title: Effects of chrysotile asbestos on lung and pleural carcinogenesis of N-bis(2-hydroxypropyl)nitrosamine in rats.
abstract: The effects of chrysotile asbestos on lung and pleural carcinogenesis by N-bis(2-hydroxypropyl)nitrosamine (DHPN) in male Wistar rats were studied. Chrysotile, 30 mg per rat, was injected into the left pleural cavity and 3 g/kg body wt. DHPN was injected once into the abdominal cavity. Lung tumors (adenoma, adenocarcinoma, squamous cell carcinoma, and combined carcinoma) occurred at the highest incidence (100%). Adenocarcinoma was seen in 4 of 11 (36%) rats killed at 35 weeks and in 6 of 12 (50%) rats killed at 52 weeks, squamous cell carcinoma occurred in 1 of 11 (9%) rats killed at 35 weeks and 3 of 12 (25%) rats killed at 52 weeks, and mixed carcinoma was seen in 1 of 12 (8%) rats killed at 52 weeks, which received chrysotile and DHPN. Adenocarcinoma was seen in 9 of 11 (82%) rats which received DHPN only and killed at 52 weeks. Mesotheliomas were seen in 2 of 11 (18%) rats, killed at 35 weeks, and 3 of 12 (25%) rats, killed at 52 weeks, which received chrysotile and DHPN. Hyaline thickening of the pleura was seen in 100% of rats receiving chrysotile. Mesothelial cell hyperplasia and adenomatous and/or fibromatous growth of the mesothelium were seen in the pleura on both sides, ranging from 36% to 50% and 31% to 64% in rats receiving chrysotile and DHPN, respectively. Asbestos bodies were seen in the pleura on both sides and in the lung.
mesh_terms: D000818:Animals; D001194:Asbestos / Q000633:toxicity*; D017632:Asbestos, Serpentine; D002273:Carcinogens / Q000633:toxicity*; D004347:Drug Interactions; D008168:Lung / Q000187:drug effects / Q000473:pathology*; D008175:Lung Neoplasms / Q000139:chemically induced* / Q000473:pathology; D008297:Male; D009374:Neoplasms, Experimental / Q000473:pathology; D009602:Nitrosamines / Q000633:toxicity*; D010994:Pleura / Q000187:drug effects / Q000473:pathology*; D010997:Pleural Neoplasms / Q000139:chemically induced* / Q000473:pathology; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D017632:Asbestos, Serpentine; D002273:Carcinogens; D009602:Nitrosamines; D001194:Asbestos; C012457:diisopropanolnitrosamine