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Testicular toxicity and infertility in male rats treated with 1,3-dinitrobenzene
Abstract:
Weanling male Sprague-Dawley rats were gavaged 5 d/wk with 1,3-dinitrobenzene (m-DNB) at dosages of 0, 0.75, 1.5, 3.0, and 6.0 mg/kg X d. Males were bred to untreated females during treatment wk 10 and were killed during treatment wk 12. Although males dosed with 3 mg/kg X d inseminated the females and evidence of mating was observed in males dosed with 6 mg/kg X d, none of the males in these groups sired litters. Diminished sperm production (reduced testicular sperm head counts), decreased cauda epididymal sperm reserves, nonmotile spermatozoa, atypical sperm morphology, decreased weights of the testes and epididymides, seminiferous tubular atrophy, and incomplete spermatogenesis were also observed in these groups. Sperm production was also decreased in males dosed with 1.5 mg/kg X d. Changes in the spleen included increased weight at dosages of 1.5 mg/kg X d or higher and splenic hemosiderosis, which ranged from slight in rats treated with 0.75 mg/kg X d to moderately severe in those dosed with 6 mg/kg X d. The data indicate that m-DNB is a potent testicular toxicant in the male rat, capable of producing extensive damage to reproductive tissues and reproductive failure. Limited data on four rats that received 6 mg/kg X d and were allowed a 5-mo posttreatment recovery period suggested that the testicular effects are at least partially reversible.
Insights
1,3-dinitrobenzene (m-DNB) causes significant testicular damage and reproductive failure in male rats. Effects on sperm production and reproductive tissues were observed, though some testicular damage showed partial reversibility post-treatment.
Area of Science:
- Toxicology
- Reproductive Biology
- Environmental Health
Background:
- 1,3-dinitrobenzene (m-DNB) is an industrial chemical with potential toxic effects.
- Understanding the reproductive toxicity of environmental contaminants is crucial for public health.
Purpose of the Study:
- To investigate the testicular toxicity and reproductive effects of 1,3-dinitrobenzene (m-DNB) in male Sprague-Dawley rats.
- To determine the dose-response relationship and reversibility of m-DNB-induced reproductive damage.
Main Methods:
- Weanling male Sprague-Dawley rats were administered varying doses of m-DNB (0-6.0 mg/kg/day) for 12 weeks.
- Reproductive parameters including mating, sperm production, morphology, and organ weights were assessed.
- Histopathological examination of testes and spleen, along with recovery studies, were conducted.
Main Results:
- m-DNB exposure led to reproductive failure, with no litters sired at doses of 3.0 and 6.0 mg/kg/day.
- Significant reductions in sperm production, altered sperm morphology, decreased testicular and epididymal weights, and testicular atrophy were observed.
- Spleen weight increases and hemosiderosis were dose-dependent, indicating systemic effects.
Conclusions:
- 1,3-dinitrobenzene is a potent testicular toxicant in male rats, causing extensive reproductive tissue damage and failure.
- The observed testicular effects were at least partially reversible after a 5-month recovery period.
- These findings highlight the reproductive risks associated with m-DNB exposure.