title: Penicillin-G degradation products inhibit in vitro granulopoiesis.
abstract: 38% of penicillin-G in solution decays at 20 degrees C within 24 h, 50% at 37 degrees C and 66% within 3 h at 56 degrees C. These degraded penicillin-G solutions strongly inhibit growth and maturation of granulocytic stem cells in vitro. Inhibitory concentrations are in the range obtainable with high dose penicillin therapy in vivo. No cytotoxicity of degraded penicillin solutions on bone marrow cells was seen over 24 h. It is suggested that penicillin-G degradation products are responsible for severe granulocytopenia observed after high dose penicillin-G therapy.
mesh_terms: D001853:Bone Marrow / Q000187:drug effects; D002478:Cells, Cultured; D004305:Dose-Response Relationship, Drug; D006098:Granulocytes; D006410:Hematopoiesis / Q000187:drug effects*; D006412:Hematopoietic Stem Cells / Q000187:drug effects; D006358:Hot Temperature; D006801:Humans; D010400:Penicillin G / Q000494:pharmacology*; D013997:Time Factors
chemical_list: D010400:Penicillin G