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lüll Cell cholesterol efflux: integration of old and new observations provides new insights Rothblat GH; de la Llera-Moya M; Atger V; Kellner-Weibel G; Williams DL; Phillips MCJ Lipid Res 1999[May]; 40 (5): 781-96Numerous studies using a variety of cell/acceptor combinations have demonstrated differences in cholesterol efflux among cells. These studies also show that different acceptors, ranging from simple molecules like cyclodextrins to serum, stimulate efflux through a variety of mechanisms. By combining early observations with data derived from recent studies, it is now possible to formulate a model for cell cholesterol efflux which proposes that an array of different mechanisms, including aqueous diffusion, lipid-free apolipoprotein membrane microsolubilization, and SR-BI-mediated cholesterol exchange contribute to cholesterol flux. In this model the relative importance of each mechanism would be determined both by the cell type and the nature of the extracellular cholesterol acceptor.|*Membrane Proteins[MESH]|*Receptors, Immunologic[MESH]|Animals[MESH]|Apolipoproteins/metabolism[MESH]|Biological Transport, Active[MESH]|CD36 Antigens/metabolism[MESH]|Cell Membrane/metabolism[MESH]|Cholesterol/blood/*metabolism[MESH]|Cyclodextrins/metabolism[MESH]|Humans[MESH]|Kinetics[MESH]|Lipoproteins, HDL/metabolism[MESH]|Models, Biological[MESH]|Phospholipids/metabolism[MESH]|Receptors, Lipoprotein/metabolism[MESH]|Receptors, Scavenger[MESH]|Scavenger Receptors, Class B[MESH] |