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Expression of macrophage surface markers in induced sputum of patients with chronic obstructive pulmonary disease
J Domagała-Kulawik1, M Maskey-Warzechowska, J Hermanowicz-Salamon
1Department of Pneumology and Allergology, Warsaw Medical University, Warsaw, Poland. jokula@amwaw.edu.pl
Abstract:
The aim of our study was to evaluate cellular content in induced sputum in chronic obstructive pulmonary disease (COPD) in relation to the degree of airway obstruction, macrophage count, and phenotype. We compared the proportion of macrophages and cells expressing the following markers: CD11b, CD14, CD54, and CD71 in induced sputum obtained from patients with mild-to-moderate and severe COPD (n=29)], asymptomatic smokers (n=18), and nonsmokers (n=18). The differential cell count and macrophage phenotypes were examined in induced sputum by immunocytochemistry. We observed a greater proportion of neutrophils and eosinophils and an elevated macrophage count in patients with COPD and in smokers in comparison with nonsmokers. Macrophages in patients with severe airway obstruction were characterized by a significantly elevated expression of CD11b and CD14 markers. There were higher proportions of macrophages with expression of CD11b, CD14, CD54, and CD71 in induced sputum of smokers in comparison with nonsmokers. We concluded that macrophages are the cells involved in the inflammatory process caused by smoking in COPD. The macrophage phenotype with elevated CD11b and CD14 expressions was associated with severe airflow limitation.
Insights
Macrophages play a key role in smoking-related inflammation in chronic obstructive pulmonary disease (COPD). Specific macrophage phenotypes with elevated CD11b and CD14 markers are linked to severe airflow limitation in COPD patients.
Area of Science:
- Pulmonary Medicine
- Immunology
- Cell Biology
Background:
- Chronic obstructive pulmonary disease (COPD) is a major global health issue characterized by persistent respiratory symptoms and airflow limitation.
- Inflammatory processes, particularly involving macrophages, are central to COPD pathogenesis.
- Smoking is the primary risk factor for COPD, but the specific cellular mechanisms remain under investigation.
Purpose of the Study:
- To investigate the cellular composition and macrophage phenotypes in induced sputum of patients with varying degrees of COPD and in asymptomatic smokers.
- To correlate cellular findings with the severity of airway obstruction and smoking status.
Main Methods:
- Induced sputum was collected from patients with mild-to-moderate and severe COPD, asymptomatic smokers, and healthy non-smokers.
- Differential cell counts were performed.
- Immunocytochemistry was used to examine macrophage phenotypes, specifically the expression of CD11b, CD14, CD54, and CD71.
Main Results:
- Patients with COPD and smokers exhibited higher proportions of neutrophils, eosinophils, and macrophages compared to non-smokers.
- Macrophages from severe COPD patients showed significantly increased expression of CD11b and CD14.
- Smokers displayed higher proportions of macrophages expressing CD11b, CD14, CD54, and CD71 compared to non-smokers.
Conclusions:
- Macrophages are critically involved in the inflammatory response associated with smoking in COPD.
- Elevated expression of CD11b and CD14 on macrophages is associated with severe airflow limitation in COPD.
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