“…[1,3] With the exception of HA, which is nonsulfated and only exists as a major component of the ECM, GAGs are attached to cell surfaces and ECM protein cores to form proteoglycans. [2,6,7] Due to their unique position and high anionic character, GAGs modulate several important airway functions, including mucociliary clearance,[4] hydration and water homeostasis,[8,9] inflammation,[2,9,10] angiogenesis,[11] and tissue repair and remodeling of mucosal surfaces. [12] Moreover, accumulating evidence suggests that certain GAGs provide a protective mechanism against injury in asthma,[13,14] bronchitis,[15] chronic obstructive pulmonary disorder (COPD),[2,16,17] allergic rhinitis,[17] and chronic rhinosinusitis (CRS),[18] affording opportunities to develop new therapeutics for upper airway inflammatory diseases.…”