1
|
Read H, Benaglia S, Fumagalli L. Structure and thermodynamics of supported lipid membranes on hydrophobic van der Waals surfaces. SOFT MATTER 2024; 20:5724-5732. [PMID: 38979701 PMCID: PMC11268427 DOI: 10.1039/d4sm00365a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2024] [Accepted: 06/19/2024] [Indexed: 07/10/2024]
Abstract
Understanding the adsorption and physical characteristics of supported lipid membranes is crucial for their effective use as model cell membranes. Their morphological and thermodynamic properties at the nanoscale have traditionally been studied on hydrophilic substrates, such as mica and silicon oxide, which have proved to facilitate the reconstruction of biomembranes. However, in more recent years, with the advent of the van der Waals crystals technology, two-dimensional crystals such as graphene have been proposed as potential substrates in biosensing devices. Membranes formed on these crystals are expected to behave differently owing to their intrinsic hydrophobicity, however thus far knowledge of their morphological and thermodynamic properties is lacking. Here we present a comprehensive nanoscale analysis of the adsorption of phosphatidylcholine lipid monolayers on two of the most commonly used van der Waals crystals, graphite and hexagonal boron nitride. Both morphological and thermodynamic properties of the lipid membranes were investigated using temperature-controlled atomic force microscopy. Our experiments show that the lipids adsorb onto the crystals, forming monolayers with their orientation dependent upon their concentration. Furthermore, we found that the hydrophobicity of van der Waals crystals determines a strong increase in the transition temperature of the lipid monolayer compared to that observed on hydrophilic substrates. These results are important for understanding the properties of lipid membranes at solid surfaces and extending their use to novel drug delivery and biosensing devices made of van der Waals crystals.
Collapse
Affiliation(s)
- Harriet Read
- Department of Physics & Astronomy University of Manchester, Manchester, M13 9PL, UK.
- National Graphene Institute, University of Manchester, Manchester, M13 9PL, UK
| | - Simone Benaglia
- Department of Physics & Astronomy University of Manchester, Manchester, M13 9PL, UK.
- National Graphene Institute, University of Manchester, Manchester, M13 9PL, UK
| | - Laura Fumagalli
- Department of Physics & Astronomy University of Manchester, Manchester, M13 9PL, UK.
- National Graphene Institute, University of Manchester, Manchester, M13 9PL, UK
| |
Collapse
|
2
|
Budai L, Budai M, Bozó T, Agócs G, Kellermayer M, Antal I. Determination of the Main Phase Transition Temperature of Phospholipids by Oscillatory Rheology. Molecules 2023; 28:5125. [PMID: 37446784 DOI: 10.3390/molecules28135125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Revised: 06/22/2023] [Accepted: 06/27/2023] [Indexed: 07/15/2023] Open
Abstract
Knowledge of the physical and chemical properties of phospholipids, such as phase transition temperatures (Tc), is of great importance in order to reveal the functionalities of biological and artificial membranes. Our research group developed an oscillatory rheological method for the simple and rapid determination of phase transition temperatures (Tc). The phospholipids constructing the membranes undergo conformational changes at their Tc, which cause alterations of viscoelastic properties of the molecules. The oscillatory technique recommended by us proved to be appropriate to reveal the altered molecular properties of phospholipids as tracking the slightest changes in the viscoelasticity. Our study demonstrates the abrupt changes in rheological properties at Tc for the following phospholipids: 1,2-Dimyristoyl-sn-glycero-3-Phosphocholine (DMPC), 1,2-Dipalmitoyl-sn-glycero-3-Phosphatidylcholine (DPPC), and 1,2-Distearoyl-sn-glycero-3-Phosphocholine (DSPC), proving that the applied methodology is adequate for determining the Tc of phospholipids.
Collapse
Affiliation(s)
- Lívia Budai
- Department of Pharmaceutics, Semmelweis University, Hőgyes Str. 7, 1092 Budapest, Hungary
| | - Marianna Budai
- Department of Pharmaceutics, Semmelweis University, Hőgyes Str. 7, 1092 Budapest, Hungary
| | - Tamás Bozó
- Department of Biophysics and Radiation Biology, Semmelweis University, Tűzoltó Str. 37-7, 1094 Budapest, Hungary
| | - Gergely Agócs
- Department of Biophysics and Radiation Biology, Semmelweis University, Tűzoltó Str. 37-7, 1094 Budapest, Hungary
| | - Miklós Kellermayer
- Department of Biophysics and Radiation Biology, Semmelweis University, Tűzoltó Str. 37-7, 1094 Budapest, Hungary
| | - István Antal
- Department of Pharmaceutics, Semmelweis University, Hőgyes Str. 7, 1092 Budapest, Hungary
| |
Collapse
|
3
|
Recent advances in superlubricity of liposomes for biomedical applications. Colloids Surf B Biointerfaces 2022; 218:112764. [PMID: 35973238 DOI: 10.1016/j.colsurfb.2022.112764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2022] [Revised: 07/18/2022] [Accepted: 08/07/2022] [Indexed: 11/23/2022]
Abstract
Achieving superlubricity, a state of lubrication where friction nearly vanishes, has become one of the most promising approaches to combat friction-induced energy dissipation and medical device failure. Phospholipids are amphiphilic molecules comprising highly hydrophilic phosphatidylcholine head groups as well as hydrophobic hydrocarbon chains, When solubilized, phospholipids can readily self-assemble to form different structures such as bilayers and vesicles (liposomes). Recently, liposomes have been identified as excellent lubricants, especially in the boundary lubrication regime the most common lubrication status in the field of biotribology. In this review, we summarize recent progress in employing liposomes as key players for employing superlubricity in biomedical applications. The relationship between lipids and liposomes, manufacturing approaches, lubrication regimes, and regulation mechanisms of liposomes are discussed. Finally, we indicate possible future directions for the use of liposome-mediated superlubricity in biomedical applications.
Collapse
|
4
|
Cohen ZR, Kessenich BL, Hazra A, Nguyen J, Johnson RS, MacCoss MJ, Lalic G, Black RA, Keller SL. Prebiotic Membranes and Micelles Do Not Inhibit Peptide Formation During Dehydration. Chembiochem 2022; 23:e202100614. [PMID: 34881485 PMCID: PMC8957845 DOI: 10.1002/cbic.202100614] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Revised: 12/07/2021] [Indexed: 02/06/2023]
Abstract
Cycles of dehydration and rehydration could have enabled formation of peptides and RNA in otherwise unfavorable conditions on the early Earth. Development of the first protocells would have hinged upon colocalization of these biopolymers with fatty acid membranes. Using atomic force microscopy, we find that a prebiotic fatty acid (decanoic acid) forms stacks of membranes after dehydration. Using LC-MS-MS (liquid chromatography-tandem mass spectrometry) with isotope internal standards, we measure the rate of formation of serine dipeptides. We find that dipeptides form during dehydration at moderate temperatures (55 °C) at least as fast in the presence of decanoic acid membranes as in the absence of membranes. Our results are consistent with the hypothesis that protocells could have formed within evaporating environments on the early Earth.
Collapse
Affiliation(s)
- Zachary R. Cohen
- Department of Chemistry, University of Washington – Seattle, Seattle, Washington 98195-1700, USA, Astrobiology Program, University of Washington – Seattle, Seattle, Washington 98195, USA
| | - Brennan L. Kessenich
- Department of Chemistry, University of Washington – Seattle, Seattle, Washington 98195-1700, USA
| | - Avijit Hazra
- Department of Chemistry, University of Washington – Seattle, Seattle, Washington 98195-1700, USA
| | - Julia Nguyen
- Department of Chemistry, University of Washington – Seattle, Seattle, Washington 98195-1700, USA
| | - Richard S. Johnson
- Department of Genome Sciences, University of Washington – Seattle, Seattle, Washington 98195, USA
| | - Michael J. MacCoss
- Department of Genome Sciences, University of Washington – Seattle, Seattle, Washington 98195, USA
| | - Gojko Lalic
- Department of Chemistry, University of Washington – Seattle, Seattle, Washington 98195-1700, USA
| | - Roy. A. Black
- Department of Chemistry, University of Washington – Seattle, Seattle, Washington 98195-1700, USA
| | - Sarah L. Keller
- Department of Chemistry, University of Washington – Seattle, Seattle, Washington 98195-1700, USA, Astrobiology Program, University of Washington – Seattle, Seattle, Washington 98195, USA
| |
Collapse
|
5
|
Kiss B, Bozó T, Mudra D, Tordai H, Herényi L, Kellermayer M. Development, structure and mechanics of a synthetic E. coli outer membrane model. NANOSCALE ADVANCES 2021; 3:755-766. [PMID: 36133844 PMCID: PMC9418885 DOI: 10.1039/d0na00977f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Accepted: 12/09/2020] [Indexed: 06/16/2023]
Abstract
The outer membrane (OM) of Gram-negative bacteria is a complex asymmetric bilayer containing lipids, lipopolysaccharides (LPS) and proteins. While it is a mechanical and chemical barrier, it is also the primary surface of bacterial recognition processes that involve infection by and of the bacterium. Uncovering the mechanisms of these biological functions has been hampered by the lack of suitable model systems. Here we report the step-by-step assembly of a synthetic OM model from its fundamental components. To enable the efficient formation of a supported lipid bilayer at room temperature, dimyristoyl-phosphocholine (DMPC) was used as the lipid component to which we progressively added LPS and OM proteins. The assembled system enabled us to explore the contribution of the molecular components to the topographical structure and stability of the OM. We found that LPS prefers solid-state membrane regions and forms stable vesicles in the presence of divalent cations. LPS can gradually separate from DMPC membranes to form independent vesicles, pointing at the dynamic nature of the lipid-LPS system. The addition of OM proteins from E. coli and saturating levels of LPS to DMPC liposomes resulted in a thicker and more stable bilayer the surface of which displayed a nanoscale texture formed of parallel, curved, long (>500 nm) stripes spaced apart with a 15 nm periodicity. The synthetic membrane may facilitate the investigation of binding and recognition processes on the surface of Gram-negative bacteria.
