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Reorganization of the outer layer of a model of the plasma membrane induced by a neuroprotective aminosterol. Colloids Surf B Biointerfaces 2023; 222:113115. [PMID: 36603410 DOI: 10.1016/j.colsurfb.2022.113115] [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: 10/10/2022] [Revised: 12/07/2022] [Accepted: 12/20/2022] [Indexed: 12/24/2022]
Abstract
Trodusquemine is an amphipathic aminosterol that has recently shown therapeutic benefit in neurodegenerative diseases altering the binding of misfolded proteins to the cell membrane. To unravel the underlying mechanism, we studied the interactions between Trodusquemine (TRO) and lipid monolayers simulating the outer layer of the plasma membrane. We selected two different compositions of dioleoylphosphatidylcholine (DOPC), sphingomyelin (SM), cholesterol (Chol) and monosialotetrahexosylganglioside (GM1) lipid mixture mimicking either a lipid-raft containing membrane (Ld+So phases) or a single-phase disordered membrane (Ld phase). Surface pressure-area isotherms and surface compressional modulus-area combined with Brewster Angle Microscopy (BAM) provided the thermodynamic and morphological information on the lipid monolayer in the presence of increasing amounts of TRO in the monolayer. Experiments revealed that TRO forms stable spreading monolayers at the buffer-air interface where it undergoes multiple reversible phase transitions to bi- and tri-layers at the interface. When TRO was spread at the interface with the lipid mixtures, we found that it distributes in the lipid monolayer for both the selected lipid compositions, but a maximum TRO uptake in the rafts-containing monolayer was observed for a Lipid/TRO molar ratio equal to 3:2. Statistical analysis of BAM images revealed that TRO induces a decrease in the size of the condensed domains, an increase in their number and in the thickness mismatch between the Ld and So phase. Experiments and MD simulations converge to indicate that TRO adsorbs preferentially at the border of the So domains. Removal of GM1 from the lipid Ld+So mixture resulted in an even greater TRO-mediated reduction of the size of the So domains suggesting that the presence of GM1 hinders the localization of TRO at the So domains boundaries. Taken together these observations suggest that Trodusquemine influences the organization of lipid rafts within the neuronal membrane in a dose-dependent manner whereas it evenly distributes in disordered expanded phases of the membrane model.
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Zhang D, Liu Y, Gao H, Yan Q, Cheng X. Self-assembly of bistriazole BDT based bolaamphiphiles into SmA phase and helical organogels. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2020.114521] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Scherz LF, Schroyen B, Pepicelli M, Schlüter DA, Vermant J, Vlassopoulos D. Molecularly Designed Interfacial Viscoelasticity by Dendronized Polymers: From Flexible Macromolecules to Colloidal Objects. ACS NANO 2019; 13:14217-14229. [PMID: 31743645 DOI: 10.1021/acsnano.9b07142] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The thermodynamic and rheological properties of densely packed dendronized polymers (DPs) at water-air interfaces were studied here for first- and fourth-generation DPs (PG1, PG4) with both small (Pn ≈ 50) and large (Pn ≈ 500) backbone degrees of polymerization. The excellent control over the structural characteristics of these polymers enabled us to investigate how the interfacial properties change as we go from thin, flexible macromolecules toward thicker molecular objects that display colloidal features. The effects of the dendron generation, affecting the persistence length, as well as the degree of polymerization and surface pressure on the formation of DP layers at the water-air interface were studied. Surface pressure measurements and interfacial rheology suggest the existence of significant attractive interactions between the molecules of the higher generation DPs. While all DPs featured reproducible Π-A diagrams, successive compression-expansion cycles and surface pressure relaxation experiments revealed differences in the stability of the formed films, which are consistent with the variations in shape persistence and interactions between the studied DPs. Atomic force microscopy after Langmuir-Blodgett transfer of the films displayed a nanostructuring that can be attributed to the increase in attractive forces with increasing polymer generation and anisotropy. The importance of such structures on the surface properties was probed by interfacial shear rheology, which validated the existence of strong albeit brittle structures for fourth-generation DPs. Ultimately, we demonstrate how in particular rod-like DPs can be used as robust foam stabilizers.
