Overexpression of insulin-like growth factor binding protein 4 (IGFBP-4) in MCF-7 breast cancer cells is associated with reduced responsiveness to insulin-like growth factors in vitro and reduced tumour growth in vivo

  • Authors:
    • H Huynh
    • W Beamer
    • M Pollak
  • View Affiliations

  • Published online on: July 1, 1997     https://doi.org/10.3892/ijo.11.1.193
  • Pages: 193-197
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Abstract

Insulin-like growth factors (IGF-I and IGF-II) are potent mitogens for breast cancer cells. IGF bioactivity is influenced by IGF binding proteins (IGFBPs). In vitro, most breast cancer cell lines express and secrete IGFBP-4. Sense and antisense complementary DMA of human IGFBP-4 were ligated into a mammalian expression vector and transfected into MCF-7 cells in order to investigate the role of IGFBP-4 on breast cancer cell proliferation in vitro and in vivo. IGFBP-4 concentrations were 4-8-fold higher in conditioned media (CM) of sense IGFBP-4 transfected cells compared to control cells, while IGFBP-4 concentrations in the CM of antisense IGFBP-4 transfected cells were lower than those present in the CM of control cells. Basal growth of sense IGFBP-4 transfected cells (S11) in media supplemented with 0.5% fetal bovine serum was significantly lower (P<0.01) than that of a vector-transfected control (C13) and antisense IGFBP-4 transfected cells (AS4). Loss of IGF but not EGF responsiveness in S11 cells was observed 48 h after exposure to these mitogens. Equal response to Des (1-3) IGF-I (an IGF-I analogue with reduced affinity for IGF binding proteins) was observed for C13, S11 and AS4 cells, suggesting that loss of responsiveness to IGFs by S11 cells is a consequence of IGFBP-4 expression. The in viva proliferation of S11 was significantly (P<0.01) less than that of control C13 and AS4 cells in both lit/lit (IGF-I deficient) or lit/+ (IGF-I replete) hosts. These data demonstrate that IGFBP-4 expression influences breast cancer behaviour.

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July 1997
Volume 11 Issue 1

Print ISSN: 1019-6439
Online ISSN:1791-2423

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Spandidos Publications style
Huynh H, Beamer W and Pollak M: Overexpression of insulin-like growth factor binding protein 4 (IGFBP-4) in MCF-7 breast cancer cells is associated with reduced responsiveness to insulin-like growth factors in vitro and reduced tumour growth in vivo. Int J Oncol 11: 193-197, 1997.
APA
Huynh, H., Beamer, W., & Pollak, M. (1997). Overexpression of insulin-like growth factor binding protein 4 (IGFBP-4) in MCF-7 breast cancer cells is associated with reduced responsiveness to insulin-like growth factors in vitro and reduced tumour growth in vivo. International Journal of Oncology, 11, 193-197. https://doi.org/10.3892/ijo.11.1.193
MLA
Huynh, H., Beamer, W., Pollak, M."Overexpression of insulin-like growth factor binding protein 4 (IGFBP-4) in MCF-7 breast cancer cells is associated with reduced responsiveness to insulin-like growth factors in vitro and reduced tumour growth in vivo". International Journal of Oncology 11.1 (1997): 193-197.
Chicago
Huynh, H., Beamer, W., Pollak, M."Overexpression of insulin-like growth factor binding protein 4 (IGFBP-4) in MCF-7 breast cancer cells is associated with reduced responsiveness to insulin-like growth factors in vitro and reduced tumour growth in vivo". International Journal of Oncology 11, no. 1 (1997): 193-197. https://doi.org/10.3892/ijo.11.1.193