The anti-angiogenic functions of a polysulfated, cyclic compound, ST104P, were investigated. ST104P exhibited excellent water solubility and low cytotoxicity to endothelial cells. ST104P potently inhibited the secretion of matrix metalloproteinase (MMPs) by endothelial cells. Moreover, ST104 also perturbed the migration and tube formation of endothelial cells. Application of ST104P abolished the neovascularization in chicken choroiallantoic membrane (CAM) in a dose-dependent manner. Besides, repeated administration of ST104P into Lewis lung carcinoma resulted in delayed tumor growth and prolonged the life span of tumor-bearing mice. These results indicated that ST104P inhibited angiogenesis and may hold promises for treatment of cancer and diseases or conditions caused by excessive angiogenesis.
