Design, synthesis and in vitro biological evaluation of a small cyclic peptide as inhibitor of vascular endothelial growth factor binding to neuropilin-1

Abstract

Neuropilin-1 (NRP-1) is a co-receptor of VEGFR (vascular endothelial growth factor receptor), but it is also suggested that NRP-1 in tumour cells may serve as a separate receptor for VEGF165. Therefore molecules interfering with VEGF165 binding to NRP-1 seem to be promising candidates as new anti-angiogenic and anti-tumour drugs. Here, we report the design, synthesis, biological evaluation and molecular modelling of the small cyclic peptide, which shows a good inhibitory effect on VEGF165/NRP-1 binding (IC50=0.18μM). The reported compound could be considered as one of the smallest cyclic peptides (MW=510) interfering with VEGF165/NRP-1 binding presented up to now.