Cell-surface glycoprotein carbohydrate moiety

Cell-surface glycoprotein carbohydrate moieties, commonly referred to as cell-surface glycans, are complex oligosaccharide chains covalently attached to proteins embedded in the plasma membrane (Varki, 2017, Glycobiology). These glycans play critical roles in biological processes such as cell-cell recognition, adhesion, and signaling by serving as ligands for various receptors, including lectins and selectins (Magnani, 2004, Glycobiology). In many diseases, particularly cancer and chronic inflammation, the glycosylation patterns of these proteins become altered, leading to the expression of tumor-associated carbohydrate antigens (TACAs) (Pinho & Reis, 2015, Nature Reviews Cancer). These aberrant glycans facilitate metastasis, immune evasion, and pathogen entry, making them attractive targets for therapeutic intervention (NIH, Essentials of Glycobiology). Drugs targeting these moieties often function by mimicking the glycan structure to competitively inhibit binding or by using antibodies and lectins to specifically recognize and neutralize the glycan-bearing cells. Despite their potential, targeting glycans remains challenging due to their structural diversity and the widespread presence of similar carbohydrate structures on healthy cells (Varki, 2017, Glycobiology).

Other names

Cell-surface glycansGlycoprotein glycansOligosaccharide side chainsSurface carbohydratesTumor-associated carbohydrate antigensTACAsGlycosylation

Drugs targeting these moieties primarily act through competitive inhibition of glycan-lectin or glycan-selectin interactions, preventing cell adhesion and signaling (Magnani, 2004, Glycobiology). Other mechanisms include the inhibition of enzymes like neuraminidase that modify these carbohydrate structures to prevent viral release (NIH, Essentials of Glycobiology), or the use of monoclonal antibodies to induce immune-mediated destruction of cells expressing specific tumor-associated carbohydrate antigens (Pinho & Reis, 2015, Nature Reviews Cancer).