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Affiliation(s)
- Leon F Scherz
- Department of Materials , ETH Zürich , 8093 Zürich , Switzerland
| | - Bram Schroyen
- Department of Materials , ETH Zürich , 8093 Zürich , Switzerland
| | | | | | - Jan Vermant
- Department of Materials , ETH Zürich , 8093 Zürich , Switzerland
| | - Dimitris Vlassopoulos
- Institute of Electronic Structure and Laser , FORTH, 70013 Heraklion , Greece
- Department of Materials Science and Technology , University of Crete , 70013 Heraklion , Greece
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Dutkiewicz M, Karasiewicz J, Rojewska M, Skrzypiec M, Dopierała K, Prochaska K, Maciejewski H. Synthesis of an Open-Cage Structure POSS Containing Various Functional Groups and Their Effect on the Formation and Properties of Langmuir Monolayers. Chemistry 2016; 22:13275-86. [DOI: 10.1002/chem.201602456] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Michał Dutkiewicz
- Centre for Advanced Technologies; Adam Mickiewicz University in Poznań; Umultowska 89 C 61-614 Poznań Poland
- Poznań Science and Technology Park; Adam Mickiewicz University Foundation; Rubież 46 61-612 Poznań Poland
| | - Joanna Karasiewicz
- Faculty of Chemistry; Adam Mickiewicz University in Poznań; Umultowska 89 B 61-614 Poznań Poland
| | - Monika Rojewska
- Institute of Chemical Technology and Engineering; Poznań University of Technology; Berdychowo 4 60-965 Poznań Poland
| | - Marta Skrzypiec
- Institute of Chemical Technology and Engineering; Poznań University of Technology; Berdychowo 4 60-965 Poznań Poland
| | - Katarzyna Dopierała
- Institute of Chemical Technology and Engineering; Poznań University of Technology; Berdychowo 4 60-965 Poznań Poland
| | - Krystyna Prochaska
- Institute of Chemical Technology and Engineering; Poznań University of Technology; Berdychowo 4 60-965 Poznań Poland
| | - Hieronim Maciejewski
- Faculty of Chemistry; Adam Mickiewicz University in Poznań; Umultowska 89 B 61-614 Poznań Poland
- Poznań Science and Technology Park; Adam Mickiewicz University Foundation; Rubież 46 61-612 Poznań Poland
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Lukáč M, Garajová M, Mrva M, Devínsky F, Ondriska F, Kubincová J. Novel fluorinated dialkylphosphonatocholines: Synthesis, physicochemical properties and antiprotozoal activities against Acanthamoeba spp. J Fluor Chem 2014. [DOI: 10.1016/j.jfluchem.2014.04.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Brzozowska A, Paczesny J, Parzuchowski P, Kusznerczuk M, Nikiforov K, Rokicki G, Gregorowicz J. Hyperbranched Polyesters Terminated with Alkyl Chains of Different Length at the Air/Water Interface and on Solid Substrates. Macromolecules 2014. [DOI: 10.1021/ma500941c] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Anna Brzozowska
- Institute
of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Jan Paczesny
- Institute
of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Paweł Parzuchowski
- Faculty
of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
| | - Monika Kusznerczuk
- Faculty
of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
| | - Kostyantyn Nikiforov
- Institute
of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Gabriel Rokicki
- Faculty
of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
| | - Jacek Gregorowicz
- Institute
of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
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Breckon R, Chakraborty S, Zhang C, Diorio N, Gleeson JT, Sprunt S, Twieg RJ, Jákli A. Nanostructures of Nematic Materials of Laterally Branched Molecules. Chemphyschem 2013; 15:1457-62. [DOI: 10.1002/cphc.201300578] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2013] [Revised: 07/12/2013] [Indexed: 11/09/2022]
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Rubia-Payá C, Jimenez-Millán E, Giner-Casares JJ, Brezesinski G, Martín-Romero MT, Camacho L. From two-dimensional to three-dimensional at the air/water interface: the self-aggregation of the acridine dye in mixed monolayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:4796-4805. [PMID: 23516967 DOI: 10.1021/la400483d] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The formation of well-defined supramolecular structures on the nanoscopic scale is a fundamental step in nanotechnology. The fine control of the layer-by-layer growth of the supramolecular assemblies at interfaces is most desirable. The collapse of a mixed monolayer composed of two surfactants in an equimolar ratio (the organic dye N-10-dodecyl acridine (DAO) and stearic acid (SA)) is analyzed herein. The collapse process of the DAO/SA mixed monolayer has been monitored using surface pressure-molecular area (π-A) and surface potential isotherms, UV-visible reflection spectroscopy, polarization-modulated infrared reflection-absorption spectroscopy (PM-IRRAS), Brewster angle microscopy (BAM), and synchrotron-based in situ X-ray reflectivity (XRR) measurements. The collapse of the DAO/SA mixed monolayer leads to an ordered trilayer. The growth of anisotropic 2D domains of micrometric size is observed during the formation of the trilayer, related to the ordering of the acridine polar headgroups. The trilayer is organized with the first and third monolayers displaying the polar headgroups pointing to the aqueous subphase, whereas the intermediate layer displays the polar headgroups pointing to the air. The trilayer is stabilized by the strong self-aggregation acridine dye group of the DAO molecule. The controlled transition from a monolayer to a trilayer described herein is proposed as a model for further interfacial supramolecular structures of tunable thickness comprising organic dyes.
