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2007 ; 21
(12
): 3075-82
Nephropedia Template TP
FASEB J
2007[Oct]; 21
(12
): 3075-82
PMID17536039
show ga
Engagement of the receptor for advanced glycation end products (RAGE) by its
signal transduction ligands evokes inflammatory cell infiltration and activation
of the vessel wall. However, soluble RAGE (sRAGE), the truncated form spanning
the extracellular binding domain of RAGE, has potent anti-inflammatory properties
by acting as a decoy for RAGE ligands. We now show that sRAGE binds with high
affinity to atherogenic low-density lipoprotein (LDL) modified by hypochlorous
acid (HOCl), the major oxidant generated by the myeloperoxidase-H2O2-chloride
system of phagocytes activated during inflammation. We further demonstrate that
sRAGE can be coprecipitated with HOCl-LDL from spiked serum. To determine the
functional significance of sRAGE binding to HOCl-LDL, cell association studies
with macrophages were performed. sRAGE effectively inhibited cellular uptake of
HOCl-LDL and subsequent lipid accumulation. Using Chinese hamster ovary cells
overexpressing class B scavenger receptor CD36 or SR-BI, two preferential
scavenger receptors for HOCl-LDL, we demonstrate that sRAGE only interferes with
CD36-mediated uptake of HOCl-LDL. The present findings indicate that sRAGE acts
as a sink for HOCl-LDL, which is abundantly present in human atherosclerotic
lesions. We propose that sRAGE represents a physiological antagonist that
interferes with scavenger receptor-mediated cholesterol accumulation and foam
cell formation of macrophages.
|Animals
[MESH]
|Atherosclerosis/metabolism/pathology
[MESH]
|Cell Line
[MESH]
|Cricetinae
[MESH]
|Cricetulus
[MESH]
|Glycation End Products, Advanced/metabolism
[MESH]
|Humans
[MESH]
|Hypochlorous Acid/*metabolism
[MESH]
|Lipoproteins, LDL/*metabolism
[MESH]
|Macrophages/cytology/metabolism
[MESH]
|Mice
[MESH]
|Oxidants/*metabolism
[MESH]
|Peptide Fragments/genetics/*metabolism
[MESH]
|Protein Binding
[MESH]
|Receptor for Advanced Glycation End Products
[MESH]