title: Induction of squamous cell carcinoma in the rat lung by 1,6-dinitropyrene.
abstract: The carcinogenicity of 1-nitropyrene [(1-NP) CAS: 5522-43-0] and 1,6-dinitropyrene [(1,6-DNP) CAS: 42397-64-8] was examined by their direct injection in a beeswax-tricaprylin vehicle into the lung of male F344/DuCrj rats. Of 28 rats given 0.15 mg of 1,6-DNP, 21 (75%) developed squamous cell carcinomas, 2 (7%) developed undifferentiated carcinomas, and 2 (7%) had squamous metaplasias in the lung by 72 weeks. In 32 rats that received 1.5 mg of 1-NP, neither carcinoma nor squamous metaplasia was induced. In all 19 rats (100%) given 0.5 mg of 3-methylcholanthrene [(MCA) CAS: 56-49-5], squamous cell carcinomas were induced earlier than in rats treated with 1,6-DNP. In 1 of 31 rats (3%) given the beeswax-tricaprylin vehicle only, squamous metaplasia was induced. Distant metastases of induced tumors were observed in 4 rats treated with 1,6-DNP and in 1 rat receiving MCA. Two lung tumors induced by 1,6-DNP were successively transplanted into the same strain of rats for 3 generations.
authors.forename: T
authors.initials: T
authors.lastname: Maeda
authors.forename: K
authors.initials: K
authors.lastname: Izumi
authors.forename: H
authors.initials: H
authors.lastname: Otsuka
authors.forename: Y
authors.initials: Y
authors.lastname: Manabe
authors.forename: T
authors.initials: T
authors.lastname: Kinouchi
authors.forename: Y
authors.initials: Y
authors.lastname: Ohnishi
mesh_terms: D000818:Animals; D002273:Carcinogens; D002294:Carcinoma, Squamous Cell / Q000139:chemically induced* / Q000473:pathology; D007680:Kidney Neoplasms / Q000556:secondary; D008175:Lung Neoplasms / Q000139:chemically induced* / Q000473:pathology; D008297:Male; D008748:Methylcholanthrene; D011721:Pyrenes / Q000633:toxicity*; D051381:Rats; D011916:Rats, Inbred F344
chemical_list: D002273:Carcinogens; D011721:Pyrenes; D008748:Methylcholanthrene; C033309:1,6-dinitropyrene; C032668:1-nitropyrene