Data from SKLB1002, a Novel Potent Inhibitor of VEGF Receptor 2 Signaling, Inhibits Angiogenesis and Tumor Growth &lt;i&gt;In Vivo&lt;/i&gt;

Yalin Liu,Weiwei Li,Yuquan Wei,Hongxin Deng,Shengyong Liu,Shuang Zhang,Renlin Zheng,Guobo Shen,Shengyong Yang,Chengjian Zhao,Senyi Deng,Wei Wang,Zhixing Cao,Yang Yang,Na Zhang,Yunxiang Pan ,Hongtu Xie ,Songlin Feng ,Yan Ma ,Sheng‐Cai Shi ,Xiujian Zhao ,Liyun Dai ,Hao Tian ,Lin Chen

doi:10.1158/1078-0432.c.6518515.v1

Abstract

<div>AbstractPurpose: VEGF receptor 2 (VEGFR2) inhibitors, as efficient antiangiogenesis agents, have been applied in the cancer treatment. However, currently most of these anticancer drugs suffer some adverse effects. Discovery of novel VEGFR2 inhibitors as anticancer drug candidates is still needed.Experimental Design: In this investigation, we adopted a restricted de novo design method to design VEGFR2 inhibitors. We selected the most potent compound SKLB1002 and analyzed its inhibitory effects on human umbilical vein endothelial cells (HUVEC) in vitro. Tumor xenografts in zebrafish and athymic mice were used to examine the in vivo activity of SKLB1002.Results: The use of the restricted de novo design method indeed led to a new potent VEGFR2 inhibitor, SKLB1002, which could significantly inhibit HUVEC proliferation, migration, invasion, and tube formation. Western blot analysis was conducted, which indicated that SKLB1002 inhibited VEGF-induced phosphorylation of VEGFR2 kinase and the downstream protein kinases including extracellular signal-regulated kinase, focal adhesion kinase, and Src. In vivo zebrafish model experiments showed that SKLB1002 remarkably blocked the formation of intersegmental vessels in zebrafish embryos. It was further found to inhibit a new microvasculature in zebrafish embryos induced by inoculated tumor cells. Finally, compared with the solvent control, administration of 100 mg/kg/d SKLB1002 reached more than 60% inhibition against human tumor xenografts in athymic mice. The antiangiogenic effect was indicated by CD31 immunohistochemical staining and alginate-encapsulated tumor cell assay.Conclusions: Our findings suggest that SKLB1002 inhibits angiogenesis and may be a potential drug candidate in anticancer therapy. Clin Cancer Res; 17(13); 4439–50. ©2011 AACR.</div>

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