title: Chronic toxicity of 1,3,5-trinitrobenzene in Fischer 344 rats.
abstract: The chronic toxicity of 1,3,5-trinitrobenzene (TNB) in male and female Fischer 344 (F344) rats was evaluated by feeding a diet containing 0, 5, 60, and 300 ppm of TNB for 2 years. The calculated average TNB intake over 2 years for males and females was 0.22, 2.64, 13.44 and 0.23, 2.68, 13.31 mg/kg body weight (BW)/day respectively. Terminal body weights were decreased and water intake was increased in both sexes (300 ppm), whereas food consumption was decreased in males (60 and 300 ppm groups) only. The relative spleen weights were significantly decreased in both sexes (300 ppm), whereas the relative brain weights were increased in females only (300 ppm). Hematological effects were not observed in animals killed at the 2-year time point, except significant decrease in the mean corpuscular hemoglobin (MCH) in males (300 ppm) and in females (60 and 300 ppm). Methemoglobin levels were increased in both sexes in the high dose group. Histopathological examination showed treatment-related changes in the kidney (hyaline droplets; 60 and 300 ppm) and the spleen (erythroid cell hyperplasia and pigment deposition; 300 ppm) of both sexes. Cytoplasmic hyaline droplets in the kidneys were characterized by immunohistochemistry as alpha-2mu-globulin. We propose a chronic, oral no-observable-adverse-effect level (NOAEL) of 2.68 mg/kg BW/day for TNB in the rat, based on the hematological and renal changes.
authors.affiliation: National Exposure Laboratory, U.S. Environmental Protection Agency, Cincinnati, Ohio, USA.
authors.forename: T V
authors.initials: TV
authors.lastname: Reddy
authors.forename: G R
authors.initials: GR
authors.lastname: Olson
authors.forename: B
authors.initials: B
authors.lastname: Wiechman
authors.forename: G
authors.initials: G
authors.lastname: Reddy
authors.forename: J A
authors.initials: JA
authors.lastname: Torsella
authors.forename: F B
authors.initials: FB
authors.lastname: Daniel
authors.forename: G J
authors.initials: GJ
authors.lastname: Leach
mesh_terms: D000284:Administration, Oral; D000510:Alpha-Globulins; D000818:Animals; D001835:Body Weight / Q000187:drug effects; D001921:Brain / Q000187:drug effects / Q000473:pathology; D004032:Diet; D004305:Dose-Response Relationship, Drug; D004326:Drinking / Q000187:drug effects; D004435:Eating / Q000187:drug effects; D004909:Erythrocyte Indices / Q000187:drug effects; D005260:Female; D007672:Kidney Cortex / Q000187:drug effects / Q000473:pathology; D008297:Male; D008706:Methemoglobin / Q000187:drug effects; D019055:No-Observed-Adverse-Effect Level; D009929:Organ Size / Q000187:drug effects; D051381:Rats; D011916:Rats, Inbred F344; D013154:Spleen / Q000187:drug effects / Q000473:pathology; D014301:Trinitrobenzenes / Q000008:administration & dosage / Q000633:toxicity*; D014874:Water Pollutants, Chemical / Q000008:administration & dosage / Q000633:toxicity*
chemical_list: D000510:Alpha-Globulins; D014301:Trinitrobenzenes; D014874:Water Pollutants, Chemical; C013803:alpha 2u globulin; C029222:sym-trinitrobenzene; D008706:Methemoglobin