Preventive effects of a flavonoid myricitrin on the formation of azoxymethane-induced premalignant lesions in colons of rats

Asian Pac J Cancer Prev. Jan-Mar 2007;8(1):73-6.


The preventive effect of dietary exposure to a flavonoid myricitrin of azoxymethane (AOM)-induced aberrant crypt foci (ACF) and beta-catenin-accumulated crypts (BCAC) formation was investigated in male F344 rats. Thirty-four rats were divided randomly into five experimental groups. Rats in groups 1-3 were given subcutaneous injections of AOM (15 mg/kg body weight) once a week for 3 weeks. Starting 1 week before the first injection of AOM, rats in groups 2 and 3 were fed a diet containing 500 or 1000 ppm myricitrin, respectively, for 11 weeks. Rats in group 4 were fed a diet containing 1000 ppm myricitrin. Rats in groups 1 and 5 were given the basal diet alone during the study. The experiment was terminated 11 weeks after the start. The frequency of ACF per colon in group 3 treated with AOM and 1000 ppm myricitrin was significantly lower than that in group 1 treated with AOM alone (p<0.01). Furthermore, dietary myricitrin at both doses (groups 2 and 3) significantly inhibited the formation of BCAC when compared to group 1 (p<0.05). These results indicate that myricitrin had possible chemopreventive effects in the present short-term colon carcinogenesis bioassays and suggest that longer exposure may cause suppression of tumor development.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Azoxymethane / toxicity*
  • Carcinogens / toxicity*
  • Cell Transformation, Neoplastic / drug effects*
  • Colonic Neoplasms / chemically induced
  • Colonic Neoplasms / pathology
  • Colonic Neoplasms / prevention & control*
  • Diet
  • Flavonoids / pharmacology*
  • Male
  • Precancerous Conditions / chemically induced
  • Precancerous Conditions / pathology
  • Precancerous Conditions / prevention & control*
  • Rats
  • Rats, Inbred F344
  • beta Catenin / pharmacology


  • Carcinogens
  • Flavonoids
  • beta Catenin
  • myricitrin
  • Azoxymethane