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2015 ; 6
(14
): 12224-33
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gab.com Text
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English Wikipedia
Identification of a novel TGF-?-miR-122-fibronectin 1/serum response factor
signaling cascade and its implication in hepatic fibrogenesis
#MMPMID25909171
Zeng C
; Wang YL
; Xie C
; Sang Y
; Li TJ
; Zhang M
; Wang R
; Zhang Q
; Zheng L
; Zhuang SM
Oncotarget
2015[May]; 6
(14
): 12224-33
PMID25909171
show ga
Transforming growth factor-? (TGF-?) is a potent cytokine that promotes the
development of fibrogenic cells, stimulates the expression of fibrosis-related
genes, and consequently results in hepatic fibrogenesis. The involvement of
miRNAs in this process remains largely unknown. We showed that miR-122 was
substantially expressed in hepatic stellate cells (HSCs) and fibroblasts, the
major sources of fibrogenic cells in liver tissues. Notably, exposure to TGF-?
led to significant downregulation of miR-122. Furthermore, reintroduction of
miR-122 suppressed TGF-?-induced expression of fibrosis-related genes, including
alpha smooth muscle actin (?-SMA), fibronectin 1 (FN1) and ?1 type I collagen
(COL1A1), in HSCs and fibroblasts. Subsequent mechanism investigations revealed
that miR-122 directly inhibited FN1 expression by binding to its 3'-untranslated
region and indirectly reduced the transcription of ?-SMA and COL1A1 by inhibiting
the expression of serum response factor (SRF), a key transcription factor that
mediated the activation of fibrogenic cells. Further in vivo studies disclosed
that intravenous injection of miR-122-expressing lentivirus successfully
increased miR-122 level and reduced the amount of collagen fibrils, FN1 and SRF
in the livers of CCl4-treated mice. These findings disclose a novel
TGF-?-miR-122-FN1/SRF signaling cascade and its implication in hepatic
fibrogenesis, and suggest miR-122 as a promising molecular target for
anti-fibrosis therapy.