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2018 ; 9
(ä): 765
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Src Plays an Important Role in AGE-Induced Endothelial Cell Proliferation,
Migration, and Tubulogenesis
#MMPMID29977209
Li P
; Chen D
; Cui Y
; Zhang W
; Weng J
; Yu L
; Chen L
; Chen Z
; Su H
; Yu S
; Wu J
; Huang Q
; Guo X
Front Physiol
2018[]; 9
(ä): 765
PMID29977209
show ga
Advanced glycation end products (AGEs), produced by the non-enzymatic glycation
of proteins and lipids under hyperglycemia or oxidative stress conditions, has
been implicated to be pivotal in the development of diabetic vascular
complications, including diabetic retinopathy. We previously demonstrated that
Src kinase played a causative role in AGE-induced hyper-permeability and barrier
dysfunction in human umbilical vein endothelial cells (HUVECs). While the
increase of vascular permeability is the early event of angiogenesis, the effect
of Src in AGE-induced angiogenesis and the mechanism has not been completely
revealed. Here, we investigated the impact of Src on AGE-induced HUVECs
proliferation, migration, and tubulogenesis. Inhibition of Src with inhibitor PP2
or siRNA decreased AGE-induced migration and tubulogenesis of HUVECs. The
inactivation of Src with pcDNA3/flag-Src(K298M) also restrained AGE-induced
HUVECs proliferation, migration, and tube formation, while the activation of Src
with pcDNA3/flag-Src(Y530F) enhanced HUVECs angiogenesis alone and exacerbated
AGE-induced angiogenesis. AGE-enhanced HUVECs angiogenesis in vitro was
accompanied with the phosphorylation of ERK in HUVECs. The inhibition of ERK with
its inhibitor PD98059 decreased AGE-induced HUVECs angiogenesis. Furthermore, the
inhibition and silencing of Src suppressed the AGE-induced ERK activation. And
the silencing of AGEs receptor (RAGE) inhibited the AGE-induced ERK activation
and angiogenesis as well. In conclusions, this study demonstrated that Src plays
a pivotal role in AGE-promoted HUVECs angiogenesis by phosphorylating ERK, and
very likely through RAGE-Src-ERK pathway.