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2016 ; 8
(8
): 3460-70
Nephropedia Template TP
gab.com Text
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English Wikipedia
Peroxisome proliferator-activated receptor-? agonist troglitazone suppresses
transforming growth factor-?1 signalling through miR-92b upregulation-inhibited
Axl expression in human keloid fibroblasts in vitro
#MMPMID27648136
Zhu HY
; Bai WD
; Li J
; Tao K
; Wang HT
; Yang XK
; Liu JQ
; Wang YC
; He T
; Xie ST
; Hu DH
Am J Transl Res
2016[]; 8
(8
): 3460-70
PMID27648136
show ga
Keloid, a skin benign tumor, is characterized by overgrowth of fibroblasts and
the excessive deposition of extracellular matrix in wounded skin. Peroxisome
proliferator-activated receptor-? (PPAR-?) agonist was recently evaluated to
inhibit fibrosis. This study explored the underlying mechanisms. Fibroblasts
isolated from 25 keloid patients (KFs) and fibroblasts isolated from healthy
controls (NSFBs) were also subjected to treatment with PPAR-? agonist
troglitazone and antagonist GW9662 or for transfection with miR-92 mimics or
inhibitor, Axl siRNA, and miR-92b or Axl promoter constructs, as well as being
subjected to qRT-PCR, ELISA, Western blot, protein array, luciferase, and ChIP
assays. The data demonstrated that TGF-?1 and Axl proteins were significantly
elevated in samples from keloid patients, while troglitazone treatment
significantly reduced levels of TGF-?1 and Axl mRNA and proteins in KFs.
Moreover, knockdown of Axl expression reduced expression of TGF-?1 and its
pathway genes (such as ?-SMA and Snail). PPAR-? regulation of Axl expression was
through transcriptional activation of miR-92b. miR-92b expression downregulated
Axl expression at both mRNA and protein levels, whereas GW9662 completely
reversed the inhibitory effects of miR-92b mimics on Axl expression. Gene
ontology analysis of miR-92b targeting genes showed that TGF-? and Axl were both
potential targets of miR-92b, as confirmed by luciferase assay. These findings
demonstrated that PPAR-?-induced miR-92b expression inhibited Axl expression and
in turn reduced expression of TGF-?1 and the downstream genes in KFs, suggesting
that targeting of this novel gene pathway may be useful for therapeutic control
of fibrosis or keloid.