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Mouse Embryonic Lung Culture, A System to Evaluate the Molecular Mechanisms of Branching
Published on: June 30, 2010
FGF-10 is a chemotactic factor for distal epithelial buds during lung development
W Y Park1, B Miranda, D Lebeche
1Pulmonary Center, Boston University School of Medicine, Boston, Massachusetts 02118, USA.
Developmental Biology
|September 19, 1998
Summary
Fibroblast growth factor-10 (FGF-10) guides lung epithelial buds to specific locations during development by acting as a chemoattractant. FGF-10 requires additional signals for proliferation, but its function is conserved across species.
Area of Science:
- Developmental Biology
- Molecular Biology
- Cell Biology
Background:
- Fibroblast growth factor (FGF) signaling is crucial for respiratory system epithelial branching.
- FGF-10 is a potential key regulator of lung branching morphogenesis due to its expression patterns and in vitro effects.
Purpose of the Study:
- To investigate the role of FGF-10 in directing lung epithelial bud positioning during development.
- To determine if FGF-10 influences epithelial proliferation and differentiation.
Main Methods:
- Cultured embryonic lungs with localized high levels of FGF-10 using FGF-10-soaked heparin beads.
- Analyzed epithelial bud migration, proliferation (BrdU incorporation), and differentiation.
- Investigated the requirement for mesenchymal factors or FGF-7 in FGF-10-induced bud migration.
Main Results:
- FGF-10 demonstrated a potent chemoattractant effect on distal lung epithelium, causing buds to migrate towards the FGF-10 source.
- Epithelial buds formed concentric layers around the FGF-10 bead within 24 hours.
- FGF-10 showed modest proliferative effects on lung epithelium compared to FGF-7 and required additional signals for bud migration in the absence of mesenchyme.
- FGF-10 did not appear to affect early epithelial cell differentiation.
Conclusions:
- FGF-10 acts as a chemoattractant to guide lung epithelial bud positioning.
- FGF-10's chemoattractant function in lung development is conserved, similar to Drosophila FGF orthologs.
- FGF-10's role in lung morphogenesis is complex, involving chemoattraction and requiring cooperative signaling for proliferation and migration.
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