
| | - Joykrishna Dey
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, India, and UGC-DAE Consortium for Scientific Research and Solid State Physics Division, BARC, Trombay, Mumbai 400 085, India
| | - Goutam Ghosh
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, India, and UGC-DAE Consortium for Scientific Research and Solid State Physics Division, BARC, Trombay, Mumbai 400 085, India
| | - V. K. Aswal
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, India, and UGC-DAE Consortium for Scientific Research and Solid State Physics Division, BARC, Trombay, Mumbai 400 085, India
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Nieh MP, Katsaras J, Qi X. Controlled release mechanisms of spontaneously forming unilamellar vesicles. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2008; 1778:1467-71. [PMID: 18394425 DOI: 10.1016/j.bbamem.2008.02.016] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2007] [Revised: 02/26/2008] [Accepted: 02/26/2008] [Indexed: 11/17/2022]
Abstract
Spontaneously forming small unilamellar vesicles (SULVs) are easy to prepare and show great promise for use in delivering therapeutic payloads. We report of SULVs made up of the ternary phospholipid mixture, dimyristoyl-phosphatidylcholine (DMPC), dihexanoyl-phosphatidylcholine (DHPC) and dimyristoyl-phosphatidylglycerol (DMPG), which have been characterized by small angle neutron scattering (SANS). These low-polydispersity (0.14-0.19) SULVs range in size (i.e., radius) from 110 to 215 A and are capable of entrapping, and subsequently releasing, hydrophilic molecules (e.g., fluorescent dyes and quenchers) in a controlled fashion over two different temperature ranges. The low-temperature release mechanism involves the SULVs transforming into discoidal micelles, with an onset temperature (T(o)) of ~32 degrees C, while the high-temperature release mechanism is more gradual, presumably the result of defects formed through the continuous dissolution of DHPC into solution. Both of these mechanisms differ from other, previously reported thermosensitive liposomes.
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Affiliation(s)
- Mu-Ping Nieh
- Canadian Neutron Beam Centre, Steacie Institute for Molecular Sciences, National Research Council Canada, Chalk River Laboratory, Chalk River, ON, Canada.
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Duerr-Auster N, Kohlbrecher J, Zuercher T, Gunde R, Fischer P, Windhab E. Microstructure and stability of a lamellar liquid crystalline and gel phase formed by a polyglycerol ester mixture in dilute aqueous solution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:12827-12834. [PMID: 18031069 DOI: 10.1021/la702242v] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The self-assembly behavior of a commercial mixture of polyglycerol fatty acid esters (PGE) and water is investigated as a function of temperature and surfactant content. The phase diagram of this pseudo-binary mixture was characterized using a combination of cross-polarized light and freeze-fracture electron microscopy (cryo-SEM), X-ray diffraction (XRD), small-angle neutron scattering (SANS), and differential scanning calorimetry (DSC). Our experiments show that the morphology of the supramolecular aggregates is lamellar and present in the form of a continuous or dispersed phase (multilamellar vesicles) depending on the water content of the system. Under the effect of temperature, the short- and long-range order of the bimolecular layers successively changes from a biphasic surfactant dispersion to a lamellar liquid-crystalline (Lalpha) and a stable lamellar gel phase (Lbeta) upon cooling; this transition is found to be irreversible. Formation of the lamellar aggregates can be related to the average molecular structure and shape factor of PGE. The stability of the resulting gel phase (Lbeta) appears to be due to the presence of small amounts of unreacted ionic co-surfactant, namely, fatty acid soaps, in this per se nonionic commercial mixture.
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Affiliation(s)
- N Duerr-Auster
- Institute of Food Science and Nutrition, ETH Zurich, 8092 Zurich, Switzerland.
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38
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Sohrabi B, Gharibi H, Javadian S, Hashemianzadeh M. A New Model to Study the Phase Transition from Microstructures to Nanostructures in Ionic/Ionic Surfactants Mixture. J Phys Chem B 2007; 111:10069-78. [PMID: 17685568 DOI: 10.1021/jp073284j] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The phase behavior and aggregate structures of mixtures of the oppositely charged surfactants cetyltrimethyl ammonium bromide (CTAB) and sodium dodecyl sulfate (SDS) are explored at high dilution by pulsed field gradient stimulated echo (PFG-STE) NMR. The aggregation numbers and hydrodynamic radii of vesicles and mixed micelles were determined by a combination of viscosity and self-diffusion coefficient measurements. The average size of the mixed micelles was larger than that of micelles containing uniformly charged head groups. Analysis of the variations of the self-diffusion coefficient and viscosity with changing concentration of CTAB or SDS in the cationic-rich and anionic-rich regions revealed a phase transition from vesicles to mixed micelles. Differences in the lengths of the CTAB and SDS hydrophobic chains stabilize vesicles relative to other microstructures (e.g., liquid crystalline and precipitate phase), and vesicles form spontaneously over a wide range of compositions in both cationic-rich and anionic-rich solutions. The results obtained from conductometry measurements confirmed this transition. Finally, according to the capacitor model, a new model was developed for estimating the surface potentials and electrostatic free energy (g(elec)). Then we investigated the variations of electrostatic and transfer free energy in phase transition between mixed micelle and vesicle.
