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Li, Juan; Liu, Jie; Liang, Zheyong; He, Fang; Yang, Lu; Li, Pingping; Jiang, Yina; Wang, Bo; Zhou, Can; Wang, Yaochun; Ren, Yu; Yang, Jin; Zhang, Jianmin; Luo, Zhijun; Vaziri, Cyrus; Liu, Peijun
Cell death & disease, 03/2017, Volume: 8, Issue: 3Journal Article
Loss or dysfunction of tumor suppressor retinoblastoma (RB) is a common feature in various tumors, and contributes to cancer cell stemness and drug resistance to cancer therapy. However, the strategy to suppress or eliminate Rb-deficient tumor cells remains unclear. In the present study, we accidentally found that reduction of DNA replication licensing factor MCM7 induced more apoptosis in RB-deficient tumor cells than in control tumor cells. Moreover, after a drug screening and further studies, we demonstrated that statin drug Simvastatin and Atorvastatin were able to inhibit MCM7 and RB expressions. Further study showed that Simvastatin and Atorvastatin induced more chromosome breaks and gaps of Rb-deficient tumor cells than control tumor cells. In vivo results showed that Simvastatin and Atorvastatin significantly suppressed Rb-deficient tumor growth than control in xenograft mouse models. The present work demonstrates that 'old' lipid-lowering drugs statins are novel weapons against RB-deficient tumors due to their effects on suppressing MCM7 protein levels.
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