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- Title
The N-methyl-D-aspartate receptor type 2A is frequently methylated in human colorectal carcinoma and suppresses cell growth.
- Authors
Kim, M S; Chang, X; Nagpal, J K; Yamashita, K; Baek, J H; Dasgupta, S; Wu, G; Osada, M; Woo, J-H; Westra, W H; Trink, B; Ratovitski, E A; Moon, C; Sidransky, D
- Abstract
N-methyl-D-aspartate receptors (NMDARs) are the predominant excitatory neurotransmitter receptors in the mammalian brain. We found that among the three NMDARs examined (NMDAR1, NMDAR2A, NMDAR2B), only NMDAR2A was silenced in colorectal carcinoma (CRC) cell lines at basal line and reactivated by the demethylating agent, 5-aza-2′-deoxycytidine. NMDAR2A was expressed in normal colon epithelium, while expression was hardly detectable in colon cancer tissues. Promoter methylation of NMDAR2A was confirmed by bisulfite sequencing and combined bisulfite restriction analysis in the CRC cell lines and primary tumors. Quantitative methylation-specific PCR demonstrated NMDAR2A promoter hypermethylation in 82 of 100 primary human CRC, 15 of 100 normal corresponding epithelial tissues and 1 of 11 (9%) normal colon mucosa samples obtained from patients without cancer. Moreover, forced expression of full-length NMDAR2A in CRC cell lines induced apoptosis and almost abolished the ability of the cells to form colonies in culture, while NMDAR2A knockdown increased cell growth. Thus, NMDAR2A is commonly hypermethylated in primary human CRC and possesses tumor-suppressive activity.Oncogene (2008) 27, 2045–2054; doi:10.1038/sj.onc.1210842; published online 8 October 2007
- Subjects
COLON cancer; METHYL aspartate; CELL death; CELL growth; CANCER; CELL lines
- Publication
Oncogene, 2008, Vol 27, Issue 14, p2045
- ISSN
0950-9232
- Publication type
Article
- DOI
10.1038/sj.onc.1210842