title: Tumorigenicity and metabolism of 1-nitropyrene in A/J mice.
abstract: Four groups of 28-32 male and female A/J mice were given i.p. injections of either trioctanoin or 1-nitropyrene in trioctanoin such that the total doses of 1-nitropyrene were 0.71 mmol/kg, 2.14 mmol/kg, or 6.44 mmol/kg. The mean number of lung tumors/mouse was 1.3 +/- 1.0 in the group treated with 6.44 mmol/kg of 1-nitropyrene compared with 0.3 +/- 0.6 in the trioctanoin group (p less than 0.001). Combined tumor incidence was not significant compared with controls in the two lower dose groups. Cultured explants of A/J mouse lung, and 9000 g supernatant of A/J mouse lung and liver, metabolized [14C]1-nitropyrene to 4,5-dihydro-4,5-dihydroxy-1-nitropyrene and 1-nitrohydroxypyrenes. Substantial amounts of unknown polar metabolites were also produced by cultured lung. Nitro-reduction to 1-aminopyrene was minimal in mouse lung and liver, even under oxygen deficient conditions.
mesh_terms: D000818:Animals; D005260:Female; D066298:In Vitro Techniques; D008099:Liver / Q000378:metabolism; D008175:Lung Neoplasms / Q000139:chemically induced*; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D009153:Mutagens; D010084:Oxidation-Reduction; D011721:Pyrenes / Q000378:metabolism* / Q000633:toxicity
chemical_list: D009153:Mutagens; D011721:Pyrenes; C032668:1-nitropyrene