Effects and mechanism of the bile acid (farnesoid X) receptor on the Wnt/β-catenin signaling pathway in colon cancer.

Abstract:

:The downregulation of farnesoid X receptor (FXR; gene name, nuclear receptor subfamily 1 group h member 4), an enteric nuclear bile acid receptor, has been reported in colorectal carcinoma (CRC), and FXR expression has been inversely correlated with CRC stage and clinical outcome. FXR knockdown in chronic colitis mouse models of intestinal tumorigenesis results in early mortality and increased tumor progression via promoting Wnt signaling. The aim of the present study was to explore the effects and mechanism of FXR on the Wnt/β-catenin signal pathway in CRC. FXR and β-catenin protein expression levels were detected in an ulcerative colitis mouse model and human colon cancer cell lines (HT-29, Caco-2 and HCT-116). Gain- and loss-of-function studies were conducted by transfecting colon cancer cells with FXR siRNA and treating them with the FXR agonist GW4064. Subsequently, β-catenin transcriptional activity was measured using the dual-luciferase assay, and β-catenin/TCF4 complex levels and β-catenin protein and mRNA expression levels were determined. FXR and β-catenin expression levels were inversely associated in both the animal model and colon cancer cells. The Wnt signaling pathway was activated by increased β-catenin/TCF4 complex levels upon FXR silencing; however, mRNA and protein levels of β-catenin were not significantly affected. The FXR agonist GW4064 significantly inhibited the proliferation of cells but promoted the transcriptional activity of β-catenin. Thus, the present study demonstrated that FXR influences the Wnt/β-catenin signaling pathway. Furthermore, loss of FXR expression promotes the transcriptional activity of β-catenin, whereas FXR activation results in the opposite effect.

journal_name

Oncol Lett

journal_title

Oncology letters

authors

Mao J,Chen X,Wang C,Li W,Li J

doi

10.3892/ol.2020.11545

subject

Has Abstract

pub_date

2020-07-01 00:00:00

pages

337-345

issue

1

eissn

1792-1074

issn

1792-1082

pii

OL-0-0-11545

journal_volume

20

pub_type

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