1
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Cámara CI, Crosio MA, Juarez AV, Wilke N. Dexamethasone and Dexamethasone Phosphate: Effect on DMPC Membrane Models. Pharmaceutics 2023; 15:pharmaceutics15030844. [PMID: 36986705 PMCID: PMC10053563 DOI: 10.3390/pharmaceutics15030844] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Revised: 02/23/2023] [Accepted: 03/01/2023] [Indexed: 03/08/2023] Open
Abstract
Dexamethasone (Dex) and Dexamethasone phosphate (Dex-P) are synthetic glucocorticoids with high anti-inflammatory and immunosuppressive actions that gained visibility because they reduce the mortality in critical patients with COVID-19 connected to assisted breathing. They have been widely used for the treatment of several diseases and in patients under chronic treatments, thus, it is important to understand their interaction with membranes, the first barrier when these drugs get into the body. Here, the effect of Dex and Dex-P on dimyiristoylphophatidylcholine (DMPC) membranes were studied using Langmuir films and vesicles. Our results indicate that the presence of Dex in DMPC monolayers makes them more compressible and less reflective, induces the appearance of aggregates, and suppresses the Liquid Expanded/Liquid Condensed (LE/LC) phase transition. The phosphorylated drug, Dex-P, also induces the formation of aggregates in DMPC/Dex-P films, but without disturbing the LE/LC phase transition and reflectivity. Insertion experiments demonstrate that Dex induces larger changes in surface pressure than Dex-P, due to its higher hydrophobic character. Both drugs can penetrate membranes at high lipid packings. Vesicle shape fluctuation analysis shows that Dex-P adsorption on GUVs of DMPC decreases membrane deformability. In conclusion, both drugs can penetrate and alter the mechanical properties of DMPC membranes.
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Affiliation(s)
- Candelaria Ines Cámara
- Departamento de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba X5000HUA, Argentina
- Instituto de Investigaciones en Fisicoquímica de Córdoba (INFIQC), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Córdoba X5000HUA, Argentina
- Correspondence: ; Tel.: +54-9-351-5353570
| | - Matías Ariel Crosio
- Departamento de Química Biológica Ranwel Caputto, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba X5000HUA, Argentina
- Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Córdoba X5000HUA, Argentina
| | - Ana Valeria Juarez
- Departamento de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba X5000HUA, Argentina
- Instituto de Investigaciones en Fisicoquímica de Córdoba (INFIQC), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Córdoba X5000HUA, Argentina
| | - Natalia Wilke
- Departamento de Química Biológica Ranwel Caputto, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba X5000HUA, Argentina
- Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Córdoba X5000HUA, Argentina
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2
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Hermet M, Yanis Espinosa R, Elisa Fait M, Yenisleidy de las Zulueta Díaz M, Morcelle S, Laura Bakás S, Ariel Alvarez H, Laura Fanani M. Arginine-based surfactants alter the rheological and in-plane structural properties of stratum corneum model membranes. J Colloid Interface Sci 2022; 631:224-238. [DOI: 10.1016/j.jcis.2022.10.118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Revised: 10/17/2022] [Accepted: 10/22/2022] [Indexed: 11/07/2022]
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3
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4
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Lateral organization of biomimetic cell membranes in varying pH conditions. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.117907] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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5
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Caruso B, Wilke N, Perillo MA. Triglyceride Lenses at the Air-Water Interface as a Model System for Studying the Initial Stage in the Biogenesis of Lipid Droplets. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:10958-10970. [PMID: 34491757 DOI: 10.1021/acs.langmuir.1c01359] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Lipid droplets (LD) are intracellular structures consisting of an apolar lipid core, composed mainly of triglycerides (TG) and steryl esters, coated by a lipid-protein mixed monolayer. The mechanisms underlying LD biogenesis at the endoplasmic reticulum membrane are a matter of many current investigations. Although models explaining the budding-off of protuberances of phase-segregated TG inside bilayers have been proposed recently, the assumption of such initial blisters needs further empirical support. Here, we study mixtures of egg phosphatidylcholine (EPC) and TG at the air-water interface in order to describe some physical properties and topographic stability of TG bulk structures in contact with interfaces. Brewster angle microscopy images revealed the appearance of microscopic collapsed structures (CS) with highly reproducible lateral size (∼1 μm lateral radius) not varying with lateral packing changes and being highly stable at surface pressures (π) beyond collapse. By surface spectral fluorescence microscopy, we were able to characterize the solvatochromism of Nile Red both in monolayers and inside CS. This allowed to conclude that CS corresponded to a phase of liquid TG and to characterize them as lenses forming a three-phase (oil-water-air) system. Thereby, the thicknesses of the lenses could be determined, observing that they were dramatically flattened when EPC was present (6-12 nm compared to 30-50 nm for lenses on EPC/TG and TG films, respectively). Considering the shape of lenses, the interfacial tensions, and the Neumann's triangle, this experimental approach allows one to estimate the oil-water interfacial tension acting at each individual microscopic lens and at varying compression states of the surrounding monolayer. Thus, lenses formed on air-water Langmuir films can serve to assess variables of relevance to the initial step of LD biogenesis, such as the degree of dispersion of excluded-TG phase and shape, spatial distribution, and oil-water interfacial tension of lenses.
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Affiliation(s)
- B Caruso
- Facultad de Ciencias Exactas, Físicas y Naturales. Departamento de Química, Cátedra de Química BiológicaUniversidad Nacional de Córdoba, X5016GCA Córdoba, Argentina
- Instituto de Investigaciones Biológicas y Tecnológicas (IIByT), CONICET, X5016GCA Córdoba, Argentina
| | - N Wilke
- Facultad de Ciencias Químicas,. Departamento de Química Biológica Ranwel Caputto, Universidad Nacional de Córdoba, X5016GCA Córdoba, Argentina
- Centro de Investigaciones en Quimica Biológica de Córdoba (CIQUIBIC), CONICET, X5016GCA Córdoba, Argentina
| | - M A Perillo
- Facultad de Ciencias Exactas, Físicas y Naturales. Departamento de Química, Cátedra de Química BiológicaUniversidad Nacional de Córdoba, X5016GCA Córdoba, Argentina
- Instituto de Investigaciones Biológicas y Tecnológicas (IIByT), CONICET, X5016GCA Córdoba, Argentina
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6
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Galassi VV, Wilke N. On the Coupling between Mechanical Properties and Electrostatics in Biological Membranes. MEMBRANES 2021; 11:478. [PMID: 34203412 PMCID: PMC8306103 DOI: 10.3390/membranes11070478] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Revised: 06/18/2021] [Accepted: 06/22/2021] [Indexed: 12/24/2022]
Abstract
Cell membrane structure is proposed as a lipid matrix with embedded proteins, and thus, their emerging mechanical and electrostatic properties are commanded by lipid behavior and their interconnection with the included and absorbed proteins, cytoskeleton, extracellular matrix and ionic media. Structures formed by lipids are soft, dynamic and viscoelastic, and their properties depend on the lipid composition and on the general conditions, such as temperature, pH, ionic strength and electrostatic potentials. The dielectric constant of the apolar region of the lipid bilayer contrasts with that of the polar region, which also differs from the aqueous milieu, and these changes happen in the nanometer scale. Besides, an important percentage of the lipids are anionic, and the rest are dipoles or higher multipoles, and the polar regions are highly hydrated, with these water molecules forming an active part of the membrane. Therefore, electric fields (both, internal and external) affects membrane thickness, density, tension and curvature, and conversely, mechanical deformations modify membrane electrostatics. As a consequence, interfacial electrostatics appears as a highly important parameter, affecting the membrane properties in general and mechanical features in particular. In this review we focus on the electromechanical behavior of lipid and cell membranes, the physicochemical origin and the biological implications, with emphasis in signal propagation in nerve cells.
