Abstract
The potential modifying effect of retinyl acetate (RA) on butylated hydroxyanisole (BHA)‐induced rat forestomach tumorigenesis was examined. Male F344 rats, 5 weeks of age, were maintained on diet containing 1% or 2% BHA by weight and simultaneously on drinking water supplemented with RA at various concentrations (w/v) for 52 weeks. In groups given 2% BHA, although marked hyperplastic changes of the forestomach epithelium were observed in all animals, co‐administration of 0.25% RA significantly (P<0.05) increased the incidence of forestomach tumors (squamous cell papilloma and carcinoma) to 60% (9/15, 2 rats with carcinoma) from 15% (3/20, one rat with carcinoma) in the group given RA‐free water. In rats given 1% BHA, RA co‐administered at a dose of 0.05, 0.1, 0.2 or 0.25% showed a dose‐dependent enhancing effect on the development of the BHA‐induced epithelial hyperplasia. Tumors, all papillomas, were induced in 3 rats (17%) with 0.25% RA and in one rat (10%) with 0.05% RA co‐administration. RA alone did not induce hyperplastic changes in the forestomach. These findings indicate that RA acted as a co‐carcinogen in the BHA forestomach carcinogenesis of the rat.
Keywords: Butylated hydroxyanisole, Retinyl acetate, Co‐carcinogenicity, Forestomach, Rat
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References
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