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KGF-induced motility of breast cancer cells is dependent on Grb2 and Erk1,2

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Abstract

Breast cancer metastasis is directly associated with breast cancer cell motility. Using a cell culture wounding model, we have demonstrated that keratinocyte growth factor (KGF) enhanced the motility of estrogen receptor-positive breast cancer cells. However, the mechanisms by which KGF enhanced motility of breast cancer cells are not known. In the present study, we report that KGF-induced motility requires intact tyrosine kinase signaling since genistein, a tyrosine kinase inhibitor, led to decreased motility of breast cancer cells mediated by KGF. Using cDNA microarrays, we previously found that KGF increased the expression ofGrb2mRNA by 2-- the involvement of Grb2 in KGF-induced motility. Down-regulation of Grb2 protein expression inhibited KGF-induced motility. Since Grb2 is known to regulate Erk1,2 and Akt kinase activities we determined whether these downstream proteins may be vital to KGF-induced motility. Inhibiting the activation of Erk1,2 by PD98059 suppressed KGF-induced motility whereas inhibiting the activation of Akt by wortmannin did not affect KGF-induced motility. In conclusion, these results indicate that KGF mediated signal transduction employs Grb2 to transduce the tyrosine kinase signals resulting in the activation of Erk1,2 and breast cancer cell motility.

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Correspondence to J. Thomas Pento.

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Zang, Xp., Siwak, D.R., Nguyen, T.X. et al. KGF-induced motility of breast cancer cells is dependent on Grb2 and Erk1,2. Clin Exp Metastasis 21, 437–443 (2004). https://doi.org/10.1007/s10585-004-2051-8

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  • DOI: https://doi.org/10.1007/s10585-004-2051-8

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