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• W2144481424 abstract "Amplification and overexpression of the erbB-2 (HER-2/neu) proto-oncogene and exposure to the cell cycle mitogenic hormone estrogen (E2) have been associated with mammary tumorigenesis. Phytoestrogens found in soy act as selective estrogen receptor modulators and may also modify mammary carcinogenesis. We have used the wt-erbB-2 transgenic mouse model to study the effects of estrogen and dietary phytoestrogens on erbB-2-associated mammary tumorigenesis. Transgenic mice were treated with short-term E2 or placebo pellets during the early reproductive period and fed a casein or soy diet for life. Mammary tumors from the different treatment groups were used for the derivation of novel cell lines. Comparative genomic hybridization (CGH), flow cytometry, assays of cell proliferation and soft agar cloning were performed to study genomic instability and in vitro characteristics. CGH data were compared with corresponding parental tumors. Mammary tumors exhibited significantly fewer genetic changes than cell lines by CGH. Cell lines from soy-fed animals (that developed tumors with a longer latency) demonstrated the greatest frequency of chromosomal gain and loss. The E2-treated, casein-fed animals (that developed tumors with the shortest latency) had the fewest genetic changes in derived lines by CGH. Nonetheless, E2-associated tumors in vivo and lines in vitro had the most aggressive phenotypes. In addition, over 40% of all derived cell lines, and both tumors from the placebo-treated casein-fed mice, exhibited loss of chromosome 4 by CGH. In aggregate, our data suggest that estrogenic signaling influences mammary tumor development in this transgenic mouse model bearing the rat wt-erbB-2 gene. Once induced, tumors and derived lines demonstrate persistent phenotypic characteristics, including tumor aggression and shortened latency in E2-treated mice. Loss of chromosome 4 was commonly identified in derived lines and may have facilitated immortalization or passage in culture." @default.
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• W2144481424 date "2003-04-01" @default.
• W2144481424 modified "2023-10-16" @default.
• W2144481424 title "Characterization and chromosomal instability of novel derived cell lines from a wt-erbB-2 transgenic mouse model" @default.
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• W2144481424 doi "https://doi.org/10.1093/carcin/bgg001" @default.
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