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Changes in alveolar septal border lengths with postnatal lung growth
J P Wood1, J E Kolassa, J T McBride
1Department of Pediatrics, University of Rochester, Rochester, New York 14642, USA.
The American Journal of Physiology
|December 9, 1998
Summary
Lung development in adult ferrets shows increased alveolar complexity, with more bends and free ends in septal borders. This suggests septation is not the primary driver of later lung growth.
Area of Science:
- Pulmonary biology
- Comparative anatomy
- Morphometrics
Background:
- Alveolar development evaluation traditionally uses counting.
- Postnatal lung growth involves complex parenchymal changes beyond rapid septation.
Purpose of the Study:
- To assess postseptation parenchymal development using alveolar septal border lengths.
- To investigate changes in the elastin fiber network's role in lung complexity.
Main Methods:
- Measurement of alveolar septal border lengths (ends, bends, junctions) in ferret lungs.
- Use of Miller's elastin stain and light microscopy on perfusion-fixed, dehydrated lung sections.
- Standard morphometric analysis scaled for lung volume.
Main Results:
- Adult ferrets showed significantly greater scaled lengths of free septal ends (23%) and bends (37%) compared to weanlings.
- Bends increased disproportionately more than ends, and both increased more than junctions.
- No significant difference in scaled junction lengths was observed between age groups.
Conclusions:
- Increased alveolar septal bends and ends in adult ferrets indicate greater parenchymal complexity with growth.
- The observed changes suggest mechanisms other than septation are predominant in later postnatal lung development.
- Increased bends may contribute to enhanced alveolar gas-exchanging surface area in growing lungs.