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BMC Cancer
Published in: BMC Cancer 1/2010

Open Access 01-12-2010 | Research article

TFPI-2 is a putative tumor suppressor gene frequently inactivated by promoter hypermethylation in nasopharyngeal carcinoma

Authors: Shumin Wang, Xue Xiao, Xiaoying Zhou, Tingting Huang, Chunping Du, Nana Yu, Yingxi Mo, Longde Lin, Jinyan Zhang, Ning Ma, Mariko Murata, Guangwu Huang, Zhe Zhang

Published in: BMC Cancer | Issue 1/2010

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Abstract

Background

Epigenetic silencing of tumor suppressor genes play important roles in NPC tumorgenesis. Tissue factor pathway inhibitor-2 (TFPI-2), is a protease inhibitor. Recently, TFPI-2 was suggested to be a tumor suppressor gene involved in tumorigenesis and metastasis in some cancers. In this study, we investigated whether TFPI-2 was inactivated epigenetically in nasopharyngeal carcinoma (NPC).

Methods

Transcriptional expression levels of TFPI-2 was evaluated by RT-PCR. Methylation status were investigated by methylation specific PCR and bisulfate genomic sequencing. The role of TFPI-2 as a tumor suppressor gene in NPC was addressed by re-introducing TFPI-2 expression into the NPC cell line CNE2.

Results

TFPI-2 mRNA transcription was inactivated in NPC cell lines. TFPI-2 was aberrantly methylated in 66.7% (4/6) NPC cell lines and 88.6% (62/70) of NPC primary tumors, but not in normal nasopharyngeal epithelia. TFPI-2 expression could be restored in NPC cells after demethylation treatment. Ectopic expression of TFPI-2 in NPC cells induced apoptosis and inhibited cell proliferation, colony formation and cell migration.

Conclusions

Epigenetic inactivation of TFPI-2 by promoter hypermethylation is a frequent and tumor specific event in NPC. TFPI-2 might be considering as a putative tumor suppressor gene in NPC.
Appendix
Available only for authorised users
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Metadata
Title
TFPI-2 is a putative tumor suppressor gene frequently inactivated by promoter hypermethylation in nasopharyngeal carcinoma
Authors
Shumin Wang
Xue Xiao
Xiaoying Zhou
Tingting Huang
Chunping Du
Nana Yu
Yingxi Mo
Longde Lin
Jinyan Zhang
Ning Ma
Mariko Murata
Guangwu Huang
Zhe Zhang
Publication date
01-12-2010
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2010
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/1471-2407-10-617

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