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Seminars in Immunopathology

Erschienen in:

01.09.2007 | Review

TLR5 and Ipaf: dual sensors of bacterial flagellin in the innate immune system

verfasst von: Edward A. Miao, Erica Andersen-Nissen, Sarah E. Warren, Alan Aderem

Erschienen in: Seminars in Immunopathology | Ausgabe 3/2007

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Abstract

The innate immune system precisely modulates the intensity of immune activation in response to infection. Flagellin is a microbe-associated molecular pattern that is present on both pathogenic and nonpathogenic bacteria. Macrophages and dendritic cells are able to determine the virulence of flagellated bacteria by sensing whether flagellin remains outside the mammalian cell, or if it gains access to the cytosol. Extracellular flagellin is detected by TLR5, which induces expression of proinflammatory cytokines, while flagellin within the cytosol of macrophages is detected through the Nod-like receptor (NLR) Ipaf, which activates caspase-1. In macrophages infected with Salmonella typhimurium or Legionella pneumophila, Ipaf becomes activated in response to flagellin that appears to be delivered to the cytosol via specific virulence factor transport systems (the SPI1 type III secretion system (T3SS) and the Dot/Icm type IV secretion system (T4SS), respectively). Thus, TLR5 responds more generally to flagellated bacteria, while Ipaf responds to bacteria that express both flagellin and virulence factors.

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Titel: TLR5 and Ipaf: dual sensors of bacterial flagellin in the innate immune system
verfasst von: Edward A. Miao
Erica Andersen-Nissen
Sarah E. Warren
Alan Aderem
Publikationsdatum: 01.09.2007
Verlag: Springer-Verlag
Erschienen in: Seminars in Immunopathology / Ausgabe 3/2007
Print ISSN: 1863-2297
Elektronische ISSN: 1863-2300
DOI: https://doi.org/10.1007/s00281-007-0078-z

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