Respiratory tract mucus secretion

Respiratory tract mucus secretion refers to the physiological process by which specialized epithelial cells—primarily goblet cells and submucosal gland cells—produce and release mucus into the airways. This gel-like substance consists mainly of water, high-molecular-weight glycoproteins called mucins (notably MUC5AC from goblet cells and MUC5B from both goblet cells and submucosal glands), along with salts, lipids, proteins, DNA fragments, immune molecules, and cellular debris. The primary biological role is to trap inhaled particles—including dust, microbes, allergens—and facilitate their removal via coordinated ciliary movement toward the pharynx for swallowing or expectoration. This mechanism forms a critical first-line defense against environmental insults while maintaining hydration on airway surfaces. The regulation of this process involves complex neural (cholinergic), hormonal/autonomic signals as well as local inflammatory mediators. Pathologically increased respiratory tract mucus secretion ("hypersecretion") contributes significantly to morbidity in diseases like asthma, COPD/chronic bronchitis, cystic fibrosis—and can result from chronic inflammation or infection leading to increased expression/synthesis/secretion of mucins plus goblet cell hyperplasia.[1][2][3][4] Importantly: "Respiratory tract mucus secretion" describes a process, not an individual molecule/receptor/therapeutic target per se; thus it does not fit standard definitions used for drug targets like enzymes or receptors.[1]

Other names

Airway mucus secretionMucus production in respiratory tractAirway mucin secretionMucociliary clearance

Drugs act by various mechanisms including: Inhibition of cholinergic signaling to reduce glandular/goblet cell activity; Breakdown of mucin polymers to decrease viscosity; Suppression of inflammatory mediators that drive hypersecretion.