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Updated: Jan 20, 2026
Tracking Mouse Bone Marrow Monocytes In Vivo
Published on: February 27, 2015
In Vivo Micronucleus Assay in Mouse Bone Marrow
Abhishek Kumar Jain1, Alok Kumar Pandey2
1Nanomaterial Toxicology Group, CSIR-Indian Institute of Toxicology Research, Lucknow, Uttar Pradesh, India.
Abstract:
The presence of genotoxic agents in the environment may cause chromosomal mutations through different mechanisms, which are associated with serious health effects. Genotoxicity is commonly evaluated for the chemical safety assessment, in which the in vivo micronucleus test is paid more attention in the field of genotoxicity as compared to other toxicological endpoints. This assay is an in vivo cytogenetic test which uses erythrocytes in the bone marrow of rodents to detect chemical damage to the chromosomes or mitotic apparatus of mammalian cells. At the time of erythroblast development into a polychromatic erythrocyte (PCEs) in bone marrow, the main nucleus is extruded, so any micronucleus (MN) that has been formed may remain behind in the otherwise anucleated cytoplasm. The damage in the chromosome appears as a small additional nucleus and is readily identifiable by light microscope. An increase in the frequency of micronucleated polychromatic erythrocytes (MN PCEs) in treated animals is an indication of genotoxicity.
Insights
The in vivo micronucleus test detects genotoxicity by identifying chromosomal damage in rodent bone marrow cells. An increased frequency of micronucleated red blood cells (MN PCEs) indicates exposure to genotoxic agents.
Area of Science:
- Environmental Toxicology
- Genetics
- Biomedical Sciences
Background:
- Genotoxic agents in the environment can cause chromosomal mutations, leading to severe health issues.
- Chemical safety assessment relies on evaluating genotoxicity.
- The in vivo micronucleus test is a key assay for genotoxicity testing.
Purpose of the Study:
- To describe the in vivo micronucleus test as a method for assessing genotoxicity.
- To explain the mechanism by which the test detects chromosomal damage.
Main Methods:
- The assay involves examining rodent bone marrow erythrocytes.
- It detects micronuclei (MN), which are small nuclei remaining after cell division.
- Micronuclei indicate damage to chromosomes or the mitotic apparatus.
Main Results:
- The test identifies micronucleated polychromatic erythrocytes (MN PCEs).
- An elevated frequency of MN PCEs in treated animals signifies genotoxicity.
Conclusions:
- The in vivo micronucleus test is a valuable tool for detecting genotoxic effects.
- This cytogenetic assay aids in chemical safety assessments by identifying potential mutagens.
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