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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Autoimmun
2015 ; 63
(ä): 76-87
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Treatment of cholestatic fibrosis by altering gene expression of Cthrc1:
Implications for autoimmune and non-autoimmune liver disease
#MMPMID26238209
Bian Z
; Miao Q
; Zhong W
; Zhang H
; Wang Q
; Peng Y
; Chen X
; Guo C
; Shen L
; Yang F
; Xu J
; Qiu D
; Fang J
; Friedman S
; Tang R
; Gershwin ME
; Ma X
J Autoimmun
2015[Sep]; 63
(ä): 76-87
PMID26238209
show ga
Collagen triple helix repeat containing-1 (Cthrc1) is a documented specific
inhibitor of TGF-? signaling. Based on this observation, we developed the
hypothesis that knocking in/knocking out the Cthrc1 gene in murine models of
cholestasis would alter the natural history of cholestatic fibrosis. To study
this thesis, we studied two murine models of fibrosis, first, common bile duct
ligation (CBDL) and second, feeding of 3, 5-diethoxy-carbonyl-1,
4-dihydrocollidine (DDC). In both models, we administered well-defined adenoviral
vectors that expressed either Cthrc1 or, alternatively, a short hairpin RNA
(shRNA)-targeting Cthrc1 either before or after establishment of fibrosis.
Importantly, when Cthrc1 gene expression was enhanced, we noted a significant
improvement of hepatic fibrosis, both microscopically and by analysis of fibrotic
gene expression. In contrast, when Cthrc1 gene expression was deleted, there was
a significant exacerbation of fibrosis. To identify the mechanism of action of
these significant effects produced by knocking in/knocking out Cthrc gene
expression, we thence studied the interaction of Cthrc1 gene expression using
hepatic stellate cells (HSCs) and human LX-2 cells. Importantly, we demonstrate
that Cthrc1 is induced by TGF-?1 via phospho-Smad3 binding to the promoter with
subsequent transcription activation. In addition, we demonstrate that Cthrc1
inhibits TGF-? signaling by accelerating degradation of phospho-Smad3 through a
proteosomal pathway. Importantly, the anti-fibrotic effects can be recapitulated
with a truncated fragment of Cthrc1. In conclusion, our findings uncover a
critical negative feedback regulatory loop in which TGF-?1 induces Cthrc1, which
can attenuate fibrosis by accelerating degradation of phospho-Smad3.