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- W2033306044 abstract "Insulin-like growth factor-1 (IGF-1) and its receptor are believed to play an important role in mitogenesis and neoplastic transformation. The purpose of this study was to further examine the role of IGF-1 during tumor promotion in mouse skin. HK1.IGF1 transgenic mice, which overexpress IGF-1 in epidermis via the human keratin 1 promoter, were previously shown to be hypersensitive to skin tumor promotion by 12-O-tetradecanoylphorbol-13-acetate (TPA). We examined these mice for their sensitivity to diverse classes of tumor-promoting agents. HK1.IGF-1 transgenic mice initiated with 7,12-dimethylbenz[a]anthracene were more sensitive to treatment with a wide variety of tumor promoters, including chrysarobin, okadaic acid, and benzoyl peroxide, which resulted in more rapid development of tumors and a dramatic increase in the number of tumors per mouse compared with corresponding non-transgenic mice treated with the same compounds. Histological analyses of skin from HK1.IGF-1 mice treated with various tumor promoters revealed that these mice were also more sensitive to the induction of epidermal hyperplasia and cell proliferation. Analysis of the IGF-1 receptor (IGF-1r) and epidermal growth factor (EGFr) in the epidermis of TPA-treated HK1.IGF-1 transgenic and non-transgenic mice revealed that both receptors were activated (hyperphosphorylated on tyrosine residues), and the level of activation was higher in transgenic mice. The mechanism for the increased sensitivity of HK1.IGF-1 mice to tumor promoters may involve cooperation between the IGF-1r and EGFr signaling pathways. Our data suggest that IGF-1r signaling may play an important role in the process of tumor promotion by diverse classes of tumor promoters. Mol. Carcinog. 25:122–131, 1999. © 1999 Wiley-Liss, Inc." @default.
- W2033306044 created "2016-06-24" @default.
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- W2033306044 date "1999-06-01" @default.
- W2033306044 modified "2023-09-25" @default.
- W2033306044 title "Enhancement of susceptibility to diverse skin tumor promoters by activation of the insulin-like growth factor-1 receptor in the epidermis of transgenic mice" @default.
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- W2033306044 doi "https://doi.org/10.1002/(sici)1098-2744(199906)25:2<122::aid-mc7>3.0.co;2-8" @default.
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