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Epithelium smooth muscle regulation and interactions
1The Sackler Institute of Pulmonary Pharmacology, Department of Respiratory Medicine, King's College School of Medicine and Dentistry, London, United Kingdom. domenico.spina@kcl.ac.uk
American Journal of Respiratory and Critical Care Medicine
|November 17, 1998
Summary
The airway epithelium, once thought a simple barrier, actively regulates airway smooth muscle function. This research highlights the epithelium's crucial role in modulating airway responses.
Area of Science:
- Respiratory physiology
- Cell biology
Background:
- The vascular endothelium's role beyond a barrier was established in the 1980s, revealing its function in releasing modulating substances.
- Similarly, the airway epithelium was recognized as more than a passive barrier against airborne irritants.
Purpose of the Study:
- To investigate the multifaceted functions of the airway epithelium.
- To understand the epithelium's role in regulating airway smooth muscle.
Main Methods:
- Review of studies from the 1980s in vascular and respiratory fields.
- Analysis of the cellular composition and enzymatic activities of the airway epithelium.
- Examination of substances released by the epithelium and their effects on target cells.
Main Results:
- The airway epithelium comprises at least eight cell types with diverse functions, including ciliary motility and mucus secretion.
- Epithelial cells contain enzymes that metabolize arachidonic acid and peptides, and degrade various peptides and amines.
- The epithelium releases substances that actively regulate the function of nerves and airway smooth muscle.
Conclusions:
- The airway epithelium plays a significant, active role in the regulation of human airway smooth muscle.
- These findings underscore the importance of the epithelium in respiratory system homeostasis and function.