Collapse
Affiliation(s)
- Bálint Kiss
- Department of Biophysics and Radiation Biology, Semmelweis University Budapest Hungary
| | - Tamás Bozó
- Department of Biophysics and Radiation Biology, Semmelweis University Budapest Hungary
| | - Dorottya Mudra
- Department of Biophysics and Radiation Biology, Semmelweis University Budapest Hungary
| | - Hedvig Tordai
- Department of Biophysics and Radiation Biology, Semmelweis University Budapest Hungary
| | - Levente Herényi
- Department of Biophysics and Radiation Biology, Semmelweis University Budapest Hungary
| | - Miklós Kellermayer
- Department of Biophysics and Radiation Biology, Semmelweis University Budapest Hungary
| |
Collapse
|
6
|
Ha Y, Koo Y, Park SK, Kim GE, Oh HB, Kim HR, Kwon JH. Liposome leakage and increased cellular permeability induced by guanidine-based oligomers: effects of liposome composition on liposome leakage and human lung epithelial barrier permeability. RSC Adv 2021; 11:32000-32011. [PMID: 35495488 PMCID: PMC9042049 DOI: 10.1039/d1ra05478c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Accepted: 09/17/2021] [Indexed: 11/21/2022] Open
Abstract
In this study, liposome leakage using different liposome compositions and increased cellular permeability of human lung monolayer models induced by PHMG and PHMB were investigated.
Collapse
Affiliation(s)
- Yeonjeong Ha
- Division of Environmental Science and Ecological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Yerim Koo
- Division of Environmental Science and Ecological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Seon-Kyung Park
- Division of Environmental Science and Ecological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Ga-Eun Kim
- College of Pharmacy, Daegu Catholic University, 13-13 Hayang-ro, Hayang-eup, Gyeongsan 38430, Republic of Korea
| | - Han Bin Oh
- Department of Chemistry, Sogang University, 35 Baekbeom-ro, Mapo-gu, Seoul 04107, Republic of Korea
| | - Ha Ryong Kim
- College of Pharmacy, Daegu Catholic University, 13-13 Hayang-ro, Hayang-eup, Gyeongsan 38430, Republic of Korea
| | - Jung-Hwan Kwon
- Division of Environmental Science and Ecological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| |
Collapse
|
7
|
Vega M, Lurio L, Lal J, Karapetrova EA, Gaillard ER. Structure of supported DPPC/cholesterol bilayers studied via X-ray reflectivity. Phys Chem Chem Phys 2020; 22:19089-19099. [PMID: 32807995 DOI: 10.1039/d0cp01834a] [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
The electron density profile of bilayers of DPPC/cholesterol mixtures supported on semiconductor grade silicon substrates were studied with the objective of determining how the proximity of a solid interface modifies the phase diagram of mixed bilayers. The bilayers were studied in situ immersed in water via synchrotron X-ray reflectivity (XRR). Measurements were performed as a function of temperature through the main phase transition and cholesterol mole fractions up to 40%. Analysis of XRR yields the bilayer thickness, roughness and leaflet asymmetry. We find that the structure of the pure DPPC bilayers in the gel phase is in agreement with previous X-ray measurements of supported bilayers deposited via vesicle fusion and multilamellar vesicles but show more clearly defined features than measurements made on films formed using Langmuir-Blodget Langmuir-Shaffer (LB) deposition. Examination of bilayer thickness vs. temperature shows that the melting temperature for supported bilayers is shifted upwards by approximately 4 °C relative to multilamellar vesicles and that the melting temperature decreases with increasing cholesterol content up to 20%. For pure DPPC bilayers the leaflets melt in two stages with the distal leaflet melting first. For cholesterol concentrations of 10% and 20% there is no clear indication of separate melting. For 33% and 40% cholesterol content no clear transition is seen in the bilayer thickness, but an abrupt change in roughness indicates possible microdomain formation in the 40% cholesterol sample.
Collapse
Affiliation(s)
- Michael Vega
- Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, IL 60115, USA.
| | | | | | | | | |
Collapse
|
8
|
Ha Y, Kwon JH. Effects of lipid membrane composition on the distribution of biocidal guanidine oligomer with solid supported lipid membranes. RSC Adv 2020; 10:22343-22351. [PMID: 35514581 PMCID: PMC9054620 DOI: 10.1039/d0ra03108a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Accepted: 06/04/2020] [Indexed: 11/21/2022] Open
Abstract
Polyhexamethylene guanidine (PHMG) is a cationic antimicrobial oligomer that has been used prevalently over the past few decades. However, due to the lack of inhalation toxicity assessment of PHMG, it has caused severe health damage, including fatal lung fibrosis, after being used as one of the major active ingredients of humidifier disinfectants in Korea. Because the first step of the entry of PHMG into airway is its association with cell membranes, the distribution of PHMG between lipid membranes and water is very important to know the depositional flux in the respiratory systems and related toxic mechanisms. We developed a quantitative method to determine the distribution constant (Klipw) of PHMG between solid supported lipid membranes and water and evaluated the effects of lipid membrane compositions on the Klipw of PHMG. PHMG accumulated into anionic lipid membranes rapidly compared to into cationic or zwitterionic lipid membranes, suggesting fast adsorption of PHMG onto anionic lipid head groups. Klipw values with anionic/zwitterionic lipid mixtures were higher than Klipw values with anionic lipids only, potentially due to the later phase separation after preferential interaction between PHMG and anionic lipids in lipid mixtures. In addition, Klipw values increased with increasing single acyl chain lipid content in unsaturated lipids and decreasing cholesterol content. These results imply that changes in lipid spontaneous curvature and lipid bilayer packing density also affect the membrane distribution of PHMG. This study experimentally determined the Klipw of PHMG and assessed the effects of lipid membrane composition on Klipw values.![]()
Collapse
Affiliation(s)
- Yeonjeong Ha
- Division of Environmental Science and Ecological Engineering, Korea University 145 Anam-ro Seongbuk-gu Seoul 02841 Republic of Korea +82 2 3290 3041
| | - Jung-Hwan Kwon
- Division of Environmental Science and Ecological Engineering, Korea University 145 Anam-ro Seongbuk-gu Seoul 02841 Republic of Korea +82 2 3290 3041
| |
Collapse
|
9
|
Richard-Lacroix M, Umuhire KN, Lister E, Pellerin C, Badia A. Selective Isotopic Labeling Resolves the Gel-to-Fluid Phase Transitions of the Individual Leaflets of a Planar-Supported Phospholipid Bilayer. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:9912-9922. [PMID: 31277548 DOI: 10.1021/acs.langmuir.9b00747] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Knowledge of the thermotropic phase behavior of solid-supported bilayer lipid assemblies is essential to mimick the molecular organization and lateral fluidity of cell membranes. The gel-to-fluid phase transitions in a homologous series of single phospholipid bilayers supported on planar silicon substrates were investigated by temperature-controlled atomic force microscopy and attenuated total reflection infrared spectroscopy to obtain complementary information at the mesoscopic and molecular scales. Symmetric bilayers of dipalmitoylphosphatidylcholine (DPPC) and vertically asymmetric bilayers composed of a leaflet of DPPC and another of acyl-chain-deuterated DPPC (DPPC-d62) were prepared by the Langmuir-Blodgett technique. The selective deuteration of one of the bilayer leaflets enabled the simultaneous monitoring by IR spectroscopy of the acyl chain melting in each leaflet via the spectrally isolated CH2 and CD2 stretching vibrations. Two gel-to-fluid transitions were discerned for both the symmetric and asymmetric bilayers in ultrapure water. The deuterium isotope effect observed in free-standing membranes was maintained for the supported bilayers. IR spectroscopy revealed that the melting of one leaflet promotes the disordering of the acyl chains in the adjacent one. The findings suggest that the two leaflet phase transitions do not evolve in isolation. This work sheds insight into the nature of leaflet-leaflet interactions and the thermodynamic properties of surface-confined phospholipid bilayers.
