title: Hematologic effects of a single dose of methylnitrosourea.
abstract: The hematological effects of a single dose of 50 mg/kg Methylnitrosourea (MNU),administered i.v. to CBA/J mice, are described. Special emphasis was given to the number of pluripotent (CFUS) and granulocytic committed (CFUc) stem cells found in the bone marrow and spleen. In the peripheral blood a decreased number of reticulocytes, granulocytes, lymphocytes and thrombocytes was seen. This was followed by a rapid return of reticulocytes and a very slow return of thrombocytes. The bone marrow cellularity was below normal for at least 2 weeks with a markedly reduced number of lymphocytes. A rapid decrease in bone marrow and splenic CFUS and CFUc to 20-50% of control values was observed within 3 hours in mice injected with MNU. Seven days after MNU treatment, CFUS was about 10% of normal in both tissues. Contrary to this, CFUc had undergone significant regeneration. After 3 weeks CFUS returned to normal levels. At no stage could colony stimulating activity be detected in the serum.
mesh_terms: D000818:Animals; D001772:Blood Cell Count; D001792:Blood Platelets / Q000187:drug effects; D001853:Bone Marrow / Q000187:drug effects; D001854:Bone Marrow Cells; D002455:Cell Division / Q000187:drug effects; D005260:Female; D006098:Granulocytes / Q000187:drug effects; D006410:Hematopoiesis / Q000187:drug effects*; D006412:Hematopoietic Stem Cells / Q000187:drug effects; D006413:Hematopoietic System / Q000187:drug effects*; D007275:Injections, Intravenous; D008214:Lymphocytes / Q000187:drug effects; D008770:Methylnitrosourea / Q000008:administration & dosage / Q000633:toxicity*; D051379:Mice; D008808:Mice, Inbred CBA; D009607:Nitrosourea Compounds / Q000633:toxicity*; D012156:Reticulocytes / Q000187:drug effects; D013154:Spleen / Q000166:cytology / Q000187:drug effects
chemical_list: D009607:Nitrosourea Compounds; D008770:Methylnitrosourea