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Clop EM, Corvalán NA, Perillo MA. Langmuir films of dipalmitoyl phosphatidylethanolamine grafted poly(ethylene glycol). In-situ evidence of surface aggregation at the air-water interface. Colloids Surf B Biointerfaces 2016; 148:640-649. [PMID: 27697738 DOI: 10.1016/j.colsurfb.2016.09.023] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2016] [Revised: 08/25/2016] [Accepted: 09/20/2016] [Indexed: 10/21/2022]
Abstract
The molecular packing-dependent interfacial organization of polyethylene glycol grafted dipalmitoylphosphatidylethanolamine (PE-PEGs) Langmuir films was studied. The PEG chains covered a wide molecular mass range (350, 1000 and 5000Da). In surface pressure-area (π-A), isotherms PE-PEG1000 and PE-PEG5000 showed transitions (midpoints at πm,t1∼11mN/m, "t1"), which appeared as a long non-horizontal line region. Thus, t1 cannot be considered a first-order phase transition but may reflect a transition within the polymer, comprising its desorption from the air-water interface and compaction upon compression. This is supported by the increase in the νs(C-O-C) PM-IRRAS signal intensity and the increasing surface potentials at maximal compression, which reflect thicker polymeric layers. Furthermore, changes in hydrocarbon chain (HC) packing and tilt with respect to the surface led to reorientation in the PO2- group upon compression, indicated by the inversion of the νasym(PO2-) PM-IRRAS signal around t1. The absence of a t1 in PE-PEG350 supports the requisite of a critical polymer chain length for this transition to occur. In-situ epifluorescence microscopy revealed 2D-domain-like structures in PE-PEG1000 and PE-PEG5000 around t1, possibly associated with gelation/dehydration of the polymeric layer and appearing at decreasing π as the polymeric tail became longer. Another transition, t2, appearing in PE-PEG350 and PE-PEG1000 at πm,t2=29.4 and 34.8mN/m, respectively, was associated with HC condensation and was impaired in PE-PEG5000 due to steric hindrance imposed by the large size of its polymer moiety. Two critical lengths of polymer chains were found, one of which allowed the onset of polymeric-tail gelation and the other limited HC compaction.
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Affiliation(s)
- Eduardo M Clop
- Instituto de Investigaciones Biológicas y Tecnológicas IIBYT (CONICET-UNC) Cátedra de Química Biológica, Depto de Química, FCEFyN, Universidad Nacional de Córdoba. Av. Vélez Sarsfield 1611, X 5016GCA Córdoba, Argentina
| | - Natalia A Corvalán
- Instituto de Investigaciones Biológicas y Tecnológicas IIBYT (CONICET-UNC) Cátedra de Química Biológica, Depto de Química, FCEFyN, Universidad Nacional de Córdoba. Av. Vélez Sarsfield 1611, X 5016GCA Córdoba, Argentina
| | - María A Perillo
- Instituto de Investigaciones Biológicas y Tecnológicas IIBYT (CONICET-UNC) Cátedra de Química Biológica, Depto de Química, FCEFyN, Universidad Nacional de Córdoba. Av. Vélez Sarsfield 1611, X 5016GCA Córdoba, Argentina.
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Cell adhesion and spreading at a charged interface: Insight into the mechanism using surface techniques and mathematical modelling. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2015.07.068] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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3
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Disalvo EA, Martini MF, Bouchet AM, Hollmann A, Frías MA. Structural and thermodynamic properties of water-membrane interphases: significance for peptide/membrane interactions. Adv Colloid Interface Sci 2014; 211:17-33. [PMID: 25085854 DOI: 10.1016/j.cis.2014.05.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2013] [Revised: 05/16/2014] [Accepted: 05/16/2014] [Indexed: 12/28/2022]
Abstract
Water appears as a common intermediary in the mechanisms of interaction of proteins and polypeptides with membranes of different lipid composition. In this review, how water modulates the interaction of peptides and proteins with lipid membranes is discussed by correlating the thermodynamic response and the structural changes of water at the membrane interphases. The thermodynamic properties of the lipid-protein interaction are governed by changes in the water activity of monolayers of different lipid composition according to the lateral surface pressure. In this context, different water populations can be characterized below and above the phase transition temperature in relation to the CH₂ conformers' states in the acyl chains. According to water species present at the interphase, lipid membrane acts as a water state regulator, which determines the interfacial water domains in the surface. It is proposed that those domains are formed by the contact between lipids themselves and between lipids and the water phase, which are needed to trigger adsorption-insertion processes. The water domains are essential to maintain functional dynamical properties and are formed by water beyond the hydration shell of the lipid head groups. These confined water domains probably carries information in local units in relation to the lipid composition thus accounting for the link between lipidomics and aquaomics. The analysis of these results contributes to a new insight of the lipid bilayer as a non-autonomous, responsive (reactive) structure that correlates with the dynamical properties of a living system.
