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5-Nitroacenaphthene: a newly recognized role for the nitro function in mutagenicity
Environmental Mutagenesis
|January 1, 1983
Summary
The mutagenicity of 5-nitroacenaphthene in Salmonella typhimurium bacteria relies on nitro reduction. Microsomal enzyme activity enhances mutagenicity through acenaphthene oxidation, bypassing nitroreductase deficiencies.
Area of Science:
- Environmental chemistry
- Toxicology
- Molecular biology
Background:
- 5-nitroacenaphthene is a mutagenic compound.
- Its mutagenicity in Salmonella typhimurium is linked to nitro group reduction.
Purpose of the Study:
- To investigate the role of nitro reduction and oxidation in the mutagenicity of 5-nitroacenaphthene.
- To elucidate the metabolic pathways involved in 5-nitroacenaphthene-induced mutagenicity.
Main Methods:
- Bacterial mutagenicity assays using Salmonella typhimurium strains.
- Comparison of mutagenicity in wild-type and mutant strains (nitroreductase-deficient, arylhydroxylamine esterifying-deficient).
- Inclusion of rat liver microsomal preparations to assess metabolic activation.
Main Results:
- Mutagenicity significantly decreased in nitroreductase-deficient strains, indicating dependence on nitro reduction.
- Addition of microsomal preparations increased mutagenicity, bypassing enzymatic deficiencies.
- Microsome-induced mutagenicity is attributed to oxidation of the acenaphthene moiety, not nitro reduction.
Conclusions:
- The nitro function directs ring oxidation, influencing the mutagenic potential of 5-nitroacenaphthene.
- Metabolic activation by microsomal enzymes, primarily through oxidation, is crucial for 5-nitroacenaphthene mutagenicity.
- Understanding these pathways is vital for assessing the toxicological risks of nitroaromatic compounds.