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SFTG international collaborative study on in vitro micronucleus test IV. Using CHL cells.
Akihiro Wakata1, Atsuko Matsuoka, Kohji Yamakage
1Astellas Pharma Inc., Drug Safety Research Laboratories, Osaka, Japan.
Mutation Research
|June 20, 2006
Summary
This international study found Chinese hamster lung (CHL) cells effective for the in vitro micronucleus test. The assay accurately detects clastogenic and aneugenic compounds, supporting standardized genotoxicity testing protocols.
Area of Science:
- Genotoxicity testing
- In vitro assays
- Cellular toxicology
Background:
- The in vitro micronucleus assay is crucial for assessing chemical genotoxicity.
- Standardization of protocols is needed for reliable results.
- Chinese hamster lung (CHL) cells are a common model for these assays.
Purpose of the Study:
- To evaluate the efficacy of the in vitro micronucleus assay using CHL cells.
- To compare different treatment and recovery times for assay optimization.
- To establish a standardized protocol for genotoxicity testing.
Main Methods:
- An international collaborative study involving fourteen laboratories.
- Assessment of nine coded substances with varying modes of action.
- Comparison of short and long treatment periods with varying recovery times, with or without cytochalasin B.
Main Results:
- Mannitol and clofibrate were consistently negative.
- Bleomycin, colchicine, diethylstilboestrol, and griseofulvin showed positive results.
- Urethane yielded equivocal results only under specific long-treatment conditions.
Conclusions:
- CHL cells are suitable for accurately detecting clastogenic and aneugenic compounds.
- Standardized protocols using CHL cells can reliably identify genotoxic substances.
- The study supports the use of CHL cells in genotoxicity testing.