Mello MLS, Vidal BC, Russo IH, Lareef MH, Russo J. DNA content and chromatin texture of human breast epithelial cells transformed with 17-beta-estradiol and the estrogen antagonist ICI 182,780 as assessed by image analysis.
Mutat Res 2007;
617:1-7. [PMID:
17270221 PMCID:
PMC2614559 DOI:
10.1016/j.mrfmmm.2006.08.013]
[Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2005] [Revised: 07/24/2006] [Accepted: 08/24/2006] [Indexed: 10/23/2022]
Abstract
The immortalized human breast epithelial MCF-10F cell line, although estrogen receptor alpha negative, develops cell proliferating activities and invasiveness indicative of neoplastic transformation, after treatment with 17-beta-estradiol (E-2). These effects are similar to those produced by benzo[a]pyrene (BP). Since we have previously reported changes in the nuclear parameters accompanying BP-induced tumorigenesis in MCF-10F cells, we have examined whether similar alterations occur in E-2-treated cells. We therefore studied DNA amounts and other nuclear parameters in Feulgen-stained MCF-10F cells after treatment with various concentrations of E-2, BP, the estrogen antagonist ICI 182,780, and E-2 in the presence of ICI 182,780. E-2 caused a certain loss of DNA and changes in the nuclear size and chromatin supraorganization of MCF-10F cells. Many of these changes were similar to those produced by BP and were indicative of neoplastic transformation. More intense chromatin remodelling was seen with 70 nM E-2. Since these changes were not abrogated totally or partially by ICI 182,780, the neoplastic transformation of MCF-10F cells stimulated by E-2 involved a process that was independent of estrogen alpha-receptors. The changes produced by ICI 182,780 alone were attributed to effects other than its well-known anti-estrogenic activity.
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