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- W3204109854 abstract "Growth Hormone (GH) plays crucial roles in mammary gland development and growth, and its upregulation has been associated with breast cancer promotion and/or progression. To ascertain how high GH levels could promote mammary tissue oncogenic transformation, morphological characteristics and the expression of receptors involved in mammary growth, development and cancer, and of mitogenic mediators were analyzed in the mammary gland of virgin adult transgenic mice that overexpress GH. Whole mounting and histologic analysis evidenced that transgenic mice exhibit increased epithelial ductal elongation and enlarged ducts along with deficient branching and reduced number of alveolar structures compared to wild type mice. The number of differentiated alveolar structures was diminished in transgenic mice while the amount of terminal end buds (TEBs) did not differ between both groups of mice. GH, insulin-like growth factor 1 (IGF1) and GH receptor mRNA levels were augmented in GH-overexpressing mice breast tissue, as well as IGF1 receptor protein content. However, GH receptor protein levels were decreased in transgenic mice. Fundamental receptors for breast growth and development like progesterone receptor and epidermal growth factor receptor were also increased in mammary tissue from transgenic animals. In turn, the levels of the proliferation marker Ki67, cFOS and Cyclin D1 were increased in GH-overexpressing mice, while cJUN expression was decreased and cMYC did not vary. In conclusion, prolonged exposure to high GH levels induces morphological and molecular alterations in the mammary gland that affects its normal development. While these effects would not be tumorigenic per se, they might predispose to oncogenic transformation." @default.
- W3204109854 created "2021-10-11" @default.
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- W3204109854 date "2021-12-01" @default.
- W3204109854 modified "2023-10-06" @default.
- W3204109854 title "Morphological and molecular effects of overexpressed GH on mice mammary gland" @default.
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- W3204109854 doi "https://doi.org/10.1016/j.mce.2021.111465" @default.
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