Alveolar stem cells transdifferentiate to drive bronchiolar regeneration.

Alveolar type 2 cells actively migrate into injured bronchioles and transdifferentiate into airway cells, revealing a new cross-compartmental repair mechanism in the lung.

• Why it matters: Understanding how different lung compartments repair themselves is crucial for developing therapies for airway injuries, as current knowledge is limited to epithelial stem cell mobilization within compartments.
• What they did: Using dual-recombinase lineage tracing in mice, the study tracked 100% of alveolar type 2 cells, demonstrating their migration and transformation into club and ciliated cells after bronchial injury.
• The result: This discovery highlights alveolar cells' plasticity in airway regeneration, offering potential targets like SPP1, ITGB1, and Notch pathways to enhance lung repair strategies.