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Simplified mouse peripheral reticulocyte micronucleus test with dimethylnitrosamine
1Toxicology Research Laboratories, Japan Tobacco Inc., Kanagawa.
Abstract:
The induction of micronuclei by treatment with dimethylnitrosamine was evaluated and compared in peripheral blood and bone marrow cells of male CD-1 mice. Peripheral blood preparations were made on acridine orange (AO)-coated slides and scanned by fluorescence microscopy. A significant increase in micronuclei was observed 24 h after treatment in bone marrow polychromatic erythrocytes, and 24-48 h after treatment in peripheral reticulocytes. The peak frequency of micronuclei in peripheral reticulocytes was delayed by about 24 h relative to bone marrow polychromatic erythrocytes. This micronucleus test using peripheral blood was shown to be easy to do and as sensitive as the test using bone marrow cells. From this result, it is concluded that the method with AO-coated slides and peripheral blood is as suitable as bone marrow cells for the micronucleus assay.
Insights
This study compared micronucleus tests in mouse bone marrow and peripheral blood. Peripheral blood micronucleus assays are as sensitive and easier to perform than bone marrow assays.
Area of Science:
- Toxicology
- Genetics
Background:
- The micronucleus test is a standard genotoxicity assay.
- Assessing genotoxicity in peripheral blood offers potential advantages over bone marrow sampling.
Purpose of the Study:
- To compare the efficacy and sensitivity of the micronucleus assay in peripheral blood versus bone marrow cells.
- To evaluate the use of acridine orange-coated slides for peripheral blood micronucleus detection.
Main Methods:
- Male CD-1 mice were treated with dimethylnitrosamine.
- Micronuclei were analyzed in bone marrow polychromatic erythrocytes and peripheral blood reticulocytes.
- Peripheral blood slides were prepared using acridine orange (AO)-coated slides and examined via fluorescence microscopy.
Main Results:
- A significant increase in micronuclei was observed in both bone marrow and peripheral blood cells post-treatment.
- The peak frequency of micronuclei in peripheral reticulocytes was observed 24-48 hours after treatment, approximately 24 hours later than in bone marrow.
- The peripheral blood micronucleus test demonstrated comparable sensitivity to the bone marrow assay.
Conclusions:
- The micronucleus assay using peripheral blood with AO-coated slides is a viable and sensitive alternative to the traditional bone marrow assay.
- This method is easier to perform and suitable for genotoxicity testing.