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• W2005609282 abstract "Gelsolin is a multifunctional, actin-binding protein that is greatly decreased in many transformed cell lines and tumor tissues, including breast cancers. Downregulation of gelsolin RNA occurs in most breast cancers of rats, mice, and humans, but gross mutations of the gelsolin gene have not been found. Here we demonstrate by PCR and RT-PCR analysis that there are no point mutations in putative regulatory regions or the entire coding region of the cytoplasmic isoform of the gelsolin gene in human breast cancer cells (BCC). To determine if epigenetic modification is involved in downregulating gelsolin expression in MDA-MB-231 (MDA231), MCF7, and T47D BCC, we have used Southern blot analysis, 5-azacytidine (5aza) treatment, and trichostatin A (TSA) treatment. Southern blot analysis performed on genomic DNA demonstrated altered CpG methylation within intron 1 in DNA from all BCC compared to normal, mortal human mammary epithelial cells (HMEC). Treatment of the BCC with 5aza converted the DNA restriction pattern to that seen in untreated HMEC genomic DNA and caused modest increases in gelsolin RNA and protein. Incubation with TSA, an inhibitor of histone deacetylase, induced a dramatic upregulation of gelsolin RNA and protein levels which preceded apoptotic death of all BCC within 48-60 h. Our data support a role for epigenetic changes in chromatin structure leading to downregulation of gelsolin expression in human breast cancer. To our knowledge, this is the first example of a tumor suppressor gene downregulated in human breast cancer by changes in histone acetylation." @default.
• W2005609282 created "2016-06-24" @default.
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• W2005609282 date "1999-05-01" @default.
• W2005609282 modified "2023-10-01" @default.
• W2005609282 title "Epigenetic Regulation of Gelsolin Expression in Human Breast Cancer Cells" @default.
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• W2005609282 doi "https://doi.org/10.1006/excr.1999.4461" @default.
• W2005609282 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/10328963" @default.
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