Stem cells are dispensable for lung homeostasis but restore airways after injury

Adam Giangreco, Esther N Arwert, Ian R Rosewell, Joshua Snyder, Fiona M Watt, Barry R Stripp

Research output: Contribution to journalArticlepeer-review

206 Citations (Scopus)


Local tissue stem cells have been described in airways of the lung but their contribution to normal epithelial maintenance is currently unknown. We therefore developed aggregation chimera mice and a whole-lung imaging method to determine the relative contributions of progenitor (Clara) and bronchiolar stem cells to epithelial maintenance and repair. In normal and moderately injured airways chimeric patches were small in size and not associated with previously described stem cell niches. This finding suggested that single, randomly distributed progenitor cells maintain normal epithelial homeostasis. In contrast we found that repair following severe lung injury resulted in the generation of rare, large clonal cell patches that were associated with stem cell niches. This study provides evidence that epithelial stem cells are dispensable for normal airway homeostasis. We also demonstrate that stem cell activation and robust clonal cellular expansion occur only during repair from severe lung injury.

Original languageEnglish
Pages (from-to)9286-91
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number23
Publication statusPrint publication - 9 Jun 2009
Externally publishedYes


  • Animals
  • Bronchioles/cytology
  • Epithelial Cells/cytology
  • Female
  • Homeostasis
  • Lung/cytology
  • Male
  • Mice
  • Stem Cells/cytology


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