Inhibiting Wnt Signaling Reduces Cholestatic Injury by Disrupting the Inflammatory Axis

DOI

10.1016/j.jcmgh.2023.08.004

Document Type

Journal Article

Publication Date

1-1-2023

Publication Title

Cellular and Molecular Gastroenterology and Hepatology

Volume

16

Issue

6

First Page

895

Last Page

921

Keywords

Bile Acids, Cholangiocytes, Farnesoid X Receptor, Nuclear Factor Kappa κB, β-catenin

Abstract

Background & Aims: β-Catenin, the effector molecule of the Wnt signaling pathway, has been shown to play a crucial role in bile acid homeostasis through direct inhibition of farnesoid X receptor (FXR), which has pleiotropic effects on bile acid homeostasis. We hypothesize that simultaneous suppression of β-catenin signaling and activation of FXR in a mouse model of cholestasis will reduce injury and biliary fibrosis through inhibition of bile acid synthesis. Methods: To induce cholestasis, we performed bile duct ligation (BDL) on wild-type male mice. Eight hours after surgery, mice received FXR agonists obeticholic acid, tropifexor, or GW-4064 or Wnt inhibitor Wnt-C59. Severity of cholestatic liver disease and expression of target genes were evaluated after either 5 days or 12 days of treatment. Results: We found that although the FXR agonists worsened BDL-induced injury and necrosis after 5 days, Wnt-C59 did not. After 12 days of BDL, Wnt-C59 treatment, but not GW-4064 treatment, reduced both the number of infarcts and the number of inflammatory cells in liver. RNA sequencing analysis of whole livers revealed a notable suppression of nuclear factor kappa B signaling when Wnt signaling is inhibited. We then analyzed transcriptomic data to identify a cholangiocyte-specific signature in our model and demonstrated that Wnt-C59–treated livers were enriched for genes expressed in quiescent cholangiocytes, whereas genes expressed in activated cholangiocytes were enriched in BDL alone. A similar decrease in biliary injury and inflammation occurred in Mdr2 KO mice treated with Wnt-C59. Conclusions: Inhibiting Wnt signaling suppresses cholangiocyte activation and disrupts the nuclear factor kappa B–dependent inflammatory axis, reducing cholestatic-induced injury.

Open Access

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