Journal of Mammary Gland Biology and Neoplasia

, Volume 10, Issue 1, pp 17–24

Stem/Progenitor Cells in Mouse Mammary Gland Development and Breast Cancer


DOI: 10.1007/s10911-005-2537-2

Cite this article as:
Li, Y. & Rosen, J.M. J Mammary Gland Biol Neoplasia (2005) 10: 17. doi:10.1007/s10911-005-2537-2


Breast cancer is a genetically and clinically heterogeneous disease. It is unclear whether different target cells contribute to this heterogeneity and which cell types are most susceptible to oncogenesis. Stem cells are speculated to be the cellular origin of at least a subset of human breast cancers. To begin to address these issues, we have isolated and characterized cell populations enriched in normal mammary stem/progenitors and have studied the expression of putative stem/progenitor markers in tumors derived from genetically engineered mice. Specifically, transgenic activation of Wnt signaling in the mammary gland induces tumors comprised of epithelial and myoepithelial cells harboring the same genetic defect implying that the tumor arose from transformation of a bipotent progenitor cell. On the other hand, transgenic activation of Neu signaling induces tumors comprising cells of more limited lineage capacity. Thus, the heterogeneity of different breast cancers may reflect the activation of different oncogenic pathways, different cellular targets in which these genetic changes occur, or both.

mammary gland stem/progenitor cells breast cancer Wnt ErbB2/HER2/Neu 

Abbreviations used




stem cell antigen-1


mouse mammary tumor virus


label-retaining cell


breast cancer resistance protein-1


mammary epithelial cell


terminal end bud


polyoma middle T antigen


whey acidic protein

Copyright information

© Springer Science + Business Media, Inc. 2005

Authors and Affiliations

  1. 1.Department of Molecular and Cellular BiologyBaylor College of MedicineHouston
  2. 2.Breast CenterBaylor College of MedicineHouston
  3. 3.Department of Molecular and Cellular BiologyBaylor College of Medicine