Abstract:
:Tumor cells express lower levels of manganese superoxide dismutase (MnSOD) than their normal counterparts. Enforced expression of MnSOD reverses the malignant phenotype of many transformed cells, suggesting that SOD2 is a tumor suppressor. The SOD2 gene contains a large CpG island spanning > 3.5 kb that starts near the 5' edge of the promoter and extends into intron 2. We hypothesized that the difference in SOD2 expression between tumor cells and their normal cell counterparts might be secondary to differences in their cytosine methylation patterns in this CpG island. To test this hypothesis, we analyzed the methylation status of the SOD2 gene in two cell line models that show differential MnSOD expression between normal and SV40-transformed cells: WI38 and MRC5 and their SV40-transformed variants, WI38-VA and MRC5-VA. We subdivided the SOD2 gene CpG island into 10 individual regions for analysis by bisulfite genomic sequencing. A region located in intron 2 displayed a significant increase in cytosine methylation in both transformed cell lines that expressed low levels of MnSOD mRNA compared with their normal cell counterparts. Recent studies by others have shown that SOD2 intron 2 is a potent transcriptional enhancer. The association between increased cytosine methylation of the SOD2 intron 2 region and decreased MnSOD expression in transformed cells compared with their normal counterparts suggests that an epigenetic mechanism contributes to the differential SOD2 gene expression between these normal and SV40-transformed cells.
journal_name
DNA Cell Bioljournal_title
DNA and cell biologyauthors
Huang Y,He T,Domann FEdoi
10.1089/104454999315051keywords:
subject
Has Abstractpub_date
1999-08-01 00:00:00pages
643-52issue
8eissn
1044-5498issn
1557-7430journal_volume
18pub_type
杂志文章abstract::RUNX2 is a member of the RUNX family of transcription factors, also containing the RUNX1 and RUNX3 proteins. These factors control the expression of genes essential for proper development in many cell lineages. RUNX2 plays a crucial role in the proliferation and differentiation of osteoblasts, required for bone format...
journal_title:DNA and cell biology
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journal_title:DNA and cell biology
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journal_title:DNA and cell biology
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