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1998 | 45 | 2 |

Tytuł artykułu

DNA topoisomerases as repair enzymes: Mechanism[s] of action and regulation by p53

Warianty tytułu

Języki publikacji

EN

Abstrakty

EN
DNA topoisomerases regulate the organization of DNA and are important targets for many clinically used antineoplastic agents. In addition, DNA topoisomerases modulate the cellular sensitivity toward a number of DNA damaging agents. Increased topoisomerase II activities were shown to contribute to the resistance of both nitrogen mustard- and cisplatin-resistant cells. Similarly, cells with decreased topoisomerase II levels show increased sensitivity to cisplatin, carmustine, mitomycin C and nitrogen mustard. Recent studies propose that topoisomerases may be involved in damage recognition and DNA repair at several different levels including: 1) the initial recognition of DNA lesions; 2) DNA recombination; and 3) regulation of DNA structure. The stress-activated oncogene suppressor protein p53 can modulate the activity of at least three different human topoisomerases, either directly by molecular associations or by transcriptional regulation. Since DNA topoisomerases have considerable recombinase activities, inappropriately activated topoisomerases in tumor cells lacking functional p53 may contribute to the genetic instability of these cells.

Wydawca

-

Rocznik

Tom

45

Numer

2

Opis fizyczny

p.535-544,fig.

Twórcy

autor
  • Institut Gustave-Roussy PR2, Villejuif 94805, Cedex, France
autor
autor
autor

Bibliografia

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Bibliografia

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