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Related Experiment Videos

Interleukin-10 is upregulated in LPS tolerance

M Frankenberger1, H Pechumer, H W Ziegler-Heitbrock

  • 1Institute for Immunology, University of Munich, Germany.

Journal of Inflammation
|January 1, 1995
PubMed
Summary

Lipopolysaccharide (LPS) tolerance in Mono Mac 6 cells involves orchestrated cytokine regulation. Interferon-gamma (IFN-gamma) reverses tolerance, restoring tumor necrosis factor (TNF) production while reducing interleukin-10 (IL-10).

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Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Lipopolysaccharide (LPS) stimulates pro-inflammatory tumor necrosis factor (TNF) and anti-inflammatory interleukin-10 (IL-10) in Mono Mac 6 cells.
  • LPS preculture induces tolerance, characterized by minimal TNF and increased IL-10 expression upon re-stimulation.

Purpose of the Study:

  • To investigate the regulatory mechanisms underlying LPS tolerance in Mono Mac 6 cells.
  • To determine the roles of TNF and IL-10 in LPS tolerance.
  • To explore the potential of interferon-gamma (IFN-gamma) in modulating LPS tolerance.

Main Methods:

  • Stimulation of Mono Mac 6 cells with LPS.
  • Preculture of cells with low-dose LPS.
  • Treatment with neutralizing antibodies against TNF and IL-10.
  • Preculture with LPS and IFN-gamma.
  • Analysis of TNF and IL-10 mRNA and protein expression.

Main Results:

  • LPS tolerance involves reciprocal regulation of TNF and IL-10, but not solely explained by their direct interaction.
  • Neutralizing antibodies against TNF and IL-10 did not prevent the observed tolerance patterns.
  • IFN-gamma treatment during LPS preculture reversed tolerance, leading to high TNF and attenuated IL-10 expression upon subsequent stimulation.
  • LPS tolerance is an orchestrated response, not a passive downregulation of monocyte functions.

Conclusions:

  • LPS tolerance in Mono Mac 6 cells is a complex, orchestrated process involving differential regulation of pro- and anti-inflammatory cytokines.
  • IFN-gamma can effectively reverse LPS-induced tolerance by modulating TNF and IL-10 responses.
  • Understanding these mechanisms is crucial for developing targeted immunomodulatory therapies.

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