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Affiliation(s)
- Beheshteh Sohrabi
- Department of Chemistry, Tarbiat Modarres University, P.O. Box 14155-4838, Tehran, Iran
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39
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Cinelli S, Onori G, Zuzzi S, Bordi F, Cametti C, Sennato S, Diociaiuti M. Properties of Mixed DOTAP−DPPC Bilayer Membranes as Reported by Differential Scanning Calorimetry and Dynamic Light Scattering Measurements. J Phys Chem B 2007; 111:10032-9. [PMID: 17663578 DOI: 10.1021/jp071722g] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We have investigated the effect of a cationic lipid [DOTAP] on both the thermotropic phase behavior and the structural organization of aqueous dispersions of dipalmitoyl-phosphatidylcholine [DPPC] by means of high-sensitivity differential scanning calorimetry and dynamic light scattering measurements. We find that the incorporation of increasing quantities of DOTAP progressively reduces the temperature and the enthalpy of the gel-to-liquid crystalline transition. We are further showing that, in mixed DOTAP-DPPC systems, the reduction of the phase transition temperature is accompanied by a reduction of the average size of the structures present in the aqueous mixtures, whatever the DOTAP concentration is. These results, which extend a previous investigation by Campbell et al. (Campbell, R. B.; Balasubramanian, S. V.; Straubinger, R. M.; Biochim. Biosphys. Acta 2001, 27, 1512.) limited to a DOTAP concentration below 20 mol %, confirm that the insertion of cationic head groups in zwitterionic phosphatidylcholine bilayers facilitates the formation of stable, relatively small, unilamellar vesicles. This self-assembling restructuring from an aqueous multilamellar structure toward a liposomal phase is favored by decreasing the phospholipid phase transition temperature and by increasing the temperature of the system. This reduction of the average size and the appearance of a stable liposomal phase is also promoted by a heating and cooling thermal treatment.
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Affiliation(s)
- S Cinelli
- Dipartimento di Fisica, UniversitA di Perugia and CEMIN (Centro Eccellenza Materiali Innovativi Nanostrutturati) Via A. Pascoli, I-06123, Perugia, Italy
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40
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Nieh MP, Raghunathan VA, Kline SR, Harroun TA, Huang CY, Pencer J, Katsaras J. Spontaneously formed unilamellar vesicles with path-dependent size distribution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:6656-61. [PMID: 16008370 DOI: 10.1021/la0508994] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
We observe the spontaneous formation of path-dependent monodisperse and polydisperse phospholipid unilamellar vesicles (ULV) from two different equilibrium morphologies specifically, disklike micelles and extended lamellae, respectively. On heating beyond a temperature Tc, low temperature disklike micelles, or so-called bicelles, transform into lamellae. Dilution of the lamellar phase, at a fixed temperature, results in a complete unbinding transition and the formation of polydisperse ULV, demonstrating the instability of the lamellar phase. On the other hand, heating of a dilute bicellar phase above Tc results in monodisperse ULV, which on cooling revert back to bicelles for lipid concentrations phi > or = 0.5 wt % and transform into oblate ellipsoids for phi = 0.1 wt %, a morphology not previously seen in "bicellar" lipid mixtures. Monodisperse ULV reform on heating of the oblate ellipsoids.
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Affiliation(s)
- Mu-Ping Nieh
- National Research Council, Steacie Institute for Molecular Sciences, Chalk River, Ontario, K0J 1J0, Canada
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Katsaras J, Harroun TA, Pencer J, Nieh MP. “Bicellar” Lipid Mixtures as used in Biochemical and Biophysical Studies. Naturwissenschaften 2005; 92:355-66. [PMID: 16021408 DOI: 10.1007/s00114-005-0641-1] [Citation(s) in RCA: 89] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Over the past decade "bicellar" lipid mixtures composed of the long-chain dimyristoyl phosphatidylcholine (DMPC) and the short-chain dihexanoyl PC (DHPC) molecules have emerged as a powerful medium for studying membrane associated, biologically relevant macromolecules and assemblies. Depending on temperature, lipid concentration and composition these lipid mixtures can assume a variety of morphologies, some of them alignable in the presence of a magnetic field. This article will examine the biophysical studies that have elucidated the various morphologies assumed by these lipid mixtures, and their use in the biochemical studies of biomolecules.
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Affiliation(s)
- John Katsaras
- National Research Council, Chalk River Laboratories, Chalk River, Ontario, Canada.
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Yue B, Huang CY, Nieh MP, Glinka CJ, Katsaras J. Highly Stable Phospholipid Unilamellar Vesicles from Spontaneous Vesiculation: A DLS and SANS Study. J Phys Chem B 2004; 109:609-16. [PMID: 16851053 DOI: 10.1021/jp047510q] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Spontaneously formed unilamellar vesicles (ULV) composed of short- and long-chain phospholipids, dihexanoyl phosphorylcholine (DHPC) and dimyristoyl phosphorylcholine (DMPC), respectively, were doped with a negatively charged lipid, dimyristoyl phosphorylglycerol (DMPG), and studied with small-angle neutron scattering (SANS) and dynamic light scattering (DLS). Upon dilution, the spontaneous formation of vesicles was found to take place from bilayered micelles, or so-called "bicelles". SANS and DLS data show that ULV with narrow size distributions are highly stable at low lipid (C(lp) < 0.50 wt %) and NaCl salt (C(s)) concentrations. ULV size was found to be independent of both C(lp) and C(s) when they were below 0.33 and 0.5 wt %, respectively. Surface charge and salinity were found to be important factors in preparing ULV of a certain size. This observation is not in complete agreement with previous experimental results and cannot be completely explained with current theoretical predictions based on equilibrium calculations for catanionic surfactant mixtures. ULV size is found to be invariant over a wide range of temperatures, both below and above the phase-transition temperature, T(M), of DMPC, and was stable for periods of weeks and months, even after sonication.
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Affiliation(s)
- Baohua Yue
- Otto H. York Department of Chemical Engineering, New Jersey Institute of Technology, Newark, New Jersey 07102, USA
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