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Anatomy of Clara cell secretion: surface changes observed by scanning electron microscopy
M N Peão1, A P Aguas, C M de Sá
1Department of Anatomy, Abel Salazar Institute for the Biomedical Sciences, Porto, Portugal.
Journal of Anatomy
|June 1, 1993
Summary
Chronic lung inflammation stimulates Clara cells to secrete via apocrine and merocrine pathways. Scanning electron microscopy revealed distinct phases of cap-like body formation and release from these bronchiolar cells.
Area of Science:
- Pulmonary Biology
- Cell Biology
- Respiratory Medicine
Background:
- Clara cells are crucial for lung airway maintenance and repair.
- Their secretory function is vital but not fully understood, especially under inflammatory conditions.
Purpose of the Study:
- To investigate the microanatomical changes in Clara cell surface during secretion.
- To characterize the mechanism of Clara cell secretion under chronic inflammation.
Main Methods:
- Induction of chronic lung inflammation in rats using bleomycin.
- High-resolution scanning electron microscopy of lung airway tissues.
- Analysis of Clara cell surface morphology during secretory events.
Main Results:
- Bleomycin-induced inflammation significantly increased Clara cell secretion (31% vs. 6.3%).
- Clara cell secretion involves three phases: dome formation, basal narrowing into a cap-like body, and release.
- Secretion occurs via apocrine (predominant) and merocrine mechanisms, with or without pedicles.
Conclusions:
- Cap-like bodies are genuine secretory structures of Clara cells.
- Clara cell secretion is primarily apocrine, with merocrine contribution.
- Chronic inflammation enhances Clara cell secretory activity and cap-like body release.