Ursolic acid (UA) as the leader compound was designed to prepare a series of derivatives (three novel compounds UA-1a, UA-1b and UA-2) by modification at the C3 and C28 positions. Their chemical structures were confirmed by IR, H-1 NMR and MS. The cytotoxic activity of the derivatives was evaluated against HepG2, BGC-823 and HT-29 by the MTT assay. The novel derivative UA-1a, [3 beta-acetoxy-urs-12-en-28-oyl]-1-monoglyceride showed significant anti-growth ability against the assayed cancer cell lines, particularly against BGC-823, while low cytotoxicity to human normal gastric cell line GES-1. Further investigation revealed that UA-1a could induce apoptotic events of the treated BGC-823 cells, such as comet-like DNA bend, sub-G0/G1 phase accumulation and phosphatidylserine externalization. The activity of Caspase-3 was found to be up-regulated, while the expression of Bcl-2 and Survivin were down-regulated in UA-1a treated cells. UA-1a might trigger the death of BGC-823 cells by inducing apoptosis via the mitochondria pathway. UA-1a exerted stronger ability than Taxol to retard tumor growth in nude mice without leaving apparent toxicity to the hosts. The experimental data suggested that UA-1a would have a therapeutic potential in the treatment of gastric cancer. (C) 2011 Elsevier Ltd. All rights reserved.
and evaluated for their antiproliferative activity against the Hela and MKN45 cell lines. Some compounds containing a piperazine moiety displayed moderate to high levels of antitumor activities against the tested cancer cell lines. The most potent compound shares the IC50 value of 2.1 µM and 2.6 µM for the Hela and MKN45 cell lines, respectively. Further mechanism studies and in vivo antitumor studies
设计、合成了 19 种熊果酸类似物,并评估了它们对 Hela 和 MKN45 细胞系的抗增殖活性。一些含有哌嗪部分的化合物对所测试的癌细胞系显示出中等至高水平的抗肿瘤活性。对于 Hela 和 MKN45 细胞系,最有效的化合物的 IC50 值分别为 2.1 µM 和 2.6 µM。进一步的机制研究和体内抗肿瘤研究表明,它降低了细胞凋亡调节因子 (BCL2/BAX) 的比例,破坏了线粒体电位并诱导了细胞凋亡,并抑制了 Hela 异种移植物在裸鼠体内的生长。