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Carcinogenicity study of 3,3'-dimethylbenzidine dihydrochloride in BALB/c mice
G J Schieferstein1, Y Shinohara, R R Allen
1National Center for Toxicological Research, Jefferson, AR 72079.
Summary
3,3-dimethylbenzidine dihydrochloride caused lung cancer in male mice. This study observed a dose-related decrease in time-to-death from lung alveolar cell neoplasms in males exposed to this chemical.
Area of Science:
- Toxicology
- Carcinogenesis
- Experimental Pathology
Background:
- 3,3-dimethylbenzidine dihydrochloride is a chemical compound with limited toxicological data.
- Investigating the carcinogenic potential of novel chemical agents is crucial for public health and environmental safety.
Purpose of the Study:
- To evaluate the potential carcinogenicity of 3,3-dimethylbenzidine dihydrochloride in a rodent model.
- To determine dose-response relationships and identify target organs for toxicity.
Main Methods:
- BALB/c mice (120/sex/dose) were administered varying concentrations (0-140 ppm) of 3,3-dimethylbenzidine dihydrochloride in drinking water.
- Animals were monitored for survival and clinical signs, with necropsy and histopathological examination performed at multiple time points (13-116 weeks).
Main Results:
- A significant dose-related decrease in time-to-death from fatal lung alveolar cell neoplasms was observed in male mice exposed to 140 ppm.
- No significant dose-related trends for lung neoplasms were found in female mice.
- No treatment-related effects on body weight, water consumption, or other observed lesions were noted in either sex.
Conclusions:
- This study provides the first evidence of a neoplastic response to 3,3-dimethylbenzidine dihydrochloride in mice, specifically lung alveolar cell neoplasms in males.
- The findings highlight the potential carcinogenic risk of this compound in male rodents and warrant further investigation into its mechanisms of action.