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Original Article |
Correspondence to: Stephen C. Meredith
Apolipoprotein E plays a critical role in plasma lipoprotein clearance. Peptide models of a highly conserved, N-terminal domain of this protein have been shown to increase the binding of low density lipoprotein (LDL) to fibroblast cell surfaces independently of the low density lipoprotein receptor. Here we provide data to show that these peptides not only increase the binding of LDL, but also of high density lipoprotein, though not acetylated LDL. We also have data suggesting that this novel activity is mediated, at least in part, by a member of the scavenger receptor family, SR-AI. Furthermore, we show that this activity is also prominent in macrophages, a cell relevant to atherogenesis. In addition, this current paper provides evidence suggesting that this complex binding activity is initiated by a peptidereceptor interaction, and that our peptides are able to induce activity at physiologically relevant concentrations. This study provides evidence for a possible novel receptor interaction and further anti-atherogenic properties of apolipoprotein E and raises the possibility of a therapeutic potential of our peptide models.Dominguez, S. R., H. Miller-Auer, C. A. Reardon, and S. C. Meredith. Peptide model of a highly conserved, N-terminal domain of apolipoprotein E is able to modulate lipoprotein binding to a member of the class A scavenger receptor family. J. Lipid Res. 1999. 40: 753763.
Supplementary key words: apolipoprotein E, peptide models, lipoproteins, LDL, HDL, scavenger receptors
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V. Raussens, M. K. H. Mah, C. M. Kay, B. D. Sykes, and R. O. Ryan Structural Characterization of a Low Density Lipoprotein Receptor-active Apolipoprotein E Peptide, ApoE3-(126-183) J. Biol. Chem., December 1, 2000; 275(49): 38329 - 38336. [Abstract] [Full Text] [PDF] |
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