title: Activation of intracisternal A particles in mouse liver by diethylnitrosamine.
abstract: Livers of 6- to 7-week-old male C3H/He, CBA, A, and BALB/c mice were examined by electron microscopy for the presence of intracisternal A particles (ICAP) after administration of diethylnitrosamine (DEN) in drinking water. In control mice, ICAP were extremely rare; they were found in the livers of only 2 mice (strains C3H/He and A; none in the other strains). By contrast, the treatment of mice with DEN greatly enhanced the appearance of ICAP in the liver cells of all strains. Within 2 weeks of the treatment, ICAP were found in 8-26% of liver cells examined in all mice and the number of ICAP/cell ranged from 3 to 12. Aside from mild disorganization of the rough endoplasmic reticulum, such as segmentation and vesiculation, liver cells of carcinogen-treated mice showed none of the consistent abnormalities that characterize the appearance of ICAP. The reactivation of ICAP (which are usually suppressed in adult mice) by DEN may become a useful marker for analysis of the sequential alterations of the liver that lead to the development of hepatoma during carcinogenesis.
mesh_terms: D000818:Animals; D004052:Diethylnitrosamine / Q000494:pharmacology*; D007181:Inclusion Bodies, Viral / Q000187:drug effects*; D008099:Liver / Q000187:drug effects / Q000382:microbiology*; D008297:Male; D051379:Mice; D008805:Mice, Inbred A; D008807:Mice, Inbred BALB C; D008809:Mice, Inbred C3H; D008808:Mice, Inbred CBA; D009602:Nitrosamines / Q000494:pharmacology*; D011230:Precancerous Conditions / Q000648:ultrastructure
chemical_list: D009602:Nitrosamines; D004052:Diethylnitrosamine