Triggering apoptosis by oroxylin A through caspase-8 activation and p62/SQSTM1 proteolysis

Triggering apoptosis by oroxylin A through caspase-8 activation and p62/SQSTM1 proteolysis
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Oroxylin A 通过 caspase-8 激活和 p62/SQSTM1 蛋白水解触发细胞凋亡

DOI:
10.1016/j.redox.2019.101392
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发表时间:
2019-11
期刊:
影响因子:
11.4
通讯作者:
Lu Na
Lu Na
中科院分区:
生物学1区
文献类型:
--
作者:
Zhao Yue;Zhu Qin;Bu Xiumin;Zhou Yihui;Bai Dongsheng;Guo Qinglong;Gao Yuan;Lu Na

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新的证据表明 Oroxylin A 通过诱导细胞凋亡表现出抗肿瘤作用。然而,所涉及的分子机制尚未阐明。在这里,我们报道了 oroxylin A 诱导的细胞凋亡依赖于 p62 介导的肝细胞癌细胞中 caspase-8 的激活。此外,oroxylin A 还通过激活 caspase-8 引起 p62/SQSTM1 Asp329 蛋白水解。进一步的研究证实,p62 突变(D329H 和 D329G)能够抵抗 oroxylin A 介导的 p62 裂解和细胞凋亡。由于缺少与 Keap1 相互作用的 KIR 结构域,裂解的 p62 降低了 Nrf2 的稳定性,从而引起氧化应激并增加 ROS 水平。在体内,p62 同样有助于 oroxylin A 在接种 SMMC-7721 肿瘤的异种移植模型中发挥抗肿瘤作用。总之,我们的研究结果表明,oroxylin A 通过 caspase-8 激活和 p62/SQSTM1 蛋白水解触发细胞凋亡。
Emerging evidence suggests that oroxylin A exhibits antitumor effects by inducing cell apoptosis. However, the involved molecular mechanisms have not been elucidated. Here we report that the apoptosis induced by oroxylin A was dependent on p62-mediated activation of caspase-8 in hepatocellular carcinoma cells. Furthermore, oroxylin A also caused p62/SQSTM1 proteolysis at Asp329 by activating caspase-8. Further studies confirm that mutation in p62 (D329H and D329G) was resistant to oroxylin A-mediated p62 cleavage and apoptosis. Due to the absence of the KIR domain that interacts with Keap1, the cleaved p62 reduced the stability of Nrf2, thereby causing oxidative stress and increasing ROS levels.In vivo, p62 similarly contributed to oroxylin A-exerted antitumor effect in xenograft model inoculated SMMC-7721 tumor. In conclusion, our findings indicated that oroxylin A triggered apoptosis through caspase-8 activation and p62/SQSTM1 proteolysis.
p62-Keap1-NRF2 通路的激活可防止肝细胞癌细胞中的铁死亡。
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