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Infect. Immun., 05 1996, 1577-1581, Vol 64, No. 5
W Wiktor-Jedrzejczak, B Dzwigala, M Szperl, M Maruszynski, E Urbanowska and P Szwech
Osteopetrotic op/op mice have less than 5% of the normal number of
macrophages in the peritoneal cavity (W. Wiktor-Jedrzejczak, A. Ahmed, C.
Szczylik, and R.R. Skelly, J. Exp. Med. 156:1516-1527, 1982). Fecal
peritonitis was induced by intraperitoneal injection of 0.5 ml of 5%
autoclaved feces in saline along with Escherichia coli grown from feces of
mice of the same colony and added in doses ranging between 10 and 10(6)
CFU. Such infection led to a septic shock and either was lethal within 24 h
or became cured without additional treatment of the mice. The op/op mice
survived administration of 30-times-smaller doses of bacteria compared with
their normal littermates. Analysis of the kinetics of cellular changes in
the peritoneal cavity associated with such infection revealed that this
increased susceptibility of macrophage-deficient mice cannot be explained
by a direct role of macrophages in combating the infection. Instead, it
appeared that the increased susceptibility to fatal fecal peritonitis was
most likely due to delayed and impaired recruitment of neutrophils to the
site of infection in mutant mice. The increased susceptibility of the op/op
mice to E. coli fecal peritonitis was not due to their possible increased
sensitivity to endotoxin, since the mutant mice tolerated
lipopolysaccharide doses more than twice those tolerated by control
littermates. On the other hand, their susceptibility to exogenous tumor
necrosis factor alpha and interleukin-1 alpha was increased. Both mutant
op/op and control mice were able to survive secondary challenge with 10(6)
E. coli (administered along with feces) lethal for both types of mice on
primary challenge. These data suggest that colony- stimulating factor
1-dependent resident peritoneal macrophages play a role in controlling
primary infection by recruiting neutrophils and are not required for
efficient response to secondary infection.
Copyright © 1996, American Society for Microbiology
Colony-stimulating factor 1-dependent resident macrophages play a regulatory role in fighting Escherichia coli fecal peritonitis
Department of Immunology, Central Clinical Hospital, Military School of Medicine, Warsaw, Poland.
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