B5, a novel pyrrole-substituted indolinone, exerts potent antitumor efficacy through G2/M cell cycle arrest
作者:Xishan Xiong、Yingwei Zhang、Xiang Gao、Zheyi Dong、Lin Li、Chengcheng Ji、Lili Fu、Xiaomin Luo、Hong Liu、Changlin Mei
DOI:10.1007/s10637-008-9211-7
日期:2010.2
(E)-Ethyl 3,5-dimethyl-4-[(indolin-2-one-3-ylidene)methyl]-1H-pyrrole-2-carboxylate (B5) was one of the novel pyrrole-substituted indolinones synthesized in our research with the initial aim of developing selective epidermal growth factor receptor (EGFR) tyrosine kinase inhibitor (TKIs). However, B5 exhibited weak inhibitory potency against a variety of protein tyrosine kinases including EGFR, but potent kinase inhibition against several members of the cyclin-dependent kinase (CDK) family. The results of 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay demonstrated that B5 had approximately 500 times more potent antitumor activity than PD153035, a known standard EGFR-TKI, in a panel of ten epithelial cancer cell lines. B5 did not inhibit the phosphorylation of EGFR induced by EGF in vitro. DNA flow cytometric analysis revealed that B5 induced cell cycle arrest at G2/M phase and western blot analysis indicated that both CDK1 (Cdc2) and cyclin B1 proteins were decreased after B5 treatment. Our findings suggested the potential therapeutic applications of B5 in numerous cancers and a promising new template for further development of antitumor agents.
(E)-3,5-二甲基-4-[(吲哚啉-2-酮-3-亚基)甲基]-1H-吡咯-2-羧酸乙酯(B5)是我们研究中合成的新型吡咯取代吲哚啉酮之一,最初的目的是开发选择性表皮生长因子受体(EGFR)酪氨酸激酶抑制剂(TKIs)。然而,B5 对包括表皮生长因子受体在内的多种蛋白酪氨酸激酶的抑制作用较弱,但对细胞周期蛋白依赖性激酶(CDK)家族的几种成员具有强效的激酶抑制作用。3-(4,5-二甲基噻唑-2-基)-2,5-二苯基溴化四氮唑(MTT)测定结果表明,在十种上皮癌细胞系中,B5的抗肿瘤活性比已知的标准表皮生长因子受体激酶抑制剂PD153035强约500倍。B5 不抑制表皮生长因子受体在体外诱导的表皮生长因子受体磷酸化。DNA 流式细胞分析表明,B5 能诱导细胞周期停滞在 G2/M 期,Western 印迹分析表明,B5 处理后 CDK1(Cdc2)和细胞周期蛋白 B1 蛋白均减少。我们的研究结果表明,B5 有可能应用于多种癌症的治疗,并为进一步开发抗肿瘤药物提供了一个前景广阔的新模板。