Phosphonium carbosilane dendrimers – interaction with a simple biological membrane model

2018 ◽  
Vol 20 (21) ◽  
pp. 14753-14764 ◽  
Author(s):  
Dominika Wrobel ◽  
Radka Kubikova ◽  
Monika Müllerová ◽  
Tomas Strašák ◽  
Květoslav Růžička ◽  
...  
Keyword(s):  
Lipid Bilayer ◽  
Biological Membrane ◽  
Membrane Model ◽  
Carbosilane Dendrimers

Factors such as shielding of charge on dendrimers by bulky substituents and/or hydrophobicity of substituents are important for final ability of dendrimers to interact with and to penetrate deep into the lipid bilayer.

The biophysical interaction of ferulic acid with liposomes as biological membrane model: The effect of the lipid bilayer composition

2020 ◽  
pp. 114689
Author(s):  
Stéphanie Andrade ◽  
Maria João Ramalho ◽  
Joana Angélica Loureiro ◽  
Maria Carmo Pereira
Keyword(s):  
Ferulic Acid ◽  
Lipid Bilayer ◽  
Biological Membrane ◽  
Membrane Model

scholarly journals Surface roughness as rupture control factor of lipid vesicles

2013 ◽  
Vol 19 (S4) ◽  
pp. 107-108 ◽  
Author(s):  
A.A. Duarte ◽  
M. Raposo
Keyword(s):  
Lipid Bilayer ◽  
Lipid Bilayers ◽  
Biological Membrane ◽  
Substrate Surface ◽  
Lipid Vesicles ◽  
Planar Lipid Bilayer ◽  
Root Mean Square Roughness ◽  
Control Factor ◽  
Formation Mechanisms ◽  
Adsorbed Amount

Liposomes or lipid vesicles are self-closed structures formed by one or several concentric lipid bilayers with an aqueous phase inside, which may incorporate almost any molecule, namely proteins, hormones, enzymes, antibiotics, anticancer agents, antifungical agents, gene transfer agents, DNA, and whole viruses. Scientific evidences prove that unprotected liposomes containing drugs are easily released from the endoplasmic reticulum of the cell. To increase the vesicles lifetime and to activate a controlled drug release with an external stimulus, the vesicles immobilization on a surface and the factors which create conditions to the liposome rupture have to be analyzed. A number of studies have identified some of the critical stages of vesicle adsorption (adhesion), fusion, deformation, rupture, and spreading of the lipid bilayer. Nevertheless, the formation mechanisms of well-controlled continuous supported bilayers or adsorption of whole liposomes are still not fully understood. As yet it was demonstrated that a controlled adsorption of vesicles containing a small fraction of charged lipids occurs without rupture and their subsequent embedding in polyelectrolyte multilayer (PEM) films, meaning vesicles may be immobilized in an intact or slightly deformed state, which can act as drug reservoirs. Moreover, depending on the nature of the physicochemical conditions of the vesicle solution and the substrate surface, a flat lipid bilayer can be formed, known as supported lipid bilayers, which can incorporate membrane proteins and keep the native dynamics of the lipid bilayer mimicking a biological membrane. In this study, a layer of 1,2-dipalmitoyl-sn-glycero-3-[phospho-rac-(1-glycerol)] (sodium salt) (DPPG) liposomes adsorbed onto PEMs cushions based on poly(ethylenimine) (PEI), poly(sodium 4-styrenesulfonate) (PSS) and poly(allylamine hydrochloride) (PAH) polyelectrolytes was analyzed by atomic force microscopy (AFM) technique in non-contact mode and quartz crystal microbalance (QCM).Sequential heterostructures of Si/PEI(PSS/PAH)4 and Si/PAH, also designated cushions, were prepared onto silicon substrates using the layer-by-layer (LbL) technique with polyelectrolyte solutions of PEI, PSS and PAH of monomeric concentrations of 0.01M. Topographic images of 1×1μm2 area of Si/PAH/DPPG (Figure 1 a), and Si/PEI(PSS/PAH)4/DPPG (Figure 1 b) LbL films were acquired by AFM. The root mean square roughness (RMS) calculated from topographies data are listed in table I. As shown, when a DPPG layer is adsorbed onto Si/PAH the RMS keeps an approximately equal value meaning that the liposome disrupted and spread onto the surface forming a planar lipid bilayer. But when a DPPG layer is adsorbed onto Si/PEI(PSS/PAH)4 the RMS value doubled, indicating that the structural integrity of the liposomes is maintained, even though there has been any deformation during adsorption. The adsorbed amount of the two PEMs and DPPG-liposomes layers was measured using a QCM and is displayed in table I. The DPPG adsorbed amount obtained on the PAH cushion was approximately equal to a planar lipid bilayer, while the adsorption onto PEI(PSS/PAH)4 was higher than the predicted for a planar lipid bilayer. This behavior suggests that the DPPG liposomes on the second PEM remained intact during adsorption. Both confirm the AFM results. Therefore we conclude that the initial roughness of the surface is a primordial factor to determine the adsorption or not of intact vesicles.The authors acknowledge the “Fundação para a Ciência e Tecnologia” (FCT-MEC) by the post-graduate scholarship SFRH/BD/62229/2009 and the “Plurianual” funding.

