Lack of initiation activity in rat liver of low doses of 2-amino-3,8-dimethylimidazo[4,5-f]quinoxaline

Shoji Fukushima, Hideki Wanibuchi, Keiichirou Morimura, Min Wei, Dai Nakae, Yoichi Konishi, Hiroyuki Tsuda, Nobuo Takasuka, Katsumi Imaida, Tomoyuki Shirai, Masae Tatematsu, Tetsuya Tsukamoto, Masao Hirose, Fumio Furukawa

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)


It has been generally accepted that genotoxic carcinogens have no threshold in exerting their potential for cancer induction. However, the non-threshold theory can be challenged for cancer risk assessment in humans. Here we examined low dose carcinogenicity of a food-derived, genotoxic hepatocarcinogen, 2-amino-3,8-dimethylimidazo[4,5-f]quinoxaline (MeIQx), using an in vivo medium-term bioassay to detect initiating activity for rat hepatocarcinogenesis. With MeIQx initiation at various doses followed by administration of phenobarbital, a well known hepatopromoter, no induction of glutathione S-transferase placental form-positive foci, assessed as preneoplastic lesions, was noted at doses of 0.001-1 ppm. The results imply a no-observed effect level for hepatocarcinogenicity with this genotoxic agent.

Original languageEnglish
Pages (from-to)35-40
Number of pages6
JournalCancer Letters
Issue number1
Publication statusPublished - 28-02-2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Oncology
  • Cancer Research


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