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|Type:||Artigo de periódico|
|Title:||Ha-ras Oncogene Effect On Dna Content And Chromatin Supraorganization In Benzo[a]pyrene-transformed Human Breast Epithelial Cells|
De Vidal B.C.
|Abstract:||When transfected to benzo[a]pyrene (BP)-transformed MCF-10F human breast epithelial cells (BP1 cell line) the c-Ha-ras oncogene has proven to enhance the neoplastic changes initiated by exposure to BP, giving rise to an aggressive tumorigenic cell line, BP1-Tras. We have previously demonstrated by image analysis that BP affects the DNA content and the chromatin supraorganization of MCF-10F cells. Here Feulgen-stained BP1-Tras cells were studied by image analysis in order to evaluate possible additional changes in DNA content and chromatin texture induced by insertion of the ras oncogene. A high variability in DNA content also including polyploidy or near-polyploidy, and an increase in the packing states of the chromatin which became still condensed in BP1 cells were found in BP1-Tras cells. The results differed from those reported for the BP1-El cell line which is also an aggressive tumorigenic cell line, but was attained through progressive passages of BP- transformed cells. It was demonstrated that different patterns of changes in DNA content and chromatin organization may be involved in equally aggressive tumorigenic BP-transformed cell lines originated from the same cell line by different mechanisms.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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