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dc.creatorMarch, Catalinaes_ES
dc.creatorCano, Victoriaes_ES
dc.creatorMoranta, Davides_ES
dc.creatorLlobet, Enriquees_ES
dc.creatorPérez Gutiérrez, Caminoes_ES
dc.creatorTomás, Juan M.es_ES
dc.creatorSuárez, Teresaes_ES
dc.creatorGarmendia, Junkales_ES
dc.creatorBengoechea Alonso, José Antonioes_ES
dc.date.accessioned2018-09-06T12:20:24Z
dc.date.available2018-09-06T12:20:24Z
dc.date.issued2013
dc.identifier.issn1932-6203
dc.identifier.urihttps://hdl.handle.net/2454/30559
dc.description.abstractPhagocytosis is a key process of the immune system. The human pathogen Klebsiella pneumoniae is a well known example of a pathogen highly resistant to phagocytosis. A wealth of evidence demonstrates that the capsule polysaccharide (CPS) plays a crucial role in resistance to phagocytosis. The amoeba Dictyostelium discoideum shares with mammalian macrophages the ability to phagocytose and kill bacteria. The fact that K. pneumoniae is ubiquitous in nature and, therefore, should avoid predation by amoebae, poses the question whether K. pneumoniae employs similar means to counteract amoebae and mammalian phagocytes. Here we developed an assay to evaluate K. pneumoniae-D. discoideum interaction. The richness of the growth medium affected the threshold at which the cps mutant was permissive for Dictyostelium and only at lower nutrient concentrations the cps mutant was susceptible to predation by amoebae. Given the critical role of bacterial surface elements on host-pathogen interactions, we explored the possible contribution of the lipopolysaccharide (LPS) and outer membrane proteins (OMPs) to combat phagoyctosis by D. discoideum. We uncover that, in addition to the CPS, the LPS O-polysaccharide and the first core sugar participate in Klebsiella resistance to predation by D. discoideum. K. pneumoniae LPS lipid A decorations are also necessary to avoid predation by amoebae although PagP-dependent palmitoylation plays a more important role than the lipid A modification with aminoarabinose. Mutants lacking OMPs OmpA or OmpK36 were also permissive for D. discoideium growth. Except the LPS O-polysaccharide mutants, all mutants were more susceptible to phagocytosis by mouse alveolar macrophages. Finally, we found a correlation between virulence, using the pneumonia mouse model, and resistance to phagocytosis. Altogether, this work reveals novel K. pneumoniae determinants involved in resistance to phagocytosis and supports the notion that Dictyostelium amoebae might be useful as host model to measure K. pneumoniae virulence and not only phagocytosis.en
dc.description.sponsorshipPart of this work was supported by Ministerio de Economía y Competitividad (Spain) and from Generalitat de Catalunya (Centre de Referencia en Biotecnologia) grants to J.M.T.; by grants from Biomedicine Program (SAF2009-07885; Ministerio de Economía y Competitividad) and SEPAR (Sociedad Española de Neumología, project reference 068/2011) to J.A.B. The laboratory of Microbial Pathogenesis is supported by a grant to Competitive groups (project reference 46/2011) from Govern Illes Balears (co-funded by European Regional Development Fund).en
dc.format.mimetypeapplication/pdfen
dc.format.mimetypeapplication/zipen
dc.language.isoengen
dc.publisherPublic Library of Scienceen
dc.relation.ispartofPlos One, 8(2): e56847en
dc.rights© 2013 March et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.en
dc.rights.urihttps://creativecommons.org/licenses/by/3.0/
dc.subjectPhagocytosisen
dc.subjectKlebsiella pneumoniaeen
dc.subjectDictyostelium discoideumen
dc.subjectBacterial surface structuresen
dc.titleRole of bacterial surface structures on the interaction of Klebsiella pneumoniae with phagocytesen
dc.typeinfo:eu-repo/semantics/articleen
dc.typeArtículo / Artikuluaes
dc.contributor.departmentUniversidad Pública de Navarra. Instituto de Agrobiotecnologíaes_ES
dc.contributor.departmentNafarroako Unibertsitate Publikoa. Agrobioteknologiako Institutuaeu
dc.rights.accessRightsinfo:eu-repo/semantics/openAccessen
dc.rights.accessRightsAcceso abierto / Sarbide irekiaes
dc.identifier.doi10.1371/journal.pone.0056847
dc.relation.publisherversionhttps://doi.org/10.1371/journal.pone.0056847
dc.type.versioninfo:eu-repo/semantics/publishedVersionen
dc.type.versionVersión publicada / Argitaratu den bertsioaes


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© 2013 March et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits
unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Except where otherwise noted, this item's license is described as © 2013 March et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.