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首页> 外文期刊>Radiotherapy and oncology: Journal of the European Society for Therapeutic Radiology and Oncology >Inhibitory targeting of checkpoint kinase signaling overrides radiation-induced cell cycle gene regulation: a therapeutic strategy in tumor cell radiosensitization?
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Inhibitory targeting of checkpoint kinase signaling overrides radiation-induced cell cycle gene regulation: a therapeutic strategy in tumor cell radiosensitization?

机译:抑制性检查点激酶信号转导的目标超越了辐射诱导的细胞周期基因调控:肿瘤细胞放射增敏的治疗策略?

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BACKGROUND AND PURPOSE: The tumor cell defense response to ionizing radiation involves a temporary arrest at the cell cycle G(2) checkpoint, which is activated by a signaling cascade initiated by the ATM kinase response to DNA damage, ultimately leading to the outcome of further cell survival if the DNA is properly repaired. The inhibitory targeting of the checkpoint kinase signaling elicited by ATM may define a biologically based strategy to override the G(2) phase delay that prevents mitotic entry after DNA damage, thereby increasing the probability of mitotic cell death following exposure to ionizing radiation. MATERIALS AND METHODS: Breast carcinoma cell lines with intact or defective function of the tumor-suppressor protein BRCA1 were exposed to ionizing radiation in the absence or presence of a specific inhibitor (UCN-01) of the checkpoint kinase CHK1, and the response profiles of cell cycle distribution and G(2) phase regulatory factors, as well as the efficiency of clonogenic regrowth, were analyzed. RESULTS: The radiation-induced G(2) phase accumulation was preceded by a transient down-regulation of the G(2) phase-specific polo-like kinase-1 and cyclin B1, which required intact function of both BRCA1 and CHK1. The concomitant treatment with UCN-01 seemed to amplify the cytotoxic effect of ionizing radiation on clonogenic regrowth. CONCLUSION: The effector mechanism of DNA damage on cell cycle gene regulation signals through the checkpoint kinase network. Among molecular cell cycle-targeted drugs currently in pipeline for testing in early phase clinical trials, CHK1 inhibitors may have therapeutic potential as radiosensitizers.
机译:背景和目的:肿瘤细胞对电离辐射的防御反应涉及细胞周期G(2)检查点的暂时停滞,这由ATM激酶对DNA损伤的反应引发的信号级联反应激活,最终导致进一步的结局。 DNA正确修复后的细胞存活率。 ATM引发的对检查点激酶信号转导的抑制性靶向可以定义一种基于生物学的策略,以覆盖G(2)相延迟,从而防止DNA损伤后有丝分裂进入,从而增加暴露于电离辐射后有丝分裂细胞死亡的可能性。材料与方法:在不存在或存在检查点激酶CHK1的特异性抑制剂(UCN-01)的情况下,将具有抑癌蛋白BRCA1完整或有缺陷的乳腺癌细胞株暴露于电离辐射下,并观察其反应情况。细胞周期分布和G(2)阶段调节因素,以及克隆形成的再生效率,进行了分析。结果:辐射诱导的G(2)相积累之前,G(2)相特定的polo样激酶1和细胞周期蛋白B1的瞬时下调,这需要BRCA1和CHK1的完整功能。 UCN-01的伴随治疗似乎放大了电离辐射对克隆形成的再生长的细胞毒性作用。结论:DNA损伤通过检查点激酶网络对细胞周期基因调控信号的影响机制。在早期临床试验中正在测试的针对分子细胞周期的药物中,CHK1抑制剂作为放射增敏剂可能具有治疗潜力。

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