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Related Experiment Videos

Molecular mechanisms responsible for endotoxin tolerance

B Yoza1, K LaRue, C McCall

  • 1Bowman Gray School of Medicine of Wake Forest University Winston-Salem, NC 27157-1042, USA.

Progress in Clinical and Biological Research
|May 12, 1998
PubMed
Summary

LPS tolerance protects against lethal sepsis by repressing inflammatory genes like IL-1 beta. This involves labile repressor proteins and stimulus-specific mechanisms, potentially regulated by NF-kappa B and AP-1.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cellular Biology

Background:

  • Bacterial lipopolysaccharide endotoxin (LPS) triggers inflammatory responses, including interleukin-1 (IL-1) and tumor necrosis factor alpha (TNF alpha), key mediators of severe sepsis syndromes (SS).
  • Leukocytes, such as macrophages and neutrophils, are primary targets of LPS and can develop LPS tolerance, a protective mechanism against lethal sepsis in animal models.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying LPS tolerance in severe sepsis.
  • To compare LPS tolerance in a human severe sepsis model using blood leukocytes and an in vitro model using the THP-1 cell line.

Main Methods:

  • Analysis of IL-1 beta mRNA and Type 2 IL-1 receptor mRNA/protein expression in leukocytes from SS patients.
  • Investigation of IL-1 beta gene expression regulation in THP-1 cells following LPS exposure.
  • Assessment of stimulus-specificity and the role of transcription factors NF-kappa B and AP-1.

Main Results:

  • LPS tolerance in SS leukocytes involves IL-1 beta mRNA repression, controlled by a labile repressor protein, with increased Type 2 IL-1 receptor expression.
  • In the THP-1 model, LPS tolerance also features IL-1 beta gene expression repression at the transcriptional level, mediated by a labile protein.
  • LPS tolerance was found to be stimulus-specific in both models.

Conclusions:

  • LPS tolerance is a complex, stimulus-specific phenomenon involving transcriptional and post-transcriptional regulatory mechanisms.
  • Labile repressor proteins play a critical role in suppressing inflammatory gene expression during LPS tolerance.
  • Transcription factors like NF-kappa B and AP-1 are implicated in the regulation of LPS tolerance, offering potential therapeutic targets for sepsis.

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