Peptide–drug conjugates are delivery systems for selective delivery of cytotoxic agents to target cancer cells. In this work, the optimized synthesis of JH-VII-139-1 and its c(RGDyK) peptide conjugates is presented. The low nanomolar SRPK1 inhibitor, JH-VII-139-1, which is an analogue of Alectinib, was linked to the ανβ3 targeting oligopeptide c(RGDyK) through amide, carbamate and urea linkers. The chemostability, cytotoxic and antiangiogenic properties of the synthesized hybrids were thoroughly studied. All conjugates retained mid nanomolar-level inhibitory activity against SRPK1 kinase and two out of four conjugates, geo75 and geo77 exhibited antiproliferative effects with low micromolar IC50 values against HeLa, K562, MDA-MB231 and MCF7 cancer cells. The activities were strongly related to the stability of the linkers and the release of JH-VII-139-1. In vivo zebrafish screening assays demonstrated the ability of the synthesized conjugates to inhibit the length or width of intersegmental vessels (ISVs). Flow cytometry experiments were used to test the cellular uptake of a fluorescein tagged hybrid in MCF7 and MDA-MB231 cells that revealed a receptor-mediated endocytosis process. In conclusion, most conjugates retained the inhibitory potency against SRPK1 as JH-VII-139-1 and demonstrated antiproliferative and antiangiogenic activities. Further animal model experiments are needed to uncover the full potential of such peptide conjugates in cancer therapy and angiogenesis-related diseases.
肽-药物共轭物是选择性地向靶向癌细胞输送细胞毒性药物的输送系统。本文介绍了 JH-VII-139-1 及其 c(RGDyK)多肽共轭物的优化合成。低纳摩尔 SRPK1 抑制剂 JH-VII-139-1 是 Alectinib 的类似物,通过酰胺、氨基甲酸酯和脲连接体与 ανβ3 靶向寡肽 c(RGDyK) 连接。对合成的混合物的化学稳定性、细胞毒性和抗血管生成特性进行了深入研究。所有共轭物都对 SRPK1 激酶具有中等纳摩尔水平的抑制活性,四种共轭物中有两种(geo75 和 geo77)对 HeLa、K562、MDA-MB231 和 MCF7 癌细胞具有低微摩尔 IC50 值的抗增殖作用。这些活性与连接体的稳定性和 JH-VII-139-1 的释放密切相关。体内斑马鱼筛选实验表明,合成的共轭物能够抑制节间血管(ISV)的长度或宽度。流式细胞术实验测试了荧光素标记的混合体在 MCF7 和 MDA-MB231 细胞中的细胞摄取情况,结果显示了受体介导的内吞过程。总之,大多数共轭物都与 JH-VII-139-1 一样保持了对 SRPK1 的抑制效力,并表现出抗增殖和抗血管生成活性。要充分挖掘此类多肽共轭物在癌症治疗和血管生成相关疾病中的潜力,还需要进一步的动物模型实验。