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Legionella pneumophila Infection in Intratracheally Inoculated T Cell-Depleted or -Nondepleted A/J Mice¹

Milorad Susa^2,*, Brigita Ticac, Tomislav Rukavina, Miljenko Doric and Reinhard Marre^*

^* Department of Medical Microbiology and Hygiene, University of Ulm, Ulm, Germany; and Department of Microbiology, University of Rijeka, Rijeka, Croatia

The inflammatory response and influence of T cell depletion on the pathogenesis of an experimental Legionella infection were studied. A/J mice were infected with 10⁶ CFU of Legionella pneumophila intratracheally. With this dose all infected animals survived the infection and bacteria were cleared from lung, spleen, liver, and kidney within 10 to 11 days, leaving no residual changes in the affected organs. Inflammatory cells were recruited into the lung on the second day of infection, reaching a maximum on the third day and filling out predominantly the interstitial areas. During the first 3 days after inoculation, mainly macrophages, B cells, NK cells, and large mononuclear cells of an unknown phenotype were attracted into the lung interstitium, whereas T lymphocytes infiltrated subsequently. During the early phase of infection, serum concentrations of IFN-, TNF-, IL-1ß, IL-4, and IL-6 but not IL-2 increased dramatically. The cytokine secretion decreased on the third day after infection although bacteria were still present in the lung or even disseminated in different organs. Successful clearance of bacteria from the lung was not observed before recruitment of T cells into the lung. In mice depleted of both CD4⁺ and CD8⁺ T cells, control of infection was impaired and lethality of infection increased. Depletion of either subset left residual antibacterial mechanisms, which, however, were not sufficient to clear the Legionella as rapidly as in undepleted mice.

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