title: Bastadin 6, a spongean brominated tyrosine derivative, inhibits tumor angiogenesis by inducing selective apoptosis to endothelial cells.
abstract: Bastadin 6, a macrocyclic tetramer of a brominated tyrosine derivative, was isolated from a marine sponge and its anti-angiogenic activity was evaluated. Bastadin 6 was found to inhibit vascular endothelial growth factor (VEGF)- or basic fibroblast growth factor (bFGF)-dependent proliferation (IC50=0.052 micromol/l) of human umbilical vein endothelial cells (HUVECs) 20- to 100-fold selectively in comparison with normal fibroblast (3Y1) or several tumor cells (KB3-1, K562 and Neuro2A). Bastadin 6 also inhibited VEGF- or bFGF-induced tubular formation (0.1 micromol/l, 6 h treatment) and VEGF-induced migration (1 micromol/l, 4 h treatment) of HUVECs. Moreover, bastadin 6 almost completely blocked VEGF- or bFGF-induced in vivo neovascularization in the mice corneal assay and suppressed growth of s.c. inoculated A431 solid tumor in nude mice (100 mg/kg, i.p.). Bastadin 6 induced cell death of HUVECs with an apoptotic phenotype, whereas it showed no effect on the VEGF-induced auto-phosphorylation of VEGF receptors Flt-1 and KDR/Flk-1. These results suggest that the anti-angiogenic effect of bastadin 6 is closely related to selective induction activity of apoptosis against endothelial cells.
authors.affiliation: Graduate School of Pharmaceutical Sciences, Osaka University, Osaka, Japan.
authors.forename: Shunji
authors.initials: S
authors.lastname: Aoki
authors.forename: Seok-hwan
authors.initials: SH
authors.lastname: Cho
authors.forename: Mayumi
authors.initials: M
authors.lastname: Ono
authors.forename: Takashi
authors.initials: T
authors.lastname: Kuwano
authors.forename: Shintaro
authors.initials: S
authors.lastname: Nakao
authors.forename: Michihiko
authors.initials: M
authors.lastname: Kuwano
authors.forename: Shinsaku
authors.initials: S
authors.lastname: Nakagawa
authors.forename: Jian-Qing
authors.initials: JQ
authors.lastname: Gao
authors.forename: Tadanori
authors.initials: T
authors.lastname: Mayumi
authors.forename: Masabumi
authors.initials: M
authors.lastname: Shibuya
authors.forename: Motomasa
authors.initials: M
authors.lastname: Kobayashi
mesh_terms: D020533:Angiogenesis Inhibitors / Q000494:pharmacology*; D000818:Animals; D017209:Apoptosis / Q000187:drug effects*; D002294:Carcinoma, Squamous Cell / Q000098:blood supply* / Q000188:drug therapy*; D048708:Cell Growth Processes / Q000187:drug effects; D003315:Cornea / Q000098:blood supply; D042783:Endothelial Cells / Q000166:cytology / Q000187:drug effects*; D016222:Fibroblast Growth Factor 2 / Q000037:antagonists & inhibitors / Q000494:pharmacology; D055768:Halogenated Diphenyl Ethers; D006801:Humans; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D041681:NIH 3T3 Cells; D009389:Neovascularization, Pathologic / Q000188:drug therapy / Q000473:pathology; D018919:Neovascularization, Physiologic / Q000187:drug effects; D011161:Porifera / Q000737:chemistry; D051381:Rats; D014443:Tyrosine / Q000031:analogs & derivatives* / Q000494:pharmacology; D042461:Vascular Endothelial Growth Factor A / Q000037:antagonists & inhibitors / Q000097:blood / Q000494:pharmacology; D040281:Vascular Endothelial Growth Factor Receptor-1 / Q000378:metabolism; D040301:Vascular Endothelial Growth Factor Receptor-2 / Q000378:metabolism; D023041:Xenograft Model Antitumor Assays
chemical_list: D020533:Angiogenesis Inhibitors; D055768:Halogenated Diphenyl Ethers; D042461:Vascular Endothelial Growth Factor A; C515158:bastadin 6; D016222:Fibroblast Growth Factor 2; D014443:Tyrosine; D040281:Vascular Endothelial Growth Factor Receptor-1; D040301:Vascular Endothelial Growth Factor Receptor-2