Protective effects of lactoferrin in Escherichia coli-induced bacteremia in mice: relationship to reduced serum TNF alpha level and increased turnover of neutrophils

Inflammation Research : Official Journal of the European Histamine Research Society ... [et Al.]
M ZimeckiMarian L Kruzel

Abstract

Previous studies demonstrated that lactoferrin (LF), given intravenously (i.v.), 24 h before lethal Escherichia coli ( E. coli) infection, protects mice against mortality. The aim of this investigation was to determine whether downregulation of serum TNF alpha activity and increase of neutrophil number in the circulation and bone marrow by LF could contribute to the protective action of LF against E. coli-induced sepsis. CBA female mice, 10-12 week old, weight 20-22 g, were used. Mice were given 10 mg LF i.v. either 2 h or 24 h before i.v. administration of lethal dose of E. coli (5 x 10(8)). Serum activities of TNF alpha and IL-1 were determined by bioassays 2 h following E. coli or LF injection. The blood and bone marrow smears were stained with Giemsa and May-Grünwald reagents and reviewed histologically. LF given 24 h before E. coli caused a 60% reduction of TNF alpha released into circulation. However, pretreatment of mice with LF 2 h before bacterial challenge resulted in strong (15 fold) increase of TNF alpha serum level. Analysis of bone marrow cell composition revealed a significant increase in neutrophil lineage cell content (myelocytes, bands and mature neutrophils) following 24 h pretreatment with LF (51.8% of the t...Continue Reading

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