title: The effects of ellagic acid and 13-cis-retinoic acid on N-nitrosobenzylmethylamine-induced esophageal tumorigenesis in rats.
abstract: Ellagic acid (EA) and 13-cis-retinoic acid (CRA), both alone and in combination, were tested for their ability to inhibit N-nitrosobenzylmethylamine-induced tumors in the rat esophagus. Groups of male rats were fed AIN-76A diet containing EA (4 g/kg), CRA (240 mg/kg), or a combination of EA and CRA (4 g/kg and 240 mg/kg), respectively, for 25 weeks. Two weeks after initiation of the diets, NBMA (0.5 mg/kg per injection) was administered s.c. once weekly for 15 weeks. After 25 weeks on the diets, the animals were necropsied. The incidence of esophageal tumors was 97-100% in all NBMA-treated groups. The multiplicity of tumors in NBMA-treated groups was reduced significantly by EA (60%), but not by CRA, or by EA + CRA. These results demonstrate that EA and CRA do not act synergistically to inhibit NBMA-induced esophageal tumorigenesis.
authors.affiliation: Department of Pathology, Medical College of Ohio, Toledo 43699.
authors.forename: E M
authors.initials: EM
authors.lastname: Daniel
authors.forename: G D
authors.initials: GD
authors.lastname: Stoner
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents; D001835:Body Weight / Q000187:drug effects; D002273:Carcinogens; D004032:Diet; D004128:Dimethylnitrosamine / Q000031:analogs & derivatives*; D004357:Drug Synergism; D004610:Ellagic Acid / Q000008:administration & dosage / Q000627:therapeutic use*; D004938:Esophageal Neoplasms / Q000139:chemically induced / Q000473:pathology / Q000517:prevention & control*; D008297:Male; D051381:Rats; D011916:Rats, Inbred F344; D014212:Tretinoin / Q000008:administration & dosage / Q000627:therapeutic use*
chemical_list: D000970:Antineoplastic Agents; D002273:Carcinogens; D004610:Ellagic Acid; D014212:Tretinoin; C014707:nitrosobenzylmethylamine; D004128:Dimethylnitrosamine