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Secretory product expression during Clara cell differentiation in the rabbit and rat
W V Cardoso1, L G Stewart, K E Pinkerton
1Department of Pathology, Faculty of Medicine, University of British Columbia, Vancouver, Canada.
The American Journal of Physiology
|June 1, 1993
Summary
Clara cell secretory protein (CCSP) maturation occurs after birth in rats and rabbits, with rats showing earlier development. This involves changes in organelles and protein levels, varying by species.
Area of Science:
- Pulmonary Biology
- Cellular Differentiation
- Respiratory System Development
Background:
- Nonciliated Clara cells in bronchiolar epithelium synthesize Clara cell secretory protein (CCSP).
- CCSP is a small-molecular-mass secretory protein crucial for lung function.
- Understanding Clara cell differentiation is key to respiratory health.
Purpose of the Study:
- To compare the emergence of secretory function during Clara cell differentiation in rabbits and rats.
- To investigate the temporal dynamics of CCSP synthesis and storage.
- To correlate organelle changes with secretory protein maturation.
Main Methods:
- Ultrastructural morphometry of lung tissue from fetal and postnatal rabbits and rats.
- Immunohistochemistry using antibodies against CCSP.
- Quantification of secretory granules and rough endoplasmic reticulum abundance.
Main Results:
- Secretory granules increased postnatally, reaching adult levels earlier in rats (1 week) than rabbits (3-4 weeks).
- Rough endoplasmic reticulum abundance decreased with age, contrasting with granule development.
- CCSP levels rose postnatally, with earlier attainment of adult levels in rats (1 week) compared to rabbits (3 weeks).
Conclusions:
- Clara cell secretory function matures postnatally, involving decreased biosynthetic organelles.
- CCSP expression and secretory granule abundance are closely associated during maturation.
- The timing and cellular machinery for Clara cell maturation differ significantly between rats and rabbits.