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Affiliation(s)
- Carlos Rubia-Payá
- Department of Physical Chemistry and Applied Thermodynamics, University of Córdoba, Campus de Rabanales, Edificio Marie Curie, Córdoba, Spain
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Schwieger C, Chen B, Tschierske C, Kressler J, Blume A. Organization of T-shaped facial amphiphiles at the air/water interface studied by infrared reflection absorption spectroscopy. J Phys Chem B 2012; 116:12245-56. [PMID: 22931365 DOI: 10.1021/jp306612k] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We studied the behavior of monolayers at the air/water interface of T-shaped facial amphiphiles which show liquid-crystalline mesophases in the bulk. The compounds are composed of a rigid p-terphenyl core (TP) with two terminal hydrophobic ether linked alkyl chains of equal length and one facial hydrophilic tri(ethylene oxide) chain with a carboxylic acid end group. Due to their amphiphilic nature they form stable Langmuir films at the air/water interface. Depending on the alkyl chain length they show markedly different compression isotherms. We used infrared reflection absorption spectroscopy (IRRAS) to study the changes in molecular organization of the TP films upon compression. We could retrieve information on layer thickness, alkyl chain crystallization, and the orientation of the TP cores within the films. Films of TPs with long (16 carbon atoms: TP 16/3) and short (10 carbon atoms: TP 10/3) alkyl chains were compared. Compression of TP 16/3 leads to crystallization of the terminal alkyl chains, whereas the alkyl chains of TP 10/3 stay fluid over the complete compression range. TP 10/3 shows an extended plateau in the compression isotherm which is due to a layering transition. The mechanism of this layering transition is discussed. Special attention was paid to the question of whether a so-called roll-over collapse occurs during compression. From the beginning to the end of the plateau, the layer thickness is increased from 15 to 38 Å and the orientation of the TP cores changes from parallel to the water surface to isotropic. We conclude that the plateau in the compression isotherm reflects the transition of a TP monolayer to a TP multilayer. The monolayer consists of a sublayer of well-organized TP cores underneath a sublayer of fluid alkyl chains whereas the multilayer consists of a well oriented bottom layer and a disordered top layer. Our findings do not support the model of a roll-over collapse. This study demonstrates how the IRRA band intensity of OH or OD stretching vibrations can be used to retrieve information about layer thickness and refractive indices of the film and how multicomponent IRRA bands can be fitted to retrieve information about the orientation of molecules within the monolayer.
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Affiliation(s)
- Christian Schwieger
- Institute of Chemistry, Martin-Luther-University Halle-Wittenberg, von-Dankelmann-Platz 4, D-06120 Halle (Saale), Germany.
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Paczesny J, Sozański K, Żywociński A, Hołyst R, Glettner B, Kieffer R, Tschierske C, Nikiforov K, Pociecha D, Górecka E. Spontaneous self-assembly of partially fluorinated bolaamphiphiles into ordered layered structures. Phys Chem Chem Phys 2012; 14:14365-73. [DOI: 10.1039/c2cp41970j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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