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Related Experiment Videos

Radiation-induced bystander effects, carcinogenesis and models.

Carmel Mothersill1, Colin Seymour

  • 1Radiation and Environmental Science Center, Dublin Institute of Technology, Kevin Street, Dublin 8, Ireland. mothers@mcmaster.ca

Oncogene
|October 15, 2003
PubMed
Summary

Radiation-induced bystander effects can cause cancer through genomic instability and mutations, challenging traditional dose-response models. A new model suggests radiation

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Area of Science:

  • Radiation biology
  • Cancer research
  • Genetics

Background:

  • Radiation-induced bystander effects are a phenomenon where cells not directly irradiated exhibit biological changes.
  • These effects have implications for understanding radiation carcinogenesis, particularly at low doses.
  • Traditional models of radiation carcinogenesis focus on direct DNA damage, but bystander effects suggest alternative mechanisms.

Purpose of the Study:

  • To explore the mechanistic and practical implications of radiation-induced bystander effects on carcinogenesis.
  • To investigate how bystander effects challenge existing paradigms of DNA damage-mutation-cancer initiation.
  • To propose a new model that can accommodate the complexity of radiation interactions and their effects on cancer initiation.

Main Methods:

Related Experiment Videos

  • Review of existing literature on radiation-induced bystander effects and carcinogenesis.
  • Analysis of the consequences of bystander effects on DNA damage-mutation-cancer initiation paradigms.
  • Proposal of a 'chaotic' or 'bifurcation' model based on autopoietic theory.

Main Results:

  • Bystander effects can lead to genomic instability, delayed mutations, and potentially second cancers in non-targeted tissues.
  • These effects suggest that radiation carcinogenesis may not solely depend on directly induced DNA mutations.
  • A proposed model accommodates both beneficial (hormetic) and harmful radiation effects, suggesting a disturbance of genetic/epigenetic balance.

Conclusions:

  • Radiation-induced bystander effects play a significant role in carcinogenesis, necessitating a re-evaluation of low-dose risk estimates.
  • Carcinogenesis initiation may involve modifications to the pre-clonal state via genetic and epigenetic mechanisms, not just direct DNA damage.
  • A proposed chaotic/bifurcation model offers a framework to understand the complex interplay of radiation effects, potentially explaining hormesis and emphasizing selection processes in tumor development.