标题：6r, a novel oxadiazole analogue of ethacrynic acid, exhibits antitumor activity both in vitro and in vivo by induction of cell apoptosis and S-phase arrest
作者：Zhang, Peng; Chen, Jin-Hua; Dong, Xue; Tang, Ming-Tan; Gao, Li-Yan; Zhao, Gui-Sen; Yu, Lu-Gang; Guo, Xiu-Li
作者机构：[Zhang, Peng; Chen, Jin-Hua; Dong, Xue; Tang, Ming-Tan; Gao, Li-Yan; Guo, Xiu-Li] Shandong Univ, Sch Pharmaceut Sci, Dept Pharmacol, Key Lab Chem Biol 更多
通讯作者地址：[Zhao, GS]Shandong Univ, Sch Pharmaceut Sci, Dept Med Chem, 44 WenHuaXi Rd, Jinan 250012, Peoples R China.
来源：BIOMEDICINE & PHARMACOTHERAPY
关键词：5-[2,3-Dichloro-4-(2-methylene-1-oxobutyl); phenoxymethyl]-3-methyl-1,2,4-oxadiazole (6r); Human cancer cell lines;; Glutathione S-transferase P1-1; Apoptosis; Cell cycle
摘要：This study investigated the in vitro and in vivo antitumor effects of 5-[2,3-Dichloro-4-(2-methylene-1-oxobutyl) phenoxymethyl]-3-methyl-1,2,4-oxadiazole (6r), a novel ethacrynic acid (EA) derivative. The in vitro effect of 6r on cell proliferation of human colon, leukemia, prostate, lung, breast, ovarian and cervical tumor cell lines was assessed using MTT assay and the in vivo effect was determined with an SW620 xenografts nude mice model. The effect of 6r on expressions of GST P1-1 and apoptosis-related proteins were measured by western blotting and the effect on cell apoptosis was analysed by Hoechst 33258 nuclear staining as well as by cell surface staining of annexin V/propidium iodide. The effect on cell cycle was assessed by flow cytometry. Results showed that 6r inhibit proliferation of a range of human cancer cells in vitro and growth of SW620 tumor xenografts in vivo. The anti-proliferative effect of 6r is associated with cell apoptosis as a result of increased ratio of cellular Bax/bcl-2 expression and subsequent cytochrome-c and caspase-3 activation. Unlike EA, 6r did not show any influence on cellular GST P1-1 expression and its anti-proliferative action was associated with cell cycle arrest in G1/S-phase. In conclusion, 6r has the potential to be developed as a chemotherapeutic agent by induction of cell apoptosis but not regulating GST P1-1. (C) 2012 Elsevier Masson SAS. All rights reserved.