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Sampling times in micronucleus testing.
P Vanparys1, G Deknudt, F Vermeiren
1Department of Toxicology, Janssen Pharmaceutica, Beerse, Belgium.
Mutation Research
|July 1, 1992
Summary
The mouse bone marrow micronucleus test effectively detects genotoxic agents at 24 and 48 hours. A 72-hour sampling time does not improve the sensitivity for identifying clastogens and aneugens.
Area of Science:
- Toxicology
- Genetics
- Pharmacology
Background:
- The mouse bone marrow micronucleus test is a standard assay for detecting genotoxicity.
- Optimizing sampling times is crucial for maximizing the sensitivity of genotoxicity assays.
Purpose of the Study:
- To evaluate if a 72-hour sampling time enhances the sensitivity of the mouse bone marrow micronucleus test for detecting genotoxic agents.
- To determine the optimal sampling time for identifying clastogens and aneugens.
Main Methods:
- Male and female Swiss albino mice were administered single doses of various known genotoxic agents.
- Mice were sampled at 24, 48, and 72 hours post-dosing to assess micronucleated polychromatic erythrocytes.
- Standard OECD and EEC guidelines were followed for the micronucleus test.
Main Results:
- All tested compounds induced micronuclei at 24 and/or 48 hours.
- The 72-hour sampling time did not increase the sensitivity in detecting genotoxic agents.
- Quantitative differences in sensitivity were observed between male and female mice, but no qualitative differences.
Conclusions:
- A 72-hour sampling time is not necessary for the mouse bone marrow micronucleus test.
- Sampling at 24 and 48 hours is sufficient for screening genotoxic agents, including clastogens and aneugens.
- The test shows consistent sensitivity across sexes for detecting genotoxicity.