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• W2324355587 startingPage "13956" @default.
• W2324355587 abstract "A recurring question in membrane biological chemistry is whether bioactive signaling lipids act only as second messenger ligands or also through an effect on bilayer physical properties. Sphingosine (Sph) and sphingosine-1-phosphate (S1P) are single-chained charged sphingolipids that have antagonistic functions in the “sphingolipid rheostat” which determines cell fate. Sph and S1P respectively promote apoptosis and cell growth. In the present study, potential effects of these bioactive lipids on physicochemical properties of the lipid bilayer of cell membranes were evaluated. We have investigated the effect of both sphingolipids, incorporated separately or, for the first time, together, in large or giant phosphadidylcholine (PC) unilamellar vesicles. Three bilayer properties were examined: membrane surface charge, lipid packing, and formation of membrane microdomains. Sph and S1P appear to have distinct, when not inverse, effects on all three properties. Besides, when both sphingolipids are mixed together, their effects on lipid packing are synergistic, whereas their effects on microdomain formation and zeta-potential are mostly antagonistic. These results are interpreted as arising from different electrostatic interactions between lipid headgroups. In particular, Sph and S1P may interact together electrostatically and form a complex. These mostly inverse and opposing effects of both single-chain phospholipids on membrane physical properties might be involved in their antagonistic role in regulating cell fate. Particularly, the mutual interaction between Sph and S1P as a complex might be able to sequester both molecules in a biologically inactive form and therefore to promote a mutual regulation of their biological activities, depending on their ratio, consistent with the sphingolipid rheostat." @default.
• W2324355587 created "2016-06-24" @default.
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• W2324355587 date "2014-11-11" @default.
• W2324355587 modified "2023-10-03" @default.
• W2324355587 title "Antagonism and Synergy of Single Chain Sphingolipids Sphingosine and Sphingosine-1-phosphate toward Lipid Bilayer Properties. Consequences for Their Role as Cell Fate Regulators" @default.
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• W2324355587 doi "https://doi.org/10.1021/la5039816" @default.
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• W2324355587 hasPublicationYear "2014" @default.
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