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Distinct Airway Epithelial Stem Cells Hide among Club Cells but Mobilize to Promote Alveolar Regeneration
Open accessAbstract
Lung injury activates specialized adult epithelial progenitors to regenerate the epithelium. Depending on the extent of injury, both remaining alveolar type II cells (AEC2s) and distal airway stem/progenitors mobilize to cover denuded alveoli and restore normal barriers. The major source of airway stem/progenitors other than basal-like cells remains uncertain. Here, we define a distinct subpopulation (∼5%) of club-like lineage-negative epithelial progenitors (LNEPs) marked by high H2-K1 expression critical for alveolar repair. Quiescent H2-K1 high cells account for virtually all in vitro regenerative activity of airway lineages. After bleomycin injury, H2-K1 cells expand and differentiate in vivo to alveolar lineages. However, injured H2-K1 cells eventually develop impaired self-renewal with features of senescence, limiting complete repair. Normal H2-K1 high cells transplanted into injured lungs differentiate into alveolar cells and rescue lung function. These findings indicate that small subpopulations of specialized stem/progenitors are required for effective lung regeneration and are a potential therapeutic adjunct after major lung injury.
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“Senescence-mediated loss of progenitor cell capabilities among AT2 and basal cell populations has been implicated in the impaired reepithelialization of damaged alveoli and airways (62).”
From Lung epithelial and endothelial damage, loss of tissue repair, inhibition of fibrinolysis, and cellular senescence in fatal COVID-19 (2021) · cites this paper as [62]
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Metadata
- Authors
- Kathiriya, J. J., Brumwell, A. N., Jackson, J. R., Tang, X., & Chapman, H. A.
- Affiliations
- University of California, San Francisco (US)
- Shanghai Medical College of Fudan University (CN)
- Corresponding author
- Chapman, Harold A.
- Venue
- Cell Stem Cell
- Publisher
- Elsevier BV
- Published
- 2020-03
- Volume
- 26
- Issue
- 3
- Pages
- 346-358.e4
- ISSN
- 1875-9777 (ISSN-L)
- 1934-5909
- PMC
- PMC7233183
- OpenAlex
- W3002314962
- Cited by
- 246
- References
- 46
- Citations by year
- 2026: 26 · 2025: 38 · 2024: 42 · 2023: 48 · 2022: 33 · 2021: 33 · 2020: 26
- FWCI
- 19.70
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Cell stem cell (publishedVersion)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- eScholarship (California Digital Library) (submittedVersion)
- Funders
- National Heart, Lung, and Blood Institute
- Topics
- Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Neonatal Respiratory Health Research
- Health Sciences › Medicine › Surgery › Tissue Engineering and Regenerative Medicine
- Health Sciences › Medicine › Hepatology › Liver physiology and pathology
- Keywords
- Clara cells, alveolar regeneration, lung injury, alveolar type II cells, epithelial progenitors, cellular senescence, self-renewal, cell transplantation
- MeSH terms
- Cell Differentiation, Epithelial Cells, Humans, Lung, Stem Cells, Lung Injury, Alveolar Epithelial Cells
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