MicroRNA-34b functions as a potential tumor suppressor in endometrial serous adenocarcinoma.

Abstract:

:Endometrial serous adenocarcinoma (ESC) is aggressive and carries a poor prognosis. p53 is frequently mutated in ESC. microRNAs (miRNAs) are a direct p53 target and have been implicated in cancer cell behavior. In this study, we compared miRNA expression levels in ESC with the levels in endometrial endometrioid adenocarcinoma (EEC) and normal endometria. Six miRNAs were identified as having aberrant down-regulation specific to ESC with miR-34b being most pronounced. miR-34b was found to have promoter hypermethylation, which when reversed, restored miR-34b expression in the cell lines treated with 5-aza-2' deoxycytidine (DAC). Ectopic expression of miR-34b in turn inhibited cell growth, migration and most notably invasion. Our findings suggest a relationship among p53 mutation, miR-34b promoter methylation and tumor cell behavior. These effects are likely mediated by the downstream target of miR-34b, the proto-oncogene mesenchymal-epithelial transition factor (MET), a known prognostic factor in endometrial carcinomas. The expression of MET was reduced following the restoration of miR-34b in cell lines. In summary, our data suggest that miR-34b plays a role in the molecular pathogenesis of endometrial cancer.

journal_name

Int J Cancer

authors

Hiroki E,Suzuki F,Akahira J,Nagase S,Ito K,Sugawara J,Miki Y,Suzuki T,Sasano H,Yaegashi N

doi

10.1002/ijc.27345

subject

Has Abstract

pub_date

2012-08-15 00:00:00

pages

E395-404

issue

4

eissn

0020-7136

issn

1097-0215

journal_volume

131

pub_type

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