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Liver X receptor inhibits the growth of hepatocellular carcinoma cells via regulating HULC/miR-134-5p/FOXM1 axis.

Abstract：

:Hepatocellular carcinoma (HCC) is one of the most common malignancies with a high rate of mortality. Highly upregulated in liver cancer (HULC), the specifically overexpressed long non-coding RNA in human HCC, plays important roles in promoting the growth and metastasis of HCC cells. So downregulating HULC will be benefit to HCC treatment. The nuclear receptor LXR (liver X receptor), consist of α and β isoforms, exerts significant anti-HCC effects, but the corresponding mechanisms are not well known, especially, it's unclear whether LXR is involved in the regulation of HULC. In this study, we found that LXR inhibited HCC cell growth by downregulating HULC, and LXRα (but not LXRβ) caused HULC downregulation. Luciferase reporter assays showed that LXR suppressed transcriptional activity of HULC gene promoter, and chromatin immunoprecipitation assays revealed that LXRα (but not LXRβ) bound to HULC promoter region. Furthermore, LXR increased miR-134-5p while decreased FOXM1 by reducing HULC. Additionally, HULC upregulated FOXM1 via sequestrating miR-134-5p, and miR-134-5p downregulated FOXM1 by targeting 3'-UTR of its mRNA. The in vivo experiments showed that LXR repressed the growth of HCC xenografts, and decreased HULC and FOXM1 while increased miR-134-5p in the xenografts. In summary, these findings for the first time demonstrate that LXR inhibits HCC cell growth by modulating HULC/miR-134-5p/FOXM1 axis, suggesting that the pathway LXR/HULC/miR-134-5p/FOXM1 may serve as a novel target for HCC treatment.

journal_name

Cell Signal

journal_title

Cellular signalling

authors

He J,Yang T,He W,Jiang S,Zhong D,Xu Z,Wei Q,Zhang Y,Shi C

doi

10.1016/j.cellsig.2020.109720

subject

Has Abstract

pub_date

2020-10-01 00:00:00

pages

109720

eissn

0898-6568

issn

1873-3913

pii

S0898-6568(20)30197-2

journal_volume

74

pub_type

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