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Published on: December 17, 2017
Chronic bronchitis sub-phenotype within COPD: inflammation in sputum and biopsies
J B Snoeck-Stroband1, T S Lapperre, M M E Gosman
1Dept of Pulmonology, Leiden University Medical Center, Lung Function Lab C2-P, PO Box 9600, NL-2300 RC Leiden, The Netherlands. J.B.Snoeck-Stroband@lumc.nl
The European Respiratory Journal
|September 7, 2007
Summary
Chronic bronchitis in chronic obstructive pulmonary disease (COPD) patients is linked to a distinct inflammatory profile. This suggests COPD with chronic bronchitis may represent a unique inflammatory sub-phenotype.
Area of Science:
- Pulmonary Medicine
- Immunology
- Respiratory Research
Background:
- Chronic obstructive pulmonary disease (COPD) is characterized by airway inflammation.
- Chronic bronchitis presence predicts a faster decline in forced expiratory volume in one second (FEV1) in COPD patients.
- Understanding the inflammatory differences in COPD patients with and without chronic bronchitis is crucial for targeted therapies.
Purpose of the Study:
- To investigate the distinct inflammatory cell profiles in COPD patients with and without chronic bronchitis.
- To compare inflammatory cell counts in bronchial biopsies and induced sputum between these patient groups.
- To determine if chronic bronchitis represents a specific inflammatory sub-phenotype within COPD.
Main Methods:
- Analysis of inflammatory cell counts in bronchial biopsies and induced sputum from 114 COPD patients.
- Patients were categorized based on the presence or absence of chronic bronchitis symptoms.
- Logistic regression was used to analyze differences, adjusting for smoking and sex.
Main Results:
- COPD patients with chronic bronchitis exhibited lower eosinophil counts in bronchial biopsies compared to those without.
- Conversely, patients with chronic bronchitis showed higher percentages of sputum eosinophils.
- Differences in sputum macrophages and neutrophils were observed, potentially influenced by smoking and sex.
Conclusions:
- Chronic bronchitis in COPD patients is associated with a distinct inflammatory sub-phenotype.
- Results suggest a preferential distribution of eosinophils towards the airway lumen in COPD patients with chronic bronchitis.
- These findings may inform anti-inflammatory treatment strategies for COPD patients presenting with chronic bronchitis.
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