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Identification of quiescent and spatially restricted mammary stem cells that are hormone responsive

  • Nai Yang Fu
  • , Anne C. Rios
  • , Bhupinder Pal
  • , Charity W. Law
  • , Paul Jamieson
  • , Ruijie Liu
  • , François Vaillant
  • , Felicity Jackling
  • , Kevin He Liu
  • , Gordon K. Smyth
  • , Geoffrey J. Lindeman
  • , Matthew E. Ritchie
  • , Jane E. Visvader

Research output: Contribution to journalArticlepeer-review

107 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)164-176
Number of pages13
JournalNature Cell Biology
Volume19
Issue number3
DOIs
Publication statusPublished - 1 Mar 2017
Externally publishedYes

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