Multiplication of different Legionella species in Mono Mac 6 cells and in Acanthamoeba castellanii

Article Abstract:

The intracellular multiplication of various Legionella species in Mono Mac 6 cells, which express phenotypic and functional features of mature monocytes, and in Acanthamoeba castellanii, an environmental host of Legionella spp, was investigated. Correlation between the degree of intracellular replication in Mono Mac 6 cells and the reported clinical prevalence of a given Legionella species could be shown. The results were contrasted with the ability of these Legionella strains to multiply within A. castellanii. Multiplication of members of the genus Legionella in A. castellanii appears to be partially dependent on mechanisms different from those in monocytes.

Legionella pneumophila

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Effects of grazing by the free-living soil amoebae Acanthamoeba castellanii, Acanthamoeba polyphaga, and Hartmannella vermiformis on various bacteria

Article Abstract:

The food preferences of Acanthamoeba castellani, Acanthamoeba polyphaga and Hartmanella vermiformis in monoxenic cultures were investigated using 10 different bacteria as food source. The results showed that the amoebae preferred nonpigmented enterobacteria as food source, and food preferrence could be correlated to net ammonia production and amoebal growth yield. Bacterial grazing by amoeba can improve the mineralization of nitrogen from soil matter by stimulating the turnover of bacterial biomass.

Soil microbiology, Food chains (Ecology), Food chains

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Influence of Acanthamoeba castellanii on intracellular growth of different Legionella species in human monocytes

Article Abstract:

Acanthamoeba castellanii can increase the replication of Legionella spp. in human monocytes. Legionella growth in protozoa can also induce phenotypic modulation and increase the organism's resistance to disinfectants and antibiotics.

Infection, Monocytes, Legionella

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