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An Automated Method to Perform The In Vitro Micronucleus Assay using Multispectral Imaging Flow Cytometry
Published on: May 13, 2019
Live cell imaging of micronucleus formation and development.
Manabu Yasui1, Naoki Koyama, Tomoko Koizumi
1Division of Genetics and Mutagenesis, National Institute of Health Sciences, Tokyo 158-8501, Japan. m-yasui@nihs.go.jp
Mutation Research
|August 10, 2010
Summary
The micronucleus (MN) test reveals distinct mechanisms of micronuclei (MNi) formation depending on the agent used. These MNi are stable and increase cell death, potentially causing genomic instability.
Area of Science:
- Cell Biology
- Genetics
- Biomonitoring
Background:
- The micronucleus (MN) test is a key tool for biomonitoring genotoxic exposure.
- Understanding micronuclei (MNi) development is crucial for interpreting MN test results.
- Current knowledge on MN formation mechanisms is limited.
Purpose of the Study:
- To visualize and characterize micronuclei (MNi) emergence and behavior in real-time.
- To investigate the distinct mechanisms of MN formation induced by different genotoxic agents.
- To assess the stability and cellular impact of MN.
Main Methods:
- Confocal time-lapse imaging of a fluorescent human lymphoblastoid cell line (T105GTCH).
- Differential staining of histone H3 and α-tubulin to track chromosomal components.
- Exposure of cells to mitomycin C (MMC), γ-rays, and vincristine (VC).
Main Results:
- MNi formation mechanisms varied significantly between MMC, γ-rays, and VC treatments.
- MMC and vincristine induced MNi from lagging chromosome fragments and misaligned chromosomes, respectively.
- γ-rays induced MNi from lagging fragments during abnormal multipolar cell division.
- MNi were stable in daughter cells and associated with increased cell death and genomic instability.
Conclusions:
- The MN formation process is agent-specific, involving distinct molecular and cellular mechanisms.
- Micronuclei are persistent cellular structures that can negatively impact cell survival and genomic integrity.
- These findings enhance the understanding of MN test applications in genotoxicity assessment.
