title: Effect of cefazolin and vancomycin on osteoblasts in vitro.
abstract: The effect of cefazolin and vancomycin on osteoblast-like cells was studied. Cells from the MG-63 human osteosarcoma cell line were grown in antibiotic free media and exposed to concentrations of cefazolin and vancomycin at order of magnitude intervals between 0 and 10,000 microg/ml. For cefazolin, a second interval was performed between 100 and 1000 microg/ml to define toxic levels more accurately. Cell number and 3H-thymidine incorporation at 0, 24, and 72 hours were determined. The results of this study show that local levels of vancomycin of 1000 microg/ml and less have little or no effect on osteoblast replication, and concentrations of 10,000 microg/ml cause cell death. Concentrations of cefazolin of 100 microg/ml and less have little or no effect on osteoblast replication, 200 microg/ml significantly decrease cell replication, and 10,000 microg/ml cause cell death. The authors conclude that vancomycin is less toxic than is cefazolin to osteoblasts at higher concentrations and may be a better antibiotic for local administration in the treatment of similarly sensitive bacterial infections.
authors.affiliation: University of North Carolina School of Medicine, Division of Orthopaedic Surgery, Chapel Hill, USA.
authors.forename: M L
authors.initials: ML
authors.lastname: Edin
authors.forename: T
authors.initials: T
authors.lastname: Miclau
authors.forename: G E
authors.initials: GE
authors.lastname: Lester
authors.forename: R W
authors.initials: RW
authors.lastname: Lindsey
authors.forename: L E
authors.initials: LE
authors.lastname: Dahners
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D002437:Cefazolin / Q000494:pharmacology*; D016923:Cell Death / Q000187:drug effects; D002455:Cell Division / Q000187:drug effects; D002511:Cephalosporins / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D006801:Humans; D010006:Osteoblasts / Q000187:drug effects*; D014407:Tumor Cells, Cultured / Q000187:drug effects; D014640:Vancomycin / Q000494:pharmacology*
chemical_list: D000900:Anti-Bacterial Agents; D002511:Cephalosporins; D014640:Vancomycin; D002437:Cefazolin