Tumor cell death induced by topoisomerase-targeting drugs

Annu Rev Pharmacol Toxicol. 2001;41:53-77. doi: 10.1146/annurev.pharmtox.41.1.53.


DNA topoisomerases are double-edged swords. They are essential for many vital functions of DNA during normal cell growth. However, they are also highly vulnerable under various physiological and nonphysiological stresses because of their delicate act on breaking and rejoining DNA. These stresses (e.g. exposure to topoisomerase poisons, acidic pH, and oxidative stresses) can convert DNA topoisomerases into DNA-breaking nucleases, resulting in cell death and/or genomic instability. The importance of topoisomerase-mediated DNA cleavage in tumor cell death and carcinogenesis has been recognized. This review focuses on recent findings concerning the molecular mechanisms of the stress responses to topoisomerase-mediated DNA damage. The involvement of ubiquitin/26S proteasome and SUMO/UBC9 in these processes, as well as the role of topoisomerase cleavable complexes in apoptotic cell death are discussed.

Publication types

  • Research Support, U.S. Gov't, P.H.S.
  • Review

MeSH terms

  • Animals
  • Antineoplastic Agents / pharmacology*
  • Cell Death / drug effects
  • Enzyme Inhibitors / pharmacology*
  • Humans
  • Neoplasms / drug therapy*
  • Neoplasms / pathology*
  • Topoisomerase I Inhibitors*


  • Antineoplastic Agents
  • Enzyme Inhibitors
  • Topoisomerase I Inhibitors