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Mitogenic Properties of Insulin-Like Growth Factors I and II, Insulin-like Growth Factor Binding Protein-3 and Epidermal Growth Factor on Human Breast Stromal Cells in Primary Culture

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Abstract

Insulin-like growth factors I and II (IGF-I and IGF-II) are growth factors implicated in both normal mammary gland development and breast cancer. We have previously reported on the effects of components of the IGF system on breast epithelial cells. Since data suggests that stromal–epithelial interactions play a crucial role in breast cancer, we have now investigated the mitogenic properties of IGF-I, IGF-II, insulin-like growth factor binding protein-3 (IGFBP-3) and epidermal growth factor (EGF) on human breast stromal cells in primary culture. We show that, under serum-free conditions, stromal cells are stimulated to grow in response to IGF-I and IGF-II in a dose-dependent manner. IGF-I and EGF, a potent stimulator of human breast epithelial cell growth in primary culture and also associated with breast cancer, appear to stimulate stromal cell growth in a synergistic manner. IGFBP-3 does not inhibit the stimulation of growth by IGF-I, or IGF-I plus EGF. However, IGFBP-3 does inhibit the stimulation of growth by IGF-II. In contrast to our previous results with human breast epithelial cells, IGFBP-3 does not have an IGF-independent inhibitory effect on stromal cell growth. This study is the first to address the effects of IGF-I, IGF-II and IGFBP-3 alone and in combination with EGF on human breast stromal cell growth in primary culture. Characterizing the role of the IGF system in both normal breast epithelial cells and stromal cells will aid in our understanding of the mechanisms behind the role of the IGF system in breast cancer.

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Authors and Affiliations

  1. Department of Anatomy, Faculty of Medicine, University of British Columbia, Vancouver, BC, Canada

    Karen S. Strange, Darcy Wilkinson, Glenn Edin & Joanne T. Emerman

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  1. Karen S. Strange
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  2. Darcy Wilkinson
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  3. Glenn Edin
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  4. Joanne T. Emerman
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Strange, K.S., Wilkinson, D., Edin, G. et al. Mitogenic Properties of Insulin-Like Growth Factors I and II, Insulin-like Growth Factor Binding Protein-3 and Epidermal Growth Factor on Human Breast Stromal Cells in Primary Culture. Breast Cancer Res Treat 84, 77–84 (2004). https://doi.org/10.1023/B:BREA.0000018384.64326.dd

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  • DOI: https://doi.org/10.1023/B:BREA.0000018384.64326.dd

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