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Cytogenetic effects induced by organophosphorus pesticides in mouse spermatocytes
Abstract:
Male mice (Q strain) received a single i.p. injection of 14 organophosphorus compounds, including 11 insecticides, administered on separate occasions. After a recovery period of 10 to 15 days, the cytogenic effects were analyzed in primary spermatocytes at diakinesis-metaphase I corresponding to the treatment of A4-B type spermatogonia. At the highest tolerated dose, trimethylphosphate (1000 mg/kg), triethylphosphate (300 mg/kg), dichlorvos (10 mg/kg), methylparathion (10 mg/kg), ethylparathion (10 mg/kg), ethylparaoxon (0.3 mg/kg), fenitrothion (1000 mg/kg), methylbromophos (1000 mg/kg), ethylbromophos (1000 mg/kg), dimethoate (10 mg/kg), malathion (300 mg/kg), methylazinphos (1 mg/kg), ethylazinphos (1 mg/kg) and trichlorfon (100 mg/kg) did not produce chromosome damage.
Insights
Organophosphorus compounds, including 11 insecticides, were tested for genotoxicity in male mice. At the highest tolerated doses, none of these chemicals induced chromosome damage in spermatocytes.
Area of Science:
- Toxicology
- Genetics
- Environmental Health
Background:
- Organophosphorus compounds are widely used as insecticides.
- Assessing the genotoxic potential of these chemicals is crucial for human and environmental safety.
- Spermatogonia are sensitive targets for detecting chemical-induced genetic damage.
Purpose of the Study:
- To evaluate the cytogenetic effects of 14 organophosphorus compounds in male mice.
- To determine if these compounds induce chromosome damage at the highest tolerated doses.
Main Methods:
- Male Q strain mice were administered single intraperitoneal injections of 14 organophosphorus compounds.
- A recovery period of 10-15 days was allowed.
- Cytogenetic analysis was performed on primary spermatocytes at diakinesis-metaphase I.
Main Results:
- None of the tested organophosphorus compounds, including 11 insecticides, induced chromosome damage in primary spermatocytes.
- This lack of genotoxicity was observed even at the highest tolerated doses for each compound.
Conclusions:
- Under the tested conditions, the evaluated organophosphorus compounds do not appear to be genotoxic.
- Further research may be warranted to explore potential effects at different dose levels or exposure durations.