MUC5AC and rhinitis: As a continuation of this study, and taking into account the potential adverse effects of first-line drugs for the treatment of rhinitis and related diseases, such as corticosteroids and antihistamines, on the nasal structure and ciliary function [16], this study has assessed the effects of Rhinosectan® on nasal functioning in a MucilAirTM airway tissue model (in terms of cilia beating frequency, mucin secretion, mucociliary clearance and phagocytic activity).