Topoisomerase I inhibition in colorectal cancer: biomarkers and therapeutic targets.

Topoisomerase I inhibition in colorectal cancer: biomarkers and therapeutic targets.
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DOI:
10.1038/bjc.2011.498
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发表时间:
2012-01-03
影响因子:
8.8
通讯作者:
El-Khamisy, S. F.
El-Khamisy, S. F.
中科院分区:
医学1区
文献类型:
--
作者:
Gilbert, D. C.;Chalmers, A. J.;El-Khamisy, S. F.

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拓扑异构酶 I(Top 1)毒物伊立替康是现代结直肠癌治疗的重要组成部分。通过稳定 Top 1-DNA 复合物,伊立替康产生 Top 1 连接的 DNA 单链断裂,这些断裂可以演变成双链断裂并最终导致细胞死亡。然而,癌细胞可能通过从 DNA 末端释放停滞的拓扑异构酶来克服细胞杀伤,从而降低临床上第一大毒物的功效。因此,了解 Top 1 介导的 DNA 损伤修复中涉及的 DNA 修复机制,为识别预测此类化疗反应的潜在生物标志物提供了有用的工具。此外,针对这些途径可以增强第一大毒物的治疗效果。在这篇综述中,我们描述了针对细胞中 Top 1 活性的细胞机制和后果。我们总结了临床前数据并讨论了关键蛋白质的小分子抑制剂的潜在临床用途。
The topoisomerase I (Top 1) poison irinotecan is an important component of the modern treatment of colorectal cancer. By stabilising Top 1-DNA complexes, irinotecan generates Top 1-linked DNA single-strand breaks that can evolve into double-strand breaks and ultimately cause cell death. However, cancer cells may overcome cell killing by releasing the stalled topoisomerase from DNA termini, thereby reducing the efficacy of Top 1 poisons in clinics. Thus, understanding the DNA repair mechanisms involved in the repair of Top 1-mediated DNA damage provides a useful tool to identify potential biomarkers that predict response to this class of chemotherapy. Furthermore, targeting these pathways could enhance the therapeutic benefits of Top 1 poisons. In this review, we describe the cellular mechanisms and consequences of targeting Top 1 activity in cells. We summarise preclinical data and discuss the potential clinical utility of small-molecule inhibitors of the key proteins.
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