scholarly journals Spatial structure of beta-amyloid Aβ<sub>1-40</sub> in complex with a biological membrane model

2012 ◽  
Vol 01 (03) ◽  
pp. 22-29 ◽  
Author(s):  
Konstantin S. Usachev ◽  
Andrey V. Filippov ◽  
Oleg N. Antzutkin ◽  
Vladimir V. Klochkov
Keyword(s):  
Spatial Structure ◽  
Biological Membrane ◽  
Beta Amyloid ◽  
Membrane Model ◽  
Amyloid Aβ

Surface Functionalization of a Polymeric Lipid Bilayer for Coupling a Model Biological Membrane with Molecules, Cells, and Microstructures

Langmuir ◽  
2013 ◽  
Vol 29 (8) ◽  
pp. 2722-2730 ◽  
Author(s):  
Kenichi Morigaki ◽  
Kazuyuki Mizutani ◽  
Makoto Saito ◽  
Takashi Okazaki ◽  
Yoshihiro Nakajima ◽  
...  
Keyword(s):  
Lipid Bilayer ◽  
Surface Functionalization ◽  
Biological Membrane

scholarly journals Investigating Lipid-Protein Interactions in a Complex Biological Membrane Model

2016 ◽  
Vol 110 (3) ◽  
pp. 419a
Author(s):  
Karelia H. Delgado-Magnero ◽  
Gurpreet Singh ◽  
Valentina Corradi ◽  
D. Peter Tieleman
Keyword(s):  
Protein Interactions ◽  
Biological Membrane ◽  
Membrane Model ◽  
Lipid Protein Interactions

Protein tethered lipid bilayer: An alternative mimic of the biological membrane (Mini Review)

2008 ◽  
Vol 3 (2) ◽  
pp. FA101-FA107 ◽  
Author(s):  
Renate L. C. Naumann ◽  
Wolfgang Knoll
Keyword(s):  
Lipid Bilayer ◽  
Biological Membrane

β-Cyclodextrins influence on E-3,5,4′-trimethoxystilbene absorption across biological membrane model: A differential scanning calorimetry evidence

2010 ◽  
Vol 388 (1-2) ◽  
pp. 144-150 ◽  
Author(s):  
Maria Grazia Sarpietro ◽  
Sara Ottimo ◽  
Maria Chiara Giuffrida ◽  
Carmela Spatafora ◽  
Corrado Tringali ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Biological Membrane ◽  
Membrane Model ◽  
Scanning Calorimetry
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