Mucosal glycans and epithelial glycoproteins

Mucosal glycans and epithelial glycoproteins are complex macromolecules that form the primary biochemical and physical barrier of the respiratory, gastrointestinal, and urogenital tracts. These molecules, predominantly mucins such as MUC2, MUC5AC, and MUC1, are characterized by extensive O-glycosylation that provides structural integrity, lubrication, and hydration to the mucus layer (Hollingsworth & Swanson, 2004). Biologically, they serve as a critical interface for host-microbe interactions, acting as decoys for pathogens to prevent epithelial adhesion while supporting the colonization of beneficial commensal bacteria (Tailford et al., 2015). In disease states like inflammatory bowel disease (IBD), gastritis, and cystic fibrosis, alterations in glycan structure or mucin expression lead to barrier dysfunction and chronic inflammation (Corfield, 2015). In oncology, aberrant glycosylation patterns, such as the expression of Sialyl-Lewis X or truncated O-glycans (Tn antigen), promote tumor metastasis and immune evasion (Pinho & Reis, 2015). Therapeutic strategies include mucoprotective agents like rebamipide, which enhances mucin secretion, and mucolytics like N-acetylcysteine, which reduce mucus viscosity by breaking disulfide bonds (Iijima et al., 2009).

Other names

MucinsGlycocalyxMucosal barrierO-glycansN-glycansEpithelial mucus layerCell-surface glycoproteins

Stimulation of mucin secretion, physical stabilization of the mucosal barrier, competitive inhibition of pathogen binding, and reduction of mucus viscosity through disulfide bond cleavage.