Abstract:
BACKGROUND:COPD is characterized by chronic airflow limitation and inflammation of the respiratory tract. Several inflammatory biomarkers have been evaluated in COPD but are poorly related to disease severity and progression. Osteoprotegerin (OPG) is a glycoprotein mediator that is expressed in the lung and macrophages, so we have studied its concentration in induced sputum and macrophages of patients with COPD. METHODS:OPG was measured by enzyme-linked immunosorbent assay in induced sputum of patients with COPD and control subjects. RESULTS:OPG concentrations in induced sputum of patients with COPD (18.7 ± 18.6 ng/mL, n = 39) were significantly higher than those of healthy smokers (8.1 ± 5.6 ng/mL, n = 15), healthy nonsmokers (3.5 ± 3.8 ng/mL, n = 14), or patients with asthma (8.0 ± 5.4 ng/mL, n = 18). Sputum OPG levels in COPD negatively correlated with FEV(1) and positively correlated with residual volume to total lung capacity ratio (RV/TLC) (r = 0.55, P < .05), transfer factor of the lung for carbon monoxide (r = -0.53, P < .05), and carbon monoxide transfer coefficient (r = -0.61, P < .01). By contrast, sputum IL-8 concentrations were related to disease severity but not to RV/TLC or gas diffusion. Airway macrophages and neutrophils were positive for OPG by immunocytochemistry in sputum and peripheral lung tissue. OPG induced matrix metalloproteinase-9 release from sputum macrophages in vitro. CONCLUSIONS:Sputum OPG may be a useful biomarker to monitor parenchymal destruction in COPD.
journal_name
Chestjournal_title
Chestauthors
To M,Ito K,Ausin PM,Kharitonov SA,Barnes PJdoi
10.1378/chest.10-1608subject
Has Abstractpub_date
2011-07-01 00:00:00pages
76-83issue
1eissn
0012-3692issn
1931-3543pii
S0012-3692(11)60349-8journal_volume
140pub_type
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