色素性干皮病
顺铂
核苷酸切除修复
生物
癌症研究
转录因子
细胞凋亡
DNA修复
DNA损伤
药理学
缺氧(环境)
DNA
化学
生物化学
化疗
遗传学
基因
有机化学
氧气
作者
Yunyao Liu,Xiaosheng Wang,Wenshu Li,Yujiao Xu,Yating Zhuo,Mengyuan Li,Yuan He,Qinglong Guo,Li Zhao,Qiang Liu
出处
期刊:Oncogene
[Springer Nature]
日期:2020-09-25
卷期号:39 (45): 6893-6905
被引量:28
标识
DOI:10.1038/s41388-020-01474-x
摘要
Hypoxia is a key concern during the treatment of non-small cell lung cancer (NSCLC), and hypoxia-inducible factor 1 alpha (HIF-1α) has been associated with increased tumor resistance to therapeutic modalities such as cisplatin. Compensatory activation of nucleotide excision repair (NER) pathway is the major mechanism that accounts for cisplatin resistance. In the present study, we suggest a novel strategy to improve the treatment of NSCLC and overcome the hypoxia-induced cisplatin resistance by cotreatment with Oroxylin A, one of the main bioactive flavonoids of Scutellariae radix. Based on the preliminary screening, we found that xeroderma pigmentosum group C (XPC), an important DNA damage recognition protein involved in NER, dramatically increased in hypoxic condition and contributed to hypoxia-induced cisplatin resistance. Further data suggested that Oroxylin A significantly reversed the hypoxia-induced cisplatin resistance through directly binding to HIF-1α bHLH-PAS domain and blocking its binding to HRE3 transcription factor binding sites on XPC promoter which is important to hypoxia-induced XPC transcription. Taken together, our findings not only demonstrate a crucial role of XPC dependent NER in hypoxia-induced cisplatin resistance, but also suggest a previously unrecognized tumor suppressive mechanism of Oroxylin A in NSCLC which through sensitization of cisplatin-mediated growth inhibition and apoptosis under hypoxia.
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