A Very Low Dose of Green Tea Polyphenols in Drinking Water Prevents N-Methyl-N-nitrosourea-induced Colon Carcinogenesis in F344 Rats |
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Authors: | Tomio Narisawa Yoko Fukaura |
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Affiliation: | Akita University College of Allied Medical Science, Hondo 1-1-1, Akita 010 |
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Abstract: | The effect of tea polyphenols, major constituents of tea, on colon carcinogenesis was investigated. A total of 129 female F344 rats were given an intrarectal instillation of 2 mg of N-methyl-N-nitrosourea 3 times a week for 2 weeks, and received a water solution of green tea extract (GTE) as drinking water throughout the experiment. Autopsies at week 35 revealed significantly lower incidence of colon carcinomas in rats ingesting 0.05%, 0.01% or 0.002% GTE solution than in controls ingesting 0% GTE solution: 43%, 40% and 33% vs. 67%. The data suggest that GTE, even at a very low dose (0.002% solution), has a potent inhibitory effect on colon carcinogenesis. |
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Keywords: | Colon cancer Colon carcinogenesis Tea polyphenol Green tea Cancer chemoprevention |
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