Cell-surface sialic acid-containing glycoprotein

Cell-surface sialic acid-containing glycoproteins are a diverse class of membrane proteins modified with terminal sialic acid residues, which play a pivotal role in mediating cell-cell interactions and maintaining the glycocalyx structure. These molecules are essential for biological processes such as immune system regulation, where they act as ligands for inhibitory Siglec receptors to prevent autoimmunity (Varki, 2008). In oncology, the overexpression of these sialylated glycoproteins, known as hypersialylation, serves as a potent immune evasion mechanism by creating a 'sialic acid shield' that suppresses T-cell and NK-cell activity (Pearce & Läubli, 2016). Furthermore, many respiratory viruses, including influenza, exploit these glycoproteins as receptors for cell entry and rely on their cleavage for viral egress (Stencel-Baerenwald et al., 2014). Therapeutic strategies targeting this class include sialidase-based biologics designed to strip sialic acids from tumor cells to restore anti-tumor immunity and neuraminidase inhibitors that block viral spread (Palleon Pharmaceuticals, 2023). Given their ubiquity, these glycoproteins represent a broad but critical target landscape for both infectious disease and immuno-oncology.

Other names

SialoglycoproteinSialylated cell-surface proteinSialic acid-bearing glycoproteinSialylated glycoprotein

Enzymatic removal of terminal sialic acid residues (desialylation) to enhance immune recognition or inhibition of neuraminidase enzymes to prevent viral release (Varki, 2008; Palleon Pharmaceuticals, 2023).