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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+Immunol
2014 ; 193
(8
): 3925-33
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IL-17A enhances the expression of profibrotic genes through upregulation of the
TGF-? receptor on hepatic stellate cells in a JNK-dependent manner
#MMPMID25210118
Fabre T
; Kared H
; Friedman SL
; Shoukry NH
J Immunol
2014[Oct]; 193
(8
): 3925-33
PMID25210118
show ga
Activation of hepatic stellate cells (HSCs) is a key event in the initiation of
liver fibrosis, characterized by enhanced extracellular matrix production and
altered degradation. Activation of HSCs can be modulated by cytokines produced by
immune cells. Recent reports have implicated the proinflammatory cytokine IL-17A
in liver fibrosis progression. We hypothesized that IL-17A may enhance activation
of HSCs and induction of the fibrogenic signals in these cells. The human HSC
line LX2 and primary human HSCs were stimulated with increasing doses of IL-17A
and compared with TGF-?- and PBS-treated cells as positive and negative controls,
respectively. IL-17A alone did not induce activation of HSCs. However, IL-17A
sensitized HSCs to the action of suboptimal doses of TGF-? as confirmed by strong
induction of ?-smooth muscle actin, collagen type I (COL1A1), and tissue
inhibitor of matrix metalloproteinase I gene expression and protein production.
IL-17A specifically upregulated the cell surface expression of TGF-?RII following
stimulation. Pretreatment of HSCs with IL-17A enhanced signaling through TGF-?RII
as observed by increased phosphorylation of SMAD2/3 in response to stimulation
with suboptimal doses of TGF-?. This enhanced TGF-? response of HSCs induced by
IL-17A was JNK-dependent. Our results suggest a novel profibrotic function for
IL-17A by enhancing the response of HSCs to TGF-? through activation of the JNK
pathway. IL-17A acts through upregulation and stabilization of TGF-?RII, leading
to increased SMAD2/3 signaling. These findings represent a novel example of
cooperative signaling between an immune cytokine and a fibrogenic receptor.