title: Induction of sister-chromatid exchange (SCE) and cell-cycle inhibition in mouse peripheral blood B lymphocytes exposed to mutagenic carcinogens in vivo.
abstract: To determine the sensitivity of the mouse peripheral blood lymphocyte (PBL) culture system, male B6C3f1 mice were injected i.p. with either 2-acetylaminofluorene (AAF) (20, 40, 80, 160 mg/kg), benzo[a]pyrene (BP) 25, 75, 150, 300 mg/kg), dichlorvos (DCV) (5, 15, 25, 35 mg/kg), ethyl methanesulfonate (EMS) (10, 30, 90, 180, 270 mg/kg), or N-nitrosomorpholine (NM) (37.5, 75, 150, 300 mg/kg) dissolved in either RPMI 1640 (DCV, EMS, NM) or sunflower oil (AAF, BP). 24 h later blood was removed by cardiac puncture, and the lymphocytes were cultured in the presence of lipopolysaccharide for analysis of SCE in B lymphocytes. All 4 mutagenic carcinogens (AAF, BP, EMS, NM) induced significant dose-related increases in SCE frequency. DCV, a potent neurotoxicant, caused no change in the baseline SCE frequency. At the highest concentration of each chemical examined, AAF caused a 1.6-fold increase, EMS a 1.8-fold increase, NM a 3.0-fold increase, and BP a 3.1-fold increase in SCE frequency compared to concurrent controls. A comparison of these results for PBLs with those reported in the literature for bone marrow cells indicates that PBLs offer a good quantitative and qualitative estimate of the SCE-inducing potential for these 5 compounds in bone marrow cells.
mesh_terms: D015073:2-Acetylaminofluorene / Q000633:toxicity; D000818:Animals; D001402:B-Lymphocytes / Q000187:drug effects*; D001564:Benzo(a)pyrene / Q000633:toxicity; D002273:Carcinogens / Q000633:toxicity*; D002453:Cell Cycle / Q000187:drug effects*; D002478:Cells, Cultured; D004006:Dichlorvos / Q000633:toxicity; D004305:Dose-Response Relationship, Drug; D005020:Ethyl Methanesulfonate / Q000633:toxicity; D008297:Male; D051379:Mice; D009152:Mutagenicity Tests; D009153:Mutagens / Q000633:toxicity*; D009602:Nitrosamines / Q000633:toxicity; D012854:Sister Chromatid Exchange / Q000187:drug effects*
chemical_list: D002273:Carcinogens; D009153:Mutagens; D009602:Nitrosamines; D001564:Benzo(a)pyrene; C002741:N-nitrosomorpholine; D004006:Dichlorvos; D005020:Ethyl Methanesulfonate; D015073:2-Acetylaminofluorene