title: Tumor initiating activities of 1-nitropyrene and its nitrated products in SENCAR mice.
abstract: The environmental mutagens, 1-nitropyrene, 1,3-dinitropyrene, 1,6-dinitropyrene and 1,8-dinitropyrene were evaluated for their ability to initiate skin tumors in male and female SENCAR mice. 1-Nitropyrene (greater than 99.5% purity) did not induce papilloma formation over a dose range of 0-3.0 mg/mouse after 30 weeks of promotion with 12-O-tetradecanoylphorbol-13-acetate (TPA). Systemic administration of 1-nitropyrene by i.p. injection over a dose range of 0-8.0 mg/mouse followed by topical treatment with TPA also did not induce papilloma formation. A mixture of dinitropyrenes (1,3-dinitropyrene, 1,6-dinitropyrene and 1,8-dinitropyrene (1:1.94:1.95] (99% purity) was dermally applied to SENCAR mice over a dose range of 0-2.0 mg/mouse and the mice subsequently promoted with TPA. A significant induction of papillomas was observed at 30 weeks (0.37-0.39 papillomas/mouse, 26-29% of the mice bearing tumors) at 2.0 mg/mouse. Comparison of this data with that obtained from the same mouse strain using diesel exhaust particulate extracts containing 1-nitropyrene and its nitrated products indicate that these nitrated polynuclear aromatics do not significantly contribute to the mouse skin tumorigenic activity of diesel exhaust particulate extracts.
mesh_terms: D000287:Administration, Topical; D000818:Animals; D005260:Female; D007274:Injections, Intraperitoneal; D008297:Male; D051379:Mice; D009153:Mutagens; D010212:Papilloma / Q000139:chemically induced*; D011721:Pyrenes / Q000633:toxicity*; D012878:Skin Neoplasms / Q000139:chemically induced*
chemical_list: D009153:Mutagens; D011721:Pyrenes; C033310:1,8-dinitropyrene; C033309:1,6-dinitropyrene; C037413:1,3-dinitropyrene; C032668:1-nitropyrene