Hepatocyte heparan sulfate proteoglycan (HSPG)

Hepatocyte heparan sulfate proteoglycans (HSPGs) are a diverse group of cell-surface and extracellular matrix molecules, with Syndecan-1 and Glypican-3 being the most prominent members in the liver. They function primarily as co-receptors that facilitate the binding and internalization of various ligands, including growth factors, cytokines, and triglyceride-rich lipoproteins. In healthy physiology, they are essential for the clearance of lipoprotein remnants from the blood and the regulation of hepatocyte growth and regeneration through the modulation of Wnt and FGF signaling pathways. However, they also serve as the initial attachment sites for several pathogens, such as Hepatitis B and C viruses and Malaria sporozoites, enabling their entry into liver cells. In pathology, Glypican-3 is highly overexpressed in hepatocellular carcinoma, making it a valuable diagnostic biomarker and a major therapeutic target for monoclonal antibodies and CAR-T cell therapies. Therapeutic strategies targeting these molecules range from glycan mimetics designed to block viral attachment to targeted immunotherapy against the proteoglycan core proteins in oncology.

Other names

Hepatic heparan sulfate proteoglycanLiver heparan sulfate proteoglycanSyndecan-1 (SDC1)Glypican-3 (GPC3)Syndecan-4Hepatic HSPG

Competitive inhibition of viral or ligand binding to heparan sulfate chains; antibody-mediated neutralization or depletion of the core protein; inhibition of heparanase-mediated degradation of the extracellular matrix.