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Fluticasone propionate protects against ozone-induced airway inflammation and modified immune cell activation markers in healthy volunteers.

  • Author(s): Alexis, Neil E
  • Lay, John C
  • Haczku, Angela
  • Gong, Henry
  • Linn, William
  • Hazucha, Milan J
  • Harris, Brad
  • Tal-Singer, Ruth
  • Peden, David B
  • et al.

Published Web Location

https://doi.org/10.1289/ehp.10981
Abstract

Ozone exposure induces airway neutrophilia and modifies innate immune monocytic cell-surface phenotypes in healthy individuals. High-dose inhaled corticosteroids can reduce O(3)-induced airway inflammation, but their effect on innate immune activation is unknown.We used a human O(3) inhalation challenge model to examine the effectiveness of clinically relevant doses of inhaled corticosteroids on airway inflammation and markers of innate immune activation in healthy volunteers.Seventeen O(3)-responsive subjects [>10% increase in the percentage of polymorphonuclear leukocytes (PMNs) in sputum, PMNs per milligram vs. baseline sputum] received placebo, or either a single therapeutic dose (0.5 mg) or a high dose (2 mg) of inhaled fluticasone proprionate (FP) 1 hr before a 3-hr O(3) challenge (0.25 ppm) on three separate occasions at least 2 weeks apart. Lung function, exhaled nitric oxide, sputum, and systemic biomarkers were assessed 1-5 hr after the O(3) challenge. To determine the effect of FP on cellular function, we assessed sputum cells from seven subjects by flow cytometry for cell-surface marker activation.FP had no effect on O(3)-induced lung function decline. Compared with placebo, 0.5 mg and 2 mg FP reduced O(3)-induced sputum neutrophilia by 18% and 35%, respectively. A similar effect was observed on the airway-specific serum biomarker Clara cell protein 16 (CCP16). Furthermore, FP pretreatment significantly reduced O(3)-induced modification of CD11b, mCD14, CD64, CD16, HLA-DR, and CD86 on sputum monocytes in a dose-dependent manner.This study confirmed and extended data demonstrating the protective effect of FP against O(3)-induced airway inflammation and immune cell activation.

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