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Cisplatin induces loop structures and condensation of single DNA molecules

Authors :
Ming Li
Chao Ji
Xinghua Zhang
Peng-Ye Wang
Wei-Chi Wang
Xi-Miao Hou
Kong-Ji Wei
Shuo-Xing Dou
Source :
Nucleic Acids Research
Publication Year :
2009
Publisher :
Oxford University Press, 2009.

Abstract

Structural properties of single lambda 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 approximately 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 approximately 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)Cl(2) 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.

Details

Language :
English
ISSN :
13624962 and 03051048
Volume :
37
Issue :
5
Database :
OpenAIRE
Journal :
Nucleic Acids Research
Accession number :
edsair.doi.dedup.....da920d5ea381fc7db4d1acab0d679222