[Effect of YM155 on Apoptosis and Autophagy of K562 Cells].

OBJECTIVE: This study was purposed to investigate the effect of YM155, a survivin inhibitor, on the apoptosis and autophagy of K562 cells. METHODS: K562 cells were treated with YM155 at different concentration. Cell survival was analyzed by CCK-8 assay, the cell apoptosis was detected by flow cytometry. Survivin, BCL-2 and beclin1 mRNA expressions were determined by RT-PCR. Survivin, BCL-2, caspase-3, PARP and LC-3 protein expressions were assayed by Western blot. RESULTS: YM155 inhibited the proliferation of K562 cells in a time- and dose-dependent manners. With the increasing of YM155 concentration and prolonging of action time, the expression levels of mRNA and protein of survivin and BCL-2 decreased, while the expression levels of caspase-3, PARP, beclin1 and LC-3 increased. Compared with the YM155 group, the protein levels of LC-3 and caspase-3 were lower in YM155 combined with 3-MA group. CONCLUSION: YM155 can inhibit K562 cell proliferation by inducing apoptosis and autophagy, while autophagy induction effect can enhance its cytotoxic effect.