Increase in airway neutrophils after oral but not inhaled corticosteroid therapy in mild asthma

• Published in: Respiratory medicine Vol. 99; no. 2; pp. 200 - 207
• Main Authors: Tien Nguyen, Lan, Lim, Sam, Oates, Timothy, Chung, Kian Fan
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.02.2005; Elsevier; Elsevier Limited
• Subjects: Administration, Inhalation; Administration, Oral; Adult; Anti-Inflammatory Agents - administration & dosage; Apoptosis; Asthma; Asthma - drug therapy; Biological and medical sciences; Bones, joints and connective tissue. Antiinflammatory agents; Bronchodilator Agents - administration & dosage; Budesonide - administration & dosage; Chronic obstructive pulmonary disease, asthma; Corticosteroids; Double-Blind Method; Drug therapy; Eosinophil; Eosinophils - drug effects; Female; Forced Expiratory Volume; Glucocorticoids - administration & dosage; Humans; Male; Medical sciences; Neutrophil; Neutrophils - cytology; Neutrophils - drug effects; Pharmacology. Drug treatments; Pneumology; Prednisolone - administration & dosage; Sputum - chemistry; Steroids; Corticosteroids; PC20; NE; MBP; Neutrophil; MPO; Eosinophil; Asthma; Lung disease; Corticosteroid; Respiratory disease; Granulocyte; Increase; Inhalation; Treatment; Bronchus disease; Obstructive pulmonary disease
• ISSN: 0954-6111; 1532-3064
• DOI: 10.1016/j.rmed.2004.06.007

Background: Neutrophils, in addition to eosinophils, are prominent in the airways of patients with severe asthma who are usually on long-term oral and inhaled corticosteroid treatment. We determined whether inhaled or oral corticosteroid therapy can induce airway neutrophilia. Methods: We performed two separate placebo-controlled studies in which patients with mild asthma were treated with either prednisolone (30mg per day for 7 days; n=9) or placebo tablets (n=8), or with either inhaled budesonide (800μg twice daily for 4 weeks; n=6) or inhaled placebo (n=6). Fiberoptic bronchoscopy was performed before treatment and at day 7 of oral treatment, and at day 28 of inhaled therapy. Bronchial sections were immunostained with an antibody to major basic protein for eosinophils, and with an antibody to neutrophil elastase for neutrophils. Induced sputum was obtained in the prednisolone study. Results: Neutrophils in airway submucosa increased after prednisolone from median 76 to 140/mm2 (P=0.05); this change was higher than that after placebo (P=0.04). Eosinophils decreased from 24 to 9/mm2 (P=0.03), but this was not significantly different from placebo. Eosinophils and neutrophils, and levels of IL-8 and myeloperoxidase in induced sputum did not change after prednisolone. There was no change in neutrophil counts after budesonide, but the reduction in eosinophils was greater than placebo (P=0.05). Budesonide improved bronchial responsiveness, but prednisolone did not. Conclusion: Corticosteroid therapy by the oral but not inhaled route can induce neutrophil recruitment into the airways of patients with mild asthma. This could explain the increase in airway neutrophils observed in severe asthmatics treated with oral corticosteroids.