Related Experiment Videos
Changes in lung tissue fibronectin content and synthesis during postnatal lung growth
D J Plumb1, B A Dubaybo, L A Thet
1Department of Pediatrics, Duke University Medical Center, Durham, North Carolina.
Pediatric Pulmonology
|November 1, 1987
Summary
Fibronectin content and synthesis in rat lungs increase during rapid postnatal lung growth and alveolar development. These levels then sharply decline as lung growth and remodeling slow down.
Area of Science:
- Pulmonary biology
- Extracellular matrix research
- Developmental biology
Background:
- Fibronectin is crucial for cell differentiation, migration, adhesion, and extracellular matrix organization.
- Postnatal mammalian lung growth involves rapid cell proliferation and alveolar septal formation.
Purpose of the Study:
- To investigate the role of fibronectin in postnatal lung development.
- To quantify changes in lung tissue fibronectin content and synthesis during rat lung growth.
Main Methods:
- Rats were sacrificed at postnatal days 4, 7, 11, 14, and 21.
- Lung tissue fibronectin content was measured using enzyme-linked immunoassay after extraction with urea and heparin.
- Fibronectin synthesis was assessed by measuring 35S-methionine incorporation into immunoprecipitated fibronectin.
Main Results:
- Lung tissue fibronectin content doubled between days 4 and 7, peaked around day 14, and decreased sharply by day 21.
- Fibronectin synthesis increased steadily from day 4 to day 14, reaching a peak, then decreased sharply by day 21.
- These changes correlated with periods of active lung cell proliferation and alveolar formation, followed by decreased lung growth.
Conclusions:
- Fibronectin plays a significant role during the active phases of postnatal lung growth and alveolarization.
- The dynamic changes in fibronectin content and synthesis reflect its involvement in lung development and remodeling.