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首页> 外文期刊>Cell cycle >ZEB1 inhibition sensitizes cells to the ATR inhibitor VE-821 by abrogating epithelial-mesenchymal transition and enhancing DNA damage
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ZEB1 inhibition sensitizes cells to the ATR inhibitor VE-821 by abrogating epithelial-mesenchymal transition and enhancing DNA damage

机译:Zeb1抑制通过消除上皮 - 间充质转变并增强DNA损伤,使细胞敏化细胞到ATR抑制剂VE-821

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摘要

The ataxia-telangiectasia-mutated (ATM) and rad3-related (ATR) checkpoint pathway plays an essential role in modulating cellular responses to replication stress and DNA damage to maintain genomic stability. In various tumors, cancer cells have increased dependence on ATR signaling for survival, making ATR a promising target for cancer therapy. ATR inhibitors sensitize multiple tumor cell types to radiation and DNA-damaging agents, but application of an ATR inhibitor alone shows limited efficacy. In the present study, we investigated the role of epithelial-to-mesenchymal transition (EMT) and the EMT transcription factor ZEB1 in regulating cell sensitivity to the ATR inhibitor VE-821. We found that VE-821 induced EMT with concomitant ZEB1 upregulation and promoted migration in cells in which the anti-proliferative effect of VE-821 was limited. Knocking down ZEB1 using siRNA partially reversed VE-821-induced EMT, and sensitized cells to VE-821 via effective attenuation of migration and AKT/ERK signaling. Moreover, ZEB1 inhibition promoted Chk1 phosphorylation and induced S-phase arrest by enhancing TopBP1 expression, which suggests a distinctive modulatory effect of ZEB1 on Chk1. Finally, combining VE-821 with ZEB1 inhibition enhanced DNA damage accumulation. These results demonstrate that EMT represents a novel mechanism for limiting the effectiveness of an ATR inhibitor, and thus suggest that ZEB1 inhibition might represent a new approach to increasing the efficiency of, or reversing resistance to, ATR inhibitors.
机译:共济失调 - 毛细血管扩张(ATM)和RAD3相关(ATR)检查点途径在调节复制应力和DNA损伤以保持基因组稳定性的情况下起着重要作用。在各种肿瘤中,癌细胞增加了对存活的ATR信号传导的依赖性,使ATR成为癌症治疗的有希望的靶标。 ATR抑制剂使多种肿瘤细胞类型敏感到辐射和DNA损伤剂中,但仅施用ATR抑制剂的效果有限。在本研究中,我们研究了上皮 - 间充质转换(EMT)和EMT转录因子ZeB1对ATR抑制剂VE-821调节细胞敏感性的作用。我们发现Ve-821诱导EMT,伴随的Zeb1上调并促进了Ve-821的抗增殖作用的细胞中的迁移。通过有效地衰减迁移和AKT / ERK信号传导,使用siRNA部分反转Ve-821诱导的EMT和敏化细胞敲击Zeb1。此外,通过增强TOPBP1表达,Zeb1抑制促进CHK1磷酸化并诱导S相停,这表明Zeb1对CHK1的独特调节作用。最后,将VE-821与Zeb1抑制增强的DNA损伤积累。这些结果表明,EMT代表了限制ATR抑制剂的有效性的新机制,因此表明Zeb1抑制可能代表一种提高对ARR抑制剂的效率或逆转抗性的新方法。

著录项

  • 来源
    《Cell cycle》 |2018年第5期|共10页
  • 作者单位

    China Med Univ Dept Med Oncol Hosp 1 Shenyang 110001 Liaoning Peoples R China;

    China Med Univ Dept Oncol Shengjing Hosp Shenyang 110004 Liaoning Peoples R China;

    China Med Univ Dept Med Oncol Hosp 1 Shenyang 110001 Liaoning Peoples R China;

    China Med Univ Dept Med Oncol Hosp 1 Shenyang 110001 Liaoning Peoples R China;

    China Med Univ Dept Med Oncol Hosp 1 Shenyang 110001 Liaoning Peoples R China;

    Dalian Univ Dept Oncol Affiliated Zhongshan Hosp Dalian 116001 Peoples R China;

    China Med Univ Dept Med Oncol Hosp 1 Shenyang 110001 Liaoning Peoples R China;

    China Med Univ Dept Med Oncol Hosp 1 Shenyang 110001 Liaoning Peoples R China;

    China Med Univ Dept Med Oncol Hosp 1 Shenyang 110001 Liaoning Peoples R China;

    China Med Univ Dept Med Oncol Hosp 1 Shenyang 110001 Liaoning Peoples R China;

    China Med Univ Dept Med Oncol Hosp 1 Shenyang 110001 Liaoning Peoples R China;

    China Med Univ Dept Med Oncol Hosp 1 Shenyang 110001 Liaoning Peoples R China;

    China Med Univ Dept Med Oncol Hosp 1 Shenyang 110001 Liaoning Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 细胞生物学;
  • 关键词

    ATR; Chk1; EMT; ZEB1; ATR inhibitor; sensitivity; DNA damage;

    机译:ATR;CHK1;EMT;Zeb1;ATR抑制剂;敏感性;DNA损伤;

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