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Published in: Molecular Cancer 1/2012

Open Access 01-12-2012 | Research

Promoter Methylation status of HIN-1 associated with outcomes of ovarian clear cell adenocarcinoma

Authors: Chih-Ming Ho, Chi-Jung Huang, Chia-Yen Huang, Yih-Yiing Wu, Shwu-Fen Chang, Wen-Fang Cheng

Published in: Molecular Cancer | Issue 1/2012

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Abstract

Background

This study is to analyze promoter methylation of various tumor suppressor genes in different types of ovarian carcinoma and to identify potential therapeutic targets of ovarian clear cell adenocarcinoma (OCCA).

Materials and methods

The promoter methylation statuses of 40 genes in primary ovarian carcinomas including 47 clear- and 63 non-clear-cell type tissues, 6 OCCA cell lines, 29 benign ovarian endometriotic cysts, and 31 normal controls were analyzed by methylation-specific multiplex ligation-dependent probe amplification (MS-MLPA). The MS-MLPA results were correlated with clinicopathological features and outcomes of 47 OCCA patients. Functions of the target genes were further explored by Western Blot Analysis, apoptosis assay, and caspase-3/7 activity analysis.

Results

Frequencies of methylated RASSF1A, CDH13, CACNA1A, HIN-1, and sFRP5 genes in OCCA tissues were significantly higher than those in non-OCCA cancerous tissues and benign endometriotic cysts. The expected OS for patients with methylated promoters of HIN-1 was significantly worse than those for patients without methylated HIN-1 (30% vs. 62%, p = 0.002). The HIN-1 gene was over-expressed in ES2 cells, a significant reduction in cell growth and induction of apoptosis, and increasing paclitaxel sensitivity by reducing phosphorylation of Akt were observed.

Conclusions

Methylation of HIN-1 promoter is a novel epigenetic biomarker associated with poor outcomes in OCCA patients. Ectopic expression of the HIN-1 gene increased paclitaxel sensitivity which is partly through Akt pathway.
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Metadata
Title
Promoter Methylation status of HIN-1 associated with outcomes of ovarian clear cell adenocarcinoma
Authors
Chih-Ming Ho
Chi-Jung Huang
Chia-Yen Huang
Yih-Yiing Wu
Shwu-Fen Chang
Wen-Fang Cheng
Publication date
01-12-2012
Publisher
BioMed Central
Published in
Molecular Cancer / Issue 1/2012
Electronic ISSN: 1476-4598
DOI
https://doi.org/10.1186/1476-4598-11-53

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