The m-, o- and p-isomers of aminobenzoic acid (ABA) repressed the mutagenicity of N-methyl-N′-nitro-N-nitrosoguanidine (MNNG) in Salmonella typhimurium TA100. Their antimutagenic potency was in the order of o-ABA >m-ABA > p-ABA. The mechanism of this antimutagenicity is ascribed mainly to the decomposition of MNNG induced by the aminobenzoic acid isomers outside or within the bacterial cells. The inhibition of plant cell peroxidases and bacterial acetyltransferases that are required for the plant activation of 2-aminofluorene (2-AF) to mutagenic product(s) may participate in the repression of 2-AF mutagenesis by the aminobenzoic acids in S. typhimurium strain YG1024. The aminobenzoic acid isomers exhibited no inhibitory effects towards the direct-acting agent 2-acetoxy-2-acetylaminofluorene, the stable diacetylated metabolic product of 2-AF.
- Mechanisms of antimutagenicity
- para-Aminobenzoic acid
ASJC Scopus subject areas
- Molecular Biology
- Health, Toxicology and Mutagenesis