作者:Fiona M. Deane、Elaine C. O'Sullivan、Anita R. Maguire、Jayne Gilbert、Jennette A. Sakoff、Adam McCluskey、Florence O. McCarthy
DOI:10.1039/c2ob27186a
日期:——
Drugs that inhibit DNA topoisomerase I and DNA topoisomerase II have been widely used in cancer chemotherapy. We report herein the results of a focused medicinal chemistry effort around novel ellipticinium salts which target topoisomerase I and II enzymes with improved solubility. The salts were prepared by reaction of ellipticine with the required alkyl halide and evaluated for DNA intercalation, topoisomerase inhibition and growth inhibition against 12 cancer cell lines. Results from the topoisomerase I relaxation assay indicated that all novel ellipticine derivatives behaved as intercalating agents. At a concentration of 100 μM, specific topoisomerase I inhibition was not observed. Two of the derivatives under investigation were found to fully inhibit the DNA decatenation reaction at a concentration of 100 μM, indicative of topoisomerase II inhibition. N-Alkylation of ellipticine was found to enhance the observed growth inhibition across all cell lines and induce growth inhibition comparable to that of Irinotecan (CPT-11; GI50 1–18 μM) and in some cell lines better than Etoposide (VP-16; GI50 = 0.04–5.2 μM). 6-Methylellipticine was the most potent growth inhibitory compound assessed (GI50 = 0.47–0.9 μM). N-Alkylation of 6-methylellipticine was found to reduce this response with GI50 values in the range of 1.3–28 μM.
抑制 DNA 拓扑异构酶 I 和 II 的药物在癌症化疗中得到了广泛应用。我们在此报告了一项针对新型椭圆土盐的集中药物化学研究结果,这些盐类针对拓扑异构酶 I 和 II 具有改进的溶解度。这些盐是通过椭圆土与所需的烷基卤化物反应制备的,并进行了 DNA 嵌入、拓扑异构酶抑制和对 12 种癌细胞系的生长抑制评估。拓扑异构酶 I 松弛检测的结果表明,所有新型椭圆土衍生物都表现为嵌入剂。在 100 μM 的浓度下,未观察到特异性拓扑异构酶 I 的抑制。研究中发现,两个衍生物能在 100 μM 的浓度下完全抑制 DNA 解缠反应,表明其对拓扑异构酶 II 的抑制作用。椭圆土的 N-烷基化被发现能够增强所有细胞系的生长抑制效果,并诱导出与伊立替康(CPT-11;GI50 1–18 μM)相当的生长抑制,在某些细胞系中优于依托泊苷(VP-16;GI50 = 0.04–5.2 μM)。6-甲基椭圆土是评估的最有效的生长抑制化合物(GI50 = 0.47–0.9 μM)。对 6-甲基椭圆土的 N-烷基化导致其生长抑制反应降低,GI50 值在 1.3–28 μM 范围内。