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Nat Med. 2008 Dec;14(12):1384-9. doi: 10.1038/nm.1791. Epub 2008 Nov 23.

A method for quantifying normal human mammary epithelial stem cells with in vivo regenerative ability.

Author information

1
Terry Fox Laboratory, British Columbia Cancer Agency, 675 West Tenth Avenue, Vancouver, British Columbia, Canada.

Abstract

Previous studies have demonstrated that normal mouse mammary tissue contains a rare subset of mammary stem cells. We now describe a method for detecting an analogous subpopulation in normal human mammary tissue. Dissociated cells are suspended with fibroblasts in collagen gels, which are then implanted under the kidney capsule of hormone-treated immunodeficient mice. After 2-8 weeks, the gels contain bilayered mammary epithelial structures, including luminal and myoepithelial cells, their in vitro clonogenic progenitors and cells that produce similar structures in secondary transplants. The regenerated clonogenic progenitors provide an objective indicator of input mammary stem cell activity and allow the frequency and phenotype of these human mammary stem cells to be determined by limiting-dilution analysis. This new assay procedure sets the stage for investigations of mechanisms regulating normal human mammary stem cells (and possibly stem cells in other tissues) and their relationship to human cancer stem cell populations.

PMID:
19029987
DOI:
10.1038/nm.1791
[Indexed for MEDLINE]

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