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Affiliation(s)
- E A Disalvo
- Centro de Investigaciones y Transferencia Santiago del Estero (CITSE), (CONICET-UNSE), Laboratorio de Biointerfases y Sistemas Biomiméticos, Laboratorios Centrales - Ala Norte, Ruta Nacional 9, Km 1125 - Villa El Zanjón, CP 4206 Santiago del Estero, Argentina.
| | - M F Martini
- Department of Pharmaceutical Technology, Universidad de Buenos Aires, Buenos Aires, Argentina and CONICET
| | - A M Bouchet
- Centro de Investigaciones y Transferencia Santiago del Estero (CITSE), (CONICET-UNSE), Laboratorio de Biointerfases y Sistemas Biomiméticos, Laboratorios Centrales - Ala Norte, Ruta Nacional 9, Km 1125 - Villa El Zanjón, CP 4206 Santiago del Estero, Argentina
| | - A Hollmann
- Centro de Investigaciones y Transferencia Santiago del Estero (CITSE), (CONICET-UNSE), Laboratorio de Biointerfases y Sistemas Biomiméticos, Laboratorios Centrales - Ala Norte, Ruta Nacional 9, Km 1125 - Villa El Zanjón, CP 4206 Santiago del Estero, Argentina
| | - M A Frías
- Centro de Investigaciones y Transferencia Santiago del Estero (CITSE), (CONICET-UNSE), Laboratorio de Biointerfases y Sistemas Biomiméticos, Laboratorios Centrales - Ala Norte, Ruta Nacional 9, Km 1125 - Villa El Zanjón, CP 4206 Santiago del Estero, Argentina
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Water defects induced by expansion and electrical fields in DMPC and DMPE monolayers: Contribution of hydration and confined water. Colloids Surf B Biointerfaces 2013; 102:871-8. [DOI: 10.1016/j.colsurfb.2012.09.031] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2012] [Revised: 09/12/2012] [Accepted: 09/17/2012] [Indexed: 11/19/2022]
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5
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Herrera FE, Bouchet A, Lairion F, Disalvo EA, Pantano S. Molecular Dynamics Study of the Interaction of Arginine with Phosphatidylcholine and Phosphatidylethanolamine Bilayers. J Phys Chem B 2012; 116:4476-83. [DOI: 10.1021/jp2096357] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Fernando E. Herrera
- Institut Pasteur de Montevideo, Calle Mataojo 2020. CP 11400 Montevideo,
Uruguay
- Consejo Nacional
de Investigaciones
Científicas y Técnicas (CONICET), Departamento de Física,
Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, C.C. 242, Ciudad
Universitaria, C.P. S3000ZAA, Santa Fe, Argentina
| | - Ana Bouchet
- Laboratorio de Fisicoquímica
de Membranas Lipídicas, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956 2°P
(1113), Buenos Aires, Argentina
| | - Fabiana Lairion
- Laboratorio de Fisicoquímica
de Membranas Lipídicas, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956 2°P
(1113), Buenos Aires, Argentina
| | - E. Aníbal Disalvo
- Laboratorio de Fisicoquímica
de Membranas Lipídicas, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956 2°P
(1113), Buenos Aires, Argentina
| | - Sergio Pantano
- Institut Pasteur de Montevideo, Calle Mataojo 2020. CP 11400 Montevideo,
Uruguay
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6
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Nelson A. Electrochemistry of mercury supported phospholipid monolayers and bilayers. Curr Opin Colloid Interface Sci 2010. [DOI: 10.1016/j.cocis.2010.07.004] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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7
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Coldrick Z, Steenson P, Millner P, Davies M, Nelson A. Phospholipid monolayer coated microfabricated electrodes to model the interaction of molecules with biomembranes. Electrochim Acta 2009. [DOI: 10.1016/j.electacta.2009.02.095] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Bouchet A, Frías M, Lairion F, Martini F, Almaleck H, Gordillo G, Disalvo E. Structural and dynamical surface properties of phosphatidylethanolamine containing membranes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2009; 1788:918-25. [DOI: 10.1016/j.bbamem.2009.02.012] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2008] [Revised: 01/26/2009] [Accepted: 02/17/2009] [Indexed: 10/21/2022]
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Disalvo EA, Lairion F, Martini F, Tymczyszyn E, Frías M, Almaleck H, Gordillo GJ. Structural and functional properties of hydration and confined water in membrane interfaces. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2008; 1778:2655-70. [PMID: 18834854 DOI: 10.1016/j.bbamem.2008.08.025] [Citation(s) in RCA: 174] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2008] [Revised: 08/19/2008] [Accepted: 08/22/2008] [Indexed: 11/19/2022]
Abstract
