Peptides (H-Glu-Ile-Leu-Asp-Val-NH2, H-Glu-Ile-Leu-Asp-Val-Pro-Ser-Thr-NH2, H-Arg-Glu-Asp-Val-NH2) and their poly(ethylene glycol)(PEG) hybrids related to the core sequence of the type III connecting segment domain of fibronectin A chain were prepared by the solution method or the solid phase method. Their inhibitory effects on the adhesion and migration of B16-BL6 melanoma cells to fibronectin were assessed in vitro, and their therapeutic potency against tumor metastasis were also examined. Anti-adhesive and anti-migrative effects of the synthetic fibronectin-related peptids were superior to those of their PEG hybrids, so we found that the in vitro bioactivity of peptides decreased by PEGylation. In the in vivo assay, we found that the synthetic peptides containing Glu-Ile-Leu-Asp-Val and Arg-Glu-Asp-Val sequences exhibited an inhibitory effect on the experimental metastasis of B16-BL6 melanoma. Of the synthetic peptides, H-Glu-Ile-Leu-Asp-Val-NH2 exhibited the most potent inhibitory effect. Hybrid formation of Arg-Glu-Asp-Val with poly(ethylene glycol) resulted in potentiation of the inhibitory effect of the parent peptides. A mixture composed of PEG hybrids of Glu-Ile-Leu-Asp-Val, Arg-Glu-Asp-Val and Tyr-Ile-Gly-Ser-Arg dramatically inhibited tumor metastasis.
通过溶液法或固相法合成了包含纤连蛋白A链III型连接片段结构域核心序列的相关肽(H-Glu-Ile-Leu-Asp-Val-NH2、H-Glu-Ile-Leu-Asp-Val-Pro-Ser-Thr-NH2和H-Arg-Glu-Asp-Val-NH2)及其聚
乙二醇(P
EG)杂化物。在体外评估了它们对B16-BL6
黑色素瘤细胞黏附和迁移至纤连蛋白的抑制效果,并检验了它们对抗肿瘤转移的治疗效力。合成纤连蛋白相关肽的抗黏附和抗迁移效果优于其P
EG杂化物,因此我们发现,经P
EG化修饰后,肽在体外的
生物活性降低。在体内实验中,我们发现含有Glu-Ile-Leu-Asp-Val和Arg-Glu-Asp-Val序列的合成肽对B16-BL6
黑色素瘤的实验性转移具有抑制作用。在所有合成肽中,H-Glu-Ile-Leu-Asp-Val-NH2显示出最强的抑制效果。将Arg-Glu-Asp-Val与聚
乙二醇杂化后,增强了其母体肽的抑制效果。由Glu-Ile-Leu-Asp-Val、Arg-Glu-Asp-Val和Tyr-Ile-Gly-Ser-Arg的P
EG杂化物组成的混合物显著抑制了肿瘤转移。