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Oncogenicity tests of p-nitroso-N,N-dimethylaniline and p-nitroso-N,N-diethylaniline in NZR rats and NZO mice
Abstract:
Whole-of-life tests of the C-nitroso compounds p-nitrosodimethylaniline (NDMA) and p-nitroso-diethylaniline (NDEA) have been completed in male rats and mice fed maximum tolerated doses continuously over the first halves of their respective natural lifespans. The chemicals were offered at a concentration of 300 mg/litre drinking fluid, but the doses of NDEA consumed were only 75% of the NDMA doses, in both species. Possibly because of this the results with NDEA were statistically not clear-cut, but there was a significant increase in tumour incidence after NDMA treatment in both species. The main sites of tumorigenesis after NDMA were lung, kidney and malignant lymphoma in the rats, and lung, duodenum and malignant lymphoma in the mice. The results confirm our own earlier experiment and provide the first evidence of oncogenic activity in this class of compounds.
Insights
Whole-of-life tests show p-nitrosodimethylaniline (NDMA) significantly increased tumor incidence in rats and mice. This study provides the first evidence of oncogenic activity for C-nitroso compounds.
Area of Science:
- Toxicology
- Carcinogenesis
Background:
- C-nitroso compounds are a class of chemicals with potential toxicological effects.
- Previous research has not conclusively established the oncogenic potential of these compounds.
Purpose of the Study:
- To investigate the whole-of-life carcinogenic activity of p-nitrosodimethylaniline (NDMA) and p-nitrosodiethylaniline (NDEA) in male rats and mice.
Main Methods:
- Male rats and mice were administered maximum tolerated doses of NDMA and NDEA in drinking fluid over the first half of their natural lifespans.
- Tumor incidence was monitored throughout the study period.
Main Results:
- NDMA treatment led to a statistically significant increase in tumor incidence in both rats and mice.
- Key tumor sites in rats included lung, kidney, and malignant lymphoma.
- In mice, NDMA induced tumors in the lung, duodenum, and malignant lymphoma.
- NDEA did not produce statistically clear-cut results, possibly due to lower consumed doses.
Conclusions:
- NDMA demonstrates clear oncogenic activity in rodents.
- This study provides the first evidence of carcinogenicity for C-nitroso compounds.
- Further research may be warranted to explore the mechanisms of NDMA-induced carcinogenesis.