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Affiliation(s)
- Vanesa Viviana Galassi
- Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Cuyo, Mendoza M5500, Argentina;
- Instituto Interdisciplinario de Ciencias Básicas (ICB), Universidad Nacional de Cuyo, CONICET, Mendoza M5500, Argentina
| | - Natalia Wilke
- Departamento de Química Biológica Ranwel Caputto, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba X5000HUA, Argentina
- Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC), Universidad Nacional de Córdoba, CONICET, Córdoba X5000HUA, Argentina
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7
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Peppino Margutti M, Wilke N, Villasuso AL. Influence of Ca 2+ on the surface behavior of phosphatidic acid and its mixture with diacylglycerol pyrophosphate at different pHs. Chem Phys Lipids 2020; 228:104887. [PMID: 32027867 DOI: 10.1016/j.chemphyslip.2020.104887] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Revised: 12/13/2019] [Accepted: 01/30/2020] [Indexed: 01/13/2023]
Abstract
The signaling lipids phosphatidic acid (PA) and diacylglycerol pyrophosphate (DGPP) are involved in regulating the stress response in plants. PA and DGPP are anionic lipids consisting of a negatively charged phosphomonoester or pyrophosphate group attached to diacylglycerol, respectively. Changes in the pH modulate the protonation of their head groups modifying the interaction with other effectors. Here, we examine in a controlled system how the presence of Ca2+ modulates the surface organization of dioleyl diacylglycerol pyrophosphate (DGPP) and its interaction with dioleoyl phosphatidic acid (DOPA) at different pHs. Both lipids formed expanded monolayers at pH 5 and 8. At acid and basic pHs, monolayers formed by DOPA or DGPP became denser when Ca2+ was added to the subphase. At pH 5, Ca2+ also induced an increase of surface potential of both lipids. Conversely, at pH 8 the effects induced by the presence of Ca2+ on the surface potential were reversed. Mixed monolayers of DOPA and DGPP showed a non-ideal behavior. The addition of even tiny amounts of DGPP to DOPA films caused a reduction of the mean molecular area. This effect was more evident at pH 8 compared to pH 5. Our finding suggests that low amounts of DGPP in an film enriched in DOPA could lead to a local increase in film packing with a concomitant change in the local polarization, further regulated by local pH. This fact may have implications for the assigned role of PA as a pH-sensing phospholipid or during its interaction with proteins.
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Affiliation(s)
- Micaela Peppino Margutti
- Universidad Nacional de Río Cuarto, FCEFQyN, Departamento de Biología Molecular, Río Cuarto, Argentina
| | - Natalia Wilke
- Universidad Nacional de Córdoba, Facultad de Ciencias Químicas, Departamento de Química Biológica Ranwel Caputto, Córdoba, Argentina; CONICET, Universidad Nacional de Córdoba, Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC), Córdoba, Argentina
| | - Ana Laura Villasuso
- Universidad Nacional de Río Cuarto, FCEFQyN, Departamento de Biología Molecular, Río Cuarto, Argentina; CONICET, Universidad Nacional de Río Cuarto, Instituto de Biotecnologia Ambiental y Salud, (INBIAS), Río Cuarto, Argentina.
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8
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Arias J, Díaz S, Ben Altabef A, Dupuy F. Interaction of cysteine and its derivatives with monolayers of dipalmitoylphosphatidylcholine. Colloids Surf B Biointerfaces 2019; 184:110548. [DOI: 10.1016/j.colsurfb.2019.110548] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Revised: 08/16/2019] [Accepted: 10/02/2019] [Indexed: 12/18/2022]
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9
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Dogra N, Balaraman RP, Kohli P. Chemically Engineered Synthetic Lipid Vesicles for Sensing and Visualization of Protein-Bilayer Interactions. Bioconjug Chem 2019; 30:2136-2149. [PMID: 31314501 DOI: 10.1021/acs.bioconjchem.9b00366] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
From pathogen intrusion to immune response, the cell membrane plays an important role in signal transduction. Such signals are important for cellular proliferation and survival. However, measurement of these subtle signals through the lipid membrane scaffold is challenging. We present a chromatic model membrane vesicle system engineered to covalently bind with lysine residues of protein molecules for investigation of cellular interactions and signaling. We discovered that different protein molecules induced differential spectroscopic signals, which is based on the chemical and physical properties of protein interacting at the vesicle surface. The observed chromatic response (CR) for bound protein molecules with higher molecular weight was much larger (∼5-15×) than those for low molecular weight proteins. Through mass spectrometry (MS), we found that only 6 out of 60 (10%) lysine groups present in bovine serum albumin (BSA) were accessible to the membrane of the vesicles. Finally, a "sphere-shell" model representing the protein-vesicle complex was used for evaluating the contribution of van der Waals interactions between proteins and vesicles. Our analysis points to contributions from van der Waals, hydrophobic, and electrostatic interactions toward observed CR signals resulting from molecular interactions at the vesicle membrane surface. Overall, this study provided a convenient, chromatic, semiquantitative method of detecting biomolecules and their interactions with model membranes at sub-nanomolar concentration.