Collapse
Affiliation(s)
- Marie Richard-Lacroix
- Département de chimie, Centre québécois sur les matériaux fonctionnels , Université de Montréal , C.P. 6128, succursale Centre-ville , Montréal , QC H3C 3J7 , Canada
| | - Kayiganwa Natyvella Umuhire
- Département de chimie, Centre québécois sur les matériaux fonctionnels , Université de Montréal , C.P. 6128, succursale Centre-ville , Montréal , QC H3C 3J7 , Canada
| | - Eugénie Lister
- Département de chimie, Centre québécois sur les matériaux fonctionnels , Université de Montréal , C.P. 6128, succursale Centre-ville , Montréal , QC H3C 3J7 , Canada
| | - Christian Pellerin
- Département de chimie, Centre québécois sur les matériaux fonctionnels , Université de Montréal , C.P. 6128, succursale Centre-ville , Montréal , QC H3C 3J7 , Canada
| | - Antonella Badia
- Département de chimie, Centre québécois sur les matériaux fonctionnels , Université de Montréal , C.P. 6128, succursale Centre-ville , Montréal , QC H3C 3J7 , Canada
| |
Collapse
|
10
|
Plaut JS, Strzelecka-Kiliszek A, Bozycki L, Pikula S, Buchet R, Mebarek S, Chadli M, Bolean M, Simao AMS, Ciancaglini P, Magrini A, Rosato N, Magne D, Girard-Egrot A, Farquharson C, Esener SC, Millan JL, Bottini M. Quantitative atomic force microscopy provides new insight into matrix vesicle mineralization. Arch Biochem Biophys 2019; 667:14-21. [PMID: 30998909 DOI: 10.1016/j.abb.2019.04.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2018] [Revised: 04/11/2019] [Accepted: 04/13/2019] [Indexed: 12/22/2022]
Abstract
Matrix vesicles (MVs) are a class of extracellular vesicles that initiate mineralization in cartilage, bone, and other vertebrate tissues by accumulating calcium ions (Ca2+) and inorganic phosphate (Pi) within their lumen and forming a nucleation core (NC). After further sequestration of Ca2+ and Pi, the NC transforms into crystalline complexes. Direct evidence of the existence of the NC and its maturation have been provided solely by analyses of dried samples. We isolated MVs from chicken embryo cartilage and used atomic force microscopy peak force quantitative nanomechanical property mapping (AFM-PFQNM) to measure the nanomechanical and morphological properties of individual MVs under both mineralizing (+Ca2+) and non-mineralizing (-Ca2+) fluid conditions. The elastic modulus of MVs significantly increased by 4-fold after incubation in mineralization buffer. From AFM mapping data, we inferred the morphological changes of MVs as mineralization progresses: prior to mineralization, a punctate feature, the NC, is present within MVs and this feature grows and stiffens during mineralization until it occupies most of the MV lumen. Dynamic light scattering showed a significant increase in hydrodynamic diameter and no change in the zeta potential of hydrated MVs after incubation with Ca2+. This validates that crystalline complexes, which are strongly negative relative to MVs, were forming within the lumen of MVs. These data were substantiated by transmission electron microscopy energy dispersive X-ray and Fourier transform infrared spectroscopic analyses of dried MVs, which provide evidence that the complexes increased in size, crystallinity, and Ca/P ratio within MVs during the mineralization process.
Collapse
Affiliation(s)
- Justin S Plaut
- Cancer Early Detection Advanced Research Center, Knight Cancer Institute, Oregon Health & Science University, Portland, OR, 97201, USA; Department of Bioengineering, University of California San Diego, La Jolla, CA, 92093, USA
| | - Agnieszka Strzelecka-Kiliszek
- Laboratory of Biochemistry of Lipids, Nencki Institute of Experimental Biology, Polish Academy of Sciences, 02-093, Warsaw, Poland
| | - Lukasz Bozycki
- Laboratory of Biochemistry of Lipids, Nencki Institute of Experimental Biology, Polish Academy of Sciences, 02-093, Warsaw, Poland
| | - Slawomir Pikula
- Laboratory of Biochemistry of Lipids, Nencki Institute of Experimental Biology, Polish Academy of Sciences, 02-093, Warsaw, Poland
| | - René Buchet
- Université de Lyon, Université Lyon 1, Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, UMR CNRS 5246, 69 622, Villeurbanne Cedex, France
| | - Saida Mebarek
- Université de Lyon, Université Lyon 1, Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, UMR CNRS 5246, 69 622, Villeurbanne Cedex, France
| | - Meriem Chadli
- Université de Lyon, Université Lyon 1, Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, UMR CNRS 5246, 69 622, Villeurbanne Cedex, France
| | - Maytê Bolean
- Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto - USP, Departamento de Química, 14040-901, Ribeirão Preto, Brazil
| | - Ana M S Simao
- Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto - USP, Departamento de Química, 14040-901, Ribeirão Preto, Brazil
| | - Pietro Ciancaglini
- Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto - USP, Departamento de Química, 14040-901, Ribeirão Preto, Brazil
| | - Andrea Magrini
- Department of Biopathology and Imaging Diagnostics, University of Rome Tor Vergata, Rome, Italy; Nanoscience & Nanotechnology & Innovative Instrumentation (NAST) Centre, University of Rome Tor Vergata, Rome, Italy
| | - Nicola Rosato
- Nanoscience & Nanotechnology & Innovative Instrumentation (NAST) Centre, University of Rome Tor Vergata, Rome, Italy; Department of Experimental Medicine, University of Rome Tor Vergata, Rome, Italy
| | - David Magne
- Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto - USP, Departamento de Química, 14040-901, Ribeirão Preto, Brazil
| | - Agnès Girard-Egrot
- Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto - USP, Departamento de Química, 14040-901, Ribeirão Preto, Brazil
| | - Colin Farquharson
- Division of Developmental Biology, The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Easter Bush, Roslin, Midlothian, Edinburgh, EH25 9RG, UK
| | - Sadik C Esener
- Cancer Early Detection Advanced Research Center, Knight Cancer Institute, Oregon Health & Science University, Portland, OR, 97201, USA; Department of Bioengineering, University of California San Diego, La Jolla, CA, 92093, USA
| | - José L Millan
- Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, 92037, USA
| | - Massimo Bottini
- Nanoscience & Nanotechnology & Innovative Instrumentation (NAST) Centre, University of Rome Tor Vergata, Rome, Italy; Department of Experimental Medicine, University of Rome Tor Vergata, Rome, Italy; Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, 92037, USA.
| |
Collapse
|
11
|
Kamble S, Patil S, Kulkarni M, Murthy AVR. Spectroscopic Ellipsometry of fluid and gel phase lipid bilayers in hydrated conditions. Colloids Surf B Biointerfaces 2019; 176:55-61. [DOI: 10.1016/j.colsurfb.2018.12.061] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Revised: 11/20/2018] [Accepted: 12/20/2018] [Indexed: 11/26/2022]
|
12
|
Characterization and lipid phase effect on the interaction of GBV-C E2-derived peptide, P6-2VIR576, with lipid membranes relating it with the HIV-1 FP inhibition. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2018.06.033] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
|
13
|
Bolean M, Borin IA, Simão AMS, Bottini M, Bagatolli LA, Hoylaerts MF, Millán JL, Ciancaglini P. Topographic analysis by atomic force microscopy of proteoliposomes matrix vesicle mimetics harboring TNAP and AnxA5. BIOCHIMICA ET BIOPHYSICA ACTA. BIOMEMBRANES 2017; 1859:1911-1920. [PMID: 28549727 PMCID: PMC5793902 DOI: 10.1016/j.bbamem.2017.05.010] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Revised: 05/02/2017] [Accepted: 05/17/2017] [Indexed: 01/28/2023]
Abstract
Atomic force microscopy (AFM) is one of the most commonly used scanning probe microscopy techniques for nanoscale imaging and characterization of lipid-based particles. However, obtaining images of such particles using AFM is still a challenge. The present study extends the capabilities of AFM to the characterization of proteoliposomes, a special class of liposomes composed of lipids and proteins, mimicking matrix vesicles (MVs) involved in the biomineralization process. To this end, proteoliposomes were synthesized, composed of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) and 1,2-dipalmitoyl-sn-glycero-3-phospho-l-serine (DPPS), with inserted tissue-nonspecific alkaline phosphatase (TNAP) and/or annexin V (AnxA5), both characteristic proteins of osteoblast-derived MVs. We then aimed to study how TNAP and AnxA5 insertion affects the proteoliposomes' membrane properties and, in turn, interactions with type II collagen, thus mimicking early MV activity during biomineralization. AFM images of these proteoliposomes, acquired in dynamic mode, revealed the presence of surface protrusions with distinct viscoelasticity, thus suggesting that the presence of the proteins induced local changes in membrane fluidity. Surface protrusions were measurable in TNAP-proteoliposomes but barely detectable in AnxA5-proteoliposomes. More complex surface structures were observed for proteoliposomes harboring both TNAP and AnxA5 concomitantly, resulting in a lower affinity for type II collagen fibers compared to proteoliposomes harboring AnxA5 alone. The present study achieved the topographic analysis of lipid vesicles by direct visualization of structural changes, resulting from protein incorporation, without the need for fluorescent probes.
Collapse
Affiliation(s)
- Maytê Bolean
- Depto. Química, FFCLRP-USP, Universidade de São Paulo, Ribeirão Preto, SP, Brazil.
| | - Ivana A Borin
- Depto. Química, FFCLRP-USP, Universidade de São Paulo, Ribeirão Preto, SP, Brazil
| | - Ana M S Simão
- Depto. Química, FFCLRP-USP, Universidade de São Paulo, Ribeirão Preto, SP, Brazil
| | - Massimo Bottini
- Department of Experimental Medicine and Surgery, University of Rome Tor Vergata, Rome, Italy; Inflammatory and Infectious Disease Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, USA
| | - Luis A Bagatolli
- MEMPHYS - Center for Biomembrane Physics, University of Southern Denmark, Odense, Denmark
| | - Marc F Hoylaerts
- Department of Cardiovascular Sciences, Center for Molecular and Vascular Biology, University of Leuven, Leuven, Belgium
| | - José L Millán
- Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, USA
| | - Pietro Ciancaglini
- Depto. Química, FFCLRP-USP, Universidade de São Paulo, Ribeirão Preto, SP, Brazil.
| |
Collapse
|
14
|
Pan J, Sahoo PK, Dalzini A, Hayati Z, Aryal CM, Teng P, Cai J, Gutierrez HR, Song L. Membrane Disruption Mechanism of a Prion Peptide (106-126) Investigated by Atomic Force Microscopy, Raman and Electron Paramagnetic Resonance Spectroscopy. J Phys Chem B 2017; 121:5058-5071. [PMID: 28459565 PMCID: PMC5770145 DOI: 10.1021/acs.jpcb.7b02772] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A fragment of the human prion protein spanning residues 106-126 (PrP106-126) recapitulates many essential properties of the disease-causing protein such as amyloidogenicity and cytotoxicity. PrP106-126 has an amphipathic characteristic that resembles many antimicrobial peptides (AMPs). Therefore, the toxic effect of PrP106-126 could arise from a direct association of monomeric peptides with the membrane matrix. Several experimental approaches are employed to scrutinize the impacts of monomeric PrP106-126 on model lipid membranes. Porous defects in planar bilayers are observed by using solution atomic force microscopy. Adding cholesterol does not impede defect formation. A force spectroscopy experiment shows that PrP106-126 reduces Young's modulus of planar lipid bilayers. We use Raman microspectroscopy to study the effect of PrP106-126 on lipid atomic vibrational dynamics. For phosphatidylcholine lipids, PrP106-126 disorders the intrachain conformation, while the interchain interaction is not altered; for phosphatidylethanolamine lipids, PrP106-126 increases the interchain interaction, while the intrachain conformational order remains similar. We explain the observed differences by considering different modes of peptide insertion. Finally, electron paramagnetic resonance spectroscopy shows that PrP106-126 progressively decreases the orientational order of lipid acyl chains in magnetically aligned bicelles. Together, our experimental data support the proposition that monomeric PrP106-126 can disrupt lipid membranes by using similar mechanisms found in AMPs.
