Relationship between promoter methylation of the
Runx3 and
Rassf1a genes and
Dnmt1 expression in gastric cancer.
Shijie Huaren Xiaohua Zazhi 2012;
20:3457-3463. [DOI:
10.11569/wcjd.v20.i35.3457]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To analyze the promoter methylation of the human runt-related transcription factor 3 (Runx3) and ras-association domain family 1a (Rassf1a) genes and Dnmt1 protein expression in gastric cancer and to analyze their relationship with gastric carcinogenesis.
METHODS: Methylation status of the Runx3 and Rassf1a genes in 68 gastric carcinoma tissues and 68 paired surgical marginal normal gastric tissues was detected using methylation-specific PCR. Real-time RT-PCR was used to detect the expression of Runx3, Rassf1a, and Dnmt1 mRNAs, and immunohistochemistry was used to detect the expression of RUNX3, RASSF1a, and DNMT1 proteins in the above samples.
RESULTS: The positive rates of promoter methylation of the Runx3 and Rassf1a genes were significantly higher in gastric cancer than in normal tissue (45.59% vs 10.29%; 64.70% vs 7.35%; both P < 0.0001). The positive rates of Runx3 and Rassf1a mRNA expression in gastric cancer were significantly lower than those in normal tissue (36.76% vs 100%; 27.94% vs 97.06%; both P < 0.0001), while that of Dnmt1 mRNA expression was higher compared to normal tissue (80.88% vs 17.65%, P < 0.0001). The expression patterns of RUNX3, RASSF1a, and DNMT1 proteins were consistent with those of Runx3, Rassf1a, and Dnmt1 mRNAs. The negative rates of Runx3 and Rassf1a mRNA expression in gastric cancer were significantly higher in the methylation group than in the non-methylation group (72.09% vs 0%; 85.71% vs 2.94%; both P < 0.0001). There was a negative correlation between the expression of RUNX3 and RASSF1a proteins and that of DNMT1 protein in gastric cancer tissue (r = -0.627, P < 0.0001; r = - 0.477, P < 0.0001).
CONCLUSION: The promoter methylation of the Runx3 and Rassf1a genes and high expression of Dnmt1 may be associated with the occurrence of gastric cancer.
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