Dissection of a Type I Interferon Pathway in Controlling Bacterial Intracellular Infection in Mice

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Department of Microbiology Papers
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Cell Anatomy
Microbiology
Pathogenic Microbiology
Virology
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Lippmann, Juliane
Müller, Holger
Naujoks, Jan
Tabeling, Christoph
Witzenrath, Martin
Hellwig, Katharina
Kirschning, Carsten J
Taylor, Gregory A
Barchet, Winfried
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Abstract

Defense mechanisms against intracellular bacterial pathogens are incompletely understood. Our study characterizes a type I IFN-dependent cell-autonomous defense pathway directed against Legionella pneumophila, an intracellular model organism and frequent cause of pneumonia. We show that macrophages infected with L. pneumophila produced IFNβ in a STING- and IRF3- dependent manner. Paracrine type I IFNs stimulated up-regulation of IFN-stimulated genes and a cell-autonomous defense pathway acting on replicating and non-replicating Legionella within their specialized vacuole. Our infection experiments in mice lacking receptors for type I and/or II IFNs show that type I IFNs contribute to expression of IFN-stimulated genes and to bacterial clearance as well as resistance in L. pneumophila pneumonia in addition to type II IFN. Overall, our study shows that paracrine type I IFNs mediate defense against L. pneumophila, and demonstrates a protective role of type I IFNs in in vivo infections with intracellular bacteria.

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2011-11-01
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Cellular Microbiology
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At the time of publication, author Sunny Shin was affiliated with Yale University School of Medicine. Currently, she is a faculty member at the Department of Microbiology at the University of Pennsylvania.
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