Airway mucosal secretion pathways

Airway mucosal secretion pathways represent the coordinated physiological processes responsible for the production, hydration, and clearance of mucus in the respiratory system (Fahy & Dickey, 2010, NEJM). These pathways involve the synthesis of gel-forming mucins, primarily MUC5AC and MUC5B, by goblet cells and submucosal glands, which are regulated by neural (muscarinic), inflammatory (IL-13), and environmental stimuli (Rogers, 2007, Paediatr Respir Rev). Effective mucociliary clearance also depends on ion transport mechanisms, such as the Cystic Fibrosis Transmembrane Conductance Regulator (CFTR) and the Epithelial Sodium Channel (ENaC), which maintain the hydration of the airway surface liquid (Boucher, 2007, Biol Chem). In chronic respiratory diseases like asthma, COPD, and cystic fibrosis, these pathways are often overactivated or impaired, leading to mucus hypersecretion and airway obstruction (StatPearls, 2024). Pharmacological interventions target these pathways through various mechanisms, including muscarinic antagonists to reduce secretion, CFTR modulators to improve hydration, and mucolytics to decrease mucus viscosity (Fahy & Dickey, 2010, NEJM).

Other names

Airway mucus secretionMucociliary clearance pathwaysBronchial secretion pathways

Pharmacological modulation involves inhibiting muscarinic M3 receptors to decrease glandular secretion, activating CFTR to increase airway surface liquid hydration, using mucolytic agents to break disulfide bonds, or employing PDE3/4 inhibitors (Ensifentrine) to reduce inflammation and secretion, thereby facilitating clearance (Fahy & Dickey, 2010, NEJM; StatPearls, 2024).