Microbial co-infection alters macrophage polarization, phagosomal escape, and microbial killing

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dc.contributor.authorTrivedi, Nikita H.
dc.contributor.authorYu, Jieh-Juen
dc.contributor.authorHung, Chiung-Yu
dc.contributor.authorDoelger, Richard P.
dc.contributor.authorNavara, Christopher S.
dc.contributor.authorArmitige, Lisa Y.
dc.contributor.authorSeshu, Janakiram
dc.contributor.authorSinai, Anthony P.
dc.contributor.authorChambers, James P.
dc.contributor.authorGuentzel, M. Neal
dc.contributor.authorArulanandam, Bernard P.
dc.date.accessioned2023-06-14T18:44:05Z
dc.date.available2023-06-14T18:44:05Z
dc.date.issued2018-02-26
dc.description.abstractMacrophages are important innate immune cells that respond to microbial insults. In response to multi-bacterial infection, the macrophage activation state may change upon exposure to nascent mediators, which results in different bacterial killing mechanism(s). In this study, we utilized two respiratory bacterial pathogens, Mycobacterium bovis (Bacillus Calmette Guẻrin, BCG) and Francisella tularensis live vaccine strain (LVS) with different phagocyte evasion mechanisms, as model microbes to assess the influence of initial bacterial infection on the macrophage response to secondary infection. Non-activated (M0) macrophages or activated M2-polarized cells (J774 cells transfected with the mouse IL-4 gene) were first infected with BCG for 24–48 h, subsequently challenged with LVS, and the results of inhibition of LVS replication in the macrophages was assessed. BCG infection in M0 macrophages activated TLR2-MyD88 and Mincle-CARD9 signaling pathways, stimulating nitric oxide (NO) production and enhanced killing of LVS. BCG infection had little effect on LVS escape from phagosomes into the cytosol in M0 macrophages. In contrast, M2-polarized macrophages exhibited enhanced endosomal acidification, as well as inhibiting LVS replication. Pre-infection with BCG did not induce NO production and thus did not further reduce LVS replication. This study provides a model for studies of the complexity of macrophage activation in response to multi-bacterial infection.en_US
dc.description.departmentMolecular Microbiology and Immunologyen_US
dc.description.sponsorshipArmy Research Office of the Department of Defense; Jane and Roland Blumberg Professorship in Biologyen_US
dc.identifier.citationTrivedi, N. H., Yu, J.-J., Hung, C.-Y., Doelger, R. P., Navara, C. S., Armitige, L. Y., . . . Arulanandam, B. P. (2018). Microbial co-infection alters macrophage polarization, phagosomal escape, and microbial killing. Innate Immunity, 24(3), 152-162. doi:10.1177/1753425918760180en_US
dc.identifier.issn1753-4267
dc.identifier.otherhttps://doi.org/10.1177/1753425918760180
dc.identifier.urihttps://hdl.handle.net/20.500.12588/1880
dc.language.isoen_USen_US
dc.publisherSAGE Publicationsen_US
dc.rightsAttribution-NonCommercial 3.0 United States*
dc.rights.urihttp://creativecommons.org/licenses/by-nc/3.0/us/*
dc.subjectFrancisellaen_US
dc.subjectBCGen_US
dc.subjectco-infectionen_US
dc.subjectmacrophageen_US
dc.subjectIL-4en_US
dc.titleMicrobial co-infection alters macrophage polarization, phagosomal escape, and microbial killingen_US
dc.typeArticleen_US

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