Açai (Euterpe oleracea Mart.) feeding attenuates dimethylhydrazine-induced rat colon carcinogenesis

Food Chem Toxicol. 2013 Aug;58:68-76. doi: 10.1016/j.fct.2013.04.011. Epub 2013 Apr 15.


This study investigated the protective effect of spray-dried açaí powder (AP) intake on colon carcinogenesis induced by 1,2-dimethylhydrazine (DMH) in male Wistar rats. After 4 weeks of DMH administrations, the groups were fed with standard diet, a diet containing 2.5% or 5.0% AP or a diet containing 0.2% N-acetylcysteine (NAC) for 10 weeks, using aberrant crypt foci (ACF) as the endpoint. Additionally, two groups were fed with standard diet or a diet containing 5.0% AP for 20 weeks, using colon tumors as the endpoint. In ACF assay, a reduction in the number of aberrant crypts (ACs) and ACF (1-3 AC) were observed in the groups fed with 5.0% AP (37% AC and 47% ACF inhibition, p=0.036) and 0.2% NAC (39% AC and 41% ACF inhibition, p=0.042). In tumor assay, a reduction in the number of invasive tumors (p<0.005) and tumor multiplicity (p=0.001) was observed in the group fed with 5.0% AP. Also, a reduction in tumor Ki-67 cell proliferation (p=0.003) and net growth index (p=0.001) was observed in the group fed with 5.0% AP. Therefore the findings of this study indicate that AP feeding may reduce the development of chemically-induced rat colon carcinogenesis.

Keywords: Aberrant crypt foci; Açaí pulp; Colon carcinogenesis; Spray-dry.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • 1,2-Dimethylhydrazine / toxicity*
  • Animals
  • Apoptosis
  • Arecaceae*
  • Carcinogenesis*
  • Carcinogens / toxicity*
  • Cell Proliferation
  • Colonic Neoplasms / chemically induced
  • Colonic Neoplasms / metabolism
  • Colonic Neoplasms / pathology
  • Colonic Neoplasms / prevention & control*
  • Connexin 43 / metabolism
  • Rats
  • beta Catenin / metabolism


  • Carcinogens
  • Connexin 43
  • beta Catenin
  • 1,2-Dimethylhydrazine