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Legionella pneumophila inhibits type I interferon signaling to avoid cell-intrinsic host cell defense.


ABSTRACT: The host type I interferon (IFN) response protects against Legionella pneumophila infections. Other bacterial pathogens inhibit type I IFN-mediated cell signaling; however, the interaction between this signaling pathway and L. pneumophila has not been well described. Here, we demonstrate that L. pneumophila inhibits the IFN-β signaling pathway but does not inhibit IFN-γ-mediated cell signaling. The addition of IFN-β to L. pneumophila-infected macrophages limited bacterial growth independently of NOS2 and reactive nitrogen species. The type IV secretion system of L. pneumophila is required to inhibit IFN-β-mediated cell signaling. Finally, we show that the inhibition of the IFN-β signaling pathway occurs downstream of STAT1 and STAT2 phosphorylation. In conclusion, our findings describe a novel host cell signaling pathway inhibited by L. pneumophila via its type IV secretion system.

SUBMITTER: Allen CNS 

PROVIDER: S-EPMC10652965 | biostudies-literature | 2023 Nov

REPOSITORIES: biostudies-literature

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<i>Legionella pneumophila</i> inhibits type I interferon signaling to avoid cell-intrinsic host cell defense.

Allen Charles N S CNS   Banks Dallas A DA   Shuster Michael M   Vogel Stefanie N SN   O'Connor Tamara J TJ   Briken Volker V  

Infection and immunity 20231016 11


The host type I interferon (IFN) response protects against <i>Legionella pneumophila</i> infections. Other bacterial pathogens inhibit type I IFN-mediated cell signaling; however, the interaction between this signaling pathway and <i>L. pneumophila</i> has not been well described. Here, we demonstrate that <i>L. pneumophila</i> inhibits the IFN-β signaling pathway but does not inhibit IFN-γ-mediated cell signaling. The addition of IFN-β to <i>L. pneumophila</i>-infected macrophages limited bacte  ...[more]

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