Mucin glycoproteins in airway secretions (predominantly Mucin 5B and Mucin 5AC) (MUC5B, MUC5AC)

Mucoproteins in airway secretions are highly glycosylated proteins, primarily belonging to the mucin family. The most abundant and functionally relevant mucoproteins in the airway are Mucin 5B (MUC5B) and Mucin 5AC (MUC5AC), which cross-link to form the viscoelastic gel characteristic of airway mucus[1][4]. These molecules are essential for trapping and clearing inhaled debris and pathogens via ciliary movement (mucociliary clearance), and for maintaining airway hydration and protection. Mucoprotein production and secretion are tightly regulated at baseline for homeostasis and are markedly upregulated during inflammation and infections. Overproduction or dysregulated secretion results in airway obstruction, chronic bronchitis, asthma, cystic fibrosis, and other mucus-related pulmonary pathologies. The secretion of airway mucins proceeds via regulated exocytosis, involving the SNARE complex, Munc13-2, Munc18b, VAMP8, and auxiliary regulators such as Rab3D, SNAP23, and syntaxin isoforms[1][2]. Mucoproteins as a collective group are the targets for current and prospective therapies aiming to modulate airway mucus in disease. Note: "Mucoproteins in airway secretions" should be replaced by the full, specific mucin names (e.g., "Mucin 5B", "Mucin 5AC") if a canonical molecular target is required.

Other names

Mucoproteinsairway mucinsmucus glycoproteinsgel-forming mucinsairway secretory mucins

Mucolytics: Reduce viscosity and aid clearance of mucin gels Anti-inflammatory agents: Downregulate mucin gene expression (e.g., block IL-13 or IL-1β mediated upregulation) Inhibitors of exocytosis (targeting SNARE complexes, Munc13-2, Munc18b, VAMP8)