Keap1 inhibition sensitizes head and neck squamous cell carcinoma cells to ionizing radiation via impaired non-homologous end joining and induced autophagy.

Keap1 inhibition sensitizes head and neck squamous cell carcinoma cells to ionizing radiation via impaired non-homologous end joining and induced autophagy.
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DOI:
10.1038/s41419-020-03100-w
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发表时间:
2020-10-21
影响因子:
9
通讯作者:
Cordes N
Cordes N
中科院分区:
生物学1区
文献类型:
--
作者:
Deville SS;Luft S;Kaufmann M;Cordes N

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Keap1(Kelch 样 ECH 相关蛋白 1)是一种氧化和亲电应激传感器,在癌细胞的放射敏感性中的功能仍然难以捉摸。在这里,我们研究了 ML344 药物抑制 Keap1 对头颈鳞状细胞癌 (HNSCC) 细胞系放射敏感性、DNA 双链断裂 (DSB) 修复和自噬的影响。我们的数据表明 Keap1 抑制可增强 HNSCC 细胞的放射敏感性。尽管非同源末端连接 (NHEJ) 相关 DNA 修复的 Nrf2 依赖性活性升高,但 Keap1 抑制似乎通过 DNA-PKcs 的延迟磷酸化损害 DSB 修复。此外,当与 X 射线照射相结合时,Keap1 抑制会引发自噬并增加 p62 水平。我们的研究结果表明,HNSCC 细胞放射敏感性、NHEJ 介导的 DSB 修复和自噬由 Keap1 共同调节。
The function of Keap1 (Kelch-like ECH-associated protein 1), a sensor of oxidative and electrophilic stress, in the radiosensitivity of cancer cells remains elusive. Here, we investigated the effects of pharmacological inhibition of Keap1 with ML344 on radiosensitivity, DNA double-strand break (DSB) repair and autophagy in head and neck squamous cell carcinoma (HNSCC) cell lines. Our data demonstrate that Keap1 inhibition enhances HNSCC cell radiosensitivity. Despite elevated, Nrf2-dependent activity of non-homologous end joining (NHEJ)-related DNA repair, Keap1 inhibition seems to impair DSB repair through delayed phosphorylation of DNA-PKcs. Moreover, Keap1 inhibition elicited autophagy and increased p62 levels when combined with X-ray irradiation. Our findings suggest HNSCC cell radiosensitivity, NHEJ-mediated DSB repair, and autophagy to be co-regulated by Keap1.
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