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• W1996064306 abstract "The effect of 1-O-octadecyl-2-O-methyl-sn-glycero-3-phosphocholine (ET-18-OCH3, edelfosine), and six other analog asymmetric phosholipids on the physical properties of 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) model membranes was studied using differential scanning calorimetry (DSC), 31P-nuclear magnetic resonance (31P NMR) and X-ray diffraction. DSC data revealed that, at concentrations of 40 mol% and higher, a new type of mixtures with higher Tc and narrower transitions appeared with all the asymmetric lipids studied. At very high concentrations of these lipids (50–80 mol%), destabilization was observed in the systems probably because of the formation of micelles or small vesicles. In all cases, the asymmetric lipids at concentrations of 40 mol% induced the formation of interdigitated structures in the lamellar gel phase, as deduced from X-ray diffraction. The asymmetric phospholipids were also added to 1,2-dielaidoyl-sn-glycero-3-phosphoethanolamine (DEPE) model membranes and DSC data revealed that the lipids primarily affected transition from the lamellar gel (Lβ) to the lamellar liquid crystalline (Lα) phase in two aspects: the transition temperature was reduced, and the transition itself became broader and smaller. The lamellar liquid crystalline (Lα) to inverted hexagonal phase (HII) transition was also affected, as detected by DSC and 31P NMR data. Increasing concentrations of the asymmetric lipids reduced the formation of inverted hexagonal phases, which were completely inhibited in the case of ET-18-OCH3. Since these compounds have been shown to have important biological actions through the plasma membrane, these results may help to understand the mechanism of action of these compounds. In addition these asymmetric lipids were tested for their capacity to induce cell apoptosis, and only ET-18-OCH3 was found to have a clear effect, thus suggesting that the apoptotic effect is not exerted through changes in the biophysical properties of model membranes." @default.
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• W1996064306 date "2006-08-01" @default.
• W1996064306 modified "2023-10-17" @default.
• W1996064306 title "Effects of the anti-neoplastic agent ET-18-OCH3 and some analogs on the biophysical properties of model membranes" @default.
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• W1996064306 doi "https://doi.org/10.1016/j.ijpharm.2006.03.008" @default.
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