The role of lipopolysaccharide moieties in macrophage response to Escherichia coli.

Abstract:

:Lipopolysaccharide (LPS) is the main component of Gram-negative bacteria that - upon infection - activates the host immune system and is crucial in fighting pathogens as well as in the induction of sepsis. In the present study we addressed the question whether the key structural components of LPS equally take part in the activation of different macrophage immune responses. By genomic modifications of Escherichia coli MG1655, we constructed a series of strains harboring complete and truncated forms of LPS in their cell wall. These strains were exposed to RAW 264.7 macrophages, after which phagocytosis, fast release of pre-synthesized TNF and activation of NF-kappaB signal transduction pathway were quantified. According to our results the core and lipid A moieties are involved in immune recognition. The most ancient part, lipid A is crucial in evoking immediate TNF release and activation of NF-kappaB. The O-antigen inhibits phagocytosis, leading to immune evasion.

authors

Eder K,Vizler C,Kusz E,Karcagi I,Glavinas H,Balogh GE,Vigh L,Duda E,Gyorfy Z

doi

10.1016/j.bbrc.2009.08.082

subject

Has Abstract

pub_date

2009-11-06 00:00:00

pages

46-51

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(09)01662-3

journal_volume

389

pub_type

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