DDB2 increases radioresistance of NSCLC cells by enhancing DNA damage responses.

DDB2 increases radioresistance of NSCLC cells by enhancing DNA damage responses.
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DOI:
10.1007/s13277-016-5203-y
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发表时间:
2016-10
期刊:
Tumour biology : the journal of the International Society for Oncodevelopmental Biology and Medicine
影响因子:
--
通讯作者:
Wang QE
Wang QE
中科院分区:
其他
文献类型:
--
作者:
Zou N;Xie G;Cui T;Srivastava AK;Qu M;Yang L;Wei S;Zheng Y;Wang QE

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放疗抵抗是限制肺癌患者放疗疗效的主要因素之一。广泛的研究表明辐射抗性机制的多样性。在这里,我们发现 DNA 损伤结合蛋白 2 (DDB2) 是非小细胞肺癌 (NSCLC) 细胞放射敏感性的潜在调节剂。 DDB2 最初被确定为核苷酸切除修复中的 DNA 损伤识别因子,在电离辐射 (IR) 下促进 NSCLC 细胞系的存活并抑制其凋亡。机制研究表明,DDB2 能够促进 IR 诱导的 Chk1 磷酸化,这在响应 IR 诱导的 DNA 双链断裂 (DSB) 的细胞周期停滞和 DNA 修复中发挥着关键作用。事实上,DDB2 的敲低会损害 p53 丰富的 A549 细胞系中的 G2 停滞,并降低同源重组 (HR) 修复的效率。综上所述,我们的数据表明 NSCLC 中 DDB2 的表达可以作为预测患者放射敏感性的生物标志物。靶向 Chk1 可用于提高 DDB2 水平高的 NSCLC 患者的放疗疗效。
Radiotherapy resistance is one of the major factors limiting the efficacy of radiotherapy in lung cancer patients. The extensive investigations indicate the diversity in the mechanisms underlying radioresistance. Here, we revealed that DNA damage binding protein 2 (DDB2) is a potential regulator in the radiosensitivity of non-small cell lung cancer (NSCLC) cells. DDB2, originally identified as a DNA damage recognition factor in the nucleotide excision repair, promotes the survival and inhibits the apoptosis of NSCLC cell lines upon ionizing radiation (IR). Mechanistic investigations demonstrated that DDB2 is able to facilitate IR-induced phosphorylation of Chk1, which plays a critical role in the cell cycle arrest and DNA repair in response to IR-induced DNA double-strand breaks (DSBs). Indeed, knockdown of DDB2 compromised the G2 arrest in the p53-proficient A549 cell line and reduced the efficiency of homologous recombination (HR) repair. Taken together, our data indicate that the expression of DDB2 in NSCLC could be used as a biomarker to predict radiosensitivity of the patients. Targeting Chk1 can be used to increase the efficacy of radiotherapy in patients of NSCLC possessing high levels of DDB2.
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