title: Heinz bodies, methemoglobinemia, and hemolytic anemia induced in rats by 3-amino-1-[m-(trifluoromethyl)phenyl]-2-pyrazoline.
abstract: Sprague-Dawley CD strain rats were given 18, 35, 70, or 140 mg/kg/day of 3-amino-1-[m-(trifluoromethyl)phenyl]-2-pyrazoline by gavage for 2 weeks. Heinz bodies were seen in the erythrocytes of rats given 140 mg/kg/day. Dose-related increases in methemoglobin were found at 35 mg/kg/day or more. Hemolytic anemia was characterized by dose-related decreases in hematocrit, hemoglobin, and total erythrocyte count. Reticulocytosis, decreased myeloid:erythroid ratio, splenomegaly, extramedullary hematopoiesis, increased serum total bilirubin, and icterus were also observed. This compound was found to oxidize oxyhemoglobin to methemoglobin in vitro, suggesting that the parent compound is capable of causing the hematological changes observed in vivo without conversion to active metabolites.
mesh_terms: D015772:4,5-Dihydro-1-(3-(trifluoromethyl)phenyl)-1H-pyrazol-3-amine; D000743:Anemia, Hemolytic / Q000139:chemically induced*; D000818:Animals; D001835:Body Weight / Q000187:drug effects; D004906:Erythrocyte Count; D005260:Female; D006366:Heinz Bodies / Q000187:drug effects*; D006400:Hematocrit; D006454:Hemoglobins / Q000378:metabolism; D008297:Male; D008708:Methemoglobinemia / Q000139:chemically induced*; D010084:Oxidation-Reduction; D011720:Pyrazoles / Q000633:toxicity*; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D006454:Hemoglobins; D011720:Pyrazoles; D015772:4,5-Dihydro-1-(3-(trifluoromethyl)phenyl)-1H-pyrazol-3-amine