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Arteriosclerosis, Thrombosis, and Vascular Biology. 1984;4:248-255

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Arteriosclerosis, Vol 4, 248-255, Copyright © 1984 by American Heart Association

ARTICLES

LDL, scavenger, and beta-VLDL receptors on aortic endothelial cells

DP Baker, BJ Van Lenten, AM Fogelman, PA Edwards, C Kean and JA Berliner

Primary and first passage aortic endothelial cells were shown to possess a high affinity receptor for beta-migrating very low density lipoproteins (beta-VLDL) distinct from the low density lipoprotein (LDL) receptor and scavenger receptor on these cells. In bovine aortic endothelial cells, 125I-rabbit beta-VLDL was taken up and degraded by a high affinity process that was competed for by unlabeled rabbit beta- VLDL and unlabeled postprandial VLDL from a fat-fed normal subject. However, unlabeled human or rabbit LDL, human LDL modified by malondialdehyde (MDA-LDL), or VLDL from a fasted normal human or a rabbit were not effective competitors for the degradation of 125I- rabbit beta-VLDL. In contrast to the receptor-mediated degradation of 125I-human or rabbit LDL and 125I-human-MDA-LDL, cell density did not affect the receptor-mediated degradation of 125I-rabbit beta-VLDL. Endothelial cells from a Watanabe heritable hyperlipidemic (WHHL) rabbit virtually did not degrade rabbit LDL, but degraded rabbit beta- VLDL at a rate equal to that seen in normal rabbit endothelial cells. It was concluded that the beta-VLDL receptor on endothelial cells is genetically distinct from the LDL receptor. Incubation of cells for 3 days with 100 micrograms/ml protein of unlabeled beta-VLDL caused an 88% increase in cellular cholesterol content, even though the beta-VLDL receptor activity was down-regulated by 60%. Endothelial cells and monocyte-macrophages are thus far the only cells known to possess the LDL receptor, the scavenger receptor, and the beta-VLDL receptor.


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