Lipoteichoic acid (LTA) from Staphylococcus aureus stimulates human neutrophil cytokine release by a CD14-dependent, Toll-like-receptor-independent mechanism: Autocrine role of tumor necrosis factor-α in mediating LTA-induced interleukin-8 generation

Katja Hattar, Ulrich Grandel, Alexander Moeller, Ludger Fink, Julia Iglhaut, Thomas Hartung, Siegfried Morath, Werner Seeger, Friedrich Grimminger, Ulf Sibelius

Research output: Contribution to journalArticlepeer-review

Abstract

Objective: In sepsis, Gram-positive and Gram-negative bacteria provoke similar inflammatory processes. Whereas lipopolysaccharides (LPSs) are acknowledged as the principal immunostimulatory components of Gram-negative bacteria, the effect of the Gram-positive cell wall component lipoteichoic acid (LTA) is less well characterized. In the present study, we investigated the effect of highly purified LTA from Staphylococcus aureus on cytokine generation by isolated human neutrophils. Subjects: Isolated human neutrophils from healthy volunteers. Interventions: Incubation of neutrophils with purified LTA from S. aureus in the absence or presence of interleukin (IL)-10, anti-CD14, or anti-Toll-like-receptor antibodies. Measurements: Measurement of tumor necrosis factor (TNF)-α, IL-1β, and IL-8 by enzyme-linked immunosorbent assay. Analysis of IL-8 mRNA by reverse transcriptase polymerase chain reaction. Conclusions: The LTA challenge provoked a dramatic release of cytokines, with an early appearance of TNF-α and IL-1β and a delayed liberation of IL-8. The first phase of IL-8 production was induced directly by LTA, whereas the second phase was endogenously mediated by TNF-α, as it was largely abrogated by neutralizing anti-TNF-α antibodies. In contrast, IL1-β was not involved in LTA-induced IL-8 generation. Interestingly, the late phase of IL-8 generation could also be attenuated by exogenous IL-10, probably as a consequence of its downregulatory effects on TNF-α generation. When investigating the mechanism of LTA-induced cellular activation, activity-neutralizing antibodies demonstrated that CD14 was involved in LTA-mediated neutrophil cytokine generation. Using antibodies that neutralize the activity of Toll-like receptor 2 (TLR2) or 4 (TLR4), we also show that CD14-dependent, LTA-induced neutrophil activation did not proceed via TLR2- or TLR4-mediated pathways. In conclusion, LTA is a potent activator of human neutrophil cytokine generation, with the synthesis of the chemokine IL-8 being largely dependent on TNF-α generation in an autocrine fashion. This LTA-induced effect was inhibited by IL-10, dependent on CD14, and independent of TLR 2 or 4.

Original languageEnglish (US)
Pages (from-to)835-841
Number of pages7
JournalCritical care medicine
Volume34
Issue number3
DOIs
StatePublished - Mar 2006
Externally publishedYes

Keywords

  • CD14 antigen
  • Cytokines
  • Interleukin-10
  • Lipoteichoic acid
  • Neutrophils
  • Sepsis
  • Toll-like receptors

ASJC Scopus subject areas

  • Critical Care and Intensive Care Medicine

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