5-Aza-CdR regulates the expression of RASSF1A gene in human gastric cancer cell line and inhibits the growth of cells.
- Author:
Wen-Jing SHEN
1
;
Dong-Qiu DAI
;
Yue TENG
;
Hong-Bo LIU
Author Information
- Publication Type:Journal Article
- MeSH: Azacitidine; analogs & derivatives; pharmacology; Cell Line, Tumor; DNA Methylation; Gene Expression Regulation, Neoplastic; drug effects; Humans; Stomach Neoplasms; genetics; metabolism; Tumor Suppressor Proteins; metabolism
- From: Chinese Journal of Gastrointestinal Surgery 2009;12(1):57-60
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVETo investigate the effect of demethylating agent 5-Aza-CdR (5-aza-2'- deoxycytidine) on demethylation and transcription-regulating of RASSF1A gene in gastric cancer cell SGC7901 in vitro, as well as on the growth inhibition of cells.
METHODSAfter SGC7901 cells were treated with 5-Aza-CdR, MTT assay, flow cytometry, and Annexin V-FITC staining were performed to analyze the cell proliferation, cell cycle and apoptotic rate respectively. Methylation- specific PCP (MSP), RT-PCR and Western blotting were used to detect methylation state, expression of mRNA and protein of RASSF1A gene.
RESULTSAfter SGC7901 cells were treated with different concentrations of 5-Aza-CdR, the cell growth was inhibited(P<0.05), the cell cycle was blocked at G(1) phase, and the apoptotic rate increased significantly(P<0.05). Hypermethylation was detected in the promoter region of RASSF1A gene in SGC7901 cells, and no expression of RASSF1A mRNA and protein was found. After treated with 5-Aza-CdR, demethylation occurred in RASSF1A gene,which subsequently induced re-expression of this gene at both mRNA and protein level.
CONCLUSIONDemethylating agent 5-Aza-CdR can regulate demethylation and re-expression of RASSF1A gene in gastric cancer cell SGC7901,and inhibit its growth.