title: Carcinogenicity of 2,2'-dihydroxy-di-n-propylnitrosamine in the tree shrew (Tupaia glis): light and electron microscopic features of pulmonary adenomas.
abstract: The carcinogenic effect of 2,2'-dihydroxy-di-n-propylnitrosamine (DHPN) was examined in the primitive primate, tree shrew (Tupaia glis). DHPN was administered at a dose of 250 mg/kg body weight sc once a week for 80 weeks. Between 65 and 102 weeks, 8 of 9 males given DHPN (89%) and 11 of 14 females given DHPN (78%) developed pulmonary adenomas. In 2 DHPN-treated males, in addition to adenomas, bronchioalveolar carcinomas were observed. Transmission electron microscopic examination of pulmonary adenomas from 4 DHPN-treated animals showed that Clara cells were the main components of these tumors. In addition to pulmonary tumors, 9% of the DHPN-treated animals developed squamous cell carcinomas of the skin and hepatocellular carcinomas. None of the 6 controls, which received olive oil alone, developed any tumors.
mesh_terms: D000236:Adenoma / Q000139:chemically induced* / Q000473:pathology; D000818:Animals; D002273:Carcinogens; D006528:Carcinoma, Hepatocellular / Q000139:chemically induced; D002294:Carcinoma, Squamous Cell / Q000139:chemically induced; D005260:Female; D008113:Liver Neoplasms / Q000139:chemically induced; D008175:Lung Neoplasms / Q000139:chemically induced* / Q000473:pathology; D008297:Male; D008854:Microscopy, Electron; D009374:Neoplasms, Experimental / Q000139:chemically induced; D009602:Nitrosamines / Q000633:toxicity*; D012878:Skin Neoplasms / Q000139:chemically induced; D013997:Time Factors; D014418:Tupaiidae
chemical_list: D002273:Carcinogens; D009602:Nitrosamines; C012457:diisopropanolnitrosamine