In vitro safety of ketotifen as a topical nasal rinse

BackgroundKetotifen is a second ‐generation noncompetitive H1‐antihistamine and mast‐cell stabilizer. It is commonly used to treat or prevent allergic conjunctivitis, asthma, chronic urticaria, anaphylaxis, mast‐cell, and other allergic‐type disorders. However, it has never been studied in aspirin‐exacerbated respirato ry disease (AERD), an aggressive phenotype of chronic rhinosinusitis with nasal polyps, where the mast cell plays a prominent role its pathogenesis.MethodsHuman sinonasal epithelial cells were grown at an air ‐liquid interface (ALI). Ketotifen powder was dissolved in saline to make 4 test solutions at 1.04, 2.08, 10.4, and 20.8 µg/mL. Control (saline) or ketotifen solution was added apically to ALI cultures from tissue of 5 unique patients, and ciliary beat frequency (CBF) changes were recorded. Lacta te dehydrogenase was measured at 24 and 48 hours to estimate long‐term cellular toxicity.ResultsApical application of ketotifen at all concentrations was neither ciliotoxic nor ciliostimulatory, with no change in CBF over a period of 15 minutes after application. Cellular toxicity for all concentrations at 24 and 48 hours after application was
Source: International Forum of Allergy and Rhinology - Category: Allergy & Immunology Authors: Tags: ORIGINAL ARTICLE Source Type: research

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