Effect of Substituted Aryl Group in Water-soluble Porphyrins on 2-Aminofluorene Activation in Ames Assay

Chemical models for cytochrome P450, consisting of an iron porphyrin complex and an oxidant, have been used as substitutes for the S-9 mix for detecting mutagenicity of promutagens in the Ames assay. In this study, we developed optimized procedures for the Ames mutation assay using a water-insoluble...

Full description

Saved in:
Bibliographic Details
Published in:Journal of Health Science 2009, Vol.55(1), pp.109-113
Main Authors: Inami, Keiko, Inokawa, Akiko, Sugita, Yayoi, Mochizuki, Masataka
Format: Article
Language:English
Subjects:
aromatic amine
chemical model
cytochrome P450
iron porphyrin
metabolic activation
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Chemical models for cytochrome P450, consisting of an iron porphyrin complex and an oxidant, have been used as substitutes for the S-9 mix for detecting mutagenicity of promutagens in the Ames assay. In this study, we developed optimized procedures for the Ames mutation assay using a water-insoluble 5,10,15,20-tetrakis(pentafluorophenyl)porphyrinatoiron(III) chloride (F5P) or a water-soluble 5,10,15,20-tetrakis(1-methylpyridinium-4-yl)porphyrinatoiron(III) (4-MPy) plus tert-butyl hydroperoxide (t-BuOOH) as a chemical model to determine 2-aminofluorene (AF) mutagenicity. The model system including the water-insoluble F5P plus t-BuOOH demonstrated higher AF mutagenicity when the tester strain was added following the incubation period of the reaction mixture. In contrast, in the system including the water-soluble 4-MPy plus t-BuOOH, the activity of AF mutagenicity was highest when the tester strain was added to the reaction mixture prior to incubation. It is thus possible to detect short-lived mutagenic metabolites by the latter procedure. AF mutagenicity was compared among diverse water-soluble iron porphyrins plus t-BuOOH. The results showed that a cationic 4-MPy/t-BuOOH had the highest capacity for mutagenic activation of AF among the chemical models tested.
ISSN:1344-9702
1347-5207
DOI:10.1248/jhs.55.109