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Obeticholic acid prevents carbon tetrachloride-induced liver fibrosis through interaction between farnesoid X receptor and Smad3.

Abstract：

:Liver fibrosis results from sustained liver injury and is characterized by inflammation, hepatic stellate cell (HSC) activation, extracellular matrix (ECM) accumulation and liver structure destruction. The Farnesoid-X receptor (FXR) antagonizes toxic liver injury and fibrosis, yet the mechanism in liver fibrosis remains unclear. We investigated the effects of FXR agonist obeticholic acid (OCA) on liver fibrosis in mice. Mice were injected with carbon tetrachloride (CCl4) for 3 weeks or 6 weeks to induce liver fibrosis. OCA (5 mg/kg) or PBS is administered daily during CCl4-treatment. At sacrifice, biochemical parameters and fibrosis were assessed. Pretreatment with OCA alleviated hepatic injury in 6 weeks group but not in 3 weeks group of CCl4 liver cirrhosis. At same time, pretreatment with OCA exhibit a dramatic protection of liver fibrosis in both 3 weeks group and 6 weeks group. Further experiments found that OCA pretreatment inhibited α-SMA expression and the activation of hepatic pSmad3 in 3 weeks group and 6 weeks group of CCl4-induced liver cirrhosis. Moreover, OCA activated FXR nuclear translocation and increased the interaction between liver FXR and pSmad3. This led to the discovery of a novel role for FXR in regulating fibrosis through interaction with pSmad3. Our data suggest that CCl4-induced liver fibrosis is protected by OCA through interaction between farnesoid X receptor and Smad3.

journal_name

Int Immunopharmacol

journal_title

International immunopharmacology

authors

Fan YY,Ding W,Zhang C,Fu L,Xu DX,Chen X

doi

10.1016/j.intimp.2019.105911

subject

Has Abstract

pub_date

2019-12-01 00:00:00

pages

105911

eissn

1567-5769

issn

1878-1705

pii

S1567-5769(19)31547-4

journal_volume

77

pub_type

杂志文章

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