Heparan sulfate glycosaminoglycan (HSGAG) (HSGAG)

Heparan sulfate glycosaminoglycans (HSGAGs) are complex, linear polysaccharides found on the cell surface and within the extracellular matrix of almost all animal tissues (Bishop et al., 2007, Nature). They consist of repeating disaccharide units that undergo extensive enzymatic modifications, such as sulfation and epimerization, creating specific patterns that serve as docking sites for hundreds of signaling proteins (Sarrazin et al., 2011, Cold Spring Harb Perspect Biol). By acting as essential co-receptors, HSGAGs regulate the activity of growth factors like FGF and VEGF, thereby controlling cell proliferation, migration, and tissue development (Knelson et al., 2014, Nat Rev Cancer). In disease, HSGAGs are frequently dysregulated; for instance, cancer cells overexpress the enzyme heparanase to degrade HSGAGs, facilitating tumor invasion and angiogenesis (Vlodavsky et al., 2012, Matrix Biology). Additionally, many pathogens, including SARS-CoV-2 and herpes simplex virus, utilize HSGAGs as initial attachment receptors to facilitate host cell entry (Clausen et al., 2020, Cell). Therapeutic interventions include heparin mimetics designed to competitively inhibit these interactions or small molecules that block heparanase activity (Hammond et al., 2014, J Med Chem). However, the structural complexity of HSGAGs and their broad physiological roles make achieving high therapeutic specificity a significant challenge for drug development.

Other names

Heparan sulfateHSHS-GAGHeparan sulphate

Competitive inhibition of ligand binding to cell-surface HSGAGs and inhibition of the endoglycosidase heparanase to prevent extracellular matrix remodeling.