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Affiliation(s)
- Navneet Dogra
- Department of Chemistry and Biochemistry , Southern Illinois University , Carbondale , Illinois 62901 , United States.,IBM T. J. Watson Research Center , Yorktown Heights , New York 10058 , United States.,Department of Genetics and Genomic Sciences , Icahn School of Medicine at Mount Sinai , New York , New York 10029 , United States
| | - Rajesh P Balaraman
- Department of Chemistry and Biochemistry , Southern Illinois University , Carbondale , Illinois 62901 , United States
| | - Punit Kohli
- Department of Chemistry and Biochemistry , Southern Illinois University , Carbondale , Illinois 62901 , United States
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10
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Cheng V, Kimball DR, Conboy DJC. Determination of the Rate-Limiting Step in Fatty Acid Transport. J Phys Chem B 2019; 123:7157-7168. [DOI: 10.1021/acs.jpcb.9b05162] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Victoria Cheng
- Department of Chemistry, University of Utah, 315 South 1400 East, RM 2020, Salt Lake City, Utah 84112, United States
| | - Dylan R. Kimball
- Department of Chemistry, University of Utah, 315 South 1400 East, RM 2020, Salt Lake City, Utah 84112, United States
| | - Dr. John C. Conboy
- Department of Chemistry, University of Utah, 315 South 1400 East, RM 2020, Salt Lake City, Utah 84112, United States
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11
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Viada B, Cámara CI, Yudi LM. Destabilizing effect of perfluorodecanoic acid on simple membrane models. SOFT MATTER 2019; 15:2447-2462. [PMID: 30801603 DOI: 10.1039/c8sm02301h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Perfluoroalkyl acids (PFA) are amphiphilic surfactants widely used in industry with several commercial applications. An important feature of these compounds is their non-biodegradability and their tendency to bio-accumulate in the environment, which has led to these compounds being considered among the most persistent pollutants worldwide. Many studies have provided evidence of their toxic effect on humans and wildlife. For this reason, more and more efforts have been made to better understand the effect of these compounds on living organisms. The aim of the present study is to understand how the electrostatic interactions and film compactness of biological membrane models modulate their interaction with PFA, more specifically with perfluorodecanoic acid (PFD). Langmuir isotherms and Brewster angle microscopy (BAM) are used to evaluate the effect of PFD on lipid membrane models (air/water monolayers and vesicles), analyzing the behavior of PFD : lipid mixtures. The lipids used in this study are distearoyl phosphatidic acid (DSPA), dilauroyl phosphatidic acid (DLPA) and distearoyl phosphatidylethanolamine (DSPE). PFD induces an increase in the mean molecular area per lipid in monolayers, mainly at lower surface pressures. BAM images demonstrate that PFD mixes with DLPA, inducing a decrease in gray level, while it forms a non-miscible mixture with DSPA, segregating PFD domains. Insertion studies of PFD within monolayers and dynamic light scattering experiments demonstrate that PFD can penetrate into monolayers and bilayers above 30 mN m-1, which is the lateral pressure value accepted for a cellular bilayer.
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Affiliation(s)
- Benjamin Viada
- Universidad Nacional de Córdoba, Facultad de Ciencias Químicas, Departamento de Fisicoquímica, Córdoba, Argentina.
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12
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Mottola M, Caruso B, Perillo MA. Langmuir films at the oil/water interface revisited. Sci Rep 2019; 9:2259. [PMID: 30783164 PMCID: PMC6381208 DOI: 10.1038/s41598-019-38674-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Accepted: 01/07/2019] [Indexed: 11/09/2022] Open
Abstract
We studied monomolecular layers at the oil/water interface (O/Wint) in a Langmuir interfacial trough using egg-yolk phosphatidylcholine (EPC) (the model phospholipid) and Vaseline (VAS) as oil phase. The temporal dynamics in the surface pressure (π) evolution depended on the method (spreading/adsorption) used for monolayers preparation and reflected the different distribution of EPC between all the system compartments (bulk phases and interfaces). We distinguished between EPC located either stable at the interface or hopping between the interface and bulk phases. The size order of the apparent mean molecular area, at constant π, of EPC at different interfaces (EPCO/W > EPC/VAS0.02;A/W > EPCA/W), suggested that VAS molecules intercalated between the hydrocarbon chains of EPCO/W, at a molar fraction xVAS > 0.02. However, EPC/VAS0.02;A/W showed the highest compressional free energy. This leaded us to study the EPC/VAS0.02 mixture at A/W by Brewster Angle Microscopy (BAM), finding that upon compression VAS segregated over the monolayer, forming non-coalescent lenses (as predicted by the spreading coefficient S = −13 mN/m) that remained after decompression and whose height changed (increase/decrease) accompanied the compression/decompression cycle. At the O/Wint, while some VAS molecules remained at the interface up to the collapse, others squeezed out towards the VAS bulk phase with an energy requirement lower than towards the air.
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Affiliation(s)
- Milagro Mottola
- Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Depto. de Química, Cátedra de Química Biológica. Córdoba, Argentina. Av. Vélez Sarsfield 1611, X5016GCA, Córdoba, Argentina.,CONICET, Instituto de Investigaciones Biológicas y Tecnológicas (IIBYT). Córdoba, Argentina. Av. Vélez Sarsfield 1611, 5016, Córdoba, Argentina
| | - Benjamín Caruso
- Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Depto. de Química, Cátedra de Química Biológica. Córdoba, Argentina. Av. Vélez Sarsfield 1611, X5016GCA, Córdoba, Argentina.,CONICET, Instituto de Investigaciones Biológicas y Tecnológicas (IIBYT). Córdoba, Argentina. Av. Vélez Sarsfield 1611, 5016, Córdoba, Argentina
| | - Maria A Perillo
- Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Depto. de Química, Cátedra de Química Biológica. Córdoba, Argentina. Av. Vélez Sarsfield 1611, X5016GCA, Córdoba, Argentina. .,CONICET, Instituto de Investigaciones Biológicas y Tecnológicas (IIBYT). Córdoba, Argentina. Av. Vélez Sarsfield 1611, 5016, Córdoba, Argentina.
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13
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Cámara C, Lurgo FE, Fanani ML, Wilke N. Mechanical Stability of Lipid Membranes Decorated with Dextran Sulfate. ACS OMEGA 2018; 3:11673-11683. [PMID: 31459263 PMCID: PMC6645315 DOI: 10.1021/acsomega.8b01537] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/04/2018] [Accepted: 09/10/2018] [Indexed: 06/10/2023]
Abstract
Lipid vesicles decorated with polysaccharides have been proposed as vehicles for drug delivery because the polymers confer to the vesicles an enhanced stability, increasing the probability of the drug for reaching the target cell. Here, we first test the affinity of dextran sulfate (DS) for two different vesicle composition, and afterward, we study the effect of DS on the liposome mechanical properties. We found that DS binds to both tested membrane compositions. The interaction of DS with the anionic membranes studied here is mediated by the metal ions present in the aqueous solution (Na+ and Ca2+), being higher in the presence of Ca2+. Binding occurs preferentially in regions of closely packed lipids. Strikingly, DS did not affect the stability against detergent and the membrane rigidity of none of the vesicles. Thus, the proposed stability increase induced by this kind of polymers in drug delivery systems is not related with a modulation of the membrane thermodynamic properties but to other biochemical factors.
