Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/52525
Type: Artigo de periódico
Title: 17-beta-estradiol affects nuclear image properties in MCF-10F human breast epithelial cells with tumorigenesis
Author: Mello, MLS
Russo, P
Russo, J
Vidal, BC
Abstract: Treatment of the human breast epithelial cells MCF-10F with 17-beta-estradiol (E2) induces transformation and tumorigenesis. E2-transformed MCF-10F cells are known to exhibit progressive loss of ductulogenesis, and invasive and tumorigenic phenotypes. Although DNA amounts and chromatin supraorganization change in E2-transformed MCF cells, no comparative study has yet been undertaken in the resulting cells selected for aggressive invasiveness (C5) and tumor generation in a heterologous host. The aim of this study was thus to determine whether changes in Feulgen-DNA content and chromatin supraorganization are involved during E2-induced transformation and tumorigenesis of the MCF-10F cells. Image analysis was performed for nontransformed and E2-transformed MCF cells, highly invasive cells (C5), and for cell lines (C5-A6-T6 and C5-A8-T8) derived from tumors generated by injection of C5 cells in SCID mice. A decrease in Feulgen-DNA amounts and nuclear sizes induced by E2 treatment was accented with selection of the highly invasive tumorigenesis potential. However, in the tumor-derived cells a high variability in cellular phenotypes resulted inclusively in near-polyploidy. Significant changes in textural parameters, including nuclear entropy, indicated chromatin structural remodeling with advancing tumorigenesis. An increased variability in the degree of chromatin packing states in the E2-transformed MCF cells is followed by reduction in chromatin condensation and in contrast between condensed and noncondensed chromatin in the highly invasive C5 cells and tumor-derived cell lines. Studies on epigenetic mechanisms involving DNA methylation and/or the histone code would contribute to a better interpretation of the chromatin supraorganization changes reported herein.
Subject: human breast epithelial cells
17-beta-estradiol
tumor-derived cells
chromatin packing states
image analysis
Country: Grécia
Editor: Professor D A Spandidos
Rights: embargo
Date Issue: 2007
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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