Abstract
The reproductive capacity of the mammary epithelial stem cell is reduced coincident with the number of symmetric divisions it must perform. In a study of FVB/N mice with the transgene, WAP-TGFβ1, we discovered that mammary epithelial stem cells were prematurely aged due to ectopic expression of TGF-β1. To test whether premature aging of mammary epithelial stem cells would have an impact on susceptibility or resistance to mammary cancer, female littermates from FVB/N×WAP-TGF-β1 mating were injected with mouse mammary tumor virus (MMTV) at 8–10 weeks of age. A total of 44 females were inoculated, maintained as breeders and observed for tumor development for up to 18 months. Only one mammary tumor appeared in 17 TGF-β1 females while 15 were collected from 29 wild type sisters. Premalignant mammary epithelial cells in infected glands were identified by transplantation of single cell (1×105) suspensions into nulliparous hosts and testing for hyperplastic outgrowth. Although the number of positive takes was significantly reduced with TGF-β1 cells, both MMTV-infected TGF-β1 and wild type cells produced hyperplastic outgrowths suggesting that premalignant transformation was achieved in each group. The results suggest a positive correlation between the procreative life-span of mammary epithelial stem cells and mammary cancer risk.
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Boulanger, C., Smith, G. Reducing mammary cancer risk through premature stem cell senescence. Oncogene 20, 2264–2272 (2001). https://doi.org/10.1038/sj.onc.1204312
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DOI: https://doi.org/10.1038/sj.onc.1204312
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