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CometChip: A High-throughput 96-Well Platform for Measuring DNA Damage in Microarrayed Human Cells
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Comet assay and hormesis.

Edward J Calabrese1, Paul B Selby2

  • 1Department of Environmental Health Sciences, Morrill I, N344, University of Massachusetts, Amherst, MA, 01003, USA.

Environmental Pollution (Barking, Essex : 1987)
|November 18, 2023
PubMed
Summary
This summary is machine-generated.

This study reveals that many genotoxic chemicals exhibit hormetic dose responses, a non-linear biological effect. These findings impact toxicological study design and risk assessment for genotoxicity testing.

Keywords:
BiphasicCancer risk assessmentComet assayDose responseGenotoxicityHormesis

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Area of Science:

  • Toxicology
  • Genotoxicity
  • Biochemistry

Background:

  • Hormesis, a dose-response phenomenon, is increasingly recognized in toxicology.
  • The Comet assay is a standard method for assessing DNA damage (genotoxicity).
  • Previous assessments of hormesis have not systematically focused on Comet assay data.

Purpose of the Study:

  • To conduct the first comprehensive assessment of hormetic dose responses specifically within Comet assay studies.
  • To evaluate the frequency and characteristics of hormesis in genotoxicity data.
  • To explore the implications of hormesis for toxicological study design and risk assessment.

Main Methods:

  • Systematic review of peer-reviewed Comet assay studies using predefined evaluative criteria.
  • Inclusion of studies from the Hormetic Database.
  • Analysis of dose-response relationships for genotoxic agents across various cell types and chemical classes.

Main Results:

  • Numerous instances of hormetic dose responses were identified in Comet assay data.
  • Hormesis was observed across diverse cell types and a wide range of chemical agents.
  • An estimated frequency of hormesis in Comet assay studies was found to be approximately 40%.

Conclusions:

  • A significant proportion of genotoxic chemicals show evidence of hormetic dose responses when analyzed with the Comet assay.
  • The prevalence of hormesis necessitates re-evaluation of study designs, including dose selection and spacing.
  • Understanding hormesis in genotoxicity testing is crucial for accurate risk assessment and regulatory decision-making.