Samenvatting
Despite accumulating evidence for a mammary differentiation hierarchy, the basal compartment comprising stem cells remains poorly characterized. Through gene expression profiling of Lgr5 + basal epithelial cells, we identify a new marker, Tetraspanin8 (Tspan8). Fractionation based on Tspan8 and Lgr5 expression uncovered three distinct mammary stem cell (MaSC) subsets in the adult mammary gland. These exist in a largely quiescent state but differ in their reconstituting ability, spatial localization, and their molecular and epigenetic signatures. Interestingly, the deeply quiescent MaSC subset (Lgr5 + Tspan8 hi) resides within the proximal region throughout life, and has a transcriptome strikingly similar to that of claudin-low tumours. Lgr5 + Tspan8 hi cells appear to originate from the embryonic mammary primordia before switching to a quiescent state postnatally but can be activated by ovarian hormones. Our findings reveal an unexpected degree of complexity within the adult MaSC compartment and identify a dormant subset poised for activation in response to physiological stimuli.
| Originele taal-2 | Engels |
|---|---|
| Pagina's (van-tot) | 164-176 |
| Aantal pagina's | 13 |
| Tijdschrift | Nature Cell Biology |
| Volume | 19 |
| Nummer van het tijdschrift | 3 |
| DOI's | |
| Status | Gepubliceerd - 1 mrt. 2017 |
| Extern gepubliceerd | Ja |