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• W2056404423 abstract "The uptake and transport of cholesterol-carrying low density lipoprotein (LDL) by the arterial wall is a continuous dynamic process, contributing to the cholesterol homeostasis in the plasma and in the cellular components of the vessel wall. Upon exposure to endothelial cells (EC), LDL interacts in part, with specific surface receptors (LDL-R). In this study we questioned: (i) the distribution of LDL receptors on the apical and basal cell membranes in endothelial cells; (ii) the role of LDL receptors in the control of cholesterol homeostasis and (iii) the translocation of LDL receptor across the EC. To this purpose bovine aortic EC were cultured on filters in a double-chamber system, in Dulbecco's medium supplemented either with 10% fetal calf serum (FCS) or with 10% lipoprotein-deficient serum (LPDS). The cells were exposed for 3h to 13H]acetate (40 microCi) added to both compartments of the cell culture inserts. The newly synthesized [3H]cholesterol was detected by thin layer chromatography and quantified by liquid scintillation counting. The LDL-R were detected in EC protein homogenates by immunoblotting using a monoclonal antibody against LDL-R (IgG-C7); the intracellular pathway of LDL-R was examined by electron microscopy using a complex made of protein A 5 nm or 20 nm colloidal gold particles and an anti-LDL receptor antibody (Au-PA-C7). To evaluate the distribution and the transport of LDL-R from one cell surface to the other, EC grown in LPDS were radioiodinated either on the apical or on the basolateral surface, incubated on the same surface with LDL, and subsequently biotinylated on the opposite non-radiolabeled surface. The EC were further solubilized and the protein extract immunoprecipitated with anti-LDL-R antibody or with mouse IgG (as control). The eluted antigen-antibody complexes were precipitated with streptavidin-agarose beads, solubilized, and subjected to SDS-PAGE. The results showed that: (a) the LDL-R were present on both endothelial cell fronts; (b) using the complex Au-PA-C7, the LDL-R were localized in endothelial plasmalemmal vesicles as well as coated pits and coated vesicles in multivesicular bodies and lysosomes, irrespective of the cell surface exposed to the complex; (c) biochemical assays indicated that upon ligand binding, the LDL-R were translocated preferentially from the apical to the basal plasma membrane." @default.
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• W2056404423 date "1999-06-01" @default.
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• W2056404423 title "Low density lipoprotein binding induces asymmetric redistribution of the low density lipoprotein receptors in endothelial cells" @default.
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• W2056404423 doi "https://doi.org/10.1016/s0171-9335(99)80083-1" @default.
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