Collapse
Affiliation(s)
- Jianjun Pan
- Department of Physics, University of South Florida, Tampa, Florida 33620, United States
| | - Prasana K. Sahoo
- Department of Physics, University of South Florida, Tampa, Florida 33620, United States
| | - Annalisa Dalzini
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - Zahra Hayati
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - Chinta M. Aryal
- Department of Physics, University of South Florida, Tampa, Florida 33620, United States
| | - Peng Teng
- Department of Chemistry, University of South Florida, Tampa, Florida 33620, United States
| | - Jianfeng Cai
- Department of Chemistry, University of South Florida, Tampa, Florida 33620, United States
| | | | - Likai Song
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| |
Collapse
|
15
|
Mangiarotti A, Wilke N. Electrostatic interactions at the microscale modulate dynamics and distribution of lipids in bilayers. SOFT MATTER 2017; 13:686-694. [PMID: 28009904 DOI: 10.1039/c6sm01957a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
For decades, it has been assumed that electrostatic long-range (micron distances) repulsions in lipid bilayers are negligible due to screening from the aqueous milieu. This concept, mostly derived from theoretical calculations, is broadly accepted in the biophysical community. Here we present experimental evidence showing that domain-domain electrostatic repulsions in charged and also in neutral lipid bilayers regulate the diffusion, in-plane structuring and merging of lipid domains in the micron range. All the experiments were performed on both, lipid monolayers and bilayers, and the remarkable similarity in the results found in bilayers compared to monolayers led us to propose that inter-domain repulsions occur mainly within the plane of the membrane. Finally, our results indicate that electrostatic interactions between the species inserted in a cell membrane are not negligible, not only at nanometric but also at larger distances, suggesting another manner for regulating the membrane properties.
Collapse
Affiliation(s)
- Agustín Mangiarotti
- Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC, UNC-CONICET), Departamento de Química Biológica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Haya de la Torre y Medina Allende, Ciudad Universitaria, X5000HUA, Córdoba, Argentina.
| | - Natalia Wilke
- Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC, UNC-CONICET), Departamento de Química Biológica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Haya de la Torre y Medina Allende, Ciudad Universitaria, X5000HUA, Córdoba, Argentina.
| |
Collapse
|
16
|
Darvish A, Goyal G, Aneja R, Sundaram RVK, Lee K, Ahn CW, Kim KB, Vlahovska PM, Kim MJ. Nanoparticle mechanics: deformation detection via nanopore resistive pulse sensing. NANOSCALE 2016; 8:14420-14431. [PMID: 27321911 DOI: 10.1039/c6nr03371g] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Solid-state nanopores have been widely used in the past for single-particle analysis of nanoparticles, liposomes, exosomes and viruses. The shape of soft particles, particularly liposomes with a bilayer membrane, can greatly differ inside the nanopore compared to bulk solution as the electric field inside the nanopores can cause liposome electrodeformation. Such deformations can compromise size measurement and characterization of particles, but are often neglected in nanopore resistive pulse sensing. In this paper, we investigated the deformation of various liposomes inside nanopores. We observed a significant difference in resistive pulse characteristics between soft liposomes and rigid polystyrene nanoparticles especially at higher applied voltages. We used theoretical simulations to demonstrate that the difference can be explained by shape deformation of liposomes as they translocate through the nanopores. Comparing our results with the findings from electrodeformation experiments, we demonstrated that the rigidity of liposomes can be qualitatively compared using resistive pulse characteristics. This application of nanopores can provide new opportunities to study the mechanics at the nanoscale, to investigate properties of great value in fundamental biophysics and cellular mechanobiology, such as virus deformability and fusogenicity, and in applied sciences for designing novel drug/gene delivery systems.
Collapse
Affiliation(s)
- Armin Darvish
- School of Biomedical Engineering, Science and Health Systems, Drexel University, Philadelphia, PA 19104, USA.
| | | | | | | | | | | | | | | | | |
Collapse
|
17
|
Takechi-Haraya Y, Sakai-Kato K, Abe Y, Kawanishi T, Okuda H, Goda Y. Atomic Force Microscopic Analysis of the Effect of Lipid Composition on Liposome Membrane Rigidity. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:6074-6082. [PMID: 27232007 DOI: 10.1021/acs.langmuir.6b00741] [Citation(s) in RCA: 94] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Mechanical rigidity of the liposome membrane is often defined by the membrane bending modulus and is one of the determinants of liposome stability, but the quantitative experimental data are still limited to a few kinds of liposomes. Here, we used atomic force microscopy to investigate the membrane bending moduli of liposomes by immobilizing them on bovine serum albumin-coated glass in aqueous medium. The following lipids were used for liposome preparation: egg yolk phosphatidylcholine, dioleoylphosphatidylcholine, hydrogenated soybean phosphatidylcholine, dipalmitoylphosphatidylcholine, 1,2-dioleoyl-3-trimethylammonium-propane, cholesterol, and N-(carbonylmethoxypoly(ethylene glycol) 2000)-1,2-distearoyl-sn-glycero-3-phosphoethanolamine. By using liposomes of various compositions, we showed that the thermodynamic phase state of the membrane rather than the electric potential or liposome surface modification with poly(ethylene glycol) is the predominant determinant of the bending modulus, which decreased in the following order: solid ordered > liquid ordered > liquid disordered. By using the generalized polarization value of the Laurdan fluorescent probe, we investigated membrane rigidity in terms of membrane fluidity. Atomic force microscopic analysis was superior to the Laurdan method, especially in evaluating the membrane rigidity of liposomes containing hydrogenated soybean phosphatidylcholine and cholesterol. Positively charged liposomes with a large bending modulus were taken up by cells more efficiently than those with a small bending modulus. These findings offer a quantitative method of analyzing the membrane rigidity of nanosized liposomes with different lipid compositions and will contribute to the control of liposome stability and cellular uptake efficiency of liposomal formulations intended for clinical use.
Collapse
Affiliation(s)
- Yuki Takechi-Haraya
- Japan Agency for Medical Research and Development, 1-7-1 Otemachi, Chiyoda-ku, Tokyo 100-0004, Japan
- Division of Drugs, National Institute of Health Sciences , 1-18-1 Kamiyoga, Setagaya-ku, Tokyo 158-8501, Japan
| | - Kumiko Sakai-Kato
- Division of Drugs, National Institute of Health Sciences , 1-18-1 Kamiyoga, Setagaya-ku, Tokyo 158-8501, Japan
| | - Yasuhiro Abe
- Division of Drugs, National Institute of Health Sciences , 1-18-1 Kamiyoga, Setagaya-ku, Tokyo 158-8501, Japan
| | - Toru Kawanishi
- National Institute of Health Sciences, 1-18-1 Kamiyoga, Setagaya-ku, Tokyo 158-8501, Japan
| | - Haruhiro Okuda
- National Institute of Health Sciences, 1-18-1 Kamiyoga, Setagaya-ku, Tokyo 158-8501, Japan
| | - Yukihiro Goda
- Division of Drugs, National Institute of Health Sciences , 1-18-1 Kamiyoga, Setagaya-ku, Tokyo 158-8501, Japan
| |
Collapse
|
18
|
Keidel A, Bartsch TF, Florin EL. Direct observation of intermediate states in model membrane fusion. Sci Rep 2016; 6:23691. [PMID: 27029285 PMCID: PMC4814778 DOI: 10.1038/srep23691] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2015] [Accepted: 03/09/2016] [Indexed: 12/28/2022] Open
Abstract
We introduce a novel assay for membrane fusion of solid supported membranes on silica beads and on coverslips. Fusion of the lipid bilayers is induced by bringing an optically trapped bead in contact with the coverslip surface while observing the bead's thermal motion with microsecond temporal and nanometer spatial resolution using a three-dimensional position detector. The probability of fusion is controlled by the membrane tension on the particle. We show that the progression of fusion can be monitored by changes in the three-dimensional position histograms of the bead and in its rate of diffusion. We were able to observe all fusion intermediates including transient fusion, formation of a stalk, hemifusion and the completion of a fusion pore. Fusion intermediates are characterized by axial but not lateral confinement of the motion of the bead and independently by the change of its rate of diffusion due to the additional drag from the stalk-like connection between the two membranes. The detailed information provided by this assay makes it ideally suited for studies of early events in pure lipid bilayer fusion or fusion assisted by fusogenic molecules.
