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Inhibition of Benzo(a)pyrene-induced Mouse Forestomach Neoplasia by Dietary Soy Sauce¹

Department of Food Microbiology and Toxicology, University of Wisconsin, Madison, Wisconsin 53706

We show that Japanese-style fermented soy sauce (shoyu) contains anticarcinogenic activity. Female ICR mice were fed a semipurified diet containing soy sauce (0–30%). Two weeks later a regimen consisting of 4 doses of benzo(a)pyrene (1 dose/week p.o. for 4 weeks) was begun to initiate forestomach neoplasia. Twenty-three weeks after the first intubation the animals were sacrificed, and forestomach neoplasms were counted and histologically confirmed. Soy sauce produced a significant dose-dependent reduction in forestomach neoplasms, which appeared to be maximal when soy sauce constituted 20% of the diet. Exposure to nitrite (0–500 ppm through drinking water) neither enhanced nor diminished the anticarcinogenic effect of the dietary soy sauce. Soy sauce was found to contain antioxidant activity which may be related to the observed anticarcinogenic effect. Contrary to expectations, mouse forestomach ornithine decarboxylase activity was induced by soy sauce. This appeared to be due at least in part to the relatively high sodium chloride content of soy sauce.

¹ This work was supported in part by the College of Agricultural and Life Sciences, University of Wisconsin, Madison; a grant from the Kikkoman Corporation; and gift funds administered through the Food Research Institute, University of Wisconsin, Madison.

² To whom requests for reprints should be addressed, at Department of Food Microbiology and Toxicology, University of Wisconsin, 1925 Willow Drive, Madison, WI 53706.

Received 11/15/90. Accepted 3/18/91.

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