Berry ellagitannins may not be sufficient for prevention of tumors in the rodent esophagus. J Agric Food Chem 2010 Apr 14;58(7):3992-5
Date
02/04/2010Pubmed ID
20121200Pubmed Central ID
PMC3070955DOI
10.1021/jf9030635Scopus ID
2-s2.0-77950652972 (requires institutional sign-in at Scopus site) 28 CitationsAbstract
Biodirected fractionation is used to identify the active inhibitory constituents in berries for esophageal cancer in rats. The present study was undertaken to determine if ellagitannins contribute to the chemopreventive activity of an alcohol/water-insoluble (residue) fraction of berries. Rats consumed diets containing residue fractions of three berry types, that is, black raspberries (BRBs), strawberries (STRWs), and blueberries (BBs), that differ in their content of ellagitannins in the order BRB > STRW > BB. Animals were fed residue diets beginning 2 weeks before treatment with the esophageal carcinogen N-nitrosomethylbenzylamine (NMBA) and throughout the 30-week bioassay. Residue fractions from all three berry types were about equally effective in reducing NMBA tumorigenesis in the rat esophagus irrespective of their ellagitannin content (0.01-0.62 g/kg of diet). These results suggest that the ellagitannins may not be responsible for the chemopreventive effects of the alcohol/water-insoluble fraction of berries.
Author List
Wang LS, Hecht S, Carmella S, Seguin C, Rocha C, Yu N, Stoner K, Chiu S, Stoner GMESH terms used to index this publication - Major topics in bold
AnimalsBlueberry Plants
Disease Models, Animal
Esophageal Neoplasms
Fruit
Humans
Hydrolyzable Tannins
Male
Plant Extracts
Random Allocation
Rats
Rats, Sprague-Dawley
Rosaceae