Collapse
Affiliation(s)
- Andrea Keidel
- Center for Nonlinear Dynamics and Department of Physics, University of Texas at Austin, Austin, Texas 78712, USA
| | - Tobias F. Bartsch
- Center for Nonlinear Dynamics and Department of Physics, University of Texas at Austin, Austin, Texas 78712, USA
- Howard Hughes Medical Institute and Laboratory of Sensory Neuroscience, The Rockefeller University, New York, New York, 10065, USA
| | - Ernst-Ludwig Florin
- Center for Nonlinear Dynamics and Department of Physics, University of Texas at Austin, Austin, Texas 78712, USA
| |
Collapse
|
19
|
González-Henríquez C, Pizarro-Guerra G, Córdova-Alarcón E, Sarabia-Vallejos M, Terraza-Inostroza C. Artificial biomembranes stabilized over spin coated hydrogel scaffolds. Crosslinking agent nature induces wrinkled or flat surfaces on the hydrogel. Chem Phys Lipids 2016; 196:13-23. [DOI: 10.1016/j.chemphyslip.2016.02.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2015] [Revised: 01/13/2016] [Accepted: 02/02/2016] [Indexed: 12/19/2022]
|
20
|
Wu HL, Tong Y, Peng Q, Li N, Ye S. Phase transition behaviors of the supported DPPC bilayer investigated by sum frequency generation (SFG) vibrational spectroscopy and atomic force microscopy (AFM). Phys Chem Chem Phys 2016; 18:1411-21. [DOI: 10.1039/c5cp04960a] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The phase transition behaviors of a supported bilayer of dipalmitoylphosphatidyl-choline (DPPC) have been systematically evaluated by in situ sum frequency generation (SFG) vibrational spectroscopy and atomic force microscopy (AFM).
Collapse
Affiliation(s)
- Heng-Liang Wu
- Catalysis Research Center
- Hokkaido University
- Sapporo 001-0021
- Japan
| | - Yujin Tong
- Catalysis Research Center
- Hokkaido University
- Sapporo 001-0021
- Japan
| | - Qiling Peng
- Catalysis Research Center
- Hokkaido University
- Sapporo 001-0021
- Japan
| | - Na Li
- Catalysis Research Center
- Hokkaido University
- Sapporo 001-0021
- Japan
| | - Shen Ye
- Catalysis Research Center
- Hokkaido University
- Sapporo 001-0021
- Japan
| |
Collapse
|
21
|
Ha Y, Katz LE, Liljestrand HM. Distribution of Fullerene Nanoparticles between Water and Solid Supported Lipid Membranes: Thermodynamics and Effects of Membrane Composition on Distribution. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015; 49:14546-53. [PMID: 26569041 DOI: 10.1021/acs.est.5b03339] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The distribution coefficient (Klipw) of fullerene between solid supported lipid membranes (SSLMs) and water was examined using different lipid membrane compositions. Klipw of fullerene was significantly higher with a cationic lipid membrane compared to that with a zwitterionic or anionic lipid membrane, potentially due to the strong interactions between negative fullerene dispersions and positive lipid head groups. The higher Klipw for fullerene distribution to ternary lipid mixture membranes was attributed to an increase in the interfacial surface area of the lipid membrane resulting from phase separation. These results imply that lipid composition can be a critical factor that affects bioconcentration of fullerene. Distribution of fullerene into zwitterionic unsaturated lipid membranes was dominated by the entropy contribution (ΔS) and the process was endothermic (ΔH > 0). This result contrasts the partitioning thermodynamics of highly and moderately hydrophobic chemicals indicating that the lipid-water distribution mechanism of fullerene may be different from that of molecular level chemicals. Potential mechanisms for the distribution of fullerene that may explain these differences include adsorption on the lipid membrane surfaces and partitioning into the center of lipid membranes (i.e., absorption).
Collapse
Affiliation(s)
- Yeonjeong Ha
- Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin , Austin, Texas 78712, United States
| | - Lynn E Katz
- Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin , Austin, Texas 78712, United States
| | - Howard M Liljestrand
- Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin , Austin, Texas 78712, United States
| |
Collapse
|
22
|
Musgrove A, Bizzotto D. Potential Controls the Interaction of Liposomes with Octadecanol-Modified Au Electrodes: An in Situ AFM Study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:12797-12806. [PMID: 26528884 DOI: 10.1021/acs.langmuir.5b03605] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The formation of supported lipid bilayers using liposomes requires interaction with the solid surface, rupture of the liposome, and spreading to cover the surface with a lipid bilayer. This can result in a less-than-uniform coating of the solid surface. Presented is a method that uses the electrochemical poration of an adsorbed lipid-like layer on a Au electrode to control the interaction of 100 nm DOPC liposomes. An octadecanol-coated Au-on-mica surface was imaged using tapping-mode AFM during the application of potential in the presence or absence of liposomes. When the substrate potential was made negative enough, defects formed in the adsorbed layer and new taller features were observed. More features were observed and existing features increased in size with time spent at this negative poration potential. The new features were 1.8-2.0 nm higher than the octadecanol-coated gold surface, half the thickness of a DOPC bilayer. These features were not observed in the absence of liposomes when undergoing the same potential perturbation. In the presence of liposomes, the application of a poration potential was needed to initiate the formation of these taller features. Once the applied potential was removed, the features stopped growing and no new regions were observed. The size of these new regions was consistent with the footprint of a flattened 100 nm liposome. It is speculated that the DOPC liposomes were able to interact with the defects and became soluble in the octadecanol, creating a taller region that was limited in size to the liposome that adsorbed and became incorporated. This AFM study confirms previous in situ fluorescence measurements of the same system and illustrates the use of a potential perturbation to control the formation of these regions of increased DOPC content.
Collapse
Affiliation(s)
- Amanda Musgrove
- AMPEL, Department of Chemistry, University of British Columbia , Vancouver, British Columbia V6T 1Z4, Canada
| | - Dan Bizzotto
- AMPEL, Department of Chemistry, University of British Columbia , Vancouver, British Columbia V6T 1Z4, Canada
| |
Collapse
|
23
|
Mangiarotti A, Wilke N. Energetics of the Phase Transition in Free-Standing versus Supported Lipid Membranes. J Phys Chem B 2015; 119:8718-24. [DOI: 10.1021/acs.jpcb.5b04397] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Agustín Mangiarotti
- Centro
de Investigaciones
en Química Biológica de Córdoba (CIQUIBIC, UNC−CONICET),
Departamento de Química Biológica, Facultad de Ciencias
Químicas, Universidad Nacional de Córdoba, Haya de la Torre y Medina
Allende, Ciudad Universitaria, X5000HUA Córdoba, Argentina
| | - Natalia Wilke
- Centro
de Investigaciones
en Química Biológica de Córdoba (CIQUIBIC, UNC−CONICET),
Departamento de Química Biológica, Facultad de Ciencias
Químicas, Universidad Nacional de Córdoba, Haya de la Torre y Medina
Allende, Ciudad Universitaria, X5000HUA Córdoba, Argentina
| |
Collapse
|
24
|
Volkov V. Tip-induced deformation of a phospholipid bilayer: theoretical perspective of sum frequency generation imaging. J Chem Phys 2014; 141:154201. [PMID: 25338888 DOI: 10.1063/1.4897987] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
The paper addresses theory of Sum Frequency Generation imaging of an atomic force microscopy tip-induced deformation of a bilayer phospholipid membrane deposited over a pore: known as a nano-drum system. Image modeling employed nonlinearities of the normal modes specific to hydrocarbon terminal methyls, which are distributed about the deformed surfaces of inner and outer leaflets. The deformed profiles are according to the solutions of shape equation for Canham-Helfrich Hamiltonian accounting properties of four membranes, which differ in elasticity and adhesion. The results indicate that in continuous deformed surfaces, the difference in the curvature of the outer and inner leaflets dominates in the imaged nonlinearity. This is different comparing to the results for a perfect bilayer spherical cap system (the subject of previous study), where nonlinear image response is dominated by the mismatch of the inner and outer leaflets' surface areas (as projected to the image plane) at the edge of perfectly spherical structure. The results of theoretical studies, here, demonstrate that Sum Frequency Generation imaging in continuous and deformed bilayer surfaces are helpful to address curvature locally and anticipate mechanical properties of membrane. The articles discuss applicability and practical limitations of the approach. Combination of Atomic Force Microscopy and Sum Frequency Generation imaging under controlled tip-induced deformation provides a good opportunity to probe and test membranes physical properties with rigor of adopted theory.
Collapse
Affiliation(s)
- Victor Volkov
- Bereozovaya 2A, Konstantinovo, Moscow Region 140207, Russian Federation
| |
Collapse
|
25
|
Alessandrini A, Facci P. Phase transitions in supported lipid bilayers studied by AFM. SOFT MATTER 2014; 10:7145-7164. [PMID: 25090108 DOI: 10.1039/c4sm01104j] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We review the capabilities of Atomic Force Microscopy (AFM) in the study of phase transitions in Supported Lipid Bilayers (SLBs). AFM represents a powerful technique to cover the resolution range not available to fluorescence imaging techniques and where spectroscopic data suggest what the relevant lateral scale for domain formation might be. Phase transitions of lipid bilayers involve the formation of domains characterized by different heights with respect to the surrounding phase and are therefore easily identified by AFM in liquid solution once the bilayer is confined to a flat surface. Even if not endowed with high time resolution, AFM allows light to be shed on some aspects related to lipid phase transitions in the case of both a single lipid component and lipid mixtures containing sterols also. We discuss here the obtained results in light of the peculiarities of supported lipid bilayer model systems.
