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Cell Growth & Differentiation, Vol 3, Issue 7 401-411, Copyright © 1992 by American Association of Cancer Research


ARTICLES

A ligand for the erbB-2 oncogene product (gp30) induces differentiation of human breast cancer cells

SS Bacus, E Huberman, D Chin, K Kiguchi, S Simpson, M Lippman and R Lupu
Cell Analysis Systems, Inc., Elmhurst, Illinois 60126.

The human erbB-2 oncogene encodes a tyrosine kinase receptor. A ligand for the erbB-2 receptor (gp30), with an apparent molecular weight of 30,000, was reported to modulate the growth of cells overexpressing erbB-2. Whereas low concentrations of gp30 induced proliferation of these cells, higher concentrations inhibited their growth. To elucidate the cellular mechanisms underlying cell growth inhibition by gp30, we tested the effect of this ligand on cell growth and differentiation of the human breast cancer cells AU-565 and MDA-MB-453 (which overexpress erbB-2) and MCF-7 cells (which express low levels of this protooncogene). Ligand concentrations that inhibited growth in cells overexpressing erbB-2 induced apparent differentiation of cells with a more mature phenotype, i.e., with characteristics such as inhibited cell growth, altered cytoplasmic and nuclear morphology, and increased synthesis of milk components (casein and lipids). No significant effect of the ligand was observed in the human breast cancer cell line MCF-7. Concomitant with the induction of differentiation in AU-565 and MDA-MB-453 cells, the erbB-2 protein was translocated from membrane to the cytoplasm and perinuclear sites. These findings indicate that ligand-induced growth inhibition in cells overexpressing erbB-2 is associated with an apparent induction of differentiation.


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HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Cancer Research Clinical Cancer Research
Cancer Epidemiology Biomarkers & Prevention Molecular Cancer Therapeutics
Molecular Cancer Research Cell Growth & Differentiation
Copyright © 1992 by the American Association of Cancer Research.