Assessment of bronchoalveolar cell and mediator response to isocapnic hyperpnea in asthma

The American Review of Respiratory Disease
L B PlissB M Pichurko

Abstract

The purpose of this study was to test the hypothesis that mediators and cells associated with bronchoconstriction or inflammation are locally synthesized and/or released in the airways of asthmatic subjects in response to isocapnic hyperpnea (ISH). Seven atopic, mildly asthmatic subjects were studied. Baseline measurements were reported previously and included forced expiratory volumes, flow rates, bronchoalveolar lavage (BAL), and methacholine reactivity. Approximately 1 yr later, spirometry and BAL were repeated, but BAL was performed immediately after ISH challenge. As indices of inflammation, BAL measurements were made of eosinophils, neutrophils, epithelial cells, leukotrienes B4, C4, D4, and E4, prostaglandins D2, E2, and F2 alpha, thromboxane B2, histamine, and total protein. Compared with baseline, ISH was associated with higher BAL concentrations of the following: leukotriene B4 (10 versus 121 pg/ml, p = 0.02), leukotrienes C4/D4/E4 (46 versus 251 pg/ml, p = 0.02), eosinophils (0.8 versus 2.2%, p = 0.04), and epithelial cells (2.1 versus 6.1%, p = 0.05). Trends toward significant increases were seen in BAL concentrations of neutrophils and prostaglandin D2. No statistically significant increases were found in BAL measu...Continue Reading

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