Comparative mouse micronucleus evaluation in bone marrow and spleen using immunofluorescence and Wright's Giemsa

¹Department of Pathology and Experimental Toxicology, Division of Warner-Lambert Company, Ann Arbor, MI 48105.

|January 1, 1994

Summary

This study validates the antikinetochore antibody (AKA) staining technique for evaluating genetic toxicity in mice. The method effectively distinguishes clastogens and aneugens, confirming its utility in genetic endpoint evaluations.

Area of Science:

Genetics and Toxicology
Mammalian Mutagenesis Studies

Background:

Assessing genotoxicity requires reliable methods to detect chromosomal damage.
Antikinetochore antibody (AKA) staining offers a potential method for evaluating clastogenicity and aneugenicity.

Purpose of the Study:

To evaluate the efficacy of the antikinetochore antibody (AKA) procedure in analyzing bone marrow and spleen toxicity, clastogenicity, and aneugenicity in CD1 mice.
To compare fluorescence micronucleus (MN) analysis with Wright's Giemsa staining for genotoxicity assessment.

Main Methods:

CD1 mice were treated with cyclophosphamide (CP) or vincristine (VC).
Bone marrow and spleen samples were analyzed using AKA staining and Wright's Giemsa stain.
Micronucleated polychromatic erythrocytes (MNPCEs) were quantified, noting kinetochore presence.

Main Results:

Cyclophosphamide (clastogen) induced MNPCEs lacking kinetochores, while vincristine (aneugen) induced MNPCEs with kinetochores.
MNPCE frequency varied significantly between sexes but not between bone marrow and spleen.
Spleen showed lower polychromatic erythrocyte (PCE) to total erythrocyte (TE) ratios than bone marrow, indicating potential toxicity.

Conclusions:

The AKA staining technique is a useful tool for evaluating multiple genetic endpoints, including clastogenicity and aneugenicity, under consistent microscopic conditions.
Fluorescence-based MN analysis with AKA staining provides comparable results to traditional Wright's Giemsa staining.
Sex-dependent differences in genotoxicity responses were observed in mice.

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Comparative mouse micronucleus evaluation in bone marrow and spleen using immunofluorescence and Wright's Giemsa

Area of Science:

Background:

Purpose of the Study:

Main Methods:

Main Results:

Conclusions:

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