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SZC015对肺癌细胞的体外抗癌作用通过活性氧依赖性凋亡和自噬诱导机制实现。

Anticancer effect of SZC015 on lung cancer cells through ROS-dependent apoptosis and autophagy induction mechanisms in vitro.

作者信息

Sun Bin, Gao Lei, Ahsan Anil, Chu Peng, Song Yanlin, Li Hailong, Zhang Zonghui, Lin Yuan, Peng Jinyong, Song Zhicheng, Wang Shisheng, Tang Zeyao

机构信息

Pharmacology Department, Dalian Medical University, 9 West Section, South Road of Lvshun, Dalian, China.

College of Pharmaceutical Science and Technology, Dalian University of Technology, Dalian, China.

出版信息

Int Immunopharmacol. 2016 Nov;40:400-409. doi: 10.1016/j.intimp.2016.09.026. Epub 2016 Sep 30.

Abstract

Oleanolic acid (OA) and its several derivatives possess various pharmacological activities, such as antitumor and anti-inflammation. In present study, anticancer effect of SZC015, an OA derivative, and its underlying mechanisms were investigated. We demonstrated that cell viability was significantly decreased in SZC015-treated lung cancer cells, but has less cytotoxicity in human bronchial epithelial cell line. Further investigation verified that apoptosis and autophagy induction and G/G phase arrest were observed in SZC015-treated H322 cells. Mechanically, the level of Akt, p-Akt, p-IκBα, and total p65, the p-p65 in the cytoplasm and nucleus were suppressed by SZC015 in H322 cells, respectively. Inhibition of p65 nuclear translocation was also confirmed by immunofluorescence staining. In addition, co-treatment with chloroquine, an autophagy inhibitor, significantly inhibited SZC015-induced autophagy and enhanced SZC015-induced apoptotic cell death. Intracellular ROS was increased in a concentration-dependent manner, which could be prevented by N-Acetyl l-Cysteine, an ROS scavenger. Moreover, the level of Akt and procaspase-3 were increased, while the ratio of LC3 II/I was decreased. Taken together, our study demonstrates that the inhibitory effect of SZC015 against H322 cells is mediated by excessive ROS generation that could suppress Akt/NF-κB signaling pathway, which thereby leads to apoptotic and autophagic cell death.

摘要

齐墩果酸(OA)及其多种衍生物具有多种药理活性,如抗肿瘤和抗炎作用。在本研究中,我们研究了OA衍生物SZC015的抗癌作用及其潜在机制。我们发现,SZC015处理的肺癌细胞的细胞活力显著降低,但对人支气管上皮细胞系的细胞毒性较小。进一步研究证实,SZC015处理的H322细胞中观察到凋亡和自噬诱导以及G/G期阻滞。机制上,SZC015分别抑制了H322细胞中Akt、p-Akt、p-IκBα和总p65的水平,以及细胞质和细胞核中的p-p65。免疫荧光染色也证实了p65核转位的抑制。此外,自噬抑制剂氯喹的联合处理显著抑制了SZC015诱导的自噬,并增强了SZC015诱导的凋亡细胞死亡。细胞内ROS以浓度依赖性方式增加,而ROS清除剂N-乙酰半胱氨酸可以预防这种增加。此外,Akt和procaspase-3的水平升高,而LC3 II/I的比例降低。综上所述,我们的研究表明,SZC015对H322细胞的抑制作用是由过量ROS生成介导的,ROS可抑制Akt/NF-κB信号通路,从而导致凋亡和自噬性细胞死亡。

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