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Airway inflammation in smokers with nonobstructive and obstructive chronic bronchitis
M Linden1, J B Rasmussen, E Piitulainen
1Pharmacology 1 and 2, Research and Development Department, Astra Draco AB, Lund, Sweden.
The American Review of Respiratory Disease
|November 1, 1993
Summary
Airway inflammation in smokers with chronic bronchitis (CB) differs based on obstruction. Obstructed CB patients show lower inflammatory cells and higher specific markers in lavage fluids, indicating distinct inflammatory profiles.
Area of Science:
- Pulmonary Medicine
- Respiratory Research
- Inflammation Biology
Background:
- Chronic bronchitis (CB) and chronic obstructive pulmonary disease (COPD) are significant smoking-related respiratory diseases.
- Airway inflammation is a key characteristic of CB and COPD, but its specific manifestations in relation to obstruction are not fully understood.
Purpose of the Study:
- To investigate the location and characteristics of airway inflammation in smokers with CB and COPD.
- To compare inflammatory profiles between obstructed and non-obstructed CB patients.
Main Methods:
- Airway lavage was performed on smokers with CB, COPD with CB, asymptomatic smokers, and healthy non-smokers.
- Bronchial lavage (BL) and bronchoalveolar lavage (BAL) fluids were analyzed for inflammatory cell composition.
- Levels of glutathione, myeloperoxidase (MPO), and eosinophil cationic protein (ECP) were measured in BAL fluid.
Main Results:
- All smoker groups exhibited ongoing airway inflammation.
- CB patients with airway obstruction had significantly lower inflammatory cell concentrations in both BL and BAL fluids compared to non-obstructed CB patients.
- Airway obstruction (reduced FEV1) correlated significantly with higher concentrations of glutathione, MPO, and ECP in BAL fluid.
Conclusions:
- The inflammatory process in the airways of smokers with CB differs depending on the presence or absence of airway obstruction.
- Specific biomarkers (glutathione, MPO, ECP) are elevated in obstructed CB patients, suggesting distinct inflammatory pathways.