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Sequential changes in canine pulmonary epithelial and endothelial cell functions after nitrogen dioxide.
S F Man1, D J Williams, R A Amy
1Department of Medicine, University of Alberta, Edmonton, Canada.
The American Review of Respiratory Disease
|July 1, 1990
Summary
Nitrogen dioxide (NO2) exposure caused temporary lung injury, including edema and reduced lung function, in dogs. However, the pulmonary endothelium
Area of Science:
- Environmental toxicology
- Pulmonary physiology
- Respiratory medicine
Background:
- Nitrogen dioxide (NO2) is an environmental pollutant known to cause lipid peroxidation.
- Potential effects of NO2 on pulmonary epithelium and endothelium require investigation.
Purpose of the Study:
- To assess the impact of NO2 exposure on pulmonary epithelial permeability and endothelial function in dogs.
- To evaluate changes in lung function and bronchoalveolar lavage (BAL) fluid following NO2 inhalation.
Main Methods:
- Mongrel dogs were exposed to 200 or 400 ppm NO2 for 1 hour.
- Pulmonary epithelial permeability was measured using a radioaerosol technique.
- Endothelial function was assessed by measuring the clearance of radiolabeled serotonin (5-HT) and prostaglandin E1 (PGE1).
- Bronchoalveolar lavage (BAL) fluid was analyzed for cell population and albumin content.
Main Results:
- Focal pulmonary edema and increased albumin in BAL fluid were observed within two days post-exposure.
- Radioaerosol clearance was delayed, and functional residual capacity (FRC) decreased slightly.
- Pulmonary endothelial function, indicated by 5-HT and PGE1 removal, remained unaltered.
- All physiological abnormalities resolved over 14 days.
Conclusions:
- Short-term NO2 exposure induces transient pulmonary edema and impairs lung function.
- Pulmonary endothelial function is resistant to acute NO2-induced injury.
- The lung exhibits a capacity for recovery from NO2-related damage.