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Branching morphogenesis in the avian lung: electron microscopic studies using cationic dyes.
Journal of Embryology and Experimental Morphology
|June 1, 1986
Summary
Developing chick lungs show cell filopodia crossing the basal lamina, which is thin and discontinuous at tips. These findings in avian lung development offer insights into branching morphogenesis strategies.
Area of Science:
- Developmental Biology
- Cell Biology
- Histology
Background:
- The developing lung undergoes complex epithelial-mesenchymal interactions.
- Understanding the structural dynamics of the basal lamina is crucial for lung morphogenesis.
Purpose of the Study:
- To investigate the ultrastructure of the basal lamina in developing chick lungs.
- To identify cell contacts and structural features of the basement membrane during lung development.
Main Methods:
- Electron microscopy was used to examine chick lung tissue.
- Specialized staining techniques (Ruthenium red, tannic acid, Alcian blue) were employed.
Main Results:
- Cell filopodia were observed crossing the basal lamina between epithelium and mesenchyme.
- The basal lamina was found to be thin and discontinuous at bud tips, with distinct substructures revealed by staining.
- Collagen distribution and orientation were analyzed in relation to morphogenetic stability.
Conclusions:
- The developing chick lung exhibits structural characteristics of the basal lamina similar to mammalian lung development.
- Avian lung morphogenesis likely employs strategies conserved across mammalian species.
- Detailed ultrastructural analysis provides insights into the dynamic nature of the extracellular matrix during organogenesis.