title: 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.
abstract: The effects of antioxidants on mammary gland carcinogenesis pretreated with 7,12-dimethylbenz[a]anthracene (DMBA) in female Sprague-Dawley rats were examined. The antioxidants used were butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT), sodium L-ascorbate, alpha-tocopherol, ethoxyquin and p,p'-diaminodiphenylmethane (DDPM), which is an inhibitor of carcinogenesis in the liver, kidney and urinary bladder. Female Sprague-Dawley rats of 50 days 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% alpha-tocopherol, 0.5% ethoxyquin or 0.1% DDPM for 33 weeks and then killed. The incidences of mammary tumors, carcinomas and fibroadenomas in DMBA-treated animals were reduced by diet containing BHA or ethoxyquin. Diet containing BHT or DDPM inhibited the induction of only fibroadenomas. The incidence of ear duct tumors in DMBA-treated animals was reduced by diet containing BHT, alpha-tocopherol or ethoxyquin.
mesh_terms: D015127:9,10-Dimethyl-1,2-benzanthracene; D000818:Animals; D000975:Antioxidants / Q000494:pharmacology*; D001205:Ascorbic Acid / Q000494:pharmacology; D001726:Bisacodyl / Q000031:analogs & derivatives / Q000494:pharmacology*; D002083:Butylated Hydroxyanisole / Q000494:pharmacology; D002084:Butylated Hydroxytoluene / Q000494:pharmacology; D002471:Cell Transformation, Neoplastic / Q000187:drug effects; D003408:Cresols / Q000494:pharmacology*; D004032:Diet; D004428:Ear Neoplasms / Q000139:chemically induced*; D005015:Ethoxyquin / Q000494:pharmacology; D005260:Female; D008325:Mammary Neoplasms, Experimental / Q000139:chemically induced*; D051381:Rats; D011919:Rats, Inbred Strains; D014810:Vitamin E / Q000494:pharmacology
chemical_list: D000975:Antioxidants; D003408:Cresols; D001726:Bisacodyl; D014810:Vitamin E; D002084:Butylated Hydroxytoluene; D002083:Butylated Hydroxyanisole; D015127:9,10-Dimethyl-1,2-benzanthracene; D005015:Ethoxyquin; D001205:Ascorbic Acid; C001659:dihydroxydiphenyl-pyridyl methane