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BAL fluid 8-isoprostane concentrations in eosinophilic bronchitis and asthma
Jiaxing Xie1, Qingling Zhang, Nanshan Zhong
1State Key Laboratory of Respiratory Disease, Guangzhou Medical College, The First Affiliated Hospital, Guangzhou, Guangdong, China.
Background:
Oxidative stress has an important role in the pathophysiology of asthma. But oxidative stress of airway has not been assessed in patients with nonasthmatic eosinophilic bronchitis (EB). 8-epi-prostaglandin F2alpha (8-isoprostane) is a biomarker of oxidative stress.
Objectives:
We sought to determine whether oxidative stress (measured by 8-isoprostane) occurs in EB and whether 8-isoprostane is associated with airway function in EB and asthma.
Methods:
We measured 8-isoprostane concentrations in the bronchoalveolar lavage (BAL) fluid from 11 subjects with EB, 10 subjects with asthma, and 9 healthy control subjects. 8-isoprostane was measured by enzyme immunoassays.
Results:
We found that BAL fluid 8-isoprostane concentrations were raised both in EB and asthma. The median concentrations of 8-isoprostane in BAL fluid were significantly higher in subjects with asthma (12.78 pg/mL) when compared with EB (8.34 pg/mL) and healthy control subjects (5.07 pg/mL).
Conclusions:
Our study shows that oxidative stress is increased significantly in asthmatic subjects and the degree of oxidative stress in EB subjects is milder than that in asthma, as reflected by 8-isoprostane concentrations in the BAL fluid. The difference in airway function observed in subjects with EB and asthma could be associated with different elevation in 8-isoprostane concentration in the airways.
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