Novel evidence for an oncogenic role of microRNA-21 in colitis-associated colorectal cancer.

Abstract:

OBJECTIVE:miR-21 was found to be overexpressed in the colon tissues and serum of patients with UC and colorectal cancer (CRC); however, the exact roles of miR-21 in colitis-associated CRC remain unclear. The aim of our study was to investigate the biological mechanisms of miR-21 in colitis-associated colon cancer (CAC). DESIGN:miR-21 expression was examined in the tumours of 62 patients with CRC from China and 37 colitis-associated neoplastic tissues from Japan and Austria. The biological functions of miR-21 were studied using a series of in vitro, in vivo and clinical approaches. RESULTS:miR-21 levels were markedly upregulated in the tumours of 62 patients with CRC, 22 patients with CAC, and in a mouse model of CAC. Following azoxymethane and dextran sulfate sodium intervention, miR-21-knockout mice showed reduced expression of proinflammatory and procarcinogenic cytokines (interleukin (IL) 6, IL-23, IL-17A and IL-21) and a decrease in the size and number of tumours compared with the control mouse group. The absence of miR-21 resulted in the reduced expression of Ki67 and the attenuated proliferation of tumour cells with a simultaneous increase in E-cadherin and decrease in β-catenin and SOX9 in the tumours of CAC mice. Furthermore, the absence of miR-21 increased the expression of its target gene PDCD4 and subsequently modulated nuclear factor (NF)-κB activation. Meanwhile, miR-21 loss reduced STAT3 and Bcl-2 activation, causing an increase in the apoptosis of tumour cells in CAC mice. CONCLUSIONS:These observations provide novel evidence for miR-21 blockade to be a key strategy in reducing CAC.

journal_name

Gut

journal_title

Gut

authors

Shi C,Yang Y,Xia Y,Okugawa Y,Yang J,Liang Y,Chen H,Zhang P,Wang F,Han H,Wu W,Gao R,Gasche C,Qin H,Ma Y,Goel A

doi

10.1136/gutjnl-2014-308455

subject

Has Abstract

pub_date

2016-09-01 00:00:00

pages

1470-81

issue

9

eissn

0017-5749

issn

1468-3288

pii

gutjnl-2014-308455

journal_volume

65

pub_type

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