Attenuation of the Bacterial Load in Blood by Pretreatment with Granulocyte-Colony-Stimulating Factor Protects Rats from Fatal Outcome and Brain Damage during Streptococcus pneumoniae Meningitis

Author:

Brandt Christian T.1,Lundgren Jens D.23,Lund Søren Peter4,Frimodt-Møller Niels1,Christensen Thomas5,Benfield Thomas3,Espersen Frank1,Hougaard David M.1,Østergaard Christian1

Affiliation:

1. Division of Microbiology, Statens Serum Institut

2. CHIP

3. National Institute of Occupational Health

4. Department of Infectious Diseases, Copenhagen University Hospital Hvidovre

5. Laboratory of Neuropathology, University of Copenhagen, Copenhagen, Denmark

Abstract

ABSTRACT A model of pneumococcal meningitis in young adult rats receiving antibiotics once the infection was established was developed. The intent was to mimic clinical and histopathological features of pneumococcal meningitis in humans. The primary aim of the present study was to evaluate whether medical boosting of the peripheral neutrophil count affected the outcome of the meningitis. The risk of terminal illness over the first 7 days after infection was significantly reduced for rats who had elevated peripheral white blood cell counts after receiving granulocyte-colony-stimulating factor (G-CSF) prior to the infection compared to that for untreated rats ( P = 0.039 by the log rank test). The improved outcome was associated with reduced signs of cerebral cortical damage ( P = 0.008). Furthermore, the beneficial effects of G-CSF were associated with reduced bacterial loads in the cerebrospinal fluid (median, 1.1 × 10 5 versus 2.9 × 10 5 CFU/ml; P = 0.023) and in blood (median, 2.9 × 10 2 versus 6.3 × 10 2 CFU/ml; P = 0.024), as well as attenuated pleocytosis (median, 800 × 10 6 versus 1,231 × 10 6 cells/liter; P = 0.025), 24 h after the infection. Conversely, initiation of G-CSF therapy 28 h postinfection did not alter the clinical or histological outcome relative to that for non-G-CSF-treated rats. The magnitude of bacteremia and pretreatment with G-CSF were found to be prognostic factors for both outcome and brain damage. In summary, elevated neutrophil levels prior to the development of meningitis result in reduced risks of death and brain damage. This beneficial effect is most likely achieved through improved control of the systemic disease.

Publisher

American Society for Microbiology

Subject

Infectious Diseases,Immunology,Microbiology,Parasitology

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