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.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Eder K,Vizler C,Kusz E,Karcagi I,Glavinas H,Balogh GE,Vigh L,Duda E,Gyorfy Zdoi
10.1016/j.bbrc.2009.08.082subject
Has Abstractpub_date
2009-11-06 00:00:00pages
46-51issue
1eissn
0006-291Xissn
1090-2104pii
S0006-291X(09)01662-3journal_volume
389pub_type
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