Gastrointestinal epithelial surface glycans (GI glycans)

Gastrointestinal epithelial surface glycans are complex carbohydrate structures, including O-glycans and N-glycans, that are covalently attached to proteins and lipids on the apical surface of the intestinal epithelium (Essentials of Glycobiology, 2022). They form the structural backbone of the glycocalyx and the overlying mucus layer, acting as a primary defense mechanism and a mediator of host-microbe interactions (Nature Reviews Microbiology, 2020). These glycans serve as attachment sites for commensal microbiota, helping to maintain gut homeostasis, but are also exploited by pathogens like Helicobacter pylori and Rotavirus for colonization and entry (Cell Host & Microbe, 2018). In diseases such as ulcerative colitis and Crohn's disease, there is a documented shift in glycosylation patterns, often characterized by reduced complexity and increased expression of truncated glycans, which compromises the mucosal barrier (Gastroenterology, 2019). Therapeutic strategies targeting these glycans include the use of glycomimetics to competitively inhibit pathogen binding and the development of lectin-based delivery systems for site-specific drug release (Journal of Controlled Release, 2021). Furthermore, specific glycan epitopes like Sialyl-Lewis X serve as important biomarkers for inflammatory processes and neoplastic transformation in the gut (Clinical Cancer Research, 2020).

Other names

Gut glycocalyxMucosal glycansIntestinal surface carbohydratesEnterocyte surface glycansMucin-associated glycansGastrointestinal glycocalyx

Competitive inhibition of pathogen binding to epithelial receptors, enhancement of the protective mucosal barrier, and modulation of host-microbiota interactions through glycan-mimicry or binding.