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RESEARCH ARTICLE

Activation of tumour necrosis factor-related apoptosis-inducing ligand (TRAIL) receptor gene expression following DNA demethylation in placental choriocarcinoma and transformed cell lines

Pan-Hong Wu A , Xue-Mei Chen A , Xue-Qing Liu A , Jun-Lin He A , Qian Feng A , Xi Lan A , Xue Zhang A , Yan-Qing Geng A , Ying-Xiong Wang A and Yu-Bin Ding A B
+ Author Affiliations
- Author Affiliations

A Laboratory of Reproductive Biology, School of Public Health and Management, Chongqing Medical University, Box 197, No.1 Yixueyuan Road, Yuzhong District, 400016 Chongqing, PR China.

B Corresponding author. Email: dingyb@gmail.com

Reproduction, Fertility and Development 28(11) 1844-1853 https://doi.org/10.1071/RD14408
Submitted: 26 October 2014  Accepted: 29 April 2015   Published: 27 May 2015

Abstract

We characterised DNA methylation and gene expression of four tumour necrosis factor-related apoptosis-inducing ligand (TRAIL) receptors DR4, DR5, DcR1 and DcR2 in three choriocarcinoma (JAR, JEG-3, BeWo) and two transformed (HTR-8/SVneo and HPT-8) cell lines. DR4 mRNA was detected in JAR, JEG-3, BeWo and HTR-8/SVneo cells, whereas DR5 was present in all detected cells. DcR1 transcripts were expressed only in JAR, JEG-3 and BeWo cells, whereas DcR2 transcripts were detected only in HTR-8/SVneo and HPT-8 cells. Hypermethylated DR4 promoter was observed in JAR, JEG-3, BeWo and HTR-8/SVneo cells, hypermethylated DcR1 promoter in HTR-8/SVneo and HPT-8 cells and hypermethylated DcR2 promoter in JAR, JEG-3 and BeWo cells. Restoration of DR4, DcR1 and DcR2 expression with decreased DNA methylation of these genes was induced by the DNA demethylation agent 5-aza-2′-deoxycytidine (5-aza-CdR) in trophoblast cells, whereas DR5 expression did not exhibit any change. Significant negative correlation between the expression and DNA methylation of these genes was also observed. In all tested cell lines, only HPT-8 demonstrated sensitivity to TRAIL-induced apoptosis. Combined treatment with 5-aza-CdR and TRAIL resulted in apoptosis in JAR, JEG-3, BeWo and HTR-8/SVneo cells but not in HPT-8 cells. The results indicate that DNA methylation is associated with TRAIL receptor expression and might be involved in trophoblast apoptosis.

Additional keywords: apoptosis, DNA methylation, trophoblast.


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