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Victorian Breast Cancer Research Consortium Invasion and Metastasis Unit [J. T. P., E. W. T.] and Cellular Signaling Laboratory [T. T.], St. Vincent’s Institute of Medical Research, Fitzroy, 3065, Australia, and Departments of Orthopaedic Surgery [A. A., E. W. T.], Cell Biology [D. D., E. W. T.], and The Vincent T. Lombardi Cancer Center [D. D., E. W. T.], Georgetown University Medical Center, Washington, D.C. 20007
Epidermal growth factor receptor (EGFR) levels predict a poor outcome in human breast cancer and are most commonly associated with proliferative effects of epidermal growth factor (EGF), with little emphasis placed on motogenic responses to EGF. We found that MDA-MB-231 human breast cancer cells elicited a potent chemotactic response despite their complete lack of a proliferative response to EGF. Antagonists of EGFR ligation, the EGFR kinase, phosphatidylinositol 3'-kinase, and phospholipase C, but not the mitogen-activated protein kinases (extracellular signal-regulated protein kinase 1 and 2), blocked MDA-MB-231 chemotaxis. These findings suggest that EGF may influence human breast cancer progression via migratory pathways, the signaling for which appears to be dissociated, at least in part, from the proliferative pathways.
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