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A two-generation reproduction study with monochlorobenzene vapor in rats
R S Nair1, J A Barter, R E Schroeder
1Monsanto Company, St. Louis, Missouri 63167.
Summary
Monochlorobenzene (MCB) exposure in rats did not affect survival or reproduction. However, male rats exposed to higher MCB concentrations showed liver and kidney changes.
Area of Science:
- Toxicology
- Reproductive Toxicology
- Environmental Health
Background:
- Monochlorobenzene (MCB) is an industrial solvent with potential health risks.
- Understanding the long-term effects of MCB exposure is crucial for occupational and environmental safety.
Purpose of the Study:
- To evaluate the reproductive and developmental toxicity of monochlorobenzene (MCB) in Sprague-Dawley CD rats.
- To assess the impact of chronic MCB exposure on multiple generations (F0 and F1).
Main Methods:
- Sprague-Dawley CD rats (F0) were exposed to MCB vapor (0, 50, 150, 450 ppm) for 10 weeks before mating and through gestation and lactation.
- F1 generation rats were similarly exposed from postweaning for 11 weeks before mating and through gestation and lactation.
- Endpoints included body weight, food consumption, mating/fertility indices, pup/litter survival, and histopathology.
Main Results:
- No significant effects on body weight, food consumption, mating, fertility, or pup/litter survival were observed in any MCB-exposed groups.
- Hepatocellular hypertrophy and renal changes (tubular dilation, interstitial nephritis, regenerative epithelium) were noted in F0 and F1 male rats at 150 and 450 ppm MCB.
Conclusions:
- Monochlorobenzene (MCB) does not appear to cause systemic toxicity affecting reproduction or development at the tested concentrations.
- Male rats exposed to 150 and 450 ppm MCB exhibited target organ toxicity in the liver and kidneys.