Lack of elevated liver carcinogenicity of aminophenylnorharman in p53-deficient mice

Cancer Lett. 2005 Jan 20;217(2):149-59. doi: 10.1016/j.canlet.2004.07.015.

Abstract

The hepatocarcinogenic potential of 9-(4'-aminophenyl)-9H-pyrido[3,4-b]indole (aminophenylnorharman, APNH) was investigated using male and female p53 deficient mice. Incidence of oval cell hyperplasia was 2/14 (14.3%), 14/23 (60.9%), and 2/10 (20%) in p53 nullizygous (-/-), heterozygous (+/-), and wild type (+/+) mice, respectively, exposed to 30 ppm APNH for 15 weeks, while hepatocellular anisonucleosis was observed only in APNH-treated p53 (-/-) mice. At 40 weeks, hepatocellular carcinomas had developed in 16/46 (34.8%) and 10/27 (37.0%) of female p53 (+/-) and (+/+) mice in contrast to only 1/45 (2.2%) and 2/12 (16.7%) in their male counterparts, respectively, without any detectable p53 gene mutations. Dose-dependent APNH-DNA adduct formation and transcriptional induction of CYP 1A1, but not CYP 1A2, was revealed with 7-day APNH treatment using female C57BL/6J mice. These results suggested hepatocarcinogenicity of APNH in mice could be linked to the liver microenvironment including hormonal milieu but independent of p53 expression and p53 gene mutations.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Cytochrome P-450 CYP1A1 / drug effects
  • DNA Adducts / drug effects
  • Dose-Response Relationship, Drug
  • Female
  • Indoles / toxicity*
  • Liver Neoplasms, Experimental / chemically induced*
  • Liver Neoplasms, Experimental / genetics
  • Liver Neoplasms, Experimental / pathology
  • Male
  • Mice
  • Polymerase Chain Reaction
  • Polymorphism, Single-Stranded Conformational
  • Pyridines / toxicity*
  • Tumor Suppressor Protein p53 / deficiency*
  • Tumor Suppressor Protein p53 / genetics

Substances

  • DNA Adducts
  • Indoles
  • Pyridines
  • Tumor Suppressor Protein p53
  • Cytochrome P-450 CYP1A1
  • 9-(4'-aminophenyl)-9H-pyrido(3,4-b)indole