Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/65967
Title: Impact of Galactosylceramide on the nanomechanical properties lipid bilayer models: AFM-force spectroscopy study
Author: Gumí-Audenis, Berta
Sanz Carrasco, Fausto
Giannotti, Marina I. (Ines)
Keywords: Membranes (Biologia)
Nanotecnologia
Membranes (Biology)
Nanotechnology
Issue Date: 2-Jun-2015
Publisher: Royal Society of Chemistry
Abstract: Galactosylceramides (GalCer) are glycosphingolipids bound to a monosaccharide group, responsible for inducing extensive hydrogen bonds that yield their alignment and accumulation in the outer leaflet of the biological membrane together with cholesterol (Chol) in rafts. In this work, the influence of GalCer on the nanomechanical properties of supported lipid bilayer (SLB) based on DPPC (1,2-dipalmitoyl-sn-glycero-3-phosphocholine) and DLPC (1,2-didodecanoyl-sn-glycero-3-phosphocoline) as model systems was assesed. Phosphatidylcholine (PC):GalCer SLBs were characterized by means of differential scanning calorimetry (DSC) and atomic force microscopy (AFM), in both imaging and force spectroscopy (AFM-FS) modes. Comparing both PC systems, we determined that the behaviour of SLBs mixtures is governed by the PC phase-like state at the working temperature. While a phase segregated system is observed for DLPC:GalCer SLBs, GalCer is found to be dissolved in the DPPC SLBs for GalCer contents up to 20 mol %. In both systems, the incorporation of GalCer intensifies the nanomechanical properties of SLBs. Interestingly, segregated domains of exceptionally high mechanical stability are formed in DLPC:GalCer SLBs. Finally, the role of 20 mol % Chol in GalCer organization and function in the membranes was assessed. Both PC model systems displayed phase segregation and remarkable nanomechanical stability when GalCer and Chol coexist in the SLBs.
Note: Reproducció del document publicat a: http://dx.doi.org/10.1039/C5SM01252J
It is part of: Soft Matter, 2015, p. 1-9
Related resource: http://dx.doi.org/10.1039/C5SM01252J
URI: http://hdl.handle.net/2445/65967
ISSN: 1744-683X
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)
Articles publicats en revistes (Institut de Bioenginyeria de Catalunya (IBEC))

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