Modification by antioxidants and p, p'-diaminodiphenylmethane of 7, 12-dimethylbenz[a]anthracene-induced carcinogenesis of the mammary gland and ear duct in CD rats |
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Authors: | Hirose Masao; Masuda Atsuko; Inoue Tadashi; Fukushima Shoji; Ito Nobuyuki |
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Institution: | First Department of Pathology, Nagoya City University Medical School 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya 467, Japan |
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Abstract: | The effects of antioxidants on mammary gland carcinogenesispretreated with 7, 12-dimethylbenza]anthracene (DMBA) in femaleSprague-Dawley rats were examined. The antioxidants used werebutylated hydroxyanisole (BHA), butylated hydr-oxytoluene (BHT),sodium L-ascorbate, -tocopherol, ethoxy-uin and p, p-diaminodiphenylmethane(DDPM), which is an inhibitor of carcinogenesis in the liver,kidney and urinary bladder. Female Sprague-Dawley rats of 50days old were treated with 2.5 mg/100 g body weight of DMBA,and from 1 week later were given diet supplemented with 1% BHA,0.7% BHT, 5% sodium L-ascorbate, 1.5% -tocopherol, 0.5% ethoxyquinor 0.1% DDPM for 33 weeks and then killed. The incidences ofmammary tumors, carcinomas and fibroaden-omas in DMBA-treatedanimals were reduced by diet containing BHA or ethoxyquin. Dietcontaining BHT or DDPM inhibited the induction of only fibroadenomas.The incidence of ear duct tumors in DMBA-treated animals wasreduced by diet containing BHT, -tocopherol or ethoxyquin. |
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