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The effect of recombinant human granulocyte colony-stimulating factor (rhG-CSF) in a murine model of pneumococcal pneumonia was examined. Intranasal inoculations were 10(7) cfu/mouse (high inoculum) and 5 x 10(4) cfu/mouse (low inoculum) of Streptococcus pneumoniae, which induced severe or mild lung inflammation, respectively. With the low inoculum, rhG-CSF significantly improved survival when initiated 24 h or 10 min before, but not when initiated 24 h after, infection. Pretreatment with rhG-CSF significantly increased myeloperoxidase (MPO) activity in lungs 8 h after the infection and increased circulating neutrophil count 24, 48, and 72 h after infection. In contrast, rhG-CSF did not improve survival of animals infected with the high inoculum and did not increase MPO activity or neutrophil count in blood over those of sham-treated controls. These data strongly suggest that the severe inflammatory response typically observed in pneumococcal pneumonia recruits a maximum number of neutrophils in the lungs and thus masks the beneficial effect of rhG-CSF.

the journal of infectious diseases (online. university of chicago press)/the journal of infectious diseases

Efficacy of Recombinant Human Granulocyte Colony‐Stimulating Factor in a Murine Model of Pneumococcal Pneumonia: Effects of Lung Inflammation and Timing of Treatment