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Tumor cell death induced by topoisomerase-targeting drugs

T K Li1, L F Liu

  • 1Department of Pharmacology, UMDNJ-Robert Wood Johnson Medical School, 675 Hoes Lane, Piscataway, New Jersey 08854, USA. tsli@umdnj.edu

Annual Review of Pharmacology and Toxicology
|March 27, 2001
PubMed

Insights

DNA topoisomerases are crucial for DNA function but vulnerable to stress, leading to DNA damage. This review explores how cells respond to this damage, focusing on molecular mechanisms and cell death pathways.

Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • DNA topoisomerases are essential enzymes for DNA replication and transcription.
  • These enzymes are vulnerable to various stresses, which can lead to DNA breaks.
  • Topoisomerase-mediated DNA damage is implicated in cancer development and cell death.

Purpose of the Study:

  • To review recent findings on molecular mechanisms of stress responses to topoisomerase-mediated DNA damage.
  • To discuss the involvement of ubiquitin/26S proteasome and SUMO/UBC9 pathways.
  • To explore the role of topoisomerase cleavable complexes in apoptosis.

Main Methods:

  • Literature review of recent studies on DNA topoisomerase stress responses.
  • Analysis of molecular pathways involved in DNA damage repair and cell death.
  • Discussion of the role of specific protein modification systems (ubiquitin, SUMO).

Main Results:

  • Stresses can convert DNA topoisomerases into DNA-breaking nucleases.
  • Cellular stress responses involve ubiquitin/26S proteasome and SUMO/UBC9 pathways.
  • Topoisomerase cleavable complexes play a role in initiating apoptotic cell death.

Conclusions:

  • Understanding stress responses to topoisomerase damage is crucial for cancer therapy.
  • Targeting these pathways may offer novel strategies for cancer treatment.
  • DNA topoisomerases represent a critical link between DNA integrity and cell fate.

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