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American Journal of Respiratory and Critical Care Medicine Vol 166. pp. 1128-1134, (2002)
© 2002 American Thoracic Society

Articles

Effect of Combining Salmeterol and Fluticasone on the Progression of Airway Remodeling

Nele J. Vanacker, Els Palmans, Romain A. Pauwels and Johan C. Kips

Department of Respiratory Diseases, Ghent University Hospital, Ghent, Belgium

Correspondence and requests for reprints should be addressed to Nele Vanacker, B.Pharm., Department of Respiratory Diseases, Ghent University Hospital, De Pintelaan 185, B-9000 Ghent, Belgium. E-mail: Nele.Vanacker{at}barclab.com

ABSTRACT

In subjects insufficiently controlled with low to moderate doses of inhaled corticosteroids, adding ß-agonists is clinically more beneficial than increasing the dose of inhaled corticosteroids. In the present study, we investigated the effect of adding salmeterol to fluticasone on allergen-induced airway inflammation and remodeling. Sensitized rats, in which characteristics of remodeling had been induced by ovalbumin exposure every 2 days from Days 14 to 28, were further exposed to ovalbumin or PBS from Days 29 to 42. During the last 2 weeks, before allergen exposure, rats were treated with aerosolized fluticasone propionate (10 mg), salmeterol (1 mg), salmeterol (1 mg) plus fluticasone propionate (10 mg), or placebo. After 4 weeks of ovalbumin exposure, the airways showed inflammatory changes, goblet cell hyperplasia, and enhanced fibronectin and collagen deposition. Salmeterol in monotherapy decreased bronchoalveolar lavage fluid eosinophil number but had no influence on structural changes. Combining salmeterol with fluticasone propionate counteracted goblet cell hyperplasia, but increased the amount of fibronectin and collagen in the airway wall. These effects of salmeterol did not influence airway responsiveness. We conclude that the combination of salmeterol and fluticasone propionate enhances aspects of allergen-induced airway remodeling. This is not accompanied by changes in airway responsiveness.

Key Words: asthma • corticosteroids • long-acting ß-agonists • remodeling • salmeterol




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