The scope of the present review focuses on the interfacial properties of cell membranes that may establish a link between the membrane and the cytosolic components. We present evidences that the current view of the membrane as a barrier of permeability that contains an aqueous solution of macromolecules may be replaced by one in which the membrane plays a structural and functional role. Although this idea has been previously suggested, the present is the first systematic work that puts into relevance the relation water-membrane in terms of thermodynamic and structural properties of the interphases that cannot be ignored in the understanding of cell function. To pursue this aim, we introduce a new definition of interphase, in which the water is organized in different levels on the surface with different binding energies. Altogether determines the surface free energy necessary for the structural response to changes in the surrounding media. The physical chemical properties of this region are interpreted in terms of hydration water and confined water, which explain the interaction with proteins and could affect the modulation of enzyme activity. Information provided by several methodologies indicates that the organization of the hydration states is not restricted to the membrane plane albeit to a region extending into the cytoplasm, in which polar head groups play a relevant role. In addition, dynamic properties studied by cyclic voltammetry allow one to deduce the energetics of the conformational changes of the lipid head group in relation to the head-head interactions due to the presence of carbonyls and phosphates at the interphase. These groups are, apparently, surrounded by more than one layer of water molecules: a tightly bound shell, that mostly contributes to the dipole potential, and a second one that may be displaced by proteins and osmotic stress. Hydration water around carbonyl and phosphate groups may change by the presence of polyhydroxylated compounds or by changing the chemical groups esterified to the phosphates, mainly choline, ethanolamine or glycerol. Thus, surface membrane properties, such as the dipole potential and the surface pressure, are modulated by the water at the interphase region by changing the structure of the membrane components. An understanding of the properties of the structural water located at the hydration sites and the functional water confined around the polar head groups modulated by the hydrocarbon chains is helpful to interpret and analyze the consequences of water loss at the membranes of dehydrated cells. In this regard, a correlation between the effects of water activity on cell growth and the lipid composition is discussed in terms of the recovery of the cell volume and their viability. Critical analyses of the properties of water at the interface of lipid membranes merging from these results and others from the literature suggest that the interface links the membrane with the aqueous soluble proteins in a functional unit in which the cell may be considered as a complex structure stabilized by water rather than a water solution of macromolecules surrounded by a semi permeable barrier.
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Affiliation(s)
- E A Disalvo
- Laboratorio de Fisicoquímica de Membranas Lipídicas, Cátedra de Química General e Inorgánica, Departamento de Química Analítica y Fisicoquímica, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Buenos Aires, Argentina.
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Lairion F, Disalvo EA. Effect of arbutin on the dipole potential and area per lipid of ester and ether phosphatidylcholine and phosphatidyl ethanolamine monolayers. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2007; 1768:450-6. [PMID: 17257579 DOI: 10.1016/j.bbamem.2006.11.022] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2006] [Revised: 10/19/2006] [Accepted: 11/08/2006] [Indexed: 11/17/2022]
Abstract
The present results report for the first time a systematic study of the effect of arbutin on the dipole potential of lipid membranes. The dipole potential and the area per lipid were measured in monolayers of dimyristoylphosphatidylcholine (DMPC), 1,2-di-O-tetradecyl-sn-glycero-3-phosphocholine (dietherPC), dimyristoylphosphatidylethanolamine (DMPE) and 1,2-di-O-tetradecyl-sn-glycero-3-phosphoethanolamine (dietherPE), spread on aqueous solutions of different concentrations of arbutin. The decrease of the dipole potential of DMPC, both in condensed and expanded monolayers, is parallel to an increase in the area per lipid. In contrast, for dietherPC, the area per lipid is not affected, in spite of the fact that arbutin is also able to decrease the dipole potential in a less drastic extent. In the case of DMPE, the response is similar to that observed with dietherPC: the dipole potential decreases, while the area per lipid remains unchanged. However, when the carbonyl groups are absent in phosphatidylethanolamine derivatives such as the dietherPE, the dipole potential is not affected by arbutin, with a small decrease in the area. The effect of arbutin on the dipole potential differs from that of sucrose, trehalose and phloretin and is congruent with previous results obtained by FTIR on its interaction with the CO groups. Arbutin binding is interpreted in terms of the exposure to water of the phosphate and carbonyl groups at the membrane interface of the different monolayers.
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Affiliation(s)
- Fabiana Lairion
- Laboratorio de Fisicoquímica de Membranas Lipídicas y Liposomas, Cátedra de Química General e Inorgánica, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956 20 Piso (1113), Capital Federal, Argentina
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