DNA methylation of genes linked with retinoid signaling in gastric carcinoma: expression of the retinoid acid receptor beta, cellular retinol-binding protein 1, and tazarotene-induced gene 1 genes is associated with DNA methylation.

Abstract:

BACKGROUND:Hypermethylation of CpG islands has been associated with silencing of various tumor suppressor genes, and the retinoid acid receptor beta (RARbeta), cellular retinol-binding protein 1 (CRBP1), and tazarotene-induced gene 1 (TIG1) genes have been associated with retinoic acid signaling. To the authors' knowledge, little is known regarding the involvement of these three genes in gastric carcinoma (GC). In this study, the authors investigated the methylation status of these genes and analyzed the role of their DNA methylation in GC. METHODS:DNA methylation of 3 retinoic acid-associated genes was analyzed in 42 samples of GC from 42 patients and in 8 GC cell lines by methylation-specific polymerase chain reaction (PCR) analysis. The mRNA expression levels for these three genes were measured by quantitative reverse transcription-PCR. RESULTS:In 7 of 8 GC cell lines, the CRBP1 gene was hypermethylated, and CRBP1 transcription was inactive. In 6 of 8 GC cell lines, the TIG1 gene was hypermethylated, and TIG1 transcription was inactive. Treatment with demethylating agent 5-aza-2'-deoxycytidine restored both CRBP1 and TIG1 transcription. DNA methylation of the RARbeta, CRBP1, and TIG1 genes was detected in 15 of 42 GC samples (36%), 14 of 42 GC samples (33%), and 4 of 42 GC samples (10%), respectively, and in 6 of 30 samples (20%), 0 of 30 samples (0%), and 1 of 30 samples (3%) of corresponding nonneoplastic mucosa. None of the 10 normal gastric mucosa samples from young, healthy individuals demonstrated hypermethylation of any of these genes. DNA methylation of each gene was associated significantly with low mRNA expression of the respective gene. Twenty-four of 42 GC samples (57%) demonstrated hypermethylation of at least 1 of the 3 genes. However, no significant, concordant hypermethylation of these genes was observed. CONCLUSIONS:The results suggested that gastric carcinogenesis involves transcriptional inactivation by aberrant DNA methylation of genes related to retinoid signaling.

journal_name

Cancer

journal_title

Cancer

authors

Shutoh M,Oue N,Aung PP,Noguchi T,Kuraoka K,Nakayama H,Kawahara K,Yasui W

doi

10.1002/cncr.21392

subject

Has Abstract

pub_date

2005-10-15 00:00:00

pages

1609-19

issue

8

eissn

0008-543X

issn

1097-0142

journal_volume

104

pub_type

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