Molecular Endocrinology, Vol 9, 14-23, Copyright © 1995 by Endocrine Society

ARTICLES

Neu differentiation factor/heregulin modulates growth and differentiation of HC11 mammary epithelial cells

BM Marte, M Jeschke, D Graus-Porta, D Taverna, P Hofer, B Groner, Y Yarden and NE Hynes
Friedrich Miescher Institute, Basel, Switzerland.

The HC11 mouse mammary epithelial cell line has proven to be a valuable in vitro model to study the roles of peptide factors and hormones involved in the growth and differentiation of mammary cells. Treatment of HC11 cells with the lactogenic hormones, dexamethasone, insulin, and PRL (DIP), leads to cellular differentiation and production of the milk protein beta-casein. We have analyzed the effects of Neu differentiation factor (NDF)/heregulin, a newly described activating ligand for erbB-2 and other members of the epidermal growth factor (EGF) receptor family, on cell growth and the expression of milk proteins in HC11 cells. In these cells, NDF induces tyrosine phosphorylation of erbB-2 and erbB-3. Both NDF and EGF stimulate HC11 cell proliferation and promote the responsiveness of HC11 cells to lactogenic hormones. NDF induces the expression of a 22-kilodalton milk protein. This protein is up-regulated by other factors, including dexamethasone, EGF, and basic fibroblast growth factor, and is controlled in a manner distinct from that of beta-casein. Like EGF, NDF inhibits the DIP-induced expression of beta-casein at the level of transcription. The inhibition is due to the negative effect of NDF on the activation of mammary gland factor (MGF/Stat5), a member of the Stat family of transcription factors, which is essential for beta- casein gene expression.

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