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Affiliation(s)
- Candelaria
I. Cámara
- Facultad
de Ciencias Químicas, Departamento de Química Biológica
Ranwel Caputto, Ciudad Universitaria, Universidad
Nacional de Córdoba, X5000HUA Córdoba, Argentina
- Centro
de Investigaciones en Química Biológica de Córdoba
(CIQUIBIC), Ciudad Universitaria, CONICET,
Universidad Nacional de Córdoba, X5000HUA Córdoba, Argentina
| | - Florencia E. Lurgo
- Facultad
de Ciencias Químicas, Departamento de Química Biológica
Ranwel Caputto, Ciudad Universitaria, Universidad
Nacional de Córdoba, X5000HUA Córdoba, Argentina
- Centro
de Investigaciones en Química Biológica de Córdoba
(CIQUIBIC), Ciudad Universitaria, CONICET,
Universidad Nacional de Córdoba, X5000HUA Córdoba, Argentina
| | - Maria Laura Fanani
- Facultad
de Ciencias Químicas, Departamento de Química Biológica
Ranwel Caputto, Ciudad Universitaria, Universidad
Nacional de Córdoba, X5000HUA Córdoba, Argentina
- Centro
de Investigaciones en Química Biológica de Córdoba
(CIQUIBIC), Ciudad Universitaria, CONICET,
Universidad Nacional de Córdoba, X5000HUA Córdoba, Argentina
| | - Natalia Wilke
- Facultad
de Ciencias Químicas, Departamento de Química Biológica
Ranwel Caputto, Ciudad Universitaria, Universidad
Nacional de Córdoba, X5000HUA Córdoba, Argentina
- Centro
de Investigaciones en Química Biológica de Córdoba
(CIQUIBIC), Ciudad Universitaria, CONICET,
Universidad Nacional de Córdoba, X5000HUA Córdoba, Argentina
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14
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Gonçalves da Silva AMPS. Interaction of Hydrophobic Ionic Liquids with Lipids in Langmuir Monolayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:3797-3805. [PMID: 29518336 DOI: 10.1021/acs.langmuir.7b04164] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The interaction of two ionic liquids, trihexyl(tetradecyl)phosphonium bis(trifluoromethylsulfonyl)-imide and trihexyl(tetradecyl)phosphonium dicyanamide, [P6 6 6 14][Ntf2] and [P6 6 6 14]/[N(CN)2], with several long-chained lipids with a different net charge at the hydrophilic group, a cationic surfactant, dioctadecyldimethylammonium bromide (DODAB), a zwitterionic phospholipid (DPPC), an anionic phospholipid (DPPG), and the neutral stearic acid (SA), was investigated at the air-water interface using the Langmuir trough technique. The experimental surface pressure-area (π- A) isotherms obtained for selected compositions of each binary system reveal distinct interfacial behavior. The degree and the nature of the IL-lipid interaction strongly depend on the charge distribution in the lipid polar group. Miscibility, or immiscibility, at the monolayer was inferred from the comparison of the experimental π- A isotherm with the theoretical curve calculated for the corresponding ideal mixture based on the π- A isotherms of the pure components. Phase separation and partial miscibility occurred in IL/DODAB and IL/DPPC systems, respectively. In both the IL/DPPG and the IL/SA systems, a new catanionic complex was found. For the IL/SA system, the catanionic complex formation varies with the subphase pH.
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15
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Via MA, Del Pópolo MG, Wilke N. Negative Dipole Potentials and Carboxylic Polar Head Groups Foster the Insertion of Cell-Penetrating Peptides into Lipid Monolayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:3102-3111. [PMID: 29394073 DOI: 10.1021/acs.langmuir.7b04038] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Cell-penetrating peptides (CPPs) are polycationic sequences of amino acids recognized as some of the most effective vehicles for delivering membrane-impermeable cargos into cells. CPPs can traverse cell membranes by direct translocation, and assessing the role of lipids on the membrane permeation process is important to convene a complete model of the CPP translocation. In this work, we focus on the biophysical basis of peptide-fatty acid interactions, analyzing how the acid-base and electrostatic properties of the lipids determine the CPP adsorption and incorporation into a Langmuir monolayer, focusing thus on the first two stages of the direct translocation mechanism. We sense the binding and insertion of the peptide into the lipid structure by measuring the changes in the surface pressure, the surface potential, and the reflectivity of the interface. We show that, beyond the presence of anionic moieties, negative dipole potentials and carboxylic polar head groups significantly promote the insertion of the peptide into the monolayer. On the basis of our results, we propose the appearance of stable CPP-lipid complexes whose kinetics of formation depends on the length of the lipids' hydrocarbon chains.
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Affiliation(s)
- Matías A Via
- CONICET & Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Cuyo, Mendoza , Argentina
- Instituto de Histologı́a y Embriologı́a de Mendoza (IHEM-CONICET) & Facultad de Ciencias Médicas, Universidad Nacional de Cuyo, Argentina
| | - Mario G Del Pópolo
- CONICET & Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Cuyo, Mendoza , Argentina
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16
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Alvares DS, Viegas TG, Ruggiero Neto J. Lipid-packing perturbation of model membranes by pH-responsive antimicrobial peptides. Biophys Rev 2017; 9:669-682. [PMID: 28853007 PMCID: PMC5662038 DOI: 10.1007/s12551-017-0296-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2017] [Accepted: 07/27/2017] [Indexed: 12/21/2022] Open
Abstract
The indiscriminate use of conventional antibiotics is leading to an increase in the number of resistant bacterial strains, motivating the search for new compounds to overcome this challenging problem. Antimicrobial peptides, acting only in the lipid phase of membranes without requiring specific membrane receptors as do conventional antibiotics, have shown great potential as possible substituents of these drugs. These peptides are in general rich in basic and hydrophobic residues forming an amphipathic structure when in contact with membranes. The outer leaflet of the prokaryotic cell membrane is rich in anionic lipids, while the surface of the eukaryotic cell is zwitterionic. Due to their positive net charge, many of these peptides are selective to the prokaryotic membrane. Notwithstanding this preference for anionic membranes, some of them can also act on neutral ones, hampering their therapeutic use. In addition to the electrostatic interaction driving peptide adsorption by the membrane, the ability of the peptide to perturb lipid packing is of paramount importance in their capacity to induce cell lysis, which is strongly dependent on electrostatic and hydrophobic interactions. In the present research, we revised the adsorption of antimicrobial peptides by model membranes as well as the perturbation that they induce in lipid packing. In particular, we focused on some peptides that have simultaneously acidic and basic residues. The net charges of these peptides are modulated by pH changes and the lipid composition of model membranes. We discuss the experimental approaches used to explore these aspects of lipid membranes using lipid vesicles and lipid monolayer as model membranes.
