title: Neoplastic effects of oral administration of (+/-)-trans-7,8-dihydroxy-7,8-dihydrobenzo[a]pyrene and their inhibition by butylated hydroxyanisole.
abstract: The neoplastic effects of administration of benzo[a]pyrene (BP) and (+/-)-trans-7,8-dihydroxy-7,8-dihydrobenzo[a]pyrene (BP 7,8-dihydrodiol) by oral intubation to noninbred female Ha:ICR mice have been determined. Under the experimental conditions, BP induced papillomas of the forestomach. BP 7,8-dihydrodiol also induced papillomas of the forestomach and was more potent than BP. In addition, administration of BP 7,8-dihydrodiol caused a large number of pulmonary adenomas and lymphomas. Butylated hydroxyanisole (BHA) added to the diet at a concentration of 5 mg/g inhibited BP-induced neoplasia of the forestomach. BHA also inhibited neoplasia of the forestomach, lungs, and lymphoid tissues that was caused by administration of BP 7,8-dihydrodiol. These data suggest that the inhibitory effect of BHA on BP carcinogenesis may entail events that occur subsequent to the formation of BP 7,8-dihydrodiol.
mesh_terms: D000236:Adenoma / Q000139:chemically induced; D000818:Animals; D000840:Anisoles / Q000494:pharmacology*; D001580:Benzopyrenes / Q000378:metabolism / Q000633:toxicity*; D001711:Biotransformation / Q000187:drug effects; D002083:Butylated Hydroxyanisole / Q000494:pharmacology*; D005260:Female; D008175:Lung Neoplasms / Q000139:chemically induced; D008223:Lymphoma / Q000139:chemically induced; D051379:Mice; D009374:Neoplasms, Experimental / Q000139:chemically induced* / Q000517:prevention & control; D010212:Papilloma / Q000139:chemically induced; D013274:Stomach Neoplasms / Q000139:chemically induced
chemical_list: D000840:Anisoles; D001580:Benzopyrenes; D002083:Butylated Hydroxyanisole