Sensitization of radio-resistant prostate cancer cells with a unique cytolethal distending toxin.

Sensitization of radio-resistant prostate cancer cells with a unique cytolethal distending toxin.
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DOI:
10.18632/oncotarget.2133
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发表时间:
2014-07-30
期刊:
影响因子:
--
通讯作者:
Hsieh JT
Hsieh JT
中科院分区:
其他
文献类型:
--
作者:
Lai CH;Chang CS;Liu HH;Tsai YS;Hsu FM;Yu YL;Lai CK;Gandee L;Pong RC;Hsu HW;Yu L;Saha D;Hsieh JT

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空肠弯曲杆菌(Campylobacter jejuni)产生的细胞致死膨胀毒素(CDT)是一种诱导哺乳动物细胞周期阻滞和细胞凋亡的基因毒素。最近的研究表明,当DOC-2/DAB2相互作用蛋白(DAB2IP)下调时,前列腺癌(PCa)细胞可以获得放射抗性。在这项研究中,我们发现CDT可以诱导dab2ip缺失的PCa细胞死亡。CDT联合放疗通过抑制电离辐射(IR)诱导的DNA双链断裂(DSB)在G2/M骤停期间的修复,显著诱导dab2ip缺陷PCa细胞死亡,G2/M骤停是由共济失调毛细血管扩张突变(ATM)依赖的DNA损伤检查点反应触发的。我们还发现CDT给药显著增加了异种移植小鼠模型的放疗效果。这些结果表明CDT可能是一种有效的治疗放射性耐药PCa的药物。
Cytolethal distending toxin (CDT) produced by Campylobacter jejuni is a genotoxin that induces cell-cycle arrest and apoptosis in mammalian cells. Recent studies have demonstrated that prostate cancer (PCa) cells can acquire radio-resistance when DOC-2/DAB2 interactive protein (DAB2IP) is downregulated. In this study, we showed that CDT could induce cell death in DAB2IP-deficient PCa cells. A combination of CDT and radiotherapy significantly elicited cell death in DAB2IP-deficient PCa cells by inhibiting the repair of ionizing radiation (IR)-induced DNA double-strand break (DSB) during G2/M arrest, which is triggered by ataxia telangiectasia mutated (ATM)-dependent DNA damage checkpoint responses. We also found that CDT administration significantly increased the efficacy of radiotherapy in a xenograft mouse model. These results indicate that CDT can be a potent therapeutic agent for radio-resistant PCa.
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