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Comparative effects of niridazole on spermatogenesis and reproductive capacity in the mouse, rat and Japanese quail
Abstract:
Niridazole is an effective schistosomicidal compound which, at lower dose levels, affects schistosome gonads. Its antifertility and possible mutagenic effects after various courses of oral treatment were compared in mice, rats and Japanese quail (Coturnix coturnix japonica). In all three species the meiotic stage of spermatogenesis was particularly affected. In mice the highest dose rate (five daily doses of 100 mg/kg) produced sterility during the 4th week. Rats were more susceptible, the compound producing prolonged and, in some animals, permanent sterility against which HCG treatment offered no protection. In quail only a brief phase of sterility occurred. Niridazole appears to be non-mutagenic since dominant lethal mutations were not produced in dose-response studies. Minimal changes in testis histology occurred in the mouse, but in rats severe damage persisted even in animals which had recovered their fertility.
Insights
Niridazole, an effective schistosomicidal drug, causes antifertility effects in mice and rats by impacting spermatogenesis. While generally non-mutagenic, it induced severe testicular damage in rats, even after fertility recovery.
Area of Science:
- Pharmacology
- Toxicology
- Reproductive Biology
Background:
- Niridazole is an established schistosomicidal agent.
- Previous studies suggest effects on reproductive organs at lower doses.
Purpose of the Study:
- To compare the antifertility and potential mutagenic effects of niridazole across different species.
- To investigate the impact of niridazole on spermatogenesis and testicular histology.
Main Methods:
- Oral administration of niridazole to mice, rats, and Japanese quail at varying doses.
- Assessment of fertility, sterility duration, and histological changes in testes.
- Evaluation for dominant lethal mutations to determine mutagenicity.
Main Results:
- Spermatogenesis, specifically the meiotic stage, was significantly affected in all tested species.
- Mice experienced temporary sterility at high doses, while rats showed prolonged or permanent sterility.
- Rats exhibited severe, persistent testicular damage, unlike mice, and HCG treatment was ineffective against niridazole-induced sterility.
- Niridazole did not induce dominant lethal mutations, suggesting it is non-mutagenic.
Conclusions:
- Niridazole exhibits significant antifertility effects, particularly in rodents, by disrupting spermatogenesis.
- The compound demonstrates species-specific toxicity, with rats showing more severe and lasting testicular damage.
- Niridazole is likely non-mutagenic, but its potential for causing persistent testicular damage warrants careful consideration.