[Expression of MAGE-A1 in human hepatoma cell lines associated with genic hypomethylation].
OBJECTIVE
To investigate the correlation between MAGE-A1 mRNA expression and genic demethylation in hepatoma cell lines.


METHODS
Total RNA and genomic DNA were prepared from 10 human hepatoma cell lines. MAGE-1 mRNA expression was determined with RT-PCR and the level of genome-wide demethylation was evaluated by enzyme digestion and Southern blot assay. The genomic DNA was digested by HpaII, then the promoter of MAGE-A1 gene was amplified with primers CDS21, EDP4 and CDS20. EDP4 and the PCR products were further hybridized with a probe to detect the methylation in the promoter of the MAGE-A1 gene. HLA-A locus was typed using SSP kit.


RESULTS
In cell lines QGY-7703, SMMC-7721, HLE, BEL-7402, BEL-7404 and BEL-7405, MAGE-A1 mRNA expression was positive and cell differentiation was moderate or low. In cell lines of HepG2 2.2.15, HepG2, QGY-7701 and Huh7, MAGE-A1 mRNA expression was negative and cell differentiation was well or moderate. The level of genomic demethylation in MAGE-A1 mRNA positive cell lines was much higher than that in MAGE-A1 mRNA negative cell lines (t = 2.896, P = 0.02). The methylation analysis showed that methylation in the promoters of MAGE-A1 gene of HepG2 2.2.15, HepG2, QGY-7701 and Huh7 was high, and that methylation in those of SMMC-7721, HLE, BEL-7402, BEL-7404, and BEL-7405 was low.


CONCLUSIONS
The results suggest that MAGE-A1 mRNA expression in the human hepatoma cell lines is associated with genic hypomethylation.
Xiao
Jiang
J
Hepatology Institute, Peking University People's Hospital, Beijing 100044, China.
Chen
Hong-song
HS
Fei
Ran
R
Cong
Xu
X
Wang
Yan
Y
Jiang
Dong
D
Wei
Lai
L
Wang
Yu
Y
D000951:Antigens, Neoplasm; D006528:Carcinoma, Hepatocellular / Q000235:genetics* / Q000276:immunology / Q000378:metabolism; D019175:DNA Methylation; D006801:Humans; D008113:Liver Neoplasms / Q000235:genetics* / Q000276:immunology / Q000378:metabolism; D058950:Melanoma-Specific Antigens; D009363:Neoplasm Proteins / Q000096:biosynthesis* / Q000235:genetics; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics; D014407:Tumor Cells, Cultured
D000951:Antigens, Neoplasm; D058950:Melanoma-Specific Antigens; D009363:Neoplasm Proteins; D012333:RNA, Messenger