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Lack of type II cells and emphysema in human lungs
C J Otto-Verberne1, A A Ten Have-Opbroek, L N Willems
1Dept of Pulmonology, School of Medicine, University of Leiden, The Netherlands.
Insights
Type II alveolar cells may play a role in emphysema development. Lower percentages of these cells correlated with increased emphysema severity in human lung tissue samples.
Area of Science:
- Pulmonary Medicine
- Cell Biology
- Pathology
Background:
- Emphysema is a chronic lung disease characterized by alveolar destruction.
- Type II alveolar epithelial cells are crucial for lung repair and surfactant production.
- The specific role of type II cells in emphysema pathogenesis remains unclear.
Purpose of the Study:
- To investigate the relationship between the abundance of type II alveolar epithelial cells and the severity of emphysema.
- To explore the potential involvement of type II cells in the pathological processes of emphysema.
Main Methods:
- Analysis of ten surgically removed human lungs or lobes.
- Quantification of type II alveolar epithelial cell abundance using a specific antibody (SALS-Hu).
- Morphometric assessment of emphysema severity using parameters like destructive index (DI) and mean linear intercept (Lm).
Main Results:
- A significant negative correlation was observed between the percentage of type II cells and the destructive index (rs = 0.55; p = 0.02).
- Correlation coefficients were calculated for type II cell abundance, small airways disease score, lung function, age, and smoking habits.
- Findings suggest a potential role for type II cells in the development of emphysema.
Conclusions:
- The study indicates a significant association between reduced type II alveolar epithelial cell abundance and increased emphysema severity.
- Type II cells may be involved in the pathogenesis of emphysema, warranting further investigation.
- These findings contribute to understanding the cellular mechanisms underlying emphysema.
Abstract:
Ten surgically removed human lungs or lobes were studied, to assess the relationship between the abundance of type II alveolar epithelial cells and the degree of emphysema. Type II cell abundance (total number as well as percentage of the total parenchymal cell population) was determined in sections of randomly selected tissue samples of these lungs or lobes by using a type II cell specific antibody specific anti-lavage serum (SALS-Hu), which recognizes surfactant-associated proteins. In these tissue samples we also determined the degree of emphysema with the aid of a number of morphometric parameters, destructive index (DI), mean linear intercept (Lm in mm), and the number of normal alveolar attachments on (pre)terminal bronchioles (normal AA.mm.1). We subsequently calculated the Spearman rank correlation coefficients (rs) between the abundance of type II cells and parameters for emphysema. We found a significant negative correlation between the percentage of type II cells and DI at tissue sample level (rs = 0.55; p = 0.02). We also calculated correlation coefficients between the abundance of type II cells and the degree of small airways disease in (pre)terminal and respiratory bronchioles (SADscore), lung function, age and smoking habits. The results suggest a role for type II cells in the pathogenesis of emphysema.