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Affiliation(s)
- Dayane S Alvares
- Department of Physics, UNESP - São Paulo State University, IBILCE, R. Cristóvão Colombo, 2265, São José do Rio Preto, SP, CEP 15054-000, Brazil
| | - Taisa Giordano Viegas
- Department of Physics, UNESP - São Paulo State University, IBILCE, R. Cristóvão Colombo, 2265, São José do Rio Preto, SP, CEP 15054-000, Brazil
| | - João Ruggiero Neto
- Department of Physics, UNESP - São Paulo State University, IBILCE, R. Cristóvão Colombo, 2265, São José do Rio Preto, SP, CEP 15054-000, Brazil.
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17
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Alvares DS, Wilke N, Ruggiero Neto J, Fanani ML. The insertion of Polybia-MP1 peptide into phospholipid monolayers is regulated by its anionic nature and phase state. Chem Phys Lipids 2017; 207:38-48. [PMID: 28802697 DOI: 10.1016/j.chemphyslip.2017.08.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Revised: 07/30/2017] [Accepted: 08/05/2017] [Indexed: 02/06/2023]
Abstract
Polybia-MP1 or simply MP1 (IDWKKLLDAAKQIL-NH2) is a peptide with broad-spectrum bactericidal activity and a strong inhibitory effect against cancer cells. The aim of this work was to evaluate the effect of biophysical properties such as membrane texture and film thickness on MP1 interaction with neutral and anionic lipid membranes. For this purpose, we first explored the peptide's surface behavior. MP1 showed high surface activity, adsorbing onto bare air/aqueous interfaces up to higher surface pressures than the collapse pressure of MP1 Langmuir films. The MP1-lipid membrane interaction was studied using Langmuir phosphatidylcholine and phosphatidylserine (PS) monolayers as model membrane systems. PS was chosen since this negatively charged lipid was found predominantly on the outer leaflet of tumor cells, and it enhances MP1 activity for PS-containing membranes to a greater extent than for other negatively charged lipids. MP1 incorporated into anionic PS monolayers, which show a liquid-expanded (LE) phase or LE-liquid-condensed (LC) phase coexistence, up to lipid-packing densities higher than those of cell membranes. The mixed lipid/MP1 films were explored by Brewster angle microscopy and atomic force microscopy. MP1 partitioned preferentially into the LE phase state of PS films, and were thus excluded from the coexisting LC phase. This interaction had strong electrostatic bases: in pure water, the lipid-peptide interaction was strong enough to induce formation of reversible lipid-peptide 3D structures associated with the interface. MP1 incorporation into the LE phase was accompanied by a shift of the phase transition pressure to higher values and a thinning of the lipid film. These results showed a clear correlation between peptide penetration capacity and the presence or induction of the thin LE phase. This capacity to regulate membrane physical properties may be of relevance in the binding, incorporation and membrane selectivity of this promising antitumor peptide.
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Affiliation(s)
- Dayane S Alvares
- UNESP - São Paulo State University, IBILCE, Department of Physics, São José do Rio Preto, SP, Brazil
| | - Natalia Wilke
- Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC-CONICET), Departamento de Química Biológica, Facultas de Ciencias Químicas, Universidad Nacional de Córdoba, Argentina
| | - João Ruggiero Neto
- UNESP - São Paulo State University, IBILCE, Department of Physics, São José do Rio Preto, SP, Brazil.
| | - Maria Laura Fanani
- Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC-CONICET), Departamento de Química Biológica, Facultas de Ciencias Químicas, Universidad Nacional de Córdoba, Argentina.
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18
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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.
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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.
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19
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Cámara CI, Riva JS, Juárez AV, Yudi LM. Interaction of chitosan and self-assembled distearoylphosphatidic acid molecules at liquid/liquid and air/water interfaces. Effect of temperature. J PHYS ORG CHEM 2016. [DOI: 10.1002/poc.3642] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Candelaria I. Cámara
- Instituto de Investigaciones en Fisicoquímica de Córdoba (INFIQC- CONICET). Departamento de Fisicoquímica, Facultad de Ciencias Químicas; Universidad Nacional de Córdoba; Ala 1, Pabellón Argentina, Ciudad Universitaria 5000 Córdoba Argentina
| | - Julieta S. Riva
- Instituto de Investigaciones en Fisicoquímica de Córdoba (INFIQC- CONICET). Departamento de Fisicoquímica, Facultad de Ciencias Químicas; Universidad Nacional de Córdoba; Ala 1, Pabellón Argentina, Ciudad Universitaria 5000 Córdoba Argentina
| | - Ana V. Juárez
- Instituto de Investigaciones en Fisicoquímica de Córdoba (INFIQC- CONICET). Departamento de Fisicoquímica, Facultad de Ciencias Químicas; Universidad Nacional de Córdoba; Ala 1, Pabellón Argentina, Ciudad Universitaria 5000 Córdoba Argentina
| | - Lidia M. Yudi
- Instituto de Investigaciones en Fisicoquímica de Córdoba (INFIQC- CONICET). Departamento de Fisicoquímica, Facultad de Ciencias Químicas; Universidad Nacional de Córdoba; Ala 1, Pabellón Argentina, Ciudad Universitaria 5000 Córdoba Argentina
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20
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Zhang T, Cathcart MG, Vidalis AS, Allen HC. Cation effects on phosphatidic acid monolayers at various pH conditions. Chem Phys Lipids 2016; 200:24-31. [DOI: 10.1016/j.chemphyslip.2016.06.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2015] [Revised: 05/11/2016] [Accepted: 06/01/2016] [Indexed: 11/29/2022]
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21
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Prime EL, Solomon DH, Dagley IJ, Qiao GG. Duolayers at the Air/Water Interface: Improved Lifetime through Ionic Interactions. J Phys Chem B 2016; 120:7401-7. [PMID: 27420341 DOI: 10.1021/acs.jpcb.6b04273] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Ionic interactions to stabilize Langmuir films at the air/water interface have been used to develop improved duolayer films. Two-component mixtures of octadecanoic (stearic) acid and poly(diallyldimethylammonium chloride) (polyDADMAC) with different ratios were prepared and applied to the water surface. Surface pressure isotherm cycles demonstrated a significant improvement in film stability with the inclusion of the polymer. Viscoelastic properties were measured using canal viscometry and oscillating barriers, with both methods showing that the optimum ratio for improved properties was four octadecanoic acid molecules to one DADMAC unit (1:0.25). At this ratio it is expected multiple strong ionic interactions are formed along each polymer chain. Brewster angle microscopy showed decreased domain size with increased ratios of polyDADMAC, indicating that the polymer is interspersed across the surface. This new method to stabilize and increase the viscoelastic properties of charged monolayer films, using a premixed composition, will have application in areas such as water evaporation mitigation, optical devices, and foaming.
