Cancer esearch cular and Cellular Pathobiology ence of an Adaptive Response Targeting DNA homologous End Joining and Its R nsmission to Bystander Cells

Cancer esearch cular and Cellular Pathobiology ence of an Adaptive Response Targeting DNA homologous End Joining and Its R nsmission to Bystander Cells
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靶向 DNA 同源末端连接的适应性反应及其对旁观细胞的传递的癌症研究和细胞病理学

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发表时间:
2010
期刊:
影响因子:
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通讯作者:
G. Iliakis
G. Iliakis
中科院分区:
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作者:
Holge;R. Klammer;Munira Kadhim;G. Iliakis

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负载 ptive 反应 (AR) 是一个术语,描述对电离辐射诱导的 nt 染色体杀伤或形成的抵抗力,这是通过预先暴露于低电离辐射剂量介导的。其机制难以捉摸。由于细胞杀伤和染色体畸变形成源自错误的 DNA 双链断裂 (DSB) 过程,AR 可能反映了非同源重组 (NHEJ) 或同源重组修复对 DSB 加工的调节。在这里,我们使用质粒末端连接测定来量化低电离辐射剂量诱导的 NHEJ 的反应,NHEJ 是高剂量 DSB 修复的主要途径,并通过将培养基转移到未受辐射的旁观者胚胎成纤维细胞中来研究这种反应的传播,用 10 至 1000 mGy 进行调节,并通过用含有 DSB 的报告质粒进行挑战,在不同时间对 NHEJ 进行定量。我们发现暴露于电离辐射 >100 mGy 的小鼠胚胎成纤维细胞中 NHEJ effiin 显着增加,无论报告质粒如何。人类肿瘤细胞也显示出类似程度的 AR,但受到咖啡因的影响,咖啡因是一种 amage 信号传导抑制剂,通过抑制 ATM、ATR 和 DNA-PKcs 发挥作用。来自预辐照的生长培养基在未辐照的细胞中引起咖啡因敏感的 AR,其程度与在辐照的细胞中观察到的相似。在 tander 细胞中,γH2AX 焦点在 S-G2 期晚期被特异性检测到,并且与 Rad51 焦点相关,表明同源重组修复的功能,可能是在 DNA 复制介导的 DSB 上。结果表明 NHEJ 增强是 AR 的一种机制,并表明 AR 可能通过产生复制介导的 DSB 的因子传递给旁观细胞。癌症研究; 70(21); 8498–506。 ©2010 AACR。
nloaded ptive response (AR) is a term describing resistance to ionizing radiation–induced killing or formation of nt chromosomes that is mediated by pre-exposure to low ionizing radiation doses. The mechanism of ains elusive. Because cell killing and chromosome aberration formation derive from erroneous procesf DNA double-strand breaks (DSB), AR may reflect a modulation of DSB processing by nonhomologous ining (NHEJ) or homologous recombination repair. Here, we use plasmid end-joining assays to quantify lations induced by low ionizing radiation doses to NHEJ, the dominant pathway of DSB repair in higher otes, and investigate propagation of this response through medium transfer to nonirradiated bystander ouse embryo fibroblasts were conditioned with 10 to 1000 mGy and NHEJ quantified at different times fter by challenging with reporter plasmids containing a DSB. We show robust increases in NHEJ effiin mouse embryo fibroblasts exposed to ionizing radiation >100 mGy, irrespective of reporter plasmid Human tumor cells also show AR of similar magnitude that is compromised by caffeine, an inhibitor of amage signaling acting by inhibiting ATM, ATR, and DNA-PKcs. Growth medium from pre-irradiated duces a caffeine-sensitive AR in nonirradiated cells, similar in magnitude to that seen in irradiated cells. tander cells, γH2AX foci are specifically detected in late S-G2 phase and are associated with Rad51 foci ignify the function of homologous recombination repair, possibly on DNA replication–mediated DSBs. that s The results point to enhanced NHEJ as a mechanism of AR and suggest that AR may be transmitted to bystander cells through factors generating replication-mediated DSBs. Cancer Res; 70(21); 8498–506. ©2010 AACR.
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