Cell Growth & Differentiation, Vol 2, Issue 3 145-154, Copyright © 1991 by American Association of Cancer Research

ARTICLES

Epidermal growth factor receptor, platelet-derived growth factor receptor, and c-erbB-2 receptor activation all promote growth but have distinctive effects upon mouse mammary epithelial cell differentiation

D Taverna, B Groner and NE Hynes
Friedrich Miescher Institute, Basel, Switzerland.

Three different receptor tyrosine kinases, epidermal growth factor (EGF), c-erbB-2/neu, and platelet-derived growth factor (PDGF) receptors, have been found to be present in the mouse mammary epithelial cell line HC11. We have investigated the consequences of receptor activation on the growth and differentiation of HC11 cells. HC11 cells are normal epithelial cells which maintain differentiation-specific functions. Treatment of the cells with the lactogenic hormones glucocorticoids and prolactin leads to the expression of the milk protein beta-casein. Activation of EGF receptor has a positive effect on cell growth and causes the cells to become competent for the lactogenic hormone response. HC11 cells respond optimally to the lactogenic hormone mixture and synthesize high levels of beta-casein only if they have been kept previously in a medium containing EGF. Transfection of HC11 cells with the activated rat neuT receptor results in the acquisition of competence to respond to the lactogenic hormones even if the cells are grown in the absence of EGF. The activation of PDGF receptor, through PDGF-BB, also stimulates the growth of HC11 cells. Cells kept only in PDGF do not become competent for lactogenic hormone induction. The results show that activation of the structurally related EGF and c-erbB-2/neu receptors, but not the PDGF receptor, allows the HC11 cells to subsequently respond optimally to lactogenic hormones.

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