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. 1987 Feb;55(2):433–437. doi: 10.1128/iai.55.2.433-437.1987

Induction of tumor necrosis factor by Legionella pneumophila.

D K Blanchard, J Y Djeu, T W Klein, H Friedman, W E Stewart 2nd
PMCID: PMC260346  PMID: 2433220

Abstract

Mice were inoculated with Legionella pneumophila via an intratracheal route to establish an experimental model of infection. Lung lavage fluid obtained from infected mice contained a cytolytic factor identified as tumor necrosis factor (TNF). Peak levels of TNF were produced at about 24 h postinfection and rapidly declined thereafter. Treatment of the mice with dextran sulfate before inoculation with the bacteria resulted in lowered amounts of TNF in the lung lavage fluid, suggesting that macrophages were responsible for production of the cytokine. Furthermore, cultures of adherent lung leukocytes and a macrophage cell line, PU 5-1.8, were stimulated to produce TNF by exposure to Legionella antigens. In addition, adherent lung leukocytes from Legionella-infected mice spontaneously released TNF into the culture supernatant. Inoculation of mice with saline or latex particles failed to induce TNF in vivo, indicating that bacterial antigens or products were the stimulating signals. Since there was no detectable TNF activity in sera at any time after intratracheal inoculation, TNF production appeared to be confined to the site of infection. Pretreatment of PU 5-1.8 cultures with gamma interferon, which was detected in the lung lavage fluid before TNF, resulted in augmented TNF production, suggesting cooperativity may exist between the two cytokines, either in the pathogenicity of the bacterium or in a possible immunomodulatory function of TNF and interferon during infection.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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