an effort to improve the stability of homocamptothecin and reduce the toxicity, novel homocamptothecin analogs with acylamino groups at C(9) were designed and synthesized. The cytotoxic activities of all the synthetic compounds against three cancer cell lines were evaluated by the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-2H-tetrazolium bromide (MTT) assay, and irinotecan was used as reference compound
为了提高高
喜树碱的稳定性并降低毒性,设计并合成了在C(9)具有酰基
氨基的新高
喜树碱类似物。通过3-(
4,5-二甲基噻唑-2-基)-2,5
-二苯基-2H-
溴化
四唑(M
TT)分析评估所有合成化合物对三种癌细胞的细胞毒活性,并使用
伊立替康作为参考化合物。在C(9)处带有
哌啶基乙酰酰胺基的化合物7c和带有苯基乙酰酰胺基的化合物10a在体外和体内均显示出强大的活性。此外,他们还发现了显着的拓扑异构酶I抑制作用,这种抑制作用与活性口袋中与
氨基酸残基Arg364和Asp533的牢固结合形成。根据
生物活性,7c和10a将是进一步研究的潜在候选者。