Abstract
Human breast tissue is highly dynamic, undergoing extensive development and differentiation after birth during puberty, pregnancy, and lactation. The ability to sustain the tissue through, potentially, multiple rounds of pregnancies and lactations in a woman’s lifetime suggests the presence of tissue-resident stem/progenitor cells that maintain the two main lineages of the breast epithelium, luminal and basal/myoepithelial cells. Although human breast tissue is functionally similar to the murine mammary gland, structural and developmental differences suggest that the organization and regulation of the epithelial hierarchy in humans may be more complex. Taking cues from studies of mouse and rat mammary gland biology, much research effort has been expended into characterizing the human breast epithelial hierarchy. The use of epithelial cell surface markers coupled with assays to define progenitor activity in vitro and in vivo has greatly expanded our understanding. While the full picture of the human mammary hierarchy is still incomplete, it is instructive for the understanding of heterogeneity in breast cancers and how this may relate to patient treatments and outcomes.
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Abbreviations
- ALDH:
-
Aldehyde dehydrogenase
- α-SMA:
-
Alpha smooth muscle actin
- CALLA:
-
Common acute lymphoblastic leukemia antigen
- CK:
-
Cytokeratin
- EGF:
-
Epidermal growth factor
- EMA:
-
Epithelial membrane antigen
- EpCAM:
-
Epithelial cell adhesion molecule
- ER:
-
Estrogen receptor
- ESA:
-
Epithelial-specific antigen
- HIM:
-
Human-in-mouse
- HMEC:
-
Human mammary epithelial cell
- MaSC:
-
Mammary stem cell
- ME:
-
Myoepithelial
- MRUs:
-
Mammary repopulating units
- MUC1:
-
Mucin-1
- PR:
-
Progesterone receptor
- TDLU:
-
Terminal ductal lobular unit
- TEB:
-
Terminal end bud
- vHMEC:
-
Variant human mammary epithelial cell
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Acknowledgments
We apologize to the authors whose work we could not cite due to space limitations. This work was supported by grants from the ACS-New England Division-Broadway on Beachside Postdoctoral Fellowship (PK), the Raymond and Beverly Sackler Foundation (PK and CK), the Breast Cancer Research Foundation (CK), the DOD Breast Cancer Research Program (PK, CK), the NIH/NCI (CK, LA), the National Center for Research Resources (LA), and the Breast Cancer Alliance (LA).
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Keller, P.J., Arendt, L.M., Kuperwasser, C. (2013). Human Mammary Epithelial Stem/Progenitor Cells. In: Sell, S. (eds) Stem Cells Handbook. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4614-7696-2_17
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DOI: https://doi.org/10.1007/978-1-4614-7696-2_17
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