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- W2013684570 abstract "Physiological concentration of genistein, a natural isoflavonoid phytoestrogen, stimulates human breast cancer (MCF-7) cells proliferation. In this study, we hypothesize that low concentration of genistein mimics the action of 17β-estradiol in stimulation of MCF-7 cell growth by enhancement of IGF-I signaling pathway. Genistein, at 1 μm, stimulated the growth of MCF-7 cells. Cell cycle analysis showed that 1 μm genistein significantly increased the S phase and decreased the G0G1 phase of MCF-7 cells. The protein and mRNA expression of IGF-I receptor (IGF-IR) and insulin receptor substrate (IRS)-1, but not Src homology/collagen protein, increased in response to 1 μm genistein in a time-dependent manner. These effects could be completely abolished by cotreatment of MCF-7 cells with estrogen antagonist ICI 182,780 (1 μm) and tamoxifen (0.1 μm). Our results also showed that genistein induction of IGF-IR and IRS-1 expression resulted in enhanced tyrosine phosphorylation of IGF-IR and IRS-1 on IGF-I stimulation. Taken together, these data provide the first evidence that the IGF-IR pathway is involved in the proliferative effect of low-dose genistein in MCF-7 cells." @default.
- W2013684570 created "2016-06-24" @default.
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- W2013684570 date "2004-05-01" @default.
- W2013684570 modified "2023-10-17" @default.
- W2013684570 title "Genistein Enhances Insulin-Like Growth Factor Signaling Pathway in Human Breast Cancer (MCF-7) Cells" @default.
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- W2013684570 doi "https://doi.org/10.1210/jc.2003-032065" @default.
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