TITLE

Selective activation of Toll-like receptor 7 in activated hepatic stellate cells may modulate their profibrogenic phenotype

AUTHOR(S)
CHOU, Ming-Huei; HUANG, Ying-Hsien; LIN, Tsun-Mei; DU, Yung-Ying; TSAI, Po-Chin; HSIEH, Chih-Sung; CHUANG, Jiin-Haur
PUB. DATE
October 2012
SOURCE
Biochemical Journal;10/ 1/2012, Vol. 447 Issue 1, p25
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Cholestatic liver injury may activate HSCs (hepatic stellate cells) to a profibrogenic phenotype, contributing to liver fibrogenesis. We have previously demonstrated the involvement of TLR (Tolllike receptor) 7 in the pathogenesis of biliary atresia. In the present study we investigated the ability of TLR7 tomodulate the profibrogenic phenotype in HSCs. Obstructive jaundice was associated with significant down-regulation of TLR7. PrimaryHSCs isolated from BDL (bile duct ligation) rats with obstructive jaundice exhibited reduced expression of TLR7 and increased expression of a-SMA (a-smooth muscle actin) and collagen-a1 compared with sham rats, reflecting HSC-mediated changes. Treatment of primary activated rat HSCs and rat T6 cells with CL075, a TLR7 and TLR8 ligand, significantly decreased expression of MCP-1 (monocyte chemotactic protein-1), TGF-ß1 (transforming growth factor-ß1), collagen-a1 and MMP-2 (matrix metalloproteinase- 2), and inhibited cell proliferation and migration. In contrast, silencing TLR7 expression with shRNA(short hairpinRNA) in T6 cells effectively blocked the effects of CL075 stimulation, reversing the changes in MCP-1, TGF-ß1 and collagen-a1 expression and accelerating cell migration. Our results indicate that obstructive jaundice is associated with down-regulation of TLR7 and upregulation of profibrogenic gene expression in HSCs. Selective activation of TLR7 may modulate the profibrogenic phenotype in activated HSCs associated with cholestatic liver injury.
ACCESSION #
85236309

 

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