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Reversible transdifferentiation of alveolar epithelial cells
S I Danto1, J M Shannon, Z Borok
1Will Rogers Institute Pulmonary Research Center, University of Southern California, Los Angeles 90033, USA.
Summary
Alveolar epithelial type II cells can change into type I cells, but this process is reversible. Maintaining cell differentiation requires continuous regulatory signals.
Area of Science:
- Pulmonary biology
- Cellular differentiation
- Epithelial cell biology
Background:
- Alveolar epithelial type II (AT2) cells are traditionally considered progenitors of type I (AT1) cells in adult lungs.
- The dynamic relationship and potential for transdifferentiation between AT2 and AT1 cells require further investigation.
Purpose of the Study:
- To investigate the potential for reversible transdifferentiation between AT2 and AT1 cells.
- To examine the role of regulatory input in maintaining differentiated cell states.
Main Methods:
- Isolation and culture of AT2 cells on attached and detached collagen gels.
- Analysis of cell morphology and AT1 cell phenotype expression using electron microscopy and a specific monoclonal antibody (mAb VIII B2).
Main Results:
- Alveolar epithelial cells (AECs) on attached gels acquired AT1 cell characteristics.
- AECs on gels detached on day 1 retained AT2 cell features and did not react with mAb VIII B2.
- The AT1 cell phenotype expressed on attached gels was reversed upon detachment of the gels.
Conclusions:
- Continuous regulatory input is necessary for maintaining differentiated AT1 and AT2 cell lineages.
- Transdifferentiation between AT2 and AT1 cells is a reversible process, suggesting plasticity in alveolar epithelial cell identity.