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Open AccessArticle

Mitigation of Expression of Virulence Genes in Legionella pneumophila Internalized in the Free-Living Amoeba Willaertia magna C2c Maky

1
R&D Department, Amoéba, 69680 Chassieu, France
2
Lyon Neuroscience Research Center CRNL UMR5292 U1028, University of Lyon, Univ Lyon 1, CNRS, Inserm, 69500 Bron, France
*
Author to whom correspondence should be addressed.
Pathogens 2020, 9(6), 447; https://doi.org/10.3390/pathogens9060447
Received: 14 May 2020 / Revised: 29 May 2020 / Accepted: 3 June 2020 / Published: 5 June 2020
(This article belongs to the Special Issue Legionella Contamination in Water Environment)
Legionella pneumophila is a human pathogen responsible for a severe form of pneumonia named Legionnaire disease. Its natural habitat is aquatic environments, being in a free state or intracellular parasites of free-living amoebae, such as Acanthamoeba castellanii. This pathogen is able to replicate within some amoebae. Willaertia magna C2c Maky, a non-pathogenic amoeba, was previously demonstrated to resist to L. pneumophila and even to be able to eliminate the L. pneumophila strains Philadelphia, Lens, and Paris. Here, we studied the induction of seven virulence genes of three L. pneumophila strains (Paris, Philadelphia, and Lens) within W. magna C2c Maky in comparison within A. castellanii and with the gene expression level of L. pneumophila strains alone used as controls. We defined a gene expression-based virulence index to compare easily and without bias the transcript levels in different conditions and demonstrated that W. magna C2c Maky did not increase the virulence of L. pneumophila strains in contrast to A. castellanii. These results confirmed the non-permissiveness of W. magna C2c Maky toward L. pneumophila strains. View Full-Text
Keywords: free-living amoebae (FLA); Legionella pneumophila; virulence genes; Willaertia magna C2c Maky free-living amoebae (FLA); Legionella pneumophila; virulence genes; Willaertia magna C2c Maky
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Mameri, R.M.; Bodennec, J.; Bezin, L.; Demanèche, S. Mitigation of Expression of Virulence Genes in Legionella pneumophila Internalized in the Free-Living Amoeba Willaertia magna C2c Maky. Pathogens 2020, 9, 447.

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