Four novel betulinic acid (BA) derivatives modified at the C-3 position were prepared by the Mitsunobu reaction and subsequently evaluated for antitumor activity against four common cancer cell lines in vitro. The results from the MTT assay revealed that the four tested compounds showed remarkable cytotoxic activity against four cancer cell lines, much better than BA. Western blotting results indicated that the four compounds, especially compound 2c, caused a significant up-regulation expression of the caspase-12 in CT26 cell. Our results showed that configuration inversions of chiral C-3 of BA could also produce BA derivatives with potent antitumor activity.
通过Mitsunobu反应制备了四种在C-3位点修饰的新型
樟脑酸(BA)衍
生物,并随后在体外评估其对四种常见癌
细胞系的抗肿瘤活性。M
TT实验结果表明,四种测试化合物对四种癌
细胞系表现出显著的细胞毒性活性,远优于BA。免疫印迹实验结果显示,这四种化合物,特别是化合物2c,使CT26细胞中caspase-12的表达显著上调。我们的结果表明,
樟脑酸的手性C-3的构型倒置也可以产生具有强抗肿瘤活性的BA衍
生物。