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연세대학교 의과대학 Yonsei Medical Journal Yonsei Medical Journal 제55권 제6호
발행연도
2014.1
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1,656 - 1,663 (8page)

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Purpose: Both genetic and epigenetic alterations can lead to abnormal expressionof metastasis-regulating genes in tumor cells. Recent studies suggest that aberrantepigenetic alterations, followed by differential gene expression, leads to an aggressive cancer cell phenotype. We examined epigenetically regulated genes that are involved in ovarian cancer metastasis. Materials and Methods: We developedSK-OV-3 human ovarian carcinoma cell xenografts in mice. We comparedthe mRNA expression and DNA methylation profiles of metastatic tissues to those of the original SK-OV-3 cell line. Results: Metastatic implants showed increased mRNA expression of the carbonic anhydrase 9 (CA9) gene and hypomethylationat CpG sites in the CA9 promoter. Treatment of wild-type SK-OV-3 cells with the DNA methyltransferase inhibitor 5-aza-2’-deoxycytidine reduced methylation of the CA9 promoter and increased CA9 mRNA expression. Eight CpGs, which were located at positions -197, -74, -19, -6, +4, +13, +40, and +86, relative to the transcription start site, were hypomethylated in metastatic tumor implants, compared to that of wild-type SK-OV-3. Overexpression of CA9 inducedan aggressive phenotype, including increased invasiveness and migration, in SK-OV-3 cells. Conclusion: Alterations in the DNA methylation profile of the CA9 promoter were correlated with a more aggressive phenotype in ovarian cancercells.

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