The RNA-Binding Protein HuR Confers Oxaliplatin Resistance of Colorectal Cancer By Upregulating CDC6.

Abstract:

:Human antigen R (HuR) is an RNA-binding protein that posttranscriptionally regulates many cancer-trait genes. CDC6, a central regulator of DNA replication, is regulated by HuR. In this study, we investigated the role of HuR in colorectal cancer tumorigenesis and oxaliplatin (L-OHP) resistance, as well as the underlying mechanisms involving CDC6. We detected increased HuR and CDC6 expression, along with a positive correlation between the two in human colorectal cancer tissues. HuR overexpression increased colorectal cancer cell proliferation in vitro and xenograft tumor growth in vivo, and induced resistance to L-OHP. In contrast, HuR knockdown sensitized colorectal cancer cells to L-OHP. CDC6 overexpression increased while CDC6 knockdown decreased colorectal cancer cell malignant behaviors (growth, DNA synthesis, EMT, migration, and invasion) and L-OHP resistance in vitro Moreover, L-OHP resistance induced by HuR overexpression was reversed by CDC6 knockdown. Mechanistically, the results from our luciferase reporter and ribonucleoprotein immunoprecipitation assays indicated that HuR upregulates CDC6 by binding to CDC6 3'-UTR. Taken together, our findings identified HuR's regulation of CDC6 as an essential mechanism driving colorectal cancer tumorigenesis and L-OHP resistance, and this mechanism may represent a potential target for overcoming drug resistance in colorectal cancer.

journal_name

Mol Cancer Ther

authors

Cai J,Wang H,Jiao X,Huang R,Qin Q,Zhang J,Chen H,Feng D,Tian X,Wang H

doi

10.1158/1535-7163.MCT-18-0945

subject

Has Abstract

pub_date

2019-07-01 00:00:00

pages

1243-1254

issue

7

eissn

1535-7163

issn

1538-8514

pii

1535-7163.MCT-18-0945

journal_volume

18

pub_type

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