UBE2O targets Mxi1 for ubiquitination and degradation to promote lung cancer progression and radioresistance.

UBE2O targets Mxi1 for ubiquitination and degradation to promote lung cancer progression and radioresistance.
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UBE2O靶向Mxi1泛素化和降解以促进肺癌进展和放射抗性

DOI:
10.1038/s41418-020-00616-8
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发表时间:
2021-03
影响因子:
12.4
通讯作者:
Wu G
Wu G
中科院分区:
生物学1区
文献类型:
--
作者:
Huang Y;Yang X;Lu Y;Zhao Y;Meng R;Zhang S;Dong X;Xu S;Wu G

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UBE2O是一种E2/E3杂合泛素 - 蛋白连接酶,已涉及脂肪生成、红细胞分化和肿瘤增殖的调控。然而,其在癌症放射抗性中的作用仍然完全未知。在此,我们发现UBE2O与Mxi1相互作用,并在K46残基处靶向Mxi1进行泛素化和降解。此外,我们表明,对UBE2O进行基因或药物阻断会在体外和体内损害肺癌的肿瘤进展和放射抗性,并且这些效应可通过抑制Mxi1得以恢复。而且,我们证明UBE2O在肺癌组织中过表达,并且与Mxi1蛋白水平呈负相关。总之,我们的工作揭示UBE2O通过促进Mxi1泛素化和降解来促进肿瘤发生和放射抗性,这表明UBE2O是肺癌治疗中一个有吸引力的放射增敏靶点。
UBE2O, an E2/E3 hybrid ubiquitin-protein ligase, has been implicated in the regulation of adipogenesis, erythroid differentiation, and tumor proliferation. However, its role in cancer radioresistance remains completely unknown. Here, we uncover that UBE2O interacts and targets Mxi1 for ubiquitination and degradation at the K46 residue. Furthermore, we show that genetical or pharmacological blockade of UBE2O impairs tumor progression and radioresistance in lung cancer in vitro and in vivo, and these effects can be restored by Mxi1 inhibition. Moreover, we demonstrate that UBE2O is overexpressed and negatively correlated with Mxi1 protein levels in lung cancer tissues. Collectively, our work reveals that UBE2O facilitates tumorigenesis and radioresistance by promoting Mxi1 ubiquitination and degradation, suggesting that UBE2O is an attractive radiosensitization target for the treatment of lung cancer.
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