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2015 ; 10
(4
): e0123724
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English Wikipedia
Rosiglitzone suppresses angiotensin II-induced production of KLF5 and cell
proliferation in rat vascular smooth muscle cells
#MMPMID25874449
Gao D
; Hao G
; Meng Z
; Ning N
; Yang G
; Liu Z
; Dong X
; Niu X
PLoS One
2015[]; 10
(4
): e0123724
PMID25874449
show ga
Krüppel-like factor (KLF) 5, which initiates vascular smooth muscle cell (VSMC)
proliferation, also participates in Angiotensin (Ang) II-induced vascular
remodeling. The protective effect of rosiglitazone on vascular remodeling may be
due to their impact on VSMC proliferation. However, the underlying mechanisms
involved remain unclear. This study was designed to investigate whether the
antiproliferation effects of rosiglitazone are mediated by regulating Ang II/KLF5
response. We found that, in aortas of Ang II-infused rats, vascular remodeling
and KLF5 expression were markedly increased, and its target gene cyclin D1 was
overexpressed. Co-treatment with rosiglitazone diminished these changes. In
growth-arrested VSMCs, PPAR-? agonists (rosiglitazone and 15d-PGJ2)
dose-dependently inhibited Ang II-induced cell proliferation and expression of
KLF5 and cyclin D1. Moreover, these effects were attenuated by the PPAR-?
antagonists GW9662, bisphenol A diglycidyl ether and PPAR-? specific siRNA.
Furthermore, rosiglitazone inhibited Ang II-induced phosphorylation of protein
kinase C (PKC) ? and extracellular signal-regulated kinase (ERK) 1/2 and
activation of early growth response protein (Egr). In conclusion, in Ang
II-stimulated VSMCs, rosiglitazone might have an antiproliferative effect through
mechanisms that include reducing KLF5 expression, and a crosstalk between PPAR-?
and PKC?/ERK1/2/Egr may be involved in. These findings not only provide a
previously unrecognized mechanism by which PPAR-? agonists inhibit VSMC
proliferation, but also document a novel evidence for the beneficial vascular
effect of PPAR-? activation.