Cited by 1,776Neonatal Respiratory Health ResearchInterstitial Lung Diseases and Idiopathic Pulmonary FibrosisTransplantation: Methods and Outcomes

Type 2 alveolar cells are stem cells in adult lung

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Barkauskas, Christina E., Cronce, Michael J., Rackley, Craig R., Bowie, Emily J., Keene, Douglas R., Stripp, Barry R., Randell, Scott H., Noble, Paul W. +1 more·2013·Journal of Clinical Investigation

Abstract

Gas exchange in the lung occurs within alveoli, air-filled sacs composed of type 2 and type 1 epithelial cells (AEC2s and AEC1s), capillaries, and various resident mesenchymal cells. Here, we use a combination of in vivo clonal lineage analysis, different injury/repair systems, and in vitro culture of purified cell populations to obtain new information about the contribution of AEC2s to alveolar maintenance and repair. Genetic lineage-tracing experiments showed that surfactant protein C-positive (SFTPC-positive) AEC2s self renew and differentiate over about a year, consistent with the population containing long-term alveolar stem cells. Moreover, if many AEC2s were specifically ablated, high-resolution imaging of intact lungs showed that individual survivors undergo rapid clonal expansion and daughter cell dispersal. Individual lineage-labeled AEC2s placed into 3D culture gave rise to self-renewing "alveolospheres," which contained both AEC2s and cells expressing multiple AEC1 markers, including HOPX, a new marker for AEC1s. Growth and differentiation of the alveolospheres occurred most readily when cocultured with primary PDGFRα⁺ lung stromal cells. This population included lipofibroblasts that normally reside close to AEC2s and may therefore contribute to a stem cell niche in the murine lung. Results suggest that a similar dynamic exists between AEC2s and mesenchymal cells in the human lung.

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Authors
Barkauskas, C. E., Cronce, M. J., Rackley, C. R., Bowie, E. J., Keene, D. R., Stripp, B. R., Randell, S. H., Noble, P. W., & Hogan, B. L. M.
Affiliations
  • Duke University (US)
  • Shriners Hospitals for Children (US)
  • Cedars-Sinai Medical Center (US)
  • University of North Carolina at Chapel Hill (US)
Venue
Journal of Clinical Investigation
Published
2013-06-10
Volume
123
Issue
7
Pages
3025-3036
ISSN
0021-9738 (ISSN-L)
OpenAlex
W2050308681
Cited by
1,776
References
49
Citations by year
2026: 126 · 2025: 167 · 2024: 167 · 2023: 179 · 2022: 193 · 2021: 207 · 2020: 181 · 2019: 121 · 2018: 109 · 2017: 99 · 2016: 74 · 2015: 78 · 2014: 60 · 2013: 12
FWCI
60.69
Type
journal article
Language
en
Open access
Locations
  • Journal of Clinical Investigation (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Carolina Digital Repository (University of North Carolina at Chapel Hill) (submittedVersion)
  • UNC Libraries
Funders
National Heart, Lung, and Blood Institute (P01HL108793, T32HL007538, R37HL071303, U01HL111018, R01HL060539, T32HL098099, UO1HL111018)
Topics
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Neonatal Respiratory Health Research
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Interstitial Lung Diseases and Idiopathic Pulmonary Fibrosis
  • Health Sciences › Medicine › Surgery › Transplantation: Methods and Outcomes
Keywords
alveolar stem cells, lung regeneration, alveolar repair, clonal lineage tracing, surfactant protein C, self-renewal, clonal expansion, HOPX, lipofibroblasts, stem cell niche, lung injury
MeSH terms
Animals, Cell Differentiation, Cells, Cultured, Lung, Mice, Inbred C57BL, Mice, Transgenic, Stromal Cells, Coculture Techniques, Cell Lineage, Receptor, Platelet-Derived Growth Factor alpha, Cell Proliferation, Mice, Adult Stem Cells, Stem Cell Niche, Lung Injury, Alveolar Epithelial Cells, Mice, 129 Strain

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