Comparison of the effects of marchantin C and fucoidan on sFlt-1 and angiogenesis in glioma microenvironment.

Objectives: This study aimed to examine the effects of marchantin C and fucoidan on angiogenesis induced by glioma cells and monocytes, and to elucidate the role of sFlt-1 in this process.

Methods: T98G glioma cells and THP1 monocytes were pretreated with marchantin C or fucoidan, respectively. Conditioned media were used for endothelial cell tube formation assay and detection of sFlt-1 by ELISA. Depletion of sFlt-1 was achieved by a neutralizing antibody to assess its role in the process.

Key Findings: Marchantin C inhibited angiogenesis induced by T98G cells while fucoidan inhibited both T98G and THP1 cell-induced angiogenesis. In all three groups in which angiogenesis was inhibited, sFlt-1 level in the supernatants was elevated. Pretreatment of the conditioned media with sFlt-1 antibody restored the inhibited angiogenesis to a certain degree.

Conclusions: This study suggested for the first time that marchantin C and fucoidan could significantly inhibit angiogenesis induced by glioma cells or monocytes. Up-regulation of sFlt-1 played an important role in this process.