Collapse
Affiliation(s)
- Andrea Alessandrini
- Dipartimento di Scienze Fisiche, Informatiche e Matematiche, Via Campi 213/A, 41125, Modena, Italy.
| | | |
Collapse
|
26
|
Suárez-Germà C, Morros A, Montero M, Hernández-Borrell J, Domènech Ò. Combined force spectroscopy, AFM and calorimetric studies to reveal the nanostructural organization of biomimetic membranes. Chem Phys Lipids 2014; 183:208-17. [DOI: 10.1016/j.chemphyslip.2014.07.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2014] [Revised: 07/14/2014] [Accepted: 07/28/2014] [Indexed: 01/12/2023]
|
27
|
Ramkaran M, Badia A. Gel-to-Fluid Phase Transformations in Solid-Supported Phospholipid Bilayers Assembled by the Langmuir–Blodgett Technique: Effect of the Langmuir Monolayer Phase State and Molecular Density. J Phys Chem B 2014; 118:9708-21. [DOI: 10.1021/jp504092b] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Mohini Ramkaran
- Department of Chemistry,
FRQNT Centre for Self-Assembled Chemical Structures, Université de Montréal, C.P. 6128 succursale Centre-ville, Montréal, QC H3C 3J7, Canada
| | - Antonella Badia
- Department of Chemistry,
FRQNT Centre for Self-Assembled Chemical Structures, Université de Montréal, C.P. 6128 succursale Centre-ville, Montréal, QC H3C 3J7, Canada
| |
Collapse
|
28
|
Ott M, Shai Y, Haran G. Single-particle tracking reveals switching of the HIV fusion peptide between two diffusive modes in membranes. J Phys Chem B 2013; 117:13308-21. [PMID: 23915358 DOI: 10.1021/jp4039418] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Fusion of the HIV membrane with that of a target T cell is an essential first step in the viral infection process. Here we describe single-particle tracking (SPT) studies of a 16-amino-acid peptide derived from the HIV fusion protein (FP16), as it interacts with a supported lipid bilayer. FP16 was found to spontaneously insert into and move within the bilayer with two different modes of diffusion, a fast mode with a diffusion coefficient typical of protein motion in membranes and a much slower one. We observed transitions between the two modes: slow peptides were found to speed up, and fast peptides could slow down. Hidden Markov model analysis was employed as a method for the identification of the two modes in single-molecule trajectories and analysis of their interconversion rates. Surprisingly, the diffusion coefficients of the two modes were found to depend differently on solution viscosity. Thus, whereas the fast diffusive mode behaved as predicted by the Saffman-Delbrück theory, the slow mode behaved according to the Stokes-Einstein relation. To further characterize the two diffusive modes, FP16 molecules were studied in bilayers cooled through their liquid crystalline-to-gel phase transition. Our analysis suggested that the slow diffusive mode might originate from the formation of large objects, such as lipid domains or local protrusions, which are induced by the peptides and move together with them.
Collapse
Affiliation(s)
- Maria Ott
- Departments of Chemical Physics and ‡Biological Chemistry, Weizmann Institute of Science , Rehovot 76100, Israel
| | | | | |
Collapse
|
29
|
Sorkin R, Kampf N, Dror Y, Shimoni E, Klein J. Origins of extreme boundary lubrication by phosphatidylcholine liposomes. Biomaterials 2013; 34:5465-75. [PMID: 23623226 DOI: 10.1016/j.biomaterials.2013.03.098] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2013] [Accepted: 03/31/2013] [Indexed: 11/29/2022]
Abstract
Phosphatidylcholine (PC) vesicles have been shown to have remarkable boundary lubricating properties under physiologically-high pressures. Here we carry out a systematic study, using a surface force balance, of the normal and shear (frictional) forces between two opposing surfaces bearing different PC vesicles across water, to elucidate the origin of these properties. Small unilamellar vesicles (SUVs, diameters < 100 nm) of the symmetric saturated diacyl PCs DMPC (C(14)), DPPC (C(16)) and DSPC (C(18)) attached to mica surfaces were studied in their solid-ordered (SO) phase on the surface. Overall liposome lubrication ability improves markedly with increasing acyl chain length, and correlates strongly with the liposomes' structural integrity on the substrate surface: DSPC-SUVs were stable on the surface, and provided extremely efficient lubrication (friction coefficient μ ≈ 10(-4)) at room temperature at pressures up to at least 18 MPa. DMPC-SUVs ruptured following adsorption, providing poor high-pressure lubrication, while DPPC-SUVs behavior was intermediate between the two. These results can be well understood in terms of the hydration-lubrication paradigm, but suggest that an earlier conjecture, that highly-efficient lubrication by PC-SUVs depended simply on their being in the SO rather than in the liquid-disordered phase, should be more nuanced. Our results indicate that the resistance of the SUVs to mechanical deformation and rupture is the dominant factor in determining their overall boundary lubrication efficiency in our system.
Collapse
Affiliation(s)
- Raya Sorkin
- Materials and Interfaces Department, Weizmann Institute of Science, Rehovot 76100, Israel
| | | | | | | | | |
Collapse
|
30
|
Wu H, Yu L, Tong Y, Ge A, Yau S, Osawa M, Ye S. Enzyme-catalyzed hydrolysis of the supported phospholipid bilayers studied by atomic force microscopy. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2013; 1828:642-51. [DOI: 10.1016/j.bbamem.2012.09.010] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2012] [Revised: 09/06/2012] [Accepted: 09/07/2012] [Indexed: 01/17/2023]
|
31
|
Khanbabaie R, Jahanshahi M. Revolutionary impact of nanodrug delivery on neuroscience. Curr Neuropharmacol 2012; 10:370-92. [PMID: 23730260 PMCID: PMC3520046 DOI: 10.2174/157015912804143513] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2012] [Revised: 08/09/2012] [Accepted: 08/28/2012] [Indexed: 12/23/2022] Open
Abstract
Brain research is the most expanding interdisciplinary research that is using the state of the art techniques to overcome limitations in order to conduct more accurate and effective experiments. Drug delivery to the target site in the central nervous system (CNS) is one of the most difficult steps in neuroscience researches and therapies. Taking advantage of the nanoscale structure of neural cells (both neurons and glia); nanodrug delivery (second generation of biotechnological products) has a potential revolutionary impact into the basic understanding, visualization and therapeutic applications of neuroscience. Current review article firstly provides an overview of preparation and characterization, purification and separation, loading and delivering of nanodrugs. Different types of nanoparticle bioproducts and a number of methods for their fabrication and delivery systems including (carbon) nanotubes are explained. In the second part, neuroscience and nervous system drugs are deeply investigated. Different mechanisms in which nanoparticles enhance the uptake and clearance of molecules form cerebrospinal fluid (CSF) are discussed. The focus is on nanodrugs that are being used or have potential to improve neural researches, diagnosis and therapy of neurodegenerative disorders.
Collapse
Affiliation(s)
- Reza Khanbabaie
- Nanotechnology Research Institute, Babol University of Technology, Babol, Iran
- Faculty of Basic Science, Department of Physics, Babol University of Technology, Babol, Iran
- Department of Physics, University of Ottawa, Ottawa, Canada
| | - Mohsen Jahanshahi
- Nanotechnology Research Institute, Babol University of Technology, Babol, Iran
- Faculty of Chemical Engineering, Babol University of Technology, Babol, Iran
| |
Collapse
|
32
|
Picas L, Milhiet PE, Hernández-Borrell J. Atomic force microscopy: a versatile tool to probe the physical and chemical properties of supported membranes at the nanoscale. Chem Phys Lipids 2012. [PMID: 23194897 DOI: 10.1016/j.chemphyslip.2012.10.005] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Atomic force microscopy (AFM) was developed in the 1980s following the invention of its precursor, scanning tunneling microscopy (STM), earlier in the decade. Several modes of operation have evolved, demonstrating the extreme versatility of this method for measuring the physicochemical properties of samples at the nanoscopic scale. AFM has proved an invaluable technique for visualizing the topographic characteristics of phospholipid monolayers and bilayers, such as roughness, height or laterally segregated domains. Implemented modes such as phase imaging have also provided criteria for discriminating the viscoelastic properties of different supported lipid bilayer (SLB) regions. In this review, we focus on the AFM force spectroscopy (FS) mode, which enables determination of the nanomechanical properties of membrane models. The interpretation of force curves is presented, together with newly emerging techniques that provide complementary information on physicochemical properties that may contribute to our understanding of the structure and function of biomembranes. Since AFM is an imaging technique, some basic indications on how real-time AFM imaging is evolving are also presented at the end of this paper.
Collapse
Affiliation(s)
- Laura Picas
- Institut Curie, CNRS UMR 144, 26 rue d'Ulm, 75248 Paris, France
| | | | | |
Collapse
|
33
|
Morandat S, Azouzi S, Beauvais E, Mastouri A, El Kirat K. Atomic force microscopy of model lipid membranes. Anal Bioanal Chem 2012; 405:1445-61. [DOI: 10.1007/s00216-012-6383-y] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2012] [Revised: 08/02/2012] [Accepted: 08/24/2012] [Indexed: 10/27/2022]
|
34
|
Sadeghi S, Vink RLC. Main transition in the Pink membrane model: finite-size scaling and the influence of surface roughness. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2012; 85:061912. [PMID: 23005132 DOI: 10.1103/physreve.85.061912] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2012] [Indexed: 06/01/2023]
Abstract
We consider the main transition in single-component membranes using computer simulations of the Pink model [D. A. Pink et al., Biochemistry 19, 349 (1980)]. We first show that the accepted parameters of the Pink model yield a main transition temperature that is systematically below experimental values. This resolves an issue that was first pointed out by Corvera and co-workers [Phys. Rev. E 47, 696 (1993)]. In order to yield the correct transition temperature, the strength of the van der Waals coupling in the Pink model must be increased; by using finite-size scaling, a set of optimal values is proposed. We also provide finite-size scaling evidence that the Pink model belongs to the universality class of the two-dimensional Ising model. This finding holds irrespective of the number of conformational states. Finally, we address the main transition in the presence of quenched disorder, which may arise in situations where the membrane is deposited on a rough support. In this case, we observe a stable multidomain structure of gel and fluid domains, and the absence of a sharp transition in the thermodynamic limit.
