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Zeibecoglou, K; Ying, Sun; Meng, Q; Robinson, Ds; Kay, Ab; Macfarlane, Aj; Barnes, Nc; Pavord, I
Allergy (Copenhagen), July 1999, Letnik: 54, Številka: 7Journal Article
Background: Eosinophils are believed to be critical proinflammatory cells in airway mucosal damage in asthma. Eotaxin is a C‐C chemokine with selective activity for eosinophils and basophils. Previous studies have shown increased expression of eotaxin in the airways of asthmatics at baseline. We aimed to investigate eotaxin expression during the late‐phase reaction to allergen inhalation in atopic asthmatics. Methods: Sputum induction was performed before and 24 h after inhalational allergen challenge in atopic asthmatics, and eotaxin protein was detected immunocytochemically. Results: Thirteen patients with a mean decrease in forced expiratory volume in 1 s of 28% (±1.5) during the early asthmatic reaction, and 39% (±4.7) during the late asthmatic reaction produced sufficient sputum for study. The percentage of eosinophils in sputum was increased 24 h after allergen challenge (P<0.004), and eosinophil percentages in sputum after challenge correlated with the magnitude of the late‐phase reaction (r=0.56, P=0.05). The percentage of eotaxin‐positive cells increased from 12.6% (range 2–43.8) to 24.3% (8.1–47.1, P<0.005). Allergen‐induced increases in eotaxin‐positive cells correlated with increases in eosinophils (r=0.63, P<0.01). Conclusions: These findings suggest that eotaxin may contribute to allergen‐induced recruitment of eosinophils to the airway in asthmatic subjects.
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