Synthesis and biological evaluation of benzo[a]phenazine derivatives as a dual inhibitor of topoisomerase I and II
作者:Shi-Tian Zhuo、Chun-Yan Li、Ming-Hao Hu、Shuo-Bin Chen、Pei-Fen Yao、Shi-Liang Huang、Tian-Miao Ou、Jia-Heng Tan、Lin-Kun An、Ding Li、Lian-Quan Gu、Zhi-Shu Huang
DOI:10.1039/c3ob40325d
日期:——
Topoisomerases (Topo I and Topo II) are very important players in DNA replication, repair, and transcription, and are a promising class of antitumor target. In present study, a series of benzo[a]phenazine derivatives with alkylamino side chains at C-5 were designed, synthesized, and their biological activities were evaluated. Most of derivatives showed good antiproliferative activity with a range of IC50 values of 1–10 μM on the four cancer cell lines HeLa, A549, MCF-7, and HL-60. Topoisomerase-mediated DNA relaxation assay results showed that derivatives could effectively inhibit the activity of both Topo I and Topo II, and the structure–activity relationship studies indicated the importance of introducing an alkylamino side chain. Further mechanism studies revealed that the compounds could stabilize the Topo I–DNA cleavage complexes and inhibit the ATPase activity of hTopo II, indicating that they are a rare class of dual topoisomerase inhibitors by acting as Topo I poisons and Topo II catalytic inhibitors. Moreover, flow cytometric analysis and caspase-3/7 activation assay showed that this class of compounds could induce apoptosis of HL-60 cells.
拓扑异构酶(Topo I 和 Topo II)在DNA复制、修复和转录中扮演着非常重要的角色,是一种有前景的抗肿瘤靶点。本文研究设计并合成了一系列在C-5位具有烷基氨基侧链的苯并[a]菲嗪衍生物,并评估了它们的生物活性。大多数衍生物在四种癌细胞系HeLa、A549、MCF-7和HL-60上表现出良好的抗增殖活性,IC50值范围为1-10 μM。拓扑异构酶介导的DNA松弛实验结果表明,这些衍生物能够有效抑制Topo I和Topo II的活性,结构—活性关系研究显示引入烷基氨基侧链的重要性。进一步的机制研究揭示,这些化合物能够稳定Topo I—DNA切割复合物,并抑制人Topo II的ATP酶活性,表明它们是一类稀有的双重拓扑异构酶抑制剂,既可以作为Topo I毒剂又能抑制Topo II的催化活性。此外,流式细胞术分析和半胱天冬酶-3/7激活实验显示,这类化合物能够诱导HL-60细胞凋亡。