Abstract
Breast cancer stem cells, the root of tumor growth, present challenges to investigate: Primary human breast cancer cells are difficult to establish in culture and inconsistently yield tumors after transplantation into immune-deficient recipient mice. Furthermore, there is limited characterization of mammary cancer stem cells in mice, the ideal model for the study of breast cancer. We herein describe a pre-clinical breast cancer stem cell model, based on the properties of cancer stem cells, derived from transgenic MMTV-PyMT mice. Using a defined set of cell surface markers to identify cancer stem cells by flow cytometry, at least four cell populations were recovered from primary mammary cancers. Only two of the four populations, one epithelial and one mesenchymal, were able to survive and proliferate in vitro. The epithelial population exhibited tumor initiation potential with as few as 10 cells injected into syngeneic immune-competent recipients. Tumors initiated from injected cell lines recapitulated the morphological and physiological components of the primary tumor. To highlight the stemness potential of the putative cancer stem cells, B lymphoma Mo-MLV insertion region 1 homolog (Bmi-1) expression was knocked down via shRNA targeting Bmi-1. Without Bmi-1 expression, putative cancer stem cells could no longer initiate tumors, but tumor initiation was rescued with the introduction of a Bmi-1 overexpression vector in the Bmi-1 knockdown cells. In conclusion, our data show that primary mammary cancers from MMTV-PyMT mice contain putative cancer stem cells that survive in culture and can be used to create a model for study of mammary cancer stem cells.
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Abbreviations
- Bmi-1:
-
B lymphoma Mo-MLV insertion region 1 homolog
- BSA:
-
Bovine serum albumin
- BrdU:
-
5-bromo-2-deoxyuridine
- CK:
-
Cytokeratin
- CSC:
-
Cancer stem cell
- DMEM:
-
Dulbecco’s Modified Eagle Medium
- EGFP:
-
Enhanced green fluorescent protein
- FACS:
-
Fluorescence-activated cell sorting
- FBS:
-
Fetal bovine serum
- FITC:
-
Fluorescein isothiocyanate
- FMMC:
-
Female mouse mammary cancer cell line
- FVB/NJ:
-
Friend Virus B NIH Jackson mouse strain
- HBSS:
-
Hank’s buffered salt solution
- MCF:
-
Michigan Cancer Foundation cell line
- MMMC:
-
Male mouse mammary cancer cell line
- MMTV-PyMT:
-
Mouse mammary tumor virus promoter-polyoma middle T-antigen
- MSCs:
-
Mesenchymal stem cells
- PBS:
-
Phosphate buffered saline
- RA:
-
All-trans retinoic acid
- SMA:
-
Smooth muscle actin
- TI:
-
Tumor initiation
- TICs:
-
Tumor-initiating cells
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Acknowledgments
The authors would like to thank Andrew Reilly for his statistical analysis of the TI data.
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This study was supported by NIH R01 CA 112481 (Dr. Sell) and the Ordway Research Institute (Dr. Glinsky).
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Ma, J., Lanza, D.G., Guest, I. et al. Characterization of mammary cancer stem cells in the MMTV-PyMT mouse model. Tumor Biol. 33, 1983–1996 (2012). https://doi.org/10.1007/s13277-012-0458-4
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DOI: https://doi.org/10.1007/s13277-012-0458-4