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Janus carcinogens and mutagens

R C von Borstel1, J A Higgins

  • 1Department of Biological Sciences, University of Alberta, Edmonton, Alberta, Canada. rc.von-borstel@ualberta.ca

Mutation Research
|July 24, 1998
PubMed
Summary
This summary is machine-generated.

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Certain carcinogens, like tobacco and ionizing radiation, can act as anticarcinogens depending on the conditions. This Janus effect, where agents have dual roles, is observed in various chemical mutagens and environmental exposures.

Area of Science:

  • Toxicology
  • Carcinogenesis
  • Mutagenesis

Background:

  • Janus carcinogens are agents that exhibit both carcinogenic and anticarcinogenic properties, contingent upon factors such as cell type or dosage.
  • Previous research indicates that chemicals carcinogenic to one tissue type may display anticarcinogenic effects on another.
  • This dual action extends to chemical mutagens, with examples showing mutagenic effects in one cellular state and antimutagenic effects in another.

Purpose of the Study:

  • To explore the Janus phenomenon, where carcinogenic agents also exhibit anticarcinogenic properties.
  • To discuss established carcinogens, tobacco and ionizing radiation, as examples of Janus carcinogens.
  • To highlight the complexity of chemical actions, including compounds like thiabendazole with aneugenic and antimutagenic properties.

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Main Methods:

  • Review of existing studies on rodent bioassay data for anticarcinogenic effects.
  • Analysis of historical data on chemical mutagens and their effects in different cellular conditions.
  • Compilation and examination of data on human populations exposed to ionizing radiation.

Main Results:

  • Evidence suggests that many chemicals carcinogenic to one tissue type can be anticarcinogenic to another.
  • Tobacco and ionizing radiation are identified as Janus carcinogens, displaying dual carcinogenic and anticarcinogenic roles.
  • Populations surviving ionizing radiation exposure may exhibit lower cancer rates and longer lifespans than unexposed populations.

Conclusions:

  • The Janus phenomenon, characterized by dual carcinogenic and anticarcinogenic actions, is a recognized property of certain agents.
  • The complex composition of tobacco smoke likely contributes to its Janus carcinogen classification.
  • Understanding the molecular mechanisms underlying Janus activity is crucial, as these are often less understood than direct mutagenic actions.