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Effects of topical anti‐inflammatory drugs on eosinophil survival primed by epithelial cells. Additive effect of glucocorticoids and nedocromil sodium
Author(s) -
MULLOL J.,
LÓPEZ E.,
ROCAFERRER J.,
XAUBET A.,
PUJOLS L.,
FERNÀNDEZMORATA J. C.,
FABRA J. M.,
PICADO C.
Publication year - 1997
Publication title -
clinical and experimental allergy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.462
H-Index - 154
eISSN - 1365-2222
pISSN - 0954-7894
DOI - 10.1046/j.1365-2222.1997.1750975.x
Subject(s) - eosinophil , nedocromil sodium , budesonide , nedocromil , fluticasone , pharmacology , fluticasone propionate , eosinophil cationic protein , medicine , triamcinolone acetonide , immunology , corticosteroid , chemistry , asthma , placebo , pathology , respiratory disease , alternative medicine , lung
Summary Background Eosinophil infiltration is a hallmark of the inflammatory response in rhinitis and in nasal polypcsis. Objective We studied the effect of steroids and nedocromil sodium on eosinophil survival primed by epithelial cells from healthy (nasal mucosa) and inflamed (nasal polyp) respiratory tissue. Methods Blood eosinophils were incubated with increasing concentrations (10 ‐11 10 ‐5 M) of topical steroids (fiuticasone propionate, budesonide, triamcinolone acetonide and beclomethasone dipropionate) and/or nedocromil sodium prior to the addition of human epithelial cell conditioned media (HECM), eosinophil viability was measured and IC 50 for each drug was calculated. Results All four steroids and nedocromil sodium caused a dose‐related inhibition of HECM‐induced eosinophil survival. The IC 50 of steroids were lower in eosinophils primed by mucosa HECM than on those primed by polyp HECM (fluticasone, 4nM vs 114nM: budesonide, 21 nM vs 280 nM; triamcinolone, 7 nM vs 853 nM; and beclomethasone, 171 nM vs 181 nM). The combined inhibitory effect of 10 ‐7 M budesonide plus 10 ‐5 M nedocromil (43.8 ± 10.8%, P < 0.03) was significantly higher than budesonide (28.5 ± 9.2%) or nedocromil (16.7 ± 5.4%) alone and close to 10 ‐5 M budesonide (52.3 ± 11%). No differences were found in cytokine (IL‐8, IL‐6, GM‐CSF, TNFα, IL‐lβ and RANTES) concentrations between HECM from mucosa and polyps. Conclusion These results suggest that topical anti‐inflammatory drugs may diminish airway eosinophilic infiltration by decreasing eosinophil viability, that nasal polyp epithelial cell secretions may induce steroid resistance in eosinophils, and that nedocromil sodium has additive effects with steroids.