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Affiliation(s)
- Emma L Prime
- Department of Chemical & Biomolecular Engineering, University of Melbourne , Parkville, VIC 3010, Australia
| | - David H Solomon
- Department of Chemical & Biomolecular Engineering, University of Melbourne , Parkville, VIC 3010, Australia
| | - Ian J Dagley
- Cooperative Research Centre for Polymers, 8 Redwood Drive, Notting Hill, VIC 3168, Australia
| | - Greg G Qiao
- Department of Chemical & Biomolecular Engineering, University of Melbourne , Parkville, VIC 3010, Australia
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22
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The interfacial properties of the peptide Polybia-MP1 and its interaction with DPPC are modulated by lateral electrostatic attractions. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2016; 1858:393-402. [DOI: 10.1016/j.bbamem.2015.12.010] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2015] [Revised: 11/16/2015] [Accepted: 12/04/2015] [Indexed: 11/18/2022]
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23
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Díaz YDLMZ, Mottola M, Vico RV, Wilke N, Fanani ML. The Rheological Properties of Lipid Monolayers Modulate the Incorporation of l-Ascorbic Acid Alkyl Esters. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:587-95. [PMID: 26694518 DOI: 10.1021/acs.langmuir.5b04175] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
In this work, we tested the hypothesis that the incorporation of amphiphilic drugs into lipid membranes may be regulated by their rheological properties. For this purpose, two members of the l-ascorbic acid alkyl esters family (ASCn) were selected, ASC16 and ASC14, which have different rheological properties when organized at the air/water interface. They are lipophilic forms of vitamin C used in topical pharmacological preparations. The effect of the phase state of the host lipid membranes on ASCn incorporation was explored using Langmuir monolayers. Films of pure lipids with known phase states have been selected, showing liquid-expanded, liquid-condensed, and solid phases as well as pure cholesterol films in liquid-ordered state. We also tested ternary and quaternary mixed films that mimic the properties of cholesterol containing membranes and of the stratum corneum. The compressibility and shear properties of those monolayers were assessed in order to define its phase character. We found that the length of the acyl chain of the ASCn compounds induces differential changes in the rheological properties of the host membrane and subtly regulates the kinetics and extent of the penetration process. The capacity for ASCn uptake was found to depend on the phase state of the host film. The increase in surface pressure resultant after amphiphile incorporation appears to be a function of the capacity of the host membrane to incorporate such amphiphile as well as the rheological response of the film. Hence, monolayers that show a solid phase state responded with a larger surface pressure increase to the incorporation of a comparable amount of amphiphile than liquid-expanded ones. The cholesterol-containing films, including the mixture that mimics stratum corneum, allowed a very scarce ASCn uptake independently of the membrane diffusional properties. This suggests an important contribution of Cho on the maintenance of the barrier function of stratum corneum.
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Affiliation(s)
- Yenisleidy de Las Mercedes Zulueta Díaz
- Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC-CONICET), Departamento de Química Biológica and, ‡Instituto de Investigaciones en Fisicoquímica de Córdoba (INFIQC-CONICET), Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba. Haya de la Torre y Medina Allende, Ciudad Universitaria , X5000HUA, Córdoba, Argentina
| | - Milagro Mottola
- Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC-CONICET), Departamento de Química Biológica and, ‡Instituto de Investigaciones en Fisicoquímica de Córdoba (INFIQC-CONICET), Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba. Haya de la Torre y Medina Allende, Ciudad Universitaria , X5000HUA, Córdoba, Argentina
| | - Raquel V Vico
- Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC-CONICET), Departamento de Química Biológica and, ‡Instituto de Investigaciones en Fisicoquímica de Córdoba (INFIQC-CONICET), Departamento de Química Orgánica, 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-CONICET), Departamento de Química Biológica and, ‡Instituto de Investigaciones en Fisicoquímica de Córdoba (INFIQC-CONICET), Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba. Haya de la Torre y Medina Allende, Ciudad Universitaria , X5000HUA, Córdoba, Argentina
| | - María Laura Fanani
- Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC-CONICET), Departamento de Química Biológica and, ‡Instituto de Investigaciones en Fisicoquímica de Córdoba (INFIQC-CONICET), Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba. Haya de la Torre y Medina Allende, Ciudad Universitaria , X5000HUA, Córdoba, Argentina
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24
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Strategies for Exploring Electrostatic and Nonelectrostatic Contributions to the Interaction of Helical Antimicrobial Peptides with Model Membranes. ADVANCES IN BIOMEMBRANES AND LIPID SELF-ASSEMBLY 2016. [DOI: 10.1016/bs.abl.2016.05.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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25
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Kotecka K, Krysinski P. Effect of tetracycline antibiotic on the monolayers of phosphatidylcholines at the air–water interface. Colloids Surf A Physicochem Eng Asp 2015. [DOI: 10.1016/j.colsurfa.2015.05.055] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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26
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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
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27
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Riva JS, Cámara CI, Juarez AV, Yudi LM. Electrochemical behaviour of cationic polyelectrolytes at a polarized liquid/liquid interface. J APPL ELECTROCHEM 2014. [DOI: 10.1007/s10800-014-0747-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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28
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Villasuso AL, Wilke N, Maggio B, Machado E. Zn(2+)-dependent surface behavior of diacylglycerol pyrophosphate and its mixtures with phosphatidic acid at different pHs. FRONTIERS IN PLANT SCIENCE 2014; 5:371. [PMID: 25120554 PMCID: PMC4114284 DOI: 10.3389/fpls.2014.00371] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/09/2014] [Accepted: 07/11/2014] [Indexed: 06/03/2023]
Abstract
Diacylglycerol pyrophosphate (DGPP) is a minor lipid that attenuates the phosphatidic acid (PA) signal, and also DGPP itself would be a signaling lipid. Diacylglycerol pyrophosphate is an anionic phospholipid with a pyrophosphate group attached to diacylglycerol that was shown to respond to changes of pH, thus affecting the surface organization of DGPP and their interaction with PA. In this work, we have investigated how the presence of Zn(2+) modulates the surface organization of DGPP and its interaction with PA at acidic and basic pHs. Both lipids formed expanded monolayers at pHs 5 and 8. At pH 5, monolayers formed by DGPP became stiffer when Zn(2+)was added to the subphase, while the surface potential decreased. At this pH, Zn(2+) induced a phase transition from an expanded to a condensed-phase state in monolayers formed by PA. Conversely, at pH 8 the effects induced by the presence of Zn(2+) on the surface behaviors of the pure lipids were smaller. Thus, the interaction of the bivalent cation with both lipids was modulated by pH and by the ionization state of the polar head groups. Mixed monolayers of PA and DGPP showed a non-ideal behavior and were not affected by the presence of Zn(2+) at pH 8. This could be explained considering that when mixed, the lipids formed a closely packed monolayer that could not be further modified by the cation. Our results indicate that DGPP and PA exhibit expanded- and condensed-phase states depending on pH, on the proportion of each lipid in the film and on the presence of Zn(2+). This may have implications for a possible role of DGPP as a signaling lipid molecule.
