Abstract
The effects of palm carotene on chemical carcinogenesis was studied. Palm carotene suppressed mouse epidermal ornithine decarboxylase activity induced by glycocholic acid. In a two-stage mouse epidermal carcinogenesis experiment using 7,12-dimethylbenz(a)anthracene as the initiator, glycocholic acid as the 1st stage promoter, and mezerein as the 2nd stage promoter, palm carotene inhibited the promoting activity of glycocholic acid. Furthermore, in N-ethyl-N'-nitro-N-nitrosoguanidine-induced mouse duodenal carcinogenesis, 0.05% of palm carotene given in drinking water decreased the percentage of tumor-bearing mice significantly.
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