Collapse
Affiliation(s)
- Sina Sadeghi
- Institute of Theoretical Physics, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany
| | | |
Collapse
|
35
|
González H C, Volkmann UG, Retamal MJ, Cisternas M, Sarabia MA, López KA. Thermal behavior of 1,2-dipalmitoyl-sn-3-phosphoglycerocholine bi- and multi-layers, deposited with physical vapor deposition under ellipsometric growth control. J Chem Phys 2012; 136:134709. [PMID: 22482582 DOI: 10.1063/1.3698486] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
1,2-dipalmitoyl-sn-3-phosphoglycerocholine membranes were deposited onto a silicon substrate (Si/SiO(2)) using physical vapor deposition with in situ ellipsometric thickness control. Along several heating cycles it was possible to identify well-defined boundaries for gel, ripple, liquid crystalline, and fluid-disordered phases. Particularly, the second order transition between gel and ripple phase was clearly identified in the range of ~28-34 °C using Raman spectroscopy. Atomic force microscopy and imaging ellipsometry (IE) were used to observe and characterize the ripple phase undulations of period λ = 20.8 nm and average height h = 19.95 nm along the temperature interval of ~34 to 40 °C. Clusters/agglomerations heights of more than twice the membrane thickness were observed with IE, induced by heating cycles.
Collapse
Affiliation(s)
- Carmen González H
- Facultad de Física, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860-Santiago, 7820436 Chile.
| | | | | | | | | | | |
Collapse
|
36
|
Fischer T, Vink RLC. Domain formation in membranes with quenched protein obstacles: Lateral heterogeneity and the connection to universality classes. J Chem Phys 2011; 134:055106. [DOI: 10.1063/1.3530587] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
|
37
|
Yarrow F, Kuipers BWM. AFM study of the thermotropic behaviour of supported DPPC bilayers with and without the model peptide WALP23. Chem Phys Lipids 2010; 164:9-15. [PMID: 20932964 DOI: 10.1016/j.chemphyslip.2010.09.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2010] [Revised: 09/02/2010] [Accepted: 09/27/2010] [Indexed: 10/19/2022]
Abstract
Temperature-controlled Atomic Force Microscopy (TC-AFM) in Contact Mode is used here to directly image the mechanisms by which melting and crystallization of supported, hydrated DPPC bilayers proceed in the presence and absence of the model peptide WALP23. Melting from the gel L(β)' to the liquid-crystalline L(α) phase starts at pre-existing line-type packing defects (grain boundaries) in absence of the peptide. The exact transition temperature is shown to be influenced by the magnitude of the force exerted by the AFM probe on the bilayer, but is higher than the main transition temperature of non-supported DPPC vesicles in all cases due to bilayer-substrate interactions. Cooling of the fluid L(α) bilayer shows the formation of the line-type defects at the borders between different gel-phase regions that originate from different nuclei. The number of these defects depends directly on the rate of cooling through the transition, as predicted by classical nucleation theory. The presence of the transmembrane, synthetic model peptide WALP23 is known to give rise to heterogeneity in the bilayer as microdomains with a striped appearance are formed in the DPPC bilayer. This striated phase consists of alternating lines of lipids and peptide. It is shown here that melting starts with the peptide-associated lipids in the domains, whose melting temperature is lowered by 0.8-2.0°C compared to the remaining, peptide-free parts of the bilayer. The stabilization of the fluid phase is ascribed to adaptations of the lipids to the shorter peptide. The lipids not associated with the peptide melt at the same temperature as those in the pure DPPC supported bilayer.
Collapse
Affiliation(s)
- F Yarrow
- Condensed Matter and Interfaces, Debye Institute for Nanomaterials Science, Science Faculty, Utrecht University, P.O. Box 80000, 3508 TA, Utrecht, The Netherlands.
| | | |
Collapse
|
38
|
Ghosh S, Adhikari A, Sen Mojumdar S, Bhattacharyya K. A Fluorescence Correlation Spectroscopy Study of the Diffusion of an Organic Dye in the Gel Phase and Fluid Phase of a Single Lipid Vesicle. J Phys Chem B 2010; 114:5736-41. [DOI: 10.1021/jp911971p] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Subhadip Ghosh
- Physical Chemistry Department, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
| | - Aniruddha Adhikari
- Physical Chemistry Department, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
| | - Supratik Sen Mojumdar
- Physical Chemistry Department, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
| | - Kankan Bhattacharyya
- Physical Chemistry Department, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
| |
Collapse
|
39
|
AFM study of the interaction of cytochrome P450 2C9 with phospholipid bilayers. Chem Phys Lipids 2010; 163:182-9. [DOI: 10.1016/j.chemphyslip.2009.11.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2009] [Revised: 08/07/2009] [Accepted: 11/09/2009] [Indexed: 11/18/2022]
|
40
|
Takagi A, Hokonohara H, Kawai T. Flat hydrogel substrate for atomic force microscopy to observe liposomes and lipid membranes. Anal Bioanal Chem 2009; 395:2405-9. [DOI: 10.1007/s00216-009-3126-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2009] [Revised: 08/05/2009] [Accepted: 08/31/2009] [Indexed: 12/01/2022]
|
41
|
Seeger HM, Marino G, Alessandrini A, Facci P. Effect of physical parameters on the main phase transition of supported lipid bilayers. Biophys J 2009; 97:1067-76. [PMID: 19686654 PMCID: PMC2726303 DOI: 10.1016/j.bpj.2009.03.068] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2008] [Revised: 03/17/2009] [Accepted: 03/18/2009] [Indexed: 01/10/2023] Open
Abstract
Supported lipid bilayers composed of 1-palmitoyl-2-oleoyl-phosphatidylethanolamine (POPE) and 1-palmitoyl-2-oleoyl-phosphatidylglycerol (POPG) were assembled by the vesicle fusion technique on mica and studied by temperature-controlled atomic force microscopy. The role of different physical parameters on the main phase transition was elucidated. Both mixed (POPE/POPG 3:1) and pure POPE bilayers were studied. By increasing the ionic strength of the solution and the incubation temperature, a shift from a decoupled phase transition of the two leaflets, to a coupled transition, with domains in register, was obtained. The observed behavior points to a modulation of the substrate/bilayer and interleaflet coupling induced by the environment and preparation conditions of supported lipid bilayers. The results are discussed in view of the role of different interactions in the system. The influence of the substrate on the lipid bilayers, in terms of interleaflet coupling, can also help us in understanding the possible effect that submembrane elements like the cytoskeleton might have on the structure and dynamics of biomembranes.
Collapse
Affiliation(s)
- H M Seeger
- CNR-INFM-S3 National Center on Nanostructure and BioSystems at Surfaces, Modena, Italy
| | | | | | | |
Collapse
|
42
|
Abdulreda MH, Moy VT. Investigation of SNARE-Mediated Membrane Fusion Mechanism Using Atomic Force Microscopy. JAPANESE JOURNAL OF APPLIED PHYSICS (2008) 2009; 48:8JA03-8JA0310. [PMID: 20228892 PMCID: PMC2836841 DOI: 10.1143/jjap.48.08ja03] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Membrane fusion is driven by specialized proteins that reduce the free energy penalty for the fusion process. In neurons and secretory cells, soluble N-ethylmaleimide-sensitive factor-attachment protein (SNAP) receptors (SNAREs) mediate vesicle fusion with the plasma membrane during vesicular content release. Although, SNAREs have been widely accepted as the minimal machinery for membrane fusion, the specific mechanism for SNARE-mediated membrane fusion remains an active area of research. Here, we summarize recent findings based on force measurements acquired in a novel experimental system that uses atomic force microscope (AFM) force spectroscopy to investigate the mechanism(s) of membrane fusion and the role of SNAREs in facilitating membrane hemifusion during SNARE-mediated fusion. In this system, protein-free and SNARE-reconstituted lipid bilayers are formed on opposite (trans) substrates and the forces required to induce membrane hemifusion and fusion or to unbind single v-/t-SNARE complexes are measured. The obtained results provide evidence for a mechanism by which the pulling force generated by interacting trans-SNAREs provides critical proximity between the membranes and destabilizes the bilayers at fusion sites by broadening the hemifusion energy barrier and consequently making the membranes more prone to fusion.
