title: Combined effect of human neutrophils, ceftazidime and granulocyte colony-stimulating factor on killing of Escherichia coli.
abstract: The combination effect of subinhibitory and inhibitory concentrations of ceftazidime, granulocyte colony-stimulating factor (G-CSF) and polymorphonuclear leukocytes (PMNL) against Escherichia coli was investigated. PMNL obtained from healthy volunteers were incubated with different concentrations of G-CSF and ceftazidime for 180 min. The addition of 0.25 x MIC of ceftazidime or 1 x MIC significantly enhanced the bactericidal activity of PMNL. G-CSF at a concentration of 6,000 units/ml led to only a slight improvement in the bactericidal activity of PMNL. The combination of 6,000 units/ml G-CSF and ceftazidime in inhibitory as well as subinhibitory concentrations, however, showed a significant synergistic effect (p < 0.01) on the antibacterial activity of PMNL during the entire incubation period. Combinations of G-CSF and antibiotics could therefore be beneficial for infected patients, especially those with impaired cellular host defence.
authors.affiliation: Department of Environmental Medicine, University Hospital Freiburg, Germany.
authors.forename: F D
authors.initials: FD
authors.lastname: Daschner
authors.forename: H
authors.initials: H
authors.lastname: Grundmann
authors.forename: K
authors.initials: K
authors.lastname: Anding
authors.forename: S
authors.initials: S
authors.lastname: Lemmen
mesh_terms: D000328:Adult; D002442:Ceftazidime / Q000494:pharmacology*; D002511:Cephalosporins / Q000494:pharmacology*; D004357:Drug Synergism; D004926:Escherichia coli / Q000187:drug effects*; D005260:Female; D016179:Granulocyte Colony-Stimulating Factor / Q000494:pharmacology*; D006801:Humans; D008297:Male; D008826:Microbial Sensitivity Tests; D009504:Neutrophils / Q000502:physiology*; D010587:Phagocytosis
chemical_list: D002511:Cephalosporins; D016179:Granulocyte Colony-Stimulating Factor; D002442:Ceftazidime