Identification of DW532 as a novel anti-tumor agent targeting both kinases and tubulin
作者:Ting Peng、Jian-rui Wu、Lin-jiang Tong、Meng-yuan Li、Fang Chen、Yi-xin Leng、Rong Qu、Kun Han、Yi Su、Yi Chen、Wen-hu Duan、Hua Xie、Jian Ding
DOI:10.1038/aps.2014.33
日期:2014.7
7,8-Dihydroxy-4-(3-hydroxy-4-methoxyphenyl)-2H-chromen-2-one (DW532) is one of simplified analogues of hematoxylin that has shown broad-spectrum inhibition on tyrosine kinases and in vitro anti-cancer activities. The aim of this study was to identify DW532 as a agent targeting both kinases and tubulin, and to investigate its anti-cancer and anti-angiogenesis activities. In vitro tyrosine kinases activity was examined with ELISA, and tyrosine kinases activity in cells was evaluated with Western blot analysis. Tubulin turbidity assay, surface plasmon resonance and immunofluorescence technique were used to characterize the tubulin inhibitory activity. Cell proliferation was examined with SRB assay, and cell apoptosis and cell cycle distribution were analyzed with Annexin-V/PI staining and flow cytometry. Tube formation, aortic ring and chick chorioallantoic membrane assays were used to evaluate the anti-angiogenesis efficacy. DW532 inhibited EGFR and VEGFR2 in vitro kinase activity (the IC50 values were 4.9 and 5.5 μmol/L, respectively), and suppressed their downstream signaling. DW532 dose-dependently inhibited tubulin polymerization via direct binding to tubulin, thus disrupting the mitotic spindle assembly and leading to abnormal cell division. In a panel of human cancer cells, DW532 (1 and 10 μmol/L) induced G2/M phase arrest and cell apoptosis, which subsequently resulted in cytotoxicity. Knockdown of BubR1 or Mps1, the two core proteins of the spindle assembly checkpoint dramatically decreased DW532-induced cell cycle arrest in MDA-MB-468 cells. Moreover, treatment with DW532 potently and dose-dependently suppressed angiogenesis in vitro and in vivo. DW532 is a dual inhibitor against tubulin and tyrosine kinases, and deserves further development as a novel anti-cancer agent.
7,8-二羟基-4-(3-羟基-4-甲氧基苯基)-2H-色烯-2-酮(DW532)是一种简化的苏木精类似物,具有广谱抗酪氨酸激酶和体外抗癌活性。本研究旨在确定 DW532 是一种同时针对激酶和微管蛋白的药物,并研究其抗癌和抗血管生成活性。体外酪氨酸激酶活性用酶联免疫吸附试验检测,细胞内酪氨酸激酶活性用 Western 印迹分析评估。利用管蛋白浊度测定法、表面等离子体共振和免疫荧光技术来表征管蛋白的抑制活性。细胞增殖采用 SRB 检测法,细胞凋亡和细胞周期分布采用 Annexin-V/PI 染色法和流式细胞术进行分析。管形成、主动脉环和小鸡绒毛膜试验用于评估抗血管生成的功效。DW532抑制了表皮生长因子受体和血管内皮生长因子受体2的体外激酶活性(IC50值分别为4.9和5.5 μmol/L),并抑制了它们的下游信号转导。DW532 通过与微管蛋白直接结合,剂量依赖性地抑制微管蛋白聚合,从而破坏有丝分裂纺锤体的组装,导致细胞分裂异常。在一组人类癌细胞中,DW532(1 μmol/L 和 10 μmol/L )可诱导 G2/M 期停滞和细胞凋亡,从而产生细胞毒性。敲除纺锤体组装检查点的两个核心蛋白BubR1或Mps1可显著减少DW532诱导的MDA-MB-468细胞的细胞周期停滞。此外,DW532 还能有效抑制体外和体内的血管生成,且其抑制作用与剂量相关。DW532 是一种针对微管蛋白和酪氨酸激酶的双重抑制剂,值得作为一种新型抗癌药物进一步开发。