著者

Keiko Inami Masataka Mochizuki

出版者

The Japanese Environmental Mutagen Society

雑誌

Genes and Environment (ISSN:18807046)

巻号頁・発行日

vol.30, no.3, pp.71-76, 2008 (Released:2008-09-09)

参考文献数

12

被引用文献数

2 2

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2-Acetylaminofluorene (AAF) is a procarcinogen and its activation mechanisms have been investigated in detail. AAF was metabolized to 2-acetylamino-9-fluorenone (AAF=O) and 2-acetylamino-9-fluorenol by S9 mix. The mutagenicity of AAF=O in the presence of S9 mix was equal in potency to that of AAF in Salmonella typhimurium TA1538, but the activation mechanism of AAF=O was poorly reported. In this study, we investigated possible ultimate species derived from AAF=O; N-hydroxy-2-acetylamino-9-fluorenone (N-OH-AAF=O), N-acetoxy-2-acetylamino-9-fluorenone (N-OAc-AAF=O), N-hydroxy-2-amino-9-fluorenone (N-OH-AF=O), and N-acetoxy-2-trifluoroacetylamino-9-fluorenone (N-OAc-TFAAF=O), a model compound for N-acetoxy-2-amino-9-fluorenone (N-OAc-AF=O), were synthesized and their mutagenicity was examined in S. typhimurium TA1538. The activation mechanism in S. typhimurium TA1538 was also investigated. The compounds in order of decreasing mutagenicity are N-OAc-TFAAF=O>N-OH-AF=O>N-OAc-AAF=O> N-OH-AAF=O. AAF=O is at least partially responsible for the mutagenicity of AAF, since a small amount of AAF is oxidized to AAF=O in the presence of S9 mix. Furthermore we suggest that an ultimate active species of AAF=O in S. typhimurium is N-OAc-AF=O, with the same activation manner as AAF.