
Mutations in the FOXF1 gene are associated with alveolar capillary dysplasia with misalignment of pulmonary veins (ACDMPV), a severe congenital lung disorder. The study used murine lung organoids to show that the S52F FOXF1 mutation in ACDMPV patients stimulates canonical WNT/β-catenin signaling in type 2 alveolar epithelial cells, leading to increased proliferation of these cells and decreased differentiation into type 1 alveolar epithelial cells. The activation of canonical WNT/β-catenin signaling was associated with decreased expression of noncanonical WNT5A ligand in lung fibroblasts. Mechanistically, FOXF1 directly activates the Wnt5a gene transcription through an evolutionarily conserved region. Activation of either FOXF1 or WNT5A may provide a strategy to improve lung function in patients with ACDMPV.
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