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2017 ; 7
(1
): 3296
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DC-SIGN and Toll-like receptor 4 mediate oxidized low-density lipoprotein-induced
inflammatory responses in macrophages
#MMPMID28607410
Yang K
; Liu X
; Liu Y
; Wang X
; Cao L
; Zhang X
; Xu C
; Shen W
; Zhou T
Sci Rep
2017[Jun]; 7
(1
): 3296
PMID28607410
show ga
The regulation of inflammatory responses by innate immune receptors is recognized
as a crucial step in the development of atherosclerosis, although the precise
molecular mechanisms remain to be elucidated. This study focused on illustrating
the roles of dendritic cell-specific intercellular adhesion molecule-3-grabbing
non-integrin (DC-SIGN)- and Toll-like receptor 4 (TLR4)-regulated inflammatory
responses in macrophages. We found that DC-SIGN expression levels were increased
in macrophages of atherosclerotic plaques. Oxidized low-density lipoprotein
(oxLDL) significantly enhanced DC-SIGN protein expression levels after a
short-term exposure. Knockdown of DC-SIGN decreased expression and secretion of
interleukin 1-? (IL1-?), monocyte chemo-attractant protein 1 (MCP-1), tumor
necrosis factor-? (TNF?) and matrix metalloproteinase-9 (MMP-9).
Immunofluorescence studies demonstrated that DC-SIGN and TLR4 co-localized in
regions of the plaques. Moreover, DC-SIGN was co-expressed with TLR4 on the
plasma membrane after oxLDL stimulation. The presence of an endogenous
interaction and the results of the in vitro pull-down assays revealed that
DC-SIGN binds directly with TLR4. We also present evidence that DC-SIGN mediates
TLR4-regulated NF?B activation but not activation of p38 and JNK. Our results
suggest an essential role of DC-SIGN/TLR4 signaling in macrophages in the
pathogenesis of atherosclerosis.