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2007 ; 21
(4
): 1145-52
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gab.com Text
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Hypochlorite-modified albumin colocalizes with RAGE in the artery wall and
promotes MCP-1 expression via the RAGE-Erk1/2 MAP-kinase pathway
#MMPMID17218539
Marsche G
; Semlitsch M
; Hammer A
; Frank S
; Weigle B
; Demling N
; Schmidt K
; Windischhofer W
; Waeg G
; Sattler W
; Malle E
FASEB J
2007[Apr]; 21
(4
): 1145-52
PMID17218539
show ga
Signal transduction via the endothelial receptor for advanced glycation end
products (RAGE) plays a key role in vascular inflammation. Recent observations
have shown that the myeloperoxidase-H2O2-chloride system of activated phagocytes
is highly up-regulated under inflammatory conditions where hypochlorous acid
(HOCl) is formed as the major oxidant. Albumin, an in vivo carrier for
myeloperoxidase is highly vulnerable to oxidation and a major representative of
circulating advanced oxidized proteins during inflammatory diseases.
Immunohistochemical studies performed in the present study revealed marked
colocalization of HOCl-modified epitopes with RAGE and albumin in sections of
human atheroma, mainly at the endothelial lining. We show that albumin modified
with physiologically relevant concentrations of HOCl, added as reagent or
generated by the myeloperoxidase-H2O2-chloride system, is a high affinity ligand
for RAGE. Albumin, modified by HOCl in the absence of free amino
acids/carbohydrates/lipids to exclude formation of AGE-like structures, induced a
rapid, RAGE-dependent activation of extracellular signal-regulated kinase 1/2 and
up-regulation of the proinflammatory mediator monocyte chemoattractant protein-1.
Cellular activation could be blocked either by a specific polyclonal anti-RAGE
IgG and/or a specific mitogen-activated protein-kinase kinase inhibitor. The
present study demonstrates that HOCl-modified albumin acts as a ligand for RAGE
and promotes RAGE-mediated inflammatory complications.
|*Gene Expression Regulation
[MESH]
|*Inflammation
[MESH]
|Albumins/*chemistry
[MESH]
|Arteries/*metabolism
[MESH]
|Cell Line
[MESH]
|Chemokine CCL2/*biosynthesis
[MESH]
|Humans
[MESH]
|Hypochlorous Acid/*pharmacology
[MESH]
|MAP Kinase Signaling System
[MESH]
|Mitogen-Activated Protein Kinase 1/metabolism
[MESH]
|Mitogen-Activated Protein Kinase 3/metabolism
[MESH]
|Peroxidase/*metabolism
[MESH]
|Receptor for Advanced Glycation End Products
[MESH]