Sun Bin, Gao Lei, Ahsan Anil, Chu Peng, Song Yanlin, Li Hailong, Zhang Zonghui, Lin Yuan, Peng Jinyong, Song Zhicheng, Wang Shisheng, Tang Zeyao
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.
Int Immunopharmacol. 2016 Nov;40:400-409. doi: 10.1016/j.intimp.2016.09.026. Epub 2016 Sep 30.
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.
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。