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- W2021559630 abstract "We previously demonstrated that antiestrogen 4-hydroxytamoxifen (OH-Tam) blocks the mitogenic activity of growth factors in breast cancer. We now investigate this mechanism by evaluating how OH-Tam affects growth factor binding and receptor tyrosine kinase activity. We show here that OH-Tam has an opposite effect on epidermal growth factor (EGF) and insulin-like growth factor-1 (IGF-1) binding in estrogen receptor (ER) positive cells. A decrease in IGF-1 binding sites may explain the reduced IGF-I mitogenic effect, whereas an increase in high affinity EGF binding associated with a decrease in in vitro receptor autophosphorylation rather favors the possibility of an alteration in EGF receptor tyrosine kinase activity. We conclude that OH-Tam may prevent growth factor action in ER+ cells both by modulating the concentration of growth factor binding sites and by altering growth factor receptor functionality." @default.
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- W2021559630 date "1990-12-01" @default.
- W2021559630 modified "2023-09-25" @default.
- W2021559630 title "Mechanisms of 4-hydroxytamoxifen anti-growth factor activity in breast cancer cells: Alterations of growth factor receptor binding sites and tyrosine kinase activity" @default.
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- W2021559630 doi "https://doi.org/10.1016/s0006-291x(05)80873-3" @default.
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