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Cell Stem Cell. 2013 Jul 3;13(1):117-30. doi: 10.1016/j.stem.2013.05.004. Epub 2013 Jun 13.

Molecular profiling of human mammary gland links breast cancer risk to a p27(+) cell population with progenitor characteristics.

Author information

1
Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA 02215, USA.

Abstract

Early full-term pregnancy is one of the most effective natural protections against breast cancer. To investigate this effect, we have characterized the global gene expression and epigenetic profiles of multiple cell types from normal breast tissue of nulliparous and parous women and carriers of BRCA1 or BRCA2 mutations. We found significant differences in CD44(+) progenitor cells, where the levels of many stem cell-related genes and pathways, including the cell-cycle regulator p27, are lower in parous women without BRCA1/BRCA2 mutations. We also noted a significant reduction in the frequency of CD44(+)p27(+) cells in parous women and showed, using explant cultures, that parity-related signaling pathways play a role in regulating the number of p27(+) cells and their proliferation. Our results suggest that pathways controlling p27(+) mammary epithelial cells and the numbers of these cells relate to breast cancer risk and can be explored for cancer risk assessment and prevention.

PMID:
23770079
PMCID:
PMC3703476
DOI:
10.1016/j.stem.2013.05.004
[Indexed for MEDLINE]
Free PMC Article

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