A novel heterocyclic
amine, 9-(4'-aminophenyl)-9H-pyrido[3,4-b]
indole (
aminophenylnorharman, APNH), which is formed from nonmutagenic 9H-pyrido[3,4-b]
indole (
norharman) and
aniline, is mutagenic to bacteria and mammalian cells and potently carcinogenic in rats. APNH is detected in human urine samples, suggesting that humans are continuously exposed to APNH. In the present study, (32)P-postlabelin analysis revealed that the levels of APNH-
DNA adduct 24 hr after the treatment with APNH (1, 5 and 20 mg/kg
body weight) in male ICR mice were increased in a dose-dependent manner in the colon and liver. Based on these findings, we determined the
tumor-initiating potency of APNH in an
inflammation-related and two-stage mouse colon
carcinogenesis model. Male Crj: CD-1 (ICR) mice were given a single intragastric administration (1, 2, 5 or 10 mg/kg
body weight) of APNH and subsequent 1-week oral exposure to
dextran sodium sulfate (DSS, 2% in
drinking water). Treatment with APNH and DSS resulted in numerous colon
tumor development: the incidence and multiplicity of the
tumors were the highest in the mice received 10 mg/kg
body weight of APNH and followed by DSS. Development of colon
tumors was dose-dependent of APNH. Seven of 9 (77.8%) colonic
adenocarcinomas developed in mice treated with APNH (10 mg/kg
body weight) and DSS had
beta-catenin gene mutations at
codons 32 and 37, being predominantly transversion. These findings indicate that APNH has an initiating activity in inflamed mouse colon and the APNH-
DNA adduct formation correlates with its tumorigenic potential.