GRHL2-miR-200-ZEB1 Maintains the Epithelial Status of Ovarian Cancer Through Transcriptional Regulation and Histone Modification

Overview

Journal Sci Rep

Specialty Science

Date 2016 Feb 19

PMID 26887977

Citations 86

Authors

Vin Yee Chung

Tuan Zea Tan

Ming Tan

Meng Kang Wong

Kuee Theng Kuay

Zhe Yang

Jieru Ye

Julius Muller

Cheryl M Koh

Ernesto Guccione

Jean Paul Thiery

Ruby Yun-Ju Huang

Affiliations

Soon will be listed here.

Abstract

Epithelial-mesenchymal transition (EMT), a biological process by which polarized epithelial cells convert into a mesenchymal phenotype, has been implicated to contribute to the molecular heterogeneity of epithelial ovarian cancer (EOC). Here we report that a transcription factor--Grainyhead-like 2 (GRHL2) maintains the epithelial phenotype. EOC tumours with lower GRHL2 levels are associated with the Mes/Mesenchymal molecular subtype and a poorer overall survival. shRNA-mediated knockdown of GRHL2 in EOC cells with an epithelial phenotype results in EMT changes, with increased cell migration, invasion and motility. By ChIP-sequencing and gene expression microarray, microRNA-200b/a is identified as the direct transcriptional target of GRHL2 and regulates the epithelial status of EOC through ZEB1 and E-cadherin. Our study demonstrates that loss of GRHL2 increases the levels of histone mark H3K27me3 on promoters and GRHL2-binding sites at miR-200b/a and E-cadherin genes. These findings support GRHL2 as a pivotal gatekeeper of EMT in EOC via miR-200-ZEB1.

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