Mucus Viscosity

Mucus viscosity is a measure of the thickness and stickiness of mucus, a viscoelastic secretion present at mucosal surfaces throughout the body. It arises from the concentration, structure, and interactions of gel-forming mucins, DNA, proteins, lipids, and water[1][4][6]. Physiologically, mucus viscosity is crucial for effective mucociliary or peristaltic clearance and for forming protective barriers that trap pathogens and particulates while allowing selective passage of water, gases, and nutrients[1][3][4][6]. Alterations or pathological increases in mucus viscosity underlie several diseases, particularly in the airways (e.g., cystic fibrosis, COPD, asthma), by impairing clearance and promoting infection and tissue damage[4][6]. Drugs that modulate mucus viscosity include mucolytics, enzymes, and hydrators, which can alter the molecular structure or water content of mucus to restore or reduce its viscosity, thereby improving clearance or drug delivery[4][6]. However, excessive reduction in viscosity may compromise the barrier function of mucus[4]. Summary: "Mucus viscosity" is a functional property, not a discrete therapeutic molecular target or receptor. It describes the biophysical characteristics arising from multiple interacting components of mucus. The misattribution of "mucus viscosity" as a canonical target is incorrect.

Other names

Mucus viscoelasticitymucous viscositysputum viscosityairway mucus viscositymucus rheology

Decrease viscosity by breaking disulfide bonds in mucins (e.g., N-acetylcysteine)[4]; Decrease viscosity by enzymatic degradation of DNA in sputum (e.g., dornase alfa)[4]; Increase hydration of mucus to reduce viscosity (e.g., hypertonic saline, mannitol)[4]