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- W1978961657 abstract "The present study has focused on three questions concerning the effect of sphingomyelinase on release of free cholesterol from the plasma membrane and its intracellular translocation: (i) Can one change the direction of the flow of cholesterol? (ii) Can one modulate the flow? (iii) May such a mechanism be relevant in atherogenesis? (i) The results obtained show that even in the presence of potent nonlipoprotein cholesterol acceptors in the medium, the intracellular flow of cholesterol is not reduced as measured by cholesterol esterification. Moreover, in sphingomyelinase-treated cells, cholesterol efflux in presence of nonlipoprotein acceptors was not enhanced even when intracellular esterification was inhibited. (ii) Modulation of the sphingomyelinase induced cholesterol flow can be obtained by 100 microM verapamil which reduces it. In human skin fibroblast, interference with the delivery of free cholesterol to its site of esterification was found in the presence of brefeldin A. (iii) Aortic smooth muscle cells in culture are sensitive to low concentrations of sphingomyelinase and the increase in esterified cholesterol is evident also after exposure to the enzyme for 24 h. The present results suggest that in the plasma membrane, free cholesterol bound to sphingomyelin may be in a compartment which renders it more available for transport to the cell interior than for efflux. In view of the sensitivity of aortic smooth muscle cells to sphingomyelinase, this mechanism for enhanced esterification of cholesterol could be relevant to the transformation of arterial smooth muscle cells into foam cells in the process of atherogenesis." @default.
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- W1978961657 date "1992-06-01" @default.
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- W1978961657 title "Modulation of sphingomyelinase-induced cholesterol esterification in fibroblasts, CaCo2 cells, macrophages and smooth muscle cells" @default.
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- W1978961657 doi "https://doi.org/10.1016/0005-2760(92)90243-o" @default.
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