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Published in: Archives of Gynecology and Obstetrics 5/2014

01-05-2014 | Gynecologic Oncology

Epigenetic and expression analysis of TRAIL-R2 and BCL2: on the TRAIL to knowledge of apoptosis in ovarian tumors

Authors: Letícia da Conceição Braga, Luciana Maria Silva, Josiane Barbosa Piedade, Paulo Traiman, Agnaldo Lopes da Silva Filho

Published in: Archives of Gynecology and Obstetrics | Issue 5/2014

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Abstract

Objective

This study assesses TRAIL-R2 (TNF-related apoptosis-inducing ligand receptor 2) and BCL2 (B cell CLL/lymphoma 2) expression as well as CpG island methylation within the TRAIL-R2 promoter in ovarian serous tumors and primary and metastatic serous EOC (epithelial ovarian cancer).

Methods

RNA and DNA were obtained from women with normal ovarian tissues (n = 18), ovarian serous cystadenoma tumors (n = 11) and serous EOC (n = 16) using Trizol®. Quantitative PCR was performed to quantify the relative levels of TRAIL-R2 and BCL2. The methylation frequency of the TRAIL-R3 promoter was assessed using a methylation-specific PCR assay after DNA bisulfite conversion. Differences between the groups were evaluated using the χ 2, Mann–Whitney U or Kruskal–Wallis tests, as indicated.

Results

We identified TRAIL-R2 and BCL2 mRNA expressed in all ovarian tumor groups, and there were significant differences between the groups. Both genes had low expression levels in ovarian serous cystadenoma and primary EOC tumors when compared with metastatic EOC. Methylation of the TRAIL-R2 promoter was frequently observed in all groups; however, there were no statistically significant associations.

Conclusions

Primary EOC is associated with lower TRAIL-R2 and BCL2 expression levels, while metastatic EOC is associated with higher expression of these genes. Promoter DNA methylation was not related to this finding, suggesting there are other mechanisms involved in transcriptional control.
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Metadata
Title
Epigenetic and expression analysis of TRAIL-R2 and BCL2: on the TRAIL to knowledge of apoptosis in ovarian tumors
Authors
Letícia da Conceição Braga
Luciana Maria Silva
Josiane Barbosa Piedade
Paulo Traiman
Agnaldo Lopes da Silva Filho
Publication date
01-05-2014
Publisher
Springer Berlin Heidelberg
Published in
Archives of Gynecology and Obstetrics / Issue 5/2014
Print ISSN: 0932-0067
Electronic ISSN: 1432-0711
DOI
https://doi.org/10.1007/s00404-013-3060-0

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