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Clastogenic effects of known and suspect spindle poisons studied by chromosome analysis in mouse bone marrow cells
1Department of Biology, Yunnan Normal University, Kunming, People's Republic of China.
Abstract:
The present study was performed within the project 'Genomic Mutations' (sponsored by the Commission of the European Communities) in order to gather all possible experimental information on 10 chemicals selected on the basis of their possible capacity to induce aneuploidy. An analysis of chromosomal aberrations was carried out in bone marrow cells of mice with the first five chemicals: colchicine (COL), econazole (EZ), chloralhydrate (CH), hydroquinone (HQ) and diazepam (DIAZ). The experiments were performed in parallel to micronucleus tests with the objective to distinguish a positive micronucleus response due to chromosomal breakage from that obtained by lagging chromosomes. The results of the micronucleus tests will be reported elsewhere. COL, CH, EZ and DIAZ showed no clastogenic effects in mouse bone marrow cells after single intraperitoneal injection. Polyploid cells were significantly more frequent after COL treatment. HQ showed a dose-dependent induction of chromosomal aberrations at 6 and 24 h after treatment. After 24 h, cells with multiple aberrations up to complete chromosome fragmentation were frequently observed. They indicate that a small fraction of the cell population, probably related to a specific stage of the cell cycle, was particularly sensitive to HQ. A sex difference in clastogenic response to HQ was not observed. It is concluded that of the five chemicals tested only HQ was clastogenic in mouse bone marrow cells under the present experimental conditions.
Insights
Hydroquinone (HQ) is the only chemical found to be clastogenic in mouse bone marrow cells. While colchicine (COL) increased polyploid cells, HQ induced dose-dependent chromosomal aberrations, indicating its genotoxic potential.
Area of Science:
- Toxicology
- Genetics
- Molecular Biology
Background:
- Aneuploidy is a significant factor in genetic instability and diseases like cancer.
- Identifying chemicals that induce aneuploidy is crucial for public health and safety.
- The 'Genomic Mutations' project aims to evaluate chemicals for their potential to cause genetic mutations.
Purpose of the Study:
- To assess the clastogenic and aneugenic potential of five selected chemicals: colchicine (COL), econazole (EZ), chloralhydrate (CH), hydroquinone (HQ), and diazepam (DIAZ).
- To investigate the effects of these chemicals on chromosomal aberrations in mouse bone marrow cells.
- To differentiate between chromosomal breakage and lagging chromosomes in micronucleus tests.
Main Methods:
- Analysis of chromosomal aberrations in mouse bone marrow cells following single intraperitoneal injections of the test chemicals.
- Dose-response and time-course studies for hydroquinone (HQ).
- Parallel micronucleus tests were conducted (results reported elsewhere).
Main Results:
- Colchicine (COL), econazole (EZ), chloralhydrate (CH), and diazepam (DIAZ) did not exhibit clastogenic effects.
- Colchicine (COL) treatment resulted in a significant increase in polyploid cells.
- Hydroquinone (HQ) demonstrated a dose-dependent induction of chromosomal aberrations, including fragmentation, particularly at 24 hours post-treatment. No sex-related difference in response to HQ was observed.
Conclusions:
- Only hydroquinone (HQ) was identified as clastogenic in mouse bone marrow cells under the tested conditions.
- The results highlight the specific genotoxic risk associated with hydroquinone exposure.
- Further investigation into the mechanism of HQ-induced chromosomal damage is warranted.