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• W1967268275 abstract "In order to investigate the role of the plasma membrane in determining the kinetics of removal of cholesterol from cells, the efflux of [3H]cholesterol from intact cells and plasma membrane vesicles has been compared. The release of cholesterol from cultures of Fu5AH rat hepatoma and WIRL-3C rat liver cells to complexes of egg phosphatidylcholine (1 mg/ml) and human high-density apolipoprotein is first order with respect to concentration of cholesterol in the cells, with half-times (t 1/2) for at least one-third of the cell cholesterol of 3.2 +/- 0.6 and 14.3 +/- 1.5 h, respectively. Plasma membrane vesicles (0.5-5.0 micron diameter) were produced from both cell lines by incubating the cells with 50 mM formaldehyde and 2 mM dithiothreitol for 90 min. The efflux of cholesterol from the isolated vesicles follows the same kinetics as the intact, parent cells: the t 1/2 values for plasma membrane vesicles of Fu5AH and WIRL cells are 3.9 +/- 0.5 and 11.2 +/- 0.7 h, respectively. These t 1/2 values reflect the rate-limiting step in the cholesterol efflux process, which is the desorption of cholesterol molecules from the plasma membrane into the extracellular aqueous phase. The fact that intact cells and isolated plasma membranes release cholesterol at the same rates indicates that variations in the plasma membrane structure account for differences in the kinetics of cholesterol release from different cell types. In order to investigate the role of plasma membrane lipids, the kinetics of cholesterol desorption from small unilamellar vesicles prepared from the total lipid isolated from plasma membrane vesicles of Fu5AH and WIRL cells were measured. Half-times of cholesterol release from plasma membrane lipid vesicles of Fu5AH and WIRL cells were the same, with values of 3.1 +/- 0.1 and 2.9 +/- 0.2 h, respectively. Since bilayers formed from isolated plasma membrane lipids do not reproduce the kinetics of cholesterol efflux observed with the intact plasma membranes, it is likely that the local domain structure, as influenced by membrane proteins, is responsible for the differences in t 1/2 values for cholesterol efflux from these cell lines." @default.
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• W1967268275 date "1984-11-01" @default.
• W1967268275 modified "2023-09-29" @default.
• W1967268275 title "Role of the plasma membrane in the mechanism of cholesterol efflux from cells" @default.
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• W1967268275 doi "https://doi.org/10.1016/0005-2736(84)90422-x" @default.
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