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Suppressive effect of aspirin on chromosome aberration induced by mitomycin C in mice
M Niikawa1, T Nakamura, H Nagase
1Ichinomiya Women's Junior College, Japan.
Abstract:
Chromosome aberrations induced by mitomycin C (MMC) were suppressed by aspirin in a mouse micronucleus test with peripheral blood and bone marrow cells. Aspirin at doses of 0.5, 5, and 50 mg/kg was injected intraperitoneally or per administered orally 0.5, 6, or 24 h after administration of MMC and then peripheral blood and/or bone marrow cells were sampled 48 h after administration of MMC. The suppressive effect of aspirin was more pronounced in the aspirin-treated groups 24 h than 0.5 and 6 h after administration of MMC. In the aspirin-treated group at 24 h, the frequency of polychromatic erythrocytes with micronuclei was decreased by about 60-80% after intraperitoneal injection and by about 40-70% after oral administration. It is suggested that aspirin may directly act on MMC metabolites, but not on MMC itself.
Insights
Aspirin suppressed mitomycin C (MMC)-induced chromosome damage in mice. This protective effect was strongest when aspirin was given 24 hours after MMC exposure, suggesting it targets MMC metabolites.
Area of Science:
- Toxicology
- Pharmacology
- Genetics
Background:
- Mitomycin C (MMC) is a chemotherapeutic agent known to induce chromosome aberrations.
- Understanding protective agents against genotoxicity is crucial for mitigating side effects.
Purpose of the Study:
- To investigate the potential suppressive effects of aspirin on mitomycin C-induced chromosome aberrations in a mouse model.
- To determine the optimal timing and administration route for aspirin's protective action.
Main Methods:
- A mouse micronucleus test was employed using peripheral blood and bone marrow cells.
- Aspirin was administered via intraperitoneal injection or orally at varying doses and time points (0.5, 6, 24 hours) after MMC exposure.
- Cellular damage was assessed 48 hours post-MMC administration.
Main Results:
- Aspirin significantly suppressed MMC-induced chromosome aberrations in a dose-dependent manner.
- The suppressive effect was most pronounced when aspirin was administered 24 hours after MMC.
- Intraperitoneal aspirin injection at 24 hours reduced micronuclei frequency by 60-80%, while oral administration reduced it by 40-70%.
Conclusions:
- Aspirin exhibits a protective effect against mitomycin C genotoxicity in mice.
- The timing of aspirin administration is critical, with later administration showing greater efficacy.
- Aspirin likely acts on mitomycin C metabolites rather than the parent compound.