Inhibition of the mutagenic effects of N-methyl-N'-nitro-N-nitrosoguanidine and 9-Aminoacridine by indenopyridines in the Salmonella typhimurium tester strain 1537 and E. coli

Abstract

The goal of the present research was to determine the protective potential of five newly synthesized indenopyridine derivatives against N-methyl-N’-nitro-N-nitrosoguanidine (MNNG) and 9-aminoacridine (9-AA) induced mutagenesis. MNNG sensitive Escherichia coli WP2uvrA and 9-AA sensitive Salmonella typhimurium TA1537 were chosen as the bacterial tester strains. All of the test compounds showed significant antimutagenic activity at various tested concentrations. The inhibition rates ranged from 25.6% (Compound 2 - 1?mM/plate) to 68.2% (Compound 1 - 2.5?mM/plate) for MNNG and from 25.7% (Compound 4 - 1?mM/plate) to 76.1% (Compound 3 - 2.5?mM/plate) for 9-AA genotoxicity. Moreover, the mutagenicity of the test compounds was investigated by using the same strains. None of the test compounds has mutagenic properties on the bacterial strains at the highest concentration of 2.5?mM. Thus, the findings of the present study give valuable clues to develop new strategies for chemical prevention from MNNG and 9-AA genotoxicity by using synthetic indenopyridine derivatives.     

Assessment of antimutagenic action of Celtis glabrata Steven ex Planch. (Cannabaceae) extracts against base pair exchange and frame shift mutations on Salmonella typhimurium TA98 and TA100 strains by Ames test

Context: Celtis glabrata is used in Turkey for the treatment of various health disorders. Objective: The acetone, chloroform, ethanol, and methanol extracts of C. glabrata leaf, fruit, and seed were investigated to evaluate their antimutagenic activities. Material and methods: The antimutagenicity of these extracts was determined by Ames test against mutagens (4-nitro-O-phenylenediamine, 2-aminofluorene (2-AF), and sodium azide (SA)). The extracts were used at concentrations between 5 and 0.005?mg/plate. Results: The ethanol extracts of leaves exhibited strong antimutagenicity (70%) against 2-AF with S9 at 5?mg/plate on TA98. But methanol (61%, 53%) and acetone (53%, 52%) also revealed strong inhibition rates at concentrations of ≥0.5?mg/plate. Among the extracts, the highest activity (96%) was obtained from acetone extract against SA without S9, followed by chloroform extract (91%) at a dose of 5?mg/plate on TA100 with S9. Ethanol (without S9) and chloroform (with S9) extracts showed strong antimutagenicity at all doses. Exception of chloroform and acetone (without S9), all fruit extracts (with/without S9) manifested strong antimutagenicity at doses of?≥0.5?mg/plate on TA98 strain. Ethanol extracts revealed 68% inhibition against 2-AF on TA98. Acetone and ethanol extracts manifested 84% and 82% inhibition against SA on TA100, respectively. All the extracts of seeds revealed strong inhibition against 2-AF at?≥0.5?mg/plate doses on TA98, but acetone extract showed excellent antimutagenicity (94%). Moreover, the chloroform (74, 73, 63, 54%), acetone (74, 72, 70, 65%) and methanol (74, 67, 63, 61%) extracts of seeds revealed strong antimutagenic activity on TA100 against SA with S9. Discussion and conclusion: This plant may be natural source of antimutagenic agents.