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2017 ; 7
(1
): 2660
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gab.com Text
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VEGF-A Stimulates STAT3 Activity via Nitrosylation of Myocardin to Regulate the
Expression of Vascular Smooth Muscle Cell Differentiation Markers
#MMPMID28572685
Liao XH
; Xiang Y
; Li H
; Zheng L
; Xu Y
; Xi Yu C
; Li JP
; Zhang XY
; Xing WB
; Cao DS
; Bao LY
; Zhang TC
Sci Rep
2017[Jun]; 7
(1
): 2660
PMID28572685
show ga
Vascular endothelial growth factor A (VEGF-A) is a pivotal player in
angiogenesis. It is capable of influencing such cellular processes as
tubulogenesis and vascular smooth muscle cell (VSMC) proliferation, yet very
little is known about the actual signaling events that mediate VEGF-A induced
VSMC phenotypic switch. In this report, we describe the identification of an
intricate VEGF-A-induced signaling cascade that involves VEGFR2, STAT3, and
Myocardin. We demonstrate that VEGF-A promotes VSMC proliferation via
VEGFR2/STAT3-mediated upregulating the proliferation of markers like Cyclin D1
and PCNA. Specifically, VEGF-A leads to nitrosylation of Myocardin, weakens its
effect on promoting the expression of contractile markers and is unable to
inhibit the activation of STAT3. These observations reinforce the importance of
nitric oxide and S-nitrosylation in angiogenesis and provide a mechanistic
pathway for VEGF-A-induced VSMC phenotypic switch. In addition, Myocardin, GSNOR
and GSNO can create a negative feedback loop to regulate the VSMC phenotypic
switch. Thus, the discovery of this interactive network of signaling pathways
provides novel and unexpected therapeutic targets for angiogenesis-dependent
diseases.