N-methyl-D-aspartate receptor type 2B is epigenetically inactivated and exhibits tumor-suppressive activity in human esophageal cancer

Myoung Sook Kim, Keishi Yamashita, Jin Hyen Baek, Hannah Lui Park, Andre Lopes Carvalho, Motonobu Osada, Mohammad Obaidul Hoque, Sunil Upadhyay, Masaki Mori, Chulso Moon, David Sidransky

研究成果: ジャーナルへの寄稿学術誌査読

91 被引用数 (Scopus)

抄録

Promoter hypermethylation accompanied by gene silencing is a common feature of human cancers. We identified previously several new tumor suppressor genes based on pharmacologic unmasking of the promoter region and detection of reexpression on microarray analysis. In this study, we modified the selection of candidates from our previous microarray data by excluding genes that showed basal expression in cancer cell lines. With the new method, we found novel methylated genes with 90% accuracy. Among these 33 novel methylated genes that we identified in esophageal squamous cell carcinoma (ESCC) cell lines, N-methyl-D-aspartate receptor type 2B (NMDAR2B) was of particular interest. NMDAR2B was methylated in 95% of primary human ESCC tissue specimens and 12 ESCC cell lines by sequence analysis. NMDAR2B expression was silenced in all 12 ESCC cell lines and was reactivated by the demethylating agent 5-aza-2′ -deoxycytidine. Moreover, reintroduction of the gene was accompanied by marked Ca2+-independent apoptosis in ESCC cell lines, suggesting that NMDAR2B can suppress tumor growth. Thus, NMDAR2B promoter methylation is common in ESCC, abrogating gene transcription and leading to cellular resistance to apoptosis.

本文言語英語
ページ(範囲)3409-3418
ページ数10
ジャーナルCancer Research
66
7
DOI
出版ステータス出版済み - 4月 1 2006
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 腫瘍学
  • 癌研究

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