Insights into the molecular roles of heparan sulfate proteoglycans (HSPGs-syndecans) in autocrine and paracrine growth factor signaling in the pathogenesis of Hodgkin's lymphoma

Syndecans (SDC, SYND) comprise a group of four structurally related type 1 transmembrane heparan sulfate proteoglycans (HSPGs) that play important roles in tumorigenic processes. SDCs exert signaling via their protein cores and their conserved transmembrane and cytoplasmic domains or by forming complexes with growth factors (GFs). In classical Hodgkin's lymphoma (cHL), a lymphoid neoplasm of predominantly B cell origin, SDC1 and SDC4 are the active SDCs, and a number of GF (vascular endothelial growth factor, fibroblast growth factor, etc.) signaling pathways have been studied. However, despite extensive pre-clinical and clinical research on SDC-mediated GF signaling in many cancer types, there is very limited data for this interaction in cHL. Thus, this review highlights the relevant literature focusing on the potential interactions of SDCs and GFs in cHL pathogenesis. Also discussed are the pre-clinical and clinical studies targeting signaling through these pathways.