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Affiliation(s)
- Ana L. Villasuso
- Departamento de Biología Molecular, FCEFQN, Universidad Nacional de Río CuartoRío Cuarto, Argentina
| | - Natalia Wilke
- Facultad de Ciencias Químicas, Departamento de Química Biológica-Centro de Investigaciones en Química Biológica de Córdoba, Universidad Nacional de Córdoba, Ciudad UniversitariaCórdoba, Argentina
| | - Bruno Maggio
- Facultad de Ciencias Químicas, Departamento de Química Biológica-Centro de Investigaciones en Química Biológica de Córdoba, Universidad Nacional de Córdoba, Ciudad UniversitariaCórdoba, Argentina
| | - Estela Machado
- Departamento de Biología Molecular, FCEFQN, Universidad Nacional de Río CuartoRío Cuarto, Argentina
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29
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Phase coexistence in films composed of DLPC and DPPC: A comparison between different model membrane systems. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2014; 1838:1823-31. [DOI: 10.1016/j.bbamem.2014.02.012] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2013] [Revised: 02/12/2014] [Accepted: 02/19/2014] [Indexed: 11/20/2022]
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30
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Barile CJ, Tse ECM, Li Y, Sobyra TB, Zimmerman SC, Hosseini A, Gewirth AA. Proton switch for modulating oxygen reduction by a copper electrocatalyst embedded in a hybrid bilayer membrane. NATURE MATERIALS 2014; 13:619-23. [PMID: 24813418 DOI: 10.1038/nmat3974] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2013] [Accepted: 03/28/2014] [Indexed: 05/26/2023]
Abstract
Molecular switches gate many fundamental processes in natural and artificial systems. Here, we report the development of an electrochemical platform in which a proton carrier switches the activity of a catalyst. By incorporating an alkyl phosphate in the lipid layer of a hybrid bilayer membrane, we regulate proton transport to a Cu-based molecular oxygen reduction reaction catalyst. To construct this hybrid bilayer membrane system, we prepare an example of a synthetic Cu oxygen reduction reaction catalyst that forms a self-assembled monolayer on Au surfaces. We then embed this Cu catalyst inside a hybrid bilayer membrane by depositing a monolayer of lipid on the self-assembled monolayer. We envisage that this electrochemical system can give a unique mechanistic insight not only into the oxygen reduction reaction, but into proton-coupled electron transfer in general.
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Affiliation(s)
- Christopher J Barile
- 1] Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA [2]
| | - Edmund C M Tse
- 1] Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA [2]
| | - Ying Li
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
| | - Thomas B Sobyra
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
| | - Steven C Zimmerman
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
| | - Ali Hosseini
- Department of Chemical and Materials Engineering, The University of Auckland, Auckland 1010, New Zealand
| | - Andrew A Gewirth
- 1] Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA [2] International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka 812-8581, Japan
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31
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Caruso B, Villarreal M, Reinaudi L, Wilke N. Inter-Domain Interactions in Charged Lipid Monolayers. J Phys Chem B 2014; 118:519-29. [DOI: 10.1021/jp408053a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Benjamín Caruso
- Centro de Investigaciones en Química Biológica de Córdoba
(CIQUIBIC), Dpto. de Química Biológica, and ‡Instituto de Investigaciones
en Físico-Química de Córdoba (INFIQC), Dpto.
de Matemática y Física, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Pabellón Argentina, Ciudad Universitaria, X5000HUA Córdoba, Argentina
| | - Marcos Villarreal
- Centro de Investigaciones en Química Biológica de Córdoba
(CIQUIBIC), Dpto. de Química Biológica, and ‡Instituto de Investigaciones
en Físico-Química de Córdoba (INFIQC), Dpto.
de Matemática y Física, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Pabellón Argentina, Ciudad Universitaria, X5000HUA Córdoba, Argentina
| | - Luis Reinaudi
- Centro de Investigaciones en Química Biológica de Córdoba
(CIQUIBIC), Dpto. de Química Biológica, and ‡Instituto de Investigaciones
en Físico-Química de Córdoba (INFIQC), Dpto.
de Matemática y Física, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Pabellón Argentina, Ciudad Universitaria, X5000HUA Córdoba, Argentina
| | - Natalia Wilke
- Centro de Investigaciones en Química Biológica de Córdoba
(CIQUIBIC), Dpto. de Química Biológica, and ‡Instituto de Investigaciones
en Físico-Química de Córdoba (INFIQC), Dpto.
