Biomedical Research Center Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Republic of Korea.
Cell Cycle. 2013 Jan 1;12(1):67-75. doi: 10.4161/cc.22962.
Aurora A kinase has drawn considerable attention as a therapeutic target for cancer therapy. However, the underlying molecular and cellular mechanisms of the anticancer effects of Aurora A kinase inhibition are still not fully understood. Herein, we show that depletion of Aurora A kinase by RNA interference (RNAi) in hepatocellular carcinoma (HCC) cells upregulated FoxO1 in a p53-dependent manner, which induces cell cycle arrest. Introduction of an RNAi-resistant Aurora A kinase into Aurora A-knockdown cells resulted in downregulation of FoxO1 expression and rescued proliferation. In addition, silencing of FoxO1 in Aurora A-knockdown cells allowed the cells to exit cytostatic arrest, which, in turn, led to massive cell death. Our results suggest that FoxO1 is responsible for growth arrest at the G2/M phase that is induced by Aurora A kinase inhibition.
极光激酶 A 作为癌症治疗的一个治疗靶点引起了相当大的关注。然而,极光激酶 A 抑制的抗癌作用的潜在分子和细胞机制仍不完全清楚。在此,我们表明 RNA 干扰 (RNAi) 敲低肝癌 (HCC) 细胞中的极光激酶 A 以依赖 p53 的方式上调 FoxO1,从而诱导细胞周期停滞。将 RNAi 抗性极光激酶 A 导入极光激酶 A 敲低细胞中会导致 FoxO1 表达下调并挽救增殖。此外,在极光激酶 A 敲低细胞中沉默 FoxO1 允许细胞退出细胞静止性抑制,这反过来又导致大量细胞死亡。我们的结果表明,FoxO1 负责由极光激酶 A 抑制诱导的 G2/M 期的生长停滞。