Topoisomerases (topo-I and topo-II) have occupied a significant role in DNA replication, transcription, and are a promising set of antitumor targets. In the present approach, a series of new 4β-amidotriazole linked podophyllotoxin derivatives (10a-i and 11a-k) were designed, synthesized by employing the click chemistry and their biological activities were evaluated. The majority of derivatives showed promising antiproliferative activity with IC₅₀ values ranging from 1 to 10 μM on the six human cancer cell lines; cervical (HeLa), breast (MCF-7), prostate (DU-145), lung (A549), liver (HepG2) and colon (HT-29). Among them, some of the congeners 10b, 10g and 10i have shown remarkable cytotoxicity with IC₅₀ values of, < 1 μM against the tested cancer cell lines and found to be more active than etoposide. Topoisomerase-mediated DNA relaxation assay results showed that the derivatives could efficiently inhibit the activity of topoisomerase-II. In addition, flow cytometry analysis on DU-145 cells revealed that these compounds arrest G2/M phase of cell cycle. Further apoptotic studies were also performed on these DU-145 cells, which showed that this class of compounds could induce apoptosis effectively.

拓扑异构酶（topo-I和topo-II）在DNA复制，转录中起着重要作用，并且是一组有希望的抗肿瘤靶标。在本方法中，一系列新的4个β -amidotriazole联鬼臼毒素衍生物（10A-I和图11A-K ）被设计，通过采用点击化学和它们的生物活性进行了评价合成。大多数衍生物在六种人类癌细胞系上显示出令人鼓舞的抗增殖活性，IC ₅₀值范围为1至10μM。宫颈（HeLa），乳腺（MCF-7），前列腺（DU-145），肺（A549），肝（HepG2）和结肠（HT-29）。其中一些同类物10b，10g和10i已显示出显着的细胞毒性，对测试的癌细胞系的IC ₅₀值<1μM，并且比依托泊苷具有更高的活性。拓扑异构酶介导的DNA弛豫试验结果表明，该衍生物能有效抑制拓扑异构酶II的活性。此外，对DU-145细胞的流式细胞仪分析表明，这些化合物可阻止细胞周期的G2 / M期。还对这些DU-145细胞进行了凋亡研究，结果表明这类化合物可以有效诱导细胞凋亡。