de Matemática y Física, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Pabellón Argentina, Ciudad Universitaria, X5000HUA Córdoba, Argentina
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32
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Wilke N. Lipid Monolayers at the Air–Water Interface. ADVANCES IN PLANAR LIPID BILAYERS AND LIPOSOMES 2014. [DOI: 10.1016/b978-0-12-418698-9.00002-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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33
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Potential-mediated interaction between dextran sulfate and negatively charged phospholipids films at air/water and liquid/liquid interfaces. Electrochim Acta 2013. [DOI: 10.1016/j.electacta.2013.09.137] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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34
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Ascorbyl palmitate interaction with phospholipid monolayers: Electrostatic and rheological preponderancy. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2013; 1828:2496-505. [DOI: 10.1016/j.bbamem.2013.06.016] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2013] [Revised: 06/01/2013] [Accepted: 06/13/2013] [Indexed: 11/20/2022]
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Caruso B, Mangiarotti A, Wilke N. Stiffness of lipid monolayers with phase coexistence. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:10807-10816. [PMID: 23906426 DOI: 10.1021/la4018322] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The surface dilational modulus--or compressibility modulus--has been previously studied for monolayers composed of pure materials, where a jump in this modulus was related with the onset of percolation as a result of the establishment of a connected structure at the molecular level. In this work, we focused on monolayers composed of two components of low lateral miscibility. Our aim was to investigate the compressibility of mixed monolayers at pressures and compositions in the two-phase region of the phase diagram, in order to analyze the effect of the mechanical properties of each phase on the stiffness of the composite. In nine different systems with distinct molecular dipoles and charges, the stiffness of each phase and the texture at the plane of the monolayer were studied. In this way, we were able to analyze the general compressibility of two-phase lipid monolayers, regardless of the properties of their constituent parts. The results are discussed in the light of the following two hypotheses: first, the stiffness of the composite could be dominated by the stiffness of each phase as a weighted sum according to the percentage of each phase area, regardless of the distribution of the phases in the plane of the monolayer. Alternatively, the stiffness of the composite could be dominated by the mechanical properties of the continuous phase. Our results were better explained by this latter proposal, as in all the analyzed mixtures it was found that the mechanical properties of the percolating phase were the determining factors. The value of the compression modulus was closer to the value of the connected phase than to that of the dispersed phase, indicating that the bidimensional composites displayed mechanical properties that were related to the properties of each phases in a rather complex manner.
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Affiliation(s)
- Benjamín Caruso
- Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC), Departamento de Química Biológica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Pabellón Argentina, Ciudad Universitaria, X5000HUA Córdoba, Argentina
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Cámara CI, Quiroga MVC, Wilke N, Jimenez-Kairuz A, Yudi LM. Effect of chitosan on distearoylphosphatidylglycerol films at air/water and liquid/liquid interfaces. Electrochim Acta 2013. [DOI: 10.1016/j.electacta.2013.01.137] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Bernardini C, Stoyanov SD, Arnaudov LN, Cohen Stuart MA. Colloids in Flatland: a perspective on 2D phase-separated systems, characterisation methods, and lineactant design. Chem Soc Rev 2013; 42:2100-29. [DOI: 10.1039/c2cs35269a] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Bischof AA, Wilke N. Molecular determinants for the line tension of coexisting liquid phases in monolayers. Chem Phys Lipids 2012; 165:737-44. [PMID: 22982729 DOI: 10.1016/j.chemphyslip.2012.08.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2012] [Revised: 08/27/2012] [Accepted: 08/28/2012] [Indexed: 02/01/2023]
Abstract
The line tension (λ) in biphasic membranes has been determined in monolayers and bilayers using a variety of techniques. In this work we present a novel approach to the determination of λ in monolayers with liquid/liquid phase coexistence, overcoming several of the drawbacks of current techniques. Using our method, we determined the line tension of liquid/liquid phases in binary mixtures of different lipids and a molecule similar to cholesterol but less oxidizable. We analyzed the effect of the hydrocarbon chain length and the polar head-group of the non-sterol lipid and found the latter to exert much more influence than the former. The presence of PE led to high λ values, PG to low values and PS and PC to intermediate values. The line tension showed a strong correlation with the critical packing parameter of the phospholipid. The spontaneous curvature displayed by the phases constituted by a particular lipid appears to be an important parameter for determining the line tension in mixed films.
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Affiliation(s)
- Andrea Alejandra Bischof
- Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC), Dpto. de Química Biológica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Pabellón Argentina, Ciudad Universitaria, X5000HUA Córdoba, Argentina
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Benedini L, Fanani ML, Maggio B, Wilke N, Messina P, Palma S, Schulz P. Surface phase behavior and domain topography of ascorbyl palmitate monolayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:10914-9. [PMID: 21766856 DOI: 10.1021/la201847j] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Ascorbyl palmitate (ASC(16)) is a molecule of potential pharmacological interest due to its antioxidant properties and amphiphilic nature. The surface behavior of ASC(16) was studied using Langmuir monolayers and Brewster angle microscopy. This molecule formed stable monolayers at room temperature that showed phase transition from a liquid-expanded to liquid-condensed or crystalline phase, depending on the subphase conditions. Using a theoretical approach, we were able to explain the behavior of the ASC(16) film at different bulk pH values and salt conditions based on the surface pH and the dissociation fraction of the film. Both condensed phases corresponded to highly packed conditions with the crystalline phase occurring at a low charge density, showing molecular tilting and preferential growth at characteristic angles, while the liquid-condensed phase formed in highly charged surfaces revealed small flowerlike domains probably as a consequence of internal dipole repulsion. A smaller perpendicular dipole moment was observed for the crystalline than the liquid-condensed phase which may explain the domain features. In conclusion, ASC(16) showed a complex surface behavior that was highly sensitive to subphase conditions.
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Affiliation(s)
- Luciano Benedini
- Instituto de Química del Sur (INQUISUR-CONICET), Departamento de Química, Universidad Nacional del Sur, 8000FTN Bahía Blanca, Argentina
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Wilke N, Maggio B. Electrostatic field effects on membrane domain segregation and on lateral diffusion. Biophys Rev 2011; 3:185-192. [PMID: 28510045 DOI: 10.1007/s12551-011-0057-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2011] [Accepted: 08/20/2011] [Indexed: 12/17/2022] Open
Abstract
Natural membranes are organized structures of neutral and charged molecules bearing dipole moments which generate local non-homogeneous electric fields. When subjected to such fields, the molecules experience net forces that can modify the lipid and protein organization, thus modulating cell activities and influencing (or even dominating) the biological functions. The energetics of electrostatic interactions in membranes is a long-range effect which can vary over distance within r-1 to r-3. In the case of a dipole interacting with a plane of dipoles, e.g. a protein interacting with a lipid domain, the interaction is stronger than two punctual dipoles and depends on the size of the domain. In this article, we review several contributions on how electrostatic interactions in the membrane plane can modulate the phase behavior, surface topography and mechanical properties in monolayers and bilayers.
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Affiliation(s)
- Natalia Wilke
- Centro de Investigaciones de Química Bológica de Córdoba (CIQUIBIC-CONICET), Departamento de Química Biológica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, Argentina. .,CIQUIBIC, Dpto. de Química Biológica, Fac. de Cs. Químicas, UNC, Pabellón Argentina, Ciudad Universitaria, X5000HUA, Córdoba, Argentina.
| | - Bruno Maggio
- Centro de Investigaciones de Química Bológica de Córdoba (CIQUIBIC-CONICET), Departamento de Química Biológica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, Argentina
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