Collapse
|
43
|
Nussio MR, Oncins G, Ridelis I, Szili E, Shapter JG, Sanz F, Voelcker NH. Nanomechanical Characterization of Phospholipid Bilayer Islands on Flat and Porous Substrates: A Force Spectroscopy Study. J Phys Chem B 2009; 113:10339-47. [DOI: 10.1021/jp811035g] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Matthew R. Nussio
- School of Chemistry, Physics and Earth Sciences, Flinders University, Sturt Road, Bedford Park, Adelaide, SA 5001, Australia, Scientific-Technical Services, Nanometric Techniques Unit, University of Barcelona, Soler i Sabaris 1, 08028 Barcelona, Spain, Nanoprobes and Nanoswitches, Institute for Bioengineering of Catalonia (IBEC), Baldiri Reixac 13,08028 Barcelona, Spain, Department of Physical Chemistry, Chemistry Faculty, University of Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain, and CIBER
| | - Gerard Oncins
- School of Chemistry, Physics and Earth Sciences, Flinders University, Sturt Road, Bedford Park, Adelaide, SA 5001, Australia, Scientific-Technical Services, Nanometric Techniques Unit, University of Barcelona, Soler i Sabaris 1, 08028 Barcelona, Spain, Nanoprobes and Nanoswitches, Institute for Bioengineering of Catalonia (IBEC), Baldiri Reixac 13,08028 Barcelona, Spain, Department of Physical Chemistry, Chemistry Faculty, University of Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain, and CIBER
| | - Ingrid Ridelis
- School of Chemistry, Physics and Earth Sciences, Flinders University, Sturt Road, Bedford Park, Adelaide, SA 5001, Australia, Scientific-Technical Services, Nanometric Techniques Unit, University of Barcelona, Soler i Sabaris 1, 08028 Barcelona, Spain, Nanoprobes and Nanoswitches, Institute for Bioengineering of Catalonia (IBEC), Baldiri Reixac 13,08028 Barcelona, Spain, Department of Physical Chemistry, Chemistry Faculty, University of Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain, and CIBER
| | - Endre Szili
- School of Chemistry, Physics and Earth Sciences, Flinders University, Sturt Road, Bedford Park, Adelaide, SA 5001, Australia, Scientific-Technical Services, Nanometric Techniques Unit, University of Barcelona, Soler i Sabaris 1, 08028 Barcelona, Spain, Nanoprobes and Nanoswitches, Institute for Bioengineering of Catalonia (IBEC), Baldiri Reixac 13,08028 Barcelona, Spain, Department of Physical Chemistry, Chemistry Faculty, University of Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain, and CIBER
| | - Joseph G. Shapter
- School of Chemistry, Physics and Earth Sciences, Flinders University, Sturt Road, Bedford Park, Adelaide, SA 5001, Australia, Scientific-Technical Services, Nanometric Techniques Unit, University of Barcelona, Soler i Sabaris 1, 08028 Barcelona, Spain, Nanoprobes and Nanoswitches, Institute for Bioengineering of Catalonia (IBEC), Baldiri Reixac 13,08028 Barcelona, Spain, Department of Physical Chemistry, Chemistry Faculty, University of Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain, and CIBER
| | - Fausto Sanz
- School of Chemistry, Physics and Earth Sciences, Flinders University, Sturt Road, Bedford Park, Adelaide, SA 5001, Australia, Scientific-Technical Services, Nanometric Techniques Unit, University of Barcelona, Soler i Sabaris 1, 08028 Barcelona, Spain, Nanoprobes and Nanoswitches, Institute for Bioengineering of Catalonia (IBEC), Baldiri Reixac 13,08028 Barcelona, Spain, Department of Physical Chemistry, Chemistry Faculty, University of Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain, and CIBER
| | - Nicolas H. Voelcker
- School of Chemistry, Physics and Earth Sciences, Flinders University, Sturt Road, Bedford Park, Adelaide, SA 5001, Australia, Scientific-Technical Services, Nanometric Techniques Unit, University of Barcelona, Soler i Sabaris 1, 08028 Barcelona, Spain, Nanoprobes and Nanoswitches, Institute for Bioengineering of Catalonia (IBEC), Baldiri Reixac 13,08028 Barcelona, Spain, Department of Physical Chemistry, Chemistry Faculty, University of Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain, and CIBER
| |
Collapse
|
44
|
Hao C, Sun R, Zhang J, Chang Y, Niu C. Behavior of sulfatide/cholesterol mixed monolayers at the air/water interface. Colloids Surf B Biointerfaces 2009; 69:201-6. [DOI: 10.1016/j.colsurfb.2008.11.013] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2008] [Revised: 10/13/2008] [Accepted: 11/17/2008] [Indexed: 11/26/2022]
|
45
|
Davis JH, Clair JJ, Juhasz J. Phase equilibria in DOPC/DPPC-d62/cholesterol mixtures. Biophys J 2009; 96:521-39. [PMID: 19167302 DOI: 10.1016/j.bpj.2008.09.042] [Citation(s) in RCA: 134] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2008] [Accepted: 09/30/2008] [Indexed: 01/18/2023] Open
Abstract
There is broad interest in the question of fluid-fluid phase coexistence in membranes, in particular, whether evidence for liquid-disordered (l(d))-liquid-ordered (l(o)) two-phase regions or membrane "rafts" can be found in natural membranes. In model membrane systems, such phase behavior is observed, and we have used deuterium nuclear magnetic resonance spectroscopy to map the phase boundaries of ternary mixtures containing 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC), chain-perdeuterated 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC-d(62)), and cholesterol. For both this ternary model system and the binary DPPC-d(62)/cholesterol system, we present clear evidence for l(d)-l(o) two-phase coexistence. We have selected sample compositions to focus on this region of fluid-fluid phase coexistence and to determine its temperature and composition ranges. The deuterium nuclear magnetic resonance spectra for compositions near the l(d)-l(o) phase boundary at high cholesterol concentrations show evidence of exchange broadening or critical fluctuations in composition, similar to that reported by Vist and Davis. There appears to be a line of critical compositions ranging from 48 degrees C for a DOPC/DPPC-d(62)/cholesterol composition of 0:75:25, to approximately -8 degrees C for the composition 57:14:29. At temperatures below this two-phase region, there is a region of three-phase coexistence (l(d)-l(o)-gel). These results are collected and presented in terms of a partial ternary phase diagram that is consistent with previously reported results of Vist and Davis.
Collapse
Affiliation(s)
- James H Davis
- Department of Physics, University of Guelph, Guelph, Ontario, Canada.
| | | | | |
Collapse
|
46
|
Nussio MR, Sykes MJ, Miners JO, Shapter JG. Kinetics membrane disruption due to drug interactions of chlorpromazine hydrochloride. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:1086-1090. [PMID: 19093750 DOI: 10.1021/la803288s] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Drug-membrane interactions assume considerable importance in pharmacokinetics and drug metabolism. Here, we present the interaction of chlorpromazine hydrochloride (CPZ) with supported phospholipid bilayers. It was demonstrated that CPZ binds rapidly to phospholipid bilayers, disturbing the molecular ordering of the phospholipids. These interactions were observed to follow first order kinetics, with an activation energy of approximately 420 kJ mol(-1). Time-dependent membrane disruption was also observed for the interaction with CPZ, such that holes appeared in the phospholipid bilayer after the interaction of CPZ. For this process of membrane disruption, "lag-burst" kinetics was demonstrated.
Collapse
Affiliation(s)
- Matthew R Nussio
- School of Chemistry, Physics and Earth Sciences, and Department of Clinical Pharmacology, Flinders University, Sturt Road, Bedford Park, Adelaide, SA 5001, Australia
| | | | | | | |
Collapse
|
47
|
Goksu EI, Vanegas JM, Blanchette CD, Lin WC, Longo ML. AFM for structure and dynamics of biomembranes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2009; 1788:254-66. [DOI: 10.1016/j.bbamem.2008.08.021] [Citation(s) in RCA: 112] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2008] [Revised: 08/26/2008] [Accepted: 08/31/2008] [Indexed: 12/17/2022]
|
48
|
Li M, Chen M, Sheepwash E, Brosseau CL, Li H, Pettinger B, Gruler H, Lipkowski J. AFM studies of solid-supported lipid bilayers formed at a Au(111) electrode surface using vesicle fusion and a combination of Langmuir-Blodgett and Langmuir-Schaefer techniques. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:10313-23. [PMID: 18712889 DOI: 10.1021/la800800m] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Atomic force microscopy (AFM) has been used to characterize the formation of a phospholipid bilayer composed of 1,2-dimyristyl-sn-glycero-3-phosphocholine (DMPC) at a Au(111) electrode surface. The bilayer was formed by one of two methods: fusion of lamellar vesicles or by the combination of Langmuir-Blodgett (LB) and Langmuir-Schaefer (LS) deposition. Results indicate that phospholipid vesicles rapidly adsorb and fuse to form a film at the electrode surface. The resulting film undergoes a very slow structural transformation until a characteristic corrugated phase is formed. Force-distance curve measurements reveal that the thickness of the corrugated phase is consistent with the thickness of a bilayer lipid membrane. The formation of the corrugated phase may be explained by considering the elastic properties of the film and taking into account spontaneous curvature induced by the asymmetric environment of the bilayer, in which one side faces the gold substrate and the other side faces the solution. The effect of temperature and electrode potential on the stability of the corrugated phase has also been described.
Collapse
Affiliation(s)
- Ming Li
- Department of Chemistry, University of Guelph, Guelph, Ontario, Canada
| | | | | | | | | | | | | | | |
Collapse
|
49
|
Lee HY, Lee BK, Park JW, Jung HS, Kim JM, Kawai T. Self-organized functional lipid vesicle array for sensitive immunoassay chip. Ultramicroscopy 2008; 108:1325-7. [DOI: 10.1016/j.ultramic.2008.04.089] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
50
|
Casuso I, Pla-Roca M, Gomila G, Samitier J, Minic J, Persuy MA, Salesse R, Pajot-Augy E. Immobilization of olfactory receptors onto gold electrodes for electrical biosensor. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2008. [DOI: 10.1016/j.msec.2007.10.011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|