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Mutagenicity tests of the antithyroid agent thiamazole. Cytogenetic studies on male mice
Abstract:
The mutagenic potential of thiamazole, an antithyroid agent, was investigated by an in vivo cytogenetic test and was compared with those of mitomycin C and vincristine. These drugs were subcutaneously injected into slc-ICR male mice either as a single dose or as multiple doses for 5 successive days. Thiamazole (90 or 180 mg/kg) did not increase the number of micronuclei in bone marrow cells. This drug also did not induce chromosomal aberrations in spermatogonium, spermatocyte, or bone marrow cells. On the other hand, mitomycin C (3.0 mg/kg) increased the appearance of chromosomal aberrations and micronuclei. Vincristine (0.2 mg/kg) induced bone marrow cells with a so called large micronucleus (d greater than or equal to D/4). These results suggest that thiamazole may not have significant effects on the genetic systems of mice.
Insights
Thiamazole, an antithyroid drug, was evaluated for mutagenic potential in mice. The study found no evidence that thiamazole causes genetic damage, unlike other tested drugs.
Area of Science:
- Pharmacology
- Toxicology
- Genetics
Background:
- Thiamazole is a widely used antithyroid agent.
- Understanding its potential mutagenicity is crucial for patient safety.
- Cytogenetic tests provide in vivo evidence of genetic damage.
Purpose of the Study:
- To investigate the in vivo mutagenic potential of thiamazole.
- To compare the genotoxicity of thiamazole with known mutagens mitomycin C and vincristine.
- To assess chromosomal damage in various mouse cell types.
Main Methods:
- In vivo cytogenetic assays were performed on male slc-ICR mice.
- Drugs were administered via subcutaneous injection, either single or multiple doses.
- Bone marrow and germ cells (spermatogonia, spermatocytes) were analyzed for micronuclei and chromosomal aberrations.
Main Results:
- Thiamazole (90 or 180 mg/kg) did not increase micronuclei in bone marrow cells.
- Thiamazole did not induce chromosomal aberrations in spermatogonia, spermatocytes, or bone marrow cells.
- Mitomycin C and vincristine demonstrated genotoxic effects, confirming assay sensitivity.
Conclusions:
- Thiamazole does not appear to possess significant mutagenic or genotoxic effects in mice.
- The findings suggest a favorable genetic safety profile for thiamazole.
- Further research may explore long-term or different exposure scenarios.