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. 1990 Oct;58(10):3307–3311. doi: 10.1128/iai.58.10.3307-3311.1990

Ingestion of Legionella micdadei inhibits human neutrophil function.

G R Donowitz 1, I Reardon 1, J Dowling 1, L Rubin 1, D Focht 1
PMCID: PMC313654  PMID: 2169462

Abstract

Legionella micdadei is a human pathogen which survives within leukocytes. To determine how this organism escapes intracellular destruction, we examined its effect on human neutrophil activity. Neutrophils were allowed to ingest L. micdadei prior to evaluation of functional activity. Compared with control cells which did not ingest organisms, cells ingesting L. micdadei showed significantly depressed production of superoxide anion (24.5 +/- 9.0 nmol/10(6) cells per 15 min versus 6.9 +/- 3.2 nmol/10(6) cells per 15 min, respectively; P = 0.002), chemotaxis (43.9 +/- 0.8 mm versus 0.9 +/- 1.3 mm of directed migration, respectively; P = 0.001) and bactericidal activity against Staphylococcus aureus (97.9% versus 37.6% of ingested organisms killed, respectively; P = 0.001). Similar degrees of inhibition could not be demonstrated when either Staphylococcus aureus or Escherichia coli was ingested by cells prior to evaluation. Inhibition of neutrophil function did not occur when phagocytosis of L. micdadei was prevented. However, inhibition occurred with heat-killed as well as with viable organisms. The inhibition of neutrophil function by ingested L. micdadei may help explain the bacterium's ability to survive intracellularly and may begin to explain the pathogenesis of this disease.

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Selected References

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