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N-Nitrosodiethylamine mutagenicity at low concentrations
Claudia Alessandra Fortes Aiub1, Luis Felipe Ribeiro Pinto, Israel Felzenszwalb
1Departamento de Biofísica e Biometria, Instituto de Biologia Roberto Alcântara Gomes, Universidade do Estado do Rio de Janeiro, Av. 28 de setembro, 87 fds., 4 andar, 20551-030 Rio de Janeiro, Brazil.
Toxicology Letters
|September 10, 2003
Summary
N-Nitrosodiethylamine (NDEA) shows mutagenic effects at low doses. Sensitive testing methods like the SOS chromotest and Ames test detected NDEA
Area of Science:
- Environmental Toxicology
- Molecular Toxicology
- Genetics
Background:
- N-Nitrosodiethylamine (NDEA) is a compound requiring metabolic activation by cytochrome P450 enzymes.
- NDEA can form electrophilic species that interact with DNA.
- While not a primary endpoint in genotoxicity assays, NDEA has been historically viewed as a weak carcinogen.
Purpose of the Study:
- To investigate the mutagenicity of N-Nitrosodiethylamine (NDEA) at low concentrations.
- To determine if sensitive genotoxicity assays can detect NDEA's mutagenic potential at reduced exposure levels.
Main Methods:
- Utilized the SOS chromotest with metabolic activation to assess NDEA mutagenicity.
- Employed the Ames test with highly sensitive bacterial strains and a metabolic activation mixture (S9 mix).
Main Results:
- The SOS chromotest revealed positive mutagenicity for NDEA in the concentration range of 0.75 to 36.46 microg/ml.
- The Ames test also detected positive mutagenic responses for NDEA between 1.01 x 10(-3) and 50.64 x 10(-3 microg per plate.
Conclusions:
- NDEA exhibits detectable mutagenicity even at low concentrations.
- The use of more sensitive genotoxicity testing conditions enhances the detection of NDEA's mutagenic activity.