Airway mucous glands and secretions

Airway mucous glands and secretions constitute a vital defense system of the respiratory tract, primarily responsible for mucociliary clearance and protecting the epithelium from environmental insults (StatPearls, 2023). These secretions are a complex mixture of water, electrolytes, and gel-forming mucins, specifically MUC5AC and MUC5B, which are synthesized by goblet cells and submucosal glands (PubMed, PMID: 30054224). In healthy states, they provide a viscoelastic barrier that traps pathogens; however, in pathological conditions like chronic obstructive pulmonary disease (COPD) and cystic fibrosis, mucus hypersecretion and altered rheology lead to airway obstruction (NIH, 2022). Therapeutic strategies often focus on modulating these secretions through mucolytics, which reduce viscosity by breaking disulfide bonds, or anticholinergics, which inhibit glandular secretion by targeting muscarinic receptors (StatPearls, 2023). Understanding the regulation of these glands is crucial for developing treatments that restore normal airway clearance without compromising the protective barrier. Effective management of airway secretions is a cornerstone of therapy for chronic inflammatory lung diseases (PubMed, PMID: 29107550).

Other names

Bronchial glandsSubmucosal glandsAirway mucusTracheobronchial secretionsRespiratory secretions

Mucolysis via reduction of disulfide bonds in mucin polymers; Antimuscarinic inhibition of submucosal gland secretion; Osmotic hydration of the airway surface liquid; Enzymatic degradation of extracellular DNA in purulent secretions; Stimulation of secretomotor activity to increase mucus volume and decrease viscosity.