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. 1988 Jun;56(6):1492–1499. doi: 10.1128/iai.56.6.1492-1499.1988

In vivo-activated mononuclear phagocytes and protective immunity to chlamydiae in mice.

R E Huebner 1, G I Byrne 1
PMCID: PMC259426  PMID: 3131246

Abstract

Peritoneal macrophages (M phi s) collected from Chlamydia psittaci 6BC-immune mice after intraperitoneal challenge with 10(6) 6BC (immune-boosted [IB] M phi s) were compared by various functional criteria with other in vivo- and in vitro-activated M phi populations. While casein-, protease peptone-, and thioglycolate (Thio)-elicited M phi s were equally susceptible to in vitro infection with 6BC, IB M phi s did not support chlamydial growth and M phi s from Mycobacterium tuberculosis BCG- or Listeria monocytogenes-sensitized mice exhibited intermediate susceptibility to infection. The resistance of IB M phi s was not due to the ingestion of fewer 6BC organisms, nor were these cells persistently infected, since chlamydiae could not be recovered from infected IB M phi s after in vitro infection, even after extended incubation times. In contrast, Thio M phi s stimulated in vitro with gamma interferon (IFN-gamma), with or without lipopolysaccharide, resulted in cells that exhibited chlamydiastatic activity which was lost shortly after IFN-gamma was removed from the culture medium. Conversely, the antichlamydial activity of IB M phi s was stable over time but not through the production of autostimulatory cytokines, as evidenced by the lack of stimulation of Thio M phi s to restrict 6BC replication in coculture experiments. IB M phi s exhibited enhanced oxidative activity, but anti-IFN-gamma antibody did not abrogate this response. IB M phi s were recovered only from immunized mice that survived an otherwise lethal 6BC intraperitoneal challenge. These cells appear to be important for development of protective immunity to chlamydiae, and evidence suggests that stimulation by cytokines other than IFN-gamma (with or without lipopolysaccharide) is required for the observed heightened in vivo activation.

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Selected References

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