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  4. Type 1 piliated uropathogenic Escherichia coli hijack the host immune response by binding to CD14
 
research article

Type 1 piliated uropathogenic Escherichia coli hijack the host immune response by binding to CD14

Tomasek, Kathrin  
•
Leithner, Alexander
•
Glatzova, Ivana
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July 26, 2022
Elife

A key attribute of persistent or recurring bacterial infections is the ability of the pathogen to evade the host's immune response. Many Enterobacteriaceae express type 1 pili, a pre-adapted virulence trait, to invade host epithelial cells and establish persistent infections. However, the molecular mechanisms and strategies by which bacteria actively circumvent the immune response of the host remain poorly understood. Here, we identified CD14, the major co-receptor for lipopolysaccharide detection, on mouse dendritic cells (DCs) as a binding partner of FimH, the protein located at the tip of the type 1 pilus of Escherichia coli. The FimH amino acids involved in CD14 binding are highly conserved across pathogenic and non-pathogenic strains. Binding of the pathogenic strain CFT073 to CD14 reduced DC migration by overactivation of integrins and blunted expression of co-stimulatory molecules by overactivating the NFAT (nuclear factor of activated T-cells) pathway, both rate-limiting factors of T cell activation. This response was binary at the single-cell level, but averaged in larger populations exposed to both piliated and non-piliated pathogens, presumably via the exchange of immunomodulatory cytokines. While defining an active molecular mechanism of immune evasion by pathogens, the interaction between FimH and CD14 represents a potential target to interfere with persistent and recurrent infections, such as urinary tract infections or Crohn's disease.

  • Details
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Type
research article
DOI
10.7554/eLife.78995
Web of Science ID

WOS:000838410200001

Author(s)
Tomasek, Kathrin  
Leithner, Alexander
Glatzova, Ivana
Lukesch, Michael S.
Guet, Calin C.
Sixt, Michael
Zanoni, Ivan
Date Issued

2022-07-26

Publisher

eLIFE SCIENCES PUBL LTD

Published in
Elife
Volume

11

Article Number

e78995

Subjects

Biology

•

Life Sciences & Biomedicine - Other Topics

•

microbe

•

pathogenesis

•

immunity

•

e

•

coli

•

mouse

•

intestinal epithelial barrier

•

dendritic cells

•

phase variation

•

positive selection

•

crystal-structure

•

structural basis

•

fimh adhesin

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e. coli

•

genes

•

activation

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
UPKIN  
Available on Infoscience
August 29, 2022
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/190381
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