Toxicarioside O induces protective autophagy in a sirtuin-1-dependent manner in colorectal cancer cells.

Toxicarioside O induces protective autophagy in a sirtuin-1-dependent manner in colorectal cancer cells.
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Toxicarioside O 在结直肠癌细胞中以 Sirtuin-1 依赖性方式诱导保护性自噬

DOI:
10.18632/oncotarget.17189
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发表时间:
2017-08-08
期刊:
影响因子:
--
通讯作者:
Huang C
Huang C
中科院分区:
其他
文献类型:
--
作者:
Huang YH;Sun Y;Huang FY;Li YN;Wang CC;Mei WL;Dai HF;Tan GH;Huang C

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结直肠癌是最常见的癌症。它在世界范围内具有高发病率和死亡率,需要制定更有效的治疗策略。毒理苷O (Toxicarioside O, TCO)是一种从毒理草中提取的天然产物,已被证明是一种潜在的抗癌药物。然而,所涉及的分子机制仍然知之甚少。在本研究中,我们的研究结果表明,TCO可以诱导结直肠癌细胞凋亡和自噬。此外,tco诱导的自噬是由于sirtuin-1酶(SIRT1)表达和活性的增加,以及随后Akt/mTOR通路的抑制。SIRT1抑制剂EX-527抑制SIRT1活性可减弱tco诱导的自噬。有趣的是,自噬抑制剂氯喹抑制自噬可增强tco诱导的凋亡细胞死亡,提示自噬在tco诱导的凋亡中起保护作用。综上所述,TCO与自噬抑制剂联合使用可能是一种新的策略,适合于增强TCO治疗结直肠癌的抗癌活性。
Colorectal cancer is the most common cancer. It has high morbidity and mortality worldwide, and more effective treatment strategies need to be developed. Toxicarioside O (TCO), a natural product derived from Antiaris toxicaria, has been shown to be a potential anticancer agent. However, the molecular mechanisms involved remain poorly understood. In this study, our results demonstrated that TCO can induce both apoptosis and autophagy in colorectal cancer cells. Moreover, TCO-induced autophagy was due to the increase of the expression and activity of the enzyme sirtuin-1 (SIRT1), and subsequent inhibition of the Akt/mTOR pathway. Inhibition of SIRT1 activity by its inhibitor, EX-527, attenuated TCO-induced autophagy. Of interest, inhibition of autophagy by chloroguine, an autophagy inhibitor, enhanced TCO-induced apoptotic cell death, suggesting that autophagy plays a protective role in TCO-induced apoptosis. Together, these findings suggest that combination of TCO and autophagy inhibitor may be a novel strategy suitable for potentiating the anticancer activity of TCO for treatment of colorectal cancer.
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