The SLC34A2-ROS-HIF-1-induced up-regulation of EZH2 expression promotes proliferation and chemo-resistance to apoptosis in colorectal cancer.

Abstract:

:Growing evidence has uncovered that SLC34A2 plays an evident role in the progression in several types of tumors. However, the biological function and underlying molecular mechanisms of SLC34A2 remain largely unknown. Here, we indicated that SLC34A2 expression was markedly increased in SW480 and HT29 cell line cells compared with that in normal colorectal epithelial cell line cells. Array analysis displayed that the expression of enhancer of zeste 2 (EZH2) decreased considerably when SLC34A2 was knocked down. We demonstrated that SLC34A2 induced EZH2 expression and activated its promoter activity. Serial 5' deletion and site-directed mutagenesis revealed that the induction of EZH2 expression by SLC34A2 was dependent upon the hypoxia-inducible factor 1 (HIF-1)-2 binding site directly within EZH2 promoter. Moreover, HIF-1 activation was proved essential for SLC34A2-induced EZH2 expression. Reactive oxygen species (ROS) generation contributed to the stabilization of HIF-1α by leading to the binding of HIF-1α to the EZH2 promoter, which resulted in increased EZH2 expression. Additionally, we showed that the inhibition of both HIF-1α expression and ROS generation by YC-1 or BHA, respectively, decreased SLC34A2-induced EZH2 overexpression. Significantly, SLC34A2-induced EZH2 overexpression promoted the proliferation and chemo-resistance to apoptosis in colorectal cancer (CRC) cells in vitro and in vivo Altogether, we conclude that the SLC34A2-ROS-HIF-1-induced overexpression of EZH2 promotes CRC cells proliferation and chemo-resistance to apoptosis. SLC34A2-ROS-HIF-1-EZH2 signaling pathway might serve as a novel therapeutic target against CRC.

journal_name

Biosci Rep

journal_title

Bioscience reports

authors

Li X,Xing J,Wang H,Yu E

doi

10.1042/BSR20180268

subject

Has Abstract

pub_date

2019-05-21 00:00:00

issue

5

eissn

0144-8463

issn

1573-4935

pii

BSR20180268

journal_volume

39

pub_type

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