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• W1484994078 abstract "The rates of exchange of [4-14C]cholesterol between lipid vesicles prepared with different phospholipids and with different sizes have been measured. The first-order rate constants were higher using vesicles prepared from phosphatidylcholines with highly branched or polyunsaturated fatty acyl chains than with saturated diacyl or di-O-alkyl chains. The rate measurements indicate that the affinity of cholesterol for phospholipid does not vary significantly on change of the type of linkage (ether or ester) in phosphatidylcholine (PC) or of the positions of the fatty acyl chains in 1,2-diacyl-PC bearing one saturated and one unsaturated chain; furthermore, egg phosphatidylglycerol and egg phosphatidylethanolamine appear to have comparable affinities for cholesterol. However, the molecular packing in the bilayer and nearest-neighbor interactions involving cholesterol appear tightened more by N-palmitoylsphingomyelin than by dipalmitoyl-PC; on incorporation of 44 mol % of these phospholipids (which have the same fatty acyl chain composition) into either small or large unilamellar vesicles prepared with egg phosphatidylglycerol, the exchange rates were strikingly slower when the donor species contained sphingomyelin compared with PC. The rate of cholesterol exchange was 100% faster with small unilamellar vesicles than with large unilamellar vesicles as donors, suggesting that the looser packing in the highly curved small vesicles facilitates cholesterol desorption. The cholesterol exchange rate did not vary with the size of the acceptor vesicles, which indicates that desorption is the rate-limiting step in the exchange process in the presence of excess acceptors." @default.
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• W1484994078 date "1985-04-01" @default.
• W1484994078 modified "2023-10-16" @default.
• W1484994078 title "Movement of cholesterol between vesicles prepared with different phospholipids or sizes." @default.
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• W1484994078 doi "https://doi.org/10.1016/s0021-9258(18)89236-5" @default.
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