Cisplatin induces loop structures and condensation of single DNA molecules.

Cisplatin induces loop structures and condensation of single DNA molecules.
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顺铂诱导环结构和单个 DNA 分子的缩合

DOI:
10.1093/nar/gkn933
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发表时间:
2009-04
影响因子:
14.9
通讯作者:
Wang PY
Wang PY
中科院分区:
生物学2区
文献类型:
--
作者:
Hou XM;Zhang XH;Wei KJ;Ji C;Dou SX;Wang WC;Li M;Wang PY

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用磁镊和原子力显微镜研究了抗癌药物顺铂处理后单个λ DNA的结构特性。在低浓度顺铂的作用下,DNA变得更加柔韧,持续长度从152 nm显著降低到15 nm。在高药物浓度下,观察到DNA缩合现象。基于单分子和原子力显微镜研究的实验结果,我们提出了一个模型来解释这种顺铂的DNA缩合:首先,双加合物诱导DNA的局部扭曲。接下来,通过远处的交联出现了20 nm的微环。然后,通过进一步的交联形成大的聚集体。最后,DNA凝聚成一个紧凑的小球。使用Pt(dach)Cl2的实验表明,奥沙利铂可以以与顺铂相同的方式修饰DNA结构。所观察到的DNA环结构形成可能是结构上类似于顺铂的铂类抗癌药物作用的重要特征。
Structural properties of single λ DNA treated with anti-cancer drug cisplatin were studied with magnetic tweezers and AFM. Under the effect of low-concentration cisplatin, the DNA became more flexible, with the persistence length decreased significantly from ∼52 to 15 nm. At a high drug concentration, a DNA condensation phenomenon was observed. Based on experimental results from both single-molecule and AFM studies, we propose a model to explain this kind of DNA condensation by cisplatin: first, di-adducts induce local distortions of DNA. Next, micro-loops of ∼20 nm appear through distant crosslinks. Then, large aggregates are formed through further crosslinks. Finally, DNA is condensed into a compact globule. Experiments with Pt(dach)Cl2 indicate that oxaliplatin may modify the DNA structures in the same way as cisplatin. The observed loop structure formation of DNA may be an important feature of the effect of platinum anti-cancer drugs that are analogous to cisplatin in structure.
DOI: 10.1073/pnas.181029198
发表时间: 2001-09-11
影响因子: 11.1
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