Breast Cancer Research and Treatment

, Volume 67, Issue 2, pp 93–109 | Cite as

Characterization of bipotent mammary epithelial progenitor cells in normal adult human breast tissue

  • John Stingl
  • Connie J. Eaves
  • Iman Zandieh
  • Joanne T. Emerman


The purpose of the present study was to characterize primitive epithelial progenitor populations present in adult normal human mammary tissue using a combination of flow cytometry and in vitro colony assay procedures. Three types of human breast epithelial cell (HBEC) progenitors were identified: luminal-restricted, myoepithelial-restricted and bipotent progenitors. The first type expressed epithelial cell adhesion molecule (EpCAM), α6 integrin and MUC1 and generated colonies composed exclusively of cells positive for the luminal-associated markers keratin 8/18, keratin 19, EpCAM and MUC1. Bipotent progenitors produced colonies containing a central core of cells expressing luminal markers surrounded by keratin 14+ myoepithelial-like cells. Single cell cultures confirmed the bipotentiality of these progenitors. Their high expression of α6 integrin and low expression of MUC1 suggests a basal position of these cells in the mammary epithelium in vivo. Serial passage in vitro of an enriched population of bipotent progenitors demonstrated that only myoepithelial-restricted progenitors could be readily generated under the culture conditions used. These results support a hierarchical branching model of HBEC progenitor differentiation from a primitive uncommitted cell to luminal- and myoepithelial-restricted progenitors.

cell culture flow cytometry human mammary epithelial cell stem cells 


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Copyright information

© Kluwer Academic Publishers 2001

Authors and Affiliations

  • John Stingl
    • 1
  • Connie J. Eaves
    • 2
  • Iman Zandieh
    • 1
  • Joanne T. Emerman
    • 1
  1. 1.Department of AnatomyUniversity of British ColumbiaCanada
  2. 2.Department of Medical GeneticsUniversity of British Columbia, Terry Fox Laboratory, British Columbia Cancer AgencyVancouverCanada

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