Platelet-derived endothelial cell growth factor (PD-ECGF)

Platelet-derived endothelial cell growth factor (PD-ECGF) is a 45 kDa single-chain polypeptide originally purified from human platelets and placental tissue[2][4]. It acts as a potent, selective mitogen and chemotactic factor for endothelial cells, stimulating their DNA synthesis, migration, and promoting angiogenesis in vivo[2][4]. PD-ECGF is a novel type of growth factor distinct in sequence and structure from classical platelet-derived growth factors (PDGFs) and is molecularly identical to thymidine phosphorylase, an enzyme involved in nucleotide metabolism. It is produced by platelets, placental tissue, various normal and transformed cells, and lacks a classical signal peptide, resulting in retention mainly within producer cells[2][4]. PD-ECGF is implicated in pathological neovascularization (notably in cancers, where its expression correlates with metastatic potential and poor prognosis) and may play roles in physiological processes such as wound healing and maintenance of vascular integrity[2][4]. Its enzymatic activity is exploited clinically in cancer chemotherapy, and its inhibition represents a therapeutic strategy in oncology and anti-angiogenic therapy. Note: PD-ECGF should not be confused with platelet-derived growth factors (PDGFs), which are a family of dimeric polypeptide growth factors (e.g., PDGF-A, PDGF-B) involved in broader mitogenic and mesenchymal cell regulation pathways[1][5]. While related in discovery and overlapping in function (both can promote angiogenesis), they are distinct molecules, with different gene products, protein structure, and pharmacological importance.

Other names

PD-ECGFPlatelet derived endothelial cell growth factorThymidine phosphorylaseGliostatin

Enzyme inhibition (direct inhibition of thymidine phosphorylase/PD-ECGF activity inhibits angiogenesis, and tipiracil inhibits enzymatic breakdown of trifluridine to extend its cytotoxic effect in cancer) Anti-angiogenic (blockade curtails new vessel formation, critical for tumor growth and some vascular pathologies)