ArticleEuropean biophysics journal : EBJ2013
Neutron diffraction studies of oral stratum corneum model lipid membranes.
Article in European biophysics journal : EBJ, 2013. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
In this work we have investigated model lipid mixtures simulating a lipid component of oral stratum corneum (OSC). Neutron diffraction experiments on oriented samples have revealed that SM (bovine brain)/dipalmitoylphosphatidylethanolamine/dipalmitoylphosphatidylcholine (DPPE/DPPC) mixtures at molar ratios of 1/2/1 and 1/1/1 are one-phase membranes. The incorporation of low concentrations of ceramide 6 and cholesterol into SM/DPPC/DPPE bilayers does not result in a phase separation, affecting membrane hydration. The model OSC membrane composed of ceramide 6/cholesterol/fatty acids/cholesterol sulfate/SM (bovine brain)/DPPE/DPPC is characterized by coexistence of several lamellar phases, that behave differently during their hydration in water excess. The phase with lamellar repeat distance of about 45 Å is likely a ceramide-rich phase and shows a restricted swelling in water, while another phase with repeat distance of 50 Å swells very quickly on 15 Å and then disappears. Our results indicate that phospholipid-rich and ceramide-rich domains could possibly coexist in the intercellular space of oral epithelium.
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